[project @ 2005-01-27 10:45:47 by simonpj]

[ghc-base.git] / Foreign / Ptr.hs

diff --git a/Foreign/Ptr.hs b/Foreign/Ptr.hs
index 4cf8700..ad20da4 100644 (file)
--- a/Foreign/Ptr.hs
+++ b/Foreign/Ptr.hs
@@ -1,15 +1,15 @@
-{-# OPTIONS -fno-implicit-prelude #-}
+{-# OPTIONS_GHC -fno-implicit-prelude #-}
 -----------------------------------------------------------------------------
 -- |
 -- Module      :  Foreign.Ptr
 -- Copyright   :  (c) The FFI task force 2001
--- License     :  BSD-style (see the file libraries/core/LICENSE)
+-- License     :  BSD-style (see the file libraries/base/LICENSE)
 -- 
 -- Maintainer  :  ffi@haskell.org
 -- Stability   :  provisional
 -- Portability :  portable
 --
--- The "Ptr" module provides typed pointers to foreign data.  It is part
+-- This module provides typed pointers to foreign data.  It is part
 -- of the Foreign Function Interface (FFI) and will normally be
 -- imported via the "Foreign" module.
 --
@@ -42,7 +42,6 @@ module Foreign.Ptr (
 #ifdef __GLASGOW_HASKELL__
 import GHC.Ptr
 import GHC.IOBase
-import GHC.Err
 import GHC.Base
 import GHC.Num
 import GHC.List
@@ -50,21 +49,49 @@ import GHC.Show
 import Numeric
 #endif
 
-#include "MachDeps.h"
+#ifdef __NHC__
+import NHC.FFI
+  ( Ptr
+  , nullPtr
+  , castPtr
+  , plusPtr
+  , alignPtr
+  , minusPtr
+  , FunPtr
+  , nullFunPtr
+  , castFunPtr
+  , castFunPtrToPtr
+  , castPtrToFunPtr
+  , freeHaskellFunPtr
+  )
+#endif
+
+#ifdef __HUGS__
+import Hugs.Ptr
+#endif
 
 #ifdef __GLASGOW_HASKELL__
+#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 ('0':'x':ls) rs = 
+       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
-#endif
+
+instance Show (FunPtr a) where
+   showsPrec p = showsPrec p . castFunPtrToPtr
 #endif
 
+-- | Release the storage associated with the given 'FunPtr', which
+-- must have been obtained from a wrapper stub.  This should be called
+-- whenever the return value from a foreign import wrapper function is
+-- no longer required; otherwise, the storage it uses will leak.
 foreign import ccall unsafe "freeHaskellFunctionPtr"
     freeHaskellFunPtr :: FunPtr a -> IO ()
+#endif