FOfollower·Mar 15, 2020
I've recently been working on WASM VM embedding with C (well, via libffi) for a personal project and uncovered a couple of WASM VM options, wasmtime & wasmer:
* https://github.com/bytecodealliance/wasmtime
* https://wasmerio.github.io/wasmer/c/runtime-c-api/
The underlying implementation of each is written in Rust.
(Recently I also discovered there's a "micro VM" too: https://github.com/bytecodealliance/wasm-micro-runtime)
The official WASM C API is still WIP but wasmtime targets it directly: https://github.com/WebAssembly/wasm-c-api/
Not sure if Wasmer is aiming for compatibility with the official WASM C API currently.
From my experience, Wasmtime's C support is probably best described as "under-documented but functioning".
I haven't implemented anything with Wasmer.
My impression is that Wasmer may offer a higher level API than Wasmtime
Read the rest
but not sure if it counts as "drop in" yet.
Part of the reason why I ended up going with Wasmtime was...I kinda forgot Wasmer existed. :D But also I do like that they're targeting what will hopefully become a standard API--but I think that results in a lower level API than what is most "friendly" for starting out.
Been meaning to make this embedded Wasmtime C API example--created while figuring things out--public after tidying it up a bit more but... well, I just now made it public, as is (it at least has a ReadMe now :D ): https://gitlab.com/RancidBacon/wasm-embed-test :)
Also, this is one option for test compiling C to WASM without setting up a tool chain: https://wasdk.github.io/WasmFiddle/
Some of my notes from development so far: http://www.labradoc.com/i/follower/p/notes-webassembly#20200...
Edit: Grammar. Add & then move micro WASM VM link.