\begin{code}
-{-# OPTIONS -fno-implicit-prelude #-}
+{-# OPTIONS_GHC -fno-implicit-prelude #-}
-----------------------------------------------------------------------------
-- |
-- Module : GHC.Ptr
--
-----------------------------------------------------------------------------
+-- #hide
module GHC.Ptr where
import GHC.Base
+import GHC.Show
+import GHC.Num
+import GHC.List ( length, replicate )
+import Numeric ( showHex )
+
+#include "MachDeps.h"
------------------------------------------------------------------------
-- Data pointers.
-- this assumption.
castPtrToFunPtr :: Ptr a -> FunPtr b
castPtrToFunPtr (Ptr addr) = FunPtr addr
+
+
+------------------------------------------------------------------------
+-- Show instances for Ptr and FunPtr
+-- I have absolutely no idea why the WORD_SIZE_IN_BITS stuff is here
+
+#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
\end{code}