\section[TcInstDecls]{Typechecking instance declarations}
\begin{code}
-#include "HsVersions.h"
-
module TcInstDcls (
tcInstDecls1,
tcInstDecls2
) where
+#include "HsVersions.h"
-IMP_Ubiq()
-
-import HsSyn ( HsDecl(..), InstDecl(..), TyDecl, ClassDecl, DefaultDecl,
- FixityDecl, IfaceSig, Sig(..),
- SpecInstSig(..), HsBinds(..),
- MonoBinds(..), GRHSsAndBinds(..), GRHS(..), Match,
- InPat(..), OutPat(..), HsExpr(..), HsLit(..),
- Stmt, DoOrListComp, ArithSeqInfo, Fake, Fixity,
- HsType(..), HsTyVar,
- SYN_IE(RecFlag), recursive, nonRecursive, collectMonoBinders,
- andMonoBinds
+import HsSyn ( HsDecl(..), InstDecl(..),
+ HsBinds(..), MonoBinds(..), GRHSsAndBinds(..), GRHS(..),
+ HsExpr(..), InPat(..), HsLit(..), Sig(..),
+ unguardedRHS,
+ collectMonoBinders, andMonoBinds
+ )
+import HsBinds ( sigsForMe )
+import RnHsSyn ( RenamedHsBinds, RenamedMonoBinds,
+ RenamedInstDecl, RenamedHsExpr,
+ RenamedSig, RenamedHsDecl
)
-import RnHsSyn ( SYN_IE(RenamedHsBinds), SYN_IE(RenamedMonoBinds),
- SYN_IE(RenamedInstDecl), SYN_IE(RenamedFixityDecl), SYN_IE(RenamedHsExpr),
- SYN_IE(RenamedSig), SYN_IE(RenamedSpecInstSig), SYN_IE(RenamedHsDecl)
+import TcHsSyn ( TcMonoBinds, TcIdOcc(..), TcIdBndr,
+ maybeBoxedPrimType, tcIdType
)
-import TcHsSyn ( SYN_IE(TcHsBinds),
- SYN_IE(TcMonoBinds), SYN_IE(TcExpr), tcIdType,
- mkHsTyLam, mkHsTyApp,
- mkHsDictLam, mkHsDictApp )
import TcBinds ( tcPragmaSigs )
import TcClassDcl ( tcMethodBind, badMethodErr )
import TcMonad
-import RnMonad ( SYN_IE(RnNameSupply) )
-import Inst ( Inst, InstOrigin(..), SYN_IE(InstanceMapper),
- instToId, newDicts, newMethod, SYN_IE(LIE), emptyLIE, plusLIE )
-import PragmaInfo ( PragmaInfo(..) )
+import RnMonad ( RnNameSupply )
+import Inst ( Inst, InstOrigin(..),
+ newDicts, LIE, emptyLIE, plusLIE, plusLIEs )
import TcDeriv ( tcDeriving )
-import TcEnv ( tcLookupClass, newLocalId, tcExtendGlobalTyVars, tcGetGlobalTyVars,
- tcExtendGlobalValEnv, tcAddImportedIdInfo
- )
-import SpecEnv ( SpecEnv )
-import TcGRHSs ( tcGRHSsAndBinds )
-import TcInstUtil ( InstInfo(..), mkInstanceRelatedIds, buildInstanceEnvs )
+import TcEnv ( tcExtendGlobalValEnv, tcAddImportedIdInfo )
+import TcInstUtil ( InstInfo(..), mkInstanceRelatedIds, classDataCon )
import TcKind ( TcKind, unifyKind )
-import TcMatches ( tcMatchesFun )
-import TcMonoType ( tcTyVarScope, tcContext, tcHsTypeKind )
+import TcMonoType ( tcHsType )
import TcSimplify ( tcSimplifyAndCheck )
-import TcType ( TcIdOcc(..), SYN_IE(TcIdBndr), SYN_IE(TcType), SYN_IE(TcTyVar), SYN_IE(TcTyVarSet),
- tcInstSigTyVars, tcInstType, tcInstSigTcType,
- tcInstTheta, tcInstTcType, tcInstSigType
+import TcType ( TcType, TcTyVar, TcTyVarSet,
+ zonkSigTyVar, tcInstSigTyVars, tcInstType, tcInstTheta
)
-import Unify ( unifyTauTy, unifyTauTyLists )
-
import Bag ( emptyBag, unitBag, unionBags, unionManyBags,
- concatBag, foldBag, bagToList, listToBag,
- Bag )
-import CmdLineOpts ( opt_GlasgowExts,
- opt_PprUserLength, opt_SpecialiseOverloaded,
- opt_WarnMissingMethods
+ foldBag, bagToList, Bag
)
-import Class ( GenClass,
- classBigSig,
- classDefaultMethodId, SYN_IE(Class)
- )
-import Id ( GenId, idType, replacePragmaInfo,
- isNullaryDataCon, dataConArgTys, SYN_IE(Id) )
-import ListSetOps ( minusList )
-import Maybes ( maybeToBool, expectJust, seqMaybe, catMaybes )
-import Name ( nameOccName, getSrcLoc, mkLocalName,
- isLocallyDefined, OccName, Name{--O only-}, SYN_IE(Module),
+import CmdLineOpts ( opt_GlasgowExts, opt_WarnMissingMethods )
+import Class ( classBigSig, Class )
+import Id ( isNullaryDataCon, dataConArgTys, replaceIdInfo, idName, Id )
+import Maybes ( maybeToBool, seqMaybe, catMaybes )
+import Name ( nameOccName, mkLocalName,
+ isLocallyDefined, Module,
NamedThing(..)
)
-import PrelVals ( nO_EXPLICIT_METHOD_ERROR_ID, nO_DEFAULT_METHOD_ERROR_ID )
-import PprType ( GenType, GenTyVar, GenClass, TyCon,
- pprParendGenType
- )
-import Outputable
+import PrelVals ( nO_METHOD_BINDING_ERROR_ID, eRROR_ID )
+import PprType ( pprParendType, pprConstraint )
import SrcLoc ( SrcLoc, noSrcLoc )
-import Pretty
-import TyCon ( isSynTyCon, isDataTyCon, derivedClasses )
-import Type ( GenType(..), SYN_IE(ThetaType), mkTyVarTys, isPrimType,
- splitSigmaTy, splitAppTys, isTyVarTy, matchTy, mkSigmaTy,
- getTyCon_maybe, maybeAppTyCon, SYN_IE(Type), getTyVar,
- maybeBoxedPrimType, maybeAppDataTyCon, splitRhoTy, eqTy
+import TyCon ( isSynTyCon, isDataTyCon, tyConDerivings )
+import Type ( Type, ThetaType, isUnpointedType,
+ splitSigmaTy, isTyVarTy, mkSigmaTy,
+ splitTyConApp_maybe, splitDictTy_maybe,
+ splitAlgTyConApp_maybe, splitRhoTy,
+ tyVarsOfTypes
)
-import TyVar ( GenTyVar, SYN_IE(GenTyVarSet), tyVarSetToList,
- mkTyVarSet, unionTyVarSets, SYN_IE(TyVar) )
+import TyVar ( zipTyVarEnv, mkTyVarSet, tyVarSetToList, TyVar )
import TysPrim ( byteArrayPrimTyCon, mutableByteArrayPrimTyCon )
import TysWiredIn ( stringTy )
import Unique ( Unique, cCallableClassKey, cReturnableClassKey, Uniquable(..) )
-import Util ( zipEqual, panic, pprPanic, pprTrace, removeDups, Ord3(..)
-#if __GLASGOW_HASKELL__ < 202
- , trace
-#endif
- )
+import Outputable
\end{code}
Typechecking instance declarations is done in two passes. The first
-> RnNameSupply -- for renaming derivings
-> TcM s (Bag InstInfo,
RenamedHsBinds,
- PprStyle -> Doc)
+ SDoc)
tcInstDecls1 unf_env decls mod_name rn_name_supply
= -- Do the ordinary instance declarations
recoverNF_Tc (returnNF_Tc emptyBag) $
tcAddSrcLoc src_loc $
- -- Look things up
- tcLookupClass class_name `thenTc` \ (clas_kind, clas) ->
-
- -- Typecheck the context and instance type
- tcTyVarScope tyvar_names (\ tyvars ->
- tcContext context `thenTc` \ theta ->
- tcHsTypeKind inst_ty `thenTc` \ (tau_kind, tau) ->
- unifyKind clas_kind tau_kind `thenTc_`
- returnTc (tyvars, theta, tau)
- ) `thenTc` \ (inst_tyvars, inst_theta, inst_tau) ->
+ -- Type-check all the stuff before the "where"
+ tcHsType poly_ty `thenTc` \ poly_ty' ->
+ let
+ (tyvars, theta, dict_ty) = splitSigmaTy poly_ty'
+ (clas, inst_tys) = case splitDictTy_maybe dict_ty of
+ Nothing -> pprPanic "tcInstDecl1" (ppr poly_ty)
+ Just pair -> pair
+ in
-- Check for respectable instance type
- scrutiniseInstanceType dfun_name clas inst_tau
- `thenTc` \ (inst_tycon,arg_tys) ->
+ scrutiniseInstanceType clas inst_tys `thenTc_`
-- Make the dfun id and constant-method ids
let
(dfun_id, dfun_theta) = mkInstanceRelatedIds dfun_name
- clas inst_tyvars inst_tau inst_theta
+ clas tyvars inst_tys theta
-- Add info from interface file
final_dfun_id = tcAddImportedIdInfo unf_env dfun_id
in
- returnTc (unitBag (InstInfo clas inst_tyvars inst_tau inst_theta
- dfun_theta final_dfun_id
+ returnTc (unitBag (InstInfo clas tyvars inst_tys theta
+ dfun_theta final_dfun_id
binds src_loc uprags))
- where
- (tyvar_names, context, dict_ty) = case poly_ty of
- HsForAllTy tvs cxt dict_ty -> (tvs, cxt, dict_ty)
- other -> ([], [], poly_ty)
- (class_name, inst_ty) = case dict_ty of
- MonoDictTy cls ty -> (cls,ty)
- other -> pprPanic "Malformed instance decl" (ppr PprDebug poly_ty)
\end{code}
\begin{code}
tcInstDecl2 :: InstInfo -> NF_TcM s (LIE s, TcMonoBinds s)
-tcInstDecl2 (InstInfo clas inst_tyvars inst_ty
+tcInstDecl2 (InstInfo clas inst_tyvars inst_tys
inst_decl_theta dfun_theta
dfun_id monobinds
locn uprags)
tcAddSrcLoc locn $
-- Get the class signature
- tcInstSigTyVars inst_tyvars `thenNF_Tc` \ (inst_tyvars', _, tenv) ->
let
origin = InstanceDeclOrigin
- (class_tyvar,
- super_classes, sc_sel_ids,
+ (class_tyvars,
+ sc_theta, sc_sel_ids,
op_sel_ids, defm_ids) = classBigSig clas
in
- tcInstType tenv inst_ty `thenNF_Tc` \ inst_ty' ->
+
+ -- Instantiate the instance decl with tc-style type variables
+ tcInstSigTyVars inst_tyvars `thenNF_Tc` \ (inst_tyvars', _, tenv) ->
+ mapNF_Tc (tcInstType tenv) inst_tys `thenNF_Tc` \ inst_tys' ->
tcInstTheta tenv dfun_theta `thenNF_Tc` \ dfun_theta' ->
tcInstTheta tenv inst_decl_theta `thenNF_Tc` \ inst_decl_theta' ->
- let
- sc_theta' = super_classes `zip` repeat inst_ty'
- in
+
+ -- Instantiate the super-class context with inst_tys
+ tcInstTheta (zipTyVarEnv class_tyvars inst_tys') sc_theta `thenNF_Tc` \ sc_theta' ->
+
-- Create dictionary Ids from the specified instance contexts.
newDicts origin sc_theta' `thenNF_Tc` \ (sc_dicts, sc_dict_ids) ->
newDicts origin dfun_theta' `thenNF_Tc` \ (dfun_arg_dicts, dfun_arg_dicts_ids) ->
newDicts origin inst_decl_theta' `thenNF_Tc` \ (inst_decl_dicts, _) ->
- newDicts origin [(clas,inst_ty')] `thenNF_Tc` \ (this_dict, [this_dict_id]) ->
-
- -- Now process any INLINE or SPECIALIZE pragmas for the methods
- -- ...[NB May 97; all ignored except INLINE]
- tcPragmaSigs uprags `thenTc` \ (prag_fn, spec_binds, spec_lie) ->
+ newDicts origin [(clas,inst_tys')] `thenNF_Tc` \ (this_dict, [this_dict_id]) ->
-- Check that all the method bindings come from this class
let
- inst_tyvars_set' = mkTyVarSet inst_tyvars'
check_from_this_class (bndr, loc)
- | nameOccName bndr `elem` sel_names = returnTc ()
- | otherwise = recoverTc (returnTc ()) $
- tcAddSrcLoc loc $
- failTc (badMethodErr bndr clas)
+ | nameOccName bndr `elem` sel_names = returnNF_Tc ()
+ | otherwise = tcAddSrcLoc loc $
+ addErrTc (badMethodErr bndr clas)
sel_names = map getOccName op_sel_ids
+ bndrs = bagToList (collectMonoBinders monobinds)
in
- mapTc check_from_this_class (bagToList (collectMonoBinders monobinds)) `thenTc_`
+ mapNF_Tc check_from_this_class bndrs `thenNF_Tc_`
- -- Type check the method bindings themselves
- tcExtendGlobalTyVars inst_tyvars_set' (
- tcExtendGlobalValEnv (catMaybes defm_ids) $
- -- Default-method Ids may be mentioned in synthesised RHSs
+ tcExtendGlobalValEnv (catMaybes defm_ids) (
- mapAndUnzip3Tc (tcInstMethodBind clas inst_ty' monobinds)
+ -- Default-method Ids may be mentioned in synthesised RHSs
+ mapAndUnzip3Tc (tcInstMethodBind clas inst_tys' inst_tyvars' monobinds uprags)
(op_sel_ids `zip` defm_ids)
) `thenTc` \ (method_binds_s, insts_needed_s, meth_lies_w_ids) ->
+ -- Deal with SPECIALISE instance pragmas
+ let
+ dfun_prags = [Sig (idName dfun_id) ty loc | SpecInstSig ty loc <- uprags]
+ in
+ tcExtendGlobalValEnv [dfun_id] (
+ tcPragmaSigs dfun_prags
+ ) `thenTc` \ (prag_info_fn, prag_binds, prag_lie) ->
+
-- Check the overloading constraints of the methods and superclasses
+ mapNF_Tc zonkSigTyVar inst_tyvars' `thenNF_Tc` \ zonked_inst_tyvars ->
+
let
+ inst_tyvars_set = mkTyVarSet zonked_inst_tyvars
+
(meth_lies, meth_ids) = unzip meth_lies_w_ids
- avail_insts -- These insts are in scope; quite a few, eh?
- = this_dict `plusLIE` dfun_arg_dicts `plusLIE` unionManyBags meth_lies
+
+ -- These insts are in scope; quite a few, eh?
+ avail_insts = this_dict `plusLIE`
+ dfun_arg_dicts `plusLIE`
+ sc_dicts `plusLIE`
+ unionManyBags meth_lies
+
+ methods_lie = plusLIEs insts_needed_s
in
- tcAddErrCtxt bindSigCtxt (
- tcSimplifyAndCheck
- inst_tyvars_set' -- Local tyvars
- avail_insts
- (sc_dicts `unionBags`
- unionManyBags insts_needed_s) -- Need to get defns for all these
- ) `thenTc` \ (const_lie, super_binds) ->
-- Check that we *could* construct the superclass dictionaries,
-- even though we are *actually* going to pass the superclass dicts in;
-- the check ensures that the caller will never have a problem building
-- them.
- tcAddErrCtxt superClassSigCtxt (
- tcSimplifyAndCheck
- inst_tyvars_set' -- Local tyvars
+ tcAddErrCtxt superClassCtxt (
+ tcSimplifyAndCheck
+ (ptext SLIT("instance declaration context"))
+ inst_tyvars_set -- Local tyvars
inst_decl_dicts -- The instance dictionaries available
sc_dicts -- The superclass dicationaries reqd
) `thenTc_`
- -- Ignore the result; we're only doing
+ -- Ignore the result; we're only doing
-- this to make sure it can be done.
+ -- Ditto method bindings
+ tcAddErrCtxt methodCtxt (
+ tcSimplifyAndCheck
+ (ptext SLIT("instance declaration context"))
+ inst_tyvars_set -- Local tyvars
+ avail_insts
+ methods_lie
+ ) `thenTc_`
+
+ -- Now do the simplification again, this time to get the
+ -- bindings; this time we use an enhanced "avails"
+ -- Ignore errors because they come from the *previous* tcSimplifys
+ discardErrsTc (
+ tcSimplifyAndCheck
+ (ptext SLIT("instance declaration context"))
+ inst_tyvars_set
+ dfun_arg_dicts -- NB! Don't include this_dict here, else the sc_dicts
+ -- get bound by just selecting from this_dict!!
+ (sc_dicts `plusLIE` methods_lie `plusLIE` prag_lie)
+ ) `thenTc` \ (const_lie, lie_binds) ->
+
+
-- Create the result bindings
let
- dict_bind = VarMonoBind this_dict_id (Dictionary sc_dict_ids meth_ids)
+ dict_constr = classDataCon clas
+ scs_and_meths = sc_dict_ids ++ meth_ids
+
+ dict_rhs
+ | null scs_and_meths
+ = -- Blatant special case for CCallable, CReturnable
+ -- If the dictionary is empty then we should never
+ -- select anything from it, so we make its RHS just
+ -- emit an error message. This in turn means that we don't
+ -- mention the constructor, which doesn't exist for CCallable, CReturnable
+ -- Hardly beautiful, but only three extra lines.
+ HsApp (TyApp (HsVar (RealId eRROR_ID)) [tcIdType this_dict_id])
+ (HsLitOut (HsString msg) stringTy)
+
+ | otherwise -- The common case
+ = foldl HsApp (TyApp (HsVar (RealId dict_constr)) inst_tys')
+ (map HsVar (sc_dict_ids ++ meth_ids))
+ -- We don't produce a binding for the dict_constr; instead we
+ -- rely on the simplifier to unfold this saturated application
+ where
+ msg = _PK_ ("Compiler error: bad dictionary " ++ showSDoc (ppr clas))
+
+ dict_bind = VarMonoBind this_dict_id dict_rhs
method_binds = andMonoBinds method_binds_s
+ final_dfun_id = replaceIdInfo dfun_id (prag_info_fn (idName dfun_id))
+ -- Pretty truesome
main_bind
= AbsBinds
- inst_tyvars'
+ zonked_inst_tyvars
dfun_arg_dicts_ids
- [(inst_tyvars', RealId dfun_id, this_dict_id)]
- (super_binds `AndMonoBinds`
+ [(inst_tyvars', RealId final_dfun_id, this_dict_id)]
+ (lie_binds `AndMonoBinds`
method_binds `AndMonoBinds`
+ prag_binds `AndMonoBinds`
dict_bind)
in
- returnTc (const_lie `plusLIE` spec_lie,
- main_bind `AndMonoBinds` spec_binds)
+ returnTc (const_lie,
+ main_bind `AndMonoBinds` prag_binds)
\end{code}
\begin{code}
tcInstMethodBind
:: Class
- -> TcType s -- Instance type
+ -> [TcType s] -- Instance types
+ -> [TcTyVar s] -- and their free (sig) tyvars
-> RenamedMonoBinds -- Method binding
+ -> [RenamedSig] -- Pragmas
-> (Id, Maybe Id) -- Selector id and default-method id
-> TcM s (TcMonoBinds s, LIE s, (LIE s, TcIdOcc s))
-tcInstMethodBind clas inst_ty meth_binds (sel_id, maybe_dm_id)
+tcInstMethodBind clas inst_tys inst_tyvars meth_binds prags (sel_id, maybe_dm_id)
= tcGetSrcLoc `thenNF_Tc` \ loc ->
tcGetUnique `thenNF_Tc` \ uniq ->
let
- meth_occ = getOccName sel_id
+ sel_name = idName sel_id
+ meth_occ = getOccName sel_name
default_meth_name = mkLocalName uniq meth_occ loc
- maybe_meth_bind = find meth_occ meth_binds
+ maybe_meth_bind = find sel_name meth_binds
the_meth_bind = case maybe_meth_bind of
Just stuff -> stuff
- Nothing -> mk_default_bind default_meth_name
+ Nothing -> mk_default_bind default_meth_name loc
+ meth_prags = sigsForMe (== sel_name) prags
in
-- Warn if no method binding, only if -fwarn-missing-methods
- warnTc (opt_WarnMissingMethods &&
+ warnTc (opt_WarnMissingMethods &&
not (maybeToBool maybe_meth_bind) &&
not (maybeToBool maybe_dm_id))
(omittedMethodWarn sel_id clas) `thenNF_Tc_`
-- Typecheck the method binding
- tcMethodBind clas origin inst_ty sel_id the_meth_bind
+ tcMethodBind clas origin inst_tys inst_tyvars sel_id the_meth_bind meth_prags
where
origin = InstanceDeclOrigin -- Poor
- find occ EmptyMonoBinds = Nothing
- find occ (AndMonoBinds b1 b2) = find occ b1 `seqMaybe` find occ b2
+ find sel EmptyMonoBinds = Nothing
+ find sel (AndMonoBinds b1 b2) = find sel b1 `seqMaybe` find sel b2
- find occ b@(FunMonoBind op_name _ _ _) | nameOccName op_name == occ = Just b
- | otherwise = Nothing
- find occ b@(PatMonoBind (VarPatIn op_name) _ _) | nameOccName op_name == occ = Just b
- | otherwise = Nothing
- find occ other = panic "Urk! Bad instance method binding"
+ find sel b@(FunMonoBind op_name _ _ _) | op_name == sel = Just b
+ | otherwise = Nothing
+ find sel b@(PatMonoBind (VarPatIn op_name) _ _) | op_name == sel = Just b
+ | otherwise = Nothing
+ find sel other = panic "Urk! Bad instance method binding"
- mk_default_bind local_meth_name
+ mk_default_bind local_meth_name loc
= PatMonoBind (VarPatIn local_meth_name)
- (GRHSsAndBindsIn [OtherwiseGRHS default_expr noSrcLoc] EmptyBinds)
- noSrcLoc
+ (GRHSsAndBindsIn (unguardedRHS (default_expr loc) loc) EmptyBinds)
+ loc
- default_expr = case maybe_dm_id of
- Just dm_id -> HsVar (getName dm_id) -- There's a default method
- Nothing -> error_expr -- No default method
+ default_expr loc
+ = case maybe_dm_id of
+ Just dm_id -> HsVar (getName dm_id) -- There's a default method
+ Nothing -> error_expr loc -- No default method
- error_expr = HsApp (HsVar (getName nO_DEFAULT_METHOD_ERROR_ID))
- (HsLit (HsString (_PK_ error_msg)))
+ error_expr loc
+ = HsApp (HsVar (getName nO_METHOD_BINDING_ERROR_ID))
+ (HsLit (HsString (_PK_ (error_msg loc))))
- error_msg = show (hcat [ppr (PprForUser opt_PprUserLength) (getSrcLoc sel_id), text "|",
- ppr (PprForUser opt_PprUserLength) sel_id
- ])
+ error_msg loc = showSDoc (hcat [ppr loc, text "|", ppr sel_id ])
\end{code}
%************************************************************************
%* *
-\subsection{Type-checking specialise instance pragmas}
+\subsection{Checking for a decent instance type}
%* *
%************************************************************************
-\begin{code}
-{- LATER
-tcSpecInstSigs :: E -> CE -> TCE
- -> Bag InstInfo -- inst decls seen (declared and derived)
- -> [RenamedSpecInstSig] -- specialise instance upragmas
- -> TcM (Bag InstInfo) -- new, overlapped, inst decls
-
-tcSpecInstSigs e ce tce inst_infos []
- = returnTc emptyBag
-
-tcSpecInstSigs e ce tce inst_infos sigs
- = buildInstanceEnvs inst_infos `thenTc` \ inst_mapper ->
- tc_inst_spec_sigs inst_mapper sigs `thenNF_Tc` \ spec_inst_infos ->
- returnTc spec_inst_infos
- where
- tc_inst_spec_sigs inst_mapper []
- = returnNF_Tc emptyBag
- tc_inst_spec_sigs inst_mapper (sig:sigs)
- = tcSpecInstSig e ce tce inst_infos inst_mapper sig `thenNF_Tc` \ info_sig ->
- tc_inst_spec_sigs inst_mapper sigs `thenNF_Tc` \ info_sigs ->
- returnNF_Tc (info_sig `unionBags` info_sigs)
-
-tcSpecInstSig :: E -> CE -> TCE
- -> Bag InstInfo
- -> InstanceMapper
- -> RenamedSpecInstSig
- -> NF_TcM (Bag InstInfo)
-
-tcSpecInstSig e ce tce inst_infos inst_mapper (SpecInstSig class_name ty src_loc)
- = recoverTc emptyBag (
- tcAddSrcLoc src_loc (
- let
- clas = lookupCE ce class_name -- Renamer ensures this can't fail
-
- -- Make some new type variables, named as in the specialised instance type
- ty_names = extractHsTyNames ???is_tyvarish_name??? ty
- (tmpl_e,inst_tmpls,inst_tmpl_tys) = mkTVE ty_names
- in
- babyTcMtoTcM (tcInstanceType ce tce tmpl_e True src_loc ty)
- `thenTc` \ inst_ty ->
- let
- maybe_tycon = case maybeAppDataTyCon inst_ty of
- Just (tc,_,_) -> Just tc
- Nothing -> Nothing
-
- maybe_unspec_inst = lookup_unspec_inst clas maybe_tycon inst_infos
- in
- -- Check that we have a local instance declaration to specialise
- checkMaybeTc maybe_unspec_inst
- (specInstUnspecInstNotFoundErr clas inst_ty src_loc) `thenTc_`
-
- -- Create tvs to substitute for tmpls while simplifying the context
- copyTyVars inst_tmpls `thenNF_Tc` \ (tv_e, inst_tvs, inst_tv_tys) ->
- let
- Just (InstInfo _ unspec_tyvars unspec_inst_ty unspec_theta
- _ _ binds _ uprag) = maybe_unspec_inst
-
- subst = case matchTy unspec_inst_ty inst_ty of
- Just subst -> subst
- Nothing -> panic "tcSpecInstSig:matchTy"
-
- subst_theta = instantiateThetaTy subst unspec_theta
- subst_tv_theta = instantiateThetaTy tv_e subst_theta
-
- mk_spec_origin clas ty
- = InstanceSpecOrigin inst_mapper clas ty src_loc
- -- I'm VERY SUSPICIOUS ABOUT THIS
- -- the inst-mapper is in a knot at this point so it's no good
- -- looking at it in tcSimplify...
- in
- tcSimplifyThetas mk_spec_origin subst_tv_theta
- `thenTc` \ simpl_tv_theta ->
- let
- simpl_theta = [ (clas, tv_to_tmpl tv) | (clas, tv) <- simpl_tv_theta ]
-
- tv_tmpl_map = zipEqual "tcSpecInstSig" inst_tv_tys inst_tmpl_tys
- tv_to_tmpl tv = assoc "tcSpecInstSig" tv_tmpl_map tv
- in
- mkInstanceRelatedIds
- clas inst_tmpls inst_ty simpl_theta uprag
- `thenNF_Tc` \ (dfun_id, dfun_theta, const_meth_ids) ->
-
- getSwitchCheckerTc `thenNF_Tc` \ sw_chkr ->
- (if sw_chkr SpecialiseTrace then
- pprTrace "Specialised Instance: "
- (vcat [hsep [if null simpl_theta then empty else ppr PprDebug simpl_theta,
- if null simpl_theta then empty else ptext SLIT("=>"),
- ppr PprDebug clas,
- pprParendGenType PprDebug inst_ty],
- hsep [ptext SLIT(" derived from:"),
- if null unspec_theta then empty else ppr PprDebug unspec_theta,
- if null unspec_theta then empty else ptext SLIT("=>"),
- ppr PprDebug clas,
- pprParendGenType PprDebug unspec_inst_ty]])
- else id) (
-
- returnTc (unitBag (InstInfo clas inst_tmpls inst_ty simpl_theta
- dfun_theta dfun_id
- binds src_loc uprag))
- )))
-
-
-lookup_unspec_inst clas maybe_tycon inst_infos
- = case filter (match_info match_inst_ty) (bagToList inst_infos) of
- [] -> Nothing
- (info:_) -> Just info
- where
- match_info match_ty (InstInfo inst_clas _ inst_ty _ _ _ _ _ from_here _ _ _)
- = from_here && clas == inst_clas &&
- match_ty inst_ty && is_plain_instance inst_ty
-
- match_inst_ty = case maybe_tycon of
- Just tycon -> match_tycon tycon
- Nothing -> match_fun
-
- match_tycon tycon inst_ty = case (maybeAppDataTyCon inst_ty) of
- Just (inst_tc,_,_) -> tycon == inst_tc
- Nothing -> False
-
- match_fun inst_ty = isFunType inst_ty
-
-
-is_plain_instance inst_ty
- = case (maybeAppDataTyCon inst_ty) of
- Just (_,tys,_) -> all isTyVarTemplateTy tys
- Nothing -> case maybeUnpackFunTy inst_ty of
- Just (arg, res) -> isTyVarTemplateTy arg && isTyVarTemplateTy res
- Nothing -> error "TcInstDecls:is_plain_instance"
--}
-\end{code}
-
-
-Checking for a decent instance type
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@scrutiniseInstanceType@ checks the type {\em and} its syntactic constraints:
it must normally look like: @instance Foo (Tycon a b c ...) ...@
We can also have instances for functions: @instance Foo (a -> b) ...@.
\begin{code}
-scrutiniseInstanceType dfun_name clas inst_tau
- -- TYCON CHECK
- | not (maybeToBool inst_tycon_maybe) || isSynTyCon inst_tycon
- = failTc (instTypeErr inst_tau)
-
- -- IMPORTED INSTANCES ARE OK (but see tcInstDecl1)
- | not (isLocallyDefined dfun_name)
- = returnTc (inst_tycon,arg_tys)
-
- -- TYVARS CHECK
- | not (opt_GlasgowExts ||
- (all isTyVarTy arg_tys && null tyvar_dups)
- )
- = failTc (instTypeErr inst_tau)
-
- -- DERIVING CHECK
- -- It is obviously illegal to have an explicit instance
- -- for something that we are also planning to `derive'
- -- Though we can have an explicit instance which is more
- -- specific than the derived instance
- | clas `elem` (derivedClasses inst_tycon)
- && all isTyVarTy arg_tys
- = failTc (derivingWhenInstanceExistsErr clas inst_tycon)
-
- | -- CCALL CHECK
+scrutiniseInstanceType clas inst_taus
+ | -- CCALL CHECK (a).... urgh!
-- To verify that a user declaration of a CCallable/CReturnable
-- instance is OK, we must be able to see the constructor(s)
-- of the instance type (see next guard.)
--
-- We flag this separately to give a more precise error msg.
--
- (uniqueOf clas == cCallableClassKey && not constructors_visible) ||
- (uniqueOf clas == cReturnableClassKey && not constructors_visible)
- = failTc (invisibleDataConPrimCCallErr clas inst_tau)
+ (uniqueOf clas == cCallableClassKey || uniqueOf clas == cReturnableClassKey)
+ && is_alg_tycon_app && not constructors_visible
+ = failWithTc (invisibleDataConPrimCCallErr clas first_inst_tau)
- | -- CCALL CHECK
+ | -- CCALL CHECK (b)
-- A user declaration of a CCallable/CReturnable instance
-- must be for a "boxed primitive" type.
- (uniqueOf clas == cCallableClassKey && not (ccallable_type inst_tau)) ||
- (uniqueOf clas == cReturnableClassKey && not (creturnable_type inst_tau))
- = failTc (nonBoxedPrimCCallErr clas inst_tau)
+ (uniqueOf clas == cCallableClassKey && not (ccallable_type first_inst_tau)) ||
+ (uniqueOf clas == cReturnableClassKey && not (creturnable_type first_inst_tau))
+ = failWithTc (nonBoxedPrimCCallErr clas first_inst_tau)
+
+ -- DERIVING CHECK
+ -- It is obviously illegal to have an explicit instance
+ -- for something that we are also planning to `derive'
+ | maybeToBool alg_tycon_app_maybe && clas `elem` (tyConDerivings alg_tycon)
+ = failWithTc (derivingWhenInstanceExistsErr clas first_inst_tau)
+ -- Kind check will have ensured inst_taus is of length 1
+
+ -- WITH HASKELL 1.4, MUST HAVE C (T a b c)
+ | not opt_GlasgowExts
+ && not (length inst_taus == 1 &&
+ maybeToBool maybe_tycon_app && -- Yes, there's a type constuctor
+ not (isSynTyCon tycon) && -- ...but not a synonym
+ all isTyVarTy arg_tys && -- Applied to type variables
+ length (tyVarSetToList (tyVarsOfTypes arg_tys)) == length arg_tys
+ -- This last condition checks that all the type variables are distinct
+ )
+ = failWithTc (instTypeErr clas inst_taus
+ (text "the instance type must be of form (T a b c)" $$
+ text "where T is not a synonym, and a,b,c are distinct type variables")
+ )
| otherwise
- = returnTc (inst_tycon,arg_tys)
+ = returnTc ()
where
- (possible_tycon, arg_tys) = splitAppTys inst_tau
- inst_tycon_maybe = getTyCon_maybe possible_tycon
- inst_tycon = expectJust "tcInstDecls1:inst_tycon" inst_tycon_maybe
- (_, tyvar_dups) = removeDups cmp (map (getTyVar "tcInstDecls1:getTyVarTy") arg_tys)
+ (first_inst_tau : _) = inst_taus
- constructors_visible =
- case maybeAppDataTyCon inst_tau of
- Just (_,_,[]) -> False
- everything_else -> True
+ -- Stuff for algebraic or -> type
+ maybe_tycon_app = splitTyConApp_maybe first_inst_tau
+ Just (tycon, arg_tys) = maybe_tycon_app
+
+ -- Stuff for an *algebraic* data type
+ alg_tycon_app_maybe = splitAlgTyConApp_maybe first_inst_tau
+ -- The "Alg" part looks through synonyms
+ is_alg_tycon_app = maybeToBool alg_tycon_app_maybe
+ Just (alg_tycon, _, data_cons) = alg_tycon_app_maybe
+
+ constructors_visible = not (null data_cons)
+
-- These conditions come directly from what the DsCCall is capable of.
-- Totally grotesque. Green card should solve this.
-ccallable_type ty = isPrimType ty || -- Allow CCallable Int# etc
+ccallable_type ty = isUnpointedType ty || -- Allow CCallable Int# etc
maybeToBool (maybeBoxedPrimType ty) || -- Ditto Int etc
- ty `eqTy` stringTy ||
+ ty == stringTy ||
byte_arr_thing
where
- byte_arr_thing = case maybeAppDataTyCon ty of
+ byte_arr_thing = case splitAlgTyConApp_maybe ty of
Just (tycon, ty_args, [data_con]) | isDataTyCon tycon ->
length data_con_arg_tys == 2 &&
maybeToBool maybe_arg2_tycon &&
where
data_con_arg_tys = dataConArgTys data_con ty_args
(data_con_arg_ty1 : data_con_arg_ty2 : _) = data_con_arg_tys
- maybe_arg2_tycon = maybeAppTyCon data_con_arg_ty2
+ maybe_arg2_tycon = splitTyConApp_maybe data_con_arg_ty2
Just (arg2_tycon,_) = maybe_arg2_tycon
other -> False
creturnable_type ty = maybeToBool (maybeBoxedPrimType ty) ||
-- Or, a data type with a single nullary constructor
- case (maybeAppDataTyCon ty) of
+ case (splitAlgTyConApp_maybe ty) of
Just (tycon, tys_applied, [data_con])
-> isNullaryDataCon data_con
other -> False
\begin{code}
-instTypeErr ty sty
- = case ty of
- SynTy tc _ _ -> hsep [ptext SLIT("The type synonym"), ppr sty tc, rest_of_msg]
- TyVarTy tv -> hsep [ptext SLIT("The type variable"), ppr sty tv, rest_of_msg]
- other -> sep [ptext SLIT("The type"), nest 4 (ppr sty ty), rest_of_msg]
- where
- rest_of_msg = ptext SLIT("cannot be used as an instance type")
+instTypeErr clas tys msg
+ = sep [ptext SLIT("Illegal instance declaration for") <+> quotes (pprConstraint clas tys),
+ nest 4 (parens msg)
+ ]
-derivingWhenInstanceExistsErr clas tycon sty
+derivingWhenInstanceExistsErr clas tycon
= hang (hsep [ptext SLIT("Deriving class"),
- ppr sty clas,
- ptext SLIT("type"), ppr sty tycon])
+ quotes (ppr clas),
+ ptext SLIT("type"), quotes (ppr tycon)])
4 (ptext SLIT("when an explicit instance exists"))
-nonBoxedPrimCCallErr clas inst_ty sty
+nonBoxedPrimCCallErr clas inst_ty
= hang (ptext SLIT("Unacceptable instance type for ccall-ish class"))
- 4 (hsep [ ptext SLIT("class"), ppr sty clas, ptext SLIT("type"),
- ppr sty inst_ty])
+ 4 (hsep [ ptext SLIT("class"), ppr clas, ptext SLIT("type"),
+ ppr inst_ty])
+
+omittedMethodWarn sel_id clas
+ = sep [ptext SLIT("No explicit method nor default method for") <+> quotes (ppr sel_id),
+ ptext SLIT("in an instance declaration for") <+> quotes (ppr clas)]
{-
Declaring CCallable & CReturnable instances in a module different
abstractly (either programmatically or by the renamer being over-eager
in its pruning.)
-}
-invisibleDataConPrimCCallErr clas inst_ty sty
- = hang (hsep [(ppr sty inst_ty <> ptext SLIT("s constructors not visible when checking")),
- ppr sty clas, ptext SLIT("instance")])
- 4 (hsep [ptext SLIT("(Try either importing"), ppr sty inst_ty,
- ptext SLIT("non-abstractly or compile using -fno-prune-tydecls ..)")])
-
-omittedMethodWarn sel_id clas sty
- = sep [ptext SLIT("Warning: no explicit method nor default method for") <+> ppr sty sel_id,
- ptext SLIT("in an instance declaration for") <+> ppr sty clas]
-
-instMethodNotInClassErr occ clas sty
- = hang (ptext SLIT("Instance mentions a method not in the class"))
- 4 (hsep [ptext SLIT("class"), ppr sty clas, ptext SLIT("method"),
- ppr sty occ])
-
-patMonoBindsCtxt pbind sty
- = hang (ptext SLIT("In a pattern binding:"))
- 4 (ppr sty pbind)
-
-methodSigCtxt name ty sty
- = hang (hsep [ptext SLIT("When matching the definition of class method"),
- ppr sty name, ptext SLIT("to its signature :") ])
- 4 (ppr sty ty)
-
-bindSigCtxt sty
- = ptext SLIT("When checking methods of an instance declaration")
-
-superClassSigCtxt sty
- = ptext SLIT("When checking superclass constraints of an instance declaration")
+invisibleDataConPrimCCallErr clas inst_ty
+ = hang (hsep [ptext SLIT("Constructors for"), quotes (ppr inst_ty),
+ ptext SLIT("not visible when checking"),
+ quotes (ppr clas), ptext SLIT("instance")])
+ 4 (hsep [text "(Try either importing", ppr inst_ty,
+ text "non-abstractly or compile using -fno-prune-tydecls ..)"])
+
+methodCtxt = ptext SLIT("When checking the methods of an instance declaration")
+superClassCtxt = ptext SLIT("When checking the superclasses of an instance declaration")
\end{code}
projects / ghc-hetmet.git / blobdiff