/*

 * Copyright (c) 2014, 2015, 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

 * @key gc

 * @bug 8049831

 * @library /testlibrary /test/lib

 * @modules java.base/sun.misc

 *          java.management

 * @build TestCapacityUntilGCWrapAround

 * @run main ClassFileInstaller sun.hotspot.WhiteBox

 *                              sun.hotspot.WhiteBox$WhiteBoxPermission

 * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI TestCapacityUntilGCWrapAround

 */

import sun.hotspot.WhiteBox;

import jdk.test.lib.Asserts;

import jdk.test.lib.Platform;

public class TestCapacityUntilGCWrapAround {

    private static long MB = 1024 * 1024;

    private static long GB = 1024 * MB;

    private static long MAX_UINT = 4 * GB - 1; // On 32-bit platforms

    public static void main(String[] args) {

        if (Platform.is32bit()) {

            WhiteBox wb = WhiteBox.getWhiteBox();

            long before = wb.metaspaceCapacityUntilGC();

            // Now force possible overflow of capacity_until_GC.

            long after = wb.incMetaspaceCapacityUntilGC(MAX_UINT);

            Asserts.assertGTE(after, before,

                              "Increasing with MAX_UINT should not cause wrap around: " + after + " < " + before);

            Asserts.assertLTE(after, MAX_UINT,

                              "Increasing with MAX_UINT should not cause value larger than MAX_UINT:" + after);

        }

    }

}