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compiler: add a sizeof_field() macro

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Determining the size of a field is useful when you don't have a struct
variable handy.  Open-coding this is ugly.

This patch adds the sizeof_field() macro, which is similar to
typeof_field().  Existing instances are updated to use the macro.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: John Snow <jsnow@redhat.com>
Message-id: 20180614164431.29305-1-stefanha@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Stefan Hajnoczi 2018-06-14 17:44:31 +01:00
parent 00928a421d
commit f18793b096
9 changed files with 24 additions and 22 deletions
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2
include/qemu/compiler.h
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@ -64,6 +64,8 @@
(type *) ((char *) __mptr - offsetof(type, member));})
#endif
#define sizeof_field(type, field) sizeof(((type *)0)->field)
/* Convert from a base type to a parent type, with compile time checking. */
#ifdef __GNUC__
#define DO_UPCAST(type, field, dev) ( __extension__ ( { \