\section[TcTyDecls]{Typecheck type declarations}
\begin{code}
-#include "HsVersions.h"
-
module TcTyDecls (
tcTyDecl,
tcConDecl,
mkDataBinds
) where
-IMP_Ubiq(){-uitous-}
+#include "HsVersions.h"
-import HsSyn ( TyDecl(..), ConDecl(..), ConDetails(..), BangType(..), HsExpr(..),
- Match(..), GRHSsAndBinds(..), GRHS(..), OutPat(..),
- HsBinds(..), HsLit, Stmt, DoOrListComp, ArithSeqInfo,
- SYN_IE(RecFlag), nonRecursive, andMonoBinds,
- HsType, Fake, InPat, HsTyVar, Fixity,
- MonoBinds(..), Sig
+import HsSyn ( MonoBinds(..),
+ TyDecl(..), ConDecl(..), ConDetails(..), BangType(..),
+ andMonoBinds
)
import HsTypes ( getTyVarName )
import RnHsSyn ( RenamedTyDecl(..), RenamedConDecl(..) )
import TcHsSyn ( mkHsTyLam, mkHsDictLam, tcIdType,
- SYN_IE(TcHsBinds), TcIdOcc(..), SYN_IE(TcMonoBinds)
+ TcHsBinds, TcMonoBinds
)
+import BasicTypes ( RecFlag(..), NewOrData(..) )
+
import Inst ( newDicts, InstOrigin(..), Inst )
import TcMonoType ( tcHsTypeKind, tcHsType, tcContext )
-import TcSimplify ( tcSimplifyThetas )
-import TcType ( tcInstTyVars, tcInstType, tcInstId )
-import TcEnv ( tcLookupTyCon, tcLookupTyVar, tcLookupClass,
+import TcSimplify ( tcSimplifyCheckThetas )
+import TcType ( tcInstTyVars )
+import TcEnv ( TcIdOcc(..), tcInstId,
+ tcLookupTyCon, tcLookupTyVar, tcLookupClass,
newLocalId, newLocalIds, tcLookupClassByKey
)
import TcMonad
-import TcKind ( TcKind, unifyKind, mkTcArrowKind, mkTcTypeKind )
+import TcKind ( TcKind, unifyKind, mkArrowKind, mkBoxedTypeKind )
-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 Class ( classInstEnv, Class )
import Id ( mkDataCon, dataConSig, mkRecordSelId, idType,
dataConFieldLabels, dataConStrictMarks,
StrictnessMark(..), getIdUnfolding,
- GenId{-instance NamedThing-},
- SYN_IE(Id)
+ Id
)
+import CoreUnfold ( getUnfoldingTemplate )
import FieldLabel
import Kind ( Kind, mkArrowKind, mkBoxedTypeKind )
-import SpecEnv ( SpecEnv, nullSpecEnv )
import Name ( nameSrcLoc, isLocallyDefined, getSrcLoc,
- OccName(..), Name{-instance Ord3-},
+ OccName(..),
NamedThing(..)
)
-import Outputable ( Outputable(..), interpp'SP )
-import Pretty
-import TyCon ( TyCon, NewOrData, mkSynTyCon, mkDataTyCon, isAlgTyCon,
+import Outputable
+import TyCon ( TyCon, 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 Type ( typeKind, getTyVar, tyVarsOfTypes, splitSigmaTy,
+ mkTyConApp, mkTyVarTys, mkForAllTys, mkFunTy,
+ splitFunTys, mkTyVarTy, getTyVar_maybe,
+ isUnboxedType, Type, ThetaType
)
-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(..) )
+import TyVar ( tyVarKind, elementOfTyVarSet, intersectTyVarSets, isEmptyTyVarSet,
+ TyVar )
+import Unique ( evalClassKey )
+import UniqSet ( emptyUniqSet, mkUniqSet, uniqSetToList, unionManyUniqSets, UniqSet )
+import Util ( equivClasses, zipEqual, nOfThem, panic, assertPanic )
\end{code}
\begin{code}
-tcTyDecl :: RenamedTyDecl -> TcM s TyCon
+tcTyDecl :: RecFlag -> RenamedTyDecl -> TcM s TyCon
\end{code}
Type synonym decls
~~~~~~~~~~~~~~~~~~
\begin{code}
-tcTyDecl (TySynonym tycon_name tyvar_names rhs src_loc)
+tcTyDecl is_rec (TySynonym tycon_name tyvar_names rhs src_loc)
= tcAddSrcLoc src_loc $
tcAddErrCtxt (tySynCtxt tycon_name) $
-- Unify tycon kind with (k1->...->kn->rhs)
unifyKind tycon_kind
- (foldr mkTcArrowKind rhs_kind tyvar_kinds)
+ (foldr mkArrowKind rhs_kind tyvar_kinds)
`thenTc_`
let
-- Getting the TyCon's kind is a bit of a nuisance. We can't use the tycon_kind,
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
\begin{code}
-tcTyDecl (TyData data_or_new context tycon_name tyvar_names con_decls derivings pragmas src_loc)
+tcTyDecl is_rec (TyData data_or_new context tycon_name tyvar_names con_decls derivings pragmas src_loc)
= tcAddSrcLoc src_loc $
- tcAddErrCtxt (tyDataCtxt tycon_name) $
+ let ctxt = case data_or_new of
+ NewType -> tyNewCtxt tycon_name
+ DataType -> tyDataCtxt tycon_name
+ in
+ tcAddErrCtxt ctxt $
-- Lookup the pieces
tcLookupTyCon tycon_name `thenTc` \ (tycon_kind, _, rec_tycon) ->
-- Unify tycon kind with (k1->...->kn->Type)
unifyKind tycon_kind
- (foldr mkTcArrowKind mkTcTypeKind tyvar_kinds)
+ (foldr mkArrowKind mkBoxedTypeKind tyvar_kinds)
`thenTc_`
-- Walk the condecls
ctxt
con_ids
derived_classes
+ Nothing -- Not a dictionary
data_or_new
+ is_rec
in
returnTc tycon
-- groups is list of fields that share a common name
groups = equivClasses cmp_name fields
cmp_name (_, field1) (_, field2)
- = fieldLabelName field1 `cmp` fieldLabelName field2
+ = fieldLabelName field1 `compare` fieldLabelName field2
\end{code}
-- Check that all the types of all the strict arguments are in Eval
| 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
+ strict_marks = dataConStrictMarks con_id
+ (tyvars, theta, ext_tyvars, ext_theta, arg_tys, _) = dataConSig con_id
- eval_theta = [ (eval_clas,arg_ty)
+ eval_theta = [ (eval_clas, [arg_ty])
| (arg_ty, MarkedStrict) <- zipEqual "strict_args"
- arg_tys strict_marks
+ arg_tys strict_marks
]
in
- tcSimplifyThetas classInstEnv theta eval_theta `thenTc` \ eval_theta' ->
- checkTc (null eval_theta')
- (missingEvalErr con_id eval_theta')
+ tcAddErrCtxt (evalCtxt con_id eval_theta) $
+ tcSimplifyCheckThetas theta eval_theta
\end{code}
\begin{code}
-- 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 (== field_ty) other_tys)
(fieldTypeMisMatch field_name) `thenTc_`
returnTc selector_id
where
field_name = fieldLabelName first_field_label
other_tys = [fieldLabelType fl | (_, fl) <- other_fields]
(tyvars, _, _, _, _, _) = dataConSig first_con
- data_ty = applyTyCon tycon (mkTyVarTys tyvars)
+ data_ty = mkTyConApp tycon (mkTyVarTys tyvars)
-- tyvars of first_con may be free in field_ty
-- Now build the selector
Constructors
~~~~~~~~~~~~
\begin{code}
-tcConDecl :: TyCon -> [TyVar] -> [(Class,Type)] -> RenamedConDecl -> TcM s Id
+tcConDecl :: TyCon -> [TyVar] -> ThetaType -> RenamedConDecl -> TcM s Id
tcConDecl tycon tyvars ctxt (ConDecl name ex_ctxt (VanillaCon btys) src_loc)
= tcDataCon tycon tyvars ctxt name btys src_loc
tcConDecl tycon tyvars ctxt (ConDecl name ex_ctxt (NewCon ty) src_loc)
= tcAddSrcLoc src_loc $
tcHsType ty `thenTc` \ arg_ty ->
+ -- can't allow an unboxed type here, because we're effectively
+ -- going to remove the constructor while coercing it to a boxed type.
+ checkTc (not (isUnboxedType arg_ty)) (newTypeUnboxedField ty) `thenTc_`
let
data_con = mkDataCon (getName name)
[NotMarkedStrict]
[{- No labelled fields -}]
tyvars
ctxt
- [] [] -- Temporary
+ [] [] -- Temporary; existential chaps
[arg_ty]
tycon
in
field_labels
tyvars
(thinContext arg_tys ctxt)
- [] [] -- Temporary
+ [] [] -- Temporary; existential chaps
arg_tys
tycon
in
[{- No field labels -}]
tyvars
(thinContext arg_tys ctxt)
- [] [] -- Temporary
+ [] [] -- Temporary existential chaps
arg_tys
tycon
in
= filter in_arg_tys ctxt
where
arg_tyvars = tyVarsOfTypes arg_tys
- in_arg_tys (clas,ty) = getTyVar "tcDataCon" ty `elementOfTyVarSet` arg_tyvars
+ in_arg_tys (clas,tys) = not $ isEmptyTyVarSet $
+ tyVarsOfTypes tys `intersectTyVarSets` arg_tyvars
get_strictness (Banged _) = MarkedStrict
get_strictness (Unbanged _) = NotMarkedStrict
Errors and contexts
~~~~~~~~~~~~~~~~~~~
\begin{code}
-tySynCtxt tycon_name sty
- = hsep [ptext SLIT("In the type declaration for"), ppr sty tycon_name]
+tySynCtxt tycon_name
+ = hsep [ptext SLIT("In the type declaration for"), quotes (ppr tycon_name)]
+
+tyDataCtxt tycon_name
+ = hsep [ptext SLIT("In the data declaration for"), quotes (ppr tycon_name)]
-tyDataCtxt tycon_name sty
- = hsep [ptext SLIT("In the data declaration for"), ppr sty tycon_name]
+tyNewCtxt tycon_name
+ = hsep [ptext SLIT("In the newtype declaration for"), quotes (ppr tycon_name)]
-tyNewCtxt tycon_name sty
- = hsep [ptext SLIT("In the newtype declaration for"), ppr sty tycon_name]
+fieldTypeMisMatch field_name
+ = sep [ptext SLIT("Declared types differ for field"), quotes (ppr field_name)]
-fieldTypeMisMatch field_name sty
- = sep [ptext SLIT("Declared types differ for field"), ppr sty field_name]
+newTypeUnboxedField ty
+ = sep [ptext SLIT("Newtype constructor field has an unboxed type:"),
+ quotes (ppr ty)]
-missingEvalErr con eval_theta sty
- = hsep [ptext SLIT("Missing Eval context for constructor"),
- ppr sty con,
- char ':', ppr sty eval_theta]
+evalCtxt con eval_theta
+ = hsep [ptext SLIT("When checking the Eval context for constructor:"),
+ ppr con,
+ text "::", ppr eval_theta]
\end{code}
projects / ghc-hetmet.git / blobdiff