\begin{code}
-#include "HsVersions.h"
-
module TcEnv(
+ TcIdOcc(..), TcIdBndr, tcIdType, tcIdTyVars, tcInstId,
+
TcEnv,
initEnv, getEnv_LocalIds, getEnv_TyCons, getEnv_Classes,
- tcTyVarScope, tcTyVarScopeGivenKinds, tcLookupTyVar,
+ tcExtendTyVarEnv, tcLookupTyVar,
tcExtendTyConEnv, tcLookupTyCon, tcLookupTyConByKey,
tcExtendClassEnv, tcLookupClass, tcLookupClassByKey,
tcExtendGlobalValEnv, tcExtendLocalValEnv,
tcLookupLocalValue, tcLookupLocalValueOK, tcLookupLocalValueByKey,
- tcLookupGlobalValue, tcLookupGlobalValueByKey,
+ tcLookupGlobalValue, tcLookupGlobalValueByKey, tcLookupGlobalValueMaybe,
+ tcAddImportedIdInfo, tcExplicitLookupGlobal,
+ tcLookupGlobalValueByKeyMaybe,
newMonoIds, newLocalIds, newLocalId,
- tcGetGlobalTyVars
+ tcGetGlobalTyVars, tcExtendGlobalTyVars
) where
+#include "HsVersions.h"
-IMP_Ubiq()
-IMPORT_DELOOPER(TcMLoop) -- for paranoia checking
-
-import Id ( Id(..), GenId, idType, mkUserLocal )
-import TcHsSyn ( TcIdBndr(..), TcIdOcc(..) )
-import TcKind ( TcKind, newKindVars, tcDefaultKind, kindToTcKind )
-import TcType ( TcType(..), TcMaybe, TcTyVar(..), TcTyVarSet(..),
- newTyVarTys, tcInstTyVars, zonkTcTyVars
+import MkId ( mkUserLocal, mkUserId )
+import Id ( Id, GenId, idType, replaceIdInfo, idInfo )
+import TcKind ( TcKind, kindToTcKind, Kind )
+import TcType ( TcType, TcMaybe, TcTyVar, TcTyVarSet, TcThetaType,
+ newTyVarTys, tcInstTyVars, zonkTcTyVars, tcInstType
)
-import TyVar ( mkTyVar, tyVarKind, unionTyVarSets, emptyTyVarSet )
-import Type ( tyVarsOfTypes )
-import TyCon ( TyCon, tyConKind, synTyConArity )
-import Class ( Class(..), GenClass, classSig )
-
-import TcMonad hiding ( rnMtoTcM )
-
-import Name ( getOccName, getSrcLoc, Name{-instance NamedThing-} )
-import PprStyle
-import Pretty
-import RnHsSyn ( RnName(..) )
-import Type ( splitForAllTy )
-import Unique ( pprUnique10, pprUnique{-ToDo:rm-} )
-import UniqFM
-import Util ( zipEqual, zipWithEqual, zipWith3Equal, zipLazy,
- panic, pprPanic, pprTrace{-ToDo:rm-}
+import TyVar ( mkTyVarSet, unionTyVarSets, emptyTyVarSet, TyVar )
+import Type ( tyVarsOfType, tyVarsOfTypes, splitForAllTys, splitRhoTy )
+import TyCon ( TyCon, tyConKind, tyConArity, isSynTyCon, Arity )
+import Class ( Class )
+
+import TcMonad
+
+import IdInfo ( noIdInfo )
+import Name ( Name, OccName(..),
+ maybeWiredInTyConName, maybeWiredInIdName, isLocallyDefined,
+ NamedThing(..)
)
+import Unique ( pprUnique10{-, pprUnique ToDo:rm-}, Unique, Uniquable(..) )
+import UniqFM
+import Util ( zipEqual, zipWithEqual, zipWith3Equal )
+import Maybes ( maybeToBool )
+import Outputable
+\end{code}
+
+%************************************************************************
+%* *
+\subsection{TcId, TcIdOcc}
+%* *
+%************************************************************************
+
+
+\begin{code}
+type TcIdBndr s = GenId (TcType s) -- Binders are all TcTypes
+data TcIdOcc s = TcId (TcIdBndr s) -- Bindees may be either
+ | RealId Id
+
+instance Eq (TcIdOcc s) where
+ (TcId id1) == (TcId id2) = id1 == id2
+ (RealId id1) == (RealId id2) = id1 == id2
+ _ == _ = False
+
+instance Ord (TcIdOcc s) where
+ (TcId id1) `compare` (TcId id2) = id1 `compare` id2
+ (RealId id1) `compare` (RealId id2) = id1 `compare` id2
+ (TcId _) `compare` (RealId _) = LT
+ (RealId _) `compare` (TcId _) = GT
+
+instance Outputable (TcIdOcc s) where
+ ppr (TcId id) = ppr id
+ ppr (RealId id) = ppr id
+
+instance NamedThing (TcIdOcc s) where
+ getName (TcId id) = getName id
+ getName (RealId id) = getName id
+
+
+tcIdType :: TcIdOcc s -> TcType s
+tcIdType (TcId id) = idType id
+tcIdType (RealId id) = pprPanic "tcIdType:" (ppr id)
+
+tcIdTyVars (TcId id) = tyVarsOfType (idType id)
+tcIdTyVars (RealId _) = emptyTyVarSet -- Top level Ids have no free type variables
+
+
+-- A useful function that takes an occurrence of a global thing
+-- and instantiates its type with fresh type variables
+tcInstId :: Id
+ -> NF_TcM s ([TcTyVar s], -- It's instantiated type
+ TcThetaType s, --
+ TcType s) --
+
+tcInstId id
+ = let
+ (tyvars, rho) = splitForAllTys (idType id)
+ in
+ tcInstTyVars tyvars `thenNF_Tc` \ (tyvars', arg_tys, tenv) ->
+ tcInstType tenv rho `thenNF_Tc` \ rho' ->
+ let
+ (theta', tau') = splitRhoTy rho'
+ in
+ returnNF_Tc (tyvars', theta', tau')
\end{code}
+
+%************************************************************************
+%* *
+\subsection{TcEnv}
+%* *
+%************************************************************************
+
Data type declarations
~~~~~~~~~~~~~~~~~~~~~
(ClassEnv s)
(ValueEnv Id) -- Globals
(ValueEnv (TcIdBndr s)) -- Locals
- (MutableVar s (TcTyVarSet s)) -- Free type variables of locals
+ (TcRef s (TcTyVarSet s)) -- Free type variables of locals
-- ...why mutable? see notes with tcGetGlobalTyVars
type TyVarEnv s = UniqFM (TcKind s, TyVar)
type TyConEnv s = UniqFM (TcKind s, Maybe Arity, TyCon) -- Arity present for Synonyms only
-type ClassEnv s = UniqFM (TcKind s, Class)
+type ClassEnv s = UniqFM ([TcKind s], Class) -- The kinds are the kinds of the args
+ -- to the class
type ValueEnv id = UniqFM id
-initEnv :: MutableVar s (TcTyVarSet s) -> TcEnv s
+initEnv :: TcRef s (TcTyVarSet s) -> TcEnv s
initEnv mut = TcEnv emptyUFM emptyUFM emptyUFM emptyUFM emptyUFM mut
getEnv_LocalIds (TcEnv _ _ _ _ ls _) = eltsUFM ls
getEnv_Classes (TcEnv _ _ cs _ _ _) = [clas | (_, clas) <- eltsUFM cs]
\end{code}
-Making new TcTyVars, with knot tying!
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+Type variable env
+~~~~~~~~~~~~~~~~~
\begin{code}
-tcTyVarScopeGivenKinds
- :: [Name] -- Names of some type variables
- -> [TcKind s]
- -> ([TyVar] -> TcM s a) -- Thing to type check in their scope
- -> TcM s a -- Result
-
-tcTyVarScopeGivenKinds names kinds thing_inside
- = fixTc (\ ~(rec_tyvars, _) ->
- -- Ok to look at names, kinds, but not tyvars!
-
- tcGetEnv `thenNF_Tc` \ (TcEnv tve tce ce gve lve gtvs) ->
- let
- tve' = addListToUFM tve (zipEqual "tcTyVarScopeGivenKinds" names (kinds `zipLazy` rec_tyvars))
- in
- tcSetEnv (TcEnv tve' tce ce gve lve gtvs)
- (thing_inside rec_tyvars) `thenTc` \ result ->
-
- -- Get the tyvar's Kinds from their TcKinds
- mapNF_Tc tcDefaultKind kinds `thenNF_Tc` \ kinds' ->
-
- -- Construct the real TyVars
- let
- tyvars = zipWithEqual "tcTyVarScopeGivenKinds" mk_tyvar names kinds'
- mk_tyvar name kind = mkTyVar name (uniqueOf name) kind
- in
- returnTc (tyvars, result)
- ) `thenTc` \ (_,result) ->
- returnTc result
-
-tcTyVarScope names thing_inside
- = newKindVars (length names) `thenNF_Tc` \ kinds ->
- tcTyVarScopeGivenKinds names kinds thing_inside
+tcExtendTyVarEnv :: [Name] -> [(TcKind s, TyVar)] -> TcM s r -> TcM s r
+tcExtendTyVarEnv names kinds_w_types scope
+ = tcGetEnv `thenNF_Tc` \ (TcEnv tve tce ce gve lve gtvs) ->
+ let
+ tve' = addListToUFM tve (zipEqual "tcTyVarScope" names kinds_w_types)
+ in
+ tcSetEnv (TcEnv tve' tce ce gve lve gtvs) scope
\end{code}
-
The Kind, TyVar, Class and TyCon envs
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-Extending the environments. Notice the uses of @zipLazy@, which makes sure
-that the knot-tied TyVars, TyCons and Classes aren't looked at too early.
+Extending the environments.
\begin{code}
-tcExtendTyConEnv :: [(RnName,Maybe Arity)] -> [TyCon] -> TcM s r -> TcM s r
+tcExtendTyConEnv :: [(Name, (TcKind s, Maybe Arity, TyCon))] -> TcM s r -> TcM s r
-tcExtendTyConEnv names_w_arities tycons scope
- = newKindVars (length names_w_arities) `thenNF_Tc` \ kinds ->
- tcGetEnv `thenNF_Tc` \ (TcEnv tve tce ce gve lve gtvs) ->
+tcExtendTyConEnv bindings scope
+ = tcGetEnv `thenNF_Tc` \ (TcEnv tve tce ce gve lve gtvs) ->
let
- tce' = addListToUFM tce [ (name, (kind, arity, tycon))
- | ((name,arity), (kind,tycon))
- <- zipEqual "tcExtendTyConEnv" names_w_arities (kinds `zipLazy` tycons)
- ]
+ tce' = addListToUFM tce bindings
in
- tcSetEnv (TcEnv tve tce' ce gve lve gtvs) scope `thenTc` \ result ->
- mapNF_Tc tcDefaultKind kinds `thenNF_Tc_`
- returnTc result
+ tcSetEnv (TcEnv tve tce' ce gve lve gtvs) scope
-tcExtendClassEnv :: [RnName] -> [Class] -> TcM s r -> TcM s r
-tcExtendClassEnv names classes scope
- = newKindVars (length names) `thenNF_Tc` \ kinds ->
- tcGetEnv `thenNF_Tc` \ (TcEnv tve tce ce gve lve gtvs) ->
+tcExtendClassEnv :: [(Name, ([TcKind s], Class))] -> TcM s r -> TcM s r
+tcExtendClassEnv bindings scope
+ = tcGetEnv `thenNF_Tc` \ (TcEnv tve tce ce gve lve gtvs) ->
let
- ce' = addListToUFM ce (zipEqual "tcExtendClassEnv" names (kinds `zipLazy` classes))
+ ce' = addListToUFM ce bindings
in
- tcSetEnv (TcEnv tve tce ce' gve lve gtvs) scope `thenTc` \ result ->
- mapNF_Tc tcDefaultKind kinds `thenNF_Tc_`
- returnTc result
+ tcSetEnv (TcEnv tve tce ce' gve lve gtvs) scope
\end{code}
\begin{code}
tcLookupTyVar name
= tcGetEnv `thenNF_Tc` \ (TcEnv tve tce ce gve lve gtvs) ->
- returnNF_Tc (lookupWithDefaultUFM tve (pprPanic "tcLookupTyVar:" (ppr PprShowAll name)) name)
-
+ returnNF_Tc (lookupWithDefaultUFM tve (pprPanic "tcLookupTyVar:" (ppr name)) name)
-tcLookupTyCon (WiredInTyCon tc) -- wired in tycons
- = returnNF_Tc (kindToTcKind (tyConKind tc), synTyConArity tc, tc)
tcLookupTyCon name
- = tcGetEnv `thenNF_Tc` \ (TcEnv tve tce ce gve lve gtvs) ->
- returnNF_Tc (lookupWithDefaultUFM tce (pprPanic "tcLookupTyCon:" (ppr PprShowAll name)) name)
+ = -- Try for a wired-in tycon
+ case maybeWiredInTyConName name of {
+ Just tc | isSynTyCon tc -> returnTc (kind, Just (tyConArity tc), tc)
+ | otherwise -> returnTc (kind, Nothing, tc)
+ where {
+ kind = kindToTcKind (tyConKind tc)
+ };
+
+ Nothing ->
+
+ -- Try in the environment
+ tcGetEnv `thenNF_Tc` \ (TcEnv tve tce ce gve lve gtvs) ->
+ case lookupUFM tce name of {
+ Just stuff -> returnTc stuff;
+
+ Nothing ->
+
+ -- Could be that he's using a class name as a type constructor
+ case lookupUFM ce name of
+ Just _ -> failWithTc (classAsTyConErr name)
+ Nothing -> pprPanic "tcLookupTyCon:" (ppr name)
+ } }
tcLookupTyConByKey uniq
= tcGetEnv `thenNF_Tc` \ (TcEnv tve tce ce gve lve gtvs) ->
let
(kind, arity, tycon) = lookupWithDefaultUFM_Directly tce
- (pprPanic "tcLookupTyCon:" (pprUnique10 uniq))
+ (pprPanic "tcLookupTyConByKey:" (pprUnique10 uniq))
uniq
in
returnNF_Tc tycon
tcLookupClass name
= tcGetEnv `thenNF_Tc` \ (TcEnv tve tce ce gve lve gtvs) ->
--- pprTrace "tcLookupClass:" (ppCat [ppStr "Uniq:", pprUnique10 (uniqueOf name), ppStr "; avail:", ppCat (map (pprUnique10 . fst) (ufmToList ce))]) $
--- pprTrace "tcLookupClass:" (ppCat [ppStr "Uniq:", pprUnique (uniqueOf name), ppStr "; avail:", ppCat (map (pprUnique . fst) (ufmToList ce))]) $
- returnNF_Tc (lookupWithDefaultUFM ce (pprPanic "tcLookupClass:" (ppr PprShowAll name)) name)
+ case lookupUFM ce name of
+ Just stuff -- Common case: it's ok
+ -> returnTc stuff
+
+ Nothing -- Could be that he's using a type constructor as a class
+ | maybeToBool (maybeWiredInTyConName name)
+ || maybeToBool (lookupUFM tce name)
+ -> failWithTc (tyConAsClassErr name)
+
+ | otherwise -- Wierd! Renamer shouldn't let this happen
+ -> pprPanic "tcLookupClass" (ppr name)
tcLookupClassByKey uniq
= tcGetEnv `thenNF_Tc` \ (TcEnv tve tce ce gve lve gtvs) ->
= tcGetEnv `thenNF_Tc` \ (TcEnv tve tce ce gve lve gtvs) ->
tcReadMutVar gtvs `thenNF_Tc` \ global_tvs ->
zonkTcTyVars global_tvs `thenNF_Tc` \ global_tvs' ->
- tcWriteMutVar gtvs global_tvs' `thenNF_Tc_`
+ tcWriteMutVar gtvs global_tvs' `thenNF_Tc_`
returnNF_Tc global_tvs'
+
+tcExtendGlobalTyVars extra_global_tvs scope
+ = tcGetEnv `thenNF_Tc` \ (TcEnv tve tce ce gve lve gtvs) ->
+ tcReadMutVar gtvs `thenNF_Tc` \ global_tvs ->
+ let
+ new_global_tyvars = global_tvs `unionTyVarSets` mkTyVarSet extra_global_tvs
+ in
+ tcNewMutVar new_global_tyvars `thenNF_Tc` \ gtvs' ->
+ tcSetEnv (TcEnv tve tce ce gve lve gtvs') scope
\end{code}
\begin{code}
-tcLookupLocalValue :: RnName -> NF_TcM s (Maybe (TcIdBndr s))
+tcLookupLocalValue :: Name -> NF_TcM s (Maybe (TcIdBndr s))
tcLookupLocalValue name
= tcGetEnv `thenNF_Tc` \ (TcEnv tve tce ce gve lve gtvs) ->
returnNF_Tc (lookupUFM lve name)
= tcGetEnv `thenNF_Tc` \ (TcEnv tve tce ce gve lve gtvs) ->
returnNF_Tc (lookupUFM_Directly lve uniq)
-tcLookupLocalValueOK :: String -> RnName -> NF_TcM s (TcIdBndr s)
+tcLookupLocalValueOK :: String -> Name -> NF_TcM s (TcIdBndr s)
tcLookupLocalValueOK err name
= tcGetEnv `thenNF_Tc` \ (TcEnv tve tce ce gve lve gtvs) ->
returnNF_Tc (lookupWithDefaultUFM lve (panic err) name)
-tcLookupGlobalValue :: RnName -> NF_TcM s Id
-
-tcLookupGlobalValue (WiredInId id) -- wired in ids
- = returnNF_Tc id
-
+tcLookupGlobalValue :: Name -> NF_TcM s Id
tcLookupGlobalValue name
- = tcGetEnv `thenNF_Tc` \ (TcEnv tve tce ce gve lve gtvs) ->
- returnNF_Tc (lookupWithDefaultUFM gve def name)
+ = case maybeWiredInIdName name of
+ Just id -> returnNF_Tc id
+ Nothing -> tcGetEnv `thenNF_Tc` \ (TcEnv tve tce ce gve lve gtvs) ->
+ returnNF_Tc (lookupWithDefaultUFM gve def name)
where
-#ifdef DEBUG
- def = pprPanic "tcLookupGlobalValue:" (ppr PprDebug name)
-#else
- def = panic "tcLookupGlobalValue"
-#endif
+ def = pprPanic "tcLookupGlobalValue:" (ppr name)
+
+tcLookupGlobalValueMaybe :: Name -> NF_TcM s (Maybe Id)
+tcLookupGlobalValueMaybe name
+ = case maybeWiredInIdName name of
+ Just id -> returnNF_Tc (Just id)
+ Nothing -> tcGetEnv `thenNF_Tc` \ (TcEnv tve tce ce gve lve gtvs) ->
+ returnNF_Tc (lookupUFM gve name)
+
tcLookupGlobalValueByKey :: Unique -> NF_TcM s Id
tcLookupGlobalValueByKey uniq
def = panic "tcLookupGlobalValueByKey"
#endif
+tcLookupGlobalValueByKeyMaybe :: Unique -> NF_TcM s (Maybe Id)
+tcLookupGlobalValueByKeyMaybe uniq
+ = tcGetEnv `thenNF_Tc` \ (TcEnv tve tce ce gve lve gtvs) ->
+ returnNF_Tc (lookupUFM_Directly gve uniq)
+
+
+-- Non-monadic version, environment given explicitly
+tcExplicitLookupGlobal :: TcEnv s -> Name -> Maybe Id
+tcExplicitLookupGlobal (TcEnv tve tce ce gve lve gtvs) name
+ = case maybeWiredInIdName name of
+ Just id -> Just id
+ Nothing -> lookupUFM gve name
+
+ -- Extract the IdInfo from an IfaceSig imported from an interface file
+tcAddImportedIdInfo :: TcEnv s -> Id -> Id
+tcAddImportedIdInfo unf_env id
+ | isLocallyDefined id -- Don't look up locally defined Ids, because they
+ -- have explicit local definitions, so we get a black hole!
+ = id
+ | otherwise
+ = id `replaceIdInfo` new_info
+ -- The Id must be returned without a data dependency on maybe_id
+ where
+ new_info = -- pprTrace "tcAdd" (ppr id) $
+ case tcExplicitLookupGlobal unf_env (getName id) of
+ Nothing -> noIdInfo
+ Just imported_id -> idInfo imported_id
+ -- ToDo: could check that types are the same
\end{code}
~~~~~~~~~~~~~~~~~~~~
\begin{code}
-newMonoIds :: [RnName] -> Kind -> ([TcIdBndr s] -> TcM s a) -> TcM s a
+-- Uses the Name as the Name of the Id
+newMonoIds :: [Name] -> Kind -> ([TcIdBndr s] -> TcM s a) -> TcM s a
newMonoIds names kind m
= newTyVarTys no_of_names kind `thenNF_Tc` \ tys ->
- tcGetUniques no_of_names `thenNF_Tc` \ uniqs ->
let
- new_ids = zipWith3Equal "newMonoIds" mk_id names uniqs tys
-
- mk_id name uniq ty
- = let
- name_str = case (getOccName name) of { Unqual n -> n; Qual m n -> n }
- in
- mkUserLocal name_str uniq ty (getSrcLoc name)
+ new_ids = zipWithEqual "newMonoIds" mk_id names tys
+ mk_id name ty = mkUserId name ty
in
tcExtendLocalValEnv names new_ids (m new_ids)
where
no_of_names = length names
-newLocalId :: FAST_STRING -> TcType s -> NF_TcM s (TcIdOcc s)
+newLocalId :: OccName -> TcType s -> NF_TcM s (TcIdBndr s)
newLocalId name ty
= tcGetSrcLoc `thenNF_Tc` \ loc ->
tcGetUnique `thenNF_Tc` \ uniq ->
- returnNF_Tc (TcId (mkUserLocal name uniq ty loc))
+ returnNF_Tc (mkUserLocal name uniq ty loc)
-newLocalIds :: [FAST_STRING] -> [TcType s] -> NF_TcM s [TcIdOcc s]
+newLocalIds :: [OccName] -> [TcType s] -> NF_TcM s [TcIdBndr s]
newLocalIds names tys
= tcGetSrcLoc `thenNF_Tc` \ loc ->
tcGetUniques (length names) `thenNF_Tc` \ uniqs ->
let
new_ids = zipWith3Equal "newLocalIds" mk_id names uniqs tys
- mk_id name uniq ty = TcId (mkUserLocal name uniq ty loc)
+ mk_id name uniq ty = mkUserLocal name uniq ty loc
in
returnNF_Tc new_ids
\end{code}
+\begin{code}
+classAsTyConErr name
+ = ptext SLIT("Class used as a type constructor:") <+> ppr name
+
+tyConAsClassErr name
+ = ptext SLIT("Type constructor used as a class:") <+> ppr name
+\end{code}
projects / ghc-hetmet.git / blobdiff