118 struct btstack {  struct
124 #define BT_CLR(btstack)\  argument
125 	(btstack)->top = (btstack)->stack
127 #define BT_STACK_FULL(btstack)\  argument
128 	( (btstack)->top == &((btstack)->stack[MAXTREEHEIGHT-1]))
138 #define BT_POP(btstack)\  argument
139 	( (btstack)->top == (btstack)->stack ? NULL : --(btstack)->top )
141 #define BT_STACK(btstack)\  argument
142 	( (btstack)->top == (btstack)->stack ? NULL : (btstack)->top )
144 static inline void BT_STACK_DUMP(struct btstack *btstack)  in BT_STACK_DUMP()  argument
150 		       (long long)btstack->stack[i].bn,  in BT_STACK_DUMP()
151 		       btstack->stack[i].index);  in BT_STACK_DUMP()