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 #-}
18 module Linker ( HValue, initLinker, showLinkerState,
19 linkLibraries, linkExpr,
20 unload, extendLinkEnv,
25 #include "../includes/config.h"
26 #include "HsVersions.h"
28 import ObjLink ( loadDLL, loadObj, unloadObj, resolveObjs, initLinker )
29 import ByteCodeLink ( HValue, ClosureEnv, extendClosureEnv, linkBCO )
30 import ByteCodeItbls ( ItblEnv )
31 import ByteCodeAsm ( CompiledByteCode(..), bcoFreeNames, UnlinkedBCO(..))
34 import DriverState ( v_Library_paths, v_Opt_l,
35 v_Cmdline_frameworks, v_Framework_paths, getStaticOpts )
36 import Finder ( findModule, findLinkable )
38 import Name ( Name, nameModule, isExternalName )
40 import NameSet ( nameSetToList )
42 import FastString ( FastString(..), unpackFS )
43 import ListSetOps ( minusList )
44 import CmdLineOpts ( DynFlags(verbosity) )
45 import BasicTypes ( SuccessFlag(..), succeeded, failed )
47 import Panic ( GhcException(..) )
48 import Util ( zipLazy, global )
51 import Control.Monad ( when, filterM, foldM )
53 import Data.IORef ( IORef, readIORef, writeIORef )
54 import Data.List ( partition, nub )
56 import System.IO ( putStr, putStrLn, hPutStrLn, stderr, fixIO )
57 import System.Directory ( doesFileExist )
59 import Control.Exception ( block, throwDyn )
61 #if __GLASGOW_HASKELL__ >= 503
62 import GHC.IOBase ( IO(..) )
64 import PrelIOBase ( IO(..) )
69 %************************************************************************
73 %************************************************************************
75 The persistent linker state *must* match the actual state of the
76 C dynamic linker at all times, so we keep it in a private global variable.
79 The PersistentLinkerState maps Names to actual closures (for
80 interpreted code only), for use during linking.
83 GLOBAL_VAR(v_PersistentLinkerState, emptyPLS, PersistentLinkerState)
85 data PersistentLinkerState
86 = PersistentLinkerState {
88 -- Current global mapping from Names to their true values
89 closure_env :: ClosureEnv,
91 -- The current global mapping from RdrNames of DataCons to
92 -- info table addresses.
93 -- When a new Unlinked is linked into the running image, or an existing
94 -- module in the image is replaced, the itbl_env must be updated
98 -- The currently loaded interpreted modules (home package)
99 bcos_loaded :: [Linkable],
101 -- And the currently-loaded compiled modules (home package)
102 objs_loaded :: [Linkable],
104 -- The currently-loaded packages; always object code
105 -- Held, as usual, in dependency order; though I am not sure if
106 -- that is really important
107 pkgs_loaded :: [PackageName]
110 emptyPLS :: PersistentLinkerState
111 emptyPLS = PersistentLinkerState { closure_env = emptyNameEnv,
112 itbl_env = emptyNameEnv,
113 pkgs_loaded = init_pkgs_loaded,
117 -- Packages that don't need loading, because the compiler
118 -- shares them with the interpreted program.
119 init_pkgs_loaded = [ FSLIT("rts") ]
123 extendLinkEnv :: [(Name,HValue)] -> IO ()
124 -- Automatically discards shadowed bindings
125 extendLinkEnv new_bindings
126 = do pls <- readIORef v_PersistentLinkerState
127 let new_closure_env = extendClosureEnv (closure_env pls) new_bindings
128 new_pls = pls { closure_env = new_closure_env }
129 writeIORef v_PersistentLinkerState new_pls
131 -- filterNameMap removes from the environment all entries except
132 -- those for a given set of modules;
133 -- Note that this removes all *local* (i.e. non-isExternal) names too
134 -- (these are the temporary bindings from the command line).
135 -- Used to filter both the ClosureEnv and ItblEnv
137 filterNameMap :: [ModuleName] -> NameEnv (Name, a) -> NameEnv (Name, a)
138 filterNameMap mods env
139 = filterNameEnv keep_elt env
141 keep_elt (n,_) = isExternalName n
142 && (moduleName (nameModule n) `elem` mods)
147 showLinkerState :: IO ()
148 -- Display the persistent linker state
150 = do pls <- readIORef v_PersistentLinkerState
151 printDump (vcat [text "----- Linker state -----",
152 text "Pkgs:" <+> ppr (pkgs_loaded pls),
153 text "Objs:" <+> ppr (objs_loaded pls),
154 text "BCOs:" <+> ppr (bcos_loaded pls)])
159 %************************************************************************
161 Link a byte-code expression
163 %************************************************************************
166 linkExpr :: HscEnv -> PersistentCompilerState
167 -> UnlinkedBCO -> IO HValue
169 -- Link a single expression, *including* first linking packages and
170 -- modules that this expression depends on.
172 -- Raises an IO exception if it can't find a compiled version of the
173 -- dependents to link.
175 linkExpr hsc_env pcs root_ul_bco
177 -- Find what packages and linkables are required
178 (lnks, pkgs) <- getLinkDeps hpt pit needed_mods ;
180 -- Link the packages and modules required
181 linkPackages dflags pkgs
182 ; ok <- linkModules dflags lnks
187 -- Link the expression itself
188 pls <- readIORef v_PersistentLinkerState
189 ; let ie = itbl_env pls
192 -- Link the necessary packages and linkables
193 ; (_, (root_hval:_)) <- linkSomeBCOs False ie ce [root_ul_bco]
197 pit = eps_PIT (pcs_EPS pcs)
198 hpt = hsc_HPT hsc_env
199 dflags = hsc_dflags hsc_env
200 free_names = nameSetToList (bcoFreeNames root_ul_bco)
202 needed_mods :: [Module]
203 needed_mods = [ nameModule n | n <- free_names, isExternalName n ]
205 dieWith msg = throwDyn (UsageError (showSDoc msg))
207 getLinkDeps :: HomePackageTable -> PackageIfaceTable
208 -> [Module] -- If you need these
209 -> IO ([Linkable], [PackageName]) -- ... then link these first
210 -- Fails with an IO exception if it can't find enough files
212 getLinkDeps hpt pit mods
213 -- Find all the packages and linkables that a set of modules depends on
214 = do { pls <- readIORef v_PersistentLinkerState ;
216 -- 1. Find the dependent home-pkg-modules/packages from each iface
217 (mods_s, pkgs_s) = unzip (map get_deps mods) ;
219 -- 2. Exclude ones already linked
220 -- Main reason: avoid findModule calls in get_linkable
221 mods_needed = nub (concat mods_s) `minusList` linked_mods ;
222 pkgs_needed = nub (concat pkgs_s) `minusList` pkgs_loaded pls ;
224 linked_mods = map linkableModName (objs_loaded pls ++ bcos_loaded pls)
227 -- 3. For each dependent module, find its linkable
228 -- This will either be in the HPT or (in the case of one-shot
229 -- compilation) we may need to use maybe_getFileLinkable
230 lnks_needed <- mapM get_linkable mods_needed ;
232 return (lnks_needed, pkgs_needed) }
234 get_deps :: Module -> ([ModuleName],[PackageName])
235 -- Get the things needed for the specified module
236 -- This is rather similar to the code in RnNames.importsFromImportDecl
238 | isHomeModule (mi_module iface)
239 = (moduleName mod : [m | (m,_) <- dep_mods deps], dep_pkgs deps)
241 = ([], mi_package iface : dep_pkgs deps)
243 iface = get_iface mod
246 get_iface mod = case lookupIface hpt pit mod of
248 Nothing -> pprPanic "getLinkDeps" (no_iface mod)
249 no_iface mod = ptext SLIT("No iface for") <+> ppr mod
250 -- This one is a GHC bug
252 no_obj mod = dieWith (ptext SLIT("No compiled code for") <+> ppr mod)
253 -- This one is a build-system bug
255 get_linkable mod_name -- A home-package module
256 | Just mod_info <- lookupModuleEnvByName hpt mod_name
257 = return (hm_linkable mod_info)
259 = -- It's not in the HPT because we are in one shot mode,
260 -- so use the Finder to get a ModLocation...
261 do { mb_stuff <- findModule mod_name ;
263 Nothing -> no_obj mod_name ;
264 Just (_, loc) -> do {
266 -- ...and then find the linkable for it
267 mb_lnk <- findLinkable mod_name loc ;
269 Nothing -> no_obj mod_name ;
270 Just lnk -> return lnk
275 %************************************************************************
278 The linkables may consist of a mixture of
279 byte-code modules and object modules
281 %************************************************************************
284 linkModules :: DynFlags -> [Linkable] -> IO SuccessFlag
285 linkModules dflags linkables
286 = block $ do -- don't want to be interrupted by ^C in here
288 let (objs, bcos) = partition isObjectLinkable
289 (concatMap partitionLinkable linkables)
291 -- Load objects first; they can't depend on BCOs
292 ok_flag <- dynLinkObjs dflags objs
294 if failed ok_flag then
301 -- HACK to support f-x-dynamic in the interpreter; no other purpose
302 partitionLinkable :: Linkable -> [Linkable]
304 = let li_uls = linkableUnlinked li
305 li_uls_obj = filter isObject li_uls
306 li_uls_bco = filter isInterpretable li_uls
308 case (li_uls_obj, li_uls_bco) of
309 (objs@(_:_), bcos@(_:_))
310 -> [li{linkableUnlinked=li_uls_obj}, li{linkableUnlinked=li_uls_bco}]
314 findModuleLinkable_maybe :: [Linkable] -> ModuleName -> Maybe Linkable
315 findModuleLinkable_maybe lis mod
316 = case [LM time nm us | LM time nm us <- lis, nm == mod] of
319 many -> pprPanic "findModuleLinkable" (ppr mod)
321 filterModuleLinkables :: (ModuleName -> Bool) -> [Linkable] -> [Linkable]
322 filterModuleLinkables p ls = filter (p . linkableModName) ls
324 linkableInSet :: Linkable -> [Linkable] -> Bool
325 linkableInSet l objs_loaded =
326 case findModuleLinkable_maybe objs_loaded (linkableModName l) of
328 Just m -> linkableTime l == linkableTime m
332 %************************************************************************
334 \subsection{The object-code linker}
336 %************************************************************************
339 dynLinkObjs :: DynFlags -> [Linkable] -> IO SuccessFlag
340 -- Side-effects the PersistentLinkerState
342 dynLinkObjs dflags objs
343 = do pls <- readIORef v_PersistentLinkerState
345 -- Load the object files and link them
346 let (objs_loaded', new_objs) = rmDupLinkables (objs_loaded pls) objs
347 pls1 = pls { objs_loaded = objs_loaded' }
348 unlinkeds = concatMap linkableUnlinked new_objs
350 mapM loadObj (map nameOfObject unlinkeds)
352 -- Link the all together
355 -- If resolving failed, unload all our
356 -- object modules and carry on
357 if succeeded ok then do
358 writeIORef v_PersistentLinkerState pls1
361 pls2 <- unload_wkr dflags [] pls1
362 writeIORef v_PersistentLinkerState pls2
366 rmDupLinkables :: [Linkable] -- Already loaded
367 -> [Linkable] -- New linkables
368 -> ([Linkable], -- New loaded set (including new ones)
369 [Linkable]) -- New linkables (excluding dups)
370 rmDupLinkables already ls
373 go already extras [] = (already, extras)
374 go already extras (l:ls)
375 | linkableInSet l already = go already extras ls
376 | otherwise = go (l:already) (l:extras) ls
381 linkLibraries :: DynFlags
382 -> [String] -- foo.o files specified on command line
384 -- Used just at initialisation time to link in libraries
385 -- specified on the command line.
386 linkLibraries dflags objs
387 = do { lib_paths <- readIORef v_Library_paths
388 ; opt_l <- getStaticOpts v_Opt_l
389 ; let minus_ls = [ lib | '-':'l':lib <- opt_l ]
390 #ifdef darwin_TARGET_OS
391 ; framework_paths <- readIORef v_Framework_paths
392 ; frameworks <- readIORef v_Cmdline_frameworks
394 ; let cmdline_lib_specs = map Object objs ++ map DLL minus_ls
395 #ifdef darwin_TARGET_OS
396 ++ map Framework frameworks
398 ; if (null cmdline_lib_specs) then return ()
402 #ifdef darwin_TARGET_OS
403 ; mapM_ (preloadLib dflags lib_paths framework_paths) cmdline_lib_specs
405 ; mapM_ (preloadLib dflags lib_paths) cmdline_lib_specs
407 ; maybePutStr dflags "final link ... "
409 ; if succeeded ok then maybePutStrLn dflags "done."
410 else throwDyn (InstallationError "linking extra libraries/objects failed")
413 #ifdef darwin_TARGET_OS
414 preloadLib :: DynFlags -> [String] -> [String] -> LibrarySpec -> IO ()
415 preloadLib dflags lib_paths framework_paths lib_spec
417 preloadLib :: DynFlags -> [String] -> LibrarySpec -> IO ()
418 preloadLib dflags lib_paths lib_spec
420 = do maybePutStr dflags ("Loading object " ++ showLS lib_spec ++ " ... ")
423 -> do b <- preload_static lib_paths static_ish
424 maybePutStrLn dflags (if b then "done."
427 -> do maybe_errstr <- loadDynamic lib_paths dll_unadorned
430 Just mm -> preloadFailed mm lib_paths lib_spec
431 maybePutStrLn dflags "done"
432 #ifdef darwin_TARGET_OS
434 -> do maybe_errstr <- loadFramework framework_paths framework
437 Just mm -> preloadFailed mm framework_paths lib_spec
438 maybePutStrLn dflags "done"
440 preloadFailed :: String -> [String] -> LibrarySpec -> IO ()
441 preloadFailed sys_errmsg paths spec
442 = do maybePutStr dflags
443 ("failed.\nDynamic linker error message was:\n "
444 ++ sys_errmsg ++ "\nWhilst trying to load: "
445 ++ showLS spec ++ "\nDirectories to search are:\n"
446 ++ unlines (map (" "++) paths) )
449 -- not interested in the paths in the static case.
450 preload_static paths name
451 = do b <- doesFileExist name
452 if not b then return False
453 else loadObj name >> return True
456 = (throwDyn . CmdLineError)
457 "user specified .o/.so/.DLL could not be loaded."
461 %************************************************************************
463 \subsection{The byte-code linker}
465 %************************************************************************
468 dynLinkBCOs :: [Linkable] -> IO ()
469 -- Side-effects the persistent linker state
471 = do pls <- readIORef v_PersistentLinkerState
473 let (bcos_loaded', new_bcos) = rmDupLinkables (bcos_loaded pls) bcos
474 pls1 = pls { bcos_loaded = bcos_loaded' }
475 unlinkeds :: [Unlinked]
476 unlinkeds = concatMap linkableUnlinked new_bcos
478 cbcs :: [CompiledByteCode]
479 cbcs = map byteCodeOfObject unlinkeds
482 ul_bcos = [b | ByteCode bs _ <- cbcs, b <- bs]
483 ies = [ie | ByteCode _ ie <- cbcs]
484 gce = closure_env pls
485 final_ie = foldr plusNameEnv (itbl_env pls) ies
487 (final_gce, linked_bcos) <- linkSomeBCOs True final_ie gce ul_bcos
488 -- What happens to these linked_bcos?
490 let pls2 = pls1 { closure_env = final_gce,
491 itbl_env = final_ie }
493 writeIORef v_PersistentLinkerState pls2
496 -- Link a bunch of BCOs and return them + updated closure env.
497 linkSomeBCOs :: Bool -- False <=> add _all_ BCOs to returned closure env
498 -- True <=> add only toplevel BCOs to closure env
502 -> IO (ClosureEnv, [HValue])
503 -- The returned HValues are associated 1-1 with
504 -- the incoming unlinked BCOs. Each gives the
505 -- value of the corresponding unlinked BCO
508 linkSomeBCOs toplevs_only ie ce_in ul_bcos
509 = do let nms = map unlinkedBCOName ul_bcos
511 ( \ hvs -> let ce_out = extendClosureEnv ce_in (zipLazy nms hvs)
512 in mapM (linkBCO ie ce_out) ul_bcos )
514 let ce_all_additions = zip nms hvals
515 ce_top_additions = filter (isExternalName.fst) ce_all_additions
516 ce_additions = if toplevs_only then ce_top_additions
517 else ce_all_additions
518 ce_out = -- make sure we're not inserting duplicate names into the
519 -- closure environment, which leads to trouble.
520 ASSERT (all (not . (`elemNameEnv` ce_in)) (map fst ce_additions))
521 extendClosureEnv ce_in ce_additions
522 return (ce_out, hvals)
527 %************************************************************************
529 Unload some object modules
531 %************************************************************************
534 -- ---------------------------------------------------------------------------
535 -- Unloading old objects ready for a new compilation sweep.
537 -- The compilation manager provides us with a list of linkables that it
538 -- considers "stable", i.e. won't be recompiled this time around. For
539 -- each of the modules current linked in memory,
541 -- * if the linkable is stable (and it's the same one - the
542 -- user may have recompiled the module on the side), we keep it,
544 -- * otherwise, we unload it.
546 -- * we also implicitly unload all temporary bindings at this point.
548 unload :: DynFlags -> [Linkable] -> IO ()
549 -- The 'linkables' are the ones to *keep*
551 unload dflags linkables
552 = block $ do -- block, so we're safe from Ctrl-C in here
554 pls <- readIORef v_PersistentLinkerState
555 new_pls <- unload_wkr dflags linkables pls
556 writeIORef v_PersistentLinkerState new_pls
558 let verb = verbosity dflags
559 when (verb >= 3) $ do
560 hPutStrLn stderr (showSDoc
561 (text "unload: retaining objs" <+> ppr (objs_loaded new_pls)))
562 hPutStrLn stderr (showSDoc
563 (text "unload: retaining bcos" <+> ppr (bcos_loaded new_pls)))
567 unload_wkr :: DynFlags
568 -> [Linkable] -- stable linkables
569 -> PersistentLinkerState
570 -> IO PersistentLinkerState
571 -- Does the core unload business
572 -- (the wrapper blocks exceptions and deals with the PLS get and put)
574 unload_wkr dflags linkables pls
575 = do let (objs_to_keep, bcos_to_keep) = partition isObjectLinkable linkables
577 objs_loaded' <- filterM (maybeUnload objs_to_keep) (objs_loaded pls)
578 bcos_loaded' <- filterM (maybeUnload bcos_to_keep) (bcos_loaded pls)
580 let objs_retained = map linkableModName objs_loaded'
581 bcos_retained = map linkableModName bcos_loaded'
582 itbl_env' = filterNameMap bcos_retained (itbl_env pls)
583 closure_env' = filterNameMap bcos_retained (closure_env pls)
584 new_pls = pls { itbl_env = itbl_env',
585 closure_env = closure_env',
586 bcos_loaded = bcos_loaded',
587 objs_loaded = objs_loaded' }
591 maybeUnload :: [Linkable] -> Linkable -> IO Bool
592 maybeUnload keep_linkables lnk
593 | linkableInSet lnk linkables = return True
595 = do mapM_ unloadObj [f | DotO f <- linkableUnlinked lnk]
596 -- The components of a BCO linkable may contain
597 -- dot-o files. Which is very confusing.
599 -- But the BCO parts can be unlinked just by
600 -- letting go of them (plus of course depopulating
601 -- the symbol table which is done in the main body)
606 %************************************************************************
610 %************************************************************************
615 = Object FilePath -- Full path name of a .o file, including trailing .o
616 -- For dynamic objects only, try to find the object
617 -- file in all the directories specified in
618 -- v_Library_paths before giving up.
620 | DLL String -- "Unadorned" name of a .DLL/.so
621 -- e.g. On unix "qt" denotes "libqt.so"
622 -- On WinDoze "burble" denotes "burble.DLL"
623 -- loadDLL is platform-specific and adds the lib/.so/.DLL
624 -- suffixes platform-dependently
625 #ifdef darwin_TARGET_OS
629 -- If this package is already part of the GHCi binary, we'll already
630 -- have the right DLLs for this package loaded, so don't try to
633 -- But on Win32 we must load them 'again'; doing so is a harmless no-op
634 -- as far as the loader is concerned, but it does initialise the list
635 -- of DLL handles that rts/Linker.c maintains, and that in turn is
636 -- used by lookupSymbol. So we must call addDLL for each library
637 -- just to get the DLL handle into the list.
639 # if defined(mingw32_TARGET_OS) || defined(darwin_TARGET_OS)
642 = [ "base", "haskell98", "haskell-src", "readline" ]
645 showLS (Object nm) = "(static) " ++ nm
646 showLS (DLL nm) = "(dynamic) " ++ nm
647 #ifdef darwin_TARGET_OS
648 showLS (Framework nm) = "(framework) " ++ nm
651 linkPackages :: DynFlags -> [PackageName] -> IO ()
652 -- Link exactly the specified packages, and their dependents
653 -- (unless of course they are already linked)
654 -- The dependents are linked automatically, and it doesn't matter
655 -- what order you specify the input packages.
657 -- NOTE: in fact, since each module tracks all the packages it depends on,
658 -- we don't really need to use the package-config dependencies.
659 -- However we do need the package-config stuff (to find aux libs etc),
660 -- and following them lets us load libraries in the right order, which
661 -- perhaps makes the error message a bit more localised if we get a link
662 -- failure. So the dependency walking code is still here.
664 linkPackages dflags new_pkgs
665 = do { pls <- readIORef v_PersistentLinkerState
666 ; pkg_map <- getPackageConfigMap
668 ; pkgs' <- link pkg_map (pkgs_loaded pls) new_pkgs
670 ; writeIORef v_PersistentLinkerState (pls { pkgs_loaded = pkgs' })
673 link :: PackageConfigMap -> [PackageName] -> [PackageName] -> IO [PackageName]
674 link pkg_map pkgs new_pkgs
675 = foldM (link_one pkg_map) pkgs new_pkgs
677 link_one pkg_map pkgs new_pkg
678 | new_pkg `elem` pkgs -- Already linked
681 | Just pkg_cfg <- lookupPkg pkg_map new_pkg
682 = do { -- Link dependents first
683 pkgs' <- link pkg_map pkgs (packageDependents pkg_cfg)
684 -- Now link the package itself
685 ; linkPackage dflags pkg_cfg
686 ; return (new_pkg : pkgs') }
689 = throwDyn (CmdLineError ("unknown package name: " ++ packageNameString new_pkg))
692 linkPackage :: DynFlags -> PackageConfig -> IO ()
693 linkPackage dflags pkg
695 let dirs = Packages.library_dirs pkg
696 let libs = Packages.hs_libraries pkg ++ extra_libraries pkg
697 ++ [ lib | '-':'l':lib <- extra_ld_opts pkg ]
698 classifieds <- mapM (locateOneObj dirs) libs
699 #ifdef darwin_TARGET_OS
700 let fwDirs = Packages.framework_dirs pkg
701 let frameworks= Packages.extra_frameworks pkg
704 -- Complication: all the .so's must be loaded before any of the .o's.
705 let dlls = [ dll | DLL dll <- classifieds ]
706 objs = [ obj | Object obj <- classifieds ]
708 maybePutStr dflags ("Loading package " ++ Packages.name pkg ++ " ... ")
710 -- See comments with partOfGHCi
711 when (Packages.name pkg `notElem` partOfGHCi) $ do
712 #ifdef darwin_TARGET_OS
713 loadFrameworks fwDirs frameworks
715 loadDynamics dirs dlls
717 -- After loading all the DLLs, we can load the static objects.
720 maybePutStr dflags "linking ... "
722 if succeeded ok then maybePutStrLn dflags "done."
723 else panic ("can't load package `" ++ name pkg ++ "'")
725 loadDynamics dirs [] = return ()
726 loadDynamics dirs (dll:dlls) = do
727 r <- loadDynamic dirs dll
729 Nothing -> loadDynamics dirs dlls
730 Just err -> throwDyn (CmdLineError ("can't load .so/.DLL for: "
731 ++ dll ++ " (" ++ err ++ ")" ))
732 #ifdef darwin_TARGET_OS
733 loadFrameworks dirs [] = return ()
734 loadFrameworks dirs (fw:fws) = do
735 r <- loadFramework dirs fw
737 Nothing -> loadFrameworks dirs fws
738 Just err -> throwDyn (CmdLineError ("can't load framework: "
739 ++ fw ++ " (" ++ err ++ ")" ))
742 -- Try to find an object file for a given library in the given paths.
743 -- If it isn't present, we assume it's a dynamic library.
744 locateOneObj :: [FilePath] -> String -> IO LibrarySpec
745 locateOneObj dirs lib
746 = do { mb_obj_path <- findFile mk_obj_path dirs
747 ; case mb_obj_path of
748 Just obj_path -> return (Object obj_path)
749 Nothing -> return (DLL lib) } -- we assume
751 mk_obj_path dir = dir ++ '/':lib ++ ".o"
754 -- ----------------------------------------------------------------------------
755 -- Loading a dyanmic library (dlopen()-ish on Unix, LoadLibrary-ish on Win32)
757 -- return Nothing == success, else Just error message from dlopen
758 loadDynamic paths rootname
759 = do { mb_dll <- findFile mk_dll_path paths
761 Just dll -> loadDLL dll
762 Nothing -> loadDLL (mkSOName rootname) }
763 -- Tried all our known library paths, so let
764 -- dlopen() search its own builtin paths now.
766 mk_dll_path dir = dir ++ '/':mkSOName rootname
768 #if defined(darwin_TARGET_OS)
769 mkSOName root = "lib" ++ root ++ ".dylib"
770 #elif defined(mingw32_TARGET_OS)
771 -- Win32 DLLs have no .dll extension here, because addDLL tries
772 -- both foo.dll and foo.drv
775 mkSOName root = "lib" ++ root ++ ".so"
778 -- Darwin / MacOS X only: load a framework
779 -- a framework is a dynamic library packaged inside a directory of the same
780 -- name. They are searched for in different paths than normal libraries.
781 #ifdef darwin_TARGET_OS
782 loadFramework extraPaths rootname
783 = do { mb_fwk <- findFile mk_fwk (extraPaths ++ defaultFrameworkPaths)
785 Just fwk_path -> loadDLL fwk_path
786 Nothing -> return (Just "not found") }
787 -- Tried all our known library paths, but dlopen()
788 -- has no built-in paths for frameworks: give up
790 mk_fwk dir = dir ++ '/' : rootname ++ ".framework/" ++ rootname
791 -- sorry for the hardcoded paths, I hope they won't change anytime soon:
792 defaultFrameworkPaths = ["/Library/Frameworks", "/System/Library/Frameworks"]
796 %************************************************************************
800 %************************************************************************
803 findFile :: (FilePath -> FilePath) -- Maps a directory path to a file path
804 -> [FilePath] -- Directories to look in
805 -> IO (Maybe FilePath) -- The first file path to match
806 findFile mk_file_path []
808 findFile mk_file_path (dir:dirs)
809 = do { let file_path = mk_file_path dir
810 ; b <- doesFileExist file_path
812 return (Just file_path)
814 findFile mk_file_path dirs }
818 maybePutStr dflags s | verbosity dflags > 0 = putStr s
819 | otherwise = return ()
821 maybePutStrLn dflags s | verbosity dflags > 0 = putStrLn s
822 | otherwise = return ()