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package org.openjdk.bench.java.lang.foreign;

import jdk.internal.foreign.BufferStack;
import org.openjdk.jmh.annotations.Benchmark;
import org.openjdk.jmh.annotations.BenchmarkMode;
import org.openjdk.jmh.annotations.Fork;
import org.openjdk.jmh.annotations.Measurement;
import org.openjdk.jmh.annotations.Mode;
import org.openjdk.jmh.annotations.OutputTimeUnit;
import org.openjdk.jmh.annotations.Param;
import org.openjdk.jmh.annotations.Scope;
import org.openjdk.jmh.annotations.Setup;
import org.openjdk.jmh.annotations.State;
import org.openjdk.jmh.annotations.Warmup;

import java.lang.foreign.Arena;
import java.util.concurrent.TimeUnit;

@BenchmarkMode(Mode.AverageTime)
@Warmup(iterations = 5, time = 500, timeUnit = TimeUnit.MILLISECONDS)
@Measurement(iterations = 5, time = 500, timeUnit = TimeUnit.MILLISECONDS)
@State(Scope.Thread)
@OutputTimeUnit(TimeUnit.NANOSECONDS)
@Fork(value = 3, jvmArgs = {"--add-exports=java.base/jdk.internal.foreign=ALL-UNNAMED"})
public class BufferStackBench {

    @Param({"8", "16", "32"})
    public int ELEM_SIZE;

    private BufferStack bufferStack;

    @Setup
    public void setup() {
        bufferStack = BufferStack.of(128);
    }

    @Benchmark
    public long confined() {
        try (Arena arena = Arena.ofConfined()) {
            return arena.allocate(ELEM_SIZE).address();
        }
    }

    @Benchmark
    public long buffer() {
        try (Arena arena = bufferStack.pushFrame(64, 1)) {
            return arena.allocate(ELEM_SIZE).address();
        }
    }

    @Fork(value = 3, jvmArgsAppend = "-Djmh.executor=VIRTUAL")
    public static class OfVirtual extends BufferStackBench {}

}