linux-kernel - Re: [PATCH v2] Re: perf annotate segfaults when source code has goto label that looks like hex number

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Date:	Thu, 22 Jul 2010 16:11:32 -0300
From:	Arnaldo Carvalho de Melo <acme@...radead.org>
To:	Gleb Natapov <gleb@...hat.com>
Cc:	linux-kernel@...r.kernel.org, mingo@...e.hu, peterz@...radead.org,
	paulus@...ba.org
Subject: Re: [PATCH v2] Re: perf annotate segfaults when source code has goto
 label that looks like hex number

Em Thu, Jul 22, 2010 at 09:05:38PM +0300, Gleb Natapov escreveu:
> On Thu, Jul 22, 2010 at 02:05:42PM -0300, Arnaldo Carvalho de Melo wrote:
> > Em Thu, Jul 22, 2010 at 01:52:22PM -0300, Arnaldo Carvalho de Melo escreveu:
> > > Em Thu, Jul 22, 2010 at 01:47:11PM -0300, Arnaldo Carvalho de Melo escreveu:
> > > It could be a comment of play code, like:

> > >       while(1) {
> > >               if (++i == 10000000)
> > >                       goto add;
> > >       }
> > > add:	return 0;

> > What about this one?

> > diff --git a/tools/perf/util/hist.c b/tools/perf/util/hist.c
> > @@ -976,13 +976,15 @@ static int hist_entry__parse_objdump_line(struct hist_entry *self, FILE *file,
> >  	if (line_ip != -1) {
> >  		u64 start = map__rip_2objdump(self->ms.map, sym->start);
> >  		offset = line_ip - start;
> > +		if (offset < 0 || (u64)line_ip > sym->end)
> > +			offset = -1;

> This part is good idea anyway. Even if label will be interpreted as ip
> perf at least will not crash. It may miss-report something if check will
> accidentally succeed though.

Yeah, we can possibly find a label which is a valid hex number and that
falls inside the address range, but with what we have in objdump this
seems to be the best we can have, I'll commit this.

- Arnaldo
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