#include "HsVersions.h"
-import HsSyn ( InstDecl(..), HsType(..),
- MonoBinds(..), HsExpr(..), HsLit(..), Sig(..),
- andMonoBindList, collectMonoBinders,
- isClassDecl
- )
-import RnHsSyn ( RenamedHsBinds, RenamedInstDecl, RenamedTyClDecl )
-import TcHsSyn ( TcMonoBinds, mkHsConApp )
+import HsSyn
import TcBinds ( tcSpecSigs )
import TcClassDcl ( tcMethodBind, mkMethodBind, badMethodErr,
tcClassDecl2, getGenericInstances )
import TcRnMonad
-import TcMType ( tcInstType, checkValidTheta, checkValidInstHead, instTypeErr,
+import TcMType ( tcSkolType, checkValidTheta, checkValidInstHead, instTypeErr,
checkAmbiguity, SourceTyCtxt(..) )
-import TcType ( mkClassPred, tcSplitForAllTys, tyVarsOfType,
+import TcType ( mkClassPred, tcSplitForAllTys, tyVarsOfType,
tcSplitSigmaTy, getClassPredTys, tcSplitPredTy_maybe, mkTyVarTys,
- TyVarDetails(..), tcSplitDFunTy
- )
-import Inst ( InstOrigin(..), tcInstClassOp, newDicts, instToId,
- showLIE, tcExtendLocalInstEnv )
+ SkolemInfo(InstSkol), tcSplitDFunTy, pprClassPred )
+import Inst ( tcInstClassOp, newDicts, instToId, showLIE, tcExtendLocalInstEnv )
import TcDeriv ( tcDeriving )
import TcEnv ( tcExtendGlobalValEnv, tcExtendTyVarEnv2,
InstInfo(..), InstBindings(..),
- newDFunName, tcExtendLocalValEnv
+ newDFunName, tcExtendIdEnv
)
-import PprType ( pprClassPred )
import TcHsType ( kcHsSigType, tcHsKindedType )
import TcUnify ( checkSigTyVars )
import TcSimplify ( tcSimplifyCheck, tcSimplifyTop )
-import Subst ( mkTyVarSubst, substTheta, substTy )
+import Type ( zipTvSubst, substTheta, substTys )
import DataCon ( classDataCon )
import Class ( classBigSig )
-import Var ( idName, idType )
-import NameSet
+import Var ( Id, idName, idType )
import MkId ( mkDictFunId, rUNTIME_ERROR_ID )
import FunDeps ( checkInstFDs )
-import Name ( getSrcLoc )
-import NameSet ( unitNameSet, emptyNameSet, nameSetToList )
+import Name ( Name, getSrcLoc )
+import NameSet ( unitNameSet, emptyNameSet, unionNameSets )
import UnicodeUtil ( stringToUtf8 )
import Maybe ( catMaybes )
+import SrcLoc ( srcLocSpan, unLoc, noLoc, Located(..), srcSpanStart )
import ListSetOps ( minusList )
import Outputable
+import Bag
import FastString
\end{code}
\begin{code}
tcInstDecls1 -- Deal with both source-code and imported instance decls
- :: [RenamedTyClDecl] -- For deriving stuff
- -> [RenamedInstDecl] -- Source code instance decls
+ :: [LTyClDecl Name] -- For deriving stuff
+ -> [LInstDecl Name] -- Source code instance decls
-> TcM (TcGblEnv, -- The full inst env
[InstInfo], -- Source-code instance decls to process;
-- contains all dfuns for this module
- RenamedHsBinds) -- Supporting bindings for derived instances
+ [HsBindGroup Name]) -- Supporting bindings for derived instances
tcInstDecls1 tycl_decls inst_decls
= checkNoErrs $
let
local_inst_info = catMaybes local_inst_infos
- clas_decls = filter isClassDecl tycl_decls
+ clas_decls = filter (isClassDecl.unLoc) tycl_decls
in
-- (2) Instances from generic class declarations
getGenericInstances clas_decls `thenM` \ generic_inst_info ->
-- Next, construct the instance environment so far, consisting of
- -- a) imported instance decls (from this module)
- -- b) local instance decls
- -- c) generic instances
+ -- a) local instance decls
+ -- b) generic instances
addInsts local_inst_info $
addInsts generic_inst_info $
-- (3) Compute instances from "deriving" clauses;
-- This stuff computes a context for the derived instance decl, so it
-- needs to know about all the instances possible; hence inst_env4
- tcDeriving tycl_decls `thenM` \ (deriv_inst_info, deriv_binds) ->
+ tcDeriving tycl_decls `thenM` \ (deriv_inst_info, deriv_binds, keep_alive) ->
addInsts deriv_inst_info $
getGblEnv `thenM` \ gbl_env ->
- returnM (gbl_env,
+ returnM (gbl_env { tcg_keep = tcg_keep gbl_env `unionNameSets` keep_alive },
generic_inst_info ++ deriv_inst_info ++ local_inst_info,
deriv_binds)
\end{code}
\begin{code}
-tcLocalInstDecl1 :: RenamedInstDecl
+tcLocalInstDecl1 :: LInstDecl Name
-> TcM (Maybe InstInfo) -- Nothing if there was an error
-- A source-file instance declaration
-- Type-check all the stuff before the "where"
-- Imported ones should have been checked already, and may indeed
-- contain something illegal in normal Haskell, notably
-- instance CCallable [Char]
-tcLocalInstDecl1 decl@(InstDecl poly_ty binds uprags src_loc)
+tcLocalInstDecl1 decl@(L loc (InstDecl poly_ty binds uprags))
= -- Prime error recovery, set source location
recoverM (returnM Nothing) $
- addSrcLoc src_loc $
+ setSrcSpan loc $
addErrCtxt (instDeclCtxt1 poly_ty) $
-- Typecheck the instance type itself. We can't use
checkValidInstHead tau `thenM` \ (clas,inst_tys) ->
checkTc (checkInstFDs theta clas inst_tys)
(instTypeErr (pprClassPred clas inst_tys) msg) `thenM_`
- newDFunName clas inst_tys src_loc `thenM` \ dfun_name ->
+ newDFunName clas inst_tys (srcSpanStart loc) `thenM` \ dfun_name ->
returnM (Just (InstInfo { iDFunId = mkDictFunId dfun_name tyvars theta clas inst_tys,
iBinds = VanillaInst binds uprags }))
where
%************************************************************************
\begin{code}
-tcInstDecls2 :: [RenamedTyClDecl] -> [InstInfo]
- -> TcM (TcLclEnv, TcMonoBinds)
+tcInstDecls2 :: [LTyClDecl Name] -> [InstInfo]
+ -> TcM (TcLclEnv, LHsBinds Id)
-- (a) From each class declaration,
-- generate any default-method bindings
-- (b) From each instance decl
tcInstDecls2 tycl_decls inst_decls
= do { -- (a) Default methods from class decls
(dm_binds_s, dm_ids_s) <- mapAndUnzipM tcClassDecl2 $
- filter isClassDecl tycl_decls
- ; tcExtendLocalValEnv (concat dm_ids_s) $ do
+ filter (isClassDecl.unLoc) tycl_decls
+ ; tcExtendIdEnv (concat dm_ids_s) $ do
-- (b) instance declarations
; inst_binds_s <- mappM tcInstDecl2 inst_decls
-- Done
; tcl_env <- getLclEnv
- ; returnM (tcl_env, andMonoBindList dm_binds_s `AndMonoBinds`
- andMonoBindList inst_binds_s) }
+ ; returnM (tcl_env, unionManyBags dm_binds_s `unionBags`
+ unionManyBags inst_binds_s) }
\end{code}
======= New documentation starts here (Sept 92) ==============
\begin{code}
-tcInstDecl2 :: InstInfo -> TcM TcMonoBinds
+tcInstDecl2 :: InstInfo -> TcM (LHsBinds Id)
tcInstDecl2 (InstInfo { iDFunId = dfun_id, iBinds = binds })
= -- Prime error recovery
- recoverM (returnM EmptyMonoBinds) $
- addSrcLoc (getSrcLoc dfun_id) $
+ recoverM (returnM emptyLHsBinds) $
+ setSrcSpan (srcLocSpan (getSrcLoc dfun_id)) $
addErrCtxt (instDeclCtxt2 (idType dfun_id)) $
let
+ rigid_info = InstSkol dfun_id
inst_ty = idType dfun_id
(inst_tyvars, _) = tcSplitForAllTys inst_ty
-- The tyvars of the instance decl scope over the 'where' part
in
-- Instantiate the instance decl with tc-style type variables
- tcInstType InstTv inst_ty `thenM` \ (inst_tyvars', dfun_theta', inst_head') ->
+ tcSkolType rigid_info inst_ty `thenM` \ (inst_tyvars', dfun_theta', inst_head') ->
let
Just pred = tcSplitPredTy_maybe inst_head'
(clas, inst_tys') = getClassPredTys pred
(class_tyvars, sc_theta, _, op_items) = classBigSig clas
-- Instantiate the super-class context with inst_tys
- sc_theta' = substTheta (mkTyVarSubst class_tyvars inst_tys') sc_theta
- origin = InstanceDeclOrigin
+ sc_theta' = substTheta (zipTvSubst class_tyvars inst_tys') sc_theta
+ origin = SigOrigin rigid_info
in
-- Create dictionary Ids from the specified instance contexts.
- newDicts origin sc_theta' `thenM` \ sc_dicts ->
+ newDicts InstScOrigin sc_theta' `thenM` \ sc_dicts ->
newDicts origin dfun_theta' `thenM` \ dfun_arg_dicts ->
newDicts origin [pred] `thenM` \ [this_dict] ->
-- Default-method Ids may be mentioned in synthesised RHSs,
let -- These insts are in scope; quite a few, eh?
avail_insts = [this_dict] ++ dfun_arg_dicts ++ sc_dicts
in
- tcMethods clas inst_tyvars inst_tyvars'
+ tcMethods origin clas inst_tyvars inst_tyvars'
dfun_theta' inst_tys' avail_insts
op_items binds `thenM` \ (meth_ids, meth_binds) ->
-- Figure out bindings for the superclass context
tcSuperClasses inst_tyvars' dfun_arg_dicts sc_dicts
- `thenM` \ (zonked_inst_tyvars, sc_binds_inner, sc_binds_outer) ->
+ `thenM` \ (sc_binds_inner, sc_binds_outer) ->
+
+ -- It's possible that the superclass stuff might have done unification
+ checkSigTyVars inst_tyvars' `thenM_`
-- Deal with 'SPECIALISE instance' pragmas by making them
-- look like SPECIALISE pragmas for the dfun
uprags = case binds of
VanillaInst _ uprags -> uprags
other -> []
- spec_prags = [ SpecSig (idName dfun_id) ty loc
- | SpecInstSig ty loc <- uprags ]
+ spec_prags = [ L loc (SpecSig (L loc (idName dfun_id)) ty)
+ | L loc (SpecInstSig ty) <- uprags ]
xtve = inst_tyvars `zip` inst_tyvars'
in
tcExtendGlobalValEnv [dfun_id] (
-- 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 rUNTIME_ERROR_ID) [idType this_dict_id])
- (HsLit (HsStringPrim (mkFastString (stringToUtf8 msg))))
+ nlHsApp (noLoc $ TyApp (nlHsVar rUNTIME_ERROR_ID)
+ [idType this_dict_id])
+ (nlHsLit (HsStringPrim (mkFastString (stringToUtf8 msg))))
| otherwise -- The common case
= mkHsConApp dict_constr inst_tys' (map HsVar scs_and_meths)
where
msg = "Compiler error: bad dictionary " ++ showSDoc (ppr clas)
- dict_bind = VarMonoBind this_dict_id dict_rhs
- all_binds = sc_binds_inner `AndMonoBinds` meth_binds `AndMonoBinds` dict_bind
+ dict_bind = noLoc (VarBind this_dict_id dict_rhs)
+ all_binds = dict_bind `consBag` (sc_binds_inner `unionBags` meth_binds)
- main_bind = AbsBinds
- zonked_inst_tyvars
- (map instToId dfun_arg_dicts)
- [(inst_tyvars', dfun_id, this_dict_id)]
- inlines all_binds
+ main_bind = noLoc $ AbsBinds
+ inst_tyvars'
+ (map instToId dfun_arg_dicts)
+ [(inst_tyvars', dfun_id, this_dict_id)]
+ inlines all_binds
in
showLIE (text "instance") `thenM_`
- returnM (main_bind `AndMonoBinds` prag_binds `AndMonoBinds` sc_binds_outer)
+ returnM (unitBag main_bind `unionBags`
+ prag_binds `unionBags`
+ sc_binds_outer)
-tcMethods clas inst_tyvars inst_tyvars' dfun_theta' inst_tys'
+tcMethods origin clas inst_tyvars inst_tyvars' dfun_theta' inst_tys'
avail_insts op_items (VanillaInst monobinds uprags)
= -- Check that all the method bindings come from this class
let
sel_names = [idName sel_id | (sel_id, _) <- op_items]
- bad_bndrs = collectMonoBinders monobinds `minusList` sel_names
+ bad_bndrs = collectHsBindBinders monobinds `minusList` sel_names
in
mappM (addErrTc . badMethodErr clas) bad_bndrs `thenM_`
-- Make the method bindings
let
- mk_method_bind = mkMethodBind InstanceDeclOrigin clas inst_tys' monobinds
+ mk_method_bind = mkMethodBind origin clas inst_tys' monobinds
in
mapAndUnzipM mk_method_bind op_items `thenM` \ (meth_insts, meth_infos) ->
all_insts = avail_insts ++ catMaybes meth_insts
xtve = inst_tyvars `zip` inst_tyvars'
tc_method_bind = tcMethodBind xtve inst_tyvars' dfun_theta' all_insts uprags
+ meth_ids = [meth_id | (_,meth_id,_) <- meth_infos]
in
+
mapM tc_method_bind meth_infos `thenM` \ meth_binds_s ->
- returnM ([meth_id | (_,meth_id,_) <- meth_infos],
- andMonoBindList meth_binds_s)
+ returnM (meth_ids, unionManyBags meth_binds_s)
-- Derived newtype instances
-tcMethods clas inst_tyvars inst_tyvars' dfun_theta' inst_tys'
+tcMethods origin clas inst_tyvars inst_tyvars' dfun_theta' inst_tys'
avail_insts op_items (NewTypeDerived rep_tys)
- = getInstLoc InstanceDeclOrigin `thenM` \ inst_loc ->
+ = getInstLoc origin `thenM` \ inst_loc ->
mapAndUnzip3M (do_one inst_loc) op_items `thenM` \ (meth_ids, meth_binds, rhs_insts) ->
tcSimplifyCheck
-- I don't think we have to do the checkSigTyVars thing
- returnM (meth_ids, lie_binds `AndMonoBinds` andMonoBindList meth_binds)
+ returnM (meth_ids, lie_binds `unionBags` listToBag meth_binds)
where
do_one inst_loc (sel_id, _)
let
meth_id = instToId meth_inst
in
- return (meth_id, VarMonoBind meth_id (HsVar (instToId rhs_inst)), rhs_inst)
+ return (meth_id, noLoc (VarBind meth_id (nlHsVar (instToId rhs_inst))), rhs_inst)
-- Instantiate rep_tys with the relevant type variables
- rep_tys' = map (substTy subst) rep_tys
- subst = mkTyVarSubst inst_tyvars (mkTyVarTys inst_tyvars')
+ rep_tys' = substTys subst rep_tys
+ subst = zipTvSubst inst_tyvars (mkTyVarTys inst_tyvars')
\end{code}
Note: [Superclass loops]
dfun_arg_dicts
sc_dicts) `thenM` \ (sc_binds1, sc_lie) ->
- -- It's possible that the superclass stuff might have done unification
- checkSigTyVars inst_tyvars' `thenM` \ zonked_inst_tyvars ->
-
-- We must simplify this all the way down
-- lest we build superclass loops
-- See Note [Superclass loops] above
tcSimplifyTop sc_lie `thenM` \ sc_binds2 ->
- returnM (zonked_inst_tyvars, sc_binds1, sc_binds2)
+ returnM (sc_binds1, sc_binds2)
where
doc = ptext SLIT("instance declaration superclass context")
\begin{code}
instDeclCtxt1 hs_inst_ty
- = inst_decl_ctxt (case hs_inst_ty of
- HsForAllTy _ _ (HsPredTy pred) -> ppr pred
- HsPredTy pred -> ppr pred
- other -> ppr hs_inst_ty) -- Don't expect this
+ = inst_decl_ctxt (case unLoc hs_inst_ty of
+ HsForAllTy _ _ _ (L _ (HsPredTy pred)) -> ppr pred
+ HsPredTy pred -> ppr pred
+ other -> ppr hs_inst_ty) -- Don't expect this
instDeclCtxt2 dfun_ty
= inst_decl_ctxt (ppr (mkClassPred cls tys))
where
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