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comparison agent/src/share/classes/sun/jvm/hotspot/memory/ProtectionDomainCacheEntry.java @ 12837:82af7d7a0128

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8003420: NPG: make new GC root for pd_set Summary: Move protection domain oops from system dictionary entries into a seperate set; the system dictionary references entries in that set now. This allows fast iteration during non-classunloading garbage collection. Implementation based on initial prototype from Ioi Lam (iklam). Reviewed-by: coleenp, iklam
author tschatzl
date Wed, 09 Oct 2013 10:57:01 +0200
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12836:b4d8a3d4db73 12837:82af7d7a0128
1 /*
2 * Copyright (c) 2001, 2013, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * 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.oops.*;
30 import sun.jvm.hotspot.runtime.*;
31 import sun.jvm.hotspot.types.*;
32
33 public class ProtectionDomainCacheEntry extends VMObject {
34 private static sun.jvm.hotspot.types.OopField protectionDomainField;
35
36 static {
37 VM.registerVMInitializedObserver(new Observer() {
38 public void update(Observable o, Object data) {
39 initialize(VM.getVM().getTypeDataBase());
40 }
41 });
42 }
43
44 private static synchronized void initialize(TypeDataBase db) {
45 Type type = db.lookupType("ProtectionDomainCacheEntry");
46 protectionDomainField = type.getOopField("_literal");
47 }
48
49 public ProtectionDomainCacheEntry(Address addr) {
50 super(addr);
51 }
52
53 public Oop protectionDomain() {
54 return VM.getVM().getObjectHeap().newOop(protectionDomainField.getValue(addr));
55 }
56 }