By Armin Biere (auth.), Kerstin Eder, João Lourenço, Onn Shehory (eds.)
This e-book constitutes the completely refereed post-conference complaints of the seventh overseas Haifa Verification convention, HVC 2011, held in Haifa, Israel in December 2011.
The 15 revised complete papers provided including three device papers and four posters have been rigorously reviewed and chosen from forty three submissions. The papers are geared up in topical sections on synthesis, formal verification, software program caliber, trying out and assurance, event and instruments, and posters- scholar event.
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Extra info for Hardware and Software: Verification and Testing: 7th International Haifa Verification Conference, HVC 2011, Haifa, Israel, December 6-8, 2011, Revised Selected Papers
Example text
Given a timed sequence ω of the form v0 δ0 (φ0 ,ψ0 ) −→ σ0 v1 δ1 (φ1 ,ψ1 ) (φn−1 ,ψn−1 ) σ1 σn−1 −→ . . −→ vn , let ζi (x) represents the value of x (x ∈ X) when δn the automaton has stayed at vi for delay δi along with ω (0 ≤ i ≤ n), and λi (x) represents the value of x at the time the automaton reaches vi along with ω. It follows that λ0 (x) = a d if x := d ∈ ψi (0 ≤ i < n). if x = a ∈ γ(v0 ), and λi+1 (x) = ζi (x) otherwise Definition 2. For an LHA H = (X, Σ, V, V 0, E, α, β, γ), a timed sequence of the form v0 δ0 (φ0 ,ψ0 ) −→ σ0 v1 δ1 (φ1 ,ψ1 ) (φn−1 ,ψn−1 ) σ1 σn−1 −→ .
As ζv3 (x) < 5, ζv3 (x) > 3, and ζv3 (x) − 1 = 2δv3 , we can get 1 < δv3 < 2. Because ζv3 (y) − 1 = δv3 , we can get 2 < ζv3 (y) < 3, which contradicts with ζv3 (y) > 4. As these constraints are generated according to the invariants and guards from transition e2 , e3 , and location v3 , v4 , this implies the path segment v2 −→ e2 v3 −→ v4 is infeasible, but v2 −→ v3 is an feasible one. Therefore, if the DFS e3 e2 algorithm is clever enough, it will backtrack to the location v3 and traverse the next branch v3 −→ v1 .
Both symbolic model checking and bounded model checking are facing the complete state space or the partly complete space under the threshold at one time which is always too large and complex for the solver to handle. In order to control the complexity of the verification of LHA, we proposed a linear programming (LP) based approach[8] to develop an efficient path-oriented reachability checker to check one abstract path in the graph structure of a LHA at a time to find whether there exists a behavior of the LHA along this abstract path and satisfy the given reachability specification.