%T Mobile Escape Analysis for occam\-pi
%A Frederick R. M. Barnes
%E Peter H. Welch, Herman Roebbers, Jan F. Broenink, Frederick R. M. Barnes, Carl G. Ritson, Adam T. Sampson, G. S. Stiles, Brian Vinter
%B Communicating Process Architectures 2009
%X Escape analysis is the process of discovering boundaries
of dynamically allocated objects in programming languages.
For object\-oriented languages such as C++ and Java, this
analysis leads to an understanding of which program objects
interact directly, as well as what objects hold references
to other objects. Such information can be used to help
verify the correctness of an implementation with respect to
its design, or provide information to a run\-time
system about which objects can be allocated on the stack
(because they do not \[dq]escape\[dq] the method in which
they are declared). For existing object\-oriented
languages, this analysis is typically made difficult by
aliasing endemic to the language, and is further complicated
by inheritance and polymorphism. In contrast, the occam\-pi
programming language is a process\-oriented language, with
systems built from layered networks of communicating
concurrent processes. The language has a strong
relationship with the CSP process algebra, that can be used
to reason formally about the correctness of occam\-pi
programs. This paper presents early work on a compositional
escape analysis technique for mobiles in the occam\-pi
programming language, in a style not dissimilar to existing
CSP analyses. The primary aim is to discover the boundaries
of mobiles within the communication graph, and to determine
whether or not they escape any particular process or network
of processes. The technique is demonstrated by analysing
some typical occam\-pi processes and networks, giving a
formal understanding of their mobile escape behaviour.
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