Mercurial > hg > truffle
annotate agent/src/share/classes/sun/jvm/hotspot/tools/FinalizerInfo.java @ 1552:c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
Summary: Change all the Sun copyrights to Oracle copyright
Reviewed-by: ohair
| author | trims |
|---|---|
| date | Thu, 27 May 2010 19:08:38 -0700 |
| parents | a61af66fc99e |
| children | 63997f575155 |
| rev | line source |
|---|---|
| 0 | 1 /* |
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6941466: Oracle rebranding changes for Hotspot repositories
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2 * Copyright (c) 2004, 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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6941466: Oracle rebranding changes for Hotspot repositories
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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6941466: Oracle rebranding changes for Hotspot repositories
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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 | |
| 27 import sun.jvm.hotspot.tools.*; | |
| 28 | |
| 29 import sun.jvm.hotspot.oops.*; | |
| 30 import sun.jvm.hotspot.runtime.VM; | |
| 31 import sun.jvm.hotspot.utilities.SystemDictionaryHelper; | |
| 32 import sun.jvm.hotspot.utilities.ObjectReader; | |
| 33 import sun.jvm.hotspot.utilities.MarkBits; | |
| 34 | |
| 35 import java.util.HashMap; | |
| 36 import java.util.ArrayList; | |
| 37 import java.util.Collections; | |
| 38 import java.util.Comparator; | |
| 39 | |
| 40 /* | |
| 41 * Iterates over the queue of object pending finalization and prints a | |
| 42 * summary of these objects in the form of a histogram. | |
| 43 */ | |
| 44 public class FinalizerInfo extends Tool { | |
| 45 public static void main(String[] args) { | |
| 46 FinalizerInfo finfo = new FinalizerInfo(); | |
| 47 finfo.start(args); | |
| 48 finfo.stop(); | |
| 49 } | |
| 50 | |
| 51 public void run() { | |
| 52 /* | |
| 53 * The implementation here has a dependency on the implementation of | |
| 54 * java.lang.ref.Finalizer. If the Finalizer implementation changes it's | |
| 55 * possible this method will require changes too. We looked into using | |
| 56 * ObjectReader to deserialize the objects from the target VM but as | |
| 57 * there aren't any public methods to traverse the queue it means using | |
| 58 * reflection which will also tie us to the implementation. | |
| 59 * | |
| 60 * The assumption here is that Finalizer.queue is the ReferenceQueue | |
| 61 * with the objects awaiting finalization. The ReferenceQueue queueLength | |
| 62 * is the number of objects in the queue, and 'head' is the head of the | |
| 63 * queue. | |
| 64 */ | |
| 65 InstanceKlass ik = | |
| 66 SystemDictionaryHelper.findInstanceKlass("java.lang.ref.Finalizer"); | |
| 67 final OopField queueField[] = new OopField[1]; | |
| 68 ik.iterateFields(new DefaultOopVisitor() { | |
| 69 public void doOop(OopField field, boolean isVMField) { | |
| 70 String name = field.getID().getName(); | |
| 71 if (name.equals("queue")) { | |
| 72 queueField[0] = field; | |
| 73 } | |
| 74 } | |
| 75 }, false); | |
| 76 Oop queue = queueField[0].getValue(ik); | |
| 77 | |
| 78 InstanceKlass k = (InstanceKlass) queue.getKlass(); | |
| 79 | |
| 80 LongField queueLengthField = (LongField) k.findField("queueLength", "J"); | |
| 81 long queueLength = queueLengthField.getValue(queue); | |
| 82 | |
| 83 OopField headField = (OopField) k.findField("head", "Ljava/lang/ref/Reference;"); | |
| 84 Oop head = headField.getValue(queue); | |
| 85 | |
| 86 System.out.println("Number of objects pending for finalization: " + queueLength); | |
| 87 | |
| 88 /* | |
| 89 * If 'head' is non-NULL then it is the head of a list of References. | |
| 90 * We iterate over the list (end of list is when head.next == head) | |
| 91 */ | |
| 92 if (head != null) { | |
| 93 k = (InstanceKlass) head.getKlass(); | |
| 94 OopField referentField = | |
| 95 (OopField) k.findField("referent", "Ljava/lang/Object;"); | |
| 96 OopField nextField = | |
| 97 (OopField) k.findField("next", "Ljava/lang/ref/Reference;"); | |
| 98 | |
| 99 HashMap map = new HashMap(); | |
| 100 for (;;) { | |
| 101 Oop referent = referentField.getValue(head); | |
| 102 | |
| 103 Klass klass = referent.getKlass(); | |
| 104 if (!map.containsKey(klass)) { | |
| 105 map.put(klass, new ObjectHistogramElement(klass)); | |
| 106 } | |
| 107 ((ObjectHistogramElement)map.get(klass)).updateWith(referent); | |
| 108 | |
| 109 Oop next = nextField.getValue(head); | |
| 110 if (next == null || next.equals(head)) break; | |
| 111 head = next; | |
| 112 } | |
| 113 | |
| 114 /* | |
| 115 * Sort results - decending order by total size | |
| 116 */ | |
| 117 ArrayList list = new ArrayList(); | |
| 118 list.addAll(map.values()); | |
| 119 Collections.sort(list, new Comparator() { | |
| 120 public int compare(Object o1, Object o2) { | |
| 121 return ((ObjectHistogramElement)o1).compare((ObjectHistogramElement)o2); | |
| 122 } | |
| 123 }); | |
| 124 | |
| 125 /* | |
| 126 * Print summary of objects in queue | |
| 127 */ | |
| 128 System.out.println(""); | |
| 129 System.out.println("Count" + "\t" + "Class description"); | |
| 130 System.out.println("-------------------------------------------------------"); | |
| 131 for (int i=0; i<list.size(); i++) { | |
| 132 ObjectHistogramElement e = (ObjectHistogramElement)list.get(i); | |
| 133 System.out.println(e.getCount() + "\t" + e.getDescription()); | |
| 134 } | |
| 135 } | |
| 136 | |
| 137 } | |
| 138 } |