189 lines
7.5 KiB
Java
189 lines
7.5 KiB
Java
/*
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* Copyright (c) 2014, 2020, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/**
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* @test
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* @bug 8042235
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* @summary redefining method used by multiple MethodHandles crashes VM
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* @library /
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* @modules java.base/jdk.internal.org.objectweb.asm
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* java.compiler
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* java.instrument
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* jdk.attach
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* @requires vm.jvmti
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*
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* @run main/othervm -Djdk.attach.allowAttachSelf compiler.jsr292.RedefineMethodUsedByMultipleMethodHandles
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*/
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package compiler.jsr292;
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import jdk.internal.org.objectweb.asm.ClassReader;
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import jdk.internal.org.objectweb.asm.ClassVisitor;
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import jdk.internal.org.objectweb.asm.ClassWriter;
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import jdk.internal.org.objectweb.asm.MethodVisitor;
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import jdk.internal.org.objectweb.asm.Opcodes;
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import java.io.FileOutputStream;
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import java.io.IOException;
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import java.io.InputStream;
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import java.lang.instrument.ClassFileTransformer;
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import java.lang.instrument.IllegalClassFormatException;
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import java.lang.instrument.Instrumentation;
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import java.lang.invoke.MethodHandle;
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import java.lang.invoke.MethodHandles;
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import java.lang.invoke.MethodHandles.Lookup;
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import java.lang.reflect.Method;
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import java.nio.file.Files;
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import java.nio.file.Path;
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import java.security.ProtectionDomain;
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import java.util.jar.Attributes;
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import java.util.jar.JarEntry;
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import java.util.jar.JarOutputStream;
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import java.util.jar.Manifest;
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public class RedefineMethodUsedByMultipleMethodHandles {
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static class Foo {
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public static Object getName() {
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return "foo";
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}
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}
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public static void main(String[] args) throws Throwable {
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Lookup lookup = MethodHandles.lookup();
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Method fooMethod = Foo.class.getDeclaredMethod("getName");
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// fooMH2 displaces fooMH1 from the MemberNamesTable
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MethodHandle fooMH1 = lookup.unreflect(fooMethod);
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MethodHandle fooMH2 = lookup.unreflect(fooMethod);
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System.out.println("fooMH1.invoke = " + fooMH1.invokeExact());
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System.out.println("fooMH2.invoke = " + fooMH2.invokeExact());
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// Redefining Foo.getName() causes vmtarget to be updated
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// in fooMH2 but not fooMH1
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redefineFoo();
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// Full GC causes fooMH1.vmtarget to be deallocated
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System.gc();
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// Calling fooMH1.vmtarget crashes the VM
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System.out.println("fooMH1.invoke = " + fooMH1.invokeExact());
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}
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/**
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* Adds the class file bytes for {@code c} to {@code jar}.
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*/
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static void add(JarOutputStream jar, Class<?> c) throws IOException {
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String classAsPath = c.getName().replace('.', '/') + ".class";
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jar.putNextEntry(new JarEntry(classAsPath));
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InputStream stream = c.getClassLoader().getResourceAsStream(classAsPath);
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int b;
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while ((b = stream.read()) != -1) {
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jar.write(b);
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}
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}
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static void redefineFoo() throws Exception {
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Manifest manifest = new Manifest();
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manifest.getMainAttributes().put(Attributes.Name.MANIFEST_VERSION, "1.0");
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Attributes mainAttrs = manifest.getMainAttributes();
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mainAttrs.putValue("Agent-Class", FooAgent.class.getName());
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mainAttrs.putValue("Can-Redefine-Classes", "true");
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mainAttrs.putValue("Can-Retransform-Classes", "true");
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// The jar file will be added to the system classloader search path. It is not safe
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// to delete it while the JVM is running, so make sure to create it in the test
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// directory so it will be cleaned up by the test harness.
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Path jar = Files.createTempFile(Path.of(""), "myagent", ".jar");
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JarOutputStream jarStream = new JarOutputStream(new FileOutputStream(jar.toFile()), manifest);
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add(jarStream, FooAgent.class);
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add(jarStream, FooTransformer.class);
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jarStream.close();
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runAgent(jar);
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}
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public static void runAgent(Path agent) throws Exception {
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String pid = Long.toString(ProcessHandle.current().pid());
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ClassLoader cl = ClassLoader.getSystemClassLoader();
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Class<?> c = Class.forName("com.sun.tools.attach.VirtualMachine", true, cl);
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Method attach = c.getDeclaredMethod("attach", String.class);
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Method loadAgent = c.getDeclaredMethod("loadAgent", String.class);
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Method detach = c.getDeclaredMethod("detach");
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Object vm = attach.invoke(null, pid);
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loadAgent.invoke(vm, agent.toString());
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detach.invoke(vm);
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}
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public static class FooAgent {
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public static void agentmain(@SuppressWarnings("unused") String args, Instrumentation inst) throws Exception {
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assert inst.isRedefineClassesSupported();
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assert inst.isRetransformClassesSupported();
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inst.addTransformer(new FooTransformer(), true);
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Class<?>[] classes = inst.getAllLoadedClasses();
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for (int i = 0; i < classes.length; i++) {
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Class<?> c = classes[i];
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if (c == Foo.class) {
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inst.retransformClasses(new Class[]{c});
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}
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}
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}
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}
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static class FooTransformer implements ClassFileTransformer {
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@Override
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public byte[] transform(ClassLoader cl, String className, Class<?> classBeingRedefined, ProtectionDomain protectionDomain, byte[] classfileBuffer) throws IllegalClassFormatException {
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if (Foo.class.equals(classBeingRedefined)) {
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System.out.println("redefining " + classBeingRedefined);
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ClassReader cr = new ClassReader(classfileBuffer);
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ClassWriter cw = new ClassWriter(cr, ClassWriter.COMPUTE_FRAMES);
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ClassVisitor adapter = new ClassVisitor(Opcodes.ASM5, cw) {
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@Override
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public MethodVisitor visitMethod(int access, String base, String desc, String signature, String[] exceptions) {
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MethodVisitor mv = cv.visitMethod(access, base, desc, signature, exceptions);
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if (mv != null) {
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mv = new MethodVisitor(Opcodes.ASM5, mv) {
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@Override
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public void visitLdcInsn(Object cst) {
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System.out.println("replacing \"" + cst + "\" with \"bar\"");
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mv.visitLdcInsn("bar");
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}
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};
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}
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return mv;
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}
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};
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cr.accept(adapter, ClassReader.SKIP_FRAMES);
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cw.visitEnd();
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return cw.toByteArray();
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}
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return classfileBuffer;
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}
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}
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}
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