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//===-------- llvm/GlobalAlias.h - GlobalAlias class ------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// 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/Twine.h"
#include "llvm/ADT/ilist_node.h"
#include "llvm/IR/GlobalValue.h"
#include "llvm/IR/OperandTraits.h"
namespace llvm {
class Module;
template<typename ValueSubClass, typename ItemParentClass>
class SymbolTableListTraits;
class GlobalAlias : public GlobalValue, public ilist_node<GlobalAlias> {
friend class SymbolTableListTraits<GlobalAlias, Module>;
void operator=(const GlobalAlias &) LLVM_DELETED_FUNCTION;
GlobalAlias(const GlobalAlias &) LLVM_DELETED_FUNCTION;
void setParent(Module *parent);
GlobalAlias(Type *Ty, unsigned AddressSpace, LinkageTypes Linkage,
const Twine &Name, GlobalObject *Aliasee, Module *Parent);
public:
// allocate space for exactly one operand
void *operator new(size_t s) {
return User::operator new(s, 1);
}
/// 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,
GlobalObject *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,
GlobalObject *Aliasee);
// Type, Parent and AddressSpace taken from the Aliasee.
static GlobalAlias *create(LinkageTypes Linkage, const Twine &Name,
GlobalObject *Aliasee);
// Linkage, Type, Parent and AddressSpace taken from the Aliasee.
static GlobalAlias *create(const Twine &Name, GlobalObject *Aliasee);
/// Provide fast operand accessors
DECLARE_TRANSPARENT_OPERAND_ACCESSORS(Constant);
/// removeFromParent - This method unlinks 'this' from the containing module,
/// but does not delete it.
///
void removeFromParent() override;
/// eraseFromParent - This method unlinks 'this' from the containing module
/// and deletes it.
///
void eraseFromParent() override;
/// set/getAliasee - These methods retrive and set alias target.
void setAliasee(GlobalObject *GO);
const GlobalObject *getAliasee() const {
return const_cast<GlobalAlias *>(this)->getAliasee();
}
GlobalObject *getAliasee() {
return cast_or_null<GlobalObject>(getOperand(0));
}
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 inline 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 llvm namespace
#endif
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