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1 /*
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2 * Copyright 2002-2007 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 package sun.jvm.hotspot.ui;
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26
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27 import java.awt.*;
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28 import java.io.*;
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29 import javax.swing.*;
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30 import java.util.*;
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31
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32 import sun.jvm.hotspot.memory.*;
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33 import sun.jvm.hotspot.runtime.*;
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34 import sun.jvm.hotspot.debugger.*;
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35 import sun.jvm.hotspot.oops.*;
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36
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37 /** Provides information about monitor cache. */
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38
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39 public class MonitorCacheDumpPanel extends JPanel {
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40 public MonitorCacheDumpPanel() {
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41 super();
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42
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43 setLayout(new BorderLayout());
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44
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45 // Simple at first
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46 JScrollPane scroller = new JScrollPane();
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47 JTextArea textArea = new JTextArea();
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48 textArea = new JTextArea();
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49 textArea.setEditable(false);
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50 textArea.setLineWrap(true);
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51 textArea.setWrapStyleWord(true);
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52 scroller.getViewport().add(textArea);
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53 add(scroller, BorderLayout.CENTER);
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54
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55 ByteArrayOutputStream bos = new ByteArrayOutputStream();
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56 PrintStream tty = new PrintStream(bos);
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57 tty.println("Monitor Cache Dump (not including JVMTI raw monitors):");
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58 tty.println();
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59 dumpOn(tty);
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60
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61 textArea.setText(bos.toString());
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62 }
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63
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64 private static void dumpMonitor(PrintStream tty, ObjectMonitor mon, boolean raw) {
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65 tty.print("ObjectMonitor@" + mon.getAddress());
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66 if (raw) tty.print("(Raw Monitor)");
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67 tty.println();
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68 tty.println(" _header: 0x" + Long.toHexString(mon.header().value()));
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69 OopHandle obj = mon.object();
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70 Oop oop = heap.newOop(obj);
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71 tty.println(" _object: " + obj + ", a " + oop.getKlass().getName().asString());
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72 Address owner = mon.owner();
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73 tty.println(" _owner: " + owner);
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74 if (!raw && owner != null) {
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75 JavaThread thread = threads.owningThreadFromMonitor(mon);
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76 if (thread != null) {
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77 tty.println(" owning thread: " + thread.getThreadName());
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78 if (!thread.getAddress().equals(owner)) {
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79 if (!thread.isLockOwned(owner)) {
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80 tty.println(" WARNING! _owner doesn't fall in " + thread +
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81 "'s stack space");
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82 }
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83 }
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84 }
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85 }
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86 tty.println(" _count: " + mon.count());
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87 tty.println(" _waiters: " + mon.waiters());
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88 tty.println(" _recursions: " + mon.recursions());
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89 }
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90
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91 private void dumpOn(PrintStream tty) {
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92 Iterator i = ObjectSynchronizer.objectMonitorIterator();
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93 if (i == null) {
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94 tty.println("This version of HotSpot VM doesn't support monitor cache dump.");
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95 tty.println("You need 1.4.0_04, 1.4.1_01 or later versions");
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96 return;
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97 }
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98 ObjectMonitor mon;
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99 while (i.hasNext()) {
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100 mon = (ObjectMonitor)i.next();
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101 if (mon.count() != 0 || mon.waiters() != 0 || mon.owner() != null) {
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102 OopHandle object = mon.object();
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103 if (object == null) {
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104 dumpMonitor(tty, mon, true);
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105 } else {
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106 dumpMonitor(tty, mon, false);
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107 }
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108 }
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109 }
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110 }
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111
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112 private static Threads threads = VM.getVM().getThreads();
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113 private static ObjectHeap heap = VM.getVM().getObjectHeap();
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114 }
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