linux-kernel - Re: [PATCH v3] coccinelle: misc: add swap script

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Date:   Sun, 28 Mar 2021 12:19:13 +0300
From:   Denis Efremov <efremov@...ux.com>
To:     Julia Lawall <julia.lawall@...ia.fr>
Cc:     cocci@...teme.lip6.fr, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] coccinelle: misc: add swap script

Ping?

On 3/5/21 1:09 PM, Denis Efremov wrote:
> Check for opencoded swap() implementation.
> 
> Signed-off-by: Denis Efremov <efremov@...ux.com>
> ---
> Changes in v2:
>   - additional patch rule to drop excessive {}
>   - fix indentation in patch mode by anchoring ;
> Changes in v3:
>   - Rule added for simple (without var init) swap highlighting in !patch mode
>   - "depends on patch && (rpvar || rp)" fixed
> 
>   scripts/coccinelle/misc/swap.cocci | 122 +++++++++++++++++++++++++++++
>   1 file changed, 122 insertions(+)
>   create mode 100644 scripts/coccinelle/misc/swap.cocci
> 
> diff --git a/scripts/coccinelle/misc/swap.cocci b/scripts/coccinelle/misc/swap.cocci
> new file mode 100644
> index 000000000000..c5e71b7ef7f5
> --- /dev/null
> +++ b/scripts/coccinelle/misc/swap.cocci
> @@ -0,0 +1,122 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +///
> +/// Check for opencoded swap() implementation.
> +///
> +// Confidence: High
> +// Copyright: (C) 2021 Denis Efremov ISPRAS
> +// Options: --no-includes --include-headers
> +//
> +// Keywords: swap
> +//
> +
> +virtual patch
> +virtual org
> +virtual report
> +virtual context
> +
> +@...r depends on !patch@
> +identifier tmp;
> +expression a, b;
> +type T;
> +position p;
> +@@
> +
> +(
> +* T tmp;
> +|
> +* T tmp = 0;
> +|
> +* T *tmp = NULL;
> +)
> +... when != tmp
> +* tmp = a;
> +* a = b;@p
> +* b = tmp;
> +... when != tmp
> +
> +@r depends on !patch@
> +identifier tmp;
> +expression a, b;
> +position p != rvar.p;
> +@@
> +
> +* tmp = a;
> +* a = b;@p
> +* b = tmp;
> +
> +@...ar 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
> +
> +@rp depends on patch@
> +identifier tmp;
> +expression a, b;
> +@@
> +
> +- tmp = a;
> +- a = b;
> +- b = tmp
> ++ swap(a, b)
> +  ;
> +
> +@...ends on patch && (rpvar || rp)@
> +@@
> +
> +(
> +  for (...;...;...)
> +- {
> +	swap(...);
> +- }
> +|
> +  while (...)
> +- {
> +	swap(...);
> +- }
> +|
> +  if (...)
> +- {
> +	swap(...);
> +- }
> +)
> +
> +
> +@...ipt:python depends on report@
> +p << r.p;
> +@@
> +
> +coccilib.report.print_report(p[0], "WARNING opportunity for swap()")
> +
> +@...ipt:python depends on org@
> +p << r.p;
> +@@
> +
> +coccilib.org.print_todo(p[0], "WARNING opportunity for swap()")
> +
> +@...ipt:python depends on report@
> +p << rvar.p;
> +@@
> +
> +coccilib.report.print_report(p[0], "WARNING opportunity for swap()")
> +
> +@...ipt:python depends on org@
> +p << rvar.p;
> +@@
> +
> +coccilib.org.print_todo(p[0], "WARNING opportunity for swap()")
>