SysVeritas: A Framework for Verifying IOPT Nets and Execution Semantics within Embedded Systems Design

We present a rewriting logic based technique for defining the formal executable semantics of a non-autonomous Petri net class, named Input-Output Place/Transition nets (IOPT nets), designed for model-based embedded system's development, according to the MDA initiative. For this purpose, we provide model-to-model transformations from ecore IOPT models to a rewriting logic specification in Maude. The transformations are defined as semantic mappings based on the respective metamodels: the IOPT metamodel and the Maude metamodel. Also, we define model to-text transformations for the generation of the model execution code in the rewriting logic framework. Hence, we present a translational semantics composed by two components: (i) the denotational one, considering as semantic domains the operations, equations, and properties that specify the Petri net structure, signals, and events according to the commutative monoid view; and (ii) the operational one, that changes the interleaving semantics of Maude using rewriting rules specified at the Maude metalevel to provide a maximal step semantics for transitions with arcs, test arcs, and priorities. Additionally, this work gives architectural advices in order to compose new semantics specifications by simple component substitution. Due to its simulation and verification capabilities for control systems, the presented work was applied to a domotic project that intends to save energy in residential buildings.