X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=compiler%2FbasicTypes%2FUniqSupply.lhs;h=8e3ac96ae540a40317b21584d2618ceb51e45f93;hb=19b0b165a24606dbdb1f4dd7728da7346845a5a0;hp=424dbe25423fa07514e6eac6602899315281e24c;hpb=317fc69d18eda68fd65f5ba634feafbe4a3923da;p=ghc-hetmet.git

diff --git a/compiler/basicTypes/UniqSupply.lhs b/compiler/basicTypes/UniqSupply.lhs
index 424dbe2..8e3ac96 100644
--- a/compiler/basicTypes/UniqSupply.lhs
+++ b/compiler/basicTypes/UniqSupply.lhs
@@ -18,7 +18,7 @@ module UniqSupply (
 	lazyThenUs, lazyMapUs,
 
 	mkSplitUniqSupply,
-	splitUniqSupply
+	splitUniqSupply, listSplitUniqSupply
   ) where
 
 #include "HsVersions.h"
@@ -28,6 +28,13 @@ import Unique
 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#)
@@ -56,6 +63,7 @@ data UniqSupply
 mkSplitUniqSupply :: Char -> IO UniqSupply
 
 splitUniqSupply :: UniqSupply -> (UniqSupply, UniqSupply)
+listSplitUniqSupply :: UniqSupply -> [UniqSupply]   -- Infinite
 uniqFromSupply  :: UniqSupply -> Unique
 uniqsFromSupply :: UniqSupply -> [Unique]	-- Infinite
 \end{code}
@@ -68,7 +76,7 @@ mkSplitUniqSupply (C# c#)
 
 	-- This is one of the most hammered bits in the whole compiler
 	mk_supply#
-	  = unsafeInterleaveIO (
+	  = unsafeDupableInterleaveIO (
 		genSymZh    >>= \ (I# u#) ->
 		mk_supply#  >>= \ s1 ->
 		mk_supply#  >>= \ s2 ->
@@ -80,6 +88,7 @@ mkSplitUniqSupply (C# c#)
 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}