2 #include "HsVersions.h"
5 GenTyVar(..), SYN_IE(TyVar),
7 tyVarKind, -- TyVar -> Kind
11 alphaTyVars, alphaTyVar, betaTyVar, gammaTyVar, deltaTyVar,
13 -- We also export "environments" keyed off of
14 -- TyVars and "sets" containing TyVars:
16 nullTyVarEnv, mkTyVarEnv, addOneToTyVarEnv,
17 growTyVarEnvList, isNullTyVarEnv, lookupTyVarEnv, delFromTyVarEnv,
19 SYN_IE(GenTyVarSet), SYN_IE(TyVarSet),
20 emptyTyVarSet, unitTyVarSet, unionTyVarSets,
21 unionManyTyVarSets, intersectTyVarSets, mkTyVarSet,
22 tyVarSetToList, elementOfTyVarSet, minusTyVarSet,
26 CHK_Ubiq() -- debugging consistency check
29 import Usage ( GenUsage, SYN_IE(Usage), usageOmega )
30 import Kind ( Kind, mkBoxedTypeKind, mkTypeKind )
33 import UniqSet -- nearly all of it
34 import UniqFM ( emptyUFM, listToUFM, addToUFM, lookupUFM,
35 plusUFM, sizeUFM, delFromUFM, UniqFM
37 import Name ( mkSysLocalName, changeUnique, Name, NamedThing(..) )
38 import Pretty ( Doc, (<>), ptext )
39 import Outputable ( PprStyle(..), Outputable(..) )
40 import SrcLoc ( noSrcLoc, SrcLoc )
41 import Unique ( showUnique, mkAlphaTyVarUnique, Unique )
42 import UniqFM ( Uniquable(..) )
43 import Util ( panic, Ord3(..) )
47 data GenTyVar flexi_slot
51 (Maybe Name) -- User name (if any)
52 flexi_slot -- Extra slot used during type and usage
53 -- inference, and to contain usages.
55 type TyVar = GenTyVar Usage -- Usage slot makes sense only if Kind = Type
59 Simple construction and analysis functions
60 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
62 mkTyVar :: Name -> Kind -> TyVar
63 mkTyVar name kind = TyVar (uniqueOf name)
68 mkSysTyVar :: Unique -> Kind -> TyVar
69 mkSysTyVar uniq kind = TyVar uniq
74 tyVarKind :: GenTyVar flexi -> Kind
75 tyVarKind (TyVar _ kind _ _) = kind
77 cloneTyVar :: GenTyVar flexi -> Unique -> GenTyVar flexi
78 cloneTyVar (TyVar _ k n x) u = TyVar u k n x
82 Fixed collection of type variables
83 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
85 -- openAlphaTyVar is prepared to be instantiated
86 -- to a boxed or unboxed type variable. It's used for the
87 -- result type for "error", so that we can have (error Int# "Help")
88 openAlphaTyVar = TyVar (mkAlphaTyVarUnique 1) mkTypeKind Nothing usageOmega
90 alphaTyVars = [ TyVar u mkBoxedTypeKind Nothing usageOmega
91 | u <- map mkAlphaTyVarUnique [2..] ]
93 (alphaTyVar:betaTyVar:gammaTyVar:deltaTyVar:_) = alphaTyVars
101 type TyVarEnv elt = UniqFM elt
103 nullTyVarEnv :: TyVarEnv a
104 mkTyVarEnv :: [(GenTyVar flexi, a)] -> TyVarEnv a
105 addOneToTyVarEnv :: TyVarEnv a -> GenTyVar flexi -> a -> TyVarEnv a
106 growTyVarEnvList :: TyVarEnv a -> [(GenTyVar flexi, a)] -> TyVarEnv a
107 isNullTyVarEnv :: TyVarEnv a -> Bool
108 lookupTyVarEnv :: TyVarEnv a -> GenTyVar flexi -> Maybe a
109 delFromTyVarEnv :: TyVarEnv a -> GenTyVar flexi -> TyVarEnv a
111 nullTyVarEnv = emptyUFM
112 mkTyVarEnv = listToUFM
113 addOneToTyVarEnv = addToUFM
114 lookupTyVarEnv = lookupUFM
115 delFromTyVarEnv = delFromUFM
117 growTyVarEnvList env pairs = plusUFM env (listToUFM pairs)
118 isNullTyVarEnv env = sizeUFM env == 0
124 type GenTyVarSet flexi = UniqSet (GenTyVar flexi)
125 type TyVarSet = UniqSet TyVar
127 emptyTyVarSet :: GenTyVarSet flexi
128 intersectTyVarSets:: GenTyVarSet flexi -> GenTyVarSet flexi -> GenTyVarSet flexi
129 unionTyVarSets :: GenTyVarSet flexi -> GenTyVarSet flexi -> GenTyVarSet flexi
130 unionManyTyVarSets:: [GenTyVarSet flexi] -> GenTyVarSet flexi
131 tyVarSetToList :: GenTyVarSet flexi -> [GenTyVar flexi]
132 unitTyVarSet :: GenTyVar flexi -> GenTyVarSet flexi
133 elementOfTyVarSet :: GenTyVar flexi -> GenTyVarSet flexi -> Bool
134 minusTyVarSet :: GenTyVarSet flexi -> GenTyVarSet flexi -> GenTyVarSet flexi
135 isEmptyTyVarSet :: GenTyVarSet flexi -> Bool
136 mkTyVarSet :: [GenTyVar flexi] -> GenTyVarSet flexi
138 emptyTyVarSet = emptyUniqSet
139 unitTyVarSet = unitUniqSet
140 intersectTyVarSets= intersectUniqSets
141 unionTyVarSets = unionUniqSets
142 unionManyTyVarSets= unionManyUniqSets
143 tyVarSetToList = uniqSetToList
144 elementOfTyVarSet = elementOfUniqSet
145 minusTyVarSet = minusUniqSet
146 isEmptyTyVarSet = isEmptyUniqSet
147 mkTyVarSet = mkUniqSet
153 instance Eq (GenTyVar a) where
154 (TyVar u1 _ _ _) == (TyVar u2 _ _ _) = u1 == u2
156 instance Ord3 (GenTyVar a) where
157 cmp (TyVar u1 _ _ _) (TyVar u2 _ _ _) = u1 `cmp` u2
159 instance Uniquable (GenTyVar a) where
160 uniqueOf (TyVar u _ _ _) = u
162 instance NamedThing (GenTyVar a) where
163 getName (TyVar _ _ (Just n) _) = n
164 getName (TyVar u _ _ _) = mkSysLocalName u SLIT("t") noSrcLoc