Understanding Every Byte in a WASM Module

• wasmcc

  1 3 7.7 C++

This is pretty great! I highly recommend building a parser for Wasm, it shows off the nice design that it can be compiled in a streaming fashion and other nice properties.

I built a small parser for a wasm runtime I was going to hack at, although that lost steam and now I just contribute to wasmtime, but it was a great way to learn. The source if you’re interested in C++20 and coroutines: https://github.com/rockwotj/wasmcc

• wat-compiler

  2 18 0.0 JavaScript

  webassembly wat text format to binary compiler

For some time I've been fascinated by the codebase of a small WAT compiler written in JavaScript.

https://github.com/stagas/wat-compiler/blob/main/story.txt

And I mean "small" as a real complement to how readable the entire compiler is. It's also been a great way to appreciate the design of the WASM text format and WASM overall. It's not a Lisp but has a similar feel to it.

I've been meaning to get more fluent at writing WAT directly, not for any practical purpose but just for pleasure of it. I could see myself gradually building up some abstractions to help me deveolp larger programs, perhaps a slightly higher-level language.

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• wabt

  21 6,380 8.7 C++

  The WebAssembly Binary Toolkit

  

This seems sort of like understanding machine code vs assembly; it's much easier to learn WAT and translate to/from WASM as necessary using the wabt tools [0].

Either way its super cool how simple WebAssembly is, you can really get your hands dirty and understand exactly every detail of how your program runs!

[0] https://github.com/WebAssembly/wabt

• bfasm

  2 0 10.0 WebAssembly

  more experiments in webassembly

I have a hand-written BF interpreter in WAT, along with hand-written asm.js for comparison, over here https://github.com/magcius/bfasm

• website

  1 56 6.8 HTML

  AssemblyScript's website and documentation. (by AssemblyScript)

  

• winter

  1 1 2.7 C++

  Winter is a WebAssembly interpreter for compiler development (by peterseymour)

I entered into WASM assuming it was simple and minimal but there are a lot of runtime edge cases that are quite surprising. I built an interpreter that passes all the non-SIMD test cases from the official spec. Would be interesting to clean-up the spec to be a real minimal execution only core. There is a real barrier to entry for producing new lightweight implementations.

https://github.com/peterseymour/winter

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