ref: a66be92f63ec59c1811403eb7b95fa72588beee6
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));