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//===--- CodeGenModule.h - Per-Module state for LLVM CodeGen ----*- C++ -*-===//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
// This is the internal per-translation-unit state used for llvm translation.
#include "CGVTables.h"
#include "CodeGenTypeCache.h"
#include "CodeGenTypes.h"
#include "SanitizerMetadata.h"
#include "clang/AST/Attr.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 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;
namespace CodeGen {
class CallArgList;
class CodeGenFunction;
class CodeGenTBAA;
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;
: 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)
/// Record that a function we've visited has no profile data.
void addMissing(bool MainFile) {
if (MainFile)
/// 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.
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 {
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;
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;
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<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) {
/// 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>
/// 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>
llvm::StringMap<std::pair<GlobalDecl, unsigned>, llvm::BumpPtrAllocator>
/// 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::tuple<llvm::FunctionType *, llvm::WeakTrackingVH, llvm::Constant *>>
/// 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 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 *>
/// 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;
/// 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;
GlobalDecl initializedGlobalDecl;
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;
CodeGenModule(ASTContext &C, const HeaderSearchOptions &headersearchopts,
const PreprocessorOptions &ppopts,
const CodeGenOptions &CodeGenOpts, llvm::Module &M,
DiagnosticsEngine &Diags,
CoverageSourceInfo *CoverageInfo = nullptr);
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 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);
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.
GetAddrOfConstantStringFromLiteral(const StringLiteral *S,
StringRef Name = ".str");
/// Return a pointer to a constant array for the given ObjCEncodeExpr node.
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).
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 (
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,
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(),
/// Create or return a runtime function declaration with the specified type
/// and name.
CreateRuntimeFunction(llvm::FunctionType *Ty, StringRef Name,
llvm::AttributeList ExtraAttrs = llvm::AttributeList(),
bool Local = false);
/// 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);
/// Parses the target attributes passed in, and returns only the ones that are
/// valid feature names.
TargetAttr::ParsedTargetAttr filterFunctionTargetAttrs(const TargetAttr *TD);
// Fills in the supplied string map with the set of target features for the
// passed in function.
void getFunctionFeatureMap(llvm::StringMap<bool> &FeatureMap, GlobalDecl GD);
StringRef getMangledName(GlobalDecl GD);
StringRef getBlockMangledName(GlobalDecl GD, const BlockDecl *BD);
void EmitTentativeDefinition(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) {
/// 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.
getLLVMLinkageForDeclarator(const DeclaratorDecl *D, GVALinkage Linkage,
bool IsConstantVariable);
/// Returns LLVM linkage for a declarator.
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) {
/// 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);
/// Emit type metadata for the given vtable using the given layout.
void EmitVTableTypeMetadata(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);
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 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