Re: [Xen-devel] xencov split script / update

[Frediano Ziglio <frediano.ziglio@xxxxxxxxxx>]

On Tue, 2013-05-28 at 10:48 +0100, Frediano Ziglio wrote:
> On Fri, 2013-05-24 at 14:28 +1200, Matthew Daley wrote:
> > On Fri, May 24, 2013 at 1:51 AM, Frediano Ziglio
> > <frediano.ziglio@xxxxxxxxxx> wrote:
> > > On Thu, 2013-05-23 at 12:40 +1200, Matthew Daley wrote:
> > >> Hi Frediano,
> > >>
> > >> I'm looking at updating the xencov subsystem so that it supports the
> > >> new gcov structures compiled in by the latest GCC (
> > >> http://gcc.gnu.org/viewcvs/gcc/trunk/gcc/gcov-io.h?r1=173147&r2=181105
> > >> ).
> > >>
> > >> To this end, it'd be good to have the splitting script that you wrote
> > >> ( http://lists.xen.org/archives/html/xen-devel/2013-02/msg00053.html )
> > >> included in the Xen repo (ie. tools/misc), so that it can be similarly
> > >> updated to output the newer .gcda format GCC tools now expect. I
> > >> currently use my own intermediate data format along with a Python
> > >> script, but I'd like to use your Perl one if possible.
> > >>
> > >> - Matthew Daley
> > >
> > > Hi,
> > >   you are quite lucky, I was working on this stuff some days ago, I'll
> > > send the mail.
> > 
> > Thanks. Just to confirm, does that mean you're working on updating the
> > structure/gcda version too, or is that still up for grabs? :)
> > 
> 
> I checked with a gcc 4.6 compiler (-S option and looks at generated
> assembly) and the internal structured used by gcc are still the same. It
> seems that libgcov.h points to structures used by the tool library and
> object internal structures and .gcda structures are not changed.
> 

Mmm... just tested, they changed binary format in 4.07 version :(

Not that good.

Probably better to add support for new format too.

Frediano

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