The Use of Theories in Code Generation

The Theory Plug-in

The theory plug-in is used to add mathematical extensions to Rodin. The theories are created, and deployed, and can then be used in any models in the workspace. When dealing with implementation level models, such as in Tasking Event-B, we need to consider how to translate newly added types and operators into code. We have augmented the theory interface with a Translation Rules section. This enables a user to define translation rules that map Event-B formulas to code.

Translation Rules

Figure 1 shows the interface, and some translations rules of the mapping to Ada.

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Figure 1: Translation Rules

The translation rules are templates used for pattern matching. The meta-variables are defined and typed, and used in the rules. Event-B expressions and predicates are defined on the left hand side of the rule, and the code to be output (as text) appears on the right hand side of the matching rule.