linux-kernel - Re: [Cocci] [PATCH] coccinelle: misc: add excluded_middle.cocci script

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Message-ID: <CA+r1ZhiNx+3n_u+TR==fM8jwJHNr1JdH8ijayo5hW9wvam1zJg@mail.gmail.com>
Date:   Wed, 2 Sep 2020 08:23:47 -0700
From:   Jim Davis <jim.epost@...il.com>
To:     Denis Efremov <efremov@...ux.com>
Cc:     Julia Lawall <julia.lawall@...ia.fr>, cocci@...teme.lip6.fr,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [Cocci] [PATCH] coccinelle: misc: add excluded_middle.cocci script

On Wed, Sep 2, 2020 at 8:19 AM Denis Efremov <efremov@...ux.com> wrote:
>
> Check for "!A || A && B" condition. It's equivalent to
> "!A || B" condition.
>
> Signed-off-by: Denis Efremov <efremov@...ux.com>
> ---
>  scripts/coccinelle/misc/excluded_middle.cocci | 40 +++++++++++++++++++
>  1 file changed, 40 insertions(+)
>  create mode 100644 scripts/coccinelle/misc/excluded_middle.cocci
>
> diff --git a/scripts/coccinelle/misc/excluded_middle.cocci b/scripts/coccinelle/misc/excluded_middle.cocci
> new file mode 100644
> index 000000000000..1b8c20f13966
> --- /dev/null
> +++ b/scripts/coccinelle/misc/excluded_middle.cocci
> @@ -0,0 +1,40 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +///
> +/// Condition "!A || A && B" is equalent to "!A || B".

s/equalent/equivalent/

> +///
> +// Confidence: High
> +// Copyright: (C) 2020 Denis Efremov ISPRAS
> +// Options: --no-includes --include-headers
> +
> +virtual patch
> +virtual context
> +virtual org
> +virtual report
> +
> +@r depends on !patch@
> +expression A, B;
> +position p;
> +@@
> +
> +* !A || (A && B)@p
> +
> +@...ends on patch@
> +expression A, B;
> +@@
> +
> +  !A ||
> +-      (A &&
> +             B
> +-      )
> +
> +@...ipt:python depends on report@
> +p << r.p;
> +@@
> +
> +coccilib.report.print_report(p[0], "WARNING condition !A || A && B is equivalent to !A || B")
> +
> +@...ipt:python depends on org@
> +p << r.p;
> +@@
> +
> +coccilib.org.print_todo(p[0], "WARNING condition !A || A && B is equivalent to !A || B")
> --
> 2.26.2
>
> _______________________________________________
> Cocci mailing list
> Cocci@...teme.lip6.fr
> https://systeme.lip6.fr/mailman/listinfo/cocci


-- 
Jim

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