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1 /* |
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2 * Copyright (c) 2009, 2019, 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. |
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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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
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22 * |
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23 */ |
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24 |
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25 package shared; |
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26 |
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27 import jdk.internal.org.objectweb.asm.ClassWriter; |
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28 import static jdk.internal.org.objectweb.asm.ClassWriter.COMPUTE_FRAMES; |
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29 import static jdk.internal.org.objectweb.asm.ClassWriter.COMPUTE_MAXS; |
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30 import jdk.internal.org.objectweb.asm.MethodVisitor; |
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31 import static jdk.internal.org.objectweb.asm.Opcodes.*; |
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32 import static shared.AccessCheck.*; |
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33 |
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34 public class GenericClassGenerator<T extends GenericClassGenerator> { |
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35 private static final String targetMethodName = Utils.TARGET_METHOD_NAME; |
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36 |
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37 private int flags = 0; |
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38 private ClassWriter writer; |
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39 private String fullClassName = null; |
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40 private String parentClassName = null; |
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41 |
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42 /*******************************************************************/ |
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43 public GenericClassGenerator(String fullClassName) { |
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44 this(fullClassName, "java/lang/Object"); |
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45 } |
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46 |
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47 /*******************************************************************/ |
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48 public GenericClassGenerator(String fullClassName, String parentClassName ) { |
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49 this(fullClassName, parentClassName, ACC_PUBLIC); |
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50 } |
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51 |
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52 /*******************************************************************/ |
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53 public GenericClassGenerator(String fullClassName, String parentClassName, int flags) { |
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54 this(fullClassName, parentClassName, flags, new String[0]); |
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55 } |
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56 |
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57 /*******************************************************************/ |
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58 public GenericClassGenerator(String fullClassName, String parentClassName, int flags, String[] implementedInterfaces) { |
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59 writer = new ClassWriter(COMPUTE_FRAMES | COMPUTE_MAXS); |
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60 |
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61 this.fullClassName = fullClassName; |
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62 this.flags = flags; |
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63 |
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64 // Construct simple class |
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65 if (parentClassName != null) { |
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66 this.parentClassName = getInternalName(parentClassName); |
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67 } else { |
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68 this.parentClassName = "java/lang/Object"; |
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69 } |
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70 |
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71 String parent = this.parentClassName; |
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72 String name = getInternalName(fullClassName); |
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73 |
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74 if (Utils.isACC_SUPER) { |
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75 flags = flags | ACC_SUPER; |
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76 } |
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77 |
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78 writer.visit(Utils.version, flags, name, null, parent, implementedInterfaces); |
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79 |
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80 // Add constructor |
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81 if ( !isInterface(flags) ) { |
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82 MethodVisitor m = |
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83 writer.visitMethod( |
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84 ACC_PUBLIC |
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85 , "<init>" |
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86 , "()V" |
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87 , null |
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88 , null |
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89 ); |
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90 |
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91 m.visitCode(); |
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92 m.visitVarInsn(ALOAD, 0); |
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93 m.visitMethodInsn( |
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94 INVOKESPECIAL |
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95 , getInternalName(parent) |
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96 , "<init>" |
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97 , "()V" |
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98 ); |
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99 m.visitInsn(RETURN); |
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100 m.visitEnd(); |
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101 m.visitMaxs(0,0); |
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102 } |
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103 } |
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104 |
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105 /*******************************************************************/ |
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106 protected static String getInternalName(String fullClassName) { |
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107 return fullClassName.replaceAll("\\.", "/"); |
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108 } |
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109 |
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110 /*******************************************************************/ |
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111 public T addTargetConstructor(AccessType access) { |
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112 // AccessType.UNDEF means that the target method isn't defined, so do nothing |
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113 if (access == AccessType.UNDEF || isInterface(flags) ) { |
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114 return (T)this; |
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115 } |
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116 |
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117 // Add target constructor |
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118 int methodAccessType = access.value(); |
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119 |
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120 MethodVisitor m = |
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121 writer.visitMethod( |
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122 methodAccessType |
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123 , "<init>" |
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124 , "(I)V" |
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125 , null |
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126 , null |
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127 ); |
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128 |
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129 // Add a call to parent constructor |
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130 m.visitCode(); |
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131 m.visitVarInsn(ALOAD, 0); |
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132 m.visitMethodInsn( |
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133 INVOKESPECIAL |
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134 , getInternalName(parentClassName) |
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135 , "<init>" |
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136 , "()V" |
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137 ); |
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138 |
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139 // Add result reporting |
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140 String shortName = fullClassName.substring(fullClassName.lastIndexOf('.') + 1); |
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141 m.visitLdcInsn(shortName+".<init>"); |
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142 m.visitFieldInsn( |
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143 PUTSTATIC |
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144 , "Result" |
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145 , "value" |
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146 , "Ljava/lang/String;" |
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147 ); |
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148 |
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149 m.visitInsn(RETURN); |
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150 m.visitEnd(); |
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151 m.visitMaxs(0,0); |
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152 |
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153 return (T)this; |
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154 |
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155 } |
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156 |
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157 /*******************************************************************/ |
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158 public T addTargetMethod(AccessType access) { |
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159 return addTargetMethod(access, 0); |
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160 } |
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161 |
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162 /*******************************************************************/ |
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163 public T addTargetMethod(AccessType access, int additionalFlags) { |
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164 // AccessType.UNDEF means that the target method isn't defined, so do nothing |
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165 if (access == AccessType.UNDEF) { |
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166 return (T)this; |
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167 } |
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168 |
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169 // Add target method |
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170 int methodAccessType = access.value(); |
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171 if ( isInterface(flags) || isAbstract(flags) ) { |
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172 methodAccessType |= ACC_ABSTRACT; |
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173 } |
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174 |
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175 // Skip method declaration for abstract private case, which doesn't pass |
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176 // classfile verification stage |
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177 if ( isPrivate(methodAccessType) && isAbstract(methodAccessType) ) { |
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178 return (T)this; |
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179 } |
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180 |
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181 MethodVisitor m = |
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182 writer.visitMethod( |
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183 methodAccessType | additionalFlags |
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184 , targetMethodName |
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185 , "()Ljava/lang/String;" |
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186 , null |
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187 , null |
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188 ); |
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189 |
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190 // Don't generate body if the method is abstract |
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191 if ( (methodAccessType & ACC_ABSTRACT) == 0 ) { |
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192 String shortName = fullClassName.substring(fullClassName.lastIndexOf('.') + 1); |
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193 |
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194 // Simply returns info about itself |
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195 m.visitCode(); |
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196 m.visitLdcInsn(shortName+"."+targetMethodName); |
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197 m.visitInsn(ARETURN); |
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198 m.visitEnd(); |
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199 m.visitMaxs(0,0); |
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200 } |
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201 |
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202 return (T)this; |
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203 } |
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204 |
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205 /*******************************************************************/ |
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206 public T addField(int access, String name, String type) { |
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207 writer.visitField( |
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208 access |
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209 , name |
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210 , getInternalName(type) |
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211 , null |
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212 , null |
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213 ) |
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214 .visitEnd(); |
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215 |
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216 return (T)this; |
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217 } |
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218 |
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219 /*******************************************************************/ |
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220 // Add target method call site into current class |
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221 public T addCaller(String targetClass, int callType) { |
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222 MethodVisitor m = writer.visitMethod( |
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223 ACC_PUBLIC | ACC_STATIC |
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224 , "call" |
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225 , String.format( "(L%s;)Ljava/lang/String;" , getInternalName(targetClass)) |
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226 , null |
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227 , null |
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228 ); |
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229 |
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230 m.visitCode(); |
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231 m.visitVarInsn(ALOAD, 0); |
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232 m.visitMethodInsn( |
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233 callType |
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234 , getInternalName(targetClass) |
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235 , targetMethodName |
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236 , "()Ljava/lang/String;" |
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237 ); |
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238 m.visitInsn(ARETURN); |
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239 m.visitEnd(); |
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240 m.visitMaxs(0,0); |
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241 |
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242 return (T)this; |
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243 } |
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244 |
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245 /*******************************************************************/ |
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246 public byte[] getClassFile() { |
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247 writer.visitEnd(); |
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248 return writer.toByteArray(); |
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249 } |
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250 |
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251 /*******************************************************************/ |
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252 public String getFullClassName() { |
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253 return fullClassName; |
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254 } |
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255 } |