\section[TcTyDecls]{Typecheck type declarations}
\begin{code}
-module TcTyDecls ( tcTyDecl, checkValidTyCon, kcConDetails ) where
+module TcTyDecls ( tcTyDecl, kcConDetails, tcMkDataCon ) where
#include "HsVersions.h"
-import HsSyn ( TyClDecl(..), ConDecl(..), ConDetails(..),
+import HsSyn ( TyClDecl(..), ConDecl(..), HsConDetails(..), BangType,
getBangType, getBangStrictness, conDetailsTys
)
import RnHsSyn ( RenamedTyClDecl, RenamedConDecl, RenamedContext )
-import BasicTypes ( NewOrData(..) )
+import BasicTypes ( NewOrData(..), StrictnessMark )
import TcMonoType ( tcHsTyVars, tcHsTheta, tcHsType,
kcHsContext, kcHsSigType, kcHsLiftedSigType
)
-import TcEnv ( tcExtendTyVarEnv,
- tcLookupTyCon, tcLookupRecId,
- TyThingDetails(..), RecTcEnv
- )
-import TcType ( tcEqType, tyVarsOfTypes, tyVarsOfPred, ThetaType )
-import TcMType ( checkValidType, UserTypeCtxt(..), checkValidTheta, SourceTyCtxt(..) )
-import TcMonad
-
-import DataCon ( DataCon, mkDataCon, dataConFieldLabels, dataConWrapId, dataConName )
-import MkId ( mkDataConId, mkDataConWrapId, mkRecordSelId )
-import FieldLabel
-import Var ( TyVar, idType )
-import Name ( Name, NamedThing(..) )
+import TcEnv ( tcExtendTyVarEnv, tcLookupTyCon, TyThingDetails(..) )
+import TcType ( Type, tyVarsOfTypes, tyVarsOfPred, ThetaType )
+import RnEnv ( lookupSysName )
+import TcRnMonad
+
+import DataCon ( DataCon, mkDataCon, dataConFieldLabels )
+import FieldLabel ( FieldLabel, fieldLabelName, fieldLabelType, allFieldLabelTags, mkFieldLabel )
+import MkId ( mkDataConWorkId, mkDataConWrapId, mkRecordSelId )
+import Var ( TyVar )
+import Name ( Name )
+import OccName ( mkDataConWrapperOcc, mkDataConWorkerOcc, mkGenOcc1, mkGenOcc2 )
import Outputable
-import TyCon ( TyCon, tyConName, tyConTheta, getSynTyConDefn, tyConTyVars, tyConDataCons, isSynTyCon )
+import TyCon ( TyCon, DataConDetails(..), visibleDataCons,
+ tyConTyVars, tyConName )
import VarSet ( intersectVarSet, isEmptyVarSet )
-import PrelNames ( unpackCStringName, unpackCStringUtf8Name )
-import ListSetOps ( equivClasses )
+import Generics ( mkTyConGenInfo )
+import CmdLineOpts ( DynFlag(..) )
import List ( nubBy )
\end{code}
%************************************************************************
\begin{code}
-tcTyDecl :: RecTcEnv -> RenamedTyClDecl -> TcM (Name, TyThingDetails)
-tcTyDecl unf_env (TySynonym {tcdName = tycon_name, tcdSynRhs = rhs})
- = tcLookupTyCon tycon_name `thenNF_Tc` \ tycon ->
+tcTyDecl :: RenamedTyClDecl -> TcM (Name, TyThingDetails)
+tcTyDecl (TySynonym {tcdName = tycon_name, tcdSynRhs = rhs})
+ = tcLookupTyCon tycon_name `thenM` \ tycon ->
tcExtendTyVarEnv (tyConTyVars tycon) $
- tcHsType rhs `thenTc` \ rhs_ty ->
- returnTc (tycon_name, SynTyDetails rhs_ty)
+ tcHsType rhs `thenM` \ rhs_ty ->
+ returnM (tycon_name, SynTyDetails rhs_ty)
-tcTyDecl unf_env (TyData {tcdND = new_or_data, tcdCtxt = context,
- tcdName = tycon_name, tcdCons = con_decls})
- = tcLookupTyCon tycon_name `thenNF_Tc` \ tycon ->
+tcTyDecl (TyData {tcdND = new_or_data, tcdCtxt = context,
+ tcdName = tycon_name, tcdCons = con_decls,
+ tcdGeneric = generic})
+ = tcLookupTyCon tycon_name `thenM` \ tycon ->
let
tyvars = tyConTyVars tycon
in
tcExtendTyVarEnv tyvars $
- tcHsTheta context `thenTc` \ ctxt ->
- mapTc (tcConDecl new_or_data tycon tyvars ctxt) con_decls `thenTc` \ data_cons ->
+ tcHsTheta context `thenM` \ ctxt ->
+ tcConDecls new_or_data tycon tyvars ctxt con_decls `thenM` \ data_cons ->
let
- sel_ids = mkRecordSelectors unf_env tycon data_cons
+ sel_ids = mkRecordSelectors tycon data_cons
in
- returnTc (tycon_name, DataTyDetails ctxt data_cons sel_ids)
+ tcGenericInfo tycon generic `thenM` \ gen_info ->
+ returnM (tycon_name, DataTyDetails ctxt data_cons sel_ids gen_info)
+
+tcTyDecl (ForeignType {tcdName = tycon_name})
+ = returnM (tycon_name, ForeignTyDetails)
-tcTyDecl unf_env (ForeignType {tcdName = tycon_name})
- = returnTc (tycon_name, ForeignTyDetails)
+tcGenericInfo tycon generics -- Source code decl: consult the flag
+ = do_we_want generics `thenM` \ want_generics ->
+ if want_generics then
+ mapM (lookupSysName (tyConName tycon))
+ [mkGenOcc1, mkGenOcc2] `thenM` \ gen_sys_names ->
+ returnM (mkTyConGenInfo tycon gen_sys_names)
+ else
+ returnM Nothing
+ where
+ do_we_want (Just g) = returnM g -- Interface file decl
+ -- so look at decl
+ do_we_want Nothing = doptM Opt_Generics -- Source code decl
+ -- so look at flag
-mkRecordSelectors unf_env tycon data_cons
+mkRecordSelectors tycon data_cons
= -- We'll check later that fields with the same name
-- from different constructors have the same type.
- [ mkRecordSelId tycon field unpack_id unpackUtf8_id
+ [ mkRecordSelId tycon field
| field <- nubBy eq_name fields ]
where
- fields = [ field | con <- data_cons, field <- dataConFieldLabels con ]
+ fields = [ field | con <- visibleDataCons data_cons,
+ field <- dataConFieldLabels con ]
eq_name field1 field2 = fieldLabelName field1 == fieldLabelName field2
-
- unpack_id = tcLookupRecId unf_env unpackCStringName
- unpackUtf8_id = tcLookupRecId unf_env unpackCStringUtf8Name
-\end{code}
-
-
-%************************************************************************
-%* *
-\subsection{Validity check}
-%* *
-%************************************************************************
-
-checkValidTyCon is called once the mutually-recursive knot has been
-tied, so we can look at things freely.
-
-\begin{code}
-checkValidTyCon :: TyCon -> TcM ()
-checkValidTyCon tc
- | isSynTyCon tc = checkValidType (TySynCtxt name) syn_rhs
- | otherwise
- = -- Check the context on the data decl
- checkValidTheta (DataTyCtxt name) (tyConTheta tc) `thenTc_`
-
- -- Check arg types of data constructors
- mapTc_ check_data_con data_cons `thenTc_`
-
- -- Check that fields with the same name share a type
- mapTc_ check_fields groups
-
- where
- name = tyConName tc
- (_, syn_rhs) = getSynTyConDefn tc
- data_cons = tyConDataCons tc
-
- fields = [field | con <- data_cons, field <- dataConFieldLabels con]
- groups = equivClasses cmp_name fields
- cmp_name field1 field2 = fieldLabelName field1 `compare` fieldLabelName field2
-
- check_data_con con = checkValidType (ConArgCtxt (dataConName con))
- (idType (dataConWrapId con))
- -- This checks the argument types and
- -- the existential context (if any)
-
- check_fields fields@(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
- -- NB: this check assumes that all the constructors of a given
- -- data type use the same type variables
- checkTc (all (tcEqType field_ty) other_tys) (fieldTypeMisMatch field_name)
- where
- field_ty = fieldLabelType first_field_label
- field_name = fieldLabelName first_field_label
- other_tys = map fieldLabelType other_fields
\end{code}
-
%************************************************************************
%* *
\subsection{Kind and type check constructors}
%************************************************************************
\begin{code}
-kcConDetails :: NewOrData -> RenamedContext -> ConDetails Name -> TcM ()
+kcConDetails :: NewOrData -> RenamedContext
+ -> HsConDetails Name (BangType Name) -> TcM ()
kcConDetails new_or_data ex_ctxt details
- = kcHsContext ex_ctxt `thenTc_`
- mapTc_ kc_sig_type (conDetailsTys details)
+ = kcHsContext ex_ctxt `thenM_`
+ mappM_ kc_sig_type (conDetailsTys details)
where
kc_sig_type = case new_or_data of
DataType -> kcHsSigType
-- going to remove the constructor while coercing it to a lifted type.
-tcConDecl :: NewOrData -> TyCon -> [TyVar] -> ThetaType -> RenamedConDecl -> TcM DataCon
-tcConDecl new_or_data tycon tyvars ctxt (ConDecl name wkr_name ex_tvs ex_ctxt details src_loc)
- = tcAddSrcLoc src_loc $
- tcHsTyVars ex_tvs (kcConDetails new_or_data ex_ctxt details) $ \ ex_tyvars ->
- tcHsTheta ex_ctxt `thenTc` \ ex_theta ->
- case details of
- VanillaCon btys -> tc_datacon ex_tyvars ex_theta btys
- InfixCon bty1 bty2 -> tc_datacon ex_tyvars ex_theta [bty1,bty2]
- RecCon fields -> tc_rec_con ex_tyvars ex_theta fields
+tcConDecls :: NewOrData -> TyCon -> [TyVar] -> ThetaType
+ -> DataConDetails RenamedConDecl -> TcM (DataConDetails DataCon)
+
+tcConDecls new_or_data tycon tyvars ctxt con_decls
+ = case con_decls of
+ Unknown -> returnM Unknown
+ HasCons n -> returnM (HasCons n)
+ DataCons cs -> mappM tc_con_decl cs `thenM` \ data_cons ->
+ returnM (DataCons data_cons)
where
- tc_datacon ex_tyvars ex_theta btys
- = mapTc tcHsType (map getBangType btys) `thenTc` \ arg_tys ->
- mk_data_con ex_tyvars ex_theta (map getBangStrictness btys) arg_tys []
-
- tc_rec_con ex_tyvars ex_theta fields
- = checkTc (null ex_tyvars) (exRecConErr name) `thenTc_`
- mapTc tc_field (fields `zip` allFieldLabelTags) `thenTc` \ field_labels_s ->
- let
- field_labels = concat field_labels_s
- arg_stricts = [str | (ns, bty) <- fields,
- let str = getBangStrictness bty,
- n <- ns -- One for each. E.g x,y,z :: !Int
- ]
- in
- mk_data_con ex_tyvars ex_theta arg_stricts
- (map fieldLabelType field_labels) field_labels
-
- tc_field ((field_label_names, bty), tag)
- = tcHsType (getBangType bty) `thenTc` \ field_ty ->
- returnTc [mkFieldLabel (getName name) tycon field_ty tag | name <- field_label_names]
-
- mk_data_con ex_tyvars ex_theta arg_stricts arg_tys fields
- = let
- data_con = mkDataCon name arg_stricts fields
- tyvars (thinContext arg_tys ctxt)
- ex_tyvars ex_theta
- arg_tys
- tycon data_con_id data_con_wrap_id
-
- data_con_id = mkDataConId wkr_name data_con
- data_con_wrap_id = mkDataConWrapId data_con
- in
- returnNF_Tc data_con
+ tc_con_decl (ConDecl name ex_tvs ex_ctxt details src_loc)
+ = addSrcLoc src_loc $
+ tcHsTyVars ex_tvs (kcConDetails new_or_data ex_ctxt details) $ \ ex_tyvars ->
+ tcHsTheta ex_ctxt `thenM` \ ex_theta ->
+ case details of
+ PrefixCon btys -> tc_datacon ex_tyvars ex_theta btys
+ InfixCon bty1 bty2 -> tc_datacon ex_tyvars ex_theta [bty1,bty2]
+ RecCon fields -> tc_rec_con ex_tyvars ex_theta fields
+ where
+
+ tc_datacon ex_tyvars ex_theta btys
+ = mappM tcHsType (map getBangType btys) `thenM` \ arg_tys ->
+ tcMkDataCon name
+ (map getBangStrictness btys)
+ [{- No field labels -}]
+ tyvars ctxt ex_tyvars ex_theta
+ arg_tys tycon
+
+ tc_rec_con ex_tyvars ex_theta fields
+ = checkTc (null ex_tyvars) (exRecConErr name) `thenM_`
+ mappM tc_field (fields `zip` allFieldLabelTags) `thenM` \ field_labels ->
+ let
+ arg_stricts = [getBangStrictness bty | (n, bty) <- fields]
+ arg_tys = map fieldLabelType field_labels
+ in
+ tcMkDataCon name arg_stricts field_labels
+ tyvars ctxt ex_tyvars ex_theta
+ arg_tys tycon
+
+ tc_field ((field_label_name, bty), tag)
+ = tcHsType (getBangType bty) `thenM` \ field_ty ->
+ returnM (mkFieldLabel field_label_name tycon field_ty tag)
+
+tcMkDataCon :: Name
+ -> [StrictnessMark] -> [FieldLabel]
+ -> [TyVar] -> ThetaType
+ -> [TyVar] -> ThetaType
+ -> [Type] -> TyCon
+ -> TcM DataCon
+-- A wrapper for DataCon.mkDataCon that
+-- a) makes the worker Id
+-- b) makes the wrapper Id if necessary, including
+-- allocating its unique (hence monadic)
+tcMkDataCon src_name arg_stricts fields
+ tyvars ctxt ex_tyvars ex_theta
+ arg_tys tycon
+ = lookupSysName src_name mkDataConWrapperOcc `thenM` \ wrap_name ->
+ lookupSysName src_name mkDataConWorkerOcc `thenM` \ work_name ->
+ -- This last one takes the name of the data constructor in the source
+ -- code, which (for Haskell source anyway) will be in the SrcDataName name
+ -- space, and makes it into a "real data constructor name"
+ let
+ data_con = mkDataCon src_name arg_stricts fields
+ tyvars (thinContext arg_tys ctxt)
+ ex_tyvars ex_theta
+ arg_tys tycon
+ data_con_work_id data_con_wrap_id
+ data_con_work_id = mkDataConWorkId work_name data_con
+ data_con_wrap_id = mkDataConWrapId wrap_name data_con
+ in
+ returnM data_con
-- The context for a data constructor should be limited to
-- the type variables mentioned in the arg_tys
\begin{code}
-fieldTypeMisMatch field_name
- = sep [ptext SLIT("Different constructors give different types for field"), quotes (ppr field_name)]
-
exRecConErr name
= ptext SLIT("Can't combine named fields with locally-quantified type variables")
$$
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