Verimag

Seminar details

Room 204
4 November 2016 - 13h00
Formula Slicing: Inductive Invariants from Preconditions
by George Karpenkov from VERIMAG



Abstract: We propose a ``formula slicing'' method for finding inductive invariants.
It is based on the observation that many loops in the program
affect only a small part of the memory,
and many invariants which were valid before a loop are still valid after.

Given a precondition of the loop,
obtained from the preceding program fragment,
we weaken it until it becomes inductive.
The weakening procedure is guided by counterexamples-to-induction given by an
SMT solver.
Our algorithm applies to programs with arbitrary loop structure,
and it computes the strongest invariant in an abstract domain of weakenings of
preconditions.
We call this algorithm ``formula slicing'', as it effectively performs
``slicing'' on formulas derived from symbolic execution.

We evaluate our algorithm on the device driver benchmarks
from the International Competition on Software Verification (SV-COMP),
and we show that it is competitive with the state-of-the-art verification
techniques.

This talk is a preparation for the upcoming conference at HVC.





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