+#include "../includes/ghcconfig.h"
+
+import Config
+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 */
+
+import CONCURRENT ( myThreadId )
+#endif /* mingw32_HOST_OS */
+
+# 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 DYNAMIC
+import qualified EXCEPTION as Exception
+import TRACE ( trace )
+import UNSAFE_IO ( unsafePerformIO )
+
+import System
+\end{code}
+
+GHC's own exception type.
+
+\begin{code}
+ghcError :: GhcException -> a
+ghcError e = Exception.throwDyn e
+
+-- error messages all take the form
+--
+-- <location>: <error>
+--
+-- If the location is on the command line, or in GHC itself, then
+-- <location>="ghc". All of the error types below correspond to
+-- a <location> of "ghc", except for ProgramError (where the string is
+-- assumed to contain a location already, so we don't print one).
+
+data GhcException
+ = PhaseFailed String -- name of phase
+ ExitCode -- an external phase (eg. cpp) failed
+ | Interrupted -- someone pressed ^C
+ | UsageError String -- prints the short usage msg after the error
+ | CmdLineError String -- cmdline prob, but doesn't print usage
+ | Panic String -- the `impossible' happened
+ | InstallationError String -- an installation problem
+ | ProgramError String -- error in the user's code, probably
+ deriving Eq
+
+progName = unsafePerformIO (getProgName)
+{-# NOINLINE progName #-}
+
+short_usage = "Usage: For basic information, try the `--help' option."
+
+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
+
+instance Show GhcException where
+ showsPrec _ e@(ProgramError _) = showGhcException e
+ showsPrec _ e = showString progName . showString ": " . showGhcException e
+
+showGhcException (UsageError str)
+ = showString str . showChar '\n' . showString short_usage
+showGhcException (PhaseFailed phase code)
+ = showString "phase `" . showString phase .
+ showString "' failed (exitcode = " . shows int_code .
+ showString ")"
+ where
+ int_code =
+ case code of
+ ExitSuccess -> (0::Int)
+ ExitFailure x -> x
+showGhcException (CmdLineError str)
+ = showString str
+showGhcException (ProgramError str)
+ = showString str
+showGhcException (InstallationError str)
+ = showString str
+showGhcException (Interrupted)
+ = showString "interrupted"
+showGhcException (Panic s)
+ = showString ("panic! (the `impossible' happened, GHC version "
+ ++ cProjectVersion ++ "):\n\t"
+ ++ s ++ "\n\n"
+ ++ "Please report it as a compiler bug "
+ ++ "to glasgow-haskell-bugs@haskell.org,\n"
+ ++ "or http://sourceforge.net/projects/ghc/.\n\n")
+
+#if __GLASGOW_HASKELL__ < 603
+myMkTyConApp = mkAppTy
+#else
+myMkTyConApp = mkTyConApp
+#endif
+
+ghcExceptionTc = mkTyCon "GhcException"
+{-# NOINLINE ghcExceptionTc #-}
+instance Typeable GhcException where
+ typeOf _ = myMkTyConApp ghcExceptionTc []