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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
hw/net/virtio-net.c
View file

@ -46,7 +46,7 @@
* 'container'.
*/
#define endof(container, field) \
(offsetof(container, field) + sizeof(((container *)0)->field))
(offsetof(container, field) + sizeof_field(container, field))
typedef struct VirtIOFeature {
uint64_t flags;