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Dynamic rebinding for marshalling and update, via redex-time and destruct-time reduction

Part of: JFP Research Articles

Published online by Cambridge University Press:  17 October 2007

PETER SEWELL ,
GARETH STOYLE ,
MICHAEL HICKS ,
GAVIN BIERMAN  and
KEITH WANSBROUGH
PETER SEWELL
Affiliation:
University of Cambridge (e-mail: [email protected])
GARETH STOYLE
Affiliation:
University of Cambridge (e-mail: [email protected])
MICHAEL HICKS
Affiliation:
University of Maryland, College Park (e-mail: [email protected])
GAVIN BIERMAN
Affiliation:
Microsoft Research, Cambridge (e-mail: [email protected])
KEITH WANSBROUGH
Affiliation:
Data Connection Ltd., Edinburgh (e-mail: [email protected])
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Abstract

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Most programming languages adopt static binding, but for distributed programming an exclusive reliance on static binding is too restrictive: dynamic binding is required in various guises, for example, when a marshalled value is received from the network, containing identifiers that must be rebound to local resources. Typically, it is provided only by ad hoc mechanisms that lack clean semantics. In this paper, we adopt a foundational approach, developing core dynamic rebinding mechanisms as extensions to the simply typed call-by-value λ calculus. To do so, we must first explore refinements of the call-by-value reduction strategy that delay instantiation, to ensure computations make use of the most recent versions of rebound definitions. We introduce redex-time and destruct-time strategies. The latter forms the basis for a λmarsh calculus that supports dynamic rebinding of marshalled values, while remaining as far as possible statically typed. We sketch an extension of λmarsh with concurrency and communication, giving examples showing how wrappers for encapsulating untrusted code can be expressed. Finally, we show that a high-level semantics for dynamic updating can also be based on the destruct-time strategy, defining a λupdate calculus with simple primitives to provide type-safe updating of running code. We show how the ideas of this simple calculus extend to more real-world, module-level dynamic updating in the style of Erlang. We thereby establish primitives and a common semantic foundation for a variety of real-world dynamic rebinding requirements.

Type
Articles
Information
Journal of Functional Programming , Volume 18 , Issue 4 , July 2008 , pp. 437 - 502
Copyright
Copyright © Cambridge University Press 2007

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