240 lines
3.2 KiB
Plaintext
240 lines
3.2 KiB
Plaintext
// SPDX-License-Identifier: GPL-2.0-only
|
|
/// Compare pointer-typed values to NULL rather than 0
|
|
///
|
|
//# This makes an effort to choose between !x and x == NULL. !x is used
|
|
//# if it has previously been used with the function used to initialize x.
|
|
//# This relies on type information. More type information can be obtained
|
|
//# using the option -all_includes and the option -I to specify an
|
|
//# include path.
|
|
//
|
|
// Confidence: High
|
|
// Copyright: (C) 2012 Julia Lawall, INRIA/LIP6.
|
|
// Copyright: (C) 2012 Gilles Muller, INRIA/LiP6.
|
|
// URL: http://coccinelle.lip6.fr/
|
|
// Requires: 1.0.0
|
|
// Options:
|
|
|
|
virtual patch
|
|
virtual context
|
|
virtual org
|
|
virtual report
|
|
|
|
@initialize:ocaml@
|
|
@@
|
|
let negtable = Hashtbl.create 101
|
|
|
|
@depends on patch@
|
|
expression *E;
|
|
identifier f;
|
|
@@
|
|
|
|
(
|
|
(E = f(...)) ==
|
|
- 0
|
|
+ NULL
|
|
|
|
|
(E = f(...)) !=
|
|
- 0
|
|
+ NULL
|
|
|
|
|
- 0
|
|
+ NULL
|
|
== (E = f(...))
|
|
|
|
|
- 0
|
|
+ NULL
|
|
!= (E = f(...))
|
|
)
|
|
|
|
|
|
@t1 depends on !patch@
|
|
expression *E;
|
|
identifier f;
|
|
position p;
|
|
@@
|
|
|
|
(
|
|
(E = f(...)) ==
|
|
* 0@p
|
|
|
|
|
(E = f(...)) !=
|
|
* 0@p
|
|
|
|
|
* 0@p
|
|
== (E = f(...))
|
|
|
|
|
* 0@p
|
|
!= (E = f(...))
|
|
)
|
|
|
|
@script:python depends on org@
|
|
p << t1.p;
|
|
@@
|
|
|
|
coccilib.org.print_todo(p[0], "WARNING comparing pointer to 0")
|
|
|
|
@script:python depends on report@
|
|
p << t1.p;
|
|
@@
|
|
|
|
coccilib.report.print_report(p[0], "WARNING comparing pointer to 0")
|
|
|
|
// Tests of returned values
|
|
|
|
@s@
|
|
identifier f;
|
|
expression E,E1;
|
|
@@
|
|
|
|
E = f(...)
|
|
... when != E = E1
|
|
!E
|
|
|
|
@script:ocaml depends on s@
|
|
f << s.f;
|
|
@@
|
|
|
|
try let _ = Hashtbl.find negtable f in ()
|
|
with Not_found -> Hashtbl.add negtable f ()
|
|
|
|
@ r disable is_zero,isnt_zero exists @
|
|
expression *E;
|
|
identifier f;
|
|
@@
|
|
|
|
E = f(...)
|
|
...
|
|
(E == 0
|
|
|E != 0
|
|
|0 == E
|
|
|0 != E
|
|
)
|
|
|
|
@script:ocaml@
|
|
f << r.f;
|
|
@@
|
|
|
|
try let _ = Hashtbl.find negtable f in ()
|
|
with Not_found -> include_match false
|
|
|
|
// This rule may lead to inconsistent path problems, if E is defined in two
|
|
// places
|
|
@ depends on patch disable is_zero,isnt_zero @
|
|
expression *E;
|
|
expression E1;
|
|
identifier r.f;
|
|
@@
|
|
|
|
E = f(...)
|
|
<...
|
|
(
|
|
- E == 0
|
|
+ !E
|
|
|
|
|
- E != 0
|
|
+ E
|
|
|
|
|
- 0 == E
|
|
+ !E
|
|
|
|
|
- 0 != E
|
|
+ E
|
|
)
|
|
...>
|
|
?E = E1
|
|
|
|
@t2 depends on !patch disable is_zero,isnt_zero @
|
|
expression *E;
|
|
expression E1;
|
|
identifier r.f;
|
|
position p1;
|
|
position p2;
|
|
@@
|
|
|
|
E = f(...)
|
|
<...
|
|
(
|
|
* E == 0@p1
|
|
|
|
|
* E != 0@p2
|
|
|
|
|
* 0@p1 == E
|
|
|
|
|
* 0@p1 != E
|
|
)
|
|
...>
|
|
?E = E1
|
|
|
|
@script:python depends on org@
|
|
p << t2.p1;
|
|
@@
|
|
|
|
coccilib.org.print_todo(p[0], "WARNING comparing pointer to 0, suggest !E")
|
|
|
|
@script:python depends on org@
|
|
p << t2.p2;
|
|
@@
|
|
|
|
coccilib.org.print_todo(p[0], "WARNING comparing pointer to 0")
|
|
|
|
@script:python depends on report@
|
|
p << t2.p1;
|
|
@@
|
|
|
|
coccilib.report.print_report(p[0], "WARNING comparing pointer to 0, suggest !E")
|
|
|
|
@script:python depends on report@
|
|
p << t2.p2;
|
|
@@
|
|
|
|
coccilib.report.print_report(p[0], "WARNING comparing pointer to 0")
|
|
|
|
@ depends on patch disable is_zero,isnt_zero @
|
|
expression *E;
|
|
@@
|
|
|
|
(
|
|
E ==
|
|
- 0
|
|
+ NULL
|
|
|
|
|
E !=
|
|
- 0
|
|
+ NULL
|
|
|
|
|
- 0
|
|
+ NULL
|
|
== E
|
|
|
|
|
- 0
|
|
+ NULL
|
|
!= E
|
|
)
|
|
|
|
@ t3 depends on !patch disable is_zero,isnt_zero @
|
|
expression *E;
|
|
position p;
|
|
@@
|
|
|
|
(
|
|
* E == 0@p
|
|
|
|
|
* E != 0@p
|
|
|
|
|
* 0@p == E
|
|
|
|
|
* 0@p != E
|
|
)
|
|
|
|
@script:python depends on org@
|
|
p << t3.p;
|
|
@@
|
|
|
|
coccilib.org.print_todo(p[0], "WARNING comparing pointer to 0")
|
|
|
|
@script:python depends on report@
|
|
p << t3.p;
|
|
@@
|
|
|
|
coccilib.report.print_report(p[0], "WARNING comparing pointer to 0")
|