linux-kernel - Re: [BUG] perf tools: Demangle kernel and kernel module symbols too

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Message-ID: <20140914094112.GT346@worktop.programming.kicks-ass.net>
Date:	Sun, 14 Sep 2014 11:41:12 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Avi Kivity <avi@...udius-systems.com>
Cc:	Jiri Olsa <jolsa@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	linux-kernel@...r.kernel.org, David Ahern <dsahern@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Namhyung Kim <namhyung@...nel.org>,
	Paul Mackerras <paulus@...ba.org>,
	Stephane Eranian <eranian@...gle.com>,
	Jan Stancek <jstancek@...hat.com>
Subject: Re: [BUG] perf tools: Demangle kernel and kernel module symbols too

On Sat, Sep 13, 2014 at 06:34:37AM +0300, Avi Kivity wrote:

> It's not a simple matter of updating the test: the demangler interprets name
> beginning with __vt as C++ mangles names, which of course they aren't.

Oh, that'll give cute 'problems' in a mixed C/C++ project that just
happens to have __vt names in. Now of course I'm aware that C/C++
'reserve' the __ prefix, which I suppose that makes it less likely in
practise.

> The only way I see to proceed is to make the demangling optional, default
> off.

Seems like a good way out, we could think about adding a language
heuristic that tries and guess the target language and auto enables when
it guesses C++, but that needs to have overrides as well.
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