Many iterators have the property that the first argument is always bound to a real list element, never NULL. False positives arise for some iterators that do not have this property, or in cases when the loop cursor is reassigned. The latter should only happen when the matched code is on the way to a loop exit (break, goto, or return).
Signed-off-by: Nicolas Palix <[email protected]> Signed-off-by: Julia Lawall <[email protected]> --- scripts/coccinelle/iterators/itnull.cocci | 58 +++++++++++++++++++++++++++++ 1 files changed, 58 insertions(+), 0 deletions(-) create mode 100644 scripts/coccinelle/iterators/itnull.cocci diff --git a/scripts/coccinelle/iterators/itnull.cocci b/scripts/coccinelle/iterators/itnull.cocci new file mode 100644 index 0000000..baa4297 --- /dev/null +++ b/scripts/coccinelle/iterators/itnull.cocci @@ -0,0 +1,58 @@ +/// Many iterators have the property that the first argument is always bound +/// to a real list element, never NULL. False positives arise for some +/// iterators that do not have this property, or in cases when the loop +/// cursor is reassigned. The latter should only happen when the matched +/// code is on the way to a loop exit (break, goto, or return). +/// +// Confidence: Moderate +// Copyright: (C) 2010 Nicolas Palix, DIKU. GPLv2. +// Copyright: (C) 2010 Julia Lawall, DIKU. GPLv2. +// Copyright: (C) 2010 Gilles Muller, INRIA/LiP6. GPLv2. +// URL: http://coccinelle.lip6.fr/ +// Comments: +// Options: -no_includes -include_headers + +virtual patch + +@@ +iterator I; +expression x,E,E1,E2; +statement S,S1,S2; +@@ + +I(x,...) { <... +( +- if (x == NULL && ...) S +| +- if (x != NULL || ...) + S +| +- (x == NULL) || + E +| +- (x != NULL) && + E +| +- (x == NULL && ...) ? E1 : + E2 +| +- (x != NULL || ...) ? + E1 +- : E2 +| +- if (x == NULL && ...) S1 else + S2 +| +- if (x != NULL || ...) + S1 +- else S2 +| ++ BAD( + x == NULL ++ ) +| ++ BAD( + x != NULL ++ ) +) + ...> } \ No newline at end of file -- 1.7.0.4 _______________________________________________ Cocci mailing list [email protected] http://lists.diku.dk/mailman/listinfo/cocci (Web access from inside DIKUs LAN only)
