ref: 10954ee4177af81e1892b833d8b33140629f68a4
dir: /ops.h/
typedef struct Frame Frame; struct Frame { u32int *pc; Frame *next; }; typedef struct Op Op; struct Op { u32int opcode; void (*f)(Frame*,u32int); }; int oplookup(u32int code, void (**f)(Frame*,u32int));