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//===-- llvm/GlobalValue.h - Class to represent a global value --*- C++ -*-===//
//
// This file is a common base class of all globally definable objects. As such,
// it is subclassed by GlobalVariable and by Function. This is used because you
// can do certain things with these global objects that you can't do to anything
// else. For example, use the address of one as a constant.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_GLOBALVALUE_H
#define LLVM_GLOBALVALUE_H
#include "llvm/User.h"
class PointerType;
class Module;
class GlobalValue : public User {
GlobalValue(const GlobalValue &); // do not implement
public:
enum LinkageTypes {
ExternalLinkage, // Externally visible function
LinkOnceLinkage, // Keep one copy of named function when linking (inline)
WeakLinkage, // Keep one copy of named function when linking (weak)
AppendingLinkage, // Special purpose, only applies to global arrays
InternalLinkage // Rename collisions when linking (static functions)
};
protected:
GlobalValue(const Type *Ty, ValueTy vty, LinkageTypes linkage,
const std::string &name = "")
: User(Ty, vty, name), Linkage(linkage), Parent(0) {}
LinkageTypes Linkage; // The linkage of this global
Module *Parent;
public:
~GlobalValue() {}
/// getType - Global values are always pointers.
inline const PointerType *getType() const {
return (const PointerType*)User::getType();
}
bool hasExternalLinkage() const { return Linkage == ExternalLinkage; }
bool hasLinkOnceLinkage() const { return Linkage == LinkOnceLinkage; }
bool hasWeakLinkage() const { return Linkage == WeakLinkage; }
bool hasAppendingLinkage() const { return Linkage == AppendingLinkage; }
bool hasInternalLinkage() const { return Linkage == InternalLinkage; }
void setLinkage(LinkageTypes LT) { Linkage = LT; }
LinkageTypes getLinkage() const { return Linkage; }
/// isExternal - Return true if the primary definition of this global value is
/// outside of the current translation unit...
virtual bool isExternal() const = 0;
/// getParent - Get the module that this global value is contained inside
/// of...
inline Module *getParent() { return Parent; }
inline const Module *getParent() const { return Parent; }
// Methods for support type inquiry through isa, cast, and dyn_cast:
static inline bool classof(const GlobalValue *T) { return true; }
static inline bool classof(const Value *V) {
return V->getValueType() == Value::FunctionVal ||
V->getValueType() == Value::GlobalVariableVal;
}
};
#endif
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