linux-kernel - Re: [PATCH] basic perf support for sparc

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Message-Id: <1249382332.7924.192.camel@twins>
Date:	Tue, 04 Aug 2009 12:38:52 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Frederic Riss <frederic.riss@...il.com>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Kyle McMartin <kyle@...artin.ca>,
	Jens Axboe <jens.axboe@...cle.com>,
	Anton Blanchard <anton@...ba.org>, davem@...emloft.net,
	linux-kernel@...r.kernel.org, fweisbec@...il.com,
	benh@...nel.crashing.org, penberg@...helsinki.fi,
	vegard.nossum@...il.com, paulus@...ba.org, williams@...hat.com
Subject: Re: [PATCH] basic perf support for sparc

On Tue, 2009-08-04 at 12:32 +0200, Frederic Riss wrote:
> 2009/8/4 Ingo Molnar <mingo@...e.hu>:
> >
> > * Arnaldo Carvalho de Melo <acme@...hat.com> wrote:
> >
> >> +static void load_perf_bfd_demangle(void)
> >> +{
> >> +     void *handle = dlopen("libbfd-2.19.51.0.2-17.fc11.so", RTLD_NOW);
> >
> > Hm, this does not look like a very generic solution. Is there some
> > way to do a library search to figure out the name? I guess a glob
> > match on /usr/lib/libbfd*.so?
> 
> If all you want is C++ symbols demangling, why not just look for the
> c++filt binary on the system? It accepts mangled names on its stdin
> and outputs the demangled name on stdout.  You can keep it running in
> the background, and communicate through pipes. Of course it's not as
> effective as a library call, but I guess that it'll be much more
> generic and also much more likely to be found on a developer's system
> than a libbfd shared library.

Oddly enough c++filt uses libbfd :-)

$ ldd `which c++filt`
        linux-gate.so.1 =>  (0xffffe000)
        libbfd-2.19.1.so => /usr/lib/libbfd-2.19.1.so (0xf7de9000)
        libz.so.1 => /lib/libz.so.1 (0xf7dd3000)
        libc.so.6 => /lib/tls/i686/cmov/libc.so.6 (0xf7c6f000)
        /lib/ld-linux.so.2 (0xf7ef9000)


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