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| author | Stefan Hajnoczi <stefanha@redhat.com> | 2018-06-14 17:44:31 +0100 |
|---|---|---|
| committer | Stefan Hajnoczi <stefanha@redhat.com> | 2018-06-27 13:01:40 +0100 |
| commit | f18793b096e69c7acfce66cded483ba9fc01762a (patch) | |
| tree | e7cd11a399bfd2f38f81d3c60a010b6a060927d4 /include/qemu/compiler.h | |
| parent | 00928a421d47f49691cace1207481b7aad31b1f1 (diff) | |
| download | qemu-f18793b096e69c7acfce66cded483ba9fc01762a.zip qemu-f18793b096e69c7acfce66cded483ba9fc01762a.tar.gz qemu-f18793b096e69c7acfce66cded483ba9fc01762a.tar.bz2 | |
compiler: add a sizeof_field() macro
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>
Diffstat (limited to 'include/qemu/compiler.h')
| -rw-r--r-- | include/qemu/compiler.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/qemu/compiler.h b/include/qemu/compiler.h index 9f76269..5843812 100644 --- a/include/qemu/compiler.h +++ b/include/qemu/compiler.h @@ -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__ ( { \ |