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comparison agent/src/share/classes/sun/jvm/hotspot/runtime/vmSymbols.java @ 3962:cb315dc80374

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7092278: "jmap -finalizerinfo" throws "sun.jvm.hotspot.utilities.AssertionFailure: invalid cp index 0 137" Reviewed-by: kvn
author never
date Thu, 29 Sep 2011 09:53:56 -0700
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3961:a92cdbac8b9e 3962:cb315dc80374
1 /*
2 * Copyright (c) 2011, 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.runtime;
26
27 import java.io.*;
28 import java.util.*;
29 import sun.jvm.hotspot.debugger.*;
30 import sun.jvm.hotspot.memory.*;
31 import sun.jvm.hotspot.oops.*;
32 import sun.jvm.hotspot.runtime.*;
33 import sun.jvm.hotspot.types.*;
34 import sun.jvm.hotspot.utilities.*;
35
36
37 public class vmSymbols {
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 Address symbolsAddress;
47 private static int FIRST_SID;
48 private static int SID_LIMIT;
49
50 private static synchronized void initialize(TypeDataBase db) throws WrongTypeException {
51 Type type = db.lookupType("vmSymbols");
52 symbolsAddress = type.getAddressField("_symbols[0]").getStaticFieldAddress();
53 FIRST_SID = db.lookupIntConstant("vmSymbols::FIRST_SID");
54 SID_LIMIT = db.lookupIntConstant("vmSymbols::SID_LIMIT");
55 }
56
57 public static Symbol symbolAt(int id) {
58 if (id < FIRST_SID || id >= SID_LIMIT) throw new IndexOutOfBoundsException("bad SID " + id);
59 return Symbol.create(symbolsAddress.getAddressAt(id * VM.getVM().getAddressSize()));
60 }
61 }