Remove LLVM 8.0.1 files.

1 files changed, 0 insertions, 16868 deletions

diff --git a/gnu/llvm/tools/clang/lib/Sema/SemaExpr.cpp b/gnu/llvm/tools/clang/lib/Sema/SemaExpr.cpp
deleted file mode 100644
index ff9393a56b9..00000000000
--- a/gnu/llvm/tools/clang/lib/Sema/SemaExpr.cpp
+++ /dev/null
@@ -1,16868 +0,0 @@
-//===--- SemaExpr.cpp - Semantic Analysis for Expressions -----------------===//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-//
-//  This file implements semantic analysis for expressions.
-//
-//===----------------------------------------------------------------------===//
-
-#include "TreeTransform.h"
-#include "clang/AST/ASTConsumer.h"
-#include "clang/AST/ASTContext.h"
-#include "clang/AST/ASTLambda.h"
-#include "clang/AST/ASTMutationListener.h"
-#include "clang/AST/CXXInheritance.h"
-#include "clang/AST/DeclObjC.h"
-#include "clang/AST/DeclTemplate.h"
-#include "clang/AST/EvaluatedExprVisitor.h"
-#include "clang/AST/Expr.h"
-#include "clang/AST/ExprCXX.h"
-#include "clang/AST/ExprObjC.h"
-#include "clang/AST/ExprOpenMP.h"
-#include "clang/AST/RecursiveASTVisitor.h"
-#include "clang/AST/TypeLoc.h"
-#include "clang/Basic/FixedPoint.h"
-#include "clang/Basic/PartialDiagnostic.h"
-#include "clang/Basic/SourceManager.h"
-#include "clang/Basic/TargetInfo.h"
-#include "clang/Lex/LiteralSupport.h"
-#include "clang/Lex/Preprocessor.h"
-#include "clang/Sema/AnalysisBasedWarnings.h"
-#include "clang/Sema/DeclSpec.h"
-#include "clang/Sema/DelayedDiagnostic.h"
-#include "clang/Sema/Designator.h"
-#include "clang/Sema/Initialization.h"
-#include "clang/Sema/Lookup.h"
-#include "clang/Sema/Overload.h"
-#include "clang/Sema/ParsedTemplate.h"
-#include "clang/Sema/Scope.h"
-#include "clang/Sema/ScopeInfo.h"
-#include "clang/Sema/SemaFixItUtils.h"
-#include "clang/Sema/SemaInternal.h"
-#include "clang/Sema/Template.h"
-#include "llvm/Support/ConvertUTF.h"
-using namespace clang;
-using namespace sema;
-
-/// Determine whether the use of this declaration is valid, without
-/// emitting diagnostics.
-bool Sema::CanUseDecl(NamedDecl *D, bool TreatUnavailableAsInvalid) {
-  // See if this is an auto-typed variable whose initializer we are parsing.
-  if (ParsingInitForAutoVars.count(D))
-    return false;
-
-  // See if this is a deleted function.
-  if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
-    if (FD->isDeleted())
-      return false;
-
-    // If the function has a deduced return type, and we can't deduce it,
-    // then we can't use it either.
-    if (getLangOpts().CPlusPlus14 && FD->getReturnType()->isUndeducedType() &&
-        DeduceReturnType(FD, SourceLocation(), /*Diagnose*/ false))
-      return false;
-
-    // See if this is an aligned allocation/deallocation function that is
-    // unavailable.
-    if (TreatUnavailableAsInvalid &&
-        isUnavailableAlignedAllocationFunction(*FD))
-      return false;
-  }
-
-  // See if this function is unavailable.
-  if (TreatUnavailableAsInvalid && D->getAvailability() == AR_Unavailable &&
-      cast<Decl>(CurContext)->getAvailability() != AR_Unavailable)
-    return false;
-
-  return true;
-}
-
-static void DiagnoseUnusedOfDecl(Sema &S, NamedDecl *D, SourceLocation Loc) {
-  // Warn if this is used but marked unused.
-  if (const auto *A = D->getAttr<UnusedAttr>()) {
-    // [[maybe_unused]] should not diagnose uses, but __attribute__((unused))
-    // should diagnose them.
-    if (A->getSemanticSpelling() != UnusedAttr::CXX11_maybe_unused &&
-        A->getSemanticSpelling() != UnusedAttr::C2x_maybe_unused) {
-      const Decl *DC = cast_or_null<Decl>(S.getCurObjCLexicalContext());
-      if (DC && !DC->hasAttr<UnusedAttr>())
-        S.Diag(Loc, diag::warn_used_but_marked_unused) << D->getDeclName();
-    }
-  }
-}
-
-/// Emit a note explaining that this function is deleted.
-void Sema::NoteDeletedFunction(FunctionDecl *Decl) {
-  assert(Decl->isDeleted());
-
-  CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(Decl);
-
-  if (Method && Method->isDeleted() && Method->isDefaulted()) {
-    // If the method was explicitly defaulted, point at that declaration.
-    if (!Method->isImplicit())
-      Diag(Decl->getLocation(), diag::note_implicitly_deleted);
-
-    // Try to diagnose why this special member function was implicitly
-    // deleted. This might fail, if that reason no longer applies.
-    CXXSpecialMember CSM = getSpecialMember(Method);
-    if (CSM != CXXInvalid)
-      ShouldDeleteSpecialMember(Method, CSM, nullptr, /*Diagnose=*/true);
-
-    return;
-  }
-
-  auto *Ctor = dyn_cast<CXXConstructorDecl>(Decl);
-  if (Ctor && Ctor->isInheritingConstructor())
-    return NoteDeletedInheritingConstructor(Ctor);
-
-  Diag(Decl->getLocation(), diag::note_availability_specified_here)
-    << Decl << 1;
-}
-
-/// Determine whether a FunctionDecl was ever declared with an
-/// explicit storage class.
-static bool hasAnyExplicitStorageClass(const FunctionDecl *D) {
-  for (auto I : D->redecls()) {
-    if (I->getStorageClass() != SC_None)
-      return true;
-  }
-  return false;
-}
-
-/// Check whether we're in an extern inline function and referring to a
-/// variable or function with internal linkage (C11 6.7.4p3).
-///
-/// This is only a warning because we used to silently accept this code, but
-/// in many cases it will not behave correctly. This is not enabled in C++ mode
-/// because the restriction language is a bit weaker (C++11 [basic.def.odr]p6)
-/// and so while there may still be user mistakes, most of the time we can't
-/// prove that there are errors.
-static void diagnoseUseOfInternalDeclInInlineFunction(Sema &S,
-                                                      const NamedDecl *D,
-                                                      SourceLocation Loc) {
-  // This is disabled under C++; there are too many ways for this to fire in
-  // contexts where the warning is a false positive, or where it is technically
-  // correct but benign.
-  if (S.getLangOpts().CPlusPlus)
-    return;
-
-  // Check if this is an inlined function or method.
-  FunctionDecl *Current = S.getCurFunctionDecl();
-  if (!Current)
-    return;
-  if (!Current->isInlined())
-    return;
-  if (!Current->isExternallyVisible())
-    return;
-
-  // Check if the decl has internal linkage.
-  if (D->getFormalLinkage() != InternalLinkage)
-    return;
-
-  // Downgrade from ExtWarn to Extension if
-  //  (1) the supposedly external inline function is in the main file,
-  //      and probably won't be included anywhere else.
-  //  (2) the thing we're referencing is a pure function.
-  //  (3) the thing we're referencing is another inline function.
-  // This last can give us false negatives, but it's better than warning on
-  // wrappers for simple C library functions.
-  const FunctionDecl *UsedFn = dyn_cast<FunctionDecl>(D);
-  bool DowngradeWarning = S.getSourceManager().isInMainFile(Loc);
-  if (!DowngradeWarning && UsedFn)
-    DowngradeWarning = UsedFn->isInlined() || UsedFn->hasAttr<ConstAttr>();
-
-  S.Diag(Loc, DowngradeWarning ? diag::ext_internal_in_extern_inline_quiet
-                               : diag::ext_internal_in_extern_inline)
-    << /*IsVar=*/!UsedFn << D;
-
-  S.MaybeSuggestAddingStaticToDecl(Current);
-
-  S.Diag(D->getCanonicalDecl()->getLocation(), diag::note_entity_declared_at)
-      << D;
-}
-
-void Sema::MaybeSuggestAddingStaticToDecl(const FunctionDecl *Cur) {
-  const FunctionDecl *First = Cur->getFirstDecl();
-
-  // Suggest "static" on the function, if possible.
-  if (!hasAnyExplicitStorageClass(First)) {
-    SourceLocation DeclBegin = First->getSourceRange().getBegin();
-    Diag(DeclBegin, diag::note_convert_inline_to_static)
-      << Cur << FixItHint::CreateInsertion(DeclBegin, "static ");
-  }
-}
-
-/// Determine whether the use of this declaration is valid, and
-/// emit any corresponding diagnostics.
-///
-/// This routine diagnoses various problems with referencing
-/// declarations that can occur when using a declaration. For example,
-/// it might warn if a deprecated or unavailable declaration is being
-/// used, or produce an error (and return true) if a C++0x deleted
-/// function is being used.
-///
-/// \returns true if there was an error (this declaration cannot be
-/// referenced), false otherwise.
-///
-bool Sema::DiagnoseUseOfDecl(NamedDecl *D, ArrayRef<SourceLocation> Locs,
-                             const ObjCInterfaceDecl *UnknownObjCClass,
-                             bool ObjCPropertyAccess,
-                             bool AvoidPartialAvailabilityChecks,
-                             ObjCInterfaceDecl *ClassReceiver) {
-  SourceLocation Loc = Locs.front();
-  if (getLangOpts().CPlusPlus && isa<FunctionDecl>(D)) {
-    // If there were any diagnostics suppressed by template argument deduction,
-    // emit them now.
-    auto Pos = SuppressedDiagnostics.find(D->getCanonicalDecl());
-    if (Pos != SuppressedDiagnostics.end()) {
-      for (const PartialDiagnosticAt &Suppressed : Pos->second)
-        Diag(Suppressed.first, Suppressed.second);
-
-      // Clear out the list of suppressed diagnostics, so that we don't emit
-      // them again for this specialization. However, we don't obsolete this
-      // entry from the table, because we want to avoid ever emitting these
-      // diagnostics again.
-      Pos->second.clear();
-    }
-
-    // C++ [basic.start.main]p3:
-    //   The function 'main' shall not be used within a program.
-    if (cast<FunctionDecl>(D)->isMain())
-      Diag(Loc, diag::ext_main_used);
-
-    diagnoseUnavailableAlignedAllocation(*cast<FunctionDecl>(D), Loc);
-  }
-
-  // See if this is an auto-typed variable whose initializer we are parsing.
-  if (ParsingInitForAutoVars.count(D)) {
-    if (isa<BindingDecl>(D)) {
-      Diag(Loc, diag::err_binding_cannot_appear_in_own_initializer)
-        << D->getDeclName();
-    } else {
-      Diag(Loc, diag::err_auto_variable_cannot_appear_in_own_initializer)
-        << D->getDeclName() << cast<VarDecl>(D)->getType();
-    }
-    return true;
-  }
-
-  // See if this is a deleted function.
-  if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
-    if (FD->isDeleted()) {
-      auto *Ctor = dyn_cast<CXXConstructorDecl>(FD);
-      if (Ctor && Ctor->isInheritingConstructor())
-        Diag(Loc, diag::err_deleted_inherited_ctor_use)
-            << Ctor->getParent()
-            << Ctor->getInheritedConstructor().getConstructor()->getParent();
-      else
-        Diag(Loc, diag::err_deleted_function_use);
-      NoteDeletedFunction(FD);
-      return true;
-    }
-
-    // If the function has a deduced return type, and we can't deduce it,
-    // then we can't use it either.
-    if (getLangOpts().CPlusPlus14 && FD->getReturnType()->isUndeducedType() &&
-        DeduceReturnType(FD, Loc))
-      return true;
-
-    if (getLangOpts().CUDA && !CheckCUDACall(Loc, FD))
-      return true;
-  }
-
-  if (auto *MD = dyn_cast<CXXMethodDecl>(D)) {
-    // Lambdas are only default-constructible or assignable in C++2a onwards.
-    if (MD->getParent()->isLambda() &&
-        ((isa<CXXConstructorDecl>(MD) &&
-          cast<CXXConstructorDecl>(MD)->isDefaultConstructor()) ||
-         MD->isCopyAssignmentOperator() || MD->isMoveAssignmentOperator())) {
-      Diag(Loc, diag::warn_cxx17_compat_lambda_def_ctor_assign)
-        << !isa<CXXConstructorDecl>(MD);
-    }
-  }
-
-  auto getReferencedObjCProp = [](const NamedDecl *D) ->
-                                      const ObjCPropertyDecl * {
-    if (const auto *MD = dyn_cast<ObjCMethodDecl>(D))
-      return MD->findPropertyDecl();
-    return nullptr;
-  };
-  if (const ObjCPropertyDecl *ObjCPDecl = getReferencedObjCProp(D)) {
-    if (diagnoseArgIndependentDiagnoseIfAttrs(ObjCPDecl, Loc))
-      return true;
-  } else if (diagnoseArgIndependentDiagnoseIfAttrs(D, Loc)) {
-      return true;
-  }
-
-  // [OpenMP 4.0], 2.15 declare reduction Directive, Restrictions
-  // Only the variables omp_in and omp_out are allowed in the combiner.
-  // Only the variables omp_priv and omp_orig are allowed in the
-  // initializer-clause.
-  auto *DRD = dyn_cast<OMPDeclareReductionDecl>(CurContext);
-  if (LangOpts.OpenMP && DRD && !CurContext->containsDecl(D) &&
-      isa<VarDecl>(D)) {
-    Diag(Loc, diag::err_omp_wrong_var_in_declare_reduction)
-        << getCurFunction()->HasOMPDeclareReductionCombiner;
-    Diag(D->getLocation(), diag::note_entity_declared_at) << D;
-    return true;
-  }
-
-  DiagnoseAvailabilityOfDecl(D, Locs, UnknownObjCClass, ObjCPropertyAccess,
-                             AvoidPartialAvailabilityChecks, ClassReceiver);
-
-  DiagnoseUnusedOfDecl(*this, D, Loc);
-
-  diagnoseUseOfInternalDeclInInlineFunction(*this, D, Loc);
-
-  return false;
-}
-
-/// Retrieve the message suffix that should be added to a
-/// diagnostic complaining about the given function being deleted or
-/// unavailable.
-std::string Sema::getDeletedOrUnavailableSuffix(const FunctionDecl *FD) {
-  std::string Message;
-  if (FD->getAvailability(&Message))
-    return ": " + Message;
-
-  return std::string();
-}
-
-/// DiagnoseSentinelCalls - This routine checks whether a call or
-/// message-send is to a declaration with the sentinel attribute, and
-/// if so, it checks that the requirements of the sentinel are
-/// satisfied.
-void Sema::DiagnoseSentinelCalls(NamedDecl *D, SourceLocation Loc,
-                                 ArrayRef<Expr *> Args) {
-  const SentinelAttr *attr = D->getAttr<SentinelAttr>();
-  if (!attr)
-    return;
-
-  // The number of formal parameters of the declaration.
-  unsigned numFormalParams;
-
-  // The kind of declaration.  This is also an index into a %select in
-  // the diagnostic.
-  enum CalleeType { CT_Function, CT_Method, CT_Block } calleeType;
-
-  if (ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(D)) {
-    numFormalParams = MD->param_size();
-    calleeType = CT_Method;
-  } else if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
-    numFormalParams = FD->param_size();
-    calleeType = CT_Function;
-  } else if (isa<VarDecl>(D)) {
-    QualType type = cast<ValueDecl>(D)->getType();
-    const FunctionType *fn = nullptr;
-    if (const PointerType *ptr = type->getAs<PointerType>()) {
-      fn = ptr->getPointeeType()->getAs<FunctionType>();
-      if (!fn) return;
-      calleeType = CT_Function;
-    } else if (const BlockPointerType *ptr = type->getAs<BlockPointerType>()) {
-      fn = ptr->getPointeeType()->castAs<FunctionType>();
-      calleeType = CT_Block;
-    } else {
-      return;
-    }
-
-    if (const FunctionProtoType *proto = dyn_cast<FunctionProtoType>(fn)) {
-      numFormalParams = proto->getNumParams();
-    } else {
-      numFormalParams = 0;
-    }
-  } else {
-    return;
-  }
-
-  // "nullPos" is the number of formal parameters at the end which
-  // effectively count as part of the variadic arguments.  This is
-  // useful if you would prefer to not have *any* formal parameters,
-  // but the language forces you to have at least one.
-  unsigned nullPos = attr->getNullPos();
-  assert((nullPos == 0 || nullPos == 1) && "invalid null position on sentinel");
-  numFormalParams = (nullPos > numFormalParams ? 0 : numFormalParams - nullPos);
-
-  // The number of arguments which should follow the sentinel.
-  unsigned numArgsAfterSentinel = attr->getSentinel();
-
-  // If there aren't enough arguments for all the formal parameters,
-  // the sentinel, and the args after the sentinel, complain.
-  if (Args.size() < numFormalParams + numArgsAfterSentinel + 1) {
-    Diag(Loc, diag::warn_not_enough_argument) << D->getDeclName();
-    Diag(D->getLocation(), diag::note_sentinel_here) << int(calleeType);
-    return;
-  }
-
-  // Otherwise, find the sentinel expression.
-  Expr *sentinelExpr = Args[Args.size() - numArgsAfterSentinel - 1];
-  if (!sentinelExpr) return;
-  if (sentinelExpr->isValueDependent()) return;
-  if (Context.isSentinelNullExpr(sentinelExpr)) return;
-
-  // Pick a reasonable string to insert.  Optimistically use 'nil', 'nullptr',
-  // or 'NULL' if those are actually defined in the context.  Only use
-  // 'nil' for ObjC methods, where it's much more likely that the
-  // variadic arguments form a list of object pointers.
-  SourceLocation MissingNilLoc = getLocForEndOfToken(sentinelExpr->getEndLoc());
-  std::string NullValue;
-  if (calleeType == CT_Method && PP.isMacroDefined("nil"))
-    NullValue = "nil";
-  else if (getLangOpts().CPlusPlus11)
-    NullValue = "nullptr";
-  else if (PP.isMacroDefined("NULL"))
-    NullValue = "NULL";
-  else
-    NullValue = "(void*) 0";
-
-  if (MissingNilLoc.isInvalid())
-    Diag(Loc, diag::warn_missing_sentinel) << int(calleeType);
-  else
-    Diag(MissingNilLoc, diag::warn_missing_sentinel)
-      << int(calleeType)
-      << FixItHint::CreateInsertion(MissingNilLoc, ", " + NullValue);
-  Diag(D->getLocation(), diag::note_sentinel_here) << int(calleeType);
-}
-
-SourceRange Sema::getExprRange(Expr *E) const {
-  return E ? E->getSourceRange() : SourceRange();
-}
-
-//===----------------------------------------------------------------------===//
-//  Standard Promotions and Conversions
-//===----------------------------------------------------------------------===//
-
-/// DefaultFunctionArrayConversion (C99 6.3.2.1p3, C99 6.3.2.1p4).
-ExprResult Sema::DefaultFunctionArrayConversion(Expr *E, bool Diagnose) {
-  // Handle any placeholder expressions which made it here.
-  if (E->getType()->isPlaceholderType()) {
-    ExprResult result = CheckPlaceholderExpr(E);
-    if (result.isInvalid()) return ExprError();
-    E = result.get();
-  }
-
-  QualType Ty = E->getType();
-  assert(!Ty.isNull() && "DefaultFunctionArrayConversion - missing type");
-
-  if (Ty->isFunctionType()) {
-    if (auto *DRE = dyn_cast<DeclRefExpr>(E->IgnoreParenCasts()))
-      if (auto *FD = dyn_cast<FunctionDecl>(DRE->getDecl()))
-        if (!checkAddressOfFunctionIsAvailable(FD, Diagnose, E->getExprLoc()))
-          return ExprError();
-
-    E = ImpCastExprToType(E, Context.getPointerType(Ty),
-                          CK_FunctionToPointerDecay).get();
-  } else if (Ty->isArrayType()) {
-    // In C90 mode, arrays only promote to pointers if the array expression is
-    // an lvalue.  The relevant legalese is C90 6.2.2.1p3: "an lvalue that has
-    // type 'array of type' is converted to an expression that has type 'pointer
-    // to type'...".  In C99 this was changed to: C99 6.3.2.1p3: "an expression
-    // that has type 'array of type' ...".  The relevant change is "an lvalue"
-    // (C90) to "an expression" (C99).
-    //
-    // C++ 4.2p1:
-    // An lvalue or rvalue of type "array of N T" or "array of unknown bound of
-    // T" can be converted to an rvalue of type "pointer to T".
-    //
-    if (getLangOpts().C99 || getLangOpts().CPlusPlus || E->isLValue())
-      E = ImpCastExprToType(E, Context.getArrayDecayedType(Ty),
-                            CK_ArrayToPointerDecay).get();
-  }
-  return E;
-}
-
-static void CheckForNullPointerDereference(Sema &S, Expr *E) {
-  // Check to see if we are dereferencing a null pointer.  If so,
-  // and if not volatile-qualified, this is undefined behavior that the
-  // optimizer will delete, so warn about it.  People sometimes try to use this
-  // to get a deterministic trap and are surprised by clang's behavior.  This
-  // only handles the pattern "*null", which is a very syntactic check.
-  if (UnaryOperator *UO = dyn_cast<UnaryOperator>(E->IgnoreParenCasts()))
-    if (UO->getOpcode() == UO_Deref &&
-        UO->getSubExpr()->IgnoreParenCasts()->
-          isNullPointerConstant(S.Context, Expr::NPC_ValueDependentIsNotNull) &&
-        !UO->getType().isVolatileQualified()) {
-    S.DiagRuntimeBehavior(UO->getOperatorLoc(), UO,
-                          S.PDiag(diag::warn_indirection_through_null)
-                            << UO->getSubExpr()->getSourceRange());
-    S.DiagRuntimeBehavior(UO->getOperatorLoc(), UO,
-                        S.PDiag(diag::note_indirection_through_null));
-  }
-}
-
-static void DiagnoseDirectIsaAccess(Sema &S, const ObjCIvarRefExpr *OIRE,
-                                    SourceLocation AssignLoc,
-                                    const Expr* RHS) {
-  const ObjCIvarDecl *IV = OIRE->getDecl();
-  if (!IV)
-    return;
-
-  DeclarationName MemberName = IV->getDeclName();
-  IdentifierInfo *Member = MemberName.getAsIdentifierInfo();
-  if (!Member || !Member->isStr("isa"))
-    return;
-
-  const Expr *Base = OIRE->getBase();
-  QualType BaseType = Base->getType();
-  if (OIRE->isArrow())
-    BaseType = BaseType->getPointeeType();
-  if (const ObjCObjectType *OTy = BaseType->getAs<ObjCObjectType>())
-    if (ObjCInterfaceDecl *IDecl = OTy->getInterface()) {
-      ObjCInterfaceDecl *ClassDeclared = nullptr;
-      ObjCIvarDecl *IV = IDecl->lookupInstanceVariable(Member, ClassDeclared);
-      if (!ClassDeclared->getSuperClass()
-          && (*ClassDeclared->ivar_begin()) == IV) {
-        if (RHS) {
-          NamedDecl *ObjectSetClass =
-            S.LookupSingleName(S.TUScope,
-                               &S.Context.Idents.get("object_setClass"),
-                               SourceLocation(), S.LookupOrdinaryName);
-          if (ObjectSetClass) {
-            SourceLocation RHSLocEnd = S.getLocForEndOfToken(RHS->getEndLoc());
-            S.Diag(OIRE->getExprLoc(), diag::warn_objc_isa_assign)
-                << FixItHint::CreateInsertion(OIRE->getBeginLoc(),
-                                              "object_setClass(")
-                << FixItHint::CreateReplacement(
-                       SourceRange(OIRE->getOpLoc(), AssignLoc), ",")
-                << FixItHint::CreateInsertion(RHSLocEnd, ")");
-          }
-          else
-            S.Diag(OIRE->getLocation(), diag::warn_objc_isa_assign);
-        } else {
-          NamedDecl *ObjectGetClass =
-            S.LookupSingleName(S.TUScope,
-                               &S.Context.Idents.get("object_getClass"),
-                               SourceLocation(), S.LookupOrdinaryName);
-          if (ObjectGetClass)
-            S.Diag(OIRE->getExprLoc(), diag::warn_objc_isa_use)
-                << FixItHint::CreateInsertion(OIRE->getBeginLoc(),
-                                              "object_getClass(")
-                << FixItHint::CreateReplacement(
-                       SourceRange(OIRE->getOpLoc(), OIRE->getEndLoc()), ")");
-          else
-            S.Diag(OIRE->getLocation(), diag::warn_objc_isa_use);
-        }
-        S.Diag(IV->getLocation(), diag::note_ivar_decl);
-      }
-    }
-}
-
-ExprResult Sema::DefaultLvalueConversion(Expr *E) {
-  // Handle any placeholder expressions which made it here.
-  if (E->getType()->isPlaceholderType()) {
-    ExprResult result = CheckPlaceholderExpr(E);
-    if (result.isInvalid()) return ExprError();
-    E = result.get();
-  }
-
-  // C++ [conv.lval]p1:
-  //   A glvalue of a non-function, non-array type T can be
-  //   converted to a prvalue.
-  if (!E->isGLValue()) return E;
-
-  QualType T = E->getType();
-  assert(!T.isNull() && "r-value conversion on typeless expression?");
-
-  // We don't want to throw lvalue-to-rvalue casts on top of
-  // expressions of certain types in C++.
-  if (getLangOpts().CPlusPlus &&
-      (E->getType() == Context.OverloadTy ||
-       T->isDependentType() ||
-       T->isRecordType()))
-    return E;
-
-  // The C standard is actually really unclear on this point, and
-  // DR106 tells us what the result should be but not why.  It's
-  // generally best to say that void types just doesn't undergo
-  // lvalue-to-rvalue at all.  Note that expressions of unqualified
-  // 'void' type are never l-values, but qualified void can be.
-  if (T->isVoidType())
-    return E;
-
-  // OpenCL usually rejects direct accesses to values of 'half' type.
-  if (getLangOpts().OpenCL && !getOpenCLOptions().isEnabled("cl_khr_fp16") &&
-      T->isHalfType()) {
-    Diag(E->getExprLoc(), diag::err_opencl_half_load_store)
-      << 0 << T;
-    return ExprError();
-  }
-
-  CheckForNullPointerDereference(*this, E);
-  if (const ObjCIsaExpr *OISA = dyn_cast<ObjCIsaExpr>(E->IgnoreParenCasts())) {
-    NamedDecl *ObjectGetClass = LookupSingleName(TUScope,
-                                     &Context.Idents.get("object_getClass"),
-                                     SourceLocation(), LookupOrdinaryName);
-    if (ObjectGetClass)
-      Diag(E->getExprLoc(), diag::warn_objc_isa_use)
-          << FixItHint::CreateInsertion(OISA->getBeginLoc(), "object_getClass(")
-          << FixItHint::CreateReplacement(
-                 SourceRange(OISA->getOpLoc(), OISA->getIsaMemberLoc()), ")");
-    else
-      Diag(E->getExprLoc(), diag::warn_objc_isa_use);
-  }
-  else if (const ObjCIvarRefExpr *OIRE =
-            dyn_cast<ObjCIvarRefExpr>(E->IgnoreParenCasts()))
-    DiagnoseDirectIsaAccess(*this, OIRE, SourceLocation(), /* Expr*/nullptr);
-
-  // C++ [conv.lval]p1:
-  //   [...] If T is a non-class type, the type of the prvalue is the
-  //   cv-unqualified version of T. Otherwise, the type of the
-  //   rvalue is T.
-  //
-  // C99 6.3.2.1p2:
-  //   If the lvalue has qualified type, the value has the unqualified
-  //   version of the type of the lvalue; otherwise, the value has the
-  //   type of the lvalue.
-  if (T.hasQualifiers())
-    T = T.getUnqualifiedType();
-
-  // Under the MS ABI, lock down the inheritance model now.
-  if (T->isMemberPointerType() &&
-      Context.getTargetInfo().getCXXABI().isMicrosoft())
-    (void)isCompleteType(E->getExprLoc(), T);
-
-  UpdateMarkingForLValueToRValue(E);
-
-  // Loading a __weak object implicitly retains the value, so we need a cleanup to
-  // balance that.
-  if (E->getType().getObjCLifetime() == Qualifiers::OCL_Weak)
-    Cleanup.setExprNeedsCleanups(true);
-
-  ExprResult Res = ImplicitCastExpr::Create(Context, T, CK_LValueToRValue, E,
-                                            nullptr, VK_RValue);
-
-  // C11 6.3.2.1p2:
-  //   ... if the lvalue has atomic type, the value has the non-atomic version
-  //   of the type of the lvalue ...
-  if (const AtomicType *Atomic = T->getAs<AtomicType>()) {
-    T = Atomic->getValueType().getUnqualifiedType();
-    Res = ImplicitCastExpr::Create(Context, T, CK_AtomicToNonAtomic, Res.get(),
-                                   nullptr, VK_RValue);
-  }
-
-  return Res;
-}
-
-ExprResult Sema::DefaultFunctionArrayLvalueConversion(Expr *E, bool Diagnose) {
-  ExprResult Res = DefaultFunctionArrayConversion(E, Diagnose);
-  if (Res.isInvalid())
-    return ExprError();
-  Res = DefaultLvalueConversion(Res.get());
-  if (Res.isInvalid())
-    return ExprError();
-  return Res;
-}
-
-/// CallExprUnaryConversions - a special case of an unary conversion
-/// performed on a function designator of a call expression.
-ExprResult Sema::CallExprUnaryConversions(Expr *E) {
-  QualType Ty = E->getType();
-  ExprResult Res = E;
-  // Only do implicit cast for a function type, but not for a pointer
-  // to function type.
-  if (Ty->isFunctionType()) {
-    Res = ImpCastExprToType(E, Context.getPointerType(Ty),
-                            CK_FunctionToPointerDecay).get();
-    if (Res.isInvalid())
-      return ExprError();
-  }
-  Res = DefaultLvalueConversion(Res.get());
-  if (Res.isInvalid())
-    return ExprError();
-  return Res.get();
-}
-
-/// UsualUnaryConversions - Performs various conversions that are common to most
-/// operators (C99 6.3). The conversions of array and function types are
-/// sometimes suppressed. For example, the array->pointer conversion doesn't
-/// apply if the array is an argument to the sizeof or address (&) operators.
-/// In these instances, this routine should *not* be called.
-ExprResult Sema::UsualUnaryConversions(Expr *E) {
-  // First, convert to an r-value.
-  ExprResult Res = DefaultFunctionArrayLvalueConversion(E);
-  if (Res.isInvalid())
-    return ExprError();
-  E = Res.get();
-
-  QualType Ty = E->getType();
-  assert(!Ty.isNull() && "UsualUnaryConversions - missing type");
-
-  // Half FP have to be promoted to float unless it is natively supported
-  if (Ty->isHalfType() && !getLangOpts().NativeHalfType)
-    return ImpCastExprToType(Res.get(), Context.FloatTy, CK_FloatingCast);
-
-  // Try to perform integral promotions if the object has a theoretically
-  // promotable type.
-  if (Ty->isIntegralOrUnscopedEnumerationType()) {
-    // C99 6.3.1.1p2:
-    //
-    //   The following may be used in an expression wherever an int or
-    //   unsigned int may be used:
-    //     - an object or expression with an integer type whose integer
-    //       conversion rank is less than or equal to the rank of int
-    //       and unsigned int.
-    //     - A bit-field of type _Bool, int, signed int, or unsigned int.
-    //
-    //   If an int can represent all values of the original type, the
-    //   value is converted to an int; otherwise, it is converted to an
-    //   unsigned int. These are called the integer promotions. All
-    //   other types are unchanged by the integer promotions.
-
-    QualType PTy = Context.isPromotableBitField(E);
-    if (!PTy.isNull()) {
-      E = ImpCastExprToType(E, PTy, CK_IntegralCast).get();
-      return E;
-    }
-    if (Ty->isPromotableIntegerType()) {
-      QualType PT = Context.getPromotedIntegerType(Ty);
-      E = ImpCastExprToType(E, PT, CK_IntegralCast).get();
-      return E;
-    }
-  }
-  return E;
-}
-
-/// DefaultArgumentPromotion (C99 6.5.2.2p6). Used for function calls that
-/// do not have a prototype. Arguments that have type float or __fp16
-/// are promoted to double. All other argument types are converted by
-/// UsualUnaryConversions().
-ExprResult Sema::DefaultArgumentPromotion(Expr *E) {
-  QualType Ty = E->getType();
-  assert(!Ty.isNull() && "DefaultArgumentPromotion - missing type");
-
-  ExprResult Res = UsualUnaryConversions(E);
-  if (Res.isInvalid())
-    return ExprError();
-  E = Res.get();
-
-  // If this is a 'float'  or '__fp16' (CVR qualified or typedef)
-  // promote to double.
-  // Note that default argument promotion applies only to float (and
-  // half/fp16); it does not apply to _Float16.
-  const BuiltinType *BTy = Ty->getAs<BuiltinType>();
-  if (BTy && (BTy->getKind() == BuiltinType::Half ||
-              BTy->getKind() == BuiltinType::Float)) {
-    if (getLangOpts().OpenCL &&
-        !getOpenCLOptions().isEnabled("cl_khr_fp64")) {
-        if (BTy->getKind() == BuiltinType::Half) {
-            E = ImpCastExprToType(E, Context.FloatTy, CK_FloatingCast).get();
-        }
-    } else {
-      E = ImpCastExprToType(E, Context.DoubleTy, CK_FloatingCast).get();
-    }
-  }
-
-  // C++ performs lvalue-to-rvalue conversion as a default argument
-  // promotion, even on class types, but note:
-  //   C++11 [conv.lval]p2:
-  //     When an lvalue-to-rvalue conversion occurs in an unevaluated
-  //     operand or a subexpression thereof the value contained in the
-  //     referenced object is not accessed. Otherwise, if the glvalue
-  //     has a class type, the conversion copy-initializes a temporary
-  //     of type T from the glvalue and the result of the conversion
-  //     is a prvalue for the temporary.
-  // FIXME: add some way to gate this entire thing for correctness in
-  // potentially potentially evaluated contexts.
-  if (getLangOpts().CPlusPlus && E->isGLValue() && !isUnevaluatedContext()) {
-    ExprResult Temp = PerformCopyInitialization(
-                       InitializedEntity::InitializeTemporary(E->getType()),
-                                                E->getExprLoc(), E);
-    if (Temp.isInvalid())
-      return ExprError();
-    E = Temp.get();
-  }
-
-  return E;
-}
-
-/// Determine the degree of POD-ness for an expression.
-/// Incomplete types are considered POD, since this check can be performed
-/// when we're in an unevaluated context.
-Sema::VarArgKind Sema::isValidVarArgType(const QualType &Ty) {
-  if (Ty->isIncompleteType()) {
-    // C++11 [expr.call]p7:
-    //   After these conversions, if the argument does not have arithmetic,
-    //   enumeration, pointer, pointer to member, or class type, the program
-    //   is ill-formed.
-    //
-    // Since we've already performed array-to-pointer and function-to-pointer
-    // decay, the only such type in C++ is cv void. This also handles
-    // initializer lists as variadic arguments.
-    if (Ty->isVoidType())
-      return VAK_Invalid;
-
-    if (Ty->isObjCObjectType())
-      return VAK_Invalid;
-    return VAK_Valid;
-  }
-
-  if (Ty.isDestructedType() == QualType::DK_nontrivial_c_struct)
-    return VAK_Invalid;
-
-  if (Ty.isCXX98PODType(Context))
-    return VAK_Valid;
-
-  // C++11 [expr.call]p7:
-  //   Passing a potentially-evaluated argument of class type (Clause 9)
-  //   having a non-trivial copy constructor, a non-trivial move constructor,
-  //   or a non-trivial destructor, with no corresponding parameter,
-  //   is conditionally-supported with implementation-defined semantics.
-  if (getLangOpts().CPlusPlus11 && !Ty->isDependentType())
-    if (CXXRecordDecl *Record = Ty->getAsCXXRecordDecl())
-      if (!Record->hasNonTrivialCopyConstructor() &&
-          !Record->hasNonTrivialMoveConstructor() &&
-          !Record->hasNonTrivialDestructor())
-        return VAK_ValidInCXX11;
-
-  if (getLangOpts().ObjCAutoRefCount && Ty->isObjCLifetimeType())
-    return VAK_Valid;
-
-  if (Ty->isObjCObjectType())
-    return VAK_Invalid;
-
-  if (getLangOpts().MSVCCompat)
-    return VAK_MSVCUndefined;
-
-  // FIXME: In C++11, these cases are conditionally-supported, meaning we're
-  // permitted to reject them. We should consider doing so.
-  return VAK_Undefined;
-}
-
-void Sema::checkVariadicArgument(const Expr *E, VariadicCallType CT) {
-  // Don't allow one to pass an Objective-C interface to a vararg.
-  const QualType &Ty = E->getType();
-  VarArgKind VAK = isValidVarArgType(Ty);
-
-  // Complain about passing non-POD types through varargs.
-  switch (VAK) {
-  case VAK_ValidInCXX11:
-    DiagRuntimeBehavior(
-        E->getBeginLoc(), nullptr,
-        PDiag(diag::warn_cxx98_compat_pass_non_pod_arg_to_vararg) << Ty << CT);
-    LLVM_FALLTHROUGH;
-  case VAK_Valid:
-    if (Ty->isRecordType()) {
-      // This is unlikely to be what the user intended. If the class has a
-      // 'c_str' member function, the user probably meant to call that.
-      DiagRuntimeBehavior(E->getBeginLoc(), nullptr,
-                          PDiag(diag::warn_pass_class_arg_to_vararg)
-                              << Ty << CT << hasCStrMethod(E) << ".c_str()");
-    }
-    break;
-
-  case VAK_Undefined:
-  case VAK_MSVCUndefined:
-    DiagRuntimeBehavior(E->getBeginLoc(), nullptr,
-                        PDiag(diag::warn_cannot_pass_non_pod_arg_to_vararg)
-                            << getLangOpts().CPlusPlus11 << Ty << CT);
-    break;
-
-  case VAK_Invalid:
-    if (Ty.isDestructedType() == QualType::DK_nontrivial_c_struct)
-      Diag(E->getBeginLoc(),
-           diag::err_cannot_pass_non_trivial_c_struct_to_vararg)
-          << Ty << CT;
-    else if (Ty->isObjCObjectType())
-      DiagRuntimeBehavior(E->getBeginLoc(), nullptr,
-                          PDiag(diag::err_cannot_pass_objc_interface_to_vararg)
-                              << Ty << CT);
-    else
-      Diag(E->getBeginLoc(), diag::err_cannot_pass_to_vararg)
-          << isa<InitListExpr>(E) << Ty << CT;
-    break;
-  }
-}
-
-/// DefaultVariadicArgumentPromotion - Like DefaultArgumentPromotion, but
-/// will create a trap if the resulting type is not a POD type.
-ExprResult Sema::DefaultVariadicArgumentPromotion(Expr *E, VariadicCallType CT,
-                                                  FunctionDecl *FDecl) {
-  if (const BuiltinType *PlaceholderTy = E->getType()->getAsPlaceholderType()) {
-    // Strip the unbridged-cast placeholder expression off, if applicable.
-    if (PlaceholderTy->getKind() == BuiltinType::ARCUnbridgedCast &&
-        (CT == VariadicMethod ||
-         (FDecl && FDecl->hasAttr<CFAuditedTransferAttr>()))) {
-      E = stripARCUnbridgedCast(E);
-
-    // Otherwise, do normal placeholder checking.
-    } else {
-      ExprResult ExprRes = CheckPlaceholderExpr(E);
-      if (ExprRes.isInvalid())
-        return ExprError();
-      E = ExprRes.get();
-    }
-  }
-
-  ExprResult ExprRes = DefaultArgumentPromotion(E);
-  if (ExprRes.isInvalid())
-    return ExprError();
-  E = ExprRes.get();
-
-  // Diagnostics regarding non-POD argument types are
-  // emitted along with format string checking in Sema::CheckFunctionCall().
-  if (isValidVarArgType(E->getType()) == VAK_Undefined) {
-    // Turn this into a trap.
-    CXXScopeSpec SS;
-    SourceLocation TemplateKWLoc;
-    UnqualifiedId Name;
-    Name.setIdentifier(PP.getIdentifierInfo("__builtin_trap"),
-                       E->getBeginLoc());
-    ExprResult TrapFn = ActOnIdExpression(TUScope, SS, TemplateKWLoc,
-                                          Name, true, false);
-    if (TrapFn.isInvalid())
-      return ExprError();
-
-    ExprResult Call = ActOnCallExpr(TUScope, TrapFn.get(), E->getBeginLoc(),
-                                    None, E->getEndLoc());
-    if (Call.isInvalid())
-      return ExprError();
-
-    ExprResult Comma =
-        ActOnBinOp(TUScope, E->getBeginLoc(), tok::comma, Call.get(), E);
-    if (Comma.isInvalid())
-      return ExprError();
-    return Comma.get();
-  }
-
-  if (!getLangOpts().CPlusPlus &&
-      RequireCompleteType(E->getExprLoc(), E->getType(),
-                          diag::err_call_incomplete_argument))
-    return ExprError();
-
-  return E;
-}
-
-/// Converts an integer to complex float type.  Helper function of
-/// UsualArithmeticConversions()
-///
-/// \return false if the integer expression is an integer type and is
-/// successfully converted to the complex type.
-static bool handleIntegerToComplexFloatConversion(Sema &S, ExprResult &IntExpr,
-                                                  ExprResult &ComplexExpr,
-                                                  QualType IntTy,
-                                                  QualType ComplexTy,
-                                                  bool SkipCast) {
-  if (IntTy->isComplexType() || IntTy->isRealFloatingType()) return true;
-  if (SkipCast) return false;
-  if (IntTy->isIntegerType()) {
-    QualType fpTy = cast<ComplexType>(ComplexTy)->getElementType();
-    IntExpr = S.ImpCastExprToType(IntExpr.get(), fpTy, CK_IntegralToFloating);
-    IntExpr = S.ImpCastExprToType(IntExpr.get(), ComplexTy,
-                                  CK_FloatingRealToComplex);
-  } else {
-    assert(IntTy->isComplexIntegerType());
-    IntExpr = S.ImpCastExprToType(IntExpr.get(), ComplexTy,
-                                  CK_IntegralComplexToFloatingComplex);
-  }
-  return false;
-}
-
-/// Handle arithmetic conversion with complex types.  Helper function of
-/// UsualArithmeticConversions()
-static QualType handleComplexFloatConversion(Sema &S, ExprResult &LHS,
-                                             ExprResult &RHS, QualType LHSType,
-                                             QualType RHSType,
-                                             bool IsCompAssign) {
-  // if we have an integer operand, the result is the complex type.
-  if (!handleIntegerToComplexFloatConversion(S, RHS, LHS, RHSType, LHSType,
-                                             /*skipCast*/false))
-    return LHSType;
-  if (!handleIntegerToComplexFloatConversion(S, LHS, RHS, LHSType, RHSType,
-                                             /*skipCast*/IsCompAssign))
-    return RHSType;
-
-  // This handles complex/complex, complex/float, or float/complex.
-  // When both operands are complex, the shorter operand is converted to the
-  // type of the longer, and that is the type of the result. This corresponds
-  // to what is done when combining two real floating-point operands.
-  // The fun begins when size promotion occur across type domains.
-  // From H&S 6.3.4: When one operand is complex and the other is a real
-  // floating-point type, the less precise type is converted, within it's
-  // real or complex domain, to the precision of the other type. For example,
-  // when combining a "long double" with a "double _Complex", the
-  // "double _Complex" is promoted to "long double _Complex".
-
-  // Compute the rank of the two types, regardless of whether they are complex.
-  int Order = S.Context.getFloatingTypeOrder(LHSType, RHSType);
-
-  auto *LHSComplexType = dyn_cast<ComplexType>(LHSType);
-  auto *RHSComplexType = dyn_cast<ComplexType>(RHSType);
-  QualType LHSElementType =
-      LHSComplexType ? LHSComplexType->getElementType() : LHSType;
-  QualType RHSElementType =
-      RHSComplexType ? RHSComplexType->getElementType() : RHSType;
-
-  QualType ResultType = S.Context.getComplexType(LHSElementType);
-  if (Order < 0) {
-    // Promote the precision of the LHS if not an assignment.
-    ResultType = S.Context.getComplexType(RHSElementType);
-    if (!IsCompAssign) {
-      if (LHSComplexType)
-        LHS =
-            S.ImpCastExprToType(LHS.get(), ResultType, CK_FloatingComplexCast);
-      else
-        LHS = S.ImpCastExprToType(LHS.get(), RHSElementType, CK_FloatingCast);
-    }
-  } else if (Order > 0) {
-    // Promote the precision of the RHS.
-    if (RHSComplexType)
-      RHS = S.ImpCastExprToType(RHS.get(), ResultType, CK_FloatingComplexCast);
-    else
-      RHS = S.ImpCastExprToType(RHS.get(), LHSElementType, CK_FloatingCast);
-  }
-  return ResultType;
-}
-
-/// Handle arithmetic conversion from integer to float.  Helper function
-/// of UsualArithmeticConversions()
-static QualType handleIntToFloatConversion(Sema &S, ExprResult &FloatExpr,
-                                           ExprResult &IntExpr,
-                                           QualType FloatTy, QualType IntTy,
-                                           bool ConvertFloat, bool ConvertInt) {
-  if (IntTy->isIntegerType()) {
-    if (ConvertInt)
-      // Convert intExpr to the lhs floating point type.
-      IntExpr = S.ImpCastExprToType(IntExpr.get(), FloatTy,
-                                    CK_IntegralToFloating);
-    return FloatTy;
-  }
-
-  // Convert both sides to the appropriate complex float.
-  assert(IntTy->isComplexIntegerType());
-  QualType result = S.Context.getComplexType(FloatTy);
-
-  // _Complex int -> _Complex float
-  if (ConvertInt)
-    IntExpr = S.ImpCastExprToType(IntExpr.get(), result,
-                                  CK_IntegralComplexToFloatingComplex);
-
-  // float -> _Complex float
-  if (ConvertFloat)
-    FloatExpr = S.ImpCastExprToType(FloatExpr.get(), result,
-                                    CK_FloatingRealToComplex);
-
-  return result;
-}
-
-/// Handle arithmethic conversion with floating point types.  Helper
-/// function of UsualArithmeticConversions()
-static QualType handleFloatConversion(Sema &S, ExprResult &LHS,
-                                      ExprResult &RHS, QualType LHSType,
-                                      QualType RHSType, bool IsCompAssign) {
-  bool LHSFloat = LHSType->isRealFloatingType();
-  bool RHSFloat = RHSType->isRealFloatingType();
-
-  // If we have two real floating types, convert the smaller operand
-  // to the bigger result.
-  if (LHSFloat && RHSFloat) {
-    int order = S.Context.getFloatingTypeOrder(LHSType, RHSType);
-    if (order > 0) {
-      RHS = S.ImpCastExprToType(RHS.get(), LHSType, CK_FloatingCast);
-      return LHSType;
-    }
-
-    assert(order < 0 && "illegal float comparison");
-    if (!IsCompAssign)
-      LHS = S.ImpCastExprToType(LHS.get(), RHSType, CK_FloatingCast);
-    return RHSType;
-  }
-
-  if (LHSFloat) {
-    // Half FP has to be promoted to float unless it is natively supported
-    if (LHSType->isHalfType() && !S.getLangOpts().NativeHalfType)
-      LHSType = S.Context.FloatTy;
-
-    return handleIntToFloatConversion(S, LHS, RHS, LHSType, RHSType,
-                                      /*convertFloat=*/!IsCompAssign,
-                                      /*convertInt=*/ true);
-  }
-  assert(RHSFloat);
-  return handleIntToFloatConversion(S, RHS, LHS, RHSType, LHSType,
-                                    /*convertInt=*/ true,
-                                    /*convertFloat=*/!IsCompAssign);
-}
-
-/// Diagnose attempts to convert between __float128 and long double if
-/// there is no support for such conversion. Helper function of
-/// UsualArithmeticConversions().
-static bool unsupportedTypeConversion(const Sema &S, QualType LHSType,
-                                      QualType RHSType) {
-  /*  No issue converting if at least one of the types is not a floating point
-      type or the two types have the same rank.
-  */
-  if (!LHSType->isFloatingType() || !RHSType->isFloatingType() ||
-      S.Context.getFloatingTypeOrder(LHSType, RHSType) == 0)
-    return false;
-
-  assert(LHSType->isFloatingType() && RHSType->isFloatingType() &&
-         "The remaining types must be floating point types.");
-
-  auto *LHSComplex = LHSType->getAs<ComplexType>();
-  auto *RHSComplex = RHSType->getAs<ComplexType>();
-
-  QualType LHSElemType = LHSComplex ?
-    LHSComplex->getElementType() : LHSType;
-  QualType RHSElemType = RHSComplex ?
-    RHSComplex->getElementType() : RHSType;
-
-  // No issue if the two types have the same representation
-  if (&S.Context.getFloatTypeSemantics(LHSElemType) ==
-      &S.Context.getFloatTypeSemantics(RHSElemType))
-    return false;
-
-  bool Float128AndLongDouble = (LHSElemType == S.Context.Float128Ty &&
-                                RHSElemType == S.Context.LongDoubleTy);
-  Float128AndLongDouble |= (LHSElemType == S.Context.LongDoubleTy &&
-                            RHSElemType == S.Context.Float128Ty);
-
-  // We've handled the situation where __float128 and long double have the same
-  // representation. We allow all conversions for all possible long double types
-  // except PPC's double double.
-  return Float128AndLongDouble &&
-    (&S.Context.getFloatTypeSemantics(S.Context.LongDoubleTy) ==
-     &llvm::APFloat::PPCDoubleDouble());
-}
-
-typedef ExprResult PerformCastFn(Sema &S, Expr *operand, QualType toType);
-
-namespace {
-/// These helper callbacks are placed in an anonymous namespace to
-/// permit their use as function template parameters.
-ExprResult doIntegralCast(Sema &S, Expr *op, QualType toType) {
-  return S.ImpCastExprToType(op, toType, CK_IntegralCast);
-}
-
-ExprResult doComplexIntegralCast(Sema &S, Expr *op, QualType toType) {
-  return S.ImpCastExprToType(op, S.Context.getComplexType(toType),
-                             CK_IntegralComplexCast);
-}
-}
-
-/// Handle integer arithmetic conversions.  Helper function of
-/// UsualArithmeticConversions()
-template <PerformCastFn doLHSCast, PerformCastFn doRHSCast>
-static QualType handleIntegerConversion(Sema &S, ExprResult &LHS,
-                                        ExprResult &RHS, QualType LHSType,
-                                        QualType RHSType, bool IsCompAssign) {
-  // The rules for this case are in C99 6.3.1.8
-  int order = S.Context.getIntegerTypeOrder(LHSType, RHSType);
-  bool LHSSigned = LHSType->hasSignedIntegerRepresentation();
-  bool RHSSigned = RHSType->hasSignedIntegerRepresentation();
-  if (LHSSigned == RHSSigned) {
-    // Same signedness; use the higher-ranked type
-    if (order >= 0) {
-      RHS = (*doRHSCast)(S, RHS.get(), LHSType);
-      return LHSType;
-    } else if (!IsCompAssign)
-      LHS = (*doLHSCast)(S, LHS.get(), RHSType);
-    return RHSType;
-  } else if (order != (LHSSigned ? 1 : -1)) {
-    // The unsigned type has greater than or equal rank to the
-    // signed type, so use the unsigned type
-    if (RHSSigned) {
-      RHS = (*doRHSCast)(S, RHS.get(), LHSType);
-      return LHSType;
-    } else if (!IsCompAssign)
-      LHS = (*doLHSCast)(S, LHS.get(), RHSType);
-    return RHSType;
-  } else if (S.Context.getIntWidth(LHSType) != S.Context.getIntWidth(RHSType)) {
-    // The two types are different widths; if we are here, that
-    // means the signed type is larger than the unsigned type, so
-    // use the signed type.
-    if (LHSSigned) {
-      RHS = (*doRHSCast)(S, RHS.get(), LHSType);
-      return LHSType;
-    } else if (!IsCompAssign)
-      LHS = (*doLHSCast)(S, LHS.get(), RHSType);
-    return RHSType;
-  } else {
-    // The signed type is higher-ranked than the unsigned type,
-    // but isn't actually any bigger (like unsigned int and long
-    // on most 32-bit systems).  Use the unsigned type corresponding
-    // to the signed type.
-    QualType result =
-      S.Context.getCorrespondingUnsignedType(LHSSigned ? LHSType : RHSType);
-    RHS = (*doRHSCast)(S, RHS.get(), result);
-    if (!IsCompAssign)
-      LHS = (*doLHSCast)(S, LHS.get(), result);
-    return result;
-  }
-}
-
-/// Handle conversions with GCC complex int extension.  Helper function
-/// of UsualArithmeticConversions()
-static QualType handleComplexIntConversion(Sema &S, ExprResult &LHS,
-                                           ExprResult &RHS, QualType LHSType,
-                                           QualType RHSType,
-                                           bool IsCompAssign) {
-  const ComplexType *LHSComplexInt = LHSType->getAsComplexIntegerType();
-  const ComplexType *RHSComplexInt = RHSType->getAsComplexIntegerType();
-
-  if (LHSComplexInt && RHSComplexInt) {
-    QualType LHSEltType = LHSComplexInt->getElementType();
-    QualType RHSEltType = RHSComplexInt->getElementType();
-    QualType ScalarType =
-      handleIntegerConversion<doComplexIntegralCast, doComplexIntegralCast>
-        (S, LHS, RHS, LHSEltType, RHSEltType, IsCompAssign);
-
-    return S.Context.getComplexType(ScalarType);
-  }
-
-  if (LHSComplexInt) {
-    QualType LHSEltType = LHSComplexInt->getElementType();
-    QualType ScalarType =
-      handleIntegerConversion<doComplexIntegralCast, doIntegralCast>
-        (S, LHS, RHS, LHSEltType, RHSType, IsCompAssign);
-    QualType ComplexType = S.Context.getComplexType(ScalarType);
-    RHS = S.ImpCastExprToType(RHS.get(), ComplexType,
-                              CK_IntegralRealToComplex);
-
-    return ComplexType;
-  }
-
-  assert(RHSComplexInt);
-
-  QualType RHSEltType = RHSComplexInt->getElementType();
-  QualType ScalarType =
-    handleIntegerConversion<doIntegralCast, doComplexIntegralCast>
-      (S, LHS, RHS, LHSType, RHSEltType, IsCompAssign);
-  QualType ComplexType = S.Context.getComplexType(ScalarType);
-
-  if (!IsCompAssign)
-    LHS = S.ImpCastExprToType(LHS.get(), ComplexType,
-                              CK_IntegralRealToComplex);
-  return ComplexType;
-}
-
-/// UsualArithmeticConversions - Performs various conversions that are common to
-/// binary operators (C99 6.3.1.8). If both operands aren't arithmetic, this
-/// routine returns the first non-arithmetic type found. The client is
-/// responsible for emitting appropriate error diagnostics.
-QualType Sema::UsualArithmeticConversions(ExprResult &LHS, ExprResult &RHS,
-                                          bool IsCompAssign) {
-  if (!IsCompAssign) {
-    LHS = UsualUnaryConversions(LHS.get());
-    if (LHS.isInvalid())
-      return QualType();
-  }
-
-  RHS = UsualUnaryConversions(RHS.get());
-  if (RHS.isInvalid())
-    return QualType();
-
-  // For conversion purposes, we ignore any qualifiers.
-  // For example, "const float" and "float" are equivalent.
-  QualType LHSType =
-    Context.getCanonicalType(LHS.get()->getType()).getUnqualifiedType();
-  QualType RHSType =
-    Context.getCanonicalType(RHS.get()->getType()).getUnqualifiedType();
-
-  // For conversion purposes, we ignore any atomic qualifier on the LHS.
-  if (const AtomicType *AtomicLHS = LHSType->getAs<AtomicType>())
-    LHSType = AtomicLHS->getValueType();
-
-  // If both types are identical, no conversion is needed.
-  if (LHSType == RHSType)
-    return LHSType;
-
-  // If either side is a non-arithmetic type (e.g. a pointer), we are done.
-  // The caller can deal with this (e.g. pointer + int).
-  if (!LHSType->isArithmeticType() || !RHSType->isArithmeticType())
-    return QualType();
-
-  // Apply unary and bitfield promotions to the LHS's type.
-  QualType LHSUnpromotedType = LHSType;
-  if (LHSType->isPromotableIntegerType())
-    LHSType = Context.getPromotedIntegerType(LHSType);
-  QualType LHSBitfieldPromoteTy = Context.isPromotableBitField(LHS.get());
-  if (!LHSBitfieldPromoteTy.isNull())
-    LHSType = LHSBitfieldPromoteTy;
-  if (LHSType != LHSUnpromotedType && !IsCompAssign)
-    LHS = ImpCastExprToType(LHS.get(), LHSType, CK_IntegralCast);
-
-  // If both types are identical, no conversion is needed.
-  if (LHSType == RHSType)
-    return LHSType;
-
-  // At this point, we have two different arithmetic types.
-
-  // Diagnose attempts to convert between __float128 and long double where
-  // such conversions currently can't be handled.
-  if (unsupportedTypeConversion(*this, LHSType, RHSType))
-    return QualType();
-
-  // Handle complex types first (C99 6.3.1.8p1).
-  if (LHSType->isComplexType() || RHSType->isComplexType())
-    return handleComplexFloatConversion(*this, LHS, RHS, LHSType, RHSType,
-                                        IsCompAssign);
-
-  // Now handle "real" floating types (i.e. float, double, long double).
-  if (LHSType->isRealFloatingType() || RHSType->isRealFloatingType())
-    return handleFloatConversion(*this, LHS, RHS, LHSType, RHSType,
-                                 IsCompAssign);
-
-  // Handle GCC complex int extension.
-  if (LHSType->isComplexIntegerType() || RHSType->isComplexIntegerType())
-    return handleComplexIntConversion(*this, LHS, RHS, LHSType, RHSType,
-                                      IsCompAssign);
-
-  // Finally, we have two differing integer types.
-  return handleIntegerConversion<doIntegralCast, doIntegralCast>
-           (*this, LHS, RHS, LHSType, RHSType, IsCompAssign);
-}
-
-
-//===----------------------------------------------------------------------===//
-//  Semantic Analysis for various Expression Types
-//===----------------------------------------------------------------------===//
-
-
-ExprResult
-Sema::ActOnGenericSelectionExpr(SourceLocation KeyLoc,
-                                SourceLocation DefaultLoc,
-                                SourceLocation RParenLoc,
-                                Expr *ControllingExpr,
-                                ArrayRef<ParsedType> ArgTypes,
-                                ArrayRef<Expr *> ArgExprs) {
-  unsigned NumAssocs = ArgTypes.size();
-  assert(NumAssocs == ArgExprs.size());
-
-  TypeSourceInfo **Types = new TypeSourceInfo*[NumAssocs];
-  for (unsigned i = 0; i < NumAssocs; ++i) {
-    if (ArgTypes[i])
-      (void) GetTypeFromParser(ArgTypes[i], &Types[i]);
-    else
-      Types[i] = nullptr;
-  }
-
-  ExprResult ER = CreateGenericSelectionExpr(KeyLoc, DefaultLoc, RParenLoc,
-                                             ControllingExpr,
-                                             llvm::makeArrayRef(Types, NumAssocs),
-                                             ArgExprs);
-  delete [] Types;
-  return ER;
-}
-
-ExprResult
-Sema::CreateGenericSelectionExpr(SourceLocation KeyLoc,
-                                 SourceLocation DefaultLoc,
-                                 SourceLocation RParenLoc,
-                                 Expr *ControllingExpr,
-                                 ArrayRef<TypeSourceInfo *> Types,
-                                 ArrayRef<Expr *> Exprs) {
-  unsigned NumAssocs = Types.size();
-  assert(NumAssocs == Exprs.size());
-
-  // Decay and strip qualifiers for the controlling expression type, and handle
-  // placeholder type replacement. See committee discussion from WG14 DR423.
-  {
-    EnterExpressionEvaluationContext Unevaluated(
-        *this, Sema::ExpressionEvaluationContext::Unevaluated);
-    ExprResult R = DefaultFunctionArrayLvalueConversion(ControllingExpr);
-    if (R.isInvalid())
-      return ExprError();
-    ControllingExpr = R.get();
-  }
-
-  // The controlling expression is an unevaluated operand, so side effects are
-  // likely unintended.
-  if (!inTemplateInstantiation() &&
-      ControllingExpr->HasSideEffects(Context, false))
-    Diag(ControllingExpr->getExprLoc(),
-         diag::warn_side_effects_unevaluated_context);
-
-  bool TypeErrorFound = false,
-       IsResultDependent = ControllingExpr->isTypeDependent(),
-       ContainsUnexpandedParameterPack
-         = ControllingExpr->containsUnexpandedParameterPack();
-
-  for (unsigned i = 0; i < NumAssocs; ++i) {
-    if (Exprs[i]->containsUnexpandedParameterPack())
-      ContainsUnexpandedParameterPack = true;
-
-    if (Types[i]) {
-      if (Types[i]->getType()->containsUnexpandedParameterPack())
-        ContainsUnexpandedParameterPack = true;
-
-      if (Types[i]->getType()->isDependentType()) {
-        IsResultDependent = true;
-      } else {
-        // C11 6.5.1.1p2 "The type name in a generic association shall specify a
-        // complete object type other than a variably modified type."
-        unsigned D = 0;
-        if (Types[i]->getType()->isIncompleteType())
-          D = diag::err_assoc_type_incomplete;
-        else if (!Types[i]->getType()->isObjectType())
-          D = diag::err_assoc_type_nonobject;
-        else if (Types[i]->getType()->isVariablyModifiedType())
-          D = diag::err_assoc_type_variably_modified;
-
-        if (D != 0) {
-          Diag(Types[i]->getTypeLoc().getBeginLoc(), D)
-            << Types[i]->getTypeLoc().getSourceRange()
-            << Types[i]->getType();
-          TypeErrorFound = true;
-        }
-
-        // C11 6.5.1.1p2 "No two generic associations in the same generic
-        // selection shall specify compatible types."
-        for (unsigned j = i+1; j < NumAssocs; ++j)
-          if (Types[j] && !Types[j]->getType()->isDependentType() &&
-              Context.typesAreCompatible(Types[i]->getType(),
-                                         Types[j]->getType())) {
-            Diag(Types[j]->getTypeLoc().getBeginLoc(),
-                 diag::err_assoc_compatible_types)
-              << Types[j]->getTypeLoc().getSourceRange()
-              << Types[j]->getType()
-              << Types[i]->getType();
-            Diag(Types[i]->getTypeLoc().getBeginLoc(),
-                 diag::note_compat_assoc)
-              << Types[i]->getTypeLoc().getSourceRange()
-              << Types[i]->getType();
-            TypeErrorFound = true;
-          }
-      }
-    }
-  }
-  if (TypeErrorFound)
-    return ExprError();
-
-  // If we determined that the generic selection is result-dependent, don't
-  // try to compute the result expression.
-  if (IsResultDependent)
-    return new (Context) GenericSelectionExpr(
-        Context, KeyLoc, ControllingExpr, Types, Exprs, DefaultLoc, RParenLoc,
-        ContainsUnexpandedParameterPack);
-
-  SmallVector<unsigned, 1> CompatIndices;
-  unsigned DefaultIndex = -1U;
-  for (unsigned i = 0; i < NumAssocs; ++i) {
-    if (!Types[i])
-      DefaultIndex = i;
-    else if (Context.typesAreCompatible(ControllingExpr->getType(),
-                                        Types[i]->getType()))
-      CompatIndices.push_back(i);
-  }
-
-  // C11 6.5.1.1p2 "The controlling expression of a generic selection shall have
-  // type compatible with at most one of the types named in its generic
-  // association list."
-  if (CompatIndices.size() > 1) {
-    // We strip parens here because the controlling expression is typically
-    // parenthesized in macro definitions.
-    ControllingExpr = ControllingExpr->IgnoreParens();
-    Diag(ControllingExpr->getBeginLoc(), diag::err_generic_sel_multi_match)
-        << ControllingExpr->getSourceRange() << ControllingExpr->getType()
-        << (unsigned)CompatIndices.size();
-    for (unsigned I : CompatIndices) {
-      Diag(Types[I]->getTypeLoc().getBeginLoc(),
-           diag::note_compat_assoc)
-        << Types[I]->getTypeLoc().getSourceRange()
-        << Types[I]->getType();
-    }
-    return ExprError();
-  }
-
-  // C11 6.5.1.1p2 "If a generic selection has no default generic association,
-  // its controlling expression shall have type compatible with exactly one of
-  // the types named in its generic association list."
-  if (DefaultIndex == -1U && CompatIndices.size() == 0) {
-    // We strip parens here because the controlling expression is typically
-    // parenthesized in macro definitions.
-    ControllingExpr = ControllingExpr->IgnoreParens();
-    Diag(ControllingExpr->getBeginLoc(), diag::err_generic_sel_no_match)
-        << ControllingExpr->getSourceRange() << ControllingExpr->getType();
-    return ExprError();
-  }
-
-  // C11 6.5.1.1p3 "If a generic selection has a generic association with a
-  // type name that is compatible with the type of the controlling expression,
-  // then the result expression of the generic selection is the expression
-  // in that generic association. Otherwise, the result expression of the
-  // generic selection is the expression in the default generic association."
-  unsigned ResultIndex =
-    CompatIndices.size() ? CompatIndices[0] : DefaultIndex;
-
-  return new (Context) GenericSelectionExpr(
-      Context, KeyLoc, ControllingExpr, Types, Exprs, DefaultLoc, RParenLoc,
-      ContainsUnexpandedParameterPack, ResultIndex);
-}
-
-/// getUDSuffixLoc - Create a SourceLocation for a ud-suffix, given the
-/// location of the token and the offset of the ud-suffix within it.
-static SourceLocation getUDSuffixLoc(Sema &S, SourceLocation TokLoc,
-                                     unsigned Offset) {
-  return Lexer::AdvanceToTokenCharacter(TokLoc, Offset, S.getSourceManager(),
-                                        S.getLangOpts());
-}
-
-/// BuildCookedLiteralOperatorCall - A user-defined literal was found. Look up
-/// the corresponding cooked (non-raw) literal operator, and build a call to it.
-static ExprResult BuildCookedLiteralOperatorCall(Sema &S, Scope *Scope,
-                                                 IdentifierInfo *UDSuffix,
-                                                 SourceLocation UDSuffixLoc,
-                                                 ArrayRef<Expr*> Args,
-                                                 SourceLocation LitEndLoc) {
-  assert(Args.size() <= 2 && "too many arguments for literal operator");
-
-  QualType ArgTy[2];
-  for (unsigned ArgIdx = 0; ArgIdx != Args.size(); ++ArgIdx) {
-    ArgTy[ArgIdx] = Args[ArgIdx]->getType();
-    if (ArgTy[ArgIdx]->isArrayType())
-      ArgTy[ArgIdx] = S.Context.getArrayDecayedType(ArgTy[ArgIdx]);
-  }
-
-  DeclarationName OpName =
-    S.Context.DeclarationNames.getCXXLiteralOperatorName(UDSuffix);
-  DeclarationNameInfo OpNameInfo(OpName, UDSuffixLoc);
-  OpNameInfo.setCXXLiteralOperatorNameLoc(UDSuffixLoc);
-
-  LookupResult R(S, OpName, UDSuffixLoc, Sema::LookupOrdinaryName);
-  if (S.LookupLiteralOperator(Scope, R, llvm::makeArrayRef(ArgTy, Args.size()),
-                              /*AllowRaw*/ false, /*AllowTemplate*/ false,
-                              /*AllowStringTemplate*/ false,
-                              /*DiagnoseMissing*/ true) == Sema::LOLR_Error)
-    return ExprError();
-
-  return S.BuildLiteralOperatorCall(R, OpNameInfo, Args, LitEndLoc);
-}
-
-/// ActOnStringLiteral - The specified tokens were lexed as pasted string
-/// fragments (e.g. "foo" "bar" L"baz").  The result string has to handle string
-/// concatenation ([C99 5.1.1.2, translation phase #6]), so it may come from
-/// multiple tokens.  However, the common case is that StringToks points to one
-/// string.
-///
-ExprResult
-Sema::ActOnStringLiteral(ArrayRef<Token> StringToks, Scope *UDLScope) {
-  assert(!StringToks.empty() && "Must have at least one string!");
-
-  StringLiteralParser Literal(StringToks, PP);
-  if (Literal.hadError)
-    return ExprError();
-
-  SmallVector<SourceLocation, 4> StringTokLocs;
-  for (const Token &Tok : StringToks)
-    StringTokLocs.push_back(Tok.getLocation());
-
-  QualType CharTy = Context.CharTy;
-  StringLiteral::StringKind Kind = StringLiteral::Ascii;
-  if (Literal.isWide()) {
-    CharTy = Context.getWideCharType();
-    Kind = StringLiteral::Wide;
-  } else if (Literal.isUTF8()) {
-    if (getLangOpts().Char8)
-      CharTy = Context.Char8Ty;
-    Kind = StringLiteral::UTF8;
-  } else if (Literal.isUTF16()) {
-    CharTy = Context.Char16Ty;
-    Kind = StringLiteral::UTF16;
-  } else if (Literal.isUTF32()) {
-    CharTy = Context.Char32Ty;
-    Kind = StringLiteral::UTF32;
-  } else if (Literal.isPascal()) {
-    CharTy = Context.UnsignedCharTy;
-  }
-
-  // Warn on initializing an array of char from a u8 string literal; this
-  // becomes ill-formed in C++2a.
-  if (getLangOpts().CPlusPlus && !getLangOpts().CPlusPlus2a &&
-      !getLangOpts().Char8 && Kind == StringLiteral::UTF8) {
-    Diag(StringTokLocs.front(), diag::warn_cxx2a_compat_utf8_string);
-
-    // Create removals for all 'u8' prefixes in the string literal(s). This
-    // ensures C++2a compatibility (but may change the program behavior when
-    // built by non-Clang compilers for which the execution character set is
-    // not always UTF-8).
-    auto RemovalDiag = PDiag(diag::note_cxx2a_compat_utf8_string_remove_u8);
-    SourceLocation RemovalDiagLoc;
-    for (const Token &Tok : StringToks) {
-      if (Tok.getKind() == tok::utf8_string_literal) {
-        if (RemovalDiagLoc.isInvalid())
-          RemovalDiagLoc = Tok.getLocation();
-        RemovalDiag << FixItHint::CreateRemoval(CharSourceRange::getCharRange(
-            Tok.getLocation(),
-            Lexer::AdvanceToTokenCharacter(Tok.getLocation(), 2,
-                                           getSourceManager(), getLangOpts())));
-      }
-    }
-    Diag(RemovalDiagLoc, RemovalDiag);
-  }
-
-
-  QualType CharTyConst = CharTy;
-  // A C++ string literal has a const-qualified element type (C++ 2.13.4p1).
-  if (getLangOpts().CPlusPlus || getLangOpts().ConstStrings)
-    CharTyConst.addConst();
-
-  CharTyConst = Context.adjustStringLiteralBaseType(CharTyConst);
-
-  // Get an array type for the string, according to C99 6.4.5.  This includes
-  // the nul terminator character as well as the string length for pascal
-  // strings.
-  QualType StrTy = Context.getConstantArrayType(
-      CharTyConst, llvm::APInt(32, Literal.GetNumStringChars() + 1),
-      ArrayType::Normal, 0);
-
-  // Pass &StringTokLocs[0], StringTokLocs.size() to factory!
-  StringLiteral *Lit = StringLiteral::Create(Context, Literal.GetString(),
-                                             Kind, Literal.Pascal, StrTy,
-                                             &StringTokLocs[0],
-                                             StringTokLocs.size());
-  if (Literal.getUDSuffix().empty())
-    return Lit;
-
-  // We're building a user-defined literal.
-  IdentifierInfo *UDSuffix = &Context.Idents.get(Literal.getUDSuffix());
-  SourceLocation UDSuffixLoc =
-    getUDSuffixLoc(*this, StringTokLocs[Literal.getUDSuffixToken()],
-                   Literal.getUDSuffixOffset());
-
-  // Make sure we're allowed user-defined literals here.
-  if (!UDLScope)
-    return ExprError(Diag(UDSuffixLoc, diag::err_invalid_string_udl));
-
-  // C++11 [lex.ext]p5: The literal L is treated as a call of the form
-  //   operator "" X (str, len)
-  QualType SizeType = Context.getSizeType();
-
-  DeclarationName OpName =
-    Context.DeclarationNames.getCXXLiteralOperatorName(UDSuffix);
-  DeclarationNameInfo OpNameInfo(OpName, UDSuffixLoc);
-  OpNameInfo.setCXXLiteralOperatorNameLoc(UDSuffixLoc);
-
-  QualType ArgTy[] = {
-    Context.getArrayDecayedType(StrTy), SizeType
-  };
-
-  LookupResult R(*this, OpName, UDSuffixLoc, LookupOrdinaryName);
-  switch (LookupLiteralOperator(UDLScope, R, ArgTy,
-                                /*AllowRaw*/ false, /*AllowTemplate*/ false,
-                                /*AllowStringTemplate*/ true,
-                                /*DiagnoseMissing*/ true)) {
-
-  case LOLR_Cooked: {
-    llvm::APInt Len(Context.getIntWidth(SizeType), Literal.GetNumStringChars());
-    IntegerLiteral *LenArg = IntegerLiteral::Create(Context, Len, SizeType,
-                                                    StringTokLocs[0]);
-    Expr *Args[] = { Lit, LenArg };
-
-    return BuildLiteralOperatorCall(R, OpNameInfo, Args, StringTokLocs.back());
-  }
-
-  case LOLR_StringTemplate: {
-    TemplateArgumentListInfo ExplicitArgs;
-
-    unsigned CharBits = Context.getIntWidth(CharTy);
-    bool CharIsUnsigned = CharTy->isUnsignedIntegerType();
-    llvm::APSInt Value(CharBits, CharIsUnsigned);
-
-    TemplateArgument TypeArg(CharTy);
-    TemplateArgumentLocInfo TypeArgInfo(Context.getTrivialTypeSourceInfo(CharTy));
-    ExplicitArgs.addArgument(TemplateArgumentLoc(TypeArg, TypeArgInfo));
-
-    for (unsigned I = 0, N = Lit->getLength(); I != N; ++I) {
-      Value = Lit->getCodeUnit(I);
-      TemplateArgument Arg(Context, Value, CharTy);
-      TemplateArgumentLocInfo ArgInfo;
-      ExplicitArgs.addArgument(TemplateArgumentLoc(Arg, ArgInfo));
-    }
-    return BuildLiteralOperatorCall(R, OpNameInfo, None, StringTokLocs.back(),
-                                    &ExplicitArgs);
-  }
-  case LOLR_Raw:
-  case LOLR_Template:
-  case LOLR_ErrorNoDiagnostic:
-    llvm_unreachable("unexpected literal operator lookup result");
-  case LOLR_Error:
-    return ExprError();
-  }
-  llvm_unreachable("unexpected literal operator lookup result");
-}
-
-ExprResult
-Sema::BuildDeclRefExpr(ValueDecl *D, QualType Ty, ExprValueKind VK,
-                       SourceLocation Loc,
-                       const CXXScopeSpec *SS) {
-  DeclarationNameInfo NameInfo(D->getDeclName(), Loc);
-  return BuildDeclRefExpr(D, Ty, VK, NameInfo, SS);
-}
-
-/// BuildDeclRefExpr - Build an expression that references a
-/// declaration that does not require a closure capture.
-ExprResult
-Sema::BuildDeclRefExpr(ValueDecl *D, QualType Ty, ExprValueKind VK,
-                       const DeclarationNameInfo &NameInfo,
-                       const CXXScopeSpec *SS, NamedDecl *FoundD,
-                       const TemplateArgumentListInfo *TemplateArgs) {
-  bool RefersToCapturedVariable =
-      isa<VarDecl>(D) &&
-      NeedToCaptureVariable(cast<VarDecl>(D), NameInfo.getLoc());
-
-  DeclRefExpr *E;
-  if (isa<VarTemplateSpecializationDecl>(D)) {
-    VarTemplateSpecializationDecl *VarSpec =
-        cast<VarTemplateSpecializationDecl>(D);
-
-    E = DeclRefExpr::Create(Context, SS ? SS->getWithLocInContext(Context)
-                                        : NestedNameSpecifierLoc(),
-                            VarSpec->getTemplateKeywordLoc(), D,
-                            RefersToCapturedVariable, NameInfo.getLoc(), Ty, VK,
-                            FoundD, TemplateArgs);
-  } else {
-    assert(!TemplateArgs && "No template arguments for non-variable"
-                            " template specialization references");
-    E = DeclRefExpr::Create(Context, SS ? SS->getWithLocInContext(Context)
-                                        : NestedNameSpecifierLoc(),
-                            SourceLocation(), D, RefersToCapturedVariable,
-                            NameInfo, Ty, VK, FoundD);
-  }
-
-  MarkDeclRefReferenced(E);
-
-  if (getLangOpts().ObjCWeak && isa<VarDecl>(D) &&
-      Ty.getObjCLifetime() == Qualifiers::OCL_Weak && !isUnevaluatedContext() &&
-      !Diags.isIgnored(diag::warn_arc_repeated_use_of_weak, E->getBeginLoc()))
-    getCurFunction()->recordUseOfWeak(E);
-
-  FieldDecl *FD = dyn_cast<FieldDecl>(D);
-  if (IndirectFieldDecl *IFD = dyn_cast<IndirectFieldDecl>(D))
-    FD = IFD->getAnonField();
-  if (FD) {
-    UnusedPrivateFields.remove(FD);
-    // Just in case we're building an illegal pointer-to-member.
-    if (FD->isBitField())
-      E->setObjectKind(OK_BitField);
-  }
-
-  // C++ [expr.prim]/8: The expression [...] is a bit-field if the identifier
-  // designates a bit-field.
-  if (auto *BD = dyn_cast<BindingDecl>(D))
-    if (auto *BE = BD->getBinding())
-      E->setObjectKind(BE->getObjectKind());
-
-  return E;
-}
-
-/// Decomposes the given name into a DeclarationNameInfo, its location, and
-/// possibly a list of template arguments.
-///
-/// If this produces template arguments, it is permitted to call
-/// DecomposeTemplateName.
-///
-/// This actually loses a lot of source location information for
-/// non-standard name kinds; we should consider preserving that in
-/// some way.
-void
-Sema::DecomposeUnqualifiedId(const UnqualifiedId &Id,
-                             TemplateArgumentListInfo &Buffer,
-                             DeclarationNameInfo &NameInfo,
-                             const TemplateArgumentListInfo *&TemplateArgs) {
-  if (Id.getKind() == UnqualifiedIdKind::IK_TemplateId) {
-    Buffer.setLAngleLoc(Id.TemplateId->LAngleLoc);
-    Buffer.setRAngleLoc(Id.TemplateId->RAngleLoc);
-
-    ASTTemplateArgsPtr TemplateArgsPtr(Id.TemplateId->getTemplateArgs(),
-                                       Id.TemplateId->NumArgs);
-    translateTemplateArguments(TemplateArgsPtr, Buffer);
-
-    TemplateName TName = Id.TemplateId->Template.get();
-    SourceLocation TNameLoc = Id.TemplateId->TemplateNameLoc;
-    NameInfo = Context.getNameForTemplate(TName, TNameLoc);
-    TemplateArgs = &Buffer;
-  } else {
-    NameInfo = GetNameFromUnqualifiedId(Id);
-    TemplateArgs = nullptr;
-  }
-}
-
-static void emitEmptyLookupTypoDiagnostic(
-    const TypoCorrection &TC, Sema &SemaRef, const CXXScopeSpec &SS,
-    DeclarationName Typo, SourceLocation TypoLoc, ArrayRef<Expr *> Args,
-    unsigned DiagnosticID, unsigned DiagnosticSuggestID) {
-  DeclContext *Ctx =
-      SS.isEmpty() ? nullptr : SemaRef.computeDeclContext(SS, false);
-  if (!TC) {
-    // Emit a special diagnostic for failed member lookups.
-    // FIXME: computing the declaration context might fail here (?)
-    if (Ctx)
-      SemaRef.Diag(TypoLoc, diag::err_no_member) << Typo << Ctx
-                                                 << SS.getRange();
-    else
-      SemaRef.Diag(TypoLoc, DiagnosticID) << Typo;
-    return;
-  }
-
-  std::string CorrectedStr = TC.getAsString(SemaRef.getLangOpts());
-  bool DroppedSpecifier =
-      TC.WillReplaceSpecifier() && Typo.getAsString() == CorrectedStr;
-  unsigned NoteID = TC.getCorrectionDeclAs<ImplicitParamDecl>()
-                        ? diag::note_implicit_param_decl
-                        : diag::note_previous_decl;
-  if (!Ctx)
-    SemaRef.diagnoseTypo(TC, SemaRef.PDiag(DiagnosticSuggestID) << Typo,
-                         SemaRef.PDiag(NoteID));
-  else
-    SemaRef.diagnoseTypo(TC, SemaRef.PDiag(diag::err_no_member_suggest)
-                                 << Typo << Ctx << DroppedSpecifier
-                                 << SS.getRange(),
-                         SemaRef.PDiag(NoteID));
-}
-
-/// Diagnose an empty lookup.
-///
-/// \return false if new lookup candidates were found
-bool
-Sema::DiagnoseEmptyLookup(Scope *S, CXXScopeSpec &SS, LookupResult &R,
-                          std::unique_ptr<CorrectionCandidateCallback> CCC,
-                          TemplateArgumentListInfo *ExplicitTemplateArgs,
-                          ArrayRef<Expr *> Args, TypoExpr **Out) {
-  DeclarationName Name = R.getLookupName();
-
-  unsigned diagnostic = diag::err_undeclared_var_use;
-  unsigned diagnostic_suggest = diag::err_undeclared_var_use_suggest;
-  if (Name.getNameKind() == DeclarationName::CXXOperatorName ||
-      Name.getNameKind() == DeclarationName::CXXLiteralOperatorName ||
-      Name.getNameKind() == DeclarationName::CXXConversionFunctionName) {
-    diagnostic = diag::err_undeclared_use;
-    diagnostic_suggest = diag::err_undeclared_use_suggest;
-  }
-
-  // If the original lookup was an unqualified lookup, fake an
-  // unqualified lookup.  This is useful when (for example) the
-  // original lookup would not have found something because it was a
-  // dependent name.
-  DeclContext *DC = SS.isEmpty() ? CurContext : nullptr;
-  while (DC) {
-    if (isa<CXXRecordDecl>(DC)) {
-      LookupQualifiedName(R, DC);
-
-      if (!R.empty()) {
-        // Don't give errors about ambiguities in this lookup.
-        R.suppressDiagnostics();
-
-        // During a default argument instantiation the CurContext points
-        // to a CXXMethodDecl; but we can't apply a this-> fixit inside a
-        // function parameter list, hence add an explicit check.
-        bool isDefaultArgument =
-            !CodeSynthesisContexts.empty() &&
-            CodeSynthesisContexts.back().Kind ==
-                CodeSynthesisContext::DefaultFunctionArgumentInstantiation;
-        CXXMethodDecl *CurMethod = dyn_cast<CXXMethodDecl>(CurContext);
-        bool isInstance = CurMethod &&
-                          CurMethod->isInstance() &&
-                          DC == CurMethod->getParent() && !isDefaultArgument;
-
-        // Give a code modification hint to insert 'this->'.
-        // TODO: fixit for inserting 'Base<T>::' in the other cases.
-        // Actually quite difficult!
-        if (getLangOpts().MSVCCompat)
-          diagnostic = diag::ext_found_via_dependent_bases_lookup;
-        if (isInstance) {
-          Diag(R.getNameLoc(), diagnostic) << Name
-            << FixItHint::CreateInsertion(R.getNameLoc(), "this->");
-          CheckCXXThisCapture(R.getNameLoc());
-        } else {
-          Diag(R.getNameLoc(), diagnostic) << Name;
-        }
-
-        // Do we really want to note all of these?
-        for (NamedDecl *D : R)
-          Diag(D->getLocation(), diag::note_dependent_var_use);
-
-        // Return true if we are inside a default argument instantiation
-        // and the found name refers to an instance member function, otherwise
-        // the function calling DiagnoseEmptyLookup will try to create an
-        // implicit member call and this is wrong for default argument.
-        if (isDefaultArgument && ((*R.begin())->isCXXInstanceMember())) {
-          Diag(R.getNameLoc(), diag::err_member_call_without_object);
-          return true;
-        }
-
-        // Tell the callee to try to recover.
-        return false;
-      }
-
-      R.clear();
-    }
-
-    // In Microsoft mode, if we are performing lookup from within a friend
-    // function definition declared at class scope then we must set
-    // DC to the lexical parent to be able to search into the parent
-    // class.
-    if (getLangOpts().MSVCCompat && isa<FunctionDecl>(DC) &&
-        cast<FunctionDecl>(DC)->getFriendObjectKind() &&
-        DC->getLexicalParent()->isRecord())
-      DC = DC->getLexicalParent();
-    else
-      DC = DC->getParent();
-  }
-
-  // We didn't find anything, so try to correct for a typo.
-  TypoCorrection Corrected;
-  if (S && Out) {
-    SourceLocation TypoLoc = R.getNameLoc();
-    assert(!ExplicitTemplateArgs &&
-           "Diagnosing an empty lookup with explicit template args!");
-    *Out = CorrectTypoDelayed(
-        R.getLookupNameInfo(), R.getLookupKind(), S, &SS, std::move(CCC),
-        [=](const TypoCorrection &TC) {
-          emitEmptyLookupTypoDiagnostic(TC, *this, SS, Name, TypoLoc, Args,
-                                        diagnostic, diagnostic_suggest);
-        },
-        nullptr, CTK_ErrorRecovery);
-    if (*Out)
-      return true;
-  } else if (S && (Corrected =
-                       CorrectTypo(R.getLookupNameInfo(), R.getLookupKind(), S,
-                                   &SS, std::move(CCC), CTK_ErrorRecovery))) {
-    std::string CorrectedStr(Corrected.getAsString(getLangOpts()));
-    bool DroppedSpecifier =
-        Corrected.WillReplaceSpecifier() && Name.getAsString() == CorrectedStr;
-    R.setLookupName(Corrected.getCorrection());
-
-    bool AcceptableWithRecovery = false;
-    bool AcceptableWithoutRecovery = false;
-    NamedDecl *ND = Corrected.getFoundDecl();
-    if (ND) {
-      if (Corrected.isOverloaded()) {
-        OverloadCandidateSet OCS(R.getNameLoc(),
-                                 OverloadCandidateSet::CSK_Normal);
-        OverloadCandidateSet::iterator Best;
-        for (NamedDecl *CD : Corrected) {
-          if (FunctionTemplateDecl *FTD =
-                   dyn_cast<FunctionTemplateDecl>(CD))
-            AddTemplateOverloadCandidate(
-                FTD, DeclAccessPair::make(FTD, AS_none), ExplicitTemplateArgs,
-                Args, OCS);
-          else if (FunctionDecl *FD = dyn_cast<FunctionDecl>(CD))
-            if (!ExplicitTemplateArgs || ExplicitTemplateArgs->size() == 0)
-              AddOverloadCandidate(FD, DeclAccessPair::make(FD, AS_none),
-                                   Args, OCS);
-        }
-        switch (OCS.BestViableFunction(*this, R.getNameLoc(), Best)) {
-        case OR_Success:
-          ND = Best->FoundDecl;
-          Corrected.setCorrectionDecl(ND);
-          break;
-        default:
-          // FIXME: Arbitrarily pick the first declaration for the note.
-          Corrected.setCorrectionDecl(ND);
-          break;
-        }
-      }
-      R.addDecl(ND);
-      if (getLangOpts().CPlusPlus && ND->isCXXClassMember()) {
-        CXXRecordDecl *Record = nullptr;
-        if (Corrected.getCorrectionSpecifier()) {
-          const Type *Ty = Corrected.getCorrectionSpecifier()->getAsType();
-          Record = Ty->getAsCXXRecordDecl();
-        }
-        if (!Record)
-          Record = cast<CXXRecordDecl>(
-              ND->getDeclContext()->getRedeclContext());
-        R.setNamingClass(Record);
-      }
-
-      auto *UnderlyingND = ND->getUnderlyingDecl();
-      AcceptableWithRecovery = isa<ValueDecl>(UnderlyingND) ||
-                               isa<FunctionTemplateDecl>(UnderlyingND);
-      // FIXME: If we ended up with a typo for a type name or
-      // Objective-C class name, we're in trouble because the parser
-      // is in the wrong place to recover. Suggest the typo
-      // correction, but don't make it a fix-it since we're not going
-      // to recover well anyway.
-      AcceptableWithoutRecovery =
-          isa<TypeDecl>(UnderlyingND) || isa<ObjCInterfaceDecl>(UnderlyingND);
-    } else {
-      // FIXME: We found a keyword. Suggest it, but don't provide a fix-it
-      // because we aren't able to recover.
-      AcceptableWithoutRecovery = true;
-    }
-
-    if (AcceptableWithRecovery || AcceptableWithoutRecovery) {
-      unsigned NoteID = Corrected.getCorrectionDeclAs<ImplicitParamDecl>()
-                            ? diag::note_implicit_param_decl
-                            : diag::note_previous_decl;
-      if (SS.isEmpty())
-        diagnoseTypo(Corrected, PDiag(diagnostic_suggest) << Name,
-                     PDiag(NoteID), AcceptableWithRecovery);
-      else
-        diagnoseTypo(Corrected, PDiag(diag::err_no_member_suggest)
-                                  << Name << computeDeclContext(SS, false)
-                                  << DroppedSpecifier << SS.getRange(),
-                     PDiag(NoteID), AcceptableWithRecovery);
-
-      // Tell the callee whether to try to recover.
-      return !AcceptableWithRecovery;
-    }
-  }
-  R.clear();
-
-  // Emit a special diagnostic for failed member lookups.
-  // FIXME: computing the declaration context might fail here (?)
-  if (!SS.isEmpty()) {
-    Diag(R.getNameLoc(), diag::err_no_member)
-      << Name << computeDeclContext(SS, false)
-      << SS.getRange();
-    return true;
-  }
-
-  // Give up, we can't recover.
-  Diag(R.getNameLoc(), diagnostic) << Name;
-  return true;
-}
-
-/// In Microsoft mode, if we are inside a template class whose parent class has
-/// dependent base classes, and we can't resolve an unqualified identifier, then
-/// assume the identifier is a member of a dependent base class.  We can only
-/// recover successfully in static methods, instance methods, and other contexts
-/// where 'this' is available.  This doesn't precisely match MSVC's
-/// instantiation model, but it's close enough.
-static Expr *
-recoverFromMSUnqualifiedLookup(Sema &S, ASTContext &Context,
-                               DeclarationNameInfo &NameInfo,
-                               SourceLocation TemplateKWLoc,
-                               const TemplateArgumentListInfo *TemplateArgs) {
-  // Only try to recover from lookup into dependent bases in static methods or
-  // contexts where 'this' is available.
-  QualType ThisType = S.getCurrentThisType();
-  const CXXRecordDecl *RD = nullptr;
-  if (!ThisType.isNull())
-    RD = ThisType->getPointeeType()->getAsCXXRecordDecl();
-  else if (auto *MD = dyn_cast<CXXMethodDecl>(S.CurContext))
-    RD = MD->getParent();
-  if (!RD || !RD->hasAnyDependentBases())
-    return nullptr;
-
-  // Diagnose this as unqualified lookup into a dependent base class.  If 'this'
-  // is available, suggest inserting 'this->' as a fixit.
-  SourceLocation Loc = NameInfo.getLoc();
-  auto DB = S.Diag(Loc, diag::ext_undeclared_unqual_id_with_dependent_base);
-  DB << NameInfo.getName() << RD;
-
-  if (!ThisType.isNull()) {
-    DB << FixItHint::CreateInsertion(Loc, "this->");
-    return CXXDependentScopeMemberExpr::Create(
-        Context, /*This=*/nullptr, ThisType, /*IsArrow=*/true,
-        /*Op=*/SourceLocation(), NestedNameSpecifierLoc(), TemplateKWLoc,
-        /*FirstQualifierInScope=*/nullptr, NameInfo, TemplateArgs);
-  }
-
-  // Synthesize a fake NNS that points to the derived class.  This will
-  // perform name lookup during template instantiation.
-  CXXScopeSpec SS;
-  auto *NNS =
-      NestedNameSpecifier::Create(Context, nullptr, true, RD->getTypeForDecl());
-  SS.MakeTrivial(Context, NNS, SourceRange(Loc, Loc));
-  return DependentScopeDeclRefExpr::Create(
-      Context, SS.getWithLocInContext(Context), TemplateKWLoc, NameInfo,
-      TemplateArgs);
-}
-
-ExprResult
-Sema::ActOnIdExpression(Scope *S, CXXScopeSpec &SS,
-                        SourceLocation TemplateKWLoc, UnqualifiedId &Id,
-                        bool HasTrailingLParen, bool IsAddressOfOperand,
-                        std::unique_ptr<CorrectionCandidateCallback> CCC,
-                        bool IsInlineAsmIdentifier, Token *KeywordReplacement) {
-  assert(!(IsAddressOfOperand && HasTrailingLParen) &&
-         "cannot be direct & operand and have a trailing lparen");
-  if (SS.isInvalid())
-    return ExprError();
-
-  TemplateArgumentListInfo TemplateArgsBuffer;
-
-  // Decompose the UnqualifiedId into the following data.
-  DeclarationNameInfo NameInfo;
-  const TemplateArgumentListInfo *TemplateArgs;
-  DecomposeUnqualifiedId(Id, TemplateArgsBuffer, NameInfo, TemplateArgs);
-
-  DeclarationName Name = NameInfo.getName();
-  IdentifierInfo *II = Name.getAsIdentifierInfo();
-  SourceLocation NameLoc = NameInfo.getLoc();
-
-  if (II && II->isEditorPlaceholder()) {
-    // FIXME: When typed placeholders are supported we can create a typed
-    // placeholder expression node.
-    return ExprError();
-  }
-
-  // C++ [temp.dep.expr]p3:
-  //   An id-expression is type-dependent if it contains:
-  //     -- an identifier that was declared with a dependent type,
-  //        (note: handled after lookup)
-  //     -- a template-id that is dependent,
-  //        (note: handled in BuildTemplateIdExpr)
-  //     -- a conversion-function-id that specifies a dependent type,
-  //     -- a nested-name-specifier that contains a class-name that
-  //        names a dependent type.
-  // Determine whether this is a member of an unknown specialization;
-  // we need to handle these differently.
-  bool DependentID = false;
-  if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName &&
-      Name.getCXXNameType()->isDependentType()) {
-    DependentID = true;
-  } else if (SS.isSet()) {
-    if (DeclContext *DC = computeDeclContext(SS, false)) {
-      if (RequireCompleteDeclContext(SS, DC))
-        return ExprError();
-    } else {
-      DependentID = true;
-    }
-  }
-
-  if (DependentID)
-    return ActOnDependentIdExpression(SS, TemplateKWLoc, NameInfo,
-                                      IsAddressOfOperand, TemplateArgs);
-
-  // Perform the required lookup.
-  LookupResult R(*this, NameInfo,
-                 (Id.getKind() == UnqualifiedIdKind::IK_ImplicitSelfParam)
-                     ? LookupObjCImplicitSelfParam
-                     : LookupOrdinaryName);
-  if (TemplateKWLoc.isValid() || TemplateArgs) {
-    // Lookup the template name again to correctly establish the context in
-    // which it was found. This is really unfortunate as we already did the
-    // lookup to determine that it was a template name in the first place. If
-    // this becomes a performance hit, we can work harder to preserve those
-    // results until we get here but it's likely not worth it.
-    bool MemberOfUnknownSpecialization;
-    if (LookupTemplateName(R, S, SS, QualType(), /*EnteringContext=*/false,
-                           MemberOfUnknownSpecialization, TemplateKWLoc))
-      return ExprError();
-
-    if (MemberOfUnknownSpecialization ||
-        (R.getResultKind() == LookupResult::NotFoundInCurrentInstantiation))
-      return ActOnDependentIdExpression(SS, TemplateKWLoc, NameInfo,
-                                        IsAddressOfOperand, TemplateArgs);
-  } else {
-    bool IvarLookupFollowUp = II && !SS.isSet() && getCurMethodDecl();
-    LookupParsedName(R, S, &SS, !IvarLookupFollowUp);
-
-    // If the result might be in a dependent base class, this is a dependent
-    // id-expression.
-    if (R.getResultKind() == LookupResult::NotFoundInCurrentInstantiation)
-      return ActOnDependentIdExpression(SS, TemplateKWLoc, NameInfo,
-                                        IsAddressOfOperand, TemplateArgs);
-
-    // If this reference is in an Objective-C method, then we need to do
-    // some special Objective-C lookup, too.
-    if (IvarLookupFollowUp) {
-      ExprResult E(LookupInObjCMethod(R, S, II, true));
-      if (E.isInvalid())
-        return ExprError();
-
-      if (Expr *Ex = E.getAs<Expr>())
-        return Ex;
-    }
-  }
-
-  if (R.isAmbiguous())
-    return ExprError();
-
-  // This could be an implicitly declared function reference (legal in C90,
-  // extension in C99, forbidden in C++).
-  if (R.empty() && HasTrailingLParen && II && !getLangOpts().CPlusPlus) {
-    NamedDecl *D = ImplicitlyDefineFunction(NameLoc, *II, S);
-    if (D) R.addDecl(D);
-  }
-
-  // Determine whether this name might be a candidate for
-  // argument-dependent lookup.
-  bool ADL = UseArgumentDependentLookup(SS, R, HasTrailingLParen);
-
-  if (R.empty() && !ADL) {
-    if (SS.isEmpty() && getLangOpts().MSVCCompat) {
-      if (Expr *E = recoverFromMSUnqualifiedLookup(*this, Context, NameInfo,
-                                                   TemplateKWLoc, TemplateArgs))
-        return E;
-    }
-
-    // Don't diagnose an empty lookup for inline assembly.
-    if (IsInlineAsmIdentifier)
-      return ExprError();
-
-    // If this name wasn't predeclared and if this is not a function
-    // call, diagnose the problem.
-    TypoExpr *TE = nullptr;
-    auto DefaultValidator = llvm::make_unique<CorrectionCandidateCallback>(
-        II, SS.isValid() ? SS.getScopeRep() : nullptr);
-    DefaultValidator->IsAddressOfOperand = IsAddressOfOperand;
-    assert((!CCC || CCC->IsAddressOfOperand == IsAddressOfOperand) &&
-           "Typo correction callback misconfigured");
-    if (CCC) {
-      // Make sure the callback knows what the typo being diagnosed is.
-      CCC->setTypoName(II);
-      if (SS.isValid())
-        CCC->setTypoNNS(SS.getScopeRep());
-    }
-    // FIXME: DiagnoseEmptyLookup produces bad diagnostics if we're looking for
-    // a template name, but we happen to have always already looked up the name
-    // before we get here if it must be a template name.
-    if (DiagnoseEmptyLookup(S, SS, R,
-                            CCC ? std::move(CCC) : std::move(DefaultValidator),
-                            nullptr, None, &TE)) {
-      if (TE && KeywordReplacement) {
-        auto &State = getTypoExprState(TE);
-        auto BestTC = State.Consumer->getNextCorrection();
-        if (BestTC.isKeyword()) {
-          auto *II = BestTC.getCorrectionAsIdentifierInfo();
-          if (State.DiagHandler)
-            State.DiagHandler(BestTC);
-          KeywordReplacement->startToken();
-          KeywordReplacement->setKind(II->getTokenID());
-          KeywordReplacement->setIdentifierInfo(II);
-          KeywordReplacement->setLocation(BestTC.getCorrectionRange().getBegin());
-          // Clean up the state associated with the TypoExpr, since it has
-          // now been diagnosed (without a call to CorrectDelayedTyposInExpr).
-          clearDelayedTypo(TE);
-          // Signal that a correction to a keyword was performed by returning a
-          // valid-but-null ExprResult.
-          return (Expr*)nullptr;
-        }
-        State.Consumer->resetCorrectionStream();
-      }
-      return TE ? TE : ExprError();
-    }
-
-    assert(!R.empty() &&
-           "DiagnoseEmptyLookup returned false but added no results");
-
-    // If we found an Objective-C instance variable, let
-    // LookupInObjCMethod build the appropriate expression to
-    // reference the ivar.
-    if (ObjCIvarDecl *Ivar = R.getAsSingle<ObjCIvarDecl>()) {
-      R.clear();
-      ExprResult E(LookupInObjCMethod(R, S, Ivar->getIdentifier()));
-      // In a hopelessly buggy code, Objective-C instance variable
-      // lookup fails and no expression will be built to reference it.
-      if (!E.isInvalid() && !E.get())
-        return ExprError();
-      return E;
-    }
-  }
-
-  // This is guaranteed from this point on.
-  assert(!R.empty() || ADL);
-
-  // Check whether this might be a C++ implicit instance member access.
-  // C++ [class.mfct.non-static]p3:
-  //   When an id-expression that is not part of a class member access
-  //   syntax and not used to form a pointer to member is used in the
-  //   body of a non-static member function of class X, if name lookup
-  //   resolves the name in the id-expression to a non-static non-type
-  //   member of some class C, the id-expression is transformed into a
-  //   class member access expression using (*this) as the
-  //   postfix-expression to the left of the . operator.
-  //
-  // But we don't actually need to do this for '&' operands if R
-  // resolved to a function or overloaded function set, because the
-  // expression is ill-formed if it actually works out to be a
-  // non-static member function:
-  //
-  // C++ [expr.ref]p4:
-  //   Otherwise, if E1.E2 refers to a non-static member function. . .
-  //   [t]he expression can be used only as the left-hand operand of a
-  //   member function call.
-  //
-  // There are other safeguards against such uses, but it's important
-  // to get this right here so that we don't end up making a
-  // spuriously dependent expression if we're inside a dependent
-  // instance method.
-  if (!R.empty() && (*R.begin())->isCXXClassMember()) {
-    bool MightBeImplicitMember;
-    if (!IsAddressOfOperand)
-      MightBeImplicitMember = true;
-    else if (!SS.isEmpty())
-      MightBeImplicitMember = false;
-    else if (R.isOverloadedResult())
-      MightBeImplicitMember = false;
-    else if (R.isUnresolvableResult())
-      MightBeImplicitMember = true;
-    else
-      MightBeImplicitMember = isa<FieldDecl>(R.getFoundDecl()) ||
-                              isa<IndirectFieldDecl>(R.getFoundDecl()) ||
-                              isa<MSPropertyDecl>(R.getFoundDecl());
-
-    if (MightBeImplicitMember)
-      return BuildPossibleImplicitMemberExpr(SS, TemplateKWLoc,
-                                             R, TemplateArgs, S);
-  }
-
-  if (TemplateArgs || TemplateKWLoc.isValid()) {
-
-    // In C++1y, if this is a variable template id, then check it
-    // in BuildTemplateIdExpr().
-    // The single lookup result must be a variable template declaration.
-    if (Id.getKind() == UnqualifiedIdKind::IK_TemplateId && Id.TemplateId &&
-        Id.TemplateId->Kind == TNK_Var_template) {
-      assert(R.getAsSingle<VarTemplateDecl>() &&
-             "There should only be one declaration found.");
-    }
-
-    return BuildTemplateIdExpr(SS, TemplateKWLoc, R, ADL, TemplateArgs);
-  }
-
-  return BuildDeclarationNameExpr(SS, R, ADL);
-}
-
-/// BuildQualifiedDeclarationNameExpr - Build a C++ qualified
-/// declaration name, generally during template instantiation.
-/// There's a large number of things which don't need to be done along
-/// this path.
-ExprResult Sema::BuildQualifiedDeclarationNameExpr(
-    CXXScopeSpec &SS, const DeclarationNameInfo &NameInfo,
-    bool IsAddressOfOperand, const Scope *S, TypeSourceInfo **RecoveryTSI) {
-  DeclContext *DC = computeDeclContext(SS, false);
-  if (!DC)
-    return BuildDependentDeclRefExpr(SS, /*TemplateKWLoc=*/SourceLocation(),
-                                     NameInfo, /*TemplateArgs=*/nullptr);
-
-  if (RequireCompleteDeclContext(SS, DC))
-    return ExprError();
-
-  LookupResult R(*this, NameInfo, LookupOrdinaryName);
-  LookupQualifiedName(R, DC);
-
-  if (R.isAmbiguous())
-    return ExprError();
-
-  if (R.getResultKind() == LookupResult::NotFoundInCurrentInstantiation)
-    return BuildDependentDeclRefExpr(SS, /*TemplateKWLoc=*/SourceLocation(),
-                                     NameInfo, /*TemplateArgs=*/nullptr);
-
-  if (R.empty()) {
-    Diag(NameInfo.getLoc(), diag::err_no_member)
-      << NameInfo.getName() << DC << SS.getRange();
-    return ExprError();
-  }
-
-  if (const TypeDecl *TD = R.getAsSingle<TypeDecl>()) {
-    // Diagnose a missing typename if this resolved unambiguously to a type in
-    // a dependent context.  If we can recover with a type, downgrade this to
-    // a warning in Microsoft compatibility mode.
-    unsigned DiagID = diag::err_typename_missing;
-    if (RecoveryTSI && getLangOpts().MSVCCompat)
-      DiagID = diag::ext_typename_missing;
-    SourceLocation Loc = SS.getBeginLoc();
-    auto D = Diag(Loc, DiagID);
-    D << SS.getScopeRep() << NameInfo.getName().getAsString()
-      << SourceRange(Loc, NameInfo.getEndLoc());
-
-    // Don't recover if the caller isn't expecting us to or if we're in a SFINAE
-    // context.
-    if (!RecoveryTSI)
-      return ExprError();
-
-    // Only issue the fixit if we're prepared to recover.
-    D << FixItHint::CreateInsertion(Loc, "typename ");
-
-    // Recover by pretending this was an elaborated type.
-    QualType Ty = Context.getTypeDeclType(TD);
-    TypeLocBuilder TLB;
-    TLB.pushTypeSpec(Ty).setNameLoc(NameInfo.getLoc());
-
-    QualType ET = getElaboratedType(ETK_None, SS, Ty);
-    ElaboratedTypeLoc QTL = TLB.push<ElaboratedTypeLoc>(ET);
-    QTL.setElaboratedKeywordLoc(SourceLocation());
-    QTL.setQualifierLoc(SS.getWithLocInContext(Context));
-
-    *RecoveryTSI = TLB.getTypeSourceInfo(Context, ET);
-
-    return ExprEmpty();
-  }
-
-  // Defend against this resolving to an implicit member access. We usually
-  // won't get here if this might be a legitimate a class member (we end up in
-  // BuildMemberReferenceExpr instead), but this can be valid if we're forming
-  // a pointer-to-member or in an unevaluated context in C++11.
-  if (!R.empty() && (*R.begin())->isCXXClassMember() && !IsAddressOfOperand)
-    return BuildPossibleImplicitMemberExpr(SS,
-                                           /*TemplateKWLoc=*/SourceLocation(),
-                                           R, /*TemplateArgs=*/nullptr, S);
-
-  return BuildDeclarationNameExpr(SS, R, /* ADL */ false);
-}
-
-/// LookupInObjCMethod - The parser has read a name in, and Sema has
-/// detected that we're currently inside an ObjC method.  Perform some
-/// additional lookup.
-///
-/// Ideally, most of this would be done by lookup, but there's
-/// actually quite a lot of extra work involved.
-///
-/// Returns a null sentinel to indicate trivial success.
-ExprResult
-Sema::LookupInObjCMethod(LookupResult &Lookup, Scope *S,
-                         IdentifierInfo *II, bool AllowBuiltinCreation) {
-  SourceLocation Loc = Lookup.getNameLoc();
-  ObjCMethodDecl *CurMethod = getCurMethodDecl();
-
-  // Check for error condition which is already reported.
-  if (!CurMethod)
-    return ExprError();
-
-  // There are two cases to handle here.  1) scoped lookup could have failed,
-  // in which case we should look for an ivar.  2) scoped lookup could have
-  // found a decl, but that decl is outside the current instance method (i.e.
-  // a global variable).  In these two cases, we do a lookup for an ivar with
-  // this name, if the lookup sucedes, we replace it our current decl.
-
-  // If we're in a class method, we don't normally want to look for
-  // ivars.  But if we don't find anything else, and there's an
-  // ivar, that's an error.
-  bool IsClassMethod = CurMethod->isClassMethod();
-
-  bool LookForIvars;
-  if (Lookup.empty())
-    LookForIvars = true;
-  else if (IsClassMethod)
-    LookForIvars = false;
-  else
-    LookForIvars = (Lookup.isSingleResult() &&
-                    Lookup.getFoundDecl()->isDefinedOutsideFunctionOrMethod());
-  ObjCInterfaceDecl *IFace = nullptr;
-  if (LookForIvars) {
-    IFace = CurMethod->getClassInterface();
-    ObjCInterfaceDecl *ClassDeclared;
-    ObjCIvarDecl *IV = nullptr;
-    if (IFace && (IV = IFace->lookupInstanceVariable(II, ClassDeclared))) {
-      // Diagnose using an ivar in a class method.
-      if (IsClassMethod)
-        return ExprError(Diag(Loc, diag::err_ivar_use_in_class_method)
-                         << IV->getDeclName());
-
-      // If we're referencing an invalid decl, just return this as a silent
-      // error node.  The error diagnostic was already emitted on the decl.
-      if (IV->isInvalidDecl())
-        return ExprError();
-
-      // Check if referencing a field with __attribute__((deprecated)).
-      if (DiagnoseUseOfDecl(IV, Loc))
-        return ExprError();
-
-      // Diagnose the use of an ivar outside of the declaring class.
-      if (IV->getAccessControl() == ObjCIvarDecl::Private &&
-          !declaresSameEntity(ClassDeclared, IFace) &&
-          !getLangOpts().DebuggerSupport)
-        Diag(Loc, diag::err_private_ivar_access) << IV->getDeclName();
-
-      // FIXME: This should use a new expr for a direct reference, don't
-      // turn this into Self->ivar, just return a BareIVarExpr or something.
-      IdentifierInfo &II = Context.Idents.get("self");
-      UnqualifiedId SelfName;
-      SelfName.setIdentifier(&II, SourceLocation());
-      SelfName.setKind(UnqualifiedIdKind::IK_ImplicitSelfParam);
-      CXXScopeSpec SelfScopeSpec;
-      SourceLocation TemplateKWLoc;
-      ExprResult SelfExpr = ActOnIdExpression(S, SelfScopeSpec, TemplateKWLoc,
-                                              SelfName, false, false);
-      if (SelfExpr.isInvalid())
-        return ExprError();
-
-      SelfExpr = DefaultLvalueConversion(SelfExpr.get());
-      if (SelfExpr.isInvalid())
-        return ExprError();
-
-      MarkAnyDeclReferenced(Loc, IV, true);
-
-      ObjCMethodFamily MF = CurMethod->getMethodFamily();
-      if (MF != OMF_init && MF != OMF_dealloc && MF != OMF_finalize &&
-          !IvarBacksCurrentMethodAccessor(IFace, CurMethod, IV))
-        Diag(Loc, diag::warn_direct_ivar_access) << IV->getDeclName();
-
-      ObjCIvarRefExpr *Result = new (Context)
-          ObjCIvarRefExpr(IV, IV->getUsageType(SelfExpr.get()->getType()), Loc,
-                          IV->getLocation(), SelfExpr.get(), true, true);
-
-      if (IV->getType().getObjCLifetime() == Qualifiers::OCL_Weak) {
-        if (!isUnevaluatedContext() &&
-            !Diags.isIgnored(diag::warn_arc_repeated_use_of_weak, Loc))
-          getCurFunction()->recordUseOfWeak(Result);
-      }
-      if (getLangOpts().ObjCAutoRefCount) {
-        if (CurContext->isClosure())
-          Diag(Loc, diag::warn_implicitly_retains_self)
-            << FixItHint::CreateInsertion(Loc, "self->");
-      }
-
-      return Result;
-    }
-  } else if (CurMethod->isInstanceMethod()) {
-    // We should warn if a local variable hides an ivar.
-    if (ObjCInterfaceDecl *IFace = CurMethod->getClassInterface()) {
-      ObjCInterfaceDecl *ClassDeclared;
-      if (ObjCIvarDecl *IV = IFace->lookupInstanceVariable(II, ClassDeclared)) {
-        if (IV->getAccessControl() != ObjCIvarDecl::Private ||
-            declaresSameEntity(IFace, ClassDeclared))
-          Diag(Loc, diag::warn_ivar_use_hidden) << IV->getDeclName();
-      }
-    }
-  } else if (Lookup.isSingleResult() &&
-             Lookup.getFoundDecl()->isDefinedOutsideFunctionOrMethod()) {
-    // If accessing a stand-alone ivar in a class method, this is an error.
-    if (const ObjCIvarDecl *IV = dyn_cast<ObjCIvarDecl>(Lookup.getFoundDecl()))
-      return ExprError(Diag(Loc, diag::err_ivar_use_in_class_method)
-                       << IV->getDeclName());
-  }
-
-  if (Lookup.empty() && II && AllowBuiltinCreation) {
-    // FIXME. Consolidate this with similar code in LookupName.
-    if (unsigned BuiltinID = II->getBuiltinID()) {
-      if (!(getLangOpts().CPlusPlus &&
-            Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID))) {
-        NamedDecl *D = LazilyCreateBuiltin((IdentifierInfo *)II, BuiltinID,
-                                           S, Lookup.isForRedeclaration(),
-                                           Lookup.getNameLoc());
-        if (D) Lookup.addDecl(D);
-      }
-    }
-  }
-  // Sentinel value saying that we didn't do anything special.
-  return ExprResult((Expr *)nullptr);
-}
-
-/// Cast a base object to a member's actual type.
-///
-/// Logically this happens in three phases:
-///
-/// * First we cast from the base type to the naming class.
-///   The naming class is the class into which we were looking
-///   when we found the member;  it's the qualifier type if a
-///   qualifier was provided, and otherwise it's the base type.
-///
-/// * Next we cast from the naming class to the declaring class.
-///   If the member we found was brought into a class's scope by
-///   a using declaration, this is that class;  otherwise it's
-///   the class declaring the member.
-///
-/// * Finally we cast from the declaring class to the "true"
-///   declaring class of the member.  This conversion does not
-///   obey access control.
-ExprResult
-Sema::PerformObjectMemberConversion(Expr *From,
-                                    NestedNameSpecifier *Qualifier,
-                                    NamedDecl *FoundDecl,
-                                    NamedDecl *Member) {
-  CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(Member->getDeclContext());
-  if (!RD)
-    return From;
-
-  QualType DestRecordType;
-  QualType DestType;
-  QualType FromRecordType;
-  QualType FromType = From->getType();
-  bool PointerConversions = false;
-  if (isa<FieldDecl>(Member)) {
-    DestRecordType = Context.getCanonicalType(Context.getTypeDeclType(RD));
-
-    if (FromType->getAs<PointerType>()) {
-      DestType = Context.getPointerType(DestRecordType);
-      FromRecordType = FromType->getPointeeType();
-      PointerConversions = true;
-    } else {
-      DestType = DestRecordType;
-      FromRecordType = FromType;
-    }
-  } else if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(Member)) {
-    if (Method->isStatic())
-      return From;
-
-    DestType = Method->getThisType();
-    DestRecordType = DestType->getPointeeType();
-
-    if (FromType->getAs<PointerType>()) {
-      FromRecordType = FromType->getPointeeType();
-      PointerConversions = true;
-    } else {
-      FromRecordType = FromType;
-      DestType = DestRecordType;
-    }
-  } else {
-    // No conversion necessary.
-    return From;
-  }
-
-  if (DestType->isDependentType() || FromType->isDependentType())
-    return From;
-
-  // If the unqualified types are the same, no conversion is necessary.
-  if (Context.hasSameUnqualifiedType(FromRecordType, DestRecordType))
-    return From;
-
-  SourceRange FromRange = From->getSourceRange();
-  SourceLocation FromLoc = FromRange.getBegin();
-
-  ExprValueKind VK = From->getValueKind();
-
-  // C++ [class.member.lookup]p8:
-  //   [...] Ambiguities can often be resolved by qualifying a name with its
-  //   class name.
-  //
-  // If the member was a qualified name and the qualified referred to a
-  // specific base subobject type, we'll cast to that intermediate type
-  // first and then to the object in which the member is declared. That allows
-  // one to resolve ambiguities in, e.g., a diamond-shaped hierarchy such as:
-  //
-  //   class Base { public: int x; };
-  //   class Derived1 : public Base { };
-  //   class Derived2 : public Base { };
-  //   class VeryDerived : public Derived1, public Derived2 { void f(); };
-  //
-  //   void VeryDerived::f() {
-  //     x = 17; // error: ambiguous base subobjects
-  //     Derived1::x = 17; // okay, pick the Base subobject of Derived1
-  //   }
-  if (Qualifier && Qualifier->getAsType()) {
-    QualType QType = QualType(Qualifier->getAsType(), 0);
-    assert(QType->isRecordType() && "lookup done with non-record type");
-
-    QualType QRecordType = QualType(QType->getAs<RecordType>(), 0);
-
-    // In C++98, the qualifier type doesn't actually have to be a base
-    // type of the object type, in which case we just ignore it.
-    // Otherwise build the appropriate casts.
-    if (IsDerivedFrom(FromLoc, FromRecordType, QRecordType)) {
-      CXXCastPath BasePath;
-      if (CheckDerivedToBaseConversion(FromRecordType, QRecordType,
-                                       FromLoc, FromRange, &BasePath))
-        return ExprError();
-
-      if (PointerConversions)
-        QType = Context.getPointerType(QType);
-      From = ImpCastExprToType(From, QType, CK_UncheckedDerivedToBase,
-                               VK, &BasePath).get();
-
-      FromType = QType;
-      FromRecordType = QRecordType;
-
-      // If the qualifier type was the same as the destination type,
-      // we're done.
-      if (Context.hasSameUnqualifiedType(FromRecordType, DestRecordType))
-        return From;
-    }
-  }
-
-  bool IgnoreAccess = false;
-
-  // If we actually found the member through a using declaration, cast
-  // down to the using declaration's type.
-  //
-  // Pointer equality is fine here because only one declaration of a
-  // class ever has member declarations.
-  if (FoundDecl->getDeclContext() != Member->getDeclContext()) {
-    assert(isa<UsingShadowDecl>(FoundDecl));
-    QualType URecordType = Context.getTypeDeclType(
-                           cast<CXXRecordDecl>(FoundDecl->getDeclContext()));
-
-    // We only need to do this if the naming-class to declaring-class
-    // conversion is non-trivial.
-    if (!Context.hasSameUnqualifiedType(FromRecordType, URecordType)) {
-      assert(IsDerivedFrom(FromLoc, FromRecordType, URecordType));
-      CXXCastPath BasePath;
-      if (CheckDerivedToBaseConversion(FromRecordType, URecordType,
-                                       FromLoc, FromRange, &BasePath))
-        return ExprError();
-
-      QualType UType = URecordType;
-      if (PointerConversions)
-        UType = Context.getPointerType(UType);
-      From = ImpCastExprToType(From, UType, CK_UncheckedDerivedToBase,
-                               VK, &BasePath).get();
-      FromType = UType;
-      FromRecordType = URecordType;
-    }
-
-    // We don't do access control for the conversion from the
-    // declaring class to the true declaring class.
-    IgnoreAccess = true;
-  }
-
-  CXXCastPath BasePath;
-  if (CheckDerivedToBaseConversion(FromRecordType, DestRecordType,
-                                   FromLoc, FromRange, &BasePath,
-                                   IgnoreAccess))
-    return ExprError();
-
-  return ImpCastExprToType(From, DestType, CK_UncheckedDerivedToBase,
-                           VK, &BasePath);
-}
-
-bool Sema::UseArgumentDependentLookup(const CXXScopeSpec &SS,
-                                      const LookupResult &R,
-                                      bool HasTrailingLParen) {
-  // Only when used directly as the postfix-expression of a call.
-  if (!HasTrailingLParen)
-    return false;
-
-  // Never if a scope specifier was provided.
-  if (SS.isSet())
-    return false;
-
-  // Only in C++ or ObjC++.
-  if (!getLangOpts().CPlusPlus)
-    return false;
-
-  // Turn off ADL when we find certain kinds of declarations during
-  // normal lookup:
-  for (NamedDecl *D : R) {
-    // C++0x [basic.lookup.argdep]p3:
-    //     -- a declaration of a class member
-    // Since using decls preserve this property, we check this on the
-    // original decl.
-    if (D->isCXXClassMember())
-      return false;
-
-    // C++0x [basic.lookup.argdep]p3:
-    //     -- a block-scope function declaration that is not a
-    //        using-declaration
-    // NOTE: we also trigger this for function templates (in fact, we
-    // don't check the decl type at all, since all other decl types
-    // turn off ADL anyway).
-    if (isa<UsingShadowDecl>(D))
-      D = cast<UsingShadowDecl>(D)->getTargetDecl();
-    else if (D->getLexicalDeclContext()->isFunctionOrMethod())
-      return false;
-
-    // C++0x [basic.lookup.argdep]p3:
-    //     -- a declaration that is neither a function or a function
-    //        template
-    // And also for builtin functions.
-    if (isa<FunctionDecl>(D)) {
-      FunctionDecl *FDecl = cast<FunctionDecl>(D);
-
-      // But also builtin functions.
-      if (FDecl->getBuiltinID() && FDecl->isImplicit())
-        return false;
-    } else if (!isa<FunctionTemplateDecl>(D))
-      return false;
-  }
-
-  return true;
-}
-
-
-/// Diagnoses obvious problems with the use of the given declaration
-/// as an expression.  This is only actually called for lookups that
-/// were not overloaded, and it doesn't promise that the declaration
-/// will in fact be used.
-static bool CheckDeclInExpr(Sema &S, SourceLocation Loc, NamedDecl *D) {
-  if (D->isInvalidDecl())
-    return true;
-
-  if (isa<TypedefNameDecl>(D)) {
-    S.Diag(Loc, diag::err_unexpected_typedef) << D->getDeclName();
-    return true;
-  }
-
-  if (isa<ObjCInterfaceDecl>(D)) {
-    S.Diag(Loc, diag::err_unexpected_interface) << D->getDeclName();
-    return true;
-  }
-
-  if (isa<NamespaceDecl>(D)) {
-    S.Diag(Loc, diag::err_unexpected_namespace) << D->getDeclName();
-    return true;
-  }
-
-  return false;
-}
-
-// Certain multiversion types should be treated as overloaded even when there is
-// only one result.
-static bool ShouldLookupResultBeMultiVersionOverload(const LookupResult &R) {
-  assert(R.isSingleResult() && "Expected only a single result");
-  const auto *FD = dyn_cast<FunctionDecl>(R.getFoundDecl());
-  return FD &&
-         (FD->isCPUDispatchMultiVersion() || FD->isCPUSpecificMultiVersion());
-}
-
-ExprResult Sema::BuildDeclarationNameExpr(const CXXScopeSpec &SS,
-                                          LookupResult &R, bool NeedsADL,
-                                          bool AcceptInvalidDecl) {
-  // If this is a single, fully-resolved result and we don't need ADL,
-  // just build an ordinary singleton decl ref.
-  if (!NeedsADL && R.isSingleResult() &&
-      !R.getAsSingle<FunctionTemplateDecl>() &&
-      !ShouldLookupResultBeMultiVersionOverload(R))
-    return BuildDeclarationNameExpr(SS, R.getLookupNameInfo(), R.getFoundDecl(),
-                                    R.getRepresentativeDecl(), nullptr,
-                                    AcceptInvalidDecl);
-
-  // We only need to check the declaration if there's exactly one
-  // result, because in the overloaded case the results can only be
-  // functions and function templates.
-  if (R.isSingleResult() && !ShouldLookupResultBeMultiVersionOverload(R) &&
-      CheckDeclInExpr(*this, R.getNameLoc(), R.getFoundDecl()))
-    return ExprError();
-
-  // Otherwise, just build an unresolved lookup expression.  Suppress
-  // any lookup-related diagnostics; we'll hash these out later, when
-  // we've picked a target.
-  R.suppressDiagnostics();
-
-  UnresolvedLookupExpr *ULE
-    = UnresolvedLookupExpr::Create(Context, R.getNamingClass(),
-                                   SS.getWithLocInContext(Context),
-                                   R.getLookupNameInfo(),
-                                   NeedsADL, R.isOverloadedResult(),
-                                   R.begin(), R.end());
-
-  return ULE;
-}
-
-static void
-diagnoseUncapturableValueReference(Sema &S, SourceLocation loc,
-                                   ValueDecl *var, DeclContext *DC);
-
-/// Complete semantic analysis for a reference to the given declaration.
-ExprResult Sema::BuildDeclarationNameExpr(
-    const CXXScopeSpec &SS, const DeclarationNameInfo &NameInfo, NamedDecl *D,
-    NamedDecl *FoundD, const TemplateArgumentListInfo *TemplateArgs,
-    bool AcceptInvalidDecl) {
-  assert(D && "Cannot refer to a NULL declaration");
-  assert(!isa<FunctionTemplateDecl>(D) &&
-         "Cannot refer unambiguously to a function template");
-
-  SourceLocation Loc = NameInfo.getLoc();
-  if (CheckDeclInExpr(*this, Loc, D))
-    return ExprError();
-
-  if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) {
-    // Specifically diagnose references to class templates that are missing
-    // a template argument list.
-    diagnoseMissingTemplateArguments(TemplateName(Template), Loc);
-    return ExprError();
-  }
-
-  // Make sure that we're referring to a value.
-  ValueDecl *VD = dyn_cast<ValueDecl>(D);
-  if (!VD) {
-    Diag(Loc, diag::err_ref_non_value)
-      << D << SS.getRange();
-    Diag(D->getLocation(), diag::note_declared_at);
-    return ExprError();
-  }
-
-  // Check whether this declaration can be used. Note that we suppress
-  // this check when we're going to perform argument-dependent lookup
-  // on this function name, because this might not be the function
-  // that overload resolution actually selects.
-  if (DiagnoseUseOfDecl(VD, Loc))
-    return ExprError();
-
-  // Only create DeclRefExpr's for valid Decl's.
-  if (VD->isInvalidDecl() && !AcceptInvalidDecl)
-    return ExprError();
-
-  // Handle members of anonymous structs and unions.  If we got here,
-  // and the reference is to a class member indirect field, then this
-  // must be the subject of a pointer-to-member expression.
-  if (IndirectFieldDecl *indirectField = dyn_cast<IndirectFieldDecl>(VD))
-    if (!indirectField->isCXXClassMember())
-      return BuildAnonymousStructUnionMemberReference(SS, NameInfo.getLoc(),
-                                                      indirectField);
-
-  {
-    QualType type = VD->getType();
-    if (type.isNull())
-      return ExprError();
-    if (auto *FPT = type->getAs<FunctionProtoType>()) {
-      // C++ [except.spec]p17:
-      //   An exception-specification is considered to be needed when:
-      //   - in an expression, the function is the unique lookup result or
-      //     the selected member of a set of overloaded functions.
-      ResolveExceptionSpec(Loc, FPT);
-      type = VD->getType();
-    }
-    ExprValueKind valueKind = VK_RValue;
-
-    switch (D->getKind()) {
-    // Ignore all the non-ValueDecl kinds.
-#define ABSTRACT_DECL(kind)
-#define VALUE(type, base)
-#define DECL(type, base) \
-    case Decl::type:
-#include "clang/AST/DeclNodes.inc"
-      llvm_unreachable("invalid value decl kind");
-
-    // These shouldn't make it here.
-    case Decl::ObjCAtDefsField:
-    case Decl::ObjCIvar:
-      llvm_unreachable("forming non-member reference to ivar?");
-
-    // Enum constants are always r-values and never references.
-    // Unresolved using declarations are dependent.
-    case Decl::EnumConstant:
-    case Decl::UnresolvedUsingValue:
-    case Decl::OMPDeclareReduction:
-      valueKind = VK_RValue;
-      break;
-
-    // Fields and indirect fields that got here must be for
-    // pointer-to-member expressions; we just call them l-values for
-    // internal consistency, because this subexpression doesn't really
-    // exist in the high-level semantics.
-    case Decl::Field:
-    case Decl::IndirectField:
-      assert(getLangOpts().CPlusPlus &&
-             "building reference to field in C?");
-
-      // These can't have reference type in well-formed programs, but
-      // for internal consistency we do this anyway.
-      type = type.getNonReferenceType();
-      valueKind = VK_LValue;
-      break;
-
-    // Non-type template parameters are either l-values or r-values
-    // depending on the type.
-    case Decl::NonTypeTemplateParm: {
-      if (const ReferenceType *reftype = type->getAs<ReferenceType>()) {
-        type = reftype->getPointeeType();
-        valueKind = VK_LValue; // even if the parameter is an r-value reference
-        break;
-      }
-
-      // For non-references, we need to strip qualifiers just in case
-      // the template parameter was declared as 'const int' or whatever.
-      valueKind = VK_RValue;
-      type = type.getUnqualifiedType();
-      break;
-    }
-
-    case Decl::Var:
-    case Decl::VarTemplateSpecialization:
-    case Decl::VarTemplatePartialSpecialization:
-    case Decl::Decomposition:
-    case Decl::OMPCapturedExpr:
-      // In C, "extern void blah;" is valid and is an r-value.
-      if (!getLangOpts().CPlusPlus &&
-          !type.hasQualifiers() &&
-          type->isVoidType()) {
-        valueKind = VK_RValue;
-        break;
-      }
-      LLVM_FALLTHROUGH;
-
-    case Decl::ImplicitParam:
-    case Decl::ParmVar: {
-      // These are always l-values.
-      valueKind = VK_LValue;
-      type = type.getNonReferenceType();
-
-      // FIXME: Does the addition of const really only apply in
-      // potentially-evaluated contexts? Since the variable isn't actually
-      // captured in an unevaluated context, it seems that the answer is no.
-      if (!isUnevaluatedContext()) {
-        QualType CapturedType = getCapturedDeclRefType(cast<VarDecl>(VD), Loc);
-        if (!CapturedType.isNull())
-          type = CapturedType;
-      }
-
-      break;
-    }
-
-    case Decl::Binding: {
-      // These are always lvalues.
-      valueKind = VK_LValue;
-      type = type.getNonReferenceType();
-      // FIXME: Support lambda-capture of BindingDecls, once CWG actually
-      // decides how that's supposed to work.
-      auto *BD = cast<BindingDecl>(VD);
-      if (BD->getDeclContext()->isFunctionOrMethod() &&
-          BD->getDeclContext() != CurContext)
-        diagnoseUncapturableValueReference(*this, Loc, BD, CurContext);
-      break;
-    }
-
-    case Decl::Function: {
-      if (unsigned BID = cast<FunctionDecl>(VD)->getBuiltinID()) {
-        if (!Context.BuiltinInfo.isPredefinedLibFunction(BID)) {
-          type = Context.BuiltinFnTy;
-          valueKind = VK_RValue;
-          break;
-        }
-      }
-
-      const FunctionType *fty = type->castAs<FunctionType>();
-
-      // If we're referring to a function with an __unknown_anytype
-      // result type, make the entire expression __unknown_anytype.
-      if (fty->getReturnType() == Context.UnknownAnyTy) {
-        type = Context.UnknownAnyTy;
-        valueKind = VK_RValue;
-        break;
-      }
-
-      // Functions are l-values in C++.
-      if (getLangOpts().CPlusPlus) {
-        valueKind = VK_LValue;
-        break;
-      }
-
-      // C99 DR 316 says that, if a function type comes from a
-      // function definition (without a prototype), that type is only
-      // used for checking compatibility. Therefore, when referencing
-      // the function, we pretend that we don't have the full function
-      // type.
-      if (!cast<FunctionDecl>(VD)->hasPrototype() &&
-          isa<FunctionProtoType>(fty))
-        type = Context.getFunctionNoProtoType(fty->getReturnType(),
-                                              fty->getExtInfo());
-
-      // Functions are r-values in C.
-      valueKind = VK_RValue;
-      break;
-    }
-
-    case Decl::CXXDeductionGuide:
-      llvm_unreachable("building reference to deduction guide");
-
-    case Decl::MSProperty:
-      valueKind = VK_LValue;
-      break;
-
-    case Decl::CXXMethod:
-      // If we're referring to a method with an __unknown_anytype
-      // result type, make the entire expression __unknown_anytype.
-      // This should only be possible with a type written directly.
-      if (const FunctionProtoType *proto
-            = dyn_cast<FunctionProtoType>(VD->getType()))
-        if (proto->getReturnType() == Context.UnknownAnyTy) {
-          type = Context.UnknownAnyTy;
-          valueKind = VK_RValue;
-          break;
-        }
-
-      // C++ methods are l-values if static, r-values if non-static.
-      if (cast<CXXMethodDecl>(VD)->isStatic()) {
-        valueKind = VK_LValue;
-        break;
-      }
-      LLVM_FALLTHROUGH;
-
-    case Decl::CXXConversion:
-    case Decl::CXXDestructor:
-    case Decl::CXXConstructor:
-      valueKind = VK_RValue;
-      break;
-    }
-
-    return BuildDeclRefExpr(VD, type, valueKind, NameInfo, &SS, FoundD,
-                            TemplateArgs);
-  }
-}
-
-static void ConvertUTF8ToWideString(unsigned CharByteWidth, StringRef Source,
-                                    SmallString<32> &Target) {
-  Target.resize(CharByteWidth * (Source.size() + 1));
-  char *ResultPtr = &Target[0];
-  const llvm::UTF8 *ErrorPtr;
-  bool success =
-      llvm::ConvertUTF8toWide(CharByteWidth, Source, ResultPtr, ErrorPtr);
-  (void)success;
-  assert(success);
-  Target.resize(ResultPtr - &Target[0]);
-}
-
-ExprResult Sema::BuildPredefinedExpr(SourceLocation Loc,
-                                     PredefinedExpr::IdentKind IK) {
-  // Pick the current block, lambda, captured statement or function.
-  Decl *currentDecl = nullptr;
-  if (const BlockScopeInfo *BSI = getCurBlock())
-    currentDecl = BSI->TheDecl;
-  else if (const LambdaScopeInfo *LSI = getCurLambda())
-    currentDecl = LSI->CallOperator;
-  else if (const CapturedRegionScopeInfo *CSI = getCurCapturedRegion())
-    currentDecl = CSI->TheCapturedDecl;
-  else
-    currentDecl = getCurFunctionOrMethodDecl();
-
-  if (!currentDecl) {
-    Diag(Loc, diag::ext_predef_outside_function);
-    currentDecl = Context.getTranslationUnitDecl();
-  }
-
-  QualType ResTy;
-  StringLiteral *SL = nullptr;
-  if (cast<DeclContext>(currentDecl)->isDependentContext())
-    ResTy = Context.DependentTy;
-  else {
-    // Pre-defined identifiers are of type char[x], where x is the length of
-    // the string.
-    auto Str = PredefinedExpr::ComputeName(IK, currentDecl);
-    unsigned Length = Str.length();
-
-    llvm::APInt LengthI(32, Length + 1);
-    if (IK == PredefinedExpr::LFunction || IK == PredefinedExpr::LFuncSig) {
-      ResTy =
-          Context.adjustStringLiteralBaseType(Context.WideCharTy.withConst());
-      SmallString<32> RawChars;
-      ConvertUTF8ToWideString(Context.getTypeSizeInChars(ResTy).getQuantity(),
-                              Str, RawChars);
-      ResTy = Context.getConstantArrayType(ResTy, LengthI, ArrayType::Normal,
-                                           /*IndexTypeQuals*/ 0);
-      SL = StringLiteral::Create(Context, RawChars, StringLiteral::Wide,
-                                 /*Pascal*/ false, ResTy, Loc);
-    } else {
-      ResTy = Context.adjustStringLiteralBaseType(Context.CharTy.withConst());
-      ResTy = Context.getConstantArrayType(ResTy, LengthI, ArrayType::Normal,
-                                           /*IndexTypeQuals*/ 0);
-      SL = StringLiteral::Create(Context, Str, StringLiteral::Ascii,
-                                 /*Pascal*/ false, ResTy, Loc);
-    }
-  }
-
-  return PredefinedExpr::Create(Context, Loc, ResTy, IK, SL);
-}
-
-ExprResult Sema::ActOnPredefinedExpr(SourceLocation Loc, tok::TokenKind Kind) {
-  PredefinedExpr::IdentKind IK;
-
-  switch (Kind) {
-  default: llvm_unreachable("Unknown simple primary expr!");
-  case tok::kw___func__: IK = PredefinedExpr::Func; break; // [C99 6.4.2.2]
-  case tok::kw___FUNCTION__: IK = PredefinedExpr::Function; break;
-  case tok::kw___FUNCDNAME__: IK = PredefinedExpr::FuncDName; break; // [MS]
-  case tok::kw___FUNCSIG__: IK = PredefinedExpr::FuncSig; break; // [MS]
-  case tok::kw_L__FUNCTION__: IK = PredefinedExpr::LFunction; break; // [MS]
-  case tok::kw_L__FUNCSIG__: IK = PredefinedExpr::LFuncSig; break; // [MS]
-  case tok::kw___PRETTY_FUNCTION__: IK = PredefinedExpr::PrettyFunction; break;
-  }
-
-  return BuildPredefinedExpr(Loc, IK);
-}
-
-ExprResult Sema::ActOnCharacterConstant(const Token &Tok, Scope *UDLScope) {
-  SmallString<16> CharBuffer;
-  bool Invalid = false;
-  StringRef ThisTok = PP.getSpelling(Tok, CharBuffer, &Invalid);
-  if (Invalid)
-    return ExprError();
-
-  CharLiteralParser Literal(ThisTok.begin(), ThisTok.end(), Tok.getLocation(),
-                            PP, Tok.getKind());
-  if (Literal.hadError())
-    return ExprError();
-
-  QualType Ty;
-  if (Literal.isWide())
-    Ty = Context.WideCharTy; // L'x' -> wchar_t in C and C++.
-  else if (Literal.isUTF8() && getLangOpts().Char8)
-    Ty = Context.Char8Ty; // u8'x' -> char8_t when it exists.
-  else if (Literal.isUTF16())
-    Ty = Context.Char16Ty; // u'x' -> char16_t in C11 and C++11.
-  else if (Literal.isUTF32())
-    Ty = Context.Char32Ty; // U'x' -> char32_t in C11 and C++11.
-  else if (!getLangOpts().CPlusPlus || Literal.isMultiChar())
-    Ty = Context.IntTy;   // 'x' -> int in C, 'wxyz' -> int in C++.
-  else
-    Ty = Context.CharTy;  // 'x' -> char in C++
-
-  CharacterLiteral::CharacterKind Kind = CharacterLiteral::Ascii;
-  if (Literal.isWide())
-    Kind = CharacterLiteral::Wide;
-  else if (Literal.isUTF16())
-    Kind = CharacterLiteral::UTF16;
-  else if (Literal.isUTF32())
-    Kind = CharacterLiteral::UTF32;
-  else if (Literal.isUTF8())
-    Kind = CharacterLiteral::UTF8;
-
-  Expr *Lit = new (Context) CharacterLiteral(Literal.getValue(), Kind, Ty,
-                                             Tok.getLocation());
-
-  if (Literal.getUDSuffix().empty())
-    return Lit;
-
-  // We're building a user-defined literal.
-  IdentifierInfo *UDSuffix = &Context.Idents.get(Literal.getUDSuffix());
-  SourceLocation UDSuffixLoc =
-    getUDSuffixLoc(*this, Tok.getLocation(), Literal.getUDSuffixOffset());
-
-  // Make sure we're allowed user-defined literals here.
-  if (!UDLScope)
-    return ExprError(Diag(UDSuffixLoc, diag::err_invalid_character_udl));
-
-  // C++11 [lex.ext]p6: The literal L is treated as a call of the form
-  //   operator "" X (ch)
-  return BuildCookedLiteralOperatorCall(*this, UDLScope, UDSuffix, UDSuffixLoc,
-                                        Lit, Tok.getLocation());
-}
-
-ExprResult Sema::ActOnIntegerConstant(SourceLocation Loc, uint64_t Val) {
-  unsigned IntSize = Context.getTargetInfo().getIntWidth();
-  return IntegerLiteral::Create(Context, llvm::APInt(IntSize, Val),
-                                Context.IntTy, Loc);
-}
-
-static Expr *BuildFloatingLiteral(Sema &S, NumericLiteralParser &Literal,
-                                  QualType Ty, SourceLocation Loc) {
-  const llvm::fltSemantics &Format = S.Context.getFloatTypeSemantics(Ty);
-
-  using llvm::APFloat;
-  APFloat Val(Format);
-
-  APFloat::opStatus result = Literal.GetFloatValue(Val);
-
-  // Overflow is always an error, but underflow is only an error if
-  // we underflowed to zero (APFloat reports denormals as underflow).
-  if ((result & APFloat::opOverflow) ||
-      ((result & APFloat::opUnderflow) && Val.isZero())) {
-    unsigned diagnostic;
-    SmallString<20> buffer;
-    if (result & APFloat::opOverflow) {
-      diagnostic = diag::warn_float_overflow;
-      APFloat::getLargest(Format).toString(buffer);
-    } else {
-      diagnostic = diag::warn_float_underflow;
-      APFloat::getSmallest(Format).toString(buffer);
-    }
-
-    S.Diag(Loc, diagnostic)
-      << Ty
-      << StringRef(buffer.data(), buffer.size());
-  }
-
-  bool isExact = (result == APFloat::opOK);
-  return FloatingLiteral::Create(S.Context, Val, isExact, Ty, Loc);
-}
-
-bool Sema::CheckLoopHintExpr(Expr *E, SourceLocation Loc) {
-  assert(E && "Invalid expression");
-
-  if (E->isValueDependent())
-    return false;
-
-  QualType QT = E->getType();
-  if (!QT->isIntegerType() || QT->isBooleanType() || QT->isCharType()) {
-    Diag(E->getExprLoc(), diag::err_pragma_loop_invalid_argument_type) << QT;
-    return true;
-  }
-
-  llvm::APSInt ValueAPS;
-  ExprResult R = VerifyIntegerConstantExpression(E, &ValueAPS);
-
-  if (R.isInvalid())
-    return true;
-
-  bool ValueIsPositive = ValueAPS.isStrictlyPositive();
-  if (!ValueIsPositive || ValueAPS.getActiveBits() > 31) {
-    Diag(E->getExprLoc(), diag::err_pragma_loop_invalid_argument_value)
-        << ValueAPS.toString(10) << ValueIsPositive;
-    return true;
-  }
-
-  return false;
-}
-
-ExprResult Sema::ActOnNumericConstant(const Token &Tok, Scope *UDLScope) {
-  // Fast path for a single digit (which is quite common).  A single digit
-  // cannot have a trigraph, escaped newline, radix prefix, or suffix.
-  if (Tok.getLength() == 1) {
-    const char Val = PP.getSpellingOfSingleCharacterNumericConstant(Tok);
-    return ActOnIntegerConstant(Tok.getLocation(), Val-'0');
-  }
-
-  SmallString<128> SpellingBuffer;
-  // NumericLiteralParser wants to overread by one character.  Add padding to
-  // the buffer in case the token is copied to the buffer.  If getSpelling()
-  // returns a StringRef to the memory buffer, it should have a null char at
-  // the EOF, so it is also safe.
-  SpellingBuffer.resize(Tok.getLength() + 1);
-
-  // Get the spelling of the token, which eliminates trigraphs, etc.
-  bool Invalid = false;
-  StringRef TokSpelling = PP.getSpelling(Tok, SpellingBuffer, &Invalid);
-  if (Invalid)
-    return ExprError();
-
-  NumericLiteralParser Literal(TokSpelling, Tok.getLocation(), PP);
-  if (Literal.hadError)
-    return ExprError();
-
-  if (Literal.hasUDSuffix()) {
-    // We're building a user-defined literal.
-    IdentifierInfo *UDSuffix = &Context.Idents.get(Literal.getUDSuffix());
-    SourceLocation UDSuffixLoc =
-      getUDSuffixLoc(*this, Tok.getLocation(), Literal.getUDSuffixOffset());
-
-    // Make sure we're allowed user-defined literals here.
-    if (!UDLScope)
-      return ExprError(Diag(UDSuffixLoc, diag::err_invalid_numeric_udl));
-
-    QualType CookedTy;
-    if (Literal.isFloatingLiteral()) {
-      // C++11 [lex.ext]p4: If S contains a literal operator with parameter type
-      // long double, the literal is treated as a call of the form
-      //   operator "" X (f L)
-      CookedTy = Context.LongDoubleTy;
-    } else {
-      // C++11 [lex.ext]p3: If S contains a literal operator with parameter type
-      // unsigned long long, the literal is treated as a call of the form
-      //   operator "" X (n ULL)
-      CookedTy = Context.UnsignedLongLongTy;
-    }
-
-    DeclarationName OpName =
-      Context.DeclarationNames.getCXXLiteralOperatorName(UDSuffix);
-    DeclarationNameInfo OpNameInfo(OpName, UDSuffixLoc);
-    OpNameInfo.setCXXLiteralOperatorNameLoc(UDSuffixLoc);
-
-    SourceLocation TokLoc = Tok.getLocation();
-
-    // Perform literal operator lookup to determine if we're building a raw
-    // literal or a cooked one.
-    LookupResult R(*this, OpName, UDSuffixLoc, LookupOrdinaryName);
-    switch (LookupLiteralOperator(UDLScope, R, CookedTy,
-                                  /*AllowRaw*/ true, /*AllowTemplate*/ true,
-                                  /*AllowStringTemplate*/ false,
-                                  /*DiagnoseMissing*/ !Literal.isImaginary)) {
-    case LOLR_ErrorNoDiagnostic:
-      // Lookup failure for imaginary constants isn't fatal, there's still the
-      // GNU extension producing _Complex types.
-      break;
-    case LOLR_Error:
-      return ExprError();
-    case LOLR_Cooked: {
-      Expr *Lit;
-      if (Literal.isFloatingLiteral()) {
-        Lit = BuildFloatingLiteral(*this, Literal, CookedTy, Tok.getLocation());
-      } else {
-        llvm::APInt ResultVal(Context.getTargetInfo().getLongLongWidth(), 0);
-        if (Literal.GetIntegerValue(ResultVal))
-          Diag(Tok.getLocation(), diag::err_integer_literal_too_large)
-              << /* Unsigned */ 1;
-        Lit = IntegerLiteral::Create(Context, ResultVal, CookedTy,
-                                     Tok.getLocation());
-      }
-      return BuildLiteralOperatorCall(R, OpNameInfo, Lit, TokLoc);
-    }
-
-    case LOLR_Raw: {
-      // C++11 [lit.ext]p3, p4: If S contains a raw literal operator, the
-      // literal is treated as a call of the form
-      //   operator "" X ("n")
-      unsigned Length = Literal.getUDSuffixOffset();
-      QualType StrTy = Context.getConstantArrayType(
-          Context.adjustStringLiteralBaseType(Context.CharTy.withConst()),
-          llvm::APInt(32, Length + 1), ArrayType::Normal, 0);
-      Expr *Lit = StringLiteral::Create(
-          Context, StringRef(TokSpelling.data(), Length), StringLiteral::Ascii,
-          /*Pascal*/false, StrTy, &TokLoc, 1);
-      return BuildLiteralOperatorCall(R, OpNameInfo, Lit, TokLoc);
-    }
-
-    case LOLR_Template: {
-      // C++11 [lit.ext]p3, p4: Otherwise (S contains a literal operator
-      // template), L is treated as a call fo the form
-      //   operator "" X <'c1', 'c2', ... 'ck'>()
-      // where n is the source character sequence c1 c2 ... ck.
-      TemplateArgumentListInfo ExplicitArgs;
-      unsigned CharBits = Context.getIntWidth(Context.CharTy);
-      bool CharIsUnsigned = Context.CharTy->isUnsignedIntegerType();
-      llvm::APSInt Value(CharBits, CharIsUnsigned);
-      for (unsigned I = 0, N = Literal.getUDSuffixOffset(); I != N; ++I) {
-        Value = TokSpelling[I];
-        TemplateArgument Arg(Context, Value, Context.CharTy);
-        TemplateArgumentLocInfo ArgInfo;
-        ExplicitArgs.addArgument(TemplateArgumentLoc(Arg, ArgInfo));
-      }
-      return BuildLiteralOperatorCall(R, OpNameInfo, None, TokLoc,
-                                      &ExplicitArgs);
-    }
-    case LOLR_StringTemplate:
-      llvm_unreachable("unexpected literal operator lookup result");
-    }
-  }
-
-  Expr *Res;
-
-  if (Literal.isFixedPointLiteral()) {
-    QualType Ty;
-
-    if (Literal.isAccum) {
-      if (Literal.isHalf) {
-        Ty = Context.ShortAccumTy;
-      } else if (Literal.isLong) {
-        Ty = Context.LongAccumTy;
-      } else {
-        Ty = Context.AccumTy;
-      }
-    } else if (Literal.isFract) {
-      if (Literal.isHalf) {
-        Ty = Context.ShortFractTy;
-      } else if (Literal.isLong) {
-        Ty = Context.LongFractTy;
-      } else {
-        Ty = Context.FractTy;
-      }
-    }
-
-    if (Literal.isUnsigned) Ty = Context.getCorrespondingUnsignedType(Ty);
-
-    bool isSigned = !Literal.isUnsigned;
-    unsigned scale = Context.getFixedPointScale(Ty);
-    unsigned bit_width = Context.getTypeInfo(Ty).Width;
-
-    llvm::APInt Val(bit_width, 0, isSigned);
-    bool Overflowed = Literal.GetFixedPointValue(Val, scale);
-    bool ValIsZero = Val.isNullValue() && !Overflowed;
-
-    auto MaxVal = Context.getFixedPointMax(Ty).getValue();
-    if (Literal.isFract && Val == MaxVal + 1 && !ValIsZero)
-      // Clause 6.4.4 - The value of a constant shall be in the range of
-      // representable values for its type, with exception for constants of a
-      // fract type with a value of exactly 1; such a constant shall denote
-      // the maximal value for the type.
-      --Val;
-    else if (Val.ugt(MaxVal) || Overflowed)
-      Diag(Tok.getLocation(), diag::err_too_large_for_fixed_point);
-
-    Res = FixedPointLiteral::CreateFromRawInt(Context, Val, Ty,
-                                              Tok.getLocation(), scale);
-  } else if (Literal.isFloatingLiteral()) {
-    QualType Ty;
-    if (Literal.isHalf){
-      if (getOpenCLOptions().isEnabled("cl_khr_fp16"))
-        Ty = Context.HalfTy;
-      else {
-        Diag(Tok.getLocation(), diag::err_half_const_requires_fp16);
-        return ExprError();
-      }
-    } else if (Literal.isFloat)
-      Ty = Context.FloatTy;
-    else if (Literal.isLong)
-      Ty = Context.LongDoubleTy;
-    else if (Literal.isFloat16)
-      Ty = Context.Float16Ty;
-    else if (Literal.isFloat128)
-      Ty = Context.Float128Ty;
-    else
-      Ty = Context.DoubleTy;
-
-    Res = BuildFloatingLiteral(*this, Literal, Ty, Tok.getLocation());
-
-    if (Ty == Context.DoubleTy) {
-      if (getLangOpts().SinglePrecisionConstants) {
-        const BuiltinType *BTy = Ty->getAs<BuiltinType>();
-        if (BTy->getKind() != BuiltinType::Float) {
-          Res = ImpCastExprToType(Res, Context.FloatTy, CK_FloatingCast).get();
-        }
-      } else if (getLangOpts().OpenCL &&
-                 !getOpenCLOptions().isEnabled("cl_khr_fp64")) {
-        // Impose single-precision float type when cl_khr_fp64 is not enabled.
-        Diag(Tok.getLocation(), diag::warn_double_const_requires_fp64);
-        Res = ImpCastExprToType(Res, Context.FloatTy, CK_FloatingCast).get();
-      }
-    }
-  } else if (!Literal.isIntegerLiteral()) {
-    return ExprError();
-  } else {
-    QualType Ty;
-
-    // 'long long' is a C99 or C++11 feature.
-    if (!getLangOpts().C99 && Literal.isLongLong) {
-      if (getLangOpts().CPlusPlus)
-        Diag(Tok.getLocation(),
-             getLangOpts().CPlusPlus11 ?
-             diag::warn_cxx98_compat_longlong : diag::ext_cxx11_longlong);
-      else
-        Diag(Tok.getLocation(), diag::ext_c99_longlong);
-    }
-
-    // Get the value in the widest-possible width.
-    unsigned MaxWidth = Context.getTargetInfo().getIntMaxTWidth();
-    llvm::APInt ResultVal(MaxWidth, 0);
-
-    if (Literal.GetIntegerValue(ResultVal)) {
-      // If this value didn't fit into uintmax_t, error and force to ull.
-      Diag(Tok.getLocation(), diag::err_integer_literal_too_large)
-          << /* Unsigned */ 1;
-      Ty = Context.UnsignedLongLongTy;
-      assert(Context.getTypeSize(Ty) == ResultVal.getBitWidth() &&
-             "long long is not intmax_t?");
-    } else {
-      // If this value fits into a ULL, try to figure out what else it fits into
-      // according to the rules of C99 6.4.4.1p5.
-
-      // Octal, Hexadecimal, and integers with a U suffix are allowed to
-      // be an unsigned int.
-      bool AllowUnsigned = Literal.isUnsigned || Literal.getRadix() != 10;
-
-      // Check from smallest to largest, picking the smallest type we can.
-      unsigned Width = 0;
-
-      // Microsoft specific integer suffixes are explicitly sized.
-      if (Literal.MicrosoftInteger) {
-        if (Literal.MicrosoftInteger == 8 && !Literal.isUnsigned) {
-          Width = 8;
-          Ty = Context.CharTy;
-        } else {
-          Width = Literal.MicrosoftInteger;
-          Ty = Context.getIntTypeForBitwidth(Width,
-                                             /*Signed=*/!Literal.isUnsigned);
-        }
-      }
-
-      if (Ty.isNull() && !Literal.isLong && !Literal.isLongLong) {
-        // Are int/unsigned possibilities?
-        unsigned IntSize = Context.getTargetInfo().getIntWidth();
-
-        // Does it fit in a unsigned int?
-        if (ResultVal.isIntN(IntSize)) {
-          // Does it fit in a signed int?
-          if (!Literal.isUnsigned && ResultVal[IntSize-1] == 0)
-            Ty = Context.IntTy;
-          else if (AllowUnsigned)
-            Ty = Context.UnsignedIntTy;
-          Width = IntSize;
-        }
-      }
-
-      // Are long/unsigned long possibilities?
-      if (Ty.isNull() && !Literal.isLongLong) {
-        unsigned LongSize = Context.getTargetInfo().getLongWidth();
-
-        // Does it fit in a unsigned long?
-        if (ResultVal.isIntN(LongSize)) {
-          // Does it fit in a signed long?
-          if (!Literal.isUnsigned && ResultVal[LongSize-1] == 0)
-            Ty = Context.LongTy;
-          else if (AllowUnsigned)
-            Ty = Context.UnsignedLongTy;
-          // Check according to the rules of C90 6.1.3.2p5. C++03 [lex.icon]p2
-          // is compatible.
-          else if (!getLangOpts().C99 && !getLangOpts().CPlusPlus11) {
-            const unsigned LongLongSize =
-                Context.getTargetInfo().getLongLongWidth();
-            Diag(Tok.getLocation(),
-                 getLangOpts().CPlusPlus
-                     ? Literal.isLong
-                           ? diag::warn_old_implicitly_unsigned_long_cxx
-                           : /*C++98 UB*/ diag::
-                                 ext_old_implicitly_unsigned_long_cxx
-                     : diag::warn_old_implicitly_unsigned_long)
-                << (LongLongSize > LongSize ? /*will have type 'long long'*/ 0
-                                            : /*will be ill-formed*/ 1);
-            Ty = Context.UnsignedLongTy;
-          }
-          Width = LongSize;
-        }
-      }
-
-      // Check long long if needed.
-      if (Ty.isNull()) {
-        unsigned LongLongSize = Context.getTargetInfo().getLongLongWidth();
-
-        // Does it fit in a unsigned long long?
-        if (ResultVal.isIntN(LongLongSize)) {
-          // Does it fit in a signed long long?
-          // To be compatible with MSVC, hex integer literals ending with the
-          // LL or i64 suffix are always signed in Microsoft mode.
-          if (!Literal.isUnsigned && (ResultVal[LongLongSize-1] == 0 ||
-              (getLangOpts().MSVCCompat && Literal.isLongLong)))
-            Ty = Context.LongLongTy;
-          else if (AllowUnsigned)
-            Ty = Context.UnsignedLongLongTy;
-          Width = LongLongSize;
-        }
-      }
-
-      // If we still couldn't decide a type, we probably have something that
-      // does not fit in a signed long long, but has no U suffix.
-      if (Ty.isNull()) {
-        Diag(Tok.getLocation(), diag::ext_integer_literal_too_large_for_signed);
-        Ty = Context.UnsignedLongLongTy;
-        Width = Context.getTargetInfo().getLongLongWidth();
-      }
-
-      if (ResultVal.getBitWidth() != Width)
-        ResultVal = ResultVal.trunc(Width);
-    }
-    Res = IntegerLiteral::Create(Context, ResultVal, Ty, Tok.getLocation());
-  }
-
-  // If this is an imaginary literal, create the ImaginaryLiteral wrapper.
-  if (Literal.isImaginary) {
-    Res = new (Context) ImaginaryLiteral(Res,
-                                        Context.getComplexType(Res->getType()));
-
-    Diag(Tok.getLocation(), diag::ext_imaginary_constant);
-  }
-  return Res;
-}
-
-ExprResult Sema::ActOnParenExpr(SourceLocation L, SourceLocation R, Expr *E) {
-  assert(E && "ActOnParenExpr() missing expr");
-  return new (Context) ParenExpr(L, R, E);
-}
-
-static bool CheckVecStepTraitOperandType(Sema &S, QualType T,
-                                         SourceLocation Loc,
-                                         SourceRange ArgRange) {
-  // [OpenCL 1.1 6.11.12] "The vec_step built-in function takes a built-in
-  // scalar or vector data type argument..."
-  // Every built-in scalar type (OpenCL 1.1 6.1.1) is either an arithmetic
-  // type (C99 6.2.5p18) or void.
-  if (!(T->isArithmeticType() || T->isVoidType() || T->isVectorType())) {
-    S.Diag(Loc, diag::err_vecstep_non_scalar_vector_type)
-      << T << ArgRange;
-    return true;
-  }
-
-  assert((T->isVoidType() || !T->isIncompleteType()) &&
-         "Scalar types should always be complete");
-  return false;
-}
-
-static bool CheckExtensionTraitOperandType(Sema &S, QualType T,
-                                           SourceLocation Loc,
-                                           SourceRange ArgRange,
-                                           UnaryExprOrTypeTrait TraitKind) {
-  // Invalid types must be hard errors for SFINAE in C++.
-  if (S.LangOpts.CPlusPlus)
-    return true;
-
-  // C99 6.5.3.4p1:
-  if (T->isFunctionType() &&
-      (TraitKind == UETT_SizeOf || TraitKind == UETT_AlignOf ||
-       TraitKind == UETT_PreferredAlignOf)) {
-    // sizeof(function)/alignof(function) is allowed as an extension.
-    S.Diag(Loc, diag::ext_sizeof_alignof_function_type)
-      << TraitKind << ArgRange;
-    return false;
-  }
-
-  // Allow sizeof(void)/alignof(void) as an extension, unless in OpenCL where
-  // this is an error (OpenCL v1.1 s6.3.k)
-  if (T->isVoidType()) {
-    unsigned DiagID = S.LangOpts.OpenCL ? diag::err_opencl_sizeof_alignof_type
-                                        : diag::ext_sizeof_alignof_void_type;
-    S.Diag(Loc, DiagID) << TraitKind << ArgRange;
-    return false;
-  }
-
-  return true;
-}
-
-static bool CheckObjCTraitOperandConstraints(Sema &S, QualType T,
-                                             SourceLocation Loc,
-                                             SourceRange ArgRange,
-                                             UnaryExprOrTypeTrait TraitKind) {
-  // Reject sizeof(interface) and sizeof(interface<proto>) if the
-  // runtime doesn't allow it.
-  if (!S.LangOpts.ObjCRuntime.allowsSizeofAlignof() && T->isObjCObjectType()) {
-    S.Diag(Loc, diag::err_sizeof_nonfragile_interface)
-      << T << (TraitKind == UETT_SizeOf)
-      << ArgRange;
-    return true;
-  }
-
-  return false;
-}
-
-/// Check whether E is a pointer from a decayed array type (the decayed
-/// pointer type is equal to T) and emit a warning if it is.
-static void warnOnSizeofOnArrayDecay(Sema &S, SourceLocation Loc, QualType T,
-                                     Expr *E) {
-  // Don't warn if the operation changed the type.
-  if (T != E->getType())
-    return;
-
-  // Now look for array decays.
-  ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E);
-  if (!ICE || ICE->getCastKind() != CK_ArrayToPointerDecay)
-    return;
-
-  S.Diag(Loc, diag::warn_sizeof_array_decay) << ICE->getSourceRange()
-                                             << ICE->getType()
-                                             << ICE->getSubExpr()->getType();
-}
-
-/// Check the constraints on expression operands to unary type expression
-/// and type traits.
-///
-/// Completes any types necessary and validates the constraints on the operand
-/// expression. The logic mostly mirrors the type-based overload, but may modify
-/// the expression as it completes the type for that expression through template
-/// instantiation, etc.
-bool Sema::CheckUnaryExprOrTypeTraitOperand(Expr *E,
-                                            UnaryExprOrTypeTrait ExprKind) {
-  QualType ExprTy = E->getType();
-  assert(!ExprTy->isReferenceType());
-
-  if (ExprKind == UETT_VecStep)
-    return CheckVecStepTraitOperandType(*this, ExprTy, E->getExprLoc(),
-                                        E->getSourceRange());
-
-  // Whitelist some types as extensions
-  if (!CheckExtensionTraitOperandType(*this, ExprTy, E->getExprLoc(),
-                                      E->getSourceRange(), ExprKind))
-    return false;
-
-  // 'alignof' applied to an expression only requires the base element type of
-  // the expression to be complete. 'sizeof' requires the expression's type to
-  // be complete (and will attempt to complete it if it's an array of unknown
-  // bound).
-  if (ExprKind == UETT_AlignOf || ExprKind == UETT_PreferredAlignOf) {
-    if (RequireCompleteType(E->getExprLoc(),
-                            Context.getBaseElementType(E->getType()),
-                            diag::err_sizeof_alignof_incomplete_type, ExprKind,
-                            E->getSourceRange()))
-      return true;
-  } else {
-    if (RequireCompleteExprType(E, diag::err_sizeof_alignof_incomplete_type,
-                                ExprKind, E->getSourceRange()))
-      return true;
-  }
-
-  // Completing the expression's type may have changed it.
-  ExprTy = E->getType();
-  assert(!ExprTy->isReferenceType());
-
-  if (ExprTy->isFunctionType()) {
-    Diag(E->getExprLoc(), diag::err_sizeof_alignof_function_type)
-      << ExprKind << E->getSourceRange();
-    return true;
-  }
-
-  // The operand for sizeof and alignof is in an unevaluated expression context,
-  // so side effects could result in unintended consequences.
-  if ((ExprKind == UETT_SizeOf || ExprKind == UETT_AlignOf ||
-       ExprKind == UETT_PreferredAlignOf) &&
-      !inTemplateInstantiation() && E->HasSideEffects(Context, false))
-    Diag(E->getExprLoc(), diag::warn_side_effects_unevaluated_context);
-
-  if (CheckObjCTraitOperandConstraints(*this, ExprTy, E->getExprLoc(),
-                                       E->getSourceRange(), ExprKind))
-    return true;
-
-  if (ExprKind == UETT_SizeOf) {
-    if (DeclRefExpr *DeclRef = dyn_cast<DeclRefExpr>(E->IgnoreParens())) {
-      if (ParmVarDecl *PVD = dyn_cast<ParmVarDecl>(DeclRef->getFoundDecl())) {
-        QualType OType = PVD->getOriginalType();
-        QualType Type = PVD->getType();
-        if (Type->isPointerType() && OType->isArrayType()) {
-          Diag(E->getExprLoc(), diag::warn_sizeof_array_param)
-            << Type << OType;
-          Diag(PVD->getLocation(), diag::note_declared_at);
-        }
-      }
-    }
-
-    // Warn on "sizeof(array op x)" and "sizeof(x op array)", where the array
-    // decays into a pointer and returns an unintended result. This is most
-    // likely a typo for "sizeof(array) op x".
-    if (BinaryOperator *BO = dyn_cast<BinaryOperator>(E->IgnoreParens())) {
-      warnOnSizeofOnArrayDecay(*this, BO->getOperatorLoc(), BO->getType(),
-                               BO->getLHS());
-      warnOnSizeofOnArrayDecay(*this, BO->getOperatorLoc(), BO->getType(),
-                               BO->getRHS());
-    }
-  }
-
-  return false;
-}
-
-/// Check the constraints on operands to unary expression and type
-/// traits.
-///
-/// This will complete any types necessary, and validate the various constraints
-/// on those operands.
-///
-/// The UsualUnaryConversions() function is *not* called by this routine.
-/// C99 6.3.2.1p[2-4] all state:
-///   Except when it is the operand of the sizeof operator ...
-///
-/// C++ [expr.sizeof]p4
-///   The lvalue-to-rvalue, array-to-pointer, and function-to-pointer
-///   standard conversions are not applied to the operand of sizeof.
-///
-/// This policy is followed for all of the unary trait expressions.
-bool Sema::CheckUnaryExprOrTypeTraitOperand(QualType ExprType,
-                                            SourceLocation OpLoc,
-                                            SourceRange ExprRange,
-                                            UnaryExprOrTypeTrait ExprKind) {
-  if (ExprType->isDependentType())
-    return false;
-
-  // C++ [expr.sizeof]p2:
-  //     When applied to a reference or a reference type, the result
-  //     is the size of the referenced type.
-  // C++11 [expr.alignof]p3:
-  //     When alignof is applied to a reference type, the result
-  //     shall be the alignment of the referenced type.
-  if (const ReferenceType *Ref = ExprType->getAs<ReferenceType>())
-    ExprType = Ref->getPointeeType();
-
-  // C11 6.5.3.4/3, C++11 [expr.alignof]p3:
-  //   When alignof or _Alignof is applied to an array type, the result
-  //   is the alignment of the element type.
-  if (ExprKind == UETT_AlignOf || ExprKind == UETT_PreferredAlignOf ||
-      ExprKind == UETT_OpenMPRequiredSimdAlign)
-    ExprType = Context.getBaseElementType(ExprType);
-
-  if (ExprKind == UETT_VecStep)
-    return CheckVecStepTraitOperandType(*this, ExprType, OpLoc, ExprRange);
-
-  // Whitelist some types as extensions
-  if (!CheckExtensionTraitOperandType(*this, ExprType, OpLoc, ExprRange,
-                                      ExprKind))
-    return false;
-
-  if (RequireCompleteType(OpLoc, ExprType,
-                          diag::err_sizeof_alignof_incomplete_type,
-                          ExprKind, ExprRange))
-    return true;
-
-  if (ExprType->isFunctionType()) {
-    Diag(OpLoc, diag::err_sizeof_alignof_function_type)
-      << ExprKind << ExprRange;
-    return true;
-  }
-
-  if (CheckObjCTraitOperandConstraints(*this, ExprType, OpLoc, ExprRange,
-                                       ExprKind))
-    return true;
-
-  return false;
-}
-
-static bool CheckAlignOfExpr(Sema &S, Expr *E, UnaryExprOrTypeTrait ExprKind) {
-  E = E->IgnoreParens();
-
-  // Cannot know anything else if the expression is dependent.
-  if (E->isTypeDependent())
-    return false;
-
-  if (E->getObjectKind() == OK_BitField) {
-    S.Diag(E->getExprLoc(), diag::err_sizeof_alignof_typeof_bitfield)
-       << 1 << E->getSourceRange();
-    return true;
-  }
-
-  ValueDecl *D = nullptr;
-  if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E)) {
-    D = DRE->getDecl();
-  } else if (MemberExpr *ME = dyn_cast<MemberExpr>(E)) {
-    D = ME->getMemberDecl();
-  }
-
-  // If it's a field, require the containing struct to have a
-  // complete definition so that we can compute the layout.
-  //
-  // This can happen in C++11 onwards, either by naming the member
-  // in a way that is not transformed into a member access expression
-  // (in an unevaluated operand, for instance), or by naming the member
-  // in a trailing-return-type.
-  //
-  // For the record, since __alignof__ on expressions is a GCC
-  // extension, GCC seems to permit this but always gives the
-  // nonsensical answer 0.
-  //
-  // We don't really need the layout here --- we could instead just
-  // directly check for all the appropriate alignment-lowing
-  // attributes --- but that would require duplicating a lot of
-  // logic that just isn't worth duplicating for such a marginal
-  // use-case.
-  if (FieldDecl *FD = dyn_cast_or_null<FieldDecl>(D)) {
-    // Fast path this check, since we at least know the record has a
-    // definition if we can find a member of it.
-    if (!FD->getParent()->isCompleteDefinition()) {
-      S.Diag(E->getExprLoc(), diag::err_alignof_member_of_incomplete_type)
-        << E->getSourceRange();
-      return true;
-    }
-
-    // Otherwise, if it's a field, and the field doesn't have
-    // reference type, then it must have a complete type (or be a
-    // flexible array member, which we explicitly want to
-    // white-list anyway), which makes the following checks trivial.
-    if (!FD->getType()->isReferenceType())
-      return false;
-  }
-
-  return S.CheckUnaryExprOrTypeTraitOperand(E, ExprKind);
-}
-
-bool Sema::CheckVecStepExpr(Expr *E) {
-  E = E->IgnoreParens();
-
-  // Cannot know anything else if the expression is dependent.
-  if (E->isTypeDependent())
-    return false;
-
-  return CheckUnaryExprOrTypeTraitOperand(E, UETT_VecStep);
-}
-
-static void captureVariablyModifiedType(ASTContext &Context, QualType T,
-                                        CapturingScopeInfo *CSI) {
-  assert(T->isVariablyModifiedType());
-  assert(CSI != nullptr);
-
-  // We're going to walk down into the type and look for VLA expressions.
-  do {
-    const Type *Ty = T.getTypePtr();
-    switch (Ty->getTypeClass()) {
-#define TYPE(Class, Base)
-#define ABSTRACT_TYPE(Class, Base)
-#define NON_CANONICAL_TYPE(Class, Base)
-#define DEPENDENT_TYPE(Class, Base) case Type::Class:
-#define NON_CANONICAL_UNLESS_DEPENDENT_TYPE(Class, Base)
-#include "clang/AST/TypeNodes.def"
-      T = QualType();
-      break;
-    // These types are never variably-modified.
-    case Type::Builtin:
-    case Type::Complex:
-    case Type::Vector:
-    case Type::ExtVector:
-    case Type::Record:
-    case Type::Enum:
-    case Type::Elaborated:
-    case Type::TemplateSpecialization:
-    case Type::ObjCObject:
-    case Type::ObjCInterface:
-    case Type::ObjCObjectPointer:
-    case Type::ObjCTypeParam:
-    case Type::Pipe:
-      llvm_unreachable("type class is never variably-modified!");
-    case Type::Adjusted:
-      T = cast<AdjustedType>(Ty)->getOriginalType();
-      break;
-    case Type::Decayed:
-      T = cast<DecayedType>(Ty)->getPointeeType();
-      break;
-    case Type::Pointer:
-      T = cast<PointerType>(Ty)->getPointeeType();
-      break;
-    case Type::BlockPointer:
-      T = cast<BlockPointerType>(Ty)->getPointeeType();
-      break;
-    case Type::LValueReference:
-    case Type::RValueReference:
-      T = cast<ReferenceType>(Ty)->getPointeeType();
-      break;
-    case Type::MemberPointer:
-      T = cast<MemberPointerType>(Ty)->getPointeeType();
-      break;
-    case Type::ConstantArray:
-    case Type::IncompleteArray:
-      // Losing element qualification here is fine.
-      T = cast<ArrayType>(Ty)->getElementType();
-      break;
-    case Type::VariableArray: {
-      // Losing element qualification here is fine.
-      const VariableArrayType *VAT = cast<VariableArrayType>(Ty);
-
-      // Unknown size indication requires no size computation.
-      // Otherwise, evaluate and record it.
-      if (auto Size = VAT->getSizeExpr()) {
-        if (!CSI->isVLATypeCaptured(VAT)) {
-          RecordDecl *CapRecord = nullptr;
-          if (auto LSI = dyn_cast<LambdaScopeInfo>(CSI)) {
-            CapRecord = LSI->Lambda;
-          } else if (auto CRSI = dyn_cast<CapturedRegionScopeInfo>(CSI)) {
-            CapRecord = CRSI->TheRecordDecl;
-          }
-          if (CapRecord) {
-            auto ExprLoc = Size->getExprLoc();
-            auto SizeType = Context.getSizeType();
-            // Build the non-static data member.
-            auto Field =
-                FieldDecl::Create(Context, CapRecord, ExprLoc, ExprLoc,
-                                  /*Id*/ nullptr, SizeType, /*TInfo*/ nullptr,
-                                  /*BW*/ nullptr, /*Mutable*/ false,
-                                  /*InitStyle*/ ICIS_NoInit);
-            Field->setImplicit(true);
-            Field->setAccess(AS_private);
-            Field->setCapturedVLAType(VAT);
-            CapRecord->addDecl(Field);
-
-            CSI->addVLATypeCapture(ExprLoc, SizeType);
-          }
-        }
-      }
-      T = VAT->getElementType();
-      break;
-    }
-    case Type::FunctionProto:
-    case Type::FunctionNoProto:
-      T = cast<FunctionType>(Ty)->getReturnType();
-      break;
-    case Type::Paren:
-    case Type::TypeOf:
-    case Type::UnaryTransform:
-    case Type::Attributed:
-    case Type::SubstTemplateTypeParm:
-    case Type::PackExpansion:
-      // Keep walking after single level desugaring.
-      T = T.getSingleStepDesugaredType(Context);
-      break;
-    case Type::Typedef:
-      T = cast<TypedefType>(Ty)->desugar();
-      break;
-    case Type::Decltype:
-      T = cast<DecltypeType>(Ty)->desugar();
-      break;
-    case Type::Auto:
-    case Type::DeducedTemplateSpecialization:
-      T = cast<DeducedType>(Ty)->getDeducedType();
-      break;
-    case Type::TypeOfExpr:
-      T = cast<TypeOfExprType>(Ty)->getUnderlyingExpr()->getType();
-      break;
-    case Type::Atomic:
-      T = cast<AtomicType>(Ty)->getValueType();
-      break;
-    }
-  } while (!T.isNull() && T->isVariablyModifiedType());
-}
-
-/// Build a sizeof or alignof expression given a type operand.
-ExprResult
-Sema::CreateUnaryExprOrTypeTraitExpr(TypeSourceInfo *TInfo,
-                                     SourceLocation OpLoc,
-                                     UnaryExprOrTypeTrait ExprKind,
-                                     SourceRange R) {
-  if (!TInfo)
-    return ExprError();
-
-  QualType T = TInfo->getType();
-
-  if (!T->isDependentType() &&
-      CheckUnaryExprOrTypeTraitOperand(T, OpLoc, R, ExprKind))
-    return ExprError();
-
-  if (T->isVariablyModifiedType() && FunctionScopes.size() > 1) {
-    if (auto *TT = T->getAs<TypedefType>()) {
-      for (auto I = FunctionScopes.rbegin(),
-                E = std::prev(FunctionScopes.rend());
-           I != E; ++I) {
-        auto *CSI = dyn_cast<CapturingScopeInfo>(*I);
-        if (CSI == nullptr)
-          break;
-        DeclContext *DC = nullptr;
-        if (auto *LSI = dyn_cast<LambdaScopeInfo>(CSI))
-          DC = LSI->CallOperator;
-        else if (auto *CRSI = dyn_cast<CapturedRegionScopeInfo>(CSI))
-          DC = CRSI->TheCapturedDecl;
-        else if (auto *BSI = dyn_cast<BlockScopeInfo>(CSI))
-          DC = BSI->TheDecl;
-        if (DC) {
-          if (DC->containsDecl(TT->getDecl()))
-            break;
-          captureVariablyModifiedType(Context, T, CSI);
-        }
-      }
-    }
-  }
-
-  // C99 6.5.3.4p4: the type (an unsigned integer type) is size_t.
-  return new (Context) UnaryExprOrTypeTraitExpr(
-      ExprKind, TInfo, Context.getSizeType(), OpLoc, R.getEnd());
-}
-
-/// Build a sizeof or alignof expression given an expression
-/// operand.
-ExprResult
-Sema::CreateUnaryExprOrTypeTraitExpr(Expr *E, SourceLocation OpLoc,
-                                     UnaryExprOrTypeTrait ExprKind) {
-  ExprResult PE = CheckPlaceholderExpr(E);
-  if (PE.isInvalid())
-    return ExprError();
-
-  E = PE.get();
-
-  // Verify that the operand is valid.
-  bool isInvalid = false;
-  if (E->isTypeDependent()) {
-    // Delay type-checking for type-dependent expressions.
-  } else if (ExprKind == UETT_AlignOf || ExprKind == UETT_PreferredAlignOf) {
-    isInvalid = CheckAlignOfExpr(*this, E, ExprKind);
-  } else if (ExprKind == UETT_VecStep) {
-    isInvalid = CheckVecStepExpr(E);
-  } else if (ExprKind == UETT_OpenMPRequiredSimdAlign) {
-      Diag(E->getExprLoc(), diag::err_openmp_default_simd_align_expr);
-      isInvalid = true;
-  } else if (E->refersToBitField()) {  // C99 6.5.3.4p1.
-    Diag(E->getExprLoc(), diag::err_sizeof_alignof_typeof_bitfield) << 0;
-    isInvalid = true;
-  } else {
-    isInvalid = CheckUnaryExprOrTypeTraitOperand(E, UETT_SizeOf);
-  }
-
-  if (isInvalid)
-    return ExprError();
-
-  if (ExprKind == UETT_SizeOf && E->getType()->isVariableArrayType()) {
-    PE = TransformToPotentiallyEvaluated(E);
-    if (PE.isInvalid()) return ExprError();
-    E = PE.get();
-  }
-
-  // C99 6.5.3.4p4: the type (an unsigned integer type) is size_t.
-  return new (Context) UnaryExprOrTypeTraitExpr(
-      ExprKind, E, Context.getSizeType(), OpLoc, E->getSourceRange().getEnd());
-}
-
-/// ActOnUnaryExprOrTypeTraitExpr - Handle @c sizeof(type) and @c sizeof @c
-/// expr and the same for @c alignof and @c __alignof
-/// Note that the ArgRange is invalid if isType is false.
-ExprResult
-Sema::ActOnUnaryExprOrTypeTraitExpr(SourceLocation OpLoc,
-                                    UnaryExprOrTypeTrait ExprKind, bool IsType,
-                                    void *TyOrEx, SourceRange ArgRange) {
-  // If error parsing type, ignore.
-  if (!TyOrEx) return ExprError();
-
-  if (IsType) {
-    TypeSourceInfo *TInfo;
-    (void) GetTypeFromParser(ParsedType::getFromOpaquePtr(TyOrEx), &TInfo);
-    return CreateUnaryExprOrTypeTraitExpr(TInfo, OpLoc, ExprKind, ArgRange);
-  }
-
-  Expr *ArgEx = (Expr *)TyOrEx;
-  ExprResult Result = CreateUnaryExprOrTypeTraitExpr(ArgEx, OpLoc, ExprKind);
-  return Result;
-}
-
-static QualType CheckRealImagOperand(Sema &S, ExprResult &V, SourceLocation Loc,
-                                     bool IsReal) {
-  if (V.get()->isTypeDependent())
-    return S.Context.DependentTy;
-
-  // _Real and _Imag are only l-values for normal l-values.
-  if (V.get()->getObjectKind() != OK_Ordinary) {
-    V = S.DefaultLvalueConversion(V.get());
-    if (V.isInvalid())
-      return QualType();
-  }
-
-  // These operators return the element type of a complex type.
-  if (const ComplexType *CT = V.get()->getType()->getAs<ComplexType>())
-    return CT->getElementType();
-
-  // Otherwise they pass through real integer and floating point types here.
-  if (V.get()->getType()->isArithmeticType())
-    return V.get()->getType();
-
-  // Test for placeholders.
-  ExprResult PR = S.CheckPlaceholderExpr(V.get());
-  if (PR.isInvalid()) return QualType();
-  if (PR.get() != V.get()) {
-    V = PR;
-    return CheckRealImagOperand(S, V, Loc, IsReal);
-  }
-
-  // Reject anything else.
-  S.Diag(Loc, diag::err_realimag_invalid_type) << V.get()->getType()
-    << (IsReal ? "__real" : "__imag");
-  return QualType();
-}
-
-
-
-ExprResult
-Sema::ActOnPostfixUnaryOp(Scope *S, SourceLocation OpLoc,
-                          tok::TokenKind Kind, Expr *Input) {
-  UnaryOperatorKind Opc;
-  switch (Kind) {
-  default: llvm_unreachable("Unknown unary op!");
-  case tok::plusplus:   Opc = UO_PostInc; break;
-  case tok::minusminus: Opc = UO_PostDec; break;
-  }
-
-  // Since this might is a postfix expression, get rid of ParenListExprs.
-  ExprResult Result = MaybeConvertParenListExprToParenExpr(S, Input);
-  if (Result.isInvalid()) return ExprError();
-  Input = Result.get();
-
-  return BuildUnaryOp(S, OpLoc, Opc, Input);
-}
-
-/// Diagnose if arithmetic on the given ObjC pointer is illegal.
-///
-/// \return true on error
-static bool checkArithmeticOnObjCPointer(Sema &S,
-                                         SourceLocation opLoc,
-                                         Expr *op) {
-  assert(op->getType()->isObjCObjectPointerType());
-  if (S.LangOpts.ObjCRuntime.allowsPointerArithmetic() &&
-      !S.LangOpts.ObjCSubscriptingLegacyRuntime)
-    return false;
-
-  S.Diag(opLoc, diag::err_arithmetic_nonfragile_interface)
-    << op->getType()->castAs<ObjCObjectPointerType>()->getPointeeType()
-    << op->getSourceRange();
-  return true;
-}
-
-static bool isMSPropertySubscriptExpr(Sema &S, Expr *Base) {
-  auto *BaseNoParens = Base->IgnoreParens();
-  if (auto *MSProp = dyn_cast<MSPropertyRefExpr>(BaseNoParens))
-    return MSProp->getPropertyDecl()->getType()->isArrayType();
-  return isa<MSPropertySubscriptExpr>(BaseNoParens);
-}
-
-ExprResult
-Sema::ActOnArraySubscriptExpr(Scope *S, Expr *base, SourceLocation lbLoc,
-                              Expr *idx, SourceLocation rbLoc) {
-  if (base && !base->getType().isNull() &&
-      base->getType()->isSpecificPlaceholderType(BuiltinType::OMPArraySection))
-    return ActOnOMPArraySectionExpr(base, lbLoc, idx, SourceLocation(),
-                                    /*Length=*/nullptr, rbLoc);
-
-  // Since this might be a postfix expression, get rid of ParenListExprs.
-  if (isa<ParenListExpr>(base)) {
-    ExprResult result = MaybeConvertParenListExprToParenExpr(S, base);
-    if (result.isInvalid()) return ExprError();
-    base = result.get();
-  }
-
-  // Handle any non-overload placeholder types in the base and index
-  // expressions.  We can't handle overloads here because the other
-  // operand might be an overloadable type, in which case the overload
-  // resolution for the operator overload should get the first crack
-  // at the overload.
-  bool IsMSPropertySubscript = false;
-  if (base->getType()->isNonOverloadPlaceholderType()) {
-    IsMSPropertySubscript = isMSPropertySubscriptExpr(*this, base);
-    if (!IsMSPropertySubscript) {
-      ExprResult result = CheckPlaceholderExpr(base);
-      if (result.isInvalid())
-        return ExprError();
-      base = result.get();
-    }
-  }
-  if (idx->getType()->isNonOverloadPlaceholderType()) {
-    ExprResult result = CheckPlaceholderExpr(idx);
-    if (result.isInvalid()) return ExprError();
-    idx = result.get();
-  }
-
-  // Build an unanalyzed expression if either operand is type-dependent.
-  if (getLangOpts().CPlusPlus &&
-      (base->isTypeDependent() || idx->isTypeDependent())) {
-    return new (Context) ArraySubscriptExpr(base, idx, Context.DependentTy,
-                                            VK_LValue, OK_Ordinary, rbLoc);
-  }
-
-  // MSDN, property (C++)
-  // https://msdn.microsoft.com/en-us/library/yhfk0thd(v=vs.120).aspx
-  // This attribute can also be used in the declaration of an empty array in a
-  // class or structure definition. For example:
-  // __declspec(property(get=GetX, put=PutX)) int x[];
-  // The above statement indicates that x[] can be used with one or more array
-  // indices. In this case, i=p->x[a][b] will be turned into i=p->GetX(a, b),
-  // and p->x[a][b] = i will be turned into p->PutX(a, b, i);
-  if (IsMSPropertySubscript) {
-    // Build MS property subscript expression if base is MS property reference
-    // or MS property subscript.
-    return new (Context) MSPropertySubscriptExpr(
-        base, idx, Context.PseudoObjectTy, VK_LValue, OK_Ordinary, rbLoc);
-  }
-
-  // Use C++ overloaded-operator rules if either operand has record
-  // type.  The spec says to do this if either type is *overloadable*,
-  // but enum types can't declare subscript operators or conversion
-  // operators, so there's nothing interesting for overload resolution
-  // to do if there aren't any record types involved.
-  //
-  // ObjC pointers have their own subscripting logic that is not tied
-  // to overload resolution and so should not take this path.
-  if (getLangOpts().CPlusPlus &&
-      (base->getType()->isRecordType() ||
-       (!base->getType()->isObjCObjectPointerType() &&
-        idx->getType()->isRecordType()))) {
-    return CreateOverloadedArraySubscriptExpr(lbLoc, rbLoc, base, idx);
-  }
-
-  ExprResult Res = CreateBuiltinArraySubscriptExpr(base, lbLoc, idx, rbLoc);
-
-  if (!Res.isInvalid() && isa<ArraySubscriptExpr>(Res.get()))
-    CheckSubscriptAccessOfNoDeref(cast<ArraySubscriptExpr>(Res.get()));
-
-  return Res;
-}
-
-void Sema::CheckAddressOfNoDeref(const Expr *E) {
-  ExpressionEvaluationContextRecord &LastRecord = ExprEvalContexts.back();
-  const Expr *StrippedExpr = E->IgnoreParenImpCasts();
-
-  // For expressions like `&(*s).b`, the base is recorded and what should be
-  // checked.
-  const MemberExpr *Member = nullptr;
-  while ((Member = dyn_cast<MemberExpr>(StrippedExpr)) && !Member->isArrow())
-    StrippedExpr = Member->getBase()->IgnoreParenImpCasts();
-
-  LastRecord.PossibleDerefs.erase(StrippedExpr);
-}
-
-void Sema::CheckSubscriptAccessOfNoDeref(const ArraySubscriptExpr *E) {
-  QualType ResultTy = E->getType();
-  ExpressionEvaluationContextRecord &LastRecord = ExprEvalContexts.back();
-
-  // Bail if the element is an array since it is not memory access.
-  if (isa<ArrayType>(ResultTy))
-    return;
-
-  if (ResultTy->hasAttr(attr::NoDeref)) {
-    LastRecord.PossibleDerefs.insert(E);
-    return;
-  }
-
-  // Check if the base type is a pointer to a member access of a struct
-  // marked with noderef.
-  const Expr *Base = E->getBase();
-  QualType BaseTy = Base->getType();
-  if (!(isa<ArrayType>(BaseTy) || isa<PointerType>(BaseTy)))
-    // Not a pointer access
-    return;
-
-  const MemberExpr *Member = nullptr;
-  while ((Member = dyn_cast<MemberExpr>(Base->IgnoreParenCasts())) &&
-         Member->isArrow())
-    Base = Member->getBase();
-
-  if (const auto *Ptr = dyn_cast<PointerType>(Base->getType())) {
-    if (Ptr->getPointeeType()->hasAttr(attr::NoDeref))
-      LastRecord.PossibleDerefs.insert(E);
-  }
-}
-
-ExprResult Sema::ActOnOMPArraySectionExpr(Expr *Base, SourceLocation LBLoc,
-                                          Expr *LowerBound,
-                                          SourceLocation ColonLoc, Expr *Length,
-                                          SourceLocation RBLoc) {
-  if (Base->getType()->isPlaceholderType() &&
-      !Base->getType()->isSpecificPlaceholderType(
-          BuiltinType::OMPArraySection)) {
-    ExprResult Result = CheckPlaceholderExpr(Base);
-    if (Result.isInvalid())
-      return ExprError();
-    Base = Result.get();
-  }
-  if (LowerBound && LowerBound->getType()->isNonOverloadPlaceholderType()) {
-    ExprResult Result = CheckPlaceholderExpr(LowerBound);
-    if (Result.isInvalid())
-      return ExprError();
-    Result = DefaultLvalueConversion(Result.get());
-    if (Result.isInvalid())
-      return ExprError();
-    LowerBound = Result.get();
-  }
-  if (Length && Length->getType()->isNonOverloadPlaceholderType()) {
-    ExprResult Result = CheckPlaceholderExpr(Length);
-    if (Result.isInvalid())
-      return ExprError();
-    Result = DefaultLvalueConversion(Result.get());
-    if (Result.isInvalid())
-      return ExprError();
-    Length = Result.get();
-  }
-
-  // Build an unanalyzed expression if either operand is type-dependent.
-  if (Base->isTypeDependent() ||
-      (LowerBound &&
-       (LowerBound->isTypeDependent() || LowerBound->isValueDependent())) ||
-      (Length && (Length->isTypeDependent() || Length->isValueDependent()))) {
-    return new (Context)
-        OMPArraySectionExpr(Base, LowerBound, Length, Context.DependentTy,
-                            VK_LValue, OK_Ordinary, ColonLoc, RBLoc);
-  }
-
-  // Perform default conversions.
-  QualType OriginalTy = OMPArraySectionExpr::getBaseOriginalType(Base);
-  QualType ResultTy;
-  if (OriginalTy->isAnyPointerType()) {
-    ResultTy = OriginalTy->getPointeeType();
-  } else if (OriginalTy->isArrayType()) {
-    ResultTy = OriginalTy->getAsArrayTypeUnsafe()->getElementType();
-  } else {
-    return ExprError(
-        Diag(Base->getExprLoc(), diag::err_omp_typecheck_section_value)
-        << Base->getSourceRange());
-  }
-  // C99 6.5.2.1p1
-  if (LowerBound) {
-    auto Res = PerformOpenMPImplicitIntegerConversion(LowerBound->getExprLoc(),
-                                                      LowerBound);
-    if (Res.isInvalid())
-      return ExprError(Diag(LowerBound->getExprLoc(),
-                            diag::err_omp_typecheck_section_not_integer)
-                       << 0 << LowerBound->getSourceRange());
-    LowerBound = Res.get();
-
-    if (LowerBound->getType()->isSpecificBuiltinType(BuiltinType::Char_S) ||
-        LowerBound->getType()->isSpecificBuiltinType(BuiltinType::Char_U))
-      Diag(LowerBound->getExprLoc(), diag::warn_omp_section_is_char)
-          << 0 << LowerBound->getSourceRange();
-  }
-  if (Length) {
-    auto Res =
-        PerformOpenMPImplicitIntegerConversion(Length->getExprLoc(), Length);
-    if (Res.isInvalid())
-      return ExprError(Diag(Length->getExprLoc(),
-                            diag::err_omp_typecheck_section_not_integer)
-                       << 1 << Length->getSourceRange());
-    Length = Res.get();
-
-    if (Length->getType()->isSpecificBuiltinType(BuiltinType::Char_S) ||
-        Length->getType()->isSpecificBuiltinType(BuiltinType::Char_U))
-      Diag(Length->getExprLoc(), diag::warn_omp_section_is_char)
-          << 1 << Length->getSourceRange();
-  }
-
-  // C99 6.5.2.1p1: "shall have type "pointer to *object* type". Similarly,
-  // C++ [expr.sub]p1: The type "T" shall be a completely-defined object
-  // type. Note that functions are not objects, and that (in C99 parlance)
-  // incomplete types are not object types.
-  if (ResultTy->isFunctionType()) {
-    Diag(Base->getExprLoc(), diag::err_omp_section_function_type)
-        << ResultTy << Base->getSourceRange();
-    return ExprError();
-  }
-
-  if (RequireCompleteType(Base->getExprLoc(), ResultTy,
-                          diag::err_omp_section_incomplete_type, Base))
-    return ExprError();
-
-  if (LowerBound && !OriginalTy->isAnyPointerType()) {
-    Expr::EvalResult Result;
-    if (LowerBound->EvaluateAsInt(Result, Context)) {
-      // OpenMP 4.5, [2.4 Array Sections]
-      // The array section must be a subset of the original array.
-      llvm::APSInt LowerBoundValue = Result.Val.getInt();
-      if (LowerBoundValue.isNegative()) {
-        Diag(LowerBound->getExprLoc(), diag::err_omp_section_not_subset_of_array)
-            << LowerBound->getSourceRange();
-        return ExprError();
-      }
-    }
-  }
-
-  if (Length) {
-    Expr::EvalResult Result;
-    if (Length->EvaluateAsInt(Result, Context)) {
-      // OpenMP 4.5, [2.4 Array Sections]
-      // The length must evaluate to non-negative integers.
-      llvm::APSInt LengthValue = Result.Val.getInt();
-      if (LengthValue.isNegative()) {
-        Diag(Length->getExprLoc(), diag::err_omp_section_length_negative)
-            << LengthValue.toString(/*Radix=*/10, /*Signed=*/true)
-            << Length->getSourceRange();
-        return ExprError();
-      }
-    }
-  } else if (ColonLoc.isValid() &&
-             (OriginalTy.isNull() || (!OriginalTy->isConstantArrayType() &&
-                                      !OriginalTy->isVariableArrayType()))) {
-    // OpenMP 4.5, [2.4 Array Sections]
-    // When the size of the array dimension is not known, the length must be
-    // specified explicitly.
-    Diag(ColonLoc, diag::err_omp_section_length_undefined)
-        << (!OriginalTy.isNull() && OriginalTy->isArrayType());
-    return ExprError();
-  }
-
-  if (!Base->getType()->isSpecificPlaceholderType(
-          BuiltinType::OMPArraySection)) {
-    ExprResult Result = DefaultFunctionArrayLvalueConversion(Base);
-    if (Result.isInvalid())
-      return ExprError();
-    Base = Result.get();
-  }
-  return new (Context)
-      OMPArraySectionExpr(Base, LowerBound, Length, Context.OMPArraySectionTy,
-                          VK_LValue, OK_Ordinary, ColonLoc, RBLoc);
-}
-
-ExprResult
-Sema::CreateBuiltinArraySubscriptExpr(Expr *Base, SourceLocation LLoc,
-                                      Expr *Idx, SourceLocation RLoc) {
-  Expr *LHSExp = Base;
-  Expr *RHSExp = Idx;
-
-  ExprValueKind VK = VK_LValue;
-  ExprObjectKind OK = OK_Ordinary;
-
-  // Per C++ core issue 1213, the result is an xvalue if either operand is
-  // a non-lvalue array, and an lvalue otherwise.
-  if (getLangOpts().CPlusPlus11) {
-    for (auto *Op : {LHSExp, RHSExp}) {
-      Op = Op->IgnoreImplicit();
-      if (Op->getType()->isArrayType() && !Op->isLValue())
-        VK = VK_XValue;
-    }
-  }
-
-  // Perform default conversions.
-  if (!LHSExp->getType()->getAs<VectorType>()) {
-    ExprResult Result = DefaultFunctionArrayLvalueConversion(LHSExp);
-    if (Result.isInvalid())
-      return ExprError();
-    LHSExp = Result.get();
-  }
-  ExprResult Result = DefaultFunctionArrayLvalueConversion(RHSExp);
-  if (Result.isInvalid())
-    return ExprError();
-  RHSExp = Result.get();
-
-  QualType LHSTy = LHSExp->getType(), RHSTy = RHSExp->getType();
-
-  // C99 6.5.2.1p2: the expression e1[e2] is by definition precisely equivalent
-  // to the expression *((e1)+(e2)). This means the array "Base" may actually be
-  // in the subscript position. As a result, we need to derive the array base
-  // and index from the expression types.
-  Expr *BaseExpr, *IndexExpr;
-  QualType ResultType;
-  if (LHSTy->isDependentType() || RHSTy->isDependentType()) {
-    BaseExpr = LHSExp;
-    IndexExpr = RHSExp;
-    ResultType = Context.DependentTy;
-  } else if (const PointerType *PTy = LHSTy->getAs<PointerType>()) {
-    BaseExpr = LHSExp;
-    IndexExpr = RHSExp;
-    ResultType = PTy->getPointeeType();
-  } else if (const ObjCObjectPointerType *PTy =
-               LHSTy->getAs<ObjCObjectPointerType>()) {
-    BaseExpr = LHSExp;
-    IndexExpr = RHSExp;
-
-    // Use custom logic if this should be the pseudo-object subscript
-    // expression.
-    if (!LangOpts.isSubscriptPointerArithmetic())
-      return BuildObjCSubscriptExpression(RLoc, BaseExpr, IndexExpr, nullptr,
-                                          nullptr);
-
-    ResultType = PTy->getPointeeType();
-  } else if (const PointerType *PTy = RHSTy->getAs<PointerType>()) {
-     // Handle the uncommon case of "123[Ptr]".
-    BaseExpr = RHSExp;
-    IndexExpr = LHSExp;
-    ResultType = PTy->getPointeeType();
-  } else if (const ObjCObjectPointerType *PTy =
-               RHSTy->getAs<ObjCObjectPointerType>()) {
-     // Handle the uncommon case of "123[Ptr]".
-    BaseExpr = RHSExp;
-    IndexExpr = LHSExp;
-    ResultType = PTy->getPointeeType();
-    if (!LangOpts.isSubscriptPointerArithmetic()) {
-      Diag(LLoc, diag::err_subscript_nonfragile_interface)
-        << ResultType << BaseExpr->getSourceRange();
-      return ExprError();
-    }
-  } else if (const VectorType *VTy = LHSTy->getAs<VectorType>()) {
-    BaseExpr = LHSExp;    // vectors: V[123]
-    IndexExpr = RHSExp;
-    // We apply C++ DR1213 to vector subscripting too.
-    if (getLangOpts().CPlusPlus11 && LHSExp->getValueKind() == VK_RValue) {
-      ExprResult Materialized = TemporaryMaterializationConversion(LHSExp);
-      if (Materialized.isInvalid())
-        return ExprError();
-      LHSExp = Materialized.get();
-    }
-    VK = LHSExp->getValueKind();
-    if (VK != VK_RValue)
-      OK = OK_VectorComponent;
-
-    ResultType = VTy->getElementType();
-    QualType BaseType = BaseExpr->getType();
-    Qualifiers BaseQuals = BaseType.getQualifiers();
-    Qualifiers MemberQuals = ResultType.getQualifiers();
-    Qualifiers Combined = BaseQuals + MemberQuals;
-    if (Combined != MemberQuals)
-      ResultType = Context.getQualifiedType(ResultType, Combined);
-  } else if (LHSTy->isArrayType()) {
-    // If we see an array that wasn't promoted by
-    // DefaultFunctionArrayLvalueConversion, it must be an array that
-    // wasn't promoted because of the C90 rule that doesn't
-    // allow promoting non-lvalue arrays.  Warn, then
-    // force the promotion here.
-    Diag(LHSExp->getBeginLoc(), diag::ext_subscript_non_lvalue)
-        << LHSExp->getSourceRange();
-    LHSExp = ImpCastExprToType(LHSExp, Context.getArrayDecayedType(LHSTy),
-                               CK_ArrayToPointerDecay).get();
-    LHSTy = LHSExp->getType();
-
-    BaseExpr = LHSExp;
-    IndexExpr = RHSExp;
-    ResultType = LHSTy->getAs<PointerType>()->getPointeeType();
-  } else if (RHSTy->isArrayType()) {
-    // Same as previous, except for 123[f().a] case
-    Diag(RHSExp->getBeginLoc(), diag::ext_subscript_non_lvalue)
-        << RHSExp->getSourceRange();
-    RHSExp = ImpCastExprToType(RHSExp, Context.getArrayDecayedType(RHSTy),
-                               CK_ArrayToPointerDecay).get();
-    RHSTy = RHSExp->getType();
-
-    BaseExpr = RHSExp;
-    IndexExpr = LHSExp;
-    ResultType = RHSTy->getAs<PointerType>()->getPointeeType();
-  } else {
-    return ExprError(Diag(LLoc, diag::err_typecheck_subscript_value)
-       << LHSExp->getSourceRange() << RHSExp->getSourceRange());
-  }
-  // C99 6.5.2.1p1
-  if (!IndexExpr->getType()->isIntegerType() && !IndexExpr->isTypeDependent())
-    return ExprError(Diag(LLoc, diag::err_typecheck_subscript_not_integer)
-                     << IndexExpr->getSourceRange());
-
-  if ((IndexExpr->getType()->isSpecificBuiltinType(BuiltinType::Char_S) ||
-       IndexExpr->getType()->isSpecificBuiltinType(BuiltinType::Char_U))
-         && !IndexExpr->isTypeDependent())
-    Diag(LLoc, diag::warn_subscript_is_char) << IndexExpr->getSourceRange();
-
-  // C99 6.5.2.1p1: "shall have type "pointer to *object* type". Similarly,
-  // C++ [expr.sub]p1: The type "T" shall be a completely-defined object
-  // type. Note that Functions are not objects, and that (in C99 parlance)
-  // incomplete types are not object types.
-  if (ResultType->isFunctionType()) {
-    Diag(BaseExpr->getBeginLoc(), diag::err_subscript_function_type)
-        << ResultType << BaseExpr->getSourceRange();
-    return ExprError();
-  }
-
-  if (ResultType->isVoidType() && !getLangOpts().CPlusPlus) {
-    // GNU extension: subscripting on pointer to void
-    Diag(LLoc, diag::ext_gnu_subscript_void_type)
-      << BaseExpr->getSourceRange();
-
-    // C forbids expressions of unqualified void type from being l-values.
-    // See IsCForbiddenLValueType.
-    if (!ResultType.hasQualifiers()) VK = VK_RValue;
-  } else if (!ResultType->isDependentType() &&
-      RequireCompleteType(LLoc, ResultType,
-                          diag::err_subscript_incomplete_type, BaseExpr))
-    return ExprError();
-
-  assert(VK == VK_RValue || LangOpts.CPlusPlus ||
-         !ResultType.isCForbiddenLValueType());
-
-  return new (Context)
-      ArraySubscriptExpr(LHSExp, RHSExp, ResultType, VK, OK, RLoc);
-}
-
-bool Sema::CheckCXXDefaultArgExpr(SourceLocation CallLoc, FunctionDecl *FD,
-                                  ParmVarDecl *Param) {
-  if (Param->hasUnparsedDefaultArg()) {
-    Diag(CallLoc,
-         diag::err_use_of_default_argument_to_function_declared_later) <<
-      FD << cast<CXXRecordDecl>(FD->getDeclContext())->getDeclName();
-    Diag(UnparsedDefaultArgLocs[Param],
-         diag::note_default_argument_declared_here);
-    return true;
-  }
-
-  if (Param->hasUninstantiatedDefaultArg()) {
-    Expr *UninstExpr = Param->getUninstantiatedDefaultArg();
-
-    EnterExpressionEvaluationContext EvalContext(
-        *this, ExpressionEvaluationContext::PotentiallyEvaluated, Param);
-
-    // Instantiate the expression.
-    //
-    // FIXME: Pass in a correct Pattern argument, otherwise
-    // getTemplateInstantiationArgs uses the lexical context of FD, e.g.
-    //
-    // template<typename T>
-    // struct A {
-    //   static int FooImpl();
-    //
-    //   template<typename Tp>
-    //   // bug: default argument A<T>::FooImpl() is evaluated with 2-level
-    //   // template argument list [[T], [Tp]], should be [[Tp]].
-    //   friend A<Tp> Foo(int a);
-    // };
-    //
-    // template<typename T>
-    // A<T> Foo(int a = A<T>::FooImpl());
-    MultiLevelTemplateArgumentList MutiLevelArgList
-      = getTemplateInstantiationArgs(FD, nullptr, /*RelativeToPrimary=*/true);
-
-    InstantiatingTemplate Inst(*this, CallLoc, Param,
-                               MutiLevelArgList.getInnermost());
-    if (Inst.isInvalid())
-      return true;
-    if (Inst.isAlreadyInstantiating()) {
-      Diag(Param->getBeginLoc(), diag::err_recursive_default_argument) << FD;
-      Param->setInvalidDecl();
-      return true;
-    }
-
-    ExprResult Result;
-    {
-      // C++ [dcl.fct.default]p5:
-      //   The names in the [default argument] expression are bound, and
-      //   the semantic constraints are checked, at the point where the
-      //   default argument expression appears.
-      ContextRAII SavedContext(*this, FD);
-      LocalInstantiationScope Local(*this);
-      Result = SubstInitializer(UninstExpr, MutiLevelArgList,
-                                /*DirectInit*/false);
-    }
-    if (Result.isInvalid())
-      return true;
-
-    // Check the expression as an initializer for the parameter.
-    InitializedEntity Entity
-      = InitializedEntity::InitializeParameter(Context, Param);
-    InitializationKind Kind = InitializationKind::CreateCopy(
-        Param->getLocation(),
-        /*FIXME:EqualLoc*/ UninstExpr->getBeginLoc());
-    Expr *ResultE = Result.getAs<Expr>();
-
-    InitializationSequence InitSeq(*this, Entity, Kind, ResultE);
-    Result = InitSeq.Perform(*this, Entity, Kind, ResultE);
-    if (Result.isInvalid())
-      return true;
-
-    Result = ActOnFinishFullExpr(Result.getAs<Expr>(),
-                                 Param->getOuterLocStart());
-    if (Result.isInvalid())
-      return true;
-
-    // Remember the instantiated default argument.
-    Param->setDefaultArg(Result.getAs<Expr>());
-    if (ASTMutationListener *L = getASTMutationListener()) {
-      L->DefaultArgumentInstantiated(Param);
-    }
-  }
-
-  // If the default argument expression is not set yet, we are building it now.
-  if (!Param->hasInit()) {
-    Diag(Param->getBeginLoc(), diag::err_recursive_default_argument) << FD;
-    Param->setInvalidDecl();
-    return true;
-  }
-
-  // If the default expression creates temporaries, we need to
-  // push them to the current stack of expression temporaries so they'll
-  // be properly destroyed.
-  // FIXME: We should really be rebuilding the default argument with new
-  // bound temporaries; see the comment in PR5810.
-  // We don't need to do that with block decls, though, because
-  // blocks in default argument expression can never capture anything.
-  if (auto Init = dyn_cast<ExprWithCleanups>(Param->getInit())) {
-    // Set the "needs cleanups" bit regardless of whether there are
-    // any explicit objects.
-    Cleanup.setExprNeedsCleanups(Init->cleanupsHaveSideEffects());
-
-    // Append all the objects to the cleanup list.  Right now, this
-    // should always be a no-op, because blocks in default argument
-    // expressions should never be able to capture anything.
-    assert(!Init->getNumObjects() &&
-           "default argument expression has capturing blocks?");
-  }
-
-  // We already type-checked the argument, so we know it works.
-  // Just mark all of the declarations in this potentially-evaluated expression
-  // as being "referenced".
-  MarkDeclarationsReferencedInExpr(Param->getDefaultArg(),
-                                   /*SkipLocalVariables=*/true);
-  return false;
-}
-
-ExprResult Sema::BuildCXXDefaultArgExpr(SourceLocation CallLoc,
-                                        FunctionDecl *FD, ParmVarDecl *Param) {
-  if (CheckCXXDefaultArgExpr(CallLoc, FD, Param))
-    return ExprError();
-  return CXXDefaultArgExpr::Create(Context, CallLoc, Param);
-}
-
-Sema::VariadicCallType
-Sema::getVariadicCallType(FunctionDecl *FDecl, const FunctionProtoType *Proto,
-                          Expr *Fn) {
-  if (Proto && Proto->isVariadic()) {
-    if (dyn_cast_or_null<CXXConstructorDecl>(FDecl))
-      return VariadicConstructor;
-    else if (Fn && Fn->getType()->isBlockPointerType())
-      return VariadicBlock;
-    else if (FDecl) {
-      if (CXXMethodDecl *Method = dyn_cast_or_null<CXXMethodDecl>(FDecl))
-        if (Method->isInstance())
-          return VariadicMethod;
-    } else if (Fn && Fn->getType() == Context.BoundMemberTy)
-      return VariadicMethod;
-    return VariadicFunction;
-  }
-  return VariadicDoesNotApply;
-}
-
-namespace {
-class FunctionCallCCC : public FunctionCallFilterCCC {
-public:
-  FunctionCallCCC(Sema &SemaRef, const IdentifierInfo *FuncName,
-                  unsigned NumArgs, MemberExpr *ME)
-      : FunctionCallFilterCCC(SemaRef, NumArgs, false, ME),
-        FunctionName(FuncName) {}
-
-  bool ValidateCandidate(const TypoCorrection &candidate) override {
-    if (!candidate.getCorrectionSpecifier() ||
-        candidate.getCorrectionAsIdentifierInfo() != FunctionName) {
-      return false;
-    }
-
-    return FunctionCallFilterCCC::ValidateCandidate(candidate);
-  }
-
-private:
-  const IdentifierInfo *const FunctionName;
-};
-}
-
-static TypoCorrection TryTypoCorrectionForCall(Sema &S, Expr *Fn,
-                                               FunctionDecl *FDecl,
-                                               ArrayRef<Expr *> Args) {
-  MemberExpr *ME = dyn_cast<MemberExpr>(Fn);
-  DeclarationName FuncName = FDecl->getDeclName();
-  SourceLocation NameLoc = ME ? ME->getMemberLoc() : Fn->getBeginLoc();
-
-  if (TypoCorrection Corrected = S.CorrectTypo(
-          DeclarationNameInfo(FuncName, NameLoc), Sema::LookupOrdinaryName,
-          S.getScopeForContext(S.CurContext), nullptr,
-          llvm::make_unique<FunctionCallCCC>(S, FuncName.getAsIdentifierInfo(),
-                                             Args.size(), ME),
-          Sema::CTK_ErrorRecovery)) {
-    if (NamedDecl *ND = Corrected.getFoundDecl()) {
-      if (Corrected.isOverloaded()) {
-        OverloadCandidateSet OCS(NameLoc, OverloadCandidateSet::CSK_Normal);
-        OverloadCandidateSet::iterator Best;
-        for (NamedDecl *CD : Corrected) {
-          if (FunctionDecl *FD = dyn_cast<FunctionDecl>(CD))
-            S.AddOverloadCandidate(FD, DeclAccessPair::make(FD, AS_none), Args,
-                                   OCS);
-        }
-        switch (OCS.BestViableFunction(S, NameLoc, Best)) {
-        case OR_Success:
-          ND = Best->FoundDecl;
-          Corrected.setCorrectionDecl(ND);
-          break;
-        default:
-          break;
-        }
-      }
-      ND = ND->getUnderlyingDecl();
-      if (isa<ValueDecl>(ND) || isa<FunctionTemplateDecl>(ND))
-        return Corrected;
-    }
-  }
-  return TypoCorrection();
-}
-
-/// ConvertArgumentsForCall - Converts the arguments specified in
-/// Args/NumArgs to the parameter types of the function FDecl with
-/// function prototype Proto. Call is the call expression itself, and
-/// Fn is the function expression. For a C++ member function, this
-/// routine does not attempt to convert the object argument. Returns
-/// true if the call is ill-formed.
-bool
-Sema::ConvertArgumentsForCall(CallExpr *Call, Expr *Fn,
-                              FunctionDecl *FDecl,
-                              const FunctionProtoType *Proto,
-                              ArrayRef<Expr *> Args,
-                              SourceLocation RParenLoc,
-                              bool IsExecConfig) {
-  // Bail out early if calling a builtin with custom typechecking.
-  if (FDecl)
-    if (unsigned ID = FDecl->getBuiltinID())
-      if (Context.BuiltinInfo.hasCustomTypechecking(ID))
-        return false;
-
-  // C99 6.5.2.2p7 - the arguments are implicitly converted, as if by
-  // assignment, to the types of the corresponding parameter, ...
-  unsigned NumParams = Proto->getNumParams();
-  bool Invalid = false;
-  unsigned MinArgs = FDecl ? FDecl->getMinRequiredArguments() : NumParams;
-  unsigned FnKind = Fn->getType()->isBlockPointerType()
-                       ? 1 /* block */
-                       : (IsExecConfig ? 3 /* kernel function (exec config) */
-                                       : 0 /* function */);
-
-  // If too few arguments are available (and we don't have default
-  // arguments for the remaining parameters), don't make the call.
-  if (Args.size() < NumParams) {
-    if (Args.size() < MinArgs) {
-      TypoCorrection TC;
-      if (FDecl && (TC = TryTypoCorrectionForCall(*this, Fn, FDecl, Args))) {
-        unsigned diag_id =
-            MinArgs == NumParams && !Proto->isVariadic()
-                ? diag::err_typecheck_call_too_few_args_suggest
-                : diag::err_typecheck_call_too_few_args_at_least_suggest;
-        diagnoseTypo(TC, PDiag(diag_id) << FnKind << MinArgs
-                                        << static_cast<unsigned>(Args.size())
-                                        << TC.getCorrectionRange());
-      } else if (MinArgs == 1 && FDecl && FDecl->getParamDecl(0)->getDeclName())
-        Diag(RParenLoc,
-             MinArgs == NumParams && !Proto->isVariadic()
-                 ? diag::err_typecheck_call_too_few_args_one
-                 : diag::err_typecheck_call_too_few_args_at_least_one)
-            << FnKind << FDecl->getParamDecl(0) << Fn->getSourceRange();
-      else
-        Diag(RParenLoc, MinArgs == NumParams && !Proto->isVariadic()
-                            ? diag::err_typecheck_call_too_few_args
-                            : diag::err_typecheck_call_too_few_args_at_least)
-            << FnKind << MinArgs << static_cast<unsigned>(Args.size())
-            << Fn->getSourceRange();
-
-      // Emit the location of the prototype.
-      if (!TC && FDecl && !FDecl->getBuiltinID() && !IsExecConfig)
-        Diag(FDecl->getBeginLoc(), diag::note_callee_decl) << FDecl;
-
-      return true;
-    }
-    // We reserve space for the default arguments when we create
-    // the call expression, before calling ConvertArgumentsForCall.
-    assert((Call->getNumArgs() == NumParams) &&
-           "We should have reserved space for the default arguments before!");
-  }
-
-  // If too many are passed and not variadic, error on the extras and drop
-  // them.
-  if (Args.size() > NumParams) {
-    if (!Proto->isVariadic()) {
-      TypoCorrection TC;
-      if (FDecl && (TC = TryTypoCorrectionForCall(*this, Fn, FDecl, Args))) {
-        unsigned diag_id =
-            MinArgs == NumParams && !Proto->isVariadic()
-                ? diag::err_typecheck_call_too_many_args_suggest
-                : diag::err_typecheck_call_too_many_args_at_most_suggest;
-        diagnoseTypo(TC, PDiag(diag_id) << FnKind << NumParams
-                                        << static_cast<unsigned>(Args.size())
-                                        << TC.getCorrectionRange());
-      } else if (NumParams == 1 && FDecl &&
-                 FDecl->getParamDecl(0)->getDeclName())
-        Diag(Args[NumParams]->getBeginLoc(),
-             MinArgs == NumParams
-                 ? diag::err_typecheck_call_too_many_args_one
-                 : diag::err_typecheck_call_too_many_args_at_most_one)
-            << FnKind << FDecl->getParamDecl(0)
-            << static_cast<unsigned>(Args.size()) << Fn->getSourceRange()
-            << SourceRange(Args[NumParams]->getBeginLoc(),
-                           Args.back()->getEndLoc());
-      else
-        Diag(Args[NumParams]->getBeginLoc(),
-             MinArgs == NumParams
-                 ? diag::err_typecheck_call_too_many_args
-                 : diag::err_typecheck_call_too_many_args_at_most)
-            << FnKind << NumParams << static_cast<unsigned>(Args.size())
-            << Fn->getSourceRange()
-            << SourceRange(Args[NumParams]->getBeginLoc(),
-                           Args.back()->getEndLoc());
-
-      // Emit the location of the prototype.
-      if (!TC && FDecl && !FDecl->getBuiltinID() && !IsExecConfig)
-        Diag(FDecl->getBeginLoc(), diag::note_callee_decl) << FDecl;
-
-      // This deletes the extra arguments.
-      Call->shrinkNumArgs(NumParams);
-      return true;
-    }
-  }
-  SmallVector<Expr *, 8> AllArgs;
-  VariadicCallType CallType = getVariadicCallType(FDecl, Proto, Fn);
-
-  Invalid = GatherArgumentsForCall(Call->getBeginLoc(), FDecl, Proto, 0, Args,
-                                   AllArgs, CallType);
-  if (Invalid)
-    return true;
-  unsigned TotalNumArgs = AllArgs.size();
-  for (unsigned i = 0; i < TotalNumArgs; ++i)
-    Call->setArg(i, AllArgs[i]);
-
-  return false;
-}
-
-bool Sema::GatherArgumentsForCall(SourceLocation CallLoc, FunctionDecl *FDecl,
-                                  const FunctionProtoType *Proto,
-                                  unsigned FirstParam, ArrayRef<Expr *> Args,
-                                  SmallVectorImpl<Expr *> &AllArgs,
-                                  VariadicCallType CallType, bool AllowExplicit,
-                                  bool IsListInitialization) {
-  unsigned NumParams = Proto->getNumParams();
-  bool Invalid = false;
-  size_t ArgIx = 0;
-  // Continue to check argument types (even if we have too few/many args).
-  for (unsigned i = FirstParam; i < NumParams; i++) {
-    QualType ProtoArgType = Proto->getParamType(i);
-
-    Expr *Arg;
-    ParmVarDecl *Param = FDecl ? FDecl->getParamDecl(i) : nullptr;
-    if (ArgIx < Args.size()) {
-      Arg = Args[ArgIx++];
-
-      if (RequireCompleteType(Arg->getBeginLoc(), ProtoArgType,
-                              diag::err_call_incomplete_argument, Arg))
-        return true;
-
-      // Strip the unbridged-cast placeholder expression off, if applicable.
-      bool CFAudited = false;
-      if (Arg->getType() == Context.ARCUnbridgedCastTy &&
-          FDecl && FDecl->hasAttr<CFAuditedTransferAttr>() &&
-          (!Param || !Param->hasAttr<CFConsumedAttr>()))
-        Arg = stripARCUnbridgedCast(Arg);
-      else if (getLangOpts().ObjCAutoRefCount &&
-               FDecl && FDecl->hasAttr<CFAuditedTransferAttr>() &&
-               (!Param || !Param->hasAttr<CFConsumedAttr>()))
-        CFAudited = true;
-
-      if (Proto->getExtParameterInfo(i).isNoEscape())
-        if (auto *BE = dyn_cast<BlockExpr>(Arg->IgnoreParenNoopCasts(Context)))
-          BE->getBlockDecl()->setDoesNotEscape();
-
-      InitializedEntity Entity =
-          Param ? InitializedEntity::InitializeParameter(Context, Param,
-                                                         ProtoArgType)
-                : InitializedEntity::InitializeParameter(
-                      Context, ProtoArgType, Proto->isParamConsumed(i));
-
-      // Remember that parameter belongs to a CF audited API.
-      if (CFAudited)
-        Entity.setParameterCFAudited();
-
-      ExprResult ArgE = PerformCopyInitialization(
-          Entity, SourceLocation(), Arg, IsListInitialization, AllowExplicit);
-      if (ArgE.isInvalid())
-        return true;
-
-      Arg = ArgE.getAs<Expr>();
-    } else {
-      assert(Param && "can't use default arguments without a known callee");
-
-      ExprResult ArgExpr =
-        BuildCXXDefaultArgExpr(CallLoc, FDecl, Param);
-      if (ArgExpr.isInvalid())
-        return true;
-
-      Arg = ArgExpr.getAs<Expr>();
-    }
-
-    // Check for array bounds violations for each argument to the call. This
-    // check only triggers warnings when the argument isn't a more complex Expr
-    // with its own checking, such as a BinaryOperator.
-    CheckArrayAccess(Arg);
-
-    // Check for violations of C99 static array rules (C99 6.7.5.3p7).
-    CheckStaticArrayArgument(CallLoc, Param, Arg);
-
-    AllArgs.push_back(Arg);
-  }
-
-  // If this is a variadic call, handle args passed through "...".
-  if (CallType != VariadicDoesNotApply) {
-    // Assume that extern "C" functions with variadic arguments that
-    // return __unknown_anytype aren't *really* variadic.
-    if (Proto->getReturnType() == Context.UnknownAnyTy && FDecl &&
-        FDecl->isExternC()) {
-      for (Expr *A : Args.slice(ArgIx)) {
-        QualType paramType; // ignored
-        ExprResult arg = checkUnknownAnyArg(CallLoc, A, paramType);
-        Invalid |= arg.isInvalid();
-        AllArgs.push_back(arg.get());
-      }
-
-    // Otherwise do argument promotion, (C99 6.5.2.2p7).
-    } else {
-      for (Expr *A : Args.slice(ArgIx)) {
-        ExprResult Arg = DefaultVariadicArgumentPromotion(A, CallType, FDecl);
-        Invalid |= Arg.isInvalid();
-        AllArgs.push_back(Arg.get());
-      }
-    }
-
-    // Check for array bounds violations.
-    for (Expr *A : Args.slice(ArgIx))
-      CheckArrayAccess(A);
-  }
-  return Invalid;
-}
-
-static void DiagnoseCalleeStaticArrayParam(Sema &S, ParmVarDecl *PVD) {
-  TypeLoc TL = PVD->getTypeSourceInfo()->getTypeLoc();
-  if (DecayedTypeLoc DTL = TL.getAs<DecayedTypeLoc>())
-    TL = DTL.getOriginalLoc();
-  if (ArrayTypeLoc ATL = TL.getAs<ArrayTypeLoc>())
-    S.Diag(PVD->getLocation(), diag::note_callee_static_array)
-      << ATL.getLocalSourceRange();
-}
-
-/// CheckStaticArrayArgument - If the given argument corresponds to a static
-/// array parameter, check that it is non-null, and that if it is formed by
-/// array-to-pointer decay, the underlying array is sufficiently large.
-///
-/// C99 6.7.5.3p7: If the keyword static also appears within the [ and ] of the
-/// array type derivation, then for each call to the function, the value of the
-/// corresponding actual argument shall provide access to the first element of
-/// an array with at least as many elements as specified by the size expression.
-void
-Sema::CheckStaticArrayArgument(SourceLocation CallLoc,
-                               ParmVarDecl *Param,
-                               const Expr *ArgExpr) {
-  // Static array parameters are not supported in C++.
-  if (!Param || getLangOpts().CPlusPlus)
-    return;
-
-  QualType OrigTy = Param->getOriginalType();
-
-  const ArrayType *AT = Context.getAsArrayType(OrigTy);
-  if (!AT || AT->getSizeModifier() != ArrayType::Static)
-    return;
-
-  if (ArgExpr->isNullPointerConstant(Context,
-                                     Expr::NPC_NeverValueDependent)) {
-    Diag(CallLoc, diag::warn_null_arg) << ArgExpr->getSourceRange();
-    DiagnoseCalleeStaticArrayParam(*this, Param);
-    return;
-  }
-
-  const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(AT);
-  if (!CAT)
-    return;
-
-  const ConstantArrayType *ArgCAT =
-    Context.getAsConstantArrayType(ArgExpr->IgnoreParenImpCasts()->getType());
-  if (!ArgCAT)
-    return;
-
-  if (ArgCAT->getSize().ult(CAT->getSize())) {
-    Diag(CallLoc, diag::warn_static_array_too_small)
-      << ArgExpr->getSourceRange()
-      << (unsigned) ArgCAT->getSize().getZExtValue()
-      << (unsigned) CAT->getSize().getZExtValue();
-    DiagnoseCalleeStaticArrayParam(*this, Param);
-  }
-}
-
-/// Given a function expression of unknown-any type, try to rebuild it
-/// to have a function type.
-static ExprResult rebuildUnknownAnyFunction(Sema &S, Expr *fn);
-
-/// Is the given type a placeholder that we need to lower out
-/// immediately during argument processing?
-static bool isPlaceholderToRemoveAsArg(QualType type) {
-  // Placeholders are never sugared.
-  const BuiltinType *placeholder = dyn_cast<BuiltinType>(type);
-  if (!placeholder) return false;
-
-  switch (placeholder->getKind()) {
-  // Ignore all the non-placeholder types.
-#define IMAGE_TYPE(ImgType, Id, SingletonId, Access, Suffix) \
-  case BuiltinType::Id:
-#include "clang/Basic/OpenCLImageTypes.def"
-#define EXT_OPAQUE_TYPE(ExtType, Id, Ext) \
-  case BuiltinType::Id:
-#include "clang/Basic/OpenCLExtensionTypes.def"
-#define PLACEHOLDER_TYPE(ID, SINGLETON_ID)
-#define BUILTIN_TYPE(ID, SINGLETON_ID) case BuiltinType::ID:
-#include "clang/AST/BuiltinTypes.def"
-    return false;
-
-  // We cannot lower out overload sets; they might validly be resolved
-  // by the call machinery.
-  case BuiltinType::Overload:
-    return false;
-
-  // Unbridged casts in ARC can be handled in some call positions and
-  // should be left in place.
-  case BuiltinType::ARCUnbridgedCast:
-    return false;
-
-  // Pseudo-objects should be converted as soon as possible.
-  case BuiltinType::PseudoObject:
-    return true;
-
-  // The debugger mode could theoretically but currently does not try
-  // to resolve unknown-typed arguments based on known parameter types.
-  case BuiltinType::UnknownAny:
-    return true;
-
-  // These are always invalid as call arguments and should be reported.
-  case BuiltinType::BoundMember:
-  case BuiltinType::BuiltinFn:
-  case BuiltinType::OMPArraySection:
-    return true;
-
-  }
-  llvm_unreachable("bad builtin type kind");
-}
-
-/// Check an argument list for placeholders that we won't try to
-/// handle later.
-static bool checkArgsForPlaceholders(Sema &S, MultiExprArg args) {
-  // Apply this processing to all the arguments at once instead of
-  // dying at the first failure.
-  bool hasInvalid = false;
-  for (size_t i = 0, e = args.size(); i != e; i++) {
-    if (isPlaceholderToRemoveAsArg(args[i]->getType())) {
-      ExprResult result = S.CheckPlaceholderExpr(args[i]);
-      if (result.isInvalid()) hasInvalid = true;
-      else args[i] = result.get();
-    } else if (hasInvalid) {
-      (void)S.CorrectDelayedTyposInExpr(args[i]);
-    }
-  }
-  return hasInvalid;
-}
-
-/// If a builtin function has a pointer argument with no explicit address
-/// space, then it should be able to accept a pointer to any address
-/// space as input.  In order to do this, we need to replace the
-/// standard builtin declaration with one that uses the same address space
-/// as the call.
-///
-/// \returns nullptr If this builtin is not a candidate for a rewrite i.e.
-///                  it does not contain any pointer arguments without
-///                  an address space qualifer.  Otherwise the rewritten
-///                  FunctionDecl is returned.
-/// TODO: Handle pointer return types.
-static FunctionDecl *rewriteBuiltinFunctionDecl(Sema *Sema, ASTContext &Context,
-                                                const FunctionDecl *FDecl,
-                                                MultiExprArg ArgExprs) {
-
-  QualType DeclType = FDecl->getType();
-  const FunctionProtoType *FT = dyn_cast<FunctionProtoType>(DeclType);
-
-  if (!Context.BuiltinInfo.hasPtrArgsOrResult(FDecl->getBuiltinID()) ||
-      !FT || FT->isVariadic() || ArgExprs.size() != FT->getNumParams())
-    return nullptr;
-
-  bool NeedsNewDecl = false;
-  unsigned i = 0;
-  SmallVector<QualType, 8> OverloadParams;
-
-  for (QualType ParamType : FT->param_types()) {
-
-    // Convert array arguments to pointer to simplify type lookup.
-    ExprResult ArgRes =
-        Sema->DefaultFunctionArrayLvalueConversion(ArgExprs[i++]);
-    if (ArgRes.isInvalid())
-      return nullptr;
-    Expr *Arg = ArgRes.get();
-    QualType ArgType = Arg->getType();
-    if (!ParamType->isPointerType() ||
-        ParamType.getQualifiers().hasAddressSpace() ||
-        !ArgType->isPointerType() ||
-        !ArgType->getPointeeType().getQualifiers().hasAddressSpace()) {
-      OverloadParams.push_back(ParamType);
-      continue;
-    }
-
-    QualType PointeeType = ParamType->getPointeeType();
-    if (PointeeType.getQualifiers().hasAddressSpace())
-      continue;
-
-    NeedsNewDecl = true;
-    LangAS AS = ArgType->getPointeeType().getAddressSpace();
-
-    PointeeType = Context.getAddrSpaceQualType(PointeeType, AS);
-    OverloadParams.push_back(Context.getPointerType(PointeeType));
-  }
-
-  if (!NeedsNewDecl)
-    return nullptr;
-
-  FunctionProtoType::ExtProtoInfo EPI;
-  QualType OverloadTy = Context.getFunctionType(FT->getReturnType(),
-                                                OverloadParams, EPI);
-  DeclContext *Parent = Context.getTranslationUnitDecl();
-  FunctionDecl *OverloadDecl = FunctionDecl::Create(Context, Parent,
-                                                    FDecl->getLocation(),
-                                                    FDecl->getLocation(),
-                                                    FDecl->getIdentifier(),
-                                                    OverloadTy,
-                                                    /*TInfo=*/nullptr,
-                                                    SC_Extern, false,
-                                                    /*hasPrototype=*/true);
-  SmallVector<ParmVarDecl*, 16> Params;
-  FT = cast<FunctionProtoType>(OverloadTy);
-  for (unsigned i = 0, e = FT->getNumParams(); i != e; ++i) {
-    QualType ParamType = FT->getParamType(i);
-    ParmVarDecl *Parm =
-        ParmVarDecl::Create(Context, OverloadDecl, SourceLocation(),
-                                SourceLocation(), nullptr, ParamType,
-                                /*TInfo=*/nullptr, SC_None, nullptr);
-    Parm->setScopeInfo(0, i);
-    Params.push_back(Parm);
-  }
-  OverloadDecl->setParams(Params);
-  return OverloadDecl;
-}
-
-static void checkDirectCallValidity(Sema &S, const Expr *Fn,
-                                    FunctionDecl *Callee,
-                                    MultiExprArg ArgExprs) {
-  // `Callee` (when called with ArgExprs) may be ill-formed. enable_if (and
-  // similar attributes) really don't like it when functions are called with an
-  // invalid number of args.
-  if (S.TooManyArguments(Callee->getNumParams(), ArgExprs.size(),
-                         /*PartialOverloading=*/false) &&
-      !Callee->isVariadic())
-    return;
-  if (Callee->getMinRequiredArguments() > ArgExprs.size())
-    return;
-
-  if (const EnableIfAttr *Attr = S.CheckEnableIf(Callee, ArgExprs, true)) {
-    S.Diag(Fn->getBeginLoc(),
-           isa<CXXMethodDecl>(Callee)
-               ? diag::err_ovl_no_viable_member_function_in_call
-               : diag::err_ovl_no_viable_function_in_call)
-        << Callee << Callee->getSourceRange();
-    S.Diag(Callee->getLocation(),
-           diag::note_ovl_candidate_disabled_by_function_cond_attr)
-        << Attr->getCond()->getSourceRange() << Attr->getMessage();
-    return;
-  }
-}
-
-static bool enclosingClassIsRelatedToClassInWhichMembersWereFound(
-    const UnresolvedMemberExpr *const UME, Sema &S) {
-
-  const auto GetFunctionLevelDCIfCXXClass =
-      [](Sema &S) -> const CXXRecordDecl * {
-    const DeclContext *const DC = S.getFunctionLevelDeclContext();
-    if (!DC || !DC->getParent())
-      return nullptr;
-
-    // If the call to some member function was made from within a member
-    // function body 'M' return return 'M's parent.
-    if (const auto *MD = dyn_cast<CXXMethodDecl>(DC))
-      return MD->getParent()->getCanonicalDecl();
-    // else the call was made from within a default member initializer of a
-    // class, so return the class.
-    if (const auto *RD = dyn_cast<CXXRecordDecl>(DC))
-      return RD->getCanonicalDecl();
-    return nullptr;
-  };
-  // If our DeclContext is neither a member function nor a class (in the
-  // case of a lambda in a default member initializer), we can't have an
-  // enclosing 'this'.
-
-  const CXXRecordDecl *const CurParentClass = GetFunctionLevelDCIfCXXClass(S);
-  if (!CurParentClass)
-    return false;
-
-  // The naming class for implicit member functions call is the class in which
-  // name lookup starts.
-  const CXXRecordDecl *const NamingClass =
-      UME->getNamingClass()->getCanonicalDecl();
-  assert(NamingClass && "Must have naming class even for implicit access");
-
-  // If the unresolved member functions were found in a 'naming class' that is
-  // related (either the same or derived from) to the class that contains the
-  // member function that itself contained the implicit member access.
-
-  return CurParentClass == NamingClass ||
-         CurParentClass->isDerivedFrom(NamingClass);
-}
-
-static void
-tryImplicitlyCaptureThisIfImplicitMemberFunctionAccessWithDependentArgs(
-    Sema &S, const UnresolvedMemberExpr *const UME, SourceLocation CallLoc) {
-
-  if (!UME)
-    return;
-
-  LambdaScopeInfo *const CurLSI = S.getCurLambda();
-  // Only try and implicitly capture 'this' within a C++ Lambda if it hasn't
-  // already been captured, or if this is an implicit member function call (if
-  // it isn't, an attempt to capture 'this' should already have been made).
-  if (!CurLSI || CurLSI->ImpCaptureStyle == CurLSI->ImpCap_None ||
-      !UME->isImplicitAccess() || CurLSI->isCXXThisCaptured())
-    return;
-
-  // Check if the naming class in which the unresolved members were found is
-  // related (same as or is a base of) to the enclosing class.
-
-  if (!enclosingClassIsRelatedToClassInWhichMembersWereFound(UME, S))
-    return;
-
-
-  DeclContext *EnclosingFunctionCtx = S.CurContext->getParent()->getParent();
-  // If the enclosing function is not dependent, then this lambda is
-  // capture ready, so if we can capture this, do so.
-  if (!EnclosingFunctionCtx->isDependentContext()) {
-    // If the current lambda and all enclosing lambdas can capture 'this' -
-    // then go ahead and capture 'this' (since our unresolved overload set
-    // contains at least one non-static member function).
-    if (!S.CheckCXXThisCapture(CallLoc, /*Explcit*/ false, /*Diagnose*/ false))
-      S.CheckCXXThisCapture(CallLoc);
-  } else if (S.CurContext->isDependentContext()) {
-    // ... since this is an implicit member reference, that might potentially
-    // involve a 'this' capture, mark 'this' for potential capture in
-    // enclosing lambdas.
-    if (CurLSI->ImpCaptureStyle != CurLSI->ImpCap_None)
-      CurLSI->addPotentialThisCapture(CallLoc);
-  }
-}
-
-/// ActOnCallExpr - Handle a call to Fn with the specified array of arguments.
-/// This provides the location of the left/right parens and a list of comma
-/// locations.
-ExprResult Sema::ActOnCallExpr(Scope *Scope, Expr *Fn, SourceLocation LParenLoc,
-                               MultiExprArg ArgExprs, SourceLocation RParenLoc,
-                               Expr *ExecConfig, bool IsExecConfig) {
-  // Since this might be a postfix expression, get rid of ParenListExprs.
-  ExprResult Result = MaybeConvertParenListExprToParenExpr(Scope, Fn);
-  if (Result.isInvalid()) return ExprError();
-  Fn = Result.get();
-
-  if (checkArgsForPlaceholders(*this, ArgExprs))
-    return ExprError();
-
-  if (getLangOpts().CPlusPlus) {
-    // If this is a pseudo-destructor expression, build the call immediately.
-    if (isa<CXXPseudoDestructorExpr>(Fn)) {
-      if (!ArgExprs.empty()) {
-        // Pseudo-destructor calls should not have any arguments.
-        Diag(Fn->getBeginLoc(), diag::err_pseudo_dtor_call_with_args)
-            << FixItHint::CreateRemoval(
-                   SourceRange(ArgExprs.front()->getBeginLoc(),
-                               ArgExprs.back()->getEndLoc()));
-      }
-
-      return CallExpr::Create(Context, Fn, /*Args=*/{}, Context.VoidTy,
-                              VK_RValue, RParenLoc);
-    }
-    if (Fn->getType() == Context.PseudoObjectTy) {
-      ExprResult result = CheckPlaceholderExpr(Fn);
-      if (result.isInvalid()) return ExprError();
-      Fn = result.get();
-    }
-
-    // Determine whether this is a dependent call inside a C++ template,
-    // in which case we won't do any semantic analysis now.
-    if (Fn->isTypeDependent() || Expr::hasAnyTypeDependentArguments(ArgExprs)) {
-      if (ExecConfig) {
-        return CUDAKernelCallExpr::Create(
-            Context, Fn, cast<CallExpr>(ExecConfig), ArgExprs,
-            Context.DependentTy, VK_RValue, RParenLoc);
-      } else {
-
-        tryImplicitlyCaptureThisIfImplicitMemberFunctionAccessWithDependentArgs(
-            *this, dyn_cast<UnresolvedMemberExpr>(Fn->IgnoreParens()),
-            Fn->getBeginLoc());
-
-        return CallExpr::Create(Context, Fn, ArgExprs, Context.DependentTy,
-                                VK_RValue, RParenLoc);
-      }
-    }
-
-    // Determine whether this is a call to an object (C++ [over.call.object]).
-    if (Fn->getType()->isRecordType())
-      return BuildCallToObjectOfClassType(Scope, Fn, LParenLoc, ArgExprs,
-                                          RParenLoc);
-
-    if (Fn->getType() == Context.UnknownAnyTy) {
-      ExprResult result = rebuildUnknownAnyFunction(*this, Fn);
-      if (result.isInvalid()) return ExprError();
-      Fn = result.get();
-    }
-
-    if (Fn->getType() == Context.BoundMemberTy) {
-      return BuildCallToMemberFunction(Scope, Fn, LParenLoc, ArgExprs,
-                                       RParenLoc);
-    }
-  }
-
-  // Check for overloaded calls.  This can happen even in C due to extensions.
-  if (Fn->getType() == Context.OverloadTy) {
-    OverloadExpr::FindResult find = OverloadExpr::find(Fn);
-
-    // We aren't supposed to apply this logic if there's an '&' involved.
-    if (!find.HasFormOfMemberPointer) {
-      if (Expr::hasAnyTypeDependentArguments(ArgExprs))
-        return CallExpr::Create(Context, Fn, ArgExprs, Context.DependentTy,
-                                VK_RValue, RParenLoc);
-      OverloadExpr *ovl = find.Expression;
-      if (UnresolvedLookupExpr *ULE = dyn_cast<UnresolvedLookupExpr>(ovl))
-        return BuildOverloadedCallExpr(
-            Scope, Fn, ULE, LParenLoc, ArgExprs, RParenLoc, ExecConfig,
-            /*AllowTypoCorrection=*/true, find.IsAddressOfOperand);
-      return BuildCallToMemberFunction(Scope, Fn, LParenLoc, ArgExprs,
-                                       RParenLoc);
-    }
-  }
-
-  // If we're directly calling a function, get the appropriate declaration.
-  if (Fn->getType() == Context.UnknownAnyTy) {
-    ExprResult result = rebuildUnknownAnyFunction(*this, Fn);
-    if (result.isInvalid()) return ExprError();
-    Fn = result.get();
-  }
-
-  Expr *NakedFn = Fn->IgnoreParens();
-
-  bool CallingNDeclIndirectly = false;
-  NamedDecl *NDecl = nullptr;
-  if (UnaryOperator *UnOp = dyn_cast<UnaryOperator>(NakedFn)) {
-    if (UnOp->getOpcode() == UO_AddrOf) {
-      CallingNDeclIndirectly = true;
-      NakedFn = UnOp->getSubExpr()->IgnoreParens();
-    }
-  }
-
-  if (isa<DeclRefExpr>(NakedFn)) {
-    NDecl = cast<DeclRefExpr>(NakedFn)->getDecl();
-
-    FunctionDecl *FDecl = dyn_cast<FunctionDecl>(NDecl);
-    if (FDecl && FDecl->getBuiltinID()) {
-      // Rewrite the function decl for this builtin by replacing parameters
-      // with no explicit address space with the address space of the arguments
-      // in ArgExprs.
-      if ((FDecl =
-               rewriteBuiltinFunctionDecl(this, Context, FDecl, ArgExprs))) {
-        NDecl = FDecl;
-        Fn = DeclRefExpr::Create(
-            Context, FDecl->getQualifierLoc(), SourceLocation(), FDecl, false,
-            SourceLocation(), FDecl->getType(), Fn->getValueKind(), FDecl);
-      }
-    }
-  } else if (isa<MemberExpr>(NakedFn))
-    NDecl = cast<MemberExpr>(NakedFn)->getMemberDecl();
-
-  if (FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(NDecl)) {
-    if (CallingNDeclIndirectly && !checkAddressOfFunctionIsAvailable(
-                                      FD, /*Complain=*/true, Fn->getBeginLoc()))
-      return ExprError();
-
-    if (getLangOpts().OpenCL && checkOpenCLDisabledDecl(*FD, *Fn))
-      return ExprError();
-
-    checkDirectCallValidity(*this, Fn, FD, ArgExprs);
-  }
-
-  return BuildResolvedCallExpr(Fn, NDecl, LParenLoc, ArgExprs, RParenLoc,
-                               ExecConfig, IsExecConfig);
-}
-
-/// ActOnAsTypeExpr - create a new asType (bitcast) from the arguments.
-///
-/// __builtin_astype( value, dst type )
-///
-ExprResult Sema::ActOnAsTypeExpr(Expr *E, ParsedType ParsedDestTy,
-                                 SourceLocation BuiltinLoc,
-                                 SourceLocation RParenLoc) {
-  ExprValueKind VK = VK_RValue;
-  ExprObjectKind OK = OK_Ordinary;
-  QualType DstTy = GetTypeFromParser(ParsedDestTy);
-  QualType SrcTy = E->getType();
-  if (Context.getTypeSize(DstTy) != Context.getTypeSize(SrcTy))
-    return ExprError(Diag(BuiltinLoc,
-                          diag::err_invalid_astype_of_different_size)
-                     << DstTy
-                     << SrcTy
-                     << E->getSourceRange());
-  return new (Context) AsTypeExpr(E, DstTy, VK, OK, BuiltinLoc, RParenLoc);
-}
-
-/// ActOnConvertVectorExpr - create a new convert-vector expression from the
-/// provided arguments.
-///
-/// __builtin_convertvector( value, dst type )
-///
-ExprResult Sema::ActOnConvertVectorExpr(Expr *E, ParsedType ParsedDestTy,
-                                        SourceLocation BuiltinLoc,
-                                        SourceLocation RParenLoc) {
-  TypeSourceInfo *TInfo;
-  GetTypeFromParser(ParsedDestTy, &TInfo);
-  return SemaConvertVectorExpr(E, TInfo, BuiltinLoc, RParenLoc);
-}
-
-/// BuildResolvedCallExpr - Build a call to a resolved expression,
-/// i.e. an expression not of \p OverloadTy.  The expression should
-/// unary-convert to an expression of function-pointer or
-/// block-pointer type.
-///
-/// \param NDecl the declaration being called, if available
-ExprResult Sema::BuildResolvedCallExpr(Expr *Fn, NamedDecl *NDecl,
-                                       SourceLocation LParenLoc,
-                                       ArrayRef<Expr *> Args,
-                                       SourceLocation RParenLoc, Expr *Config,
-                                       bool IsExecConfig, ADLCallKind UsesADL) {
-  FunctionDecl *FDecl = dyn_cast_or_null<FunctionDecl>(NDecl);
-  unsigned BuiltinID = (FDecl ? FDecl->getBuiltinID() : 0);
-
-  // Functions with 'interrupt' attribute cannot be called directly.
-  if (FDecl && FDecl->hasAttr<AnyX86InterruptAttr>()) {
-    Diag(Fn->getExprLoc(), diag::err_anyx86_interrupt_called);
-    return ExprError();
-  }
-
-  // Interrupt handlers don't save off the VFP regs automatically on ARM,
-  // so there's some risk when calling out to non-interrupt handler functions
-  // that the callee might not preserve them. This is easy to diagnose here,
-  // but can be very challenging to debug.
-  if (auto *Caller = getCurFunctionDecl())
-    if (Caller->hasAttr<ARMInterruptAttr>()) {
-      bool VFP = Context.getTargetInfo().hasFeature("vfp");
-      if (VFP && (!FDecl || !FDecl->hasAttr<ARMInterruptAttr>()))
-        Diag(Fn->getExprLoc(), diag::warn_arm_interrupt_calling_convention);
-    }
-
-  // Promote the function operand.
-  // We special-case function promotion here because we only allow promoting
-  // builtin functions to function pointers in the callee of a call.
-  ExprResult Result;
-  QualType ResultTy;
-  if (BuiltinID &&
-      Fn->getType()->isSpecificBuiltinType(BuiltinType::BuiltinFn)) {
-    // Extract the return type from the (builtin) function pointer type.
-    // FIXME Several builtins still have setType in
-    // Sema::CheckBuiltinFunctionCall. One should review their definitions in
-    // Builtins.def to ensure they are correct before removing setType calls.
-    QualType FnPtrTy = Context.getPointerType(FDecl->getType());
-    Result = ImpCastExprToType(Fn, FnPtrTy, CK_BuiltinFnToFnPtr).get();
-    ResultTy = FDecl->getCallResultType();
-  } else {
-    Result = CallExprUnaryConversions(Fn);
-    ResultTy = Context.BoolTy;
-  }
-  if (Result.isInvalid())
-    return ExprError();
-  Fn = Result.get();
-
-  // Check for a valid function type, but only if it is not a builtin which
-  // requires custom type checking. These will be handled by
-  // CheckBuiltinFunctionCall below just after creation of the call expression.
-  const FunctionType *FuncT = nullptr;
-  if (!BuiltinID || !Context.BuiltinInfo.hasCustomTypechecking(BuiltinID)) {
-   retry:
-    if (const PointerType *PT = Fn->getType()->getAs<PointerType>()) {
-      // C99 6.5.2.2p1 - "The expression that denotes the called function shall
-      // have type pointer to function".
-      FuncT = PT->getPointeeType()->getAs<FunctionType>();
-      if (!FuncT)
-        return ExprError(Diag(LParenLoc, diag::err_typecheck_call_not_function)
-                           << Fn->getType() << Fn->getSourceRange());
-    } else if (const BlockPointerType *BPT =
-                 Fn->getType()->getAs<BlockPointerType>()) {
-      FuncT = BPT->getPointeeType()->castAs<FunctionType>();
-    } else {
-      // Handle calls to expressions of unknown-any type.
-      if (Fn->getType() == Context.UnknownAnyTy) {
-        ExprResult rewrite = rebuildUnknownAnyFunction(*this, Fn);
-        if (rewrite.isInvalid()) return ExprError();
-        Fn = rewrite.get();
-        goto retry;
-      }
-
-    return ExprError(Diag(LParenLoc, diag::err_typecheck_call_not_function)
-      << Fn->getType() << Fn->getSourceRange());
-    }
-  }
-
-  // Get the number of parameters in the function prototype, if any.
-  // We will allocate space for max(Args.size(), NumParams) arguments
-  // in the call expression.
-  const auto *Proto = dyn_cast_or_null<FunctionProtoType>(FuncT);
-  unsigned NumParams = Proto ? Proto->getNumParams() : 0;
-
-  CallExpr *TheCall;
-  if (Config) {
-    assert(UsesADL == ADLCallKind::NotADL &&
-           "CUDAKernelCallExpr should not use ADL");
-    TheCall =
-        CUDAKernelCallExpr::Create(Context, Fn, cast<CallExpr>(Config), Args,
-                                   ResultTy, VK_RValue, RParenLoc, NumParams);
-  } else {
-    TheCall = CallExpr::Create(Context, Fn, Args, ResultTy, VK_RValue,
-                               RParenLoc, NumParams, UsesADL);
-  }
-
-  if (!getLangOpts().CPlusPlus) {
-    // Forget about the nulled arguments since typo correction
-    // do not handle them well.
-    TheCall->shrinkNumArgs(Args.size());
-    // C cannot always handle TypoExpr nodes in builtin calls and direct
-    // function calls as their argument checking don't necessarily handle
-    // dependent types properly, so make sure any TypoExprs have been
-    // dealt with.
-    ExprResult Result = CorrectDelayedTyposInExpr(TheCall);
-    if (!Result.isUsable()) return ExprError();
-    CallExpr *TheOldCall = TheCall;
-    TheCall = dyn_cast<CallExpr>(Result.get());
-    bool CorrectedTypos = TheCall != TheOldCall;
-    if (!TheCall) return Result;
-    Args = llvm::makeArrayRef(TheCall->getArgs(), TheCall->getNumArgs());
-
-    // A new call expression node was created if some typos were corrected.
-    // However it may not have been constructed with enough storage. In this
-    // case, rebuild the node with enough storage. The waste of space is
-    // immaterial since this only happens when some typos were corrected.
-    if (CorrectedTypos && Args.size() < NumParams) {
-      if (Config)
-        TheCall = CUDAKernelCallExpr::Create(
-            Context, Fn, cast<CallExpr>(Config), Args, ResultTy, VK_RValue,
-            RParenLoc, NumParams);
-      else
-        TheCall = CallExpr::Create(Context, Fn, Args, ResultTy, VK_RValue,
-                                   RParenLoc, NumParams, UsesADL);
-    }
-    // We can now handle the nulled arguments for the default arguments.
-    TheCall->setNumArgsUnsafe(std::max<unsigned>(Args.size(), NumParams));
-  }
-
-  // Bail out early if calling a builtin with custom type checking.
-  if (BuiltinID && Context.BuiltinInfo.hasCustomTypechecking(BuiltinID))
-    return CheckBuiltinFunctionCall(FDecl, BuiltinID, TheCall);
-
-  if (getLangOpts().CUDA) {
-    if (Config) {
-      // CUDA: Kernel calls must be to global functions
-      if (FDecl && !FDecl->hasAttr<CUDAGlobalAttr>())
-        return ExprError(Diag(LParenLoc,diag::err_kern_call_not_global_function)
-            << FDecl << Fn->getSourceRange());
-
-      // CUDA: Kernel function must have 'void' return type
-      if (!FuncT->getReturnType()->isVoidType())
-        return ExprError(Diag(LParenLoc, diag::err_kern_type_not_void_return)
-            << Fn->getType() << Fn->getSourceRange());
-    } else {
-      // CUDA: Calls to global functions must be configured
-      if (FDecl && FDecl->hasAttr<CUDAGlobalAttr>())
-        return ExprError(Diag(LParenLoc, diag::err_global_call_not_config)
-            << FDecl << Fn->getSourceRange());
-    }
-  }
-
-  // Check for a valid return type
-  if (CheckCallReturnType(FuncT->getReturnType(), Fn->getBeginLoc(), TheCall,
-                          FDecl))
-    return ExprError();
-
-  // We know the result type of the call, set it.
-  TheCall->setType(FuncT->getCallResultType(Context));
-  TheCall->setValueKind(Expr::getValueKindForType(FuncT->getReturnType()));
-
-  if (Proto) {
-    if (ConvertArgumentsForCall(TheCall, Fn, FDecl, Proto, Args, RParenLoc,
-                                IsExecConfig))
-      return ExprError();
-  } else {
-    assert(isa<FunctionNoProtoType>(FuncT) && "Unknown FunctionType!");
-
-    if (FDecl) {
-      // Check if we have too few/too many template arguments, based
-      // on our knowledge of the function definition.
-      const FunctionDecl *Def = nullptr;
-      if (FDecl->hasBody(Def) && Args.size() != Def->param_size()) {
-        Proto = Def->getType()->getAs<FunctionProtoType>();
-       if (!Proto || !(Proto->isVariadic() && Args.size() >= Def->param_size()))
-          Diag(RParenLoc, diag::warn_call_wrong_number_of_arguments)
-          << (Args.size() > Def->param_size()) << FDecl << Fn->getSourceRange();
-      }
-
-      // If the function we're calling isn't a function prototype, but we have
-      // a function prototype from a prior declaratiom, use that prototype.
-      if (!FDecl->hasPrototype())
-        Proto = FDecl->getType()->getAs<FunctionProtoType>();
-    }
-
-    // Promote the arguments (C99 6.5.2.2p6).
-    for (unsigned i = 0, e = Args.size(); i != e; i++) {
-      Expr *Arg = Args[i];
-
-      if (Proto && i < Proto->getNumParams()) {
-        InitializedEntity Entity = InitializedEntity::InitializeParameter(
-            Context, Proto->getParamType(i), Proto->isParamConsumed(i));
-        ExprResult ArgE =
-            PerformCopyInitialization(Entity, SourceLocation(), Arg);
-        if (ArgE.isInvalid())
-          return true;
-
-        Arg = ArgE.getAs<Expr>();
-
-      } else {
-        ExprResult ArgE = DefaultArgumentPromotion(Arg);
-
-        if (ArgE.isInvalid())
-          return true;
-
-        Arg = ArgE.getAs<Expr>();
-      }
-
-      if (RequireCompleteType(Arg->getBeginLoc(), Arg->getType(),
-                              diag::err_call_incomplete_argument, Arg))
-        return ExprError();
-
-      TheCall->setArg(i, Arg);
-    }
-  }
-
-  if (CXXMethodDecl *Method = dyn_cast_or_null<CXXMethodDecl>(FDecl))
-    if (!Method->isStatic())
-      return ExprError(Diag(LParenLoc, diag::err_member_call_without_object)
-        << Fn->getSourceRange());
-
-  // Check for sentinels
-  if (NDecl)
-    DiagnoseSentinelCalls(NDecl, LParenLoc, Args);
-
-  // Do special checking on direct calls to functions.
-  if (FDecl) {
-    if (CheckFunctionCall(FDecl, TheCall, Proto))
-      return ExprError();
-
-    if (BuiltinID)
-      return CheckBuiltinFunctionCall(FDecl, BuiltinID, TheCall);
-  } else if (NDecl) {
-    if (CheckPointerCall(NDecl, TheCall, Proto))
-      return ExprError();
-  } else {
-    if (CheckOtherCall(TheCall, Proto))
-      return ExprError();
-  }
-
-  return MaybeBindToTemporary(TheCall);
-}
-
-ExprResult
-Sema::ActOnCompoundLiteral(SourceLocation LParenLoc, ParsedType Ty,
-                           SourceLocation RParenLoc, Expr *InitExpr) {
-  assert(Ty && "ActOnCompoundLiteral(): missing type");
-  assert(InitExpr && "ActOnCompoundLiteral(): missing expression");
-
-  TypeSourceInfo *TInfo;
-  QualType literalType = GetTypeFromParser(Ty, &TInfo);
-  if (!TInfo)
-    TInfo = Context.getTrivialTypeSourceInfo(literalType);
-
-  return BuildCompoundLiteralExpr(LParenLoc, TInfo, RParenLoc, InitExpr);
-}
-
-ExprResult
-Sema::BuildCompoundLiteralExpr(SourceLocation LParenLoc, TypeSourceInfo *TInfo,
-                               SourceLocation RParenLoc, Expr *LiteralExpr) {
-  QualType literalType = TInfo->getType();
-
-  if (literalType->isArrayType()) {
-    if (RequireCompleteType(LParenLoc, Context.getBaseElementType(literalType),
-          diag::err_illegal_decl_array_incomplete_type,
-          SourceRange(LParenLoc,
-                      LiteralExpr->getSourceRange().getEnd())))
-      return ExprError();
-    if (literalType->isVariableArrayType())
-      return ExprError(Diag(LParenLoc, diag::err_variable_object_no_init)
-        << SourceRange(LParenLoc, LiteralExpr->getSourceRange().getEnd()));
-  } else if (!literalType->isDependentType() &&
-             RequireCompleteType(LParenLoc, literalType,
-               diag::err_typecheck_decl_incomplete_type,
-               SourceRange(LParenLoc, LiteralExpr->getSourceRange().getEnd())))
-    return ExprError();
-
-  InitializedEntity Entity
-    = InitializedEntity::InitializeCompoundLiteralInit(TInfo);
-  InitializationKind Kind
-    = InitializationKind::CreateCStyleCast(LParenLoc,
-                                           SourceRange(LParenLoc, RParenLoc),
-                                           /*InitList=*/true);
-  InitializationSequence InitSeq(*this, Entity, Kind, LiteralExpr);
-  ExprResult Result = InitSeq.Perform(*this, Entity, Kind, LiteralExpr,
-                                      &literalType);
-  if (Result.isInvalid())
-    return ExprError();
-  LiteralExpr = Result.get();
-
-  bool isFileScope = !CurContext->isFunctionOrMethod();
-
-  // In C, compound literals are l-values for some reason.
-  // For GCC compatibility, in C++, file-scope array compound literals with
-  // constant initializers are also l-values, and compound literals are
-  // otherwise prvalues.
-  //
-  // (GCC also treats C++ list-initialized file-scope array prvalues with
-  // constant initializers as l-values, but that's non-conforming, so we don't
-  // follow it there.)
-  //
-  // FIXME: It would be better to handle the lvalue cases as materializing and
-  // lifetime-extending a temporary object, but our materialized temporaries
-  // representation only supports lifetime extension from a variable, not "out
-  // of thin air".
-  // FIXME: For C++, we might want to instead lifetime-extend only if a pointer
-  // is bound to the result of applying array-to-pointer decay to the compound
-  // literal.
-  // FIXME: GCC supports compound literals of reference type, which should
-  // obviously have a value kind derived from the kind of reference involved.
-  ExprValueKind VK =
-      (getLangOpts().CPlusPlus && !(isFileScope && literalType->isArrayType()))
-          ? VK_RValue
-          : VK_LValue;
-
-  if (isFileScope)
-    if (auto ILE = dyn_cast<InitListExpr>(LiteralExpr))
-      for (unsigned i = 0, j = ILE->getNumInits(); i != j; i++) {
-        Expr *Init = ILE->getInit(i);
-        ILE->setInit(i, ConstantExpr::Create(Context, Init));
-      }
-
-  Expr *E = new (Context) CompoundLiteralExpr(LParenLoc, TInfo, literalType,
-                                              VK, LiteralExpr, isFileScope);
-  if (isFileScope) {
-    if (!LiteralExpr->isTypeDependent() &&
-        !LiteralExpr->isValueDependent() &&
-        !literalType->isDependentType()) // C99 6.5.2.5p3
-      if (CheckForConstantInitializer(LiteralExpr, literalType))
-        return ExprError();
-  } else if (literalType.getAddressSpace() != LangAS::opencl_private &&
-             literalType.getAddressSpace() != LangAS::Default) {
-    // Embedded-C extensions to C99 6.5.2.5:
-    //   "If the compound literal occurs inside the body of a function, the
-    //   type name shall not be qualified by an address-space qualifier."
-    Diag(LParenLoc, diag::err_compound_literal_with_address_space)
-      << SourceRange(LParenLoc, LiteralExpr->getSourceRange().getEnd());
-    return ExprError();
-  }
-
-  return MaybeBindToTemporary(E);
-}
-
-ExprResult
-Sema::ActOnInitList(SourceLocation LBraceLoc, MultiExprArg InitArgList,
-                    SourceLocation RBraceLoc) {
-  // Immediately handle non-overload placeholders.  Overloads can be
-  // resolved contextually, but everything else here can't.
-  for (unsigned I = 0, E = InitArgList.size(); I != E; ++I) {
-    if (InitArgList[I]->getType()->isNonOverloadPlaceholderType()) {
-      ExprResult result = CheckPlaceholderExpr(InitArgList[I]);
-
-      // Ignore failures; dropping the entire initializer list because
-      // of one failure would be terrible for indexing/etc.
-      if (result.isInvalid()) continue;
-
-      InitArgList[I] = result.get();
-    }
-  }
-
-  // Semantic analysis for initializers is done by ActOnDeclarator() and
-  // CheckInitializer() - it requires knowledge of the object being initialized.
-
-  InitListExpr *E = new (Context) InitListExpr(Context, LBraceLoc, InitArgList,
-                                               RBraceLoc);
-  E->setType(Context.VoidTy); // FIXME: just a place holder for now.
-  return E;
-}
-
-/// Do an explicit extend of the given block pointer if we're in ARC.
-void Sema::maybeExtendBlockObject(ExprResult &E) {
-  assert(E.get()->getType()->isBlockPointerType());
-  assert(E.get()->isRValue());
-
-  // Only do this in an r-value context.
-  if (!getLangOpts().ObjCAutoRefCount) return;
-
-  E = ImplicitCastExpr::Create(Context, E.get()->getType(),
-                               CK_ARCExtendBlockObject, E.get(),
-                               /*base path*/ nullptr, VK_RValue);
-  Cleanup.setExprNeedsCleanups(true);
-}
-
-/// Prepare a conversion of the given expression to an ObjC object
-/// pointer type.
-CastKind Sema::PrepareCastToObjCObjectPointer(ExprResult &E) {
-  QualType type = E.get()->getType();
-  if (type->isObjCObjectPointerType()) {
-    return CK_BitCast;
-  } else if (type->isBlockPointerType()) {
-    maybeExtendBlockObject(E);
-    return CK_BlockPointerToObjCPointerCast;
-  } else {
-    assert(type->isPointerType());
-    return CK_CPointerToObjCPointerCast;
-  }
-}
-
-/// Prepares for a scalar cast, performing all the necessary stages
-/// except the final cast and returning the kind required.
-CastKind Sema::PrepareScalarCast(ExprResult &Src, QualType DestTy) {
-  // Both Src and Dest are scalar types, i.e. arithmetic or pointer.
-  // Also, callers should have filtered out the invalid cases with
-  // pointers.  Everything else should be possible.
-
-  QualType SrcTy = Src.get()->getType();
-  if (Context.hasSameUnqualifiedType(SrcTy, DestTy))
-    return CK_NoOp;
-
-  switch (Type::ScalarTypeKind SrcKind = SrcTy->getScalarTypeKind()) {
-  case Type::STK_MemberPointer:
-    llvm_unreachable("member pointer type in C");
-
-  case Type::STK_CPointer:
-  case Type::STK_BlockPointer:
-  case Type::STK_ObjCObjectPointer:
-    switch (DestTy->getScalarTypeKind()) {
-    case Type::STK_CPointer: {
-      LangAS SrcAS = SrcTy->getPointeeType().getAddressSpace();
-      LangAS DestAS = DestTy->getPointeeType().getAddressSpace();
-      if (SrcAS != DestAS)
-        return CK_AddressSpaceConversion;
-      if (Context.hasCvrSimilarType(SrcTy, DestTy))
-        return CK_NoOp;
-      return CK_BitCast;
-    }
-    case Type::STK_BlockPointer:
-      return (SrcKind == Type::STK_BlockPointer
-                ? CK_BitCast : CK_AnyPointerToBlockPointerCast);
-    case Type::STK_ObjCObjectPointer:
-      if (SrcKind == Type::STK_ObjCObjectPointer)
-        return CK_BitCast;
-      if (SrcKind == Type::STK_CPointer)
-        return CK_CPointerToObjCPointerCast;
-      maybeExtendBlockObject(Src);
-      return CK_BlockPointerToObjCPointerCast;
-    case Type::STK_Bool:
-      return CK_PointerToBoolean;
-    case Type::STK_Integral:
-      return CK_PointerToIntegral;
-    case Type::STK_Floating:
-    case Type::STK_FloatingComplex:
-    case Type::STK_IntegralComplex:
-    case Type::STK_MemberPointer:
-    case Type::STK_FixedPoint:
-      llvm_unreachable("illegal cast from pointer");
-    }
-    llvm_unreachable("Should have returned before this");
-
-  case Type::STK_FixedPoint:
-    switch (DestTy->getScalarTypeKind()) {
-    case Type::STK_FixedPoint:
-      return CK_FixedPointCast;
-    case Type::STK_Bool:
-      return CK_FixedPointToBoolean;
-    case Type::STK_Integral:
-    case Type::STK_Floating:
-    case Type::STK_IntegralComplex:
-    case Type::STK_FloatingComplex:
-      Diag(Src.get()->getExprLoc(),
-           diag::err_unimplemented_conversion_with_fixed_point_type)
-          << DestTy;
-      return CK_IntegralCast;
-    case Type::STK_CPointer:
-    case Type::STK_ObjCObjectPointer:
-    case Type::STK_BlockPointer:
-    case Type::STK_MemberPointer:
-      llvm_unreachable("illegal cast to pointer type");
-    }
-    llvm_unreachable("Should have returned before this");
-
-  case Type::STK_Bool: // casting from bool is like casting from an integer
-  case Type::STK_Integral:
-    switch (DestTy->getScalarTypeKind()) {
-    case Type::STK_CPointer:
-    case Type::STK_ObjCObjectPointer:
-    case Type::STK_BlockPointer:
-      if (Src.get()->isNullPointerConstant(Context,
-                                           Expr::NPC_ValueDependentIsNull))
-        return CK_NullToPointer;
-      return CK_IntegralToPointer;
-    case Type::STK_Bool:
-      return CK_IntegralToBoolean;
-    case Type::STK_Integral:
-      return CK_IntegralCast;
-    case Type::STK_Floating:
-      return CK_IntegralToFloating;
-    case Type::STK_IntegralComplex:
-      Src = ImpCastExprToType(Src.get(),
-                      DestTy->castAs<ComplexType>()->getElementType(),
-                      CK_IntegralCast);
-      return CK_IntegralRealToComplex;
-    case Type::STK_FloatingComplex:
-      Src = ImpCastExprToType(Src.get(),
-                      DestTy->castAs<ComplexType>()->getElementType(),
-                      CK_IntegralToFloating);
-      return CK_FloatingRealToComplex;
-    case Type::STK_MemberPointer:
-      llvm_unreachable("member pointer type in C");
-    case Type::STK_FixedPoint:
-      Diag(Src.get()->getExprLoc(),
-           diag::err_unimplemented_conversion_with_fixed_point_type)
-          << SrcTy;
-      return CK_IntegralCast;
-    }
-    llvm_unreachable("Should have returned before this");
-
-  case Type::STK_Floating:
-    switch (DestTy->getScalarTypeKind()) {
-    case Type::STK_Floating:
-      return CK_FloatingCast;
-    case Type::STK_Bool:
-      return CK_FloatingToBoolean;
-    case Type::STK_Integral:
-      return CK_FloatingToIntegral;
-    case Type::STK_FloatingComplex:
-      Src = ImpCastExprToType(Src.get(),
-                              DestTy->castAs<ComplexType>()->getElementType(),
-                              CK_FloatingCast);
-      return CK_FloatingRealToComplex;
-    case Type::STK_IntegralComplex:
-      Src = ImpCastExprToType(Src.get(),
-                              DestTy->castAs<ComplexType>()->getElementType(),
-                              CK_FloatingToIntegral);
-      return CK_IntegralRealToComplex;
-    case Type::STK_CPointer:
-    case Type::STK_ObjCObjectPointer:
-    case Type::STK_BlockPointer:
-      llvm_unreachable("valid float->pointer cast?");
-    case Type::STK_MemberPointer:
-      llvm_unreachable("member pointer type in C");
-    case Type::STK_FixedPoint:
-      Diag(Src.get()->getExprLoc(),
-           diag::err_unimplemented_conversion_with_fixed_point_type)
-          << SrcTy;
-      return CK_IntegralCast;
-    }
-    llvm_unreachable("Should have returned before this");
-
-  case Type::STK_FloatingComplex:
-    switch (DestTy->getScalarTypeKind()) {
-    case Type::STK_FloatingComplex:
-      return CK_FloatingComplexCast;
-    case Type::STK_IntegralComplex:
-      return CK_FloatingComplexToIntegralComplex;
-    case Type::STK_Floating: {
-      QualType ET = SrcTy->castAs<ComplexType>()->getElementType();
-      if (Context.hasSameType(ET, DestTy))
-        return CK_FloatingComplexToReal;
-      Src = ImpCastExprToType(Src.get(), ET, CK_FloatingComplexToReal);
-      return CK_FloatingCast;
-    }
-    case Type::STK_Bool:
-      return CK_FloatingComplexToBoolean;
-    case Type::STK_Integral:
-      Src = ImpCastExprToType(Src.get(),
-                              SrcTy->castAs<ComplexType>()->getElementType(),
-                              CK_FloatingComplexToReal);
-      return CK_FloatingToIntegral;
-    case Type::STK_CPointer:
-    case Type::STK_ObjCObjectPointer:
-    case Type::STK_BlockPointer:
-      llvm_unreachable("valid complex float->pointer cast?");
-    case Type::STK_MemberPointer:
-      llvm_unreachable("member pointer type in C");
-    case Type::STK_FixedPoint:
-      Diag(Src.get()->getExprLoc(),
-           diag::err_unimplemented_conversion_with_fixed_point_type)
-          << SrcTy;
-      return CK_IntegralCast;
-    }
-    llvm_unreachable("Should have returned before this");
-
-  case Type::STK_IntegralComplex:
-    switch (DestTy->getScalarTypeKind()) {
-    case Type::STK_FloatingComplex:
-      return CK_IntegralComplexToFloatingComplex;
-    case Type::STK_IntegralComplex:
-      return CK_IntegralComplexCast;
-    case Type::STK_Integral: {
-      QualType ET = SrcTy->castAs<ComplexType>()->getElementType();
-      if (Context.hasSameType(ET, DestTy))
-        return CK_IntegralComplexToReal;
-      Src = ImpCastExprToType(Src.get(), ET, CK_IntegralComplexToReal);
-      return CK_IntegralCast;
-    }
-    case Type::STK_Bool:
-      return CK_IntegralComplexToBoolean;
-    case Type::STK_Floating:
-      Src = ImpCastExprToType(Src.get(),
-                              SrcTy->castAs<ComplexType>()->getElementType(),
-                              CK_IntegralComplexToReal);
-      return CK_IntegralToFloating;
-    case Type::STK_CPointer:
-    case Type::STK_ObjCObjectPointer:
-    case Type::STK_BlockPointer:
-      llvm_unreachable("valid complex int->pointer cast?");
-    case Type::STK_MemberPointer:
-      llvm_unreachable("member pointer type in C");
-    case Type::STK_FixedPoint:
-      Diag(Src.get()->getExprLoc(),
-           diag::err_unimplemented_conversion_with_fixed_point_type)
-          << SrcTy;
-      return CK_IntegralCast;
-    }
-    llvm_unreachable("Should have returned before this");
-  }
-
-  llvm_unreachable("Unhandled scalar cast");
-}
-
-static bool breakDownVectorType(QualType type, uint64_t &len,
-                                QualType &eltType) {
-  // Vectors are simple.
-  if (const VectorType *vecType = type->getAs<VectorType>()) {
-    len = vecType->getNumElements();
-    eltType = vecType->getElementType();
-    assert(eltType->isScalarType());
-    return true;
-  }
-
-  // We allow lax conversion to and from non-vector types, but only if
-  // they're real types (i.e. non-complex, non-pointer scalar types).
-  if (!type->isRealType()) return false;
-
-  len = 1;
-  eltType = type;
-  return true;
-}
-
-/// Are the two types lax-compatible vector types?  That is, given
-/// that one of them is a vector, do they have equal storage sizes,
-/// where the storage size is the number of elements times the element
-/// size?
-///
-/// This will also return false if either of the types is neither a
-/// vector nor a real type.
-bool Sema::areLaxCompatibleVectorTypes(QualType srcTy, QualType destTy) {
-  assert(destTy->isVectorType() || srcTy->isVectorType());
-
-  // Disallow lax conversions between scalars and ExtVectors (these
-  // conversions are allowed for other vector types because common headers
-  // depend on them).  Most scalar OP ExtVector cases are handled by the
-  // splat path anyway, which does what we want (convert, not bitcast).
-  // What this rules out for ExtVectors is crazy things like char4*float.
-  if (srcTy->isScalarType() && destTy->isExtVectorType()) return false;
-  if (destTy->isScalarType() && srcTy->isExtVectorType()) return false;
-
-  uint64_t srcLen, destLen;
-  QualType srcEltTy, destEltTy;
-  if (!breakDownVectorType(srcTy, srcLen, srcEltTy)) return false;
-  if (!breakDownVectorType(destTy, destLen, destEltTy)) return false;
-
-  // ASTContext::getTypeSize will return the size rounded up to a
-  // power of 2, so instead of using that, we need to use the raw
-  // element size multiplied by the element count.
-  uint64_t srcEltSize = Context.getTypeSize(srcEltTy);
-  uint64_t destEltSize = Context.getTypeSize(destEltTy);
-
-  return (srcLen * srcEltSize == destLen * destEltSize);
-}
-
-/// Is this a legal conversion between two types, one of which is
-/// known to be a vector type?
-bool Sema::isLaxVectorConversion(QualType srcTy, QualType destTy) {
-  assert(destTy->isVectorType() || srcTy->isVectorType());
-
-  if (!Context.getLangOpts().LaxVectorConversions)
-    return false;
-  return areLaxCompatibleVectorTypes(srcTy, destTy);
-}
-
-bool Sema::CheckVectorCast(SourceRange R, QualType VectorTy, QualType Ty,
-                           CastKind &Kind) {
-  assert(VectorTy->isVectorType() && "Not a vector type!");
-
-  if (Ty->isVectorType() || Ty->isIntegralType(Context)) {
-    if (!areLaxCompatibleVectorTypes(Ty, VectorTy))
-      return Diag(R.getBegin(),
-                  Ty->isVectorType() ?
-                  diag::err_invalid_conversion_between_vectors :
-                  diag::err_invalid_conversion_between_vector_and_integer)
-        << VectorTy << Ty << R;
-  } else
-    return Diag(R.getBegin(),
-                diag::err_invalid_conversion_between_vector_and_scalar)
-      << VectorTy << Ty << R;
-
-  Kind = CK_BitCast;
-  return false;
-}
-
-ExprResult Sema::prepareVectorSplat(QualType VectorTy, Expr *SplattedExpr) {
-  QualType DestElemTy = VectorTy->castAs<VectorType>()->getElementType();
-
-  if (DestElemTy == SplattedExpr->getType())
-    return SplattedExpr;
-
-  assert(DestElemTy->isFloatingType() ||
-         DestElemTy->isIntegralOrEnumerationType());
-
-  CastKind CK;
-  if (VectorTy->isExtVectorType() && SplattedExpr->getType()->isBooleanType()) {
-    // OpenCL requires that we convert `true` boolean expressions to -1, but
-    // only when splatting vectors.
-    if (DestElemTy->isFloatingType()) {
-      // To avoid having to have a CK_BooleanToSignedFloating cast kind, we cast
-      // in two steps: boolean to signed integral, then to floating.
-      ExprResult CastExprRes = ImpCastExprToType(SplattedExpr, Context.IntTy,
-                                                 CK_BooleanToSignedIntegral);
-      SplattedExpr = CastExprRes.get();
-      CK = CK_IntegralToFloating;
-    } else {
-      CK = CK_BooleanToSignedIntegral;
-    }
-  } else {
-    ExprResult CastExprRes = SplattedExpr;
-    CK = PrepareScalarCast(CastExprRes, DestElemTy);
-    if (CastExprRes.isInvalid())
-      return ExprError();
-    SplattedExpr = CastExprRes.get();
-  }
-  return ImpCastExprToType(SplattedExpr, DestElemTy, CK);
-}
-
-ExprResult Sema::CheckExtVectorCast(SourceRange R, QualType DestTy,
-                                    Expr *CastExpr, CastKind &Kind) {
-  assert(DestTy->isExtVectorType() && "Not an extended vector type!");
-
-  QualType SrcTy = CastExpr->getType();
-
-  // If SrcTy is a VectorType, the total size must match to explicitly cast to
-  // an ExtVectorType.
-  // In OpenCL, casts between vectors of different types are not allowed.
-  // (See OpenCL 6.2).
-  if (SrcTy->isVectorType()) {
-    if (!areLaxCompatibleVectorTypes(SrcTy, DestTy) ||
-        (getLangOpts().OpenCL &&
-         !Context.hasSameUnqualifiedType(DestTy, SrcTy))) {
-      Diag(R.getBegin(),diag::err_invalid_conversion_between_ext_vectors)
-        << DestTy << SrcTy << R;
-      return ExprError();
-    }
-    Kind = CK_BitCast;
-    return CastExpr;
-  }
-
-  // All non-pointer scalars can be cast to ExtVector type.  The appropriate
-  // conversion will take place first from scalar to elt type, and then
-  // splat from elt type to vector.
-  if (SrcTy->isPointerType())
-    return Diag(R.getBegin(),
-                diag::err_invalid_conversion_between_vector_and_scalar)
-      << DestTy << SrcTy << R;
-
-  Kind = CK_VectorSplat;
-  return prepareVectorSplat(DestTy, CastExpr);
-}
-
-ExprResult
-Sema::ActOnCastExpr(Scope *S, SourceLocation LParenLoc,
-                    Declarator &D, ParsedType &Ty,
-                    SourceLocation RParenLoc, Expr *CastExpr) {
-  assert(!D.isInvalidType() && (CastExpr != nullptr) &&
-         "ActOnCastExpr(): missing type or expr");
-
-  TypeSourceInfo *castTInfo = GetTypeForDeclaratorCast(D, CastExpr->getType());
-  if (D.isInvalidType())
-    return ExprError();
-
-  if (getLangOpts().CPlusPlus) {
-    // Check that there are no default arguments (C++ only).
-    CheckExtraCXXDefaultArguments(D);
-  } else {
-    // Make sure any TypoExprs have been dealt with.
-    ExprResult Res = CorrectDelayedTyposInExpr(CastExpr);
-    if (!Res.isUsable())
-      return ExprError();
-    CastExpr = Res.get();
-  }
-
-  checkUnusedDeclAttributes(D);
-
-  QualType castType = castTInfo->getType();
-  Ty = CreateParsedType(castType, castTInfo);
-
-  bool isVectorLiteral = false;
-
-  // Check for an altivec or OpenCL literal,
-  // i.e. all the elements are integer constants.
-  ParenExpr *PE = dyn_cast<ParenExpr>(CastExpr);
-  ParenListExpr *PLE = dyn_cast<ParenListExpr>(CastExpr);
-  if ((getLangOpts().AltiVec || getLangOpts().ZVector || getLangOpts().OpenCL)
-       && castType->isVectorType() && (PE || PLE)) {
-    if (PLE && PLE->getNumExprs() == 0) {
-      Diag(PLE->getExprLoc(), diag::err_altivec_empty_initializer);
-      return ExprError();
-    }
-    if (PE || PLE->getNumExprs() == 1) {
-      Expr *E = (PE ? PE->getSubExpr() : PLE->getExpr(0));
-      if (!E->getType()->isVectorType())
-        isVectorLiteral = true;
-    }
-    else
-      isVectorLiteral = true;
-  }
-
-  // If this is a vector initializer, '(' type ')' '(' init, ..., init ')'
-  // then handle it as such.
-  if (isVectorLiteral)
-    return BuildVectorLiteral(LParenLoc, RParenLoc, CastExpr, castTInfo);
-
-  // If the Expr being casted is a ParenListExpr, handle it specially.
-  // This is not an AltiVec-style cast, so turn the ParenListExpr into a
-  // sequence of BinOp comma operators.
-  if (isa<ParenListExpr>(CastExpr)) {
-    ExprResult Result = MaybeConvertParenListExprToParenExpr(S, CastExpr);
-    if (Result.isInvalid()) return ExprError();
-    CastExpr = Result.get();
-  }
-
-  if (getLangOpts().CPlusPlus && !castType->isVoidType() &&
-      !getSourceManager().isInSystemMacro(LParenLoc))
-    Diag(LParenLoc, diag::warn_old_style_cast) << CastExpr->getSourceRange();
-
-  CheckTollFreeBridgeCast(castType, CastExpr);
-
-  CheckObjCBridgeRelatedCast(castType, CastExpr);
-
-  DiscardMisalignedMemberAddress(castType.getTypePtr(), CastExpr);
-
-  return BuildCStyleCastExpr(LParenLoc, castTInfo, RParenLoc, CastExpr);
-}
-
-ExprResult Sema::BuildVectorLiteral(SourceLocation LParenLoc,
-                                    SourceLocation RParenLoc, Expr *E,
-                                    TypeSourceInfo *TInfo) {
-  assert((isa<ParenListExpr>(E) || isa<ParenExpr>(E)) &&
-         "Expected paren or paren list expression");
-
-  Expr **exprs;
-  unsigned numExprs;
-  Expr *subExpr;
-  SourceLocation LiteralLParenLoc, LiteralRParenLoc;
-  if (ParenListExpr *PE = dyn_cast<ParenListExpr>(E)) {
-    LiteralLParenLoc = PE->getLParenLoc();
-    LiteralRParenLoc = PE->getRParenLoc();
-    exprs = PE->getExprs();
-    numExprs = PE->getNumExprs();
-  } else { // isa<ParenExpr> by assertion at function entrance
-    LiteralLParenLoc = cast<ParenExpr>(E)->getLParen();
-    LiteralRParenLoc = cast<ParenExpr>(E)->getRParen();
-    subExpr = cast<ParenExpr>(E)->getSubExpr();
-    exprs = &subExpr;
-    numExprs = 1;
-  }
-
-  QualType Ty = TInfo->getType();
-  assert(Ty->isVectorType() && "Expected vector type");
-
-  SmallVector<Expr *, 8> initExprs;
-  const VectorType *VTy = Ty->getAs<VectorType>();
-  unsigned numElems = Ty->getAs<VectorType>()->getNumElements();
-
-  // '(...)' form of vector initialization in AltiVec: the number of
-  // initializers must be one or must match the size of the vector.
-  // If a single value is specified in the initializer then it will be
-  // replicated to all the components of the vector
-  if (VTy->getVectorKind() == VectorType::AltiVecVector) {
-    // The number of initializers must be one or must match the size of the
-    // vector. If a single value is specified in the initializer then it will
-    // be replicated to all the components of the vector
-    if (numExprs == 1) {
-      QualType ElemTy = Ty->getAs<VectorType>()->getElementType();
-      ExprResult Literal = DefaultLvalueConversion(exprs[0]);
-      if (Literal.isInvalid())
-        return ExprError();
-      Literal = ImpCastExprToType(Literal.get(), ElemTy,
-                                  PrepareScalarCast(Literal, ElemTy));
-      return BuildCStyleCastExpr(LParenLoc, TInfo, RParenLoc, Literal.get());
-    }
-    else if (numExprs < numElems) {
-      Diag(E->getExprLoc(),
-           diag::err_incorrect_number_of_vector_initializers);
-      return ExprError();
-    }
-    else
-      initExprs.append(exprs, exprs + numExprs);
-  }
-  else {
-    // For OpenCL, when the number of initializers is a single value,
-    // it will be replicated to all components of the vector.
-    if (getLangOpts().OpenCL &&
-        VTy->getVectorKind() == VectorType::GenericVector &&
-        numExprs == 1) {
-        QualType ElemTy = Ty->getAs<VectorType>()->getElementType();
-        ExprResult Literal = DefaultLvalueConversion(exprs[0]);
-        if (Literal.isInvalid())
-          return ExprError();
-        Literal = ImpCastExprToType(Literal.get(), ElemTy,
-                                    PrepareScalarCast(Literal, ElemTy));
-        return BuildCStyleCastExpr(LParenLoc, TInfo, RParenLoc, Literal.get());
-    }
-
-    initExprs.append(exprs, exprs + numExprs);
-  }
-  // FIXME: This means that pretty-printing the final AST will produce curly
-  // braces instead of the original commas.
-  InitListExpr *initE = new (Context) InitListExpr(Context, LiteralLParenLoc,
-                                                   initExprs, LiteralRParenLoc);
-  initE->setType(Ty);
-  return BuildCompoundLiteralExpr(LParenLoc, TInfo, RParenLoc, initE);
-}
-
-/// This is not an AltiVec-style cast or or C++ direct-initialization, so turn
-/// the ParenListExpr into a sequence of comma binary operators.
-ExprResult
-Sema::MaybeConvertParenListExprToParenExpr(Scope *S, Expr *OrigExpr) {
-  ParenListExpr *E = dyn_cast<ParenListExpr>(OrigExpr);
-  if (!E)
-    return OrigExpr;
-
-  ExprResult Result(E->getExpr(0));
-
-  for (unsigned i = 1, e = E->getNumExprs(); i != e && !Result.isInvalid(); ++i)
-    Result = ActOnBinOp(S, E->getExprLoc(), tok::comma, Result.get(),
-                        E->getExpr(i));
-
-  if (Result.isInvalid()) return ExprError();
-
-  return ActOnParenExpr(E->getLParenLoc(), E->getRParenLoc(), Result.get());
-}
-
-ExprResult Sema::ActOnParenListExpr(SourceLocation L,
-                                    SourceLocation R,
-                                    MultiExprArg Val) {
-  return ParenListExpr::Create(Context, L, Val, R);
-}
-
-/// Emit a specialized diagnostic when one expression is a null pointer
-/// constant and the other is not a pointer.  Returns true if a diagnostic is
-/// emitted.
-bool Sema::DiagnoseConditionalForNull(Expr *LHSExpr, Expr *RHSExpr,
-                                      SourceLocation QuestionLoc) {
-  Expr *NullExpr = LHSExpr;
-  Expr *NonPointerExpr = RHSExpr;
-  Expr::NullPointerConstantKind NullKind =
-      NullExpr->isNullPointerConstant(Context,
-                                      Expr::NPC_ValueDependentIsNotNull);
-
-  if (NullKind == Expr::NPCK_NotNull) {
-    NullExpr = RHSExpr;
-    NonPointerExpr = LHSExpr;
-    NullKind =
-        NullExpr->isNullPointerConstant(Context,
-                                        Expr::NPC_ValueDependentIsNotNull);
-  }
-
-  if (NullKind == Expr::NPCK_NotNull)
-    return false;
-
-  if (NullKind == Expr::NPCK_ZeroExpression)
-    return false;
-
-  if (NullKind == Expr::NPCK_ZeroLiteral) {
-    // In this case, check to make sure that we got here from a "NULL"
-    // string in the source code.
-    NullExpr = NullExpr->IgnoreParenImpCasts();
-    SourceLocation loc = NullExpr->getExprLoc();
-    if (!findMacroSpelling(loc, "NULL"))
-      return false;
-  }
-
-  int DiagType = (NullKind == Expr::NPCK_CXX11_nullptr);
-  Diag(QuestionLoc, diag::err_typecheck_cond_incompatible_operands_null)
-      << NonPointerExpr->getType() << DiagType
-      << NonPointerExpr->getSourceRange();
-  return true;
-}
-
-/// Return false if the condition expression is valid, true otherwise.
-static bool checkCondition(Sema &S, Expr *Cond, SourceLocation QuestionLoc) {
-  QualType CondTy = Cond->getType();
-
-  // OpenCL v1.1 s6.3.i says the condition cannot be a floating point type.
-  if (S.getLangOpts().OpenCL && CondTy->isFloatingType()) {
-    S.Diag(QuestionLoc, diag::err_typecheck_cond_expect_nonfloat)
-      << CondTy << Cond->getSourceRange();
-    return true;
-  }
-
-  // C99 6.5.15p2
-  if (CondTy->isScalarType()) return false;
-
-  S.Diag(QuestionLoc, diag::err_typecheck_cond_expect_scalar)
-    << CondTy << Cond->getSourceRange();
-  return true;
-}
-
-/// Handle when one or both operands are void type.
-static QualType checkConditionalVoidType(Sema &S, ExprResult &LHS,
-                                         ExprResult &RHS) {
-    Expr *LHSExpr = LHS.get();
-    Expr *RHSExpr = RHS.get();
-
-    if (!LHSExpr->getType()->isVoidType())
-      S.Diag(RHSExpr->getBeginLoc(), diag::ext_typecheck_cond_one_void)
-          << RHSExpr->getSourceRange();
-    if (!RHSExpr->getType()->isVoidType())
-      S.Diag(LHSExpr->getBeginLoc(), diag::ext_typecheck_cond_one_void)
-          << LHSExpr->getSourceRange();
-    LHS = S.ImpCastExprToType(LHS.get(), S.Context.VoidTy, CK_ToVoid);
-    RHS = S.ImpCastExprToType(RHS.get(), S.Context.VoidTy, CK_ToVoid);
-    return S.Context.VoidTy;
-}
-
-/// Return false if the NullExpr can be promoted to PointerTy,
-/// true otherwise.
-static bool checkConditionalNullPointer(Sema &S, ExprResult &NullExpr,
-                                        QualType PointerTy) {
-  if ((!PointerTy->isAnyPointerType() && !PointerTy->isBlockPointerType()) ||
-      !NullExpr.get()->isNullPointerConstant(S.Context,
-                                            Expr::NPC_ValueDependentIsNull))
-    return true;
-
-  NullExpr = S.ImpCastExprToType(NullExpr.get(), PointerTy, CK_NullToPointer);
-  return false;
-}
-
-/// Checks compatibility between two pointers and return the resulting
-/// type.
-static QualType checkConditionalPointerCompatibility(Sema &S, ExprResult &LHS,
-                                                     ExprResult &RHS,
-                                                     SourceLocation Loc) {
-  QualType LHSTy = LHS.get()->getType();
-  QualType RHSTy = RHS.get()->getType();
-
-  if (S.Context.hasSameType(LHSTy, RHSTy)) {
-    // Two identical pointers types are always compatible.
-    return LHSTy;
-  }
-
-  QualType lhptee, rhptee;
-
-  // Get the pointee types.
-  bool IsBlockPointer = false;
-  if (const BlockPointerType *LHSBTy = LHSTy->getAs<BlockPointerType>()) {
-    lhptee = LHSBTy->getPointeeType();
-    rhptee = RHSTy->castAs<BlockPointerType>()->getPointeeType();
-    IsBlockPointer = true;
-  } else {
-    lhptee = LHSTy->castAs<PointerType>()->getPointeeType();
-    rhptee = RHSTy->castAs<PointerType>()->getPointeeType();
-  }
-
-  // C99 6.5.15p6: If both operands are pointers to compatible types or to
-  // differently qualified versions of compatible types, the result type is
-  // a pointer to an appropriately qualified version of the composite
-  // type.
-
-  // Only CVR-qualifiers exist in the standard, and the differently-qualified
-  // clause doesn't make sense for our extensions. E.g. address space 2 should
-  // be incompatible with address space 3: they may live on different devices or
-  // anything.
-  Qualifiers lhQual = lhptee.getQualifiers();
-  Qualifiers rhQual = rhptee.getQualifiers();
-
-  LangAS ResultAddrSpace = LangAS::Default;
-  LangAS LAddrSpace = lhQual.getAddressSpace();
-  LangAS RAddrSpace = rhQual.getAddressSpace();
-
-  // OpenCL v1.1 s6.5 - Conversion between pointers to distinct address
-  // spaces is disallowed.
-  if (lhQual.isAddressSpaceSupersetOf(rhQual))
-    ResultAddrSpace = LAddrSpace;
-  else if (rhQual.isAddressSpaceSupersetOf(lhQual))
-    ResultAddrSpace = RAddrSpace;
-  else {
-    S.Diag(Loc, diag::err_typecheck_op_on_nonoverlapping_address_space_pointers)
-        << LHSTy << RHSTy << 2 << LHS.get()->getSourceRange()
-        << RHS.get()->getSourceRange();
-    return QualType();
-  }
-
-  unsigned MergedCVRQual = lhQual.getCVRQualifiers() | rhQual.getCVRQualifiers();
-  auto LHSCastKind = CK_BitCast, RHSCastKind = CK_BitCast;
-  lhQual.removeCVRQualifiers();
-  rhQual.removeCVRQualifiers();
-
-  // OpenCL v2.0 specification doesn't extend compatibility of type qualifiers
-  // (C99 6.7.3) for address spaces. We assume that the check should behave in
-  // the same manner as it's defined for CVR qualifiers, so for OpenCL two
-  // qual types are compatible iff
-  //  * corresponded types are compatible
-  //  * CVR qualifiers are equal
-  //  * address spaces are equal
-  // Thus for conditional operator we merge CVR and address space unqualified
-  // pointees and if there is a composite type we return a pointer to it with
-  // merged qualifiers.
-  LHSCastKind =
-      LAddrSpace == ResultAddrSpace ? CK_BitCast : CK_AddressSpaceConversion;
-  RHSCastKind =
-      RAddrSpace == ResultAddrSpace ? CK_BitCast : CK_AddressSpaceConversion;
-  lhQual.removeAddressSpace();
-  rhQual.removeAddressSpace();
-
-  lhptee = S.Context.getQualifiedType(lhptee.getUnqualifiedType(), lhQual);
-  rhptee = S.Context.getQualifiedType(rhptee.getUnqualifiedType(), rhQual);
-
-  QualType CompositeTy = S.Context.mergeTypes(lhptee, rhptee);
-
-  if (CompositeTy.isNull()) {
-    // In this situation, we assume void* type. No especially good
-    // reason, but this is what gcc does, and we do have to pick
-    // to get a consistent AST.
-    QualType incompatTy;
-    incompatTy = S.Context.getPointerType(
-        S.Context.getAddrSpaceQualType(S.Context.VoidTy, ResultAddrSpace));
-    LHS = S.ImpCastExprToType(LHS.get(), incompatTy, LHSCastKind);
-    RHS = S.ImpCastExprToType(RHS.get(), incompatTy, RHSCastKind);
-
-    // FIXME: For OpenCL the warning emission and cast to void* leaves a room
-    // for casts between types with incompatible address space qualifiers.
-    // For the following code the compiler produces casts between global and
-    // local address spaces of the corresponded innermost pointees:
-    // local int *global *a;
-    // global int *global *b;
-    // a = (0 ? a : b); // see C99 6.5.16.1.p1.
-    S.Diag(Loc, diag::ext_typecheck_cond_incompatible_pointers)
-        << LHSTy << RHSTy << LHS.get()->getSourceRange()
-        << RHS.get()->getSourceRange();
-
-    return incompatTy;
-  }
-
-  // The pointer types are compatible.
-  // In case of OpenCL ResultTy should have the address space qualifier
-  // which is a superset of address spaces of both the 2nd and the 3rd
-  // operands of the conditional operator.
-  QualType ResultTy = [&, ResultAddrSpace]() {
-    if (S.getLangOpts().OpenCL) {
-      Qualifiers CompositeQuals = CompositeTy.getQualifiers();
-      CompositeQuals.setAddressSpace(ResultAddrSpace);
-      return S.Context
-          .getQualifiedType(CompositeTy.getUnqualifiedType(), CompositeQuals)
-          .withCVRQualifiers(MergedCVRQual);
-    }
-    return CompositeTy.withCVRQualifiers(MergedCVRQual);
-  }();
-  if (IsBlockPointer)
-    ResultTy = S.Context.getBlockPointerType(ResultTy);
-  else
-    ResultTy = S.Context.getPointerType(ResultTy);
-
-  LHS = S.ImpCastExprToType(LHS.get(), ResultTy, LHSCastKind);
-  RHS = S.ImpCastExprToType(RHS.get(), ResultTy, RHSCastKind);
-  return ResultTy;
-}
-
-/// Return the resulting type when the operands are both block pointers.
-static QualType checkConditionalBlockPointerCompatibility(Sema &S,
-                                                          ExprResult &LHS,
-                                                          ExprResult &RHS,
-                                                          SourceLocation Loc) {
-  QualType LHSTy = LHS.get()->getType();
-  QualType RHSTy = RHS.get()->getType();
-
-  if (!LHSTy->isBlockPointerType() || !RHSTy->isBlockPointerType()) {
-    if (LHSTy->isVoidPointerType() || RHSTy->isVoidPointerType()) {
-      QualType destType = S.Context.getPointerType(S.Context.VoidTy);
-      LHS = S.ImpCastExprToType(LHS.get(), destType, CK_BitCast);
-      RHS = S.ImpCastExprToType(RHS.get(), destType, CK_BitCast);
-      return destType;
-    }
-    S.Diag(Loc, diag::err_typecheck_cond_incompatible_operands)
-      << LHSTy << RHSTy << LHS.get()->getSourceRange()
-      << RHS.get()->getSourceRange();
-    return QualType();
-  }
-
-  // We have 2 block pointer types.
-  return checkConditionalPointerCompatibility(S, LHS, RHS, Loc);
-}
-
-/// Return the resulting type when the operands are both pointers.
-static QualType
-checkConditionalObjectPointersCompatibility(Sema &S, ExprResult &LHS,
-                                            ExprResult &RHS,
-                                            SourceLocation Loc) {
-  // get the pointer types
-  QualType LHSTy = LHS.get()->getType();
-  QualType RHSTy = RHS.get()->getType();
-
-  // get the "pointed to" types
-  QualType lhptee = LHSTy->getAs<PointerType>()->getPointeeType();
-  QualType rhptee = RHSTy->getAs<PointerType>()->getPointeeType();
-
-  // ignore qualifiers on void (C99 6.5.15p3, clause 6)
-  if (lhptee->isVoidType() && rhptee->isIncompleteOrObjectType()) {
-    // Figure out necessary qualifiers (C99 6.5.15p6)
-    QualType destPointee
-      = S.Context.getQualifiedType(lhptee, rhptee.getQualifiers());
-    QualType destType = S.Context.getPointerType(destPointee);
-    // Add qualifiers if necessary.
-    LHS = S.ImpCastExprToType(LHS.get(), destType, CK_NoOp);
-    // Promote to void*.
-    RHS = S.ImpCastExprToType(RHS.get(), destType, CK_BitCast);
-    return destType;
-  }
-  if (rhptee->isVoidType() && lhptee->isIncompleteOrObjectType()) {
-    QualType destPointee
-      = S.Context.getQualifiedType(rhptee, lhptee.getQualifiers());
-    QualType destType = S.Context.getPointerType(destPointee);
-    // Add qualifiers if necessary.
-    RHS = S.ImpCastExprToType(RHS.get(), destType, CK_NoOp);
-    // Promote to void*.
-    LHS = S.ImpCastExprToType(LHS.get(), destType, CK_BitCast);
-    return destType;
-  }
-
-  return checkConditionalPointerCompatibility(S, LHS, RHS, Loc);
-}
-
-/// Return false if the first expression is not an integer and the second
-/// expression is not a pointer, true otherwise.
-static bool checkPointerIntegerMismatch(Sema &S, ExprResult &Int,
-                                        Expr* PointerExpr, SourceLocation Loc,
-                                        bool IsIntFirstExpr) {
-  if (!PointerExpr->getType()->isPointerType() ||
-      !Int.get()->getType()->isIntegerType())
-    return false;
-
-  Expr *Expr1 = IsIntFirstExpr ? Int.get() : PointerExpr;
-  Expr *Expr2 = IsIntFirstExpr ? PointerExpr : Int.get();
-
-  S.Diag(Loc, diag::ext_typecheck_cond_pointer_integer_mismatch)
-    << Expr1->getType() << Expr2->getType()
-    << Expr1->getSourceRange() << Expr2->getSourceRange();
-  Int = S.ImpCastExprToType(Int.get(), PointerExpr->getType(),
-                            CK_IntegralToPointer);
-  return true;
-}
-
-/// Simple conversion between integer and floating point types.
-///
-/// Used when handling the OpenCL conditional operator where the
-/// condition is a vector while the other operands are scalar.
-///
-/// OpenCL v1.1 s6.3.i and s6.11.6 together require that the scalar
-/// types are either integer or floating type. Between the two
-/// operands, the type with the higher rank is defined as the "result
-/// type". The other operand needs to be promoted to the same type. No
-/// other type promotion is allowed. We cannot use
-/// UsualArithmeticConversions() for this purpose, since it always
-/// promotes promotable types.
-static QualType OpenCLArithmeticConversions(Sema &S, ExprResult &LHS,
-                                            ExprResult &RHS,
-                                            SourceLocation QuestionLoc) {
-  LHS = S.DefaultFunctionArrayLvalueConversion(LHS.get());
-  if (LHS.isInvalid())
-    return QualType();
-  RHS = S.DefaultFunctionArrayLvalueConversion(RHS.get());
-  if (RHS.isInvalid())
-    return QualType();
-
-  // For conversion purposes, we ignore any qualifiers.
-  // For example, "const float" and "float" are equivalent.
-  QualType LHSType =
-    S.Context.getCanonicalType(LHS.get()->getType()).getUnqualifiedType();
-  QualType RHSType =
-    S.Context.getCanonicalType(RHS.get()->getType()).getUnqualifiedType();
-
-  if (!LHSType->isIntegerType() && !LHSType->isRealFloatingType()) {
-    S.Diag(QuestionLoc, diag::err_typecheck_cond_expect_int_float)
-      << LHSType << LHS.get()->getSourceRange();
-    return QualType();
-  }
-
-  if (!RHSType->isIntegerType() && !RHSType->isRealFloatingType()) {
-    S.Diag(QuestionLoc, diag::err_typecheck_cond_expect_int_float)
-      << RHSType << RHS.get()->getSourceRange();
-    return QualType();
-  }
-
-  // If both types are identical, no conversion is needed.
-  if (LHSType == RHSType)
-    return LHSType;
-
-  // Now handle "real" floating types (i.e. float, double, long double).
-  if (LHSType->isRealFloatingType() || RHSType->isRealFloatingType())
-    return handleFloatConversion(S, LHS, RHS, LHSType, RHSType,
-                                 /*IsCompAssign = */ false);
-
-  // Finally, we have two differing integer types.
-  return handleIntegerConversion<doIntegralCast, doIntegralCast>
-  (S, LHS, RHS, LHSType, RHSType, /*IsCompAssign = */ false);
-}
-
-/// Convert scalar operands to a vector that matches the
-///        condition in length.
-///
-/// Used when handling the OpenCL conditional operator where the
-/// condition is a vector while the other operands are scalar.
-///
-/// We first compute the "result type" for the scalar operands
-/// according to OpenCL v1.1 s6.3.i. Both operands are then converted
-/// into a vector of that type where the length matches the condition
-/// vector type. s6.11.6 requires that the element types of the result
-/// and the condition must have the same number of bits.
-static QualType
-OpenCLConvertScalarsToVectors(Sema &S, ExprResult &LHS, ExprResult &RHS,
-                              QualType CondTy, SourceLocation QuestionLoc) {
-  QualType ResTy = OpenCLArithmeticConversions(S, LHS, RHS, QuestionLoc);
-  if (ResTy.isNull()) return QualType();
-
-  const VectorType *CV = CondTy->getAs<VectorType>();
-  assert(CV);
-
-  // Determine the vector result type
-  unsigned NumElements = CV->getNumElements();
-  QualType VectorTy = S.Context.getExtVectorType(ResTy, NumElements);
-
-  // Ensure that all types have the same number of bits
-  if (S.Context.getTypeSize(CV->getElementType())
-      != S.Context.getTypeSize(ResTy)) {
-    // Since VectorTy is created internally, it does not pretty print
-    // with an OpenCL name. Instead, we just print a description.
-    std::string EleTyName = ResTy.getUnqualifiedType().getAsString();
-    SmallString<64> Str;
-    llvm::raw_svector_ostream OS(Str);
-    OS << "(vector of " << NumElements << " '" << EleTyName << "' values)";
-    S.Diag(QuestionLoc, diag::err_conditional_vector_element_size)
-      << CondTy << OS.str();
-    return QualType();
-  }
-
-  // Convert operands to the vector result type
-  LHS = S.ImpCastExprToType(LHS.get(), VectorTy, CK_VectorSplat);
-  RHS = S.ImpCastExprToType(RHS.get(), VectorTy, CK_VectorSplat);
-
-  return VectorTy;
-}
-
-/// Return false if this is a valid OpenCL condition vector
-static bool checkOpenCLConditionVector(Sema &S, Expr *Cond,
-                                       SourceLocation QuestionLoc) {
-  // OpenCL v1.1 s6.11.6 says the elements of the vector must be of
-  // integral type.
-  const VectorType *CondTy = Cond->getType()->getAs<VectorType>();
-  assert(CondTy);
-  QualType EleTy = CondTy->getElementType();
-  if (EleTy->isIntegerType()) return false;
-
-  S.Diag(QuestionLoc, diag::err_typecheck_cond_expect_nonfloat)
-    << Cond->getType() << Cond->getSourceRange();
-  return true;
-}
-
-/// Return false if the vector condition type and the vector
-///        result type are compatible.
-///
-/// OpenCL v1.1 s6.11.6 requires that both vector types have the same
-/// number of elements, and their element types have the same number
-/// of bits.
-static bool checkVectorResult(Sema &S, QualType CondTy, QualType VecResTy,
-                              SourceLocation QuestionLoc) {
-  const VectorType *CV = CondTy->getAs<VectorType>();
-  const VectorType *RV = VecResTy->getAs<VectorType>();
-  assert(CV && RV);
-
-  if (CV->getNumElements() != RV->getNumElements()) {
-    S.Diag(QuestionLoc, diag::err_conditional_vector_size)
-      << CondTy << VecResTy;
-    return true;
-  }
-
-  QualType CVE = CV->getElementType();
-  QualType RVE = RV->getElementType();
-
-  if (S.Context.getTypeSize(CVE) != S.Context.getTypeSize(RVE)) {
-    S.Diag(QuestionLoc, diag::err_conditional_vector_element_size)
-      << CondTy << VecResTy;
-    return true;
-  }
-
-  return false;
-}
-
-/// Return the resulting type for the conditional operator in
-///        OpenCL (aka "ternary selection operator", OpenCL v1.1
-///        s6.3.i) when the condition is a vector type.
-static QualType
-OpenCLCheckVectorConditional(Sema &S, ExprResult &Cond,
-                             ExprResult &LHS, ExprResult &RHS,
-                             SourceLocation QuestionLoc) {
-  Cond = S.DefaultFunctionArrayLvalueConversion(Cond.get());
-  if (Cond.isInvalid())
-    return QualType();
-  QualType CondTy = Cond.get()->getType();
-
-  if (checkOpenCLConditionVector(S, Cond.get(), QuestionLoc))
-    return QualType();
-
-  // If either operand is a vector then find the vector type of the
-  // result as specified in OpenCL v1.1 s6.3.i.
-  if (LHS.get()->getType()->isVectorType() ||
-      RHS.get()->getType()->isVectorType()) {
-    QualType VecResTy = S.CheckVectorOperands(LHS, RHS, QuestionLoc,
-                                              /*isCompAssign*/false,
-                                              /*AllowBothBool*/true,
-                                              /*AllowBoolConversions*/false);
-    if (VecResTy.isNull()) return QualType();
-    // The result type must match the condition type as specified in
-    // OpenCL v1.1 s6.11.6.
-    if (checkVectorResult(S, CondTy, VecResTy, QuestionLoc))
-      return QualType();
-    return VecResTy;
-  }
-
-  // Both operands are scalar.
-  return OpenCLConvertScalarsToVectors(S, LHS, RHS, CondTy, QuestionLoc);
-}
-
-/// Return true if the Expr is block type
-static bool checkBlockType(Sema &S, const Expr *E) {
-  if (const CallExpr *CE = dyn_cast<CallExpr>(E)) {
-    QualType Ty = CE->getCallee()->getType();
-    if (Ty->isBlockPointerType()) {
-      S.Diag(E->getExprLoc(), diag::err_opencl_ternary_with_block);
-      return true;
-    }
-  }
-  return false;
-}
-
-/// Note that LHS is not null here, even if this is the gnu "x ?: y" extension.
-/// In that case, LHS = cond.
-/// C99 6.5.15
-QualType Sema::CheckConditionalOperands(ExprResult &Cond, ExprResult &LHS,
-                                        ExprResult &RHS, ExprValueKind &VK,
-                                        ExprObjectKind &OK,
-                                        SourceLocation QuestionLoc) {
-
-  ExprResult LHSResult = CheckPlaceholderExpr(LHS.get());
-  if (!LHSResult.isUsable()) return QualType();
-  LHS = LHSResult;
-
-  ExprResult RHSResult = CheckPlaceholderExpr(RHS.get());
-  if (!RHSResult.isUsable()) return QualType();
-  RHS = RHSResult;
-
-  // C++ is sufficiently different to merit its own checker.
-  if (getLangOpts().CPlusPlus)
-    return CXXCheckConditionalOperands(Cond, LHS, RHS, VK, OK, QuestionLoc);
-
-  VK = VK_RValue;
-  OK = OK_Ordinary;
-
-  // The OpenCL operator with a vector condition is sufficiently
-  // different to merit its own checker.
-  if (getLangOpts().OpenCL && Cond.get()->getType()->isVectorType())
-    return OpenCLCheckVectorConditional(*this, Cond, LHS, RHS, QuestionLoc);
-
-  // First, check the condition.
-  Cond = UsualUnaryConversions(Cond.get());
-  if (Cond.isInvalid())
-    return QualType();
-  if (checkCondition(*this, Cond.get(), QuestionLoc))
-    return QualType();
-
-  // Now check the two expressions.
-  if (LHS.get()->getType()->isVectorType() ||
-      RHS.get()->getType()->isVectorType())
-    return CheckVectorOperands(LHS, RHS, QuestionLoc, /*isCompAssign*/false,
-                               /*AllowBothBool*/true,
-                               /*AllowBoolConversions*/false);
-
-  QualType ResTy = UsualArithmeticConversions(LHS, RHS);
-  if (LHS.isInvalid() || RHS.isInvalid())
-    return QualType();
-
-  QualType LHSTy = LHS.get()->getType();
-  QualType RHSTy = RHS.get()->getType();
-
-  // Diagnose attempts to convert between __float128 and long double where
-  // such conversions currently can't be handled.
-  if (unsupportedTypeConversion(*this, LHSTy, RHSTy)) {
-    Diag(QuestionLoc,
-         diag::err_typecheck_cond_incompatible_operands) << LHSTy << RHSTy
-      << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
-    return QualType();
-  }
-
-  // OpenCL v2.0 s6.12.5 - Blocks cannot be used as expressions of the ternary
-  // selection operator (?:).
-  if (getLangOpts().OpenCL &&
-      (checkBlockType(*this, LHS.get()) | checkBlockType(*this, RHS.get()))) {
-    return QualType();
-  }
-
-  // If both operands have arithmetic type, do the usual arithmetic conversions
-  // to find a common type: C99 6.5.15p3,5.
-  if (LHSTy->isArithmeticType() && RHSTy->isArithmeticType()) {
-    LHS = ImpCastExprToType(LHS.get(), ResTy, PrepareScalarCast(LHS, ResTy));
-    RHS = ImpCastExprToType(RHS.get(), ResTy, PrepareScalarCast(RHS, ResTy));
-
-    return ResTy;
-  }
-
-  // If both operands are the same structure or union type, the result is that
-  // type.
-  if (const RecordType *LHSRT = LHSTy->getAs<RecordType>()) {    // C99 6.5.15p3
-    if (const RecordType *RHSRT = RHSTy->getAs<RecordType>())
-      if (LHSRT->getDecl() == RHSRT->getDecl())
-        // "If both the operands have structure or union type, the result has
-        // that type."  This implies that CV qualifiers are dropped.
-        return LHSTy.getUnqualifiedType();
-    // FIXME: Type of conditional expression must be complete in C mode.
-  }
-
-  // C99 6.5.15p5: "If both operands have void type, the result has void type."
-  // The following || allows only one side to be void (a GCC-ism).
-  if (LHSTy->isVoidType() || RHSTy->isVoidType()) {
-    return checkConditionalVoidType(*this, LHS, RHS);
-  }
-
-  // C99 6.5.15p6 - "if one operand is a null pointer constant, the result has
-  // the type of the other operand."
-  if (!checkConditionalNullPointer(*this, RHS, LHSTy)) return LHSTy;
-  if (!checkConditionalNullPointer(*this, LHS, RHSTy)) return RHSTy;
-
-  // All objective-c pointer type analysis is done here.
-  QualType compositeType = FindCompositeObjCPointerType(LHS, RHS,
-                                                        QuestionLoc);
-  if (LHS.isInvalid() || RHS.isInvalid())
-    return QualType();
-  if (!compositeType.isNull())
-    return compositeType;
-
-
-  // Handle block pointer types.
-  if (LHSTy->isBlockPointerType() || RHSTy->isBlockPointerType())
-    return checkConditionalBlockPointerCompatibility(*this, LHS, RHS,
-                                                     QuestionLoc);
-
-  // Check constraints for C object pointers types (C99 6.5.15p3,6).
-  if (LHSTy->isPointerType() && RHSTy->isPointerType())
-    return checkConditionalObjectPointersCompatibility(*this, LHS, RHS,
-                                                       QuestionLoc);
-
-  // GCC compatibility: soften pointer/integer mismatch.  Note that
-  // null pointers have been filtered out by this point.
-  if (checkPointerIntegerMismatch(*this, LHS, RHS.get(), QuestionLoc,
-      /*isIntFirstExpr=*/true))
-    return RHSTy;
-  if (checkPointerIntegerMismatch(*this, RHS, LHS.get(), QuestionLoc,
-      /*isIntFirstExpr=*/false))
-    return LHSTy;
-
-  // Emit a better diagnostic if one of the expressions is a null pointer
-  // constant and the other is not a pointer type. In this case, the user most
-  // likely forgot to take the address of the other expression.
-  if (DiagnoseConditionalForNull(LHS.get(), RHS.get(), QuestionLoc))
-    return QualType();
-
-  // Otherwise, the operands are not compatible.
-  Diag(QuestionLoc, diag::err_typecheck_cond_incompatible_operands)
-    << LHSTy << RHSTy << LHS.get()->getSourceRange()
-    << RHS.get()->getSourceRange();
-  return QualType();
-}
-
-/// FindCompositeObjCPointerType - Helper method to find composite type of
-/// two objective-c pointer types of the two input expressions.
-QualType Sema::FindCompositeObjCPointerType(ExprResult &LHS, ExprResult &RHS,
-                                            SourceLocation QuestionLoc) {
-  QualType LHSTy = LHS.get()->getType();
-  QualType RHSTy = RHS.get()->getType();
-
-  // Handle things like Class and struct objc_class*.  Here we case the result
-  // to the pseudo-builtin, because that will be implicitly cast back to the
-  // redefinition type if an attempt is made to access its fields.
-  if (LHSTy->isObjCClassType() &&
-      (Context.hasSameType(RHSTy, Context.getObjCClassRedefinitionType()))) {
-    RHS = ImpCastExprToType(RHS.get(), LHSTy, CK_CPointerToObjCPointerCast);
-    return LHSTy;
-  }
-  if (RHSTy->isObjCClassType() &&
-      (Context.hasSameType(LHSTy, Context.getObjCClassRedefinitionType()))) {
-    LHS = ImpCastExprToType(LHS.get(), RHSTy, CK_CPointerToObjCPointerCast);
-    return RHSTy;
-  }
-  // And the same for struct objc_object* / id
-  if (LHSTy->isObjCIdType() &&
-      (Context.hasSameType(RHSTy, Context.getObjCIdRedefinitionType()))) {
-    RHS = ImpCastExprToType(RHS.get(), LHSTy, CK_CPointerToObjCPointerCast);
-    return LHSTy;
-  }
-  if (RHSTy->isObjCIdType() &&
-      (Context.hasSameType(LHSTy, Context.getObjCIdRedefinitionType()))) {
-    LHS = ImpCastExprToType(LHS.get(), RHSTy, CK_CPointerToObjCPointerCast);
-    return RHSTy;
-  }
-  // And the same for struct objc_selector* / SEL
-  if (Context.isObjCSelType(LHSTy) &&
-      (Context.hasSameType(RHSTy, Context.getObjCSelRedefinitionType()))) {
-    RHS = ImpCastExprToType(RHS.get(), LHSTy, CK_BitCast);
-    return LHSTy;
-  }
-  if (Context.isObjCSelType(RHSTy) &&
-      (Context.hasSameType(LHSTy, Context.getObjCSelRedefinitionType()))) {
-    LHS = ImpCastExprToType(LHS.get(), RHSTy, CK_BitCast);
-    return RHSTy;
-  }
-  // Check constraints for Objective-C object pointers types.
-  if (LHSTy->isObjCObjectPointerType() && RHSTy->isObjCObjectPointerType()) {
-
-    if (Context.getCanonicalType(LHSTy) == Context.getCanonicalType(RHSTy)) {
-      // Two identical object pointer types are always compatible.
-      return LHSTy;
-    }
-    const ObjCObjectPointerType *LHSOPT = LHSTy->castAs<ObjCObjectPointerType>();
-    const ObjCObjectPointerType *RHSOPT = RHSTy->castAs<ObjCObjectPointerType>();
-    QualType compositeType = LHSTy;
-
-    // If both operands are interfaces and either operand can be
-    // assigned to the other, use that type as the composite
-    // type. This allows
-    //   xxx ? (A*) a : (B*) b
-    // where B is a subclass of A.
-    //
-    // Additionally, as for assignment, if either type is 'id'
-    // allow silent coercion. Finally, if the types are
-    // incompatible then make sure to use 'id' as the composite
-    // type so the result is acceptable for sending messages to.
-
-    // FIXME: Consider unifying with 'areComparableObjCPointerTypes'.
-    // It could return the composite type.
-    if (!(compositeType =
-          Context.areCommonBaseCompatible(LHSOPT, RHSOPT)).isNull()) {
-      // Nothing more to do.
-    } else if (Context.canAssignObjCInterfaces(LHSOPT, RHSOPT)) {
-      compositeType = RHSOPT->isObjCBuiltinType() ? RHSTy : LHSTy;
-    } else if (Context.canAssignObjCInterfaces(RHSOPT, LHSOPT)) {
-      compositeType = LHSOPT->isObjCBuiltinType() ? LHSTy : RHSTy;
-    } else if ((LHSTy->isObjCQualifiedIdType() ||
-                RHSTy->isObjCQualifiedIdType()) &&
-               Context.ObjCQualifiedIdTypesAreCompatible(LHSTy, RHSTy, true)) {
-      // Need to handle "id<xx>" explicitly.
-      // GCC allows qualified id and any Objective-C type to devolve to
-      // id. Currently localizing to here until clear this should be
-      // part of ObjCQualifiedIdTypesAreCompatible.
-      compositeType = Context.getObjCIdType();
-    } else if (LHSTy->isObjCIdType() || RHSTy->isObjCIdType()) {
-      compositeType = Context.getObjCIdType();
-    } else {
-      Diag(QuestionLoc, diag::ext_typecheck_cond_incompatible_operands)
-      << LHSTy << RHSTy
-      << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
-      QualType incompatTy = Context.getObjCIdType();
-      LHS = ImpCastExprToType(LHS.get(), incompatTy, CK_BitCast);
-      RHS = ImpCastExprToType(RHS.get(), incompatTy, CK_BitCast);
-      return incompatTy;
-    }
-    // The object pointer types are compatible.
-    LHS = ImpCastExprToType(LHS.get(), compositeType, CK_BitCast);
-    RHS = ImpCastExprToType(RHS.get(), compositeType, CK_BitCast);
-    return compositeType;
-  }
-  // Check Objective-C object pointer types and 'void *'
-  if (LHSTy->isVoidPointerType() && RHSTy->isObjCObjectPointerType()) {
-    if (getLangOpts().ObjCAutoRefCount) {
-      // ARC forbids the implicit conversion of object pointers to 'void *',
-      // so these types are not compatible.
-      Diag(QuestionLoc, diag::err_cond_voidptr_arc) << LHSTy << RHSTy
-          << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
-      LHS = RHS = true;
-      return QualType();
-    }
-    QualType lhptee = LHSTy->getAs<PointerType>()->getPointeeType();
-    QualType rhptee = RHSTy->getAs<ObjCObjectPointerType>()->getPointeeType();
-    QualType destPointee
-    = Context.getQualifiedType(lhptee, rhptee.getQualifiers());
-    QualType destType = Context.getPointerType(destPointee);
-    // Add qualifiers if necessary.
-    LHS = ImpCastExprToType(LHS.get(), destType, CK_NoOp);
-    // Promote to void*.
-    RHS = ImpCastExprToType(RHS.get(), destType, CK_BitCast);
-    return destType;
-  }
-  if (LHSTy->isObjCObjectPointerType() && RHSTy->isVoidPointerType()) {
-    if (getLangOpts().ObjCAutoRefCount) {
-      // ARC forbids the implicit conversion of object pointers to 'void *',
-      // so these types are not compatible.
-      Diag(QuestionLoc, diag::err_cond_voidptr_arc) << LHSTy << RHSTy
-          << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
-      LHS = RHS = true;
-      return QualType();
-    }
-    QualType lhptee = LHSTy->getAs<ObjCObjectPointerType>()->getPointeeType();
-    QualType rhptee = RHSTy->getAs<PointerType>()->getPointeeType();
-    QualType destPointee
-    = Context.getQualifiedType(rhptee, lhptee.getQualifiers());
-    QualType destType = Context.getPointerType(destPointee);
-    // Add qualifiers if necessary.
-    RHS = ImpCastExprToType(RHS.get(), destType, CK_NoOp);
-    // Promote to void*.
-    LHS = ImpCastExprToType(LHS.get(), destType, CK_BitCast);
-    return destType;
-  }
-  return QualType();
-}
-
-/// SuggestParentheses - Emit a note with a fixit hint that wraps
-/// ParenRange in parentheses.
-static void SuggestParentheses(Sema &Self, SourceLocation Loc,
-                               const PartialDiagnostic &Note,
-                               SourceRange ParenRange) {
-  SourceLocation EndLoc = Self.getLocForEndOfToken(ParenRange.getEnd());
-  if (ParenRange.getBegin().isFileID() && ParenRange.getEnd().isFileID() &&
-      EndLoc.isValid()) {
-    Self.Diag(Loc, Note)
-      << FixItHint::CreateInsertion(ParenRange.getBegin(), "(")
-      << FixItHint::CreateInsertion(EndLoc, ")");
-  } else {
-    // We can't display the parentheses, so just show the bare note.
-    Self.Diag(Loc, Note) << ParenRange;
-  }
-}
-
-static bool IsArithmeticOp(BinaryOperatorKind Opc) {
-  return BinaryOperator::isAdditiveOp(Opc) ||
-         BinaryOperator::isMultiplicativeOp(Opc) ||
-         BinaryOperator::isShiftOp(Opc);
-}
-
-/// IsArithmeticBinaryExpr - Returns true if E is an arithmetic binary
-/// expression, either using a built-in or overloaded operator,
-/// and sets *OpCode to the opcode and *RHSExprs to the right-hand side
-/// expression.
-static bool IsArithmeticBinaryExpr(Expr *E, BinaryOperatorKind *Opcode,
-                                   Expr **RHSExprs) {
-  // Don't strip parenthesis: we should not warn if E is in parenthesis.
-  E = E->IgnoreImpCasts();
-  E = E->IgnoreConversionOperator();
-  E = E->IgnoreImpCasts();
-  if (auto *MTE = dyn_cast<MaterializeTemporaryExpr>(E)) {
-    E = MTE->GetTemporaryExpr();
-    E = E->IgnoreImpCasts();
-  }
-
-  // Built-in binary operator.
-  if (BinaryOperator *OP = dyn_cast<BinaryOperator>(E)) {
-    if (IsArithmeticOp(OP->getOpcode())) {
-      *Opcode = OP->getOpcode();
-      *RHSExprs = OP->getRHS();
-      return true;
-    }
-  }
-
-  // Overloaded operator.
-  if (CXXOperatorCallExpr *Call = dyn_cast<CXXOperatorCallExpr>(E)) {
-    if (Call->getNumArgs() != 2)
-      return false;
-
-    // Make sure this is really a binary operator that is safe to pass into
-    // BinaryOperator::getOverloadedOpcode(), e.g. it's not a subscript op.
-    OverloadedOperatorKind OO = Call->getOperator();
-    if (OO < OO_Plus || OO > OO_Arrow ||
-        OO == OO_PlusPlus || OO == OO_MinusMinus)
-      return false;
-
-    BinaryOperatorKind OpKind = BinaryOperator::getOverloadedOpcode(OO);
-    if (IsArithmeticOp(OpKind)) {
-      *Opcode = OpKind;
-      *RHSExprs = Call->getArg(1);
-      return true;
-    }
-  }
-
-  return false;
-}
-
-/// ExprLooksBoolean - Returns true if E looks boolean, i.e. it has boolean type
-/// or is a logical expression such as (x==y) which has int type, but is
-/// commonly interpreted as boolean.
-static bool ExprLooksBoolean(Expr *E) {
-  E = E->IgnoreParenImpCasts();
-
-  if (E->getType()->isBooleanType())
-    return true;
-  if (BinaryOperator *OP = dyn_cast<BinaryOperator>(E))
-    return OP->isComparisonOp() || OP->isLogicalOp();
-  if (UnaryOperator *OP = dyn_cast<UnaryOperator>(E))
-    return OP->getOpcode() == UO_LNot;
-  if (E->getType()->isPointerType())
-    return true;
-  // FIXME: What about overloaded operator calls returning "unspecified boolean
-  // type"s (commonly pointer-to-members)?
-
-  return false;
-}
-
-/// DiagnoseConditionalPrecedence - Emit a warning when a conditional operator
-/// and binary operator are mixed in a way that suggests the programmer assumed
-/// the conditional operator has higher precedence, for example:
-/// "int x = a + someBinaryCondition ? 1 : 2".
-static void DiagnoseConditionalPrecedence(Sema &Self,
-                                          SourceLocation OpLoc,
-                                          Expr *Condition,
-                                          Expr *LHSExpr,
-                                          Expr *RHSExpr) {
-  BinaryOperatorKind CondOpcode;
-  Expr *CondRHS;
-
-  if (!IsArithmeticBinaryExpr(Condition, &CondOpcode, &CondRHS))
-    return;
-  if (!ExprLooksBoolean(CondRHS))
-    return;
-
-  // The condition is an arithmetic binary expression, with a right-
-  // hand side that looks boolean, so warn.
-
-  Self.Diag(OpLoc, diag::warn_precedence_conditional)
-      << Condition->getSourceRange()
-      << BinaryOperator::getOpcodeStr(CondOpcode);
-
-  SuggestParentheses(
-      Self, OpLoc,
-      Self.PDiag(diag::note_precedence_silence)
-          << BinaryOperator::getOpcodeStr(CondOpcode),
-      SourceRange(Condition->getBeginLoc(), Condition->getEndLoc()));
-
-  SuggestParentheses(Self, OpLoc,
-                     Self.PDiag(diag::note_precedence_conditional_first),
-                     SourceRange(CondRHS->getBeginLoc(), RHSExpr->getEndLoc()));
-}
-
-/// Compute the nullability of a conditional expression.
-static QualType computeConditionalNullability(QualType ResTy, bool IsBin,
-                                              QualType LHSTy, QualType RHSTy,
-                                              ASTContext &Ctx) {
-  if (!ResTy->isAnyPointerType())
-    return ResTy;
-
-  auto GetNullability = [&Ctx](QualType Ty) {
-    Optional<NullabilityKind> Kind = Ty->getNullability(Ctx);
-    if (Kind)
-      return *Kind;
-    return NullabilityKind::Unspecified;
-  };
-
-  auto LHSKind = GetNullability(LHSTy), RHSKind = GetNullability(RHSTy);
-  NullabilityKind MergedKind;
-
-  // Compute nullability of a binary conditional expression.
-  if (IsBin) {
-    if (LHSKind == NullabilityKind::NonNull)
-      MergedKind = NullabilityKind::NonNull;
-    else
-      MergedKind = RHSKind;
-  // Compute nullability of a normal conditional expression.
-  } else {
-    if (LHSKind == NullabilityKind::Nullable ||
-        RHSKind == NullabilityKind::Nullable)
-      MergedKind = NullabilityKind::Nullable;
-    else if (LHSKind == NullabilityKind::NonNull)
-      MergedKind = RHSKind;
-    else if (RHSKind == NullabilityKind::NonNull)
-      MergedKind = LHSKind;
-    else
-      MergedKind = NullabilityKind::Unspecified;
-  }
-
-  // Return if ResTy already has the correct nullability.
-  if (GetNullability(ResTy) == MergedKind)
-    return ResTy;
-
-  // Strip all nullability from ResTy.
-  while (ResTy->getNullability(Ctx))
-    ResTy = ResTy.getSingleStepDesugaredType(Ctx);
-
-  // Create a new AttributedType with the new nullability kind.
-  auto NewAttr = AttributedType::getNullabilityAttrKind(MergedKind);
-  return Ctx.getAttributedType(NewAttr, ResTy, ResTy);
-}
-
-/// ActOnConditionalOp - Parse a ?: operation.  Note that 'LHS' may be null
-/// in the case of a the GNU conditional expr extension.
-ExprResult Sema::ActOnConditionalOp(SourceLocation QuestionLoc,
-                                    SourceLocation ColonLoc,
-                                    Expr *CondExpr, Expr *LHSExpr,
-                                    Expr *RHSExpr) {
-  if (!getLangOpts().CPlusPlus) {
-    // C cannot handle TypoExpr nodes in the condition because it
-    // doesn't handle dependent types properly, so make sure any TypoExprs have
-    // been dealt with before checking the operands.
-    ExprResult CondResult = CorrectDelayedTyposInExpr(CondExpr);
-    ExprResult LHSResult = CorrectDelayedTyposInExpr(LHSExpr);
-    ExprResult RHSResult = CorrectDelayedTyposInExpr(RHSExpr);
-
-    if (!CondResult.isUsable())
-      return ExprError();
-
-    if (LHSExpr) {
-      if (!LHSResult.isUsable())
-        return ExprError();
-    }
-
-    if (!RHSResult.isUsable())
-      return ExprError();
-
-    CondExpr = CondResult.get();
-    LHSExpr = LHSResult.get();
-    RHSExpr = RHSResult.get();
-  }
-
-  // If this is the gnu "x ?: y" extension, analyze the types as though the LHS
-  // was the condition.
-  OpaqueValueExpr *opaqueValue = nullptr;
-  Expr *commonExpr = nullptr;
-  if (!LHSExpr) {
-    commonExpr = CondExpr;
-    // Lower out placeholder types first.  This is important so that we don't
-    // try to capture a placeholder. This happens in few cases in C++; such
-    // as Objective-C++'s dictionary subscripting syntax.
-    if (commonExpr->hasPlaceholderType()) {
-      ExprResult result = CheckPlaceholderExpr(commonExpr);
-      if (!result.isUsable()) return ExprError();
-      commonExpr = result.get();
-    }
-    // We usually want to apply unary conversions *before* saving, except
-    // in the special case of a C++ l-value conditional.
-    if (!(getLangOpts().CPlusPlus
-          && !commonExpr->isTypeDependent()
-          && commonExpr->getValueKind() == RHSExpr->getValueKind()
-          && commonExpr->isGLValue()
-          && commonExpr->isOrdinaryOrBitFieldObject()
-          && RHSExpr->isOrdinaryOrBitFieldObject()
-          && Context.hasSameType(commonExpr->getType(), RHSExpr->getType()))) {
-      ExprResult commonRes = UsualUnaryConversions(commonExpr);
-      if (commonRes.isInvalid())
-        return ExprError();
-      commonExpr = commonRes.get();
-    }
-
-    // If the common expression is a class or array prvalue, materialize it
-    // so that we can safely refer to it multiple times.
-    if (commonExpr->isRValue() && (commonExpr->getType()->isRecordType() ||
-                                   commonExpr->getType()->isArrayType())) {
-      ExprResult MatExpr = TemporaryMaterializationConversion(commonExpr);
-      if (MatExpr.isInvalid())
-        return ExprError();
-      commonExpr = MatExpr.get();
-    }
-
-    opaqueValue = new (Context) OpaqueValueExpr(commonExpr->getExprLoc(),
-                                                commonExpr->getType(),
-                                                commonExpr->getValueKind(),
-                                                commonExpr->getObjectKind(),
-                                                commonExpr);
-    LHSExpr = CondExpr = opaqueValue;
-  }
-
-  QualType LHSTy = LHSExpr->getType(), RHSTy = RHSExpr->getType();
-  ExprValueKind VK = VK_RValue;
-  ExprObjectKind OK = OK_Ordinary;
-  ExprResult Cond = CondExpr, LHS = LHSExpr, RHS = RHSExpr;
-  QualType result = CheckConditionalOperands(Cond, LHS, RHS,
-                                             VK, OK, QuestionLoc);
-  if (result.isNull() || Cond.isInvalid() || LHS.isInvalid() ||
-      RHS.isInvalid())
-    return ExprError();
-
-  DiagnoseConditionalPrecedence(*this, QuestionLoc, Cond.get(), LHS.get(),
-                                RHS.get());
-
-  CheckBoolLikeConversion(Cond.get(), QuestionLoc);
-
-  result = computeConditionalNullability(result, commonExpr, LHSTy, RHSTy,
-                                         Context);
-
-  if (!commonExpr)
-    return new (Context)
-        ConditionalOperator(Cond.get(), QuestionLoc, LHS.get(), ColonLoc,
-                            RHS.get(), result, VK, OK);
-
-  return new (Context) BinaryConditionalOperator(
-      commonExpr, opaqueValue, Cond.get(), LHS.get(), RHS.get(), QuestionLoc,
-      ColonLoc, result, VK, OK);
-}
-
-// checkPointerTypesForAssignment - This is a very tricky routine (despite
-// being closely modeled after the C99 spec:-). The odd characteristic of this
-// routine is it effectively iqnores the qualifiers on the top level pointee.
-// This circumvents the usual type rules specified in 6.2.7p1 & 6.7.5.[1-3].
-// FIXME: add a couple examples in this comment.
-static Sema::AssignConvertType
-checkPointerTypesForAssignment(Sema &S, QualType LHSType, QualType RHSType) {
-  assert(LHSType.isCanonical() && "LHS not canonicalized!");
-  assert(RHSType.isCanonical() && "RHS not canonicalized!");
-
-  // get the "pointed to" type (ignoring qualifiers at the top level)
-  const Type *lhptee, *rhptee;
-  Qualifiers lhq, rhq;
-  std::tie(lhptee, lhq) =
-      cast<PointerType>(LHSType)->getPointeeType().split().asPair();
-  std::tie(rhptee, rhq) =
-      cast<PointerType>(RHSType)->getPointeeType().split().asPair();
-
-  Sema::AssignConvertType ConvTy = Sema::Compatible;
-
-  // C99 6.5.16.1p1: This following citation is common to constraints
-  // 3 & 4 (below). ...and the type *pointed to* by the left has all the
-  // qualifiers of the type *pointed to* by the right;
-
-  // As a special case, 'non-__weak A *' -> 'non-__weak const *' is okay.
-  if (lhq.getObjCLifetime() != rhq.getObjCLifetime() &&
-      lhq.compatiblyIncludesObjCLifetime(rhq)) {
-    // Ignore lifetime for further calculation.
-    lhq.removeObjCLifetime();
-    rhq.removeObjCLifetime();
-  }
-
-  if (!lhq.compatiblyIncludes(rhq)) {
-    // Treat address-space mismatches as fatal.  TODO: address subspaces
-    if (!lhq.isAddressSpaceSupersetOf(rhq))
-      ConvTy = Sema::IncompatiblePointerDiscardsQualifiers;
-
-    // It's okay to add or remove GC or lifetime qualifiers when converting to
-    // and from void*.
-    else if (lhq.withoutObjCGCAttr().withoutObjCLifetime()
-                        .compatiblyIncludes(
-                                rhq.withoutObjCGCAttr().withoutObjCLifetime())
-             && (lhptee->isVoidType() || rhptee->isVoidType()))
-      ; // keep old
-
-    // Treat lifetime mismatches as fatal.
-    else if (lhq.getObjCLifetime() != rhq.getObjCLifetime())
-      ConvTy = Sema::IncompatiblePointerDiscardsQualifiers;
-
-    // For GCC/MS compatibility, other qualifier mismatches are treated
-    // as still compatible in C.
-    else ConvTy = Sema::CompatiblePointerDiscardsQualifiers;
-  }
-
-  // C99 6.5.16.1p1 (constraint 4): If one operand is a pointer to an object or
-  // incomplete type and the other is a pointer to a qualified or unqualified
-  // version of void...
-  if (lhptee->isVoidType()) {
-    if (rhptee->isIncompleteOrObjectType())
-      return ConvTy;
-
-    // As an extension, we allow cast to/from void* to function pointer.
-    assert(rhptee->isFunctionType());
-    return Sema::FunctionVoidPointer;
-  }
-
-  if (rhptee->isVoidType()) {
-    if (lhptee->isIncompleteOrObjectType())
-      return ConvTy;
-
-    // As an extension, we allow cast to/from void* to function pointer.
-    assert(lhptee->isFunctionType());
-    return Sema::FunctionVoidPointer;
-  }
-
-  // C99 6.5.16.1p1 (constraint 3): both operands are pointers to qualified or
-  // unqualified versions of compatible types, ...
-  QualType ltrans = QualType(lhptee, 0), rtrans = QualType(rhptee, 0);
-  if (!S.Context.typesAreCompatible(ltrans, rtrans)) {
-    // Check if the pointee types are compatible ignoring the sign.
-    // We explicitly check for char so that we catch "char" vs
-    // "unsigned char" on systems where "char" is unsigned.
-    if (lhptee->isCharType())
-      ltrans = S.Context.UnsignedCharTy;
-    else if (lhptee->hasSignedIntegerRepresentation())
-      ltrans = S.Context.getCorrespondingUnsignedType(ltrans);
-
-    if (rhptee->isCharType())
-      rtrans = S.Context.UnsignedCharTy;
-    else if (rhptee->hasSignedIntegerRepresentation())
-      rtrans = S.Context.getCorrespondingUnsignedType(rtrans);
-
-    if (ltrans == rtrans) {
-      // Types are compatible ignoring the sign. Qualifier incompatibility
-      // takes priority over sign incompatibility because the sign
-      // warning can be disabled.
-      if (ConvTy != Sema::Compatible)
-        return ConvTy;
-
-      return Sema::IncompatiblePointerSign;
-    }
-
-    // If we are a multi-level pointer, it's possible that our issue is simply
-    // one of qualification - e.g. char ** -> const char ** is not allowed. If
-    // the eventual target type is the same and the pointers have the same
-    // level of indirection, this must be the issue.
-    if (isa<PointerType>(lhptee) && isa<PointerType>(rhptee)) {
-      do {
-        lhptee = cast<PointerType>(lhptee)->getPointeeType().getTypePtr();
-        rhptee = cast<PointerType>(rhptee)->getPointeeType().getTypePtr();
-      } while (isa<PointerType>(lhptee) && isa<PointerType>(rhptee));
-
-      if (lhptee == rhptee)
-        return Sema::IncompatibleNestedPointerQualifiers;
-    }
-
-    // General pointer incompatibility takes priority over qualifiers.
-    return Sema::IncompatiblePointer;
-  }
-  if (!S.getLangOpts().CPlusPlus &&
-      S.IsFunctionConversion(ltrans, rtrans, ltrans))
-    return Sema::IncompatiblePointer;
-  return ConvTy;
-}
-
-/// checkBlockPointerTypesForAssignment - This routine determines whether two
-/// block pointer types are compatible or whether a block and normal pointer
-/// are compatible. It is more restrict than comparing two function pointer
-// types.
-static Sema::AssignConvertType
-checkBlockPointerTypesForAssignment(Sema &S, QualType LHSType,
-                                    QualType RHSType) {
-  assert(LHSType.isCanonical() && "LHS not canonicalized!");
-  assert(RHSType.isCanonical() && "RHS not canonicalized!");
-
-  QualType lhptee, rhptee;
-
-  // get the "pointed to" type (ignoring qualifiers at the top level)
-  lhptee = cast<BlockPointerType>(LHSType)->getPointeeType();
-  rhptee = cast<BlockPointerType>(RHSType)->getPointeeType();
-
-  // In C++, the types have to match exactly.
-  if (S.getLangOpts().CPlusPlus)
-    return Sema::IncompatibleBlockPointer;
-
-  Sema::AssignConvertType ConvTy = Sema::Compatible;
-
-  // For blocks we enforce that qualifiers are identical.
-  Qualifiers LQuals = lhptee.getLocalQualifiers();
-  Qualifiers RQuals = rhptee.getLocalQualifiers();
-  if (S.getLangOpts().OpenCL) {
-    LQuals.removeAddressSpace();
-    RQuals.removeAddressSpace();
-  }
-  if (LQuals != RQuals)
-    ConvTy = Sema::CompatiblePointerDiscardsQualifiers;
-
-  // FIXME: OpenCL doesn't define the exact compile time semantics for a block
-  // assignment.
-  // The current behavior is similar to C++ lambdas. A block might be
-  // assigned to a variable iff its return type and parameters are compatible
-  // (C99 6.2.7) with the corresponding return type and parameters of the LHS of
-  // an assignment. Presumably it should behave in way that a function pointer
-  // assignment does in C, so for each parameter and return type:
-  //  * CVR and address space of LHS should be a superset of CVR and address
-  //  space of RHS.
-  //  * unqualified types should be compatible.
-  if (S.getLangOpts().OpenCL) {
-    if (!S.Context.typesAreBlockPointerCompatible(
-            S.Context.getQualifiedType(LHSType.getUnqualifiedType(), LQuals),
-            S.Context.getQualifiedType(RHSType.getUnqualifiedType(), RQuals)))
-      return Sema::IncompatibleBlockPointer;
-  } else if (!S.Context.typesAreBlockPointerCompatible(LHSType, RHSType))
-    return Sema::IncompatibleBlockPointer;
-
-  return ConvTy;
-}
-
-/// checkObjCPointerTypesForAssignment - Compares two objective-c pointer types
-/// for assignment compatibility.
-static Sema::AssignConvertType
-checkObjCPointerTypesForAssignment(Sema &S, QualType LHSType,
-                                   QualType RHSType) {
-  assert(LHSType.isCanonical() && "LHS was not canonicalized!");
-  assert(RHSType.isCanonical() && "RHS was not canonicalized!");
-
-  if (LHSType->isObjCBuiltinType()) {
-    // Class is not compatible with ObjC object pointers.
-    if (LHSType->isObjCClassType() && !RHSType->isObjCBuiltinType() &&
-        !RHSType->isObjCQualifiedClassType())
-      return Sema::IncompatiblePointer;
-    return Sema::Compatible;
-  }
-  if (RHSType->isObjCBuiltinType()) {
-    if (RHSType->isObjCClassType() && !LHSType->isObjCBuiltinType() &&
-        !LHSType->isObjCQualifiedClassType())
-      return Sema::IncompatiblePointer;
-    return Sema::Compatible;
-  }
-  QualType lhptee = LHSType->getAs<ObjCObjectPointerType>()->getPointeeType();
-  QualType rhptee = RHSType->getAs<ObjCObjectPointerType>()->getPointeeType();
-
-  if (!lhptee.isAtLeastAsQualifiedAs(rhptee) &&
-      // make an exception for id<P>
-      !LHSType->isObjCQualifiedIdType())
-    return Sema::CompatiblePointerDiscardsQualifiers;
-
-  if (S.Context.typesAreCompatible(LHSType, RHSType))
-    return Sema::Compatible;
-  if (LHSType->isObjCQualifiedIdType() || RHSType->isObjCQualifiedIdType())
-    return Sema::IncompatibleObjCQualifiedId;
-  return Sema::IncompatiblePointer;
-}
-
-Sema::AssignConvertType
-Sema::CheckAssignmentConstraints(SourceLocation Loc,
-                                 QualType LHSType, QualType RHSType) {
-  // Fake up an opaque expression.  We don't actually care about what
-  // cast operations are required, so if CheckAssignmentConstraints
-  // adds casts to this they'll be wasted, but fortunately that doesn't
-  // usually happen on valid code.
-  OpaqueValueExpr RHSExpr(Loc, RHSType, VK_RValue);
-  ExprResult RHSPtr = &RHSExpr;
-  CastKind K;
-
-  return CheckAssignmentConstraints(LHSType, RHSPtr, K, /*ConvertRHS=*/false);
-}
-
-/// This helper function returns true if QT is a vector type that has element
-/// type ElementType.
-static bool isVector(QualType QT, QualType ElementType) {
-  if (const VectorType *VT = QT->getAs<VectorType>())
-    return VT->getElementType() == ElementType;
-  return false;
-}
-
-/// CheckAssignmentConstraints (C99 6.5.16) - This routine currently
-/// has code to accommodate several GCC extensions when type checking
-/// pointers. Here are some objectionable examples that GCC considers warnings:
-///
-///  int a, *pint;
-///  short *pshort;
-///  struct foo *pfoo;
-///
-///  pint = pshort; // warning: assignment from incompatible pointer type
-///  a = pint; // warning: assignment makes integer from pointer without a cast
-///  pint = a; // warning: assignment makes pointer from integer without a cast
-///  pint = pfoo; // warning: assignment from incompatible pointer type
-///
-/// As a result, the code for dealing with pointers is more complex than the
-/// C99 spec dictates.
-///
-/// Sets 'Kind' for any result kind except Incompatible.
-Sema::AssignConvertType
-Sema::CheckAssignmentConstraints(QualType LHSType, ExprResult &RHS,
-                                 CastKind &Kind, bool ConvertRHS) {
-  QualType RHSType = RHS.get()->getType();
-  QualType OrigLHSType = LHSType;
-
-  // Get canonical types.  We're not formatting these types, just comparing
-  // them.
-  LHSType = Context.getCanonicalType(LHSType).getUnqualifiedType();
-  RHSType = Context.getCanonicalType(RHSType).getUnqualifiedType();
-
-  // Common case: no conversion required.
-  if (LHSType == RHSType) {
-    Kind = CK_NoOp;
-    return Compatible;
-  }
-
-  // If we have an atomic type, try a non-atomic assignment, then just add an
-  // atomic qualification step.
-  if (const AtomicType *AtomicTy = dyn_cast<AtomicType>(LHSType)) {
-    Sema::AssignConvertType result =
-      CheckAssignmentConstraints(AtomicTy->getValueType(), RHS, Kind);
-    if (result != Compatible)
-      return result;
-    if (Kind != CK_NoOp && ConvertRHS)
-      RHS = ImpCastExprToType(RHS.get(), AtomicTy->getValueType(), Kind);
-    Kind = CK_NonAtomicToAtomic;
-    return Compatible;
-  }
-
-  // If the left-hand side is a reference type, then we are in a
-  // (rare!) case where we've allowed the use of references in C,
-  // e.g., as a parameter type in a built-in function. In this case,
-  // just make sure that the type referenced is compatible with the
-  // right-hand side type. The caller is responsible for adjusting
-  // LHSType so that the resulting expression does not have reference
-  // type.
-  if (const ReferenceType *LHSTypeRef = LHSType->getAs<ReferenceType>()) {
-    if (Context.typesAreCompatible(LHSTypeRef->getPointeeType(), RHSType)) {
-      Kind = CK_LValueBitCast;
-      return Compatible;
-    }
-    return Incompatible;
-  }
-
-  // Allow scalar to ExtVector assignments, and assignments of an ExtVector type
-  // to the same ExtVector type.
-  if (LHSType->isExtVectorType()) {
-    if (RHSType->isExtVectorType())
-      return Incompatible;
-    if (RHSType->isArithmeticType()) {
-      // CK_VectorSplat does T -> vector T, so first cast to the element type.
-      if (ConvertRHS)
-        RHS = prepareVectorSplat(LHSType, RHS.get());
-      Kind = CK_VectorSplat;
-      return Compatible;
-    }
-  }
-
-  // Conversions to or from vector type.
-  if (LHSType->isVectorType() || RHSType->isVectorType()) {
-    if (LHSType->isVectorType() && RHSType->isVectorType()) {
-      // Allow assignments of an AltiVec vector type to an equivalent GCC
-      // vector type and vice versa
-      if (Context.areCompatibleVectorTypes(LHSType, RHSType)) {
-        Kind = CK_BitCast;
-        return Compatible;
-      }
-
-      // If we are allowing lax vector conversions, and LHS and RHS are both
-      // vectors, the total size only needs to be the same. This is a bitcast;
-      // no bits are changed but the result type is different.
-      if (isLaxVectorConversion(RHSType, LHSType)) {
-        Kind = CK_BitCast;
-        return IncompatibleVectors;
-      }
-    }
-
-    // When the RHS comes from another lax conversion (e.g. binops between
-    // scalars and vectors) the result is canonicalized as a vector. When the
-    // LHS is also a vector, the lax is allowed by the condition above. Handle
-    // the case where LHS is a scalar.
-    if (LHSType->isScalarType()) {
-      const VectorType *VecType = RHSType->getAs<VectorType>();
-      if (VecType && VecType->getNumElements() == 1 &&
-          isLaxVectorConversion(RHSType, LHSType)) {
-        ExprResult *VecExpr = &RHS;
-        *VecExpr = ImpCastExprToType(VecExpr->get(), LHSType, CK_BitCast);
-        Kind = CK_BitCast;
-        return Compatible;
-      }
-    }
-
-    return Incompatible;
-  }
-
-  // Diagnose attempts to convert between __float128 and long double where
-  // such conversions currently can't be handled.
-  if (unsupportedTypeConversion(*this, LHSType, RHSType))
-    return Incompatible;
-
-  // Disallow assigning a _Complex to a real type in C++ mode since it simply
-  // discards the imaginary part.
-  if (getLangOpts().CPlusPlus && RHSType->getAs<ComplexType>() &&
-      !LHSType->getAs<ComplexType>())
-    return Incompatible;
-
-  // Arithmetic conversions.
-  if (LHSType->isArithmeticType() && RHSType->isArithmeticType() &&
-      !(getLangOpts().CPlusPlus && LHSType->isEnumeralType())) {
-    if (ConvertRHS)
-      Kind = PrepareScalarCast(RHS, LHSType);
-    return Compatible;
-  }
-
-  // Conversions to normal pointers.
-  if (const PointerType *LHSPointer = dyn_cast<PointerType>(LHSType)) {
-    // U* -> T*
-    if (isa<PointerType>(RHSType)) {
-      LangAS AddrSpaceL = LHSPointer->getPointeeType().getAddressSpace();
-      LangAS AddrSpaceR = RHSType->getPointeeType().getAddressSpace();
-      if (AddrSpaceL != AddrSpaceR)
-        Kind = CK_AddressSpaceConversion;
-      else if (Context.hasCvrSimilarType(RHSType, LHSType))
-        Kind = CK_NoOp;
-      else
-        Kind = CK_BitCast;
-      return checkPointerTypesForAssignment(*this, LHSType, RHSType);
-    }
-
-    // int -> T*
-    if (RHSType->isIntegerType()) {
-      Kind = CK_IntegralToPointer; // FIXME: null?
-      return IntToPointer;
-    }
-
-    // C pointers are not compatible with ObjC object pointers,
-    // with two exceptions:
-    if (isa<ObjCObjectPointerType>(RHSType)) {
-      //  - conversions to void*
-      if (LHSPointer->getPointeeType()->isVoidType()) {
-        Kind = CK_BitCast;
-        return Compatible;
-      }
-
-      //  - conversions from 'Class' to the redefinition type
-      if (RHSType->isObjCClassType() &&
-          Context.hasSameType(LHSType,
-                              Context.getObjCClassRedefinitionType())) {
-        Kind = CK_BitCast;
-        return Compatible;
-      }
-
-      Kind = CK_BitCast;
-      return IncompatiblePointer;
-    }
-
-    // U^ -> void*
-    if (RHSType->getAs<BlockPointerType>()) {
-      if (LHSPointer->getPointeeType()->isVoidType()) {
-        LangAS AddrSpaceL = LHSPointer->getPointeeType().getAddressSpace();
-        LangAS AddrSpaceR = RHSType->getAs<BlockPointerType>()
-                                ->getPointeeType()
-                                .getAddressSpace();
-        Kind =
-            AddrSpaceL != AddrSpaceR ? CK_AddressSpaceConversion : CK_BitCast;
-        return Compatible;
-      }
-    }
-
-    return Incompatible;
-  }
-
-  // Conversions to block pointers.
-  if (isa<BlockPointerType>(LHSType)) {
-    // U^ -> T^
-    if (RHSType->isBlockPointerType()) {
-      LangAS AddrSpaceL = LHSType->getAs<BlockPointerType>()
-                              ->getPointeeType()
-                              .getAddressSpace();
-      LangAS AddrSpaceR = RHSType->getAs<BlockPointerType>()
-                              ->getPointeeType()
-                              .getAddressSpace();
-      Kind = AddrSpaceL != AddrSpaceR ? CK_AddressSpaceConversion : CK_BitCast;
-      return checkBlockPointerTypesForAssignment(*this, LHSType, RHSType);
-    }
-
-    // int or null -> T^
-    if (RHSType->isIntegerType()) {
-      Kind = CK_IntegralToPointer; // FIXME: null
-      return IntToBlockPointer;
-    }
-
-    // id -> T^
-    if (getLangOpts().ObjC && RHSType->isObjCIdType()) {
-      Kind = CK_AnyPointerToBlockPointerCast;
-      return Compatible;
-    }
-
-    // void* -> T^
-    if (const PointerType *RHSPT = RHSType->getAs<PointerType>())
-      if (RHSPT->getPointeeType()->isVoidType()) {
-        Kind = CK_AnyPointerToBlockPointerCast;
-        return Compatible;
-      }
-
-    return Incompatible;
-  }
-
-  // Conversions to Objective-C pointers.
-  if (isa<ObjCObjectPointerType>(LHSType)) {
-    // A* -> B*
-    if (RHSType->isObjCObjectPointerType()) {
-      Kind = CK_BitCast;
-      Sema::AssignConvertType result =
-        checkObjCPointerTypesForAssignment(*this, LHSType, RHSType);
-      if (getLangOpts().allowsNonTrivialObjCLifetimeQualifiers() &&
-          result == Compatible &&
-          !CheckObjCARCUnavailableWeakConversion(OrigLHSType, RHSType))
-        result = IncompatibleObjCWeakRef;
-      return result;
-    }
-
-    // int or null -> A*
-    if (RHSType->isIntegerType()) {
-      Kind = CK_IntegralToPointer; // FIXME: null
-      return IntToPointer;
-    }
-
-    // In general, C pointers are not compatible with ObjC object pointers,
-    // with two exceptions:
-    if (isa<PointerType>(RHSType)) {
-      Kind = CK_CPointerToObjCPointerCast;
-
-      //  - conversions from 'void*'
-      if (RHSType->isVoidPointerType()) {
-        return Compatible;
-      }
-
-      //  - conversions to 'Class' from its redefinition type
-      if (LHSType->isObjCClassType() &&
-          Context.hasSameType(RHSType,
-                              Context.getObjCClassRedefinitionType())) {
-        return Compatible;
-      }
-
-      return IncompatiblePointer;
-    }
-
-    // Only under strict condition T^ is compatible with an Objective-C pointer.
-    if (RHSType->isBlockPointerType() &&
-        LHSType->isBlockCompatibleObjCPointerType(Context)) {
-      if (ConvertRHS)
-        maybeExtendBlockObject(RHS);
-      Kind = CK_BlockPointerToObjCPointerCast;
-      return Compatible;
-    }
-
-    return Incompatible;
-  }
-
-  // Conversions from pointers that are not covered by the above.
-  if (isa<PointerType>(RHSType)) {
-    // T* -> _Bool
-    if (LHSType == Context.BoolTy) {
-      Kind = CK_PointerToBoolean;
-      return Compatible;
-    }
-
-    // T* -> int
-    if (LHSType->isIntegerType()) {
-      Kind = CK_PointerToIntegral;
-      return PointerToInt;
-    }
-
-    return Incompatible;
-  }
-
-  // Conversions from Objective-C pointers that are not covered by the above.
-  if (isa<ObjCObjectPointerType>(RHSType)) {
-    // T* -> _Bool
-    if (LHSType == Context.BoolTy) {
-      Kind = CK_PointerToBoolean;
-      return Compatible;
-    }
-
-    // T* -> int
-    if (LHSType->isIntegerType()) {
-      Kind = CK_PointerToIntegral;
-      return PointerToInt;
-    }
-
-    return Incompatible;
-  }
-
-  // struct A -> struct B
-  if (isa<TagType>(LHSType) && isa<TagType>(RHSType)) {
-    if (Context.typesAreCompatible(LHSType, RHSType)) {
-      Kind = CK_NoOp;
-      return Compatible;
-    }
-  }
-
-  if (LHSType->isSamplerT() && RHSType->isIntegerType()) {
-    Kind = CK_IntToOCLSampler;
-    return Compatible;
-  }
-
-  return Incompatible;
-}
-
-/// Constructs a transparent union from an expression that is
-/// used to initialize the transparent union.
-static void ConstructTransparentUnion(Sema &S, ASTContext &C,
-                                      ExprResult &EResult, QualType UnionType,
-                                      FieldDecl *Field) {
-  // Build an initializer list that designates the appropriate member
-  // of the transparent union.
-  Expr *E = EResult.get();
-  InitListExpr *Initializer = new (C) InitListExpr(C, SourceLocation(),
-                                                   E, SourceLocation());
-  Initializer->setType(UnionType);
-  Initializer->setInitializedFieldInUnion(Field);
-
-  // Build a compound literal constructing a value of the transparent
-  // union type from this initializer list.
-  TypeSourceInfo *unionTInfo = C.getTrivialTypeSourceInfo(UnionType);
-  EResult = new (C) CompoundLiteralExpr(SourceLocation(), unionTInfo, UnionType,
-                                        VK_RValue, Initializer, false);
-}
-
-Sema::AssignConvertType
-Sema::CheckTransparentUnionArgumentConstraints(QualType ArgType,
-                                               ExprResult &RHS) {
-  QualType RHSType = RHS.get()->getType();
-
-  // If the ArgType is a Union type, we want to handle a potential
-  // transparent_union GCC extension.
-  const RecordType *UT = ArgType->getAsUnionType();
-  if (!UT || !UT->getDecl()->hasAttr<TransparentUnionAttr>())
-    return Incompatible;
-
-  // The field to initialize within the transparent union.
-  RecordDecl *UD = UT->getDecl();
-  FieldDecl *InitField = nullptr;
-  // It's compatible if the expression matches any of the fields.
-  for (auto *it : UD->fields()) {
-    if (it->getType()->isPointerType()) {
-      // If the transparent union contains a pointer type, we allow:
-      // 1) void pointer
-      // 2) null pointer constant
-      if (RHSType->isPointerType())
-        if (RHSType->castAs<PointerType>()->getPointeeType()->isVoidType()) {
-          RHS = ImpCastExprToType(RHS.get(), it->getType(), CK_BitCast);
-          InitField = it;
-          break;
-        }
-
-      if (RHS.get()->isNullPointerConstant(Context,
-                                           Expr::NPC_ValueDependentIsNull)) {
-        RHS = ImpCastExprToType(RHS.get(), it->getType(),
-                                CK_NullToPointer);
-        InitField = it;
-        break;
-      }
-    }
-
-    CastKind Kind;
-    if (CheckAssignmentConstraints(it->getType(), RHS, Kind)
-          == Compatible) {
-      RHS = ImpCastExprToType(RHS.get(), it->getType(), Kind);
-      InitField = it;
-      break;
-    }
-  }
-
-  if (!InitField)
-    return Incompatible;
-
-  ConstructTransparentUnion(*this, Context, RHS, ArgType, InitField);
-  return Compatible;
-}
-
-Sema::AssignConvertType
-Sema::CheckSingleAssignmentConstraints(QualType LHSType, ExprResult &CallerRHS,
-                                       bool Diagnose,
-                                       bool DiagnoseCFAudited,
-                                       bool ConvertRHS) {
-  // We need to be able to tell the caller whether we diagnosed a problem, if
-  // they ask us to issue diagnostics.
-  assert((ConvertRHS || !Diagnose) && "can't indicate whether we diagnosed");
-
-  // If ConvertRHS is false, we want to leave the caller's RHS untouched. Sadly,
-  // we can't avoid *all* modifications at the moment, so we need some somewhere
-  // to put the updated value.
-  ExprResult LocalRHS = CallerRHS;
-  ExprResult &RHS = ConvertRHS ? CallerRHS : LocalRHS;
-
-  if (const auto *LHSPtrType = LHSType->getAs<PointerType>()) {
-    if (const auto *RHSPtrType = RHS.get()->getType()->getAs<PointerType>()) {
-      if (RHSPtrType->getPointeeType()->hasAttr(attr::NoDeref) &&
-          !LHSPtrType->getPointeeType()->hasAttr(attr::NoDeref)) {
-        Diag(RHS.get()->getExprLoc(),
-             diag::warn_noderef_to_dereferenceable_pointer)
-            << RHS.get()->getSourceRange();
-      }
-    }
-  }
-
-  if (getLangOpts().CPlusPlus) {
-    if (!LHSType->isRecordType() && !LHSType->isAtomicType()) {
-      // C++ 5.17p3: If the left operand is not of class type, the
-      // expression is implicitly converted (C++ 4) to the
-      // cv-unqualified type of the left operand.
-      QualType RHSType = RHS.get()->getType();
-      if (Diagnose) {
-        RHS = PerformImplicitConversion(RHS.get(), LHSType.getUnqualifiedType(),
-                                        AA_Assigning);
-      } else {
-        ImplicitConversionSequence ICS =
-            TryImplicitConversion(RHS.get(), LHSType.getUnqualifiedType(),
-                                  /*SuppressUserConversions=*/false,
-                                  /*AllowExplicit=*/false,
-                                  /*InOverloadResolution=*/false,
-                                  /*CStyle=*/false,
-                                  /*AllowObjCWritebackConversion=*/false);
-        if (ICS.isFailure())
-          return Incompatible;
-        RHS = PerformImplicitConversion(RHS.get(), LHSType.getUnqualifiedType(),
-                                        ICS, AA_Assigning);
-      }
-      if (RHS.isInvalid())
-        return Incompatible;
-      Sema::AssignConvertType result = Compatible;
-      if (getLangOpts().allowsNonTrivialObjCLifetimeQualifiers() &&
-          !CheckObjCARCUnavailableWeakConversion(LHSType, RHSType))
-        result = IncompatibleObjCWeakRef;
-      return result;
-    }
-
-    // FIXME: Currently, we fall through and treat C++ classes like C
-    // structures.
-    // FIXME: We also fall through for atomics; not sure what should
-    // happen there, though.
-  } else if (RHS.get()->getType() == Context.OverloadTy) {
-    // As a set of extensions to C, we support overloading on functions. These
-    // functions need to be resolved here.
-    DeclAccessPair DAP;
-    if (FunctionDecl *FD = ResolveAddressOfOverloadedFunction(
-            RHS.get(), LHSType, /*Complain=*/false, DAP))
-      RHS = FixOverloadedFunctionReference(RHS.get(), DAP, FD);
-    else
-      return Incompatible;
-  }
-
-  // C99 6.5.16.1p1: the left operand is a pointer and the right is
-  // a null pointer constant.
-  if ((LHSType->isPointerType() || LHSType->isObjCObjectPointerType() ||
-       LHSType->isBlockPointerType()) &&
-      RHS.get()->isNullPointerConstant(Context,
-                                       Expr::NPC_ValueDependentIsNull)) {
-    if (Diagnose || ConvertRHS) {
-      CastKind Kind;
-      CXXCastPath Path;
-      CheckPointerConversion(RHS.get(), LHSType, Kind, Path,
-                             /*IgnoreBaseAccess=*/false, Diagnose);
-      if (ConvertRHS)
-        RHS = ImpCastExprToType(RHS.get(), LHSType, Kind, VK_RValue, &Path);
-    }
-    return Compatible;
-  }
-
-  // OpenCL queue_t type assignment.
-  if (LHSType->isQueueT() && RHS.get()->isNullPointerConstant(
-                                 Context, Expr::NPC_ValueDependentIsNull)) {
-    RHS = ImpCastExprToType(RHS.get(), LHSType, CK_NullToPointer);
-    return Compatible;
-  }
-
-  // This check seems unnatural, however it is necessary to ensure the proper
-  // conversion of functions/arrays. If the conversion were done for all
-  // DeclExpr's (created by ActOnIdExpression), it would mess up the unary
-  // expressions that suppress this implicit conversion (&, sizeof).
-  //
-  // Suppress this for references: C++ 8.5.3p5.
-  if (!LHSType->isReferenceType()) {
-    // FIXME: We potentially allocate here even if ConvertRHS is false.
-    RHS = DefaultFunctionArrayLvalueConversion(RHS.get(), Diagnose);
-    if (RHS.isInvalid())
-      return Incompatible;
-  }
-  CastKind Kind;
-  Sema::AssignConvertType result =
-    CheckAssignmentConstraints(LHSType, RHS, Kind, ConvertRHS);
-
-  // C99 6.5.16.1p2: The value of the right operand is converted to the
-  // type of the assignment expression.
-  // CheckAssignmentConstraints allows the left-hand side to be a reference,
-  // so that we can use references in built-in functions even in C.
-  // The getNonReferenceType() call makes sure that the resulting expression
-  // does not have reference type.
-  if (result != Incompatible && RHS.get()->getType() != LHSType) {
-    QualType Ty = LHSType.getNonLValueExprType(Context);
-    Expr *E = RHS.get();
-
-    // Check for various Objective-C errors. If we are not reporting
-    // diagnostics and just checking for errors, e.g., during overload
-    // resolution, return Incompatible to indicate the failure.
-    if (getLangOpts().allowsNonTrivialObjCLifetimeQualifiers() &&
-        CheckObjCConversion(SourceRange(), Ty, E, CCK_ImplicitConversion,
-                            Diagnose, DiagnoseCFAudited) != ACR_okay) {
-      if (!Diagnose)
-        return Incompatible;
-    }
-    if (getLangOpts().ObjC &&
-        (CheckObjCBridgeRelatedConversions(E->getBeginLoc(), LHSType,
-                                           E->getType(), E, Diagnose) ||
-         ConversionToObjCStringLiteralCheck(LHSType, E, Diagnose))) {
-      if (!Diagnose)
-        return Incompatible;
-      // Replace the expression with a corrected version and continue so we
-      // can find further errors.
-      RHS = E;
-      return Compatible;
-    }
-
-    if (ConvertRHS)
-      RHS = ImpCastExprToType(E, Ty, Kind);
-  }
-
-  return result;
-}
-
-namespace {
-/// The original operand to an operator, prior to the application of the usual
-/// arithmetic conversions and converting the arguments of a builtin operator
-/// candidate.
-struct OriginalOperand {
-  explicit OriginalOperand(Expr *Op) : Orig(Op), Conversion(nullptr) {
-    if (auto *MTE = dyn_cast<MaterializeTemporaryExpr>(Op))
-      Op = MTE->GetTemporaryExpr();
-    if (auto *BTE = dyn_cast<CXXBindTemporaryExpr>(Op))
-      Op = BTE->getSubExpr();
-    if (auto *ICE = dyn_cast<ImplicitCastExpr>(Op)) {
-      Orig = ICE->getSubExprAsWritten();
-      Conversion = ICE->getConversionFunction();
-    }
-  }
-
-  QualType getType() const { return Orig->getType(); }
-
-  Expr *Orig;
-  NamedDecl *Conversion;
-};
-}
-
-QualType Sema::InvalidOperands(SourceLocation Loc, ExprResult &LHS,
-                               ExprResult &RHS) {
-  OriginalOperand OrigLHS(LHS.get()), OrigRHS(RHS.get());
-
-  Diag(Loc, diag::err_typecheck_invalid_operands)
-    << OrigLHS.getType() << OrigRHS.getType()
-    << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
-
-  // If a user-defined conversion was applied to either of the operands prior
-  // to applying the built-in operator rules, tell the user about it.
-  if (OrigLHS.Conversion) {
-    Diag(OrigLHS.Conversion->getLocation(),
-         diag::note_typecheck_invalid_operands_converted)
-      << 0 << LHS.get()->getType();
-  }
-  if (OrigRHS.Conversion) {
-    Diag(OrigRHS.Conversion->getLocation(),
-         diag::note_typecheck_invalid_operands_converted)
-      << 1 << RHS.get()->getType();
-  }
-
-  return QualType();
-}
-
-// Diagnose cases where a scalar was implicitly converted to a vector and
-// diagnose the underlying types. Otherwise, diagnose the error
-// as invalid vector logical operands for non-C++ cases.
-QualType Sema::InvalidLogicalVectorOperands(SourceLocation Loc, ExprResult &LHS,
-                                            ExprResult &RHS) {
-  QualType LHSType = LHS.get()->IgnoreImpCasts()->getType();
-  QualType RHSType = RHS.get()->IgnoreImpCasts()->getType();
-
-  bool LHSNatVec = LHSType->isVectorType();
-  bool RHSNatVec = RHSType->isVectorType();
-
-  if (!(LHSNatVec && RHSNatVec)) {
-    Expr *Vector = LHSNatVec ? LHS.get() : RHS.get();
-    Expr *NonVector = !LHSNatVec ? LHS.get() : RHS.get();
-    Diag(Loc, diag::err_typecheck_logical_vector_expr_gnu_cpp_restrict)
-        << 0 << Vector->getType() << NonVector->IgnoreImpCasts()->getType()
-        << Vector->getSourceRange();
-    return QualType();
-  }
-
-  Diag(Loc, diag::err_typecheck_logical_vector_expr_gnu_cpp_restrict)
-      << 1 << LHSType << RHSType << LHS.get()->getSourceRange()
-      << RHS.get()->getSourceRange();
-
-  return QualType();
-}
-
-/// Try to convert a value of non-vector type to a vector type by converting
-/// the type to the element type of the vector and then performing a splat.
-/// If the language is OpenCL, we only use conversions that promote scalar
-/// rank; for C, Obj-C, and C++ we allow any real scalar conversion except
-/// for float->int.
-///
-/// OpenCL V2.0 6.2.6.p2:
-/// An error shall occur if any scalar operand type has greater rank
-/// than the type of the vector element.
-///
-/// \param scalar - if non-null, actually perform the conversions
-/// \return true if the operation fails (but without diagnosing the failure)
-static bool tryVectorConvertAndSplat(Sema &S, ExprResult *scalar,
-                                     QualType scalarTy,
-                                     QualType vectorEltTy,
-                                     QualType vectorTy,
-                                     unsigned &DiagID) {
-  // The conversion to apply to the scalar before splatting it,
-  // if necessary.
-  CastKind scalarCast = CK_NoOp;
-
-  if (vectorEltTy->isIntegralType(S.Context)) {
-    if (S.getLangOpts().OpenCL && (scalarTy->isRealFloatingType() ||
-        (scalarTy->isIntegerType() &&
-         S.Context.getIntegerTypeOrder(vectorEltTy, scalarTy) < 0))) {
-      DiagID = diag::err_opencl_scalar_type_rank_greater_than_vector_type;
-      return true;
-    }
-    if (!scalarTy->isIntegralType(S.Context))
-      return true;
-    scalarCast = CK_IntegralCast;
-  } else if (vectorEltTy->isRealFloatingType()) {
-    if (scalarTy->isRealFloatingType()) {
-      if (S.getLangOpts().OpenCL &&
-          S.Context.getFloatingTypeOrder(vectorEltTy, scalarTy) < 0) {
-        DiagID = diag::err_opencl_scalar_type_rank_greater_than_vector_type;
-        return true;
-      }
-      scalarCast = CK_FloatingCast;
-    }
-    else if (scalarTy->isIntegralType(S.Context))
-      scalarCast = CK_IntegralToFloating;
-    else
-      return true;
-  } else {
-    return true;
-  }
-
-  // Adjust scalar if desired.
-  if (scalar) {
-    if (scalarCast != CK_NoOp)
-      *scalar = S.ImpCastExprToType(scalar->get(), vectorEltTy, scalarCast);
-    *scalar = S.ImpCastExprToType(scalar->get(), vectorTy, CK_VectorSplat);
-  }
-  return false;
-}
-
-/// Convert vector E to a vector with the same number of elements but different
-/// element type.
-static ExprResult convertVector(Expr *E, QualType ElementType, Sema &S) {
-  const auto *VecTy = E->getType()->getAs<VectorType>();
-  assert(VecTy && "Expression E must be a vector");
-  QualType NewVecTy = S.Context.getVectorType(ElementType,
-                                              VecTy->getNumElements(),
-                                              VecTy->getVectorKind());
-
-  // Look through the implicit cast. Return the subexpression if its type is
-  // NewVecTy.
-  if (auto *ICE = dyn_cast<ImplicitCastExpr>(E))
-    if (ICE->getSubExpr()->getType() == NewVecTy)
-      return ICE->getSubExpr();
-
-  auto Cast = ElementType->isIntegerType() ? CK_IntegralCast : CK_FloatingCast;
-  return S.ImpCastExprToType(E, NewVecTy, Cast);
-}
-
-/// Test if a (constant) integer Int can be casted to another integer type
-/// IntTy without losing precision.
-static bool canConvertIntToOtherIntTy(Sema &S, ExprResult *Int,
-                                      QualType OtherIntTy) {
-  QualType IntTy = Int->get()->getType().getUnqualifiedType();
-
-  // Reject cases where the value of the Int is unknown as that would
-  // possibly cause truncation, but accept cases where the scalar can be
-  // demoted without loss of precision.
-  Expr::EvalResult EVResult;
-  bool CstInt = Int->get()->EvaluateAsInt(EVResult, S.Context);
-  int Order = S.Context.getIntegerTypeOrder(OtherIntTy, IntTy);
-  bool IntSigned = IntTy->hasSignedIntegerRepresentation();
-  bool OtherIntSigned = OtherIntTy->hasSignedIntegerRepresentation();
-
-  if (CstInt) {
-    // If the scalar is constant and is of a higher order and has more active
-    // bits that the vector element type, reject it.
-    llvm::APSInt Result = EVResult.Val.getInt();
-    unsigned NumBits = IntSigned
-                           ? (Result.isNegative() ? Result.getMinSignedBits()
-                                                  : Result.getActiveBits())
-                           : Result.getActiveBits();
-    if (Order < 0 && S.Context.getIntWidth(OtherIntTy) < NumBits)
-      return true;
-
-    // If the signedness of the scalar type and the vector element type
-    // differs and the number of bits is greater than that of the vector
-    // element reject it.
-    return (IntSigned != OtherIntSigned &&
-            NumBits > S.Context.getIntWidth(OtherIntTy));
-  }
-
-  // Reject cases where the value of the scalar is not constant and it's
-  // order is greater than that of the vector element type.
-  return (Order < 0);
-}
-
-/// Test if a (constant) integer Int can be casted to floating point type
-/// FloatTy without losing precision.
-static bool canConvertIntTyToFloatTy(Sema &S, ExprResult *Int,
-                                     QualType FloatTy) {
-  QualType IntTy = Int->get()->getType().getUnqualifiedType();
-
-  // Determine if the integer constant can be expressed as a floating point
-  // number of the appropriate type.
-  Expr::EvalResult EVResult;
-  bool CstInt = Int->get()->EvaluateAsInt(EVResult, S.Context);
-
-  uint64_t Bits = 0;
-  if (CstInt) {
-    // Reject constants that would be truncated if they were converted to
-    // the floating point type. Test by simple to/from conversion.
-    // FIXME: Ideally the conversion to an APFloat and from an APFloat
-    //        could be avoided if there was a convertFromAPInt method
-    //        which could signal back if implicit truncation occurred.
-    llvm::APSInt Result = EVResult.Val.getInt();
-    llvm::APFloat Float(S.Context.getFloatTypeSemantics(FloatTy));
-    Float.convertFromAPInt(Result, IntTy->hasSignedIntegerRepresentation(),
-                           llvm::APFloat::rmTowardZero);
-    llvm::APSInt ConvertBack(S.Context.getIntWidth(IntTy),
-                             !IntTy->hasSignedIntegerRepresentation());
-    bool Ignored = false;
-    Float.convertToInteger(ConvertBack, llvm::APFloat::rmNearestTiesToEven,
-                           &Ignored);
-    if (Result != ConvertBack)
-      return true;
-  } else {
-    // Reject types that cannot be fully encoded into the mantissa of
-    // the float.
-    Bits = S.Context.getTypeSize(IntTy);
-    unsigned FloatPrec = llvm::APFloat::semanticsPrecision(
-        S.Context.getFloatTypeSemantics(FloatTy));
-    if (Bits > FloatPrec)
-      return true;
-  }
-
-  return false;
-}
-
-/// Attempt to convert and splat Scalar into a vector whose types matches
-/// Vector following GCC conversion rules. The rule is that implicit
-/// conversion can occur when Scalar can be casted to match Vector's element
-/// type without causing truncation of Scalar.
-static bool tryGCCVectorConvertAndSplat(Sema &S, ExprResult *Scalar,
-                                        ExprResult *Vector) {
-  QualType ScalarTy = Scalar->get()->getType().getUnqualifiedType();
-  QualType VectorTy = Vector->get()->getType().getUnqualifiedType();
-  const VectorType *VT = VectorTy->getAs<VectorType>();
-
-  assert(!isa<ExtVectorType>(VT) &&
-         "ExtVectorTypes should not be handled here!");
-
-  QualType VectorEltTy = VT->getElementType();
-
-  // Reject cases where the vector element type or the scalar element type are
-  // not integral or floating point types.
-  if (!VectorEltTy->isArithmeticType() || !ScalarTy->isArithmeticType())
-    return true;
-
-  // The conversion to apply to the scalar before splatting it,
-  // if necessary.
-  CastKind ScalarCast = CK_NoOp;
-
-  // Accept cases where the vector elements are integers and the scalar is
-  // an integer.
-  // FIXME: Notionally if the scalar was a floating point value with a precise
-  //        integral representation, we could cast it to an appropriate integer
-  //        type and then perform the rest of the checks here. GCC will perform
-  //        this conversion in some cases as determined by the input language.
-  //        We should accept it on a language independent basis.
-  if (VectorEltTy->isIntegralType(S.Context) &&
-      ScalarTy->isIntegralType(S.Context) &&
-      S.Context.getIntegerTypeOrder(VectorEltTy, ScalarTy)) {
-
-    if (canConvertIntToOtherIntTy(S, Scalar, VectorEltTy))
-      return true;
-
-    ScalarCast = CK_IntegralCast;
-  } else if (VectorEltTy->isRealFloatingType()) {
-    if (ScalarTy->isRealFloatingType()) {
-
-      // Reject cases where the scalar type is not a constant and has a higher
-      // Order than the vector element type.
-      llvm::APFloat Result(0.0);
-      bool CstScalar = Scalar->get()->EvaluateAsFloat(Result, S.Context);
-      int Order = S.Context.getFloatingTypeOrder(VectorEltTy, ScalarTy);
-      if (!CstScalar && Order < 0)
-        return true;
-
-      // If the scalar cannot be safely casted to the vector element type,
-      // reject it.
-      if (CstScalar) {
-        bool Truncated = false;
-        Result.convert(S.Context.getFloatTypeSemantics(VectorEltTy),
-                       llvm::APFloat::rmNearestTiesToEven, &Truncated);
-        if (Truncated)
-          return true;
-      }
-
-      ScalarCast = CK_FloatingCast;
-    } else if (ScalarTy->isIntegralType(S.Context)) {
-      if (canConvertIntTyToFloatTy(S, Scalar, VectorEltTy))
-        return true;
-
-      ScalarCast = CK_IntegralToFloating;
-    } else
-      return true;
-  }
-
-  // Adjust scalar if desired.
-  if (Scalar) {
-    if (ScalarCast != CK_NoOp)
-      *Scalar = S.ImpCastExprToType(Scalar->get(), VectorEltTy, ScalarCast);
-    *Scalar = S.ImpCastExprToType(Scalar->get(), VectorTy, CK_VectorSplat);
-  }
-  return false;
-}
-
-QualType Sema::CheckVectorOperands(ExprResult &LHS, ExprResult &RHS,
-                                   SourceLocation Loc, bool IsCompAssign,
-                                   bool AllowBothBool,
-                                   bool AllowBoolConversions) {
-  if (!IsCompAssign) {
-    LHS = DefaultFunctionArrayLvalueConversion(LHS.get());
-    if (LHS.isInvalid())
-      return QualType();
-  }
-  RHS = DefaultFunctionArrayLvalueConversion(RHS.get());
-  if (RHS.isInvalid())
-    return QualType();
-
-  // For conversion purposes, we ignore any qualifiers.
-  // For example, "const float" and "float" are equivalent.
-  QualType LHSType = LHS.get()->getType().getUnqualifiedType();
-  QualType RHSType = RHS.get()->getType().getUnqualifiedType();
-
-  const VectorType *LHSVecType = LHSType->getAs<VectorType>();
-  const VectorType *RHSVecType = RHSType->getAs<VectorType>();
-  assert(LHSVecType || RHSVecType);
-
-  // AltiVec-style "vector bool op vector bool" combinations are allowed
-  // for some operators but not others.
-  if (!AllowBothBool &&
-      LHSVecType && LHSVecType->getVectorKind() == VectorType::AltiVecBool &&
-      RHSVecType && RHSVecType->getVectorKind() == VectorType::AltiVecBool)
-    return InvalidOperands(Loc, LHS, RHS);
-
-  // If the vector types are identical, return.
-  if (Context.hasSameType(LHSType, RHSType))
-    return LHSType;
-
-  // If we have compatible AltiVec and GCC vector types, use the AltiVec type.
-  if (LHSVecType && RHSVecType &&
-      Context.areCompatibleVectorTypes(LHSType, RHSType)) {
-    if (isa<ExtVectorType>(LHSVecType)) {
-      RHS = ImpCastExprToType(RHS.get(), LHSType, CK_BitCast);
-      return LHSType;
-    }
-
-    if (!IsCompAssign)
-      LHS = ImpCastExprToType(LHS.get(), RHSType, CK_BitCast);
-    return RHSType;
-  }
-
-  // AllowBoolConversions says that bool and non-bool AltiVec vectors
-  // can be mixed, with the result being the non-bool type.  The non-bool
-  // operand must have integer element type.
-  if (AllowBoolConversions && LHSVecType && RHSVecType &&
-      LHSVecType->getNumElements() == RHSVecType->getNumElements() &&
-      (Context.getTypeSize(LHSVecType->getElementType()) ==
-       Context.getTypeSize(RHSVecType->getElementType()))) {
-    if (LHSVecType->getVectorKind() == VectorType::AltiVecVector &&
-        LHSVecType->getElementType()->isIntegerType() &&
-        RHSVecType->getVectorKind() == VectorType::AltiVecBool) {
-      RHS = ImpCastExprToType(RHS.get(), LHSType, CK_BitCast);
-      return LHSType;
-    }
-    if (!IsCompAssign &&
-        LHSVecType->getVectorKind() == VectorType::AltiVecBool &&
-        RHSVecType->getVectorKind() == VectorType::AltiVecVector &&
-        RHSVecType->getElementType()->isIntegerType()) {
-      LHS = ImpCastExprToType(LHS.get(), RHSType, CK_BitCast);
-      return RHSType;
-    }
-  }
-
-  // If there's a vector type and a scalar, try to convert the scalar to
-  // the vector element type and splat.
-  unsigned DiagID = diag::err_typecheck_vector_not_convertable;
-  if (!RHSVecType) {
-    if (isa<ExtVectorType>(LHSVecType)) {
-      if (!tryVectorConvertAndSplat(*this, &RHS, RHSType,
-                                    LHSVecType->getElementType(), LHSType,
-                                    DiagID))
-        return LHSType;
-    } else {
-      if (!tryGCCVectorConvertAndSplat(*this, &RHS, &LHS))
-        return LHSType;
-    }
-  }
-  if (!LHSVecType) {
-    if (isa<ExtVectorType>(RHSVecType)) {
-      if (!tryVectorConvertAndSplat(*this, (IsCompAssign ? nullptr : &LHS),
-                                    LHSType, RHSVecType->getElementType(),
-                                    RHSType, DiagID))
-        return RHSType;
-    } else {
-      if (LHS.get()->getValueKind() == VK_LValue ||
-          !tryGCCVectorConvertAndSplat(*this, &LHS, &RHS))
-        return RHSType;
-    }
-  }
-
-  // FIXME: The code below also handles conversion between vectors and
-  // non-scalars, we should break this down into fine grained specific checks
-  // and emit proper diagnostics.
-  QualType VecType = LHSVecType ? LHSType : RHSType;
-  const VectorType *VT = LHSVecType ? LHSVecType : RHSVecType;
-  QualType OtherType = LHSVecType ? RHSType : LHSType;
-  ExprResult *OtherExpr = LHSVecType ? &RHS : &LHS;
-  if (isLaxVectorConversion(OtherType, VecType)) {
-    // If we're allowing lax vector conversions, only the total (data) size
-    // needs to be the same. For non compound assignment, if one of the types is
-    // scalar, the result is always the vector type.
-    if (!IsCompAssign) {
-      *OtherExpr = ImpCastExprToType(OtherExpr->get(), VecType, CK_BitCast);
-      return VecType;
-    // In a compound assignment, lhs += rhs, 'lhs' is a lvalue src, forbidding
-    // any implicit cast. Here, the 'rhs' should be implicit casted to 'lhs'
-    // type. Note that this is already done by non-compound assignments in
-    // CheckAssignmentConstraints. If it's a scalar type, only bitcast for
-    // <1 x T> -> T. The result is also a vector type.
-    } else if (OtherType->isExtVectorType() || OtherType->isVectorType() ||
-               (OtherType->isScalarType() && VT->getNumElements() == 1)) {
-      ExprResult *RHSExpr = &RHS;
-      *RHSExpr = ImpCastExprToType(RHSExpr->get(), LHSType, CK_BitCast);
-      return VecType;
-    }
-  }
-
-  // Okay, the expression is invalid.
-
-  // If there's a non-vector, non-real operand, diagnose that.
-  if ((!RHSVecType && !RHSType->isRealType()) ||
-      (!LHSVecType && !LHSType->isRealType())) {
-    Diag(Loc, diag::err_typecheck_vector_not_convertable_non_scalar)
-      << LHSType << RHSType
-      << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
-    return QualType();
-  }
-
-  // OpenCL V1.1 6.2.6.p1:
-  // If the operands are of more than one vector type, then an error shall
-  // occur. Implicit conversions between vector types are not permitted, per
-  // section 6.2.1.
-  if (getLangOpts().OpenCL &&
-      RHSVecType && isa<ExtVectorType>(RHSVecType) &&
-      LHSVecType && isa<ExtVectorType>(LHSVecType)) {
-    Diag(Loc, diag::err_opencl_implicit_vector_conversion) << LHSType
-                                                           << RHSType;
-    return QualType();
-  }
-
-
-  // If there is a vector type that is not a ExtVector and a scalar, we reach
-  // this point if scalar could not be converted to the vector's element type
-  // without truncation.
-  if ((RHSVecType && !isa<ExtVectorType>(RHSVecType)) ||
-      (LHSVecType && !isa<ExtVectorType>(LHSVecType))) {
-    QualType Scalar = LHSVecType ? RHSType : LHSType;
-    QualType Vector = LHSVecType ? LHSType : RHSType;
-    unsigned ScalarOrVector = LHSVecType && RHSVecType ? 1 : 0;
-    Diag(Loc,
-         diag::err_typecheck_vector_not_convertable_implict_truncation)
-        << ScalarOrVector << Scalar << Vector;
-
-    return QualType();
-  }
-
-  // Otherwise, use the generic diagnostic.
-  Diag(Loc, DiagID)
-    << LHSType << RHSType
-    << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
-  return QualType();
-}
-
-// checkArithmeticNull - Detect when a NULL constant is used improperly in an
-// expression.  These are mainly cases where the null pointer is used as an
-// integer instead of a pointer.
-static void checkArithmeticNull(Sema &S, ExprResult &LHS, ExprResult &RHS,
-                                SourceLocation Loc, bool IsCompare) {
-  // The canonical way to check for a GNU null is with isNullPointerConstant,
-  // but we use a bit of a hack here for speed; this is a relatively
-  // hot path, and isNullPointerConstant is slow.
-  bool LHSNull = isa<GNUNullExpr>(LHS.get()->IgnoreParenImpCasts());
-  bool RHSNull = isa<GNUNullExpr>(RHS.get()->IgnoreParenImpCasts());
-
-  QualType NonNullType = LHSNull ? RHS.get()->getType() : LHS.get()->getType();
-
-  // Avoid analyzing cases where the result will either be invalid (and
-  // diagnosed as such) or entirely valid and not something to warn about.
-  if ((!LHSNull && !RHSNull) || NonNullType->isBlockPointerType() ||
-      NonNullType->isMemberPointerType() || NonNullType->isFunctionType())
-    return;
-
-  // Comparison operations would not make sense with a null pointer no matter
-  // what the other expression is.
-  if (!IsCompare) {
-    S.Diag(Loc, diag::warn_null_in_arithmetic_operation)
-        << (LHSNull ? LHS.get()->getSourceRange() : SourceRange())
-        << (RHSNull ? RHS.get()->getSourceRange() : SourceRange());
-    return;
-  }
-
-  // The rest of the operations only make sense with a null pointer
-  // if the other expression is a pointer.
-  if (LHSNull == RHSNull || NonNullType->isAnyPointerType() ||
-      NonNullType->canDecayToPointerType())
-    return;
-
-  S.Diag(Loc, diag::warn_null_in_comparison_operation)
-      << LHSNull /* LHS is NULL */ << NonNullType
-      << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
-}
-
-static void DiagnoseDivisionSizeofPointer(Sema &S, Expr *LHS, Expr *RHS,
-                                          SourceLocation Loc) {
-  const auto *LUE = dyn_cast<UnaryExprOrTypeTraitExpr>(LHS);
-  const auto *RUE = dyn_cast<UnaryExprOrTypeTraitExpr>(RHS);
-  if (!LUE || !RUE)
-    return;
-  if (LUE->getKind() != UETT_SizeOf || LUE->isArgumentType() ||
-      RUE->getKind() != UETT_SizeOf)
-    return;
-
-  QualType LHSTy = LUE->getArgumentExpr()->IgnoreParens()->getType();
-  QualType RHSTy;
-
-  if (RUE->isArgumentType())
-    RHSTy = RUE->getArgumentType();
-  else
-    RHSTy = RUE->getArgumentExpr()->IgnoreParens()->getType();
-
-  if (!LHSTy->isPointerType() || RHSTy->isPointerType())
-    return;
-  if (LHSTy->getPointeeType() != RHSTy)
-    return;
-
-  S.Diag(Loc, diag::warn_division_sizeof_ptr) << LHS << LHS->getSourceRange();
-}
-
-static void DiagnoseBadDivideOrRemainderValues(Sema& S, ExprResult &LHS,
-                                               ExprResult &RHS,
-                                               SourceLocation Loc, bool IsDiv) {
-  // Check for division/remainder by zero.
-  Expr::EvalResult RHSValue;
-  if (!RHS.get()->isValueDependent() &&
-      RHS.get()->EvaluateAsInt(RHSValue, S.Context) &&
-      RHSValue.Val.getInt() == 0)
-    S.DiagRuntimeBehavior(Loc, RHS.get(),
-                          S.PDiag(diag::warn_remainder_division_by_zero)
-                            << IsDiv << RHS.get()->getSourceRange());
-}
-
-QualType Sema::CheckMultiplyDivideOperands(ExprResult &LHS, ExprResult &RHS,
-                                           SourceLocation Loc,
-                                           bool IsCompAssign, bool IsDiv) {
-  checkArithmeticNull(*this, LHS, RHS, Loc, /*isCompare=*/false);
-
-  if (LHS.get()->getType()->isVectorType() ||
-      RHS.get()->getType()->isVectorType())
-    return CheckVectorOperands(LHS, RHS, Loc, IsCompAssign,
-                               /*AllowBothBool*/getLangOpts().AltiVec,
-                               /*AllowBoolConversions*/false);
-
-  QualType compType = UsualArithmeticConversions(LHS, RHS, IsCompAssign);
-  if (LHS.isInvalid() || RHS.isInvalid())
-    return QualType();
-
-
-  if (compType.isNull() || !compType->isArithmeticType())
-    return InvalidOperands(Loc, LHS, RHS);
-  if (IsDiv) {
-    DiagnoseBadDivideOrRemainderValues(*this, LHS, RHS, Loc, IsDiv);
-    DiagnoseDivisionSizeofPointer(*this, LHS.get(), RHS.get(), Loc);
-  }
-  return compType;
-}
-
-QualType Sema::CheckRemainderOperands(
-  ExprResult &LHS, ExprResult &RHS, SourceLocation Loc, bool IsCompAssign) {
-  checkArithmeticNull(*this, LHS, RHS, Loc, /*isCompare=*/false);
-
-  if (LHS.get()->getType()->isVectorType() ||
-      RHS.get()->getType()->isVectorType()) {
-    if (LHS.get()->getType()->hasIntegerRepresentation() &&
-        RHS.get()->getType()->hasIntegerRepresentation())
-      return CheckVectorOperands(LHS, RHS, Loc, IsCompAssign,
-                                 /*AllowBothBool*/getLangOpts().AltiVec,
-                                 /*AllowBoolConversions*/false);
-    return InvalidOperands(Loc, LHS, RHS);
-  }
-
-  QualType compType = UsualArithmeticConversions(LHS, RHS, IsCompAssign);
-  if (LHS.isInvalid() || RHS.isInvalid())
-    return QualType();
-
-  if (compType.isNull() || !compType->isIntegerType())
-    return InvalidOperands(Loc, LHS, RHS);
-  DiagnoseBadDivideOrRemainderValues(*this, LHS, RHS, Loc, false /* IsDiv */);
-  return compType;
-}
-
-/// Diagnose invalid arithmetic on two void pointers.
-static void diagnoseArithmeticOnTwoVoidPointers(Sema &S, SourceLocation Loc,
-                                                Expr *LHSExpr, Expr *RHSExpr) {
-  S.Diag(Loc, S.getLangOpts().CPlusPlus
-                ? diag::err_typecheck_pointer_arith_void_type
-                : diag::ext_gnu_void_ptr)
-    << 1 /* two pointers */ << LHSExpr->getSourceRange()
-                            << RHSExpr->getSourceRange();
-}
-
-/// Diagnose invalid arithmetic on a void pointer.
-static void diagnoseArithmeticOnVoidPointer(Sema &S, SourceLocation Loc,
-                                            Expr *Pointer) {
-  S.Diag(Loc, S.getLangOpts().CPlusPlus
-                ? diag::err_typecheck_pointer_arith_void_type
-                : diag::ext_gnu_void_ptr)
-    << 0 /* one pointer */ << Pointer->getSourceRange();
-}
-
-/// Diagnose invalid arithmetic on a null pointer.
-///
-/// If \p IsGNUIdiom is true, the operation is using the 'p = (i8*)nullptr + n'
-/// idiom, which we recognize as a GNU extension.
-///
-static void diagnoseArithmeticOnNullPointer(Sema &S, SourceLocation Loc,
-                                            Expr *Pointer, bool IsGNUIdiom) {
-  if (IsGNUIdiom)
-    S.Diag(Loc, diag::warn_gnu_null_ptr_arith)
-      << Pointer->getSourceRange();
-  else
-    S.Diag(Loc, diag::warn_pointer_arith_null_ptr)
-      << S.getLangOpts().CPlusPlus << Pointer->getSourceRange();
-}
-
-/// Diagnose invalid arithmetic on two function pointers.
-static void diagnoseArithmeticOnTwoFunctionPointers(Sema &S, SourceLocation Loc,
-                                                    Expr *LHS, Expr *RHS) {
-  assert(LHS->getType()->isAnyPointerType());
-  assert(RHS->getType()->isAnyPointerType());
-  S.Diag(Loc, S.getLangOpts().CPlusPlus
-                ? diag::err_typecheck_pointer_arith_function_type
-                : diag::ext_gnu_ptr_func_arith)
-    << 1 /* two pointers */ << LHS->getType()->getPointeeType()
-    // We only show the second type if it differs from the first.
-    << (unsigned)!S.Context.hasSameUnqualifiedType(LHS->getType(),
-                                                   RHS->getType())
-    << RHS->getType()->getPointeeType()
-    << LHS->getSourceRange() << RHS->getSourceRange();
-}
-
-/// Diagnose invalid arithmetic on a function pointer.
-static void diagnoseArithmeticOnFunctionPointer(Sema &S, SourceLocation Loc,
-                                                Expr *Pointer) {
-  assert(Pointer->getType()->isAnyPointerType());
-  S.Diag(Loc, S.getLangOpts().CPlusPlus
-                ? diag::err_typecheck_pointer_arith_function_type
-                : diag::ext_gnu_ptr_func_arith)
-    << 0 /* one pointer */ << Pointer->getType()->getPointeeType()
-    << 0 /* one pointer, so only one type */
-    << Pointer->getSourceRange();
-}
-
-/// Emit error if Operand is incomplete pointer type
-///
-/// \returns True if pointer has incomplete type
-static bool checkArithmeticIncompletePointerType(Sema &S, SourceLocation Loc,
-                                                 Expr *Operand) {
-  QualType ResType = Operand->getType();
-  if (const AtomicType *ResAtomicType = ResType->getAs<AtomicType>())
-    ResType = ResAtomicType->getValueType();
-
-  assert(ResType->isAnyPointerType() && !ResType->isDependentType());
-  QualType PointeeTy = ResType->getPointeeType();
-  return S.RequireCompleteType(Loc, PointeeTy,
-                               diag::err_typecheck_arithmetic_incomplete_type,
-                               PointeeTy, Operand->getSourceRange());
-}
-
-/// Check the validity of an arithmetic pointer operand.
-///
-/// If the operand has pointer type, this code will check for pointer types
-/// which are invalid in arithmetic operations. These will be diagnosed
-/// appropriately, including whether or not the use is supported as an
-/// extension.
-///
-/// \returns True when the operand is valid to use (even if as an extension).
-static bool checkArithmeticOpPointerOperand(Sema &S, SourceLocation Loc,
-                                            Expr *Operand) {
-  QualType ResType = Operand->getType();
-  if (const AtomicType *ResAtomicType = ResType->getAs<AtomicType>())
-    ResType = ResAtomicType->getValueType();
-
-  if (!ResType->isAnyPointerType()) return true;
-
-  QualType PointeeTy = ResType->getPointeeType();
-  if (PointeeTy->isVoidType()) {
-    diagnoseArithmeticOnVoidPointer(S, Loc, Operand);
-    return !S.getLangOpts().CPlusPlus;
-  }
-  if (PointeeTy->isFunctionType()) {
-    diagnoseArithmeticOnFunctionPointer(S, Loc, Operand);
-    return !S.getLangOpts().CPlusPlus;
-  }
-
-  if (checkArithmeticIncompletePointerType(S, Loc, Operand)) return false;
-
-  return true;
-}
-
-/// Check the validity of a binary arithmetic operation w.r.t. pointer
-/// operands.
-///
-/// This routine will diagnose any invalid arithmetic on pointer operands much
-/// like \see checkArithmeticOpPointerOperand. However, it has special logic
-/// for emitting a single diagnostic even for operations where both LHS and RHS
-/// are (potentially problematic) pointers.
-///
-/// \returns True when the operand is valid to use (even if as an extension).
-static bool checkArithmeticBinOpPointerOperands(Sema &S, SourceLocation Loc,
-                                                Expr *LHSExpr, Expr *RHSExpr) {
-  bool isLHSPointer = LHSExpr->getType()->isAnyPointerType();
-  bool isRHSPointer = RHSExpr->getType()->isAnyPointerType();
-  if (!isLHSPointer && !isRHSPointer) return true;
-
-  QualType LHSPointeeTy, RHSPointeeTy;
-  if (isLHSPointer) LHSPointeeTy = LHSExpr->getType()->getPointeeType();
-  if (isRHSPointer) RHSPointeeTy = RHSExpr->getType()->getPointeeType();
-
-  // if both are pointers check if operation is valid wrt address spaces
-  if (S.getLangOpts().OpenCL && isLHSPointer && isRHSPointer) {
-    const PointerType *lhsPtr = LHSExpr->getType()->getAs<PointerType>();
-    const PointerType *rhsPtr = RHSExpr->getType()->getAs<PointerType>();
-    if (!lhsPtr->isAddressSpaceOverlapping(*rhsPtr)) {
-      S.Diag(Loc,
-             diag::err_typecheck_op_on_nonoverlapping_address_space_pointers)
-          << LHSExpr->getType() << RHSExpr->getType() << 1 /*arithmetic op*/
-          << LHSExpr->getSourceRange() << RHSExpr->getSourceRange();
-      return false;
-    }
-  }
-
-  // Check for arithmetic on pointers to incomplete types.
-  bool isLHSVoidPtr = isLHSPointer && LHSPointeeTy->isVoidType();
-  bool isRHSVoidPtr = isRHSPointer && RHSPointeeTy->isVoidType();
-  if (isLHSVoidPtr || isRHSVoidPtr) {
-    if (!isRHSVoidPtr) diagnoseArithmeticOnVoidPointer(S, Loc, LHSExpr);
-    else if (!isLHSVoidPtr) diagnoseArithmeticOnVoidPointer(S, Loc, RHSExpr);
-    else diagnoseArithmeticOnTwoVoidPointers(S, Loc, LHSExpr, RHSExpr);
-
-    return !S.getLangOpts().CPlusPlus;
-  }
-
-  bool isLHSFuncPtr = isLHSPointer && LHSPointeeTy->isFunctionType();
-  bool isRHSFuncPtr = isRHSPointer && RHSPointeeTy->isFunctionType();
-  if (isLHSFuncPtr || isRHSFuncPtr) {
-    if (!isRHSFuncPtr) diagnoseArithmeticOnFunctionPointer(S, Loc, LHSExpr);
-    else if (!isLHSFuncPtr) diagnoseArithmeticOnFunctionPointer(S, Loc,
-                                                                RHSExpr);
-    else diagnoseArithmeticOnTwoFunctionPointers(S, Loc, LHSExpr, RHSExpr);
-
-    return !S.getLangOpts().CPlusPlus;
-  }
-
-  if (isLHSPointer && checkArithmeticIncompletePointerType(S, Loc, LHSExpr))
-    return false;
-  if (isRHSPointer && checkArithmeticIncompletePointerType(S, Loc, RHSExpr))
-    return false;
-
-  return true;
-}
-
-/// diagnoseStringPlusInt - Emit a warning when adding an integer to a string
-/// literal.
-static void diagnoseStringPlusInt(Sema &Self, SourceLocation OpLoc,
-                                  Expr *LHSExpr, Expr *RHSExpr) {
-  StringLiteral* StrExpr = dyn_cast<StringLiteral>(LHSExpr->IgnoreImpCasts());
-  Expr* IndexExpr = RHSExpr;
-  if (!StrExpr) {
-    StrExpr = dyn_cast<StringLiteral>(RHSExpr->IgnoreImpCasts());
-    IndexExpr = LHSExpr;
-  }
-
-  bool IsStringPlusInt = StrExpr &&
-      IndexExpr->getType()->isIntegralOrUnscopedEnumerationType();
-  if (!IsStringPlusInt || IndexExpr->isValueDependent())
-    return;
-
-  SourceRange DiagRange(LHSExpr->getBeginLoc(), RHSExpr->getEndLoc());
-  Self.Diag(OpLoc, diag::warn_string_plus_int)
-      << DiagRange << IndexExpr->IgnoreImpCasts()->getType();
-
-  // Only print a fixit for "str" + int, not for int + "str".
-  if (IndexExpr == RHSExpr) {
-    SourceLocation EndLoc = Self.getLocForEndOfToken(RHSExpr->getEndLoc());
-    Self.Diag(OpLoc, diag::note_string_plus_scalar_silence)
-        << FixItHint::CreateInsertion(LHSExpr->getBeginLoc(), "&")
-        << FixItHint::CreateReplacement(SourceRange(OpLoc), "[")
-        << FixItHint::CreateInsertion(EndLoc, "]");
-  } else
-    Self.Diag(OpLoc, diag::note_string_plus_scalar_silence);
-}
-
-/// Emit a warning when adding a char literal to a string.
-static void diagnoseStringPlusChar(Sema &Self, SourceLocation OpLoc,
-                                   Expr *LHSExpr, Expr *RHSExpr) {
-  const Expr *StringRefExpr = LHSExpr;
-  const CharacterLiteral *CharExpr =
-      dyn_cast<CharacterLiteral>(RHSExpr->IgnoreImpCasts());
-
-  if (!CharExpr) {
-    CharExpr = dyn_cast<CharacterLiteral>(LHSExpr->IgnoreImpCasts());
-    StringRefExpr = RHSExpr;
-  }
-
-  if (!CharExpr || !StringRefExpr)
-    return;
-
-  const QualType StringType = StringRefExpr->getType();
-
-  // Return if not a PointerType.
-  if (!StringType->isAnyPointerType())
-    return;
-
-  // Return if not a CharacterType.
-  if (!StringType->getPointeeType()->isAnyCharacterType())
-    return;
-
-  ASTContext &Ctx = Self.getASTContext();
-  SourceRange DiagRange(LHSExpr->getBeginLoc(), RHSExpr->getEndLoc());
-
-  const QualType CharType = CharExpr->getType();
-  if (!CharType->isAnyCharacterType() &&
-      CharType->isIntegerType() &&
-      llvm::isUIntN(Ctx.getCharWidth(), CharExpr->getValue())) {
-    Self.Diag(OpLoc, diag::warn_string_plus_char)
-        << DiagRange << Ctx.CharTy;
-  } else {
-    Self.Diag(OpLoc, diag::warn_string_plus_char)
-        << DiagRange << CharExpr->getType();
-  }
-
-  // Only print a fixit for str + char, not for char + str.
-  if (isa<CharacterLiteral>(RHSExpr->IgnoreImpCasts())) {
-    SourceLocation EndLoc = Self.getLocForEndOfToken(RHSExpr->getEndLoc());
-    Self.Diag(OpLoc, diag::note_string_plus_scalar_silence)
-        << FixItHint::CreateInsertion(LHSExpr->getBeginLoc(), "&")
-        << FixItHint::CreateReplacement(SourceRange(OpLoc), "[")
-        << FixItHint::CreateInsertion(EndLoc, "]");
-  } else {
-    Self.Diag(OpLoc, diag::note_string_plus_scalar_silence);
-  }
-}
-
-/// Emit error when two pointers are incompatible.
-static void diagnosePointerIncompatibility(Sema &S, SourceLocation Loc,
-                                           Expr *LHSExpr, Expr *RHSExpr) {
-  assert(LHSExpr->getType()->isAnyPointerType());
-  assert(RHSExpr->getType()->isAnyPointerType());
-  S.Diag(Loc, diag::err_typecheck_sub_ptr_compatible)
-    << LHSExpr->getType() << RHSExpr->getType() << LHSExpr->getSourceRange()
-    << RHSExpr->getSourceRange();
-}
-
-// C99 6.5.6
-QualType Sema::CheckAdditionOperands(ExprResult &LHS, ExprResult &RHS,
-                                     SourceLocation Loc, BinaryOperatorKind Opc,
-                                     QualType* CompLHSTy) {
-  checkArithmeticNull(*this, LHS, RHS, Loc, /*isCompare=*/false);
-
-  if (LHS.get()->getType()->isVectorType() ||
-      RHS.get()->getType()->isVectorType()) {
-    QualType compType = CheckVectorOperands(
-        LHS, RHS, Loc, CompLHSTy,
-        /*AllowBothBool*/getLangOpts().AltiVec,
-        /*AllowBoolConversions*/getLangOpts().ZVector);
-    if (CompLHSTy) *CompLHSTy = compType;
-    return compType;
-  }
-
-  QualType compType = UsualArithmeticConversions(LHS, RHS, CompLHSTy);
-  if (LHS.isInvalid() || RHS.isInvalid())
-    return QualType();
-
-  // Diagnose "string literal" '+' int and string '+' "char literal".
-  if (Opc == BO_Add) {
-    diagnoseStringPlusInt(*this, Loc, LHS.get(), RHS.get());
-    diagnoseStringPlusChar(*this, Loc, LHS.get(), RHS.get());
-  }
-
-  // handle the common case first (both operands are arithmetic).
-  if (!compType.isNull() && compType->isArithmeticType()) {
-    if (CompLHSTy) *CompLHSTy = compType;
-    return compType;
-  }
-
-  // Type-checking.  Ultimately the pointer's going to be in PExp;
-  // note that we bias towards the LHS being the pointer.
-  Expr *PExp = LHS.get(), *IExp = RHS.get();
-
-  bool isObjCPointer;
-  if (PExp->getType()->isPointerType()) {
-    isObjCPointer = false;
-  } else if (PExp->getType()->isObjCObjectPointerType()) {
-    isObjCPointer = true;
-  } else {
-    std::swap(PExp, IExp);
-    if (PExp->getType()->isPointerType()) {
-      isObjCPointer = false;
-    } else if (PExp->getType()->isObjCObjectPointerType()) {
-      isObjCPointer = true;
-    } else {
-      return InvalidOperands(Loc, LHS, RHS);
-    }
-  }
-  assert(PExp->getType()->isAnyPointerType());
-
-  if (!IExp->getType()->isIntegerType())
-    return InvalidOperands(Loc, LHS, RHS);
-
-  // Adding to a null pointer results in undefined behavior.
-  if (PExp->IgnoreParenCasts()->isNullPointerConstant(
-          Context, Expr::NPC_ValueDependentIsNotNull)) {
-    // In C++ adding zero to a null pointer is defined.
-    Expr::EvalResult KnownVal;
-    if (!getLangOpts().CPlusPlus ||
-        (!IExp->isValueDependent() &&
-         (!IExp->EvaluateAsInt(KnownVal, Context) ||
-          KnownVal.Val.getInt() != 0))) {
-      // Check the conditions to see if this is the 'p = nullptr + n' idiom.
-      bool IsGNUIdiom = BinaryOperator::isNullPointerArithmeticExtension(
-          Context, BO_Add, PExp, IExp);
-      diagnoseArithmeticOnNullPointer(*this, Loc, PExp, IsGNUIdiom);
-    }
-  }
-
-  if (!checkArithmeticOpPointerOperand(*this, Loc, PExp))
-    return QualType();
-
-  if (isObjCPointer && checkArithmeticOnObjCPointer(*this, Loc, PExp))
-    return QualType();
-
-  // Check array bounds for pointer arithemtic
-  CheckArrayAccess(PExp, IExp);
-
-  if (CompLHSTy) {
-    QualType LHSTy = Context.isPromotableBitField(LHS.get());
-    if (LHSTy.isNull()) {
-      LHSTy = LHS.get()->getType();
-      if (LHSTy->isPromotableIntegerType())
-        LHSTy = Context.getPromotedIntegerType(LHSTy);
-    }
-    *CompLHSTy = LHSTy;
-  }
-
-  return PExp->getType();
-}
-
-// C99 6.5.6
-QualType Sema::CheckSubtractionOperands(ExprResult &LHS, ExprResult &RHS,
-                                        SourceLocation Loc,
-                                        QualType* CompLHSTy) {
-  checkArithmeticNull(*this, LHS, RHS, Loc, /*isCompare=*/false);
-
-  if (LHS.get()->getType()->isVectorType() ||
-      RHS.get()->getType()->isVectorType()) {
-    QualType compType = CheckVectorOperands(
-        LHS, RHS, Loc, CompLHSTy,
-        /*AllowBothBool*/getLangOpts().AltiVec,
-        /*AllowBoolConversions*/getLangOpts().ZVector);
-    if (CompLHSTy) *CompLHSTy = compType;
-    return compType;
-  }
-
-  QualType compType = UsualArithmeticConversions(LHS, RHS, CompLHSTy);
-  if (LHS.isInvalid() || RHS.isInvalid())
-    return QualType();
-
-  // Enforce type constraints: C99 6.5.6p3.
-
-  // Handle the common case first (both operands are arithmetic).
-  if (!compType.isNull() && compType->isArithmeticType()) {
-    if (CompLHSTy) *CompLHSTy = compType;
-    return compType;
-  }
-
-  // Either ptr - int   or   ptr - ptr.
-  if (LHS.get()->getType()->isAnyPointerType()) {
-    QualType lpointee = LHS.get()->getType()->getPointeeType();
-
-    // Diagnose bad cases where we step over interface counts.
-    if (LHS.get()->getType()->isObjCObjectPointerType() &&
-        checkArithmeticOnObjCPointer(*this, Loc, LHS.get()))
-      return QualType();
-
-    // The result type of a pointer-int computation is the pointer type.
-    if (RHS.get()->getType()->isIntegerType()) {
-      // Subtracting from a null pointer should produce a warning.
-      // The last argument to the diagnose call says this doesn't match the
-      // GNU int-to-pointer idiom.
-      if (LHS.get()->IgnoreParenCasts()->isNullPointerConstant(Context,
-                                           Expr::NPC_ValueDependentIsNotNull)) {
-        // In C++ adding zero to a null pointer is defined.
-        Expr::EvalResult KnownVal;
-        if (!getLangOpts().CPlusPlus ||
-            (!RHS.get()->isValueDependent() &&
-             (!RHS.get()->EvaluateAsInt(KnownVal, Context) ||
-              KnownVal.Val.getInt() != 0))) {
-          diagnoseArithmeticOnNullPointer(*this, Loc, LHS.get(), false);
-        }
-      }
-
-      if (!checkArithmeticOpPointerOperand(*this, Loc, LHS.get()))
-        return QualType();
-
-      // Check array bounds for pointer arithemtic
-      CheckArrayAccess(LHS.get(), RHS.get(), /*ArraySubscriptExpr*/nullptr,
-                       /*AllowOnePastEnd*/true, /*IndexNegated*/true);
-
-      if (CompLHSTy) *CompLHSTy = LHS.get()->getType();
-      return LHS.get()->getType();
-    }
-
-    // Handle pointer-pointer subtractions.
-    if (const PointerType *RHSPTy
-          = RHS.get()->getType()->getAs<PointerType>()) {
-      QualType rpointee = RHSPTy->getPointeeType();
-
-      if (getLangOpts().CPlusPlus) {
-        // Pointee types must be the same: C++ [expr.add]
-        if (!Context.hasSameUnqualifiedType(lpointee, rpointee)) {
-          diagnosePointerIncompatibility(*this, Loc, LHS.get(), RHS.get());
-        }
-      } else {
-        // Pointee types must be compatible C99 6.5.6p3
-        if (!Context.typesAreCompatible(
-                Context.getCanonicalType(lpointee).getUnqualifiedType(),
-                Context.getCanonicalType(rpointee).getUnqualifiedType())) {
-          diagnosePointerIncompatibility(*this, Loc, LHS.get(), RHS.get());
-          return QualType();
-        }
-      }
-
-      if (!checkArithmeticBinOpPointerOperands(*this, Loc,
-                                               LHS.get(), RHS.get()))
-        return QualType();
-
-      // FIXME: Add warnings for nullptr - ptr.
-
-      // The pointee type may have zero size.  As an extension, a structure or
-      // union may have zero size or an array may have zero length.  In this
-      // case subtraction does not make sense.
-      if (!rpointee->isVoidType() && !rpointee->isFunctionType()) {
-        CharUnits ElementSize = Context.getTypeSizeInChars(rpointee);
-        if (ElementSize.isZero()) {
-          Diag(Loc,diag::warn_sub_ptr_zero_size_types)
-            << rpointee.getUnqualifiedType()
-            << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
-        }
-      }
-
-      if (CompLHSTy) *CompLHSTy = LHS.get()->getType();
-      return Context.getPointerDiffType();
-    }
-  }
-
-  return InvalidOperands(Loc, LHS, RHS);
-}
-
-static bool isScopedEnumerationType(QualType T) {
-  if (const EnumType *ET = T->getAs<EnumType>())
-    return ET->getDecl()->isScoped();
-  return false;
-}
-
-static void DiagnoseBadShiftValues(Sema& S, ExprResult &LHS, ExprResult &RHS,
-                                   SourceLocation Loc, BinaryOperatorKind Opc,
-                                   QualType LHSType) {
-  // OpenCL 6.3j: shift values are effectively % word size of LHS (more defined),
-  // so skip remaining warnings as we don't want to modify values within Sema.
-  if (S.getLangOpts().OpenCL)
-    return;
-
-  // Check right/shifter operand
-  Expr::EvalResult RHSResult;
-  if (RHS.get()->isValueDependent() ||
-      !RHS.get()->EvaluateAsInt(RHSResult, S.Context))
-    return;
-  llvm::APSInt Right = RHSResult.Val.getInt();
-
-  if (Right.isNegative()) {
-    S.DiagRuntimeBehavior(Loc, RHS.get(),
-                          S.PDiag(diag::warn_shift_negative)
-                            << RHS.get()->getSourceRange());
-    return;
-  }
-  llvm::APInt LeftBits(Right.getBitWidth(),
-                       S.Context.getTypeSize(LHS.get()->getType()));
-  if (Right.uge(LeftBits)) {
-    S.DiagRuntimeBehavior(Loc, RHS.get(),
-                          S.PDiag(diag::warn_shift_gt_typewidth)
-                            << RHS.get()->getSourceRange());
-    return;
-  }
-  if (Opc != BO_Shl)
-    return;
-
-  // When left shifting an ICE which is signed, we can check for overflow which
-  // according to C++ has undefined behavior ([expr.shift] 5.8/2). Unsigned
-  // integers have defined behavior modulo one more than the maximum value
-  // representable in the result type, so never warn for those.
-  Expr::EvalResult LHSResult;
-  if (LHS.get()->isValueDependent() ||
-      LHSType->hasUnsignedIntegerRepresentation() ||
-      !LHS.get()->EvaluateAsInt(LHSResult, S.Context))
-    return;
-  llvm::APSInt Left = LHSResult.Val.getInt();
-
-  // If LHS does not have a signed type and non-negative value
-  // then, the behavior is undefined. Warn about it.
-  if (Left.isNegative() && !S.getLangOpts().isSignedOverflowDefined()) {
-    S.DiagRuntimeBehavior(Loc, LHS.get(),
-                          S.PDiag(diag::warn_shift_lhs_negative)
-                            << LHS.get()->getSourceRange());
-    return;
-  }
-
-  llvm::APInt ResultBits =
-      static_cast<llvm::APInt&>(Right) + Left.getMinSignedBits();
-  if (LeftBits.uge(ResultBits))
-    return;
-  llvm::APSInt Result = Left.extend(ResultBits.getLimitedValue());
-  Result = Result.shl(Right);
-
-  // Print the bit representation of the signed integer as an unsigned
-  // hexadecimal number.
-  SmallString<40> HexResult;
-  Result.toString(HexResult, 16, /*Signed =*/false, /*Literal =*/true);
-
-  // If we are only missing a sign bit, this is less likely to result in actual
-  // bugs -- if the result is cast back to an unsigned type, it will have the
-  // expected value. Thus we place this behind a different warning that can be
-  // turned off separately if needed.
-  if (LeftBits == ResultBits - 1) {
-    S.Diag(Loc, diag::warn_shift_result_sets_sign_bit)
-        << HexResult << LHSType
-        << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
-    return;
-  }
-
-  S.Diag(Loc, diag::warn_shift_result_gt_typewidth)
-    << HexResult.str() << Result.getMinSignedBits() << LHSType
-    << Left.getBitWidth() << LHS.get()->getSourceRange()
-    << RHS.get()->getSourceRange();
-}
-
-/// Return the resulting type when a vector is shifted
-///        by a scalar or vector shift amount.
-static QualType checkVectorShift(Sema &S, ExprResult &LHS, ExprResult &RHS,
-                                 SourceLocation Loc, bool IsCompAssign) {
-  // OpenCL v1.1 s6.3.j says RHS can be a vector only if LHS is a vector.
-  if ((S.LangOpts.OpenCL || S.LangOpts.ZVector) &&
-      !LHS.get()->getType()->isVectorType()) {
-    S.Diag(Loc, diag::err_shift_rhs_only_vector)
-      << RHS.get()->getType() << LHS.get()->getType()
-      << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
-    return QualType();
-  }
-
-  if (!IsCompAssign) {
-    LHS = S.UsualUnaryConversions(LHS.get());
-    if (LHS.isInvalid()) return QualType();
-  }
-
-  RHS = S.UsualUnaryConversions(RHS.get());
-  if (RHS.isInvalid()) return QualType();
-
-  QualType LHSType = LHS.get()->getType();
-  // Note that LHS might be a scalar because the routine calls not only in
-  // OpenCL case.
-  const VectorType *LHSVecTy = LHSType->getAs<VectorType>();
-  QualType LHSEleType = LHSVecTy ? LHSVecTy->getElementType() : LHSType;
-
-  // Note that RHS might not be a vector.
-  QualType RHSType = RHS.get()->getType();
-  const VectorType *RHSVecTy = RHSType->getAs<VectorType>();
-  QualType RHSEleType = RHSVecTy ? RHSVecTy->getElementType() : RHSType;
-
-  // The operands need to be integers.
-  if (!LHSEleType->isIntegerType()) {
-    S.Diag(Loc, diag::err_typecheck_expect_int)
-      << LHS.get()->getType() << LHS.get()->getSourceRange();
-    return QualType();
-  }
-
-  if (!RHSEleType->isIntegerType()) {
-    S.Diag(Loc, diag::err_typecheck_expect_int)
-      << RHS.get()->getType() << RHS.get()->getSourceRange();
-    return QualType();
-  }
-
-  if (!LHSVecTy) {
-    assert(RHSVecTy);
-    if (IsCompAssign)
-      return RHSType;
-    if (LHSEleType != RHSEleType) {
-      LHS = S.ImpCastExprToType(LHS.get(),RHSEleType, CK_IntegralCast);
-      LHSEleType = RHSEleType;
-    }
-    QualType VecTy =
-        S.Context.getExtVectorType(LHSEleType, RHSVecTy->getNumElements());
-    LHS = S.ImpCastExprToType(LHS.get(), VecTy, CK_VectorSplat);
-    LHSType = VecTy;
-  } else if (RHSVecTy) {
-    // OpenCL v1.1 s6.3.j says that for vector types, the operators
-    // are applied component-wise. So if RHS is a vector, then ensure
-    // that the number of elements is the same as LHS...
-    if (RHSVecTy->getNumElements() != LHSVecTy->getNumElements()) {
-      S.Diag(Loc, diag::err_typecheck_vector_lengths_not_equal)
-        << LHS.get()->getType() << RHS.get()->getType()
-        << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
-      return QualType();
-    }
-    if (!S.LangOpts.OpenCL && !S.LangOpts.ZVector) {
-      const BuiltinType *LHSBT = LHSEleType->getAs<clang::BuiltinType>();
-      const BuiltinType *RHSBT = RHSEleType->getAs<clang::BuiltinType>();
-      if (LHSBT != RHSBT &&
-          S.Context.getTypeSize(LHSBT) != S.Context.getTypeSize(RHSBT)) {
-        S.Diag(Loc, diag::warn_typecheck_vector_element_sizes_not_equal)
-            << LHS.get()->getType() << RHS.get()->getType()
-            << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
-      }
-    }
-  } else {
-    // ...else expand RHS to match the number of elements in LHS.
-    QualType VecTy =
-      S.Context.getExtVectorType(RHSEleType, LHSVecTy->getNumElements());
-    RHS = S.ImpCastExprToType(RHS.get(), VecTy, CK_VectorSplat);
-  }
-
-  return LHSType;
-}
-
-// C99 6.5.7
-QualType Sema::CheckShiftOperands(ExprResult &LHS, ExprResult &RHS,
-                                  SourceLocation Loc, BinaryOperatorKind Opc,
-                                  bool IsCompAssign) {
-  checkArithmeticNull(*this, LHS, RHS, Loc, /*isCompare=*/false);
-
-  // Vector shifts promote their scalar inputs to vector type.
-  if (LHS.get()->getType()->isVectorType() ||
-      RHS.get()->getType()->isVectorType()) {
-    if (LangOpts.ZVector) {
-      // The shift operators for the z vector extensions work basically
-      // like general shifts, except that neither the LHS nor the RHS is
-      // allowed to be a "vector bool".
-      if (auto LHSVecType = LHS.get()->getType()->getAs<VectorType>())
-        if (LHSVecType->getVectorKind() == VectorType::AltiVecBool)
-          return InvalidOperands(Loc, LHS, RHS);
-      if (auto RHSVecType = RHS.get()->getType()->getAs<VectorType>())
-        if (RHSVecType->getVectorKind() == VectorType::AltiVecBool)
-          return InvalidOperands(Loc, LHS, RHS);
-    }
-    return checkVectorShift(*this, LHS, RHS, Loc, IsCompAssign);
-  }
-
-  // Shifts don't perform usual arithmetic conversions, they just do integer
-  // promotions on each operand. C99 6.5.7p3
-
-  // For the LHS, do usual unary conversions, but then reset them away
-  // if this is a compound assignment.
-  ExprResult OldLHS = LHS;
-  LHS = UsualUnaryConversions(LHS.get());
-  if (LHS.isInvalid())
-    return QualType();
-  QualType LHSType = LHS.get()->getType();
-  if (IsCompAssign) LHS = OldLHS;
-
-  // The RHS is simpler.
-  RHS = UsualUnaryConversions(RHS.get());
-  if (RHS.isInvalid())
-    return QualType();
-  QualType RHSType = RHS.get()->getType();
-
-  // C99 6.5.7p2: Each of the operands shall have integer type.
-  if (!LHSType->hasIntegerRepresentation() ||
-      !RHSType->hasIntegerRepresentation())
-    return InvalidOperands(Loc, LHS, RHS);
-
-  // C++0x: Don't allow scoped enums. FIXME: Use something better than
-  // hasIntegerRepresentation() above instead of this.
-  if (isScopedEnumerationType(LHSType) ||
-      isScopedEnumerationType(RHSType)) {
-    return InvalidOperands(Loc, LHS, RHS);
-  }
-  // Sanity-check shift operands
-  DiagnoseBadShiftValues(*this, LHS, RHS, Loc, Opc, LHSType);
-
-  // "The type of the result is that of the promoted left operand."
-  return LHSType;
-}
-
-/// If two different enums are compared, raise a warning.
-static void checkEnumComparison(Sema &S, SourceLocation Loc, Expr *LHS,
-                                Expr *RHS) {
-  QualType LHSStrippedType = LHS->IgnoreParenImpCasts()->getType();
-  QualType RHSStrippedType = RHS->IgnoreParenImpCasts()->getType();
-
-  const EnumType *LHSEnumType = LHSStrippedType->getAs<EnumType>();
-  if (!LHSEnumType)
-    return;
-  const EnumType *RHSEnumType = RHSStrippedType->getAs<EnumType>();
-  if (!RHSEnumType)
-    return;
-
-  // Ignore anonymous enums.
-  if (!LHSEnumType->getDecl()->getIdentifier() &&
-      !LHSEnumType->getDecl()->getTypedefNameForAnonDecl())
-    return;
-  if (!RHSEnumType->getDecl()->getIdentifier() &&
-      !RHSEnumType->getDecl()->getTypedefNameForAnonDecl())
-    return;
-
-  if (S.Context.hasSameUnqualifiedType(LHSStrippedType, RHSStrippedType))
-    return;
-
-  S.Diag(Loc, diag::warn_comparison_of_mixed_enum_types)
-      << LHSStrippedType << RHSStrippedType
-      << LHS->getSourceRange() << RHS->getSourceRange();
-}
-
-/// Diagnose bad pointer comparisons.
-static void diagnoseDistinctPointerComparison(Sema &S, SourceLocation Loc,
-                                              ExprResult &LHS, ExprResult &RHS,
-                                              bool IsError) {
-  S.Diag(Loc, IsError ? diag::err_typecheck_comparison_of_distinct_pointers
-                      : diag::ext_typecheck_comparison_of_distinct_pointers)
-    << LHS.get()->getType() << RHS.get()->getType()
-    << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
-}
-
-/// Returns false if the pointers are converted to a composite type,
-/// true otherwise.
-static bool convertPointersToCompositeType(Sema &S, SourceLocation Loc,
-                                           ExprResult &LHS, ExprResult &RHS) {
-  // C++ [expr.rel]p2:
-  //   [...] Pointer conversions (4.10) and qualification
-  //   conversions (4.4) are performed on pointer operands (or on
-  //   a pointer operand and a null pointer constant) to bring
-  //   them to their composite pointer type. [...]
-  //
-  // C++ [expr.eq]p1 uses the same notion for (in)equality
-  // comparisons of pointers.
-
-  QualType LHSType = LHS.get()->getType();
-  QualType RHSType = RHS.get()->getType();
-  assert(LHSType->isPointerType() || RHSType->isPointerType() ||
-         LHSType->isMemberPointerType() || RHSType->isMemberPointerType());
-
-  QualType T = S.FindCompositePointerType(Loc, LHS, RHS);
-  if (T.isNull()) {
-    if ((LHSType->isPointerType() || LHSType->isMemberPointerType()) &&
-        (RHSType->isPointerType() || RHSType->isMemberPointerType()))
-      diagnoseDistinctPointerComparison(S, Loc, LHS, RHS, /*isError*/true);
-    else
-      S.InvalidOperands(Loc, LHS, RHS);
-    return true;
-  }
-
-  LHS = S.ImpCastExprToType(LHS.get(), T, CK_BitCast);
-  RHS = S.ImpCastExprToType(RHS.get(), T, CK_BitCast);
-  return false;
-}
-
-static void diagnoseFunctionPointerToVoidComparison(Sema &S, SourceLocation Loc,
-                                                    ExprResult &LHS,
-                                                    ExprResult &RHS,
-                                                    bool IsError) {
-  S.Diag(Loc, IsError ? diag::err_typecheck_comparison_of_fptr_to_void
-                      : diag::ext_typecheck_comparison_of_fptr_to_void)
-    << LHS.get()->getType() << RHS.get()->getType()
-    << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
-}
-
-static bool isObjCObjectLiteral(ExprResult &E) {
-  switch (E.get()->IgnoreParenImpCasts()->getStmtClass()) {
-  case Stmt::ObjCArrayLiteralClass:
-  case Stmt::ObjCDictionaryLiteralClass:
-  case Stmt::ObjCStringLiteralClass:
-  case Stmt::ObjCBoxedExprClass:
-    return true;
-  default:
-    // Note that ObjCBoolLiteral is NOT an object literal!
-    return false;
-  }
-}
-
-static bool hasIsEqualMethod(Sema &S, const Expr *LHS, const Expr *RHS) {
-  const ObjCObjectPointerType *Type =
-    LHS->getType()->getAs<ObjCObjectPointerType>();
-
-  // If this is not actually an Objective-C object, bail out.
-  if (!Type)
-    return false;
-
-  // Get the LHS object's interface type.
-  QualType InterfaceType = Type->getPointeeType();
-
-  // If the RHS isn't an Objective-C object, bail out.
-  if (!RHS->getType()->isObjCObjectPointerType())
-    return false;
-
-  // Try to find the -isEqual: method.
-  Selector IsEqualSel = S.NSAPIObj->getIsEqualSelector();
-  ObjCMethodDecl *Method = S.LookupMethodInObjectType(IsEqualSel,
-                                                      InterfaceType,
-                                                      /*instance=*/true);
-  if (!Method) {
-    if (Type->isObjCIdType()) {
-      // For 'id', just check the global pool.
-      Method = S.LookupInstanceMethodInGlobalPool(IsEqualSel, SourceRange(),
-                                                  /*receiverId=*/true);
-    } else {
-      // Check protocols.
-      Method = S.LookupMethodInQualifiedType(IsEqualSel, Type,
-                                             /*instance=*/true);
-    }
-  }
-
-  if (!Method)
-    return false;
-
-  QualType T = Method->parameters()[0]->getType();
-  if (!T->isObjCObjectPointerType())
-    return false;
-
-  QualType R = Method->getReturnType();
-  if (!R->isScalarType())
-    return false;
-
-  return true;
-}
-
-Sema::ObjCLiteralKind Sema::CheckLiteralKind(Expr *FromE) {
-  FromE = FromE->IgnoreParenImpCasts();
-  switch (FromE->getStmtClass()) {
-    default:
-      break;
-    case Stmt::ObjCStringLiteralClass:
-      // "string literal"
-      return LK_String;
-    case Stmt::ObjCArrayLiteralClass:
-      // "array literal"
-      return LK_Array;
-    case Stmt::ObjCDictionaryLiteralClass:
-      // "dictionary literal"
-      return LK_Dictionary;
-    case Stmt::BlockExprClass:
-      return LK_Block;
-    case Stmt::ObjCBoxedExprClass: {
-      Expr *Inner = cast<ObjCBoxedExpr>(FromE)->getSubExpr()->IgnoreParens();
-      switch (Inner->getStmtClass()) {
-        case Stmt::IntegerLiteralClass:
-        case Stmt::FloatingLiteralClass:
-        case Stmt::CharacterLiteralClass:
-        case Stmt::ObjCBoolLiteralExprClass:
-        case Stmt::CXXBoolLiteralExprClass:
-          // "numeric literal"
-          return LK_Numeric;
-        case Stmt::ImplicitCastExprClass: {
-          CastKind CK = cast<CastExpr>(Inner)->getCastKind();
-          // Boolean literals can be represented by implicit casts.
-          if (CK == CK_IntegralToBoolean || CK == CK_IntegralCast)
-            return LK_Numeric;
-          break;
-        }
-        default:
-          break;
-      }
-      return LK_Boxed;
-    }
-  }
-  return LK_None;
-}
-
-static void diagnoseObjCLiteralComparison(Sema &S, SourceLocation Loc,
-                                          ExprResult &LHS, ExprResult &RHS,
-                                          BinaryOperator::Opcode Opc){
-  Expr *Literal;
-  Expr *Other;
-  if (isObjCObjectLiteral(LHS)) {
-    Literal = LHS.get();
-    Other = RHS.get();
-  } else {
-    Literal = RHS.get();
-    Other = LHS.get();
-  }
-
-  // Don't warn on comparisons against nil.
-  Other = Other->IgnoreParenCasts();
-  if (Other->isNullPointerConstant(S.getASTContext(),
-                                   Expr::NPC_ValueDependentIsNotNull))
-    return;
-
-  // This should be kept in sync with warn_objc_literal_comparison.
-  // LK_String should always be after the other literals, since it has its own
-  // warning flag.
-  Sema::ObjCLiteralKind LiteralKind = S.CheckLiteralKind(Literal);
-  assert(LiteralKind != Sema::LK_Block);
-  if (LiteralKind == Sema::LK_None) {
-    llvm_unreachable("Unknown Objective-C object literal kind");
-  }
-
-  if (LiteralKind == Sema::LK_String)
-    S.Diag(Loc, diag::warn_objc_string_literal_comparison)
-      << Literal->getSourceRange();
-  else
-    S.Diag(Loc, diag::warn_objc_literal_comparison)
-      << LiteralKind << Literal->getSourceRange();
-
-  if (BinaryOperator::isEqualityOp(Opc) &&
-      hasIsEqualMethod(S, LHS.get(), RHS.get())) {
-    SourceLocation Start = LHS.get()->getBeginLoc();
-    SourceLocation End = S.getLocForEndOfToken(RHS.get()->getEndLoc());
-    CharSourceRange OpRange =
-      CharSourceRange::getCharRange(Loc, S.getLocForEndOfToken(Loc));
-
-    S.Diag(Loc, diag::note_objc_literal_comparison_isequal)
-      << FixItHint::CreateInsertion(Start, Opc == BO_EQ ? "[" : "![")
-      << FixItHint::CreateReplacement(OpRange, " isEqual:")
-      << FixItHint::CreateInsertion(End, "]");
-  }
-}
-
-/// Warns on !x < y, !x & y where !(x < y), !(x & y) was probably intended.
-static void diagnoseLogicalNotOnLHSofCheck(Sema &S, ExprResult &LHS,
-                                           ExprResult &RHS, SourceLocation Loc,
-                                           BinaryOperatorKind Opc) {
-  // Check that left hand side is !something.
-  UnaryOperator *UO = dyn_cast<UnaryOperator>(LHS.get()->IgnoreImpCasts());
-  if (!UO || UO->getOpcode() != UO_LNot) return;
-
-  // Only check if the right hand side is non-bool arithmetic type.
-  if (RHS.get()->isKnownToHaveBooleanValue()) return;
-
-  // Make sure that the something in !something is not bool.
-  Expr *SubExpr = UO->getSubExpr()->IgnoreImpCasts();
-  if (SubExpr->isKnownToHaveBooleanValue()) return;
-
-  // Emit warning.
-  bool IsBitwiseOp = Opc == BO_And || Opc == BO_Or || Opc == BO_Xor;
-  S.Diag(UO->getOperatorLoc(), diag::warn_logical_not_on_lhs_of_check)
-      << Loc << IsBitwiseOp;
-
-  // First note suggest !(x < y)
-  SourceLocation FirstOpen = SubExpr->getBeginLoc();
-  SourceLocation FirstClose = RHS.get()->getEndLoc();
-  FirstClose = S.getLocForEndOfToken(FirstClose);
-  if (FirstClose.isInvalid())
-    FirstOpen = SourceLocation();
-  S.Diag(UO->getOperatorLoc(), diag::note_logical_not_fix)
-      << IsBitwiseOp
-      << FixItHint::CreateInsertion(FirstOpen, "(")
-      << FixItHint::CreateInsertion(FirstClose, ")");
-
-  // Second note suggests (!x) < y
-  SourceLocation SecondOpen = LHS.get()->getBeginLoc();
-  SourceLocation SecondClose = LHS.get()->getEndLoc();
-  SecondClose = S.getLocForEndOfToken(SecondClose);
-  if (SecondClose.isInvalid())
-    SecondOpen = SourceLocation();
-  S.Diag(UO->getOperatorLoc(), diag::note_logical_not_silence_with_parens)
-      << FixItHint::CreateInsertion(SecondOpen, "(")
-      << FixItHint::CreateInsertion(SecondClose, ")");
-}
-
-// Get the decl for a simple expression: a reference to a variable,
-// an implicit C++ field reference, or an implicit ObjC ivar reference.
-static ValueDecl *getCompareDecl(Expr *E) {
-  if (DeclRefExpr *DR = dyn_cast<DeclRefExpr>(E))
-    return DR->getDecl();
-  if (ObjCIvarRefExpr *Ivar = dyn_cast<ObjCIvarRefExpr>(E)) {
-    if (Ivar->isFreeIvar())
-      return Ivar->getDecl();
-  }
-  if (MemberExpr *Mem = dyn_cast<MemberExpr>(E)) {
-    if (Mem->isImplicitAccess())
-      return Mem->getMemberDecl();
-  }
-  return nullptr;
-}
-
-/// Diagnose some forms of syntactically-obvious tautological comparison.
-static void diagnoseTautologicalComparison(Sema &S, SourceLocation Loc,
-                                           Expr *LHS, Expr *RHS,
-                                           BinaryOperatorKind Opc) {
-  Expr *LHSStripped = LHS->IgnoreParenImpCasts();
-  Expr *RHSStripped = RHS->IgnoreParenImpCasts();
-
-  QualType LHSType = LHS->getType();
-  QualType RHSType = RHS->getType();
-  if (LHSType->hasFloatingRepresentation() ||
-      (LHSType->isBlockPointerType() && !BinaryOperator::isEqualityOp(Opc)) ||
-      LHS->getBeginLoc().isMacroID() || RHS->getBeginLoc().isMacroID() ||
-      S.inTemplateInstantiation())
-    return;
-
-  // Comparisons between two array types are ill-formed for operator<=>, so
-  // we shouldn't emit any additional warnings about it.
-  if (Opc == BO_Cmp && LHSType->isArrayType() && RHSType->isArrayType())
-    return;
-
-  // For non-floating point types, check for self-comparisons of the form
-  // x == x, x != x, x < x, etc.  These always evaluate to a constant, and
-  // often indicate logic errors in the program.
-  //
-  // NOTE: Don't warn about comparison expressions resulting from macro
-  // expansion. Also don't warn about comparisons which are only self
-  // comparisons within a template instantiation. The warnings should catch
-  // obvious cases in the definition of the template anyways. The idea is to
-  // warn when the typed comparison operator will always evaluate to the same
-  // result.
-  ValueDecl *DL = getCompareDecl(LHSStripped);
-  ValueDecl *DR = getCompareDecl(RHSStripped);
-  if (DL && DR && declaresSameEntity(DL, DR)) {
-    StringRef Result;
-    switch (Opc) {
-    case BO_EQ: case BO_LE: case BO_GE:
-      Result = "true";
-      break;
-    case BO_NE: case BO_LT: case BO_GT:
-      Result = "false";
-      break;
-    case BO_Cmp:
-      Result = "'std::strong_ordering::equal'";
-      break;
-    default:
-      break;
-    }
-    S.DiagRuntimeBehavior(Loc, nullptr,
-                          S.PDiag(diag::warn_comparison_always)
-                              << 0 /*self-comparison*/ << !Result.empty()
-                              << Result);
-  } else if (DL && DR &&
-             DL->getType()->isArrayType() && DR->getType()->isArrayType() &&
-             !DL->isWeak() && !DR->isWeak()) {
-    // What is it always going to evaluate to?
-    StringRef Result;
-    switch(Opc) {
-    case BO_EQ: // e.g. array1 == array2
-      Result = "false";
-      break;
-    case BO_NE: // e.g. array1 != array2
-      Result = "true";
-      break;
-    default: // e.g. array1 <= array2
-      // The best we can say is 'a constant'
-      break;
-    }
-    S.DiagRuntimeBehavior(Loc, nullptr,
-                          S.PDiag(diag::warn_comparison_always)
-                              << 1 /*array comparison*/
-                              << !Result.empty() << Result);
-  }
-
-  if (isa<CastExpr>(LHSStripped))
-    LHSStripped = LHSStripped->IgnoreParenCasts();
-  if (isa<CastExpr>(RHSStripped))
-    RHSStripped = RHSStripped->IgnoreParenCasts();
-
-  // Warn about comparisons against a string constant (unless the other
-  // operand is null); the user probably wants strcmp.
-  Expr *LiteralString = nullptr;
-  Expr *LiteralStringStripped = nullptr;
-  if ((isa<StringLiteral>(LHSStripped) || isa<ObjCEncodeExpr>(LHSStripped)) &&
-      !RHSStripped->isNullPointerConstant(S.Context,
-                                          Expr::NPC_ValueDependentIsNull)) {
-    LiteralString = LHS;
-    LiteralStringStripped = LHSStripped;
-  } else if ((isa<StringLiteral>(RHSStripped) ||
-              isa<ObjCEncodeExpr>(RHSStripped)) &&
-             !LHSStripped->isNullPointerConstant(S.Context,
-                                          Expr::NPC_ValueDependentIsNull)) {
-    LiteralString = RHS;
-    LiteralStringStripped = RHSStripped;
-  }
-
-  if (LiteralString) {
-    S.DiagRuntimeBehavior(Loc, nullptr,
-                          S.PDiag(diag::warn_stringcompare)
-                              << isa<ObjCEncodeExpr>(LiteralStringStripped)
-                              << LiteralString->getSourceRange());
-  }
-}
-
-static ImplicitConversionKind castKindToImplicitConversionKind(CastKind CK) {
-  switch (CK) {
-  default: {
-#ifndef NDEBUG
-    llvm::errs() << "unhandled cast kind: " << CastExpr::getCastKindName(CK)
-                 << "\n";
-#endif
-    llvm_unreachable("unhandled cast kind");
-  }
-  case CK_UserDefinedConversion:
-    return ICK_Identity;
-  case CK_LValueToRValue:
-    return ICK_Lvalue_To_Rvalue;
-  case CK_ArrayToPointerDecay:
-    return ICK_Array_To_Pointer;
-  case CK_FunctionToPointerDecay:
-    return ICK_Function_To_Pointer;
-  case CK_IntegralCast:
-    return ICK_Integral_Conversion;
-  case CK_FloatingCast:
-    return ICK_Floating_Conversion;
-  case CK_IntegralToFloating:
-  case CK_FloatingToIntegral:
-    return ICK_Floating_Integral;
-  case CK_IntegralComplexCast:
-  case CK_FloatingComplexCast:
-  case CK_FloatingComplexToIntegralComplex:
-  case CK_IntegralComplexToFloatingComplex:
-    return ICK_Complex_Conversion;
-  case CK_FloatingComplexToReal:
-  case CK_FloatingRealToComplex:
-  case CK_IntegralComplexToReal:
-  case CK_IntegralRealToComplex:
-    return ICK_Complex_Real;
-  }
-}
-
-static bool checkThreeWayNarrowingConversion(Sema &S, QualType ToType, Expr *E,
-                                             QualType FromType,
-                                             SourceLocation Loc) {
-  // Check for a narrowing implicit conversion.
-  StandardConversionSequence SCS;
-  SCS.setAsIdentityConversion();
-  SCS.setToType(0, FromType);
-  SCS.setToType(1, ToType);
-  if (const auto *ICE = dyn_cast<ImplicitCastExpr>(E))
-    SCS.Second = castKindToImplicitConversionKind(ICE->getCastKind());
-
-  APValue PreNarrowingValue;
-  QualType PreNarrowingType;
-  switch (SCS.getNarrowingKind(S.Context, E, PreNarrowingValue,
-                               PreNarrowingType,
-                               /*IgnoreFloatToIntegralConversion*/ true)) {
-  case NK_Dependent_Narrowing:
-    // Implicit conversion to a narrower type, but the expression is
-    // value-dependent so we can't tell whether it's actually narrowing.
-  case NK_Not_Narrowing:
-    return false;
-
-  case NK_Constant_Narrowing:
-    // Implicit conversion to a narrower type, and the value is not a constant
-    // expression.
-    S.Diag(E->getBeginLoc(), diag::err_spaceship_argument_narrowing)
-        << /*Constant*/ 1
-        << PreNarrowingValue.getAsString(S.Context, PreNarrowingType) << ToType;
-    return true;
-
-  case NK_Variable_Narrowing:
-    // Implicit conversion to a narrower type, and the value is not a constant
-    // expression.
-  case NK_Type_Narrowing:
-    S.Diag(E->getBeginLoc(), diag::err_spaceship_argument_narrowing)
-        << /*Constant*/ 0 << FromType << ToType;
-    // TODO: It's not a constant expression, but what if the user intended it
-    // to be? Can we produce notes to help them figure out why it isn't?
-    return true;
-  }
-  llvm_unreachable("unhandled case in switch");
-}
-
-static QualType checkArithmeticOrEnumeralThreeWayCompare(Sema &S,
-                                                         ExprResult &LHS,
-                                                         ExprResult &RHS,
-                                                         SourceLocation Loc) {
-  using CCT = ComparisonCategoryType;
-
-  QualType LHSType = LHS.get()->getType();
-  QualType RHSType = RHS.get()->getType();
-  // Dig out the original argument type and expression before implicit casts
-  // were applied. These are the types/expressions we need to check the
-  // [expr.spaceship] requirements against.
-  ExprResult LHSStripped = LHS.get()->IgnoreParenImpCasts();
-  ExprResult RHSStripped = RHS.get()->IgnoreParenImpCasts();
-  QualType LHSStrippedType = LHSStripped.get()->getType();
-  QualType RHSStrippedType = RHSStripped.get()->getType();
-
-  // C++2a [expr.spaceship]p3: If one of the operands is of type bool and the
-  // other is not, the program is ill-formed.
-  if (LHSStrippedType->isBooleanType() != RHSStrippedType->isBooleanType()) {
-    S.InvalidOperands(Loc, LHSStripped, RHSStripped);
-    return QualType();
-  }
-
-  int NumEnumArgs = (int)LHSStrippedType->isEnumeralType() +
-                    RHSStrippedType->isEnumeralType();
-  if (NumEnumArgs == 1) {
-    bool LHSIsEnum = LHSStrippedType->isEnumeralType();
-    QualType OtherTy = LHSIsEnum ? RHSStrippedType : LHSStrippedType;
-    if (OtherTy->hasFloatingRepresentation()) {
-      S.InvalidOperands(Loc, LHSStripped, RHSStripped);
-      return QualType();
-    }
-  }
-  if (NumEnumArgs == 2) {
-    // C++2a [expr.spaceship]p5: If both operands have the same enumeration
-    // type E, the operator yields the result of converting the operands
-    // to the underlying type of E and applying <=> to the converted operands.
-    if (!S.Context.hasSameUnqualifiedType(LHSStrippedType, RHSStrippedType)) {
-      S.InvalidOperands(Loc, LHS, RHS);
-      return QualType();
-    }
-    QualType IntType =
-        LHSStrippedType->getAs<EnumType>()->getDecl()->getIntegerType();
-    assert(IntType->isArithmeticType());
-
-    // We can't use `CK_IntegralCast` when the underlying type is 'bool', so we
-    // promote the boolean type, and all other promotable integer types, to
-    // avoid this.
-    if (IntType->isPromotableIntegerType())
-      IntType = S.Context.getPromotedIntegerType(IntType);
-
-    LHS = S.ImpCastExprToType(LHS.get(), IntType, CK_IntegralCast);
-    RHS = S.ImpCastExprToType(RHS.get(), IntType, CK_IntegralCast);
-    LHSType = RHSType = IntType;
-  }
-
-  // C++2a [expr.spaceship]p4: If both operands have arithmetic types, the
-  // usual arithmetic conversions are applied to the operands.
-  QualType Type = S.UsualArithmeticConversions(LHS, RHS);
-  if (LHS.isInvalid() || RHS.isInvalid())
-    return QualType();
-  if (Type.isNull())
-    return S.InvalidOperands(Loc, LHS, RHS);
-  assert(Type->isArithmeticType() || Type->isEnumeralType());
-
-  bool HasNarrowing = checkThreeWayNarrowingConversion(
-      S, Type, LHS.get(), LHSType, LHS.get()->getBeginLoc());
-  HasNarrowing |= checkThreeWayNarrowingConversion(S, Type, RHS.get(), RHSType,
-                                                   RHS.get()->getBeginLoc());
-  if (HasNarrowing)
-    return QualType();
-
-  assert(!Type.isNull() && "composite type for <=> has not been set");
-
-  auto TypeKind = [&]() {
-    if (const ComplexType *CT = Type->getAs<ComplexType>()) {
-      if (CT->getElementType()->hasFloatingRepresentation())
-        return CCT::WeakEquality;
-      return CCT::StrongEquality;
-    }
-    if (Type->isIntegralOrEnumerationType())
-      return CCT::StrongOrdering;
-    if (Type->hasFloatingRepresentation())
-      return CCT::PartialOrdering;
-    llvm_unreachable("other types are unimplemented");
-  }();
-
-  return S.CheckComparisonCategoryType(TypeKind, Loc);
-}
-
-static QualType checkArithmeticOrEnumeralCompare(Sema &S, ExprResult &LHS,
-                                                 ExprResult &RHS,
-                                                 SourceLocation Loc,
-                                                 BinaryOperatorKind Opc) {
-  if (Opc == BO_Cmp)
-    return checkArithmeticOrEnumeralThreeWayCompare(S, LHS, RHS, Loc);
-
-  // C99 6.5.8p3 / C99 6.5.9p4
-  QualType Type = S.UsualArithmeticConversions(LHS, RHS);
-  if (LHS.isInvalid() || RHS.isInvalid())
-    return QualType();
-  if (Type.isNull())
-    return S.InvalidOperands(Loc, LHS, RHS);
-  assert(Type->isArithmeticType() || Type->isEnumeralType());
-
-  checkEnumComparison(S, Loc, LHS.get(), RHS.get());
-
-  if (Type->isAnyComplexType() && BinaryOperator::isRelationalOp(Opc))
-    return S.InvalidOperands(Loc, LHS, RHS);
-
-  // Check for comparisons of floating point operands using != and ==.
-  if (Type->hasFloatingRepresentation() && BinaryOperator::isEqualityOp(Opc))
-    S.CheckFloatComparison(Loc, LHS.get(), RHS.get());
-
-  // The result of comparisons is 'bool' in C++, 'int' in C.
-  return S.Context.getLogicalOperationType();
-}
-
-// C99 6.5.8, C++ [expr.rel]
-QualType Sema::CheckCompareOperands(ExprResult &LHS, ExprResult &RHS,
-                                    SourceLocation Loc,
-                                    BinaryOperatorKind Opc) {
-  bool IsRelational = BinaryOperator::isRelationalOp(Opc);
-  bool IsThreeWay = Opc == BO_Cmp;
-  auto IsAnyPointerType = [](ExprResult E) {
-    QualType Ty = E.get()->getType();
-    return Ty->isPointerType() || Ty->isMemberPointerType();
-  };
-
-  // C++2a [expr.spaceship]p6: If at least one of the operands is of pointer
-  // type, array-to-pointer, ..., conversions are performed on both operands to
-  // bring them to their composite type.
-  // Otherwise, all comparisons expect an rvalue, so convert to rvalue before
-  // any type-related checks.
-  if (!IsThreeWay || IsAnyPointerType(LHS) || IsAnyPointerType(RHS)) {
-    LHS = DefaultFunctionArrayLvalueConversion(LHS.get());
-    if (LHS.isInvalid())
-      return QualType();
-    RHS = DefaultFunctionArrayLvalueConversion(RHS.get());
-    if (RHS.isInvalid())
-      return QualType();
-  } else {
-    LHS = DefaultLvalueConversion(LHS.get());
-    if (LHS.isInvalid())
-      return QualType();
-    RHS = DefaultLvalueConversion(RHS.get());
-    if (RHS.isInvalid())
-      return QualType();
-  }
-
-  checkArithmeticNull(*this, LHS, RHS, Loc, /*isCompare=*/true);
-
-  // Handle vector comparisons separately.
-  if (LHS.get()->getType()->isVectorType() ||
-      RHS.get()->getType()->isVectorType())
-    return CheckVectorCompareOperands(LHS, RHS, Loc, Opc);
-
-  diagnoseLogicalNotOnLHSofCheck(*this, LHS, RHS, Loc, Opc);
-  diagnoseTautologicalComparison(*this, Loc, LHS.get(), RHS.get(), Opc);
-
-  QualType LHSType = LHS.get()->getType();
-  QualType RHSType = RHS.get()->getType();
-  if ((LHSType->isArithmeticType() || LHSType->isEnumeralType()) &&
-      (RHSType->isArithmeticType() || RHSType->isEnumeralType()))
-    return checkArithmeticOrEnumeralCompare(*this, LHS, RHS, Loc, Opc);
-
-  const Expr::NullPointerConstantKind LHSNullKind =
-      LHS.get()->isNullPointerConstant(Context, Expr::NPC_ValueDependentIsNull);
-  const Expr::NullPointerConstantKind RHSNullKind =
-      RHS.get()->isNullPointerConstant(Context, Expr::NPC_ValueDependentIsNull);
-  bool LHSIsNull = LHSNullKind != Expr::NPCK_NotNull;
-  bool RHSIsNull = RHSNullKind != Expr::NPCK_NotNull;
-
-  auto computeResultTy = [&]() {
-    if (Opc != BO_Cmp)
-      return Context.getLogicalOperationType();
-    assert(getLangOpts().CPlusPlus);
-    assert(Context.hasSameType(LHS.get()->getType(), RHS.get()->getType()));
-
-    QualType CompositeTy = LHS.get()->getType();
-    assert(!CompositeTy->isReferenceType());
-
-    auto buildResultTy = [&](ComparisonCategoryType Kind) {
-      return CheckComparisonCategoryType(Kind, Loc);
-    };
-
-    // C++2a [expr.spaceship]p7: If the composite pointer type is a function
-    // pointer type, a pointer-to-member type, or std::nullptr_t, the
-    // result is of type std::strong_equality
-    if (CompositeTy->isFunctionPointerType() ||
-        CompositeTy->isMemberPointerType() || CompositeTy->isNullPtrType())
-      // FIXME: consider making the function pointer case produce
-      // strong_ordering not strong_equality, per P0946R0-Jax18 discussion
-      // and direction polls
-      return buildResultTy(ComparisonCategoryType::StrongEquality);
-
-    // C++2a [expr.spaceship]p8: If the composite pointer type is an object
-    // pointer type, p <=> q is of type std::strong_ordering.
-    if (CompositeTy->isPointerType()) {
-      // P0946R0: Comparisons between a null pointer constant and an object
-      // pointer result in std::strong_equality
-      if (LHSIsNull != RHSIsNull)
-        return buildResultTy(ComparisonCategoryType::StrongEquality);
-      return buildResultTy(ComparisonCategoryType::StrongOrdering);
-    }
-    // C++2a [expr.spaceship]p9: Otherwise, the program is ill-formed.
-    // TODO: Extend support for operator<=> to ObjC types.
-    return InvalidOperands(Loc, LHS, RHS);
-  };
-
-
-  if (!IsRelational && LHSIsNull != RHSIsNull) {
-    bool IsEquality = Opc == BO_EQ;
-    if (RHSIsNull)
-      DiagnoseAlwaysNonNullPointer(LHS.get(), RHSNullKind, IsEquality,
-                                   RHS.get()->getSourceRange());
-    else
-      DiagnoseAlwaysNonNullPointer(RHS.get(), LHSNullKind, IsEquality,
-                                   LHS.get()->getSourceRange());
-  }
-
-  if ((LHSType->isIntegerType() && !LHSIsNull) ||
-      (RHSType->isIntegerType() && !RHSIsNull)) {
-    // Skip normal pointer conversion checks in this case; we have better
-    // diagnostics for this below.
-  } else if (getLangOpts().CPlusPlus) {
-    // Equality comparison of a function pointer to a void pointer is invalid,
-    // but we allow it as an extension.
-    // FIXME: If we really want to allow this, should it be part of composite
-    // pointer type computation so it works in conditionals too?
-    if (!IsRelational &&
-        ((LHSType->isFunctionPointerType() && RHSType->isVoidPointerType()) ||
-         (RHSType->isFunctionPointerType() && LHSType->isVoidPointerType()))) {
-      // This is a gcc extension compatibility comparison.
-      // In a SFINAE context, we treat this as a hard error to maintain
-      // conformance with the C++ standard.
-      diagnoseFunctionPointerToVoidComparison(
-          *this, Loc, LHS, RHS, /*isError*/ (bool)isSFINAEContext());
-
-      if (isSFINAEContext())
-        return QualType();
-
-      RHS = ImpCastExprToType(RHS.get(), LHSType, CK_BitCast);
-      return computeResultTy();
-    }
-
-    // C++ [expr.eq]p2:
-    //   If at least one operand is a pointer [...] bring them to their
-    //   composite pointer type.
-    // C++ [expr.spaceship]p6
-    //  If at least one of the operands is of pointer type, [...] bring them
-    //  to their composite pointer type.
-    // C++ [expr.rel]p2:
-    //   If both operands are pointers, [...] bring them to their composite
-    //   pointer type.
-    if ((int)LHSType->isPointerType() + (int)RHSType->isPointerType() >=
-            (IsRelational ? 2 : 1) &&
-        (!LangOpts.ObjCAutoRefCount || !(LHSType->isObjCObjectPointerType() ||
-                                         RHSType->isObjCObjectPointerType()))) {
-      if (convertPointersToCompositeType(*this, Loc, LHS, RHS))
-        return QualType();
-      return computeResultTy();
-    }
-  } else if (LHSType->isPointerType() &&
-             RHSType->isPointerType()) { // C99 6.5.8p2
-    // All of the following pointer-related warnings are GCC extensions, except
-    // when handling null pointer constants.
-    QualType LCanPointeeTy =
-      LHSType->castAs<PointerType>()->getPointeeType().getCanonicalType();
-    QualType RCanPointeeTy =
-      RHSType->castAs<PointerType>()->getPointeeType().getCanonicalType();
-
-    // C99 6.5.9p2 and C99 6.5.8p2
-    if (Context.typesAreCompatible(LCanPointeeTy.getUnqualifiedType(),
-                                   RCanPointeeTy.getUnqualifiedType())) {
-      // Valid unless a relational comparison of function pointers
-      if (IsRelational && LCanPointeeTy->isFunctionType()) {
-        Diag(Loc, diag::ext_typecheck_ordered_comparison_of_function_pointers)
-          << LHSType << RHSType << LHS.get()->getSourceRange()
-          << RHS.get()->getSourceRange();
-      }
-    } else if (!IsRelational &&
-               (LCanPointeeTy->isVoidType() || RCanPointeeTy->isVoidType())) {
-      // Valid unless comparison between non-null pointer and function pointer
-      if ((LCanPointeeTy->isFunctionType() || RCanPointeeTy->isFunctionType())
-          && !LHSIsNull && !RHSIsNull)
-        diagnoseFunctionPointerToVoidComparison(*this, Loc, LHS, RHS,
-                                                /*isError*/false);
-    } else {
-      // Invalid
-      diagnoseDistinctPointerComparison(*this, Loc, LHS, RHS, /*isError*/false);
-    }
-    if (LCanPointeeTy != RCanPointeeTy) {
-      // Treat NULL constant as a special case in OpenCL.
-      if (getLangOpts().OpenCL && !LHSIsNull && !RHSIsNull) {
-        const PointerType *LHSPtr = LHSType->getAs<PointerType>();
-        if (!LHSPtr->isAddressSpaceOverlapping(*RHSType->getAs<PointerType>())) {
-          Diag(Loc,
-               diag::err_typecheck_op_on_nonoverlapping_address_space_pointers)
-              << LHSType << RHSType << 0 /* comparison */
-              << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
-        }
-      }
-      LangAS AddrSpaceL = LCanPointeeTy.getAddressSpace();
-      LangAS AddrSpaceR = RCanPointeeTy.getAddressSpace();
-      CastKind Kind = AddrSpaceL != AddrSpaceR ? CK_AddressSpaceConversion
-                                               : CK_BitCast;
-      if (LHSIsNull && !RHSIsNull)
-        LHS = ImpCastExprToType(LHS.get(), RHSType, Kind);
-      else
-        RHS = ImpCastExprToType(RHS.get(), LHSType, Kind);
-    }
-    return computeResultTy();
-  }
-
-  if (getLangOpts().CPlusPlus) {
-    // C++ [expr.eq]p4:
-    //   Two operands of type std::nullptr_t or one operand of type
-    //   std::nullptr_t and the other a null pointer constant compare equal.
-    if (!IsRelational && LHSIsNull && RHSIsNull) {
-      if (LHSType->isNullPtrType()) {
-        RHS = ImpCastExprToType(RHS.get(), LHSType, CK_NullToPointer);
-        return computeResultTy();
-      }
-      if (RHSType->isNullPtrType()) {
-        LHS = ImpCastExprToType(LHS.get(), RHSType, CK_NullToPointer);
-        return computeResultTy();
-      }
-    }
-
-    // Comparison of Objective-C pointers and block pointers against nullptr_t.
-    // These aren't covered by the composite pointer type rules.
-    if (!IsRelational && RHSType->isNullPtrType() &&
-        (LHSType->isObjCObjectPointerType() || LHSType->isBlockPointerType())) {
-      RHS = ImpCastExprToType(RHS.get(), LHSType, CK_NullToPointer);
-      return computeResultTy();
-    }
-    if (!IsRelational && LHSType->isNullPtrType() &&
-        (RHSType->isObjCObjectPointerType() || RHSType->isBlockPointerType())) {
-      LHS = ImpCastExprToType(LHS.get(), RHSType, CK_NullToPointer);
-      return computeResultTy();
-    }
-
-    if (IsRelational &&
-        ((LHSType->isNullPtrType() && RHSType->isPointerType()) ||
-         (RHSType->isNullPtrType() && LHSType->isPointerType()))) {
-      // HACK: Relational comparison of nullptr_t against a pointer type is
-      // invalid per DR583, but we allow it within std::less<> and friends,
-      // since otherwise common uses of it break.
-      // FIXME: Consider removing this hack once LWG fixes std::less<> and
-      // friends to have std::nullptr_t overload candidates.
-      DeclContext *DC = CurContext;
-      if (isa<FunctionDecl>(DC))
-        DC = DC->getParent();
-      if (auto *CTSD = dyn_cast<ClassTemplateSpecializationDecl>(DC)) {
-        if (CTSD->isInStdNamespace() &&
-            llvm::StringSwitch<bool>(CTSD->getName())
-                .Cases("less", "less_equal", "greater", "greater_equal", true)
-                .Default(false)) {
-          if (RHSType->isNullPtrType())
-            RHS = ImpCastExprToType(RHS.get(), LHSType, CK_NullToPointer);
-          else
-            LHS = ImpCastExprToType(LHS.get(), RHSType, CK_NullToPointer);
-          return computeResultTy();
-        }
-      }
-    }
-
-    // C++ [expr.eq]p2:
-    //   If at least one operand is a pointer to member, [...] bring them to
-    //   their composite pointer type.
-    if (!IsRelational &&
-        (LHSType->isMemberPointerType() || RHSType->isMemberPointerType())) {
-      if (convertPointersToCompositeType(*this, Loc, LHS, RHS))
-        return QualType();
-      else
-        return computeResultTy();
-    }
-  }
-
-  // Handle block pointer types.
-  if (!IsRelational && LHSType->isBlockPointerType() &&
-      RHSType->isBlockPointerType()) {
-    QualType lpointee = LHSType->castAs<BlockPointerType>()->getPointeeType();
-    QualType rpointee = RHSType->castAs<BlockPointerType>()->getPointeeType();
-
-    if (!LHSIsNull && !RHSIsNull &&
-        !Context.typesAreCompatible(lpointee, rpointee)) {
-      Diag(Loc, diag::err_typecheck_comparison_of_distinct_blocks)
-        << LHSType << RHSType << LHS.get()->getSourceRange()
-        << RHS.get()->getSourceRange();
-    }
-    RHS = ImpCastExprToType(RHS.get(), LHSType, CK_BitCast);
-    return computeResultTy();
-  }
-
-  // Allow block pointers to be compared with null pointer constants.
-  if (!IsRelational
-      && ((LHSType->isBlockPointerType() && RHSType->isPointerType())
-          || (LHSType->isPointerType() && RHSType->isBlockPointerType()))) {
-    if (!LHSIsNull && !RHSIsNull) {
-      if (!((RHSType->isPointerType() && RHSType->castAs<PointerType>()
-             ->getPointeeType()->isVoidType())
-            || (LHSType->isPointerType() && LHSType->castAs<PointerType>()
-                ->getPointeeType()->isVoidType())))
-        Diag(Loc, diag::err_typecheck_comparison_of_distinct_blocks)
-          << LHSType << RHSType << LHS.get()->getSourceRange()
-          << RHS.get()->getSourceRange();
-    }
-    if (LHSIsNull && !RHSIsNull)
-      LHS = ImpCastExprToType(LHS.get(), RHSType,
-                              RHSType->isPointerType() ? CK_BitCast
-                                : CK_AnyPointerToBlockPointerCast);
-    else
-      RHS = ImpCastExprToType(RHS.get(), LHSType,
-                              LHSType->isPointerType() ? CK_BitCast
-                                : CK_AnyPointerToBlockPointerCast);
-    return computeResultTy();
-  }
-
-  if (LHSType->isObjCObjectPointerType() ||
-      RHSType->isObjCObjectPointerType()) {
-    const PointerType *LPT = LHSType->getAs<PointerType>();
-    const PointerType *RPT = RHSType->getAs<PointerType>();
-    if (LPT || RPT) {
-      bool LPtrToVoid = LPT ? LPT->getPointeeType()->isVoidType() : false;
-      bool RPtrToVoid = RPT ? RPT->getPointeeType()->isVoidType() : false;
-
-      if (!LPtrToVoid && !RPtrToVoid &&
-          !Context.typesAreCompatible(LHSType, RHSType)) {
-        diagnoseDistinctPointerComparison(*this, Loc, LHS, RHS,
-                                          /*isError*/false);
-      }
-      if (LHSIsNull && !RHSIsNull) {
-        Expr *E = LHS.get();
-        if (getLangOpts().ObjCAutoRefCount)
-          CheckObjCConversion(SourceRange(), RHSType, E,
-                              CCK_ImplicitConversion);
-        LHS = ImpCastExprToType(E, RHSType,
-                                RPT ? CK_BitCast :CK_CPointerToObjCPointerCast);
-      }
-      else {
-        Expr *E = RHS.get();
-        if (getLangOpts().ObjCAutoRefCount)
-          CheckObjCConversion(SourceRange(), LHSType, E, CCK_ImplicitConversion,
-                              /*Diagnose=*/true,
-                              /*DiagnoseCFAudited=*/false, Opc);
-        RHS = ImpCastExprToType(E, LHSType,
-                                LPT ? CK_BitCast :CK_CPointerToObjCPointerCast);
-      }
-      return computeResultTy();
-    }
-    if (LHSType->isObjCObjectPointerType() &&
-        RHSType->isObjCObjectPointerType()) {
-      if (!Context.areComparableObjCPointerTypes(LHSType, RHSType))
-        diagnoseDistinctPointerComparison(*this, Loc, LHS, RHS,
-                                          /*isError*/false);
-      if (isObjCObjectLiteral(LHS) || isObjCObjectLiteral(RHS))
-        diagnoseObjCLiteralComparison(*this, Loc, LHS, RHS, Opc);
-
-      if (LHSIsNull && !RHSIsNull)
-        LHS = ImpCastExprToType(LHS.get(), RHSType, CK_BitCast);
-      else
-        RHS = ImpCastExprToType(RHS.get(), LHSType, CK_BitCast);
-      return computeResultTy();
-    }
-
-    if (!IsRelational && LHSType->isBlockPointerType() &&
-        RHSType->isBlockCompatibleObjCPointerType(Context)) {
-      LHS = ImpCastExprToType(LHS.get(), RHSType,
-                              CK_BlockPointerToObjCPointerCast);
-      return computeResultTy();
-    } else if (!IsRelational &&
-               LHSType->isBlockCompatibleObjCPointerType(Context) &&
-               RHSType->isBlockPointerType()) {
-      RHS = ImpCastExprToType(RHS.get(), LHSType,
-                              CK_BlockPointerToObjCPointerCast);
-      return computeResultTy();
-    }
-  }
-  if ((LHSType->isAnyPointerType() && RHSType->isIntegerType()) ||
-      (LHSType->isIntegerType() && RHSType->isAnyPointerType())) {
-    unsigned DiagID = 0;
-    bool isError = false;
-    if (LangOpts.DebuggerSupport) {
-      // Under a debugger, allow the comparison of pointers to integers,
-      // since users tend to want to compare addresses.
-    } else if ((LHSIsNull && LHSType->isIntegerType()) ||
-               (RHSIsNull && RHSType->isIntegerType())) {
-      if (IsRelational) {
-        isError = getLangOpts().CPlusPlus;
-        DiagID =
-          isError ? diag::err_typecheck_ordered_comparison_of_pointer_and_zero
-                  : diag::ext_typecheck_ordered_comparison_of_pointer_and_zero;
-      }
-    } else if (getLangOpts().CPlusPlus) {
-      DiagID = diag::err_typecheck_comparison_of_pointer_integer;
-      isError = true;
-    } else if (IsRelational)
-      DiagID = diag::ext_typecheck_ordered_comparison_of_pointer_integer;
-    else
-      DiagID = diag::ext_typecheck_comparison_of_pointer_integer;
-
-    if (DiagID) {
-      Diag(Loc, DiagID)
-        << LHSType << RHSType << LHS.get()->getSourceRange()
-        << RHS.get()->getSourceRange();
-      if (isError)
-        return QualType();
-    }
-
-    if (LHSType->isIntegerType())
-      LHS = ImpCastExprToType(LHS.get(), RHSType,
-                        LHSIsNull ? CK_NullToPointer : CK_IntegralToPointer);
-    else
-      RHS = ImpCastExprToType(RHS.get(), LHSType,
-                        RHSIsNull ? CK_NullToPointer : CK_IntegralToPointer);
-    return computeResultTy();
-  }
-
-  // Handle block pointers.
-  if (!IsRelational && RHSIsNull
-      && LHSType->isBlockPointerType() && RHSType->isIntegerType()) {
-    RHS = ImpCastExprToType(RHS.get(), LHSType, CK_NullToPointer);
-    return computeResultTy();
-  }
-  if (!IsRelational && LHSIsNull
-      && LHSType->isIntegerType() && RHSType->isBlockPointerType()) {
-    LHS = ImpCastExprToType(LHS.get(), RHSType, CK_NullToPointer);
-    return computeResultTy();
-  }
-
-  if (getLangOpts().OpenCLVersion >= 200) {
-    if (LHSType->isClkEventT() && RHSType->isClkEventT()) {
-      return computeResultTy();
-    }
-
-    if (LHSType->isQueueT() && RHSType->isQueueT()) {
-      return computeResultTy();
-    }
-
-    if (LHSIsNull && RHSType->isQueueT()) {
-      LHS = ImpCastExprToType(LHS.get(), RHSType, CK_NullToPointer);
-      return computeResultTy();
-    }
-
-    if (LHSType->isQueueT() && RHSIsNull) {
-      RHS = ImpCastExprToType(RHS.get(), LHSType, CK_NullToPointer);
-      return computeResultTy();
-    }
-  }
-
-  return InvalidOperands(Loc, LHS, RHS);
-}
-
-// Return a signed ext_vector_type that is of identical size and number of
-// elements. For floating point vectors, return an integer type of identical
-// size and number of elements. In the non ext_vector_type case, search from
-// the largest type to the smallest type to avoid cases where long long == long,
-// where long gets picked over long long.
-QualType Sema::GetSignedVectorType(QualType V) {
-  const VectorType *VTy = V->getAs<VectorType>();
-  unsigned TypeSize = Context.getTypeSize(VTy->getElementType());
-
-  if (isa<ExtVectorType>(VTy)) {
-    if (TypeSize == Context.getTypeSize(Context.CharTy))
-      return Context.getExtVectorType(Context.CharTy, VTy->getNumElements());
-    else if (TypeSize == Context.getTypeSize(Context.ShortTy))
-      return Context.getExtVectorType(Context.ShortTy, VTy->getNumElements());
-    else if (TypeSize == Context.getTypeSize(Context.IntTy))
-      return Context.getExtVectorType(Context.IntTy, VTy->getNumElements());
-    else if (TypeSize == Context.getTypeSize(Context.LongTy))
-      return Context.getExtVectorType(Context.LongTy, VTy->getNumElements());
-    assert(TypeSize == Context.getTypeSize(Context.LongLongTy) &&
-           "Unhandled vector element size in vector compare");
-    return Context.getExtVectorType(Context.LongLongTy, VTy->getNumElements());
-  }
-
-  if (TypeSize == Context.getTypeSize(Context.LongLongTy))
-    return Context.getVectorType(Context.LongLongTy, VTy->getNumElements(),
-                                 VectorType::GenericVector);
-  else if (TypeSize == Context.getTypeSize(Context.LongTy))
-    return Context.getVectorType(Context.LongTy, VTy->getNumElements(),
-                                 VectorType::GenericVector);
-  else if (TypeSize == Context.getTypeSize(Context.IntTy))
-    return Context.getVectorType(Context.IntTy, VTy->getNumElements(),
-                                 VectorType::GenericVector);
-  else if (TypeSize == Context.getTypeSize(Context.ShortTy))
-    return Context.getVectorType(Context.ShortTy, VTy->getNumElements(),
-                                 VectorType::GenericVector);
-  assert(TypeSize == Context.getTypeSize(Context.CharTy) &&
-         "Unhandled vector element size in vector compare");
-  return Context.getVectorType(Context.CharTy, VTy->getNumElements(),
-                               VectorType::GenericVector);
-}
-
-/// CheckVectorCompareOperands - vector comparisons are a clang extension that
-/// operates on extended vector types.  Instead of producing an IntTy result,
-/// like a scalar comparison, a vector comparison produces a vector of integer
-/// types.
-QualType Sema::CheckVectorCompareOperands(ExprResult &LHS, ExprResult &RHS,
-                                          SourceLocation Loc,
-                                          BinaryOperatorKind Opc) {
-  // Check to make sure we're operating on vectors of the same type and width,
-  // Allowing one side to be a scalar of element type.
-  QualType vType = CheckVectorOperands(LHS, RHS, Loc, /*isCompAssign*/false,
-                              /*AllowBothBool*/true,
-                              /*AllowBoolConversions*/getLangOpts().ZVector);
-  if (vType.isNull())
-    return vType;
-
-  QualType LHSType = LHS.get()->getType();
-
-  // If AltiVec, the comparison results in a numeric type, i.e.
-  // bool for C++, int for C
-  if (getLangOpts().AltiVec &&
-      vType->getAs<VectorType>()->getVectorKind() == VectorType::AltiVecVector)
-    return Context.getLogicalOperationType();
-
-  // For non-floating point types, check for self-comparisons of the form
-  // x == x, x != x, x < x, etc.  These always evaluate to a constant, and
-  // often indicate logic errors in the program.
-  diagnoseTautologicalComparison(*this, Loc, LHS.get(), RHS.get(), Opc);
-
-  // Check for comparisons of floating point operands using != and ==.
-  if (BinaryOperator::isEqualityOp(Opc) &&
-      LHSType->hasFloatingRepresentation()) {
-    assert(RHS.get()->getType()->hasFloatingRepresentation());
-    CheckFloatComparison(Loc, LHS.get(), RHS.get());
-  }
-
-  // Return a signed type for the vector.
-  return GetSignedVectorType(vType);
-}
-
-QualType Sema::CheckVectorLogicalOperands(ExprResult &LHS, ExprResult &RHS,
-                                          SourceLocation Loc) {
-  // Ensure that either both operands are of the same vector type, or
-  // one operand is of a vector type and the other is of its element type.
-  QualType vType = CheckVectorOperands(LHS, RHS, Loc, false,
-                                       /*AllowBothBool*/true,
-                                       /*AllowBoolConversions*/false);
-  if (vType.isNull())
-    return InvalidOperands(Loc, LHS, RHS);
-  if (getLangOpts().OpenCL && getLangOpts().OpenCLVersion < 120 &&
-      vType->hasFloatingRepresentation())
-    return InvalidOperands(Loc, LHS, RHS);
-  // FIXME: The check for C++ here is for GCC compatibility. GCC rejects the
-  //        usage of the logical operators && and || with vectors in C. This
-  //        check could be notionally dropped.
-  if (!getLangOpts().CPlusPlus &&
-      !(isa<ExtVectorType>(vType->getAs<VectorType>())))
-    return InvalidLogicalVectorOperands(Loc, LHS, RHS);
-
-  return GetSignedVectorType(LHS.get()->getType());
-}
-
-inline QualType Sema::CheckBitwiseOperands(ExprResult &LHS, ExprResult &RHS,
-                                           SourceLocation Loc,
-                                           BinaryOperatorKind Opc) {
-  checkArithmeticNull(*this, LHS, RHS, Loc, /*isCompare=*/false);
-
-  bool IsCompAssign =
-      Opc == BO_AndAssign || Opc == BO_OrAssign || Opc == BO_XorAssign;
-
-  if (LHS.get()->getType()->isVectorType() ||
-      RHS.get()->getType()->isVectorType()) {
-    if (LHS.get()->getType()->hasIntegerRepresentation() &&
-        RHS.get()->getType()->hasIntegerRepresentation())
-      return CheckVectorOperands(LHS, RHS, Loc, IsCompAssign,
-                        /*AllowBothBool*/true,
-                        /*AllowBoolConversions*/getLangOpts().ZVector);
-    return InvalidOperands(Loc, LHS, RHS);
-  }
-
-  if (Opc == BO_And)
-    diagnoseLogicalNotOnLHSofCheck(*this, LHS, RHS, Loc, Opc);
-
-  ExprResult LHSResult = LHS, RHSResult = RHS;
-  QualType compType = UsualArithmeticConversions(LHSResult, RHSResult,
-                                                 IsCompAssign);
-  if (LHSResult.isInvalid() || RHSResult.isInvalid())
-    return QualType();
-  LHS = LHSResult.get();
-  RHS = RHSResult.get();
-
-  if (!compType.isNull() && compType->isIntegralOrUnscopedEnumerationType())
-    return compType;
-  return InvalidOperands(Loc, LHS, RHS);
-}
-
-// C99 6.5.[13,14]
-inline QualType Sema::CheckLogicalOperands(ExprResult &LHS, ExprResult &RHS,
-                                           SourceLocation Loc,
-                                           BinaryOperatorKind Opc) {
-  // Check vector operands differently.
-  if (LHS.get()->getType()->isVectorType() || RHS.get()->getType()->isVectorType())
-    return CheckVectorLogicalOperands(LHS, RHS, Loc);
-
-  // Diagnose cases where the user write a logical and/or but probably meant a
-  // bitwise one.  We do this when the LHS is a non-bool integer and the RHS
-  // is a constant.
-  if (LHS.get()->getType()->isIntegerType() &&
-      !LHS.get()->getType()->isBooleanType() &&
-      RHS.get()->getType()->isIntegerType() && !RHS.get()->isValueDependent() &&
-      // Don't warn in macros or template instantiations.
-      !Loc.isMacroID() && !inTemplateInstantiation()) {
-    // If the RHS can be constant folded, and if it constant folds to something
-    // that isn't 0 or 1 (which indicate a potential logical operation that
-    // happened to fold to true/false) then warn.
-    // Parens on the RHS are ignored.
-    Expr::EvalResult EVResult;
-    if (RHS.get()->EvaluateAsInt(EVResult, Context)) {
-      llvm::APSInt Result = EVResult.Val.getInt();
-      if ((getLangOpts().Bool && !RHS.get()->getType()->isBooleanType() &&
-           !RHS.get()->getExprLoc().isMacroID()) ||
-          (Result != 0 && Result != 1)) {
-        Diag(Loc, diag::warn_logical_instead_of_bitwise)
-          << RHS.get()->getSourceRange()
-          << (Opc == BO_LAnd ? "&&" : "||");
-        // Suggest replacing the logical operator with the bitwise version
-        Diag(Loc, diag::note_logical_instead_of_bitwise_change_operator)
-            << (Opc == BO_LAnd ? "&" : "|")
-            << FixItHint::CreateReplacement(SourceRange(
-                                                 Loc, getLocForEndOfToken(Loc)),
-                                            Opc == BO_LAnd ? "&" : "|");
-        if (Opc == BO_LAnd)
-          // Suggest replacing "Foo() && kNonZero" with "Foo()"
-          Diag(Loc, diag::note_logical_instead_of_bitwise_remove_constant)
-              << FixItHint::CreateRemoval(
-                     SourceRange(getLocForEndOfToken(LHS.get()->getEndLoc()),
-                                 RHS.get()->getEndLoc()));
-      }
-    }
-  }
-
-  if (!Context.getLangOpts().CPlusPlus) {
-    // OpenCL v1.1 s6.3.g: The logical operators and (&&), or (||) do
-    // not operate on the built-in scalar and vector float types.
-    if (Context.getLangOpts().OpenCL &&
-        Context.getLangOpts().OpenCLVersion < 120) {
-      if (LHS.get()->getType()->isFloatingType() ||
-          RHS.get()->getType()->isFloatingType())
-        return InvalidOperands(Loc, LHS, RHS);
-    }
-
-    LHS = UsualUnaryConversions(LHS.get());
-    if (LHS.isInvalid())
-      return QualType();
-
-    RHS = UsualUnaryConversions(RHS.get());
-    if (RHS.isInvalid())
-      return QualType();
-
-    if (!LHS.get()->getType()->isScalarType() ||
-        !RHS.get()->getType()->isScalarType())
-      return InvalidOperands(Loc, LHS, RHS);
-
-    return Context.IntTy;
-  }
-
-  // The following is safe because we only use this method for
-  // non-overloadable operands.
-
-  // C++ [expr.log.and]p1
-  // C++ [expr.log.or]p1
-  // The operands are both contextually converted to type bool.
-  ExprResult LHSRes = PerformContextuallyConvertToBool(LHS.get());
-  if (LHSRes.isInvalid())
-    return InvalidOperands(Loc, LHS, RHS);
-  LHS = LHSRes;
-
-  ExprResult RHSRes = PerformContextuallyConvertToBool(RHS.get());
-  if (RHSRes.isInvalid())
-    return InvalidOperands(Loc, LHS, RHS);
-  RHS = RHSRes;
-
-  // C++ [expr.log.and]p2
-  // C++ [expr.log.or]p2
-  // The result is a bool.
-  return Context.BoolTy;
-}
-
-static bool IsReadonlyMessage(Expr *E, Sema &S) {
-  const MemberExpr *ME = dyn_cast<MemberExpr>(E);
-  if (!ME) return false;
-  if (!isa<FieldDecl>(ME->getMemberDecl())) return false;
-  ObjCMessageExpr *Base = dyn_cast<ObjCMessageExpr>(
-      ME->getBase()->IgnoreImplicit()->IgnoreParenImpCasts());
-  if (!Base) return false;
-  return Base->getMethodDecl() != nullptr;
-}
-
-/// Is the given expression (which must be 'const') a reference to a
-/// variable which was originally non-const, but which has become
-/// 'const' due to being captured within a block?
-enum NonConstCaptureKind { NCCK_None, NCCK_Block, NCCK_Lambda };
-static NonConstCaptureKind isReferenceToNonConstCapture(Sema &S, Expr *E) {
-  assert(E->isLValue() && E->getType().isConstQualified());
-  E = E->IgnoreParens();
-
-  // Must be a reference to a declaration from an enclosing scope.
-  DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E);
-  if (!DRE) return NCCK_None;
-  if (!DRE->refersToEnclosingVariableOrCapture()) return NCCK_None;
-
-  // The declaration must be a variable which is not declared 'const'.
-  VarDecl *var = dyn_cast<VarDecl>(DRE->getDecl());
-  if (!var) return NCCK_None;
-  if (var->getType().isConstQualified()) return NCCK_None;
-  assert(var->hasLocalStorage() && "capture added 'const' to non-local?");
-
-  // Decide whether the first capture was for a block or a lambda.
-  DeclContext *DC = S.CurContext, *Prev = nullptr;
-  // Decide whether the first capture was for a block or a lambda.
-  while (DC) {
-    // For init-capture, it is possible that the variable belongs to the
-    // template pattern of the current context.
-    if (auto *FD = dyn_cast<FunctionDecl>(DC))
-      if (var->isInitCapture() &&
-          FD->getTemplateInstantiationPattern() == var->getDeclContext())
-        break;
-    if (DC == var->getDeclContext())
-      break;
-    Prev = DC;
-    DC = DC->getParent();
-  }
-  // Unless we have an init-capture, we've gone one step too far.
-  if (!var->isInitCapture())
-    DC = Prev;
-  return (isa<BlockDecl>(DC) ? NCCK_Block : NCCK_Lambda);
-}
-
-static bool IsTypeModifiable(QualType Ty, bool IsDereference) {
-  Ty = Ty.getNonReferenceType();
-  if (IsDereference && Ty->isPointerType())
-    Ty = Ty->getPointeeType();
-  return !Ty.isConstQualified();
-}
-
-// Update err_typecheck_assign_const and note_typecheck_assign_const
-// when this enum is changed.
-enum {
-  ConstFunction,
-  ConstVariable,
-  ConstMember,
-  ConstMethod,
-  NestedConstMember,
-  ConstUnknown,  // Keep as last element
-};
-
-/// Emit the "read-only variable not assignable" error and print notes to give
-/// more information about why the variable is not assignable, such as pointing
-/// to the declaration of a const variable, showing that a method is const, or
-/// that the function is returning a const reference.
-static void DiagnoseConstAssignment(Sema &S, const Expr *E,
-                                    SourceLocation Loc) {
-  SourceRange ExprRange = E->getSourceRange();
-
-  // Only emit one error on the first const found.  All other consts will emit
-  // a note to the error.
-  bool DiagnosticEmitted = false;
-
-  // Track if the current expression is the result of a dereference, and if the
-  // next checked expression is the result of a dereference.
-  bool IsDereference = false;
-  bool NextIsDereference = false;
-
-  // Loop to process MemberExpr chains.
-  while (true) {
-    IsDereference = NextIsDereference;
-
-    E = E->IgnoreImplicit()->IgnoreParenImpCasts();
-    if (const MemberExpr *ME = dyn_cast<MemberExpr>(E)) {
-      NextIsDereference = ME->isArrow();
-      const ValueDecl *VD = ME->getMemberDecl();
-      if (const FieldDecl *Field = dyn_cast<FieldDecl>(VD)) {
-        // Mutable fields can be modified even if the class is const.
-        if (Field->isMutable()) {
-          assert(DiagnosticEmitted && "Expected diagnostic not emitted.");
-          break;
-        }
-
-        if (!IsTypeModifiable(Field->getType(), IsDereference)) {
-          if (!DiagnosticEmitted) {
-            S.Diag(Loc, diag::err_typecheck_assign_const)
-                << ExprRange << ConstMember << false /*static*/ << Field
-                << Field->getType();
-            DiagnosticEmitted = true;
-          }
-          S.Diag(VD->getLocation(), diag::note_typecheck_assign_const)
-              << ConstMember << false /*static*/ << Field << Field->getType()
-              << Field->getSourceRange();
-        }
-        E = ME->getBase();
-        continue;
-      } else if (const VarDecl *VDecl = dyn_cast<VarDecl>(VD)) {
-        if (VDecl->getType().isConstQualified()) {
-          if (!DiagnosticEmitted) {
-            S.Diag(Loc, diag::err_typecheck_assign_const)
-                << ExprRange << ConstMember << true /*static*/ << VDecl
-                << VDecl->getType();
-            DiagnosticEmitted = true;
-          }
-          S.Diag(VD->getLocation(), diag::note_typecheck_assign_const)
-              << ConstMember << true /*static*/ << VDecl << VDecl->getType()
-              << VDecl->getSourceRange();
-        }
-        // Static fields do not inherit constness from parents.
-        break;
-      }
-      break; // End MemberExpr
-    } else if (const ArraySubscriptExpr *ASE =
-                   dyn_cast<ArraySubscriptExpr>(E)) {
-      E = ASE->getBase()->IgnoreParenImpCasts();
-      continue;
-    } else if (const ExtVectorElementExpr *EVE =
-                   dyn_cast<ExtVectorElementExpr>(E)) {
-      E = EVE->getBase()->IgnoreParenImpCasts();
-      continue;
-    }
-    break;
-  }
-
-  if (const CallExpr *CE = dyn_cast<CallExpr>(E)) {
-    // Function calls
-    const FunctionDecl *FD = CE->getDirectCallee();
-    if (FD && !IsTypeModifiable(FD->getReturnType(), IsDereference)) {
-      if (!DiagnosticEmitted) {
-        S.Diag(Loc, diag::err_typecheck_assign_const) << ExprRange
-                                                      << ConstFunction << FD;
-        DiagnosticEmitted = true;
-      }
-      S.Diag(FD->getReturnTypeSourceRange().getBegin(),
-             diag::note_typecheck_assign_const)
-          << ConstFunction << FD << FD->getReturnType()
-          << FD->getReturnTypeSourceRange();
-    }
-  } else if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E)) {
-    // Point to variable declaration.
-    if (const ValueDecl *VD = DRE->getDecl()) {
-      if (!IsTypeModifiable(VD->getType(), IsDereference)) {
-        if (!DiagnosticEmitted) {
-          S.Diag(Loc, diag::err_typecheck_assign_const)
-              << ExprRange << ConstVariable << VD << VD->getType();
-          DiagnosticEmitted = true;
-        }
-        S.Diag(VD->getLocation(), diag::note_typecheck_assign_const)
-            << ConstVariable << VD << VD->getType() << VD->getSourceRange();
-      }
-    }
-  } else if (isa<CXXThisExpr>(E)) {
-    if (const DeclContext *DC = S.getFunctionLevelDeclContext()) {
-      if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(DC)) {
-        if (MD->isConst()) {
-          if (!DiagnosticEmitted) {
-            S.Diag(Loc, diag::err_typecheck_assign_const) << ExprRange
-                                                          << ConstMethod << MD;
-            DiagnosticEmitted = true;
-          }
-          S.Diag(MD->getLocation(), diag::note_typecheck_assign_const)
-              << ConstMethod << MD << MD->getSourceRange();
-        }
-      }
-    }
-  }
-
-  if (DiagnosticEmitted)
-    return;
-
-  // Can't determine a more specific message, so display the generic error.
-  S.Diag(Loc, diag::err_typecheck_assign_const) << ExprRange << ConstUnknown;
-}
-
-enum OriginalExprKind {
-  OEK_Variable,
-  OEK_Member,
-  OEK_LValue
-};
-
-static void DiagnoseRecursiveConstFields(Sema &S, const ValueDecl *VD,
-                                         const RecordType *Ty,
-                                         SourceLocation Loc, SourceRange Range,
-                                         OriginalExprKind OEK,
-                                         bool &DiagnosticEmitted) {
-  std::vector<const RecordType *> RecordTypeList;
-  RecordTypeList.push_back(Ty);
-  unsigned NextToCheckIndex = 0;
-  // We walk the record hierarchy breadth-first to ensure that we print
-  // diagnostics in field nesting order.
-  while (RecordTypeList.size() > NextToCheckIndex) {
-    bool IsNested = NextToCheckIndex > 0;
-    for (const FieldDecl *Field :
-         RecordTypeList[NextToCheckIndex]->getDecl()->fields()) {
-      // First, check every field for constness.
-      QualType FieldTy = Field->getType();
-      if (FieldTy.isConstQualified()) {
-        if (!DiagnosticEmitted) {
-          S.Diag(Loc, diag::err_typecheck_assign_const)
-              << Range << NestedConstMember << OEK << VD
-              << IsNested << Field;
-          DiagnosticEmitted = true;
-        }
-        S.Diag(Field->getLocation(), diag::note_typecheck_assign_const)
-            << NestedConstMember << IsNested << Field
-            << FieldTy << Field->getSourceRange();
-      }
-
-      // Then we append it to the list to check next in order.
-      FieldTy = FieldTy.getCanonicalType();
-      if (const auto *FieldRecTy = FieldTy->getAs<RecordType>()) {
-        if (llvm::find(RecordTypeList, FieldRecTy) == RecordTypeList.end())
-          RecordTypeList.push_back(FieldRecTy);
-      }
-    }
-    ++NextToCheckIndex;
-  }
-}
-
-/// Emit an error for the case where a record we are trying to assign to has a
-/// const-qualified field somewhere in its hierarchy.
-static void DiagnoseRecursiveConstFields(Sema &S, const Expr *E,
-                                         SourceLocation Loc) {
-  QualType Ty = E->getType();
-  assert(Ty->isRecordType() && "lvalue was not record?");
-  SourceRange Range = E->getSourceRange();
-  const RecordType *RTy = Ty.getCanonicalType()->getAs<RecordType>();
-  bool DiagEmitted = false;
-
-  if (const MemberExpr *ME = dyn_cast<MemberExpr>(E))
-    DiagnoseRecursiveConstFields(S, ME->getMemberDecl(), RTy, Loc,
-            Range, OEK_Member, DiagEmitted);
-  else if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E))
-    DiagnoseRecursiveConstFields(S, DRE->getDecl(), RTy, Loc,
-            Range, OEK_Variable, DiagEmitted);
-  else
-    DiagnoseRecursiveConstFields(S, nullptr, RTy, Loc,
-            Range, OEK_LValue, DiagEmitted);
-  if (!DiagEmitted)
-    DiagnoseConstAssignment(S, E, Loc);
-}
-
-/// CheckForModifiableLvalue - Verify that E is a modifiable lvalue.  If not,
-/// emit an error and return true.  If so, return false.
-static bool CheckForModifiableLvalue(Expr *E, SourceLocation Loc, Sema &S) {
-  assert(!E->hasPlaceholderType(BuiltinType::PseudoObject));
-
-  S.CheckShadowingDeclModification(E, Loc);
-
-  SourceLocation OrigLoc = Loc;
-  Expr::isModifiableLvalueResult IsLV = E->isModifiableLvalue(S.Context,
-                                                              &Loc);
-  if (IsLV == Expr::MLV_ClassTemporary && IsReadonlyMessage(E, S))
-    IsLV = Expr::MLV_InvalidMessageExpression;
-  if (IsLV == Expr::MLV_Valid)
-    return false;
-
-  unsigned DiagID = 0;
-  bool NeedType = false;
-  switch (IsLV) { // C99 6.5.16p2
-  case Expr::MLV_ConstQualified:
-    // Use a specialized diagnostic when we're assigning to an object
-    // from an enclosing function or block.
-    if (NonConstCaptureKind NCCK = isReferenceToNonConstCapture(S, E)) {
-      if (NCCK == NCCK_Block)
-        DiagID = diag::err_block_decl_ref_not_modifiable_lvalue;
-      else
-        DiagID = diag::err_lambda_decl_ref_not_modifiable_lvalue;
-      break;
-    }
-
-    // In ARC, use some specialized diagnostics for occasions where we
-    // infer 'const'.  These are always pseudo-strong variables.
-    if (S.getLangOpts().ObjCAutoRefCount) {
-      DeclRefExpr *declRef = dyn_cast<DeclRefExpr>(E->IgnoreParenCasts());
-      if (declRef && isa<VarDecl>(declRef->getDecl())) {
-        VarDecl *var = cast<VarDecl>(declRef->getDecl());
-
-        // Use the normal diagnostic if it's pseudo-__strong but the
-        // user actually wrote 'const'.
-        if (var->isARCPseudoStrong() &&
-            (!var->getTypeSourceInfo() ||
-             !var->getTypeSourceInfo()->getType().isConstQualified())) {
-          // There are three pseudo-strong cases:
-          //  - self
-          ObjCMethodDecl *method = S.getCurMethodDecl();
-          if (method && var == method->getSelfDecl()) {
-            DiagID = method->isClassMethod()
-              ? diag::err_typecheck_arc_assign_self_class_method
-              : diag::err_typecheck_arc_assign_self;
-
-          //  - Objective-C externally_retained attribute.
-          } else if (var->hasAttr<ObjCExternallyRetainedAttr>() ||
-                     isa<ParmVarDecl>(var)) {
-            DiagID = diag::err_typecheck_arc_assign_externally_retained;
-
-          //  - fast enumeration variables
-          } else {
-            DiagID = diag::err_typecheck_arr_assign_enumeration;
-          }
-
-          SourceRange Assign;
-          if (Loc != OrigLoc)
-            Assign = SourceRange(OrigLoc, OrigLoc);
-          S.Diag(Loc, DiagID) << E->getSourceRange() << Assign;
-          // We need to preserve the AST regardless, so migration tool
-          // can do its job.
-          return false;
-        }
-      }
-    }
-
-    // If none of the special cases above are triggered, then this is a
-    // simple const assignment.
-    if (DiagID == 0) {
-      DiagnoseConstAssignment(S, E, Loc);
-      return true;
-    }
-
-    break;
-  case Expr::MLV_ConstAddrSpace:
-    DiagnoseConstAssignment(S, E, Loc);
-    return true;
-  case Expr::MLV_ConstQualifiedField:
-    DiagnoseRecursiveConstFields(S, E, Loc);
-    return true;
-  case Expr::MLV_ArrayType:
-  case Expr::MLV_ArrayTemporary:
-    DiagID = diag::err_typecheck_array_not_modifiable_lvalue;
-    NeedType = true;
-    break;
-  case Expr::MLV_NotObjectType:
-    DiagID = diag::err_typecheck_non_object_not_modifiable_lvalue;
-    NeedType = true;
-    break;
-  case Expr::MLV_LValueCast:
-    DiagID = diag::err_typecheck_lvalue_casts_not_supported;
-    break;
-  case Expr::MLV_Valid:
-    llvm_unreachable("did not take early return for MLV_Valid");
-  case Expr::MLV_InvalidExpression:
-  case Expr::MLV_MemberFunction:
-  case Expr::MLV_ClassTemporary:
-    DiagID = diag::err_typecheck_expression_not_modifiable_lvalue;
-    break;
-  case Expr::MLV_IncompleteType:
-  case Expr::MLV_IncompleteVoidType:
-    return S.RequireCompleteType(Loc, E->getType(),
-             diag::err_typecheck_incomplete_type_not_modifiable_lvalue, E);
-  case Expr::MLV_DuplicateVectorComponents:
-    DiagID = diag::err_typecheck_duplicate_vector_components_not_mlvalue;
-    break;
-  case Expr::MLV_NoSetterProperty:
-    llvm_unreachable("readonly properties should be processed differently");
-  case Expr::MLV_InvalidMessageExpression:
-    DiagID = diag::err_readonly_message_assignment;
-    break;
-  case Expr::MLV_SubObjCPropertySetting:
-    DiagID = diag::err_no_subobject_property_setting;
-    break;
-  }
-
-  SourceRange Assign;
-  if (Loc != OrigLoc)
-    Assign = SourceRange(OrigLoc, OrigLoc);
-  if (NeedType)
-    S.Diag(Loc, DiagID) << E->getType() << E->getSourceRange() << Assign;
-  else
-    S.Diag(Loc, DiagID) << E->getSourceRange() << Assign;
-  return true;
-}
-
-static void CheckIdentityFieldAssignment(Expr *LHSExpr, Expr *RHSExpr,
-                                         SourceLocation Loc,
-                                         Sema &Sema) {
-  if (Sema.inTemplateInstantiation())
-    return;
-  if (Sema.isUnevaluatedContext())
-    return;
-  if (Loc.isInvalid() || Loc.isMacroID())
-    return;
-  if (LHSExpr->getExprLoc().isMacroID() || RHSExpr->getExprLoc().isMacroID())
-    return;
-
-  // C / C++ fields
-  MemberExpr *ML = dyn_cast<MemberExpr>(LHSExpr);
-  MemberExpr *MR = dyn_cast<MemberExpr>(RHSExpr);
-  if (ML && MR) {
-    if (!(isa<CXXThisExpr>(ML->getBase()) && isa<CXXThisExpr>(MR->getBase())))
-      return;
-    const ValueDecl *LHSDecl =
-        cast<ValueDecl>(ML->getMemberDecl()->getCanonicalDecl());
-    const ValueDecl *RHSDecl =
-        cast<ValueDecl>(MR->getMemberDecl()->getCanonicalDecl());
-    if (LHSDecl != RHSDecl)
-      return;
-    if (LHSDecl->getType().isVolatileQualified())
-      return;
-    if (const ReferenceType *RefTy = LHSDecl->getType()->getAs<ReferenceType>())
-      if (RefTy->getPointeeType().isVolatileQualified())
-        return;
-
-    Sema.Diag(Loc, diag::warn_identity_field_assign) << 0;
-  }
-
-  // Objective-C instance variables
-  ObjCIvarRefExpr *OL = dyn_cast<ObjCIvarRefExpr>(LHSExpr);
-  ObjCIvarRefExpr *OR = dyn_cast<ObjCIvarRefExpr>(RHSExpr);
-  if (OL && OR && OL->getDecl() == OR->getDecl()) {
-    DeclRefExpr *RL = dyn_cast<DeclRefExpr>(OL->getBase()->IgnoreImpCasts());
-    DeclRefExpr *RR = dyn_cast<DeclRefExpr>(OR->getBase()->IgnoreImpCasts());
-    if (RL && RR && RL->getDecl() == RR->getDecl())
-      Sema.Diag(Loc, diag::warn_identity_field_assign) << 1;
-  }
-}
-
-// C99 6.5.16.1
-QualType Sema::CheckAssignmentOperands(Expr *LHSExpr, ExprResult &RHS,
-                                       SourceLocation Loc,
-                                       QualType CompoundType) {
-  assert(!LHSExpr->hasPlaceholderType(BuiltinType::PseudoObject));
-
-  // Verify that LHS is a modifiable lvalue, and emit error if not.
-  if (CheckForModifiableLvalue(LHSExpr, Loc, *this))
-    return QualType();
-
-  QualType LHSType = LHSExpr->getType();
-  QualType RHSType = CompoundType.isNull() ? RHS.get()->getType() :
-                                             CompoundType;
-  // OpenCL v1.2 s6.1.1.1 p2:
-  // The half data type can only be used to declare a pointer to a buffer that
-  // contains half values
-  if (getLangOpts().OpenCL && !getOpenCLOptions().isEnabled("cl_khr_fp16") &&
-    LHSType->isHalfType()) {
-    Diag(Loc, diag::err_opencl_half_load_store) << 1
-        << LHSType.getUnqualifiedType();
-    return QualType();
-  }
-
-  AssignConvertType ConvTy;
-  if (CompoundType.isNull()) {
-    Expr *RHSCheck = RHS.get();
-
-    CheckIdentityFieldAssignment(LHSExpr, RHSCheck, Loc, *this);
-
-    QualType LHSTy(LHSType);
-    ConvTy = CheckSingleAssignmentConstraints(LHSTy, RHS);
-    if (RHS.isInvalid())
-      return QualType();
-    // Special case of NSObject attributes on c-style pointer types.
-    if (ConvTy == IncompatiblePointer &&
-        ((Context.isObjCNSObjectType(LHSType) &&
-          RHSType->isObjCObjectPointerType()) ||
-         (Context.isObjCNSObjectType(RHSType) &&
-          LHSType->isObjCObjectPointerType())))
-      ConvTy = Compatible;
-
-    if (ConvTy == Compatible &&
-        LHSType->isObjCObjectType())
-        Diag(Loc, diag::err_objc_object_assignment)
-          << LHSType;
-
-    // If the RHS is a unary plus or minus, check to see if they = and + are
-    // right next to each other.  If so, the user may have typo'd "x =+ 4"
-    // instead of "x += 4".
-    if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(RHSCheck))
-      RHSCheck = ICE->getSubExpr();
-    if (UnaryOperator *UO = dyn_cast<UnaryOperator>(RHSCheck)) {
-      if ((UO->getOpcode() == UO_Plus || UO->getOpcode() == UO_Minus) &&
-          Loc.isFileID() && UO->getOperatorLoc().isFileID() &&
-          // Only if the two operators are exactly adjacent.
-          Loc.getLocWithOffset(1) == UO->getOperatorLoc() &&
-          // And there is a space or other character before the subexpr of the
-          // unary +/-.  We don't want to warn on "x=-1".
-          Loc.getLocWithOffset(2) != UO->getSubExpr()->getBeginLoc() &&
-          UO->getSubExpr()->getBeginLoc().isFileID()) {
-        Diag(Loc, diag::warn_not_compound_assign)
-          << (UO->getOpcode() == UO_Plus ? "+" : "-")
-          << SourceRange(UO->getOperatorLoc(), UO->getOperatorLoc());
-      }
-    }
-
-    if (ConvTy == Compatible) {
-      if (LHSType.getObjCLifetime() == Qualifiers::OCL_Strong) {
-        // Warn about retain cycles where a block captures the LHS, but
-        // not if the LHS is a simple variable into which the block is
-        // being stored...unless that variable can be captured by reference!
-        const Expr *InnerLHS = LHSExpr->IgnoreParenCasts();
-        const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(InnerLHS);
-        if (!DRE || DRE->getDecl()->hasAttr<BlocksAttr>())
-          checkRetainCycles(LHSExpr, RHS.get());
-      }
-
-      if (LHSType.getObjCLifetime() == Qualifiers::OCL_Strong ||
-          LHSType.isNonWeakInMRRWithObjCWeak(Context)) {
-        // It is safe to assign a weak reference into a strong variable.
-        // Although this code can still have problems:
-        //   id x = self.weakProp;
-        //   id y = self.weakProp;
-        // we do not warn to warn spuriously when 'x' and 'y' are on separate
-        // paths through the function. This should be revisited if
-        // -Wrepeated-use-of-weak is made flow-sensitive.
-        // For ObjCWeak only, we do not warn if the assign is to a non-weak
-        // variable, which will be valid for the current autorelease scope.
-        if (!Diags.isIgnored(diag::warn_arc_repeated_use_of_weak,
-                             RHS.get()->getBeginLoc()))
-          getCurFunction()->markSafeWeakUse(RHS.get());
-
-      } else if (getLangOpts().ObjCAutoRefCount || getLangOpts().ObjCWeak) {
-        checkUnsafeExprAssigns(Loc, LHSExpr, RHS.get());
-      }
-    }
-  } else {
-    // Compound assignment "x += y"
-    ConvTy = CheckAssignmentConstraints(Loc, LHSType, RHSType);
-  }
-
-  if (DiagnoseAssignmentResult(ConvTy, Loc, LHSType, RHSType,
-                               RHS.get(), AA_Assigning))
-    return QualType();
-
-  CheckForNullPointerDereference(*this, LHSExpr);
-
-  // C99 6.5.16p3: The type of an assignment expression is the type of the
-  // left operand unless the left operand has qualified type, in which case
-  // it is the unqualified version of the type of the left operand.
-  // C99 6.5.16.1p2: In simple assignment, the value of the right operand
-  // is converted to the type of the assignment expression (above).
-  // C++ 5.17p1: the type of the assignment expression is that of its left
-  // operand.
-  return (getLangOpts().CPlusPlus
-          ? LHSType : LHSType.getUnqualifiedType());
-}
-
-// Only ignore explicit casts to void.
-static bool IgnoreCommaOperand(const Expr *E) {
-  E = E->IgnoreParens();
-
-  if (const CastExpr *CE = dyn_cast<CastExpr>(E)) {
-    if (CE->getCastKind() == CK_ToVoid) {
-      return true;
-    }
-
-    // static_cast<void> on a dependent type will not show up as CK_ToVoid.
-    if (CE->getCastKind() == CK_Dependent && E->getType()->isVoidType() &&
-        CE->getSubExpr()->getType()->isDependentType()) {
-      return true;
-    }
-  }
-
-  return false;
-}
-
-// Look for instances where it is likely the comma operator is confused with
-// another operator.  There is a whitelist of acceptable expressions for the
-// left hand side of the comma operator, otherwise emit a warning.
-void Sema::DiagnoseCommaOperator(const Expr *LHS, SourceLocation Loc) {
-  // No warnings in macros
-  if (Loc.isMacroID())
-    return;
-
-  // Don't warn in template instantiations.
-  if (inTemplateInstantiation())
-    return;
-
-  // Scope isn't fine-grained enough to whitelist the specific cases, so
-  // instead, skip more than needed, then call back into here with the
-  // CommaVisitor in SemaStmt.cpp.
-  // The whitelisted locations are the initialization and increment portions
-  // of a for loop.  The additional checks are on the condition of
-  // if statements, do/while loops, and for loops.
-  // Differences in scope flags for C89 mode requires the extra logic.
-  const unsigned ForIncrementFlags =
-      getLangOpts().C99 || getLangOpts().CPlusPlus
-          ? Scope::ControlScope | Scope::ContinueScope | Scope::BreakScope
-          : Scope::ContinueScope | Scope::BreakScope;
-  const unsigned ForInitFlags = Scope::ControlScope | Scope::DeclScope;
-  const unsigned ScopeFlags = getCurScope()->getFlags();
-  if ((ScopeFlags & ForIncrementFlags) == ForIncrementFlags ||
-      (ScopeFlags & ForInitFlags) == ForInitFlags)
-    return;
-
-  // If there are multiple comma operators used together, get the RHS of the
-  // of the comma operator as the LHS.
-  while (const BinaryOperator *BO = dyn_cast<BinaryOperator>(LHS)) {
-    if (BO->getOpcode() != BO_Comma)
-      break;
-    LHS = BO->getRHS();
-  }
-
-  // Only allow some expressions on LHS to not warn.
-  if (IgnoreCommaOperand(LHS))
-    return;
-
-  Diag(Loc, diag::warn_comma_operator);
-  Diag(LHS->getBeginLoc(), diag::note_cast_to_void)
-      << LHS->getSourceRange()
-      << FixItHint::CreateInsertion(LHS->getBeginLoc(),
-                                    LangOpts.CPlusPlus ? "static_cast<void>("
-                                                       : "(void)(")
-      << FixItHint::CreateInsertion(PP.getLocForEndOfToken(LHS->getEndLoc()),
-                                    ")");
-}
-
-// C99 6.5.17
-static QualType CheckCommaOperands(Sema &S, ExprResult &LHS, ExprResult &RHS,
-                                   SourceLocation Loc) {
-  LHS = S.CheckPlaceholderExpr(LHS.get());
-  RHS = S.CheckPlaceholderExpr(RHS.get());
-  if (LHS.isInvalid() || RHS.isInvalid())
-    return QualType();
-
-  // C's comma performs lvalue conversion (C99 6.3.2.1) on both its
-  // operands, but not unary promotions.
-  // C++'s comma does not do any conversions at all (C++ [expr.comma]p1).
-
-  // So we treat the LHS as a ignored value, and in C++ we allow the
-  // containing site to determine what should be done with the RHS.
-  LHS = S.IgnoredValueConversions(LHS.get());
-  if (LHS.isInvalid())
-    return QualType();
-
-  S.DiagnoseUnusedExprResult(LHS.get());
-
-  if (!S.getLangOpts().CPlusPlus) {
-    RHS = S.DefaultFunctionArrayLvalueConversion(RHS.get());
-    if (RHS.isInvalid())
-      return QualType();
-    if (!RHS.get()->getType()->isVoidType())
-      S.RequireCompleteType(Loc, RHS.get()->getType(),
-                            diag::err_incomplete_type);
-  }
-
-  if (!S.getDiagnostics().isIgnored(diag::warn_comma_operator, Loc))
-    S.DiagnoseCommaOperator(LHS.get(), Loc);
-
-  return RHS.get()->getType();
-}
-
-/// CheckIncrementDecrementOperand - unlike most "Check" methods, this routine
-/// doesn't need to call UsualUnaryConversions or UsualArithmeticConversions.
-static QualType CheckIncrementDecrementOperand(Sema &S, Expr *Op,
-                                               ExprValueKind &VK,
-                                               ExprObjectKind &OK,
-                                               SourceLocation OpLoc,
-                                               bool IsInc, bool IsPrefix) {
-  if (Op->isTypeDependent())
-    return S.Context.DependentTy;
-
-  QualType ResType = Op->getType();
-  // Atomic types can be used for increment / decrement where the non-atomic
-  // versions can, so ignore the _Atomic() specifier for the purpose of
-  // checking.
-  if (const AtomicType *ResAtomicType = ResType->getAs<AtomicType>())
-    ResType = ResAtomicType->getValueType();
-
-  assert(!ResType.isNull() && "no type for increment/decrement expression");
-
-  if (S.getLangOpts().CPlusPlus && ResType->isBooleanType()) {
-    // Decrement of bool is not allowed.
-    if (!IsInc) {
-      S.Diag(OpLoc, diag::err_decrement_bool) << Op->getSourceRange();
-      return QualType();
-    }
-    // Increment of bool sets it to true, but is deprecated.
-    S.Diag(OpLoc, S.getLangOpts().CPlusPlus17 ? diag::ext_increment_bool
-                                              : diag::warn_increment_bool)
-      << Op->getSourceRange();
-  } else if (S.getLangOpts().CPlusPlus && ResType->isEnumeralType()) {
-    // Error on enum increments and decrements in C++ mode
-    S.Diag(OpLoc, diag::err_increment_decrement_enum) << IsInc << ResType;
-    return QualType();
-  } else if (ResType->isRealType()) {
-    // OK!
-  } else if (ResType->isPointerType()) {
-    // C99 6.5.2.4p2, 6.5.6p2
-    if (!checkArithmeticOpPointerOperand(S, OpLoc, Op))
-      return QualType();
-  } else if (ResType->isObjCObjectPointerType()) {
-    // On modern runtimes, ObjC pointer arithmetic is forbidden.
-    // Otherwise, we just need a complete type.
-    if (checkArithmeticIncompletePointerType(S, OpLoc, Op) ||
-        checkArithmeticOnObjCPointer(S, OpLoc, Op))
-      return QualType();
-  } else if (ResType->isAnyComplexType()) {
-    // C99 does not support ++/-- on complex types, we allow as an extension.
-    S.Diag(OpLoc, diag::ext_integer_increment_complex)
-      << ResType << Op->getSourceRange();
-  } else if (ResType->isPlaceholderType()) {
-    ExprResult PR = S.CheckPlaceholderExpr(Op);
-    if (PR.isInvalid()) return QualType();
-    return CheckIncrementDecrementOperand(S, PR.get(), VK, OK, OpLoc,
-                                          IsInc, IsPrefix);
-  } else if (S.getLangOpts().AltiVec && ResType->isVectorType()) {
-    // OK! ( C/C++ Language Extensions for CBEA(Version 2.6) 10.3 )
-  } else if (S.getLangOpts().ZVector && ResType->isVectorType() &&
-             (ResType->getAs<VectorType>()->getVectorKind() !=
-              VectorType::AltiVecBool)) {
-    // The z vector extensions allow ++ and -- for non-bool vectors.
-  } else if(S.getLangOpts().OpenCL && ResType->isVectorType() &&
-            ResType->getAs<VectorType>()->getElementType()->isIntegerType()) {
-    // OpenCL V1.2 6.3 says dec/inc ops operate on integer vector types.
-  } else {
-    S.Diag(OpLoc, diag::err_typecheck_illegal_increment_decrement)
-      << ResType << int(IsInc) << Op->getSourceRange();
-    return QualType();
-  }
-  // At this point, we know we have a real, complex or pointer type.
-  // Now make sure the operand is a modifiable lvalue.
-  if (CheckForModifiableLvalue(Op, OpLoc, S))
-    return QualType();
-  // In C++, a prefix increment is the same type as the operand. Otherwise
-  // (in C or with postfix), the increment is the unqualified type of the
-  // operand.
-  if (IsPrefix && S.getLangOpts().CPlusPlus) {
-    VK = VK_LValue;
-    OK = Op->getObjectKind();
-    return ResType;
-  } else {
-    VK = VK_RValue;
-    return ResType.getUnqualifiedType();
-  }
-}
-
-
-/// getPrimaryDecl - Helper function for CheckAddressOfOperand().
-/// This routine allows us to typecheck complex/recursive expressions
-/// where the declaration is needed for type checking. We only need to
-/// handle cases when the expression references a function designator
-/// or is an lvalue. Here are some examples:
-///  - &(x) => x
-///  - &*****f => f for f a function designator.
-///  - &s.xx => s
-///  - &s.zz[1].yy -> s, if zz is an array
-///  - *(x + 1) -> x, if x is an array
-///  - &"123"[2] -> 0
-///  - & __real__ x -> x
-static ValueDecl *getPrimaryDecl(Expr *E) {
-  switch (E->getStmtClass()) {
-  case Stmt::DeclRefExprClass:
-    return cast<DeclRefExpr>(E)->getDecl();
-  case Stmt::MemberExprClass:
-    // If this is an arrow operator, the address is an offset from
-    // the base's value, so the object the base refers to is
-    // irrelevant.
-    if (cast<MemberExpr>(E)->isArrow())
-      return nullptr;
-    // Otherwise, the expression refers to a part of the base
-    return getPrimaryDecl(cast<MemberExpr>(E)->getBase());
-  case Stmt::ArraySubscriptExprClass: {
-    // FIXME: This code shouldn't be necessary!  We should catch the implicit
-    // promotion of register arrays earlier.
-    Expr* Base = cast<ArraySubscriptExpr>(E)->getBase();
-    if (ImplicitCastExpr* ICE = dyn_cast<ImplicitCastExpr>(Base)) {
-      if (ICE->getSubExpr()->getType()->isArrayType())
-        return getPrimaryDecl(ICE->getSubExpr());
-    }
-    return nullptr;
-  }
-  case Stmt::UnaryOperatorClass: {
-    UnaryOperator *UO = cast<UnaryOperator>(E);
-
-    switch(UO->getOpcode()) {
-    case UO_Real:
-    case UO_Imag:
-    case UO_Extension:
-      return getPrimaryDecl(UO->getSubExpr());
-    default:
-      return nullptr;
-    }
-  }
-  case Stmt::ParenExprClass:
-    return getPrimaryDecl(cast<ParenExpr>(E)->getSubExpr());
-  case Stmt::ImplicitCastExprClass:
-    // If the result of an implicit cast is an l-value, we care about
-    // the sub-expression; otherwise, the result here doesn't matter.
-    return getPrimaryDecl(cast<ImplicitCastExpr>(E)->getSubExpr());
-  default:
-    return nullptr;
-  }
-}
-
-namespace {
-  enum {
-    AO_Bit_Field = 0,
-    AO_Vector_Element = 1,
-    AO_Property_Expansion = 2,
-    AO_Register_Variable = 3,
-    AO_No_Error = 4
-  };
-}
-/// Diagnose invalid operand for address of operations.
-///
-/// \param Type The type of operand which cannot have its address taken.
-static void diagnoseAddressOfInvalidType(Sema &S, SourceLocation Loc,
-                                         Expr *E, unsigned Type) {
-  S.Diag(Loc, diag::err_typecheck_address_of) << Type << E->getSourceRange();
-}
-
-/// CheckAddressOfOperand - The operand of & must be either a function
-/// designator or an lvalue designating an object. If it is an lvalue, the
-/// object cannot be declared with storage class register or be a bit field.
-/// Note: The usual conversions are *not* applied to the operand of the &
-/// operator (C99 6.3.2.1p[2-4]), and its result is never an lvalue.
-/// In C++, the operand might be an overloaded function name, in which case
-/// we allow the '&' but retain the overloaded-function type.
-QualType Sema::CheckAddressOfOperand(ExprResult &OrigOp, SourceLocation OpLoc) {
-  if (const BuiltinType *PTy = OrigOp.get()->getType()->getAsPlaceholderType()){
-    if (PTy->getKind() == BuiltinType::Overload) {
-      Expr *E = OrigOp.get()->IgnoreParens();
-      if (!isa<OverloadExpr>(E)) {
-        assert(cast<UnaryOperator>(E)->getOpcode() == UO_AddrOf);
-        Diag(OpLoc, diag::err_typecheck_invalid_lvalue_addrof_addrof_function)
-          << OrigOp.get()->getSourceRange();
-        return QualType();
-      }
-
-      OverloadExpr *Ovl = cast<OverloadExpr>(E);
-      if (isa<UnresolvedMemberExpr>(Ovl))
-        if (!ResolveSingleFunctionTemplateSpecialization(Ovl)) {
-          Diag(OpLoc, diag::err_invalid_form_pointer_member_function)
-            << OrigOp.get()->getSourceRange();
-          return QualType();
-        }
-
-      return Context.OverloadTy;
-    }
-
-    if (PTy->getKind() == BuiltinType::UnknownAny)
-      return Context.UnknownAnyTy;
-
-    if (PTy->getKind() == BuiltinType::BoundMember) {
-      Diag(OpLoc, diag::err_invalid_form_pointer_member_function)
-        << OrigOp.get()->getSourceRange();
-      return QualType();
-    }
-
-    OrigOp = CheckPlaceholderExpr(OrigOp.get());
-    if (OrigOp.isInvalid()) return QualType();
-  }
-
-  if (OrigOp.get()->isTypeDependent())
-    return Context.DependentTy;
-
-  assert(!OrigOp.get()->getType()->isPlaceholderType());
-
-  // Make sure to ignore parentheses in subsequent checks
-  Expr *op = OrigOp.get()->IgnoreParens();
-
-  // In OpenCL captures for blocks called as lambda functions
-  // are located in the private address space. Blocks used in
-  // enqueue_kernel can be located in a different address space
-  // depending on a vendor implementation. Thus preventing
-  // taking an address of the capture to avoid invalid AS casts.
-  if (LangOpts.OpenCL) {
-    auto* VarRef = dyn_cast<DeclRefExpr>(op);
-    if (VarRef && VarRef->refersToEnclosingVariableOrCapture()) {
-      Diag(op->getExprLoc(), diag::err_opencl_taking_address_capture);
-      return QualType();
-    }
-  }
-
-  if (getLangOpts().C99) {
-    // Implement C99-only parts of addressof rules.
-    if (UnaryOperator* uOp = dyn_cast<UnaryOperator>(op)) {
-      if (uOp->getOpcode() == UO_Deref)
-        // Per C99 6.5.3.2, the address of a deref always returns a valid result
-        // (assuming the deref expression is valid).
-        return uOp->getSubExpr()->getType();
-    }
-    // Technically, there should be a check for array subscript
-    // expressions here, but the result of one is always an lvalue anyway.
-  }
-  ValueDecl *dcl = getPrimaryDecl(op);
-
-  if (auto *FD = dyn_cast_or_null<FunctionDecl>(dcl))
-    if (!checkAddressOfFunctionIsAvailable(FD, /*Complain=*/true,
-                                           op->getBeginLoc()))
-      return QualType();
-
-  Expr::LValueClassification lval = op->ClassifyLValue(Context);
-  unsigned AddressOfError = AO_No_Error;
-
-  if (lval == Expr::LV_ClassTemporary || lval == Expr::LV_ArrayTemporary) {
-    bool sfinae = (bool)isSFINAEContext();
-    Diag(OpLoc, isSFINAEContext() ? diag::err_typecheck_addrof_temporary
-                                  : diag::ext_typecheck_addrof_temporary)
-      << op->getType() << op->getSourceRange();
-    if (sfinae)
-      return QualType();
-    // Materialize the temporary as an lvalue so that we can take its address.
-    OrigOp = op =
-        CreateMaterializeTemporaryExpr(op->getType(), OrigOp.get(), true);
-  } else if (isa<ObjCSelectorExpr>(op)) {
-    return Context.getPointerType(op->getType());
-  } else if (lval == Expr::LV_MemberFunction) {
-    // If it's an instance method, make a member pointer.
-    // The expression must have exactly the form &A::foo.
-
-    // If the underlying expression isn't a decl ref, give up.
-    if (!isa<DeclRefExpr>(op)) {
-      Diag(OpLoc, diag::err_invalid_form_pointer_member_function)
-        << OrigOp.get()->getSourceRange();
-      return QualType();
-    }
-    DeclRefExpr *DRE = cast<DeclRefExpr>(op);
-    CXXMethodDecl *MD = cast<CXXMethodDecl>(DRE->getDecl());
-
-    // The id-expression was parenthesized.
-    if (OrigOp.get() != DRE) {
-      Diag(OpLoc, diag::err_parens_pointer_member_function)
-        << OrigOp.get()->getSourceRange();
-
-    // The method was named without a qualifier.
-    } else if (!DRE->getQualifier()) {
-      if (MD->getParent()->getName().empty())
-        Diag(OpLoc, diag::err_unqualified_pointer_member_function)
-          << op->getSourceRange();
-      else {
-        SmallString<32> Str;
-        StringRef Qual = (MD->getParent()->getName() + "::").toStringRef(Str);
-        Diag(OpLoc, diag::err_unqualified_pointer_member_function)
-          << op->getSourceRange()
-          << FixItHint::CreateInsertion(op->getSourceRange().getBegin(), Qual);
-      }
-    }
-
-    // Taking the address of a dtor is illegal per C++ [class.dtor]p2.
-    if (isa<CXXDestructorDecl>(MD))
-      Diag(OpLoc, diag::err_typecheck_addrof_dtor) << op->getSourceRange();
-
-    QualType MPTy = Context.getMemberPointerType(
-        op->getType(), Context.getTypeDeclType(MD->getParent()).getTypePtr());
-    // Under the MS ABI, lock down the inheritance model now.
-    if (Context.getTargetInfo().getCXXABI().isMicrosoft())
-      (void)isCompleteType(OpLoc, MPTy);
-    return MPTy;
-  } else if (lval != Expr::LV_Valid && lval != Expr::LV_IncompleteVoidType) {
-    // C99 6.5.3.2p1
-    // The operand must be either an l-value or a function designator
-    if (!op->getType()->isFunctionType()) {
-      // Use a special diagnostic for loads from property references.
-      if (isa<PseudoObjectExpr>(op)) {
-        AddressOfError = AO_Property_Expansion;
-      } else {
-        Diag(OpLoc, diag::err_typecheck_invalid_lvalue_addrof)
-          << op->getType() << op->getSourceRange();
-        return QualType();
-      }
-    }
-  } else if (op->getObjectKind() == OK_BitField) { // C99 6.5.3.2p1
-    // The operand cannot be a bit-field
-    AddressOfError = AO_Bit_Field;
-  } else if (op->getObjectKind() == OK_VectorComponent) {
-    // The operand cannot be an element of a vector
-    AddressOfError = AO_Vector_Element;
-  } else if (dcl) { // C99 6.5.3.2p1
-    // We have an lvalue with a decl. Make sure the decl is not declared
-    // with the register storage-class specifier.
-    if (const VarDecl *vd = dyn_cast<VarDecl>(dcl)) {
-      // in C++ it is not error to take address of a register
-      // variable (c++03 7.1.1P3)
-      if (vd->getStorageClass() == SC_Register &&
-          !getLangOpts().CPlusPlus) {
-        AddressOfError = AO_Register_Variable;
-      }
-    } else if (isa<MSPropertyDecl>(dcl)) {
-      AddressOfError = AO_Property_Expansion;
-    } else if (isa<FunctionTemplateDecl>(dcl)) {
-      return Context.OverloadTy;
-    } else if (isa<FieldDecl>(dcl) || isa<IndirectFieldDecl>(dcl)) {
-      // Okay: we can take the address of a field.
-      // Could be a pointer to member, though, if there is an explicit
-      // scope qualifier for the class.
-      if (isa<DeclRefExpr>(op) && cast<DeclRefExpr>(op)->getQualifier()) {
-        DeclContext *Ctx = dcl->getDeclContext();
-        if (Ctx && Ctx->isRecord()) {
-          if (dcl->getType()->isReferenceType()) {
-            Diag(OpLoc,
-                 diag::err_cannot_form_pointer_to_member_of_reference_type)
-              << dcl->getDeclName() << dcl->getType();
-            return QualType();
-          }
-
-          while (cast<RecordDecl>(Ctx)->isAnonymousStructOrUnion())
-            Ctx = Ctx->getParent();
-
-          QualType MPTy = Context.getMemberPointerType(
-              op->getType(),
-              Context.getTypeDeclType(cast<RecordDecl>(Ctx)).getTypePtr());
-          // Under the MS ABI, lock down the inheritance model now.
-          if (Context.getTargetInfo().getCXXABI().isMicrosoft())
-            (void)isCompleteType(OpLoc, MPTy);
-          return MPTy;
-        }
-      }
-    } else if (!isa<FunctionDecl>(dcl) && !isa<NonTypeTemplateParmDecl>(dcl) &&
-               !isa<BindingDecl>(dcl))
-      llvm_unreachable("Unknown/unexpected decl type");
-  }
-
-  if (AddressOfError != AO_No_Error) {
-    diagnoseAddressOfInvalidType(*this, OpLoc, op, AddressOfError);
-    return QualType();
-  }
-
-  if (lval == Expr::LV_IncompleteVoidType) {
-    // Taking the address of a void variable is technically illegal, but we
-    // allow it in cases which are otherwise valid.
-    // Example: "extern void x; void* y = &x;".
-    Diag(OpLoc, diag::ext_typecheck_addrof_void) << op->getSourceRange();
-  }
-
-  // If the operand has type "type", the result has type "pointer to type".
-  if (op->getType()->isObjCObjectType())
-    return Context.getObjCObjectPointerType(op->getType());
-
-  CheckAddressOfPackedMember(op);
-
-  return Context.getPointerType(op->getType());
-}
-
-static void RecordModifiableNonNullParam(Sema &S, const Expr *Exp) {
-  const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(Exp);
-  if (!DRE)
-    return;
-  const Decl *D = DRE->getDecl();
-  if (!D)
-    return;
-  const ParmVarDecl *Param = dyn_cast<ParmVarDecl>(D);
-  if (!Param)
-    return;
-  if (const FunctionDecl* FD = dyn_cast<FunctionDecl>(Param->getDeclContext()))
-    if (!FD->hasAttr<NonNullAttr>() && !Param->hasAttr<NonNullAttr>())
-      return;
-  if (FunctionScopeInfo *FD = S.getCurFunction())
-    if (!FD->ModifiedNonNullParams.count(Param))
-      FD->ModifiedNonNullParams.insert(Param);
-}
-
-/// CheckIndirectionOperand - Type check unary indirection (prefix '*').
-static QualType CheckIndirectionOperand(Sema &S, Expr *Op, ExprValueKind &VK,
-                                        SourceLocation OpLoc) {
-  if (Op->isTypeDependent())
-    return S.Context.DependentTy;
-
-  ExprResult ConvResult = S.UsualUnaryConversions(Op);
-  if (ConvResult.isInvalid())
-    return QualType();
-  Op = ConvResult.get();
-  QualType OpTy = Op->getType();
-  QualType Result;
-
-  if (isa<CXXReinterpretCastExpr>(Op)) {
-    QualType OpOrigType = Op->IgnoreParenCasts()->getType();
-    S.CheckCompatibleReinterpretCast(OpOrigType, OpTy, /*IsDereference*/true,
-                                     Op->getSourceRange());
-  }
-
-  if (const PointerType *PT = OpTy->getAs<PointerType>())
-  {
-    Result = PT->getPointeeType();
-  }
-  else if (const ObjCObjectPointerType *OPT =
-             OpTy->getAs<ObjCObjectPointerType>())
-    Result = OPT->getPointeeType();
-  else {
-    ExprResult PR = S.CheckPlaceholderExpr(Op);
-    if (PR.isInvalid()) return QualType();
-    if (PR.get() != Op)
-      return CheckIndirectionOperand(S, PR.get(), VK, OpLoc);
-  }
-
-  if (Result.isNull()) {
-    S.Diag(OpLoc, diag::err_typecheck_indirection_requires_pointer)
-      << OpTy << Op->getSourceRange();
-    return QualType();
-  }
-
-  // Note that per both C89 and C99, indirection is always legal, even if Result
-  // is an incomplete type or void.  It would be possible to warn about
-  // dereferencing a void pointer, but it's completely well-defined, and such a
-  // warning is unlikely to catch any mistakes. In C++, indirection is not valid
-  // for pointers to 'void' but is fine for any other pointer type:
-  //
-  // C++ [expr.unary.op]p1:
-  //   [...] the expression to which [the unary * operator] is applied shall
-  //   be a pointer to an object type, or a pointer to a function type
-  if (S.getLangOpts().CPlusPlus && Result->isVoidType())
-    S.Diag(OpLoc, diag::ext_typecheck_indirection_through_void_pointer)
-      << OpTy << Op->getSourceRange();
-
-  // Dereferences are usually l-values...
-  VK = VK_LValue;
-
-  // ...except that certain expressions are never l-values in C.
-  if (!S.getLangOpts().CPlusPlus && Result.isCForbiddenLValueType())
-    VK = VK_RValue;
-
-  return Result;
-}
-
-BinaryOperatorKind Sema::ConvertTokenKindToBinaryOpcode(tok::TokenKind Kind) {
-  BinaryOperatorKind Opc;
-  switch (Kind) {
-  default: llvm_unreachable("Unknown binop!");
-  case tok::periodstar:           Opc = BO_PtrMemD; break;
-  case tok::arrowstar:            Opc = BO_PtrMemI; break;
-  case tok::star:                 Opc = BO_Mul; break;
-  case tok::slash:                Opc = BO_Div; break;
-  case tok::percent:              Opc = BO_Rem; break;
-  case tok::plus:                 Opc = BO_Add; break;
-  case tok::minus:                Opc = BO_Sub; break;
-  case tok::lessless:             Opc = BO_Shl; break;
-  case tok::greatergreater:       Opc = BO_Shr; break;
-  case tok::lessequal:            Opc = BO_LE; break;
-  case tok::less:                 Opc = BO_LT; break;
-  case tok::greaterequal:         Opc = BO_GE; break;
-  case tok::greater:              Opc = BO_GT; break;
-  case tok::exclaimequal:         Opc = BO_NE; break;
-  case tok::equalequal:           Opc = BO_EQ; break;
-  case tok::spaceship:            Opc = BO_Cmp; break;
-  case tok::amp:                  Opc = BO_And; break;
-  case tok::caret:                Opc = BO_Xor; break;
-  case tok::pipe:                 Opc = BO_Or; break;
-  case tok::ampamp:               Opc = BO_LAnd; break;
-  case tok::pipepipe:             Opc = BO_LOr; break;
-  case tok::equal:                Opc = BO_Assign; break;
-  case tok::starequal:            Opc = BO_MulAssign; break;
-  case tok::slashequal:           Opc = BO_DivAssign; break;
-  case tok::percentequal:         Opc = BO_RemAssign; break;
-  case tok::plusequal:            Opc = BO_AddAssign; break;
-  case tok::minusequal:           Opc = BO_SubAssign; break;
-  case tok::lesslessequal:        Opc = BO_ShlAssign; break;
-  case tok::greatergreaterequal:  Opc = BO_ShrAssign; break;
-  case tok::ampequal:             Opc = BO_AndAssign; break;
-  case tok::caretequal:           Opc = BO_XorAssign; break;
-  case tok::pipeequal:            Opc = BO_OrAssign; break;
-  case tok::comma:                Opc = BO_Comma; break;
-  }
-  return Opc;
-}
-
-static inline UnaryOperatorKind ConvertTokenKindToUnaryOpcode(
-  tok::TokenKind Kind) {
-  UnaryOperatorKind Opc;
-  switch (Kind) {
-  default: llvm_unreachable("Unknown unary op!");
-  case tok::plusplus:     Opc = UO_PreInc; break;
-  case tok::minusminus:   Opc = UO_PreDec; break;
-  case tok::amp:          Opc = UO_AddrOf; break;
-  case tok::star:         Opc = UO_Deref; break;
-  case tok::plus:         Opc = UO_Plus; break;
-  case tok::minus:        Opc = UO_Minus; break;
-  case tok::tilde:        Opc = UO_Not; break;
-  case tok::exclaim:      Opc = UO_LNot; break;
-  case tok::kw___real:    Opc = UO_Real; break;
-  case tok::kw___imag:    Opc = UO_Imag; break;
-  case tok::kw___extension__: Opc = UO_Extension; break;
-  }
-  return Opc;
-}
-
-/// DiagnoseSelfAssignment - Emits a warning if a value is assigned to itself.
-/// This warning suppressed in the event of macro expansions.
-static void DiagnoseSelfAssignment(Sema &S, Expr *LHSExpr, Expr *RHSExpr,
-                                   SourceLocation OpLoc, bool IsBuiltin) {
-  if (S.inTemplateInstantiation())
-    return;
-  if (S.isUnevaluatedContext())
-    return;
-  if (OpLoc.isInvalid() || OpLoc.isMacroID())
-    return;
-  LHSExpr = LHSExpr->IgnoreParenImpCasts();
-  RHSExpr = RHSExpr->IgnoreParenImpCasts();
-  const DeclRefExpr *LHSDeclRef = dyn_cast<DeclRefExpr>(LHSExpr);
-  const DeclRefExpr *RHSDeclRef = dyn_cast<DeclRefExpr>(RHSExpr);
-  if (!LHSDeclRef || !RHSDeclRef ||
-      LHSDeclRef->getLocation().isMacroID() ||
-      RHSDeclRef->getLocation().isMacroID())
-    return;
-  const ValueDecl *LHSDecl =
-    cast<ValueDecl>(LHSDeclRef->getDecl()->getCanonicalDecl());
-  const ValueDecl *RHSDecl =
-    cast<ValueDecl>(RHSDeclRef->getDecl()->getCanonicalDecl());
-  if (LHSDecl != RHSDecl)
-    return;
-  if (LHSDecl->getType().isVolatileQualified())
-    return;
-  if (const ReferenceType *RefTy = LHSDecl->getType()->getAs<ReferenceType>())
-    if (RefTy->getPointeeType().isVolatileQualified())
-      return;
-
-  S.Diag(OpLoc, IsBuiltin ? diag::warn_self_assignment_builtin
-                          : diag::warn_self_assignment_overloaded)
-      << LHSDeclRef->getType() << LHSExpr->getSourceRange()
-      << RHSExpr->getSourceRange();
-}
-
-/// Check if a bitwise-& is performed on an Objective-C pointer.  This
-/// is usually indicative of introspection within the Objective-C pointer.
-static void checkObjCPointerIntrospection(Sema &S, ExprResult &L, ExprResult &R,
-                                          SourceLocation OpLoc) {
-  if (!S.getLangOpts().ObjC)
-    return;
-
-  const Expr *ObjCPointerExpr = nullptr, *OtherExpr = nullptr;
-  const Expr *LHS = L.get();
-  const Expr *RHS = R.get();
-
-  if (LHS->IgnoreParenCasts()->getType()->isObjCObjectPointerType()) {
-    ObjCPointerExpr = LHS;
-    OtherExpr = RHS;
-  }
-  else if (RHS->IgnoreParenCasts()->getType()->isObjCObjectPointerType()) {
-    ObjCPointerExpr = RHS;
-    OtherExpr = LHS;
-  }
-
-  // This warning is deliberately made very specific to reduce false
-  // positives with logic that uses '&' for hashing.  This logic mainly
-  // looks for code trying to introspect into tagged pointers, which
-  // code should generally never do.
-  if (ObjCPointerExpr && isa<IntegerLiteral>(OtherExpr->IgnoreParenCasts())) {
-    unsigned Diag = diag::warn_objc_pointer_masking;
-    // Determine if we are introspecting the result of performSelectorXXX.
-    const Expr *Ex = ObjCPointerExpr->IgnoreParenCasts();
-    // Special case messages to -performSelector and friends, which
-    // can return non-pointer values boxed in a pointer value.
-    // Some clients may wish to silence warnings in this subcase.
-    if (const ObjCMessageExpr *ME = dyn_cast<ObjCMessageExpr>(Ex)) {
-      Selector S = ME->getSelector();
-      StringRef SelArg0 = S.getNameForSlot(0);
-      if (SelArg0.startswith("performSelector"))
-        Diag = diag::warn_objc_pointer_masking_performSelector;
-    }
-
-    S.Diag(OpLoc, Diag)
-      << ObjCPointerExpr->getSourceRange();
-  }
-}
-
-static NamedDecl *getDeclFromExpr(Expr *E) {
-  if (!E)
-    return nullptr;
-  if (auto *DRE = dyn_cast<DeclRefExpr>(E))
-    return DRE->getDecl();
-  if (auto *ME = dyn_cast<MemberExpr>(E))
-    return ME->getMemberDecl();
-  if (auto *IRE = dyn_cast<ObjCIvarRefExpr>(E))
-    return IRE->getDecl();
-  return nullptr;
-}
-
-// This helper function promotes a binary operator's operands (which are of a
-// half vector type) to a vector of floats and then truncates the result to
-// a vector of either half or short.
-static ExprResult convertHalfVecBinOp(Sema &S, ExprResult LHS, ExprResult RHS,
-                                      BinaryOperatorKind Opc, QualType ResultTy,
-                                      ExprValueKind VK, ExprObjectKind OK,
-                                      bool IsCompAssign, SourceLocation OpLoc,
-                                      FPOptions FPFeatures) {
-  auto &Context = S.getASTContext();
-  assert((isVector(ResultTy, Context.HalfTy) ||
-          isVector(ResultTy, Context.ShortTy)) &&
-         "Result must be a vector of half or short");
-  assert(isVector(LHS.get()->getType(), Context.HalfTy) &&
-         isVector(RHS.get()->getType(), Context.HalfTy) &&
-         "both operands expected to be a half vector");
-
-  RHS = convertVector(RHS.get(), Context.FloatTy, S);
-  QualType BinOpResTy = RHS.get()->getType();
-
-  // If Opc is a comparison, ResultType is a vector of shorts. In that case,
-  // change BinOpResTy to a vector of ints.
-  if (isVector(ResultTy, Context.ShortTy))
-    BinOpResTy = S.GetSignedVectorType(BinOpResTy);
-
-  if (IsCompAssign)
-    return new (Context) CompoundAssignOperator(
-        LHS.get(), RHS.get(), Opc, ResultTy, VK, OK, BinOpResTy, BinOpResTy,
-        OpLoc, FPFeatures);
-
-  LHS = convertVector(LHS.get(), Context.FloatTy, S);
-  auto *BO = new (Context) BinaryOperator(LHS.get(), RHS.get(), Opc, BinOpResTy,
-                                          VK, OK, OpLoc, FPFeatures);
-  return convertVector(BO, ResultTy->getAs<VectorType>()->getElementType(), S);
-}
-
-static std::pair<ExprResult, ExprResult>
-CorrectDelayedTyposInBinOp(Sema &S, BinaryOperatorKind Opc, Expr *LHSExpr,
-                           Expr *RHSExpr) {
-  ExprResult LHS = LHSExpr, RHS = RHSExpr;
-  if (!S.getLangOpts().CPlusPlus) {
-    // C cannot handle TypoExpr nodes on either side of a binop because it
-    // doesn't handle dependent types properly, so make sure any TypoExprs have
-    // been dealt with before checking the operands.
-    LHS = S.CorrectDelayedTyposInExpr(LHS);
-    RHS = S.CorrectDelayedTyposInExpr(RHS, [Opc, LHS](Expr *E) {
-      if (Opc != BO_Assign)
-        return ExprResult(E);
-      // Avoid correcting the RHS to the same Expr as the LHS.
-      Decl *D = getDeclFromExpr(E);
-      return (D && D == getDeclFromExpr(LHS.get())) ? ExprError() : E;
-    });
-  }
-  return std::make_pair(LHS, RHS);
-}
-
-/// Returns true if conversion between vectors of halfs and vectors of floats
-/// is needed.
-static bool needsConversionOfHalfVec(bool OpRequiresConversion, ASTContext &Ctx,
-                                     QualType SrcType) {
-  return OpRequiresConversion && !Ctx.getLangOpts().NativeHalfType &&
-         !Ctx.getTargetInfo().useFP16ConversionIntrinsics() &&
-         isVector(SrcType, Ctx.HalfTy);
-}
-
-/// CreateBuiltinBinOp - Creates a new built-in binary operation with
-/// operator @p Opc at location @c TokLoc. This routine only supports
-/// built-in operations; ActOnBinOp handles overloaded operators.
-ExprResult Sema::CreateBuiltinBinOp(SourceLocation OpLoc,
-                                    BinaryOperatorKind Opc,
-                                    Expr *LHSExpr, Expr *RHSExpr) {
-  if (getLangOpts().CPlusPlus11 && isa<InitListExpr>(RHSExpr)) {
-    // The syntax only allows initializer lists on the RHS of assignment,
-    // so we don't need to worry about accepting invalid code for
-    // non-assignment operators.
-    // C++11 5.17p9:
-    //   The meaning of x = {v} [...] is that of x = T(v) [...]. The meaning
-    //   of x = {} is x = T().
-    InitializationKind Kind = InitializationKind::CreateDirectList(
-        RHSExpr->getBeginLoc(), RHSExpr->getBeginLoc(), RHSExpr->getEndLoc());
-    InitializedEntity Entity =
-        InitializedEntity::InitializeTemporary(LHSExpr->getType());
-    InitializationSequence InitSeq(*this, Entity, Kind, RHSExpr);
-    ExprResult Init = InitSeq.Perform(*this, Entity, Kind, RHSExpr);
-    if (Init.isInvalid())
-      return Init;
-    RHSExpr = Init.get();
-  }
-
-  ExprResult LHS = LHSExpr, RHS = RHSExpr;
-  QualType ResultTy;     // Result type of the binary operator.
-  // The following two variables are used for compound assignment operators
-  QualType CompLHSTy;    // Type of LHS after promotions for computation
-  QualType CompResultTy; // Type of computation result
-  ExprValueKind VK = VK_RValue;
-  ExprObjectKind OK = OK_Ordinary;
-  bool ConvertHalfVec = false;
-
-  std::tie(LHS, RHS) = CorrectDelayedTyposInBinOp(*this, Opc, LHSExpr, RHSExpr);
-  if (!LHS.isUsable() || !RHS.isUsable())
-    return ExprError();
-
-  if (getLangOpts().OpenCL) {
-    QualType LHSTy = LHSExpr->getType();
-    QualType RHSTy = RHSExpr->getType();
-    // OpenCLC v2.0 s6.13.11.1 allows atomic variables to be initialized by
-    // the ATOMIC_VAR_INIT macro.
-    if (LHSTy->isAtomicType() || RHSTy->isAtomicType()) {
-      SourceRange SR(LHSExpr->getBeginLoc(), RHSExpr->getEndLoc());
-      if (BO_Assign == Opc)
-        Diag(OpLoc, diag::err_opencl_atomic_init) << 0 << SR;
-      else
-        ResultTy = InvalidOperands(OpLoc, LHS, RHS);
-      return ExprError();
-    }
-
-    // OpenCL special types - image, sampler, pipe, and blocks are to be used
-    // only with a builtin functions and therefore should be disallowed here.
-    if (LHSTy->isImageType() || RHSTy->isImageType() ||
-        LHSTy->isSamplerT() || RHSTy->isSamplerT() ||
-        LHSTy->isPipeType() || RHSTy->isPipeType() ||
-        LHSTy->isBlockPointerType() || RHSTy->isBlockPointerType()) {
-      ResultTy = InvalidOperands(OpLoc, LHS, RHS);
-      return ExprError();
-    }
-  }
-
-  switch (Opc) {
-  case BO_Assign:
-    ResultTy = CheckAssignmentOperands(LHS.get(), RHS, OpLoc, QualType());
-    if (getLangOpts().CPlusPlus &&
-        LHS.get()->getObjectKind() != OK_ObjCProperty) {
-      VK = LHS.get()->getValueKind();
-      OK = LHS.get()->getObjectKind();
-    }
-    if (!ResultTy.isNull()) {
-      DiagnoseSelfAssignment(*this, LHS.get(), RHS.get(), OpLoc, true);
-      DiagnoseSelfMove(LHS.get(), RHS.get(), OpLoc);
-    }
-    RecordModifiableNonNullParam(*this, LHS.get());
-    break;
-  case BO_PtrMemD:
-  case BO_PtrMemI:
-    ResultTy = CheckPointerToMemberOperands(LHS, RHS, VK, OpLoc,
-                                            Opc == BO_PtrMemI);
-    break;
-  case BO_Mul:
-  case BO_Div:
-    ConvertHalfVec = true;
-    ResultTy = CheckMultiplyDivideOperands(LHS, RHS, OpLoc, false,
-                                           Opc == BO_Div);
-    break;
-  case BO_Rem:
-    ResultTy = CheckRemainderOperands(LHS, RHS, OpLoc);
-    break;
-  case BO_Add:
-    ConvertHalfVec = true;
-    ResultTy = CheckAdditionOperands(LHS, RHS, OpLoc, Opc);
-    break;
-  case BO_Sub:
-    ConvertHalfVec = true;
-    ResultTy = CheckSubtractionOperands(LHS, RHS, OpLoc);
-    break;
-  case BO_Shl:
-  case BO_Shr:
-    ResultTy = CheckShiftOperands(LHS, RHS, OpLoc, Opc);
-    break;
-  case BO_LE:
-  case BO_LT:
-  case BO_GE:
-  case BO_GT:
-    ConvertHalfVec = true;
-    ResultTy = CheckCompareOperands(LHS, RHS, OpLoc, Opc);
-    break;
-  case BO_EQ:
-  case BO_NE:
-    ConvertHalfVec = true;
-    ResultTy = CheckCompareOperands(LHS, RHS, OpLoc, Opc);
-    break;
-  case BO_Cmp:
-    ConvertHalfVec = true;
-    ResultTy = CheckCompareOperands(LHS, RHS, OpLoc, Opc);
-    assert(ResultTy.isNull() || ResultTy->getAsCXXRecordDecl());
-    break;
-  case BO_And:
-    checkObjCPointerIntrospection(*this, LHS, RHS, OpLoc);
-    LLVM_FALLTHROUGH;
-  case BO_Xor:
-  case BO_Or:
-    ResultTy = CheckBitwiseOperands(LHS, RHS, OpLoc, Opc);
-    break;
-  case BO_LAnd:
-  case BO_LOr:
-    ConvertHalfVec = true;
-    ResultTy = CheckLogicalOperands(LHS, RHS, OpLoc, Opc);
-    break;
-  case BO_MulAssign:
-  case BO_DivAssign:
-    ConvertHalfVec = true;
-    CompResultTy = CheckMultiplyDivideOperands(LHS, RHS, OpLoc, true,
-                                               Opc == BO_DivAssign);
-    CompLHSTy = CompResultTy;
-    if (!CompResultTy.isNull() && !LHS.isInvalid() && !RHS.isInvalid())
-      ResultTy = CheckAssignmentOperands(LHS.get(), RHS, OpLoc, CompResultTy);
-    break;
-  case BO_RemAssign:
-    CompResultTy = CheckRemainderOperands(LHS, RHS, OpLoc, true);
-    CompLHSTy = CompResultTy;
-    if (!CompResultTy.isNull() && !LHS.isInvalid() && !RHS.isInvalid())
-      ResultTy = CheckAssignmentOperands(LHS.get(), RHS, OpLoc, CompResultTy);
-    break;
-  case BO_AddAssign:
-    ConvertHalfVec = true;
-    CompResultTy = CheckAdditionOperands(LHS, RHS, OpLoc, Opc, &CompLHSTy);
-    if (!CompResultTy.isNull() && !LHS.isInvalid() && !RHS.isInvalid())
-      ResultTy = CheckAssignmentOperands(LHS.get(), RHS, OpLoc, CompResultTy);
-    break;
-  case BO_SubAssign:
-    ConvertHalfVec = true;
-    CompResultTy = CheckSubtractionOperands(LHS, RHS, OpLoc, &CompLHSTy);
-    if (!CompResultTy.isNull() && !LHS.isInvalid() && !RHS.isInvalid())
-      ResultTy = CheckAssignmentOperands(LHS.get(), RHS, OpLoc, CompResultTy);
-    break;
-  case BO_ShlAssign:
-  case BO_ShrAssign:
-    CompResultTy = CheckShiftOperands(LHS, RHS, OpLoc, Opc, true);
-    CompLHSTy = CompResultTy;
-    if (!CompResultTy.isNull() && !LHS.isInvalid() && !RHS.isInvalid())
-      ResultTy = CheckAssignmentOperands(LHS.get(), RHS, OpLoc, CompResultTy);
-    break;
-  case BO_AndAssign:
-  case BO_OrAssign: // fallthrough
-    DiagnoseSelfAssignment(*this, LHS.get(), RHS.get(), OpLoc, true);
-    LLVM_FALLTHROUGH;
-  case BO_XorAssign:
-    CompResultTy = CheckBitwiseOperands(LHS, RHS, OpLoc, Opc);
-    CompLHSTy = CompResultTy;
-    if (!CompResultTy.isNull() && !LHS.isInvalid() && !RHS.isInvalid())
-      ResultTy = CheckAssignmentOperands(LHS.get(), RHS, OpLoc, CompResultTy);
-    break;
-  case BO_Comma:
-    ResultTy = CheckCommaOperands(*this, LHS, RHS, OpLoc);
-    if (getLangOpts().CPlusPlus && !RHS.isInvalid()) {
-      VK = RHS.get()->getValueKind();
-      OK = RHS.get()->getObjectKind();
-    }
-    break;
-  }
-  if (ResultTy.isNull() || LHS.isInvalid() || RHS.isInvalid())
-    return ExprError();
-
-  // Some of the binary operations require promoting operands of half vector to
-  // float vectors and truncating the result back to half vector. For now, we do
-  // this only when HalfArgsAndReturn is set (that is, when the target is arm or
-  // arm64).
-  assert(isVector(RHS.get()->getType(), Context.HalfTy) ==
-         isVector(LHS.get()->getType(), Context.HalfTy) &&
-         "both sides are half vectors or neither sides are");
-  ConvertHalfVec = needsConversionOfHalfVec(ConvertHalfVec, Context,
-                                            LHS.get()->getType());
-
-  // Check for array bounds violations for both sides of the BinaryOperator
-  CheckArrayAccess(LHS.get());
-  CheckArrayAccess(RHS.get());
-
-  if (const ObjCIsaExpr *OISA = dyn_cast<ObjCIsaExpr>(LHS.get()->IgnoreParenCasts())) {
-    NamedDecl *ObjectSetClass = LookupSingleName(TUScope,
-                                                 &Context.Idents.get("object_setClass"),
-                                                 SourceLocation(), LookupOrdinaryName);
-    if (ObjectSetClass && isa<ObjCIsaExpr>(LHS.get())) {
-      SourceLocation RHSLocEnd = getLocForEndOfToken(RHS.get()->getEndLoc());
-      Diag(LHS.get()->getExprLoc(), diag::warn_objc_isa_assign)
-          << FixItHint::CreateInsertion(LHS.get()->getBeginLoc(),
-                                        "object_setClass(")
-          << FixItHint::CreateReplacement(SourceRange(OISA->getOpLoc(), OpLoc),
-                                          ",")
-          << FixItHint::CreateInsertion(RHSLocEnd, ")");
-    }
-    else
-      Diag(LHS.get()->getExprLoc(), diag::warn_objc_isa_assign);
-  }
-  else if (const ObjCIvarRefExpr *OIRE =
-           dyn_cast<ObjCIvarRefExpr>(LHS.get()->IgnoreParenCasts()))
-    DiagnoseDirectIsaAccess(*this, OIRE, OpLoc, RHS.get());
-
-  // Opc is not a compound assignment if CompResultTy is null.
-  if (CompResultTy.isNull()) {
-    if (ConvertHalfVec)
-      return convertHalfVecBinOp(*this, LHS, RHS, Opc, ResultTy, VK, OK, false,
-                                 OpLoc, FPFeatures);
-    return new (Context) BinaryOperator(LHS.get(), RHS.get(), Opc, ResultTy, VK,
-                                        OK, OpLoc, FPFeatures);
-  }
-
-  // Handle compound assignments.
-  if (getLangOpts().CPlusPlus && LHS.get()->getObjectKind() !=
-      OK_ObjCProperty) {
-    VK = VK_LValue;
-    OK = LHS.get()->getObjectKind();
-  }
-
-  if (ConvertHalfVec)
-    return convertHalfVecBinOp(*this, LHS, RHS, Opc, ResultTy, VK, OK, true,
-                               OpLoc, FPFeatures);
-
-  return new (Context) CompoundAssignOperator(
-      LHS.get(), RHS.get(), Opc, ResultTy, VK, OK, CompLHSTy, CompResultTy,
-      OpLoc, FPFeatures);
-}
-
-/// DiagnoseBitwisePrecedence - Emit a warning when bitwise and comparison
-/// operators are mixed in a way that suggests that the programmer forgot that
-/// comparison operators have higher precedence. The most typical example of
-/// such code is "flags & 0x0020 != 0", which is equivalent to "flags & 1".
-static void DiagnoseBitwisePrecedence(Sema &Self, BinaryOperatorKind Opc,
-                                      SourceLocation OpLoc, Expr *LHSExpr,
-                                      Expr *RHSExpr) {
-  BinaryOperator *LHSBO = dyn_cast<BinaryOperator>(LHSExpr);
-  BinaryOperator *RHSBO = dyn_cast<BinaryOperator>(RHSExpr);
-
-  // Check that one of the sides is a comparison operator and the other isn't.
-  bool isLeftComp = LHSBO && LHSBO->isComparisonOp();
-  bool isRightComp = RHSBO && RHSBO->isComparisonOp();
-  if (isLeftComp == isRightComp)
-    return;
-
-  // Bitwise operations are sometimes used as eager logical ops.
-  // Don't diagnose this.
-  bool isLeftBitwise = LHSBO && LHSBO->isBitwiseOp();
-  bool isRightBitwise = RHSBO && RHSBO->isBitwiseOp();
-  if (isLeftBitwise || isRightBitwise)
-    return;
-
-  SourceRange DiagRange = isLeftComp
-                              ? SourceRange(LHSExpr->getBeginLoc(), OpLoc)
-                              : SourceRange(OpLoc, RHSExpr->getEndLoc());
-  StringRef OpStr = isLeftComp ? LHSBO->getOpcodeStr() : RHSBO->getOpcodeStr();
-  SourceRange ParensRange =
-      isLeftComp
-          ? SourceRange(LHSBO->getRHS()->getBeginLoc(), RHSExpr->getEndLoc())
-          : SourceRange(LHSExpr->getBeginLoc(), RHSBO->getLHS()->getEndLoc());
-
-  Self.Diag(OpLoc, diag::warn_precedence_bitwise_rel)
-    << DiagRange << BinaryOperator::getOpcodeStr(Opc) << OpStr;
-  SuggestParentheses(Self, OpLoc,
-    Self.PDiag(diag::note_precedence_silence) << OpStr,
-    (isLeftComp ? LHSExpr : RHSExpr)->getSourceRange());
-  SuggestParentheses(Self, OpLoc,
-    Self.PDiag(diag::note_precedence_bitwise_first)
-      << BinaryOperator::getOpcodeStr(Opc),
-    ParensRange);
-}
-
-/// It accepts a '&&' expr that is inside a '||' one.
-/// Emit a diagnostic together with a fixit hint that wraps the '&&' expression
-/// in parentheses.
-static void
-EmitDiagnosticForLogicalAndInLogicalOr(Sema &Self, SourceLocation OpLoc,
-                                       BinaryOperator *Bop) {
-  assert(Bop->getOpcode() == BO_LAnd);
-  Self.Diag(Bop->getOperatorLoc(), diag::warn_logical_and_in_logical_or)
-      << Bop->getSourceRange() << OpLoc;
-  SuggestParentheses(Self, Bop->getOperatorLoc(),
-    Self.PDiag(diag::note_precedence_silence)
-      << Bop->getOpcodeStr(),
-    Bop->getSourceRange());
-}
-
-/// Returns true if the given expression can be evaluated as a constant
-/// 'true'.
-static bool EvaluatesAsTrue(Sema &S, Expr *E) {
-  bool Res;
-  return !E->isValueDependent() &&
-         E->EvaluateAsBooleanCondition(Res, S.getASTContext()) && Res;
-}
-
-/// Returns true if the given expression can be evaluated as a constant
-/// 'false'.
-static bool EvaluatesAsFalse(Sema &S, Expr *E) {
-  bool Res;
-  return !E->isValueDependent() &&
-         E->EvaluateAsBooleanCondition(Res, S.getASTContext()) && !Res;
-}
-
-/// Look for '&&' in the left hand of a '||' expr.
-static void DiagnoseLogicalAndInLogicalOrLHS(Sema &S, SourceLocation OpLoc,
-                                             Expr *LHSExpr, Expr *RHSExpr) {
-  if (BinaryOperator *Bop = dyn_cast<BinaryOperator>(LHSExpr)) {
-    if (Bop->getOpcode() == BO_LAnd) {
-      // If it's "a && b || 0" don't warn since the precedence doesn't matter.
-      if (EvaluatesAsFalse(S, RHSExpr))
-        return;
-      // If it's "1 && a || b" don't warn since the precedence doesn't matter.
-      if (!EvaluatesAsTrue(S, Bop->getLHS()))
-        return EmitDiagnosticForLogicalAndInLogicalOr(S, OpLoc, Bop);
-    } else if (Bop->getOpcode() == BO_LOr) {
-      if (BinaryOperator *RBop = dyn_cast<BinaryOperator>(Bop->getRHS())) {
-        // If it's "a || b && 1 || c" we didn't warn earlier for
-        // "a || b && 1", but warn now.
-        if (RBop->getOpcode() == BO_LAnd && EvaluatesAsTrue(S, RBop->getRHS()))
-          return EmitDiagnosticForLogicalAndInLogicalOr(S, OpLoc, RBop);
-      }
-    }
-  }
-}
-
-/// Look for '&&' in the right hand of a '||' expr.
-static void DiagnoseLogicalAndInLogicalOrRHS(Sema &S, SourceLocation OpLoc,
-                                             Expr *LHSExpr, Expr *RHSExpr) {
-  if (BinaryOperator *Bop = dyn_cast<BinaryOperator>(RHSExpr)) {
-    if (Bop->getOpcode() == BO_LAnd) {
-      // If it's "0 || a && b" don't warn since the precedence doesn't matter.
-      if (EvaluatesAsFalse(S, LHSExpr))
-        return;
-      // If it's "a || b && 1" don't warn since the precedence doesn't matter.
-      if (!EvaluatesAsTrue(S, Bop->getRHS()))
-        return EmitDiagnosticForLogicalAndInLogicalOr(S, OpLoc, Bop);
-    }
-  }
-}
-
-/// Look for bitwise op in the left or right hand of a bitwise op with
-/// lower precedence and emit a diagnostic together with a fixit hint that wraps
-/// the '&' expression in parentheses.
-static void DiagnoseBitwiseOpInBitwiseOp(Sema &S, BinaryOperatorKind Opc,
-                                         SourceLocation OpLoc, Expr *SubExpr) {
-  if (BinaryOperator *Bop = dyn_cast<BinaryOperator>(SubExpr)) {
-    if (Bop->isBitwiseOp() && Bop->getOpcode() < Opc) {
-      S.Diag(Bop->getOperatorLoc(), diag::warn_bitwise_op_in_bitwise_op)
-        << Bop->getOpcodeStr() << BinaryOperator::getOpcodeStr(Opc)
-        << Bop->getSourceRange() << OpLoc;
-      SuggestParentheses(S, Bop->getOperatorLoc(),
-        S.PDiag(diag::note_precedence_silence)
-          << Bop->getOpcodeStr(),
-        Bop->getSourceRange());
-    }
-  }
-}
-
-static void DiagnoseAdditionInShift(Sema &S, SourceLocation OpLoc,
-                                    Expr *SubExpr, StringRef Shift) {
-  if (BinaryOperator *Bop = dyn_cast<BinaryOperator>(SubExpr)) {
-    if (Bop->getOpcode() == BO_Add || Bop->getOpcode() == BO_Sub) {
-      StringRef Op = Bop->getOpcodeStr();
-      S.Diag(Bop->getOperatorLoc(), diag::warn_addition_in_bitshift)
-          << Bop->getSourceRange() << OpLoc << Shift << Op;
-      SuggestParentheses(S, Bop->getOperatorLoc(),
-          S.PDiag(diag::note_precedence_silence) << Op,
-          Bop->getSourceRange());
-    }
-  }
-}
-
-static void DiagnoseShiftCompare(Sema &S, SourceLocation OpLoc,
-                                 Expr *LHSExpr, Expr *RHSExpr) {
-  CXXOperatorCallExpr *OCE = dyn_cast<CXXOperatorCallExpr>(LHSExpr);
-  if (!OCE)
-    return;
-
-  FunctionDecl *FD = OCE->getDirectCallee();
-  if (!FD || !FD->isOverloadedOperator())
-    return;
-
-  OverloadedOperatorKind Kind = FD->getOverloadedOperator();
-  if (Kind != OO_LessLess && Kind != OO_GreaterGreater)
-    return;
-
-  S.Diag(OpLoc, diag::warn_overloaded_shift_in_comparison)
-      << LHSExpr->getSourceRange() << RHSExpr->getSourceRange()
-      << (Kind == OO_LessLess);
-  SuggestParentheses(S, OCE->getOperatorLoc(),
-                     S.PDiag(diag::note_precedence_silence)
-                         << (Kind == OO_LessLess ? "<<" : ">>"),
-                     OCE->getSourceRange());
-  SuggestParentheses(
-      S, OpLoc, S.PDiag(diag::note_evaluate_comparison_first),
-      SourceRange(OCE->getArg(1)->getBeginLoc(), RHSExpr->getEndLoc()));
-}
-
-/// DiagnoseBinOpPrecedence - Emit warnings for expressions with tricky
-/// precedence.
-static void DiagnoseBinOpPrecedence(Sema &Self, BinaryOperatorKind Opc,
-                                    SourceLocation OpLoc, Expr *LHSExpr,
-                                    Expr *RHSExpr){
-  // Diagnose "arg1 'bitwise' arg2 'eq' arg3".
-  if (BinaryOperator::isBitwiseOp(Opc))
-    DiagnoseBitwisePrecedence(Self, Opc, OpLoc, LHSExpr, RHSExpr);
-
-  // Diagnose "arg1 & arg2 | arg3"
-  if ((Opc == BO_Or || Opc == BO_Xor) &&
-      !OpLoc.isMacroID()/* Don't warn in macros. */) {
-    DiagnoseBitwiseOpInBitwiseOp(Self, Opc, OpLoc, LHSExpr);
-    DiagnoseBitwiseOpInBitwiseOp(Self, Opc, OpLoc, RHSExpr);
-  }
-
-  // Warn about arg1 || arg2 && arg3, as GCC 4.3+ does.
-  // We don't warn for 'assert(a || b && "bad")' since this is safe.
-  if (Opc == BO_LOr && !OpLoc.isMacroID()/* Don't warn in macros. */) {
-    DiagnoseLogicalAndInLogicalOrLHS(Self, OpLoc, LHSExpr, RHSExpr);
-    DiagnoseLogicalAndInLogicalOrRHS(Self, OpLoc, LHSExpr, RHSExpr);
-  }
-
-  if ((Opc == BO_Shl && LHSExpr->getType()->isIntegralType(Self.getASTContext()))
-      || Opc == BO_Shr) {
-    StringRef Shift = BinaryOperator::getOpcodeStr(Opc);
-    DiagnoseAdditionInShift(Self, OpLoc, LHSExpr, Shift);
-    DiagnoseAdditionInShift(Self, OpLoc, RHSExpr, Shift);
-  }
-
-  // Warn on overloaded shift operators and comparisons, such as:
-  // cout << 5 == 4;
-  if (BinaryOperator::isComparisonOp(Opc))
-    DiagnoseShiftCompare(Self, OpLoc, LHSExpr, RHSExpr);
-}
-
-// Binary Operators.  'Tok' is the token for the operator.
-ExprResult Sema::ActOnBinOp(Scope *S, SourceLocation TokLoc,
-                            tok::TokenKind Kind,
-                            Expr *LHSExpr, Expr *RHSExpr) {
-  BinaryOperatorKind Opc = ConvertTokenKindToBinaryOpcode(Kind);
-  assert(LHSExpr && "ActOnBinOp(): missing left expression");
-  assert(RHSExpr && "ActOnBinOp(): missing right expression");
-
-  // Emit warnings for tricky precedence issues, e.g. "bitfield & 0x4 == 0"
-  DiagnoseBinOpPrecedence(*this, Opc, TokLoc, LHSExpr, RHSExpr);
-
-  return BuildBinOp(S, TokLoc, Opc, LHSExpr, RHSExpr);
-}
-
-/// Build an overloaded binary operator expression in the given scope.
-static ExprResult BuildOverloadedBinOp(Sema &S, Scope *Sc, SourceLocation OpLoc,
-                                       BinaryOperatorKind Opc,
-                                       Expr *LHS, Expr *RHS) {
-  switch (Opc) {
-  case BO_Assign:
-  case BO_DivAssign:
-  case BO_RemAssign:
-  case BO_SubAssign:
-  case BO_AndAssign:
-  case BO_OrAssign:
-  case BO_XorAssign:
-    DiagnoseSelfAssignment(S, LHS, RHS, OpLoc, false);
-    CheckIdentityFieldAssignment(LHS, RHS, OpLoc, S);
-    break;
-  default:
-    break;
-  }
-
-  // Find all of the overloaded operators visible from this
-  // point. We perform both an operator-name lookup from the local
-  // scope and an argument-dependent lookup based on the types of
-  // the arguments.
-  UnresolvedSet<16> Functions;
-  OverloadedOperatorKind OverOp
-    = BinaryOperator::getOverloadedOperator(Opc);
-  if (Sc && OverOp != OO_None && OverOp != OO_Equal)
-    S.LookupOverloadedOperatorName(OverOp, Sc, LHS->getType(),
-                                   RHS->getType(), Functions);
-
-  // Build the (potentially-overloaded, potentially-dependent)
-  // binary operation.
-  return S.CreateOverloadedBinOp(OpLoc, Opc, Functions, LHS, RHS);
-}
-
-ExprResult Sema::BuildBinOp(Scope *S, SourceLocation OpLoc,
-                            BinaryOperatorKind Opc,
-                            Expr *LHSExpr, Expr *RHSExpr) {
-  ExprResult LHS, RHS;
-  std::tie(LHS, RHS) = CorrectDelayedTyposInBinOp(*this, Opc, LHSExpr, RHSExpr);
-  if (!LHS.isUsable() || !RHS.isUsable())
-    return ExprError();
-  LHSExpr = LHS.get();
-  RHSExpr = RHS.get();
-
-  // We want to end up calling one of checkPseudoObjectAssignment
-  // (if the LHS is a pseudo-object), BuildOverloadedBinOp (if
-  // both expressions are overloadable or either is type-dependent),
-  // or CreateBuiltinBinOp (in any other case).  We also want to get
-  // any placeholder types out of the way.
-
-  // Handle pseudo-objects in the LHS.
-  if (const BuiltinType *pty = LHSExpr->getType()->getAsPlaceholderType()) {
-    // Assignments with a pseudo-object l-value need special analysis.
-    if (pty->getKind() == BuiltinType::PseudoObject &&
-        BinaryOperator::isAssignmentOp(Opc))
-      return checkPseudoObjectAssignment(S, OpLoc, Opc, LHSExpr, RHSExpr);
-
-    // Don't resolve overloads if the other type is overloadable.
-    if (getLangOpts().CPlusPlus && pty->getKind() == BuiltinType::Overload) {
-      // We can't actually test that if we still have a placeholder,
-      // though.  Fortunately, none of the exceptions we see in that
-      // code below are valid when the LHS is an overload set.  Note
-      // that an overload set can be dependently-typed, but it never
-      // instantiates to having an overloadable type.
-      ExprResult resolvedRHS = CheckPlaceholderExpr(RHSExpr);
-      if (resolvedRHS.isInvalid()) return ExprError();
-      RHSExpr = resolvedRHS.get();
-
-      if (RHSExpr->isTypeDependent() ||
-          RHSExpr->getType()->isOverloadableType())
-        return BuildOverloadedBinOp(*this, S, OpLoc, Opc, LHSExpr, RHSExpr);
-    }
-
-    // If we're instantiating "a.x < b" or "A::x < b" and 'x' names a function
-    // template, diagnose the missing 'template' keyword instead of diagnosing
-    // an invalid use of a bound member function.
-    //
-    // Note that "A::x < b" might be valid if 'b' has an overloadable type due
-    // to C++1z [over.over]/1.4, but we already checked for that case above.
-    if (Opc == BO_LT && inTemplateInstantiation() &&
-        (pty->getKind() == BuiltinType::BoundMember ||
-         pty->getKind() == BuiltinType::Overload)) {
-      auto *OE = dyn_cast<OverloadExpr>(LHSExpr);
-      if (OE && !OE->hasTemplateKeyword() && !OE->hasExplicitTemplateArgs() &&
-          std::any_of(OE->decls_begin(), OE->decls_end(), [](NamedDecl *ND) {
-            return isa<FunctionTemplateDecl>(ND);
-          })) {
-        Diag(OE->getQualifier() ? OE->getQualifierLoc().getBeginLoc()
-                                : OE->getNameLoc(),
-             diag::err_template_kw_missing)
-          << OE->getName().getAsString() << "";
-        return ExprError();
-      }
-    }
-
-    ExprResult LHS = CheckPlaceholderExpr(LHSExpr);
-    if (LHS.isInvalid()) return ExprError();
-    LHSExpr = LHS.get();
-  }
-
-  // Handle pseudo-objects in the RHS.
-  if (const BuiltinType *pty = RHSExpr->getType()->getAsPlaceholderType()) {
-    // An overload in the RHS can potentially be resolved by the type
-    // being assigned to.
-    if (Opc == BO_Assign && pty->getKind() == BuiltinType::Overload) {
-      if (getLangOpts().CPlusPlus &&
-          (LHSExpr->isTypeDependent() || RHSExpr->isTypeDependent() ||
-           LHSExpr->getType()->isOverloadableType()))
-        return BuildOverloadedBinOp(*this, S, OpLoc, Opc, LHSExpr, RHSExpr);
-
-      return CreateBuiltinBinOp(OpLoc, Opc, LHSExpr, RHSExpr);
-    }
-
-    // Don't resolve overloads if the other type is overloadable.
-    if (getLangOpts().CPlusPlus && pty->getKind() == BuiltinType::Overload &&
-        LHSExpr->getType()->isOverloadableType())
-      return BuildOverloadedBinOp(*this, S, OpLoc, Opc, LHSExpr, RHSExpr);
-
-    ExprResult resolvedRHS = CheckPlaceholderExpr(RHSExpr);
-    if (!resolvedRHS.isUsable()) return ExprError();
-    RHSExpr = resolvedRHS.get();
-  }
-
-  if (getLangOpts().CPlusPlus) {
-    // If either expression is type-dependent, always build an
-    // overloaded op.
-    if (LHSExpr->isTypeDependent() || RHSExpr->isTypeDependent())
-      return BuildOverloadedBinOp(*this, S, OpLoc, Opc, LHSExpr, RHSExpr);
-
-    // Otherwise, build an overloaded op if either expression has an
-    // overloadable type.
-    if (LHSExpr->getType()->isOverloadableType() ||
-        RHSExpr->getType()->isOverloadableType())
-      return BuildOverloadedBinOp(*this, S, OpLoc, Opc, LHSExpr, RHSExpr);
-  }
-
-  // Build a built-in binary operation.
-  return CreateBuiltinBinOp(OpLoc, Opc, LHSExpr, RHSExpr);
-}
-
-static bool isOverflowingIntegerType(ASTContext &Ctx, QualType T) {
-  if (T.isNull() || T->isDependentType())
-    return false;
-
-  if (!T->isPromotableIntegerType())
-    return true;
-
-  return Ctx.getIntWidth(T) >= Ctx.getIntWidth(Ctx.IntTy);
-}
-
-ExprResult Sema::CreateBuiltinUnaryOp(SourceLocation OpLoc,
-                                      UnaryOperatorKind Opc,
-                                      Expr *InputExpr) {
-  ExprResult Input = InputExpr;
-  ExprValueKind VK = VK_RValue;
-  ExprObjectKind OK = OK_Ordinary;
-  QualType resultType;
-  bool CanOverflow = false;
-
-  bool ConvertHalfVec = false;
-  if (getLangOpts().OpenCL) {
-    QualType Ty = InputExpr->getType();
-    // The only legal unary operation for atomics is '&'.
-    if ((Opc != UO_AddrOf && Ty->isAtomicType()) ||
-    // OpenCL special types - image, sampler, pipe, and blocks are to be used
-    // only with a builtin functions and therefore should be disallowed here.
-        (Ty->isImageType() || Ty->isSamplerT() || Ty->isPipeType()
-        || Ty->isBlockPointerType())) {
-      return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr)
-                       << InputExpr->getType()
-                       << Input.get()->getSourceRange());
-    }
-  }
-  switch (Opc) {
-  case UO_PreInc:
-  case UO_PreDec:
-  case UO_PostInc:
-  case UO_PostDec:
-    resultType = CheckIncrementDecrementOperand(*this, Input.get(), VK, OK,
-                                                OpLoc,
-                                                Opc == UO_PreInc ||
-                                                Opc == UO_PostInc,
-                                                Opc == UO_PreInc ||
-                                                Opc == UO_PreDec);
-    CanOverflow = isOverflowingIntegerType(Context, resultType);
-    break;
-  case UO_AddrOf:
-    resultType = CheckAddressOfOperand(Input, OpLoc);
-    CheckAddressOfNoDeref(InputExpr);
-    RecordModifiableNonNullParam(*this, InputExpr);
-    break;
-  case UO_Deref: {
-    Input = DefaultFunctionArrayLvalueConversion(Input.get());
-    if (Input.isInvalid()) return ExprError();
-    resultType = CheckIndirectionOperand(*this, Input.get(), VK, OpLoc);
-    break;
-  }
-  case UO_Plus:
-  case UO_Minus:
-    CanOverflow = Opc == UO_Minus &&
-                  isOverflowingIntegerType(Context, Input.get()->getType());
-    Input = UsualUnaryConversions(Input.get());
-    if (Input.isInvalid()) return ExprError();
-    // Unary plus and minus require promoting an operand of half vector to a
-    // float vector and truncating the result back to a half vector. For now, we
-    // do this only when HalfArgsAndReturns is set (that is, when the target is
-    // arm or arm64).
-    ConvertHalfVec =
-        needsConversionOfHalfVec(true, Context, Input.get()->getType());
-
-    // If the operand is a half vector, promote it to a float vector.
-    if (ConvertHalfVec)
-      Input = convertVector(Input.get(), Context.FloatTy, *this);
-    resultType = Input.get()->getType();
-    if (resultType->isDependentType())
-      break;
-    if (resultType->isArithmeticType()) // C99 6.5.3.3p1
-      break;
-    else if (resultType->isVectorType() &&
-             // The z vector extensions don't allow + or - with bool vectors.
-             (!Context.getLangOpts().ZVector ||
-              resultType->getAs<VectorType>()->getVectorKind() !=
-              VectorType::AltiVecBool))
-      break;
-    else if (getLangOpts().CPlusPlus && // C++ [expr.unary.op]p6
-             Opc == UO_Plus &&
-             resultType->isPointerType())
-      break;
-
-    return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr)
-      << resultType << Input.get()->getSourceRange());
-
-  case UO_Not: // bitwise complement
-    Input = UsualUnaryConversions(Input.get());
-    if (Input.isInvalid())
-      return ExprError();
-    resultType = Input.get()->getType();
-
-    if (resultType->isDependentType())
-      break;
-    // C99 6.5.3.3p1. We allow complex int and float as a GCC extension.
-    if (resultType->isComplexType() || resultType->isComplexIntegerType())
-      // C99 does not support '~' for complex conjugation.
-      Diag(OpLoc, diag::ext_integer_complement_complex)
-          << resultType << Input.get()->getSourceRange();
-    else if (resultType->hasIntegerRepresentation())
-      break;
-    else if (resultType->isExtVectorType() && Context.getLangOpts().OpenCL) {
-      // OpenCL v1.1 s6.3.f: The bitwise operator not (~) does not operate
-      // on vector float types.
-      QualType T = resultType->getAs<ExtVectorType>()->getElementType();
-      if (!T->isIntegerType())
-        return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr)
-                          << resultType << Input.get()->getSourceRange());
-    } else {
-      return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr)
-                       << resultType << Input.get()->getSourceRange());
-    }
-    break;
-
-  case UO_LNot: // logical negation
-    // Unlike +/-/~, integer promotions aren't done here (C99 6.5.3.3p5).
-    Input = DefaultFunctionArrayLvalueConversion(Input.get());
-    if (Input.isInvalid()) return ExprError();
-    resultType = Input.get()->getType();
-
-    // Though we still have to promote half FP to float...
-    if (resultType->isHalfType() && !Context.getLangOpts().NativeHalfType) {
-      Input = ImpCastExprToType(Input.get(), Context.FloatTy, CK_FloatingCast).get();
-      resultType = Context.FloatTy;
-    }
-
-    if (resultType->isDependentType())
-      break;
-    if (resultType->isScalarType() && !isScopedEnumerationType(resultType)) {
-      // C99 6.5.3.3p1: ok, fallthrough;
-      if (Context.getLangOpts().CPlusPlus) {
-        // C++03 [expr.unary.op]p8, C++0x [expr.unary.op]p9:
-        // operand contextually converted to bool.
-        Input = ImpCastExprToType(Input.get(), Context.BoolTy,
-                                  ScalarTypeToBooleanCastKind(resultType));
-      } else if (Context.getLangOpts().OpenCL &&
-                 Context.getLangOpts().OpenCLVersion < 120) {
-        // OpenCL v1.1 6.3.h: The logical operator not (!) does not
-        // operate on scalar float types.
-        if (!resultType->isIntegerType() && !resultType->isPointerType())
-          return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr)
-                           << resultType << Input.get()->getSourceRange());
-      }
-    } else if (resultType->isExtVectorType()) {
-      if (Context.getLangOpts().OpenCL &&
-          Context.getLangOpts().OpenCLVersion < 120) {
-        // OpenCL v1.1 6.3.h: The logical operator not (!) does not
-        // operate on vector float types.
-        QualType T = resultType->getAs<ExtVectorType>()->getElementType();
-        if (!T->isIntegerType())
-          return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr)
-                           << resultType << Input.get()->getSourceRange());
-      }
-      // Vector logical not returns the signed variant of the operand type.
-      resultType = GetSignedVectorType(resultType);
-      break;
-    } else {
-      // FIXME: GCC's vector extension permits the usage of '!' with a vector
-      //        type in C++. We should allow that here too.
-      return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr)
-        << resultType << Input.get()->getSourceRange());
-    }
-
-    // LNot always has type int. C99 6.5.3.3p5.
-    // In C++, it's bool. C++ 5.3.1p8
-    resultType = Context.getLogicalOperationType();
-    break;
-  case UO_Real:
-  case UO_Imag:
-    resultType = CheckRealImagOperand(*this, Input, OpLoc, Opc == UO_Real);
-    // _Real maps ordinary l-values into ordinary l-values. _Imag maps ordinary
-    // complex l-values to ordinary l-values and all other values to r-values.
-    if (Input.isInvalid()) return ExprError();
-    if (Opc == UO_Real || Input.get()->getType()->isAnyComplexType()) {
-      if (Input.get()->getValueKind() != VK_RValue &&
-          Input.get()->getObjectKind() == OK_Ordinary)
-        VK = Input.get()->getValueKind();
-    } else if (!getLangOpts().CPlusPlus) {
-      // In C, a volatile scalar is read by __imag. In C++, it is not.
-      Input = DefaultLvalueConversion(Input.get());
-    }
-    break;
-  case UO_Extension:
-    resultType = Input.get()->getType();
-    VK = Input.get()->getValueKind();
-    OK = Input.get()->getObjectKind();
-    break;
-  case UO_Coawait:
-    // It's unnecessary to represent the pass-through operator co_await in the
-    // AST; just return the input expression instead.
-    assert(!Input.get()->getType()->isDependentType() &&
-                   "the co_await expression must be non-dependant before "
-                   "building operator co_await");
-    return Input;
-  }
-  if (resultType.isNull() || Input.isInvalid())
-    return ExprError();
-
-  // Check for array bounds violations in the operand of the UnaryOperator,
-  // except for the '*' and '&' operators that have to be handled specially
-  // by CheckArrayAccess (as there are special cases like &array[arraysize]
-  // that are explicitly defined as valid by the standard).
-  if (Opc != UO_AddrOf && Opc != UO_Deref)
-    CheckArrayAccess(Input.get());
-
-  auto *UO = new (Context)
-      UnaryOperator(Input.get(), Opc, resultType, VK, OK, OpLoc, CanOverflow);
-
-  if (Opc == UO_Deref && UO->getType()->hasAttr(attr::NoDeref) &&
-      !isa<ArrayType>(UO->getType().getDesugaredType(Context)))
-    ExprEvalContexts.back().PossibleDerefs.insert(UO);
-
-  // Convert the result back to a half vector.
-  if (ConvertHalfVec)
-    return convertVector(UO, Context.HalfTy, *this);
-  return UO;
-}
-
-/// Determine whether the given expression is a qualified member
-/// access expression, of a form that could be turned into a pointer to member
-/// with the address-of operator.
-bool Sema::isQualifiedMemberAccess(Expr *E) {
-  if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E)) {
-    if (!DRE->getQualifier())
-      return false;
-
-    ValueDecl *VD = DRE->getDecl();
-    if (!VD->isCXXClassMember())
-      return false;
-
-    if (isa<FieldDecl>(VD) || isa<IndirectFieldDecl>(VD))
-      return true;
-    if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(VD))
-      return Method->isInstance();
-
-    return false;
-  }
-
-  if (UnresolvedLookupExpr *ULE = dyn_cast<UnresolvedLookupExpr>(E)) {
-    if (!ULE->getQualifier())
-      return false;
-
-    for (NamedDecl *D : ULE->decls()) {
-      if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) {
-        if (Method->isInstance())
-          return true;
-      } else {
-        // Overload set does not contain methods.
-        break;
-      }
-    }
-
-    return false;
-  }
-
-  return false;
-}
-
-ExprResult Sema::BuildUnaryOp(Scope *S, SourceLocation OpLoc,
-                              UnaryOperatorKind Opc, Expr *Input) {
-  // First things first: handle placeholders so that the
-  // overloaded-operator check considers the right type.
-  if (const BuiltinType *pty = Input->getType()->getAsPlaceholderType()) {
-    // Increment and decrement of pseudo-object references.
-    if (pty->getKind() == BuiltinType::PseudoObject &&
-        UnaryOperator::isIncrementDecrementOp(Opc))
-      return checkPseudoObjectIncDec(S, OpLoc, Opc, Input);
-
-    // extension is always a builtin operator.
-    if (Opc == UO_Extension)
-      return CreateBuiltinUnaryOp(OpLoc, Opc, Input);
-
-    // & gets special logic for several kinds of placeholder.
-    // The builtin code knows what to do.
-    if (Opc == UO_AddrOf &&
-        (pty->getKind() == BuiltinType::Overload ||
-         pty->getKind() == BuiltinType::UnknownAny ||
-         pty->getKind() == BuiltinType::BoundMember))
-      return CreateBuiltinUnaryOp(OpLoc, Opc, Input);
-
-    // Anything else needs to be handled now.
-    ExprResult Result = CheckPlaceholderExpr(Input);
-    if (Result.isInvalid()) return ExprError();
-    Input = Result.get();
-  }
-
-  if (getLangOpts().CPlusPlus && Input->getType()->isOverloadableType() &&
-      UnaryOperator::getOverloadedOperator(Opc) != OO_None &&
-      !(Opc == UO_AddrOf && isQualifiedMemberAccess(Input))) {
-    // Find all of the overloaded operators visible from this
-    // point. We perform both an operator-name lookup from the local
-    // scope and an argument-dependent lookup based on the types of
-    // the arguments.
-    UnresolvedSet<16> Functions;
-    OverloadedOperatorKind OverOp = UnaryOperator::getOverloadedOperator(Opc);
-    if (S && OverOp != OO_None)
-      LookupOverloadedOperatorName(OverOp, S, Input->getType(), QualType(),
-                                   Functions);
-
-    return CreateOverloadedUnaryOp(OpLoc, Opc, Functions, Input);
-  }
-
-  return CreateBuiltinUnaryOp(OpLoc, Opc, Input);
-}
-
-// Unary Operators.  'Tok' is the token for the operator.
-ExprResult Sema::ActOnUnaryOp(Scope *S, SourceLocation OpLoc,
-                              tok::TokenKind Op, Expr *Input) {
-  return BuildUnaryOp(S, OpLoc, ConvertTokenKindToUnaryOpcode(Op), Input);
-}
-
-/// ActOnAddrLabel - Parse the GNU address of label extension: "&&foo".
-ExprResult Sema::ActOnAddrLabel(SourceLocation OpLoc, SourceLocation LabLoc,
-                                LabelDecl *TheDecl) {
-  TheDecl->markUsed(Context);
-  // Create the AST node.  The address of a label always has type 'void*'.
-  return new (Context) AddrLabelExpr(OpLoc, LabLoc, TheDecl,
-                                     Context.getPointerType(Context.VoidTy));
-}
-
-/// Given the last statement in a statement-expression, check whether
-/// the result is a producing expression (like a call to an
-/// ns_returns_retained function) and, if so, rebuild it to hoist the
-/// release out of the full-expression.  Otherwise, return null.
-/// Cannot fail.
-static Expr *maybeRebuildARCConsumingStmt(Stmt *Statement) {
-  // Should always be wrapped with one of these.
-  ExprWithCleanups *cleanups = dyn_cast<ExprWithCleanups>(Statement);
-  if (!cleanups) return nullptr;
-
-  ImplicitCastExpr *cast = dyn_cast<ImplicitCastExpr>(cleanups->getSubExpr());
-  if (!cast || cast->getCastKind() != CK_ARCConsumeObject)
-    return nullptr;
-
-  // Splice out the cast.  This shouldn't modify any interesting
-  // features of the statement.
-  Expr *producer = cast->getSubExpr();
-  assert(producer->getType() == cast->getType());
-  assert(producer->getValueKind() == cast->getValueKind());
-  cleanups->setSubExpr(producer);
-  return cleanups;
-}
-
-void Sema::ActOnStartStmtExpr() {
-  PushExpressionEvaluationContext(ExprEvalContexts.back().Context);
-}
-
-void Sema::ActOnStmtExprError() {
-  // Note that function is also called by TreeTransform when leaving a
-  // StmtExpr scope without rebuilding anything.
-
-  DiscardCleanupsInEvaluationContext();
-  PopExpressionEvaluationContext();
-}
-
-ExprResult
-Sema::ActOnStmtExpr(SourceLocation LPLoc, Stmt *SubStmt,
-                    SourceLocation RPLoc) { // "({..})"
-  assert(SubStmt && isa<CompoundStmt>(SubStmt) && "Invalid action invocation!");
-  CompoundStmt *Compound = cast<CompoundStmt>(SubStmt);
-
-  if (hasAnyUnrecoverableErrorsInThisFunction())
-    DiscardCleanupsInEvaluationContext();
-  assert(!Cleanup.exprNeedsCleanups() &&
-         "cleanups within StmtExpr not correctly bound!");
-  PopExpressionEvaluationContext();
-
-  // FIXME: there are a variety of strange constraints to enforce here, for
-  // example, it is not possible to goto into a stmt expression apparently.
-  // More semantic analysis is needed.
-
-  // If there are sub-stmts in the compound stmt, take the type of the last one
-  // as the type of the stmtexpr.
-  QualType Ty = Context.VoidTy;
-  bool StmtExprMayBindToTemp = false;
-  if (!Compound->body_empty()) {
-    Stmt *LastStmt = Compound->body_back();
-    LabelStmt *LastLabelStmt = nullptr;
-    // If LastStmt is a label, skip down through into the body.
-    while (LabelStmt *Label = dyn_cast<LabelStmt>(LastStmt)) {
-      LastLabelStmt = Label;
-      LastStmt = Label->getSubStmt();
-    }
-
-    if (Expr *LastE = dyn_cast<Expr>(LastStmt)) {
-      // Do function/array conversion on the last expression, but not
-      // lvalue-to-rvalue.  However, initialize an unqualified type.
-      ExprResult LastExpr = DefaultFunctionArrayConversion(LastE);
-      if (LastExpr.isInvalid())
-        return ExprError();
-      Ty = LastExpr.get()->getType().getUnqualifiedType();
-
-      if (!Ty->isDependentType() && !LastExpr.get()->isTypeDependent()) {
-        // In ARC, if the final expression ends in a consume, splice
-        // the consume out and bind it later.  In the alternate case
-        // (when dealing with a retainable type), the result
-        // initialization will create a produce.  In both cases the
-        // result will be +1, and we'll need to balance that out with
-        // a bind.
-        if (Expr *rebuiltLastStmt
-              = maybeRebuildARCConsumingStmt(LastExpr.get())) {
-          LastExpr = rebuiltLastStmt;
-        } else {
-          LastExpr = PerformCopyInitialization(
-              InitializedEntity::InitializeStmtExprResult(LPLoc, Ty),
-              SourceLocation(), LastExpr);
-        }
-
-        if (LastExpr.isInvalid())
-          return ExprError();
-        if (LastExpr.get() != nullptr) {
-          if (!LastLabelStmt)
-            Compound->setLastStmt(LastExpr.get());
-          else
-            LastLabelStmt->setSubStmt(LastExpr.get());
-          StmtExprMayBindToTemp = true;
-        }
-      }
-    }
-  }
-
-  // FIXME: Check that expression type is complete/non-abstract; statement
-  // expressions are not lvalues.
-  Expr *ResStmtExpr = new (Context) StmtExpr(Compound, Ty, LPLoc, RPLoc);
-  if (StmtExprMayBindToTemp)
-    return MaybeBindToTemporary(ResStmtExpr);
-  return ResStmtExpr;
-}
-
-ExprResult Sema::BuildBuiltinOffsetOf(SourceLocation BuiltinLoc,
-                                      TypeSourceInfo *TInfo,
-                                      ArrayRef<OffsetOfComponent> Components,
-                                      SourceLocation RParenLoc) {
-  QualType ArgTy = TInfo->getType();
-  bool Dependent = ArgTy->isDependentType();
-  SourceRange TypeRange = TInfo->getTypeLoc().getLocalSourceRange();
-
-  // We must have at least one component that refers to the type, and the first
-  // one is known to be a field designator.  Verify that the ArgTy represents
-  // a struct/union/class.
-  if (!Dependent && !ArgTy->isRecordType())
-    return ExprError(Diag(BuiltinLoc, diag::err_offsetof_record_type)
-                       << ArgTy << TypeRange);
-
-  // Type must be complete per C99 7.17p3 because a declaring a variable
-  // with an incomplete type would be ill-formed.
-  if (!Dependent
-      && RequireCompleteType(BuiltinLoc, ArgTy,
-                             diag::err_offsetof_incomplete_type, TypeRange))
-    return ExprError();
-
-  bool DidWarnAboutNonPOD = false;
-  QualType CurrentType = ArgTy;
-  SmallVector<OffsetOfNode, 4> Comps;
-  SmallVector<Expr*, 4> Exprs;
-  for (const OffsetOfComponent &OC : Components) {
-    if (OC.isBrackets) {
-      // Offset of an array sub-field.  TODO: Should we allow vector elements?
-      if (!CurrentType->isDependentType()) {
-        const ArrayType *AT = Context.getAsArrayType(CurrentType);
-        if(!AT)
-          return ExprError(Diag(OC.LocEnd, diag::err_offsetof_array_type)
-                           << CurrentType);
-        CurrentType = AT->getElementType();
-      } else
-        CurrentType = Context.DependentTy;
-
-      ExprResult IdxRval = DefaultLvalueConversion(static_cast<Expr*>(OC.U.E));
-      if (IdxRval.isInvalid())
-        return ExprError();
-      Expr *Idx = IdxRval.get();
-
-      // The expression must be an integral expression.
-      // FIXME: An integral constant expression?
-      if (!Idx->isTypeDependent() && !Idx->isValueDependent() &&
-          !Idx->getType()->isIntegerType())
-        return ExprError(
-            Diag(Idx->getBeginLoc(), diag::err_typecheck_subscript_not_integer)
-            << Idx->getSourceRange());
-
-      // Record this array index.
-      Comps.push_back(OffsetOfNode(OC.LocStart, Exprs.size(), OC.LocEnd));
-      Exprs.push_back(Idx);
-      continue;
-    }
-
-    // Offset of a field.
-    if (CurrentType->isDependentType()) {
-      // We have the offset of a field, but we can't look into the dependent
-      // type. Just record the identifier of the field.
-      Comps.push_back(OffsetOfNode(OC.LocStart, OC.U.IdentInfo, OC.LocEnd));
-      CurrentType = Context.DependentTy;
-      continue;
-    }
-
-    // We need to have a complete type to look into.
-    if (RequireCompleteType(OC.LocStart, CurrentType,
-                            diag::err_offsetof_incomplete_type))
-      return ExprError();
-
-    // Look for the designated field.
-    const RecordType *RC = CurrentType->getAs<RecordType>();
-    if (!RC)
-      return ExprError(Diag(OC.LocEnd, diag::err_offsetof_record_type)
-                       << CurrentType);
-    RecordDecl *RD = RC->getDecl();
-
-    // C++ [lib.support.types]p5:
-    //   The macro offsetof accepts a restricted set of type arguments in this
-    //   International Standard. type shall be a POD structure or a POD union
-    //   (clause 9).
-    // C++11 [support.types]p4:
-    //   If type is not a standard-layout class (Clause 9), the results are
-    //   undefined.
-    if (CXXRecordDecl *CRD = dyn_cast<CXXRecordDecl>(RD)) {
-      bool IsSafe = LangOpts.CPlusPlus11? CRD->isStandardLayout() : CRD->isPOD();
-      unsigned DiagID =
-        LangOpts.CPlusPlus11? diag::ext_offsetof_non_standardlayout_type
-                            : diag::ext_offsetof_non_pod_type;
-
-      if (!IsSafe && !DidWarnAboutNonPOD &&
-          DiagRuntimeBehavior(BuiltinLoc, nullptr,
-                              PDiag(DiagID)
-                              << SourceRange(Components[0].LocStart, OC.LocEnd)
-                              << CurrentType))
-        DidWarnAboutNonPOD = true;
-    }
-
-    // Look for the field.
-    LookupResult R(*this, OC.U.IdentInfo, OC.LocStart, LookupMemberName);
-    LookupQualifiedName(R, RD);
-    FieldDecl *MemberDecl = R.getAsSingle<FieldDecl>();
-    IndirectFieldDecl *IndirectMemberDecl = nullptr;
-    if (!MemberDecl) {
-      if ((IndirectMemberDecl = R.getAsSingle<IndirectFieldDecl>()))
-        MemberDecl = IndirectMemberDecl->getAnonField();
-    }
-
-    if (!MemberDecl)
-      return ExprError(Diag(BuiltinLoc, diag::err_no_member)
-                       << OC.U.IdentInfo << RD << SourceRange(OC.LocStart,
-                                                              OC.LocEnd));
-
-    // C99 7.17p3:
-    //   (If the specified member is a bit-field, the behavior is undefined.)
-    //
-    // We diagnose this as an error.
-    if (MemberDecl->isBitField()) {
-      Diag(OC.LocEnd, diag::err_offsetof_bitfield)
-        << MemberDecl->getDeclName()
-        << SourceRange(BuiltinLoc, RParenLoc);
-      Diag(MemberDecl->getLocation(), diag::note_bitfield_decl);
-      return ExprError();
-    }
-
-    RecordDecl *Parent = MemberDecl->getParent();
-    if (IndirectMemberDecl)
-      Parent = cast<RecordDecl>(IndirectMemberDecl->getDeclContext());
-
-    // If the member was found in a base class, introduce OffsetOfNodes for
-    // the base class indirections.
-    CXXBasePaths Paths;
-    if (IsDerivedFrom(OC.LocStart, CurrentType, Context.getTypeDeclType(Parent),
-                      Paths)) {
-      if (Paths.getDetectedVirtual()) {
-        Diag(OC.LocEnd, diag::err_offsetof_field_of_virtual_base)
-          << MemberDecl->getDeclName()
-          << SourceRange(BuiltinLoc, RParenLoc);
-        return ExprError();
-      }
-
-      CXXBasePath &Path = Paths.front();
-      for (const CXXBasePathElement &B : Path)
-        Comps.push_back(OffsetOfNode(B.Base));
-    }
-
-    if (IndirectMemberDecl) {
-      for (auto *FI : IndirectMemberDecl->chain()) {
-        assert(isa<FieldDecl>(FI));
-        Comps.push_back(OffsetOfNode(OC.LocStart,
-                                     cast<FieldDecl>(FI), OC.LocEnd));
-      }
-    } else
-      Comps.push_back(OffsetOfNode(OC.LocStart, MemberDecl, OC.LocEnd));
-
-    CurrentType = MemberDecl->getType().getNonReferenceType();
-  }
-
-  return OffsetOfExpr::Create(Context, Context.getSizeType(), BuiltinLoc, TInfo,
-                              Comps, Exprs, RParenLoc);
-}
-
-ExprResult Sema::ActOnBuiltinOffsetOf(Scope *S,
-                                      SourceLocation BuiltinLoc,
-                                      SourceLocation TypeLoc,
-                                      ParsedType ParsedArgTy,
-                                      ArrayRef<OffsetOfComponent> Components,
-                                      SourceLocation RParenLoc) {
-
-  TypeSourceInfo *ArgTInfo;
-  QualType ArgTy = GetTypeFromParser(ParsedArgTy, &ArgTInfo);
-  if (ArgTy.isNull())
-    return ExprError();
-
-  if (!ArgTInfo)
-    ArgTInfo = Context.getTrivialTypeSourceInfo(ArgTy, TypeLoc);
-
-  return BuildBuiltinOffsetOf(BuiltinLoc, ArgTInfo, Components, RParenLoc);
-}
-
-
-ExprResult Sema::ActOnChooseExpr(SourceLocation BuiltinLoc,
-                                 Expr *CondExpr,
-                                 Expr *LHSExpr, Expr *RHSExpr,
-                                 SourceLocation RPLoc) {
-  assert((CondExpr && LHSExpr && RHSExpr) && "Missing type argument(s)");
-
-  ExprValueKind VK = VK_RValue;
-  ExprObjectKind OK = OK_Ordinary;
-  QualType resType;
-  bool ValueDependent = false;
-  bool CondIsTrue = false;
-  if (CondExpr->isTypeDependent() || CondExpr->isValueDependent()) {
-    resType = Context.DependentTy;
-    ValueDependent = true;
-  } else {
-    // The conditional expression is required to be a constant expression.
-    llvm::APSInt condEval(32);
-    ExprResult CondICE
-      = VerifyIntegerConstantExpression(CondExpr, &condEval,
-          diag::err_typecheck_choose_expr_requires_constant, false);
-    if (CondICE.isInvalid())
-      return ExprError();
-    CondExpr = CondICE.get();
-    CondIsTrue = condEval.getZExtValue();
-
-    // If the condition is > zero, then the AST type is the same as the LHSExpr.
-    Expr *ActiveExpr = CondIsTrue ? LHSExpr : RHSExpr;
-
-    resType = ActiveExpr->getType();
-    ValueDependent = ActiveExpr->isValueDependent();
-    VK = ActiveExpr->getValueKind();
-    OK = ActiveExpr->getObjectKind();
-  }
-
-  return new (Context)
-      ChooseExpr(BuiltinLoc, CondExpr, LHSExpr, RHSExpr, resType, VK, OK, RPLoc,
-                 CondIsTrue, resType->isDependentType(), ValueDependent);
-}
-
-//===----------------------------------------------------------------------===//
-// Clang Extensions.
-//===----------------------------------------------------------------------===//
-
-/// ActOnBlockStart - This callback is invoked when a block literal is started.
-void Sema::ActOnBlockStart(SourceLocation CaretLoc, Scope *CurScope) {
-  BlockDecl *Block = BlockDecl::Create(Context, CurContext, CaretLoc);
-
-  if (LangOpts.CPlusPlus) {
-    Decl *ManglingContextDecl;
-    if (MangleNumberingContext *MCtx =
-            getCurrentMangleNumberContext(Block->getDeclContext(),
-                                          ManglingContextDecl)) {
-      unsigned ManglingNumber = MCtx->getManglingNumber(Block);
-      Block->setBlockMangling(ManglingNumber, ManglingContextDecl);
-    }
-  }
-
-  PushBlockScope(CurScope, Block);
-  CurContext->addDecl(Block);
-  if (CurScope)
-    PushDeclContext(CurScope, Block);
-  else
-    CurContext = Block;
-
-  getCurBlock()->HasImplicitReturnType = true;
-
-  // Enter a new evaluation context to insulate the block from any
-  // cleanups from the enclosing full-expression.
-  PushExpressionEvaluationContext(
-      ExpressionEvaluationContext::PotentiallyEvaluated);
-}
-
-void Sema::ActOnBlockArguments(SourceLocation CaretLoc, Declarator &ParamInfo,
-                               Scope *CurScope) {
-  assert(ParamInfo.getIdentifier() == nullptr &&
-         "block-id should have no identifier!");
-  assert(ParamInfo.getContext() == DeclaratorContext::BlockLiteralContext);
-  BlockScopeInfo *CurBlock = getCurBlock();
-
-  TypeSourceInfo *Sig = GetTypeForDeclarator(ParamInfo, CurScope);
-  QualType T = Sig->getType();
-
-  // FIXME: We should allow unexpanded parameter packs here, but that would,
-  // in turn, make the block expression contain unexpanded parameter packs.
-  if (DiagnoseUnexpandedParameterPack(CaretLoc, Sig, UPPC_Block)) {
-    // Drop the parameters.
-    FunctionProtoType::ExtProtoInfo EPI;
-    EPI.HasTrailingReturn = false;
-    EPI.TypeQuals.addConst();
-    T = Context.getFunctionType(Context.DependentTy, None, EPI);
-    Sig = Context.getTrivialTypeSourceInfo(T);
-  }
-
-  // GetTypeForDeclarator always produces a function type for a block
-  // literal signature.  Furthermore, it is always a FunctionProtoType
-  // unless the function was written with a typedef.
-  assert(T->isFunctionType() &&
-         "GetTypeForDeclarator made a non-function block signature");
-
-  // Look for an explicit signature in that function type.
-  FunctionProtoTypeLoc ExplicitSignature;
-
-  if ((ExplicitSignature =
-           Sig->getTypeLoc().getAsAdjusted<FunctionProtoTypeLoc>())) {
-
-    // Check whether that explicit signature was synthesized by
-    // GetTypeForDeclarator.  If so, don't save that as part of the
-    // written signature.
-    if (ExplicitSignature.getLocalRangeBegin() ==
-        ExplicitSignature.getLocalRangeEnd()) {
-      // This would be much cheaper if we stored TypeLocs instead of
-      // TypeSourceInfos.
-      TypeLoc Result = ExplicitSignature.getReturnLoc();
-      unsigned Size = Result.getFullDataSize();
-      Sig = Context.CreateTypeSourceInfo(Result.getType(), Size);
-      Sig->getTypeLoc().initializeFullCopy(Result, Size);
-
-      ExplicitSignature = FunctionProtoTypeLoc();
-    }
-  }
-
-  CurBlock->TheDecl->setSignatureAsWritten(Sig);
-  CurBlock->FunctionType = T;
-
-  const FunctionType *Fn = T->getAs<FunctionType>();
-  QualType RetTy = Fn->getReturnType();
-  bool isVariadic =
-    (isa<FunctionProtoType>(Fn) && cast<FunctionProtoType>(Fn)->isVariadic());
-
-  CurBlock->TheDecl->setIsVariadic(isVariadic);
-
-  // Context.DependentTy is used as a placeholder for a missing block
-  // return type.  TODO:  what should we do with declarators like:
-  //   ^ * { ... }
-  // If the answer is "apply template argument deduction"....
-  if (RetTy != Context.DependentTy) {
-    CurBlock->ReturnType = RetTy;
-    CurBlock->TheDecl->setBlockMissingReturnType(false);
-    CurBlock->HasImplicitReturnType = false;
-  }
-
-  // Push block parameters from the declarator if we had them.
-  SmallVector<ParmVarDecl*, 8> Params;
-  if (ExplicitSignature) {
-    for (unsigned I = 0, E = ExplicitSignature.getNumParams(); I != E; ++I) {
-      ParmVarDecl *Param = ExplicitSignature.getParam(I);
-      if (Param->getIdentifier() == nullptr &&
-          !Param->isImplicit() &&
-          !Param->isInvalidDecl() &&
-          !getLangOpts().CPlusPlus)
-        Diag(Param->getLocation(), diag::err_parameter_name_omitted);
-      Params.push_back(Param);
-    }
-
-  // Fake up parameter variables if we have a typedef, like
-  //   ^ fntype { ... }
-  } else if (const FunctionProtoType *Fn = T->getAs<FunctionProtoType>()) {
-    for (const auto &I : Fn->param_types()) {
-      ParmVarDecl *Param = BuildParmVarDeclForTypedef(
-          CurBlock->TheDecl, ParamInfo.getBeginLoc(), I);
-      Params.push_back(Param);
-    }
-  }
-
-  // Set the parameters on the block decl.
-  if (!Params.empty()) {
-    CurBlock->TheDecl->setParams(Params);
-    CheckParmsForFunctionDef(CurBlock->TheDecl->parameters(),
-                             /*CheckParameterNames=*/false);
-  }
-
-  // Finally we can process decl attributes.
-  ProcessDeclAttributes(CurScope, CurBlock->TheDecl, ParamInfo);
-
-  // Put the parameter variables in scope.
-  for (auto AI : CurBlock->TheDecl->parameters()) {
-    AI->setOwningFunction(CurBlock->TheDecl);
-
-    // If this has an identifier, add it to the scope stack.
-    if (AI->getIdentifier()) {
-      CheckShadow(CurBlock->TheScope, AI);
-
-      PushOnScopeChains(AI, CurBlock->TheScope);
-    }
-  }
-}
-
-/// ActOnBlockError - If there is an error parsing a block, this callback
-/// is invoked to pop the information about the block from the action impl.
-void Sema::ActOnBlockError(SourceLocation CaretLoc, Scope *CurScope) {
-  // Leave the expression-evaluation context.
-  DiscardCleanupsInEvaluationContext();
-  PopExpressionEvaluationContext();
-
-  // Pop off CurBlock, handle nested blocks.
-  PopDeclContext();
-  PopFunctionScopeInfo();
-}
-
-/// ActOnBlockStmtExpr - This is called when the body of a block statement
-/// literal was successfully completed.  ^(int x){...}
-ExprResult Sema::ActOnBlockStmtExpr(SourceLocation CaretLoc,
-                                    Stmt *Body, Scope *CurScope) {
-  // If blocks are disabled, emit an error.
-  if (!LangOpts.Blocks)
-    Diag(CaretLoc, diag::err_blocks_disable) << LangOpts.OpenCL;
-
-  // Leave the expression-evaluation context.
-  if (hasAnyUnrecoverableErrorsInThisFunction())
-    DiscardCleanupsInEvaluationContext();
-  assert(!Cleanup.exprNeedsCleanups() &&
-         "cleanups within block not correctly bound!");
-  PopExpressionEvaluationContext();
-
-  BlockScopeInfo *BSI = cast<BlockScopeInfo>(FunctionScopes.back());
-  BlockDecl *BD = BSI->TheDecl;
-
-  if (BSI->HasImplicitReturnType)
-    deduceClosureReturnType(*BSI);
-
-  PopDeclContext();
-
-  QualType RetTy = Context.VoidTy;
-  if (!BSI->ReturnType.isNull())
-    RetTy = BSI->ReturnType;
-
-  bool NoReturn = BD->hasAttr<NoReturnAttr>();
-  QualType BlockTy;
-
-  // Set the captured variables on the block.
-  // FIXME: Share capture structure between BlockDecl and CapturingScopeInfo!
-  SmallVector<BlockDecl::Capture, 4> Captures;
-  for (Capture &Cap : BSI->Captures) {
-    if (Cap.isThisCapture())
-      continue;
-    BlockDecl::Capture NewCap(Cap.getVariable(), Cap.isBlockCapture(),
-                              Cap.isNested(), Cap.getInitExpr());
-    Captures.push_back(NewCap);
-  }
-  BD->setCaptures(Context, Captures, BSI->CXXThisCaptureIndex != 0);
-
-  // If the user wrote a function type in some form, try to use that.
-  if (!BSI->FunctionType.isNull()) {
-    const FunctionType *FTy = BSI->FunctionType->getAs<FunctionType>();
-
-    FunctionType::ExtInfo Ext = FTy->getExtInfo();
-    if (NoReturn && !Ext.getNoReturn()) Ext = Ext.withNoReturn(true);
-
-    // Turn protoless block types into nullary block types.
-    if (isa<FunctionNoProtoType>(FTy)) {
-      FunctionProtoType::ExtProtoInfo EPI;
-      EPI.ExtInfo = Ext;
-      BlockTy = Context.getFunctionType(RetTy, None, EPI);
-
-    // Otherwise, if we don't need to change anything about the function type,
-    // preserve its sugar structure.
-    } else if (FTy->getReturnType() == RetTy &&
-               (!NoReturn || FTy->getNoReturnAttr())) {
-      BlockTy = BSI->FunctionType;
-
-    // Otherwise, make the minimal modifications to the function type.
-    } else {
-      const FunctionProtoType *FPT = cast<FunctionProtoType>(FTy);
-      FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo();
-      EPI.TypeQuals = Qualifiers();
-      EPI.ExtInfo = Ext;
-      BlockTy = Context.getFunctionType(RetTy, FPT->getParamTypes(), EPI);
-    }
-
-  // If we don't have a function type, just build one from nothing.
-  } else {
-    FunctionProtoType::ExtProtoInfo EPI;
-    EPI.ExtInfo = FunctionType::ExtInfo().withNoReturn(NoReturn);
-    BlockTy = Context.getFunctionType(RetTy, None, EPI);
-  }
-
-  DiagnoseUnusedParameters(BD->parameters());
-  BlockTy = Context.getBlockPointerType(BlockTy);
-
-  // If needed, diagnose invalid gotos and switches in the block.
-  if (getCurFunction()->NeedsScopeChecking() &&
-      !PP.isCodeCompletionEnabled())
-    DiagnoseInvalidJumps(cast<CompoundStmt>(Body));
-
-  BD->setBody(cast<CompoundStmt>(Body));
-
-  if (Body && getCurFunction()->HasPotentialAvailabilityViolations)
-    DiagnoseUnguardedAvailabilityViolations(BD);
-
-  // Try to apply the named return value optimization. We have to check again
-  // if we can do this, though, because blocks keep return statements around
-  // to deduce an implicit return type.
-  if (getLangOpts().CPlusPlus && RetTy->isRecordType() &&
-      !BD->isDependentContext())
-    computeNRVO(Body, BSI);
-
-  BlockExpr *Result = new (Context) BlockExpr(BD, BlockTy);
-  AnalysisBasedWarnings::Policy WP = AnalysisWarnings.getDefaultPolicy();
-  PopFunctionScopeInfo(&WP, Result->getBlockDecl(), Result);
-
-  // If the block isn't obviously global, i.e. it captures anything at
-  // all, then we need to do a few things in the surrounding context:
-  if (Result->getBlockDecl()->hasCaptures()) {
-    // First, this expression has a new cleanup object.
-    ExprCleanupObjects.push_back(Result->getBlockDecl());
-    Cleanup.setExprNeedsCleanups(true);
-
-    // It also gets a branch-protected scope if any of the captured
-    // variables needs destruction.
-    for (const auto &CI : Result->getBlockDecl()->captures()) {
-      const VarDecl *var = CI.getVariable();
-      if (var->getType().isDestructedType() != QualType::DK_none) {
-        setFunctionHasBranchProtectedScope();
-        break;
-      }
-    }
-  }
-
-  if (getCurFunction())
-    getCurFunction()->addBlock(BD);
-
-  return Result;
-}
-
-ExprResult Sema::ActOnVAArg(SourceLocation BuiltinLoc, Expr *E, ParsedType Ty,
-                            SourceLocation RPLoc) {
-  TypeSourceInfo *TInfo;
-  GetTypeFromParser(Ty, &TInfo);
-  return BuildVAArgExpr(BuiltinLoc, E, TInfo, RPLoc);
-}
-
-ExprResult Sema::BuildVAArgExpr(SourceLocation BuiltinLoc,
-                                Expr *E, TypeSourceInfo *TInfo,
-                                SourceLocation RPLoc) {
-  Expr *OrigExpr = E;
-  bool IsMS = false;
-
-  // CUDA device code does not support varargs.
-  if (getLangOpts().CUDA && getLangOpts().CUDAIsDevice) {
-    if (const FunctionDecl *F = dyn_cast<FunctionDecl>(CurContext)) {
-      CUDAFunctionTarget T = IdentifyCUDATarget(F);
-      if (T == CFT_Global || T == CFT_Device || T == CFT_HostDevice)
-        return ExprError(Diag(E->getBeginLoc(), diag::err_va_arg_in_device));
-    }
-  }
-
-  // It might be a __builtin_ms_va_list. (But don't ever mark a va_arg()
-  // as Microsoft ABI on an actual Microsoft platform, where
-  // __builtin_ms_va_list and __builtin_va_list are the same.)
-  if (!E->isTypeDependent() && Context.getTargetInfo().hasBuiltinMSVaList() &&
-      Context.getTargetInfo().getBuiltinVaListKind() != TargetInfo::CharPtrBuiltinVaList) {
-    QualType MSVaListType = Context.getBuiltinMSVaListType();
-    if (Context.hasSameType(MSVaListType, E->getType())) {
-      if (CheckForModifiableLvalue(E, BuiltinLoc, *this))
-        return ExprError();
-      IsMS = true;
-    }
-  }
-
-  // Get the va_list type
-  QualType VaListType = Context.getBuiltinVaListType();
-  if (!IsMS) {
-    if (VaListType->isArrayType()) {
-      // Deal with implicit array decay; for example, on x86-64,
-      // va_list is an array, but it's supposed to decay to
-      // a pointer for va_arg.
-      VaListType = Context.getArrayDecayedType(VaListType);
-      // Make sure the input expression also decays appropriately.
-      ExprResult Result = UsualUnaryConversions(E);
-      if (Result.isInvalid())
-        return ExprError();
-      E = Result.get();
-    } else if (VaListType->isRecordType() && getLangOpts().CPlusPlus) {
-      // If va_list is a record type and we are compiling in C++ mode,
-      // check the argument using reference binding.
-      InitializedEntity Entity = InitializedEntity::InitializeParameter(
-          Context, Context.getLValueReferenceType(VaListType), false);
-      ExprResult Init = PerformCopyInitialization(Entity, SourceLocation(), E);
-      if (Init.isInvalid())
-        return ExprError();
-      E = Init.getAs<Expr>();
-    } else {
-      // Otherwise, the va_list argument must be an l-value because
-      // it is modified by va_arg.
-      if (!E->isTypeDependent() &&
-          CheckForModifiableLvalue(E, BuiltinLoc, *this))
-        return ExprError();
-    }
-  }
-
-  if (!IsMS && !E->isTypeDependent() &&
-      !Context.hasSameType(VaListType, E->getType()))
-    return ExprError(
-        Diag(E->getBeginLoc(),
-             diag::err_first_argument_to_va_arg_not_of_type_va_list)
-        << OrigExpr->getType() << E->getSourceRange());
-
-  if (!TInfo->getType()->isDependentType()) {
-    if (RequireCompleteType(TInfo->getTypeLoc().getBeginLoc(), TInfo->getType(),
-                            diag::err_second_parameter_to_va_arg_incomplete,
-                            TInfo->getTypeLoc()))
-      return ExprError();
-
-    if (RequireNonAbstractType(TInfo->getTypeLoc().getBeginLoc(),
-                               TInfo->getType(),
-                               diag::err_second_parameter_to_va_arg_abstract,
-                               TInfo->getTypeLoc()))
-      return ExprError();
-
-    if (!TInfo->getType().isPODType(Context)) {
-      Diag(TInfo->getTypeLoc().getBeginLoc(),
-           TInfo->getType()->isObjCLifetimeType()
-             ? diag::warn_second_parameter_to_va_arg_ownership_qualified
-             : diag::warn_second_parameter_to_va_arg_not_pod)
-        << TInfo->getType()
-        << TInfo->getTypeLoc().getSourceRange();
-    }
-
-    // Check for va_arg where arguments of the given type will be promoted
-    // (i.e. this va_arg is guaranteed to have undefined behavior).
-    QualType PromoteType;
-    if (TInfo->getType()->isPromotableIntegerType()) {
-      PromoteType = Context.getPromotedIntegerType(TInfo->getType());
-      if (Context.typesAreCompatible(PromoteType, TInfo->getType()))
-        PromoteType = QualType();
-    }
-    if (TInfo->getType()->isSpecificBuiltinType(BuiltinType::Float))
-      PromoteType = Context.DoubleTy;
-    if (!PromoteType.isNull())
-      DiagRuntimeBehavior(TInfo->getTypeLoc().getBeginLoc(), E,
-                  PDiag(diag::warn_second_parameter_to_va_arg_never_compatible)
-                          << TInfo->getType()
-                          << PromoteType
-                          << TInfo->getTypeLoc().getSourceRange());
-  }
-
-  QualType T = TInfo->getType().getNonLValueExprType(Context);
-  return new (Context) VAArgExpr(BuiltinLoc, E, TInfo, RPLoc, T, IsMS);
-}
-
-ExprResult Sema::ActOnGNUNullExpr(SourceLocation TokenLoc) {
-  // The type of __null will be int or long, depending on the size of
-  // pointers on the target.
-  QualType Ty;
-  unsigned pw = Context.getTargetInfo().getPointerWidth(0);
-  if (pw == Context.getTargetInfo().getIntWidth())
-    Ty = Context.IntTy;
-  else if (pw == Context.getTargetInfo().getLongWidth())
-    Ty = Context.LongTy;
-  else if (pw == Context.getTargetInfo().getLongLongWidth())
-    Ty = Context.LongLongTy;
-  else {
-    llvm_unreachable("I don't know size of pointer!");
-  }
-
-  return new (Context) GNUNullExpr(Ty, TokenLoc);
-}
-
-bool Sema::ConversionToObjCStringLiteralCheck(QualType DstType, Expr *&Exp,
-                                              bool Diagnose) {
-  if (!getLangOpts().ObjC)
-    return false;
-
-  const ObjCObjectPointerType *PT = DstType->getAs<ObjCObjectPointerType>();
-  if (!PT)
-    return false;
-
-  if (!PT->isObjCIdType()) {
-    // Check if the destination is the 'NSString' interface.
-    const ObjCInterfaceDecl *ID = PT->getInterfaceDecl();
-    if (!ID || !ID->getIdentifier()->isStr("NSString"))
-      return false;
-  }
-
-  // Ignore any parens, implicit casts (should only be
-  // array-to-pointer decays), and not-so-opaque values.  The last is
-  // important for making this trigger for property assignments.
-  Expr *SrcExpr = Exp->IgnoreParenImpCasts();
-  if (OpaqueValueExpr *OV = dyn_cast<OpaqueValueExpr>(SrcExpr))
-    if (OV->getSourceExpr())
-      SrcExpr = OV->getSourceExpr()->IgnoreParenImpCasts();
-
-  StringLiteral *SL = dyn_cast<StringLiteral>(SrcExpr);
-  if (!SL || !SL->isAscii())
-    return false;
-  if (Diagnose) {
-    Diag(SL->getBeginLoc(), diag::err_missing_atsign_prefix)
-        << FixItHint::CreateInsertion(SL->getBeginLoc(), "@");
-    Exp = BuildObjCStringLiteral(SL->getBeginLoc(), SL).get();
-  }
-  return true;
-}
-
-static bool maybeDiagnoseAssignmentToFunction(Sema &S, QualType DstType,
-                                              const Expr *SrcExpr) {
-  if (!DstType->isFunctionPointerType() ||
-      !SrcExpr->getType()->isFunctionType())
-    return false;
-
-  auto *DRE = dyn_cast<DeclRefExpr>(SrcExpr->IgnoreParenImpCasts());
-  if (!DRE)
-    return false;
-
-  auto *FD = dyn_cast<FunctionDecl>(DRE->getDecl());
-  if (!FD)
-    return false;
-
-  return !S.checkAddressOfFunctionIsAvailable(FD,
-                                              /*Complain=*/true,
-                                              SrcExpr->getBeginLoc());
-}
-
-bool Sema::DiagnoseAssignmentResult(AssignConvertType ConvTy,
-                                    SourceLocation Loc,
-                                    QualType DstType, QualType SrcType,
-                                    Expr *SrcExpr, AssignmentAction Action,
-                                    bool *Complained) {
-  if (Complained)
-    *Complained = false;
-
-  // Decode the result (notice that AST's are still created for extensions).
-  bool CheckInferredResultType = false;
-  bool isInvalid = false;
-  unsigned DiagKind = 0;
-  FixItHint Hint;
-  ConversionFixItGenerator ConvHints;
-  bool MayHaveConvFixit = false;
-  bool MayHaveFunctionDiff = false;
-  const ObjCInterfaceDecl *IFace = nullptr;
-  const ObjCProtocolDecl *PDecl = nullptr;
-
-  switch (ConvTy) {
-  case Compatible:
-      DiagnoseAssignmentEnum(DstType, SrcType, SrcExpr);
-      return false;
-
-  case PointerToInt:
-    DiagKind = diag::ext_typecheck_convert_pointer_int;
-    ConvHints.tryToFixConversion(SrcExpr, SrcType, DstType, *this);
-    MayHaveConvFixit = true;
-    break;
-  case IntToPointer:
-    DiagKind = diag::ext_typecheck_convert_int_pointer;
-    ConvHints.tryToFixConversion(SrcExpr, SrcType, DstType, *this);
-    MayHaveConvFixit = true;
-    break;
-  case IncompatiblePointer:
-    if (Action == AA_Passing_CFAudited)
-      DiagKind = diag::err_arc_typecheck_convert_incompatible_pointer;
-    else if (SrcType->isFunctionPointerType() &&
-             DstType->isFunctionPointerType())
-      DiagKind = diag::ext_typecheck_convert_incompatible_function_pointer;
-    else
-      DiagKind = diag::ext_typecheck_convert_incompatible_pointer;
-
-    CheckInferredResultType = DstType->isObjCObjectPointerType() &&
-      SrcType->isObjCObjectPointerType();
-    if (Hint.isNull() && !CheckInferredResultType) {
-      ConvHints.tryToFixConversion(SrcExpr, SrcType, DstType, *this);
-    }
-    else if (CheckInferredResultType) {
-      SrcType = SrcType.getUnqualifiedType();
-      DstType = DstType.getUnqualifiedType();
-    }
-    MayHaveConvFixit = true;
-    break;
-  case IncompatiblePointerSign:
-    DiagKind = diag::ext_typecheck_convert_incompatible_pointer_sign;
-    break;
-  case FunctionVoidPointer:
-    DiagKind = diag::ext_typecheck_convert_pointer_void_func;
-    break;
-  case IncompatiblePointerDiscardsQualifiers: {
-    // Perform array-to-pointer decay if necessary.
-    if (SrcType->isArrayType()) SrcType = Context.getArrayDecayedType(SrcType);
-
-    Qualifiers lhq = SrcType->getPointeeType().getQualifiers();
-    Qualifiers rhq = DstType->getPointeeType().getQualifiers();
-    if (lhq.getAddressSpace() != rhq.getAddressSpace()) {
-      DiagKind = diag::err_typecheck_incompatible_address_space;
-      break;
-
-    } else if (lhq.getObjCLifetime() != rhq.getObjCLifetime()) {
-      DiagKind = diag::err_typecheck_incompatible_ownership;
-      break;
-    }
-
-    llvm_unreachable("unknown error case for discarding qualifiers!");
-    // fallthrough
-  }
-  case CompatiblePointerDiscardsQualifiers:
-    // If the qualifiers lost were because we were applying the
-    // (deprecated) C++ conversion from a string literal to a char*
-    // (or wchar_t*), then there was no error (C++ 4.2p2).  FIXME:
-    // Ideally, this check would be performed in
-    // checkPointerTypesForAssignment. However, that would require a
-    // bit of refactoring (so that the second argument is an
-    // expression, rather than a type), which should be done as part
-    // of a larger effort to fix checkPointerTypesForAssignment for
-    // C++ semantics.
-    if (getLangOpts().CPlusPlus &&
-        IsStringLiteralToNonConstPointerConversion(SrcExpr, DstType))
-      return false;
-    DiagKind = diag::ext_typecheck_convert_discards_qualifiers;
-    break;
-  case IncompatibleNestedPointerQualifiers:
-    DiagKind = diag::ext_nested_pointer_qualifier_mismatch;
-    break;
-  case IntToBlockPointer:
-    DiagKind = diag::err_int_to_block_pointer;
-    break;
-  case IncompatibleBlockPointer:
-    DiagKind = diag::err_typecheck_convert_incompatible_block_pointer;
-    break;
-  case IncompatibleObjCQualifiedId: {
-    if (SrcType->isObjCQualifiedIdType()) {
-      const ObjCObjectPointerType *srcOPT =
-                SrcType->getAs<ObjCObjectPointerType>();
-      for (auto *srcProto : srcOPT->quals()) {
-        PDecl = srcProto;
-        break;
-      }
-      if (const ObjCInterfaceType *IFaceT =
-            DstType->getAs<ObjCObjectPointerType>()->getInterfaceType())
-        IFace = IFaceT->getDecl();
-    }
-    else if (DstType->isObjCQualifiedIdType()) {
-      const ObjCObjectPointerType *dstOPT =
-        DstType->getAs<ObjCObjectPointerType>();
-      for (auto *dstProto : dstOPT->quals()) {
-        PDecl = dstProto;
-        break;
-      }
-      if (const ObjCInterfaceType *IFaceT =
-            SrcType->getAs<ObjCObjectPointerType>()->getInterfaceType())
-        IFace = IFaceT->getDecl();
-    }
-    DiagKind = diag::warn_incompatible_qualified_id;
-    break;
-  }
-  case IncompatibleVectors:
-    DiagKind = diag::warn_incompatible_vectors;
-    break;
-  case IncompatibleObjCWeakRef:
-    DiagKind = diag::err_arc_weak_unavailable_assign;
-    break;
-  case Incompatible:
-    if (maybeDiagnoseAssignmentToFunction(*this, DstType, SrcExpr)) {
-      if (Complained)
-        *Complained = true;
-      return true;
-    }
-
-    DiagKind = diag::err_typecheck_convert_incompatible;
-    ConvHints.tryToFixConversion(SrcExpr, SrcType, DstType, *this);
-    MayHaveConvFixit = true;
-    isInvalid = true;
-    MayHaveFunctionDiff = true;
-    break;
-  }
-
-  QualType FirstType, SecondType;
-  switch (Action) {
-  case AA_Assigning:
-  case AA_Initializing:
-    // The destination type comes first.
-    FirstType = DstType;
-    SecondType = SrcType;
-    break;
-
-  case AA_Returning:
-  case AA_Passing:
-  case AA_Passing_CFAudited:
-  case AA_Converting:
-  case AA_Sending:
-  case AA_Casting:
-    // The source type comes first.
-    FirstType = SrcType;
-    SecondType = DstType;
-    break;
-  }
-
-  PartialDiagnostic FDiag = PDiag(DiagKind);
-  if (Action == AA_Passing_CFAudited)
-    FDiag << FirstType << SecondType << AA_Passing << SrcExpr->getSourceRange();
-  else
-    FDiag << FirstType << SecondType << Action << SrcExpr->getSourceRange();
-
-  // If we can fix the conversion, suggest the FixIts.
-  assert(ConvHints.isNull() || Hint.isNull());
-  if (!ConvHints.isNull()) {
-    for (FixItHint &H : ConvHints.Hints)
-      FDiag << H;
-  } else {
-    FDiag << Hint;
-  }
-  if (MayHaveConvFixit) { FDiag << (unsigned) (ConvHints.Kind); }
-
-  if (MayHaveFunctionDiff)
-    HandleFunctionTypeMismatch(FDiag, SecondType, FirstType);
-
-  Diag(Loc, FDiag);
-  if (DiagKind == diag::warn_incompatible_qualified_id &&
-      PDecl && IFace && !IFace->hasDefinition())
-      Diag(IFace->getLocation(), diag::note_incomplete_class_and_qualified_id)
-        << IFace << PDecl;
-
-  if (SecondType == Context.OverloadTy)
-    NoteAllOverloadCandidates(OverloadExpr::find(SrcExpr).Expression,
-                              FirstType, /*TakingAddress=*/true);
-
-  if (CheckInferredResultType)
-    EmitRelatedResultTypeNote(SrcExpr);
-
-  if (Action == AA_Returning && ConvTy == IncompatiblePointer)
-    EmitRelatedResultTypeNoteForReturn(DstType);
-
-  if (Complained)
-    *Complained = true;
-  return isInvalid;
-}
-
-ExprResult Sema::VerifyIntegerConstantExpression(Expr *E,
-                                                 llvm::APSInt *Result) {
-  class SimpleICEDiagnoser : public VerifyICEDiagnoser {
-  public:
-    void diagnoseNotICE(Sema &S, SourceLocation Loc, SourceRange SR) override {
-      S.Diag(Loc, diag::err_expr_not_ice) << S.LangOpts.CPlusPlus << SR;
-    }
-  } Diagnoser;
-
-  return VerifyIntegerConstantExpression(E, Result, Diagnoser);
-}
-
-ExprResult Sema::VerifyIntegerConstantExpression(Expr *E,
-                                                 llvm::APSInt *Result,
-                                                 unsigned DiagID,
-                                                 bool AllowFold) {
-  class IDDiagnoser : public VerifyICEDiagnoser {
-    unsigned DiagID;
-
-  public:
-    IDDiagnoser(unsigned DiagID)
-      : VerifyICEDiagnoser(DiagID == 0), DiagID(DiagID) { }
-
-    void diagnoseNotICE(Sema &S, SourceLocation Loc, SourceRange SR) override {
-      S.Diag(Loc, DiagID) << SR;
-    }
-  } Diagnoser(DiagID);
-
-  return VerifyIntegerConstantExpression(E, Result, Diagnoser, AllowFold);
-}
-
-void Sema::VerifyICEDiagnoser::diagnoseFold(Sema &S, SourceLocation Loc,
-                                            SourceRange SR) {
-  S.Diag(Loc, diag::ext_expr_not_ice) << SR << S.LangOpts.CPlusPlus;
-}
-
-ExprResult
-Sema::VerifyIntegerConstantExpression(Expr *E, llvm::APSInt *Result,
-                                      VerifyICEDiagnoser &Diagnoser,
-                                      bool AllowFold) {
-  SourceLocation DiagLoc = E->getBeginLoc();
-
-  if (getLangOpts().CPlusPlus11) {
-    // C++11 [expr.const]p5:
-    //   If an expression of literal class type is used in a context where an
-    //   integral constant expression is required, then that class type shall
-    //   have a single non-explicit conversion function to an integral or
-    //   unscoped enumeration type
-    ExprResult Converted;
-    class CXX11ConvertDiagnoser : public ICEConvertDiagnoser {
-    public:
-      CXX11ConvertDiagnoser(bool Silent)
-          : ICEConvertDiagnoser(/*AllowScopedEnumerations*/false,
-                                Silent, true) {}
-
-      SemaDiagnosticBuilder diagnoseNotInt(Sema &S, SourceLocation Loc,
-                                           QualType T) override {
-        return S.Diag(Loc, diag::err_ice_not_integral) << T;
-      }
-
-      SemaDiagnosticBuilder diagnoseIncomplete(
-          Sema &S, SourceLocation Loc, QualType T) override {
-        return S.Diag(Loc, diag::err_ice_incomplete_type) << T;
-      }
-
-      SemaDiagnosticBuilder diagnoseExplicitConv(
-          Sema &S, SourceLocation Loc, QualType T, QualType ConvTy) override {
-        return S.Diag(Loc, diag::err_ice_explicit_conversion) << T << ConvTy;
-      }
-
-      SemaDiagnosticBuilder noteExplicitConv(
-          Sema &S, CXXConversionDecl *Conv, QualType ConvTy) override {
-        return S.Diag(Conv->getLocation(), diag::note_ice_conversion_here)
-                 << ConvTy->isEnumeralType() << ConvTy;
-      }
-
-      SemaDiagnosticBuilder diagnoseAmbiguous(
-          Sema &S, SourceLocation Loc, QualType T) override {
-        return S.Diag(Loc, diag::err_ice_ambiguous_conversion) << T;
-      }
-
-      SemaDiagnosticBuilder noteAmbiguous(
-          Sema &S, CXXConversionDecl *Conv, QualType ConvTy) override {
-        return S.Diag(Conv->getLocation(), diag::note_ice_conversion_here)
-                 << ConvTy->isEnumeralType() << ConvTy;
-      }
-
-      SemaDiagnosticBuilder diagnoseConversion(
-          Sema &S, SourceLocation Loc, QualType T, QualType ConvTy) override {
-        llvm_unreachable("conversion functions are permitted");
-      }
-    } ConvertDiagnoser(Diagnoser.Suppress);
-
-    Converted = PerformContextualImplicitConversion(DiagLoc, E,
-                                                    ConvertDiagnoser);
-    if (Converted.isInvalid())
-      return Converted;
-    E = Converted.get();
-    if (!E->getType()->isIntegralOrUnscopedEnumerationType())
-      return ExprError();
-  } else if (!E->getType()->isIntegralOrUnscopedEnumerationType()) {
-    // An ICE must be of integral or unscoped enumeration type.
-    if (!Diagnoser.Suppress)
-      Diagnoser.diagnoseNotICE(*this, DiagLoc, E->getSourceRange());
-    return ExprError();
-  }
-
-  if (!isa<ConstantExpr>(E))
-    E = ConstantExpr::Create(Context, E);
-
-  // Circumvent ICE checking in C++11 to avoid evaluating the expression twice
-  // in the non-ICE case.
-  if (!getLangOpts().CPlusPlus11 && E->isIntegerConstantExpr(Context)) {
-    if (Result)
-      *Result = E->EvaluateKnownConstIntCheckOverflow(Context);
-    return E;
-  }
-
-  Expr::EvalResult EvalResult;
-  SmallVector<PartialDiagnosticAt, 8> Notes;
-  EvalResult.Diag = &Notes;
-
-  // Try to evaluate the expression, and produce diagnostics explaining why it's
-  // not a constant expression as a side-effect.
-  bool Folded = E->EvaluateAsRValue(EvalResult, Context) &&
-                EvalResult.Val.isInt() && !EvalResult.HasSideEffects;
-
-  // In C++11, we can rely on diagnostics being produced for any expression
-  // which is not a constant expression. If no diagnostics were produced, then
-  // this is a constant expression.
-  if (Folded && getLangOpts().CPlusPlus11 && Notes.empty()) {
-    if (Result)
-      *Result = EvalResult.Val.getInt();
-    return E;
-  }
-
-  // If our only note is the usual "invalid subexpression" note, just point
-  // the caret at its location rather than producing an essentially
-  // redundant note.
-  if (Notes.size() == 1 && Notes[0].second.getDiagID() ==
-        diag::note_invalid_subexpr_in_const_expr) {
-    DiagLoc = Notes[0].first;
-    Notes.clear();
-  }
-
-  if (!Folded || !AllowFold) {
-    if (!Diagnoser.Suppress) {
-      Diagnoser.diagnoseNotICE(*this, DiagLoc, E->getSourceRange());
-      for (const PartialDiagnosticAt &Note : Notes)
-        Diag(Note.first, Note.second);
-    }
-
-    return ExprError();
-  }
-
-  Diagnoser.diagnoseFold(*this, DiagLoc, E->getSourceRange());
-  for (const PartialDiagnosticAt &Note : Notes)
-    Diag(Note.first, Note.second);
-
-  if (Result)
-    *Result = EvalResult.Val.getInt();
-  return E;
-}
-
-namespace {
-  // Handle the case where we conclude a expression which we speculatively
-  // considered to be unevaluated is actually evaluated.
-  class TransformToPE : public TreeTransform<TransformToPE> {
-    typedef TreeTransform<TransformToPE> BaseTransform;
-
-  public:
-    TransformToPE(Sema &SemaRef) : BaseTransform(SemaRef) { }
-
-    // Make sure we redo semantic analysis
-    bool AlwaysRebuild() { return true; }
-
-    // Make sure we handle LabelStmts correctly.
-    // FIXME: This does the right thing, but maybe we need a more general
-    // fix to TreeTransform?
-    StmtResult TransformLabelStmt(LabelStmt *S) {
-      S->getDecl()->setStmt(nullptr);
-      return BaseTransform::TransformLabelStmt(S);
-    }
-
-    // We need to special-case DeclRefExprs referring to FieldDecls which
-    // are not part of a member pointer formation; normal TreeTransforming
-    // doesn't catch this case because of the way we represent them in the AST.
-    // FIXME: This is a bit ugly; is it really the best way to handle this
-    // case?
-    //
-    // Error on DeclRefExprs referring to FieldDecls.
-    ExprResult TransformDeclRefExpr(DeclRefExpr *E) {
-      if (isa<FieldDecl>(E->getDecl()) &&
-          !SemaRef.isUnevaluatedContext())
-        return SemaRef.Diag(E->getLocation(),
-                            diag::err_invalid_non_static_member_use)
-            << E->getDecl() << E->getSourceRange();
-
-      return BaseTransform::TransformDeclRefExpr(E);
-    }
-
-    // Exception: filter out member pointer formation
-    ExprResult TransformUnaryOperator(UnaryOperator *E) {
-      if (E->getOpcode() == UO_AddrOf && E->getType()->isMemberPointerType())
-        return E;
-
-      return BaseTransform::TransformUnaryOperator(E);
-    }
-
-    ExprResult TransformLambdaExpr(LambdaExpr *E) {
-      // Lambdas never need to be transformed.
-      return E;
-    }
-  };
-}
-
-ExprResult Sema::TransformToPotentiallyEvaluated(Expr *E) {
-  assert(isUnevaluatedContext() &&
-         "Should only transform unevaluated expressions");
-  ExprEvalContexts.back().Context =
-      ExprEvalContexts[ExprEvalContexts.size()-2].Context;
-  if (isUnevaluatedContext())
-    return E;
-  return TransformToPE(*this).TransformExpr(E);
-}
-
-void
-Sema::PushExpressionEvaluationContext(
-    ExpressionEvaluationContext NewContext, Decl *LambdaContextDecl,
-    ExpressionEvaluationContextRecord::ExpressionKind ExprContext) {
-  ExprEvalContexts.emplace_back(NewContext, ExprCleanupObjects.size(), Cleanup,
-                                LambdaContextDecl, ExprContext);
-  Cleanup.reset();
-  if (!MaybeODRUseExprs.empty())
-    std::swap(MaybeODRUseExprs, ExprEvalContexts.back().SavedMaybeODRUseExprs);
-}
-
-void
-Sema::PushExpressionEvaluationContext(
-    ExpressionEvaluationContext NewContext, ReuseLambdaContextDecl_t,
-    ExpressionEvaluationContextRecord::ExpressionKind ExprContext) {
-  Decl *ClosureContextDecl = ExprEvalContexts.back().ManglingContextDecl;
-  PushExpressionEvaluationContext(NewContext, ClosureContextDecl, ExprContext);
-}
-
-namespace {
-
-const DeclRefExpr *CheckPossibleDeref(Sema &S, const Expr *PossibleDeref) {
-  PossibleDeref = PossibleDeref->IgnoreParenImpCasts();
-  if (const auto *E = dyn_cast<UnaryOperator>(PossibleDeref)) {
-    if (E->getOpcode() == UO_Deref)
-      return CheckPossibleDeref(S, E->getSubExpr());
-  } else if (const auto *E = dyn_cast<ArraySubscriptExpr>(PossibleDeref)) {
-    return CheckPossibleDeref(S, E->getBase());
-  } else if (const auto *E = dyn_cast<MemberExpr>(PossibleDeref)) {
-    return CheckPossibleDeref(S, E->getBase());
-  } else if (const auto E = dyn_cast<DeclRefExpr>(PossibleDeref)) {
-    QualType Inner;
-    QualType Ty = E->getType();
-    if (const auto *Ptr = Ty->getAs<PointerType>())
-      Inner = Ptr->getPointeeType();
-    else if (const auto *Arr = S.Context.getAsArrayType(Ty))
-      Inner = Arr->getElementType();
-    else
-      return nullptr;
-
-    if (Inner->hasAttr(attr::NoDeref))
-      return E;
-  }
-  return nullptr;
-}
-
-} // namespace
-
-void Sema::WarnOnPendingNoDerefs(ExpressionEvaluationContextRecord &Rec) {
-  for (const Expr *E : Rec.PossibleDerefs) {
-    const DeclRefExpr *DeclRef = CheckPossibleDeref(*this, E);
-    if (DeclRef) {
-      const ValueDecl *Decl = DeclRef->getDecl();
-      Diag(E->getExprLoc(), diag::warn_dereference_of_noderef_type)
-          << Decl->getName() << E->getSourceRange();
-      Diag(Decl->getLocation(), diag::note_previous_decl) << Decl->getName();
-    } else {
-      Diag(E->getExprLoc(), diag::warn_dereference_of_noderef_type_no_decl)
-          << E->getSourceRange();
-    }
-  }
-  Rec.PossibleDerefs.clear();
-}
-
-void Sema::PopExpressionEvaluationContext() {
-  ExpressionEvaluationContextRecord& Rec = ExprEvalContexts.back();
-  unsigned NumTypos = Rec.NumTypos;
-
-  if (!Rec.Lambdas.empty()) {
-    using ExpressionKind = ExpressionEvaluationContextRecord::ExpressionKind;
-    if (Rec.ExprContext == ExpressionKind::EK_TemplateArgument || Rec.isUnevaluated() ||
-        (Rec.isConstantEvaluated() && !getLangOpts().CPlusPlus17)) {
-      unsigned D;
-      if (Rec.isUnevaluated()) {
-        // C++11 [expr.prim.lambda]p2:
-        //   A lambda-expression shall not appear in an unevaluated operand
-        //   (Clause 5).
-        D = diag::err_lambda_unevaluated_operand;
-      } else if (Rec.isConstantEvaluated() && !getLangOpts().CPlusPlus17) {
-        // C++1y [expr.const]p2:
-        //   A conditional-expression e is a core constant expression unless the
-        //   evaluation of e, following the rules of the abstract machine, would
-        //   evaluate [...] a lambda-expression.
-        D = diag::err_lambda_in_constant_expression;
-      } else if (Rec.ExprContext == ExpressionKind::EK_TemplateArgument) {
-        // C++17 [expr.prim.lamda]p2:
-        // A lambda-expression shall not appear [...] in a template-argument.
-        D = diag::err_lambda_in_invalid_context;
-      } else
-        llvm_unreachable("Couldn't infer lambda error message.");
-
-      for (const auto *L : Rec.Lambdas)
-        Diag(L->getBeginLoc(), D);
-    } else {
-      // Mark the capture expressions odr-used. This was deferred
-      // during lambda expression creation.
-      for (auto *Lambda : Rec.Lambdas) {
-        for (auto *C : Lambda->capture_inits())
-          MarkDeclarationsReferencedInExpr(C);
-      }
-    }
-  }
-
-  WarnOnPendingNoDerefs(Rec);
-
-  // When are coming out of an unevaluated context, clear out any
-  // temporaries that we may have created as part of the evaluation of
-  // the expression in that context: they aren't relevant because they
-  // will never be constructed.
-  if (Rec.isUnevaluated() || Rec.isConstantEvaluated()) {
-    ExprCleanupObjects.erase(ExprCleanupObjects.begin() + Rec.NumCleanupObjects,
-                             ExprCleanupObjects.end());
-    Cleanup = Rec.ParentCleanup;
-    CleanupVarDeclMarking();
-    std::swap(MaybeODRUseExprs, Rec.SavedMaybeODRUseExprs);
-  // Otherwise, merge the contexts together.
-  } else {
-    Cleanup.mergeFrom(Rec.ParentCleanup);
-    MaybeODRUseExprs.insert(Rec.SavedMaybeODRUseExprs.begin(),
-                            Rec.SavedMaybeODRUseExprs.end());
-  }
-
-  // Pop the current expression evaluation context off the stack.
-  ExprEvalContexts.pop_back();
-
-  // The global expression evaluation context record is never popped.
-  ExprEvalContexts.back().NumTypos += NumTypos;
-}
-
-void Sema::DiscardCleanupsInEvaluationContext() {
-  ExprCleanupObjects.erase(
-         ExprCleanupObjects.begin() + ExprEvalContexts.back().NumCleanupObjects,
-         ExprCleanupObjects.end());
-  Cleanup.reset();
-  MaybeODRUseExprs.clear();
-}
-
-ExprResult Sema::HandleExprEvaluationContextForTypeof(Expr *E) {
-  ExprResult Result = CheckPlaceholderExpr(E);
-  if (Result.isInvalid())
-    return ExprError();
-  E = Result.get();
-  if (!E->getType()->isVariablyModifiedType())
-    return E;
-  return TransformToPotentiallyEvaluated(E);
-}
-
-/// Are we within a context in which some evaluation could be performed (be it
-/// constant evaluation or runtime evaluation)? Sadly, this notion is not quite
-/// captured by C++'s idea of an "unevaluated context".
-static bool isEvaluatableContext(Sema &SemaRef) {
-  switch (SemaRef.ExprEvalContexts.back().Context) {
-    case Sema::ExpressionEvaluationContext::Unevaluated:
-    case Sema::ExpressionEvaluationContext::UnevaluatedAbstract:
-      // Expressions in this context are never evaluated.
-      return false;
-
-    case Sema::ExpressionEvaluationContext::UnevaluatedList:
-    case Sema::ExpressionEvaluationContext::ConstantEvaluated:
-    case Sema::ExpressionEvaluationContext::PotentiallyEvaluated:
-    case Sema::ExpressionEvaluationContext::DiscardedStatement:
-      // Expressions in this context could be evaluated.
-      return true;
-
-    case Sema::ExpressionEvaluationContext::PotentiallyEvaluatedIfUsed:
-      // Referenced declarations will only be used if the construct in the
-      // containing expression is used, at which point we'll be given another
-      // turn to mark them.
-      return false;
-  }
-  llvm_unreachable("Invalid context");
-}
-
-/// Are we within a context in which references to resolved functions or to
-/// variables result in odr-use?
-static bool isOdrUseContext(Sema &SemaRef, bool SkipDependentUses = true) {
-  // An expression in a template is not really an expression until it's been
-  // instantiated, so it doesn't trigger odr-use.
-  if (SkipDependentUses && SemaRef.CurContext->isDependentContext())
-    return false;
-
-  switch (SemaRef.ExprEvalContexts.back().Context) {
-    case Sema::ExpressionEvaluationContext::Unevaluated:
-    case Sema::ExpressionEvaluationContext::UnevaluatedList:
-    case Sema::ExpressionEvaluationContext::UnevaluatedAbstract:
-    case Sema::ExpressionEvaluationContext::DiscardedStatement:
-      return false;
-
-    case Sema::ExpressionEvaluationContext::ConstantEvaluated:
-    case Sema::ExpressionEvaluationContext::PotentiallyEvaluated:
-      return true;
-
-    case Sema::ExpressionEvaluationContext::PotentiallyEvaluatedIfUsed:
-      return false;
-  }
-  llvm_unreachable("Invalid context");
-}
-
-static bool isImplicitlyDefinableConstexprFunction(FunctionDecl *Func) {
-  CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Func);
-  return Func->isConstexpr() &&
-         (Func->isImplicitlyInstantiable() || (MD && !MD->isUserProvided()));
-}
-
-/// Mark a function referenced, and check whether it is odr-used
-/// (C++ [basic.def.odr]p2, C99 6.9p3)
-void Sema::MarkFunctionReferenced(SourceLocation Loc, FunctionDecl *Func,
-                                  bool MightBeOdrUse) {
-  assert(Func && "No function?");
-
-  Func->setReferenced();
-
-  // C++11 [basic.def.odr]p3:
-  //   A function whose name appears as a potentially-evaluated expression is
-  //   odr-used if it is the unique lookup result or the selected member of a
-  //   set of overloaded functions [...].
-  //
-  // We (incorrectly) mark overload resolution as an unevaluated context, so we
-  // can just check that here.
-  bool OdrUse = MightBeOdrUse && isOdrUseContext(*this);
-
-  // Determine whether we require a function definition to exist, per
-  // C++11 [temp.inst]p3:
-  //   Unless a function template specialization has been explicitly
-  //   instantiated or explicitly specialized, the function template
-  //   specialization is implicitly instantiated when the specialization is
-  //   referenced in a context that requires a function definition to exist.
-  //
-  // That is either when this is an odr-use, or when a usage of a constexpr
-  // function occurs within an evaluatable context.
-  bool NeedDefinition =
-      OdrUse || (isEvaluatableContext(*this) &&
-                 isImplicitlyDefinableConstexprFunction(Func));
-
-  // C++14 [temp.expl.spec]p6:
-  //   If a template [...] is explicitly specialized then that specialization
-  //   shall be declared before the first use of that specialization that would
-  //   cause an implicit instantiation to take place, in every translation unit
-  //   in which such a use occurs
-  if (NeedDefinition &&
-      (Func->getTemplateSpecializationKind() != TSK_Undeclared ||
-       Func->getMemberSpecializationInfo()))
-    checkSpecializationVisibility(Loc, Func);
-
-  // C++14 [except.spec]p17:
-  //   An exception-specification is considered to be needed when:
-  //   - the function is odr-used or, if it appears in an unevaluated operand,
-  //     would be odr-used if the expression were potentially-evaluated;
-  //
-  // Note, we do this even if MightBeOdrUse is false. That indicates that the
-  // function is a pure virtual function we're calling, and in that case the
-  // function was selected by overload resolution and we need to resolve its
-  // exception specification for a different reason.
-  const FunctionProtoType *FPT = Func->getType()->getAs<FunctionProtoType>();
-  if (FPT && isUnresolvedExceptionSpec(FPT->getExceptionSpecType()))
-    ResolveExceptionSpec(Loc, FPT);
-
-  // If we don't need to mark the function as used, and we don't need to
-  // try to provide a definition, there's nothing more to do.
-  if ((Func->isUsed(/*CheckUsedAttr=*/false) || !OdrUse) &&
-      (!NeedDefinition || Func->getBody()))
-    return;
-
-  // Note that this declaration has been used.
-  if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Func)) {
-    Constructor = cast<CXXConstructorDecl>(Constructor->getFirstDecl());
-    if (Constructor->isDefaulted() && !Constructor->isDeleted()) {
-      if (Constructor->isDefaultConstructor()) {
-        if (Constructor->isTrivial() && !Constructor->hasAttr<DLLExportAttr>())
-          return;
-        DefineImplicitDefaultConstructor(Loc, Constructor);
-      } else if (Constructor->isCopyConstructor()) {
-        DefineImplicitCopyConstructor(Loc, Constructor);
-      } else if (Constructor->isMoveConstructor()) {
-        DefineImplicitMoveConstructor(Loc, Constructor);
-      }
-    } else if (Constructor->getInheritedConstructor()) {
-      DefineInheritingConstructor(Loc, Constructor);
-    }
-  } else if (CXXDestructorDecl *Destructor =
-                 dyn_cast<CXXDestructorDecl>(Func)) {
-    Destructor = cast<CXXDestructorDecl>(Destructor->getFirstDecl());
-    if (Destructor->isDefaulted() && !Destructor->isDeleted()) {
-      if (Destructor->isTrivial() && !Destructor->hasAttr<DLLExportAttr>())
-        return;
-      DefineImplicitDestructor(Loc, Destructor);
-    }
-    if (Destructor->isVirtual() && getLangOpts().AppleKext)
-      MarkVTableUsed(Loc, Destructor->getParent());
-  } else if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(Func)) {
-    if (MethodDecl->isOverloadedOperator() &&
-        MethodDecl->getOverloadedOperator() == OO_Equal) {
-      MethodDecl = cast<CXXMethodDecl>(MethodDecl->getFirstDecl());
-      if (MethodDecl->isDefaulted() && !MethodDecl->isDeleted()) {
-        if (MethodDecl->isCopyAssignmentOperator())
-          DefineImplicitCopyAssignment(Loc, MethodDecl);
-        else if (MethodDecl->isMoveAssignmentOperator())
-          DefineImplicitMoveAssignment(Loc, MethodDecl);
-      }
-    } else if (isa<CXXConversionDecl>(MethodDecl) &&
-               MethodDecl->getParent()->isLambda()) {
-      CXXConversionDecl *Conversion =
-          cast<CXXConversionDecl>(MethodDecl->getFirstDecl());
-      if (Conversion->isLambdaToBlockPointerConversion())
-        DefineImplicitLambdaToBlockPointerConversion(Loc, Conversion);
-      else
-        DefineImplicitLambdaToFunctionPointerConversion(Loc, Conversion);
-    } else if (MethodDecl->isVirtual() && getLangOpts().AppleKext)
-      MarkVTableUsed(Loc, MethodDecl->getParent());
-  }
-
-  // Recursive functions should be marked when used from another function.
-  // FIXME: Is this really right?
-  if (CurContext == Func) return;
-
-  // Implicit instantiation of function templates and member functions of
-  // class templates.
-  if (Func->isImplicitlyInstantiable()) {
-    TemplateSpecializationKind TSK = Func->getTemplateSpecializationKind();
-    SourceLocation PointOfInstantiation = Func->getPointOfInstantiation();
-    bool FirstInstantiation = PointOfInstantiation.isInvalid();
-    if (FirstInstantiation) {
-      PointOfInstantiation = Loc;
-      Func->setTemplateSpecializationKind(TSK, PointOfInstantiation);
-    } else if (TSK != TSK_ImplicitInstantiation) {
-      // Use the point of use as the point of instantiation, instead of the
-      // point of explicit instantiation (which we track as the actual point of
-      // instantiation). This gives better backtraces in diagnostics.
-      PointOfInstantiation = Loc;
-    }
-
-    if (FirstInstantiation || TSK != TSK_ImplicitInstantiation ||
-        Func->isConstexpr()) {
-      if (isa<CXXRecordDecl>(Func->getDeclContext()) &&
-          cast<CXXRecordDecl>(Func->getDeclContext())->isLocalClass() &&
-          CodeSynthesisContexts.size())
-        PendingLocalImplicitInstantiations.push_back(
-            std::make_pair(Func, PointOfInstantiation));
-      else if (Func->isConstexpr())
-        // Do not defer instantiations of constexpr functions, to avoid the
-        // expression evaluator needing to call back into Sema if it sees a
-        // call to such a function.
-        InstantiateFunctionDefinition(PointOfInstantiation, Func);
-      else {
-        Func->setInstantiationIsPending(true);
-        PendingInstantiations.push_back(std::make_pair(Func,
-                                                       PointOfInstantiation));
-        // Notify the consumer that a function was implicitly instantiated.
-        Consumer.HandleCXXImplicitFunctionInstantiation(Func);
-      }
-    }
-  } else {
-    // Walk redefinitions, as some of them may be instantiable.
-    for (auto i : Func->redecls()) {
-      if (!i->isUsed(false) && i->isImplicitlyInstantiable())
-        MarkFunctionReferenced(Loc, i, OdrUse);
-    }
-  }
-
-  if (!OdrUse) return;
-
-  // Keep track of used but undefined functions.
-  if (!Func->isDefined()) {
-    if (mightHaveNonExternalLinkage(Func))
-      UndefinedButUsed.insert(std::make_pair(Func->getCanonicalDecl(), Loc));
-    else if (Func->getMostRecentDecl()->isInlined() &&
-             !LangOpts.GNUInline &&
-             !Func->getMostRecentDecl()->hasAttr<GNUInlineAttr>())
-      UndefinedButUsed.insert(std::make_pair(Func->getCanonicalDecl(), Loc));
-    else if (isExternalWithNoLinkageType(Func))
-      UndefinedButUsed.insert(std::make_pair(Func->getCanonicalDecl(), Loc));
-  }
-
-  Func->markUsed(Context);
-}
-
-static void
-diagnoseUncapturableValueReference(Sema &S, SourceLocation loc,
-                                   ValueDecl *var, DeclContext *DC) {
-  DeclContext *VarDC = var->getDeclContext();
-
-  //  If the parameter still belongs to the translation unit, then
-  //  we're actually just using one parameter in the declaration of
-  //  the next.
-  if (isa<ParmVarDecl>(var) &&
-      isa<TranslationUnitDecl>(VarDC))
-    return;
-
-  // For C code, don't diagnose about capture if we're not actually in code
-  // right now; it's impossible to write a non-constant expression outside of
-  // function context, so we'll get other (more useful) diagnostics later.
-  //
-  // For C++, things get a bit more nasty... it would be nice to suppress this
-  // diagnostic for certain cases like using a local variable in an array bound
-  // for a member of a local class, but the correct predicate is not obvious.
-  if (!S.getLangOpts().CPlusPlus && !S.CurContext->isFunctionOrMethod())
-    return;
-
-  unsigned ValueKind = isa<BindingDecl>(var) ? 1 : 0;
-  unsigned ContextKind = 3; // unknown
-  if (isa<CXXMethodDecl>(VarDC) &&
-      cast<CXXRecordDecl>(VarDC->getParent())->isLambda()) {
-    ContextKind = 2;
-  } else if (isa<FunctionDecl>(VarDC)) {
-    ContextKind = 0;
-  } else if (isa<BlockDecl>(VarDC)) {
-    ContextKind = 1;
-  }
-
-  S.Diag(loc, diag::err_reference_to_local_in_enclosing_context)
-    << var << ValueKind << ContextKind << VarDC;
-  S.Diag(var->getLocation(), diag::note_entity_declared_at)
-      << var;
-
-  // FIXME: Add additional diagnostic info about class etc. which prevents
-  // capture.
-}
-
-
-static bool isVariableAlreadyCapturedInScopeInfo(CapturingScopeInfo *CSI, VarDecl *Var,
-                                      bool &SubCapturesAreNested,
-                                      QualType &CaptureType,
-                                      QualType &DeclRefType) {
-   // Check whether we've already captured it.
-  if (CSI->CaptureMap.count(Var)) {
-    // If we found a capture, any subcaptures are nested.
-    SubCapturesAreNested = true;
-
-    // Retrieve the capture type for this variable.
-    CaptureType = CSI->getCapture(Var).getCaptureType();
-
-    // Compute the type of an expression that refers to this variable.
-    DeclRefType = CaptureType.getNonReferenceType();
-
-    // Similarly to mutable captures in lambda, all the OpenMP captures by copy
-    // are mutable in the sense that user can change their value - they are
-    // private instances of the captured declarations.
-    const Capture &Cap = CSI->getCapture(Var);
-    if (Cap.isCopyCapture() &&
-        !(isa<LambdaScopeInfo>(CSI) && cast<LambdaScopeInfo>(CSI)->Mutable) &&
-        !(isa<CapturedRegionScopeInfo>(CSI) &&
-          cast<CapturedRegionScopeInfo>(CSI)->CapRegionKind == CR_OpenMP))
-      DeclRefType.addConst();
-    return true;
-  }
-  return false;
-}
-
-// Only block literals, captured statements, and lambda expressions can
-// capture; other scopes don't work.
-static DeclContext *getParentOfCapturingContextOrNull(DeclContext *DC, VarDecl *Var,
-                                 SourceLocation Loc,
-                                 const bool Diagnose, Sema &S) {
-  if (isa<BlockDecl>(DC) || isa<CapturedDecl>(DC) || isLambdaCallOperator(DC))
-    return getLambdaAwareParentOfDeclContext(DC);
-  else if (Var->hasLocalStorage()) {
-    if (Diagnose)
-       diagnoseUncapturableValueReference(S, Loc, Var, DC);
-  }
-  return nullptr;
-}
-
-// Certain capturing entities (lambdas, blocks etc.) are not allowed to capture
-// certain types of variables (unnamed, variably modified types etc.)
-// so check for eligibility.
-static bool isVariableCapturable(CapturingScopeInfo *CSI, VarDecl *Var,
-                                 SourceLocation Loc,
-                                 const bool Diagnose, Sema &S) {
-
-  bool IsBlock = isa<BlockScopeInfo>(CSI);
-  bool IsLambda = isa<LambdaScopeInfo>(CSI);
-
-  // Lambdas are not allowed to capture unnamed variables
-  // (e.g. anonymous unions).
-  // FIXME: The C++11 rule don't actually state this explicitly, but I'm
-  // assuming that's the intent.
-  if (IsLambda && !Var->getDeclName()) {
-    if (Diagnose) {
-      S.Diag(Loc, diag::err_lambda_capture_anonymous_var);
-      S.Diag(Var->getLocation(), diag::note_declared_at);
-    }
-    return false;
-  }
-
-  // Prohibit variably-modified types in blocks; they're difficult to deal with.
-  if (Var->getType()->isVariablyModifiedType() && IsBlock) {
-    if (Diagnose) {
-      S.Diag(Loc, diag::err_ref_vm_type);
-      S.Diag(Var->getLocation(), diag::note_previous_decl)
-        << Var->getDeclName();
-    }
-    return false;
-  }
-  // Prohibit structs with flexible array members too.
-  // We cannot capture what is in the tail end of the struct.
-  if (const RecordType *VTTy = Var->getType()->getAs<RecordType>()) {
-    if (VTTy->getDecl()->hasFlexibleArrayMember()) {
-      if (Diagnose) {
-        if (IsBlock)
-          S.Diag(Loc, diag::err_ref_flexarray_type);
-        else
-          S.Diag(Loc, diag::err_lambda_capture_flexarray_type)
-            << Var->getDeclName();
-        S.Diag(Var->getLocation(), diag::note_previous_decl)
-          << Var->getDeclName();
-      }
-      return false;
-    }
-  }
-  const bool HasBlocksAttr = Var->hasAttr<BlocksAttr>();
-  // Lambdas and captured statements are not allowed to capture __block
-  // variables; they don't support the expected semantics.
-  if (HasBlocksAttr && (IsLambda || isa<CapturedRegionScopeInfo>(CSI))) {
-    if (Diagnose) {
-      S.Diag(Loc, diag::err_capture_block_variable)
-        << Var->getDeclName() << !IsLambda;
-      S.Diag(Var->getLocation(), diag::note_previous_decl)
-        << Var->getDeclName();
-    }
-    return false;
-  }
-  // OpenCL v2.0 s6.12.5: Blocks cannot reference/capture other blocks
-  if (S.getLangOpts().OpenCL && IsBlock &&
-      Var->getType()->isBlockPointerType()) {
-    if (Diagnose)
-      S.Diag(Loc, diag::err_opencl_block_ref_block);
-    return false;
-  }
-
-  return true;
-}
-
-// Returns true if the capture by block was successful.
-static bool captureInBlock(BlockScopeInfo *BSI, VarDecl *Var,
-                                 SourceLocation Loc,
-                                 const bool BuildAndDiagnose,
-                                 QualType &CaptureType,
-                                 QualType &DeclRefType,
-                                 const bool Nested,
-                                 Sema &S) {
-  Expr *CopyExpr = nullptr;
-  bool ByRef = false;
-
-  // Blocks are not allowed to capture arrays, excepting OpenCL.
-  // OpenCL v2.0 s1.12.5 (revision 40): arrays are captured by reference
-  // (decayed to pointers).
-  if (!S.getLangOpts().OpenCL && CaptureType->isArrayType()) {
-    if (BuildAndDiagnose) {
-      S.Diag(Loc, diag::err_ref_array_type);
-      S.Diag(Var->getLocation(), diag::note_previous_decl)
-      << Var->getDeclName();
-    }
-    return false;
-  }
-
-  // Forbid the block-capture of autoreleasing variables.
-  if (CaptureType.getObjCLifetime() == Qualifiers::OCL_Autoreleasing) {
-    if (BuildAndDiagnose) {
-      S.Diag(Loc, diag::err_arc_autoreleasing_capture)
-        << /*block*/ 0;
-      S.Diag(Var->getLocation(), diag::note_previous_decl)
-        << Var->getDeclName();
-    }
-    return false;
-  }
-
-  // Warn about implicitly autoreleasing indirect parameters captured by blocks.
-  if (const auto *PT = CaptureType->getAs<PointerType>()) {
-    // This function finds out whether there is an AttributedType of kind
-    // attr::ObjCOwnership in Ty. The existence of AttributedType of kind
-    // attr::ObjCOwnership implies __autoreleasing was explicitly specified
-    // rather than being added implicitly by the compiler.
-    auto IsObjCOwnershipAttributedType = [](QualType Ty) {
-      while (const auto *AttrTy = Ty->getAs<AttributedType>()) {
-        if (AttrTy->getAttrKind() == attr::ObjCOwnership)
-          return true;
-
-        // Peel off AttributedTypes that are not of kind ObjCOwnership.
-        Ty = AttrTy->getModifiedType();
-      }
-
-      return false;
-    };
-
-    QualType PointeeTy = PT->getPointeeType();
-
-    if (PointeeTy->getAs<ObjCObjectPointerType>() &&
-        PointeeTy.getObjCLifetime() == Qualifiers::OCL_Autoreleasing &&
-        !IsObjCOwnershipAttributedType(PointeeTy)) {
-      if (BuildAndDiagnose) {
-        SourceLocation VarLoc = Var->getLocation();
-        S.Diag(Loc, diag::warn_block_capture_autoreleasing);
-        S.Diag(VarLoc, diag::note_declare_parameter_strong);
-      }
-    }
-  }
-
-  const bool HasBlocksAttr = Var->hasAttr<BlocksAttr>();
-  if (HasBlocksAttr || CaptureType->isReferenceType() ||
-      (S.getLangOpts().OpenMP && S.isOpenMPCapturedDecl(Var))) {
-    // Block capture by reference does not change the capture or
-    // declaration reference types.
-    ByRef = true;
-  } else {
-    // Block capture by copy introduces 'const'.
-    CaptureType = CaptureType.getNonReferenceType().withConst();
-    DeclRefType = CaptureType;
-
-    if (S.getLangOpts().CPlusPlus && BuildAndDiagnose) {
-      if (const RecordType *Record = DeclRefType->getAs<RecordType>()) {
-        // The capture logic needs the destructor, so make sure we mark it.
-        // Usually this is unnecessary because most local variables have
-        // their destructors marked at declaration time, but parameters are
-        // an exception because it's technically only the call site that
-        // actually requires the destructor.
-        if (isa<ParmVarDecl>(Var))
-          S.FinalizeVarWithDestructor(Var, Record);
-
-        // Enter a new evaluation context to insulate the copy
-        // full-expression.
-        EnterExpressionEvaluationContext scope(
-            S, Sema::ExpressionEvaluationContext::PotentiallyEvaluated);
-
-        // According to the blocks spec, the capture of a variable from
-        // the stack requires a const copy constructor.  This is not true
-        // of the copy/move done to move a __block variable to the heap.
-        Expr *DeclRef = new (S.Context) DeclRefExpr(
-            S.Context, Var, Nested, DeclRefType.withConst(), VK_LValue, Loc);
-
-        ExprResult Result
-          = S.PerformCopyInitialization(
-              InitializedEntity::InitializeBlock(Var->getLocation(),
-                                                  CaptureType, false),
-              Loc, DeclRef);
-
-        // Build a full-expression copy expression if initialization
-        // succeeded and used a non-trivial constructor.  Recover from
-        // errors by pretending that the copy isn't necessary.
-        if (!Result.isInvalid() &&
-            !cast<CXXConstructExpr>(Result.get())->getConstructor()
-                ->isTrivial()) {
-          Result = S.MaybeCreateExprWithCleanups(Result);
-          CopyExpr = Result.get();
-        }
-      }
-    }
-  }
-
-  // Actually capture the variable.
-  if (BuildAndDiagnose)
-    BSI->addCapture(Var, HasBlocksAttr, ByRef, Nested, Loc,
-                    SourceLocation(), CaptureType, CopyExpr);
-
-  return true;
-
-}
-
-
-/// Capture the given variable in the captured region.
-static bool captureInCapturedRegion(CapturedRegionScopeInfo *RSI,
-                                    VarDecl *Var,
-                                    SourceLocation Loc,
-                                    const bool BuildAndDiagnose,
-                                    QualType &CaptureType,
-                                    QualType &DeclRefType,
-                                    const bool RefersToCapturedVariable,
-                                    Sema &S) {
-  // By default, capture variables by reference.
-  bool ByRef = true;
-  // Using an LValue reference type is consistent with Lambdas (see below).
-  if (S.getLangOpts().OpenMP && RSI->CapRegionKind == CR_OpenMP) {
-    if (S.isOpenMPCapturedDecl(Var)) {
-      bool HasConst = DeclRefType.isConstQualified();
-      DeclRefType = DeclRefType.getUnqualifiedType();
-      // Don't lose diagnostics about assignments to const.
-      if (HasConst)
-        DeclRefType.addConst();
-    }
-    ByRef = S.isOpenMPCapturedByRef(Var, RSI->OpenMPLevel);
-  }
-
-  if (ByRef)
-    CaptureType = S.Context.getLValueReferenceType(DeclRefType);
-  else
-    CaptureType = DeclRefType;
-
-  Expr *CopyExpr = nullptr;
-  if (BuildAndDiagnose) {
-    // The current implementation assumes that all variables are captured
-    // by references. Since there is no capture by copy, no expression
-    // evaluation will be needed.
-    RecordDecl *RD = RSI->TheRecordDecl;
-
-    FieldDecl *Field
-      = FieldDecl::Create(S.Context, RD, Loc, Loc, nullptr, CaptureType,
-                          S.Context.getTrivialTypeSourceInfo(CaptureType, Loc),
-                          nullptr, false, ICIS_NoInit);
-    Field->setImplicit(true);
-    Field->setAccess(AS_private);
-    RD->addDecl(Field);
-    if (S.getLangOpts().OpenMP && RSI->CapRegionKind == CR_OpenMP)
-      S.setOpenMPCaptureKind(Field, Var, RSI->OpenMPLevel);
-
-    CopyExpr = new (S.Context) DeclRefExpr(
-        S.Context, Var, RefersToCapturedVariable, DeclRefType, VK_LValue, Loc);
-    Var->setReferenced(true);
-    Var->markUsed(S.Context);
-  }
-
-  // Actually capture the variable.
-  if (BuildAndDiagnose)
-    RSI->addCapture(Var, /*isBlock*/false, ByRef, RefersToCapturedVariable, Loc,
-                    SourceLocation(), CaptureType, CopyExpr);
-
-
-  return true;
-}
-
-/// Create a field within the lambda class for the variable
-/// being captured.
-static void addAsFieldToClosureType(Sema &S, LambdaScopeInfo *LSI,
-                                    QualType FieldType, QualType DeclRefType,
-                                    SourceLocation Loc,
-                                    bool RefersToCapturedVariable) {
-  CXXRecordDecl *Lambda = LSI->Lambda;
-
-  // Build the non-static data member.
-  FieldDecl *Field
-    = FieldDecl::Create(S.Context, Lambda, Loc, Loc, nullptr, FieldType,
-                        S.Context.getTrivialTypeSourceInfo(FieldType, Loc),
-                        nullptr, false, ICIS_NoInit);
-  // If the variable being captured has an invalid type, mark the lambda class
-  // as invalid as well.
-  if (!FieldType->isDependentType()) {
-    if (S.RequireCompleteType(Loc, FieldType, diag::err_field_incomplete)) {
-      Lambda->setInvalidDecl();
-      Field->setInvalidDecl();
-    } else {
-      NamedDecl *Def;
-      FieldType->isIncompleteType(&Def);
-      if (Def && Def->isInvalidDecl()) {
-        Lambda->setInvalidDecl();
-        Field->setInvalidDecl();
-      }
-    }
-  }
-  Field->setImplicit(true);
-  Field->setAccess(AS_private);
-  Lambda->addDecl(Field);
-}
-
-/// Capture the given variable in the lambda.
-static bool captureInLambda(LambdaScopeInfo *LSI,
-                            VarDecl *Var,
-                            SourceLocation Loc,
-                            const bool BuildAndDiagnose,
-                            QualType &CaptureType,
-                            QualType &DeclRefType,
-                            const bool RefersToCapturedVariable,
-                            const Sema::TryCaptureKind Kind,
-                            SourceLocation EllipsisLoc,
-                            const bool IsTopScope,
-                            Sema &S) {
-
-  // Determine whether we are capturing by reference or by value.
-  bool ByRef = false;
-  if (IsTopScope && Kind != Sema::TryCapture_Implicit) {
-    ByRef = (Kind == Sema::TryCapture_ExplicitByRef);
-  } else {
-    ByRef = (LSI->ImpCaptureStyle == LambdaScopeInfo::ImpCap_LambdaByref);
-  }
-
-  // Compute the type of the field that will capture this variable.
-  if (ByRef) {
-    // C++11 [expr.prim.lambda]p15:
-    //   An entity is captured by reference if it is implicitly or
-    //   explicitly captured but not captured by copy. It is
-    //   unspecified whether additional unnamed non-static data
-    //   members are declared in the closure type for entities
-    //   captured by reference.
-    //
-    // FIXME: It is not clear whether we want to build an lvalue reference
-    // to the DeclRefType or to CaptureType.getNonReferenceType(). GCC appears
-    // to do the former, while EDG does the latter. Core issue 1249 will
-    // clarify, but for now we follow GCC because it's a more permissive and
-    // easily defensible position.
-    CaptureType = S.Context.getLValueReferenceType(DeclRefType);
-  } else {
-    // C++11 [expr.prim.lambda]p14:
-    //   For each entity captured by copy, an unnamed non-static
-    //   data member is declared in the closure type. The
-    //   declaration order of these members is unspecified. The type
-    //   of such a data member is the type of the corresponding
-    //   captured entity if the entity is not a reference to an
-    //   object, or the referenced type otherwise. [Note: If the
-    //   captured entity is a reference to a function, the
-    //   corresponding data member is also a reference to a
-    //   function. - end note ]
-    if (const ReferenceType *RefType = CaptureType->getAs<ReferenceType>()){
-      if (!RefType->getPointeeType()->isFunctionType())
-        CaptureType = RefType->getPointeeType();
-    }
-
-    // Forbid the lambda copy-capture of autoreleasing variables.
-    if (CaptureType.getObjCLifetime() == Qualifiers::OCL_Autoreleasing) {
-      if (BuildAndDiagnose) {
-        S.Diag(Loc, diag::err_arc_autoreleasing_capture) << /*lambda*/ 1;
-        S.Diag(Var->getLocation(), diag::note_previous_decl)
-          << Var->getDeclName();
-      }
-      return false;
-    }
-
-    // Make sure that by-copy captures are of a complete and non-abstract type.
-    if (BuildAndDiagnose) {
-      if (!CaptureType->isDependentType() &&
-          S.RequireCompleteType(Loc, CaptureType,
-                                diag::err_capture_of_incomplete_type,
-                                Var->getDeclName()))
-        return false;
-
-      if (S.RequireNonAbstractType(Loc, CaptureType,
-                                   diag::err_capture_of_abstract_type))
-        return false;
-    }
-  }
-
-  // Capture this variable in the lambda.
-  if (BuildAndDiagnose)
-    addAsFieldToClosureType(S, LSI, CaptureType, DeclRefType, Loc,
-                            RefersToCapturedVariable);
-
-  // Compute the type of a reference to this captured variable.
-  if (ByRef)
-    DeclRefType = CaptureType.getNonReferenceType();
-  else {
-    // C++ [expr.prim.lambda]p5:
-    //   The closure type for a lambda-expression has a public inline
-    //   function call operator [...]. This function call operator is
-    //   declared const (9.3.1) if and only if the lambda-expression's
-    //   parameter-declaration-clause is not followed by mutable.
-    DeclRefType = CaptureType.getNonReferenceType();
-    if (!LSI->Mutable && !CaptureType->isReferenceType())
-      DeclRefType.addConst();
-  }
-
-  // Add the capture.
-  if (BuildAndDiagnose)
-    LSI->addCapture(Var, /*IsBlock=*/false, ByRef, RefersToCapturedVariable,
-                    Loc, EllipsisLoc, CaptureType, /*CopyExpr=*/nullptr);
-
-  return true;
-}
-
-bool Sema::tryCaptureVariable(
-    VarDecl *Var, SourceLocation ExprLoc, TryCaptureKind Kind,
-    SourceLocation EllipsisLoc, bool BuildAndDiagnose, QualType &CaptureType,
-    QualType &DeclRefType, const unsigned *const FunctionScopeIndexToStopAt) {
-  // An init-capture is notionally from the context surrounding its
-  // declaration, but its parent DC is the lambda class.
-  DeclContext *VarDC = Var->getDeclContext();
-  if (Var->isInitCapture())
-    VarDC = VarDC->getParent();
-
-  DeclContext *DC = CurContext;
-  const unsigned MaxFunctionScopesIndex = FunctionScopeIndexToStopAt
-      ? *FunctionScopeIndexToStopAt : FunctionScopes.size() - 1;
-  // We need to sync up the Declaration Context with the
-  // FunctionScopeIndexToStopAt
-  if (FunctionScopeIndexToStopAt) {
-    unsigned FSIndex = FunctionScopes.size() - 1;
-    while (FSIndex != MaxFunctionScopesIndex) {
-      DC = getLambdaAwareParentOfDeclContext(DC);
-      --FSIndex;
-    }
-  }
-
-
-  // If the variable is declared in the current context, there is no need to
-  // capture it.
-  if (VarDC == DC) return true;
-
-  // Capture global variables if it is required to use private copy of this
-  // variable.
-  bool IsGlobal = !Var->hasLocalStorage();
-  if (IsGlobal && !(LangOpts.OpenMP && isOpenMPCapturedDecl(Var)))
-    return true;
-  Var = Var->getCanonicalDecl();
-
-  // Walk up the stack to determine whether we can capture the variable,
-  // performing the "simple" checks that don't depend on type. We stop when
-  // we've either hit the declared scope of the variable or find an existing
-  // capture of that variable.  We start from the innermost capturing-entity
-  // (the DC) and ensure that all intervening capturing-entities
-  // (blocks/lambdas etc.) between the innermost capturer and the variable`s
-  // declcontext can either capture the variable or have already captured
-  // the variable.
-  CaptureType = Var->getType();
-  DeclRefType = CaptureType.getNonReferenceType();
-  bool Nested = false;
-  bool Explicit = (Kind != TryCapture_Implicit);
-  unsigned FunctionScopesIndex = MaxFunctionScopesIndex;
-  do {
-    // Only block literals, captured statements, and lambda expressions can
-    // capture; other scopes don't work.
-    DeclContext *ParentDC = getParentOfCapturingContextOrNull(DC, Var,
-                                                              ExprLoc,
-                                                              BuildAndDiagnose,
-                                                              *this);
-    // We need to check for the parent *first* because, if we *have*
-    // private-captured a global variable, we need to recursively capture it in
-    // intermediate blocks, lambdas, etc.
-    if (!ParentDC) {
-      if (IsGlobal) {
-        FunctionScopesIndex = MaxFunctionScopesIndex - 1;
-        break;
-      }
-      return true;
-    }
-
-    FunctionScopeInfo  *FSI = FunctionScopes[FunctionScopesIndex];
-    CapturingScopeInfo *CSI = cast<CapturingScopeInfo>(FSI);
-
-
-    // Check whether we've already captured it.
-    if (isVariableAlreadyCapturedInScopeInfo(CSI, Var, Nested, CaptureType,
-                                             DeclRefType)) {
-      CSI->getCapture(Var).markUsed(BuildAndDiagnose);
-      break;
-    }
-    // If we are instantiating a generic lambda call operator body,
-    // we do not want to capture new variables.  What was captured
-    // during either a lambdas transformation or initial parsing
-    // should be used.
-    if (isGenericLambdaCallOperatorSpecialization(DC)) {
-      if (BuildAndDiagnose) {
-        LambdaScopeInfo *LSI = cast<LambdaScopeInfo>(CSI);
-        if (LSI->ImpCaptureStyle == CapturingScopeInfo::ImpCap_None) {
-          Diag(ExprLoc, diag::err_lambda_impcap) << Var->getDeclName();
-          Diag(Var->getLocation(), diag::note_previous_decl)
-             << Var->getDeclName();
-          Diag(LSI->Lambda->getBeginLoc(), diag::note_lambda_decl);
-        } else
-          diagnoseUncapturableValueReference(*this, ExprLoc, Var, DC);
-      }
-      return true;
-    }
-    // Certain capturing entities (lambdas, blocks etc.) are not allowed to capture
-    // certain types of variables (unnamed, variably modified types etc.)
-    // so check for eligibility.
-    if (!isVariableCapturable(CSI, Var, ExprLoc, BuildAndDiagnose, *this))
-       return true;
-
-    // Try to capture variable-length arrays types.
-    if (Var->getType()->isVariablyModifiedType()) {
-      // We're going to walk down into the type and look for VLA
-      // expressions.
-      QualType QTy = Var->getType();
-      if (ParmVarDecl *PVD = dyn_cast_or_null<ParmVarDecl>(Var))
-        QTy = PVD->getOriginalType();
-      captureVariablyModifiedType(Context, QTy, CSI);
-    }
-
-    if (getLangOpts().OpenMP) {
-      if (auto *RSI = dyn_cast<CapturedRegionScopeInfo>(CSI)) {
-        // OpenMP private variables should not be captured in outer scope, so
-        // just break here. Similarly, global variables that are captured in a
-        // target region should not be captured outside the scope of the region.
-        if (RSI->CapRegionKind == CR_OpenMP) {
-          bool IsOpenMPPrivateDecl = isOpenMPPrivateDecl(Var, RSI->OpenMPLevel);
-          auto IsTargetCap = !IsOpenMPPrivateDecl &&
-                             isOpenMPTargetCapturedDecl(Var, RSI->OpenMPLevel);
-          // When we detect target captures we are looking from inside the
-          // target region, therefore we need to propagate the capture from the
-          // enclosing region. Therefore, the capture is not initially nested.
-          if (IsTargetCap)
-            adjustOpenMPTargetScopeIndex(FunctionScopesIndex, RSI->OpenMPLevel);
-
-          if (IsTargetCap || IsOpenMPPrivateDecl) {
-            Nested = !IsTargetCap;
-            DeclRefType = DeclRefType.getUnqualifiedType();
-            CaptureType = Context.getLValueReferenceType(DeclRefType);
-            break;
-          }
-        }
-      }
-    }
-    if (CSI->ImpCaptureStyle == CapturingScopeInfo::ImpCap_None && !Explicit) {
-      // No capture-default, and this is not an explicit capture
-      // so cannot capture this variable.
-      if (BuildAndDiagnose) {
-        Diag(ExprLoc, diag::err_lambda_impcap) << Var->getDeclName();
-        Diag(Var->getLocation(), diag::note_previous_decl)
-          << Var->getDeclName();
-        if (cast<LambdaScopeInfo>(CSI)->Lambda)
-          Diag(cast<LambdaScopeInfo>(CSI)->Lambda->getBeginLoc(),
-               diag::note_lambda_decl);
-        // FIXME: If we error out because an outer lambda can not implicitly
-        // capture a variable that an inner lambda explicitly captures, we
-        // should have the inner lambda do the explicit capture - because
-        // it makes for cleaner diagnostics later.  This would purely be done
-        // so that the diagnostic does not misleadingly claim that a variable
-        // can not be captured by a lambda implicitly even though it is captured
-        // explicitly.  Suggestion:
-        //  - create const bool VariableCaptureWasInitiallyExplicit = Explicit
-        //    at the function head
-        //  - cache the StartingDeclContext - this must be a lambda
-        //  - captureInLambda in the innermost lambda the variable.
-      }
-      return true;
-    }
-
-    FunctionScopesIndex--;
-    DC = ParentDC;
-    Explicit = false;
-  } while (!VarDC->Equals(DC));
-
-  // Walk back down the scope stack, (e.g. from outer lambda to inner lambda)
-  // computing the type of the capture at each step, checking type-specific
-  // requirements, and adding captures if requested.
-  // If the variable had already been captured previously, we start capturing
-  // at the lambda nested within that one.
-  for (unsigned I = ++FunctionScopesIndex, N = MaxFunctionScopesIndex + 1; I != N;
-       ++I) {
-    CapturingScopeInfo *CSI = cast<CapturingScopeInfo>(FunctionScopes[I]);
-
-    if (BlockScopeInfo *BSI = dyn_cast<BlockScopeInfo>(CSI)) {
-      if (!captureInBlock(BSI, Var, ExprLoc,
-                          BuildAndDiagnose, CaptureType,
-                          DeclRefType, Nested, *this))
-        return true;
-      Nested = true;
-    } else if (CapturedRegionScopeInfo *RSI = dyn_cast<CapturedRegionScopeInfo>(CSI)) {
-      if (!captureInCapturedRegion(RSI, Var, ExprLoc,
-                                   BuildAndDiagnose, CaptureType,
-                                   DeclRefType, Nested, *this))
-        return true;
-      Nested = true;
-    } else {
-      LambdaScopeInfo *LSI = cast<LambdaScopeInfo>(CSI);
-      if (!captureInLambda(LSI, Var, ExprLoc,
-                           BuildAndDiagnose, CaptureType,
-                           DeclRefType, Nested, Kind, EllipsisLoc,
-                            /*IsTopScope*/I == N - 1, *this))
-        return true;
-      Nested = true;
-    }
-  }
-  return false;
-}
-
-bool Sema::tryCaptureVariable(VarDecl *Var, SourceLocation Loc,
-                              TryCaptureKind Kind, SourceLocation EllipsisLoc) {
-  QualType CaptureType;
-  QualType DeclRefType;
-  return tryCaptureVariable(Var, Loc, Kind, EllipsisLoc,
-                            /*BuildAndDiagnose=*/true, CaptureType,
-                            DeclRefType, nullptr);
-}
-
-bool Sema::NeedToCaptureVariable(VarDecl *Var, SourceLocation Loc) {
-  QualType CaptureType;
-  QualType DeclRefType;
-  return !tryCaptureVariable(Var, Loc, TryCapture_Implicit, SourceLocation(),
-                             /*BuildAndDiagnose=*/false, CaptureType,
-                             DeclRefType, nullptr);
-}
-
-QualType Sema::getCapturedDeclRefType(VarDecl *Var, SourceLocation Loc) {
-  QualType CaptureType;
-  QualType DeclRefType;
-
-  // Determine whether we can capture this variable.
-  if (tryCaptureVariable(Var, Loc, TryCapture_Implicit, SourceLocation(),
-                         /*BuildAndDiagnose=*/false, CaptureType,
-                         DeclRefType, nullptr))
-    return QualType();
-
-  return DeclRefType;
-}
-
-
-
-// If either the type of the variable or the initializer is dependent,
-// return false. Otherwise, determine whether the variable is a constant
-// expression. Use this if you need to know if a variable that might or
-// might not be dependent is truly a constant expression.
-static inline bool IsVariableNonDependentAndAConstantExpression(VarDecl *Var,
-    ASTContext &Context) {
-
-  if (Var->getType()->isDependentType())
-    return false;
-  const VarDecl *DefVD = nullptr;
-  Var->getAnyInitializer(DefVD);
-  if (!DefVD)
-    return false;
-  EvaluatedStmt *Eval = DefVD->ensureEvaluatedStmt();
-  Expr *Init = cast<Expr>(Eval->Value);
-  if (Init->isValueDependent())
-    return false;
-  return IsVariableAConstantExpression(Var, Context);
-}
-
-
-void Sema::UpdateMarkingForLValueToRValue(Expr *E) {
-  // Per C++11 [basic.def.odr], a variable is odr-used "unless it is
-  // an object that satisfies the requirements for appearing in a
-  // constant expression (5.19) and the lvalue-to-rvalue conversion (4.1)
-  // is immediately applied."  This function handles the lvalue-to-rvalue
-  // conversion part.
-  MaybeODRUseExprs.erase(E->IgnoreParens());
-
-  // If we are in a lambda, check if this DeclRefExpr or MemberExpr refers
-  // to a variable that is a constant expression, and if so, identify it as
-  // a reference to a variable that does not involve an odr-use of that
-  // variable.
-  if (LambdaScopeInfo *LSI = getCurLambda()) {
-    Expr *SansParensExpr = E->IgnoreParens();
-    VarDecl *Var = nullptr;
-    if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(SansParensExpr))
-      Var = dyn_cast<VarDecl>(DRE->getFoundDecl());
-    else if (MemberExpr *ME = dyn_cast<MemberExpr>(SansParensExpr))
-      Var = dyn_cast<VarDecl>(ME->getMemberDecl());
-
-    if (Var && IsVariableNonDependentAndAConstantExpression(Var, Context))
-      LSI->markVariableExprAsNonODRUsed(SansParensExpr);
-  }
-}
-
-ExprResult Sema::ActOnConstantExpression(ExprResult Res) {
-  Res = CorrectDelayedTyposInExpr(Res);
-
-  if (!Res.isUsable())
-    return Res;
-
-  // If a constant-expression is a reference to a variable where we delay
-  // deciding whether it is an odr-use, just assume we will apply the
-  // lvalue-to-rvalue conversion.  In the one case where this doesn't happen
-  // (a non-type template argument), we have special handling anyway.
-  UpdateMarkingForLValueToRValue(Res.get());
-  return Res;
-}
-
-void Sema::CleanupVarDeclMarking() {
-  for (Expr *E : MaybeODRUseExprs) {
-    VarDecl *Var;
-    SourceLocation Loc;
-    if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E)) {
-      Var = cast<VarDecl>(DRE->getDecl());
-      Loc = DRE->getLocation();
-    } else if (MemberExpr *ME = dyn_cast<MemberExpr>(E)) {
-      Var = cast<VarDecl>(ME->getMemberDecl());
-      Loc = ME->getMemberLoc();
-    } else {
-      llvm_unreachable("Unexpected expression");
-    }
-
-    MarkVarDeclODRUsed(Var, Loc, *this,
-                       /*MaxFunctionScopeIndex Pointer*/ nullptr);
-  }
-
-  MaybeODRUseExprs.clear();
-}
-
-
-static void DoMarkVarDeclReferenced(Sema &SemaRef, SourceLocation Loc,
-                                    VarDecl *Var, Expr *E) {
-  assert((!E || isa<DeclRefExpr>(E) || isa<MemberExpr>(E)) &&
-         "Invalid Expr argument to DoMarkVarDeclReferenced");
-  Var->setReferenced();
-
-  TemplateSpecializationKind TSK = Var->getTemplateSpecializationKind();
-
-  bool OdrUseContext = isOdrUseContext(SemaRef);
-  bool UsableInConstantExpr =
-      Var->isUsableInConstantExpressions(SemaRef.Context);
-  bool NeedDefinition =
-      OdrUseContext || (isEvaluatableContext(SemaRef) && UsableInConstantExpr);
-
-  VarTemplateSpecializationDecl *VarSpec =
-      dyn_cast<VarTemplateSpecializationDecl>(Var);
-  assert(!isa<VarTemplatePartialSpecializationDecl>(Var) &&
-         "Can't instantiate a partial template specialization.");
-
-  // If this might be a member specialization of a static data member, check
-  // the specialization is visible. We already did the checks for variable
-  // template specializations when we created them.
-  if (NeedDefinition && TSK != TSK_Undeclared &&
-      !isa<VarTemplateSpecializationDecl>(Var))
-    SemaRef.checkSpecializationVisibility(Loc, Var);
-
-  // Perform implicit instantiation of static data members, static data member
-  // templates of class templates, and variable template specializations. Delay
-  // instantiations of variable templates, except for those that could be used
-  // in a constant expression.
-  if (NeedDefinition && isTemplateInstantiation(TSK)) {
-    // Per C++17 [temp.explicit]p10, we may instantiate despite an explicit
-    // instantiation declaration if a variable is usable in a constant
-    // expression (among other cases).
-    bool TryInstantiating =
-        TSK == TSK_ImplicitInstantiation ||
-        (TSK == TSK_ExplicitInstantiationDeclaration && UsableInConstantExpr);
-
-    if (TryInstantiating) {
-      SourceLocation PointOfInstantiation = Var->getPointOfInstantiation();
-      bool FirstInstantiation = PointOfInstantiation.isInvalid();
-      if (FirstInstantiation) {
-        PointOfInstantiation = Loc;
-        Var->setTemplateSpecializationKind(TSK, PointOfInstantiation);
-      }
-
-      bool InstantiationDependent = false;
-      bool IsNonDependent =
-          VarSpec ? !TemplateSpecializationType::anyDependentTemplateArguments(
-                        VarSpec->getTemplateArgsInfo(), InstantiationDependent)
-                  : true;
-
-      // Do not instantiate specializations that are still type-dependent.
-      if (IsNonDependent) {
-        if (UsableInConstantExpr) {
-          // Do not defer instantiations of variables that could be used in a
-          // constant expression.
-          SemaRef.InstantiateVariableDefinition(PointOfInstantiation, Var);
-        } else if (FirstInstantiation ||
-                   isa<VarTemplateSpecializationDecl>(Var)) {
-          // FIXME: For a specialization of a variable template, we don't
-          // distinguish between "declaration and type implicitly instantiated"
-          // and "implicit instantiation of definition requested", so we have
-          // no direct way to avoid enqueueing the pending instantiation
-          // multiple times.
-          SemaRef.PendingInstantiations
-              .push_back(std::make_pair(Var, PointOfInstantiation));
-        }
-      }
-    }
-  }
-
-  // Per C++11 [basic.def.odr], a variable is odr-used "unless it satisfies
-  // the requirements for appearing in a constant expression (5.19) and, if
-  // it is an object, the lvalue-to-rvalue conversion (4.1)
-  // is immediately applied."  We check the first part here, and
-  // Sema::UpdateMarkingForLValueToRValue deals with the second part.
-  // Note that we use the C++11 definition everywhere because nothing in
-  // C++03 depends on whether we get the C++03 version correct. The second
-  // part does not apply to references, since they are not objects.
-  if (OdrUseContext && E &&
-      IsVariableAConstantExpression(Var, SemaRef.Context)) {
-    // A reference initialized by a constant expression can never be
-    // odr-used, so simply ignore it.
-    if (!Var->getType()->isReferenceType() ||
-        (SemaRef.LangOpts.OpenMP && SemaRef.isOpenMPCapturedDecl(Var)))
-      SemaRef.MaybeODRUseExprs.insert(E);
-  } else if (OdrUseContext) {
-    MarkVarDeclODRUsed(Var, Loc, SemaRef,
-                       /*MaxFunctionScopeIndex ptr*/ nullptr);
-  } else if (isOdrUseContext(SemaRef, /*SkipDependentUses*/false)) {
-    // If this is a dependent context, we don't need to mark variables as
-    // odr-used, but we may still need to track them for lambda capture.
-    // FIXME: Do we also need to do this inside dependent typeid expressions
-    // (which are modeled as unevaluated at this point)?
-    const bool RefersToEnclosingScope =
-        (SemaRef.CurContext != Var->getDeclContext() &&
-         Var->getDeclContext()->isFunctionOrMethod() && Var->hasLocalStorage());
-    if (RefersToEnclosingScope) {
-      LambdaScopeInfo *const LSI =
-          SemaRef.getCurLambda(/*IgnoreNonLambdaCapturingScope=*/true);
-      if (LSI && (!LSI->CallOperator ||
-                  !LSI->CallOperator->Encloses(Var->getDeclContext()))) {
-        // If a variable could potentially be odr-used, defer marking it so
-        // until we finish analyzing the full expression for any
-        // lvalue-to-rvalue
-        // or discarded value conversions that would obviate odr-use.
-        // Add it to the list of potential captures that will be analyzed
-        // later (ActOnFinishFullExpr) for eventual capture and odr-use marking
-        // unless the variable is a reference that was initialized by a constant
-        // expression (this will never need to be captured or odr-used).
-        assert(E && "Capture variable should be used in an expression.");
-        if (!Var->getType()->isReferenceType() ||
-            !IsVariableNonDependentAndAConstantExpression(Var, SemaRef.Context))
-          LSI->addPotentialCapture(E->IgnoreParens());
-      }
-    }
-  }
-}
-
-/// Mark a variable referenced, and check whether it is odr-used
-/// (C++ [basic.def.odr]p2, C99 6.9p3).  Note that this should not be
-/// used directly for normal expressions referring to VarDecl.
-void Sema::MarkVariableReferenced(SourceLocation Loc, VarDecl *Var) {
-  DoMarkVarDeclReferenced(*this, Loc, Var, nullptr);
-}
-
-static void MarkExprReferenced(Sema &SemaRef, SourceLocation Loc,
-                               Decl *D, Expr *E, bool MightBeOdrUse) {
-  if (SemaRef.isInOpenMPDeclareTargetContext())
-    SemaRef.checkDeclIsAllowedInOpenMPTarget(E, D);
-
-  if (VarDecl *Var = dyn_cast<VarDecl>(D)) {
-    DoMarkVarDeclReferenced(SemaRef, Loc, Var, E);
-    return;
-  }
-
-  SemaRef.MarkAnyDeclReferenced(Loc, D, MightBeOdrUse);
-
-  // If this is a call to a method via a cast, also mark the method in the
-  // derived class used in case codegen can devirtualize the call.
-  const MemberExpr *ME = dyn_cast<MemberExpr>(E);
-  if (!ME)
-    return;
-  CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(ME->getMemberDecl());
-  if (!MD)
-    return;
-  // Only attempt to devirtualize if this is truly a virtual call.
-  bool IsVirtualCall = MD->isVirtual() &&
-                          ME->performsVirtualDispatch(SemaRef.getLangOpts());
-  if (!IsVirtualCall)
-    return;
-
-  // If it's possible to devirtualize the call, mark the called function
-  // referenced.
-  CXXMethodDecl *DM = MD->getDevirtualizedMethod(
-      ME->getBase(), SemaRef.getLangOpts().AppleKext);
-  if (DM)
-    SemaRef.MarkAnyDeclReferenced(Loc, DM, MightBeOdrUse);
-}
-
-/// Perform reference-marking and odr-use handling for a DeclRefExpr.
-void Sema::MarkDeclRefReferenced(DeclRefExpr *E, const Expr *Base) {
-  // TODO: update this with DR# once a defect report is filed.
-  // C++11 defect. The address of a pure member should not be an ODR use, even
-  // if it's a qualified reference.
-  bool OdrUse = true;
-  if (const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(E->getDecl()))
-    if (Method->isVirtual() &&
-        !Method->getDevirtualizedMethod(Base, getLangOpts().AppleKext))
-      OdrUse = false;
-  MarkExprReferenced(*this, E->getLocation(), E->getDecl(), E, OdrUse);
-}
-
-/// Perform reference-marking and odr-use handling for a MemberExpr.
-void Sema::MarkMemberReferenced(MemberExpr *E) {
-  // C++11 [basic.def.odr]p2:
-  //   A non-overloaded function whose name appears as a potentially-evaluated
-  //   expression or a member of a set of candidate functions, if selected by
-  //   overload resolution when referred to from a potentially-evaluated
-  //   expression, is odr-used, unless it is a pure virtual function and its
-  //   name is not explicitly qualified.
-  bool MightBeOdrUse = true;
-  if (E->performsVirtualDispatch(getLangOpts())) {
-    if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(E->getMemberDecl()))
-      if (Method->isPure())
-        MightBeOdrUse = false;
-  }
-  SourceLocation Loc =
-      E->getMemberLoc().isValid() ? E->getMemberLoc() : E->getBeginLoc();
-  MarkExprReferenced(*this, Loc, E->getMemberDecl(), E, MightBeOdrUse);
-}
-
-/// Perform marking for a reference to an arbitrary declaration.  It
-/// marks the declaration referenced, and performs odr-use checking for
-/// functions and variables. This method should not be used when building a
-/// normal expression which refers to a variable.
-void Sema::MarkAnyDeclReferenced(SourceLocation Loc, Decl *D,
-                                 bool MightBeOdrUse) {
-  if (MightBeOdrUse) {
-    if (auto *VD = dyn_cast<VarDecl>(D)) {
-      MarkVariableReferenced(Loc, VD);
-      return;
-    }
-  }
-  if (auto *FD = dyn_cast<FunctionDecl>(D)) {
-    MarkFunctionReferenced(Loc, FD, MightBeOdrUse);
-    return;
-  }
-  D->setReferenced();
-}
-
-namespace {
-  // Mark all of the declarations used by a type as referenced.
-  // FIXME: Not fully implemented yet! We need to have a better understanding
-  // of when we're entering a context we should not recurse into.
-  // FIXME: This is and EvaluatedExprMarker are more-or-less equivalent to
-  // TreeTransforms rebuilding the type in a new context. Rather than
-  // duplicating the TreeTransform logic, we should consider reusing it here.
-  // Currently that causes problems when rebuilding LambdaExprs.
-  class MarkReferencedDecls : public RecursiveASTVisitor<MarkReferencedDecls> {
-    Sema &S;
-    SourceLocation Loc;
-
-  public:
-    typedef RecursiveASTVisitor<MarkReferencedDecls> Inherited;
-
-    MarkReferencedDecls(Sema &S, SourceLocation Loc) : S(S), Loc(Loc) { }
-
-    bool TraverseTemplateArgument(const TemplateArgument &Arg);
-  };
-}
-
-bool MarkReferencedDecls::TraverseTemplateArgument(
-    const TemplateArgument &Arg) {
-  {
-    // A non-type template argument is a constant-evaluated context.
-    EnterExpressionEvaluationContext Evaluated(
-        S, Sema::ExpressionEvaluationContext::ConstantEvaluated);
-    if (Arg.getKind() == TemplateArgument::Declaration) {
-      if (Decl *D = Arg.getAsDecl())
-        S.MarkAnyDeclReferenced(Loc, D, true);
-    } else if (Arg.getKind() == TemplateArgument::Expression) {
-      S.MarkDeclarationsReferencedInExpr(Arg.getAsExpr(), false);
-    }
-  }
-
-  return Inherited::TraverseTemplateArgument(Arg);
-}
-
-void Sema::MarkDeclarationsReferencedInType(SourceLocation Loc, QualType T) {
-  MarkReferencedDecls Marker(*this, Loc);
-  Marker.TraverseType(T);
-}
-
-namespace {
-  /// Helper class that marks all of the declarations referenced by
-  /// potentially-evaluated subexpressions as "referenced".
-  class EvaluatedExprMarker : public EvaluatedExprVisitor<EvaluatedExprMarker> {
-    Sema &S;
-    bool SkipLocalVariables;
-
-  public:
-    typedef EvaluatedExprVisitor<EvaluatedExprMarker> Inherited;
-
-    EvaluatedExprMarker(Sema &S, bool SkipLocalVariables)
-      : Inherited(S.Context), S(S), SkipLocalVariables(SkipLocalVariables) { }
-
-    void VisitDeclRefExpr(DeclRefExpr *E) {
-      // If we were asked not to visit local variables, don't.
-      if (SkipLocalVariables) {
-        if (VarDecl *VD = dyn_cast<VarDecl>(E->getDecl()))
-          if (VD->hasLocalStorage())
-            return;
-      }
-
-      S.MarkDeclRefReferenced(E);
-    }
-
-    void VisitMemberExpr(MemberExpr *E) {
-      S.MarkMemberReferenced(E);
-      Inherited::VisitMemberExpr(E);
-    }
-
-    void VisitCXXBindTemporaryExpr(CXXBindTemporaryExpr *E) {
-      S.MarkFunctionReferenced(
-          E->getBeginLoc(),
-          const_cast<CXXDestructorDecl *>(E->getTemporary()->getDestructor()));
-      Visit(E->getSubExpr());
-    }
-
-    void VisitCXXNewExpr(CXXNewExpr *E) {
-      if (E->getOperatorNew())
-        S.MarkFunctionReferenced(E->getBeginLoc(), E->getOperatorNew());
-      if (E->getOperatorDelete())
-        S.MarkFunctionReferenced(E->getBeginLoc(), E->getOperatorDelete());
-      Inherited::VisitCXXNewExpr(E);
-    }
-
-    void VisitCXXDeleteExpr(CXXDeleteExpr *E) {
-      if (E->getOperatorDelete())
-        S.MarkFunctionReferenced(E->getBeginLoc(), E->getOperatorDelete());
-      QualType Destroyed = S.Context.getBaseElementType(E->getDestroyedType());
-      if (const RecordType *DestroyedRec = Destroyed->getAs<RecordType>()) {
-        CXXRecordDecl *Record = cast<CXXRecordDecl>(DestroyedRec->getDecl());
-        S.MarkFunctionReferenced(E->getBeginLoc(), S.LookupDestructor(Record));
-      }
-
-      Inherited::VisitCXXDeleteExpr(E);
-    }
-
-    void VisitCXXConstructExpr(CXXConstructExpr *E) {
-      S.MarkFunctionReferenced(E->getBeginLoc(), E->getConstructor());
-      Inherited::VisitCXXConstructExpr(E);
-    }
-
-    void VisitCXXDefaultArgExpr(CXXDefaultArgExpr *E) {
-      Visit(E->getExpr());
-    }
-
-    void VisitImplicitCastExpr(ImplicitCastExpr *E) {
-      Inherited::VisitImplicitCastExpr(E);
-
-      if (E->getCastKind() == CK_LValueToRValue)
-        S.UpdateMarkingForLValueToRValue(E->getSubExpr());
-    }
-  };
-}
-
-/// Mark any declarations that appear within this expression or any
-/// potentially-evaluated subexpressions as "referenced".
-///
-/// \param SkipLocalVariables If true, don't mark local variables as
-/// 'referenced'.
-void Sema::MarkDeclarationsReferencedInExpr(Expr *E,
-                                            bool SkipLocalVariables) {
-  EvaluatedExprMarker(*this, SkipLocalVariables).Visit(E);
-}
-
-/// Emit a diagnostic that describes an effect on the run-time behavior
-/// of the program being compiled.
-///
-/// This routine emits the given diagnostic when the code currently being
-/// type-checked is "potentially evaluated", meaning that there is a
-/// possibility that the code will actually be executable. Code in sizeof()
-/// expressions, code used only during overload resolution, etc., are not
-/// potentially evaluated. This routine will suppress such diagnostics or,
-/// in the absolutely nutty case of potentially potentially evaluated
-/// expressions (C++ typeid), queue the diagnostic to potentially emit it
-/// later.
-///
-/// This routine should be used for all diagnostics that describe the run-time
-/// behavior of a program, such as passing a non-POD value through an ellipsis.
-/// Failure to do so will likely result in spurious diagnostics or failures
-/// during overload resolution or within sizeof/alignof/typeof/typeid.
-bool Sema::DiagRuntimeBehavior(SourceLocation Loc, const Stmt *Statement,
-                               const PartialDiagnostic &PD) {
-  switch (ExprEvalContexts.back().Context) {
-  case ExpressionEvaluationContext::Unevaluated:
-  case ExpressionEvaluationContext::UnevaluatedList:
-  case ExpressionEvaluationContext::UnevaluatedAbstract:
-  case ExpressionEvaluationContext::DiscardedStatement:
-    // The argument will never be evaluated, so don't complain.
-    break;
-
-  case ExpressionEvaluationContext::ConstantEvaluated:
-    // Relevant diagnostics should be produced by constant evaluation.
-    break;
-
-  case ExpressionEvaluationContext::PotentiallyEvaluated:
-  case ExpressionEvaluationContext::PotentiallyEvaluatedIfUsed:
-    if (Statement && getCurFunctionOrMethodDecl()) {
-      FunctionScopes.back()->PossiblyUnreachableDiags.
-        push_back(sema::PossiblyUnreachableDiag(PD, Loc, Statement));
-      return true;
-    }
-
-    // The initializer of a constexpr variable or of the first declaration of a
-    // static data member is not syntactically a constant evaluated constant,
-    // but nonetheless is always required to be a constant expression, so we
-    // can skip diagnosing.
-    // FIXME: Using the mangling context here is a hack.
-    if (auto *VD = dyn_cast_or_null<VarDecl>(
-            ExprEvalContexts.back().ManglingContextDecl)) {
-      if (VD->isConstexpr() ||
-          (VD->isStaticDataMember() && VD->isFirstDecl() && !VD->isInline()))
-        break;
-      // FIXME: For any other kind of variable, we should build a CFG for its
-      // initializer and check whether the context in question is reachable.
-    }
-
-    Diag(Loc, PD);
-    return true;
-  }
-
-  return false;
-}
-
-bool Sema::CheckCallReturnType(QualType ReturnType, SourceLocation Loc,
-                               CallExpr *CE, FunctionDecl *FD) {
-  if (ReturnType->isVoidType() || !ReturnType->isIncompleteType())
-    return false;
-
-  // If we're inside a decltype's expression, don't check for a valid return
-  // type or construct temporaries until we know whether this is the last call.
-  if (ExprEvalContexts.back().ExprContext ==
-      ExpressionEvaluationContextRecord::EK_Decltype) {
-    ExprEvalContexts.back().DelayedDecltypeCalls.push_back(CE);
-    return false;
-  }
-
-  class CallReturnIncompleteDiagnoser : public TypeDiagnoser {
-    FunctionDecl *FD;
-    CallExpr *CE;
-
-  public:
-    CallReturnIncompleteDiagnoser(FunctionDecl *FD, CallExpr *CE)
-      : FD(FD), CE(CE) { }
-
-    void diagnose(Sema &S, SourceLocation Loc, QualType T) override {
-      if (!FD) {
-        S.Diag(Loc, diag::err_call_incomplete_return)
-          << T << CE->getSourceRange();
-        return;
-      }
-
-      S.Diag(Loc, diag::err_call_function_incomplete_return)
-        << CE->getSourceRange() << FD->getDeclName() << T;
-      S.Diag(FD->getLocation(), diag::note_entity_declared_at)
-          << FD->getDeclName();
-    }
-  } Diagnoser(FD, CE);
-
-  if (RequireCompleteType(Loc, ReturnType, Diagnoser))
-    return true;
-
-  return false;
-}
-
-// Diagnose the s/=/==/ and s/\|=/!=/ typos. Note that adding parentheses
-// will prevent this condition from triggering, which is what we want.
-void Sema::DiagnoseAssignmentAsCondition(Expr *E) {
-  SourceLocation Loc;
-
-  unsigned diagnostic = diag::warn_condition_is_assignment;
-  bool IsOrAssign = false;
-
-  if (BinaryOperator *Op = dyn_cast<BinaryOperator>(E)) {
-    if (Op->getOpcode() != BO_Assign && Op->getOpcode() != BO_OrAssign)
-      return;
-
-    IsOrAssign = Op->getOpcode() == BO_OrAssign;
-
-    // Greylist some idioms by putting them into a warning subcategory.
-    if (ObjCMessageExpr *ME
-          = dyn_cast<ObjCMessageExpr>(Op->getRHS()->IgnoreParenCasts())) {
-      Selector Sel = ME->getSelector();
-
-      // self = [<foo> init...]
-      if (isSelfExpr(Op->getLHS()) && ME->getMethodFamily() == OMF_init)
-        diagnostic = diag::warn_condition_is_idiomatic_assignment;
-
-      // <foo> = [<bar> nextObject]
-      else if (Sel.isUnarySelector() && Sel.getNameForSlot(0) == "nextObject")
-        diagnostic = diag::warn_condition_is_idiomatic_assignment;
-    }
-
-    Loc = Op->getOperatorLoc();
-  } else if (CXXOperatorCallExpr *Op = dyn_cast<CXXOperatorCallExpr>(E)) {
-    if (Op->getOperator() != OO_Equal && Op->getOperator() != OO_PipeEqual)
-      return;
-
-    IsOrAssign = Op->getOperator() == OO_PipeEqual;
-    Loc = Op->getOperatorLoc();
-  } else if (PseudoObjectExpr *POE = dyn_cast<PseudoObjectExpr>(E))
-    return DiagnoseAssignmentAsCondition(POE->getSyntacticForm());
-  else {
-    // Not an assignment.
-    return;
-  }
-
-  Diag(Loc, diagnostic) << E->getSourceRange();
-
-  SourceLocation Open = E->getBeginLoc();
-  SourceLocation Close = getLocForEndOfToken(E->getSourceRange().getEnd());
-  Diag(Loc, diag::note_condition_assign_silence)
-        << FixItHint::CreateInsertion(Open, "(")
-        << FixItHint::CreateInsertion(Close, ")");
-
-  if (IsOrAssign)
-    Diag(Loc, diag::note_condition_or_assign_to_comparison)
-      << FixItHint::CreateReplacement(Loc, "!=");
-  else
-    Diag(Loc, diag::note_condition_assign_to_comparison)
-      << FixItHint::CreateReplacement(Loc, "==");
-}
-
-/// Redundant parentheses over an equality comparison can indicate
-/// that the user intended an assignment used as condition.
-void Sema::DiagnoseEqualityWithExtraParens(ParenExpr *ParenE) {
-  // Don't warn if the parens came from a macro.
-  SourceLocation parenLoc = ParenE->getBeginLoc();
-  if (parenLoc.isInvalid() || parenLoc.isMacroID())
-    return;
-  // Don't warn for dependent expressions.
-  if (ParenE->isTypeDependent())
-    return;
-
-  Expr *E = ParenE->IgnoreParens();
-
-  if (BinaryOperator *opE = dyn_cast<BinaryOperator>(E))
-    if (opE->getOpcode() == BO_EQ &&
-        opE->getLHS()->IgnoreParenImpCasts()->isModifiableLvalue(Context)
-                                                           == Expr::MLV_Valid) {
-      SourceLocation Loc = opE->getOperatorLoc();
-
-      Diag(Loc, diag::warn_equality_with_extra_parens) << E->getSourceRange();
-      SourceRange ParenERange = ParenE->getSourceRange();
-      Diag(Loc, diag::note_equality_comparison_silence)
-        << FixItHint::CreateRemoval(ParenERange.getBegin())
-        << FixItHint::CreateRemoval(ParenERange.getEnd());
-      Diag(Loc, diag::note_equality_comparison_to_assign)
-        << FixItHint::CreateReplacement(Loc, "=");
-    }
-}
-
-ExprResult Sema::CheckBooleanCondition(SourceLocation Loc, Expr *E,
-                                       bool IsConstexpr) {
-  DiagnoseAssignmentAsCondition(E);
-  if (ParenExpr *parenE = dyn_cast<ParenExpr>(E))
-    DiagnoseEqualityWithExtraParens(parenE);
-
-  ExprResult result = CheckPlaceholderExpr(E);
-  if (result.isInvalid()) return ExprError();
-  E = result.get();
-
-  if (!E->isTypeDependent()) {
-    if (getLangOpts().CPlusPlus)
-      return CheckCXXBooleanCondition(E, IsConstexpr); // C++ 6.4p4
-
-    ExprResult ERes = DefaultFunctionArrayLvalueConversion(E);
-    if (ERes.isInvalid())
-      return ExprError();
-    E = ERes.get();
-
-    QualType T = E->getType();
-    if (!T->isScalarType()) { // C99 6.8.4.1p1
-      Diag(Loc, diag::err_typecheck_statement_requires_scalar)
-        << T << E->getSourceRange();
-      return ExprError();
-    }
-    CheckBoolLikeConversion(E, Loc);
-  }
-
-  return E;
-}
-
-Sema::ConditionResult Sema::ActOnCondition(Scope *S, SourceLocation Loc,
-                                           Expr *SubExpr, ConditionKind CK) {
-  // Empty conditions are valid in for-statements.
-  if (!SubExpr)
-    return ConditionResult();
-
-  ExprResult Cond;
-  switch (CK) {
-  case ConditionKind::Boolean:
-    Cond = CheckBooleanCondition(Loc, SubExpr);
-    break;
-
-  case ConditionKind::ConstexprIf:
-    Cond = CheckBooleanCondition(Loc, SubExpr, true);
-    break;
-
-  case ConditionKind::Switch:
-    Cond = CheckSwitchCondition(Loc, SubExpr);
-    break;
-  }
-  if (Cond.isInvalid())
-    return ConditionError();
-
-  // FIXME: FullExprArg doesn't have an invalid bit, so check nullness instead.
-  FullExprArg FullExpr = MakeFullExpr(Cond.get(), Loc);
-  if (!FullExpr.get())
-    return ConditionError();
-
-  return ConditionResult(*this, nullptr, FullExpr,
-                         CK == ConditionKind::ConstexprIf);
-}
-
-namespace {
-  /// A visitor for rebuilding a call to an __unknown_any expression
-  /// to have an appropriate type.
-  struct RebuildUnknownAnyFunction
-    : StmtVisitor<RebuildUnknownAnyFunction, ExprResult> {
-
-    Sema &S;
-
-    RebuildUnknownAnyFunction(Sema &S) : S(S) {}
-
-    ExprResult VisitStmt(Stmt *S) {
-      llvm_unreachable("unexpected statement!");
-    }
-
-    ExprResult VisitExpr(Expr *E) {
-      S.Diag(E->getExprLoc(), diag::err_unsupported_unknown_any_call)
-        << E->getSourceRange();
-      return ExprError();
-    }
-
-    /// Rebuild an expression which simply semantically wraps another
-    /// expression which it shares the type and value kind of.
-    template <class T> ExprResult rebuildSugarExpr(T *E) {
-      ExprResult SubResult = Visit(E->getSubExpr());
-      if (SubResult.isInvalid()) return ExprError();
-
-      Expr *SubExpr = SubResult.get();
-      E->setSubExpr(SubExpr);
-      E->setType(SubExpr->getType());
-      E->setValueKind(SubExpr->getValueKind());
-      assert(E->getObjectKind() == OK_Ordinary);
-      return E;
-    }
-
-    ExprResult VisitParenExpr(ParenExpr *E) {
-      return rebuildSugarExpr(E);
-    }
-
-    ExprResult VisitUnaryExtension(UnaryOperator *E) {
-      return rebuildSugarExpr(E);
-    }
-
-    ExprResult VisitUnaryAddrOf(UnaryOperator *E) {
-      ExprResult SubResult = Visit(E->getSubExpr());
-      if (SubResult.isInvalid()) return ExprError();
-
-      Expr *SubExpr = SubResult.get();
-      E->setSubExpr(SubExpr);
-      E->setType(S.Context.getPointerType(SubExpr->getType()));
-      assert(E->getValueKind() == VK_RValue);
-      assert(E->getObjectKind() == OK_Ordinary);
-      return E;
-    }
-
-    ExprResult resolveDecl(Expr *E, ValueDecl *VD) {
-      if (!isa<FunctionDecl>(VD)) return VisitExpr(E);
-
-      E->setType(VD->getType());
-
-      assert(E->getValueKind() == VK_RValue);
-      if (S.getLangOpts().CPlusPlus &&
-          !(isa<CXXMethodDecl>(VD) &&
-            cast<CXXMethodDecl>(VD)->isInstance()))
-        E->setValueKind(VK_LValue);
-
-      return E;
-    }
-
-    ExprResult VisitMemberExpr(MemberExpr *E) {
-      return resolveDecl(E, E->getMemberDecl());
-    }
-
-    ExprResult VisitDeclRefExpr(DeclRefExpr *E) {
-      return resolveDecl(E, E->getDecl());
-    }
-  };
-}
-
-/// Given a function expression of unknown-any type, try to rebuild it
-/// to have a function type.
-static ExprResult rebuildUnknownAnyFunction(Sema &S, Expr *FunctionExpr) {
-  ExprResult Result = RebuildUnknownAnyFunction(S).Visit(FunctionExpr);
-  if (Result.isInvalid()) return ExprError();
-  return S.DefaultFunctionArrayConversion(Result.get());
-}
-
-namespace {
-  /// A visitor for rebuilding an expression of type __unknown_anytype
-  /// into one which resolves the type directly on the referring
-  /// expression.  Strict preservation of the original source
-  /// structure is not a goal.
-  struct RebuildUnknownAnyExpr
-    : StmtVisitor<RebuildUnknownAnyExpr, ExprResult> {
-
-    Sema &S;
-
-    /// The current destination type.
-    QualType DestType;
-
-    RebuildUnknownAnyExpr(Sema &S, QualType CastType)
-      : S(S), DestType(CastType) {}
-
-    ExprResult VisitStmt(Stmt *S) {
-      llvm_unreachable("unexpected statement!");
-    }
-
-    ExprResult VisitExpr(Expr *E) {
-      S.Diag(E->getExprLoc(), diag::err_unsupported_unknown_any_expr)
-        << E->getSourceRange();
-      return ExprError();
-    }
-
-    ExprResult VisitCallExpr(CallExpr *E);
-    ExprResult VisitObjCMessageExpr(ObjCMessageExpr *E);
-
-    /// Rebuild an expression which simply semantically wraps another
-    /// expression which it shares the type and value kind of.
-    template <class T> ExprResult rebuildSugarExpr(T *E) {
-      ExprResult SubResult = Visit(E->getSubExpr());
-      if (SubResult.isInvalid()) return ExprError();
-      Expr *SubExpr = SubResult.get();
-      E->setSubExpr(SubExpr);
-      E->setType(SubExpr->getType());
-      E->setValueKind(SubExpr->getValueKind());
-      assert(E->getObjectKind() == OK_Ordinary);
-      return E;
-    }
-
-    ExprResult VisitParenExpr(ParenExpr *E) {
-      return rebuildSugarExpr(E);
-    }
-
-    ExprResult VisitUnaryExtension(UnaryOperator *E) {
-      return rebuildSugarExpr(E);
-    }
-
-    ExprResult VisitUnaryAddrOf(UnaryOperator *E) {
-      const PointerType *Ptr = DestType->getAs<PointerType>();
-      if (!Ptr) {
-        S.Diag(E->getOperatorLoc(), diag::err_unknown_any_addrof)
-          << E->getSourceRange();
-        return ExprError();
-      }
-
-      if (isa<CallExpr>(E->getSubExpr())) {
-        S.Diag(E->getOperatorLoc(), diag::err_unknown_any_addrof_call)
-          << E->getSourceRange();
-        return ExprError();
-      }
-
-      assert(E->getValueKind() == VK_RValue);
-      assert(E->getObjectKind() == OK_Ordinary);
-      E->setType(DestType);
-
-      // Build the sub-expression as if it were an object of the pointee type.
-      DestType = Ptr->getPointeeType();
-      ExprResult SubResult = Visit(E->getSubExpr());
-      if (SubResult.isInvalid()) return ExprError();
-      E->setSubExpr(SubResult.get());
-      return E;
-    }
-
-    ExprResult VisitImplicitCastExpr(ImplicitCastExpr *E);
-
-    ExprResult resolveDecl(Expr *E, ValueDecl *VD);
-
-    ExprResult VisitMemberExpr(MemberExpr *E) {
-      return resolveDecl(E, E->getMemberDecl());
-    }
-
-    ExprResult VisitDeclRefExpr(DeclRefExpr *E) {
-      return resolveDecl(E, E->getDecl());
-    }
-  };
-}
-
-/// Rebuilds a call expression which yielded __unknown_anytype.
-ExprResult RebuildUnknownAnyExpr::VisitCallExpr(CallExpr *E) {
-  Expr *CalleeExpr = E->getCallee();
-
-  enum FnKind {
-    FK_MemberFunction,
-    FK_FunctionPointer,
-    FK_BlockPointer
-  };
-
-  FnKind Kind;
-  QualType CalleeType = CalleeExpr->getType();
-  if (CalleeType == S.Context.BoundMemberTy) {
-    assert(isa<CXXMemberCallExpr>(E) || isa<CXXOperatorCallExpr>(E));
-    Kind = FK_MemberFunction;
-    CalleeType = Expr::findBoundMemberType(CalleeExpr);
-  } else if (const PointerType *Ptr = CalleeType->getAs<PointerType>()) {
-    CalleeType = Ptr->getPointeeType();
-    Kind = FK_FunctionPointer;
-  } else {
-    CalleeType = CalleeType->castAs<BlockPointerType>()->getPointeeType();
-    Kind = FK_BlockPointer;
-  }
-  const FunctionType *FnType = CalleeType->castAs<FunctionType>();
-
-  // Verify that this is a legal result type of a function.
-  if (DestType->isArrayType() || DestType->isFunctionType()) {
-    unsigned diagID = diag::err_func_returning_array_function;
-    if (Kind == FK_BlockPointer)
-      diagID = diag::err_block_returning_array_function;
-
-    S.Diag(E->getExprLoc(), diagID)
-      << DestType->isFunctionType() << DestType;
-    return ExprError();
-  }
-
-  // Otherwise, go ahead and set DestType as the call's result.
-  E->setType(DestType.getNonLValueExprType(S.Context));
-  E->setValueKind(Expr::getValueKindForType(DestType));
-  assert(E->getObjectKind() == OK_Ordinary);
-
-  // Rebuild the function type, replacing the result type with DestType.
-  const FunctionProtoType *Proto = dyn_cast<FunctionProtoType>(FnType);
-  if (Proto) {
-    // __unknown_anytype(...) is a special case used by the debugger when
-    // it has no idea what a function's signature is.
-    //
-    // We want to build this call essentially under the K&R
-    // unprototyped rules, but making a FunctionNoProtoType in C++
-    // would foul up all sorts of assumptions.  However, we cannot
-    // simply pass all arguments as variadic arguments, nor can we
-    // portably just call the function under a non-variadic type; see
-    // the comment on IR-gen's TargetInfo::isNoProtoCallVariadic.
-    // However, it turns out that in practice it is generally safe to
-    // call a function declared as "A foo(B,C,D);" under the prototype
-    // "A foo(B,C,D,...);".  The only known exception is with the
-    // Windows ABI, where any variadic function is implicitly cdecl
-    // regardless of its normal CC.  Therefore we change the parameter
-    // types to match the types of the arguments.
-    //
-    // This is a hack, but it is far superior to moving the
-    // corresponding target-specific code from IR-gen to Sema/AST.
-
-    ArrayRef<QualType> ParamTypes = Proto->getParamTypes();
-    SmallVector<QualType, 8> ArgTypes;
-    if (ParamTypes.empty() && Proto->isVariadic()) { // the special case
-      ArgTypes.reserve(E->getNumArgs());
-      for (unsigned i = 0, e = E->getNumArgs(); i != e; ++i) {
-        Expr *Arg = E->getArg(i);
-        QualType ArgType = Arg->getType();
-        if (E->isLValue()) {
-          ArgType = S.Context.getLValueReferenceType(ArgType);
-        } else if (E->isXValue()) {
-          ArgType = S.Context.getRValueReferenceType(ArgType);
-        }
-        ArgTypes.push_back(ArgType);
-      }
-      ParamTypes = ArgTypes;
-    }
-    DestType = S.Context.getFunctionType(DestType, ParamTypes,
-                                         Proto->getExtProtoInfo());
-  } else {
-    DestType = S.Context.getFunctionNoProtoType(DestType,
-                                                FnType->getExtInfo());
-  }
-
-  // Rebuild the appropriate pointer-to-function type.
-  switch (Kind) {
-  case FK_MemberFunction:
-    // Nothing to do.
-    break;
-
-  case FK_FunctionPointer:
-    DestType = S.Context.getPointerType(DestType);
-    break;
-
-  case FK_BlockPointer:
-    DestType = S.Context.getBlockPointerType(DestType);
-    break;
-  }
-
-  // Finally, we can recurse.
-  ExprResult CalleeResult = Visit(CalleeExpr);
-  if (!CalleeResult.isUsable()) return ExprError();
-  E->setCallee(CalleeResult.get());
-
-  // Bind a temporary if necessary.
-  return S.MaybeBindToTemporary(E);
-}
-
-ExprResult RebuildUnknownAnyExpr::VisitObjCMessageExpr(ObjCMessageExpr *E) {
-  // Verify that this is a legal result type of a call.
-  if (DestType->isArrayType() || DestType->isFunctionType()) {
-    S.Diag(E->getExprLoc(), diag::err_func_returning_array_function)
-      << DestType->isFunctionType() << DestType;
-    return ExprError();
-  }
-
-  // Rewrite the method result type if available.
-  if (ObjCMethodDecl *Method = E->getMethodDecl()) {
-    assert(Method->getReturnType() == S.Context.UnknownAnyTy);
-    Method->setReturnType(DestType);
-  }
-
-  // Change the type of the message.
-  E->setType(DestType.getNonReferenceType());
-  E->setValueKind(Expr::getValueKindForType(DestType));
-
-  return S.MaybeBindToTemporary(E);
-}
-
-ExprResult RebuildUnknownAnyExpr::VisitImplicitCastExpr(ImplicitCastExpr *E) {
-  // The only case we should ever see here is a function-to-pointer decay.
-  if (E->getCastKind() == CK_FunctionToPointerDecay) {
-    assert(E->getValueKind() == VK_RValue);
-    assert(E->getObjectKind() == OK_Ordinary);
-
-    E->setType(DestType);
-
-    // Rebuild the sub-expression as the pointee (function) type.
-    DestType = DestType->castAs<PointerType>()->getPointeeType();
-
-    ExprResult Result = Visit(E->getSubExpr());
-    if (!Result.isUsable()) return ExprError();
-
-    E->setSubExpr(Result.get());
-    return E;
-  } else if (E->getCastKind() == CK_LValueToRValue) {
-    assert(E->getValueKind() == VK_RValue);
-    assert(E->getObjectKind() == OK_Ordinary);
-
-    assert(isa<BlockPointerType>(E->getType()));
-
-    E->setType(DestType);
-
-    // The sub-expression has to be a lvalue reference, so rebuild it as such.
-    DestType = S.Context.getLValueReferenceType(DestType);
-
-    ExprResult Result = Visit(E->getSubExpr());
-    if (!Result.isUsable()) return ExprError();
-
-    E->setSubExpr(Result.get());
-    return E;
-  } else {
-    llvm_unreachable("Unhandled cast type!");
-  }
-}
-
-ExprResult RebuildUnknownAnyExpr::resolveDecl(Expr *E, ValueDecl *VD) {
-  ExprValueKind ValueKind = VK_LValue;
-  QualType Type = DestType;
-
-  // We know how to make this work for certain kinds of decls:
-
-  //  - functions
-  if (FunctionDecl *FD = dyn_cast<FunctionDecl>(VD)) {
-    if (const PointerType *Ptr = Type->getAs<PointerType>()) {
-      DestType = Ptr->getPointeeType();
-      ExprResult Result = resolveDecl(E, VD);
-      if (Result.isInvalid()) return ExprError();
-      return S.ImpCastExprToType(Result.get(), Type,
-                                 CK_FunctionToPointerDecay, VK_RValue);
-    }
-
-    if (!Type->isFunctionType()) {
-      S.Diag(E->getExprLoc(), diag::err_unknown_any_function)
-        << VD << E->getSourceRange();
-      return ExprError();
-    }
-    if (const FunctionProtoType *FT = Type->getAs<FunctionProtoType>()) {
-      // We must match the FunctionDecl's type to the hack introduced in
-      // RebuildUnknownAnyExpr::VisitCallExpr to vararg functions of unknown
-      // type. See the lengthy commentary in that routine.
-      QualType FDT = FD->getType();
-      const FunctionType *FnType = FDT->castAs<FunctionType>();
-      const FunctionProtoType *Proto = dyn_cast_or_null<FunctionProtoType>(FnType);
-      DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E);
-      if (DRE && Proto && Proto->getParamTypes().empty() && Proto->isVariadic()) {
-        SourceLocation Loc = FD->getLocation();
-        FunctionDecl *NewFD = FunctionDecl::Create(S.Context,
-                                      FD->getDeclContext(),
-                                      Loc, Loc, FD->getNameInfo().getName(),
-                                      DestType, FD->getTypeSourceInfo(),
-                                      SC_None, false/*isInlineSpecified*/,
-                                      FD->hasPrototype(),
-                                      false/*isConstexprSpecified*/);
-
-        if (FD->getQualifier())
-          NewFD->setQualifierInfo(FD->getQualifierLoc());
-
-        SmallVector<ParmVarDecl*, 16> Params;
-        for (const auto &AI : FT->param_types()) {
-          ParmVarDecl *Param =
-            S.BuildParmVarDeclForTypedef(FD, Loc, AI);
-          Param->setScopeInfo(0, Params.size());
-          Params.push_back(Param);
-        }
-        NewFD->setParams(Params);
-        DRE->setDecl(NewFD);
-        VD = DRE->getDecl();
-      }
-    }
-
-    if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD))
-      if (MD->isInstance()) {
-        ValueKind = VK_RValue;
-        Type = S.Context.BoundMemberTy;
-      }
-
-    // Function references aren't l-values in C.
-    if (!S.getLangOpts().CPlusPlus)
-      ValueKind = VK_RValue;
-
-  //  - variables
-  } else if (isa<VarDecl>(VD)) {
-    if (const ReferenceType *RefTy = Type->getAs<ReferenceType>()) {
-      Type = RefTy->getPointeeType();
-    } else if (Type->isFunctionType()) {
-      S.Diag(E->getExprLoc(), diag::err_unknown_any_var_function_type)
-        << VD << E->getSourceRange();
-      return ExprError();
-    }
-
-  //  - nothing else
-  } else {
-    S.Diag(E->getExprLoc(), diag::err_unsupported_unknown_any_decl)
-      << VD << E->getSourceRange();
-    return ExprError();
-  }
-
-  // Modifying the declaration like this is friendly to IR-gen but
-  // also really dangerous.
-  VD->setType(DestType);
-  E->setType(Type);
-  E->setValueKind(ValueKind);
-  return E;
-}
-
-/// Check a cast of an unknown-any type.  We intentionally only
-/// trigger this for C-style casts.
-ExprResult Sema::checkUnknownAnyCast(SourceRange TypeRange, QualType CastType,
-                                     Expr *CastExpr, CastKind &CastKind,
-                                     ExprValueKind &VK, CXXCastPath &Path) {
-  // The type we're casting to must be either void or complete.
-  if (!CastType->isVoidType() &&
-      RequireCompleteType(TypeRange.getBegin(), CastType,
-                          diag::err_typecheck_cast_to_incomplete))
-    return ExprError();
-
-  // Rewrite the casted expression from scratch.
-  ExprResult result = RebuildUnknownAnyExpr(*this, CastType).Visit(CastExpr);
-  if (!result.isUsable()) return ExprError();
-
-  CastExpr = result.get();
-  VK = CastExpr->getValueKind();
-  CastKind = CK_NoOp;
-
-  return CastExpr;
-}
-
-ExprResult Sema::forceUnknownAnyToType(Expr *E, QualType ToType) {
-  return RebuildUnknownAnyExpr(*this, ToType).Visit(E);
-}
-
-ExprResult Sema::checkUnknownAnyArg(SourceLocation callLoc,
-                                    Expr *arg, QualType &paramType) {
-  // If the syntactic form of the argument is not an explicit cast of
-  // any sort, just do default argument promotion.
-  ExplicitCastExpr *castArg = dyn_cast<ExplicitCastExpr>(arg->IgnoreParens());
-  if (!castArg) {
-    ExprResult result = DefaultArgumentPromotion(arg);
-    if (result.isInvalid()) return ExprError();
-    paramType = result.get()->getType();
-    return result;
-  }
-
-  // Otherwise, use the type that was written in the explicit cast.
-  assert(!arg->hasPlaceholderType());
-  paramType = castArg->getTypeAsWritten();
-
-  // Copy-initialize a parameter of that type.
-  InitializedEntity entity =
-    InitializedEntity::InitializeParameter(Context, paramType,
-                                           /*consumed*/ false);
-  return PerformCopyInitialization(entity, callLoc, arg);
-}
-
-static ExprResult diagnoseUnknownAnyExpr(Sema &S, Expr *E) {
-  Expr *orig = E;
-  unsigned diagID = diag::err_uncasted_use_of_unknown_any;
-  while (true) {
-    E = E->IgnoreParenImpCasts();
-    if (CallExpr *call = dyn_cast<CallExpr>(E)) {
-      E = call->getCallee();
-      diagID = diag::err_uncasted_call_of_unknown_any;
-    } else {
-      break;
-    }
-  }
-
-  SourceLocation loc;
-  NamedDecl *d;
-  if (DeclRefExpr *ref = dyn_cast<DeclRefExpr>(E)) {
-    loc = ref->getLocation();
-    d = ref->getDecl();
-  } else if (MemberExpr *mem = dyn_cast<MemberExpr>(E)) {
-    loc = mem->getMemberLoc();
-    d = mem->getMemberDecl();
-  } else if (ObjCMessageExpr *msg = dyn_cast<ObjCMessageExpr>(E)) {
-    diagID = diag::err_uncasted_call_of_unknown_any;
-    loc = msg->getSelectorStartLoc();
-    d = msg->getMethodDecl();
-    if (!d) {
-      S.Diag(loc, diag::err_uncasted_send_to_unknown_any_method)
-        << static_cast<unsigned>(msg->isClassMessage()) << msg->getSelector()
-        << orig->getSourceRange();
-      return ExprError();
-    }
-  } else {
-    S.Diag(E->getExprLoc(), diag::err_unsupported_unknown_any_expr)
-      << E->getSourceRange();
-    return ExprError();
-  }
-
-  S.Diag(loc, diagID) << d << orig->getSourceRange();
-
-  // Never recoverable.
-  return ExprError();
-}
-
-/// Check for operands with placeholder types and complain if found.
-/// Returns ExprError() if there was an error and no recovery was possible.
-ExprResult Sema::CheckPlaceholderExpr(Expr *E) {
-  if (!getLangOpts().CPlusPlus) {
-    // C cannot handle TypoExpr nodes on either side of a binop because it
-    // doesn't handle dependent types properly, so make sure any TypoExprs have
-    // been dealt with before checking the operands.
-    ExprResult Result = CorrectDelayedTyposInExpr(E);
-    if (!Result.isUsable()) return ExprError();
-    E = Result.get();
-  }
-
-  const BuiltinType *placeholderType = E->getType()->getAsPlaceholderType();
-  if (!placeholderType) return E;
-
-  switch (placeholderType->getKind()) {
-
-  // Overloaded expressions.
-  case BuiltinType::Overload: {
-    // Try to resolve a single function template specialization.
-    // This is obligatory.
-    ExprResult Result = E;
-    if (ResolveAndFixSingleFunctionTemplateSpecialization(Result, false))
-      return Result;
-
-    // No guarantees that ResolveAndFixSingleFunctionTemplateSpecialization
-    // leaves Result unchanged on failure.
-    Result = E;
-    if (resolveAndFixAddressOfOnlyViableOverloadCandidate(Result))
-      return Result;
-
-    // If that failed, try to recover with a call.
-    tryToRecoverWithCall(Result, PDiag(diag::err_ovl_unresolvable),
-                         /*complain*/ true);
-    return Result;
-  }
-
-  // Bound member functions.
-  case BuiltinType::BoundMember: {
-    ExprResult result = E;
-    const Expr *BME = E->IgnoreParens();
-    PartialDiagnostic PD = PDiag(diag::err_bound_member_function);
-    // Try to give a nicer diagnostic if it is a bound member that we recognize.
-    if (isa<CXXPseudoDestructorExpr>(BME)) {
-      PD = PDiag(diag::err_dtor_expr_without_call) << /*pseudo-destructor*/ 1;
-    } else if (const auto *ME = dyn_cast<MemberExpr>(BME)) {
-      if (ME->getMemberNameInfo().getName().getNameKind() ==
-          DeclarationName::CXXDestructorName)
-        PD = PDiag(diag::err_dtor_expr_without_call) << /*destructor*/ 0;
-    }
-    tryToRecoverWithCall(result, PD,
-                         /*complain*/ true);
-    return result;
-  }
-
-  // ARC unbridged casts.
-  case BuiltinType::ARCUnbridgedCast: {
-    Expr *realCast = stripARCUnbridgedCast(E);
-    diagnoseARCUnbridgedCast(realCast);
-    return realCast;
-  }
-
-  // Expressions of unknown type.
-  case BuiltinType::UnknownAny:
-    return diagnoseUnknownAnyExpr(*this, E);
-
-  // Pseudo-objects.
-  case BuiltinType::PseudoObject:
-    return checkPseudoObjectRValue(E);
-
-  case BuiltinType::BuiltinFn: {
-    // Accept __noop without parens by implicitly converting it to a call expr.
-    auto *DRE = dyn_cast<DeclRefExpr>(E->IgnoreParenImpCasts());
-    if (DRE) {
-      auto *FD = cast<FunctionDecl>(DRE->getDecl());
-      if (FD->getBuiltinID() == Builtin::BI__noop) {
-        E = ImpCastExprToType(E, Context.getPointerType(FD->getType()),
-                              CK_BuiltinFnToFnPtr)
-                .get();
-        return CallExpr::Create(Context, E, /*Args=*/{}, Context.IntTy,
-                                VK_RValue, SourceLocation());
-      }
-    }
-
-    Diag(E->getBeginLoc(), diag::err_builtin_fn_use);
-    return ExprError();
-  }
-
-  // Expressions of unknown type.
-  case BuiltinType::OMPArraySection:
-    Diag(E->getBeginLoc(), diag::err_omp_array_section_use);
-    return ExprError();
-
-  // Everything else should be impossible.
-#define IMAGE_TYPE(ImgType, Id, SingletonId, Access, Suffix) \
-  case BuiltinType::Id:
-#include "clang/Basic/OpenCLImageTypes.def"
-#define EXT_OPAQUE_TYPE(ExtType, Id, Ext) \
-  case BuiltinType::Id:
-#include "clang/Basic/OpenCLExtensionTypes.def"
-#define BUILTIN_TYPE(Id, SingletonId) case BuiltinType::Id:
-#define PLACEHOLDER_TYPE(Id, SingletonId)
-#include "clang/AST/BuiltinTypes.def"
-    break;
-  }
-
-  llvm_unreachable("invalid placeholder type!");
-}
-
-bool Sema::CheckCaseExpression(Expr *E) {
-  if (E->isTypeDependent())
-    return true;
-  if (E->isValueDependent() || E->isIntegerConstantExpr(Context))
-    return E->getType()->isIntegralOrEnumerationType();
-  return false;
-}
-
-/// ActOnObjCBoolLiteral - Parse {__objc_yes,__objc_no} literals.
-ExprResult
-Sema::ActOnObjCBoolLiteral(SourceLocation OpLoc, tok::TokenKind Kind) {
-  assert((Kind == tok::kw___objc_yes || Kind == tok::kw___objc_no) &&
-         "Unknown Objective-C Boolean value!");
-  QualType BoolT = Context.ObjCBuiltinBoolTy;
-  if (!Context.getBOOLDecl()) {
-    LookupResult Result(*this, &Context.Idents.get("BOOL"), OpLoc,
-                        Sema::LookupOrdinaryName);
-    if (LookupName(Result, getCurScope()) && Result.isSingleResult()) {
-      NamedDecl *ND = Result.getFoundDecl();
-      if (TypedefDecl *TD = dyn_cast<TypedefDecl>(ND))
-        Context.setBOOLDecl(TD);
-    }
-  }
-  if (Context.getBOOLDecl())
-    BoolT = Context.getBOOLType();
-  return new (Context)
-      ObjCBoolLiteralExpr(Kind == tok::kw___objc_yes, BoolT, OpLoc);
-}
-
-ExprResult Sema::ActOnObjCAvailabilityCheckExpr(
-    llvm::ArrayRef<AvailabilitySpec> AvailSpecs, SourceLocation AtLoc,
-    SourceLocation RParen) {
-
-  StringRef Platform = getASTContext().getTargetInfo().getPlatformName();
-
-  auto Spec = std::find_if(AvailSpecs.begin(), AvailSpecs.end(),
-                           [&](const AvailabilitySpec &Spec) {
-                             return Spec.getPlatform() == Platform;
-                           });
-
-  VersionTuple Version;
-  if (Spec != AvailSpecs.end())
-    Version = Spec->getVersion();
-
-  // The use of `@available` in the enclosing function should be analyzed to
-  // warn when it's used inappropriately (i.e. not if(@available)).
-  if (getCurFunctionOrMethodDecl())
-    getEnclosingFunction()->HasPotentialAvailabilityViolations = true;
-  else if (getCurBlock() || getCurLambda())
-    getCurFunction()->HasPotentialAvailabilityViolations = true;
-
-  return new (Context)
-      ObjCAvailabilityCheckExpr(Version, AtLoc, RParen, Context.BoolTy);
-}