/*
* This file is part of the Jikes RVM project (http://jikesrvm.org).
*
* This file is licensed to You under the Common Public License (CPL);
* You may not use this file except in compliance with the License. You
* may obtain a copy of the License at
*
* http://www.opensource.org/licenses/cpl1.0.php
*
* See the COPYRIGHT.txt file distributed with this work for information
* regarding copyright ownership.
*/
package org.jikesrvm.compilers.opt;
import java.util.Iterator;
/**
* OPT_DF_LatticeCell.java
*
* Represents a single lattice cell in a dataflow equation system.
*/
interface OPT_DF_LatticeCell extends OPT_GraphNode {
/**
* Returns an enumeration of the equations in which this
* lattice cell is used.
* @return an enumeration of the equations in which this
* lattice cell is used
*/
Iterator<OPT_DF_Equation> getUses();
/**
* Returns an enumeration of the equations in which this
* lattice cell is defined.
* @return an enumeration of the equations in which this
* lattice cell is defined
*/
Iterator<OPT_DF_Equation> getDefs();
/**
* Return a string representation of the cell
* @return a string representation of the cell
*/
String toString();
/**
* Note that this variable appears on the RHS of an equation
*
* @param eq the equation
*/
void addUse(OPT_DF_Equation eq);
/**
* Note that this variable appears on the LHS of an equation
*
* @param eq the equation
*/
void addDef(OPT_DF_Equation eq);
}