ghc-8.4.1: ghci/Linker.hs
{-# LANGUAGE CPP, NondecreasingIndentation, TupleSections, RecordWildCards #-}
{-# OPTIONS_GHC -fno-cse #-}
-- -fno-cse is needed for GLOBAL_VAR's to behave properly
--
-- (c) The University of Glasgow 2002-2006
--
-- | The dynamic linker for GHCi.
--
-- This module deals with the top-level issues of dynamic linking,
-- calling the object-code linker and the byte-code linker where
-- necessary.
module Linker ( getHValue, showLinkerState,
linkExpr, linkDecls, unload, withExtendedLinkEnv,
extendLinkEnv, deleteFromLinkEnv,
extendLoadedPkgs,
linkPackages,initDynLinker,linkModule,
linkCmdLineLibs
) where
#include "HsVersions.h"
import GhcPrelude
import GHCi
import GHCi.RemoteTypes
import LoadIface
import ByteCodeLink
import ByteCodeAsm
import ByteCodeTypes
import TcRnMonad
import Packages
import DriverPhases
import Finder
import HscTypes
import Name
import NameEnv
import Module
import ListSetOps
import DynFlags
import BasicTypes
import Outputable
import Panic
import Util
import ErrUtils
import SrcLoc
import qualified Maybes
import UniqDSet
import FastString
import Platform
import SysTools
import FileCleanup
-- Standard libraries
import Control.Monad
import Data.Char (isSpace)
import Data.IORef
import Data.List
import Data.Maybe
import Control.Concurrent.MVar
import System.FilePath
import System.Directory
import System.IO.Unsafe
#if defined(mingw32_HOST_OS)
import System.Win32.Info (getSystemDirectory)
#endif
import Exception
import Foreign (Ptr) -- needed for 2nd stage
{- **********************************************************************
The Linker's state
********************************************************************* -}
{-
The persistent linker state *must* match the actual state of the
C dynamic linker at all times, so we keep it in a private global variable.
The global IORef used for PersistentLinkerState actually contains another MVar.
The reason for this is that we want to allow another loaded copy of the GHC
library to side-effect the PLS and for those changes to be reflected here.
The PersistentLinkerState maps Names to actual closures (for
interpreted code only), for use during linking.
-}
#if STAGE < 2
GLOBAL_VAR_M(v_PersistentLinkerState, newMVar (panic "Dynamic linker not initialised"), MVar PersistentLinkerState)
GLOBAL_VAR(v_InitLinkerDone, False, Bool) -- Set True when dynamic linker is initialised
#else
SHARED_GLOBAL_VAR_M( v_PersistentLinkerState
, getOrSetLibHSghcPersistentLinkerState
, "getOrSetLibHSghcPersistentLinkerState"
, newMVar (panic "Dynamic linker not initialised")
, MVar PersistentLinkerState)
-- Set True when dynamic linker is initialised
SHARED_GLOBAL_VAR( v_InitLinkerDone
, getOrSetLibHSghcInitLinkerDone
, "getOrSetLibHSghcInitLinkerDone"
, False
, Bool)
#endif
modifyPLS_ :: (PersistentLinkerState -> IO PersistentLinkerState) -> IO ()
modifyPLS_ f = readIORef v_PersistentLinkerState >>= flip modifyMVar_ f
modifyPLS :: (PersistentLinkerState -> IO (PersistentLinkerState, a)) -> IO a
modifyPLS f = readIORef v_PersistentLinkerState >>= flip modifyMVar f
data PersistentLinkerState
= PersistentLinkerState {
-- Current global mapping from Names to their true values
closure_env :: ClosureEnv,
-- The current global mapping from RdrNames of DataCons to
-- info table addresses.
-- When a new Unlinked is linked into the running image, or an existing
-- module in the image is replaced, the itbl_env must be updated
-- appropriately.
itbl_env :: !ItblEnv,
-- The currently loaded interpreted modules (home package)
bcos_loaded :: ![Linkable],
-- And the currently-loaded compiled modules (home package)
objs_loaded :: ![Linkable],
-- The currently-loaded packages; always object code
-- Held, as usual, in dependency order; though I am not sure if
-- that is really important
pkgs_loaded :: ![LinkerUnitId],
-- we need to remember the name of previous temporary DLL/.so
-- libraries so we can link them (see #10322)
temp_sos :: ![(FilePath, String)] }
emptyPLS :: DynFlags -> PersistentLinkerState
emptyPLS _ = PersistentLinkerState {
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 = map toInstalledUnitId [rtsUnitId]
extendLoadedPkgs :: [InstalledUnitId] -> IO ()
extendLoadedPkgs pkgs =
modifyPLS_ $ \s ->
return s{ pkgs_loaded = pkgs ++ pkgs_loaded s }
extendLinkEnv :: [(Name,ForeignHValue)] -> IO ()
extendLinkEnv new_bindings =
modifyPLS_ $ \pls -> do
let ce = closure_env pls
let new_ce = extendClosureEnv ce new_bindings
return pls{ closure_env = new_ce }
deleteFromLinkEnv :: [Name] -> IO ()
deleteFromLinkEnv to_remove =
modifyPLS_ $ \pls -> do
let ce = closure_env pls
let new_ce = delListFromNameEnv ce to_remove
return pls{ closure_env = new_ce }
-- | Get the 'HValue' associated with the given name.
--
-- May cause loading the module that contains the name.
--
-- Throws a 'ProgramError' if loading fails or the name cannot be found.
getHValue :: HscEnv -> Name -> IO ForeignHValue
getHValue hsc_env name = do
initDynLinker hsc_env
pls <- modifyPLS $ \pls -> do
if (isExternalName name) then do
(pls', ok) <- linkDependencies hsc_env pls noSrcSpan
[nameModule name]
if (failed ok) then throwGhcExceptionIO (ProgramError "")
else return (pls', pls')
else
return (pls, pls)
case lookupNameEnv (closure_env pls) name of
Just (_,aa) -> return aa
Nothing
-> ASSERT2(isExternalName name, ppr name)
do let sym_to_find = nameToCLabel name "closure"
m <- lookupClosure hsc_env (unpackFS sym_to_find)
case m of
Just hvref -> mkFinalizedHValue hsc_env hvref
Nothing -> linkFail "ByteCodeLink.lookupCE"
(unpackFS sym_to_find)
linkDependencies :: HscEnv -> PersistentLinkerState
-> SrcSpan -> [Module]
-> IO (PersistentLinkerState, SuccessFlag)
linkDependencies hsc_env pls span needed_mods = do
-- initDynLinker (hsc_dflags hsc_env)
let hpt = hsc_HPT hsc_env
dflags = hsc_dflags 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 dflags 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 <- linkPackages' hsc_env pkgs pls
linkModules hsc_env pls1 lnks
-- | Temporarily extend the linker state.
withExtendedLinkEnv :: (ExceptionMonad m) =>
[(Name,ForeignHValue)] -> m a -> m a
withExtendedLinkEnv new_env action
= gbracket (liftIO $ extendLinkEnv 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 $ do
modifyPLS_ $ \pls ->
let cur = closure_env pls
new = delListFromNameEnv cur (map fst new_env)
in return pls{ closure_env = new }
-- | Display the persistent linker state.
showLinkerState :: DynFlags -> IO ()
showLinkerState dflags
= do pls <- readIORef v_PersistentLinkerState >>= readMVar
putLogMsg dflags NoReason SevDump noSrcSpan
(defaultDumpStyle dflags)
(vcat [text "----- Linker 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.
--
initDynLinker :: HscEnv -> IO ()
initDynLinker hsc_env =
modifyPLS_ $ \pls0 -> do
done <- readIORef v_InitLinkerDone
if done then return pls0
else do writeIORef v_InitLinkerDone True
reallyInitDynLinker hsc_env
reallyInitDynLinker :: HscEnv -> IO PersistentLinkerState
reallyInitDynLinker hsc_env = do
-- Initialise the linker state
let dflags = hsc_dflags hsc_env
pls0 = emptyPLS dflags
-- (a) initialise the C dynamic linker
initObjLinker hsc_env
-- (b) Load packages from the command-line (Note [preload packages])
pls <- linkPackages' hsc_env (preloadPackages (pkgState dflags)) pls0
-- steps (c), (d) and (e)
linkCmdLineLibs' hsc_env pls
linkCmdLineLibs :: HscEnv -> IO ()
linkCmdLineLibs hsc_env = do
initDynLinker hsc_env
modifyPLS_ $ \pls -> do
linkCmdLineLibs' hsc_env pls
linkCmdLineLibs' :: HscEnv -> PersistentLinkerState -> IO PersistentLinkerState
linkCmdLineLibs' hsc_env pls =
do
let dflags@(DynFlags { ldInputs = cmdline_ld_inputs
, libraryPaths = lib_paths_base})
= hsc_dflags 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 Trac #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 dflags os
libspecs
<- mapM (locateLib hsc_env False lib_paths_base gcc_paths) minus_ls
-- (d) Link .o files from the command-line
classified_ld_inputs <- mapM (classifyLdInput 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 (fst $ sPgm_c $ settings 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
pathCache <- mapM (addLibrarySearchPath hsc_env) all_paths
pls1 <- foldM (preloadLib hsc_env lib_paths framework_paths) pls
cmdline_lib_specs
maybePutStr 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 dflags "done"
else throwGhcExceptionIO (ProgramError "linking extra libraries/objects failed")
return pls1
{- 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 :: DynFlags -> FilePath -> IO (Maybe LibrarySpec)
classifyLdInput dflags f
| isObjectFilename platform f = return (Just (Object f))
| isDynLibFilename platform f = return (Just (DLLPath f))
| otherwise = do
putLogMsg dflags NoReason SevInfo noSrcSpan
(defaultUserStyle dflags)
(text ("Warning: ignoring unrecognised input `" ++ f ++ "'"))
return Nothing
where platform = targetPlatform dflags
preloadLib
:: HscEnv -> [String] -> [String] -> PersistentLinkerState
-> LibrarySpec -> IO PersistentLinkerState
preloadLib hsc_env lib_paths framework_paths pls lib_spec = do
maybePutStr dflags ("Loading object " ++ showLS lib_spec ++ " ... ")
case lib_spec of
Object static_ish -> do
(b, pls1) <- preload_static lib_paths static_ish
maybePutStrLn dflags (if b then "done" else "not found")
return pls1
Archive static_ish -> do
b <- preload_static_archive lib_paths static_ish
maybePutStrLn dflags (if b then "done" else "not found")
return pls
DLL dll_unadorned -> do
maybe_errstr <- loadDLL hsc_env (mkSOName platform dll_unadorned)
case maybe_errstr of
Nothing -> maybePutStrLn 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 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 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 dflags "done"
Just mm -> preloadFailed mm framework_paths lib_spec
return pls
else panic "preloadLib Framework"
where
dflags = hsc_dflags hsc_env
platform = targetPlatform dflags
preloadFailed :: String -> [String] -> LibrarySpec -> IO ()
preloadFailed sys_errmsg paths spec
= do maybePutStr 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_static _paths name
= do b <- doesFileExist name
if not b then return (False, pls)
else if dynamicGhc
then do pls1 <- dynLoadObjs hsc_env pls [name]
return (True, pls1)
else do loadObj hsc_env name
return (True, pls)
preload_static_archive _paths name
= do b <- doesFileExist name
if not b then return False
else do if dynamicGhc
then panic "Loading archives not supported"
else loadArchive hsc_env name
return True
{- **********************************************************************
Link a byte-code expression
********************************************************************* -}
-- | Link a single expression, /including/ first linking 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 link.
--
linkExpr :: HscEnv -> SrcSpan -> UnlinkedBCO -> IO ForeignHValue
linkExpr hsc_env span root_ul_bco
= do {
-- Initialise the linker (if it's not been done already)
; initDynLinker hsc_env
-- Take lock for the actual work.
; modifyPLS $ \pls0 -> do {
-- Link the packages and modules required
; (pls, ok) <- linkDependencies hsc_env pls0 span needed_mods
; if failed ok then
throwGhcExceptionIO (ProgramError "")
else do {
-- Link the expression itself
let ie = itbl_env pls
ce = closure_env pls
-- Link 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 -> MsgDoc -> IO a
dieWith dflags span msg = throwGhcExceptionIO (ProgramError (showSDoc dflags (mkLocMessage SevFatal span msg)))
checkNonStdWay :: DynFlags -> SrcSpan -> IO (Maybe FilePath)
checkNonStdWay dflags srcspan
| gopt Opt_ExternalInterpreter dflags = 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.
| interpWays == haskellWays = 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 dflags == normalObjectSuffix && not (null haskellWays)
= failNonStd dflags srcspan
| otherwise = return (Just (interpTag ++ "o"))
where
haskellWays = filter (not . wayRTSOnly) (ways dflags)
interpTag = case mkBuildTag interpWays 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
| dynamicGhc = text "with -dynamic"
| rtsIsProfiled = text "with -prof"
| otherwise = text "the normal way"
getLinkDeps :: HscEnv -> HomePackageTable
-> PersistentLinkerState
-> Maybe FilePath -- replace object suffices?
-> SrcSpan -- for error messages
-> [Module] -- If you need these
-> IO ([Linkable], [InstalledUnitId]) -- ... 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
this_pkg = thisPackage dflags
-- 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 InstalledUnitId -- accum. package dependencies
-> IO ([ModuleName], [InstalledUnitId]) -- 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 False)
iface <- case mb_iface of
Maybes.Failed err -> throwGhcExceptionIO (ProgramError (showSDoc dflags err))
Maybes.Succeeded iface -> return iface
when (mi_boot iface) $ link_boot_mod_error mod
let
pkg = moduleUnitId mod
deps = mi_deps iface
pkg_deps = dep_pkgs deps
(boot_deps, mod_deps) = partitionWith is_boot (dep_mods deps)
where is_boot (m,True) = Left m
is_boot (m,False) = Right m
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 pkg /= this_pkg
then follow_deps mods acc_mods (addOneToUniqDSet acc_pkgs' (toInstalledUnitId pkg))
else follow_deps (map (mkModule this_pkg) 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
********************************************************************* -}
linkDecls :: HscEnv -> SrcSpan -> CompiledByteCode -> IO ()
linkDecls hsc_env span cbc@CompiledByteCode{..} = do
-- Initialise the linker (if it's not been done already)
initDynLinker hsc_env
-- Take lock for the actual work.
modifyPLS $ \pls0 -> do
-- Link the packages and modules required
(pls, ok) <- linkDependencies 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
********************************************************************* -}
linkModule :: HscEnv -> Module -> IO ()
linkModule hsc_env mod = do
initDynLinker hsc_env
modifyPLS_ $ \pls -> do
(pls', ok) <- linkDependencies hsc_env pls noSrcSpan [mod]
if (failed ok) then throwGhcExceptionIO (ProgramError "could not link module")
else return pls'
{- **********************************************************************
Link some linkables
The linkables may consist of a mixture of
byte-code modules and object modules
********************************************************************* -}
linkModules :: HscEnv -> PersistentLinkerState -> [Linkable]
-> IO (PersistentLinkerState, SuccessFlag)
linkModules 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) <- dynLinkObjs 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
********************************************************************* -}
dynLinkObjs :: HscEnv -> PersistentLinkerState -> [Linkable]
-> IO (PersistentLinkerState, SuccessFlag)
dynLinkObjs hsc_env pls objs = do
-- Load the object files and link them
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 (hsc_dflags 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 do
return (pls1, Succeeded)
else do
pls2 <- unload_wkr hsc_env [] pls1
return (pls2, Failed)
dynLoadObjs :: HscEnv -> PersistentLinkerState -> [FilePath]
-> IO PersistentLinkerState
dynLoadObjs _ pls [] = return pls
dynLoadObjs hsc_env pls objs = do
let dflags = hsc_dflags hsc_env
let platform = targetPlatform dflags
let minus_ls = [ lib | Option ('-':'l':lib) <- ldInputs dflags ]
let minus_big_ls = [ lib | Option ('-':'L':lib) <- ldInputs dflags ]
(soFile, libPath , libName) <-
newTempLibName dflags TFL_CurrentModule (soExt 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
(\(lp, l) ->
[ Option ("-L" ++ lp)
, Option "-Xlinker"
, Option "-rpath"
, Option "-Xlinker"
, Option lp
, Option ("-l" ++ l)
])
(temp_sos pls)
++ concatMap
(\lp ->
[ Option ("-L" ++ lp)
, Option "-Xlinker"
, Option "-rpath"
, Option "-Xlinker"
, Option lp
])
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.
ways = [WayDyn],
buildTag = mkBuildTag [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 dflags2 objs (pkgs_loaded pls)
-- 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 pls }
Just err -> panic ("Loading temp shared object failed: " ++ err)
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 -> PersistentLinkerState -> [Linkable]
-> IO PersistentLinkerState
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)
initDynLinker hsc_env
new_pls
<- modifyPLS $ \pls -> do
pls1 <- unload_wkr hsc_env linkables pls
return (pls1, pls1)
let dflags = hsc_dflags hsc_env
debugTraceMsg dflags 3 $
text "unload: retaining objs" <+> ppr (objs_loaded new_pls)
debugTraceMsg dflags 3 $
text "unload: retaining bcos" <+> ppr (bcos_loaded new_pls)
return ()
unload_wkr :: HscEnv
-> [Linkable] -- stable linkables
-> PersistentLinkerState
-> IO PersistentLinkerState
-- Does the core unload business
-- (the wrapper blocks exceptions and deals with the PLS get and put)
unload_wkr hsc_env keep_linkables pls = do
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 pls)
(bcos_to_unload, remaining_bcos_loaded) =
partition (discard bcos_to_keep) (bcos_loaded pls)
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 (n,_) = isExternalName n &&
nameModule n `elemModuleSet` bcos_retained
itbl_env' = filterNameEnv keep_name (itbl_env pls)
closure_env' = filterNameEnv keep_name (closure_env pls)
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
| dynamicGhc = 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
= Object FilePath -- Full path name of a .o file, including trailing .o
-- 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
-- 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 (Object nm) = "(static) " ++ nm
showLS (Archive nm) = "(static archive) " ++ nm
showLS (DLL nm) = "(dynamic) " ++ nm
showLS (DLLPath nm) = "(dynamic) " ++ nm
showLS (Framework nm) = "(framework) " ++ nm
-- TODO: Make this type more precise
type LinkerUnitId = InstalledUnitId
-- | Link exactly the specified packages, and their dependents (unless of
-- course they are already linked). The dependents are linked
-- automatically, and it doesn't matter what order you specify the input
-- packages.
--
linkPackages :: HscEnv -> [LinkerUnitId] -> 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.
linkPackages hsc_env new_pkgs = do
-- It's probably not safe to try to load packages concurrently, so we take
-- a lock.
initDynLinker hsc_env
modifyPLS_ $ \pls -> do
linkPackages' hsc_env new_pkgs pls
linkPackages' :: HscEnv -> [LinkerUnitId] -> PersistentLinkerState
-> IO PersistentLinkerState
linkPackages' hsc_env new_pks pls = do
pkgs' <- link (pkgs_loaded pls) new_pks
return $! pls { pkgs_loaded = pkgs' }
where
dflags = hsc_dflags hsc_env
link :: [LinkerUnitId] -> [LinkerUnitId] -> IO [LinkerUnitId]
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 <- lookupInstalledPackage dflags new_pkg
= do { -- Link dependents first
pkgs' <- link pkgs (depends pkg_cfg)
-- Now link the package itself
; linkPackage hsc_env pkg_cfg
; return (new_pkg : pkgs') }
| otherwise
= throwGhcExceptionIO (CmdLineError ("unknown package: " ++ unpackFS (installedUnitIdFS new_pkg)))
linkPackage :: HscEnv -> PackageConfig -> IO ()
linkPackage hsc_env pkg
= do
let dflags = hsc_dflags hsc_env
platform = targetPlatform dflags
dirs | interpreterDynamic dflags = Packages.libraryDynDirs pkg
| otherwise = Packages.libraryDirs pkg
let hs_libs = Packages.hsLibraries pkg
-- The FFI GHCi import lib isn't needed as
-- compiler/ghci/Linker.hs + 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.
extra_libs =
(if null (Packages.extraGHCiLibraries pkg)
then Packages.extraLibraries pkg
else Packages.extraGHCiLibraries pkg)
++ [ lib | '-':'l':lib <- Packages.ldOptions pkg ]
-- See Note [Fork/Exec Windows]
gcc_paths <- getGCCPaths dflags (platformOS platform)
hs_classifieds
<- mapM (locateLib hsc_env True dirs gcc_paths) hs_libs'
extra_classifieds
<- mapM (locateLib hsc_env False dirs 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 | Object obj <- classifieds ]
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
pathCache <- mapM (addLibrarySearchPath hsc_env) all_paths
maybePutStr dflags
("Loading package " ++ sourcePackageIdString pkg ++ " ... ")
-- See comments with partOfGHCi
when (packageName pkg `notElem` partOfGHCi) $ do
loadFrameworks hsc_env platform pkg
mapM_ (load_dyn hsc_env)
(known_dlls ++ map (mkSOName platform) dlls)
-- 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 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 dflags "done."
else let errmsg = "unable to load package `"
++ sourcePackageIdString pkg ++ "'"
in throwGhcExceptionIO (InstallationError errmsg)
-- 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 -> FilePath -> IO ()
load_dyn hsc_env dll = do
r <- loadDLL hsc_env dll
case r of
Nothing -> return ()
Just err -> throwGhcExceptionIO (CmdLineError ("can't load .so/.DLL for: "
++ dll ++ " (" ++ err ++ ")" ))
loadFrameworks :: HscEnv -> Platform -> PackageConfig -> IO ()
loadFrameworks hsc_env platform pkg
= when (platformUsesFrameworks platform) $ mapM_ load frameworks
where
fw_dirs = Packages.frameworkDirs pkg
frameworks = Packages.frameworks pkg
load fw = do r <- loadFramework hsc_env fw_dirs fw
case r of
Nothing -> return ()
Just err -> throwGhcExceptionIO (CmdLineError ("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 (libfoo.so)
-- 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 check for system dynamic libraries (e.g. kernel32.dll on windows)
-- 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
--
= findDll `orElse`
findSysDll `orElse`
tryImpLib `orElse`
findArchive `orElse`
tryGcc `orElse`
assumeDll
| loading_dynamic_hs_libs -- search for .so libraries first.
= findHSDll `orElse`
findDynObject `orElse`
assumeDll
| loading_profiled_hs_libs -- only a libHSfoo_p.a archive will do.
= findArchive `orElse`
assumeDll
| otherwise
-- HSfoo.o is the best, but only works for the normal way
-- libHSfoo.a is the backup option.
= findObject `orElse`
findArchive `orElse`
assumeDll
where
dflags = hsc_dflags hsc_env
dirs = lib_dirs ++ gcc_dirs
obj_file = lib <.> "o"
dyn_obj_file = lib <.> "dyn_o"
arch_files = [ "lib" ++ lib ++ lib_tag <.> "a"
, lib <.> "a" -- native code has no lib_tag
]
lib_tag = if is_hs && loading_profiled_hs_libs then "_p" else ""
loading_profiled_hs_libs = interpreterProfiled dflags
loading_dynamic_hs_libs = interpreterDynamic dflags
import_libs = [ lib <.> "lib" , "lib" ++ lib <.> "lib"
, "lib" ++ lib <.> "dll.a", lib <.> "dll.a"
]
hs_dyn_lib_name = lib ++ '-':programName dflags ++ projectVersion dflags
hs_dyn_lib_file = mkHsSOName platform hs_dyn_lib_name
so_name = mkSOName 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 Object) $ findFile dirs obj_file
findDynObject = liftM (fmap Object) $ 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 = liftM (fmap DLLPath) $ findFile dirs dyn_lib_file
findSysDll = fmap (fmap $ DLL . dropExtension . takeFileName) $
findSystemLibrary hsc_env so_name
tryGcc = let search = searchForLibUsingGcc 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
in apply $ short : full : map gcc files
tryImpLib = case os of
OSMinGW32 ->
let implib name = liftM (fmap Archive) $
findFile dirs name
in apply (map implib import_libs)
_ -> return Nothing
assumeDll = return (DLL lib)
infixr `orElse`
f `orElse` g = f >>= maybe g return
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 :: DynFlags -> String -> [FilePath] -> IO (Maybe FilePath)
searchForLibUsingGcc 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 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 return (Just file)
-- | Retrieve the list of search directory GCC and the System use to find
-- libraries and components. See Note [Fork/Exec Windows].
getGCCPaths :: DynFlags -> OS -> IO [FilePath]
getGCCPaths dflags os
= case os of
OSMinGW32 ->
do gcc_dirs <- getGccSearchDirectory 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 :: DynFlags -> String -> IO [FilePath]
getGccSearchDirectory dflags key = do
cache <- readIORef gccSearchDirCache
case lookup key cache of
Just x -> return x
Nothing -> do
str <- askLd 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
-- ----------------------------------------------------------------------------
-- Loading a dynamic library (dlopen()-ish on Unix, LoadLibrary-ish on Win32)
-- Darwin / MacOS X only: load a framework
-- a framework is a dynamic library packaged inside a directory of the same
-- name. They are searched for in different paths than normal libraries.
loadFramework :: HscEnv -> [FilePath] -> FilePath -> IO (Maybe String)
loadFramework hsc_env extraPaths rootname
= do { either_dir <- tryIO getHomeDirectory
; let homeFrameworkPath = case either_dir of
Left _ -> []
Right dir -> [dir </> "Library/Frameworks"]
ps = extraPaths ++ homeFrameworkPath ++ defaultFrameworkPaths
; mb_fwk <- findFile ps fwk_file
; case mb_fwk of
Just fwk_path -> loadDLL hsc_env fwk_path
Nothing -> return (Just "not found") }
-- Tried all our known library paths, but dlopen()
-- has no built-in paths for frameworks: give up
where
fwk_file = rootname <.> "framework" </> rootname
-- sorry for the hardcoded paths, I hope they won't change anytime soon:
defaultFrameworkPaths = ["/Library/Frameworks", "/System/Library/Frameworks"]
{- **********************************************************************
Helper functions
********************************************************************* -}
maybePutStr :: DynFlags -> String -> IO ()
maybePutStr dflags s
= when (verbosity dflags > 1) $
putLogMsg dflags
NoReason
SevInteractive
noSrcSpan
(defaultUserStyle dflags)
(text s)
maybePutStrLn :: DynFlags -> String -> IO ()
maybePutStrLn dflags s = maybePutStr dflags (s ++ "\n")