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1 /*
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2 * Copyright 2000 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.io.*;
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28 import java.util.*;
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29
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30 import sun.jvm.hotspot.debugger.*;
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31 import sun.jvm.hotspot.runtime.*;
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32 import sun.jvm.hotspot.types.*;
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33
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34 /** <P> OneSpaceOldGeneration models a heap of old objects contained
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35 in a single contiguous space. </P>
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36
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37 <P> Garbage collection is performed using mark-compact. </P> */
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38
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39 public abstract class OneContigSpaceCardGeneration extends CardGeneration {
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40 private static AddressField theSpaceField;
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41
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42 static {
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43 VM.registerVMInitializedObserver(new Observer() {
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44 public void update(Observable o, Object data) {
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45 initialize(VM.getVM().getTypeDataBase());
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46 }
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47 });
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48 }
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49
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50 private static synchronized void initialize(TypeDataBase db) {
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51 Type type = db.lookupType("OneContigSpaceCardGeneration");
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52
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53 theSpaceField = type.getAddressField("_the_space");
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54 }
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55
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56 public OneContigSpaceCardGeneration(Address addr) {
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57 super(addr);
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58 }
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59
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60 public ContiguousSpace theSpace() {
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61 return (ContiguousSpace) VMObjectFactory.newObject(ContiguousSpace.class, theSpaceField.getValue(addr));
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62 }
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63
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64 public boolean isIn(Address p) {
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65 return theSpace().contains(p);
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66 }
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67
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68 /** Space queries */
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69 public long capacity() { return theSpace().capacity(); }
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70 public long used() { return theSpace().used(); }
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71 public long free() { return theSpace().free(); }
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72 public long contiguousAvailable() { return theSpace().free() + virtualSpace().uncommittedSize(); }
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73
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74 public void spaceIterate(SpaceClosure blk, boolean usedOnly) {
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75 blk.doSpace(theSpace());
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76 }
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77
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78 public void printOn(PrintStream tty) {
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79 tty.print(" old ");
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80 theSpace().printOn(tty);
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81 }
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82 }
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