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

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author duke
date Sat, 01 Dec 2007 00:00:00 +0000
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-1:000000000000 0:a61af66fc99e
1 /*
2 * Copyright 2002-2003 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.io.*;
28 import java.util.*;
29
30 import sun.jvm.hotspot.debugger.*;
31 import sun.jvm.hotspot.gc_interface.*;
32 import sun.jvm.hotspot.runtime.*;
33 import sun.jvm.hotspot.types.*;
34
35 public abstract class SharedHeap extends CollectedHeap {
36 private static AddressField permGenField;
37 private static VirtualConstructor ctor;
38
39 static {
40 VM.registerVMInitializedObserver(new Observer() {
41 public void update(Observable o, Object data) {
42 initialize(VM.getVM().getTypeDataBase());
43 }
44 });
45 }
46
47 private static synchronized void initialize(TypeDataBase db) {
48 Type type = db.lookupType("SharedHeap");
49 permGenField = type.getAddressField("_perm_gen");
50 ctor = new VirtualConstructor(db);
51 ctor.addMapping("CompactingPermGen", CompactingPermGen.class);
52 ctor.addMapping("CMSPermGen", CMSPermGen.class);
53
54 }
55
56 public SharedHeap(Address addr) {
57 super(addr);
58 }
59
60 /** These functions return the "permanent" generation, in which
61 reflective objects are allocated and stored. Two versions, the
62 second of which returns the view of the perm gen as a
63 generation. (FIXME: this distinction is strange and seems
64 unnecessary, and should be cleaned up.) */
65 public PermGen perm() {
66 return (PermGen) ctor.instantiateWrapperFor(permGenField.getValue(addr));
67 }
68
69 public CollectedHeapName kind() {
70 return CollectedHeapName.SHARED_HEAP;
71 }
72
73 public Generation permGen() {
74 return perm().asGen();
75 }
76 }