/*

 * Copyright (c) 2018, Red Hat, Inc. 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 8212673

 * @summary Node::eqv_uncast() shouldn't step over load barriers unconditionally

 * @library /test/lib /

 * @modules java.base/jdk.internal.misc

 *

 * @build sun.hotspot.WhiteBox

 * @run driver ClassFileInstaller sun.hotspot.WhiteBox

 *                                sun.hotspot.WhiteBox$WhiteBoxPermission

 * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -XX:-UseOnStackReplacement -XX:-TieredCompilation -XX:-BackgroundCompilation EqvUncastStepOverBarrier

 */

import sun.hotspot.WhiteBox;

import java.lang.reflect.Method;

public class EqvUncastStepOverBarrier {

    static final WhiteBox WHITE_BOX = WhiteBox.getWhiteBox();

    private static Object field = new A();

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

        for (int i = 0; i < 20_000; i++) {

            test();

            test();

            test_helper(null, 0);

        }

        Method m = EqvUncastStepOverBarrier.class.getDeclaredMethod("test");

        WHITE_BOX.enqueueMethodForCompilation(m, 4);

        if (!WHITE_BOX.isMethodCompiled(m, false)) {

            throw new RuntimeException("Method compilation failed");

        }

    }

    private static Object test() {

        Object o = field;

        if (o == null) {}

        for (int i = 1; i < 100; i *= 2) {

            int j = 0;

            for (; j < 4; j++) ;

            o = test_helper(o, j);

        }

        return o;

    }

    private static Object test_helper(Object o, int j) {

        if (j == 4) {

            A a = (A) o;

            o = a;

        } else {

            o = new Object();

        }

        return o;

    }

    private static class A {

    }

}