Mercurial > hg > truffle
comparison agent/src/share/classes/sun/jvm/hotspot/memory/CompactibleSpace.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 /* | |
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 } |