module TcInstDcls (
tcInstDecls1,
tcInstDecls2,
- processInstBinds
+ processInstBinds,
+ newMethodId
) where
-import Ubiq
+IMP_Ubiq()
import HsSyn ( InstDecl(..), FixityDecl, Sig(..),
SpecInstSig(..), HsBinds(..), Bind(..),
MonoBinds(..), GRHSsAndBinds, Match,
InPat(..), OutPat(..), HsExpr(..), HsLit(..),
- Stmt, Qual, ArithSeqInfo, Fake,
+ Stmt, Qualifier, ArithSeqInfo, Fake,
PolyType(..), MonoType )
import RnHsSyn ( RenamedHsBinds(..), RenamedMonoBinds(..),
RenamedInstDecl(..), RenamedFixityDecl(..),
import TcMonad hiding ( rnMtoTcM )
-import GenSpecEtc ( checkSigTyVars )
+import GenSpecEtc ( checkSigTyVarsGivenGlobals )
import Inst ( Inst, InstOrigin(..), InstanceMapper(..),
newDicts, newMethod, LIE(..), emptyLIE, plusLIE )
import TcBinds ( tcPragmaSigs )
import TcKind ( TcKind, unifyKind )
import TcMatches ( tcMatchesFun )
import TcMonoType ( tcContext, tcMonoTypeKind )
-import TcSimplify ( tcSimplifyAndCheck, tcSimplifyThetas )
+import TcSimplify ( tcSimplifyAndCheck )
import TcType ( TcType(..), TcTyVar(..),
- tcInstSigTyVars, tcInstType, tcInstTheta
+ tcInstSigTyVars, tcInstType, tcInstTheta, tcInstTcType
)
-import Unify ( unifyTauTy )
+import Unify ( unifyTauTy, unifyTauTyLists )
import Bag ( emptyBag, unitBag, unionBags, unionManyBags,
concatBag, foldBag, bagToList )
-import CmdLineOpts ( opt_GlasgowExts, opt_CompilingPrelude,
+import CmdLineOpts ( opt_GlasgowExts,
opt_OmitDefaultInstanceMethods,
- opt_SpecialiseOverloaded )
+ opt_SpecialiseOverloaded
+ )
import Class ( GenClass, GenClassOp,
isCcallishClass, classBigSig,
classOps, classOpLocalType,
import TyCon ( isSynTyCon, derivedFor )
import Type ( GenType(..), ThetaType(..), mkTyVarTys,
splitSigmaTy, splitAppTy, isTyVarTy, matchTy, mkSigmaTy,
- getTyCon_maybe, maybeBoxedPrimType
+ getTyCon_maybe, maybeBoxedPrimType, splitRhoTy
)
-import TyVar ( GenTyVar, mkTyVarSet )
+import TyVar ( GenTyVar, mkTyVarSet, unionTyVarSets )
import TysWiredIn ( stringTy )
import Unique ( Unique )
-import Util ( panic )
+import Util ( zipEqual, panic )
\end{code}
Typechecking instance declarations is done in two passes. The first
if (not from_here && (clas `derivedFor` inst_tycon)
&& all isTyVarTy arg_tys)
then
- if not opt_CompilingPrelude && maybeToBool inst_mod &&
- mod_name == expectJust "inst_mod" inst_mod
+ if mod_name == inst_mod
then
-- Imported instance came from this module;
-- discard and derive fresh instance
else
-- Make the dfun id and constant-method ids
- mkInstanceRelatedIds from_here inst_mod pragmas
+ mkInstanceRelatedIds from_here src_loc inst_mod pragmas
clas inst_tyvars inst_tau inst_theta uprags
`thenTc` \ (dfun_id, dfun_theta, const_meth_ids) ->
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')
+ sc_theta' = super_classes `zip` repeat inst_ty'
origin = InstanceDeclOrigin
- mk_method sel_id = newMethodId sel_id inst_ty' origin locn
+ mk_method sel_id = newMethodId sel_id inst_ty' origin
in
-- Create dictionary Ids from the specified instance contexts.
newDicts origin sc_theta' `thenNF_Tc` \ (sc_dicts, sc_dict_ids) ->
inst_tyvars'
dfun_arg_dicts_ids
((this_dict_id, RealId dfun_id)
- : (meth_ids `zip` (map RealId const_meth_ids)))
- -- const_meth_ids will often be empty
+ : (meth_ids `zip` map RealId const_meth_ids))
+ -- NB: const_meth_ids will often be empty
super_binds
(RecBind dict_and_method_binds)
returnTc (const_lie `plusLIE` spec_lie, inst_binds)
\end{code}
+============= OLD ================
+
@mkMethodId@ manufactures an id for a local method.
It's rather turgid stuff, because there are two cases:
So for these we just make a local (non-Inst) id with a suitable type.
How disgusting.
+=============== END OF OLD ===================
\begin{code}
-newMethodId sel_id inst_ty origin loc
- = let (sel_tyvars,sel_theta,sel_tau) = splitSigmaTy (idType sel_id)
+newMethodId sel_id inst_ty origin
+ = newMethod origin (RealId sel_id) [inst_ty]
+
+
+{- REMOVE SOON: (this was pre-split-poly selector types)
+let (sel_tyvars,sel_theta,sel_tau) = splitSigmaTy (idType sel_id)
(_:meth_theta) = sel_theta -- The local theta is all except the
-- first element of the context
in
`thenNF_Tc` \ method_ty ->
newLocalId (getLocalName sel_id) method_ty `thenNF_Tc` \ meth_id ->
returnNF_Tc (emptyLIE, meth_id)
+-}
\end{code}
The next function makes a default method which calls the global default method, at
-> NF_TcM s (TcExpr s)
makeInstanceDeclDefaultMethodExpr origin meth_ids defm_ids inst_ty this_dict tag
- = newDicts origin op_theta `thenNF_Tc` \ (op_lie,op_dicts) ->
-
- -- def_op_id = /\ op_tyvars -> \ op_dicts ->
- -- defm_id inst_ty op_tyvars this_dict op_dicts
- returnNF_Tc (
- mkHsTyLam op_tyvars (
- mkHsDictLam op_dicts (
- mkHsDictApp (mkHsTyApp (HsVar (RealId defm_id))
- (inst_ty : mkTyVarTys op_tyvars))
- (this_dict : op_dicts)
- )))
+ =
+ -- def_op_id = defm_id inst_ty this_dict
+ returnNF_Tc (mkHsDictApp (mkHsTyApp (HsVar (RealId defm_id)) [inst_ty]) [this_dict])
where
idx = tag - 1
meth_id = meth_ids !! idx
defm_id = defm_ids !! idx
- (op_tyvars, op_theta, op_tau) = splitSigmaTy (tcIdType meth_id)
makeInstanceDeclNoDefaultExpr
:: InstOrigin s
-> [Id]
-> TcType s
-> Class
- -> Maybe Module
+ -> Module
-> Int
-> NF_TcM s (TcExpr s)
makeInstanceDeclNoDefaultExpr origin meth_ids defm_ids inst_ty clas inst_mod tag
- = newDicts origin op_theta `thenNF_Tc` \ (op_lie, op_dicts) ->
-
+ =
-- Produce a warning if the default instance method
-- has been omitted when one exists in the class
warnTc (not err_defm_ok)
(omitDefaultMethodWarn clas_op clas_name inst_ty)
`thenNF_Tc_`
- returnNF_Tc (mkHsTyLam op_tyvars (
- mkHsDictLam op_dicts (
- HsApp (mkHsTyApp (HsVar (RealId nO_EXPLICIT_METHOD_ERROR_ID)) [op_tau])
- (HsLitOut (HsString (_PK_ error_msg)) stringTy))))
+ returnNF_Tc (HsApp (mkHsTyApp (HsVar (RealId nO_EXPLICIT_METHOD_ERROR_ID)) [tcIdType meth_id])
+ (HsLitOut (HsString (_PK_ error_msg)) stringTy))
where
idx = tag - 1
meth_id = meth_ids !! idx
clas_op = (classOps clas) !! idx
defm_id = defm_ids !! idx
- (op_tyvars,op_theta,op_tau) = splitSigmaTy (tcIdType meth_id)
Just (_, _, err_defm_ok) = isDefaultMethodId_maybe defm_id
- mod_str = case inst_mod of { Nothing -> pRELUDE; Just m -> m }
-
- error_msg = _UNPK_ mod_str ++ "." ++ _UNPK_ clas_name ++ "."
+ error_msg = _UNPK_ inst_mod ++ "." ++ _UNPK_ clas_name ++ "."
++ (ppShow 80 (ppr PprForUser inst_ty)) ++ "."
++ (ppShow 80 (ppr PprForUser clas_op)) ++ "\""
- clas_name = nameOf (origName clas)
+ clas_name = nameOf (origName "makeInstanceDeclNoDefaultExpr" clas)
\end{code}
let
tag = classOpTagByString clas occ
method_id = method_ids !! (tag-1)
-
method_ty = tcIdType method_id
- (method_tyvars, method_theta, method_tau) = splitSigmaTy method_ty
in
- newDicts origin method_theta `thenNF_Tc` \ (method_dicts,method_dict_ids) ->
+
+ tcInstTcType method_ty `thenNF_Tc` \ (method_tyvars, method_rho) ->
+ let
+ (method_theta, method_tau) = splitRhoTy method_rho
+ in
+ newDicts origin method_theta `thenNF_Tc` \ (method_dicts,method_dict_ids) ->
case (method_tyvars, method_dict_ids) of
-- The latter is needed just so we can return an AbsBinds wrapped
-- up inside a MonoBinds.
+
+ -- Make the method_tyvars into signature tyvars so they
+ -- won't get unified with anything.
+ tcInstSigTyVars method_tyvars `thenNF_Tc` \ (sig_tyvars, sig_tyvar_tys, _) ->
+ unifyTauTyLists (mkTyVarTys method_tyvars) sig_tyvar_tys `thenTc_`
+
newLocalId occ method_tau `thenNF_Tc` \ local_id ->
newLocalId occ method_ty `thenNF_Tc` \ copy_id ->
let
- inst_method_tyvars = inst_tyvars ++ method_tyvars
+ inst_tyvar_set = mkTyVarSet inst_tyvars
+ inst_method_tyvar_set = inst_tyvar_set `unionTyVarSets` (mkTyVarSet sig_tyvars)
in
-- Typecheck the method
tcMethodBind local_id method_tau mbind `thenTc` \ (mbind', lieIop) ->
-- Here we must simplify constraints on "a" to catch all
-- the Bar-ish things.
tcAddErrCtxt (methodSigCtxt op method_ty) (
+ checkSigTyVarsGivenGlobals
+ inst_tyvar_set
+ sig_tyvars method_tau `thenTc_`
+
tcSimplifyAndCheck
- (mkTyVarSet inst_method_tyvars)
+ inst_method_tyvar_set
(method_dicts `plusLIE` avail_insts)
lieIop
) `thenTc` \ (f_dicts, dict_binds) ->
+
returnTc ([tag],
f_dicts,
VarMonoBind method_id
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 = inst_tv_tys `zipEqual` inst_tmpl_tys
+ tv_tmpl_map = zipEqual "tcSpecInstSig" inst_tv_tys inst_tmpl_tys
tv_to_tmpl tv = assoc "tcSpecInstSig" tv_tmpl_map tv
in
- mkInstanceRelatedIds e True{-from here-} mod NoInstancePragmas src_loc
+ mkInstanceRelatedIds e True{-from here-} src_loc mod NoInstancePragmas
clas inst_tmpls inst_ty simpl_theta uprag
`thenTc` \ (dfun_id, dfun_theta, const_meth_ids) ->
-- A user declaration of a CCallable/CReturnable instance
-- must be for a "boxed primitive" type.
isCcallishClass clas
- && not opt_CompilingPrelude -- which allows anything
- && maybeToBool (maybeBoxedPrimType inst_tau)
+ && not (maybeToBool (maybeBoxedPrimType inst_tau))
= failTc (nonBoxedPrimCCallErr clas inst_tau)
| otherwise
= ppHang (ppBesides [ppStr "Deriving class `", ppr sty clas, ppStr "' type `", ppr sty tycon, ppStr "'"])
4 (ppBesides [ppStr "when an instance declared in module `", pp_mod, ppStr "' has been imported"])
where
- pp_mod = case inst_mod of
- Nothing -> ppPStr SLIT("the standard Prelude")
- Just m -> ppBesides [ppStr "module `", ppPStr m, ppStr "'"]
+ pp_mod = ppBesides [ppStr "module `", ppPStr inst_mod, ppStr "'"]
nonBoxedPrimCCallErr clas inst_ty sty
= ppHang (ppStr "Instance isn't for a `boxed-primitive' type")
projects / ghc-hetmet.git / blobdiff