/*

 * Copyright (c) 2014, 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 8031752

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

 *

 */

import java.lang.reflect.Method;

public class TestSpecTrapClassUnloading {

    static class B {

        final public boolean m(Object o) {

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

                return true;

            }

            return false;

        }

    }

    static class MemoryChunk {

        MemoryChunk other;

        long[] array;

        MemoryChunk(MemoryChunk other) {

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

        }

    }

    static void m1(B b, Object o) {

        b.m(o);

    }

    static void m2(B b, Object o) {

        b.m(o);

    }

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

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

        Object o = new Object();

        B b = new B();

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

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

            m1(b, b);

        }

        m1(b, o);

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

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

            m.invoke(b, b);

        }

        m.invoke(b, o);

        m = null;

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

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

            m2(b, b);

        }

        m2(b, o);

        // Exhaust memory which causes the code generated by

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

        MemoryChunk root = null;

        try {

            while (true) {

                root = new MemoryChunk(root);

            }

        } catch(OutOfMemoryError e) {

            root = null;

        }

    }

}