[llvm-dev] F18-LLVM: Unanswered but important points

[Doerfert, Johannes via llvm-dev]

Some comments:
 - We need to make sure not to confuse F18 and legacy flang. If I
   write/wrote flang, and I started on of those threads, I always mean
   F18 which is "new flang", soon to be llvm/flang.
 - With AST I meant whatever the parser + sema of F18 generates. To be
   honest, I haven't looked to closely at what that is but I expected an
   AST like structure to be present.
 - flang = f18 does not have IR generation, that was what the thread was
   about. Legacy flang has string based IR "printing".
 - We should have this discussion on the flang list
   (flang-dev at lists.llvm.org).

Thanks,
  Johannes

On 12/19, David Blaikie via llvm-dev wrote:
> "parser tree" and AST sound like they're probably the same thing - any
> reason to believe they aren't/any distinction between those terms you're
> aware of?
> (you probably want to CC relevant people from those thread into this
> one/whoever you're hoping to address these concerns - mailing lists can be
> high volume & people don't always find the threads they would like to
> contribute to)
> 
> On Thu, Dec 19, 2019 at 9:14 AM Rajesh K Singh via llvm-dev <
> llvm-dev at lists.llvm.org> wrote:
> 
> > Hello,
> >
> >
> >
> > This is regarding recent/ongoing discussions about F18 being merged in
> > LLVM.
> >
> > I was going through these threads, and I found few important points which
> > were possibly left unanswered (or I might have missed few threads).
> >
> >
> >
> > URL: http://lists.llvm.org/pipermail/flang-dev/2019-December/000120.html
> >
> > Point: Is (3) AST -> FIR -> MLIR LLVM-IR -> LLVM-IR) in a shape where we
> > can generate LLVM IR now? [*1]
> >
> >
> >
> > F18 generates parser tree after successful completion of parsing/semantics
> > phase.
> >
> > In the above point ([*1]) AST is mentioned. Do we mean that AST and parse
> > tree as same, as F18 does not generate anything known as AST.
> >
> > If not, are we planning to implement AST generation in F18?
> >
> >
> >
> > URL: http://lists.llvm.org/pipermail/llvm-dev/2019-December/137677.html
> >
> > Point: IR generation still appears to be text string based?
> >
> > F18 does not generate IR/FIR so far.
> >
> >
> >
> > Please enlighten on above points.
> >
> > Thanks in anticipation.
> >
> >
> >
> > Regards,
> >
> > Rajesh
> > _______________________________________________
> > LLVM Developers mailing list
> > llvm-dev at lists.llvm.org
> > https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
> >

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-- 

Johannes Doerfert
Researcher

Argonne National Laboratory
Lemont, IL 60439, USA

jdoerfert at anl.gov
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