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|
{-# LANGUAGE ViewPatterns #-}
module GHC.Driver.Errors (
warningsToMessages
, printOrThrowWarnings
, printBagOfErrors
, isWarnMsgFatal
, handleFlagWarnings
) where
import GHC.Driver.Session
import GHC.Data.Bag
import GHC.Utils.Exception
import GHC.Utils.Error ( formatErrDoc, sortMsgBag )
import GHC.Types.SourceError ( mkSrcErr )
import GHC.Prelude
import GHC.Types.SrcLoc
import GHC.Types.Error
import GHC.Utils.Outputable ( text, withPprStyle, mkErrStyle )
import qualified GHC.Driver.CmdLine as CmdLine
-- | Converts a list of 'WarningMessages' into 'Messages', where the second element contains only
-- error, i.e. warnings that are considered fatal by GHC based on the input 'DynFlags'.
warningsToMessages :: DynFlags -> WarningMessages -> Messages
warningsToMessages dflags =
partitionBagWith $ \warn ->
case isWarnMsgFatal dflags warn of
Nothing -> Left warn
Just err_reason ->
Right warn{ errMsgSeverity = SevError
, errMsgReason = ErrReason err_reason }
printBagOfErrors :: DynFlags -> Bag ErrMsg -> IO ()
printBagOfErrors dflags bag_of_errors
= sequence_ [ let style = mkErrStyle unqual
ctx = initSDocContext dflags style
in putLogMsg dflags reason sev s $ withPprStyle style (formatErrDoc ctx doc)
| ErrMsg { errMsgSpan = s,
errMsgDoc = doc,
errMsgSeverity = sev,
errMsgReason = reason,
errMsgContext = unqual } <- sortMsgBag (Just dflags)
bag_of_errors ]
handleFlagWarnings :: DynFlags -> [CmdLine.Warn] -> IO ()
handleFlagWarnings dflags warns = do
let warns' = filter (shouldPrintWarning dflags . CmdLine.warnReason) warns
-- It would be nicer if warns :: [Located MsgDoc], but that
-- has circular import problems.
bag = listToBag [ mkPlainWarnMsg loc (text warn)
| CmdLine.Warn _ (L loc warn) <- warns' ]
printOrThrowWarnings dflags bag
-- | Checks if given 'WarnMsg' is a fatal warning.
isWarnMsgFatal :: DynFlags -> WarnMsg -> Maybe (Maybe WarningFlag)
isWarnMsgFatal dflags ErrMsg{errMsgReason = Reason wflag}
= if wopt_fatal wflag dflags
then Just (Just wflag)
else Nothing
isWarnMsgFatal dflags _
= if gopt Opt_WarnIsError dflags
then Just Nothing
else Nothing
-- Given a warn reason, check to see if it's associated -W opt is enabled
shouldPrintWarning :: DynFlags -> CmdLine.WarnReason -> Bool
shouldPrintWarning dflags CmdLine.ReasonDeprecatedFlag
= wopt Opt_WarnDeprecatedFlags dflags
shouldPrintWarning dflags CmdLine.ReasonUnrecognisedFlag
= wopt Opt_WarnUnrecognisedWarningFlags dflags
shouldPrintWarning _ _
= True
-- | Given a bag of warnings, turn them into an exception if
-- -Werror is enabled, or print them out otherwise.
printOrThrowWarnings :: DynFlags -> Bag WarnMsg -> IO ()
printOrThrowWarnings dflags warns = do
let (make_error, warns') =
mapAccumBagL
(\make_err warn ->
case isWarnMsgFatal dflags warn of
Nothing ->
(make_err, warn)
Just err_reason ->
(True, warn{ errMsgSeverity = SevError
, errMsgReason = ErrReason err_reason
}))
False warns
if make_error
then throwIO (mkSrcErr warns')
else printBagOfErrors dflags warns
|
