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{-# LANGUAGE MagicHash, UnboxedTuples, ScopedTypeVariables #-}
module Main where
import GHC.Prim
import GHC.Base
import GHC.ST
import GHC.Word
import Control.Monad
import System.Mem
data MutableByteArray s = MutableByteArray (MutableByteArray# s)
data ByteArray e = ByteArray ByteArray#
newByteArray :: Int -> ST s (MutableByteArray s)
newByteArray (I# n#)
= ST $ \s# -> case newByteArray# n# s# of
(# s'#, arr# #) -> (# s'#, MutableByteArray arr# #)
writeByteArray :: MutableByteArray s -> Int -> Word32 -> ST s ()
writeByteArray (MutableByteArray mba#) (I# i#) (W32# w#)
= ST $ \s# -> case writeWord32Array# mba# i# (extendWord32# w#) s# of
s'# -> (# s'#, () #)
indexArray :: ByteArray Word32 -> Int -> Word32
indexArray (ByteArray arr#) (I# i#)
= W32# (narrowWord32# (indexWord32Array# arr# i#))
unsafeFreezeByteArray :: MutableByteArray s -> ST s (ByteArray e)
unsafeFreezeByteArray (MutableByteArray mba#)
= ST $ \s# -> case unsafeFreezeByteArray# mba# s# of
(# s'#, ba# #) -> (# s'#, ByteArray ba# #)
data MutableArrayArray s e = MutableArrayArray (MutableArrayArray# s)
data ArrayArray e = ArrayArray ArrayArray#
newArrayArray :: Int -> ST s (MutableArrayArray s e)
newArrayArray (I# n#)
= ST $ \s# -> case newArrayArray# n# s# of
(# s'#, arr# #) -> (# s'#, MutableArrayArray arr# #)
writeArrayArrayMut :: MutableArrayArray s (MutableByteArray s) -> Int -> MutableByteArray s
-> ST s ()
writeArrayArrayMut (MutableArrayArray arrs#) (I# i#) (MutableByteArray mba#)
= ST $ \s# -> case writeMutableByteArrayArray# arrs# i# mba# s# of
s'# -> (# s'#, () #)
writeArrayArray :: MutableArrayArray s (ByteArray s) -> Int -> ByteArray s
-> ST s ()
writeArrayArray (MutableArrayArray arrs#) (I# i#) (ByteArray ba#)
= ST $ \s# -> case writeByteArrayArray# arrs# i# ba# s# of
s'# -> (# s'#, () #)
readArrayArray :: MutableArrayArray s (MutableByteArray s) -> Int -> ST s (MutableByteArray s)
readArrayArray (MutableArrayArray arrs#) (I# i#)
= ST $ \s# -> case readMutableByteArrayArray# arrs# i# s# of
(# s'#, mba# #) -> (# s'#, MutableByteArray mba# #)
indexArrayArray :: ArrayArray (ByteArray e) -> Int -> ByteArray e
indexArrayArray (ArrayArray arrs#) (I# i#)
= ByteArray (indexByteArrayArray# arrs# i#)
unsafeFreezeArrayArray :: MutableArrayArray s e -> ST s (ArrayArray e)
unsafeFreezeArrayArray (MutableArrayArray marrs#)
= ST $ \s# -> case unsafeFreezeArrayArray# marrs# s# of
(# s'#, arrs# #) -> (# s'#, ArrayArray arrs# #)
unsafeDeepFreezeArrayArray :: forall s e
. MutableArrayArray s (MutableByteArray s)
-> ST s (ArrayArray (ByteArray e))
unsafeDeepFreezeArrayArray marrs@(MutableArrayArray marrs#)
= do { let n = I# (sizeofMutableArrayArray# marrs#)
marrs_halfFrozen = MutableArrayArray marrs# -- :: MutableArrayArray s (ByteArray e)
; mapM_ (freezeSubArray marrs_halfFrozen) [0..n - 1]
; unsafeFreezeArrayArray marrs_halfFrozen
}
where
freezeSubArray marrs_halfFrozen i
= do { mba <- readArrayArray marrs i
; ba <- unsafeFreezeByteArray mba
; writeArrayArray marrs_halfFrozen i ba
}
newByteArrays :: [Int] -> ST s (MutableArrayArray s (MutableByteArray s))
newByteArrays ns
= do { arrs <- newArrayArray (length ns)
; zipWithM_ (writeNewByteArray arrs) ns [0..]
; return arrs
}
where
writeNewByteArray arrs n i
= do { mba <- newByteArray (n * 4) -- we store 32-bit words
; writeArrayArrayMut arrs i mba
}
type UnboxedArray2D e = ArrayArray (ByteArray e)
newUnboxedArray2D :: [[Word32]] -> UnboxedArray2D Word32
newUnboxedArray2D values
= runST $
do { marrs <- newByteArrays (map length values)
; zipWithM_ (fill marrs) values [0..]
; arrs <- unsafeDeepFreezeArrayArray marrs
; return arrs
}
where
fill marrs vs i
= do { mba <- readArrayArray marrs i
; zipWithM_ (writeByteArray mba) [0..] vs
}
unboxedArray2D :: UnboxedArray2D Word32
unboxedArray2D
= newUnboxedArray2D
[ [1..10]
, [11..200]
, []
, [1..1000] ++ [42] ++ [1001..2000]
, [1..100000]
]
indexUnboxedArray2D :: UnboxedArray2D Word32 -> (Int, Int) -> Word32
indexUnboxedArray2D arr (i, j)
= indexArrayArray arr i `indexArray` j
main
= do { print $ unboxedArray2D `indexUnboxedArray2D` (3, 1000)
; performGC
; print $ unboxedArray2D `indexUnboxedArray2D` (3, 1000)
}
|
