Mercurial > hg > graal-jvmci-8
annotate jvmci/jdk.vm.ci.runtime.test/src/jdk/vm/ci/runtime/test/RedefineClassTest.java @ 22672:1bbd4a7c274b
Rename jdk.internal.jvmci to jdk.vm.ci
author | Tom Rodriguez <tom.rodriguez@oracle.com> |
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date | Thu, 08 Oct 2015 17:28:41 -0700 |
parents | jvmci/jdk.internal.jvmci.runtime.test/src/jdk/internal/jvmci/runtime/test/RedefineClassTest.java@ec96f33a101d |
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1 /* |
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2 * Copyright (c) 2011, 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 package jdk.vm.ci.runtime.test; |
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24 |
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25 import static org.junit.Assume.assumeTrue; |
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26 |
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27 import java.io.FileOutputStream; |
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28 import java.io.IOException; |
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29 import java.io.InputStream; |
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30 import java.lang.instrument.ClassFileTransformer; |
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31 import java.lang.instrument.IllegalClassFormatException; |
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32 import java.lang.instrument.Instrumentation; |
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33 import java.lang.management.ManagementFactory; |
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34 import java.lang.reflect.Method; |
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35 import java.nio.file.Files; |
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36 import java.nio.file.Path; |
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37 import java.security.ProtectionDomain; |
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38 import java.util.Arrays; |
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39 import java.util.jar.Attributes; |
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40 import java.util.jar.JarEntry; |
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41 import java.util.jar.JarOutputStream; |
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42 import java.util.jar.Manifest; |
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43 |
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44 import javax.tools.ToolProvider; |
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45 |
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46 import jdk.vm.ci.meta.ResolvedJavaMethod; |
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47 |
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48 import org.junit.Assert; |
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49 import org.junit.Test; |
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50 |
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51 /** |
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52 * Tests that {@link ResolvedJavaMethod}s are safe in the context of class redefinition being used |
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53 * to redefine the method to which they refer. |
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54 */ |
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55 public class RedefineClassTest extends TypeUniverse { |
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56 |
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57 static class Foo { |
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58 public static Object getName() { |
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59 return "foo"; |
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60 } |
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61 } |
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62 |
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63 @Test |
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64 public void test() throws Throwable { |
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65 |
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66 Method fooMethod = Foo.class.getDeclaredMethod("getName"); |
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67 |
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68 ResolvedJavaMethod foo1 = metaAccess.lookupJavaMethod(fooMethod); |
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69 ResolvedJavaMethod foo2 = metaAccess.lookupJavaMethod(fooMethod); |
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70 |
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71 String foo1Code = Arrays.toString(foo1.getCode()); |
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72 String foo2Code = Arrays.toString(foo2.getCode()); |
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73 |
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74 Assert.assertEquals("foo", Foo.getName()); |
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75 |
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76 redefineFoo(); |
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77 System.gc(); |
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78 |
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79 // Make sure the transformation happened |
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80 Assert.assertEquals("bar", Foo.getName()); |
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81 |
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82 Assert.assertEquals(foo1Code, Arrays.toString(foo1.getCode())); |
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83 Assert.assertEquals(foo2Code, Arrays.toString(foo1.getCode())); |
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84 } |
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85 |
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86 /** |
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87 * Adds the class file bytes for a given class to a JAR stream. |
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88 */ |
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89 static void add(JarOutputStream jar, Class<?> c) throws IOException { |
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90 String name = c.getName(); |
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91 String classAsPath = name.replace('.', '/') + ".class"; |
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92 jar.putNextEntry(new JarEntry(classAsPath)); |
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93 |
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94 InputStream stream = c.getClassLoader().getResourceAsStream(classAsPath); |
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95 |
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96 int nRead; |
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97 byte[] buf = new byte[1024]; |
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98 while ((nRead = stream.read(buf, 0, buf.length)) != -1) { |
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99 jar.write(buf, 0, nRead); |
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100 } |
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101 |
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102 jar.closeEntry(); |
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103 } |
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104 |
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105 protected void redefineFoo() throws Exception { |
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106 Manifest manifest = new Manifest(); |
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107 manifest.getMainAttributes().put(Attributes.Name.MANIFEST_VERSION, "1.0"); |
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108 Attributes mainAttrs = manifest.getMainAttributes(); |
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109 mainAttrs.putValue("Agent-Class", FooAgent.class.getName()); |
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110 mainAttrs.putValue("Can-Redefine-Classes", "true"); |
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111 mainAttrs.putValue("Can-Retransform-Classes", "true"); |
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112 |
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113 Path jar = Files.createTempFile("myagent", ".jar"); |
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114 try { |
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115 JarOutputStream jarStream = new JarOutputStream(new FileOutputStream(jar.toFile()), manifest); |
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116 add(jarStream, FooAgent.class); |
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117 add(jarStream, FooTransformer.class); |
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118 jarStream.close(); |
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119 |
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120 loadAgent(jar); |
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121 } finally { |
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122 Files.deleteIfExists(jar); |
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123 } |
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124 } |
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125 |
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126 public static void loadAgent(Path agent) throws Exception { |
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127 String vmName = ManagementFactory.getRuntimeMXBean().getName(); |
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128 int p = vmName.indexOf('@'); |
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129 assumeTrue("VM name not in <pid>@<host> format: " + vmName, p != -1); |
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130 String pid = vmName.substring(0, p); |
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131 ClassLoader cl = ToolProvider.getSystemToolClassLoader(); |
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132 Class<?> c = Class.forName("com.sun.tools.attach.VirtualMachine", true, cl); |
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133 Method attach = c.getDeclaredMethod("attach", String.class); |
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134 Method loadAgent = c.getDeclaredMethod("loadAgent", String.class, String.class); |
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135 Method detach = c.getDeclaredMethod("detach"); |
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136 Object vm = attach.invoke(null, pid); |
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137 loadAgent.invoke(vm, agent.toString(), ""); |
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138 detach.invoke(vm); |
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139 } |
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140 |
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141 public static class FooAgent { |
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142 |
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143 public static void agentmain(@SuppressWarnings("unused") String args, Instrumentation inst) throws Exception { |
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144 if (inst.isRedefineClassesSupported() && inst.isRetransformClassesSupported()) { |
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145 inst.addTransformer(new FooTransformer(), true); |
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146 Class<?>[] allClasses = inst.getAllLoadedClasses(); |
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147 for (int i = 0; i < allClasses.length; i++) { |
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148 Class<?> c = allClasses[i]; |
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149 if (c == Foo.class) { |
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150 inst.retransformClasses(new Class<?>[]{c}); |
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151 } |
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152 } |
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153 } |
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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 * This transformer replaces the first instance of the constant "foo" in the class file for |
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159 * {@link Foo} with "bar". |
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160 */ |
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161 static class FooTransformer implements ClassFileTransformer { |
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162 |
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163 @Override |
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164 public byte[] transform(ClassLoader cl, String className, Class<?> classBeingRedefined, ProtectionDomain protectionDomain, byte[] classfileBuffer) throws IllegalClassFormatException { |
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165 if (Foo.class.equals(classBeingRedefined)) { |
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166 String cf = new String(classfileBuffer); |
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167 int i = cf.indexOf("foo"); |
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168 Assert.assertTrue("cannot find \"foo\" constant in " + Foo.class.getSimpleName() + "'s class file", i > 0); |
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169 classfileBuffer[i] = 'b'; |
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170 classfileBuffer[i + 1] = 'a'; |
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171 classfileBuffer[i + 2] = 'r'; |
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172 } |
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173 return classfileBuffer; |
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174 } |
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175 } |
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176 } |