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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.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 JNIHandles {
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32 private static AddressField globalHandlesField;
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33 private static AddressField weakGlobalHandlesField;
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34 private static OopField deletedHandleField;
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35
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36 static {
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37 VM.registerVMInitializedObserver(new Observer() {
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38 public void update(Observable o, Object data) {
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39 initialize(VM.getVM().getTypeDataBase());
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40 }
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41 });
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42 }
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43
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44 private static synchronized void initialize(TypeDataBase db) {
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45 Type type = db.lookupType("JNIHandles");
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46
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47 globalHandlesField = type.getAddressField("_global_handles");
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48 weakGlobalHandlesField = type.getAddressField("_weak_global_handles");
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49 deletedHandleField = type.getOopField("_deleted_handle");
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50
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51 }
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52
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53 public JNIHandles() {
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54 }
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55
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56 public JNIHandleBlock globalHandles() {
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57 Address handleAddr = globalHandlesField.getValue();
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58 if (handleAddr == null) {
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59 return null;
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60 }
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61 return new JNIHandleBlock(handleAddr);
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62 }
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63
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64 public JNIHandleBlock weakGlobalHandles() {
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65 Address handleAddr = weakGlobalHandlesField.getValue();
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66 if (handleAddr == null) {
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67 return null;
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68 }
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69 return new JNIHandleBlock(handleAddr);
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70 }
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71
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72 public OopHandle deletedHandle() {
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73 return deletedHandleField.getValue();
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74 }
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75
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76 public boolean isDeletedHandle(OopHandle handle) {
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77 return (handle != null && handle.equals(deletedHandle()));
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78 }
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79
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80 }
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