[llvm-dev] RFC: libtrace

Zachary Turner via llvm-dev llvm-dev at lists.llvm.org
Tue Jun 26 13:55:33 PDT 2018

Ahh, thanks.  I thought those changes never landed, but it's good to hear
that they did.

On Tue, Jun 26, 2018 at 1:49 PM Adrian Prantl <aprantl at apple.com> wrote:

> > On Jun 26, 2018, at 1:38 PM, Zachary Turner <zturner at google.com> wrote:
> >
> >> On Tue, Jun 26, 2018 at 1:28 PM Adrian Prantl <aprantl at apple.com>
> wrote:
> >>
> >>> > On Jun 26, 2018, at 11:58 AM, Zachary Turner via llvm-dev <
> llvm-dev at lists.llvm.org> wrote:
> >>> > A good example of this would be LLDB’s DWARF parsing code, which is
> more featureful than LLVM’s but has kind of evolved in parallel.  Sinking
> this into LLVM would be one early target of such an effort, although over
> time there would likely be more.
> >>>
> >>> As you are undoubtedly aware we've been carefully rearchitecting
> LLVM's DWARF parser over the last few years to eventually become featureful
> enough so that LLDB could use it, so any help on that front would be most
> welcome. As long as we are careful to not regress in performance/lazyness,
> features and fault-tolerance, deduplicating the implementations can only be
> good for LLVM and LLDB.
> >>>
> >> Yea, this is the general idea.   Has anyone actively been working on
> this specific effort recently?  To my knowledge someone started and then
> never finished, but the efforts also never made it upstream, so my
> understanding is that it's a goal, but one that nobody has made significant
> headway on.
> >
> That's not true. Greg Clayton started the effort in 2016 and landed many
> of the ground-breaking changes. The design ideas fleshed out during that
> initial effort (thanks to David Blaikie who spent a lot of time reviewing
> the new interfaces!) such as improved error handling where then picked up
> the entire team of contributors who worked on DWARF 5 support in LLVM and
> we've continued down that path ever since. The greatly improved
> llvm-dwarfdump was also born out of this effort, for example. We also payed
> attention that every refactoring of LLDB DWARF parser code would bring it
> closer to the new LLVM parser interface to narrow the gaps between the
> implementations.
> -- adrian
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