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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
target/i386/kvm.c
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@ -1533,7 +1533,7 @@ static int kvm_put_fpu(X86CPU *cpu)
#define XSAVE_PKRU 672
#define XSAVE_BYTE_OFFSET(word_offset) \
((word_offset) * sizeof(((struct kvm_xsave *)0)->region[0]))
((word_offset) * sizeof_field(struct kvm_xsave, region[0]))
#define ASSERT_OFFSET(word_offset, field) \
QEMU_BUILD_BUG_ON(XSAVE_BYTE_OFFSET(word_offset) != \