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1 /*
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2 * Copyright 2000-2004 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.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 // ObjArrayKlass is the klass for ObjArrays
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35
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36 public class ObjArrayKlass extends ArrayKlass {
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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) throws WrongTypeException {
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46 Type type = db.lookupType("objArrayKlass");
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47 elementKlass = new OopField(type.getOopField("_element_klass"), Oop.getHeaderSize());
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48 bottomKlass = new OopField(type.getOopField("_bottom_klass"), Oop.getHeaderSize());
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49 }
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50
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51 ObjArrayKlass(OopHandle handle, ObjectHeap heap) {
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52 super(handle, heap);
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53 }
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54
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55 private static OopField elementKlass;
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56 private static OopField bottomKlass;
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57
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58 public Klass getElementKlass() { return (Klass) elementKlass.getValue(this); }
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59 public Klass getBottomKlass() { return (Klass) bottomKlass.getValue(this); }
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60
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61 public long computeModifierFlags() {
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62 long elementFlags = getElementKlass().computeModifierFlags();
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63 long arrayFlags = 0L;
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64 if ((elementFlags & (JVM_ACC_PUBLIC | JVM_ACC_PROTECTED)) != 0) {
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65 // The array type is public if the component type is public or protected
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66 arrayFlags = JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
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67 } else {
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68 // The array type is private if the component type is private
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69 arrayFlags = JVM_ACC_ABSTRACT | JVM_ACC_FINAL;
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70 }
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71 return arrayFlags;
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72 }
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73
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74 public void iterateFields(OopVisitor visitor, boolean doVMFields) {
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75 super.iterateFields(visitor, doVMFields);
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76 if (doVMFields) {
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77 visitor.doOop(elementKlass, true);
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78 visitor.doOop(bottomKlass, true);
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79 }
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80 }
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81
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82 public Klass arrayKlassImpl(boolean orNull, int n) {
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83 if (Assert.ASSERTS_ENABLED) {
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84 Assert.that(getDimension() <= n, "check order of chain");
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85 }
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86 int dimension = (int) getDimension();
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87 if (dimension == n) {
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88 return this;
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89 }
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90 ObjArrayKlass ak = (ObjArrayKlass) getHigherDimension();
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91 if (ak == null) {
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92 if (orNull) return null;
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93 // FIXME: would need to change in reflective system to actually
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94 // allocate klass
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95 throw new RuntimeException("Can not allocate array klasses in debugging system");
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96 }
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97
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98 if (orNull) {
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99 return ak.arrayKlassOrNull(n);
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100 }
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101 return ak.arrayKlass(n);
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102 }
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103
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104 public Klass arrayKlassImpl(boolean orNull) {
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105 return arrayKlassImpl(orNull, (int) (getDimension() + 1));
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106 }
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107
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108 public void printValueOn(PrintStream tty) {
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109 tty.print("ObjArrayKlass for ");
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110 getElementKlass().printValueOn(tty);
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111 }
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112 };
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