1 /* 2 * @(#)FreeList.java 3 * 4 * Copyright (c) 2000, 2008, Oracle and/or its affiliates. All rights reserved. 5 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 6 * 7 * This code is free software; you can redistribute it and/or modify it 8 * under the terms of the GNU General Public License version 2 only, as 9 * published by the Free Software Foundation. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 * 25 */ 26 27 package sun.jvm.hotspot.memory; 28 29 import java.util.*; 30 import sun.jvm.hotspot.debugger.*; 31 import sun.jvm.hotspot.types.*; 32 import sun.jvm.hotspot.runtime.*; 33 34 public class FreeList extends VMObject { 35 static { 36 VM.registerVMInitializedObserver(new Observer() { 37 public void update(Observable o, Object data) { 38 initialize(VM.getVM().getTypeDataBase()); 39 } 40 }); 41 } 42 43 private static synchronized void initialize(TypeDataBase db) { 44 Type type = db.lookupType("FreeList"); 45 sizeField = type.getCIntegerField("_size"); 46 countField = type.getCIntegerField("_count"); 47 headerSize = type.getSize(); 48 } 49 50 // Fields 51 private static CIntegerField sizeField; 52 private static CIntegerField countField; 53 private static long headerSize; 54 55 //Constructor 56 public FreeList(Address address) { 57 super(address); 58 } 59 60 // Accessors 61 public long size() { 62 return sizeField.getValue(addr); 63 } 64 65 public long count() { 66 return countField.getValue(addr); 67 } 68 69 public static long sizeOf() { 70 return headerSize; 71 } 72 }