| /* |
| * Copyright (c) 2016, 2018, 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 8165246 8010319 |
| * @summary Test has_previous_versions flag and processing during class unloading. |
| * @requires vm.opt.final.ClassUnloading |
| * @library /test/lib |
| * @modules java.base/jdk.internal.misc |
| * @modules java.compiler |
| * java.instrument |
| * jdk.jartool/sun.tools.jar |
| * @run main RedefineClassHelper |
| * @run main/othervm RedefinePreviousVersions test |
| */ |
| |
| import jdk.test.lib.process.ProcessTools; |
| import jdk.test.lib.process.OutputAnalyzer; |
| |
| // package access top-level classes to avoid problem with RedefineClassHelper |
| // and nested types. |
| |
| class RedefinePreviousVersions_B { } |
| |
| class RedefinePreviousVersions_Running { |
| public static volatile boolean stop = false; |
| public static volatile boolean running = false; |
| static void localSleep() { |
| try { |
| Thread.sleep(10); // sleep for 10 ms |
| } catch(InterruptedException ie) { |
| } |
| } |
| |
| public static void infinite() { |
| running = true; |
| while (!stop) { localSleep(); } |
| } |
| } |
| |
| |
| |
| public class RedefinePreviousVersions { |
| |
| public static String newB = |
| "class RedefinePreviousVersions_B {" + |
| "}"; |
| |
| public static String newRunning = |
| "class RedefinePreviousVersions_Running {" + |
| " public static volatile boolean stop = true;" + |
| " public static volatile boolean running = true;" + |
| " static void localSleep() { }" + |
| " public static void infinite() { }" + |
| "}"; |
| |
| public static void main(String[] args) throws Exception { |
| |
| if (args.length > 0) { |
| |
| // java -javaagent:redefineagent.jar -Xlog:stuff RedefinePreviousVersions |
| ProcessBuilder pb = ProcessTools.createJavaProcessBuilder( "-javaagent:redefineagent.jar", |
| "-Xlog:redefine+class+iklass+add=trace,redefine+class+iklass+purge=trace", |
| "RedefinePreviousVersions"); |
| new OutputAnalyzer(pb.start()) |
| .shouldContain("Class unloading: has_previous_versions = false") |
| .shouldContain("Class unloading: has_previous_versions = true") |
| .shouldHaveExitValue(0); |
| return; |
| } |
| |
| // Redefine a class and create some garbage |
| // Since there are no methods running, the previous version is never added to the |
| // previous_version_list and the flag _has_previous_versions should stay false |
| RedefineClassHelper.redefineClass(RedefinePreviousVersions_B.class, newB); |
| |
| for (int i = 0; i < 10 ; i++) { |
| String s = new String("some garbage"); |
| System.gc(); |
| } |
| |
| // Start a class that has a method running |
| new Thread() { |
| public void run() { |
| RedefinePreviousVersions_Running.infinite(); |
| } |
| }.start(); |
| |
| while (!RedefinePreviousVersions_Running.running) { |
| Thread.sleep(10); // sleep for 10 ms |
| } |
| |
| // Since a method of newRunning is running, this class should be added to the previous_version_list |
| // of Running, and _has_previous_versions should return true at class unloading. |
| RedefineClassHelper.redefineClass(RedefinePreviousVersions_Running.class, newRunning); |
| |
| for (int i = 0; i < 10 ; i++) { |
| String s = new String("some garbage"); |
| System.gc(); |
| } |
| |
| // purge should clean everything up, except Xcomp it might not. |
| RedefinePreviousVersions_Running.stop = true; |
| |
| for (int i = 0; i < 10 ; i++) { |
| String s = new String("some garbage"); |
| System.gc(); |
| } |
| } |
| } |