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annotate test/compiler/jsr292/RedefineMethodUsedByMultipleMethodHandles.java @ 20677:fe34c5ab0b35

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8042235: redefining method used by multiple MethodHandles crashes VM Summary: note all MemberNames created on internal list for adjusting method entries. Reviewed-by: sspitsyn, dcubed, lfoltan
author coleenp
date Wed, 19 Nov 2014 13:02:11 -0500
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20677
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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 }