/*

 * 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.

 */

package org.openjdk.bench.vm.lang;

import org.openjdk.jmh.annotations.Benchmark;

import org.openjdk.jmh.annotations.BenchmarkMode;

import org.openjdk.jmh.annotations.Mode;

import org.openjdk.jmh.annotations.OutputTimeUnit;

import org.openjdk.jmh.annotations.Scope;

import org.openjdk.jmh.annotations.State;

import org.openjdk.jmh.infra.Blackhole;

import java.util.concurrent.TimeUnit;

/**

 * Tests throwing exceptions.

 */

@BenchmarkMode(Mode.AverageTime)

@OutputTimeUnit(TimeUnit.NANOSECONDS)

@State(Scope.Thread)

public class Throw {

    public static boolean alwaysTrue = true;

    private static Object nullObject = null;

    public Object useObject = new Object();

    @Benchmark

    public void throwSyncException(Blackhole bh) {

        try {

            throwingMethod();

        } catch (Exception ex) {

            bh.consume(useObject);

        }

    }

    @Benchmark

    public void throwASyncException(Blackhole bh) {

        try {

            throwNullpointer();

        } catch (Exception ex) {

            bh.consume(useObject);

        }

    }

    @Benchmark

    public void throwSyncExceptionUseException(Blackhole bh) {

        try {

            throwingMethod();

        } catch (Exception ex) {

            bh.consume(ex);

        }

    }

    @Benchmark

    public void throwSyncExceptionUseMessage(Blackhole bh) {

        try {

            throwingMethod();

        } catch (Exception ex) {

            bh.consume(ex.getMessage());

        }

    }

    @Benchmark

    public void throwSyncExceptionUseStacktrace(Blackhole bh) {

        try {

            throwingMethod();

        } catch (Exception ex) {

            bh.consume(ex.getStackTrace());

        }

    }

    @Benchmark

    public void throwWith16Frames(Blackhole bh) {

        try {

            throwingMethod(16);

        } catch (Exception ex) {

            bh.consume(useObject);

        }

    }

    @Benchmark

    public void throwWith32Frames(Blackhole bh) {

        try {

            throwingMethod(32);

        } catch (Exception ex) {

            bh.consume(useObject);

        }

    }

    @Benchmark

    public void throwWith64Frames(Blackhole bh) {

        try {

            throwingMethod(64);

        } catch (Exception ex) {

            bh.consume(useObject);

        }

    }

    public void throwingMethod() throws Exception {

        if (alwaysTrue) {

            throw new Exception();

        }

    }

    public void throwingMethod(int i) throws Exception {

        if (i == 0) {

            throw new Exception();

        }

        throwingMethod(i - 1);

    }

    public void throwNullpointer() {

        nullObject.hashCode();

    }

}