Mercurial > hg > Members > kono > jpf-core
annotate src/main/gov/nasa/jpf/vm/NativePeer.java @ 34:49be04cc6389 default tip java9-try
cyclic dependency ...
author | Shinji KONO <kono@ie.u-ryukyu.ac.jp> |
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date | Tue, 19 Dec 2017 11:21:23 +0900 |
parents | 3517702bd768 |
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rev | line source |
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1 /* |
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2 * Copyright (C) 2014, United States Government, as represented by the |
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3 * Administrator of the National Aeronautics and Space Administration. |
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4 * All rights reserved. |
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5 * |
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6 * The Java Pathfinder core (jpf-core) platform is licensed under the |
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7 * Apache License, Version 2.0 (the "License"); you may not use this file except |
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8 * in compliance with the License. You may obtain a copy of the License at |
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9 * |
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10 * http://www.apache.org/licenses/LICENSE-2.0. |
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11 * |
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12 * Unless required by applicable law or agreed to in writing, software |
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13 * distributed under the License is distributed on an "AS IS" BASIS, |
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14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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15 * See the License for the specific language governing permissions and |
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16 * limitations under the License. |
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17 */ |
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18 package gov.nasa.jpf.vm; |
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19 |
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20 import gov.nasa.jpf.Config; |
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21 import gov.nasa.jpf.JPF; |
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22 import gov.nasa.jpf.JPFException; |
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23 import gov.nasa.jpf.annotation.MJI; |
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24 import gov.nasa.jpf.util.JPFLogger; |
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25 |
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26 import java.lang.reflect.Constructor; |
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27 import java.lang.reflect.InvocationTargetException; |
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28 import java.lang.reflect.Method; |
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29 import java.lang.reflect.Modifier; |
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30 import java.util.HashMap; |
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31 import java.util.Map; |
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32 import java.util.logging.Level; |
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33 |
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34 |
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35 /** |
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36 * native peer classes are part of MJI and contain the code that is |
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37 * executed by the host VM (i.e. outside the state-tracked JPF VM). Each |
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38 * class executed by JPF that has native mehods must have a native peer class |
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39 * (which is looked up and associated at class loadtime) |
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40 */ |
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41 public class NativePeer implements Cloneable { |
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42 |
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43 static final String MODEL_PACKAGE = "<model>"; |
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44 static final String DEFAULT_PACKAGE = "<default>"; |
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45 |
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46 static JPFLogger logger = JPF.getLogger("class"); |
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47 |
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48 static ClassLoader loader; |
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49 static HashMap<ClassInfo, NativePeer> peers; |
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50 static Config config; |
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51 static boolean noOrphanMethods; |
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52 |
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53 static String[] peerPackages; |
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54 |
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55 ClassInfo ci; |
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56 Class<?> peerClass; |
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57 HashMap<String, Method> methods; |
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58 |
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59 |
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60 public static boolean init (Config conf) { |
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61 loader = conf.getClassLoader(); |
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62 peers = new HashMap<ClassInfo, NativePeer>(); |
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63 |
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64 peerPackages = getPeerPackages(conf); |
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65 |
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66 config = conf; |
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67 noOrphanMethods = conf.getBoolean("vm.no_orphan_methods", false); |
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68 |
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69 return true; |
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70 } |
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71 |
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72 static String[] getPeerPackages (Config conf) { |
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73 String[] defPeerPackages = { MODEL_PACKAGE, "gov.nasa.jpf.vm", DEFAULT_PACKAGE }; |
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74 String[] packages = conf.getStringArray("peer_packages", defPeerPackages); |
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75 |
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76 // internalize |
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77 for (int i=0; i<packages.length; i++) { |
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78 if (packages[i].equals(MODEL_PACKAGE)) { |
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79 packages[i] = MODEL_PACKAGE; |
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80 } else if (packages[i].equals(DEFAULT_PACKAGE)) { |
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81 packages[i] = DEFAULT_PACKAGE; |
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82 } |
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83 } |
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84 |
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85 return packages; |
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86 } |
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87 |
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88 static Class<?> locatePeerCls (String clsName) { |
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89 String cn = "JPF_" + clsName.replace('.', '_'); |
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90 |
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91 for (int i=0; i<peerPackages.length; i++) { |
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92 String pcn; |
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93 String pkg = peerPackages[i]; |
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94 |
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95 if (pkg == MODEL_PACKAGE) { |
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96 int j = clsName.lastIndexOf('.'); |
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97 pcn = clsName.substring(0, j+1) + cn; |
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98 } else if (pkg == DEFAULT_PACKAGE) { |
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99 pcn = cn; |
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100 } else { |
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101 pcn = pkg + '.' + cn; |
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102 } |
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103 |
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104 try { |
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105 Class<?> peerCls = loader.loadClass(pcn); |
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106 |
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107 if ((peerCls.getModifiers() & Modifier.PUBLIC) == 0) { |
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108 logger.warning("non-public peer class: ", pcn); |
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109 continue; // pointless to use this one, it would just create IllegalAccessExceptions |
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110 } |
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111 |
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112 logger.info("loaded peer class: ", pcn); |
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113 |
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114 return peerCls; |
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115 } catch (ClassNotFoundException cnfx) { |
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116 // try next one |
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117 } |
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118 } |
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119 |
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120 return null; // nothing found |
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121 } |
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122 |
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123 /** |
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124 * this becomes the factory method to load either a plain (slow) |
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125 * reflection-based peer (a NativePeer object), or some speed optimized |
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126 * derived class object. |
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127 * Watch out - this gets called before the ClassInfo is fully initialized |
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128 * (we shouldn't rely on more than just its name here) |
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129 */ |
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130 static NativePeer getNativePeer (ClassInfo ci) { |
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131 String clsName = ci.getName(); |
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132 NativePeer peer = peers.get(ci); |
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133 Class<?> peerCls = null; |
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134 |
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135 if (peer == null) { |
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136 peerCls = locatePeerCls(clsName); |
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137 |
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138 if (peerCls != null) { |
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139 initializePeerClass( peerCls); |
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140 |
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141 if (logger.isLoggable(Level.INFO)) { |
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142 logger.info("load peer: ", peerCls.getName()); |
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143 } |
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144 |
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145 peer = getInstance(peerCls, NativePeer.class); |
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146 peer.initialize(peerCls, ci, true); |
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147 |
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148 peers.put(ci, peer); |
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149 } |
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150 } |
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151 |
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152 return peer; |
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153 } |
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154 |
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155 public static <T> T getInstance(Class<?> cls, Class<T> type) throws JPFException { |
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156 Class<?>[] argTypes = Config.CONFIG_ARGTYPES; |
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157 Object[] args = config.CONFIG_ARGS; |
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158 |
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159 return getInstance(cls, type, argTypes, args); |
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160 } |
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161 |
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162 public static <T> T getInstance(Class<?> cls, Class<T> type, Class<?>[] argTypes, |
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163 Object[] args) throws JPFException { |
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164 Object o = null; |
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165 Constructor<?> ctor = null; |
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166 |
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167 if (cls == null) { |
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168 return null; |
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169 } |
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170 |
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171 while (o == null) { |
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172 try { |
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173 ctor = cls.getConstructor(argTypes); |
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174 o = ctor.newInstance(args); |
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175 } catch (NoSuchMethodException nmx) { |
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176 |
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177 if ((argTypes.length > 1) || ((argTypes.length == 1) && (argTypes[0] != Config.class))) { |
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178 // fallback 1: try a single Config param |
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179 argTypes = Config.CONFIG_ARGTYPES; |
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180 args = config.CONFIG_ARGS; |
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181 } else if (argTypes.length > 0) { |
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182 // fallback 2: try the default ctor |
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183 argTypes = Config.NO_ARGTYPES; |
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184 args = Config.NO_ARGS; |
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185 |
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186 } else { |
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187 // Ok, there is no suitable ctor, bail out |
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188 throw new JPFException("no suitable ctor found for the peer class " + cls.getName()); |
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189 } |
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190 } catch (IllegalAccessException iacc) { |
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191 throw new JPFException("ctor not accessible: " |
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192 + config.getMethodSignature(ctor)); |
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193 } catch (IllegalArgumentException iarg) { |
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194 throw new JPFException("illegal constructor arguments: " |
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195 + config.getMethodSignature(ctor)); |
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196 } catch (InvocationTargetException ix) { |
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197 Throwable tx = ix.getCause(); |
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198 throw new JPFException("exception " + tx + " occured in " |
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199 + config.getMethodSignature(ctor)); |
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200 } catch (InstantiationException ivt) { |
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201 throw new JPFException("abstract class cannot be instantiated"); |
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202 } catch (ExceptionInInitializerError eie) { |
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203 throw new JPFException("static initialization failed:\n>> " |
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204 + eie.getException(), eie.getException()); |
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205 } |
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206 } |
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207 |
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208 // check type |
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209 if (!cls.isInstance(o)) { |
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210 throw new JPFException("instance not of type: " |
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211 + cls.getName()); |
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212 } |
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213 |
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214 return type.cast(o); // safe according to above |
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215 } |
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216 |
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217 static String getPeerDispatcherClassName (String clsName) { |
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218 return (clsName + '$'); |
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219 } |
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220 |
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221 public Class<?> getPeerClass() { |
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222 return peerClass; |
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223 } |
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224 |
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225 public String getPeerClassName() { |
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226 return peerClass.getName(); |
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227 } |
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228 |
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229 protected void initialize (Class<?> peerClass, ClassInfo ci, boolean cacheMethods) { |
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230 if ((this.ci != null) || (this.peerClass != null)) { |
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231 throw new RuntimeException("cannot re-initialize NativePeer: " + |
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232 peerClass.getName()); |
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233 } |
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234 |
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235 this.ci = ci; |
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236 this.peerClass = peerClass; |
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237 |
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238 loadMethods(cacheMethods); |
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239 } |
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240 |
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241 protected static void initializePeerClass( Class<?> cls) { |
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242 try { |
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243 Method m = cls.getDeclaredMethod("init", Config.class ); |
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244 try { |
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245 m.invoke(null, config); |
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246 } catch (IllegalArgumentException iax){ |
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247 // can't happen - static method |
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248 } catch (IllegalAccessException iacx) { |
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249 throw new RuntimeException("peer initialization method not accessible: " |
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250 + cls.getName()); |
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251 } catch (InvocationTargetException itx){ |
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252 throw new RuntimeException("initialization of peer " + |
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253 cls.getName() + " failed: " + itx.getCause()); |
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254 |
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255 } |
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256 } catch (NoSuchMethodException nsmx){ |
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257 // nothing to do |
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258 } |
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259 } |
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260 |
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261 private static boolean isMJICandidate (Method mth) { |
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262 |
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263 // the native peer should be annotated with @MJI |
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264 if(!mth.isAnnotationPresent(MJI.class)) { |
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265 return false; |
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266 } |
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267 |
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268 // this native peer should be Public |
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269 if(!Modifier.isPublic(mth.getModifiers())) { |
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270 return false; |
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271 } |
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272 |
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273 // native method always have a MJIEnv and int as the first parameters |
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274 Class<?>[] argTypes = mth.getParameterTypes(); |
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275 if ((argTypes.length >= 2) && (argTypes[0] == MJIEnv.class) && (argTypes[1] == int.class) ) { |
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276 return true; |
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277 } else { |
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278 return false; |
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279 } |
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280 } |
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281 |
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282 |
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283 private Method getMethod (MethodInfo mi) { |
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284 return getMethod(null, mi); |
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285 } |
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286 |
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287 private Method getMethod (String prefix, MethodInfo mi) { |
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288 String name = mi.getUniqueName(); |
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289 |
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290 if (prefix != null) { |
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291 name = prefix + name; |
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292 } |
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293 |
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294 return methods.get(name); |
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295 } |
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296 |
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297 /** |
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298 * look at all @MJI annotated methods in the peer and set their |
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299 * corresponding model class MethodInfo attributes |
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300 * <2do> pcm - this is too long, break it down |
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301 */ |
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302 protected void loadMethods (boolean cacheMethods) { |
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303 // since we allow native peer class hierarchies, we have to look at all methods |
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304 //Method[] m = peerClass.getDeclaredMethods(); |
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305 Method[] m = peerClass.getMethods(); |
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306 |
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307 methods = new HashMap<String, Method>(m.length); |
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308 |
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309 Map<String,MethodInfo> methodInfos = ci.getDeclaredMethods(); |
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310 MethodInfo[] mis = null; |
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311 |
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312 for (int i = 0; i < m.length; i++) { |
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313 Method mth = m[i]; |
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314 |
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315 if (isMJICandidate(mth)) { |
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316 // Note that we can't mangle the name automatically, since we loose the |
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317 // object type info (all mapped to int). This has to be handled |
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318 // the same way like with overloaded JNI methods - you have to |
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319 // mangle them manually |
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320 String mn = mth.getName(); |
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321 |
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322 // JNI doesn't allow <clinit> or <init> to be native, but MJI does |
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323 // (you should know what you are doing before you use that, really) |
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324 if (mn.startsWith("$clinit")) { |
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325 mn = "<clinit>"; |
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326 } else if (mn.startsWith("$init")) { |
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327 mn = "<init>" + mn.substring(5); |
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328 } |
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329 |
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330 String mname = Types.getJNIMethodName(mn); |
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331 String sig = Types.getJNISignature(mn); |
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332 |
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333 if (sig != null) { |
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334 mname += sig; |
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335 } |
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336 |
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337 // now try to find a corresponding MethodInfo object and mark it |
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338 // as 'peer-ed' |
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339 // <2do> in case of <clinit>, it wouldn't be strictly required to |
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340 // have a MethodInfo upfront (we could create it). Might be handy |
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341 // for classes where we intercept just a few methods, but need |
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342 // to init before |
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343 MethodInfo mi = methodInfos.get(mname); |
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344 |
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345 if ((mi == null) && (sig == null)) { |
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346 // nothing found, we have to do it the hard way - check if there is |
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347 // a single method with this name (still unsafe, but JNI behavior) |
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348 // Note there's no point in doing that if we do have a signature |
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349 if (mis == null) { // cache it for subsequent lookup |
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350 mis = new MethodInfo[methodInfos.size()]; |
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351 methodInfos.values().toArray(mis); |
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352 } |
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353 |
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354 mi = searchMethod(mname, mis); |
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355 } |
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356 |
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357 if (mi != null) { |
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358 logger.info("load MJI method: ", mname); |
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359 |
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360 NativeMethodInfo miNative = new NativeMethodInfo(mi, mth, this); |
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361 miNative.replace(mi); |
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362 |
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363 } else { |
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364 checkOrphan(mth, mname); |
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365 } |
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366 } |
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367 } |
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368 } |
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369 |
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370 protected void checkOrphan (Method mth, String mname){ |
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371 if (!ignoreOrphan(mth)) { |
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372 // we have an orphan method, i.e. a peer method that does not map into any model method |
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373 // This is usually a signature typo or an out-of-sync peer, but could also be a |
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374 // MJI method in a peer superclass which is bound to a MethodInfo in a model superclass |
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375 |
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376 Class<?> implCls = mth.getDeclaringClass(); |
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377 if (implCls != peerClass) { |
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378 ClassInfo ciSuper = ci.getSuperClass(); |
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379 if (ciSuper != null){ |
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380 MethodInfo mi = ciSuper.getMethod(mname, true); |
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381 if (mi != null){ |
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382 if (mi instanceof NativeMethodInfo){ |
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383 NativeMethodInfo nmi = (NativeMethodInfo)mi; |
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384 if (nmi.getMethod().equals(mth)){ |
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385 return; |
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386 } |
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387 } |
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388 } |
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389 } |
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390 } |
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391 |
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392 String message = "orphan NativePeer method: " + ci.getName() + '.' + mname; |
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393 |
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394 if (noOrphanMethods) { |
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395 throw new JPFException(message); |
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396 } else { |
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397 // issue a warning if we have a NativePeer native method w/o a corresponding |
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398 // method in the model class (this might happen due to compiler optimizations |
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399 // silently skipping empty methods) |
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400 logger.warning(message); |
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401 } |
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402 } |
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403 } |
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404 |
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405 protected boolean ignoreOrphan (Method m){ |
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406 MJI annotation = m.getAnnotation(MJI.class); |
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407 return annotation.noOrphanWarning(); |
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408 } |
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409 |
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410 private MethodInfo searchMethod (String mname, MethodInfo[] methods) { |
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411 int idx = -1; |
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412 |
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413 for (int j = 0; j < methods.length; j++) { |
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414 if (methods[j].getName().equals(mname)) { |
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415 // if this is actually a overloaded method, and the first one |
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416 // isn't the right choice, we would get an IllegalArgumentException, |
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417 // hence we have to go on and make sure it's not overloaded |
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418 |
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419 if (idx == -1) { |
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420 idx = j; |
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421 } else { |
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422 throw new JPFException("overloaded native method without signature: " + ci.getName() + '.' + mname); |
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423 } |
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424 } |
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425 } |
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426 |
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427 if (idx >= 0) { |
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428 return methods[idx]; |
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429 } else { |
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430 return null; |
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431 } |
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432 } |
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433 } |
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434 |