X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=include%2Fllvm%2FGlobalVariable.h;h=28eaa624e9d2b2e710cce9d0f0568748712b5696;hb=b4cfd15d9901883cfb46ac3826e0a27573089372;hp=f46fa359cb6761e90f7a6c1684ac72dd7342a81b;hpb=e9bb2df410f7a22decad9a883f7139d5857c1520;p=oota-llvm.git diff --git a/include/llvm/GlobalVariable.h b/include/llvm/GlobalVariable.h index f46fa359cb6..28eaa624e9d 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 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. @@ -14,56 +21,141 @@ #define LLVM_GLOBAL_VARIABLE_H #include "llvm/GlobalValue.h" +#include "llvm/OperandTraits.h" +#include "llvm/ADT/ilist_node.h" + +namespace llvm { + class Module; class Constant; -class PointerType; +class LLVMContext; +template + class SymbolTableListTraits; + +class GlobalVariable : public GlobalValue, public ilist_node { + friend class SymbolTableListTraits; + void *operator new(size_t, unsigned); // Do not implement + void operator=(const GlobalVariable &); // Do not implement + GlobalVariable(const GlobalVariable &); // Do not implement -class GlobalVariable : public GlobalValue { - friend class ValueHolder; - void setParent(Module *parent) { Parent = parent; } + void setParent(Module *parent); + + bool isConstantGlobal : 1; // Is this a global constant? + bool isThreadLocalSymbol : 1; // Is this symbol "Thread Local"? - bool isConstantGlobal; // Is this a global constant? public: - GlobalVariable(const Type *Ty, bool isConstant, bool isInternal, - Constant *Initializer = 0, const string &Name = ""); - ~GlobalVariable() {} - - // Specialize setName to handle symbol table majik... - virtual void setName(const string &name, SymbolTable *ST = 0); - - // 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 Constant *getInitializer() const { + // allocate space for exactly one operand + void *operator new(size_t s) { + return User::operator new(s, 1); + } + /// GlobalVariable ctor - If a parent module is specified, the global is + /// automatically inserted into the end of the specified modules global list. + GlobalVariable(LLVMContext &Context, const Type *Ty, bool isConstant, + LinkageTypes Linkage, + Constant *Initializer = 0, const std::string &Name = "", + bool ThreadLocal = false, unsigned AddressSpace = 0); + /// GlobalVariable ctor - This creates a global and inserts it before the + /// specified other global. + GlobalVariable(Module &M, const Type *Ty, bool isConstant, + LinkageTypes Linkage, Constant *Initializer, + const std::string &Name, + GlobalVariable *InsertBefore = 0, bool ThreadLocal = false, + unsigned AddressSpace = 0); + + ~GlobalVariable() { + NumOperands = 1; // FIXME: needed by operator delete + } + + /// Provide fast operand accessors + DECLARE_TRANSPARENT_OPERAND_ACCESSORS(Value); + + /// 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; } + + /// 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(); } + + /// hasDefinitiveInitializer - Whether the global variable has an initializer, + /// and this is the initializer that will be used in the final executable. + inline bool hasDefinitiveInitializer() const { + return hasInitializer() && + // The initializer of a global variable with weak linkage may change at + // link time. + !mayBeOverridden(); + } + + /// 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 /*const FIXME*/ Constant *getInitializer() const { assert(hasInitializer() && "GV doesn't have initializer!"); - return (Constant*)Operands[0].get(); + return static_cast(Op<0>().get()); } inline Constant *getInitializer() { assert(hasInitializer() && "GV doesn't have initializer!"); - return (Constant*)Operands[0].get(); + return static_cast(Op<0>().get()); } inline void setInitializer(Constant *CPV) { if (CPV == 0) { - if (hasInitializer()) Operands.pop_back(); + if (hasInitializer()) { + Op<0>().set(0); + NumOperands = 0; + } } else { - if (!hasInitializer()) Operands.push_back(Use(0, this)); - Operands[0] = (Value*)CPV; + if (!hasInitializer()) + NumOperands = 1; + Op<0>().set(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 Val) { isConstantGlobal = Val; } + + /// If the value is "Thread Local", its value isn't shared by the threads. + bool isThreadLocal() const { return isThreadLocalSymbol; } + void setThreadLocal(bool Val) { isThreadLocalSymbol = Val; } + + /// copyAttributesFrom - copy all additional attributes (those not needed to + /// create a GlobalVariable) from the GlobalVariable Src to this one. + void copyAttributesFrom(const GlobalValue *Src); - // 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 isConstantGlobal; } + /// removeFromParent - This method unlinks 'this' from the containing module, + /// but does not delete it. + /// + virtual void removeFromParent(); + + /// eraseFromParent - This method unlinks 'this' from the containing module + /// and deletes it. + /// + virtual void eraseFromParent(); + + /// Override Constant's implementation of this method so we can + /// replace constant initializers. + virtual void replaceUsesOfWithOnConstant(Value *From, Value *To, Use *U); // Methods for support type inquiry through isa, cast, and dyn_cast: static inline bool classof(const GlobalVariable *) { return true; } static inline bool classof(const Value *V) { - return V->getValueType() == Value::GlobalVariableVal; + return V->getValueID() == Value::GlobalVariableVal; } }; +template <> +struct OperandTraits : OptionalOperandTraits<> { +}; + +DEFINE_TRANSPARENT_OPERAND_ACCESSORS(GlobalVariable, Value) + +} // End llvm namespace + #endif