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

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Date:   Sun, 4 Apr 2021 14:33:58 +0200 (CEST)
From:   Julia Lawall <julia.lawall@...ia.fr>
To:     Denis Efremov <efremov@...ux.com>
cc:     Julia Lawall <julia.lawall@...ia.fr>, cocci@...teme.lip6.fr,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] coccinelle: misc: add swap script



On Sun, 28 Mar 2021, Denis Efremov wrote:

> Ping?

Applied.  Thanks.

>
> 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()")
> >
>