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

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author duke
date Sat, 01 Dec 2007 00:00:00 +0000
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1 /*
2 * Copyright 2000 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
29 import sun.jvm.hotspot.debugger.*;
30 import sun.jvm.hotspot.runtime.*;
31 import sun.jvm.hotspot.types.*;
32
33 /** A space that supports compaction operations. This is usually, but
34 not necessarily, a space that is normally contiguous. But, for
35 example, a free-list-based space whose normal collection is a
36 mark-sweep without compaction could still support compaction in
37 full GC's. */
38
39 public abstract class CompactibleSpace extends Space {
40 private static AddressField compactionTopField;
41
42 static {
43 VM.registerVMInitializedObserver(new Observer() {
44 public void update(Observable o, Object data) {
45 initialize(VM.getVM().getTypeDataBase());
46 }
47 });
48 }
49
50 private static synchronized void initialize(TypeDataBase db) {
51 Type type = db.lookupType("CompactibleSpace");
52
53 compactionTopField = type.getAddressField("_compaction_top");
54 }
55
56 public CompactibleSpace(Address addr) {
57 super(addr);
58 }
59
60 /** May be used temporarily during a compaction phase. */
61 public Address compactionTop() {
62 return compactionTopField.getValue(addr);
63 }
64 }