001    /*
002     *  This file is part of the Jikes RVM project (http://jikesrvm.org).
003     *
004     *  This file is licensed to You under the Eclipse Public License (EPL);
005     *  You may not use this file except in compliance with the License. You
006     *  may obtain a copy of the License at
007     *
008     *      http://www.opensource.org/licenses/eclipse-1.0.php
009     *
010     *  See the COPYRIGHT.txt file distributed with this work for information
011     *  regarding copyright ownership.
012     */
013    package org.mmtk.utility.sanitychecker;
014    
015    import org.mmtk.plan.Plan;
016    import org.mmtk.plan.Simple;
017    import org.mmtk.utility.Constants;
018    
019    import org.mmtk.vm.VM;
020    
021    import org.vmmagic.pragma.*;
022    
023    /**
024     * This class performs sanity checks for Simple collectors.
025     */
026    @Uninterruptible
027    public final class SanityCheckerLocal implements Constants {
028    
029      /** Trace */
030      final SanityRootTraceLocal rootTraceLocal;
031    
032      /****************************************************************************
033       * Constants
034       */
035      public SanityCheckerLocal() {
036        rootTraceLocal = new SanityRootTraceLocal(Plan.sanityChecker.rootTrace);
037      }
038    
039      /**
040       * Perform any sanity checking collection phases.
041       *
042       * @param phaseId The id to process
043       * @param primary Perform local single threaded actions on this thread
044       * @return True if the phase was handled.
045       */
046      @NoInline
047      public boolean collectionPhase(int phaseId, boolean primary) {
048        if (phaseId == Simple.SANITY_PREPARE) {
049          rootTraceLocal.prepare();
050          return true;
051        }
052    
053        if (phaseId == Simple.SANITY_ROOTS) {
054          VM.scanning.computeGlobalRoots(rootTraceLocal);
055          VM.scanning.computeThreadRoots(rootTraceLocal);
056          VM.scanning.computeStaticRoots(rootTraceLocal);
057          if (Plan.SCAN_BOOT_IMAGE) {
058            VM.scanning.computeBootImageRoots(rootTraceLocal);
059          }
060          rootTraceLocal.flush();
061          return true;
062        }
063    
064        if (phaseId == Simple.SANITY_COPY_ROOTS) {
065          if (primary) {
066            rootTraceLocal.copyRootValuesTo(Plan.sanityChecker.checkTraceLocal);
067          }
068          return true;
069        }
070    
071        if (phaseId == Simple.SANITY_RELEASE) {
072          rootTraceLocal.release();
073          return true;
074        }
075    
076        return false;
077      }
078    }