2 % (c) The GRASP/AQUA Project, Glasgow University, 1992-1998
4 \section{@VarSet@: Variable sets}
8 VarSet, IdSet, TyVarSet, IdOrTyVarSet,
9 emptyVarSet, unitVarSet, mkVarSet,
11 elemVarSet, varSetElems,
12 unionVarSet, unionVarSets,
13 intersectVarSet, intersectsVarSet,
14 isEmptyVarSet, delVarSet,
15 minusVarSet, foldVarSet, filterVarSet,
16 lookupVarSet, mapVarSet,
21 #include "HsVersions.h"
23 import Var ( Var, Id, TyVar, IdOrTyVar, setVarUnique )
24 import Unique ( Uniquable(..), incrUnique )
29 %************************************************************************
31 \subsection{@VarSet@s}
33 %************************************************************************
36 type VarSet = UniqSet Var
37 type IdSet = UniqSet Id
38 type TyVarSet = UniqSet TyVar
39 type IdOrTyVarSet = UniqSet IdOrTyVar
42 intersectVarSet :: VarSet -> VarSet -> VarSet
43 intersectsVarSet:: VarSet -> VarSet -> Bool -- True if non-empty intersection
44 unionVarSet :: VarSet -> VarSet -> VarSet
45 unionVarSets :: [VarSet] -> VarSet
46 varSetElems :: VarSet -> [Var]
47 unitVarSet :: Var -> VarSet
48 extendVarSet :: VarSet -> Var -> VarSet
49 elemVarSet :: Var -> VarSet -> Bool
50 delVarSet :: VarSet -> Var -> VarSet
51 minusVarSet :: VarSet -> VarSet -> VarSet
52 isEmptyVarSet :: VarSet -> Bool
53 mkVarSet :: [Var] -> VarSet
54 foldVarSet :: (Var -> a -> a) -> a -> VarSet -> a
55 lookupVarSet :: VarSet -> Var -> Maybe Var
56 -- Returns the set element, which may be
57 -- (==) to the argument, but not the same as
58 mapVarSet :: (Var -> Var) -> VarSet -> VarSet
59 filterVarSet :: (Var -> Bool) -> VarSet -> VarSet
61 emptyVarSet = emptyUniqSet
62 unitVarSet = unitUniqSet
63 extendVarSet = addOneToUniqSet
64 intersectVarSet = intersectUniqSets
65 intersectsVarSet s1 s2 = not (isEmptyVarSet (s1 `intersectVarSet` s2))
66 unionVarSet = unionUniqSets
67 unionVarSets = unionManyUniqSets
68 varSetElems = uniqSetToList
69 elemVarSet = elementOfUniqSet
70 minusVarSet = minusUniqSet
71 delVarSet = delOneFromUniqSet
72 isEmptyVarSet = isEmptyUniqSet
74 foldVarSet = foldUniqSet
75 lookupVarSet = lookupUniqSet
76 mapVarSet = mapUniqSet
77 filterVarSet = filterUniqSet
81 uniqAway :: VarSet -> Var -> Var
82 -- Give the Var a new unique, different to any in the VarSet
84 = try 1 (incrUnique (getUnique var))
86 try n uniq | uniq `elemUniqSet_Directly` set = try ((n+1)::Int) (incrUnique uniq)
87 | otherwise = {- pprTrace "uniqAway:" (ppr n <+> text "tries") -}