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//===-------- llvm/GlobalIFunc.h - GlobalIFunc class ------------*- 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
/// \brief
/// This file contains the declaration of the GlobalIFunc class, which
/// represents a single indirect function in the IR. Indirect function uses
/// ELF symbol type extension to mark that the address of a declaration should
/// be resolved at runtime by calling a resolver function.
#include "llvm/ADT/ilist_node.h"
#include "llvm/IR/GlobalIndirectSymbol.h"
#include "llvm/IR/Value.h"
namespace llvm {
class Twine;
class Module;
// Traits class for using GlobalIFunc in symbol table in Module.
template <typename ValueSubClass> class SymbolTableListTraits;
class GlobalIFunc final : public GlobalIndirectSymbol,
public ilist_node<GlobalIFunc> {
friend class SymbolTableListTraits<GlobalIFunc>;
GlobalIFunc(Type *Ty, unsigned AddressSpace, LinkageTypes Linkage,
const Twine &Name, Constant *Resolver, Module *Parent);
GlobalIFunc(const GlobalIFunc &) = delete;
GlobalIFunc &operator=(const GlobalIFunc &) = delete;
/// If a parent module is specified, the ifunc is automatically inserted into
/// the end of the specified module's ifunc list.
static GlobalIFunc *create(Type *Ty, unsigned AddressSpace,
LinkageTypes Linkage, const Twine &Name,
Constant *Resolver, Module *Parent);
void copyAttributesFrom(const GlobalIFunc *Src) {
/// This method unlinks 'this' from the containing module, but does not
/// delete it.
void removeFromParent();
/// This method unlinks 'this' from the containing module and deletes it.
void eraseFromParent();
/// These methods retrieve and set ifunc resolver function.
void setResolver(Constant *Resolver) {
const Constant *getResolver() const {
return getIndirectSymbol();
Constant *getResolver() {
return getIndirectSymbol();
// Methods for support type inquiry through isa, cast, and dyn_cast:
static bool classof(const Value *V) {
return V->getValueID() == Value::GlobalIFuncVal;
} // end namespace llvm