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annotate graal/Runtime/src/com/sun/hotspot/c1x/InvocationSocket.java @ 2297:099e697d8934

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Renaming c1x4hotspotsrc => graal and HotSpotVM => Runtime
author Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
date Fri, 22 Apr 2011 15:08:53 +0200
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1 /*
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2 * Copyright (c) 2010 Sun Microsystems, Inc. All rights reserved.
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3 *
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4 * Sun Microsystems, Inc. has intellectual property rights relating to technology embodied in the product
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5 * that is described in this document. In particular, and without limitation, these intellectual property
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6 * rights may include one or more of the U.S. patents listed at http://www.sun.com/patents and one or
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7 * more additional patents or pending patent applications in the U.S. and in other countries.
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8 *
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9 * U.S. Government Rights - Commercial software. Government users are subject to the Sun
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10 * Microsystems, Inc. standard license agreement and applicable provisions of the FAR and its
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11 * supplements.
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12 *
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13 * Use is subject to license terms. Sun, Sun Microsystems, the Sun logo, Java and Solaris are trademarks or
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14 * registered trademarks of Sun Microsystems, Inc. in the U.S. and other countries. All SPARC trademarks
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15 * are used under license and are trademarks or registered trademarks of SPARC International, Inc. in the
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16 * U.S. and other countries.
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17 *
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18 * UNIX is a registered trademark in the U.S. and other countries, exclusively licensed through X/Open
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19 * Company, Ltd.
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20 */
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21 package com.sun.hotspot.c1x;
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22
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23 import java.io.*;
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24 import java.lang.reflect.*;
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25 import java.util.*;
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26
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27 import com.sun.hotspot.c1x.logging.*;
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28
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29 /**
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30 * A collection of java.lang.reflect proxies that communicate over a socket connection.
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31 *
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32 * Calling a method sends the method name and the parameters through the socket. Afterwards this class waits for a
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33 * result. While waiting for a result three types of objects can arrive through the socket: a method invocation, a
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34 * method result or an exception. Method invocation can thus be recursive.
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35 *
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36 * @author Lukas Stadler
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37 */
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38 public class InvocationSocket {
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39
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40 private static final boolean DEBUG = false;
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41 private static final boolean COUNT_CALLS = false;
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42
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43 private static final HashSet<String> cachedMethodNames = new HashSet<String>();
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44 private static final HashSet<String> forbiddenMethodNames = new HashSet<String>();
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45
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46 static {
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47 cachedMethodNames.add("name");
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48 cachedMethodNames.add("kind");
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49 cachedMethodNames.add("isResolved");
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50 cachedMethodNames.add("getVMEntries");
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51 cachedMethodNames.add("exactType");
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52 cachedMethodNames.add("isInitialized");
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53 forbiddenMethodNames.add("javaClass");
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54 }
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55
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56 private final ObjectOutputStream output;
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57 private final ObjectInputStream input;
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58
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59 private final Map<String, Integer> counts = new HashMap<String, Integer>();
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60
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61 public InvocationSocket(ObjectOutputStream output, ObjectInputStream input) {
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62 this.output = output;
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63 this.input = input;
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64
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65 if (COUNT_CALLS) {
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66 Runtime.getRuntime().addShutdownHook(new Thread() {
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67 @Override
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68 public void run() {
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69 SortedMap<Integer, String> sorted = new TreeMap<Integer, String>();
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70 for (Map.Entry<String, Integer> entry : counts.entrySet()) {
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71 sorted.put(entry.getValue(), entry.getKey());
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72 }
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73 for (Map.Entry<Integer, String> entry : sorted.entrySet()) {
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74 System.out.println(entry.getKey() + ": " + entry.getValue());
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75 }
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76 }
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77 });
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78 }
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79 }
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80
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81 /**
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82 * Represents one invocation of a method that is transferred via the socket connection.
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83 *
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84 * @author Lukas Stadler
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85 */
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86 private static class Invocation implements Serializable {
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87
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88 public Object receiver;
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89 public String methodName;
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90 public Object[] args;
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91
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92 public Invocation(Object receiver, String methodName, Object[] args) {
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93 this.receiver = receiver;
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94 this.methodName = methodName;
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95 this.args = args;
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96 }
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97 }
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98
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99 /**
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100 * Represents the result of an invocation that is transferred via the socket connection.
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101 *
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102 * @author Lukas Stadler
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103 */
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104 private static class Result implements Serializable {
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105
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106 public Object result;
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107
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108 public Result(Object result) {
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109 this.result = result;
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110 }
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111 }
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112
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113 private void incCount(String name, Object[] args) {
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114 if (COUNT_CALLS) {
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115 name = name + (args == null ? 0 : args.length);
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116 if (counts.get(name) != null) {
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117 counts.put(name, counts.get(name) + 1);
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118 } else {
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119 counts.put(name, 1);
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120 }
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121 }
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122 }
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123
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124 /**
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125 * Each instance of this class handles remote invocations for one instance of a Remote class. It will forward all
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126 * interface methods to the other end of the socket and cache the results of calls to certain methods.
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127 *
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128 * @author Lukas Stadler
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129 */
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130 public class Handler implements InvocationHandler {
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131
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132 private final Object receiver;
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133 private final HashMap<String, Object> cache = new HashMap<String, Object>();
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134
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135 public Handler(Object receiver) {
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136 this.receiver = receiver;
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137 }
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138
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139 @Override
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140 public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
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141 // only interface methods can be transferred, java.lang.Object methods
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142 if (method.getDeclaringClass() == Object.class) {
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143 return method.invoke(receiver, args);
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144 }
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145 String methodName = method.getName();
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146 // check if the result of this zero-arg method was cached
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147 if (args == null || args.length == 0) {
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148 if (cache.containsKey(methodName)) {
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149 return cache.get(methodName);
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150 }
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151 }
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152 if (forbiddenMethodNames.contains(methodName)) {
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153 throw new IllegalAccessException(methodName + " not allowed");
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154 }
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155 Object result = null;
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156 try {
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157 if (DEBUG) {
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158 Logger.startScope("invoking remote " + methodName);
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159 }
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160 incCount(methodName, args);
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161
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162 output.writeObject(new Invocation(receiver, methodName, args));
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163 output.flush();
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164 result = waitForResult(false);
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165
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166 // result caching for selected methods
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167 if ((args == null || args.length == 0) && cachedMethodNames.contains(methodName)) {
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168 cache.put(methodName, result);
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169 }
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170 return result;
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171 } catch (Throwable t) {
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172 t.printStackTrace();
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173 throw t;
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174 } finally {
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175 if (DEBUG) {
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176 Logger.endScope(" = " + result);
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177 }
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178 }
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179 }
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180 }
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181
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182 /**
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183 * Waits for the result of a remote method invocation. Invocations that should be executed in this VM might arrive
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184 * while waiting for the result, and these invocations will be executed before again waiting fort he result.
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185 */
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186 public Object waitForResult(boolean eofExpected) throws IOException, ClassNotFoundException {
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187 while (true) {
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188 Object in;
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189 try {
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190 in = input.readObject();
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191 } catch(EOFException e) {
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192 if (eofExpected) {
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193 return null;
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194 }
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195 throw e;
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196 }
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197 if (in instanceof Result) {
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198 return ((Result) in).result;
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199 } else if (in instanceof RuntimeException) {
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200 throw (RuntimeException) in;
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201 } else if (in instanceof Throwable) {
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202 throw new RuntimeException((Throwable) in);
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203 }
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204
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205 Invocation invoke = (Invocation) in;
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206 Method method = null;
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207 for (Class<?> clazz = invoke.receiver.getClass(); clazz != null; clazz = clazz.getSuperclass()) {
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208 for (Method m : clazz.getDeclaredMethods()) {
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209 if (invoke.methodName.equals(m.getName())) {
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210 method = m;
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211 break;
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212 }
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213 }
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214 }
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215 if (method == null) {
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216 Exception e = new UnsupportedOperationException("unknown method " + invoke.methodName);
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217 e.printStackTrace();
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218 output.writeObject(e);
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219 output.flush();
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220 } else {
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221 Object result = null;
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diff changeset
222 try {
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223 if (invoke.args == null) {
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224 if (DEBUG) {
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225 Logger.startScope("invoking local " + invoke.methodName);
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226 }
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227 result = method.invoke(invoke.receiver);
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228 } else {
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229 if (Logger.ENABLED && DEBUG) {
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230 StringBuilder str = new StringBuilder();
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231 str.append("invoking local " + invoke.methodName + "(");
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diff changeset
232 for (int i = 0; i < invoke.args.length; i++) {
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233 str.append(i == 0 ? "" : ", ");
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234 str.append(Logger.pretty(invoke.args[i]));
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235 }
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236 str.append(")");
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diff changeset
237 Logger.startScope(str.toString());
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238 }
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239 result = method.invoke(invoke.receiver, invoke.args);
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240 }
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241 result = new Result(result);
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242 } catch (IllegalArgumentException e) {
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243 System.out.println("error while invoking " + invoke.methodName);
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244 e.getCause().printStackTrace();
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245 result = e.getCause();
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diff changeset
246 } catch (InvocationTargetException e) {
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diff changeset
247 System.out.println("error while invoking " + invoke.methodName);
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248 e.getCause().printStackTrace();
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249 result = e.getCause();
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250 } catch (IllegalAccessException e) {
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251 System.out.println("error while invoking " + invoke.methodName);
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252 e.getCause().printStackTrace();
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253 result = e.getCause();
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254 } finally {
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255 if (DEBUG) {
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256 if (result instanceof Result) {
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257 Logger.endScope(" = " + ((Result)result).result);
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258 } else {
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259 Logger.endScope(" = " + result);
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260 }
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261 }
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262 }
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263 output.writeObject(result);
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264 output.flush();
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265 }
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266 }
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267 }
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268
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269 /**
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270 * Sends a result without invoking a method, used by CompilationServer startup code.
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271 */
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272 public void sendResult(Object obj) throws IOException {
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273 output.writeObject(new Result(obj));
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274 output.flush();
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275 }
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276 }