Coccinelle: Add iterators/itnull.cocci

[pandora-kernel.git] / scripts / coccinelle / iterators / itnull.cocci

diff --git a/scripts/coccinelle/iterators/itnull.cocci b/scripts/coccinelle/iterators/itnull.cocci
new file mode 100644 (file)
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