jdk8-mips64-public/hotspot: test/compiler/jsr292/RedefineMethodUsedByMultipleMethodHandles.java@a51071796915 (annotated)

test/compiler/jsr292/RedefineMethodUsedByMultipleMethodHandles.java@a51071796915 (annotated)

test/compiler/jsr292/RedefineMethodUsedByMultipleMethodHandles.java

Wed, 21 Jan 2015 12:38:11 +0100

author: goetz
date: Wed, 21 Jan 2015 12:38:11 +0100
changeset 7574: a51071796915
parent 7391: fe34c5ab0b35
child 9629: 8119983116f6
permissions: -rw-r--r--

8068013: [TESTBUG] Aix support in hotspot jtreg tests
Reviewed-by: ctornqvi, fzhinkin, farvidsson

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

Mercurial > jdk8-mips64-public > hotspot / annotate

test/compiler/jsr292/RedefineMethodUsedByMultipleMethodHandles.java@a51071796915 (annotated)

test/compiler/jsr292/RedefineMethodUsedByMultipleMethodHandles.java