module TcTyDecls (
tcTyDecl,
tcConDecl,
- tcRecordSelectors
+ mkDataBinds
) where
-import Ubiq{-uitous-}
+IMP_Ubiq(){-uitous-}
-import HsSyn ( TyDecl(..), ConDecl(..), BangType(..), HsExpr(..),
+import HsSyn ( TyDecl(..), ConDecl(..), ConDetails(..), BangType(..), HsExpr(..),
Match(..), GRHSsAndBinds(..), GRHS(..), OutPat(..),
- HsBinds(..), HsLit, Stmt, Qual, ArithSeqInfo, PolyType,
- Bind(..), MonoBinds(..), Sig,
- MonoType )
-import RnHsSyn ( RenamedTyDecl(..), RenamedConDecl(..),
- RnName{-instance Outputable-}
+ HsBinds(..), HsLit, Stmt, DoOrListComp, ArithSeqInfo,
+ SYN_IE(RecFlag), nonRecursive, andMonoBinds,
+ HsType, Fake, InPat, HsTyVar, Fixity,
+ MonoBinds(..), Sig
)
-import TcHsSyn ( TcHsBinds(..), TcIdOcc(..), mkHsTyLam )
-
-import TcMonoType ( tcMonoTypeKind, tcMonoType, tcContext )
-import TcType ( tcInstTyVars, tcInstType )
+import HsTypes ( getTyVarName )
+import RnHsSyn ( RenamedTyDecl(..), RenamedConDecl(..) )
+import TcHsSyn ( mkHsTyLam, mkHsDictLam, tcIdType,
+ SYN_IE(TcHsBinds), SYN_IE(TcMonoBinds)
+ )
+import Inst ( newDicts, InstOrigin(..), Inst )
+import TcMonoType ( tcHsTypeKind, tcHsType, tcContext )
+import TcSimplify ( tcSimplifyThetas )
+import TcType ( TcIdOcc(..), tcInstTyVars, tcInstType, tcInstId )
import TcEnv ( tcLookupTyCon, tcLookupTyVar, tcLookupClass,
- newLocalId
+ newLocalId, newLocalIds, tcLookupClassByKey
)
import TcMonad
import TcKind ( TcKind, unifyKind, mkTcArrowKind, mkTcTypeKind )
-import Id ( mkDataCon, dataConSig, mkRecordSelId,
- dataConFieldLabels, StrictnessMark(..)
+import PprType ( GenClass, GenType{-instance Outputable-},
+ GenTyVar{-instance Outputable-}{-ToDo:possibly rm-}
+ )
+import CoreUnfold ( getUnfoldingTemplate )
+import Class ( GenClass{-instance Eq-}, classInstEnv, SYN_IE(Class) )
+import Id ( mkDataCon, dataConSig, mkRecordSelId, idType,
+ dataConFieldLabels, dataConStrictMarks,
+ StrictnessMark(..), getIdUnfolding,
+ GenId{-instance NamedThing-},
+ SYN_IE(Id)
)
import FieldLabel
import Kind ( Kind, mkArrowKind, mkBoxedTypeKind )
-import SpecEnv ( SpecEnv(..), nullSpecEnv )
-import Name ( Name{-instance Ord3-} )
+import SpecEnv ( SpecEnv, nullSpecEnv )
+import Name ( nameSrcLoc, isLocallyDefined, getSrcLoc,
+ OccName(..), Name{-instance Ord3-},
+ NamedThing(..)
+ )
+import Outputable ( Outputable(..), interpp'SP )
import Pretty
-import TyCon ( TyCon, NewOrData(..), mkSynTyCon, mkDataTyCon, tyConDataCons )
-import Type ( getTypeKind, getTyVar, tyVarsOfTypes, eqTy, applyTyCon,
- mkForAllTys, mkFunTy )
-import TyVar ( getTyVarKind, elementOfTyVarSet )
-import UniqSet ( emptyUniqSet, mkUniqSet, uniqSetToList, unionManyUniqSets, UniqSet(..) )
-import Util ( panic, equivClasses )
+import TyCon ( TyCon, NewOrData, mkSynTyCon, mkDataTyCon, isAlgTyCon,
+ isSynTyCon, tyConDataCons
+ )
+import Type ( GenType, -- instances
+ typeKind, getTyVar, tyVarsOfTypes, eqTy, splitSigmaTy,
+ applyTyCon, mkTyVarTys, mkForAllTys, mkFunTy,
+ splitFunTy, mkTyVarTy, getTyVar_maybe,
+ SYN_IE(Type)
+ )
+import TyVar ( tyVarKind, elementOfTyVarSet,
+ GenTyVar{-instance Eq-}, SYN_IE(TyVar) )
+import Unique ( Unique {- instance Eq -}, evalClassKey )
+import UniqSet ( emptyUniqSet, mkUniqSet, uniqSetToList, unionManyUniqSets, SYN_IE(UniqSet) )
+import Util ( equivClasses, zipEqual, nOfThem, panic, assertPanic, Ord3(..) )
\end{code}
\begin{code}
tcAddErrCtxt (tySynCtxt tycon_name) $
-- Look up the pieces
- tcLookupTyCon tycon_name `thenNF_Tc` \ (tycon_kind, _, rec_tycon) ->
- mapAndUnzipNF_Tc tcLookupTyVar tyvar_names `thenNF_Tc` \ (tyvar_kinds, rec_tyvars) ->
+ tcLookupTyCon tycon_name `thenTc` \ (tycon_kind, _, rec_tycon) ->
+ mapAndUnzipNF_Tc (tcLookupTyVar.getTyVarName) tyvar_names
+ `thenNF_Tc` \ (tyvar_kinds, rec_tyvars) ->
-- Look at the rhs
- tcMonoTypeKind rhs `thenTc` \ (rhs_kind, rhs_ty) ->
+ tcHsTypeKind rhs `thenTc` \ (rhs_kind, rhs_ty) ->
-- Unify tycon kind with (k1->...->kn->rhs)
unifyKind tycon_kind
-- but the simplest thing to do seems to be to get the Kind by (lazily)
-- looking at the tyvars and rhs_ty.
result_kind, final_tycon_kind :: Kind -- NB not TcKind!
- result_kind = getTypeKind rhs_ty
- final_tycon_kind = foldr (mkArrowKind . getTyVarKind) result_kind rec_tyvars
+ result_kind = typeKind rhs_ty
+ final_tycon_kind = foldr (mkArrowKind . tyVarKind) result_kind rec_tyvars
-- Construct the tycon
tycon = mkSynTyCon (getName tycon_name)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
\begin{code}
-tcTyDecl (TyData context tycon_name tyvar_names con_decls derivings pragmas src_loc)
- = tcTyDataOrNew DataType context tycon_name tyvar_names con_decls derivings pragmas src_loc
-
-tcTyDecl (TyNew context tycon_name tyvar_names con_decl derivings pragmas src_loc)
- = tcTyDataOrNew NewType context tycon_name tyvar_names con_decl derivings pragmas src_loc
-
-
-tcTyDataOrNew data_or_new context tycon_name tyvar_names con_decls derivings pragmas src_loc
+tcTyDecl (TyData data_or_new context tycon_name tyvar_names con_decls derivings pragmas src_loc)
= tcAddSrcLoc src_loc $
tcAddErrCtxt (tyDataCtxt tycon_name) $
-- Lookup the pieces
- tcLookupTyCon tycon_name `thenNF_Tc` \ (tycon_kind, _, rec_tycon) ->
- mapAndUnzipNF_Tc tcLookupTyVar tyvar_names `thenNF_Tc` \ (tyvar_kinds, rec_tyvars) ->
- tc_derivs derivings `thenNF_Tc` \ derived_classes ->
+ tcLookupTyCon tycon_name `thenTc` \ (tycon_kind, _, rec_tycon) ->
+ mapAndUnzipNF_Tc (tcLookupTyVar.getTyVarName)
+ tyvar_names `thenNF_Tc` \ (tyvar_kinds, rec_tyvars) ->
+ tc_derivs derivings `thenTc` \ derived_classes ->
-- Typecheck the context
tcContext context `thenTc` \ ctxt ->
let
-- Construct the tycon
final_tycon_kind :: Kind -- NB not TcKind!
- final_tycon_kind = foldr (mkArrowKind . getTyVarKind) mkBoxedTypeKind rec_tyvars
+ final_tycon_kind = foldr (mkArrowKind . tyVarKind) mkBoxedTypeKind rec_tyvars
tycon = mkDataTyCon (getName tycon_name)
final_tycon_kind
in
returnTc tycon
-tc_derivs Nothing = returnNF_Tc []
-tc_derivs (Just ds) = mapNF_Tc tc_deriv ds
+tc_derivs Nothing = returnTc []
+tc_derivs (Just ds) = mapTc tc_deriv ds
tc_deriv name
- = tcLookupClass name `thenNF_Tc` \ (_, clas) ->
- returnNF_Tc clas
+ = tcLookupClass name `thenTc` \ (_, clas) ->
+ returnTc clas
\end{code}
-Generating selector bindings for record delarations
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+Generating constructor/selector bindings for data declarations
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
\begin{code}
-tcRecordSelectors :: TyCon -> TcM s ([Id], TcHsBinds s)
-tcRecordSelectors tycon
- = mapAndUnzipTc (tcRecordSelector tycon) groups `thenTc` \ (ids, binds) ->
- returnTc (ids, SingleBind (NonRecBind (foldr AndMonoBinds EmptyMonoBinds binds)))
+mkDataBinds :: [TyCon] -> TcM s ([Id], TcMonoBinds s)
+mkDataBinds [] = returnTc ([], EmptyMonoBinds)
+mkDataBinds (tycon : tycons)
+ | isSynTyCon tycon = mkDataBinds tycons
+ | otherwise = mkDataBinds_one tycon `thenTc` \ (ids1, b1) ->
+ mkDataBinds tycons `thenTc` \ (ids2, b2) ->
+ returnTc (ids1++ids2, b1 `AndMonoBinds` b2)
+
+mkDataBinds_one tycon
+ = ASSERT( isAlgTyCon tycon )
+ mapTc checkConstructorContext data_cons `thenTc_`
+ mapTc (mkRecordSelector tycon) groups `thenTc` \ sel_ids ->
+ let
+ data_ids = data_cons ++ sel_ids
+
+ -- For the locally-defined things
+ -- we need to turn the unfoldings inside the Ids into bindings,
+ binds = [ CoreMonoBind (RealId data_id) (getUnfoldingTemplate (getIdUnfolding data_id))
+ | data_id <- data_ids, isLocallyDefined data_id
+ ]
+ in
+ returnTc (data_ids, andMonoBinds binds)
where
data_cons = tyConDataCons tycon
fields = [ (con, field) | con <- data_cons,
= fieldLabelName field1 `cmp` fieldLabelName field2
\end{code}
-We're going to build a record selector that looks like this:
-
- data T a b c = T1 { op :: a, ...}
- | T2 { op :: a, ...}
- | T3
+-- Check that all the types of all the strict arguments are in Eval
- sel :: forall a b c. T a b c -> a
- sel = /\ a b c -> \ T1 { sel = x } -> x
- T2 { sel = 2 } -> x
+\begin{code}
+checkConstructorContext con_id
+ | not (isLocallyDefined con_id)
+ = returnTc ()
-Note that the selector Id itself is used as the field
-label; it has to be an Id, you see!
+ | otherwise -- It is locally defined
+ = tcLookupClassByKey evalClassKey `thenNF_Tc` \ eval_clas ->
+ let
+ strict_marks = dataConStrictMarks con_id
+ (tyvars,theta,tau) = splitSigmaTy (idType con_id)
+ (arg_tys, result_ty) = splitFunTy tau
+
+ eval_theta = [ (eval_clas,arg_ty)
+ | (arg_ty, MarkedStrict) <- zipEqual "strict_args"
+ arg_tys strict_marks
+ ]
+ in
+ tcSimplifyThetas classInstEnv theta eval_theta `thenTc` \ eval_theta' ->
+ checkTc (null eval_theta')
+ (missingEvalErr con_id eval_theta')
+\end{code}
\begin{code}
-tcRecordSelector tycon fields@((first_con, first_field_label) : other_fields)
- = panic "tcRecordSelector: don't typecheck"
-{-
- = let
- field_ty = fieldLabelType first_field_label
- field_name = fieldLabelName first_field_label
- other_tys = [fieldLabelType fl | (_, fl) <- fields]
- (tyvars, _, _, _) = dataConSig first_con
- -- tyvars of first_con may be free in first_ty
- in
-
+mkRecordSelector tycon fields@((first_con, first_field_label) : other_fields)
+ -- These fields all have the same name, but are from
+ -- different constructors in the data type
-- Check that all the fields in the group have the same type
-- This check assumes that all the constructors of a given
-- data type use the same type variables
- checkTc (all (eqTy field_ty) other_tys)
+ = checkTc (all (eqTy field_ty) other_tys)
(fieldTypeMisMatch field_name) `thenTc_`
-
- -- Create an Id for the field itself
- tcInstTyVars tyvars `thenNF_Tc` \ (tyvars', tyvar_tys, tenv) ->
- tcInstType tenv field_ty `thenNF_Tc` \ field_ty' ->
- let
- data_ty' = applyTyCon tycon tyvar_tys
- in
- newLocalId SLIT("x") field_ty' `thenNF_Tc` \ field_id ->
- newLocalId SLIT("r") data_ty' `thenNF_Tc` \ record_id ->
-
- -- Now build the selector
- let
- tycon_src_loc = getSrcLoc tycon
-
- selector_ty = mkForAllTys tyvars' $
- mkFunTy data_ty' $
- field_ty'
+ returnTc selector_id
+ where
+ field_ty = fieldLabelType first_field_label
+ field_name = fieldLabelName first_field_label
+ other_tys = [fieldLabelType fl | (_, fl) <- other_fields]
+ (tyvars, _, _, _, _, _) = dataConSig first_con
+ data_ty = applyTyCon tycon (mkTyVarTys tyvars)
+ -- tyvars of first_con may be free in field_ty
+ -- Now build the selector
+
+ selector_ty :: Type
+ selector_ty = mkForAllTys tyvars $
+ mkFunTy data_ty $
+ field_ty
- selector_id = mkRecordSelId first_field_label selector_ty
-
- -- HsSyn is dreadfully verbose for defining the selector!
- selector_rhs = mkHsTyLam tyvars' $
- HsLam $
- PatMatch (VarPat record_id) $
- GRHSMatch $
- GRHSsAndBindsOut [OtherwiseGRHS selector_body tycon_src_loc]
- EmptyBinds field_ty'
-
- selector_body = HsCase (HsVar record_id) (map mk_match fields) tycon_src_loc
-
- mk_match (con_id, field_label)
- = PatMatch (RecPat con_id data_ty' [(selector_id, VarPat field_id, False)]) $
- GRHSMatch $
- GRHSsAndBindsOut [OtherwiseGRHS (HsVar field_id)
- (getSrcLoc (fieldLabelName field_label))]
- EmptyBinds
- field_ty'
- in
- returnTc (selector_id, VarMonoBind selector_id selector_rhs)
--}
+ selector_id :: Id
+ selector_id = mkRecordSelId first_field_label selector_ty
\end{code}
Constructors
\begin{code}
tcConDecl :: TyCon -> [TyVar] -> [(Class,Type)] -> RenamedConDecl -> TcM s Id
-tcConDecl tycon tyvars ctxt (ConDecl name btys src_loc)
+tcConDecl tycon tyvars ctxt (ConDecl name ex_ctxt (VanillaCon btys) src_loc)
= tcDataCon tycon tyvars ctxt name btys src_loc
-tcConDecl tycon tyvars ctxt (ConOpDecl bty1 op bty2 src_loc)
+tcConDecl tycon tyvars ctxt (ConDecl op ex_ctxt (InfixCon bty1 bty2) src_loc)
= tcDataCon tycon tyvars ctxt op [bty1,bty2] src_loc
-tcConDecl tycon tyvars ctxt (NewConDecl name ty src_loc)
+tcConDecl tycon tyvars ctxt (ConDecl name ex_ctxt (NewCon ty) src_loc)
= tcAddSrcLoc src_loc $
- tcMonoType ty `thenTc` \ arg_ty ->
+ tcHsType ty `thenTc` \ arg_ty ->
let
data_con = mkDataCon (getName name)
[NotMarkedStrict]
[{- No labelled fields -}]
tyvars
ctxt
+ [] [] -- Temporary
[arg_ty]
tycon
- -- nullSpecEnv
in
returnTc data_con
-tcConDecl tycon tyvars ctxt (RecConDecl name fields src_loc)
+tcConDecl tycon tyvars ctxt (ConDecl name ex_ctxt (RecCon fields) src_loc)
= tcAddSrcLoc src_loc $
mapTc tcField fields `thenTc` \ field_label_infos_s ->
let
arg_tys = [ty | (_, ty, _) <- field_label_infos]
field_labels = [ mkFieldLabel (getName name) ty tag
- | ((name, ty, _), tag) <- field_label_infos `zip` allFieldLabelTags
- ]
+ | ((name, ty, _), tag) <- field_label_infos `zip` allFieldLabelTags ]
data_con = mkDataCon (getName name)
stricts
field_labels
tyvars
(thinContext arg_tys ctxt)
+ [] [] -- Temporary
arg_tys
tycon
- -- nullSpecEnv
in
returnTc data_con
tcField (field_label_names, bty)
- = tcMonoType (get_ty bty) `thenTc` \ field_ty ->
+ = tcHsType (get_pty bty) `thenTc` \ field_ty ->
returnTc [(name, field_ty, get_strictness bty) | name <- field_label_names]
tcDataCon tycon tyvars ctxt name btys src_loc
= tcAddSrcLoc src_loc $
let
stricts = map get_strictness btys
- tys = map get_ty btys
+ tys = map get_pty btys
in
- mapTc tcMonoType tys `thenTc` \ arg_tys ->
+ mapTc tcHsType tys `thenTc` \ arg_tys ->
let
data_con = mkDataCon (getName name)
stricts
[{- No field labels -}]
tyvars
(thinContext arg_tys ctxt)
+ [] [] -- Temporary
arg_tys
tycon
- -- nullSpecEnv
in
returnTc data_con
arg_tyvars = tyVarsOfTypes arg_tys
in_arg_tys (clas,ty) = getTyVar "tcDataCon" ty `elementOfTyVarSet` arg_tyvars
-get_strictness (Banged ty) = MarkedStrict
-get_strictness (Unbanged ty) = NotMarkedStrict
+get_strictness (Banged _) = MarkedStrict
+get_strictness (Unbanged _) = NotMarkedStrict
-get_ty (Banged ty) = ty
-get_ty (Unbanged ty) = ty
+get_pty (Banged ty) = ty
+get_pty (Unbanged ty) = ty
\end{code}
~~~~~~~~~~~~~~~~~~~
\begin{code}
tySynCtxt tycon_name sty
- = ppCat [ppStr "In the type declaration for", ppr sty tycon_name]
+ = hsep [ptext SLIT("In the type declaration for"), ppr sty tycon_name]
tyDataCtxt tycon_name sty
- = ppCat [ppStr "In the data declaration for", ppr sty tycon_name]
+ = hsep [ptext SLIT("In the data declaration for"), ppr sty tycon_name]
tyNewCtxt tycon_name sty
- = ppCat [ppStr "In the newtype declaration for", ppr sty tycon_name]
+ = hsep [ptext SLIT("In the newtype declaration for"), ppr sty tycon_name]
fieldTypeMisMatch field_name sty
- = ppSep [ppStr "Declared types differ for field", ppr sty field_name]
+ = sep [ptext SLIT("Declared types differ for field"), ppr sty field_name]
+
+missingEvalErr con eval_theta sty
+ = hsep [ptext SLIT("Missing Eval context for constructor"),
+ ppr sty con,
+ char ':', ppr sty eval_theta]
\end{code}
projects / ghc-hetmet.git / blobdiff