Prevent C compiler undefined-behavior optimization.

diff --git a/src/lj_obj.h b/src/lj_obj.h
index 3e506bdb9bba8f591e70a6134847231378c27ce1..ea8fe8701e18895b83ed34448ded1ed3c0c7434e 100644 (file)
--- a/src/lj_obj.h
+++ b/src/lj_obj.h
@@ -420,7 +420,7 @@ typedef struct GCtab {
 } GCtab;
 
 #define sizetabcolo(n) ((n)*sizeof(TValue) + sizeof(GCtab))
-#define tabref(r)      (&gcref((r))->tab)
+#define tabref(r)      ((GCtab *)gcref((r)))
 #define noderef(r)     (mref((r), Node))
 #define nextnode(n)    (mref((n)->next, Node))