1 /* |
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2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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3 * |
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4 * This code is free software; you can redistribute it and/or modify it |
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5 * under the terms of the GNU General Public License version 2 only, as |
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6 * published by the Free Software Foundation. Oracle designates this |
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7 * particular file as subject to the "Classpath" exception as provided |
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8 * by Oracle in the LICENSE file that accompanied this code. |
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9 * |
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10 * This code is distributed in the hope that it will be useful, but WITHOUT |
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11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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13 * version 2 for more details (a copy is included in the LICENSE file that |
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14 * accompanied this code). |
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15 * |
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16 * You should have received a copy of the GNU General Public License version |
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17 * 2 along with this work; if not, write to the Free Software Foundation, |
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18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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19 * |
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20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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21 * or visit www.oracle.com if you need additional information or have any |
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22 * questions. |
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23 */ |
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24 |
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25 /* |
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26 * This file is available under and governed by the GNU General Public |
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27 * License version 2 only, as published by the Free Software Foundation. |
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28 * However, the following notice accompanied the original version of this |
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29 * file: |
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30 * |
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31 * ASM: a very small and fast Java bytecode manipulation framework |
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32 * Copyright (c) 2000-2011 INRIA, France Telecom |
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33 * All rights reserved. |
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34 * |
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35 * Redistribution and use in source and binary forms, with or without |
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36 * modification, are permitted provided that the following conditions |
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37 * are met: |
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38 * 1. Redistributions of source code must retain the above copyright |
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39 * notice, this list of conditions and the following disclaimer. |
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40 * 2. Redistributions in binary form must reproduce the above copyright |
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41 * notice, this list of conditions and the following disclaimer in the |
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42 * documentation and/or other materials provided with the distribution. |
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43 * 3. Neither the name of the copyright holders nor the names of its |
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44 * contributors may be used to endorse or promote products derived from |
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45 * this software without specific prior written permission. |
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46 * |
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47 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
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48 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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49 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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50 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE |
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51 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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52 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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53 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
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54 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
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55 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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56 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF |
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57 * THE POSSIBILITY OF SUCH DAMAGE. |
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58 */ |
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59 package jdk.internal.org.objectweb.asm; |
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60 |
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61 /** |
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62 * A constant pool item. Constant pool items can be created with the 'newXXX' |
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63 * methods in the {@link ClassWriter} class. |
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64 * |
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65 * @author Eric Bruneton |
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66 */ |
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67 final class Item { |
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68 |
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69 /** |
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70 * Index of this item in the constant pool. |
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71 */ |
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72 int index; |
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73 |
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74 /** |
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75 * Type of this constant pool item. A single class is used to represent all |
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76 * constant pool item types, in order to minimize the bytecode size of this |
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77 * package. The value of this field is one of {@link ClassWriter#INT}, |
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78 * {@link ClassWriter#LONG}, {@link ClassWriter#FLOAT}, |
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79 * {@link ClassWriter#DOUBLE}, {@link ClassWriter#UTF8}, |
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80 * {@link ClassWriter#STR}, {@link ClassWriter#CLASS}, |
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81 * {@link ClassWriter#NAME_TYPE}, {@link ClassWriter#FIELD}, |
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82 * {@link ClassWriter#METH}, {@link ClassWriter#IMETH}, |
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83 * {@link ClassWriter#MODULE}, {@link ClassWriter#PACKAGE}, |
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84 * {@link ClassWriter#MTYPE}, {@link ClassWriter#INDY}. |
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85 * |
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86 * MethodHandle constant 9 variations are stored using a range of 9 values |
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87 * from {@link ClassWriter#HANDLE_BASE} + 1 to |
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88 * {@link ClassWriter#HANDLE_BASE} + 9. |
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89 * |
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90 * Special Item types are used for Items that are stored in the ClassWriter |
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91 * {@link ClassWriter#typeTable}, instead of the constant pool, in order to |
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92 * avoid clashes with normal constant pool items in the ClassWriter constant |
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93 * pool's hash table. These special item types are |
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94 * {@link ClassWriter#TYPE_NORMAL}, {@link ClassWriter#TYPE_UNINIT} and |
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95 * {@link ClassWriter#TYPE_MERGED}. |
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96 */ |
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97 int type; |
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98 |
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99 /** |
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100 * Value of this item, for an integer item. |
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101 */ |
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102 int intVal; |
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103 |
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104 /** |
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105 * Value of this item, for a long item. |
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106 */ |
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107 long longVal; |
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108 |
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109 /** |
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110 * First part of the value of this item, for items that do not hold a |
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111 * primitive value. |
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112 */ |
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113 String strVal1; |
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114 |
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115 /** |
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116 * Second part of the value of this item, for items that do not hold a |
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117 * primitive value. |
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118 */ |
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119 String strVal2; |
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120 |
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121 /** |
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122 * Third part of the value of this item, for items that do not hold a |
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123 * primitive value. |
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124 */ |
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125 String strVal3; |
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126 |
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127 /** |
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128 * The hash code value of this constant pool item. |
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129 */ |
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130 int hashCode; |
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131 |
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132 /** |
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133 * Link to another constant pool item, used for collision lists in the |
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134 * constant pool's hash table. |
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135 */ |
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136 Item next; |
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137 |
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138 /** |
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139 * Constructs an uninitialized {@link Item}. |
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140 */ |
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141 Item() { |
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142 } |
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143 |
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144 /** |
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145 * Constructs an uninitialized {@link Item} for constant pool element at |
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146 * given position. |
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147 * |
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148 * @param index |
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149 * index of the item to be constructed. |
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150 */ |
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151 Item(final int index) { |
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152 this.index = index; |
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153 } |
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154 |
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155 /** |
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156 * Constructs a copy of the given item. |
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157 * |
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158 * @param index |
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159 * index of the item to be constructed. |
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160 * @param i |
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161 * the item that must be copied into the item to be constructed. |
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162 */ |
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163 Item(final int index, final Item i) { |
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164 this.index = index; |
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165 type = i.type; |
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166 intVal = i.intVal; |
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167 longVal = i.longVal; |
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168 strVal1 = i.strVal1; |
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169 strVal2 = i.strVal2; |
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170 strVal3 = i.strVal3; |
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171 hashCode = i.hashCode; |
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172 } |
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173 |
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174 /** |
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175 * Sets this item to an integer item. |
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176 * |
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177 * @param intVal |
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178 * the value of this item. |
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179 */ |
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180 void set(final int intVal) { |
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181 this.type = ClassWriter.INT; |
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182 this.intVal = intVal; |
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183 this.hashCode = 0x7FFFFFFF & (type + intVal); |
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184 } |
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185 |
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186 /** |
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187 * Sets this item to a long item. |
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188 * |
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189 * @param longVal |
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190 * the value of this item. |
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191 */ |
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192 void set(final long longVal) { |
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193 this.type = ClassWriter.LONG; |
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194 this.longVal = longVal; |
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195 this.hashCode = 0x7FFFFFFF & (type + (int) longVal); |
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196 } |
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197 |
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198 /** |
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199 * Sets this item to a float item. |
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200 * |
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201 * @param floatVal |
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202 * the value of this item. |
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203 */ |
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204 void set(final float floatVal) { |
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205 this.type = ClassWriter.FLOAT; |
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206 this.intVal = Float.floatToRawIntBits(floatVal); |
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207 this.hashCode = 0x7FFFFFFF & (type + (int) floatVal); |
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208 } |
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209 |
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210 /** |
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211 * Sets this item to a double item. |
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212 * |
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213 * @param doubleVal |
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214 * the value of this item. |
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215 */ |
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216 void set(final double doubleVal) { |
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217 this.type = ClassWriter.DOUBLE; |
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218 this.longVal = Double.doubleToRawLongBits(doubleVal); |
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219 this.hashCode = 0x7FFFFFFF & (type + (int) doubleVal); |
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220 } |
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221 |
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222 /** |
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223 * Sets this item to an item that do not hold a primitive value. |
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224 * |
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225 * @param type |
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226 * the type of this item. |
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227 * @param strVal1 |
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228 * first part of the value of this item. |
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229 * @param strVal2 |
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230 * second part of the value of this item. |
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231 * @param strVal3 |
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232 * third part of the value of this item. |
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233 */ |
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234 @SuppressWarnings("fallthrough") |
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235 void set(final int type, final String strVal1, final String strVal2, |
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236 final String strVal3) { |
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237 this.type = type; |
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238 this.strVal1 = strVal1; |
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239 this.strVal2 = strVal2; |
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240 this.strVal3 = strVal3; |
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241 switch (type) { |
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242 case ClassWriter.CLASS: |
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243 this.intVal = 0; // intVal of a class must be zero, see visitInnerClass |
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244 case ClassWriter.UTF8: |
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245 case ClassWriter.STR: |
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246 case ClassWriter.MTYPE: |
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247 case ClassWriter.MODULE: |
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248 case ClassWriter.PACKAGE: |
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249 case ClassWriter.TYPE_NORMAL: |
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250 hashCode = 0x7FFFFFFF & (type + strVal1.hashCode()); |
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251 return; |
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252 case ClassWriter.NAME_TYPE: { |
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253 hashCode = 0x7FFFFFFF & (type + strVal1.hashCode() |
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254 * strVal2.hashCode()); |
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255 return; |
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256 } |
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257 // ClassWriter.FIELD: |
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258 // ClassWriter.METH: |
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259 // ClassWriter.IMETH: |
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260 // ClassWriter.HANDLE_BASE + 1..9 |
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261 default: |
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262 hashCode = 0x7FFFFFFF & (type + strVal1.hashCode() |
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263 * strVal2.hashCode() * strVal3.hashCode()); |
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264 } |
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265 } |
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266 |
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267 /** |
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268 * Sets the item to an InvokeDynamic item. |
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269 * |
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270 * @param name |
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271 * invokedynamic's name. |
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272 * @param desc |
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273 * invokedynamic's desc. |
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274 * @param bsmIndex |
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275 * zero based index into the class attribute BootrapMethods. |
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276 */ |
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277 void set(String name, String desc, int bsmIndex) { |
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278 this.type = ClassWriter.INDY; |
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279 this.longVal = bsmIndex; |
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280 this.strVal1 = name; |
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281 this.strVal2 = desc; |
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282 this.hashCode = 0x7FFFFFFF & (ClassWriter.INDY + bsmIndex |
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283 * strVal1.hashCode() * strVal2.hashCode()); |
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284 } |
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285 |
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286 /** |
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287 * Sets the item to a BootstrapMethod item. |
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288 * |
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289 * @param position |
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290 * position in byte in the class attribute BootrapMethods. |
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291 * @param hashCode |
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292 * hashcode of the item. This hashcode is processed from the |
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293 * hashcode of the bootstrap method and the hashcode of all |
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294 * bootstrap arguments. |
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295 */ |
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296 void set(int position, int hashCode) { |
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297 this.type = ClassWriter.BSM; |
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298 this.intVal = position; |
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299 this.hashCode = hashCode; |
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300 } |
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301 |
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302 /** |
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303 * Indicates if the given item is equal to this one. <i>This method assumes |
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304 * that the two items have the same {@link #type}</i>. |
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305 * |
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306 * @param i |
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307 * the item to be compared to this one. Both items must have the |
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308 * same {@link #type}. |
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309 * @return <tt>true</tt> if the given item if equal to this one, |
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310 * <tt>false</tt> otherwise. |
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311 */ |
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312 boolean isEqualTo(final Item i) { |
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313 switch (type) { |
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314 case ClassWriter.UTF8: |
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315 case ClassWriter.STR: |
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316 case ClassWriter.CLASS: |
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317 case ClassWriter.MODULE: |
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318 case ClassWriter.PACKAGE: |
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319 case ClassWriter.MTYPE: |
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320 case ClassWriter.TYPE_NORMAL: |
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321 return i.strVal1.equals(strVal1); |
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322 case ClassWriter.TYPE_MERGED: |
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323 case ClassWriter.LONG: |
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324 case ClassWriter.DOUBLE: |
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325 return i.longVal == longVal; |
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326 case ClassWriter.INT: |
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327 case ClassWriter.FLOAT: |
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328 return i.intVal == intVal; |
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329 case ClassWriter.TYPE_UNINIT: |
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330 return i.intVal == intVal && i.strVal1.equals(strVal1); |
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331 case ClassWriter.NAME_TYPE: |
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332 return i.strVal1.equals(strVal1) && i.strVal2.equals(strVal2); |
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333 case ClassWriter.INDY: { |
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334 return i.longVal == longVal && i.strVal1.equals(strVal1) |
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335 && i.strVal2.equals(strVal2); |
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336 } |
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337 // case ClassWriter.FIELD: |
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338 // case ClassWriter.METH: |
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339 // case ClassWriter.IMETH: |
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340 // case ClassWriter.HANDLE_BASE + 1..9 |
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341 default: |
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342 return i.strVal1.equals(strVal1) && i.strVal2.equals(strVal2) |
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343 && i.strVal3.equals(strVal3); |
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344 } |
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345 } |
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346 |
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347 } |
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