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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_GLOBAL_ALIAS_H
#define LLVM_GLOBAL_ALIAS_H
#include "llvm/GlobalValue.h"
#include "llvm/OperandTraits.h"
#include "llvm/ADT/ilist_node.h"
#include "llvm/ADT/Twine.h"
namespace llvm {
class Module;
class Constant;
template<typename ValueSubClass, typename ItemParentClass>
class SymbolTableListTraits;
class GlobalAlias : public GlobalValue, public ilist_node<GlobalAlias> {
friend class SymbolTableListTraits<GlobalAlias, Module>;
void operator=(const GlobalAlias &); // Do not implement
GlobalAlias(const GlobalAlias &); // Do not implement
void setParent(Module *parent);
public:
// allocate space for exactly one operand
void *operator new(size_t s) {
return User::operator new(s, 1);
}
/// GlobalAlias ctor - If a parent module is specified, the alias is
/// automatically inserted into the end of the specified module's alias list.
GlobalAlias(const Type *Ty, LinkageTypes Linkage, const Twine &Name = "",
Constant* Aliasee = 0, Module *Parent = 0);
/// Provide fast operand accessors
DECLARE_TRANSPARENT_OPERAND_ACCESSORS(Value);
/// isDeclaration - Is this global variable lacking an initializer? If so,
/// the global variable is defined in some other translation unit, and is thus
/// only a declaration here.
virtual bool isDeclaration() const;
/// removeFromParent - This method unlinks 'this' from the containing module,
/// but does not delete it.
///
virtual void removeFromParent();
/// eraseFromParent - This method unlinks 'this' from the containing module
/// and deletes it.
///
virtual void eraseFromParent();
/// set/getAliasee - These methods retrive and set alias target.
void setAliasee(Constant* GV);
const Constant* getAliasee() const {
return cast_or_null<Constant>(getOperand(0));
}
Constant* getAliasee() {
return cast_or_null<Constant>(getOperand(0));
}
/// getAliasedGlobal() - Aliasee can be either global or bitcast of
/// global. This method retrives the global for both aliasee flavours.
const GlobalValue* getAliasedGlobal() const;
/// resolveAliasedGlobal() - This method tries to ultimately resolve the alias
/// by going through the aliasing chain and trying to find the very last
/// global. Returns NULL if a cycle was found. If stopOnWeak is false, then
/// the whole chain aliasing chain is traversed, otherwise - only strong
/// aliases.
const GlobalValue* resolveAliasedGlobal(bool stopOnWeak = true) const;
// Methods for support type inquiry through isa, cast, and dyn_cast:
static inline bool classof(const GlobalAlias *) { return true; }
static inline bool classof(const Value *V) {
return V->getValueID() == Value::GlobalAliasVal;
}
};
template <>
struct OperandTraits<GlobalAlias> : public FixedNumOperandTraits<1> {
};
DEFINE_TRANSPARENT_OPERAND_ACCESSORS(GlobalAlias, Value)
} // End llvm namespace
#endif
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