LuauTest.java

import java.lang.foreign.*;
import java.nio.file.Path;

public class Main {

    public static void main(String[] args) throws Throwable {
        try (Arena arena = Arena.ofShared()) {
            SymbolLookup vmSymbols = SymbolLookup.libraryLookup(Path.of("libLuau.VM.dylib"), arena);
            SymbolLookup compilerSymbols = SymbolLookup.libraryLookup(Path.of("libLuau.Compiler.dylib"), arena);

            var luaL_newstate = Linker.nativeLinker().downcallHandle(
                    vmSymbols.find("luaL_newstate").orElseThrow(),
                    FunctionDescriptor.of(ValueLayout.ADDRESS)
            );
            var lua_close = Linker.nativeLinker().downcallHandle(
                    vmSymbols.find("lua_close").orElseThrow(),
                    FunctionDescriptor.ofVoid(ValueLayout.ADDRESS)
            );
            var luau_compile = Linker.nativeLinker().downcallHandle(
                    compilerSymbols.find("luau_compile").orElseThrow(),
                    FunctionDescriptor.of(ValueLayout.ADDRESS, ValueLayout.ADDRESS, ValueLayout.JAVA_LONG, ValueLayout.ADDRESS, ValueLayout.ADDRESS)
            );
            var luau_load = Linker.nativeLinker().downcallHandle(
                    vmSymbols.find("luau_load").orElseThrow(),
                    FunctionDescriptor.of(ValueLayout.JAVA_INT, ValueLayout.ADDRESS, ValueLayout.ADDRESS, ValueLayout.ADDRESS, ValueLayout.JAVA_LONG, ValueLayout.JAVA_INT)
            );
            var luaL_openlibs = Linker.nativeLinker().downcallHandle(
                    vmSymbols.find("luaL_openlibs").orElseThrow(),
                    FunctionDescriptor.ofVoid(ValueLayout.ADDRESS)
            );
            var lua_pcall = Linker.nativeLinker().downcallHandle(
                    vmSymbols.find("lua_pcall").orElseThrow(),
                    FunctionDescriptor.of(ValueLayout.JAVA_INT, ValueLayout.ADDRESS, ValueLayout.JAVA_INT, ValueLayout.JAVA_INT, ValueLayout.JAVA_INT)
            );

            MemorySegment L = (MemorySegment) luaL_newstate.invoke();
            System.out.println(L);

            luaL_openlibs.invokeExact(L);

            var source = "print('hello from lua')";
            var bytecodeSize = arena.allocate(ValueLayout.JAVA_LONG);

            var sourceCStr = arena.allocateUtf8String(source);
            var bytecode = (MemorySegment) luau_compile.invoke(sourceCStr, (long) source.length(), MemorySegment.NULL, bytecodeSize);

            long size = bytecodeSize.get(ValueLayout.JAVA_LONG, 0);
            System.out.println("size " + size);
            var namecstr = arena.allocateUtf8String("main.lua");
            var result = luau_load.invoke(L, namecstr, bytecode, size, 0);
            System.out.println("RESULT: " + result);
            //todo free bytecode

            lua_pcall.invoke(L, 0, 0, 0);
          
            lua_close.invoke(L);

        }

    }
}