Inform 6 says "Hello, WebAssembly!"

[rockwalrus (Nathan Summers)]

@Dannii

I’ve found Asyncify works quite well for blocking the interpreter. In Emglken there’s only one actual async function, getc , but dozens or hundreds of other functions which call it also need to be handled. Emscripten takes care of that for you.

And it might be possible to run the Asyncify algorithm on wasm code generated by Rust?

Theoretically you can run binaryen’s standalone wasm-opt tool in asyncify mode on it. As a practical matter, how well that will work depends on whether binaryen produces the WebAssembly constructs used by the Rust compiler. I’ve never seen it have a problem with any WebAssembly 1.0 instructions, but newer ones can come out of wasm-opt severely suboptimal or wrong.

For example:

wasm-opt doesn't support loops with parameters

(The code in question is almost verbatim from an Inform 6 for loop.)

Of course, there’s nothing stopping the Rust compiler from implementing Asyncify itself. The algorithm is pretty straightforward.