{-# LANGUAGE LambdaCase #-} module GHC.Driver.Env ( Hsc(..) , HscEnv (..) , hscUpdateFlags , hscSetFlags , hsc_home_unit , hsc_home_unit_maybe , hsc_units , hsc_HPT , hsc_HUE , hsc_HUG , hsc_all_home_unit_ids , hscUpdateLoggerFlags , hscUpdateHUG , hscUpdateHPT , hscSetActiveHomeUnit , hscSetActiveUnitId , hscActiveUnitId , runHsc , runHsc' , mkInteractiveHscEnv , runInteractiveHsc , hscEPS , hscInterp , hptCompleteSigs , hptAllInstances , hptInstancesBelow , hptAnns , hptAllThings , hptSomeThingsBelowUs , hptRules , prepareAnnotations , discardIC , lookupType , lookupIfaceByModule , mainModIs ) where import GHC.Prelude import GHC.Driver.Session import GHC.Driver.Errors ( printOrThrowDiagnostics ) import GHC.Driver.Errors.Types ( GhcMessage ) import GHC.Driver.Config.Logger (initLogFlags) import GHC.Driver.Config.Diagnostic (initDiagOpts) import GHC.Driver.Env.Types ( Hsc(..), HscEnv(..) ) import GHC.Runtime.Context import GHC.Runtime.Interpreter.Types (Interp) import GHC.Unit import GHC.Unit.Module.ModGuts import GHC.Unit.Module.ModIface import GHC.Unit.Module.ModDetails import GHC.Unit.Home.ModInfo import GHC.Unit.Env import GHC.Unit.External import GHC.Core ( CoreRule ) import GHC.Core.FamInstEnv import GHC.Core.InstEnv import GHC.Types.Annotations ( Annotation, AnnEnv, mkAnnEnv, plusAnnEnv ) import GHC.Types.CompleteMatch import GHC.Types.Error ( emptyMessages, Messages ) import GHC.Types.Name import GHC.Types.Name.Env import GHC.Types.TyThing import GHC.Builtin.Names ( gHC_PRIM ) import GHC.Data.Maybe import GHC.Utils.Exception as Ex import GHC.Utils.Outputable import GHC.Utils.Monad import GHC.Utils.Panic import GHC.Utils.Misc import GHC.Utils.Logger import GHC.Utils.Trace import Data.IORef import qualified Data.Set as Set import Data.Set (Set) import GHC.Unit.Module.Graph import Data.List (sort) import qualified Data.Map as Map runHsc :: HscEnv -> Hsc a -> IO a runHsc hsc_env (Hsc hsc) = do (a, w) <- hsc hsc_env emptyMessages let dflags = hsc_dflags hsc_env let !diag_opts = initDiagOpts dflags printOrThrowDiagnostics (hsc_logger hsc_env) diag_opts w return a runHsc' :: HscEnv -> Hsc a -> IO (a, Messages GhcMessage) runHsc' hsc_env (Hsc hsc) = hsc hsc_env emptyMessages -- | Switches in the DynFlags and Plugins from the InteractiveContext mkInteractiveHscEnv :: HscEnv -> HscEnv mkInteractiveHscEnv hsc_env = let ic = hsc_IC hsc_env in hscSetFlags (ic_dflags ic) $ hsc_env { hsc_plugins = ic_plugins ic } -- | A variant of runHsc that switches in the DynFlags and Plugins from the -- InteractiveContext before running the Hsc computation. runInteractiveHsc :: HscEnv -> Hsc a -> IO a runInteractiveHsc hsc_env = runHsc (mkInteractiveHscEnv hsc_env) hsc_home_unit :: HscEnv -> HomeUnit hsc_home_unit = unsafeGetHomeUnit . hsc_unit_env hsc_home_unit_maybe :: HscEnv -> Maybe HomeUnit hsc_home_unit_maybe = ue_homeUnit . hsc_unit_env hsc_units :: HasDebugCallStack => HscEnv -> UnitState hsc_units = ue_units . hsc_unit_env hsc_HPT :: HscEnv -> HomePackageTable hsc_HPT = ue_hpt . hsc_unit_env hsc_HUE :: HscEnv -> HomeUnitEnv hsc_HUE = ue_currentHomeUnitEnv . hsc_unit_env hsc_HUG :: HscEnv -> HomeUnitGraph hsc_HUG = ue_home_unit_graph . hsc_unit_env hsc_all_home_unit_ids :: HscEnv -> Set.Set UnitId hsc_all_home_unit_ids = unitEnv_keys . hsc_HUG hscUpdateHPT :: (HomePackageTable -> HomePackageTable) -> HscEnv -> HscEnv hscUpdateHPT f hsc_env = hsc_env { hsc_unit_env = updateHpt f (hsc_unit_env hsc_env) } hscUpdateHUG :: (HomeUnitGraph -> HomeUnitGraph) -> HscEnv -> HscEnv hscUpdateHUG f hsc_env = hsc_env { hsc_unit_env = updateHug f (hsc_unit_env hsc_env) } {- Note [Target code interpreter] ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Template Haskell and GHCi use an interpreter to execute code that is built for the compiler target platform (= code host platform) on the compiler host platform (= code build platform). The internal interpreter can be used when both platforms are the same and when the built code is compatible with the compiler itself (same way, etc.). This interpreter is not always available: for instance stage1 compiler doesn't have it because there might be an ABI mismatch between the code objects (built by stage1 compiler) and the stage1 compiler itself (built by stage0 compiler). In most cases, an external interpreter can be used instead: it runs in a separate process and it communicates with the compiler via a two-way message passing channel. The process is lazily spawned to avoid overhead when it is not used. The target code interpreter to use can be selected per session via the `hsc_interp` field of `HscEnv`. There may be no interpreter available at all, in which case Template Haskell and GHCi will fail to run. The interpreter to use is configured via command-line flags (in `GHC.setSessionDynFlags`). -} -- Note [hsc_type_env_var hack] -- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~ -- hsc_type_env_var is used to initialize tcg_type_env_var, and -- eventually it is the mutable variable that is queried from -- if_rec_types to get a TypeEnv. So, clearly, it's something -- related to knot-tying (see Note [Tying the knot]). -- hsc_type_env_var is used in two places: initTcRn (where -- it initializes tcg_type_env_var) and initIfaceCheck -- (where it initializes if_rec_types). -- -- But why do we need a way to feed a mutable variable in? Why -- can't we just initialize tcg_type_env_var when we start -- typechecking? The problem is we need to knot-tie the -- EPS, and we may start adding things to the EPS before type -- checking starts. -- -- Here is a concrete example. Suppose we are running -- "ghc -c A.hs", and we have this file system state: -- -- A.hs-boot A.hi-boot **up to date** -- B.hs B.hi **up to date** -- A.hs A.hi **stale** -- -- The first thing we do is run checkOldIface on A.hi. -- checkOldIface will call loadInterface on B.hi so it can -- get its hands on the fingerprints, to find out if A.hi -- needs recompilation. But loadInterface also populates -- the EPS! And so if compilation turns out to be necessary, -- as it is in this case, the thunks we put into the EPS for -- B.hi need to have the correct if_rec_types mutable variable -- to query. -- -- If the mutable variable is only allocated WHEN we start -- typechecking, then that's too late: we can't get the -- information to the thunks. So we need to pre-commit -- to a type variable in 'hscIncrementalCompile' BEFORE we -- check the old interface. -- -- This is all a massive hack because arguably checkOldIface -- should not populate the EPS. But that's a refactor for -- another day. -- | Retrieve the ExternalPackageState cache. hscEPS :: HscEnv -> IO ExternalPackageState hscEPS hsc_env = readIORef (euc_eps (ue_eps (hsc_unit_env hsc_env))) hptCompleteSigs :: HscEnv -> [CompleteMatch] hptCompleteSigs = hptAllThings (md_complete_matches . hm_details) -- | Find all the instance declarations (of classes and families) from -- the Home Package Table filtered by the provided predicate function. -- Used in @tcRnImports@, to select the instances that are in the -- transitive closure of imports from the currently compiled module. hptAllInstances :: HscEnv -> (InstEnv, [FamInst]) hptAllInstances hsc_env = let (insts, famInsts) = unzip $ flip hptAllThings hsc_env $ \mod_info -> do let details = hm_details mod_info return (md_insts details, md_fam_insts details) in (foldl' unionInstEnv emptyInstEnv insts, concat famInsts) -- | Find instances visible from the given set of imports hptInstancesBelow :: HscEnv -> UnitId -> ModuleNameWithIsBoot -> (InstEnv, [FamInst]) hptInstancesBelow hsc_env uid mnwib = let mn = gwib_mod mnwib (insts, famInsts) = unzip $ hptSomeThingsBelowUs (\mod_info -> let details = hm_details mod_info -- Don't include instances for the current module in if moduleName (mi_module (hm_iface mod_info)) == mn then [] else [(md_insts details, md_fam_insts details)]) True -- Include -hi-boot hsc_env uid mnwib in (foldl' unionInstEnv emptyInstEnv insts, concat famInsts) -- | Get rules from modules "below" this one (in the dependency sense) hptRules :: HscEnv -> UnitId -> ModuleNameWithIsBoot -> [CoreRule] hptRules = hptSomeThingsBelowUs (md_rules . hm_details) False -- | Get annotations from modules "below" this one (in the dependency sense) hptAnns :: HscEnv -> Maybe (UnitId, ModuleNameWithIsBoot) -> [Annotation] hptAnns hsc_env (Just (uid, mn)) = hptSomeThingsBelowUs (md_anns . hm_details) False hsc_env uid mn hptAnns hsc_env Nothing = hptAllThings (md_anns . hm_details) hsc_env hptAllThings :: (HomeModInfo -> [a]) -> HscEnv -> [a] hptAllThings extract hsc_env = concatMap (concatMap extract . eltsHpt . homeUnitEnv_hpt . snd) (hugElts (hsc_HUG hsc_env)) -- | This function returns all the modules belonging to the home-unit that can -- be reached by following the given dependencies. Additionally, if both the -- boot module and the non-boot module can be reached, it only returns the -- non-boot one. hptModulesBelow :: HscEnv -> UnitId -> ModuleNameWithIsBoot -> Set ModNodeKeyWithUid hptModulesBelow hsc_env uid mn = filtered_mods $ [ mn | NodeKey_Module mn <- modules_below] where td_map = mgTransDeps (hsc_mod_graph hsc_env) modules_below = maybe [] Set.toList $ Map.lookup (NodeKey_Module (ModNodeKeyWithUid mn uid)) td_map filtered_mods = Set.fromDistinctAscList . filter_mods . sort -- IsBoot and NotBoot modules are necessarily consecutive in the sorted list -- (cf Ord instance of GenWithIsBoot). Hence we only have to perform a -- linear sweep with a window of size 2 to remove boot modules for which we -- have the corresponding non-boot. filter_mods = \case (r1@(ModNodeKeyWithUid (GWIB m1 b1) uid1) : r2@(ModNodeKeyWithUid (GWIB m2 _) uid2): rs) | m1 == m2 && uid1 == uid2 -> let !r' = case b1 of NotBoot -> r1 IsBoot -> r2 in r' : filter_mods rs | otherwise -> r1 : filter_mods (r2:rs) rs -> rs -- | Get things from modules "below" this one (in the dependency sense) -- C.f Inst.hptInstances hptSomeThingsBelowUs :: (HomeModInfo -> [a]) -> Bool -> HscEnv -> UnitId -> ModuleNameWithIsBoot -> [a] hptSomeThingsBelowUs extract include_hi_boot hsc_env uid mn | isOneShot (ghcMode (hsc_dflags hsc_env)) = [] | otherwise = let hug = hsc_HUG hsc_env in [ thing | -- Find each non-hi-boot module below me (ModNodeKeyWithUid (GWIB { gwib_mod = mod, gwib_isBoot = is_boot }) mod_uid) <- Set.toList (hptModulesBelow hsc_env uid mn) , include_hi_boot || (is_boot == NotBoot) -- unsavoury: when compiling the base package with --make, we -- sometimes try to look up RULES etc for GHC.Prim. GHC.Prim won't -- be in the HPT, because we never compile it; it's in the EPT -- instead. ToDo: clean up, and remove this slightly bogus filter: , mod /= moduleName gHC_PRIM , not (mod == gwib_mod mn && uid == mod_uid) -- Look it up in the HPT , let things = case lookupHug hug mod_uid mod of Just info -> extract info Nothing -> pprTrace "WARNING in hptSomeThingsBelowUs" msg mempty msg = vcat [text "missing module" <+> ppr mod, text "When starting from" <+> ppr mn, text "below:" <+> ppr (hptModulesBelow hsc_env uid mn), text "Probable cause: out-of-date interface files"] -- This really shouldn't happen, but see #962 , thing <- things ] -- | Deal with gathering annotations in from all possible places -- and combining them into a single 'AnnEnv' prepareAnnotations :: HscEnv -> Maybe ModGuts -> IO AnnEnv prepareAnnotations hsc_env mb_guts = do eps <- hscEPS hsc_env let -- Extract annotations from the module being compiled if supplied one mb_this_module_anns = fmap (mkAnnEnv . mg_anns) mb_guts -- Extract dependencies of the module if we are supplied one, -- otherwise load annotations from all home package table -- entries regardless of dependency ordering. get_mod mg = (moduleUnitId (mg_module mg), GWIB (moduleName (mg_module mg)) NotBoot) home_pkg_anns = (mkAnnEnv . hptAnns hsc_env) $ fmap get_mod mb_guts other_pkg_anns = eps_ann_env eps ann_env = foldl1' plusAnnEnv $ catMaybes [mb_this_module_anns, Just home_pkg_anns, Just other_pkg_anns] return ann_env -- | Find the 'TyThing' for the given 'Name' by using all the resources -- at our disposal: the compiled modules in the 'HomePackageTable' and the -- compiled modules in other packages that live in 'PackageTypeEnv'. Note -- that this does NOT look up the 'TyThing' in the module being compiled: you -- have to do that yourself, if desired lookupType :: HscEnv -> Name -> IO (Maybe TyThing) lookupType hsc_env name = do eps <- liftIO $ hscEPS hsc_env let pte = eps_PTE eps hpt = hsc_HUG hsc_env mod = assertPpr (isExternalName name) (ppr name) $ if isHoleName name then mkHomeModule (hsc_home_unit hsc_env) (moduleName (nameModule name)) else nameModule name !ty = if isOneShot (ghcMode (hsc_dflags hsc_env)) -- in one-shot, we don't use the HPT then lookupNameEnv pte name else case lookupHugByModule mod hpt of Just hm -> lookupNameEnv (md_types (hm_details hm)) name Nothing -> lookupNameEnv pte name pure ty -- | Find the 'ModIface' for a 'Module', searching in both the loaded home -- and external package module information lookupIfaceByModule :: HomeUnitGraph -> PackageIfaceTable -> Module -> Maybe ModIface lookupIfaceByModule hug pit mod = case lookupHugByModule mod hug of Just hm -> Just (hm_iface hm) Nothing -> lookupModuleEnv pit mod -- If the module does come from the home package, why do we look in the PIT as well? -- (a) In OneShot mode, even home-package modules accumulate in the PIT -- (b) Even in Batch (--make) mode, there is *one* case where a home-package -- module is in the PIT, namely GHC.Prim when compiling the base package. -- We could eliminate (b) if we wanted, by making GHC.Prim belong to a package -- of its own, but it doesn't seem worth the bother. mainModIs :: HomeUnitEnv -> Module mainModIs hue = mkHomeModule (expectJust "mainModIs" $ homeUnitEnv_home_unit hue) (mainModuleNameIs (homeUnitEnv_dflags hue)) -- | Retrieve the target code interpreter -- -- Fails if no target code interpreter is available hscInterp :: HscEnv -> Interp hscInterp hsc_env = case hsc_interp hsc_env of Nothing -> throw (InstallationError "Couldn't find a target code interpreter. Try with -fexternal-interpreter") Just i -> i -- | Update the LogFlags of the Log in hsc_logger from the DynFlags in -- hsc_dflags. You need to call this when DynFlags are modified. hscUpdateLoggerFlags :: HscEnv -> HscEnv hscUpdateLoggerFlags h = h { hsc_logger = setLogFlags (hsc_logger h) (initLogFlags (hsc_dflags h)) } -- | Update Flags hscUpdateFlags :: (DynFlags -> DynFlags) -> HscEnv -> HscEnv hscUpdateFlags f h = hscSetFlags (f (hsc_dflags h)) h -- | Set Flags hscSetFlags :: HasDebugCallStack => DynFlags -> HscEnv -> HscEnv hscSetFlags dflags h = hscUpdateLoggerFlags $ h { hsc_dflags = dflags , hsc_unit_env = ue_setFlags dflags (hsc_unit_env h) } -- See Note [Multiple Home Units] hscSetActiveHomeUnit :: HasDebugCallStack => HomeUnit -> HscEnv -> HscEnv hscSetActiveHomeUnit home_unit = hscSetActiveUnitId (homeUnitId home_unit) hscSetActiveUnitId :: HasDebugCallStack => UnitId -> HscEnv -> HscEnv hscSetActiveUnitId uid e = e { hsc_unit_env = ue_setActiveUnit uid (hsc_unit_env e) , hsc_dflags = ue_unitFlags uid (hsc_unit_env e) } hscActiveUnitId :: HscEnv -> UnitId hscActiveUnitId e = ue_currentUnit (hsc_unit_env e) -- | Discard the contents of the InteractiveContext, but keep the DynFlags and -- the loaded plugins. It will also keep ic_int_print and ic_monad if their -- names are from external packages. discardIC :: HscEnv -> HscEnv discardIC hsc_env = hsc_env { hsc_IC = empty_ic { ic_int_print = new_ic_int_print , ic_monad = new_ic_monad , ic_plugins = old_plugins } } where -- Force the new values for ic_int_print and ic_monad to avoid leaking old_ic !new_ic_int_print = keep_external_name ic_int_print !new_ic_monad = keep_external_name ic_monad !old_plugins = ic_plugins old_ic dflags = ic_dflags old_ic old_ic = hsc_IC hsc_env empty_ic = emptyInteractiveContext dflags keep_external_name ic_name | nameIsFromExternalPackage home_unit old_name = old_name | otherwise = ic_name empty_ic where home_unit = hsc_home_unit hsc_env old_name = ic_name old_ic