Import LLVM 10.0.0 release including clang, lld and lldb.

ok hackroom
tested by plenty

1 files changed, 1532 insertions, 0 deletions

diff --git a/gnu/llvm/clang/lib/CodeGen/CodeGenModule.h b/gnu/llvm/clang/lib/CodeGen/CodeGenModule.h
new file mode 100644
index 00000000000..115e754bb39
--- /dev/null
+++ b/gnu/llvm/clang/lib/CodeGen/CodeGenModule.h
@@ -0,0 +1,1532 @@
+//===--- CodeGenModule.h - Per-Module 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-translation-unit state used for llvm translation.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_LIB_CODEGEN_CODEGENMODULE_H
+#define LLVM_CLANG_LIB_CODEGEN_CODEGENMODULE_H
+
+#include "CGVTables.h"
+#include "CodeGenTypeCache.h"
+#include "CodeGenTypes.h"
+#include "SanitizerMetadata.h"
+#include "clang/AST/DeclCXX.h"
+#include "clang/AST/DeclObjC.h"
+#include "clang/AST/DeclOpenMP.h"
+#include "clang/AST/GlobalDecl.h"
+#include "clang/AST/Mangle.h"
+#include "clang/Basic/ABI.h"
+#include "clang/Basic/LangOptions.h"
+#include "clang/Basic/Module.h"
+#include "clang/Basic/SanitizerBlacklist.h"
+#include "clang/Basic/XRayLists.h"
+#include "llvm/ADT/DenseMap.h"
+#include "llvm/ADT/SetVector.h"
+#include "llvm/ADT/SmallPtrSet.h"
+#include "llvm/ADT/StringMap.h"
+#include "llvm/IR/Module.h"
+#include "llvm/IR/ValueHandle.h"
+#include "llvm/Transforms/Utils/SanitizerStats.h"
+
+namespace llvm {
+class Module;
+class Constant;
+class ConstantInt;
+class Function;
+class GlobalValue;
+class DataLayout;
+class FunctionType;
+class LLVMContext;
+class OpenMPIRBuilder;
+class IndexedInstrProfReader;
+}
+
+namespace clang {
+class ASTContext;
+class AtomicType;
+class FunctionDecl;
+class IdentifierInfo;
+class ObjCMethodDecl;
+class ObjCImplementationDecl;
+class ObjCCategoryImplDecl;
+class ObjCProtocolDecl;
+class ObjCEncodeExpr;
+class BlockExpr;
+class CharUnits;
+class Decl;
+class Expr;
+class Stmt;
+class InitListExpr;
+class StringLiteral;
+class NamedDecl;
+class ValueDecl;
+class VarDecl;
+class LangOptions;
+class CodeGenOptions;
+class HeaderSearchOptions;
+class PreprocessorOptions;
+class DiagnosticsEngine;
+class AnnotateAttr;
+class CXXDestructorDecl;
+class Module;
+class CoverageSourceInfo;
+class TargetAttr;
+class InitSegAttr;
+struct ParsedTargetAttr;
+
+namespace CodeGen {
+
+class CallArgList;
+class CodeGenFunction;
+class CodeGenTBAA;
+class CGCXXABI;
+class CGDebugInfo;
+class CGObjCRuntime;
+class CGOpenCLRuntime;
+class CGOpenMPRuntime;
+class CGCUDARuntime;
+class BlockFieldFlags;
+class FunctionArgList;
+class CoverageMappingModuleGen;
+class TargetCodeGenInfo;
+
+enum ForDefinition_t : bool {
+  NotForDefinition = false,
+  ForDefinition = true
+};
+
+struct OrderGlobalInits {
+  unsigned int priority;
+  unsigned int lex_order;
+  OrderGlobalInits(unsigned int p, unsigned int l)
+      : priority(p), lex_order(l) {}
+
+  bool operator==(const OrderGlobalInits &RHS) const {
+    return priority == RHS.priority && lex_order == RHS.lex_order;
+  }
+
+  bool operator<(const OrderGlobalInits &RHS) const {
+    return std::tie(priority, lex_order) <
+           std::tie(RHS.priority, RHS.lex_order);
+  }
+};
+
+struct ObjCEntrypoints {
+  ObjCEntrypoints() { memset(this, 0, sizeof(*this)); }
+
+  /// void objc_alloc(id);
+  llvm::FunctionCallee objc_alloc;
+
+  /// void objc_allocWithZone(id);
+  llvm::FunctionCallee objc_allocWithZone;
+
+  /// void objc_alloc_init(id);
+  llvm::FunctionCallee objc_alloc_init;
+
+  /// void objc_autoreleasePoolPop(void*);
+  llvm::FunctionCallee objc_autoreleasePoolPop;
+
+  /// void objc_autoreleasePoolPop(void*);
+  /// Note this method is used when we are using exception handling
+  llvm::FunctionCallee objc_autoreleasePoolPopInvoke;
+
+  /// void *objc_autoreleasePoolPush(void);
+  llvm::Function *objc_autoreleasePoolPush;
+
+  /// id objc_autorelease(id);
+  llvm::Function *objc_autorelease;
+
+  /// id objc_autorelease(id);
+  /// Note this is the runtime method not the intrinsic.
+  llvm::FunctionCallee objc_autoreleaseRuntimeFunction;
+
+  /// id objc_autoreleaseReturnValue(id);
+  llvm::Function *objc_autoreleaseReturnValue;
+
+  /// void objc_copyWeak(id *dest, id *src);
+  llvm::Function *objc_copyWeak;
+
+  /// void objc_destroyWeak(id*);
+  llvm::Function *objc_destroyWeak;
+
+  /// id objc_initWeak(id*, id);
+  llvm::Function *objc_initWeak;
+
+  /// id objc_loadWeak(id*);
+  llvm::Function *objc_loadWeak;
+
+  /// id objc_loadWeakRetained(id*);
+  llvm::Function *objc_loadWeakRetained;
+
+  /// void objc_moveWeak(id *dest, id *src);
+  llvm::Function *objc_moveWeak;
+
+  /// id objc_retain(id);
+  llvm::Function *objc_retain;
+
+  /// id objc_retain(id);
+  /// Note this is the runtime method not the intrinsic.
+  llvm::FunctionCallee objc_retainRuntimeFunction;
+
+  /// id objc_retainAutorelease(id);
+  llvm::Function *objc_retainAutorelease;
+
+  /// id objc_retainAutoreleaseReturnValue(id);
+  llvm::Function *objc_retainAutoreleaseReturnValue;
+
+  /// id objc_retainAutoreleasedReturnValue(id);
+  llvm::Function *objc_retainAutoreleasedReturnValue;
+
+  /// id objc_retainBlock(id);
+  llvm::Function *objc_retainBlock;
+
+  /// void objc_release(id);
+  llvm::Function *objc_release;
+
+  /// void objc_release(id);
+  /// Note this is the runtime method not the intrinsic.
+  llvm::FunctionCallee objc_releaseRuntimeFunction;
+
+  /// void objc_storeStrong(id*, id);
+  llvm::Function *objc_storeStrong;
+
+  /// id objc_storeWeak(id*, id);
+  llvm::Function *objc_storeWeak;
+
+  /// id objc_unsafeClaimAutoreleasedReturnValue(id);
+  llvm::Function *objc_unsafeClaimAutoreleasedReturnValue;
+
+  /// A void(void) inline asm to use to mark that the return value of
+  /// a call will be immediately retain.
+  llvm::InlineAsm *retainAutoreleasedReturnValueMarker;
+
+  /// void clang.arc.use(...);
+  llvm::Function *clang_arc_use;
+};
+
+/// This class records statistics on instrumentation based profiling.
+class InstrProfStats {
+  uint32_t VisitedInMainFile;
+  uint32_t MissingInMainFile;
+  uint32_t Visited;
+  uint32_t Missing;
+  uint32_t Mismatched;
+
+public:
+  InstrProfStats()
+      : VisitedInMainFile(0), MissingInMainFile(0), Visited(0), Missing(0),
+        Mismatched(0) {}
+  /// Record that we've visited a function and whether or not that function was
+  /// in the main source file.
+  void addVisited(bool MainFile) {
+    if (MainFile)
+      ++VisitedInMainFile;
+    ++Visited;
+  }
+  /// Record that a function we've visited has no profile data.
+  void addMissing(bool MainFile) {
+    if (MainFile)
+      ++MissingInMainFile;
+    ++Missing;
+  }
+  /// Record that a function we've visited has mismatched profile data.
+  void addMismatched(bool MainFile) { ++Mismatched; }
+  /// Whether or not the stats we've gathered indicate any potential problems.
+  bool hasDiagnostics() { return Missing || Mismatched; }
+  /// Report potential problems we've found to \c Diags.
+  void reportDiagnostics(DiagnosticsEngine &Diags, StringRef MainFile);
+};
+
+/// A pair of helper functions for a __block variable.
+class BlockByrefHelpers : public llvm::FoldingSetNode {
+  // MSVC requires this type to be complete in order to process this
+  // header.
+public:
+  llvm::Constant *CopyHelper;
+  llvm::Constant *DisposeHelper;
+
+  /// The alignment of the field.  This is important because
+  /// different offsets to the field within the byref struct need to
+  /// have different helper functions.
+  CharUnits Alignment;
+
+  BlockByrefHelpers(CharUnits alignment)
+      : CopyHelper(nullptr), DisposeHelper(nullptr), Alignment(alignment) {}
+  BlockByrefHelpers(const BlockByrefHelpers &) = default;
+  virtual ~BlockByrefHelpers();
+
+  void Profile(llvm::FoldingSetNodeID &id) const {
+    id.AddInteger(Alignment.getQuantity());
+    profileImpl(id);
+  }
+  virtual void profileImpl(llvm::FoldingSetNodeID &id) const = 0;
+
+  virtual bool needsCopy() const { return true; }
+  virtual void emitCopy(CodeGenFunction &CGF, Address dest, Address src) = 0;
+
+  virtual bool needsDispose() const { return true; }
+  virtual void emitDispose(CodeGenFunction &CGF, Address field) = 0;
+};
+
+/// This class organizes the cross-function state that is used while generating
+/// LLVM code.
+class CodeGenModule : public CodeGenTypeCache {
+  CodeGenModule(const CodeGenModule &) = delete;
+  void operator=(const CodeGenModule &) = delete;
+
+public:
+  struct Structor {
+    Structor() : Priority(0), Initializer(nullptr), AssociatedData(nullptr) {}
+    Structor(int Priority, llvm::Constant *Initializer,
+             llvm::Constant *AssociatedData)
+        : Priority(Priority), Initializer(Initializer),
+          AssociatedData(AssociatedData) {}
+    int Priority;
+    llvm::Constant *Initializer;
+    llvm::Constant *AssociatedData;
+  };
+
+  typedef std::vector<Structor> CtorList;
+
+private:
+  ASTContext &Context;
+  const LangOptions &LangOpts;
+  const HeaderSearchOptions &HeaderSearchOpts; // Only used for debug info.
+  const PreprocessorOptions &PreprocessorOpts; // Only used for debug info.
+  const CodeGenOptions &CodeGenOpts;
+  llvm::Module &TheModule;
+  DiagnosticsEngine &Diags;
+  const TargetInfo &Target;
+  std::unique_ptr<CGCXXABI> ABI;
+  llvm::LLVMContext &VMContext;
+
+  std::unique_ptr<CodeGenTBAA> TBAA;
+
+  mutable std::unique_ptr<TargetCodeGenInfo> TheTargetCodeGenInfo;
+
+  // This should not be moved earlier, since its initialization depends on some
+  // of the previous reference members being already initialized and also checks
+  // if TheTargetCodeGenInfo is NULL
+  CodeGenTypes Types;
+
+  /// Holds information about C++ vtables.
+  CodeGenVTables VTables;
+
+  std::unique_ptr<CGObjCRuntime> ObjCRuntime;
+  std::unique_ptr<CGOpenCLRuntime> OpenCLRuntime;
+  std::unique_ptr<CGOpenMPRuntime> OpenMPRuntime;
+  std::unique_ptr<llvm::OpenMPIRBuilder> OMPBuilder;
+  std::unique_ptr<CGCUDARuntime> CUDARuntime;
+  std::unique_ptr<CGDebugInfo> DebugInfo;
+  std::unique_ptr<ObjCEntrypoints> ObjCData;
+  llvm::MDNode *NoObjCARCExceptionsMetadata = nullptr;
+  std::unique_ptr<llvm::IndexedInstrProfReader> PGOReader;
+  InstrProfStats PGOStats;
+  std::unique_ptr<llvm::SanitizerStatReport> SanStats;
+
+  // A set of references that have only been seen via a weakref so far. This is
+  // used to remove the weak of the reference if we ever see a direct reference
+  // or a definition.
+  llvm::SmallPtrSet<llvm::GlobalValue*, 10> WeakRefReferences;
+
+  /// This contains all the decls which have definitions but/ which are deferred
+  /// for emission and therefore should only be output if they are actually
+  /// used. If a decl is in this, then it is known to have not been referenced
+  /// yet.
+  std::map<StringRef, GlobalDecl> DeferredDecls;
+
+  /// This is a list of deferred decls which we have seen that *are* actually
+  /// referenced. These get code generated when the module is done.
+  std::vector<GlobalDecl> DeferredDeclsToEmit;
+  void addDeferredDeclToEmit(GlobalDecl GD) {
+    DeferredDeclsToEmit.emplace_back(GD);
+  }
+
+  /// List of alias we have emitted. Used to make sure that what they point to
+  /// is defined once we get to the end of the of the translation unit.
+  std::vector<GlobalDecl> Aliases;
+
+  /// List of multiversion functions that have to be emitted.  Used to make sure
+  /// we properly emit the iFunc.
+  std::vector<GlobalDecl> MultiVersionFuncs;
+
+  typedef llvm::StringMap<llvm::TrackingVH<llvm::Constant> > ReplacementsTy;
+  ReplacementsTy Replacements;
+
+  /// List of global values to be replaced with something else. Used when we
+  /// want to replace a GlobalValue but can't identify it by its mangled name
+  /// anymore (because the name is already taken).
+  llvm::SmallVector<std::pair<llvm::GlobalValue *, llvm::Constant *>, 8>
+    GlobalValReplacements;
+
+  /// Variables for which we've emitted globals containing their constant
+  /// values along with the corresponding globals, for opportunistic reuse.
+  llvm::DenseMap<const VarDecl*, llvm::GlobalVariable*> InitializerConstants;
+
+  /// Set of global decls for which we already diagnosed mangled name conflict.
+  /// Required to not issue a warning (on a mangling conflict) multiple times
+  /// for the same decl.
+  llvm::DenseSet<GlobalDecl> DiagnosedConflictingDefinitions;
+
+  /// A queue of (optional) vtables to consider emitting.
+  std::vector<const CXXRecordDecl*> DeferredVTables;
+
+  /// A queue of (optional) vtables that may be emitted opportunistically.
+  std::vector<const CXXRecordDecl *> OpportunisticVTables;
+
+  /// List of global values which are required to be present in the object file;
+  /// bitcast to i8*. This is used for forcing visibility of symbols which may
+  /// otherwise be optimized out.
+  std::vector<llvm::WeakTrackingVH> LLVMUsed;
+  std::vector<llvm::WeakTrackingVH> LLVMCompilerUsed;
+
+  /// Store the list of global constructors and their respective priorities to
+  /// be emitted when the translation unit is complete.
+  CtorList GlobalCtors;
+
+  /// Store the list of global destructors and their respective priorities to be
+  /// emitted when the translation unit is complete.
+  CtorList GlobalDtors;
+
+  /// An ordered map of canonical GlobalDecls to their mangled names.
+  llvm::MapVector<GlobalDecl, StringRef> MangledDeclNames;
+  llvm::StringMap<GlobalDecl, llvm::BumpPtrAllocator> Manglings;
+
+  // An ordered map of canonical GlobalDecls paired with the cpu-index for
+  // cpu-specific name manglings.
+  llvm::MapVector<std::pair<GlobalDecl, unsigned>, StringRef>
+      CPUSpecificMangledDeclNames;
+  llvm::StringMap<std::pair<GlobalDecl, unsigned>, llvm::BumpPtrAllocator>
+      CPUSpecificManglings;
+
+  /// Global annotations.
+  std::vector<llvm::Constant*> Annotations;
+
+  /// Map used to get unique annotation strings.
+  llvm::StringMap<llvm::Constant*> AnnotationStrings;
+
+  llvm::StringMap<llvm::GlobalVariable *> CFConstantStringMap;
+
+  llvm::DenseMap<llvm::Constant *, llvm::GlobalVariable *> ConstantStringMap;
+  llvm::DenseMap<const Decl*, llvm::Constant *> StaticLocalDeclMap;
+  llvm::DenseMap<const Decl*, llvm::GlobalVariable*> StaticLocalDeclGuardMap;
+  llvm::DenseMap<const Expr*, llvm::Constant *> MaterializedGlobalTemporaryMap;
+
+  llvm::DenseMap<QualType, llvm::Constant *> AtomicSetterHelperFnMap;
+  llvm::DenseMap<QualType, llvm::Constant *> AtomicGetterHelperFnMap;
+
+  /// Map used to get unique type descriptor constants for sanitizers.
+  llvm::DenseMap<QualType, llvm::Constant *> TypeDescriptorMap;
+
+  /// Map used to track internal linkage functions declared within
+  /// extern "C" regions.
+  typedef llvm::MapVector<IdentifierInfo *,
+                          llvm::GlobalValue *> StaticExternCMap;
+  StaticExternCMap StaticExternCValues;
+
+  /// thread_local variables defined or used in this TU.
+  std::vector<const VarDecl *> CXXThreadLocals;
+
+  /// thread_local variables with initializers that need to run
+  /// before any thread_local variable in this TU is odr-used.
+  std::vector<llvm::Function *> CXXThreadLocalInits;
+  std::vector<const VarDecl *> CXXThreadLocalInitVars;
+
+  /// Global variables with initializers that need to run before main.
+  std::vector<llvm::Function *> CXXGlobalInits;
+
+  /// When a C++ decl with an initializer is deferred, null is
+  /// appended to CXXGlobalInits, and the index of that null is placed
+  /// here so that the initializer will be performed in the correct
+  /// order. Once the decl is emitted, the index is replaced with ~0U to ensure
+  /// that we don't re-emit the initializer.
+  llvm::DenseMap<const Decl*, unsigned> DelayedCXXInitPosition;
+
+  typedef std::pair<OrderGlobalInits, llvm::Function*> GlobalInitData;
+
+  struct GlobalInitPriorityCmp {
+    bool operator()(const GlobalInitData &LHS,
+                    const GlobalInitData &RHS) const {
+      return LHS.first.priority < RHS.first.priority;
+    }
+  };
+
+  /// Global variables with initializers whose order of initialization is set by
+  /// init_priority attribute.
+  SmallVector<GlobalInitData, 8> PrioritizedCXXGlobalInits;
+
+  /// Global destructor functions and arguments that need to run on termination.
+  std::vector<
+      std::tuple<llvm::FunctionType *, llvm::WeakTrackingVH, llvm::Constant *>>
+      CXXGlobalDtors;
+
+  /// The complete set of modules that has been imported.
+  llvm::SetVector<clang::Module *> ImportedModules;
+
+  /// The set of modules for which the module initializers
+  /// have been emitted.
+  llvm::SmallPtrSet<clang::Module *, 16> EmittedModuleInitializers;
+
+  /// A vector of metadata strings for linker options.
+  SmallVector<llvm::MDNode *, 16> LinkerOptionsMetadata;
+
+  /// A vector of metadata strings for dependent libraries for ELF.
+  SmallVector<llvm::MDNode *, 16> ELFDependentLibraries;
+
+  /// @name Cache for Objective-C runtime types
+  /// @{
+
+  /// Cached reference to the class for constant strings. This value has type
+  /// int * but is actually an Obj-C class pointer.
+  llvm::WeakTrackingVH CFConstantStringClassRef;
+
+  /// The type used to describe the state of a fast enumeration in
+  /// Objective-C's for..in loop.
+  QualType ObjCFastEnumerationStateType;
+
+  /// @}
+
+  /// Lazily create the Objective-C runtime
+  void createObjCRuntime();
+
+  void createOpenCLRuntime();
+  void createOpenMPRuntime();
+  void createCUDARuntime();
+
+  bool isTriviallyRecursive(const FunctionDecl *F);
+  bool shouldEmitFunction(GlobalDecl GD);
+  bool shouldOpportunisticallyEmitVTables();
+  /// Map used to be sure we don't emit the same CompoundLiteral twice.
+  llvm::DenseMap<const CompoundLiteralExpr *, llvm::GlobalVariable *>
+      EmittedCompoundLiterals;
+
+  /// Map of the global blocks we've emitted, so that we don't have to re-emit
+  /// them if the constexpr evaluator gets aggressive.
+  llvm::DenseMap<const BlockExpr *, llvm::Constant *> EmittedGlobalBlocks;
+
+  /// @name Cache for Blocks Runtime Globals
+  /// @{
+
+  llvm::Constant *NSConcreteGlobalBlock = nullptr;
+  llvm::Constant *NSConcreteStackBlock = nullptr;
+
+  llvm::FunctionCallee BlockObjectAssign = nullptr;
+  llvm::FunctionCallee BlockObjectDispose = nullptr;
+
+  llvm::Type *BlockDescriptorType = nullptr;
+  llvm::Type *GenericBlockLiteralType = nullptr;
+
+  struct {
+    int GlobalUniqueCount;
+  } Block;
+
+  GlobalDecl initializedGlobalDecl;
+
+  /// @}
+
+  /// void @llvm.lifetime.start(i64 %size, i8* nocapture <ptr>)
+  llvm::Function *LifetimeStartFn = nullptr;
+
+  /// void @llvm.lifetime.end(i64 %size, i8* nocapture <ptr>)
+  llvm::Function *LifetimeEndFn = nullptr;
+
+  std::unique_ptr<SanitizerMetadata> SanitizerMD;
+
+  llvm::MapVector<const Decl *, bool> DeferredEmptyCoverageMappingDecls;
+
+  std::unique_ptr<CoverageMappingModuleGen> CoverageMapping;
+
+  /// Mapping from canonical types to their metadata identifiers. We need to
+  /// maintain this mapping because identifiers may be formed from distinct
+  /// MDNodes.
+  typedef llvm::DenseMap<QualType, llvm::Metadata *> MetadataTypeMap;
+  MetadataTypeMap MetadataIdMap;
+  MetadataTypeMap VirtualMetadataIdMap;
+  MetadataTypeMap GeneralizedMetadataIdMap;
+
+public:
+  CodeGenModule(ASTContext &C, const HeaderSearchOptions &headersearchopts,
+                const PreprocessorOptions &ppopts,
+                const CodeGenOptions &CodeGenOpts, llvm::Module &M,
+                DiagnosticsEngine &Diags,
+                CoverageSourceInfo *CoverageInfo = nullptr);
+
+  ~CodeGenModule();
+
+  void clear();
+
+  /// Finalize LLVM code generation.
+  void Release();
+
+  /// Return true if we should emit location information for expressions.
+  bool getExpressionLocationsEnabled() const;
+
+  /// Return a reference to the configured Objective-C runtime.
+  CGObjCRuntime &getObjCRuntime() {
+    if (!ObjCRuntime) createObjCRuntime();
+    return *ObjCRuntime;
+  }
+
+  /// Return true iff an Objective-C runtime has been configured.
+  bool hasObjCRuntime() { return !!ObjCRuntime; }
+
+  /// Return a reference to the configured OpenCL runtime.
+  CGOpenCLRuntime &getOpenCLRuntime() {
+    assert(OpenCLRuntime != nullptr);
+    return *OpenCLRuntime;
+  }
+
+  /// Return a reference to the configured OpenMP runtime.
+  CGOpenMPRuntime &getOpenMPRuntime() {
+    assert(OpenMPRuntime != nullptr);
+    return *OpenMPRuntime;
+  }
+
+  /// Return a pointer to the configured OpenMPIRBuilder, if any.
+  llvm::OpenMPIRBuilder *getOpenMPIRBuilder() { return OMPBuilder.get(); }
+
+  /// Return a reference to the configured CUDA runtime.
+  CGCUDARuntime &getCUDARuntime() {
+    assert(CUDARuntime != nullptr);
+    return *CUDARuntime;
+  }
+
+  ObjCEntrypoints &getObjCEntrypoints() const {
+    assert(ObjCData != nullptr);
+    return *ObjCData;
+  }
+
+  // Version checking function, used to implement ObjC's @available:
+  // i32 @__isOSVersionAtLeast(i32, i32, i32)
+  llvm::FunctionCallee IsOSVersionAtLeastFn = nullptr;
+
+  InstrProfStats &getPGOStats() { return PGOStats; }
+  llvm::IndexedInstrProfReader *getPGOReader() const { return PGOReader.get(); }
+
+  CoverageMappingModuleGen *getCoverageMapping() const {
+    return CoverageMapping.get();
+  }
+
+  llvm::Constant *getStaticLocalDeclAddress(const VarDecl *D) {
+    return StaticLocalDeclMap[D];
+  }
+  void setStaticLocalDeclAddress(const VarDecl *D,
+                                 llvm::Constant *C) {
+    StaticLocalDeclMap[D] = C;
+  }
+
+  llvm::Constant *
+  getOrCreateStaticVarDecl(const VarDecl &D,
+                           llvm::GlobalValue::LinkageTypes Linkage);
+
+  llvm::GlobalVariable *getStaticLocalDeclGuardAddress(const VarDecl *D) {
+    return StaticLocalDeclGuardMap[D];
+  }
+  void setStaticLocalDeclGuardAddress(const VarDecl *D,
+                                      llvm::GlobalVariable *C) {
+    StaticLocalDeclGuardMap[D] = C;
+  }
+
+  Address createUnnamedGlobalFrom(const VarDecl &D, llvm::Constant *Constant,
+                                  CharUnits Align);
+
+  bool lookupRepresentativeDecl(StringRef MangledName,
+                                GlobalDecl &Result) const;
+
+  llvm::Constant *getAtomicSetterHelperFnMap(QualType Ty) {
+    return AtomicSetterHelperFnMap[Ty];
+  }
+  void setAtomicSetterHelperFnMap(QualType Ty,
+                            llvm::Constant *Fn) {
+    AtomicSetterHelperFnMap[Ty] = Fn;
+  }
+
+  llvm::Constant *getAtomicGetterHelperFnMap(QualType Ty) {
+    return AtomicGetterHelperFnMap[Ty];
+  }
+  void setAtomicGetterHelperFnMap(QualType Ty,
+                            llvm::Constant *Fn) {
+    AtomicGetterHelperFnMap[Ty] = Fn;
+  }
+
+  llvm::Constant *getTypeDescriptorFromMap(QualType Ty) {
+    return TypeDescriptorMap[Ty];
+  }
+  void setTypeDescriptorInMap(QualType Ty, llvm::Constant *C) {
+    TypeDescriptorMap[Ty] = C;
+  }
+
+  CGDebugInfo *getModuleDebugInfo() { return DebugInfo.get(); }
+
+  llvm::MDNode *getNoObjCARCExceptionsMetadata() {
+    if (!NoObjCARCExceptionsMetadata)
+      NoObjCARCExceptionsMetadata = llvm::MDNode::get(getLLVMContext(), None);
+    return NoObjCARCExceptionsMetadata;
+  }
+
+  ASTContext &getContext() const { return Context; }
+  const LangOptions &getLangOpts() const { return LangOpts; }
+  const HeaderSearchOptions &getHeaderSearchOpts()
+    const { return HeaderSearchOpts; }
+  const PreprocessorOptions &getPreprocessorOpts()
+    const { return PreprocessorOpts; }
+  const CodeGenOptions &getCodeGenOpts() const { return CodeGenOpts; }
+  llvm::Module &getModule() const { return TheModule; }
+  DiagnosticsEngine &getDiags() const { return Diags; }
+  const llvm::DataLayout &getDataLayout() const {
+    return TheModule.getDataLayout();
+  }
+  const TargetInfo &getTarget() const { return Target; }
+  const llvm::Triple &getTriple() const { return Target.getTriple(); }
+  bool supportsCOMDAT() const;
+  void maybeSetTrivialComdat(const Decl &D, llvm::GlobalObject &GO);
+
+  CGCXXABI &getCXXABI() const { return *ABI; }
+  llvm::LLVMContext &getLLVMContext() { return VMContext; }
+
+  bool shouldUseTBAA() const { return TBAA != nullptr; }
+
+  const TargetCodeGenInfo &getTargetCodeGenInfo();
+
+  CodeGenTypes &getTypes() { return Types; }
+
+  CodeGenVTables &getVTables() { return VTables; }
+
+  ItaniumVTableContext &getItaniumVTableContext() {
+    return VTables.getItaniumVTableContext();
+  }
+
+  MicrosoftVTableContext &getMicrosoftVTableContext() {
+    return VTables.getMicrosoftVTableContext();
+  }
+
+  CtorList &getGlobalCtors() { return GlobalCtors; }
+  CtorList &getGlobalDtors() { return GlobalDtors; }
+
+  /// getTBAATypeInfo - Get metadata used to describe accesses to objects of
+  /// the given type.
+  llvm::MDNode *getTBAATypeInfo(QualType QTy);
+
+  /// getTBAAAccessInfo - Get TBAA information that describes an access to
+  /// an object of the given type.
+  TBAAAccessInfo getTBAAAccessInfo(QualType AccessType);
+
+  /// getTBAAVTablePtrAccessInfo - Get the TBAA information that describes an
+  /// access to a virtual table pointer.
+  TBAAAccessInfo getTBAAVTablePtrAccessInfo(llvm::Type *VTablePtrType);
+
+  llvm::MDNode *getTBAAStructInfo(QualType QTy);
+
+  /// getTBAABaseTypeInfo - Get metadata that describes the given base access
+  /// type. Return null if the type is not suitable for use in TBAA access tags.
+  llvm::MDNode *getTBAABaseTypeInfo(QualType QTy);
+
+  /// getTBAAAccessTagInfo - Get TBAA tag for a given memory access.
+  llvm::MDNode *getTBAAAccessTagInfo(TBAAAccessInfo Info);
+
+  /// mergeTBAAInfoForCast - Get merged TBAA information for the purposes of
+  /// type casts.
+  TBAAAccessInfo mergeTBAAInfoForCast(TBAAAccessInfo SourceInfo,
+                                      TBAAAccessInfo TargetInfo);
+
+  /// mergeTBAAInfoForConditionalOperator - Get merged TBAA information for the
+  /// purposes of conditional operator.
+  TBAAAccessInfo mergeTBAAInfoForConditionalOperator(TBAAAccessInfo InfoA,
+                                                     TBAAAccessInfo InfoB);
+
+  /// mergeTBAAInfoForMemoryTransfer - Get merged TBAA information for the
+  /// purposes of memory transfer calls.
+  TBAAAccessInfo mergeTBAAInfoForMemoryTransfer(TBAAAccessInfo DestInfo,
+                                                TBAAAccessInfo SrcInfo);
+
+  /// getTBAAInfoForSubobject - Get TBAA information for an access with a given
+  /// base lvalue.
+  TBAAAccessInfo getTBAAInfoForSubobject(LValue Base, QualType AccessType) {
+    if (Base.getTBAAInfo().isMayAlias())
+      return TBAAAccessInfo::getMayAliasInfo();
+    return getTBAAAccessInfo(AccessType);
+  }
+
+  bool isTypeConstant(QualType QTy, bool ExcludeCtorDtor);
+
+  bool isPaddedAtomicType(QualType type);
+  bool isPaddedAtomicType(const AtomicType *type);
+
+  /// DecorateInstructionWithTBAA - Decorate the instruction with a TBAA tag.
+  void DecorateInstructionWithTBAA(llvm::Instruction *Inst,
+                                   TBAAAccessInfo TBAAInfo);
+
+  /// Adds !invariant.barrier !tag to instruction
+  void DecorateInstructionWithInvariantGroup(llvm::Instruction *I,
+                                             const CXXRecordDecl *RD);
+
+  /// Emit the given number of characters as a value of type size_t.
+  llvm::ConstantInt *getSize(CharUnits numChars);
+
+  /// Set the visibility for the given LLVM GlobalValue.
+  void setGlobalVisibility(llvm::GlobalValue *GV, const NamedDecl *D) const;
+
+  void setDSOLocal(llvm::GlobalValue *GV) const;
+
+  void setDLLImportDLLExport(llvm::GlobalValue *GV, GlobalDecl D) const;
+  void setDLLImportDLLExport(llvm::GlobalValue *GV, const NamedDecl *D) const;
+  /// Set visibility, dllimport/dllexport and dso_local.
+  /// This must be called after dllimport/dllexport is set.
+  void setGVProperties(llvm::GlobalValue *GV, GlobalDecl GD) const;
+  void setGVProperties(llvm::GlobalValue *GV, const NamedDecl *D) const;
+
+  void setGVPropertiesAux(llvm::GlobalValue *GV, const NamedDecl *D) const;
+
+  /// Set the TLS mode for the given LLVM GlobalValue for the thread-local
+  /// variable declaration D.
+  void setTLSMode(llvm::GlobalValue *GV, const VarDecl &D) const;
+
+  static llvm::GlobalValue::VisibilityTypes GetLLVMVisibility(Visibility V) {
+    switch (V) {
+    case DefaultVisibility:   return llvm::GlobalValue::DefaultVisibility;
+    case HiddenVisibility:    return llvm::GlobalValue::HiddenVisibility;
+    case ProtectedVisibility: return llvm::GlobalValue::ProtectedVisibility;
+    }
+    llvm_unreachable("unknown visibility!");
+  }
+
+  llvm::Constant *GetAddrOfGlobal(GlobalDecl GD,
+                                  ForDefinition_t IsForDefinition
+                                    = NotForDefinition);
+
+  /// Will return a global variable of the given type. If a variable with a
+  /// different type already exists then a new  variable with the right type
+  /// will be created and all uses of the old variable will be replaced with a
+  /// bitcast to the new variable.
+  llvm::GlobalVariable *
+  CreateOrReplaceCXXRuntimeVariable(StringRef Name, llvm::Type *Ty,
+                                    llvm::GlobalValue::LinkageTypes Linkage,
+                                    unsigned Alignment);
+
+  llvm::Function *
+  CreateGlobalInitOrDestructFunction(llvm::FunctionType *ty, const Twine &name,
+                                     const CGFunctionInfo &FI,
+                                     SourceLocation Loc = SourceLocation(),
+                                     bool TLS = false);
+
+  /// Return the AST address space of the underlying global variable for D, as
+  /// determined by its declaration. Normally this is the same as the address
+  /// space of D's type, but in CUDA, address spaces are associated with
+  /// declarations, not types. If D is nullptr, return the default address
+  /// space for global variable.
+  ///
+  /// For languages without explicit address spaces, if D has default address
+  /// space, target-specific global or constant address space may be returned.
+  LangAS GetGlobalVarAddressSpace(const VarDecl *D);
+
+  /// Return the llvm::Constant for the address of the given global variable.
+  /// If Ty is non-null and if the global doesn't exist, then it will be created
+  /// with the specified type instead of whatever the normal requested type
+  /// would be. If IsForDefinition is true, it is guaranteed that an actual
+  /// global with type Ty will be returned, not conversion of a variable with
+  /// the same mangled name but some other type.
+  llvm::Constant *GetAddrOfGlobalVar(const VarDecl *D,
+                                     llvm::Type *Ty = nullptr,
+                                     ForDefinition_t IsForDefinition
+                                       = NotForDefinition);
+
+  /// Return the AST address space of string literal, which is used to emit
+  /// the string literal as global variable in LLVM IR.
+  /// Note: This is not necessarily the address space of the string literal
+  /// in AST. For address space agnostic language, e.g. C++, string literal
+  /// in AST is always in default address space.
+  LangAS getStringLiteralAddressSpace() const;
+
+  /// Return the address of the given function. If Ty is non-null, then this
+  /// function will use the specified type if it has to create it.
+  llvm::Constant *GetAddrOfFunction(GlobalDecl GD, llvm::Type *Ty = nullptr,
+                                    bool ForVTable = false,
+                                    bool DontDefer = false,
+                                    ForDefinition_t IsForDefinition
+                                      = NotForDefinition);
+
+  /// Get the address of the RTTI descriptor for the given type.
+  llvm::Constant *GetAddrOfRTTIDescriptor(QualType Ty, bool ForEH = false);
+
+  /// Get the address of a uuid descriptor .
+  ConstantAddress GetAddrOfUuidDescriptor(const CXXUuidofExpr* E);
+
+  /// Get the address of the thunk for the given global decl.
+  llvm::Constant *GetAddrOfThunk(StringRef Name, llvm::Type *FnTy,
+                                 GlobalDecl GD);
+
+  /// Get a reference to the target of VD.
+  ConstantAddress GetWeakRefReference(const ValueDecl *VD);
+
+  /// Returns the assumed alignment of an opaque pointer to the given class.
+  CharUnits getClassPointerAlignment(const CXXRecordDecl *CD);
+
+  /// Returns the assumed alignment of a virtual base of a class.
+  CharUnits getVBaseAlignment(CharUnits DerivedAlign,
+                              const CXXRecordDecl *Derived,
+                              const CXXRecordDecl *VBase);
+
+  /// Given a class pointer with an actual known alignment, and the
+  /// expected alignment of an object at a dynamic offset w.r.t that
+  /// pointer, return the alignment to assume at the offset.
+  CharUnits getDynamicOffsetAlignment(CharUnits ActualAlign,
+                                      const CXXRecordDecl *Class,
+                                      CharUnits ExpectedTargetAlign);
+
+  CharUnits
+  computeNonVirtualBaseClassOffset(const CXXRecordDecl *DerivedClass,
+                                   CastExpr::path_const_iterator Start,
+                                   CastExpr::path_const_iterator End);
+
+  /// Returns the offset from a derived class to  a class. Returns null if the
+  /// offset is 0.
+  llvm::Constant *
+  GetNonVirtualBaseClassOffset(const CXXRecordDecl *ClassDecl,
+                               CastExpr::path_const_iterator PathBegin,
+                               CastExpr::path_const_iterator PathEnd);
+
+  llvm::FoldingSet<BlockByrefHelpers> ByrefHelpersCache;
+
+  /// Fetches the global unique block count.
+  int getUniqueBlockCount() { return ++Block.GlobalUniqueCount; }
+
+  /// Fetches the type of a generic block descriptor.
+  llvm::Type *getBlockDescriptorType();
+
+  /// The type of a generic block literal.
+  llvm::Type *getGenericBlockLiteralType();
+
+  /// Gets the address of a block which requires no captures.
+  llvm::Constant *GetAddrOfGlobalBlock(const BlockExpr *BE, StringRef Name);
+
+  /// Returns the address of a block which requires no caputres, or null if
+  /// we've yet to emit the block for BE.
+  llvm::Constant *getAddrOfGlobalBlockIfEmitted(const BlockExpr *BE) {
+    return EmittedGlobalBlocks.lookup(BE);
+  }
+
+  /// Notes that BE's global block is available via Addr. Asserts that BE
+  /// isn't already emitted.
+  void setAddrOfGlobalBlock(const BlockExpr *BE, llvm::Constant *Addr);
+
+  /// Return a pointer to a constant CFString object for the given string.
+  ConstantAddress GetAddrOfConstantCFString(const StringLiteral *Literal);
+
+  /// Return a pointer to a constant NSString object for the given string. Or a
+  /// user defined String object as defined via
+  /// -fconstant-string-class=class_name option.
+  ConstantAddress GetAddrOfConstantString(const StringLiteral *Literal);
+
+  /// Return a constant array for the given string.
+  llvm::Constant *GetConstantArrayFromStringLiteral(const StringLiteral *E);
+
+  /// Return a pointer to a constant array for the given string literal.
+  ConstantAddress
+  GetAddrOfConstantStringFromLiteral(const StringLiteral *S,
+                                     StringRef Name = ".str");
+
+  /// Return a pointer to a constant array for the given ObjCEncodeExpr node.
+  ConstantAddress
+  GetAddrOfConstantStringFromObjCEncode(const ObjCEncodeExpr *);
+
+  /// Returns a pointer to a character array containing the literal and a
+  /// terminating '\0' character. The result has pointer to array type.
+  ///
+  /// \param GlobalName If provided, the name to use for the global (if one is
+  /// created).
+  ConstantAddress
+  GetAddrOfConstantCString(const std::string &Str,
+                           const char *GlobalName = nullptr);
+
+  /// Returns a pointer to a constant global variable for the given file-scope
+  /// compound literal expression.
+  ConstantAddress GetAddrOfConstantCompoundLiteral(const CompoundLiteralExpr*E);
+
+  /// If it's been emitted already, returns the GlobalVariable corresponding to
+  /// a compound literal. Otherwise, returns null.
+  llvm::GlobalVariable *
+  getAddrOfConstantCompoundLiteralIfEmitted(const CompoundLiteralExpr *E);
+
+  /// Notes that CLE's GlobalVariable is GV. Asserts that CLE isn't already
+  /// emitted.
+  void setAddrOfConstantCompoundLiteral(const CompoundLiteralExpr *CLE,
+                                        llvm::GlobalVariable *GV);
+
+  /// Returns a pointer to a global variable representing a temporary
+  /// with static or thread storage duration.
+  ConstantAddress GetAddrOfGlobalTemporary(const MaterializeTemporaryExpr *E,
+                                           const Expr *Inner);
+
+  /// Retrieve the record type that describes the state of an
+  /// Objective-C fast enumeration loop (for..in).
+  QualType getObjCFastEnumerationStateType();
+
+  // Produce code for this constructor/destructor. This method doesn't try
+  // to apply any ABI rules about which other constructors/destructors
+  // are needed or if they are alias to each other.
+  llvm::Function *codegenCXXStructor(GlobalDecl GD);
+
+  /// Return the address of the constructor/destructor of the given type.
+  llvm::Constant *
+  getAddrOfCXXStructor(GlobalDecl GD, const CGFunctionInfo *FnInfo = nullptr,
+                       llvm::FunctionType *FnType = nullptr,
+                       bool DontDefer = false,
+                       ForDefinition_t IsForDefinition = NotForDefinition) {
+    return cast<llvm::Constant>(getAddrAndTypeOfCXXStructor(GD, FnInfo, FnType,
+                                                            DontDefer,
+                                                            IsForDefinition)
+                                    .getCallee());
+  }
+
+  llvm::FunctionCallee getAddrAndTypeOfCXXStructor(
+      GlobalDecl GD, const CGFunctionInfo *FnInfo = nullptr,
+      llvm::FunctionType *FnType = nullptr, bool DontDefer = false,
+      ForDefinition_t IsForDefinition = NotForDefinition);
+
+  /// Given a builtin id for a function like "__builtin_fabsf", return a
+  /// Function* for "fabsf".
+  llvm::Constant *getBuiltinLibFunction(const FunctionDecl *FD,
+                                        unsigned BuiltinID);
+
+  llvm::Function *getIntrinsic(unsigned IID, ArrayRef<llvm::Type*> Tys = None);
+
+  /// Emit code for a single top level declaration.
+  void EmitTopLevelDecl(Decl *D);
+
+  /// Stored a deferred empty coverage mapping for an unused
+  /// and thus uninstrumented top level declaration.
+  void AddDeferredUnusedCoverageMapping(Decl *D);
+
+  /// Remove the deferred empty coverage mapping as this
+  /// declaration is actually instrumented.
+  void ClearUnusedCoverageMapping(const Decl *D);
+
+  /// Emit all the deferred coverage mappings
+  /// for the uninstrumented functions.
+  void EmitDeferredUnusedCoverageMappings();
+
+  /// Tell the consumer that this variable has been instantiated.
+  void HandleCXXStaticMemberVarInstantiation(VarDecl *VD);
+
+  /// If the declaration has internal linkage but is inside an
+  /// extern "C" linkage specification, prepare to emit an alias for it
+  /// to the expected name.
+  template<typename SomeDecl>
+  void MaybeHandleStaticInExternC(const SomeDecl *D, llvm::GlobalValue *GV);
+
+  /// Add a global to a list to be added to the llvm.used metadata.
+  void addUsedGlobal(llvm::GlobalValue *GV);
+
+  /// Add a global to a list to be added to the llvm.compiler.used metadata.
+  void addCompilerUsedGlobal(llvm::GlobalValue *GV);
+
+  /// Add a destructor and object to add to the C++ global destructor function.
+  void AddCXXDtorEntry(llvm::FunctionCallee DtorFn, llvm::Constant *Object) {
+    CXXGlobalDtors.emplace_back(DtorFn.getFunctionType(), DtorFn.getCallee(),
+                                Object);
+  }
+
+  /// Create or return a runtime function declaration with the specified type
+  /// and name. If \p AssumeConvergent is true, the call will have the
+  /// convergent attribute added.
+  llvm::FunctionCallee
+  CreateRuntimeFunction(llvm::FunctionType *Ty, StringRef Name,
+                        llvm::AttributeList ExtraAttrs = llvm::AttributeList(),
+                        bool Local = false, bool AssumeConvergent = false);
+
+  /// Create or return a runtime function declaration with the specified type
+  /// and name. This will automatically add the convergent attribute to the
+  /// function declaration.
+  llvm::FunctionCallee CreateConvergentRuntimeFunction(
+      llvm::FunctionType *Ty, StringRef Name,
+      llvm::AttributeList ExtraAttrs = llvm::AttributeList(),
+      bool Local = false) {
+    return CreateRuntimeFunction(Ty, Name, ExtraAttrs, Local, true);
+  }
+
+  /// Create a new runtime global variable with the specified type and name.
+  llvm::Constant *CreateRuntimeVariable(llvm::Type *Ty,
+                                        StringRef Name);
+
+  ///@name Custom Blocks Runtime Interfaces
+  ///@{
+
+  llvm::Constant *getNSConcreteGlobalBlock();
+  llvm::Constant *getNSConcreteStackBlock();
+  llvm::FunctionCallee getBlockObjectAssign();
+  llvm::FunctionCallee getBlockObjectDispose();
+
+  ///@}
+
+  llvm::Function *getLLVMLifetimeStartFn();
+  llvm::Function *getLLVMLifetimeEndFn();
+
+  // Make sure that this type is translated.
+  void UpdateCompletedType(const TagDecl *TD);
+
+  llvm::Constant *getMemberPointerConstant(const UnaryOperator *e);
+
+  /// Emit type info if type of an expression is a variably modified
+  /// type. Also emit proper debug info for cast types.
+  void EmitExplicitCastExprType(const ExplicitCastExpr *E,
+                                CodeGenFunction *CGF = nullptr);
+
+  /// Return the result of value-initializing the given type, i.e. a null
+  /// expression of the given type.  This is usually, but not always, an LLVM
+  /// null constant.
+  llvm::Constant *EmitNullConstant(QualType T);
+
+  /// Return a null constant appropriate for zero-initializing a base class with
+  /// the given type. This is usually, but not always, an LLVM null constant.
+  llvm::Constant *EmitNullConstantForBase(const CXXRecordDecl *Record);
+
+  /// Emit a general error that something can't be done.
+  void Error(SourceLocation loc, StringRef error);
+
+  /// Print out an error that codegen doesn't support the specified stmt yet.
+  void ErrorUnsupported(const Stmt *S, const char *Type);
+
+  /// Print out an error that codegen doesn't support the specified decl yet.
+  void ErrorUnsupported(const Decl *D, const char *Type);
+
+  /// Set the attributes on the LLVM function for the given decl and function
+  /// info. This applies attributes necessary for handling the ABI as well as
+  /// user specified attributes like section.
+  void SetInternalFunctionAttributes(GlobalDecl GD, llvm::Function *F,
+                                     const CGFunctionInfo &FI);
+
+  /// Set the LLVM function attributes (sext, zext, etc).
+  void SetLLVMFunctionAttributes(GlobalDecl GD, const CGFunctionInfo &Info,
+                                 llvm::Function *F);
+
+  /// Set the LLVM function attributes which only apply to a function
+  /// definition.
+  void SetLLVMFunctionAttributesForDefinition(const Decl *D, llvm::Function *F);
+
+  /// Return true iff the given type uses 'sret' when used as a return type.
+  bool ReturnTypeUsesSRet(const CGFunctionInfo &FI);
+
+  /// Return true iff the given type uses an argument slot when 'sret' is used
+  /// as a return type.
+  bool ReturnSlotInterferesWithArgs(const CGFunctionInfo &FI);
+
+  /// Return true iff the given type uses 'fpret' when used as a return type.
+  bool ReturnTypeUsesFPRet(QualType ResultType);
+
+  /// Return true iff the given type uses 'fp2ret' when used as a return type.
+  bool ReturnTypeUsesFP2Ret(QualType ResultType);
+
+  /// Get the LLVM attributes and calling convention to use for a particular
+  /// function type.
+  ///
+  /// \param Name - The function name.
+  /// \param Info - The function type information.
+  /// \param CalleeInfo - The callee information these attributes are being
+  /// constructed for. If valid, the attributes applied to this decl may
+  /// contribute to the function attributes and calling convention.
+  /// \param Attrs [out] - On return, the attribute list to use.
+  /// \param CallingConv [out] - On return, the LLVM calling convention to use.
+  void ConstructAttributeList(StringRef Name, const CGFunctionInfo &Info,
+                              CGCalleeInfo CalleeInfo,
+                              llvm::AttributeList &Attrs, unsigned &CallingConv,
+                              bool AttrOnCallSite);
+
+  /// Adds attributes to F according to our CodeGenOptions and LangOptions, as
+  /// though we had emitted it ourselves.  We remove any attributes on F that
+  /// conflict with the attributes we add here.
+  ///
+  /// This is useful for adding attrs to bitcode modules that you want to link
+  /// with but don't control, such as CUDA's libdevice.  When linking with such
+  /// a bitcode library, you might want to set e.g. its functions'
+  /// "unsafe-fp-math" attribute to match the attr of the functions you're
+  /// codegen'ing.  Otherwise, LLVM will interpret the bitcode module's lack of
+  /// unsafe-fp-math attrs as tantamount to unsafe-fp-math=false, and then LLVM
+  /// will propagate unsafe-fp-math=false up to every transitive caller of a
+  /// function in the bitcode library!
+  ///
+  /// With the exception of fast-math attrs, this will only make the attributes
+  /// on the function more conservative.  But it's unsafe to call this on a
+  /// function which relies on particular fast-math attributes for correctness.
+  /// It's up to you to ensure that this is safe.
+  void AddDefaultFnAttrs(llvm::Function &F);
+
+  StringRef getMangledName(GlobalDecl GD);
+  StringRef getBlockMangledName(GlobalDecl GD, const BlockDecl *BD);
+
+  void EmitTentativeDefinition(const VarDecl *D);
+
+  void EmitExternalDeclaration(const VarDecl *D);
+
+  void EmitVTable(CXXRecordDecl *Class);
+
+  void RefreshTypeCacheForClass(const CXXRecordDecl *Class);
+
+  /// Appends Opts to the "llvm.linker.options" metadata value.
+  void AppendLinkerOptions(StringRef Opts);
+
+  /// Appends a detect mismatch command to the linker options.
+  void AddDetectMismatch(StringRef Name, StringRef Value);
+
+  /// Appends a dependent lib to the appropriate metadata value.
+  void AddDependentLib(StringRef Lib);
+
+
+  llvm::GlobalVariable::LinkageTypes getFunctionLinkage(GlobalDecl GD);
+
+  void setFunctionLinkage(GlobalDecl GD, llvm::Function *F) {
+    F->setLinkage(getFunctionLinkage(GD));
+  }
+
+  /// Return the appropriate linkage for the vtable, VTT, and type information
+  /// of the given class.
+  llvm::GlobalVariable::LinkageTypes getVTableLinkage(const CXXRecordDecl *RD);
+
+  /// Return the store size, in character units, of the given LLVM type.
+  CharUnits GetTargetTypeStoreSize(llvm::Type *Ty) const;
+
+  /// Returns LLVM linkage for a declarator.
+  llvm::GlobalValue::LinkageTypes
+  getLLVMLinkageForDeclarator(const DeclaratorDecl *D, GVALinkage Linkage,
+                              bool IsConstantVariable);
+
+  /// Returns LLVM linkage for a declarator.
+  llvm::GlobalValue::LinkageTypes
+  getLLVMLinkageVarDefinition(const VarDecl *VD, bool IsConstant);
+
+  /// Emit all the global annotations.
+  void EmitGlobalAnnotations();
+
+  /// Emit an annotation string.
+  llvm::Constant *EmitAnnotationString(StringRef Str);
+
+  /// Emit the annotation's translation unit.
+  llvm::Constant *EmitAnnotationUnit(SourceLocation Loc);
+
+  /// Emit the annotation line number.
+  llvm::Constant *EmitAnnotationLineNo(SourceLocation L);
+
+  /// Generate the llvm::ConstantStruct which contains the annotation
+  /// information for a given GlobalValue. The annotation struct is
+  /// {i8 *, i8 *, i8 *, i32}. The first field is a constant expression, the
+  /// GlobalValue being annotated. The second field is the constant string
+  /// created from the AnnotateAttr's annotation. The third field is a constant
+  /// string containing the name of the translation unit. The fourth field is
+  /// the line number in the file of the annotated value declaration.
+  llvm::Constant *EmitAnnotateAttr(llvm::GlobalValue *GV,
+                                   const AnnotateAttr *AA,
+                                   SourceLocation L);
+
+  /// Add global annotations that are set on D, for the global GV. Those
+  /// annotations are emitted during finalization of the LLVM code.
+  void AddGlobalAnnotations(const ValueDecl *D, llvm::GlobalValue *GV);
+
+  bool isInSanitizerBlacklist(SanitizerMask Kind, llvm::Function *Fn,
+                              SourceLocation Loc) const;
+
+  bool isInSanitizerBlacklist(llvm::GlobalVariable *GV, SourceLocation Loc,
+                              QualType Ty,
+                              StringRef Category = StringRef()) const;
+
+  /// Imbue XRay attributes to a function, applying the always/never attribute
+  /// lists in the process. Returns true if we did imbue attributes this way,
+  /// false otherwise.
+  bool imbueXRayAttrs(llvm::Function *Fn, SourceLocation Loc,
+                      StringRef Category = StringRef()) const;
+
+  SanitizerMetadata *getSanitizerMetadata() {
+    return SanitizerMD.get();
+  }
+
+  void addDeferredVTable(const CXXRecordDecl *RD) {
+    DeferredVTables.push_back(RD);
+  }
+
+  /// Emit code for a single global function or var decl. Forward declarations
+  /// are emitted lazily.
+  void EmitGlobal(GlobalDecl D);
+
+  bool TryEmitBaseDestructorAsAlias(const CXXDestructorDecl *D);
+
+  llvm::GlobalValue *GetGlobalValue(StringRef Ref);
+
+  /// Set attributes which are common to any form of a global definition (alias,
+  /// Objective-C method, function, global variable).
+  ///
+  /// NOTE: This should only be called for definitions.
+  void SetCommonAttributes(GlobalDecl GD, llvm::GlobalValue *GV);
+
+  void addReplacement(StringRef Name, llvm::Constant *C);
+
+  void addGlobalValReplacement(llvm::GlobalValue *GV, llvm::Constant *C);
+
+  /// Emit a code for threadprivate directive.
+  /// \param D Threadprivate declaration.
+  void EmitOMPThreadPrivateDecl(const OMPThreadPrivateDecl *D);
+
+  /// Emit a code for declare reduction construct.
+  void EmitOMPDeclareReduction(const OMPDeclareReductionDecl *D,
+                               CodeGenFunction *CGF = nullptr);
+
+  /// Emit a code for declare mapper construct.
+  void EmitOMPDeclareMapper(const OMPDeclareMapperDecl *D,
+                            CodeGenFunction *CGF = nullptr);
+
+  /// Emit a code for requires directive.
+  /// \param D Requires declaration
+  void EmitOMPRequiresDecl(const OMPRequiresDecl *D);
+
+  /// Emits the definition of \p OldGD function with body from \p NewGD.
+  /// Required for proper handling of declare variant directive on the GPU.
+  void emitOpenMPDeviceFunctionRedefinition(GlobalDecl OldGD, GlobalDecl NewGD,
+                                            llvm::GlobalValue *GV);
+
+  /// Returns whether the given record has hidden LTO visibility and therefore
+  /// may participate in (single-module) CFI and whole-program vtable
+  /// optimization.
+  bool HasHiddenLTOVisibility(const CXXRecordDecl *RD);
+
+  /// Returns the vcall visibility of the given type. This is the scope in which
+  /// a virtual function call could be made which ends up being dispatched to a
+  /// member function of this class. This scope can be wider than the visibility
+  /// of the class itself when the class has a more-visible dynamic base class.
+  llvm::GlobalObject::VCallVisibility
+  GetVCallVisibilityLevel(const CXXRecordDecl *RD);
+
+  /// Emit type metadata for the given vtable using the given layout.
+  void EmitVTableTypeMetadata(const CXXRecordDecl *RD,
+                              llvm::GlobalVariable *VTable,
+                              const VTableLayout &VTLayout);
+
+  /// Generate a cross-DSO type identifier for MD.
+  llvm::ConstantInt *CreateCrossDsoCfiTypeId(llvm::Metadata *MD);
+
+  /// Create a metadata identifier for the given type. This may either be an
+  /// MDString (for external identifiers) or a distinct unnamed MDNode (for
+  /// internal identifiers).
+  llvm::Metadata *CreateMetadataIdentifierForType(QualType T);
+
+  /// Create a metadata identifier that is intended to be used to check virtual
+  /// calls via a member function pointer.
+  llvm::Metadata *CreateMetadataIdentifierForVirtualMemPtrType(QualType T);
+
+  /// Create a metadata identifier for the generalization of the given type.
+  /// This may either be an MDString (for external identifiers) or a distinct
+  /// unnamed MDNode (for internal identifiers).
+  llvm::Metadata *CreateMetadataIdentifierGeneralized(QualType T);
+
+  /// Create and attach type metadata to the given function.
+  void CreateFunctionTypeMetadataForIcall(const FunctionDecl *FD,
+                                          llvm::Function *F);
+
+  /// Returns whether this module needs the "all-vtables" type identifier.
+  bool NeedAllVtablesTypeId() const;
+
+  /// Create and attach type metadata for the given vtable.
+  void AddVTableTypeMetadata(llvm::GlobalVariable *VTable, CharUnits Offset,
+                             const CXXRecordDecl *RD);
+
+  /// Return a vector of most-base classes for RD. This is used to implement
+  /// control flow integrity checks for member function pointers.
+  ///
+  /// A most-base class of a class C is defined as a recursive base class of C,
+  /// including C itself, that does not have any bases.
+  std::vector<const CXXRecordDecl *>
+  getMostBaseClasses(const CXXRecordDecl *RD);
+
+  /// Get the declaration of std::terminate for the platform.
+  llvm::FunctionCallee getTerminateFn();
+
+  llvm::SanitizerStatReport &getSanStats();
+
+  llvm::Value *
+  createOpenCLIntToSamplerConversion(const Expr *E, CodeGenFunction &CGF);
+
+  /// OpenCL v1.2 s5.6.4.6 allows the compiler to store kernel argument
+  /// information in the program executable. The argument information stored
+  /// includes the argument name, its type, the address and access qualifiers
+  /// used. This helper can be used to generate metadata for source code kernel
+  /// function as well as generated implicitly kernels. If a kernel is generated
+  /// implicitly null value has to be passed to the last two parameters,
+  /// otherwise all parameters must have valid non-null values.
+  /// \param FN is a pointer to IR function being generated.
+  /// \param FD is a pointer to function declaration if any.
+  /// \param CGF is a pointer to CodeGenFunction that generates this function.
+  void GenOpenCLArgMetadata(llvm::Function *FN,
+                            const FunctionDecl *FD = nullptr,
+                            CodeGenFunction *CGF = nullptr);
+
+  /// Get target specific null pointer.
+  /// \param T is the LLVM type of the null pointer.
+  /// \param QT is the clang QualType of the null pointer.
+  llvm::Constant *getNullPointer(llvm::PointerType *T, QualType QT);
+
+private:
+  llvm::Constant *GetOrCreateLLVMFunction(
+      StringRef MangledName, llvm::Type *Ty, GlobalDecl D, bool ForVTable,
+      bool DontDefer = false, bool IsThunk = false,
+      llvm::AttributeList ExtraAttrs = llvm::AttributeList(),
+      ForDefinition_t IsForDefinition = NotForDefinition);
+
+  llvm::Constant *GetOrCreateMultiVersionResolver(GlobalDecl GD,
+                                                  llvm::Type *DeclTy,
+                                                  const FunctionDecl *FD);
+  void UpdateMultiVersionNames(GlobalDecl GD, const FunctionDecl *FD);
+
+  llvm::Constant *GetOrCreateLLVMGlobal(StringRef MangledName,
+                                        llvm::PointerType *PTy,
+                                        const VarDecl *D,
+                                        ForDefinition_t IsForDefinition
+                                          = NotForDefinition);
+
+  bool GetCPUAndFeaturesAttributes(GlobalDecl GD,
+                                   llvm::AttrBuilder &AttrBuilder);
+  void setNonAliasAttributes(GlobalDecl GD, llvm::GlobalObject *GO);
+
+  /// Set function attributes for a function declaration.
+  void SetFunctionAttributes(GlobalDecl GD, llvm::Function *F,
+                             bool IsIncompleteFunction, bool IsThunk);
+
+  void EmitGlobalDefinition(GlobalDecl D, llvm::GlobalValue *GV = nullptr);
+
+  void EmitGlobalFunctionDefinition(GlobalDecl GD, llvm::GlobalValue *GV);
+  void EmitMultiVersionFunctionDefinition(GlobalDecl GD, llvm::GlobalValue *GV);
+
+  void EmitGlobalVarDefinition(const VarDecl *D, bool IsTentative = false);
+  void EmitExternalVarDeclaration(const VarDecl *D);
+  void EmitAliasDefinition(GlobalDecl GD);
+  void emitIFuncDefinition(GlobalDecl GD);
+  void emitCPUDispatchDefinition(GlobalDecl GD);
+  void EmitObjCPropertyImplementations(const ObjCImplementationDecl *D);
+  void EmitObjCIvarInitializations(ObjCImplementationDecl *D);
+
+  // C++ related functions.
+
+  void EmitDeclContext(const DeclContext *DC);
+  void EmitLinkageSpec(const LinkageSpecDecl *D);
+
+  /// Emit the function that initializes C++ thread_local variables.
+  void EmitCXXThreadLocalInitFunc();
+
+  /// Emit the function that initializes C++ globals.
+  void EmitCXXGlobalInitFunc();
+
+  /// Emit the function that destroys C++ globals.
+  void EmitCXXGlobalDtorFunc();
+
+  /// Emit the function that initializes the specified global (if PerformInit is
+  /// true) and registers its destructor.
+  void EmitCXXGlobalVarDeclInitFunc(const VarDecl *D,
+                                    llvm::GlobalVariable *Addr,
+                                    bool PerformInit);
+
+  void EmitPointerToInitFunc(const VarDecl *VD, llvm::GlobalVariable *Addr,
+                             llvm::Function *InitFunc, InitSegAttr *ISA);
+
+  // FIXME: Hardcoding priority here is gross.
+  void AddGlobalCtor(llvm::Function *Ctor, int Priority = 65535,
+                     llvm::Constant *AssociatedData = nullptr);
+  void AddGlobalDtor(llvm::Function *Dtor, int Priority = 65535);
+
+  /// EmitCtorList - Generates a global array of functions and priorities using
+  /// the given list and name. This array will have appending linkage and is
+  /// suitable for use as a LLVM constructor or destructor array. Clears Fns.
+  void EmitCtorList(CtorList &Fns, const char *GlobalName);
+
+  /// Emit any needed decls for which code generation was deferred.
+  void EmitDeferred();
+
+  /// Try to emit external vtables as available_externally if they have emitted
+  /// all inlined virtual functions.  It runs after EmitDeferred() and therefore
+  /// is not allowed to create new references to things that need to be emitted
+  /// lazily.
+  void EmitVTablesOpportunistically();
+
+  /// Call replaceAllUsesWith on all pairs in Replacements.
+  void applyReplacements();
+
+  /// Call replaceAllUsesWith on all pairs in GlobalValReplacements.
+  void applyGlobalValReplacements();
+
+  void checkAliases();
+
+  std::map<int, llvm::TinyPtrVector<llvm::Function *>> DtorsUsingAtExit;
+
+  /// Register functions annotated with __attribute__((destructor)) using
+  /// __cxa_atexit, if it is available, or atexit otherwise.
+  void registerGlobalDtorsWithAtExit();
+
+  void emitMultiVersionFunctions();
+
+  /// Emit any vtables which we deferred and still have a use for.
+  void EmitDeferredVTables();
+
+  /// Emit a dummy function that reference a CoreFoundation symbol when
+  /// @available is used on Darwin.
+  void emitAtAvailableLinkGuard();
+
+  /// Emit the llvm.used and llvm.compiler.used metadata.
+  void emitLLVMUsed();
+
+  /// Emit the link options introduced by imported modules.
+  void EmitModuleLinkOptions();
+
+  /// Emit aliases for internal-linkage declarations inside "C" language
+  /// linkage specifications, giving them the "expected" name where possible.
+  void EmitStaticExternCAliases();
+
+  void EmitDeclMetadata();
+
+  /// Emit the Clang version as llvm.ident metadata.
+  void EmitVersionIdentMetadata();
+
+  /// Emit the Clang commandline as llvm.commandline metadata.
+  void EmitCommandLineMetadata();
+
+  /// Emits target specific Metadata for global declarations.
+  void EmitTargetMetadata();
+
+  /// Emits OpenCL specific Metadata e.g. OpenCL version.
+  void EmitOpenCLMetadata();
+
+  /// Emit the llvm.gcov metadata used to tell LLVM where to emit the .gcno and
+  /// .gcda files in a way that persists in .bc files.
+  void EmitCoverageFile();
+
+  /// Emits the initializer for a uuidof string.
+  llvm::Constant *EmitUuidofInitializer(StringRef uuidstr);
+
+  /// Determine whether the definition must be emitted; if this returns \c
+  /// false, the definition can be emitted lazily if it's used.
+  bool MustBeEmitted(const ValueDecl *D);
+
+  /// Determine whether the definition can be emitted eagerly, or should be
+  /// delayed until the end of the translation unit. This is relevant for
+  /// definitions whose linkage can change, e.g. implicit function instantions
+  /// which may later be explicitly instantiated.
+  bool MayBeEmittedEagerly(const ValueDecl *D);
+
+  /// Check whether we can use a "simpler", more core exceptions personality
+  /// function.
+  void SimplifyPersonality();
+
+  /// Helper function for ConstructAttributeList and AddDefaultFnAttrs.
+  /// Constructs an AttrList for a function with the given properties.
+  void ConstructDefaultFnAttrList(StringRef Name, bool HasOptnone,
+                                  bool AttrOnCallSite,
+                                  llvm::AttrBuilder &FuncAttrs);
+
+  llvm::Metadata *CreateMetadataIdentifierImpl(QualType T, MetadataTypeMap &Map,
+                                               StringRef Suffix);
+};
+
+}  // end namespace CodeGen
+}  // end namespace clang
+
+#endif // LLVM_CLANG_LIB_CODEGEN_CODEGENMODULE_H