1 -- -----------------------------------------------------------------------------
3 -- (c) The University of Glasgow, 2005
7 -- -----------------------------------------------------------------------------
13 defaultCleanupHandler,
17 -- * Flags and settings
18 DynFlags(..), DynFlag(..), Severity(..), GhcMode(..), HscTarget(..), dopt,
25 Target(..), TargetId(..), Phase,
32 -- * Loading\/compiling the program
34 load, LoadHowMuch(..), SuccessFlag(..), -- also does depanal
35 workingDirectoryChanged,
36 checkModule, CheckedModule(..),
37 TypecheckedSource, ParsedSource, RenamedSource,
39 -- * Inspecting the module structure of the program
40 ModuleGraph, ModSummary(..), ModLocation(..),
45 -- * Inspecting modules
50 modInfoPrintUnqualified,
53 modInfoIsExportedName,
58 PrintUnqualified, alwaysQualify,
60 -- * Interactive evaluation
61 getBindings, getPrintUnqual,
63 setContext, getContext,
78 -- * Abstract syntax elements
81 Module, mkModule, pprModule,
85 nameModule, nameParent_maybe, pprParenSymName, nameSrcLoc,
91 isImplicitId, isDeadBinder,
92 isExportedId, isLocalId, isGlobalId,
94 isPrimOpId, isFCallId, isClassOpId_maybe,
95 isDataConWorkId, idDataCon,
96 isBottomingId, isDictonaryId,
97 recordSelectorFieldLabel,
99 -- ** Type constructors
101 tyConTyVars, tyConDataCons, tyConArity,
102 isClassTyCon, isSynTyCon, isNewTyCon, isPrimTyCon, isFunTyCon,
103 synTyConDefn, synTyConRhs,
109 -- ** Data constructors
111 dataConSig, dataConType, dataConTyCon, dataConFieldLabels,
112 dataConIsInfix, isVanillaDataCon,
114 StrictnessMark(..), isMarkedStrict,
118 classMethods, classSCTheta, classTvsFds,
123 instanceDFunId, pprInstance, pprInstanceHdr,
125 -- ** Types and Kinds
126 Type, dropForAlls, splitForAllTys, funResultTy, pprParendType,
129 ThetaType, pprThetaArrow,
135 module HsSyn, -- ToDo: remove extraneous bits
139 defaultFixity, maxPrecedence,
143 -- ** Source locations
147 GhcException(..), showGhcException,
157 * inline bits of HscMain here to simplify layering: hscTcExpr, hscStmt.
158 * we need to expose DynFlags, so should parseDynamicFlags really be
159 part of this interface?
160 * what StaticFlags should we expose, if any?
163 #include "HsVersions.h"
166 import qualified Linker
167 import Linker ( HValue, extendLinkEnv )
168 import TcRnDriver ( tcRnLookupRdrName, tcRnGetInfo,
169 tcRnLookupName, getModuleExports )
170 import RdrName ( plusGlobalRdrEnv, Provenance(..),
171 ImportSpec(..), ImpDeclSpec(..), ImpItemSpec(..),
172 emptyGlobalRdrEnv, mkGlobalRdrEnv )
173 import HscMain ( hscParseIdentifier, hscStmt, hscTcExpr, hscKcType )
174 import Type ( tidyType )
175 import VarEnv ( emptyTidyEnv )
176 import GHC.Exts ( unsafeCoerce# )
179 import Packages ( initPackages )
180 import NameSet ( NameSet, nameSetToList, elemNameSet )
181 import RdrName ( GlobalRdrEnv, GlobalRdrElt(..), RdrName(..),
184 import Type ( Kind, Type, dropForAlls, PredType, ThetaType,
185 pprThetaArrow, pprParendType, splitForAllTys,
187 import Id ( Id, idType, isImplicitId, isDeadBinder,
188 isExportedId, isLocalId, isGlobalId,
189 isRecordSelector, recordSelectorFieldLabel,
190 isPrimOpId, isFCallId, isClassOpId_maybe,
191 isDataConWorkId, idDataCon,
194 import TysPrim ( alphaTyVars )
195 import TyCon ( TyCon, isClassTyCon, isSynTyCon, isNewTyCon,
196 isPrimTyCon, isFunTyCon, tyConArity,
197 tyConTyVars, tyConDataCons, synTyConDefn, synTyConRhs )
198 import Class ( Class, classSCTheta, classTvsFds, classMethods )
199 import FunDeps ( pprFundeps )
200 import DataCon ( DataCon, dataConWrapId, dataConSig, dataConTyCon,
201 dataConFieldLabels, dataConStrictMarks,
202 dataConIsInfix, isVanillaDataCon )
203 import Name ( Name, nameModule, NamedThing(..), nameParent_maybe,
204 nameSrcLoc, nameOccName )
205 import OccName ( parenSymOcc )
206 import NameEnv ( nameEnvElts )
207 import InstEnv ( Instance, instanceDFunId, pprInstance, pprInstanceHdr )
209 import DriverPipeline
210 import DriverPhases ( Phase(..), isHaskellSrcFilename, startPhase )
211 import GetImports ( getImports )
212 import Packages ( isHomePackage )
214 import HscMain ( newHscEnv, hscFileCheck, HscResult(..) )
218 import SysTools ( initSysTools, cleanTempFiles )
223 import Bag ( unitBag )
224 import ErrUtils ( Severity(..), showPass, fatalErrorMsg, debugTraceMsg,
225 mkPlainErrMsg, printBagOfErrors, printErrorsAndWarnings )
226 import qualified ErrUtils
228 import StringBuffer ( StringBuffer, hGetStringBuffer )
230 import SysTools ( cleanTempFilesExcept )
232 import TcType ( tcSplitSigmaTy, isDictTy )
233 import Maybes ( expectJust, mapCatMaybes )
235 import Control.Concurrent
236 import System.Directory ( getModificationTime, doesFileExist )
237 import Data.Maybe ( isJust, isNothing, fromJust )
238 import Data.List ( partition, nub )
239 import qualified Data.List as List
240 import Control.Monad ( unless, when )
241 import System.Exit ( exitWith, ExitCode(..) )
242 import System.Time ( ClockTime )
243 import Control.Exception as Exception hiding (handle)
246 import System.IO.Error ( isDoesNotExistError )
247 import System.IO.Unsafe ( unsafePerformIO )
248 import Prelude hiding (init)
250 #if __GLASGOW_HASKELL__ < 600
251 import System.IO as System.IO.Error ( try )
253 import System.IO.Error ( try )
256 -- -----------------------------------------------------------------------------
257 -- Exception handlers
259 -- | Install some default exception handlers and run the inner computation.
260 -- Unless you want to handle exceptions yourself, you should wrap this around
261 -- the top level of your program. The default handlers output the error
262 -- message(s) to stderr and exit cleanly.
263 defaultErrorHandler :: DynFlags -> IO a -> IO a
264 defaultErrorHandler dflags inner =
265 -- top-level exception handler: any unrecognised exception is a compiler bug.
266 handle (\exception -> do
269 -- an IO exception probably isn't our fault, so don't panic
271 fatalErrorMsg dflags (text (show exception))
272 AsyncException StackOverflow ->
273 fatalErrorMsg dflags (text "stack overflow: use +RTS -K<size> to increase it")
275 fatalErrorMsg dflags (text (show (Panic (show exception))))
276 exitWith (ExitFailure 1)
279 -- program errors: messages with locations attached. Sometimes it is
280 -- convenient to just throw these as exceptions.
281 handleDyn (\dyn -> do printBagOfErrors dflags (unitBag dyn)
282 exitWith (ExitFailure 1)) $
284 -- error messages propagated as exceptions
285 handleDyn (\dyn -> do
288 PhaseFailed _ code -> exitWith code
289 Interrupted -> exitWith (ExitFailure 1)
290 _ -> do fatalErrorMsg dflags (text (show (dyn :: GhcException)))
291 exitWith (ExitFailure 1)
295 -- | Install a default cleanup handler to remove temporary files
296 -- deposited by a GHC run. This is seperate from
297 -- 'defaultErrorHandler', because you might want to override the error
298 -- handling, but still get the ordinary cleanup behaviour.
299 defaultCleanupHandler :: DynFlags -> IO a -> IO a
300 defaultCleanupHandler dflags inner =
301 -- make sure we clean up after ourselves
302 later (unless (dopt Opt_KeepTmpFiles dflags) $
303 cleanTempFiles dflags)
304 -- exceptions will be blocked while we clean the temporary files,
305 -- so there shouldn't be any difficulty if we receive further
310 -- | Initialises GHC. This must be done /once/ only. Takes the
311 -- command-line arguments. All command-line arguments which aren't
312 -- understood by GHC will be returned.
314 init :: [String] -> IO [String]
317 main_thread <- myThreadId
318 putMVar interruptTargetThread [main_thread]
319 installSignalHandlers
321 -- Grab the -B option if there is one
322 let (minusB_args, argv1) = partition (prefixMatch "-B") args
323 dflags0 <- initSysTools minusB_args defaultDynFlags
324 writeIORef v_initDynFlags dflags0
326 -- Parse the static flags
327 argv2 <- parseStaticFlags argv1
330 GLOBAL_VAR(v_initDynFlags, error "initDynFlags", DynFlags)
331 -- stores the DynFlags between the call to init and subsequent
332 -- calls to newSession.
334 -- | Starts a new session. A session consists of a set of loaded
335 -- modules, a set of options (DynFlags), and an interactive context.
336 -- ToDo: GhcMode should say "keep typechecked code" and\/or "keep renamed
338 newSession :: GhcMode -> IO Session
340 dflags0 <- readIORef v_initDynFlags
341 dflags <- initDynFlags dflags0
342 env <- newHscEnv dflags{ ghcMode=mode }
346 -- tmp: this breaks the abstraction, but required because DriverMkDepend
347 -- needs to call the Finder. ToDo: untangle this.
348 sessionHscEnv :: Session -> IO HscEnv
349 sessionHscEnv (Session ref) = readIORef ref
351 withSession :: Session -> (HscEnv -> IO a) -> IO a
352 withSession (Session ref) f = do h <- readIORef ref; f h
354 modifySession :: Session -> (HscEnv -> HscEnv) -> IO ()
355 modifySession (Session ref) f = do h <- readIORef ref; writeIORef ref $! f h
357 -- -----------------------------------------------------------------------------
360 -- | Grabs the DynFlags from the Session
361 getSessionDynFlags :: Session -> IO DynFlags
362 getSessionDynFlags s = withSession s (return . hsc_dflags)
364 -- | Updates the DynFlags in a Session
365 setSessionDynFlags :: Session -> DynFlags -> IO ()
366 setSessionDynFlags s dflags = modifySession s (\h -> h{ hsc_dflags = dflags })
368 -- | If there is no -o option, guess the name of target executable
369 -- by using top-level source file name as a base.
370 guessOutputFile :: Session -> IO ()
371 guessOutputFile s = modifySession s $ \env ->
372 let dflags = hsc_dflags env
373 mod_graph = hsc_mod_graph env
374 mainModuleSrcPath, guessedName :: Maybe String
375 mainModuleSrcPath = do
376 let isMain = (== mainModIs dflags) . ms_mod
377 [ms] <- return (filter isMain mod_graph)
378 ml_hs_file (ms_location ms)
379 guessedName = fmap basenameOf mainModuleSrcPath
381 case outputFile dflags of
383 Nothing -> env { hsc_dflags = dflags { outputFile = guessedName } }
385 -- -----------------------------------------------------------------------------
388 -- ToDo: think about relative vs. absolute file paths. And what
389 -- happens when the current directory changes.
391 -- | Sets the targets for this session. Each target may be a module name
392 -- or a filename. The targets correspond to the set of root modules for
393 -- the program\/library. Unloading the current program is achieved by
394 -- setting the current set of targets to be empty, followed by load.
395 setTargets :: Session -> [Target] -> IO ()
396 setTargets s targets = modifySession s (\h -> h{ hsc_targets = targets })
398 -- | returns the current set of targets
399 getTargets :: Session -> IO [Target]
400 getTargets s = withSession s (return . hsc_targets)
402 -- | Add another target
403 addTarget :: Session -> Target -> IO ()
405 = modifySession s (\h -> h{ hsc_targets = target : hsc_targets h })
408 removeTarget :: Session -> TargetId -> IO ()
409 removeTarget s target_id
410 = modifySession s (\h -> h{ hsc_targets = filter (hsc_targets h) })
412 filter targets = [ t | t@(Target id _) <- targets, id /= target_id ]
414 -- Attempts to guess what Target a string refers to. This function implements
415 -- the --make/GHCi command-line syntax for filenames:
417 -- - if the string looks like a Haskell source filename, then interpret
419 -- - if adding a .hs or .lhs suffix yields the name of an existing file,
421 -- - otherwise interpret the string as a module name
423 guessTarget :: String -> Maybe Phase -> IO Target
424 guessTarget file (Just phase)
425 = return (Target (TargetFile file (Just phase)) Nothing)
426 guessTarget file Nothing
427 | isHaskellSrcFilename file
428 = return (Target (TargetFile file Nothing) Nothing)
430 = do exists <- doesFileExist hs_file
432 then return (Target (TargetFile hs_file Nothing) Nothing)
434 exists <- doesFileExist lhs_file
436 then return (Target (TargetFile lhs_file Nothing) Nothing)
438 return (Target (TargetModule (mkModule file)) Nothing)
440 hs_file = file `joinFileExt` "hs"
441 lhs_file = file `joinFileExt` "lhs"
443 -- -----------------------------------------------------------------------------
444 -- Loading the program
446 -- Perform a dependency analysis starting from the current targets
447 -- and update the session with the new module graph.
448 depanal :: Session -> [Module] -> Bool -> IO (Maybe ModuleGraph)
449 depanal (Session ref) excluded_mods allow_dup_roots = do
450 hsc_env <- readIORef ref
452 dflags = hsc_dflags hsc_env
453 gmode = ghcMode (hsc_dflags hsc_env)
454 targets = hsc_targets hsc_env
455 old_graph = hsc_mod_graph hsc_env
457 showPass dflags "Chasing dependencies"
458 when (gmode == BatchCompile) $
459 debugTraceMsg dflags 1 (hcat [
460 text "Chasing modules from: ",
461 hcat (punctuate comma (map pprTarget targets))])
463 r <- downsweep hsc_env old_graph excluded_mods allow_dup_roots
465 Just mod_graph -> writeIORef ref hsc_env{ hsc_mod_graph = mod_graph }
470 -- | The result of load.
472 = LoadOk Errors -- ^ all specified targets were loaded successfully.
473 | LoadFailed Errors -- ^ not all modules were loaded.
475 type Errors = [String]
477 data ErrMsg = ErrMsg {
478 errMsgSeverity :: Severity, -- warning, error, etc.
479 errMsgSpans :: [SrcSpan],
480 errMsgShortDoc :: Doc,
481 errMsgExtraInfo :: Doc
488 | LoadDependenciesOf Module
490 -- | Try to load the program. If a Module is supplied, then just
491 -- attempt to load up to this target. If no Module is supplied,
492 -- then try to load all targets.
493 load :: Session -> LoadHowMuch -> IO SuccessFlag
494 load s@(Session ref) how_much
496 -- Dependency analysis first. Note that this fixes the module graph:
497 -- even if we don't get a fully successful upsweep, the full module
498 -- graph is still retained in the Session. We can tell which modules
499 -- were successfully loaded by inspecting the Session's HPT.
500 mb_graph <- depanal s [] False
502 Just mod_graph -> load2 s how_much mod_graph
503 Nothing -> return Failed
505 load2 s@(Session ref) how_much mod_graph = do
507 hsc_env <- readIORef ref
509 let hpt1 = hsc_HPT hsc_env
510 let dflags = hsc_dflags hsc_env
511 let ghci_mode = ghcMode dflags -- this never changes
513 -- The "bad" boot modules are the ones for which we have
514 -- B.hs-boot in the module graph, but no B.hs
515 -- The downsweep should have ensured this does not happen
517 let all_home_mods = [ms_mod s | s <- mod_graph, not (isBootSummary s)]
519 bad_boot_mods = [s | s <- mod_graph, isBootSummary s,
520 not (ms_mod s `elem` all_home_mods)]
522 ASSERT( null bad_boot_mods ) return ()
524 -- mg2_with_srcimps drops the hi-boot nodes, returning a
525 -- graph with cycles. Among other things, it is used for
526 -- backing out partially complete cycles following a failed
527 -- upsweep, and for removing from hpt all the modules
528 -- not in strict downwards closure, during calls to compile.
529 let mg2_with_srcimps :: [SCC ModSummary]
530 mg2_with_srcimps = topSortModuleGraph True mod_graph Nothing
532 -- check the stability property for each module.
533 stable_mods@(stable_obj,stable_bco)
534 | BatchCompile <- ghci_mode = ([],[])
535 | otherwise = checkStability hpt1 mg2_with_srcimps all_home_mods
537 -- prune bits of the HPT which are definitely redundant now,
539 pruned_hpt = pruneHomePackageTable hpt1
540 (flattenSCCs mg2_with_srcimps)
545 debugTraceMsg dflags 2 (text "Stable obj:" <+> ppr stable_obj $$
546 text "Stable BCO:" <+> ppr stable_bco)
548 -- Unload any modules which are going to be re-linked this time around.
549 let stable_linkables = [ linkable
550 | m <- stable_obj++stable_bco,
551 Just hmi <- [lookupModuleEnv pruned_hpt m],
552 Just linkable <- [hm_linkable hmi] ]
553 unload hsc_env stable_linkables
555 -- We could at this point detect cycles which aren't broken by
556 -- a source-import, and complain immediately, but it seems better
557 -- to let upsweep_mods do this, so at least some useful work gets
558 -- done before the upsweep is abandoned.
559 --hPutStrLn stderr "after tsort:\n"
560 --hPutStrLn stderr (showSDoc (vcat (map ppr mg2)))
562 -- Now do the upsweep, calling compile for each module in
563 -- turn. Final result is version 3 of everything.
565 -- Topologically sort the module graph, this time including hi-boot
566 -- nodes, and possibly just including the portion of the graph
567 -- reachable from the module specified in the 2nd argument to load.
568 -- This graph should be cycle-free.
569 -- If we're restricting the upsweep to a portion of the graph, we
570 -- also want to retain everything that is still stable.
571 let full_mg :: [SCC ModSummary]
572 full_mg = topSortModuleGraph False mod_graph Nothing
574 maybe_top_mod = case how_much of
576 LoadDependenciesOf m -> Just m
579 partial_mg0 :: [SCC ModSummary]
580 partial_mg0 = topSortModuleGraph False mod_graph maybe_top_mod
582 -- LoadDependenciesOf m: we want the upsweep to stop just
583 -- short of the specified module (unless the specified module
586 | LoadDependenciesOf mod <- how_much
587 = ASSERT( case last partial_mg0 of
588 AcyclicSCC ms -> ms_mod ms == mod; _ -> False )
589 List.init partial_mg0
595 | AcyclicSCC ms <- full_mg,
596 ms_mod ms `elem` stable_obj++stable_bco,
597 ms_mod ms `notElem` [ ms_mod ms' |
598 AcyclicSCC ms' <- partial_mg ] ]
600 mg = stable_mg ++ partial_mg
602 -- clean up between compilations
603 let cleanup = cleanTempFilesExcept dflags
604 (ppFilesFromSummaries (flattenSCCs mg2_with_srcimps))
606 (upsweep_ok, hsc_env1, modsUpswept)
607 <- upsweep (hsc_env { hsc_HPT = emptyHomePackageTable })
608 pruned_hpt stable_mods cleanup mg
610 -- Make modsDone be the summaries for each home module now
611 -- available; this should equal the domain of hpt3.
612 -- Get in in a roughly top .. bottom order (hence reverse).
614 let modsDone = reverse modsUpswept
616 -- Try and do linking in some form, depending on whether the
617 -- upsweep was completely or only partially successful.
619 if succeeded upsweep_ok
622 -- Easy; just relink it all.
623 do debugTraceMsg dflags 2 (text "Upsweep completely successful.")
625 -- Clean up after ourselves
626 cleanTempFilesExcept dflags (ppFilesFromSummaries modsDone)
628 -- Issue a warning for the confusing case where the user
629 -- said '-o foo' but we're not going to do any linking.
630 -- We attempt linking if either (a) one of the modules is
631 -- called Main, or (b) the user said -no-hs-main, indicating
632 -- that main() is going to come from somewhere else.
634 let ofile = outputFile dflags
635 let no_hs_main = dopt Opt_NoHsMain dflags
637 main_mod = mainModIs dflags
638 a_root_is_Main = any ((==main_mod).ms_mod) mod_graph
639 do_linking = a_root_is_Main || no_hs_main
641 when (ghci_mode == BatchCompile && isJust ofile && not do_linking) $
642 debugTraceMsg dflags 1 (text ("Warning: output was redirected with -o, " ++
643 "but no output will be generated\n" ++
644 "because there is no " ++ moduleString main_mod ++ " module."))
646 -- link everything together
647 linkresult <- link ghci_mode dflags do_linking (hsc_HPT hsc_env1)
649 loadFinish Succeeded linkresult ref hsc_env1
652 -- Tricky. We need to back out the effects of compiling any
653 -- half-done cycles, both so as to clean up the top level envs
654 -- and to avoid telling the interactive linker to link them.
655 do debugTraceMsg dflags 2 (text "Upsweep partially successful.")
658 = map ms_mod modsDone
659 let mods_to_zap_names
660 = findPartiallyCompletedCycles modsDone_names
663 = filter ((`notElem` mods_to_zap_names).ms_mod)
666 let hpt4 = retainInTopLevelEnvs (map ms_mod mods_to_keep)
669 -- Clean up after ourselves
670 cleanTempFilesExcept dflags (ppFilesFromSummaries mods_to_keep)
672 -- there should be no Nothings where linkables should be, now
673 ASSERT(all (isJust.hm_linkable)
674 (moduleEnvElts (hsc_HPT hsc_env))) do
676 -- Link everything together
677 linkresult <- link ghci_mode dflags False hpt4
679 let hsc_env4 = hsc_env1{ hsc_HPT = hpt4 }
680 loadFinish Failed linkresult ref hsc_env4
682 -- Finish up after a load.
684 -- If the link failed, unload everything and return.
685 loadFinish all_ok Failed ref hsc_env
686 = do unload hsc_env []
687 writeIORef ref $! discardProg hsc_env
690 -- Empty the interactive context and set the module context to the topmost
691 -- newly loaded module, or the Prelude if none were loaded.
692 loadFinish all_ok Succeeded ref hsc_env
693 = do writeIORef ref $! hsc_env{ hsc_IC = emptyInteractiveContext }
697 -- Forget the current program, but retain the persistent info in HscEnv
698 discardProg :: HscEnv -> HscEnv
700 = hsc_env { hsc_mod_graph = emptyMG,
701 hsc_IC = emptyInteractiveContext,
702 hsc_HPT = emptyHomePackageTable }
704 -- used to fish out the preprocess output files for the purposes of
705 -- cleaning up. The preprocessed file *might* be the same as the
706 -- source file, but that doesn't do any harm.
707 ppFilesFromSummaries summaries = [ fn | Just fn <- map ms_hspp_file summaries ]
709 -- -----------------------------------------------------------------------------
713 CheckedModule { parsedSource :: ParsedSource,
714 renamedSource :: Maybe RenamedSource,
715 typecheckedSource :: Maybe TypecheckedSource,
716 checkedModuleInfo :: Maybe ModuleInfo
718 -- ToDo: improvements that could be made here:
719 -- if the module succeeded renaming but not typechecking,
720 -- we can still get back the GlobalRdrEnv and exports, so
721 -- perhaps the ModuleInfo should be split up into separate
722 -- fields within CheckedModule.
724 type ParsedSource = Located (HsModule RdrName)
725 type RenamedSource = HsGroup Name
726 type TypecheckedSource = LHsBinds Id
729 -- - things that aren't in the output of the renamer:
732 -- - things that aren't in the output of the typechecker right now:
736 -- - type/data/newtype declarations
737 -- - class declarations
739 -- - extra things in the typechecker's output:
740 -- - default methods are turned into top-level decls.
741 -- - dictionary bindings
744 -- | This is the way to get access to parsed and typechecked source code
745 -- for a module. 'checkModule' loads all the dependencies of the specified
746 -- module in the Session, and then attempts to typecheck the module. If
747 -- successful, it returns the abstract syntax for the module.
748 checkModule :: Session -> Module -> IO (Maybe CheckedModule)
749 checkModule session@(Session ref) mod = do
750 -- load up the dependencies first
751 r <- load session (LoadDependenciesOf mod)
752 if (failed r) then return Nothing else do
754 -- now parse & typecheck the module
755 hsc_env <- readIORef ref
756 let mg = hsc_mod_graph hsc_env
757 case [ ms | ms <- mg, ms_mod ms == mod ] of
760 -- Add in the OPTIONS from the source file This is nasty:
761 -- we've done this once already, in the compilation manager
762 -- It might be better to cache the flags in the
763 -- ml_hspp_file field, say
764 let dflags0 = hsc_dflags hsc_env
765 hspp_buf = expectJust "GHC.checkModule" (ms_hspp_buf ms)
766 filename = fromJust (ml_hs_file (ms_location ms))
767 opts = getOptionsFromStringBuffer hspp_buf filename
768 (dflags1,leftovers) <- parseDynamicFlags dflags0 (map snd opts)
769 if (not (null leftovers))
770 then do printErrorsAndWarnings dflags1 (optionsErrorMsgs leftovers opts filename)
774 r <- hscFileCheck hsc_env{hsc_dflags=dflags1} ms
778 HscChecked parsed renamed Nothing ->
779 return (Just (CheckedModule {
780 parsedSource = parsed,
781 renamedSource = renamed,
782 typecheckedSource = Nothing,
783 checkedModuleInfo = Nothing }))
784 HscChecked parsed renamed
785 (Just (tc_binds, rdr_env, details)) -> do
786 let minf = ModuleInfo {
787 minf_type_env = md_types details,
788 minf_exports = md_exports details,
789 minf_rdr_env = Just rdr_env,
790 minf_instances = md_insts details
792 return (Just (CheckedModule {
793 parsedSource = parsed,
794 renamedSource = renamed,
795 typecheckedSource = Just tc_binds,
796 checkedModuleInfo = Just minf }))
800 -- ---------------------------------------------------------------------------
803 unload :: HscEnv -> [Linkable] -> IO ()
804 unload hsc_env stable_linkables -- Unload everthing *except* 'stable_linkables'
805 = case ghcMode (hsc_dflags hsc_env) of
806 BatchCompile -> return ()
807 JustTypecheck -> return ()
809 Interactive -> Linker.unload (hsc_dflags hsc_env) stable_linkables
811 Interactive -> panic "unload: no interpreter"
813 other -> panic "unload: strange mode"
815 -- -----------------------------------------------------------------------------
819 Stability tells us which modules definitely do not need to be recompiled.
820 There are two main reasons for having stability:
822 - avoid doing a complete upsweep of the module graph in GHCi when
823 modules near the bottom of the tree have not changed.
825 - to tell GHCi when it can load object code: we can only load object code
826 for a module when we also load object code fo all of the imports of the
827 module. So we need to know that we will definitely not be recompiling
828 any of these modules, and we can use the object code.
830 NB. stability is of no importance to BatchCompile at all, only Interactive.
831 (ToDo: what about JustTypecheck?)
833 The stability check is as follows. Both stableObject and
834 stableBCO are used during the upsweep phase later.
837 stable m = stableObject m || stableBCO m
840 all stableObject (imports m)
841 && old linkable does not exist, or is == on-disk .o
842 && date(on-disk .o) > date(.hs)
845 all stable (imports m)
846 && date(BCO) > date(.hs)
849 These properties embody the following ideas:
851 - if a module is stable:
852 - if it has been compiled in a previous pass (present in HPT)
853 then it does not need to be compiled or re-linked.
854 - if it has not been compiled in a previous pass,
855 then we only need to read its .hi file from disk and
856 link it to produce a ModDetails.
858 - if a modules is not stable, we will definitely be at least
859 re-linking, and possibly re-compiling it during the upsweep.
860 All non-stable modules can (and should) therefore be unlinked
863 - Note that objects are only considered stable if they only depend
864 on other objects. We can't link object code against byte code.
868 :: HomePackageTable -- HPT from last compilation
869 -> [SCC ModSummary] -- current module graph (cyclic)
870 -> [Module] -- all home modules
871 -> ([Module], -- stableObject
872 [Module]) -- stableBCO
874 checkStability hpt sccs all_home_mods = foldl checkSCC ([],[]) sccs
876 checkSCC (stable_obj, stable_bco) scc0
877 | stableObjects = (scc_mods ++ stable_obj, stable_bco)
878 | stableBCOs = (stable_obj, scc_mods ++ stable_bco)
879 | otherwise = (stable_obj, stable_bco)
881 scc = flattenSCC scc0
882 scc_mods = map ms_mod scc
883 home_module m = m `elem` all_home_mods && m `notElem` scc_mods
885 scc_allimps = nub (filter home_module (concatMap ms_allimps scc))
886 -- all imports outside the current SCC, but in the home pkg
888 stable_obj_imps = map (`elem` stable_obj) scc_allimps
889 stable_bco_imps = map (`elem` stable_bco) scc_allimps
896 and (zipWith (||) stable_obj_imps stable_bco_imps)
900 | Just t <- ms_obj_date ms = t >= ms_hs_date ms
904 same_as_prev t = case lookupModuleEnv hpt (ms_mod ms) of
905 Just hmi | Just l <- hm_linkable hmi
906 -> isObjectLinkable l && t == linkableTime l
908 -- why '>=' rather than '>' above? If the filesystem stores
909 -- times to the nearset second, we may occasionally find that
910 -- the object & source have the same modification time,
911 -- especially if the source was automatically generated
912 -- and compiled. Using >= is slightly unsafe, but it matches
916 = case lookupModuleEnv hpt (ms_mod ms) of
917 Just hmi | Just l <- hm_linkable hmi ->
918 not (isObjectLinkable l) &&
919 linkableTime l >= ms_hs_date ms
922 ms_allimps :: ModSummary -> [Module]
923 ms_allimps ms = map unLoc (ms_srcimps ms ++ ms_imps ms)
925 -- -----------------------------------------------------------------------------
926 -- Prune the HomePackageTable
928 -- Before doing an upsweep, we can throw away:
930 -- - For non-stable modules:
931 -- - all ModDetails, all linked code
932 -- - all unlinked code that is out of date with respect to
935 -- This is VERY IMPORTANT otherwise we'll end up requiring 2x the
936 -- space at the end of the upsweep, because the topmost ModDetails of the
937 -- old HPT holds on to the entire type environment from the previous
940 pruneHomePackageTable
943 -> ([Module],[Module])
946 pruneHomePackageTable hpt summ (stable_obj, stable_bco)
947 = mapModuleEnv prune hpt
949 | is_stable modl = hmi'
950 | otherwise = hmi'{ hm_details = emptyModDetails }
952 modl = mi_module (hm_iface hmi)
953 hmi' | Just l <- hm_linkable hmi, linkableTime l < ms_hs_date ms
954 = hmi{ hm_linkable = Nothing }
957 where ms = expectJust "prune" (lookupModuleEnv ms_map modl)
959 ms_map = mkModuleEnv [(ms_mod ms, ms) | ms <- summ]
961 is_stable m = m `elem` stable_obj || m `elem` stable_bco
963 -- -----------------------------------------------------------------------------
965 -- Return (names of) all those in modsDone who are part of a cycle
966 -- as defined by theGraph.
967 findPartiallyCompletedCycles :: [Module] -> [SCC ModSummary] -> [Module]
968 findPartiallyCompletedCycles modsDone theGraph
972 chew ((AcyclicSCC v):rest) = chew rest -- acyclic? not interesting.
973 chew ((CyclicSCC vs):rest)
974 = let names_in_this_cycle = nub (map ms_mod vs)
976 = nub ([done | done <- modsDone,
977 done `elem` names_in_this_cycle])
978 chewed_rest = chew rest
980 if notNull mods_in_this_cycle
981 && length mods_in_this_cycle < length names_in_this_cycle
982 then mods_in_this_cycle ++ chewed_rest
985 -- -----------------------------------------------------------------------------
988 -- This is where we compile each module in the module graph, in a pass
989 -- from the bottom to the top of the graph.
991 -- There better had not be any cyclic groups here -- we check for them.
994 :: HscEnv -- Includes initially-empty HPT
995 -> HomePackageTable -- HPT from last time round (pruned)
996 -> ([Module],[Module]) -- stable modules (see checkStability)
997 -> IO () -- How to clean up unwanted tmp files
998 -> [SCC ModSummary] -- Mods to do (the worklist)
1000 HscEnv, -- With an updated HPT
1001 [ModSummary]) -- Mods which succeeded
1003 upsweep hsc_env old_hpt stable_mods cleanup mods
1004 = upsweep' hsc_env old_hpt stable_mods cleanup mods 1 (length mods)
1006 upsweep' hsc_env old_hpt stable_mods cleanup
1008 = return (Succeeded, hsc_env, [])
1010 upsweep' hsc_env old_hpt stable_mods cleanup
1011 (CyclicSCC ms:_) _ _
1012 = do fatalErrorMsg (hsc_dflags hsc_env) (cyclicModuleErr ms)
1013 return (Failed, hsc_env, [])
1015 upsweep' hsc_env old_hpt stable_mods cleanup
1016 (AcyclicSCC mod:mods) mod_index nmods
1017 = do -- putStrLn ("UPSWEEP_MOD: hpt = " ++
1018 -- show (map (moduleUserString.moduleName.mi_module.hm_iface)
1019 -- (moduleEnvElts (hsc_HPT hsc_env)))
1021 mb_mod_info <- upsweep_mod hsc_env old_hpt stable_mods mod
1024 cleanup -- Remove unwanted tmp files between compilations
1027 Nothing -> return (Failed, hsc_env, [])
1029 { let this_mod = ms_mod mod
1031 -- Add new info to hsc_env
1032 hpt1 = extendModuleEnv (hsc_HPT hsc_env)
1034 hsc_env1 = hsc_env { hsc_HPT = hpt1 }
1036 -- Space-saving: delete the old HPT entry
1037 -- for mod BUT if mod is a hs-boot
1038 -- node, don't delete it. For the
1039 -- interface, the HPT entry is probaby for the
1040 -- main Haskell source file. Deleting it
1041 -- would force .. (what?? --SDM)
1042 old_hpt1 | isBootSummary mod = old_hpt
1043 | otherwise = delModuleEnv old_hpt this_mod
1045 ; (restOK, hsc_env2, modOKs)
1046 <- upsweep' hsc_env1 old_hpt1 stable_mods cleanup
1047 mods (mod_index+1) nmods
1048 ; return (restOK, hsc_env2, mod:modOKs)
1052 -- Compile a single module. Always produce a Linkable for it if
1053 -- successful. If no compilation happened, return the old Linkable.
1054 upsweep_mod :: HscEnv
1056 -> ([Module],[Module])
1058 -> Int -- index of module
1059 -> Int -- total number of modules
1060 -> IO (Maybe HomeModInfo) -- Nothing => Failed
1062 upsweep_mod hsc_env old_hpt (stable_obj, stable_bco) summary mod_index nmods
1065 this_mod = ms_mod summary
1066 mb_obj_date = ms_obj_date summary
1067 obj_fn = ml_obj_file (ms_location summary)
1068 hs_date = ms_hs_date summary
1070 compile_it :: Maybe Linkable -> IO (Maybe HomeModInfo)
1071 compile_it = upsweep_compile hsc_env old_hpt this_mod
1072 summary mod_index nmods
1074 case ghcMode (hsc_dflags hsc_env) of
1077 -- Batch-compilating is easy: just check whether we have
1078 -- an up-to-date object file. If we do, then the compiler
1079 -- needs to do a recompilation check.
1080 _ | Just obj_date <- mb_obj_date, obj_date >= hs_date -> do
1082 findObjectLinkable this_mod obj_fn obj_date
1083 compile_it (Just linkable)
1090 _ | is_stable_obj, isJust old_hmi ->
1092 -- object is stable, and we have an entry in the
1093 -- old HPT: nothing to do
1095 | is_stable_obj, isNothing old_hmi -> do
1097 findObjectLinkable this_mod obj_fn
1098 (expectJust "upseep1" mb_obj_date)
1099 compile_it (Just linkable)
1100 -- object is stable, but we need to load the interface
1101 -- off disk to make a HMI.
1104 ASSERT(isJust old_hmi) -- must be in the old_hpt
1106 -- BCO is stable: nothing to do
1108 | Just hmi <- old_hmi,
1109 Just l <- hm_linkable hmi, not (isObjectLinkable l),
1110 linkableTime l >= ms_hs_date summary ->
1112 -- we have an old BCO that is up to date with respect
1113 -- to the source: do a recompilation check as normal.
1117 -- no existing code at all: we must recompile.
1119 is_stable_obj = this_mod `elem` stable_obj
1120 is_stable_bco = this_mod `elem` stable_bco
1122 old_hmi = lookupModuleEnv old_hpt this_mod
1124 -- Run hsc to compile a module
1125 upsweep_compile hsc_env old_hpt this_mod summary
1127 mb_old_linkable = do
1129 -- The old interface is ok if it's in the old HPT
1130 -- a) we're compiling a source file, and the old HPT
1131 -- entry is for a source file
1132 -- b) we're compiling a hs-boot file
1133 -- Case (b) allows an hs-boot file to get the interface of its
1134 -- real source file on the second iteration of the compilation
1135 -- manager, but that does no harm. Otherwise the hs-boot file
1136 -- will always be recompiled
1139 = case lookupModuleEnv old_hpt this_mod of
1141 Just hm_info | isBootSummary summary -> Just iface
1142 | not (mi_boot iface) -> Just iface
1143 | otherwise -> Nothing
1145 iface = hm_iface hm_info
1147 compresult <- compile hsc_env summary mb_old_linkable mb_old_iface
1151 -- Compilation failed. Compile may still have updated the PCS, tho.
1152 CompErrs -> return Nothing
1154 -- Compilation "succeeded", and may or may not have returned a new
1155 -- linkable (depending on whether compilation was actually performed
1157 CompOK new_details new_iface new_linkable
1158 -> do let new_info = HomeModInfo { hm_iface = new_iface,
1159 hm_details = new_details,
1160 hm_linkable = new_linkable }
1161 return (Just new_info)
1164 -- Filter modules in the HPT
1165 retainInTopLevelEnvs :: [Module] -> HomePackageTable -> HomePackageTable
1166 retainInTopLevelEnvs keep_these hpt
1167 = mkModuleEnv [ (mod, expectJust "retain" mb_mod_info)
1169 , let mb_mod_info = lookupModuleEnv hpt mod
1170 , isJust mb_mod_info ]
1172 -- ---------------------------------------------------------------------------
1173 -- Topological sort of the module graph
1176 :: Bool -- Drop hi-boot nodes? (see below)
1180 -- Calculate SCCs of the module graph, possibly dropping the hi-boot nodes
1181 -- The resulting list of strongly-connected-components is in topologically
1182 -- sorted order, starting with the module(s) at the bottom of the
1183 -- dependency graph (ie compile them first) and ending with the ones at
1186 -- Drop hi-boot nodes (first boolean arg)?
1188 -- False: treat the hi-boot summaries as nodes of the graph,
1189 -- so the graph must be acyclic
1191 -- True: eliminate the hi-boot nodes, and instead pretend
1192 -- the a source-import of Foo is an import of Foo
1193 -- The resulting graph has no hi-boot nodes, but can by cyclic
1195 topSortModuleGraph drop_hs_boot_nodes summaries Nothing
1196 = stronglyConnComp (fst (moduleGraphNodes drop_hs_boot_nodes summaries))
1197 topSortModuleGraph drop_hs_boot_nodes summaries (Just mod)
1198 = stronglyConnComp (map vertex_fn (reachable graph root))
1200 -- restrict the graph to just those modules reachable from
1201 -- the specified module. We do this by building a graph with
1202 -- the full set of nodes, and determining the reachable set from
1203 -- the specified node.
1204 (nodes, lookup_key) = moduleGraphNodes drop_hs_boot_nodes summaries
1205 (graph, vertex_fn, key_fn) = graphFromEdges' nodes
1207 | Just key <- lookup_key HsSrcFile mod, Just v <- key_fn key = v
1208 | otherwise = throwDyn (ProgramError "module does not exist")
1210 moduleGraphNodes :: Bool -> [ModSummary]
1211 -> ([(ModSummary, Int, [Int])], HscSource -> Module -> Maybe Int)
1212 moduleGraphNodes drop_hs_boot_nodes summaries = (nodes, lookup_key)
1214 -- Drop hs-boot nodes by using HsSrcFile as the key
1215 hs_boot_key | drop_hs_boot_nodes = HsSrcFile
1216 | otherwise = HsBootFile
1218 -- We use integers as the keys for the SCC algorithm
1219 nodes :: [(ModSummary, Int, [Int])]
1220 nodes = [(s, expectJust "topSort" (lookup_key (ms_hsc_src s) (ms_mod s)),
1221 out_edge_keys hs_boot_key (map unLoc (ms_srcimps s)) ++
1222 out_edge_keys HsSrcFile (map unLoc (ms_imps s)) )
1224 , not (isBootSummary s && drop_hs_boot_nodes) ]
1225 -- Drop the hi-boot ones if told to do so
1227 key_map :: NodeMap Int
1228 key_map = listToFM ([(ms_mod s, ms_hsc_src s) | s <- summaries]
1231 lookup_key :: HscSource -> Module -> Maybe Int
1232 lookup_key hs_src mod = lookupFM key_map (mod, hs_src)
1234 out_edge_keys :: HscSource -> [Module] -> [Int]
1235 out_edge_keys hi_boot ms = mapCatMaybes (lookup_key hi_boot) ms
1236 -- If we want keep_hi_boot_nodes, then we do lookup_key with
1237 -- the IsBootInterface parameter True; else False
1240 type NodeKey = (Module, HscSource) -- The nodes of the graph are
1241 type NodeMap a = FiniteMap NodeKey a -- keyed by (mod, src_file_type) pairs
1243 msKey :: ModSummary -> NodeKey
1244 msKey (ModSummary { ms_mod = mod, ms_hsc_src = boot }) = (mod,boot)
1246 mkNodeMap :: [ModSummary] -> NodeMap ModSummary
1247 mkNodeMap summaries = listToFM [ (msKey s, s) | s <- summaries]
1249 nodeMapElts :: NodeMap a -> [a]
1250 nodeMapElts = eltsFM
1252 -----------------------------------------------------------------------------
1253 -- Downsweep (dependency analysis)
1255 -- Chase downwards from the specified root set, returning summaries
1256 -- for all home modules encountered. Only follow source-import
1259 -- We pass in the previous collection of summaries, which is used as a
1260 -- cache to avoid recalculating a module summary if the source is
1263 -- The returned list of [ModSummary] nodes has one node for each home-package
1264 -- module, plus one for any hs-boot files. The imports of these nodes
1265 -- are all there, including the imports of non-home-package modules.
1268 -> [ModSummary] -- Old summaries
1269 -> [Module] -- Ignore dependencies on these; treat
1270 -- them as if they were package modules
1271 -> Bool -- True <=> allow multiple targets to have
1272 -- the same module name; this is
1273 -- very useful for ghc -M
1274 -> IO (Maybe [ModSummary])
1275 -- The elts of [ModSummary] all have distinct
1276 -- (Modules, IsBoot) identifiers, unless the Bool is true
1277 -- in which case there can be repeats
1278 downsweep hsc_env old_summaries excl_mods allow_dup_roots
1279 = -- catch error messages and return them
1280 handleDyn (\err_msg -> printBagOfErrors (hsc_dflags hsc_env) (unitBag err_msg) >> return Nothing) $ do
1281 rootSummaries <- mapM getRootSummary roots
1282 let root_map = mkRootMap rootSummaries
1283 checkDuplicates root_map
1284 summs <- loop (concatMap msDeps rootSummaries) root_map
1287 roots = hsc_targets hsc_env
1289 old_summary_map :: NodeMap ModSummary
1290 old_summary_map = mkNodeMap old_summaries
1292 getRootSummary :: Target -> IO ModSummary
1293 getRootSummary (Target (TargetFile file mb_phase) maybe_buf)
1294 = do exists <- doesFileExist file
1296 then summariseFile hsc_env old_summaries file mb_phase maybe_buf
1297 else throwDyn $ mkPlainErrMsg noSrcSpan $
1298 text "can't find file:" <+> text file
1299 getRootSummary (Target (TargetModule modl) maybe_buf)
1300 = do maybe_summary <- summariseModule hsc_env old_summary_map False
1301 (L rootLoc modl) maybe_buf excl_mods
1302 case maybe_summary of
1303 Nothing -> packageModErr modl
1306 rootLoc = mkGeneralSrcSpan FSLIT("<command line>")
1308 -- In a root module, the filename is allowed to diverge from the module
1309 -- name, so we have to check that there aren't multiple root files
1310 -- defining the same module (otherwise the duplicates will be silently
1311 -- ignored, leading to confusing behaviour).
1312 checkDuplicates :: NodeMap [ModSummary] -> IO ()
1313 checkDuplicates root_map
1314 | allow_dup_roots = return ()
1315 | null dup_roots = return ()
1316 | otherwise = multiRootsErr (head dup_roots)
1318 dup_roots :: [[ModSummary]] -- Each at least of length 2
1319 dup_roots = filterOut isSingleton (nodeMapElts root_map)
1321 loop :: [(Located Module,IsBootInterface)]
1322 -- Work list: process these modules
1323 -> NodeMap [ModSummary]
1324 -- Visited set; the range is a list because
1325 -- the roots can have the same module names
1326 -- if allow_dup_roots is True
1328 -- The result includes the worklist, except
1329 -- for those mentioned in the visited set
1330 loop [] done = return (concat (nodeMapElts done))
1331 loop ((wanted_mod, is_boot) : ss) done
1332 | Just summs <- lookupFM done key
1333 = if isSingleton summs then
1336 do { multiRootsErr summs; return [] }
1337 | otherwise = do { mb_s <- summariseModule hsc_env old_summary_map
1338 is_boot wanted_mod Nothing excl_mods
1340 Nothing -> loop ss done
1341 Just s -> loop (msDeps s ++ ss)
1342 (addToFM done key [s]) }
1344 key = (unLoc wanted_mod, if is_boot then HsBootFile else HsSrcFile)
1346 mkRootMap :: [ModSummary] -> NodeMap [ModSummary]
1347 mkRootMap summaries = addListToFM_C (++) emptyFM
1348 [ (msKey s, [s]) | s <- summaries ]
1350 msDeps :: ModSummary -> [(Located Module, IsBootInterface)]
1351 -- (msDeps s) returns the dependencies of the ModSummary s.
1352 -- A wrinkle is that for a {-# SOURCE #-} import we return
1353 -- *both* the hs-boot file
1354 -- *and* the source file
1355 -- as "dependencies". That ensures that the list of all relevant
1356 -- modules always contains B.hs if it contains B.hs-boot.
1357 -- Remember, this pass isn't doing the topological sort. It's
1358 -- just gathering the list of all relevant ModSummaries
1360 concat [ [(m,True), (m,False)] | m <- ms_srcimps s ]
1361 ++ [ (m,False) | m <- ms_imps s ]
1363 -----------------------------------------------------------------------------
1364 -- Summarising modules
1366 -- We have two types of summarisation:
1368 -- * Summarise a file. This is used for the root module(s) passed to
1369 -- cmLoadModules. The file is read, and used to determine the root
1370 -- module name. The module name may differ from the filename.
1372 -- * Summarise a module. We are given a module name, and must provide
1373 -- a summary. The finder is used to locate the file in which the module
1378 -> [ModSummary] -- old summaries
1379 -> FilePath -- source file name
1380 -> Maybe Phase -- start phase
1381 -> Maybe (StringBuffer,ClockTime)
1384 summariseFile hsc_env old_summaries file mb_phase maybe_buf
1385 -- we can use a cached summary if one is available and the
1386 -- source file hasn't changed, But we have to look up the summary
1387 -- by source file, rather than module name as we do in summarise.
1388 | Just old_summary <- findSummaryBySourceFile old_summaries file
1390 let location = ms_location old_summary
1392 -- return the cached summary if the source didn't change
1393 src_timestamp <- case maybe_buf of
1394 Just (_,t) -> return t
1395 Nothing -> getModificationTime file
1396 -- The file exists; we checked in getRootSummary above.
1397 -- If it gets removed subsequently, then this
1398 -- getModificationTime may fail, but that's the right
1401 if ms_hs_date old_summary == src_timestamp
1402 then do -- update the object-file timestamp
1403 obj_timestamp <- getObjTimestamp location False
1404 return old_summary{ ms_obj_date = obj_timestamp }
1412 let dflags = hsc_dflags hsc_env
1414 (dflags', hspp_fn, buf)
1415 <- preprocessFile dflags file mb_phase maybe_buf
1417 (srcimps,the_imps, L _ mod) <- getImports dflags' buf hspp_fn
1419 -- Make a ModLocation for this file
1420 location <- mkHomeModLocation dflags mod file
1422 -- Tell the Finder cache where it is, so that subsequent calls
1423 -- to findModule will find it, even if it's not on any search path
1424 addHomeModuleToFinder hsc_env mod location
1426 src_timestamp <- case maybe_buf of
1427 Just (_,t) -> return t
1428 Nothing -> getModificationTime file
1429 -- getMofificationTime may fail
1431 obj_timestamp <- modificationTimeIfExists (ml_obj_file location)
1433 return (ModSummary { ms_mod = mod, ms_hsc_src = HsSrcFile,
1434 ms_location = location,
1435 ms_hspp_file = Just hspp_fn,
1436 ms_hspp_buf = Just buf,
1437 ms_srcimps = srcimps, ms_imps = the_imps,
1438 ms_hs_date = src_timestamp,
1439 ms_obj_date = obj_timestamp })
1441 findSummaryBySourceFile :: [ModSummary] -> FilePath -> Maybe ModSummary
1442 findSummaryBySourceFile summaries file
1443 = case [ ms | ms <- summaries, HsSrcFile <- [ms_hsc_src ms],
1444 fromJust (ml_hs_file (ms_location ms)) == file ] of
1448 -- Summarise a module, and pick up source and timestamp.
1451 -> NodeMap ModSummary -- Map of old summaries
1452 -> IsBootInterface -- True <=> a {-# SOURCE #-} import
1453 -> Located Module -- Imported module to be summarised
1454 -> Maybe (StringBuffer, ClockTime)
1455 -> [Module] -- Modules to exclude
1456 -> IO (Maybe ModSummary) -- Its new summary
1458 summariseModule hsc_env old_summary_map is_boot (L loc wanted_mod) maybe_buf excl_mods
1459 | wanted_mod `elem` excl_mods
1462 | Just old_summary <- lookupFM old_summary_map (wanted_mod, hsc_src)
1463 = do -- Find its new timestamp; all the
1464 -- ModSummaries in the old map have valid ml_hs_files
1465 let location = ms_location old_summary
1466 src_fn = expectJust "summariseModule" (ml_hs_file location)
1468 -- check the modification time on the source file, and
1469 -- return the cached summary if it hasn't changed. If the
1470 -- file has disappeared, we need to call the Finder again.
1472 Just (_,t) -> check_timestamp old_summary location src_fn t
1474 m <- System.IO.Error.try (getModificationTime src_fn)
1476 Right t -> check_timestamp old_summary location src_fn t
1477 Left e | isDoesNotExistError e -> find_it
1478 | otherwise -> ioError e
1480 | otherwise = find_it
1482 dflags = hsc_dflags hsc_env
1484 hsc_src = if is_boot then HsBootFile else HsSrcFile
1486 check_timestamp old_summary location src_fn src_timestamp
1487 | ms_hs_date old_summary == src_timestamp = do
1488 -- update the object-file timestamp
1489 obj_timestamp <- getObjTimestamp location is_boot
1490 return (Just old_summary{ ms_obj_date = obj_timestamp })
1492 -- source changed: find and re-summarise. We call the finder
1493 -- again, because the user may have moved the source file.
1494 new_summary location src_fn src_timestamp
1497 -- Don't use the Finder's cache this time. If the module was
1498 -- previously a package module, it may have now appeared on the
1499 -- search path, so we want to consider it to be a home module. If
1500 -- the module was previously a home module, it may have moved.
1501 uncacheModule hsc_env wanted_mod
1502 found <- findModule hsc_env wanted_mod True {-explicit-}
1505 | not (isHomePackage pkg) -> return Nothing
1506 -- Drop external-pkg
1507 | isJust (ml_hs_file location) -> just_found location
1509 err -> noModError dflags loc wanted_mod err
1512 just_found location = do
1513 -- Adjust location to point to the hs-boot source file,
1514 -- hi file, object file, when is_boot says so
1515 let location' | is_boot = addBootSuffixLocn location
1516 | otherwise = location
1517 src_fn = expectJust "summarise2" (ml_hs_file location')
1519 -- Check that it exists
1520 -- It might have been deleted since the Finder last found it
1521 maybe_t <- modificationTimeIfExists src_fn
1523 Nothing -> noHsFileErr loc src_fn
1524 Just t -> new_summary location' src_fn t
1527 new_summary location src_fn src_timestamp
1529 -- Preprocess the source file and get its imports
1530 -- The dflags' contains the OPTIONS pragmas
1531 (dflags', hspp_fn, buf) <- preprocessFile dflags src_fn Nothing maybe_buf
1532 (srcimps, the_imps, L mod_loc mod_name) <- getImports dflags' buf hspp_fn
1534 when (mod_name /= wanted_mod) $
1535 throwDyn $ mkPlainErrMsg mod_loc $
1536 text "file name does not match module name"
1537 <+> quotes (ppr mod_name)
1539 -- Find the object timestamp, and return the summary
1540 obj_timestamp <- getObjTimestamp location is_boot
1542 return (Just ( ModSummary { ms_mod = wanted_mod,
1543 ms_hsc_src = hsc_src,
1544 ms_location = location,
1545 ms_hspp_file = Just hspp_fn,
1546 ms_hspp_buf = Just buf,
1547 ms_srcimps = srcimps,
1549 ms_hs_date = src_timestamp,
1550 ms_obj_date = obj_timestamp }))
1553 getObjTimestamp location is_boot
1554 = if is_boot then return Nothing
1555 else modificationTimeIfExists (ml_obj_file location)
1558 preprocessFile :: DynFlags -> FilePath -> Maybe Phase -> Maybe (StringBuffer,ClockTime)
1559 -> IO (DynFlags, FilePath, StringBuffer)
1560 preprocessFile dflags src_fn mb_phase Nothing
1562 (dflags', hspp_fn) <- preprocess dflags (src_fn, mb_phase)
1563 buf <- hGetStringBuffer hspp_fn
1564 return (dflags', hspp_fn, buf)
1566 preprocessFile dflags src_fn mb_phase (Just (buf, time))
1568 -- case we bypass the preprocessing stage?
1570 local_opts = getOptionsFromStringBuffer buf src_fn
1572 (dflags', errs) <- parseDynamicFlags dflags (map snd local_opts)
1576 | Just (Unlit _) <- mb_phase = True
1577 | Nothing <- mb_phase, Unlit _ <- startPhase src_fn = True
1578 -- note: local_opts is only required if there's no Unlit phase
1579 | dopt Opt_Cpp dflags' = True
1580 | dopt Opt_Pp dflags' = True
1583 when needs_preprocessing $
1584 ghcError (ProgramError "buffer needs preprocesing; interactive check disabled")
1586 return (dflags', src_fn, buf)
1589 -----------------------------------------------------------------------------
1591 -----------------------------------------------------------------------------
1593 noModError :: DynFlags -> SrcSpan -> Module -> FindResult -> IO ab
1594 -- ToDo: we don't have a proper line number for this error
1595 noModError dflags loc wanted_mod err
1596 = throwDyn $ mkPlainErrMsg loc $ cantFindError dflags wanted_mod err
1598 noHsFileErr loc path
1599 = throwDyn $ mkPlainErrMsg loc $ text "Can't find" <+> text path
1602 = throwDyn $ mkPlainErrMsg noSrcSpan $
1603 text "module" <+> quotes (ppr mod) <+> text "is a package module"
1605 multiRootsErr :: [ModSummary] -> IO ()
1606 multiRootsErr summs@(summ1:_)
1607 = throwDyn $ mkPlainErrMsg noSrcSpan $
1608 text "module" <+> quotes (ppr mod) <+>
1609 text "is defined in multiple files:" <+>
1610 sep (map text files)
1613 files = map (expectJust "checkDup" . ml_hs_file . ms_location) summs
1615 cyclicModuleErr :: [ModSummary] -> SDoc
1617 = hang (ptext SLIT("Module imports form a cycle for modules:"))
1618 2 (vcat (map show_one ms))
1620 show_one ms = sep [ show_mod (ms_hsc_src ms) (ms_mod ms),
1621 nest 2 $ ptext SLIT("imports:") <+>
1622 (pp_imps HsBootFile (ms_srcimps ms)
1623 $$ pp_imps HsSrcFile (ms_imps ms))]
1624 show_mod hsc_src mod = ppr mod <> text (hscSourceString hsc_src)
1625 pp_imps src mods = fsep (map (show_mod src) mods)
1628 -- | Inform GHC that the working directory has changed. GHC will flush
1629 -- its cache of module locations, since it may no longer be valid.
1630 -- Note: if you change the working directory, you should also unload
1631 -- the current program (set targets to empty, followed by load).
1632 workingDirectoryChanged :: Session -> IO ()
1633 workingDirectoryChanged s = withSession s $ \hsc_env ->
1634 flushFinderCache (hsc_FC hsc_env)
1636 -- -----------------------------------------------------------------------------
1637 -- inspecting the session
1639 -- | Get the module dependency graph.
1640 getModuleGraph :: Session -> IO ModuleGraph -- ToDo: DiGraph ModSummary
1641 getModuleGraph s = withSession s (return . hsc_mod_graph)
1643 isLoaded :: Session -> Module -> IO Bool
1644 isLoaded s m = withSession s $ \hsc_env ->
1645 return $! isJust (lookupModuleEnv (hsc_HPT hsc_env) m)
1647 getBindings :: Session -> IO [TyThing]
1648 getBindings s = withSession s (return . nameEnvElts . ic_type_env . hsc_IC)
1650 getPrintUnqual :: Session -> IO PrintUnqualified
1651 getPrintUnqual s = withSession s (return . icPrintUnqual . hsc_IC)
1653 -- | Container for information about a 'Module'.
1654 data ModuleInfo = ModuleInfo {
1655 minf_type_env :: TypeEnv,
1656 minf_exports :: NameSet,
1657 minf_rdr_env :: Maybe GlobalRdrEnv, -- Nothing for a compiled/package mod
1658 minf_instances :: [Instance]
1659 -- ToDo: this should really contain the ModIface too
1661 -- We don't want HomeModInfo here, because a ModuleInfo applies
1662 -- to package modules too.
1664 -- | Request information about a loaded 'Module'
1665 getModuleInfo :: Session -> Module -> IO (Maybe ModuleInfo)
1666 getModuleInfo s mdl = withSession s $ \hsc_env -> do
1667 let mg = hsc_mod_graph hsc_env
1668 if mdl `elem` map ms_mod mg
1669 then getHomeModuleInfo hsc_env mdl
1671 {- if isHomeModule (hsc_dflags hsc_env) mdl
1673 else -} getPackageModuleInfo hsc_env mdl
1674 -- getPackageModuleInfo will attempt to find the interface, so
1675 -- we don't want to call it for a home module, just in case there
1676 -- was a problem loading the module and the interface doesn't
1677 -- exist... hence the isHomeModule test here. (ToDo: reinstate)
1679 getPackageModuleInfo :: HscEnv -> Module -> IO (Maybe ModuleInfo)
1680 getPackageModuleInfo hsc_env mdl = do
1682 (_msgs, mb_names) <- getModuleExports hsc_env mdl
1684 Nothing -> return Nothing
1686 eps <- readIORef (hsc_EPS hsc_env)
1689 n_list = nameSetToList names
1690 tys = [ ty | name <- n_list,
1691 Just ty <- [lookupTypeEnv pte name] ]
1693 return (Just (ModuleInfo {
1694 minf_type_env = mkTypeEnv tys,
1695 minf_exports = names,
1696 minf_rdr_env = Just $! nameSetToGlobalRdrEnv names mdl,
1697 minf_instances = error "getModuleInfo: instances for package module unimplemented"
1700 -- bogusly different for non-GHCI (ToDo)
1704 getHomeModuleInfo hsc_env mdl =
1705 case lookupModuleEnv (hsc_HPT hsc_env) mdl of
1706 Nothing -> return Nothing
1708 let details = hm_details hmi
1709 return (Just (ModuleInfo {
1710 minf_type_env = md_types details,
1711 minf_exports = md_exports details,
1712 minf_rdr_env = mi_globals $! hm_iface hmi,
1713 minf_instances = md_insts details
1716 -- | The list of top-level entities defined in a module
1717 modInfoTyThings :: ModuleInfo -> [TyThing]
1718 modInfoTyThings minf = typeEnvElts (minf_type_env minf)
1720 modInfoTopLevelScope :: ModuleInfo -> Maybe [Name]
1721 modInfoTopLevelScope minf
1722 = fmap (map gre_name . globalRdrEnvElts) (minf_rdr_env minf)
1724 modInfoExports :: ModuleInfo -> [Name]
1725 modInfoExports minf = nameSetToList $! minf_exports minf
1727 -- | Returns the instances defined by the specified module.
1728 -- Warning: currently unimplemented for package modules.
1729 modInfoInstances :: ModuleInfo -> [Instance]
1730 modInfoInstances = minf_instances
1732 modInfoIsExportedName :: ModuleInfo -> Name -> Bool
1733 modInfoIsExportedName minf name = elemNameSet name (minf_exports minf)
1735 modInfoPrintUnqualified :: ModuleInfo -> Maybe PrintUnqualified
1736 modInfoPrintUnqualified minf = fmap unQualInScope (minf_rdr_env minf)
1738 modInfoLookupName :: Session -> ModuleInfo -> Name -> IO (Maybe TyThing)
1739 modInfoLookupName s minf name = withSession s $ \hsc_env -> do
1740 case lookupTypeEnv (minf_type_env minf) name of
1741 Just tyThing -> return (Just tyThing)
1743 eps <- readIORef (hsc_EPS hsc_env)
1744 return $! lookupType (hsc_HPT hsc_env) (eps_PTE eps) name
1746 isDictonaryId :: Id -> Bool
1748 = case tcSplitSigmaTy (idType id) of { (tvs, theta, tau) -> isDictTy tau }
1750 -- | Looks up a global name: that is, any top-level name in any
1751 -- visible module. Unlike 'lookupName', lookupGlobalName does not use
1752 -- the interactive context, and therefore does not require a preceding
1754 lookupGlobalName :: Session -> Name -> IO (Maybe TyThing)
1755 lookupGlobalName s name = withSession s $ \hsc_env -> do
1756 eps <- readIORef (hsc_EPS hsc_env)
1757 return $! lookupType (hsc_HPT hsc_env) (eps_PTE eps) name
1759 -- -----------------------------------------------------------------------------
1760 -- Misc exported utils
1762 dataConType :: DataCon -> Type
1763 dataConType dc = idType (dataConWrapId dc)
1765 -- | print a 'NamedThing', adding parentheses if the name is an operator.
1766 pprParenSymName :: NamedThing a => a -> SDoc
1767 pprParenSymName a = parenSymOcc (getOccName a) (ppr (getName a))
1769 -- ----------------------------------------------------------------------------
1774 -- - Data and Typeable instances for HsSyn.
1776 -- ToDo: check for small transformations that happen to the syntax in
1777 -- the typechecker (eg. -e ==> negate e, perhaps for fromIntegral)
1779 -- ToDo: maybe use TH syntax instead of IfaceSyn? There's already a way
1780 -- to get from TyCons, Ids etc. to TH syntax (reify).
1782 -- :browse will use either lm_toplev or inspect lm_interface, depending
1783 -- on whether the module is interpreted or not.
1785 -- This is for reconstructing refactored source code
1786 -- Calls the lexer repeatedly.
1787 -- ToDo: add comment tokens to token stream
1788 getTokenStream :: Session -> Module -> IO [Located Token]
1791 -- -----------------------------------------------------------------------------
1792 -- Interactive evaluation
1796 -- | Set the interactive evaluation context.
1798 -- Setting the context doesn't throw away any bindings; the bindings
1799 -- we've built up in the InteractiveContext simply move to the new
1800 -- module. They always shadow anything in scope in the current context.
1801 setContext :: Session
1802 -> [Module] -- entire top level scope of these modules
1803 -> [Module] -- exports only of these modules
1805 setContext (Session ref) toplevs exports = do
1806 hsc_env <- readIORef ref
1807 let old_ic = hsc_IC hsc_env
1808 hpt = hsc_HPT hsc_env
1810 mapM_ (checkModuleExists hsc_env hpt) exports
1811 export_env <- mkExportEnv hsc_env exports
1812 toplev_envs <- mapM (mkTopLevEnv hpt) toplevs
1813 let all_env = foldr plusGlobalRdrEnv export_env toplev_envs
1814 writeIORef ref hsc_env{ hsc_IC = old_ic { ic_toplev_scope = toplevs,
1815 ic_exports = exports,
1816 ic_rn_gbl_env = all_env }}
1819 -- Make a GlobalRdrEnv based on the exports of the modules only.
1820 mkExportEnv :: HscEnv -> [Module] -> IO GlobalRdrEnv
1821 mkExportEnv hsc_env mods = do
1822 stuff <- mapM (getModuleExports hsc_env) mods
1824 (_msgs, mb_name_sets) = unzip stuff
1825 gres = [ nameSetToGlobalRdrEnv name_set mod
1826 | (Just name_set, mod) <- zip mb_name_sets mods ]
1828 return $! foldr plusGlobalRdrEnv emptyGlobalRdrEnv gres
1830 nameSetToGlobalRdrEnv :: NameSet -> Module -> GlobalRdrEnv
1831 nameSetToGlobalRdrEnv names mod =
1832 mkGlobalRdrEnv [ GRE { gre_name = name, gre_prov = vanillaProv mod }
1833 | name <- nameSetToList names ]
1835 vanillaProv :: Module -> Provenance
1836 -- We're building a GlobalRdrEnv as if the user imported
1837 -- all the specified modules into the global interactive module
1838 vanillaProv mod = Imported [ImpSpec { is_decl = decl, is_item = ImpAll}]
1840 decl = ImpDeclSpec { is_mod = mod, is_as = mod,
1842 is_dloc = srcLocSpan interactiveSrcLoc }
1844 checkModuleExists :: HscEnv -> HomePackageTable -> Module -> IO ()
1845 checkModuleExists hsc_env hpt mod =
1846 case lookupModuleEnv hpt mod of
1847 Just mod_info -> return ()
1848 _not_a_home_module -> do
1849 res <- findPackageModule hsc_env mod True
1851 Found _ _ -> return ()
1852 err -> let msg = cantFindError (hsc_dflags hsc_env) mod err in
1853 throwDyn (CmdLineError (showSDoc msg))
1855 mkTopLevEnv :: HomePackageTable -> Module -> IO GlobalRdrEnv
1856 mkTopLevEnv hpt modl
1857 = case lookupModuleEnv hpt modl of
1859 throwDyn (ProgramError ("mkTopLevEnv: not a home module "
1860 ++ showSDoc (pprModule modl)))
1862 case mi_globals (hm_iface details) of
1864 throwDyn (ProgramError ("mkTopLevEnv: not interpreted "
1865 ++ showSDoc (pprModule modl)))
1866 Just env -> return env
1868 -- | Get the interactive evaluation context, consisting of a pair of the
1869 -- set of modules from which we take the full top-level scope, and the set
1870 -- of modules from which we take just the exports respectively.
1871 getContext :: Session -> IO ([Module],[Module])
1872 getContext s = withSession s (\HscEnv{ hsc_IC=ic } ->
1873 return (ic_toplev_scope ic, ic_exports ic))
1875 -- | Returns 'True' if the specified module is interpreted, and hence has
1876 -- its full top-level scope available.
1877 moduleIsInterpreted :: Session -> Module -> IO Bool
1878 moduleIsInterpreted s modl = withSession s $ \h ->
1879 case lookupModuleEnv (hsc_HPT h) modl of
1880 Just details -> return (isJust (mi_globals (hm_iface details)))
1881 _not_a_home_module -> return False
1883 -- | Looks up an identifier in the current interactive context (for :info)
1884 getInfo :: Session -> Name -> IO (Maybe (TyThing,Fixity,[Instance]))
1885 getInfo s name = withSession s $ \hsc_env -> tcRnGetInfo hsc_env name
1887 -- | Returns all names in scope in the current interactive context
1888 getNamesInScope :: Session -> IO [Name]
1889 getNamesInScope s = withSession s $ \hsc_env -> do
1890 return (map gre_name (globalRdrEnvElts (ic_rn_gbl_env (hsc_IC hsc_env))))
1892 getRdrNamesInScope :: Session -> IO [RdrName]
1893 getRdrNamesInScope s = withSession s $ \hsc_env -> do
1894 let env = ic_rn_gbl_env (hsc_IC hsc_env)
1895 return (concat (map greToRdrNames (globalRdrEnvElts env)))
1897 -- ToDo: move to RdrName
1898 greToRdrNames :: GlobalRdrElt -> [RdrName]
1899 greToRdrNames GRE{ gre_name = name, gre_prov = prov }
1901 LocalDef -> [unqual]
1902 Imported specs -> concat (map do_spec (map is_decl specs))
1904 occ = nameOccName name
1907 | is_qual decl_spec = [qual]
1908 | otherwise = [unqual,qual]
1909 where qual = Qual (is_as decl_spec) occ
1911 -- | Parses a string as an identifier, and returns the list of 'Name's that
1912 -- the identifier can refer to in the current interactive context.
1913 parseName :: Session -> String -> IO [Name]
1914 parseName s str = withSession s $ \hsc_env -> do
1915 maybe_rdr_name <- hscParseIdentifier (hsc_dflags hsc_env) str
1916 case maybe_rdr_name of
1917 Nothing -> return []
1918 Just (L _ rdr_name) -> do
1919 mb_names <- tcRnLookupRdrName hsc_env rdr_name
1921 Nothing -> return []
1922 Just ns -> return ns
1923 -- ToDo: should return error messages
1925 -- | Returns the 'TyThing' for a 'Name'. The 'Name' may refer to any
1926 -- entity known to GHC, including 'Name's defined using 'runStmt'.
1927 lookupName :: Session -> Name -> IO (Maybe TyThing)
1928 lookupName s name = withSession s $ \hsc_env -> tcRnLookupName hsc_env name
1930 -- -----------------------------------------------------------------------------
1931 -- Getting the type of an expression
1933 -- | Get the type of an expression
1934 exprType :: Session -> String -> IO (Maybe Type)
1935 exprType s expr = withSession s $ \hsc_env -> do
1936 maybe_stuff <- hscTcExpr hsc_env expr
1938 Nothing -> return Nothing
1939 Just ty -> return (Just tidy_ty)
1941 tidy_ty = tidyType emptyTidyEnv ty
1943 -- -----------------------------------------------------------------------------
1944 -- Getting the kind of a type
1946 -- | Get the kind of a type
1947 typeKind :: Session -> String -> IO (Maybe Kind)
1948 typeKind s str = withSession s $ \hsc_env -> do
1949 maybe_stuff <- hscKcType hsc_env str
1951 Nothing -> return Nothing
1952 Just kind -> return (Just kind)
1954 -----------------------------------------------------------------------------
1955 -- cmCompileExpr: compile an expression and deliver an HValue
1957 compileExpr :: Session -> String -> IO (Maybe HValue)
1958 compileExpr s expr = withSession s $ \hsc_env -> do
1959 maybe_stuff <- hscStmt hsc_env ("let __cmCompileExpr = "++expr)
1961 Nothing -> return Nothing
1962 Just (new_ic, names, hval) -> do
1964 hvals <- (unsafeCoerce# hval) :: IO [HValue]
1966 case (names,hvals) of
1967 ([n],[hv]) -> return (Just hv)
1968 _ -> panic "compileExpr"
1970 -- -----------------------------------------------------------------------------
1971 -- running a statement interactively
1974 = RunOk [Name] -- ^ names bound by this evaluation
1975 | RunFailed -- ^ statement failed compilation
1976 | RunException Exception -- ^ statement raised an exception
1978 -- | Run a statement in the current interactive context. Statemenet
1979 -- may bind multple values.
1980 runStmt :: Session -> String -> IO RunResult
1981 runStmt (Session ref) expr
1983 hsc_env <- readIORef ref
1985 -- Turn off -fwarn-unused-bindings when running a statement, to hide
1986 -- warnings about the implicit bindings we introduce.
1987 let dflags' = dopt_unset (hsc_dflags hsc_env) Opt_WarnUnusedBinds
1988 hsc_env' = hsc_env{ hsc_dflags = dflags' }
1990 maybe_stuff <- hscStmt hsc_env' expr
1993 Nothing -> return RunFailed
1994 Just (new_hsc_env, names, hval) -> do
1996 let thing_to_run = unsafeCoerce# hval :: IO [HValue]
1997 either_hvals <- sandboxIO thing_to_run
1999 case either_hvals of
2001 -- on error, keep the *old* interactive context,
2002 -- so that 'it' is not bound to something
2003 -- that doesn't exist.
2004 return (RunException e)
2007 -- Get the newly bound things, and bind them.
2008 -- Don't need to delete any shadowed bindings;
2009 -- the new ones override the old ones.
2010 extendLinkEnv (zip names hvals)
2012 writeIORef ref new_hsc_env
2013 return (RunOk names)
2015 -- When running a computation, we redirect ^C exceptions to the running
2016 -- thread. ToDo: we might want a way to continue even if the target
2017 -- thread doesn't die when it receives the exception... "this thread
2018 -- is not responding".
2019 sandboxIO :: IO a -> IO (Either Exception a)
2020 sandboxIO thing = do
2022 ts <- takeMVar interruptTargetThread
2023 child <- forkIO (do res <- Exception.try thing; putMVar m res)
2024 putMVar interruptTargetThread (child:ts)
2025 takeMVar m `finally` modifyMVar_ interruptTargetThread (return.tail)
2028 -- This version of sandboxIO runs the expression in a completely new
2029 -- RTS main thread. It is disabled for now because ^C exceptions
2030 -- won't be delivered to the new thread, instead they'll be delivered
2031 -- to the (blocked) GHCi main thread.
2033 -- SLPJ: when re-enabling this, reflect a wrong-stat error as an exception
2035 sandboxIO :: IO a -> IO (Either Int (Either Exception a))
2036 sandboxIO thing = do
2037 st_thing <- newStablePtr (Exception.try thing)
2038 alloca $ \ p_st_result -> do
2039 stat <- rts_evalStableIO st_thing p_st_result
2040 freeStablePtr st_thing
2042 then do st_result <- peek p_st_result
2043 result <- deRefStablePtr st_result
2044 freeStablePtr st_result
2045 return (Right result)
2047 return (Left (fromIntegral stat))
2049 foreign import "rts_evalStableIO" {- safe -}
2050 rts_evalStableIO :: StablePtr (IO a) -> Ptr (StablePtr a) -> IO CInt
2051 -- more informative than the C type!
2054 -----------------------------------------------------------------------------
2055 -- show a module and it's source/object filenames
2057 showModule :: Session -> ModSummary -> IO String
2058 showModule s mod_summary = withSession s $ \hsc_env -> do
2059 case lookupModuleEnv (hsc_HPT hsc_env) (ms_mod mod_summary) of
2060 Nothing -> panic "missing linkable"
2061 Just mod_info -> return (showModMsg obj_linkable mod_summary)
2063 obj_linkable = isObjectLinkable (fromJust (hm_linkable mod_info))