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annotate test/runtime/6925573/SortMethodsTest.java @ 1498:77261afdc5f2

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6935118: UseCompressedOops modification in methodOopDesc::sort_methods() causes JCK timeout Summary: Add comparison functions for compressed oops to use bubblesort. Reviewed-by: never, coleenp Contributed-by: volker.simonis@gmail.com
author coleenp
date Tue, 04 May 2010 15:12:08 -0400
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children c18cbe5936b8
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1498
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1 /*
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2 * Copyright 2008-2010 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 import java.io.ByteArrayOutputStream;
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26 import java.io.IOException;
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27 import java.io.OutputStream;
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28 import java.io.PrintWriter;
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29 import java.io.StringWriter;
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30
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31 import java.lang.reflect.Method;
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32 import java.net.URI;
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33 import java.util.Arrays;
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34 import java.util.Vector;
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35
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36 import javax.tools.Diagnostic;
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37 import javax.tools.DiagnosticCollector;
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38 import javax.tools.FileObject;
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39 import javax.tools.ForwardingJavaFileManager;
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40 import javax.tools.JavaCompiler;
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41 import javax.tools.JavaCompiler.CompilationTask;
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42 import javax.tools.JavaFileManager;
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43 import javax.tools.JavaFileObject;
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44 import javax.tools.JavaFileObject.Kind;
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45 import javax.tools.SimpleJavaFileObject;
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46 import javax.tools.StandardJavaFileManager;
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47 import javax.tools.ToolProvider;
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48
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49 /*
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50 * @test SortMethodsTest
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51 * @bug 6925573
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52 * @summary verify that class loading does not need quadratic time with regard to the number of class
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53 methods.
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54 * @run main SortMethodsTest
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55 * @author volker.simonis@gmail.com
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56 */
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57
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58 public class SortMethodsTest {
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59
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60 static String createClass(String name, int nrOfMethods) {
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61 StringWriter sw = new StringWriter();
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62 PrintWriter pw = new PrintWriter(sw);
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63 pw.println("public class " + name + "{");
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64 for (int i = 0; i < nrOfMethods; i++) {
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65 pw.println(" public void m" + i + "() {}");
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66 }
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67 pw.println(" public static String sayHello() {");
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68 pw.println(" return \"Hello from class \" + " + name +
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69 ".class.getName() + \" with \" + " + name +
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70 ".class.getDeclaredMethods().length + \" methods\";");
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71 pw.println(" }");
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72 pw.println("}");
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73 pw.close();
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74 return sw.toString();
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75 }
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76
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77 public static void main(String args[]) {
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78
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79 JavaCompiler comp = ToolProvider.getSystemJavaCompiler();
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80 DiagnosticCollector<JavaFileObject> diags = new DiagnosticCollector<JavaFileObject>();
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81 final String cName = new String("ManyMethodsClass");
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82 Vector<Long> results = new Vector<Long>();
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83
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84 for (int i = 6; i < 600000; i*=10) {
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85 String klass = createClass(cName, i);
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86 JavaMemoryFileObject file = new JavaMemoryFileObject(cName, klass);
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87 MemoryFileManager mfm = new MemoryFileManager(comp.getStandardFileManager(diags, null, null), file);
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88 CompilationTask task = comp.getTask(null, mfm, diags, null, null, Arrays.asList(file));
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89
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90 if (task.call()) {
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91 try {
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92 MemoryClassLoader mcl = new MemoryClassLoader(file);
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93 long start = System.nanoTime();
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94 Class<? extends Object> c = Class.forName(cName, true, mcl);
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95 long end = System.nanoTime();
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96 results.add(end - start);
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97 Method m = c.getDeclaredMethod("sayHello", new Class[0]);
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98 String ret = (String)m.invoke(null, new Object[0]);
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99 System.out.println(ret + " (loaded and resloved in " + (end - start) + "ns)");
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100 } catch (Exception e) {
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101 System.err.println(e);
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102 }
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103 }
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104 else {
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105 System.out.println(klass);
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106 System.out.println();
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107 for (Diagnostic diag : diags.getDiagnostics()) {
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108 System.out.println(diag.getCode() + "\n" + diag.getKind() + "\n" + diag.getPosition());
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109 System.out.println(diag.getSource() + "\n" + diag.getMessage(null));
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110 }
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111 }
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112 }
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113
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114 long lastRatio = 0;
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115 for (int i = 2; i < results.size(); i++) {
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116 long normalized1 = Math.max(results.get(i-1) - results.get(0), 1);
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117 long normalized2 = Math.max(results.get(i) - results.get(0), 1);
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118 long ratio = normalized2/normalized1;
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119 lastRatio = ratio;
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120 System.out.println("10 x more methods requires " + ratio + " x more time");
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121 }
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122 // The following is just vague estimation but seems to work on current x86_64 and sparcv9 machines
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123 if (lastRatio > 80) {
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124 throw new RuntimeException("ATTENTION: it seems that class loading needs quadratic time with regard to the number of class methods!!!");
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125 }
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126 }
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127 }
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128
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129 class JavaMemoryFileObject extends SimpleJavaFileObject {
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130
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131 private final String code;
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132 private ByteArrayOutputStream byteCode;
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133
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134 JavaMemoryFileObject(String name, String code) {
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135 super(URI.create("string:///" + name.replace('.','/') + Kind.SOURCE.extension), Kind.SOURCE);
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136 this.code = code;
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137 }
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138
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139 @Override
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140 public CharSequence getCharContent(boolean ignoreEncodingErrors) {
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141 return code;
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142 }
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143
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144 @Override
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145 public OutputStream openOutputStream() {
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146 byteCode = new ByteArrayOutputStream();
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147 return byteCode;
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148 }
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149
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150 byte[] getByteCode() {
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151 return byteCode.toByteArray();
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152 }
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153 }
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154
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155 class MemoryClassLoader extends ClassLoader {
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156
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157 private final JavaMemoryFileObject jfo;
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158
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159 public MemoryClassLoader(JavaMemoryFileObject jfo) {
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160 this.jfo = jfo;
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161 }
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162
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163 public Class findClass(String name) {
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164 byte[] b = jfo.getByteCode();
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165 return defineClass(name, b, 0, b.length);
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166 }
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167 }
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168
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169 class MemoryFileManager extends ForwardingJavaFileManager<JavaFileManager> {
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170
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171 private final JavaFileObject jfo;
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172
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173 public MemoryFileManager(StandardJavaFileManager jfm, JavaFileObject jfo) {
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174 super(jfm);
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175 this.jfo = jfo;
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176 }
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177
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178 @Override
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179 public FileObject getFileForInput(Location location, String packageName,
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180 String relativeName) throws IOException {
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181 return jfo;
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182 }
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183
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184 @Override
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185 public JavaFileObject getJavaFileForOutput(Location location, String qualifiedName,
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186 Kind kind, FileObject outputFile) throws IOException {
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187 return jfo;
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188 }
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189
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190 }