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final class IncOptimizer extends AnyRef

Incremental optimizer.

An incremental optimizer optimizes a LinkingUnit in an incremental way.

It maintains state between runs to do a minimal amount of work on every run, based on detecting what parts of the program must be re-optimized, and keeping optimized results from previous runs for the rest.

A general note about use of ConcurrentHashMap[T, Unit] as concurrent sets: It would seem better to use ConcurrentHashMap.newKeySet() which is specifically designed for this purpose. However, the views alone use up 4 MB of shallow size on the test suite at the time of writing. Therefore, we give up on the convenience API and use the underlying ConcurrentHashMap directly.

A similar argument applies to usages of keySet(): It appears that the implementation holds on to the key set once it is created, resulting in unnecessary memory usage.

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  18. def update(unit: LinkingUnit, logger: Logger): List[(ClassDef, Version)]

    Update the incremental analyzer with a new run.

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