5 noV, tryV, maybeV, traceMaybeV, orElseV, fixV, localV, closedV, initV,
8 newExportedVar, newLocalVar, newDummyVar, newTyVar,
15 readGEnv, setGEnv, updGEnv,
18 readLEnv, setLEnv, updLEnv,
22 lookupVar, defGlobalVar,
23 lookupTyCon, defTyCon,
24 lookupDataCon, defDataCon,
25 lookupTyConPA, defTyConPA, defTyConPAs, defTyConBuiltinPAs,
26 lookupTyVarPA, defLocalTyVar, defLocalTyVarWithPA, localTyVars,
28 {-lookupInst,-} lookupFamInst
31 #include "HsVersions.h"
47 import TysPrim ( intPrimTy )
60 import SrcLoc ( noSrcSpan )
62 import Control.Monad ( liftM, zipWithM )
64 data Scope a b = Global a | Local b
66 -- ----------------------------------------------------------------------------
67 -- Vectorisation monad
69 data GlobalEnv = GlobalEnv {
70 -- Mapping from global variables to their vectorised versions.
72 global_vars :: VarEnv Var
74 -- Exported variables which have a vectorised version
76 , global_exported_vars :: VarEnv (Var, Var)
78 -- Mapping from TyCons to their vectorised versions.
79 -- TyCons which do not have to be vectorised are mapped to
82 , global_tycons :: NameEnv TyCon
84 -- Mapping from DataCons to their vectorised versions
86 , global_datacons :: NameEnv DataCon
88 -- Mapping from TyCons to their PA dfuns
90 , global_pa_funs :: NameEnv Var
92 -- External package inst-env & home-package inst-env for class
95 , global_inst_env :: (InstEnv, InstEnv)
97 -- External package inst-env & home-package inst-env for family
100 , global_fam_inst_env :: FamInstEnvs
103 , global_bindings :: [(Var, CoreExpr)]
106 data LocalEnv = LocalEnv {
107 -- Mapping from local variables to their vectorised and
110 local_vars :: VarEnv (Var, Var)
112 -- In-scope type variables
114 , local_tyvars :: [TyVar]
116 -- Mapping from tyvars to their PA dictionaries
117 , local_tyvar_pa :: VarEnv CoreExpr
119 -- Local binding name
120 , local_bind_name :: FastString
124 initGlobalEnv :: VectInfo -> (InstEnv, InstEnv) -> FamInstEnvs -> Builtins
126 initGlobalEnv info instEnvs famInstEnvs bi
128 global_vars = mapVarEnv snd $ vectInfoVar info
129 , global_exported_vars = emptyVarEnv
130 , global_tycons = extendNameEnv (mapNameEnv snd (vectInfoTyCon info))
131 (tyConName funTyCon) (closureTyCon bi)
133 , global_datacons = mapNameEnv snd $ vectInfoDataCon info
134 , global_pa_funs = mapNameEnv snd $ vectInfoPADFun info
135 , global_inst_env = instEnvs
136 , global_fam_inst_env = famInstEnvs
137 , global_bindings = []
140 setFamInstEnv :: FamInstEnv -> GlobalEnv -> GlobalEnv
141 setFamInstEnv l_fam_inst genv
142 = genv { global_fam_inst_env = (g_fam_inst, l_fam_inst) }
144 (g_fam_inst, _) = global_fam_inst_env genv
146 emptyLocalEnv = LocalEnv {
147 local_vars = emptyVarEnv
149 , local_tyvar_pa = emptyVarEnv
150 , local_bind_name = FSLIT("fn")
154 updVectInfo :: GlobalEnv -> TypeEnv -> VectInfo -> VectInfo
155 updVectInfo env tyenv info
157 vectInfoVar = global_exported_vars env
158 , vectInfoTyCon = mk_env typeEnvTyCons global_tycons
159 , vectInfoDataCon = mk_env typeEnvDataCons global_datacons
160 , vectInfoPADFun = mk_env typeEnvTyCons global_pa_funs
163 mk_env from_tyenv from_env = mkNameEnv [(name, (from,to))
164 | from <- from_tyenv tyenv
165 , let name = getName from
166 , Just to <- [lookupNameEnv (from_env env) name]]
168 data VResult a = Yes GlobalEnv LocalEnv a | No
170 newtype VM a = VM { runVM :: Builtins -> GlobalEnv -> LocalEnv -> DsM (VResult a) }
172 instance Monad VM where
173 return x = VM $ \bi genv lenv -> return (Yes genv lenv x)
174 VM p >>= f = VM $ \bi genv lenv -> do
177 Yes genv' lenv' x -> runVM (f x) bi genv' lenv'
181 noV = VM $ \_ _ _ -> return No
183 traceNoV :: String -> SDoc -> VM a
184 traceNoV s d = pprTrace s d noV
186 tryV :: VM a -> VM (Maybe a)
187 tryV (VM p) = VM $ \bi genv lenv ->
191 Yes genv' lenv' x -> return (Yes genv' lenv' (Just x))
192 No -> return (Yes genv lenv Nothing)
194 maybeV :: VM (Maybe a) -> VM a
195 maybeV p = maybe noV return =<< p
197 traceMaybeV :: String -> SDoc -> VM (Maybe a) -> VM a
198 traceMaybeV s d p = maybe (traceNoV s d) return =<< p
200 orElseV :: VM a -> VM a -> VM a
201 orElseV p q = maybe q return =<< tryV p
203 fixV :: (a -> VM a) -> VM a
204 fixV f = VM (\bi genv lenv -> fixDs $ \r -> runVM (f (unYes r)) bi genv lenv )
206 unYes (Yes _ _ x) = x
208 localV :: VM a -> VM a
215 closedV :: VM a -> VM a
218 setLEnv (emptyLocalEnv { local_bind_name = local_bind_name env })
223 liftDs :: DsM a -> VM a
224 liftDs p = VM $ \bi genv lenv -> do { x <- p; return (Yes genv lenv x) }
226 builtin :: (Builtins -> a) -> VM a
227 builtin f = VM $ \bi genv lenv -> return (Yes genv lenv (f bi))
229 readGEnv :: (GlobalEnv -> a) -> VM a
230 readGEnv f = VM $ \bi genv lenv -> return (Yes genv lenv (f genv))
232 setGEnv :: GlobalEnv -> VM ()
233 setGEnv genv = VM $ \_ _ lenv -> return (Yes genv lenv ())
235 updGEnv :: (GlobalEnv -> GlobalEnv) -> VM ()
236 updGEnv f = VM $ \_ genv lenv -> return (Yes (f genv) lenv ())
238 readLEnv :: (LocalEnv -> a) -> VM a
239 readLEnv f = VM $ \bi genv lenv -> return (Yes genv lenv (f lenv))
241 setLEnv :: LocalEnv -> VM ()
242 setLEnv lenv = VM $ \_ genv _ -> return (Yes genv lenv ())
244 updLEnv :: (LocalEnv -> LocalEnv) -> VM ()
245 updLEnv f = VM $ \_ genv lenv -> return (Yes genv (f lenv) ())
247 getInstEnv :: VM (InstEnv, InstEnv)
248 getInstEnv = readGEnv global_inst_env
250 getFamInstEnv :: VM FamInstEnvs
251 getFamInstEnv = readGEnv global_fam_inst_env
253 getBindName :: VM FastString
254 getBindName = readLEnv local_bind_name
256 inBind :: Id -> VM a -> VM a
258 = do updLEnv $ \env -> env { local_bind_name = occNameFS (getOccName id) }
261 lookupExternalVar :: Module -> FastString -> VM Var
262 lookupExternalVar mod fs
264 $ dsLookupGlobalId =<< lookupOrig mod (mkVarOccFS fs)
266 cloneName :: (OccName -> OccName) -> Name -> VM Name
267 cloneName mk_occ name = liftM make (liftDs newUnique)
269 occ_name = mk_occ (nameOccName name)
271 make u | isExternalName name = mkExternalName u (nameModule name)
274 | otherwise = mkSystemName u occ_name
276 cloneId :: (OccName -> OccName) -> Id -> Type -> VM Id
279 name <- cloneName mk_occ (getName id)
280 let id' | isExportedId id = Id.mkExportedLocalId name ty
281 | otherwise = Id.mkLocalId name ty
284 newExportedVar :: OccName -> Type -> VM Var
285 newExportedVar occ_name ty
287 mod <- liftDs getModuleDs
288 u <- liftDs newUnique
290 let name = mkExternalName u mod occ_name noSrcSpan
292 return $ Id.mkExportedLocalId name ty
294 newLocalVar :: FastString -> Type -> VM Var
297 u <- liftDs newUnique
298 return $ mkSysLocal fs u ty
300 newDummyVar :: Type -> VM Var
301 newDummyVar = newLocalVar FSLIT("ds")
303 newTyVar :: FastString -> Kind -> VM Var
306 u <- liftDs newUnique
307 return $ mkTyVar (mkSysTvName u fs) k
309 defGlobalVar :: Var -> Var -> VM ()
310 defGlobalVar v v' = updGEnv $ \env ->
311 env { global_vars = extendVarEnv (global_vars env) v v'
312 , global_exported_vars = upd (global_exported_vars env)
315 upd env | isExportedId v = extendVarEnv env v (v, v')
318 lookupVar :: Var -> VM (Scope Var (Var, Var))
321 r <- readLEnv $ \env -> lookupVarEnv (local_vars env) v
323 Just e -> return (Local e)
324 Nothing -> liftM Global
325 $ traceMaybeV "lookupVar" (ppr v)
326 (readGEnv $ \env -> lookupVarEnv (global_vars env) v)
328 lookupTyCon :: TyCon -> VM (Maybe TyCon)
330 | isUnLiftedTyCon tc || isTupleTyCon tc = return (Just tc)
332 | otherwise = readGEnv $ \env -> lookupNameEnv (global_tycons env) (tyConName tc)
334 defTyCon :: TyCon -> TyCon -> VM ()
335 defTyCon tc tc' = updGEnv $ \env ->
336 env { global_tycons = extendNameEnv (global_tycons env) (tyConName tc) tc' }
338 lookupDataCon :: DataCon -> VM (Maybe DataCon)
339 lookupDataCon dc = readGEnv $ \env -> lookupNameEnv (global_datacons env) (dataConName dc)
341 defDataCon :: DataCon -> DataCon -> VM ()
342 defDataCon dc dc' = updGEnv $ \env ->
343 env { global_datacons = extendNameEnv (global_datacons env) (dataConName dc) dc' }
345 lookupTyConPA :: TyCon -> VM (Maybe Var)
346 lookupTyConPA tc = readGEnv $ \env -> lookupNameEnv (global_pa_funs env) (tyConName tc)
348 defTyConPA :: TyCon -> Var -> VM ()
349 defTyConPA tc pa = updGEnv $ \env ->
350 env { global_pa_funs = extendNameEnv (global_pa_funs env) (tyConName tc) pa }
352 defTyConPAs :: [(TyCon, Var)] -> VM ()
353 defTyConPAs ps = updGEnv $ \env ->
354 env { global_pa_funs = extendNameEnvList (global_pa_funs env)
355 [(tyConName tc, pa) | (tc, pa) <- ps] }
357 defTyConBuiltinPAs :: [(Name, Module, FastString)] -> VM ()
358 defTyConBuiltinPAs ps
360 pas <- zipWithM lookupExternalVar mods fss
362 env { global_pa_funs = extendNameEnvList (global_pa_funs env)
365 (tcs, mods, fss) = unzip3 ps
367 lookupTyVarPA :: Var -> VM (Maybe CoreExpr)
368 lookupTyVarPA tv = readLEnv $ \env -> lookupVarEnv (local_tyvar_pa env) tv
370 defLocalTyVar :: TyVar -> VM ()
371 defLocalTyVar tv = updLEnv $ \env ->
372 env { local_tyvars = tv : local_tyvars env
373 , local_tyvar_pa = local_tyvar_pa env `delVarEnv` tv
376 defLocalTyVarWithPA :: TyVar -> CoreExpr -> VM ()
377 defLocalTyVarWithPA tv pa = updLEnv $ \env ->
378 env { local_tyvars = tv : local_tyvars env
379 , local_tyvar_pa = extendVarEnv (local_tyvar_pa env) tv pa
382 localTyVars :: VM [TyVar]
383 localTyVars = readLEnv (reverse . local_tyvars)
385 -- Look up the dfun of a class instance.
387 -- The match must be unique - ie, match exactly one instance - but the
388 -- type arguments used for matching may be more specific than those of
389 -- the class instance declaration. The found class instances must not have
390 -- any type variables in the instance context that do not appear in the
391 -- instances head (i.e., no flexi vars); for details for what this means,
392 -- see the docs at InstEnv.lookupInstEnv.
395 lookupInst :: Class -> [Type] -> VM (DFunId, [Type])
397 = do { instEnv <- getInstEnv
398 ; case lookupInstEnv instEnv cls tys of
399 ([(inst, inst_tys)], _)
400 | noFlexiVar -> return (instanceDFunId inst, inst_tys')
401 | otherwise -> pprPanic "VectMonad.lookupInst: flexi var: "
402 (ppr $ mkTyConApp (classTyCon cls) tys)
404 inst_tys' = [ty | Right ty <- inst_tys]
405 noFlexiVar = all isRight inst_tys
406 _other -> traceNoV "lookupInst" (ppr cls <+> ppr tys)
409 isRight (Left _) = False
410 isRight (Right _) = True
413 -- Look up the representation tycon of a family instance.
415 -- The match must be unique - ie, match exactly one instance - but the
416 -- type arguments used for matching may be more specific than those of
417 -- the family instance declaration.
419 -- Return the instance tycon and its type instance. For example, if we have
421 -- lookupFamInst 'T' '[Int]' yields (':R42T', 'Int')
423 -- then we have a coercion (ie, type instance of family instance coercion)
425 -- :Co:R42T Int :: T [Int] ~ :R42T Int
427 -- which implies that :R42T was declared as 'data instance T [a]'.
429 lookupFamInst :: TyCon -> [Type] -> VM (TyCon, [Type])
430 lookupFamInst tycon tys
431 = ASSERT( isOpenTyCon tycon )
432 do { instEnv <- getFamInstEnv
433 ; case lookupFamInstEnv instEnv tycon tys of
434 [(fam_inst, rep_tys)] -> return (famInstTyCon fam_inst, rep_tys)
436 pprPanic "VectMonad.lookupFamInst: not found: "
437 (ppr $ mkTyConApp tycon tys)
440 initV :: HscEnv -> ModGuts -> VectInfo -> VM a -> IO (Maybe (VectInfo, a))
441 initV hsc_env guts info p
443 eps <- hscEPS hsc_env
444 let famInstEnvs = (eps_fam_inst_env eps, mg_fam_inst_env guts)
445 let instEnvs = (eps_inst_env eps, mg_inst_env guts)
447 Just r <- initDs hsc_env (mg_module guts)
450 (go instEnvs famInstEnvs)
454 go instEnvs famInstEnvs =
456 builtins <- initBuiltins
457 r <- runVM p builtins (initGlobalEnv info
463 Yes genv _ x -> return $ Just (new_info genv, x)
466 new_info genv = updVectInfo genv (mg_types guts) info