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.ir.operand;
014    
015    
016    /**
017     * This operand represents, in a phi function, a control-flow path that is
018     * actually unreachable.
019     *
020     * @see Operand
021     */
022    public final class UnreachableOperand extends ConstantOperand {
023    
024      @Override
025      public Operand copy() {
026        return new UnreachableOperand();
027      }
028    
029      @Override
030      public boolean similar(Operand op) {
031        return op instanceof UnreachableOperand;
032      }
033    
034      /**
035       * Returns the string representation of this operand.
036       *
037       * @return a string representation of this operand.
038       */
039      @Override
040      public String toString() {
041        return "<unreachable>";
042      }
043    }