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.utility;
014    
015    import org.mmtk.utility.options.*;
016    
017    import org.vmmagic.unboxed.*;
018    import org.vmmagic.pragma.*;
019    
020    /*
021     */
022    @Uninterruptible abstract class CycleDetector {
023    
024      static {
025        Options.cycleFilterThreshold = new CycleFilterThreshold();
026        Options.cycleMetaDataLimit = new CycleMetaDataLimit();
027        Options.cycleTriggerThreshold = new CycleTriggerThreshold();
028      }
029    
030      abstract boolean collectCycles(boolean primary, boolean time);
031      abstract void possibleCycleRoot(ObjectReference object);
032    }