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
12 -- $Id: Ptr.hs,v 1.3 2002/02/11 16:11:38 simonmar Exp $
16 -----------------------------------------------------------------------------
19 --------------------------------------------------------------------
22 Ptr(..), -- data Ptr a
24 castPtr, -- :: Ptr a -> Ptr b
25 plusPtr, -- :: Ptr a -> Int -> Ptr b
26 alignPtr, -- :: Ptr a -> Int -> Ptr a
27 minusPtr, -- :: Ptr a -> Ptr b -> Int
29 --------------------------------------------------------------------
32 FunPtr(..), -- data FunPtr a
33 nullFunPtr, -- :: FunPtr a
34 castFunPtr, -- :: FunPtr a -> FunPtr b
35 castFunPtrToPtr, -- :: FunPtr a -> Ptr b
36 castPtrToFunPtr, -- :: Ptr a -> FunPtr b
38 freeHaskellFunPtr, -- :: FunPtr a -> IO ()
39 -- Free the function pointer created by foreign export dynamic.
45 #ifdef __GLASGOW_HASKELL__
59 #ifdef __GLASGOW_HASKELL__
60 #if (WORD_SIZE_IN_BITS == 32 || WORD_SIZE_IN_BITS == 64)
61 instance Show (Ptr a) where
62 showsPrec p (Ptr a) rs = pad_out (showHex (word2Integer(int2Word#(addr2Int# a))) "") rs
64 -- want 0s prefixed to pad it out to a fixed length.
65 pad_out ('0':'x':ls) rs =
66 '0':'x':(replicate (2*SIZEOF_HSPTR - length ls) '0') ++ ls ++ rs
67 -- word2Integer :: Word# -> Integer (stolen from Word.lhs)
68 word2Integer w = case word2Integer# w of
73 foreign import "freeHaskellFunctionPtr" unsafe
74 freeHaskellFunPtr :: FunPtr a -> IO ()
77 INSTANCE_TYPEABLE1(Ptr,ptrTc,"Ptr")