1/*
2 * Copyright (c) 2000, 2004, 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.compiler;
26
27import java.util.*;
28
29import sun.jvm.hotspot.code.*;
30import sun.jvm.hotspot.debugger.*;
31import sun.jvm.hotspot.runtime.*;
32import sun.jvm.hotspot.types.*;
33
34public class ImmutableOopMap extends VMObject {
35  private static CIntegerField countField;
36  private static long classSize;
37
38  static {
39    VM.registerVMInitializedObserver(new Observer() {
40        public void update(Observable o, Object data) {
41          initialize(VM.getVM().getTypeDataBase());
42        }
43      });
44  }
45
46  private static void initialize(TypeDataBase db) {
47    Type type = db.lookupType("ImmutableOopMap");
48    countField = type.getCIntegerField("_count");
49    classSize = type.getSize();
50  }
51
52  public ImmutableOopMap(Address addr) {
53    super(addr);
54  }
55
56  //--------------------------------------------------------------------------------
57  // Internals only below this point
58  //
59
60  long getCount() {
61    return countField.getValue(addr);
62  }
63
64  public Address getData() {
65    return addr.addOffsetTo(classSize);
66  }
67}
68