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1 /*
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2 * Copyright 2001-2005 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.util.*;
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28 import sun.jvm.hotspot.debugger.*;
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29 import sun.jvm.hotspot.runtime.*;
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30 import sun.jvm.hotspot.types.*;
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31
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32 public class ConstantPoolCacheEntry {
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33 private static long size;
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34 private static long baseOffset;
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35 private static CIntegerField indices;
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36 private static sun.jvm.hotspot.types.OopField f1;
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37 private static CIntegerField f2;
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38 private static CIntegerField flags;
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39
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40 private ConstantPoolCache cp;
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41 private long offset;
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42
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43 static {
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44 VM.registerVMInitializedObserver(new Observer() {
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45 public void update(Observable o, Object data) {
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46 initialize(VM.getVM().getTypeDataBase());
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47 }
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48 });
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49 }
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50
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51 private static synchronized void initialize(TypeDataBase db) throws WrongTypeException {
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52 Type type = db.lookupType("ConstantPoolCacheEntry");
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53 size = type.getSize();
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54
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55 indices = type.getCIntegerField("_indices");
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56 f1 = type.getOopField ("_f1");
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57 f2 = type.getCIntegerField("_f2");
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58 flags = type.getCIntegerField("_flags");
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59
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60 type = db.lookupType("constantPoolCacheOopDesc");
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61 baseOffset = type.getSize();
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62 }
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63
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64 ConstantPoolCacheEntry(ConstantPoolCache cp, int index) {
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65 this.cp = cp;
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66 offset = baseOffset + index * size;
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67 }
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68
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69 public int getConstantPoolIndex() {
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70 return (int) (getIndices() & 0xFFFF);
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71 }
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72
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73 private long getIndices() {
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74 return cp.getHandle().getCIntegerAt(indices.getOffset() + offset, indices.getSize(), indices.isUnsigned());
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75 }
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76
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77 public Oop getF1() {
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78 return cp.getHeap().newOop(cp.getHandle().getOopHandleAt(f1.getOffset() + offset));
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79 }
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80
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81 public int getF2() {
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82 return cp.getHandle().getJIntAt(f1.getOffset() + offset);
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83 }
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84
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85 public int getFlags() {
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86 return cp.getHandle().getJIntAt(flags.getOffset() + offset);
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87 }
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88
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89 static NamedFieldIdentifier f1FieldName = new NamedFieldIdentifier("_f1");
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90 static NamedFieldIdentifier f2FieldName = new NamedFieldIdentifier("_f2");
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91 static NamedFieldIdentifier flagsFieldName = new NamedFieldIdentifier("_flags");
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92
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93 public void iterateFields(OopVisitor visitor) {
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94 visitor.doOop(new OopField(f1FieldName, f1.getOffset() + offset, true), true);
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95 visitor.doInt(new IntField(f2FieldName, f2.getOffset() + offset, true), true);
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96 visitor.doInt(new IntField(flagsFieldName, flags.getOffset() + offset, true), true);
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97 }
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98 }
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