🎉 wasm2lua 🎊

Have YOU ever wanted to run C++/C/Rust/javascript/banana/etc. on Lua without using native modules?

GOOD NEWS, fam: wasm2lua can compile WebAssembly modules to pure Lua (or with FFI LuaJIT for extra speed). This means that anything that can be compiled to WASM can be compiled to Lua! Long Live John Lua!

Notes

The generated code is heavily dependent upon the LuaJIT bit library
Some of @webassemblyjs's libraries are monkey patched at runtime
luamin is monkey patched at runtime
The WASI API is still under heavy development
Emscripten is NOT supported out of the box. You will need to compile things via the WASI ecosystem.

Usage

wasm2lua <in.wasm> <out.lua>

lua-webidl <in.idl> <out.cpp> --cpp

(Run those commands with --help for other options)

See HOWTO-BINDINGS.md in this repository for reference on how to use the WebIDL binder.

Installation

npm i -g wasm2lua

Projects that use `wasm2lua`

bullet3-lua (Releases, Demo), built with CMake
brotli-lua (Releases, Demo), built with CMake
tiny-regex-lua (Demo), built with a Makefile

BONUS: duktape via wasm2lua

int main(int argc, char *argv[]) {
	duk_context *ctx = duk_create_heap_default();

	(void) argc; (void) argv;  /* suppress warning */

	duk_push_c_function(ctx, native_print, DUK_VARARGS);
	duk_put_global_string(ctx, "print");
	duk_push_c_function(ctx, native_adder, DUK_VARARGS);
	duk_put_global_string(ctx, "adder");

	duk_eval_string(ctx, "print('Hello world!');");

	duk_eval_string(ctx, "print('2+3=' + adder(2, 3));");
	duk_pop(ctx);  /* pop eval result */

	duk_destroy_heap(ctx);

	return 0;
}