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// SPDX-License-Identifier: GPL-2.0-only
/// 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.
// Copyright: (C) 2010 Julia Lawall, DIKU.
// Copyright: (C) 2010 Gilles Muller, INRIA/LiP6.
// URL: https://coccinelle.gitlabpages.inria.fr/website
// Comments:
// Options: --no-includes --include-headers
virtual org
virtual report
@locked@
position p1;
expression E1;
position p;
@@
(
mutex_lock@p1
|
mutex_trylock@p1
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spin_lock@p1
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spin_trylock@p1
|
read_lock@p1
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read_trylock@p1
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write_lock@p1
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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)
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