On Tue, 9 Mar 2021, Denis Efremov wrote:
> Check for opencoded min(), max() implementations.
>
> Signed-off-by: Denis Efremov <efre...@linux.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
> +
> +@rmax depends on !patch@
> +identifier func;
> +expression x, y;
> +binary operator cmp = {>, >=};
> +position p;
> +@@
> +
> +func(...)
> +{
> + <...
> +* ((x) cmp@p (y) ? (x) : (y))
> + ...>
> +}
> +
> +@rmaxif 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);
> +* }
> + ...>
> +}
> +
> +@rmin depends on !patch@
> +identifier func;
> +expression x, y;
> +binary operator cmp = {<, <=};
> +position p;
> +@@
> +
> +func(...)
> +{
> + <...
> +* ((x) cmp@p (y) ? (x) : (y))
> + ...>
> +}
> +
> +@rminif 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);
> +* }
> + ...>
> +}
> +
> +@pmax depends on patch@
> +identifier func;
> +expression x, y;
> +binary operator cmp = {>=, >};
> +@@
> +
> +func(...)
> +{
> + <...
> +- ((x) cmp (y) ? (x) : (y))
> ++ max(x, y)
> + ...>
> +}
> +
> +@pmaxif 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);
> + ...>
> +}
> +
> +@pmin depends on patch@
> +identifier func;
> +expression x, y;
> +binary operator cmp = {<=, <};
> +@@
> +
> +func(...)
> +{
> + <...
> +- ((x) cmp (y) ? (x) : (y))
> ++ min(x, y)
> + ...>
> +}
> +
> +@pminif 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);
> + ...>
> +}
> +
> +@script:python depends on report@
> +p << rmax.p;
> +@@
> +
> +for p0 in p:
> + coccilib.report.print_report(p0, "WARNING opportunity for max()")
> +
> +@script:python depends on org@
> +p << rmax.p;
> +@@
> +
> +for p0 in p:
> + coccilib.org.print_todo(p0, "WARNING opportunity for max()")
> +
> +@script:python depends on report@
> +p << rmaxif.p;
> +@@
> +
> +for p0 in p:
> + coccilib.report.print_report(p0, "WARNING opportunity for max()")
> +
> +@script:python depends on org@
> +p << rmaxif.p;
> +@@
> +
> +for p0 in p:
> + coccilib.org.print_todo(p0, "WARNING opportunity for max()")
> +
> +@script:python depends on report@
> +p << rmin.p;
> +@@
> +
> +for p0 in p:
> + coccilib.report.print_report(p0, "WARNING opportunity for min()")
> +
> +@script:python depends on org@
> +p << rmin.p;
> +@@
> +
> +for p0 in p:
> + coccilib.org.print_todo(p0, "WARNING opportunity for min()")
> +
> +@script:python depends on report@
> +p << rminif.p;
> +@@
> +
> +for p0 in p:
> + coccilib.report.print_report(p0, "WARNING opportunity for min()")
> +
> +@script:python depends on org@
> +p << rminif.p;
> +@@
> +
> +for p0 in p:
> + coccilib.org.print_todo(p0, "WARNING opportunity for min()")
> --
> 2.26.2
>
>
