2 % (c) The University of Glasgow 2001-2006
6 -- The above warning supression flag is a temporary kludge.
7 -- While working on this module you are encouraged to remove it and fix
8 -- any warnings in the module. See
9 -- http://hackage.haskell.org/trac/ghc/wiki/Commentary/CodingStyle#Warnings
12 module MkExternalCore (
16 #include "HsVersions.h"
18 import qualified ExternalCore as C
25 import PprExternalCore () -- Instances
41 emitExternalCore :: DynFlags -> NameSet -> CgGuts -> IO ()
42 emitExternalCore dflags exports cg_guts
43 | opt_EmitExternalCore
44 = (do handle <- openFile corename WriteMode
45 hPutStrLn handle (show (mkExternalCore exports cg_guts))
47 `catch` (\err -> pprPanic "Failed to open or write external core output file"
49 where corename = extCoreName dflags
50 emitExternalCore _ _ _
55 mkExternalCore :: NameSet -> CgGuts -> C.Module
56 -- The ModGuts has been tidied, but the implicit bindings have
57 -- not been injected, so we have to add them manually here
58 -- We don't include the strange data-con *workers* because they are
59 -- implicit in the data type declaration itself
60 mkExternalCore exports (CgGuts {cg_module=this_mod, cg_tycons = tycons, cg_binds = binds})
61 = C.Module mname tdefs (map (make_vdef exports) binds)
63 mname = make_mid this_mod
64 tdefs = foldr collect_tdefs [] tycons
66 collect_tdefs :: TyCon -> [C.Tdef] -> [C.Tdef]
67 collect_tdefs tcon tdefs
68 | isAlgTyCon tcon = tdef: tdefs
70 tdef | isNewTyCon tcon =
71 C.Newtype (make_con_qid (tyConName tcon)) (map make_tbind tyvars) repclause
73 C.Data (make_con_qid (tyConName tcon)) (map make_tbind tyvars) (map make_cdef (tyConDataCons tcon))
74 where repclause | isRecursiveTyCon tcon || isOpenTyCon tcon= Nothing
75 | otherwise = Just (make_ty (repType rhs))
76 where (_, rhs) = newTyConRhs tcon
77 tyvars = tyConTyVars tcon
79 collect_tdefs _ tdefs = tdefs
82 make_cdef :: DataCon -> C.Cdef
83 make_cdef dcon = C.Constr dcon_name existentials tys
85 dcon_name = make_var_id (dataConName dcon)
86 existentials = map make_tbind ex_tyvars
87 ex_tyvars = dataConExTyVars dcon
88 tys = map make_ty (dataConRepArgTys dcon)
90 make_tbind :: TyVar -> C.Tbind
91 make_tbind tv = (make_var_id (tyVarName tv), make_kind (tyVarKind tv))
93 make_vbind :: Var -> C.Vbind
94 make_vbind v = (make_var_id (Var.varName v), make_ty (idType v))
96 make_vdef :: NameSet -> CoreBind -> C.Vdefg
99 NonRec v e -> C.Nonrec (f (v,e))
100 Rec ves -> C.Rec (map f ves)
102 f (v,e) = (local, make_var_id (Var.varName v), make_ty (idType v),make_exp e)
103 where local = not $ elementOfUniqSet (Var.varName v) exports
104 -- Top level bindings are unqualified now
106 make_exp :: CoreExpr -> C.Exp
108 case globalIdDetails v of
109 -- a DataConId represents the Id of a worker, which is a varName. -- sof 4/02
110 -- DataConId _ -> C.Dcon (make_con_qid (Var.varName v))
111 FCallId (CCall (CCallSpec (StaticTarget nm) callconv _))
112 -> C.External (unpackFS nm) (showSDoc (ppr callconv)) (make_ty (idType v))
113 FCallId (CCall (CCallSpec DynamicTarget callconv _))
114 -> C.DynExternal (showSDoc (ppr callconv)) (make_ty (idType v))
116 -> pprPanic "MkExternalCore died: can't handle non-{static,dynamic}-C foreign call"
118 _ -> C.Var (make_var_qid (Var.varName v))
119 make_exp (Lit (l@(MachLabel s _))) = C.Label (unpackFS s)
120 make_exp (Lit l) = C.Lit (make_lit l)
121 make_exp (App e (Type t)) = C.Appt (make_exp e) (make_ty t)
122 make_exp (App e1 e2) = C.App (make_exp e1) (make_exp e2)
123 make_exp (Lam v e) | isTyVar v = C.Lam (C.Tb (make_tbind v)) (make_exp e)
124 make_exp (Lam v e) | otherwise = C.Lam (C.Vb (make_vbind v)) (make_exp e)
125 make_exp (Cast e co) = C.Cast (make_exp e) (make_ty co)
126 make_exp (Let b e) = C.Let (make_vdef emptyNameSet b) (make_exp e)
128 make_exp (Case e v ty alts) = C.Case (make_exp e) (make_vbind v) (make_ty ty) (map make_alt alts)
129 make_exp (Note (SCC cc) e) = C.Note "SCC" (make_exp e) -- temporary
130 make_exp (Note (CoreNote s) e) = C.Note s (make_exp e) -- hdaume: core annotations
131 make_exp (Note InlineMe e) = C.Note "InlineMe" (make_exp e)
132 make_exp _ = error "MkExternalCore died: make_exp"
134 make_alt :: CoreAlt -> C.Alt
135 make_alt (DataAlt dcon, vs, e) =
136 C.Acon (make_con_qid (dataConName dcon))
140 where (tbs,vbs) = span isTyVar vs
141 make_alt (LitAlt l,_,e) = C.Alit (make_lit l) (make_exp e)
142 make_alt (DEFAULT,[],e) = C.Adefault (make_exp e)
144 make_lit :: Literal -> C.Lit
147 MachChar i -> C.Lchar i t
148 MachStr s -> C.Lstring (unpackFS s) t
149 MachNullAddr -> C.Lint 0 t
150 MachInt i -> C.Lint i t
151 MachInt64 i -> C.Lint i t
152 MachWord i -> C.Lint i t
153 MachWord64 i -> C.Lint i t
154 MachFloat r -> C.Lrational r t
155 MachDouble r -> C.Lrational r t
156 _ -> error "MkExternalCore died: make_lit"
158 t = make_ty (literalType l)
160 make_ty :: Type -> C.Ty
161 make_ty (TyVarTy tv) = C.Tvar (make_var_id (tyVarName tv))
162 make_ty (AppTy t1 t2) = C.Tapp (make_ty t1) (make_ty t2)
163 make_ty (FunTy t1 t2) = make_ty (TyConApp funTyCon [t1,t2])
164 make_ty (ForAllTy tv t) = C.Tforall (make_tbind tv) (make_ty t)
165 make_ty (TyConApp tc ts) = foldl C.Tapp (C.Tcon (make_con_qid (tyConName tc)))
167 -- Newtypes are treated just like any other type constructor; not expanded
168 -- Reason: predTypeRep does substitution and, while substitution deals
169 -- correctly with name capture, it's only correct if you see the uniques!
170 -- If you just see occurrence names, name capture may occur.
171 -- Example: newtype A a = A (forall b. b -> a)
172 -- test :: forall q b. q -> A b
173 -- test _ = undefined
174 -- Here the 'a' gets substituted by 'b', which is captured.
175 -- Another solution would be to expand newtypes before tidying; but that would
176 -- expose the representation in interface files, which definitely isn't right.
177 -- Maybe CoreTidy should know whether to expand newtypes or not?
179 make_ty (PredTy p) = make_ty (predTypeRep p)
180 make_ty (NoteTy _ t) = make_ty t
184 make_kind :: Kind -> C.Kind
185 make_kind (PredTy p) | isEqPred p = C.Keq (make_ty t1) (make_ty t2)
186 where (t1, t2) = getEqPredTys p
187 make_kind (FunTy k1 k2) = C.Karrow (make_kind k1) (make_kind k2)
189 | isLiftedTypeKind k = C.Klifted
190 | isUnliftedTypeKind k = C.Kunlifted
191 | isOpenTypeKind k = C.Kopen
192 make_kind _ = error "MkExternalCore died: make_kind"
196 {- Use encoded strings.
197 Also, adjust casing to work around some badly-chosen internal names. -}
198 make_id :: Bool -> Name -> C.Id
199 make_id is_var nm = (occNameString . nameOccName) nm
201 {- SIMON thinks this stuff isn't necessary
204 'Z':cs | is_var -> 'z':cs
205 'z':cs | not is_var -> 'Z':cs
206 c:cs | isUpper c && is_var -> 'z':'d':n
207 c:cs | isLower c && (not is_var) -> 'Z':'d':n
209 where n = (occNameString . nameOccName) nm
212 make_var_id :: Name -> C.Id
213 make_var_id = make_id True
215 make_mid :: Module -> C.Id
216 make_mid = showSDoc . pprModule
218 make_qid :: Bool -> Name -> C.Qual C.Id
219 make_qid is_var n = (mname,make_id is_var n)
221 case nameModule_maybe n of
225 make_var_qid :: Name -> C.Qual C.Id
226 make_var_qid = make_qid True
228 make_con_qid :: Name -> C.Qual C.Id
229 make_con_qid = make_qid False