linux-kernel - Re: [PATCH] coccinelle: assign signed result to unsigned variable

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Date:	Sat, 26 Sep 2015 11:55:46 +0200 (CEST)
From:	Julia Lawall <julia.lawall@...6.fr>
To:	SF Markus Elfring <elfring@...rs.sourceforge.net>
cc:	Julia Lawall <julia.lawall@...6.fr>,
	Andrzej Hajda <a.hajda@...sung.com>,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
	Gilles Muller <Gilles.Muller@...6.fr>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Michal Marek <mmarek@...e.com>,
	Nicolas Palix <nicolas.palix@...g.fr>,
	kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org,
	cocci@...teme.lip6.fr
Subject: Re: [PATCH] coccinelle: assign signed result to unsigned variable



On Sat, 26 Sep 2015, SF Markus Elfring wrote:

> > Your approach finds a function definition.
>
> Yes. - I assumed that it might also be relevant.
>
>
>
> > My approach works on the call directly, using whatever type information is available.
>
> The connection between the SmPL specification "f(...)@e" and the desired return type
> was not obvious for me so far.

The nearest enclosing expression of the ) is the whole function call
itself.  e will thus match the entire expression.  e is declared to have
type t (where t is in practice signed int or whatever one wants to check
for).

julia
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