1 /*

     2  * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

    19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    20  * or visit www.oracle.com if you need additional information or have any

    21  * questions.

    22  */

    23 

    24 /*

    25  * @test

    26  * @bug 8165246

    27  * @summary Test has_previous_versions flag and processing during class unloading.

    28  * @library /test/lib

    29  * @modules java.base/jdk.internal.misc

    30  * @modules java.compiler

    31  *          java.instrument

    32  *          jdk.jartool/sun.tools.jar

    33  * @run main RedefineClassHelper

    34  * @run main/othervm RedefinePreviousVersions test

    35  */

    36 

    37 import jdk.test.lib.process.ProcessTools;

    38 import jdk.test.lib.process.OutputAnalyzer;

    39 

    40 public class RedefinePreviousVersions {

    41 

    42     public static String newB =

    43                 "class RedefinePreviousVersions$B {" +

    44                 "}";

    45 

    46     static class B { }

    47 

    48     public static String newRunning =

    49         "class RedefinePreviousVersions$Running {" +

    50         "    public static volatile boolean stop = true;" +

    51         "    static void localSleep() { }" +

    52         "    public static void infinite() { }" +

    53         "}";

    54 

    55     static class Running {

    56         public static volatile boolean stop = false;

    57         static void localSleep() {

    58           try{

    59             Thread.currentThread().sleep(10);//sleep for 10 ms

    60           } catch(InterruptedException ie) {

    61           }

    62         }

    63 

    64         public static void infinite() {

    65             while (!stop) { localSleep(); }

    66         }

    67     }

    68 

    69     public static void main(String[] args) throws Exception {

    70 

    71         if (args.length > 0) {

    72 

    73             String jarFile = System.getProperty("test.src") + "/testcase.jar";

    74 

    75             // java -javaagent:redefineagent.jar -Xlog:stuff RedefinePreviousVersions

    76             ProcessBuilder pb = ProcessTools.createJavaProcessBuilder( "-javaagent:redefineagent.jar",

    77                "-Xlog:redefine+class+iklass+add=trace,redefine+class+iklass+purge=trace",

    78                "RedefinePreviousVersions");

    79             new OutputAnalyzer(pb.start())

    80               .shouldContain("Class unloading: has_previous_versions = false")

    81               .shouldContain("Class unloading: has_previous_versions = true")

    82               .shouldHaveExitValue(0);

    83             return;

    84         }

    85 

    86         // Redefine a class and create some garbage

    87         // Since there are no methods running, the previous version is never added to the

    88         // previous_version_list and the flag _has_previous_versions should stay false

    89         RedefineClassHelper.redefineClass(B.class, newB);

    90 

    91         for (int i = 0; i < 10 ; i++) {

    92             String s = new String("some garbage");

    93             System.gc();

    94         }

    95 

    96         // Start a class that has a method running

    97         new Thread() {

    98             public void run() {

    99                 Running.infinite();

   100             }

   101         }.start();

   102 

   103         // Since a method of newRunning is running, this class should be added to the previous_version_list

   104         // of Running, and _has_previous_versions should return true at class unloading.

   105         RedefineClassHelper.redefineClass(Running.class, newRunning);

   106 

   107         for (int i = 0; i < 10 ; i++) {

   108             String s = new String("some garbage");

   109             System.gc();

   110         }

   111 

   112         // purge should clean everything up, except Xcomp it might not.

   113         Running.stop = true;

   114 

   115         for (int i = 0; i < 10 ; i++) {

   116             String s = new String("some garbage");

   117             System.gc();

   118         }

   119     }

   120 }