IMP_Ubiq()
-import HsSyn ( HsDecl(..), ClassDecl(..), HsBinds(..), Bind(..), MonoBinds(..),
+import HsSyn ( HsDecl(..), ClassDecl(..), HsBinds(..), MonoBinds(..),
Match(..), GRHSsAndBinds(..), GRHS(..), HsExpr(..),
DefaultDecl, TyDecl, InstDecl, IfaceSig, Fixity,
HsLit(..), OutPat(..), Sig(..), HsType(..), HsTyVar,
+ SYN_IE(RecFlag), nonRecursive, andMonoBinds,
Stmt, DoOrListComp, ArithSeqInfo, InPat, Fake )
import HsTypes ( getTyVarName )
import HsPragmas ( ClassPragmas(..) )
import Inst ( Inst, InstOrigin(..), SYN_IE(LIE), emptyLIE, plusLIE, newDicts, newMethod )
import TcEnv ( tcLookupClass, tcLookupTyVar, tcLookupTyCon, newLocalIds, tcAddImportedIdInfo,
tcExtendGlobalTyVars )
-import TcInstDcls ( processInstBinds )
+import TcInstDcls ( tcMethodBind )
import TcKind ( unifyKind, TcKind )
import TcMonad
import TcMonoType ( tcHsType, tcContext )
import Bag ( foldBag, unionManyBags )
import Class ( GenClass, GenClassOp, mkClass, mkClassOp, classBigSig,
- classOps, classOpString, classOpLocalType,
- classOpTagByOccName, SYN_IE(ClassOp)
+ classOps, classOpString, classOpLocalType, classDefaultMethodId,
+ classOpTagByOccName, SYN_IE(ClassOp), SYN_IE(Class)
+ )
+import Id ( GenId, mkSuperDictSelId, mkMethodSelId,
+ mkDefaultMethodId, getIdUnfolding,
+ idType, SYN_IE(Id)
)
-import Id ( GenId, mkSuperDictSelId, mkMethodSelId, mkDefaultMethodId, getIdUnfolding,
- idType )
import CoreUnfold ( getUnfoldingTemplate )
import IdInfo
-import Name ( Name, isLocallyDefined, moduleString, modAndOcc, nameString )
+import Name ( Name, isLocallyDefined, moduleString,
+ modAndOcc, nameString, NamedThing(..) )
+import Outputable
import PrelVals ( nO_DEFAULT_METHOD_ERROR_ID )
import PprStyle
import Pretty
-import PprType ( GenType, GenTyVar, GenClassOp )
+import PprType ( GenClass, GenType, GenTyVar, GenClassOp )
import SpecEnv ( SpecEnv )
import SrcLoc ( mkGeneratedSrcLoc )
import Type ( mkFunTy, mkTyVarTy, mkTyVarTys, mkDictTy,
- mkForAllTy, mkSigmaTy, splitSigmaTy)
+ mkForAllTy, mkSigmaTy, splitSigmaTy, SYN_IE(Type)
+ )
import TysWiredIn ( stringTy )
-import TyVar ( unitTyVarSet, GenTyVar )
-import Unique ( Unique )
+import TyVar ( unitTyVarSet, GenTyVar, SYN_IE(TyVar) )
+import Unique ( Unique )
+import UniqFM ( Uniquable(..) )
import Util
= classBigSig clas
-- The selector binds are already in the selector Id's unfoldings
- sel_binds = SingleBind $ NonRecBind $ foldr AndMonoBinds EmptyMonoBinds $
- [ CoreMonoBind (RealId sel_id) (getUnfoldingTemplate (getIdUnfolding sel_id))
+ sel_binds = [ CoreMonoBind (RealId sel_id) (getUnfoldingTemplate (getIdUnfolding sel_id))
| sel_id <- sc_sel_ids ++ op_sel_ids,
isLocallyDefined sel_id
]
+
+ final_sel_binds = MonoBind (andMonoBinds sel_binds) [] nonRecursive
in
-- Generate bindings for the default methods
tcInstSigTyVars [tyvar] `thenNF_Tc` \ ([clas_tyvar], _, _) ->
- buildDefaultMethodBinds clas clas_tyvar defm_ids default_binds
- `thenTc` \ (const_insts, meth_binds) ->
+ mapAndUnzipTc (buildDefaultMethodBind clas clas_tyvar default_binds)
+ (op_sel_ids `zip` [0..])
+ `thenTc` \ (const_insts_s, meth_binds) ->
- returnTc (const_insts, sel_binds `ThenBinds` meth_binds)
+ returnTc (unionManyBags const_insts_s,
+ final_sel_binds `ThenBinds`
+ MonoBind (andMonoBinds meth_binds) [] nonRecursive)
\end{code}
%************************************************************************
\end{verbatim}
\begin{code}
-buildDefaultMethodBinds
+buildDefaultMethodBind
:: Class
-> TcTyVar s
- -> [Id]
-> RenamedMonoBinds
- -> TcM s (LIE s, TcHsBinds s)
+ -> (Id, Int)
+ -> TcM s (LIE s, TcMonoBinds s)
-buildDefaultMethodBinds clas clas_tyvar
- default_method_ids default_binds
+buildDefaultMethodBind clas clas_tyvar default_binds (sel_id, idx)
= newDicts origin [(clas,inst_ty)] `thenNF_Tc` \ (this_dict, [this_dict_id]) ->
- mapAndUnzipNF_Tc mk_method default_method_ids `thenNF_Tc` \ (insts_s, local_defm_ids) ->
let
- avail_insts = this_dict `plusLIE` unionManyBags insts_s -- Insts available
- clas_tyvar_set = unitTyVarSet clas_tyvar
+ avail_insts = this_dict
+ defm_id = classDefaultMethodId clas idx
in
tcExtendGlobalTyVars clas_tyvar_set (
- processInstBinds
- clas
- (makeClassDeclDefaultMethodRhs clas local_defm_ids)
- avail_insts
- local_defm_ids
- default_binds
- ) `thenTc` \ (insts_needed, default_binds') ->
-
- tcSimplifyAndCheck
- clas_tyvar_set
- avail_insts
- insts_needed `thenTc` \ (const_lie, dict_binds) ->
-
-
- let
- defm_binds = AbsBinds
- [clas_tyvar]
- [this_dict_id]
- (local_defm_ids `zip` map RealId default_method_ids)
- dict_binds
- (RecBind default_binds')
- in
- returnTc (const_lie, defm_binds)
- where
- inst_ty = mkTyVarTy clas_tyvar
- mk_method defm_id = newMethod origin (RealId defm_id) [inst_ty]
- origin = ClassDeclOrigin
-\end{code}
-
-====================
-buildDefaultMethodBinds
- :: Class
- -> TcTyVar s
- -> [Id]
- -> RenamedMonoBinds
- -> TcM s (LIE s, TcHsBinds s)
-
-buildDefaultMethodBinds clas clas_tyvar
- default_method_ids default_binds
- = newDicts origin [(clas,inst_ty)] `thenNF_Tc` \ (this_dict, [this_dict_id]) ->
- tcExtendGlobalTyVars clas_tyvar_set (
- tcDefaultMethodBinds default_binds
- )
-
-tcDefaultMethodBinds default_meth_ids default_binds
- where
- go (AndMonoBinds b1 b2)
- = go b1 `thenTc` \ (new_b1, lie1) ->
- go b2 `thenTc` \ (new_b2, lie2) ->
- returnTc (new_b1 `ThenBinds` new_b2, lie1 `plusLIE` lie2)
-
- go EmptyMonoBinds = EmptyBinds
-
- go mbind = processInstBinds1 clas clas_dict meth_ids mbind `thenTc` \ (tags
-
-tcDefaultMethodBinds EmptyMonoBinds
-
-
-
- processInstBinds
- clas
- (makeClassDeclDefaultMethodRhs clas local_defm_ids)
- avail_insts
- local_defm_ids
- default_binds
- ) `thenTc` \ (insts_needed, default_binds') ->
-
- let
- mapAndUnzipNF_Tc mk_method default_method_ids `thenNF_Tc` \ (insts_s, local_defm_ids) ->
- let
- avail_insts = this_dict `plusLIE` unionManyBags insts_s -- Insts available
- clas_tyvar_set = unitTyVarSet clas_tyvar
- in
+ tcMethodBind noDefmExpr inst_ty default_binds (sel_id, idx)
+ ) `thenTc` \ (defm_bind, insts_needed, (_, local_defm_id)) ->
+ -- CHECK THE CONTEXT OF THE DEFAULT-METHOD BINDS
tcSimplifyAndCheck
clas_tyvar_set
avail_insts
insts_needed `thenTc` \ (const_lie, dict_binds) ->
-
let
defm_binds = AbsBinds
[clas_tyvar]
[this_dict_id]
- (local_defm_ids `zip` map RealId default_method_ids)
- dict_binds
- (RecBind default_binds')
+ [([clas_tyvar], RealId defm_id, local_defm_id)]
+ (dict_binds `AndMonoBinds` defm_bind)
in
returnTc (const_lie, defm_binds)
- where
- inst_ty = mkTyVarTy clas_tyvar
- mk_method defm_id = newMethod origin (RealId defm_id) [inst_ty]
- origin = ClassDeclOrigin
-==================
-
-@makeClassDeclDefaultMethodRhs@ builds the default method for a
-class declaration when no explicit default method is given.
-
-\begin{code}
-makeClassDeclDefaultMethodRhs
- :: Class
- -> [TcIdOcc s]
- -> Int
- -> NF_TcM s (TcExpr s)
-
-makeClassDeclDefaultMethodRhs clas method_ids tag
- = -- Return the expression
- -- error ty "No default method for ..."
- -- The interesting thing is that method_ty is a for-all type;
- -- this is fun, although unusual in a type application!
-
- returnNF_Tc (HsApp (mkHsTyApp (HsVar (RealId nO_DEFAULT_METHOD_ERROR_ID)) [tcIdType method_id])
- (HsLitOut (HsString (_PK_ error_msg)) stringTy))
where
- (clas_mod, clas_name) = modAndOcc clas
-
- method_id = method_ids !! (tag-1)
- class_op = (classOps clas) !! (tag-1)
-
- error_msg = _UNPK_ (nameString (getName clas))
- ++ (ppShow 80 (ppr PprForUser class_op))
--- ++ "\"" Don't know what this trailing quote is for!
+ clas_tyvar_set = unitTyVarSet clas_tyvar
+ inst_ty = mkTyVarTy clas_tyvar
+ origin = ClassDeclOrigin
+ noDefmExpr _ = HsApp (HsVar (getName nO_DEFAULT_METHOD_ERROR_ID))
+ (HsLit (HsString (_PK_ error_msg)))
+
+ error_msg = show (sep [text "Class", ppr PprForUser clas,
+ text "Method", ppr PprForUser sel_id])
\end{code}
+
Contexts
~~~~~~~~
\begin{code}
classDeclCtxt class_name sty
- = ppCat [ppPStr SLIT("In the class declaration for"), ppr sty class_name]
+ = hsep [ptext SLIT("In the class declaration for"), ppr sty class_name]
\end{code}
projects / ghc-hetmet.git / blobdiff