5 noV, tryV, maybeV, orElseV, fixV, localV, closedV, initV,
6 cloneName, newLocalVar, newTyVar,
8 Builtins(..), paDictTyCon,
12 readGEnv, setGEnv, updGEnv,
15 readLEnv, setLEnv, updLEnv,
17 lookupVar, defGlobalVar,
18 lookupTyCon, defTyCon,
19 lookupDataCon, defDataCon,
20 lookupTyVarPA, defLocalTyVar, defLocalTyVarWithPA, localTyVars,
22 lookupInst, lookupFamInst
25 #include "HsVersions.h"
50 import Control.Monad ( liftM )
52 data Scope a b = Global a | Local b
54 -- ----------------------------------------------------------------------------
55 -- Vectorisation monad
57 data Builtins = Builtins {
60 , closureTyCon :: TyCon
62 , applyClosureVar :: Var
63 , mkClosurePVar :: Var
64 , applyClosurePVar :: Var
66 , replicatePAVar :: Var
69 paDictTyCon :: Builtins -> TyCon
70 paDictTyCon = classTyCon . paClass
72 initBuiltins :: DsM Builtins
75 parrayTyCon <- dsLookupTyCon parrayTyConName
76 paClass <- dsLookupClass paClassName
77 closureTyCon <- dsLookupTyCon closureTyConName
79 mkClosureVar <- dsLookupGlobalId mkClosureName
80 applyClosureVar <- dsLookupGlobalId applyClosureName
81 mkClosurePVar <- dsLookupGlobalId mkClosurePName
82 applyClosurePVar <- dsLookupGlobalId applyClosurePName
83 lengthPAVar <- dsLookupGlobalId lengthPAName
84 replicatePAVar <- dsLookupGlobalId replicatePAName
87 parrayTyCon = parrayTyCon
89 , closureTyCon = closureTyCon
90 , mkClosureVar = mkClosureVar
91 , applyClosureVar = applyClosureVar
92 , mkClosurePVar = mkClosurePVar
93 , applyClosurePVar = applyClosurePVar
94 , lengthPAVar = lengthPAVar
95 , replicatePAVar = replicatePAVar
98 data GlobalEnv = GlobalEnv {
99 -- Mapping from global variables to their vectorised versions.
101 global_vars :: VarEnv CoreExpr
103 -- Exported variables which have a vectorised version
105 , global_exported_vars :: VarEnv (Var, Var)
107 -- Mapping from TyCons to their vectorised versions.
108 -- TyCons which do not have to be vectorised are mapped to
111 , global_tycons :: NameEnv TyCon
113 -- Mapping from DataCons to their vectorised versions
115 , global_datacons :: NameEnv DataCon
117 -- External package inst-env & home-package inst-env for class
120 , global_inst_env :: (InstEnv, InstEnv)
122 -- External package inst-env & home-package inst-env for family
125 , global_fam_inst_env :: FamInstEnvs
128 , global_bindings :: [(Var, CoreExpr)]
131 data LocalEnv = LocalEnv {
132 -- Mapping from local variables to their vectorised and
135 local_vars :: VarEnv (CoreExpr, CoreExpr)
137 -- In-scope type variables
139 , local_tyvars :: [TyVar]
141 -- Mapping from tyvars to their PA dictionaries
142 , local_tyvar_pa :: VarEnv CoreExpr
146 initGlobalEnv :: VectInfo -> (InstEnv, InstEnv) -> FamInstEnvs -> GlobalEnv
147 initGlobalEnv info instEnvs famInstEnvs
149 global_vars = mapVarEnv (Var . snd) $ vectInfoVar info
150 , global_exported_vars = emptyVarEnv
151 , global_tycons = mapNameEnv snd $ vectInfoTyCon info
152 , global_datacons = mapNameEnv snd $ vectInfoDataCon info
153 , global_inst_env = instEnvs
154 , global_fam_inst_env = famInstEnvs
155 , global_bindings = []
158 emptyLocalEnv = LocalEnv {
159 local_vars = emptyVarEnv
161 , local_tyvar_pa = emptyVarEnv
165 updVectInfo :: GlobalEnv -> TypeEnv -> VectInfo -> VectInfo
166 updVectInfo env tyenv info
168 vectInfoVar = global_exported_vars env
169 , vectInfoTyCon = mk_env typeEnvTyCons global_tycons
170 , vectInfoDataCon = mk_env typeEnvDataCons global_datacons
173 mk_env from_tyenv from_env = mkNameEnv [(name, (from,to))
174 | from <- from_tyenv tyenv
175 , let name = getName from
176 , Just to <- [lookupNameEnv (from_env env) name]]
178 data VResult a = Yes GlobalEnv LocalEnv a | No
180 newtype VM a = VM { runVM :: Builtins -> GlobalEnv -> LocalEnv -> DsM (VResult a) }
182 instance Monad VM where
183 return x = VM $ \bi genv lenv -> return (Yes genv lenv x)
184 VM p >>= f = VM $ \bi genv lenv -> do
187 Yes genv' lenv' x -> runVM (f x) bi genv' lenv'
191 noV = VM $ \_ _ _ -> return No
193 tryV :: VM a -> VM (Maybe a)
194 tryV (VM p) = VM $ \bi genv lenv ->
198 Yes genv' lenv' x -> return (Yes genv' lenv' (Just x))
199 No -> return (Yes genv lenv Nothing)
201 maybeV :: VM (Maybe a) -> VM a
202 maybeV p = maybe noV return =<< p
204 orElseV :: VM a -> VM a -> VM a
205 orElseV p q = maybe q return =<< tryV p
207 fixV :: (a -> VM a) -> VM a
208 fixV f = VM (\bi genv lenv -> fixDs $ \r -> runVM (f (unYes r)) bi genv lenv )
210 unYes (Yes _ _ x) = x
212 localV :: VM a -> VM a
219 closedV :: VM a -> VM a
222 setLEnv emptyLocalEnv
227 liftDs :: DsM a -> VM a
228 liftDs p = VM $ \bi genv lenv -> do { x <- p; return (Yes genv lenv x) }
230 builtin :: (Builtins -> a) -> VM a
231 builtin f = VM $ \bi genv lenv -> return (Yes genv lenv (f bi))
233 readGEnv :: (GlobalEnv -> a) -> VM a
234 readGEnv f = VM $ \bi genv lenv -> return (Yes genv lenv (f genv))
236 setGEnv :: GlobalEnv -> VM ()
237 setGEnv genv = VM $ \_ _ lenv -> return (Yes genv lenv ())
239 updGEnv :: (GlobalEnv -> GlobalEnv) -> VM ()
240 updGEnv f = VM $ \_ genv lenv -> return (Yes (f genv) lenv ())
242 readLEnv :: (LocalEnv -> a) -> VM a
243 readLEnv f = VM $ \bi genv lenv -> return (Yes genv lenv (f lenv))
245 setLEnv :: LocalEnv -> VM ()
246 setLEnv lenv = VM $ \_ genv _ -> return (Yes genv lenv ())
248 updLEnv :: (LocalEnv -> LocalEnv) -> VM ()
249 updLEnv f = VM $ \_ genv lenv -> return (Yes genv (f lenv) ())
251 getInstEnv :: VM (InstEnv, InstEnv)
252 getInstEnv = readGEnv global_inst_env
254 getFamInstEnv :: VM FamInstEnvs
255 getFamInstEnv = readGEnv global_fam_inst_env
257 cloneName :: (OccName -> OccName) -> Name -> VM Name
258 cloneName mk_occ name = liftM make (liftDs newUnique)
260 occ_name = mk_occ (nameOccName name)
262 make u | isExternalName name = mkExternalName u (nameModule name)
265 | otherwise = mkSystemName u occ_name
267 newLocalVar :: FastString -> Type -> VM Var
270 u <- liftDs newUnique
271 return $ mkSysLocal fs u ty
273 newTyVar :: FastString -> Kind -> VM Var
276 u <- liftDs newUnique
277 return $ mkTyVar (mkSysTvName u fs) k
279 defGlobalVar :: Var -> Var -> VM ()
280 defGlobalVar v v' = updGEnv $ \env ->
281 env { global_vars = extendVarEnv (global_vars env) v (Var v')
282 , global_exported_vars = upd (global_exported_vars env)
285 upd env | isExportedId v = extendVarEnv env v (v, v')
288 lookupVar :: Var -> VM (Scope CoreExpr (CoreExpr, CoreExpr))
291 r <- readLEnv $ \env -> lookupVarEnv (local_vars env) v
293 Just e -> return (Local e)
294 Nothing -> liftM Global
295 $ maybeV (readGEnv $ \env -> lookupVarEnv (global_vars env) v)
297 lookupTyCon :: TyCon -> VM (Maybe TyCon)
298 lookupTyCon tc = readGEnv $ \env -> lookupNameEnv (global_tycons env) (tyConName tc)
300 defTyCon :: TyCon -> TyCon -> VM ()
301 defTyCon tc tc' = updGEnv $ \env ->
302 env { global_tycons = extendNameEnv (global_tycons env) (tyConName tc) tc' }
304 lookupDataCon :: DataCon -> VM (Maybe DataCon)
305 lookupDataCon dc = readGEnv $ \env -> lookupNameEnv (global_datacons env) (dataConName dc)
307 defDataCon :: DataCon -> DataCon -> VM ()
308 defDataCon dc dc' = updGEnv $ \env ->
309 env { global_datacons = extendNameEnv (global_datacons env) (dataConName dc) dc' }
311 lookupTyVarPA :: Var -> VM (Maybe CoreExpr)
312 lookupTyVarPA tv = readLEnv $ \env -> lookupVarEnv (local_tyvar_pa env) tv
314 defLocalTyVar :: TyVar -> VM ()
315 defLocalTyVar tv = updLEnv $ \env ->
316 env { local_tyvars = tv : local_tyvars env
317 , local_tyvar_pa = local_tyvar_pa env `delVarEnv` tv
320 defLocalTyVarWithPA :: TyVar -> CoreExpr -> VM ()
321 defLocalTyVarWithPA tv pa = updLEnv $ \env ->
322 env { local_tyvars = tv : local_tyvars env
323 , local_tyvar_pa = extendVarEnv (local_tyvar_pa env) tv pa
326 localTyVars :: VM [TyVar]
327 localTyVars = readLEnv (reverse . local_tyvars)
329 -- Look up the dfun of a class instance.
331 -- The match must be unique - ie, match exactly one instance - but the
332 -- type arguments used for matching may be more specific than those of
333 -- the class instance declaration. The found class instances must not have
334 -- any type variables in the instance context that do not appear in the
335 -- instances head (i.e., no flexi vars); for details for what this means,
336 -- see the docs at InstEnv.lookupInstEnv.
338 lookupInst :: Class -> [Type] -> VM (DFunId, [Type])
340 = do { instEnv <- getInstEnv
341 ; case lookupInstEnv instEnv cls tys of
342 ([(inst, inst_tys)], _)
343 | noFlexiVar -> return (instanceDFunId inst, inst_tys')
344 | otherwise -> pprPanic "VectMonad.lookupInst: flexi var: "
345 (ppr $ mkTyConApp (classTyCon cls) tys)
347 inst_tys' = [ty | Right ty <- inst_tys]
348 noFlexiVar = all isRight inst_tys
352 isRight (Left _) = False
353 isRight (Right _) = True
355 -- Look up the representation tycon of a family instance.
357 -- The match must be unique - ie, match exactly one instance - but the
358 -- type arguments used for matching may be more specific than those of
359 -- the family instance declaration.
361 -- Return the instance tycon and its type instance. For example, if we have
363 -- lookupFamInst 'T' '[Int]' yields (':R42T', 'Int')
365 -- then we have a coercion (ie, type instance of family instance coercion)
367 -- :Co:R42T Int :: T [Int] ~ :R42T Int
369 -- which implies that :R42T was declared as 'data instance T [a]'.
371 lookupFamInst :: TyCon -> [Type] -> VM (TyCon, [Type])
372 lookupFamInst tycon tys
373 = ASSERT( isOpenTyCon tycon )
374 do { instEnv <- getFamInstEnv
375 ; case lookupFamInstEnv instEnv tycon tys of
376 [(fam_inst, rep_tys)] -> return (famInstTyCon fam_inst, rep_tys)
378 pprPanic "VectMonad.lookupFamInst: not found: "
379 (ppr $ mkTyConApp tycon tys)
382 initV :: HscEnv -> ModGuts -> VectInfo -> VM a -> IO (Maybe (VectInfo, a))
383 initV hsc_env guts info p
385 eps <- hscEPS hsc_env
386 let famInstEnvs = (eps_fam_inst_env eps, mg_fam_inst_env guts)
387 let instEnvs = (eps_inst_env eps, mg_inst_env guts)
389 Just r <- initDs hsc_env (mg_module guts)
392 (go instEnvs famInstEnvs)
396 go instEnvs famInstEnvs =
398 builtins <- initBuiltins
399 r <- runVM p builtins (initGlobalEnv info instEnvs famInstEnvs)
402 Yes genv _ x -> return $ Just (new_info genv, x)
405 new_info genv = updVectInfo genv (mg_types guts) info