/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp

Bug Summary

File:	clang/lib/CodeGen/CGExpr.cpp
Warning:	line 4388, column 50 Called C++ object pointer is null
Annotated Source Code

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clang -cc1 -triple x86_64-pc-linux-gnu -analyze -disable-free -disable-llvm-verifier -discard-value-names -main-file-name CGExpr.cpp -analyzer-store=region -analyzer-opt-analyze-nested-blocks -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=cplusplus -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -setup-static-analyzer -analyzer-config-compatibility-mode=true -mrelocation-model pic -pic-level 2 -mthread-model posix -mframe-pointer=none -relaxed-aliasing -fmath-errno -fno-rounding-math -masm-verbose -mconstructor-aliases -munwind-tables -fuse-init-array -target-cpu x86-64 -dwarf-column-info -debugger-tuning=gdb -ffunction-sections -fdata-sections -resource-dir /usr/lib/llvm-10/lib/clang/10.0.0 -D CLANG_VENDOR="Debian " -D _DEBUG -D _GNU_SOURCE -D __STDC_CONSTANT_MACROS -D __STDC_FORMAT_MACROS -D __STDC_LIMIT_MACROS -I /build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/build-llvm/tools/clang/lib/CodeGen -I /build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen -I /build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/include -I /build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/build-llvm/tools/clang/include -I /build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/build-llvm/include -I /build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/include -U NDEBUG -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/c++/6.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/x86_64-linux-gnu/c++/6.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/x86_64-linux-gnu/c++/6.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/c++/6.3.0/backward -internal-isystem /usr/local/include -internal-isystem /usr/lib/llvm-10/lib/clang/10.0.0/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -O2 -Wno-unused-parameter -Wwrite-strings -Wno-missing-field-initializers -Wno-long-long -Wno-maybe-uninitialized -Wno-comment -std=c++14 -fdeprecated-macro -fdebug-compilation-dir /build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/build-llvm/tools/clang/lib/CodeGen -fdebug-prefix-map=/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809=. -ferror-limit 19 -fmessage-length 0 -fvisibility-inlines-hidden -stack-protector 2 -fgnuc-version=4.2.1 -fobjc-runtime=gcc -fno-common -fdiagnostics-show-option -vectorize-loops -vectorize-slp -analyzer-output=html -analyzer-config stable-report-filename=true -faddrsig -o /tmp/scan-build-2019-12-11-181444-25759-1 -x c++ /build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp
1//===--- CGExpr.cpp - Emit LLVM Code from Expressions ---------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9// This contains code to emit Expr nodes as LLVM code.
10//
11//===----------------------------------------------------------------------===//

13#include "CGCXXABI.h"
14#include "CGCall.h"
15#include "CGCleanup.h"
16#include "CGDebugInfo.h"
17#include "CGObjCRuntime.h"
18#include "CGOpenMPRuntime.h"
19#include "CGRecordLayout.h"
20#include "CodeGenFunction.h"
21#include "CodeGenModule.h"
22#include "ConstantEmitter.h"
23#include "TargetInfo.h"
24#include "clang/AST/ASTContext.h"
25#include "clang/AST/Attr.h"
26#include "clang/AST/DeclObjC.h"
27#include "clang/AST/NSAPI.h"
28#include "clang/Basic/Builtins.h"
29#include "clang/Basic/CodeGenOptions.h"
30#include "llvm/ADT/Hashing.h"
31#include "llvm/ADT/StringExtras.h"
32#include "llvm/IR/DataLayout.h"
33#include "llvm/IR/Intrinsics.h"
34#include "llvm/IR/LLVMContext.h"
35#include "llvm/IR/MDBuilder.h"
36#include "llvm/Support/ConvertUTF.h"
37#include "llvm/Support/MathExtras.h"
38#include "llvm/Support/Path.h"
39#include "llvm/Transforms/Utils/SanitizerStats.h"

41#include <string>

43using namespace clang;
44using namespace CodeGen;

46//===--------------------------------------------------------------------===//
47//                        Miscellaneous Helper Methods
48//===--------------------------------------------------------------------===//

50llvm::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);
60}

62/// CreateTempAlloca - This creates a alloca and inserts it into the entry
63/// block.
64Address 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);
71}

73/// CreateTempAlloca - This creates a alloca and inserts it into the entry
74/// block. The alloca is casted to default address space if necessary.
75Address 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);
101}

103/// CreateTempAlloca - This creates an alloca and inserts it into the entry
104/// block if \p ArraySize is nullptr, otherwise inserts it at the current
105/// insertion point of the builder.
106llvm::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);
113}

115/// CreateDefaultAlignTempAlloca - This creates an alloca with the
116/// default alignment of the corresponding LLVM type, which is *not*
117/// guaranteed to be related in any way to the expected alignment of
118/// an AST type that might have been lowered to Ty.
119Address CodeGenFunction::CreateDefaultAlignTempAlloca(llvm::Type *Ty,
                                                    const Twine &Name) {
CharUnits Align =
  CharUnits::fromQuantity(CGM.getDataLayout().getABITypeAlignment(Ty));
return CreateTempAlloca(Ty, Align, Name);
124}

126void CodeGenFunction::InitTempAlloca(Address Var, llvm::Value *Init) {
assert(isa<llvm::AllocaInst>(Var.getPointer()))((isa<llvm::AllocaInst>(Var.getPointer())) ? static_cast
<void> (0) : __assert_fail ("isa<llvm::AllocaInst>(Var.getPointer())"
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 127, __PRETTY_FUNCTION__));
auto *Store = new llvm::StoreInst(Init, Var.getPointer());
Store->setAlignment(Var.getAlignment().getAsAlign());
llvm::BasicBlock *Block = AllocaInsertPt->getParent();
Block->getInstList().insertAfter(AllocaInsertPt->getIterator(), Store);
132}

134Address CodeGenFunction::CreateIRTemp(QualType Ty, const Twine &Name) {
CharUnits Align = getContext().getTypeAlignInChars(Ty);
return CreateTempAlloca(ConvertType(Ty), Align, Name);
137}

139Address 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);
143}

145Address CodeGenFunction::CreateMemTemp(QualType Ty, CharUnits Align,
                                     const Twine &Name, Address *Alloca) {
return CreateTempAlloca(ConvertTypeForMem(Ty), Align, Name,
                        /*ArraySize=*/nullptr, Alloca);
149}

151Address CodeGenFunction::CreateMemTempWithoutCast(QualType Ty, CharUnits Align,
                                                const Twine &Name) {
return CreateTempAllocaWithoutCast(ConvertTypeForMem(Ty), Align, Name);
154}

156Address CodeGenFunction::CreateMemTempWithoutCast(QualType Ty,
                                                const Twine &Name) {
return CreateMemTempWithoutCast(Ty, getContext().getTypeAlignInChars(Ty),
                                Name);
160}

162/// EvaluateExprAsBool - Perform the usual unary conversions on the specified
163/// expression and compare the result against zero, returning an Int1Ty value.
164llvm::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);
178}

180/// EmitIgnoredExpr - Emit code to compute the specified expression,
181/// ignoring the result.
182void CodeGenFunction::EmitIgnoredExpr(const Expr *E) {
if (E->isRValue())
9
←
Taking false branch→
  return (void) EmitAnyExpr(E, AggValueSlot::ignored(), true);

// Just emit it as an l-value and drop the result.
EmitLValue(E);
10
←
Calling 'CodeGenFunction::EmitLValue'→
188}

190/// EmitAnyExpr - Emit code to compute the specified expression which
191/// can have any type.  The result is returned as an RValue struct.
192/// If this is an aggregate expression, AggSlot indicates where the
193/// result should be returned.
194RValue 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")::llvm::llvm_unreachable_internal("bad evaluation kind", "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 208);
209}

211/// EmitAnyExprToTemp - Similar to EmitAnyExpr(), however, the result will
212/// always be accessible even if no aggregate location is provided.
213RValue CodeGenFunction::EmitAnyExprToTemp(const Expr *E) {
AggValueSlot AggSlot = AggValueSlot::ignored();

if (hasAggregateEvaluationKind(E->getType()))
  AggSlot = CreateAggTemp(E->getType(), "agg.tmp");
return EmitAnyExpr(E, AggSlot);
219}

221/// EmitAnyExprToMem - Evaluate an expression into a given memory
222/// location.
223void 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")::llvm::llvm_unreachable_internal("bad evaluation kind", "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 250);
251}

253static void
254pushTemporaryCleanup(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::llvm_unreachable_internal("temporary cannot have dynamic storage duration"
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 312);
    }
    llvm_unreachable("unknown storage duration")::llvm::llvm_unreachable_internal("unknown storage duration",
 "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 314);
  }
}

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")::llvm::llvm_unreachable_internal("temporary cannot have dynamic storage duration"
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 366);
}
368}

370static 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::llvm_unreachable_internal("temporary can't have dynamic storage duration"
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 413);
}
llvm_unreachable("unknown storage duration")::llvm::llvm_unreachable_internal("unknown storage duration",
 "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 415);
416}

418LValue CodeGenFunction::
419EmitMaterializeTemporaryExpr(const MaterializeTemporaryExpr *M) {
const Expr *E = M->GetTemporaryExpr();

assert((!M->getExtendingDecl() || !isa<VarDecl>(M->getExtendingDecl()) ||(((!M->getExtendingDecl() || !isa<VarDecl>(M->getExtendingDecl
()) || !cast<VarDecl>(M->getExtendingDecl())->isARCPseudoStrong
()) && "Reference should never be pseudo-strong!") ? static_cast
<void> (0) : __assert_fail ("(!M->getExtendingDecl() || !isa<VarDecl>(M->getExtendingDecl()) || !cast<VarDecl>(M->getExtendingDecl())->isARCPseudoStrong()) && \"Reference should never be pseudo-strong!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 424, __PRETTY_FUNCTION__))
        !cast<VarDecl>(M->getExtendingDecl())->isARCPseudoStrong()) &&(((!M->getExtendingDecl() || !isa<VarDecl>(M->getExtendingDecl
()) || !cast<VarDecl>(M->getExtendingDecl())->isARCPseudoStrong
()) && "Reference should never be pseudo-strong!") ? static_cast
<void> (0) : __assert_fail ("(!M->getExtendingDecl() || !isa<VarDecl>(M->getExtendingDecl()) || !cast<VarDecl>(M->getExtendingDecl())->isARCPseudoStrong()) && \"Reference should never be pseudo-strong!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 424, __PRETTY_FUNCTION__))
       "Reference should never be pseudo-strong!")(((!M->getExtendingDecl() || !isa<VarDecl>(M->getExtendingDecl
()) || !cast<VarDecl>(M->getExtendingDecl())->isARCPseudoStrong
()) && "Reference should never be pseudo-strong!") ? static_cast
<void> (0) : __assert_fail ("(!M->getExtendingDecl() || !isa<VarDecl>(M->getExtendingDecl()) || !cast<VarDecl>(M->getExtendingDecl())->isARCPseudoStrong()) && \"Reference should never be pseudo-strong!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 424, __PRETTY_FUNCTION__));

// 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")::llvm::llvm_unreachable_internal("expected scalar or aggregate expression"
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 453);
  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())((Adjustments.empty()) ? static_cast<void> (0) : __assert_fail
 ("Adjustments.empty()", "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 481, __PRETTY_FUNCTION__));
    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() &&((LV.isSimple() && "materialized temporary field is not a simple lvalue"
) ? static_cast<void> (0) : __assert_fail ("LV.isSimple() && \"materialized temporary field is not a simple lvalue\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 575, __PRETTY_FUNCTION__))
           "materialized temporary field is not a simple lvalue")((LV.isSimple() && "materialized temporary field is not a simple lvalue"
) ? static_cast<void> (0) : __assert_fail ("LV.isSimple() && \"materialized temporary field is not a simple lvalue\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 575, __PRETTY_FUNCTION__));
    Object = LV.getAddress();
    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);
590}

592RValue
593CodeGenFunction::EmitReferenceBindingToExpr(const Expr *E) {
// Emit the expression as an lvalue.
LValue LV = EmitLValue(E);
assert(LV.isSimple())((LV.isSimple()) ? static_cast<void> (0) : __assert_fail
 ("LV.isSimple()", "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 596, __PRETTY_FUNCTION__));
llvm::Value *Value = LV.getPointer();

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);
610}


613/// getAccessedFieldNo - Given an encoded value and a result number, return the
614/// input field number being accessed.
615unsigned CodeGenFunction::getAccessedFieldNo(unsigned Idx,
                                           const llvm::Constant *Elts) {
return cast<llvm::ConstantInt>(Elts->getAggregateElement(Idx))
    ->getZExtValue();
619}

621/// Emit the hash_16_bytes function from include/llvm/ADT/Hashing.h.
622static 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);
631}

633bool CodeGenFunction::isNullPointerAllowed(TypeCheckKind TCK) {
return TCK == TCK_DowncastPointer || TCK == TCK_Upcast ||
       TCK == TCK_UpcastToVirtualBase || TCK == TCK_DynamicOperation;
636}

638bool 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);
644}

646bool CodeGenFunction::sanitizePerformTypeCheck() const {
return SanOpts.has(SanitizerKind::Null) |
       SanOpts.has(SanitizerKind::Alignment) |
       SanOpts.has(SanitizerKind::ObjectSize) |
       SanOpts.has(SanitizerKind::Vptr);
651}

653void 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)((!AlignVal || (uint64_t)1 << llvm::Log2_64(AlignVal) ==
 AlignVal) ? static_cast<void> (0) : __assert_fail ("!AlignVal || (uint64_t)1 << llvm::Log2_64(AlignVal) == AlignVal"
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 763, __PRETTY_FUNCTION__));
  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);
}
854}

856/// Determine whether this expression refers to a flexible array member in a
857/// struct. We disable array bounds checks for such members.
858static 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;
884}

886llvm::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")((LocalDeclMap.count(PassedSizeDecl) && "Passed size not loadable"
) ? static_cast<void> (0) : __assert_fail ("LocalDeclMap.count(PassedSizeDecl) && \"Passed size not loadable\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 916, __PRETTY_FUNCTION__));
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);
923}

925/// If Base is known to point to the start of an array, return the length of
926/// that array. Return 0 if the length cannot be determined.
927static 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;
957}

959void CodeGenFunction::EmitBoundsCheck(const Expr *E, const Expr *Base,
                                    llvm::Value *Index, QualType IndexType,
                                    bool Accessed) {
assert(SanOpts.has(SanitizerKind::ArrayBounds) &&((SanOpts.has(SanitizerKind::ArrayBounds) && "should not be called unless adding bounds checks"
) ? static_cast<void> (0) : __assert_fail ("SanOpts.has(SanitizerKind::ArrayBounds) && \"should not be called unless adding bounds checks\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 963, __PRETTY_FUNCTION__))
       "should not be called unless adding bounds checks")((SanOpts.has(SanitizerKind::ArrayBounds) && "should not be called unless adding bounds checks"
) ? static_cast<void> (0) : __assert_fail ("SanOpts.has(SanitizerKind::ArrayBounds) && \"should not be called unless adding bounds checks\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 963, __PRETTY_FUNCTION__));
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);
984}


987CodeGenFunction::ComplexPairTy CodeGenFunction::
988EmitComplexPrePostIncDec(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 this is a postinc, return the value read from memory, otherwise use the
// updated value.
return isPre ? IncVal : InVal;
1018}

1020void 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());
1028}

1030//===----------------------------------------------------------------------===//
1031//                         LValue Expression Emission
1032//===----------------------------------------------------------------------===//

1034/// EmitPointerWithAlignment - Given an expression of pointer type, try to
1035/// derive a more accurate bound on the alignment of the pointer.
1036Address 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()->isPointerType() || E->getType()->
isObjCObjectPointerType()) ? static_cast<void> (0) : __assert_fail
 ("E->getType()->isPointerType() || E->getType()->isObjCObjectPointerType()"
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 1041, __PRETTY_FUNCTION__))
       E->getType()->isObjCObjectPointerType())((E->getType()->isPointerType() || E->getType()->
isObjCObjectPointerType()) ? static_cast<void> (0) : __assert_fail
 ("E->getType()->isPointerType() || E->getType()->isObjCObjectPointerType()"
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 1041, __PRETTY_FUNCTION__));
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();
  }
}

// TODO: conditional operators, comma.

// Otherwise, use the alignment of the type.
CharUnits Align = getNaturalPointeeTypeAlignment(E->getType(), BaseInfo,
                                                 TBAAInfo);
return Address(EmitScalarExpr(E), Align);
1142}

1144RValue 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")::llvm::llvm_unreachable_internal("bad evaluation kind", "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 1167);
1168}

1170RValue CodeGenFunction::EmitUnsupportedRValue(const Expr *E,
                                            const char *Name) {
ErrorUnsupported(E, Name);
return GetUndefRValue(E->getType());
1174}

1176LValue 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());
1182}

1184bool 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;
1205}

1207LValue 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(),
                E->getType(), LV.getAlignment(), SkippedChecks);
}
return LV;
1226}

1228/// EmitLValue - Emit code to compute a designator that specifies the location
1229/// of the expression.
1230///
1231/// This can return one of two things: a simple address or a bitfield reference.
1232/// In either case, the LLVM Value* in the LValue structure is guaranteed to be
1233/// an LLVM pointer type.
1234///
1235/// If this returns a bitfield reference, nothing about the pointee type of the
1236/// LLVM value is known: For example, it may not be a pointer to an integer.
1237///
1238/// If this returns a normal address, and if the lvalue's C type is fixed size,
1239/// this method guarantees that the returned pointer type will point to an LLVM
1240/// type of the same size of the lvalue's type.  If the lvalue has a variable
1241/// length type, this is not possible.
1242///
1243LValue CodeGenFunction::EmitLValue(const Expr *E) {
ApplyDebugLocation DL(*this, E);
switch (E->getStmtClass()) {
11
←
Control jumps to 'case SubstNonTypeTemplateParmExprClass:'  at line 1359→
14
←
Control jumps to 'case ImplicitCastExprClass:'  at line 1361→
default: return EmitUnsupportedLValue(E, "l-value expression");

case Expr::ObjCPropertyRefExprClass:
  llvm_unreachable("cannot emit a property reference directly")::llvm::llvm_unreachable_internal("cannot emit a property reference directly"
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 1249);

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();
    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());
12
←
'E' is a 'SubstNonTypeTemplateParmExpr'→
13
←
Calling 'CodeGenFunction::EmitLValue'→
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));
15
←
'E' is a 'CastExpr'→
16
←
Calling 'CodeGenFunction::EmitCastLValue'→

case Expr::MaterializeTemporaryExprClass:
  return EmitMaterializeTemporaryExpr(cast<MaterializeTemporaryExpr>(E));

case Expr::CoawaitExprClass:
  return EmitCoawaitLValue(cast<CoawaitExpr>(E));
case Expr::CoyieldExprClass:
  return EmitCoyieldLValue(cast<CoyieldExpr>(E));
}
1379}

1381/// Given an object of the given canonical type, can we safely copy a
1382/// value out of it based on its initializer?
1383static bool isConstantEmittableObjectType(QualType type) {
assert(type.isCanonical())((type.isCanonical()) ? static_cast<void> (0) : __assert_fail
 ("type.isCanonical()", "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 1384, __PRETTY_FUNCTION__));
assert(!type->isReferenceType())((!type->isReferenceType()) ? static_cast<void> (0) :
 __assert_fail ("!type->isReferenceType()", "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 1385, __PRETTY_FUNCTION__));

// 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;
1399}

1401/// Can we constant-emit a load of a reference to a variable of the
1402/// given type?  This is different from predicates like
1403/// Decl::mightBeUsableInConstantExpressions because we do want it to apply
1404/// in situations that don't necessarily satisfy the language's rules
1405/// for this (e.g. C++'s ODR-use rules).  For example, we want to able
1406/// to do this with const float variables even if those variables
1407/// aren't marked 'constexpr'.
1408enum ConstantEmissionKind {
CEK_None,
CEK_AsReferenceOnly,
CEK_AsValueOrReference,
CEK_AsValueOnly
1413};
1414static 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;
1424}

1426/// Try to emit a reference to the given value without producing it as
1427/// an l-value.  This is just an optimization, but it avoids us needing
1428/// to emit global copies of variables if they're named without triggering
1429/// a formal use in a context where we can't emit a direct reference to them,
1430/// for instance if a block or lambda or a member of a local class uses a
1431/// const int variable or constexpr variable from an enclosing function.
1432CodeGenFunction::ConstantEmission
1433CodeGenFunction::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))((isa<EnumConstantDecl>(value)) ? static_cast<void>
 (0) : __assert_fail ("isa<EnumConstantDecl>(value)", "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 1484, __PRETTY_FUNCTION__));
  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);
1493}

1495static 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;
1505}

1507CodeGenFunction::ConstantEmission
1508CodeGenFunction::tryEmitAsConstant(const MemberExpr *ME) {
if (DeclRefExpr *DRE = tryToConvertMemberExprToDeclRefExpr(*this, ME))
  return tryEmitAsConstant(DRE);
return ConstantEmission();
1512}

1514llvm::Value *CodeGenFunction::emitScalarConstant(
  const CodeGenFunction::ConstantEmission &Constant, Expr *E) {
assert(Constant && "not a constant")((Constant && "not a constant") ? static_cast<void
> (0) : __assert_fail ("Constant && \"not a constant\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 1516, __PRETTY_FUNCTION__));
if (Constant.isReference())
  return EmitLoadOfLValue(Constant.getReferenceLValue(*this, E),
                          E->getExprLoc())
      .getScalarVal();
return Constant.getValue();
1522}

1524llvm::Value *CodeGenFunction::EmitLoadOfScalar(LValue lvalue,
                                             SourceLocation Loc) {
return EmitLoadOfScalar(lvalue.getAddress(), lvalue.isVolatile(),
                        lvalue.getType(), Loc, lvalue.getBaseInfo(),
                        lvalue.getTBAAInfo(), lvalue.isNontemporal());
1529}

1531static 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;
1542}

1544static 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)((NumBits <= Bitwidth) ? static_cast<void> (0) : __assert_fail
 ("NumBits <= Bitwidth", "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 1565, __PRETTY_FUNCTION__));
    End = llvm::APInt(Bitwidth, 1) << (NumBits - 1);
    Min = -End;
  } else {
    assert(NumPositiveBits <= Bitwidth)((NumPositiveBits <= Bitwidth) ? static_cast<void> (
0) : __assert_fail ("NumPositiveBits <= Bitwidth", "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 1569, __PRETTY_FUNCTION__));
    End = llvm::APInt(Bitwidth, 1) << NumPositiveBits;
    Min = llvm::APInt(Bitwidth, 0);
  }
}
return true;
1575}

1577llvm::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);
1585}

1587bool 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;
1632}

1634llvm::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);
1689}

1691llvm::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)) &&((Value->getType()->isIntegerTy(getContext().getTypeSize
(Ty)) && "wrong value rep of bool") ? static_cast<
void> (0) : __assert_fail ("Value->getType()->isIntegerTy(getContext().getTypeSize(Ty)) && \"wrong value rep of bool\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 1699, __PRETTY_FUNCTION__))
         "wrong value rep of bool")((Value->getType()->isIntegerTy(getContext().getTypeSize
(Ty)) && "wrong value rep of bool") ? static_cast<
void> (0) : __assert_fail ("Value->getType()->isIntegerTy(getContext().getTypeSize(Ty)) && \"wrong value rep of bool\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 1699, __PRETTY_FUNCTION__));
}

return Value;
1703}

1705llvm::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)) &&((Value->getType()->isIntegerTy(getContext().getTypeSize
(Ty)) && "wrong value rep of bool") ? static_cast<
void> (0) : __assert_fail ("Value->getType()->isIntegerTy(getContext().getTypeSize(Ty)) && \"wrong value rep of bool\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 1709, __PRETTY_FUNCTION__))
         "wrong value rep of bool")((Value->getType()->isIntegerTy(getContext().getTypeSize
(Ty)) && "wrong value rep of bool") ? static_cast<
void> (0) : __assert_fail ("Value->getType()->isIntegerTy(getContext().getTypeSize(Ty)) && \"wrong value rep of bool\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 1709, __PRETTY_FUNCTION__));
  return Builder.CreateTrunc(Value, Builder.getInt1Ty(), "tobool");
}

return Value;
1714}

1716void 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);
1762}

1764void CodeGenFunction::EmitStoreOfScalar(llvm::Value *value, LValue lvalue,
                                      bool isInit) {
EmitStoreOfScalar(value, lvalue.getAddress(), lvalue.isVolatile(),
                  lvalue.getType(), lvalue.getBaseInfo(),
                  lvalue.getTBAAInfo(), isInit, lvalue.isNontemporal());
1769}

1771/// EmitLoadOfLValue - Given an expression that represents a value lvalue, this
1772/// method emits the address of the lvalue, then loads the result as an rvalue,
1773/// returning the rvalue.
1774RValue CodeGenFunction::EmitLoadOfLValue(LValue LV, SourceLocation Loc) {
if (LV.isObjCWeak()) {
  // load of a __weak object.
  Address AddrWeakObj = LV.getAddress();
  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()));
  }

  // In ARC mode, we load retained and then consume the value.
  llvm::Value *Object = EmitARCLoadWeakRetained(LV.getAddress());
  Object = EmitObjCConsumeObject(LV.getType(), Object);
  return RValue::get(Object);
}

if (LV.isSimple()) {
  assert(!LV.getType()->isFunctionType())((!LV.getType()->isFunctionType()) ? static_cast<void>
 (0) : __assert_fail ("!LV.getType()->isFunctionType()", "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 1794, __PRETTY_FUNCTION__));

  // 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!")((LV.isBitField() && "Unknown LValue type!") ? static_cast
<void> (0) : __assert_fail ("LV.isBitField() && \"Unknown LValue type!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 1816, __PRETTY_FUNCTION__));
return EmitLoadOfBitfieldLValue(LV, Loc);
1818}

1820RValue 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)((static_cast<unsigned>(Info.Offset + Info.Size) <= Info
.StorageSize) ? static_cast<void> (0) : __assert_fail (
"static_cast<unsigned>(Info.Offset + Info.Size) <= Info.StorageSize"
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 1831, __PRETTY_FUNCTION__));
  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);
1848}

1850// If this is a reference to a subset of the elements of a vector, create an
1851// appropriate shufflevector.
1852RValue 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);
1878}

1880/// Generates lvalue for partial ext_vector access.
1881Address CodeGenFunction::EmitExtVectorElementLValue(LValue LV) {
Address VectorAddress = LV.getExtVectorAddress();
const VectorType *ExprVT = LV.getType()->getAs<VectorType>();
QualType EQT = ExprVT->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;
1899}

1901/// Load of global gamed gegisters are always calls to intrinsics.
1902RValue CodeGenFunction::EmitLoadOfGlobalRegLValue(LValue LV) {
assert((LV.getType()->isIntegerType() || LV.getType()->isPointerType()) &&(((LV.getType()->isIntegerType() || LV.getType()->isPointerType
()) && "Bad type for register variable") ? static_cast
<void> (0) : __assert_fail ("(LV.getType()->isIntegerType() || LV.getType()->isPointerType()) && \"Bad type for register variable\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 1904, __PRETTY_FUNCTION__))
       "Bad type for register variable")(((LV.getType()->isIntegerType() || LV.getType()->isPointerType
()) && "Bad type for register variable") ? static_cast
<void> (0) : __assert_fail ("(LV.getType()->isIntegerType() || LV.getType()->isPointerType()) && \"Bad type for register variable\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 1904, __PRETTY_FUNCTION__));
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);
1921}


1924/// EmitStoreThroughLValue - Store the specified rvalue into the specified
1925/// lvalue, where both are guaranteed to the have the same type, and that type
1926/// is 'Ty'.
1927void 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")((Dst.isBitField() && "Unknown LValue type") ? static_cast
<void> (0) : __assert_fail ("Dst.isBitField() && \"Unknown LValue type\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 1949, __PRETTY_FUNCTION__));
  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")::llvm::llvm_unreachable_internal("present but none", "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 1957);

  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(), Src.getScalarVal());
    else
      EmitARCStoreWeak(Dst.getAddress(), 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();
  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();
  llvm::Value *src = Src.getScalarVal();
  if (Dst.isObjCIvar()) {
    assert(Dst.getBaseIvarExp() && "BaseIvarExp is NULL")((Dst.getBaseIvarExp() && "BaseIvarExp is NULL") ? static_cast
<void> (0) : __assert_fail ("Dst.getBaseIvarExp() && \"BaseIvarExp is NULL\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 2000, __PRETTY_FUNCTION__));
    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")((Src.isScalar() && "Can't emit an agg store with this method"
) ? static_cast<void> (0) : __assert_fail ("Src.isScalar() && \"Can't emit an agg store with this method\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 2020, __PRETTY_FUNCTION__));
EmitStoreOfScalar(Src.getScalarVal(), Dst, isInit);
2022}

2024void 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.")((Info.StorageSize > Info.Size && "Invalid bitfield size."
) ? static_cast<void> (0) : __assert_fail ("Info.StorageSize > Info.Size && \"Invalid bitfield size.\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 2041, __PRETTY_FUNCTION__));
  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)((Info.Offset == 0) ? static_cast<void> (0) : __assert_fail
 ("Info.Offset == 0", "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 2065, __PRETTY_FUNCTION__));
}

// 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)((Info.Size <= Info.StorageSize) ? static_cast<void>
 (0) : __assert_fail ("Info.Size <= Info.StorageSize", "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 2077, __PRETTY_FUNCTION__));
    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());
}
2089}

2091void 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")::llvm::llvm_unreachable_internal("unexpected shorten vector length"
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 2148);
  }
} 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());
2159}

2161/// Store of global named registers are always calls to intrinsics.
2162void CodeGenFunction::EmitStoreThroughGlobalRegLValue(RValue Src, LValue Dst) {
assert((Dst.getType()->isIntegerType() || Dst.getType()->isPointerType()) &&(((Dst.getType()->isIntegerType() || Dst.getType()->isPointerType
()) && "Bad type for register variable") ? static_cast
<void> (0) : __assert_fail ("(Dst.getType()->isIntegerType() || Dst.getType()->isPointerType()) && \"Bad type for register variable\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 2164, __PRETTY_FUNCTION__))
       "Bad type for register variable")(((Dst.getType()->isIntegerType() || Dst.getType()->isPointerType
()) && "Bad type for register variable") ? static_cast
<void> (0) : __assert_fail ("(Dst.getType()->isIntegerType() || Dst.getType()->isPointerType()) && \"Bad type for register variable\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 2164, __PRETTY_FUNCTION__));
llvm::MDNode *RegName = cast<llvm::MDNode>(
    cast<llvm::MetadataAsValue>(Dst.getGlobalReg())->getMetadata());
assert(RegName && "Register LValue is not metadata")((RegName && "Register LValue is not metadata") ? static_cast
<void> (0) : __assert_fail ("RegName && \"Register LValue is not metadata\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 2167, __PRETTY_FUNCTION__));

// 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});
2182}

2184// setObjCGCLValueClass - sets class of the lvalue for the purpose of
2185// generating write-barries API. It is currently a global, ivar,
2186// or neither.
2187static 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;
}
2282}

2284static llvm::Value *
2285EmitBitCastOfLValueToProperType(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);
2290}

2292static 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);
2298}

2300static 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_Link) || (*Res == OMPDeclareTargetDeclAttr
::MT_To && CGF.CGM.getOpenMPRuntime().hasRequiresUnifiedSharedMemory
())) && "Expected link clause OR to clause with unified memory enabled."
) ? static_cast<void> (0) : __assert_fail ("((*Res == OMPDeclareTargetDeclAttr::MT_Link) || (*Res == OMPDeclareTargetDeclAttr::MT_To && CGF.CGM.getOpenMPRuntime().hasRequiresUnifiedSharedMemory())) && \"Expected link clause OR to clause with unified memory enabled.\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 2313, __PRETTY_FUNCTION__))
        (*Res == OMPDeclareTargetDeclAttr::MT_To &&((((*Res == OMPDeclareTargetDeclAttr::MT_Link) || (*Res == OMPDeclareTargetDeclAttr
::MT_To && CGF.CGM.getOpenMPRuntime().hasRequiresUnifiedSharedMemory
())) && "Expected link clause OR to clause with unified memory enabled."
) ? static_cast<void> (0) : __assert_fail ("((*Res == OMPDeclareTargetDeclAttr::MT_Link) || (*Res == OMPDeclareTargetDeclAttr::MT_To && CGF.CGM.getOpenMPRuntime().hasRequiresUnifiedSharedMemory())) && \"Expected link clause OR to clause with unified memory enabled.\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 2313, __PRETTY_FUNCTION__))
         CGF.CGM.getOpenMPRuntime().hasRequiresUnifiedSharedMemory())) &&((((*Res == OMPDeclareTargetDeclAttr::MT_Link) || (*Res == OMPDeclareTargetDeclAttr
::MT_To && CGF.CGM.getOpenMPRuntime().hasRequiresUnifiedSharedMemory
())) && "Expected link clause OR to clause with unified memory enabled."
) ? static_cast<void> (0) : __assert_fail ("((*Res == OMPDeclareTargetDeclAttr::MT_Link) || (*Res == OMPDeclareTargetDeclAttr::MT_To && CGF.CGM.getOpenMPRuntime().hasRequiresUnifiedSharedMemory())) && \"Expected link clause OR to clause with unified memory enabled.\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 2313, __PRETTY_FUNCTION__))
       "Expected link clause OR to clause with unified memory enabled.")((((*Res == OMPDeclareTargetDeclAttr::MT_Link) || (*Res == OMPDeclareTargetDeclAttr
::MT_To && CGF.CGM.getOpenMPRuntime().hasRequiresUnifiedSharedMemory
())) && "Expected link clause OR to clause with unified memory enabled."
) ? static_cast<void> (0) : __assert_fail ("((*Res == OMPDeclareTargetDeclAttr::MT_Link) || (*Res == OMPDeclareTargetDeclAttr::MT_To && CGF.CGM.getOpenMPRuntime().hasRequiresUnifiedSharedMemory())) && \"Expected link clause OR to clause with unified memory enabled.\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 2313, __PRETTY_FUNCTION__));
QualType PtrTy = CGF.getContext().getPointerType(VD->getType());
Address Addr = CGF.CGM.getOpenMPRuntime().getAddrOfDeclareTargetVar(VD);
return CGF.EmitLoadOfPointer(Addr, PtrTy->castAs<PointerType>());
2317}

2319Address
2320CodeGenFunction::EmitLoadOfReference(LValue RefLVal,
                                   LValueBaseInfo *PointeeBaseInfo,
                                   TBAAAccessInfo *PointeeTBAAInfo) {
llvm::LoadInst *Load = Builder.CreateLoad(RefLVal.getAddress(),
                                          RefLVal.isVolatile());
CGM.DecorateInstructionWithTBAA(Load, RefLVal.getTBAAInfo());

CharUnits Align = getNaturalTypeAlignment(RefLVal.getType()->getPointeeType(),
                                          PointeeBaseInfo, PointeeTBAAInfo,
                                          /* forPointeeType= */ true);
return Address(Load, Align);
2331}

2333LValue CodeGenFunction::EmitLoadOfReferenceLValue(LValue RefLVal) {
LValueBaseInfo PointeeBaseInfo;
TBAAAccessInfo PointeeTBAAInfo;
Address PointeeAddr = EmitLoadOfReference(RefLVal, &PointeeBaseInfo,
                                          &PointeeTBAAInfo);
return MakeAddrLValue(PointeeAddr, RefLVal.getType()->getPointeeType(),
                      PointeeBaseInfo, PointeeTBAAInfo);
2340}

2342Address 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));
2350}

2352LValue 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);
2358}

2360static 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;
2394}

2396static 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;
2418}

2420static 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);
2426}

2428static 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);
2433}

2435/// Named Registers are named metadata pointing to the register name
2436/// which will be read from/written to as an argument to the intrinsic
2437/// @llvm.read/write_register.
2438/// So far, only the name is being passed down, but other options such as
2439/// register type, allocation type or even optimization options could be
2440/// passed down via the metadata node.
2441static 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() &&((Asm->getLabel().size() < 64-Name.size() && "Register name too big"
) ? static_cast<void> (0) : __assert_fail ("Asm->getLabel().size() < 64-Name.size() && \"Register name too big\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 2445, __PRETTY_FUNCTION__))
    "Register name too big")((Asm->getLabel().size() < 64-Name.size() && "Register name too big"
) ? static_cast<void> (0) : __assert_fail ("Asm->getLabel().size() < 64-Name.size() && \"Register name too big\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 2445, __PRETTY_FUNCTION__));
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());
2461}

2463/// Determine whether we can emit a reference to \p VD from the current
2464/// context, despite not necessarily having seen an odr-use of the variable in
2465/// this context.
2466static 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;
}
2512}

2514LValue CodeGenFunction::EmitDeclRefLValue(const DeclRefExpr *E) {
const NamedDecl *ND = E->getDecl();
QualType T = E->getType();

assert(E->isNonOdrUse() != NOUR_Unevaluated &&((E->isNonOdrUse() != NOUR_Unevaluated && "should not emit an unevaluated operand"
) ? static_cast<void> (0) : __assert_fail ("E->isNonOdrUse() != NOUR_Unevaluated && \"should not emit an unevaluated operand\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 2519, __PRETTY_FUNCTION__))
       "should not emit an unevaluated operand")((E->isNonOdrUse() != NOUR_Unevaluated && "should not emit an unevaluated operand"
) ? static_cast<void> (0) : __assert_fail ("E->isNonOdrUse() != NOUR_Unevaluated && \"should not emit an unevaluated operand\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 2519, __PRETTY_FUNCTION__));

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")((Val && "failed to emit constant expression") ? static_cast
<void> (0) : __assert_fail ("Val && \"failed to emit constant expression\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 2537, __PRETTY_FUNCTION__));

    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);
    else if (CapturedStmtInfo) {
      auto I = LocalDeclMap.find(VD);
      if (I != LocalDeclMap.end()) {
        if (VD->getType()->isReferenceType())
          return EmitLoadOfReferenceLValue(I->second, VD->getType(),
                                           AlignmentSource::Decl);
        return MakeAddrLValue(I->second, T);
      }
      LValue CapLVal =
          EmitCapturedFieldLValue(*this, CapturedStmtInfo->lookup(VD),
                                  CapturedStmtInfo->getContextValue());
      return MakeAddrLValue(
          Address(CapLVal.getPointer(), getContext().getDeclAlign(VD)),
          CapLVal.getType(), LValueBaseInfo(AlignmentSource::Decl),
          CapLVal.getTBAAInfo());
    }

    assert(isa<BlockDecl>(CurCodeDecl))((isa<BlockDecl>(CurCodeDecl)) ? static_cast<void>
 (0) : __assert_fail ("isa<BlockDecl>(CurCodeDecl)", "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 2585, __PRETTY_FUNCTION__));
    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() ||(((ND->isUsed(false) || !isa<VarDecl>(ND) || E->isNonOdrUse
() || !E->getLocation().isValid()) && "Should not use decl without marking it used!"
) ? static_cast<void> (0) : __assert_fail ("(ND->isUsed(false) || !isa<VarDecl>(ND) || E->isNonOdrUse() || !E->getLocation().isValid()) && \"Should not use decl without marking it used!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 2596, __PRETTY_FUNCTION__))
        !E->getLocation().isValid()) &&(((ND->isUsed(false) || !isa<VarDecl>(ND) || E->isNonOdrUse
() || !E->getLocation().isValid()) && "Should not use decl without marking it used!"
) ? static_cast<void> (0) : __assert_fail ("(ND->isUsed(false) || !isa<VarDecl>(ND) || E->isNonOdrUse() || !E->getLocation().isValid()) && \"Should not use decl without marking it used!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 2596, __PRETTY_FUNCTION__))
       "Should not use decl without marking it used!")(((ND->isUsed(false) || !isa<VarDecl>(ND) || E->isNonOdrUse
() || !E->getLocation().isValid()) && "Should not use decl without marking it used!"
) ? static_cast<void> (0) : __assert_fail ("(ND->isUsed(false) || !isa<VarDecl>(ND) || E->isNonOdrUse() || !E->getLocation().isValid()) && \"Should not use decl without marking it used!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 2596, __PRETTY_FUNCTION__));

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?")::llvm::llvm_unreachable_internal("DeclRefExpr for Decl not entered in LocalDeclMap?"
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 2625);
  }


  // 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")::llvm::llvm_unreachable_internal("Unhandled DeclRefExpr", "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 2675);
2676}

2678LValue 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!")::llvm::llvm_unreachable_internal("Unknown unary operator lvalue!"
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 2685);
case UO_Deref: {
  QualType T = E->getSubExpr()->getType()->getPointeeType();
  assert(!T.isNull() && "CodeGenFunction::EmitUnaryOpLValue: Illegal type")((!T.isNull() && "CodeGenFunction::EmitUnaryOpLValue: Illegal type"
) ? static_cast<void> (0) : __assert_fail ("!T.isNull() && \"CodeGenFunction::EmitUnaryOpLValue: Illegal type\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 2688, __PRETTY_FUNCTION__));

  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")((LV.isSimple() && "real/imag on non-ordinary l-value"
) ? static_cast<void> (0) : __assert_fail ("LV.isSimple() && \"real/imag on non-ordinary l-value\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 2710, __PRETTY_FUNCTION__));

  // __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().getElementType()->isStructTy()) {
    assert(E->getSubExpr()->getType()->isArithmeticType())((E->getSubExpr()->getType()->isArithmeticType()) ? static_cast
<void> (0) : __assert_fail ("E->getSubExpr()->getType()->isArithmeticType()"
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 2716, __PRETTY_FUNCTION__));
    return LV;
  }

  QualType T = ExprTy->castAs<ComplexType>()->getElementType();

  Address Component =
    (E->getOpcode() == UO_Real
       ? emitAddrOfRealComponent(LV.getAddress(), LV.getType())
       : emitAddrOfImagComponent(LV.getAddress(), 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;
}
}
2743}

2745LValue CodeGenFunction::EmitStringLiteralLValue(const StringLiteral *E) {
return MakeAddrLValue(CGM.GetAddrOfConstantStringFromLiteral(E),
                      E->getType(), AlignmentSource::Decl);
2748}

2750LValue CodeGenFunction::EmitObjCEncodeExprLValue(const ObjCEncodeExpr *E) {
return MakeAddrLValue(CGM.GetAddrOfConstantStringFromObjCEncode(E),
                      E->getType(), AlignmentSource::Decl);
2753}

2755LValue CodeGenFunction::EmitPredefinedLValue(const PredefinedExpr *E) {
auto SL = E->getFunctionName();
assert(SL != nullptr && "No StringLiteral name in PredefinedExpr")((SL != nullptr && "No StringLiteral name in PredefinedExpr"
) ? static_cast<void> (0) : __assert_fail ("SL != nullptr && \"No StringLiteral name in PredefinedExpr\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 2757, __PRETTY_FUNCTION__));
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);
2780}

2782/// Emit a type description suitable for use by a runtime sanitizer library. The
2783/// format of a type descriptor is
2784///
2785/// \code
2786///   { i16 TypeKind, i16 TypeInfo }
2787/// \endcode
2788///
2789/// followed by an array of i8 containing the type name. TypeKind is 0 for an
2790/// integer, 1 for a floating point value, and -1 for anything else.
2791llvm::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;
2832}

2834llvm::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);
2861}

2863/// Emit a representation of a SourceLocation for passing to a handler
2864/// in a sanitizer runtime library. The format for this data is:
2865/// \code
2866///   struct SourceLocation {
2867///     const char *Filename;
2868///     int32_t Line, Column;
2869///   };
2870/// \endcode
2871/// For an invalid SourceLocation, the Filename pointer is null.
2872llvm::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)((PathComponentsToStrip != (-2147483647 -1)) ? static_cast<
void> (0) : __assert_fail ("PathComponentsToStrip != INT_MIN"
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 2883, __PRETTY_FUNCTION__));
    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);
2919}

2921namespace {
2922/// Specify under what conditions this check can be recovered
2923enum 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
2931};
2932}

2934static CheckRecoverableKind getRecoverableKind(SanitizerMask Kind) {
assert(Kind.countPopulation() == 1)((Kind.countPopulation() == 1) ? static_cast<void> (0) :
 __assert_fail ("Kind.countPopulation() == 1", "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 2935, __PRETTY_FUNCTION__));
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;
2942}

2944namespace {
2945struct SanitizerHandlerInfo {
char const *const Name;
unsigned Version;
2948};
2949}

2951const SanitizerHandlerInfo SanitizerHandlers[] = {
2952#define SANITIZER_CHECK(Enum, Name, Version) {#Name, Version},
  LIST_SANITIZER_CHECKSSANITIZER_CHECK(AddOverflow, add_overflow, 0) SANITIZER_CHECK
(BuiltinUnreachable, builtin_unreachable, 0) SANITIZER_CHECK(
CFICheckFail, cfi_check_fail, 0) SANITIZER_CHECK(DivremOverflow
, divrem_overflow, 0) SANITIZER_CHECK(DynamicTypeCacheMiss, dynamic_type_cache_miss
, 0) SANITIZER_CHECK(FloatCastOverflow, float_cast_overflow, 0
) SANITIZER_CHECK(FunctionTypeMismatch, function_type_mismatch
, 1) SANITIZER_CHECK(ImplicitConversion, implicit_conversion,
 0) SANITIZER_CHECK(InvalidBuiltin, invalid_builtin, 0) SANITIZER_CHECK
(LoadInvalidValue, load_invalid_value, 0) SANITIZER_CHECK(MissingReturn
, missing_return, 0) SANITIZER_CHECK(MulOverflow, mul_overflow
, 0) SANITIZER_CHECK(NegateOverflow, negate_overflow, 0) SANITIZER_CHECK
(NullabilityArg, nullability_arg, 0) SANITIZER_CHECK(NullabilityReturn
, nullability_return, 1) SANITIZER_CHECK(NonnullArg, nonnull_arg
, 0) SANITIZER_CHECK(NonnullReturn, nonnull_return, 1) SANITIZER_CHECK
(OutOfBounds, out_of_bounds, 0) SANITIZER_CHECK(PointerOverflow
, pointer_overflow, 0) SANITIZER_CHECK(ShiftOutOfBounds, shift_out_of_bounds
, 0) SANITIZER_CHECK(SubOverflow, sub_overflow, 0) SANITIZER_CHECK
(TypeMismatch, type_mismatch, 1) SANITIZER_CHECK(AlignmentAssumption
, alignment_assumption, 0) SANITIZER_CHECK(VLABoundNotPositive
, vla_bound_not_positive, 0)
2954#undef SANITIZER_CHECK
2955};

2957static 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)((IsFatal || RecoverKind != CheckRecoverableKind::Unrecoverable
) ? static_cast<void> (0) : __assert_fail ("IsFatal || RecoverKind != CheckRecoverableKind::Unrecoverable"
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 2963, __PRETTY_FUNCTION__));
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);
}
3003}

3005void CodeGenFunction::EmitCheck(
  ArrayRef<std::pair<llvm::Value *, SanitizerMask>> Checked,
  SanitizerHandler CheckHandler, ArrayRef<llvm::Constant *> StaticArgs,
  ArrayRef<llvm::Value *> DynamicArgs) {
assert(IsSanitizerScope)((IsSanitizerScope) ? static_cast<void> (0) : __assert_fail
 ("IsSanitizerScope", "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 3009, __PRETTY_FUNCTION__));
assert(Checked.size() > 0)((Checked.size() > 0) ? static_cast<void> (0) : __assert_fail
 ("Checked.size() > 0", "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 3010, __PRETTY_FUNCTION__));
assert(CheckHandler >= 0 &&((CheckHandler >= 0 && size_t(CheckHandler) < llvm
::array_lengthof(SanitizerHandlers)) ? static_cast<void>
 (0) : __assert_fail ("CheckHandler >= 0 && size_t(CheckHandler) < llvm::array_lengthof(SanitizerHandlers)"
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 3012, __PRETTY_FUNCTION__))
       size_t(CheckHandler) < llvm::array_lengthof(SanitizerHandlers))((CheckHandler >= 0 && size_t(CheckHandler) < llvm
::array_lengthof(SanitizerHandlers)) ? static_cast<void>
 (0) : __assert_fail ("CheckHandler >= 0 && size_t(CheckHandler) < llvm::array_lengthof(SanitizerHandlers)"
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 3012, __PRETTY_FUNCTION__));
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)((JointCond) ? static_cast<void> (0) : __assert_fail ("JointCond"
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 3040, __PRETTY_FUNCTION__));

CheckRecoverableKind RecoverKind = getRecoverableKind(Checked[0].second);
assert(SanOpts.has(Checked[0].second))((SanOpts.has(Checked[0].second)) ? static_cast<void> (
0) : __assert_fail ("SanOpts.has(Checked[0].second)", "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 3043, __PRETTY_FUNCTION__));
3044#ifndef NDEBUG
for (int i = 1, n = Checked.size(); i < n; ++i) {
  assert(RecoverKind == getRecoverableKind(Checked[i].second) &&((RecoverKind == getRecoverableKind(Checked[i].second) &&
 "All recoverable kinds in a single check must be same!") ? static_cast
<void> (0) : __assert_fail ("RecoverKind == getRecoverableKind(Checked[i].second) && \"All recoverable kinds in a single check must be same!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 3047, __PRETTY_FUNCTION__))
         "All recoverable kinds in a single check must be same!")((RecoverKind == getRecoverableKind(Checked[i].second) &&
 "All recoverable kinds in a single check must be same!") ? static_cast
<void> (0) : __assert_fail ("RecoverKind == getRecoverableKind(Checked[i].second) && \"All recoverable kinds in a single check must be same!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 3047, __PRETTY_FUNCTION__));
  assert(SanOpts.has(Checked[i].second))((SanOpts.has(Checked[i].second)) ? static_cast<void> (
0) : __assert_fail ("SanOpts.has(Checked[i].second)", "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 3048, __PRETTY_FUNCTION__));
}
3050#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);
3113}

3115void 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);
3159}

3161// Emit a stub for __cfi_check function so that the linker knows about this
3162// symbol in LTO mode.
3163void 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);
3178}

3180// This function is basically a switch over the CFI failure kind, which is
3181// extracted from CFICheckFailData (1st function argument). Each case is either
3182// llvm.trap or a call to one of the two runtime handlers, based on
3183// -fsanitize-trap and -fsanitize-recover settings.  Default case (invalid
3184// failure kind) traps, but this should really never happen.  CFICheckFailData
3185// can be nullptr if the calling module has -fsanitize-trap behavior for this
3186// check kind; in this case __cfi_check_fail traps as well.
3187void 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());
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);
3269}

3271void 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();
3280}

3282void 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);
3300}

3302llvm::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;
3312}

3314Address CodeGenFunction::EmitArrayToPointerDecay(const Expr *E,
                                               LValueBaseInfo *BaseInfo,
                                               TBAAAccessInfo *TBAAInfo) {
assert(E->getType()->isArrayType() &&((E->getType()->isArrayType() && "Array to pointer decay must have array source type!"
) ? static_cast<void> (0) : __assert_fail ("E->getType()->isArrayType() && \"Array to pointer decay must have array source type!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 3318, __PRETTY_FUNCTION__))
       "Array to pointer decay must have array source type!")((E->getType()->isArrayType() && "Array to pointer decay must have array source type!"
) ? static_cast<void> (0) : __assert_fail ("E->getType()->isArrayType() && \"Array to pointer decay must have array source type!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 3318, __PRETTY_FUNCTION__));

// Expressions of array type can't be bitfields or vector elements.
LValue LV = EmitLValue(E);
Address Addr = LV.getAddress();

// 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()) &&((isa<llvm::ArrayType>(Addr.getElementType()) &&
 "Expected pointer to array") ? static_cast<void> (0) :
 __assert_fail ("isa<llvm::ArrayType>(Addr.getElementType()) && \"Expected pointer to array\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 3333, __PRETTY_FUNCTION__))
         "Expected pointer to array")((isa<llvm::ArrayType>(Addr.getElementType()) &&
 "Expected pointer to array") ? static_cast<void> (0) :
 __assert_fail ("isa<llvm::ArrayType>(Addr.getElementType()) && \"Expected pointer to array\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 3333, __PRETTY_FUNCTION__));
  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));
3347}

3349/// isSimpleArrayDecayOperand - If the specified expr is a simple decay from an
3350/// array to pointer, return the array subexpression.
3351static 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;
3363}

3365static 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);
}
3379}

3381static 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);
}
3394}

3396static QualType getFixedSizeElementType(const ASTContext &ctx,
                                      const VariableArrayType *vla) {
QualType eltType;
do {
  eltType = vla->getElementType();
} while ((vla = ctx.getAsVariableArrayType(eltType)));
return eltType;
3403}

3405static Address emitArraySubscriptGEP(CodeGenFunction &CGF, Address addr,
                                   ArrayRef<llvm::Value *> indices,
                                   QualType eltType, bool inbounds,
                                   bool signedIndices, SourceLocation loc,
                                   QualType *arrayType = nullptr,
                                   const llvm::Twine &name = "arrayidx") {
// All the indices except that last must be zero.
3412#ifndef NDEBUG
for (auto idx : indices.drop_back())
  assert(isa<llvm::ConstantInt>(idx) &&((isa<llvm::ConstantInt>(idx) && cast<llvm::
ConstantInt>(idx)->isZero()) ? static_cast<void> (
0) : __assert_fail ("isa<llvm::ConstantInt>(idx) && cast<llvm::ConstantInt>(idx)->isZero()"
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 3415, __PRETTY_FUNCTION__))
         cast<llvm::ConstantInt>(idx)->isZero())((isa<llvm::ConstantInt>(idx) && cast<llvm::
ConstantInt>(idx)->isZero()) ? static_cast<void> (
0) : __assert_fail ("isa<llvm::ConstantInt>(idx) && cast<llvm::ConstantInt>(idx)->isZero()"
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 3415, __PRETTY_FUNCTION__));
3416#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 (!CGF.IsInPreservedAIRegion || !LastIndex) {
  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);
3448}

3450LValue 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")((E->getRHS() == E->getIdx() && "index was neither LHS nor RHS"
) ? static_cast<void> (0) : __assert_fail ("E->getRHS() == E->getIdx() && \"index was neither LHS nor RHS\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 3460, __PRETTY_FUNCTION__));
    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!")((LHS.isSimple() && "Can only subscript lvalue vectors here!"
) ? static_cast<void> (0) : __assert_fail ("LHS.isSimple() && \"Can only subscript lvalue vectors here!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 3486, __PRETTY_FUNCTION__));
  return LValue::MakeVectorElt(LHS.getAddress(), 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->getType()->isArrayType() && "Array to pointer decay must have array source type!"
) ? static_cast<void> (0) : __assert_fail ("Array->getType()->isArrayType() && \"Array to pointer decay must have array source type!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 3570, __PRETTY_FUNCTION__))
         "Array to pointer decay must have array source type!")((Array->getType()->isArrayType() && "Array to pointer decay must have array source type!"
) ? static_cast<void> (0) : __assert_fail ("Array->getType()->isArrayType() && \"Array to pointer decay must have array source type!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 3570, __PRETTY_FUNCTION__));
  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(), {CGM.getSize(CharUnits::Zero()), Idx},
      E->getType(), !getLangOpts().isSignedOverflowDefined(), SignedIndices,
      E->getExprLoc(), &arrayType);
  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);
}

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;
3606}

3608static 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();
    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()) &&((isa<llvm::ArrayType>(Addr.getElementType()) &&
 "Expected pointer to array") ? static_cast<void> (0) :
 __assert_fail ("isa<llvm::ArrayType>(Addr.getElementType()) && \"Expected pointer to array\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 3629, __PRETTY_FUNCTION__))
             "Expected pointer to array")((isa<llvm::ArrayType>(Addr.getElementType()) &&
 "Expected pointer to array") ? static_cast<void> (0) :
 __assert_fail ("isa<llvm::ArrayType>(Addr.getElementType()) && \"Expected pointer to array\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 3629, __PRETTY_FUNCTION__));
      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()), Align);
}
return CGF.EmitPointerWithAlignment(Base, &BaseInfo, &TBAAInfo);
3645}

3647LValue 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)((Idx) ? static_cast<void> (0) : __assert_fail ("Idx", "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 3740, __PRETTY_FUNCTION__));

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->getType()->isArrayType() && "Array to pointer decay must have array source type!"
) ? static_cast<void> (0) : __assert_fail ("Array->getType()->isArrayType() && \"Array to pointer decay must have array source type!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 3772, __PRETTY_FUNCTION__))
         "Array to pointer decay must have array source type!")((Array->getType()->isArrayType() && "Array to pointer decay must have array source type!"
) ? static_cast<void> (0) : __assert_fail ("Array->getType()->isArrayType() && \"Array to pointer decay must have array source type!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 3772, __PRETTY_FUNCTION__));
  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(), {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);
3798}

3800LValue CodeGenFunction::
3801EmitExtVectorElementExpr(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 PointerType *PT = E->getBase()->getType()->getAs<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())((E->getBase()->getType()->isVectorType()) ? static_cast
<void> (0) : __assert_fail ("E->getBase()->getType()->isVectorType()"
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 3818, __PRETTY_FUNCTION__));
  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() &&((E->getBase()->getType()->isVectorType() &&
 "Result must be a vector") ? static_cast<void> (0) : __assert_fail
 ("E->getBase()->getType()->isVectorType() && \"Result must be a vector\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 3823, __PRETTY_FUNCTION__))
         "Result must be a vector")((E->getBase()->getType()->isVectorType() &&
 "Result must be a vector") ? static_cast<void> (0) : __assert_fail
 ("E->getBase()->getType()->isVectorType() && \"Result must be a vector\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 3823, __PRETTY_FUNCTION__));
  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(), CV, type,
                                  Base.getBaseInfo(), TBAAAccessInfo());
}
assert(Base.isExtVectorElt() && "Can only subscript lvalue vec elts here!")((Base.isExtVectorElt() && "Can only subscript lvalue vec elts here!"
) ? static_cast<void> (0) : __assert_fail ("Base.isExtVectorElt() && \"Can only subscript lvalue vec elts here!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 3846, __PRETTY_FUNCTION__));

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());
3856}

3858LValue 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);
  return LV;
}

if (const auto *FD = dyn_cast<FunctionDecl>(ND))
  return EmitFunctionDeclLValue(*this, E, FD);

llvm_unreachable("Unhandled member declaration!")::llvm::llvm_unreachable_internal("Unhandled member declaration!"
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 3894);
3895}

3897/// Given that we are currently emitting a lambda, emit an l-value for
3898/// one of its members.
3899LValue CodeGenFunction::EmitLValueForLambdaField(const FieldDecl *Field) {
assert(cast<CXXMethodDecl>(CurCodeDecl)->getParent()->isLambda())((cast<CXXMethodDecl>(CurCodeDecl)->getParent()->
isLambda()) ? static_cast<void> (0) : __assert_fail ("cast<CXXMethodDecl>(CurCodeDecl)->getParent()->isLambda()"
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 3900, __PRETTY_FUNCTION__));
assert(cast<CXXMethodDecl>(CurCodeDecl)->getParent() == Field->getParent())((cast<CXXMethodDecl>(CurCodeDecl)->getParent() == Field
->getParent()) ? static_cast<void> (0) : __assert_fail
 ("cast<CXXMethodDecl>(CurCodeDecl)->getParent() == Field->getParent()"
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 3901, __PRETTY_FUNCTION__));
QualType LambdaTagType =
  getContext().getTagDeclType(Field->getParent());
LValue LambdaLV = MakeNaturalAlignAddrLValue(CXXABIThisValue, LambdaTagType);
return EmitLValueForField(LambdaLV, Field);
3906}

3908/// Get the field index in the debug info. The debug info structure/union
3909/// will ignore the unnamed bitfields.
3910unsigned 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;
3923}

3925/// Get the address of a zero-sized field within a record. The resulting
3926/// address doesn't necessarily have the right type.
3927static 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);
3935}

3937/// Drill down to the storage of a field without walking into
3938/// reference types.
3939///
3940/// The resulting address doesn't necessarily have the right type.
3941static 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());
3952}

3954static 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);
3965}

3967static 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;
3984}

3986LValue 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();
  unsigned Idx = RL.getLLVMFieldNo(field);
  if (!IsInPreservedAIRegion) {
    if (Idx != 0)
      // For structs, we GEP to the field that the record layout suggests.
      Addr = Builder.CreateStructGEP(Addr, Idx, field->getName());
  } else {
    const RecordDecl *rec = field->getParent();
    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 &&((!FieldTBAAInfo.Offset && "Nonzero offset for an access with no base type!"
) ? static_cast<void> (0) : __assert_fail ("!FieldTBAAInfo.Offset && \"Nonzero offset for an access with no base type!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 4044, __PRETTY_FUNCTION__))
             "Nonzero offset for an access with no base type!")((!FieldTBAAInfo.Offset && "Nonzero offset for an access with no base type!"
) ? static_cast<void> (0) : __assert_fail ("!FieldTBAAInfo.Offset && \"Nonzero offset for an access with no base type!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 4044, __PRETTY_FUNCTION__));
  }

  // 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();
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) {
    // 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)
    // 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;
4137}

4139LValue
4140CodeGenFunction::EmitLValueForFieldInitialization(LValue Base,
                                                const FieldDecl *Field) {
QualType FieldType = Field->getType();

if (!FieldType->isReferenceType())
  return EmitLValueForField(Base, Field);

Address V = emitAddrOfFieldStorage(*this, Base.getAddress(), 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));
4161}

4163LValue 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;
4180}

4182LValue 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")((E->isTransparent() && "non-transparent glvalue init list"
) ? static_cast<void> (0) : __assert_fail ("E->isTransparent() && \"non-transparent glvalue init list\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 4188, __PRETTY_FUNCTION__));
return EmitLValue(E->getInit(0));
4190}

4192/// Emit the operand of a glvalue conditional operator. This is either a glvalue
4193/// or a (possibly-parenthesized) throw-expression. If this is a throw, no
4194/// LValue is returned and the current block has been terminated.
4195static 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);
4203}

4205LValue CodeGenFunction::
4206EmitConditionalOperatorLValue(const AbstractConditionalOperator *expr) {
if (!expr->isGLValue()) {
  // ?: here should be an aggregate.
  assert(hasAggregateEvaluationKind(expr->getType()) &&((hasAggregateEvaluationKind(expr->getType()) && "Unexpected conditional operator!"
) ? static_cast<void> (0) : __assert_fail ("hasAggregateEvaluationKind(expr->getType()) && \"Unexpected conditional operator!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 4210, __PRETTY_FUNCTION__))
         "Unexpected conditional operator!")((hasAggregateEvaluationKind(expr->getType()) && "Unexpected conditional operator!"
) ? static_cast<void> (0) : __assert_fail ("hasAggregateEvaluationKind(expr->getType()) && \"Unexpected conditional operator!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 4210, __PRETTY_FUNCTION__));
  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()->getType(),
                                         2, "cond-lvalue");
  phi->addIncoming(lhs->getPointer(), lhsBlock);
  phi->addIncoming(rhs->getPointer(), 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) &&(((lhs || rhs) && "both operands of glvalue conditional are throw-expressions?"
) ? static_cast<void> (0) : __assert_fail ("(lhs || rhs) && \"both operands of glvalue conditional are throw-expressions?\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 4279, __PRETTY_FUNCTION__))
         "both operands of glvalue conditional are throw-expressions?")(((lhs || rhs) && "both operands of glvalue conditional are throw-expressions?"
) ? static_cast<void> (0) : __assert_fail ("(lhs || rhs) && \"both operands of glvalue conditional are throw-expressions?\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 4279, __PRETTY_FUNCTION__));
  return lhs ? *lhs : *rhs;
}
4282}

4284/// EmitCastLValue - Casts are never lvalues unless that cast is to a reference
4285/// type. If the cast is to a reference, we can have the usual lvalue result,
4286/// otherwise if a cast is needed by the code generator in an lvalue context,
4287/// then it must mean that we need the address of an aggregate in order to
4288/// access one of its members.  This can happen for all the reasons that casts
4289/// are permitted with aggregate result, including noop aggregate casts, and
4290/// cast from scalar to union.
4291LValue CodeGenFunction::EmitCastLValue(const CastExpr *E) {
switch (E->getCastKind()) {
17
←
Control jumps to 'case CK_BaseToDerived:'  at line 4386→
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!")::llvm::llvm_unreachable_internal("dependent cast kind in IR gen!"
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 4339);

case CK_BuiltinFnToFnPtr:
  llvm_unreachable("builtin functions are handled elsewhere")::llvm::llvm_unreachable_internal("builtin functions are handled elsewhere"
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 4342);

// 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();
  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 RecordType *DerivedClassTy =
    E->getSubExpr()->getType()->getAs<RecordType>();
  auto *DerivedClassDecl = cast<CXXRecordDecl>(DerivedClassTy->getDecl());

  LValue LV = EmitLValue(E->getSubExpr());
  Address This = LV.getAddress();

  // 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 RecordType *DerivedClassTy = E->getType()->getAs<RecordType>();
18
←
Assuming the object is not a 'RecordType'→
19
←
'DerivedClassTy' initialized to a null pointer value→
  auto *DerivedClassDecl = cast<CXXRecordDecl>(DerivedClassTy->getDecl());
20
←
Called C++ object pointer is null

  LValue LV = EmitLValue(E->getSubExpr());

  // Perform the base-to-derived conversion
  Address Derived =
    GetAddressOfDerivedClass(LV.getAddress(), 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(),
                                    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(), E->getSubExpr()->getType().getAddressSpace(),
      E->getType().getAddressSpace(), ConvertType(DestTy));
  return MakeAddrLValue(Address(V, LV.getAddress().getAlignment()),
                        E->getType(), LV.getBaseInfo(), LV.getTBAAInfo());
}
case CK_ObjCObjectLValueCast: {
  LValue LV = EmitLValue(E->getSubExpr());
  Address V = Builder.CreateElementBitCast(LV.getAddress(),
                                           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::llvm_unreachable_internal("NULL to OpenCL opaque type lvalue cast is not valid"
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 4446);
}

llvm_unreachable("Unhandled lvalue cast kind?")::llvm::llvm_unreachable_internal("Unhandled lvalue cast kind?"
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 4449);
4450}

4452LValue CodeGenFunction::EmitOpaqueValueLValue(const OpaqueValueExpr *e) {
assert(OpaqueValueMappingData::shouldBindAsLValue(e))((OpaqueValueMappingData::shouldBindAsLValue(e)) ? static_cast
<void> (0) : __assert_fail ("OpaqueValueMappingData::shouldBindAsLValue(e)"
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 4453, __PRETTY_FUNCTION__));
return getOrCreateOpaqueLValueMapping(e);
4455}

4457LValue
4458CodeGenFunction::getOrCreateOpaqueLValueMapping(const OpaqueValueExpr *e) {
assert(OpaqueValueMapping::shouldBindAsLValue(e))((OpaqueValueMapping::shouldBindAsLValue(e)) ? static_cast<
void> (0) : __assert_fail ("OpaqueValueMapping::shouldBindAsLValue(e)"
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 4459, __PRETTY_FUNCTION__));

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")((e->isUnique() && "LValue for a nonunique OVE hasn't been emitted"
) ? static_cast<void> (0) : __assert_fail ("e->isUnique() && \"LValue for a nonunique OVE hasn't been emitted\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 4467, __PRETTY_FUNCTION__));
return EmitLValue(e->getSourceExpr());
4469}

4471RValue
4472CodeGenFunction::getOrCreateOpaqueRValueMapping(const OpaqueValueExpr *e) {
assert(!OpaqueValueMapping::shouldBindAsLValue(e))((!OpaqueValueMapping::shouldBindAsLValue(e)) ? static_cast<
void> (0) : __assert_fail ("!OpaqueValueMapping::shouldBindAsLValue(e)"
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 4473, __PRETTY_FUNCTION__));

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")((e->isUnique() && "RValue for a nonunique OVE hasn't been emitted"
) ? static_cast<void> (0) : __assert_fail ("e->isUnique() && \"RValue for a nonunique OVE hasn't been emitted\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 4481, __PRETTY_FUNCTION__));
return EmitAnyExpr(e->getSourceExpr());
4483}

4485RValue 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();
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());
  return EmitLoadOfLValue(FieldLV, Loc);
}
llvm_unreachable("bad evaluation kind")::llvm::llvm_unreachable_internal("bad evaluation kind", "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 4502);
4503}

4505//===--------------------------------------------------------------------===//
4506//                             Expression Emission
4507//===--------------------------------------------------------------------===//

4509RValue 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);
4538}

4540/// Emit a CallExpr without considering whether it might be a subclass.
4541RValue CodeGenFunction::EmitSimpleCallExpr(const CallExpr *E,
                                         ReturnValueSlot ReturnValue) {
CGCallee Callee = EmitCallee(E->getCallee());
return EmitCall(E->getCallee()->getType(), Callee, E, ReturnValue);
4545}

4547static CGCallee EmitDirectCallee(CodeGenFunction &CGF, const FunctionDecl *FD) {
if (auto builtinID = FD->getBuiltinID()) {
  return CGCallee::forBuiltin(builtinID, FD);
}

llvm::Constant *calleePtr = EmitFunctionDeclPointer(CGF.CGM, FD);
return CGCallee::forDirect(calleePtr, GlobalDecl(FD));
4554}

4556CGCallee 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();
}
assert(functionType->isFunctionType())((functionType->isFunctionType()) ? static_cast<void>
 (0) : __assert_fail ("functionType->isFunctionType()", "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 4596, __PRETTY_FUNCTION__));

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;
4606}

4608LValue 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")((E->getOpcode() == BO_Assign && "unexpected binary l-value"
) ? static_cast<void> (0) : __assert_fail ("E->getOpcode() == BO_Assign && \"unexpected binary l-value\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 4620, __PRETTY_FUNCTION__));

// 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);
  return LV;
}

case TEK_Complex:
  return EmitComplexAssignmentLValue(E);

case TEK_Aggregate:
  return EmitAggExprToLValue(E);
}
llvm_unreachable("bad evaluation kind")::llvm::llvm_unreachable_internal("bad evaluation kind", "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 4655);
4656}

4658LValue 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() &&((E->getCallReturnType(getContext())->isReferenceType()
 && "Can't have a scalar return unless the return type is a "
 "reference type!") ? static_cast<void> (0) : __assert_fail
 ("E->getCallReturnType(getContext())->isReferenceType() && \"Can't have a scalar return unless the return type is a \" \"reference type!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 4667, __PRETTY_FUNCTION__))
       "Can't have a scalar return unless the return type is a "((E->getCallReturnType(getContext())->isReferenceType()
 && "Can't have a scalar return unless the return type is a "
 "reference type!") ? static_cast<void> (0) : __assert_fail
 ("E->getCallReturnType(getContext())->isReferenceType() && \"Can't have a scalar return unless the return type is a \" \"reference type!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 4667, __PRETTY_FUNCTION__))
       "reference type!")((E->getCallReturnType(getContext())->isReferenceType()
 && "Can't have a scalar return unless the return type is a "
 "reference type!") ? static_cast<void> (0) : __assert_fail
 ("E->getCallReturnType(getContext())->isReferenceType() && \"Can't have a scalar return unless the return type is a \" \"reference type!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 4667, __PRETTY_FUNCTION__));

return MakeNaturalAlignPointeeAddrLValue(RV.getScalarVal(), E->getType());
4670}

4672LValue CodeGenFunction::EmitVAArgExprLValue(const VAArgExpr *E) {
// FIXME: This shouldn't require another copy.
return EmitAggExprToLValue(E);
4675}

4677LValue CodeGenFunction::EmitCXXConstructLValue(const CXXConstructExpr *E) {
assert(E->getType()->getAsCXXRecordDecl()->hasTrivialDestructor()((E->getType()->getAsCXXRecordDecl()->hasTrivialDestructor
() && "binding l-value to type which needs a temporary"
) ? static_cast<void> (0) : __assert_fail ("E->getType()->getAsCXXRecordDecl()->hasTrivialDestructor() && \"binding l-value to type which needs a temporary\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 4679, __PRETTY_FUNCTION__))
       && "binding l-value to type which needs a temporary")((E->getType()->getAsCXXRecordDecl()->hasTrivialDestructor
() && "binding l-value to type which needs a temporary"
) ? static_cast<void> (0) : __assert_fail ("E->getType()->getAsCXXRecordDecl()->hasTrivialDestructor() && \"binding l-value to type which needs a temporary\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 4679, __PRETTY_FUNCTION__));
AggValueSlot Slot = CreateAggTemp(E->getType());
EmitCXXConstructExpr(E, Slot);
return MakeAddrLValue(Slot.getAddress(), E->getType(), AlignmentSource::Decl);
4683}

4685LValue
4686CodeGenFunction::EmitCXXTypeidLValue(const CXXTypeidExpr *E) {
return MakeNaturalAlignAddrLValue(EmitCXXTypeidExpr(E), E->getType());
4688}

4690Address CodeGenFunction::EmitCXXUuidofExpr(const CXXUuidofExpr *E) {
return Builder.CreateElementBitCast(CGM.GetAddrOfUuidDescriptor(E),
                                    ConvertType(E->getType()));
4693}

4695LValue CodeGenFunction::EmitCXXUuidofLValue(const CXXUuidofExpr *E) {
return MakeAddrLValue(EmitCXXUuidofExpr(E), E->getType(),
                      AlignmentSource::Decl);
4698}

4700LValue
4701CodeGenFunction::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);
4707}

4709LValue 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() &&((E->getMethodDecl()->getReturnType()->isReferenceType
() && "Can't have a scalar return unless the return type is a "
 "reference type!") ? static_cast<void> (0) : __assert_fail
 ("E->getMethodDecl()->getReturnType()->isReferenceType() && \"Can't have a scalar return unless the return type is a \" \"reference type!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 4718, __PRETTY_FUNCTION__))
       "Can't have a scalar return unless the return type is a "((E->getMethodDecl()->getReturnType()->isReferenceType
() && "Can't have a scalar return unless the return type is a "
 "reference type!") ? static_cast<void> (0) : __assert_fail
 ("E->getMethodDecl()->getReturnType()->isReferenceType() && \"Can't have a scalar return unless the return type is a \" \"reference type!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 4718, __PRETTY_FUNCTION__))
       "reference type!")((E->getMethodDecl()->getReturnType()->isReferenceType
() && "Can't have a scalar return unless the return type is a "
 "reference type!") ? static_cast<void> (0) : __assert_fail
 ("E->getMethodDecl()->getReturnType()->isReferenceType() && \"Can't have a scalar return unless the return type is a \" \"reference type!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 4718, __PRETTY_FUNCTION__));

return MakeNaturalAlignPointeeAddrLValue(RV.getScalarVal(), E->getType());
4721}

4723LValue CodeGenFunction::EmitObjCSelectorLValue(const ObjCSelectorExpr *E) {
Address V =
  CGM.getObjCRuntime().GetAddrOfSelector(*this, E->getSelector());
return MakeAddrLValue(V, E->getType(), AlignmentSource::Decl);
4727}

4729llvm::Value *CodeGenFunction::EmitIvarOffset(const ObjCInterfaceDecl *Interface,
                                           const ObjCIvarDecl *Ivar) {
return CGM.getObjCRuntime().EmitIvarOffset(*this, Interface, Ivar);
4732}

4734LValue CodeGenFunction::EmitLValueForIvar(QualType ObjectTy,
                                        llvm::Value *BaseValue,
                                        const ObjCIvarDecl *Ivar,
                                        unsigned CVRQualifiers) {
return CGM.getObjCRuntime().EmitObjCValueForIvar(*this, ObjectTy, BaseValue,
                                                 Ivar, CVRQualifiers);
4740}

4742LValue 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();
  ObjectTy = BaseExpr->getType();
  BaseQuals = ObjectTy.getQualifiers();
}

LValue LV =
  EmitLValueForIvar(ObjectTy, BaseValue, E->getDecl(),
                    BaseQuals.getCVRQualifiers());
setObjCGCLValueClass(getContext(), E, LV);
return LV;
4764}

4766LValue 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);
4771}

4773RValue 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() &&((CalleeType->isFunctionPointerType() && "Call must have function pointer type!"
) ? static_cast<void> (0) : __assert_fail ("CalleeType->isFunctionPointerType() && \"Call must have function pointer type!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 4779, __PRETTY_FUNCTION__))
       "Call must have function pointer type!")((CalleeType->isFunctionPointerType() && "Call must have function pointer type!"
) ? static_cast<void> (0) : __assert_fail ("CalleeType->isFunctionPointerType() && \"Call must have function pointer type!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 4779, __PRETTY_FUNCTION__));

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;
4956}

4958LValue CodeGenFunction::
4959EmitPointerToDataMemberBinaryExpr(const BinaryOperator *E) {
Address BaseAddr = Address::invalid();
if (E->getOpcode() == BO_PtrMemI) {
  BaseAddr = EmitPointerWithAlignment(E->getLHS());
} else {
  BaseAddr = EmitLValue(E->getLHS()).getAddress();
}

llvm::Value *OffsetV = EmitScalarExpr(E->getRHS());

const MemberPointerType *MPT
  = E->getRHS()->getType()->getAs<MemberPointerType>();

LValueBaseInfo BaseInfo;
TBAAAccessInfo TBAAInfo;
Address MemberAddr =
  EmitCXXMemberDataPointerAddress(E, BaseAddr, OffsetV, MPT, &BaseInfo,
                                  &TBAAInfo);

return MakeAddrLValue(MemberAddr, MPT->getPointeeType(), BaseInfo, TBAAInfo);
4979}

4981/// Given the address of a temporary variable, produce an r-value of
4982/// its type.
4983RValue 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();
case TEK_Scalar:
  return RValue::get(EmitLoadOfScalar(lvalue, loc));
}
llvm_unreachable("bad evaluation kind")::llvm::llvm_unreachable_internal("bad evaluation kind", "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 4995);
4996}

4998void CodeGenFunction::SetFPAccuracy(llvm::Value *Val, float Accuracy) {
assert(Val->getType()->isFPOrFPVectorTy())((Val->getType()->isFPOrFPVectorTy()) ? static_cast<
void> (0) : __assert_fail ("Val->getType()->isFPOrFPVectorTy()"
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 4999, __PRETTY_FUNCTION__));
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);
5007}

5009namespace {
struct LValueOrRValue {
  LValue LV;
  RValue RV;
};
5014}

5016static 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
3
←
Loop condition is true.  Entering loop body→
       i = E->semantics_begin(), e = E->semantics_end(); i != e; ++i) {
2
←
Assuming 'i' is not equal to 'e'→
  const Expr *semantic = *i;

  // If this semantic expression is an opaque value, bind it
  // to the result of its source expression.
  if (const auto *ov4.1
'ov' is null
 = dyn_cast<OpaqueValueExpr>(semantic)) {
4
←
Assuming 'semantic' is not a 'OpaqueValueExpr'→
5
←
Taking false branch→
    // Skip unique OVEs.
    if (ov->isUnique()) {
      assert(ov != resultExpr &&((ov != resultExpr && "A unique OVE cannot be used as the result expression"
) ? static_cast<void> (0) : __assert_fail ("ov != resultExpr && \"A unique OVE cannot be used as the result expression\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 5036, __PRETTY_FUNCTION__))
             "A unique OVE cannot be used as the result expression")((ov != resultExpr && "A unique OVE cannot be used as the result expression"
) ? static_cast<void> (0) : __assert_fail ("ov != resultExpr && \"A unique OVE cannot be used as the result expression\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 5036, __PRETTY_FUNCTION__));
      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) {
6
←
Assuming 'semantic' is not equal to 'resultExpr'→
7
←
Taking false branch→
    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);
8
←
Calling 'CodeGenFunction::EmitIgnoredExpr'→
  }
}

// Unbind all the opaques now.
for (unsigned i = 0, e = opaques.size(); i != e; ++i)
  opaques[i].unbind(CGF);

return result;
5086}

5088RValue CodeGenFunction::EmitPseudoObjectRValue(const PseudoObjectExpr *E,
                                             AggValueSlot slot) {
return emitPseudoObjectExpr(*this, E, false, slot).RV;
1
Calling 'emitPseudoObjectExpr'→
5091}

5093LValue CodeGenFunction::EmitPseudoObjectLValue(const PseudoObjectExpr *E) {
return emitPseudoObjectExpr(*this, E, true, AggValueSlot::ignored()).LV;
5095}