Commit 2b944de7 authored by simonmar's avatar simonmar
Browse files

[project @ 2002-02-11 16:11:38 by simonmar]

Add missing Show instance for Ptr.
parent 2e98b127
......@@ -9,7 +9,7 @@
-- Stability : provisional
-- Portability : portable
--
-- $Id: Ptr.hs,v 1.2 2001/07/03 11:37:50 simonmar Exp $
-- $Id: Ptr.hs,v 1.3 2002/02/11 16:11:38 simonmar Exp $
--
-- Pointer types.
--
......@@ -46,6 +46,28 @@ import Data.Dynamic
import GHC.Ptr
import GHC.IOBase
import GHC.Err
import GHC.Prim
import GHC.Base
import GHC.Num
import GHC.List
import GHC.Show
import Numeric
#endif
#include "MachDeps.h"
#ifdef __GLASGOW_HASKELL__
#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 =
'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
#endif
foreign import "freeHaskellFunctionPtr" unsafe
......
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