Mercurial > hg > truffle
annotate agent/src/share/classes/sun/jvm/hotspot/tools/FinalizerInfo.java @ 17524:89152779163c
Merge with jdk8-b132
| author | Gilles Duboscq <duboscq@ssw.jku.at> |
|---|---|
| date | Wed, 15 Oct 2014 11:59:32 +0200 |
| parents | 4ca6dc0799b6 |
| children |
| rev | line source |
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| 0 | 1 /* |
| 17524 | 2 * Copyright (c) 2004, 2013, Oracle and/or its affiliates. All rights reserved. |
| 0 | 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 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 25 package sun.jvm.hotspot.tools; | |
| 26 | |
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27 import sun.jvm.hotspot.debugger.JVMDebugger; |
| 0 | 28 import sun.jvm.hotspot.tools.*; |
| 29 | |
| 30 import sun.jvm.hotspot.oops.*; | |
| 31 import sun.jvm.hotspot.runtime.VM; | |
| 32 import sun.jvm.hotspot.utilities.SystemDictionaryHelper; | |
| 33 import sun.jvm.hotspot.utilities.ObjectReader; | |
| 34 import sun.jvm.hotspot.utilities.MarkBits; | |
| 35 | |
| 36 import java.util.HashMap; | |
| 37 import java.util.ArrayList; | |
| 38 import java.util.Collections; | |
| 39 import java.util.Comparator; | |
| 40 | |
| 41 /* | |
| 42 * Iterates over the queue of object pending finalization and prints a | |
| 43 * summary of these objects in the form of a histogram. | |
| 44 */ | |
| 45 public class FinalizerInfo extends Tool { | |
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46 |
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47 public FinalizerInfo() { |
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48 super(); |
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49 } |
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50 |
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51 public FinalizerInfo(JVMDebugger d) { |
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52 super(d); |
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53 } |
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54 |
| 0 | 55 public static void main(String[] args) { |
| 56 FinalizerInfo finfo = new FinalizerInfo(); | |
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57 finfo.execute(args); |
| 0 | 58 } |
| 59 | |
| 60 public void run() { | |
| 61 /* | |
| 62 * The implementation here has a dependency on the implementation of | |
| 63 * java.lang.ref.Finalizer. If the Finalizer implementation changes it's | |
| 64 * possible this method will require changes too. We looked into using | |
| 65 * ObjectReader to deserialize the objects from the target VM but as | |
| 66 * there aren't any public methods to traverse the queue it means using | |
| 67 * reflection which will also tie us to the implementation. | |
| 68 * | |
| 69 * The assumption here is that Finalizer.queue is the ReferenceQueue | |
| 70 * with the objects awaiting finalization. The ReferenceQueue queueLength | |
| 71 * is the number of objects in the queue, and 'head' is the head of the | |
| 72 * queue. | |
| 73 */ | |
| 74 InstanceKlass ik = | |
| 75 SystemDictionaryHelper.findInstanceKlass("java.lang.ref.Finalizer"); | |
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76 final Oop[] queueref = new Oop[1]; |
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77 ik.iterateStaticFields(new DefaultOopVisitor() { |
| 0 | 78 public void doOop(OopField field, boolean isVMField) { |
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79 String name = field.getID().getName(); |
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80 if (name.equals("queue")) { |
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81 queueref[0] = field.getValue(getObj()); |
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82 } |
| 0 | 83 } |
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84 }); |
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85 Oop queue = queueref[0]; |
| 0 | 86 |
| 87 InstanceKlass k = (InstanceKlass) queue.getKlass(); | |
| 88 | |
| 89 LongField queueLengthField = (LongField) k.findField("queueLength", "J"); | |
| 90 long queueLength = queueLengthField.getValue(queue); | |
| 91 | |
| 92 OopField headField = (OopField) k.findField("head", "Ljava/lang/ref/Reference;"); | |
| 93 Oop head = headField.getValue(queue); | |
| 94 | |
| 95 System.out.println("Number of objects pending for finalization: " + queueLength); | |
| 96 | |
| 97 /* | |
| 98 * If 'head' is non-NULL then it is the head of a list of References. | |
| 99 * We iterate over the list (end of list is when head.next == head) | |
| 100 */ | |
| 101 if (head != null) { | |
| 102 k = (InstanceKlass) head.getKlass(); | |
| 103 OopField referentField = | |
| 104 (OopField) k.findField("referent", "Ljava/lang/Object;"); | |
| 105 OopField nextField = | |
| 106 (OopField) k.findField("next", "Ljava/lang/ref/Reference;"); | |
| 107 | |
| 108 HashMap map = new HashMap(); | |
| 109 for (;;) { | |
| 110 Oop referent = referentField.getValue(head); | |
| 111 | |
| 112 Klass klass = referent.getKlass(); | |
| 113 if (!map.containsKey(klass)) { | |
| 114 map.put(klass, new ObjectHistogramElement(klass)); | |
| 115 } | |
| 116 ((ObjectHistogramElement)map.get(klass)).updateWith(referent); | |
| 117 | |
| 118 Oop next = nextField.getValue(head); | |
| 119 if (next == null || next.equals(head)) break; | |
| 120 head = next; | |
| 121 } | |
| 122 | |
| 123 /* | |
| 124 * Sort results - decending order by total size | |
| 125 */ | |
| 126 ArrayList list = new ArrayList(); | |
| 127 list.addAll(map.values()); | |
| 128 Collections.sort(list, new Comparator() { | |
| 129 public int compare(Object o1, Object o2) { | |
| 130 return ((ObjectHistogramElement)o1).compare((ObjectHistogramElement)o2); | |
| 131 } | |
| 132 }); | |
| 133 | |
| 134 /* | |
| 135 * Print summary of objects in queue | |
| 136 */ | |
| 137 System.out.println(""); | |
| 138 System.out.println("Count" + "\t" + "Class description"); | |
| 139 System.out.println("-------------------------------------------------------"); | |
| 140 for (int i=0; i<list.size(); i++) { | |
| 141 ObjectHistogramElement e = (ObjectHistogramElement)list.get(i); | |
| 142 System.out.println(e.getCount() + "\t" + e.getDescription()); | |
| 143 } | |
| 144 } | |
| 145 | |
| 146 } | |
| 147 } |