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From: Julia Lawall <julia.lawall@inria.fr>
To: Denis Efremov <efremov@linux.com>
Cc: cocci@systeme.lip6.fr, linux-kernel@vger.kernel.org
Subject: Re: [Cocci] [PATCH] coccinelle: misc: add swap script
Date: Wed, 17 Feb 2021 22:31:05 +0100 (CET)
Message-ID: <alpine.DEB.2.22.394.2102172224570.3081@hadrien> (raw)
In-Reply-To: <20210216080133.455456-1-efremov@linux.com>

> +@depends on patch@
> +identifier tmp;
> +expression a, b;
> +type T;
> +@@
> +
> +(
> +- T tmp;
> +|
> +- T tmp = 0;
> +|
> +- T *tmp = NULL;
> +)
> +... when != tmp
> +- tmp = a;
> +- a = b;
> +- b = tmp;
> ++ swap(a, b);
> +... when != tmp

In this rule and the next one, if you remove the final ; from the b = tmp
line and from the swap line, and put it into context code afterwards, them
the generated code looks better on cases like fs/xfs/xfs_inode.c in the
function xfs_lock_two_inodes where two successive swap calls are
generated.

There are also some cases such as drivers/net/wireless/ath/ath5k/phy.c in
the function ath5k_hw_get_median_noise_floor where the swap code makes up
a whole if branch.  In this cases it would be good to remove the {}.

julia

> +
> +@depends on patch@
> +identifier tmp;
> +expression a, b;
> +@@
> +
> +- tmp = a;
> +- a = b;
> +- b = tmp;
> ++ swap(a, b);
> +
> +@script:python depends on report@
> +p << r.p;
> +@@
> +
> +coccilib.report.print_report(p[0], "WARNING opportunity for swap()")
> +
> +@script:python depends on org@
> +p << r.p;
> +@@
> +
> +coccilib.org.print_todo(p[0], "WARNING opportunity for swap()")
> --
> 2.26.2
>
>
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Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-02-16  8:01 Denis Efremov
2021-02-16 18:05 ` Markus Elfring
2021-02-17 21:31 ` Julia Lawall [this message]
2021-02-18  6:13   ` Denis Efremov
2021-02-18 10:17     ` Julia Lawall
2021-02-18 11:03       ` Denis Efremov
2021-02-18 11:29         ` Julia Lawall
2021-02-18 11:34           ` Denis Efremov
     [not found]       ` <50eb8319-a552-c749-6143-7e24a8778a04@web.de>
2021-02-18 20:03         ` Julia Lawall
2021-02-19  9:05 ` [Cocci] [PATCH v2] coccinelle: misc: add minmax script Denis Efremov
2021-02-19  9:07   ` Denis Efremov
2021-02-19  9:24 ` [Cocci] [PATCH v2] coccinelle: misc: add swap script Denis Efremov
2021-03-03 16:37   ` Julia Lawall
2021-03-05 10:09 ` [Cocci] [PATCH v3] " Denis Efremov
     [not found]   ` <afb06bbc-5c28-8a92-f205-c9a1c87c707c@linux.com>
2021-04-04 12:33     ` Julia Lawall

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