|Author||Banerjee, Anindya ♦ Naumann, David A. ♦ Rosenberg, Stan|
|Source||ACM Digital Library|
|Publisher||Association for Computing Machinery (ACM)|
|Subject Domain (in DDC)||Computer science, information & general works ♦ Data processing & computer science|
|Subject Keyword||Modularity ♦ Data abstraction ♦ Data invariants ♦ Heap separation ♦ Information hiding ♦ Resource protection|
|Abstract||Dedicated to the memory of Stephen L. Bloom (1940--2010). Shared mutable objects pose grave challenges in reasoning, especially for information hiding and modularity. This article presents a novel technique for reasoning about error-avoiding partial correctness of programs featuring shared mutable objects, and investigates the technique by formalizing a logic. 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 frame condition specifies write, read, and allocation effects using region expressions; this supports 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, as shown here by examples. Part II of this article extends the logic with second-order framing which formalizes the hiding of data invariants.|
|Age Range||18 to 22 years ♦ above 22 year|
|Education Level||UG and PG|
|Learning Resource Type||Article|
|Publisher Place||New York|
|Journal||Journal of the ACM (JACM)|
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