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//===-- llvm/Global.h - Class to represent a global variable -----*- C++ -*--=//
//
// This file contains the declaration of the GlobalVariable class, which
// represents a single global variable (or constant) in the VM.
//
// Global variables are constant pointers that refer to hunks of space that are
// allocated by either the VM, or by the linker in a static compiler. A global
// variable may have an intial value, which is copied into the executables .data
// area. Global Constants are required to have initializers.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_GLOBAL_VARIABLE_H
#define LLVM_GLOBAL_VARIABLE_H
#include "llvm/User.h"
class Module;
class ConstPoolVal;
class PointerType;
class GlobalVariable : public User {
Module *Parent; // The module that contains this method
friend class ValueHolder<GlobalVariable, Module, Module>;
void setParent(Module *parent) { Parent = parent; }
bool Constant; // Is this a global constant?
public:
GlobalVariable(const Type *Ty, bool isConstant, ConstPoolVal *Initializer = 0,
const string &Name = "");
~GlobalVariable() {}
// getType - Global variables are always pointers
inline const PointerType *getType() const {
return (const PointerType*)User::getType();
}
// Specialize setName to handle symbol table majik...
virtual void setName(const string &name, SymbolTable *ST = 0);
inline Module *getParent() { return Parent; }
inline const Module *getParent() const { return Parent; }
// The initializer for the global variable/constant is held by Operands[0] if
// an initializer is specified.
//
inline bool hasInitializer() const { return !Operands.empty(); }
inline const ConstPoolVal *getInitializer() const {
return Operands[0]->castConstantAsserting();
}
inline ConstPoolVal *getInitializer() {
return Operands[0]->castConstantAsserting();
}
inline void setInitializer(ConstPoolVal *CPV) { Operands[0] = (Value*)CPV; }
// If the value is a global constant, its value is immutable throughout the
// runtime execution of the program. Assigning a value into the constant
// leads to undefined behavior.
//
inline bool isConstant() const { return Constant; }
};
#endif
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