MonitorCacheDumpPanel.java revision 9883:903a2e023ffb 
1/*
2 * Copyright (c) 2002, 2007, 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.ui;
26
27import java.awt.*;
28import java.io.*;
29import javax.swing.*;
30import java.util.*;
31
32import sun.jvm.hotspot.memory.*;
33import sun.jvm.hotspot.runtime.*;
34import sun.jvm.hotspot.debugger.*;
35import sun.jvm.hotspot.oops.*;
36
37/** Provides information about monitor cache. */
38
39public class MonitorCacheDumpPanel extends JPanel {
40  public MonitorCacheDumpPanel() {
41    super();
42
43    setLayout(new BorderLayout());
44
45    // Simple at first
46    JScrollPane scroller = new JScrollPane();
47    JTextArea textArea = new JTextArea();
48    textArea = new JTextArea();
49    textArea.setEditable(false);
50    textArea.setLineWrap(true);
51    textArea.setWrapStyleWord(true);
52    scroller.getViewport().add(textArea);
53    add(scroller, BorderLayout.CENTER);
54
55    ByteArrayOutputStream bos = new ByteArrayOutputStream();
56    PrintStream tty = new PrintStream(bos);
57    tty.println("Monitor Cache Dump (not including JVMTI raw monitors):");
58    tty.println();
59    dumpOn(tty);
60
61    textArea.setText(bos.toString());
62  }
63
64  private static void dumpMonitor(PrintStream tty, ObjectMonitor mon, boolean raw) {
65    tty.print("ObjectMonitor@" + mon.getAddress());
66    if (raw) tty.print("(Raw Monitor)");
67    tty.println();
68    tty.println("  _header: 0x" + Long.toHexString(mon.header().value()));
69    OopHandle obj = mon.object();
70    Oop oop = heap.newOop(obj);
71    tty.println("  _object: " + obj + ", a " + oop.getKlass().getName().asString());
72    Address owner = mon.owner();
73    tty.println("  _owner: " + owner);
74    if (!raw && owner != null) {
75      JavaThread thread = threads.owningThreadFromMonitor(mon);
76      if (thread != null) {
77        tty.println("    owning thread: " + thread.getThreadName());
78        if (!thread.getAddress().equals(owner)) {
79          if (!thread.isLockOwned(owner)) {
80            tty.println("    WARNING! _owner doesn't fall in " + thread +
81                        "'s stack space");
82          }
83        }
84      }
85    }
86    tty.println("  _count: " + mon.count());
87    tty.println("  _waiters: " + mon.waiters());
88    tty.println("  _recursions: " + mon.recursions());
89  }
90
91  private void dumpOn(PrintStream tty) {
92    Iterator i = ObjectSynchronizer.objectMonitorIterator();
93    if (i == null) {
94      tty.println("This version of HotSpot VM doesn't support monitor cache dump.");
95      tty.println("You need 1.4.0_04, 1.4.1_01 or later versions");
96      return;
97    }
98    ObjectMonitor mon;
99    while (i.hasNext()) {
100      mon = (ObjectMonitor)i.next();
101      if (mon.count() != 0 || mon.waiters() != 0 || mon.owner() != null) {
102        OopHandle object = mon.object();
103        if (object == null) {
104          dumpMonitor(tty, mon, true);
105        } else {
106          dumpMonitor(tty, mon, false);
107        }
108      }
109    }
110  }
111
112  private static Threads threads = VM.getVM().getThreads();
113  private static ObjectHeap heap = VM.getVM().getObjectHeap();
114}
115