Re: FFI to conveniently export Lua functions as a DLL?

There is already luaL_dostring in lua.dll that allows to call lua code from 
C, but you would need to handle arguments and return values manually.
With some preprocessor magic / C++ templates, you could automatically 
generate code to call corresponding lua_pushXXX() functions to pass 
arguments to Lua function before lua_pcall, and then lua_toXXX to get 
result so it would look like a C function.

Also alien.callback could convert Lua function into C function pointer.

And there is another but primitive FFI for Lua 
https://github.com/pavel212/uffi (sysV a bit broken, but windows should be 
ok).
given Lua function could be placed in LUA_REGISTRYINDEX, and then function 
make_cb  
(https://github.com/pavel212/uffi/blob/11967d07e0fcb2ca8758b410dbae2702a812893e/src/win64.c#L112) 
would convert it into C function.
It would generate binary code, that could be called then as a C function 
pointer, and it would get/convert arguments according to provided 
signature, pass it to lua function, call lua function and return the result 
pretending it is just a C function.

суббота, 28 марта 2026 г. в 21:24:52 UTC+1, Björn Buckwalter: 

>  Hi all,
>
> The LuaJIT FFI library[1]  and Alien[2] make it very convenient to call 
> external (C) libraries, by providing C declarations from header files 
> verbatim. Is there similar tooling but for exporting Lua functions as a DLL 
> based?
>
> Thanks,
> Bjorn
>
> [1]: https://luajit.org/ext_ffi.html
> [2]: https://github.com/mascarenhas/alien
>

-- 
You received this message because you are subscribed to the Google Groups "lua-l" group.
To unsubscribe from this group and stop receiving emails from it, send an email to [email protected].
To view this discussion visit https://groups.google.com/d/msgid/lua-l/a6318ed2-989e-405e-b1b7-aacd191889a8n%40googlegroups.com.