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     */
013    package org.mmtk.plan.refcount;
014    
015    import org.mmtk.utility.Constants;
016    import org.mmtk.utility.deque.*;
017    
018    import org.vmmagic.pragma.*;
019    import org.vmmagic.unboxed.*;
020    
021    /**
022     * This class implements a dec-buffer for a reference counting collector
023     *
024     * @see org.mmtk.plan.TransitiveClosure
025     */
026    @Uninterruptible
027    public final class RCDecBuffer extends ObjectReferenceBuffer implements Constants {
028      /****************************************************************************
029       *
030       * Initialization
031       */
032    
033      /**
034       * Constructor
035       *
036       * @param queue The shared deque that is used.
037       */
038      public RCDecBuffer(SharedDeque queue) {
039        super("dec", queue);
040      }
041    
042      @Override
043      @Inline
044      protected void process(ObjectReference object) {
045        if (RCBase.isRCObject(object)) {
046          push(object);
047        }
048      }
049    }