`wasmu` 🕸️🤏

A small, embeddable WebAssembly runtime for memory-constrained environments.

wasmu is primarily designed as a runtime for WebAssembly apps on the DigiCron retro smartwatch. wasmu focuses more on memory usage over performance, making it suitable for any environment where memory usage is a concern.

The name wasmu is a play on words — wasm is an initialism for WebAssembly, and mu — or µ — is the SI unit prefix for micro.

Features

In-place interpretation, meaning that wasmu doesn't try to recompile the WebAssembly code into native machine code or another intermediate representation
- Low memory footprint — wasmu only needs to allocate a few tables and stacks alongside your WebAsesmbly code buffer
- Architecture-independent — works on a wide range of CPU architectures
Embeddable — single-header file that doesn't need stdio or stdlib to get working
- Written in C, can also be embedded in C++ projects
- Steppable interpreter, preventing infinite loops in WebAssembly from blocking the main thread
Customisable to fit your specific needs
- Define native modules that can be called from WebAssembly code
Designed for microcontrollers, but works on conventional computers and other platforms

Building

Before building wasmu, you will need to install some dependencies:

sudo apt install gcc wabt

To build the library, run:

./build.sh

The built library will then be available at dist/wasmu.h, with the configuration header file at dist/wasmu-config.h.

Testing

To run the unit tests, run:

./build.sh --test

Logs for each test are available at test/$TEST/build/test.log, where $TEST is the name of a test.

License

devicefuture/wasmu

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