Optimization: Introduce CompactAnnotation #24679
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odersky
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This one takes a type argument instead of as a tree argument. For now it's reserved for retains-like annotations. CompactAnnotations don't need tree maps and annotated types containing them hash properly.
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This one takes a type argument instead of as a tree argument. This makes mapping such annotations a lot faster and also safer. In fact, in retrospect, most annotations could be represented as
CompactAnnotations.CompactAnnotationis extended byRetainingAnnotation, which is reserved for@retains,@retainsByNameand@retainsCap. We make sure that all annotations with these classes are represented asRetainingAnnotations.For now there are no
CompactAnnotations other than@RetainingAnnotations but this could be changed in the future.