HCoop / bpt / coccinelle.git / blame
| Commit | Line | Data |
|---|---|---|
| 951c7801 C |
1 | // This detects NULL tests that can only be reached when the value is known |
| 2 | // not to be NULL | |
| 3 | // | |
| 4 | // Confidence: High | |
| 5 | // Copyright: (C) Gilles Muller, Julia Lawall, EMN, DIKU. GPLv2. | |
| 6 | // URL: http://www.emn.fr/x-info/coccinelle/rules/notnull.html | |
| 7 | // Options: | |
| 8 | ||
| 9 | virtual org,diff | |
| 10 | ||
| 11 | @r exists@ | |
| 12 | local idexpression x; | |
| 13 | expression E; | |
| 14 | position p1,p2; | |
| 15 | @@ | |
| 16 | ||
| 17 | if (x@p1 == NULL || ...) { ... when forall | |
| 18 | return ...; } | |
| 19 | ... when != \(x=E\|x--\|x++\|--x\|++x\|x-=E\|x+=E\|x|=E\|x&=E\) | |
| 20 | when != &x | |
| 21 | ( | |
| 22 | x@p2 == NULL | |
| 23 | | | |
| 24 | x@p2 != NULL | |
| 25 | ) | |
| 26 | ||
| 27 | // another path to the test that is not through p1? | |
| 28 | ||
| 29 | @s exists@ | |
| 30 | local idexpression r.x; | |
| 31 | position r.p1,r.p2; | |
| 32 | @@ | |
| 33 | ||
| 34 | ... when != x@p1 | |
| 35 | ( | |
| 36 | x@p2 == NULL | |
| 37 | | | |
| 38 | x@p2 != NULL | |
| 39 | ) | |
| 40 | ||
| 41 | // another path to the test from p1? | |
| 42 | ||
| 43 | @t exists@ | |
| 44 | local idexpression x; | |
| 45 | position r.p1,r.p2; | |
| 46 | @@ | |
| 47 | ||
| 48 | if (x@p1 == NULL || ...) { ... x@p2 ... when any | |
| 49 | return ...; } | |
| 50 | ||
| 51 | // another path to the test containing an assignment? | |
| 52 | ||
| 53 | @u exists@ | |
| 54 | local idexpression x; | |
| 55 | expression E; | |
| 56 | position r.p1,r.p2; | |
| 57 | @@ | |
| 58 | ||
| 59 | if (x@p1 == NULL || ...) { ... when forall | |
| 60 | return ...; } | |
| 61 | ... | |
| 62 | \(x=E\|x--\|x++\|--x\|++x\|x-=E\|x+=E\|x|=E\|x&=E\|&x\) | |
| 63 | ... when != x@p1 | |
| 64 | when any | |
| 65 | ( | |
| 66 | x@p2 == NULL | |
| 67 | | | |
| 68 | x@p2 != NULL | |
| 69 | ) | |
| 70 | ||
| 71 | @script:python depends on !s && !t && !u && org @ | |
| 72 | p1 << r.p1; | |
| 73 | p2 << r.p2; | |
| 74 | @@ | |
| 75 | ||
| 76 | cocci.print_main("",p2) | |
| 77 | cocci.print_secs("",p1) | |
| 78 | ||
| 79 | @depends on !s && !t && !u && diff@ | |
| 80 | position r.p1, r.p2; | |
| 81 | expression x; | |
| 82 | @@ | |
| 83 | ||
| 84 | *x@p1 | |
| 85 | ... | |
| 86 | *x@p2 |