5 noV, tryV, maybeV, orElseV, localV, closedV, initV,
6 cloneName, newLocalVar, newTyVar,
8 Builtins(..), paDictTyCon,
12 readGEnv, setGEnv, updGEnv,
15 readLEnv, setLEnv, updLEnv,
17 defGlobalVar, lookupVar,
19 lookupTyVarPA, extendTyVarPA, deleteTyVarPA,
21 lookupInst, lookupFamInst
24 #include "HsVersions.h"
48 import Control.Monad ( liftM )
50 data Scope a b = Global a | Local b
52 -- ----------------------------------------------------------------------------
53 -- Vectorisation monad
55 data Builtins = Builtins {
58 , closureTyCon :: TyCon
60 , applyClosureVar :: Var
61 , mkClosurePVar :: Var
62 , applyClosurePVar :: Var
64 , replicatePAVar :: Var
67 paDictTyCon :: Builtins -> TyCon
68 paDictTyCon = classTyCon . paClass
70 initBuiltins :: DsM Builtins
73 parrayTyCon <- dsLookupTyCon parrayTyConName
74 paClass <- dsLookupClass paClassName
75 closureTyCon <- dsLookupTyCon closureTyConName
77 mkClosureVar <- dsLookupGlobalId mkClosureName
78 applyClosureVar <- dsLookupGlobalId applyClosureName
79 mkClosurePVar <- dsLookupGlobalId mkClosurePName
80 applyClosurePVar <- dsLookupGlobalId applyClosurePName
81 lengthPAVar <- dsLookupGlobalId lengthPAName
82 replicatePAVar <- dsLookupGlobalId replicatePAName
85 parrayTyCon = parrayTyCon
87 , closureTyCon = closureTyCon
88 , mkClosureVar = mkClosureVar
89 , applyClosureVar = applyClosureVar
90 , mkClosurePVar = mkClosurePVar
91 , applyClosurePVar = applyClosurePVar
92 , lengthPAVar = lengthPAVar
93 , replicatePAVar = replicatePAVar
96 data GlobalEnv = GlobalEnv {
97 -- Mapping from global variables to their vectorised versions.
99 global_vars :: VarEnv CoreExpr
101 -- Exported variables which have a vectorised version
103 , global_exported_vars :: VarEnv (Var, Var)
105 -- Mapping from TyCons to their vectorised versions.
106 -- TyCons which do not have to be vectorised are mapped to
109 , global_tycons :: NameEnv TyCon
111 -- Mapping from TyCons to their PA dictionaries
113 , global_tycon_pa :: NameEnv CoreExpr
115 -- External package inst-env & home-package inst-env for class
118 , global_inst_env :: (InstEnv, InstEnv)
120 -- External package inst-env & home-package inst-env for family
123 , global_fam_inst_env :: FamInstEnvs
126 , global_bindings :: [(Var, CoreExpr)]
129 data LocalEnv = LocalEnv {
130 -- Mapping from local variables to their vectorised and
133 local_vars :: VarEnv (CoreExpr, CoreExpr)
135 -- Mapping from tyvars to their PA dictionaries
136 , local_tyvar_pa :: VarEnv CoreExpr
140 initGlobalEnv :: VectInfo -> (InstEnv, InstEnv) -> FamInstEnvs -> GlobalEnv
141 initGlobalEnv info instEnvs famInstEnvs
143 global_vars = mapVarEnv (Var . snd) $ vectInfoVar info
144 , global_exported_vars = emptyVarEnv
145 , global_tycons = mapNameEnv snd $ vectInfoTyCon info
146 , global_tycon_pa = emptyNameEnv
147 , global_inst_env = instEnvs
148 , global_fam_inst_env = famInstEnvs
149 , global_bindings = []
152 emptyLocalEnv = LocalEnv {
153 local_vars = emptyVarEnv
154 , local_tyvar_pa = emptyVarEnv
158 updVectInfo :: GlobalEnv -> TypeEnv -> VectInfo -> VectInfo
159 updVectInfo env tyenv info
161 vectInfoVar = global_exported_vars env
162 , vectInfoTyCon = tc_env
165 tc_env = mkNameEnv [(tc_name, (tc,tc'))
166 | tc <- typeEnvTyCons tyenv
167 , let tc_name = tyConName tc
168 , Just tc' <- [lookupNameEnv (global_tycons env) tc_name]]
170 data VResult a = Yes GlobalEnv LocalEnv a | No
172 newtype VM a = VM { runVM :: Builtins -> GlobalEnv -> LocalEnv -> DsM (VResult a) }
174 instance Monad VM where
175 return x = VM $ \bi genv lenv -> return (Yes genv lenv x)
176 VM p >>= f = VM $ \bi genv lenv -> do
179 Yes genv' lenv' x -> runVM (f x) bi genv' lenv'
183 noV = VM $ \_ _ _ -> return No
185 tryV :: VM a -> VM (Maybe a)
186 tryV (VM p) = VM $ \bi genv lenv ->
190 Yes genv' lenv' x -> return (Yes genv' lenv' (Just x))
191 No -> return (Yes genv lenv Nothing)
193 maybeV :: VM (Maybe a) -> VM a
194 maybeV p = maybe noV return =<< p
196 orElseV :: VM a -> VM a -> VM a
197 orElseV p q = maybe q return =<< tryV p
199 localV :: VM a -> VM a
206 closedV :: VM a -> VM a
209 setLEnv emptyLocalEnv
214 liftDs :: DsM a -> VM a
215 liftDs p = VM $ \bi genv lenv -> do { x <- p; return (Yes genv lenv x) }
217 builtin :: (Builtins -> a) -> VM a
218 builtin f = VM $ \bi genv lenv -> return (Yes genv lenv (f bi))
220 readGEnv :: (GlobalEnv -> a) -> VM a
221 readGEnv f = VM $ \bi genv lenv -> return (Yes genv lenv (f genv))
223 setGEnv :: GlobalEnv -> VM ()
224 setGEnv genv = VM $ \_ _ lenv -> return (Yes genv lenv ())
226 updGEnv :: (GlobalEnv -> GlobalEnv) -> VM ()
227 updGEnv f = VM $ \_ genv lenv -> return (Yes (f genv) lenv ())
229 readLEnv :: (LocalEnv -> a) -> VM a
230 readLEnv f = VM $ \bi genv lenv -> return (Yes genv lenv (f lenv))
232 setLEnv :: LocalEnv -> VM ()
233 setLEnv lenv = VM $ \_ genv _ -> return (Yes genv lenv ())
235 updLEnv :: (LocalEnv -> LocalEnv) -> VM ()
236 updLEnv f = VM $ \_ genv lenv -> return (Yes genv (f lenv) ())
238 getInstEnv :: VM (InstEnv, InstEnv)
239 getInstEnv = readGEnv global_inst_env
241 getFamInstEnv :: VM FamInstEnvs
242 getFamInstEnv = readGEnv global_fam_inst_env
244 cloneName :: (OccName -> OccName) -> Name -> VM Name
245 cloneName mk_occ name = liftM make (liftDs newUnique)
247 occ_name = mk_occ (nameOccName name)
249 make u | isExternalName name = mkExternalName u (nameModule name)
252 | otherwise = mkSystemName u occ_name
254 newLocalVar :: FastString -> Type -> VM Var
257 u <- liftDs newUnique
258 return $ mkSysLocal fs u ty
260 newTyVar :: FastString -> Kind -> VM Var
263 u <- liftDs newUnique
264 return $ mkTyVar (mkSysTvName u fs) k
266 defGlobalVar :: Var -> Var -> VM ()
267 defGlobalVar v v' = updGEnv $ \env ->
268 env { global_vars = extendVarEnv (global_vars env) v (Var v')
269 , global_exported_vars = upd (global_exported_vars env)
272 upd env | isExportedId v = extendVarEnv env v (v, v')
275 lookupVar :: Var -> VM (Scope CoreExpr (CoreExpr, CoreExpr))
278 r <- readLEnv $ \env -> lookupVarEnv (local_vars env) v
280 Just e -> return (Local e)
281 Nothing -> liftM Global
282 $ maybeV (readGEnv $ \env -> lookupVarEnv (global_vars env) v)
284 lookupTyCon :: TyCon -> VM (Maybe TyCon)
285 lookupTyCon tc = readGEnv $ \env -> lookupNameEnv (global_tycons env) (tyConName tc)
287 lookupTyVarPA :: Var -> VM (Maybe CoreExpr)
288 lookupTyVarPA tv = readLEnv $ \env -> lookupVarEnv (local_tyvar_pa env) tv
290 extendTyVarPA :: Var -> CoreExpr -> VM ()
291 extendTyVarPA tv pa = updLEnv $ \env -> env { local_tyvar_pa = extendVarEnv (local_tyvar_pa env) tv pa }
293 deleteTyVarPA :: Var -> VM ()
294 deleteTyVarPA tv = updLEnv $ \env -> env { local_tyvar_pa = delVarEnv (local_tyvar_pa env) tv }
296 -- Look up the dfun of a class instance.
298 -- The match must be unique - ie, match exactly one instance - but the
299 -- type arguments used for matching may be more specific than those of
300 -- the class instance declaration. The found class instances must not have
301 -- any type variables in the instance context that do not appear in the
302 -- instances head (i.e., no flexi vars); for details for what this means,
303 -- see the docs at InstEnv.lookupInstEnv.
305 lookupInst :: Class -> [Type] -> VM (DFunId, [Type])
307 = do { instEnv <- getInstEnv
308 ; case lookupInstEnv instEnv cls tys of
309 ([(inst, inst_tys)], _)
310 | noFlexiVar -> return (instanceDFunId inst, inst_tys')
311 | otherwise -> pprPanic "VectMonad.lookupInst: flexi var: "
312 (ppr $ mkTyConApp (classTyCon cls) tys)
314 inst_tys' = [ty | Right ty <- inst_tys]
315 noFlexiVar = all isRight inst_tys
319 isRight (Left _) = False
320 isRight (Right _) = True
322 -- Look up the representation tycon of a family instance.
324 -- The match must be unique - ie, match exactly one instance - but the
325 -- type arguments used for matching may be more specific than those of
326 -- the family instance declaration.
328 -- Return the instance tycon and its type instance. For example, if we have
330 -- lookupFamInst 'T' '[Int]' yields (':R42T', 'Int')
332 -- then we have a coercion (ie, type instance of family instance coercion)
334 -- :Co:R42T Int :: T [Int] ~ :R42T Int
336 -- which implies that :R42T was declared as 'data instance T [a]'.
338 lookupFamInst :: TyCon -> [Type] -> VM (TyCon, [Type])
339 lookupFamInst tycon tys
340 = ASSERT( isOpenTyCon tycon )
341 do { instEnv <- getFamInstEnv
342 ; case lookupFamInstEnv instEnv tycon tys of
343 [(fam_inst, rep_tys)] -> return (famInstTyCon fam_inst, rep_tys)
345 pprPanic "VectMonad.lookupFamInst: not found: "
346 (ppr $ mkTyConApp tycon tys)
349 initV :: HscEnv -> ModGuts -> VectInfo -> VM a -> IO (Maybe (VectInfo, a))
350 initV hsc_env guts info p
352 eps <- hscEPS hsc_env
353 let famInstEnvs = (eps_fam_inst_env eps, mg_fam_inst_env guts)
354 let instEnvs = (eps_inst_env eps, mg_inst_env guts)
356 Just r <- initDs hsc_env (mg_module guts)
359 (go instEnvs famInstEnvs)
363 go instEnvs famInstEnvs =
365 builtins <- initBuiltins
366 r <- runVM p builtins (initGlobalEnv info instEnvs famInstEnvs)
369 Yes genv _ x -> return $ Just (new_info genv, x)
372 new_info genv = updVectInfo genv (mg_types guts) info