> Presumably this particular implementation won't work if libcxxabi is
statically linked

Yes, that's right. But as the paper says - `libsfe` is just a prototype to
show that we can add `std::stacktrace::from_current_exception` without
breaking ABI. Library does not pretend to be a release implementation.

пн, 26 апр. 2021 г. в 19:57, Edward Catmur <ecatmur_at_[hidden]>:

> Presumably this particular implementation won't work if libcxxabi is
> statically linked?
>
> We hook exception throwing by subclassing std::type_info, overriding
> __do_catch, and using a small bit of asm to create a polymorphic type whose
> vtable points to that std::type_info subclass. This does admittedly mean
> that you can only access the stack trace if you have a catch specification
> with this custom type, but we find that usually where you want the stack
> trace you'd be doing `catch (...)` anyway so changing that to `catch
> (AnyException&)` isn't too onerous.
>
> Quick demo:
> https://gist.githubusercontent.com/ecatmur/8321439b4c8bb5f6851aa55ec2aeecc2/raw/9cdf7113d0056ae0975ecca80c43dc3c90ec7e62/prog3.c++
> And godbolt (slightly nerfed, but you get the idea):
> https://godbolt.org/z/caK3r8jbr
>
> I've occasionally thought that it'd be nice to be able to run arbitrary
> code at the throw point, but while we've had the technical ability to do so
> for a couple of years there hasn't been any demand, so probably just being
> able to access the current exception stack trace is sufficient.
>
> On Mon, 26 Apr 2021 at 17:32, Андрей Некрашевич via Std-Proposals <
> std-proposals_at_[hidden]> wrote:
>
>> Hello everybody!
>>
>> The feature of getting stacktraces from exceptions was requested in
>> https://lists.isocpp.org/std-proposals/2020/11/2086.php and in the "2021
>> Annual C++ Developer Survey".
>>
>> I've created a prototype for getting stacktraces from exceptions
>> https://github.com/axolm/libsfe.
>>
>> More details can be found in the paper D2370R0 "Stacktrace from
>> exception" here -
>> https://htmlpreview.github.io/?https://github.com/axolm/libsfe/blob/master/paper/stacktrace_from_exception.html
>>
>> Any comments are welcome!
>>
>> Regards, Andrei
>> --
>> Std-Proposals mailing list
>> Std-Proposals_at_[hidden]
>> https://lists.isocpp.org/mailman/listinfo.cgi/std-proposals
>>
>