/* * 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.copyms; import org.mmtk.plan.TraceLocal; import org.mmtk.plan.Trace; import org.mmtk.policy.Space; import org.vmmagic.pragma.*; import org.vmmagic.unboxed.*; /** * This class implements the thread-local functionality for a * transitive closure over a coping/mark-sweep hybrid collector. */ @Uninterruptible public final class CopyMSTraceLocal extends TraceLocal { /** * @param trace the global trace class to use */ public CopyMSTraceLocal(Trace trace) { super(CopyMS.SCAN_COPYMS, trace); } /**************************************************************************** * * Externally visible Object processing and tracing */ /** * Is the specified object reachable? */ @Override public boolean isLive(ObjectReference object) { if (object.isNull()) return false; if (Space.isInSpace(CopyMS.NURSERY, object)) { return CopyMS.nurserySpace.isLive(object); } if (Space.isInSpace(CopyMS.MARK_SWEEP, object)) { return CopyMS.msSpace.isLive(object); } return super.isLive(object); } /** * {@inheritDoc}<p> * * In this instance, we refer objects in the mark-sweep space to the * msSpace for tracing, and defer to the superclass for all others. */ @Inline @Override public ObjectReference traceObject(ObjectReference object) { if (object.isNull()) return object; if (Space.isInSpace(CopyMS.NURSERY, object)) return CopyMS.nurserySpace.traceObject(this, object, CopyMS.ALLOC_MS); if (Space.isInSpace(CopyMS.MARK_SWEEP, object)) return CopyMS.msSpace.traceObject(this, object); return super.traceObject(object); } /** * Will this object move from this point on, during the current collection ? * * @param object The object to query. */ @Override public boolean willNotMoveInCurrentCollection(ObjectReference object) { return !Space.isInSpace(CopyMS.NURSERY, object); } }