Abstract
Shared mutable objects pose grave challenges in reasoning, especially for data abstraction and modularity. This paper presents a novel logic for error-avoiding partial correctness of programs featuring shared mutable objects. Using a first order assertion language, the logic provides heap-local reasoning about mutation and separation, via ghost fields and variables of type ‘region’ (finite sets of object references). A new form of modifies clause specifies write, read, and allocation effects using region expressions; this supports effect masking and a frame rule that allows a command to read state on which the framed predicate depends. Soundness is proved using a standard program semantics. The logic facilitates heap-local reasoning about object invariants: disciplines such as ownership are expressible but not hard-wired in the logic.
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Banerjee, A., Naumann, D.A., Rosenberg, S. (2008). Regional Logic for Local Reasoning about Global Invariants. In: Vitek, J. (eds) ECOOP 2008 – Object-Oriented Programming. ECOOP 2008. Lecture Notes in Computer Science, vol 5142. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-70592-5_17
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