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