Stream: wasmtime

Topic: Exception Standard

view this post on Zulip Cwasi4wasm (May 28 2025 at 12:43):

Hello was wondering if the Exception Standard is something that is on the horizon in the next few months or so? I checked the wasmtime repo and see we have try_call support but not aure of the extens of the support.

My project might need me to interact with the exception standard

view this post on Zulip bjorn3 (May 28 2025 at 13:32):

Cranelift support exceptions, but it hasn't been wired up to Wasmtime yet. The RFC for adding it has been accepted: https://github.com/bytecodealliance/rfcs/pull/36 It is blocked on someone finding the time to actually implement it. Also cc https://github.com/bytecodealliance/wasmtime/issues/3427

Implementing the exception handling proposal in Wasmtime by dhil · Pull Request #36 · bytecodealliance/rfcs
This RFC proposes to implement the exception handling proposal in Wasmtime. At the time of writing, exception handling is a phase 4 proposal. I think there are lots of details worth discussing abou...
Implementation strategy for the Exception Handling proposal · Issue #3427 · bytecodealliance/wasmtime
I've been interested in having the Exception Handling proposal supported in Wasmtime, so I looked into possible ways to implement it. There's been some prior discussion in issues #2049 and #1677, b...

view this post on Zulip Chris Fallin (May 28 2025 at 17:02):

@Cwasi4wasm I'm planning on building the Wasmtime side of exception support soon! I indeed built the Cranelift half a few months ago (just released last week); I've been juggling this with a bunch of internal work on a deadline as well, and a two-week conference trip coming up soon, etc etc. But it's likely I'll be able to get to it over the next few months.

view this post on Zulip Cwasi4wasm (May 30 2025 at 12:56):

Chris Fallin said:

Cwasi4wasm I'm planning on building the Wasmtime side of exception support soon! I indeed built the Cranelift half a few months ago (just released last week); I've been juggling this with a bunch of internal work on a deadline as well, and a two-week conference trip coming up soon, etc etc. But it's likely I'll be able to get to it over the next few months.

Awesome! I will keep a close eye on it! Thank y'all for the great work

view this post on Zulip Cwasi4wasm (Jun 10 2025 at 18:31):

Chris Fallin said:

Cwasi4wasm I'm planning on building the Wasmtime side of exception support soon! I indeed built the Cranelift half a few months ago (just released last week); I've been juggling this with a bunch of internal work on a deadline as well, and a two-week conference trip coming up soon, etc etc. But it's likely I'll be able to get to it over the next few months.

Awesome thank you, I will keep an eye on this!

Last updated: Dec 06 2025 at 06:05 UTC