X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=ghc%2Fcompiler%2Ftypecheck%2FTcHsSyn.lhs;h=79fbcd1cedc809d4a3f2fad15a5c26a1915a2897;hb=e83fa2eba7ef2302fae8a6be86a9f495b4144387;hp=a0f779fcafa51c8a3c3a37b97e93cbeb16d9c07a;hpb=26741ec416bae2c502ef00a2ba0e79050a32cb67;p=ghc-hetmet.git diff --git a/ghc/compiler/typecheck/TcHsSyn.lhs b/ghc/compiler/typecheck/TcHsSyn.lhs index a0f779f..79fbcd1 100644 --- a/ghc/compiler/typecheck/TcHsSyn.lhs +++ b/ghc/compiler/typecheck/TcHsSyn.lhs @@ -1,5 +1,5 @@ % -% (c) The AQUA Project, Glasgow University, 1996 +% (c) The AQUA Project, Glasgow University, 1996-1998 % \section[TcHsSyn]{Specialisations of the @HsSyn@ syntax for the typechecker} @@ -7,59 +7,68 @@ This module is an extension of @HsSyn@ syntax, for use in the type checker. \begin{code} -#include "HsVersions.h" - module TcHsSyn ( - TcIdBndr(..), TcIdOcc(..), + TcMonoBinds, TcHsBinds, TcPat, + TcExpr, TcGRHSs, TcGRHS, TcMatch, + TcStmt, TcArithSeqInfo, TcRecordBinds, + TcHsModule, TcDictBinds, + TcForeignDecl, - TcMonoBinds(..), TcHsBinds(..), TcBind(..), TcPat(..), - TcExpr(..), TcGRHSsAndBinds(..), TcGRHS(..), TcMatch(..), - TcQual(..), TcStmt(..), TcArithSeqInfo(..), TcRecordBinds(..), - TcHsModule(..), - - TypecheckedHsBinds(..), TypecheckedBind(..), - TypecheckedMonoBinds(..), TypecheckedPat(..), - TypecheckedHsExpr(..), TypecheckedArithSeqInfo(..), - TypecheckedQual(..), TypecheckedStmt(..), - TypecheckedMatch(..), TypecheckedHsModule(..), - TypecheckedGRHSsAndBinds(..), TypecheckedGRHS(..), - TypecheckedRecordBinds(..), - - mkHsTyApp, mkHsDictApp, - mkHsTyLam, mkHsDictLam, - tcIdType, tcIdTyVars, - - zonkBinds, - zonkDictBinds + TypecheckedHsBinds, TypecheckedRuleDecl, + TypecheckedMonoBinds, TypecheckedPat, + TypecheckedHsExpr, TypecheckedArithSeqInfo, + TypecheckedStmt, TypecheckedForeignDecl, + TypecheckedMatch, TypecheckedHsModule, + TypecheckedGRHSs, TypecheckedGRHS, + TypecheckedRecordBinds, TypecheckedDictBinds, + TypecheckedMatchContext, TypecheckedCoreBind, + + mkHsTyApp, mkHsDictApp, mkHsConApp, + mkHsTyLam, mkHsDictLam, mkHsLet, + hsLitType, hsPatType, + + -- re-exported from TcMonad + TcId, TcIdSet, + + zonkTopBinds, zonkTopDecls, zonkTopExpr, + zonkId, zonkTopBndrs ) where -IMP_Ubiq(){-uitous-} +#include "HsVersions.h" -- friends: import HsSyn -- oodles of it -import Id ( GenId(..), IdDetails, PragmaInfo, -- Can meddle modestly with Ids - SYN_IE(DictVar), idType, - SYN_IE(IdEnv), growIdEnvList, lookupIdEnv - ) -- others: -import Name ( Name{--O only-} ) -import TcMonad hiding ( rnMtoTcM ) -import TcType ( TcType(..), TcMaybe, TcTyVar(..), - zonkTcTypeToType, zonkTcTyVarToTyVar - ) -import Usage ( SYN_IE(UVar) ) -import Util ( zipEqual, panic, pprPanic, pprTrace ) - -import PprType ( GenType, GenTyVar ) -- instances -import Type ( mkTyVarTy, tyVarsOfType ) -import TyVar ( GenTyVar {- instances -}, - SYN_IE(TyVarEnv), growTyVarEnvList, emptyTyVarSet ) -import TysPrim ( voidTy ) -import Unique ( Unique ) -- instances -import UniqFM -import PprStyle -import Pretty +import Id ( idType, setIdType, Id ) +import DataCon ( dataConWrapId ) + +import TcRnMonad +import Type ( Type ) +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, + voidTy, listTyCon, tupleTyCon ) +import TyCon ( mkPrimTyCon, tyConKind ) +import PrimRep ( PrimRep(VoidRep) ) +import CoreSyn ( CoreExpr ) +import Name ( Name, getOccName, mkInternalName, mkDerivedTyConOcc ) +import Var ( isId, isLocalVar, tyVarKind ) +import VarSet +import VarEnv +import BasicTypes ( RecFlag(..), Boxity(..), IPName(..), ipNameName, mapIPName ) +import Maybes ( orElse ) +import Unique ( Uniquable(..) ) +import SrcLoc ( noSrcLoc ) +import Bag +import Outputable \end{code} @@ -74,37 +83,39 @@ At the end of type checking we zonk everything to @Typechecked...@ datatypes, which have immutable type variables in them. \begin{code} -type TcIdBndr s = GenId (TcType s) -- Binders are all TcTypes -data TcIdOcc s = TcId (TcIdBndr s) -- Bindees may be either - | RealId Id - -type TcHsBinds s = HsBinds (TcTyVar s) UVar (TcIdOcc s) (TcPat s) -type TcBind s = Bind (TcTyVar s) UVar (TcIdOcc s) (TcPat s) -type TcMonoBinds s = MonoBinds (TcTyVar s) UVar (TcIdOcc s) (TcPat s) -type TcPat s = OutPat (TcTyVar s) UVar (TcIdOcc s) -type TcExpr s = HsExpr (TcTyVar s) UVar (TcIdOcc s) (TcPat s) -type TcGRHSsAndBinds s = GRHSsAndBinds (TcTyVar s) UVar (TcIdOcc s) (TcPat s) -type TcGRHS s = GRHS (TcTyVar s) UVar (TcIdOcc s) (TcPat s) -type TcMatch s = Match (TcTyVar s) UVar (TcIdOcc s) (TcPat s) -type TcQual s = Qualifier (TcTyVar s) UVar (TcIdOcc s) (TcPat s) -type TcStmt s = Stmt (TcTyVar s) UVar (TcIdOcc s) (TcPat s) -type TcArithSeqInfo s = ArithSeqInfo (TcTyVar s) UVar (TcIdOcc s) (TcPat s) -type TcRecordBinds s = HsRecordBinds (TcTyVar s) UVar (TcIdOcc s) (TcPat s) -type TcHsModule s = HsModule (TcTyVar s) UVar (TcIdOcc s) (TcPat s) - -type TypecheckedPat = OutPat TyVar UVar Id -type TypecheckedMonoBinds = MonoBinds TyVar UVar Id TypecheckedPat -type TypecheckedHsBinds = HsBinds TyVar UVar Id TypecheckedPat -type TypecheckedBind = Bind TyVar UVar Id TypecheckedPat -type TypecheckedHsExpr = HsExpr TyVar UVar Id TypecheckedPat -type TypecheckedArithSeqInfo = ArithSeqInfo TyVar UVar Id TypecheckedPat -type TypecheckedQual = Qualifier TyVar UVar Id TypecheckedPat -type TypecheckedStmt = Stmt TyVar UVar Id TypecheckedPat -type TypecheckedMatch = Match TyVar UVar Id TypecheckedPat -type TypecheckedGRHSsAndBinds = GRHSsAndBinds TyVar UVar Id TypecheckedPat -type TypecheckedGRHS = GRHS TyVar UVar Id TypecheckedPat -type TypecheckedRecordBinds = HsRecordBinds TyVar UVar Id TypecheckedPat -type TypecheckedHsModule = HsModule TyVar UVar Id TypecheckedPat +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 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) + +type TypecheckedMatchContext = HsMatchContext Name -- Keeps consistency with + -- HsDo arg StmtContext \end{code} \begin{code} @@ -120,27 +131,63 @@ mkHsTyLam tyvars expr = TyLam tyvars expr mkHsDictLam [] expr = expr mkHsDictLam dicts expr = DictLam dicts expr -tcIdType :: TcIdOcc s -> TcType s -tcIdType (TcId id) = idType id -tcIdType (RealId id) = pprPanic "tcIdType:" (ppr PprDebug id) +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 +\end{code} + -tcIdTyVars (TcId id) = tyVarsOfType (idType id) -tcIdTyVars (RealId _) = emptyTyVarSet -- Top level Ids have no free type variables +%************************************************************************ +%* * +\subsection[mkFailurePair]{Code for pattern-matching and other failures} +%* * +%************************************************************************ + +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 + [] -> unitTy + [d] -> idType d + ds -> mkTupleTy Boxed (length ds) (map idType ds) + + +hsLitType :: HsLit -> TcType +hsLitType (HsChar c) = charTy +hsLitType (HsCharPrim c) = charPrimTy +hsLitType (HsString str) = stringTy +hsLitType (HsStringPrim s) = addrPrimTy +hsLitType (HsInt i) = intTy +hsLitType (HsIntPrim i) = intPrimTy +hsLitType (HsInteger i) = integerTy +hsLitType (HsRat _ ty) = ty +hsLitType (HsFloatPrim f) = floatPrimTy +hsLitType (HsDoublePrim d) = doublePrimTy +hsLitType (HsLitLit _ ty) = ty \end{code} \begin{code} -instance Eq (TcIdOcc s) where - (TcId id1) == (TcId id2) = id1 == id2 - (RealId id1) == (RealId id2) = id1 == id2 - _ == _ = False - -instance Outputable (TcIdOcc s) where - ppr sty (TcId id) = ppr sty id - ppr sty (RealId id) = ppr sty id - -instance NamedThing (TcIdOcc s) where - getName (TcId id) = getName id - getName (RealId id) = getName id +-- 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} @@ -154,188 +201,222 @@ This zonking pass runs over the bindings a) to convert TcTyVars to TyVars etc, dereferencing any bindings etc b) convert unbound TcTyVar to Void + c) convert each TcId to an Id by zonking its type -We pass an environment around so that - a) we know which TyVars are unbound - b) we maintain sharing; eg an Id is zonked at its binding site and they - all occurrences of that Id point to the common zonked copy +The type variables are converted by binding mutable tyvars to immutable ones +and then zonking as normal. + +The Ids are converted by binding them in the normal Tc envt; that +way we maintain sharing; eg an Id is zonked at its binding site and they +all occurrences of that Id point to the common zonked copy It's all pretty boring stuff, because HsSyn is such a large type, and the environment manipulation is tiresome. - \begin{code} -zonkIdBndr :: TyVarEnv Type -> TcIdOcc s -> NF_TcM s Id -zonkIdBndr te (TcId (Id u n ty details prags info)) - = zonkTcTypeToType te ty `thenNF_Tc` \ ty' -> - returnNF_Tc (Id u n ty' details prags info) - -zonkIdBndr te (RealId id) = returnNF_Tc id - -zonkIdOcc :: IdEnv Id -> TcIdOcc s -> Id -zonkIdOcc ve (RealId id) = id -zonkIdOcc ve (TcId id) = case (lookupIdEnv ve id) of - Just id' -> id' - Nothing -> pprTrace "zonkIdOcc: " (ppr PprDebug id) $ - Id u n voidTy details prags info - where - Id u n _ details prags info = id - -extend_ve ve ids = growIdEnvList ve [(id,id) | id <- ids] -extend_te te tyvars = growTyVarEnvList te [(tyvar, mkTyVarTy tyvar) | tyvar <- tyvars] +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 = ZonkEnv zonkTypeZapping emptyVarEnv + +extendZonkEnv :: ZonkEnv -> [Id] -> ZonkEnv +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 + +zonkIdOcc :: ZonkEnv -> TcId -> Id +-- Ids defined in this module should be in the envt; +-- ignore others. (Actually, data constructors are also +-- not LocalVars, even when locally defined, but that is fine.) +-- +-- Actually, Template Haskell works in 'chunks' of declarations, and +-- an earlier chunk won't be in the 'env' that the zonking phase +-- carries around. Instead it'll be in the tcg_gbl_env, already fully +-- zonked. There's no point in looking it up there (except for error +-- checking), and it's not conveniently to hand; hence the simple +-- 'orElse' case in the LocalVar branch. +-- +-- Even without template splices, in module Main, the checking of +-- 'main' is done as a separte chunk. +zonkIdOcc (ZonkEnv zonk_ty env) id + | isLocalVar id = lookupVarEnv env id `orElse` id + | otherwise = id + +zonkIdOccs env ids = map (zonkIdOcc env) ids + +-- zonkIdBndr is used *after* typechecking to get the Id's type +-- to its final form. The TyVarEnv give +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} - -- Implicitly mutually recursive, which is overkill, - -- but it means that later ones see earlier ones -zonkDictBinds te ve dbs - = fixNF_Tc (\ ~(_,new_ve) -> - zonkDictBindsLocal te new_ve dbs `thenNF_Tc` \ (new_binds, dict_ids) -> - returnNF_Tc (new_binds, extend_ve ve dict_ids) +zonkTopExpr :: TcExpr -> TcM TypecheckedHsExpr +zonkTopExpr e = zonkExpr emptyZonkEnv e + +zonkTopDecls :: TcMonoBinds -> [TcRuleDecl] -> [TcForeignDecl] + -> TcM ([Id], + TypecheckedMonoBinds, + [TypecheckedForeignDecl], + [TypecheckedRuleDecl]) +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) -> + zonkRules zonk_env rules `thenM` \ rules' -> + zonkForeignExports zonk_env fords `thenM` \ fords' -> + + returnM (bagToList new_ids, binds', fords', rules') ) - -- The ..Local version assumes the caller has set up - -- a ve that contains all the things bound here -zonkDictBindsLocal te ve [] = returnNF_Tc ([], []) +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') + ) -zonkDictBindsLocal te ve ((dict,rhs) : binds) - = zonkIdBndr te dict `thenNF_Tc` \ new_dict -> - zonkExpr te ve rhs `thenNF_Tc` \ new_rhs -> - zonkDictBindsLocal te ve binds `thenNF_Tc` \ (new_binds, dict_ids) -> - returnNF_Tc ((new_dict,new_rhs) : new_binds, - new_dict:dict_ids) -\end{code} +--------------------------------------------- +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) + = ASSERT( null sigs ) + fixM (\ ~(_, _, new_ids) -> + let + env1 = extendZonkEnv env (bagToList new_ids) + in + zonkMonoBinds env1 bind `thenM` \ (new_bind, new_ids) -> + returnM (env1, new_bind, new_ids) + ) `thenM` \ (env1, new_bind, _) -> + returnM (env1, mkMonoBind is_rec new_bind) + +zonkBinds env (IPBinds binds is_with) + = mappM zonk_ip_bind binds `thenM` \ new_binds -> + let + env1 = extendZonkEnv env (map (ipNameName . fst) new_binds) + in + returnM (env1, IPBinds new_binds is_with) + where + zonk_ip_bind (n, e) + = mapIPNameTc (zonkIdBndr env) n `thenM` \ n' -> + zonkExpr env e `thenM` \ e' -> + returnM (n', e') -\begin{code} -zonkBinds :: TyVarEnv Type -> IdEnv Id - -> TcHsBinds s -> NF_TcM s (TypecheckedHsBinds, IdEnv Id) -zonkBinds te ve EmptyBinds = returnNF_Tc (EmptyBinds, ve) +--------------------------------------------- +zonkMonoBinds :: ZonkEnv -> TcMonoBinds + -> TcM (TypecheckedMonoBinds, Bag Id) -zonkBinds te ve (ThenBinds binds1 binds2) - = zonkBinds te ve binds1 `thenNF_Tc` \ (new_binds1, ve1) -> - zonkBinds te ve1 binds2 `thenNF_Tc` \ (new_binds2, ve2) -> - returnNF_Tc (ThenBinds new_binds1 new_binds2, ve2) +zonkMonoBinds env EmptyMonoBinds = returnM (EmptyMonoBinds, emptyBag) -zonkBinds te ve (SingleBind bind) - = fixNF_Tc (\ ~(_,new_ve) -> - zonkBind te new_ve bind `thenNF_Tc` \ (new_bind, new_ids) -> - returnNF_Tc (SingleBind new_bind, extend_ve ve new_ids) - ) +zonkMonoBinds env (AndMonoBinds mbinds1 mbinds2) + = zonkMonoBinds env mbinds1 `thenM` \ (b1', ids1) -> + zonkMonoBinds env mbinds2 `thenM` \ (b2', ids2) -> + returnM (b1' `AndMonoBinds` b2', + ids1 `unionBags` ids2) -zonkBinds te ve (AbsBinds tyvars dicts locprs dict_binds val_bind) - = mapNF_Tc zonkTcTyVarToTyVar tyvars `thenNF_Tc` \ new_tyvars -> - let - new_te = extend_te te new_tyvars - in - mapNF_Tc (zonkIdBndr new_te) dicts `thenNF_Tc` \ new_dicts -> - mapNF_Tc (zonkIdBndr new_te) globals `thenNF_Tc` \ new_globals -> - let - ve1 = extend_ve ve new_globals - ve2 = extend_ve ve1 new_dicts - in - fixNF_Tc (\ ~(_, ve3) -> - zonkDictBindsLocal new_te ve3 dict_binds `thenNF_Tc` \ (new_dict_binds, ds) -> - zonkBind new_te ve3 val_bind `thenNF_Tc` \ (new_val_bind, ls) -> - let - new_locprs = zipEqual "zonkBinds" (map (zonkIdOcc ve3) locals) new_globals - in - returnNF_Tc (AbsBinds new_tyvars new_dicts new_locprs new_dict_binds new_val_bind, - extend_ve ve2 (ds++ls)) - ) `thenNF_Tc` \ (binds, _) -> - returnNF_Tc (binds, ve1) -- Yes, the "ve1" is right (SLPJ) - where - (locals, globals) = unzip locprs -\end{code} +zonkMonoBinds env (PatMonoBind pat grhss locn) + = zonkPat env pat `thenM` \ (new_pat, ids) -> + zonkGRHSs env grhss `thenM` \ new_grhss -> + returnM (PatMonoBind new_pat new_grhss locn, ids) -\begin{code} -------------------------------------------------------------------------- -zonkBind :: TyVarEnv Type -> IdEnv Id - -> TcBind s -> NF_TcM s (TypecheckedBind, [Id]) +zonkMonoBinds env (VarMonoBind var expr) + = zonkIdBndr env var `thenM` \ new_var -> + zonkExpr env expr `thenM` \ new_expr -> + returnM (VarMonoBind new_var new_expr, unitBag new_var) -zonkBind te ve EmptyBind = returnNF_Tc (EmptyBind, []) +zonkMonoBinds env (FunMonoBind var inf ms locn) + = zonkIdBndr env var `thenM` \ new_var -> + mappM (zonkMatch env) ms `thenM` \ new_ms -> + returnM (FunMonoBind new_var inf new_ms locn, unitBag new_var) -zonkBind te ve (NonRecBind mbinds) - = zonkMonoBinds te ve mbinds `thenNF_Tc` \ (new_mbinds, new_ids) -> - returnNF_Tc (NonRecBind new_mbinds, new_ids) -zonkBind te ve (RecBind mbinds) - = zonkMonoBinds te ve mbinds `thenNF_Tc` \ (new_mbinds, new_ids) -> - returnNF_Tc (RecBind new_mbinds, new_ids) +zonkMonoBinds env (AbsBinds tyvars dicts exports inlines val_bind) + = mappM zonkTcTyVarToTyVar tyvars `thenM` \ new_tyvars -> + -- No need to extend tyvar env: the effects are + -- propagated through binding the tyvars themselves -------------------------------------------------------------------------- -zonkMonoBinds :: TyVarEnv Type -> IdEnv Id - -> TcMonoBinds s -> NF_TcM s (TypecheckedMonoBinds, [Id]) - -zonkMonoBinds te ve EmptyMonoBinds = returnNF_Tc (EmptyMonoBinds, []) - -zonkMonoBinds te ve (AndMonoBinds mbinds1 mbinds2) - = zonkMonoBinds te ve mbinds1 `thenNF_Tc` \ (new_mbinds1, ids1) -> - zonkMonoBinds te ve mbinds2 `thenNF_Tc` \ (new_mbinds2, ids2) -> - returnNF_Tc (AndMonoBinds new_mbinds1 new_mbinds2, ids1 ++ ids2) - -zonkMonoBinds te ve (PatMonoBind pat grhss_w_binds locn) - = zonkPat te ve pat `thenNF_Tc` \ (new_pat, ids) -> - zonkGRHSsAndBinds te ve grhss_w_binds `thenNF_Tc` \ new_grhss_w_binds -> - returnNF_Tc (PatMonoBind new_pat new_grhss_w_binds locn, ids) - -zonkMonoBinds te ve (VarMonoBind var expr) - = zonkIdBndr te var `thenNF_Tc` \ new_var -> - zonkExpr te ve expr `thenNF_Tc` \ new_expr -> - returnNF_Tc (VarMonoBind new_var new_expr, [new_var]) - -zonkMonoBinds te ve (FunMonoBind var inf ms locn) - = zonkIdBndr te var `thenNF_Tc` \ new_var -> - mapNF_Tc (zonkMatch te ve) ms `thenNF_Tc` \ new_ms -> - returnNF_Tc (FunMonoBind new_var inf new_ms locn, [new_var]) + zonkIdBndrs env dicts `thenM` \ new_dicts -> + fixM (\ ~(_, _, val_bind_ids) -> + let + env1 = extendZonkEnv (extendZonkEnv env new_dicts) + (bagToList val_bind_ids) + 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) + where + zonkExport env (tyvars, global, local) + = zonkTcTyVars tyvars `thenM` \ tys -> + let + new_tyvars = map (tcGetTyVar "zonkExport") tys + -- This isn't the binding occurrence of these tyvars + -- but they should *be* tyvars. Hence tcGetTyVar. + in + zonkIdBndr env global `thenM` \ new_global -> + returnM (new_tyvars, new_global, zonkIdOcc env local) \end{code} %************************************************************************ %* * -\subsection[BackSubst-Match-GRHSs]{Match and GRHSsAndBinds} +\subsection[BackSubst-Match-GRHSs]{Match and GRHSs} %* * %************************************************************************ \begin{code} -zonkMatch :: TyVarEnv Type -> IdEnv Id - -> TcMatch s -> NF_TcM s TypecheckedMatch - -zonkMatch te ve (PatMatch pat match) - = zonkPat te ve pat `thenNF_Tc` \ (new_pat, ids) -> - let - new_ve = extend_ve ve ids - in - zonkMatch te new_ve match `thenNF_Tc` \ new_match -> - returnNF_Tc (PatMatch new_pat new_match) +zonkMatch :: ZonkEnv -> TcMatch -> TcM TypecheckedMatch -zonkMatch te ve (GRHSMatch grhss_w_binds) - = zonkGRHSsAndBinds te ve grhss_w_binds `thenNF_Tc` \ new_grhss_w_binds -> - returnNF_Tc (GRHSMatch new_grhss_w_binds) - -zonkMatch te ve (SimpleMatch expr) - = zonkExpr te ve expr `thenNF_Tc` \ new_expr -> - returnNF_Tc (SimpleMatch new_expr) +zonkMatch env (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) ------------------------------------------------------------------------- -zonkGRHSsAndBinds :: TyVarEnv Type -> IdEnv Id - -> TcGRHSsAndBinds s - -> NF_TcM s TypecheckedGRHSsAndBinds +zonkGRHSs :: ZonkEnv -> TcGRHSs -> TcM TypecheckedGRHSs -zonkGRHSsAndBinds te ve (GRHSsAndBindsOut grhss binds ty) - = zonkBinds te ve binds `thenNF_Tc` \ (new_binds, new_ve) -> +zonkGRHSs env (GRHSs grhss binds ty) + = zonkBinds env binds `thenM` \ (new_env, new_binds) -> let - zonk_grhs (GRHS guard expr locn) - = zonkExpr te new_ve guard `thenNF_Tc` \ new_guard -> - zonkExpr te new_ve expr `thenNF_Tc` \ new_expr -> - returnNF_Tc (GRHS new_guard new_expr locn) - - zonk_grhs (OtherwiseGRHS expr locn) - = zonkExpr te new_ve expr `thenNF_Tc` \ new_expr -> - returnNF_Tc (OtherwiseGRHS new_expr locn) + zonk_grhs (GRHS guarded locn) + = zonkStmts new_env guarded `thenM` \ new_guarded -> + returnM (GRHS new_guarded locn) in - mapNF_Tc zonk_grhs grhss `thenNF_Tc` \ new_grhss -> - zonkTcTypeToType te ty `thenNF_Tc` \ new_ty -> - returnNF_Tc (GRHSsAndBindsOut new_grhss new_binds new_ty) + mappM zonk_grhs grhss `thenM` \ new_grhss -> + zonkTcTypeToType env ty `thenM` \ new_ty -> + returnM (GRHSs new_grhss new_binds new_ty) \end{code} %************************************************************************ @@ -345,261 +426,276 @@ zonkGRHSsAndBinds te ve (GRHSsAndBindsOut grhss binds ty) %************************************************************************ \begin{code} -zonkExpr :: TyVarEnv Type -> IdEnv Id - -> TcExpr s -> NF_TcM s TypecheckedHsExpr - -zonkExpr te ve (HsVar name) - = returnNF_Tc (HsVar (zonkIdOcc ve name)) - -zonkExpr te ve (HsLit _) = panic "zonkExpr te ve:HsLit" - -zonkExpr te ve (HsLitOut lit ty) - = zonkTcTypeToType te ty `thenNF_Tc` \ new_ty -> - returnNF_Tc (HsLitOut lit new_ty) - -zonkExpr te ve (HsLam match) - = zonkMatch te ve match `thenNF_Tc` \ new_match -> - returnNF_Tc (HsLam new_match) - -zonkExpr te ve (HsApp e1 e2) - = zonkExpr te ve e1 `thenNF_Tc` \ new_e1 -> - zonkExpr te ve e2 `thenNF_Tc` \ new_e2 -> - returnNF_Tc (HsApp new_e1 new_e2) - -zonkExpr te ve (OpApp e1 op e2) - = zonkExpr te ve e1 `thenNF_Tc` \ new_e1 -> - zonkExpr te ve op `thenNF_Tc` \ new_op -> - zonkExpr te ve e2 `thenNF_Tc` \ new_e2 -> - returnNF_Tc (OpApp new_e1 new_op new_e2) - -zonkExpr te ve (NegApp _ _) = panic "zonkExpr te ve:NegApp" -zonkExpr te ve (HsPar _) = panic "zonkExpr te ve:HsPar" - -zonkExpr te ve (SectionL expr op) - = zonkExpr te ve expr `thenNF_Tc` \ new_expr -> - zonkExpr te ve op `thenNF_Tc` \ new_op -> - returnNF_Tc (SectionL new_expr new_op) - -zonkExpr te ve (SectionR op expr) - = zonkExpr te ve op `thenNF_Tc` \ new_op -> - zonkExpr te ve expr `thenNF_Tc` \ new_expr -> - returnNF_Tc (SectionR new_op new_expr) - -zonkExpr te ve (HsCase expr ms src_loc) - = zonkExpr te ve expr `thenNF_Tc` \ new_expr -> - mapNF_Tc (zonkMatch te ve) ms `thenNF_Tc` \ new_ms -> - returnNF_Tc (HsCase new_expr new_ms src_loc) - -zonkExpr te ve (HsIf e1 e2 e3 src_loc) - = zonkExpr te ve e1 `thenNF_Tc` \ new_e1 -> - zonkExpr te ve e2 `thenNF_Tc` \ new_e2 -> - zonkExpr te ve e3 `thenNF_Tc` \ new_e3 -> - returnNF_Tc (HsIf new_e1 new_e2 new_e3 src_loc) - -zonkExpr te ve (HsLet binds expr) - = zonkBinds te ve binds `thenNF_Tc` \ (new_binds, new_ve) -> - zonkExpr te new_ve expr `thenNF_Tc` \ new_expr -> - returnNF_Tc (HsLet new_binds new_expr) - -zonkExpr te ve (HsDo _ _) = panic "zonkExpr te ve:HsDo" - -zonkExpr te ve (HsDoOut stmts then_id zero_id src_loc) - = zonkStmts te ve stmts `thenNF_Tc` \ new_stmts -> - returnNF_Tc (HsDoOut new_stmts (zonkIdOcc ve then_id) (zonkIdOcc ve zero_id) src_loc) - -zonkExpr te ve (ListComp expr quals) - = zonkQuals te ve quals `thenNF_Tc` \ (new_quals, new_ve) -> - zonkExpr te new_ve expr `thenNF_Tc` \ new_expr -> - returnNF_Tc (ListComp new_expr new_quals) - -zonkExpr te ve (ExplicitList _) = panic "zonkExpr te ve:ExplicitList" - -zonkExpr te ve (ExplicitListOut ty exprs) - = zonkTcTypeToType te ty `thenNF_Tc` \ new_ty -> - mapNF_Tc (zonkExpr te ve) exprs `thenNF_Tc` \ new_exprs -> - returnNF_Tc (ExplicitListOut new_ty new_exprs) - -zonkExpr te ve (ExplicitTuple exprs) - = mapNF_Tc (zonkExpr te ve) exprs `thenNF_Tc` \ new_exprs -> - returnNF_Tc (ExplicitTuple new_exprs) - -zonkExpr te ve (RecordCon con rbinds) - = zonkExpr te ve con `thenNF_Tc` \ new_con -> - zonkRbinds te ve rbinds `thenNF_Tc` \ new_rbinds -> - returnNF_Tc (RecordCon new_con new_rbinds) - -zonkExpr te ve (RecordUpd _ _) = panic "zonkExpr te ve:RecordUpd" - -zonkExpr te ve (RecordUpdOut expr dicts rbinds) - = zonkExpr te ve expr `thenNF_Tc` \ new_expr -> - zonkRbinds te ve rbinds `thenNF_Tc` \ new_rbinds -> - returnNF_Tc (RecordUpdOut new_expr new_dicts new_rbinds) - where - new_dicts = map (zonkIdOcc ve) dicts +zonkExprs :: ZonkEnv -> [TcExpr] -> TcM [TypecheckedHsExpr] +zonkExpr :: ZonkEnv -> TcExpr -> TcM TypecheckedHsExpr -zonkExpr te ve (ExprWithTySig _ _) = panic "zonkExpr te ve:ExprWithTySig" -zonkExpr te ve (ArithSeqIn _) = panic "zonkExpr te ve:ArithSeqIn" +zonkExprs env exprs = mappM (zonkExpr env) exprs -zonkExpr te ve (ArithSeqOut expr info) - = zonkExpr te ve expr `thenNF_Tc` \ new_expr -> - zonkArithSeq te ve info `thenNF_Tc` \ new_info -> - returnNF_Tc (ArithSeqOut new_expr new_info) -zonkExpr te ve (CCall fun args may_gc is_casm result_ty) - = mapNF_Tc (zonkExpr te ve) args `thenNF_Tc` \ new_args -> - zonkTcTypeToType te result_ty `thenNF_Tc` \ new_result_ty -> - returnNF_Tc (CCall fun new_args may_gc is_casm new_result_ty) +zonkExpr env (HsVar id) + = returnM (HsVar (zonkIdOcc env id)) -zonkExpr te ve (HsSCC label expr) - = zonkExpr te ve expr `thenNF_Tc` \ new_expr -> - returnNF_Tc (HsSCC label new_expr) +zonkExpr env (HsIPVar id) + = returnM (HsIPVar (mapIPName (zonkIdOcc env) id)) -zonkExpr te ve (TyLam tyvars expr) - = mapNF_Tc zonkTcTyVarToTyVar tyvars `thenNF_Tc` \ new_tyvars -> - let - new_te = extend_te te new_tyvars - in - zonkExpr new_te ve expr `thenNF_Tc` \ new_expr -> - returnNF_Tc (TyLam new_tyvars new_expr) +zonkExpr env (HsLit (HsRat f ty)) + = zonkTcTypeToType env ty `thenM` \ new_ty -> + returnM (HsLit (HsRat f new_ty)) -zonkExpr te ve (TyApp expr tys) - = zonkExpr te ve expr `thenNF_Tc` \ new_expr -> - mapNF_Tc (zonkTcTypeToType te) tys `thenNF_Tc` \ new_tys -> - returnNF_Tc (TyApp new_expr new_tys) +zonkExpr env (HsLit (HsLitLit lit ty)) + = zonkTcTypeToType env ty `thenM` \ new_ty -> + returnM (HsLit (HsLitLit lit new_ty)) -zonkExpr te ve (DictLam dicts expr) - = mapNF_Tc (zonkIdBndr te) dicts `thenNF_Tc` \ new_dicts -> - let - new_ve = extend_ve ve new_dicts - in - zonkExpr te new_ve expr `thenNF_Tc` \ new_expr -> - returnNF_Tc (DictLam new_dicts new_expr) +zonkExpr env (HsLit lit) + = returnM (HsLit lit) -zonkExpr te ve (DictApp expr dicts) - = zonkExpr te ve expr `thenNF_Tc` \ new_expr -> - returnNF_Tc (DictApp new_expr new_dicts) - where - new_dicts = map (zonkIdOcc ve) dicts +-- HsOverLit doesn't appear in typechecker output -zonkExpr te ve (ClassDictLam dicts methods expr) - = zonkExpr te ve expr `thenNF_Tc` \ new_expr -> - returnNF_Tc (ClassDictLam new_dicts new_methods new_expr) - where - new_dicts = map (zonkIdOcc ve) dicts - new_methods = map (zonkIdOcc ve) methods - +zonkExpr env (HsLam match) + = zonkMatch env match `thenM` \ new_match -> + returnM (HsLam new_match) + +zonkExpr env (HsApp e1 e2) + = zonkExpr env e1 `thenM` \ new_e1 -> + zonkExpr env e2 `thenM` \ new_e2 -> + returnM (HsApp new_e1 new_e2) -zonkExpr te ve (Dictionary dicts methods) - = returnNF_Tc (Dictionary new_dicts new_methods) +zonkExpr env (HsBracketOut body bs) + = mappM zonk_b bs `thenM` \ bs' -> + returnM (HsBracketOut body bs') where - new_dicts = map (zonkIdOcc ve) dicts - new_methods = map (zonkIdOcc ve) methods + zonk_b (n,e) = zonkExpr env e `thenM` \ e' -> + returnM (n,e') + +zonkExpr env (HsReify r) = returnM (HsReify r) -- Nothing to zonk; only top + -- level things can be reified (for now) +zonkExpr env (HsSplice n e loc) = WARN( True, ppr e ) -- Should not happen + returnM (HsSplice n e loc) + +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 -> + 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 -> + returnM (HsPar new_e) + +zonkExpr env (SectionL expr op) + = zonkExpr env expr `thenM` \ new_expr -> + zonkExpr 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 -> + returnM (SectionR new_op new_expr) + +zonkExpr env (HsCase expr ms src_loc) + = zonkExpr env expr `thenM` \ new_expr -> + mappM (zonkMatch env) ms `thenM` \ new_ms -> + returnM (HsCase new_expr new_ms src_loc) + +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 (HsLet binds expr) + = zonkBinds env binds `thenM` \ (new_env, new_binds) -> + zonkExpr new_env expr `thenM` \ new_expr -> + returnM (HsLet new_binds new_expr) + +zonkExpr env (HsDo do_or_lc stmts ids ty src_loc) + = zonkStmts env stmts `thenM` \ new_stmts -> + zonkTcTypeToType env ty `thenM` \ new_ty -> + returnM (HsDo do_or_lc new_stmts + (zonkIdOccs env ids) + new_ty src_loc) + +zonkExpr env (ExplicitList ty exprs) + = zonkTcTypeToType env ty `thenM` \ new_ty -> + zonkExprs env exprs `thenM` \ new_exprs -> + returnM (ExplicitList new_ty new_exprs) + +zonkExpr env (ExplicitPArr ty exprs) + = zonkTcTypeToType env ty `thenM` \ new_ty -> + zonkExprs env exprs `thenM` \ new_exprs -> + returnM (ExplicitPArr new_ty new_exprs) + +zonkExpr env (ExplicitTuple exprs boxed) + = zonkExprs 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 -> + 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 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 (ExprWithTySig _ _) = panic "zonkExpr env:ExprWithTySig" +zonkExpr env (ArithSeqIn _) = panic "zonkExpr env:ArithSeqIn" +zonkExpr env (PArrSeqIn _) = panic "zonkExpr env:PArrSeqIn" + +zonkExpr env (ArithSeqOut expr info) + = zonkExpr 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 -> + zonkArithSeq env info `thenM` \ new_info -> + returnM (PArrSeqOut new_expr new_info) + +zonkExpr env (HsCCall fun args may_gc is_casm result_ty) + = zonkExprs env args `thenM` \ new_args -> + zonkTcTypeToType env 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 -> + returnM (HsSCC 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 -> + returnM (TyLam new_tyvars new_expr) + +zonkExpr env (TyApp expr tys) + = zonkExpr env expr `thenM` \ new_expr -> + mappM (zonkTcTypeToType env) tys `thenM` \ new_tys -> + returnM (TyApp new_expr new_tys) + +zonkExpr env (DictLam dicts expr) + = zonkIdBndrs env dicts `thenM` \ new_dicts -> + let + env1 = extendZonkEnv env new_dicts + in + zonkExpr env1 expr `thenM` \ new_expr -> + returnM (DictLam new_dicts new_expr) + +zonkExpr env (DictApp expr dicts) + = zonkExpr env expr `thenM` \ new_expr -> + returnM (DictApp new_expr (zonkIdOccs env dicts)) -zonkExpr te ve (SingleDict name) - = returnNF_Tc (SingleDict (zonkIdOcc ve name)) -zonkExpr te ve (HsCon con tys vargs) - = mapNF_Tc (zonkTcTypeToType te) tys `thenNF_Tc` \ new_tys -> - mapNF_Tc (zonkExpr te ve) vargs `thenNF_Tc` \ new_vargs -> - returnNF_Tc (HsCon con new_tys new_vargs) ------------------------------------------------------------------------- -zonkArithSeq :: TyVarEnv Type -> IdEnv Id - -> TcArithSeqInfo s -> NF_TcM s TypecheckedArithSeqInfo +zonkArithSeq :: ZonkEnv -> TcArithSeqInfo -> TcM TypecheckedArithSeqInfo -zonkArithSeq te ve (From e) - = zonkExpr te ve e `thenNF_Tc` \ new_e -> - returnNF_Tc (From new_e) +zonkArithSeq env (From e) + = zonkExpr env e `thenM` \ new_e -> + returnM (From new_e) -zonkArithSeq te ve (FromThen e1 e2) - = zonkExpr te ve e1 `thenNF_Tc` \ new_e1 -> - zonkExpr te ve e2 `thenNF_Tc` \ new_e2 -> - returnNF_Tc (FromThen new_e1 new_e2) +zonkArithSeq env (FromThen e1 e2) + = zonkExpr env e1 `thenM` \ new_e1 -> + zonkExpr env e2 `thenM` \ new_e2 -> + returnM (FromThen new_e1 new_e2) -zonkArithSeq te ve (FromTo e1 e2) - = zonkExpr te ve e1 `thenNF_Tc` \ new_e1 -> - zonkExpr te ve e2 `thenNF_Tc` \ new_e2 -> - returnNF_Tc (FromTo new_e1 new_e2) +zonkArithSeq env (FromTo e1 e2) + = zonkExpr env e1 `thenM` \ new_e1 -> + zonkExpr 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 -> + returnM (FromThenTo new_e1 new_e2 new_e3) -zonkArithSeq te ve (FromThenTo e1 e2 e3) - = zonkExpr te ve e1 `thenNF_Tc` \ new_e1 -> - zonkExpr te ve e2 `thenNF_Tc` \ new_e2 -> - zonkExpr te ve e3 `thenNF_Tc` \ new_e3 -> - returnNF_Tc (FromThenTo new_e1 new_e2 new_e3) ------------------------------------------------------------------------- -zonkQuals :: TyVarEnv Type -> IdEnv Id - -> [TcQual s] -> NF_TcM s ([TypecheckedQual], IdEnv Id) +zonkStmts :: ZonkEnv -> [TcStmt] -> TcM [TypecheckedStmt] -zonkQuals te ve [] - = returnNF_Tc ([], ve) +zonkStmts env stmts = zonk_stmts env stmts `thenM` \ (_, stmts) -> + returnM stmts -zonkQuals te ve (GeneratorQual pat expr : quals) - = zonkPat te ve pat `thenNF_Tc` \ (new_pat, ids) -> - zonkExpr te ve expr `thenNF_Tc` \ new_expr -> - let - new_ve = extend_ve ve ids - in - zonkQuals te new_ve quals `thenNF_Tc` \ (new_quals, final_ve) -> - returnNF_Tc (GeneratorQual new_pat new_expr : new_quals, final_ve) +zonk_stmts :: ZonkEnv -> [TcStmt] -> TcM (ZonkEnv, [TypecheckedStmt]) -zonkQuals te ve (FilterQual expr : quals) - = zonkExpr te ve expr `thenNF_Tc` \ new_expr -> - zonkQuals te ve quals `thenNF_Tc` \ (new_quals, final_ve) -> - returnNF_Tc (FilterQual new_expr : new_quals, final_ve) +zonk_stmts env [] = returnM (env, []) -zonkQuals te ve (LetQual binds : quals) - = zonkBinds te ve binds `thenNF_Tc` \ (new_binds, new_ve) -> - zonkQuals te new_ve quals `thenNF_Tc` \ (new_quals, final_ve) -> - returnNF_Tc (LetQual new_binds : new_quals, final_ve) +zonk_stmts env (ParStmtOut bndrstmtss : stmts) + = mappM (mappM zonkId) bndrss `thenM` \ new_bndrss -> + mappM (zonkStmts env) stmtss `thenM` \ new_stmtss -> + let + new_binders = concat new_bndrss + env1 = extendZonkEnv env new_binders + in + zonk_stmts env1 stmts `thenM` \ (env2, new_stmts) -> + returnM (env2, ParStmtOut (zip new_bndrss new_stmtss) : new_stmts) + where + (bndrss, stmtss) = unzip bndrstmtss -------------------------------------------------------------------------- -zonkStmts :: TyVarEnv Type -> IdEnv Id - -> [TcStmt s] -> NF_TcM s [TypecheckedStmt] - -zonkStmts te ve [] = returnNF_Tc [] - -zonkStmts te ve [ExprStmt expr locn] - = zonkExpr te ve expr `thenNF_Tc` \ new_expr -> - returnNF_Tc [ExprStmt new_expr locn] - -zonkStmts te ve (ExprStmtOut expr locn a b : stmts) - = zonkExpr te ve expr `thenNF_Tc` \ new_expr -> - zonkTcTypeToType te a `thenNF_Tc` \ new_a -> - zonkTcTypeToType te b `thenNF_Tc` \ new_b -> - zonkStmts te ve stmts `thenNF_Tc` \ new_stmts -> - returnNF_Tc (ExprStmtOut new_expr locn new_a new_b : new_stmts) - -zonkStmts te ve (LetStmt binds : stmts) - = zonkBinds te ve binds `thenNF_Tc` \ (new_binds, new_ve) -> - zonkStmts te new_ve stmts `thenNF_Tc` \ new_stmts -> - returnNF_Tc (LetStmt new_binds : new_stmts) - -zonkStmts te ve (BindStmtOut pat expr locn a b : stmts) - = zonkPat te ve pat `thenNF_Tc` \ (new_pat, ids) -> - zonkExpr te ve expr `thenNF_Tc` \ new_expr -> - zonkTcTypeToType te a `thenNF_Tc` \ new_a -> - zonkTcTypeToType te b `thenNF_Tc` \ new_b -> +zonk_stmts env (RecStmt vs segStmts rets : stmts) + = mappM zonkId vs `thenM` \ new_vs -> let - new_ve = extend_ve ve ids + env1 = extendZonkEnv env new_vs in - zonkStmts te new_ve stmts `thenNF_Tc` \ new_stmts -> - returnNF_Tc (BindStmtOut new_pat new_expr locn new_a new_b : new_stmts) + zonk_stmts env1 segStmts `thenM` \ (env2, new_segStmts) -> + -- Zonk the ret-expressions in an envt that + -- has the polymorphic bindings in the envt + zonkExprs env2 rets `thenM` \ new_rets -> + zonk_stmts env1 stmts `thenM` \ (env3, new_stmts) -> + returnM (env3, RecStmt new_vs new_segStmts new_rets : new_stmts) + +zonk_stmts env (ResultStmt expr locn : stmts) + = ASSERT( null stmts ) + zonkExpr env expr `thenM` \ new_expr -> + returnM (env, [ResultStmt new_expr locn]) + +zonk_stmts env (ExprStmt expr ty locn : stmts) + = zonkExpr env expr `thenM` \ new_expr -> + zonkTcTypeToType env ty `thenM` \ new_ty -> + zonk_stmts env stmts `thenM` \ (env1, new_stmts) -> + returnM (env1, ExprStmt new_expr new_ty locn : new_stmts) + +zonk_stmts env (LetStmt binds : stmts) + = zonkBinds env binds `thenM` \ (env1, new_binds) -> + zonk_stmts env1 stmts `thenM` \ (env2, new_stmts) -> + returnM (env2, LetStmt new_binds : new_stmts) + +zonk_stmts env (BindStmt pat expr locn : stmts) + = zonkExpr env expr `thenM` \ new_expr -> + zonkPat env pat `thenM` \ (new_pat, new_ids) -> + let + env1 = extendZonkEnv env (bagToList new_ids) + in + zonk_stmts env1 stmts `thenM` \ (env2, new_stmts) -> + returnM (env2, BindStmt new_pat new_expr locn : new_stmts) ------------------------------------------------------------------------- -zonkRbinds :: TyVarEnv Type -> IdEnv Id - -> TcRecordBinds s -> NF_TcM s TypecheckedRecordBinds +zonkRbinds :: ZonkEnv -> TcRecordBinds -> TcM TypecheckedRecordBinds -zonkRbinds te ve rbinds - = mapNF_Tc zonk_rbind rbinds +zonkRbinds env rbinds + = mappM zonk_rbind rbinds where - zonk_rbind (field, expr, pun) - = zonkExpr te ve expr `thenNF_Tc` \ new_expr -> - returnNF_Tc (zonkIdOcc ve field, new_expr, pun) + zonk_rbind (field, expr) + = zonkExpr env expr `thenM` \ new_expr -> + returnM (zonkIdOcc env field, new_expr) + +------------------------------------------------------------------------- +mapIPNameTc :: (a -> TcM b) -> IPName a -> TcM (IPName b) +mapIPNameTc f (Dupable n) = f n `thenM` \ r -> returnM (Dupable r) +mapIPNameTc f (Linear n) = f n `thenM` \ r -> returnM (Linear r) \end{code} + %************************************************************************ %* * \subsection[BackSubst-Pats]{Patterns} @@ -607,77 +703,259 @@ zonkRbinds te ve rbinds %************************************************************************ \begin{code} -zonkPat :: TyVarEnv Type -> IdEnv Id - -> TcPat s -> NF_TcM s (TypecheckedPat, [Id]) - -zonkPat te ve (WildPat ty) - = zonkTcTypeToType te ty `thenNF_Tc` \ new_ty -> - returnNF_Tc (WildPat new_ty, []) - -zonkPat te ve (VarPat v) - = zonkIdBndr te v `thenNF_Tc` \ new_v -> - returnNF_Tc (VarPat new_v, [new_v]) - -zonkPat te ve (LazyPat pat) - = zonkPat te ve pat `thenNF_Tc` \ (new_pat, ids) -> - returnNF_Tc (LazyPat new_pat, ids) - -zonkPat te ve (AsPat n pat) - = zonkIdBndr te n `thenNF_Tc` \ new_n -> - zonkPat te ve pat `thenNF_Tc` \ (new_pat, ids) -> - returnNF_Tc (AsPat new_n new_pat, new_n:ids) - -zonkPat te ve (ConPat n ty pats) - = zonkTcTypeToType te ty `thenNF_Tc` \ new_ty -> - zonkPats te ve pats `thenNF_Tc` \ (new_pats, ids) -> - returnNF_Tc (ConPat n new_ty new_pats, ids) - -zonkPat te ve (ConOpPat pat1 op pat2 ty) - = zonkPat te ve pat1 `thenNF_Tc` \ (new_pat1, ids1) -> - zonkPat te ve pat2 `thenNF_Tc` \ (new_pat2, ids2) -> - zonkTcTypeToType te ty `thenNF_Tc` \ new_ty -> - returnNF_Tc (ConOpPat new_pat1 op new_pat2 new_ty, ids1 ++ ids2) - -zonkPat te ve (ListPat ty pats) - = zonkTcTypeToType te ty `thenNF_Tc` \ new_ty -> - zonkPats te ve pats `thenNF_Tc` \ (new_pats, ids) -> - returnNF_Tc (ListPat new_ty new_pats, ids) - -zonkPat te ve (TuplePat pats) - = zonkPats te ve pats `thenNF_Tc` \ (new_pats, ids) -> - returnNF_Tc (TuplePat new_pats, ids) - -zonkPat te ve (RecPat n ty rpats) - = zonkTcTypeToType te ty `thenNF_Tc` \ new_ty -> - mapAndUnzipNF_Tc zonk_rpat rpats `thenNF_Tc` \ (new_rpats, ids_s) -> - returnNF_Tc (RecPat n new_ty new_rpats, concat ids_s) +zonkPat :: ZonkEnv -> TcPat -> TcM (TypecheckedPat, Bag Id) + +zonkPat env (ParPat p) + = zonkPat env p `thenM` \ (new_p, ids) -> + returnM (ParPat new_p, ids) + +zonkPat env (WildPat ty) + = zonkTcTypeToType env ty `thenM` \ new_ty -> + returnM (WildPat new_ty, emptyBag) + +zonkPat env (VarPat v) + = zonkIdBndr env v `thenM` \ new_v -> + returnM (VarPat new_v, unitBag new_v) + +zonkPat env (LazyPat pat) + = zonkPat env pat `thenM` \ (new_pat, ids) -> + returnM (LazyPat new_pat, ids) + +zonkPat env (AsPat n pat) + = zonkIdBndr env n `thenM` \ new_n -> + zonkPat env pat `thenM` \ (new_pat, ids) -> + returnM (AsPat new_n new_pat, new_n `consBag` ids) + +zonkPat 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 env ty `thenM` \ new_ty -> + zonkPats env pats `thenM` \ (new_pats, ids) -> + returnM (PArrPat new_pats new_ty, ids) + +zonkPat 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 env ty `thenM` \ new_ty -> + mappM zonkTcTyVarToTyVar tvs `thenM` \ new_tvs -> + zonkIdBndrs env dicts `thenM` \ new_dicts -> + let + env1 = extendZonkEnv env new_dicts + in + zonkConStuff env 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) + +zonkPat 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 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 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) + +zonkPat 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) + +--------------------------- +zonkConStuff env (PrefixCon pats) + = zonkPats env pats `thenM` \ (new_pats, ids) -> + returnM (PrefixCon new_pats, ids) + +zonkConStuff env (InfixCon p1 p2) + = zonkPat env p1 `thenM` \ (new_p1, ids1) -> + zonkPat env p2 `thenM` \ (new_p2, ids2) -> + returnM (InfixCon new_p1 new_p2, ids1 `unionBags` ids2) + +zonkConStuff env (RecCon rpats) + = mapAndUnzipM zonk_rpat rpats `thenM` \ (new_rpats, ids_s) -> + returnM (RecCon new_rpats, unionManyBags ids_s) where - zonk_rpat (f, pat, pun) - = zonkPat te ve pat `thenNF_Tc` \ (new_pat, ids) -> - returnNF_Tc ((f, new_pat, pun), ids) + zonk_rpat (f, pat) + = zonkPat env pat `thenM` \ (new_pat, ids) -> + returnM ((f, new_pat), ids) + +--------------------------- +zonkPats env [] + = returnM ([], emptyBag) + +zonkPats env (pat:pats) + = zonkPat env pat `thenM` \ (pat', ids1) -> + zonkPats env pats `thenM` \ (pats', ids2) -> + returnM (pat':pats', ids1 `unionBags` ids2) +\end{code} + +%************************************************************************ +%* * +\subsection[BackSubst-Foreign]{Foreign exports} +%* * +%************************************************************************ -zonkPat te ve (LitPat lit ty) - = zonkTcTypeToType te ty `thenNF_Tc` \ new_ty -> - returnNF_Tc (LitPat lit new_ty, []) -zonkPat te ve (NPat lit ty expr) - = zonkTcTypeToType te ty `thenNF_Tc` \ new_ty -> - zonkExpr te ve expr `thenNF_Tc` \ new_expr -> - returnNF_Tc (NPat lit new_ty new_expr, []) +\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) +zonkForeignExport env for_imp + = returnM for_imp -- Foreign imports don't need zonking +\end{code} -zonkPat te ve (DictPat ds ms) - = mapNF_Tc (zonkIdBndr te) ds `thenNF_Tc` \ new_ds -> - mapNF_Tc (zonkIdBndr te) ms `thenNF_Tc` \ new_ms -> - returnNF_Tc (DictPat new_ds new_ms, new_ds ++ new_ms) +\begin{code} +zonkRules :: ZonkEnv -> [TcRuleDecl] -> TcM [TypecheckedRuleDecl] +zonkRules env rs = mappM (zonkRule env) rs +zonkRule env (HsRule name act vars lhs rhs loc) + = mappM zonk_bndr vars `thenM` \ new_bndrs -> + newMutVar emptyVarSet `thenM` \ unbound_tv_set -> + let + env_rhs = extendZonkEnv env (filter isId new_bndrs) + -- 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 env_lhs lhs `thenM` \ new_lhs -> + zonkExpr env_rhs rhs `thenM` \ new_rhs -> -zonkPats te ve [] - = returnNF_Tc ([], []) -zonkPats te ve (pat:pats) - = zonkPat te ve pat `thenNF_Tc` \ (pat', ids1) -> - zonkPats te ve pats `thenNF_Tc` \ (pats', ids2) -> - returnNF_Tc (pat':pats', ids1 ++ ids2) + readMutVar unbound_tv_set `thenM` \ unbound_tvs -> + let + final_bndrs = map RuleBndr (varSetElems unbound_tvs ++ new_bndrs) + -- I hate this map RuleBndr stuff + in + returnM (HsRule name act final_bndrs new_lhs new_rhs loc) + where + zonk_bndr (RuleBndr v) + | isId v = zonkIdBndr env v + | otherwise = zonkTcTyVarToTyVar v +zonkRule env (IfaceRuleOut fun rule) + = returnM (IfaceRuleOut (zonkIdOcc env fun) rule) \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}