2 % (c) The University of Glasgow 2000
5 -- --------------------------------------
6 -- The dynamic linker for GHCi
7 -- --------------------------------------
9 This module deals with the top-level issues of dynamic linking,
10 calling the object-code linker and the byte-code linker where
16 {-# OPTIONS -optc-DNON_POSIX_SOURCE -#include "Linker.h" #-}
18 module Linker ( HValue, initDynLinker, showLinkerState,
19 linkExpr, unload, extendLinkEnv,
23 #include "../includes/config.h"
24 #include "HsVersions.h"
26 import ObjLink ( loadDLL, loadObj, unloadObj, resolveObjs, initObjLinker )
27 import ByteCodeLink ( HValue, ClosureEnv, extendClosureEnv, linkBCO )
28 import ByteCodeItbls ( ItblEnv )
29 import ByteCodeAsm ( CompiledByteCode(..), bcoFreeNames, UnlinkedBCO(..))
32 import DriverState ( v_Library_paths, v_Opt_l, v_Ld_inputs, getStaticOpts, v_ExplicitPackages )
33 import DriverPhases ( isObjectFilename, isDynLibFilename )
34 import DriverUtil ( getFileSuffix )
35 #ifdef darwin_TARGET_OS
36 import DriverState ( v_Cmdline_frameworks, v_Framework_paths )
38 import Finder ( findModule, findLinkable )
40 import Name ( Name, nameModule, nameModuleName, isExternalName, isWiredInName )
42 import NameSet ( nameSetToList )
44 import ListSetOps ( minusList )
45 import CmdLineOpts ( DynFlags(verbosity), getDynFlags )
46 import BasicTypes ( SuccessFlag(..), succeeded, failed )
48 import Panic ( GhcException(..) )
49 import Util ( zipLazy, global )
52 import Control.Monad ( when, filterM, foldM )
54 import Data.IORef ( IORef, readIORef, writeIORef )
55 import Data.List ( partition, nub )
57 import System.IO ( putStr, putStrLn, hPutStrLn, stderr, fixIO )
58 import System.Directory ( doesFileExist )
60 import Control.Exception ( block, throwDyn )
62 #if __GLASGOW_HASKELL__ >= 503
63 import GHC.IOBase ( IO(..) )
65 import PrelIOBase ( IO(..) )
70 %************************************************************************
74 %************************************************************************
76 The persistent linker state *must* match the actual state of the
77 C dynamic linker at all times, so we keep it in a private global variable.
80 The PersistentLinkerState maps Names to actual closures (for
81 interpreted code only), for use during linking.
84 GLOBAL_VAR(v_PersistentLinkerState, panic "Dynamic linker not initialised", PersistentLinkerState)
85 GLOBAL_VAR(v_InitLinkerDone, False, Bool) -- Set True when dynamic linker is initialised
87 data PersistentLinkerState
88 = PersistentLinkerState {
90 -- Current global mapping from Names to their true values
91 closure_env :: ClosureEnv,
93 -- The current global mapping from RdrNames of DataCons to
94 -- info table addresses.
95 -- When a new Unlinked is linked into the running image, or an existing
96 -- module in the image is replaced, the itbl_env must be updated
100 -- The currently loaded interpreted modules (home package)
101 bcos_loaded :: [Linkable],
103 -- And the currently-loaded compiled modules (home package)
104 objs_loaded :: [Linkable],
106 -- The currently-loaded packages; always object code
107 -- Held, as usual, in dependency order; though I am not sure if
108 -- that is really important
109 pkgs_loaded :: [PackageName]
112 emptyPLS :: PersistentLinkerState
113 emptyPLS = PersistentLinkerState { closure_env = emptyNameEnv,
114 itbl_env = emptyNameEnv,
115 pkgs_loaded = init_pkgs_loaded,
119 -- Packages that don't need loading, because the compiler
120 -- shares them with the interpreted program.
122 -- The linker's symbol table is populated with RTS symbols using an
123 -- explicit list. See rts/Linker.c for details.
124 init_pkgs_loaded = [ FSLIT("rts") ]
128 extendLinkEnv :: [(Name,HValue)] -> IO ()
129 -- Automatically discards shadowed bindings
130 extendLinkEnv new_bindings
131 = do pls <- readIORef v_PersistentLinkerState
132 let new_closure_env = extendClosureEnv (closure_env pls) new_bindings
133 new_pls = pls { closure_env = new_closure_env }
134 writeIORef v_PersistentLinkerState new_pls
136 -- filterNameMap removes from the environment all entries except
137 -- those for a given set of modules;
138 -- Note that this removes all *local* (i.e. non-isExternal) names too
139 -- (these are the temporary bindings from the command line).
140 -- Used to filter both the ClosureEnv and ItblEnv
142 filterNameMap :: [ModuleName] -> NameEnv (Name, a) -> NameEnv (Name, a)
143 filterNameMap mods env
144 = filterNameEnv keep_elt env
146 keep_elt (n,_) = isExternalName n
147 && (nameModuleName n `elem` mods)
152 showLinkerState :: IO ()
153 -- Display the persistent linker state
155 = do pls <- readIORef v_PersistentLinkerState
156 printDump (vcat [text "----- Linker state -----",
157 text "Pkgs:" <+> ppr (pkgs_loaded pls),
158 text "Objs:" <+> ppr (objs_loaded pls),
159 text "BCOs:" <+> ppr (bcos_loaded pls)])
165 %************************************************************************
167 \subsection{Initialisation}
169 %************************************************************************
171 We initialise the dynamic linker by
173 a) calling the C initialisation procedure
175 b) Loading any packages specified on the command line,
176 now held in v_ExplicitPackages
178 c) Loading any packages specified on the command line,
179 now held in the -l options in v_Opt_l
181 d) Loading any .o/.dll files specified on the command line,
182 now held in v_Ld_inputs
184 e) Loading any MacOS frameworks
187 initDynLinker :: IO ()
188 -- This function is idempotent; if called more than once, it does nothing
189 -- This is useful in Template Haskell, where we call it before trying to link
191 = do { done <- readIORef v_InitLinkerDone
192 ; if done then return ()
193 else do { writeIORef v_InitLinkerDone True
194 ; reallyInitDynLinker }
198 = do { dflags <- getDynFlags
200 -- Initialise the linker state
201 ; writeIORef v_PersistentLinkerState emptyPLS
203 -- (a) initialise the C dynamic linker
206 -- (b) Load packages from the command-line
207 ; expl <- readIORef v_ExplicitPackages
208 ; linkPackages dflags expl
210 -- (c) Link libraries from the command-line
211 ; opt_l <- getStaticOpts v_Opt_l
212 ; let minus_ls = [ lib | '-':'l':lib <- opt_l ]
214 -- (d) Link .o files from the command-line
215 ; lib_paths <- readIORef v_Library_paths
216 ; cmdline_ld_inputs <- readIORef v_Ld_inputs
218 ; classified_ld_inputs <- mapM classifyLdInput cmdline_ld_inputs
220 -- (e) Link any MacOS frameworks
221 #ifdef darwin_TARGET_OS
222 ; framework_paths <- readIORef v_Framework_paths
223 ; frameworks <- readIORef v_Cmdline_frameworks
225 ; let frameworks = []
226 ; let framework_paths = []
228 -- Finally do (c),(d),(e)
229 ; let cmdline_lib_specs = [ l | Just l <- classified_ld_inputs ]
231 ++ map Framework frameworks
232 ; if null cmdline_lib_specs then return ()
235 { mapM_ (preloadLib dflags lib_paths framework_paths) cmdline_lib_specs
236 ; maybePutStr dflags "final link ... "
239 ; if succeeded ok then maybePutStrLn dflags "done"
240 else throwDyn (InstallationError "linking extra libraries/objects failed")
243 classifyLdInput :: FilePath -> IO (Maybe LibrarySpec)
245 | isObjectFilename f = return (Just (Object f))
246 | isDynLibFilename f = return (Just (DLLPath f))
248 hPutStrLn stderr ("Warning: ignoring unrecognised input `" ++ f ++ "'")
251 preloadLib :: DynFlags -> [String] -> [String] -> LibrarySpec -> IO ()
252 preloadLib dflags lib_paths framework_paths lib_spec
253 = do maybePutStr dflags ("Loading object " ++ showLS lib_spec ++ " ... ")
256 -> do b <- preload_static lib_paths static_ish
257 maybePutStrLn dflags (if b then "done"
261 -> do maybe_errstr <- loadDynamic lib_paths dll_unadorned
263 Nothing -> maybePutStrLn dflags "done"
264 Just mm -> preloadFailed mm lib_paths lib_spec
267 -> do maybe_errstr <- loadDLL dll_path
269 Nothing -> maybePutStrLn dflags "done"
270 Just mm -> preloadFailed mm lib_paths lib_spec
272 #ifdef darwin_TARGET_OS
274 -> do maybe_errstr <- loadFramework framework_paths framework
276 Nothing -> maybePutStrLn dflags "done"
277 Just mm -> preloadFailed mm framework_paths lib_spec
280 preloadFailed :: String -> [String] -> LibrarySpec -> IO ()
281 preloadFailed sys_errmsg paths spec
282 = do maybePutStr dflags
283 ("failed.\nDynamic linker error message was:\n "
284 ++ sys_errmsg ++ "\nWhilst trying to load: "
285 ++ showLS spec ++ "\nDirectories to search are:\n"
286 ++ unlines (map (" "++) paths) )
289 -- Not interested in the paths in the static case.
290 preload_static paths name
291 = do b <- doesFileExist name
292 if not b then return False
293 else loadObj name >> return True
296 CmdLineError "user specified .o/.so/.DLL could not be loaded."
300 %************************************************************************
302 Link a byte-code expression
304 %************************************************************************
307 linkExpr :: HscEnv -> UnlinkedBCO -> IO HValue
309 -- Link a single expression, *including* first linking packages and
310 -- modules that this expression depends on.
312 -- Raises an IO exception if it can't find a compiled version of the
313 -- dependents to link.
315 linkExpr hsc_env root_ul_bco
317 -- Initialise the linker (if it's not been done already)
320 -- Find what packages and linkables are required
321 ; eps <- readIORef (hsc_EPS hsc_env)
322 ; (lnks, pkgs) <- getLinkDeps hpt (eps_PIT eps) needed_mods
324 -- Link the packages and modules required
325 ; linkPackages dflags pkgs
326 ; ok <- linkModules dflags lnks
331 -- Link the expression itself
332 pls <- readIORef v_PersistentLinkerState
333 ; let ie = itbl_env pls
336 -- Link the necessary packages and linkables
337 ; (_, (root_hval:_)) <- linkSomeBCOs False ie ce [root_ul_bco]
341 hpt = hsc_HPT hsc_env
342 dflags = hsc_dflags hsc_env
343 free_names = nameSetToList (bcoFreeNames root_ul_bco)
345 needed_mods :: [Module]
346 needed_mods = [ nameModule n | n <- free_names,
347 isExternalName n, -- Names from other modules
348 not (isWiredInName n) -- Exclude wired-in names
349 ] -- (see note below)
350 -- Exclude wired-in names because we may not have read
351 -- their interface files, so getLinkDeps will fail
352 -- All wired-in names are in the base package, which we link
353 -- by default, so we can safely ignore them here.
355 dieWith msg = throwDyn (ProgramError (showSDoc msg))
357 getLinkDeps :: HomePackageTable -> PackageIfaceTable
358 -> [Module] -- If you need these
359 -> IO ([Linkable], [PackageName]) -- ... then link these first
360 -- Fails with an IO exception if it can't find enough files
362 getLinkDeps hpt pit mods
363 -- Find all the packages and linkables that a set of modules depends on
364 = do { pls <- readIORef v_PersistentLinkerState ;
366 -- 1. Find the dependent home-pkg-modules/packages from each iface
367 (mods_s, pkgs_s) = unzip (map get_deps mods) ;
369 -- 2. Exclude ones already linked
370 -- Main reason: avoid findModule calls in get_linkable
371 mods_needed = nub (concat mods_s) `minusList` linked_mods ;
372 pkgs_needed = nub (concat pkgs_s) `minusList` pkgs_loaded pls ;
374 linked_mods = map linkableModName (objs_loaded pls ++ bcos_loaded pls)
377 -- 3. For each dependent module, find its linkable
378 -- This will either be in the HPT or (in the case of one-shot
379 -- compilation) we may need to use maybe_getFileLinkable
380 lnks_needed <- mapM get_linkable mods_needed ;
382 return (lnks_needed, pkgs_needed) }
384 get_deps :: Module -> ([ModuleName],[PackageName])
385 -- Get the things needed for the specified module
386 -- This is rather similar to the code in RnNames.importsFromImportDecl
388 | isHomeModule (mi_module iface)
389 = (moduleName mod : [m | (m,_) <- dep_mods deps], dep_pkgs deps)
391 = ([], mi_package iface : dep_pkgs deps)
393 iface = get_iface mod
396 get_iface mod = case lookupIface hpt pit mod of
398 Nothing -> pprPanic "getLinkDeps" (no_iface mod)
399 no_iface mod = ptext SLIT("No iface for") <+> ppr mod
400 -- This one is a GHC bug
402 no_obj mod = dieWith (ptext SLIT("No compiled code for") <+> ppr mod)
403 -- This one is a build-system bug
405 get_linkable mod_name -- A home-package module
406 | Just mod_info <- lookupModuleEnvByName hpt mod_name
407 = return (hm_linkable mod_info)
409 = -- It's not in the HPT because we are in one shot mode,
410 -- so use the Finder to get a ModLocation...
411 do { mb_stuff <- findModule mod_name ;
413 Left _ -> no_obj mod_name ;
414 Right (_, loc) -> do {
416 -- ...and then find the linkable for it
417 mb_lnk <- findLinkable mod_name loc ;
419 Nothing -> no_obj mod_name ;
420 Just lnk -> return lnk
425 %************************************************************************
428 The linkables may consist of a mixture of
429 byte-code modules and object modules
431 %************************************************************************
434 linkModules :: DynFlags -> [Linkable] -> IO SuccessFlag
435 linkModules dflags linkables
436 = block $ do -- don't want to be interrupted by ^C in here
438 let (objs, bcos) = partition isObjectLinkable
439 (concatMap partitionLinkable linkables)
441 -- Load objects first; they can't depend on BCOs
442 ok_flag <- dynLinkObjs dflags objs
444 if failed ok_flag then
451 -- HACK to support f-x-dynamic in the interpreter; no other purpose
452 partitionLinkable :: Linkable -> [Linkable]
454 = let li_uls = linkableUnlinked li
455 li_uls_obj = filter isObject li_uls
456 li_uls_bco = filter isInterpretable li_uls
458 case (li_uls_obj, li_uls_bco) of
459 (objs@(_:_), bcos@(_:_))
460 -> [li{linkableUnlinked=li_uls_obj}, li{linkableUnlinked=li_uls_bco}]
464 findModuleLinkable_maybe :: [Linkable] -> ModuleName -> Maybe Linkable
465 findModuleLinkable_maybe lis mod
466 = case [LM time nm us | LM time nm us <- lis, nm == mod] of
469 many -> pprPanic "findModuleLinkable" (ppr mod)
471 linkableInSet :: Linkable -> [Linkable] -> Bool
472 linkableInSet l objs_loaded =
473 case findModuleLinkable_maybe objs_loaded (linkableModName l) of
475 Just m -> linkableTime l == linkableTime m
479 %************************************************************************
481 \subsection{The object-code linker}
483 %************************************************************************
486 dynLinkObjs :: DynFlags -> [Linkable] -> IO SuccessFlag
487 -- Side-effects the PersistentLinkerState
489 dynLinkObjs dflags objs
490 = do pls <- readIORef v_PersistentLinkerState
492 -- Load the object files and link them
493 let (objs_loaded', new_objs) = rmDupLinkables (objs_loaded pls) objs
494 pls1 = pls { objs_loaded = objs_loaded' }
495 unlinkeds = concatMap linkableUnlinked new_objs
497 mapM loadObj (map nameOfObject unlinkeds)
499 -- Link the all together
502 -- If resolving failed, unload all our
503 -- object modules and carry on
504 if succeeded ok then do
505 writeIORef v_PersistentLinkerState pls1
508 pls2 <- unload_wkr dflags [] pls1
509 writeIORef v_PersistentLinkerState pls2
513 rmDupLinkables :: [Linkable] -- Already loaded
514 -> [Linkable] -- New linkables
515 -> ([Linkable], -- New loaded set (including new ones)
516 [Linkable]) -- New linkables (excluding dups)
517 rmDupLinkables already ls
520 go already extras [] = (already, extras)
521 go already extras (l:ls)
522 | linkableInSet l already = go already extras ls
523 | otherwise = go (l:already) (l:extras) ls
526 %************************************************************************
528 \subsection{The byte-code linker}
530 %************************************************************************
533 dynLinkBCOs :: [Linkable] -> IO ()
534 -- Side-effects the persistent linker state
536 = do pls <- readIORef v_PersistentLinkerState
538 let (bcos_loaded', new_bcos) = rmDupLinkables (bcos_loaded pls) bcos
539 pls1 = pls { bcos_loaded = bcos_loaded' }
540 unlinkeds :: [Unlinked]
541 unlinkeds = concatMap linkableUnlinked new_bcos
543 cbcs :: [CompiledByteCode]
544 cbcs = map byteCodeOfObject unlinkeds
547 ul_bcos = [b | ByteCode bs _ <- cbcs, b <- bs]
548 ies = [ie | ByteCode _ ie <- cbcs]
549 gce = closure_env pls
550 final_ie = foldr plusNameEnv (itbl_env pls) ies
552 (final_gce, linked_bcos) <- linkSomeBCOs True final_ie gce ul_bcos
553 -- What happens to these linked_bcos?
555 let pls2 = pls1 { closure_env = final_gce,
556 itbl_env = final_ie }
558 writeIORef v_PersistentLinkerState pls2
561 -- Link a bunch of BCOs and return them + updated closure env.
562 linkSomeBCOs :: Bool -- False <=> add _all_ BCOs to returned closure env
563 -- True <=> add only toplevel BCOs to closure env
567 -> IO (ClosureEnv, [HValue])
568 -- The returned HValues are associated 1-1 with
569 -- the incoming unlinked BCOs. Each gives the
570 -- value of the corresponding unlinked BCO
573 linkSomeBCOs toplevs_only ie ce_in ul_bcos
574 = do let nms = map unlinkedBCOName ul_bcos
576 ( \ hvs -> let ce_out = extendClosureEnv ce_in (zipLazy nms hvs)
577 in mapM (linkBCO ie ce_out) ul_bcos )
579 let ce_all_additions = zip nms hvals
580 ce_top_additions = filter (isExternalName.fst) ce_all_additions
581 ce_additions = if toplevs_only then ce_top_additions
582 else ce_all_additions
583 ce_out = -- make sure we're not inserting duplicate names into the
584 -- closure environment, which leads to trouble.
585 ASSERT (all (not . (`elemNameEnv` ce_in)) (map fst ce_additions))
586 extendClosureEnv ce_in ce_additions
587 return (ce_out, hvals)
592 %************************************************************************
594 Unload some object modules
596 %************************************************************************
599 -- ---------------------------------------------------------------------------
600 -- Unloading old objects ready for a new compilation sweep.
602 -- The compilation manager provides us with a list of linkables that it
603 -- considers "stable", i.e. won't be recompiled this time around. For
604 -- each of the modules current linked in memory,
606 -- * if the linkable is stable (and it's the same one - the
607 -- user may have recompiled the module on the side), we keep it,
609 -- * otherwise, we unload it.
611 -- * we also implicitly unload all temporary bindings at this point.
613 unload :: DynFlags -> [Linkable] -> IO ()
614 -- The 'linkables' are the ones to *keep*
616 unload dflags linkables
617 = block $ do -- block, so we're safe from Ctrl-C in here
619 pls <- readIORef v_PersistentLinkerState
620 new_pls <- unload_wkr dflags linkables pls
621 writeIORef v_PersistentLinkerState new_pls
623 let verb = verbosity dflags
624 when (verb >= 3) $ do
625 hPutStrLn stderr (showSDoc
626 (text "unload: retaining objs" <+> ppr (objs_loaded new_pls)))
627 hPutStrLn stderr (showSDoc
628 (text "unload: retaining bcos" <+> ppr (bcos_loaded new_pls)))
632 unload_wkr :: DynFlags
633 -> [Linkable] -- stable linkables
634 -> PersistentLinkerState
635 -> IO PersistentLinkerState
636 -- Does the core unload business
637 -- (the wrapper blocks exceptions and deals with the PLS get and put)
639 unload_wkr dflags linkables pls
640 = do let (objs_to_keep, bcos_to_keep) = partition isObjectLinkable linkables
642 objs_loaded' <- filterM (maybeUnload objs_to_keep) (objs_loaded pls)
643 bcos_loaded' <- filterM (maybeUnload bcos_to_keep) (bcos_loaded pls)
645 let bcos_retained = map linkableModName bcos_loaded'
646 itbl_env' = filterNameMap bcos_retained (itbl_env pls)
647 closure_env' = filterNameMap bcos_retained (closure_env pls)
648 new_pls = pls { itbl_env = itbl_env',
649 closure_env = closure_env',
650 bcos_loaded = bcos_loaded',
651 objs_loaded = objs_loaded' }
655 maybeUnload :: [Linkable] -> Linkable -> IO Bool
656 maybeUnload keep_linkables lnk
657 | linkableInSet lnk linkables = return True
659 = do mapM_ unloadObj [f | DotO f <- linkableUnlinked lnk]
660 -- The components of a BCO linkable may contain
661 -- dot-o files. Which is very confusing.
663 -- But the BCO parts can be unlinked just by
664 -- letting go of them (plus of course depopulating
665 -- the symbol table which is done in the main body)
670 %************************************************************************
674 %************************************************************************
679 = Object FilePath -- Full path name of a .o file, including trailing .o
680 -- For dynamic objects only, try to find the object
681 -- file in all the directories specified in
682 -- v_Library_paths before giving up.
684 | DLL String -- "Unadorned" name of a .DLL/.so
685 -- e.g. On unix "qt" denotes "libqt.so"
686 -- On WinDoze "burble" denotes "burble.DLL"
687 -- loadDLL is platform-specific and adds the lib/.so/.DLL
688 -- suffixes platform-dependently
690 | DLLPath FilePath -- Absolute or relative pathname to a dynamic library
691 -- (ends with .dll or .so).
693 | Framework String -- Only used for darwin, but does no harm
695 -- If this package is already part of the GHCi binary, we'll already
696 -- have the right DLLs for this package loaded, so don't try to
699 -- But on Win32 we must load them 'again'; doing so is a harmless no-op
700 -- as far as the loader is concerned, but it does initialise the list
701 -- of DLL handles that rts/Linker.c maintains, and that in turn is
702 -- used by lookupSymbol. So we must call addDLL for each library
703 -- just to get the DLL handle into the list.
705 # if defined(mingw32_TARGET_OS) || defined(darwin_TARGET_OS)
708 = [ "base", "haskell98", "haskell-src", "readline" ]
711 showLS (Object nm) = "(static) " ++ nm
712 showLS (DLL nm) = "(dynamic) " ++ nm
713 showLS (DLLPath nm) = "(dynamic) " ++ nm
714 showLS (Framework nm) = "(framework) " ++ nm
716 linkPackages :: DynFlags -> [PackageName] -> IO ()
717 -- Link exactly the specified packages, and their dependents
718 -- (unless of course they are already linked)
719 -- The dependents are linked automatically, and it doesn't matter
720 -- what order you specify the input packages.
722 -- NOTE: in fact, since each module tracks all the packages it depends on,
723 -- we don't really need to use the package-config dependencies.
724 -- However we do need the package-config stuff (to find aux libs etc),
725 -- and following them lets us load libraries in the right order, which
726 -- perhaps makes the error message a bit more localised if we get a link
727 -- failure. So the dependency walking code is still here.
729 linkPackages dflags new_pkgs
730 = do { pls <- readIORef v_PersistentLinkerState
731 ; pkg_map <- getPackageConfigMap
733 ; pkgs' <- link pkg_map (pkgs_loaded pls) new_pkgs
735 ; writeIORef v_PersistentLinkerState (pls { pkgs_loaded = pkgs' })
738 link :: PackageConfigMap -> [PackageName] -> [PackageName] -> IO [PackageName]
739 link pkg_map pkgs new_pkgs
740 = foldM (link_one pkg_map) pkgs new_pkgs
742 link_one pkg_map pkgs new_pkg
743 | new_pkg `elem` pkgs -- Already linked
746 | Just pkg_cfg <- lookupPkg pkg_map new_pkg
747 = do { -- Link dependents first
748 pkgs' <- link pkg_map pkgs (packageDependents pkg_cfg)
749 -- Now link the package itself
750 ; linkPackage dflags pkg_cfg
751 ; return (new_pkg : pkgs') }
754 = throwDyn (CmdLineError ("unknown package name: " ++ packageNameString new_pkg))
757 linkPackage :: DynFlags -> PackageConfig -> IO ()
758 linkPackage dflags pkg
760 let dirs = Packages.library_dirs pkg
761 let libs = Packages.hs_libraries pkg ++ extra_libraries pkg
762 ++ [ lib | '-':'l':lib <- extra_ld_opts pkg ]
763 classifieds <- mapM (locateOneObj dirs) libs
765 -- Complication: all the .so's must be loaded before any of the .o's.
766 let dlls = [ dll | DLL dll <- classifieds ]
767 objs = [ obj | Object obj <- classifieds ]
769 maybePutStr dflags ("Loading package " ++ Packages.name pkg ++ " ... ")
771 -- See comments with partOfGHCi
772 when (Packages.name pkg `notElem` partOfGHCi) $ do
774 mapM_ (load_dyn dirs) dlls
776 -- After loading all the DLLs, we can load the static objects.
779 maybePutStr dflags "linking ... "
781 if succeeded ok then maybePutStrLn dflags "done."
782 else panic ("can't load package `" ++ name pkg ++ "'")
784 load_dyn dirs dll = do r <- loadDynamic dirs dll
787 Just err -> throwDyn (CmdLineError ("can't load .so/.DLL for: "
788 ++ dll ++ " (" ++ err ++ ")" ))
789 #ifndef darwin_TARGET_OS
790 loadFrameworks pkg = return ()
792 loadFrameworks pkg = mapM_ load frameworks
794 fw_dirs = Packages.framework_dirs pkg
795 frameworks = Packages.extra_frameworks pkg
797 load fw = do r <- loadFramework fw_dirs fw
800 Just err -> throwDyn (CmdLineError ("can't load framework: "
801 ++ fw ++ " (" ++ err ++ ")" ))
804 -- Try to find an object file for a given library in the given paths.
805 -- If it isn't present, we assume it's a dynamic library.
806 locateOneObj :: [FilePath] -> String -> IO LibrarySpec
807 locateOneObj dirs lib
808 = do { mb_obj_path <- findFile mk_obj_path dirs
809 ; case mb_obj_path of
810 Just obj_path -> return (Object obj_path)
811 Nothing -> return (DLL lib) } -- We assume
813 mk_obj_path dir = dir ++ '/':lib ++ ".o"
816 -- ----------------------------------------------------------------------------
817 -- Loading a dyanmic library (dlopen()-ish on Unix, LoadLibrary-ish on Win32)
819 -- return Nothing == success, else Just error message from dlopen
820 loadDynamic paths rootname
821 = do { mb_dll <- findFile mk_dll_path paths
823 Just dll -> loadDLL dll
824 Nothing -> loadDLL (mkSOName rootname) }
825 -- Tried all our known library paths, so let
826 -- dlopen() search its own builtin paths now.
828 mk_dll_path dir = dir ++ '/':mkSOName rootname
830 #if defined(darwin_TARGET_OS)
831 mkSOName root = "lib" ++ root ++ ".dylib"
832 #elif defined(mingw32_TARGET_OS)
833 -- Win32 DLLs have no .dll extension here, because addDLL tries
834 -- both foo.dll and foo.drv
837 mkSOName root = "lib" ++ root ++ ".so"
840 -- Darwin / MacOS X only: load a framework
841 -- a framework is a dynamic library packaged inside a directory of the same
842 -- name. They are searched for in different paths than normal libraries.
843 #ifdef darwin_TARGET_OS
844 loadFramework extraPaths rootname
845 = do { mb_fwk <- findFile mk_fwk (extraPaths ++ defaultFrameworkPaths)
847 Just fwk_path -> loadDLL fwk_path
848 Nothing -> return (Just "not found") }
849 -- Tried all our known library paths, but dlopen()
850 -- has no built-in paths for frameworks: give up
852 mk_fwk dir = dir ++ '/' : rootname ++ ".framework/" ++ rootname
853 -- sorry for the hardcoded paths, I hope they won't change anytime soon:
854 defaultFrameworkPaths = ["/Library/Frameworks", "/System/Library/Frameworks"]
858 %************************************************************************
862 %************************************************************************
865 findFile :: (FilePath -> FilePath) -- Maps a directory path to a file path
866 -> [FilePath] -- Directories to look in
867 -> IO (Maybe FilePath) -- The first file path to match
868 findFile mk_file_path []
870 findFile mk_file_path (dir:dirs)
871 = do { let file_path = mk_file_path dir
872 ; b <- doesFileExist file_path
874 return (Just file_path)
876 findFile mk_file_path dirs }
880 maybePutStr dflags s | verbosity dflags > 0 = putStr s
881 | otherwise = return ()
883 maybePutStrLn dflags s | verbosity dflags > 0 = putStrLn s
884 | otherwise = return ()