NDLI: Modular verification of higher-order methods with mandatory calls specified by model programs

Content Provider	ACM Digital Library
Author	Shaner, Steve M. Leavens, Gary T. Naumann, David A.
Abstract	What we call a''higher-order method" (HOM) is a method that makes mandatory calls to other dynamically-dispatched methods. Examples include template methods as in the Template method design pattern and notify methods in the Observer pattern. HOMs are particularly difficult to reason about, because standard pre- and postcondition specifications cannot describe the mandatory calls. For reasoning about such methods, existing approaches use either higher order logic or traces, but both are complex and verbose. We describe a simple, concise, and modular approach to specifying HOMs We show how to verify calls to HOMs and their code using first-order verification conditions, in asound and modular way. Verification of client code that calls HOMs can take advantage of the client's knowledge about the mandatory calls to make strong conclusions. Our verification technique validates and explains traditional documentation practice for HOMs, which typically shows their code. However, specifications do not have to expose all of the code to clients, but only enough to determine how the HOM makes its mandatory calls.
Starting Page	351
Ending Page	368
Page Count	18
File Format	PDF
ISSN	03621340 15581160
DOI	10.1145/1297105.1297053
Journal	ACM SIGPLAN Notices (SIGP)
Volume Number	42
Issue Number	10
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	1983-05-01
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Grey-box approach Refinement calculus Mandatory call Higher order method Verification Specification languages Hoare logic Model program
Content Type	Text
Resource Type	Article
Subject	Computer Graphics and Computer-Aided Design Software

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