%
+% (c) The University of Glasgow 2006
% (c) The GRASP Project, Glasgow University, 1992-2000
%
-\section{Panic error messages}
Defines basic funtions for printing error messages.
\begin{code}
module Panic
(
- GhcException(..), showGhcException, ghcError, progName,
+ GhcException(..), showGhcException, throwGhcException, handleGhcException,
+ ghcError, progName,
pgmError,
- panic, panic#, assertPanic, trace,
+ panic, panicFastInt, assertPanic, trace,
Exception.Exception(..), showException, try, tryJust, tryMost, tryUser,
- catchJust, ioErrors, throwTo,
+ catchJust, throwTo,
installSignalHandlers, interruptTargetThread
) where
import FastTypes
#ifndef mingw32_HOST_OS
-# if __GLASGOW_HASKELL__ > 504
import System.Posix.Signals
-# else
-import Posix ( Handler(Catch), installHandler, sigINT, sigQUIT )
-# endif /* GHC > 504 */
#endif /* mingw32_HOST_OS */
-#if defined(mingw32_HOST_OS) && __GLASGOW_HASKELL__ >= 603
+#if defined(mingw32_HOST_OS)
import GHC.ConsoleHandler
#endif
-# if __GLASGOW_HASKELL__ < 500
-import EXCEPTION ( raiseInThread )
-# else
-import EXCEPTION ( throwTo )
-# endif /* GHC < 500 */
-
-#if __GLASGOW_HASKELL__ > 408
-import EXCEPTION ( catchJust, tryJust, ioErrors )
-#endif
-
-import CONCURRENT ( myThreadId, MVar, ThreadId, withMVar, newEmptyMVar )
-import DYNAMIC
-import qualified EXCEPTION as Exception
-import TRACE ( trace )
-import UNSAFE_IO ( unsafePerformIO )
-import IO ( isUserError )
-
-import System
+import Exception
+import Control.Concurrent ( MVar, ThreadId, withMVar, newMVar )
+import Data.Dynamic
+import Debug.Trace ( trace )
+import System.IO.Unsafe ( unsafePerformIO )
+import System.IO.Error hiding ( try )
+import System.Exit
+import System.Environment
\end{code}
GHC's own exception type.
\begin{code}
ghcError :: GhcException -> a
+#if __GLASGOW_HASKELL__ >= 609
+ghcError e = Exception.throw e
+#else
ghcError e = Exception.throwDyn e
+#endif
-- error messages all take the form
--
| ProgramError String -- error in the user's code, probably
deriving Eq
+#if __GLASGOW_HASKELL__ >= 609
+instance Exception GhcException
+#endif
+
+progName :: String
progName = unsafePerformIO (getProgName)
{-# NOINLINE progName #-}
+short_usage :: String
short_usage = "Usage: For basic information, try the `--help' option."
-
+
+#if __GLASGOW_HASKELL__ < 609
showException :: Exception.Exception -> String
-- Show expected dynamic exceptions specially
showException (Exception.DynException d) | Just e <- fromDynamic d
= show (e::GhcException)
showException other_exn = show other_exn
+#else
+showException :: Exception e => e -> String
+showException = show
+#endif
instance Show GhcException where
showsPrec _ e@(ProgramError _) = showGhcException e
+ showsPrec _ e@(CmdLineError _) = showString "<command line>: " . showGhcException e
showsPrec _ e = showString progName . showString ": " . showGhcException e
+showGhcException :: GhcException -> String -> String
showGhcException (UsageError str)
= showString str . showChar '\n' . showString short_usage
showGhcException (PhaseFailed phase code)
++ s ++ "\n\n"
++ "Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug\n")
-#if __GLASGOW_HASKELL__ < 603
-myMkTyConApp = mkAppTy
-#else
-myMkTyConApp = mkTyConApp
+throwGhcException :: GhcException -> a
+#if __GLASGOW_HASKELL__ < 609
+throwGhcException = Exception.throwDyn
+#else
+throwGhcException = Exception.throw
#endif
+handleGhcException :: ExceptionMonad m => (GhcException -> m a) -> m a -> m a
+#if __GLASGOW_HASKELL__ < 609
+handleGhcException = flip gcatchDyn
+#else
+handleGhcException = ghandle
+#endif
+
+ghcExceptionTc :: TyCon
ghcExceptionTc = mkTyCon "GhcException"
{-# NOINLINE ghcExceptionTc #-}
instance Typeable GhcException where
- typeOf _ = myMkTyConApp ghcExceptionTc []
+ typeOf _ = mkTyConApp ghcExceptionTc []
\end{code}
Panics and asserts.
\begin{code}
panic, pgmError :: String -> a
-panic x = Exception.throwDyn (Panic x)
-pgmError x = Exception.throwDyn (ProgramError x)
+panic x = throwGhcException (Panic x)
+pgmError x = throwGhcException (ProgramError x)
-- #-versions because panic can't return an unboxed int, and that's
-- what TAG_ is with GHC at the moment. Ugh. (Simon)
-- No, man -- Too Beautiful! (Will)
-panic# :: String -> FastInt
-panic# s = case (panic s) of () -> _ILIT 0
+panicFastInt :: String -> FastInt
+panicFastInt s = case (panic s) of () -> _ILIT(0)
assertPanic :: String -> Int -> a
assertPanic file line =
-- exceptions. Used when we want soft failures when reading interface
-- files, for example.
+#if __GLASGOW_HASKELL__ < 609
tryMost :: IO a -> IO (Either Exception.Exception a)
tryMost action = do r <- try action; filter r
where
_other -> return (Left e)
filter other
= return other
+#else
+-- XXX I'm not entirely sure if this is catching what we really want to catch
+tryMost :: IO a -> IO (Either SomeException a)
+tryMost action = do r <- try action
+ case r of
+ Left se@(SomeException e) ->
+ case cast e of
+ -- Some GhcException's we rethrow,
+ Just Interrupted -> throwIO se
+ Just (Panic _) -> throwIO se
+ -- others we return
+ Just _ -> return (Left se)
+ Nothing ->
+ case cast e of
+ -- All IOExceptions are returned
+ Just (_ :: IOException) ->
+ return (Left se)
+ -- Anything else is rethrown
+ Nothing -> throwIO se
+ Right v -> return (Right v)
+#endif
-- | tryUser is like try, but catches only UserErrors.
-- These are the ones that are thrown by the TcRn monad
-- to signal an error in the program being compiled
+#if __GLASGOW_HASKELL__ < 609
tryUser :: IO a -> IO (Either Exception.Exception a)
tryUser action = tryJust tc_errors action
where
-#if __GLASGOW_HASKELL__ > 504 || __GLASGOW_HASKELL__ < 500
tc_errors e@(Exception.IOException ioe) | isUserError ioe = Just e
-#elif __GLASGOW_HASKELL__ == 502
- tc_errors e@(UserError _) = Just e
-#else
- tc_errors e@(Exception.IOException ioe) | isUserError e = Just e
-#endif
tc_errors _other = Nothing
-\end{code}
-
-Compatibility stuff:
-
-\begin{code}
-#if __GLASGOW_HASKELL__ <= 408
-try = Exception.tryAllIO
#else
-try = Exception.try
-#endif
-
-#if __GLASGOW_HASKELL__ <= 408
-catchJust = Exception.catchIO
-tryJust = Exception.tryIO
-ioErrors = Exception.justIoErrors
-throwTo = Exception.raiseInThread
+tryUser :: IO a -> IO (Either IOException a)
+tryUser io =
+ do ei <- try io
+ case ei of
+ Right v -> return (Right v)
+ Left se@(SomeException ex) ->
+ case cast ex of
+ Just ioe
+ | isUserError ioe ->
+ return (Left ioe)
+ _ -> throw se
#endif
\end{code}
installSignalHandlers :: IO ()
installSignalHandlers = do
let
+#if __GLASGOW_HASKELL__ < 609
interrupt_exn = Exception.DynException (toDyn Interrupted)
+#else
+ interrupt_exn = (toException Interrupted)
+#endif
interrupt = do
withMVar interruptTargetThread $ \targets ->
installHandler sigQUIT (Catch interrupt) Nothing
installHandler sigINT (Catch interrupt) Nothing
return ()
-#elif __GLASGOW_HASKELL__ >= 603
+#else
-- GHC 6.3+ has support for console events on Windows
-- NOTE: running GHCi under a bash shell for some reason requires
-- you to press Ctrl-Break rather than Ctrl-C to provoke
installHandler (Catch sig_handler)
return ()
-#else
- return () -- nothing
#endif
{-# NOINLINE interruptTargetThread #-}
interruptTargetThread :: MVar [ThreadId]
-interruptTargetThread = unsafePerformIO newEmptyMVar
+interruptTargetThread = unsafePerformIO (newMVar [])
\end{code}
projects / ghc-hetmet.git / blobdiff