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[188.32.236.56]) by smtp.googlemail.com with ESMTPSA id y19sm992465lji.31.2021.02.16.08.03.25 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 16 Feb 2021 08:03:25 -0800 (PST) From: Denis Efremov To: Julia Lawall Cc: Denis Efremov , cocci@systeme.lip6.fr, linux-kernel@vger.kernel.org Subject: [PATCH] coccinelle: misc: add minmax script Date: Tue, 16 Feb 2021 19:03:26 +0300 Message-Id: <20210216160326.1341741-1-efremov@linux.com> X-Mailer: git-send-email 2.26.2 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Check for opencoded min(), max() implementations. Signed-off-by: Denis Efremov --- 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