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|
{-# LANGUAGE ScopedTypeVariables, ViewPatterns #-}
-- | This test checks if 'downsweep can return partial results when various
-- kinds of parse errors occur in modules.
import GHC
import GHC.Driver.Make
import GHC.Driver.Session
import GHC.Utils.Outputable
import GHC.Utils.Exception (ExceptionMonad, ghandle)
import GHC.Data.Bag
import Control.Monad
import Control.Monad.IO.Class (liftIO)
import Control.Exception
import Data.IORef
import Data.List (sort, find, stripPrefix, isPrefixOf, isSuffixOf)
import Data.Either
import System.Environment
import System.Exit
import System.IO
import System.IO.Unsafe (unsafePerformIO)
any_failed :: IORef Bool
any_failed = unsafePerformIO $ newIORef False
{-# NOINLINE any_failed #-}
it :: ExceptionMonad m => [Char] -> m Bool -> m ()
it msg act =
ghandle (\(_ex :: AssertionFailed) -> dofail) $
ghandle (\(_ex :: ExitCode) -> dofail) $ do
res <- act
case res of
False -> dofail
True -> return ()
where
dofail = do
liftIO $ hPutStrLn stderr $ "FAILED: " ++ msg
liftIO $ writeIORef any_failed True
main :: IO ()
main = do
libdir:args <- getArgs
runGhc (Just libdir) $ do
dflags0 <- getSessionDynFlags
(dflags1, _, _) <- parseDynamicFlags dflags0 $ map noLoc $
[ "-fno-diagnostics-show-caret"
-- , "-v3"
] ++ args
_ <- setSessionDynFlags dflags1
go "Parse error in export list"
[ [ "module A where"
, "import B"
]
, [ "module B !parse_error where"
-- ^ this used to cause getImports to throw an exception instead
-- of having downsweep return an error for just this module
, "import C"
]
, [ "module C where"
]
]
(\mss -> return $
sort (map (moduleNameString . moduleName . ms_mod) mss) == ["A"]
)
go "Parse error in export list with bypass module"
[ [ "module A where"
, "import B"
, "import C"
]
, [ "module B !parse_error where"
, "import D"
]
, [ "module C where"
, "import D"
]
, [ "module D where"
]
]
(\mss -> return $
sort (map (moduleNameString . moduleName . ms_mod) mss) == ["A", "C", "D"]
)
go "Parse error in import list"
[ [ "module A where"
, "import B"
]
, [ "module B where"
, "!parse_error"
-- ^ this is silently ignored, getImports assumes the import
-- list is just empty. This smells like a parser bug to me but
-- I'm still documenting this behaviour here.
, "import C"
]
, [ "module C where"
]
]
(\mss -> return $
sort (map (moduleNameString . moduleName . ms_mod) mss) == ["A", "B"]
)
go "CPP preprocessor error"
[ [ "module A where"
, "import B"
]
, [ "{-# LANGUAGE CPP #-}"
, "#elif <- cpp error here"
, "module B where"
, "import C"
]
, [ "module C where"
]
]
(\mss -> return $
sort (map (moduleNameString . moduleName . ms_mod) mss) == ["A"]
)
go "CPP preprocessor error with bypass"
[ [ "module A where"
, "import B"
, "import C"
]
, [ "{-# LANGUAGE CPP #-}"
, "#elif <- cpp error here"
, "module B where"
, "import C"
]
, [ "module C where"
]
]
(\mss -> return $
sort (map (moduleNameString . moduleName . ms_mod) mss) == ["A", "C"]
)
go "Import error"
[ [ "module A where"
, "import B"
, "import DoesNotExist_FooBarBaz"
]
, [ "module B where"
]
]
(\mss -> return $
sort (map (moduleNameString . moduleName . ms_mod) mss) == ["A", "B"]
)
errored <- readIORef any_failed
when errored $ exitFailure
return ()
go :: String -> [[String]] -> ([ModSummary] -> Ghc Bool) -> Ghc ()
go label mods cnd =
defaultErrorHandler defaultFatalMessager defaultFlushOut $ do
liftIO $ hPutStrLn stderr $ "== " ++ label
liftIO $ mapM_ writeMod mods
tgt <- guessTarget "A" Nothing
setTargets [tgt]
hsc_env <- getSession
emss <- liftIO $ downsweep hsc_env [] [] False
-- liftIO $ hPutStrLn stderr $ showSDocUnsafe $ ppr $ rights emss
-- liftIO $ hPrint stderr $ bagToList $ unionManyBags $ lefts emss
it label $ cnd (rights emss)
writeMod :: [String] -> IO ()
writeMod src =
writeFile (mod++".hs") $ unlines src
where
Just modline = find ("module" `isPrefixOf`) src
Just (takeWhile (/=' ') -> mod) = stripPrefix "module " modline
|
