0
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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 ConstantPool extends Array implements ClassConstants {
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38 // Used for debugging this code
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39 private static final boolean DEBUG = false;
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40
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41 protected void debugMessage(String message) {
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42 System.out.println(message);
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43 }
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44
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45 static {
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46 VM.registerVMInitializedObserver(new Observer() {
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47 public void update(Observable o, Object data) {
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48 initialize(VM.getVM().getTypeDataBase());
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49 }
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50 });
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51 }
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52
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53 private static synchronized void initialize(TypeDataBase db) throws WrongTypeException {
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54 Type type = db.lookupType("constantPoolOopDesc");
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55 tags = new OopField(type.getOopField("_tags"), 0);
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56 cache = new OopField(type.getOopField("_cache"), 0);
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57 poolHolder = new OopField(type.getOopField("_pool_holder"), 0);
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58 headerSize = type.getSize();
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59 elementSize = db.getOopSize();
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60 }
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61
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62 ConstantPool(OopHandle handle, ObjectHeap heap) {
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63 super(handle, heap);
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64 }
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65
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66 public boolean isConstantPool() { return true; }
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67
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68 private static OopField tags;
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69 private static OopField cache;
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70 private static OopField poolHolder;
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71
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72
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73 private static long headerSize;
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74 private static long elementSize;
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75
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76 public TypeArray getTags() { return (TypeArray) tags.getValue(this); }
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77 public ConstantPoolCache getCache() { return (ConstantPoolCache) cache.getValue(this); }
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78 public Klass getPoolHolder() { return (Klass) poolHolder.getValue(this); }
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79
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80 private long indexOffset(long index) {
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81 if (Assert.ASSERTS_ENABLED) {
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82 Assert.that(index > 0 && index < getLength(), "invalid cp index");
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83 }
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84 return (index * elementSize) + headerSize;
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85 }
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86
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87 public ConstantTag getTagAt(long index) {
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88 return new ConstantTag(getTags().getByteAt((int) index));
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89 }
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90
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91 public Oop getObjAt(long index){
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92 return getHeap().newOop(getHandle().getOopHandleAt(indexOffset(index)));
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93 }
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94
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95 public Symbol getSymbolAt(long index) {
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96 return (Symbol) getObjAt(index);
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97 }
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98
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99 public int getIntAt(long index){
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100 return getHandle().getJIntAt(indexOffset(index));
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101 }
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102
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103 public float getFloatAt(long index){
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104 return getHandle().getJFloatAt(indexOffset(index));
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105 }
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106
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107 public long getLongAt(long index) {
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108 int oneHalf = getHandle().getJIntAt(indexOffset(index + 1));
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109 int otherHalf = getHandle().getJIntAt(indexOffset(index));
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110 // buildLongFromIntsPD accepts higher address value, lower address value
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111 // in that order.
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112 return VM.getVM().buildLongFromIntsPD(oneHalf, otherHalf);
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113 }
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114
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115 public double getDoubleAt(long index) {
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116 return Double.longBitsToDouble(getLongAt(index));
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117 }
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118
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119 public int getFieldOrMethodAt(int which) {
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120 if (DEBUG) {
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121 System.err.print("ConstantPool.getFieldOrMethodAt(" + which + "): new index = ");
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122 }
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123 int i = -1;
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124 ConstantPoolCache cache = getCache();
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125 if (cache == null) {
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126 i = which;
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127 } else {
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128 // change byte-ordering and go via cache
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129 i = cache.getEntryAt(0xFFFF & VM.getVM().getBytes().swapShort((short) which)).getConstantPoolIndex();
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130 }
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131 if (Assert.ASSERTS_ENABLED) {
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132 Assert.that(getTagAt(i).isFieldOrMethod(), "Corrupted constant pool");
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133 }
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134 if (DEBUG) {
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135 System.err.println(i);
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136 }
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137 int res = getIntAt(i);
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138 if (DEBUG) {
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139 System.err.println("ConstantPool.getFieldOrMethodAt(" + i + "): result = " + res);
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140 }
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141 return res;
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142 }
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143
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144 public int getNameAndTypeAt(int which) {
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145 if (Assert.ASSERTS_ENABLED) {
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146 Assert.that(getTagAt(which).isNameAndType(), "Corrupted constant pool");
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147 }
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148 int i = getIntAt(which);
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149 if (DEBUG) {
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150 System.err.println("ConstantPool.getNameAndTypeAt(" + which + "): result = " + i);
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151 }
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152 return i;
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153 }
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154
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155 public Symbol getNameRefAt(int which) {
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156 int refIndex = getNameAndTypeAt(getNameAndTypeRefIndexAt(which));
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157 int nameIndex = extractLowShortFromInt(refIndex);
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158 return getSymbolAt(nameIndex);
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159 }
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160
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161 public Symbol getSignatureRefAt(int which) {
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162 int refIndex = getNameAndTypeAt(getNameAndTypeRefIndexAt(which));
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163 int sigIndex = extractHighShortFromInt(refIndex);
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164 return getSymbolAt(sigIndex);
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165 }
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166
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167 // returns null, if not resolved.
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168 public Klass getKlassRefAt(int which) {
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169 if( ! getTagAt(which).isKlass()) return null;
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170 return (Klass) getObjAt(which);
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171 }
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172
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173 // returns null, if not resolved.
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174 public InstanceKlass getFieldOrMethodKlassRefAt(int which) {
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175 int refIndex = getFieldOrMethodAt(which);
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176 int klassIndex = extractLowShortFromInt(refIndex);
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177 return (InstanceKlass) getKlassRefAt(klassIndex);
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178 }
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179
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180 // returns null, if not resolved.
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181 public Method getMethodRefAt(int which) {
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182 InstanceKlass klass = getFieldOrMethodKlassRefAt(which);
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183 if (klass == null) return null;
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184 Symbol name = getNameRefAt(which);
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185 Symbol sig = getSignatureRefAt(which);
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186 return klass.findMethod(name, sig);
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187 }
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188
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189 // returns null, if not resolved.
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190 public Field getFieldRefAt(int which) {
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191 InstanceKlass klass = getFieldOrMethodKlassRefAt(which);
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192 if (klass == null) return null;
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193 Symbol name = getNameRefAt(which);
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194 Symbol sig = getSignatureRefAt(which);
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195 return klass.findField(name, sig);
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196 }
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197
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198 public int getNameAndTypeRefIndexAt(int index) {
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199 int refIndex = getFieldOrMethodAt(index);
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200 if (DEBUG) {
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201 System.err.println("ConstantPool.getNameAndTypeRefIndexAt(" + index + "): refIndex = " + refIndex);
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202 }
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203 int i = extractHighShortFromInt(refIndex);
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204 if (DEBUG) {
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205 System.err.println("ConstantPool.getNameAndTypeRefIndexAt(" + index + "): result = " + i);
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206 }
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207 return i;
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208 }
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209
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210 /** Lookup for entries consisting of (name_index, signature_index) */
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211 public int getNameRefIndexAt(int index) {
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212 int refIndex = getNameAndTypeAt(index);
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213 if (DEBUG) {
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214 System.err.println("ConstantPool.getNameRefIndexAt(" + index + "): refIndex = " + refIndex);
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215 }
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216 int i = extractLowShortFromInt(refIndex);
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217 if (DEBUG) {
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218 System.err.println("ConstantPool.getNameRefIndexAt(" + index + "): result = " + i);
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219 }
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220 return i;
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221 }
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222
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223 /** Lookup for entries consisting of (name_index, signature_index) */
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224 public int getSignatureRefIndexAt(int index) {
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225 int refIndex = getNameAndTypeAt(index);
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226 if (DEBUG) {
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227 System.err.println("ConstantPool.getSignatureRefIndexAt(" + index + "): refIndex = " + refIndex);
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228 }
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229 int i = extractHighShortFromInt(refIndex);
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230 if (DEBUG) {
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231 System.err.println("ConstantPool.getSignatureRefIndexAt(" + index + "): result = " + i);
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232 }
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233 return i;
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234 }
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235
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236 final private static String[] nameForTag = new String[] {
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237 };
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238
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239 private String nameForTag(int tag) {
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240 switch (tag) {
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241 case JVM_CONSTANT_Utf8: return "JVM_CONSTANT_Utf8";
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242 case JVM_CONSTANT_Unicode: return "JVM_CONSTANT_Unicode";
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243 case JVM_CONSTANT_Integer: return "JVM_CONSTANT_Integer";
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244 case JVM_CONSTANT_Float: return "JVM_CONSTANT_Float";
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245 case JVM_CONSTANT_Long: return "JVM_CONSTANT_Long";
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246 case JVM_CONSTANT_Double: return "JVM_CONSTANT_Double";
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247 case JVM_CONSTANT_Class: return "JVM_CONSTANT_Class";
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248 case JVM_CONSTANT_String: return "JVM_CONSTANT_String";
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249 case JVM_CONSTANT_Fieldref: return "JVM_CONSTANT_Fieldref";
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250 case JVM_CONSTANT_Methodref: return "JVM_CONSTANT_Methodref";
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251 case JVM_CONSTANT_InterfaceMethodref: return "JVM_CONSTANT_InterfaceMethodref";
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252 case JVM_CONSTANT_NameAndType: return "JVM_CONSTANT_NameAndType";
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253 case JVM_CONSTANT_Invalid: return "JVM_CONSTANT_Invalid";
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254 case JVM_CONSTANT_UnresolvedClass: return "JVM_CONSTANT_UnresolvedClass";
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255 case JVM_CONSTANT_ClassIndex: return "JVM_CONSTANT_ClassIndex";
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256 case JVM_CONSTANT_UnresolvedString: return "JVM_CONSTANT_UnresolvedString";
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257 case JVM_CONSTANT_StringIndex: return "JVM_CONSTANT_StringIndex";
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258 }
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259 throw new InternalError("unknown tag");
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260 }
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261
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262 public void iterateFields(OopVisitor visitor, boolean doVMFields) {
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263 super.iterateFields(visitor, doVMFields);
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264 if (doVMFields) {
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265 visitor.doOop(tags, true);
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266 visitor.doOop(cache, true);
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267 visitor.doOop(poolHolder, true);
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268
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269 final int length = (int) getLength();
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270 // zero'th pool entry is always invalid. ignore it.
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271 for (int index = 1; index < length; index++) {
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272 int ctag = (int) getTags().getByteAt((int) index);
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273 switch (ctag) {
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274 case JVM_CONSTANT_ClassIndex:
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275 case JVM_CONSTANT_StringIndex:
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276 case JVM_CONSTANT_Integer:
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277 visitor.doInt(new IntField(new NamedFieldIdentifier(nameForTag(ctag)), indexOffset(index), true), true);
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278 break;
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279
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280 case JVM_CONSTANT_Float:
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281 visitor.doFloat(new FloatField(new NamedFieldIdentifier(nameForTag(ctag)), indexOffset(index), true), true);
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282 break;
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283
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284 case JVM_CONSTANT_Long:
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285 visitor.doLong(new LongField(new NamedFieldIdentifier(nameForTag(ctag)), indexOffset(index), true), true);
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286 // long entries occupy two slots
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287 index++;
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288 break;
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289
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290 case JVM_CONSTANT_Double:
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291 visitor.doDouble(new DoubleField(new NamedFieldIdentifier(nameForTag(ctag)), indexOffset(index), true), true);
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292 // double entries occupy two slots
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293 index++;
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294 break;
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295
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296 case JVM_CONSTANT_UnresolvedClass:
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297 case JVM_CONSTANT_Class:
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298 case JVM_CONSTANT_UnresolvedString:
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299 case JVM_CONSTANT_Utf8:
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300 visitor.doOop(new OopField(new NamedFieldIdentifier(nameForTag(ctag)), indexOffset(index), true), true);
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301 break;
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302
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303 case JVM_CONSTANT_Fieldref:
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304 case JVM_CONSTANT_Methodref:
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305 case JVM_CONSTANT_InterfaceMethodref:
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306 case JVM_CONSTANT_NameAndType:
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307 visitor.doInt(new IntField(new NamedFieldIdentifier(nameForTag(ctag)), indexOffset(index), true), true);
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308 break;
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309 }
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310 }
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311 }
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312 /*
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313 int length = getLength();
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314 for (int index = 0; index < length; index++) {
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315 long offset = baseOffset + (index + typeDataBase.getOopSize());
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316 visitor.doOop(new IndexableField(index, offset, false), getObjAt(index));
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317 }
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318 */
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319 }
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320
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321 public void writeBytes(OutputStream os) throws IOException {
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322 // Map between any modified UTF-8 and it's constant pool index.
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323 Map utf8ToIndex = new HashMap();
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324 DataOutputStream dos = new DataOutputStream(os);
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325 TypeArray tags = getTags();
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326 int len = (int)getLength();
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327 int ci = 0; // constant pool index
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328
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329 // collect all modified UTF-8 Strings from Constant Pool
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330
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331 for (ci = 1; ci < len; ci++) {
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332 byte cpConstType = tags.getByteAt(ci);
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333 if(cpConstType == JVM_CONSTANT_Utf8) {
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334 Symbol sym = getSymbolAt(ci);
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335 utf8ToIndex.put(sym.asString(), new Short((short) ci));
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336 }
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337 else if(cpConstType == JVM_CONSTANT_Long ||
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338 cpConstType == JVM_CONSTANT_Double) {
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339 ci++;
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340 }
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341 }
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342
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343
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344 for(ci = 1; ci < len; ci++) {
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345 int cpConstType = (int)tags.getByteAt(ci);
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346 // write cp_info
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347 // write constant type
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348 switch(cpConstType) {
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349 case JVM_CONSTANT_Utf8: {
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350 dos.writeByte(cpConstType);
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351 Symbol sym = getSymbolAt(ci);
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352 dos.writeShort((short)sym.getLength());
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353 dos.write(sym.asByteArray());
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354 if (DEBUG) debugMessage("CP[" + ci + "] = modified UTF-8 " + sym.asString());
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355 break;
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356 }
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357
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358 case JVM_CONSTANT_Unicode:
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359 throw new IllegalArgumentException("Unicode constant!");
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360
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361 case JVM_CONSTANT_Integer:
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362 dos.writeByte(cpConstType);
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363 dos.writeInt(getIntAt(ci));
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364 if (DEBUG) debugMessage("CP[" + ci + "] = int " + getIntAt(ci));
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365 break;
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366
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367 case JVM_CONSTANT_Float:
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368 dos.writeByte(cpConstType);
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369 dos.writeFloat(getFloatAt(ci));
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370 if (DEBUG) debugMessage("CP[" + ci + "] = float " + getFloatAt(ci));
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371 break;
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372
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373 case JVM_CONSTANT_Long: {
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374 dos.writeByte(cpConstType);
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375 long l = getLongAt(ci);
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376 // long entries occupy two pool entries
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377 ci++;
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378 dos.writeLong(l);
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379 break;
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380 }
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381
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382 case JVM_CONSTANT_Double:
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383 dos.writeByte(cpConstType);
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384 dos.writeDouble(getDoubleAt(ci));
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385 // double entries occupy two pool entries
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386 ci++;
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387 break;
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388
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389 case JVM_CONSTANT_Class: {
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390 dos.writeByte(cpConstType);
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391 // Klass already resolved. ConstantPool constains klassOop.
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392 Klass refKls = (Klass) getObjAt(ci);
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393 String klassName = refKls.getName().asString();
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394 Short s = (Short) utf8ToIndex.get(klassName);
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395 dos.writeShort(s.shortValue());
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396 if (DEBUG) debugMessage("CP[" + ci + "] = class " + s);
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397 break;
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398 }
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399
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400 // case JVM_CONSTANT_ClassIndex:
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401 case JVM_CONSTANT_UnresolvedClass: {
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402 dos.writeByte(JVM_CONSTANT_Class);
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403 String klassName = getSymbolAt(ci).asString();
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404 Short s = (Short) utf8ToIndex.get(klassName);
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405 dos.writeShort(s.shortValue());
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406 if (DEBUG) debugMessage("CP[" + ci + "] = class " + s);
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407 break;
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408 }
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409
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410 case JVM_CONSTANT_String: {
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411 dos.writeByte(cpConstType);
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412 String str = OopUtilities.stringOopToString(getObjAt(ci));
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413 Short s = (Short) utf8ToIndex.get(str);
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414 dos.writeShort(s.shortValue());
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415 if (DEBUG) debugMessage("CP[" + ci + "] = string " + s);
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416 break;
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417 }
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418
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419 // case JVM_CONSTANT_StringIndex:
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420 case JVM_CONSTANT_UnresolvedString: {
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421 dos.writeByte(JVM_CONSTANT_String);
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422 String val = getSymbolAt(ci).asString();
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423
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424 Short s = (Short) utf8ToIndex.get(val);
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425 dos.writeShort(s.shortValue());
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426 if (DEBUG) debugMessage("CP[" + ci + "] = string " + s);
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427 break;
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428 }
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429
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430 // all external, internal method/field references
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431 case JVM_CONSTANT_Fieldref:
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432 case JVM_CONSTANT_Methodref:
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433 case JVM_CONSTANT_InterfaceMethodref: {
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434 dos.writeByte(cpConstType);
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435 int value = getIntAt(ci);
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436 short klassIndex = (short) extractLowShortFromInt(value);
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437 short nameAndTypeIndex = (short) extractHighShortFromInt(value);
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438 dos.writeShort(klassIndex);
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439 dos.writeShort(nameAndTypeIndex);
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440 if (DEBUG) debugMessage("CP[" + ci + "] = ref klass = " +
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441 klassIndex + ", N&T = " + nameAndTypeIndex);
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442 break;
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443 }
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444
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445 case JVM_CONSTANT_NameAndType: {
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446 dos.writeByte(cpConstType);
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447 int value = getIntAt(ci);
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448 short nameIndex = (short) extractLowShortFromInt(value);
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449 short signatureIndex = (short) extractHighShortFromInt(value);
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450 dos.writeShort(nameIndex);
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451 dos.writeShort(signatureIndex);
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452 if (DEBUG) debugMessage("CP[" + ci + "] = N&T name = " + nameIndex
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453 + ", type = " + signatureIndex);
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454 break;
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455 }
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456 } // switch
|
|
457 }
|
|
458 dos.flush();
|
|
459 return;
|
|
460 }
|
|
461
|
|
462 public void printValueOn(PrintStream tty) {
|
|
463 tty.print("ConstantPool for " + getPoolHolder().getName().asString());
|
|
464 }
|
|
465
|
|
466 public long getObjectSize() {
|
|
467 return alignObjectSize(headerSize + (getLength() * elementSize));
|
|
468 }
|
|
469
|
|
470 //----------------------------------------------------------------------
|
|
471 // Internals only below this point
|
|
472 //
|
|
473
|
|
474 private static int extractHighShortFromInt(int val) {
|
|
475 return (val >> 16) & 0xFFFF;
|
|
476 }
|
|
477
|
|
478 private static int extractLowShortFromInt(int val) {
|
|
479 return val & 0xFFFF;
|
|
480 }
|
|
481 }
|