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113 lines
4.3 KiB
C++
113 lines
4.3 KiB
C++
//===-- llvm/Global.h - Class to represent a global variable ----*- 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 contains the declaration of the GlobalVariable class, which
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// represents a single global variable (or constant) in the VM.
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//
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// Global variables are constant pointers that refer to hunks of space that are
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// allocated by either the VM, or by the linker in a static compiler. A global
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// variable may have an intial value, which is copied into the executables .data
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// area. Global Constants are required to have initializers.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_GLOBAL_VARIABLE_H
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#define LLVM_GLOBAL_VARIABLE_H
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#include "llvm/GlobalValue.h"
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namespace llvm {
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class Module;
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class Constant;
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class PointerType;
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template<typename SC> struct ilist_traits;
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template<typename ValueSubClass, typename ItemParentClass, typename SymTabClass,
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typename SubClass> class SymbolTableListTraits;
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class GlobalVariable : public GlobalValue {
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friend class SymbolTableListTraits<GlobalVariable, Module, Module,
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ilist_traits<GlobalVariable> >;
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void setParent(Module *parent);
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GlobalVariable *Prev, *Next;
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void setNext(GlobalVariable *N) { Next = N; }
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void setPrev(GlobalVariable *N) { Prev = N; }
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bool isConstantGlobal; // Is this a global constant?
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public:
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/// GlobalVariable ctor - If a parent module is specified, the global is
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/// automatically inserted into the end of the specified modules global list.
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///
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GlobalVariable(const Type *Ty, bool isConstant, LinkageTypes Linkage,
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Constant *Initializer = 0, const std::string &Name = "",
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Module *Parent = 0);
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// Specialize setName to handle symbol table majik...
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virtual void setName(const std::string &name, SymbolTable *ST = 0);
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/// isExternal - Is this global variable lacking an initializer? If so, the
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/// global variable is defined in some other translation unit, and is thus
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/// externally defined here.
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///
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virtual bool isExternal() const { return Operands.empty(); }
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/// hasInitializer - Unless a global variable isExternal(), it has an
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/// initializer. The initializer for the global variable/constant is held by
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/// Operands[0] if an initializer is specified.
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///
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inline bool hasInitializer() const { return !isExternal(); }
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/// getInitializer - Return the initializer for this global variable. It is
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/// illegal to call this method if the global is external, because we cannot
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/// tell what the value is initialized to!
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///
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inline Constant *getInitializer() const {
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assert(hasInitializer() && "GV doesn't have initializer!");
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return reinterpret_cast<Constant*>(Operands[0].get());
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}
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inline Constant *getInitializer() {
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assert(hasInitializer() && "GV doesn't have initializer!");
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return reinterpret_cast<Constant*>(Operands[0].get());
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}
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inline void setInitializer(Constant *CPV) {
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if (CPV == 0) {
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if (hasInitializer()) Operands.pop_back();
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} else {
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if (!hasInitializer()) Operands.push_back(Use(0, this));
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Operands[0] = reinterpret_cast<Value*>(CPV);
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}
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}
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// getNext/Prev - Return the next or previous global variable in the list.
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GlobalVariable *getNext() { return Next; }
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const GlobalVariable *getNext() const { return Next; }
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GlobalVariable *getPrev() { return Prev; }
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const GlobalVariable *getPrev() const { return Prev; }
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/// If the value is a global constant, its value is immutable throughout the
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/// runtime execution of the program. Assigning a value into the constant
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/// leads to undefined behavior.
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///
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bool isConstant() const { return isConstantGlobal; }
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void setConstant(bool Value) { isConstantGlobal = Value; }
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virtual void print(std::ostream &OS) const;
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// Methods for support type inquiry through isa, cast, and dyn_cast:
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static inline bool classof(const GlobalVariable *) { return true; }
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static inline bool classof(const Value *V) {
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return V->getValueType() == Value::GlobalVariableVal;
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}
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};
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} // End llvm namespace
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#endif
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