The Architecture Analysis and Design Language (AADL) is used to represent architecture design decisions of safety-critical and real-time embedded systems. Due to the farreaching effects these decisions have on the development process, an architecture design fault is likely to have a significant deteriorating impact through the complete process. Automated fault avoidance of architecture design decisions therefore has the potential to significantly reduce the cost of the development while increasing the dependability of the end product. To provide means for automated fault avoidance when developing systems specified in AADL, a formal verification technique has been developed to ensure completeness and consistency of an AADL specification as well as its conformity with the end product. The approach requires the semantics of AADL to be formalized and implemented. We use the methodology of semantic anchoring to contribute with a formal and implemented semantics of a subset of AADL through a set of transformation rules to timed automata constructs. In addition, the verification technique, including the transformation rules, is validated using a case study of a safety-critical fuel-level system developed by a major vehicle manufacturer.

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The Architecture Analysis and Design Language (AADL) has been widely accepted to support the development process of Distributed Real-time and Embedded (DRE) systems and ease the tension of analyzing the systems' non-functional properties. The AADL standard prescribes the dispatching and scheduling semantics for the thread components in the system using natural language. The lack of formal semantics limits the possibility to perform formal verification of AADL specifications. The main contribution of this paper is a mapping from a substantial asynchronous subset of AADL into the TASM language, allowing us to perform resource consumption and schedulability analysis of AADL models. A small case study is presented as a validation of the usefulness of this work.