Introducing Ruvy - Shopify

We’ve recently open sourced a project called Ruvy! Ruvy is a toolchain that takes Ruby code as input and creates a WebAssembly module that will execute that Ruby code. There are other options for creating Wasm modules from Ruby code. The most common one is ruby.wasm. Ruvy is built on top of ruby.wasm to provide some specific benefits. We created Ruvy to take advantage of performance improvements from pre-initializing the Ruby virtual machine and Ruby files included by the Ruby script as well as not requiring WASI arguments to be provided at runtime to simplify executing the Wasm module. WASI is a standardized collection of imported Wasm functions that are intended to provide a standard interface for Wasm modules to implement many system calls that are present in typical language standard libraries. These include reading files, retrieving the current time, and reading environment variables. To provide context for readers not familiar with WASI arguments, WASI arguments are conceptually similar to command line arguments. Code compiled to WASI to read these arguments is the same code that would be written to read command line arguments for code compiled to target machine code. WASI arguments are distinct from function arguments and standard library code uses the WASI API to retrieve these arguments. Using Ruvy At the present time, Ruvy does not ship with precompiled binaries so its build dependencies need to be installed and then Ruvy needs to be compiled before it can be used. The details for how to install these dependencies is available in the README. After building Ruvy, you can run: The content of ruby_examples/hello_world.rb  is: When running Ruvy, the first line builds and executes the CLI to take the content of ruby_examples/hello_world.rb and creates a Wasm module named index.wasm that will execute puts “Hello world” when index.wasm’s exported _start function is invoked. To use additional Ruby files, you can run: Where the content of ruby_examples/use_preludes_and_stdin.rb is: And the prelude directory contains two files. One with the

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