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authorDenis Efremov <efremov@linux.com>2020-09-21 18:28:50 +0300
committerJulia Lawall <Julia.Lawall@lip6.fr>2020-09-21 20:45:46 +0300
commitb76f0ea013125358d1b4ca147a6f9b6883dd2493 (patch)
tree0cc7e0f356310061ee86d6de2e5723fe87bdd30f /scripts/coccinelle
parenta19d1358345e040af9164ee7dd0f39ea0a99d565 (diff)
downloadlinux-b76f0ea013125358d1b4ca147a6f9b6883dd2493.tar.xz
coccinelle: misc: add excluded_middle.cocci script
Check for !A || A && B condition. It's equivalent to !A || B. Signed-off-by: Denis Efremov <efremov@linux.com> Signed-off-by: Julia Lawall <Julia.Lawall@inria.fr>
Diffstat (limited to 'scripts/coccinelle')
-rw-r--r--scripts/coccinelle/misc/excluded_middle.cocci39
1 files changed, 39 insertions, 0 deletions
diff --git a/scripts/coccinelle/misc/excluded_middle.cocci b/scripts/coccinelle/misc/excluded_middle.cocci
new file mode 100644
index 000000000000..ab28393e4843
--- /dev/null
+++ b/scripts/coccinelle/misc/excluded_middle.cocci
@@ -0,0 +1,39 @@
+// SPDX-License-Identifier: GPL-2.0-only
+///
+/// Condition !A || A && B is equivalent to !A || B.
+///
+// Confidence: High
+// Copyright: (C) 2020 Denis Efremov ISPRAS
+// Options: --no-includes --include-headers
+
+virtual patch
+virtual context
+virtual org
+virtual report
+
+@r depends on !patch@
+expression A, B;
+position p;
+@@
+
+* !A || (A &&@p B)
+
+@depends on patch@
+expression A, B;
+@@
+
+ !A ||
+- (A && B)
++ B
+
+@script:python depends on report@
+p << r.p;
+@@
+
+coccilib.report.print_report(p[0], "WARNING !A || A && B is equivalent to !A || B")
+
+@script:python depends on org@
+p << r.p;
+@@
+
+coccilib.org.print_todo(p[0], "WARNING !A || A && B is equivalent to !A || B")