X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=ghc%2Fcompiler%2Ftypecheck%2FTcSplice.lhs;h=beb72f193278b25f81b006e010c6ccf178a18739;hb=ac10f8408520a30e8437496d320b8b86afda2e8f;hp=f4039273fb639fac4fb52d8a988740d388acf4eb;hpb=ef5b4b146aa172d8ac10f39b5eb3d7a0f948d8f1;p=ghc-hetmet.git diff --git a/ghc/compiler/typecheck/TcSplice.lhs b/ghc/compiler/typecheck/TcSplice.lhs index f403927..beb72f1 100644 --- a/ghc/compiler/typecheck/TcSplice.lhs +++ b/ghc/compiler/typecheck/TcSplice.lhs @@ -19,33 +19,35 @@ import qualified Language.Haskell.TH.Syntax as TH import HsSyn ( HsBracket(..), HsExpr(..), HsSplice(..), LHsExpr, LHsDecl, HsType, LHsType ) -import Convert ( convertToHsExpr, convertToHsDecls, convertToHsType ) +import Convert ( convertToHsExpr, convertToHsDecls, convertToHsType, thRdrName ) import RnExpr ( rnLExpr ) -import RnEnv ( lookupFixityRn, lookupSrcOcc_maybe ) -import RdrName ( RdrName, mkRdrUnqual, lookupLocalRdrEnv ) +import RnEnv ( lookupFixityRn, lookupSrcOcc_maybe, lookupImportedName ) +import RdrName ( RdrName, lookupLocalRdrEnv, isSrcRdrName ) import RnTypes ( rnLHsType ) -import TcExpr ( tcCheckRho, tcMonoExpr ) -import TcHsSyn ( mkHsLet, zonkTopLExpr ) +import TcExpr ( tcMonoExpr ) +import TcHsSyn ( mkHsDictLet, zonkTopLExpr ) import TcSimplify ( tcSimplifyTop, tcSimplifyBracket ) -import TcUnify ( Expected, zapExpectedTo, zapExpectedType ) -import TcType ( TcType, TcKind, liftedTypeKind, mkAppTy, tcSplitSigmaTy ) +import TcUnify ( boxyUnify, unBox ) +import TcType ( TcType, TcKind, BoxyRhoType, liftedTypeKind, mkAppTy, tcSplitSigmaTy ) import TcEnv ( spliceOK, tcMetaTy, bracketOK ) -import TcMType ( newTyFlexiVarTy, newKindVar, UserTypeCtxt(ExprSigCtxt), zonkTcType, zonkTcTyVar ) +import TcMType ( newFlexiTyVarTy, newKindVar, UserTypeCtxt(ExprSigCtxt), zonkTcType ) import TcHsType ( tcHsSigType, kcHsType ) import TcIface ( tcImportDecl ) import TypeRep ( Type(..), PredType(..), TyThing(..) ) -- For reification +import PrelNames ( thFAKE ) import Name ( Name, NamedThing(..), nameOccName, nameModule, isExternalName, - mkInternalName, nameIsLocalOrFrom ) + nameIsLocalOrFrom ) import NameEnv ( lookupNameEnv ) -import HscTypes ( lookupType, ExternalPackageState(..) ) +import HscTypes ( lookupType, ExternalPackageState(..), emptyModDetails ) import OccName import Var ( Id, TyVar, idType ) -import Module ( moduleUserString, mkModule ) +import Module ( moduleString ) import TcRnMonad import IfaceEnv ( lookupOrig ) import Class ( Class, classExtraBigSig ) -import TyCon ( TyCon, AlgTyConRhs(..), tyConTyVars, getSynTyConDefn, - isSynTyCon, isNewTyCon, tyConDataCons, algTyConRhs ) +import TyCon ( TyCon, tyConTyVars, synTyConDefn, + isSynTyCon, isNewTyCon, tyConDataCons, isPrimTyCon, isFunTyCon, + tyConArity, tyConStupidTheta, isUnLiftedTyCon ) import DataCon ( DataCon, dataConTyCon, dataConOrigArgTys, dataConStrictMarks, dataConName, dataConFieldLabels, dataConWrapId, dataConIsInfix, isVanillaDataCon ) @@ -54,7 +56,7 @@ import IdInfo ( GlobalIdDetails(..) ) import TysWiredIn ( mkListTy ) import DsMeta ( expQTyConName, typeQTyConName, decTyConName, qTyConName, nameTyConName ) import ErrUtils ( Message ) -import SrcLoc ( noLoc, unLoc, getLoc, noSrcLoc ) +import SrcLoc ( SrcSpan, noLoc, unLoc, getLoc ) import Outputable import Unique ( Unique, Uniquable(..), getKey, mkUniqueGrimily ) @@ -64,7 +66,6 @@ import FastString ( LitString ) import GHC.Base ( unsafeCoerce#, Int#, Int(..) ) -- Should have a better home in the module hierarchy import Monad ( liftM ) -import Maybes ( orElse ) #ifdef GHCI import FastString ( mkFastString ) @@ -80,7 +81,7 @@ import FastString ( mkFastString ) \begin{code} tcSpliceDecls :: LHsExpr Name -> TcM [LHsDecl RdrName] -tcSpliceExpr :: HsSplice Name -> Expected TcType -> TcM (HsExpr TcId) +tcSpliceExpr :: HsSplice Name -> BoxyRhoType -> TcM (HsExpr TcId) kcSpliceType :: HsSplice Name -> TcM (HsType Name, TcKind) #ifndef GHCI @@ -96,7 +97,7 @@ tcSpliceDecls e = pprPanic "Cant do tcSpliceDecls without GHCi" (ppr e) %************************************************************************ \begin{code} -tcBracket :: HsBracket Name -> Expected TcType -> TcM (LHsExpr Id) +tcBracket :: HsBracket Name -> BoxyRhoType -> TcM (LHsExpr Id) tcBracket brack res_ty = getStage `thenM` \ level -> case bracketOK level of { @@ -116,7 +117,7 @@ tcBracket brack res_ty tcSimplifyBracket lie `thenM_` -- Make the expected type have the right shape - zapExpectedTo res_ty meta_ty `thenM_` + boxyUnify meta_ty res_ty `thenM_` -- Return the original expression, not the type-decorated one readMutVar pending_splices `thenM` \ pendings -> @@ -125,12 +126,11 @@ tcBracket brack res_ty tc_bracket :: HsBracket Name -> TcM TcType tc_bracket (VarBr v) - = tcMetaTy nameTyConName - -- Result type is Var (not Q-monadic) + = tcMetaTy nameTyConName -- Result type is Var (not Q-monadic) tc_bracket (ExpBr expr) - = newTyFlexiVarTy liftedTypeKind `thenM` \ any_ty -> - tcCheckRho expr any_ty `thenM_` + = newFlexiTyVarTy liftedTypeKind `thenM` \ any_ty -> + tcMonoExpr expr any_ty `thenM_` tcMetaTy expQTyConName -- Result type is Expr (= Q Exp) @@ -140,14 +140,18 @@ tc_bracket (TypBr typ) -- Result type is Type (= Q Typ) tc_bracket (DecBr decls) - = tcTopSrcDecls [{- no boot-names -}] decls `thenM_` + = do { tcTopSrcDecls emptyModDetails decls -- Typecheck the declarations, dicarding the result -- We'll get all that stuff later, when we splice it in - tcMetaTy decTyConName `thenM` \ decl_ty -> - tcMetaTy qTyConName `thenM` \ q_ty -> - returnM (mkAppTy q_ty (mkListTy decl_ty)) + ; decl_ty <- tcMetaTy decTyConName + ; q_ty <- tcMetaTy qTyConName + ; return (mkAppTy q_ty (mkListTy decl_ty)) -- Result type is Q [Dec] + } + +tc_bracket (PatBr _) + = failWithTc (ptext SLIT("Tempate Haskell pattern brackets are not supported yet")) \end{code} @@ -176,11 +180,11 @@ tcSpliceExpr (HsSplice name expr) res_ty -- Here (h 4) :: Q Exp -- but $(h 4) :: forall a.a i.e. anything! - zapExpectedType res_ty liftedTypeKind `thenM_` + unBox res_ty `thenM_` tcMetaTy expQTyConName `thenM` \ meta_exp_ty -> setStage (Splice next_level) ( setLIEVar lie_var $ - tcCheckRho expr meta_exp_ty + tcMonoExpr expr meta_exp_ty ) `thenM` \ expr' -> -- Write the pending splice into the bucket @@ -197,7 +201,7 @@ tcSpliceExpr (HsSplice name expr) res_ty -- The recursive call to tcMonoExpr will simply expand the -- inner escape before dealing with the outer one -tcTopSplice :: LHsExpr Name -> Expected TcType -> TcM (LHsExpr Id) +tcTopSplice :: LHsExpr Name -> BoxyRhoType -> TcM (LHsExpr Id) tcTopSplice expr res_ty = tcMetaTy expQTyConName `thenM` \ meta_exp_ty -> @@ -206,14 +210,8 @@ tcTopSplice expr res_ty -- Run the expression traceTc (text "About to run" <+> ppr zonked_q_expr) `thenM_` - runMetaE zonked_q_expr `thenM` \ simple_expr -> + runMetaE convertToHsExpr zonked_q_expr `thenM` \ expr2 -> - let - -- simple_expr :: TH.Exp - - expr2 :: LHsExpr RdrName - expr2 = convertToHsExpr simple_expr - in traceTc (text "Got result" <+> ppr expr2) `thenM_` showSplice "expression" @@ -239,13 +237,13 @@ tcTopSpliceExpr expr meta_ty do { recordThUse -- Record that TH is used (for pkg depdendency) -- Typecheck the expression - ; (expr', lie) <- getLIE (tcCheckRho expr meta_ty) + ; (expr', lie) <- getLIE (tcMonoExpr expr meta_ty) -- Solve the constraints ; const_binds <- tcSimplifyTop lie -- And zonk it - ; zonkTopLExpr (mkHsLet const_binds expr') } + ; zonkTopLExpr (mkHsDictLet const_binds expr') } \end{code} @@ -274,7 +272,7 @@ kcSpliceType (HsSplice name hs_expr) ; meta_ty <- tcMetaTy typeQTyConName ; expr' <- setStage (Splice next_level) $ setLIEVar lie_var $ - tcCheckRho hs_expr meta_ty + tcMonoExpr hs_expr meta_ty -- Write the pending splice into the bucket ; ps <- readMutVar ps_var @@ -296,12 +294,8 @@ kcTopSpliceType expr -- Run the expression ; traceTc (text "About to run" <+> ppr zonked_q_expr) - ; simple_ty <- runMetaT zonked_q_expr + ; hs_ty2 <- runMetaT convertToHsType zonked_q_expr - ; let -- simple_ty :: TH.Type - hs_ty2 :: LHsType RdrName - hs_ty2 = convertToHsType simple_ty - ; traceTc (text "Got result" <+> ppr hs_ty2) ; showSplice "type" zonked_q_expr (ppr hs_ty2) @@ -322,6 +316,8 @@ kcTopSpliceType expr \begin{code} -- Always at top level +-- Type sig at top of file: +-- tcSpliceDecls :: LHsExpr Name -> TcM [LHsDecl RdrName] tcSpliceDecls expr = do { meta_dec_ty <- tcMetaTy decTyConName ; meta_q_ty <- tcMetaTy qTyConName @@ -330,14 +326,12 @@ tcSpliceDecls expr -- Run the expression ; traceTc (text "About to run" <+> ppr zonked_q_expr) - ; simple_expr <- runMetaD zonked_q_expr + ; decls <- runMetaD convertToHsDecls zonked_q_expr - -- simple_expr :: [TH.Dec] - -- decls :: [RdrNameHsDecl] - ; decls <- handleErrors (convertToHsDecls simple_expr) ; traceTc (text "Got result" <+> vcat (map ppr decls)) ; showSplice "declarations" - zonked_q_expr (vcat (map ppr decls)) + zonked_q_expr + (ppr (getLoc expr) $$ (vcat (map ppr decls))) ; returnM decls } where handleErrors :: [Either a Message] -> TcM [a] @@ -355,42 +349,63 @@ tcSpliceDecls expr %************************************************************************ \begin{code} -runMetaE :: LHsExpr Id -- Of type (Q Exp) - -> TcM TH.Exp -- Of type Exp -runMetaE e = runMeta e - -runMetaT :: LHsExpr Id -- Of type (Q Type) - -> TcM TH.Type -- Of type Type -runMetaT e = runMeta e - -runMetaD :: LHsExpr Id -- Of type Q [Dec] - -> TcM [TH.Dec] -- Of type [Dec] -runMetaD e = runMeta e - -runMeta :: LHsExpr Id -- Of type X - -> TcM t -- Of type t -runMeta expr +runMetaE :: (SrcSpan -> TH.Exp -> Either Message (LHsExpr RdrName)) + -> LHsExpr Id -- Of type (Q Exp) + -> TcM (LHsExpr RdrName) +runMetaE = runMeta + +runMetaT :: (SrcSpan -> TH.Type -> Either Message (LHsType RdrName)) + -> LHsExpr Id -- Of type (Q Type) + -> TcM (LHsType RdrName) +runMetaT = runMeta + +runMetaD :: (SrcSpan -> [TH.Dec] -> Either Message [LHsDecl RdrName]) + -> LHsExpr Id -- Of type Q [Dec] + -> TcM [LHsDecl RdrName] +runMetaD = runMeta + +runMeta :: (SrcSpan -> th_syn -> Either Message hs_syn) + -> LHsExpr Id -- Of type X + -> TcM hs_syn -- Of type t +runMeta convert expr = do { hsc_env <- getTopEnv ; tcg_env <- getGblEnv ; this_mod <- getModule ; let type_env = tcg_type_env tcg_env rdr_env = tcg_rdr_env tcg_env - -- Wrap the compile-and-run in an exception-catcher - -- Compiling might fail if linking fails - -- Running might fail if it throws an exception - ; either_tval <- tryM $ do - { -- Compile it - hval <- ioToTcRn (HscMain.compileExpr + + -- Compile and link it; might fail if linking fails + ; either_hval <- tryM $ ioToTcRn $ + HscMain.compileExpr hsc_env this_mod - rdr_env type_env expr) - -- Coerce it to Q t, and run it - ; TH.runQ (unsafeCoerce# hval) } + rdr_env type_env expr + ; case either_hval of { + Left exn -> failWithTc (mk_msg "compile and link" exn) ; + Right hval -> do + + { -- Coerce it to Q t, and run it + -- Running might fail if it throws an exception of any kind (hence tryAllM) + -- including, say, a pattern-match exception in the code we are running + -- + -- We also do the TH -> HS syntax conversion inside the same + -- exception-cacthing thing so that if there are any lurking + -- exceptions in the data structure returned by hval, we'll + -- encounter them inside the tryALlM + either_tval <- tryAllM $ do + { th_syn <- TH.runQ (unsafeCoerce# hval) + ; case convert (getLoc expr) th_syn of + Left err -> do { addErrTc err; return Nothing } + Right hs_syn -> return (Just hs_syn) } ; case either_tval of - Left exn -> failWithTc (vcat [text "Exception when trying to run compile-time code:", - nest 4 (vcat [text "Code:" <+> ppr expr, - text ("Exn: " ++ Panic.showException exn)])]) - Right v -> returnM v } + Right (Just v) -> return v + Right Nothing -> failM -- Error already in Tc monad + Left exn -> failWithTc (mk_msg "run" exn) -- Exception + }}} + where + mk_msg s exn = vcat [text "Exception when trying to" <+> text s <+> text "compile-time code:", + nest 2 (text (Panic.showException exn)), + nest 2 (text "Code:" <+> ppr expr)] \end{code} To call runQ in the Tc monad, we need to make TcM an instance of Quasi: @@ -404,7 +419,7 @@ instance TH.Quasi (IOEnv (Env TcGblEnv TcLclEnv)) where qReport True msg = addErr (text msg) qReport False msg = addReport (text msg) - qCurrentModule = do { m <- getModule; return (moduleUserString m) } + qCurrentModule = do { m <- getModule; return (moduleString m) } qReify v = reify v qRecover = recoverM @@ -451,41 +466,37 @@ reify th_name ; thing <- tcLookupTh name -- ToDo: this tcLookup could fail, which would give a -- rather unhelpful error message + ; traceIf (text "reify" <+> text (show th_name) <+> brackets (ppr_ns th_name) <+> ppr name) ; reifyThing thing } + where + ppr_ns (TH.Name _ (TH.NameG TH.DataName mod)) = text "data" + ppr_ns (TH.Name _ (TH.NameG TH.TcClsName mod)) = text "tc" + ppr_ns (TH.Name _ (TH.NameG TH.VarName mod)) = text "var" lookupThName :: TH.Name -> TcM Name -lookupThName (TH.Name occ (TH.NameG th_ns mod)) - = lookupOrig (mkModule (TH.modString mod)) - (OccName.mkOccName ghc_ns (TH.occString occ)) - where - ghc_ns = case th_ns of - TH.DataName -> dataName - TH.TcClsName -> tcClsName - TH.VarName -> varName +lookupThName th_name@(TH.Name occ flavour) + = do { let rdr_name = thRdrName guessed_ns occ_str flavour -lookupThName th_name@(TH.Name occ TH.NameS) - = do { let rdr_name = mkRdrUnqual (OccName.mkOccFS ns occ_fs) + -- Repeat much of lookupOccRn, becase we want + -- to report errors in a TH-relevant way ; rdr_env <- getLocalRdrEnv ; case lookupLocalRdrEnv rdr_env rdr_name of - Just name -> return name - Nothing -> do - { mb_name <- lookupSrcOcc_maybe rdr_name - ; case mb_name of - Just name -> return name ; - Nothing -> failWithTc (notInScope th_name) - }} + Just name -> return name + Nothing | not (isSrcRdrName rdr_name) -- Exact, Orig + -> lookupImportedName rdr_name + | otherwise -- Unqual, Qual + -> do { + mb_name <- lookupSrcOcc_maybe rdr_name + ; case mb_name of + Just name -> return name + Nothing -> failWithTc (notInScope th_name) } + } where - ns | isLexCon occ_fs = OccName.dataName - | otherwise = OccName.varName - occ_fs = mkFastString (TH.occString occ) - -lookupThName (TH.Name occ (TH.NameU uniq)) - = return (mkInternalName (mk_uniq uniq) (OccName.mkOccFS bogus_ns occ_fs) noSrcLoc) - where - occ_fs = mkFastString (TH.occString occ) - bogus_ns = OccName.varName -- Not yet recorded in the TH name - -- but only the unique matters + -- guessed_ns is the name space guessed from looking at the TH name + guessed_ns | isLexCon (mkFastString occ_str) = OccName.dataName + | otherwise = OccName.varName + occ_str = TH.occString occ tcLookupTh :: Name -> TcM TcTyThing -- This is a specialised version of TcEnv.tcLookup; specialised mainly in that @@ -493,8 +504,8 @@ tcLookupTh :: Name -> TcM TcTyThing -- tcLookup, failure is a bug. tcLookupTh name = do { (gbl_env, lcl_env) <- getEnvs - ; case lookupNameEnv (tcl_env lcl_env) name of - Just thing -> returnM thing + ; case lookupNameEnv (tcl_env lcl_env) name of { + Just thing -> returnM thing; Nothing -> do { if nameIsLocalOrFrom (tcg_mod gbl_env) name then -- It's defined in this module @@ -506,15 +517,11 @@ tcLookupTh name { (eps,hpt) <- getEpsAndHpt ; case lookupType hpt (eps_PTE eps) name of Just thing -> return (AGlobal thing) - Nothing -> do { traceIf (text "tcLookupGlobal" <+> ppr name) - ; thing <- initIfaceTcRn (tcImportDecl name) + Nothing -> do { thing <- tcImportDecl name ; return (AGlobal thing) } -- Imported names should always be findable; -- if not, we fail hard in tcImportDecl - }}} - -mk_uniq :: Int# -> Unique -mk_uniq u = mkUniqueGrimily (I# u) + }}}} notInScope :: TH.Name -> SDoc notInScope th_name = quotes (text (TH.pprint th_name)) <+> @@ -540,8 +547,8 @@ reifyThing (AGlobal (AnId id)) other -> return (TH.VarI v ty Nothing fix) } -reifyThing (AGlobal (ATyCon tc)) = do { dec <- reifyTyCon tc; return (TH.TyConI dec) } -reifyThing (AGlobal (AClass cls)) = do { dec <- reifyClass cls; return (TH.ClassI dec) } +reifyThing (AGlobal (ATyCon tc)) = reifyTyCon tc +reifyThing (AGlobal (AClass cls)) = reifyClass cls reifyThing (AGlobal (ADataCon dc)) = do { let name = dataConName dc ; ty <- reifyType (idType (dataConWrapId dc)) @@ -555,31 +562,30 @@ reifyThing (ATcId id _ _) ; fix <- reifyFixity (idName id) ; return (TH.VarI (reifyName id) ty2 Nothing fix) } -reifyThing (ATyVar tv) - = do { ty1 <- zonkTcTyVar tv +reifyThing (ATyVar tv ty) + = do { ty1 <- zonkTcType ty ; ty2 <- reifyType ty1 ; return (TH.TyVarI (reifyName tv) ty2) } ------------------------------ -reifyTyCon :: TyCon -> TcM TH.Dec +reifyTyCon :: TyCon -> TcM TH.Info reifyTyCon tc + | isFunTyCon tc = return (TH.PrimTyConI (reifyName tc) 2 False) + | isPrimTyCon tc = return (TH.PrimTyConI (reifyName tc) (tyConArity tc) (isUnLiftedTyCon tc)) | isSynTyCon tc - = do { let (tvs, rhs) = getSynTyConDefn tc + = do { let (tvs, rhs) = synTyConDefn tc ; rhs' <- reifyType rhs - ; return (TH.TySynD (reifyName tc) (reifyTyVars tvs) rhs') } + ; return (TH.TyConI $ TH.TySynD (reifyName tc) (reifyTyVars tvs) rhs') } reifyTyCon tc - = case algTyConRhs tc of - NewTyCon data_con _ _ - -> do { con <- reifyDataCon data_con - ; return (TH.NewtypeD [] (reifyName tc) (reifyTyVars (tyConTyVars tc)) - con [{- Don't know about deriving -}]) } - - DataTyCon mb_cxt cons _ - -> do { cxt <- reifyCxt (mb_cxt `orElse` []) - ; cons <- mapM reifyDataCon (tyConDataCons tc) - ; return (TH.DataD cxt (reifyName tc) (reifyTyVars (tyConTyVars tc)) - cons [{- Don't know about deriving -}]) } + = do { cxt <- reifyCxt (tyConStupidTheta tc) + ; cons <- mapM reifyDataCon (tyConDataCons tc) + ; let name = reifyName tc + tvs = reifyTyVars (tyConTyVars tc) + deriv = [] -- Don't know about deriving + decl | isNewTyCon tc = TH.NewtypeD cxt name tvs (head cons) deriv + | otherwise = TH.DataD cxt name tvs cons deriv + ; return (TH.TyConI decl) } reifyDataCon :: DataCon -> TcM TH.Con reifyDataCon dc @@ -596,7 +602,7 @@ reifyDataCon dc else if dataConIsInfix dc then ASSERT( length arg_tys == 2 ) - return (TH.InfixC (s1,a1) name (s1,a2)) + return (TH.InfixC (s1,a1) name (s2,a2)) else return (TH.NormalC name (stricts `zip` arg_tys)) } | otherwise @@ -604,11 +610,11 @@ reifyDataCon dc <+> quotes (ppr dc)) ------------------------------ -reifyClass :: Class -> TcM TH.Dec +reifyClass :: Class -> TcM TH.Info reifyClass cls = do { cxt <- reifyCxt theta ; ops <- mapM reify_op op_stuff - ; return (TH.ClassD cxt (reifyName cls) (reifyTyVars tvs) fds' ops) } + ; return (TH.ClassI $ TH.ClassD cxt (reifyName cls) (reifyTyVars tvs) fds' ops) } where (tvs, fds, theta, _, op_stuff) = classExtraBigSig cls fds' = map reifyFunDep fds @@ -650,10 +656,14 @@ reifyName :: NamedThing n => n -> TH.Name reifyName thing | isExternalName name = mk_varg mod occ_str | otherwise = TH.mkNameU occ_str (getKey (getUnique name)) + -- Many of the things we reify have local bindings, and + -- NameL's aren't supposed to appear in binding positions, so + -- we use NameU. When/if we start to reify nested things, that + -- have free variables, we may need to generate NameL's for them. where name = getName thing - mod = moduleUserString (nameModule name) - occ_str = occNameUserString occ + mod = moduleString (nameModule name) + occ_str = occNameString occ occ = nameOccName name mk_varg | OccName.isDataOcc occ = TH.mkNameG_d | OccName.isVarOcc occ = TH.mkNameG_v