I think the main issue here is what to compare the metatable with,
that is, how to specify which metatable we want. Your suggestion of
I have an idea .
Maybe we can use an indirect structure to reference the metatable rather than a direct pointer to it.
For example,
struct metatable_cache {
struct Table *metatable;
GCObject *metamethod[TM_N];
struct metatable_cache *next;
};
When we set metatable, we can copy all the metamethods into this cache structure.
If we need access the metamethods , we can check the flags of metatable first to decide whether need to sync the metamethods again.
All the table used as a metatable should have a unique cache object. We can implement this like short string table.
And then , we can put the name or anything else to this structure to check it.
