Integration of Formal Verification and Debugging Methods in P-GRADE Environment

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In this paper we present a combined method, which enables the collaboration of parallel debugging techniques with simulation and verification of parallel program’s coloured Petri-net model in the frame of an integrated development environment. For parallel applications, written in the hybrid graphical language of P-GRADE, the coloured Petri-net model can be automatically generated. The Occurrence Graph (a kind of state-space) is constructed straight away from the model by the GRSIM simulation engine, which allows examining and querying the Occurrence Graph for critical information, such as dead-locks, wrong termination, or the meeting the temporal logic specification. Based on the obtained information the macrostep-based execution can be steered towards the erroneous situations assisting to users to improve the quality of their software.