lkml.org 
[lkml]   [2018]   [Aug]   [3]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH] Coccinelle: doubletest: reduce side effect false positives
Date
Ensure that the cited expression is not a function call or an
assignment to reduce the chance of false positives.

Slightly modify the warning message to indicate another source
of false positves.

Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>

---
scripts/coccinelle/tests/doubletest.cocci | 34 ++++++++++++++++++++++--------
1 file changed, 26 insertions(+), 8 deletions(-)

diff --git a/scripts/coccinelle/tests/doubletest.cocci b/scripts/coccinelle/tests/doubletest.cocci
index 78d74c2..7af2ce7 100644
--- a/scripts/coccinelle/tests/doubletest.cocci
+++ b/scripts/coccinelle/tests/doubletest.cocci
@@ -1,6 +1,7 @@
/// Find &&/|| operations that include the same argument more than once
-//# A common source of false positives is when the argument performs a side
-//# effect.
+//# A common source of false positives is when the expression, or
+//# another expresssion in the same && or || operation, performs a
+//# side effect.
///
// Confidence: Moderate
// Copyright: (C) 2010 Nicolas Palix, DIKU. GPLv2.
@@ -20,20 +21,37 @@ position p;
@@

(
-* E@p
- || ... || E
+ E@p || ... || E
|
-* E@p
- && ... && E
+ E@p && ... && E
)

-@script:python depends on org@
+@bad@
+expression r.E,e1,e2,fn;
+position r.p;
+assignment operator op;
+@@
+
+(
+E@p
+&
+ <+... \(fn(...)\|e1 op e2\|e1++\|e1--\|++e1\|--e1\) ...+>
+)
+
+@depends on context && !bad@
+expression r.E;
+position r.p;
+@@
+
+*E@p
+
+@script:python depends on org && !bad@
p << r.p;
@@

cocci.print_main("duplicated argument to && or ||",p)

-@script:python depends on report@
+@script:python depends on report && !bad@
p << r.p;
@@

\
 
 \ /
  Last update: 2018-08-03 19:07    [W:0.028 / U:0.032 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site