120 lines
4.4 KiB
Java
120 lines
4.4 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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package compiler.profiling.spectrapredefineclass_classloaders;
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import com.sun.tools.attach.VirtualMachine;
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import jdk.test.lib.Utils;
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import java.lang.instrument.ClassFileTransformer;
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import java.lang.instrument.Instrumentation;
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import java.lang.reflect.Method;
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import java.net.MalformedURLException;
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import java.net.URL;
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import java.net.URLClassLoader;
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import java.nio.file.Path;
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import java.nio.file.Paths;
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import java.security.ProtectionDomain;
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public class Agent implements ClassFileTransformer {
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public static final String AGENT_JAR = Paths.get(Utils.TEST_CLASSES, "agent.jar").toString();
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public static ClassLoader newClassLoader() {
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try {
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return new URLClassLoader(new URL[] {
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Paths.get(Utils.TEST_CLASSES).toUri().toURL(),
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}, null);
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} catch (MalformedURLException e){
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throw new RuntimeException("Unexpected URL conversion failure", e);
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}
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}
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static public Class Test_class;
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static public void main(String[] args) throws Exception {
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// loader2 must be first on the list so loader 1 must be used first
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ClassLoader loader1 = newClassLoader();
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String packageName = Agent.class.getPackage().getName();
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Class dummy = loader1.loadClass(packageName + ".Test");
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ClassLoader loader2 = newClassLoader();
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Test_class = loader2.loadClass(packageName + ".Test");
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Method m3 = Test_class.getMethod("m3", ClassLoader.class);
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// Add speculative trap in m2() (loaded by loader1) that
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// references m4() (loaded by loader2).
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m3.invoke(Test_class.newInstance(), loader1);
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String pid = Long.toString(ProcessHandle.current().pid());
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// Make the nmethod go away
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for (int i = 0; i < 10; i++) {
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System.gc();
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}
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// Redefine class Test loaded by loader2
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for (int i = 0; i < 2; i++) {
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try {
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VirtualMachine vm = VirtualMachine.attach(pid);
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vm.loadAgent(AGENT_JAR, "");
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vm.detach();
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} catch (Exception e) {
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throw new RuntimeException(e);
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}
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}
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// Will process loader2 first, find m4() is redefined and
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// needs to be freed then process loader1, check the
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// speculative trap in m2() and try to access m4() which was
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// freed already.
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for (int i = 0; i < 10; i++) {
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System.gc();
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}
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}
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public synchronized byte[] transform(final ClassLoader classLoader,
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final String className,
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Class<?> classBeingRedefined,
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ProtectionDomain protectionDomain,
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byte[] classfileBuffer) {
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System.out.println("Transforming class " + className + " "+ classLoader);
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return classfileBuffer;
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}
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public static void redefine(String agentArgs, Instrumentation instrumentation, Class to_redefine) {
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try {
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instrumentation.retransformClasses(to_redefine);
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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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public static void agentmain(String agentArgs, Instrumentation instrumentation) throws Exception {
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Agent transformer = new Agent();
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instrumentation.addTransformer(transformer, true);
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redefine(agentArgs, instrumentation, Test_class);
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}
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}
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