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Re: -symbol-list-lines


On Mon, Feb 16, 2004 at 08:20:35PM -0500, Daniel Jacobowitz wrote:
> On Mon, Feb 16, 2004 at 03:55:58PM -0500, Bob Rossi wrote:
> > On Mon, Feb 16, 2004 at 03:45:16PM -0500, Daniel Jacobowitz wrote:
> > > On Mon, Feb 16, 2004 at 03:40:35PM -0500, Bob Rossi wrote:
> > > > I am seeing 2 potential problems,
> > > > 
> > > > Several lines come back as {pc="0x08048406",line="0"},
> > > > should the value "0" be documented? or is it a bug?
> > > > 
> > > > Also, for some reason, a value is repeated
> > > > {pc="0x0804849c",line="38"}. Is this ok?
> > > 
> > > I can't say anything about what is appropriate (or useful) for the MI
> > > interface but I can tell you what's going on.  This matches the
> > > structure of the internal line table precisely.
> > > 
> > > - line 0 means end-of-sequence.  I.E. PCs greater than 0x8048406 that
> > > don't have a new starting line do not belong to this line number table.
> > 
> > I personally can't see why this would be useful to front ends. Can
> > anyone else? If it isn't, I will submit a patch to not print this data.
> > 
> > > - duplicated line numbers are emitted by the compiler to mark, mostly,
> > > the ends of prologues.  Sometimes the prologue is zero-sized.
> > 
> > Would keeping a list internally of numbers that have been sent out
> > already be reasonable? or is it repeating the data unimportant?
> > 
> > I would also be willing to fix this.
> 
> I don't know.  I think I'd prefer for frontends to tolerate this data;
> just because I can't think of a use for it now doesn't mean someone
> else won't later.  I was recently reminded that "front-end" can be a
> pretty broad concept, not just user interfaces.

Ok, well I'll submit a doco patch when I get the chance.
I will probably put your descriptions above, since I don't really even 
understand what they mean. I have no idea what a "prologue" is yet :)

I do think it would be good if these 2 case's where documented.

Bob Rossi


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