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.fullheap;
014
015import org.mmtk.plan.TraceLocal;
016import org.mmtk.plan.TransitiveClosure;
017import org.mmtk.plan.refcount.RCBaseCollector;
018import org.vmmagic.pragma.*;
019
020/**
021 * This class implements the collector context for a reference counting collector.
022 * See Shahriyar et al for details of and rationale for the optimizations used
023 * here (http://dx.doi.org/10.1145/2258996.2259008).  See Chapter 4 of
024 * Daniel Frampton's PhD thesis for details of and rationale for the cycle
025 * collection strategy used by this collector.
026 */
027@Uninterruptible
028public class RCCollector extends RCBaseCollector {
029  /************************************************************************
030   * Initialization
031   */
032
033  /**
034   *
035   */
036  private final RCFindRootSetTraceLocal rootTrace;
037  private final RCModifiedProcessor modProcessor;
038
039  /**
040   * Constructor.
041   */
042  public RCCollector() {
043    rootTrace = new RCFindRootSetTraceLocal(global().rootTrace, newRootBuffer);
044    modProcessor = new RCModifiedProcessor(this);
045  }
046
047  @Override
048  protected final TransitiveClosure getModifiedProcessor() {
049    return modProcessor;
050  }
051
052  @Override
053  protected final TraceLocal getRootTrace() {
054    return rootTrace;
055  }
056}