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Temporal logic query checking: a tool for model exploration

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3 Author(s)
Gurfinkel, A. ; Dept. of Comput. Sci., Toronto Univ., Ont., Canada ; Chechik, M. ; Devereux, B.

Temporal logic query checking was first introduced by W. Chan in order to speed up design understanding by discovering properties not known a priori. A query is a temporal logic formula containing a special symbol ?1, known as a placeholder. Given a Kripke structure and a propositional formula φ, we say that φ satisfies the query if replacing the placeholder by φ results in a temporal logic formula satisfied by the Kripke structure. A solution to a temporal logic query on a Kripke structure is the set of all propositional formulas that satisfy the query. Query checking helps discover temporal properties of a system and, as such, is a useful tool for model exploration. In this paper, we show that query checking is applicable to a variety of model exploration tasks, ranging from invariant computation to test case generation. We illustrate these using a Cruise Control System. Additionally, we show that query checking is an instance of a multi-valued model checking of Chechik et al. This approach enables us to build an implementation of a temporal logic query checker, TLQSolver, on top of our existing multi-valued model checker χChek. It also allows us to decide a large class of queries and introduce witnesses for temporal logic queries-an essential notion for effective model exploration.

Published in:

Software Engineering, IEEE Transactions on  (Volume:29 ,  Issue: 10 )

Date of Publication:

Oct. 2003

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