/*

 * Copyright (c) 2019, 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

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 */

/*

 * @test OSRFailureLevel4Test

 * @summary check that not compilable OSR level 4 results in falling back to level 1

 * @library /test/lib /

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

 *          java.management

 * @build sun.hotspot.WhiteBox

 * @run driver ClassFileInstaller sun.hotspot.WhiteBox

 *                                sun.hotspot.WhiteBox$WhiteBoxPermission

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

 *                   -XX:+WhiteBoxAPI -XX:+TieredCompilation compiler.whitebox.OSRFailureLevel4Test

 */

package compiler.whitebox;

import sun.hotspot.WhiteBox;

import java.lang.reflect.Executable;

import java.lang.reflect.Method;

public class OSRFailureLevel4Test extends Thread {

    private static final WhiteBox WHITE_BOX = WhiteBox.getWhiteBox();

    private static final long BACKEDGE_THRESHOLD = 150000;

    private Method method;

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

        OSRFailureLevel4Test test = new OSRFailureLevel4Test();

        test.test();

    }

    /**

     * Triggers two different OSR compilations for the same method and

     * checks if WhiteBox.deoptimizeMethod() deoptimizes both.

     *

     * @throws Exception

     */

    public void test() throws Exception {

        method = OSRFailureLevel4Test.class.getDeclaredMethod("run");

        WHITE_BOX.makeMethodNotCompilable(method, 4, true);

        Thread t = new OSRFailureLevel4Test();

        t.setDaemon(true);

        t.start();

        int currentLevel = 0;

        int loops = 0;

        while (true) {

            int level = WHITE_BOX.getMethodCompilationLevel(method, true);

            if (level == 1) {

                System.err.println("success");

                running = false;

                return;

            }

            if (level == currentLevel) {

                Thread.sleep(1000);

                loops++;

                if (loops > 100) {

                    running = false;

                    throw new AssertionError("Never reached level 1");

                }

                continue;

            }

            currentLevel = level;

            System.err.println("Current level = " + currentLevel);

        }

    }

    static volatile int counter = 0;

    static boolean running = true;

    public void run() {

        while (running) {

            counter++;

        }

    }

}