module TcInstDcls (
tcInstDecls1,
tcInstDecls2,
- processInstBinds
+ processInstBinds,
+ newMethodId
) where
-import Ubiq
+IMP_Ubiq()
import HsSyn ( InstDecl(..), FixityDecl, Sig(..),
SpecInstSig(..), HsBinds(..), Bind(..),
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,
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 ( zipEqual, panic )
let
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) ->
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
-> 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
let
tag = classOpTagByString clas occ
method_id = method_ids !! (tag-1)
+ method_ty = tcIdType method_id
in
- -- The "method" might be a RealId, when processInstBinds is used by
- -- TcClassDcls:buildDefaultMethodBinds to make default-method bindings
- (case method_id of
- TcId id -> returnNF_Tc (idType id)
- RealId id -> tcInstType [] (idType id)
- ) `thenNF_Tc` \ method_ty ->
+ tcInstTcType method_ty `thenNF_Tc` \ (method_tyvars, method_rho) ->
let
- (method_tyvars, method_theta, method_tau) = splitSigmaTy method_ty
+ (method_theta, method_tau) = splitRhoTy method_rho
in
newDicts origin method_theta `thenNF_Tc` \ (method_dicts,method_dict_ids) ->
-- 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
-- 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 opt_CompilingPrelude -- which allows anything
+ && not (maybeToBool (maybeBoxedPrimType inst_tau))
= failTc (nonBoxedPrimCCallErr clas inst_tau)
| otherwise
projects / ghc-hetmet.git / blobdiff