1 /* |
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2 * Copyright (c) 2000, 2002, 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.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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