text: //===-- CodeGenFunction.h - Per-Function state for LLVM CodeGen -*- C++ -*-===//
  //
  // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
  // See https://llvm.org/LICENSE.txt for license information.
  // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
  //
  //===----------------------------------------------------------------------===//
  //
  // This is the internal per-function state used for llvm translation.
  //
  //===----------------------------------------------------------------------===//
  
  #ifndef LLVM_CLANG_LIB_CODEGEN_CODEGENFUNCTION_H
  #define LLVM_CLANG_LIB_CODEGEN_CODEGENFUNCTION_H
  
  #include "CGBuilder.h"
  #include "CGDebugInfo.h"
  #include "CGLoopInfo.h"
  #include "CGValue.h"
  #include "CodeGenModule.h"
  #include "CodeGenPGO.h"
  #include "EHScopeStack.h"
  #include "VarBypassDetector.h"
  #include "clang/AST/CharUnits.h"
  #include "clang/AST/CurrentSourceLocExprScope.h"
  #include "clang/AST/ExprCXX.h"
  #include "clang/AST/ExprObjC.h"
  #include "clang/AST/ExprOpenMP.h"
  #include "clang/AST/StmtOpenMP.h"
  #include "clang/AST/Type.h"
  #include "clang/Basic/ABI.h"
  #include "clang/Basic/CapturedStmt.h"
  #include "clang/Basic/CodeGenOptions.h"
  #include "clang/Basic/OpenMPKinds.h"
  #include "clang/Basic/TargetInfo.h"
  #include "llvm/ADT/ArrayRef.h"
  #include "llvm/ADT/DenseMap.h"
  #include "llvm/ADT/MapVector.h"
  #include "llvm/ADT/SmallVector.h"
  #include "llvm/Frontend/OpenMP/OMPIRBuilder.h"
  #include "llvm/IR/ValueHandle.h"
  #include "llvm/Support/Debug.h"
  #include "llvm/Transforms/Utils/SanitizerStats.h"
  
  namespace llvm {
  class BasicBlock;
  class LLVMContext;
  class MDNode;
  class Module;
  class SwitchInst;
  class Twine;
  class Value;
  class CanonicalLoopInfo;
  }
  
  namespace clang {
  class ASTContext;
  class BlockDecl;
  class CXXDestructorDecl;
  class CXXForRangeStmt;
  class CXXTryStmt;
  class Decl;
  class LabelDecl;
  class EnumConstantDecl;
  class FunctionDecl;
  class FunctionProtoType;
  class LabelStmt;
  class ObjCContainerDecl;
  class ObjCInterfaceDecl;
  class ObjCIvarDecl;
  class ObjCMethodDecl;
  class ObjCImplementationDecl;
  class ObjCPropertyImplDecl;
  class TargetInfo;
  class VarDecl;
  class ObjCForCollectionStmt;
  class ObjCAtTryStmt;
  class ObjCAtThrowStmt;
  class ObjCAtSynchronizedStmt;
  class ObjCAutoreleasePoolStmt;
  class OMPUseDevicePtrClause;
  class OMPUseDeviceAddrClause;
  class ReturnsNonNullAttr;
  class SVETypeFlags;
  class OMPExecutableDirective;
  
  namespace analyze_os_log {
  class OSLogBufferLayout;
  }
  
  namespace CodeGen {
  class CodeGenTypes;
  class CGCallee;
  class CGFunctionInfo;
  class CGRecordLayout;
  class CGBlockInfo;
  class CGCXXABI;
  class BlockByrefHelpers;
  class BlockByrefInfo;
  class BlockFlags;
  class BlockFieldFlags;
  class RegionCodeGenTy;
  class TargetCodeGenInfo;
  struct OMPTaskDataTy;
  struct CGCoroData;
  
  /// The kind of evaluation to perform on values of a particular
  /// type.  Basically, is the code in CGExprScalar, CGExprComplex, or
  /// CGExprAgg?
  ///
  /// TODO: should vectors maybe be split out into their own thing?
  enum TypeEvaluationKind {
    TEK_Scalar,
    TEK_Complex,
    TEK_Aggregate
  };
  
  #define LIST_SANITIZER_CHECKS                                                  \
    SANITIZER_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(InvalidObjCCast, invalid_objc_cast, 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)
  
  enum SanitizerHandler {
  #define SANITIZER_CHECK(Enum, Name, Version) Enum,
    LIST_SANITIZER_CHECKS
  #undef SANITIZER_CHECK
  };
  
  /// Helper class with most of the code for saving a value for a
  /// conditional expression cleanup.
  struct DominatingLLVMValue {
    typedef llvm::PointerIntPair<llvm::Value*, 1, bool> saved_type;
  
    /// Answer whether the given value needs extra work to be saved.
    static bool needsSaving(llvm::Value *value) {
      // If it's not an instruction, we don't need to save.
      if (!isa<llvm::Instruction>(value)) return false;
  
      // If it's an instruction in the entry block, we don't need to save.
      llvm::BasicBlock *block = cast<llvm::Instruction>(value)->getParent();
      return (block != &block->getParent()->getEntryBlock());
    }
  
    static saved_type save(CodeGenFunction &CGF, llvm::Value *value);
    static llvm::Value *restore(CodeGenFunction &CGF, saved_type value);
  };
  
  /// A partial specialization of DominatingValue for llvm::Values that
  /// might be llvm::Instructions.
  template <class T> struct DominatingPointer<T,true> : DominatingLLVMValue {
    typedef T *type;
    static type restore(CodeGenFunction &CGF, saved_type value) {
      return static_cast<T*>(DominatingLLVMValue::restore(CGF, value));
    }
  };
  
  /// A specialization of DominatingValue for Address.
  template <> struct DominatingValue<Address> {
    typedef Address type;
  
    struct saved_type {
      DominatingLLVMValue::saved_type SavedValue;
      CharUnits Alignment;
    };
  
    static bool needsSaving(type value) {
      return DominatingLLVMValue::needsSaving(value.getPointer());
    }
    static saved_type save(CodeGenFunction &CGF, type value) {
      return { DominatingLLVMValue::save(CGF, value.getPointer()),
               value.getAlignment() };
    }
    static type restore(CodeGenFunction &CGF, saved_type value) {
      return Address(DominatingLLVMValue::restore(CGF, value.SavedValue),
                     value.Alignment);
    }
  };
  
  /// A specialization of DominatingValue for RValue.
  template <> struct DominatingValue<RValue> {
    typedef RValue type;
    class saved_type {
      enum Kind { ScalarLiteral, ScalarAddress, AggregateLiteral,
                  AggregateAddress, ComplexAddress };
  
      llvm::Value *Value;
      unsigned K : 3;
      unsigned Align : 29;
      saved_type(llvm::Value *v, Kind k, unsigned a = 0)
        : Value(v), K(k), Align(a) {}
  
    public:
      static bool needsSaving(RValue value);
      static saved_type save(CodeGenFunction &CGF, RValue value);
      RValue restore(CodeGenFunction &CGF);
  
      // implementations in CGCleanup.cpp
    };
  
    static bool needsSaving(type value) {
      return saved_type::needsSaving(value);
    }
    static saved_type save(CodeGenFunction &CGF, type value) {
      return saved_type::save(CGF, value);
    }
    static type restore(CodeGenFunction &CGF, saved_type value) {
      return value.restore(CGF);
    }
  };
  
  /// CodeGenFunction - This class organizes the per-function state that is used
  /// while generating LLVM code.
  class CodeGenFunction : public CodeGenTypeCache {
    CodeGenFunction(const CodeGenFunction &) = delete;
    void operator=(const CodeGenFunction &) = delete;
  
    friend class CGCXXABI;
  public:
    /// A jump destination is an abstract label, branching to which may
    /// require a jump out through normal cleanups.
    struct JumpDest {
      JumpDest() : Block(nullptr), ScopeDepth(), Index(0) {}
      JumpDest(llvm::BasicBlock *Block,
               EHScopeStack::stable_iterator Depth,
               unsigned Index)
        : Block(Block), ScopeDepth(Depth), Index(Index) {}
  
      bool isValid() const { return Block != nullptr; }
      llvm::BasicBlock *getBlock() const { return Block; }
      EHScopeStack::stable_iterator getScopeDepth() const { return ScopeDepth; }
      unsigned getDestIndex() const { return Index; }
  
      // This should be used cautiously.
      void setScopeDepth(EHScopeStack::stable_iterator depth) {
        ScopeDepth = depth;
      }
  
    private:
      llvm::BasicBlock *Block;
      EHScopeStack::stable_iterator ScopeDepth;
      unsigned Index;
    };
  
    CodeGenModule &CGM;  // Per-module state.
    const TargetInfo &Target;
  
    // For EH/SEH outlined funclets, this field points to parent's CGF
    CodeGenFunction *ParentCGF = nullptr;
  
    typedef std::pair<llvm::Value *, llvm::Value *> ComplexPairTy;
    LoopInfoStack LoopStack;
    CGBuilderTy Builder;
  
    // Stores variables for which we can't generate correct lifetime markers
    // because of jumps.
    VarBypassDetector Bypasses;
  
    /// List of recently emitted OMPCanonicalLoops.
    ///
    /// Since OMPCanonicalLoops are nested inside other statements (in particular
    /// CapturedStmt generated by OMPExecutableDirective and non-perfectly nested
    /// loops), we cannot directly call OMPEmitOMPCanonicalLoop and receive its
    /// llvm::CanonicalLoopInfo. Instead, we call EmitStmt and any
    /// OMPEmitOMPCanonicalLoop called by it will add its CanonicalLoopInfo to
    /// this stack when done. Entering a new loop requires clearing this list; it
    /// either means we start parsing a new loop nest (in which case the previous
    /// loop nest goes out of scope) or a second loop in the same level in which
    /// case it would be ambiguous into which of the two (or more) loops the loop
    /// nest would extend.
    SmallVector<llvm::CanonicalLoopInfo *, 4> OMPLoopNestStack;
  
    // CodeGen lambda for loops and support for ordered clause
    typedef llvm::function_ref<void(CodeGenFunction &, const OMPLoopDirective &,
                                    JumpDest)>
        CodeGenLoopTy;
    typedef llvm::function_ref<void(CodeGenFunction &, SourceLocation,
                                    const unsigned, const bool)>
        CodeGenOrderedTy;
  
    // Codegen lambda for loop bounds in worksharing loop constructs
    typedef llvm::function_ref<std::pair<LValue, LValue>(
        CodeGenFunction &, const OMPExecutableDirective &S)>
        CodeGenLoopBoundsTy;
  
    // Codegen lambda for loop bounds in dispatch-based loop implementation
    typedef llvm::function_ref<std::pair<llvm::Value *, llvm::Value *>(
        CodeGenFunction &, const OMPExecutableDirective &S, Address LB,
        Address UB)>
        CodeGenDispatchBoundsTy;
  
    /// CGBuilder insert helper. This function is called after an
    /// instruction is created using Builder.
    void InsertHelper(llvm::Instruction *I, const llvm::Twine &Name,
                      llvm::BasicBlock *BB,
                      llvm::BasicBlock::iterator InsertPt) const;
  
    /// CurFuncDecl - Holds the Decl for the current outermost
    /// non-closure context.
    const Decl *CurFuncDecl;
    /// CurCodeDecl - This is the inner-most code context, which includes blocks.
    const Decl *CurCodeDecl;
    const CGFunctionInfo *CurFnInfo;
    QualType FnRetTy;
    llvm::Function *CurFn = nullptr;
  
    /// Save Parameter Decl for coroutine.
    llvm::SmallVector<const ParmVarDecl *, 4> FnArgs;
  
    // Holds coroutine data if the current function is a coroutine. We use a
    // wrapper to manage its lifetime, so that we don't have to define CGCoroData
    // in this header.
    struct CGCoroInfo {
      std::unique_ptr<CGCoroData> Data;
      CGCoroInfo();
      ~CGCoroInfo();
    };
    CGCoroInfo CurCoro;
  
    bool isCoroutine() const {
      return CurCoro.Data != nullptr;
    }
  
    /// CurGD - The GlobalDecl for the current function being compiled.
    GlobalDecl CurGD;
  
    /// PrologueCleanupDepth - The cleanup depth enclosing all the
    /// cleanups associated with the parameters.
    EHScopeStack::stable_iterator PrologueCleanupDepth;
  
    /// ReturnBlock - Unified return block.
    JumpDest ReturnBlock;
  
    /// ReturnValue - The temporary alloca to hold the return
    /// value. This is invalid iff the function has no return value.
    Address ReturnValue = Address::invalid();
  
    /// ReturnValuePointer - The temporary alloca to hold a pointer to sret.
    /// This is invalid if sret is not in use.
    Address ReturnValuePointer = Address::invalid();
  
    /// If a return statement is being visited, this holds the return statment's
    /// result expression.
    const Expr *RetExpr = nullptr;
  
    /// Return true if a label was seen in the current scope.
    bool hasLabelBeenSeenInCurrentScope() const {
      if (CurLexicalScope)
        return CurLexicalScope->hasLabels();
      return !LabelMap.empty();
    }
  
    /// AllocaInsertPoint - This is an instruction in the entry block before which
    /// we prefer to insert allocas.
    llvm::AssertingVH<llvm::Instruction> AllocaInsertPt;
  
    /// API for captured statement code generation.
    class CGCapturedStmtInfo {
    public:
      explicit CGCapturedStmtInfo(CapturedRegionKind K = CR_Default)
          : Kind(K), ThisValue(nullptr), CXXThisFieldDecl(nullptr) {}
      explicit CGCapturedStmtInfo(const CapturedStmt &S,
                                  CapturedRegionKind K = CR_Default)
        : Kind(K), ThisValue(nullptr), CXXThisFieldDecl(nullptr) {
  
        RecordDecl::field_iterator Field =
          S.getCapturedRecordDecl()->field_begin();
        for (CapturedStmt::const_capture_iterator I = S.capture_begin(),
                                                  E = S.capture_end();
             I != E; ++I, ++Field) {
          if (I->capturesThis())
            CXXThisFieldDecl = *Field;
          else if (I->capturesVariable())
            CaptureFields[I->getCapturedVar()->getCanonicalDecl()] = *Field;
          else if (I->capturesVariableByCopy())
            CaptureFields[I->getCapturedVar()->getCanonicalDecl()] = *Field;
        }
      }
  
      virtual ~CGCapturedStmtInfo();
  
      CapturedRegionKind getKind() const { return Kind; }
  
      virtual void setContextValue(llvm::Value *V) { ThisValue = V; }
      // Retrieve the value of the context parameter.
      virtual llvm::Value *getContextValue() const { return ThisValue; }
  
      /// Lookup the captured field decl for a variable.
      virtual const FieldDecl *lookup(const VarDecl *VD) const {
        return CaptureFields.lookup(VD->getCanonicalDecl());
      }
  
      bool isCXXThisExprCaptured() const { return getThisFieldDecl() != nullptr; }
      virtual FieldDecl *getThisFieldDecl() const { return CXXThisFieldDecl; }
  
      static bool classof(const CGCapturedStmtInfo *) {
        return true;
      }
  
      /// Emit the captured statement body.
      virtual void EmitBody(CodeGenFunction &CGF, const Stmt *S) {
        CGF.incrementProfileCounter(S);
        CGF.EmitStmt(S);
      }
  
      /// Get the name of the capture helper.
      virtual StringRef getHelperName() const { return "__captured_stmt"; }
  
    private:
      /// The kind of captured statement being generated.
      CapturedRegionKind Kind;
  
      /// Keep the map between VarDecl and FieldDecl.
      llvm::SmallDenseMap<const VarDecl *, FieldDecl *> CaptureFields;
  
      /// The base address of the captured record, passed in as the first
      /// argument of the parallel region function.
      llvm::Value *ThisValue;
  
      /// Captured 'this' type.
      FieldDecl *CXXThisFieldDecl;
    };
    CGCapturedStmtInfo *CapturedStmtInfo = nullptr;
  
    /// RAII for correct setting/restoring of CapturedStmtInfo.
    class CGCapturedStmtRAII {
    private:
      CodeGenFunction &CGF;
      CGCapturedStmtInfo *PrevCapturedStmtInfo;
    public:
      CGCapturedStmtRAII(CodeGenFunction &CGF,
                         CGCapturedStmtInfo *NewCapturedStmtInfo)
          : CGF(CGF), PrevCapturedStmtInfo(CGF.CapturedStmtInfo) {
        CGF.CapturedStmtInfo = NewCapturedStmtInfo;
      }
      ~CGCapturedStmtRAII() { CGF.CapturedStmtInfo = PrevCapturedStmtInfo; }
    };
  
    /// An abstract representation of regular/ObjC call/message targets.
    class AbstractCallee {
      /// The function declaration of the callee.
      const Decl *CalleeDecl;
  
    public:
      AbstractCallee() : CalleeDecl(nullptr) {}
      AbstractCallee(const FunctionDecl *FD) : CalleeDecl(FD) {}
      AbstractCallee(const ObjCMethodDecl *OMD) : CalleeDecl(OMD) {}
      bool hasFunctionDecl() const {
        return dyn_cast_or_null<FunctionDecl>(CalleeDecl);
      }
      const Decl *getDecl() const { return CalleeDecl; }
      unsigned getNumParams() const {
        if (const auto *FD = dyn_cast<FunctionDecl>(CalleeDecl))
          return FD->getNumParams();
        return cast<ObjCMethodDecl>(CalleeDecl)->param_size();
      }
      const ParmVarDecl *getParamDecl(unsigned I) const {
        if (const auto *FD = dyn_cast<FunctionDecl>(CalleeDecl))
          return FD->getParamDecl(I);
        return *(cast<ObjCMethodDecl>(CalleeDecl)->param_begin() + I);
      }
    };
  
    /// Sanitizers enabled for this function.
    SanitizerSet SanOpts;
  
    /// True if CodeGen currently emits code implementing sanitizer checks.
    bool IsSanitizerScope = false;
  
    /// RAII object to set/unset CodeGenFunction::IsSanitizerScope.
    class SanitizerScope {
      CodeGenFunction *CGF;
    public:
      SanitizerScope(CodeGenFunction *CGF);
      ~SanitizerScope();
    };
  
    /// In C++, whether we are code generating a thunk.  This controls whether we
    /// should emit cleanups.
    bool CurFuncIsThunk = false;
  
    /// In ARC, whether we should autorelease the return value.
    bool AutoreleaseResult = false;
  
    /// Whether we processed a Microsoft-style asm block during CodeGen. These can
    /// potentially set the return value.
    bool SawAsmBlock = false;
  
    const NamedDecl *CurSEHParent = nullptr;
  
    /// True if the current function is an outlined SEH helper. This can be a
    /// finally block or filter expression.
    bool IsOutlinedSEHHelper = false;
  
    /// True if CodeGen currently emits code inside presereved access index
    /// region.
    bool IsInPreservedAIRegion = false;
  
    /// True if the current statement has nomerge attribute.
    bool InNoMergeAttributedStmt = false;
  
    // The CallExpr within the current statement that the musttail attribute
    // applies to.  nullptr if there is no 'musttail' on the current statement.
    const CallExpr *MustTailCall = nullptr;
  
    /// Returns true if a function must make progress, which means the
    /// mustprogress attribute can be added.
    bool checkIfFunctionMustProgress() {
      if (CGM.getCodeGenOpts().getFiniteLoops() ==
          CodeGenOptions::FiniteLoopsKind::Never)
        return false;
  
      // C++11 and later guarantees that a thread eventually will do one of the
      // following (6.9.2.3.1 in C++11):
      // - terminate,
      //  - make a call to a library I/O function,
      //  - perform an access through a volatile glvalue, or
      //  - perform a synchronization operation or an atomic operation.
      //
      // Hence each function is 'mustprogress' in C++11 or later.
      return getLangOpts().CPlusPlus11;
    }
  
    /// Returns true if a loop must make progress, which means the mustprogress
    /// attribute can be added. \p HasConstantCond indicates whether the branch
    /// condition is a known constant.
    bool checkIfLoopMustProgress(bool HasConstantCond) {
      if (CGM.getCodeGenOpts().getFiniteLoops() ==
          CodeGenOptions::FiniteLoopsKind::Always)
        return true;
      if (CGM.getCodeGenOpts().getFiniteLoops() ==
          CodeGenOptions::FiniteLoopsKind::Never)
        return false;
  
      // If the containing function must make progress, loops also must make
      // progress (as in C++11 and later).
      if (checkIfFunctionMustProgress())
        return true;
  
      // Now apply rules for plain C (see  6.8.5.6 in C11).
      // Loops with constant conditions do not have to make progress in any C
      // version.
      if (HasConstantCond)
        return false;
  
      // Loops with non-constant conditions must make progress in C11 and later.
      return getLangOpts().C11;
    }
  
    const CodeGen::CGBlockInfo *BlockInfo = nullptr;
    llvm::Value *BlockPointer = nullptr;
  
    llvm::DenseMap<const VarDecl *, FieldDecl *> LambdaCaptureFields;
    FieldDecl *LambdaThisCaptureField = nullptr;
  
    /// A mapping from NRVO variables to the flags used to indicate
    /// when the NRVO has been applied to this variable.
    llvm::DenseMap<const VarDecl *, llvm::Value *> NRVOFlags;
  
    EHScopeStack EHStack;
    llvm::SmallVector<char, 256> LifetimeExtendedCleanupStack;
    llvm::SmallVector<const JumpDest *, 2> SEHTryEpilogueStack;
  
    llvm::Instruction *CurrentFuncletPad = nullptr;
  
    class CallLifetimeEnd final : public EHScopeStack::Cleanup {
      bool isRedundantBeforeReturn() override { return true; }
  
      llvm::Value *Addr;
      llvm::Value *Size;
  
    public:
      CallLifetimeEnd(Address addr, llvm::Value *size)
          : Addr(addr.getPointer()), Size(size) {}
  
      void Emit(CodeGenFunction &CGF, Flags flags) override {
        CGF.EmitLifetimeEnd(Size, Addr);
      }
    };
  
    /// Header for data within LifetimeExtendedCleanupStack.
    struct LifetimeExtendedCleanupHeader {
      /// The size of the following cleanup object.
      unsigned Size;
      /// The kind of cleanup to push: a value from the CleanupKind enumeration.
      unsigned Kind : 31;
      /// Whether this is a conditional cleanup.
      unsigned IsConditional : 1;
  
      size_t getSize() const { return Size; }
      CleanupKind getKind() const { return (CleanupKind)Kind; }
      bool isConditional() const { return IsConditional; }
    };
  
    /// i32s containing the indexes of the cleanup destinations.
    Address NormalCleanupDest = Address::invalid();
  
    unsigned NextCleanupDestIndex = 1;
  
    /// EHResumeBlock - Unified block containing a call to llvm.eh.resume.
    llvm::BasicBlock *EHResumeBlock = nullptr;
  
    /// The exception slot.  All landing pads write the current exception pointer
    /// into this alloca.
    llvm::Value *ExceptionSlot = nullptr;
  
    /// The selector slot.  Under the MandatoryCleanup model, all landing pads
    /// write the current selector value into this alloca.
    llvm::AllocaInst *EHSelectorSlot = nullptr;
  
    /// A stack of exception code slots. Entering an __except block pushes a slot
    /// on the stack and leaving pops one. The __exception_code() intrinsic loads
    /// a value from the top of the stack.
    SmallVector<Address, 1> SEHCodeSlotStack;
  
    /// Value returned by __exception_info intrinsic.
    llvm::Value *SEHInfo = nullptr;
  
    /// Emits a landing pad for the current EH stack.
    llvm::BasicBlock *EmitLandingPad();
  
    llvm::BasicBlock *getInvokeDestImpl();
  
    /// Parent loop-based directive for scan directive.
    const OMPExecutableDirective *OMPParentLoopDirectiveForScan = nullptr;
    llvm::BasicBlock *OMPBeforeScanBlock = nullptr;
    llvm::BasicBlock *OMPAfterScanBlock = nullptr;
    llvm::BasicBlock *OMPScanExitBlock = nullptr;
    llvm::BasicBlock *OMPScanDispatch = nullptr;
    bool OMPFirstScanLoop = false;
  
    /// Manages parent directive for scan directives.
    class ParentLoopDirectiveForScanRegion {
      CodeGenFunction &CGF;
      const OMPExecutableDirective *ParentLoopDirectiveForScan;
  
    public:
      ParentLoopDirectiveForScanRegion(
          CodeGenFunction &CGF,
          const OMPExecutableDirective &ParentLoopDirectiveForScan)
          : CGF(CGF),
            ParentLoopDirectiveForScan(CGF.OMPParentLoopDirectiveForScan) {
        CGF.OMPParentLoopDirectiveForScan = &ParentLoopDirectiveForScan;
      }
      ~ParentLoopDirectiveForScanRegion() {
        CGF.OMPParentLoopDirectiveForScan = ParentLoopDirectiveForScan;
      }
    };
  
    template <class T>
    typename DominatingValue<T>::saved_type saveValueInCond(T value) {
      return DominatingValue<T>::save(*this, value);
    }
  
    class CGFPOptionsRAII {
    public:
      CGFPOptionsRAII(CodeGenFunction &CGF, FPOptions FPFeatures);
      CGFPOptionsRAII(CodeGenFunction &CGF, const Expr *E);
      ~CGFPOptionsRAII();
  
    private:
      void ConstructorHelper(FPOptions FPFeatures);
      CodeGenFunction &CGF;
      FPOptions OldFPFeatures;
      llvm::fp::ExceptionBehavior OldExcept;
      llvm::RoundingMode OldRounding;
      Optional<CGBuilderTy::FastMathFlagGuard> FMFGuard;
    };
    FPOptions CurFPFeatures;
  
  public:
    /// ObjCEHValueStack - Stack of Objective-C exception values, used for
    /// rethrows.
    SmallVector<llvm::Value*, 8> ObjCEHValueStack;
  
    /// A class controlling the emission of a finally block.
    class FinallyInfo {
      /// Where the catchall's edge through the cleanup should go.
      JumpDest RethrowDest;
  
      /// A function to call to enter the catch.
      llvm::FunctionCallee BeginCatchFn;
  
      /// An i1 variable indicating whether or not the @finally is
      /// running for an exception.
      llvm::AllocaInst *ForEHVar;
  
      /// An i8* variable into which the exception pointer to rethrow
      /// has been saved.
      llvm::AllocaInst *SavedExnVar;
  
    public:
      void enter(CodeGenFunction &CGF, const Stmt *Finally,
                 llvm::FunctionCallee beginCatchFn,
                 llvm::FunctionCallee endCatchFn, llvm::FunctionCallee rethrowFn);
      void exit(CodeGenFunction &CGF);
    };
  
    /// Returns true inside SEH __try blocks.
    bool isSEHTryScope() const { return !SEHTryEpilogueStack.empty(); }
  
    /// Returns true while emitting a cleanuppad.
    bool isCleanupPadScope() const {
      return CurrentFuncletPad && isa<llvm::CleanupPadInst>(CurrentFuncletPad);
    }
  
    /// pushFullExprCleanup - Push a cleanup to be run at the end of the
    /// current full-expression.  Safe against the possibility that
    /// we're currently inside a conditionally-evaluated expression.
    template <class T, class... As>
    void pushFullExprCleanup(CleanupKind kind, As... A) {
      // If we're not in a conditional branch, or if none of the
      // arguments requires saving, then use the unconditional cleanup.
      if (!isInConditionalBranch())
        return EHStack.pushCleanup<T>(kind, A...);
  
      // Stash values in a tuple so we can guarantee the order of saves.
      typedef std::tuple<typename DominatingValue<As>::saved_type...> SavedTuple;
      SavedTuple Saved{saveValueInCond(A)...};
  
      typedef EHScopeStack::ConditionalCleanup<T, As...> CleanupType;
      EHStack.pushCleanupTuple<CleanupType>(kind, Saved);
      initFullExprCleanup();
    }
  
    /// Queue a cleanup to be pushed after finishing the current full-expression,
    /// potentially with an active flag.
    template <class T, class... As>
    void pushCleanupAfterFullExpr(CleanupKind Kind, As... A) {
      if (!isInConditionalBranch())
        return pushCleanupAfterFullExprWithActiveFlag<T>(Kind, Address::invalid(),
                                                         A...);
  
      Address ActiveFlag = createCleanupActiveFlag();
      assert(!DominatingValue<Address>::needsSaving(ActiveFlag) &&
             "cleanup active flag should never need saving");
  
      typedef std::tuple<typename DominatingValue<As>::saved_type...> SavedTuple;
      SavedTuple Saved{saveValueInCond(A)...};
  
      typedef EHScopeStack::ConditionalCleanup<T, As...> CleanupType;
      pushCleanupAfterFullExprWithActiveFlag<CleanupType>(Kind, ActiveFlag, Saved);
    }
  
    template <class T, class... As>
    void pushCleanupAfterFullExprWithActiveFlag(CleanupKind Kind,
                                                Address ActiveFlag, As... A) {
      LifetimeExtendedCleanupHeader Header = {sizeof(T), Kind,
                                              ActiveFlag.isValid()};
  
      size_t OldSize = LifetimeExtendedCleanupStack.size();
      LifetimeExtendedCleanupStack.resize(
          LifetimeExtendedCleanupStack.size() + sizeof(Header) + Header.Size +
          (Header.IsConditional ? sizeof(ActiveFlag) : 0));
  
      static_assert(sizeof(Header) % alignof(T) == 0,
                    "Cleanup will be allocated on misaligned address");
      char *Buffer = &LifetimeExtendedCleanupStack[OldSize];
      new (Buffer) LifetimeExtendedCleanupHeader(Header);
      new (Buffer + sizeof(Header)) T(A...);
      if (Header.IsConditional)
        new (Buffer + sizeof(Header) + sizeof(T)) Address(ActiveFlag);
    }
  
    /// Set up the last cleanup that was pushed as a conditional
    /// full-expression cleanup.
    void initFullExprCleanup() {
      initFullExprCleanupWithFlag(createCleanupActiveFlag());
    }
  
    void initFullExprCleanupWithFlag(Address ActiveFlag);
    Address createCleanupActiveFlag();
  
    /// PushDestructorCleanup - Push a cleanup to call the
    /// complete-object destructor of an object of the given type at the
    /// given address.  Does nothing if T is not a C++ class type with a
    /// non-trivial destructor.
    void PushDestructorCleanup(QualType T, Address Addr);
  
    /// PushDestructorCleanup - Push a cleanup to call the
    /// complete-object variant of the given destructor on the object at
    /// the given address.
    void PushDestructorCleanup(const CXXDestructorDecl *Dtor, QualType T,
                               Address Addr);
  
    /// PopCleanupBlock - Will pop the cleanup entry on the stack and
    /// process all branch fixups.
    void PopCleanupBlock(bool FallThroughIsBranchThrough = false);
  
    /// DeactivateCleanupBlock - Deactivates the given cleanup block.
    /// The block cannot be reactivated.  Pops it if it's the top of the
    /// stack.
    ///
    /// \param DominatingIP - An instruction which is known to
    ///   dominate the current IP (if set) and which lies along
    ///   all paths of execution between the current IP and the
    ///   the point at which the cleanup comes into scope.
    void DeactivateCleanupBlock(EHScopeStack::stable_iterator Cleanup,
                                llvm::Instruction *DominatingIP);
  
    /// ActivateCleanupBlock - Activates an initially-inactive cleanup.
    /// Cannot be used to resurrect a deactivated cleanup.
    ///
    /// \param DominatingIP - An instruction which is known to
    ///   dominate the current IP (if set) and which lies along
    ///   all paths of execution between the current IP and the
    ///   the point at which the cleanup comes into scope.
    void ActivateCleanupBlock(EHScopeStack::stable_iterator Cleanup,
                              llvm::Instruction *DominatingIP);
  
    /// Enters a new scope for capturing cleanups, all of which
    /// will be executed once the scope is exited.
    class RunCleanupsScope {
      EHScopeStack::stable_iterator CleanupStackDepth, OldCleanupScopeDepth;
      size_t LifetimeExtendedCleanupStackSize;
      bool OldDidCallStackSave;
    protected:
      bool PerformCleanup;
    private:
  
      RunCleanupsScope(const RunCleanupsScope &) = delete;
      void operator=(const RunCleanupsScope &) = delete;
  
    protected:
      CodeGenFunction& CGF;
  
    public:
      /// Enter a new cleanup scope.
      explicit RunCleanupsScope(CodeGenFunction &CGF)
        : PerformCleanup(true), CGF(CGF)
      {
        CleanupStackDepth = CGF.EHStack.stable_begin();
        LifetimeExtendedCleanupStackSize =
            CGF.LifetimeExtendedCleanupStack.size();
        OldDidCallStackSave = CGF.DidCallStackSave;
        CGF.DidCallStackSave = false;
        OldCleanupScopeDepth = CGF.CurrentCleanupScopeDepth;
        CGF.CurrentCleanupScopeDepth = CleanupStackDepth;
      }
  
      /// Exit this cleanup scope, emitting any accumulated cleanups.
      ~RunCleanupsScope() {
        if (PerformCleanup)
          ForceCleanup();
      }
  
      /// Determine whether this scope requires any cleanups.
      bool requiresCleanups() const {
        return CGF.EHStack.stable_begin() != CleanupStackDepth;
      }
  
      /// Force the emission of cleanups now, instead of waiting
      /// until this object is destroyed.
      /// \param ValuesToReload - A list of values that need to be available at
      /// the insertion point after cleanup emission. If cleanup emission created
      /// a shared cleanup block, these value pointers will be rewritten.
      /// Otherwise, they not will be modified.
      void ForceCleanup(std::initializer_list<llvm::Value**> ValuesToReload = {}) {
        assert(PerformCleanup && "Already forced cleanup");
        CGF.DidCallStackSave = OldDidCallStackSave;
        CGF.PopCleanupBlocks(CleanupStackDepth, LifetimeExtendedCleanupStackSize,
                             ValuesToReload);
        PerformCleanup = false;
        CGF.CurrentCleanupScopeDepth = OldCleanupScopeDepth;
      }
    };
  
    // Cleanup stack depth of the RunCleanupsScope that was pushed most recently.
    EHScopeStack::stable_iterator CurrentCleanupScopeDepth =
        EHScopeStack::stable_end();
  
    class LexicalScope : public RunCleanupsScope {
      SourceRange Range;
      SmallVector<const LabelDecl*, 4> Labels;
      LexicalScope *ParentScope;
  
      LexicalScope(const LexicalScope &) = delete;
      void operator=(const LexicalScope &) = delete;
  
    public:
      /// Enter a new cleanup scope.
      explicit LexicalScope(CodeGenFunction &CGF, SourceRange Range)
        : RunCleanupsScope(CGF), Range(Range), ParentScope(CGF.CurLexicalScope) {
        CGF.CurLexicalScope = this;
        if (CGDebugInfo *DI = CGF.getDebugInfo())
          DI->EmitLexicalBlockStart(CGF.Builder, Range.getBegin());
      }
  
      void addLabel(const LabelDecl *label) {
        assert(PerformCleanup && "adding label to dead scope?");
        Labels.push_back(label);
      }
  
      /// Exit this cleanup scope, emitting any accumulated
      /// cleanups.
      ~LexicalScope() {
        if (CGDebugInfo *DI = CGF.getDebugInfo())
          DI->EmitLexicalBlockEnd(CGF.Builder, Range.getEnd());
  
        // If we should perform a cleanup, force them now.  Note that
        // this ends the cleanup scope before rescoping any labels.
        if (PerformCleanup) {
          ApplyDebugLocation DL(CGF, Range.getEnd());
          ForceCleanup();
        }
      }
  
      /// Force the emission of cleanups now, instead of waiting
      /// until this object is destroyed.
      void ForceCleanup() {
        CGF.CurLexicalScope = ParentScope;
        RunCleanupsScope::ForceCleanup();
  
        if (!Labels.empty())
          rescopeLabels();
      }
  
      bool hasLabels() const {
        return !Labels.empty();
      }
  
      void rescopeLabels();
    };
  
    typedef llvm::DenseMap<const Decl *, Address> DeclMapTy;
  
    /// The class used to assign some variables some temporarily addresses.
    class OMPMapVars {
      DeclMapTy SavedLocals;
      DeclMapTy SavedTempAddresses;
      OMPMapVars(const OMPMapVars &) = delete;
      void operator=(const OMPMapVars &) = delete;
  
    public:
      explicit OMPMapVars() = default;
      ~OMPMapVars() {
        assert(SavedLocals.empty() && "Did not restored original addresses.");
      };
  
      /// Sets the address of the variable \p LocalVD to be \p TempAddr in
      /// function \p CGF.
      /// \return true if at least one variable was set already, false otherwise.
      bool setVarAddr(CodeGenFunction &CGF, const VarDecl *LocalVD,
                      Address TempAddr) {
        LocalVD = LocalVD->getCanonicalDecl();
        // Only save it once.
        if (SavedLocals.count(LocalVD)) return false;
  
        // Copy the existing local entry to SavedLocals.
        auto it = CGF.LocalDeclMap.find(LocalVD);
        if (it != CGF.LocalDeclMap.end())
          SavedLocals.try_emplace(LocalVD, it->second);
        else
          SavedLocals.try_emplace(LocalVD, Address::invalid());
  
        // Generate the private entry.
        QualType VarTy = LocalVD->getType();
        if (VarTy->isReferenceType()) {
          Address Temp = CGF.CreateMemTemp(VarTy);
          CGF.Builder.CreateStore(TempAddr.getPointer(), Temp);
          TempAddr = Temp;
        }
        SavedTempAddresses.try_emplace(LocalVD, TempAddr);
  
        return true;
      }
  
      /// Applies new addresses to the list of the variables.
      /// \return true if at least one variable is using new address, false
      /// otherwise.
      bool apply(CodeGenFunction &CGF) {
        copyInto(SavedTempAddresses, CGF.LocalDeclMap);
        SavedTempAddresses.clear();
        return !SavedLocals.empty();
      }
  
      /// Restores original addresses of the variables.
      void restore(CodeGenFunction &CGF) {
        if (!SavedLocals.empty()) {
          copyInto(SavedLocals, CGF.LocalDeclMap);
          SavedLocals.clear();
        }
      }
  
    private:
      /// Copy all the entries in the source map over the corresponding
      /// entries in the destination, which must exist.
      static void copyInto(const DeclMapTy &Src, DeclMapTy &Dest) {
        for (auto &Pair : Src) {
          if (!Pair.second.isValid()) {
            Dest.erase(Pair.first);
            continue;
          }
  
          auto I = Dest.find(Pair.first);
          if (I != Dest.end())
            I->second = Pair.second;
          else
            Dest.insert(Pair);
        }
      }
    };
  
    /// The scope used to remap some variables as private in the OpenMP loop body
    /// (or other captured region emitted without outlining), and to restore old
    /// vars back on exit.
    class OMPPrivateScope : public RunCleanupsScope {
      OMPMapVars MappedVars;
      OMPPrivateScope(const OMPPrivateScope &) = delete;
      void operator=(const OMPPrivateScope &) = delete;
  
    public:
      /// Enter a new OpenMP private scope.
      explicit OMPPrivateScope(CodeGenFunction &CGF) : RunCleanupsScope(CGF) {}
  
      /// Registers \p LocalVD variable as a private and apply \p PrivateGen
      /// function for it to generate corresponding private variable. \p
      /// PrivateGen returns an address of the generated private variable.
      /// \return true if the variable is registered as private, false if it has
      /// been privatized already.
      bool addPrivate(const VarDecl *LocalVD,
                      const llvm::function_ref<Address()> PrivateGen) {
        assert(PerformCleanup && "adding private to dead scope");
        return MappedVars.setVarAddr(CGF, LocalVD, PrivateGen());
      }
  
      /// Privatizes local variables previously registered as private.
      /// Registration is separate from the actual privatization to allow
      /// initializers use values of the original variables, not the private one.
      /// This is important, for example, if the private variable is a class
      /// variable initialized by a constructor that references other private
      /// variables. But at initialization original variables must be used, not
      /// private copies.
      /// \return true if at least one variable was privatized, false otherwise.
      bool Privatize() { return MappedVars.apply(CGF); }
  
      void ForceCleanup() {
        RunCleanupsScope::ForceCleanup();
        MappedVars.restore(CGF);
      }
  
      /// Exit scope - all the mapped variables are restored.
      ~OMPPrivateScope() {
        if (PerformCleanup)
          ForceCleanup();
      }
  
      /// Checks if the global variable is captured in current function.
      bool isGlobalVarCaptured(const VarDecl *VD) const {
        VD = VD->getCanonicalDecl();
        return !VD->isLocalVarDeclOrParm() && CGF.LocalDeclMap.count(VD) > 0;
      }
    };
  
    /// Save/restore original map of previously emitted local vars in case when we
    /// need to duplicate emission of the same code several times in the same
    /// function for OpenMP code.
    class OMPLocalDeclMapRAII {
      CodeGenFunction &CGF;
      DeclMapTy SavedMap;
  
    public:
      OMPLocalDeclMapRAII(CodeGenFunction &CGF)
          : CGF(CGF), SavedMap(CGF.LocalDeclMap) {}
      ~OMPLocalDeclMapRAII() { SavedMap.swap(CGF.LocalDeclMap); }
    };
  
    /// Takes the old cleanup stack size and emits the cleanup blocks
    /// that have been added.
    void
    PopCleanupBlocks(EHScopeStack::stable_iterator OldCleanupStackSize,
                     std::initializer_list<llvm::Value **> ValuesToReload = {});
  
    /// Takes the old cleanup stack size and emits the cleanup blocks
    /// that have been added, then adds all lifetime-extended cleanups from
    /// the given position to the stack.
    void
    PopCleanupBlocks(EHScopeStack::stable_iterator OldCleanupStackSize,
                     size_t OldLifetimeExtendedStackSize,
                     std::initializer_list<llvm::Value **> ValuesToReload = {});
  
    void ResolveBranchFixups(llvm::BasicBlock *Target);
  
    /// The given basic block lies in the current EH scope, but may be a
    /// target of a potentially scope-crossing jump; get a stable handle
    /// to which we can perform this jump later.
    JumpDest getJumpDestInCurrentScope(llvm::BasicBlock *Target) {
      return JumpDest(Target,
                      EHStack.getInnermostNormalCleanup(),
                      NextCleanupDestIndex++);
    }
  
    /// The given basic block lies in the current EH scope, but may be a
    /// target of a potentially scope-crossing jump; get a stable handle
    /// to which we can perform this jump later.
    JumpDest getJumpDestInCurrentScope(StringRef Name = StringRef()) {
      return getJumpDestInCurrentScope(createBasicBlock(Name));
    }
  
    /// EmitBranchThroughCleanup - Emit a branch from the current insert
    /// block through the normal cleanup handling code (if any) and then
    /// on to \arg Dest.
    void EmitBranchThroughCleanup(JumpDest Dest);
  
    /// isObviouslyBranchWithoutCleanups - Return true if a branch to the
    /// specified destination obviously has no cleanups to run.  'false' is always
    /// a conservatively correct answer for this method.
    bool isObviouslyBranchWithoutCleanups(JumpDest Dest) const;
  
    /// popCatchScope - Pops the catch scope at the top of the EHScope
    /// stack, emitting any required code (other than the catch handlers
    /// themselves).
    void popCatchScope();
  
    llvm::BasicBlock *getEHResumeBlock(bool isCleanup);
    llvm::BasicBlock *getEHDispatchBlock(EHScopeStack::stable_iterator scope);
    llvm::BasicBlock *
    getFuncletEHDispatchBlock(EHScopeStack::stable_iterator scope);
  
    /// An object to manage conditionally-evaluated expressions.
    class ConditionalEvaluation {
      llvm::BasicBlock *StartBB;
  
    public:
      ConditionalEvaluation(CodeGenFunction &CGF)
        : StartBB(CGF.Builder.GetInsertBlock()) {}
  
      void begin(CodeGenFunction &CGF) {
        assert(CGF.OutermostConditional != this);
        if (!CGF.OutermostConditional)
          CGF.OutermostConditional = this;
      }
  
      void end(CodeGenFunction &CGF) {
        assert(CGF.OutermostConditional != nullptr);
        if (CGF.OutermostConditional == this)
          CGF.OutermostConditional = nullptr;
      }
  
      /// Returns a block which will be executed prior to each
      /// evaluation of the conditional code.
      llvm::BasicBlock *getStartingBlock() const {
        return StartBB;
      }
    };
  
    /// isInConditionalBranch - Return true if we're currently emitting
    /// one branch or the other of a conditional expression.
    bool isInConditionalBranch() const { return OutermostConditional != nullptr; }
  
    void setBeforeOutermostConditional(llvm::Value *value, Address addr) {
      assert(isInConditionalBranch());
      llvm::BasicBlock *block = OutermostConditional->getStartingBlock();
      auto store = new llvm::StoreInst(value, addr.getPointer(), &block->back());
      store->setAlignment(addr.getAlignment().getAsAlign());
    }
  
    /// An RAII object to record that we're evaluating a statement
    /// expression.
    class StmtExprEvaluation {
      CodeGenFunction &CGF;
  
      /// We have to save the outermost conditional: cleanups in a
      /// statement expression aren't conditional just because the
      /// StmtExpr is.
      ConditionalEvaluation *SavedOutermostConditional;
  
    public:
      StmtExprEvaluation(CodeGenFunction &CGF)
        : CGF(CGF), SavedOutermostConditional(CGF.OutermostConditional) {
        CGF.OutermostConditional = nullptr;
      }
  
      ~StmtExprEvaluation() {
        CGF.OutermostConditional = SavedOutermostConditional;
        CGF.EnsureInsertPoint();
      }
    };
  
    /// An object which temporarily prevents a value from being
    /// destroyed by aggressive peephole optimizations that assume that
    /// all uses of a value have been realized in the IR.
    class PeepholeProtection {
      llvm::Instruction *Inst;
      friend class CodeGenFunction;
  
    public:
      PeepholeProtection() : Inst(nullptr) {}
    };
  
    /// A non-RAII class containing all the information about a bound
    /// opaque value.  OpaqueValueMapping, below, is a RAII wrapper for
    /// this which makes individual mappings very simple; using this
    /// class directly is useful when you have a variable number of
    /// opaque values or don't want the RAII functionality for some
    /// reason.
    class OpaqueValueMappingData {
      const OpaqueValueExpr *OpaqueValue;
      bool BoundLValue;
      CodeGenFunction::PeepholeProtection Protection;
  
      OpaqueValueMappingData(const OpaqueValueExpr *ov,
                             bool boundLValue)
        : OpaqueValue(ov), BoundLValue(boundLValue) {}
    public:
      OpaqueValueMappingData() : OpaqueValue(nullptr) {}
  
      static bool shouldBindAsLValue(const Expr *expr) {
        // gl-values should be bound as l-values for obvious reasons.
        // Records should be bound as l-values because IR generation
        // always keeps them in memory.  Expressions of function type
        // act exactly like l-values but are formally required to be
        // r-values in C.
        return expr->isGLValue() ||
               expr->getType()->isFunctionType() ||
               hasAggregateEvaluationKind(expr->getType());
      }
  
      static OpaqueValueMappingData bind(CodeGenFunction &CGF,
                                         const OpaqueValueExpr *ov,
                                         const Expr *e) {
        if (shouldBindAsLValue(ov))
          return bind(CGF, ov, CGF.EmitLValue(e));
        return bind(CGF, ov, CGF.EmitAnyExpr(e));
      }
  
      static OpaqueValueMappingData bind(CodeGenFunction &CGF,
                                         const OpaqueValueExpr *ov,
                                         const LValue &lv) {
        assert(shouldBindAsLValue(ov));
        CGF.OpaqueLValues.insert(std::make_pair(ov, lv));
        return OpaqueValueMappingData(ov, true);
      }
  
      static OpaqueValueMappingData bind(CodeGenFunction &CGF,
                                         const OpaqueValueExpr *ov,
                                         const RValue &rv) {
        assert(!shouldBindAsLValue(ov));
        CGF.OpaqueRValues.insert(std::make_pair(ov, rv));
  
        OpaqueValueMappingData data(ov, false);
  
        // Work around an extremely aggressive peephole optimization in
        // EmitScalarConversion which assumes that all other uses of a
        // value are extant.
        data.Protection = CGF.protectFromPeepholes(rv);
  
        return data;
      }
  
      bool isValid() const { return OpaqueValue != nullptr; }
      void clear() { OpaqueValue = nullptr; }
  
      void unbind(CodeGenFunction &CGF) {
        assert(OpaqueValue && "no data to unbind!");
  
        if (BoundLValue) {
          CGF.OpaqueLValues.erase(OpaqueValue);
        } else {
          CGF.OpaqueRValues.erase(OpaqueValue);
          CGF.unprotectFromPeepholes(Protection);
        }
      }
    };
  
    /// An RAII object to set (and then clear) a mapping for an OpaqueValueExpr.
    class OpaqueValueMapping {
      CodeGenFunction &CGF;
      OpaqueValueMappingData Data;
  
    public:
      static bool shouldBindAsLValue(const Expr *expr) {
        return OpaqueValueMappingData::shouldBindAsLValue(expr);
      }
  
      /// Build the opaque value mapping for the given conditional
      /// operator if it's the GNU ?: extension.  This is a common
      /// enough pattern that the convenience operator is really
      /// helpful.
      ///
      OpaqueValueMapping(CodeGenFunction &CGF,
                         const AbstractConditionalOperator *op) : CGF(CGF) {
        if (isa<ConditionalOperator>(op))
          // Leave Data empty.
          return;
  
        const BinaryConditionalOperator *e = cast<BinaryConditionalOperator>(op);
        Data = OpaqueValueMappingData::bind(CGF, e->getOpaqueValue(),
                                            e->getCommon());
      }
  
      /// Build the opaque value mapping for an OpaqueValueExpr whose source
      /// expression is set to the expression the OVE represents.
      OpaqueValueMapping(CodeGenFunction &CGF, const OpaqueValueExpr *OV)
          : CGF(CGF) {
        if (OV) {
          assert(OV->getSourceExpr() && "wrong form of OpaqueValueMapping used "
                                        "for OVE with no source expression");
          Data = OpaqueValueMappingData::bind(CGF, OV, OV->getSourceExpr());
        }
      }
  
      OpaqueValueMapping(CodeGenFunction &CGF,
                         const OpaqueValueExpr *opaqueValue,
                         LValue lvalue)
        : CGF(CGF), Data(OpaqueValueMappingData::bind(CGF, opaqueValue, lvalue)) {
      }
  
      OpaqueValueMapping(CodeGenFunction &CGF,
                         const OpaqueValueExpr *opaqueValue,
                         RValue rvalue)
        : CGF(CGF), Data(OpaqueValueMappingData::bind(CGF, opaqueValue, rvalue)) {
      }
  
      void pop() {
        Data.unbind(CGF);
        Data.clear();
      }
  
      ~OpaqueValueMapping() {
        if (Data.isValid()) Data.unbind(CGF);
      }
    };
  
  private:
    CGDebugInfo *DebugInfo;
    /// Used to create unique names for artificial VLA size debug info variables.
    unsigned VLAExprCounter = 0;
    bool DisableDebugInfo = false;
  
    /// DidCallStackSave - Whether llvm.stacksave has been called. Used to avoid
    /// calling llvm.stacksave for multiple VLAs in the same scope.
    bool DidCallStackSave = false;
  
    /// IndirectBranch - The first time an indirect goto is seen we create a block
    /// with an indirect branch.  Every time we see the address of a label taken,
    /// we add the label to the indirect goto.  Every subsequent indirect goto is
    /// codegen'd as a jump to the IndirectBranch's basic block.
    llvm::IndirectBrInst *IndirectBranch = nullptr;
  
    /// LocalDeclMap - This keeps track of the LLVM allocas or globals for local C
    /// decls.
    DeclMapTy LocalDeclMap;
  
    // Keep track of the cleanups for callee-destructed parameters pushed to the
    // cleanup stack so that they can be deactivated later.
    llvm::DenseMap<const ParmVarDecl *, EHScopeStack::stable_iterator>
        CalleeDestructedParamCleanups;
  
    /// SizeArguments - If a ParmVarDecl had the pass_object_size attribute, this
    /// will contain a mapping from said ParmVarDecl to its implicit "object_size"
    /// parameter.
    llvm::SmallDenseMap<const ParmVarDecl *, const ImplicitParamDecl *, 2>
        SizeArguments;
  
    /// Track escaped local variables with auto storage. Used during SEH
    /// outlining to produce a call to llvm.localescape.
    llvm::DenseMap<llvm::AllocaInst *, int> EscapedLocals;
  
    /// LabelMap - This keeps track of the LLVM basic block for each C label.
    llvm::DenseMap<const LabelDecl*, JumpDest> LabelMap;
  
    // BreakContinueStack - This keeps track of where break and continue
    // statements should jump to.
    struct BreakContinue {
      BreakContinue(JumpDest Break, JumpDest Continue)
        : BreakBlock(Break), ContinueBlock(Continue) {}
  
      JumpDest BreakBlock;
      JumpDest ContinueBlock;
    };
    SmallVector<BreakContinue, 8> BreakContinueStack;
  
    /// Handles cancellation exit points in OpenMP-related constructs.
    class OpenMPCancelExitStack {
      /// Tracks cancellation exit point and join point for cancel-related exit
      /// and normal exit.
      struct CancelExit {
        CancelExit() = default;
        CancelExit(OpenMPDirectiveKind Kind, JumpDest ExitBlock,
                   JumpDest ContBlock)
            : Kind(Kind), ExitBlock(ExitBlock), ContBlock(ContBlock) {}
        OpenMPDirectiveKind Kind = llvm::omp::OMPD_unknown;
        /// true if the exit block has been emitted already by the special
        /// emitExit() call, false if the default codegen is used.
        bool HasBeenEmitted = false;
        JumpDest ExitBlock;
        JumpDest ContBlock;
      };
  
      SmallVector<CancelExit, 8> Stack;
  
    public:
      OpenMPCancelExitStack() : Stack(1) {}
      ~OpenMPCancelExitStack() = default;
      /// Fetches the exit block for the current OpenMP construct.
      JumpDest getExitBlock() const { return Stack.back().ExitBlock; }
      /// Emits exit block with special codegen procedure specific for the related
      /// OpenMP construct + emits code for normal construct cleanup.
      void emitExit(CodeGenFunction &CGF, OpenMPDirectiveKind Kind,
                    const llvm::function_ref<void(CodeGenFunction &)> CodeGen) {
        if (Stack.back().Kind == Kind && getExitBlock().isValid()) {
          assert(CGF.getOMPCancelDestination(Kind).isValid());
          assert(CGF.HaveInsertPoint());
          assert(!Stack.back().HasBeenEmitted);
          auto IP = CGF.Builder.saveAndClearIP();
          CGF.EmitBlock(Stack.back().ExitBlock.getBlock());
          CodeGen(CGF);
          CGF.EmitBranch(Stack.back().ContBlock.getBlock());
          CGF.Builder.restoreIP(IP);
          Stack.back().HasBeenEmitted = true;
        }
        CodeGen(CGF);
      }
      /// Enter the cancel supporting \a Kind construct.
      /// \param Kind OpenMP directive that supports cancel constructs.
      /// \param HasCancel true, if the construct has inner cancel directive,
      /// false otherwise.
      void enter(CodeGenFunction &CGF, OpenMPDirectiveKind Kind, bool HasCancel) {
        Stack.push_back({Kind,
                         HasCancel ? CGF.getJumpDestInCurrentScope("cancel.exit")
                                   : JumpDest(),
                         HasCancel ? CGF.getJumpDestInCurrentScope("cancel.cont")
                                   : JumpDest()});
      }
      /// Emits default exit point for the cancel construct (if the special one
      /// has not be used) + join point for cancel/normal exits.
      void exit(CodeGenFunction &CGF) {
        if (getExitBlock().isValid()) {
          assert(CGF.getOMPCancelDestination(Stack.back().Kind).isValid());
          bool HaveIP = CGF.HaveInsertPoint();
          if (!Stack.back().HasBeenEmitted) {
            if (HaveIP)
              CGF.EmitBranchThroughCleanup(Stack.back().ContBlock);
            CGF.EmitBlock(Stack.back().ExitBlock.getBlock());
            CGF.EmitBranchThroughCleanup(Stack.back().ContBlock);
          }
          CGF.EmitBlock(Stack.back().ContBlock.getBlock());
          if (!HaveIP) {
            CGF.Builder.CreateUnreachable();
            CGF.Builder.ClearInsertionPoint();
          }
        }
        Stack.pop_back();
      }
    };
    OpenMPCancelExitStack OMPCancelStack;
  
    /// Lower the Likelihood knowledge about the \p Cond via llvm.expect intrin.
    llvm::Value *emitCondLikelihoodViaExpectIntrinsic(llvm::Value *Cond,
                                                      Stmt::Likelihood LH);
  
    CodeGenPGO PGO;
  
    /// Calculate branch weights appropriate for PGO data
    llvm::MDNode *createProfileWeights(uint64_t TrueCount,
                                       uint64_t FalseCount) const;
    llvm::MDNode *createProfileWeights(ArrayRef<uint64_t> Weights) const;
    llvm::MDNode *createProfileWeightsForLoop(const Stmt *Cond,
                                              uint64_t LoopCount) const;
  
  public:
    /// Increment the profiler's counter for the given statement by \p StepV.
    /// If \p StepV is null, the default increment is 1.
    void incrementProfileCounter(const Stmt *S, llvm::Value *StepV = nullptr) {
      if (CGM.getCodeGenOpts().hasProfileClangInstr() &&
          !CurFn->hasFnAttribute(llvm::Attribute::NoProfile))
        PGO.emitCounterIncrement(Builder, S, StepV);
      PGO.setCurrentStmt(S);
    }
  
    /// Get the profiler's count for the given statement.
    uint64_t getProfileCount(const Stmt *S) {
      Optional<uint64_t> Count = PGO.getStmtCount(S);
      if (!Count.hasValue())
        return 0;
      return *Count;
    }
  
    /// Set the profiler's current count.
    void setCurrentProfileCount(uint64_t Count) {
      PGO.setCurrentRegionCount(Count);
    }
  
    /// Get the profiler's current count. This is generally the count for the most
    /// recently incremented counter.
    uint64_t getCurrentProfileCount() {
      return PGO.getCurrentRegionCount();
    }
  
  private:
  
    /// SwitchInsn - This is nearest current switch instruction. It is null if
    /// current context is not in a switch.
    llvm::SwitchInst *SwitchInsn = nullptr;
    /// The branch weights of SwitchInsn when doing instrumentation based PGO.
    SmallVector<uint64_t, 16> *SwitchWeights = nullptr;
  
    /// The likelihood attributes of the SwitchCase.
    SmallVector<Stmt::Likelihood, 16> *SwitchLikelihood = nullptr;
  
    /// CaseRangeBlock - This block holds if condition check for last case
    /// statement range in current switch instruction.
    llvm::BasicBlock *CaseRangeBlock = nullptr;
  
    /// OpaqueLValues - Keeps track of the current set of opaque value
    /// expressions.
    llvm::DenseMap<const OpaqueValueExpr *, LValue> OpaqueLValues;
    llvm::DenseMap<const OpaqueValueExpr *, RValue> OpaqueRValues;
  
    // VLASizeMap - This keeps track of the associated size for each VLA type.
    // We track this by the size expression rather than the type itself because
    // in certain situations, like a const qualifier applied to an VLA typedef,
    // multiple VLA types can share the same size expression.
    // FIXME: Maybe this could be a stack of maps that is pushed/popped as we
    // enter/leave scopes.
    llvm::DenseMap<const Expr*, llvm::Value*> VLASizeMap;
  
    /// A block containing a single 'unreachable' instruction.  Created
    /// lazily by getUnreachableBlock().
    llvm::BasicBlock *UnreachableBlock = nullptr;
  
    /// Counts of the number return expressions in the function.
    unsigned NumReturnExprs = 0;
  
    /// Count the number of simple (constant) return expressions in the function.
    unsigned NumSimpleReturnExprs = 0;
  
    /// The last regular (non-return) debug location (breakpoint) in the function.
    SourceLocation LastStopPoint;
  
  public:
    /// Source location information about the default argument or member
    /// initializer expression we're evaluating, if any.
    CurrentSourceLocExprScope CurSourceLocExprScope;
    using SourceLocExprScopeGuard =
        CurrentSourceLocExprScope::SourceLocExprScopeGuard;
  
    /// A scope within which we are constructing the fields of an object which
    /// might use a CXXDefaultInitExpr. This stashes away a 'this' value to use
    /// if we need to evaluate a CXXDefaultInitExpr within the evaluation.
    class FieldConstructionScope {
    public:
      FieldConstructionScope(CodeGenFunction &CGF, Address This)
          : CGF(CGF), OldCXXDefaultInitExprThis(CGF.CXXDefaultInitExprThis) {
        CGF.CXXDefaultInitExprThis = This;
      }
      ~FieldConstructionScope() {
        CGF.CXXDefaultInitExprThis = OldCXXDefaultInitExprThis;
      }
  
    private:
      CodeGenFunction &CGF;
      Address OldCXXDefaultInitExprThis;
    };
  
    /// The scope of a CXXDefaultInitExpr. Within this scope, the value of 'this'
    /// is overridden to be the object under construction.
    class CXXDefaultInitExprScope  {
    public:
      CXXDefaultInitExprScope(CodeGenFunction &CGF, const CXXDefaultInitExpr *E)
          : CGF(CGF), OldCXXThisValue(CGF.CXXThisValue),
            OldCXXThisAlignment(CGF.CXXThisAlignment),
            SourceLocScope(E, CGF.CurSourceLocExprScope) {
        CGF.CXXThisValue = CGF.CXXDefaultInitExprThis.getPointer();
        CGF.CXXThisAlignment = CGF.CXXDefaultInitExprThis.getAlignment();
      }
      ~CXXDefaultInitExprScope() {
        CGF.CXXThisValue = OldCXXThisValue;
        CGF.CXXThisAlignment = OldCXXThisAlignment;
      }
  
    public:
      CodeGenFunction &CGF;
      llvm::Value *OldCXXThisValue;
      CharUnits OldCXXThisAlignment;
      SourceLocExprScopeGuard SourceLocScope;
    };
  
    struct CXXDefaultArgExprScope : SourceLocExprScopeGuard {
      CXXDefaultArgExprScope(CodeGenFunction &CGF, const CXXDefaultArgExpr *E)
          : SourceLocExprScopeGuard(E, CGF.CurSourceLocExprScope) {}
    };
  
    /// The scope of an ArrayInitLoopExpr. Within this scope, the value of the
    /// current loop index is overridden.
    class ArrayInitLoopExprScope {
    public:
      ArrayInitLoopExprScope(CodeGenFunction &CGF, llvm::Value *Index)
        : CGF(CGF), OldArrayInitIndex(CGF.ArrayInitIndex) {
        CGF.ArrayInitIndex = Index;
      }
      ~ArrayInitLoopExprScope() {
        CGF.ArrayInitIndex = OldArrayInitIndex;
      }
  
    private:
      CodeGenFunction &CGF;
      llvm::Value *OldArrayInitIndex;
    };
  
    class InlinedInheritingConstructorScope {
    public:
      InlinedInheritingConstructorScope(CodeGenFunction &CGF, GlobalDecl GD)
          : CGF(CGF), OldCurGD(CGF.CurGD), OldCurFuncDecl(CGF.CurFuncDecl),
            OldCurCodeDecl(CGF.CurCodeDecl),
            OldCXXABIThisDecl(CGF.CXXABIThisDecl),
            OldCXXABIThisValue(CGF.CXXABIThisValue),
            OldCXXThisValue(CGF.CXXThisValue),
            OldCXXABIThisAlignment(CGF.CXXABIThisAlignment),
            OldCXXThisAlignment(CGF.CXXThisAlignment),
            OldReturnValue(CGF.ReturnValue), OldFnRetTy(CGF.FnRetTy),
            OldCXXInheritedCtorInitExprArgs(
                std::move(CGF.CXXInheritedCtorInitExprArgs)) {
        CGF.CurGD = GD;
        CGF.CurFuncDecl = CGF.CurCodeDecl =
            cast<CXXConstructorDecl>(GD.getDecl());
        CGF.CXXABIThisDecl = nullptr;
        CGF.CXXABIThisValue = nullptr;
        CGF.CXXThisValue = nullptr;
        CGF.CXXABIThisAlignment = CharUnits();
        CGF.CXXThisAlignment = CharUnits();
        CGF.ReturnValue = Address::invalid();
        CGF.FnRetTy = QualType();
        CGF.CXXInheritedCtorInitExprArgs.clear();
      }
      ~InlinedInheritingConstructorScope() {
        CGF.CurGD = OldCurGD;
        CGF.CurFuncDecl = OldCurFuncDecl;
        CGF.CurCodeDecl = OldCurCodeDecl;
        CGF.CXXABIThisDecl = OldCXXABIThisDecl;
        CGF.CXXABIThisValue = OldCXXABIThisValue;
        CGF.CXXThisValue = OldCXXThisValue;
        CGF.CXXABIThisAlignment = OldCXXABIThisAlignment;
        CGF.CXXThisAlignment = OldCXXThisAlignment;
        CGF.ReturnValue = OldReturnValue;
        CGF.FnRetTy = OldFnRetTy;
        CGF.CXXInheritedCtorInitExprArgs =
            std::move(OldCXXInheritedCtorInitExprArgs);
      }
  
    private:
      CodeGenFunction &CGF;
      GlobalDecl OldCurGD;
      const Decl *OldCurFuncDecl;
      const Decl *OldCurCodeDecl;
      ImplicitParamDecl *OldCXXABIThisDecl;
      llvm::Value *OldCXXABIThisValue;
      llvm::Value *OldCXXThisValue;
      CharUnits OldCXXABIThisAlignment;
      CharUnits OldCXXThisAlignment;
      Address OldReturnValue;
      QualType OldFnRetTy;
      CallArgList OldCXXInheritedCtorInitExprArgs;
    };
  
    // Helper class for the OpenMP IR Builder. Allows reusability of code used for
    // region body, and finalization codegen callbacks. This will class will also
    // contain privatization functions used by the privatization call backs
    //
    // TODO: this is temporary class for things that are being moved out of
    // CGOpenMPRuntime, new versions of current CodeGenFunction methods, or
    // utility function for use with the OMPBuilder. Once that move to use the
    // OMPBuilder is done, everything here will either become part of CodeGenFunc.
    // directly, or a new helper class that will contain functions used by both
    // this and the OMPBuilder
  
    struct OMPBuilderCBHelpers {
  
      OMPBuilderCBHelpers() = delete;
      OMPBuilderCBHelpers(const OMPBuilderCBHelpers &) = delete;
      OMPBuilderCBHelpers &operator=(const OMPBuilderCBHelpers &) = delete;
  
      using InsertPointTy = llvm::OpenMPIRBuilder::InsertPointTy;
  
      /// Cleanup action for allocate support.
      class OMPAllocateCleanupTy final : public EHScopeStack::Cleanup {
  
      private:
        llvm::CallInst *RTLFnCI;
  
      public:
        OMPAllocateCleanupTy(llvm::CallInst *RLFnCI) : RTLFnCI(RLFnCI) {
          RLFnCI->removeFromParent();
        }
  
        void Emit(CodeGenFunction &CGF, Flags /*flags*/) override {
          if (!CGF.HaveInsertPoint())
            return;
          CGF.Builder.Insert(RTLFnCI);
        }
      };
  
      /// Returns address of the threadprivate variable for the current
      /// thread. This Also create any necessary OMP runtime calls.
      ///
      /// \param VD VarDecl for Threadprivate variable.
      /// \param VDAddr Address of the Vardecl
      /// \param Loc  The location where the barrier directive was encountered
      static Address getAddrOfThreadPrivate(CodeGenFunction &CGF,
                                            const VarDecl *VD, Address VDAddr,
                                            SourceLocation Loc);
  
      /// Gets the OpenMP-specific address of the local variable /p VD.
      static Address getAddressOfLocalVariable(CodeGenFunction &CGF,
                                               const VarDecl *VD);
      /// Get the platform-specific name separator.
      /// \param Parts different parts of the final name that needs separation
      /// \param FirstSeparator First separator used between the initial two
      ///        parts of the name.
      /// \param Separator separator used between all of the rest consecutinve
      ///        parts of the name
      static std::string getNameWithSeparators(ArrayRef<StringRef> Parts,
                                               StringRef FirstSeparator = ".",
                                               StringRef Separator = ".");
      /// Emit the Finalization for an OMP region
      /// \param CGF	The Codegen function this belongs to
      /// \param IP	Insertion point for generating the finalization code.
      static void FinalizeOMPRegion(CodeGenFunction &CGF, InsertPointTy IP) {
        CGBuilderTy::InsertPointGuard IPG(CGF.Builder);
        assert(IP.getBlock()->end() != IP.getPoint() &&
               "OpenMP IR Builder should cause terminated block!");
  
        llvm::BasicBlock *IPBB = IP.getBlock();
        llvm::BasicBlock *DestBB = IPBB->getUniqueSuccessor();
        assert(DestBB && "Finalization block should have one successor!");
  
        // erase and replace with cleanup branch.
        IPBB->getTerminator()->eraseFromParent();
        CGF.Builder.SetInsertPoint(IPBB);
        CodeGenFunction::JumpDest Dest = CGF.getJumpDestInCurrentScope(DestBB);
        CGF.EmitBranchThroughCleanup(Dest);
      }
  
      /// Emit the body of an OMP region
      /// \param CGF	The Codegen function this belongs to
      /// \param RegionBodyStmt	The body statement for the OpenMP region being
      /// 			 generated
      /// \param CodeGenIP	Insertion point for generating the body code.
      /// \param FiniBB	The finalization basic block
      static void EmitOMPRegionBody(CodeGenFunction &CGF,
                                    const Stmt *RegionBodyStmt,
                                    InsertPointTy CodeGenIP,
                                    llvm::BasicBlock &FiniBB) {
        llvm::BasicBlock *CodeGenIPBB = CodeGenIP.getBlock();
        if (llvm::Instruction *CodeGenIPBBTI = CodeGenIPBB->getTerminator())
          CodeGenIPBBTI->eraseFromParent();
  
        CGF.Builder.SetInsertPoint(CodeGenIPBB);
  
        CGF.EmitStmt(RegionBodyStmt);
  
        if (CGF.Builder.saveIP().isSet())
          CGF.Builder.CreateBr(&FiniBB);
      }
  
      /// RAII for preserving necessary info during Outlined region body codegen.
      class OutlinedRegionBodyRAII {
  
        llvm::AssertingVH<llvm::Instruction> OldAllocaIP;
        CodeGenFunction::JumpDest OldReturnBlock;
        CGBuilderTy::InsertPoint IP;
        CodeGenFunction &CGF;
  
      public:
        OutlinedRegionBodyRAII(CodeGenFunction &cgf, InsertPointTy &AllocaIP,
                               llvm::BasicBlock &RetBB)
            : CGF(cgf) {
          assert(AllocaIP.isSet() &&
                 "Must specify Insertion point for allocas of outlined function");
          OldAllocaIP = CGF.AllocaInsertPt;
          CGF.AllocaInsertPt = &*AllocaIP.getPoint();
          IP = CGF.Builder.saveIP();
  
          OldReturnBlock = CGF.ReturnBlock;
          CGF.ReturnBlock = CGF.getJumpDestInCurrentScope(&RetBB);
        }
  
        ~OutlinedRegionBodyRAII() {
          CGF.AllocaInsertPt = OldAllocaIP;
          CGF.ReturnBlock = OldReturnBlock;
          CGF.Builder.restoreIP(IP);
        }
      };
  
      /// RAII for preserving necessary info during inlined region body codegen.
      class InlinedRegionBodyRAII {
  
        llvm::AssertingVH<llvm::Instruction> OldAllocaIP;
        CodeGenFunction &CGF;
  
      public:
        InlinedRegionBodyRAII(CodeGenFunction &cgf, InsertPointTy &AllocaIP,
                              llvm::BasicBlock &FiniBB)
            : CGF(cgf) {
          // Alloca insertion block should be in the entry block of the containing
          // function so it expects an empty AllocaIP in which case will reuse the
          // old alloca insertion point, or a new AllocaIP in the same block as
          // the old one
          assert((!AllocaIP.isSet() ||
                  CGF.AllocaInsertPt->getParent() == AllocaIP.getBlock()) &&
                 "Insertion point should be in the entry block of containing "
                 "function!");
          OldAllocaIP = CGF.AllocaInsertPt;
          if (AllocaIP.isSet())
            CGF.AllocaInsertPt = &*AllocaIP.getPoint();
  
          // TODO: Remove the call, after making sure the counter is not used by
          //       the EHStack.
          // Since this is an inlined region, it should not modify the
          // ReturnBlock, and should reuse the one for the enclosing outlined
          // region. So, the JumpDest being return by the function is discarded
          (void)CGF.getJumpDestInCurrentScope(&FiniBB);
        }
  
        ~InlinedRegionBodyRAII() { CGF.AllocaInsertPt = OldAllocaIP; }
      };
    };
  
  private:
    /// CXXThisDecl - When generating code for a C++ member function,
    /// this will hold the implicit 'this' declaration.
    ImplicitParamDecl *CXXABIThisDecl = nullptr;
    llvm::Value *CXXABIThisValue = nullptr;
    llvm::Value *CXXThisValue = nullptr;
    CharUnits CXXABIThisAlignment;
    CharUnits CXXThisAlignment;
  
    /// The value of 'this' to use when evaluating CXXDefaultInitExprs within
    /// this expression.
    Address CXXDefaultInitExprThis = Address::invalid();
  
    /// The current array initialization index when evaluating an
    /// ArrayInitIndexExpr within an ArrayInitLoopExpr.
    llvm::Value *ArrayInitIndex = nullptr;
  
    /// The values of function arguments to use when evaluating
    /// CXXInheritedCtorInitExprs within this context.
    CallArgList CXXInheritedCtorInitExprArgs;
  
    /// CXXStructorImplicitParamDecl - When generating code for a constructor or
    /// destructor, this will hold the implicit argument (e.g. VTT).
    ImplicitParamDecl *CXXStructorImplicitParamDecl = nullptr;
    llvm::Value *CXXStructorImplicitParamValue = nullptr;
  
    /// OutermostConditional - Points to the outermost active
    /// conditional control.  This is used so that we know if a
    /// temporary should be destroyed conditionally.
    ConditionalEvaluation *OutermostConditional = nullptr;
  
    /// The current lexical scope.
    LexicalScope *CurLexicalScope = nullptr;
  
    /// The current source location that should be used for exception
    /// handling code.
    SourceLocation CurEHLocation;
  
    /// BlockByrefInfos - For each __block variable, contains
    /// information about the layout of the variable.
    llvm::DenseMap<const ValueDecl *, BlockByrefInfo> BlockByrefInfos;
  
    /// Used by -fsanitize=nullability-return to determine whether the return
    /// value can be checked.
    llvm::Value *RetValNullabilityPrecondition = nullptr;
  
    /// Check if -fsanitize=nullability-return instrumentation is required for
    /// this function.
    bool requiresReturnValueNullabilityCheck() const {
      return RetValNullabilityPrecondition;
    }
  
    /// Used to store precise source locations for return statements by the
    /// runtime return value checks.
    Address ReturnLocation = Address::invalid();
  
    /// Check if the return value of this function requires sanitization.
    bool requiresReturnValueCheck() const;
  
    llvm::BasicBlock *TerminateLandingPad = nullptr;
    llvm::BasicBlock *TerminateHandler = nullptr;
    llvm::SmallVector<llvm::BasicBlock *, 2> TrapBBs;
  
    /// Terminate funclets keyed by parent funclet pad.
    llvm::MapVector<llvm::Value *, llvm::BasicBlock *> TerminateFunclets;
  
    /// Largest vector width used in ths function. Will be used to create a
    /// function attribute.
    unsigned LargestVectorWidth = 0;
  
    /// True if we need emit the life-time markers. This is initially set in
    /// the constructor, but could be overwritten to true if this is a coroutine.
    bool ShouldEmitLifetimeMarkers;
  
    /// Add OpenCL kernel arg metadata and the kernel attribute metadata to
    /// the function metadata.
    void EmitOpenCLKernelMetadata(const FunctionDecl *FD,
                                  llvm::Function *Fn);
  
  public:
    CodeGenFunction(CodeGenModule &cgm, bool suppressNewContext=false);
    ~CodeGenFunction();
  
    CodeGenTypes &getTypes() const { return CGM.getTypes(); }
    ASTContext &getContext() const { return CGM.getContext(); }
    CGDebugInfo *getDebugInfo() {
      if (DisableDebugInfo)
        return nullptr;
      return DebugInfo;
    }
    void disableDebugInfo() { DisableDebugInfo = true; }
    void enableDebugInfo() { DisableDebugInfo = false; }
  
    bool shouldUseFusedARCCalls() {
      return CGM.getCodeGenOpts().OptimizationLevel == 0;
    }
  
    const LangOptions &getLangOpts() const { return CGM.getLangOpts(); }
  
    /// Returns a pointer to the function's exception object and selector slot,
    /// which is assigned in every landing pad.
    Address getExceptionSlot();
    Address getEHSelectorSlot();
  
    /// Returns the contents of the function's exception object and selector
    /// slots.
    llvm::Value *getExceptionFromSlot();
    llvm::Value *getSelectorFromSlot();
  
    Address getNormalCleanupDestSlot();
  
    llvm::BasicBlock *getUnreachableBlock() {
      if (!UnreachableBlock) {
        UnreachableBlock = createBasicBlock("unreachable");
        new llvm::UnreachableInst(getLLVMContext(), UnreachableBlock);
      }
      return UnreachableBlock;
    }
  
    llvm::BasicBlock *getInvokeDest() {
      if (!EHStack.requiresLandingPad()) return nullptr;
      return getInvokeDestImpl();
    }
  
    bool currentFunctionUsesSEHTry() const { return CurSEHParent != nullptr; }
  
    const TargetInfo &getTarget() const { return Target; }
    llvm::LLVMContext &getLLVMContext() { return CGM.getLLVMContext(); }
    const TargetCodeGenInfo &getTargetHooks() const {
      return CGM.getTargetCodeGenInfo();
    }
  
    //===--------------------------------------------------------------------===//
    //                                  Cleanups
    //===--------------------------------------------------------------------===//
  
    typedef void Destroyer(CodeGenFunction &CGF, Address addr, QualType ty);
  
    void pushIrregularPartialArrayCleanup(llvm::Value *arrayBegin,
                                          Address arrayEndPointer,
                                          QualType elementType,
                                          CharUnits elementAlignment,
                                          Destroyer *destroyer);
    void pushRegularPartialArrayCleanup(llvm::Value *arrayBegin,
                                        llvm::Value *arrayEnd,
                                        QualType elementType,
                                        CharUnits elementAlignment,
                                        Destroyer *destroyer);
  
    void pushDestroy(QualType::DestructionKind dtorKind,
                     Address addr, QualType type);
    void pushEHDestroy(QualType::DestructionKind dtorKind,
                       Address addr, QualType type);
    void pushDestroy(CleanupKind kind, Address addr, QualType type,
                     Destroyer *destroyer, bool useEHCleanupForArray);
    void pushLifetimeExtendedDestroy(CleanupKind kind, Address addr,
                                     QualType type, Destroyer *destroyer,
                                     bool useEHCleanupForArray);
    void pushCallObjectDeleteCleanup(const FunctionDecl *OperatorDelete,
                                     llvm::Value *CompletePtr,
                                     QualType ElementType);
    void pushStackRestore(CleanupKind kind, Address SPMem);
    void emitDestroy(Address addr, QualType type, Destroyer *destroyer,
                     bool useEHCleanupForArray);
    llvm::Function *generateDestroyHelper(Address addr, QualType type,
                                          Destroyer *destroyer,
                                          bool useEHCleanupForArray,
                                          const VarDecl *VD);
    void emitArrayDestroy(llvm::Value *begin, llvm::Value *end,
                          QualType elementType, CharUnits elementAlign,
                          Destroyer *destroyer,
                          bool checkZeroLength, bool useEHCleanup);
  
    Destroyer *getDestroyer(QualType::DestructionKind destructionKind);
  
    /// Determines whether an EH cleanup is required to destroy a type
    /// with the given destruction kind.
    bool needsEHCleanup(QualType::DestructionKind kind) {
      switch (kind) {
      case QualType::DK_none:
        return false;
      case QualType::DK_cxx_destructor:
      case QualType::DK_objc_weak_lifetime:
      case QualType::DK_nontrivial_c_struct:
        return getLangOpts().Exceptions;
      case QualType::DK_objc_strong_lifetime:
        return getLangOpts().Exceptions &&
               CGM.getCodeGenOpts().ObjCAutoRefCountExceptions;
      }
      llvm_unreachable("bad destruction kind");
    }
  
    CleanupKind getCleanupKind(QualType::DestructionKind kind) {
      return (needsEHCleanup(kind) ? NormalAndEHCleanup : NormalCleanup);
    }
  
    //===--------------------------------------------------------------------===//
    //                                  Objective-C
    //===--------------------------------------------------------------------===//
  
    void GenerateObjCMethod(const ObjCMethodDecl *OMD);
  
    void StartObjCMethod(const ObjCMethodDecl *MD, const ObjCContainerDecl *CD);
  
    /// GenerateObjCGetter - Synthesize an Objective-C property getter function.
    void GenerateObjCGetter(ObjCImplementationDecl *IMP,
                            const ObjCPropertyImplDecl *PID);
    void generateObjCGetterBody(const ObjCImplementationDecl *classImpl,
                                const ObjCPropertyImplDecl *propImpl,
                                const ObjCMethodDecl *GetterMothodDecl,
                                llvm::Constant *AtomicHelperFn);
  
    void GenerateObjCCtorDtorMethod(ObjCImplementationDecl *IMP,
                                    ObjCMethodDecl *MD, bool ctor);
  
    /// GenerateObjCSetter - Synthesize an Objective-C property setter function
    /// for the given property.
    void GenerateObjCSetter(ObjCImplementationDecl *IMP,
                            const ObjCPropertyImplDecl *PID);
    void generateObjCSetterBody(const ObjCImplementationDecl *classImpl,
                                const ObjCPropertyImplDecl *propImpl,
                                llvm::Constant *AtomicHelperFn);
  
    //===--------------------------------------------------------------------===//
    //                                  Block Bits
    //===--------------------------------------------------------------------===//
  
    /// Emit block literal.
    /// \return an LLVM value which is a pointer to a struct which contains
    /// information about the block, including the block invoke function, the
    /// captured variables, etc.
    llvm::Value *EmitBlockLiteral(const BlockExpr *);
  
    llvm::Function *GenerateBlockFunction(GlobalDecl GD,
                                          const CGBlockInfo &Info,
                                          const DeclMapTy &ldm,
                                          bool IsLambdaConversionToBlock,
                                          bool BuildGlobalBlock);
  
    /// Check if \p T is a C++ class that has a destructor that can throw.
    static bool cxxDestructorCanThrow(QualType T);
  
    llvm::Constant *GenerateCopyHelperFunction(const CGBlockInfo &blockInfo);
    llvm::Constant *GenerateDestroyHelperFunction(const CGBlockInfo &blockInfo);
    llvm::Constant *GenerateObjCAtomicSetterCopyHelperFunction(
                                               const ObjCPropertyImplDecl *PID);
    llvm::Constant *GenerateObjCAtomicGetterCopyHelperFunction(
                                               const ObjCPropertyImplDecl *PID);
    llvm::Value *EmitBlockCopyAndAutorelease(llvm::Value *Block, QualType Ty);
  
    void BuildBlockRelease(llvm::Value *DeclPtr, BlockFieldFlags flags,
                           bool CanThrow);
  
    class AutoVarEmission;
  
    void emitByrefStructureInit(const AutoVarEmission &emission);
  
    /// Enter a cleanup to destroy a __block variable.  Note that this
    /// cleanup should be a no-op if the variable hasn't left the stack
    /// yet; if a cleanup is required for the variable itself, that needs
    /// to be done externally.
    ///
    /// \param Kind Cleanup kind.
    ///
    /// \param Addr When \p LoadBlockVarAddr is false, the address of the __block
    /// structure that will be passed to _Block_object_dispose. When
    /// \p LoadBlockVarAddr is true, the address of the field of the block
    /// structure that holds the address of the __block structure.
    ///
    /// \param Flags The flag that will be passed to _Block_object_dispose.
    ///
    /// \param LoadBlockVarAddr Indicates whether we need to emit a load from
    /// \p Addr to get the address of the __block structure.
    void enterByrefCleanup(CleanupKind Kind, Address Addr, BlockFieldFlags Flags,
                           bool LoadBlockVarAddr, bool CanThrow);
  
    void setBlockContextParameter(const ImplicitParamDecl *D, unsigned argNum,
                                  llvm::Value *ptr);
  
    Address LoadBlockStruct();
    Address GetAddrOfBlockDecl(const VarDecl *var);
  
    /// BuildBlockByrefAddress - Computes the location of the
    /// data in a variable which is declared as __block.
    Address emitBlockByrefAddress(Address baseAddr, const VarDecl *V,
                                  bool followForward = true);
    Address emitBlockByrefAddress(Address baseAddr,
                                  const BlockByrefInfo &info,
                                  bool followForward,
                                  const llvm::Twine &name);
  
    const BlockByrefInfo &getBlockByrefInfo(const VarDecl *var);
  
    QualType BuildFunctionArgList(GlobalDecl GD, FunctionArgList &Args);
  
    void GenerateCode(GlobalDecl GD, llvm::Function *Fn,
                      const CGFunctionInfo &FnInfo);
  
    /// Annotate the function with an attribute that disables TSan checking at
    /// runtime.
    void markAsIgnoreThreadCheckingAtRuntime(llvm::Function *Fn);
  
    /// Emit code for the start of a function.
    /// \param Loc       The location to be associated with the function.
    /// \param StartLoc  The location of the function body.
    void StartFunction(GlobalDecl GD,
                       QualType RetTy,
                       llvm::Function *Fn,
                       const CGFunctionInfo &FnInfo,
                       const FunctionArgList &Args,
                       SourceLocation Loc = SourceLocation(),
                       SourceLocation StartLoc = SourceLocation());
  
    static bool IsConstructorDelegationValid(const CXXConstructorDecl *Ctor);
  
    void EmitConstructorBody(FunctionArgList &Args);
    void EmitDestructorBody(FunctionArgList &Args);
    void emitImplicitAssignmentOperatorBody(FunctionArgList &Args);
    void EmitFunctionBody(const Stmt *Body);
    void EmitBlockWithFallThrough(llvm::BasicBlock *BB, const Stmt *S);
  
    void EmitForwardingCallToLambda(const CXXMethodDecl *LambdaCallOperator,
                                    CallArgList &CallArgs);
    void EmitLambdaBlockInvokeBody();
    void EmitLambdaDelegatingInvokeBody(const CXXMethodDecl *MD);
    void EmitLambdaStaticInvokeBody(const CXXMethodDecl *MD);
    void EmitLambdaVLACapture(const VariableArrayType *VAT, LValue LV) {
      EmitStoreThroughLValue(RValue::get(VLASizeMap[VAT->getSizeExpr()]), LV);
    }
    void EmitAsanPrologueOrEpilogue(bool Prologue);
  
    /// Emit the unified return block, trying to avoid its emission when
    /// possible.
    /// \return The debug location of the user written return statement if the
    /// return block is is avoided.
    llvm::DebugLoc EmitReturnBlock();
  
    /// FinishFunction - Complete IR generation of the current function. It is
    /// legal to call this function even if there is no current insertion point.
    void FinishFunction(SourceLocation EndLoc=SourceLocation());
  
    void StartThunk(llvm::Function *Fn, GlobalDecl GD,
                    const CGFunctionInfo &FnInfo, bool IsUnprototyped);
  
    void EmitCallAndReturnForThunk(llvm::FunctionCallee Callee,
                                   const ThunkInfo *Thunk, bool IsUnprototyped);
  
    void FinishThunk();
  
    /// Emit a musttail call for a thunk with a potentially adjusted this pointer.
    void EmitMustTailThunk(GlobalDecl GD, llvm::Value *AdjustedThisPtr,
                           llvm::FunctionCallee Callee);
  
    /// Generate a thunk for the given method.
    void generateThunk(llvm::Function *Fn, const CGFunctionInfo &FnInfo,
                       GlobalDecl GD, const ThunkInfo &Thunk,
                       bool IsUnprototyped);
  
    llvm::Function *GenerateVarArgsThunk(llvm::Function *Fn,
                                         const CGFunctionInfo &FnInfo,
                                         GlobalDecl GD, const ThunkInfo &Thunk);
  
    void EmitCtorPrologue(const CXXConstructorDecl *CD, CXXCtorType Type,
                          FunctionArgList &Args);
  
    void EmitInitializerForField(FieldDecl *Field, LValue LHS, Expr *Init);
  
    /// Struct with all information about dynamic [sub]class needed to set vptr.
    struct VPtr {
      BaseSubobject Base;
      const CXXRecordDecl *NearestVBase;
      CharUnits OffsetFromNearestVBase;
      const CXXRecordDecl *VTableClass;
    };
  
    /// Initialize the vtable pointer of the given subobject.
    void InitializeVTablePointer(const VPtr &vptr);
  
    typedef llvm::SmallVector<VPtr, 4> VPtrsVector;
  
    typedef llvm::SmallPtrSet<const CXXRecordDecl *, 4> VisitedVirtualBasesSetTy;
    VPtrsVector getVTablePointers(const CXXRecordDecl *VTableClass);
  
    void getVTablePointers(BaseSubobject Base, const CXXRecordDecl *NearestVBase,
                           CharUnits OffsetFromNearestVBase,
                           bool BaseIsNonVirtualPrimaryBase,
                           const CXXRecordDecl *VTableClass,
                           VisitedVirtualBasesSetTy &VBases, VPtrsVector &vptrs);
  
    void InitializeVTablePointers(const CXXRecordDecl *ClassDecl);
  
    /// GetVTablePtr - Return the Value of the vtable pointer member pointed
    /// to by This.
    llvm::Value *GetVTablePtr(Address This, llvm::Type *VTableTy,
                              const CXXRecordDecl *VTableClass);
  
    enum CFITypeCheckKind {
      CFITCK_VCall,
      CFITCK_NVCall,
      CFITCK_DerivedCast,
      CFITCK_UnrelatedCast,
      CFITCK_ICall,
      CFITCK_NVMFCall,
      CFITCK_VMFCall,
    };
  
    /// Derived is the presumed address of an object of type T after a
    /// cast. If T is a polymorphic class type, emit a check that the virtual
    /// table for Derived belongs to a class derived from T.
    void EmitVTablePtrCheckForCast(QualType T, llvm::Value *Derived,
                                   bool MayBeNull, CFITypeCheckKind TCK,
                                   SourceLocation Loc);
  
    /// EmitVTablePtrCheckForCall - Virtual method MD is being called via VTable.
    /// If vptr CFI is enabled, emit a check that VTable is valid.
    void EmitVTablePtrCheckForCall(const CXXRecordDecl *RD, llvm::Value *VTable,
                                   CFITypeCheckKind TCK, SourceLocation Loc);
  
    /// EmitVTablePtrCheck - Emit a check that VTable is a valid virtual table for
    /// RD using llvm.type.test.
    void EmitVTablePtrCheck(const CXXRecordDecl *RD, llvm::Value *VTable,
                            CFITypeCheckKind TCK, SourceLocation Loc);
  
    /// If whole-program virtual table optimization is enabled, emit an assumption
    /// that VTable is a member of RD's type identifier. Or, if vptr CFI is
    /// enabled, emit a check that VTable is a member of RD's type identifier.
    void EmitTypeMetadataCodeForVCall(const CXXRecordDecl *RD,
                                      llvm::Value *VTable, SourceLocation Loc);
  
    /// Returns whether we should perform a type checked load when loading a
    /// virtual function for virtual calls to members of RD. This is generally
    /// true when both vcall CFI and whole-program-vtables are enabled.
    bool ShouldEmitVTableTypeCheckedLoad(const CXXRecordDecl *RD);
  
    /// Emit a type checked load from the given vtable.
    llvm::Value *EmitVTableTypeCheckedLoad(const CXXRecordDecl *RD, llvm::Value *VTable,
                                           uint64_t VTableByteOffset);
  
    /// EnterDtorCleanups - Enter the cleanups necessary to complete the
    /// given phase of destruction for a destructor.  The end result
    /// should call destructors on members and base classes in reverse
    /// order of their construction.
    void EnterDtorCleanups(const CXXDestructorDecl *Dtor, CXXDtorType Type);
  
    /// ShouldInstrumentFunction - Return true if the current function should be
    /// instrumented with __cyg_profile_func_* calls
    bool ShouldInstrumentFunction();
  
    /// ShouldXRayInstrument - Return true if the current function should be
    /// instrumented with XRay nop sleds.
    bool ShouldXRayInstrumentFunction() const;
  
    /// AlwaysEmitXRayCustomEvents - Return true if we must unconditionally emit
    /// XRay custom event handling calls.
    bool AlwaysEmitXRayCustomEvents() const;
  
    /// AlwaysEmitXRayTypedEvents - Return true if clang must unconditionally emit
    /// XRay typed event handling calls.
    bool AlwaysEmitXRayTypedEvents() const;
  
    /// Encode an address into a form suitable for use in a function prologue.
    llvm::Constant *EncodeAddrForUseInPrologue(llvm::Function *F,
                                               llvm::Constant *Addr);
  
    /// Decode an address used in a function prologue, encoded by \c
    /// EncodeAddrForUseInPrologue.
    llvm::Value *DecodeAddrUsedInPrologue(llvm::Value *F,
                                          llvm::Value *EncodedAddr);
  
    /// EmitFunctionProlog - Emit the target specific LLVM code to load the
    /// arguments for the given function. This is also responsible for naming the
    /// LLVM function arguments.
    void EmitFunctionProlog(const CGFunctionInfo &FI,
                            llvm::Function *Fn,
                            const FunctionArgList &Args);
  
    /// EmitFunctionEpilog - Emit the target specific LLVM code to return the
    /// given temporary.
    void EmitFunctionEpilog(const CGFunctionInfo &FI, bool EmitRetDbgLoc,
                            SourceLocation EndLoc);
  
    /// Emit a test that checks if the return value \p RV is nonnull.
    void EmitReturnValueCheck(llvm::Value *RV);
  
    /// EmitStartEHSpec - Emit the start of the exception spec.
    void EmitStartEHSpec(const Decl *D);
  
    /// EmitEndEHSpec - Emit the end of the exception spec.
    void EmitEndEHSpec(const Decl *D);
  
    /// getTerminateLandingPad - Return a landing pad that just calls terminate.
    llvm::BasicBlock *getTerminateLandingPad();
  
    /// getTerminateLandingPad - Return a cleanup funclet that just calls
    /// terminate.
    llvm::BasicBlock *getTerminateFunclet();
  
    /// getTerminateHandler - Return a handler (not a landing pad, just
    /// a catch handler) that just calls terminate.  This is used when
    /// a terminate scope encloses a try.
    llvm::BasicBlock *getTerminateHandler();
  
    llvm::Type *ConvertTypeForMem(QualType T);
    llvm::Type *ConvertType(QualType T);
    llvm::Type *ConvertType(const TypeDecl *T) {
      return ConvertType(getContext().getTypeDeclType(T));
    }
  
    /// LoadObjCSelf - Load the value of self. This function is only valid while
    /// generating code for an Objective-C method.
    llvm::Value *LoadObjCSelf();
  
    /// TypeOfSelfObject - Return type of object that this self represents.
    QualType TypeOfSelfObject();
  
    /// getEvaluationKind - Return the TypeEvaluationKind of QualType \c T.
    static TypeEvaluationKind getEvaluationKind(QualType T);
  
    static bool hasScalarEvaluationKind(QualType T) {
      return getEvaluationKind(T) == TEK_Scalar;
    }
  
    static bool hasAggregateEvaluationKind(QualType T) {
      return getEvaluationKind(T) == TEK_Aggregate;
    }
  
    /// createBasicBlock - Create an LLVM basic block.
    llvm::BasicBlock *createBasicBlock(const Twine &name = "",
                                       llvm::Function *parent = nullptr,
                                       llvm::BasicBlock *before = nullptr) {
      return llvm::BasicBlock::Create(getLLVMContext(), name, parent, before);
    }
  
    /// getBasicBlockForLabel - Return the LLVM basicblock that the specified
    /// label maps to.
    JumpDest getJumpDestForLabel(const LabelDecl *S);
  
    /// SimplifyForwardingBlocks - If the given basic block is only a branch to
    /// another basic block, simplify it. This assumes that no other code could
    /// potentially reference the basic block.
    void SimplifyForwardingBlocks(llvm::BasicBlock *BB);
  
    /// EmitBlock - Emit the given block \arg BB and set it as the insert point,
    /// adding a fall-through branch from the current insert block if
    /// necessary. It is legal to call this function even if there is no current
    /// insertion point.
    ///
    /// IsFinished - If true, indicates that the caller has finished emitting
    /// branches to the given block and does not expect to emit code into it. This
    /// means the block can be ignored if it is unreachable.
    void EmitBlock(llvm::BasicBlock *BB, bool IsFinished=false);
  
    /// EmitBlockAfterUses - Emit the given block somewhere hopefully
    /// near its uses, and leave the insertion point in it.
    void EmitBlockAfterUses(llvm::BasicBlock *BB);
  
    /// EmitBranch - Emit a branch to the specified basic block from the current
    /// insert block, taking care to avoid creation of branches from dummy
    /// blocks. It is legal to call this function even if there is no current
    /// insertion point.
    ///
    /// This function clears the current insertion point. The caller should follow
    /// calls to this function with calls to Emit*Block prior to generation new
    /// code.
    void EmitBranch(llvm::BasicBlock *Block);
  
    /// HaveInsertPoint - True if an insertion point is defined. If not, this
    /// indicates that the current code being emitted is unreachable.
    bool HaveInsertPoint() const {
      return Builder.GetInsertBlock() != nullptr;
    }
  
    /// EnsureInsertPoint - Ensure that an insertion point is defined so that
    /// emitted IR has a place to go. Note that by definition, if this function
    /// creates a block then that block is unreachable; callers may do better to
    /// detect when no insertion point is defined and simply skip IR generation.
    void EnsureInsertPoint() {
      if (!HaveInsertPoint())
        EmitBlock(createBasicBlock());
    }
  
    /// ErrorUnsupported - Print out an error that codegen doesn't support the
    /// specified stmt yet.
    void ErrorUnsupported(const Stmt *S, const char *Type);
  
    //===--------------------------------------------------------------------===//
    //                                  Helpers
    //===--------------------------------------------------------------------===//
  
    LValue MakeAddrLValue(Address Addr, QualType T,
                          AlignmentSource Source = AlignmentSource::Type) {
      return LValue::MakeAddr(Addr, T, getContext(), LValueBaseInfo(Source),
                              CGM.getTBAAAccessInfo(T));
    }
  
    LValue MakeAddrLValue(Address Addr, QualType T, LValueBaseInfo BaseInfo,
                          TBAAAccessInfo TBAAInfo) {
      return LValue::MakeAddr(Addr, T, getContext(), BaseInfo, TBAAInfo);
    }
  
    LValue MakeAddrLValue(llvm::Value *V, QualType T, CharUnits Alignment,
                          AlignmentSource Source = AlignmentSource::Type) {
      return LValue::MakeAddr(Address(V, Alignment), T, getContext(),
                              LValueBaseInfo(Source), CGM.getTBAAAccessInfo(T));
    }
  
    LValue MakeAddrLValue(llvm::Value *V, QualType T, CharUnits Alignment,
                          LValueBaseInfo BaseInfo, TBAAAccessInfo TBAAInfo) {
      return LValue::MakeAddr(Address(V, Alignment), T, getContext(),
                              BaseInfo, TBAAInfo);
    }
  
    LValue MakeNaturalAlignPointeeAddrLValue(llvm::Value *V, QualType T);
    LValue MakeNaturalAlignAddrLValue(llvm::Value *V, QualType T);
  
    Address EmitLoadOfReference(LValue RefLVal,
                                LValueBaseInfo *PointeeBaseInfo = nullptr,
                                TBAAAccessInfo *PointeeTBAAInfo = nullptr);
    LValue EmitLoadOfReferenceLValue(LValue RefLVal);
    LValue EmitLoadOfReferenceLValue(Address RefAddr, QualType RefTy,
                                     AlignmentSource Source =
                                         AlignmentSource::Type) {
      LValue RefLVal = MakeAddrLValue(RefAddr, RefTy, LValueBaseInfo(Source),
                                      CGM.getTBAAAccessInfo(RefTy));
      return EmitLoadOfReferenceLValue(RefLVal);
    }
  
    Address EmitLoadOfPointer(Address Ptr, const PointerType *PtrTy,
                              LValueBaseInfo *BaseInfo = nullptr,
                              TBAAAccessInfo *TBAAInfo = nullptr);
    LValue EmitLoadOfPointerLValue(Address Ptr, const PointerType *PtrTy);
  
    /// CreateTempAlloca - This creates an alloca and inserts it into the entry
    /// block if \p ArraySize is nullptr, otherwise inserts it at the current
    /// insertion point of the builder. The caller is responsible for setting an
    /// appropriate alignment on
    /// the alloca.
    ///
    /// \p ArraySize is the number of array elements to be allocated if it
    ///    is not nullptr.
    ///
    /// LangAS::Default is the address space of pointers to local variables and
    /// temporaries, as exposed in the source language. In certain
    /// configurations, this is not the same as the alloca address space, and a
    /// cast is needed to lift the pointer from the alloca AS into
    /// LangAS::Default. This can happen when the target uses a restricted
    /// address space for the stack but the source language requires
    /// LangAS::Default to be a generic address space. The latter condition is
    /// common for most programming languages; OpenCL is an exception in that
    /// LangAS::Default is the private address space, which naturally maps
    /// to the stack.
    ///
    /// Because the address of a temporary is often exposed to the program in
    /// various ways, this function will perform the cast. The original alloca
    /// instruction is returned through \p Alloca if it is not nullptr.
    ///
    /// The cast is not performaed in CreateTempAllocaWithoutCast. This is
    /// more efficient if the caller knows that the address will not be exposed.
    llvm::AllocaInst *CreateTempAlloca(llvm::Type *Ty, const Twine &Name = "tmp",
                                       llvm::Value *ArraySize = nullptr);
    Address CreateTempAlloca(llvm::Type *Ty, CharUnits align,
                             const Twine &Name = "tmp",
                             llvm::Value *ArraySize = nullptr,
                             Address *Alloca = nullptr);
    Address CreateTempAllocaWithoutCast(llvm::Type *Ty, CharUnits align,
                                        const Twine &Name = "tmp",
                                        llvm::Value *ArraySize = nullptr);
  
    /// CreateDefaultAlignedTempAlloca - This creates an alloca with the
    /// default ABI alignment of the given LLVM type.
    ///
    /// IMPORTANT NOTE: This is *not* generally the right alignment for
    /// any given AST type that happens to have been lowered to the
    /// given IR type.  This should only ever be used for function-local,
    /// IR-driven manipulations like saving and restoring a value.  Do
    /// not hand this address off to arbitrary IRGen routines, and especially
    /// do not pass it as an argument to a function that might expect a
    /// properly ABI-aligned value.
    Address CreateDefaultAlignTempAlloca(llvm::Type *Ty,
                                         const Twine &Name = "tmp");
  
    /// InitTempAlloca - Provide an initial value for the given alloca which
    /// will be observable at all locations in the function.
    ///
    /// The address should be something that was returned from one of
    /// the CreateTempAlloca or CreateMemTemp routines, and the
    /// initializer must be valid in the entry block (i.e. it must
    /// either be a constant or an argument value).
    void InitTempAlloca(Address Alloca, llvm::Value *Value);
  
    /// CreateIRTemp - Create a temporary IR object of the given type, with
    /// appropriate alignment. This routine should only be used when an temporary
    /// value needs to be stored into an alloca (for example, to avoid explicit
    /// PHI construction), but the type is the IR type, not the type appropriate
    /// for storing in memory.
    ///
    /// That is, this is exactly equivalent to CreateMemTemp, but calling
    /// ConvertType instead of ConvertTypeForMem.
    Address CreateIRTemp(QualType T, const Twine &Name = "tmp");
  
    /// CreateMemTemp - Create a temporary memory object of the given type, with
    /// appropriate alignmen and cast it to the default address space. Returns
    /// the original alloca instruction by \p Alloca if it is not nullptr.
    Address CreateMemTemp(QualType T, const Twine &Name = "tmp",
                          Address *Alloca = nullptr);
    Address CreateMemTemp(QualType T, CharUnits Align, const Twine &Name = "tmp",
                          Address *Alloca = nullptr);
  
    /// CreateMemTemp - Create a temporary memory object of the given type, with
    /// appropriate alignmen without casting it to the default address space.
    Address CreateMemTempWithoutCast(QualType T, const Twine &Name = "tmp");
    Address CreateMemTempWithoutCast(QualType T, CharUnits Align,
                                     const Twine &Name = "tmp");
  
    /// CreateAggTemp - Create a temporary memory object for the given
    /// aggregate type.
    AggValueSlot CreateAggTemp(QualType T, const Twine &Name = "tmp",
                               Address *Alloca = nullptr) {
      return AggValueSlot::forAddr(CreateMemTemp(T, Name, Alloca),
                                   T.getQualifiers(),
                                   AggValueSlot::IsNotDestructed,
                                   AggValueSlot::DoesNotNeedGCBarriers,
                                   AggValueSlot::IsNotAliased,
                                   AggValueSlot::DoesNotOverlap);
    }
  
    /// Emit a cast to void* in the appropriate address space.
    llvm::Value *EmitCastToVoidPtr(llvm::Value *value);
  
    /// EvaluateExprAsBool - Perform the usual unary conversions on the specified
    /// expression and compare the result against zero, returning an Int1Ty value.
    llvm::Value *EvaluateExprAsBool(const Expr *E);
  
    /// EmitIgnoredExpr - Emit an expression in a context which ignores the result.
    void EmitIgnoredExpr(const Expr *E);
  
    /// EmitAnyExpr - Emit code to compute the specified expression which can have
    /// any type.  The result is returned as an RValue struct.  If this is an
    /// aggregate expression, the aggloc/agglocvolatile arguments indicate where
    /// the result should be returned.
    ///
    /// \param ignoreResult True if the resulting value isn't used.
    RValue EmitAnyExpr(const Expr *E,
                       AggValueSlot aggSlot = AggValueSlot::ignored(),
                       bool ignoreResult = false);
  
    // EmitVAListRef - Emit a "reference" to a va_list; this is either the address
    // or the value of the expression, depending on how va_list is defined.
    Address EmitVAListRef(const Expr *E);
  
    /// Emit a "reference" to a __builtin_ms_va_list; this is
    /// always the value of the expression, because a __builtin_ms_va_list is a
    /// pointer to a char.
    Address EmitMSVAListRef(const Expr *E);
  
    /// EmitAnyExprToTemp - Similarly to EmitAnyExpr(), however, the result will
    /// always be accessible even if no aggregate location is provided.
    RValue EmitAnyExprToTemp(const Expr *E);
  
    /// EmitAnyExprToMem - Emits the code necessary to evaluate an
    /// arbitrary expression into the given memory location.
    void EmitAnyExprToMem(const Expr *E, Address Location,
                          Qualifiers Quals, bool IsInitializer);
  
    void EmitAnyExprToExn(const Expr *E, Address Addr);
  
    /// EmitExprAsInit - Emits the code necessary to initialize a
    /// location in memory with the given initializer.
    void EmitExprAsInit(const Expr *init, const ValueDecl *D, LValue lvalue,
                        bool capturedByInit);
  
    /// hasVolatileMember - returns true if aggregate type has a volatile
    /// member.
    bool hasVolatileMember(QualType T) {
      if (const RecordType *RT = T->getAs<RecordType>()) {
        const RecordDecl *RD = cast<RecordDecl>(RT->getDecl());
        return RD->hasVolatileMember();
      }
      return false;
    }
  
    /// Determine whether a return value slot may overlap some other object.
    AggValueSlot::Overlap_t getOverlapForReturnValue() {
      // FIXME: Assuming no overlap here breaks guaranteed copy elision for base
      // class subobjects. These cases may need to be revisited depending on the
      // resolution of the relevant core issue.
      return AggValueSlot::DoesNotOverlap;
    }
  
    /// Determine whether a field initialization may overlap some other object.
    AggValueSlot::Overlap_t getOverlapForFieldInit(const FieldDecl *FD);
  
    /// Determine whether a base class initialization may overlap some other
    /// object.
    AggValueSlot::Overlap_t getOverlapForBaseInit(const CXXRecordDecl *RD,
                                                  const CXXRecordDecl *BaseRD,
                                                  bool IsVirtual);
  
    /// Emit an aggregate assignment.
    void EmitAggregateAssign(LValue Dest, LValue Src, QualType EltTy) {
      bool IsVolatile = hasVolatileMember(EltTy);
      EmitAggregateCopy(Dest, Src, EltTy, AggValueSlot::MayOverlap, IsVolatile);
    }
  
    void EmitAggregateCopyCtor(LValue Dest, LValue Src,
                               AggValueSlot::Overlap_t MayOverlap) {
      EmitAggregateCopy(Dest, Src, Src.getType(), MayOverlap);
    }
  
    /// EmitAggregateCopy - Emit an aggregate copy.
    ///
    /// \param isVolatile \c true iff either the source or the destination is
    ///        volatile.
    /// \param MayOverlap Whether the tail padding of the destination might be
    ///        occupied by some other object. More efficient code can often be
    ///        generated if not.
    void EmitAggregateCopy(LValue Dest, LValue Src, QualType EltTy,
                           AggValueSlot::Overlap_t MayOverlap,
                           bool isVolatile = false);
  
    /// GetAddrOfLocalVar - Return the address of a local variable.
    Address GetAddrOfLocalVar(const VarDecl *VD) {
      auto it = LocalDeclMap.find(VD);
      assert(it != LocalDeclMap.end() &&
             "Invalid argument to GetAddrOfLocalVar(), no decl!");
      return it->second;
    }
  
    /// Given an opaque value expression, return its LValue mapping if it exists,
    /// otherwise create one.
    LValue getOrCreateOpaqueLValueMapping(const OpaqueValueExpr *e);
  
    /// Given an opaque value expression, return its RValue mapping if it exists,
    /// otherwise create one.
    RValue getOrCreateOpaqueRValueMapping(const OpaqueValueExpr *e);
  
    /// Get the index of the current ArrayInitLoopExpr, if any.
    llvm::Value *getArrayInitIndex() { return ArrayInitIndex; }
  
    /// getAccessedFieldNo - Given an encoded value and a result number, return
    /// the input field number being accessed.
    static unsigned getAccessedFieldNo(unsigned Idx, const llvm::Constant *Elts);
  
    llvm::BlockAddress *GetAddrOfLabel(const LabelDecl *L);
    llvm::BasicBlock *GetIndirectGotoBlock();
  
    /// Check if \p E is a C++ "this" pointer wrapped in value-preserving casts.
    static bool IsWrappedCXXThis(const Expr *E);
  
    /// EmitNullInitialization - Generate code to set a value of the given type to
    /// null, If the type contains data member pointers, they will be initialized
    /// to -1 in accordance with the Itanium C++ ABI.
    void EmitNullInitialization(Address DestPtr, QualType Ty);
  
    /// Emits a call to an LLVM variable-argument intrinsic, either
    /// \c llvm.va_start or \c llvm.va_end.
    /// \param ArgValue A reference to the \c va_list as emitted by either
    /// \c EmitVAListRef or \c EmitMSVAListRef.
    /// \param IsStart If \c true, emits a call to \c llvm.va_start; otherwise,
    /// calls \c llvm.va_end.
    llvm::Value *EmitVAStartEnd(llvm::Value *ArgValue, bool IsStart);
  
    /// Generate code to get an argument from the passed in pointer
    /// and update it accordingly.
    /// \param VE The \c VAArgExpr for which to generate code.
    /// \param VAListAddr Receives a reference to the \c va_list as emitted by
    /// either \c EmitVAListRef or \c EmitMSVAListRef.
    /// \returns A pointer to the argument.
    // FIXME: We should be able to get rid of this method and use the va_arg
    // instruction in LLVM instead once it works well enough.
    Address EmitVAArg(VAArgExpr *VE, Address &VAListAddr);
  
    /// emitArrayLength - Compute the length of an array, even if it's a
    /// VLA, and drill down to the base element type.
    llvm::Value *emitArrayLength(const ArrayType *arrayType,
                                 QualType &baseType,
                                 Address &addr);
  
    /// EmitVLASize - Capture all the sizes for the VLA expressions in
    /// the given variably-modified type and store them in the VLASizeMap.
    ///
    /// This function can be called with a null (unreachable) insert point.
    void EmitVariablyModifiedType(QualType Ty);
  
    struct VlaSizePair {
      llvm::Value *NumElts;
      QualType Type;
  
      VlaSizePair(llvm::Value *NE, QualType T) : NumElts(NE), Type(T) {}
    };
  
    /// Return the number of elements for a single dimension
    /// for the given array type.
    VlaSizePair getVLAElements1D(const VariableArrayType *vla);
    VlaSizePair getVLAElements1D(QualType vla);
  
    /// Returns an LLVM value that corresponds to the size,
    /// in non-variably-sized elements, of a variable length array type,
    /// plus that largest non-variably-sized element type.  Assumes that
    /// the type has already been emitted with EmitVariablyModifiedType.
    VlaSizePair getVLASize(const VariableArrayType *vla);
    VlaSizePair getVLASize(QualType vla);
  
    /// LoadCXXThis - Load the value of 'this'. This function is only valid while
    /// generating code for an C++ member function.
    llvm::Value *LoadCXXThis() {
      assert(CXXThisValue && "no 'this' value for this function");
      return CXXThisValue;
    }
    Address LoadCXXThisAddress();
  
    /// LoadCXXVTT - Load the VTT parameter to base constructors/destructors have
    /// virtual bases.
    // FIXME: Every place that calls LoadCXXVTT is something
    // that needs to be abstracted properly.
    llvm::Value *LoadCXXVTT() {
      assert(CXXStructorImplicitParamValue && "no VTT value for this function");
      return CXXStructorImplicitParamValue;
    }
  
    /// GetAddressOfBaseOfCompleteClass - Convert the given pointer to a
    /// complete class to the given direct base.
    Address
    GetAddressOfDirectBaseInCompleteClass(Address Value,
                                          const CXXRecordDecl *Derived,
                                          const CXXRecordDecl *Base,
                                          bool BaseIsVirtual);
  
    static bool ShouldNullCheckClassCastValue(const CastExpr *Cast);
  
    /// GetAddressOfBaseClass - This function will add the necessary delta to the
    /// load of 'this' and returns address of the base class.
    Address GetAddressOfBaseClass(Address Value,
                                  const CXXRecordDecl *Derived,
                                  CastExpr::path_const_iterator PathBegin,
                                  CastExpr::path_const_iterator PathEnd,
                                  bool NullCheckValue, SourceLocation Loc);
  
    Address GetAddressOfDerivedClass(Address Value,
                                     const CXXRecordDecl *Derived,
                                     CastExpr::path_const_iterator PathBegin,
                                     CastExpr::path_const_iterator PathEnd,
                                     bool NullCheckValue);
  
    /// GetVTTParameter - Return the VTT parameter that should be passed to a
    /// base constructor/destructor with virtual bases.
    /// FIXME: VTTs are Itanium ABI-specific, so the definition should move
    /// to ItaniumCXXABI.cpp together with all the references to VTT.
    llvm::Value *GetVTTParameter(GlobalDecl GD, bool ForVirtualBase,
                                 bool Delegating);
  
    void EmitDelegateCXXConstructorCall(const CXXConstructorDecl *Ctor,
                                        CXXCtorType CtorType,
                                        const FunctionArgList &Args,
                                        SourceLocation Loc);
    // It's important not to confuse this and the previous function. Delegating
    // constructors are the C++0x feature. The constructor delegate optimization
    // is used to reduce duplication in the base and complete consturctors where
    // they are substantially the same.
    void EmitDelegatingCXXConstructorCall(const CXXConstructorDecl *Ctor,
                                          const FunctionArgList &Args);
  
    /// Emit a call to an inheriting constructor (that is, one that invokes a
    /// constructor inherited from a base class) by inlining its definition. This
    /// is necessary if the ABI does not support forwarding the arguments to the
    /// base class constructor (because they're variadic or similar).
    void EmitInlinedInheritingCXXConstructorCall(const CXXConstructorDecl *Ctor,
                                                 CXXCtorType CtorType,
                                                 bool ForVirtualBase,
                                                 bool Delegating,
                                                 CallArgList &Args);
  
    /// Emit a call to a constructor inherited from a base class, passing the
    /// current constructor's arguments along unmodified (without even making
    /// a copy).
    void EmitInheritedCXXConstructorCall(const CXXConstructorDecl *D,
                                         bool ForVirtualBase, Address This,
                                         bool InheritedFromVBase,
                                         const CXXInheritedCtorInitExpr *E);
  
    void EmitCXXConstructorCall(const CXXConstructorDecl *D, CXXCtorType Type,
                                bool ForVirtualBase, bool Delegating,
                                AggValueSlot ThisAVS, const CXXConstructExpr *E);
  
    void EmitCXXConstructorCall(const CXXConstructorDecl *D, CXXCtorType Type,
                                bool ForVirtualBase, bool Delegating,
                                Address This, CallArgList &Args,
                                AggValueSlot::Overlap_t Overlap,
                                SourceLocation Loc, bool NewPointerIsChecked);
  
    /// Emit assumption load for all bases. Requires to be be called only on
    /// most-derived class and not under construction of the object.
    void EmitVTableAssumptionLoads(const CXXRecordDecl *ClassDecl, Address This);
  
    /// Emit assumption that vptr load == global vtable.
    void EmitVTableAssumptionLoad(const VPtr &vptr, Address This);
  
    void EmitSynthesizedCXXCopyCtorCall(const CXXConstructorDecl *D,
                                        Address This, Address Src,
                                        const CXXConstructExpr *E);
  
    void EmitCXXAggrConstructorCall(const CXXConstructorDecl *D,
                                    const ArrayType *ArrayTy,
                                    Address ArrayPtr,
                                    const CXXConstructExpr *E,
                                    bool NewPointerIsChecked,
                                    bool ZeroInitialization = false);
  
    void EmitCXXAggrConstructorCall(const CXXConstructorDecl *D,
                                    llvm::Value *NumElements,
                                    Address ArrayPtr,
                                    const CXXConstructExpr *E,
                                    bool NewPointerIsChecked,
                                    bool ZeroInitialization = false);
  
    static Destroyer destroyCXXObject;
  
    void EmitCXXDestructorCall(const CXXDestructorDecl *D, CXXDtorType Type,
                               bool ForVirtualBase, bool Delegating, Address This,
                               QualType ThisTy);
  
    void EmitNewArrayInitializer(const CXXNewExpr *E, QualType elementType,
                                 llvm::Type *ElementTy, Address NewPtr,
                                 llvm::Value *NumElements,
                                 llvm::Value *AllocSizeWithoutCookie);
  
    void EmitCXXTemporary(const CXXTemporary *Temporary, QualType TempType,
                          Address Ptr);
  
    void EmitSehCppScopeBegin();
    void EmitSehCppScopeEnd();
    void EmitSehTryScopeBegin();
    void EmitSehTryScopeEnd();
  
    llvm::Value *EmitLifetimeStart(llvm::TypeSize Size, llvm::Value *Addr);
    void EmitLifetimeEnd(llvm::Value *Size, llvm::Value *Addr);
  
    llvm::Value *EmitCXXNewExpr(const CXXNewExpr *E);
    void EmitCXXDeleteExpr(const CXXDeleteExpr *E);
  
    void EmitDeleteCall(const FunctionDecl *DeleteFD, llvm::Value *Ptr,
                        QualType DeleteTy, llvm::Value *NumElements = nullptr,
                        CharUnits CookieSize = CharUnits());
  
    RValue EmitBuiltinNewDeleteCall(const FunctionProtoType *Type,
                                    const CallExpr *TheCallExpr, bool IsDelete);
  
    llvm::Value *EmitCXXTypeidExpr(const CXXTypeidExpr *E);
    llvm::Value *EmitDynamicCast(Address V, const CXXDynamicCastExpr *DCE);
    Address EmitCXXUuidofExpr(const CXXUuidofExpr *E);
  
    /// Situations in which we might emit a check for the suitability of a
    /// pointer or glvalue. Needs to be kept in sync with ubsan_handlers.cpp in
    /// compiler-rt.
    enum TypeCheckKind {
      /// Checking the operand of a load. Must be suitably sized and aligned.
      TCK_Load,
      /// Checking the destination of a store. Must be suitably sized and aligned.
      TCK_Store,
      /// Checking the bound value in a reference binding. Must be suitably sized
      /// and aligned, but is not required to refer to an object (until the
      /// reference is used), per core issue 453.
      TCK_ReferenceBinding,
      /// Checking the object expression in a non-static data member access. Must
      /// be an object within its lifetime.
      TCK_MemberAccess,
      /// Checking the 'this' pointer for a call to a non-static member function.
      /// Must be an object within its lifetime.
      TCK_MemberCall,
      /// Checking the 'this' pointer for a constructor call.
      TCK_ConstructorCall,
      /// Checking the operand of a static_cast to a derived pointer type. Must be
      /// null or an object within its lifetime.
      TCK_DowncastPointer,
      /// Checking the operand of a static_cast to a derived reference type. Must
      /// be an object within its lifetime.
      TCK_DowncastReference,
      /// Checking the operand of a cast to a base object. Must be suitably sized
      /// and aligned.
      TCK_Upcast,
      /// Checking the operand of a cast to a virtual base object. Must be an
      /// object within its lifetime.
      TCK_UpcastToVirtualBase,
      /// Checking the value assigned to a _Nonnull pointer. Must not be null.
      TCK_NonnullAssign,
      /// Checking the operand of a dynamic_cast or a typeid expression.  Must be
      /// null or an object within its lifetime.
      TCK_DynamicOperation
    };
  
    /// Determine whether the pointer type check \p TCK permits null pointers.
    static bool isNullPointerAllowed(TypeCheckKind TCK);
  
    /// Determine whether the pointer type check \p TCK requires a vptr check.
    static bool isVptrCheckRequired(TypeCheckKind TCK, QualType Ty);
  
    /// Whether any type-checking sanitizers are enabled. If \c false,
    /// calls to EmitTypeCheck can be skipped.
    bool sanitizePerformTypeCheck() const;
  
    /// Emit a check that \p V is the address of storage of the
    /// appropriate size and alignment for an object of type \p Type
    /// (or if ArraySize is provided, for an array of that bound).
    void EmitTypeCheck(TypeCheckKind TCK, SourceLocation Loc, llvm::Value *V,
                       QualType Type, CharUnits Alignment = CharUnits::Zero(),
                       SanitizerSet SkippedChecks = SanitizerSet(),
                       llvm::Value *ArraySize = nullptr);
  
    /// Emit a check that \p Base points into an array object, which
    /// we can access at index \p Index. \p Accessed should be \c false if we
    /// this expression is used as an lvalue, for instance in "&Arr[Idx]".
    void EmitBoundsCheck(const Expr *E, const Expr *Base, llvm::Value *Index,
                         QualType IndexType, bool Accessed);
  
    llvm::Value *EmitScalarPrePostIncDec(const UnaryOperator *E, LValue LV,
                                         bool isInc, bool isPre);
    ComplexPairTy EmitComplexPrePostIncDec(const UnaryOperator *E, LValue LV,
                                           bool isInc, bool isPre);
  
    /// Converts Location to a DebugLoc, if debug information is enabled.
    llvm::DebugLoc SourceLocToDebugLoc(SourceLocation Location);
  
    /// Get the record field index as represented in debug info.
    unsigned getDebugInfoFIndex(const RecordDecl *Rec, unsigned FieldIndex);
  
  
    //===--------------------------------------------------------------------===//
    //                            Declaration Emission
    //===--------------------------------------------------------------------===//
  
    /// EmitDecl - Emit a declaration.
    ///
    /// This function can be called with a null (unreachable) insert point.
    void EmitDecl(const Decl &D);
  
    /// EmitVarDecl - Emit a local variable declaration.
    ///
    /// This function can be called with a null (unreachable) insert point.
    void EmitVarDecl(const VarDecl &D);
  
    void EmitScalarInit(const Expr *init, const ValueDecl *D, LValue lvalue,
                        bool capturedByInit);
  
    typedef void SpecialInitFn(CodeGenFunction &Init, const VarDecl &D,
                               llvm::Value *Address);
  
    /// Determine whether the given initializer is trivial in the sense
    /// that it requires no code to be generated.
    bool isTrivialInitializer(const Expr *Init);
  
    /// EmitAutoVarDecl - Emit an auto variable declaration.
    ///
    /// This function can be called with a null (unreachable) insert point.
    void EmitAutoVarDecl(const VarDecl &D);
  
    class AutoVarEmission {
      friend class CodeGenFunction;
  
      const VarDecl *Variable;
  
      /// The address of the alloca for languages with explicit address space
      /// (e.g. OpenCL) or alloca casted to generic pointer for address space
      /// agnostic languages (e.g. C++). Invalid if the variable was emitted
      /// as a global constant.
      Address Addr;
  
      llvm::Value *NRVOFlag;
  
      /// True if the variable is a __block variable that is captured by an
      /// escaping block.
      bool IsEscapingByRef;
  
      /// True if the variable is of aggregate type and has a constant
      /// initializer.
      bool IsConstantAggregate;
  
      /// Non-null if we should use lifetime annotations.
      llvm::Value *SizeForLifetimeMarkers;
  
      /// Address with original alloca instruction. Invalid if the variable was
      /// emitted as a global constant.
      Address AllocaAddr;
  
      struct Invalid {};
      AutoVarEmission(Invalid)
          : Variable(nullptr), Addr(Address::invalid()),
            AllocaAddr(Address::invalid()) {}
  
      AutoVarEmission(const VarDecl &variable)
          : Variable(&variable), Addr(Address::invalid()), NRVOFlag(nullptr),
            IsEscapingByRef(false), IsConstantAggregate(false),
            SizeForLifetimeMarkers(nullptr), AllocaAddr(Address::invalid()) {}
  
      bool wasEmittedAsGlobal() const { return !Addr.isValid(); }
  
    public:
      static AutoVarEmission invalid() { return AutoVarEmission(Invalid()); }
  
      bool useLifetimeMarkers() const {
        return SizeForLifetimeMarkers != nullptr;
      }
      llvm::Value *getSizeForLifetimeMarkers() const {
        assert(useLifetimeMarkers());
        return SizeForLifetimeMarkers;
      }
  
      /// Returns the raw, allocated address, which is not necessarily
      /// the address of the object itself. It is casted to default
      /// address space for address space agnostic languages.
      Address getAllocatedAddress() const {
        return Addr;
      }
  
      /// Returns the address for the original alloca instruction.
      Address getOriginalAllocatedAddress() const { return AllocaAddr; }
  
      /// Returns the address of the object within this declaration.
      /// Note that this does not chase the forwarding pointer for
      /// __block decls.
      Address getObjectAddress(CodeGenFunction &CGF) const {
        if (!IsEscapingByRef) return Addr;
  
        return CGF.emitBlockByrefAddress(Addr, Variable, /*forward*/ false);
      }
    };
    AutoVarEmission EmitAutoVarAlloca(const VarDecl &var);
    void EmitAutoVarInit(const AutoVarEmission &emission);
    void EmitAutoVarCleanups(const AutoVarEmission &emission);
    void emitAutoVarTypeCleanup(const AutoVarEmission &emission,
                                QualType::DestructionKind dtorKind);
  
    /// Emits the alloca and debug information for the size expressions for each
    /// dimension of an array. It registers the association of its (1-dimensional)
    /// QualTypes and size expression's debug node, so that CGDebugInfo can
    /// reference this node when creating the DISubrange object to describe the
    /// array types.
    void EmitAndRegisterVariableArrayDimensions(CGDebugInfo *DI,
                                                const VarDecl &D,
                                                bool EmitDebugInfo);
  
    void EmitStaticVarDecl(const VarDecl &D,
                           llvm::GlobalValue::LinkageTypes Linkage);
  
    class ParamValue {
      llvm::Value *Value;
      unsigned Alignment;
      ParamValue(llvm::Value *V, unsigned A) : Value(V), Alignment(A) {}
    public:
      static ParamValue forDirect(llvm::Value *value) {
        return ParamValue(value, 0);
      }
      static ParamValue forIndirect(Address addr) {
        assert(!addr.getAlignment().isZero());
        return ParamValue(addr.getPointer(), addr.getAlignment().getQuantity());
      }
  
      bool isIndirect() const { return Alignment != 0; }
      llvm::Value *getAnyValue() const { return Value; }
  
      llvm::Value *getDirectValue() const {
        assert(!isIndirect());
        return Value;
      }
  
      Address getIndirectAddress() const {
        assert(isIndirect());
        return Address(Value, CharUnits::fromQuantity(Alignment));
      }
    };
  
    /// EmitParmDecl - Emit a ParmVarDecl or an ImplicitParamDecl.
    void EmitParmDecl(const VarDecl &D, ParamValue Arg, unsigned ArgNo);
  
    /// protectFromPeepholes - Protect a value that we're intending to
    /// store to the side, but which will probably be used later, from
    /// aggressive peepholing optimizations that might delete it.
    ///
    /// Pass the result to unprotectFromPeepholes to declare that
    /// protection is no longer required.
    ///
    /// There's no particular reason why this shouldn't apply to
    /// l-values, it's just that no existing peepholes work on pointers.
    PeepholeProtection protectFromPeepholes(RValue rvalue);
    void unprotectFromPeepholes(PeepholeProtection protection);
  
    void emitAlignmentAssumptionCheck(llvm::Value *Ptr, QualType Ty,
                                      SourceLocation Loc,
                                      SourceLocation AssumptionLoc,
                                      llvm::Value *Alignment,
                                      llvm::Value *OffsetValue,
                                      llvm::Value *TheCheck,
                                      llvm::Instruction *Assumption);
  
    void emitAlignmentAssumption(llvm::Value *PtrValue, QualType Ty,
                                 SourceLocation Loc, SourceLocation AssumptionLoc,
                                 llvm::Value *Alignment,
                                 llvm::Value *OffsetValue = nullptr);
  
    void emitAlignmentAssumption(llvm::Value *PtrValue, const Expr *E,
                                 SourceLocation AssumptionLoc,
                                 llvm::Value *Alignment,
                                 llvm::Value *OffsetValue = nullptr);
  
    //===--------------------------------------------------------------------===//
    //                             Statement Emission
    //===--------------------------------------------------------------------===//
  
    /// EmitStopPoint - Emit a debug stoppoint if we are emitting debug info.
    void EmitStopPoint(const Stmt *S);
  
    /// EmitStmt - Emit the code for the statement \arg S. It is legal to call
    /// this function even if there is no current insertion point.
    ///
    /// This function may clear the current insertion point; callers should use
    /// EnsureInsertPoint if they wish to subsequently generate code without first
    /// calling EmitBlock, EmitBranch, or EmitStmt.
    void EmitStmt(const Stmt *S, ArrayRef<const Attr *> Attrs = None);
  
    /// EmitSimpleStmt - Try to emit a "simple" statement which does not
    /// necessarily require an insertion point or debug information; typically
    /// because the statement amounts to a jump or a container of other
    /// statements.
    ///
    /// \return True if the statement was handled.
    bool EmitSimpleStmt(const Stmt *S, ArrayRef<const Attr *> Attrs);
  
    Address EmitCompoundStmt(const CompoundStmt &S, bool GetLast = false,
                             AggValueSlot AVS = AggValueSlot::ignored());
    Address EmitCompoundStmtWithoutScope(const CompoundStmt &S,
                                         bool GetLast = false,
                                         AggValueSlot AVS =
                                                  AggValueSlot::ignored());
  
    /// EmitLabel - Emit the block for the given label. It is legal to call this
    /// function even if there is no current insertion point.
    void EmitLabel(const LabelDecl *D); // helper for EmitLabelStmt.
  
    void EmitLabelStmt(const LabelStmt &S);
    void EmitAttributedStmt(const AttributedStmt &S);
    void EmitGotoStmt(const GotoStmt &S);
    void EmitIndirectGotoStmt(const IndirectGotoStmt &S);
    void EmitIfStmt(const IfStmt &S);
  
    void EmitWhileStmt(const WhileStmt &S,
                       ArrayRef<const Attr *> Attrs = None);
    void EmitDoStmt(const DoStmt &S, ArrayRef<const Attr *> Attrs = None);
    void EmitForStmt(const ForStmt &S,
                     ArrayRef<const Attr *> Attrs = None);
    void EmitReturnStmt(const ReturnStmt &S);
    void EmitDeclStmt(const DeclStmt &S);
    void EmitBreakStmt(const BreakStmt &S);
    void EmitContinueStmt(const ContinueStmt &S);
    void EmitSwitchStmt(const SwitchStmt &S);
    void EmitDefaultStmt(const DefaultStmt &S, ArrayRef<const Attr *> Attrs);
    void EmitCaseStmt(const CaseStmt &S, ArrayRef<const Attr *> Attrs);
    void EmitCaseStmtRange(const CaseStmt &S, ArrayRef<const Attr *> Attrs);
    void EmitAsmStmt(const AsmStmt &S);
  
    void EmitObjCForCollectionStmt(const ObjCForCollectionStmt &S);
    void EmitObjCAtTryStmt(const ObjCAtTryStmt &S);
    void EmitObjCAtThrowStmt(const ObjCAtThrowStmt &S);
    void EmitObjCAtSynchronizedStmt(const ObjCAtSynchronizedStmt &S);
    void EmitObjCAutoreleasePoolStmt(const ObjCAutoreleasePoolStmt &S);
  
    void EmitCoroutineBody(const CoroutineBodyStmt &S);
    void EmitCoreturnStmt(const CoreturnStmt &S);
    RValue EmitCoawaitExpr(const CoawaitExpr &E,
                           AggValueSlot aggSlot = AggValueSlot::ignored(),
                           bool ignoreResult = false);
    LValue EmitCoawaitLValue(const CoawaitExpr *E);
    RValue EmitCoyieldExpr(const CoyieldExpr &E,
                           AggValueSlot aggSlot = AggValueSlot::ignored(),
                           bool ignoreResult = false);
    LValue EmitCoyieldLValue(const CoyieldExpr *E);
    RValue EmitCoroutineIntrinsic(const CallExpr *E, unsigned int IID);
  
    void EnterCXXTryStmt(const CXXTryStmt &S, bool IsFnTryBlock = false);
    void ExitCXXTryStmt(const CXXTryStmt &S, bool IsFnTryBlock = false);
  
    void EmitCXXTryStmt(const CXXTryStmt &S);
    void EmitSEHTryStmt(const SEHTryStmt &S);
    void EmitSEHLeaveStmt(const SEHLeaveStmt &S);
    void EnterSEHTryStmt(const SEHTryStmt &S);
    void ExitSEHTryStmt(const SEHTryStmt &S);
    void VolatilizeTryBlocks(llvm::BasicBlock *BB,
                             llvm::SmallPtrSet<llvm::BasicBlock *, 10> &V);
  
    void pushSEHCleanup(CleanupKind kind,
                        llvm::Function *FinallyFunc);
    void startOutlinedSEHHelper(CodeGenFunction &ParentCGF, bool IsFilter,
                                const Stmt *OutlinedStmt);
  
    llvm::Function *GenerateSEHFilterFunction(CodeGenFunction &ParentCGF,
                                              const SEHExceptStmt &Except);
  
    llvm::Function *GenerateSEHFinallyFunction(CodeGenFunction &ParentCGF,
                                               const SEHFinallyStmt &Finally);
  
    void EmitSEHExceptionCodeSave(CodeGenFunction &ParentCGF,
                                  llvm::Value *ParentFP,
                                  llvm::Value *EntryEBP);
    llvm::Value *EmitSEHExceptionCode();
    llvm::Value *EmitSEHExceptionInfo();
    llvm::Value *EmitSEHAbnormalTermination();
  
    /// Emit simple code for OpenMP directives in Simd-only mode.
    void EmitSimpleOMPExecutableDirective(const OMPExecutableDirective &D);
  
    /// Scan the outlined statement for captures from the parent function. For
    /// each capture, mark the capture as escaped and emit a call to
    /// llvm.localrecover. Insert the localrecover result into the LocalDeclMap.
    void EmitCapturedLocals(CodeGenFunction &ParentCGF, const Stmt *OutlinedStmt,
                            bool IsFilter);
  
    /// Recovers the address of a local in a parent function. ParentVar is the
    /// address of the variable used in the immediate parent function. It can
    /// either be an alloca or a call to llvm.localrecover if there are nested
    /// outlined functions. ParentFP is the frame pointer of the outermost parent
    /// frame.
    Address recoverAddrOfEscapedLocal(CodeGenFunction &ParentCGF,
                                      Address ParentVar,
                                      llvm::Value *ParentFP);
  
    void EmitCXXForRangeStmt(const CXXForRangeStmt &S,
                             ArrayRef<const Attr *> Attrs = None);
  
    /// Controls insertion of cancellation exit blocks in worksharing constructs.
    class OMPCancelStackRAII {
      CodeGenFunction &CGF;
  
    public:
      OMPCancelStackRAII(CodeGenFunction &CGF, OpenMPDirectiveKind Kind,
                         bool HasCancel)
          : CGF(CGF) {
        CGF.OMPCancelStack.enter(CGF, Kind, HasCancel);
      }
      ~OMPCancelStackRAII() { CGF.OMPCancelStack.exit(CGF); }
    };
  
    /// Returns calculated size of the specified type.
    llvm::Value *getTypeSize(QualType Ty);
    LValue InitCapturedStruct(const CapturedStmt &S);
    llvm::Function *EmitCapturedStmt(const CapturedStmt &S, CapturedRegionKind K);
    llvm::Function *GenerateCapturedStmtFunction(const CapturedStmt &S);
    Address GenerateCapturedStmtArgument(const CapturedStmt &S);
    llvm::Function *GenerateOpenMPCapturedStmtFunction(const CapturedStmt &S,
                                                       SourceLocation Loc);
    void GenerateOpenMPCapturedVars(const CapturedStmt &S,
                                    SmallVectorImpl<llvm::Value *> &CapturedVars);
    void emitOMPSimpleStore(LValue LVal, RValue RVal, QualType RValTy,
                            SourceLocation Loc);
    /// Perform element by element copying of arrays with type \a
    /// OriginalType from \a SrcAddr to \a DestAddr using copying procedure
    /// generated by \a CopyGen.
    ///
    /// \param DestAddr Address of the destination array.
    /// \param SrcAddr Address of the source array.
    /// \param OriginalType Type of destination and source arrays.
    /// \param CopyGen Copying procedure that copies value of single array element
    /// to another single array element.
    void EmitOMPAggregateAssign(
        Address DestAddr, Address SrcAddr, QualType OriginalType,
        const llvm::function_ref<void(Address, Address)> CopyGen);
    /// Emit proper copying of data from one variable to another.
    ///
    /// \param OriginalType Original type of the copied variables.
    /// \param DestAddr Destination address.
    /// \param SrcAddr Source address.
    /// \param DestVD Destination variable used in \a CopyExpr (for arrays, has
    /// type of the base array element).
    /// \param SrcVD Source variable used in \a CopyExpr (for arrays, has type of
    /// the base array element).
    /// \param Copy Actual copygin expression for copying data from \a SrcVD to \a
    /// DestVD.
    void EmitOMPCopy(QualType OriginalType,
                     Address DestAddr, Address SrcAddr,
                     const VarDecl *DestVD, const VarDecl *SrcVD,
                     const Expr *Copy);
    /// Emit atomic update code for constructs: \a X = \a X \a BO \a E or
    /// \a X = \a E \a BO \a E.
    ///
    /// \param X Value to be updated.
    /// \param E Update value.
    /// \param BO Binary operation for update operation.
    /// \param IsXLHSInRHSPart true if \a X is LHS in RHS part of the update
    /// expression, false otherwise.
    /// \param AO Atomic ordering of the generated atomic instructions.
    /// \param CommonGen Code generator for complex expressions that cannot be
    /// expressed through atomicrmw instruction.
    /// \returns <true, OldAtomicValue> if simple 'atomicrmw' instruction was
    /// generated, <false, RValue::get(nullptr)> otherwise.
    std::pair<bool, RValue> EmitOMPAtomicSimpleUpdateExpr(
        LValue X, RValue E, BinaryOperatorKind BO, bool IsXLHSInRHSPart,
        llvm::AtomicOrdering AO, SourceLocation Loc,
        const llvm::function_ref<RValue(RValue)> CommonGen);
    bool EmitOMPFirstprivateClause(const OMPExecutableDirective &D,
                                   OMPPrivateScope &PrivateScope);
    void EmitOMPPrivateClause(const OMPExecutableDirective &D,
                              OMPPrivateScope &PrivateScope);
    void EmitOMPUseDevicePtrClause(
        const OMPUseDevicePtrClause &C, OMPPrivateScope &PrivateScope,
        const llvm::DenseMap<const ValueDecl *, Address> &CaptureDeviceAddrMap);
    void EmitOMPUseDeviceAddrClause(
        const OMPUseDeviceAddrClause &C, OMPPrivateScope &PrivateScope,
        const llvm::DenseMap<const ValueDecl *, Address> &CaptureDeviceAddrMap);
    /// Emit code for copyin clause in \a D directive. The next code is
    /// generated at the start of outlined functions for directives:
    /// \code
    /// threadprivate_var1 = master_threadprivate_var1;
    /// operator=(threadprivate_var2, master_threadprivate_var2);
    /// ...
    /// __kmpc_barrier(&loc, global_tid);
    /// \endcode
    ///
    /// \param D OpenMP directive possibly with 'copyin' clause(s).
    /// \returns true if at least one copyin variable is found, false otherwise.
    bool EmitOMPCopyinClause(const OMPExecutableDirective &D);
    /// Emit initial code for lastprivate variables. If some variable is
    /// not also firstprivate, then the default initialization is used. Otherwise
    /// initialization of this variable is performed by EmitOMPFirstprivateClause
    /// method.
    ///
    /// \param D Directive that may have 'lastprivate' directives.
    /// \param PrivateScope Private scope for capturing lastprivate variables for
    /// proper codegen in internal captured statement.
    ///
    /// \returns true if there is at least one lastprivate variable, false
    /// otherwise.
    bool EmitOMPLastprivateClauseInit(const OMPExecutableDirective &D,
                                      OMPPrivateScope &PrivateScope);
    /// Emit final copying of lastprivate values to original variables at
    /// the end of the worksharing or simd directive.
    ///
    /// \param D Directive that has at least one 'lastprivate' directives.
    /// \param IsLastIterCond Boolean condition that must be set to 'i1 true' if
    /// it is the last iteration of the loop code in associated directive, or to
    /// 'i1 false' otherwise. If this item is nullptr, no final check is required.
    void EmitOMPLastprivateClauseFinal(const OMPExecutableDirective &D,
                                       bool NoFinals,
                                       llvm::Value *IsLastIterCond = nullptr);
    /// Emit initial code for linear clauses.
    void EmitOMPLinearClause(const OMPLoopDirective &D,
                             CodeGenFunction::OMPPrivateScope &PrivateScope);
    /// Emit final code for linear clauses.
    /// \param CondGen Optional conditional code for final part of codegen for
    /// linear clause.
    void EmitOMPLinearClauseFinal(
        const OMPLoopDirective &D,
        const llvm::function_ref<llvm::Value *(CodeGenFunction &)> CondGen);
    /// Emit initial code for reduction variables. Creates reduction copies
    /// and initializes them with the values according to OpenMP standard.
    ///
    /// \param D Directive (possibly) with the 'reduction' clause.
    /// \param PrivateScope Private scope for capturing reduction variables for
    /// proper codegen in internal captured statement.
    ///
    void EmitOMPReductionClauseInit(const OMPExecutableDirective &D,
                                    OMPPrivateScope &PrivateScope,
                                    bool ForInscan = false);
    /// Emit final update of reduction values to original variables at
    /// the end of the directive.
    ///
    /// \param D Directive that has at least one 'reduction' directives.
    /// \param ReductionKind The kind of reduction to perform.
    void EmitOMPReductionClauseFinal(const OMPExecutableDirective &D,
                                     const OpenMPDirectiveKind ReductionKind);
    /// Emit initial code for linear variables. Creates private copies
    /// and initializes them with the values according to OpenMP standard.
    ///
    /// \param D Directive (possibly) with the 'linear' clause.
    /// \return true if at least one linear variable is found that should be
    /// initialized with the value of the original variable, false otherwise.
    bool EmitOMPLinearClauseInit(const OMPLoopDirective &D);
  
    typedef const llvm::function_ref<void(CodeGenFunction & /*CGF*/,
                                          llvm::Function * /*OutlinedFn*/,
                                          const OMPTaskDataTy & /*Data*/)>
        TaskGenTy;
    void EmitOMPTaskBasedDirective(const OMPExecutableDirective &S,
                                   const OpenMPDirectiveKind CapturedRegion,
                                   const RegionCodeGenTy &BodyGen,
                                   const TaskGenTy &TaskGen, OMPTaskDataTy &Data);
    struct OMPTargetDataInfo {
      Address BasePointersArray = Address::invalid();
      Address PointersArray = Address::invalid();
      Address SizesArray = Address::invalid();
      Address MappersArray = Address::invalid();
      unsigned NumberOfTargetItems = 0;
      explicit OMPTargetDataInfo() = default;
      OMPTargetDataInfo(Address BasePointersArray, Address PointersArray,
                        Address SizesArray, Address MappersArray,
                        unsigned NumberOfTargetItems)
          : BasePointersArray(BasePointersArray), PointersArray(PointersArray),
            SizesArray(SizesArray), MappersArray(MappersArray),
            NumberOfTargetItems(NumberOfTargetItems) {}
    };
    void EmitOMPTargetTaskBasedDirective(const OMPExecutableDirective &S,
                                         const RegionCodeGenTy &BodyGen,
                                         OMPTargetDataInfo &InputInfo);
  
    void EmitOMPParallelDirective(const OMPParallelDirective &S);
    void EmitOMPSimdDirective(const OMPSimdDirective &S);
    void EmitOMPTileDirective(const OMPTileDirective &S);
    void EmitOMPUnrollDirective(const OMPUnrollDirective &S);
    void EmitOMPForDirective(const OMPForDirective &S);
    void EmitOMPForSimdDirective(const OMPForSimdDirective &S);
    void EmitOMPSectionsDirective(const OMPSectionsDirective &S);
    void EmitOMPSectionDirective(const OMPSectionDirective &S);
    void EmitOMPSingleDirective(const OMPSingleDirective &S);
    void EmitOMPMasterDirective(const OMPMasterDirective &S);
    void EmitOMPMaskedDirective(const OMPMaskedDirective &S);
    void EmitOMPCriticalDirective(const OMPCriticalDirective &S);
    void EmitOMPParallelForDirective(const OMPParallelForDirective &S);
    void EmitOMPParallelForSimdDirective(const OMPParallelForSimdDirective &S);
    void EmitOMPParallelSectionsDirective(const OMPParallelSectionsDirective &S);
    void EmitOMPParallelMasterDirective(const OMPParallelMasterDirective &S);
    void EmitOMPTaskDirective(const OMPTaskDirective &S);
    void EmitOMPTaskyieldDirective(const OMPTaskyieldDirective &S);
    void EmitOMPBarrierDirective(const OMPBarrierDirective &S);
    void EmitOMPTaskwaitDirective(const OMPTaskwaitDirective &S);
    void EmitOMPTaskgroupDirective(const OMPTaskgroupDirective &S);
    void EmitOMPFlushDirective(const OMPFlushDirective &S);
    void EmitOMPDepobjDirective(const OMPDepobjDirective &S);
    void EmitOMPScanDirective(const OMPScanDirective &S);
    void EmitOMPOrderedDirective(const OMPOrderedDirective &S);
    void EmitOMPAtomicDirective(const OMPAtomicDirective &S);
    void EmitOMPTargetDirective(const OMPTargetDirective &S);
    void EmitOMPTargetDataDirective(const OMPTargetDataDirective &S);
    void EmitOMPTargetEnterDataDirective(const OMPTargetEnterDataDirective &S);
    void EmitOMPTargetExitDataDirective(const OMPTargetExitDataDirective &S);
    void EmitOMPTargetUpdateDirective(const OMPTargetUpdateDirective &S);
    void EmitOMPTargetParallelDirective(const OMPTargetParallelDirective &S);
    void
    EmitOMPTargetParallelForDirective(const OMPTargetParallelForDirective &S);
    void EmitOMPTeamsDirective(const OMPTeamsDirective &S);
    void
    EmitOMPCancellationPointDirective(const OMPCancellationPointDirective &S);
    void EmitOMPCancelDirective(const OMPCancelDirective &S);
    void EmitOMPTaskLoopBasedDirective(const OMPLoopDirective &S);
    void EmitOMPTaskLoopDirective(const OMPTaskLoopDirective &S);
    void EmitOMPTaskLoopSimdDirective(const OMPTaskLoopSimdDirective &S);
    void EmitOMPMasterTaskLoopDirective(const OMPMasterTaskLoopDirective &S);
    void
    EmitOMPMasterTaskLoopSimdDirective(const OMPMasterTaskLoopSimdDirective &S);
    void EmitOMPParallelMasterTaskLoopDirective(
        const OMPParallelMasterTaskLoopDirective &S);
    void EmitOMPParallelMasterTaskLoopSimdDirective(
        const OMPParallelMasterTaskLoopSimdDirective &S);
    void EmitOMPDistributeDirective(const OMPDistributeDirective &S);
    void EmitOMPDistributeParallelForDirective(
        const OMPDistributeParallelForDirective &S);
    void EmitOMPDistributeParallelForSimdDirective(
        const OMPDistributeParallelForSimdDirective &S);
    void EmitOMPDistributeSimdDirective(const OMPDistributeSimdDirective &S);
    void EmitOMPTargetParallelForSimdDirective(
        const OMPTargetParallelForSimdDirective &S);
    void EmitOMPTargetSimdDirective(const OMPTargetSimdDirective &S);
    void EmitOMPTeamsDistributeDirective(const OMPTeamsDistributeDirective &S);
    void
    EmitOMPTeamsDistributeSimdDirective(const OMPTeamsDistributeSimdDirective &S);
    void EmitOMPTeamsDistributeParallelForSimdDirective(
        const OMPTeamsDistributeParallelForSimdDirective &S);
    void EmitOMPTeamsDistributeParallelForDirective(
        const OMPTeamsDistributeParallelForDirective &S);
    void EmitOMPTargetTeamsDirective(const OMPTargetTeamsDirective &S);
    void EmitOMPTargetTeamsDistributeDirective(
        const OMPTargetTeamsDistributeDirective &S);
    void EmitOMPTargetTeamsDistributeParallelForDirective(
        const OMPTargetTeamsDistributeParallelForDirective &S);
    void EmitOMPTargetTeamsDistributeParallelForSimdDirective(
        const OMPTargetTeamsDistributeParallelForSimdDirective &S);
    void EmitOMPTargetTeamsDistributeSimdDirective(
        const OMPTargetTeamsDistributeSimdDirective &S);
  
    /// Emit device code for the target directive.
    static void EmitOMPTargetDeviceFunction(CodeGenModule &CGM,
                                            StringRef ParentName,
                                            const OMPTargetDirective &S);
    static void
    EmitOMPTargetParallelDeviceFunction(CodeGenModule &CGM, StringRef ParentName,
                                        const OMPTargetParallelDirective &S);
    /// Emit device code for the target parallel for directive.
    static void EmitOMPTargetParallelForDeviceFunction(
        CodeGenModule &CGM, StringRef ParentName,
        const OMPTargetParallelForDirective &S);
    /// Emit device code for the target parallel for simd directive.
    static void EmitOMPTargetParallelForSimdDeviceFunction(
        CodeGenModule &CGM, StringRef ParentName,
        const OMPTargetParallelForSimdDirective &S);
    /// Emit device code for the target teams directive.
    static void
    EmitOMPTargetTeamsDeviceFunction(CodeGenModule &CGM, StringRef ParentName,
                                     const OMPTargetTeamsDirective &S);
    /// Emit device code for the target teams distribute directive.
    static void EmitOMPTargetTeamsDistributeDeviceFunction(
        CodeGenModule &CGM, StringRef ParentName,
        const OMPTargetTeamsDistributeDirective &S);
    /// Emit device code for the target teams distribute simd directive.
    static void EmitOMPTargetTeamsDistributeSimdDeviceFunction(
        CodeGenModule &CGM, StringRef ParentName,
        const OMPTargetTeamsDistributeSimdDirective &S);
    /// Emit device code for the target simd directive.
    static void EmitOMPTargetSimdDeviceFunction(CodeGenModule &CGM,
                                                StringRef ParentName,
                                                const OMPTargetSimdDirective &S);
    /// Emit device code for the target teams distribute parallel for simd
    /// directive.
    static void EmitOMPTargetTeamsDistributeParallelForSimdDeviceFunction(
        CodeGenModule &CGM, StringRef ParentName,
        const OMPTargetTeamsDistributeParallelForSimdDirective &S);
  
    static void EmitOMPTargetTeamsDistributeParallelForDeviceFunction(
        CodeGenModule &CGM, StringRef ParentName,
        const OMPTargetTeamsDistributeParallelForDirective &S);
  
    /// Emit the Stmt \p S and return its topmost canonical loop, if any.
    /// TODO: The \p Depth paramter is not yet implemented and must be 1. In the
    /// future it is meant to be the number of loops expected in the loop nests
    /// (usually specified by the "collapse" clause) that are collapsed to a
    /// single loop by this function.
    llvm::CanonicalLoopInfo *EmitOMPCollapsedCanonicalLoopNest(const Stmt *S,
                                                               int Depth);
  
    /// Emit an OMPCanonicalLoop using the OpenMPIRBuilder.
    void EmitOMPCanonicalLoop(const OMPCanonicalLoop *S);
  
    /// Emit inner loop of the worksharing/simd construct.
    ///
    /// \param S Directive, for which the inner loop must be emitted.
    /// \param RequiresCleanup true, if directive has some associated private
    /// variables.
    /// \param LoopCond Bollean condition for loop continuation.
    /// \param IncExpr Increment expression for loop control variable.
    /// \param BodyGen Generator for the inner body of the inner loop.
    /// \param PostIncGen Genrator for post-increment code (required for ordered
    /// loop directvies).
    void EmitOMPInnerLoop(
        const OMPExecutableDirective &S, bool RequiresCleanup,
        const Expr *LoopCond, const Expr *IncExpr,
        const llvm::function_ref<void(CodeGenFunction &)> BodyGen,
        const llvm::function_ref<void(CodeGenFunction &)> PostIncGen);
  
    JumpDest getOMPCancelDestination(OpenMPDirectiveKind Kind);
    /// Emit initial code for loop counters of loop-based directives.
    void EmitOMPPrivateLoopCounters(const OMPLoopDirective &S,
                                    OMPPrivateScope &LoopScope);
  
    /// Helper for the OpenMP loop directives.
    void EmitOMPLoopBody(const OMPLoopDirective &D, JumpDest LoopExit);
  
    /// Emit code for the worksharing loop-based directive.
    /// \return true, if this construct has any lastprivate clause, false -
    /// otherwise.
    bool EmitOMPWorksharingLoop(const OMPLoopDirective &S, Expr *EUB,
                                const CodeGenLoopBoundsTy &CodeGenLoopBounds,
                                const CodeGenDispatchBoundsTy &CGDispatchBounds);
  
    /// Emit code for the distribute loop-based directive.
    void EmitOMPDistributeLoop(const OMPLoopDirective &S,
                               const CodeGenLoopTy &CodeGenLoop, Expr *IncExpr);
  
    /// Helpers for the OpenMP loop directives.
    void EmitOMPSimdInit(const OMPLoopDirective &D);
    void EmitOMPSimdFinal(
        const OMPLoopDirective &D,
        const llvm::function_ref<llvm::Value *(CodeGenFunction &)> CondGen);
  
    /// Emits the lvalue for the expression with possibly captured variable.
    LValue EmitOMPSharedLValue(const Expr *E);
  
  private:
    /// Helpers for blocks.
    llvm::Value *EmitBlockLiteral(const CGBlockInfo &Info);
  
    /// struct with the values to be passed to the OpenMP loop-related functions
    struct OMPLoopArguments {
      /// loop lower bound
      Address LB = Address::invalid();
      /// loop upper bound
      Address UB = Address::invalid();
      /// loop stride
      Address ST = Address::invalid();
      /// isLastIteration argument for runtime functions
      Address IL = Address::invalid();
      /// Chunk value generated by sema
      llvm::Value *Chunk = nullptr;
      /// EnsureUpperBound
      Expr *EUB = nullptr;
      /// IncrementExpression
      Expr *IncExpr = nullptr;
      /// Loop initialization
      Expr *Init = nullptr;
      /// Loop exit condition
      Expr *Cond = nullptr;
      /// Update of LB after a whole chunk has been executed
      Expr *NextLB = nullptr;
      /// Update of UB after a whole chunk has been executed
      Expr *NextUB = nullptr;
      OMPLoopArguments() = default;
      OMPLoopArguments(Address LB, Address UB, Address ST, Address IL,
                       llvm::Value *Chunk = nullptr, Expr *EUB = nullptr,
                       Expr *IncExpr = nullptr, Expr *Init = nullptr,
                       Expr *Cond = nullptr, Expr *NextLB = nullptr,
                       Expr *NextUB = nullptr)
          : LB(LB), UB(UB), ST(ST), IL(IL), Chunk(Chunk), EUB(EUB),
            IncExpr(IncExpr), Init(Init), Cond(Cond), NextLB(NextLB),
            NextUB(NextUB) {}
    };
    void EmitOMPOuterLoop(bool DynamicOrOrdered, bool IsMonotonic,
                          const OMPLoopDirective &S, OMPPrivateScope &LoopScope,
                          const OMPLoopArguments &LoopArgs,
                          const CodeGenLoopTy &CodeGenLoop,
                          const CodeGenOrderedTy &CodeGenOrdered);
    void EmitOMPForOuterLoop(const OpenMPScheduleTy &ScheduleKind,
                             bool IsMonotonic, const OMPLoopDirective &S,
                             OMPPrivateScope &LoopScope, bool Ordered,
                             const OMPLoopArguments &LoopArgs,
                             const CodeGenDispatchBoundsTy &CGDispatchBounds);
    void EmitOMPDistributeOuterLoop(OpenMPDistScheduleClauseKind ScheduleKind,
                                    const OMPLoopDirective &S,
                                    OMPPrivateScope &LoopScope,
                                    const OMPLoopArguments &LoopArgs,
                                    const CodeGenLoopTy &CodeGenLoopContent);
    /// Emit code for sections directive.
    void EmitSections(const OMPExecutableDirective &S);
  
  public:
  
    //===--------------------------------------------------------------------===//
    //                         LValue Expression Emission
    //===--------------------------------------------------------------------===//
  
    /// Create a check that a scalar RValue is non-null.
    llvm::Value *EmitNonNullRValueCheck(RValue RV, QualType T);
  
    /// GetUndefRValue - Get an appropriate 'undef' rvalue for the given type.
    RValue GetUndefRValue(QualType Ty);
  
    /// EmitUnsupportedRValue - Emit a dummy r-value using the type of E
    /// and issue an ErrorUnsupported style diagnostic (using the
    /// provided Name).
    RValue EmitUnsupportedRValue(const Expr *E,
                                 const char *Name);
  
    /// EmitUnsupportedLValue - Emit a dummy l-value using the type of E and issue
    /// an ErrorUnsupported style diagnostic (using the provided Name).
    LValue EmitUnsupportedLValue(const Expr *E,
                                 const char *Name);
  
    /// EmitLValue - Emit code to compute a designator that specifies the location
    /// of the expression.
    ///
    /// This can return one of two things: a simple address or a bitfield
    /// reference.  In either case, the LLVM Value* in the LValue structure is
    /// guaranteed to be an LLVM pointer type.
    ///
    /// If this returns a bitfield reference, nothing about the pointee type of
    /// the LLVM value is known: For example, it may not be a pointer to an
    /// integer.
    ///
    /// If this returns a normal address, and if the lvalue's C type is fixed
    /// size, this method guarantees that the returned pointer type will point to
    /// an LLVM type of the same size of the lvalue's type.  If the lvalue has a
    /// variable length type, this is not possible.
    ///
    LValue EmitLValue(const Expr *E);
  
    /// Same as EmitLValue but additionally we generate checking code to
    /// guard against undefined behavior.  This is only suitable when we know
    /// that the address will be used to access the object.
    LValue EmitCheckedLValue(const Expr *E, TypeCheckKind TCK);
  
    RValue convertTempToRValue(Address addr, QualType type,
                               SourceLocation Loc);
  
    void EmitAtomicInit(Expr *E, LValue lvalue);
  
    bool LValueIsSuitableForInlineAtomic(LValue Src);
  
    RValue EmitAtomicLoad(LValue LV, SourceLocation SL,
                          AggValueSlot Slot = AggValueSlot::ignored());
  
    RValue EmitAtomicLoad(LValue lvalue, SourceLocation loc,
                          llvm::AtomicOrdering AO, bool IsVolatile = false,
                          AggValueSlot slot = AggValueSlot::ignored());
  
    void EmitAtomicStore(RValue rvalue, LValue lvalue, bool isInit);
  
    void EmitAtomicStore(RValue rvalue, LValue lvalue, llvm::AtomicOrdering AO,
                         bool IsVolatile, bool isInit);
  
    std::pair<RValue, llvm::Value *> EmitAtomicCompareExchange(
        LValue Obj, RValue Expected, RValue Desired, SourceLocation Loc,
        llvm::AtomicOrdering Success =
            llvm::AtomicOrdering::SequentiallyConsistent,
        llvm::AtomicOrdering Failure =
            llvm::AtomicOrdering::SequentiallyConsistent,
        bool IsWeak = false, AggValueSlot Slot = AggValueSlot::ignored());
  
    void EmitAtomicUpdate(LValue LVal, llvm::AtomicOrdering AO,
                          const llvm::function_ref<RValue(RValue)> &UpdateOp,
                          bool IsVolatile);
  
    /// EmitToMemory - Change a scalar value from its value
    /// representation to its in-memory representation.
    llvm::Value *EmitToMemory(llvm::Value *Value, QualType Ty);
  
    /// EmitFromMemory - Change a scalar value from its memory
    /// representation to its value representation.
    llvm::Value *EmitFromMemory(llvm::Value *Value, QualType Ty);
  
    /// Check if the scalar \p Value is within the valid range for the given
    /// type \p Ty.
    ///
    /// Returns true if a check is needed (even if the range is unknown).
    bool EmitScalarRangeCheck(llvm::Value *Value, QualType Ty,
                              SourceLocation Loc);
  
    /// EmitLoadOfScalar - Load a scalar value from an address, taking
    /// care to appropriately convert from the memory representation to
    /// the LLVM value representation.
    llvm::Value *EmitLoadOfScalar(Address Addr, bool Volatile, QualType Ty,
                                  SourceLocation Loc,
                                  AlignmentSource Source = AlignmentSource::Type,
                                  bool isNontemporal = false) {
      return EmitLoadOfScalar(Addr, Volatile, Ty, Loc, LValueBaseInfo(Source),
                              CGM.getTBAAAccessInfo(Ty), isNontemporal);
    }
  
    llvm::Value *EmitLoadOfScalar(Address Addr, bool Volatile, QualType Ty,
                                  SourceLocation Loc, LValueBaseInfo BaseInfo,
                                  TBAAAccessInfo TBAAInfo,
                                  bool isNontemporal = false);
  
    /// EmitLoadOfScalar - Load a scalar value from an address, taking
    /// care to appropriately convert from the memory representation to
    /// the LLVM value representation.  The l-value must be a simple
    /// l-value.
    llvm::Value *EmitLoadOfScalar(LValue lvalue, SourceLocation Loc);
  
    /// EmitStoreOfScalar - Store a scalar value to an address, taking
    /// care to appropriately convert from the memory representation to
    /// the LLVM value representation.
    void EmitStoreOfScalar(llvm::Value *Value, Address Addr,
                           bool Volatile, QualType Ty,
                           AlignmentSource Source = AlignmentSource::Type,
                           bool isInit = false, bool isNontemporal = false) {
      EmitStoreOfScalar(Value, Addr, Volatile, Ty, LValueBaseInfo(Source),
                        CGM.getTBAAAccessInfo(Ty), isInit, isNontemporal);
    }
  
    void EmitStoreOfScalar(llvm::Value *Value, Address Addr,
                           bool Volatile, QualType Ty,
                           LValueBaseInfo BaseInfo, TBAAAccessInfo TBAAInfo,
                           bool isInit = false, bool isNontemporal = false);
  
    /// EmitStoreOfScalar - Store a scalar value to an address, taking
    /// care to appropriately convert from the memory representation to
    /// the LLVM value representation.  The l-value must be a simple
    /// l-value.  The isInit flag indicates whether this is an initialization.
    /// If so, atomic qualifiers are ignored and the store is always non-atomic.
    void EmitStoreOfScalar(llvm::Value *value, LValue lvalue, bool isInit=false);
  
    /// EmitLoadOfLValue - Given an expression that represents a value lvalue,
    /// this method emits the address of the lvalue, then loads the result as an
    /// rvalue, returning the rvalue.
    RValue EmitLoadOfLValue(LValue V, SourceLocation Loc);
    RValue EmitLoadOfExtVectorElementLValue(LValue V);
    RValue EmitLoadOfBitfieldLValue(LValue LV, SourceLocation Loc);
    RValue EmitLoadOfGlobalRegLValue(LValue LV);
  
    /// EmitStoreThroughLValue - Store the specified rvalue into the specified
    /// lvalue, where both are guaranteed to the have the same type, and that type
    /// is 'Ty'.
    void EmitStoreThroughLValue(RValue Src, LValue Dst, bool isInit = false);
    void EmitStoreThroughExtVectorComponentLValue(RValue Src, LValue Dst);
    void EmitStoreThroughGlobalRegLValue(RValue Src, LValue Dst);
  
    /// EmitStoreThroughBitfieldLValue - Store Src into Dst with same constraints
    /// as EmitStoreThroughLValue.
    ///
    /// \param Result [out] - If non-null, this will be set to a Value* for the
    /// bit-field contents after the store, appropriate for use as the result of
    /// an assignment to the bit-field.
    void EmitStoreThroughBitfieldLValue(RValue Src, LValue Dst,
                                        llvm::Value **Result=nullptr);
  
    /// Emit an l-value for an assignment (simple or compound) of complex type.
    LValue EmitComplexAssignmentLValue(const BinaryOperator *E);
    LValue EmitComplexCompoundAssignmentLValue(const CompoundAssignOperator *E);
    LValue EmitScalarCompoundAssignWithComplex(const CompoundAssignOperator *E,
                                               llvm::Value *&Result);
  
    // Note: only available for agg return types
    LValue EmitBinaryOperatorLValue(const BinaryOperator *E);
    LValue EmitCompoundAssignmentLValue(const CompoundAssignOperator *E);
    // Note: only available for agg return types
    LValue EmitCallExprLValue(const CallExpr *E);
    // Note: only available for agg return types
    LValue EmitVAArgExprLValue(const VAArgExpr *E);
    LValue EmitDeclRefLValue(const DeclRefExpr *E);
    LValue EmitStringLiteralLValue(const StringLiteral *E);
    LValue EmitObjCEncodeExprLValue(const ObjCEncodeExpr *E);
    LValue EmitPredefinedLValue(const PredefinedExpr *E);
    LValue EmitUnaryOpLValue(const UnaryOperator *E);
    LValue EmitArraySubscriptExpr(const ArraySubscriptExpr *E,
                                  bool Accessed = false);
    LValue EmitMatrixSubscriptExpr(const MatrixSubscriptExpr *E);
    LValue EmitOMPArraySectionExpr(const OMPArraySectionExpr *E,
                                   bool IsLowerBound = true);
    LValue EmitExtVectorElementExpr(const ExtVectorElementExpr *E);
    LValue EmitMemberExpr(const MemberExpr *E);
    LValue EmitObjCIsaExpr(const ObjCIsaExpr *E);
    LValue EmitCompoundLiteralLValue(const CompoundLiteralExpr *E);
    LValue EmitInitListLValue(const InitListExpr *E);
    LValue EmitConditionalOperatorLValue(const AbstractConditionalOperator *E);
    LValue EmitCastLValue(const CastExpr *E);
    LValue EmitMaterializeTemporaryExpr(const MaterializeTemporaryExpr *E);
    LValue EmitOpaqueValueLValue(const OpaqueValueExpr *e);
  
    Address EmitExtVectorElementLValue(LValue V);
  
    RValue EmitRValueForField(LValue LV, const FieldDecl *FD, SourceLocation Loc);
  
    Address EmitArrayToPointerDecay(const Expr *Array,
                                    LValueBaseInfo *BaseInfo = nullptr,
                                    TBAAAccessInfo *TBAAInfo = nullptr);
  
    class ConstantEmission {
      llvm::PointerIntPair<llvm::Constant*, 1, bool> ValueAndIsReference;
      ConstantEmission(llvm::Constant *C, bool isReference)
        : ValueAndIsReference(C, isReference) {}
    public:
      ConstantEmission() {}
      static ConstantEmission forReference(llvm::Constant *C) {
        return ConstantEmission(C, true);
      }
      static ConstantEmission forValue(llvm::Constant *C) {
        return ConstantEmission(C, false);
      }
  
      explicit operator bool() const {
        return ValueAndIsReference.getOpaqueValue() != nullptr;
      }
  
      bool isReference() const { return ValueAndIsReference.getInt(); }
      LValue getReferenceLValue(CodeGenFunction &CGF, Expr *refExpr) const {
        assert(isReference());
        return CGF.MakeNaturalAlignAddrLValue(ValueAndIsReference.getPointer(),
                                              refExpr->getType());
      }
  
      llvm::Constant *getValue() const {
        assert(!isReference());
        return ValueAndIsReference.getPointer();
      }
    };
  
    ConstantEmission tryEmitAsConstant(DeclRefExpr *refExpr);
    ConstantEmission tryEmitAsConstant(const MemberExpr *ME);
    llvm::Value *emitScalarConstant(const ConstantEmission &Constant, Expr *E);
  
    RValue EmitPseudoObjectRValue(const PseudoObjectExpr *e,
                                  AggValueSlot slot = AggValueSlot::ignored());
    LValue EmitPseudoObjectLValue(const PseudoObjectExpr *e);
  
    llvm::Value *EmitIvarOffset(const ObjCInterfaceDecl *Interface,
                                const ObjCIvarDecl *Ivar);
    LValue EmitLValueForField(LValue Base, const FieldDecl* Field);
    LValue EmitLValueForLambdaField(const FieldDecl *Field);
  
    /// EmitLValueForFieldInitialization - Like EmitLValueForField, except that
    /// if the Field is a reference, this will return the address of the reference
    /// and not the address of the value stored in the reference.
    LValue EmitLValueForFieldInitialization(LValue Base,
                                            const FieldDecl* Field);
  
    LValue EmitLValueForIvar(QualType ObjectTy,
                             llvm::Value* Base, const ObjCIvarDecl *Ivar,
                             unsigned CVRQualifiers);
  
    LValue EmitCXXConstructLValue(const CXXConstructExpr *E);
    LValue EmitCXXBindTemporaryLValue(const CXXBindTemporaryExpr *E);
    LValue EmitCXXTypeidLValue(const CXXTypeidExpr *E);
    LValue EmitCXXUuidofLValue(const CXXUuidofExpr *E);
  
    LValue EmitObjCMessageExprLValue(const ObjCMessageExpr *E);
    LValue EmitObjCIvarRefLValue(const ObjCIvarRefExpr *E);
    LValue EmitStmtExprLValue(const StmtExpr *E);
    LValue EmitPointerToDataMemberBinaryExpr(const BinaryOperator *E);
    LValue EmitObjCSelectorLValue(const ObjCSelectorExpr *E);
    void   EmitDeclRefExprDbgValue(const DeclRefExpr *E, const APValue &Init);
  
    //===--------------------------------------------------------------------===//
    //                         Scalar Expression Emission
    //===--------------------------------------------------------------------===//
  
    /// EmitCall - Generate a call of the given function, expecting the given
    /// result type, and using the given argument list which specifies both the
    /// LLVM arguments and the types they were derived from.
    RValue EmitCall(const CGFunctionInfo &CallInfo, const CGCallee &Callee,
                    ReturnValueSlot ReturnValue, const CallArgList &Args,
                    llvm::CallBase **callOrInvoke, bool IsMustTail,
                    SourceLocation Loc,
                    bool IsVirtualFunctionPointerThunk = false);
    RValue EmitCall(const CGFunctionInfo &CallInfo, const CGCallee &Callee,
                    ReturnValueSlot ReturnValue, const CallArgList &Args,
                    llvm::CallBase **callOrInvoke = nullptr,
                    bool IsMustTail = false) {
      return EmitCall(CallInfo, Callee, ReturnValue, Args, callOrInvoke,
                      IsMustTail, SourceLocation());
    }
    RValue EmitCall(QualType FnType, const CGCallee &Callee, const CallExpr *E,
                    ReturnValueSlot ReturnValue, llvm::Value *Chain = nullptr);
    RValue EmitCallExpr(const CallExpr *E,
                        ReturnValueSlot ReturnValue = ReturnValueSlot());
    RValue EmitSimpleCallExpr(const CallExpr *E, ReturnValueSlot ReturnValue);
    CGCallee EmitCallee(const Expr *E);
  
    void checkTargetFeatures(const CallExpr *E, const FunctionDecl *TargetDecl);
    void checkTargetFeatures(SourceLocation Loc, const FunctionDecl *TargetDecl);
  
    llvm::CallInst *EmitRuntimeCall(llvm::FunctionCallee callee,
                                    const Twine &name = "");
    llvm::CallInst *EmitRuntimeCall(llvm::FunctionCallee callee,
                                    ArrayRef<llvm::Value *> args,
                                    const Twine &name = "");
    llvm::CallInst *EmitNounwindRuntimeCall(llvm::FunctionCallee callee,
                                            const Twine &name = "");
    llvm::CallInst *EmitNounwindRuntimeCall(llvm::FunctionCallee callee,
                                            ArrayRef<llvm::Value *> args,
                                            const Twine &name = "");
  
    SmallVector<llvm::OperandBundleDef, 1>
    getBundlesForFunclet(llvm::Value *Callee);
  
    llvm::CallBase *EmitCallOrInvoke(llvm::FunctionCallee Callee,
                                     ArrayRef<llvm::Value *> Args,
                                     const Twine &Name = "");
    llvm::CallBase *EmitRuntimeCallOrInvoke(llvm::FunctionCallee callee,
                                            ArrayRef<llvm::Value *> args,
                                            const Twine &name = "");
    llvm::CallBase *EmitRuntimeCallOrInvoke(llvm::FunctionCallee callee,
                                            const Twine &name = "");
    void EmitNoreturnRuntimeCallOrInvoke(llvm::FunctionCallee callee,
                                         ArrayRef<llvm::Value *> args);
  
    CGCallee BuildAppleKextVirtualCall(const CXXMethodDecl *MD,
                                       NestedNameSpecifier *Qual,
                                       llvm::Type *Ty);
  
    CGCallee BuildAppleKextVirtualDestructorCall(const CXXDestructorDecl *DD,
                                                 CXXDtorType Type,
                                                 const CXXRecordDecl *RD);
  
    /// Create the discriminator from the storage address and the entity hash.
    llvm::Value *EmitPointerAuthBlendDiscriminator(llvm::Value *storageAddress,
                                                   llvm::Value *discriminator);
  
    CGPointerAuthInfo EmitPointerAuthInfo(const PointerAuthSchema &schema,
                                          llvm::Value *storageAddress,
                                          GlobalDecl calleeDecl,
                                          QualType calleeType);
    llvm::Value *EmitPointerAuthSign(const CGPointerAuthInfo &info,
                                     llvm::Value *pointer);
    llvm::Value *EmitPointerAuthAuth(const CGPointerAuthInfo &info,
                                     llvm::Value *pointer);
    llvm::Value *EmitPointerAuthResign(llvm::Value *pointer,
                                       QualType pointerType,
                                       const CGPointerAuthInfo &curAuthInfo,
                                       const CGPointerAuthInfo &newAuthInfo,
                                       bool isKnownNonNull);
    llvm::Value *EmitPointerAuthResignCall(llvm::Value *pointer,
                                           const CGPointerAuthInfo &curInfo,
                                           const CGPointerAuthInfo &newInfo);
    void EmitPointerAuthOperandBundle(const CGPointerAuthInfo &info,
                            SmallVectorImpl<llvm::OperandBundleDef> &bundles);
  
    CGPointerAuthInfo EmitPointerAuthInfo(PointerAuthQualifier qualifier,
                                          Address storageAddress);
    llvm::Value *EmitPointerAuthQualify(PointerAuthQualifier qualifier,
                                        llvm::Value *pointer,
                                        QualType valueType,
                                        Address storageAddress,
                                        bool isKnownNonNull);
    llvm::Value *EmitPointerAuthQualify(PointerAuthQualifier qualifier,
                                        const Expr *pointerExpr,
                                        Address storageAddress);
    llvm::Value *EmitPointerAuthUnqualify(PointerAuthQualifier qualifier,
                                          llvm::Value *pointer,
                                          QualType pointerType,
                                          Address storageAddress,
                                          bool isKnownNonNull);
    void EmitPointerAuthCopy(PointerAuthQualifier qualifier, QualType type,
                             Address destField, Address srcField);
  
    std::pair<llvm::Value *, CGPointerAuthInfo>
    EmitOrigPointerRValue(const Expr *E);
    bool isPointerKnownNonNull(const Expr *E);
  
    // Return the copy constructor name with the prefix "__copy_constructor_"
    // removed.
    static std::string getNonTrivialCopyConstructorStr(QualType QT,
                                                       CharUnits Alignment,
                                                       bool IsVolatile,
                                                       ASTContext &Ctx);
  
    // Return the destructor name with the prefix "__destructor_" removed.
    static std::string getNonTrivialDestructorStr(QualType QT,
                                                  CharUnits Alignment,
                                                  bool IsVolatile,
                                                  ASTContext &Ctx);
  
    // These functions emit calls to the special functions of non-trivial C
    // structs.
    void defaultInitNonTrivialCStructVar(LValue Dst);
    void callCStructDefaultConstructor(LValue Dst);
    void callCStructDestructor(LValue Dst);
    void callCStructCopyConstructor(LValue Dst, LValue Src);
    void callCStructMoveConstructor(LValue Dst, LValue Src);
    void callCStructCopyAssignmentOperator(LValue Dst, LValue Src);
    void callCStructMoveAssignmentOperator(LValue Dst, LValue Src);
  
    RValue
    EmitCXXMemberOrOperatorCall(const CXXMethodDecl *Method,
                                const CGCallee &Callee,
                                ReturnValueSlot ReturnValue, llvm::Value *This,
                                llvm::Value *ImplicitParam,
                                QualType ImplicitParamTy, const CallExpr *E,
                                CallArgList *RtlArgs);
    RValue EmitCXXDestructorCall(GlobalDecl Dtor, const CGCallee &Callee,
                                 llvm::Value *This, QualType ThisTy,
                                 llvm::Value *ImplicitParam,
                                 QualType ImplicitParamTy, const CallExpr *E);
    RValue EmitCXXMemberCallExpr(const CXXMemberCallExpr *E,
                                 ReturnValueSlot ReturnValue);
    RValue EmitCXXMemberOrOperatorMemberCallExpr(const CallExpr *CE,
                                                 const CXXMethodDecl *MD,
                                                 ReturnValueSlot ReturnValue,
                                                 bool HasQualifier,
                                                 NestedNameSpecifier *Qualifier,
                                                 bool IsArrow, const Expr *Base);
    // Compute the object pointer.
    Address EmitCXXMemberDataPointerAddress(const Expr *E, Address base,
                                            llvm::Value *memberPtr,
                                            const MemberPointerType *memberPtrType,
                                            LValueBaseInfo *BaseInfo = nullptr,
                                            TBAAAccessInfo *TBAAInfo = nullptr);
    RValue EmitCXXMemberPointerCallExpr(const CXXMemberCallExpr *E,
                                        ReturnValueSlot ReturnValue);
  
    RValue EmitCXXOperatorMemberCallExpr(const CXXOperatorCallExpr *E,
                                         const CXXMethodDecl *MD,
                                         ReturnValueSlot ReturnValue);
    RValue EmitCXXPseudoDestructorExpr(const CXXPseudoDestructorExpr *E);
  
    RValue EmitCUDAKernelCallExpr(const CUDAKernelCallExpr *E,
                                  ReturnValueSlot ReturnValue);
  
    RValue EmitNVPTXDevicePrintfCallExpr(const CallExpr *E,
                                         ReturnValueSlot ReturnValue);
    RValue EmitAMDGPUDevicePrintfCallExpr(const CallExpr *E,
                                          ReturnValueSlot ReturnValue);
  
    RValue EmitBuiltinExpr(const GlobalDecl GD, unsigned BuiltinID,
                           const CallExpr *E, ReturnValueSlot ReturnValue);
  
    RValue emitRotate(const CallExpr *E, bool IsRotateRight);
  
    /// Emit IR for __builtin_os_log_format.
    RValue emitBuiltinOSLogFormat(const CallExpr &E);
  
    /// Emit IR for __builtin_is_aligned.
    RValue EmitBuiltinIsAligned(const CallExpr *E);
    /// Emit IR for __builtin_align_up/__builtin_align_down.
    RValue EmitBuiltinAlignTo(const CallExpr *E, bool AlignUp);
  
    llvm::Function *generateBuiltinOSLogHelperFunction(
        const analyze_os_log::OSLogBufferLayout &Layout,
        CharUnits BufferAlignment);
  
    RValue EmitBlockCallExpr(const CallExpr *E, ReturnValueSlot ReturnValue);
  
    /// EmitTargetBuiltinExpr - Emit the given builtin call. Returns 0 if the call
    /// is unhandled by the current target.
    llvm::Value *EmitTargetBuiltinExpr(unsigned BuiltinID, const CallExpr *E,
                                       ReturnValueSlot ReturnValue);
  
    llvm::Value *EmitAArch64CompareBuiltinExpr(llvm::Value *Op, llvm::Type *Ty,
                                               const llvm::CmpInst::Predicate Fp,
                                               const llvm::CmpInst::Predicate Ip,
                                               const llvm::Twine &Name = "");
    llvm::Value *EmitARMBuiltinExpr(unsigned BuiltinID, const CallExpr *E,
                                    ReturnValueSlot ReturnValue,
                                    llvm::Triple::ArchType Arch);
    llvm::Value *EmitARMMVEBuiltinExpr(unsigned BuiltinID, const CallExpr *E,
                                       ReturnValueSlot ReturnValue,
                                       llvm::Triple::ArchType Arch);
    llvm::Value *EmitARMCDEBuiltinExpr(unsigned BuiltinID, const CallExpr *E,
                                       ReturnValueSlot ReturnValue,
                                       llvm::Triple::ArchType Arch);
    llvm::Value *EmitCMSEClearRecord(llvm::Value *V, llvm::IntegerType *ITy,
                                     QualType RTy);
    llvm::Value *EmitCMSEClearRecord(llvm::Value *V, llvm::ArrayType *ATy,
                                     QualType RTy);
  
    llvm::Value *EmitCommonNeonBuiltinExpr(unsigned BuiltinID,
                                           unsigned LLVMIntrinsic,
                                           unsigned AltLLVMIntrinsic,
                                           const char *NameHint,
                                           unsigned Modifier,
                                           const CallExpr *E,
                                           SmallVectorImpl<llvm::Value *> &Ops,
                                           Address PtrOp0, Address PtrOp1,
                                           llvm::Triple::ArchType Arch);
  
    llvm::Function *LookupNeonLLVMIntrinsic(unsigned IntrinsicID,
                                            unsigned Modifier, llvm::Type *ArgTy,
                                            const CallExpr *E);
    llvm::Value *EmitNeonCall(llvm::Function *F,
                              SmallVectorImpl<llvm::Value*> &O,
                              const char *name,
                              unsigned shift = 0, bool rightshift = false);
    llvm::Value *EmitNeonSplat(llvm::Value *V, llvm::Constant *Idx,
                               const llvm::ElementCount &Count);
    llvm::Value *EmitNeonSplat(llvm::Value *V, llvm::Constant *Idx);
    llvm::Value *EmitNeonShiftVector(llvm::Value *V, llvm::Type *Ty,
                                     bool negateForRightShift);
    llvm::Value *EmitNeonRShiftImm(llvm::Value *Vec, llvm::Value *Amt,
                                   llvm::Type *Ty, bool usgn, const char *name);
    llvm::Value *vectorWrapScalar16(llvm::Value *Op);
    /// SVEBuiltinMemEltTy - Returns the memory element type for this memory
    /// access builtin.  Only required if it can't be inferred from the base
    /// pointer operand.
    llvm::Type *SVEBuiltinMemEltTy(SVETypeFlags TypeFlags);
  
    SmallVector<llvm::Type *, 2> getSVEOverloadTypes(SVETypeFlags TypeFlags,
                                                     llvm::Type *ReturnType,
                                                     ArrayRef<llvm::Value *> Ops);
    llvm::Type *getEltType(SVETypeFlags TypeFlags);
    llvm::ScalableVectorType *getSVEType(const SVETypeFlags &TypeFlags);
    llvm::ScalableVectorType *getSVEPredType(SVETypeFlags TypeFlags);
    llvm::Value *EmitSVEAllTruePred(SVETypeFlags TypeFlags);
    llvm::Value *EmitSVEDupX(llvm::Value *Scalar);
    llvm::Value *EmitSVEDupX(llvm::Value *Scalar, llvm::Type *Ty);
    llvm::Value *EmitSVEReinterpret(llvm::Value *Val, llvm::Type *Ty);
    llvm::Value *EmitSVEPMull(SVETypeFlags TypeFlags,
                              llvm::SmallVectorImpl<llvm::Value *> &Ops,
                              unsigned BuiltinID);
    llvm::Value *EmitSVEMovl(SVETypeFlags TypeFlags,
                             llvm::ArrayRef<llvm::Value *> Ops,
                             unsigned BuiltinID);
    llvm::Value *EmitSVEPredicateCast(llvm::Value *Pred,
                                      llvm::ScalableVectorType *VTy);
    llvm::Value *EmitSVEGatherLoad(SVETypeFlags TypeFlags,
                                   llvm::SmallVectorImpl<llvm::Value *> &Ops,
                                   unsigned IntID);
    llvm::Value *EmitSVEScatterStore(SVETypeFlags TypeFlags,
                                     llvm::SmallVectorImpl<llvm::Value *> &Ops,
                                     unsigned IntID);
    llvm::Value *EmitSVEMaskedLoad(const CallExpr *, llvm::Type *ReturnTy,
                                   SmallVectorImpl<llvm::Value *> &Ops,
                                   unsigned BuiltinID, bool IsZExtReturn);
    llvm::Value *EmitSVEMaskedStore(const CallExpr *,
                                    SmallVectorImpl<llvm::Value *> &Ops,
                                    unsigned BuiltinID);
    llvm::Value *EmitSVEPrefetchLoad(SVETypeFlags TypeFlags,
                                     SmallVectorImpl<llvm::Value *> &Ops,
                                     unsigned BuiltinID);
    llvm::Value *EmitSVEGatherPrefetch(SVETypeFlags TypeFlags,
                                       SmallVectorImpl<llvm::Value *> &Ops,
                                       unsigned IntID);
    llvm::Value *EmitSVEStructLoad(SVETypeFlags TypeFlags,
                                   SmallVectorImpl<llvm::Value *> &Ops, unsigned IntID);
    llvm::Value *EmitSVEStructStore(SVETypeFlags TypeFlags,
                                    SmallVectorImpl<llvm::Value *> &Ops,
                                    unsigned IntID);
    llvm::Value *EmitAArch64SVEBuiltinExpr(unsigned BuiltinID, const CallExpr *E);
  
    llvm::Value *EmitAArch64BuiltinExpr(unsigned BuiltinID, const CallExpr *E,
                                        llvm::Triple::ArchType Arch);
    llvm::Value *EmitBPFBuiltinExpr(unsigned BuiltinID, const CallExpr *E);
  
    llvm::Value *BuildVector(ArrayRef<llvm::Value*> Ops);
    llvm::Value *EmitX86BuiltinExpr(unsigned BuiltinID, const CallExpr *E);
    llvm::Value *EmitPPCBuiltinExpr(unsigned BuiltinID, const CallExpr *E);
    llvm::Value *EmitAMDGPUBuiltinExpr(unsigned BuiltinID, const CallExpr *E);
    llvm::Value *EmitSystemZBuiltinExpr(unsigned BuiltinID, const CallExpr *E);
    llvm::Value *EmitNVPTXBuiltinExpr(unsigned BuiltinID, const CallExpr *E);
    llvm::Value *EmitWebAssemblyBuiltinExpr(unsigned BuiltinID,
                                            const CallExpr *E);
    llvm::Value *EmitHexagonBuiltinExpr(unsigned BuiltinID, const CallExpr *E);
    llvm::Value *EmitRISCVBuiltinExpr(unsigned BuiltinID, const CallExpr *E,
                                      ReturnValueSlot ReturnValue);
    bool ProcessOrderScopeAMDGCN(llvm::Value *Order, llvm::Value *Scope,
                                 llvm::AtomicOrdering &AO,
                                 llvm::SyncScope::ID &SSID);
  
    enum class MSVCIntrin;
    llvm::Value *EmitMSVCBuiltinExpr(MSVCIntrin BuiltinID, const CallExpr *E);
  
    llvm::Value *EmitBuiltinAvailable(const VersionTuple &Version);
  
    llvm::Value *EmitObjCProtocolExpr(const ObjCProtocolExpr *E);
    llvm::Value *EmitObjCStringLiteral(const ObjCStringLiteral *E);
    llvm::Value *EmitObjCBoxedExpr(const ObjCBoxedExpr *E);
    llvm::Value *EmitObjCArrayLiteral(const ObjCArrayLiteral *E);
    llvm::Value *EmitObjCDictionaryLiteral(const ObjCDictionaryLiteral *E);
    llvm::Value *EmitObjCCollectionLiteral(const Expr *E,
                                  const ObjCMethodDecl *MethodWithObjects);
    llvm::Value *EmitObjCSelectorExpr(const ObjCSelectorExpr *E);
    RValue EmitObjCMessageExpr(const ObjCMessageExpr *E,
                               ReturnValueSlot Return = ReturnValueSlot());
  
    /// Retrieves the default cleanup kind for an ARC cleanup.
    /// Except under -fobjc-arc-eh, ARC cleanups are normal-only.
    CleanupKind getARCCleanupKind() {
      return CGM.getCodeGenOpts().ObjCAutoRefCountExceptions
               ? NormalAndEHCleanup : NormalCleanup;
    }
  
    // ARC primitives.
    void EmitARCInitWeak(Address addr, llvm::Value *value);
    void EmitARCDestroyWeak(Address addr);
    llvm::Value *EmitARCLoadWeak(Address addr);
    llvm::Value *EmitARCLoadWeakRetained(Address addr);
    llvm::Value *EmitARCStoreWeak(Address addr, llvm::Value *value, bool ignored);
    void emitARCCopyAssignWeak(QualType Ty, Address DstAddr, Address SrcAddr);
    void emitARCMoveAssignWeak(QualType Ty, Address DstAddr, Address SrcAddr);
    void EmitARCCopyWeak(Address dst, Address src);
    void EmitARCMoveWeak(Address dst, Address src);
    llvm::Value *EmitARCRetainAutorelease(QualType type, llvm::Value *value);
    llvm::Value *EmitARCRetainAutoreleaseNonBlock(llvm::Value *value);
    llvm::Value *EmitARCStoreStrong(LValue lvalue, llvm::Value *value,
                                    bool resultIgnored);
    llvm::Value *EmitARCStoreStrongCall(Address addr, llvm::Value *value,
                                        bool resultIgnored);
    llvm::Value *EmitARCRetain(QualType type, llvm::Value *value);
    llvm::Value *EmitARCRetainNonBlock(llvm::Value *value);
    llvm::Value *EmitARCRetainBlock(llvm::Value *value, bool mandatory);
    void EmitARCDestroyStrong(Address addr, ARCPreciseLifetime_t precise);
    void EmitARCRelease(llvm::Value *value, ARCPreciseLifetime_t precise);
    llvm::Value *EmitARCAutorelease(llvm::Value *value);
    llvm::Value *EmitARCAutoreleaseReturnValue(llvm::Value *value);
    llvm::Value *EmitARCRetainAutoreleaseReturnValue(llvm::Value *value);
    llvm::Value *EmitARCRetainAutoreleasedReturnValue(llvm::Value *value);
    llvm::Value *EmitARCUnsafeClaimAutoreleasedReturnValue(llvm::Value *value);
  
    llvm::Value *EmitObjCAutorelease(llvm::Value *value, llvm::Type *returnType);
    llvm::Value *EmitObjCRetainNonBlock(llvm::Value *value,
                                        llvm::Type *returnType);
    void EmitObjCRelease(llvm::Value *value, ARCPreciseLifetime_t precise);
  
    std::pair<LValue,llvm::Value*>
    EmitARCStoreAutoreleasing(const BinaryOperator *e);
    std::pair<LValue,llvm::Value*>
    EmitARCStoreStrong(const BinaryOperator *e, bool ignored);
    std::pair<LValue,llvm::Value*>
    EmitARCStoreUnsafeUnretained(const BinaryOperator *e, bool ignored);
  
    llvm::Value *EmitObjCAlloc(llvm::Value *value,
                               llvm::Type *returnType);
    llvm::Value *EmitObjCAllocWithZone(llvm::Value *value,
                                       llvm::Type *returnType);
    llvm::Value *EmitObjCAllocInit(llvm::Value *value, llvm::Type *resultType);
  
    llvm::Value *EmitObjCThrowOperand(const Expr *expr);
    llvm::Value *EmitObjCConsumeObject(QualType T, llvm::Value *Ptr);
    llvm::Value *EmitObjCExtendObjectLifetime(QualType T, llvm::Value *Ptr);
  
    llvm::Value *EmitARCExtendBlockObject(const Expr *expr);
    llvm::Value *EmitARCReclaimReturnedObject(const Expr *e,
                                              bool allowUnsafeClaim);
    llvm::Value *EmitARCRetainScalarExpr(const Expr *expr);
    llvm::Value *EmitARCRetainAutoreleaseScalarExpr(const Expr *expr);
    llvm::Value *EmitARCUnsafeUnretainedScalarExpr(const Expr *expr);
  
    void EmitARCIntrinsicUse(ArrayRef<llvm::Value*> values);
  
    void EmitARCNoopIntrinsicUse(ArrayRef<llvm::Value *> values);
  
    static Destroyer destroyARCStrongImprecise;
    static Destroyer destroyARCStrongPrecise;
    static Destroyer destroyARCWeak;
    static Destroyer emitARCIntrinsicUse;
    static Destroyer destroyNonTrivialCStruct;
  
    void EmitObjCAutoreleasePoolPop(llvm::Value *Ptr);
    llvm::Value *EmitObjCAutoreleasePoolPush();
    llvm::Value *EmitObjCMRRAutoreleasePoolPush();
    void EmitObjCAutoreleasePoolCleanup(llvm::Value *Ptr);
    void EmitObjCMRRAutoreleasePoolPop(llvm::Value *Ptr);
  
    /// Emits a reference binding to the passed in expression.
    RValue EmitReferenceBindingToExpr(const Expr *E);
  
    //===--------------------------------------------------------------------===//
    //                           Expression Emission
    //===--------------------------------------------------------------------===//
  
    // Expressions are broken into three classes: scalar, complex, aggregate.
  
    /// EmitScalarExpr - Emit the computation of the specified expression of LLVM
    /// scalar type, returning the result.
    llvm::Value *EmitScalarExpr(const Expr *E , bool IgnoreResultAssign = false);
  
    /// Emit a conversion from the specified type to the specified destination
    /// type, both of which are LLVM scalar types.
    llvm::Value *EmitScalarConversion(llvm::Value *Src, QualType SrcTy,
                                      QualType DstTy, SourceLocation Loc);
  
    /// Emit a conversion from the specified complex type to the specified
    /// destination type, where the destination type is an LLVM scalar type.
    llvm::Value *EmitComplexToScalarConversion(ComplexPairTy Src, QualType SrcTy,
                                               QualType DstTy,
                                               SourceLocation Loc);
  
    /// EmitAggExpr - Emit the computation of the specified expression
    /// of aggregate type.  The result is computed into the given slot,
    /// which may be null to indicate that the value is not needed.
    void EmitAggExpr(const Expr *E, AggValueSlot AS);
  
    /// EmitAggExprToLValue - Emit the computation of the specified expression of
    /// aggregate type into a temporary LValue.
    LValue EmitAggExprToLValue(const Expr *E);
  
    /// Build all the stores needed to initialize an aggregate at Dest with the
    /// value Val.
    void EmitAggregateStore(llvm::Value *Val, Address Dest, bool DestIsVolatile);
  
    /// EmitExtendGCLifetime - Given a pointer to an Objective-C object,
    /// make sure it survives garbage collection until this point.
    void EmitExtendGCLifetime(llvm::Value *object);
  
    /// EmitComplexExpr - Emit the computation of the specified expression of
    /// complex type, returning the result.
    ComplexPairTy EmitComplexExpr(const Expr *E,
                                  bool IgnoreReal = false,
                                  bool IgnoreImag = false);
  
    /// EmitComplexExprIntoLValue - Emit the given expression of complex
    /// type and place its result into the specified l-value.
    void EmitComplexExprIntoLValue(const Expr *E, LValue dest, bool isInit);
  
    /// EmitStoreOfComplex - Store a complex number into the specified l-value.
    void EmitStoreOfComplex(ComplexPairTy V, LValue dest, bool isInit);
  
    /// EmitLoadOfComplex - Load a complex number from the specified l-value.
    ComplexPairTy EmitLoadOfComplex(LValue src, SourceLocation loc);
  
    Address emitAddrOfRealComponent(Address complex, QualType complexType);
    Address emitAddrOfImagComponent(Address complex, QualType complexType);
  
    /// AddInitializerToStaticVarDecl - Add the initializer for 'D' to the
    /// global variable that has already been created for it.  If the initializer
    /// has a different type than GV does, this may free GV and return a different
    /// one.  Otherwise it just returns GV.
    llvm::GlobalVariable *
    AddInitializerToStaticVarDecl(const VarDecl &D,
                                  llvm::GlobalVariable *GV);
  
    // Emit an @llvm.invariant.start call for the given memory region.
    void EmitInvariantStart(llvm::Constant *Addr, CharUnits Size);
  
    /// EmitCXXGlobalVarDeclInit - Create the initializer for a C++
    /// variable with global storage.
    void EmitCXXGlobalVarDeclInit(const VarDecl &D, llvm::Constant *DeclPtr,
                                  bool PerformInit);
  
    llvm::Constant *createAtExitStub(const VarDecl &VD, llvm::FunctionCallee Dtor,
                                     llvm::Constant *Addr);
  
    /// Call atexit() with a function that passes the given argument to
    /// the given function.
    void registerGlobalDtorWithAtExit(const VarDecl &D, llvm::FunctionCallee fn,
                                      llvm::Constant *addr);
  
    /// Call atexit() with function dtorStub.
    void registerGlobalDtorWithAtExit(llvm::Constant *dtorStub);
  
    /// Call unatexit() with function dtorStub.
    llvm::Value *unregisterGlobalDtorWithUnAtExit(llvm::Constant *dtorStub);
  
    /// Emit code in this function to perform a guarded variable
    /// initialization.  Guarded initializations are used when it's not
    /// possible to prove that an initialization will be done exactly
    /// once, e.g. with a static local variable or a static data member
    /// of a class template.
    void EmitCXXGuardedInit(const VarDecl &D, llvm::GlobalVariable *DeclPtr,
                            bool PerformInit);
  
    enum class GuardKind { VariableGuard, TlsGuard };
  
    /// Emit a branch to select whether or not to perform guarded initialization.
    void EmitCXXGuardedInitBranch(llvm::Value *NeedsInit,
                                  llvm::BasicBlock *InitBlock,
                                  llvm::BasicBlock *NoInitBlock,
                                  GuardKind Kind, const VarDecl *D);
  
    /// GenerateCXXGlobalInitFunc - Generates code for initializing global
    /// variables.
    void
    GenerateCXXGlobalInitFunc(llvm::Function *Fn,
                              ArrayRef<llvm::Function *> CXXThreadLocals,
                              ConstantAddress Guard = ConstantAddress::invalid());
  
    /// GenerateCXXGlobalCleanUpFunc - Generates code for cleaning up global
    /// variables.
    void GenerateCXXGlobalCleanUpFunc(
        llvm::Function *Fn,
        ArrayRef<std::tuple<llvm::FunctionType *, llvm::WeakTrackingVH,
                            llvm::Constant *>>
            DtorsOrStermFinalizers);
  
    void GenerateCXXGlobalVarDeclInitFunc(llvm::Function *Fn,
                                          const VarDecl *D,
                                          llvm::GlobalVariable *Addr,
                                          bool PerformInit);
  
    void EmitCXXConstructExpr(const CXXConstructExpr *E, AggValueSlot Dest);
  
    void EmitSynthesizedCXXCopyCtor(Address Dest, Address Src, const Expr *Exp);
  
    void EmitCXXThrowExpr(const CXXThrowExpr *E, bool KeepInsertionPoint = true);
  
    RValue EmitAtomicExpr(AtomicExpr *E);
  
    //===--------------------------------------------------------------------===//
    //                         Annotations Emission
    //===--------------------------------------------------------------------===//
  
    /// Emit an annotation call (intrinsic).
    llvm::Value *EmitAnnotationCall(llvm::Function *AnnotationFn,
                                    llvm::Value *AnnotatedVal,
                                    StringRef AnnotationStr,
                                    SourceLocation Location,
                                    const AnnotateAttr *Attr);
  
    /// Emit local annotations for the local variable V, declared by D.
    void EmitVarAnnotations(const VarDecl *D, llvm::Value *V);
  
    /// Emit field annotations for the given field & value. Returns the
    /// annotation result.
    Address EmitFieldAnnotations(const FieldDecl *D, Address V);
  
    //===--------------------------------------------------------------------===//
    //                             Internal Helpers
    //===--------------------------------------------------------------------===//
  
    /// ContainsLabel - Return true if the statement contains a label in it.  If
    /// this statement is not executed normally, it not containing a label means
    /// that we can just remove the code.
    static bool ContainsLabel(const Stmt *S, bool IgnoreCaseStmts = false);
  
    /// containsBreak - Return true if the statement contains a break out of it.
    /// If the statement (recursively) contains a switch or loop with a break
    /// inside of it, this is fine.
    static bool containsBreak(const Stmt *S);
  
    /// Determine if the given statement might introduce a declaration into the
    /// current scope, by being a (possibly-labelled) DeclStmt.
    static bool mightAddDeclToScope(const Stmt *S);
  
    /// ConstantFoldsToSimpleInteger - If the specified expression does not fold
    /// to a constant, or if it does but contains a label, return false.  If it
    /// constant folds return true and set the boolean result in Result.
    bool ConstantFoldsToSimpleInteger(const Expr *Cond, bool &Result,
                                      bool AllowLabels = false);
  
    /// ConstantFoldsToSimpleInteger - If the specified expression does not fold
    /// to a constant, or if it does but contains a label, return false.  If it
    /// constant folds return true and set the folded value.
    bool ConstantFoldsToSimpleInteger(const Expr *Cond, llvm::APSInt &Result,
                                      bool AllowLabels = false);
  
    /// isInstrumentedCondition - Determine whether the given condition is an
    /// instrumentable condition (i.e. no "&&" or "||").
    static bool isInstrumentedCondition(const Expr *C);
  
    /// EmitBranchToCounterBlock - Emit a conditional branch to a new block that
    /// increments a profile counter based on the semantics of the given logical
    /// operator opcode.  This is used to instrument branch condition coverage
    /// for logical operators.
    void EmitBranchToCounterBlock(const Expr *Cond, BinaryOperator::Opcode LOp,
                                  llvm::BasicBlock *TrueBlock,
                                  llvm::BasicBlock *FalseBlock,
                                  uint64_t TrueCount = 0,
                                  Stmt::Likelihood LH = Stmt::LH_None,
                                  const Expr *CntrIdx = nullptr);
  
    /// EmitBranchOnBoolExpr - Emit a branch on a boolean condition (e.g. for an
    /// if statement) to the specified blocks.  Based on the condition, this might
    /// try to simplify the codegen of the conditional based on the branch.
    /// TrueCount should be the number of times we expect the condition to
    /// evaluate to true based on PGO data.
    void EmitBranchOnBoolExpr(const Expr *Cond, llvm::BasicBlock *TrueBlock,
                              llvm::BasicBlock *FalseBlock, uint64_t TrueCount,
                              Stmt::Likelihood LH = Stmt::LH_None);
  
    /// Given an assignment `*LHS = RHS`, emit a test that checks if \p RHS is
    /// nonnull, if \p LHS is marked _Nonnull.
    void EmitNullabilityCheck(LValue LHS, llvm::Value *RHS, SourceLocation Loc);
  
    /// An enumeration which makes it easier to specify whether or not an
    /// operation is a subtraction.
    enum { NotSubtraction = false, IsSubtraction = true };
  
    /// Same as IRBuilder::CreateInBoundsGEP, but additionally emits a check to
    /// detect undefined behavior when the pointer overflow sanitizer is enabled.
    /// \p SignedIndices indicates whether any of the GEP indices are signed.
    /// \p IsSubtraction indicates whether the expression used to form the GEP
    /// is a subtraction.
    llvm::Value *EmitCheckedInBoundsGEP(llvm::Value *Ptr,
                                        ArrayRef<llvm::Value *> IdxList,
                                        bool SignedIndices,
                                        bool IsSubtraction,
                                        SourceLocation Loc,
                                        const Twine &Name = "");
  
    /// Specifies which type of sanitizer check to apply when handling a
    /// particular builtin.
    enum BuiltinCheckKind {
      BCK_CTZPassedZero,
      BCK_CLZPassedZero,
    };
  
    /// Emits an argument for a call to a builtin. If the builtin sanitizer is
    /// enabled, a runtime check specified by \p Kind is also emitted.
    llvm::Value *EmitCheckedArgForBuiltin(const Expr *E, BuiltinCheckKind Kind);
  
    /// Emit a description of a type in a format suitable for passing to
    /// a runtime sanitizer handler.
    llvm::Constant *EmitCheckTypeDescriptor(QualType T);
  
    /// Convert a value into a format suitable for passing to a runtime
    /// sanitizer handler.
    llvm::Value *EmitCheckValue(llvm::Value *V);
  
    /// Emit a description of a source location in a format suitable for
    /// passing to a runtime sanitizer handler.
    llvm::Constant *EmitCheckSourceLocation(SourceLocation Loc);
  
    /// Create a basic block that will either trap or call a handler function in
    /// the UBSan runtime with the provided arguments, and create a conditional
    /// branch to it.
    void EmitCheck(ArrayRef<std::pair<llvm::Value *, SanitizerMask>> Checked,
                   SanitizerHandler Check, ArrayRef<llvm::Constant *> StaticArgs,
                   ArrayRef<llvm::Value *> DynamicArgs);
  
    /// Emit a slow path cross-DSO CFI check which calls __cfi_slowpath
    /// if Cond if false.
    void EmitCfiSlowPathCheck(SanitizerMask Kind, llvm::Value *Cond,
                              llvm::ConstantInt *TypeId, llvm::Value *Ptr,
                              ArrayRef<llvm::Constant *> StaticArgs);
  
    /// Emit a reached-unreachable diagnostic if \p Loc is valid and runtime
    /// checking is enabled. Otherwise, just emit an unreachable instruction.
    void EmitUnreachable(SourceLocation Loc);
  
    /// Create a basic block that will call the trap intrinsic, and emit a
    /// conditional branch to it, for the -ftrapv checks.
    void EmitTrapCheck(llvm::Value *Checked, SanitizerHandler CheckHandlerID);
  
    /// Emit a call to trap or debugtrap and attach function attribute
    /// "trap-func-name" if specified.
    llvm::CallInst *EmitTrapCall(llvm::Intrinsic::ID IntrID);
  
    /// Emit a stub for the cross-DSO CFI check function.
    void EmitCfiCheckStub();
  
    /// Emit a cross-DSO CFI failure handling function.
    void EmitCfiCheckFail();
  
    /// Create a check for a function parameter that may potentially be
    /// declared as non-null.
    void EmitNonNullArgCheck(RValue RV, QualType ArgType, SourceLocation ArgLoc,
                             AbstractCallee AC, unsigned ParmNum);
  
    /// EmitCallArg - Emit a single call argument.
    void EmitCallArg(CallArgList &args, const Expr *E, QualType ArgType);
  
    /// EmitDelegateCallArg - We are performing a delegate call; that
    /// is, the current function is delegating to another one.  Produce
    /// a r-value suitable for passing the given parameter.
    void EmitDelegateCallArg(CallArgList &args, const VarDecl *param,
                             SourceLocation loc);
  
    /// SetFPAccuracy - Set the minimum required accuracy of the given floating
    /// point operation, expressed as the maximum relative error in ulp.
    void SetFPAccuracy(llvm::Value *Val, float Accuracy);
  
    /// SetFPModel - Control floating point behavior via fp-model settings.
    void SetFPModel();
  
    /// Set the codegen fast-math flags.
    void SetFastMathFlags(FPOptions FPFeatures);
  
  private:
    llvm::MDNode *getRangeForLoadFromType(QualType Ty);
    void EmitReturnOfRValue(RValue RV, QualType Ty);
  
    void deferPlaceholderReplacement(llvm::Instruction *Old, llvm::Value *New);
  
    llvm::SmallVector<std::pair<llvm::WeakTrackingVH, llvm::Value *>, 4>
        DeferredReplacements;
  
    /// Set the address of a local variable.
    void setAddrOfLocalVar(const VarDecl *VD, Address Addr) {
      assert(!LocalDeclMap.count(VD) && "Decl already exists in LocalDeclMap!");
      LocalDeclMap.insert({VD, Addr});
    }
  
    /// ExpandTypeFromArgs - Reconstruct a structure of type \arg Ty
    /// from function arguments into \arg Dst. See ABIArgInfo::Expand.
    ///
    /// \param AI - The first function argument of the expansion.
    void ExpandTypeFromArgs(QualType Ty, LValue Dst,
                            llvm::Function::arg_iterator &AI);
  
    /// ExpandTypeToArgs - Expand an CallArg \arg Arg, with the LLVM type for \arg
    /// Ty, into individual arguments on the provided vector \arg IRCallArgs,
    /// starting at index \arg IRCallArgPos. See ABIArgInfo::Expand.
    void ExpandTypeToArgs(QualType Ty, CallArg Arg, llvm::FunctionType *IRFuncTy,
                          SmallVectorImpl<llvm::Value *> &IRCallArgs,
                          unsigned &IRCallArgPos);
  
    llvm::Value* EmitAsmInput(const TargetInfo::ConstraintInfo &Info,
                              const Expr *InputExpr, std::string &ConstraintStr);
  
    llvm::Value* EmitAsmInputLValue(const TargetInfo::ConstraintInfo &Info,
                                    LValue InputValue, QualType InputType,
                                    std::string &ConstraintStr,
                                    SourceLocation Loc);
  
    /// Attempts to statically evaluate the object size of E. If that
    /// fails, emits code to figure the size of E out for us. This is
    /// pass_object_size aware.
    ///
    /// If EmittedExpr is non-null, this will use that instead of re-emitting E.
    llvm::Value *evaluateOrEmitBuiltinObjectSize(const Expr *E, unsigned Type,
                                                 llvm::IntegerType *ResType,
                                                 llvm::Value *EmittedE,
                                                 bool IsDynamic);
  
    /// Emits the size of E, as required by __builtin_object_size. This
    /// function is aware of pass_object_size parameters, and will act accordingly
    /// if E is a parameter with the pass_object_size attribute.
    llvm::Value *emitBuiltinObjectSize(const Expr *E, unsigned Type,
                                       llvm::IntegerType *ResType,
                                       llvm::Value *EmittedE,
                                       bool IsDynamic);
  
    void emitZeroOrPatternForAutoVarInit(QualType type, const VarDecl &D,
                                         Address Loc);
  
  public:
    enum class EvaluationOrder {
      ///! No language constraints on evaluation order.
      Default,
      ///! Language semantics require left-to-right evaluation.
      ForceLeftToRight,
      ///! Language semantics require right-to-left evaluation.
      ForceRightToLeft
    };
  
    // Wrapper for function prototype sources. Wraps either a FunctionProtoType or
    // an ObjCMethodDecl.
    struct PrototypeWrapper {
      llvm::PointerUnion<const FunctionProtoType *, const ObjCMethodDecl *> P;
  
      PrototypeWrapper(const FunctionProtoType *FT) : P(FT) {}
      PrototypeWrapper(const ObjCMethodDecl *MD) : P(MD) {}
    };
  
    void EmitCallArgs(CallArgList &Args, PrototypeWrapper Prototype,
                      llvm::iterator_range<CallExpr::const_arg_iterator> ArgRange,
                      AbstractCallee AC = AbstractCallee(),
                      unsigned ParamsToSkip = 0,
                      EvaluationOrder Order = EvaluationOrder::Default);
  
    /// EmitPointerWithAlignment - Given an expression with a pointer type,
    /// emit the value and compute our best estimate of the alignment of the
    /// pointee.
    ///
    /// \param BaseInfo - If non-null, this will be initialized with
    /// information about the source of the alignment and the may-alias
    /// attribute.  Note that this function will conservatively fall back on
    /// the type when it doesn't recognize the expression and may-alias will
    /// be set to false.
    ///
    /// One reasonable way to use this information is when there's a language
    /// guarantee that the pointer must be aligned to some stricter value, and
    /// we're simply trying to ensure that sufficiently obvious uses of under-
    /// aligned objects don't get miscompiled; for example, a placement new
    /// into the address of a local variable.  In such a case, it's quite
    /// reasonable to just ignore the returned alignment when it isn't from an
    /// explicit source.
    Address EmitPointerWithAlignment(const Expr *Addr,
                                     LValueBaseInfo *BaseInfo = nullptr,
                                     TBAAAccessInfo *TBAAInfo = nullptr);
  
    /// If \p E references a parameter with pass_object_size info or a constant
    /// array size modifier, emit the object size divided by the size of \p EltTy.
    /// Otherwise return null.
    llvm::Value *LoadPassedObjectSize(const Expr *E, QualType EltTy);
  
    void EmitSanitizerStatReport(llvm::SanitizerStatKind SSK);
  
    struct MultiVersionResolverOption {
      llvm::Function *Function;
      struct Conds {
        StringRef Architecture;
        llvm::SmallVector<StringRef, 8> Features;
  
        Conds(StringRef Arch, ArrayRef<StringRef> Feats)
            : Architecture(Arch), Features(Feats.begin(), Feats.end()) {}
      } Conditions;
  
      MultiVersionResolverOption(llvm::Function *F, StringRef Arch,
                                 ArrayRef<StringRef> Feats)
          : Function(F), Conditions(Arch, Feats) {}
    };
  
    // Emits the body of a multiversion function's resolver. Assumes that the
    // options are already sorted in the proper order, with the 'default' option
    // last (if it exists).
    void EmitMultiVersionResolver(llvm::Function *Resolver,
                                  ArrayRef<MultiVersionResolverOption> Options);
  
    static uint64_t GetX86CpuSupportsMask(ArrayRef<StringRef> FeatureStrs);
  
  private:
    QualType getVarArgType(const Expr *Arg);
  
    void EmitDeclMetadata();
  
    BlockByrefHelpers *buildByrefHelpers(llvm::StructType &byrefType,
                                    const AutoVarEmission &emission);
  
    void AddObjCARCExceptionMetadata(llvm::Instruction *Inst);
  
    llvm::Value *GetValueForARMHint(unsigned BuiltinID);
    llvm::Value *EmitX86CpuIs(const CallExpr *E);
    llvm::Value *EmitX86CpuIs(StringRef CPUStr);
    llvm::Value *EmitX86CpuSupports(const CallExpr *E);
    llvm::Value *EmitX86CpuSupports(ArrayRef<StringRef> FeatureStrs);
    llvm::Value *EmitX86CpuSupports(uint64_t Mask);
    llvm::Value *EmitX86CpuInit();
    llvm::Value *FormResolverCondition(const MultiVersionResolverOption &RO);
  };
  
  /// TargetFeatures - This class is used to check whether the builtin function
  /// has the required tagert specific features. It is able to support the
  /// combination of ','(and), '|'(or), and '()'. By default, the priority of
  /// ',' is higher than that of '|' .
  /// E.g:
  /// A,B|C means the builtin function requires both A and B, or C.
  /// If we want the builtin function requires both A and B, or both A and C,
  /// there are two ways: A,B|A,C or A,(B|C).
  /// The FeaturesList should not contain spaces, and brackets must appear in
  /// pairs.
  class TargetFeatures {
    struct FeatureListStatus {
      bool HasFeatures;
      StringRef CurFeaturesList;
    };
  
    const llvm::StringMap<bool> &CallerFeatureMap;
  
    FeatureListStatus getAndFeatures(StringRef FeatureList) {
      int InParentheses = 0;
      bool HasFeatures = true;
      size_t SubexpressionStart = 0;
      for (size_t i = 0, e = FeatureList.size(); i < e; ++i) {
        char CurrentToken = FeatureList[i];
        switch (CurrentToken) {
        default:
          break;
        case '(':
          if (InParentheses == 0)
            SubexpressionStart = i + 1;
          ++InParentheses;
          break;
        case ')':
          --InParentheses;
          assert(InParentheses >= 0 && "Parentheses are not in pair");
          LLVM_FALLTHROUGH;
        case '|':
        case ',':
          if (InParentheses == 0) {
            if (HasFeatures && i != SubexpressionStart) {
              StringRef F = FeatureList.slice(SubexpressionStart, i);
              HasFeatures = CurrentToken == ')' ? hasRequiredFeatures(F)
                                                : CallerFeatureMap.lookup(F);
            }
            SubexpressionStart = i + 1;
            if (CurrentToken == '|') {
              return {HasFeatures, FeatureList.substr(SubexpressionStart)};
            }
          }
          break;
        }
      }
      assert(InParentheses == 0 && "Parentheses are not in pair");
      if (HasFeatures && SubexpressionStart != FeatureList.size())
        HasFeatures =
            CallerFeatureMap.lookup(FeatureList.substr(SubexpressionStart));
      return {HasFeatures, StringRef()};
    }
  
  public:
    bool hasRequiredFeatures(StringRef FeatureList) {
      FeatureListStatus FS = {false, FeatureList};
      while (!FS.HasFeatures && !FS.CurFeaturesList.empty())
        FS = getAndFeatures(FS.CurFeaturesList);
      return FS.HasFeatures;
    }
  
    TargetFeatures(const llvm::StringMap<bool> &CallerFeatureMap)
        : CallerFeatureMap(CallerFeatureMap) {}
  };
  
  inline DominatingLLVMValue::saved_type
  DominatingLLVMValue::save(CodeGenFunction &CGF, llvm::Value *value) {
    if (!needsSaving(value)) return saved_type(value, false);
  
    // Otherwise, we need an alloca.
    auto align = CharUnits::fromQuantity(
              CGF.CGM.getDataLayout().getPrefTypeAlignment(value->getType()));
    Address alloca =
      CGF.CreateTempAlloca(value->getType(), align, "cond-cleanup.save");
    CGF.Builder.CreateStore(value, alloca);
  
    return saved_type(alloca.getPointer(), true);
  }
  
  inline llvm::Value *DominatingLLVMValue::restore(CodeGenFunction &CGF,
                                                   saved_type value) {
    // If the value says it wasn't saved, trust that it's still dominating.
    if (!value.getInt()) return value.getPointer();
  
    // Otherwise, it should be an alloca instruction, as set up in save().
    auto alloca = cast<llvm::AllocaInst>(value.getPointer());
    return CGF.Builder.CreateAlignedLoad(alloca->getAllocatedType(), alloca,
                                         alloca->getAlign());
  }
  
  }  // end namespace CodeGen
  
  // Map the LangOption for floating point exception behavior into
  // the corresponding enum in the IR.
  llvm::fp::ExceptionBehavior
  ToConstrainedExceptMD(LangOptions::FPExceptionModeKind Kind);
  }  // end namespace clang
  
  #endif
  