X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=Foreign%2FPtr.hs;h=a7db56147c065bc25126d5e78f87e527e0387fb6;hb=fb4b15fd8da7e36a2a7aee70fe0b084096f76a1a;hp=bca908bd4ceb3cc4dd73fb2db4d21c0daadea2eb;hpb=7a5cd3c3868a53f1c9b06a98faa37ffcf787b1c0;p=ghc-base.git

diff --git a/Foreign/Ptr.hs b/Foreign/Ptr.hs
index bca908b..a7db561 100644
--- a/Foreign/Ptr.hs
+++ b/Foreign/Ptr.hs
@@ -9,7 +9,7 @@
 -- 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.
 --
@@ -67,6 +67,9 @@ import NHC.FFI
   )
 #endif
 
+#ifdef __HUGS__
+import Hugs.Ptr
+#endif
 
 #ifdef __GLASGOW_HASKELL__
 #include "MachDeps.h"
@@ -76,7 +79,7 @@ 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
@@ -86,6 +89,10 @@ 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