summaryrefslogtreecommitdiffstats
path: root/scripts/coccinelle/locks/mini_lock.cocci
blob: 47f649b0ea876593353ed045657b2632f17beb72 (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
93
94
95
96
/// Find missing unlocks.  This semantic match considers the specific case
/// where the unlock is missing from an if branch, and there is a lock
/// before the if and an unlock after the if.  False positives are due to
/// cases where the if branch represents a case where the function is
/// supposed to exit with the lock held, or where there is some preceding
/// function call that releases the lock.
///
// Confidence: Moderate
// Copyright: (C) 2010-2012 Nicolas Palix.  GPLv2.
// Copyright: (C) 2010-2012 Julia Lawall, INRIA/LIP6.  GPLv2.
// Copyright: (C) 2010-2012 Gilles Muller, INRIA/LiP6.  GPLv2.
// URL: http://coccinelle.lip6.fr/
// Comments:
// Options: --no-includes --include-headers

virtual context
virtual org
virtual report

@prelocked@
position p1,p;
expression E1;
@@

(
mutex_lock@p1
|
mutex_trylock@p1
|
spin_lock@p1
|
spin_trylock@p1
|
read_lock@p1
|
read_trylock@p1
|
write_lock@p1
|
write_trylock@p1
|
read_lock_irq@p1
|
write_lock_irq@p1
|
read_lock_irqsave@p1
|
write_lock_irqsave@p1
|
spin_lock_irq@p1
|
spin_lock_irqsave@p1
) (E1@p,...);

@looped@
position r;
@@

for(...;...;...) { <+... return@r ...; ...+> }

@err exists@
expression E1;
position prelocked.p;
position up != prelocked.p1;
position r!=looped.r;
identifier lock,unlock;
@@

*lock(E1@p,...);
<+... when != E1
if (...) {
  ... when != E1
*  return@r ...;
}
...+>
*unlock@up(E1,...);

@script:python depends on org@
p << prelocked.p1;
lock << err.lock;
unlock << err.unlock;
p2 << err.r;
@@

cocci.print_main(lock,p)
cocci.print_secs(unlock,p2)

@script:python depends on report@
p << prelocked.p1;
lock << err.lock;
unlock << err.unlock;
p2 << err.r;
@@

msg = "preceding lock on line %s" % (p[0].line)
coccilib.report.print_report(p2[0],msg)
OpenPOWER on IntegriCloud