import Bag ( emptyBag, unionBags, isEmptyBag )
import Data.Dynamic ( Typeable )
import qualified Data.Dynamic as Dyn
-#if __GLASGOW_HASKELL__ < 609
-import Data.Dynamic ( toDyn, fromDyn, fromDynamic )
-#else
import Bag ( bagToList )
-#endif
import ErrUtils ( ErrorMessages, WarningMessages, Messages )
import System.FilePath
srcErrorMessages :: SourceError -> ErrorMessages
mkApiErr :: SDoc -> GhcApiError
-#if __GLASGOW_HASKELL__ >= 609
-
-- | A source error is an error that is caused by one or more errors in the
-- source code. A 'SourceError' is thrown by many functions in the
-- compilation pipeline. Inside GHC these errors are merely printed via
mkApiErr = GhcApiError
-#else
-------------------------------------------------------------------------
--- implementation for bootstrapping without extensible exceptions
-
-data SourceException = SourceException ErrorMessages
-sourceExceptionTc :: Dyn.TyCon
-sourceExceptionTc = Dyn.mkTyCon "SourceException"
-{-# NOINLINE sourceExceptionTc #-}
-instance Typeable SourceException where
- typeOf _ = Dyn.mkTyConApp sourceExceptionTc []
-
--- Source error has to look like a normal exception. Throwing a DynException
--- directly would not allow us to use the Exception monad. We also cannot
--- make it part of GhcException as that would lead to circular imports.
-
-type SourceError = Exception
-type GhcApiError = Exception
-
-mkSrcErr msgs = DynException . toDyn $ SourceException msgs
-
-mkApiErr = IOException . userError . showSDoc
-
-srcErrorMessages (DynException ms) =
- let SourceException msgs = (fromDyn ms (panic "SourceException expected"))
- in msgs
-srcErrorMessages _ = panic "SourceError expected"
-
-handleSourceError :: ExceptionMonad m => (Exception -> m a) -> m a -> m a
-handleSourceError handler act =
- gcatch act
- (\e -> case e of
- DynException dyn
- | Just (SourceException _) <- fromDynamic dyn
- -> handler e
- _ -> throw e)
-#endif
-
-- | A monad that allows logging of warnings.
class Monad m => WarnLogMonad m where
setWarnings :: WarningMessages -> m ()
instance ExceptionMonad Ghc where
gcatch act handle =
Ghc $ \s -> unGhc act s `gcatch` \e -> unGhc (handle e) s
-#if __GLASGOW_HASKELL__ < 609
- gcatchDyn act handler =
- Ghc $ \s -> unGhc act s `gcatchDyn` \e -> unGhc (handler e) s
-#endif
+ gblock (Ghc m) = Ghc $ \s -> gblock (m s)
+ gunblock (Ghc m) = Ghc $ \s -> gunblock (m s)
+
instance WarnLogMonad Ghc where
setWarnings warns = Ghc $ \(Session _ wref) -> writeIORef wref warns
-- | Return 'Warnings' accumulated so far.
instance ExceptionMonad m => ExceptionMonad (GhcT m) where
gcatch act handle =
GhcT $ \s -> unGhcT act s `gcatch` \e -> unGhcT (handle e) s
-#if __GLASGOW_HASKELL__ < 609
- gcatchDyn _act _handler = error "cannot use GhcT in stage1"
-#endif
+ gblock (GhcT m) = GhcT $ \s -> gblock (m s)
+ gunblock (GhcT m) = GhcT $ \s -> gunblock (m s)
instance MonadIO m => WarnLogMonad (GhcT m) where
setWarnings warns = GhcT $ \(Session _ wref) -> liftIO $ writeIORef wref warns