Mercurial > hg > truffle
comparison agent/src/share/classes/sun/jvm/hotspot/memory/FreeChunk.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 | 790e66e5fbac |
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-1:000000000000 | 0:a61af66fc99e |
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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 } |