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1 /*
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2 * Copyright 2000-2007 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.utilities.*;
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30 import sun.jvm.hotspot.debugger.*;
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31 import sun.jvm.hotspot.memory.*;
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32 import sun.jvm.hotspot.runtime.*;
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33 import sun.jvm.hotspot.types.*;
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34
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35 // ArrayKlass is the abstract class for all array classes
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36
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37 public class ArrayKlass extends Klass {
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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("arrayKlass");
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48 dimension = new CIntField(type.getCIntegerField("_dimension"), Oop.getHeaderSize());
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49 higherDimension = new OopField(type.getOopField("_higher_dimension"), Oop.getHeaderSize());
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50 lowerDimension = new OopField(type.getOopField("_lower_dimension"), Oop.getHeaderSize());
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51 vtableLen = new CIntField(type.getCIntegerField("_vtable_len"), Oop.getHeaderSize());
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52 allocSize = new CIntField(type.getCIntegerField("_alloc_size"), Oop.getHeaderSize());
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53 componentMirror = new OopField(type.getOopField("_component_mirror"), Oop.getHeaderSize());
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54 javaLangCloneableName = null;
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55 javaLangObjectName = null;
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56 javaIoSerializableName = null;
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57 }
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58
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59 ArrayKlass(OopHandle handle, ObjectHeap heap) {
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60 super(handle, heap);
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61 }
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62
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63 private static CIntField dimension;
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64 private static OopField higherDimension;
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65 private static OopField lowerDimension;
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66 private static CIntField vtableLen;
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67 private static CIntField allocSize;
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68 private static OopField componentMirror;
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69
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70 public Klass getJavaSuper() {
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71 SystemDictionary sysDict = VM.getVM().getSystemDictionary();
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72 return sysDict.getObjectKlass();
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73 }
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74
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75 public long getDimension() { return dimension.getValue(this); }
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76 public Klass getHigherDimension() { return (Klass) higherDimension.getValue(this); }
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77 public Klass getLowerDimension() { return (Klass) lowerDimension.getValue(this); }
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78 public long getVtableLen() { return vtableLen.getValue(this); }
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79 public long getAllocSize() { return allocSize.getValue(this); }
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80 public Oop getComponentMirror() { return componentMirror.getValue(this); }
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81
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82 // constant class names - javaLangCloneable, javaIoSerializable, javaLangObject
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83 // Initialized lazily to avoid initialization ordering dependencies between ArrayKlass and SymbolTable
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84 private static Symbol javaLangCloneableName;
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85 private static Symbol javaLangObjectName;
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86 private static Symbol javaIoSerializableName;
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87 private static Symbol javaLangCloneableName() {
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88 if (javaLangCloneableName == null) {
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89 javaLangCloneableName = VM.getVM().getSymbolTable().probe("java/lang/Cloneable");
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90 }
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91 return javaLangCloneableName;
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92 }
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93
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94 private static Symbol javaLangObjectName() {
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95 if (javaLangObjectName == null) {
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96 javaLangObjectName = VM.getVM().getSymbolTable().probe("java/lang/Object");
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97 }
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98 return javaLangObjectName;
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99 }
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100
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101 private static Symbol javaIoSerializableName() {
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102 if (javaIoSerializableName == null) {
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103 javaIoSerializableName = VM.getVM().getSymbolTable().probe("java/io/Serializable");
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104 }
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105 return javaIoSerializableName;
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106 }
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107
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108 public int getClassStatus() {
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109 return JVMDIClassStatus.VERIFIED | JVMDIClassStatus.PREPARED | JVMDIClassStatus.INITIALIZED;
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110 }
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111
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112 public long computeModifierFlags() {
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113 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
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114 }
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115
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116 public long getArrayHeaderInBytes() {
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117 return Bits.maskBits(getLayoutHelper() >> LH_HEADER_SIZE_SHIFT, 0xFF);
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118 }
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119
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120 public int getLog2ElementSize() {
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121 return Bits.maskBits(getLayoutHelper() >> LH_LOG2_ELEMENT_SIZE_SHIFT, 0xFF);
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122 }
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123
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124 public int getElementType() {
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125 return Bits.maskBits(getLayoutHelper() >> LH_ELEMENT_TYPE_SHIFT, 0xFF);
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126 }
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127
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128 boolean computeSubtypeOf(Klass k) {
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129 // An array is a subtype of Serializable, Clonable, and Object
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130 Symbol name = k.getName();
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131 if (name != null && (name.equals(javaIoSerializableName()) ||
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132 name.equals(javaLangCloneableName()) ||
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133 name.equals(javaLangObjectName()))) {
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134 return true;
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135 } else {
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136 return false;
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137 }
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138 }
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139
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140 public void printValueOn(PrintStream tty) {
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141 tty.print("ArrayKlass");
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142 }
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143
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144 public long getObjectSize() {
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145 return alignObjectSize(InstanceKlass.getHeaderSize() + getVtableLen() * getHeap().getOopSize());
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146 }
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147
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148 public void iterateFields(OopVisitor visitor, boolean doVMFields) {
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149 super.iterateFields(visitor, doVMFields);
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150 if (doVMFields) {
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151 visitor.doCInt(dimension, true);
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152 visitor.doOop(higherDimension, true);
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153 visitor.doOop(lowerDimension, true);
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154 visitor.doCInt(vtableLen, true);
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155 visitor.doCInt(allocSize, true);
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156 visitor.doOop(componentMirror, true);
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157 }
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158 }
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159 }
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