summaryrefslogtreecommitdiffstats
path: root/scripts/coccinelle/locks/double_lock.cocci
blob: 63b24e682fad112188d0bdfc5b4c80d9009f0a13 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
/// Find double locks.  False positives may occur when some paths cannot
/// occur at execution, due to the values of variables, and when there is
/// an intervening function call that releases the lock.
///
// Confidence: Moderate
// Copyright: (C) 2010 Nicolas Palix, DIKU.  GPLv2.
// Copyright: (C) 2010 Julia Lawall, DIKU.  GPLv2.
// Copyright: (C) 2010 Gilles Muller, INRIA/LiP6.  GPLv2.
// URL: http://coccinelle.lip6.fr/
// Comments:
// Options: -no_includes -include_headers

virtual org
virtual report

@locked@
position p1;
expression E1;
position p;
@@

(
mutex_lock@p1
|
mutex_trylock@p1
|
spin_lock@p1
|
spin_trylock@p1
|
read_lock@p1
|
read_trylock@p1
|
write_lock@p1
|
write_trylock@p1
) (E1@p,...);

@balanced@
position p1 != locked.p1;
position locked.p;
identifier lock,unlock;
expression x <= locked.E1;
expression E,locked.E1;
expression E2;
@@

if (E) {
 <+... when != E1
 lock(E1@p,...)
 ...+>
}
... when != E1
    when != \(x = E2\|&x\)
    when forall
if (E) {
 <+... when != E1
 unlock@p1(E1,...)
 ...+>
}

@r depends on !balanced exists@
expression x <= locked.E1;
expression locked.E1;
expression E2;
identifier lock;
position locked.p,p1,p2;
@@

lock@p1 (E1@p,...);
... when != E1
    when != \(x = E2\|&x\)
lock@p2 (E1,...);

@script:python depends on org@
p1 << r.p1;
p2 << r.p2;
lock << r.lock;
@@

cocci.print_main(lock,p1)
cocci.print_secs("second lock",p2)

@script:python depends on report@
p1 << r.p1;
p2 << r.p2;
lock << r.lock;
@@

msg = "second lock on line %s" % (p2[0].line)
coccilib.report.print_report(p1[0],msg)