wasm-examples

Some small demos written by hand to explore WASM

Repo structure

• wasm - small examples in pure wasm. Additional code (js) needed to load and run them.
• wasm-wasi - wasm programs that can be executed via runtime with WASI system interface support (e.g. wasmer).

Requirements

• wabt to compile *.wat source codes to binary *.wasm progs
• wasmer to run compiled *.wasm files with WASI interface
• (optional) nodejs to run tests

There is also nix flake with everything needed

Run

Tests

npm test

wasm-wasi

To run wasm-wasi examples, use run script to build and run *.wat files.

wasm-wasi/run wasm-wasi/hello-world

Useful links

WAT Spec
WASM Semantics
Index of instructions

WASM Opcodes table

MDN:

• WASM Concepts
• Understanding WAT

Web WASM files explorer WAT to WASM online

WASM Feature Extensions and their support table

WASI docs

• preview1 docs

awesome-wasm-tools collection

webassemblyjs - WASM related stuff for JS

A complete novice writes Wasm by hand series:

• Parsing Numbers
• Adding an Allocator

coderundebug's WAT series

• WAT reference
• i32 operations

dkwr blog wasm posts

• Wasm: A technical view
• Dive into Wasm: Functions
• Writing Wasm: modules
• Dive into Wasm: Control flow instructions
• Accessing and storing to memory in Wasm
• Wasm variable instructions
• Step by step towards wasm tables
• Wasm: SIMD operations
• Wasm: The Garbage Collection proposal

Writing GameOfLife in WASM

wabt.js - library to compile wat to wasm right in your js code without invoking external tools

Examples:

• quicsort
• fibonacci
• raw wasm demos

Nondeterminism in WebAssembly