> On Jun 4, 2022, at 3:33 AM, fo...@univ-mlv.fr wrote: > > there is a lot of libraries that have APIs using interfaces that are > implemented by anonymous classes, the collection API is one of them, fluent > loggers (anything fluent in fact) is another, and those will benefit to have > better than escape analysis performance.
This could use validation. My very high-level sense is that within inlined code, escape analysis will do just fine with identity classes, with no observable performance gain when switching to a value class. *Across calls*, we can do much better with value classes, but at that point current HotSpot optimizations need a name in the descriptor. (Huge caveat that my understanding of this situation is very high-level, and there may be important things I'm missing.) Also note that if it's necessary to opt in anyway, it's not particularly much to ask these performance-sensitive users to declare a local class rather than an anonymous value class.
