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1 /*
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2 * Copyright 2001-2004 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.oops;
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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 import sun.jvm.hotspot.debugger.*;
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30 import sun.jvm.hotspot.interpreter.*;
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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 import sun.jvm.hotspot.utilities.*;
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34
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35 public class LocalVariableTableElement {
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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) throws WrongTypeException {
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45 Type type = db.lookupType("LocalVariableTableElement");
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46 offsetOfStartBCI = type.getCIntegerField("start_bci").getOffset();
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47 offsetOfLength = type.getCIntegerField("length").getOffset();
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48 offsetOfNameCPIndex = type.getCIntegerField("name_cp_index").getOffset();
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49 offsetOfDescriptorCPIndex = type.getCIntegerField("descriptor_cp_index").getOffset();
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50 offsetOfSignatureCPIndex = type.getCIntegerField("signature_cp_index").getOffset();
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51 offsetOfSlot = type.getCIntegerField("slot").getOffset();
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52 }
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53
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54 private static long offsetOfStartBCI;
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55 private static long offsetOfLength;
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56 private static long offsetOfNameCPIndex;
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57 private static long offsetOfDescriptorCPIndex;
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58 private static long offsetOfSignatureCPIndex;
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59 private static long offsetOfSlot;
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60
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61 private OopHandle handle;
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62 private long offset;
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63
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64 public LocalVariableTableElement(OopHandle handle, long offset) {
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65 this.handle = handle;
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66 this.offset = offset;
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67 }
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68
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69 public int getStartBCI() {
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70 return (int) handle.getCIntegerAt(offset + offsetOfStartBCI, 2, true);
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71 }
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72
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73 public int getLength() {
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74 return (int) handle.getCIntegerAt(offset + offsetOfLength, 2, true);
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75 }
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76
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77 public int getNameCPIndex() {
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78 return (int) handle.getCIntegerAt(offset + offsetOfNameCPIndex, 2, true);
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79 }
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80
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81 public int getDescriptorCPIndex() {
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82 return (int) handle.getCIntegerAt(offset + offsetOfDescriptorCPIndex, 2, true);
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83 }
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84
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85 public int getSignatureCPIndex() {
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86 return (int) handle.getCIntegerAt(offset + offsetOfSignatureCPIndex, 2, true);
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87 }
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88
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89 public int getSlot() {
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90 return (int) handle.getCIntegerAt(offset + offsetOfSlot, 2, true);
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91 }
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92 }
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