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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 v4] coccinelle: misc: add minmax script
Date: Mon,  8 Mar 2021 10:04:45 +0300
Message-ID: <20210308070445.104768-1-efremov@linux.com> (raw)
In-Reply-To: <20210216160326.1341741-1-efremov@linux.com>

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

Signed-off-by: Denis Efremov <efremov@linux.com>
---
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: ...)

 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..63eeba1702ec
--- /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

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  parent reply index

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

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