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Flexible models for dynamic linking. (English) Zbl 1032.68039
Degano, Pierpaolo (ed.), Programming languages and systems. 12th European symposium on programming, ESOP 2003, held as part of the joint European conferences on theory and practice of software, ETAPS 2003, Warsaw, Poland, April 7-11, 2003. Proceedings. Berlin: Springer. Lect. Notes Comput. Sci. 2618, 38-53 (2003).
Summary: Dynamic linking supports flexible code deployment: partially linked code links further code on the fly, as needed; and thus, end-users receive updates automatically. On the down side, each program run may link different versions of the same code, possibly causing subtle errors which mystify end-users.
Dynamic linking in Java and C# are similar: The same linking phases are involved, soundness is based on similar ideas, and executions which do not throw linking errors give the same result. They are, however, not identical: the linking phases are combined differently, and take place in a different order.
We develop a nondeterministic model, which includes the behaviour of Java and C#. The non-determinism allows us to describe the design space, to distill the similarities between the two languages, and to use one proof of soundness for both. We also prove that all execution strategies are equivalent in the sense that all terminating executions which do not involve a link error, give the same result.
For the entire collection see [Zbl 1017.00033].

MSC:
68N15 Theory of programming languages
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