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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;
}
/// replaceUsesOfWithOnConstant - This method is a special form of
/// User::replaceUsesOfWith (which does not work on constants) that does work
/// on constants. Basically this method goes through the trouble of building
/// a new constant that is equivalent to the current one, with all uses of
/// From replaced with uses of To. After this construction is completed, all
/// of the users of 'this' are replaced to use the new constant, and then
/// 'this' is deleted. In general, you should not call this method, instead,
/// use Value::replaceAllUsesWith, which automatically dispatches to this
/// method as needed.
///
virtual void replaceUsesOfWithOnConstant(Value *From, Value *To,
bool DisableChecking = false) {
// Provide a default implementation for constants (like integers) that
// cannot use any other values. This cannot be called at runtime, but needs
// to be here to avoid link errors.
assert(getNumOperands() == 0 && "replaceUsesOfWithOnConstant must be "
"implemented for all constants that have operands!");
assert(0 && "Constants that do not have operands cannot be using 'From'!");
}
// 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.
unsigned mutateReferences(Value* OldV, Value *NewV);
// END WARNING!!
};
#endif
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