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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * 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).
 *
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 * 2 along with this work; if not, write to the Free Software Foundation,
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package org.openjdk.bench.java.lang.foreign;

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.Setup;
import org.openjdk.jmh.annotations.State;
import org.openjdk.jmh.annotations.TearDown;
import org.openjdk.jmh.annotations.Warmup;

import java.lang.foreign.Arena;
import java.lang.foreign.FunctionDescriptor;
import java.lang.foreign.Linker;
import java.lang.foreign.MemorySegment;
import java.lang.foreign.MemorySegment.Scope;
import java.lang.foreign.SegmentAllocator;
import java.lang.invoke.MethodHandle;
import java.util.concurrent.TimeUnit;

import static java.lang.foreign.ValueLayout.JAVA_BYTE;

@BenchmarkMode(Mode.AverageTime)
@Warmup(iterations = 5, time = 500, timeUnit = TimeUnit.MILLISECONDS)
@Measurement(iterations = 10, time = 500, timeUnit = TimeUnit.MILLISECONDS)
@State(org.openjdk.jmh.annotations.Scope.Thread)
@OutputTimeUnit(TimeUnit.NANOSECONDS)
@Fork(value = 3, jvmArgs = { "--enable-native-access=ALL-UNNAMED", "-Djava.library.path=micro/native" })
public class ToCStringTest extends CLayouts {

    @Param({"5", "20", "100", "200", "451"})
    public int size;
    public String str;

    static {
        System.loadLibrary("ToCString");
    }

    static final MethodHandle STRLEN;

    static {
        Linker abi = Linker.nativeLinker();
        STRLEN = abi.downcallHandle(abi.defaultLookup().findOrThrow("strlen"),
                FunctionDescriptor.of(C_INT, C_POINTER));
    }

    @Setup
    public void setup() {
        str = makeString(size);
    }

    @Benchmark
    public long jni_writeString() throws Throwable {
        return writeString(str);
    }

    @Benchmark
    public MemorySegment panama_writeString() throws Throwable {
        try (Arena arena = Arena.ofConfined()) {
            return arena.allocateFrom(str);
        }
    }

    static native long writeString(String str);

    static String makeString(int size) {
        String lorem = """
                Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et
                 dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip
                 ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu
                 fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt
                 mollit anim id est laborum.
                """;
        while (lorem.length() < size) {
            lorem += lorem;
        }
        return lorem.substring(0, size);
    }
}