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1 /*
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2 * Copyright 2003 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.memory;
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26
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27 import java.util.*;
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28 import sun.jvm.hotspot.debugger.*;
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29 import sun.jvm.hotspot.types.*;
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30 import sun.jvm.hotspot.runtime.*;
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31
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32 public class FreeChunk extends VMObject {
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33 static {
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34 VM.registerVMInitializedObserver(new Observer() {
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35 public void update(Observable o, Object data) {
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36 initialize(VM.getVM().getTypeDataBase());
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37 }
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38 });
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39 }
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40
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41 private static synchronized void initialize(TypeDataBase db) {
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42 Type type = db.lookupType("FreeChunk");
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43 nextField = type.getAddressField("_next");
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44 prevField = type.getAddressField("_prev");
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45 sizeField = type.getCIntegerField("_size");
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46 }
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47
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48 // Fields
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49 private static AddressField nextField;
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50 private static AddressField prevField;
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51 private static CIntegerField sizeField;
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52
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53 // Accessors
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54 public FreeChunk next() {
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55 return (FreeChunk) VMObjectFactory.newObject(FreeChunk.class, nextField.getValue(addr));
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56 }
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57
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58 public FreeChunk prev() {
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59 Address prev = prevField.getValue(addr).andWithMask(~0x3);
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60 return (FreeChunk) VMObjectFactory.newObject(FreeChunk.class, prev);
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61 }
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62
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63 public long size() {
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64 return sizeField.getValue(addr);
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65 }
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66
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67 public FreeChunk(Address addr) {
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68 super(addr);
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69 }
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70
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71 public static boolean secondWordIndicatesFreeChunk(long word) {
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72 return (word & 0x1L) == 0x1L;
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73 }
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74
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75 public boolean isFree() {
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76 Debugger dbg = VM.getVM().getDebugger();
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77 Address prev = prevField.getValue(addr);
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78 return secondWordIndicatesFreeChunk(dbg.getAddressValue(prev));
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79 }
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80 }
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