Frameworks and Calculi for Dynamic Assembly Sample Clauses

Frameworks and Calculi for Dynamic Assembly. Assembly of software is usually approached in an ad-hoc way through makefile or version control systems; even in well specified programming languages this issue is usually underspecified, as remarked by [Car97]. Recently, some calculi were developed to explicitly support assembly. However, these have mostly not been conceived in the context of GC, and therefore have some intrinsic limitations. • High-level reflective languages, like MetaML [She98, TS97], have expressive meta-programming facilities supporting both assembly of code fragments and execution of dynamically assembled programs. However, they often assume that code is written in only one language, while in GC one expects a multiplicity of formats, and at the very least one needs to distinguish between source and binary code. • Module calculi like [AZ99, WV00] provide foundations for languages supporting a module level, with its own typing and reduction rules. These module calculi may support a form of dynamic assembly via the notion of virtual components. However, some issues arising in the context of GC have not yet been explored: for instance, the question of when a module system really supports separate compilation (as pointed out in [Car97]), and the relation between module operators at the language level and linking of binary fragments. • Some ad-hoc formalisms for modeling systems with dynamic fragment assembly have been developed [QGC00, GM99, Dro01, DEW99]. However, these are still at an initial stage. They tend to be very specific to particular languages, like TAL, Java etc. Issues related to the process which goes from source to execution, like separate compilation and linking, are usually considered low-level tasks and vaguely specified, if at all [GM99]. Particular questions, e.g., Java binary compatibility in [DWE98], have been tackled, but there are many issues that need to be resolved. We want to extend and generalize the above results, and to develop abstract frameworks for separate compilation and linking. In this framework not only will we distinguish between the compile- and the run-time phase, but we shall allow the distinction among many phases for each of the fragments, e.g. compile-time, link-time, load-time, resolution time, verification time. We shall define desirable properties of programming environments, and of the evolution of the overall system. We also plan to develop type systems (almost missing presently) which take into account binary fragments as well as source f...
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