5 noV, tryV, maybeV, orElseV, fixV, localV, closedV, initV,
7 newExportedVar, newLocalVar, newDummyVar, newTyVar,
9 Builtins(..), paDictTyCon, paDictDataCon,
14 readGEnv, setGEnv, updGEnv,
17 readLEnv, setLEnv, updLEnv,
21 lookupVar, defGlobalVar,
22 lookupTyCon, defTyCon,
23 lookupDataCon, defDataCon,
24 lookupTyVarPA, defLocalTyVar, defLocalTyVarWithPA, localTyVars,
26 lookupInst, lookupFamInst
29 #include "HsVersions.h"
43 import TysPrim ( intPrimTy )
54 import SrcLoc ( noSrcSpan )
56 import Control.Monad ( liftM )
58 data Scope a b = Global a | Local b
60 -- ----------------------------------------------------------------------------
61 -- Vectorisation monad
63 data Builtins = Builtins {
66 , closureTyCon :: TyCon
68 , applyClosureVar :: Var
69 , mkClosurePVar :: Var
70 , applyClosurePVar :: Var
72 , replicatePAVar :: Var
74 , liftingContext :: Var
77 paDictTyCon :: Builtins -> TyCon
78 paDictTyCon = classTyCon . paClass
80 paDictDataCon :: Builtins -> DataCon
81 paDictDataCon = classDataCon . paClass
83 initBuiltins :: DsM Builtins
86 parrayTyCon <- dsLookupTyCon parrayTyConName
87 paClass <- dsLookupClass paClassName
88 closureTyCon <- dsLookupTyCon closureTyConName
90 mkClosureVar <- dsLookupGlobalId mkClosureName
91 applyClosureVar <- dsLookupGlobalId applyClosureName
92 mkClosurePVar <- dsLookupGlobalId mkClosurePName
93 applyClosurePVar <- dsLookupGlobalId applyClosurePName
94 lengthPAVar <- dsLookupGlobalId lengthPAName
95 replicatePAVar <- dsLookupGlobalId replicatePAName
96 emptyPAVar <- dsLookupGlobalId emptyPAName
98 liftingContext <- liftM (\u -> mkSysLocal FSLIT("lc") u intPrimTy)
102 parrayTyCon = parrayTyCon
104 , closureTyCon = closureTyCon
105 , mkClosureVar = mkClosureVar
106 , applyClosureVar = applyClosureVar
107 , mkClosurePVar = mkClosurePVar
108 , applyClosurePVar = applyClosurePVar
109 , lengthPAVar = lengthPAVar
110 , replicatePAVar = replicatePAVar
111 , emptyPAVar = emptyPAVar
112 , liftingContext = liftingContext
115 data GlobalEnv = GlobalEnv {
116 -- Mapping from global variables to their vectorised versions.
118 global_vars :: VarEnv Var
120 -- Exported variables which have a vectorised version
122 , global_exported_vars :: VarEnv (Var, Var)
124 -- Mapping from TyCons to their vectorised versions.
125 -- TyCons which do not have to be vectorised are mapped to
128 , global_tycons :: NameEnv TyCon
130 -- Mapping from DataCons to their vectorised versions
132 , global_datacons :: NameEnv DataCon
134 -- External package inst-env & home-package inst-env for class
137 , global_inst_env :: (InstEnv, InstEnv)
139 -- External package inst-env & home-package inst-env for family
142 , global_fam_inst_env :: FamInstEnvs
145 , global_bindings :: [(Var, CoreExpr)]
148 data LocalEnv = LocalEnv {
149 -- Mapping from local variables to their vectorised and
152 local_vars :: VarEnv (Var, Var)
154 -- In-scope type variables
156 , local_tyvars :: [TyVar]
158 -- Mapping from tyvars to their PA dictionaries
159 , local_tyvar_pa :: VarEnv CoreExpr
161 -- Local binding name
162 , local_bind_name :: FastString
166 initGlobalEnv :: VectInfo -> (InstEnv, InstEnv) -> FamInstEnvs -> Builtins -> GlobalEnv
167 initGlobalEnv info instEnvs famInstEnvs bi
169 global_vars = mapVarEnv snd $ vectInfoVar info
170 , global_exported_vars = emptyVarEnv
171 , global_tycons = extendNameEnv (mapNameEnv snd (vectInfoTyCon info))
172 (tyConName funTyCon) (closureTyCon bi)
174 , global_datacons = mapNameEnv snd $ vectInfoDataCon info
175 , global_inst_env = instEnvs
176 , global_fam_inst_env = famInstEnvs
177 , global_bindings = []
180 setInstEnvs :: InstEnv -> FamInstEnv -> GlobalEnv -> GlobalEnv
181 setInstEnvs l_inst l_fam_inst genv
182 | (g_inst, _) <- global_inst_env genv
183 , (g_fam_inst, _) <- global_fam_inst_env genv
184 = genv { global_inst_env = (g_inst, l_inst)
185 , global_fam_inst_env = (g_fam_inst, l_fam_inst) }
187 emptyLocalEnv = LocalEnv {
188 local_vars = emptyVarEnv
190 , local_tyvar_pa = emptyVarEnv
191 , local_bind_name = FSLIT("fn")
195 updVectInfo :: GlobalEnv -> TypeEnv -> VectInfo -> VectInfo
196 updVectInfo env tyenv info
198 vectInfoVar = global_exported_vars env
199 , vectInfoTyCon = mk_env typeEnvTyCons global_tycons
200 , vectInfoDataCon = mk_env typeEnvDataCons global_datacons
203 mk_env from_tyenv from_env = mkNameEnv [(name, (from,to))
204 | from <- from_tyenv tyenv
205 , let name = getName from
206 , Just to <- [lookupNameEnv (from_env env) name]]
208 data VResult a = Yes GlobalEnv LocalEnv a | No
210 newtype VM a = VM { runVM :: Builtins -> GlobalEnv -> LocalEnv -> DsM (VResult a) }
212 instance Monad VM where
213 return x = VM $ \bi genv lenv -> return (Yes genv lenv x)
214 VM p >>= f = VM $ \bi genv lenv -> do
217 Yes genv' lenv' x -> runVM (f x) bi genv' lenv'
221 noV = VM $ \_ _ _ -> return No
223 traceNoV :: String -> SDoc -> VM a
224 traceNoV s d = pprTrace s d noV
226 tryV :: VM a -> VM (Maybe a)
227 tryV (VM p) = VM $ \bi genv lenv ->
231 Yes genv' lenv' x -> return (Yes genv' lenv' (Just x))
232 No -> return (Yes genv lenv Nothing)
234 maybeV :: VM (Maybe a) -> VM a
235 maybeV p = maybe noV return =<< p
237 traceMaybeV :: String -> SDoc -> VM (Maybe a) -> VM a
238 traceMaybeV s d p = maybe (traceNoV s d) return =<< p
240 orElseV :: VM a -> VM a -> VM a
241 orElseV p q = maybe q return =<< tryV p
243 fixV :: (a -> VM a) -> VM a
244 fixV f = VM (\bi genv lenv -> fixDs $ \r -> runVM (f (unYes r)) bi genv lenv )
246 unYes (Yes _ _ x) = x
248 localV :: VM a -> VM a
255 closedV :: VM a -> VM a
258 setLEnv (emptyLocalEnv { local_bind_name = local_bind_name env })
263 liftDs :: DsM a -> VM a
264 liftDs p = VM $ \bi genv lenv -> do { x <- p; return (Yes genv lenv x) }
266 builtin :: (Builtins -> a) -> VM a
267 builtin f = VM $ \bi genv lenv -> return (Yes genv lenv (f bi))
269 readGEnv :: (GlobalEnv -> a) -> VM a
270 readGEnv f = VM $ \bi genv lenv -> return (Yes genv lenv (f genv))
272 setGEnv :: GlobalEnv -> VM ()
273 setGEnv genv = VM $ \_ _ lenv -> return (Yes genv lenv ())
275 updGEnv :: (GlobalEnv -> GlobalEnv) -> VM ()
276 updGEnv f = VM $ \_ genv lenv -> return (Yes (f genv) lenv ())
278 readLEnv :: (LocalEnv -> a) -> VM a
279 readLEnv f = VM $ \bi genv lenv -> return (Yes genv lenv (f lenv))
281 setLEnv :: LocalEnv -> VM ()
282 setLEnv lenv = VM $ \_ genv _ -> return (Yes genv lenv ())
284 updLEnv :: (LocalEnv -> LocalEnv) -> VM ()
285 updLEnv f = VM $ \_ genv lenv -> return (Yes genv (f lenv) ())
287 getInstEnv :: VM (InstEnv, InstEnv)
288 getInstEnv = readGEnv global_inst_env
290 getFamInstEnv :: VM FamInstEnvs
291 getFamInstEnv = readGEnv global_fam_inst_env
293 getBindName :: VM FastString
294 getBindName = readLEnv local_bind_name
296 inBind :: Id -> VM a -> VM a
298 = do updLEnv $ \env -> env { local_bind_name = occNameFS (getOccName id) }
301 cloneName :: (OccName -> OccName) -> Name -> VM Name
302 cloneName mk_occ name = liftM make (liftDs newUnique)
304 occ_name = mk_occ (nameOccName name)
306 make u | isExternalName name = mkExternalName u (nameModule name)
309 | otherwise = mkSystemName u occ_name
311 cloneId :: (OccName -> OccName) -> Id -> Type -> VM Id
314 name <- cloneName mk_occ (getName id)
315 let id' | isExportedId id = Id.mkExportedLocalId name ty
316 | otherwise = Id.mkLocalId name ty
319 newExportedVar :: OccName -> Type -> VM Var
320 newExportedVar occ_name ty
322 mod <- liftDs getModuleDs
323 u <- liftDs newUnique
325 let name = mkExternalName u mod occ_name noSrcSpan
327 return $ Id.mkExportedLocalId name ty
329 newLocalVar :: FastString -> Type -> VM Var
332 u <- liftDs newUnique
333 return $ mkSysLocal fs u ty
335 newDummyVar :: Type -> VM Var
336 newDummyVar = newLocalVar FSLIT("ds")
338 newTyVar :: FastString -> Kind -> VM Var
341 u <- liftDs newUnique
342 return $ mkTyVar (mkSysTvName u fs) k
344 defGlobalVar :: Var -> Var -> VM ()
345 defGlobalVar v v' = updGEnv $ \env ->
346 env { global_vars = extendVarEnv (global_vars env) v v'
347 , global_exported_vars = upd (global_exported_vars env)
350 upd env | isExportedId v = extendVarEnv env v (v, v')
353 lookupVar :: Var -> VM (Scope Var (Var, Var))
356 r <- readLEnv $ \env -> lookupVarEnv (local_vars env) v
358 Just e -> return (Local e)
359 Nothing -> liftM Global
360 $ traceMaybeV "lookupVar" (ppr v)
361 (readGEnv $ \env -> lookupVarEnv (global_vars env) v)
363 lookupTyCon :: TyCon -> VM (Maybe TyCon)
365 | isUnLiftedTyCon tc || isTupleTyCon tc = return (Just tc)
367 | otherwise = readGEnv $ \env -> lookupNameEnv (global_tycons env) (tyConName tc)
369 defTyCon :: TyCon -> TyCon -> VM ()
370 defTyCon tc tc' = updGEnv $ \env ->
371 env { global_tycons = extendNameEnv (global_tycons env) (tyConName tc) tc' }
373 lookupDataCon :: DataCon -> VM (Maybe DataCon)
374 lookupDataCon dc = readGEnv $ \env -> lookupNameEnv (global_datacons env) (dataConName dc)
376 defDataCon :: DataCon -> DataCon -> VM ()
377 defDataCon dc dc' = updGEnv $ \env ->
378 env { global_datacons = extendNameEnv (global_datacons env) (dataConName dc) dc' }
380 lookupTyVarPA :: Var -> VM (Maybe CoreExpr)
381 lookupTyVarPA tv = readLEnv $ \env -> lookupVarEnv (local_tyvar_pa env) tv
383 defLocalTyVar :: TyVar -> VM ()
384 defLocalTyVar tv = updLEnv $ \env ->
385 env { local_tyvars = tv : local_tyvars env
386 , local_tyvar_pa = local_tyvar_pa env `delVarEnv` tv
389 defLocalTyVarWithPA :: TyVar -> CoreExpr -> VM ()
390 defLocalTyVarWithPA tv pa = updLEnv $ \env ->
391 env { local_tyvars = tv : local_tyvars env
392 , local_tyvar_pa = extendVarEnv (local_tyvar_pa env) tv pa
395 localTyVars :: VM [TyVar]
396 localTyVars = readLEnv (reverse . local_tyvars)
398 -- Look up the dfun of a class instance.
400 -- The match must be unique - ie, match exactly one instance - but the
401 -- type arguments used for matching may be more specific than those of
402 -- the class instance declaration. The found class instances must not have
403 -- any type variables in the instance context that do not appear in the
404 -- instances head (i.e., no flexi vars); for details for what this means,
405 -- see the docs at InstEnv.lookupInstEnv.
407 lookupInst :: Class -> [Type] -> VM (DFunId, [Type])
409 = do { instEnv <- getInstEnv
410 ; case lookupInstEnv instEnv cls tys of
411 ([(inst, inst_tys)], _)
412 | noFlexiVar -> return (instanceDFunId inst, inst_tys')
413 | otherwise -> pprPanic "VectMonad.lookupInst: flexi var: "
414 (ppr $ mkTyConApp (classTyCon cls) tys)
416 inst_tys' = [ty | Right ty <- inst_tys]
417 noFlexiVar = all isRight inst_tys
418 _other -> traceNoV "lookupInst" (ppr cls <+> ppr tys)
421 isRight (Left _) = False
422 isRight (Right _) = True
424 -- Look up the representation tycon of a family instance.
426 -- The match must be unique - ie, match exactly one instance - but the
427 -- type arguments used for matching may be more specific than those of
428 -- the family instance declaration.
430 -- Return the instance tycon and its type instance. For example, if we have
432 -- lookupFamInst 'T' '[Int]' yields (':R42T', 'Int')
434 -- then we have a coercion (ie, type instance of family instance coercion)
436 -- :Co:R42T Int :: T [Int] ~ :R42T Int
438 -- which implies that :R42T was declared as 'data instance T [a]'.
440 lookupFamInst :: TyCon -> [Type] -> VM (TyCon, [Type])
441 lookupFamInst tycon tys
442 = ASSERT( isOpenTyCon tycon )
443 do { instEnv <- getFamInstEnv
444 ; case lookupFamInstEnv instEnv tycon tys of
445 [(fam_inst, rep_tys)] -> return (famInstTyCon fam_inst, rep_tys)
447 pprPanic "VectMonad.lookupFamInst: not found: "
448 (ppr $ mkTyConApp tycon tys)
451 initV :: HscEnv -> ModGuts -> VectInfo -> VM a -> IO (Maybe (VectInfo, a))
452 initV hsc_env guts info p
454 eps <- hscEPS hsc_env
455 let famInstEnvs = (eps_fam_inst_env eps, mg_fam_inst_env guts)
456 let instEnvs = (eps_inst_env eps, mg_inst_env guts)
458 Just r <- initDs hsc_env (mg_module guts)
461 (go instEnvs famInstEnvs)
465 go instEnvs famInstEnvs =
467 builtins <- initBuiltins
468 r <- runVM p builtins (initGlobalEnv info instEnvs famInstEnvs builtins)
471 Yes genv _ x -> return $ Just (new_info genv, x)
474 new_info genv = updVectInfo genv (mg_types guts) info