1 /* |
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2 * Copyright (c) 2007, 2015, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * 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.gc.cms; |
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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 Address nextOneAddr = markBitMap.getNextMarkedWordAddress(addr.addOffsetTo(2*addressSize)); |
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65 //return size in bytes |
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66 long size = (nextOneAddr.addOffsetTo(1*addressSize)).minus(addr); |
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67 return size; |
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68 } else { |
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69 //missing Printezis marks |
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70 return -1; |
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71 } |
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72 |
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73 } |
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74 } |
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