Re: Line number notes revamp?

[Daniel Berlin <dan at cgsoftware dot com>]

Richard Henderson <rth@redhat.com> writes:

> On Wed, Sep 12, 2001 at 04:46:43PM +0200, Jan Hubicka wrote:
> > I think for line numbers we should use same - have REG_LINENUM note
>> that has value pointing to the linenum record - eighter represented
>> in RTL as (linenum line column string) or separately.
>
> I think having a dedicated field in the INSN rtx will use less space.
>
I did this, and it puts the RTX's into the next bucket.
You need column number as well.

> We could have a magic value (0?) that means "no assigned line number",
> which means that no line number entry is emitted for this insn, which
> means it appears at whatever line number is assigned to some preceeding
> insn.
>
>> (we may want to attach multiple lines to single insn in combining).
>
> Why?  How would you represent this in the debug format?
>
>> later we may add linenum_emit_insn instruction familly to handle this in cases
>> we want to emit new instruction with line number information atached.
>
> Possibly.  But there are lots of insns that we emit (particularly spill
> code) for which no line number is necessarily appropriate.
>
>
> r~

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