Wrausmt

A WASM interpreter written in Rust, as a learning exercise

Goals

• Avoid using any 3rd party Rust libraries, so that I have to build more things on my own. This results in some seemingly silly behavior, like writing my own logging and error handling code, rather than using the obvious choices from the rust ecosystem. But this is intentional: I want to understand how you would make things like that, so I make simpler verisons on my own.

• Use the official WASM specification to guide the implementation.

• Make at least some attempt to make the execution implementation fast, without compromising code clarity. Since there are zero external dependencies this could end up being useful for limited code-size embedding applications. But thus far I'm not focusing on reducing code size as a goal.

• Organize the code so that it's easy to navigate and explore, and explore different Rust management strategies. It's possible that this code is over-crated, but that's intentional.

• Explore interesting rust patterns, new and upcoming nightly features, and try different ideas out.

Current State

At the moment, the implementation is nearly completely. The test and binary parsers and runtime pass all positive validation tests. The negative validation tests are a work in progress; as of writing this, all that remains is the validation tests: trap, malformed, exhaustion tests are all passing.

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