Mercurial > hg > graal-jvmci-8
comparison agent/src/share/classes/sun/jvm/hotspot/memory/CMSCollector.java @ 0:a61af66fc99e jdk7-b24
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author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
parents | |
children | c18cbe5936b8 |
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-1:000000000000 | 0:a61af66fc99e |
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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 } |