Import LLVM 10.0.0 release including clang, lld and lldb.

ok hackroom
tested by plenty

1 files changed, 5179 insertions, 0 deletions

diff --git a/gnu/llvm/clang/lib/CodeGen/CGExpr.cpp b/gnu/llvm/clang/lib/CodeGen/CGExpr.cpp
new file mode 100644
index 00000000000..8e0604181fb
--- /dev/null
+++ b/gnu/llvm/clang/lib/CodeGen/CGExpr.cpp
@@ -0,0 +1,5179 @@
+//===--- CGExpr.cpp - Emit LLVM Code from Expressions ---------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// This contains code to emit Expr nodes as LLVM code.
+//
+//===----------------------------------------------------------------------===//
+
+#include "CGCXXABI.h"
+#include "CGCall.h"
+#include "CGCleanup.h"
+#include "CGDebugInfo.h"
+#include "CGObjCRuntime.h"
+#include "CGOpenMPRuntime.h"
+#include "CGRecordLayout.h"
+#include "CodeGenFunction.h"
+#include "CodeGenModule.h"
+#include "ConstantEmitter.h"
+#include "TargetInfo.h"
+#include "clang/AST/ASTContext.h"
+#include "clang/AST/Attr.h"
+#include "clang/AST/DeclObjC.h"
+#include "clang/AST/NSAPI.h"
+#include "clang/Basic/Builtins.h"
+#include "clang/Basic/CodeGenOptions.h"
+#include "llvm/ADT/Hashing.h"
+#include "llvm/ADT/StringExtras.h"
+#include "llvm/IR/DataLayout.h"
+#include "llvm/IR/Intrinsics.h"
+#include "llvm/IR/LLVMContext.h"
+#include "llvm/IR/MDBuilder.h"
+#include "llvm/Support/ConvertUTF.h"
+#include "llvm/Support/MathExtras.h"
+#include "llvm/Support/Path.h"
+#include "llvm/Transforms/Utils/SanitizerStats.h"
+
+#include <string>
+
+using namespace clang;
+using namespace CodeGen;
+
+//===--------------------------------------------------------------------===//
+//                        Miscellaneous Helper Methods
+//===--------------------------------------------------------------------===//
+
+llvm::Value *CodeGenFunction::EmitCastToVoidPtr(llvm::Value *value) {
+  unsigned addressSpace =
+      cast<llvm::PointerType>(value->getType())->getAddressSpace();
+
+  llvm::PointerType *destType = Int8PtrTy;
+  if (addressSpace)
+    destType = llvm::Type::getInt8PtrTy(getLLVMContext(), addressSpace);
+
+  if (value->getType() == destType) return value;
+  return Builder.CreateBitCast(value, destType);
+}
+
+/// CreateTempAlloca - This creates a alloca and inserts it into the entry
+/// block.
+Address CodeGenFunction::CreateTempAllocaWithoutCast(llvm::Type *Ty,
+                                                     CharUnits Align,
+                                                     const Twine &Name,
+                                                     llvm::Value *ArraySize) {
+  auto Alloca = CreateTempAlloca(Ty, Name, ArraySize);
+  Alloca->setAlignment(Align.getAsAlign());
+  return Address(Alloca, Align);
+}
+
+/// CreateTempAlloca - This creates a alloca and inserts it into the entry
+/// block. The alloca is casted to default address space if necessary.
+Address CodeGenFunction::CreateTempAlloca(llvm::Type *Ty, CharUnits Align,
+                                          const Twine &Name,
+                                          llvm::Value *ArraySize,
+                                          Address *AllocaAddr) {
+  auto Alloca = CreateTempAllocaWithoutCast(Ty, Align, Name, ArraySize);
+  if (AllocaAddr)
+    *AllocaAddr = Alloca;
+  llvm::Value *V = Alloca.getPointer();
+  // Alloca always returns a pointer in alloca address space, which may
+  // be different from the type defined by the language. For example,
+  // in C++ the auto variables are in the default address space. Therefore
+  // cast alloca to the default address space when necessary.
+  if (getASTAllocaAddressSpace() != LangAS::Default) {
+    auto DestAddrSpace = getContext().getTargetAddressSpace(LangAS::Default);
+    llvm::IRBuilderBase::InsertPointGuard IPG(Builder);
+    // When ArraySize is nullptr, alloca is inserted at AllocaInsertPt,
+    // otherwise alloca is inserted at the current insertion point of the
+    // builder.
+    if (!ArraySize)
+      Builder.SetInsertPoint(AllocaInsertPt);
+    V = getTargetHooks().performAddrSpaceCast(
+        *this, V, getASTAllocaAddressSpace(), LangAS::Default,
+        Ty->getPointerTo(DestAddrSpace), /*non-null*/ true);
+  }
+
+  return Address(V, Align);
+}
+
+/// CreateTempAlloca - This creates an alloca and inserts it into the entry
+/// block if \p ArraySize is nullptr, otherwise inserts it at the current
+/// insertion point of the builder.
+llvm::AllocaInst *CodeGenFunction::CreateTempAlloca(llvm::Type *Ty,
+                                                    const Twine &Name,
+                                                    llvm::Value *ArraySize) {
+  if (ArraySize)
+    return Builder.CreateAlloca(Ty, ArraySize, Name);
+  return new llvm::AllocaInst(Ty, CGM.getDataLayout().getAllocaAddrSpace(),
+                              ArraySize, Name, AllocaInsertPt);
+}
+
+/// CreateDefaultAlignTempAlloca - This creates an alloca with the
+/// default alignment of the corresponding LLVM type, which is *not*
+/// guaranteed to be related in any way to the expected alignment of
+/// an AST type that might have been lowered to Ty.
+Address CodeGenFunction::CreateDefaultAlignTempAlloca(llvm::Type *Ty,
+                                                      const Twine &Name) {
+  CharUnits Align =
+    CharUnits::fromQuantity(CGM.getDataLayout().getABITypeAlignment(Ty));
+  return CreateTempAlloca(Ty, Align, Name);
+}
+
+void CodeGenFunction::InitTempAlloca(Address Var, llvm::Value *Init) {
+  assert(isa<llvm::AllocaInst>(Var.getPointer()));
+  auto *Store = new llvm::StoreInst(Init, Var.getPointer());
+  Store->setAlignment(Var.getAlignment().getAsAlign());
+  llvm::BasicBlock *Block = AllocaInsertPt->getParent();
+  Block->getInstList().insertAfter(AllocaInsertPt->getIterator(), Store);
+}
+
+Address CodeGenFunction::CreateIRTemp(QualType Ty, const Twine &Name) {
+  CharUnits Align = getContext().getTypeAlignInChars(Ty);
+  return CreateTempAlloca(ConvertType(Ty), Align, Name);
+}
+
+Address CodeGenFunction::CreateMemTemp(QualType Ty, const Twine &Name,
+                                       Address *Alloca) {
+  // FIXME: Should we prefer the preferred type alignment here?
+  return CreateMemTemp(Ty, getContext().getTypeAlignInChars(Ty), Name, Alloca);
+}
+
+Address CodeGenFunction::CreateMemTemp(QualType Ty, CharUnits Align,
+                                       const Twine &Name, Address *Alloca) {
+  return CreateTempAlloca(ConvertTypeForMem(Ty), Align, Name,
+                          /*ArraySize=*/nullptr, Alloca);
+}
+
+Address CodeGenFunction::CreateMemTempWithoutCast(QualType Ty, CharUnits Align,
+                                                  const Twine &Name) {
+  return CreateTempAllocaWithoutCast(ConvertTypeForMem(Ty), Align, Name);
+}
+
+Address CodeGenFunction::CreateMemTempWithoutCast(QualType Ty,
+                                                  const Twine &Name) {
+  return CreateMemTempWithoutCast(Ty, getContext().getTypeAlignInChars(Ty),
+                                  Name);
+}
+
+/// EvaluateExprAsBool - Perform the usual unary conversions on the specified
+/// expression and compare the result against zero, returning an Int1Ty value.
+llvm::Value *CodeGenFunction::EvaluateExprAsBool(const Expr *E) {
+  PGO.setCurrentStmt(E);
+  if (const MemberPointerType *MPT = E->getType()->getAs<MemberPointerType>()) {
+    llvm::Value *MemPtr = EmitScalarExpr(E);
+    return CGM.getCXXABI().EmitMemberPointerIsNotNull(*this, MemPtr, MPT);
+  }
+
+  QualType BoolTy = getContext().BoolTy;
+  SourceLocation Loc = E->getExprLoc();
+  if (!E->getType()->isAnyComplexType())
+    return EmitScalarConversion(EmitScalarExpr(E), E->getType(), BoolTy, Loc);
+
+  return EmitComplexToScalarConversion(EmitComplexExpr(E), E->getType(), BoolTy,
+                                       Loc);
+}
+
+/// EmitIgnoredExpr - Emit code to compute the specified expression,
+/// ignoring the result.
+void CodeGenFunction::EmitIgnoredExpr(const Expr *E) {
+  if (E->isRValue())
+    return (void) EmitAnyExpr(E, AggValueSlot::ignored(), true);
+
+  // Just emit it as an l-value and drop the result.
+  EmitLValue(E);
+}
+
+/// EmitAnyExpr - Emit code to compute the specified expression which
+/// can have any type.  The result is returned as an RValue struct.
+/// If this is an aggregate expression, AggSlot indicates where the
+/// result should be returned.
+RValue CodeGenFunction::EmitAnyExpr(const Expr *E,
+                                    AggValueSlot aggSlot,
+                                    bool ignoreResult) {
+  switch (getEvaluationKind(E->getType())) {
+  case TEK_Scalar:
+    return RValue::get(EmitScalarExpr(E, ignoreResult));
+  case TEK_Complex:
+    return RValue::getComplex(EmitComplexExpr(E, ignoreResult, ignoreResult));
+  case TEK_Aggregate:
+    if (!ignoreResult && aggSlot.isIgnored())
+      aggSlot = CreateAggTemp(E->getType(), "agg-temp");
+    EmitAggExpr(E, aggSlot);
+    return aggSlot.asRValue();
+  }
+  llvm_unreachable("bad evaluation kind");
+}
+
+/// EmitAnyExprToTemp - Similar to EmitAnyExpr(), however, the result will
+/// always be accessible even if no aggregate location is provided.
+RValue CodeGenFunction::EmitAnyExprToTemp(const Expr *E) {
+  AggValueSlot AggSlot = AggValueSlot::ignored();
+
+  if (hasAggregateEvaluationKind(E->getType()))
+    AggSlot = CreateAggTemp(E->getType(), "agg.tmp");
+  return EmitAnyExpr(E, AggSlot);
+}
+
+/// EmitAnyExprToMem - Evaluate an expression into a given memory
+/// location.
+void CodeGenFunction::EmitAnyExprToMem(const Expr *E,
+                                       Address Location,
+                                       Qualifiers Quals,
+                                       bool IsInit) {
+  // FIXME: This function should take an LValue as an argument.
+  switch (getEvaluationKind(E->getType())) {
+  case TEK_Complex:
+    EmitComplexExprIntoLValue(E, MakeAddrLValue(Location, E->getType()),
+                              /*isInit*/ false);
+    return;
+
+  case TEK_Aggregate: {
+    EmitAggExpr(E, AggValueSlot::forAddr(Location, Quals,
+                                         AggValueSlot::IsDestructed_t(IsInit),
+                                         AggValueSlot::DoesNotNeedGCBarriers,
+                                         AggValueSlot::IsAliased_t(!IsInit),
+                                         AggValueSlot::MayOverlap));
+    return;
+  }
+
+  case TEK_Scalar: {
+    RValue RV = RValue::get(EmitScalarExpr(E, /*Ignore*/ false));
+    LValue LV = MakeAddrLValue(Location, E->getType());
+    EmitStoreThroughLValue(RV, LV);
+    return;
+  }
+  }
+  llvm_unreachable("bad evaluation kind");
+}
+
+static void
+pushTemporaryCleanup(CodeGenFunction &CGF, const MaterializeTemporaryExpr *M,
+                     const Expr *E, Address ReferenceTemporary) {
+  // Objective-C++ ARC:
+  //   If we are binding a reference to a temporary that has ownership, we
+  //   need to perform retain/release operations on the temporary.
+  //
+  // FIXME: This should be looking at E, not M.
+  if (auto Lifetime = M->getType().getObjCLifetime()) {
+    switch (Lifetime) {
+    case Qualifiers::OCL_None:
+    case Qualifiers::OCL_ExplicitNone:
+      // Carry on to normal cleanup handling.
+      break;
+
+    case Qualifiers::OCL_Autoreleasing:
+      // Nothing to do; cleaned up by an autorelease pool.
+      return;
+
+    case Qualifiers::OCL_Strong:
+    case Qualifiers::OCL_Weak:
+      switch (StorageDuration Duration = M->getStorageDuration()) {
+      case SD_Static:
+        // Note: we intentionally do not register a cleanup to release
+        // the object on program termination.
+        return;
+
+      case SD_Thread:
+        // FIXME: We should probably register a cleanup in this case.
+        return;
+
+      case SD_Automatic:
+      case SD_FullExpression:
+        CodeGenFunction::Destroyer *Destroy;
+        CleanupKind CleanupKind;
+        if (Lifetime == Qualifiers::OCL_Strong) {
+          const ValueDecl *VD = M->getExtendingDecl();
+          bool Precise =
+              VD && isa<VarDecl>(VD) && VD->hasAttr<ObjCPreciseLifetimeAttr>();
+          CleanupKind = CGF.getARCCleanupKind();
+          Destroy = Precise ? &CodeGenFunction::destroyARCStrongPrecise
+                            : &CodeGenFunction::destroyARCStrongImprecise;
+        } else {
+          // __weak objects always get EH cleanups; otherwise, exceptions
+          // could cause really nasty crashes instead of mere leaks.
+          CleanupKind = NormalAndEHCleanup;
+          Destroy = &CodeGenFunction::destroyARCWeak;
+        }
+        if (Duration == SD_FullExpression)
+          CGF.pushDestroy(CleanupKind, ReferenceTemporary,
+                          M->getType(), *Destroy,
+                          CleanupKind & EHCleanup);
+        else
+          CGF.pushLifetimeExtendedDestroy(CleanupKind, ReferenceTemporary,
+                                          M->getType(),
+                                          *Destroy, CleanupKind & EHCleanup);
+        return;
+
+      case SD_Dynamic:
+        llvm_unreachable("temporary cannot have dynamic storage duration");
+      }
+      llvm_unreachable("unknown storage duration");
+    }
+  }
+
+  CXXDestructorDecl *ReferenceTemporaryDtor = nullptr;
+  if (const RecordType *RT =
+          E->getType()->getBaseElementTypeUnsafe()->getAs<RecordType>()) {
+    // Get the destructor for the reference temporary.
+    auto *ClassDecl = cast<CXXRecordDecl>(RT->getDecl());
+    if (!ClassDecl->hasTrivialDestructor())
+      ReferenceTemporaryDtor = ClassDecl->getDestructor();
+  }
+
+  if (!ReferenceTemporaryDtor)
+    return;
+
+  // Call the destructor for the temporary.
+  switch (M->getStorageDuration()) {
+  case SD_Static:
+  case SD_Thread: {
+    llvm::FunctionCallee CleanupFn;
+    llvm::Constant *CleanupArg;
+    if (E->getType()->isArrayType()) {
+      CleanupFn = CodeGenFunction(CGF.CGM).generateDestroyHelper(
+          ReferenceTemporary, E->getType(),
+          CodeGenFunction::destroyCXXObject, CGF.getLangOpts().Exceptions,
+          dyn_cast_or_null<VarDecl>(M->getExtendingDecl()));
+      CleanupArg = llvm::Constant::getNullValue(CGF.Int8PtrTy);
+    } else {
+      CleanupFn = CGF.CGM.getAddrAndTypeOfCXXStructor(
+          GlobalDecl(ReferenceTemporaryDtor, Dtor_Complete));
+      CleanupArg = cast<llvm::Constant>(ReferenceTemporary.getPointer());
+    }
+    CGF.CGM.getCXXABI().registerGlobalDtor(
+        CGF, *cast<VarDecl>(M->getExtendingDecl()), CleanupFn, CleanupArg);
+    break;
+  }
+
+  case SD_FullExpression:
+    CGF.pushDestroy(NormalAndEHCleanup, ReferenceTemporary, E->getType(),
+                    CodeGenFunction::destroyCXXObject,
+                    CGF.getLangOpts().Exceptions);
+    break;
+
+  case SD_Automatic:
+    CGF.pushLifetimeExtendedDestroy(NormalAndEHCleanup,
+                                    ReferenceTemporary, E->getType(),
+                                    CodeGenFunction::destroyCXXObject,
+                                    CGF.getLangOpts().Exceptions);
+    break;
+
+  case SD_Dynamic:
+    llvm_unreachable("temporary cannot have dynamic storage duration");
+  }
+}
+
+static Address createReferenceTemporary(CodeGenFunction &CGF,
+                                        const MaterializeTemporaryExpr *M,
+                                        const Expr *Inner,
+                                        Address *Alloca = nullptr) {
+  auto &TCG = CGF.getTargetHooks();
+  switch (M->getStorageDuration()) {
+  case SD_FullExpression:
+  case SD_Automatic: {
+    // If we have a constant temporary array or record try to promote it into a
+    // constant global under the same rules a normal constant would've been
+    // promoted. This is easier on the optimizer and generally emits fewer
+    // instructions.
+    QualType Ty = Inner->getType();
+    if (CGF.CGM.getCodeGenOpts().MergeAllConstants &&
+        (Ty->isArrayType() || Ty->isRecordType()) &&
+        CGF.CGM.isTypeConstant(Ty, true))
+      if (auto Init = ConstantEmitter(CGF).tryEmitAbstract(Inner, Ty)) {
+        if (auto AddrSpace = CGF.getTarget().getConstantAddressSpace()) {
+          auto AS = AddrSpace.getValue();
+          auto *GV = new llvm::GlobalVariable(
+              CGF.CGM.getModule(), Init->getType(), /*isConstant=*/true,
+              llvm::GlobalValue::PrivateLinkage, Init, ".ref.tmp", nullptr,
+              llvm::GlobalValue::NotThreadLocal,
+              CGF.getContext().getTargetAddressSpace(AS));
+          CharUnits alignment = CGF.getContext().getTypeAlignInChars(Ty);
+          GV->setAlignment(alignment.getAsAlign());
+          llvm::Constant *C = GV;
+          if (AS != LangAS::Default)
+            C = TCG.performAddrSpaceCast(
+                CGF.CGM, GV, AS, LangAS::Default,
+                GV->getValueType()->getPointerTo(
+                    CGF.getContext().getTargetAddressSpace(LangAS::Default)));
+          // FIXME: Should we put the new global into a COMDAT?
+          return Address(C, alignment);
+        }
+      }
+    return CGF.CreateMemTemp(Ty, "ref.tmp", Alloca);
+  }
+  case SD_Thread:
+  case SD_Static:
+    return CGF.CGM.GetAddrOfGlobalTemporary(M, Inner);
+
+  case SD_Dynamic:
+    llvm_unreachable("temporary can't have dynamic storage duration");
+  }
+  llvm_unreachable("unknown storage duration");
+}
+
+LValue CodeGenFunction::
+EmitMaterializeTemporaryExpr(const MaterializeTemporaryExpr *M) {
+  const Expr *E = M->getSubExpr();
+
+  assert((!M->getExtendingDecl() || !isa<VarDecl>(M->getExtendingDecl()) ||
+          !cast<VarDecl>(M->getExtendingDecl())->isARCPseudoStrong()) &&
+         "Reference should never be pseudo-strong!");
+
+  // FIXME: ideally this would use EmitAnyExprToMem, however, we cannot do so
+  // as that will cause the lifetime adjustment to be lost for ARC
+  auto ownership = M->getType().getObjCLifetime();
+  if (ownership != Qualifiers::OCL_None &&
+      ownership != Qualifiers::OCL_ExplicitNone) {
+    Address Object = createReferenceTemporary(*this, M, E);
+    if (auto *Var = dyn_cast<llvm::GlobalVariable>(Object.getPointer())) {
+      Object = Address(llvm::ConstantExpr::getBitCast(Var,
+                           ConvertTypeForMem(E->getType())
+                             ->getPointerTo(Object.getAddressSpace())),
+                       Object.getAlignment());
+
+      // createReferenceTemporary will promote the temporary to a global with a
+      // constant initializer if it can.  It can only do this to a value of
+      // ARC-manageable type if the value is global and therefore "immune" to
+      // ref-counting operations.  Therefore we have no need to emit either a
+      // dynamic initialization or a cleanup and we can just return the address
+      // of the temporary.
+      if (Var->hasInitializer())
+        return MakeAddrLValue(Object, M->getType(), AlignmentSource::Decl);
+
+      Var->setInitializer(CGM.EmitNullConstant(E->getType()));
+    }
+    LValue RefTempDst = MakeAddrLValue(Object, M->getType(),
+                                       AlignmentSource::Decl);
+
+    switch (getEvaluationKind(E->getType())) {
+    default: llvm_unreachable("expected scalar or aggregate expression");
+    case TEK_Scalar:
+      EmitScalarInit(E, M->getExtendingDecl(), RefTempDst, false);
+      break;
+    case TEK_Aggregate: {
+      EmitAggExpr(E, AggValueSlot::forAddr(Object,
+                                           E->getType().getQualifiers(),
+                                           AggValueSlot::IsDestructed,
+                                           AggValueSlot::DoesNotNeedGCBarriers,
+                                           AggValueSlot::IsNotAliased,
+                                           AggValueSlot::DoesNotOverlap));
+      break;
+    }
+    }
+
+    pushTemporaryCleanup(*this, M, E, Object);
+    return RefTempDst;
+  }
+
+  SmallVector<const Expr *, 2> CommaLHSs;
+  SmallVector<SubobjectAdjustment, 2> Adjustments;
+  E = E->skipRValueSubobjectAdjustments(CommaLHSs, Adjustments);
+
+  for (const auto &Ignored : CommaLHSs)
+    EmitIgnoredExpr(Ignored);
+
+  if (const auto *opaque = dyn_cast<OpaqueValueExpr>(E)) {
+    if (opaque->getType()->isRecordType()) {
+      assert(Adjustments.empty());
+      return EmitOpaqueValueLValue(opaque);
+    }
+  }
+
+  // Create and initialize the reference temporary.
+  Address Alloca = Address::invalid();
+  Address Object = createReferenceTemporary(*this, M, E, &Alloca);
+  if (auto *Var = dyn_cast<llvm::GlobalVariable>(
+          Object.getPointer()->stripPointerCasts())) {
+    Object = Address(llvm::ConstantExpr::getBitCast(
+                         cast<llvm::Constant>(Object.getPointer()),
+                         ConvertTypeForMem(E->getType())->getPointerTo()),
+                     Object.getAlignment());
+    // If the temporary is a global and has a constant initializer or is a
+    // constant temporary that we promoted to a global, we may have already
+    // initialized it.
+    if (!Var->hasInitializer()) {
+      Var->setInitializer(CGM.EmitNullConstant(E->getType()));
+      EmitAnyExprToMem(E, Object, Qualifiers(), /*IsInit*/true);
+    }
+  } else {
+    switch (M->getStorageDuration()) {
+    case SD_Automatic:
+      if (auto *Size = EmitLifetimeStart(
+              CGM.getDataLayout().getTypeAllocSize(Alloca.getElementType()),
+              Alloca.getPointer())) {
+        pushCleanupAfterFullExpr<CallLifetimeEnd>(NormalEHLifetimeMarker,
+                                                  Alloca, Size);
+      }
+      break;
+
+    case SD_FullExpression: {
+      if (!ShouldEmitLifetimeMarkers)
+        break;
+
+      // Avoid creating a conditional cleanup just to hold an llvm.lifetime.end
+      // marker. Instead, start the lifetime of a conditional temporary earlier
+      // so that it's unconditional. Don't do this with sanitizers which need
+      // more precise lifetime marks.
+      ConditionalEvaluation *OldConditional = nullptr;
+      CGBuilderTy::InsertPoint OldIP;
+      if (isInConditionalBranch() && !E->getType().isDestructedType() &&
+          !SanOpts.has(SanitizerKind::HWAddress) &&
+          !SanOpts.has(SanitizerKind::Memory) &&
+          !CGM.getCodeGenOpts().SanitizeAddressUseAfterScope) {
+        OldConditional = OutermostConditional;
+        OutermostConditional = nullptr;
+
+        OldIP = Builder.saveIP();
+        llvm::BasicBlock *Block = OldConditional->getStartingBlock();
+        Builder.restoreIP(CGBuilderTy::InsertPoint(
+            Block, llvm::BasicBlock::iterator(Block->back())));
+      }
+
+      if (auto *Size = EmitLifetimeStart(
+              CGM.getDataLayout().getTypeAllocSize(Alloca.getElementType()),
+              Alloca.getPointer())) {
+        pushFullExprCleanup<CallLifetimeEnd>(NormalEHLifetimeMarker, Alloca,
+                                             Size);
+      }
+
+      if (OldConditional) {
+        OutermostConditional = OldConditional;
+        Builder.restoreIP(OldIP);
+      }
+      break;
+    }
+
+    default:
+      break;
+    }
+    EmitAnyExprToMem(E, Object, Qualifiers(), /*IsInit*/true);
+  }
+  pushTemporaryCleanup(*this, M, E, Object);
+
+  // Perform derived-to-base casts and/or field accesses, to get from the
+  // temporary object we created (and, potentially, for which we extended
+  // the lifetime) to the subobject we're binding the reference to.
+  for (unsigned I = Adjustments.size(); I != 0; --I) {
+    SubobjectAdjustment &Adjustment = Adjustments[I-1];
+    switch (Adjustment.Kind) {
+    case SubobjectAdjustment::DerivedToBaseAdjustment:
+      Object =
+          GetAddressOfBaseClass(Object, Adjustment.DerivedToBase.DerivedClass,
+                                Adjustment.DerivedToBase.BasePath->path_begin(),
+                                Adjustment.DerivedToBase.BasePath->path_end(),
+                                /*NullCheckValue=*/ false, E->getExprLoc());
+      break;
+
+    case SubobjectAdjustment::FieldAdjustment: {
+      LValue LV = MakeAddrLValue(Object, E->getType(), AlignmentSource::Decl);
+      LV = EmitLValueForField(LV, Adjustment.Field);
+      assert(LV.isSimple() &&
+             "materialized temporary field is not a simple lvalue");
+      Object = LV.getAddress(*this);
+      break;
+    }
+
+    case SubobjectAdjustment::MemberPointerAdjustment: {
+      llvm::Value *Ptr = EmitScalarExpr(Adjustment.Ptr.RHS);
+      Object = EmitCXXMemberDataPointerAddress(E, Object, Ptr,
+                                               Adjustment.Ptr.MPT);
+      break;
+    }
+    }
+  }
+
+  return MakeAddrLValue(Object, M->getType(), AlignmentSource::Decl);
+}
+
+RValue
+CodeGenFunction::EmitReferenceBindingToExpr(const Expr *E) {
+  // Emit the expression as an lvalue.
+  LValue LV = EmitLValue(E);
+  assert(LV.isSimple());
+  llvm::Value *Value = LV.getPointer(*this);
+
+  if (sanitizePerformTypeCheck() && !E->getType()->isFunctionType()) {
+    // C++11 [dcl.ref]p5 (as amended by core issue 453):
+    //   If a glvalue to which a reference is directly bound designates neither
+    //   an existing object or function of an appropriate type nor a region of
+    //   storage of suitable size and alignment to contain an object of the
+    //   reference's type, the behavior is undefined.
+    QualType Ty = E->getType();
+    EmitTypeCheck(TCK_ReferenceBinding, E->getExprLoc(), Value, Ty);
+  }
+
+  return RValue::get(Value);
+}
+
+
+/// getAccessedFieldNo - Given an encoded value and a result number, return the
+/// input field number being accessed.
+unsigned CodeGenFunction::getAccessedFieldNo(unsigned Idx,
+                                             const llvm::Constant *Elts) {
+  return cast<llvm::ConstantInt>(Elts->getAggregateElement(Idx))
+      ->getZExtValue();
+}
+
+/// Emit the hash_16_bytes function from include/llvm/ADT/Hashing.h.
+static llvm::Value *emitHash16Bytes(CGBuilderTy &Builder, llvm::Value *Low,
+                                    llvm::Value *High) {
+  llvm::Value *KMul = Builder.getInt64(0x9ddfea08eb382d69ULL);
+  llvm::Value *K47 = Builder.getInt64(47);
+  llvm::Value *A0 = Builder.CreateMul(Builder.CreateXor(Low, High), KMul);
+  llvm::Value *A1 = Builder.CreateXor(Builder.CreateLShr(A0, K47), A0);
+  llvm::Value *B0 = Builder.CreateMul(Builder.CreateXor(High, A1), KMul);
+  llvm::Value *B1 = Builder.CreateXor(Builder.CreateLShr(B0, K47), B0);
+  return Builder.CreateMul(B1, KMul);
+}
+
+bool CodeGenFunction::isNullPointerAllowed(TypeCheckKind TCK) {
+  return TCK == TCK_DowncastPointer || TCK == TCK_Upcast ||
+         TCK == TCK_UpcastToVirtualBase || TCK == TCK_DynamicOperation;
+}
+
+bool CodeGenFunction::isVptrCheckRequired(TypeCheckKind TCK, QualType Ty) {
+  CXXRecordDecl *RD = Ty->getAsCXXRecordDecl();
+  return (RD && RD->hasDefinition() && RD->isDynamicClass()) &&
+         (TCK == TCK_MemberAccess || TCK == TCK_MemberCall ||
+          TCK == TCK_DowncastPointer || TCK == TCK_DowncastReference ||
+          TCK == TCK_UpcastToVirtualBase || TCK == TCK_DynamicOperation);
+}
+
+bool CodeGenFunction::sanitizePerformTypeCheck() const {
+  return SanOpts.has(SanitizerKind::Null) |
+         SanOpts.has(SanitizerKind::Alignment) |
+         SanOpts.has(SanitizerKind::ObjectSize) |
+         SanOpts.has(SanitizerKind::Vptr);
+}
+
+void CodeGenFunction::EmitTypeCheck(TypeCheckKind TCK, SourceLocation Loc,
+                                    llvm::Value *Ptr, QualType Ty,
+                                    CharUnits Alignment,
+                                    SanitizerSet SkippedChecks,
+                                    llvm::Value *ArraySize) {
+  if (!sanitizePerformTypeCheck())
+    return;
+
+  // Don't check pointers outside the default address space. The null check
+  // isn't correct, the object-size check isn't supported by LLVM, and we can't
+  // communicate the addresses to the runtime handler for the vptr check.
+  if (Ptr->getType()->getPointerAddressSpace())
+    return;
+
+  // Don't check pointers to volatile data. The behavior here is implementation-
+  // defined.
+  if (Ty.isVolatileQualified())
+    return;
+
+  SanitizerScope SanScope(this);
+
+  SmallVector<std::pair<llvm::Value *, SanitizerMask>, 3> Checks;
+  llvm::BasicBlock *Done = nullptr;
+
+  // Quickly determine whether we have a pointer to an alloca. It's possible
+  // to skip null checks, and some alignment checks, for these pointers. This
+  // can reduce compile-time significantly.
+  auto PtrToAlloca = dyn_cast<llvm::AllocaInst>(Ptr->stripPointerCasts());
+
+  llvm::Value *True = llvm::ConstantInt::getTrue(getLLVMContext());
+  llvm::Value *IsNonNull = nullptr;
+  bool IsGuaranteedNonNull =
+      SkippedChecks.has(SanitizerKind::Null) || PtrToAlloca;
+  bool AllowNullPointers = isNullPointerAllowed(TCK);
+  if ((SanOpts.has(SanitizerKind::Null) || AllowNullPointers) &&
+      !IsGuaranteedNonNull) {
+    // The glvalue must not be an empty glvalue.
+    IsNonNull = Builder.CreateIsNotNull(Ptr);
+
+    // The IR builder can constant-fold the null check if the pointer points to
+    // a constant.
+    IsGuaranteedNonNull = IsNonNull == True;
+
+    // Skip the null check if the pointer is known to be non-null.
+    if (!IsGuaranteedNonNull) {
+      if (AllowNullPointers) {
+        // When performing pointer casts, it's OK if the value is null.
+        // Skip the remaining checks in that case.
+        Done = createBasicBlock("null");
+        llvm::BasicBlock *Rest = createBasicBlock("not.null");
+        Builder.CreateCondBr(IsNonNull, Rest, Done);
+        EmitBlock(Rest);
+      } else {
+        Checks.push_back(std::make_pair(IsNonNull, SanitizerKind::Null));
+      }
+    }
+  }
+
+  if (SanOpts.has(SanitizerKind::ObjectSize) &&
+      !SkippedChecks.has(SanitizerKind::ObjectSize) &&
+      !Ty->isIncompleteType()) {
+    uint64_t TySize = getContext().getTypeSizeInChars(Ty).getQuantity();
+    llvm::Value *Size = llvm::ConstantInt::get(IntPtrTy, TySize);
+    if (ArraySize)
+      Size = Builder.CreateMul(Size, ArraySize);
+
+    // Degenerate case: new X[0] does not need an objectsize check.
+    llvm::Constant *ConstantSize = dyn_cast<llvm::Constant>(Size);
+    if (!ConstantSize || !ConstantSize->isNullValue()) {
+      // The glvalue must refer to a large enough storage region.
+      // FIXME: If Address Sanitizer is enabled, insert dynamic instrumentation
+      //        to check this.
+      // FIXME: Get object address space
+      llvm::Type *Tys[2] = { IntPtrTy, Int8PtrTy };
+      llvm::Function *F = CGM.getIntrinsic(llvm::Intrinsic::objectsize, Tys);
+      llvm::Value *Min = Builder.getFalse();
+      llvm::Value *NullIsUnknown = Builder.getFalse();
+      llvm::Value *Dynamic = Builder.getFalse();
+      llvm::Value *CastAddr = Builder.CreateBitCast(Ptr, Int8PtrTy);
+      llvm::Value *LargeEnough = Builder.CreateICmpUGE(
+          Builder.CreateCall(F, {CastAddr, Min, NullIsUnknown, Dynamic}), Size);
+      Checks.push_back(std::make_pair(LargeEnough, SanitizerKind::ObjectSize));
+    }
+  }
+
+  uint64_t AlignVal = 0;
+  llvm::Value *PtrAsInt = nullptr;
+
+  if (SanOpts.has(SanitizerKind::Alignment) &&
+      !SkippedChecks.has(SanitizerKind::Alignment)) {
+    AlignVal = Alignment.getQuantity();
+    if (!Ty->isIncompleteType() && !AlignVal)
+      AlignVal = getContext().getTypeAlignInChars(Ty).getQuantity();
+
+    // The glvalue must be suitably aligned.
+    if (AlignVal > 1 &&
+        (!PtrToAlloca || PtrToAlloca->getAlignment() < AlignVal)) {
+      PtrAsInt = Builder.CreatePtrToInt(Ptr, IntPtrTy);
+      llvm::Value *Align = Builder.CreateAnd(
+          PtrAsInt, llvm::ConstantInt::get(IntPtrTy, AlignVal - 1));
+      llvm::Value *Aligned =
+          Builder.CreateICmpEQ(Align, llvm::ConstantInt::get(IntPtrTy, 0));
+      if (Aligned != True)
+        Checks.push_back(std::make_pair(Aligned, SanitizerKind::Alignment));
+    }
+  }
+
+  if (Checks.size() > 0) {
+    // Make sure we're not losing information. Alignment needs to be a power of
+    // 2
+    assert(!AlignVal || (uint64_t)1 << llvm::Log2_64(AlignVal) == AlignVal);
+    llvm::Constant *StaticData[] = {
+        EmitCheckSourceLocation(Loc), EmitCheckTypeDescriptor(Ty),
+        llvm::ConstantInt::get(Int8Ty, AlignVal ? llvm::Log2_64(AlignVal) : 1),
+        llvm::ConstantInt::get(Int8Ty, TCK)};
+    EmitCheck(Checks, SanitizerHandler::TypeMismatch, StaticData,
+              PtrAsInt ? PtrAsInt : Ptr);
+  }
+
+  // If possible, check that the vptr indicates that there is a subobject of
+  // type Ty at offset zero within this object.
+  //
+  // C++11 [basic.life]p5,6:
+  //   [For storage which does not refer to an object within its lifetime]
+  //   The program has undefined behavior if:
+  //    -- the [pointer or glvalue] is used to access a non-static data member
+  //       or call a non-static member function
+  if (SanOpts.has(SanitizerKind::Vptr) &&
+      !SkippedChecks.has(SanitizerKind::Vptr) && isVptrCheckRequired(TCK, Ty)) {
+    // Ensure that the pointer is non-null before loading it. If there is no
+    // compile-time guarantee, reuse the run-time null check or emit a new one.
+    if (!IsGuaranteedNonNull) {
+      if (!IsNonNull)
+        IsNonNull = Builder.CreateIsNotNull(Ptr);
+      if (!Done)
+        Done = createBasicBlock("vptr.null");
+      llvm::BasicBlock *VptrNotNull = createBasicBlock("vptr.not.null");
+      Builder.CreateCondBr(IsNonNull, VptrNotNull, Done);
+      EmitBlock(VptrNotNull);
+    }
+
+    // Compute a hash of the mangled name of the type.
+    //
+    // FIXME: This is not guaranteed to be deterministic! Move to a
+    //        fingerprinting mechanism once LLVM provides one. For the time
+    //        being the implementation happens to be deterministic.
+    SmallString<64> MangledName;
+    llvm::raw_svector_ostream Out(MangledName);
+    CGM.getCXXABI().getMangleContext().mangleCXXRTTI(Ty.getUnqualifiedType(),
+                                                     Out);
+
+    // Blacklist based on the mangled type.
+    if (!CGM.getContext().getSanitizerBlacklist().isBlacklistedType(
+            SanitizerKind::Vptr, Out.str())) {
+      llvm::hash_code TypeHash = hash_value(Out.str());
+
+      // Load the vptr, and compute hash_16_bytes(TypeHash, vptr).
+      llvm::Value *Low = llvm::ConstantInt::get(Int64Ty, TypeHash);
+      llvm::Type *VPtrTy = llvm::PointerType::get(IntPtrTy, 0);
+      Address VPtrAddr(Builder.CreateBitCast(Ptr, VPtrTy), getPointerAlign());
+      llvm::Value *VPtrVal = Builder.CreateLoad(VPtrAddr);
+      llvm::Value *High = Builder.CreateZExt(VPtrVal, Int64Ty);
+
+      llvm::Value *Hash = emitHash16Bytes(Builder, Low, High);
+      Hash = Builder.CreateTrunc(Hash, IntPtrTy);
+
+      // Look the hash up in our cache.
+      const int CacheSize = 128;
+      llvm::Type *HashTable = llvm::ArrayType::get(IntPtrTy, CacheSize);
+      llvm::Value *Cache = CGM.CreateRuntimeVariable(HashTable,
+                                                     "__ubsan_vptr_type_cache");
+      llvm::Value *Slot = Builder.CreateAnd(Hash,
+                                            llvm::ConstantInt::get(IntPtrTy,
+                                                                   CacheSize-1));
+      llvm::Value *Indices[] = { Builder.getInt32(0), Slot };
+      llvm::Value *CacheVal =
+        Builder.CreateAlignedLoad(Builder.CreateInBoundsGEP(Cache, Indices),
+                                  getPointerAlign());
+
+      // If the hash isn't in the cache, call a runtime handler to perform the
+      // hard work of checking whether the vptr is for an object of the right
+      // type. This will either fill in the cache and return, or produce a
+      // diagnostic.
+      llvm::Value *EqualHash = Builder.CreateICmpEQ(CacheVal, Hash);
+      llvm::Constant *StaticData[] = {
+        EmitCheckSourceLocation(Loc),
+        EmitCheckTypeDescriptor(Ty),
+        CGM.GetAddrOfRTTIDescriptor(Ty.getUnqualifiedType()),
+        llvm::ConstantInt::get(Int8Ty, TCK)
+      };
+      llvm::Value *DynamicData[] = { Ptr, Hash };
+      EmitCheck(std::make_pair(EqualHash, SanitizerKind::Vptr),
+                SanitizerHandler::DynamicTypeCacheMiss, StaticData,
+                DynamicData);
+    }
+  }
+
+  if (Done) {
+    Builder.CreateBr(Done);
+    EmitBlock(Done);
+  }
+}
+
+/// Determine whether this expression refers to a flexible array member in a
+/// struct. We disable array bounds checks for such members.
+static bool isFlexibleArrayMemberExpr(const Expr *E) {
+  // For compatibility with existing code, we treat arrays of length 0 or
+  // 1 as flexible array members.
+  const ArrayType *AT = E->getType()->castAsArrayTypeUnsafe();
+  if (const auto *CAT = dyn_cast<ConstantArrayType>(AT)) {
+    if (CAT->getSize().ugt(1))
+      return false;
+  } else if (!isa<IncompleteArrayType>(AT))
+    return false;
+
+  E = E->IgnoreParens();
+
+  // A flexible array member must be the last member in the class.
+  if (const auto *ME = dyn_cast<MemberExpr>(E)) {
+    // FIXME: If the base type of the member expr is not FD->getParent(),
+    // this should not be treated as a flexible array member access.
+    if (const auto *FD = dyn_cast<FieldDecl>(ME->getMemberDecl())) {
+      RecordDecl::field_iterator FI(
+          DeclContext::decl_iterator(const_cast<FieldDecl *>(FD)));
+      return ++FI == FD->getParent()->field_end();
+    }
+  } else if (const auto *IRE = dyn_cast<ObjCIvarRefExpr>(E)) {
+    return IRE->getDecl()->getNextIvar() == nullptr;
+  }
+
+  return false;
+}
+
+llvm::Value *CodeGenFunction::LoadPassedObjectSize(const Expr *E,
+                                                   QualType EltTy) {
+  ASTContext &C = getContext();
+  uint64_t EltSize = C.getTypeSizeInChars(EltTy).getQuantity();
+  if (!EltSize)
+    return nullptr;
+
+  auto *ArrayDeclRef = dyn_cast<DeclRefExpr>(E->IgnoreParenImpCasts());
+  if (!ArrayDeclRef)
+    return nullptr;
+
+  auto *ParamDecl = dyn_cast<ParmVarDecl>(ArrayDeclRef->getDecl());
+  if (!ParamDecl)
+    return nullptr;
+
+  auto *POSAttr = ParamDecl->getAttr<PassObjectSizeAttr>();
+  if (!POSAttr)
+    return nullptr;
+
+  // Don't load the size if it's a lower bound.
+  int POSType = POSAttr->getType();
+  if (POSType != 0 && POSType != 1)
+    return nullptr;
+
+  // Find the implicit size parameter.
+  auto PassedSizeIt = SizeArguments.find(ParamDecl);
+  if (PassedSizeIt == SizeArguments.end())
+    return nullptr;
+
+  const ImplicitParamDecl *PassedSizeDecl = PassedSizeIt->second;
+  assert(LocalDeclMap.count(PassedSizeDecl) && "Passed size not loadable");
+  Address AddrOfSize = LocalDeclMap.find(PassedSizeDecl)->second;
+  llvm::Value *SizeInBytes = EmitLoadOfScalar(AddrOfSize, /*Volatile=*/false,
+                                              C.getSizeType(), E->getExprLoc());
+  llvm::Value *SizeOfElement =
+      llvm::ConstantInt::get(SizeInBytes->getType(), EltSize);
+  return Builder.CreateUDiv(SizeInBytes, SizeOfElement);
+}
+
+/// If Base is known to point to the start of an array, return the length of
+/// that array. Return 0 if the length cannot be determined.
+static llvm::Value *getArrayIndexingBound(
+    CodeGenFunction &CGF, const Expr *Base, QualType &IndexedType) {
+  // For the vector indexing extension, the bound is the number of elements.
+  if (const VectorType *VT = Base->getType()->getAs<VectorType>()) {
+    IndexedType = Base->getType();
+    return CGF.Builder.getInt32(VT->getNumElements());
+  }
+
+  Base = Base->IgnoreParens();
+
+  if (const auto *CE = dyn_cast<CastExpr>(Base)) {
+    if (CE->getCastKind() == CK_ArrayToPointerDecay &&
+        !isFlexibleArrayMemberExpr(CE->getSubExpr())) {
+      IndexedType = CE->getSubExpr()->getType();
+      const ArrayType *AT = IndexedType->castAsArrayTypeUnsafe();
+      if (const auto *CAT = dyn_cast<ConstantArrayType>(AT))
+        return CGF.Builder.getInt(CAT->getSize());
+      else if (const auto *VAT = dyn_cast<VariableArrayType>(AT))
+        return CGF.getVLASize(VAT).NumElts;
+      // Ignore pass_object_size here. It's not applicable on decayed pointers.
+    }
+  }
+
+  QualType EltTy{Base->getType()->getPointeeOrArrayElementType(), 0};
+  if (llvm::Value *POS = CGF.LoadPassedObjectSize(Base, EltTy)) {
+    IndexedType = Base->getType();
+    return POS;
+  }
+
+  return nullptr;
+}
+
+void CodeGenFunction::EmitBoundsCheck(const Expr *E, const Expr *Base,
+                                      llvm::Value *Index, QualType IndexType,
+                                      bool Accessed) {
+  assert(SanOpts.has(SanitizerKind::ArrayBounds) &&
+         "should not be called unless adding bounds checks");
+  SanitizerScope SanScope(this);
+
+  QualType IndexedType;
+  llvm::Value *Bound = getArrayIndexingBound(*this, Base, IndexedType);
+  if (!Bound)
+    return;
+
+  bool IndexSigned = IndexType->isSignedIntegerOrEnumerationType();
+  llvm::Value *IndexVal = Builder.CreateIntCast(Index, SizeTy, IndexSigned);
+  llvm::Value *BoundVal = Builder.CreateIntCast(Bound, SizeTy, false);
+
+  llvm::Constant *StaticData[] = {
+    EmitCheckSourceLocation(E->getExprLoc()),
+    EmitCheckTypeDescriptor(IndexedType),
+    EmitCheckTypeDescriptor(IndexType)
+  };
+  llvm::Value *Check = Accessed ? Builder.CreateICmpULT(IndexVal, BoundVal)
+                                : Builder.CreateICmpULE(IndexVal, BoundVal);
+  EmitCheck(std::make_pair(Check, SanitizerKind::ArrayBounds),
+            SanitizerHandler::OutOfBounds, StaticData, Index);
+}
+
+
+CodeGenFunction::ComplexPairTy CodeGenFunction::
+EmitComplexPrePostIncDec(const UnaryOperator *E, LValue LV,
+                         bool isInc, bool isPre) {
+  ComplexPairTy InVal = EmitLoadOfComplex(LV, E->getExprLoc());
+
+  llvm::Value *NextVal;
+  if (isa<llvm::IntegerType>(InVal.first->getType())) {
+    uint64_t AmountVal = isInc ? 1 : -1;
+    NextVal = llvm::ConstantInt::get(InVal.first->getType(), AmountVal, true);
+
+    // Add the inc/dec to the real part.
+    NextVal = Builder.CreateAdd(InVal.first, NextVal, isInc ? "inc" : "dec");
+  } else {
+    QualType ElemTy = E->getType()->castAs<ComplexType>()->getElementType();
+    llvm::APFloat FVal(getContext().getFloatTypeSemantics(ElemTy), 1);
+    if (!isInc)
+      FVal.changeSign();
+    NextVal = llvm::ConstantFP::get(getLLVMContext(), FVal);
+
+    // Add the inc/dec to the real part.
+    NextVal = Builder.CreateFAdd(InVal.first, NextVal, isInc ? "inc" : "dec");
+  }
+
+  ComplexPairTy IncVal(NextVal, InVal.second);
+
+  // Store the updated result through the lvalue.
+  EmitStoreOfComplex(IncVal, LV, /*init*/ false);
+  if (getLangOpts().OpenMP)
+    CGM.getOpenMPRuntime().checkAndEmitLastprivateConditional(*this,
+                                                              E->getSubExpr());
+
+  // If this is a postinc, return the value read from memory, otherwise use the
+  // updated value.
+  return isPre ? IncVal : InVal;
+}
+
+void CodeGenModule::EmitExplicitCastExprType(const ExplicitCastExpr *E,
+                                             CodeGenFunction *CGF) {
+  // Bind VLAs in the cast type.
+  if (CGF && E->getType()->isVariablyModifiedType())
+    CGF->EmitVariablyModifiedType(E->getType());
+
+  if (CGDebugInfo *DI = getModuleDebugInfo())
+    DI->EmitExplicitCastType(E->getType());
+}
+
+//===----------------------------------------------------------------------===//
+//                         LValue Expression Emission
+//===----------------------------------------------------------------------===//
+
+/// EmitPointerWithAlignment - Given an expression of pointer type, try to
+/// derive a more accurate bound on the alignment of the pointer.
+Address CodeGenFunction::EmitPointerWithAlignment(const Expr *E,
+                                                  LValueBaseInfo *BaseInfo,
+                                                  TBAAAccessInfo *TBAAInfo) {
+  // We allow this with ObjC object pointers because of fragile ABIs.
+  assert(E->getType()->isPointerType() ||
+         E->getType()->isObjCObjectPointerType());
+  E = E->IgnoreParens();
+
+  // Casts:
+  if (const CastExpr *CE = dyn_cast<CastExpr>(E)) {
+    if (const auto *ECE = dyn_cast<ExplicitCastExpr>(CE))
+      CGM.EmitExplicitCastExprType(ECE, this);
+
+    switch (CE->getCastKind()) {
+    // Non-converting casts (but not C's implicit conversion from void*).
+    case CK_BitCast:
+    case CK_NoOp:
+    case CK_AddressSpaceConversion:
+      if (auto PtrTy = CE->getSubExpr()->getType()->getAs<PointerType>()) {
+        if (PtrTy->getPointeeType()->isVoidType())
+          break;
+
+        LValueBaseInfo InnerBaseInfo;
+        TBAAAccessInfo InnerTBAAInfo;
+        Address Addr = EmitPointerWithAlignment(CE->getSubExpr(),
+                                                &InnerBaseInfo,
+                                                &InnerTBAAInfo);
+        if (BaseInfo) *BaseInfo = InnerBaseInfo;
+        if (TBAAInfo) *TBAAInfo = InnerTBAAInfo;
+
+        if (isa<ExplicitCastExpr>(CE)) {
+          LValueBaseInfo TargetTypeBaseInfo;
+          TBAAAccessInfo TargetTypeTBAAInfo;
+          CharUnits Align = getNaturalPointeeTypeAlignment(E->getType(),
+                                                           &TargetTypeBaseInfo,
+                                                           &TargetTypeTBAAInfo);
+          if (TBAAInfo)
+            *TBAAInfo = CGM.mergeTBAAInfoForCast(*TBAAInfo,
+                                                 TargetTypeTBAAInfo);
+          // If the source l-value is opaque, honor the alignment of the
+          // casted-to type.
+          if (InnerBaseInfo.getAlignmentSource() != AlignmentSource::Decl) {
+            if (BaseInfo)
+              BaseInfo->mergeForCast(TargetTypeBaseInfo);
+            Addr = Address(Addr.getPointer(), Align);
+          }
+        }
+
+        if (SanOpts.has(SanitizerKind::CFIUnrelatedCast) &&
+            CE->getCastKind() == CK_BitCast) {
+          if (auto PT = E->getType()->getAs<PointerType>())
+            EmitVTablePtrCheckForCast(PT->getPointeeType(), Addr.getPointer(),
+                                      /*MayBeNull=*/true,
+                                      CodeGenFunction::CFITCK_UnrelatedCast,
+                                      CE->getBeginLoc());
+        }
+        return CE->getCastKind() != CK_AddressSpaceConversion
+                   ? Builder.CreateBitCast(Addr, ConvertType(E->getType()))
+                   : Builder.CreateAddrSpaceCast(Addr,
+                                                 ConvertType(E->getType()));
+      }
+      break;
+
+    // Array-to-pointer decay.
+    case CK_ArrayToPointerDecay:
+      return EmitArrayToPointerDecay(CE->getSubExpr(), BaseInfo, TBAAInfo);
+
+    // Derived-to-base conversions.
+    case CK_UncheckedDerivedToBase:
+    case CK_DerivedToBase: {
+      // TODO: Support accesses to members of base classes in TBAA. For now, we
+      // conservatively pretend that the complete object is of the base class
+      // type.
+      if (TBAAInfo)
+        *TBAAInfo = CGM.getTBAAAccessInfo(E->getType());
+      Address Addr = EmitPointerWithAlignment(CE->getSubExpr(), BaseInfo);
+      auto Derived = CE->getSubExpr()->getType()->getPointeeCXXRecordDecl();
+      return GetAddressOfBaseClass(Addr, Derived,
+                                   CE->path_begin(), CE->path_end(),
+                                   ShouldNullCheckClassCastValue(CE),
+                                   CE->getExprLoc());
+    }
+
+    // TODO: Is there any reason to treat base-to-derived conversions
+    // specially?
+    default:
+      break;
+    }
+  }
+
+  // Unary &.
+  if (const UnaryOperator *UO = dyn_cast<UnaryOperator>(E)) {
+    if (UO->getOpcode() == UO_AddrOf) {
+      LValue LV = EmitLValue(UO->getSubExpr());
+      if (BaseInfo) *BaseInfo = LV.getBaseInfo();
+      if (TBAAInfo) *TBAAInfo = LV.getTBAAInfo();
+      return LV.getAddress(*this);
+    }
+  }
+
+  // TODO: conditional operators, comma.
+
+  // Otherwise, use the alignment of the type.
+  CharUnits Align = getNaturalPointeeTypeAlignment(E->getType(), BaseInfo,
+                                                   TBAAInfo);
+  return Address(EmitScalarExpr(E), Align);
+}
+
+RValue CodeGenFunction::GetUndefRValue(QualType Ty) {
+  if (Ty->isVoidType())
+    return RValue::get(nullptr);
+
+  switch (getEvaluationKind(Ty)) {
+  case TEK_Complex: {
+    llvm::Type *EltTy =
+      ConvertType(Ty->castAs<ComplexType>()->getElementType());
+    llvm::Value *U = llvm::UndefValue::get(EltTy);
+    return RValue::getComplex(std::make_pair(U, U));
+  }
+
+  // If this is a use of an undefined aggregate type, the aggregate must have an
+  // identifiable address.  Just because the contents of the value are undefined
+  // doesn't mean that the address can't be taken and compared.
+  case TEK_Aggregate: {
+    Address DestPtr = CreateMemTemp(Ty, "undef.agg.tmp");
+    return RValue::getAggregate(DestPtr);
+  }
+
+  case TEK_Scalar:
+    return RValue::get(llvm::UndefValue::get(ConvertType(Ty)));
+  }
+  llvm_unreachable("bad evaluation kind");
+}
+
+RValue CodeGenFunction::EmitUnsupportedRValue(const Expr *E,
+                                              const char *Name) {
+  ErrorUnsupported(E, Name);
+  return GetUndefRValue(E->getType());
+}
+
+LValue CodeGenFunction::EmitUnsupportedLValue(const Expr *E,
+                                              const char *Name) {
+  ErrorUnsupported(E, Name);
+  llvm::Type *Ty = llvm::PointerType::getUnqual(ConvertType(E->getType()));
+  return MakeAddrLValue(Address(llvm::UndefValue::get(Ty), CharUnits::One()),
+                        E->getType());
+}
+
+bool CodeGenFunction::IsWrappedCXXThis(const Expr *Obj) {
+  const Expr *Base = Obj;
+  while (!isa<CXXThisExpr>(Base)) {
+    // The result of a dynamic_cast can be null.
+    if (isa<CXXDynamicCastExpr>(Base))
+      return false;
+
+    if (const auto *CE = dyn_cast<CastExpr>(Base)) {
+      Base = CE->getSubExpr();
+    } else if (const auto *PE = dyn_cast<ParenExpr>(Base)) {
+      Base = PE->getSubExpr();
+    } else if (const auto *UO = dyn_cast<UnaryOperator>(Base)) {
+      if (UO->getOpcode() == UO_Extension)
+        Base = UO->getSubExpr();
+      else
+        return false;
+    } else {
+      return false;
+    }
+  }
+  return true;
+}
+
+LValue CodeGenFunction::EmitCheckedLValue(const Expr *E, TypeCheckKind TCK) {
+  LValue LV;
+  if (SanOpts.has(SanitizerKind::ArrayBounds) && isa<ArraySubscriptExpr>(E))
+    LV = EmitArraySubscriptExpr(cast<ArraySubscriptExpr>(E), /*Accessed*/true);
+  else
+    LV = EmitLValue(E);
+  if (!isa<DeclRefExpr>(E) && !LV.isBitField() && LV.isSimple()) {
+    SanitizerSet SkippedChecks;
+    if (const auto *ME = dyn_cast<MemberExpr>(E)) {
+      bool IsBaseCXXThis = IsWrappedCXXThis(ME->getBase());
+      if (IsBaseCXXThis)
+        SkippedChecks.set(SanitizerKind::Alignment, true);
+      if (IsBaseCXXThis || isa<DeclRefExpr>(ME->getBase()))
+        SkippedChecks.set(SanitizerKind::Null, true);
+    }
+    EmitTypeCheck(TCK, E->getExprLoc(), LV.getPointer(*this), E->getType(),
+                  LV.getAlignment(), SkippedChecks);
+  }
+  return LV;
+}
+
+/// EmitLValue - Emit code to compute a designator that specifies the location
+/// of the expression.
+///
+/// This can return one of two things: a simple address or a bitfield reference.
+/// In either case, the LLVM Value* in the LValue structure is guaranteed to be
+/// an LLVM pointer type.
+///
+/// If this returns a bitfield reference, nothing about the pointee type of the
+/// LLVM value is known: For example, it may not be a pointer to an integer.
+///
+/// If this returns a normal address, and if the lvalue's C type is fixed size,
+/// this method guarantees that the returned pointer type will point to an LLVM
+/// type of the same size of the lvalue's type.  If the lvalue has a variable
+/// length type, this is not possible.
+///
+LValue CodeGenFunction::EmitLValue(const Expr *E) {
+  ApplyDebugLocation DL(*this, E);
+  switch (E->getStmtClass()) {
+  default: return EmitUnsupportedLValue(E, "l-value expression");
+
+  case Expr::ObjCPropertyRefExprClass:
+    llvm_unreachable("cannot emit a property reference directly");
+
+  case Expr::ObjCSelectorExprClass:
+    return EmitObjCSelectorLValue(cast<ObjCSelectorExpr>(E));
+  case Expr::ObjCIsaExprClass:
+    return EmitObjCIsaExpr(cast<ObjCIsaExpr>(E));
+  case Expr::BinaryOperatorClass:
+    return EmitBinaryOperatorLValue(cast<BinaryOperator>(E));
+  case Expr::CompoundAssignOperatorClass: {
+    QualType Ty = E->getType();
+    if (const AtomicType *AT = Ty->getAs<AtomicType>())
+      Ty = AT->getValueType();
+    if (!Ty->isAnyComplexType())
+      return EmitCompoundAssignmentLValue(cast<CompoundAssignOperator>(E));
+    return EmitComplexCompoundAssignmentLValue(cast<CompoundAssignOperator>(E));
+  }
+  case Expr::CallExprClass:
+  case Expr::CXXMemberCallExprClass:
+  case Expr::CXXOperatorCallExprClass:
+  case Expr::UserDefinedLiteralClass:
+    return EmitCallExprLValue(cast<CallExpr>(E));
+  case Expr::CXXRewrittenBinaryOperatorClass:
+    return EmitLValue(cast<CXXRewrittenBinaryOperator>(E)->getSemanticForm());
+  case Expr::VAArgExprClass:
+    return EmitVAArgExprLValue(cast<VAArgExpr>(E));
+  case Expr::DeclRefExprClass:
+    return EmitDeclRefLValue(cast<DeclRefExpr>(E));
+  case Expr::ConstantExprClass:
+    return EmitLValue(cast<ConstantExpr>(E)->getSubExpr());
+  case Expr::ParenExprClass:
+    return EmitLValue(cast<ParenExpr>(E)->getSubExpr());
+  case Expr::GenericSelectionExprClass:
+    return EmitLValue(cast<GenericSelectionExpr>(E)->getResultExpr());
+  case Expr::PredefinedExprClass:
+    return EmitPredefinedLValue(cast<PredefinedExpr>(E));
+  case Expr::StringLiteralClass:
+    return EmitStringLiteralLValue(cast<StringLiteral>(E));
+  case Expr::ObjCEncodeExprClass:
+    return EmitObjCEncodeExprLValue(cast<ObjCEncodeExpr>(E));
+  case Expr::PseudoObjectExprClass:
+    return EmitPseudoObjectLValue(cast<PseudoObjectExpr>(E));
+  case Expr::InitListExprClass:
+    return EmitInitListLValue(cast<InitListExpr>(E));
+  case Expr::CXXTemporaryObjectExprClass:
+  case Expr::CXXConstructExprClass:
+    return EmitCXXConstructLValue(cast<CXXConstructExpr>(E));
+  case Expr::CXXBindTemporaryExprClass:
+    return EmitCXXBindTemporaryLValue(cast<CXXBindTemporaryExpr>(E));
+  case Expr::CXXUuidofExprClass:
+    return EmitCXXUuidofLValue(cast<CXXUuidofExpr>(E));
+  case Expr::LambdaExprClass:
+    return EmitAggExprToLValue(E);
+
+  case Expr::ExprWithCleanupsClass: {
+    const auto *cleanups = cast<ExprWithCleanups>(E);
+    enterFullExpression(cleanups);
+    RunCleanupsScope Scope(*this);
+    LValue LV = EmitLValue(cleanups->getSubExpr());
+    if (LV.isSimple()) {
+      // Defend against branches out of gnu statement expressions surrounded by
+      // cleanups.
+      llvm::Value *V = LV.getPointer(*this);
+      Scope.ForceCleanup({&V});
+      return LValue::MakeAddr(Address(V, LV.getAlignment()), LV.getType(),
+                              getContext(), LV.getBaseInfo(), LV.getTBAAInfo());
+    }
+    // FIXME: Is it possible to create an ExprWithCleanups that produces a
+    // bitfield lvalue or some other non-simple lvalue?
+    return LV;
+  }
+
+  case Expr::CXXDefaultArgExprClass: {
+    auto *DAE = cast<CXXDefaultArgExpr>(E);
+    CXXDefaultArgExprScope Scope(*this, DAE);
+    return EmitLValue(DAE->getExpr());
+  }
+  case Expr::CXXDefaultInitExprClass: {
+    auto *DIE = cast<CXXDefaultInitExpr>(E);
+    CXXDefaultInitExprScope Scope(*this, DIE);
+    return EmitLValue(DIE->getExpr());
+  }
+  case Expr::CXXTypeidExprClass:
+    return EmitCXXTypeidLValue(cast<CXXTypeidExpr>(E));
+
+  case Expr::ObjCMessageExprClass:
+    return EmitObjCMessageExprLValue(cast<ObjCMessageExpr>(E));
+  case Expr::ObjCIvarRefExprClass:
+    return EmitObjCIvarRefLValue(cast<ObjCIvarRefExpr>(E));
+  case Expr::StmtExprClass:
+    return EmitStmtExprLValue(cast<StmtExpr>(E));
+  case Expr::UnaryOperatorClass:
+    return EmitUnaryOpLValue(cast<UnaryOperator>(E));
+  case Expr::ArraySubscriptExprClass:
+    return EmitArraySubscriptExpr(cast<ArraySubscriptExpr>(E));
+  case Expr::OMPArraySectionExprClass:
+    return EmitOMPArraySectionExpr(cast<OMPArraySectionExpr>(E));
+  case Expr::ExtVectorElementExprClass:
+    return EmitExtVectorElementExpr(cast<ExtVectorElementExpr>(E));
+  case Expr::MemberExprClass:
+    return EmitMemberExpr(cast<MemberExpr>(E));
+  case Expr::CompoundLiteralExprClass:
+    return EmitCompoundLiteralLValue(cast<CompoundLiteralExpr>(E));
+  case Expr::ConditionalOperatorClass:
+    return EmitConditionalOperatorLValue(cast<ConditionalOperator>(E));
+  case Expr::BinaryConditionalOperatorClass:
+    return EmitConditionalOperatorLValue(cast<BinaryConditionalOperator>(E));
+  case Expr::ChooseExprClass:
+    return EmitLValue(cast<ChooseExpr>(E)->getChosenSubExpr());
+  case Expr::OpaqueValueExprClass:
+    return EmitOpaqueValueLValue(cast<OpaqueValueExpr>(E));
+  case Expr::SubstNonTypeTemplateParmExprClass:
+    return EmitLValue(cast<SubstNonTypeTemplateParmExpr>(E)->getReplacement());
+  case Expr::ImplicitCastExprClass:
+  case Expr::CStyleCastExprClass:
+  case Expr::CXXFunctionalCastExprClass:
+  case Expr::CXXStaticCastExprClass:
+  case Expr::CXXDynamicCastExprClass:
+  case Expr::CXXReinterpretCastExprClass:
+  case Expr::CXXConstCastExprClass:
+  case Expr::ObjCBridgedCastExprClass:
+    return EmitCastLValue(cast<CastExpr>(E));
+
+  case Expr::MaterializeTemporaryExprClass:
+    return EmitMaterializeTemporaryExpr(cast<MaterializeTemporaryExpr>(E));
+
+  case Expr::CoawaitExprClass:
+    return EmitCoawaitLValue(cast<CoawaitExpr>(E));
+  case Expr::CoyieldExprClass:
+    return EmitCoyieldLValue(cast<CoyieldExpr>(E));
+  }
+}
+
+/// Given an object of the given canonical type, can we safely copy a
+/// value out of it based on its initializer?
+static bool isConstantEmittableObjectType(QualType type) {
+  assert(type.isCanonical());
+  assert(!type->isReferenceType());
+
+  // Must be const-qualified but non-volatile.
+  Qualifiers qs = type.getLocalQualifiers();
+  if (!qs.hasConst() || qs.hasVolatile()) return false;
+
+  // Otherwise, all object types satisfy this except C++ classes with
+  // mutable subobjects or non-trivial copy/destroy behavior.
+  if (const auto *RT = dyn_cast<RecordType>(type))
+    if (const auto *RD = dyn_cast<CXXRecordDecl>(RT->getDecl()))
+      if (RD->hasMutableFields() || !RD->isTrivial())
+        return false;
+
+  return true;
+}
+
+/// Can we constant-emit a load of a reference to a variable of the
+/// given type?  This is different from predicates like
+/// Decl::mightBeUsableInConstantExpressions because we do want it to apply
+/// in situations that don't necessarily satisfy the language's rules
+/// for this (e.g. C++'s ODR-use rules).  For example, we want to able
+/// to do this with const float variables even if those variables
+/// aren't marked 'constexpr'.
+enum ConstantEmissionKind {
+  CEK_None,
+  CEK_AsReferenceOnly,
+  CEK_AsValueOrReference,
+  CEK_AsValueOnly
+};
+static ConstantEmissionKind checkVarTypeForConstantEmission(QualType type) {
+  type = type.getCanonicalType();
+  if (const auto *ref = dyn_cast<ReferenceType>(type)) {
+    if (isConstantEmittableObjectType(ref->getPointeeType()))
+      return CEK_AsValueOrReference;
+    return CEK_AsReferenceOnly;
+  }
+  if (isConstantEmittableObjectType(type))
+    return CEK_AsValueOnly;
+  return CEK_None;
+}
+
+/// Try to emit a reference to the given value without producing it as
+/// an l-value.  This is just an optimization, but it avoids us needing
+/// to emit global copies of variables if they're named without triggering
+/// a formal use in a context where we can't emit a direct reference to them,
+/// for instance if a block or lambda or a member of a local class uses a
+/// const int variable or constexpr variable from an enclosing function.
+CodeGenFunction::ConstantEmission
+CodeGenFunction::tryEmitAsConstant(DeclRefExpr *refExpr) {
+  ValueDecl *value = refExpr->getDecl();
+
+  // The value needs to be an enum constant or a constant variable.
+  ConstantEmissionKind CEK;
+  if (isa<ParmVarDecl>(value)) {
+    CEK = CEK_None;
+  } else if (auto *var = dyn_cast<VarDecl>(value)) {
+    CEK = checkVarTypeForConstantEmission(var->getType());
+  } else if (isa<EnumConstantDecl>(value)) {
+    CEK = CEK_AsValueOnly;
+  } else {
+    CEK = CEK_None;
+  }
+  if (CEK == CEK_None) return ConstantEmission();
+
+  Expr::EvalResult result;
+  bool resultIsReference;
+  QualType resultType;
+
+  // It's best to evaluate all the way as an r-value if that's permitted.
+  if (CEK != CEK_AsReferenceOnly &&
+      refExpr->EvaluateAsRValue(result, getContext())) {
+    resultIsReference = false;
+    resultType = refExpr->getType();
+
+  // Otherwise, try to evaluate as an l-value.
+  } else if (CEK != CEK_AsValueOnly &&
+             refExpr->EvaluateAsLValue(result, getContext())) {
+    resultIsReference = true;
+    resultType = value->getType();
+
+  // Failure.
+  } else {
+    return ConstantEmission();
+  }
+
+  // In any case, if the initializer has side-effects, abandon ship.
+  if (result.HasSideEffects)
+    return ConstantEmission();
+
+  // Emit as a constant.
+  auto C = ConstantEmitter(*this).emitAbstract(refExpr->getLocation(),
+                                               result.Val, resultType);
+
+  // Make sure we emit a debug reference to the global variable.
+  // This should probably fire even for
+  if (isa<VarDecl>(value)) {
+    if (!getContext().DeclMustBeEmitted(cast<VarDecl>(value)))
+      EmitDeclRefExprDbgValue(refExpr, result.Val);
+  } else {
+    assert(isa<EnumConstantDecl>(value));
+    EmitDeclRefExprDbgValue(refExpr, result.Val);
+  }
+
+  // If we emitted a reference constant, we need to dereference that.
+  if (resultIsReference)
+    return ConstantEmission::forReference(C);
+
+  return ConstantEmission::forValue(C);
+}
+
+static DeclRefExpr *tryToConvertMemberExprToDeclRefExpr(CodeGenFunction &CGF,
+                                                        const MemberExpr *ME) {
+  if (auto *VD = dyn_cast<VarDecl>(ME->getMemberDecl())) {
+    // Try to emit static variable member expressions as DREs.
+    return DeclRefExpr::Create(
+        CGF.getContext(), NestedNameSpecifierLoc(), SourceLocation(), VD,
+        /*RefersToEnclosingVariableOrCapture=*/false, ME->getExprLoc(),
+        ME->getType(), ME->getValueKind(), nullptr, nullptr, ME->isNonOdrUse());
+  }
+  return nullptr;
+}
+
+CodeGenFunction::ConstantEmission
+CodeGenFunction::tryEmitAsConstant(const MemberExpr *ME) {
+  if (DeclRefExpr *DRE = tryToConvertMemberExprToDeclRefExpr(*this, ME))
+    return tryEmitAsConstant(DRE);
+  return ConstantEmission();
+}
+
+llvm::Value *CodeGenFunction::emitScalarConstant(
+    const CodeGenFunction::ConstantEmission &Constant, Expr *E) {
+  assert(Constant && "not a constant");
+  if (Constant.isReference())
+    return EmitLoadOfLValue(Constant.getReferenceLValue(*this, E),
+                            E->getExprLoc())
+        .getScalarVal();
+  return Constant.getValue();
+}
+
+llvm::Value *CodeGenFunction::EmitLoadOfScalar(LValue lvalue,
+                                               SourceLocation Loc) {
+  return EmitLoadOfScalar(lvalue.getAddress(*this), lvalue.isVolatile(),
+                          lvalue.getType(), Loc, lvalue.getBaseInfo(),
+                          lvalue.getTBAAInfo(), lvalue.isNontemporal());
+}
+
+static bool hasBooleanRepresentation(QualType Ty) {
+  if (Ty->isBooleanType())
+    return true;
+
+  if (const EnumType *ET = Ty->getAs<EnumType>())
+    return ET->getDecl()->getIntegerType()->isBooleanType();
+
+  if (const AtomicType *AT = Ty->getAs<AtomicType>())
+    return hasBooleanRepresentation(AT->getValueType());
+
+  return false;
+}
+
+static bool getRangeForType(CodeGenFunction &CGF, QualType Ty,
+                            llvm::APInt &Min, llvm::APInt &End,
+                            bool StrictEnums, bool IsBool) {
+  const EnumType *ET = Ty->getAs<EnumType>();
+  bool IsRegularCPlusPlusEnum = CGF.getLangOpts().CPlusPlus && StrictEnums &&
+                                ET && !ET->getDecl()->isFixed();
+  if (!IsBool && !IsRegularCPlusPlusEnum)
+    return false;
+
+  if (IsBool) {
+    Min = llvm::APInt(CGF.getContext().getTypeSize(Ty), 0);
+    End = llvm::APInt(CGF.getContext().getTypeSize(Ty), 2);
+  } else {
+    const EnumDecl *ED = ET->getDecl();
+    llvm::Type *LTy = CGF.ConvertTypeForMem(ED->getIntegerType());
+    unsigned Bitwidth = LTy->getScalarSizeInBits();
+    unsigned NumNegativeBits = ED->getNumNegativeBits();
+    unsigned NumPositiveBits = ED->getNumPositiveBits();
+
+    if (NumNegativeBits) {
+      unsigned NumBits = std::max(NumNegativeBits, NumPositiveBits + 1);
+      assert(NumBits <= Bitwidth);
+      End = llvm::APInt(Bitwidth, 1) << (NumBits - 1);
+      Min = -End;
+    } else {
+      assert(NumPositiveBits <= Bitwidth);
+      End = llvm::APInt(Bitwidth, 1) << NumPositiveBits;
+      Min = llvm::APInt(Bitwidth, 0);
+    }
+  }
+  return true;
+}
+
+llvm::MDNode *CodeGenFunction::getRangeForLoadFromType(QualType Ty) {
+  llvm::APInt Min, End;
+  if (!getRangeForType(*this, Ty, Min, End, CGM.getCodeGenOpts().StrictEnums,
+                       hasBooleanRepresentation(Ty)))
+    return nullptr;
+
+  llvm::MDBuilder MDHelper(getLLVMContext());
+  return MDHelper.createRange(Min, End);
+}
+
+bool CodeGenFunction::EmitScalarRangeCheck(llvm::Value *Value, QualType Ty,
+                                           SourceLocation Loc) {
+  bool HasBoolCheck = SanOpts.has(SanitizerKind::Bool);
+  bool HasEnumCheck = SanOpts.has(SanitizerKind::Enum);
+  if (!HasBoolCheck && !HasEnumCheck)
+    return false;
+
+  bool IsBool = hasBooleanRepresentation(Ty) ||
+                NSAPI(CGM.getContext()).isObjCBOOLType(Ty);
+  bool NeedsBoolCheck = HasBoolCheck && IsBool;
+  bool NeedsEnumCheck = HasEnumCheck && Ty->getAs<EnumType>();
+  if (!NeedsBoolCheck && !NeedsEnumCheck)
+    return false;
+
+  // Single-bit booleans don't need to be checked. Special-case this to avoid
+  // a bit width mismatch when handling bitfield values. This is handled by
+  // EmitFromMemory for the non-bitfield case.
+  if (IsBool &&
+      cast<llvm::IntegerType>(Value->getType())->getBitWidth() == 1)
+    return false;
+
+  llvm::APInt Min, End;
+  if (!getRangeForType(*this, Ty, Min, End, /*StrictEnums=*/true, IsBool))
+    return true;
+
+  auto &Ctx = getLLVMContext();
+  SanitizerScope SanScope(this);
+  llvm::Value *Check;
+  --End;
+  if (!Min) {
+    Check = Builder.CreateICmpULE(Value, llvm::ConstantInt::get(Ctx, End));
+  } else {
+    llvm::Value *Upper =
+        Builder.CreateICmpSLE(Value, llvm::ConstantInt::get(Ctx, End));
+    llvm::Value *Lower =
+        Builder.CreateICmpSGE(Value, llvm::ConstantInt::get(Ctx, Min));
+    Check = Builder.CreateAnd(Upper, Lower);
+  }
+  llvm::Constant *StaticArgs[] = {EmitCheckSourceLocation(Loc),
+                                  EmitCheckTypeDescriptor(Ty)};
+  SanitizerMask Kind =
+      NeedsEnumCheck ? SanitizerKind::Enum : SanitizerKind::Bool;
+  EmitCheck(std::make_pair(Check, Kind), SanitizerHandler::LoadInvalidValue,
+            StaticArgs, EmitCheckValue(Value));
+  return true;
+}
+
+llvm::Value *CodeGenFunction::EmitLoadOfScalar(Address Addr, bool Volatile,
+                                               QualType Ty,
+                                               SourceLocation Loc,
+                                               LValueBaseInfo BaseInfo,
+                                               TBAAAccessInfo TBAAInfo,
+                                               bool isNontemporal) {
+  if (!CGM.getCodeGenOpts().PreserveVec3Type) {
+    // For better performance, handle vector loads differently.
+    if (Ty->isVectorType()) {
+      const llvm::Type *EltTy = Addr.getElementType();
+
+      const auto *VTy = cast<llvm::VectorType>(EltTy);
+
+      // Handle vectors of size 3 like size 4 for better performance.
+      if (VTy->getNumElements() == 3) {
+
+        // Bitcast to vec4 type.
+        llvm::VectorType *vec4Ty =
+            llvm::VectorType::get(VTy->getElementType(), 4);
+        Address Cast = Builder.CreateElementBitCast(Addr, vec4Ty, "castToVec4");
+        // Now load value.
+        llvm::Value *V = Builder.CreateLoad(Cast, Volatile, "loadVec4");
+
+        // Shuffle vector to get vec3.
+        V = Builder.CreateShuffleVector(V, llvm::UndefValue::get(vec4Ty),
+                                        {0, 1, 2}, "extractVec");
+        return EmitFromMemory(V, Ty);
+      }
+    }
+  }
+
+  // Atomic operations have to be done on integral types.
+  LValue AtomicLValue =
+      LValue::MakeAddr(Addr, Ty, getContext(), BaseInfo, TBAAInfo);
+  if (Ty->isAtomicType() || LValueIsSuitableForInlineAtomic(AtomicLValue)) {
+    return EmitAtomicLoad(AtomicLValue, Loc).getScalarVal();
+  }
+
+  llvm::LoadInst *Load = Builder.CreateLoad(Addr, Volatile);
+  if (isNontemporal) {
+    llvm::MDNode *Node = llvm::MDNode::get(
+        Load->getContext(), llvm::ConstantAsMetadata::get(Builder.getInt32(1)));
+    Load->setMetadata(CGM.getModule().getMDKindID("nontemporal"), Node);
+  }
+
+  CGM.DecorateInstructionWithTBAA(Load, TBAAInfo);
+
+  if (EmitScalarRangeCheck(Load, Ty, Loc)) {
+    // In order to prevent the optimizer from throwing away the check, don't
+    // attach range metadata to the load.
+  } else if (CGM.getCodeGenOpts().OptimizationLevel > 0)
+    if (llvm::MDNode *RangeInfo = getRangeForLoadFromType(Ty))
+      Load->setMetadata(llvm::LLVMContext::MD_range, RangeInfo);
+
+  return EmitFromMemory(Load, Ty);
+}
+
+llvm::Value *CodeGenFunction::EmitToMemory(llvm::Value *Value, QualType Ty) {
+  // Bool has a different representation in memory than in registers.
+  if (hasBooleanRepresentation(Ty)) {
+    // This should really always be an i1, but sometimes it's already
+    // an i8, and it's awkward to track those cases down.
+    if (Value->getType()->isIntegerTy(1))
+      return Builder.CreateZExt(Value, ConvertTypeForMem(Ty), "frombool");
+    assert(Value->getType()->isIntegerTy(getContext().getTypeSize(Ty)) &&
+           "wrong value rep of bool");
+  }
+
+  return Value;
+}
+
+llvm::Value *CodeGenFunction::EmitFromMemory(llvm::Value *Value, QualType Ty) {
+  // Bool has a different representation in memory than in registers.
+  if (hasBooleanRepresentation(Ty)) {
+    assert(Value->getType()->isIntegerTy(getContext().getTypeSize(Ty)) &&
+           "wrong value rep of bool");
+    return Builder.CreateTrunc(Value, Builder.getInt1Ty(), "tobool");
+  }
+
+  return Value;
+}
+
+void CodeGenFunction::EmitStoreOfScalar(llvm::Value *Value, Address Addr,
+                                        bool Volatile, QualType Ty,
+                                        LValueBaseInfo BaseInfo,
+                                        TBAAAccessInfo TBAAInfo,
+                                        bool isInit, bool isNontemporal) {
+  if (!CGM.getCodeGenOpts().PreserveVec3Type) {
+    // Handle vectors differently to get better performance.
+    if (Ty->isVectorType()) {
+      llvm::Type *SrcTy = Value->getType();
+      auto *VecTy = dyn_cast<llvm::VectorType>(SrcTy);
+      // Handle vec3 special.
+      if (VecTy && VecTy->getNumElements() == 3) {
+        // Our source is a vec3, do a shuffle vector to make it a vec4.
+        llvm::Constant *Mask[] = {Builder.getInt32(0), Builder.getInt32(1),
+                                  Builder.getInt32(2),
+                                  llvm::UndefValue::get(Builder.getInt32Ty())};
+        llvm::Value *MaskV = llvm::ConstantVector::get(Mask);
+        Value = Builder.CreateShuffleVector(Value, llvm::UndefValue::get(VecTy),
+                                            MaskV, "extractVec");
+        SrcTy = llvm::VectorType::get(VecTy->getElementType(), 4);
+      }
+      if (Addr.getElementType() != SrcTy) {
+        Addr = Builder.CreateElementBitCast(Addr, SrcTy, "storetmp");
+      }
+    }
+  }
+
+  Value = EmitToMemory(Value, Ty);
+
+  LValue AtomicLValue =
+      LValue::MakeAddr(Addr, Ty, getContext(), BaseInfo, TBAAInfo);
+  if (Ty->isAtomicType() ||
+      (!isInit && LValueIsSuitableForInlineAtomic(AtomicLValue))) {
+    EmitAtomicStore(RValue::get(Value), AtomicLValue, isInit);
+    return;
+  }
+
+  llvm::StoreInst *Store = Builder.CreateStore(Value, Addr, Volatile);
+  if (isNontemporal) {
+    llvm::MDNode *Node =
+        llvm::MDNode::get(Store->getContext(),
+                          llvm::ConstantAsMetadata::get(Builder.getInt32(1)));
+    Store->setMetadata(CGM.getModule().getMDKindID("nontemporal"), Node);
+  }
+
+  CGM.DecorateInstructionWithTBAA(Store, TBAAInfo);
+}
+
+void CodeGenFunction::EmitStoreOfScalar(llvm::Value *value, LValue lvalue,
+                                        bool isInit) {
+  EmitStoreOfScalar(value, lvalue.getAddress(*this), lvalue.isVolatile(),
+                    lvalue.getType(), lvalue.getBaseInfo(),
+                    lvalue.getTBAAInfo(), isInit, lvalue.isNontemporal());
+}
+
+/// EmitLoadOfLValue - Given an expression that represents a value lvalue, this
+/// method emits the address of the lvalue, then loads the result as an rvalue,
+/// returning the rvalue.
+RValue CodeGenFunction::EmitLoadOfLValue(LValue LV, SourceLocation Loc) {
+  if (LV.isObjCWeak()) {
+    // load of a __weak object.
+    Address AddrWeakObj = LV.getAddress(*this);
+    return RValue::get(CGM.getObjCRuntime().EmitObjCWeakRead(*this,
+                                                             AddrWeakObj));
+  }
+  if (LV.getQuals().getObjCLifetime() == Qualifiers::OCL_Weak) {
+    // In MRC mode, we do a load+autorelease.
+    if (!getLangOpts().ObjCAutoRefCount) {
+      return RValue::get(EmitARCLoadWeak(LV.getAddress(*this)));
+    }
+
+    // In ARC mode, we load retained and then consume the value.
+    llvm::Value *Object = EmitARCLoadWeakRetained(LV.getAddress(*this));
+    Object = EmitObjCConsumeObject(LV.getType(), Object);
+    return RValue::get(Object);
+  }
+
+  if (LV.isSimple()) {
+    assert(!LV.getType()->isFunctionType());
+
+    // Everything needs a load.
+    return RValue::get(EmitLoadOfScalar(LV, Loc));
+  }
+
+  if (LV.isVectorElt()) {
+    llvm::LoadInst *Load = Builder.CreateLoad(LV.getVectorAddress(),
+                                              LV.isVolatileQualified());
+    return RValue::get(Builder.CreateExtractElement(Load, LV.getVectorIdx(),
+                                                    "vecext"));
+  }
+
+  // If this is a reference to a subset of the elements of a vector, either
+  // shuffle the input or extract/insert them as appropriate.
+  if (LV.isExtVectorElt())
+    return EmitLoadOfExtVectorElementLValue(LV);
+
+  // Global Register variables always invoke intrinsics
+  if (LV.isGlobalReg())
+    return EmitLoadOfGlobalRegLValue(LV);
+
+  assert(LV.isBitField() && "Unknown LValue type!");
+  return EmitLoadOfBitfieldLValue(LV, Loc);
+}
+
+RValue CodeGenFunction::EmitLoadOfBitfieldLValue(LValue LV,
+                                                 SourceLocation Loc) {
+  const CGBitFieldInfo &Info = LV.getBitFieldInfo();
+
+  // Get the output type.
+  llvm::Type *ResLTy = ConvertType(LV.getType());
+
+  Address Ptr = LV.getBitFieldAddress();
+  llvm::Value *Val = Builder.CreateLoad(Ptr, LV.isVolatileQualified(), "bf.load");
+
+  if (Info.IsSigned) {
+    assert(static_cast<unsigned>(Info.Offset + Info.Size) <= Info.StorageSize);
+    unsigned HighBits = Info.StorageSize - Info.Offset - Info.Size;
+    if (HighBits)
+      Val = Builder.CreateShl(Val, HighBits, "bf.shl");
+    if (Info.Offset + HighBits)
+      Val = Builder.CreateAShr(Val, Info.Offset + HighBits, "bf.ashr");
+  } else {
+    if (Info.Offset)
+      Val = Builder.CreateLShr(Val, Info.Offset, "bf.lshr");
+    if (static_cast<unsigned>(Info.Offset) + Info.Size < Info.StorageSize)
+      Val = Builder.CreateAnd(Val, llvm::APInt::getLowBitsSet(Info.StorageSize,
+                                                              Info.Size),
+                              "bf.clear");
+  }
+  Val = Builder.CreateIntCast(Val, ResLTy, Info.IsSigned, "bf.cast");
+  EmitScalarRangeCheck(Val, LV.getType(), Loc);
+  return RValue::get(Val);
+}
+
+// If this is a reference to a subset of the elements of a vector, create an
+// appropriate shufflevector.
+RValue CodeGenFunction::EmitLoadOfExtVectorElementLValue(LValue LV) {
+  llvm::Value *Vec = Builder.CreateLoad(LV.getExtVectorAddress(),
+                                        LV.isVolatileQualified());
+
+  const llvm::Constant *Elts = LV.getExtVectorElts();
+
+  // If the result of the expression is a non-vector type, we must be extracting
+  // a single element.  Just codegen as an extractelement.
+  const VectorType *ExprVT = LV.getType()->getAs<VectorType>();
+  if (!ExprVT) {
+    unsigned InIdx = getAccessedFieldNo(0, Elts);
+    llvm::Value *Elt = llvm::ConstantInt::get(SizeTy, InIdx);
+    return RValue::get(Builder.CreateExtractElement(Vec, Elt));
+  }
+
+  // Always use shuffle vector to try to retain the original program structure
+  unsigned NumResultElts = ExprVT->getNumElements();
+
+  SmallVector<llvm::Constant*, 4> Mask;
+  for (unsigned i = 0; i != NumResultElts; ++i)
+    Mask.push_back(Builder.getInt32(getAccessedFieldNo(i, Elts)));
+
+  llvm::Value *MaskV = llvm::ConstantVector::get(Mask);
+  Vec = Builder.CreateShuffleVector(Vec, llvm::UndefValue::get(Vec->getType()),
+                                    MaskV);
+  return RValue::get(Vec);
+}
+
+/// Generates lvalue for partial ext_vector access.
+Address CodeGenFunction::EmitExtVectorElementLValue(LValue LV) {
+  Address VectorAddress = LV.getExtVectorAddress();
+  QualType EQT = LV.getType()->castAs<VectorType>()->getElementType();
+  llvm::Type *VectorElementTy = CGM.getTypes().ConvertType(EQT);
+
+  Address CastToPointerElement =
+    Builder.CreateElementBitCast(VectorAddress, VectorElementTy,
+                                 "conv.ptr.element");
+
+  const llvm::Constant *Elts = LV.getExtVectorElts();
+  unsigned ix = getAccessedFieldNo(0, Elts);
+
+  Address VectorBasePtrPlusIx =
+    Builder.CreateConstInBoundsGEP(CastToPointerElement, ix,
+                                   "vector.elt");
+
+  return VectorBasePtrPlusIx;
+}
+
+/// Load of global gamed gegisters are always calls to intrinsics.
+RValue CodeGenFunction::EmitLoadOfGlobalRegLValue(LValue LV) {
+  assert((LV.getType()->isIntegerType() || LV.getType()->isPointerType()) &&
+         "Bad type for register variable");
+  llvm::MDNode *RegName = cast<llvm::MDNode>(
+      cast<llvm::MetadataAsValue>(LV.getGlobalReg())->getMetadata());
+
+  // We accept integer and pointer types only
+  llvm::Type *OrigTy = CGM.getTypes().ConvertType(LV.getType());
+  llvm::Type *Ty = OrigTy;
+  if (OrigTy->isPointerTy())
+    Ty = CGM.getTypes().getDataLayout().getIntPtrType(OrigTy);
+  llvm::Type *Types[] = { Ty };
+
+  llvm::Function *F = CGM.getIntrinsic(llvm::Intrinsic::read_register, Types);
+  llvm::Value *Call = Builder.CreateCall(
+      F, llvm::MetadataAsValue::get(Ty->getContext(), RegName));
+  if (OrigTy->isPointerTy())
+    Call = Builder.CreateIntToPtr(Call, OrigTy);
+  return RValue::get(Call);
+}
+
+
+/// EmitStoreThroughLValue - Store the specified rvalue into the specified
+/// lvalue, where both are guaranteed to the have the same type, and that type
+/// is 'Ty'.
+void CodeGenFunction::EmitStoreThroughLValue(RValue Src, LValue Dst,
+                                             bool isInit) {
+  if (!Dst.isSimple()) {
+    if (Dst.isVectorElt()) {
+      // Read/modify/write the vector, inserting the new element.
+      llvm::Value *Vec = Builder.CreateLoad(Dst.getVectorAddress(),
+                                            Dst.isVolatileQualified());
+      Vec = Builder.CreateInsertElement(Vec, Src.getScalarVal(),
+                                        Dst.getVectorIdx(), "vecins");
+      Builder.CreateStore(Vec, Dst.getVectorAddress(),
+                          Dst.isVolatileQualified());
+      return;
+    }
+
+    // If this is an update of extended vector elements, insert them as
+    // appropriate.
+    if (Dst.isExtVectorElt())
+      return EmitStoreThroughExtVectorComponentLValue(Src, Dst);
+
+    if (Dst.isGlobalReg())
+      return EmitStoreThroughGlobalRegLValue(Src, Dst);
+
+    assert(Dst.isBitField() && "Unknown LValue type");
+    return EmitStoreThroughBitfieldLValue(Src, Dst);
+  }
+
+  // There's special magic for assigning into an ARC-qualified l-value.
+  if (Qualifiers::ObjCLifetime Lifetime = Dst.getQuals().getObjCLifetime()) {
+    switch (Lifetime) {
+    case Qualifiers::OCL_None:
+      llvm_unreachable("present but none");
+
+    case Qualifiers::OCL_ExplicitNone:
+      // nothing special
+      break;
+
+    case Qualifiers::OCL_Strong:
+      if (isInit) {
+        Src = RValue::get(EmitARCRetain(Dst.getType(), Src.getScalarVal()));
+        break;
+      }
+      EmitARCStoreStrong(Dst, Src.getScalarVal(), /*ignore*/ true);
+      return;
+
+    case Qualifiers::OCL_Weak:
+      if (isInit)
+        // Initialize and then skip the primitive store.
+        EmitARCInitWeak(Dst.getAddress(*this), Src.getScalarVal());
+      else
+        EmitARCStoreWeak(Dst.getAddress(*this), Src.getScalarVal(),
+                         /*ignore*/ true);
+      return;
+
+    case Qualifiers::OCL_Autoreleasing:
+      Src = RValue::get(EmitObjCExtendObjectLifetime(Dst.getType(),
+                                                     Src.getScalarVal()));
+      // fall into the normal path
+      break;
+    }
+  }
+
+  if (Dst.isObjCWeak() && !Dst.isNonGC()) {
+    // load of a __weak object.
+    Address LvalueDst = Dst.getAddress(*this);
+    llvm::Value *src = Src.getScalarVal();
+     CGM.getObjCRuntime().EmitObjCWeakAssign(*this, src, LvalueDst);
+    return;
+  }
+
+  if (Dst.isObjCStrong() && !Dst.isNonGC()) {
+    // load of a __strong object.
+    Address LvalueDst = Dst.getAddress(*this);
+    llvm::Value *src = Src.getScalarVal();
+    if (Dst.isObjCIvar()) {
+      assert(Dst.getBaseIvarExp() && "BaseIvarExp is NULL");
+      llvm::Type *ResultType = IntPtrTy;
+      Address dst = EmitPointerWithAlignment(Dst.getBaseIvarExp());
+      llvm::Value *RHS = dst.getPointer();
+      RHS = Builder.CreatePtrToInt(RHS, ResultType, "sub.ptr.rhs.cast");
+      llvm::Value *LHS =
+        Builder.CreatePtrToInt(LvalueDst.getPointer(), ResultType,
+                               "sub.ptr.lhs.cast");
+      llvm::Value *BytesBetween = Builder.CreateSub(LHS, RHS, "ivar.offset");
+      CGM.getObjCRuntime().EmitObjCIvarAssign(*this, src, dst,
+                                              BytesBetween);
+    } else if (Dst.isGlobalObjCRef()) {
+      CGM.getObjCRuntime().EmitObjCGlobalAssign(*this, src, LvalueDst,
+                                                Dst.isThreadLocalRef());
+    }
+    else
+      CGM.getObjCRuntime().EmitObjCStrongCastAssign(*this, src, LvalueDst);
+    return;
+  }
+
+  assert(Src.isScalar() && "Can't emit an agg store with this method");
+  EmitStoreOfScalar(Src.getScalarVal(), Dst, isInit);
+}
+
+void CodeGenFunction::EmitStoreThroughBitfieldLValue(RValue Src, LValue Dst,
+                                                     llvm::Value **Result) {
+  const CGBitFieldInfo &Info = Dst.getBitFieldInfo();
+  llvm::Type *ResLTy = ConvertTypeForMem(Dst.getType());
+  Address Ptr = Dst.getBitFieldAddress();
+
+  // Get the source value, truncated to the width of the bit-field.
+  llvm::Value *SrcVal = Src.getScalarVal();
+
+  // Cast the source to the storage type and shift it into place.
+  SrcVal = Builder.CreateIntCast(SrcVal, Ptr.getElementType(),
+                                 /*isSigned=*/false);
+  llvm::Value *MaskedVal = SrcVal;
+
+  // See if there are other bits in the bitfield's storage we'll need to load
+  // and mask together with source before storing.
+  if (Info.StorageSize != Info.Size) {
+    assert(Info.StorageSize > Info.Size && "Invalid bitfield size.");
+    llvm::Value *Val =
+      Builder.CreateLoad(Ptr, Dst.isVolatileQualified(), "bf.load");
+
+    // Mask the source value as needed.
+    if (!hasBooleanRepresentation(Dst.getType()))
+      SrcVal = Builder.CreateAnd(SrcVal,
+                                 llvm::APInt::getLowBitsSet(Info.StorageSize,
+                                                            Info.Size),
+                                 "bf.value");
+    MaskedVal = SrcVal;
+    if (Info.Offset)
+      SrcVal = Builder.CreateShl(SrcVal, Info.Offset, "bf.shl");
+
+    // Mask out the original value.
+    Val = Builder.CreateAnd(Val,
+                            ~llvm::APInt::getBitsSet(Info.StorageSize,
+                                                     Info.Offset,
+                                                     Info.Offset + Info.Size),
+                            "bf.clear");
+
+    // Or together the unchanged values and the source value.
+    SrcVal = Builder.CreateOr(Val, SrcVal, "bf.set");
+  } else {
+    assert(Info.Offset == 0);
+  }
+
+  // Write the new value back out.
+  Builder.CreateStore(SrcVal, Ptr, Dst.isVolatileQualified());
+
+  // Return the new value of the bit-field, if requested.
+  if (Result) {
+    llvm::Value *ResultVal = MaskedVal;
+
+    // Sign extend the value if needed.
+    if (Info.IsSigned) {
+      assert(Info.Size <= Info.StorageSize);
+      unsigned HighBits = Info.StorageSize - Info.Size;
+      if (HighBits) {
+        ResultVal = Builder.CreateShl(ResultVal, HighBits, "bf.result.shl");
+        ResultVal = Builder.CreateAShr(ResultVal, HighBits, "bf.result.ashr");
+      }
+    }
+
+    ResultVal = Builder.CreateIntCast(ResultVal, ResLTy, Info.IsSigned,
+                                      "bf.result.cast");
+    *Result = EmitFromMemory(ResultVal, Dst.getType());
+  }
+}
+
+void CodeGenFunction::EmitStoreThroughExtVectorComponentLValue(RValue Src,
+                                                               LValue Dst) {
+  // This access turns into a read/modify/write of the vector.  Load the input
+  // value now.
+  llvm::Value *Vec = Builder.CreateLoad(Dst.getExtVectorAddress(),
+                                        Dst.isVolatileQualified());
+  const llvm::Constant *Elts = Dst.getExtVectorElts();
+
+  llvm::Value *SrcVal = Src.getScalarVal();
+
+  if (const VectorType *VTy = Dst.getType()->getAs<VectorType>()) {
+    unsigned NumSrcElts = VTy->getNumElements();
+    unsigned NumDstElts = Vec->getType()->getVectorNumElements();
+    if (NumDstElts == NumSrcElts) {
+      // Use shuffle vector is the src and destination are the same number of
+      // elements and restore the vector mask since it is on the side it will be
+      // stored.
+      SmallVector<llvm::Constant*, 4> Mask(NumDstElts);
+      for (unsigned i = 0; i != NumSrcElts; ++i)
+        Mask[getAccessedFieldNo(i, Elts)] = Builder.getInt32(i);
+
+      llvm::Value *MaskV = llvm::ConstantVector::get(Mask);
+      Vec = Builder.CreateShuffleVector(SrcVal,
+                                        llvm::UndefValue::get(Vec->getType()),
+                                        MaskV);
+    } else if (NumDstElts > NumSrcElts) {
+      // Extended the source vector to the same length and then shuffle it
+      // into the destination.
+      // FIXME: since we're shuffling with undef, can we just use the indices
+      //        into that?  This could be simpler.
+      SmallVector<llvm::Constant*, 4> ExtMask;
+      for (unsigned i = 0; i != NumSrcElts; ++i)
+        ExtMask.push_back(Builder.getInt32(i));
+      ExtMask.resize(NumDstElts, llvm::UndefValue::get(Int32Ty));
+      llvm::Value *ExtMaskV = llvm::ConstantVector::get(ExtMask);
+      llvm::Value *ExtSrcVal =
+        Builder.CreateShuffleVector(SrcVal,
+                                    llvm::UndefValue::get(SrcVal->getType()),
+                                    ExtMaskV);
+      // build identity
+      SmallVector<llvm::Constant*, 4> Mask;
+      for (unsigned i = 0; i != NumDstElts; ++i)
+        Mask.push_back(Builder.getInt32(i));
+
+      // When the vector size is odd and .odd or .hi is used, the last element
+      // of the Elts constant array will be one past the size of the vector.
+      // Ignore the last element here, if it is greater than the mask size.
+      if (getAccessedFieldNo(NumSrcElts - 1, Elts) == Mask.size())
+        NumSrcElts--;
+
+      // modify when what gets shuffled in
+      for (unsigned i = 0; i != NumSrcElts; ++i)
+        Mask[getAccessedFieldNo(i, Elts)] = Builder.getInt32(i+NumDstElts);
+      llvm::Value *MaskV = llvm::ConstantVector::get(Mask);
+      Vec = Builder.CreateShuffleVector(Vec, ExtSrcVal, MaskV);
+    } else {
+      // We should never shorten the vector
+      llvm_unreachable("unexpected shorten vector length");
+    }
+  } else {
+    // If the Src is a scalar (not a vector) it must be updating one element.
+    unsigned InIdx = getAccessedFieldNo(0, Elts);
+    llvm::Value *Elt = llvm::ConstantInt::get(SizeTy, InIdx);
+    Vec = Builder.CreateInsertElement(Vec, SrcVal, Elt);
+  }
+
+  Builder.CreateStore(Vec, Dst.getExtVectorAddress(),
+                      Dst.isVolatileQualified());
+}
+
+/// Store of global named registers are always calls to intrinsics.
+void CodeGenFunction::EmitStoreThroughGlobalRegLValue(RValue Src, LValue Dst) {
+  assert((Dst.getType()->isIntegerType() || Dst.getType()->isPointerType()) &&
+         "Bad type for register variable");
+  llvm::MDNode *RegName = cast<llvm::MDNode>(
+      cast<llvm::MetadataAsValue>(Dst.getGlobalReg())->getMetadata());
+  assert(RegName && "Register LValue is not metadata");
+
+  // We accept integer and pointer types only
+  llvm::Type *OrigTy = CGM.getTypes().ConvertType(Dst.getType());
+  llvm::Type *Ty = OrigTy;
+  if (OrigTy->isPointerTy())
+    Ty = CGM.getTypes().getDataLayout().getIntPtrType(OrigTy);
+  llvm::Type *Types[] = { Ty };
+
+  llvm::Function *F = CGM.getIntrinsic(llvm::Intrinsic::write_register, Types);
+  llvm::Value *Value = Src.getScalarVal();
+  if (OrigTy->isPointerTy())
+    Value = Builder.CreatePtrToInt(Value, Ty);
+  Builder.CreateCall(
+      F, {llvm::MetadataAsValue::get(Ty->getContext(), RegName), Value});
+}
+
+// setObjCGCLValueClass - sets class of the lvalue for the purpose of
+// generating write-barries API. It is currently a global, ivar,
+// or neither.
+static void setObjCGCLValueClass(const ASTContext &Ctx, const Expr *E,
+                                 LValue &LV,
+                                 bool IsMemberAccess=false) {
+  if (Ctx.getLangOpts().getGC() == LangOptions::NonGC)
+    return;
+
+  if (isa<ObjCIvarRefExpr>(E)) {
+    QualType ExpTy = E->getType();
+    if (IsMemberAccess && ExpTy->isPointerType()) {
+      // If ivar is a structure pointer, assigning to field of
+      // this struct follows gcc's behavior and makes it a non-ivar
+      // writer-barrier conservatively.
+      ExpTy = ExpTy->castAs<PointerType>()->getPointeeType();
+      if (ExpTy->isRecordType()) {
+        LV.setObjCIvar(false);
+        return;
+      }
+    }
+    LV.setObjCIvar(true);
+    auto *Exp = cast<ObjCIvarRefExpr>(const_cast<Expr *>(E));
+    LV.setBaseIvarExp(Exp->getBase());
+    LV.setObjCArray(E->getType()->isArrayType());
+    return;
+  }
+
+  if (const auto *Exp = dyn_cast<DeclRefExpr>(E)) {
+    if (const auto *VD = dyn_cast<VarDecl>(Exp->getDecl())) {
+      if (VD->hasGlobalStorage()) {
+        LV.setGlobalObjCRef(true);
+        LV.setThreadLocalRef(VD->getTLSKind() != VarDecl::TLS_None);
+      }
+    }
+    LV.setObjCArray(E->getType()->isArrayType());
+    return;
+  }
+
+  if (const auto *Exp = dyn_cast<UnaryOperator>(E)) {
+    setObjCGCLValueClass(Ctx, Exp->getSubExpr(), LV, IsMemberAccess);
+    return;
+  }
+
+  if (const auto *Exp = dyn_cast<ParenExpr>(E)) {
+    setObjCGCLValueClass(Ctx, Exp->getSubExpr(), LV, IsMemberAccess);
+    if (LV.isObjCIvar()) {
+      // If cast is to a structure pointer, follow gcc's behavior and make it
+      // a non-ivar write-barrier.
+      QualType ExpTy = E->getType();
+      if (ExpTy->isPointerType())
+        ExpTy = ExpTy->castAs<PointerType>()->getPointeeType();
+      if (ExpTy->isRecordType())
+        LV.setObjCIvar(false);
+    }
+    return;
+  }
+
+  if (const auto *Exp = dyn_cast<GenericSelectionExpr>(E)) {
+    setObjCGCLValueClass(Ctx, Exp->getResultExpr(), LV);
+    return;
+  }
+
+  if (const auto *Exp = dyn_cast<ImplicitCastExpr>(E)) {
+    setObjCGCLValueClass(Ctx, Exp->getSubExpr(), LV, IsMemberAccess);
+    return;
+  }
+
+  if (const auto *Exp = dyn_cast<CStyleCastExpr>(E)) {
+    setObjCGCLValueClass(Ctx, Exp->getSubExpr(), LV, IsMemberAccess);
+    return;
+  }
+
+  if (const auto *Exp = dyn_cast<ObjCBridgedCastExpr>(E)) {
+    setObjCGCLValueClass(Ctx, Exp->getSubExpr(), LV, IsMemberAccess);
+    return;
+  }
+
+  if (const auto *Exp = dyn_cast<ArraySubscriptExpr>(E)) {
+    setObjCGCLValueClass(Ctx, Exp->getBase(), LV);
+    if (LV.isObjCIvar() && !LV.isObjCArray())
+      // Using array syntax to assigning to what an ivar points to is not
+      // same as assigning to the ivar itself. {id *Names;} Names[i] = 0;
+      LV.setObjCIvar(false);
+    else if (LV.isGlobalObjCRef() && !LV.isObjCArray())
+      // Using array syntax to assigning to what global points to is not
+      // same as assigning to the global itself. {id *G;} G[i] = 0;
+      LV.setGlobalObjCRef(false);
+    return;
+  }
+
+  if (const auto *Exp = dyn_cast<MemberExpr>(E)) {
+    setObjCGCLValueClass(Ctx, Exp->getBase(), LV, true);
+    // We don't know if member is an 'ivar', but this flag is looked at
+    // only in the context of LV.isObjCIvar().
+    LV.setObjCArray(E->getType()->isArrayType());
+    return;
+  }
+}
+
+static llvm::Value *
+EmitBitCastOfLValueToProperType(CodeGenFunction &CGF,
+                                llvm::Value *V, llvm::Type *IRType,
+                                StringRef Name = StringRef()) {
+  unsigned AS = cast<llvm::PointerType>(V->getType())->getAddressSpace();
+  return CGF.Builder.CreateBitCast(V, IRType->getPointerTo(AS), Name);
+}
+
+static LValue EmitThreadPrivateVarDeclLValue(
+    CodeGenFunction &CGF, const VarDecl *VD, QualType T, Address Addr,
+    llvm::Type *RealVarTy, SourceLocation Loc) {
+  Addr = CGF.CGM.getOpenMPRuntime().getAddrOfThreadPrivate(CGF, VD, Addr, Loc);
+  Addr = CGF.Builder.CreateElementBitCast(Addr, RealVarTy);
+  return CGF.MakeAddrLValue(Addr, T, AlignmentSource::Decl);
+}
+
+static Address emitDeclTargetVarDeclLValue(CodeGenFunction &CGF,
+                                           const VarDecl *VD, QualType T) {
+  llvm::Optional<OMPDeclareTargetDeclAttr::MapTypeTy> Res =
+      OMPDeclareTargetDeclAttr::isDeclareTargetDeclaration(VD);
+  // Return an invalid address if variable is MT_To and unified
+  // memory is not enabled. For all other cases: MT_Link and
+  // MT_To with unified memory, return a valid address.
+  if (!Res || (*Res == OMPDeclareTargetDeclAttr::MT_To &&
+               !CGF.CGM.getOpenMPRuntime().hasRequiresUnifiedSharedMemory()))
+    return Address::invalid();
+  assert(((*Res == OMPDeclareTargetDeclAttr::MT_Link) ||
+          (*Res == OMPDeclareTargetDeclAttr::MT_To &&
+           CGF.CGM.getOpenMPRuntime().hasRequiresUnifiedSharedMemory())) &&
+         "Expected link clause OR to clause with unified memory enabled.");
+  QualType PtrTy = CGF.getContext().getPointerType(VD->getType());
+  Address Addr = CGF.CGM.getOpenMPRuntime().getAddrOfDeclareTargetVar(VD);
+  return CGF.EmitLoadOfPointer(Addr, PtrTy->castAs<PointerType>());
+}
+
+Address
+CodeGenFunction::EmitLoadOfReference(LValue RefLVal,
+                                     LValueBaseInfo *PointeeBaseInfo,
+                                     TBAAAccessInfo *PointeeTBAAInfo) {
+  llvm::LoadInst *Load =
+      Builder.CreateLoad(RefLVal.getAddress(*this), RefLVal.isVolatile());
+  CGM.DecorateInstructionWithTBAA(Load, RefLVal.getTBAAInfo());
+
+  CharUnits Align = getNaturalTypeAlignment(RefLVal.getType()->getPointeeType(),
+                                            PointeeBaseInfo, PointeeTBAAInfo,
+                                            /* forPointeeType= */ true);
+  return Address(Load, Align);
+}
+
+LValue CodeGenFunction::EmitLoadOfReferenceLValue(LValue RefLVal) {
+  LValueBaseInfo PointeeBaseInfo;
+  TBAAAccessInfo PointeeTBAAInfo;
+  Address PointeeAddr = EmitLoadOfReference(RefLVal, &PointeeBaseInfo,
+                                            &PointeeTBAAInfo);
+  return MakeAddrLValue(PointeeAddr, RefLVal.getType()->getPointeeType(),
+                        PointeeBaseInfo, PointeeTBAAInfo);
+}
+
+Address CodeGenFunction::EmitLoadOfPointer(Address Ptr,
+                                           const PointerType *PtrTy,
+                                           LValueBaseInfo *BaseInfo,
+                                           TBAAAccessInfo *TBAAInfo) {
+  llvm::Value *Addr = Builder.CreateLoad(Ptr);
+  return Address(Addr, getNaturalTypeAlignment(PtrTy->getPointeeType(),
+                                               BaseInfo, TBAAInfo,
+                                               /*forPointeeType=*/true));
+}
+
+LValue CodeGenFunction::EmitLoadOfPointerLValue(Address PtrAddr,
+                                                const PointerType *PtrTy) {
+  LValueBaseInfo BaseInfo;
+  TBAAAccessInfo TBAAInfo;
+  Address Addr = EmitLoadOfPointer(PtrAddr, PtrTy, &BaseInfo, &TBAAInfo);
+  return MakeAddrLValue(Addr, PtrTy->getPointeeType(), BaseInfo, TBAAInfo);
+}
+
+static LValue EmitGlobalVarDeclLValue(CodeGenFunction &CGF,
+                                      const Expr *E, const VarDecl *VD) {
+  QualType T = E->getType();
+
+  // If it's thread_local, emit a call to its wrapper function instead.
+  if (VD->getTLSKind() == VarDecl::TLS_Dynamic &&
+      CGF.CGM.getCXXABI().usesThreadWrapperFunction(VD))
+    return CGF.CGM.getCXXABI().EmitThreadLocalVarDeclLValue(CGF, VD, T);
+  // Check if the variable is marked as declare target with link clause in
+  // device codegen.
+  if (CGF.getLangOpts().OpenMPIsDevice) {
+    Address Addr = emitDeclTargetVarDeclLValue(CGF, VD, T);
+    if (Addr.isValid())
+      return CGF.MakeAddrLValue(Addr, T, AlignmentSource::Decl);
+  }
+
+  llvm::Value *V = CGF.CGM.GetAddrOfGlobalVar(VD);
+  llvm::Type *RealVarTy = CGF.getTypes().ConvertTypeForMem(VD->getType());
+  V = EmitBitCastOfLValueToProperType(CGF, V, RealVarTy);
+  CharUnits Alignment = CGF.getContext().getDeclAlign(VD);
+  Address Addr(V, Alignment);
+  // Emit reference to the private copy of the variable if it is an OpenMP
+  // threadprivate variable.
+  if (CGF.getLangOpts().OpenMP && !CGF.getLangOpts().OpenMPSimd &&
+      VD->hasAttr<OMPThreadPrivateDeclAttr>()) {
+    return EmitThreadPrivateVarDeclLValue(CGF, VD, T, Addr, RealVarTy,
+                                          E->getExprLoc());
+  }
+  LValue LV = VD->getType()->isReferenceType() ?
+      CGF.EmitLoadOfReferenceLValue(Addr, VD->getType(),
+                                    AlignmentSource::Decl) :
+      CGF.MakeAddrLValue(Addr, T, AlignmentSource::Decl);
+  setObjCGCLValueClass(CGF.getContext(), E, LV);
+  return LV;
+}
+
+static llvm::Constant *EmitFunctionDeclPointer(CodeGenModule &CGM,
+                                               const FunctionDecl *FD) {
+  if (FD->hasAttr<WeakRefAttr>()) {
+    ConstantAddress aliasee = CGM.GetWeakRefReference(FD);
+    return aliasee.getPointer();
+  }
+
+  llvm::Constant *V = CGM.GetAddrOfFunction(FD);
+  if (!FD->hasPrototype()) {
+    if (const FunctionProtoType *Proto =
+            FD->getType()->getAs<FunctionProtoType>()) {
+      // Ugly case: for a K&R-style definition, the type of the definition
+      // isn't the same as the type of a use.  Correct for this with a
+      // bitcast.
+      QualType NoProtoType =
+          CGM.getContext().getFunctionNoProtoType(Proto->getReturnType());
+      NoProtoType = CGM.getContext().getPointerType(NoProtoType);
+      V = llvm::ConstantExpr::getBitCast(V,
+                                      CGM.getTypes().ConvertType(NoProtoType));
+    }
+  }
+  return V;
+}
+
+static LValue EmitFunctionDeclLValue(CodeGenFunction &CGF,
+                                     const Expr *E, const FunctionDecl *FD) {
+  llvm::Value *V = EmitFunctionDeclPointer(CGF.CGM, FD);
+  CharUnits Alignment = CGF.getContext().getDeclAlign(FD);
+  return CGF.MakeAddrLValue(V, E->getType(), Alignment,
+                            AlignmentSource::Decl);
+}
+
+static LValue EmitCapturedFieldLValue(CodeGenFunction &CGF, const FieldDecl *FD,
+                                      llvm::Value *ThisValue) {
+  QualType TagType = CGF.getContext().getTagDeclType(FD->getParent());
+  LValue LV = CGF.MakeNaturalAlignAddrLValue(ThisValue, TagType);
+  return CGF.EmitLValueForField(LV, FD);
+}
+
+/// Named Registers are named metadata pointing to the register name
+/// which will be read from/written to as an argument to the intrinsic
+/// @llvm.read/write_register.
+/// So far, only the name is being passed down, but other options such as
+/// register type, allocation type or even optimization options could be
+/// passed down via the metadata node.
+static LValue EmitGlobalNamedRegister(const VarDecl *VD, CodeGenModule &CGM) {
+  SmallString<64> Name("llvm.named.register.");
+  AsmLabelAttr *Asm = VD->getAttr<AsmLabelAttr>();
+  assert(Asm->getLabel().size() < 64-Name.size() &&
+      "Register name too big");
+  Name.append(Asm->getLabel());
+  llvm::NamedMDNode *M =
+    CGM.getModule().getOrInsertNamedMetadata(Name);
+  if (M->getNumOperands() == 0) {
+    llvm::MDString *Str = llvm::MDString::get(CGM.getLLVMContext(),
+                                              Asm->getLabel());
+    llvm::Metadata *Ops[] = {Str};
+    M->addOperand(llvm::MDNode::get(CGM.getLLVMContext(), Ops));
+  }
+
+  CharUnits Alignment = CGM.getContext().getDeclAlign(VD);
+
+  llvm::Value *Ptr =
+    llvm::MetadataAsValue::get(CGM.getLLVMContext(), M->getOperand(0));
+  return LValue::MakeGlobalReg(Address(Ptr, Alignment), VD->getType());
+}
+
+/// Determine whether we can emit a reference to \p VD from the current
+/// context, despite not necessarily having seen an odr-use of the variable in
+/// this context.
+static bool canEmitSpuriousReferenceToVariable(CodeGenFunction &CGF,
+                                               const DeclRefExpr *E,
+                                               const VarDecl *VD,
+                                               bool IsConstant) {
+  // For a variable declared in an enclosing scope, do not emit a spurious
+  // reference even if we have a capture, as that will emit an unwarranted
+  // reference to our capture state, and will likely generate worse code than
+  // emitting a local copy.
+  if (E->refersToEnclosingVariableOrCapture())
+    return false;
+
+  // For a local declaration declared in this function, we can always reference
+  // it even if we don't have an odr-use.
+  if (VD->hasLocalStorage()) {
+    return VD->getDeclContext() ==
+           dyn_cast_or_null<DeclContext>(CGF.CurCodeDecl);
+  }
+
+  // For a global declaration, we can emit a reference to it if we know
+  // for sure that we are able to emit a definition of it.
+  VD = VD->getDefinition(CGF.getContext());
+  if (!VD)
+    return false;
+
+  // Don't emit a spurious reference if it might be to a variable that only
+  // exists on a different device / target.
+  // FIXME: This is unnecessarily broad. Check whether this would actually be a
+  // cross-target reference.
+  if (CGF.getLangOpts().OpenMP || CGF.getLangOpts().CUDA ||
+      CGF.getLangOpts().OpenCL) {
+    return false;
+  }
+
+  // We can emit a spurious reference only if the linkage implies that we'll
+  // be emitting a non-interposable symbol that will be retained until link
+  // time.
+  switch (CGF.CGM.getLLVMLinkageVarDefinition(VD, IsConstant)) {
+  case llvm::GlobalValue::ExternalLinkage:
+  case llvm::GlobalValue::LinkOnceODRLinkage:
+  case llvm::GlobalValue::WeakODRLinkage:
+  case llvm::GlobalValue::InternalLinkage:
+  case llvm::GlobalValue::PrivateLinkage:
+    return true;
+  default:
+    return false;
+  }
+}
+
+LValue CodeGenFunction::EmitDeclRefLValue(const DeclRefExpr *E) {
+  const NamedDecl *ND = E->getDecl();
+  QualType T = E->getType();
+
+  assert(E->isNonOdrUse() != NOUR_Unevaluated &&
+         "should not emit an unevaluated operand");
+
+  if (const auto *VD = dyn_cast<VarDecl>(ND)) {
+    // Global Named registers access via intrinsics only
+    if (VD->getStorageClass() == SC_Register &&
+        VD->hasAttr<AsmLabelAttr>() && !VD->isLocalVarDecl())
+      return EmitGlobalNamedRegister(VD, CGM);
+
+    // If this DeclRefExpr does not constitute an odr-use of the variable,
+    // we're not permitted to emit a reference to it in general, and it might
+    // not be captured if capture would be necessary for a use. Emit the
+    // constant value directly instead.
+    if (E->isNonOdrUse() == NOUR_Constant &&
+        (VD->getType()->isReferenceType() ||
+         !canEmitSpuriousReferenceToVariable(*this, E, VD, true))) {
+      VD->getAnyInitializer(VD);
+      llvm::Constant *Val = ConstantEmitter(*this).emitAbstract(
+          E->getLocation(), *VD->evaluateValue(), VD->getType());
+      assert(Val && "failed to emit constant expression");
+
+      Address Addr = Address::invalid();
+      if (!VD->getType()->isReferenceType()) {
+        // Spill the constant value to a global.
+        Addr = CGM.createUnnamedGlobalFrom(*VD, Val,
+                                           getContext().getDeclAlign(VD));
+        llvm::Type *VarTy = getTypes().ConvertTypeForMem(VD->getType());
+        auto *PTy = llvm::PointerType::get(
+            VarTy, getContext().getTargetAddressSpace(VD->getType()));
+        if (PTy != Addr.getType())
+          Addr = Builder.CreatePointerBitCastOrAddrSpaceCast(Addr, PTy);
+      } else {
+        // Should we be using the alignment of the constant pointer we emitted?
+        CharUnits Alignment =
+            getNaturalTypeAlignment(E->getType(),
+                                    /* BaseInfo= */ nullptr,
+                                    /* TBAAInfo= */ nullptr,
+                                    /* forPointeeType= */ true);
+        Addr = Address(Val, Alignment);
+      }
+      return MakeAddrLValue(Addr, T, AlignmentSource::Decl);
+    }
+
+    // FIXME: Handle other kinds of non-odr-use DeclRefExprs.
+
+    // Check for captured variables.
+    if (E->refersToEnclosingVariableOrCapture()) {
+      VD = VD->getCanonicalDecl();
+      if (auto *FD = LambdaCaptureFields.lookup(VD))
+        return EmitCapturedFieldLValue(*this, FD, CXXABIThisValue);
+      if (CapturedStmtInfo) {
+        auto I = LocalDeclMap.find(VD);
+        if (I != LocalDeclMap.end()) {
+          LValue CapLVal;
+          if (VD->getType()->isReferenceType())
+            CapLVal = EmitLoadOfReferenceLValue(I->second, VD->getType(),
+                                                AlignmentSource::Decl);
+          else
+            CapLVal = MakeAddrLValue(I->second, T);
+          // Mark lvalue as nontemporal if the variable is marked as nontemporal
+          // in simd context.
+          if (getLangOpts().OpenMP &&
+              CGM.getOpenMPRuntime().isNontemporalDecl(VD))
+            CapLVal.setNontemporal(/*Value=*/true);
+          return CapLVal;
+        }
+        LValue CapLVal =
+            EmitCapturedFieldLValue(*this, CapturedStmtInfo->lookup(VD),
+                                    CapturedStmtInfo->getContextValue());
+        CapLVal = MakeAddrLValue(
+            Address(CapLVal.getPointer(*this), getContext().getDeclAlign(VD)),
+            CapLVal.getType(), LValueBaseInfo(AlignmentSource::Decl),
+            CapLVal.getTBAAInfo());
+        // Mark lvalue as nontemporal if the variable is marked as nontemporal
+        // in simd context.
+        if (getLangOpts().OpenMP &&
+            CGM.getOpenMPRuntime().isNontemporalDecl(VD))
+          CapLVal.setNontemporal(/*Value=*/true);
+        return CapLVal;
+      }
+
+      assert(isa<BlockDecl>(CurCodeDecl));
+      Address addr = GetAddrOfBlockDecl(VD);
+      return MakeAddrLValue(addr, T, AlignmentSource::Decl);
+    }
+  }
+
+  // FIXME: We should be able to assert this for FunctionDecls as well!
+  // FIXME: We should be able to assert this for all DeclRefExprs, not just
+  // those with a valid source location.
+  assert((ND->isUsed(false) || !isa<VarDecl>(ND) || E->isNonOdrUse() ||
+          !E->getLocation().isValid()) &&
+         "Should not use decl without marking it used!");
+
+  if (ND->hasAttr<WeakRefAttr>()) {
+    const auto *VD = cast<ValueDecl>(ND);
+    ConstantAddress Aliasee = CGM.GetWeakRefReference(VD);
+    return MakeAddrLValue(Aliasee, T, AlignmentSource::Decl);
+  }
+
+  if (const auto *VD = dyn_cast<VarDecl>(ND)) {
+    // Check if this is a global variable.
+    if (VD->hasLinkage() || VD->isStaticDataMember())
+      return EmitGlobalVarDeclLValue(*this, E, VD);
+
+    Address addr = Address::invalid();
+
+    // The variable should generally be present in the local decl map.
+    auto iter = LocalDeclMap.find(VD);
+    if (iter != LocalDeclMap.end()) {
+      addr = iter->second;
+
+    // Otherwise, it might be static local we haven't emitted yet for
+    // some reason; most likely, because it's in an outer function.
+    } else if (VD->isStaticLocal()) {
+      addr = Address(CGM.getOrCreateStaticVarDecl(
+          *VD, CGM.getLLVMLinkageVarDefinition(VD, /*IsConstant=*/false)),
+                     getContext().getDeclAlign(VD));
+
+    // No other cases for now.
+    } else {
+      llvm_unreachable("DeclRefExpr for Decl not entered in LocalDeclMap?");
+    }
+
+
+    // Check for OpenMP threadprivate variables.
+    if (getLangOpts().OpenMP && !getLangOpts().OpenMPSimd &&
+        VD->hasAttr<OMPThreadPrivateDeclAttr>()) {
+      return EmitThreadPrivateVarDeclLValue(
+          *this, VD, T, addr, getTypes().ConvertTypeForMem(VD->getType()),
+          E->getExprLoc());
+    }
+
+    // Drill into block byref variables.
+    bool isBlockByref = VD->isEscapingByref();
+    if (isBlockByref) {
+      addr = emitBlockByrefAddress(addr, VD);
+    }
+
+    // Drill into reference types.
+    LValue LV = VD->getType()->isReferenceType() ?
+        EmitLoadOfReferenceLValue(addr, VD->getType(), AlignmentSource::Decl) :
+        MakeAddrLValue(addr, T, AlignmentSource::Decl);
+
+    bool isLocalStorage = VD->hasLocalStorage();
+
+    bool NonGCable = isLocalStorage &&
+                     !VD->getType()->isReferenceType() &&
+                     !isBlockByref;
+    if (NonGCable) {
+      LV.getQuals().removeObjCGCAttr();
+      LV.setNonGC(true);
+    }
+
+    bool isImpreciseLifetime =
+      (isLocalStorage && !VD->hasAttr<ObjCPreciseLifetimeAttr>());
+    if (isImpreciseLifetime)
+      LV.setARCPreciseLifetime(ARCImpreciseLifetime);
+    setObjCGCLValueClass(getContext(), E, LV);
+    return LV;
+  }
+
+  if (const auto *FD = dyn_cast<FunctionDecl>(ND))
+    return EmitFunctionDeclLValue(*this, E, FD);
+
+  // FIXME: While we're emitting a binding from an enclosing scope, all other
+  // DeclRefExprs we see should be implicitly treated as if they also refer to
+  // an enclosing scope.
+  if (const auto *BD = dyn_cast<BindingDecl>(ND))
+    return EmitLValue(BD->getBinding());
+
+  llvm_unreachable("Unhandled DeclRefExpr");
+}
+
+LValue CodeGenFunction::EmitUnaryOpLValue(const UnaryOperator *E) {
+  // __extension__ doesn't affect lvalue-ness.
+  if (E->getOpcode() == UO_Extension)
+    return EmitLValue(E->getSubExpr());
+
+  QualType ExprTy = getContext().getCanonicalType(E->getSubExpr()->getType());
+  switch (E->getOpcode()) {
+  default: llvm_unreachable("Unknown unary operator lvalue!");
+  case UO_Deref: {
+    QualType T = E->getSubExpr()->getType()->getPointeeType();
+    assert(!T.isNull() && "CodeGenFunction::EmitUnaryOpLValue: Illegal type");
+
+    LValueBaseInfo BaseInfo;
+    TBAAAccessInfo TBAAInfo;
+    Address Addr = EmitPointerWithAlignment(E->getSubExpr(), &BaseInfo,
+                                            &TBAAInfo);
+    LValue LV = MakeAddrLValue(Addr, T, BaseInfo, TBAAInfo);
+    LV.getQuals().setAddressSpace(ExprTy.getAddressSpace());
+
+    // We should not generate __weak write barrier on indirect reference
+    // of a pointer to object; as in void foo (__weak id *param); *param = 0;
+    // But, we continue to generate __strong write barrier on indirect write
+    // into a pointer to object.
+    if (getLangOpts().ObjC &&
+        getLangOpts().getGC() != LangOptions::NonGC &&
+        LV.isObjCWeak())
+      LV.setNonGC(!E->isOBJCGCCandidate(getContext()));
+    return LV;
+  }
+  case UO_Real:
+  case UO_Imag: {
+    LValue LV = EmitLValue(E->getSubExpr());
+    assert(LV.isSimple() && "real/imag on non-ordinary l-value");
+
+    // __real is valid on scalars.  This is a faster way of testing that.
+    // __imag can only produce an rvalue on scalars.
+    if (E->getOpcode() == UO_Real &&
+        !LV.getAddress(*this).getElementType()->isStructTy()) {
+      assert(E->getSubExpr()->getType()->isArithmeticType());
+      return LV;
+    }
+
+    QualType T = ExprTy->castAs<ComplexType>()->getElementType();
+
+    Address Component =
+        (E->getOpcode() == UO_Real
+             ? emitAddrOfRealComponent(LV.getAddress(*this), LV.getType())
+             : emitAddrOfImagComponent(LV.getAddress(*this), LV.getType()));
+    LValue ElemLV = MakeAddrLValue(Component, T, LV.getBaseInfo(),
+                                   CGM.getTBAAInfoForSubobject(LV, T));
+    ElemLV.getQuals().addQualifiers(LV.getQuals());
+    return ElemLV;
+  }
+  case UO_PreInc:
+  case UO_PreDec: {
+    LValue LV = EmitLValue(E->getSubExpr());
+    bool isInc = E->getOpcode() == UO_PreInc;
+
+    if (E->getType()->isAnyComplexType())
+      EmitComplexPrePostIncDec(E, LV, isInc, true/*isPre*/);
+    else
+      EmitScalarPrePostIncDec(E, LV, isInc, true/*isPre*/);
+    return LV;
+  }
+  }
+}
+
+LValue CodeGenFunction::EmitStringLiteralLValue(const StringLiteral *E) {
+  return MakeAddrLValue(CGM.GetAddrOfConstantStringFromLiteral(E),
+                        E->getType(), AlignmentSource::Decl);
+}
+
+LValue CodeGenFunction::EmitObjCEncodeExprLValue(const ObjCEncodeExpr *E) {
+  return MakeAddrLValue(CGM.GetAddrOfConstantStringFromObjCEncode(E),
+                        E->getType(), AlignmentSource::Decl);
+}
+
+LValue CodeGenFunction::EmitPredefinedLValue(const PredefinedExpr *E) {
+  auto SL = E->getFunctionName();
+  assert(SL != nullptr && "No StringLiteral name in PredefinedExpr");
+  StringRef FnName = CurFn->getName();
+  if (FnName.startswith("\01"))
+    FnName = FnName.substr(1);
+  StringRef NameItems[] = {
+      PredefinedExpr::getIdentKindName(E->getIdentKind()), FnName};
+  std::string GVName = llvm::join(NameItems, NameItems + 2, ".");
+  if (auto *BD = dyn_cast_or_null<BlockDecl>(CurCodeDecl)) {
+    std::string Name = SL->getString();
+    if (!Name.empty()) {
+      unsigned Discriminator =
+          CGM.getCXXABI().getMangleContext().getBlockId(BD, true);
+      if (Discriminator)
+        Name += "_" + Twine(Discriminator + 1).str();
+      auto C = CGM.GetAddrOfConstantCString(Name, GVName.c_str());
+      return MakeAddrLValue(C, E->getType(), AlignmentSource::Decl);
+    } else {
+      auto C = CGM.GetAddrOfConstantCString(FnName, GVName.c_str());
+      return MakeAddrLValue(C, E->getType(), AlignmentSource::Decl);
+    }
+  }
+  auto C = CGM.GetAddrOfConstantStringFromLiteral(SL, GVName);
+  return MakeAddrLValue(C, E->getType(), AlignmentSource::Decl);
+}
+
+/// Emit a type description suitable for use by a runtime sanitizer library. The
+/// format of a type descriptor is
+///
+/// \code
+///   { i16 TypeKind, i16 TypeInfo }
+/// \endcode
+///
+/// followed by an array of i8 containing the type name. TypeKind is 0 for an
+/// integer, 1 for a floating point value, and -1 for anything else.
+llvm::Constant *CodeGenFunction::EmitCheckTypeDescriptor(QualType T) {
+  // Only emit each type's descriptor once.
+  if (llvm::Constant *C = CGM.getTypeDescriptorFromMap(T))
+    return C;
+
+  uint16_t TypeKind = -1;
+  uint16_t TypeInfo = 0;
+
+  if (T->isIntegerType()) {
+    TypeKind = 0;
+    TypeInfo = (llvm::Log2_32(getContext().getTypeSize(T)) << 1) |
+               (T->isSignedIntegerType() ? 1 : 0);
+  } else if (T->isFloatingType()) {
+    TypeKind = 1;
+    TypeInfo = getContext().getTypeSize(T);
+  }
+
+  // Format the type name as if for a diagnostic, including quotes and
+  // optionally an 'aka'.
+  SmallString<32> Buffer;
+  CGM.getDiags().ConvertArgToString(DiagnosticsEngine::ak_qualtype,
+                                    (intptr_t)T.getAsOpaquePtr(),
+                                    StringRef(), StringRef(), None, Buffer,
+                                    None);
+
+  llvm::Constant *Components[] = {
+    Builder.getInt16(TypeKind), Builder.getInt16(TypeInfo),
+    llvm::ConstantDataArray::getString(getLLVMContext(), Buffer)
+  };
+  llvm::Constant *Descriptor = llvm::ConstantStruct::getAnon(Components);
+
+  auto *GV = new llvm::GlobalVariable(
+      CGM.getModule(), Descriptor->getType(),
+      /*isConstant=*/true, llvm::GlobalVariable::PrivateLinkage, Descriptor);
+  GV->setUnnamedAddr(llvm::GlobalValue::UnnamedAddr::Global);
+  CGM.getSanitizerMetadata()->disableSanitizerForGlobal(GV);
+
+  // Remember the descriptor for this type.
+  CGM.setTypeDescriptorInMap(T, GV);
+
+  return GV;
+}
+
+llvm::Value *CodeGenFunction::EmitCheckValue(llvm::Value *V) {
+  llvm::Type *TargetTy = IntPtrTy;
+
+  if (V->getType() == TargetTy)
+    return V;
+
+  // Floating-point types which fit into intptr_t are bitcast to integers
+  // and then passed directly (after zero-extension, if necessary).
+  if (V->getType()->isFloatingPointTy()) {
+    unsigned Bits = V->getType()->getPrimitiveSizeInBits();
+    if (Bits <= TargetTy->getIntegerBitWidth())
+      V = Builder.CreateBitCast(V, llvm::Type::getIntNTy(getLLVMContext(),
+                                                         Bits));
+  }
+
+  // Integers which fit in intptr_t are zero-extended and passed directly.
+  if (V->getType()->isIntegerTy() &&
+      V->getType()->getIntegerBitWidth() <= TargetTy->getIntegerBitWidth())
+    return Builder.CreateZExt(V, TargetTy);
+
+  // Pointers are passed directly, everything else is passed by address.
+  if (!V->getType()->isPointerTy()) {
+    Address Ptr = CreateDefaultAlignTempAlloca(V->getType());
+    Builder.CreateStore(V, Ptr);
+    V = Ptr.getPointer();
+  }
+  return Builder.CreatePtrToInt(V, TargetTy);
+}
+
+/// Emit a representation of a SourceLocation for passing to a handler
+/// in a sanitizer runtime library. The format for this data is:
+/// \code
+///   struct SourceLocation {
+///     const char *Filename;
+///     int32_t Line, Column;
+///   };
+/// \endcode
+/// For an invalid SourceLocation, the Filename pointer is null.
+llvm::Constant *CodeGenFunction::EmitCheckSourceLocation(SourceLocation Loc) {
+  llvm::Constant *Filename;
+  int Line, Column;
+
+  PresumedLoc PLoc = getContext().getSourceManager().getPresumedLoc(Loc);
+  if (PLoc.isValid()) {
+    StringRef FilenameString = PLoc.getFilename();
+
+    int PathComponentsToStrip =
+        CGM.getCodeGenOpts().EmitCheckPathComponentsToStrip;
+    if (PathComponentsToStrip < 0) {
+      assert(PathComponentsToStrip != INT_MIN);
+      int PathComponentsToKeep = -PathComponentsToStrip;
+      auto I = llvm::sys::path::rbegin(FilenameString);
+      auto E = llvm::sys::path::rend(FilenameString);
+      while (I != E && --PathComponentsToKeep)
+        ++I;
+
+      FilenameString = FilenameString.substr(I - E);
+    } else if (PathComponentsToStrip > 0) {
+      auto I = llvm::sys::path::begin(FilenameString);
+      auto E = llvm::sys::path::end(FilenameString);
+      while (I != E && PathComponentsToStrip--)
+        ++I;
+
+      if (I != E)
+        FilenameString =
+            FilenameString.substr(I - llvm::sys::path::begin(FilenameString));
+      else
+        FilenameString = llvm::sys::path::filename(FilenameString);
+    }
+
+    auto FilenameGV = CGM.GetAddrOfConstantCString(FilenameString, ".src");
+    CGM.getSanitizerMetadata()->disableSanitizerForGlobal(
+                          cast<llvm::GlobalVariable>(FilenameGV.getPointer()));
+    Filename = FilenameGV.getPointer();
+    Line = PLoc.getLine();
+    Column = PLoc.getColumn();
+  } else {
+    Filename = llvm::Constant::getNullValue(Int8PtrTy);
+    Line = Column = 0;
+  }
+
+  llvm::Constant *Data[] = {Filename, Builder.getInt32(Line),
+                            Builder.getInt32(Column)};
+
+  return llvm::ConstantStruct::getAnon(Data);
+}
+
+namespace {
+/// Specify under what conditions this check can be recovered
+enum class CheckRecoverableKind {
+  /// Always terminate program execution if this check fails.
+  Unrecoverable,
+  /// Check supports recovering, runtime has both fatal (noreturn) and
+  /// non-fatal handlers for this check.
+  Recoverable,
+  /// Runtime conditionally aborts, always need to support recovery.
+  AlwaysRecoverable
+};
+}
+
+static CheckRecoverableKind getRecoverableKind(SanitizerMask Kind) {
+  assert(Kind.countPopulation() == 1);
+  if (Kind == SanitizerKind::Function || Kind == SanitizerKind::Vptr)
+    return CheckRecoverableKind::AlwaysRecoverable;
+  else if (Kind == SanitizerKind::Return || Kind == SanitizerKind::Unreachable)
+    return CheckRecoverableKind::Unrecoverable;
+  else
+    return CheckRecoverableKind::Recoverable;
+}
+
+namespace {
+struct SanitizerHandlerInfo {
+  char const *const Name;
+  unsigned Version;
+};
+}
+
+const SanitizerHandlerInfo SanitizerHandlers[] = {
+#define SANITIZER_CHECK(Enum, Name, Version) {#Name, Version},
+    LIST_SANITIZER_CHECKS
+#undef SANITIZER_CHECK
+};
+
+static void emitCheckHandlerCall(CodeGenFunction &CGF,
+                                 llvm::FunctionType *FnType,
+                                 ArrayRef<llvm::Value *> FnArgs,
+                                 SanitizerHandler CheckHandler,
+                                 CheckRecoverableKind RecoverKind, bool IsFatal,
+                                 llvm::BasicBlock *ContBB) {
+  assert(IsFatal || RecoverKind != CheckRecoverableKind::Unrecoverable);
+  Optional<ApplyDebugLocation> DL;
+  if (!CGF.Builder.getCurrentDebugLocation()) {
+    // Ensure that the call has at least an artificial debug location.
+    DL.emplace(CGF, SourceLocation());
+  }
+  bool NeedsAbortSuffix =
+      IsFatal && RecoverKind != CheckRecoverableKind::Unrecoverable;
+  bool MinimalRuntime = CGF.CGM.getCodeGenOpts().SanitizeMinimalRuntime;
+  const SanitizerHandlerInfo &CheckInfo = SanitizerHandlers[CheckHandler];
+  const StringRef CheckName = CheckInfo.Name;
+  std::string FnName = "__ubsan_handle_" + CheckName.str();
+  if (CheckInfo.Version && !MinimalRuntime)
+    FnName += "_v" + llvm::utostr(CheckInfo.Version);
+  if (MinimalRuntime)
+    FnName += "_minimal";
+  if (NeedsAbortSuffix)
+    FnName += "_abort";
+  bool MayReturn =
+      !IsFatal || RecoverKind == CheckRecoverableKind::AlwaysRecoverable;
+
+  llvm::AttrBuilder B;
+  if (!MayReturn) {
+    B.addAttribute(llvm::Attribute::NoReturn)
+        .addAttribute(llvm::Attribute::NoUnwind);
+  }
+  B.addAttribute(llvm::Attribute::UWTable);
+
+  llvm::FunctionCallee Fn = CGF.CGM.CreateRuntimeFunction(
+      FnType, FnName,
+      llvm::AttributeList::get(CGF.getLLVMContext(),
+                               llvm::AttributeList::FunctionIndex, B),
+      /*Local=*/true);
+  llvm::CallInst *HandlerCall = CGF.EmitNounwindRuntimeCall(Fn, FnArgs);
+  if (!MayReturn) {
+    HandlerCall->setDoesNotReturn();
+    CGF.Builder.CreateUnreachable();
+  } else {
+    CGF.Builder.CreateBr(ContBB);
+  }
+}
+
+void CodeGenFunction::EmitCheck(
+    ArrayRef<std::pair<llvm::Value *, SanitizerMask>> Checked,
+    SanitizerHandler CheckHandler, ArrayRef<llvm::Constant *> StaticArgs,
+    ArrayRef<llvm::Value *> DynamicArgs) {
+  assert(IsSanitizerScope);
+  assert(Checked.size() > 0);
+  assert(CheckHandler >= 0 &&
+         size_t(CheckHandler) < llvm::array_lengthof(SanitizerHandlers));
+  const StringRef CheckName = SanitizerHandlers[CheckHandler].Name;
+
+  llvm::Value *FatalCond = nullptr;
+  llvm::Value *RecoverableCond = nullptr;
+  llvm::Value *TrapCond = nullptr;
+  for (int i = 0, n = Checked.size(); i < n; ++i) {
+    llvm::Value *Check = Checked[i].first;
+    // -fsanitize-trap= overrides -fsanitize-recover=.
+    llvm::Value *&Cond =
+        CGM.getCodeGenOpts().SanitizeTrap.has(Checked[i].second)
+            ? TrapCond
+            : CGM.getCodeGenOpts().SanitizeRecover.has(Checked[i].second)
+                  ? RecoverableCond
+                  : FatalCond;
+    Cond = Cond ? Builder.CreateAnd(Cond, Check) : Check;
+  }
+
+  if (TrapCond)
+    EmitTrapCheck(TrapCond);
+  if (!FatalCond && !RecoverableCond)
+    return;
+
+  llvm::Value *JointCond;
+  if (FatalCond && RecoverableCond)
+    JointCond = Builder.CreateAnd(FatalCond, RecoverableCond);
+  else
+    JointCond = FatalCond ? FatalCond : RecoverableCond;
+  assert(JointCond);
+
+  CheckRecoverableKind RecoverKind = getRecoverableKind(Checked[0].second);
+  assert(SanOpts.has(Checked[0].second));
+#ifndef NDEBUG
+  for (int i = 1, n = Checked.size(); i < n; ++i) {
+    assert(RecoverKind == getRecoverableKind(Checked[i].second) &&
+           "All recoverable kinds in a single check must be same!");
+    assert(SanOpts.has(Checked[i].second));
+  }
+#endif
+
+  llvm::BasicBlock *Cont = createBasicBlock("cont");
+  llvm::BasicBlock *Handlers = createBasicBlock("handler." + CheckName);
+  llvm::Instruction *Branch = Builder.CreateCondBr(JointCond, Cont, Handlers);
+  // Give hint that we very much don't expect to execute the handler
+  // Value chosen to match UR_NONTAKEN_WEIGHT, see BranchProbabilityInfo.cpp
+  llvm::MDBuilder MDHelper(getLLVMContext());
+  llvm::MDNode *Node = MDHelper.createBranchWeights((1U << 20) - 1, 1);
+  Branch->setMetadata(llvm::LLVMContext::MD_prof, Node);
+  EmitBlock(Handlers);
+
+  // Handler functions take an i8* pointing to the (handler-specific) static
+  // information block, followed by a sequence of intptr_t arguments
+  // representing operand values.
+  SmallVector<llvm::Value *, 4> Args;
+  SmallVector<llvm::Type *, 4> ArgTypes;
+  if (!CGM.getCodeGenOpts().SanitizeMinimalRuntime) {
+    Args.reserve(DynamicArgs.size() + 1);
+    ArgTypes.reserve(DynamicArgs.size() + 1);
+
+    // Emit handler arguments and create handler function type.
+    if (!StaticArgs.empty()) {
+      llvm::Constant *Info = llvm::ConstantStruct::getAnon(StaticArgs);
+      auto *InfoPtr =
+          new llvm::GlobalVariable(CGM.getModule(), Info->getType(), false,
+                                   llvm::GlobalVariable::PrivateLinkage, Info);
+      InfoPtr->setUnnamedAddr(llvm::GlobalValue::UnnamedAddr::Global);
+      CGM.getSanitizerMetadata()->disableSanitizerForGlobal(InfoPtr);
+      Args.push_back(Builder.CreateBitCast(InfoPtr, Int8PtrTy));
+      ArgTypes.push_back(Int8PtrTy);
+    }
+
+    for (size_t i = 0, n = DynamicArgs.size(); i != n; ++i) {
+      Args.push_back(EmitCheckValue(DynamicArgs[i]));
+      ArgTypes.push_back(IntPtrTy);
+    }
+  }
+
+  llvm::FunctionType *FnType =
+    llvm::FunctionType::get(CGM.VoidTy, ArgTypes, false);
+
+  if (!FatalCond || !RecoverableCond) {
+    // Simple case: we need to generate a single handler call, either
+    // fatal, or non-fatal.
+    emitCheckHandlerCall(*this, FnType, Args, CheckHandler, RecoverKind,
+                         (FatalCond != nullptr), Cont);
+  } else {
+    // Emit two handler calls: first one for set of unrecoverable checks,
+    // another one for recoverable.
+    llvm::BasicBlock *NonFatalHandlerBB =
+        createBasicBlock("non_fatal." + CheckName);
+    llvm::BasicBlock *FatalHandlerBB = createBasicBlock("fatal." + CheckName);
+    Builder.CreateCondBr(FatalCond, NonFatalHandlerBB, FatalHandlerBB);
+    EmitBlock(FatalHandlerBB);
+    emitCheckHandlerCall(*this, FnType, Args, CheckHandler, RecoverKind, true,
+                         NonFatalHandlerBB);
+    EmitBlock(NonFatalHandlerBB);
+    emitCheckHandlerCall(*this, FnType, Args, CheckHandler, RecoverKind, false,
+                         Cont);
+  }
+
+  EmitBlock(Cont);
+}
+
+void CodeGenFunction::EmitCfiSlowPathCheck(
+    SanitizerMask Kind, llvm::Value *Cond, llvm::ConstantInt *TypeId,
+    llvm::Value *Ptr, ArrayRef<llvm::Constant *> StaticArgs) {
+  llvm::BasicBlock *Cont = createBasicBlock("cfi.cont");
+
+  llvm::BasicBlock *CheckBB = createBasicBlock("cfi.slowpath");
+  llvm::BranchInst *BI = Builder.CreateCondBr(Cond, Cont, CheckBB);
+
+  llvm::MDBuilder MDHelper(getLLVMContext());
+  llvm::MDNode *Node = MDHelper.createBranchWeights((1U << 20) - 1, 1);
+  BI->setMetadata(llvm::LLVMContext::MD_prof, Node);
+
+  EmitBlock(CheckBB);
+
+  bool WithDiag = !CGM.getCodeGenOpts().SanitizeTrap.has(Kind);
+
+  llvm::CallInst *CheckCall;
+  llvm::FunctionCallee SlowPathFn;
+  if (WithDiag) {
+    llvm::Constant *Info = llvm::ConstantStruct::getAnon(StaticArgs);
+    auto *InfoPtr =
+        new llvm::GlobalVariable(CGM.getModule(), Info->getType(), false,
+                                 llvm::GlobalVariable::PrivateLinkage, Info);
+    InfoPtr->setUnnamedAddr(llvm::GlobalValue::UnnamedAddr::Global);
+    CGM.getSanitizerMetadata()->disableSanitizerForGlobal(InfoPtr);
+
+    SlowPathFn = CGM.getModule().getOrInsertFunction(
+        "__cfi_slowpath_diag",
+        llvm::FunctionType::get(VoidTy, {Int64Ty, Int8PtrTy, Int8PtrTy},
+                                false));
+    CheckCall = Builder.CreateCall(
+        SlowPathFn, {TypeId, Ptr, Builder.CreateBitCast(InfoPtr, Int8PtrTy)});
+  } else {
+    SlowPathFn = CGM.getModule().getOrInsertFunction(
+        "__cfi_slowpath",
+        llvm::FunctionType::get(VoidTy, {Int64Ty, Int8PtrTy}, false));
+    CheckCall = Builder.CreateCall(SlowPathFn, {TypeId, Ptr});
+  }
+
+  CGM.setDSOLocal(
+      cast<llvm::GlobalValue>(SlowPathFn.getCallee()->stripPointerCasts()));
+  CheckCall->setDoesNotThrow();
+
+  EmitBlock(Cont);
+}
+
+// Emit a stub for __cfi_check function so that the linker knows about this
+// symbol in LTO mode.
+void CodeGenFunction::EmitCfiCheckStub() {
+  llvm::Module *M = &CGM.getModule();
+  auto &Ctx = M->getContext();
+  llvm::Function *F = llvm::Function::Create(
+      llvm::FunctionType::get(VoidTy, {Int64Ty, Int8PtrTy, Int8PtrTy}, false),
+      llvm::GlobalValue::WeakAnyLinkage, "__cfi_check", M);
+  CGM.setDSOLocal(F);
+  llvm::BasicBlock *BB = llvm::BasicBlock::Create(Ctx, "entry", F);
+  // FIXME: consider emitting an intrinsic call like
+  // call void @llvm.cfi_check(i64 %0, i8* %1, i8* %2)
+  // which can be lowered in CrossDSOCFI pass to the actual contents of
+  // __cfi_check. This would allow inlining of __cfi_check calls.
+  llvm::CallInst::Create(
+      llvm::Intrinsic::getDeclaration(M, llvm::Intrinsic::trap), "", BB);
+  llvm::ReturnInst::Create(Ctx, nullptr, BB);
+}
+
+// This function is basically a switch over the CFI failure kind, which is
+// extracted from CFICheckFailData (1st function argument). Each case is either
+// llvm.trap or a call to one of the two runtime handlers, based on
+// -fsanitize-trap and -fsanitize-recover settings.  Default case (invalid
+// failure kind) traps, but this should really never happen.  CFICheckFailData
+// can be nullptr if the calling module has -fsanitize-trap behavior for this
+// check kind; in this case __cfi_check_fail traps as well.
+void CodeGenFunction::EmitCfiCheckFail() {
+  SanitizerScope SanScope(this);
+  FunctionArgList Args;
+  ImplicitParamDecl ArgData(getContext(), getContext().VoidPtrTy,
+                            ImplicitParamDecl::Other);
+  ImplicitParamDecl ArgAddr(getContext(), getContext().VoidPtrTy,
+                            ImplicitParamDecl::Other);
+  Args.push_back(&ArgData);
+  Args.push_back(&ArgAddr);
+
+  const CGFunctionInfo &FI =
+    CGM.getTypes().arrangeBuiltinFunctionDeclaration(getContext().VoidTy, Args);
+
+  llvm::Function *F = llvm::Function::Create(
+      llvm::FunctionType::get(VoidTy, {VoidPtrTy, VoidPtrTy}, false),
+      llvm::GlobalValue::WeakODRLinkage, "__cfi_check_fail", &CGM.getModule());
+
+  CGM.SetLLVMFunctionAttributes(GlobalDecl(), FI, F);
+  CGM.SetLLVMFunctionAttributesForDefinition(nullptr, F);
+  F->setVisibility(llvm::GlobalValue::HiddenVisibility);
+
+  StartFunction(GlobalDecl(), CGM.getContext().VoidTy, F, FI, Args,
+                SourceLocation());
+
+  // This function should not be affected by blacklist. This function does
+  // not have a source location, but "src:*" would still apply. Revert any
+  // changes to SanOpts made in StartFunction.
+  SanOpts = CGM.getLangOpts().Sanitize;
+
+  llvm::Value *Data =
+      EmitLoadOfScalar(GetAddrOfLocalVar(&ArgData), /*Volatile=*/false,
+                       CGM.getContext().VoidPtrTy, ArgData.getLocation());
+  llvm::Value *Addr =
+      EmitLoadOfScalar(GetAddrOfLocalVar(&ArgAddr), /*Volatile=*/false,
+                       CGM.getContext().VoidPtrTy, ArgAddr.getLocation());
+
+  // Data == nullptr means the calling module has trap behaviour for this check.
+  llvm::Value *DataIsNotNullPtr =
+      Builder.CreateICmpNE(Data, llvm::ConstantPointerNull::get(Int8PtrTy));
+  EmitTrapCheck(DataIsNotNullPtr);
+
+  llvm::StructType *SourceLocationTy =
+      llvm::StructType::get(VoidPtrTy, Int32Ty, Int32Ty);
+  llvm::StructType *CfiCheckFailDataTy =
+      llvm::StructType::get(Int8Ty, SourceLocationTy, VoidPtrTy);
+
+  llvm::Value *V = Builder.CreateConstGEP2_32(
+      CfiCheckFailDataTy,
+      Builder.CreatePointerCast(Data, CfiCheckFailDataTy->getPointerTo(0)), 0,
+      0);
+  Address CheckKindAddr(V, getIntAlign());
+  llvm::Value *CheckKind = Builder.CreateLoad(CheckKindAddr);
+
+  llvm::Value *AllVtables = llvm::MetadataAsValue::get(
+      CGM.getLLVMContext(),
+      llvm::MDString::get(CGM.getLLVMContext(), "all-vtables"));
+  llvm::Value *ValidVtable = Builder.CreateZExt(
+      Builder.CreateCall(CGM.getIntrinsic(llvm::Intrinsic::type_test),
+                         {Addr, AllVtables}),
+      IntPtrTy);
+
+  const std::pair<int, SanitizerMask> CheckKinds[] = {
+      {CFITCK_VCall, SanitizerKind::CFIVCall},
+      {CFITCK_NVCall, SanitizerKind::CFINVCall},
+      {CFITCK_DerivedCast, SanitizerKind::CFIDerivedCast},
+      {CFITCK_UnrelatedCast, SanitizerKind::CFIUnrelatedCast},
+      {CFITCK_ICall, SanitizerKind::CFIICall}};
+
+  SmallVector<std::pair<llvm::Value *, SanitizerMask>, 5> Checks;
+  for (auto CheckKindMaskPair : CheckKinds) {
+    int Kind = CheckKindMaskPair.first;
+    SanitizerMask Mask = CheckKindMaskPair.second;
+    llvm::Value *Cond =
+        Builder.CreateICmpNE(CheckKind, llvm::ConstantInt::get(Int8Ty, Kind));
+    if (CGM.getLangOpts().Sanitize.has(Mask))
+      EmitCheck(std::make_pair(Cond, Mask), SanitizerHandler::CFICheckFail, {},
+                {Data, Addr, ValidVtable});
+    else
+      EmitTrapCheck(Cond);
+  }
+
+  FinishFunction();
+  // The only reference to this function will be created during LTO link.
+  // Make sure it survives until then.
+  CGM.addUsedGlobal(F);
+}
+
+void CodeGenFunction::EmitUnreachable(SourceLocation Loc) {
+  if (SanOpts.has(SanitizerKind::Unreachable)) {
+    SanitizerScope SanScope(this);
+    EmitCheck(std::make_pair(static_cast<llvm::Value *>(Builder.getFalse()),
+                             SanitizerKind::Unreachable),
+              SanitizerHandler::BuiltinUnreachable,
+              EmitCheckSourceLocation(Loc), None);
+  }
+  Builder.CreateUnreachable();
+}
+
+void CodeGenFunction::EmitTrapCheck(llvm::Value *Checked) {
+  llvm::BasicBlock *Cont = createBasicBlock("cont");
+
+  // If we're optimizing, collapse all calls to trap down to just one per
+  // function to save on code size.
+  if (!CGM.getCodeGenOpts().OptimizationLevel || !TrapBB) {
+    TrapBB = createBasicBlock("trap");
+    Builder.CreateCondBr(Checked, Cont, TrapBB);
+    EmitBlock(TrapBB);
+    llvm::CallInst *TrapCall = EmitTrapCall(llvm::Intrinsic::trap);
+    TrapCall->setDoesNotReturn();
+    TrapCall->setDoesNotThrow();
+    Builder.CreateUnreachable();
+  } else {
+    Builder.CreateCondBr(Checked, Cont, TrapBB);
+  }
+
+  EmitBlock(Cont);
+}
+
+llvm::CallInst *CodeGenFunction::EmitTrapCall(llvm::Intrinsic::ID IntrID) {
+  llvm::CallInst *TrapCall = Builder.CreateCall(CGM.getIntrinsic(IntrID));
+
+  if (!CGM.getCodeGenOpts().TrapFuncName.empty()) {
+    auto A = llvm::Attribute::get(getLLVMContext(), "trap-func-name",
+                                  CGM.getCodeGenOpts().TrapFuncName);
+    TrapCall->addAttribute(llvm::AttributeList::FunctionIndex, A);
+  }
+
+  return TrapCall;
+}
+
+Address CodeGenFunction::EmitArrayToPointerDecay(const Expr *E,
+                                                 LValueBaseInfo *BaseInfo,
+                                                 TBAAAccessInfo *TBAAInfo) {
+  assert(E->getType()->isArrayType() &&
+         "Array to pointer decay must have array source type!");
+
+  // Expressions of array type can't be bitfields or vector elements.
+  LValue LV = EmitLValue(E);
+  Address Addr = LV.getAddress(*this);
+
+  // If the array type was an incomplete type, we need to make sure
+  // the decay ends up being the right type.
+  llvm::Type *NewTy = ConvertType(E->getType());
+  Addr = Builder.CreateElementBitCast(Addr, NewTy);
+
+  // Note that VLA pointers are always decayed, so we don't need to do
+  // anything here.
+  if (!E->getType()->isVariableArrayType()) {
+    assert(isa<llvm::ArrayType>(Addr.getElementType()) &&
+           "Expected pointer to array");
+    Addr = Builder.CreateConstArrayGEP(Addr, 0, "arraydecay");
+  }
+
+  // The result of this decay conversion points to an array element within the
+  // base lvalue. However, since TBAA currently does not support representing
+  // accesses to elements of member arrays, we conservatively represent accesses
+  // to the pointee object as if it had no any base lvalue specified.
+  // TODO: Support TBAA for member arrays.
+  QualType EltType = E->getType()->castAsArrayTypeUnsafe()->getElementType();
+  if (BaseInfo) *BaseInfo = LV.getBaseInfo();
+  if (TBAAInfo) *TBAAInfo = CGM.getTBAAAccessInfo(EltType);
+
+  return Builder.CreateElementBitCast(Addr, ConvertTypeForMem(EltType));
+}
+
+/// isSimpleArrayDecayOperand - If the specified expr is a simple decay from an
+/// array to pointer, return the array subexpression.
+static const Expr *isSimpleArrayDecayOperand(const Expr *E) {
+  // If this isn't just an array->pointer decay, bail out.
+  const auto *CE = dyn_cast<CastExpr>(E);
+  if (!CE || CE->getCastKind() != CK_ArrayToPointerDecay)
+    return nullptr;
+
+  // If this is a decay from variable width array, bail out.
+  const Expr *SubExpr = CE->getSubExpr();
+  if (SubExpr->getType()->isVariableArrayType())
+    return nullptr;
+
+  return SubExpr;
+}
+
+static llvm::Value *emitArraySubscriptGEP(CodeGenFunction &CGF,
+                                          llvm::Value *ptr,
+                                          ArrayRef<llvm::Value*> indices,
+                                          bool inbounds,
+                                          bool signedIndices,
+                                          SourceLocation loc,
+                                    const llvm::Twine &name = "arrayidx") {
+  if (inbounds) {
+    return CGF.EmitCheckedInBoundsGEP(ptr, indices, signedIndices,
+                                      CodeGenFunction::NotSubtraction, loc,
+                                      name);
+  } else {
+    return CGF.Builder.CreateGEP(ptr, indices, name);
+  }
+}
+
+static CharUnits getArrayElementAlign(CharUnits arrayAlign,
+                                      llvm::Value *idx,
+                                      CharUnits eltSize) {
+  // If we have a constant index, we can use the exact offset of the
+  // element we're accessing.
+  if (auto constantIdx = dyn_cast<llvm::ConstantInt>(idx)) {
+    CharUnits offset = constantIdx->getZExtValue() * eltSize;
+    return arrayAlign.alignmentAtOffset(offset);
+
+  // Otherwise, use the worst-case alignment for any element.
+  } else {
+    return arrayAlign.alignmentOfArrayElement(eltSize);
+  }
+}
+
+static QualType getFixedSizeElementType(const ASTContext &ctx,
+                                        const VariableArrayType *vla) {
+  QualType eltType;
+  do {
+    eltType = vla->getElementType();
+  } while ((vla = ctx.getAsVariableArrayType(eltType)));
+  return eltType;
+}
+
+/// Given an array base, check whether its member access belongs to a record
+/// with preserve_access_index attribute or not.
+static bool IsPreserveAIArrayBase(CodeGenFunction &CGF, const Expr *ArrayBase) {
+  if (!ArrayBase || !CGF.getDebugInfo())
+    return false;
+
+  // Only support base as either a MemberExpr or DeclRefExpr.
+  // DeclRefExpr to cover cases like:
+  //    struct s { int a; int b[10]; };
+  //    struct s *p;
+  //    p[1].a
+  // p[1] will generate a DeclRefExpr and p[1].a is a MemberExpr.
+  // p->b[5] is a MemberExpr example.
+  const Expr *E = ArrayBase->IgnoreImpCasts();
+  if (const auto *ME = dyn_cast<MemberExpr>(E))
+    return ME->getMemberDecl()->hasAttr<BPFPreserveAccessIndexAttr>();
+
+  if (const auto *DRE = dyn_cast<DeclRefExpr>(E)) {
+    const auto *VarDef = dyn_cast<VarDecl>(DRE->getDecl());
+    if (!VarDef)
+      return false;
+
+    const auto *PtrT = VarDef->getType()->getAs<PointerType>();
+    if (!PtrT)
+      return false;
+
+    const auto *PointeeT = PtrT->getPointeeType()
+                             ->getUnqualifiedDesugaredType();
+    if (const auto *RecT = dyn_cast<RecordType>(PointeeT))
+      return RecT->getDecl()->hasAttr<BPFPreserveAccessIndexAttr>();
+    return false;
+  }
+
+  return false;
+}
+
+static Address emitArraySubscriptGEP(CodeGenFunction &CGF, Address addr,
+                                     ArrayRef<llvm::Value *> indices,
+                                     QualType eltType, bool inbounds,
+                                     bool signedIndices, SourceLocation loc,
+                                     QualType *arrayType = nullptr,
+                                     const Expr *Base = nullptr,
+                                     const llvm::Twine &name = "arrayidx") {
+  // All the indices except that last must be zero.
+#ifndef NDEBUG
+  for (auto idx : indices.drop_back())
+    assert(isa<llvm::ConstantInt>(idx) &&
+           cast<llvm::ConstantInt>(idx)->isZero());
+#endif
+
+  // Determine the element size of the statically-sized base.  This is
+  // the thing that the indices are expressed in terms of.
+  if (auto vla = CGF.getContext().getAsVariableArrayType(eltType)) {
+    eltType = getFixedSizeElementType(CGF.getContext(), vla);
+  }
+
+  // We can use that to compute the best alignment of the element.
+  CharUnits eltSize = CGF.getContext().getTypeSizeInChars(eltType);
+  CharUnits eltAlign =
+    getArrayElementAlign(addr.getAlignment(), indices.back(), eltSize);
+
+  llvm::Value *eltPtr;
+  auto LastIndex = dyn_cast<llvm::ConstantInt>(indices.back());
+  if (!LastIndex ||
+      (!CGF.IsInPreservedAIRegion && !IsPreserveAIArrayBase(CGF, Base))) {
+    eltPtr = emitArraySubscriptGEP(
+        CGF, addr.getPointer(), indices, inbounds, signedIndices,
+        loc, name);
+  } else {
+    // Remember the original array subscript for bpf target
+    unsigned idx = LastIndex->getZExtValue();
+    llvm::DIType *DbgInfo = nullptr;
+    if (arrayType)
+      DbgInfo = CGF.getDebugInfo()->getOrCreateStandaloneType(*arrayType, loc);
+    eltPtr = CGF.Builder.CreatePreserveArrayAccessIndex(addr.getElementType(),
+                                                        addr.getPointer(),
+                                                        indices.size() - 1,
+                                                        idx, DbgInfo);
+  }
+
+  return Address(eltPtr, eltAlign);
+}
+
+LValue CodeGenFunction::EmitArraySubscriptExpr(const ArraySubscriptExpr *E,
+                                               bool Accessed) {
+  // The index must always be an integer, which is not an aggregate.  Emit it
+  // in lexical order (this complexity is, sadly, required by C++17).
+  llvm::Value *IdxPre =
+      (E->getLHS() == E->getIdx()) ? EmitScalarExpr(E->getIdx()) : nullptr;
+  bool SignedIndices = false;
+  auto EmitIdxAfterBase = [&, IdxPre](bool Promote) -> llvm::Value * {
+    auto *Idx = IdxPre;
+    if (E->getLHS() != E->getIdx()) {
+      assert(E->getRHS() == E->getIdx() && "index was neither LHS nor RHS");
+      Idx = EmitScalarExpr(E->getIdx());
+    }
+
+    QualType IdxTy = E->getIdx()->getType();
+    bool IdxSigned = IdxTy->isSignedIntegerOrEnumerationType();
+    SignedIndices |= IdxSigned;
+
+    if (SanOpts.has(SanitizerKind::ArrayBounds))
+      EmitBoundsCheck(E, E->getBase(), Idx, IdxTy, Accessed);
+
+    // Extend or truncate the index type to 32 or 64-bits.
+    if (Promote && Idx->getType() != IntPtrTy)
+      Idx = Builder.CreateIntCast(Idx, IntPtrTy, IdxSigned, "idxprom");
+
+    return Idx;
+  };
+  IdxPre = nullptr;
+
+  // If the base is a vector type, then we are forming a vector element lvalue
+  // with this subscript.
+  if (E->getBase()->getType()->isVectorType() &&
+      !isa<ExtVectorElementExpr>(E->getBase())) {
+    // Emit the vector as an lvalue to get its address.
+    LValue LHS = EmitLValue(E->getBase());
+    auto *Idx = EmitIdxAfterBase(/*Promote*/false);
+    assert(LHS.isSimple() && "Can only subscript lvalue vectors here!");
+    return LValue::MakeVectorElt(LHS.getAddress(*this), Idx,
+                                 E->getBase()->getType(), LHS.getBaseInfo(),
+                                 TBAAAccessInfo());
+  }
+
+  // All the other cases basically behave like simple offsetting.
+
+  // Handle the extvector case we ignored above.
+  if (isa<ExtVectorElementExpr>(E->getBase())) {
+    LValue LV = EmitLValue(E->getBase());
+    auto *Idx = EmitIdxAfterBase(/*Promote*/true);
+    Address Addr = EmitExtVectorElementLValue(LV);
+
+    QualType EltType = LV.getType()->castAs<VectorType>()->getElementType();
+    Addr = emitArraySubscriptGEP(*this, Addr, Idx, EltType, /*inbounds*/ true,
+                                 SignedIndices, E->getExprLoc());
+    return MakeAddrLValue(Addr, EltType, LV.getBaseInfo(),
+                          CGM.getTBAAInfoForSubobject(LV, EltType));
+  }
+
+  LValueBaseInfo EltBaseInfo;
+  TBAAAccessInfo EltTBAAInfo;
+  Address Addr = Address::invalid();
+  if (const VariableArrayType *vla =
+           getContext().getAsVariableArrayType(E->getType())) {
+    // The base must be a pointer, which is not an aggregate.  Emit
+    // it.  It needs to be emitted first in case it's what captures
+    // the VLA bounds.
+    Addr = EmitPointerWithAlignment(E->getBase(), &EltBaseInfo, &EltTBAAInfo);
+    auto *Idx = EmitIdxAfterBase(/*Promote*/true);
+
+    // The element count here is the total number of non-VLA elements.
+    llvm::Value *numElements = getVLASize(vla).NumElts;
+
+    // Effectively, the multiply by the VLA size is part of the GEP.
+    // GEP indexes are signed, and scaling an index isn't permitted to
+    // signed-overflow, so we use the same semantics for our explicit
+    // multiply.  We suppress this if overflow is not undefined behavior.
+    if (getLangOpts().isSignedOverflowDefined()) {
+      Idx = Builder.CreateMul(Idx, numElements);
+    } else {
+      Idx = Builder.CreateNSWMul(Idx, numElements);
+    }
+
+    Addr = emitArraySubscriptGEP(*this, Addr, Idx, vla->getElementType(),
+                                 !getLangOpts().isSignedOverflowDefined(),
+                                 SignedIndices, E->getExprLoc());
+
+  } else if (const ObjCObjectType *OIT = E->getType()->getAs<ObjCObjectType>()){
+    // Indexing over an interface, as in "NSString *P; P[4];"
+
+    // Emit the base pointer.
+    Addr = EmitPointerWithAlignment(E->getBase(), &EltBaseInfo, &EltTBAAInfo);
+    auto *Idx = EmitIdxAfterBase(/*Promote*/true);
+
+    CharUnits InterfaceSize = getContext().getTypeSizeInChars(OIT);
+    llvm::Value *InterfaceSizeVal =
+        llvm::ConstantInt::get(Idx->getType(), InterfaceSize.getQuantity());
+
+    llvm::Value *ScaledIdx = Builder.CreateMul(Idx, InterfaceSizeVal);
+
+    // We don't necessarily build correct LLVM struct types for ObjC
+    // interfaces, so we can't rely on GEP to do this scaling
+    // correctly, so we need to cast to i8*.  FIXME: is this actually
+    // true?  A lot of other things in the fragile ABI would break...
+    llvm::Type *OrigBaseTy = Addr.getType();
+    Addr = Builder.CreateElementBitCast(Addr, Int8Ty);
+
+    // Do the GEP.
+    CharUnits EltAlign =
+      getArrayElementAlign(Addr.getAlignment(), Idx, InterfaceSize);
+    llvm::Value *EltPtr =
+        emitArraySubscriptGEP(*this, Addr.getPointer(), ScaledIdx, false,
+                              SignedIndices, E->getExprLoc());
+    Addr = Address(EltPtr, EltAlign);
+
+    // Cast back.
+    Addr = Builder.CreateBitCast(Addr, OrigBaseTy);
+  } else if (const Expr *Array = isSimpleArrayDecayOperand(E->getBase())) {
+    // If this is A[i] where A is an array, the frontend will have decayed the
+    // base to be a ArrayToPointerDecay implicit cast.  While correct, it is
+    // inefficient at -O0 to emit a "gep A, 0, 0" when codegen'ing it, then a
+    // "gep x, i" here.  Emit one "gep A, 0, i".
+    assert(Array->getType()->isArrayType() &&
+           "Array to pointer decay must have array source type!");
+    LValue ArrayLV;
+    // For simple multidimensional array indexing, set the 'accessed' flag for
+    // better bounds-checking of the base expression.
+    if (const auto *ASE = dyn_cast<ArraySubscriptExpr>(Array))
+      ArrayLV = EmitArraySubscriptExpr(ASE, /*Accessed*/ true);
+    else
+      ArrayLV = EmitLValue(Array);
+    auto *Idx = EmitIdxAfterBase(/*Promote*/true);
+
+    // Propagate the alignment from the array itself to the result.
+    QualType arrayType = Array->getType();
+    Addr = emitArraySubscriptGEP(
+        *this, ArrayLV.getAddress(*this), {CGM.getSize(CharUnits::Zero()), Idx},
+        E->getType(), !getLangOpts().isSignedOverflowDefined(), SignedIndices,
+        E->getExprLoc(), &arrayType, E->getBase());
+    EltBaseInfo = ArrayLV.getBaseInfo();
+    EltTBAAInfo = CGM.getTBAAInfoForSubobject(ArrayLV, E->getType());
+  } else {
+    // The base must be a pointer; emit it with an estimate of its alignment.
+    Addr = EmitPointerWithAlignment(E->getBase(), &EltBaseInfo, &EltTBAAInfo);
+    auto *Idx = EmitIdxAfterBase(/*Promote*/true);
+    QualType ptrType = E->getBase()->getType();
+    Addr = emitArraySubscriptGEP(*this, Addr, Idx, E->getType(),
+                                 !getLangOpts().isSignedOverflowDefined(),
+                                 SignedIndices, E->getExprLoc(), &ptrType,
+                                 E->getBase());
+  }
+
+  LValue LV = MakeAddrLValue(Addr, E->getType(), EltBaseInfo, EltTBAAInfo);
+
+  if (getLangOpts().ObjC &&
+      getLangOpts().getGC() != LangOptions::NonGC) {
+    LV.setNonGC(!E->isOBJCGCCandidate(getContext()));
+    setObjCGCLValueClass(getContext(), E, LV);
+  }
+  return LV;
+}
+
+static Address emitOMPArraySectionBase(CodeGenFunction &CGF, const Expr *Base,
+                                       LValueBaseInfo &BaseInfo,
+                                       TBAAAccessInfo &TBAAInfo,
+                                       QualType BaseTy, QualType ElTy,
+                                       bool IsLowerBound) {
+  LValue BaseLVal;
+  if (auto *ASE = dyn_cast<OMPArraySectionExpr>(Base->IgnoreParenImpCasts())) {
+    BaseLVal = CGF.EmitOMPArraySectionExpr(ASE, IsLowerBound);
+    if (BaseTy->isArrayType()) {
+      Address Addr = BaseLVal.getAddress(CGF);
+      BaseInfo = BaseLVal.getBaseInfo();
+
+      // If the array type was an incomplete type, we need to make sure
+      // the decay ends up being the right type.
+      llvm::Type *NewTy = CGF.ConvertType(BaseTy);
+      Addr = CGF.Builder.CreateElementBitCast(Addr, NewTy);
+
+      // Note that VLA pointers are always decayed, so we don't need to do
+      // anything here.
+      if (!BaseTy->isVariableArrayType()) {
+        assert(isa<llvm::ArrayType>(Addr.getElementType()) &&
+               "Expected pointer to array");
+        Addr = CGF.Builder.CreateConstArrayGEP(Addr, 0, "arraydecay");
+      }
+
+      return CGF.Builder.CreateElementBitCast(Addr,
+                                              CGF.ConvertTypeForMem(ElTy));
+    }
+    LValueBaseInfo TypeBaseInfo;
+    TBAAAccessInfo TypeTBAAInfo;
+    CharUnits Align = CGF.getNaturalTypeAlignment(ElTy, &TypeBaseInfo,
+                                                  &TypeTBAAInfo);
+    BaseInfo.mergeForCast(TypeBaseInfo);
+    TBAAInfo = CGF.CGM.mergeTBAAInfoForCast(TBAAInfo, TypeTBAAInfo);
+    return Address(CGF.Builder.CreateLoad(BaseLVal.getAddress(CGF)), Align);
+  }
+  return CGF.EmitPointerWithAlignment(Base, &BaseInfo, &TBAAInfo);
+}
+
+LValue CodeGenFunction::EmitOMPArraySectionExpr(const OMPArraySectionExpr *E,
+                                                bool IsLowerBound) {
+  QualType BaseTy = OMPArraySectionExpr::getBaseOriginalType(E->getBase());
+  QualType ResultExprTy;
+  if (auto *AT = getContext().getAsArrayType(BaseTy))
+    ResultExprTy = AT->getElementType();
+  else
+    ResultExprTy = BaseTy->getPointeeType();
+  llvm::Value *Idx = nullptr;
+  if (IsLowerBound || E->getColonLoc().isInvalid()) {
+    // Requesting lower bound or upper bound, but without provided length and
+    // without ':' symbol for the default length -> length = 1.
+    // Idx = LowerBound ?: 0;
+    if (auto *LowerBound = E->getLowerBound()) {
+      Idx = Builder.CreateIntCast(
+          EmitScalarExpr(LowerBound), IntPtrTy,
+          LowerBound->getType()->hasSignedIntegerRepresentation());
+    } else
+      Idx = llvm::ConstantInt::getNullValue(IntPtrTy);
+  } else {
+    // Try to emit length or lower bound as constant. If this is possible, 1
+    // is subtracted from constant length or lower bound. Otherwise, emit LLVM
+    // IR (LB + Len) - 1.
+    auto &C = CGM.getContext();
+    auto *Length = E->getLength();
+    llvm::APSInt ConstLength;
+    if (Length) {
+      // Idx = LowerBound + Length - 1;
+      if (Length->isIntegerConstantExpr(ConstLength, C)) {
+        ConstLength = ConstLength.zextOrTrunc(PointerWidthInBits);
+        Length = nullptr;
+      }
+      auto *LowerBound = E->getLowerBound();
+      llvm::APSInt ConstLowerBound(PointerWidthInBits, /*isUnsigned=*/false);
+      if (LowerBound && LowerBound->isIntegerConstantExpr(ConstLowerBound, C)) {
+        ConstLowerBound = ConstLowerBound.zextOrTrunc(PointerWidthInBits);
+        LowerBound = nullptr;
+      }
+      if (!Length)
+        --ConstLength;
+      else if (!LowerBound)
+        --ConstLowerBound;
+
+      if (Length || LowerBound) {
+        auto *LowerBoundVal =
+            LowerBound
+                ? Builder.CreateIntCast(
+                      EmitScalarExpr(LowerBound), IntPtrTy,
+                      LowerBound->getType()->hasSignedIntegerRepresentation())
+                : llvm::ConstantInt::get(IntPtrTy, ConstLowerBound);
+        auto *LengthVal =
+            Length
+                ? Builder.CreateIntCast(
+                      EmitScalarExpr(Length), IntPtrTy,
+                      Length->getType()->hasSignedIntegerRepresentation())
+                : llvm::ConstantInt::get(IntPtrTy, ConstLength);
+        Idx = Builder.CreateAdd(LowerBoundVal, LengthVal, "lb_add_len",
+                                /*HasNUW=*/false,
+                                !getLangOpts().isSignedOverflowDefined());
+        if (Length && LowerBound) {
+          Idx = Builder.CreateSub(
+              Idx, llvm::ConstantInt::get(IntPtrTy, /*V=*/1), "idx_sub_1",
+              /*HasNUW=*/false, !getLangOpts().isSignedOverflowDefined());
+        }
+      } else
+        Idx = llvm::ConstantInt::get(IntPtrTy, ConstLength + ConstLowerBound);
+    } else {
+      // Idx = ArraySize - 1;
+      QualType ArrayTy = BaseTy->isPointerType()
+                             ? E->getBase()->IgnoreParenImpCasts()->getType()
+                             : BaseTy;
+      if (auto *VAT = C.getAsVariableArrayType(ArrayTy)) {
+        Length = VAT->getSizeExpr();
+        if (Length->isIntegerConstantExpr(ConstLength, C))
+          Length = nullptr;
+      } else {
+        auto *CAT = C.getAsConstantArrayType(ArrayTy);
+        ConstLength = CAT->getSize();
+      }
+      if (Length) {
+        auto *LengthVal = Builder.CreateIntCast(
+            EmitScalarExpr(Length), IntPtrTy,
+            Length->getType()->hasSignedIntegerRepresentation());
+        Idx = Builder.CreateSub(
+            LengthVal, llvm::ConstantInt::get(IntPtrTy, /*V=*/1), "len_sub_1",
+            /*HasNUW=*/false, !getLangOpts().isSignedOverflowDefined());
+      } else {
+        ConstLength = ConstLength.zextOrTrunc(PointerWidthInBits);
+        --ConstLength;
+        Idx = llvm::ConstantInt::get(IntPtrTy, ConstLength);
+      }
+    }
+  }
+  assert(Idx);
+
+  Address EltPtr = Address::invalid();
+  LValueBaseInfo BaseInfo;
+  TBAAAccessInfo TBAAInfo;
+  if (auto *VLA = getContext().getAsVariableArrayType(ResultExprTy)) {
+    // The base must be a pointer, which is not an aggregate.  Emit
+    // it.  It needs to be emitted first in case it's what captures
+    // the VLA bounds.
+    Address Base =
+        emitOMPArraySectionBase(*this, E->getBase(), BaseInfo, TBAAInfo,
+                                BaseTy, VLA->getElementType(), IsLowerBound);
+    // The element count here is the total number of non-VLA elements.
+    llvm::Value *NumElements = getVLASize(VLA).NumElts;
+
+    // Effectively, the multiply by the VLA size is part of the GEP.
+    // GEP indexes are signed, and scaling an index isn't permitted to
+    // signed-overflow, so we use the same semantics for our explicit
+    // multiply.  We suppress this if overflow is not undefined behavior.
+    if (getLangOpts().isSignedOverflowDefined())
+      Idx = Builder.CreateMul(Idx, NumElements);
+    else
+      Idx = Builder.CreateNSWMul(Idx, NumElements);
+    EltPtr = emitArraySubscriptGEP(*this, Base, Idx, VLA->getElementType(),
+                                   !getLangOpts().isSignedOverflowDefined(),
+                                   /*signedIndices=*/false, E->getExprLoc());
+  } else if (const Expr *Array = isSimpleArrayDecayOperand(E->getBase())) {
+    // If this is A[i] where A is an array, the frontend will have decayed the
+    // base to be a ArrayToPointerDecay implicit cast.  While correct, it is
+    // inefficient at -O0 to emit a "gep A, 0, 0" when codegen'ing it, then a
+    // "gep x, i" here.  Emit one "gep A, 0, i".
+    assert(Array->getType()->isArrayType() &&
+           "Array to pointer decay must have array source type!");
+    LValue ArrayLV;
+    // For simple multidimensional array indexing, set the 'accessed' flag for
+    // better bounds-checking of the base expression.
+    if (const auto *ASE = dyn_cast<ArraySubscriptExpr>(Array))
+      ArrayLV = EmitArraySubscriptExpr(ASE, /*Accessed*/ true);
+    else
+      ArrayLV = EmitLValue(Array);
+
+    // Propagate the alignment from the array itself to the result.
+    EltPtr = emitArraySubscriptGEP(
+        *this, ArrayLV.getAddress(*this), {CGM.getSize(CharUnits::Zero()), Idx},
+        ResultExprTy, !getLangOpts().isSignedOverflowDefined(),
+        /*signedIndices=*/false, E->getExprLoc());
+    BaseInfo = ArrayLV.getBaseInfo();
+    TBAAInfo = CGM.getTBAAInfoForSubobject(ArrayLV, ResultExprTy);
+  } else {
+    Address Base = emitOMPArraySectionBase(*this, E->getBase(), BaseInfo,
+                                           TBAAInfo, BaseTy, ResultExprTy,
+                                           IsLowerBound);
+    EltPtr = emitArraySubscriptGEP(*this, Base, Idx, ResultExprTy,
+                                   !getLangOpts().isSignedOverflowDefined(),
+                                   /*signedIndices=*/false, E->getExprLoc());
+  }
+
+  return MakeAddrLValue(EltPtr, ResultExprTy, BaseInfo, TBAAInfo);
+}
+
+LValue CodeGenFunction::
+EmitExtVectorElementExpr(const ExtVectorElementExpr *E) {
+  // Emit the base vector as an l-value.
+  LValue Base;
+
+  // ExtVectorElementExpr's base can either be a vector or pointer to vector.
+  if (E->isArrow()) {
+    // If it is a pointer to a vector, emit the address and form an lvalue with
+    // it.
+    LValueBaseInfo BaseInfo;
+    TBAAAccessInfo TBAAInfo;
+    Address Ptr = EmitPointerWithAlignment(E->getBase(), &BaseInfo, &TBAAInfo);
+    const auto *PT = E->getBase()->getType()->castAs<PointerType>();
+    Base = MakeAddrLValue(Ptr, PT->getPointeeType(), BaseInfo, TBAAInfo);
+    Base.getQuals().removeObjCGCAttr();
+  } else if (E->getBase()->isGLValue()) {
+    // Otherwise, if the base is an lvalue ( as in the case of foo.x.x),
+    // emit the base as an lvalue.
+    assert(E->getBase()->getType()->isVectorType());
+    Base = EmitLValue(E->getBase());
+  } else {
+    // Otherwise, the base is a normal rvalue (as in (V+V).x), emit it as such.
+    assert(E->getBase()->getType()->isVectorType() &&
+           "Result must be a vector");
+    llvm::Value *Vec = EmitScalarExpr(E->getBase());
+
+    // Store the vector to memory (because LValue wants an address).
+    Address VecMem = CreateMemTemp(E->getBase()->getType());
+    Builder.CreateStore(Vec, VecMem);
+    Base = MakeAddrLValue(VecMem, E->getBase()->getType(),
+                          AlignmentSource::Decl);
+  }
+
+  QualType type =
+    E->getType().withCVRQualifiers(Base.getQuals().getCVRQualifiers());
+
+  // Encode the element access list into a vector of unsigned indices.
+  SmallVector<uint32_t, 4> Indices;
+  E->getEncodedElementAccess(Indices);
+
+  if (Base.isSimple()) {
+    llvm::Constant *CV =
+        llvm::ConstantDataVector::get(getLLVMContext(), Indices);
+    return LValue::MakeExtVectorElt(Base.getAddress(*this), CV, type,
+                                    Base.getBaseInfo(), TBAAAccessInfo());
+  }
+  assert(Base.isExtVectorElt() && "Can only subscript lvalue vec elts here!");
+
+  llvm::Constant *BaseElts = Base.getExtVectorElts();
+  SmallVector<llvm::Constant *, 4> CElts;
+
+  for (unsigned i = 0, e = Indices.size(); i != e; ++i)
+    CElts.push_back(BaseElts->getAggregateElement(Indices[i]));
+  llvm::Constant *CV = llvm::ConstantVector::get(CElts);
+  return LValue::MakeExtVectorElt(Base.getExtVectorAddress(), CV, type,
+                                  Base.getBaseInfo(), TBAAAccessInfo());
+}
+
+LValue CodeGenFunction::EmitMemberExpr(const MemberExpr *E) {
+  if (DeclRefExpr *DRE = tryToConvertMemberExprToDeclRefExpr(*this, E)) {
+    EmitIgnoredExpr(E->getBase());
+    return EmitDeclRefLValue(DRE);
+  }
+
+  Expr *BaseExpr = E->getBase();
+  // If this is s.x, emit s as an lvalue.  If it is s->x, emit s as a scalar.
+  LValue BaseLV;
+  if (E->isArrow()) {
+    LValueBaseInfo BaseInfo;
+    TBAAAccessInfo TBAAInfo;
+    Address Addr = EmitPointerWithAlignment(BaseExpr, &BaseInfo, &TBAAInfo);
+    QualType PtrTy = BaseExpr->getType()->getPointeeType();
+    SanitizerSet SkippedChecks;
+    bool IsBaseCXXThis = IsWrappedCXXThis(BaseExpr);
+    if (IsBaseCXXThis)
+      SkippedChecks.set(SanitizerKind::Alignment, true);
+    if (IsBaseCXXThis || isa<DeclRefExpr>(BaseExpr))
+      SkippedChecks.set(SanitizerKind::Null, true);
+    EmitTypeCheck(TCK_MemberAccess, E->getExprLoc(), Addr.getPointer(), PtrTy,
+                  /*Alignment=*/CharUnits::Zero(), SkippedChecks);
+    BaseLV = MakeAddrLValue(Addr, PtrTy, BaseInfo, TBAAInfo);
+  } else
+    BaseLV = EmitCheckedLValue(BaseExpr, TCK_MemberAccess);
+
+  NamedDecl *ND = E->getMemberDecl();
+  if (auto *Field = dyn_cast<FieldDecl>(ND)) {
+    LValue LV = EmitLValueForField(BaseLV, Field);
+    setObjCGCLValueClass(getContext(), E, LV);
+    if (getLangOpts().OpenMP) {
+      // If the member was explicitly marked as nontemporal, mark it as
+      // nontemporal. If the base lvalue is marked as nontemporal, mark access
+      // to children as nontemporal too.
+      if ((IsWrappedCXXThis(BaseExpr) &&
+           CGM.getOpenMPRuntime().isNontemporalDecl(Field)) ||
+          BaseLV.isNontemporal())
+        LV.setNontemporal(/*Value=*/true);
+    }
+    return LV;
+  }
+
+  if (const auto *FD = dyn_cast<FunctionDecl>(ND))
+    return EmitFunctionDeclLValue(*this, E, FD);
+
+  llvm_unreachable("Unhandled member declaration!");
+}
+
+/// Given that we are currently emitting a lambda, emit an l-value for
+/// one of its members.
+LValue CodeGenFunction::EmitLValueForLambdaField(const FieldDecl *Field) {
+  assert(cast<CXXMethodDecl>(CurCodeDecl)->getParent()->isLambda());
+  assert(cast<CXXMethodDecl>(CurCodeDecl)->getParent() == Field->getParent());
+  QualType LambdaTagType =
+    getContext().getTagDeclType(Field->getParent());
+  LValue LambdaLV = MakeNaturalAlignAddrLValue(CXXABIThisValue, LambdaTagType);
+  return EmitLValueForField(LambdaLV, Field);
+}
+
+/// Get the field index in the debug info. The debug info structure/union
+/// will ignore the unnamed bitfields.
+unsigned CodeGenFunction::getDebugInfoFIndex(const RecordDecl *Rec,
+                                             unsigned FieldIndex) {
+  unsigned I = 0, Skipped = 0;
+
+  for (auto F : Rec->getDefinition()->fields()) {
+    if (I == FieldIndex)
+      break;
+    if (F->isUnnamedBitfield())
+      Skipped++;
+    I++;
+  }
+
+  return FieldIndex - Skipped;
+}
+
+/// Get the address of a zero-sized field within a record. The resulting
+/// address doesn't necessarily have the right type.
+static Address emitAddrOfZeroSizeField(CodeGenFunction &CGF, Address Base,
+                                       const FieldDecl *Field) {
+  CharUnits Offset = CGF.getContext().toCharUnitsFromBits(
+      CGF.getContext().getFieldOffset(Field));
+  if (Offset.isZero())
+    return Base;
+  Base = CGF.Builder.CreateElementBitCast(Base, CGF.Int8Ty);
+  return CGF.Builder.CreateConstInBoundsByteGEP(Base, Offset);
+}
+
+/// Drill down to the storage of a field without walking into
+/// reference types.
+///
+/// The resulting address doesn't necessarily have the right type.
+static Address emitAddrOfFieldStorage(CodeGenFunction &CGF, Address base,
+                                      const FieldDecl *field) {
+  if (field->isZeroSize(CGF.getContext()))
+    return emitAddrOfZeroSizeField(CGF, base, field);
+
+  const RecordDecl *rec = field->getParent();
+
+  unsigned idx =
+    CGF.CGM.getTypes().getCGRecordLayout(rec).getLLVMFieldNo(field);
+
+  return CGF.Builder.CreateStructGEP(base, idx, field->getName());
+}
+
+static Address emitPreserveStructAccess(CodeGenFunction &CGF, Address base,
+                                        const FieldDecl *field) {
+  const RecordDecl *rec = field->getParent();
+  llvm::DIType *DbgInfo = CGF.getDebugInfo()->getOrCreateRecordType(
+      CGF.getContext().getRecordType(rec), rec->getLocation());
+
+  unsigned idx =
+      CGF.CGM.getTypes().getCGRecordLayout(rec).getLLVMFieldNo(field);
+
+  return CGF.Builder.CreatePreserveStructAccessIndex(
+      base, idx, CGF.getDebugInfoFIndex(rec, field->getFieldIndex()), DbgInfo);
+}
+
+static bool hasAnyVptr(const QualType Type, const ASTContext &Context) {
+  const auto *RD = Type.getTypePtr()->getAsCXXRecordDecl();
+  if (!RD)
+    return false;
+
+  if (RD->isDynamicClass())
+    return true;
+
+  for (const auto &Base : RD->bases())
+    if (hasAnyVptr(Base.getType(), Context))
+      return true;
+
+  for (const FieldDecl *Field : RD->fields())
+    if (hasAnyVptr(Field->getType(), Context))
+      return true;
+
+  return false;
+}
+
+LValue CodeGenFunction::EmitLValueForField(LValue base,
+                                           const FieldDecl *field) {
+  LValueBaseInfo BaseInfo = base.getBaseInfo();
+
+  if (field->isBitField()) {
+    const CGRecordLayout &RL =
+      CGM.getTypes().getCGRecordLayout(field->getParent());
+    const CGBitFieldInfo &Info = RL.getBitFieldInfo(field);
+    Address Addr = base.getAddress(*this);
+    unsigned Idx = RL.getLLVMFieldNo(field);
+    const RecordDecl *rec = field->getParent();
+    if (!IsInPreservedAIRegion &&
+        (!getDebugInfo() || !rec->hasAttr<BPFPreserveAccessIndexAttr>())) {
+      if (Idx != 0)
+        // For structs, we GEP to the field that the record layout suggests.
+        Addr = Builder.CreateStructGEP(Addr, Idx, field->getName());
+    } else {
+      llvm::DIType *DbgInfo = getDebugInfo()->getOrCreateRecordType(
+          getContext().getRecordType(rec), rec->getLocation());
+      Addr = Builder.CreatePreserveStructAccessIndex(Addr, Idx,
+          getDebugInfoFIndex(rec, field->getFieldIndex()),
+          DbgInfo);
+    }
+
+    // Get the access type.
+    llvm::Type *FieldIntTy =
+      llvm::Type::getIntNTy(getLLVMContext(), Info.StorageSize);
+    if (Addr.getElementType() != FieldIntTy)
+      Addr = Builder.CreateElementBitCast(Addr, FieldIntTy);
+
+    QualType fieldType =
+      field->getType().withCVRQualifiers(base.getVRQualifiers());
+    // TODO: Support TBAA for bit fields.
+    LValueBaseInfo FieldBaseInfo(BaseInfo.getAlignmentSource());
+    return LValue::MakeBitfield(Addr, Info, fieldType, FieldBaseInfo,
+                                TBAAAccessInfo());
+  }
+
+  // Fields of may-alias structures are may-alias themselves.
+  // FIXME: this should get propagated down through anonymous structs
+  // and unions.
+  QualType FieldType = field->getType();
+  const RecordDecl *rec = field->getParent();
+  AlignmentSource BaseAlignSource = BaseInfo.getAlignmentSource();
+  LValueBaseInfo FieldBaseInfo(getFieldAlignmentSource(BaseAlignSource));
+  TBAAAccessInfo FieldTBAAInfo;
+  if (base.getTBAAInfo().isMayAlias() ||
+          rec->hasAttr<MayAliasAttr>() || FieldType->isVectorType()) {
+    FieldTBAAInfo = TBAAAccessInfo::getMayAliasInfo();
+  } else if (rec->isUnion()) {
+    // TODO: Support TBAA for unions.
+    FieldTBAAInfo = TBAAAccessInfo::getMayAliasInfo();
+  } else {
+    // If no base type been assigned for the base access, then try to generate
+    // one for this base lvalue.
+    FieldTBAAInfo = base.getTBAAInfo();
+    if (!FieldTBAAInfo.BaseType) {
+        FieldTBAAInfo.BaseType = CGM.getTBAABaseTypeInfo(base.getType());
+        assert(!FieldTBAAInfo.Offset &&
+               "Nonzero offset for an access with no base type!");
+    }
+
+    // Adjust offset to be relative to the base type.
+    const ASTRecordLayout &Layout =
+        getContext().getASTRecordLayout(field->getParent());
+    unsigned CharWidth = getContext().getCharWidth();
+    if (FieldTBAAInfo.BaseType)
+      FieldTBAAInfo.Offset +=
+          Layout.getFieldOffset(field->getFieldIndex()) / CharWidth;
+
+    // Update the final access type and size.
+    FieldTBAAInfo.AccessType = CGM.getTBAATypeInfo(FieldType);
+    FieldTBAAInfo.Size =
+        getContext().getTypeSizeInChars(FieldType).getQuantity();
+  }
+
+  Address addr = base.getAddress(*this);
+  if (auto *ClassDef = dyn_cast<CXXRecordDecl>(rec)) {
+    if (CGM.getCodeGenOpts().StrictVTablePointers &&
+        ClassDef->isDynamicClass()) {
+      // Getting to any field of dynamic object requires stripping dynamic
+      // information provided by invariant.group.  This is because accessing
+      // fields may leak the real address of dynamic object, which could result
+      // in miscompilation when leaked pointer would be compared.
+      auto *stripped = Builder.CreateStripInvariantGroup(addr.getPointer());
+      addr = Address(stripped, addr.getAlignment());
+    }
+  }
+
+  unsigned RecordCVR = base.getVRQualifiers();
+  if (rec->isUnion()) {
+    // For unions, there is no pointer adjustment.
+    if (CGM.getCodeGenOpts().StrictVTablePointers &&
+        hasAnyVptr(FieldType, getContext()))
+      // Because unions can easily skip invariant.barriers, we need to add
+      // a barrier every time CXXRecord field with vptr is referenced.
+      addr = Address(Builder.CreateLaunderInvariantGroup(addr.getPointer()),
+                     addr.getAlignment());
+
+    if (IsInPreservedAIRegion ||
+        (getDebugInfo() && rec->hasAttr<BPFPreserveAccessIndexAttr>())) {
+      // Remember the original union field index
+      llvm::DIType *DbgInfo = getDebugInfo()->getOrCreateRecordType(
+          getContext().getRecordType(rec), rec->getLocation());
+      addr = Address(
+          Builder.CreatePreserveUnionAccessIndex(
+              addr.getPointer(), getDebugInfoFIndex(rec, field->getFieldIndex()), DbgInfo),
+          addr.getAlignment());
+    }
+
+    if (FieldType->isReferenceType())
+      addr = Builder.CreateElementBitCast(
+          addr, CGM.getTypes().ConvertTypeForMem(FieldType), field->getName());
+  } else {
+    if (!IsInPreservedAIRegion &&
+        (!getDebugInfo() || !rec->hasAttr<BPFPreserveAccessIndexAttr>()))
+      // For structs, we GEP to the field that the record layout suggests.
+      addr = emitAddrOfFieldStorage(*this, addr, field);
+    else
+      // Remember the original struct field index
+      addr = emitPreserveStructAccess(*this, addr, field);
+  }
+
+  // If this is a reference field, load the reference right now.
+  if (FieldType->isReferenceType()) {
+    LValue RefLVal =
+        MakeAddrLValue(addr, FieldType, FieldBaseInfo, FieldTBAAInfo);
+    if (RecordCVR & Qualifiers::Volatile)
+      RefLVal.getQuals().addVolatile();
+    addr = EmitLoadOfReference(RefLVal, &FieldBaseInfo, &FieldTBAAInfo);
+
+    // Qualifiers on the struct don't apply to the referencee.
+    RecordCVR = 0;
+    FieldType = FieldType->getPointeeType();
+  }
+
+  // Make sure that the address is pointing to the right type.  This is critical
+  // for both unions and structs.  A union needs a bitcast, a struct element
+  // will need a bitcast if the LLVM type laid out doesn't match the desired
+  // type.
+  addr = Builder.CreateElementBitCast(
+      addr, CGM.getTypes().ConvertTypeForMem(FieldType), field->getName());
+
+  if (field->hasAttr<AnnotateAttr>())
+    addr = EmitFieldAnnotations(field, addr);
+
+  LValue LV = MakeAddrLValue(addr, FieldType, FieldBaseInfo, FieldTBAAInfo);
+  LV.getQuals().addCVRQualifiers(RecordCVR);
+
+  // __weak attribute on a field is ignored.
+  if (LV.getQuals().getObjCGCAttr() == Qualifiers::Weak)
+    LV.getQuals().removeObjCGCAttr();
+
+  return LV;
+}
+
+LValue
+CodeGenFunction::EmitLValueForFieldInitialization(LValue Base,
+                                                  const FieldDecl *Field) {
+  QualType FieldType = Field->getType();
+
+  if (!FieldType->isReferenceType())
+    return EmitLValueForField(Base, Field);
+
+  Address V = emitAddrOfFieldStorage(*this, Base.getAddress(*this), Field);
+
+  // Make sure that the address is pointing to the right type.
+  llvm::Type *llvmType = ConvertTypeForMem(FieldType);
+  V = Builder.CreateElementBitCast(V, llvmType, Field->getName());
+
+  // TODO: Generate TBAA information that describes this access as a structure
+  // member access and not just an access to an object of the field's type. This
+  // should be similar to what we do in EmitLValueForField().
+  LValueBaseInfo BaseInfo = Base.getBaseInfo();
+  AlignmentSource FieldAlignSource = BaseInfo.getAlignmentSource();
+  LValueBaseInfo FieldBaseInfo(getFieldAlignmentSource(FieldAlignSource));
+  return MakeAddrLValue(V, FieldType, FieldBaseInfo,
+                        CGM.getTBAAInfoForSubobject(Base, FieldType));
+}
+
+LValue CodeGenFunction::EmitCompoundLiteralLValue(const CompoundLiteralExpr *E){
+  if (E->isFileScope()) {
+    ConstantAddress GlobalPtr = CGM.GetAddrOfConstantCompoundLiteral(E);
+    return MakeAddrLValue(GlobalPtr, E->getType(), AlignmentSource::Decl);
+  }
+  if (E->getType()->isVariablyModifiedType())
+    // make sure to emit the VLA size.
+    EmitVariablyModifiedType(E->getType());
+
+  Address DeclPtr = CreateMemTemp(E->getType(), ".compoundliteral");
+  const Expr *InitExpr = E->getInitializer();
+  LValue Result = MakeAddrLValue(DeclPtr, E->getType(), AlignmentSource::Decl);
+
+  EmitAnyExprToMem(InitExpr, DeclPtr, E->getType().getQualifiers(),
+                   /*Init*/ true);
+
+  return Result;
+}
+
+LValue CodeGenFunction::EmitInitListLValue(const InitListExpr *E) {
+  if (!E->isGLValue())
+    // Initializing an aggregate temporary in C++11: T{...}.
+    return EmitAggExprToLValue(E);
+
+  // An lvalue initializer list must be initializing a reference.
+  assert(E->isTransparent() && "non-transparent glvalue init list");
+  return EmitLValue(E->getInit(0));
+}
+
+/// Emit the operand of a glvalue conditional operator. This is either a glvalue
+/// or a (possibly-parenthesized) throw-expression. If this is a throw, no
+/// LValue is returned and the current block has been terminated.
+static Optional<LValue> EmitLValueOrThrowExpression(CodeGenFunction &CGF,
+                                                    const Expr *Operand) {
+  if (auto *ThrowExpr = dyn_cast<CXXThrowExpr>(Operand->IgnoreParens())) {
+    CGF.EmitCXXThrowExpr(ThrowExpr, /*KeepInsertionPoint*/false);
+    return None;
+  }
+
+  return CGF.EmitLValue(Operand);
+}
+
+LValue CodeGenFunction::
+EmitConditionalOperatorLValue(const AbstractConditionalOperator *expr) {
+  if (!expr->isGLValue()) {
+    // ?: here should be an aggregate.
+    assert(hasAggregateEvaluationKind(expr->getType()) &&
+           "Unexpected conditional operator!");
+    return EmitAggExprToLValue(expr);
+  }
+
+  OpaqueValueMapping binding(*this, expr);
+
+  const Expr *condExpr = expr->getCond();
+  bool CondExprBool;
+  if (ConstantFoldsToSimpleInteger(condExpr, CondExprBool)) {
+    const Expr *live = expr->getTrueExpr(), *dead = expr->getFalseExpr();
+    if (!CondExprBool) std::swap(live, dead);
+
+    if (!ContainsLabel(dead)) {
+      // If the true case is live, we need to track its region.
+      if (CondExprBool)
+        incrementProfileCounter(expr);
+      return EmitLValue(live);
+    }
+  }
+
+  llvm::BasicBlock *lhsBlock = createBasicBlock("cond.true");
+  llvm::BasicBlock *rhsBlock = createBasicBlock("cond.false");
+  llvm::BasicBlock *contBlock = createBasicBlock("cond.end");
+
+  ConditionalEvaluation eval(*this);
+  EmitBranchOnBoolExpr(condExpr, lhsBlock, rhsBlock, getProfileCount(expr));
+
+  // Any temporaries created here are conditional.
+  EmitBlock(lhsBlock);
+  incrementProfileCounter(expr);
+  eval.begin(*this);
+  Optional<LValue> lhs =
+      EmitLValueOrThrowExpression(*this, expr->getTrueExpr());
+  eval.end(*this);
+
+  if (lhs && !lhs->isSimple())
+    return EmitUnsupportedLValue(expr, "conditional operator");
+
+  lhsBlock = Builder.GetInsertBlock();
+  if (lhs)
+    Builder.CreateBr(contBlock);
+
+  // Any temporaries created here are conditional.
+  EmitBlock(rhsBlock);
+  eval.begin(*this);
+  Optional<LValue> rhs =
+      EmitLValueOrThrowExpression(*this, expr->getFalseExpr());
+  eval.end(*this);
+  if (rhs && !rhs->isSimple())
+    return EmitUnsupportedLValue(expr, "conditional operator");
+  rhsBlock = Builder.GetInsertBlock();
+
+  EmitBlock(contBlock);
+
+  if (lhs && rhs) {
+    llvm::PHINode *phi =
+        Builder.CreatePHI(lhs->getPointer(*this)->getType(), 2, "cond-lvalue");
+    phi->addIncoming(lhs->getPointer(*this), lhsBlock);
+    phi->addIncoming(rhs->getPointer(*this), rhsBlock);
+    Address result(phi, std::min(lhs->getAlignment(), rhs->getAlignment()));
+    AlignmentSource alignSource =
+      std::max(lhs->getBaseInfo().getAlignmentSource(),
+               rhs->getBaseInfo().getAlignmentSource());
+    TBAAAccessInfo TBAAInfo = CGM.mergeTBAAInfoForConditionalOperator(
+        lhs->getTBAAInfo(), rhs->getTBAAInfo());
+    return MakeAddrLValue(result, expr->getType(), LValueBaseInfo(alignSource),
+                          TBAAInfo);
+  } else {
+    assert((lhs || rhs) &&
+           "both operands of glvalue conditional are throw-expressions?");
+    return lhs ? *lhs : *rhs;
+  }
+}
+
+/// EmitCastLValue - Casts are never lvalues unless that cast is to a reference
+/// type. If the cast is to a reference, we can have the usual lvalue result,
+/// otherwise if a cast is needed by the code generator in an lvalue context,
+/// then it must mean that we need the address of an aggregate in order to
+/// access one of its members.  This can happen for all the reasons that casts
+/// are permitted with aggregate result, including noop aggregate casts, and
+/// cast from scalar to union.
+LValue CodeGenFunction::EmitCastLValue(const CastExpr *E) {
+  switch (E->getCastKind()) {
+  case CK_ToVoid:
+  case CK_BitCast:
+  case CK_LValueToRValueBitCast:
+  case CK_ArrayToPointerDecay:
+  case CK_FunctionToPointerDecay:
+  case CK_NullToMemberPointer:
+  case CK_NullToPointer:
+  case CK_IntegralToPointer:
+  case CK_PointerToIntegral:
+  case CK_PointerToBoolean:
+  case CK_VectorSplat:
+  case CK_IntegralCast:
+  case CK_BooleanToSignedIntegral:
+  case CK_IntegralToBoolean:
+  case CK_IntegralToFloating:
+  case CK_FloatingToIntegral:
+  case CK_FloatingToBoolean:
+  case CK_FloatingCast:
+  case CK_FloatingRealToComplex:
+  case CK_FloatingComplexToReal:
+  case CK_FloatingComplexToBoolean:
+  case CK_FloatingComplexCast:
+  case CK_FloatingComplexToIntegralComplex:
+  case CK_IntegralRealToComplex:
+  case CK_IntegralComplexToReal:
+  case CK_IntegralComplexToBoolean:
+  case CK_IntegralComplexCast:
+  case CK_IntegralComplexToFloatingComplex:
+  case CK_DerivedToBaseMemberPointer:
+  case CK_BaseToDerivedMemberPointer:
+  case CK_MemberPointerToBoolean:
+  case CK_ReinterpretMemberPointer:
+  case CK_AnyPointerToBlockPointerCast:
+  case CK_ARCProduceObject:
+  case CK_ARCConsumeObject:
+  case CK_ARCReclaimReturnedObject:
+  case CK_ARCExtendBlockObject:
+  case CK_CopyAndAutoreleaseBlockObject:
+  case CK_IntToOCLSampler:
+  case CK_FixedPointCast:
+  case CK_FixedPointToBoolean:
+  case CK_FixedPointToIntegral:
+  case CK_IntegralToFixedPoint:
+    return EmitUnsupportedLValue(E, "unexpected cast lvalue");
+
+  case CK_Dependent:
+    llvm_unreachable("dependent cast kind in IR gen!");
+
+  case CK_BuiltinFnToFnPtr:
+    llvm_unreachable("builtin functions are handled elsewhere");
+
+  // These are never l-values; just use the aggregate emission code.
+  case CK_NonAtomicToAtomic:
+  case CK_AtomicToNonAtomic:
+    return EmitAggExprToLValue(E);
+
+  case CK_Dynamic: {
+    LValue LV = EmitLValue(E->getSubExpr());
+    Address V = LV.getAddress(*this);
+    const auto *DCE = cast<CXXDynamicCastExpr>(E);
+    return MakeNaturalAlignAddrLValue(EmitDynamicCast(V, DCE), E->getType());
+  }
+
+  case CK_ConstructorConversion:
+  case CK_UserDefinedConversion:
+  case CK_CPointerToObjCPointerCast:
+  case CK_BlockPointerToObjCPointerCast:
+  case CK_NoOp:
+  case CK_LValueToRValue:
+    return EmitLValue(E->getSubExpr());
+
+  case CK_UncheckedDerivedToBase:
+  case CK_DerivedToBase: {
+    const auto *DerivedClassTy =
+        E->getSubExpr()->getType()->castAs<RecordType>();
+    auto *DerivedClassDecl = cast<CXXRecordDecl>(DerivedClassTy->getDecl());
+
+    LValue LV = EmitLValue(E->getSubExpr());
+    Address This = LV.getAddress(*this);
+
+    // Perform the derived-to-base conversion
+    Address Base = GetAddressOfBaseClass(
+        This, DerivedClassDecl, E->path_begin(), E->path_end(),
+        /*NullCheckValue=*/false, E->getExprLoc());
+
+    // TODO: Support accesses to members of base classes in TBAA. For now, we
+    // conservatively pretend that the complete object is of the base class
+    // type.
+    return MakeAddrLValue(Base, E->getType(), LV.getBaseInfo(),
+                          CGM.getTBAAInfoForSubobject(LV, E->getType()));
+  }
+  case CK_ToUnion:
+    return EmitAggExprToLValue(E);
+  case CK_BaseToDerived: {
+    const auto *DerivedClassTy = E->getType()->castAs<RecordType>();
+    auto *DerivedClassDecl = cast<CXXRecordDecl>(DerivedClassTy->getDecl());
+
+    LValue LV = EmitLValue(E->getSubExpr());
+
+    // Perform the base-to-derived conversion
+    Address Derived = GetAddressOfDerivedClass(
+        LV.getAddress(*this), DerivedClassDecl, E->path_begin(), E->path_end(),
+        /*NullCheckValue=*/false);
+
+    // C++11 [expr.static.cast]p2: Behavior is undefined if a downcast is
+    // performed and the object is not of the derived type.
+    if (sanitizePerformTypeCheck())
+      EmitTypeCheck(TCK_DowncastReference, E->getExprLoc(),
+                    Derived.getPointer(), E->getType());
+
+    if (SanOpts.has(SanitizerKind::CFIDerivedCast))
+      EmitVTablePtrCheckForCast(E->getType(), Derived.getPointer(),
+                                /*MayBeNull=*/false, CFITCK_DerivedCast,
+                                E->getBeginLoc());
+
+    return MakeAddrLValue(Derived, E->getType(), LV.getBaseInfo(),
+                          CGM.getTBAAInfoForSubobject(LV, E->getType()));
+  }
+  case CK_LValueBitCast: {
+    // This must be a reinterpret_cast (or c-style equivalent).
+    const auto *CE = cast<ExplicitCastExpr>(E);
+
+    CGM.EmitExplicitCastExprType(CE, this);
+    LValue LV = EmitLValue(E->getSubExpr());
+    Address V = Builder.CreateBitCast(LV.getAddress(*this),
+                                      ConvertType(CE->getTypeAsWritten()));
+
+    if (SanOpts.has(SanitizerKind::CFIUnrelatedCast))
+      EmitVTablePtrCheckForCast(E->getType(), V.getPointer(),
+                                /*MayBeNull=*/false, CFITCK_UnrelatedCast,
+                                E->getBeginLoc());
+
+    return MakeAddrLValue(V, E->getType(), LV.getBaseInfo(),
+                          CGM.getTBAAInfoForSubobject(LV, E->getType()));
+  }
+  case CK_AddressSpaceConversion: {
+    LValue LV = EmitLValue(E->getSubExpr());
+    QualType DestTy = getContext().getPointerType(E->getType());
+    llvm::Value *V = getTargetHooks().performAddrSpaceCast(
+        *this, LV.getPointer(*this),
+        E->getSubExpr()->getType().getAddressSpace(),
+        E->getType().getAddressSpace(), ConvertType(DestTy));
+    return MakeAddrLValue(Address(V, LV.getAddress(*this).getAlignment()),
+                          E->getType(), LV.getBaseInfo(), LV.getTBAAInfo());
+  }
+  case CK_ObjCObjectLValueCast: {
+    LValue LV = EmitLValue(E->getSubExpr());
+    Address V = Builder.CreateElementBitCast(LV.getAddress(*this),
+                                             ConvertType(E->getType()));
+    return MakeAddrLValue(V, E->getType(), LV.getBaseInfo(),
+                          CGM.getTBAAInfoForSubobject(LV, E->getType()));
+  }
+  case CK_ZeroToOCLOpaqueType:
+    llvm_unreachable("NULL to OpenCL opaque type lvalue cast is not valid");
+  }
+
+  llvm_unreachable("Unhandled lvalue cast kind?");
+}
+
+LValue CodeGenFunction::EmitOpaqueValueLValue(const OpaqueValueExpr *e) {
+  assert(OpaqueValueMappingData::shouldBindAsLValue(e));
+  return getOrCreateOpaqueLValueMapping(e);
+}
+
+LValue
+CodeGenFunction::getOrCreateOpaqueLValueMapping(const OpaqueValueExpr *e) {
+  assert(OpaqueValueMapping::shouldBindAsLValue(e));
+
+  llvm::DenseMap<const OpaqueValueExpr*,LValue>::iterator
+      it = OpaqueLValues.find(e);
+
+  if (it != OpaqueLValues.end())
+    return it->second;
+
+  assert(e->isUnique() && "LValue for a nonunique OVE hasn't been emitted");
+  return EmitLValue(e->getSourceExpr());
+}
+
+RValue
+CodeGenFunction::getOrCreateOpaqueRValueMapping(const OpaqueValueExpr *e) {
+  assert(!OpaqueValueMapping::shouldBindAsLValue(e));
+
+  llvm::DenseMap<const OpaqueValueExpr*,RValue>::iterator
+      it = OpaqueRValues.find(e);
+
+  if (it != OpaqueRValues.end())
+    return it->second;
+
+  assert(e->isUnique() && "RValue for a nonunique OVE hasn't been emitted");
+  return EmitAnyExpr(e->getSourceExpr());
+}
+
+RValue CodeGenFunction::EmitRValueForField(LValue LV,
+                                           const FieldDecl *FD,
+                                           SourceLocation Loc) {
+  QualType FT = FD->getType();
+  LValue FieldLV = EmitLValueForField(LV, FD);
+  switch (getEvaluationKind(FT)) {
+  case TEK_Complex:
+    return RValue::getComplex(EmitLoadOfComplex(FieldLV, Loc));
+  case TEK_Aggregate:
+    return FieldLV.asAggregateRValue(*this);
+  case TEK_Scalar:
+    // This routine is used to load fields one-by-one to perform a copy, so
+    // don't load reference fields.
+    if (FD->getType()->isReferenceType())
+      return RValue::get(FieldLV.getPointer(*this));
+    // Call EmitLoadOfScalar except when the lvalue is a bitfield to emit a
+    // primitive load.
+    if (FieldLV.isBitField())
+      return EmitLoadOfLValue(FieldLV, Loc);
+    return RValue::get(EmitLoadOfScalar(FieldLV, Loc));
+  }
+  llvm_unreachable("bad evaluation kind");
+}
+
+//===--------------------------------------------------------------------===//
+//                             Expression Emission
+//===--------------------------------------------------------------------===//
+
+RValue CodeGenFunction::EmitCallExpr(const CallExpr *E,
+                                     ReturnValueSlot ReturnValue) {
+  // Builtins never have block type.
+  if (E->getCallee()->getType()->isBlockPointerType())
+    return EmitBlockCallExpr(E, ReturnValue);
+
+  if (const auto *CE = dyn_cast<CXXMemberCallExpr>(E))
+    return EmitCXXMemberCallExpr(CE, ReturnValue);
+
+  if (const auto *CE = dyn_cast<CUDAKernelCallExpr>(E))
+    return EmitCUDAKernelCallExpr(CE, ReturnValue);
+
+  if (const auto *CE = dyn_cast<CXXOperatorCallExpr>(E))
+    if (const CXXMethodDecl *MD =
+          dyn_cast_or_null<CXXMethodDecl>(CE->getCalleeDecl()))
+      return EmitCXXOperatorMemberCallExpr(CE, MD, ReturnValue);
+
+  CGCallee callee = EmitCallee(E->getCallee());
+
+  if (callee.isBuiltin()) {
+    return EmitBuiltinExpr(callee.getBuiltinDecl(), callee.getBuiltinID(),
+                           E, ReturnValue);
+  }
+
+  if (callee.isPseudoDestructor()) {
+    return EmitCXXPseudoDestructorExpr(callee.getPseudoDestructorExpr());
+  }
+
+  return EmitCall(E->getCallee()->getType(), callee, E, ReturnValue);
+}
+
+/// Emit a CallExpr without considering whether it might be a subclass.
+RValue CodeGenFunction::EmitSimpleCallExpr(const CallExpr *E,
+                                           ReturnValueSlot ReturnValue) {
+  CGCallee Callee = EmitCallee(E->getCallee());
+  return EmitCall(E->getCallee()->getType(), Callee, E, ReturnValue);
+}
+
+static CGCallee EmitDirectCallee(CodeGenFunction &CGF, const FunctionDecl *FD) {
+
+  if (auto builtinID = FD->getBuiltinID()) {
+    // Replaceable builtin provide their own implementation of a builtin. Unless
+    // we are in the builtin implementation itself, don't call the actual
+    // builtin. If we are in the builtin implementation, avoid trivial infinite
+    // recursion.
+    if (!FD->isInlineBuiltinDeclaration() ||
+        CGF.CurFn->getName() == FD->getName())
+      return CGCallee::forBuiltin(builtinID, FD);
+  }
+
+  llvm::Constant *calleePtr = EmitFunctionDeclPointer(CGF.CGM, FD);
+  return CGCallee::forDirect(calleePtr, GlobalDecl(FD));
+}
+
+CGCallee CodeGenFunction::EmitCallee(const Expr *E) {
+  E = E->IgnoreParens();
+
+  // Look through function-to-pointer decay.
+  if (auto ICE = dyn_cast<ImplicitCastExpr>(E)) {
+    if (ICE->getCastKind() == CK_FunctionToPointerDecay ||
+        ICE->getCastKind() == CK_BuiltinFnToFnPtr) {
+      return EmitCallee(ICE->getSubExpr());
+    }
+
+  // Resolve direct calls.
+  } else if (auto DRE = dyn_cast<DeclRefExpr>(E)) {
+    if (auto FD = dyn_cast<FunctionDecl>(DRE->getDecl())) {
+      return EmitDirectCallee(*this, FD);
+    }
+  } else if (auto ME = dyn_cast<MemberExpr>(E)) {
+    if (auto FD = dyn_cast<FunctionDecl>(ME->getMemberDecl())) {
+      EmitIgnoredExpr(ME->getBase());
+      return EmitDirectCallee(*this, FD);
+    }
+
+  // Look through template substitutions.
+  } else if (auto NTTP = dyn_cast<SubstNonTypeTemplateParmExpr>(E)) {
+    return EmitCallee(NTTP->getReplacement());
+
+  // Treat pseudo-destructor calls differently.
+  } else if (auto PDE = dyn_cast<CXXPseudoDestructorExpr>(E)) {
+    return CGCallee::forPseudoDestructor(PDE);
+  }
+
+  // Otherwise, we have an indirect reference.
+  llvm::Value *calleePtr;
+  QualType functionType;
+  if (auto ptrType = E->getType()->getAs<PointerType>()) {
+    calleePtr = EmitScalarExpr(E);
+    functionType = ptrType->getPointeeType();
+  } else {
+    functionType = E->getType();
+    calleePtr = EmitLValue(E).getPointer(*this);
+  }
+  assert(functionType->isFunctionType());
+
+  GlobalDecl GD;
+  if (const auto *VD =
+          dyn_cast_or_null<VarDecl>(E->getReferencedDeclOfCallee()))
+    GD = GlobalDecl(VD);
+
+  CGCalleeInfo calleeInfo(functionType->getAs<FunctionProtoType>(), GD);
+  CGCallee callee(calleeInfo, calleePtr);
+  return callee;
+}
+
+LValue CodeGenFunction::EmitBinaryOperatorLValue(const BinaryOperator *E) {
+  // Comma expressions just emit their LHS then their RHS as an l-value.
+  if (E->getOpcode() == BO_Comma) {
+    EmitIgnoredExpr(E->getLHS());
+    EnsureInsertPoint();
+    return EmitLValue(E->getRHS());
+  }
+
+  if (E->getOpcode() == BO_PtrMemD ||
+      E->getOpcode() == BO_PtrMemI)
+    return EmitPointerToDataMemberBinaryExpr(E);
+
+  assert(E->getOpcode() == BO_Assign && "unexpected binary l-value");
+
+  // Note that in all of these cases, __block variables need the RHS
+  // evaluated first just in case the variable gets moved by the RHS.
+
+  switch (getEvaluationKind(E->getType())) {
+  case TEK_Scalar: {
+    switch (E->getLHS()->getType().getObjCLifetime()) {
+    case Qualifiers::OCL_Strong:
+      return EmitARCStoreStrong(E, /*ignored*/ false).first;
+
+    case Qualifiers::OCL_Autoreleasing:
+      return EmitARCStoreAutoreleasing(E).first;
+
+    // No reason to do any of these differently.
+    case Qualifiers::OCL_None:
+    case Qualifiers::OCL_ExplicitNone:
+    case Qualifiers::OCL_Weak:
+      break;
+    }
+
+    RValue RV = EmitAnyExpr(E->getRHS());
+    LValue LV = EmitCheckedLValue(E->getLHS(), TCK_Store);
+    if (RV.isScalar())
+      EmitNullabilityCheck(LV, RV.getScalarVal(), E->getExprLoc());
+    EmitStoreThroughLValue(RV, LV);
+    if (getLangOpts().OpenMP)
+      CGM.getOpenMPRuntime().checkAndEmitLastprivateConditional(*this,
+                                                                E->getLHS());
+    return LV;
+  }
+
+  case TEK_Complex:
+    return EmitComplexAssignmentLValue(E);
+
+  case TEK_Aggregate:
+    return EmitAggExprToLValue(E);
+  }
+  llvm_unreachable("bad evaluation kind");
+}
+
+LValue CodeGenFunction::EmitCallExprLValue(const CallExpr *E) {
+  RValue RV = EmitCallExpr(E);
+
+  if (!RV.isScalar())
+    return MakeAddrLValue(RV.getAggregateAddress(), E->getType(),
+                          AlignmentSource::Decl);
+
+  assert(E->getCallReturnType(getContext())->isReferenceType() &&
+         "Can't have a scalar return unless the return type is a "
+         "reference type!");
+
+  return MakeNaturalAlignPointeeAddrLValue(RV.getScalarVal(), E->getType());
+}
+
+LValue CodeGenFunction::EmitVAArgExprLValue(const VAArgExpr *E) {
+  // FIXME: This shouldn't require another copy.
+  return EmitAggExprToLValue(E);
+}
+
+LValue CodeGenFunction::EmitCXXConstructLValue(const CXXConstructExpr *E) {
+  assert(E->getType()->getAsCXXRecordDecl()->hasTrivialDestructor()
+         && "binding l-value to type which needs a temporary");
+  AggValueSlot Slot = CreateAggTemp(E->getType());
+  EmitCXXConstructExpr(E, Slot);
+  return MakeAddrLValue(Slot.getAddress(), E->getType(), AlignmentSource::Decl);
+}
+
+LValue
+CodeGenFunction::EmitCXXTypeidLValue(const CXXTypeidExpr *E) {
+  return MakeNaturalAlignAddrLValue(EmitCXXTypeidExpr(E), E->getType());
+}
+
+Address CodeGenFunction::EmitCXXUuidofExpr(const CXXUuidofExpr *E) {
+  return Builder.CreateElementBitCast(CGM.GetAddrOfUuidDescriptor(E),
+                                      ConvertType(E->getType()));
+}
+
+LValue CodeGenFunction::EmitCXXUuidofLValue(const CXXUuidofExpr *E) {
+  return MakeAddrLValue(EmitCXXUuidofExpr(E), E->getType(),
+                        AlignmentSource::Decl);
+}
+
+LValue
+CodeGenFunction::EmitCXXBindTemporaryLValue(const CXXBindTemporaryExpr *E) {
+  AggValueSlot Slot = CreateAggTemp(E->getType(), "temp.lvalue");
+  Slot.setExternallyDestructed();
+  EmitAggExpr(E->getSubExpr(), Slot);
+  EmitCXXTemporary(E->getTemporary(), E->getType(), Slot.getAddress());
+  return MakeAddrLValue(Slot.getAddress(), E->getType(), AlignmentSource::Decl);
+}
+
+LValue CodeGenFunction::EmitObjCMessageExprLValue(const ObjCMessageExpr *E) {
+  RValue RV = EmitObjCMessageExpr(E);
+
+  if (!RV.isScalar())
+    return MakeAddrLValue(RV.getAggregateAddress(), E->getType(),
+                          AlignmentSource::Decl);
+
+  assert(E->getMethodDecl()->getReturnType()->isReferenceType() &&
+         "Can't have a scalar return unless the return type is a "
+         "reference type!");
+
+  return MakeNaturalAlignPointeeAddrLValue(RV.getScalarVal(), E->getType());
+}
+
+LValue CodeGenFunction::EmitObjCSelectorLValue(const ObjCSelectorExpr *E) {
+  Address V =
+    CGM.getObjCRuntime().GetAddrOfSelector(*this, E->getSelector());
+  return MakeAddrLValue(V, E->getType(), AlignmentSource::Decl);
+}
+
+llvm::Value *CodeGenFunction::EmitIvarOffset(const ObjCInterfaceDecl *Interface,
+                                             const ObjCIvarDecl *Ivar) {
+  return CGM.getObjCRuntime().EmitIvarOffset(*this, Interface, Ivar);
+}
+
+LValue CodeGenFunction::EmitLValueForIvar(QualType ObjectTy,
+                                          llvm::Value *BaseValue,
+                                          const ObjCIvarDecl *Ivar,
+                                          unsigned CVRQualifiers) {
+  return CGM.getObjCRuntime().EmitObjCValueForIvar(*this, ObjectTy, BaseValue,
+                                                   Ivar, CVRQualifiers);
+}
+
+LValue CodeGenFunction::EmitObjCIvarRefLValue(const ObjCIvarRefExpr *E) {
+  // FIXME: A lot of the code below could be shared with EmitMemberExpr.
+  llvm::Value *BaseValue = nullptr;
+  const Expr *BaseExpr = E->getBase();
+  Qualifiers BaseQuals;
+  QualType ObjectTy;
+  if (E->isArrow()) {
+    BaseValue = EmitScalarExpr(BaseExpr);
+    ObjectTy = BaseExpr->getType()->getPointeeType();
+    BaseQuals = ObjectTy.getQualifiers();
+  } else {
+    LValue BaseLV = EmitLValue(BaseExpr);
+    BaseValue = BaseLV.getPointer(*this);
+    ObjectTy = BaseExpr->getType();
+    BaseQuals = ObjectTy.getQualifiers();
+  }
+
+  LValue LV =
+    EmitLValueForIvar(ObjectTy, BaseValue, E->getDecl(),
+                      BaseQuals.getCVRQualifiers());
+  setObjCGCLValueClass(getContext(), E, LV);
+  return LV;
+}
+
+LValue CodeGenFunction::EmitStmtExprLValue(const StmtExpr *E) {
+  // Can only get l-value for message expression returning aggregate type
+  RValue RV = EmitAnyExprToTemp(E);
+  return MakeAddrLValue(RV.getAggregateAddress(), E->getType(),
+                        AlignmentSource::Decl);
+}
+
+RValue CodeGenFunction::EmitCall(QualType CalleeType, const CGCallee &OrigCallee,
+                                 const CallExpr *E, ReturnValueSlot ReturnValue,
+                                 llvm::Value *Chain) {
+  // Get the actual function type. The callee type will always be a pointer to
+  // function type or a block pointer type.
+  assert(CalleeType->isFunctionPointerType() &&
+         "Call must have function pointer type!");
+
+  const Decl *TargetDecl =
+      OrigCallee.getAbstractInfo().getCalleeDecl().getDecl();
+
+  CalleeType = getContext().getCanonicalType(CalleeType);
+
+  auto PointeeType = cast<PointerType>(CalleeType)->getPointeeType();
+
+  CGCallee Callee = OrigCallee;
+
+  if (getLangOpts().CPlusPlus && SanOpts.has(SanitizerKind::Function) &&
+      (!TargetDecl || !isa<FunctionDecl>(TargetDecl))) {
+    if (llvm::Constant *PrefixSig =
+            CGM.getTargetCodeGenInfo().getUBSanFunctionSignature(CGM)) {
+      SanitizerScope SanScope(this);
+      // Remove any (C++17) exception specifications, to allow calling e.g. a
+      // noexcept function through a non-noexcept pointer.
+      auto ProtoTy =
+        getContext().getFunctionTypeWithExceptionSpec(PointeeType, EST_None);
+      llvm::Constant *FTRTTIConst =
+          CGM.GetAddrOfRTTIDescriptor(ProtoTy, /*ForEH=*/true);
+      llvm::Type *PrefixStructTyElems[] = {PrefixSig->getType(), Int32Ty};
+      llvm::StructType *PrefixStructTy = llvm::StructType::get(
+          CGM.getLLVMContext(), PrefixStructTyElems, /*isPacked=*/true);
+
+      llvm::Value *CalleePtr = Callee.getFunctionPointer();
+
+      llvm::Value *CalleePrefixStruct = Builder.CreateBitCast(
+          CalleePtr, llvm::PointerType::getUnqual(PrefixStructTy));
+      llvm::Value *CalleeSigPtr =
+          Builder.CreateConstGEP2_32(PrefixStructTy, CalleePrefixStruct, 0, 0);
+      llvm::Value *CalleeSig =
+          Builder.CreateAlignedLoad(CalleeSigPtr, getIntAlign());
+      llvm::Value *CalleeSigMatch = Builder.CreateICmpEQ(CalleeSig, PrefixSig);
+
+      llvm::BasicBlock *Cont = createBasicBlock("cont");
+      llvm::BasicBlock *TypeCheck = createBasicBlock("typecheck");
+      Builder.CreateCondBr(CalleeSigMatch, TypeCheck, Cont);
+
+      EmitBlock(TypeCheck);
+      llvm::Value *CalleeRTTIPtr =
+          Builder.CreateConstGEP2_32(PrefixStructTy, CalleePrefixStruct, 0, 1);
+      llvm::Value *CalleeRTTIEncoded =
+          Builder.CreateAlignedLoad(CalleeRTTIPtr, getPointerAlign());
+      llvm::Value *CalleeRTTI =
+          DecodeAddrUsedInPrologue(CalleePtr, CalleeRTTIEncoded);
+      llvm::Value *CalleeRTTIMatch =
+          Builder.CreateICmpEQ(CalleeRTTI, FTRTTIConst);
+      llvm::Constant *StaticData[] = {EmitCheckSourceLocation(E->getBeginLoc()),
+                                      EmitCheckTypeDescriptor(CalleeType)};
+      EmitCheck(std::make_pair(CalleeRTTIMatch, SanitizerKind::Function),
+                SanitizerHandler::FunctionTypeMismatch, StaticData,
+                {CalleePtr, CalleeRTTI, FTRTTIConst});
+
+      Builder.CreateBr(Cont);
+      EmitBlock(Cont);
+    }
+  }
+
+  const auto *FnType = cast<FunctionType>(PointeeType);
+
+  // If we are checking indirect calls and this call is indirect, check that the
+  // function pointer is a member of the bit set for the function type.
+  if (SanOpts.has(SanitizerKind::CFIICall) &&
+      (!TargetDecl || !isa<FunctionDecl>(TargetDecl))) {
+    SanitizerScope SanScope(this);
+    EmitSanitizerStatReport(llvm::SanStat_CFI_ICall);
+
+    llvm::Metadata *MD;
+    if (CGM.getCodeGenOpts().SanitizeCfiICallGeneralizePointers)
+      MD = CGM.CreateMetadataIdentifierGeneralized(QualType(FnType, 0));
+    else
+      MD = CGM.CreateMetadataIdentifierForType(QualType(FnType, 0));
+
+    llvm::Value *TypeId = llvm::MetadataAsValue::get(getLLVMContext(), MD);
+
+    llvm::Value *CalleePtr = Callee.getFunctionPointer();
+    llvm::Value *CastedCallee = Builder.CreateBitCast(CalleePtr, Int8PtrTy);
+    llvm::Value *TypeTest = Builder.CreateCall(
+        CGM.getIntrinsic(llvm::Intrinsic::type_test), {CastedCallee, TypeId});
+
+    auto CrossDsoTypeId = CGM.CreateCrossDsoCfiTypeId(MD);
+    llvm::Constant *StaticData[] = {
+        llvm::ConstantInt::get(Int8Ty, CFITCK_ICall),
+        EmitCheckSourceLocation(E->getBeginLoc()),
+        EmitCheckTypeDescriptor(QualType(FnType, 0)),
+    };
+    if (CGM.getCodeGenOpts().SanitizeCfiCrossDso && CrossDsoTypeId) {
+      EmitCfiSlowPathCheck(SanitizerKind::CFIICall, TypeTest, CrossDsoTypeId,
+                           CastedCallee, StaticData);
+    } else {
+      EmitCheck(std::make_pair(TypeTest, SanitizerKind::CFIICall),
+                SanitizerHandler::CFICheckFail, StaticData,
+                {CastedCallee, llvm::UndefValue::get(IntPtrTy)});
+    }
+  }
+
+  CallArgList Args;
+  if (Chain)
+    Args.add(RValue::get(Builder.CreateBitCast(Chain, CGM.VoidPtrTy)),
+             CGM.getContext().VoidPtrTy);
+
+  // C++17 requires that we evaluate arguments to a call using assignment syntax
+  // right-to-left, and that we evaluate arguments to certain other operators
+  // left-to-right. Note that we allow this to override the order dictated by
+  // the calling convention on the MS ABI, which means that parameter
+  // destruction order is not necessarily reverse construction order.
+  // FIXME: Revisit this based on C++ committee response to unimplementability.
+  EvaluationOrder Order = EvaluationOrder::Default;
+  if (auto *OCE = dyn_cast<CXXOperatorCallExpr>(E)) {
+    if (OCE->isAssignmentOp())
+      Order = EvaluationOrder::ForceRightToLeft;
+    else {
+      switch (OCE->getOperator()) {
+      case OO_LessLess:
+      case OO_GreaterGreater:
+      case OO_AmpAmp:
+      case OO_PipePipe:
+      case OO_Comma:
+      case OO_ArrowStar:
+        Order = EvaluationOrder::ForceLeftToRight;
+        break;
+      default:
+        break;
+      }
+    }
+  }
+
+  EmitCallArgs(Args, dyn_cast<FunctionProtoType>(FnType), E->arguments(),
+               E->getDirectCallee(), /*ParamsToSkip*/ 0, Order);
+
+  const CGFunctionInfo &FnInfo = CGM.getTypes().arrangeFreeFunctionCall(
+      Args, FnType, /*ChainCall=*/Chain);
+
+  // C99 6.5.2.2p6:
+  //   If the expression that denotes the called function has a type
+  //   that does not include a prototype, [the default argument
+  //   promotions are performed]. If the number of arguments does not
+  //   equal the number of parameters, the behavior is undefined. If
+  //   the function is defined with a type that includes a prototype,
+  //   and either the prototype ends with an ellipsis (, ...) or the
+  //   types of the arguments after promotion are not compatible with
+  //   the types of the parameters, the behavior is undefined. If the
+  //   function is defined with a type that does not include a
+  //   prototype, and the types of the arguments after promotion are
+  //   not compatible with those of the parameters after promotion,
+  //   the behavior is undefined [except in some trivial cases].
+  // That is, in the general case, we should assume that a call
+  // through an unprototyped function type works like a *non-variadic*
+  // call.  The way we make this work is to cast to the exact type
+  // of the promoted arguments.
+  //
+  // Chain calls use this same code path to add the invisible chain parameter
+  // to the function type.
+  if (isa<FunctionNoProtoType>(FnType) || Chain) {
+    llvm::Type *CalleeTy = getTypes().GetFunctionType(FnInfo);
+    CalleeTy = CalleeTy->getPointerTo();
+
+    llvm::Value *CalleePtr = Callee.getFunctionPointer();
+    CalleePtr = Builder.CreateBitCast(CalleePtr, CalleeTy, "callee.knr.cast");
+    Callee.setFunctionPointer(CalleePtr);
+  }
+
+  llvm::CallBase *CallOrInvoke = nullptr;
+  RValue Call = EmitCall(FnInfo, Callee, ReturnValue, Args, &CallOrInvoke,
+                         E->getExprLoc());
+
+  // Generate function declaration DISuprogram in order to be used
+  // in debug info about call sites.
+  if (CGDebugInfo *DI = getDebugInfo()) {
+    if (auto *CalleeDecl = dyn_cast_or_null<FunctionDecl>(TargetDecl))
+      DI->EmitFuncDeclForCallSite(CallOrInvoke, QualType(FnType, 0),
+                                  CalleeDecl);
+  }
+
+  return Call;
+}
+
+LValue CodeGenFunction::
+EmitPointerToDataMemberBinaryExpr(const BinaryOperator *E) {
+  Address BaseAddr = Address::invalid();
+  if (E->getOpcode() == BO_PtrMemI) {
+    BaseAddr = EmitPointerWithAlignment(E->getLHS());
+  } else {
+    BaseAddr = EmitLValue(E->getLHS()).getAddress(*this);
+  }
+
+  llvm::Value *OffsetV = EmitScalarExpr(E->getRHS());
+  const auto *MPT = E->getRHS()->getType()->castAs<MemberPointerType>();
+
+  LValueBaseInfo BaseInfo;
+  TBAAAccessInfo TBAAInfo;
+  Address MemberAddr =
+    EmitCXXMemberDataPointerAddress(E, BaseAddr, OffsetV, MPT, &BaseInfo,
+                                    &TBAAInfo);
+
+  return MakeAddrLValue(MemberAddr, MPT->getPointeeType(), BaseInfo, TBAAInfo);
+}
+
+/// Given the address of a temporary variable, produce an r-value of
+/// its type.
+RValue CodeGenFunction::convertTempToRValue(Address addr,
+                                            QualType type,
+                                            SourceLocation loc) {
+  LValue lvalue = MakeAddrLValue(addr, type, AlignmentSource::Decl);
+  switch (getEvaluationKind(type)) {
+  case TEK_Complex:
+    return RValue::getComplex(EmitLoadOfComplex(lvalue, loc));
+  case TEK_Aggregate:
+    return lvalue.asAggregateRValue(*this);
+  case TEK_Scalar:
+    return RValue::get(EmitLoadOfScalar(lvalue, loc));
+  }
+  llvm_unreachable("bad evaluation kind");
+}
+
+void CodeGenFunction::SetFPAccuracy(llvm::Value *Val, float Accuracy) {
+  assert(Val->getType()->isFPOrFPVectorTy());
+  if (Accuracy == 0.0 || !isa<llvm::Instruction>(Val))
+    return;
+
+  llvm::MDBuilder MDHelper(getLLVMContext());
+  llvm::MDNode *Node = MDHelper.createFPMath(Accuracy);
+
+  cast<llvm::Instruction>(Val)->setMetadata(llvm::LLVMContext::MD_fpmath, Node);
+}
+
+namespace {
+  struct LValueOrRValue {
+    LValue LV;
+    RValue RV;
+  };
+}
+
+static LValueOrRValue emitPseudoObjectExpr(CodeGenFunction &CGF,
+                                           const PseudoObjectExpr *E,
+                                           bool forLValue,
+                                           AggValueSlot slot) {
+  SmallVector<CodeGenFunction::OpaqueValueMappingData, 4> opaques;
+
+  // Find the result expression, if any.
+  const Expr *resultExpr = E->getResultExpr();
+  LValueOrRValue result;
+
+  for (PseudoObjectExpr::const_semantics_iterator
+         i = E->semantics_begin(), e = E->semantics_end(); i != e; ++i) {
+    const Expr *semantic = *i;
+
+    // If this semantic expression is an opaque value, bind it
+    // to the result of its source expression.
+    if (const auto *ov = dyn_cast<OpaqueValueExpr>(semantic)) {
+      // Skip unique OVEs.
+      if (ov->isUnique()) {
+        assert(ov != resultExpr &&
+               "A unique OVE cannot be used as the result expression");
+        continue;
+      }
+
+      // If this is the result expression, we may need to evaluate
+      // directly into the slot.
+      typedef CodeGenFunction::OpaqueValueMappingData OVMA;
+      OVMA opaqueData;
+      if (ov == resultExpr && ov->isRValue() && !forLValue &&
+          CodeGenFunction::hasAggregateEvaluationKind(ov->getType())) {
+        CGF.EmitAggExpr(ov->getSourceExpr(), slot);
+        LValue LV = CGF.MakeAddrLValue(slot.getAddress(), ov->getType(),
+                                       AlignmentSource::Decl);
+        opaqueData = OVMA::bind(CGF, ov, LV);
+        result.RV = slot.asRValue();
+
+      // Otherwise, emit as normal.
+      } else {
+        opaqueData = OVMA::bind(CGF, ov, ov->getSourceExpr());
+
+        // If this is the result, also evaluate the result now.
+        if (ov == resultExpr) {
+          if (forLValue)
+            result.LV = CGF.EmitLValue(ov);
+          else
+            result.RV = CGF.EmitAnyExpr(ov, slot);
+        }
+      }
+
+      opaques.push_back(opaqueData);
+
+    // Otherwise, if the expression is the result, evaluate it
+    // and remember the result.
+    } else if (semantic == resultExpr) {
+      if (forLValue)
+        result.LV = CGF.EmitLValue(semantic);
+      else
+        result.RV = CGF.EmitAnyExpr(semantic, slot);
+
+    // Otherwise, evaluate the expression in an ignored context.
+    } else {
+      CGF.EmitIgnoredExpr(semantic);
+    }
+  }
+
+  // Unbind all the opaques now.
+  for (unsigned i = 0, e = opaques.size(); i != e; ++i)
+    opaques[i].unbind(CGF);
+
+  return result;
+}
+
+RValue CodeGenFunction::EmitPseudoObjectRValue(const PseudoObjectExpr *E,
+                                               AggValueSlot slot) {
+  return emitPseudoObjectExpr(*this, E, false, slot).RV;
+}
+
+LValue CodeGenFunction::EmitPseudoObjectLValue(const PseudoObjectExpr *E) {
+  return emitPseudoObjectExpr(*this, E, true, AggValueSlot::ignored()).LV;
+}