Track program-logic reads precisely in proc-change rewrites#948
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Track program-logic reads precisely in proc-change rewrites#948
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Add generic fold helpers for formulas and exception postconditions, then use them to expose reduced-form program-logic formulas and a form_read analysis in EcPV. Use that read analysis in ecPhlRewrite to compute the preserved pre/post equalities for proc-change goals from the goal's actual logic formula rather than from the previous coarse write-based approximation. Also factor statement-logic accessors in EcLowPhlGoal to support the new read computation.
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Add generic fold helpers for formulas and exception postconditions, then use them to expose reduced-form program-logic formulas and a form_read analysis in EcPV.
Use that read analysis in ecPhlRewrite to compute the preserved pre/post equalities for proc-change goals from the goal's actual logic formula rather than from the previous coarse write-based approximation.
Also factor statement-logic accessors in EcLowPhlGoal to support the new read computation.