-{-# OPTIONS -w #-}
--- The above warning supression flag is a temporary kludge.
--- While working on this module you are encouraged to remove it and fix
--- any warnings in the module. See
--- http://hackage.haskell.org/trac/ghc/wiki/Commentary/CodingStyle#Warnings
--- for details
-
--
-- (c) The University of Glasgow 2002-2006
--
-- I/O operations
IORef, newMutVar, readMutVar, writeMutVar, updMutVar
) where
-#include "HsVersions.h"
-import Panic ( try, tryUser, tryMost, Exception(..) )
+import Exception
+import Panic
import Data.IORef ( IORef, newIORef, readIORef, writeIORef, modifyIORef )
import System.IO.Unsafe ( unsafeInterleaveIO )
newtype IOEnv env a = IOEnv (env -> IO a)
+
+unIOEnv :: IOEnv env a -> (env -> IO a)
unIOEnv (IOEnv m) = m
instance Monad (IOEnv m) where
(>>=) = thenM
(>>) = thenM_
return = returnM
- fail s = failM -- Ignore the string
+ fail _ = failM -- Ignore the string
instance Applicative (IOEnv m) where
pure = returnM
fmap f (IOEnv m) = IOEnv (\ env -> fmap f (m env))
returnM :: a -> IOEnv env a
-returnM a = IOEnv (\ env -> return a)
+returnM a = IOEnv (\ _ -> return a)
thenM :: IOEnv env a -> (a -> IOEnv env b) -> IOEnv env b
thenM (IOEnv m) f = IOEnv (\ env -> do { r <- m env ;
thenM_ (IOEnv m) f = IOEnv (\ env -> do { m env ; unIOEnv f env })
failM :: IOEnv env a
-failM = IOEnv (\ env -> ioError (userError "IOEnv failure"))
+failM = IOEnv (\ _ -> ioError (userError "IOEnv failure"))
failWithM :: String -> IOEnv env a
-failWithM s = IOEnv (\ env -> ioError (userError s))
+failWithM s = IOEnv (\ _ -> ioError (userError s))
---------------------------
+#if __GLASGOW_HASKELL__ < 609
tryM :: IOEnv env r -> IOEnv env (Either Exception r)
+#else
+tryM :: IOEnv env r -> IOEnv env (Either ErrorCall r)
+#endif
-- Reflect UserError exceptions (only) into IOEnv monad
-- Other exceptions are not caught; they are simply propagated as exns
--
-- begin compiled!
tryM (IOEnv thing) = IOEnv (\ env -> tryUser (thing env))
-tryAllM :: IOEnv env r -> IOEnv env (Either Exception r)
+-- XXX We shouldn't be catching everything, e.g. timeouts
+tryAllM :: IOEnv env r -> IOEnv env (Either SomeException r)
-- Catch *all* exceptions
-- This is used when running a Template-Haskell splice, when
-- even a pattern-match failure is a programmer error
tryAllM (IOEnv thing) = IOEnv (\ env -> try (thing env))
-tryMostM :: IOEnv env r -> IOEnv env (Either Exception r)
+tryMostM :: IOEnv env r -> IOEnv env (Either SomeException r)
tryMostM (IOEnv thing) = IOEnv (\ env -> tryMost (thing env))
---------------------------
----------------------------------------------------------------------
instance MonadIO (IOEnv env) where
- liftIO io = IOEnv (\ env -> io)
+ liftIO io = IOEnv (\ _ -> io)
newMutVar :: a -> IOEnv env (IORef a)
newMutVar val = liftIO (newIORef val)
-- | Perform a computation with a different environment
setEnv :: env' -> IOEnv env' a -> IOEnv env a
{-# INLINE setEnv #-}
-setEnv new_env (IOEnv m) = IOEnv (\ env -> m new_env)
+setEnv new_env (IOEnv m) = IOEnv (\ _ -> m new_env)
-- | Perform a computation with an altered environment
updEnv :: (env -> env') -> IOEnv env' a -> IOEnv env a
-- (for efficiency)
----------------------------------------------------------------------
-{-# -- SPECIALIZE mapM :: (a -> IOEnv env b) -> [a] -> IOEnv env [b] #-}
-{-# -- SPECIALIZE mapM_ :: (a -> IOEnv env b) -> [a] -> IOEnv env () #-}
-{-# -- SPECIALIZE mapSndM :: (b -> IOEnv env c) -> [(a,b)] -> IOEnv env [(a,c)] #-}
-{-# -- SPECIALIZE sequence :: [IOEnv env a] -> IOEnv env [a] #-}
-{-# -- SPECIALIZE sequence_ :: [IOEnv env a] -> IOEnv env () #-}
-{-# -- SPECIALIZE foldlM :: (a -> b -> IOEnv env a) -> a -> [b] -> IOEnv env a #-}
-{-# -- SPECIALIZE foldrM :: (b -> a -> IOEnv env a) -> a -> [b] -> IOEnv env a #-}
-{-# -- SPECIALIZE mapAndUnzipM :: (a -> IOEnv env (b,c)) -> [a] -> IOEnv env ([b],[c]) #-}
-{-# -- SPECIALIZE mapAndUnzip3M :: (a -> IOEnv env (b,c,d)) -> [a] -> IOEnv env ([b],[c],[d]) #-}
-{-# -- SPECIALIZE zipWithM :: (a -> b -> IOEnv env c) -> [a] -> [b] -> IOEnv env [c] #-}
-{-# -- SPECIALIZE zipWithM_ :: (a -> b -> IOEnv env c) -> [a] -> [b] -> IOEnv env () #-}
-{-# -- SPECIALIZE anyM :: (a -> IOEnv env Bool) -> [a] -> IOEnv env Bool #-}
-{-# -- SPECIALIZE when :: Bool -> IOEnv env a -> IOEnv env () #-}
-{-# -- SPECIALIZE unless :: Bool -> IOEnv env a -> IOEnv env () #-}
+-- {-# SPECIALIZE mapM :: (a -> IOEnv env b) -> [a] -> IOEnv env [b] #-}
+-- {-# SPECIALIZE mapM_ :: (a -> IOEnv env b) -> [a] -> IOEnv env () #-}
+-- {-# SPECIALIZE mapSndM :: (b -> IOEnv env c) -> [(a,b)] -> IOEnv env [(a,c)] #-}
+-- {-# SPECIALIZE sequence :: [IOEnv env a] -> IOEnv env [a] #-}
+-- {-# SPECIALIZE sequence_ :: [IOEnv env a] -> IOEnv env () #-}
+-- {-# SPECIALIZE foldlM :: (a -> b -> IOEnv env a) -> a -> [b] -> IOEnv env a #-}
+-- {-# SPECIALIZE foldrM :: (b -> a -> IOEnv env a) -> a -> [b] -> IOEnv env a #-}
+-- {-# SPECIALIZE mapAndUnzipM :: (a -> IOEnv env (b,c)) -> [a] -> IOEnv env ([b],[c]) #-}
+-- {-# SPECIALIZE mapAndUnzip3M :: (a -> IOEnv env (b,c,d)) -> [a] -> IOEnv env ([b],[c],[d]) #-}
+-- {-# SPECIALIZE zipWithM :: (a -> b -> IOEnv env c) -> [a] -> [b] -> IOEnv env [c] #-}
+-- {-# SPECIALIZE zipWithM_ :: (a -> b -> IOEnv env c) -> [a] -> [b] -> IOEnv env () #-}
+-- {-# SPECIALIZE anyM :: (a -> IOEnv env Bool) -> [a] -> IOEnv env Bool #-}
+-- {-# SPECIALIZE when :: Bool -> IOEnv env a -> IOEnv env () #-}
+-- {-# SPECIALIZE unless :: Bool -> IOEnv env a -> IOEnv env () #-}