-//===-- 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.
#define LLVM_GLOBAL_VARIABLE_H
#include "llvm/GlobalValue.h"
+
+namespace llvm {
+
class Module;
-class ConstPoolVal;
+class Constant;
class PointerType;
+template<typename SC> struct ilist_traits;
+template<typename ValueSubClass, typename ItemParentClass, typename SymTabClass,
+ typename SubClass> class SymbolTableListTraits;
class GlobalVariable : public GlobalValue {
- friend class ValueHolder<GlobalVariable, Module, Module>;
- void setParent(Module *parent) { Parent = parent; }
+ friend class SymbolTableListTraits<GlobalVariable, Module, Module,
+ ilist_traits<GlobalVariable> >;
+ void operator=(const GlobalVariable &); // Do not implement
+ GlobalVariable(const GlobalVariable &); // Do not implement
+
+ void setParent(Module *parent);
+
+ GlobalVariable *Prev, *Next;
+ void setNext(GlobalVariable *N) { Next = N; }
+ void setPrev(GlobalVariable *N) { Prev = N; }
+
+ bool isConstantGlobal; // Is this a global constant?
+ Use Initializer;
- bool Constant; // Is this a global constant?
public:
- GlobalVariable(const Type *Ty, bool isConstant, ConstPoolVal *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 ConstPoolVal *getInitializer() const {
+ /// 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);
+
+ /// isExternal - Is this global variable lacking an initializer? If so, the
+ /// global variable is defined in some other translation unit, and is thus
+ /// externally defined here.
+ ///
+ virtual bool isExternal() 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 !isExternal(); }
+
+ /// 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 (ConstPoolVal*)Operands[0].get();
+ return reinterpret_cast<Constant*>(Initializer.get());
}
- inline ConstPoolVal *getInitializer() {
+ inline Constant *getInitializer() {
assert(hasInitializer() && "GV doesn't have initializer!");
- return (ConstPoolVal*)Operands[0].get();
+ return reinterpret_cast<Constant*>(Initializer.get());
}
- inline void setInitializer(ConstPoolVal *CPV) {
+ inline void setInitializer(Constant *CPV) {
if (CPV == 0) {
- if (hasInitializer()) Operands.pop_back();
+ if (hasInitializer()) {
+ Initializer.set(0);
+ NumOperands = 0;
+ }
} else {
- if (!hasInitializer()) Operands.push_back(Use(0, this));
- Operands[0] = (Value*)CPV;
+ if (!hasInitializer())
+ NumOperands = 1;
+ Initializer.set(CPV);
}
}
+ // 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; }
+
+ /// 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 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; }
+ /// removeFromParent - This method unlinks 'this' from the containing module,
+ /// but does not delete it.
+ ///
+ void removeFromParent();
+
+ /// 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;
// Methods for support type inquiry through isa, cast, and dyn_cast:
static inline bool classof(const GlobalVariable *) { return true; }
}
};
+} // End llvm namespace
+
#endif
projects / oota-llvm.git / blobdiff