asTypeOf, error, undefined,
seq, ($!)
- , MVar, newMVar, putMVar, takeMVar
-
+ , MVar, newEmptyMVar, newMVar, putMVar, takeMVar, readMVar, swapMVar
+ , ThreadId, forkIO
,trace
- -- Arrrggghhh!!! Help! Help! Help!
- -- What?! Prelude.hs doesn't even _define_ most of these things!
+
+ , STRef, newSTRef, readSTRef, writeSTRef
+ , IORef, newIORef, readIORef, writeIORef
+
+ -- This lot really shouldn't be exported, but are needed to
+ -- implement various libs.
,primCompAux,PrimArray,primRunST,primNewArray,primWriteArray
,primUnsafeFreezeArray,primIndexArray,primGetRawArgs,primGetEnv
,nh_stdin,nh_stdout,nh_stderr,copy_String_to_cstring,nh_open
,nh_free,nh_close,nh_errno,nh_flush,nh_read,primIntToChar
,unsafeInterleaveIO,nh_write,primCharToInt,
- nullAddr, incAddr, isNullAddr,
- -- debugging hacks
- --,ST(..)
- --,primIntToAddr
- --,primGetArgc
- --,primGetArgv
+ nullAddr, incAddr, isNullAddr,
+ nh_filesize, nh_iseof, nh_system, nh_exitwith, nh_getPID,
+ nh_getCPUtime, nh_getCPUprec, prelCleanupAfterRunAction,
+
+ Word,
+ primGtWord, primGeWord, primEqWord, primNeWord,
+ primLtWord, primLeWord, primMinWord, primMaxWord,
+ primPlusWord, primMinusWord, primTimesWord, primQuotWord,
+ primRemWord, primQuotRemWord, primNegateWord, primAndWord,
+ primOrWord, primXorWord, primNotWord, primShiftLWord,
+ primShiftRAWord, primShiftRLWord, primIntToWord, primWordToInt,
+
+ primAndInt, primOrInt, primXorInt, primNotInt,
+ primShiftLInt, primShiftRAInt, primShiftRLInt,
+
+ primAddrToInt, primIntToAddr,
+
+ primDoubleToFloat, primFloatToDouble,
+
) where
-- Standard value bindings {Prelude} ----------------------------------------
-- Minimal complete definition: toEnum, fromEnum
succ = toEnum . (1+) . fromEnum
pred = toEnum . subtract 1 . fromEnum
+ enumFrom x = map toEnum [ fromEnum x .. ]
enumFromTo x y = map toEnum [ fromEnum x .. fromEnum y ]
+ enumFromThen x y = map toEnum [ fromEnum x, fromEnum y .. ]
enumFromThenTo x y z = map toEnum [ fromEnum x, fromEnum y .. fromEnum z ]
-- Read and Show classes ------------------------------------------------------
primCompAux :: Ord a => a -> a -> Ordering -> Ordering
primCompAux x y o = case compare x y of EQ -> o; LT -> LT; GT -> GT
-primPmInt :: Num a => Int -> a -> Bool
-primPmInt n x = fromInt n == x
+hugsprimPmInt :: Num a => Int -> a -> Bool
+hugsprimPmInt n x = fromInt n == x
-primPmInteger :: Num a => Integer -> a -> Bool
-primPmInteger n x = fromInteger n == x
+hugsprimPmInteger :: Num a => Integer -> a -> Bool
+hugsprimPmInteger n x = fromInteger n == x
primPmDouble :: Fractional a => Double -> a -> Bool
primPmDouble n x = fromDouble n == x
primPmFail = error "Pattern Match Failure"
-- used in desugaring Foreign functions
-primMkIO :: (RealWorld -> (a,RealWorld)) -> IO a
-primMkIO = ST
+hugsprimMkIO :: (RealWorld -> (a,RealWorld)) -> IO a
+hugsprimMkIO = ST
-primCreateAdjThunk :: (a -> b) -> String -> Char -> IO Addr
-primCreateAdjThunk fun typestr callconv
+hugsprimCreateAdjThunk :: (a -> b) -> String -> Char -> IO Addr
+hugsprimCreateAdjThunk fun typestr callconv
= do sp <- makeStablePtr fun
p <- copy_String_to_cstring typestr -- is never freed
a <- primCreateAdjThunkARCH sp p callconv
return a
-- The following primitives are only needed if (n+k) patterns are enabled:
-primPmNpk :: Integral a => Int -> a -> Maybe a
-primPmNpk n x = if n'<=x then Just (x-n') else Nothing
- where n' = fromInt n
+hugsprimPmSub :: Integral a => Int -> a -> a
+hugsprimPmSub n x = x - fromInt n
+
+hugsprimPmFromInteger :: Integral a => Integer -> a
+hugsprimPmFromInteger = fromIntegral
+
+hugsprimPmSubtract :: Integral a => a -> a -> a
+hugsprimPmSubtract x y = x - y
-primPmSub :: Integral a => Int -> a -> a
-primPmSub n x = x - fromInt n
+hugsprimPmLe :: Integral a => a -> a -> Bool
+hugsprimPmLe x y = x <= y
-- Unpack strings generated by the Hugs code generator.
-- Strings can contain \0 provided they're coded right.
type FILE_STAR = Addr -- FILE *
-foreign import "nHandle" "nh_stdin" nh_stdin :: IO FILE_STAR
-foreign import "nHandle" "nh_stdout" nh_stdout :: IO FILE_STAR
-foreign import "nHandle" "nh_stderr" nh_stderr :: IO FILE_STAR
-foreign import "nHandle" "nh_write" nh_write :: FILE_STAR -> Char -> IO ()
-foreign import "nHandle" "nh_read" nh_read :: FILE_STAR -> IO Int
-foreign import "nHandle" "nh_open" nh_open :: Addr -> Int -> IO FILE_STAR
-foreign import "nHandle" "nh_flush" nh_flush :: FILE_STAR -> IO ()
-foreign import "nHandle" "nh_close" nh_close :: FILE_STAR -> IO ()
-foreign import "nHandle" "nh_errno" nh_errno :: IO Int
-
-foreign import "nHandle" "nh_malloc" nh_malloc :: Int -> IO Addr
-foreign import "nHandle" "nh_free" nh_free :: Addr -> IO ()
-foreign import "nHandle" "nh_store" nh_store :: Addr -> Char -> IO ()
-foreign import "nHandle" "nh_load" nh_load :: Addr -> IO Char
-foreign import "nHandle" "nh_getenv" nh_getenv :: Addr -> IO Addr
+foreign import "nHandle" "nh_stdin" nh_stdin :: IO FILE_STAR
+foreign import "nHandle" "nh_stdout" nh_stdout :: IO FILE_STAR
+foreign import "nHandle" "nh_stderr" nh_stderr :: IO FILE_STAR
+foreign import "nHandle" "nh_write" nh_write :: FILE_STAR -> Char -> IO ()
+foreign import "nHandle" "nh_read" nh_read :: FILE_STAR -> IO Int
+foreign import "nHandle" "nh_open" nh_open :: Addr -> Int -> IO FILE_STAR
+foreign import "nHandle" "nh_flush" nh_flush :: FILE_STAR -> IO ()
+foreign import "nHandle" "nh_close" nh_close :: FILE_STAR -> IO ()
+foreign import "nHandle" "nh_errno" nh_errno :: IO Int
+
+foreign import "nHandle" "nh_malloc" nh_malloc :: Int -> IO Addr
+foreign import "nHandle" "nh_free" nh_free :: Addr -> IO ()
+foreign import "nHandle" "nh_store" nh_store :: Addr -> Char -> IO ()
+foreign import "nHandle" "nh_load" nh_load :: Addr -> IO Char
+foreign import "nHandle" "nh_getenv" nh_getenv :: Addr -> IO Addr
+foreign import "nHandle" "nh_filesize" nh_filesize :: FILE_STAR -> IO Int
+foreign import "nHandle" "nh_iseof" nh_iseof :: FILE_STAR -> IO Int
+foreign import "nHandle" "nh_system" nh_system :: Addr -> IO Int
+foreign import "nHandle" "nh_exitwith" nh_exitwith :: Int -> IO ()
+foreign import "nHandle" "nh_getPID" nh_getPID :: IO Int
+
+foreign import "nHandle" "nh_getCPUtime" nh_getCPUtime :: IO Double
+foreign import "nHandle" "nh_getCPUprec" nh_getCPUprec :: IO Double
copy_String_to_cstring :: String -> IO Addr
copy_String_to_cstring s
-- ST, IO --------------------------------------------------------------------
------------------------------------------------------------------------------
--- Do not change this newtype to a data, or MVars will stop
--- working. In general the MVar stuff is pretty fragile: do
--- not mess with it.
newtype ST s a = ST (s -> (a,s))
data RealWorld
type IO a = ST RealWorld a
-
--primRunST :: (forall s. ST s a) -> a
primRunST :: ST RealWorld a -> a
primRunST m = fst (unST m theWorld)
m >>= k = ST (\s -> case unST m s of { (a,s') -> unST (k a) s' })
+-- Library IO has a global variable which accumulates Handles
+-- as they are opened. We keep here a second global variable
+-- into which a cleanup action may be specified. When evaluation
+-- finishes, either normally or as a result of System.exitWith,
+-- this cleanup action is run, closing all known-about Handles.
+-- Doing it like this means the Prelude does not have to know
+-- anything about the grotty details of the Handle implementation.
+prelCleanupAfterRunAction :: IORef (Maybe (IO ()))
+prelCleanupAfterRunAction = primRunST (newIORef Nothing)
+
-- used when Hugs invokes top level function
-primRunIO :: IO () -> ()
-primRunIO m
- = protect (fst (unST m realWorld))
+hugsprimRunIO_toplevel :: IO a -> ()
+hugsprimRunIO_toplevel m
+ = protect 5 (fst (unST composite_action realWorld))
where
- realWorld = error "primRunIO: entered the RealWorld"
- protect :: () -> ()
- protect comp
- = primCatch comp (\e -> fst (unST (putStr (show e ++ "\n")) realWorld))
+ composite_action
+ = do writeIORef prelCleanupAfterRunAction Nothing
+ m
+ cleanup_handles <- readIORef prelCleanupAfterRunAction
+ case cleanup_handles of
+ Nothing -> return ()
+ Just xx -> xx
-trace :: String -> a -> a
+ realWorld = error "primRunIO: entered the RealWorld"
+ protect :: Int -> () -> ()
+ protect 0 comp
+ = comp
+ protect n comp
+ = primCatch (protect (n-1) comp)
+ (\e -> fst (unST (putStr (show e ++ "\n")) realWorld))
+
+trace, trace_quiet :: String -> a -> a
trace s x
- = (primRunST (putStr ("trace: " ++ s ++ "\n"))) `seq` x
+ = trace_quiet ("trace: " ++ s) x
+trace_quiet s x
+ = (primRunST (putStr (s ++ "\n"))) `seq` x
unsafeInterleaveST :: ST s a -> ST s a
unsafeInterleaveST m = ST (\ s -> (fst (unST m s), s))
------------------------------------------------------------------------------
--- Word, Addr, StablePtr, Prim*Array, ThreadId, MVar -------------------------
+-- Word, Addr, StablePtr, Prim*Array -----------------------------------------
------------------------------------------------------------------------------
data Addr
(>=) = primGeAddr
(>) = primGtAddr
-
data Word
instance Eq Word where
(>=) = primGeWord
(>) = primGtWord
-
data StablePtr a
makeStablePtr :: a -> IO (StablePtr a)
data PrimArray a -- immutable arrays with Int indices
data PrimByteArray
-data Ref s a -- mutable variables
+data STRef s a -- mutable variables
data PrimMutableArray s a -- mutable arrays with Int indices
data PrimMutableByteArray s
-data ThreadId
+newSTRef :: a -> ST s (STRef s a)
+newSTRef = primNewRef
+readSTRef :: STRef s a -> ST s a
+readSTRef = primReadRef
+writeSTRef :: STRef s a -> a -> ST s ()
+writeSTRef = primWriteRef
-data MVar a
+type IORef a = STRef RealWorld a
+newIORef :: a -> IO (IORef a)
+newIORef = primNewRef
+readIORef :: IORef a -> IO a
+readIORef = primReadRef
+writeIORef :: IORef a -> a -> IO ()
+writeIORef = primWriteRef
-newMVar :: IO (MVar a)
-newMVar = primNewMVar
+------------------------------------------------------------------------------
+-- ThreadId, MVar, concurrency stuff -----------------------------------------
+------------------------------------------------------------------------------
+
+data MVar a
+
+newEmptyMVar :: IO (MVar a)
+newEmptyMVar = primNewEmptyMVar
putMVar :: MVar a -> a -> IO ()
putMVar = primPutMVar
-- primTakeMVar_wrk has the special property that it is
-- restartable by the scheduler, should the MVar be empty.
+newMVar :: a -> IO (MVar a)
+newMVar value =
+ newEmptyMVar >>= \ mvar ->
+ putMVar mvar value >>
+ return mvar
+
+readMVar :: MVar a -> IO a
+readMVar mvar =
+ takeMVar mvar >>= \ value ->
+ putMVar mvar value >>
+ return value
+
+swapMVar :: MVar a -> a -> IO a
+swapMVar mvar new =
+ takeMVar mvar >>= \ old ->
+ putMVar mvar new >>
+ return old
+
+instance Eq (MVar a) where
+ m1 == m2 = primSameMVar m1 m2
+
+
+data ThreadId
+
+instance Eq ThreadId where
+ tid1 == tid2 = primCmpThreadIds tid1 tid2 == 0
+
+instance Ord ThreadId where
+ compare tid1 tid2
+ = let r = primCmpThreadIds tid1 tid2
+ in if r < 0 then LT else if r > 0 then GT else EQ
+
+
+forkIO :: IO a -> IO ThreadId
+-- Simple version; doesn't catch exceptions in computation
+-- forkIO computation
+-- = primForkIO (primRunST computation)
+
+forkIO computation
+ = primForkIO (
+ primCatch
+ (unST computation realWorld `primSeq` ())
+ (\e -> trace_quiet ("forkIO: uncaught exception: " ++ show e) ())
+ )
+ where
+ realWorld = error "primForkIO: entered the RealWorld"
+
-- showFloat ------------------------------------------------------------------
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