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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 https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
///
/// \file
/// 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.
///
//===----------------------------------------------------------------------===//
#ifndef LLVM_IR_GLOBALIFUNC_H
#define LLVM_IR_GLOBALIFUNC_H
#include "llvm/ADT/ilist_node.h"
#include "llvm/IR/Constant.h"
#include "llvm/IR/GlobalObject.h"
#include "llvm/IR/OperandTraits.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, typename... Args> class SymbolTableListTraits;
class GlobalIFunc final : public GlobalObject, public ilist_node<GlobalIFunc> {
friend class SymbolTableListTraits<GlobalIFunc>;
GlobalIFunc(Type *Ty, unsigned AddressSpace, LinkageTypes Linkage,
const Twine &Name, Constant *Resolver, Module *Parent);
public:
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);
// allocate space for exactly one operand
void *operator new(size_t S) { return User::operator new(S, 1); }
void operator delete(void *Ptr) { User::operator delete(Ptr); }
/// Provide fast operand accessors
DECLARE_TRANSPARENT_OPERAND_ACCESSORS(Constant);
void copyAttributesFrom(const GlobalIFunc *Src) {
GlobalObject::copyAttributesFrom(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) { Op<0>().set(Resolver); }
const Constant *getResolver() const {
return static_cast<Constant *>(Op<0>().get());
}
Constant *getResolver() { return static_cast<Constant *>(Op<0>().get()); }
// Return the resolver function after peeling off potential ConstantExpr
// indirection.
const Function *getResolverFunction() const;
Function *getResolverFunction() {
return const_cast<Function *>(
static_cast<const GlobalIFunc *>(this)->getResolverFunction());
}
static FunctionType *getResolverFunctionType(Type *IFuncValTy) {
return FunctionType::get(IFuncValTy->getPointerTo(), false);
}
static bool isValidLinkage(LinkageTypes L) {
return isExternalLinkage(L) || isLocalLinkage(L) || isWeakLinkage(L) ||
isLinkOnceLinkage(L);
}
// Methods for support type inquiry through isa, cast, and dyn_cast:
static bool classof(const Value *V) {
return V->getValueID() == Value::GlobalIFuncVal;
}
// Apply specific operation to all resolver-related values. If resolver target
// is already a global object, then apply the operation to it directly. If
// target is a GlobalExpr or a GlobalAlias, evaluate it to its base object and
// apply the operation for the base object and all aliases along the path.
void applyAlongResolverPath(function_ref<void(const GlobalValue &)> Op) const;
};
template <>
struct OperandTraits<GlobalIFunc>
: public FixedNumOperandTraits<GlobalIFunc, 1> {};
DEFINE_TRANSPARENT_OPERAND_ACCESSORS(GlobalIFunc, Constant)
} // end namespace llvm
#endif // LLVM_IR_GLOBALIFUNC_H
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