1558 struct stack_block {  struct
1559 	struct stack_block *prev;  argument
1564 	struct stack_block *stackp;  argument
1571 	struct stack_block *g_stackp; // = &stackbase;
1575 	struct stack_block stackbase;
1614 		struct stack_block *sp;  in stalloc()
1619 		len = sizeof(struct stack_block) - MINSIZE + blocksize;  in stalloc()
1690 	struct stack_block *sp;  in popstackmark()
1729 		struct stack_block *sp;  in growstackblock()
1730 		struct stack_block *prevstackp;  in growstackblock()
1736 		grosslen = newlen + sizeof(struct stack_block) - MINSIZE;  in growstackblock()