Component-Based Abstraction and Refinement

In this paper, we present a comprehensive approach to model check- ing component-based systems (including software, hardware, and embedded systems) through abstraction and refinement. This approach is based on assume-guarantee compositional reasoning and features two synergistic techniques: (1) an automatic algorithm to component-based abstraction and (2) a mechanized assistant for abstraction refinement. The key insight to the abstraction algorithm is that a verified property is a natural abstraction of a component. The abstraction algorithm automatically determines which component properties can be included in the abstraction for verifying a system property by determining whether the assumptions of the component properties hold in the context of the system. If the abstraction fails to establish the system property, the refinement assistant determines the causes of the failure, e.g., why a component property is not included, and provides automatic remedies or requests manual remedies. This approach has been applied in component-based hardware/software co-verification of embedded systems. Case studies have shown that this approach is very effective in abstracting component-based embedded systems and guiding abstraction refinement.

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