source debugging of compiled wasm

[ferologics]

is there any support for debugging source code compiled to wasm in sight? (i.e. Rust code)

[RReverser]

It's already been working for a while for C / C++: https://developer.chrome.com/blog/wasm-debugging-2020/

As for other languages, it's up to respective toolchains to correctly emit debugging information. Rust support in particular - assuming you're talking about the Web via wasm-bindgen - is tracked on their own repo at rustwasm/wasm-bindgen#2389.

[ferologics]

@RReverser thx, the use case I have in mind is for non-web Rust, no wasm-bindgen, just FFI pointers, compiled with cargo build --target wasm32-unknown-unknown, interpreted by wasm3. I'd like to debug this wasm in runtime like regular Rust code, put a breakpoint, step through, etc., but am not sure how/if that should work in such setup.

[RReverser]

Then it's up to wasm3 to implement debugging, although knowing the author's situation (he's a Ukrainian who lost his home to Russian bombarding), I don't know if he'll have time / priority to work on it soon.

Rust itself emits debug symbols correctly though, and some runtimes like wasmtime already make use of it: https://docs.wasmtime.dev/examples-debugging.html

Either way, this is not really an issue / discussion for the standards repo, since it's up to specific runtimes to implement the necessary functionality now.

[ferologics]

okay, thanks a lot for your response, unfortunately I can't use wasmtime due to JIT compilation, so wasm3 is the only option.