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.refcount.generational;
014
015import static org.mmtk.policy.SegregatedFreeListSpace.MAX_FREELIST_OBJECT_BYTES;
016
017import org.mmtk.plan.refcount.RCBaseConstraints;
018import org.vmmagic.pragma.*;
019
020/**
021 * This class and its subclasses communicate to the host VM/Runtime
022 * any features of the selected plan that it needs to know.  This is
023 * separate from the main Plan/PlanLocal class in order to bypass any
024 * issues with ordering of static initialization.
025 */
026@Uninterruptible
027public class GenRCConstraints extends RCBaseConstraints {
028  @Override
029  public boolean movesObjects() {
030    return true;
031  }
032  @Override
033  public int maxNonLOSCopyBytes() {
034    return MAX_FREELIST_OBJECT_BYTES;
035  }
036  @Override
037  public boolean buildForGenRC() {
038    return true;
039  }
040}