2 % (c) The University of Glasgow 2001-2006
6 module MkExternalCore (
10 #include "HsVersions.h"
12 import qualified ExternalCore as C
19 import PprExternalCore () -- Instances
35 emitExternalCore :: DynFlags -> NameSet -> CgGuts -> IO ()
36 emitExternalCore dflags exports cg_guts
37 | opt_EmitExternalCore
38 = (do handle <- openFile corename WriteMode
39 hPutStrLn handle (show (mkExternalCore exports cg_guts))
41 `catch` (\err -> pprPanic "Failed to open or write external core output file"
43 where corename = extCoreName dflags
44 emitExternalCore _ _ _
49 mkExternalCore :: NameSet -> CgGuts -> C.Module
50 -- The ModGuts has been tidied, but the implicit bindings have
51 -- not been injected, so we have to add them manually here
52 -- We don't include the strange data-con *workers* because they are
53 -- implicit in the data type declaration itself
54 mkExternalCore exports (CgGuts {cg_module=this_mod, cg_tycons = tycons, cg_binds = binds})
55 = C.Module mname tdefs (map (make_vdef exports) binds)
57 mname = make_mid this_mod
58 tdefs = foldr collect_tdefs [] tycons
60 collect_tdefs :: TyCon -> [C.Tdef] -> [C.Tdef]
61 collect_tdefs tcon tdefs
62 | isAlgTyCon tcon = tdef: tdefs
64 tdef | isNewTyCon tcon =
65 C.Newtype (make_con_qid (tyConName tcon)) (map make_tbind tyvars) repclause
66 -- 20060420 GHC handles empty data types just fine. ExtCore should too! jds
67 -- | null (tyConDataCons tcon) = error "MkExternalCore died: can't handle datatype declarations with no data constructors"
69 C.Data (make_con_qid (tyConName tcon)) (map make_tbind tyvars) (map make_cdef (tyConDataCons tcon))
70 where repclause | isRecursiveTyCon tcon || isOpenTyCon tcon= Nothing
71 | otherwise = Just (make_ty rep)
72 where (_, rep) = newTyConRep tcon
73 tyvars = tyConTyVars tcon
75 collect_tdefs _ tdefs = tdefs
78 make_cdef :: DataCon -> C.Cdef
79 make_cdef dcon = C.Constr dcon_name existentials tys
81 dcon_name = make_var_id (dataConName dcon)
82 existentials = map make_tbind ex_tyvars
83 ex_tyvars = dataConExTyVars dcon
84 tys = map make_ty (dataConRepArgTys dcon)
86 make_tbind :: TyVar -> C.Tbind
87 make_tbind tv = (make_var_id (tyVarName tv), make_kind (tyVarKind tv))
89 make_vbind :: Var -> C.Vbind
90 make_vbind v = (make_var_id (Var.varName v), make_ty (idType v))
92 make_vdef :: NameSet -> CoreBind -> C.Vdefg
95 NonRec v e -> C.Nonrec (f (v,e))
96 Rec ves -> C.Rec (map f ves)
98 f (v,e) = (local, make_var_id (Var.varName v), make_ty (idType v),make_exp e)
99 where local = not $ elementOfUniqSet (Var.varName v) exports
100 -- Top level bindings are unqualified now
102 make_exp :: CoreExpr -> C.Exp
104 case globalIdDetails v of
105 -- a DataConId represents the Id of a worker, which is a varName. -- sof 4/02
106 -- DataConId _ -> C.Dcon (make_con_qid (Var.varName v))
107 FCallId (CCall (CCallSpec (StaticTarget nm) callconv _))
108 -> C.External (unpackFS nm) (showSDoc (ppr callconv)) (make_ty (idType v))
109 FCallId (CCall (CCallSpec DynamicTarget callconv _))
110 -> C.DynExternal (showSDoc (ppr callconv)) (make_ty (idType v))
112 -> pprPanic "MkExternalCore died: can't handle non-{static,dynamic}-C foreign call"
114 _ -> C.Var (make_var_qid (Var.varName v))
115 make_exp (Lit (l@(MachLabel s _))) = C.Label (unpackFS s)
116 make_exp (Lit l) = C.Lit (make_lit l)
117 make_exp (App e (Type t)) = C.Appt (make_exp e) (make_ty t)
118 make_exp (App e1 e2) = C.App (make_exp e1) (make_exp e2)
119 make_exp (Lam v e) | isTyVar v = C.Lam (C.Tb (make_tbind v)) (make_exp e)
120 make_exp (Lam v e) | otherwise = C.Lam (C.Vb (make_vbind v)) (make_exp e)
121 make_exp (Cast e co) = C.Cast (make_exp e) (make_ty co)
122 make_exp (Let b e) = C.Let (make_vdef emptyNameSet b) (make_exp e)
124 make_exp (Case e v ty alts) = C.Case (make_exp e) (make_vbind v) (make_ty ty) (map make_alt alts)
125 make_exp (Note (SCC cc) e) = C.Note "SCC" (make_exp e) -- temporary
126 make_exp (Note (CoreNote s) e) = C.Note s (make_exp e) -- hdaume: core annotations
127 make_exp (Note InlineMe e) = C.Note "InlineMe" (make_exp e)
128 make_exp _ = error "MkExternalCore died: make_exp"
130 make_alt :: CoreAlt -> C.Alt
131 make_alt (DataAlt dcon, vs, e) =
132 C.Acon (make_con_qid (dataConName dcon))
136 where (tbs,vbs) = span isTyVar vs
137 make_alt (LitAlt l,_,e) = C.Alit (make_lit l) (make_exp e)
138 make_alt (DEFAULT,[],e) = C.Adefault (make_exp e)
140 make_lit :: Literal -> C.Lit
143 MachChar i -> C.Lchar i t
144 MachStr s -> C.Lstring (unpackFS s) t
145 MachNullAddr -> C.Lint 0 t
146 MachInt i -> C.Lint i t
147 MachInt64 i -> C.Lint i t
148 MachWord i -> C.Lint i t
149 MachWord64 i -> C.Lint i t
150 MachFloat r -> C.Lrational r t
151 MachDouble r -> C.Lrational r t
152 _ -> error "MkExternalCore died: make_lit"
154 t = make_ty (literalType l)
156 make_ty :: Type -> C.Ty
157 make_ty (TyVarTy tv) = C.Tvar (make_var_id (tyVarName tv))
158 make_ty (AppTy t1 t2) = C.Tapp (make_ty t1) (make_ty t2)
159 make_ty (FunTy t1 t2) = make_ty (TyConApp funTyCon [t1,t2])
160 make_ty (ForAllTy tv t) = C.Tforall (make_tbind tv) (make_ty t)
161 make_ty (TyConApp tc ts) = foldl C.Tapp (C.Tcon (make_con_qid (tyConName tc)))
163 -- Newtypes are treated just like any other type constructor; not expanded
164 -- Reason: predTypeRep does substitution and, while substitution deals
165 -- correctly with name capture, it's only correct if you see the uniques!
166 -- If you just see occurrence names, name capture may occur.
167 -- Example: newtype A a = A (forall b. b -> a)
168 -- test :: forall q b. q -> A b
169 -- test _ = undefined
170 -- Here the 'a' gets substituted by 'b', which is captured.
171 -- Another solution would be to expand newtypes before tidying; but that would
172 -- expose the representation in interface files, which definitely isn't right.
173 -- Maybe CoreTidy should know whether to expand newtypes or not?
175 make_ty (PredTy p) = make_ty (predTypeRep p)
176 make_ty (NoteTy _ t) = make_ty t
180 make_kind :: Kind -> C.Kind
181 make_kind (PredTy p) | isEqPred p = C.Keq (make_ty t1) (make_ty t2)
182 where (t1, t2) = getEqPredTys p
183 make_kind (FunTy k1 k2) = C.Karrow (make_kind k1) (make_kind k2)
185 | isLiftedTypeKind k = C.Klifted
186 | isUnliftedTypeKind k = C.Kunlifted
187 | isOpenTypeKind k = C.Kopen
188 make_kind _ = error "MkExternalCore died: make_kind"
192 {- Use encoded strings.
193 Also, adjust casing to work around some badly-chosen internal names. -}
194 make_id :: Bool -> Name -> C.Id
195 make_id is_var nm = (occNameString . nameOccName) nm
197 {- SIMON thinks this stuff isn't necessary
200 'Z':cs | is_var -> 'z':cs
201 'z':cs | not is_var -> 'Z':cs
202 c:cs | isUpper c && is_var -> 'z':'d':n
203 c:cs | isLower c && (not is_var) -> 'Z':'d':n
205 where n = (occNameString . nameOccName) nm
208 make_var_id :: Name -> C.Id
209 make_var_id = make_id True
211 make_mid :: Module -> C.Id
212 make_mid = showSDoc . pprModule
214 make_qid :: Bool -> Name -> C.Qual C.Id
215 make_qid is_var n = (mname,make_id is_var n)
217 case nameModule_maybe n of
221 make_var_qid :: Name -> C.Qual C.Id
222 make_var_qid = make_qid True
224 make_con_qid :: Name -> C.Qual C.Id
225 make_con_qid = make_qid False