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.mmtk.utility.options;
014
015import org.mmtk.vm.VM;
016
017/**
018 * Should we enable a return barrier?
019 */
020public final class UseReturnBarrier extends org.vmutil.options.BooleanOption {
021  public UseReturnBarrier() {
022    super(Options.set, "Use Return Barrier",
023          "Should we enable a return barrier?",
024        false);
025  }
026
027  @Override
028  protected void validate() {
029    if (!VM.scanning.supportsReturnBarrier() && value) fail("Use of return barrier only supported on IA32 32-bit");
030  }
031}