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1 /*
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2 * Copyright 2000-2003 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
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29 import sun.jvm.hotspot.runtime.*;
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30
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31 // Super class for all fields in an object
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32 public class Field {
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33
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34 Field(FieldIdentifier id, long offset, boolean isVMField) {
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35 this.offset = offset;
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36 this.id = id;
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37 this.isVMField = isVMField;
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38 }
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39
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40 /** Constructor for fields that are named in an InstanceKlass's
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41 fields array (i.e., named, non-VM fields) */
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42 Field(InstanceKlass holder, int fieldArrayIndex) {
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43 this.holder = holder;
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44 this.fieldArrayIndex = fieldArrayIndex;
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45
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46 ConstantPool cp = holder.getConstants();
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47 TypeArray fields = holder.getFields();
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48 short access = fields.getShortAt(fieldArrayIndex + InstanceKlass.ACCESS_FLAGS_OFFSET);
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49 short nameIndex = fields.getShortAt(fieldArrayIndex + InstanceKlass.NAME_INDEX_OFFSET);
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50 short signatureIndex = fields.getShortAt(fieldArrayIndex + InstanceKlass.SIGNATURE_INDEX_OFFSET);
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51 offset = VM.getVM().buildIntFromShorts(fields.getShortAt(fieldArrayIndex + InstanceKlass.LOW_OFFSET),
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52 fields.getShortAt(fieldArrayIndex + InstanceKlass.HIGH_OFFSET));
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53 short genericSignatureIndex = fields.getShortAt(fieldArrayIndex + InstanceKlass.GENERIC_SIGNATURE_INDEX_OFFSET);
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54 Symbol name = cp.getSymbolAt(nameIndex);
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55 id = new NamedFieldIdentifier(name.asString());
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56 signature = cp.getSymbolAt(signatureIndex);
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57 if (genericSignatureIndex != 0) {
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58 genericSignature = cp.getSymbolAt(genericSignatureIndex);
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59 } else {
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60 genericSignature = null;
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61 }
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62
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63 fieldType = new FieldType(signature);
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64 accessFlags = new AccessFlags(access);
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65 }
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66
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67 private long offset;
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68 private FieldIdentifier id;
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69 private boolean isVMField;
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70 // Java fields only
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71 private InstanceKlass holder;
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72 private FieldType fieldType;
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73 private Symbol signature;
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74 private Symbol genericSignature;
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75 private AccessFlags accessFlags;
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76 private int fieldArrayIndex;
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77
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78 /** Returns the byte offset of the field within the object or klass */
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79 public long getOffset() { return offset; }
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80
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81 /** Returns the identifier of the field */
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82 public FieldIdentifier getID() { return id; }
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83
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84 /** Indicates whether this is a VM field */
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85 public boolean isVMField() { return isVMField; }
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86
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87 /** Indicates whether this is a named field */
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88 public boolean isNamedField() { return (id instanceof NamedFieldIdentifier); }
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89
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90 public void printOn(PrintStream tty) {
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91 getID().printOn(tty);
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92 tty.print(" {" + getOffset() + "} :");
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93 }
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94
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95 /** (Named, non-VM fields only) Returns the InstanceKlass containing
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96 this (static or non-static) field. */
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97 public InstanceKlass getFieldHolder() {
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98 return holder;
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99 }
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100
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101 /** (Named, non-VM fields only) Returns the index in the fields
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102 TypeArray for this field. Equivalent to the "index" in the VM's
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103 fieldDescriptors. */
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104 public int getFieldArrayIndex() {
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105 return fieldArrayIndex;
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106 }
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107
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108 /** (Named, non-VM fields only) Retrieves the access flags. */
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109 public long getAccessFlags() { return accessFlags.getValue(); }
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110 public AccessFlags getAccessFlagsObj() { return accessFlags; }
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111
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112 /** (Named, non-VM fields only) Returns the type of this field. */
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113 public FieldType getFieldType() { return fieldType; }
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114
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115 /** (Named, non-VM fields only) Returns the signature of this
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116 field. */
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117 public Symbol getSignature() { return signature; }
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118 public Symbol getGenericSignature() { return genericSignature; }
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119
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120 //
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121 // Following acccessors are for named, non-VM fields only
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122 //
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123 public boolean isPublic() { return accessFlags.isPublic(); }
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124 public boolean isPrivate() { return accessFlags.isPrivate(); }
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125 public boolean isProtected() { return accessFlags.isProtected(); }
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126 public boolean isPackagePrivate() { return !isPublic() && !isPrivate() && !isProtected(); }
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127
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128 public boolean isStatic() { return accessFlags.isStatic(); }
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129 public boolean isFinal() { return accessFlags.isFinal(); }
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130 public boolean isVolatile() { return accessFlags.isVolatile(); }
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131 public boolean isTransient() { return accessFlags.isTransient(); }
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132
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133 public boolean isSynthetic() { return accessFlags.isSynthetic(); }
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134 public boolean isEnumConstant() { return accessFlags.isEnum(); }
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135
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136 public boolean equals(Object obj) {
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137 if (obj == null) {
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138 return false;
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139 }
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140
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141 if (! (obj instanceof Field)) {
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142 return false;
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143 }
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144
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145 Field other = (Field) obj;
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146 return this.getFieldHolder().equals(other.getFieldHolder()) &&
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147 this.getID().equals(other.getID());
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148 }
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149
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150 public int hashCode() {
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151 return getFieldHolder().hashCode() ^ getID().hashCode();
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152 }
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153 }
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