X-Git-Url: http://git.megacz.com/?p=ghc-hetmet.git;a=blobdiff_plain;f=compiler%2FbasicTypes%2FVarSet.lhs;h=e0ff52d6904c958236a88b9d26b9d6f2e1903ea1;hp=d7e85674bf511aa00356e4cf7f95f32e69a8591a;hb=f537dd87c4a07526e2b1fc1bd1c125d652833641;hpb=30c122df62ec75f9ed7f392f24c2925675bf1d06

diff --git a/compiler/basicTypes/VarSet.lhs b/compiler/basicTypes/VarSet.lhs
index d7e8567..e0ff52d 100644
--- a/compiler/basicTypes/VarSet.lhs
+++ b/compiler/basicTypes/VarSet.lhs
@@ -5,21 +5,24 @@
 
 \begin{code}
 module VarSet (
-	VarSet, IdSet, TyVarSet,
+        -- * Var, Id and TyVar set types
+	VarSet, IdSet, TyVarSet, TyCoVarSet, CoVarSet,
+	
+	-- ** Manipulating these sets
 	emptyVarSet, unitVarSet, mkVarSet,
 	extendVarSet, extendVarSetList, extendVarSet_C,
 	elemVarSet, varSetElems, subVarSet,
 	unionVarSet, unionVarSets,
 	intersectVarSet, intersectsVarSet, disjointVarSet,
 	isEmptyVarSet, delVarSet, delVarSetList, delVarSetByKey,
-	minusVarSet, foldVarSet, filterVarSet,
+	minusVarSet, foldVarSet, filterVarSet, fixVarSet,
 	lookupVarSet, mapVarSet, sizeVarSet, seqVarSet,
 	elemVarSetByKey
     ) where
 
 #include "HsVersions.h"
 
-import Var
+import Var      ( Var, TyVar, CoVar, TyCoVar, Id )
 import Unique
 import UniqSet
 \end{code}
@@ -34,6 +37,8 @@ import UniqSet
 type VarSet       = UniqSet Var
 type IdSet 	  = UniqSet Id
 type TyVarSet	  = UniqSet TyVar
+type TyCoVarSet   = UniqSet TyCoVar
+type CoVarSet     = UniqSet CoVar
 
 emptyVarSet	:: VarSet
 intersectVarSet	:: VarSet -> VarSet -> VarSet
@@ -60,6 +65,7 @@ extendVarSet_C  :: (Var->Var->Var) -> VarSet -> Var -> VarSet
 
 delVarSetByKey	:: VarSet -> Unique -> VarSet
 elemVarSetByKey :: Unique -> VarSet -> Bool
+fixVarSet       :: (VarSet -> VarSet) -> VarSet -> VarSet
 
 emptyVarSet	= emptyUniqSet
 unitVarSet	= unitUniqSet
@@ -97,6 +103,12 @@ elemVarSetByKey	= elemUniqSet_Directly
 intersectsVarSet s1 s2 = not (s1 `disjointVarSet` s2)
 disjointVarSet   s1 s2 = isEmptyVarSet (s1 `intersectVarSet` s2)
 subVarSet        s1 s2 = isEmptyVarSet (s1 `minusVarSet` s2)
+
+-- Iterate f to a fixpoint
+fixVarSet f s | new_s `subVarSet` s = s
+	      | otherwise	    = fixVarSet f new_s 
+	      where
+		new_s = f s
 \end{code}
 
 \begin{code}