/*
* This file is part of the Jikes RVM project (http://jikesrvm.org).
*
* This file is licensed to You under the Eclipse Public License (EPL);
* You may not use this file except in compliance with the License. You
* may obtain a copy of the License at
*
* http://www.opensource.org/licenses/eclipse-1.0.php
*
* See the COPYRIGHT.txt file distributed with this work for information
* regarding copyright ownership.
*/
package org.mmtk.plan.refcount.backuptrace;
import org.mmtk.plan.refcount.RCHeader;
import org.mmtk.policy.ExplicitFreeListSpace;
import org.vmmagic.pragma.*;
import org.vmmagic.unboxed.*;
/**
* This class implements the thread-local core functionality for a transitive
* closure over the heap graph.
*/
@Uninterruptible
public final class BTSweeper extends ExplicitFreeListSpace.Sweeper {
@Override
public boolean sweepCell(ObjectReference object) {
if (!RCHeader.isMarked(object)) {
return true;
} else {
RCHeader.clearMarked(object);
}
return false;
}
}