[llvm-dev] [RFC] Generate Debug Information for Labels in Function

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> -----Original Message-----
> From: llvm-dev [mailto:llvm-dev-bounces at lists.llvm.org] On Behalf Of via
> llvm-dev
> Sent: Thursday, March 29, 2018 1:54 PM
> To: aprantl at apple.com; hsiangkai at gmail.com
> Cc: llvm-dev at lists.llvm.org
> Subject: Re: [llvm-dev] [RFC] Generate Debug Information for Labels in
> Function
> 
> > Based on that I think it might be sufficient to have a flag on an IR
> label
> > that marks a user-originated label and triggers the backend to create a
> > DW_TAG_label for it. If we do need source location information for the
> > DW_TAG_label, we could grab it from the first instruction.
> 
> Are there languages where labels are scoped?  If so we'd need explicit
> metadata to identify the parent scope.  In C/C++ the only scope is the
> containing function, which I'm guessing we wouldn't need to specify
> (except for inlined functions? that might need some care to get right).
> 
> I feel compelled to point out that the top instructions in a block do not
> necessarily have a valid source location so we might want to carry that
> explicitly just for sanity's sake.

That is, carry the source location explicitly on the label.

> --paulr
> 
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