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compiler: Add FIELD_SIZEOF helper

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Signed-off-by: Cyrill Gorcunov <gorcunov@gmail.com>
Reviewed-by: Dmitry Safonov <0x7f454c46@gmail.com>
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>
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Cyrill Gorcunov 2018-07-19 15:47:30 +03:00 committed by Andrei Vagin
parent bc7d57ebad
commit e319aaa0cf
1 changed files with 4 additions and 0 deletions
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4
include/common/compiler.h
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@ -57,6 +57,10 @@
const typeof( ((type *)0)->member ) *__mptr = (ptr); \
(type *)( (char *)__mptr - offsetof(type,member) );})
#ifndef FIELD_SIZEOF
# define FIELD_SIZEOF(t, f) (sizeof(((t*)0)->f))
#endif
#define __round_mask(x, y) ((__typeof__(x))((y) - 1))
#define round_up(x, y) ((((x) - 1) | __round_mask(x, y)) + 1)
#define round_down(x, y) ((x) & ~__round_mask(x, y))