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Author Banerjee, Anindya ♦ Naumann, David A.
Source ACM Digital Library
Content type Text
Publisher Association for Computing Machinery (ACM)
File Format PDF
Copyright Year ©2013
Language English
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 John C. Reynolds (1935--2013). The hiding of internal invariants creates a mismatch between procedure specifications in an interface and proof obligations on the implementations of those procedures. The mismatch is sound if the invariants depend only on encapsulated state, but encapsulation is problematic in contemporary software due to the many uses of shared mutable objects. The mismatch is formalized here in a proof rule that achieves flexibility via explicit restrictions on client effects, expressed using ghost state and ordinary first order assertions. The restrictions amount to a stateful frame condition that must be satisfied by any client; this dynamic encapsulation boundary complements conventional scope-based encapsulation. The technical development is based on a companion article, Part I, that presents Region Logic---a programming logic with stateful frame conditions for commands.
ISSN 00045411
Age Range 18 to 22 years ♦ above 22 year
Educational Use Research
Education Level UG and PG
Learning Resource Type Article
Publisher Date 2013-06-01
Publisher Place New York
e-ISSN 1557735X
Journal Journal of the ACM (JACM)
Volume Number 60
Issue Number 3
Page Count 73
Starting Page 1
Ending Page 73


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Source: ACM Digital Library