X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=ghc%2Fcompiler%2FhsSyn%2FConvert.lhs;h=6c14c11893008f64848cc9795853ed85d754f099;hb=04feba252e40d16101b92948cd1e13c7bc1f3062;hp=751623da35780d296ac5040f00e6ca15c11978b8;hpb=a7ecdf96844404b7bc8273d4ff6d85759278427c;p=ghc-hetmet.git diff --git a/ghc/compiler/hsSyn/Convert.lhs b/ghc/compiler/hsSyn/Convert.lhs index 751623d..6c14c11 100644 --- a/ghc/compiler/hsSyn/Convert.lhs +++ b/ghc/compiler/hsSyn/Convert.lhs @@ -16,124 +16,213 @@ import Language.Haskell.TH.Syntax as TH import HsSyn as Hs import qualified Class (FunDep) import RdrName ( RdrName, mkRdrUnqual, mkRdrQual, mkOrig, getRdrName, nameRdrName ) -import Name ( mkInternalName ) +import qualified Name ( Name, mkInternalName, getName ) import Module ( Module, mkModule ) import RdrHsSyn ( mkClassDecl, mkTyData ) import qualified OccName -import SrcLoc ( unLoc, Located(..), SrcSpan ) +import OccName ( startsVarId, startsVarSym, startsConId, startsConSym, + pprNameSpace ) +import SrcLoc ( Located(..), SrcSpan ) import Type ( Type ) -import TysWiredIn ( unitTyCon, tupleTyCon, trueDataCon ) +import TysWiredIn ( unitTyCon, tupleTyCon, tupleCon, trueDataCon, nilDataCon, consDataCon ) import BasicTypes( Boxity(..) ) import ForeignCall ( Safety(..), CCallConv(..), CCallTarget(..), CExportSpec(..)) import Char ( isAscii, isAlphaNum, isAlpha ) import List ( partition ) import Unique ( Unique, mkUniqueGrimily ) -import ErrUtils (Message) +import ErrUtils ( Message ) import GLAEXTS ( Int(..), Int# ) import SrcLoc ( noSrcLoc ) -import Bag ( emptyBag, consBag ) +import Bag ( listToBag ) import FastString import Outputable + ------------------------------------------------------------------- -convertToHsDecls :: SrcSpan -> [TH.Dec] -> [Either (LHsDecl RdrName) Message] +-- The external interface + +convertToHsDecls :: SrcSpan -> [TH.Dec] -> Either Message [LHsDecl RdrName] +convertToHsDecls loc ds = initCvt loc (mapM cvtTop ds) + +convertToHsExpr :: SrcSpan -> TH.Exp -> Either Message (LHsExpr RdrName) +convertToHsExpr loc e = initCvt loc (cvtl e) + +convertToHsType :: SrcSpan -> TH.Type -> Either Message (LHsType RdrName) +convertToHsType loc t = initCvt loc (cvtType t) + + +------------------------------------------------------------------- +newtype CvtM a = CvtM { unCvtM :: SrcSpan -> Either Message a } + -- Push down the source location; + -- Can fail, with a single error message + +-- NB: If the conversion succeeds with (Right x), there should +-- be no exception values hiding in x +-- Reason: so a (head []) in TH code doesn't subsequently +-- make GHC crash when it tries to walk the generated tree + -- Use the loc everywhere, for lack of anything better -- In particular, we want it on binding locations, so that variables bound in -- the spliced-in declarations get a location that at least relates to the splice point -convertToHsDecls loc ds = map (cvt_top loc) ds - -cvt_top :: SrcSpan -> TH.Dec -> Either (LHsDecl RdrName) Message -cvt_top loc d@(TH.ValD _ _ _) = Left $ L loc $ Hs.ValD (unLoc (cvtd loc d)) -cvt_top loc d@(TH.FunD _ _) = Left $ L loc $ Hs.ValD (unLoc (cvtd loc d)) -cvt_top loc (TH.SigD nm typ) = Left $ L loc $ Hs.SigD (Sig (L loc (vName nm)) (cvtType loc typ)) - -cvt_top loc (TySynD tc tvs rhs) - = Left $ L loc $ TyClD (TySynonym (L loc (tconName tc)) (cvt_tvs loc tvs) (cvtType loc rhs)) - -cvt_top loc (DataD ctxt tc tvs constrs derivs) - = Left $ L loc $ TyClD (mkTyData DataType - (L loc (cvt_context loc ctxt, L loc (tconName tc), cvt_tvs loc tvs)) - Nothing (map (mk_con loc) constrs) - (mk_derivs loc derivs)) - -cvt_top loc (NewtypeD ctxt tc tvs constr derivs) - = Left $ L loc $ TyClD (mkTyData NewType - (L loc (cvt_context loc ctxt, L loc (tconName tc), cvt_tvs loc tvs)) - Nothing [mk_con loc constr] - (mk_derivs loc derivs)) - -cvt_top loc (ClassD ctxt cl tvs fds decs) - = Left $ L loc $ TyClD $ mkClassDecl (cvt_context loc ctxt, - L loc (tconName cl), - cvt_tvs loc tvs) - (map (L loc . cvt_fundep) fds) - sigs - binds - where - (binds,sigs) = cvtBindsAndSigs loc decs -cvt_top loc (InstanceD tys ty decs) - = Left $ L loc $ InstD (InstDecl (L loc inst_ty) binds sigs) - where - (binds, sigs) = cvtBindsAndSigs loc decs - inst_ty = mkImplicitHsForAllTy (cvt_context loc tys) (L loc (HsPredTy (cvt_pred loc ty))) - -cvt_top loc (ForeignD (ImportF callconv safety from nm typ)) - = case parsed of - Just (c_header, cis) -> - let i = CImport callconv' safety' c_header nilFS cis - in Left $ L loc $ ForD (ForeignImport (L loc (vName nm)) (cvtType loc typ) i False) - Nothing -> Right $ text (show from) - <+> ptext SLIT("is not a valid ccall impent") - where callconv' = case callconv of - CCall -> CCallConv - StdCall -> StdCallConv - safety' = case safety of - Unsafe -> PlayRisky - Safe -> PlaySafe False - Threadsafe -> PlaySafe True - parsed = parse_ccall_impent (TH.nameBase nm) from - -cvt_top loc (ForeignD (ExportF callconv as nm typ)) - = let e = CExport (CExportStatic (mkFastString as) callconv') - in Left $ L loc $ ForD (ForeignExport (L loc (vName nm)) (cvtType loc typ) e False) - where callconv' = case callconv of - CCall -> CCallConv - StdCall -> StdCallConv - -mk_con loc con = L loc $ mk_nlcon con - where - mk_nlcon con = case con of - NormalC c strtys - -> ConDecl (L loc (cName c)) noExistentials (noContext loc) - (PrefixCon (map mk_arg strtys)) - RecC c varstrtys - -> ConDecl (L loc (cName c)) noExistentials (noContext loc) - (RecCon (map mk_id_arg varstrtys)) - InfixC st1 c st2 - -> ConDecl (L loc (cName c)) noExistentials (noContext loc) - (InfixCon (mk_arg st1) (mk_arg st2)) - ForallC tvs ctxt (ForallC tvs' ctxt' con') - -> mk_nlcon (ForallC (tvs ++ tvs') (ctxt ++ ctxt') con') - ForallC tvs ctxt con' -> case mk_nlcon con' of - ConDecl l [] (L _ []) x -> - ConDecl l (cvt_tvs loc tvs) (cvt_context loc ctxt) x - c -> panic "ForallC: Can't happen" - mk_arg (IsStrict, ty) = L loc $ HsBangTy HsStrict (cvtType loc ty) - mk_arg (NotStrict, ty) = cvtType loc ty - - mk_id_arg (i, IsStrict, ty) - = (L loc (vName i), L loc $ HsBangTy HsStrict (cvtType loc ty)) - mk_id_arg (i, NotStrict, ty) - = (L loc (vName i), cvtType loc ty) - -mk_derivs loc [] = Nothing -mk_derivs loc cs = Just [L loc $ HsPredTy $ HsClassP (tconName c) [] | c <- cs] - -cvt_fundep :: FunDep -> Class.FunDep RdrName -cvt_fundep (FunDep xs ys) = (map tName xs, map tName ys) +instance Monad CvtM where + return x = CvtM $ \loc -> Right x + (CvtM m) >>= k = CvtM $ \loc -> case m loc of + Left err -> Left err + Right v -> unCvtM (k v) loc + +initCvt :: SrcSpan -> CvtM a -> Either Message a +initCvt loc (CvtM m) = m loc + +force :: a -> CvtM a +force a = a `seq` return a + +failWith :: Message -> CvtM a +failWith m = CvtM (\loc -> Left full_msg) + where + full_msg = m $$ ptext SLIT("When splicing generated code into the program") + +returnL :: a -> CvtM (Located a) +returnL x = CvtM (\loc -> Right (L loc x)) + +wrapL :: CvtM a -> CvtM (Located a) +wrapL (CvtM m) = CvtM (\loc -> case m loc of + Left err -> Left err + Right v -> Right (L loc v)) + +------------------------------------------------------------------- +cvtTop :: TH.Dec -> CvtM (LHsDecl RdrName) +cvtTop d@(TH.ValD _ _ _) = do { L loc d' <- cvtBind d; return (L loc $ Hs.ValD d') } +cvtTop d@(TH.FunD _ _) = do { L loc d' <- cvtBind d; return (L loc $ Hs.ValD d') } +cvtTop (TH.SigD nm typ) = do { nm' <- vNameL nm + ; ty' <- cvtType typ + ; returnL $ Hs.SigD (TypeSig nm' ty') } + +cvtTop (TySynD tc tvs rhs) + = do { tc' <- tconNameL tc + ; tvs' <- cvtTvs tvs + ; rhs' <- cvtType rhs + ; returnL $ TyClD (TySynonym tc' tvs' rhs') } + +cvtTop (DataD ctxt tc tvs constrs derivs) + = do { stuff <- cvt_tycl_hdr ctxt tc tvs + ; cons' <- mapM cvtConstr constrs + ; derivs' <- cvtDerivs derivs + ; returnL $ TyClD (mkTyData DataType stuff Nothing cons' derivs') } + + +cvtTop (NewtypeD ctxt tc tvs constr derivs) + = do { stuff <- cvt_tycl_hdr ctxt tc tvs + ; con' <- cvtConstr constr + ; derivs' <- cvtDerivs derivs + ; returnL $ TyClD (mkTyData NewType stuff Nothing [con'] derivs') } + +cvtTop (ClassD ctxt cl tvs fds decs) + = do { stuff <- cvt_tycl_hdr ctxt cl tvs + ; fds' <- mapM cvt_fundep fds + ; (binds', sigs') <- cvtBindsAndSigs decs + ; returnL $ TyClD $ mkClassDecl stuff fds' sigs' binds' } + +cvtTop (InstanceD tys ty decs) + = do { (binds', sigs') <- cvtBindsAndSigs decs + ; ctxt' <- cvtContext tys + ; L loc pred' <- cvtPred ty + ; inst_ty' <- returnL $ mkImplicitHsForAllTy ctxt' (L loc (HsPredTy pred')) + ; returnL $ InstD (InstDecl inst_ty' binds' sigs') } + +cvtTop (ForeignD ford) = do { ford' <- cvtForD ford; returnL $ ForD ford' } + +cvt_tycl_hdr cxt tc tvs + = do { cxt' <- cvtContext cxt + ; tc' <- tconNameL tc + ; tvs' <- cvtTvs tvs + ; return (cxt', tc', tvs') } + +--------------------------------------------------- +-- Data types +-- Can't handle GADTs yet +--------------------------------------------------- + +cvtConstr (NormalC c strtys) + = do { c' <- cNameL c + ; cxt' <- returnL [] + ; tys' <- mapM cvt_arg strtys + ; returnL $ ConDecl c' Explicit noExistentials cxt' (PrefixCon tys') ResTyH98 } + +cvtConstr (RecC c varstrtys) + = do { c' <- cNameL c + ; cxt' <- returnL [] + ; args' <- mapM cvt_id_arg varstrtys + ; returnL $ ConDecl c' Explicit noExistentials cxt' (RecCon args') ResTyH98 } + +cvtConstr (InfixC st1 c st2) + = do { c' <- cNameL c + ; cxt' <- returnL [] + ; st1' <- cvt_arg st1 + ; st2' <- cvt_arg st2 + ; returnL $ ConDecl c' Explicit noExistentials cxt' (InfixCon st1' st2') ResTyH98 } + +cvtConstr (ForallC tvs ctxt (ForallC tvs' ctxt' con')) + = cvtConstr (ForallC (tvs ++ tvs') (ctxt ++ ctxt') con') + +cvtConstr (ForallC tvs ctxt con) + = do { L _ con' <- cvtConstr con + ; tvs' <- cvtTvs tvs + ; ctxt' <- cvtContext ctxt + ; case con' of + ConDecl l _ [] (L _ []) x ResTyH98 + -> returnL $ ConDecl l Explicit tvs' ctxt' x ResTyH98 + c -> panic "ForallC: Can't happen" } + +cvt_arg (IsStrict, ty) = do { ty' <- cvtType ty; returnL $ HsBangTy HsStrict ty' } +cvt_arg (NotStrict, ty) = cvtType ty + +cvt_id_arg (i, str, ty) = do { i' <- vNameL i + ; ty' <- cvt_arg (str,ty) + ; return (i', ty') } + +cvtDerivs [] = return Nothing +cvtDerivs cs = do { cs' <- mapM cvt_one cs + ; return (Just cs') } + where + cvt_one c = do { c' <- tconName c + ; returnL $ HsPredTy $ HsClassP c' [] } + +cvt_fundep :: FunDep -> CvtM (Located (Class.FunDep RdrName)) +cvt_fundep (FunDep xs ys) = do { xs' <- mapM tName xs; ys' <- mapM tName ys; returnL (xs', ys') } + +noExistentials = [] + +------------------------------------------ +-- Foreign declarations +------------------------------------------ + +cvtForD :: Foreign -> CvtM (ForeignDecl RdrName) +cvtForD (ImportF callconv safety from nm ty) + | Just (c_header, cis) <- parse_ccall_impent (TH.nameBase nm) from + = do { nm' <- vNameL nm + ; ty' <- cvtType ty + ; let i = CImport (cvt_conv callconv) safety' c_header nilFS cis + ; return $ ForeignImport nm' ty' i False } + + | otherwise + = failWith $ text (show from)<+> ptext SLIT("is not a valid ccall impent") + where + safety' = case safety of + Unsafe -> PlayRisky + Safe -> PlaySafe False + Threadsafe -> PlaySafe True + +cvtForD (ExportF callconv as nm ty) + = do { nm' <- vNameL nm + ; ty' <- cvtType ty + ; let e = CExport (CExportStatic (mkFastString as) (cvt_conv callconv)) + ; return $ ForeignExport nm' ty' e False } + +cvt_conv CCall = CCallConv +cvt_conv StdCall = StdCallConv parse_ccall_impent :: String -> String -> Maybe (FastString, CImportSpec) parse_ccall_impent nm s @@ -175,208 +264,241 @@ lex_ccall_impent xs = case span is_valid xs of where is_valid :: Char -> Bool is_valid c = isAscii c && (isAlphaNum c || c `elem` "._") -noContext loc = L loc [] -noExistentials = [] - -------------------------------------------------------------------- -convertToHsExpr :: SrcSpan -> TH.Exp -> LHsExpr RdrName -convertToHsExpr loc e = cvtl loc e -cvtl loc e = cvt_l e - where - cvt_l e = L loc (cvt e) +--------------------------------------------------- +-- Declarations +--------------------------------------------------- - cvt (VarE s) = HsVar (vName s) - cvt (ConE s) = HsVar (cName s) - cvt (LitE l) - | overloadedLit l = HsOverLit (cvtOverLit l) - | otherwise = HsLit (cvtLit l) +cvtDecs :: [TH.Dec] -> CvtM (HsLocalBinds RdrName) +cvtDecs [] = return EmptyLocalBinds +cvtDecs ds = do { (binds,sigs) <- cvtBindsAndSigs ds + ; return (HsValBinds (ValBindsIn binds sigs)) } - cvt (AppE x y) = HsApp (cvt_l x) (cvt_l y) - cvt (LamE ps e) = HsLam (mkMatchGroup [mkSimpleMatch (map (cvtlp loc) ps) (cvtl loc e)]) - cvt (TupE [e]) = cvt e - cvt (TupE es) = ExplicitTuple(map cvt_l es) Boxed - cvt (CondE x y z) = HsIf (cvt_l x) (cvt_l y) (cvt_l z) - cvt (LetE ds e) = HsLet (cvtdecs loc ds) (cvt_l e) - cvt (CaseE e ms) = HsCase (cvt_l e) (mkMatchGroup (map (cvtm loc) ms)) - cvt (DoE ss) = cvtHsDo loc DoExpr ss - cvt (CompE ss) = cvtHsDo loc ListComp ss - cvt (ArithSeqE dd) = ArithSeq noPostTcExpr (cvtdd loc dd) - cvt (ListE xs) = ExplicitList void (map cvt_l xs) - cvt (InfixE (Just x) s (Just y)) - = HsPar (L loc $ OpApp (cvt_l x) (cvt_l s) undefined (cvt_l y)) - cvt (InfixE Nothing s (Just y)) = SectionR (cvt_l s) (cvt_l y) - cvt (InfixE (Just x) s Nothing ) = SectionL (cvt_l x) (cvt_l s) - cvt (InfixE Nothing s Nothing ) = cvt s -- Can I indicate this is an infix thing? - cvt (SigE e t) = ExprWithTySig (cvt_l e) (cvtType loc t) - cvt (RecConE c flds) = RecordCon (L loc (cName c)) noPostTcExpr - (map (\(x,y) -> (L loc (vName x), cvt_l y)) flds) - cvt (RecUpdE e flds) = RecordUpd (cvt_l e) (map (\(x,y) -> (L loc (vName x), cvt_l y)) flds) - placeHolderType placeHolderType - -cvtHsDo loc do_or_lc stmts - = HsDo do_or_lc (init stmts') body void - where - stmts' = cvtstmts loc stmts - body = case last stmts' of - L _ (ExprStmt body _ _) -> body - -cvtdecs :: SrcSpan -> [TH.Dec] -> HsLocalBinds RdrName -cvtdecs loc [] = EmptyLocalBinds -cvtdecs loc ds = HsValBinds (ValBindsIn binds sigs) - where - (binds, sigs) = cvtBindsAndSigs loc ds - -cvtBindsAndSigs loc ds - = (cvtds loc non_sigs, map (cvtSig loc) sigs) +cvtBindsAndSigs ds + = do { binds' <- mapM cvtBind binds; sigs' <- mapM cvtSig sigs + ; return (listToBag binds', sigs') } where - (sigs, non_sigs) = partition sigP ds + (sigs, binds) = partition is_sig ds -cvtSig loc (TH.SigD nm typ) = L loc (Hs.Sig (L loc (vName nm)) (cvtType loc typ)) + is_sig (TH.SigD _ _) = True + is_sig other = False -cvtds :: SrcSpan -> [TH.Dec] -> LHsBinds RdrName -cvtds loc [] = emptyBag -cvtds loc (d:ds) = cvtd loc d `consBag` cvtds loc ds +cvtSig (TH.SigD nm ty) + = do { nm' <- vNameL nm; ty' <- cvtType ty; returnL (Hs.TypeSig nm' ty') } -cvtd :: SrcSpan -> TH.Dec -> LHsBind RdrName +cvtBind :: TH.Dec -> CvtM (LHsBind RdrName) -- Used only for declarations in a 'let/where' clause, -- not for top level decls -cvtd loc (TH.ValD (TH.VarP s) body ds) - = L loc $ FunBind (L loc (vName s)) False - (mkMatchGroup [cvtclause loc (Clause [] body ds)]) - placeHolderNames -cvtd loc (FunD nm cls) - = L loc $ FunBind (L loc (vName nm)) False - (mkMatchGroup (map (cvtclause loc) cls)) - placeHolderNames -cvtd loc (TH.ValD p body ds) - = L loc $ PatBind (cvtlp loc p) (GRHSs (cvtguard loc body) (cvtdecs loc ds)) - void placeHolderNames - -cvtd loc d = cvtPanic "Illegal kind of declaration in where clause" - (text (TH.pprint d)) - - -cvtclause :: SrcSpan -> TH.Clause -> Hs.LMatch RdrName -cvtclause loc (Clause ps body wheres) - = L loc $ Hs.Match (map (cvtlp loc) ps) Nothing (GRHSs (cvtguard loc body) (cvtdecs loc wheres)) - - - -cvtdd :: SrcSpan -> Range -> ArithSeqInfo RdrName -cvtdd loc (FromR x) = (From (cvtl loc x)) -cvtdd loc (FromThenR x y) = (FromThen (cvtl loc x) (cvtl loc y)) -cvtdd loc (FromToR x y) = (FromTo (cvtl loc x) (cvtl loc y)) -cvtdd loc (FromThenToR x y z) = (FromThenTo (cvtl loc x) (cvtl loc y) (cvtl loc z)) - - -cvtstmts :: SrcSpan -> [TH.Stmt] -> [Hs.LStmt RdrName] -cvtstmts loc [] = [] -cvtstmts loc (NoBindS e : ss) = L loc (mkExprStmt (cvtl loc e)) : cvtstmts loc ss -cvtstmts loc (TH.BindS p e : ss) = L loc (mkBindStmt (cvtlp loc p) (cvtl loc e)) : cvtstmts loc ss -cvtstmts loc (TH.LetS ds : ss) = L loc (LetStmt (cvtdecs loc ds)) : cvtstmts loc ss -cvtstmts loc (TH.ParS dss : ss) = L loc (ParStmt [(cvtstmts loc ds, undefined) | ds <- dss]) : cvtstmts loc ss - -cvtm :: SrcSpan -> TH.Match -> Hs.LMatch RdrName -cvtm loc (TH.Match p body wheres) - = L loc (Hs.Match [cvtlp loc p] Nothing (GRHSs (cvtguard loc body) (cvtdecs loc wheres))) - -cvtguard :: SrcSpan -> TH.Body -> [LGRHS RdrName] -cvtguard loc (GuardedB pairs) = map (cvtpair loc) pairs -cvtguard loc (NormalB e) = [L loc (GRHS [] (cvtl loc e))] - -cvtpair :: SrcSpan -> (TH.Guard,TH.Exp) -> LGRHS RdrName -cvtpair loc (NormalG x,y) = L loc (GRHS [L loc $ mkBindStmt truePat (cvtl loc x)] - (cvtl loc y)) -cvtpair loc (PatG x,y) = L loc (GRHS (cvtstmts loc x) (cvtl loc y)) - -cvtOverLit :: Lit -> HsOverLit RdrName -cvtOverLit (IntegerL i) = mkHsIntegral i -cvtOverLit (RationalL r) = mkHsFractional r --- An Integer is like an an (overloaded) '3' in a Haskell source program --- Similarly 3.5 for fractionals - -cvtLit :: Lit -> HsLit -cvtLit (IntPrimL i) = HsIntPrim i -cvtLit (FloatPrimL f) = HsFloatPrim f -cvtLit (DoublePrimL f) = HsDoublePrim f -cvtLit (CharL c) = HsChar c -cvtLit (StringL s) = HsString (mkFastString s) - -cvtlp :: SrcSpan -> TH.Pat -> Hs.LPat RdrName -cvtlp loc pat = L loc (cvtp loc pat) - -cvtp :: SrcSpan -> TH.Pat -> Hs.Pat RdrName -cvtp loc (TH.LitP l) - | overloadedLit l = mkNPat (cvtOverLit l) Nothing -- Not right for negative - -- patterns; need to think - -- about that! - | otherwise = Hs.LitPat (cvtLit l) -cvtp loc (TH.VarP s) = Hs.VarPat(vName s) -cvtp loc (TupP [p]) = cvtp loc p -cvtp loc (TupP ps) = TuplePat (map (cvtlp loc) ps) Boxed -cvtp loc (ConP s ps) = ConPatIn (L loc (cName s)) (PrefixCon (map (cvtlp loc) ps)) -cvtp loc (InfixP p1 s p2) - = ConPatIn (L loc (cName s)) (InfixCon (cvtlp loc p1) (cvtlp loc p2)) -cvtp loc (TildeP p) = LazyPat (cvtlp loc p) -cvtp loc (TH.AsP s p) = AsPat (L loc (vName s)) (cvtlp loc p) -cvtp loc TH.WildP = WildPat void -cvtp loc (RecP c fs) = ConPatIn (L loc (cName c)) $ Hs.RecCon (map (\(s,p) -> (L loc (vName s),cvtlp loc p)) fs) -cvtp loc (ListP ps) = ListPat (map (cvtlp loc) ps) void -cvtp loc (SigP p t) = SigPatIn (cvtlp loc p) (cvtType loc t) - ------------------------------------------------------------ --- Types and type variables +cvtBind (TH.ValD (TH.VarP s) body ds) + = do { s' <- vNameL s + ; cl' <- cvtClause (Clause [] body ds) + ; returnL $ mkFunBind s' [cl'] } + +cvtBind (TH.FunD nm cls) + = do { nm' <- vNameL nm + ; cls' <- mapM cvtClause cls + ; returnL $ mkFunBind nm' cls' } + +cvtBind (TH.ValD p body ds) + = do { p' <- cvtPat p + ; g' <- cvtGuard body + ; ds' <- cvtDecs ds + ; returnL $ PatBind { pat_lhs = p', pat_rhs = GRHSs g' ds', + pat_rhs_ty = void, bind_fvs = placeHolderNames } } + +cvtBind d + = failWith (sep [ptext SLIT("Illegal kind of declaration in where clause"), + nest 2 (text (TH.pprint d))]) + +cvtClause :: TH.Clause -> CvtM (Hs.LMatch RdrName) +cvtClause (Clause ps body wheres) + = do { ps' <- cvtPats ps + ; g' <- cvtGuard body + ; ds' <- cvtDecs wheres + ; returnL $ Hs.Match ps' Nothing (GRHSs g' ds') } -cvt_tvs :: SrcSpan -> [TH.Name] -> [LHsTyVarBndr RdrName] -cvt_tvs loc tvs = map (L loc . UserTyVar . tName) tvs -cvt_context :: SrcSpan -> Cxt -> LHsContext RdrName -cvt_context loc tys = L loc (map (L loc . cvt_pred loc) tys) +------------------------------------------------------------------- +-- Expressions +------------------------------------------------------------------- -cvt_pred :: SrcSpan -> TH.Type -> HsPred RdrName -cvt_pred loc ty - = case split_ty_app ty of - (ConT tc, tys) -> HsClassP (tconName tc) (map (cvtType loc) tys) - (VarT tv, tys) -> HsClassP (tName tv) (map (cvtType loc) tys) - other -> cvtPanic "Malformed predicate" (text (TH.pprint ty)) +cvtl :: TH.Exp -> CvtM (LHsExpr RdrName) +cvtl e = wrapL (cvt e) + where + cvt (VarE s) = do { s' <- vName s; return $ HsVar s' } + cvt (ConE s) = do { s' <- cName s; return $ HsVar s' } + cvt (LitE l) + | overloadedLit l = do { l' <- cvtOverLit l; return $ HsOverLit l' } + | otherwise = do { l' <- cvtLit l; return $ HsLit l' } -convertToHsType = cvtType + cvt (AppE x y) = do { x' <- cvtl x; y' <- cvtl y; return $ HsApp x' y' } + cvt (LamE ps e) = do { ps' <- cvtPats ps; e' <- cvtl e + ; return $ HsLam (mkMatchGroup [mkSimpleMatch ps' e']) } + cvt (TupE [e]) = cvt e + cvt (TupE es) = do { es' <- mapM cvtl es; return $ ExplicitTuple es' Boxed } + cvt (CondE x y z) = do { x' <- cvtl x; y' <- cvtl y; z' <- cvtl z + ; return $ HsIf x' y' z' } + cvt (LetE ds e) = do { ds' <- cvtDecs ds; e' <- cvtl e; return $ HsLet ds' e' } + cvt (CaseE e ms) = do { e' <- cvtl e; ms' <- mapM cvtMatch ms + ; return $ HsCase e' (mkMatchGroup ms') } + cvt (DoE ss) = cvtHsDo DoExpr ss + cvt (CompE ss) = cvtHsDo ListComp ss + cvt (ArithSeqE dd) = do { dd' <- cvtDD dd; return $ ArithSeq noPostTcExpr dd' } + cvt (ListE xs) = do { xs' <- mapM cvtl xs; return $ ExplicitList void xs' } + cvt (InfixE (Just x) s (Just y)) = do { x' <- cvtl x; s' <- cvtl s; y' <- cvtl y + ; e' <- returnL $ OpApp x' s' undefined y' + ; return $ HsPar e' } + cvt (InfixE Nothing s (Just y)) = do { s' <- cvtl s; y' <- cvtl y + ; return $ SectionR s' y' } + cvt (InfixE (Just x) s Nothing ) = do { x' <- cvtl x; s' <- cvtl s + ; return $ SectionL x' s' } + cvt (InfixE Nothing s Nothing ) = cvt s -- Can I indicate this is an infix thing? -cvtType :: SrcSpan -> TH.Type -> LHsType RdrName -cvtType loc ty = trans (root ty []) - where root (AppT a b) zs = root a (cvtType loc b : zs) - root t zs = (t,zs) + cvt (SigE e t) = do { e' <- cvtl e; t' <- cvtType t + ; return $ ExprWithTySig e' t' } + cvt (RecConE c flds) = do { c' <- cNameL c + ; flds' <- mapM cvtFld flds + ; return $ RecordCon c' noPostTcExpr flds' } + cvt (RecUpdE e flds) = do { e' <- cvtl e + ; flds' <- mapM cvtFld flds + ; return $ RecordUpd e' flds' placeHolderType placeHolderType } + +cvtFld (v,e) = do { v' <- vNameL v; e' <- cvtl e; return (v',e') } + +cvtDD :: Range -> CvtM (ArithSeqInfo RdrName) +cvtDD (FromR x) = do { x' <- cvtl x; return $ From x' } +cvtDD (FromThenR x y) = do { x' <- cvtl x; y' <- cvtl y; return $ FromThen x' y' } +cvtDD (FromToR x y) = do { x' <- cvtl x; y' <- cvtl y; return $ FromTo x' y' } +cvtDD (FromThenToR x y z) = do { x' <- cvtl x; y' <- cvtl y; z' <- cvtl z; return $ FromThenTo x' y' z' } + +------------------------------------- +-- Do notation and statements +------------------------------------- + +cvtHsDo do_or_lc stmts + = do { stmts' <- cvtStmts stmts + ; let body = case last stmts' of + L _ (ExprStmt body _ _) -> body + ; return $ HsDo do_or_lc (init stmts') body void } + +cvtStmts = mapM cvtStmt + +cvtStmt :: TH.Stmt -> CvtM (Hs.LStmt RdrName) +cvtStmt (NoBindS e) = do { e' <- cvtl e; returnL $ mkExprStmt e' } +cvtStmt (TH.BindS p e) = do { p' <- cvtPat p; e' <- cvtl e; returnL $ mkBindStmt p' e' } +cvtStmt (TH.LetS ds) = do { ds' <- cvtDecs ds; returnL $ LetStmt ds' } +cvtStmt (TH.ParS dss) = do { dss' <- mapM cvt_one dss; returnL $ ParStmt dss' } + where + cvt_one ds = do { ds' <- cvtStmts ds; return (ds', undefined) } + +cvtMatch :: TH.Match -> CvtM (Hs.LMatch RdrName) +cvtMatch (TH.Match p body decs) + = do { p' <- cvtPat p + ; g' <- cvtGuard body + ; decs' <- cvtDecs decs + ; returnL $ Hs.Match [p'] Nothing (GRHSs g' decs') } + +cvtGuard :: TH.Body -> CvtM [LGRHS RdrName] +cvtGuard (GuardedB pairs) = mapM cvtpair pairs +cvtGuard (NormalB e) = do { e' <- cvtl e; g' <- returnL $ GRHS [] e'; return [g'] } + +cvtpair :: (TH.Guard, TH.Exp) -> CvtM (LGRHS RdrName) +cvtpair (NormalG ge,rhs) = do { ge' <- cvtl ge; rhs' <- cvtl rhs + ; g' <- returnL $ mkBindStmt truePat ge' + ; returnL $ GRHS [g'] rhs' } +cvtpair (PatG gs,rhs) = do { gs' <- cvtStmts gs; rhs' <- cvtl rhs + ; returnL $ GRHS gs' rhs' } + +cvtOverLit :: Lit -> CvtM (HsOverLit RdrName) +cvtOverLit (IntegerL i) = do { force i; return $ mkHsIntegral i } +cvtOverLit (RationalL r) = do { force r; return $ mkHsFractional r } +-- An Integer is like an an (overloaded) '3' in a Haskell source program +-- Similarly 3.5 for fractionals - trans (TupleT n,args) - | length args == n = L loc (HsTupleTy Boxed args) - | n == 0 = foldl nlHsAppTy (nlHsTyVar (getRdrName unitTyCon)) args - | otherwise = foldl nlHsAppTy (nlHsTyVar (getRdrName (tupleTyCon Boxed n))) args - trans (ArrowT, [x,y]) = nlHsFunTy x y - trans (ListT, [x]) = L loc (HsListTy x) +cvtLit :: Lit -> CvtM HsLit +cvtLit (IntPrimL i) = do { force i; return $ HsIntPrim i } +cvtLit (FloatPrimL f) = do { force f; return $ HsFloatPrim f } +cvtLit (DoublePrimL f) = do { force f; return $ HsDoublePrim f } +cvtLit (CharL c) = do { force c; return $ HsChar c } +cvtLit (StringL s) = do { let { s' = mkFastString s }; force s'; return $ HsString s' } + +cvtPats :: [TH.Pat] -> CvtM [Hs.LPat RdrName] +cvtPats pats = mapM cvtPat pats + +cvtPat :: TH.Pat -> CvtM (Hs.LPat RdrName) +cvtPat pat = wrapL (cvtp pat) + +cvtp :: TH.Pat -> CvtM (Hs.Pat RdrName) +cvtp (TH.LitP l) + | overloadedLit l = do { l' <- cvtOverLit l + ; return (mkNPat l' Nothing) } + -- Not right for negative patterns; + -- need to think about that! + | otherwise = do { l' <- cvtLit l; return $ Hs.LitPat l' } +cvtp (TH.VarP s) = do { s' <- vName s; return $ Hs.VarPat s' } +cvtp (TupP [p]) = cvtp p +cvtp (TupP ps) = do { ps' <- cvtPats ps; return $ TuplePat ps' Boxed void } +cvtp (ConP s ps) = do { s' <- cNameL s; ps' <- cvtPats ps; return $ ConPatIn s' (PrefixCon ps') } +cvtp (InfixP p1 s p2) = do { s' <- cNameL s; p1' <- cvtPat p1; p2' <- cvtPat p2 + ; return $ ConPatIn s' (InfixCon p1' p2') } +cvtp (TildeP p) = do { p' <- cvtPat p; return $ LazyPat p' } +cvtp (TH.AsP s p) = do { s' <- vNameL s; p' <- cvtPat p; return $ AsPat s' p' } +cvtp TH.WildP = return $ WildPat void +cvtp (RecP c fs) = do { c' <- cNameL c; fs' <- mapM cvtPatFld fs + ; return $ ConPatIn c' $ Hs.RecCon fs' } +cvtp (ListP ps) = do { ps' <- cvtPats ps; return $ ListPat ps' void } +cvtp (SigP p t) = do { p' <- cvtPat p; t' <- cvtType t; return $ SigPatIn p' t' } + +cvtPatFld (s,p) = do { s' <- vNameL s; p' <- cvtPat p; return (s',p') } - trans (VarT nm, args) = foldl nlHsAppTy (nlHsTyVar (tName nm)) args - trans (ConT tc, args) = foldl nlHsAppTy (nlHsTyVar (tconName tc)) args +----------------------------------------------------------- +-- Types and type variables - trans (ForallT tvs cxt ty, []) = L loc $ mkExplicitHsForAllTy - (cvt_tvs loc tvs) (cvt_context loc cxt) (cvtType loc ty) +cvtTvs :: [TH.Name] -> CvtM [LHsTyVarBndr RdrName] +cvtTvs tvs = mapM cvt_tv tvs + +cvt_tv tv = do { tv' <- tName tv; returnL $ UserTyVar tv' } + +cvtContext :: Cxt -> CvtM (LHsContext RdrName) +cvtContext tys = do { preds' <- mapM cvtPred tys; returnL preds' } + +cvtPred :: TH.Type -> CvtM (LHsPred RdrName) +cvtPred ty + = do { (head, tys') <- split_ty_app ty + ; case head of + ConT tc -> do { tc' <- tconName tc; returnL $ HsClassP tc' tys' } + VarT tv -> do { tv' <- tName tv; returnL $ HsClassP tv' tys' } + other -> failWith (ptext SLIT("Malformed predicate") <+> text (TH.pprint ty)) } + +cvtType :: TH.Type -> CvtM (LHsType RdrName) +cvtType ty = do { (head, tys') <- split_ty_app ty + ; case head of + TupleT n | length tys' == n -> returnL (HsTupleTy Boxed tys') + | n == 0 -> mk_apps (HsTyVar (getRdrName unitTyCon)) tys' + | otherwise -> mk_apps (HsTyVar (getRdrName (tupleTyCon Boxed n))) tys' + ArrowT | [x',y'] <- tys' -> returnL (HsFunTy x' y') + ListT | [x'] <- tys' -> returnL (HsListTy x') + VarT nm -> do { nm' <- tName nm; mk_apps (HsTyVar nm') tys' } + ConT nm -> do { nm' <- tconName nm; mk_apps (HsTyVar nm') tys' } + + ForallT tvs cxt ty | null tys' -> do { tvs' <- cvtTvs tvs + ; cxt' <- cvtContext cxt + ; ty' <- cvtType ty + ; returnL $ mkExplicitHsForAllTy tvs' cxt' ty' } + otherwise -> failWith (ptext SLIT("Malformed type") <+> text (show ty)) + } + where + mk_apps head [] = returnL head + mk_apps head (ty:tys) = do { head' <- returnL head; mk_apps (HsAppTy head' ty) tys } -split_ty_app :: TH.Type -> (TH.Type, [TH.Type]) +split_ty_app :: TH.Type -> CvtM (TH.Type, [LHsType RdrName]) split_ty_app ty = go ty [] where - go (AppT f a) as = go f (a:as) - go f as = (f,as) + go (AppT f a) as' = do { a' <- cvtType a; go f (a':as') } + go f as = return (f,as) ----------------------------------------------------------- -sigP :: Dec -> Bool -sigP (TH.SigD _ _) = True -sigP other = False - ------------------------------------------------------------ -cvtPanic :: String -> SDoc -> b -cvtPanic herald thing - = pprPanic herald (thing $$ ptext SLIT("When splicing generated code into the program")) ----------------------------------------------------------- -- some useful things @@ -397,34 +519,82 @@ void = placeHolderType -------------------------------------------------------------------- -- variable names -vName :: TH.Name -> RdrName -vName = thRdrName OccName.varName +vNameL, cNameL, tconNameL :: TH.Name -> CvtM (Located RdrName) +vName, cName, tName, tconName :: TH.Name -> CvtM RdrName + +vNameL n = wrapL (vName n) +vName n = cvtName OccName.varName n -- Constructor function names; this is Haskell source, hence srcDataName -cName :: TH.Name -> RdrName -cName = thRdrName OccName.srcDataName +cNameL n = wrapL (cName n) +cName n = cvtName OccName.dataName n -- Type variable names -tName :: TH.Name -> RdrName -tName = thRdrName OccName.tvName +tName n = cvtName OccName.tvName n -- Type Constructor names -tconName = thRdrName OccName.tcName +tconNameL n = wrapL (tconName n) +tconName n = cvtName OccName.tcClsName n + +cvtName :: OccName.NameSpace -> TH.Name -> CvtM RdrName +cvtName ctxt_ns (TH.Name occ flavour) + | not (okOcc ctxt_ns occ_str) = failWith (badOcc ctxt_ns occ_str) + | otherwise = force (thRdrName ctxt_ns occ_str flavour) + where + occ_str = TH.occString occ -thRdrName :: OccName.NameSpace -> TH.Name -> RdrName +okOcc :: OccName.NameSpace -> String -> Bool +okOcc _ [] = False +okOcc ns str@(c:_) + | OccName.isVarName ns = startsVarId c || startsVarSym c + | otherwise = startsConId c || startsConSym c || str == "[]" + +badOcc :: OccName.NameSpace -> String -> SDoc +badOcc ctxt_ns occ + = ptext SLIT("Illegal") <+> pprNameSpace ctxt_ns + <+> ptext SLIT("name:") <+> quotes (text occ) + +thRdrName :: OccName.NameSpace -> String -> TH.NameFlavour -> RdrName -- This turns a Name into a RdrName -- The passed-in name space tells what the context is expecting; -- use it unless the TH name knows what name-space it comes -- from, in which case use the latter -thRdrName ctxt_ns (TH.Name occ (TH.NameG th_ns mod)) = mkOrig (mk_mod mod) (mk_occ (mk_ghc_ns th_ns) occ) -thRdrName ctxt_ns (TH.Name occ (TH.NameL uniq)) = nameRdrName (mkInternalName (mk_uniq uniq) (mk_occ ctxt_ns occ) noSrcLoc) -thRdrName ctxt_ns (TH.Name occ (TH.NameQ mod)) = mkRdrQual (mk_mod mod) (mk_occ ctxt_ns occ) -thRdrName ctxt_ns (TH.Name occ TH.NameS) = mkRdrUnqual (mk_occ ctxt_ns occ) -thRdrName ctxt_ns (TH.Name occ (TH.NameU uniq)) = mkRdrUnqual (mk_uniq_occ ctxt_ns occ uniq) +-- +-- ToDo: we may generate silly RdrNames, by passing a name space +-- that doesn't match the string, like VarName ":+", +-- which will give confusing error messages later +-- +-- The strict applications ensure that any buried exceptions get forced +thRdrName ctxt_ns occ (TH.NameG th_ns mod) = (mkOrig $! (mk_mod mod)) $! (mk_occ (mk_ghc_ns th_ns) occ) +thRdrName ctxt_ns occ (TH.NameL uniq) = nameRdrName $! (((Name.mkInternalName $! (mk_uniq uniq)) $! (mk_occ ctxt_ns occ)) noSrcLoc) +thRdrName ctxt_ns occ (TH.NameQ mod) = (mkRdrQual $! (mk_mod mod)) $! (mk_occ ctxt_ns occ) +thRdrName ctxt_ns occ (TH.NameU uniq) = mkRdrUnqual $! (mk_uniq_occ ctxt_ns occ uniq) +thRdrName ctxt_ns occ TH.NameS + | Just name <- isBuiltInOcc ctxt_ns occ = nameRdrName $! name + | otherwise = mkRdrUnqual $! (mk_occ ctxt_ns occ) + +isBuiltInOcc :: OccName.NameSpace -> String -> Maybe Name.Name +-- Built in syntax isn't "in scope" so an Unqual RdrName won't do +-- We must generate an Exact name, just as the parser does +isBuiltInOcc ctxt_ns occ + = case occ of + ":" -> Just (Name.getName consDataCon) + "[]" -> Just (Name.getName nilDataCon) + "()" -> Just (tup_name 0) + '(' : ',' : rest -> go_tuple 2 rest + other -> Nothing + where + go_tuple n ")" = Just (tup_name n) + go_tuple n (',' : rest) = go_tuple (n+1) rest + go_tuple n other = Nothing + + tup_name n + | OccName.isTcClsName ctxt_ns = Name.getName (tupleTyCon Boxed n) + | otherwise = Name.getName (tupleCon Boxed n) -mk_uniq_occ :: OccName.NameSpace -> TH.OccName -> Int# -> OccName.OccName +mk_uniq_occ :: OccName.NameSpace -> String -> Int# -> OccName.OccName mk_uniq_occ ns occ uniq - = OccName.mkOccName ns (TH.occString occ ++ '[' : shows (mk_uniq uniq) "]") + = OccName.mkOccName ns (occ ++ '[' : shows (mk_uniq uniq) "]") -- The idea here is to make a name that -- a) the user could not possibly write, and -- b) cannot clash with another NameU @@ -434,15 +604,15 @@ mk_uniq_occ ns occ uniq -- rapidly baked into data constructors and the like. Baling out -- and generating an unqualified RdrName here is the simple solution +-- The packing and unpacking is rather turgid :-( +mk_occ :: OccName.NameSpace -> String -> OccName.OccName +mk_occ ns occ = OccName.mkOccNameFS ns (mkFastString occ) + mk_ghc_ns :: TH.NameSpace -> OccName.NameSpace -mk_ghc_ns DataName = OccName.dataName +mk_ghc_ns TH.DataName = OccName.dataName mk_ghc_ns TH.TcClsName = OccName.tcClsName mk_ghc_ns TH.VarName = OccName.varName --- The packing and unpacking is rather turgid :-( -mk_occ :: OccName.NameSpace -> TH.OccName -> OccName.OccName -mk_occ ns occ = OccName.mkOccFS ns (mkFastString (TH.occString occ)) - mk_mod :: TH.ModName -> Module mk_mod mod = mkModule (TH.modString mod)