Design of the LOTOSPHERE Symbolic LOTOS Simulator

Abstract

In this paper we give a brief status report on the new LOTOS simulator that is being developed in the ESPRIT LOTOSPHERE project. We discuss its functionality, first experiments with its use, and some discussion of the tool architecture and tool technology related to it. It should be noted that this tool is preliminary and not yet distributed. 1 Introduction The symbolic simulator SMILE is a tool for the exploration of the behaviour of full LOTOS IS8807 specifications. It has a number of features to distinguish itself from its predecessor HIPPO[vE89]. It is fully symbolic, it does better condition solving and it runs faster (4-8 times) in less space. 2 Basic Model SMILE is fully symbolic, which means that the behaviour that follows a certain event can be studied without instantiating the variables of the event. This makes it possible to study a symbolic trace, and observe e.g. that an event with a certain value is eventually followed by another event with that value, regardless of th..