HeapRegionSetBase.java revision 9883:903a2e023ffb 
1/*
2 * Copyright (c) 2012, 2015, 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
25package sun.jvm.hotspot.gc.g1;
26
27import java.util.Iterator;
28import java.util.Observable;
29import java.util.Observer;
30
31import sun.jvm.hotspot.debugger.Address;
32import sun.jvm.hotspot.runtime.VM;
33import sun.jvm.hotspot.runtime.VMObject;
34import sun.jvm.hotspot.runtime.VMObjectFactory;
35import sun.jvm.hotspot.types.AddressField;
36import sun.jvm.hotspot.types.CIntegerField;
37import sun.jvm.hotspot.types.Type;
38import sun.jvm.hotspot.types.TypeDataBase;
39
40// Mirror class for HeapRegionSetBase. Represents a group of regions.
41
42public class HeapRegionSetBase extends VMObject {
43
44    // uint _length
45    static private CIntegerField lengthField;
46
47    static {
48        VM.registerVMInitializedObserver(new Observer() {
49                public void update(Observable o, Object data) {
50                    initialize(VM.getVM().getTypeDataBase());
51                }
52            });
53    }
54
55    static private synchronized void initialize(TypeDataBase db) {
56        Type type = db.lookupType("HeapRegionSetBase");
57
58        lengthField = type.getCIntegerField("_length");
59    }
60
61    public long length() {
62        return lengthField.getValue(addr);
63    }
64
65    public HeapRegionSetBase(Address addr) {
66        super(addr);
67    }
68}
69