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From: Denis Efremov <efremov@linux.com>
To: Julia Lawall <julia.lawall@inria.fr>
Cc: cocci@systeme.lip6.fr, linux-kernel@vger.kernel.org
Subject: [Cocci] [PATCH] coccinelle: misc: add minmax script
Date: Tue, 16 Feb 2021 19:03:26 +0300
Message-ID: <20210216160326.1341741-1-efremov@linux.com> (raw)

Check for opencoded min(), max() implementations.

Signed-off-by: Denis Efremov <efremov@linux.com>
---
 scripts/coccinelle/misc/minmax.cocci | 198 +++++++++++++++++++++++++++
 1 file changed, 198 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..9ae689bb14fb
--- /dev/null
+++ b/scripts/coccinelle/misc/minmax.cocci
@@ -0,0 +1,198 @@
+// 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(...)
+{
+	... when any
+*	(x cmp y) ?@p x : y
+	... when any
+}
+
+@rmaxif depends on !patch@
+identifier func;
+expression x, y;
+expression max_val;
+binary operator cmp = {>, >=};
+position p;
+@@
+
+func(...)
+{
+	... when any
+*	if (x cmp@p y) {
+*		max_val = x;
+*	} else {
+*		max_val = y;
+*	}
+	... when any
+}
+
+@rmin depends on !patch@
+identifier func;
+expression x, y;
+binary operator cmp = {<, <=};
+position p;
+@@
+
+func(...)
+{
+	... when any
+*	(x cmp y) ?@p x : y
+	... when any
+}
+
+@rminif depends on !patch@
+identifier func;
+expression x, y;
+expression min_val;
+binary operator cmp = {<, <=};
+position p;
+@@
+
+func(...)
+{
+	... when any
+*	if (x cmp@p y) {
+*		min_val = x;
+*	} else {
+*		min_val = y;
+*	}
+	... when any
+}
+
+@depends on patch@
+identifier func;
+expression x, y;
+binary operator cmp = {>=, >};
+@@
+
+func(...)
+{
+	... when any
+-	(x cmp y) ? x : y
++	max(x, y)
+	... when any
+}
+
+@depends on patch@
+identifier func;
+expression x, y;
+expression max_val;
+binary operator cmp = {>=, >};
+@@
+
+func(...)
+{
+	... when any
+-	if (x cmp y) {
+-		max_val = x;
+-	} else {
+-		max_val = y;
+-	}
++	max_val = max(x, y);
+	... when any
+}
+
+@depends on patch@
+identifier func;
+expression x, y;
+binary operator cmp = {<=, <};
+@@
+
+func(...)
+{
+	... when any
+-	(x cmp y) ? x : y
++	min(x, y)
+	... when any
+}
+
+@depends on patch@
+identifier func;
+expression x, y;
+expression min_val;
+binary operator cmp = {<=, <};
+@@
+
+func(...)
+{
+	... when any
+-	if (x cmp y) {
+-		min_val = x;
+-	} else {
+-		min_val = y;
+-	}
++	min_val = min(x, y);
+	... when any
+}
+
+@script:python depends on report@
+p << rmax.p;
+@@
+
+coccilib.report.print_report(p[0], "WARNING opportunity for max()")
+
+@script:python depends on org@
+p << rmax.p;
+@@
+
+coccilib.report.print_todo(p[0], "WARNING opportunity for max()")
+
+@script:python depends on report@
+p << rmaxif.p;
+@@
+
+coccilib.report.print_report(p[0], "WARNING opportunity for max()")
+
+@script:python depends on org@
+p << rmaxif.p;
+@@
+
+coccilib.report.print_todo(p[0], "WARNING opportunity for max()")
+
+@script:python depends on report@
+p << rmin.p;
+@@
+
+coccilib.report.print_report(p[0], "WARNING opportunity for min()")
+
+@script:python depends on org@
+p << rmin.p;
+@@
+
+coccilib.report.print_todo(p[0], "WARNING opportunity for min()")
+
+@script:python depends on report@
+p << rminif.p;
+@@
+
+coccilib.report.print_report(p[0], "WARNING opportunity for min()")
+
+@script:python depends on org@
+p << rminif.p;
+@@
+
+coccilib.report.print_todo(p[0], "WARNING opportunity for min()")
-- 
2.26.2

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Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-02-16 16:03 Denis Efremov [this message]
2021-02-17 21:17 ` Julia Lawall
2021-02-19  9:06 ` [Cocci] [PATCH v2 RESEND] " Denis Efremov
2021-03-06 14:08   ` Julia Lawall
2021-03-05 10:16 ` [Cocci] [PATCH v3] " Denis Efremov
2021-03-08  7:04 ` [Cocci] [PATCH v4] " Denis Efremov
2021-03-08 21:30   ` Julia Lawall
2021-03-09  6:39 ` [Cocci] [PATCH v5] " Denis Efremov
2021-03-20 21:31   ` Julia Lawall

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