| /* |
| * 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.mmtk.vm.VM; |
| |
| 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 { |
| |
| private final BTDecMarked sdm = new BTDecMarked(); |
| |
| public boolean sweepCell(ObjectReference object) { |
| if (!RCHeader.isMarked(object)) { |
| VM.scanning.scanObject(sdm, object); |
| return true; |
| } else { |
| RCHeader.clearMarked(object); |
| } |
| return false; |
| } |
| } |