5 noV, tryV, maybeV, orElseV, fixV, localV, closedV, initV,
6 cloneName, newExportedVar, newLocalVar, newDummyVar, newTyVar,
8 Builtins(..), paDictTyCon, paDictDataCon,
13 readGEnv, setGEnv, updGEnv,
16 readLEnv, setLEnv, updLEnv,
20 lookupVar, defGlobalVar,
21 lookupTyCon, defTyCon,
22 lookupDataCon, defDataCon,
23 lookupTyVarPA, defLocalTyVar, defLocalTyVarWithPA, localTyVars,
25 lookupInst, lookupFamInst
28 #include "HsVersions.h"
52 import SrcLoc ( noSrcSpan )
54 import Control.Monad ( liftM )
56 data Scope a b = Global a | Local b
58 -- ----------------------------------------------------------------------------
59 -- Vectorisation monad
61 data Builtins = Builtins {
64 , closureTyCon :: TyCon
66 , applyClosureVar :: Var
67 , mkClosurePVar :: Var
68 , applyClosurePVar :: Var
70 , replicatePAVar :: Var
74 paDictTyCon :: Builtins -> TyCon
75 paDictTyCon = classTyCon . paClass
77 paDictDataCon :: Builtins -> DataCon
78 paDictDataCon = classDataCon . paClass
80 initBuiltins :: DsM Builtins
83 parrayTyCon <- dsLookupTyCon parrayTyConName
84 paClass <- dsLookupClass paClassName
85 closureTyCon <- dsLookupTyCon closureTyConName
87 mkClosureVar <- dsLookupGlobalId mkClosureName
88 applyClosureVar <- dsLookupGlobalId applyClosureName
89 mkClosurePVar <- dsLookupGlobalId mkClosurePName
90 applyClosurePVar <- dsLookupGlobalId applyClosurePName
91 lengthPAVar <- dsLookupGlobalId lengthPAName
92 replicatePAVar <- dsLookupGlobalId replicatePAName
93 emptyPAVar <- dsLookupGlobalId emptyPAName
96 parrayTyCon = parrayTyCon
98 , closureTyCon = closureTyCon
99 , mkClosureVar = mkClosureVar
100 , applyClosureVar = applyClosureVar
101 , mkClosurePVar = mkClosurePVar
102 , applyClosurePVar = applyClosurePVar
103 , lengthPAVar = lengthPAVar
104 , replicatePAVar = replicatePAVar
105 , emptyPAVar = emptyPAVar
108 data GlobalEnv = GlobalEnv {
109 -- Mapping from global variables to their vectorised versions.
111 global_vars :: VarEnv Var
113 -- Exported variables which have a vectorised version
115 , global_exported_vars :: VarEnv (Var, Var)
117 -- Mapping from TyCons to their vectorised versions.
118 -- TyCons which do not have to be vectorised are mapped to
121 , global_tycons :: NameEnv TyCon
123 -- Mapping from DataCons to their vectorised versions
125 , global_datacons :: NameEnv DataCon
127 -- External package inst-env & home-package inst-env for class
130 , global_inst_env :: (InstEnv, InstEnv)
132 -- External package inst-env & home-package inst-env for family
135 , global_fam_inst_env :: FamInstEnvs
138 , global_bindings :: [(Var, CoreExpr)]
141 data LocalEnv = LocalEnv {
142 -- Mapping from local variables to their vectorised and
145 local_vars :: VarEnv (Var, Var)
147 -- In-scope type variables
149 , local_tyvars :: [TyVar]
151 -- Mapping from tyvars to their PA dictionaries
152 , local_tyvar_pa :: VarEnv CoreExpr
154 -- Local binding name
155 , local_bind_name :: FastString
159 initGlobalEnv :: VectInfo -> (InstEnv, InstEnv) -> FamInstEnvs -> Builtins -> GlobalEnv
160 initGlobalEnv info instEnvs famInstEnvs bi
162 global_vars = mapVarEnv snd $ vectInfoVar info
163 , global_exported_vars = emptyVarEnv
164 , global_tycons = extendNameEnv (mapNameEnv snd (vectInfoTyCon info))
165 (tyConName funTyCon) (closureTyCon bi)
167 , global_datacons = mapNameEnv snd $ vectInfoDataCon info
168 , global_inst_env = instEnvs
169 , global_fam_inst_env = famInstEnvs
170 , global_bindings = []
173 setInstEnvs :: InstEnv -> FamInstEnv -> GlobalEnv -> GlobalEnv
174 setInstEnvs l_inst l_fam_inst genv
175 | (g_inst, _) <- global_inst_env genv
176 , (g_fam_inst, _) <- global_fam_inst_env genv
177 = genv { global_inst_env = (g_inst, l_inst)
178 , global_fam_inst_env = (g_fam_inst, l_fam_inst) }
180 emptyLocalEnv = LocalEnv {
181 local_vars = emptyVarEnv
183 , local_tyvar_pa = emptyVarEnv
184 , local_bind_name = FSLIT("fn")
188 updVectInfo :: GlobalEnv -> TypeEnv -> VectInfo -> VectInfo
189 updVectInfo env tyenv info
191 vectInfoVar = global_exported_vars env
192 , vectInfoTyCon = mk_env typeEnvTyCons global_tycons
193 , vectInfoDataCon = mk_env typeEnvDataCons global_datacons
196 mk_env from_tyenv from_env = mkNameEnv [(name, (from,to))
197 | from <- from_tyenv tyenv
198 , let name = getName from
199 , Just to <- [lookupNameEnv (from_env env) name]]
201 data VResult a = Yes GlobalEnv LocalEnv a | No
203 newtype VM a = VM { runVM :: Builtins -> GlobalEnv -> LocalEnv -> DsM (VResult a) }
205 instance Monad VM where
206 return x = VM $ \bi genv lenv -> return (Yes genv lenv x)
207 VM p >>= f = VM $ \bi genv lenv -> do
210 Yes genv' lenv' x -> runVM (f x) bi genv' lenv'
214 noV = VM $ \_ _ _ -> return No
216 tryV :: VM a -> VM (Maybe a)
217 tryV (VM p) = VM $ \bi genv lenv ->
221 Yes genv' lenv' x -> return (Yes genv' lenv' (Just x))
222 No -> return (Yes genv lenv Nothing)
224 maybeV :: VM (Maybe a) -> VM a
225 maybeV p = maybe noV return =<< p
227 orElseV :: VM a -> VM a -> VM a
228 orElseV p q = maybe q return =<< tryV p
230 fixV :: (a -> VM a) -> VM a
231 fixV f = VM (\bi genv lenv -> fixDs $ \r -> runVM (f (unYes r)) bi genv lenv )
233 unYes (Yes _ _ x) = x
235 localV :: VM a -> VM a
242 closedV :: VM a -> VM a
245 setLEnv (emptyLocalEnv { local_bind_name = local_bind_name env })
250 liftDs :: DsM a -> VM a
251 liftDs p = VM $ \bi genv lenv -> do { x <- p; return (Yes genv lenv x) }
253 builtin :: (Builtins -> a) -> VM a
254 builtin f = VM $ \bi genv lenv -> return (Yes genv lenv (f bi))
256 readGEnv :: (GlobalEnv -> a) -> VM a
257 readGEnv f = VM $ \bi genv lenv -> return (Yes genv lenv (f genv))
259 setGEnv :: GlobalEnv -> VM ()
260 setGEnv genv = VM $ \_ _ lenv -> return (Yes genv lenv ())
262 updGEnv :: (GlobalEnv -> GlobalEnv) -> VM ()
263 updGEnv f = VM $ \_ genv lenv -> return (Yes (f genv) lenv ())
265 readLEnv :: (LocalEnv -> a) -> VM a
266 readLEnv f = VM $ \bi genv lenv -> return (Yes genv lenv (f lenv))
268 setLEnv :: LocalEnv -> VM ()
269 setLEnv lenv = VM $ \_ genv _ -> return (Yes genv lenv ())
271 updLEnv :: (LocalEnv -> LocalEnv) -> VM ()
272 updLEnv f = VM $ \_ genv lenv -> return (Yes genv (f lenv) ())
274 getInstEnv :: VM (InstEnv, InstEnv)
275 getInstEnv = readGEnv global_inst_env
277 getFamInstEnv :: VM FamInstEnvs
278 getFamInstEnv = readGEnv global_fam_inst_env
280 getBindName :: VM FastString
281 getBindName = readLEnv local_bind_name
283 inBind :: Id -> VM a -> VM a
285 = do updLEnv $ \env -> env { local_bind_name = occNameFS (getOccName id) }
288 cloneName :: (OccName -> OccName) -> Name -> VM Name
289 cloneName mk_occ name = liftM make (liftDs newUnique)
291 occ_name = mk_occ (nameOccName name)
293 make u | isExternalName name = mkExternalName u (nameModule name)
296 | otherwise = mkSystemName u occ_name
298 newExportedVar :: OccName -> Type -> VM Var
299 newExportedVar occ_name ty
301 mod <- liftDs getModuleDs
302 u <- liftDs newUnique
304 let name = mkExternalName u mod occ_name noSrcSpan
306 return $ Id.mkExportedLocalId name ty
308 newLocalVar :: FastString -> Type -> VM Var
311 u <- liftDs newUnique
312 return $ mkSysLocal fs u ty
314 newDummyVar :: Type -> VM Var
315 newDummyVar = newLocalVar FSLIT("ds")
317 newTyVar :: FastString -> Kind -> VM Var
320 u <- liftDs newUnique
321 return $ mkTyVar (mkSysTvName u fs) k
323 defGlobalVar :: Var -> Var -> VM ()
324 defGlobalVar v v' = updGEnv $ \env ->
325 env { global_vars = extendVarEnv (global_vars env) v v'
326 , global_exported_vars = upd (global_exported_vars env)
329 upd env | isExportedId v = extendVarEnv env v (v, v')
332 lookupVar :: Var -> VM (Scope Var (Var, Var))
335 r <- readLEnv $ \env -> lookupVarEnv (local_vars env) v
337 Just e -> return (Local e)
338 Nothing -> liftM Global
339 $ maybeV (readGEnv $ \env -> lookupVarEnv (global_vars env) v)
341 lookupTyCon :: TyCon -> VM (Maybe TyCon)
343 | isUnLiftedTyCon tc || isTupleTyCon tc = return (Just tc)
345 | otherwise = readGEnv $ \env -> lookupNameEnv (global_tycons env) (tyConName tc)
347 defTyCon :: TyCon -> TyCon -> VM ()
348 defTyCon tc tc' = updGEnv $ \env ->
349 env { global_tycons = extendNameEnv (global_tycons env) (tyConName tc) tc' }
351 lookupDataCon :: DataCon -> VM (Maybe DataCon)
352 lookupDataCon dc = readGEnv $ \env -> lookupNameEnv (global_datacons env) (dataConName dc)
354 defDataCon :: DataCon -> DataCon -> VM ()
355 defDataCon dc dc' = updGEnv $ \env ->
356 env { global_datacons = extendNameEnv (global_datacons env) (dataConName dc) dc' }
358 lookupTyVarPA :: Var -> VM (Maybe CoreExpr)
359 lookupTyVarPA tv = readLEnv $ \env -> lookupVarEnv (local_tyvar_pa env) tv
361 defLocalTyVar :: TyVar -> VM ()
362 defLocalTyVar tv = updLEnv $ \env ->
363 env { local_tyvars = tv : local_tyvars env
364 , local_tyvar_pa = local_tyvar_pa env `delVarEnv` tv
367 defLocalTyVarWithPA :: TyVar -> CoreExpr -> VM ()
368 defLocalTyVarWithPA tv pa = updLEnv $ \env ->
369 env { local_tyvars = tv : local_tyvars env
370 , local_tyvar_pa = extendVarEnv (local_tyvar_pa env) tv pa
373 localTyVars :: VM [TyVar]
374 localTyVars = readLEnv (reverse . local_tyvars)
376 -- Look up the dfun of a class instance.
378 -- The match must be unique - ie, match exactly one instance - but the
379 -- type arguments used for matching may be more specific than those of
380 -- the class instance declaration. The found class instances must not have
381 -- any type variables in the instance context that do not appear in the
382 -- instances head (i.e., no flexi vars); for details for what this means,
383 -- see the docs at InstEnv.lookupInstEnv.
385 lookupInst :: Class -> [Type] -> VM (DFunId, [Type])
387 = do { instEnv <- getInstEnv
388 ; case lookupInstEnv instEnv cls tys of
389 ([(inst, inst_tys)], _)
390 | noFlexiVar -> return (instanceDFunId inst, inst_tys')
391 | otherwise -> pprPanic "VectMonad.lookupInst: flexi var: "
392 (ppr $ mkTyConApp (classTyCon cls) tys)
394 inst_tys' = [ty | Right ty <- inst_tys]
395 noFlexiVar = all isRight inst_tys
399 isRight (Left _) = False
400 isRight (Right _) = True
402 -- Look up the representation tycon of a family instance.
404 -- The match must be unique - ie, match exactly one instance - but the
405 -- type arguments used for matching may be more specific than those of
406 -- the family instance declaration.
408 -- Return the instance tycon and its type instance. For example, if we have
410 -- lookupFamInst 'T' '[Int]' yields (':R42T', 'Int')
412 -- then we have a coercion (ie, type instance of family instance coercion)
414 -- :Co:R42T Int :: T [Int] ~ :R42T Int
416 -- which implies that :R42T was declared as 'data instance T [a]'.
418 lookupFamInst :: TyCon -> [Type] -> VM (TyCon, [Type])
419 lookupFamInst tycon tys
420 = ASSERT( isOpenTyCon tycon )
421 do { instEnv <- getFamInstEnv
422 ; case lookupFamInstEnv instEnv tycon tys of
423 [(fam_inst, rep_tys)] -> return (famInstTyCon fam_inst, rep_tys)
425 pprPanic "VectMonad.lookupFamInst: not found: "
426 (ppr $ mkTyConApp tycon tys)
429 initV :: HscEnv -> ModGuts -> VectInfo -> VM a -> IO (Maybe (VectInfo, a))
430 initV hsc_env guts info p
432 eps <- hscEPS hsc_env
433 let famInstEnvs = (eps_fam_inst_env eps, mg_fam_inst_env guts)
434 let instEnvs = (eps_inst_env eps, mg_inst_env guts)
436 Just r <- initDs hsc_env (mg_module guts)
439 (go instEnvs famInstEnvs)
443 go instEnvs famInstEnvs =
445 builtins <- initBuiltins
446 r <- runVM p builtins (initGlobalEnv info instEnvs famInstEnvs builtins)
449 Yes genv _ x -> return $ Just (new_info genv, x)
452 new_info genv = updVectInfo genv (mg_types guts) info