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//===-------- llvm/GlobalAlias.h - GlobalAlias 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
//
//===----------------------------------------------------------------------===//
//
// This file contains the declaration of the GlobalAlias class, which
// represents a single function or variable alias in the IR.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_IR_GLOBALALIAS_H
#define LLVM_IR_GLOBALALIAS_H
#include "llvm/ADT/ilist_node.h"
#include "llvm/IR/GlobalValue.h"
#include "llvm/IR/OperandTraits.h"
#include "llvm/IR/Value.h"
namespace llvm {
class Twine;
class Module;
template <typename ValueSubClass, typename... Args> class SymbolTableListTraits;
class GlobalAlias : public GlobalValue, public ilist_node<GlobalAlias> {
friend class SymbolTableListTraits<GlobalAlias>;
GlobalAlias(Type *Ty, unsigned AddressSpace, LinkageTypes Linkage,
const Twine &Name, Constant *Aliasee, Module *Parent);
public:
GlobalAlias(const GlobalAlias &) = delete;
GlobalAlias &operator=(const GlobalAlias &) = delete;
/// If a parent module is specified, the alias is automatically inserted into
/// the end of the specified module's alias list.
static GlobalAlias *create(Type *Ty, unsigned AddressSpace,
LinkageTypes Linkage, const Twine &Name,
Constant *Aliasee, Module *Parent);
// Without the Aliasee.
static GlobalAlias *create(Type *Ty, unsigned AddressSpace,
LinkageTypes Linkage, const Twine &Name,
Module *Parent);
// The module is taken from the Aliasee.
static GlobalAlias *create(Type *Ty, unsigned AddressSpace,
LinkageTypes Linkage, const Twine &Name,
GlobalValue *Aliasee);
// Type, Parent and AddressSpace taken from the Aliasee.
static GlobalAlias *create(LinkageTypes Linkage, const Twine &Name,
GlobalValue *Aliasee);
// Linkage, Type, Parent and AddressSpace taken from the Aliasee.
static GlobalAlias *create(const Twine &Name, GlobalValue *Aliasee);
// 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 GlobalAlias *Src) {
GlobalValue::copyAttributesFrom(Src);
}
/// removeFromParent - This method unlinks 'this' from the containing module,
/// but does not delete it.
///
void removeFromParent();
/// eraseFromParent - This method unlinks 'this' from the containing module
/// and deletes it.
///
void eraseFromParent();
/// These methods retrieve and set alias target.
void setAliasee(Constant *Aliasee);
const Constant *getAliasee() const {
return static_cast<Constant *>(Op<0>().get());
}
Constant *getAliasee() { return static_cast<Constant *>(Op<0>().get()); }
const GlobalObject *getAliaseeObject() const;
GlobalObject *getAliaseeObject() {
return const_cast<GlobalObject *>(
static_cast<const GlobalAlias *>(this)->getAliaseeObject());
}
static bool isValidLinkage(LinkageTypes L) {
return isExternalLinkage(L) || isLocalLinkage(L) || isWeakLinkage(L) ||
isLinkOnceLinkage(L) || isAvailableExternallyLinkage(L);
}
// Methods for support type inquiry through isa, cast, and dyn_cast:
static bool classof(const Value *V) {
return V->getValueID() == Value::GlobalAliasVal;
}
};
template <>
struct OperandTraits<GlobalAlias>
: public FixedNumOperandTraits<GlobalAlias, 1> {};
DEFINE_TRANSPARENT_OPERAND_ACCESSORS(GlobalAlias, Constant)
} // end namespace llvm
#endif // LLVM_IR_GLOBALALIAS_H
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