Mercurial > hg > truffle
annotate test/compiler/jsr292/RedefineMethodUsedByMultipleMethodHandles.java @ 20822:8ad82587f08d
Allow scaling factors in integer options; add support for Long values in addition to Integer values
author | Christian Wimmer <christian.wimmer@oracle.com> |
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date | Wed, 08 Apr 2015 21:59:42 -0700 |
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rev | line source |
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1 /* |
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2 * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. |
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8 * |
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9 * This code is distributed in the hope that it will be useful, but WITHOUT |
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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12 * version 2 for more details (a copy is included in the LICENSE file that |
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13 * accompanied this code). |
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14 * |
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15 * You should have received a copy of the GNU General Public License version |
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16 * 2 along with this work; if not, write to the Free Software Foundation, |
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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18 * |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
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22 */ |
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23 |
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24 /** |
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25 * @test |
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26 * @bug 8042235 |
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27 * @summary redefining method used by multiple MethodHandles crashes VM |
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28 * @compile -XDignore.symbol.file RedefineMethodUsedByMultipleMethodHandles.java |
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29 * @run main RedefineMethodUsedByMultipleMethodHandles |
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30 */ |
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31 |
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32 import java.io.*; |
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33 import java.lang.instrument.*; |
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34 import java.lang.invoke.*; |
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35 import java.lang.invoke.MethodHandles.Lookup; |
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36 import java.lang.management.*; |
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37 import java.lang.reflect.*; |
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38 import java.nio.file.*; |
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39 import java.security.*; |
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40 import java.util.jar.*; |
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41 |
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42 import javax.tools.*; |
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43 |
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44 import jdk.internal.org.objectweb.asm.*; |
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45 |
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46 public class RedefineMethodUsedByMultipleMethodHandles { |
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47 |
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48 static class Foo { |
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49 public static Object getName() { |
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50 return "foo"; |
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51 } |
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52 } |
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53 |
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54 public static void main(String[] args) throws Throwable { |
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55 |
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56 Lookup lookup = MethodHandles.lookup(); |
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57 Method fooMethod = Foo.class.getDeclaredMethod("getName"); |
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58 |
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59 // fooMH2 displaces fooMH1 from the MemberNamesTable |
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60 MethodHandle fooMH1 = lookup.unreflect(fooMethod); |
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61 MethodHandle fooMH2 = lookup.unreflect(fooMethod); |
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62 |
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63 System.out.println("fooMH1.invoke = " + fooMH1.invokeExact()); |
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64 System.out.println("fooMH2.invoke = " + fooMH2.invokeExact()); |
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65 |
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66 // Redefining Foo.getName() causes vmtarget to be updated |
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67 // in fooMH2 but not fooMH1 |
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68 redefineFoo(); |
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69 |
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70 // Full GC causes fooMH1.vmtarget to be deallocated |
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71 System.gc(); |
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72 |
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73 // Calling fooMH1.vmtarget crashes the VM |
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74 System.out.println("fooMH1.invoke = " + fooMH1.invokeExact()); |
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75 } |
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76 |
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77 /** |
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78 * Adds the class file bytes for {@code c} to {@code jar}. |
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79 */ |
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80 static void add(JarOutputStream jar, Class<?> c) throws IOException { |
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81 String classAsPath = c.getName().replace('.', '/') + ".class"; |
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82 jar.putNextEntry(new JarEntry(classAsPath)); |
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83 InputStream stream = c.getClassLoader().getResourceAsStream(classAsPath); |
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84 |
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85 int b; |
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86 while ((b = stream.read()) != -1) { |
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87 jar.write(b); |
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88 } |
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89 } |
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90 |
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91 static void redefineFoo() throws Exception { |
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92 Manifest manifest = new Manifest(); |
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93 manifest.getMainAttributes().put(Attributes.Name.MANIFEST_VERSION, "1.0"); |
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94 Attributes mainAttrs = manifest.getMainAttributes(); |
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95 mainAttrs.putValue("Agent-Class", FooAgent.class.getName()); |
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96 mainAttrs.putValue("Can-Redefine-Classes", "true"); |
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97 mainAttrs.putValue("Can-Retransform-Classes", "true"); |
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98 |
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99 Path jar = Files.createTempFile("myagent", ".jar"); |
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100 try { |
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101 JarOutputStream jarStream = new JarOutputStream(new FileOutputStream(jar.toFile()), manifest); |
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102 add(jarStream, FooAgent.class); |
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103 add(jarStream, FooTransformer.class); |
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104 jarStream.close(); |
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105 runAgent(jar); |
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106 } finally { |
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107 Files.deleteIfExists(jar); |
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108 } |
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109 } |
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110 |
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111 public static void runAgent(Path agent) throws Exception { |
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112 String vmName = ManagementFactory.getRuntimeMXBean().getName(); |
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113 int p = vmName.indexOf('@'); |
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114 assert p != -1 : "VM name not in <pid>@<host> format: " + vmName; |
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115 String pid = vmName.substring(0, p); |
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116 ClassLoader cl = ToolProvider.getSystemToolClassLoader(); |
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117 Class<?> c = Class.forName("com.sun.tools.attach.VirtualMachine", true, cl); |
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118 Method attach = c.getDeclaredMethod("attach", String.class); |
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119 Method loadAgent = c.getDeclaredMethod("loadAgent", String.class); |
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120 Method detach = c.getDeclaredMethod("detach"); |
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121 Object vm = attach.invoke(null, pid); |
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122 loadAgent.invoke(vm, agent.toString()); |
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123 detach.invoke(vm); |
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124 } |
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125 |
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126 public static class FooAgent { |
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127 |
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128 public static void agentmain(@SuppressWarnings("unused") String args, Instrumentation inst) throws Exception { |
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129 assert inst.isRedefineClassesSupported(); |
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130 assert inst.isRetransformClassesSupported(); |
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131 inst.addTransformer(new FooTransformer(), true); |
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132 Class<?>[] classes = inst.getAllLoadedClasses(); |
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133 for (int i = 0; i < classes.length; i++) { |
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134 Class<?> c = classes[i]; |
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135 if (c == Foo.class) { |
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136 inst.retransformClasses(new Class[]{c}); |
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137 } |
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138 } |
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139 } |
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140 } |
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141 |
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142 static class FooTransformer implements ClassFileTransformer { |
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143 |
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144 @Override |
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145 public byte[] transform(ClassLoader cl, String className, Class<?> classBeingRedefined, ProtectionDomain protectionDomain, byte[] classfileBuffer) throws IllegalClassFormatException { |
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146 if (Foo.class.equals(classBeingRedefined)) { |
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147 System.out.println("redefining " + classBeingRedefined); |
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148 ClassReader cr = new ClassReader(classfileBuffer); |
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149 ClassWriter cw = new ClassWriter(cr, ClassWriter.COMPUTE_FRAMES); |
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150 ClassVisitor adapter = new ClassVisitor(Opcodes.ASM5, cw) { |
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151 @Override |
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152 public MethodVisitor visitMethod(int access, String base, String desc, String signature, String[] exceptions) { |
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153 MethodVisitor mv = cv.visitMethod(access, base, desc, signature, exceptions); |
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154 if (mv != null) { |
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155 mv = new MethodVisitor(Opcodes.ASM5, mv) { |
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156 @Override |
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157 public void visitLdcInsn(Object cst) { |
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158 System.out.println("replacing \"" + cst + "\" with \"bar\""); |
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159 mv.visitLdcInsn("bar"); |
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160 } |
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161 }; |
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162 } |
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163 return mv; |
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164 } |
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165 }; |
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166 |
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167 cr.accept(adapter, ClassReader.SKIP_FRAMES); |
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168 cw.visitEnd(); |
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169 return cw.toByteArray(); |
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170 } |
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171 return classfileBuffer; |
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172 } |
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173 } |
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174 } |