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1 /*
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2 * Copyright 2007 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 package sun.jvm.hotspot.memory;
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26
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27 import java.io.*;
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28 import java.util.*;
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29 import sun.jvm.hotspot.debugger.*;
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30 import sun.jvm.hotspot.runtime.*;
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31 import sun.jvm.hotspot.types.*;
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32
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33 public class CMSCollector extends VMObject {
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34 private static long markBitMapFieldOffset;
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35
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36 public CMSCollector(Address addr) {
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37 super(addr);
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38 }
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39
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40 static {
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41 VM.registerVMInitializedObserver(new Observer() {
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42 public void update(Observable o, Object data) {
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43 initialize(VM.getVM().getTypeDataBase());
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44 }
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45 });
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46 }
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47
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48 private static synchronized void initialize(TypeDataBase db) {
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49 Type type = db.lookupType("CMSCollector");
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50 markBitMapFieldOffset = type.getField("_markBitMap").getOffset();
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51 }
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52
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53 //Accessing mark bitmap
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54 public CMSBitMap markBitMap() {
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55 return (CMSBitMap) VMObjectFactory.newObject(
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56 CMSBitMap.class,
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57 addr.addOffsetTo(markBitMapFieldOffset));
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58 }
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59
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60 public long blockSizeUsingPrintezisBits(Address addr) {
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61 CMSBitMap markBitMap = markBitMap();
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62 long addressSize = VM.getVM().getAddressSize();
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63 if ( markBitMap.isMarked(addr) && markBitMap.isMarked(addr.addOffsetTo(1*addressSize)) ) {
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64 System.err.println("Printezis bits are set...");
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65 Address nextOneAddr = markBitMap.getNextMarkedWordAddress(addr.addOffsetTo(2*addressSize));
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66 //return size in bytes
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67 long size = (nextOneAddr.addOffsetTo(1*addressSize)).minus(addr);
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68 return size;
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69 } else {
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70 //missing Printezis marks
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71 System.err.println("Missing Printszis marks...");
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72 return -1;
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73 }
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74
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75 }
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76 }
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