[project @ 2004-11-25 11:36:34 by simonpj]

[ghc-hetmet.git] / ghc / compiler / utils / Panic.lhs

diff --git a/ghc/compiler/utils/Panic.lhs b/ghc/compiler/utils/Panic.lhs
index 32b19ab..60393b5 100644 (file)
--- a/ghc/compiler/utils/Panic.lhs
+++ b/ghc/compiler/utils/Panic.lhs
@@ -12,25 +12,40 @@ some unnecessary loops in the module dependency graph.
 module Panic  
    ( 
      GhcException(..), ghcError, progName, 
+     pgmError,
      panic, panic#, assertPanic, trace,
-     showException, showGhcException, Exception.throwDyn, tryMost,
+     showException, showGhcException, tryMost,
+     installSignalHandlers, 
 
-     Exception.Exception, 
-     Panic.try,        -- try :: IO a -> IO (Either Exception a)
-               -- This is Control.Exception.try in the new library story
-               --         Exception.tryAllIO in GHC 4.08
-               -- So it usefully hides the difference
-
-#if __GLASGOW_HASKELL__ <= 408
-     catchJust, ioErrors, throwTo,
-#endif
+     catchJust, tryJust, ioErrors, throwTo,
    ) where
 
 #include "HsVersions.h"
+#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 )
@@ -107,17 +122,24 @@ showGhcException (Panic s)
                 ++ "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 _ = mkAppTy ghcExceptionTc []
+  typeOf _ = myMkTyConApp ghcExceptionTc []
 \end{code}
 
 Panics and asserts.
 
 \begin{code}
-panic :: String -> a
-panic x = Exception.throwDyn (Panic x)
+panic, pgmError :: String -> a
+panic    x = Exception.throwDyn (Panic x)
+pgmError x = Exception.throwDyn (ProgramError x)
 
 -- #-versions because panic can't return an unboxed int, and that's
 -- what TAG_ is with GHC at the moment.  Ugh. (Simon)
@@ -138,7 +160,7 @@ assertPanic file line =
 -- files, for example.
 
 tryMost :: IO a -> IO (Either Exception.Exception a)
-tryMost action = do r <- try action; filter r
+tryMost action = do r <- myTry action; filter r
   where
    filter (Left e@(Exception.DynException d))
            | Just ghc_ex <- fromDynamic d
@@ -150,9 +172,9 @@ tryMost action = do r <- try action; filter r
      = return other
 
 #if __GLASGOW_HASKELL__ <= 408
-try = Exception.tryAllIO
+myTry = Exception.tryAllIO
 #else
-try = Exception.try
+myTry = Exception.try
 #endif
 \end{code}     
 
@@ -161,7 +183,25 @@ Compatibility stuff:
 \begin{code}
 #if __GLASGOW_HASKELL__ <= 408
 catchJust = Exception.catchIO
+tryJust   = Exception.tryIO
 ioErrors  = Exception.justIoErrors
 throwTo   = Exception.raiseInThread
 #endif
 \end{code}
+
+Standard signal handlers for catching ^C, which just throw an
+exception in the main thread.  NOTE: must be called from the main
+thread.
+
+\begin{code}
+installSignalHandlers :: IO ()
+installSignalHandlers = do
+#ifndef mingw32_HOST_OS
+  main_thread <- myThreadId
+  let sig_handler = Catch (throwTo main_thread 
+                               (Exception.DynException (toDyn Interrupted)))
+  installHandler sigQUIT sig_handler Nothing 
+  installHandler sigINT  sig_handler Nothing
+#endif
+  return ()
+\end{code}