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1 /*
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2 * Copyright 2000-2005 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.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.runtime.*;
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31 import sun.jvm.hotspot.types.*;
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32 import sun.jvm.hotspot.utilities.*;
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33
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34 // A ConstantPool is an array containing class constants
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35 // as described in the class file
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36
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37 public class ConstantPoolCache extends Array {
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38 static {
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39 VM.registerVMInitializedObserver(new Observer() {
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40 public void update(Observable o, Object data) {
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41 initialize(VM.getVM().getTypeDataBase());
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42 }
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43 });
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44 }
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45
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46 private static synchronized void initialize(TypeDataBase db) throws WrongTypeException {
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47 Type type = db.lookupType("constantPoolCacheOopDesc");
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48 constants = new OopField(type.getOopField("_constant_pool"), 0);
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49 baseOffset = type.getSize();
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50
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51 Type elType = db.lookupType("ConstantPoolCacheEntry");
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52 elementSize = elType.getSize();
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53 }
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54
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55 ConstantPoolCache(OopHandle handle, ObjectHeap heap) {
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56 super(handle, heap);
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57 }
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58
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59 public boolean isConstantPoolCache() { return true; }
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60
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61 private static OopField constants;
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62
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63 private static long baseOffset;
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64 private static long elementSize;
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65
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66 public ConstantPool getConstants() { return (ConstantPool) constants.getValue(this); }
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67
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68 public long getObjectSize() {
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69 return alignObjectSize(baseOffset + getLength() * elementSize);
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70 }
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71
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72 public ConstantPoolCacheEntry getEntryAt(int i) {
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73 if (Assert.ASSERTS_ENABLED) {
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74 Assert.that(0 <= i && i < getLength(), "index out of bounds");
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75 }
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76 return new ConstantPoolCacheEntry(this, i);
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77 }
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78
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79 public int getIntAt(int entry, int fld) {
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80 //alignObjectSize ?
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81 long offset = baseOffset + /*alignObjectSize*/entry * elementSize + fld* getHeap().getIntSize();
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82 return (int) getHandle().getCIntegerAt(offset, getHeap().getIntSize(), true );
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83 }
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84
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85
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86 public void printValueOn(PrintStream tty) {
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87 tty.print("ConstantPoolCache for " + getConstants().getPoolHolder().getName().asString());
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88 }
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89
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90 public void iterateFields(OopVisitor visitor, boolean doVMFields) {
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91 super.iterateFields(visitor, doVMFields);
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92 if (doVMFields) {
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93 visitor.doOop(constants, true);
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94 for (int i = 0; i < getLength(); i++) {
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95 ConstantPoolCacheEntry entry = getEntryAt(i);
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96 entry.iterateFields(visitor);
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97 }
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98 }
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99 }
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100 };
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