| /* |
| * Copyright (c) 2000, 2012, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| * |
| */ |
| |
| package sun.jvm.hotspot.oops; |
| |
| import java.io.*; |
| import java.util.*; |
| import sun.jvm.hotspot.memory.*; |
| import sun.jvm.hotspot.runtime.*; |
| |
| public class ObjectHistogramElement { |
| |
| private Klass klass; |
| private long count; // Number of instances of klass |
| private long size; // Total size of all these instances |
| |
| public ObjectHistogramElement(Klass k) { |
| klass = k; |
| count = 0; |
| size = 0; |
| } |
| |
| public void updateWith(Oop obj) { |
| count = count + 1; |
| size = size + obj.getObjectSize(); |
| } |
| |
| public int compare(ObjectHistogramElement other) { |
| return (int) (other.size - size); |
| } |
| |
| /** Klass for this ObjectHistogramElement */ |
| public Klass getKlass() { |
| return klass; |
| } |
| |
| /** Number of instances of klass */ |
| public long getCount() { |
| return count; |
| } |
| |
| /** Total size of all these instances */ |
| public long getSize() { |
| return size; |
| } |
| |
| private String getInternalName(Klass k) { |
| ByteArrayOutputStream bos = new ByteArrayOutputStream(); |
| getKlass().printValueOn(new PrintStream(bos)); |
| // '*' is used to denote VM internal klasses. |
| return "* " + bos.toString(); |
| } |
| |
| /** Human readable description **/ |
| public String getDescription() { |
| Klass k = getKlass(); |
| if (k instanceof InstanceKlass) { |
| return k.getName().asString().replace('/', '.'); |
| } else if (k instanceof ArrayKlass) { |
| ArrayKlass ak = (ArrayKlass) k; |
| if (k instanceof TypeArrayKlass) { |
| TypeArrayKlass tak = (TypeArrayKlass) ak; |
| return tak.getElementTypeName() + "[]"; |
| } else if (k instanceof ObjArrayKlass) { |
| ObjArrayKlass oak = (ObjArrayKlass) ak; |
| Klass bottom = oak.getBottomKlass(); |
| int dim = (int) oak.getDimension(); |
| StringBuffer buf = new StringBuffer(); |
| if (bottom instanceof TypeArrayKlass) { |
| buf.append(((TypeArrayKlass) bottom).getElementTypeName()); |
| } else if (bottom instanceof InstanceKlass) { |
| buf.append(bottom.getName().asString().replace('/', '.')); |
| } else { |
| throw new RuntimeException("should not reach here"); |
| } |
| for (int i=0; i < dim; i++) { |
| buf.append("[]"); |
| } |
| return buf.toString(); |
| } |
| } |
| return getInternalName(k); |
| } |
| |
| public static void titleOn(PrintStream tty) { |
| tty.println("Object Histogram:"); |
| tty.println(); |
| tty.println("num " + "\t" + " #instances" + "\t" + "#bytes" + "\t" + "Class description"); |
| tty.println("--------------------------------------------------------------------------"); |
| } |
| |
| public void printOn(PrintStream tty) { |
| tty.print(count + "\t" + size + "\t"); |
| tty.print(getDescription()); |
| tty.println(); |
| } |
| } |