1 {-# OPTIONS -fno-implicit-prelude #-}
2 -----------------------------------------------------------------------------
4 -- Module : Foreign.Ptr
5 -- Copyright : (c) The FFI task force 2001
6 -- License : BSD-style (see the file libraries/core/LICENSE)
8 -- Maintainer : ffi@haskell.org
9 -- Stability : provisional
10 -- Portability : portable
14 -----------------------------------------------------------------------------
17 --------------------------------------------------------------------
20 Ptr(..), -- data Ptr a
22 castPtr, -- :: Ptr a -> Ptr b
23 plusPtr, -- :: Ptr a -> Int -> Ptr b
24 alignPtr, -- :: Ptr a -> Int -> Ptr a
25 minusPtr, -- :: Ptr a -> Ptr b -> Int
27 --------------------------------------------------------------------
30 FunPtr(..), -- data FunPtr a
31 nullFunPtr, -- :: FunPtr a
32 castFunPtr, -- :: FunPtr a -> FunPtr b
33 castFunPtrToPtr, -- :: FunPtr a -> Ptr b
34 castPtrToFunPtr, -- :: Ptr a -> FunPtr b
36 freeHaskellFunPtr, -- :: FunPtr a -> IO ()
37 -- Free the function pointer created by foreign export dynamic.
41 #ifdef __GLASGOW_HASKELL__
54 #ifdef __GLASGOW_HASKELL__
55 #if (WORD_SIZE_IN_BITS == 32 || WORD_SIZE_IN_BITS == 64)
56 instance Show (Ptr a) where
57 showsPrec p (Ptr a) rs = pad_out (showHex (word2Integer(int2Word#(addr2Int# a))) "") rs
59 -- want 0s prefixed to pad it out to a fixed length.
60 pad_out ('0':'x':ls) rs =
61 '0':'x':(replicate (2*SIZEOF_HSPTR - length ls) '0') ++ ls ++ rs
62 -- word2Integer :: Word# -> Integer (stolen from Word.lhs)
63 word2Integer w = case word2Integer# w of
68 foreign import ccall unsafe "freeHaskellFunctionPtr"
69 freeHaskellFunPtr :: FunPtr a -> IO ()