InterfacePrivateCalls.java

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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
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 *
 * 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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package org.openjdk.bench.vm.compiler;

import org.openjdk.jmh.annotations.Benchmark;
import org.openjdk.jmh.annotations.BenchmarkMode;
import org.openjdk.jmh.annotations.Fork;
import org.openjdk.jmh.annotations.Level;
import org.openjdk.jmh.annotations.Measurement;
import org.openjdk.jmh.annotations.Mode;
import org.openjdk.jmh.annotations.OutputTimeUnit;
import org.openjdk.jmh.annotations.Scope;
import org.openjdk.jmh.annotations.Setup;
import org.openjdk.jmh.annotations.State;

import java.util.concurrent.TimeUnit;

@State(Scope.Benchmark)
public class InterfacePrivateCalls {
    interface I {
        private int bar() { return 0; }
        default int foo() {
            return bar();
        }
    }

    static class C1 implements I {}
    static class C2 implements I {}
    static class C3 implements I {}

    private I[] objs;

    @Setup(Level.Trial)
    public void setupTrial() {
        objs = new I[3];
        objs[0] = new C1();
        objs[1] = new C2();
        objs[2] = new C3();
    }

    @Benchmark
    @BenchmarkMode(Mode.AverageTime)
    @OutputTimeUnit(TimeUnit.NANOSECONDS)
    @Fork(value=1, jvmArgsAppend={"-XX:TieredStopAtLevel=1"})
    public void invokePrivateInterfaceMethodC1() {
        for (int i = 0; i < objs.length; ++i) {
            objs[i].foo();
        }
    }

    @Benchmark
    @BenchmarkMode(Mode.AverageTime)
    @OutputTimeUnit(TimeUnit.NANOSECONDS)
    @Fork(value=1)
    public void invokePrivateInterfaceMethodC2() {
        for (int i = 0; i < objs.length; ++i) {
            objs[i].foo();
        }
    }
}