How to register HostFunction into WASM Runtime?

Question

When I read the code of the wasmtime executor, I can't understand the way to register the HostFunction to the wasm module. What is the role of the sp_wasm_interface::HostFunctionRegistry trait? How is the parameter func of the function register_static passed in?

I have to solve this problem when I want to use a different wasm runtime instead of wasmtime or wasmi. However, I can't find a way to get the HostFunction's function body.

Answer 1

I don't have an answer to the exact problem and a low level primitive crates, but a common question is how to add new host functions to the WASM runtime, and use them in a FRAME-based runtime, and the answer is explained here.