A high performance WebAssembly interpreter written in C.

∼ 15.8x faster than other wasm interpreters (wac, life, wasm-micro-runtime)
∼ 4..5x slower than state of the art wasm JIT engines (liftoff, cranelift)
∼ 11.5x slower than native execution
_{* Based on CoreMark 1.0 benchmark. Your mileage may vary.}

Here's an online demo and a small getting started guide:

wasm3 passes the WebAssembly spec testsuite and is able to run many WASI apps.

Minimum useful system requirements: ~64Kb for code and ~10Kb RAM

wasm3 currently runs on a wide range of platforms:

• Linux, Windows, OS X
• Android
• Raspberry Pi, Orange Pi and other SBCs
• MCUs:
  Arduino MKR*, Arduino Due, Particle Photon,
  ESP8266, ESP32, Air602 (W600), nRF52, nRF51,
  Blue Pill (STM32F103C8T6), MXChip AZ3166 (EMW3166),
  Maix (K210), HiFive1 (E310), Fomu (ICE40UP5K), etc.
• OpenWRT-enabled routers
• Browsers... yes, using WebAssembly itself!
• wasm3 can execute wasm3 (self-hosting)

wasm3 is built on top of Steven Massey's novel interpreter topology, with:

• Wasm 1.0 spec conformance
• WASI support
• Support of x86, x64, ARM, MIPS, RISC-V, Xtensa architectures

See DEV.md

See test/README.md

This project is released under The MIT License (MIT)