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Set known-folded permission mask to empty if an unfold statement unfolds all permissions of a predicate #571

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Set known-folded permission mask to empty if an unfold statement unfolds all permissions of a predicate #571

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3 changes: 3 additions & 0 deletions src/main/scala/viper/carbon/modules/impls/DefaultHeapModule.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -640,6 +640,9 @@ class DefaultHeapModule(val verifier: Verifier)

If(UnExp(Not,hasDirectPerm(loc)), resetPredicateInfo, Nil) ++
addPermissionToPMask(loc) ++ stateModule.assumeGoodState} )
case sil.Unfold(sil.PredicateAccessPredicate([email protected](_, _), _)) =>
val knownfolded_update: Stmt = curHeapAssignUpdatePredWandMask(predicateMask(loc).maskField, zeroPMask)
stmt ++ If(UnExp(Not,hasDirectPerm(loc)), knownfolded_update, Nil)
case sil.FieldAssign(lhs, rhs) =>
if(usingOldState) sys.error("heap module: field is assigned while using old state")
stmt ++ (currentHeapAssignUpdate(lhs, translateExp(rhs))) // after all checks
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