This project showcases:

1. How to create a WebAssembly module from Rust using a custom ABI
2. How to use this module from a host environment

Rust target wasm32-unknown-unknown. You can install it with rustup target add wasm32-unknown-unknown.

First, let's compile our app into a WebAssembly Module.

rustc --target=wasm32-unknown-unknown app.rs

This should have produced a app.wasm file ready to be used anywhere.

The module is defined as:

(module
  (import "customabi" "print" (func $print (type $t0)))
  (import "customabi" "exit" (func $exit (type $t1)))
  ;; ...
)

Now we should be ready to run the app.wasm file our host environment!

cargo run

This will output the following in shell:

Hello, World! from HOST_NAME
Do exit with code 0
Here are the logged calls: ["print", "exit"]