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//===-- llvm/Constant.h - Constant class definition --------------*- C++ -*--=//
//
// This file contains the declaration of the Constant class.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_CONSTANT_H
#define LLVM_CONSTANT_H
#include "llvm/User.h"
class Constant : public User {
protected:
inline Constant(const Type *Ty) : User(Ty, Value::ConstantVal) {}
~Constant() {}
void destroyConstantImpl();
public:
/// setName - Specialize setName to handle symbol table majik...
virtual void setName(const std::string &name, SymbolTable *ST = 0);
/// Static constructor to get a '0' constant of arbitrary type...
static Constant *getNullValue(const Type *Ty);
/// isNullValue - Return true if this is the value that would be returned by
/// getNullValue.
virtual bool isNullValue() const = 0;
virtual void print(std::ostream &O) const;
/// isConstantExpr - Return true if this is a ConstantExpr
virtual bool isConstantExpr() const { return false; }
/// destroyConstant - Called if some element of this constant is no longer
/// valid. At this point only other constants may be on the use_list for this
/// constant. Any constants on our Use list must also be destroy'd. The
/// implementation must be sure to remove the constant from the list of
/// available cached constants. Implementations should call
/// destroyConstantImpl as the last thing they do, to destroy all users and
/// delete this.
///
/// Note that this call is only valid on non-primitive constants: You cannot
/// destroy an integer constant for example. This API is used to delete
/// constants that have ConstantPointerRef's embeded in them when the module
/// is deleted, and it is used by GlobalDCE to remove ConstantPointerRefs that
/// are unneeded, allowing globals to be DCE'd.
///
virtual void destroyConstant() { assert(0 && "Not reached!"); }
/// Methods for support type inquiry through isa, cast, and dyn_cast:
static inline bool classof(const Constant *) { return true; }
static inline bool classof(const Value *V) {
return V->getValueType() == Value::ConstantVal;
}
// WARNING: Only to be used by Bytecode & Assembly Parsers! USER CODE SHOULD
// NOT USE THIS!!
// Returns the number of uses of OldV that were replaced.
virtual unsigned mutateReferences(Value* OldV, Value *NewV) { return 0; }
// END WARNING!!
};
#endif
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