jdenny added a comment.
In D61509#1491119 <https://reviews.llvm.org/D61509#1491119>, @lebedev.ri wrote:
> I recommend to split this into two parts - changing `PragmaIntroducerKind
> Introducer` to
> `struct NameMe { PragmaIntroducerKind Kind; SourceLocation Loc};`, and the
> actual openmp change.
Sure, I'll work on that. What about NameMe = PragmaIntroducer?
> For that change, just basing off the clang-tidy diff, neither variant is
> ideal,
Do you mean that it's better for diagnostics that point to a pragma not to
include the `#pragma` in their locations? If so, why is that?
The other variant I originally proposed doesn't alter existing locations and so
wouldn't affect diagnostics, but Alexey pointed out potential issues for
changes it requires in the parser.
> so i'd like to see the proposed use-case.
That's a bit tricky. I'll explain.
My use case right now is not for OpenMP locations but for OpenACC locations in
our Clacc project, which is not upstream. Clacc is calling Rewriter and
passing locations from the OpenACC AST in order to rewrite the OpenACC pragmas
to OpenMP. Without the location for an OpenACC pragma's `#pragma`, Clacc
cannot easily remove an OpenACC pragma or insert code before it. At least not
that I found. Of course, I'd be happy for someone to explain to me how
Rewriter was designed to be used differently. I'd also be happy to share
relevant code samples from Clacc if that would help.
So what does this have to do with OpenMP locations? I'm anticipating that
someone will one day want to use Rewriter in this way with other pragmas, so
I'm offering some scaffolding toward that goal for all pragmas, and I'm
completing the fix only for OpenMP, which is the existing pragma set I
understand best. Moreover, offering this now facilitates keeping Clacc up to
date with master and eventually considering it for upstreaming.
Thanks for your responses.
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