Unwinding through V8

[snek]

Can foreign exceptions unwind through V8? In particular I'm curious if rust code interfacing with V8 needs to be marked as unsafe for unwinding. I see that V8 generally keeps track of stack pointers and also contains some machinery for managing eh_frame data but I'd appreciate some clarification on what behavior can be relied on. Thanks!

[Ben Noordhuis]

On Fri, Jul 5, 2024 at 7:55 PM snek <sn...@chromium.org> wrote:
>
> Can foreign exceptions unwind through V8? In particular I'm curious if rust code interfacing with V8 needs to be marked as unsafe for unwinding. I see that V8 generally keeps track of stack pointers and also contains some machinery for managing eh_frame data but I'd appreciate some clarification on what behavior can be relied on. Thanks!

No, it can't. V8 is not exception/unwind-safe.

You can unwind in your own code but you need to catch it at the points
where control goes into or comes out of V8.