1 /* |
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2 * Copyright (c) 2000, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * 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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