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Reachability analysis is an important and well-known tool for static analysis of critical properties in concurrent programs, such as freedom from deadlocks. Direct application of traditional reachability analysis to concurrent object-oriented programs has many problems, such as incomplete analysis for reusable classes (not safe) and increased computational complexity (not efficient). Apportioning is a technique that overcomes these limitations and enables safe and efficient reachability analysis of concurrent object-oriented programs. Apportioning is based upon a simple but powerful idea of classification of program analysis points as local (having influence within a class) and global (having possible influence outside a class).
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