X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=compiler%2Fmain%2FInteractiveEval.hs;h=42b787a6b3387a974b835c038591268e0885cc0a;hb=b0d80aa3d908a6b9991920a5ac7fd1b437ecafd3;hp=b830db624841af427013b416dbd25e2b4995cacc;hpb=17f848e12faf8cf51aa58918522b6abe1e75dc51;p=ghc-hetmet.git diff --git a/compiler/main/InteractiveEval.hs b/compiler/main/InteractiveEval.hs index b830db6..42b787a 100644 --- a/compiler/main/InteractiveEval.hs +++ b/compiler/main/InteractiveEval.hs @@ -28,7 +28,8 @@ module InteractiveEval ( isModuleInterpreted, compileExpr, dynCompileExpr, lookupName, - obtainTerm, obtainTerm1 + obtainTerm, obtainTerm1, reconstructType, + skolemiseSubst, skolemiseTy #endif ) where @@ -72,7 +73,6 @@ import Control.Monad import Foreign import Foreign.C import GHC.Exts -import GHC.Conc ( ThreadId(..) ) import Data.Array import Control.Exception as Exception import Control.Concurrent @@ -164,7 +164,7 @@ runStmt (Session ref) expr step let thing_to_run = unsafeCoerce# hval :: IO [HValue] status <- sandboxIO statusMVar thing_to_run - + let ic = hsc_IC hsc_env bindings = (ic_tmp_ids ic, ic_tyvars ic) @@ -206,8 +206,9 @@ handleRunStatus expr ref bindings final_ids breakMVar statusMVar status final_ids emptyVarSet -- the bound Ids never have any free TyVars final_names = map idName final_ids - writeIORef ref hsc_env{hsc_IC=final_ic} Linker.extendLinkEnv (zip final_names hvals) + hsc_env' <- rttiEnvironment hsc_env{hsc_IC=final_ic} + writeIORef ref hsc_env' return (RunOk final_names) @@ -269,10 +270,26 @@ foreign import ccall "&rts_breakpoint_io_action" sandboxIO :: MVar Status -> IO [HValue] -> IO Status sandboxIO statusMVar thing = withInterruptsSentTo - (forkIO (do res <- Exception.try thing + (forkIO (do res <- Exception.try (rethrow thing) putMVar statusMVar (Complete res))) (takeMVar statusMVar) +-- We want to turn ^C into a break when -fbreak-on-exception is on, +-- but it's an async exception and we only break for sync exceptions. +-- Idea: if we catch and re-throw it, then the re-throw will trigger +-- a break. Great - but we don't want to re-throw all exceptions, because +-- then we'll get a double break for ordinary sync exceptions (you'd have +-- to :continue twice, which looks strange). So if the exception is +-- not "Interrupted", we unset the exception flag before throwing. +-- +rethrow :: IO a -> IO a +rethrow io = Exception.catch io $ \e -> -- NB. not catchDyn + case e of + DynException d | Just Interrupted <- fromDynamic d + -> Exception.throwIO e + _ -> do poke exceptionFlag 0; Exception.throwIO e + + withInterruptsSentTo :: IO ThreadId -> IO r -> IO r withInterruptsSentTo io get_result = do ts <- takeMVar interruptTargetThread @@ -405,7 +422,8 @@ moveHist fn (Session ref) = do -- ----------------------------------------------------------------------------- -- After stopping at a breakpoint, add free variables to the environment - +result_fs = FSLIT("_result") + bindLocalsAtBreakpoint :: HscEnv -> HValue @@ -460,7 +478,8 @@ bindLocalsAtBreakpoint hsc_env apStack (Just info) = do -- So that we don't fall over in a heap when this happens, just don't -- bind any free variables instead, and we emit a warning. mb_hValues <- mapM (getIdValFromApStack apStack) offsets - let filtered_ids = [ id | (id, Just _) <- zip ids mb_hValues ] + let (filtered_hvs, filtered_ids) = + unzip [ (hv, id) | (id, Just hv) <- zip ids mb_hValues ] when (any isNothing mb_hValues) $ debugTraceMsg (hsc_dflags hsc_env) 1 $ text "Warning: _result has been evaluated, some bindings have been lost" @@ -471,8 +490,7 @@ bindLocalsAtBreakpoint hsc_env apStack (Just info) = do -- make an Id for _result. We use the Unique of the FastString "_result"; -- we don't care about uniqueness here, because there will only be one -- _result in scope at any time. - let result_fs = FSLIT("_result") - result_name = mkInternalName (getUnique result_fs) + let result_name = mkInternalName (getUnique result_fs) (mkVarOccFS result_fs) span result_id = Id.mkGlobalId VanillaGlobal result_name result_ty vanillaIdInfo @@ -489,14 +507,13 @@ bindLocalsAtBreakpoint hsc_env apStack (Just info) = do (id_tys, tyvarss) = mapAndUnzip (skolemiseTy.idType) all_ids (_,tidy_tys) = tidyOpenTypes emptyTidyEnv id_tys new_tyvars = unionVarSets tyvarss - final_ids = zipWith setIdType all_ids tidy_tys - - let ictxt0 = hsc_IC hsc_env - ictxt1 = extendInteractiveContext ictxt0 final_ids new_tyvars - + let final_ids = zipWith setIdType all_ids tidy_tys + ictxt0 = hsc_IC hsc_env + ictxt1 = extendInteractiveContext ictxt0 final_ids new_tyvars Linker.extendLinkEnv [ (name,hval) | (name, Just hval) <- zip names mb_hValues ] Linker.extendLinkEnv [(result_name, unsafeCoerce# apStack)] - return (hsc_env{ hsc_IC = ictxt1 }, result_name:names, span) + hsc_env1 <- rttiEnvironment hsc_env{ hsc_IC = ictxt1 } + return (hsc_env1, result_name:names, span) where mkNewId :: OccName -> Id -> IO Id mkNewId occ id = do @@ -507,6 +524,26 @@ bindLocalsAtBreakpoint hsc_env apStack (Just info) = do new_id = Id.mkGlobalId VanillaGlobal name ty (idInfo id) return new_id +rttiEnvironment :: HscEnv -> IO HscEnv +rttiEnvironment hsc_env@HscEnv{hsc_IC=ic} = do + let InteractiveContext{ic_tmp_ids=tmp_ids, ic_tyvars = tyvars} = ic + incompletelyTypedIds = + [id | id <- tmp_ids + , not $ null [v | v <- varSetElems$ tyVarsOfType (idType id) + , isSkolemTyVar v] + , (occNameFS.nameOccName.idName) id /= result_fs] + tys <- reconstructType hsc_env False `mapM` incompletelyTypedIds + -- map termType `fmap` (obtainTerm hsc_env False `mapM` incompletelyTypedIds) + + let substs = [computeRTTIsubst ty ty' + | (ty, Just ty') <- zip (map idType incompletelyTypedIds) tys] + ic' = foldr (flip substInteractiveContext) ic + (map skolemiseSubst $ catMaybes substs) + return hsc_env{hsc_IC=ic'} + +skolemiseSubst subst = subst `setTvSubstEnv` + mapVarEnv (fst.skolemiseTy) (getTvSubstEnv subst) + skolemiseTy :: Type -> (Type, TyVarSet) skolemiseTy ty = (substTy subst ty, mkVarSet new_tyvars) where env = mkVarEnv (zip tyvars new_tyvar_tys) @@ -632,7 +669,7 @@ mkExportEnv hsc_env mods = do nameSetToGlobalRdrEnv :: NameSet -> ModuleName -> GlobalRdrEnv nameSetToGlobalRdrEnv names mod = - mkGlobalRdrEnv [ GRE { gre_name = name, gre_prov = vanillaProv mod } + mkGlobalRdrEnv [ GRE { gre_name = name, gre_par = NoParent, gre_prov = vanillaProv mod } | name <- nameSetToList names ] vanillaProv :: ModuleName -> Provenance @@ -674,8 +711,29 @@ moduleIsInterpreted s modl = withSession s $ \h -> _not_a_home_module -> return False -- | Looks up an identifier in the current interactive context (for :info) +-- Filter the instances by the ones whose tycons (or clases resp) +-- are in scope (qualified or otherwise). Otherwise we list a whole lot too many! +-- The exact choice of which ones to show, and which to hide, is a judgement call. +-- (see Trac #1581) getInfo :: Session -> Name -> IO (Maybe (TyThing,Fixity,[Instance])) -getInfo s name = withSession s $ \hsc_env -> tcRnGetInfo hsc_env name +getInfo s name + = withSession s $ \hsc_env -> + do { mb_stuff <- tcRnGetInfo hsc_env name + ; case mb_stuff of + Nothing -> return Nothing + Just (thing, fixity, ispecs) -> do + { let rdr_env = ic_rn_gbl_env (hsc_IC hsc_env) + ; return (Just (thing, fixity, filter (plausible rdr_env) ispecs)) } } + where + plausible rdr_env ispec -- Dfun involving only names that are in ic_rn_glb_env + = all ok $ nameSetToList $ tyClsNamesOfType $ idType $ instanceDFunId ispec + where -- A name is ok if it's in the rdr_env, + -- whether qualified or not + ok n | n == name = True -- The one we looked for in the first place! + | isBuiltInSyntax n = True + | isExternalName n = any ((== n) . gre_name) + (lookupGRE_Name rdr_env n) + | otherwise = True -- | Returns all names in scope in the current interactive context getNamesInScope :: Session -> IO [Name] @@ -804,12 +862,21 @@ isModuleInterpreted s mod_summary = withSession s $ \hsc_env -> where obj_linkable = isObjectLinkable (expectJust "showModule" (hm_linkable mod_info)) -obtainTerm1 :: Session -> Bool -> Maybe Type -> a -> IO Term -obtainTerm1 sess force mb_ty x = withSession sess $ \hsc_env -> cvObtainTerm hsc_env force mb_ty (unsafeCoerce# x) +---------------------------------------------------------------------------- +-- RTTI primitives + +obtainTerm1 :: HscEnv -> Bool -> Maybe Type -> a -> IO Term +obtainTerm1 hsc_env force mb_ty x = + cvObtainTerm hsc_env force mb_ty (unsafeCoerce# x) -obtainTerm :: Session -> Bool -> Id -> IO Term -obtainTerm sess force id = withSession sess $ \hsc_env -> do +obtainTerm :: HscEnv -> Bool -> Id -> IO Term +obtainTerm hsc_env force id = do hv <- Linker.getHValue hsc_env (varName id) cvObtainTerm hsc_env force (Just$ idType id) hv +-- Uses RTTI to reconstruct the type of an Id, making it less polymorphic +reconstructType :: HscEnv -> Bool -> Id -> IO (Maybe Type) +reconstructType hsc_env force id = do + hv <- Linker.getHValue hsc_env (varName id) + cvReconstructType hsc_env force (Just$ idType id) hv #endif /* GHCI */