Mercurial > hg > graal-jvmci-8
view jvmci/jdk.vm.ci.runtime.test/src/jdk/vm/ci/runtime/test/RedefineClassTest.java @ 22729:e00426c54952
made JVMCI providers available as a normal services to avoid need for recompiling Graal jars to deploy them on JDK9
author | Doug Simon <doug.simon@oracle.com> |
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date | Tue, 10 Nov 2015 23:16:06 +0100 |
parents | 1bbd4a7c274b |
children |
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/* * Copyright (c) 2011, 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. */ package jdk.vm.ci.runtime.test; import static org.junit.Assume.assumeTrue; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.lang.instrument.ClassFileTransformer; import java.lang.instrument.IllegalClassFormatException; import java.lang.instrument.Instrumentation; import java.lang.management.ManagementFactory; import java.lang.reflect.Method; import java.nio.file.Files; import java.nio.file.Path; import java.security.ProtectionDomain; import java.util.Arrays; import java.util.jar.Attributes; import java.util.jar.JarEntry; import java.util.jar.JarOutputStream; import java.util.jar.Manifest; import javax.tools.ToolProvider; import jdk.vm.ci.meta.ResolvedJavaMethod; import org.junit.Assert; import org.junit.Test; /** * Tests that {@link ResolvedJavaMethod}s are safe in the context of class redefinition being used * to redefine the method to which they refer. */ public class RedefineClassTest extends TypeUniverse { static class Foo { public static Object getName() { return "foo"; } } @Test public void test() throws Throwable { Method fooMethod = Foo.class.getDeclaredMethod("getName"); ResolvedJavaMethod foo1 = metaAccess.lookupJavaMethod(fooMethod); ResolvedJavaMethod foo2 = metaAccess.lookupJavaMethod(fooMethod); String foo1Code = Arrays.toString(foo1.getCode()); String foo2Code = Arrays.toString(foo2.getCode()); Assert.assertEquals("foo", Foo.getName()); redefineFoo(); System.gc(); // Make sure the transformation happened Assert.assertEquals("bar", Foo.getName()); Assert.assertEquals(foo1Code, Arrays.toString(foo1.getCode())); Assert.assertEquals(foo2Code, Arrays.toString(foo1.getCode())); } /** * Adds the class file bytes for a given class to a JAR stream. */ static void add(JarOutputStream jar, Class<?> c) throws IOException { String name = c.getName(); String classAsPath = name.replace('.', '/') + ".class"; jar.putNextEntry(new JarEntry(classAsPath)); InputStream stream = c.getClassLoader().getResourceAsStream(classAsPath); int nRead; byte[] buf = new byte[1024]; while ((nRead = stream.read(buf, 0, buf.length)) != -1) { jar.write(buf, 0, nRead); } jar.closeEntry(); } protected 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(); loadAgent(jar); } finally { Files.deleteIfExists(jar); } } public static void loadAgent(Path agent) throws Exception { String vmName = ManagementFactory.getRuntimeMXBean().getName(); int p = vmName.indexOf('@'); assumeTrue("VM name not in <pid>@<host> format: " + vmName, p != -1); 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, 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 { if (inst.isRedefineClassesSupported() && inst.isRetransformClassesSupported()) { inst.addTransformer(new FooTransformer(), true); Class<?>[] allClasses = inst.getAllLoadedClasses(); for (int i = 0; i < allClasses.length; i++) { Class<?> c = allClasses[i]; if (c == Foo.class) { inst.retransformClasses(new Class<?>[]{c}); } } } } } /** * This transformer replaces the first instance of the constant "foo" in the class file for * {@link Foo} with "bar". */ 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)) { String cf = new String(classfileBuffer); int i = cf.indexOf("foo"); Assert.assertTrue("cannot find \"foo\" constant in " + Foo.class.getSimpleName() + "'s class file", i > 0); classfileBuffer[i] = 'b'; classfileBuffer[i + 1] = 'a'; classfileBuffer[i + 2] = 'r'; } return classfileBuffer; } } }