Slava Pestov 2f33356083 AST: Optimize construction of the AnyObject dispatch table ...

Instead of visiting all members of all types and extensions, bail out
early if the type is not a class or protocol, or the extension is not
extending a class. This means we don't visit structs, enums or
protocol extensions at all, which will avoid delayed parsing.

Also, we were evaluating isObjC() on each member, which is an expensive
operation; if the member does not have an explicit @objc we would still
have to check if it overrides an @objc method or witnesses an @objc
protocol requirement.

Since most members are not ever found by dynamic lookup, this is wasted
work. Instead, let's rely on AnyObject lookup filtering non-@objc
members at the call site, which it was already doing anyway.

2019-08-12 17:55:44 -04:00

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