20 #define vla_group(groupname) size_t groupname##__next = 0  argument
21 #define vla_group_size(groupname) groupname##__next  argument
23 #define vla_item(groupname, type, name, n) \  argument
24 	size_t groupname##_##name##__offset = ({			       \
26 		if (groupname##__next != SIZE_MAX) {			       \
29 			offset = (groupname##__next + align_mask) &	       \
32 					       &groupname##__next)) {          \
33 				groupname##__next = SIZE_MAX;		       \
40 #define vla_item_with_sz(groupname, type, name, n) \  argument
41 	size_t groupname##_##name##__sz = array_size(n, sizeof(type));	        \
42 	size_t groupname##_##name##__offset = ({			        \
44 		if (groupname##__next != SIZE_MAX) {				\
46 			offset = (groupname##__next + align_mask) &		\
48 			if (check_add_overflow(offset, groupname##_##name##__sz,\
49 							&groupname##__next)) {	\
50 				groupname##__next = SIZE_MAX;			\
57 #define vla_ptr(ptr, groupname, name) \  argument
58 	((void *) ((char *)ptr + groupname##_##name##__offset))