135 lines
3.8 KiB
Java
135 lines
3.8 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;
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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.nio.file.Paths;
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import java.security.ProtectionDomain;
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class A {
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void m() {
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}
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}
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class B extends A {
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void m() {
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}
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}
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class C extends A {
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void m() {
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}
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}
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class Test {
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static public void m() throws Exception {
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for (int i = 0; i < 20000; i++) {
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m1(a);
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}
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for (int i = 0; i < 4; i++) {
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m1(b);
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}
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}
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static boolean m1(A a) {
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boolean res = Agent.m2(a);
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return res;
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}
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static public A a = new A();
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static public B b = new B();
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static public C c = new C();
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}
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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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static public boolean m2(A a) {
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boolean res = false;
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if (a.getClass() == B.class) {
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a.m();
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} else {
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res = true;
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}
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return res;
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}
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static public void main(String[] args) throws Exception {
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// Create speculative trap entries
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Test.m();
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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
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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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Test.m();
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// GC will hit dead method pointer
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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);
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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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