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Hossein Hojjat

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The Homeostasis Protocol: Avoiding Transaction Coordination Through Program Analysis

Christoph Koch, Hossein Hojjat

Datastores today rely on distribution and replication to achieve improved performance and fault-tolerance. But correctness of many applications depends on strong consistency properties—something that can impose substantial overheads, since it requires coor ...

ACM Press2015

On recursion-free Horn clauses and Craig interpolation

Viktor Kuncak, Hossein Hojjat

One of the main challenges in software verification is efficient and precise analysis of programs with procedures and loops. Interpolation methods remain among the most promising techniques for such verification. To accommodate the demands of various progr ...

Springer2015

Uniform Analysis for Communicating Timed Systems (Extended Technical Report)

Hossein Hojjat

Languages based on the theory of timed automata are a well established approach for modelling and analysing real-time systems, with many applications both in an industrial and academic context. Model checking for timed automata has been studied extensively ...

2013

On Accelerating Interpolants

Viktor Kuncak, Hossein Hojjat

We present Counterexample-Guided Accelerated Abstraction Refinement (CEGAAR), a new algorithm for verifying infinite-state transition systems. CEGAAR combines interpolation-based predicate discovery in counterexample guided predicate abstraction with accel ...

2012

Accelerating Interpolants

Viktor Kuncak, Hossein Hojjat

2012

A Verification Toolkit for Numerical Transition Systems

Viktor Kuncak, Hossein Hojjat

This paper presents a publicly available toolkit and a benchmark suite for rigorous verification of Integer Numerical Transition Systems (INTS), which can be viewed as control-flow graphs whose edges are annotated by Presburger arithmetic formulas. We pres ...

2012

Symbolic execution of Reo circuits using constraint automata

Hossein Hojjat

Reo is a coordination language that can be used to model different systems. We propose a technique for symbolic execution of Reo circuits using the symbolic representation of data constraints in Constraint Automata. This technique enables us to obtain the ...

2012

Formal Analysis of SystemC Designs in Process Algebra

Hossein Hojjat

SystemC is an IEEE standard system-level language used in hardware/software co-design and has been widely adopted in the industry. This paper describes a formal approach to verifying SystemC designs by providing a mapping to the process algebra mCRL2. Our ...

2011