Transforming Big-Step to Small-Step Semantics Using Interpreter Specialisation.

Natural semantics (big-step) and structural operational semantics (small-step) each have advantages, so it can be useful to produce both semantic forms for a language. Previous work has shown that big-step semantics can be transformed to small-step semantics. This is also the goal of our work, but our main contribution is to show that this can be done by specialisation of an interpreter that imposes a small-step execution on big-step transition rules. This is arguably more direct, transparent and flexible than previous methods. The paper contains two examples and further examples are available in an online repository.