[project @ 1996-12-19 09:10:02 by simonpj]

[ghc-hetmet.git] / ghc / compiler / basicTypes / UniqSupply.lhs

diff --git a/ghc/compiler/basicTypes/UniqSupply.lhs b/ghc/compiler/basicTypes/UniqSupply.lhs
index 7c155f3..5641107 100644 (file)
--- a/ghc/compiler/basicTypes/UniqSupply.lhs
+++ b/ghc/compiler/basicTypes/UniqSupply.lhs
@@ -12,8 +12,8 @@ module UniqSupply (
 
        getUnique, getUniques,  -- basic ops
 
-       UniqSM(..),             -- type: unique supply monad
-       initUs, thenUs, returnUs,
+       SYN_IE(UniqSM),         -- type: unique supply monad
+       initUs, thenUs, returnUs, fixUs,
        mapUs, mapAndUnzipUs, mapAndUnzip3Us,
        thenMaybeUs, mapAccumLUs,
 
@@ -21,13 +21,19 @@ module UniqSupply (
        splitUniqSupply
   ) where
 
-import Ubiq{-uitous-}
+IMP_Ubiq(){-uitous-}
 
 import Unique
 import Util
 
 import PreludeGlaST
 
+#if __GLASGOW_HASKELL__ >= 200
+# define WHASH     GHCbase.W#
+#else
+# define WHASH     W#
+#endif
+
 w2i x = word2Int# x
 i2w x = int2Word# x
 i2w_s x = (x :: Int#)
@@ -67,46 +73,54 @@ getUniques :: Int -> UniqSupply -> [Unique]
 \end{code}
 
 \begin{code}
-mkSplitUniqSupply (MkChar c#)
+mkSplitUniqSupply (C# c#)
   = let
        mask# = (i2w (ord# c#)) `shiftL#` (i2w_s 24#)
 
        -- here comes THE MAGIC:
 
        mk_supply#
-         = unsafe_interleave (
+         = unsafeInterleavePrimIO {-unsafe_interleave-} (
                mk_unique   `thenPrimIO` \ uniq ->
                mk_supply#  `thenPrimIO` \ s1 ->
                mk_supply#  `thenPrimIO` \ s2 ->
                returnPrimIO (MkSplitUniqSupply uniq s1 s2)
            )
          where
+{-
            -- inlined copy of unsafeInterleavePrimIO;
            -- this is the single-most-hammered bit of code
            -- in the compiler....
+           -- Too bad it's not 1.3-portable...
            unsafe_interleave m s
              = let
                    (r, new_s) = m s
                in
                (r, s)
+-}
 
-       mk_unique = _ccall_ genSymZh            `thenPrimIO` \ (W# u#) ->
-                   returnPrimIO (MkInt (w2i (mask# `or#` u#)))
+       mk_unique = _ccall_ genSymZh            `thenPrimIO` \ (WHASH u#) ->
+                   returnPrimIO (I# (w2i (mask# `or#` u#)))
     in
+#if __GLASGOW_HASKELL__ >= 200
+    primIOToIO mk_supply#      >>= \ s ->
+    return s
+#else
     mk_supply# `thenPrimIO` \ s ->
     return s
+#endif
 
 splitUniqSupply (MkSplitUniqSupply _ s1 s2) = (s1, s2)
 \end{code}
 
 \begin{code}
-getUnique (MkSplitUniqSupply (MkInt n) _ _) = mkUniqueGrimily n
+getUnique (MkSplitUniqSupply (I# n) _ _) = mkUniqueGrimily n
 
-getUniques i@(MkInt i#) supply = i# `get_from` supply
+getUniques (I# i) supply = i `get_from` supply
   where
     get_from 0# _ = []
-    get_from n# (MkSplitUniqSupply (MkInt u#) _ s2)
-      = mkUniqueGrimily u# : get_from (n# `minusInt#` 1#) s2
+    get_from n (MkSplitUniqSupply (I# u) _ s2)
+      = mkUniqueGrimily u : get_from (n `minusInt#` 1#) s2
 \end{code}
 
 %************************************************************************
@@ -133,6 +147,10 @@ initUs init_us m
 
 @thenUs@ is where we split the @UniqSupply@.
 \begin{code}
+fixUs :: (a -> UniqSM a) -> UniqSM a
+fixUs m us
+  = r  where  r = m r us
+
 thenUs :: UniqSM a -> (a -> UniqSM b) -> UniqSM b
 
 thenUs expr cont us