John Marvin Cadacio (Feb 16 2021 at 11:06): John Marvin Cadacio (Feb 16 2021 at 11:06):I have a function written in Rust that takes a parameter of usize, and returns a mut u8. How do I call this type of function in Python?
bjorn3 (Feb 16 2021 at 11:08):Wasm only has the i32 and i64 types. usize maps to i32 as wasm uses 32bit pointers. Everything smaller than i32 also maps to i32. I am not sure if it is zero or sign extended though.
John Marvin Cadacio (Feb 16 2021 at 11:10):What I have done was casting my int to int32 using NumPy. However, I get an error when converting.
bjorn3 (Feb 16 2021 at 11:10):What is the error?
bjorn3 (Feb 16 2021 at 11:11):In the example I don't see any casting necessary: https://github.com/bytecodealliance/wasmtime-py/blob/82e61606594b5fbf7199a2e9a1fbbc881261abbb/examples/multi.py#L33-L34
John Marvin Cadacio (Feb 16 2021 at 11:17):When I called a function that returns a mutable u8, I get a mut u8 1209328 from Rust. However, I need to use that value in another Wasm function, and it fails because it cannot be casted to int32 for some reason.
bjorn3 (Feb 16 2021 at 11:18):I unfortunately don't think I can help any further. I haven't ever used wasmtime-py.
John Marvin Cadacio (Feb 16 2021 at 11:19):Thank you for the help.
John Marvin Cadacio (Feb 16 2021 at 12:21):@bjorn3 Nevermind, I managed to fix the problem by not casting it int32at all.
Last updated: Dec 23 2024 at 12:05 UTC