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Graal.js JMH Interop Suite
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 *
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 * person obtaining a copy of this software, associated documentation and/or
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 * the Larger Works (as defined below), to deal in both
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 * (a) the Software, and
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 * (b) any piece of software and/or hardware listed in the lrgrwrks.txt file if
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package com.oracle.truffle.js.jmh;

import org.graalvm.polyglot.Context;
import org.graalvm.polyglot.Source;
import org.graalvm.polyglot.Value;
import org.openjdk.jmh.annotations.Benchmark;
import org.openjdk.jmh.annotations.Fork;
import org.openjdk.jmh.annotations.Level;
import org.openjdk.jmh.annotations.Measurement;
import org.openjdk.jmh.annotations.Scope;
import org.openjdk.jmh.annotations.Setup;
import org.openjdk.jmh.annotations.State;
import org.openjdk.jmh.annotations.TearDown;
import org.openjdk.jmh.annotations.Warmup;
import org.openjdk.jmh.infra.Blackhole;

@Warmup(iterations = 5)
@Measurement(iterations = 5)
@Fork(2)
public class JMHArrayInteropBenchmark {
    @State(Scope.Thread)
    public static class MyState {
        protected static final int ARRAY_SIZE = 10000;

        Context context;
        Source preSizedArraySource;
        Value preallocatedArray;
        Value preallocatedTypedArray;

        @Setup(Level.Trial)
        public void doSetup() {
            context = Context.create("js");
            preSizedArraySource = Source.create("js", "new Array(" + ARRAY_SIZE + ")");
            preallocatedArray = context.eval(Source.create("js", "new Array(" + ARRAY_SIZE + ").fill(0)"));
            preallocatedTypedArray = context.eval(Source.create("js", "new Int32Array(" + ARRAY_SIZE + ")"));
        }

        @TearDown(Level.Trial)
        public void doTearDown() {
            context.close();
        }
    }

    @Benchmark
    public Value testPopulateJSArrayFromJava(MyState state) {
        Value array = state.context.eval(state.preSizedArraySource);
        for (int i = 0; i < MyState.ARRAY_SIZE; i++) {
            array.setArrayElement(i, i);
        }
        return array;
    }

    @Benchmark
    public Value testWriteJSArrayFromJava(MyState state) {
        Value array = state.preallocatedArray;
        for (int i = 0; i < MyState.ARRAY_SIZE; i++) {
            array.setArrayElement(i, i);
        }
        return array;
    }

    @Benchmark
    public Value testReadJSArrayFromJava(MyState state, Blackhole blackhole) {
        Value array = state.preallocatedArray;
        for (int i = 0; i < MyState.ARRAY_SIZE; i++) {
            blackhole.consume(array.getArrayElement(i));
        }
        return array;
    }

    @Benchmark
    public Value testWriteJSTypedArrayFromJava(MyState state) {
        Value array = state.preallocatedTypedArray;
        for (int i = 0; i < MyState.ARRAY_SIZE; i++) {
            array.setArrayElement(i, i);
        }
        return array;
    }

    @Benchmark
    public Value testReadJSTypedArrayFromJava(MyState state, Blackhole blackhole) {
        Value array = state.preallocatedTypedArray;
        for (int i = 0; i < MyState.ARRAY_SIZE; i++) {
            blackhole.consume(array.getArrayElement(i));
        }
        return array;
    }
}