{-# OPTIONS_GHC -fno-implicit-prelude #-}
+{-# OPTIONS_HADDOCK hide #-}
-----------------------------------------------------------------------------
-- |
-- Module : GHC.ForeignPtr
import Control.Monad ( sequence_ )
import Foreign.Storable
-import Numeric ( showHex )
import GHC.Show
-import GHC.Num
-import GHC.List ( null, replicate, length )
+import GHC.List ( null )
import GHC.Base
import GHC.IOBase
import GHC.STRef ( STRef(..) )
-import GHC.Ptr ( Ptr(..), FunPtr, castFunPtrToPtr )
+import GHC.Ptr ( Ptr(..), FunPtr )
import GHC.Err
-- |The type 'ForeignPtr' represents references to objects that are
instance Show (ForeignPtr a) where
showsPrec p f = showsPrec p (unsafeForeignPtrToPtr f)
-#include "MachDeps.h"
-
-#if (WORD_SIZE_IN_BITS == 32 || WORD_SIZE_IN_BITS == 64)
-instance Show (Ptr a) where
- showsPrec p (Ptr a) rs = pad_out (showHex (word2Integer(int2Word#(addr2Int# a))) "") rs
- where
- -- want 0s prefixed to pad it out to a fixed length.
- pad_out ls rs =
- '0':'x':(replicate (2*SIZEOF_HSPTR - length ls) '0') ++ ls ++ rs
- -- word2Integer :: Word# -> Integer (stolen from Word.lhs)
- word2Integer w = case word2Integer# w of
- (# s, d #) -> J# s d
-
-instance Show (FunPtr a) where
- showsPrec p = showsPrec p . castFunPtrToPtr
-#endif
-- |A Finalizer is represented as a pointer to a foreign function that, at
-- finalisation time, gets as an argument a plain pointer variant of the
-- mallocPlainForeignPtr. This is useful for ForeignPtrs that will live
-- only inside Haskell (such as those created for packed strings).
-- Attempts to add a finalizer to a ForeignPtr created this way, or to
--- finalize such a pointer, will have no effect.
+-- finalize such a pointer, will throw an exception.
--
mallocPlainForeignPtr :: Storable a => IO (ForeignPtr a)
mallocPlainForeignPtr = doMalloc undefined
-- | This function is similar to 'mallocForeignPtrBytes', except that
-- the internally an optimised ForeignPtr representation with no
--- finalizer is used.
+-- finalizer is used. Attempts to add a finalizer will cause an
+-- exception to be thrown.
mallocPlainForeignPtrBytes :: Int -> IO (ForeignPtr a)
mallocPlainForeignPtrBytes (I# size) = IO $ \s ->
case newPinnedByteArray# size s of { (# s, mbarr# #) ->