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.plan.nogc;
014
015import org.mmtk.plan.PlanConstraints;
016
017import org.vmmagic.pragma.*;
018
019/**
020 * This class and its subclasses communicate to the host VM/Runtime
021 * any features of the selected plan that it needs to know.  This is
022 * separate from the main Plan/PlanLocal class in order to bypass any
023 * issues with ordering of static initialization.
024 */
025@Uninterruptible
026public class NoGCConstraints extends PlanConstraints {
027  @Override
028  public int gcHeaderBits() {
029    return 0;
030  }
031  @Override
032  public int gcHeaderWords() {
033    return 0;
034  }
035}