247 lines
9.4 KiB
Java
247 lines
9.4 KiB
Java
/*
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* Copyright (c) 2014, 2015, 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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* @compile -XDignore.symbol.file RedefineMethodUsedByMultipleMethodHandlesNoASM.java
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* @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:+EnableInvokeDynamic RedefineMethodUsedByMultipleMethodHandlesNoASM
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*/
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import java.io.*;
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import java.lang.instrument.*;
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import java.lang.invoke.*;
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import java.lang.invoke.MethodHandles.Lookup;
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import java.lang.management.*;
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import java.lang.reflect.*;
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import java.nio.file.*;
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import java.security.*;
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import java.util.jar.*;
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import javax.tools.*;
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public class RedefineMethodUsedByMultipleMethodHandlesNoASM {
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static class Foo {
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public static Object getName() {
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int fooInt = 1;
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if (true) {
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// We "just know" that this creates bytecodes:
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// bipush 0x7 0x10 0x7
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// ishl 0x78
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fooInt <<= 0x7;
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}
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return "foo" + fooInt;
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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("Foo.getName() = " + Foo.getName());
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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 on JDK8, on JDK7 we see
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// the wrong method invoked, we execute the old code.
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Object newResult = fooMH1.invokeExact();
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System.out.println("fooMH1.invoke = " + fooMH1.invokeExact());
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if (!((String) newResult).equals("foo32")) {
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throw new RuntimeException("failed, fooMH1 invoke gets '" + newResult + "'");
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}
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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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Path jar = Files.createTempFile("myagent", ".jar");
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try {
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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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} finally {
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Files.deleteIfExists(jar);
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}
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}
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public static void runAgent(Path agent) throws Exception {
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String vmName = ManagementFactory.getRuntimeMXBean().getName();
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int p = vmName.indexOf('@');
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assert p != -1 : "VM name not in <pid>@<host> format: " + vmName;
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String pid = vmName.substring(0, p);
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ClassLoader cl = ToolProvider.getSystemToolClassLoader();
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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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/**
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* This method will only be called on the class Foo, above, and that class
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* only has the method getName().
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* Avoid using the objectweb ASM library as we do in jdk8, by
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* looking for a specific bytecode pattern (which this method does not really
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* understand).
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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,
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byte[] classfileBuffer) throws IllegalClassFormatException {
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if (Foo.class.equals(classBeingRedefined)) {
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try {
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System.out.println("redefining " + classBeingRedefined);
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ByteArrayOutputStream baos = new ByteArrayOutputStream();
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InputStream is = new ByteArrayInputStream(classfileBuffer);
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copyWithSubstitution(is, new byte[] {(byte)0x10,(byte)0x07,(byte)0x78},
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new byte[] {(byte)0x10,(byte)0x05,(byte)0x78},
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baos);
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return baos.toByteArray();
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} catch(Exception e) {
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e.printStackTrace();
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}
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}
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return classfileBuffer;
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}
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/**
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* Copy bytes from a Reader to an OutputStream. If a sequence of bytes
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* matches the given oldBytes byte array, write the newBytes array instead.
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*/
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public void copyWithSubstitution(InputStream is, byte[] oldBytes, byte [] newBytes, OutputStream out) throws Exception {
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byte[] buffer = new byte[oldBytes.length];
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while (is.available() > 0) {
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int i = 0xff & is.read();
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if (i != oldBytes[0]) {
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out.write(i);
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continue;
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}
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int pos = 0;
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while (pos < oldBytes.length && oldBytes[pos] == (byte) i) {
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buffer[pos] = (byte) i;
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pos++;
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i = is.read();
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}
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// We have read as much as matches oldBytes, plus one byte (now in i).
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// Write out:
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// buffer it if did not match fully
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// new bytes if it was a full match
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if (pos > 0) {
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if (pos == oldBytes.length) {
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System.out.println("copyWithSubstitution: replacing: ");
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printBytesOn(System.out, buffer);
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System.out.println("copyWithSubstitution: with:");
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printBytesOn(System.out, newBytes);
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out.write(newBytes, 0, newBytes.length);
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} else {
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out.write(buffer, 0, pos);
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}
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}
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// Does not handle two sequential occurrences of oldBytes.
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out.write(i);
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}
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out.close();
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}
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public static void printBytesOn(PrintStream out, byte[] bytes) {
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int numColumns = 16;
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int column = 0;
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for (int i = 0; i < bytes.length; i++) {
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if (column == 0) {
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out.print(i);
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out.print("\t");
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}
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out.print("0x" + Integer.toHexString(255 & bytes[i])
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/* + " (" + (char) bytes[i] + */ + "\t");
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column++;
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if (column == numColumns) {
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out.println();
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column = 0;
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}
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}
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out.println();
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}
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}
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}
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