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// this detects NULL tests that can only be reached when the value is known
// not to be NULL
//
// Confidence: High
// Copyright: (C) Gilles Muller, Julia Lawall, EMN, INRIA, DIKU. GPLv2.
// URL: https://coccinelle.gitlabpages.inria.fr/website/rules/notnull.html
// Options:
@r exists@
local idexpression x;
expression E;
position p1,p2;
@@
if (x@p1 == NULL || ...) { ... when forall
return ...; }
... when != \(x=E\|x--\|x++\|--x\|++x\|x-=E\|x+=E\|x|=E\|x&=E\)
when != &x
(
x@p2 == NULL
|
x@p2 != NULL
)
// another path to the test that is not through p1?
@s exists@
local idexpression r.x;
position r.p1,r.p2;
@@
... when != x@p1
(
x@p2 == NULL
|
x@p2 != NULL
)
// another path to the test from p1?
@t exists@
local idexpression x;
position r.p1,r.p2;
@@
if (x@p1 == NULL || ...) { ... x@p2 ... when any
return ...; }
// another path to the test containing an assignment?
@u exists@
local idexpression x;
expression E;
position r.p1,r.p2;
@@
if (x@p1 == NULL || ...) { ... when forall
return ...; }
...
\(x=E\|x--\|x++\|--x\|++x\|x-=E\|x+=E\|x|=E\|x&=E\|&x\)
... when != x@p1
when any
(
x@p2 == NULL
|
x@p2 != NULL
)
@fix depends on !s && !t && !u@
position r.p2;
expression x,E;
statement S1,S2;
@@
(
- if ((x@p2 != NULL) || ...)
S1
|
- if ((x@p2 != NULL) || ...)
S1
- else S2
|
- (x@p2 != NULL) && E
+ E
|
- (x@p2 == NULL) || E
+ E
|
- if ((x@p2 == NULL) && ...) S1
|
- if ((x@p2 == NULL) && ...) S1 else
S2
|
- BUG_ON(x@p2 == NULL);
)
@script:python depends on !s && !t && !u && !fix@
p1 << r.p1;
p2 << r.p2;
@@
cocci.print_main("",p1)
cocci.print_secs("retest",p2)