{-# LANGUAGE CPP, TupleSections, RecordWildCards #-} {-# LANGUAGE BangPatterns #-} -- -- (c) The University of Glasgow 2002-2006 -- | The loader -- -- This module deals with the top-level issues of dynamic linking (loading), -- calling the object-code linker and the byte-code linker where necessary. module GHC.Linker.Loader ( Loader (..) , LoaderState (..) , initLoaderState , uninitializedLoader , showLoaderState -- * Load & Unload , loadExpr , loadDecls , loadPackages , loadModule , loadCmdLineLibs , loadName , unload -- * LoadedEnv , withExtendedLoadedEnv , extendLoadedEnv , deleteFromLoadedEnv -- * Misc , extendLoadedPkgs ) where #include "HsVersions.h" import GHC.Prelude import GHC.Settings import GHC.Platform import GHC.Platform.Ways import GHC.Driver.Phases import GHC.Driver.Env import GHC.Driver.Session import GHC.Driver.Ppr import GHC.Tc.Utils.Monad import GHC.Runtime.Interpreter import GHC.Runtime.Interpreter.Types import GHCi.RemoteTypes import GHC.Iface.Load import GHC.ByteCode.Linker import GHC.ByteCode.Asm import GHC.ByteCode.Types import GHC.SysTools import GHC.SysTools.FileCleanup import GHC.Types.Basic import GHC.Types.Name import GHC.Types.Name.Env import GHC.Types.SrcLoc import GHC.Types.Unique.DSet import GHC.Utils.Outputable import GHC.Utils.Panic import GHC.Utils.Misc import GHC.Utils.Error import GHC.Utils.Logger import GHC.Unit.Env import GHC.Unit.Finder import GHC.Unit.Module import GHC.Unit.Module.ModIface import GHC.Unit.Module.Deps import GHC.Unit.Home import GHC.Unit.Home.ModInfo import GHC.Unit.State as Packages import qualified GHC.Data.ShortText as ST import qualified GHC.Data.Maybe as Maybes import GHC.Data.FastString import GHC.Data.List.SetOps import GHC.Linker.MacOS import GHC.Linker.Dynamic import GHC.Linker.Types -- Standard libraries import Control.Monad import qualified Data.Set as Set import Data.Char (isSpace) import Data.Function ((&)) import Data.IORef import Data.List (intercalate, isPrefixOf, isSuffixOf, nub, partition) import Data.Maybe import Control.Concurrent.MVar import qualified Control.Monad.Catch as MC import System.FilePath import System.Directory import System.IO.Unsafe import System.Environment (lookupEnv) #if defined(mingw32_HOST_OS) import System.Win32.Info (getSystemDirectory) #endif import GHC.Utils.Exception uninitialised :: a uninitialised = panic "Loader not initialised" modifyLS_ :: Loader -> (LoaderState -> IO LoaderState) -> IO () modifyLS_ dl f = modifyMVar_ (loader_state dl) (fmap pure . f . fromMaybe uninitialised) modifyLS :: Loader -> (LoaderState -> IO (LoaderState, a)) -> IO a modifyLS dl f = modifyMVar (loader_state dl) (fmapFst pure . f . fromMaybe uninitialised) where fmapFst f = fmap (\(x, y) -> (f x, y)) readLS :: Loader -> IO LoaderState readLS dl = (fmap (fromMaybe uninitialised) . readMVar) (loader_state dl) modifyMbLS_ :: Loader -> (Maybe LoaderState -> IO (Maybe LoaderState)) -> IO () modifyMbLS_ dl f = modifyMVar_ (loader_state dl) f emptyLS :: LoaderState emptyLS = LoaderState { closure_env = emptyNameEnv , itbl_env = emptyNameEnv , pkgs_loaded = init_pkgs , bcos_loaded = [] , objs_loaded = [] , temp_sos = [] } -- Packages that don't need loading, because the compiler -- shares them with the interpreted program. -- -- The linker's symbol table is populated with RTS symbols using an -- explicit list. See rts/Linker.c for details. where init_pkgs = [rtsUnitId] extendLoadedPkgs :: Loader -> [UnitId] -> IO () extendLoadedPkgs dl pkgs = modifyLS_ dl $ \s -> return s{ pkgs_loaded = pkgs ++ pkgs_loaded s } extendLoadedEnv :: Loader -> [(Name,ForeignHValue)] -> IO () extendLoadedEnv dl new_bindings = modifyLS_ dl $ \pls@LoaderState{..} -> do let new_ce = extendClosureEnv closure_env new_bindings return $! pls{ closure_env = new_ce } -- strictness is important for not retaining old copies of the pls deleteFromLoadedEnv :: Loader -> [Name] -> IO () deleteFromLoadedEnv dl to_remove = modifyLS_ dl $ \pls -> do let ce = closure_env pls let new_ce = delListFromNameEnv ce to_remove return pls{ closure_env = new_ce } -- | Load the module containing the given Name and get its associated 'HValue'. -- -- Throws a 'ProgramError' if loading fails or the name cannot be found. loadName :: HscEnv -> Name -> IO ForeignHValue loadName hsc_env name = do let dl = hsc_loader hsc_env initLoaderState hsc_env modifyLS dl $ \pls0 -> do pls <- if not (isExternalName name) then return pls0 else do (pls', ok) <- loadDependencies hsc_env pls0 noSrcSpan [nameModule name] if failed ok then throwGhcExceptionIO (ProgramError "") else return pls' case lookupNameEnv (closure_env pls) name of Just (_,aa) -> return (pls,aa) Nothing -> ASSERT2(isExternalName name, ppr name) do let sym_to_find = nameToCLabel name "closure" m <- lookupClosure hsc_env (unpackFS sym_to_find) r <- case m of Just hvref -> mkFinalizedHValue hsc_env hvref Nothing -> linkFail "GHC.Linker.Loader.loadName" (unpackFS sym_to_find) return (pls,r) loadDependencies :: HscEnv -> LoaderState -> SrcSpan -> [Module] -> IO (LoaderState, SuccessFlag) loadDependencies hsc_env pls span needed_mods = do -- initLoaderState (hsc_dflags hsc_env) dl let hpt = hsc_HPT hsc_env -- The interpreter and dynamic linker can only handle object code built -- the "normal" way, i.e. no non-std ways like profiling or ticky-ticky. -- So here we check the build tag: if we're building a non-standard way -- then we need to find & link object files built the "normal" way. maybe_normal_osuf <- checkNonStdWay hsc_env span -- Find what packages and linkables are required (lnks, pkgs) <- getLinkDeps hsc_env hpt pls maybe_normal_osuf span needed_mods -- Link the packages and modules required pls1 <- loadPackages' hsc_env pkgs pls loadModules hsc_env pls1 lnks -- | Temporarily extend the loaded env. withExtendedLoadedEnv :: (ExceptionMonad m) => Loader -> [(Name,ForeignHValue)] -> m a -> m a withExtendedLoadedEnv dl new_env action = MC.bracket (liftIO $ extendLoadedEnv dl new_env) (\_ -> reset_old_env) (\_ -> action) where -- Remember that the linker state might be side-effected -- during the execution of the IO action, and we don't want to -- lose those changes (we might have linked a new module or -- package), so the reset action only removes the names we -- added earlier. reset_old_env = liftIO $ modifyLS_ dl $ \pls -> let cur = closure_env pls new = delListFromNameEnv cur (map fst new_env) in return pls{ closure_env = new } -- | Display the persistent linker state. showLoaderState :: Loader -> IO SDoc showLoaderState dl = do pls <- readLS dl return $ withPprStyle defaultDumpStyle (vcat [text "----- Loader state -----", text "Pkgs:" <+> ppr (pkgs_loaded pls), text "Objs:" <+> ppr (objs_loaded pls), text "BCOs:" <+> ppr (bcos_loaded pls)]) {- ********************************************************************** Initialisation ********************************************************************* -} -- | Initialise the dynamic linker. This entails -- -- a) Calling the C initialisation procedure, -- -- b) Loading any packages specified on the command line, -- -- c) Loading any packages specified on the command line, now held in the -- @-l@ options in @v_Opt_l@, -- -- d) Loading any @.o\/.dll@ files specified on the command line, now held -- in @ldInputs@, -- -- e) Loading any MacOS frameworks. -- -- NOTE: This function is idempotent; if called more than once, it does -- nothing. This is useful in Template Haskell, where we call it before -- trying to link. -- initLoaderState :: HscEnv -> IO () initLoaderState hsc_env = do let dl = hsc_loader hsc_env modifyMbLS_ dl $ \pls -> do case pls of Just _ -> return pls Nothing -> Just <$> reallyInitLoaderState hsc_env reallyInitLoaderState :: HscEnv -> IO LoaderState reallyInitLoaderState hsc_env = do -- Initialise the linker state let pls0 = emptyLS -- (a) initialise the C dynamic linker initObjLinker hsc_env -- (b) Load packages from the command-line (Note [preload packages]) pls <- loadPackages' hsc_env (preloadUnits (hsc_units hsc_env)) pls0 -- steps (c), (d) and (e) loadCmdLineLibs' hsc_env pls loadCmdLineLibs :: HscEnv -> IO () loadCmdLineLibs hsc_env = do let dl = hsc_loader hsc_env initLoaderState hsc_env modifyLS_ dl $ \pls -> loadCmdLineLibs' hsc_env pls loadCmdLineLibs' :: HscEnv -> LoaderState -> IO LoaderState loadCmdLineLibs' hsc_env pls = do let dflags@(DynFlags { ldInputs = cmdline_ld_inputs , libraryPaths = lib_paths_base}) = hsc_dflags hsc_env let logger = hsc_logger hsc_env -- (c) Link libraries from the command-line let minus_ls_1 = [ lib | Option ('-':'l':lib) <- cmdline_ld_inputs ] -- On Windows we want to add libpthread by default just as GCC would. -- However because we don't know the actual name of pthread's dll we -- need to defer this to the locateLib call so we can't initialize it -- inside of the rts. Instead we do it here to be able to find the -- import library for pthreads. See #13210. let platform = targetPlatform dflags os = platformOS platform minus_ls = case os of OSMinGW32 -> "pthread" : minus_ls_1 _ -> minus_ls_1 -- See Note [Fork/Exec Windows] gcc_paths <- getGCCPaths logger dflags os lib_paths_env <- addEnvPaths "LIBRARY_PATH" lib_paths_base maybePutStrLn logger dflags "Search directories (user):" maybePutStr logger dflags (unlines $ map (" "++) lib_paths_env) maybePutStrLn logger dflags "Search directories (gcc):" maybePutStr logger dflags (unlines $ map (" "++) gcc_paths) libspecs <- mapM (locateLib hsc_env False lib_paths_env gcc_paths) minus_ls -- (d) Link .o files from the command-line classified_ld_inputs <- mapM (classifyLdInput logger dflags) [ f | FileOption _ f <- cmdline_ld_inputs ] -- (e) Link any MacOS frameworks let platform = targetPlatform dflags let (framework_paths, frameworks) = if platformUsesFrameworks platform then (frameworkPaths dflags, cmdlineFrameworks dflags) else ([],[]) -- Finally do (c),(d),(e) let cmdline_lib_specs = catMaybes classified_ld_inputs ++ libspecs ++ map Framework frameworks if null cmdline_lib_specs then return pls else do -- Add directories to library search paths, this only has an effect -- on Windows. On Unix OSes this function is a NOP. let all_paths = let paths = takeDirectory (pgm_c dflags) : framework_paths ++ lib_paths_base ++ [ takeDirectory dll | DLLPath dll <- libspecs ] in nub $ map normalise paths let lib_paths = nub $ lib_paths_base ++ gcc_paths all_paths_env <- addEnvPaths "LD_LIBRARY_PATH" all_paths pathCache <- mapM (addLibrarySearchPath hsc_env) all_paths_env let merged_specs = mergeStaticObjects cmdline_lib_specs pls1 <- foldM (preloadLib hsc_env lib_paths framework_paths) pls merged_specs maybePutStr logger dflags "final link ... " ok <- resolveObjs hsc_env -- DLLs are loaded, reset the search paths mapM_ (removeLibrarySearchPath hsc_env) $ reverse pathCache if succeeded ok then maybePutStrLn logger dflags "done" else throwGhcExceptionIO (ProgramError "linking extra libraries/objects failed") return pls1 -- | Merge runs of consecutive of 'Objects'. This allows for resolution of -- cyclic symbol references when dynamically linking. Specifically, we link -- together all of the static objects into a single shared object, avoiding -- the issue we saw in #13786. mergeStaticObjects :: [LibrarySpec] -> [LibrarySpec] mergeStaticObjects specs = go [] specs where go :: [FilePath] -> [LibrarySpec] -> [LibrarySpec] go accum (Objects objs : rest) = go (objs ++ accum) rest go accum@(_:_) rest = Objects (reverse accum) : go [] rest go [] (spec:rest) = spec : go [] rest go [] [] = [] {- Note [preload packages] Why do we need to preload packages from the command line? This is an explanation copied from #2437: I tried to implement the suggestion from #3560, thinking it would be easy, but there are two reasons we link in packages eagerly when they are mentioned on the command line: * So that you can link in extra object files or libraries that depend on the packages. e.g. ghc -package foo -lbar where bar is a C library that depends on something in foo. So we could link in foo eagerly if and only if there are extra C libs or objects to link in, but.... * Haskell code can depend on a C function exported by a package, and the normal dependency tracking that TH uses can't know about these dependencies. The test ghcilink004 relies on this, for example. I conclude that we need two -package flags: one that says "this is a package I want to make available", and one that says "this is a package I want to link in eagerly". Would that be too complicated for users? -} classifyLdInput :: Logger -> DynFlags -> FilePath -> IO (Maybe LibrarySpec) classifyLdInput logger dflags f | isObjectFilename platform f = return (Just (Objects [f])) | isDynLibFilename platform f = return (Just (DLLPath f)) | otherwise = do putLogMsg logger dflags NoReason SevInfo noSrcSpan $ withPprStyle defaultUserStyle (text ("Warning: ignoring unrecognised input `" ++ f ++ "'")) return Nothing where platform = targetPlatform dflags preloadLib :: HscEnv -> [String] -> [String] -> LoaderState -> LibrarySpec -> IO LoaderState preloadLib hsc_env lib_paths framework_paths pls lib_spec = do maybePutStr logger dflags ("Loading object " ++ showLS lib_spec ++ " ... ") case lib_spec of Objects static_ishs -> do (b, pls1) <- preload_statics lib_paths static_ishs maybePutStrLn logger dflags (if b then "done" else "not found") return pls1 Archive static_ish -> do b <- preload_static_archive lib_paths static_ish maybePutStrLn logger dflags (if b then "done" else "not found") return pls DLL dll_unadorned -> do maybe_errstr <- loadDLL hsc_env (platformSOName platform dll_unadorned) case maybe_errstr of Nothing -> maybePutStrLn logger dflags "done" Just mm | platformOS platform /= OSDarwin -> preloadFailed mm lib_paths lib_spec Just mm | otherwise -> do -- As a backup, on Darwin, try to also load a .so file -- since (apparently) some things install that way - see -- ticket #8770. let libfile = ("lib" ++ dll_unadorned) <.> "so" err2 <- loadDLL hsc_env libfile case err2 of Nothing -> maybePutStrLn logger dflags "done" Just _ -> preloadFailed mm lib_paths lib_spec return pls DLLPath dll_path -> do do maybe_errstr <- loadDLL hsc_env dll_path case maybe_errstr of Nothing -> maybePutStrLn logger dflags "done" Just mm -> preloadFailed mm lib_paths lib_spec return pls Framework framework -> if platformUsesFrameworks (targetPlatform dflags) then do maybe_errstr <- loadFramework hsc_env framework_paths framework case maybe_errstr of Nothing -> maybePutStrLn logger dflags "done" Just mm -> preloadFailed mm framework_paths lib_spec return pls else throwGhcExceptionIO (ProgramError "preloadLib Framework") where dflags = hsc_dflags hsc_env logger = hsc_logger hsc_env platform = targetPlatform dflags preloadFailed :: String -> [String] -> LibrarySpec -> IO () preloadFailed sys_errmsg paths spec = do maybePutStr logger dflags "failed.\n" throwGhcExceptionIO $ CmdLineError ( "user specified .o/.so/.DLL could not be loaded (" ++ sys_errmsg ++ ")\nWhilst trying to load: " ++ showLS spec ++ "\nAdditional directories searched:" ++ (if null paths then " (none)" else intercalate "\n" (map (" "++) paths))) -- Not interested in the paths in the static case. preload_statics _paths names = do b <- or <$> mapM doesFileExist names if not b then return (False, pls) else if hostIsDynamic then do pls1 <- dynLoadObjs hsc_env pls names return (True, pls1) else do mapM_ (loadObj hsc_env) names return (True, pls) preload_static_archive _paths name = do b <- doesFileExist name if not b then return False else do if hostIsDynamic then throwGhcExceptionIO $ CmdLineError dynamic_msg else loadArchive hsc_env name return True where dynamic_msg = unlines [ "User-specified static library could not be loaded (" ++ name ++ ")" , "Loading static libraries is not supported in this configuration." , "Try using a dynamic library instead." ] {- ********************************************************************** Link a byte-code expression ********************************************************************* -} -- | Load a single expression, /including/ first loading packages and -- modules that this expression depends on. -- -- Raises an IO exception ('ProgramError') if it can't find a compiled -- version of the dependents to load. -- loadExpr :: HscEnv -> SrcSpan -> UnlinkedBCO -> IO ForeignHValue loadExpr hsc_env span root_ul_bco = do { -- Initialise the linker (if it's not been done already) ; initLoaderState hsc_env -- Extract the Loader value for passing into required places ; let dl = hsc_loader hsc_env -- Take lock for the actual work. ; modifyLS dl $ \pls0 -> do { -- Load the packages and modules required ; (pls, ok) <- loadDependencies hsc_env pls0 span needed_mods ; if failed ok then throwGhcExceptionIO (ProgramError "") else do { -- Load the expression itself let ie = itbl_env pls ce = closure_env pls -- Load the necessary packages and linkables ; let nobreakarray = error "no break array" bco_ix = mkNameEnv [(unlinkedBCOName root_ul_bco, 0)] ; resolved <- linkBCO hsc_env ie ce bco_ix nobreakarray root_ul_bco ; [root_hvref] <- createBCOs hsc_env [resolved] ; fhv <- mkFinalizedHValue hsc_env root_hvref ; return (pls, fhv) }}} where free_names = uniqDSetToList (bcoFreeNames root_ul_bco) needed_mods :: [Module] needed_mods = [ nameModule n | n <- free_names, isExternalName n, -- Names from other modules not (isWiredInName n) -- Exclude wired-in names ] -- (see note below) -- Exclude wired-in names because we may not have read -- their interface files, so getLinkDeps will fail -- All wired-in names are in the base package, which we link -- by default, so we can safely ignore them here. dieWith :: DynFlags -> SrcSpan -> SDoc -> IO a dieWith dflags span msg = throwGhcExceptionIO (ProgramError (showSDoc dflags (mkLocMessage SevFatal span msg))) checkNonStdWay :: HscEnv -> SrcSpan -> IO (Maybe FilePath) checkNonStdWay hsc_env srcspan | Just (ExternalInterp {}) <- hsc_interp hsc_env = return Nothing -- with -fexternal-interpreter we load the .o files, whatever way -- they were built. If they were built for a non-std way, then -- we will use the appropriate variant of the iserv binary to load them. | hostFullWays == targetFullWays = return Nothing -- Only if we are compiling with the same ways as GHC is built -- with, can we dynamically load those object files. (see #3604) | objectSuf (hsc_dflags hsc_env) == normalObjectSuffix && not (null targetFullWays) = failNonStd (hsc_dflags hsc_env) srcspan | otherwise = return (Just (hostWayTag ++ "o")) where targetFullWays = fullWays (ways (hsc_dflags hsc_env)) hostWayTag = case waysTag hostFullWays of "" -> "" tag -> tag ++ "_" normalObjectSuffix :: String normalObjectSuffix = phaseInputExt StopLn failNonStd :: DynFlags -> SrcSpan -> IO (Maybe FilePath) failNonStd dflags srcspan = dieWith dflags srcspan $ text "Cannot load" <+> compWay <+> text "objects when GHC is built" <+> ghciWay $$ text "To fix this, either:" $$ text " (1) Use -fexternal-interpreter, or" $$ text " (2) Build the program twice: once" <+> ghciWay <> text ", and then" $$ text " with" <+> compWay <+> text "using -osuf to set a different object file suffix." where compWay | WayDyn `elem` ways dflags = text "-dynamic" | WayProf `elem` ways dflags = text "-prof" | otherwise = text "normal" ghciWay | hostIsDynamic = text "with -dynamic" | hostIsProfiled = text "with -prof" | otherwise = text "the normal way" getLinkDeps :: HscEnv -> HomePackageTable -> LoaderState -> Maybe FilePath -- replace object suffices? -> SrcSpan -- for error messages -> [Module] -- If you need these -> IO ([Linkable], [UnitId]) -- ... then link these first -- Fails with an IO exception if it can't find enough files getLinkDeps hsc_env hpt pls replace_osuf span mods -- Find all the packages and linkables that a set of modules depends on = do { -- 1. Find the dependent home-pkg-modules/packages from each iface -- (omitting modules from the interactive package, which is already linked) ; (mods_s, pkgs_s) <- follow_deps (filterOut isInteractiveModule mods) emptyUniqDSet emptyUniqDSet; ; let { -- 2. Exclude ones already linked -- Main reason: avoid findModule calls in get_linkable mods_needed = mods_s `minusList` linked_mods ; pkgs_needed = pkgs_s `minusList` pkgs_loaded pls ; linked_mods = map (moduleName.linkableModule) (objs_loaded pls ++ bcos_loaded pls) } -- 3. For each dependent module, find its linkable -- This will either be in the HPT or (in the case of one-shot -- compilation) we may need to use maybe_getFileLinkable ; let { osuf = objectSuf dflags } ; lnks_needed <- mapM (get_linkable osuf) mods_needed ; return (lnks_needed, pkgs_needed) } where dflags = hsc_dflags hsc_env -- The ModIface contains the transitive closure of the module dependencies -- within the current package, *except* for boot modules: if we encounter -- a boot module, we have to find its real interface and discover the -- dependencies of that. Hence we need to traverse the dependency -- tree recursively. See bug #936, testcase ghci/prog007. follow_deps :: [Module] -- modules to follow -> UniqDSet ModuleName -- accum. module dependencies -> UniqDSet UnitId -- accum. package dependencies -> IO ([ModuleName], [UnitId]) -- result follow_deps [] acc_mods acc_pkgs = return (uniqDSetToList acc_mods, uniqDSetToList acc_pkgs) follow_deps (mod:mods) acc_mods acc_pkgs = do mb_iface <- initIfaceCheck (text "getLinkDeps") hsc_env $ loadInterface msg mod (ImportByUser NotBoot) iface <- case mb_iface of Maybes.Failed err -> throwGhcExceptionIO (ProgramError (showSDoc dflags err)) Maybes.Succeeded iface -> return iface when (mi_boot iface == IsBoot) $ link_boot_mod_error mod let pkg = moduleUnit mod deps = mi_deps iface home_unit = hsc_home_unit hsc_env pkg_deps = dep_pkgs deps (boot_deps, mod_deps) = flip partitionWith (dep_mods deps) $ \ (GWIB { gwib_mod = m, gwib_isBoot = is_boot }) -> m & case is_boot of IsBoot -> Left NotBoot -> Right boot_deps' = filter (not . (`elementOfUniqDSet` acc_mods)) boot_deps acc_mods' = addListToUniqDSet acc_mods (moduleName mod : mod_deps) acc_pkgs' = addListToUniqDSet acc_pkgs $ map fst pkg_deps -- if not (isHomeUnit home_unit pkg) then follow_deps mods acc_mods (addOneToUniqDSet acc_pkgs' (toUnitId pkg)) else follow_deps (map (mkHomeModule home_unit) boot_deps' ++ mods) acc_mods' acc_pkgs' where msg = text "need to link module" <+> ppr mod <+> text "due to use of Template Haskell" link_boot_mod_error mod = throwGhcExceptionIO (ProgramError (showSDoc dflags ( text "module" <+> ppr mod <+> text "cannot be linked; it is only available as a boot module"))) no_obj :: Outputable a => a -> IO b no_obj mod = dieWith dflags span $ text "cannot find object file for module " <> quotes (ppr mod) $$ while_linking_expr while_linking_expr = text "while linking an interpreted expression" -- This one is a build-system bug get_linkable osuf mod_name -- A home-package module | Just mod_info <- lookupHpt hpt mod_name = adjust_linkable (Maybes.expectJust "getLinkDeps" (hm_linkable mod_info)) | otherwise = do -- It's not in the HPT because we are in one shot mode, -- so use the Finder to get a ModLocation... mb_stuff <- findHomeModule hsc_env mod_name case mb_stuff of Found loc mod -> found loc mod _ -> no_obj mod_name where found loc mod = do { -- ...and then find the linkable for it mb_lnk <- findObjectLinkableMaybe mod loc ; case mb_lnk of { Nothing -> no_obj mod ; Just lnk -> adjust_linkable lnk }} adjust_linkable lnk | Just new_osuf <- replace_osuf = do new_uls <- mapM (adjust_ul new_osuf) (linkableUnlinked lnk) return lnk{ linkableUnlinked=new_uls } | otherwise = return lnk adjust_ul new_osuf (DotO file) = do MASSERT(osuf `isSuffixOf` file) let file_base = fromJust (stripExtension osuf file) new_file = file_base <.> new_osuf ok <- doesFileExist new_file if (not ok) then dieWith dflags span $ text "cannot find object file " <> quotes (text new_file) $$ while_linking_expr else return (DotO new_file) adjust_ul _ (DotA fp) = panic ("adjust_ul DotA " ++ show fp) adjust_ul _ (DotDLL fp) = panic ("adjust_ul DotDLL " ++ show fp) adjust_ul _ l@(BCOs {}) = return l {- ********************************************************************** Loading a Decls statement ********************************************************************* -} loadDecls :: HscEnv -> SrcSpan -> CompiledByteCode -> IO () loadDecls hsc_env span cbc@CompiledByteCode{..} = do -- Initialise the linker (if it's not been done already) initLoaderState hsc_env -- Extract the Loader for passing into required places let dl = hsc_loader hsc_env -- Take lock for the actual work. modifyLS_ dl $ \pls0 -> do -- Link the packages and modules required (pls, ok) <- loadDependencies hsc_env pls0 span needed_mods if failed ok then throwGhcExceptionIO (ProgramError "") else do -- Link the expression itself let ie = plusNameEnv (itbl_env pls) bc_itbls ce = closure_env pls -- Link the necessary packages and linkables new_bindings <- linkSomeBCOs hsc_env ie ce [cbc] nms_fhvs <- makeForeignNamedHValueRefs hsc_env new_bindings let pls2 = pls { closure_env = extendClosureEnv ce nms_fhvs , itbl_env = ie } return pls2 where free_names = uniqDSetToList $ foldr (unionUniqDSets . bcoFreeNames) emptyUniqDSet bc_bcos needed_mods :: [Module] needed_mods = [ nameModule n | n <- free_names, isExternalName n, -- Names from other modules not (isWiredInName n) -- Exclude wired-in names ] -- (see note below) -- Exclude wired-in names because we may not have read -- their interface files, so getLinkDeps will fail -- All wired-in names are in the base package, which we link -- by default, so we can safely ignore them here. {- ********************************************************************** Loading a single module ********************************************************************* -} loadModule :: HscEnv -> Module -> IO () loadModule hsc_env mod = do initLoaderState hsc_env let dl = hsc_loader hsc_env modifyLS_ dl $ \pls -> do (pls', ok) <- loadDependencies hsc_env pls noSrcSpan [mod] if failed ok then throwGhcExceptionIO (ProgramError "could not load module") else return pls' {- ********************************************************************** Link some linkables The linkables may consist of a mixture of byte-code modules and object modules ********************************************************************* -} loadModules :: HscEnv -> LoaderState -> [Linkable] -> IO (LoaderState, SuccessFlag) loadModules hsc_env pls linkables = mask_ $ do -- don't want to be interrupted by ^C in here let (objs, bcos) = partition isObjectLinkable (concatMap partitionLinkable linkables) -- Load objects first; they can't depend on BCOs (pls1, ok_flag) <- loadObjects hsc_env pls objs if failed ok_flag then return (pls1, Failed) else do pls2 <- dynLinkBCOs hsc_env pls1 bcos return (pls2, Succeeded) -- HACK to support f-x-dynamic in the interpreter; no other purpose partitionLinkable :: Linkable -> [Linkable] partitionLinkable li = let li_uls = linkableUnlinked li li_uls_obj = filter isObject li_uls li_uls_bco = filter isInterpretable li_uls in case (li_uls_obj, li_uls_bco) of (_:_, _:_) -> [li {linkableUnlinked=li_uls_obj}, li {linkableUnlinked=li_uls_bco}] _ -> [li] findModuleLinkable_maybe :: [Linkable] -> Module -> Maybe Linkable findModuleLinkable_maybe lis mod = case [LM time nm us | LM time nm us <- lis, nm == mod] of [] -> Nothing [li] -> Just li _ -> pprPanic "findModuleLinkable" (ppr mod) linkableInSet :: Linkable -> [Linkable] -> Bool linkableInSet l objs_loaded = case findModuleLinkable_maybe objs_loaded (linkableModule l) of Nothing -> False Just m -> linkableTime l == linkableTime m {- ********************************************************************** The object-code linker ********************************************************************* -} -- | Load the object files and link them -- -- If the interpreter uses dynamic-linking, build a shared library and load it. -- Otherwise, use the RTS linker. loadObjects :: HscEnv -> LoaderState -> [Linkable] -> IO (LoaderState, SuccessFlag) loadObjects hsc_env pls objs = do let (objs_loaded', new_objs) = rmDupLinkables (objs_loaded pls) objs pls1 = pls { objs_loaded = objs_loaded' } unlinkeds = concatMap linkableUnlinked new_objs wanted_objs = map nameOfObject unlinkeds if interpreterDynamic (hscInterp hsc_env) then do pls2 <- dynLoadObjs hsc_env pls1 wanted_objs return (pls2, Succeeded) else do mapM_ (loadObj hsc_env) wanted_objs -- Link them all together ok <- resolveObjs hsc_env -- If resolving failed, unload all our -- object modules and carry on if succeeded ok then return (pls1, Succeeded) else do pls2 <- unload_wkr hsc_env [] pls1 return (pls2, Failed) -- | Create a shared library containing the given object files and load it. dynLoadObjs :: HscEnv -> LoaderState -> [FilePath] -> IO LoaderState dynLoadObjs _ pls [] = return pls dynLoadObjs hsc_env pls@LoaderState{..} objs = do let unit_env = hsc_unit_env hsc_env let dflags = hsc_dflags hsc_env let logger = hsc_logger hsc_env let platform = ue_platform unit_env let minus_ls = [ lib | Option ('-':'l':lib) <- ldInputs dflags ] let minus_big_ls = [ lib | Option ('-':'L':lib) <- ldInputs dflags ] (soFile, libPath , libName) <- newTempLibName logger dflags TFL_CurrentModule (platformSOExt platform) let dflags2 = dflags { -- We don't want the original ldInputs in -- (they're already linked in), but we do want -- to link against previous dynLoadObjs -- libraries if there were any, so that the linker -- can resolve dependencies when it loads this -- library. ldInputs = concatMap (\l -> [ Option ("-l" ++ l) ]) (nub $ snd <$> temp_sos) ++ concatMap (\lp -> Option ("-L" ++ lp) : if gopt Opt_RPath dflags then [ Option "-Xlinker" , Option "-rpath" , Option "-Xlinker" , Option lp ] else []) (nub $ fst <$> temp_sos) ++ concatMap (\lp -> Option ("-L" ++ lp) : if gopt Opt_RPath dflags then [ Option "-Xlinker" , Option "-rpath" , Option "-Xlinker" , Option lp ] else []) minus_big_ls -- See Note [-Xlinker -rpath vs -Wl,-rpath] ++ map (\l -> Option ("-l" ++ l)) minus_ls, -- Add -l options and -L options from dflags. -- -- When running TH for a non-dynamic way, we still -- need to make -l flags to link against the dynamic -- libraries, so we need to add WayDyn to ways. -- -- Even if we're e.g. profiling, we still want -- the vanilla dynamic libraries, so we set the -- ways / build tag to be just WayDyn. targetWays_ = Set.singleton WayDyn, outputFile_ = Just soFile } -- link all "loaded packages" so symbols in those can be resolved -- Note: We are loading packages with local scope, so to see the -- symbols in this link we must link all loaded packages again. linkDynLib logger dflags2 unit_env objs pkgs_loaded -- if we got this far, extend the lifetime of the library file changeTempFilesLifetime dflags TFL_GhcSession [soFile] m <- loadDLL hsc_env soFile case m of Nothing -> return $! pls { temp_sos = (libPath, libName) : temp_sos } Just err -> linkFail msg err where msg = "GHC.Linker.Loader.dynLoadObjs: Loading temp shared object failed" rmDupLinkables :: [Linkable] -- Already loaded -> [Linkable] -- New linkables -> ([Linkable], -- New loaded set (including new ones) [Linkable]) -- New linkables (excluding dups) rmDupLinkables already ls = go already [] ls where go already extras [] = (already, extras) go already extras (l:ls) | linkableInSet l already = go already extras ls | otherwise = go (l:already) (l:extras) ls {- ********************************************************************** The byte-code linker ********************************************************************* -} dynLinkBCOs :: HscEnv -> LoaderState -> [Linkable] -> IO LoaderState dynLinkBCOs hsc_env pls bcos = do let (bcos_loaded', new_bcos) = rmDupLinkables (bcos_loaded pls) bcos pls1 = pls { bcos_loaded = bcos_loaded' } unlinkeds :: [Unlinked] unlinkeds = concatMap linkableUnlinked new_bcos cbcs :: [CompiledByteCode] cbcs = map byteCodeOfObject unlinkeds ies = map bc_itbls cbcs gce = closure_env pls final_ie = foldr plusNameEnv (itbl_env pls) ies names_and_refs <- linkSomeBCOs hsc_env final_ie gce cbcs -- We only want to add the external ones to the ClosureEnv let (to_add, to_drop) = partition (isExternalName.fst) names_and_refs -- Immediately release any HValueRefs we're not going to add freeHValueRefs hsc_env (map snd to_drop) -- Wrap finalizers on the ones we want to keep new_binds <- makeForeignNamedHValueRefs hsc_env to_add return pls1 { closure_env = extendClosureEnv gce new_binds, itbl_env = final_ie } -- Link a bunch of BCOs and return references to their values linkSomeBCOs :: HscEnv -> ItblEnv -> ClosureEnv -> [CompiledByteCode] -> IO [(Name,HValueRef)] -- The returned HValueRefs are associated 1-1 with -- the incoming unlinked BCOs. Each gives the -- value of the corresponding unlinked BCO linkSomeBCOs hsc_env ie ce mods = foldr fun do_link mods [] where fun CompiledByteCode{..} inner accum = case bc_breaks of Nothing -> inner ((panic "linkSomeBCOs: no break array", bc_bcos) : accum) Just mb -> withForeignRef (modBreaks_flags mb) $ \breakarray -> inner ((breakarray, bc_bcos) : accum) do_link [] = return [] do_link mods = do let flat = [ (breakarray, bco) | (breakarray, bcos) <- mods, bco <- bcos ] names = map (unlinkedBCOName . snd) flat bco_ix = mkNameEnv (zip names [0..]) resolved <- sequence [ linkBCO hsc_env ie ce bco_ix breakarray bco | (breakarray, bco) <- flat ] hvrefs <- createBCOs hsc_env resolved return (zip names hvrefs) -- | Useful to apply to the result of 'linkSomeBCOs' makeForeignNamedHValueRefs :: HscEnv -> [(Name,HValueRef)] -> IO [(Name,ForeignHValue)] makeForeignNamedHValueRefs hsc_env bindings = mapM (\(n, hvref) -> (n,) <$> mkFinalizedHValue hsc_env hvref) bindings {- ********************************************************************** Unload some object modules ********************************************************************* -} -- --------------------------------------------------------------------------- -- | Unloading old objects ready for a new compilation sweep. -- -- The compilation manager provides us with a list of linkables that it -- considers \"stable\", i.e. won't be recompiled this time around. For -- each of the modules current linked in memory, -- -- * if the linkable is stable (and it's the same one -- the user may have -- recompiled the module on the side), we keep it, -- -- * otherwise, we unload it. -- -- * we also implicitly unload all temporary bindings at this point. -- unload :: HscEnv -> [Linkable] -- ^ The linkables to *keep*. -> IO () unload hsc_env linkables = mask_ $ do -- mask, so we're safe from Ctrl-C in here -- Initialise the linker (if it's not been done already) initLoaderState hsc_env -- Extract Loader for passing into required places let dl = hsc_loader hsc_env new_pls <- modifyLS dl $ \pls -> do pls1 <- unload_wkr hsc_env linkables pls return (pls1, pls1) let dflags = hsc_dflags hsc_env let logger = hsc_logger hsc_env debugTraceMsg logger dflags 3 $ text "unload: retaining objs" <+> ppr (objs_loaded new_pls) debugTraceMsg logger dflags 3 $ text "unload: retaining bcos" <+> ppr (bcos_loaded new_pls) return () unload_wkr :: HscEnv -> [Linkable] -- stable linkables -> LoaderState -> IO LoaderState -- Does the core unload business -- (the wrapper blocks exceptions and deals with the LS get and put) unload_wkr hsc_env keep_linkables pls@LoaderState{..} = do -- NB. careful strictness here to avoid keeping the old LS when -- we're unloading some code. -fghci-leak-check with the tests in -- testsuite/ghci can detect space leaks here. let (objs_to_keep, bcos_to_keep) = partition isObjectLinkable keep_linkables discard keep l = not (linkableInSet l keep) (objs_to_unload, remaining_objs_loaded) = partition (discard objs_to_keep) objs_loaded (bcos_to_unload, remaining_bcos_loaded) = partition (discard bcos_to_keep) bcos_loaded mapM_ unloadObjs objs_to_unload mapM_ unloadObjs bcos_to_unload -- If we unloaded any object files at all, we need to purge the cache -- of lookupSymbol results. when (not (null (objs_to_unload ++ filter (not . null . linkableObjs) bcos_to_unload))) $ purgeLookupSymbolCache hsc_env let !bcos_retained = mkModuleSet $ map linkableModule remaining_bcos_loaded -- Note that we want to remove all *local* -- (i.e. non-isExternal) names too (these are the -- temporary bindings from the command line). keep_name :: (Name, a) -> Bool keep_name (n,_) = isExternalName n && nameModule n `elemModuleSet` bcos_retained itbl_env' = filterNameEnv keep_name itbl_env closure_env' = filterNameEnv keep_name closure_env !new_pls = pls { itbl_env = itbl_env', closure_env = closure_env', bcos_loaded = remaining_bcos_loaded, objs_loaded = remaining_objs_loaded } return new_pls where unloadObjs :: Linkable -> IO () unloadObjs lnk -- The RTS's PEi386 linker currently doesn't support unloading. | isWindowsHost = return () | hostIsDynamic = return () -- We don't do any cleanup when linking objects with the -- dynamic linker. Doing so introduces extra complexity for -- not much benefit. | otherwise = mapM_ (unloadObj hsc_env) [f | DotO f <- linkableUnlinked lnk] -- The components of a BCO linkable may contain -- dot-o files. Which is very confusing. -- -- But the BCO parts can be unlinked just by -- letting go of them (plus of course depopulating -- the symbol table which is done in the main body) {- ********************************************************************** Loading packages ********************************************************************* -} data LibrarySpec = Objects [FilePath] -- Full path names of set of .o files, including trailing .o -- We allow batched loading to ensure that cyclic symbol -- references can be resolved (see #13786). -- For dynamic objects only, try to find the object -- file in all the directories specified in -- v_Library_paths before giving up. | Archive FilePath -- Full path name of a .a file, including trailing .a | DLL String -- "Unadorned" name of a .DLL/.so -- e.g. On unix "qt" denotes "libqt.so" -- On Windows "burble" denotes "burble.DLL" or "libburble.dll" -- loadDLL is platform-specific and adds the lib/.so/.DLL -- suffixes platform-dependently | DLLPath FilePath -- Absolute or relative pathname to a dynamic library -- (ends with .dll or .so). | Framework String -- Only used for darwin, but does no harm instance Outputable LibrarySpec where ppr (Objects objs) = text "Objects" <+> ppr objs ppr (Archive a) = text "Archive" <+> text a ppr (DLL s) = text "DLL" <+> text s ppr (DLLPath f) = text "DLLPath" <+> text f ppr (Framework s) = text "Framework" <+> text s -- If this package is already part of the GHCi binary, we'll already -- have the right DLLs for this package loaded, so don't try to -- load them again. -- -- But on Win32 we must load them 'again'; doing so is a harmless no-op -- as far as the loader is concerned, but it does initialise the list -- of DLL handles that rts/Linker.c maintains, and that in turn is -- used by lookupSymbol. So we must call addDLL for each library -- just to get the DLL handle into the list. partOfGHCi :: [PackageName] partOfGHCi | isWindowsHost || isDarwinHost = [] | otherwise = map (PackageName . mkFastString) ["base", "template-haskell", "editline"] showLS :: LibrarySpec -> String showLS (Objects nms) = "(static) [" ++ intercalate ", " nms ++ "]" showLS (Archive nm) = "(static archive) " ++ nm showLS (DLL nm) = "(dynamic) " ++ nm showLS (DLLPath nm) = "(dynamic) " ++ nm showLS (Framework nm) = "(framework) " ++ nm -- | Load exactly the specified packages, and their dependents (unless of -- course they are already loaded). The dependents are loaded -- automatically, and it doesn't matter what order you specify the input -- packages. -- loadPackages :: HscEnv -> [UnitId] -> IO () -- NOTE: in fact, since each module tracks all the packages it depends on, -- we don't really need to use the package-config dependencies. -- -- However we do need the package-config stuff (to find aux libs etc), -- and following them lets us load libraries in the right order, which -- perhaps makes the error message a bit more localised if we get a link -- failure. So the dependency walking code is still here. loadPackages hsc_env new_pkgs = do -- It's probably not safe to try to load packages concurrently, so we take -- a lock. initLoaderState hsc_env let dl = hsc_loader hsc_env modifyLS_ dl $ \pls -> loadPackages' hsc_env new_pkgs pls loadPackages' :: HscEnv -> [UnitId] -> LoaderState -> IO LoaderState loadPackages' hsc_env new_pks pls = do pkgs' <- link (pkgs_loaded pls) new_pks return $! pls { pkgs_loaded = pkgs' } where link :: [UnitId] -> [UnitId] -> IO [UnitId] link pkgs new_pkgs = foldM link_one pkgs new_pkgs link_one pkgs new_pkg | new_pkg `elem` pkgs -- Already linked = return pkgs | Just pkg_cfg <- lookupUnitId (hsc_units hsc_env) new_pkg = do { -- Link dependents first pkgs' <- link pkgs (unitDepends pkg_cfg) -- Now link the package itself ; loadPackage hsc_env pkg_cfg ; return (new_pkg : pkgs') } | otherwise = throwGhcExceptionIO (CmdLineError ("unknown package: " ++ unpackFS (unitIdFS new_pkg))) loadPackage :: HscEnv -> UnitInfo -> IO () loadPackage hsc_env pkg = do let dflags = hsc_dflags hsc_env let logger = hsc_logger hsc_env platform = targetPlatform dflags is_dyn = interpreterDynamic (hscInterp hsc_env) dirs | is_dyn = map ST.unpack $ Packages.unitLibraryDynDirs pkg | otherwise = map ST.unpack $ Packages.unitLibraryDirs pkg let hs_libs = map ST.unpack $ Packages.unitLibraries pkg -- The FFI GHCi import lib isn't needed as -- GHC.Linker.Loader + rts/Linker.c link the -- interpreted references to FFI to the compiled FFI. -- We therefore filter it out so that we don't get -- duplicate symbol errors. hs_libs' = filter ("HSffi" /=) hs_libs -- Because of slight differences between the GHC dynamic linker and -- the native system linker some packages have to link with a -- different list of libraries when using GHCi. Examples include: libs -- that are actually gnu ld scripts, and the possibility that the .a -- libs do not exactly match the .so/.dll equivalents. So if the -- package file provides an "extra-ghci-libraries" field then we use -- that instead of the "extra-libraries" field. extdeplibs = map ST.unpack (if null (Packages.unitExtDepLibsGhc pkg) then Packages.unitExtDepLibsSys pkg else Packages.unitExtDepLibsGhc pkg) linkerlibs = [ lib | '-':'l':lib <- (map ST.unpack $ Packages.unitLinkerOptions pkg) ] extra_libs = extdeplibs ++ linkerlibs -- See Note [Fork/Exec Windows] gcc_paths <- getGCCPaths logger dflags (platformOS platform) dirs_env <- addEnvPaths "LIBRARY_PATH" dirs hs_classifieds <- mapM (locateLib hsc_env True dirs_env gcc_paths) hs_libs' extra_classifieds <- mapM (locateLib hsc_env False dirs_env gcc_paths) extra_libs let classifieds = hs_classifieds ++ extra_classifieds -- Complication: all the .so's must be loaded before any of the .o's. let known_dlls = [ dll | DLLPath dll <- classifieds ] dlls = [ dll | DLL dll <- classifieds ] objs = [ obj | Objects objs <- classifieds , obj <- objs ] archs = [ arch | Archive arch <- classifieds ] -- Add directories to library search paths let dll_paths = map takeDirectory known_dlls all_paths = nub $ map normalise $ dll_paths ++ dirs all_paths_env <- addEnvPaths "LD_LIBRARY_PATH" all_paths pathCache <- mapM (addLibrarySearchPath hsc_env) all_paths_env maybePutSDoc logger dflags (text "Loading unit " <> pprUnitInfoForUser pkg <> text " ... ") -- See comments with partOfGHCi #if defined(CAN_LOAD_DLL) when (unitPackageName pkg `notElem` partOfGHCi) $ do loadFrameworks hsc_env platform pkg -- See Note [Crash early load_dyn and locateLib] -- Crash early if can't load any of `known_dlls` mapM_ (load_dyn hsc_env True) known_dlls -- For remaining `dlls` crash early only when there is surely -- no package's DLL around ... (not is_dyn) mapM_ (load_dyn hsc_env (not is_dyn) . platformSOName platform) dlls #endif -- After loading all the DLLs, we can load the static objects. -- Ordering isn't important here, because we do one final link -- step to resolve everything. mapM_ (loadObj hsc_env) objs mapM_ (loadArchive hsc_env) archs maybePutStr logger dflags "linking ... " ok <- resolveObjs hsc_env -- DLLs are loaded, reset the search paths -- Import libraries will be loaded via loadArchive so only -- reset the DLL search path after all archives are loaded -- as well. mapM_ (removeLibrarySearchPath hsc_env) $ reverse pathCache if succeeded ok then maybePutStrLn logger dflags "done." else let errmsg = text "unable to load unit `" <> pprUnitInfoForUser pkg <> text "'" in throwGhcExceptionIO (InstallationError (showSDoc dflags errmsg)) {- Note [Crash early load_dyn and locateLib] ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ If a package is "normal" (exposes it's code from more than zero Haskell modules, unlike e.g. that in ghcilink004) and is built "dyn" way, then it has it's code compiled and linked into the DLL, which GHCi linker picks when loading the package's code (see the big comment in the beginning of `locateLib`). When loading DLLs, GHCi linker simply calls the system's `dlopen` or `LoadLibrary` APIs. This is quite different from the case when GHCi linker loads an object file or static library. When loading an object file or static library GHCi linker parses them and resolves all symbols "manually". These object file or static library may reference some external symbols defined in some external DLLs. And GHCi should know which these external DLLs are. But when GHCi loads a DLL, it's the *system* linker who manages all the necessary dependencies, and it is able to load this DLL not having any extra info. Thus we don't *have to* crash in this case even if we are unable to load any supposed dependencies explicitly. Suppose during GHCi session a client of the package wants to `foreign import` a symbol which isn't exposed by the package DLL, but is exposed by such an external (dependency) DLL. If the DLL isn't *explicitly* loaded because `load_dyn` failed to do this, then the client code eventually crashes because the GHCi linker isn't able to locate this symbol (GHCi linker maintains a list of explicitly loaded DLLs it looks into when trying to find a symbol). This is why we still should try to load all the dependency DLLs even though we know that the system linker loads them implicitly when loading the package DLL. Why we still keep the `crash_early` opportunity then not allowing such a permissive behaviour for any DLLs? Well, we, perhaps, improve a user experience in some cases slightly. But if it happens there exist other corner cases where our current usage of `crash_early` flag is overly restrictive, we may lift the restriction very easily. -} -- we have already searched the filesystem; the strings passed to load_dyn -- can be passed directly to loadDLL. They are either fully-qualified -- ("/usr/lib/libfoo.so"), or unqualified ("libfoo.so"). In the latter case, -- loadDLL is going to search the system paths to find the library. load_dyn :: HscEnv -> Bool -> FilePath -> IO () load_dyn hsc_env crash_early dll = do r <- loadDLL hsc_env dll case r of Nothing -> return () Just err -> if crash_early then cmdLineErrorIO err else when (wopt Opt_WarnMissedExtraSharedLib dflags) $ putLogMsg logger dflags (Reason Opt_WarnMissedExtraSharedLib) SevWarning noSrcSpan $ withPprStyle defaultUserStyle (note err) where dflags = hsc_dflags hsc_env logger = hsc_logger hsc_env note err = vcat $ map text [ err , "It's OK if you don't want to use symbols from it directly." , "(the package DLL is loaded by the system linker" , " which manages dependencies by itself)." ] loadFrameworks :: HscEnv -> Platform -> UnitInfo -> IO () loadFrameworks hsc_env platform pkg = when (platformUsesFrameworks platform) $ mapM_ load frameworks where fw_dirs = map ST.unpack $ Packages.unitExtDepFrameworkDirs pkg frameworks = map ST.unpack $ Packages.unitExtDepFrameworks pkg load fw = do r <- loadFramework hsc_env fw_dirs fw case r of Nothing -> return () Just err -> cmdLineErrorIO ("can't load framework: " ++ fw ++ " (" ++ err ++ ")" ) -- Try to find an object file for a given library in the given paths. -- If it isn't present, we assume that addDLL in the RTS can find it, -- which generally means that it should be a dynamic library in the -- standard system search path. -- For GHCi we tend to prefer dynamic libraries over static ones as -- they are easier to load and manage, have less overhead. locateLib :: HscEnv -> Bool -> [FilePath] -> [FilePath] -> String -> IO LibrarySpec locateLib hsc_env is_hs lib_dirs gcc_dirs lib | not is_hs -- For non-Haskell libraries (e.g. gmp, iconv): -- first look in library-dirs for a dynamic library (on User paths only) -- (libfoo.so) -- then try looking for import libraries on Windows (on User paths only) -- (.dll.a, .lib) -- first look in library-dirs for a dynamic library (on GCC paths only) -- (libfoo.so) -- then check for system dynamic libraries (e.g. kernel32.dll on windows) -- then try looking for import libraries on Windows (on GCC paths only) -- (.dll.a, .lib) -- then look in library-dirs for a static library (libfoo.a) -- then look in library-dirs and inplace GCC for a dynamic library (libfoo.so) -- then try looking for import libraries on Windows (.dll.a, .lib) -- then look in library-dirs and inplace GCC for a static library (libfoo.a) -- then try "gcc --print-file-name" to search gcc's search path -- for a dynamic library (#5289) -- otherwise, assume loadDLL can find it -- -- The logic is a bit complicated, but the rationale behind it is that -- loading a shared library for us is O(1) while loading an archive is -- O(n). Loading an import library is also O(n) so in general we prefer -- shared libraries because they are simpler and faster. -- = #if defined(CAN_LOAD_DLL) findDll user `orElse` #endif tryImpLib user `orElse` #if defined(CAN_LOAD_DLL) findDll gcc `orElse` findSysDll `orElse` #endif tryImpLib gcc `orElse` findArchive `orElse` tryGcc `orElse` assumeDll | loading_dynamic_hs_libs -- search for .so libraries first. = findHSDll `orElse` findDynObject `orElse` assumeDll | otherwise -- use HSfoo.{o,p_o} if it exists, otherwise fallback to libHSfoo{,_p}.a = findObject `orElse` findArchive `orElse` assumeDll where dflags = hsc_dflags hsc_env logger = hsc_logger hsc_env interp = hscInterp hsc_env dirs = lib_dirs ++ gcc_dirs gcc = False user = True obj_file | is_hs && loading_profiled_hs_libs = lib <.> "p_o" | otherwise = lib <.> "o" dyn_obj_file = lib <.> "dyn_o" arch_files = [ "lib" ++ lib ++ lib_tag <.> "a" , lib <.> "a" -- native code has no lib_tag , "lib" ++ lib, lib ] lib_tag = if is_hs && loading_profiled_hs_libs then "_p" else "" loading_profiled_hs_libs = interpreterProfiled interp loading_dynamic_hs_libs = interpreterDynamic interp import_libs = [ lib <.> "lib" , "lib" ++ lib <.> "lib" , "lib" ++ lib <.> "dll.a", lib <.> "dll.a" ] hs_dyn_lib_name = lib ++ dynLibSuffix (ghcNameVersion dflags) hs_dyn_lib_file = platformHsSOName platform hs_dyn_lib_name so_name = platformSOName platform lib lib_so_name = "lib" ++ so_name dyn_lib_file = case (arch, os) of (ArchX86_64, OSSolaris2) -> "64" so_name _ -> so_name findObject = liftM (fmap $ Objects . (:[])) $ findFile dirs obj_file findDynObject = liftM (fmap $ Objects . (:[])) $ findFile dirs dyn_obj_file findArchive = let local name = liftM (fmap Archive) $ findFile dirs name in apply (map local arch_files) findHSDll = liftM (fmap DLLPath) $ findFile dirs hs_dyn_lib_file findDll re = let dirs' = if re == user then lib_dirs else gcc_dirs in liftM (fmap DLLPath) $ findFile dirs' dyn_lib_file findSysDll = fmap (fmap $ DLL . dropExtension . takeFileName) $ findSystemLibrary hsc_env so_name tryGcc = let search = searchForLibUsingGcc logger dflags dllpath = liftM (fmap DLLPath) short = dllpath $ search so_name lib_dirs full = dllpath $ search lib_so_name lib_dirs gcc name = liftM (fmap Archive) $ search name lib_dirs files = import_libs ++ arch_files dlls = [short, full] archives = map gcc files in apply $ #if defined(CAN_LOAD_DLL) dlls ++ #endif archives tryImpLib re = case os of OSMinGW32 -> let dirs' = if re == user then lib_dirs else gcc_dirs implib name = liftM (fmap Archive) $ findFile dirs' name in apply (map implib import_libs) _ -> return Nothing -- TH Makes use of the interpreter so this failure is not obvious. -- So we are nice and warn/inform users why we fail before we do. -- But only for haskell libraries, as C libraries don't have a -- profiling/non-profiling distinction to begin with. assumeDll | is_hs , not loading_dynamic_hs_libs , interpreterProfiled interp = do warningMsg logger dflags (text "Interpreter failed to load profiled static library" <+> text lib <> char '.' $$ text " \tTrying dynamic library instead. If this fails try to rebuild" <+> text "libraries with profiling support.") return (DLL lib) | otherwise = return (DLL lib) infixr `orElse` f `orElse` g = f >>= maybe g return apply :: [IO (Maybe a)] -> IO (Maybe a) apply [] = return Nothing apply (x:xs) = do x' <- x if isJust x' then return x' else apply xs platform = targetPlatform dflags arch = platformArch platform os = platformOS platform searchForLibUsingGcc :: Logger -> DynFlags -> String -> [FilePath] -> IO (Maybe FilePath) searchForLibUsingGcc logger dflags so dirs = do -- GCC does not seem to extend the library search path (using -L) when using -- --print-file-name. So instead pass it a new base location. str <- askLd logger dflags (map (FileOption "-B") dirs ++ [Option "--print-file-name", Option so]) let file = case lines str of [] -> "" l:_ -> l if (file == so) then return Nothing else do b <- doesFileExist file -- file could be a folder (see #16063) return (if b then Just file else Nothing) -- | Retrieve the list of search directory GCC and the System use to find -- libraries and components. See Note [Fork/Exec Windows]. getGCCPaths :: Logger -> DynFlags -> OS -> IO [FilePath] getGCCPaths logger dflags os = case os of OSMinGW32 -> do gcc_dirs <- getGccSearchDirectory logger dflags "libraries" sys_dirs <- getSystemDirectories return $ nub $ gcc_dirs ++ sys_dirs _ -> return [] -- | Cache for the GCC search directories as this can't easily change -- during an invocation of GHC. (Maybe with some env. variable but we'll) -- deal with that highly unlikely scenario then. {-# NOINLINE gccSearchDirCache #-} gccSearchDirCache :: IORef [(String, [String])] gccSearchDirCache = unsafePerformIO $ newIORef [] -- Note [Fork/Exec Windows] -- ~~~~~~~~~~~~~~~~~~~~~~~~ -- fork/exec is expensive on Windows, for each time we ask GCC for a library we -- have to eat the cost of af least 3 of these: gcc -> real_gcc -> cc1. -- So instead get a list of location that GCC would search and use findDirs -- which hopefully is written in an optimized mannor to take advantage of -- caching. At the very least we remove the overhead of the fork/exec and waits -- which dominate a large percentage of startup time on Windows. getGccSearchDirectory :: Logger -> DynFlags -> String -> IO [FilePath] getGccSearchDirectory logger dflags key = do cache <- readIORef gccSearchDirCache case lookup key cache of Just x -> return x Nothing -> do str <- askLd logger dflags [Option "--print-search-dirs"] let line = dropWhile isSpace str name = key ++ ": =" if null line then return [] else do let val = split $ find name line dirs <- filterM doesDirectoryExist val modifyIORef' gccSearchDirCache ((key, dirs):) return val where split :: FilePath -> [FilePath] split r = case break (==';') r of (s, [] ) -> [s] (s, (_:xs)) -> s : split xs find :: String -> String -> String find r x = let lst = lines x val = filter (r `isPrefixOf`) lst in if null val then [] else case break (=='=') (head val) of (_ , []) -> [] (_, (_:xs)) -> xs -- | Get a list of system search directories, this to alleviate pressure on -- the findSysDll function. getSystemDirectories :: IO [FilePath] #if defined(mingw32_HOST_OS) getSystemDirectories = fmap (:[]) getSystemDirectory #else getSystemDirectories = return [] #endif -- | Merge the given list of paths with those in the environment variable -- given. If the variable does not exist then just return the identity. addEnvPaths :: String -> [String] -> IO [String] addEnvPaths name list = do -- According to POSIX (chapter 8.3) a zero-length prefix means current -- working directory. Replace empty strings in the env variable with -- `working_dir` (see also #14695). working_dir <- getCurrentDirectory values <- lookupEnv name case values of Nothing -> return list Just arr -> return $ list ++ splitEnv working_dir arr where splitEnv :: FilePath -> String -> [String] splitEnv working_dir value = case break (== envListSep) value of (x, [] ) -> [if null x then working_dir else x] (x, (_:xs)) -> (if null x then working_dir else x) : splitEnv working_dir xs #if defined(mingw32_HOST_OS) envListSep = ';' #else envListSep = ':' #endif -- ---------------------------------------------------------------------------- -- Loading a dynamic library (dlopen()-ish on Unix, LoadLibrary-ish on Win32) {- ********************************************************************** Helper functions ********************************************************************* -} maybePutSDoc :: Logger -> DynFlags -> SDoc -> IO () maybePutSDoc logger dflags s = when (verbosity dflags > 1) $ putLogMsg logger dflags NoReason SevInteractive noSrcSpan $ withPprStyle defaultUserStyle s maybePutStr :: Logger -> DynFlags -> String -> IO () maybePutStr logger dflags s = maybePutSDoc logger dflags (text s) maybePutStrLn :: Logger -> DynFlags -> String -> IO () maybePutStrLn logger dflags s = maybePutSDoc logger dflags (text s <> text "\n")