X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=compiler%2FhsSyn%2FConvert.lhs;h=06f611553c67828537ec522f5a4335c3c7628322;hb=a76ba381f76fd9a5178e815206466a97dab46f75;hp=84a61ffc268bd064781ec2b98132dd4cc7f2af9d;hpb=972c3fc8b0771d72141b85f2735e5d9d6b452137;p=ghc-hetmet.git diff --git a/compiler/hsSyn/Convert.lhs b/compiler/hsSyn/Convert.lhs index 84a61ff..06f6115 100644 --- a/compiler/hsSyn/Convert.lhs +++ b/compiler/hsSyn/Convert.lhs @@ -14,9 +14,7 @@ This module converts Template Haskell syntax into HsSyn -- for details module Convert( convertToHsExpr, convertToPat, convertToHsDecls, - convertToHsType, thRdrName ) where - -#include "HsVersions.h" + convertToHsType, thRdrNameGuesses ) where import HsSyn as Hs import qualified Class @@ -53,14 +51,14 @@ convertToHsDecls loc ds = initCvt loc (mapM cvtTop ds) convertToHsExpr :: SrcSpan -> TH.Exp -> Either Message (LHsExpr RdrName) convertToHsExpr loc e = case initCvt loc (cvtl e) of - Left msg -> Left (msg $$ (ptext SLIT("When converting TH expression") + Left msg -> Left (msg $$ (ptext (sLit "When splicing TH expression:") <+> text (show e))) Right res -> Right res convertToPat :: SrcSpan -> TH.Pat -> Either Message (LPat RdrName) convertToPat loc e = case initCvt loc (cvtPat e) of - Left msg -> Left (msg $$ (ptext SLIT("When converting TH pattern") + Left msg -> Left (msg $$ (ptext (sLit "When splicing TH pattern:") <+> text (show e))) Right res -> Right res @@ -97,7 +95,7 @@ force a = a `seq` return a failWith :: Message -> CvtM a failWith m = CvtM (\_ -> Left full_msg) where - full_msg = m $$ ptext SLIT("When splicing generated code into the program") + full_msg = m $$ ptext (sLit "When splicing generated code into the program") returnL :: a -> CvtM (Located a) returnL x = CvtM (\loc -> Right (L loc x)) @@ -148,7 +146,7 @@ cvtTop (InstanceD tys ty decs) ; L loc pred' <- cvtPred ty ; inst_ty' <- returnL $ mkImplicitHsForAllTy ctxt' (L loc (HsPredTy pred')) ; returnL $ InstD (InstDecl inst_ty' binds' sigs' []) - -- ^^no ATs in TH + -- no ATs in TH ^^ } cvtTop (ForeignD ford) = do { ford' <- cvtForD ford; returnL $ ForD ford' } @@ -239,7 +237,7 @@ cvtForD (ImportF callconv safety from nm ty) ; return $ ForeignImport nm' ty' i } | otherwise - = failWith $ text (show from)<+> ptext SLIT("is not a valid ccall impent") + = failWith $ text (show from)<+> ptext (sLit "is not a valid ccall impent") where safety' = case safety of Unsafe -> PlayRisky @@ -329,6 +327,11 @@ cvtBind (TH.ValD (TH.VarP s) body ds) ; returnL $ mkFunBind s' [cl'] } cvtBind (TH.FunD nm cls) + | null cls + = failWith (ptext (sLit "Function binding for") + <+> quotes (text (TH.pprint nm)) + <+> ptext (sLit "has no equations")) + | otherwise = do { nm' <- vNameL nm ; cls' <- mapM cvtClause cls ; returnL $ mkFunBind nm' cls' } @@ -341,7 +344,7 @@ cvtBind (TH.ValD p body ds) pat_rhs_ty = void, bind_fvs = placeHolderNames } } cvtBind d - = failWith (sep [ptext SLIT("Illegal kind of declaration in where clause"), + = failWith (sep [ptext (sLit "Illegal kind of declaration in where clause"), nest 2 (text (TH.pprint d))]) cvtClause :: TH.Clause -> CvtM (Hs.LMatch RdrName) @@ -368,12 +371,14 @@ cvtl e = wrapL (cvt e) 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 [e]) = cvt e -- Singleton tuples treated like nothing (just parens) 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 + cvt (CaseE e ms) + | null ms = failWith (ptext (sLit "Case expression with no alternatives")) + | otherwise = 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 @@ -414,6 +419,8 @@ cvtDD (FromThenToR x y z) = do { x' <- cvtl x; y' <- cvtl y; z' <- cvtl z; retur cvtHsDo :: HsStmtContext Name.Name -> [TH.Stmt] -> CvtM (HsExpr RdrName) cvtHsDo do_or_lc stmts + | null stmts = failWith (ptext (sLit "Empty stmt list in do-block")) + | otherwise = do { stmts' <- cvtStmts stmts ; let body = case last stmts' of L _ (ExprStmt body _ _) -> body @@ -457,6 +464,7 @@ cvtOverLit (StringL s) = do { let { s' = mkFastString s }; force s'; return $ cvtLit :: Lit -> CvtM HsLit cvtLit (IntPrimL i) = do { force i; return $ HsIntPrim i } +cvtLit (WordPrimL w) = do { force w; return $ HsWordPrim w } 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 } @@ -512,16 +520,21 @@ cvtPred ty ; case head of ConT tc -> do { tc' <- tconName tc; returnL $ HsClassP tc' tys' } VarT tv -> do { tv' <- tName tv; returnL $ HsClassP tv' tys' } - _ -> failWith (ptext SLIT("Malformed predicate") <+> text (TH.pprint ty)) } + _ -> 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' +cvtType ty = do { (head_ty, tys') <- split_ty_app ty + ; case head_ty of + TupleT n | length tys' == n -- Saturated + -> if n==1 then return (head tys') -- Singleton tuples treated + -- like nothing (ie just parens) + else returnL (HsTupleTy Boxed tys') + | n == 1 -> failWith (ptext (sLit "Illegal 1-tuple type constructor")) | otherwise -> mk_apps (HsTyVar (getRdrName (tupleTyCon Boxed n))) tys' ArrowT | [x',y'] <- tys' -> returnL (HsFunTy x' y') + | otherwise -> mk_apps (HsTyVar (getRdrName funTyCon)) tys' ListT | [x'] <- tys' -> returnL (HsListTy x') + | otherwise -> mk_apps (HsTyVar (getRdrName listTyCon)) tys' VarT nm -> do { nm' <- tName nm; mk_apps (HsTyVar nm') tys' } ConT nm -> do { nm' <- tconName nm; mk_apps (HsTyVar nm') tys' } @@ -529,11 +542,12 @@ cvtType ty = do { (head, tys') <- split_ty_app ty ; cxt' <- cvtContext cxt ; ty' <- cvtType ty ; returnL $ mkExplicitHsForAllTy tvs' cxt' ty' } - _ -> failWith (ptext SLIT("Malformed type") <+> text (show ty)) + _ -> 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 } + mk_apps head_ty [] = returnL head_ty + mk_apps head_ty (ty:tys) = do { head_ty' <- returnL head_ty + ; mk_apps (HsAppTy head_ty' ty) tys } split_ty_app :: TH.Type -> CvtM (TH.Type, [LHsType RdrName]) split_ty_app ty = go ty [] @@ -588,13 +602,13 @@ cvtName ctxt_ns (TH.Name occ flavour) okOcc :: OccName.NameSpace -> String -> Bool okOcc _ [] = False okOcc ns str@(c:_) - | OccName.isVarName ns = startsVarId c || startsVarSym c - | otherwise = startsConId c || startsConSym c || str == "[]" + | OccName.isVarNameSpace 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) + = 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 @@ -607,7 +621,7 @@ thRdrName :: OccName.NameSpace -> String -> TH.NameFlavour -> RdrName -- which will give confusing error messages later -- -- The strict applications ensure that any buried exceptions get forced -thRdrName _ occ (TH.NameG th_ns pkg mod) = (mkOrig $! (mkModule (mk_pkg pkg) (mk_mod mod))) $! (mk_occ (mk_ghc_ns th_ns) occ) +thRdrName _ occ (TH.NameG th_ns pkg mod) = thOrigRdrName occ th_ns pkg mod thRdrName ctxt_ns occ (TH.NameL uniq) = nameRdrName $! (((Name.mkInternalName $! (mk_uniq uniq)) $! (mk_occ ctxt_ns occ)) noSrcSpan) 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) @@ -615,6 +629,21 @@ thRdrName ctxt_ns occ TH.NameS | Just name <- isBuiltInOcc ctxt_ns occ = nameRdrName $! name | otherwise = mkRdrUnqual $! (mk_occ ctxt_ns occ) +thOrigRdrName :: String -> TH.NameSpace -> PkgName -> ModName -> RdrName +thOrigRdrName occ th_ns pkg mod = (mkOrig $! (mkModule (mk_pkg pkg) (mk_mod mod))) $! (mk_occ (mk_ghc_ns th_ns) occ) + +thRdrNameGuesses :: TH.Name -> [RdrName] +thRdrNameGuesses (TH.Name occ flavour) + -- This special case for NameG ensures that we don't generate duplicates in the output list + | TH.NameG th_ns pkg mod <- flavour = [thOrigRdrName occ_str th_ns pkg mod] + | otherwise = [ thRdrName gns occ_str flavour + | gns <- guessed_nss] + where + -- guessed_ns are the name spaces guessed from looking at the TH name + guessed_nss | isLexCon (mkFastString occ_str) = [OccName.tcName, OccName.dataName] + | otherwise = [OccName.varName, OccName.tvName] + occ_str = TH.occString 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 @@ -631,8 +660,8 @@ isBuiltInOcc ctxt_ns occ go_tuple _ _ = Nothing tup_name n - | OccName.isTcClsName ctxt_ns = Name.getName (tupleTyCon Boxed n) - | otherwise = Name.getName (tupleCon Boxed n) + | OccName.isTcClsNameSpace 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