#include "HsVersions.h"
import HsSyn ( HsDecl(..), TyClDecl(..),
- HsType(..), HsTyVar,
+ HsType(..), HsTyVarBndr,
ConDecl(..), ConDetails(..), BangType(..),
- Sig(..),
+ Sig(..), HsPred(..), HsTupCon(..),
tyClDeclName, isClassDecl, isSynDecl
)
-import RnHsSyn ( RenamedHsDecl, RenamedTyClDecl, listTyCon_name, tupleTyCon_name )
+import RnHsSyn ( RenamedHsDecl, RenamedTyClDecl, listTyCon_name )
import BasicTypes ( RecFlag(..), NewOrData(..), Arity )
import TcMonad
import Inst ( InstanceMapper )
import TcClassDcl ( kcClassDecl, tcClassDecl1 )
import TcEnv ( ValueEnv, TcTyThing(..),
- tcExtendTypeEnv
+ tcExtendTypeEnv, getEnvAllTyCons
)
import TcTyDecls ( tcTyDecl, kcTyDecl )
import TcMonoType ( kcHsTyVar )
import TcType ( TcKind, newKindVar, newKindVars, kindToTcKind, zonkTcKindToKind )
import Type ( mkArrowKind, boxedTypeKind )
-import Class ( Class, classBigSig )
-import Var ( tyVarKind )
+
+import Class ( Class )
+import Var ( TyVar, tyVarKind )
+import FiniteMap
import Bag
+import VarSet
import Digraph ( stronglyConnComp, SCC(..) )
import Name ( Name, NamedThing(..), getSrcLoc, isTvOcc, nameOccName )
import Outputable
-import Maybes ( mapMaybe )
+import Maybes ( mapMaybe, catMaybes, expectJust )
import UniqSet ( UniqSet, emptyUniqSet,
unitUniqSet, unionUniqSets,
unionManyUniqSets, uniqSetToList )
import ErrUtils ( Message )
import SrcLoc ( SrcLoc )
-import TyCon ( TyCon )
+import TyCon ( TyCon, ArgVrcs )
+import Variance ( calcTyConArgVrcs )
import Unique ( Unique, Uniquable(..) )
import UniqFM ( listToUFM, lookupUFM )
\end{code}
Dealing with a group
~~~~~~~~~~~~~~~~~~~~
+The knot-tying parameters: @rec_tyclss@ is an alist mapping @Name@s to
+@TcTyThing@s. @rec_vrcs@ is a finite map from @Name@s to @ArgVrcs@s.
+
\begin{code}
tcGroup :: ValueEnv -> InstanceMapper -> SCC RenamedTyClDecl -> TcM s TcEnv
tcGroup unf_env inst_mapper scc
-- Tie the knot
-- traceTc (ppr (map fst ty_env_stuff1)) `thenTc_`
- fixTc ( \ ~(rec_tyclss, _) ->
+ fixTc ( \ ~(rec_tyclss, _) ->
let
- rec_env = listToUFM rec_tyclss
+ rec_env = listToUFM rec_tyclss
+ rec_tycons = getEnvAllTyCons rec_tyclss
+ rec_vrcs = calcTyConArgVrcs rec_tycons
in
-- Do type checking
mapNF_Tc (getTyBinding2 rec_env) ty_env_stuff1 `thenNF_Tc` \ ty_env_stuff2 ->
tcExtendTypeEnv ty_env_stuff2 $
- mapTc (tcDecl is_rec_group unf_env inst_mapper) decls `thenTc` \ tyclss ->
+ mapTc (tcDecl is_rec_group unf_env inst_mapper rec_vrcs) decls
+ `thenTc` \ tyclss ->
tcGetEnv `thenTc` \ env ->
returnTc (tyclss, env)
kcTyDecl decl
tcDecl :: RecFlag -- True => recursive group
- -> ValueEnv -> InstanceMapper
+ -> ValueEnv -> InstanceMapper -> FiniteMap Name ArgVrcs
-> RenamedTyClDecl -> TcM s (Name, TcTyThing)
-tcDecl is_rec_group unf_env inst_mapper decl
+tcDecl is_rec_group unf_env inst_mapper vrcs_env decl
= tcAddDeclCtxt decl $
--- traceTc (text "Starting" <+> ppr name) `thenTc_`
if isClassDecl decl then
- tcClassDecl1 unf_env inst_mapper decl `thenTc` \ clas ->
--- traceTc (text "Finished" <+> ppr name) `thenTc_`
- returnTc (getName clas, AClass clas)
+ tcClassDecl1 unf_env inst_mapper vrcs_env decl
else
- tcTyDecl is_rec_group decl `thenTc` \ tycon ->
--- traceTc (text "Finished" <+> ppr name) `thenTc_`
- returnTc (getName tycon, ATyCon tycon)
-
- where
- name = tyClDeclName decl
+ tcTyDecl is_rec_group vrcs_env decl
tcAddDeclCtxt decl thing_inside
where
(name, loc, thing)
= case decl of
- (ClassDecl _ name _ _ _ _ _ _ loc) -> (name, loc, "class")
- (TySynonym name _ _ loc) -> (name, loc, "type synonym")
- (TyData NewType _ name _ _ _ _ loc) -> (name, loc, "data type")
- (TyData DataType _ name _ _ _ _ loc) -> (name, loc, "newtype")
+ (ClassDecl _ name _ _ _ _ _ _ _ _ _ loc) -> (name, loc, "class")
+ (TySynonym name _ _ loc) -> (name, loc, "type synonym")
+ (TyData NewType _ name _ _ _ _ _ loc) -> (name, loc, "data type")
+ (TyData DataType _ name _ _ _ _ _ loc) -> (name, loc, "newtype")
ctxt = hsep [ptext SLIT("In the"), text thing,
ptext SLIT("declaration for"), quotes (ppr name)]
Why do we need to grab all these type variables at once, including
those locally-quantified type variables in class op signatures?
- [Incidentally, this only works because the names are all unique by now.]
+ [Incidentally, this only works because the names are all unique by now.]
Because we can only commit to the final kind of a type variable when
we've completed the mutually recursive group. For example:
depends on *all the uses of class D*. For example, the use of
Monad c in bop's type signature means that D must have kind Type->Type.
+ [April 00: looks as if we've dropped this subtlety; I'm not sure when]
\begin{code}
-getTyBinding1 :: RenamedTyClDecl -> NF_TcM s (Name, (TcKind, Maybe Arity, TcTyThing))
+getTyBinding1 :: RenamedTyClDecl -> NF_TcM s (Name, (TcKind, TcTyThing))
getTyBinding1 (TySynonym name tyvars _ _)
= mapNF_Tc kcHsTyVar tyvars `thenNF_Tc` \ arg_kinds ->
newKindVar `thenNF_Tc` \ result_kind ->
returnNF_Tc (name, (foldr mkArrowKind result_kind arg_kinds,
- Just (length tyvars),
- ATyCon (pprPanic "ATyCon: syn" (ppr name))))
+ ASynTyCon (pprPanic "ATyCon: syn" (ppr name)) (length tyvars)))
-getTyBinding1 (TyData _ _ name tyvars _ _ _ _)
+getTyBinding1 (TyData _ _ name tyvars _ _ _ _ _)
= mapNF_Tc kcHsTyVar tyvars `thenNF_Tc` \ arg_kinds ->
returnNF_Tc (name, (foldr mkArrowKind boxedTypeKind arg_kinds,
- Nothing,
- ATyCon (error "ATyCon: data")))
+ ADataTyCon (error "ATyCon: data")))
-getTyBinding1 (ClassDecl _ name tyvars _ _ _ _ _ _)
+getTyBinding1 (ClassDecl _ name tyvars _ _ _ _ _ _ _ _ _)
= mapNF_Tc kcHsTyVar tyvars `thenNF_Tc` \ arg_kinds ->
returnNF_Tc (name, (foldr mkArrowKind boxedTypeKind arg_kinds,
- Just (length tyvars),
- AClass (error "AClass")))
+ AClass (pprPanic "AClass" (ppr name)) (length tyvars)))
-- Zonk the kind to its final form, and lookup the
-- recursive tycon/class
-getTyBinding2 rec_env (name, (tc_kind, maybe_arity, thing))
+getTyBinding2 rec_env (name, (tc_kind, thing))
= zonkTcKindToKind tc_kind `thenNF_Tc` \ kind ->
- returnNF_Tc (name, (kind, maybe_arity, mk_thing thing (lookupUFM rec_env name)))
+ returnNF_Tc (name, (kind, mk_thing thing (lookupUFM rec_env name)))
where
- mk_thing (ATyCon _) ~(Just (ATyCon tc)) = ATyCon tc
- mk_thing (AClass _) ~(Just (AClass cls)) = AClass cls
+ mk_thing (ADataTyCon _) ~(Just (ADataTyCon tc)) = ADataTyCon tc
+ mk_thing (ASynTyCon _ arity) ~(Just (ASynTyCon tc _)) = ASynTyCon tc arity
+ mk_thing (AClass _ arity) ~(Just (AClass cls _)) = AClass cls arity
\end{code}
edges = map mk_edges tycl_decls
is_syn_decl (d, _, _) = isSynDecl d
- is_cls_decl (d, _, _) = isClassDecl d
\end{code}
Edges in Type/Class decls
mk_cls_edges :: RenamedTyClDecl -> Maybe (RenamedTyClDecl, Unique, [Unique])
-mk_cls_edges decl@(ClassDecl ctxt name _ _ _ _ _ _ _)
- = Just (decl, getUnique name, map (getUnique . fst) ctxt)
+mk_cls_edges decl@(ClassDecl ctxt name _ _ _ _ _ _ _ _ _ _)
+ = Just (decl, getUnique name, map getUnique (catMaybes (map get_clas ctxt)))
mk_cls_edges other_decl
= Nothing
----------------------------------------------------
mk_edges :: RenamedTyClDecl -> (RenamedTyClDecl, Unique, [Unique])
-mk_edges decl@(TyData _ ctxt name _ condecls derivs _ _)
- = (decl, getUnique name, uniqSetToList (get_ctxt ctxt `unionUniqSets`
- get_cons condecls `unionUniqSets`
+mk_edges decl@(TyData _ ctxt name _ condecls _ derivs _ _)
+ = (decl, getUnique name, uniqSetToList (get_ctxt ctxt `unionUniqSets`
+ get_cons condecls `unionUniqSets`
get_deriv derivs))
mk_edges decl@(TySynonym name _ rhs _)
= (decl, getUnique name, uniqSetToList (get_ty rhs))
-mk_edges decl@(ClassDecl ctxt name _ sigs _ _ _ _ _)
+mk_edges decl@(ClassDecl ctxt name _ _ sigs _ _ _ _ _ _ _)
= (decl, getUnique name, uniqSetToList (get_ctxt ctxt `unionUniqSets`
get_sigs sigs))
----------------------------------------------------
-get_ctxt ctxt = unionManyUniqSets (map (set_name.fst) ctxt)
+get_ctxt ctxt = unionManyUniqSets (map set_name (catMaybes (map get_clas ctxt)))
+get_clas (HsPClass clas _) = Just clas
+get_clas _ = Nothing
----------------------------------------------------
get_deriv Nothing = emptyUniqSet
get_cons cons = unionManyUniqSets (map get_con cons)
----------------------------------------------------
-get_con (ConDecl _ _ ctxt details _)
+get_con (ConDecl _ _ _ ctxt details _)
= get_ctxt ctxt `unionUniqSets` get_con_details details
----------------------------------------------------
get_bty (Unpacked ty) = get_ty ty
----------------------------------------------------
-get_ty (MonoTyVar name)
- = if isTvOcc (nameOccName name) then emptyUniqSet else set_name name
-get_ty (MonoTyApp ty1 ty2)
- = unionUniqSets (get_ty ty1) (get_ty ty2)
-get_ty (MonoFunTy ty1 ty2)
- = unionUniqSets (get_ty ty1) (get_ty ty2)
-get_ty (MonoListTy ty)
- = set_name listTyCon_name `unionUniqSets` get_ty ty
-get_ty (MonoTupleTy tys boxed)
- = set_name (tupleTyCon_name boxed (length tys)) `unionUniqSets` get_tys tys
-get_ty (HsForAllTy _ ctxt mty)
- = get_ctxt ctxt `unionUniqSets` get_ty mty
-get_ty other = panic "TcTyClsDecls:get_ty"
+get_ty (HsTyVar name) | isTvOcc (nameOccName name) = emptyUniqSet
+ | otherwise = set_name name
+get_ty (HsAppTy ty1 ty2) = unionUniqSets (get_ty ty1) (get_ty ty2)
+get_ty (HsFunTy ty1 ty2) = unionUniqSets (get_ty ty1) (get_ty ty2)
+get_ty (HsListTy ty) = set_name listTyCon_name `unionUniqSets` get_ty ty
+get_ty (HsTupleTy (HsTupCon n _) tys) = set_name n `unionUniqSets` get_tys tys
+get_ty (HsUsgTy _ ty) = get_ty ty
+get_ty (HsUsgForAllTy _ ty) = get_ty ty
+get_ty (HsForAllTy _ ctxt mty) = get_ctxt ctxt `unionUniqSets` get_ty mty
+get_ty (HsPredTy (HsPClass name _)) = set_name name
+get_ty (HsPredTy (HsPIParam _ _)) = emptyUniqSet -- I think
----------------------------------------------------
-get_tys tys
- = unionManyUniqSets (map get_ty tys)
+get_tys tys = unionManyUniqSets (map get_ty tys)
----------------------------------------------------
get_sigs sigs
= unionManyUniqSets (map get_sig sigs)
where
- get_sig (ClassOpSig _ _ ty _) = get_ty ty
+ get_sig (ClassOpSig _ _ _ ty _) = get_ty ty
+ get_sig (FixSig _) = emptyUniqSet
get_sig other = panic "TcTyClsDecls:get_sig"
----------------------------------------------------
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