lazyThenUs, lazyMapUs,
mkSplitUniqSupply,
- splitUniqSupply
+ splitUniqSupply, listSplitUniqSupply
) where
#include "HsVersions.h"
import GHC.Exts
import System.IO.Unsafe ( unsafeInterleaveIO )
+#if __GLASGOW_HASKELL__ >= 607
+import GHC.IOBase (unsafeDupableInterleaveIO)
+#else
+unsafeDupableInterleaveIO :: IO a -> IO a
+unsafeDupableInterleaveIO = unsafeInterleaveIO
+#endif
+
w2i x = word2Int# x
i2w x = int2Word# x
i2w_s x = (x :: Int#)
mkSplitUniqSupply :: Char -> IO UniqSupply
splitUniqSupply :: UniqSupply -> (UniqSupply, UniqSupply)
+listSplitUniqSupply :: UniqSupply -> [UniqSupply] -- Infinite
uniqFromSupply :: UniqSupply -> Unique
uniqsFromSupply :: UniqSupply -> [Unique] -- Infinite
\end{code}
\begin{code}
mkSplitUniqSupply (C# c#)
= let
-#if __GLASGOW_HASKELL__ >= 503
mask# = (i2w (ord# c#)) `uncheckedShiftL#` (i2w_s 24#)
-#else
- mask# = (i2w (ord# c#)) `shiftL#` (i2w_s 24#)
-#endif
-- here comes THE MAGIC:
-- This is one of the most hammered bits in the whole compiler
mk_supply#
- = unsafeInterleaveIO (
- genSymZh >>= \ (W# u#) ->
+ = unsafeDupableInterleaveIO (
+ genSymZh >>= \ (I# u#) ->
mk_supply# >>= \ s1 ->
mk_supply# >>= \ s2 ->
- return (MkSplitUniqSupply (w2i (mask# `or#` u#)) s1 s2)
+ return (MkSplitUniqSupply (w2i (mask# `or#` (i2w u#))) s1 s2)
)
in
mk_supply#
-foreign import ccall unsafe "genSymZh" genSymZh :: IO Word
+foreign import ccall unsafe "genSymZh" genSymZh :: IO Int
splitUniqSupply (MkSplitUniqSupply _ s1 s2) = (s1, s2)
+listSplitUniqSupply (MkSplitUniqSupply _ s1 s2) = s1 : listSplitUniqSupply s2
\end{code}
\begin{code}