DWARF support

[Sven Tennie]

Am Fr., 19. Nov. 2021 um 01:09 Uhr schrieb Ben Gamari <ben at smart-cactus.org
>:

> Artem Pelenitsyn <a.pelenitsyn at gmail.com> writes:
>
> > Another question would be where do I read about Haskell-native stack
> > unwinder. The issue and MR Ben referenced have descriptions, but the MR
> > didn't touch anything inside `docs` which is a bit scary. Are there any
> > good recourses to dive into it besides the source code in the MR?
> >
> Indeed the user's guide documentation surrounding info table provenance
> should be updated to note this new capability.
>

Hey Ben, Hey Artem, Hey all,

Thanks for bringing this up! I'll add some documentation to the user's
guide and will likely write a blog post covering the "material" from notes
in a more approachable way.

Two details to note regarding the IPE based backtrace mechanism:

- It's based on return frames on the STG stack. So, it doesn't work for
trivial programs. A return frame is produced when the scrutinee of a case
expression is evaluated.
The test [1] shows a working example.

- To get backtraces containing references in libraries, those have to be
compiled with `-finfo-table-map`, too.

Now that I've got the attention of many GHC-Devs: A big Thank-You! goes to
Ben and Matthew that were always reachable and always very helpful during
the whole development process of this feature!

Best regards,

Sven

[1] -
https://gitlab.haskell.org/ghc/ghc/-/blob/aed98ddaf72cc38fb570d8415cac5de9d8888818/testsuite/tests/rts/decodeMyStack.hs
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