linux-kernel - Re: [PATCH tracing/kprobes v2 1/5] tracing/kprobes: Rename special variables syntax

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Date:	Mon, 5 Oct 2009 21:26:11 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Masami Hiramatsu <mhiramat@...hat.com>
Cc:	Steven Rostedt <rostedt@...dmis.org>, Ingo Molnar <mingo@...e.hu>,
	lkml <linux-kernel@...r.kernel.org>,
	systemtap <systemtap@...rces.redhat.com>,
	DLE <dle-develop@...ts.sourceforge.net>,
	Thomas Gleixner <tglx@...utronix.de>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Mike Galbraith <efault@....de>,
	Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Christoph Hellwig <hch@...radead.org>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Jim Keniston <jkenisto@...ibm.com>,
	"Frank Ch. Eigler" <fche@...hat.com>
Subject: Re: [PATCH tracing/kprobes v2 1/5] tracing/kprobes: Rename special
	variables syntax

On Mon, Oct 05, 2009 at 12:59:01PM -0400, Masami Hiramatsu wrote:
> As far as I can see in arch/*/include/asm/ptrace.h, all registers start with
> alphabets :-). So, I'd like to suggest renaming sp-vars to '_sp-vars'.
>
> Then, we will have;
> - $local-vars


There is a risk of bash collision.


> - @global-symbol


We could use global-symbol as is. Shadowing between global
and local vars could be dealt with scope resolution:

function:var
file:var
file:line:var

And throw errors while submitting a shadowed var name, crying until
the user defines the scope, only if needed of course (if there are
no shadowing detected, we can submit a naked variable name).


> - regs


That can conflict with variable names


> - _sp-vars


That too.


> - +|-Offs(ARG)

You mean for arg numbers?
So we would have +1 for argument 1?

arg(1) looks more easy to remember and to understand, no?

Thanks.

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