linux-kernel - Re: [PATCH] tools/perf: Fix to get the DW_AT_decl_file and DW_AT_call

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Message-Id: <20221109083526.b5f052f5ab8c9dd930df38f1@kernel.org>
Date:   Wed, 9 Nov 2022 08:35:26 +0900
From:   Masami Hiramatsu (Google) <mhiramat@...nel.org>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Namhyung Kim <namhyung@...nel.org>,
        "Masami Hiramatsu (Google)" <mhiramat@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>, linux-perf-users@...r.kernel.org,
        linux-kernel@...r.kernel.org, Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [PATCH] tools/perf: Fix to get the DW_AT_decl_file and
 DW_AT_call_file as unsinged data

On Tue, 8 Nov 2022 18:08:27 -0300
Arnaldo Carvalho de Melo <acme@...nel.org> wrote:

> Em Mon, Nov 07, 2022 at 01:09:00PM -0800, Namhyung Kim escreveu:
> > Hi Masami,
> > 
> > On Fri, Nov 4, 2022 at 8:01 PM Masami Hiramatsu (Google)
> > <mhiramat@...nel.org> wrote:
> > >
> > > From: Masami Hiramatsu (Google) <mhiramat@...nel.org>
> > >
> > > Dwarf version 5 standard Sec 2.14 says that
> > >
> > >   Any debugging information entry representing the declaration of an object,
> > >   module, subprogram or type may have DW_AT_decl_file, DW_AT_decl_line and
> > >   DW_AT_decl_column attributes, each of whose value is an unsigned integer
> > >   constant.
> > >
> > > So it should be an unsigned integer data. Also, even though the standard
> > > doesn't clearly say the DW_AT_call_file is signed or unsigned, the
> > > elfutils (eu-readelf) interprets it as unsigned integer data and it is
> > > natural to handle it as unsigned integer data as same as DW_AT_decl_file.
> > > This changes the DW_AT_call_file as unsigned integer data too.
> > >
> > > Fixes: 3f4460a28fb2 ("perf probe: Filter out redundant inline-instances")
> > > Cc: stable@...r.kernel.org
> > > Signed-off-by: Masami Hiramatsu (Google) <mhiramat@...nel.org>
> > 
> > Acked-by: Namhyung Kim <namhyung@...nel.org>
> 
> Thanks, applied.

Thanks Namhyung and Arnaldo!

> 
> - Arnaldo
> 
>  
> > Thanks,
> > Namhyung
> > 
> > 
> > > ---
> > >  tools/perf/util/dwarf-aux.c |   21 ++++-----------------
> > >  1 file changed, 4 insertions(+), 17 deletions(-)
> > >
> > > diff --git a/tools/perf/util/dwarf-aux.c b/tools/perf/util/dwarf-aux.c
> > > index 30b36b525681..b07414409771 100644
> > > --- a/tools/perf/util/dwarf-aux.c
> > > +++ b/tools/perf/util/dwarf-aux.c
> > > @@ -315,19 +315,6 @@ static int die_get_attr_udata(Dwarf_Die *tp_die, unsigned int attr_name,
> > >         return 0;
> > >  }
> > >
> > > -/* Get attribute and translate it as a sdata */
> > > -static int die_get_attr_sdata(Dwarf_Die *tp_die, unsigned int attr_name,
> > > -                             Dwarf_Sword *result)
> > > -{
> > > -       Dwarf_Attribute attr;
> > > -
> > > -       if (dwarf_attr_integrate(tp_die, attr_name, &attr) == NULL ||
> > > -           dwarf_formsdata(&attr, result) != 0)
> > > -               return -ENOENT;
> > > -
> > > -       return 0;
> > > -}
> > > -
> > >  /**
> > >   * die_is_signed_type - Check whether a type DIE is signed or not
> > >   * @tp_die: a DIE of a type
> > > @@ -467,9 +454,9 @@ int die_get_data_member_location(Dwarf_Die *mb_die, Dwarf_Word *offs)
> > >  /* Get the call file index number in CU DIE */
> > >  static int die_get_call_fileno(Dwarf_Die *in_die)
> > >  {
> > > -       Dwarf_Sword idx;
> > > +       Dwarf_Word idx;
> > >
> > > -       if (die_get_attr_sdata(in_die, DW_AT_call_file, &idx) == 0)
> > > +       if (die_get_attr_udata(in_die, DW_AT_call_file, &idx) == 0)
> > >                 return (int)idx;
> > >         else
> > >                 return -ENOENT;
> > > @@ -478,9 +465,9 @@ static int die_get_call_fileno(Dwarf_Die *in_die)
> > >  /* Get the declared file index number in CU DIE */
> > >  static int die_get_decl_fileno(Dwarf_Die *pdie)
> > >  {
> > > -       Dwarf_Sword idx;
> > > +       Dwarf_Word idx;
> > >
> > > -       if (die_get_attr_sdata(pdie, DW_AT_decl_file, &idx) == 0)
> > > +       if (die_get_attr_udata(pdie, DW_AT_decl_file, &idx) == 0)
> > >                 return (int)idx;
> > >         else
> > >                 return -ENOENT;
> > >
> 
> -- 
> 
> - Arnaldo


-- 
Masami Hiramatsu (Google) <mhiramat@...nel.org>