{-# LANGUAGE MultiParamTypeClasses, FlexibleInstances, ScopedTypeVariables #-} -- | -- Module : Data.Vector.Storable.Mutable -- Copyright : (c) Roman Leshchinskiy 2009-2010 -- License : BSD-style -- -- Maintainer : Roman Leshchinskiy <rl@cse.unsw.edu.au> -- Stability : experimental -- Portability : non-portable -- -- Mutable vectors based on Storable. -- module Data.Vector.Storable.Mutable( -- * Mutable vectors of 'Storable' types MVector(..), IOVector, STVector, Storable, -- * Accessors -- ** Length information length, null, -- ** Extracting subvectors slice, init, tail, take, drop, splitAt, unsafeSlice, unsafeInit, unsafeTail, unsafeTake, unsafeDrop, -- ** Overlapping overlaps, -- * Construction -- ** Initialisation new, unsafeNew, replicate, replicateM, clone, -- ** Growing grow, unsafeGrow, -- ** Restricting memory usage clear, -- * Accessing individual elements read, write, swap, unsafeRead, unsafeWrite, unsafeSwap, -- * Modifying vectors -- ** Filling and copying set, copy, move, unsafeCopy, unsafeMove, -- * Unsafe conversions unsafeCast, -- * Raw pointers unsafeFromForeignPtr, unsafeFromForeignPtr0, unsafeToForeignPtr, unsafeToForeignPtr0, unsafeWith ) where import qualified Data.Vector.Generic.Mutable as G import Data.Vector.Storable.Internal import Foreign.Storable import Foreign.ForeignPtr #if __GLASGOW_HASKELL__ >= 605 import GHC.ForeignPtr (mallocPlainForeignPtrBytes) #endif import Foreign.Ptr import Foreign.Marshal.Array ( advancePtr, copyArray, moveArray ) import Foreign.C.Types ( CInt ) import Control.Monad.Primitive import Prelude hiding ( length, null, replicate, reverse, map, read, take, drop, splitAt, init, tail ) import Data.Typeable ( Typeable ) #include "vector.h" -- | Mutable 'Storable'-based vectors data MVector s a = MVector {-# UNPACK #-} !Int {-# UNPACK #-} !(ForeignPtr a) deriving ( Typeable ) type IOVector = MVector RealWorld type STVector s = MVector s instance Storable a => G.MVector MVector a where {-# INLINE basicLength #-} basicLength (MVector n _) = n {-# INLINE basicUnsafeSlice #-} basicUnsafeSlice j m (MVector n fp) = MVector m (updPtr (`advancePtr` j) fp) -- FIXME: this relies on non-portable pointer comparisons {-# INLINE basicOverlaps #-} basicOverlaps (MVector m fp) (MVector n fq) = between p q (q `advancePtr` n) || between q p (p `advancePtr` m) where between x y z = x >= y && x < z p = getPtr fp q = getPtr fq {-# INLINE basicUnsafeNew #-} basicUnsafeNew n = unsafePrimToPrim $ do fp <- mallocVector n return $ MVector n fp {-# INLINE basicUnsafeRead #-} basicUnsafeRead (MVector _ fp) i = unsafePrimToPrim $ withForeignPtr fp (`peekElemOff` i) {-# INLINE basicUnsafeWrite #-} basicUnsafeWrite (MVector _ fp) i x = unsafePrimToPrim $ withForeignPtr fp $ \p -> pokeElemOff p i x {-# INLINE basicUnsafeCopy #-} basicUnsafeCopy (MVector n fp) (MVector _ fq) = unsafePrimToPrim $ withForeignPtr fp $ \p -> withForeignPtr fq $ \q -> copyArray p q n {-# INLINE basicUnsafeMove #-} basicUnsafeMove (MVector n fp) (MVector _ fq) = unsafePrimToPrim $ withForeignPtr fp $ \p -> withForeignPtr fq $ \q -> moveArray p q n {-# INLINE mallocVector #-} mallocVector :: Storable a => Int -> IO (ForeignPtr a) mallocVector = #if __GLASGOW_HASKELL__ >= 605 doMalloc undefined where doMalloc :: Storable b => b -> Int -> IO (ForeignPtr b) doMalloc dummy size = mallocPlainForeignPtrBytes (size * sizeOf dummy) #else mallocForeignPtrArray #endif -- Length information -- ------------------ -- | Length of the mutable vector. length :: Storable a => MVector s a -> Int {-# INLINE length #-} length = G.length -- | Check whether the vector is empty null :: Storable a => MVector s a -> Bool {-# INLINE null #-} null = G.null -- Extracting subvectors -- --------------------- -- | Yield a part of the mutable vector without copying it. slice :: Storable a => Int -> Int -> MVector s a -> MVector s a {-# INLINE slice #-} slice = G.slice take :: Storable a => Int -> MVector s a -> MVector s a {-# INLINE take #-} take = G.take drop :: Storable a => Int -> MVector s a -> MVector s a {-# INLINE drop #-} drop = G.drop splitAt :: Storable a => Int -> MVector s a -> (MVector s a, MVector s a) {-# INLINE splitAt #-} splitAt = G.splitAt init :: Storable a => MVector s a -> MVector s a {-# INLINE init #-} init = G.init tail :: Storable a => MVector s a -> MVector s a {-# INLINE tail #-} tail = G.tail -- | Yield a part of the mutable vector without copying it. No bounds checks -- are performed. unsafeSlice :: Storable a => Int -- ^ starting index -> Int -- ^ length of the slice -> MVector s a -> MVector s a {-# INLINE unsafeSlice #-} unsafeSlice = G.unsafeSlice unsafeTake :: Storable a => Int -> MVector s a -> MVector s a {-# INLINE unsafeTake #-} unsafeTake = G.unsafeTake unsafeDrop :: Storable a => Int -> MVector s a -> MVector s a {-# INLINE unsafeDrop #-} unsafeDrop = G.unsafeDrop unsafeInit :: Storable a => MVector s a -> MVector s a {-# INLINE unsafeInit #-} unsafeInit = G.unsafeInit unsafeTail :: Storable a => MVector s a -> MVector s a {-# INLINE unsafeTail #-} unsafeTail = G.unsafeTail -- Overlapping -- ----------- -- Check whether two vectors overlap. overlaps :: Storable a => MVector s a -> MVector s a -> Bool {-# INLINE overlaps #-} overlaps = G.overlaps -- Initialisation -- -------------- -- | Create a mutable vector of the given length. new :: (PrimMonad m, Storable a) => Int -> m (MVector (PrimState m) a) {-# INLINE new #-} new = G.new -- | Create a mutable vector of the given length. The length is not checked. unsafeNew :: (PrimMonad m, Storable a) => Int -> m (MVector (PrimState m) a) {-# INLINE unsafeNew #-} unsafeNew = G.unsafeNew -- | Create a mutable vector of the given length (0 if the length is negative) -- and fill it with an initial value. replicate :: (PrimMonad m, Storable a) => Int -> a -> m (MVector (PrimState m) a) {-# INLINE replicate #-} replicate = G.replicate -- | Create a mutable vector of the given length (0 if the length is negative) -- and fill it with values produced by repeatedly executing the monadic action. replicateM :: (PrimMonad m, Storable a) => Int -> m a -> m (MVector (PrimState m) a) {-# INLINE replicateM #-} replicateM = G.replicateM -- | Create a copy of a mutable vector. clone :: (PrimMonad m, Storable a) => MVector (PrimState m) a -> m (MVector (PrimState m) a) {-# INLINE clone #-} clone = G.clone -- Growing -- ------- -- | Grow a vector by the given number of elements. The number must be -- positive. grow :: (PrimMonad m, Storable a) => MVector (PrimState m) a -> Int -> m (MVector (PrimState m) a) {-# INLINE grow #-} grow = G.grow -- | Grow a vector by the given number of elements. The number must be -- positive but this is not checked. unsafeGrow :: (PrimMonad m, Storable a) => MVector (PrimState m) a -> Int -> m (MVector (PrimState m) a) {-# INLINE unsafeGrow #-} unsafeGrow = G.unsafeGrow -- Restricting memory usage -- ------------------------ -- | Reset all elements of the vector to some undefined value, clearing all -- references to external objects. This is usually a noop for unboxed vectors. clear :: (PrimMonad m, Storable a) => MVector (PrimState m) a -> m () {-# INLINE clear #-} clear = G.clear -- Accessing individual elements -- ----------------------------- -- | Yield the element at the given position. read :: (PrimMonad m, Storable a) => MVector (PrimState m) a -> Int -> m a {-# INLINE read #-} read = G.read -- | Replace the element at the given position. write :: (PrimMonad m, Storable a) => MVector (PrimState m) a -> Int -> a -> m () {-# INLINE write #-} write = G.write -- | Swap the elements at the given positions. swap :: (PrimMonad m, Storable a) => MVector (PrimState m) a -> Int -> Int -> m () {-# INLINE swap #-} swap = G.swap -- | Yield the element at the given position. No bounds checks are performed. unsafeRead :: (PrimMonad m, Storable a) => MVector (PrimState m) a -> Int -> m a {-# INLINE unsafeRead #-} unsafeRead = G.unsafeRead -- | Replace the element at the given position. No bounds checks are performed. unsafeWrite :: (PrimMonad m, Storable a) => MVector (PrimState m) a -> Int -> a -> m () {-# INLINE unsafeWrite #-} unsafeWrite = G.unsafeWrite -- | Swap the elements at the given positions. No bounds checks are performed. unsafeSwap :: (PrimMonad m, Storable a) => MVector (PrimState m) a -> Int -> Int -> m () {-# INLINE unsafeSwap #-} unsafeSwap = G.unsafeSwap -- Filling and copying -- ------------------- -- | Set all elements of the vector to the given value. set :: (PrimMonad m, Storable a) => MVector (PrimState m) a -> a -> m () {-# INLINE set #-} set = G.set -- | Copy a vector. The two vectors must have the same length and may not -- overlap. copy :: (PrimMonad m, Storable a) => MVector (PrimState m) a -> MVector (PrimState m) a -> m () {-# INLINE copy #-} copy = G.copy -- | Copy a vector. The two vectors must have the same length and may not -- overlap. This is not checked. unsafeCopy :: (PrimMonad m, Storable a) => MVector (PrimState m) a -- ^ target -> MVector (PrimState m) a -- ^ source -> m () {-# INLINE unsafeCopy #-} unsafeCopy = G.unsafeCopy -- | Move the contents of a vector. The two vectors must have the same -- length. -- -- If the vectors do not overlap, then this is equivalent to 'copy'. -- Otherwise, the copying is performed as if the source vector were -- copied to a temporary vector and then the temporary vector was copied -- to the target vector. move :: (PrimMonad m, Storable a) => MVector (PrimState m) a -> MVector (PrimState m) a -> m () {-# INLINE move #-} move = G.move -- | Move the contents of a vector. The two vectors must have the same -- length, but this is not checked. -- -- If the vectors do not overlap, then this is equivalent to 'unsafeCopy'. -- Otherwise, the copying is performed as if the source vector were -- copied to a temporary vector and then the temporary vector was copied -- to the target vector. unsafeMove :: (PrimMonad m, Storable a) => MVector (PrimState m) a -- ^ target -> MVector (PrimState m) a -- ^ source -> m () {-# INLINE unsafeMove #-} unsafeMove = G.unsafeMove -- Unsafe conversions -- ------------------ -- | /O(1)/ Unsafely cast a mutable vector from one element type to another. -- The operation just changes the type of the underlying pointer and does not -- modify the elements. -- -- The resulting vector contains as many elements as can fit into the -- underlying memory block. -- unsafeCast :: forall a b s. (Storable a, Storable b) => MVector s a -> MVector s b {-# INLINE unsafeCast #-} unsafeCast (MVector n fp) = MVector ((n * sizeOf (undefined :: a)) `div` sizeOf (undefined :: b)) (castForeignPtr fp) -- Raw pointers -- ------------ -- | Create a mutable vector from a 'ForeignPtr' with an offset and a length. -- -- Modifying data through the 'ForeignPtr' afterwards is unsafe if the vector -- could have been frozen before the modification. -- -- If your offset is 0 it is more efficient to use 'unsafeFromForeignPtr0'. unsafeFromForeignPtr :: Storable a => ForeignPtr a -- ^ pointer -> Int -- ^ offset -> Int -- ^ length -> MVector s a {-# INLINE unsafeFromForeignPtr #-} unsafeFromForeignPtr fp i n = unsafeFromForeignPtr0 fp' n where fp' = updPtr (`advancePtr` i) fp {-# RULES "unsafeFromForeignPtr fp 0 n -> unsafeFromForeignPtr0 fp n " forall fp n. unsafeFromForeignPtr fp 0 n = unsafeFromForeignPtr0 fp n #-} -- | /O(1)/ Create a mutable vector from a 'ForeignPtr' and a length. -- -- It is assumed the pointer points directly to the data (no offset). -- Use `unsafeFromForeignPtr` if you need to specify an offset. -- -- Modifying data through the 'ForeignPtr' afterwards is unsafe if the vector -- could have been frozen before the modification. unsafeFromForeignPtr0 :: Storable a => ForeignPtr a -- ^ pointer -> Int -- ^ length -> MVector s a {-# INLINE unsafeFromForeignPtr0 #-} unsafeFromForeignPtr0 fp n = MVector n fp -- | Yield the underlying 'ForeignPtr' together with the offset to the data -- and its length. Modifying the data through the 'ForeignPtr' is -- unsafe if the vector could have frozen before the modification. unsafeToForeignPtr :: Storable a => MVector s a -> (ForeignPtr a, Int, Int) {-# INLINE unsafeToForeignPtr #-} unsafeToForeignPtr (MVector n fp) = (fp, 0, n) -- | /O(1)/ Yield the underlying 'ForeignPtr' together with its length. -- -- You can assume the pointer points directly to the data (no offset). -- -- Modifying the data through the 'ForeignPtr' is unsafe if the vector could -- have frozen before the modification. unsafeToForeignPtr0 :: Storable a => MVector s a -> (ForeignPtr a, Int) {-# INLINE unsafeToForeignPtr0 #-} unsafeToForeignPtr0 (MVector n fp) = (fp, n) -- | Pass a pointer to the vector's data to the IO action. Modifying data -- through the pointer is unsafe if the vector could have been frozen before -- the modification. unsafeWith :: Storable a => IOVector a -> (Ptr a -> IO b) -> IO b {-# INLINE unsafeWith #-} unsafeWith (MVector n fp) = withForeignPtr fp