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implementation module Sil.Check
import StdFile
from StdFunc import flip, o
import StdList
import StdOverloaded
import StdString
import StdTuple
from Data.Func import $, mapSt, seqSt
import Data.Maybe
import Data.Tuple
from Text import <+
import Sil.Syntax
instance toString CheckError
where
toString (ReturnExpressionFromVoidError f)
= "Type error: an expression was returned from void function '" <+ f <+ "'."
toString (NoReturnFromNonVoidError f)
= "Type error: no return from non-void function '" <+ f <+ "'."
instance <<< CheckError where <<< f e = f <<< toString e <<< "\r\n"
checkProgram :: *(Maybe *File) Program -> *([CheckError], *Maybe *File)
checkProgram err prog = appFst flatten $ mapSt (flip checkFunction) prog.p_funs err
checkFunction :: *(Maybe *File) Function -> *([CheckError], *Maybe *File)
checkFunction err f = checkErrors [checkReturnAndVoid] f err
where
checkReturnAndVoid :: Function -> Maybe CheckError
checkReturnAndVoid f = case f.f_type of
TVoid -> case [st \\ st=:(Return (Just _)) <- allStatements f] of
[] -> Nothing
_ -> Just $ ReturnExpressionFromVoidError f.f_name
_ -> if (sureToReturn f.f_code) Nothing (Just $ NoReturnFromNonVoidError f.f_name)
sureToReturn :: CodeBlock -> Bool
sureToReturn cb = case cb.cb_content of
[] -> False
sts -> case last sts of
Return _ -> True
While _ cb` -> sureToReturn cb`
If bs (Just e) -> all sureToReturn [e:map snd bs]
If bs Nothing -> all (sureToReturn o snd) bs
_ -> False
checkErrors :: [(a -> Maybe CheckError)] a *(Maybe *File) -> *([CheckError], *Maybe *File)
checkErrors cks x err = seqSt error (catMaybes $ map (flip ($) x) cks) $ noErrors err
error :: CheckError *([CheckError], *Maybe *File) -> *([CheckError], *Maybe *File)
error e (es, err) = ([e:es], err <?< e)
noErrors :: *(Maybe *File) -> *([CheckError], *Maybe *File)
noErrors f = ([], f)
(<?<) infixl :: !*(Maybe *File) !a -> *Maybe *File | <<< a
(<?<) (Just f) x = Just (f <<< x)
(<?<) Nothing _ = Nothing
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