On Fri, 9 Aug 2013, Rasmus Villemoes wrote:
> This semantic patch replaces "return {0,1};" with "return
> {false,true};" in functions returning bool. There doesn't seem to be
> any false positives, but some whitespace mangling is happening, for
> example:
When you change the argument to return, you don't have to recopy the whole
thing.
return
- 0
+ false
;
In general, if it is not too inconvenient, it is better not to recopy
code. That way you are sure that the spaces and newlines will not be
touched. In this case, it looks like a bug in the pretty printer, but it
it easy to avoid it.
julia
> diff -u -p a/block/blk-throttle.c b/block/blk-throttle.c
> --- a/block/blk-throttle.c
> +++ b/block/blk-throttle.c
> @@ -734,9 +734,7 @@ static inline void throtl_extend_slice(s
> static bool throtl_slice_used(struct throtl_grp *tg, bool rw)
> {
> if (time_in_range(jiffies, tg->slice_start[rw], tg->slice_end[rw]))
> - return 0;
> -
> - return 1;
> + return false;return true;
> }
>
> Is there a way to prevent this, or is this the kind of thing which
> must be handled in post-processing?
>
> Signed-off-by: Rasmus Villemoes <li...@rasmusvillemoes.dk>
> ---
> scripts/coccinelle/misc/boolreturn.cocci | 51
> ++++++++++++++++++++++++++++++
> 1 file changed, 51 insertions(+)
> create mode 100644 scripts/coccinelle/misc/boolreturn.cocci
>
> diff --git a/scripts/coccinelle/misc/boolreturn.cocci
> b/scripts/coccinelle/misc/boolreturn.cocci
> new file mode 100644
> index 0000000..e6ece0d
> --- /dev/null
> +++ b/scripts/coccinelle/misc/boolreturn.cocci
> @@ -0,0 +1,51 @@
> +/// Return statements in functions returning bool should use
> +/// true/false instead of 1/0.
> +//
> +
> +virtual patch
> +virtual report
> +
> +
> +@r1 depends on patch@
> +identifier fn;
> +typedef bool;
> +symbol false;
> +symbol true;
> +@@
> +
> +bool fn ( ... )
> +{
> +...
> +(
> +- return 0;
> ++ return false;
> +|
> +- return 1;
> ++ return true;
> +)
> +...
> +}
> +
> +@r2 depends on !patch@
> +identifier fn;
> +position p;
> +@@
> +
> +bool fn ( ... )
> +{
> + ...
> +(
> +* return 0@p ;
> +|
> +* return 1@p ;
> +)
> + ...
> +}
> +
> +
> +@script:python depends on report@
> +p << r2.p;
> +fn << r2.fn;
> +@@
> +
> +coccilib.report.print_report(p[0], "WARNING: return of 0/1 in function '%s'
> with return type bool" % fn)
> --
> 1.7.9.5
>
>
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
