/*

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * 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).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 *

 */

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. */

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("  _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();

        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();

}