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 */
013package 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 */
022public 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}