[PATCH v2 4/5] virobject: Check if @parent is the first member in class

[Michal Privoznik <mprivozn@xxxxxxxxxx>]

Our virObject code relies heavily on the fact that the first
member of the class struct is type of virObject (or some
derivation of if). Let's check for that.

Signed-off-by: Michal Privoznik <mprivozn@xxxxxxxxxx>
---
 src/util/virobject.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/util/virobject.h b/src/util/virobject.h
index 128d3ba2d2..e174c17eb8 100644
--- a/src/util/virobject.h
+++ b/src/util/virobject.h
@@ -76,10 +76,12 @@ virClassPtr virClassForObjectRWLockable(void);
 # endif
 
 # define VIR_CLASS_NEW(prnt, name) \
+    verify(offsetof(name, parent) == 0); \
     if (!(name##Class = virClassNew(prnt, #name, sizeof(name), name##Dispose))) \
         return -1;
 
 # define VIR_CLASS_NEW_GOTO(prnt, name, label) \
+    verify(offsetof(name, parent) == 0); \
     if (!(name##Class = virClassNew(prnt, #name, sizeof(name), name##Dispose))) \
         goto label;
 
-- 
2.16.1

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