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comparison agent/src/share/classes/sun/jvm/hotspot/memory/FreeChunk.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 790e66e5fbac
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-1:000000000000 0:a61af66fc99e
1 /*
2 * Copyright 2003 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.util.*;
28 import sun.jvm.hotspot.debugger.*;
29 import sun.jvm.hotspot.types.*;
30 import sun.jvm.hotspot.runtime.*;
31
32 public class FreeChunk extends VMObject {
33 static {
34 VM.registerVMInitializedObserver(new Observer() {
35 public void update(Observable o, Object data) {
36 initialize(VM.getVM().getTypeDataBase());
37 }
38 });
39 }
40
41 private static synchronized void initialize(TypeDataBase db) {
42 Type type = db.lookupType("FreeChunk");
43 nextField = type.getAddressField("_next");
44 prevField = type.getAddressField("_prev");
45 sizeField = type.getCIntegerField("_size");
46 }
47
48 // Fields
49 private static AddressField nextField;
50 private static AddressField prevField;
51 private static CIntegerField sizeField;
52
53 // Accessors
54 public FreeChunk next() {
55 return (FreeChunk) VMObjectFactory.newObject(FreeChunk.class, nextField.getValue(addr));
56 }
57
58 public FreeChunk prev() {
59 Address prev = prevField.getValue(addr).andWithMask(~0x3);
60 return (FreeChunk) VMObjectFactory.newObject(FreeChunk.class, prev);
61 }
62
63 public long size() {
64 return sizeField.getValue(addr);
65 }
66
67 public FreeChunk(Address addr) {
68 super(addr);
69 }
70
71 public static boolean secondWordIndicatesFreeChunk(long word) {
72 return (word & 0x1L) == 0x1L;
73 }
74
75 public boolean isFree() {
76 Debugger dbg = VM.getVM().getDebugger();
77 Address prev = prevField.getValue(addr);
78 return secondWordIndicatesFreeChunk(dbg.getAddressValue(prev));
79 }
80 }