| /* |
| * 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.stickyms; |
| |
| import org.mmtk.plan.*; |
| import org.mmtk.plan.marksweep.MSCollector; |
| import org.mmtk.plan.marksweep.MSTraceLocal; |
| import org.mmtk.utility.deque.ObjectReferenceDeque; |
| import org.mmtk.vm.VM; |
| |
| import org.vmmagic.pragma.*; |
| |
| /** |
| * This class implements <i>per-collector thread</i> behavior |
| * and state for the <i>StickMS</i> plan, which implements a generational |
| * sticky mark bits mark-sweep collector.<p> |
| * |
| * Specifically, this class defines <i>StickyMS</i> collection behavior |
| * (through <code>trace</code> and the <code>collectionPhase</code> |
| * method).<p> |
| * |
| * @see StickyMS for an overview of the algorithm.<p> |
| * @see StickyMSMutator |
| * @see StopTheWorldCollector |
| * @see CollectorContext |
| * @see Phase |
| */ |
| @Uninterruptible |
| public class StickyMSCollector extends MSCollector { |
| |
| /**************************************************************************** |
| * Instance fields |
| */ |
| private StickyMSNurseryTraceLocal nurseryTrace; |
| |
| /**************************************************************************** |
| * Initialization |
| */ |
| |
| /** |
| * Constructor |
| */ |
| public StickyMSCollector() { |
| ObjectReferenceDeque modBuffer = new ObjectReferenceDeque("mod buffer", global().modPool); |
| fullTrace = new MSTraceLocal(global().msTrace, modBuffer); |
| nurseryTrace = new StickyMSNurseryTraceLocal(global().msTrace, modBuffer); |
| } |
| |
| /**************************************************************************** |
| * |
| * Collection |
| */ |
| |
| /** |
| * Perform a per-collector collection phase. |
| * |
| * @param phaseId The collection phase to perform |
| * @param primary Perform any single-threaded activities using this thread. |
| */ |
| @Inline |
| public final void collectionPhase(short phaseId, boolean primary) { |
| boolean collectWholeHeap = global().collectWholeHeap; |
| |
| if (phaseId == StickyMS.PREPARE) { |
| currentTrace = collectWholeHeap ? (TraceLocal) fullTrace : (TraceLocal) nurseryTrace; |
| global().modPool.prepareNonBlocking(); /* always do this */ |
| } |
| |
| if (!collectWholeHeap) { |
| if (phaseId == StickyMS.PREPARE) { |
| nurseryTrace.prepare(); |
| return; |
| } |
| |
| if (phaseId == StickyMS.ROOTS) { |
| VM.scanning.computeStaticRoots(currentTrace); |
| VM.scanning.computeGlobalRoots(currentTrace); |
| return; |
| } |
| |
| if (phaseId == StickyMS.CLOSURE) { |
| nurseryTrace.completeTrace(); |
| return; |
| } |
| |
| if (phaseId == StickyMS.RELEASE) { |
| nurseryTrace.release(); |
| global().modPool.reset(); |
| return; |
| } |
| } |
| |
| super.collectionPhase(phaseId, primary); |
| } |
| |
| /**************************************************************************** |
| * |
| * Miscellaneous |
| */ |
| |
| /** @return The active global plan as an <code>MS</code> instance. */ |
| @Inline |
| private static StickyMS global() { |
| return (StickyMS) VM.activePlan.global(); |
| } |
| } |