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definition:
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addPreConditions :: TAProg -> VStateM TAProg
addPreConditions prog = do
newfuns <- mapM addPreCondition (progFuncs prog)
return $ updProgFuncs (const (concat newfuns)) prog
where
addPreCondition fdecl@(AFunc qf ar vis fty rule) = do
preconds <- gets $ preConds . trInfo
return $
if toPreCondQName qf `elem` map funcName preconds
then let newrule = checkPreCondRule qf rule
in [updFuncRule (const newrule) fdecl,
AFunc (toNoCheckQName qf) ar vis fty rule]
else [fdecl]
checkPreCondRule :: QName -> TARule -> TARule
checkPreCondRule qn (ARule rty rargs _) =
ARule rty rargs (addPreConditionCheck rty FuncCall qn rty
(map (\ (v,t) -> AVar t v) rargs))
checkPreCondRule qn (AExternal _ _) = error $
"addPreConditions: cannot add precondition to external operation '" ++
snd qn ++ "'!"
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demand:
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no demanded arguments
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deterministic:
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deterministic operation
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documentation:
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---------------------------------------------------------------------------
-- Add (non-trivial) preconditions:
-- If an operation `f` has some precondition `f'pre`,
-- replace the rule `f xs = rhs` by the following rules:
--
-- f xs = checkPreCond (f'NOCHECK xs) (f'pre xs) "f" xs
-- f'NOCHECK xs = rhs
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failfree:
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<FAILING>
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indeterministic:
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referentially transparent operation
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infix:
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no fixity defined
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iotype:
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{(_) |-> _}
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name:
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addPreConditions
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precedence:
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no precedence defined
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result-values:
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_
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signature:
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FlatCurry.Annotated.Types.AProg FlatCurry.Types.TypeExpr
-> Control.Monad.Trans.State.StateT VerifierState.VState Prelude.IO (FlatCurry.Annotated.Types.AProg FlatCurry.Types.TypeExpr)
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solution-complete:
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operation might suspend on free variables
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terminating:
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possibly non-terminating
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totally-defined:
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possibly non-reducible on same data term
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