Acta Informatica

, Volume 28, Issue 1, pp 7–41 | Cite as

Proof theory for exception handling in a tasking environment

  • K. Lodaya
  • R. K. Shyamasundar


In this paper, we develop a syntax-directed proof system for a fragment of Ada consisting of the essential features of tasking and exception handling. The proof system is based on a correctness formula for therobust specification of single-entry-multiple-exit structures that provides a unified framework for exception handling mechanisms in the presence of nondeterminism, concurrency and communication. The proof system uses the technique ofco-operating proofs, which was developed for proving the correctness of communicating sequential processes [AFD80] and extended to a concurrent fragment of Ada in [GD84]. We build upon the latter. The soundness and completeness are established formally in [Lod87]. The proof rules are structured so that exceptions can be used as a structured escape mechanism in accordance with the design objectives of Ada. Examples are given to show how the rules highlight the annotation required for establishing the robustness of Ada programs.


Auxiliary Variable Operational Semantic Proof System Parallel Composition Proof Theory 
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Copyright information

© Springer-Verlag 1990

Authors and Affiliations

  • K. Lodaya
    • 1
  • R. K. Shyamasundar
    • 1
    • 2
  1. 1.Computer Science GroupTata Institute of Fundamental ResearchBombayIndia
  2. 2.Department of Computer SciencePennsylvania State UniversityUniversity ParkUSA

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