105 struct btstack {  struct
111 #define BT_CLR(btstack)\  argument
112 	(btstack)->top = (btstack)->stack
114 #define BT_STACK_FULL(btstack)\  argument
115 	( (btstack)->top == &((btstack)->stack[MAXTREEHEIGHT-1]))
125 #define BT_POP(btstack)\  argument
126 	( (btstack)->top == (btstack)->stack ? NULL : --(btstack)->top )
128 #define BT_STACK(btstack)\  argument
129 	( (btstack)->top == (btstack)->stack ? NULL : (btstack)->top )
131 static inline void BT_STACK_DUMP(struct btstack *btstack)  in BT_STACK_DUMP()  argument
137 		       (long long)btstack->stack[i].bn,  in BT_STACK_DUMP()
138 		       btstack->stack[i].index);  in BT_STACK_DUMP()