1 /* |
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2 * Copyright (c) 2008, 2012, Oracle and/or its affiliates. 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. Oracle designates this |
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8 * particular file as subject to the "Classpath" exception as provided |
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9 * by Oracle in the LICENSE file that accompanied this code. |
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10 * |
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11 * This code is distributed in the hope that it will be useful, but WITHOUT |
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12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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14 * version 2 for more details (a copy is included in the LICENSE file that |
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15 * accompanied this code). |
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16 * |
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17 * You should have received a copy of the GNU General Public License version |
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18 * 2 along with this work; if not, write to the Free Software Foundation, |
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19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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20 * |
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21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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22 * or visit www.oracle.com if you need additional information or have any |
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23 * questions. |
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24 */ |
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25 |
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26 package com.sun.tools.classfile; |
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27 |
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28 import java.util.Map; |
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29 |
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30 import com.sun.tools.classfile.ConstantPool.CONSTANT_Class_info; |
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31 import com.sun.tools.classfile.ConstantPool.CONSTANT_Double_info; |
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32 import com.sun.tools.classfile.ConstantPool.CONSTANT_Fieldref_info; |
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33 import com.sun.tools.classfile.ConstantPool.CONSTANT_Float_info; |
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34 import com.sun.tools.classfile.ConstantPool.CONSTANT_Integer_info; |
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35 import com.sun.tools.classfile.ConstantPool.CONSTANT_InterfaceMethodref_info; |
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36 import com.sun.tools.classfile.ConstantPool.CONSTANT_InvokeDynamic_info; |
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37 import com.sun.tools.classfile.ConstantPool.CONSTANT_Long_info; |
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38 import com.sun.tools.classfile.ConstantPool.CONSTANT_MethodHandle_info; |
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39 import com.sun.tools.classfile.ConstantPool.CONSTANT_MethodType_info; |
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40 import com.sun.tools.classfile.ConstantPool.CONSTANT_Methodref_info; |
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41 import com.sun.tools.classfile.ConstantPool.CONSTANT_NameAndType_info; |
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42 import com.sun.tools.classfile.ConstantPool.CONSTANT_String_info; |
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43 import com.sun.tools.classfile.ConstantPool.CONSTANT_Utf8_info; |
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44 import com.sun.tools.classfile.ConstantPool.CPInfo; |
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45 |
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46 /** |
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47 * Rewrites a class file using a map of translations. |
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48 * |
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49 * <p><b>This is NOT part of any supported API. |
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50 * If you write code that depends on this, you do so at your own risk. |
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51 * This code and its internal interfaces are subject to change or |
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52 * deletion without notice.</b> |
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53 */ |
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54 public class ClassTranslator |
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55 implements ConstantPool.Visitor<ConstantPool.CPInfo,Map<Object,Object>> { |
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56 /** |
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57 * Create a new ClassFile from {@code cf}, such that for all entries |
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58 * {@code k -\> v} in {@code translations}, |
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59 * each occurrence of {@code k} in {@code cf} will be replaced by {@code v}. |
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60 * in |
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61 * @param cf the class file to be processed |
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62 * @param translations the set of translations to be applied |
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63 * @return a copy of {@code} with the values in {@code translations} substituted |
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64 */ |
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65 public ClassFile translate(ClassFile cf, Map<Object,Object> translations) { |
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66 ClassFile cf2 = (ClassFile) translations.get(cf); |
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67 if (cf2 == null) { |
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68 ConstantPool constant_pool2 = translate(cf.constant_pool, translations); |
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69 Field[] fields2 = translate(cf.fields, cf.constant_pool, translations); |
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70 Method[] methods2 = translateMethods(cf.methods, cf.constant_pool, translations); |
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71 Attributes attributes2 = translateAttributes(cf.attributes, cf.constant_pool, |
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72 translations); |
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73 |
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74 if (constant_pool2 == cf.constant_pool && |
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75 fields2 == cf.fields && |
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76 methods2 == cf.methods && |
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77 attributes2 == cf.attributes) |
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78 cf2 = cf; |
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79 else |
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80 cf2 = new ClassFile( |
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81 cf.magic, |
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82 cf.minor_version, |
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83 cf.major_version, |
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84 constant_pool2, |
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85 cf.access_flags, |
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86 cf.this_class, |
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87 cf.super_class, |
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88 cf.interfaces, |
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89 fields2, |
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90 methods2, |
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91 attributes2); |
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92 translations.put(cf, cf2); |
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93 } |
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94 return cf2; |
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95 } |
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96 |
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97 ConstantPool translate(ConstantPool cp, Map<Object,Object> translations) { |
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98 ConstantPool cp2 = (ConstantPool) translations.get(cp); |
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99 if (cp2 == null) { |
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100 ConstantPool.CPInfo[] pool2 = new ConstantPool.CPInfo[cp.size()]; |
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101 boolean eq = true; |
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102 for (int i = 0; i < cp.size(); ) { |
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103 ConstantPool.CPInfo cpInfo; |
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104 try { |
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105 cpInfo = cp.get(i); |
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106 } catch (ConstantPool.InvalidIndex e) { |
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107 throw new IllegalStateException(e); |
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108 } |
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109 ConstantPool.CPInfo cpInfo2 = translate(cpInfo, translations); |
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110 eq &= (cpInfo == cpInfo2); |
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111 pool2[i] = cpInfo2; |
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112 if (cpInfo.getTag() != cpInfo2.getTag()) |
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113 throw new IllegalStateException(); |
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114 i += cpInfo.size(); |
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115 } |
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116 |
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117 if (eq) |
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118 cp2 = cp; |
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119 else |
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120 cp2 = new ConstantPool(pool2); |
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121 |
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122 translations.put(cp, cp2); |
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123 } |
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124 return cp2; |
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125 } |
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126 |
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127 ConstantPool.CPInfo translate(ConstantPool.CPInfo cpInfo, Map<Object,Object> translations) { |
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128 ConstantPool.CPInfo cpInfo2 = (ConstantPool.CPInfo) translations.get(cpInfo); |
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129 if (cpInfo2 == null) { |
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130 cpInfo2 = cpInfo.accept(this, translations); |
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131 translations.put(cpInfo, cpInfo2); |
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132 } |
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133 return cpInfo2; |
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134 } |
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135 |
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136 Field[] translate(Field[] fields, ConstantPool constant_pool, Map<Object,Object> translations) { |
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137 Field[] fields2 = (Field[]) translations.get(fields); |
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138 if (fields2 == null) { |
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139 fields2 = new Field[fields.length]; |
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140 for (int i = 0; i < fields.length; i++) |
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141 fields2[i] = translate(fields[i], constant_pool, translations); |
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142 if (equal(fields, fields2)) |
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143 fields2 = fields; |
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144 translations.put(fields, fields2); |
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145 } |
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146 return fields2; |
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147 } |
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148 |
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149 Field translate(Field field, ConstantPool constant_pool, Map<Object,Object> translations) { |
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150 Field field2 = (Field) translations.get(field); |
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151 if (field2 == null) { |
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152 Attributes attributes2 = translateAttributes(field.attributes, constant_pool, |
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153 translations); |
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154 |
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155 if (attributes2 == field.attributes) |
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156 field2 = field; |
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157 else |
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158 field2 = new Field( |
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159 field.access_flags, |
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160 field.name_index, |
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161 field.descriptor, |
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162 attributes2); |
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163 translations.put(field, field2); |
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164 } |
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165 return field2; |
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166 } |
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167 |
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168 Method[] translateMethods(Method[] methods, ConstantPool constant_pool, Map<Object,Object> translations) { |
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169 Method[] methods2 = (Method[]) translations.get(methods); |
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170 if (methods2 == null) { |
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171 methods2 = new Method[methods.length]; |
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172 for (int i = 0; i < methods.length; i++) |
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173 methods2[i] = translate(methods[i], constant_pool, translations); |
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174 if (equal(methods, methods2)) |
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175 methods2 = methods; |
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176 translations.put(methods, methods2); |
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177 } |
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178 return methods2; |
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179 } |
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180 |
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181 Method translate(Method method, ConstantPool constant_pool, Map<Object,Object> translations) { |
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182 Method method2 = (Method) translations.get(method); |
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183 if (method2 == null) { |
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184 Attributes attributes2 = translateAttributes(method.attributes, constant_pool, |
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185 translations); |
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186 |
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187 if (attributes2 == method.attributes) |
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188 method2 = method; |
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189 else |
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190 method2 = new Method( |
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191 method.access_flags, |
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192 method.name_index, |
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193 method.descriptor, |
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194 attributes2); |
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195 translations.put(method, method2); |
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196 } |
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197 return method2; |
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198 } |
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199 |
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200 Attributes translateAttributes(Attributes attributes, |
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201 ConstantPool constant_pool, Map<Object,Object> translations) { |
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202 Attributes attributes2 = (Attributes) translations.get(attributes); |
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203 if (attributes2 == null) { |
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204 Attribute[] attrArray2 = new Attribute[attributes.size()]; |
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205 ConstantPool constant_pool2 = translate(constant_pool, translations); |
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206 boolean attrsEqual = true; |
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207 for (int i = 0; i < attributes.size(); i++) { |
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208 Attribute attr = attributes.get(i); |
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209 Attribute attr2 = translate(attr, translations); |
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210 if (attr2 != attr) |
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211 attrsEqual = false; |
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212 attrArray2[i] = attr2; |
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213 } |
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214 if ((constant_pool2 == constant_pool) && attrsEqual) |
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215 attributes2 = attributes; |
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216 else |
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217 attributes2 = new Attributes(constant_pool2, attrArray2); |
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218 translations.put(attributes, attributes2); |
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219 } |
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220 return attributes2; |
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221 } |
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222 |
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223 Attribute translate(Attribute attribute, Map<Object,Object> translations) { |
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224 Attribute attribute2 = (Attribute) translations.get(attribute); |
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225 if (attribute2 == null) { |
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226 attribute2 = attribute; // don't support translation within attributes yet |
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227 // (what about Code attribute) |
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228 translations.put(attribute, attribute2); |
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229 } |
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230 return attribute2; |
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231 } |
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232 |
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233 private static <T> boolean equal(T[] a1, T[] a2) { |
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234 if (a1 == null || a2 == null) |
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235 return (a1 == a2); |
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236 if (a1.length != a2.length) |
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237 return false; |
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238 for (int i = 0; i < a1.length; i++) { |
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239 if (a1[i] != a2[i]) |
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240 return false; |
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241 } |
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242 return true; |
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243 } |
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244 |
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245 public CPInfo visitClass(CONSTANT_Class_info info, Map<Object, Object> translations) { |
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246 CONSTANT_Class_info info2 = (CONSTANT_Class_info) translations.get(info); |
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247 if (info2 == null) { |
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248 ConstantPool cp2 = translate(info.cp, translations); |
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249 if (cp2 == info.cp) |
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250 info2 = info; |
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251 else |
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252 info2 = new CONSTANT_Class_info(cp2, info.name_index); |
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253 translations.put(info, info2); |
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254 } |
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255 return info; |
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256 } |
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257 |
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258 public CPInfo visitDouble(CONSTANT_Double_info info, Map<Object, Object> translations) { |
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259 CONSTANT_Double_info info2 = (CONSTANT_Double_info) translations.get(info); |
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260 if (info2 == null) { |
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261 info2 = info; |
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262 translations.put(info, info2); |
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263 } |
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264 return info; |
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265 } |
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266 |
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267 public CPInfo visitFieldref(CONSTANT_Fieldref_info info, Map<Object, Object> translations) { |
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268 CONSTANT_Fieldref_info info2 = (CONSTANT_Fieldref_info) translations.get(info); |
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269 if (info2 == null) { |
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270 ConstantPool cp2 = translate(info.cp, translations); |
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271 if (cp2 == info.cp) |
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272 info2 = info; |
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273 else |
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274 info2 = new CONSTANT_Fieldref_info(cp2, info.class_index, info.name_and_type_index); |
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275 translations.put(info, info2); |
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276 } |
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277 return info; |
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278 } |
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279 |
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280 public CPInfo visitFloat(CONSTANT_Float_info info, Map<Object, Object> translations) { |
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281 CONSTANT_Float_info info2 = (CONSTANT_Float_info) translations.get(info); |
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282 if (info2 == null) { |
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283 info2 = info; |
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284 translations.put(info, info2); |
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285 } |
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286 return info; |
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287 } |
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288 |
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289 public CPInfo visitInteger(CONSTANT_Integer_info info, Map<Object, Object> translations) { |
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290 CONSTANT_Integer_info info2 = (CONSTANT_Integer_info) translations.get(info); |
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291 if (info2 == null) { |
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292 info2 = info; |
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293 translations.put(info, info2); |
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294 } |
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295 return info; |
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296 } |
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297 |
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298 public CPInfo visitInterfaceMethodref(CONSTANT_InterfaceMethodref_info info, Map<Object, Object> translations) { |
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299 CONSTANT_InterfaceMethodref_info info2 = (CONSTANT_InterfaceMethodref_info) translations.get(info); |
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300 if (info2 == null) { |
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301 ConstantPool cp2 = translate(info.cp, translations); |
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302 if (cp2 == info.cp) |
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303 info2 = info; |
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304 else |
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305 info2 = new CONSTANT_InterfaceMethodref_info(cp2, info.class_index, info.name_and_type_index); |
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306 translations.put(info, info2); |
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307 } |
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308 return info; |
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309 } |
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310 |
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311 public CPInfo visitInvokeDynamic(CONSTANT_InvokeDynamic_info info, Map<Object, Object> translations) { |
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312 CONSTANT_InvokeDynamic_info info2 = (CONSTANT_InvokeDynamic_info) translations.get(info); |
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313 if (info2 == null) { |
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314 ConstantPool cp2 = translate(info.cp, translations); |
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315 if (cp2 == info.cp) { |
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316 info2 = info; |
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317 } else { |
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318 info2 = new CONSTANT_InvokeDynamic_info(cp2, info.bootstrap_method_attr_index, info.name_and_type_index); |
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319 } |
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320 translations.put(info, info2); |
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321 } |
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322 return info; |
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323 } |
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324 |
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325 public CPInfo visitLong(CONSTANT_Long_info info, Map<Object, Object> translations) { |
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326 CONSTANT_Long_info info2 = (CONSTANT_Long_info) translations.get(info); |
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327 if (info2 == null) { |
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328 info2 = info; |
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329 translations.put(info, info2); |
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330 } |
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331 return info; |
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332 } |
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333 |
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334 public CPInfo visitNameAndType(CONSTANT_NameAndType_info info, Map<Object, Object> translations) { |
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335 CONSTANT_NameAndType_info info2 = (CONSTANT_NameAndType_info) translations.get(info); |
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336 if (info2 == null) { |
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337 ConstantPool cp2 = translate(info.cp, translations); |
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338 if (cp2 == info.cp) |
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339 info2 = info; |
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340 else |
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341 info2 = new CONSTANT_NameAndType_info(cp2, info.name_index, info.type_index); |
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342 translations.put(info, info2); |
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343 } |
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344 return info; |
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345 } |
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346 |
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347 public CPInfo visitMethodref(CONSTANT_Methodref_info info, Map<Object, Object> translations) { |
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348 CONSTANT_Methodref_info info2 = (CONSTANT_Methodref_info) translations.get(info); |
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349 if (info2 == null) { |
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350 ConstantPool cp2 = translate(info.cp, translations); |
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351 if (cp2 == info.cp) |
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352 info2 = info; |
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353 else |
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354 info2 = new CONSTANT_Methodref_info(cp2, info.class_index, info.name_and_type_index); |
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355 translations.put(info, info2); |
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356 } |
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357 return info; |
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358 } |
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359 |
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360 public CPInfo visitMethodHandle(CONSTANT_MethodHandle_info info, Map<Object, Object> translations) { |
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361 CONSTANT_MethodHandle_info info2 = (CONSTANT_MethodHandle_info) translations.get(info); |
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362 if (info2 == null) { |
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363 ConstantPool cp2 = translate(info.cp, translations); |
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364 if (cp2 == info.cp) { |
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365 info2 = info; |
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366 } else { |
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367 info2 = new CONSTANT_MethodHandle_info(cp2, info.reference_kind, info.reference_index); |
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368 } |
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369 translations.put(info, info2); |
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370 } |
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371 return info; |
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372 } |
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373 |
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374 public CPInfo visitMethodType(CONSTANT_MethodType_info info, Map<Object, Object> translations) { |
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375 CONSTANT_MethodType_info info2 = (CONSTANT_MethodType_info) translations.get(info); |
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376 if (info2 == null) { |
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377 ConstantPool cp2 = translate(info.cp, translations); |
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378 if (cp2 == info.cp) { |
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379 info2 = info; |
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380 } else { |
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381 info2 = new CONSTANT_MethodType_info(cp2, info.descriptor_index); |
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382 } |
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383 translations.put(info, info2); |
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384 } |
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385 return info; |
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386 } |
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387 |
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388 public CPInfo visitString(CONSTANT_String_info info, Map<Object, Object> translations) { |
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389 CONSTANT_String_info info2 = (CONSTANT_String_info) translations.get(info); |
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390 if (info2 == null) { |
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391 ConstantPool cp2 = translate(info.cp, translations); |
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392 if (cp2 == info.cp) |
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393 info2 = info; |
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394 else |
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395 info2 = new CONSTANT_String_info(cp2, info.string_index); |
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396 translations.put(info, info2); |
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397 } |
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398 return info; |
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399 } |
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400 |
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401 public CPInfo visitUtf8(CONSTANT_Utf8_info info, Map<Object, Object> translations) { |
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402 CONSTANT_Utf8_info info2 = (CONSTANT_Utf8_info) translations.get(info); |
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403 if (info2 == null) { |
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404 info2 = info; |
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405 translations.put(info, info2); |
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406 } |
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407 return info; |
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408 } |
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409 |
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410 } |
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