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 * 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.

 *

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/*

 * @test DeoptimizeMultipleOSRTest

 * @bug 8061817

 * @summary testing of WB::deoptimizeMethod()

 * @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:CompileCommand=compileonly,compiler.whitebox.DeoptimizeMultipleOSRTest::triggerOSR

 *                   compiler.whitebox.DeoptimizeMultipleOSRTest

 */

package compiler.whitebox;

import sun.hotspot.WhiteBox;

import java.lang.reflect.Method;

public class DeoptimizeMultipleOSRTest {

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

    private static final long BACKEDGE_THRESHOLD = 150000;

    private Method method;

    private int counter = 0;

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

        DeoptimizeMultipleOSRTest test = new DeoptimizeMultipleOSRTest();

        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 = DeoptimizeMultipleOSRTest.class.getDeclaredMethod("triggerOSR", boolean.class, long.class);

        // Trigger two OSR compiled versions

        triggerOSR(true, BACKEDGE_THRESHOLD);

        triggerOSR(false, BACKEDGE_THRESHOLD);

        // Wait for compilation

        CompilerWhiteBoxTest.waitBackgroundCompilation(method);

        // Deoptimize

        WHITE_BOX.deoptimizeMethod(method, true);

        if (WHITE_BOX.isMethodCompiled(method, true)) {

            throw new AssertionError("Not all OSR compiled versions were deoptimized");

        }

    }

    /**

     * Triggers OSR compilations by executing loops.

     *

     * @param first Determines which loop to execute

     * @param limit The number of loop iterations

     */

    public void triggerOSR(boolean first, long limit) {

        if (limit != 1) {

            // Warmup method to avoid uncommon traps

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

                triggerOSR(first, 1);

            }

            CompilerWhiteBoxTest.waitBackgroundCompilation(method);

        }

        if (first) {

            // Trigger OSR compilation 1

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

                counter++;

            }

        } else {

            // Trigger OSR compilation 2

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

                counter++;

            }

        }

    }

}