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 v3] coccinelle: misc: add minmax script
Date: Fri, 5 Mar 2021 13:16:40 +0300 [thread overview]
Message-ID: <20210305101640.7717-1-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
scripts/coccinelle/misc/minmax.cocci | 224 +++++++++++++++++++++++++++
1 file changed, 224 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..f577f08d1e6e
--- /dev/null
+++ b/scripts/coccinelle/misc/minmax.cocci
@@ -0,0 +1,224 @@
+// 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 = {>=, >};
+position p;
+@@
+
+func@p(...)
+{
+ <...
+- x cmp y ? x : y
++ max(x, y)
+ ...>
+}
+
+@pmaxif depends on patch@
+identifier func;
+expression x, y;
+expression max_val;
+binary operator cmp = {>=, >};
+position p;
+@@
+
+func@p(...)
+{
+ <...
+- 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 = {<=, <};
+position p;
+@@
+
+func@p(...)
+{
+ <...
+- x cmp y ? x : y
++ min(x, y)
+ ...>
+}
+
+@pminif depends on patch@
+identifier func;
+expression x, y;
+expression min_val;
+binary operator cmp = {<=, <};
+position p;
+@@
+
+func@p(...)
+{
+ <...
+- if (x cmp y) {
+- min_val = x;
+- } else {
+- min_val = y;
+- }
++ min_val = min(x, y);
+ ...>
+}
+
+@depends on patch && (pmax || pmaxif || pmin || pminif)@
+identifier func;
+expression x, y;
+position p;
+// FIXME: Coccinelle consumes all available ram and
+// and timeouts on every file.
+// position p = { pmin.p, pminif.p, pmax.p, pmaxif.p };
+@@
+
+func@p(...)
+{
+ <...
+(
+- (min((x), (y)))
++ min(x, y)
+|
+- (max((x), (y)))
++ max(x, y)
+)
+ ...>
+}
+
+@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.org.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.org.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.org.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.org.print_todo(p[0], "WARNING opportunity for min()")
--
2.26.2
_______________________________________________
Cocci mailing list
Cocci@systeme.lip6.fr
https://systeme.lip6.fr/mailman/listinfo/cocci
next prev parent reply other threads:[~2021-03-05 8:19 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-16 16:03 [Cocci] [PATCH] coccinelle: misc: add minmax script 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 ` Denis Efremov [this message]
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
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20210305101640.7717-1-efremov@linux.com \
--to=efremov@linux.com \
--cc=cocci@systeme.lip6.fr \
--cc=julia.lawall@inria.fr \
--cc=linux-kernel@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).