\section[TcTyDecls]{Typecheck type declarations}
\begin{code}
-module TcTyDecls ( tcTyDecl, kcConDetails ) where
+module TcTyDecls ( tcTyDecl, kcConDetails, tcMkDataCon ) where
#include "HsVersions.h"
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, TyThingDetails(..) )
-import TcType ( tyVarsOfTypes, tyVarsOfPred, ThetaType )
+import TcType ( Type, tyVarsOfTypes, tyVarsOfPred, ThetaType )
import RnEnv ( lookupSysName )
import TcRnMonad
import DataCon ( DataCon, mkDataCon, dataConFieldLabels )
-import FieldLabel ( fieldLabelName, fieldLabelType, allFieldLabelTags, mkFieldLabel )
-import MkId ( mkDataConId, mkDataConWrapId, mkRecordSelId )
+import FieldLabel ( FieldLabel, fieldLabelName, fieldLabelType, allFieldLabelTags, mkFieldLabel )
+import MkId ( mkDataConWorkId, mkDataConWrapId, mkRecordSelId )
import Var ( TyVar )
import Name ( Name )
-import OccName ( mkWorkerOcc, mkGenOcc1, mkGenOcc2 )
+import OccName ( mkDataConWrapperOcc, mkDataConWorkerOcc,
+ mkGenOcc1, mkGenOcc2, setOccNameSpace )
import Outputable
import TyCon ( TyCon, DataConDetails(..), visibleDataCons,
tyConTyVars, tyConName )
tc_datacon ex_tyvars ex_theta btys
= mappM tcHsType (map getBangType btys) `thenM` \ arg_tys ->
- mk_data_con ex_tyvars ex_theta (map getBangStrictness btys) 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_`
+ = checkTc (null ex_tyvars) (exRecConErr name) `thenM_`
mappM tc_field (fields `zip` allFieldLabelTags) `thenM` \ field_labels ->
let
- arg_stricts = [str | (n, bty) <- fields,
- let str = getBangStrictness bty
- ]
+ arg_stricts = [getBangStrictness bty | (n, bty) <- fields]
+ arg_tys = map fieldLabelType field_labels
in
- mk_data_con ex_tyvars ex_theta arg_stricts
- (map fieldLabelType field_labels) field_labels
+ 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)
- mk_data_con ex_tyvars ex_theta arg_stricts arg_tys fields
- = lookupSysName name mkWorkerOcc `thenM` \ wkr_name ->
- 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
- returnM data_con
+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