[Tarantool-patches] [PATCH small 1/1] region: new region_alloc_array, updated alloc_object

[Timur Safin]

LGTM

: -----Original Message-----
: From: Vladislav Shpilevoy <v.shpilevoy at tarantool.org>
: Sent: Thursday, June 4, 2020 12:27 AM
: To: tarantool-patches at dev.tarantool.org; alyapunov at tarantool.org;
: tsafin at tarantool.org
: Subject: Re: [Tarantool-patches] [PATCH small 1/1] region: new
: region_alloc_array, updated alloc_object
: 
: Still need 2 reviews here.
: 
: On 21/05/2020 22:32, Vladislav Shpilevoy wrote:
: > Region's API provided a macro for aligned allocation of an object:
: > region_alloc_object(). But not less frequent there is a case when
: > need to allocate an array of objects, also aligned. The patch adds
: > region_alloc_array() for that.
: >
: > Also the patch adds an out parameter 'size' for both macros. It
: > simplifies total size calculation, which is needed almost always,
: > because total size is included into an error message, if the
: > allocation fails.
: >
: > Needed for https://github.com/tarantool/tarantool/issues/4609
: > ---
: > Branch:
: http://github.com/tarantool/small/tree/gerold103/region_alloc_array
: > Issue: https://github.com/tarantool/tarantool/issues/4609
: >
: >  small/region.h | 15 ++++++++++-----
: >  1 file changed, 10 insertions(+), 5 deletions(-)
: >
: > diff --git a/small/region.h b/small/region.h
: > index bea88c6..df6567d 100644
: > --- a/small/region.h
: > +++ b/small/region.h
: > @@ -386,10 +386,15 @@ struct RegionGuard {
: >  };
: >  #endif /* __cplusplus */
: >
: > -#define region_reserve_object(region, T) \
: > -	(T *)region_aligned_reserve((region), sizeof(T), alignof(T))
: > -
: > -#define region_alloc_object(region, T) \
: > -	(T *)region_aligned_alloc((region), sizeof(T), alignof(T))
: > +#define region_alloc_object(region, T, size) ({
: 	\
: > +	*(size) = sizeof(T);							\
: > +	(T *)region_aligned_alloc((region), sizeof(T), alignof(T));
: 	\
: > +})
: > +
: > +#define region_alloc_array(region, T, count, size) ({
: 	\
: > +	int _tmp_ = sizeof(T) * (count);					\
: > +	*(size) = _tmp_;							\
: > +	(T *)region_aligned_alloc((region), _tmp_, alignof(T));
: 	\
: > +})
: >
: >  #endif /* INCLUDES_TARANTOOL_SMALL_REGION_H */
: >