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comparison agent/src/share/classes/sun/jvm/hotspot/memory/CMSCollector.java @ 0:a61af66fc99e jdk7-b24

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author duke
date Sat, 01 Dec 2007 00:00:00 +0000
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children c18cbe5936b8
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-1:000000000000 0:a61af66fc99e
1 /*
2 * Copyright 2007 Sun Microsystems, Inc. All Rights Reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
24
25 package sun.jvm.hotspot.memory;
26
27 import java.io.*;
28 import java.util.*;
29 import sun.jvm.hotspot.debugger.*;
30 import sun.jvm.hotspot.runtime.*;
31 import sun.jvm.hotspot.types.*;
32
33 public class CMSCollector extends VMObject {
34 private static long markBitMapFieldOffset;
35
36 public CMSCollector(Address addr) {
37 super(addr);
38 }
39
40 static {
41 VM.registerVMInitializedObserver(new Observer() {
42 public void update(Observable o, Object data) {
43 initialize(VM.getVM().getTypeDataBase());
44 }
45 });
46 }
47
48 private static synchronized void initialize(TypeDataBase db) {
49 Type type = db.lookupType("CMSCollector");
50 markBitMapFieldOffset = type.getField("_markBitMap").getOffset();
51 }
52
53 //Accessing mark bitmap
54 public CMSBitMap markBitMap() {
55 return (CMSBitMap) VMObjectFactory.newObject(
56 CMSBitMap.class,
57 addr.addOffsetTo(markBitMapFieldOffset));
58 }
59
60 public long blockSizeUsingPrintezisBits(Address addr) {
61 CMSBitMap markBitMap = markBitMap();
62 long addressSize = VM.getVM().getAddressSize();
63 if ( markBitMap.isMarked(addr) && markBitMap.isMarked(addr.addOffsetTo(1*addressSize)) ) {
64 System.err.println("Printezis bits are set...");
65 Address nextOneAddr = markBitMap.getNextMarkedWordAddress(addr.addOffsetTo(2*addressSize));
66 //return size in bytes
67 long size = (nextOneAddr.addOffsetTo(1*addressSize)).minus(addr);
68 return size;
69 } else {
70 //missing Printezis marks
71 System.err.println("Missing Printszis marks...");
72 return -1;
73 }
74
75 }
76 }