Memory Management & Program Analysis

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Abstractions about object finalization, weak and phantom references, synchronization semaphores, and static analysis of heap shape.

5 abstractions in this family — domain-specific abstractions that sit near one another in structural-signature space (k-means over structural-signature embeddings). Each is shown with its short description.

• Finalizer — A runtime-invoked callback associated with an object that may perform cleanup after the object becomes unreachable and before or during reclamation.
• Phantom reference — A Java reference object that becomes enqueued after its referent is finalized or otherwise unreachable and before the associated memory is reclaimed.
• Semaphore (programming) — A concurrency synchronization object maintaining a nonnegative permit count with atomic wait and signal operations that block or release execution according to resource availability.
• Shape analysis (program analysis) — A static-analysis family that infers the possible topology, sharing and reachability of dynamically allocated heap structures across program executions.
• Weak reference — A managed reference that can locate an object while not preventing a garbage collector from reclaiming that object when no sufficiently strong reachability path remains.