P0881R7 `<stacktrace>`

[StephanTLavavej]

P0881R7 <stacktrace>
P2301R1 Add A pmr Alias For std::stacktrace

Feature-test macro:

#define __cpp_lib_stacktrace 202011L

Casey Carter (@CaseyCarter)'s internal VS-PR-339694 has taught the IDE to recognize this as a C++ header.

[miscco]

Does this require compiler support and should it be marked as blocked until compiler support is ready?

[leha-bot]

As I understood, no, we could just links to imghelp.dll and use its StackWalk() API.
I have a very draft WIP implementation for it :)

[AlexGuteniev]

There's an alternative -- CaptureStackBackTrace. It is faster than StackWalk, but it is not a part of complete API family.

There's also IDiaStackWalker::getEnumFrames2, but it is the same as StackWalk (apparently one is a wrapper on another).

[AlexGuteniev]

There's a caveat. Documentation of StackWalk64 and friends contains the following:

All DbgHelp functions, such as this one, are single threaded. Therefore, calls from more than one thread to this function will likely result in unexpected behavior or memory corruption. To avoid this, you must synchronize all concurrent calls from more than one thread to this function.

I'm not sure how to address this properly in <stacktrace>

[leha-bot]

CaptureStackBackTrace

Thanks, Alex, completely forgot about this kernrl32 function, would try it later.

[AlexGuteniev]

Alex (@leha-bot) , are you planning to submit a PR ?
I'm interested in this feature.

[leha-bot]

Yes, as a proposal co-author :)

[AlexGuteniev]

Wow)

[SuperWig]

Would it make sense to mark this issue as work in progress in that case?

[StephanTLavavej]

Sure, I've labeled this as "work in progress" and moved it to the Investigating column.

(Guess who's catching up on half-month-old notifications?)

[StephanTLavavej]

I've updated this issue to mention the patch paper P2301R1 "Add A pmr Alias For std::stacktrace" which was just accepted, with no changes to the feature-test macro.