Is the result of a rule cached?

[Jens von Pilgrim]

I'm wondering whether the result of a rule, in particular of an auxiliary function, is cached? E.g., I have an auxiliary functions

auxiliary {
    superclasses(Class cl) : List<Class>
    allMembers(Class cl) : Iterable<Member>
        ...
}

which are quite expensive.

Regards,
Jens

[Lorenzo Bettini]

At the moment there's no caching mechanism... I was thinking about adding caching, based on objects' references.

However, I don't know whether this would make sense: when you write in the editor the AST model changes many times. Probably though Xtext should only rebuild the parts that really changed and the objects' identifiers should not change.

I might try to add caching in the future, and it should not be too hard to implement (but first I'd like to port Xsemantics to Xtext 2.4.2).

[Jens von Pilgrim]

Of course, updating to Xtext 2.4.2 is certainly more important.

Still: The type system is created on the fly when needed, that is, it is not a singleton, is it? So, caching information there would be similar to caching in the scope provider, wouldn't it?

As a workaround: could I use Gamma (G) as a kind of cache?

Regards,
Jens