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comparison agent/src/share/classes/sun/jvm/hotspot/oops/ObjectHistogramElement.java @ 0:a61af66fc99e jdk7-b24

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author duke
date Sat, 01 Dec 2007 00:00:00 +0000
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-1:000000000000 0:a61af66fc99e
1 /*
2 * Copyright 2000-2006 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
24
25 package sun.jvm.hotspot.oops;
26
27 import java.io.*;
28 import java.util.*;
29 import sun.jvm.hotspot.memory.*;
30 import sun.jvm.hotspot.runtime.*;
31
32 public class ObjectHistogramElement {
33
34 private Klass klass;
35 private long count; // Number of instances of klass
36 private long size; // Total size of all these instances
37
38 public ObjectHistogramElement(Klass k) {
39 klass = k;
40 count = 0;
41 size = 0;
42 }
43
44 public void updateWith(Oop obj) {
45 count = count + 1;
46 size = size + obj.getObjectSize();
47 }
48
49 public int compare(ObjectHistogramElement other) {
50 return (int) (other.size - size);
51 }
52
53 /** Klass for this ObjectHistogramElement */
54 public Klass getKlass() {
55 return klass;
56 }
57
58 /** Number of instances of klass */
59 public long getCount() {
60 return count;
61 }
62
63 /** Total size of all these instances */
64 public long getSize() {
65 return size;
66 }
67
68 private String getInternalName(Klass k) {
69 ByteArrayOutputStream bos = new ByteArrayOutputStream();
70 getKlass().printValueOn(new PrintStream(bos));
71 // '*' is used to denote VM internal klasses.
72 return "* " + bos.toString();
73 }
74
75 /** Human readable description **/
76 public String getDescription() {
77 Klass k = getKlass();
78 if (k instanceof InstanceKlass) {
79 return k.getName().asString().replace('/', '.');
80 } else if (k instanceof ArrayKlass) {
81 ArrayKlass ak = (ArrayKlass) k;
82 if (k instanceof TypeArrayKlass) {
83 TypeArrayKlass tak = (TypeArrayKlass) ak;
84 return tak.getElementTypeName() + "[]";
85 } else if (k instanceof ObjArrayKlass) {
86 ObjArrayKlass oak = (ObjArrayKlass) ak;
87 // See whether it's a "system objArray"
88 if (oak.equals(VM.getVM().getUniverse().systemObjArrayKlassObj())) {
89 return "* System ObjArray";
90 }
91 Klass bottom = oak.getBottomKlass();
92 int dim = (int) oak.getDimension();
93 StringBuffer buf = new StringBuffer();
94 if (bottom instanceof TypeArrayKlass) {
95 buf.append(((TypeArrayKlass) bottom).getElementTypeName());
96 } else if (bottom instanceof InstanceKlass) {
97 buf.append(bottom.getName().asString().replace('/', '.'));
98 } else {
99 throw new RuntimeException("should not reach here");
100 }
101 for (int i=0; i < dim; i++) {
102 buf.append("[]");
103 }
104 return buf.toString();
105 }
106 }
107 return getInternalName(k);
108 }
109
110 public static void titleOn(PrintStream tty) {
111 tty.println("Object Histogram:");
112 tty.println();
113 tty.println("Size" + "\t" + "Count" + "\t" + "Class description");
114 tty.println("-------------------------------------------------------");
115 }
116
117 public void printOn(PrintStream tty) {
118 tty.print(size + "\t" + count + "\t");
119 tty.print(getDescription());
120 tty.println();
121 }
122 }