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annotate jvmci/jdk.vm.ci.runtime.test/src/jdk/vm/ci/runtime/test/RedefineClassTest.java @ 24234:ea6f94ab283b default tip

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Added tag jvmci-0.36 for changeset 8128b98d4736
author Gilles Duboscq <gilles.m.duboscq@oracle.com>
date Mon, 18 Sep 2017 18:49:45 +0200
parents 1bbd4a7c274b
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 }