Note

I regret to inform the community that since my house was destroyed by russians who invaded my country, Wasm3 will enter a minimal maintenance phase. At this time, I am unable to continue the development of new features. However, I am committed to keeping the project alive and will actively review and merge incoming Pull Requests. I deeply appreciate your understanding and support during this difficult period. Your contributions to Wasm3 are now more valuable than ever.

Wasm3

A fast WebAssembly interpreter and the most universal WASM runtime.
_{Based on CoreMark 1.0 and independent benchmarks. Your mileage may vary.}

Installation

Please follow the installation instructions.

Wasm3 can also be used as a library for:

Python3 │ Rust │ C/C++ │ GoLang │ Zig │ Perl
Swift │ .Net │ Nim │ Arduino, PlatformIO, Particle │ QuickJS

Status

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 runs on a wide range of architectures (x86, x86_64, ARM, RISC-V, PowerPC, MIPS, Xtensa, ARC32, ...) and platforms:

Linux, Windows, OS X, FreeBSD, Android, iOS
OpenWrt, Yocto, Buildroot (routers, modems, etc.)
Raspberry Pi, Orange Pi and other SBCs
MCUs: Arduino, ESP8266, ESP32, Particle, ... see full list
Browsers. Yes, using WebAssembly itself!
wasm3 can execute wasm3 (self-hosting)

Features

Webassembly Proposals	Extra
☑ Import/Export of Mutable Globals	☑ Structured execution tracing
☑ Non-trapping float-to-int conversions	☑ Big-Endian systems support
☑ Sign-extension operators	☑ Wasm and WASI self-hosting
☑ Multi-value	☑ Gas metering
☑ Bulk memory operations (partial support)	☑ Linear memory limit (< 64KiB)
⏳ Custom page size
⏳ Multiple memories
⏳ Reference types
☐ Tail call optimization
☐ Fixed-width SIMD
☐ Exception handling
☐ Stack Switching

Motivation

Why use a "slow interpreter" versus a "fast JIT"?

In many situations, speed is not the main concern. Runtime executable size, memory usage, startup latency can be improved with the interpreter approach. Portability and security are much easier to achieve and maintain. Additionally, development impedance is much lower. A simple library like Wasm3 is easy to compile and integrate into an existing project. (Wasm3 builds in a just few seconds). Finally, on some platforms (i.e. iOS and WebAssembly itself) you can't generate executable code pages in runtime, so JIT is unavailable.

Why would you want to run WASM on embedded devices?

Wasm3 started as a research project and remains so by any means. Evaluating the engine in different environments is part of the research. Given that we have Lua, JS, Python, Lisp, ... running on MCUs, WebAssembly is a promising alternative. It provides toolchain decoupling as well as a completely sandboxed, well-defined, predictable environment. Among practical use cases we can list edge computing, scripting, plugin systems, running IoT rules, smart contracts, etc.