\begin{code}
module TcHsSyn (
- TcMonoBinds, TcHsBinds, TcPat,
- TcExpr, TcGRHSs, TcGRHS, TcMatch,
- TcStmt, TcArithSeqInfo, TcRecordBinds,
- TcHsModule, TcDictBinds,
- TcForeignDecl,
+ TcDictBinds,
+ mkHsTyApp, mkHsDictApp, mkHsConApp,
+ mkHsTyLam, mkHsDictLam, mkHsLet, mkHsApp,
+ hsLitType, hsPatType, mkHsAppTy, mkSimpleHsAlt,
+ nlHsIntLit, glueBindsOnGRHSs,
- TypecheckedHsBinds, TypecheckedRuleDecl,
- TypecheckedMonoBinds, TypecheckedPat,
- TypecheckedHsExpr, TypecheckedArithSeqInfo,
- TypecheckedStmt, TypecheckedForeignDecl,
- TypecheckedMatch, TypecheckedHsModule,
- TypecheckedGRHSs, TypecheckedGRHS,
- TypecheckedRecordBinds, TypecheckedDictBinds,
- TypecheckedMatchContext, TypecheckedCoreBind,
- mkHsTyApp, mkHsDictApp, mkHsConApp,
- mkHsTyLam, mkHsDictLam, mkHsLet,
- hsLitType, hsPatType,
+ -- Coercions
+ Coercion, ExprCoFn, PatCoFn,
+ (<$>), (<.>), mkCoercion,
+ idCoercion, isIdCoercion,
-- re-exported from TcMonad
TcId, TcIdSet,
- zonkTopBinds, zonkTopDecls, zonkTopExpr,
- zonkId, zonkIdBndr
+ zonkTopDecls, zonkTopExpr, zonkTopLExpr,
+ zonkId, zonkTopBndrs
) where
#include "HsVersions.h"
-- others:
import Id ( idType, setIdType, Id )
-import DataCon ( dataConWrapId )
import TcRnMonad
import Type ( Type )
-import TcType ( TcType, tcGetTyVar )
-import TcMType ( zonkTcTypeToType, zonkTcTyVarToTyVar, zonkTcType, zonkTcTyVars )
+import TcType ( TcType, TcTyVar, eqKind, isTypeKind, mkTyVarTy,
+ tcGetTyVar, isAnyTypeKind, mkTyConApp )
+import qualified Type
+import TcMType ( zonkTcTyVarToTyVar, zonkType, zonkTcType, zonkTcTyVars,
+ putTcTyVar )
import TysPrim ( charPrimTy, intPrimTy, floatPrimTy,
doublePrimTy, addrPrimTy
)
-import TysWiredIn ( charTy, stringTy, intTy, integerTy,
- mkListTy, mkPArrTy, mkTupleTy, unitTy )
-import CoreSyn ( CoreExpr )
-import Var ( isId, isLocalVar )
+import TysWiredIn ( charTy, stringTy, intTy,
+ mkListTy, mkPArrTy, mkTupleTy, unitTy,
+ voidTy, listTyCon, tupleTyCon )
+import TyCon ( mkPrimTyCon, tyConKind )
+import PrimRep ( PrimRep(VoidRep) )
+import Name ( getOccName, mkInternalName, mkDerivedTyConOcc )
+import Var ( Var, isId, isLocalVar, tyVarKind )
+import VarSet
import VarEnv
-import BasicTypes ( RecFlag(..), Boxity(..), IPName(..), ipNameName, mapIPName )
+import BasicTypes ( Boxity(..), IPName(..), ipNameName, mapIPName )
import Maybes ( orElse )
+import Maybe ( isNothing )
+import Unique ( Uniquable(..) )
+import SrcLoc ( noSrcLoc, noLoc, Located(..), unLoc )
import Bag
import Outputable
\end{code}
-Type definitions
-~~~~~~~~~~~~~~~~
-
-The @Tc...@ datatypes are the ones that apply {\em during} type checking.
-All the types in @Tc...@ things have mutable type-variables in them for
-unification.
-
-At the end of type checking we zonk everything to @Typechecked...@ datatypes,
-which have immutable type variables in them.
-
-\begin{code}
-type TcHsBinds = HsBinds TcId
-type TcMonoBinds = MonoBinds TcId
-type TcDictBinds = TcMonoBinds
-type TcPat = OutPat TcId
-type TcExpr = HsExpr TcId
-type TcGRHSs = GRHSs TcId
-type TcGRHS = GRHS TcId
-type TcMatch = Match TcId
-type TcStmt = Stmt TcId
-type TcArithSeqInfo = ArithSeqInfo TcId
-type TcRecordBinds = HsRecordBinds TcId
-type TcHsModule = HsModule TcId
-type TcForeignDecl = ForeignDecl TcId
-type TcRuleDecl = RuleDecl TcId
-
-type TypecheckedPat = OutPat Id
-type TypecheckedMonoBinds = MonoBinds Id
-type TypecheckedDictBinds = TypecheckedMonoBinds
-type TypecheckedHsBinds = HsBinds Id
-type TypecheckedHsExpr = HsExpr Id
-type TypecheckedArithSeqInfo = ArithSeqInfo Id
-type TypecheckedStmt = Stmt Id
-type TypecheckedMatch = Match Id
-type TypecheckedMatchContext = HsMatchContext Id
-type TypecheckedGRHSs = GRHSs Id
-type TypecheckedGRHS = GRHS Id
-type TypecheckedRecordBinds = HsRecordBinds Id
-type TypecheckedHsModule = HsModule Id
-type TypecheckedForeignDecl = ForeignDecl Id
-type TypecheckedRuleDecl = RuleDecl Id
-type TypecheckedCoreBind = (Id, CoreExpr)
-\end{code}
-
\begin{code}
-mkHsTyApp expr [] = expr
-mkHsTyApp expr tys = TyApp expr tys
-
-mkHsDictApp expr [] = expr
-mkHsDictApp expr dict_vars = DictApp expr dict_vars
-
-mkHsTyLam [] expr = expr
-mkHsTyLam tyvars expr = TyLam tyvars expr
-
-mkHsDictLam [] expr = expr
-mkHsDictLam dicts expr = DictLam dicts expr
-
-mkHsLet EmptyMonoBinds expr = expr
-mkHsLet mbinds expr = HsLet (MonoBind mbinds [] Recursive) expr
-
-mkHsConApp data_con tys args = foldl HsApp (HsVar (dataConWrapId data_con) `mkHsTyApp` tys) args
+type TcDictBinds = LHsBinds TcId -- Bag of dictionary bindings
\end{code}
Note: If @hsPatType@ doesn't bear a strong resemblance to @exprType@,
then something is wrong.
\begin{code}
-hsPatType :: TypecheckedPat -> Type
-
-hsPatType (ParPat pat) = hsPatType pat
-hsPatType (WildPat ty) = ty
-hsPatType (VarPat var) = idType var
-hsPatType (LazyPat pat) = hsPatType pat
-hsPatType (LitPat lit) = hsLitType lit
-hsPatType (AsPat var pat) = idType var
-hsPatType (ListPat _ ty) = mkListTy ty
-hsPatType (PArrPat _ ty) = mkPArrTy ty
-hsPatType (TuplePat pats box) = mkTupleTy box (length pats) (map hsPatType pats)
-hsPatType (ConPatOut _ _ ty _ _) = ty
-hsPatType (SigPatOut _ ty _) = ty
-hsPatType (NPatOut lit ty _) = ty
-hsPatType (NPlusKPatOut id _ _ _) = idType id
-hsPatType (DictPat ds ms) = case (ds ++ ms) of
+hsPatType :: OutPat Id -> Type
+hsPatType pat = pat_type (unLoc pat)
+
+pat_type (ParPat pat) = hsPatType pat
+pat_type (WildPat ty) = ty
+pat_type (VarPat var) = idType var
+pat_type (LazyPat pat) = hsPatType pat
+pat_type (LitPat lit) = hsLitType lit
+pat_type (AsPat var pat) = idType (unLoc var)
+pat_type (ListPat _ ty) = mkListTy ty
+pat_type (PArrPat _ ty) = mkPArrTy ty
+pat_type (TuplePat pats box) = mkTupleTy box (length pats) (map hsPatType pats)
+pat_type (ConPatOut _ _ ty _ _) = ty
+pat_type (SigPatOut _ ty _) = ty
+pat_type (NPatOut lit ty _) = ty
+pat_type (NPlusKPatOut id _ _ _) = idType (unLoc id)
+pat_type (DictPat ds ms) = case (ds ++ ms) of
[] -> unitTy
[d] -> idType d
ds -> mkTupleTy Boxed (length ds) (map idType ds)
hsLitType (HsStringPrim s) = addrPrimTy
hsLitType (HsInt i) = intTy
hsLitType (HsIntPrim i) = intPrimTy
-hsLitType (HsInteger i) = integerTy
+hsLitType (HsInteger i ty) = ty
hsLitType (HsRat _ ty) = ty
hsLitType (HsFloatPrim f) = floatPrimTy
hsLitType (HsDoublePrim d) = doublePrimTy
-hsLitType (HsLitLit _ ty) = ty
\end{code}
+%************************************************************************
+%* *
+\subsection{Coercion functions}
+%* *
+%************************************************************************
+
\begin{code}
--- zonkId is used *during* typechecking just to zonk the Id's type
-zonkId :: TcId -> TcM TcId
-zonkId id
- = zonkTcType (idType id) `thenM` \ ty' ->
- returnM (setIdType id ty')
+type Coercion a = Maybe (a -> a)
+ -- Nothing => identity fn
+
+type ExprCoFn = Coercion (HsExpr TcId)
+type PatCoFn = Coercion (Pat TcId)
+
+(<.>) :: Coercion a -> Coercion a -> Coercion a -- Composition
+Nothing <.> Nothing = Nothing
+Nothing <.> Just f = Just f
+Just f <.> Nothing = Just f
+Just f1 <.> Just f2 = Just (f1 . f2)
+
+(<$>) :: Coercion a -> a -> a
+Just f <$> e = f e
+Nothing <$> e = e
+
+mkCoercion :: (a -> a) -> Coercion a
+mkCoercion f = Just f
+
+idCoercion :: Coercion a
+idCoercion = Nothing
+
+isIdCoercion :: Coercion a -> Bool
+isIdCoercion = isNothing
\end{code}
%* *
%************************************************************************
-This zonking pass runs over the bindings
+\begin{code}
+-- zonkId is used *during* typechecking just to zonk the Id's type
+zonkId :: TcId -> TcM TcId
+zonkId id
+ = zonkTcType (idType id) `thenM` \ ty' ->
+ returnM (setIdType id ty')
+\end{code}
+
+The rest of the zonking is done *after* typechecking.
+The main zonking pass runs over the bindings
a) to convert TcTyVars to TyVars etc, dereferencing any bindings etc
b) convert unbound TcTyVar to Void
the environment manipulation is tiresome.
\begin{code}
-type ZonkEnv = IdEnv Id
+data ZonkEnv = ZonkEnv (TcType -> TcM Type) -- How to zonk a type
+ (IdEnv Id) -- What variables are in scope
-- Maps an Id to its zonked version; both have the same Name
-- Is only consulted lazily; hence knot-tying
-emptyZonkEnv = emptyVarEnv
+emptyZonkEnv = ZonkEnv zonkTypeZapping emptyVarEnv
extendZonkEnv :: ZonkEnv -> [Id] -> ZonkEnv
-extendZonkEnv env ids = extendVarEnvList env [(id,id) | id <- ids]
+extendZonkEnv (ZonkEnv zonk_ty env) ids
+ = ZonkEnv zonk_ty (extendVarEnvList env [(id,id) | id <- ids])
+
+setZonkType :: ZonkEnv -> (TcType -> TcM Type) -> ZonkEnv
+setZonkType (ZonkEnv _ env) zonk_ty = ZonkEnv zonk_ty env
mkZonkEnv :: [Id] -> ZonkEnv
mkZonkEnv ids = extendZonkEnv emptyZonkEnv ids
--
-- Even without template splices, in module Main, the checking of
-- 'main' is done as a separte chunk.
-zonkIdOcc env id
+zonkIdOcc (ZonkEnv zonk_ty env) id
| isLocalVar id = lookupVarEnv env id `orElse` id
| otherwise = id
-- zonkIdBndr is used *after* typechecking to get the Id's type
-- to its final form. The TyVarEnv give
-zonkIdBndr :: TcId -> TcM Id
-zonkIdBndr id
- = zonkTcTypeToType (idType id) `thenM` \ ty' ->
+zonkIdBndr :: ZonkEnv -> TcId -> TcM Id
+zonkIdBndr env id
+ = zonkTcTypeToType env (idType id) `thenM` \ ty' ->
returnM (setIdType id ty')
+
+zonkIdBndrs :: ZonkEnv -> [TcId] -> TcM [Id]
+zonkIdBndrs env ids = mappM (zonkIdBndr env) ids
+
+zonkTopBndrs :: [TcId] -> TcM [Id]
+zonkTopBndrs ids = zonkIdBndrs emptyZonkEnv ids
\end{code}
\begin{code}
-zonkTopExpr :: TcExpr -> TcM TypecheckedHsExpr
+zonkTopExpr :: HsExpr TcId -> TcM (HsExpr Id)
zonkTopExpr e = zonkExpr emptyZonkEnv e
-zonkTopDecls :: TcMonoBinds -> [TcRuleDecl] -> [TcForeignDecl]
+zonkTopLExpr :: LHsExpr TcId -> TcM (LHsExpr Id)
+zonkTopLExpr e = zonkLExpr emptyZonkEnv e
+
+zonkTopDecls :: Bag (LHsBind TcId) -> [LRuleDecl TcId] -> [LForeignDecl TcId]
-> TcM ([Id],
- TypecheckedMonoBinds,
- [TypecheckedForeignDecl],
- [TypecheckedRuleDecl])
+ Bag (LHsBind Id),
+ [LForeignDecl Id],
+ [LRuleDecl Id])
zonkTopDecls binds rules fords -- Top level is implicitly recursive
= fixM (\ ~(new_ids, _, _, _) ->
let
zonk_env = mkZonkEnv new_ids
in
- zonkMonoBinds zonk_env binds `thenM` \ (binds', new_ids) ->
+ zonkMonoBinds zonk_env binds `thenM` \ binds' ->
zonkRules zonk_env rules `thenM` \ rules' ->
zonkForeignExports zonk_env fords `thenM` \ fords' ->
- returnM (bagToList new_ids, binds', fords', rules')
- )
-
-zonkTopBinds :: TcMonoBinds -> TcM ([Id], TypecheckedMonoBinds)
-zonkTopBinds binds
- = fixM (\ ~(new_ids, _) ->
- let
- zonk_env = mkZonkEnv new_ids
- in
- zonkMonoBinds zonk_env binds `thenM` \ (binds', new_ids) ->
- returnM (bagToList new_ids, binds')
+ returnM (collectHsBindBinders binds', binds', fords', rules')
)
---------------------------------------------
-zonkBinds :: ZonkEnv -> TcHsBinds -> TcM (ZonkEnv, TypecheckedHsBinds)
-zonkBinds env EmptyBinds = returnM (env, EmptyBinds)
-
-zonkBinds env (ThenBinds b1 b2)
- = zonkBinds env b1 `thenM` \ (env1, b1') ->
- zonkBinds env1 b2 `thenM` \ (env2, b2') ->
- returnM (env2, b1' `ThenBinds` b2')
-
-zonkBinds env (MonoBind bind sigs is_rec)
+zonkGroup :: ZonkEnv -> HsBindGroup TcId -> TcM (ZonkEnv, HsBindGroup Id)
+zonkGroup env (HsBindGroup bs sigs is_rec)
= ASSERT( null sigs )
- fixM (\ ~(env1, _) ->
- zonkMonoBinds env1 bind `thenM` \ (new_bind, new_ids) ->
- let
- env2 = extendZonkEnv env (bagToList new_ids)
- in
- returnM (env2, mkMonoBind new_bind [] is_rec)
- )
+ do { (env1, bs') <- fixM (\ ~(_, new_binds) -> do
+ { let env1 = extendZonkEnv env (collectHsBindBinders new_binds)
+ ; bs' <- zonkMonoBinds env1 bs
+ ; return (env1, bs') })
+ ; return (env1, HsBindGroup bs' [] is_rec) }
+
+
+zonkGroup env (HsIPBinds binds)
+ = mappM (wrapLocM zonk_ip_bind) binds `thenM` \ new_binds ->
+ let
+ env1 = extendZonkEnv env [ipNameName n | L _ (IPBind n _) <- new_binds]
+ in
+ returnM (env1, HsIPBinds new_binds)
+ where
+ zonk_ip_bind (IPBind n e)
+ = mapIPNameTc (zonkIdBndr env) n `thenM` \ n' ->
+ zonkLExpr env e `thenM` \ e' ->
+ returnM (IPBind n' e')
---------------------------------------------
-zonkMonoBinds :: ZonkEnv -> TcMonoBinds
- -> TcM (TypecheckedMonoBinds, Bag Id)
+zonkNestedBinds :: ZonkEnv -> [HsBindGroup TcId] -> TcM (ZonkEnv, [HsBindGroup Id])
+zonkNestedBinds env [] = return (env, [])
+zonkNestedBinds env (b:bs) = do { (env1, b') <- zonkGroup env b
+ ; (env2, bs') <- zonkNestedBinds env1 bs
+ ; return (env2, b':bs') }
-zonkMonoBinds env EmptyMonoBinds = returnM (EmptyMonoBinds, emptyBag)
-
-zonkMonoBinds env (AndMonoBinds mbinds1 mbinds2)
- = zonkMonoBinds env mbinds1 `thenM` \ (b1', ids1) ->
- zonkMonoBinds env mbinds2 `thenM` \ (b2', ids2) ->
- returnM (b1' `AndMonoBinds` b2',
- ids1 `unionBags` ids2)
+---------------------------------------------
+zonkMonoBinds :: ZonkEnv -> Bag (LHsBind TcId) -> TcM (Bag (LHsBind Id))
+zonkMonoBinds env binds = mapBagM (wrapLocM (zonk_bind env)) binds
-zonkMonoBinds env (PatMonoBind pat grhss locn)
- = zonkPat env pat `thenM` \ (new_pat, ids) ->
+zonk_bind :: ZonkEnv -> HsBind TcId -> TcM (HsBind Id)
+zonk_bind env (PatBind pat grhss)
+ = zonkPat env pat `thenM` \ (new_pat, _) ->
zonkGRHSs env grhss `thenM` \ new_grhss ->
- returnM (PatMonoBind new_pat new_grhss locn, ids)
+ returnM (PatBind new_pat new_grhss)
-zonkMonoBinds env (VarMonoBind var expr)
- = zonkIdBndr var `thenM` \ new_var ->
- zonkExpr env expr `thenM` \ new_expr ->
- returnM (VarMonoBind new_var new_expr, unitBag new_var)
+zonk_bind env (VarBind var expr)
+ = zonkIdBndr env var `thenM` \ new_var ->
+ zonkLExpr env expr `thenM` \ new_expr ->
+ returnM (VarBind new_var new_expr)
-zonkMonoBinds env (CoreMonoBind var core_expr)
- = zonkIdBndr var `thenM` \ new_var ->
- returnM (CoreMonoBind new_var core_expr, unitBag new_var)
-
-zonkMonoBinds env (FunMonoBind var inf ms locn)
- = zonkIdBndr var `thenM` \ new_var ->
+zonk_bind env (FunBind var inf ms)
+ = wrapLocM (zonkIdBndr env) var `thenM` \ new_var ->
mappM (zonkMatch env) ms `thenM` \ new_ms ->
- returnM (FunMonoBind new_var inf new_ms locn, unitBag new_var)
-
+ returnM (FunBind new_var inf new_ms)
-zonkMonoBinds env (AbsBinds tyvars dicts exports inlines val_bind)
+zonk_bind env (AbsBinds tyvars dicts exports inlines val_binds)
= mappM zonkTcTyVarToTyVar tyvars `thenM` \ new_tyvars ->
-- No need to extend tyvar env: the effects are
-- propagated through binding the tyvars themselves
- mappM zonkIdBndr dicts `thenM` \ new_dicts ->
- fixM (\ ~(_, _, val_bind_ids) ->
+ zonkIdBndrs env dicts `thenM` \ new_dicts ->
+ fixM (\ ~(new_val_binds, _) ->
let
env1 = extendZonkEnv (extendZonkEnv env new_dicts)
- (bagToList val_bind_ids)
+ (collectHsBindBinders new_val_binds)
in
- zonkMonoBinds env1 val_bind `thenM` \ (new_val_bind, val_bind_ids) ->
- mappM (zonkExport env1) exports `thenM` \ new_exports ->
- returnM (new_val_bind, new_exports, val_bind_ids)
- ) `thenM ` \ (new_val_bind, new_exports, _) ->
- let
- new_globals = listToBag [global | (_, global, local) <- new_exports]
- in
- returnM (AbsBinds new_tyvars new_dicts new_exports inlines new_val_bind,
- new_globals)
+ zonkMonoBinds env1 val_binds `thenM` \ new_val_binds ->
+ mappM (zonkExport env1) exports `thenM` \ new_exports ->
+ returnM (new_val_binds, new_exports)
+ ) `thenM` \ (new_val_bind, new_exports) ->
+ returnM (AbsBinds new_tyvars new_dicts new_exports inlines new_val_bind)
where
zonkExport env (tyvars, global, local)
= zonkTcTyVars tyvars `thenM` \ tys ->
-- This isn't the binding occurrence of these tyvars
-- but they should *be* tyvars. Hence tcGetTyVar.
in
- zonkIdBndr global `thenM` \ new_global ->
+ zonkIdBndr env global `thenM` \ new_global ->
returnM (new_tyvars, new_global, zonkIdOcc env local)
\end{code}
%************************************************************************
\begin{code}
-zonkMatch :: ZonkEnv -> TcMatch -> TcM TypecheckedMatch
+zonkMatch :: ZonkEnv -> LMatch TcId-> TcM (LMatch Id)
-zonkMatch env (Match pats _ grhss)
+zonkMatch env (L loc (Match pats _ grhss))
= zonkPats env pats `thenM` \ (new_pats, new_ids) ->
zonkGRHSs (extendZonkEnv env (bagToList new_ids)) grhss `thenM` \ new_grhss ->
- returnM (Match new_pats Nothing new_grhss)
+ returnM (L loc (Match new_pats Nothing new_grhss))
-------------------------------------------------------------------------
-zonkGRHSs :: ZonkEnv -> TcGRHSs -> TcM TypecheckedGRHSs
+zonkGRHSs :: ZonkEnv -> GRHSs TcId -> TcM (GRHSs Id)
zonkGRHSs env (GRHSs grhss binds ty)
- = zonkBinds env binds `thenM` \ (new_env, new_binds) ->
+ = zonkNestedBinds env binds `thenM` \ (new_env, new_binds) ->
let
- zonk_grhs (GRHS guarded locn)
- = zonkStmts new_env guarded `thenM` \ new_guarded ->
- returnM (GRHS new_guarded locn)
+ zonk_grhs (GRHS guarded)
+ = zonkStmts new_env guarded `thenM` \ new_guarded ->
+ returnM (GRHS new_guarded)
in
- mappM zonk_grhs grhss `thenM` \ new_grhss ->
- zonkTcTypeToType ty `thenM` \ new_ty ->
+ mappM (wrapLocM zonk_grhs) grhss `thenM` \ new_grhss ->
+ zonkTcTypeToType env ty `thenM` \ new_ty ->
returnM (GRHSs new_grhss new_binds new_ty)
\end{code}
%************************************************************************
\begin{code}
-zonkExpr :: ZonkEnv -> TcExpr -> TcM TypecheckedHsExpr
+zonkLExprs :: ZonkEnv -> [LHsExpr TcId] -> TcM [LHsExpr Id]
+zonkLExpr :: ZonkEnv -> LHsExpr TcId -> TcM (LHsExpr Id)
+zonkExpr :: ZonkEnv -> HsExpr TcId -> TcM (HsExpr Id)
+
+zonkLExprs env exprs = mappM (zonkLExpr env) exprs
+zonkLExpr env expr = wrapLocM (zonkExpr env) expr
zonkExpr env (HsVar id)
= returnM (HsVar (zonkIdOcc env id))
= returnM (HsIPVar (mapIPName (zonkIdOcc env) id))
zonkExpr env (HsLit (HsRat f ty))
- = zonkTcTypeToType ty `thenM` \ new_ty ->
+ = zonkTcTypeToType env ty `thenM` \ new_ty ->
returnM (HsLit (HsRat f new_ty))
-zonkExpr env (HsLit (HsLitLit lit ty))
- = zonkTcTypeToType ty `thenM` \ new_ty ->
- returnM (HsLit (HsLitLit lit new_ty))
-
zonkExpr env (HsLit lit)
= returnM (HsLit lit)
returnM (HsLam new_match)
zonkExpr env (HsApp e1 e2)
- = zonkExpr env e1 `thenM` \ new_e1 ->
- zonkExpr env e2 `thenM` \ new_e2 ->
+ = zonkLExpr env e1 `thenM` \ new_e1 ->
+ zonkLExpr env e2 `thenM` \ new_e2 ->
returnM (HsApp new_e1 new_e2)
zonkExpr env (HsBracketOut body bs)
= mappM zonk_b bs `thenM` \ bs' ->
returnM (HsBracketOut body bs')
where
- zonk_b (n,e) = zonkExpr env e `thenM` \ e' ->
+ zonk_b (n,e) = zonkLExpr env e `thenM` \ e' ->
returnM (n,e')
-zonkExpr env (HsSplice n e) = WARN( True, ppr e ) -- Should not happen
- returnM (HsSplice n e)
+zonkExpr env (HsSpliceE s) = WARN( True, ppr s ) -- Should not happen
+ returnM (HsSpliceE s)
zonkExpr env (OpApp e1 op fixity e2)
- = zonkExpr env e1 `thenM` \ new_e1 ->
- zonkExpr env op `thenM` \ new_op ->
- zonkExpr env e2 `thenM` \ new_e2 ->
+ = zonkLExpr env e1 `thenM` \ new_e1 ->
+ zonkLExpr env op `thenM` \ new_op ->
+ zonkLExpr env e2 `thenM` \ new_e2 ->
returnM (OpApp new_e1 new_op fixity new_e2)
zonkExpr env (NegApp _ _) = panic "zonkExpr env: NegApp"
zonkExpr env (HsPar e)
- = zonkExpr env e `thenM` \new_e ->
+ = zonkLExpr env e `thenM` \new_e ->
returnM (HsPar new_e)
zonkExpr env (SectionL expr op)
- = zonkExpr env expr `thenM` \ new_expr ->
- zonkExpr env op `thenM` \ new_op ->
+ = zonkLExpr env expr `thenM` \ new_expr ->
+ zonkLExpr env op `thenM` \ new_op ->
returnM (SectionL new_expr new_op)
zonkExpr env (SectionR op expr)
- = zonkExpr env op `thenM` \ new_op ->
- zonkExpr env expr `thenM` \ new_expr ->
+ = zonkLExpr env op `thenM` \ new_op ->
+ zonkLExpr env expr `thenM` \ new_expr ->
returnM (SectionR new_op new_expr)
-zonkExpr env (HsCase expr ms src_loc)
- = zonkExpr env expr `thenM` \ new_expr ->
+zonkExpr env (HsCase expr ms)
+ = zonkLExpr env expr `thenM` \ new_expr ->
mappM (zonkMatch env) ms `thenM` \ new_ms ->
- returnM (HsCase new_expr new_ms src_loc)
+ returnM (HsCase new_expr new_ms)
-zonkExpr env (HsIf e1 e2 e3 src_loc)
- = zonkExpr env e1 `thenM` \ new_e1 ->
- zonkExpr env e2 `thenM` \ new_e2 ->
- zonkExpr env e3 `thenM` \ new_e3 ->
- returnM (HsIf new_e1 new_e2 new_e3 src_loc)
+zonkExpr env (HsIf e1 e2 e3)
+ = zonkLExpr env e1 `thenM` \ new_e1 ->
+ zonkLExpr env e2 `thenM` \ new_e2 ->
+ zonkLExpr env e3 `thenM` \ new_e3 ->
+ returnM (HsIf new_e1 new_e2 new_e3)
zonkExpr env (HsLet binds expr)
- = zonkBinds env binds `thenM` \ (new_env, new_binds) ->
- zonkExpr new_env expr `thenM` \ new_expr ->
+ = zonkNestedBinds env binds `thenM` \ (new_env, new_binds) ->
+ zonkLExpr new_env expr `thenM` \ new_expr ->
returnM (HsLet new_binds new_expr)
-zonkExpr env (HsWith expr binds is_with)
- = mappM zonk_ip_bind binds `thenM` \ new_binds ->
- let
- env1 = extendZonkEnv env (map (ipNameName . fst) new_binds)
- in
- zonkExpr env1 expr `thenM` \ new_expr ->
- returnM (HsWith new_expr new_binds is_with)
- where
- zonk_ip_bind (n, e)
- = mapIPNameTc zonkIdBndr n `thenM` \ n' ->
- zonkExpr env e `thenM` \ e' ->
- returnM (n', e')
-
-zonkExpr env (HsDo do_or_lc stmts ids ty src_loc)
+zonkExpr env (HsDo do_or_lc stmts ids ty)
= zonkStmts env stmts `thenM` \ new_stmts ->
- zonkTcTypeToType ty `thenM` \ new_ty ->
- returnM (HsDo do_or_lc new_stmts
- (zonkIdOccs env ids)
- new_ty src_loc)
+ zonkTcTypeToType env ty `thenM` \ new_ty ->
+ zonkReboundNames env ids `thenM` \ new_ids ->
+ returnM (HsDo do_or_lc new_stmts new_ids new_ty)
zonkExpr env (ExplicitList ty exprs)
- = zonkTcTypeToType ty `thenM` \ new_ty ->
- mappM (zonkExpr env) exprs `thenM` \ new_exprs ->
+ = zonkTcTypeToType env ty `thenM` \ new_ty ->
+ zonkLExprs env exprs `thenM` \ new_exprs ->
returnM (ExplicitList new_ty new_exprs)
zonkExpr env (ExplicitPArr ty exprs)
- = zonkTcTypeToType ty `thenM` \ new_ty ->
- mappM (zonkExpr env) exprs `thenM` \ new_exprs ->
+ = zonkTcTypeToType env ty `thenM` \ new_ty ->
+ zonkLExprs env exprs `thenM` \ new_exprs ->
returnM (ExplicitPArr new_ty new_exprs)
zonkExpr env (ExplicitTuple exprs boxed)
- = mappM (zonkExpr env) exprs `thenM` \ new_exprs ->
+ = zonkLExprs env exprs `thenM` \ new_exprs ->
returnM (ExplicitTuple new_exprs boxed)
zonkExpr env (RecordConOut data_con con_expr rbinds)
- = zonkExpr env con_expr `thenM` \ new_con_expr ->
+ = zonkLExpr env con_expr `thenM` \ new_con_expr ->
zonkRbinds env rbinds `thenM` \ new_rbinds ->
returnM (RecordConOut data_con new_con_expr new_rbinds)
zonkExpr env (RecordUpd _ _) = panic "zonkExpr env:RecordUpd"
zonkExpr env (RecordUpdOut expr in_ty out_ty rbinds)
- = zonkExpr env expr `thenM` \ new_expr ->
- zonkTcTypeToType in_ty `thenM` \ new_in_ty ->
- zonkTcTypeToType out_ty `thenM` \ new_out_ty ->
+ = zonkLExpr env expr `thenM` \ new_expr ->
+ zonkTcTypeToType env in_ty `thenM` \ new_in_ty ->
+ zonkTcTypeToType env out_ty `thenM` \ new_out_ty ->
zonkRbinds env rbinds `thenM` \ new_rbinds ->
returnM (RecordUpdOut new_expr new_in_ty new_out_ty new_rbinds)
zonkExpr env (PArrSeqIn _) = panic "zonkExpr env:PArrSeqIn"
zonkExpr env (ArithSeqOut expr info)
- = zonkExpr env expr `thenM` \ new_expr ->
+ = zonkLExpr env expr `thenM` \ new_expr ->
zonkArithSeq env info `thenM` \ new_info ->
returnM (ArithSeqOut new_expr new_info)
zonkExpr env (PArrSeqOut expr info)
- = zonkExpr env expr `thenM` \ new_expr ->
+ = zonkLExpr env expr `thenM` \ new_expr ->
zonkArithSeq env info `thenM` \ new_info ->
returnM (PArrSeqOut new_expr new_info)
-zonkExpr env (HsCCall fun args may_gc is_casm result_ty)
- = mappM (zonkExpr env) args `thenM` \ new_args ->
- zonkTcTypeToType result_ty `thenM` \ new_result_ty ->
- returnM (HsCCall fun new_args may_gc is_casm new_result_ty)
-
zonkExpr env (HsSCC lbl expr)
- = zonkExpr env expr `thenM` \ new_expr ->
+ = zonkLExpr env expr `thenM` \ new_expr ->
returnM (HsSCC lbl new_expr)
+-- hdaume: core annotations
+zonkExpr env (HsCoreAnn lbl expr)
+ = zonkLExpr env expr `thenM` \ new_expr ->
+ returnM (HsCoreAnn lbl new_expr)
+
zonkExpr env (TyLam tyvars expr)
= mappM zonkTcTyVarToTyVar tyvars `thenM` \ new_tyvars ->
-- No need to extend tyvar env; see AbsBinds
- zonkExpr env expr `thenM` \ new_expr ->
+ zonkLExpr env expr `thenM` \ new_expr ->
returnM (TyLam new_tyvars new_expr)
zonkExpr env (TyApp expr tys)
- = zonkExpr env expr `thenM` \ new_expr ->
- mappM zonkTcTypeToType tys `thenM` \ new_tys ->
+ = zonkLExpr env expr `thenM` \ new_expr ->
+ mappM (zonkTcTypeToType env) tys `thenM` \ new_tys ->
returnM (TyApp new_expr new_tys)
zonkExpr env (DictLam dicts expr)
- = mappM zonkIdBndr dicts `thenM` \ new_dicts ->
+ = zonkIdBndrs env dicts `thenM` \ new_dicts ->
let
env1 = extendZonkEnv env new_dicts
in
- zonkExpr env1 expr `thenM` \ new_expr ->
+ zonkLExpr env1 expr `thenM` \ new_expr ->
returnM (DictLam new_dicts new_expr)
zonkExpr env (DictApp expr dicts)
- = zonkExpr env expr `thenM` \ new_expr ->
+ = zonkLExpr env expr `thenM` \ new_expr ->
returnM (DictApp new_expr (zonkIdOccs env dicts))
+-- arrow notation extensions
+zonkExpr env (HsProc pat body)
+ = zonkPat env pat `thenM` \ (new_pat, new_ids) ->
+ let
+ env1 = extendZonkEnv env (bagToList new_ids)
+ in
+ zonkCmdTop env1 body `thenM` \ new_body ->
+ returnM (HsProc new_pat new_body)
+
+zonkExpr env (HsArrApp e1 e2 ty ho rl)
+ = zonkLExpr env e1 `thenM` \ new_e1 ->
+ zonkLExpr env e2 `thenM` \ new_e2 ->
+ zonkTcTypeToType env ty `thenM` \ new_ty ->
+ returnM (HsArrApp new_e1 new_e2 new_ty ho rl)
+
+zonkExpr env (HsArrForm op fixity args)
+ = zonkLExpr env op `thenM` \ new_op ->
+ mappM (zonkCmdTop env) args `thenM` \ new_args ->
+ returnM (HsArrForm new_op fixity new_args)
+
+zonkCmdTop :: ZonkEnv -> LHsCmdTop TcId -> TcM (LHsCmdTop Id)
+zonkCmdTop env cmd = wrapLocM (zonk_cmd_top env) cmd
+
+zonk_cmd_top env (HsCmdTop cmd stack_tys ty ids)
+ = zonkLExpr env cmd `thenM` \ new_cmd ->
+ mappM (zonkTcTypeToType env) stack_tys
+ `thenM` \ new_stack_tys ->
+ zonkTcTypeToType env ty `thenM` \ new_ty ->
+ zonkReboundNames env ids `thenM` \ new_ids ->
+ returnM (HsCmdTop new_cmd new_stack_tys new_ty new_ids)
+
+-------------------------------------------------------------------------
+zonkReboundNames :: ZonkEnv -> ReboundNames Id -> TcM (ReboundNames Id)
+zonkReboundNames env prs
+ = mapM zonk prs
+ where
+ zonk (n, e) = zonkLExpr env e `thenM` \ new_e ->
+ returnM (n, new_e)
-------------------------------------------------------------------------
-zonkArithSeq :: ZonkEnv -> TcArithSeqInfo -> TcM TypecheckedArithSeqInfo
+zonkArithSeq :: ZonkEnv -> ArithSeqInfo TcId -> TcM (ArithSeqInfo Id)
zonkArithSeq env (From e)
- = zonkExpr env e `thenM` \ new_e ->
+ = zonkLExpr env e `thenM` \ new_e ->
returnM (From new_e)
zonkArithSeq env (FromThen e1 e2)
- = zonkExpr env e1 `thenM` \ new_e1 ->
- zonkExpr env e2 `thenM` \ new_e2 ->
+ = zonkLExpr env e1 `thenM` \ new_e1 ->
+ zonkLExpr env e2 `thenM` \ new_e2 ->
returnM (FromThen new_e1 new_e2)
zonkArithSeq env (FromTo e1 e2)
- = zonkExpr env e1 `thenM` \ new_e1 ->
- zonkExpr env e2 `thenM` \ new_e2 ->
+ = zonkLExpr env e1 `thenM` \ new_e1 ->
+ zonkLExpr env e2 `thenM` \ new_e2 ->
returnM (FromTo new_e1 new_e2)
zonkArithSeq env (FromThenTo e1 e2 e3)
- = zonkExpr env e1 `thenM` \ new_e1 ->
- zonkExpr env e2 `thenM` \ new_e2 ->
- zonkExpr env e3 `thenM` \ new_e3 ->
+ = zonkLExpr env e1 `thenM` \ new_e1 ->
+ zonkLExpr env e2 `thenM` \ new_e2 ->
+ zonkLExpr env e3 `thenM` \ new_e3 ->
returnM (FromThenTo new_e1 new_e2 new_e3)
+
-------------------------------------------------------------------------
-zonkStmts :: ZonkEnv -> [TcStmt] -> TcM [TypecheckedStmt]
+zonkStmts :: ZonkEnv -> [LStmt TcId] -> TcM [LStmt Id]
+
+zonkStmts env stmts = zonk_stmts env stmts `thenM` \ (_, stmts) ->
+ returnM stmts
-zonkStmts env [] = returnM []
+zonk_stmts :: ZonkEnv -> [LStmt TcId] -> TcM (ZonkEnv, [LStmt Id])
+zonk_stmts env [] = return (env, [])
+zonk_stmts env (s:ss) = do { (env1, s') <- wrapLocSndM (zonkStmt env) s
+ ; (env2, ss') <- zonk_stmts env1 ss
+ ; return (env2, s' : ss') }
-zonkStmts env (ParStmtOut bndrstmtss : stmts)
- = mappM (mappM zonkId) bndrss `thenM` \ new_bndrss ->
- mappM (zonkStmts env) stmtss `thenM` \ new_stmtss ->
+zonkStmt :: ZonkEnv -> Stmt TcId -> TcM (ZonkEnv, Stmt Id)
+zonkStmt env (ParStmt stmts_w_bndrs)
+ = mappM zonk_branch stmts_w_bndrs `thenM` \ new_stmts_w_bndrs ->
let
- new_binders = concat new_bndrss
+ new_binders = concat (map snd new_stmts_w_bndrs)
env1 = extendZonkEnv env new_binders
in
- zonkStmts env1 stmts `thenM` \ new_stmts ->
- returnM (ParStmtOut (zip new_bndrss new_stmtss) : new_stmts)
+ return (env1, ParStmt new_stmts_w_bndrs)
where
- (bndrss, stmtss) = unzip bndrstmtss
-
-zonkStmts env (ResultStmt expr locn : stmts)
- = zonkExpr env expr `thenM` \ new_expr ->
- zonkStmts env stmts `thenM` \ new_stmts ->
- returnM (ResultStmt new_expr locn : new_stmts)
-
-zonkStmts env (ExprStmt expr ty locn : stmts)
- = zonkExpr env expr `thenM` \ new_expr ->
- zonkTcTypeToType ty `thenM` \ new_ty ->
- zonkStmts env stmts `thenM` \ new_stmts ->
- returnM (ExprStmt new_expr new_ty locn : new_stmts)
-
-zonkStmts env (LetStmt binds : stmts)
- = zonkBinds env binds `thenM` \ (new_env, new_binds) ->
- zonkStmts new_env stmts `thenM` \ new_stmts ->
- returnM (LetStmt new_binds : new_stmts)
-
-zonkStmts env (BindStmt pat expr locn : stmts)
- = zonkExpr env expr `thenM` \ new_expr ->
+ zonk_branch (stmts, bndrs) = zonk_stmts env stmts `thenM` \ (env1, new_stmts) ->
+ returnM (new_stmts, zonkIdOccs env1 bndrs)
+
+zonkStmt env (RecStmt segStmts lvs rvs rets)
+ = zonkIdBndrs env rvs `thenM` \ new_rvs ->
+ let
+ env1 = extendZonkEnv env new_rvs
+ in
+ zonk_stmts env1 segStmts `thenM` \ (env2, new_segStmts) ->
+ -- Zonk the ret-expressions in an envt that
+ -- has the polymorphic bindings in the envt
+ zonkLExprs env2 rets `thenM` \ new_rets ->
+ let
+ new_lvs = zonkIdOccs env2 lvs
+ env3 = extendZonkEnv env new_lvs -- Only the lvs are needed
+ in
+ returnM (env3, RecStmt new_segStmts new_lvs new_rvs new_rets)
+
+zonkStmt env (ResultStmt expr)
+ = zonkLExpr env expr `thenM` \ new_expr ->
+ returnM (env, ResultStmt new_expr)
+
+zonkStmt env (ExprStmt expr ty)
+ = zonkLExpr env expr `thenM` \ new_expr ->
+ zonkTcTypeToType env ty `thenM` \ new_ty ->
+ returnM (env, ExprStmt new_expr new_ty)
+
+zonkStmt env (LetStmt binds)
+ = zonkNestedBinds env binds `thenM` \ (env1, new_binds) ->
+ returnM (env1, LetStmt new_binds)
+
+zonkStmt env (BindStmt pat expr)
+ = zonkLExpr env expr `thenM` \ new_expr ->
zonkPat env pat `thenM` \ (new_pat, new_ids) ->
let
env1 = extendZonkEnv env (bagToList new_ids)
in
- zonkStmts env1 stmts `thenM` \ new_stmts ->
- returnM (BindStmt new_pat new_expr locn : new_stmts)
+ returnM (env1, BindStmt new_pat new_expr)
-------------------------------------------------------------------------
-zonkRbinds :: ZonkEnv -> TcRecordBinds -> TcM TypecheckedRecordBinds
+zonkRbinds :: ZonkEnv -> HsRecordBinds TcId -> TcM (HsRecordBinds Id)
zonkRbinds env rbinds
= mappM zonk_rbind rbinds
where
zonk_rbind (field, expr)
- = zonkExpr env expr `thenM` \ new_expr ->
- returnM (zonkIdOcc env field, new_expr)
+ = zonkLExpr env expr `thenM` \ new_expr ->
+ returnM (fmap (zonkIdOcc env) field, new_expr)
-------------------------------------------------------------------------
mapIPNameTc :: (a -> TcM b) -> IPName a -> TcM (IPName b)
%************************************************************************
\begin{code}
-zonkPat :: ZonkEnv -> TcPat -> TcM (TypecheckedPat, Bag Id)
+zonkPat :: ZonkEnv -> OutPat TcId -> TcM (OutPat Id, Bag Id)
+zonkPat env pat = wrapLocFstM (zonk_pat env) pat
-zonkPat env (ParPat p)
+zonk_pat env (ParPat p)
= zonkPat env p `thenM` \ (new_p, ids) ->
returnM (ParPat new_p, ids)
-zonkPat env (WildPat ty)
- = zonkTcTypeToType ty `thenM` \ new_ty ->
+zonk_pat env (WildPat ty)
+ = zonkTcTypeToType env ty `thenM` \ new_ty ->
returnM (WildPat new_ty, emptyBag)
-zonkPat env (VarPat v)
- = zonkIdBndr v `thenM` \ new_v ->
+zonk_pat env (VarPat v)
+ = zonkIdBndr env v `thenM` \ new_v ->
returnM (VarPat new_v, unitBag new_v)
-zonkPat env (LazyPat pat)
+zonk_pat env (LazyPat pat)
= zonkPat env pat `thenM` \ (new_pat, ids) ->
returnM (LazyPat new_pat, ids)
-zonkPat env (AsPat n pat)
- = zonkIdBndr n `thenM` \ new_n ->
- zonkPat env pat `thenM` \ (new_pat, ids) ->
- returnM (AsPat new_n new_pat, new_n `consBag` ids)
+zonk_pat env (AsPat n pat)
+ = wrapLocM (zonkIdBndr env) n `thenM` \ new_n ->
+ zonkPat env pat `thenM` \ (new_pat, ids) ->
+ returnM (AsPat new_n new_pat, unLoc new_n `consBag` ids)
-zonkPat env (ListPat pats ty)
- = zonkTcTypeToType ty `thenM` \ new_ty ->
+zonk_pat env (ListPat pats ty)
+ = zonkTcTypeToType env ty `thenM` \ new_ty ->
zonkPats env pats `thenM` \ (new_pats, ids) ->
returnM (ListPat new_pats new_ty, ids)
-zonkPat env (PArrPat pats ty)
- = zonkTcTypeToType ty `thenM` \ new_ty ->
+zonk_pat env (PArrPat pats ty)
+ = zonkTcTypeToType env ty `thenM` \ new_ty ->
zonkPats env pats `thenM` \ (new_pats, ids) ->
returnM (PArrPat new_pats new_ty, ids)
-zonkPat env (TuplePat pats boxed)
+zonk_pat env (TuplePat pats boxed)
= zonkPats env pats `thenM` \ (new_pats, ids) ->
returnM (TuplePat new_pats boxed, ids)
-zonkPat env (ConPatOut n stuff ty tvs dicts)
- = zonkTcTypeToType ty `thenM` \ new_ty ->
+zonk_pat env (ConPatOut n stuff ty tvs dicts)
+ = zonkTcTypeToType env ty `thenM` \ new_ty ->
mappM zonkTcTyVarToTyVar tvs `thenM` \ new_tvs ->
- mappM zonkIdBndr dicts `thenM` \ new_dicts ->
+ zonkIdBndrs env dicts `thenM` \ new_dicts ->
let
env1 = extendZonkEnv env new_dicts
in
- zonkConStuff env stuff `thenM` \ (new_stuff, ids) ->
+ zonkConStuff env1 stuff `thenM` \ (new_stuff, ids) ->
returnM (ConPatOut n new_stuff new_ty new_tvs new_dicts,
listToBag new_dicts `unionBags` ids)
-zonkPat env (LitPat lit) = returnM (LitPat lit, emptyBag)
+zonk_pat env (LitPat lit) = returnM (LitPat lit, emptyBag)
-zonkPat env (SigPatOut pat ty expr)
- = zonkPat env pat `thenM` \ (new_pat, ids) ->
- zonkTcTypeToType ty `thenM` \ new_ty ->
+zonk_pat env (SigPatOut pat ty expr)
+ = zonkPat env pat `thenM` \ (new_pat, ids) ->
+ zonkTcTypeToType env ty `thenM` \ new_ty ->
zonkExpr env expr `thenM` \ new_expr ->
returnM (SigPatOut new_pat new_ty new_expr, ids)
-zonkPat env (NPatOut lit ty expr)
- = zonkTcTypeToType ty `thenM` \ new_ty ->
+zonk_pat env (NPatOut lit ty expr)
+ = zonkTcTypeToType env ty `thenM` \ new_ty ->
zonkExpr env expr `thenM` \ new_expr ->
returnM (NPatOut lit new_ty new_expr, emptyBag)
-zonkPat env (NPlusKPatOut n k e1 e2)
- = zonkIdBndr n `thenM` \ new_n ->
+zonk_pat env (NPlusKPatOut n k e1 e2)
+ = wrapLocM (zonkIdBndr env) n `thenM` \ new_n ->
zonkExpr env e1 `thenM` \ new_e1 ->
zonkExpr env e2 `thenM` \ new_e2 ->
- returnM (NPlusKPatOut new_n k new_e1 new_e2, unitBag new_n)
+ returnM (NPlusKPatOut new_n k new_e1 new_e2, unitBag (unLoc new_n))
-zonkPat env (DictPat ds ms)
- = mappM zonkIdBndr ds `thenM` \ new_ds ->
- mappM zonkIdBndr ms `thenM` \ new_ms ->
+zonk_pat env (DictPat ds ms)
+ = zonkIdBndrs env ds `thenM` \ new_ds ->
+ zonkIdBndrs env ms `thenM` \ new_ms ->
returnM (DictPat new_ds new_ms,
listToBag new_ds `unionBags` listToBag new_ms)
\begin{code}
-zonkForeignExports :: ZonkEnv -> [TcForeignDecl] -> TcM [TypecheckedForeignDecl]
-zonkForeignExports env ls = mappM (zonkForeignExport env) ls
-
-zonkForeignExport :: ZonkEnv -> TcForeignDecl -> TcM (TypecheckedForeignDecl)
-zonkForeignExport env (ForeignExport i hs_ty spec isDeprec src_loc) =
- returnM (ForeignExport (zonkIdOcc env i) undefined spec isDeprec src_loc)
+zonkForeignExports :: ZonkEnv -> [LForeignDecl TcId] -> TcM [LForeignDecl Id]
+zonkForeignExports env ls = mappM (wrapLocM (zonkForeignExport env)) ls
+
+zonkForeignExport :: ZonkEnv -> ForeignDecl TcId -> TcM (ForeignDecl Id)
+zonkForeignExport env (ForeignExport i hs_ty spec isDeprec) =
+ returnM (ForeignExport (fmap (zonkIdOcc env) i) undefined spec isDeprec)
+zonkForeignExport env for_imp
+ = returnM for_imp -- Foreign imports don't need zonking
\end{code}
\begin{code}
-zonkRules :: ZonkEnv -> [TcRuleDecl] -> TcM [TypecheckedRuleDecl]
-zonkRules env rs = mappM (zonkRule env) rs
+zonkRules :: ZonkEnv -> [LRuleDecl TcId] -> TcM [LRuleDecl Id]
+zonkRules env rs = mappM (wrapLocM (zonkRule env)) rs
-zonkRule env (HsRule name act vars lhs rhs loc)
- = mappM zonk_bndr vars `thenM` \ new_bndrs ->
+zonkRule :: ZonkEnv -> RuleDecl TcId -> TcM (RuleDecl Id)
+zonkRule env (HsRule name act (vars::[RuleBndr TcId]) lhs rhs)
+ = mappM zonk_bndr vars `thenM` \ new_bndrs ->
+ newMutVar emptyVarSet `thenM` \ unbound_tv_set ->
let
- env1 = extendZonkEnv env (filter isId new_bndrs)
+ env_rhs = extendZonkEnv env [id | b <- new_bndrs, let id = unLoc b, isId id]
-- Type variables don't need an envt
-- They are bound through the mutable mechanism
+
+ env_lhs = setZonkType env_rhs (zonkTypeCollecting unbound_tv_set)
+ -- We need to gather the type variables mentioned on the LHS so we can
+ -- quantify over them. Example:
+ -- data T a = C
+ --
+ -- foo :: T a -> Int
+ -- foo C = 1
+ --
+ -- {-# RULES "myrule" foo C = 1 #-}
+ --
+ -- After type checking the LHS becomes (foo a (C a))
+ -- and we do not want to zap the unbound tyvar 'a' to (), because
+ -- that limits the applicability of the rule. Instead, we
+ -- want to quantify over it!
+ --
+ -- It's easiest to find the free tyvars here. Attempts to do so earlier
+ -- are tiresome, because (a) the data type is big and (b) finding the
+ -- free type vars of an expression is necessarily monadic operation.
+ -- (consider /\a -> f @ b, where b is side-effected to a)
in
- zonkExpr env1 lhs `thenM` \ new_lhs ->
- zonkExpr env1 rhs `thenM` \ new_rhs ->
- returnM (HsRule name act (map RuleBndr new_bndrs) new_lhs new_rhs loc)
- -- I hate this map RuleBndr stuff
+ zonkLExpr env_lhs lhs `thenM` \ new_lhs ->
+ zonkLExpr env_rhs rhs `thenM` \ new_rhs ->
+
+ readMutVar unbound_tv_set `thenM` \ unbound_tvs ->
+ let
+ final_bndrs :: [Located Var]
+ final_bndrs = map noLoc (varSetElems unbound_tvs) ++ new_bndrs
+ in
+ returnM (HsRule name act (map RuleBndr final_bndrs) new_lhs new_rhs)
+ -- I hate this map RuleBndr stuff
where
zonk_bndr (RuleBndr v)
- | isId v = zonkIdBndr v
- | otherwise = zonkTcTyVarToTyVar v
-
-zonkRule env (IfaceRuleOut fun rule)
- = returnM (IfaceRuleOut (zonkIdOcc env fun) rule)
+ | isId (unLoc v) = wrapLocM (zonkIdBndr env) v
+ | otherwise = wrapLocM zonkTcTyVarToTyVar v
\end{code}
+
+%************************************************************************
+%* *
+\subsection[BackSubst-Foreign]{Foreign exports}
+%* *
+%************************************************************************
+
+\begin{code}
+zonkTcTypeToType :: ZonkEnv -> TcType -> TcM Type
+zonkTcTypeToType (ZonkEnv zonk_ty _) ty = zonk_ty ty
+
+zonkTypeCollecting :: TcRef TyVarSet -> TcType -> TcM Type
+-- This variant collects unbound type variables in a mutable variable
+zonkTypeCollecting unbound_tv_set
+ = zonkType zonk_unbound_tyvar
+ where
+ zonk_unbound_tyvar tv
+ = zonkTcTyVarToTyVar tv `thenM` \ tv' ->
+ readMutVar unbound_tv_set `thenM` \ tv_set ->
+ writeMutVar unbound_tv_set (extendVarSet tv_set tv') `thenM_`
+ return (mkTyVarTy tv')
+
+zonkTypeZapping :: TcType -> TcM Type
+-- This variant is used for everything except the LHS of rules
+-- It zaps unbound type variables to (), or some other arbitrary type
+zonkTypeZapping ty
+ = zonkType zonk_unbound_tyvar ty
+ where
+ -- Zonk a mutable but unbound type variable to an arbitrary type
+ -- We know it's unbound even though we don't carry an environment,
+ -- because at the binding site for a type variable we bind the
+ -- mutable tyvar to a fresh immutable one. So the mutable store
+ -- plays the role of an environment. If we come across a mutable
+ -- type variable that isn't so bound, it must be completely free.
+ zonk_unbound_tyvar tv = putTcTyVar tv (mkArbitraryType tv)
+
+
+-- When the type checker finds a type variable with no binding,
+-- which means it can be instantiated with an arbitrary type, it
+-- usually instantiates it to Void. Eg.
+--
+-- length []
+-- ===>
+-- length Void (Nil Void)
+--
+-- But in really obscure programs, the type variable might have
+-- a kind other than *, so we need to invent a suitably-kinded type.
+--
+-- This commit uses
+-- Void for kind *
+-- List for kind *->*
+-- Tuple for kind *->...*->*
+--
+-- which deals with most cases. (Previously, it only dealt with
+-- kind *.)
+--
+-- In the other cases, it just makes up a TyCon with a suitable
+-- kind. If this gets into an interface file, anyone reading that
+-- file won't understand it. This is fixable (by making the client
+-- of the interface file make up a TyCon too) but it is tiresome and
+-- never happens, so I am leaving it
+
+mkArbitraryType :: TcTyVar -> Type
+-- Make up an arbitrary type whose kind is the same as the tyvar.
+-- We'll use this to instantiate the (unbound) tyvar.
+mkArbitraryType tv
+ | isAnyTypeKind kind = voidTy -- The vastly common case
+ | otherwise = mkTyConApp tycon []
+ where
+ kind = tyVarKind tv
+ (args,res) = Type.splitFunTys kind -- Kinds are simple; use Type.splitFunTys
+
+ tycon | kind `eqKind` tyConKind listTyCon -- *->*
+ = listTyCon -- No tuples this size
+
+ | all isTypeKind args && isTypeKind res
+ = tupleTyCon Boxed (length args) -- *-> ... ->*->*
+
+ | otherwise
+ = pprTrace "Urk! Inventing strangely-kinded void TyCon:" (ppr tc_name $$ ppr kind) $
+ mkPrimTyCon tc_name kind 0 [] VoidRep
+ -- Same name as the tyvar, apart from making it start with a colon (sigh)
+ -- I dread to think what will happen if this gets out into an
+ -- interface file. Catastrophe likely. Major sigh.
+
+ tc_name = mkInternalName (getUnique tv) (mkDerivedTyConOcc (getOccName tv)) noSrcLoc
+\end{code}