1 /* 2 * Copyright (c) 2002, 2019, 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.ui; 26 27 import java.awt.*; 28 import java.io.*; 29 import javax.swing.*; 30 import java.util.*; 31 32 import sun.jvm.hotspot.memory.*; 33 import sun.jvm.hotspot.runtime.*; 34 import sun.jvm.hotspot.debugger.*; 35 import sun.jvm.hotspot.oops.*; 36 37 /** Provides information about monitor cache. */ 38 39 public 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(" _contentions: " + mon.contentions()); 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.contentions() != 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 }