X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=include%2Fllvm%2FGlobalVariable.h;h=00d4acb66daf53d5886cc5af540a8bfa74f4f59e;hb=a727d5502c8e23c090da658bf14c5ebc1169a070;hp=f301844bd72df859eb059b6c3556fdf6677807fd;hpb=cfe26c930ae691ff3012736555846c45087e1a9e;p=oota-llvm.git diff --git a/include/llvm/GlobalVariable.h b/include/llvm/GlobalVariable.h index f301844bd72..00d4acb66da 100644 --- a/include/llvm/GlobalVariable.h +++ b/include/llvm/GlobalVariable.h @@ -1,4 +1,11 @@ -//===-- llvm/Global.h - Class to represent a global variable -----*- C++ -*--=// +//===-- llvm/GlobalVariable.h - GlobalVariable class ------------*- 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 contains the declaration of the GlobalVariable class, which // represents a single global variable (or constant) in the VM. @@ -13,58 +20,120 @@ #ifndef LLVM_GLOBAL_VARIABLE_H #define LLVM_GLOBAL_VARIABLE_H -#include "llvm/User.h" +#include "llvm/GlobalValue.h" + +namespace llvm { + class Module; -class ConstPoolVal; +class Constant; class PointerType; +template + class SymbolTableListTraits; -class GlobalVariable : public User { - Module *Parent; // The module that contains this method +class GlobalVariable : public GlobalValue { + friend class SymbolTableListTraits; + void operator=(const GlobalVariable &); // Do not implement + GlobalVariable(const GlobalVariable &); // Do not implement - friend class ValueHolder; - void setParent(Module *parent) { Parent = parent; } + void setParent(Module *parent); - bool Constant; // Is this a global constant? -public: - GlobalVariable(const Type *Ty, bool isConstant, ConstPoolVal *Initializer = 0, - const string &Name = ""); - ~GlobalVariable() {} + GlobalVariable *Prev, *Next; + void setNext(GlobalVariable *N) { Next = N; } + void setPrev(GlobalVariable *N) { Prev = N; } - // getType - Global variables are always pointers - inline const PointerType *getType() const { - return (const PointerType*)User::getType(); - } + bool isConstantGlobal : 1; // Is this a global constant? + bool isThreadLocalSymbol : 1; // Is this symbol "Thread Local"? + Use Initializer; - // Specialize setName to handle symbol table majik... - virtual void setName(const string &name, SymbolTable *ST = 0); +public: + /// GlobalVariable ctor - If a parent module is specified, the global is + /// automatically inserted into the end of the specified modules global list. + GlobalVariable(const Type *Ty, bool isConstant, LinkageTypes Linkage, + Constant *Initializer = 0, const std::string &Name = "", + Module *Parent = 0, bool ThreadLocal = false); + /// GlobalVariable ctor - This creates a global and inserts it before the + /// specified other global. + GlobalVariable(const Type *Ty, bool isConstant, LinkageTypes Linkage, + Constant *Initializer, const std::string &Name, + GlobalVariable *InsertBefore, bool ThreadLocal = false); + + /// isDeclaration - Is this global variable lacking an initializer? If so, + /// the global variable is defined in some other translation unit, and is thus + /// only a declaration here. + virtual bool isDeclaration() const { return getNumOperands() == 0; } - inline Module *getParent() { return Parent; } - inline const Module *getParent() const { return Parent; } + /// hasInitializer - Unless a global variable isExternal(), it has an + /// initializer. The initializer for the global variable/constant is held by + /// Initializer if an initializer is specified. + /// + inline bool hasInitializer() const { return !isDeclaration(); } - // 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 (const ConstPoolVal*)Operands[0].get(); + /// getInitializer - Return the initializer for this global variable. It is + /// illegal to call this method if the global is external, because we cannot + /// tell what the value is initialized to! + /// + inline Constant *getInitializer() const { + assert(hasInitializer() && "GV doesn't have initializer!"); + return reinterpret_cast(Initializer.get()); + } + inline Constant *getInitializer() { + assert(hasInitializer() && "GV doesn't have initializer!"); + return reinterpret_cast(Initializer.get()); } - inline ConstPoolVal *getInitializer() { - return (ConstPoolVal*)Operands[0].get(); + inline void setInitializer(Constant *CPV) { + if (CPV == 0) { + if (hasInitializer()) { + Initializer.set(0); + NumOperands = 0; + } + } else { + if (!hasInitializer()) + NumOperands = 1; + Initializer.set(CPV); + } } - 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. + /// + bool isConstant() const { return isConstantGlobal; } + void setConstant(bool Value) { isConstantGlobal = Value; } + + /// If the value is "Thread Local", its value isn't shared by the threads. + bool isThreadLocal() const { return isThreadLocalSymbol; } + void setThreadLocal(bool Value) { isThreadLocalSymbol = Value; } + + /// removeFromParent - This method unlinks 'this' from the containing module, + /// but does not delete it. + /// + void removeFromParent(); - // 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; } + /// eraseFromParent - This method unlinks 'this' from the containing module + /// and deletes it. + /// + void eraseFromParent(); + + /// Override Constant's implementation of this method so we can + /// replace constant initializers. + virtual void replaceUsesOfWithOnConstant(Value *From, Value *To, Use *U); + + virtual void print(std::ostream &OS) const; + void print(std::ostream *OS) const { if (OS) print(*OS); } // Methods for support type inquiry through isa, cast, and dyn_cast: - static inline bool isa(const GlobalVariable *) { return true; } - static inline bool isa(const Value *V) { - return V->getValueType() == Value::GlobalVal; + static inline bool classof(const GlobalVariable *) { return true; } + static inline bool classof(const Value *V) { + return V->getValueID() == Value::GlobalVariableVal; } +private: + // getNext/Prev - Return the next or previous global variable in the list. + GlobalVariable *getNext() { return Next; } + const GlobalVariable *getNext() const { return Next; } + GlobalVariable *getPrev() { return Prev; } + const GlobalVariable *getPrev() const { return Prev; } }; +} // End llvm namespace + #endif