linux-kernel - Re: coccinelle and bitmask arithmetic (was: Re: [patch] TTY: synclink, small cleanup in dtr

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Message-ID: <alpine.DEB.2.02.1301291937250.3339@hadrien>
Date:	Tue, 29 Jan 2013 19:38:19 +0100 (CET)
From:	Julia Lawall <julia.lawall@...6.fr>
To:	Joe Perches <joe@...ches.com>
cc:	Valdis.Kletnieks@...edu, cocci@...teme.lip6.fr,
	Dan Carpenter <dan.carpenter@...cle.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Slaby <jslaby@...e.cz>,
	Paul Fulghum <paulkf@...rogate.com>,
	David Howells <dhowells@...hat.com>,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: coccinelle and bitmask arithmetic (was: Re: [patch] TTY: synclink,
 small cleanup in dtr_rts())

The following rule looks promising:

@r@
constant c;
identifier i;
expression e;
@@

(
e | c@i
|
e & c@i
|
e |= c@i
|
e &= c@i
)

@@
constant r.c,c1;
identifier i1;
expression e;
@@

*c1@i1 + c

That is, the sum of two constants where at least one of them has been used
with & or |.

julia
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