001    /*
002     *  This file is part of the Jikes RVM project (http://jikesrvm.org).
003     *
004     *  This file is licensed to You under the Eclipse Public License (EPL);
005     *  You may not use this file except in compliance with the License. You
006     *  may obtain a copy of the License at
007     *
008     *      http://www.opensource.org/licenses/eclipse-1.0.php
009     *
010     *  See the COPYRIGHT.txt file distributed with this work for information
011     *  regarding copyright ownership.
012     */
013    package org.jikesrvm.compilers.opt.dfsolver;
014    
015    /**
016     * DF_Operator.java
017     *
018     * represents a function for DF_LatticeCell values
019     */
020    public abstract class DF_Operator {
021    
022      /**
023       * Evaluate this equation, setting a new value for the
024       * left-hand side.
025       *
026       * @param operands The operands for this operator.  operands[0]
027       *                is the left-hand side.
028       * @return true if the lhs value changes. false otherwise.
029       */
030      public abstract boolean evaluate(DF_LatticeCell[] operands);
031    }
032    
033    
034