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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 // A Symbol is a canonicalized string.
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35 // All Symbols reside in global symbolTable.
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36
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37 public class Symbol extends Oop {
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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("symbolOopDesc");
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48 length = new CIntField(type.getCIntegerField("_length"), 0);
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49 baseOffset = type.getField("_body").getOffset();
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50 }
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51
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52 // Format:
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53 // [header]
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54 // [klass ]
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55 // [length] byte size of uft8 string
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56 // ..body..
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57
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58 Symbol(OopHandle handle, ObjectHeap heap) {
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59 super(handle, heap);
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60 }
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61
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62 public boolean isSymbol() { return true; }
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63
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64 private static long baseOffset; // tells where the array part starts
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65
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66 // Fields
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67 private static CIntField length;
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68
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69 // Accessors for declared fields
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70 public long getLength() { return length.getValue(this); }
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71
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72 public byte getByteAt(long index) {
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73 return getHandle().getJByteAt(baseOffset + index);
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74 }
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75
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76 public boolean equals(byte[] modUTF8Chars) {
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77 int l = (int) getLength();
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78 if (l != modUTF8Chars.length) return false;
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79 while (l-- > 0) {
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80 if (modUTF8Chars[l] != getByteAt(l)) return false;
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81 }
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82 if (Assert.ASSERTS_ENABLED) {
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83 Assert.that(l == -1, "we should be at the beginning");
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84 }
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85 return true;
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86 }
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87
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88 public byte[] asByteArray() {
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89 int length = (int) getLength();
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90 byte [] result = new byte [length];
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91 for (int index = 0; index < length; index++) {
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92 result[index] = getByteAt(index);
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93 }
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94 return result;
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95 }
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96
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97 public String asString() {
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98 // Decode the byte array and return the string.
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99 try {
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100 return readModifiedUTF8(asByteArray());
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101 } catch(IOException e) {
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102 return null;
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103 }
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104 }
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105
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106 public boolean startsWith(String str) {
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107 return asString().startsWith(str);
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108 }
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109
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110 public void printValueOn(PrintStream tty) {
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111 tty.print("#" + asString());
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112 }
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113
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114 public long getObjectSize() {
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115 return alignObjectSize(baseOffset + getLength());
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116 }
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117
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118 void iterateFields(OopVisitor visitor, boolean doVMFields) {
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119 super.iterateFields(visitor, doVMFields);
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120 if (doVMFields) {
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121 visitor.doCInt(length, true);
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122 int length = (int) getLength();
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123 for (int index = 0; index < length; index++) {
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124 visitor.doByte(new ByteField(new IndexableFieldIdentifier(index), baseOffset + index, false), true);
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125 }
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126 }
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127 }
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128
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129 /** Note: this comparison is used for vtable sorting only; it
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130 doesn't matter what order it defines, as long as it is a total,
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131 time-invariant order Since symbolOops are in permSpace, their
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132 relative order in memory never changes, so use address
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133 comparison for speed. */
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134 public int fastCompare(Symbol other) {
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135 return (int) getHandle().minus(other.getHandle());
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136 }
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137
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138 private static String readModifiedUTF8(byte[] buf) throws IOException {
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139 final int len = buf.length;
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140 byte[] tmp = new byte[len + 2];
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141 // write modified UTF-8 length as short in big endian
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142 tmp[0] = (byte) ((len >>> 8) & 0xFF);
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143 tmp[1] = (byte) ((len >>> 0) & 0xFF);
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144 // copy the data
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145 System.arraycopy(buf, 0, tmp, 2, len);
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146 DataInputStream dis = new DataInputStream(new ByteArrayInputStream(tmp));
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147 return dis.readUTF();
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148 }
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149 }
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