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.poisoned;
014
015import org.mmtk.plan.marksweep.MSConstraints;
016import org.vmmagic.pragma.*;
017
018/**
019 * This class and its subclasses communicate to the host VM/Runtime
020 * any features of the selected plan that it needs to know.  This is
021 * separate from the main Plan/PlanLocal class in order to bypass any
022 * issues with ordering of static initialization.
023 */
024@Uninterruptible
025public class PoisonedConstraints extends MSConstraints {
026  @Override
027  public boolean needsObjectReferenceWriteBarrier() {
028    return true;
029  }
030  @Override
031  public boolean needsObjectReferenceReadBarrier() {
032    return true;
033  }
034  @Override
035  public boolean needsObjectReferenceNonHeapWriteBarrier() {
036    return false;
037  }
038  @Override
039  public boolean needsObjectReferenceNonHeapReadBarrier() {
040    return false;
041  }
042}