Abstract
Dynamic updates in object-oriented languages require highlevel changes to be translated to low-level changes. For example, removing an unused instance variable from a class may shift the indices of other instance variables. The shift needs to be translated to a change of the bytecodes accessing these instance variables. Current languages do not offer a bridge between the two levels of abstraction. We outline such a model, and demonstrate its usefulness by discussing a prototype implementation in Pharo Smalltalk. In addition to simplifying the implementation of dynamic updates, our model enables easy experiments in modifying the language semantics.
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