JNIid.java revision 9883:903a2e023ffb 
1/*
2 * Copyright (c) 2002, 2012, 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.runtime;
26
27import java.util.*;
28
29import sun.jvm.hotspot.debugger.*;
30import sun.jvm.hotspot.oops.*;
31import sun.jvm.hotspot.types.*;
32
33public class JNIid extends VMObject {
34  private static MetadataField holder;
35  private static AddressField next;
36  private static CIntegerField offset;
37  private static MetadataField resolvedMethod;
38  private static MetadataField resolvedReceiver;
39
40  private ObjectHeap heap;
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
52    // FIXME: JNIid has been removed as part of redesign of JNI method,
53    // field ID generation. Please refer to src/share/vm/prims/jniId.hpp/.cpp
54    // For now, commenting out the below code.
55
56    /***********************************************************
57    Type type = db.lookupType("JNIid");
58
59    holder = type.getOopField("_holder");
60    next = type.getAddressField("_next");
61    offset = type.getCIntegerField("_offset");
62    resolvedMethod = type.getOopField("_resolved_method");
63    resolvedReceiver = type.getOopField("_resolved_receiver");
64    ***********************************************************/
65  }
66
67  public JNIid(Address addr, ObjectHeap heap) {
68    super(addr);
69    this.heap = heap;
70  }
71
72  public JNIid next() {
73    Address nextAddr = next.getValue(addr);
74    if (nextAddr == null) {
75      return null;
76    }
77    return new JNIid(nextAddr, heap);
78  }
79
80  public Klass     holder()           { return (Klass) holder.getValue(addr); }
81  public int       offset()           { return (int) offset.getValue(addr); }
82  public Method    method() {
83    return ((InstanceKlass) holder()).getMethods().at(offset());
84  }
85  public Method    resolvedMethod()   { return (Method)resolvedMethod.getValue(addr); }
86  public Klass     resolvedReceiver() { return (Klass) resolvedReceiver.getValue(addr); }
87}
88