mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-12-18 17:17:49 +00:00
104 lines
4.1 KiB
C++
104 lines
4.1 KiB
C++
//===-- llvm/GlobalValue.h - Class to represent a global value --*- C++ -*-===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file was developed by the LLVM research group and is distributed under
|
|
// the University of Illinois Open Source License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// 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/Constant.h"
|
|
|
|
namespace llvm {
|
|
|
|
class PointerType;
|
|
class Module;
|
|
|
|
class GlobalValue : public Constant {
|
|
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 = "")
|
|
: Constant(Ty, vty, name), Linkage(linkage), Parent(0) { }
|
|
|
|
LinkageTypes Linkage; // The linkage of this global
|
|
Module *Parent;
|
|
public:
|
|
virtual ~GlobalValue();
|
|
|
|
/// If the usage is empty (except transitively dead constants), then this
|
|
/// global value can can be safely deleted since the destructor will
|
|
/// delete the dead constants as well.
|
|
/// @brief Determine if the usage of this global value is empty except
|
|
/// for transitively dead constants.
|
|
bool use_empty_except_constants();
|
|
|
|
/// getType - Global values are always pointers.
|
|
inline const PointerType *getType() const {
|
|
return reinterpret_cast<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; }
|
|
|
|
/// Override from Constant class. No GlobalValue's have null values so
|
|
/// this always returns false.
|
|
virtual bool isNullValue() const { return false; }
|
|
|
|
/// Override from Constant class.
|
|
virtual void destroyConstant();
|
|
|
|
/// 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; }
|
|
|
|
/// removeDeadConstantUsers - If there are any dead constant users dangling
|
|
/// off of this global value, remove them. This method is useful for clients
|
|
/// that want to check to see if a global is unused, but don't want to deal
|
|
/// with potentially dead constants hanging off of the globals.
|
|
///
|
|
/// This function returns true if the global value is now dead. If all
|
|
/// users of this global are not dead, this method may return false and
|
|
/// leave some of them around.
|
|
bool removeDeadConstantUsers();
|
|
|
|
// 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;
|
|
}
|
|
};
|
|
|
|
} // End llvm namespace
|
|
|
|
#endif
|