isInfinite, isDenormalized, isIEEE, isNegativeZero),
Monad((>>=), (>>), return, fail),
Functor(fmap),
- mapM, mapM_, accumulate, sequence, (=<<),
+ mapM, mapM_, sequence, sequence_, (=<<),
maybe, either,
(&&), (||), not, otherwise,
subtract, even, odd, gcd, lcm, (^), (^^),
asTypeOf, error, undefined,
seq, ($!)
+ , MVar, newMVar, putMVar, takeMVar
+
,trace
-- Arrrggghhh!!! Help! Help! Help!
-- What?! Prelude.hs doesn't even _define_ most of these things!
,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
-
+ ,unsafeInterleaveIO,nh_write,primCharToInt,
+ nullAddr, incAddr, isNullAddr,
-- debugging hacks
--,ST(..)
--,primIntToAddr
p >> q = p >>= \ _ -> q
fail s = error s
-accumulate :: Monad m => [m a] -> m [a]
-accumulate [] = return []
-accumulate (c:cs) = do x <- c
- xs <- accumulate cs
- return (x:xs)
+sequence :: Monad m => [m a] -> m [a]
+sequence [] = return []
+sequence (c:cs) = do x <- c
+ xs <- sequence cs
+ return (x:xs)
-sequence :: Monad m => [m a] -> m ()
-sequence = foldr (>>) (return ())
+sequence_ :: Monad m => [m a] -> m ()
+sequence_ = foldr (>>) (return ())
mapM :: Monad m => (a -> m b) -> [a] -> m [b]
-mapM f = accumulate . map f
+mapM f = sequence . map f
mapM_ :: Monad m => (a -> m b) -> [a] -> m ()
-mapM_ f = sequence . map f
+mapM_ f = sequence_ . map f
(=<<) :: Monad m => (a -> m b) -> m a -> m b
f =<< x = x >>= f
-- data (a,b) = (a,b) deriving (Eq, Ord, Ix, Read, Show)
-- etc..
--- Functions ----------------------------------------------------------------
-
-instance Show (a -> b) where
- showsPrec p f = showString "<<function>>"
-
-instance Functor ((->) a) where
- fmap = (.)
-
-- Standard Integral types --------------------------------------------------
data Int -- builtin datatype of fixed size integers
primPmInteger :: Num a => Integer -> a -> Bool
primPmInteger n x = fromInteger n == x
-primPmFlt :: Fractional a => Double -> a -> Bool
-primPmFlt n x = fromDouble n == x
+primPmDouble :: Fractional a => Double -> a -> Bool
+primPmDouble n x = fromDouble n == x
-- ToDo: make the message more informative.
primPmFail :: a
e2ioe other = IOError (show other)
putChar :: Char -> IO ()
-putChar c = nh_stdout >>= \h -> nh_write h (primCharToInt c)
+putChar c = nh_stdout >>= \h -> nh_write h c
putStr :: String -> IO ()
-putStr s = --mapM_ putChar s -- correct, but slow
- nh_stdout >>= \h ->
- let loop [] = return ()
- loop (c:cs) = nh_write h (primCharToInt c) >> loop cs
+putStr s = nh_stdout >>= \h ->
+ let loop [] = nh_flush h
+ loop (c:cs) = nh_write h c >> loop cs
in loop s
putStrLn :: String -> IO ()
nh_open ptr 0 >>= \h ->
nh_free ptr >>
nh_errno >>= \errno ->
- if (h == 0 || errno /= 0)
+ if (isNullAddr h || errno /= 0)
then (ioError.IOError) ("readFile: can't open file " ++ fname)
else readfromhandle h
nh_open ptr 1 >>= \h ->
nh_free ptr >>
nh_errno >>= \errno ->
- if (h == 0 || errno /= 0)
+ if (isNullAddr h || errno /= 0)
then (ioError.IOError) ("writeFile: can't create file " ++ fname)
else writetohandle fname h contents
nh_open ptr 2 >>= \h ->
nh_free ptr >>
nh_errno >>= \errno ->
- if (h == 0 || errno /= 0)
+ if (isNullAddr h || errno /= 0)
then (ioError.IOError) ("appendFile: can't open file " ++ fname)
else writetohandle fname h contents
data IOResult = IOResult deriving (Show)
-type FILE_STAR = Int -- FILE *
+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 -> Int -> IO ()
+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_malloc" nh_malloc :: Int -> IO Addr
foreign import "nHandle" "nh_free" nh_free :: Addr -> IO ()
-foreign import "nHandle" "nh_store" nh_store :: Addr -> Int -> IO ()
-foreign import "nHandle" "nh_load" nh_load :: Addr -> IO Int
-
---foreign import "nHandle" "nh_argc" nh_argc :: IO Int
---foreign import "nHandle" "nh_argvb" nh_argvb :: Int -> Int -> IO Int
+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
copy_String_to_cstring :: String -> IO Addr
copy_String_to_cstring s
= nh_malloc (1 + length s) >>= \ptr0 ->
- let loop ptr [] = nh_store ptr 0 >> return ptr0
- loop ptr (c:cs) = nh_store ptr (primCharToInt c) >> loop (incAddr ptr) cs
+ let loop ptr [] = nh_store ptr (chr 0) >> return ptr0
+ loop ptr (c:cs) = nh_store ptr c >> loop (incAddr ptr) cs
in
if isNullAddr ptr0
then error "copy_String_to_cstring: malloc failed"
copy_cstring_to_String :: Addr -> IO String
copy_cstring_to_String ptr
= nh_load ptr >>= \ci ->
- if ci == 0
+ if ci == '\0'
then return []
else copy_cstring_to_String (incAddr ptr) >>= \cs ->
- return ((primIntToChar ci) : cs)
+ return (ci : cs)
readfromhandle :: FILE_STAR -> IO String
readfromhandle h
then return ()
else error ( "writeFile/appendFile: error closing file " ++ fname)
writetohandle fname h (c:cs)
- = nh_write h (primCharToInt c) >>
- writetohandle fname h cs
+ = nh_write h c >> writetohandle fname h cs
primGetRawArgs :: IO [String]
primGetRawArgs
= primGetArgc >>= \argc ->
- accumulate (map get_one_arg [0 .. argc-1])
+ sequence (map get_one_arg [0 .. argc-1])
where
get_one_arg :: Int -> IO String
get_one_arg argno
-- 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
------------------------------------------------------------------------------
--- Word, Addr, StablePtr, Prim*Array -----------------------------------------
+-- Word, Addr, StablePtr, Prim*Array, ThreadId, MVar -------------------------
------------------------------------------------------------------------------
data Addr
data PrimMutableArray s a -- mutable arrays with Int indices
data PrimMutableByteArray s
+data ThreadId
+
+data MVar a
+
+
+newMVar :: IO (MVar a)
+newMVar = primNewMVar
+
+putMVar :: MVar a -> a -> IO ()
+putMVar = primPutMVar
+
+takeMVar :: MVar a -> IO a
+takeMVar m
+ = ST (\world -> primTakeMVar m cont world)
+ where
+ -- cont :: a -> RealWorld -> (a,RealWorld)
+ -- where 'a' is as in the top-level signature
+ cont x world = (x,world)
+
+ -- the type of the handwritten BCO (threesome) primTakeMVar is
+ -- primTakeMVar :: MVar a
+ -- -> (a -> RealWorld -> (a,RealWorld))
+ -- -> RealWorld
+ -- -> (a,RealWorld)
+ --
+ -- primTakeMVar behaves like this:
+ --
+ -- primTakeMVar (MVar# m#) cont world
+ -- = primTakeMVar_wrk m# cont world
+ --
+ -- primTakeMVar_wrk m# cont world
+ -- = cont (takeMVar# m#) world
+ --
+ -- primTakeMVar_wrk has the special property that it is
+ -- restartable by the scheduler, should the MVar be empty.
-- showFloat ------------------------------------------------------------------
projects / ghc-hetmet.git / blobdiff