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| 1 | +/* |
| 2 | + * Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved. |
| 3 | + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 | + * |
| 5 | + * This code is free software; you can redistribute it and/or modify it |
| 6 | + * under the terms of the GNU General Public License version 2 only, as |
| 7 | + * published by the Free Software Foundation. |
| 8 | + * |
| 9 | + * This code is distributed in the hope that it will be useful, but WITHOUT |
| 10 | + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 11 | + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 12 | + * version 2 for more details (a copy is included in the LICENSE file that |
| 13 | + * accompanied this code). |
| 14 | + * |
| 15 | + * You should have received a copy of the GNU General Public License version |
| 16 | + * 2 along with this work; if not, write to the Free Software Foundation, |
| 17 | + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| 18 | + * |
| 19 | + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| 20 | + * or visit www.oracle.com if you need additional information or have any |
| 21 | + * questions. |
| 22 | + */ |
| 23 | + |
| 24 | +/* |
| 25 | + * @test |
| 26 | + * @bug 8232613 |
| 27 | + * @summary Ensure Object natives stay registered after redefinition |
| 28 | + * @library /test/lib |
| 29 | + * @modules java.base/jdk.internal.misc |
| 30 | + * java.base/jdk.internal.org.objectweb.asm |
| 31 | + * java.compiler |
| 32 | + * java.instrument |
| 33 | + * jdk.jartool/sun.tools.jar |
| 34 | + * @run main RedefineObject buildagent |
| 35 | + * @run main/othervm -javaagent:redefineagent.jar RedefineObject |
| 36 | + */ |
| 37 | + |
| 38 | +import static jdk.test.lib.Asserts.assertTrue; |
| 39 | +import java.io.FileNotFoundException; |
| 40 | +import java.io.PrintWriter; |
| 41 | +import java.lang.RuntimeException; |
| 42 | +import java.lang.instrument.ClassFileTransformer; |
| 43 | +import java.lang.instrument.IllegalClassFormatException; |
| 44 | +import java.lang.instrument.Instrumentation; |
| 45 | +import java.lang.instrument.UnmodifiableClassException; |
| 46 | +import java.security.ProtectionDomain; |
| 47 | +import java.util.Arrays; |
| 48 | + |
| 49 | +import jdk.internal.org.objectweb.asm.ClassReader; |
| 50 | +import jdk.internal.org.objectweb.asm.ClassVisitor; |
| 51 | +import jdk.internal.org.objectweb.asm.ClassWriter; |
| 52 | + |
| 53 | +import static jdk.internal.org.objectweb.asm.Opcodes.ASM6; |
| 54 | +import static jdk.internal.org.objectweb.asm.Opcodes.V1_8; |
| 55 | + |
| 56 | +public class RedefineObject { |
| 57 | + |
| 58 | + static Instrumentation inst; |
| 59 | + |
| 60 | + public static void premain(String agentArgs, Instrumentation inst) { |
| 61 | + RedefineObject.inst = inst; |
| 62 | + } |
| 63 | + |
| 64 | + static class Transformer implements ClassFileTransformer { |
| 65 | + |
| 66 | + public byte[] asm(ClassLoader loader, String className, |
| 67 | + Class<?> classBeingRedefined, |
| 68 | + ProtectionDomain protectionDomain, byte[] classfileBuffer) |
| 69 | + throws IllegalClassFormatException { |
| 70 | + ClassWriter cw = new ClassWriter(0); |
| 71 | + // Force an older ASM to force a bytecode update |
| 72 | + ClassVisitor cv = new DummyClassVisitor(ASM6, cw) { }; |
| 73 | + ClassReader cr = new ClassReader(classfileBuffer); |
| 74 | + cr.accept(cv, 0); |
| 75 | + byte[] bytes = cw.toByteArray(); |
| 76 | + return bytes; |
| 77 | + } |
| 78 | + |
| 79 | + public class DummyClassVisitor extends ClassVisitor { |
| 80 | + |
| 81 | + public DummyClassVisitor(int api, ClassVisitor cv) { |
| 82 | + super(api, cv); |
| 83 | + } |
| 84 | + |
| 85 | + public void visit( |
| 86 | + final int version, |
| 87 | + final int access, |
| 88 | + final String name, |
| 89 | + final String signature, |
| 90 | + final String superName, |
| 91 | + final String[] interfaces) { |
| 92 | + // Artificially lower to JDK 8 version to force a redefine |
| 93 | + cv.visit(V1_8, access, name, signature, superName, interfaces); |
| 94 | + } |
| 95 | + } |
| 96 | + |
| 97 | + @Override public byte[] transform(ClassLoader loader, String className, |
| 98 | + Class<?> classBeingRedefined, |
| 99 | + ProtectionDomain protectionDomain, byte[] classfileBuffer) |
| 100 | + throws IllegalClassFormatException { |
| 101 | + |
| 102 | + if (className.contains("java/lang/Object")) { |
| 103 | + try { |
| 104 | + // Here we remove and re-add the dummy fields. This shuffles the constant pool |
| 105 | + return asm(loader, className, classBeingRedefined, protectionDomain, classfileBuffer); |
| 106 | + } catch (Throwable e) { |
| 107 | + // The retransform native code that called this method does not propagate |
| 108 | + // exceptions. Instead of getting an uninformative generic error, catch |
| 109 | + // problems here and print it, then exit. |
| 110 | + e.printStackTrace(); |
| 111 | + System.exit(1); |
| 112 | + } |
| 113 | + } |
| 114 | + return null; |
| 115 | + } |
| 116 | + } |
| 117 | + |
| 118 | + private static void buildAgent() { |
| 119 | + try { |
| 120 | + ClassFileInstaller.main("RedefineObject"); |
| 121 | + } catch (Exception e) { |
| 122 | + throw new RuntimeException("Could not write agent classfile", e); |
| 123 | + } |
| 124 | + |
| 125 | + try { |
| 126 | + PrintWriter pw = new PrintWriter("MANIFEST.MF"); |
| 127 | + pw.println("Premain-Class: RedefineObject"); |
| 128 | + pw.println("Agent-Class: RedefineObject"); |
| 129 | + pw.println("Can-Retransform-Classes: true"); |
| 130 | + pw.close(); |
| 131 | + } catch (FileNotFoundException e) { |
| 132 | + throw new RuntimeException("Could not write manifest file for the agent", e); |
| 133 | + } |
| 134 | + |
| 135 | + sun.tools.jar.Main jarTool = new sun.tools.jar.Main(System.out, System.err, "jar"); |
| 136 | + if (!jarTool.run(new String[] { "-cmf", "MANIFEST.MF", "redefineagent.jar", "RedefineObject.class" })) { |
| 137 | + throw new RuntimeException("Could not write the agent jar file"); |
| 138 | + } |
| 139 | + } |
| 140 | + |
| 141 | + public static void main(String[] args) throws Exception { |
| 142 | + |
| 143 | + int objHash = System.identityHashCode(Object.class); |
| 144 | + System.out.println("Object hashCode: " + objHash); |
| 145 | + if (args.length == 1 && args[0].equals("buildagent")) { |
| 146 | + buildAgent(); |
| 147 | + return; |
| 148 | + } |
| 149 | + |
| 150 | + if (inst == null) { |
| 151 | + throw new RuntimeException("Instrumentation object was null"); |
| 152 | + } |
| 153 | + |
| 154 | + try { |
| 155 | + inst.addTransformer(new RedefineObject.Transformer(), true); |
| 156 | + inst.retransformClasses(Object.class); |
| 157 | + } catch (UnmodifiableClassException e) { |
| 158 | + throw new RuntimeException(e); |
| 159 | + } |
| 160 | + |
| 161 | + // Exercise native methods on Object after transform |
| 162 | + Object b = new Object(); |
| 163 | + b.hashCode(); |
| 164 | + |
| 165 | + C c = new C(); |
| 166 | + assertTrue(c.hashCode() != c.clone().hashCode() || c != c.clone()); |
| 167 | + assertTrue(c.clone() instanceof C); |
| 168 | + c = (C)c.clone(); // native method on new Object |
| 169 | + } |
| 170 | + |
| 171 | + private static class C implements Cloneable { |
| 172 | + @Override |
| 173 | + protected Object clone() throws CloneNotSupportedException { |
| 174 | + return super.clone(); |
| 175 | + } |
| 176 | + } |
| 177 | +} |
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