Abstract
This paper aims at improving symbolic model checking for explicit state modeling languages, e.g., Promela, Dve and mCRL2. The modular Pins architecture of LTSmin supports a notion of event locality, by merely indicating for each event on which variables it depends. However, one could distinguish four separate dependencies: read, may-write, must-write and copy. In this paper, we introduce these notions in a language-independent manner. In particular, models with arrays need to distinguish overwriting and copying of values.
We also adapt the symbolic model checking algorithms to exploit the refined dependency information. We have implemented refined dependency matrices for Promela, Dve and mCRL2, in order to compare our new algorithms to the original version of LTSmin. The results show that the amount of successor computations and memory footprint are greatly reduced. Finally, the optimal variable ordering is also affected by the refined dependencies: We determined experimentally that variables with a read dependency should occur at a higher BDD level than variables with a write dependency.
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Meijer, J., Kant, G., Blom, S., van de Pol, J. (2014). Read, Write and Copy Dependencies for Symbolic Model Checking. In: Yahav, E. (eds) Hardware and Software: Verification and Testing. HVC 2014. Lecture Notes in Computer Science, vol 8855. Springer, Cham. https://doi.org/10.1007/978-3-319-13338-6_16
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DOI: https://doi.org/10.1007/978-3-319-13338-6_16
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