linux-kernel - Re: [PATCH v5] coccinelle: misc: add minmax script

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Message-ID: <alpine.DEB.2.22.394.2103202231080.3075@hadrien>
Date:   Sat, 20 Mar 2021 22:31:21 +0100 (CET)
From:   Julia Lawall <julia.lawall@...ia.fr>
To:     Denis Efremov <efremov@...ux.com>
cc:     cocci@...teme.lip6.fr, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5] coccinelle: misc: add minmax script



On Tue, 9 Mar 2021, Denis Efremov wrote:

> Check for opencoded min(), max() implementations.
>
> Signed-off-by: Denis Efremov <efremov@...ux.com>

Applied, thanks.

julia

> ---
> Changes in v2:
>  - <... ...> instead of ... when any
>  - org mode reports fixed
>  - patch rule to drop excessive ()
> Changes in v3:
>  - "depends on patch && (pmax || pmaxif || pmin || pminif)" fixed
> Changes in v4:
>  - refarmatting rule removed
>  - () brackets added to the patch rules to omit excessive ones
>  - org/report prints changed to cycle (for p0 in p: ...)
> Changes in v5:
>  - parentheses droppped in pminif and pmaxif rules (max_val = x ...)
>
>  scripts/coccinelle/misc/minmax.cocci | 206 +++++++++++++++++++++++++++
>  1 file changed, 206 insertions(+)
>  create mode 100644 scripts/coccinelle/misc/minmax.cocci
>
> diff --git a/scripts/coccinelle/misc/minmax.cocci b/scripts/coccinelle/misc/minmax.cocci
> new file mode 100644
> index 000000000000..eccdd3eb3452
> --- /dev/null
> +++ b/scripts/coccinelle/misc/minmax.cocci
> @@ -0,0 +1,206 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +///
> +/// Check for opencoded min(), max() implementations.
> +/// Generated patches sometimes require adding a cast to fix compile warning.
> +/// Warnings/patches scope intentionally limited to a function body.
> +///
> +// Confidence: Medium
> +// Copyright: (C) 2021 Denis Efremov ISPRAS
> +// Options: --no-includes --include-headers
> +//
> +// Keywords: min, max
> +//
> +
> +
> +virtual report
> +virtual org
> +virtual context
> +virtual patch
> +
> +@...x depends on !patch@
> +identifier func;
> +expression x, y;
> +binary operator cmp = {>, >=};
> +position p;
> +@@
> +
> +func(...)
> +{
> +	<...
> +*	((x) cmp@p (y) ? (x) : (y))
> +	...>
> +}
> +
> +@...xif depends on !patch@
> +identifier func;
> +expression x, y;
> +expression max_val;
> +binary operator cmp = {>, >=};
> +position p;
> +@@
> +
> +func(...)
> +{
> +	<...
> +*	if ((x) cmp@p (y)) {
> +*		max_val = (x);
> +*	} else {
> +*		max_val = (y);
> +*	}
> +	...>
> +}
> +
> +@...n depends on !patch@
> +identifier func;
> +expression x, y;
> +binary operator cmp = {<, <=};
> +position p;
> +@@
> +
> +func(...)
> +{
> +	<...
> +*	((x) cmp@p (y) ? (x) : (y))
> +	...>
> +}
> +
> +@...nif depends on !patch@
> +identifier func;
> +expression x, y;
> +expression min_val;
> +binary operator cmp = {<, <=};
> +position p;
> +@@
> +
> +func(...)
> +{
> +	<...
> +*	if ((x) cmp@p (y)) {
> +*		min_val = (x);
> +*	} else {
> +*		min_val = (y);
> +*	}
> +	...>
> +}
> +
> +@...x depends on patch@
> +identifier func;
> +expression x, y;
> +binary operator cmp = {>=, >};
> +@@
> +
> +func(...)
> +{
> +	<...
> +-	((x) cmp (y) ? (x) : (y))
> ++	max(x, y)
> +	...>
> +}
> +
> +@...xif depends on patch@
> +identifier func;
> +expression x, y;
> +expression max_val;
> +binary operator cmp = {>=, >};
> +@@
> +
> +func(...)
> +{
> +	<...
> +-	if ((x) cmp (y)) {
> +-		max_val = x;
> +-	} else {
> +-		max_val = y;
> +-	}
> ++	max_val = max(x, y);
> +	...>
> +}
> +
> +@...n depends on patch@
> +identifier func;
> +expression x, y;
> +binary operator cmp = {<=, <};
> +@@
> +
> +func(...)
> +{
> +	<...
> +-	((x) cmp (y) ? (x) : (y))
> ++	min(x, y)
> +	...>
> +}
> +
> +@...nif depends on patch@
> +identifier func;
> +expression x, y;
> +expression min_val;
> +binary operator cmp = {<=, <};
> +@@
> +
> +func(...)
> +{
> +	<...
> +-	if ((x) cmp (y)) {
> +-		min_val = x;
> +-	} else {
> +-		min_val = y;
> +-	}
> ++	min_val = min(x, y);
> +	...>
> +}
> +
> +@...ipt:python depends on report@
> +p << rmax.p;
> +@@
> +
> +for p0 in p:
> +	coccilib.report.print_report(p0, "WARNING opportunity for max()")
> +
> +@...ipt:python depends on org@
> +p << rmax.p;
> +@@
> +
> +for p0 in p:
> +	coccilib.org.print_todo(p0, "WARNING opportunity for max()")
> +
> +@...ipt:python depends on report@
> +p << rmaxif.p;
> +@@
> +
> +for p0 in p:
> +	coccilib.report.print_report(p0, "WARNING opportunity for max()")
> +
> +@...ipt:python depends on org@
> +p << rmaxif.p;
> +@@
> +
> +for p0 in p:
> +	coccilib.org.print_todo(p0, "WARNING opportunity for max()")
> +
> +@...ipt:python depends on report@
> +p << rmin.p;
> +@@
> +
> +for p0 in p:
> +	coccilib.report.print_report(p0, "WARNING opportunity for min()")
> +
> +@...ipt:python depends on org@
> +p << rmin.p;
> +@@
> +
> +for p0 in p:
> +	coccilib.org.print_todo(p0, "WARNING opportunity for min()")
> +
> +@...ipt:python depends on report@
> +p << rminif.p;
> +@@
> +
> +for p0 in p:
> +	coccilib.report.print_report(p0, "WARNING opportunity for min()")
> +
> +@...ipt:python depends on org@
> +p << rminif.p;
> +@@
> +
> +for p0 in p:
> +	coccilib.org.print_todo(p0, "WARNING opportunity for min()")
> --
> 2.26.2
>
>