Interpreting WebAssembly Modules with Rust
If we really enjoyed punishing ourselves with loads of tedious work, we could start with the binary interface and write a parser for it. We could then write code that maintains the stack state, executes the various WebAssembly core instructions, and manages linear memory and all the other things needed for the low-level interface.
Thankfully we don’t have to do that. The creators of the wasmi[30] crate have done us a huge favor in that regard. Originally designed as a way to help Parity Tech create an ethereum client for contracts implemented in WebAssembly, Parity pulled the core pieces out of their code and made separate crates for interpreting and manipulating WebAssembly modules.
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