/scripts/coccinelle/iterators/list_entry_update.cocci

 1/// list_for_each_entry uses its first argument to get from one element of
 2/// the list to the next, so it is usually not a good idea to reassign it.
 3/// The first rule finds such a reassignment and the second rule checks
 4/// that there is a path from the reassignment back to the top of the loop.
 5///
 6// Confidence: High
 7// Copyright: (C) 2010 Nicolas Palix, DIKU.  GPLv2.
 8// Copyright: (C) 2010 Julia Lawall, DIKU.  GPLv2.
 9// Copyright: (C) 2010 Gilles Muller, INRIA/LiP6.  GPLv2.
10// URL: http://coccinelle.lip6.fr/
11// Comments:
12// Options: --no-includes --include-headers
13
14virtual context
15virtual org
16virtual report
17
18@r@
19iterator name list_for_each_entry;
20expression x,E;
21position p1,p2;
22@@
23
24list_for_each_entry@p1(x,...) { <... x =@p2 E ...> }
25
26@depends on context && !org && !report@
27expression x,E;
28position r.p1,r.p2;
29statement S;
30@@
31
32*x =@p2 E
33...
34list_for_each_entry@p1(x,...) S
35
36// ------------------------------------------------------------------------
37
38@back depends on (org || report) && !context exists@
39expression x,E;
40position r.p1,r.p2;
41statement S;
42@@
43
44x =@p2 E
45...
46list_for_each_entry@p1(x,...) S
47
48@script:python depends on back && org@
49p1 << r.p1;
50p2 << r.p2;
51@@
52
53cocci.print_main("iterator",p1)
54cocci.print_secs("update",p2)
55
56@script:python depends on back && report@
57p1 << r.p1;
58p2 << r.p2;
59@@
60
61msg = "iterator with update on line %s" % (p2[0].line)
62coccilib.report.print_report(p1[0],msg)