/*
 * Copyright (c) 2002, 2019, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
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 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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package sun.jvm.hotspot.ui;

import java.awt.*;
import java.io.*;
import javax.swing.*;
import java.util.*;

import sun.jvm.hotspot.memory.*;
import sun.jvm.hotspot.runtime.*;
import sun.jvm.hotspot.debugger.*;
import sun.jvm.hotspot.oops.*;

Provides information about monitor cache.
/** Provides information about monitor cache. */
public class MonitorCacheDumpPanel extends JPanel { public MonitorCacheDumpPanel() { super(); setLayout(new BorderLayout()); // Simple at first JScrollPane scroller = new JScrollPane(); JTextArea textArea = new JTextArea(); textArea = new JTextArea(); textArea.setEditable(false); textArea.setLineWrap(true); textArea.setWrapStyleWord(true); scroller.getViewport().add(textArea); add(scroller, BorderLayout.CENTER); ByteArrayOutputStream bos = new ByteArrayOutputStream(); PrintStream tty = new PrintStream(bos); tty.println("Monitor Cache Dump (not including JVMTI raw monitors):"); tty.println(); dumpOn(tty); textArea.setText(bos.toString()); } private static void dumpMonitor(PrintStream tty, ObjectMonitor mon, boolean raw) { tty.print("ObjectMonitor@" + mon.getAddress()); if (raw) tty.print("(Raw Monitor)"); tty.println(); tty.println(" _header: 0x" + Long.toHexString(mon.header().value())); OopHandle obj = mon.object(); Oop oop = heap.newOop(obj); tty.println(" _object: " + obj + ", a " + oop.getKlass().getName().asString()); Address owner = mon.owner(); tty.println(" _owner: " + owner); if (!raw && owner != null) { JavaThread thread = threads.owningThreadFromMonitor(mon); if (thread != null) { tty.println(" owning thread: " + thread.getThreadName()); if (!thread.getAddress().equals(owner)) { if (!thread.isLockOwned(owner)) { tty.println(" WARNING! _owner doesn't fall in " + thread + "'s stack space"); } } } } tty.println(" _contentions: " + mon.contentions()); tty.println(" _waiters: " + mon.waiters()); tty.println(" _recursions: " + mon.recursions()); } private void dumpOn(PrintStream tty) { Iterator i = ObjectSynchronizer.objectMonitorIterator(); if (i == null) { tty.println("This version of HotSpot VM doesn't support monitor cache dump."); tty.println("You need 1.4.0_04, 1.4.1_01 or later versions"); return; } ObjectMonitor mon; while (i.hasNext()) { mon = (ObjectMonitor)i.next(); if (mon.contentions() != 0 || mon.waiters() != 0 || mon.owner() != null) { OopHandle object = mon.object(); if (object == null) { dumpMonitor(tty, mon, true); } else { dumpMonitor(tty, mon, false); } } } } private static Threads threads = VM.getVM().getThreads(); private static ObjectHeap heap = VM.getVM().getObjectHeap(); }