1 /*
2 * Copyright (c) 2014, 2015, 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 8042235
27 * @summary redefining method used by multiple MethodHandles crashes VM
28 * @library /
29 * @modules java.base/jdk.internal.org.objectweb.asm
30 * java.compiler
31 * java.instrument
32 * java.management
33 * jdk.attach
34 *
35 * @run main/othervm -Djdk.attach.allowAttachSelf compiler.jsr292.RedefineMethodUsedByMultipleMethodHandles
36 */
37
38 package compiler.jsr292;
39
40 import jdk.internal.org.objectweb.asm.ClassReader;
41 import jdk.internal.org.objectweb.asm.ClassVisitor;
42 import jdk.internal.org.objectweb.asm.ClassWriter;
43 import jdk.internal.org.objectweb.asm.MethodVisitor;
44 import jdk.internal.org.objectweb.asm.Opcodes;
45
46 import java.io.FileOutputStream;
47 import java.io.IOException;
48 import java.io.InputStream;
49 import java.lang.instrument.ClassFileTransformer;
50 import java.lang.instrument.IllegalClassFormatException;
51 import java.lang.instrument.Instrumentation;
52 import java.lang.invoke.MethodHandle;
53 import java.lang.invoke.MethodHandles;
54 import java.lang.invoke.MethodHandles.Lookup;
55 import java.lang.management.ManagementFactory;
56 import java.lang.reflect.Method;
57 import java.nio.file.Files;
58 import java.nio.file.Path;
59 import java.security.ProtectionDomain;
60 import java.util.jar.Attributes;
61 import java.util.jar.JarEntry;
62 import java.util.jar.JarOutputStream;
63 import java.util.jar.Manifest;
64
65 public class RedefineMethodUsedByMultipleMethodHandles {
66
67 static class Foo {
68 public static Object getName() {
69 return "foo";
70 }
71 }
72
73 public static void main(String[] args) throws Throwable {
74
75 Lookup lookup = MethodHandles.lookup();
76 Method fooMethod = Foo.class.getDeclaredMethod("getName");
77
78 // fooMH2 displaces fooMH1 from the MemberNamesTable
79 MethodHandle fooMH1 = lookup.unreflect(fooMethod);
80 MethodHandle fooMH2 = lookup.unreflect(fooMethod);
81
82 System.out.println("fooMH1.invoke = " + fooMH1.invokeExact());
83 System.out.println("fooMH2.invoke = " + fooMH2.invokeExact());
84
85 // Redefining Foo.getName() causes vmtarget to be updated
86 // in fooMH2 but not fooMH1
87 redefineFoo();
88
89 // Full GC causes fooMH1.vmtarget to be deallocated
90 System.gc();
91
92 // Calling fooMH1.vmtarget crashes the VM
93 System.out.println("fooMH1.invoke = " + fooMH1.invokeExact());
94 }
95
96 /**
97 * Adds the class file bytes for {@code c} to {@code jar}.
98 */
99 static void add(JarOutputStream jar, Class<?> c) throws IOException {
100 String classAsPath = c.getName().replace('.', '/') + ".class";
101 jar.putNextEntry(new JarEntry(classAsPath));
102 InputStream stream = c.getClassLoader().getResourceAsStream(classAsPath);
103
104 int b;
105 while ((b = stream.read()) != -1) {
106 jar.write(b);
107 }
108 }
109
110 static void redefineFoo() throws Exception {
111 Manifest manifest = new Manifest();
112 manifest.getMainAttributes().put(Attributes.Name.MANIFEST_VERSION, "1.0");
113 Attributes mainAttrs = manifest.getMainAttributes();
114 mainAttrs.putValue("Agent-Class", FooAgent.class.getName());
115 mainAttrs.putValue("Can-Redefine-Classes", "true");
116 mainAttrs.putValue("Can-Retransform-Classes", "true");
117
118 Path jar = Files.createTempFile("myagent", ".jar");
119 try {
120 JarOutputStream jarStream = new JarOutputStream(new FileOutputStream(jar.toFile()), manifest);
121 add(jarStream, FooAgent.class);
122 add(jarStream, FooTransformer.class);
123 jarStream.close();
124 runAgent(jar);
125 } finally {
126 Files.deleteIfExists(jar);
127 }
128 }
129
130 public static void runAgent(Path agent) throws Exception {
131 String vmName = ManagementFactory.getRuntimeMXBean().getName();
132 int p = vmName.indexOf('@');
133 assert p != -1 : "VM name not in <pid>@<host> format: " + vmName;
134 String pid = vmName.substring(0, p);
135 ClassLoader cl = ClassLoader.getSystemClassLoader();
136 Class<?> c = Class.forName("com.sun.tools.attach.VirtualMachine", true, cl);
137 Method attach = c.getDeclaredMethod("attach", String.class);
138 Method loadAgent = c.getDeclaredMethod("loadAgent", String.class);
139 Method detach = c.getDeclaredMethod("detach");
140 Object vm = attach.invoke(null, pid);
141 loadAgent.invoke(vm, agent.toString());
142 detach.invoke(vm);
143 }
144
145 public static class FooAgent {
146
147 public static void agentmain(@SuppressWarnings("unused") String args, Instrumentation inst) throws Exception {
148 assert inst.isRedefineClassesSupported();
149 assert inst.isRetransformClassesSupported();
150 inst.addTransformer(new FooTransformer(), true);
151 Class<?>[] classes = inst.getAllLoadedClasses();
152 for (int i = 0; i < classes.length; i++) {
153 Class<?> c = classes[i];
154 if (c == Foo.class) {
155 inst.retransformClasses(new Class[]{c});
156 }
157 }
158 }
159 }
160
161 static class FooTransformer implements ClassFileTransformer {
162
163 @Override
164 public byte[] transform(ClassLoader cl, String className, Class<?> classBeingRedefined, ProtectionDomain protectionDomain, byte[] classfileBuffer) throws IllegalClassFormatException {
165 if (Foo.class.equals(classBeingRedefined)) {
166 System.out.println("redefining " + classBeingRedefined);
167 ClassReader cr = new ClassReader(classfileBuffer);
168 ClassWriter cw = new ClassWriter(cr, ClassWriter.COMPUTE_FRAMES);
169 ClassVisitor adapter = new ClassVisitor(Opcodes.ASM5, cw) {
170 @Override
171 public MethodVisitor visitMethod(int access, String base, String desc, String signature, String[] exceptions) {
172 MethodVisitor mv = cv.visitMethod(access, base, desc, signature, exceptions);
173 if (mv != null) {
174 mv = new MethodVisitor(Opcodes.ASM5, mv) {
175 @Override
176 public void visitLdcInsn(Object cst) {
177 System.out.println("replacing \"" + cst + "\" with \"bar\"");
178 mv.visitLdcInsn("bar");
179 }
180 };
181 }
182 return mv;
183 }
184 };
185
186 cr.accept(adapter, ClassReader.SKIP_FRAMES);
187 cw.visitEnd();
188 return cw.toByteArray();
189 }
190 return classfileBuffer;
191 }
192 }
193 }