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Erschienen in:
2013 | OriginalPaper | Buchkapitel
Coeffects: Unified Static Analysis of Context-Dependence
verfasst von : Tomas Petricek, Dominic Orchard, Alan Mycroft
Erschienen in: Automata, Languages, and Programming
Verlag: Springer Berlin Heidelberg
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Monadic effect systems provide a unified way of tracking effects of computations, but there is no unified mechanism for tracking how computations rely on the environment in which they are executed. This is becoming an important problem for modern software – we need to track where distributed computations run, which resources a program uses and how they use other capabilities of the environment.
We consider three examples of context-dependence analysis:
liveness
analysis, tracking the use of
implicit parameters
(similar to tracking of
resource usage
in distributed computation), and calculating caching requirements for
dataflow
programs. Informed by these cases, we present a unified calculus for tracking context dependence in functional languages together with a categorical semantics based on
indexed comonads
. We believe that indexed comonads are the right foundation for constructing context-aware languages and type systems and that following an approach akin to monads can lead to a widespread use of the concept.