-%
-% (c) The University of Glasgow 2001
+
+% (c) The University of Glasgow 2001-2006
%
\begin{code}
-
module MkExternalCore (
emitExternalCore
) where
#include "HsVersions.h"
import qualified ExternalCore as C
-import Char
import Module
import CoreSyn
import HscTypes
import TyCon
+-- import Class
+-- import TysPrim( eqPredPrimTyCon )
import TypeRep
import Type
-import PprExternalCore -- Instances
-import DataCon ( DataCon, dataConTyVars, dataConRepArgTys,
- dataConName, dataConTyCon )
-import CoreSyn
+import PprExternalCore () -- Instances
+import DataCon
+import Coercion
import Var
import IdInfo
-import Kind
import Literal
import Name
import Outputable
+import Encoding
import ForeignCall
-import DynFlags ( DynFlags(..) )
-import StaticFlags ( opt_EmitExternalCore )
-import IO
+import DynFlags
import FastString
+import Exception
+
+import Data.Char
+import System.IO
emitExternalCore :: DynFlags -> CgGuts -> IO ()
emitExternalCore dflags cg_guts
- | opt_EmitExternalCore
+ | dopt Opt_EmitExternalCore dflags
= (do handle <- openFile corename WriteMode
- hPutStrLn handle (show (mkExternalCore cg_guts))
+ hPutStrLn handle (show (mkExternalCore cg_guts))
hClose handle)
- `catch` (\err -> pprPanic "Failed to open or write external core output file"
- (text corename))
+ `catchIO` (\_ -> pprPanic "Failed to open or write external core output file"
+ (text corename))
where corename = extCoreName dflags
emitExternalCore _ _
| otherwise
= return ()
+-- Reinventing the Reader monad; whee.
+newtype CoreM a = CoreM (CoreState -> (CoreState, a))
+type CoreState = Module
+instance Monad CoreM where
+ (CoreM m) >>= f = CoreM (\ s -> case m s of
+ (s',r) -> case f r of
+ CoreM f' -> f' s')
+ return x = CoreM (\ s -> (s, x))
+runCoreM :: CoreM a -> CoreState -> a
+runCoreM (CoreM f) s = snd $ f s
+ask :: CoreM CoreState
+ask = CoreM (\ s -> (s,s))
mkExternalCore :: CgGuts -> C.Module
-- The ModGuts has been tidied, but the implicit bindings have
-- not been injected, so we have to add them manually here
-- We don't include the strange data-con *workers* because they are
-- implicit in the data type declaration itself
-mkExternalCore (CgGuts {cg_module=this_mod, cg_tycons = tycons, cg_binds = binds})
- = C.Module mname tdefs (map make_vdef binds)
+mkExternalCore (CgGuts {cg_module=this_mod, cg_tycons = tycons,
+ cg_binds = binds})
+{- Note that modules can be mutually recursive, but even so, we
+ print out dependency information within each module. -}
+ = C.Module mname tdefs (runCoreM (mapM (make_vdef True) binds) this_mod)
where
mname = make_mid this_mod
tdefs = foldr collect_tdefs [] tycons
| isAlgTyCon tcon = tdef: tdefs
where
tdef | isNewTyCon tcon =
- C.Newtype (make_con_qid (tyConName tcon)) (map make_tbind tyvars) repclause
--- 20060420 GHC handles empty data types just fine. ExtCore should too! jds
--- | null (tyConDataCons tcon) = error "MkExternalCore died: can't handle datatype declarations with no data constructors"
+ C.Newtype (qtc tcon)
+ (qcc (newTyConCo tcon))
+ (map make_tbind tyvars)
+ (make_ty (snd (newTyConRhs tcon)))
| otherwise =
- C.Data (make_con_qid (tyConName tcon)) (map make_tbind tyvars) (map make_cdef (tyConDataCons tcon))
- where repclause | isRecursiveTyCon tcon = Nothing
- | otherwise = Just (make_ty rep)
- where (_, rep) = newTyConRep tcon
+ C.Data (qtc tcon) (map make_tbind tyvars)
+ (map make_cdef (tyConDataCons tcon))
tyvars = tyConTyVars tcon
collect_tdefs _ tdefs = tdefs
+qtc :: TyCon -> C.Qual C.Tcon
+qtc = make_con_qid . tyConName
+
+qcc :: CoAxiom -> C.Qual C.Tcon
+qcc = make_con_qid . co_ax_name
make_cdef :: DataCon -> C.Cdef
make_cdef dcon = C.Constr dcon_name existentials tys
where
- dcon_name = make_var_id (dataConName dcon)
+ dcon_name = make_qid False False (dataConName dcon)
existentials = map make_tbind ex_tyvars
- ex_tyvars = drop (tyConArity (dataConTyCon dcon)) (dataConTyVars dcon)
+ ex_tyvars = dataConExTyVars dcon
tys = map make_ty (dataConRepArgTys dcon)
make_tbind :: TyVar -> C.Tbind
make_tbind tv = (make_var_id (tyVarName tv), make_kind (tyVarKind tv))
make_vbind :: Var -> C.Vbind
-make_vbind v = (make_var_id (Var.varName v), make_ty (idType v))
+make_vbind v = (make_var_id (Var.varName v), make_ty (varType v))
-make_vdef :: CoreBind -> C.Vdefg
-make_vdef b =
+make_vdef :: Bool -> CoreBind -> CoreM C.Vdefg
+make_vdef topLevel b =
case b of
- NonRec v e -> C.Nonrec (f (v,e))
- Rec ves -> C.Rec (map f ves)
- where f (v,e) = (make_var_id (Var.varName v), make_ty (idType v),make_exp e)
- -- Top level bindings are unqualified now
-
-make_exp :: CoreExpr -> C.Exp
-make_exp (Var v) =
- case globalIdDetails v of
- -- a DataConId represents the Id of a worker, which is a varName. -- sof 4/02
--- DataConId _ -> C.Dcon (make_con_qid (Var.varName v))
- FCallId (CCall (CCallSpec (StaticTarget nm) _ _)) -> C.External (unpackFS nm) (make_ty (idType v))
- FCallId _ -> error "MkExternalCore died: can't handle non-static-C foreign call"
- _ -> C.Var (make_var_qid (Var.varName v))
-make_exp (Lit (l@(MachLabel s _))) = error "MkExternalCore died: can't handle \"foreign label\" declarations"
-make_exp (Lit l) = C.Lit (make_lit l)
-make_exp (App e (Type t)) = C.Appt (make_exp e) (make_ty t)
-make_exp (App e1 e2) = C.App (make_exp e1) (make_exp e2)
-make_exp (Lam v e) | isTyVar v = C.Lam (C.Tb (make_tbind v)) (make_exp e)
-make_exp (Lam v e) | otherwise = C.Lam (C.Vb (make_vbind v)) (make_exp e)
-make_exp (Let b e) = C.Let (make_vdef b) (make_exp e)
--- gaw 2004
-make_exp (Case e v ty alts) = C.Case (make_exp e) (make_vbind v) (make_ty ty) (map make_alt alts)
-make_exp (Note (SCC cc) e) = C.Note "SCC" (make_exp e) -- temporary
-make_exp (Note (Coerce t_to t_from) e) = C.Coerce (make_ty t_to) (make_exp e)
-make_exp (Note (CoreNote s) e) = C.Note s (make_exp e) -- hdaume: core annotations
-make_exp (Note InlineMe e) = C.Note "InlineMe" (make_exp e)
+ NonRec v e -> f (v,e) >>= (return . C.Nonrec)
+ Rec ves -> mapM f ves >>= (return . C.Rec)
+ where
+ f :: (CoreBndr,CoreExpr) -> CoreM C.Vdef
+ f (v,e) = do
+ localN <- isALocal vName
+ let local = not topLevel || localN
+ rhs <- make_exp e
+ -- use local flag to determine where to add the module name
+ return (local, make_qid local True vName, make_ty (varType v),rhs)
+ where vName = Var.varName v
+
+make_exp :: CoreExpr -> CoreM C.Exp
+make_exp (Var v) = do
+ let vName = Var.varName v
+ isLocal <- isALocal vName
+ return $
+ case idDetails v of
+ FCallId (CCall (CCallSpec (StaticTarget nm _) callconv _))
+ -> C.External (unpackFS nm) (showSDoc (ppr callconv)) (make_ty (varType v))
+ FCallId (CCall (CCallSpec DynamicTarget callconv _))
+ -> C.DynExternal (showSDoc (ppr callconv)) (make_ty (varType v))
+ -- Constructors are always exported, so make sure to declare them
+ -- with qualified names
+ DataConWorkId _ -> C.Var (make_var_qid False vName)
+ DataConWrapId _ -> C.Var (make_var_qid False vName)
+ _ -> C.Var (make_var_qid isLocal vName)
+make_exp (Lit (MachLabel s _ _)) = return $ C.Label (unpackFS s)
+make_exp (Lit l) = return $ C.Lit (make_lit l)
+make_exp (App e (Type t)) = make_exp e >>= (\ b -> return $ C.Appt b (make_ty t))
+make_exp (App _e (Coercion _co)) = error "make_exp (App _ (Coercion _))" -- TODO
+make_exp (App e1 e2) = do
+ rator <- make_exp e1
+ rand <- make_exp e2
+ return $ C.App rator rand
+make_exp (Lam v e) | isTyVar v = make_exp e >>= (\ b ->
+ return $ C.Lam (C.Tb (make_tbind v)) b)
+make_exp (Lam v e) | otherwise = make_exp e >>= (\ b ->
+ return $ C.Lam (C.Vb (make_vbind v)) b)
+make_exp (Cast e co) = make_exp e >>= (\ b -> return $ C.Cast b (make_co co))
+make_exp (Let b e) = do
+ vd <- make_vdef False b
+ body <- make_exp e
+ return $ C.Let vd body
+make_exp (Case e v ty alts) = do
+ scrut <- make_exp e
+ newAlts <- mapM make_alt alts
+ return $ C.Case scrut (make_vbind v) (make_ty ty) newAlts
+make_exp (Note (SCC _) e) = make_exp e >>= (return . C.Note "SCC") -- temporary
+make_exp (Note (CoreNote s) e) = make_exp e >>= (return . C.Note s) -- hdaume: core annotations
make_exp _ = error "MkExternalCore died: make_exp"
-make_alt :: CoreAlt -> C.Alt
-make_alt (DataAlt dcon, vs, e) =
- C.Acon (make_con_qid (dataConName dcon))
+make_alt :: CoreAlt -> CoreM C.Alt
+make_alt (DataAlt dcon, vs, e) = do
+ newE <- make_exp e
+ return $ C.Acon (make_con_qid (dataConName dcon))
(map make_tbind tbs)
(map make_vbind vbs)
- (make_exp e)
+ newE
where (tbs,vbs) = span isTyVar vs
-make_alt (LitAlt l,_,e) = C.Alit (make_lit l) (make_exp e)
-make_alt (DEFAULT,[],e) = C.Adefault (make_exp e)
+make_alt (LitAlt l,_,e) = make_exp e >>= (return . (C.Alit (make_lit l)))
+make_alt (DEFAULT,[],e) = make_exp e >>= (return . C.Adefault)
+-- This should never happen, as the DEFAULT alternative binds no variables,
+-- but we might as well check for it:
+make_alt a@(DEFAULT,_ ,_) = pprPanic ("MkExternalCore: make_alt: DEFAULT "
+ ++ "alternative had a non-empty var list") (ppr a)
+
make_lit :: Literal -> C.Lit
make_lit l =
case l of
- MachChar i -> C.Lchar i t
+ -- Note that we need to check whether the character is "big".
+ -- External Core only allows character literals up to '\xff'.
+ MachChar i | i <= chr 0xff -> C.Lchar i t
+ -- For a character bigger than 0xff, we represent it in ext-core
+ -- as an int lit with a char type.
+ MachChar i -> C.Lint (fromIntegral $ ord i) t
MachStr s -> C.Lstring (unpackFS s) t
MachNullAddr -> C.Lint 0 t
MachInt i -> C.Lint i t
where
t = make_ty (literalType l)
-make_ty :: Type -> C.Ty
-make_ty (TyVarTy tv) = C.Tvar (make_var_id (tyVarName tv))
-make_ty (AppTy t1 t2) = C.Tapp (make_ty t1) (make_ty t2)
-make_ty (FunTy t1 t2) = make_ty (TyConApp funTyCon [t1,t2])
-make_ty (ForAllTy tv t) = C.Tforall (make_tbind tv) (make_ty t)
-make_ty (TyConApp tc ts) = foldl C.Tapp (C.Tcon (make_con_qid (tyConName tc)))
- (map make_ty ts)
+-- Expand type synonyms, then convert.
+make_ty :: Type -> C.Ty -- Be sure to expand types recursively!
+ -- example: FilePath ~> String ~> [Char]
+make_ty t | Just expanded <- tcView t = make_ty expanded
+make_ty t = make_ty' t
+
+-- note calls to make_ty so as to expand types recursively
+make_ty' :: Type -> C.Ty
+make_ty' (TyVarTy tv) = C.Tvar (make_var_id (tyVarName tv))
+make_ty' (AppTy t1 t2) = C.Tapp (make_ty t1) (make_ty t2)
+make_ty' (FunTy t1 t2) = make_ty (TyConApp funTyCon [t1,t2])
+make_ty' (ForAllTy tv t) = C.Tforall (make_tbind tv) (make_ty t)
+make_ty' (TyConApp tc ts) = make_tyConApp tc ts
+
-- Newtypes are treated just like any other type constructor; not expanded
-- Reason: predTypeRep does substitution and, while substitution deals
-- correctly with name capture, it's only correct if you see the uniques!
-- expose the representation in interface files, which definitely isn't right.
-- Maybe CoreTidy should know whether to expand newtypes or not?
-make_ty (PredTy p) = make_ty (predTypeRep p)
-make_ty (NoteTy _ t) = make_ty t
-
+make_ty' (PredTy p) = make_ty (predTypeRep p)
+make_tyConApp :: TyCon -> [Type] -> C.Ty
+make_tyConApp tc ts =
+ foldl C.Tapp (C.Tcon (qtc tc))
+ (map make_ty ts)
make_kind :: Kind -> C.Kind
-make_kind (FunKind k1 k2) = C.Karrow (make_kind k1) (make_kind k2)
-make_kind LiftedTypeKind = C.Klifted
-make_kind UnliftedTypeKind = C.Kunlifted
-make_kind OpenTypeKind = C.Kopen
+make_kind (PredTy (EqPred t1 t2)) = C.Keq (make_ty t1) (make_ty t2)
+make_kind (FunTy k1 k2) = C.Karrow (make_kind k1) (make_kind k2)
+make_kind k
+ | isLiftedTypeKind k = C.Klifted
+ | isUnliftedTypeKind k = C.Kunlifted
+ | isOpenTypeKind k = C.Kopen
make_kind _ = error "MkExternalCore died: make_kind"
{- Id generation. -}
-{- Use encoded strings.
- Also, adjust casing to work around some badly-chosen internal names. -}
make_id :: Bool -> Name -> C.Id
-make_id is_var nm = (occNameString . nameOccName) nm
-
-{- SIMON thinks this stuff isn't necessary
-make_id is_var nm =
- case n of
- 'Z':cs | is_var -> 'z':cs
- 'z':cs | not is_var -> 'Z':cs
- c:cs | isUpper c && is_var -> 'z':'d':n
- c:cs | isLower c && (not is_var) -> 'Z':'d':n
- _ -> n
- where n = (occNameString . nameOccName) nm
--}
+-- include uniques for internal names in order to avoid name shadowing
+make_id _is_var nm = ((occNameString . nameOccName) nm)
+ ++ (if isInternalName nm then (show . nameUnique) nm else "")
make_var_id :: Name -> C.Id
make_var_id = make_id True
+-- It's important to encode the module name here, because in External Core,
+-- base:GHC.Base => base:GHCziBase
+-- We don't do this in pprExternalCore because we
+-- *do* want to keep the package name (we don't want baseZCGHCziBase,
+-- because that would just be ugly.)
+-- SIGH.
+-- We encode the package name as well.
make_mid :: Module -> C.Id
-make_mid = moduleString
-
-make_qid :: Bool -> Name -> C.Qual C.Id
-make_qid is_var n = (mname,make_id is_var n)
+-- Super ugly code, but I can't find anything else that does quite what I
+-- want (encodes the hierarchical module name without encoding the colon
+-- that separates the package name from it.)
+make_mid m = showSDoc $
+ (text $ zEncodeString $ packageIdString $ modulePackageId m)
+ <> text ":"
+ <> (pprEncoded $ pprModuleName $ moduleName m)
+ where pprEncoded = pprCode CStyle
+
+make_qid :: Bool -> Bool -> Name -> C.Qual C.Id
+make_qid force_unqual is_var n = (mname,make_id is_var n)
where mname =
case nameModule_maybe n of
- Just m -> make_mid m
- Nothing -> ""
+ Just m | not force_unqual -> make_mid m
+ _ -> ""
-make_var_qid :: Name -> C.Qual C.Id
-make_var_qid = make_qid True
+make_var_qid :: Bool -> Name -> C.Qual C.Id
+make_var_qid force_unqual = make_qid force_unqual True
make_con_qid :: Name -> C.Qual C.Id
-make_con_qid = make_qid False
-
+make_con_qid = make_qid False False
+
+make_co :: Coercion -> C.Ty
+make_co (Refl ty) = make_ty ty
+make_co (TyConAppCo tc cos) = make_conAppCo (qtc tc) cos
+make_co (AppCo c1 c2) = C.Tapp (make_co c1) (make_co c2)
+make_co (ForAllCo tv co) = C.Tforall (make_tbind tv) (make_co co)
+make_co (CoVarCo cv) = C.Tvar (make_var_id (coVarName cv))
+make_co (AxiomInstCo cc cos) = make_conAppCo (qcc cc) cos
+make_co (UnsafeCo t1 t2) = C.UnsafeCoercion (make_ty t1) (make_ty t2)
+make_co (SymCo co) = C.SymCoercion (make_co co)
+make_co (TransCo c1 c2) = C.TransCoercion (make_co c1) (make_co c2)
+make_co (NthCo d co) = C.NthCoercion d (make_co co)
+make_co (InstCo co ty) = C.InstCoercion (make_co co) (make_ty ty)
+
+-- Used for both tycon app coercions and axiom instantiations.
+make_conAppCo :: C.Qual C.Tcon -> [Coercion] -> C.Ty
+make_conAppCo con cos =
+ foldl C.Tapp (C.Tcon con)
+ (map make_co cos)
+
+-------
+isALocal :: Name -> CoreM Bool
+isALocal vName = do
+ modName <- ask
+ return $ case nameModule_maybe vName of
+ -- Not sure whether isInternalName corresponds to "local"ness
+ -- in the External Core sense; need to re-read the spec.
+ Just m | m == modName -> isInternalName vName
+ _ -> False
\end{code}
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