llvm-mirror/include/llvm/GlobalValue.h
2002-10-09 23:11:33 +00:00

57 lines
2.1 KiB
C++

//===-- 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
protected:
GlobalValue(const Type *Ty, ValueTy vty, bool hasInternalLinkage,
const std::string &name = "")
: User(Ty, vty, name), HasInternalLinkage(hasInternalLinkage), Parent(0) {}
bool HasInternalLinkage; // Is this value accessable externally?
Module *Parent;
public:
~GlobalValue() {}
/// getType - Global values are always pointers.
inline const PointerType *getType() const {
return (const PointerType*)User::getType();
}
/// Internal Linkage - True if the global value is inaccessible to
bool hasInternalLinkage() const { return HasInternalLinkage; }
bool hasExternalLinkage() const { return !HasInternalLinkage; }
void setInternalLinkage(bool HIL) { HasInternalLinkage = HIL; }
/// 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