1 /*
   2  * Copyright (c) 2012, 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  * @compile -XDignore.symbol.file Victim.java
  30  * @run main/othervm -Xverify:all -Xint Test8003720
  31  */
  32 
  33 // Attempts to make the JVM unload a class while still executing one of its methods.
  34 public class Test8003720 {
  35     final static String VICTIM_CLASS_NAME = "Victim";
  36     final static boolean QUIET = true;
  37     final static long DURATION = 30000;
  38 
  39     public interface CallMe { void callme(); }
  40 
  41     public static void main(String... av) throws Throwable {
  42         newVictimClassLoader();
  43         System.gc();
  44 
  45         newVictimClass();
  46         System.gc();
  47 
  48         newVictimInstance();
  49         System.gc();
  50 
  51         ((CallMe)newVictimInstance()).callme();
  52     }
  53 
  54     public static Object newVictimInstance() throws Throwable {
  55         return newVictimClass().newInstance();
  56     }
  57 
  58     public static Class<?> newVictimClass() throws Throwable {
  59         return Class.forName(VICTIM_CLASS_NAME, true, new VictimClassLoader());
  60     }
  61 
  62     public static ClassLoader newVictimClassLoader() throws Throwable {
  63         return new VictimClassLoader();
  64     }
  65 
  66     public static void println(String line) {
  67         if (!QUIET) {
  68             System.out.println(line);
  69         }
  70     }
  71 }