Abstract
We present a semantics-based technique for analysing probabilistic properties of imperative programs. This consists in a probabilistic version of classical data flow analysis. We apply this technique to pWhile programs, i.e programs written in a probabilistic version of a simple While language. As a first step we introduce a syntax based definition of a linear operator semantics (LOS) which is equivalent to the standard structural operational semantics of While. The LOS of a pWhile program can be seen as the generator of a Discrete Time Markov Chain and plays a similar role as a collecting or trace semantics for classical While. Probabilistic Abstract Interpretation techniques are then employed in order to define data flow analyses for properties like Parity and Live Variables.
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