The opcode impl hook design is inefficient

[mlouielu]

Current design about opcode implement hook is to hook the corresponding implement to each instruction in env->insts, which the insts is read from file.

Should it be hook on an opcode impl list, then each instruction only need to call from env->impl[opcode](...), this should be more efficient for memory usage and hooking stage.

[jserv]

We need map or associative data structure to hook instruction and validate as well.

[mlouielu]

@jserv I didn't get it. what do you mean?