linux-kernel - Re: [PATCH v2 13/14] perf util: do not consider empty files as valid srclines

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Date:   Mon, 7 Aug 2017 12:21:00 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Milian Wolff <milian.wolff@...b.com>
Cc:     Jin Yao <yao.jin@...ux.intel.com>, Linux-kernel@...r.kernel.org,
        Namhyung Kim <namhyung@...nel.org>,
        linux-perf-users@...r.kernel.org,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        David Ahern <dsahern@...il.com>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [PATCH v2 13/14] perf util: do not consider empty files as valid
 srclines

Em Sun, Aug 06, 2017 at 11:24:45PM +0200, Milian Wolff escreveu:
> Sometimes we get a non-null, but empty, string for the filename from
> bfd. This then results in srclines of the form ":0", which is
> different from the canonical SRCLINE_UNKNOWN in the form "??:0".
> Set the file to NULL if it is empty to fix this.

I cherry picked this one now, i.e. looks useful even before looking at
the other patches in depth.

- Arnaldo
 
> Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
> Cc: David Ahern <dsahern@...il.com>
> Cc: Namhyung Kim <namhyung@...nel.org>
> Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
> Cc: Yao Jin <yao.jin@...ux.intel.com>
> Signed-off-by: Milian Wolff <milian.wolff@...b.com>
> ---
>  tools/perf/util/srcline.c | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/tools/perf/util/srcline.c b/tools/perf/util/srcline.c
> index 0c5ee741c515..7bf38b78a1ba 100644
> --- a/tools/perf/util/srcline.c
> +++ b/tools/perf/util/srcline.c
> @@ -168,6 +168,9 @@ static void find_address_in_section(bfd *abfd, asection *section, void *data)
>  	a2l->found = bfd_find_nearest_line(abfd, section, a2l->syms, pc - vma,
>  					   &a2l->filename, &a2l->funcname,
>  					   &a2l->line);
> +
> +	if (a2l->filename && !strlen(a2l->filename))
> +		a2l->filename = NULL;
>  }
>  
>  static struct a2l_data *addr2line_init(const char *path)
> @@ -297,6 +300,9 @@ static int addr2line(const char *dso_name, u64 addr,
>  					     &a2l->funcname, &a2l->line) &&
>  		       cnt++ < MAX_INLINE_NEST) {
>  
> +			if (a2l->filename && !strlen(a2l->filename))
> +				a2l->filename = NULL;
> +
>  			if (node != NULL) {
>  				if (inline_list__append_dso_a2l(dso, node, sym))
>  					return 0;
> -- 
> 2.13.3