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Data Linkage Algebra, Data Linkage Dynamics, and Priority Rewriting

Bergstra J.A., Middelburg C.A.

Fundamenta Informaticae

2013

Vol. 128, nr 4

367--412

We introduce an algebra of data linkages. Data linkages are intended for modelling the states of computations in which dynamic data structures are involved. We present a simple model of computation in which states of computations are modelled as data linkages and state changes take place by means of certain actions. We describe the state changes and replies that result from performing those actions by means of a term rewriting system with rule priorities. The model in question is an upgrade of molecular dynamics. The upgrading is mainly concerned with the features to deal with values and the features to reclaim garbage.

Data Linkage Dynamics with Shedding

Bergstra J.A., Middelburg C.A.

Fundamenta Informaticae

2010

Vol. 103, nr 1-4

31-52

We study shedding in the setting of data linkage dynamics, a simple model of computation that bears on the use of dynamic data structures in programming. Shedding is complementary to garbage collection. With shedding, each time a link to a data object is updated by a program, it is determined whether or not the link will possibly be used once again by the program, and if not the link is automatically removed. Thus, everything is made garbage as soon as it can be viewed as garbage. By that, the effectiveness of garbage collection becomes maximal.