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14909
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1 /*
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2 * @(#)FreeList.java
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3 *
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4 * Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved.
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5 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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6 *
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7 * This code is free software; you can redistribute it and/or modify it
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8 * under the terms of the GNU General Public License version 2 only, as
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9 * published by the Free Software Foundation.
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10 *
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11 * This code is distributed in the hope that it will be useful, but WITHOUT
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12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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14 * version 2 for more details (a copy is included in the LICENSE file that
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15 * accompanied this code).
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16 *
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17 * You should have received a copy of the GNU General Public License version
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18 * 2 along with this work; if not, write to the Free Software Foundation,
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19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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20 *
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21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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22 * or visit www.oracle.com if you need additional information or have any
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23 * questions.
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24 *
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25 */
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26
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27 package sun.jvm.hotspot.memory;
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28
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29 import java.util.*;
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30 import sun.jvm.hotspot.debugger.*;
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31 import sun.jvm.hotspot.types.*;
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32 import sun.jvm.hotspot.runtime.*;
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33
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34 public class FreeList extends VMObject {
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35 static {
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36 VM.registerVMInitializedObserver(new Observer() {
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37 public void update(Observable o, Object data) {
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38 initialize(VM.getVM().getTypeDataBase());
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39 }
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40 });
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41 }
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42
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43 private static synchronized void initialize(TypeDataBase db) {
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44 Type type = db.lookupType("FreeList<FreeChunk>");
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45 sizeField = type.getCIntegerField("_size");
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46 countField = type.getCIntegerField("_count");
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47 headerSize = type.getSize();
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48 }
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49
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50 // Fields
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51 private static CIntegerField sizeField;
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52 private static CIntegerField countField;
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53 private static long headerSize;
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54
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55 //Constructor
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56 public FreeList(Address address) {
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57 super(address);
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58 }
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59
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60 // Accessors
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61 public long size() {
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62 return sizeField.getValue(addr);
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63 }
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64
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65 public long count() {
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66 return countField.getValue(addr);
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67 }
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68
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69 public static long sizeOf() {
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70 return headerSize;
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71 }
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72 }
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