1// SPDX-License-Identifier: GPL-2.0-only
2/// list_for_each_entry uses its first argument to get from one element of
3/// the list to the next, so it is usually not a good idea to reassign it.
4/// The first rule finds such a reassignment and the second rule checks
5/// that there is a path from the reassignment back to the top of the loop.
6///
7// Confidence: High
8// Copyright: (C) 2010 Nicolas Palix, DIKU.
9// Copyright: (C) 2010 Julia Lawall, DIKU.
10// Copyright: (C) 2010 Gilles Muller, INRIA/LiP6.
11// URL: https://coccinelle.gitlabpages.inria.fr/website
12// Comments:
13// Options: --no-includes --include-headers
14
15virtual context
16virtual org
17virtual report
18
19@r exists@
20iterator name list_for_each_entry;
21expression x,E;
22position p1,p2;
23@@
24
25list_for_each_entry@p1(x,...) { <... x =@p2 E ...> }
26
27@depends on context && !org && !report@
28expression x,E;
29position r.p1,r.p2;
30statement S;
31@@
32
33*x =@p2 E
34...
35list_for_each_entry@p1(x,...) S
36
37// ------------------------------------------------------------------------
38
39@back depends on (org || report) && !context exists@
40expression x,E;
41position r.p1,r.p2;
42statement S;
43@@
44
45x =@p2 E
46...
47list_for_each_entry@p1(x,...) S
48
49@script:python depends on back && org@
50p1 << r.p1;
51p2 << r.p2;
52@@
53
54cocci.print_main("iterator",p1)
55cocci.print_secs("update",p2)
56
57@script:python depends on back && report@
58p1 << r.p1;
59p2 << r.p2;
60@@
61
62msg = "iterator with update on line %s" % (p2[0].line)
63coccilib.report.print_report(p1[0],msg)
64