panic, panic#, assertPanic, trace
) where
+import Config
import FastTypes
import Dynamic
ghcError :: GhcException -> a
ghcError e = 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 ExitCode
- | Interrupted
+ = PhaseFailed String 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
- | OtherError String -- just prints the error message
+ | InstallationError String -- an installation problem
+ | ProgramError String -- error in the user's code, probably
deriving Eq
progName = unsafePerformIO (getProgName)
short_usage = "Usage: For basic information, try the `--help' option."
instance Show GhcException where
- showsPrec _ e = showString progName . showString ": " . showBarf e
+ showsPrec _ e@(ProgramError _) = showGhcException e
+ showsPrec _ e = showString progName . showString ": " . showGhcException e
-showBarf (UsageError str)
+showGhcException (UsageError str)
= showString str . showChar '\n' . showString short_usage
-showBarf (OtherError str)
- = showString str
-showBarf (PhaseFailed phase code)
+showGhcException (PhaseFailed phase code)
= showString phase . showString " failed, code = " . shows code
-showBarf (Interrupted)
+showGhcException (CmdLineError str)
+ = showString str
+showGhcException (ProgramError str)
+ = showString str
+showGhcException (InstallationError str)
+ = showString str
+showGhcException (Interrupted)
= showString "interrupted"
-showBarf (Panic s)
- = showString ("panic! (the `impossible' happened):\n\t"
+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\n")
+ ++ "to glasgow-haskell-bugs@haskell.org,\n"
+ ++ "or http://sourceforge.net/projects/ghc/.\n\n")
ghcExceptionTc = mkTyCon "GhcException"
{-# NOINLINE ghcExceptionTc #-}