X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=ghc%2Fcompiler%2FhsSyn%2FConvert.lhs;h=6c14c11893008f64848cc9795853ed85d754f099;hb=04feba252e40d16101b92948cd1e13c7bc1f3062;hp=2e8b83a02f0fe322182e441fd963c1874d697ad8;hpb=99b85ea1e23d32f912e8a8339f83712f1a7b5d49;p=ghc-hetmet.git diff --git a/ghc/compiler/hsSyn/Convert.lhs b/ghc/compiler/hsSyn/Convert.lhs index 2e8b83a..6c14c11 100644 --- a/ghc/compiler/hsSyn/Convert.lhs +++ b/ghc/compiler/hsSyn/Convert.lhs @@ -6,292 +6,617 @@ This module converts Template Haskell syntax into HsSyn \begin{code} -module Convert( convertToHsExpr, convertToHsDecls ) where +module Convert( convertToHsExpr, convertToHsDecls, convertToHsType, thRdrName ) where #include "HsVersions.h" -import Language.Haskell.THSyntax as Meta +import Language.Haskell.TH as TH hiding (sigP) +import Language.Haskell.TH.Syntax as TH import HsSyn as Hs - ( HsExpr(..), HsLit(..), ArithSeqInfo(..), - HsDoContext(..), - Match(..), GRHSs(..), GRHS(..), HsPred(..), - HsDecl(..), TyClDecl(..), InstDecl(..), ConDecl(..), - Stmt(..), HsBinds(..), MonoBinds(..), Sig(..), - Pat(..), HsConDetails(..), HsOverLit, BangType(..), - placeHolderType, HsType(..), HsTupCon(..), - HsTyVarBndr(..), HsContext, - mkSimpleMatch - ) - -import RdrName ( RdrName, mkRdrUnqual, mkRdrQual, mkOrig ) -import Module ( mkModuleName ) -import RdrHsSyn ( mkHsIntegral, mkClassDecl, mkTyData ) -import OccName -import SrcLoc ( SrcLoc, generatedSrcLoc ) -import TyCon ( DataConDetails(..) ) +import qualified Class (FunDep) +import RdrName ( RdrName, mkRdrUnqual, mkRdrQual, mkOrig, getRdrName, nameRdrName ) +import qualified Name ( Name, mkInternalName, getName ) +import Module ( Module, mkModule ) +import RdrHsSyn ( mkClassDecl, mkTyData ) +import qualified OccName +import OccName ( startsVarId, startsVarSym, startsConId, startsConSym, + pprNameSpace ) +import SrcLoc ( Located(..), SrcSpan ) import Type ( Type ) -import BasicTypes( Boxity(..), RecFlag(Recursive), - NewOrData(..), StrictnessMark(..) ) -import FastString( mkFastString ) -import Char ( ord, isAlphaNum ) +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 GLAEXTS ( Int(..), Int# ) +import SrcLoc ( noSrcLoc ) +import Bag ( listToBag ) +import FastString import Outputable + ------------------------------------------------------------------- -convertToHsDecls :: [Meta.Dec] -> [HsDecl RdrName] -convertToHsDecls ds - = ValD (cvtdecs binds_and_sigs) : map cvt_top top_decls - where - (binds_and_sigs, top_decls) = partition sigOrBindP ds +-- The external interface -cvt_top (Data tc tvs constrs derivs) - = TyClD (mkTyData DataType - (noContext, tconName tc, cvt_tvs tvs) - (DataCons (map mk_con constrs)) - (mk_derivs derivs) loc0) - where - mk_con (Constr c tys) - = ConDecl (cName c) noExistentials noContext - (PrefixCon (map mk_arg tys)) loc0 +convertToHsDecls :: SrcSpan -> [TH.Dec] -> Either Message [LHsDecl RdrName] +convertToHsDecls loc ds = initCvt loc (mapM cvtTop ds) - mk_arg ty = BangType NotMarkedStrict (cvtType ty) +convertToHsExpr :: SrcSpan -> TH.Exp -> Either Message (LHsExpr RdrName) +convertToHsExpr loc e = initCvt loc (cvtl e) - mk_derivs [] = Nothing - mk_derivs cs = Just [HsClassP (tconName c) [] | c <- cs] +convertToHsType :: SrcSpan -> TH.Type -> Either Message (LHsType RdrName) +convertToHsType loc t = initCvt loc (cvtType t) -cvt_top (Class ctxt cl tvs decs) - = TyClD (mkClassDecl (cvt_context ctxt, tconName cl, cvt_tvs tvs) - noFunDeps - sigs (Just binds) loc0) - where - (binds,sigs) = cvtBindsAndSigs decs -cvt_top (Instance tys ty decs) - = InstD (InstDecl inst_ty binds sigs Nothing loc0) - where - (binds, sigs) = cvtBindsAndSigs decs - inst_ty = HsForAllTy Nothing - (cvt_context tys) - (HsPredTy (cvt_pred ty)) +------------------------------------------------------------------- +newtype CvtM a = CvtM { unCvtM :: SrcSpan -> Either Message a } + -- Push down the source location; + -- Can fail, with a single error message -noContext = [] -noExistentials = [] -noFunDeps = [] +-- 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 + +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)) ------------------------------------------------------------------- -convertToHsExpr :: Meta.Exp -> HsExpr RdrName -convertToHsExpr = cvt - -cvt (Var s) = HsVar(vName s) -cvt (Con s) = HsVar(cName s) -cvt (Lit l) - | overloadedLit l = HsOverLit (cvtOverLit l) - | otherwise = HsLit (cvtLit l) - -cvt (App x y) = HsApp (cvt x) (cvt y) -cvt (Lam ps e) = HsLam (mkSimpleMatch (map cvtp ps) (cvt e) void loc0) -cvt (Tup es) = ExplicitTuple(map cvt es) Boxed -cvt (Cond x y z) = HsIf (cvt x) (cvt y) (cvt z) loc0 -cvt (Let ds e) = HsLet (cvtdecs ds) (cvt e) -cvt (Case e ms) = HsCase (cvt e) (map cvtm ms) loc0 -cvt (Do ss) = HsDo DoExpr (cvtstmts ss) [] void loc0 -cvt (Comp ss) = HsDo ListComp (cvtstmts ss) [] void loc0 -cvt (ArithSeq dd) = ArithSeqIn (cvtdd dd) -cvt (ListExp xs) = ExplicitList void (map cvt xs) -cvt (Infix (Just x) s (Just y)) = OpApp (cvt x) (HsVar(vName s)) undefined (cvt y) -cvt (Infix Nothing s (Just y)) = SectionR (HsVar(vName s)) (cvt y) -cvt (Infix (Just x) s Nothing ) = SectionL (cvt x) (HsVar(vName s)) -cvt (Infix Nothing s Nothing ) = HsVar(vName s) -- Can I indicate this is an infix thing? - - -cvtdecs :: [Meta.Dec] -> HsBinds RdrName -cvtdecs [] = EmptyBinds -cvtdecs ds = MonoBind binds sigs Recursive - where - (binds, sigs) = cvtBindsAndSigs ds +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 + = case lex_ccall_impent s of + Just ["dynamic"] -> Just (nilFS, CFunction DynamicTarget) + Just ["wrapper"] -> Just (nilFS, CWrapper) + Just ("static":ts) -> parse_ccall_impent_static nm ts + Just ts -> parse_ccall_impent_static nm ts + Nothing -> Nothing + +parse_ccall_impent_static :: String + -> [String] + -> Maybe (FastString, CImportSpec) +parse_ccall_impent_static nm ts + = let ts' = case ts of + [ "&", cid] -> [ cid] + [fname, "&" ] -> [fname ] + [fname, "&", cid] -> [fname, cid] + _ -> ts + in case ts' of + [ cid] | is_cid cid -> Just (nilFS, mk_cid cid) + [fname, cid] | is_cid cid -> Just (mkFastString fname, mk_cid cid) + [ ] -> Just (nilFS, mk_cid nm) + [fname ] -> Just (mkFastString fname, mk_cid nm) + _ -> Nothing + where is_cid :: String -> Bool + is_cid x = all (/= '.') x && (isAlpha (head x) || head x == '_') + mk_cid :: String -> CImportSpec + mk_cid = CFunction . StaticTarget . mkFastString + +lex_ccall_impent :: String -> Maybe [String] +lex_ccall_impent "" = Just [] +lex_ccall_impent ('&':xs) = fmap ("&":) $ lex_ccall_impent xs +lex_ccall_impent (' ':xs) = lex_ccall_impent xs +lex_ccall_impent ('\t':xs) = lex_ccall_impent xs +lex_ccall_impent xs = case span is_valid xs of + ("", _) -> Nothing + (t, xs') -> fmap (t:) $ lex_ccall_impent xs' + where is_valid :: Char -> Bool + is_valid c = isAscii c && (isAlphaNum c || c `elem` "._") + + +--------------------------------------------------- +-- Declarations +--------------------------------------------------- + +cvtDecs :: [TH.Dec] -> CvtM (HsLocalBinds RdrName) +cvtDecs [] = return EmptyLocalBinds +cvtDecs ds = do { (binds,sigs) <- cvtBindsAndSigs ds + ; return (HsValBinds (ValBindsIn binds sigs)) } cvtBindsAndSigs ds - = (cvtds non_sigs, map cvtSig sigs) + = 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 (Proto nm typ) = Sig (vName nm) (cvtType typ) loc0 + is_sig (TH.SigD _ _) = True + is_sig other = False -cvtds :: [Meta.Dec] -> MonoBinds RdrName -cvtds [] = EmptyMonoBinds -cvtds (d:ds) = AndMonoBinds (cvtd d) (cvtds ds) +cvtSig (TH.SigD nm ty) + = do { nm' <- vNameL nm; ty' <- cvtType ty; returnL (Hs.TypeSig nm' ty') } -cvtd :: Meta.Dec -> MonoBinds RdrName +cvtBind :: TH.Dec -> CvtM (LHsBind RdrName) -- Used only for declarations in a 'let/where' clause, -- not for top level decls -cvtd (Val (Pvar s) body ds) = FunMonoBind (vName s) False - (panic "what now?") loc0 -cvtd (Fun nm cls) = FunMonoBind (vName nm) False (map cvtclause cls) loc0 -cvtd (Val p body ds) = PatMonoBind (cvtp p) (GRHSs (cvtguard body) - (cvtdecs ds) - void) loc0 -cvtd x = panic "Illegal kind of declaration in where clause" - - -cvtclause :: Meta.Clause (Meta.Pat) (Meta.Exp) (Meta.Dec) -> Hs.Match RdrName -cvtclause (ps,body,wheres) = Match (map cvtp ps) Nothing - (GRHSs (cvtguard body) (cvtdecs wheres) void) - - - -cvtdd :: Meta.DDt -> ArithSeqInfo RdrName -cvtdd (Meta.From x) = (Hs.From (cvt x)) -cvtdd (Meta.FromThen x y) = (Hs.FromThen (cvt x) (cvt y)) -cvtdd (Meta.FromTo x y) = (Hs.FromTo (cvt x) (cvt y)) -cvtdd (Meta.FromThenTo x y z) = (Hs.FromThenTo (cvt x) (cvt y) (cvt z)) - - -cvtstmts :: [Meta.Stm] -> [Hs.Stmt RdrName] -cvtstmts [] = [] -- this is probably an error as every [stmt] should end with ResultStmt -cvtstmts [NoBindSt e] = [ResultStmt (cvt e) loc0] -- when its the last element use ResultStmt -cvtstmts (NoBindSt e : ss) = ExprStmt (cvt e) void loc0 : cvtstmts ss -cvtstmts (BindSt p e : ss) = BindStmt (cvtp p) (cvt e) loc0 : cvtstmts ss -cvtstmts (LetSt ds : ss) = LetStmt (cvtdecs ds) : cvtstmts ss -cvtstmts (ParSt dss : ss) = ParStmt(map cvtstmts dss) : cvtstmts ss - - -cvtm :: Meta.Mat -> Hs.Match RdrName -cvtm (p,body,wheres) = Match [cvtp p] Nothing - (GRHSs (cvtguard body) (cvtdecs wheres) void) - -cvtguard :: Meta.Rhs -> [GRHS RdrName] -cvtguard (Guarded pairs) = map cvtpair pairs -cvtguard (Normal e) = [GRHS [ ResultStmt (cvt e) loc0 ] loc0] - -cvtpair :: (Meta.Exp,Meta.Exp) -> GRHS RdrName -cvtpair (x,y) = GRHS [BindStmt truePat (cvt x) loc0, - ResultStmt (cvt y) loc0] loc0 - -cvtOverLit :: Lit -> HsOverLit -cvtOverLit (Int i) = mkHsIntegral (fromInt i) --- An Int is like an an (overloaded) '3' in a Haskell source program - -cvtLit :: Lit -> HsLit -cvtLit (Char c) = HsChar (ord c) -cvtLit (CrossStage s) = error "What do we do about crossStage constants?" - -cvtp :: Meta.Pat -> Hs.Pat RdrName -cvtp (Plit l) - | overloadedLit l = NPatIn (cvtOverLit l) Nothing -- Not right for negative - -- patterns; need to think - -- about that! - | otherwise = LitPat (cvtLit l) -cvtp (Pvar s) = VarPat(vName s) -cvtp (Ptup ps) = TuplePat (map cvtp ps) Boxed -cvtp (Pcon s ps) = ConPatIn (cName s) (PrefixCon (map cvtp ps)) -cvtp (Ptilde p) = LazyPat (cvtp p) -cvtp (Paspat s p) = AsPat (vName s) (cvtp p) -cvtp Pwild = WildPat void +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') } + + +------------------------------------------------------------------- +-- Expressions +------------------------------------------------------------------- + +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' } + + 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? + + 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 + +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') } ----------------------------------------------------------- -- Types and type variables -cvt_tvs :: [String] -> [HsTyVarBndr RdrName] -cvt_tvs tvs = map (UserTyVar . tName) tvs - -cvt_context :: Context -> HsContext RdrName -cvt_context tys = map cvt_pred tys - -cvt_pred :: Typ -> HsPred RdrName -cvt_pred ty = case split_ty_app ty of - (Tvar tc, tys) -> HsClassP (tconName tc) (map cvtType tys) - other -> panic "Malformed predicate" - -cvtType :: Meta.Typ -> HsType RdrName -cvtType (Tvar nm) = HsTyVar(tName nm) -cvtType (Tapp x y) = trans (root x [y]) - where root (Tapp a b) zs = root a (b:zs) - root t zs = (t,zs) - trans (Tcon (Tuple n),args) = HsTupleTy (HsTupCon Boxed n) (map cvtType args) - trans (Tcon Arrow,[x,y]) = HsFunTy (cvtType x) (cvtType y) - trans (Tcon List,[x]) = HsListTy (cvtType x) - trans (Tcon (Name nm),args) = HsTyVar(tconName nm) - trans (t,args) = panic "bad type application" - -split_ty_app :: Typ -> (Typ, [Typ]) +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 -> CvtM (TH.Type, [LHsType RdrName]) split_ty_app ty = go ty [] where - go (Tapp 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 (Proto _ _) = True -sigP other = False - -sigOrBindP :: Dec -> Bool -sigOrBindP (Proto _ _) = True -sigOrBindP (Val _ _ _) = True -sigOrBindP (Fun _ _) = True -sigOrBindP other = False ----------------------------------------------------------- -- some useful things -truePat = ConPatIn (cName "True") (PrefixCon []) -falsePat = ConPatIn (cName "False") (PrefixCon []) +truePat = nlConPat (getRdrName trueDataCon) [] overloadedLit :: Lit -> Bool -- True for literals that Haskell treats as overloaded -overloadedLit (Int l) = True -overloadedLit l = False +overloadedLit (IntegerL l) = True +overloadedLit (RationalL l) = True +overloadedLit l = False void :: Type.Type void = placeHolderType -loc0 :: SrcLoc -loc0 = generatedSrcLoc - -fromInt :: Int -> Integer -fromInt x = toInteger x +-------------------------------------------------------------------- +-- Turning Name back into RdrName +-------------------------------------------------------------------- -- variable names -vName :: String -> RdrName -vName = mkName varName +vNameL, cNameL, tconNameL :: TH.Name -> CvtM (Located RdrName) +vName, cName, tName, tconName :: TH.Name -> CvtM RdrName --- Constructor function names -cName :: String -> RdrName -cName = mkName dataName +vNameL n = wrapL (vName n) +vName n = cvtName OccName.varName n + +-- Constructor function names; this is Haskell source, hence srcDataName +cNameL n = wrapL (cName n) +cName n = cvtName OccName.dataName n -- Type variable names -tName :: String -> RdrName -tName = mkName tvName +tName n = cvtName OccName.tvName n -- Type Constructor names -tconName = mkName tcName - -mkName :: NameSpace -> String -> RdrName --- Parse the string to see if it has a "." or ":" in it --- so we know whether to generate a qualified or original name --- It's a bit tricky because we need to parse --- Foo.Baz.x as Qual Foo.Baz x --- So we parse it from back to front +tconNameL n = wrapL (tconName n) +tconName n = cvtName OccName.tcClsName n -mkName ns str - = split [] (reverse str) +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 - split occ [] = mkRdrUnqual (mk_occ occ) - split occ (c:d:rev) -- 'd' is the last char before the separator - | is_sep c -- E.g. Fo.x d='o' - && isAlphaNum d -- Fo.+: d='+' perhaps - = mk_qual (reverse (d:rev)) c occ - split occ (c:rev) = split (c:occ) rev - - mk_qual mod '.' occ = mkRdrQual (mk_mod mod) (mk_occ occ) - mk_qual mod ':' occ = mkOrig (mk_mod mod) (mk_occ occ) - - mk_occ occ = mkOccFS ns (mkFastString occ) - mk_mod mod = mkModuleName mod - - is_sep '.' = True - is_sep ':' = True - is_sep other = False + occ_str = TH.occString occ + +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 +-- +-- 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 -> String -> Int# -> OccName.OccName +mk_uniq_occ ns occ 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 + -- Previously I generated an Exact RdrName with mkInternalName. + -- This works fine for local binders, but does not work at all for + -- top-level binders, which must have External Names, since they are + -- 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 TH.DataName = OccName.dataName +mk_ghc_ns TH.TcClsName = OccName.tcClsName +mk_ghc_ns TH.VarName = OccName.varName + +mk_mod :: TH.ModName -> Module +mk_mod mod = mkModule (TH.modString mod) + +mk_uniq :: Int# -> Unique +mk_uniq u = mkUniqueGrimily (I# u) \end{code} +