1 /*

     2  * Copyright (c) 2012, 2015, 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 /*

    26  * @test

    27  * @bug 8003720

    28  * @summary Method in interpreter stack frame can be deallocated

    29  * @modules java.base/jdk.internal.org.objectweb.asm

    30  *          java.base/jdk.internal.misc

    31  * @compile -XDignore.symbol.file Victim.java

    32  * @run main/othervm -Xverify:all -Xint Test8003720

    33  */

    34 

    35 // Attempts to make the JVM unload a class while still executing one of its methods.

    36 public class Test8003720 {

    37     final static String VICTIM_CLASS_NAME = "Victim";

    38     final static boolean QUIET = true;

    39     final static long DURATION = 30000;

    40 

    41     public interface CallMe { void callme(); }

    42 

    43     public static void main(String... av) throws Throwable {

    44         newVictimClassLoader();

    45         System.gc();

    46 

    47         newVictimClass();

    48         System.gc();

    49 

    50         newVictimInstance();

    51         System.gc();

    52 

    53         ((CallMe)newVictimInstance()).callme();

    54     }

    55 

    56     public static Object newVictimInstance() throws Throwable {

    57         return newVictimClass().newInstance();

    58     }

    59 

    60     public static Class<?> newVictimClass() throws Throwable {

    61         return Class.forName(VICTIM_CLASS_NAME, true, new VictimClassLoader());

    62     }

    63 

    64     public static ClassLoader newVictimClassLoader() throws Throwable {

    65         return new VictimClassLoader();

    66     }

    67 

    68     public static void println(String line) {

    69         if (!QUIET) {

    70             System.out.println(line);

    71         }

    72     }

    73 }