/* * 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; } }