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1 /*
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2 * Copyright 2000-2004 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 public class ContiguousSpace extends CompactibleSpace {
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35 private static AddressField topField;
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36
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37 static {
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38 VM.registerVMInitializedObserver(new Observer() {
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39 public void update(Observable o, Object data) {
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40 initialize(VM.getVM().getTypeDataBase());
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41 }
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42 });
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43 }
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44
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45 private static synchronized void initialize(TypeDataBase db) {
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46 Type type = db.lookupType("ContiguousSpace");
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47
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48 topField = type.getAddressField("_top");
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49 }
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50
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51 public ContiguousSpace(Address addr) {
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52 super(addr);
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53 }
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54
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55 public Address top() {
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56 return topField.getValue(addr);
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57 }
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58
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59 /** In bytes */
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60 public long capacity() {
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61 return end().minus(bottom());
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62 }
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63
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64 /** In bytes */
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65 public long used() {
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66 return top().minus(bottom());
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67 }
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68
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69 /** In bytes */
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70 public long free() {
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71 return end().minus(top());
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72 }
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73
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74 /** In a contiguous space we have a more obvious bound on what parts
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75 contain objects. */
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76 public MemRegion usedRegion() {
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77 return new MemRegion(bottom(), top());
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78 }
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79
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80 /** Returns regions of Space where live objects live */
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81 public List/*<MemRegion>*/ getLiveRegions() {
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82 List res = new ArrayList();
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83 res.add(new MemRegion(bottom(), top()));
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84 return res;
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85 }
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86
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87 /** Testers */
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88 public boolean contains(Address p) {
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89 return (bottom().lessThanOrEqual(p) && top().greaterThan(p));
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90 }
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91
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92 public void printOn(PrintStream tty) {
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93 tty.print(" [" + bottom() + "," +
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94 top() + "," + end() + ")");
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95 super.printOn(tty);
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96 }
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97 }
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