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1 /*
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2 * Copyright 2000-2006 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 package sun.jvm.hotspot.oops;
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26
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27 import java.io.*;
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28 import java.util.*;
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29 import sun.jvm.hotspot.memory.*;
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30 import sun.jvm.hotspot.runtime.*;
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31
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32 public class ObjectHistogramElement {
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33
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34 private Klass klass;
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35 private long count; // Number of instances of klass
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36 private long size; // Total size of all these instances
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37
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38 public ObjectHistogramElement(Klass k) {
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39 klass = k;
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40 count = 0;
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41 size = 0;
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42 }
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43
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44 public void updateWith(Oop obj) {
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45 count = count + 1;
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46 size = size + obj.getObjectSize();
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47 }
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48
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49 public int compare(ObjectHistogramElement other) {
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50 return (int) (other.size - size);
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51 }
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52
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53 /** Klass for this ObjectHistogramElement */
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54 public Klass getKlass() {
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55 return klass;
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56 }
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57
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58 /** Number of instances of klass */
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59 public long getCount() {
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60 return count;
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61 }
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62
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63 /** Total size of all these instances */
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64 public long getSize() {
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65 return size;
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66 }
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67
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68 private String getInternalName(Klass k) {
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69 ByteArrayOutputStream bos = new ByteArrayOutputStream();
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70 getKlass().printValueOn(new PrintStream(bos));
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71 // '*' is used to denote VM internal klasses.
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72 return "* " + bos.toString();
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73 }
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74
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75 /** Human readable description **/
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76 public String getDescription() {
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77 Klass k = getKlass();
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78 if (k instanceof InstanceKlass) {
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79 return k.getName().asString().replace('/', '.');
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80 } else if (k instanceof ArrayKlass) {
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81 ArrayKlass ak = (ArrayKlass) k;
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82 if (k instanceof TypeArrayKlass) {
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83 TypeArrayKlass tak = (TypeArrayKlass) ak;
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84 return tak.getElementTypeName() + "[]";
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85 } else if (k instanceof ObjArrayKlass) {
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86 ObjArrayKlass oak = (ObjArrayKlass) ak;
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87 // See whether it's a "system objArray"
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88 if (oak.equals(VM.getVM().getUniverse().systemObjArrayKlassObj())) {
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89 return "* System ObjArray";
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90 }
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91 Klass bottom = oak.getBottomKlass();
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92 int dim = (int) oak.getDimension();
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93 StringBuffer buf = new StringBuffer();
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94 if (bottom instanceof TypeArrayKlass) {
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95 buf.append(((TypeArrayKlass) bottom).getElementTypeName());
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96 } else if (bottom instanceof InstanceKlass) {
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97 buf.append(bottom.getName().asString().replace('/', '.'));
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98 } else {
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99 throw new RuntimeException("should not reach here");
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100 }
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101 for (int i=0; i < dim; i++) {
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102 buf.append("[]");
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103 }
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104 return buf.toString();
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105 }
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106 }
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107 return getInternalName(k);
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108 }
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109
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110 public static void titleOn(PrintStream tty) {
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111 tty.println("Object Histogram:");
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112 tty.println();
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113 tty.println("Size" + "\t" + "Count" + "\t" + "Class description");
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114 tty.println("-------------------------------------------------------");
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115 }
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116
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117 public void printOn(PrintStream tty) {
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118 tty.print(size + "\t" + count + "\t");
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119 tty.print(getDescription());
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120 tty.println();
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121 }
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122 }
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