Transpiling WebAssembly modules into .NET assemblies

Wasm2cil can convert a WebAssembly module into a .NET assembly on disk. The resulting DLL is not interpreted — it contains the same functions as the WebAssembly module, translated from Wasm instructions to CIL instructions. The dependency on the WASI "system calls" is provided with a C# implementation of those calls in a supporting assembly.

This talk would include

• an overview of WebAssembly and WASI;
• deep dive into some contrasts between the Wasm instruction set and CIL;
• discussion of implementing WASI with .NET;
• wasm2cil architecture and how it works.

Technologies covered or mentioned will include WebAssembly (Wasm), WASI, Wasmtime, Mono.Cecil, CIL, .NET Core, Rust. In addition, wasm2cil itself is implemented with a mixture of F# and C#, but I do not plan to speak about F# issues.

The subject matter of this talk is rather advanced, so the target audience is experienced .NET developers, ideally with some previous understanding of CIL and the CLR.