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1 /*
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2 * Copyright 2000-2002 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.runtime;
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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
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31 public class VirtualSpace extends VMObject {
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32 private static AddressField lowField;
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33 private static AddressField highField;
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34 private static AddressField lowBoundaryField;
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35 private static AddressField highBoundaryField;
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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("VirtualSpace");
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47
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48 lowField = type.getAddressField("_low");
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49 highField = type.getAddressField("_high");
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50 lowBoundaryField = type.getAddressField("_low_boundary");
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51 highBoundaryField = type.getAddressField("_high_boundary");
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52 }
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53
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54 public VirtualSpace(Address addr) {
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55 super(addr);
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56 }
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57
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58 public Address low() { return lowField.getValue(addr); }
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59 public Address high() { return highField.getValue(addr); }
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60 public Address lowBoundary() { return lowBoundaryField.getValue(addr); }
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61 public Address highBoundary() { return highBoundaryField.getValue(addr); }
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62
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63 /** Testers (all sizes are byte sizes) */
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64 public long committedSize() { return high().minus(low()); }
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65 public long reservedSize() { return highBoundary().minus(lowBoundary()); }
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66 public long uncommittedSize() { return reservedSize() - committedSize(); }
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67 public boolean contains(Address addr) { return (low().lessThanOrEqual(addr) && addr.lessThan(high())); }
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68 }
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