| /* |
| * 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.utility.alloc.LinearScan; |
| import org.mmtk.vm.VM; |
| |
| import org.vmmagic.pragma.*; |
| import org.vmmagic.unboxed.*; |
| |
| /** |
| * This class is used in backup tracing to sweep and zero any dead 'immortal' objects. |
| */ |
| @Uninterruptible |
| public final class BTSweepImmortalScanner extends LinearScan { |
| |
| private final BTDecMarkedAndZero sdmAZ = new BTDecMarkedAndZero(); |
| |
| /** |
| * Scan an object during sweep. |
| * |
| * @param object The source of the reference. |
| */ |
| @Inline |
| public void scan(ObjectReference object) { |
| if (!RCHeader.isMarked(object)) { |
| VM.scanning.scanObject(sdmAZ, object); |
| } else { |
| RCHeader.clearMarked(object); |
| } |
| } |
| } |