1 /*

     2  * Copyright (c) 2014, 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 8031752

    27  * @summary speculative traps need to be cleaned up at GC

    28  * @run main/othervm -XX:+IgnoreUnrecognizedVMOptions -XX:-TieredCompilation -XX:-UseOnStackReplacement -XX:-BackgroundCompilation -XX:+UseTypeSpeculation -XX:TypeProfileLevel=222 -XX:CompileCommand=exclude,java.lang.reflect.Method::invoke -XX:CompileCommand=exclude,sun.reflect.DelegatingMethodAccessorImpl::invoke -Xmx512M TestSpecTrapClassUnloading

    29  *

    30  */

    31 

    32 import java.lang.reflect.Method;

    33 

    34 public class TestSpecTrapClassUnloading {

    35     static class B {

    36         final public boolean m(Object o) {

    37             if (o.getClass() == B.class) {

    38                 return true;

    39             }

    40             return false;

    41         }

    42     }

    43 

    44     static class MemoryChunk {

    45         MemoryChunk other;

    46         long[] array;

    47         MemoryChunk(MemoryChunk other) {

    48             this.other = other;

    49             array = new long[1024 * 1024 * 1024];

    50         }

    51     }

    52 

    53     static void m1(B b, Object o) {

    54         b.m(o);

    55     }

    56 

    57     static void m2(B b, Object o) {

    58         b.m(o);

    59     }

    60 

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

    62         Method m = B.class.getMethod("m", Object.class);

    63         Object o = new Object();

    64         B b = new B();

    65 

    66         // add speculative trap in B.m() for m1

    67         for (int i = 0; i < 20000; i++) {

    68             m1(b, b);

    69         }

    70         m1(b, o);

    71 

    72         // add speculative trap in B.m() for code generated by reflection

    73         for (int i = 0; i < 20000; i++) {

    74             m.invoke(b, b);

    75         }

    76         m.invoke(b, o);

    77 

    78         m = null;

    79 

    80         // add speculative trap in B.m() for m2

    81         for (int i = 0; i < 20000; i++) {

    82             m2(b, b);

    83         }

    84         m2(b, o);

    85 

    86         // Exhaust memory which causes the code generated by

    87         // reflection to be unloaded but B.m() is not.

    88         MemoryChunk root = null;

    89         try {

    90             while (true) {

    91                 root = new MemoryChunk(root);

    92             }

    93         } catch(OutOfMemoryError e) {

    94             root = null;

    95         }

    96     }

    97 }