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,
77 -- * Abstract syntax elements
80 Module, mkModule, pprModule,
84 nameModule, nameParent_maybe, pprParenSymName, nameSrcLoc,
89 isImplicitId, isDeadBinder,
90 isExportedId, isLocalId, isGlobalId,
92 isPrimOpId, isFCallId, isClassOpId_maybe,
93 isDataConWorkId, idDataCon,
94 isBottomingId, isDictonaryId,
95 recordSelectorFieldLabel,
97 -- ** Type constructors
99 tyConTyVars, tyConDataCons, tyConArity,
100 isClassTyCon, isSynTyCon, isNewTyCon, isPrimTyCon, isFunTyCon,
107 -- ** Data constructors
109 dataConSig, dataConType, dataConTyCon, dataConFieldLabels,
110 dataConIsInfix, isVanillaDataCon,
112 StrictnessMark(..), isMarkedStrict,
116 classMethods, classSCTheta, classTvsFds,
121 instanceDFunId, pprInstance, pprInstanceHdr,
123 -- ** Types and Kinds
124 Type, dropForAlls, splitForAllTys, funResultTy, pprParendType,
127 ThetaType, pprThetaArrow,
133 module HsSyn, -- ToDo: remove extraneous bits
137 defaultFixity, maxPrecedence,
141 -- ** Source locations
145 GhcException(..), showGhcException,
155 * inline bits of HscMain here to simplify layering: hscTcExpr, hscStmt.
156 * we need to expose DynFlags, so should parseDynamicFlags really be
157 part of this interface?
158 * what StaticFlags should we expose, if any?
161 #include "HsVersions.h"
164 import qualified Linker
165 import Linker ( HValue, extendLinkEnv )
166 import TcRnDriver ( tcRnLookupRdrName, tcRnGetInfo,
167 tcRnLookupName, getModuleExports )
168 import RdrName ( plusGlobalRdrEnv, Provenance(..),
169 ImportSpec(..), ImpDeclSpec(..), ImpItemSpec(..),
170 emptyGlobalRdrEnv, mkGlobalRdrEnv )
171 import HscMain ( hscParseIdentifier, hscStmt, hscTcExpr, hscKcType )
172 import Type ( tidyType )
173 import VarEnv ( emptyTidyEnv )
174 import GHC.Exts ( unsafeCoerce# )
177 import Packages ( initPackages )
178 import NameSet ( NameSet, nameSetToList, elemNameSet )
179 import RdrName ( GlobalRdrEnv, GlobalRdrElt(..), RdrName,
182 import Type ( Kind, Type, dropForAlls, PredType, ThetaType,
183 pprThetaArrow, pprParendType, splitForAllTys,
185 import Id ( Id, idType, isImplicitId, isDeadBinder,
186 isExportedId, isLocalId, isGlobalId,
187 isRecordSelector, recordSelectorFieldLabel,
188 isPrimOpId, isFCallId, isClassOpId_maybe,
189 isDataConWorkId, idDataCon,
192 import TysPrim ( alphaTyVars )
193 import TyCon ( TyCon, isClassTyCon, isSynTyCon, isNewTyCon,
194 isPrimTyCon, isFunTyCon, tyConArity,
195 tyConTyVars, tyConDataCons, getSynTyConDefn )
196 import Class ( Class, classSCTheta, classTvsFds, classMethods )
197 import FunDeps ( pprFundeps )
198 import DataCon ( DataCon, dataConWrapId, dataConSig, dataConTyCon,
199 dataConFieldLabels, dataConStrictMarks,
200 dataConIsInfix, isVanillaDataCon )
201 import Name ( Name, nameModule, NamedThing(..), nameParent_maybe,
203 import OccName ( parenSymOcc )
204 import NameEnv ( nameEnvElts )
205 import InstEnv ( Instance, instanceDFunId, pprInstance, pprInstanceHdr )
207 import DriverPipeline
208 import DriverPhases ( Phase(..), isHaskellSrcFilename, startPhase )
209 import GetImports ( getImports )
210 import Packages ( isHomePackage )
212 import HscMain ( newHscEnv, hscFileCheck, HscResult(..) )
216 import SysTools ( initSysTools, cleanTempFiles )
221 import Bag ( unitBag )
222 import ErrUtils ( Severity(..), showPass, fatalErrorMsg, debugTraceMsg,
223 mkPlainErrMsg, printBagOfErrors, printErrorsAndWarnings )
224 import qualified ErrUtils
226 import StringBuffer ( StringBuffer, hGetStringBuffer )
228 import SysTools ( cleanTempFilesExcept )
230 import TcType ( tcSplitSigmaTy, isDictTy )
231 import Maybes ( expectJust, mapCatMaybes )
233 import Control.Concurrent
234 import System.Directory ( getModificationTime, doesFileExist )
235 import Data.Maybe ( isJust, isNothing, fromJust )
236 import Data.List ( partition, nub )
237 import qualified Data.List as List
238 import Control.Monad ( unless, when )
239 import System.Exit ( exitWith, ExitCode(..) )
240 import System.Time ( ClockTime )
241 import Control.Exception as Exception hiding (handle)
244 import System.IO.Error ( try, isDoesNotExistError )
245 import System.IO.Unsafe ( unsafePerformIO )
246 import Prelude hiding (init)
248 -- -----------------------------------------------------------------------------
249 -- Exception handlers
251 -- | Install some default exception handlers and run the inner computation.
252 -- Unless you want to handle exceptions yourself, you should wrap this around
253 -- the top level of your program. The default handlers output the error
254 -- message(s) to stderr and exit cleanly.
255 defaultErrorHandler :: DynFlags -> IO a -> IO a
256 defaultErrorHandler dflags inner =
257 -- top-level exception handler: any unrecognised exception is a compiler bug.
258 handle (\exception -> do
261 -- an IO exception probably isn't our fault, so don't panic
263 fatalErrorMsg dflags (text (show exception))
264 AsyncException StackOverflow ->
265 fatalErrorMsg dflags (text "stack overflow: use +RTS -K<size> to increase it")
267 fatalErrorMsg dflags (text (show (Panic (show exception))))
268 exitWith (ExitFailure 1)
271 -- program errors: messages with locations attached. Sometimes it is
272 -- convenient to just throw these as exceptions.
273 handleDyn (\dyn -> do printBagOfErrors dflags (unitBag dyn)
274 exitWith (ExitFailure 1)) $
276 -- error messages propagated as exceptions
277 handleDyn (\dyn -> do
280 PhaseFailed _ code -> exitWith code
281 Interrupted -> exitWith (ExitFailure 1)
282 _ -> do fatalErrorMsg dflags (text (show (dyn :: GhcException)))
283 exitWith (ExitFailure 1)
287 -- | Install a default cleanup handler to remove temporary files
288 -- deposited by a GHC run. This is seperate from
289 -- 'defaultErrorHandler', because you might want to override the error
290 -- handling, but still get the ordinary cleanup behaviour.
291 defaultCleanupHandler :: DynFlags -> IO a -> IO a
292 defaultCleanupHandler dflags inner =
293 -- make sure we clean up after ourselves
294 later (unless (dopt Opt_KeepTmpFiles dflags) $
295 cleanTempFiles dflags)
296 -- exceptions will be blocked while we clean the temporary files,
297 -- so there shouldn't be any difficulty if we receive further
302 -- | Initialises GHC. This must be done /once/ only. Takes the
303 -- command-line arguments. All command-line arguments which aren't
304 -- understood by GHC will be returned.
306 init :: [String] -> IO [String]
309 main_thread <- myThreadId
310 putMVar interruptTargetThread [main_thread]
311 installSignalHandlers
313 -- Grab the -B option if there is one
314 let (minusB_args, argv1) = partition (prefixMatch "-B") args
315 dflags0 <- initSysTools minusB_args defaultDynFlags
316 writeIORef v_initDynFlags dflags0
318 -- Parse the static flags
319 argv2 <- parseStaticFlags argv1
322 GLOBAL_VAR(v_initDynFlags, error "initDynFlags", DynFlags)
323 -- stores the DynFlags between the call to init and subsequent
324 -- calls to newSession.
326 -- | Starts a new session. A session consists of a set of loaded
327 -- modules, a set of options (DynFlags), and an interactive context.
328 -- ToDo: GhcMode should say "keep typechecked code" and\/or "keep renamed
330 newSession :: GhcMode -> IO Session
332 dflags0 <- readIORef v_initDynFlags
333 dflags <- initDynFlags dflags0
334 env <- newHscEnv dflags{ ghcMode=mode }
338 -- tmp: this breaks the abstraction, but required because DriverMkDepend
339 -- needs to call the Finder. ToDo: untangle this.
340 sessionHscEnv :: Session -> IO HscEnv
341 sessionHscEnv (Session ref) = readIORef ref
343 withSession :: Session -> (HscEnv -> IO a) -> IO a
344 withSession (Session ref) f = do h <- readIORef ref; f h
346 modifySession :: Session -> (HscEnv -> HscEnv) -> IO ()
347 modifySession (Session ref) f = do h <- readIORef ref; writeIORef ref $! f h
349 -- -----------------------------------------------------------------------------
352 -- | Grabs the DynFlags from the Session
353 getSessionDynFlags :: Session -> IO DynFlags
354 getSessionDynFlags s = withSession s (return . hsc_dflags)
356 -- | Updates the DynFlags in a Session
357 setSessionDynFlags :: Session -> DynFlags -> IO ()
358 setSessionDynFlags s dflags = modifySession s (\h -> h{ hsc_dflags = dflags })
360 -- | If there is no -o option, guess the name of target executable
361 -- by using top-level source file name as a base.
362 guessOutputFile :: Session -> IO ()
363 guessOutputFile s = modifySession s $ \env ->
364 let dflags = hsc_dflags env
365 mod_graph = hsc_mod_graph env
366 mainModuleSrcPath, guessedName :: Maybe String
367 mainModuleSrcPath = do
368 let isMain = (== mainModIs dflags) . ms_mod
369 [ms] <- return (filter isMain mod_graph)
370 ml_hs_file (ms_location ms)
371 guessedName = fmap basenameOf mainModuleSrcPath
373 case outputFile dflags of
375 Nothing -> env { hsc_dflags = dflags { outputFile = guessedName } }
377 -- -----------------------------------------------------------------------------
380 -- ToDo: think about relative vs. absolute file paths. And what
381 -- happens when the current directory changes.
383 -- | Sets the targets for this session. Each target may be a module name
384 -- or a filename. The targets correspond to the set of root modules for
385 -- the program\/library. Unloading the current program is achieved by
386 -- setting the current set of targets to be empty, followed by load.
387 setTargets :: Session -> [Target] -> IO ()
388 setTargets s targets = modifySession s (\h -> h{ hsc_targets = targets })
390 -- | returns the current set of targets
391 getTargets :: Session -> IO [Target]
392 getTargets s = withSession s (return . hsc_targets)
394 -- | Add another target
395 addTarget :: Session -> Target -> IO ()
397 = modifySession s (\h -> h{ hsc_targets = target : hsc_targets h })
400 removeTarget :: Session -> TargetId -> IO ()
401 removeTarget s target_id
402 = modifySession s (\h -> h{ hsc_targets = filter (hsc_targets h) })
404 filter targets = [ t | t@(Target id _) <- targets, id /= target_id ]
406 -- Attempts to guess what Target a string refers to. This function implements
407 -- the --make/GHCi command-line syntax for filenames:
409 -- - if the string looks like a Haskell source filename, then interpret
411 -- - if adding a .hs or .lhs suffix yields the name of an existing file,
413 -- - otherwise interpret the string as a module name
415 guessTarget :: String -> Maybe Phase -> IO Target
416 guessTarget file (Just phase)
417 = return (Target (TargetFile file (Just phase)) Nothing)
418 guessTarget file Nothing
419 | isHaskellSrcFilename file
420 = return (Target (TargetFile file Nothing) Nothing)
422 = do exists <- doesFileExist hs_file
424 then return (Target (TargetFile hs_file Nothing) Nothing)
426 exists <- doesFileExist lhs_file
428 then return (Target (TargetFile lhs_file Nothing) Nothing)
430 return (Target (TargetModule (mkModule file)) Nothing)
432 hs_file = file `joinFileExt` "hs"
433 lhs_file = file `joinFileExt` "lhs"
435 -- -----------------------------------------------------------------------------
436 -- Loading the program
438 -- Perform a dependency analysis starting from the current targets
439 -- and update the session with the new module graph.
440 depanal :: Session -> [Module] -> Bool -> IO (Maybe ModuleGraph)
441 depanal (Session ref) excluded_mods allow_dup_roots = do
442 hsc_env <- readIORef ref
444 dflags = hsc_dflags hsc_env
445 gmode = ghcMode (hsc_dflags hsc_env)
446 targets = hsc_targets hsc_env
447 old_graph = hsc_mod_graph hsc_env
449 showPass dflags "Chasing dependencies"
450 when (gmode == BatchCompile) $
451 debugTraceMsg dflags 1 (hcat [
452 text "Chasing modules from: ",
453 hcat (punctuate comma (map pprTarget targets))])
455 r <- downsweep hsc_env old_graph excluded_mods allow_dup_roots
457 Just mod_graph -> writeIORef ref hsc_env{ hsc_mod_graph = mod_graph }
462 -- | The result of load.
464 = LoadOk Errors -- ^ all specified targets were loaded successfully.
465 | LoadFailed Errors -- ^ not all modules were loaded.
467 type Errors = [String]
469 data ErrMsg = ErrMsg {
470 errMsgSeverity :: Severity, -- warning, error, etc.
471 errMsgSpans :: [SrcSpan],
472 errMsgShortDoc :: Doc,
473 errMsgExtraInfo :: Doc
480 | LoadDependenciesOf Module
482 -- | Try to load the program. If a Module is supplied, then just
483 -- attempt to load up to this target. If no Module is supplied,
484 -- then try to load all targets.
485 load :: Session -> LoadHowMuch -> IO SuccessFlag
486 load s@(Session ref) how_much
488 -- Dependency analysis first. Note that this fixes the module graph:
489 -- even if we don't get a fully successful upsweep, the full module
490 -- graph is still retained in the Session. We can tell which modules
491 -- were successfully loaded by inspecting the Session's HPT.
492 mb_graph <- depanal s [] False
494 Just mod_graph -> load2 s how_much mod_graph
495 Nothing -> return Failed
497 load2 s@(Session ref) how_much mod_graph = do
499 hsc_env <- readIORef ref
501 let hpt1 = hsc_HPT hsc_env
502 let dflags = hsc_dflags hsc_env
503 let ghci_mode = ghcMode dflags -- this never changes
505 -- The "bad" boot modules are the ones for which we have
506 -- B.hs-boot in the module graph, but no B.hs
507 -- The downsweep should have ensured this does not happen
509 let all_home_mods = [ms_mod s | s <- mod_graph, not (isBootSummary s)]
511 bad_boot_mods = [s | s <- mod_graph, isBootSummary s,
512 not (ms_mod s `elem` all_home_mods)]
514 ASSERT( null bad_boot_mods ) return ()
516 -- mg2_with_srcimps drops the hi-boot nodes, returning a
517 -- graph with cycles. Among other things, it is used for
518 -- backing out partially complete cycles following a failed
519 -- upsweep, and for removing from hpt all the modules
520 -- not in strict downwards closure, during calls to compile.
521 let mg2_with_srcimps :: [SCC ModSummary]
522 mg2_with_srcimps = topSortModuleGraph True mod_graph Nothing
524 -- check the stability property for each module.
525 stable_mods@(stable_obj,stable_bco)
526 | BatchCompile <- ghci_mode = ([],[])
527 | otherwise = checkStability hpt1 mg2_with_srcimps all_home_mods
529 -- prune bits of the HPT which are definitely redundant now,
531 pruned_hpt = pruneHomePackageTable hpt1
532 (flattenSCCs mg2_with_srcimps)
537 debugTraceMsg dflags 2 (text "Stable obj:" <+> ppr stable_obj $$
538 text "Stable BCO:" <+> ppr stable_bco)
540 -- Unload any modules which are going to be re-linked this time around.
541 let stable_linkables = [ linkable
542 | m <- stable_obj++stable_bco,
543 Just hmi <- [lookupModuleEnv pruned_hpt m],
544 Just linkable <- [hm_linkable hmi] ]
545 unload hsc_env stable_linkables
547 -- We could at this point detect cycles which aren't broken by
548 -- a source-import, and complain immediately, but it seems better
549 -- to let upsweep_mods do this, so at least some useful work gets
550 -- done before the upsweep is abandoned.
551 --hPutStrLn stderr "after tsort:\n"
552 --hPutStrLn stderr (showSDoc (vcat (map ppr mg2)))
554 -- Now do the upsweep, calling compile for each module in
555 -- turn. Final result is version 3 of everything.
557 -- Topologically sort the module graph, this time including hi-boot
558 -- nodes, and possibly just including the portion of the graph
559 -- reachable from the module specified in the 2nd argument to load.
560 -- This graph should be cycle-free.
561 -- If we're restricting the upsweep to a portion of the graph, we
562 -- also want to retain everything that is still stable.
563 let full_mg :: [SCC ModSummary]
564 full_mg = topSortModuleGraph False mod_graph Nothing
566 maybe_top_mod = case how_much of
568 LoadDependenciesOf m -> Just m
571 partial_mg0 :: [SCC ModSummary]
572 partial_mg0 = topSortModuleGraph False mod_graph maybe_top_mod
574 -- LoadDependenciesOf m: we want the upsweep to stop just
575 -- short of the specified module (unless the specified module
578 | LoadDependenciesOf mod <- how_much
579 = ASSERT( case last partial_mg0 of
580 AcyclicSCC ms -> ms_mod ms == mod; _ -> False )
581 List.init partial_mg0
587 | AcyclicSCC ms <- full_mg,
588 ms_mod ms `elem` stable_obj++stable_bco,
589 ms_mod ms `notElem` [ ms_mod ms' |
590 AcyclicSCC ms' <- partial_mg ] ]
592 mg = stable_mg ++ partial_mg
594 -- clean up between compilations
595 let cleanup = cleanTempFilesExcept dflags
596 (ppFilesFromSummaries (flattenSCCs mg2_with_srcimps))
598 (upsweep_ok, hsc_env1, modsUpswept)
599 <- upsweep (hsc_env { hsc_HPT = emptyHomePackageTable })
600 pruned_hpt stable_mods cleanup mg
602 -- Make modsDone be the summaries for each home module now
603 -- available; this should equal the domain of hpt3.
604 -- Get in in a roughly top .. bottom order (hence reverse).
606 let modsDone = reverse modsUpswept
608 -- Try and do linking in some form, depending on whether the
609 -- upsweep was completely or only partially successful.
611 if succeeded upsweep_ok
614 -- Easy; just relink it all.
615 do debugTraceMsg dflags 2 (text "Upsweep completely successful.")
617 -- Clean up after ourselves
618 cleanTempFilesExcept dflags (ppFilesFromSummaries modsDone)
620 -- Issue a warning for the confusing case where the user
621 -- said '-o foo' but we're not going to do any linking.
622 -- We attempt linking if either (a) one of the modules is
623 -- called Main, or (b) the user said -no-hs-main, indicating
624 -- that main() is going to come from somewhere else.
626 let ofile = outputFile dflags
627 let no_hs_main = dopt Opt_NoHsMain dflags
629 main_mod = mainModIs dflags
630 a_root_is_Main = any ((==main_mod).ms_mod) mod_graph
631 do_linking = a_root_is_Main || no_hs_main
633 when (ghci_mode == BatchCompile && isJust ofile && not do_linking) $
634 debugTraceMsg dflags 1 (text ("Warning: output was redirected with -o, " ++
635 "but no output will be generated\n" ++
636 "because there is no " ++ moduleString main_mod ++ " module."))
638 -- link everything together
639 linkresult <- link ghci_mode dflags do_linking (hsc_HPT hsc_env1)
641 loadFinish Succeeded linkresult ref hsc_env1
644 -- Tricky. We need to back out the effects of compiling any
645 -- half-done cycles, both so as to clean up the top level envs
646 -- and to avoid telling the interactive linker to link them.
647 do debugTraceMsg dflags 2 (text "Upsweep partially successful.")
650 = map ms_mod modsDone
651 let mods_to_zap_names
652 = findPartiallyCompletedCycles modsDone_names
655 = filter ((`notElem` mods_to_zap_names).ms_mod)
658 let hpt4 = retainInTopLevelEnvs (map ms_mod mods_to_keep)
661 -- Clean up after ourselves
662 cleanTempFilesExcept dflags (ppFilesFromSummaries mods_to_keep)
664 -- there should be no Nothings where linkables should be, now
665 ASSERT(all (isJust.hm_linkable)
666 (moduleEnvElts (hsc_HPT hsc_env))) do
668 -- Link everything together
669 linkresult <- link ghci_mode dflags False hpt4
671 let hsc_env4 = hsc_env1{ hsc_HPT = hpt4 }
672 loadFinish Failed linkresult ref hsc_env4
674 -- Finish up after a load.
676 -- If the link failed, unload everything and return.
677 loadFinish all_ok Failed ref hsc_env
678 = do unload hsc_env []
679 writeIORef ref $! discardProg hsc_env
682 -- Empty the interactive context and set the module context to the topmost
683 -- newly loaded module, or the Prelude if none were loaded.
684 loadFinish all_ok Succeeded ref hsc_env
685 = do writeIORef ref $! hsc_env{ hsc_IC = emptyInteractiveContext }
689 -- Forget the current program, but retain the persistent info in HscEnv
690 discardProg :: HscEnv -> HscEnv
692 = hsc_env { hsc_mod_graph = emptyMG,
693 hsc_IC = emptyInteractiveContext,
694 hsc_HPT = emptyHomePackageTable }
696 -- used to fish out the preprocess output files for the purposes of
697 -- cleaning up. The preprocessed file *might* be the same as the
698 -- source file, but that doesn't do any harm.
699 ppFilesFromSummaries summaries = [ fn | Just fn <- map ms_hspp_file summaries ]
701 -- -----------------------------------------------------------------------------
705 CheckedModule { parsedSource :: ParsedSource,
706 renamedSource :: Maybe RenamedSource,
707 typecheckedSource :: Maybe TypecheckedSource,
708 checkedModuleInfo :: Maybe ModuleInfo
710 -- ToDo: improvements that could be made here:
711 -- if the module succeeded renaming but not typechecking,
712 -- we can still get back the GlobalRdrEnv and exports, so
713 -- perhaps the ModuleInfo should be split up into separate
714 -- fields within CheckedModule.
716 type ParsedSource = Located (HsModule RdrName)
717 type RenamedSource = HsGroup Name
718 type TypecheckedSource = LHsBinds Id
721 -- - things that aren't in the output of the renamer:
724 -- - things that aren't in the output of the typechecker right now:
728 -- - type/data/newtype declarations
729 -- - class declarations
731 -- - extra things in the typechecker's output:
732 -- - default methods are turned into top-level decls.
733 -- - dictionary bindings
736 -- | This is the way to get access to parsed and typechecked source code
737 -- for a module. 'checkModule' loads all the dependencies of the specified
738 -- module in the Session, and then attempts to typecheck the module. If
739 -- successful, it returns the abstract syntax for the module.
740 checkModule :: Session -> Module -> IO (Maybe CheckedModule)
741 checkModule session@(Session ref) mod = do
742 -- load up the dependencies first
743 r <- load session (LoadDependenciesOf mod)
744 if (failed r) then return Nothing else do
746 -- now parse & typecheck the module
747 hsc_env <- readIORef ref
748 let mg = hsc_mod_graph hsc_env
749 case [ ms | ms <- mg, ms_mod ms == mod ] of
752 -- Add in the OPTIONS from the source file This is nasty:
753 -- we've done this once already, in the compilation manager
754 -- It might be better to cache the flags in the
755 -- ml_hspp_file field, say
756 let dflags0 = hsc_dflags hsc_env
757 hspp_buf = expectJust "GHC.checkModule" (ms_hspp_buf ms)
758 filename = fromJust (ml_hs_file (ms_location ms))
759 opts = getOptionsFromStringBuffer hspp_buf filename
760 (dflags1,leftovers) <- parseDynamicFlags dflags0 (map snd opts)
761 if (not (null leftovers))
762 then do printErrorsAndWarnings dflags1 (optionsErrorMsgs leftovers opts filename)
766 r <- hscFileCheck hsc_env{hsc_dflags=dflags1} ms
770 HscChecked parsed renamed Nothing ->
771 return (Just (CheckedModule {
772 parsedSource = parsed,
773 renamedSource = renamed,
774 typecheckedSource = Nothing,
775 checkedModuleInfo = Nothing }))
776 HscChecked parsed renamed
777 (Just (tc_binds, rdr_env, details)) -> do
778 let minf = ModuleInfo {
779 minf_type_env = md_types details,
780 minf_exports = md_exports details,
781 minf_rdr_env = Just rdr_env,
782 minf_instances = md_insts details
784 return (Just (CheckedModule {
785 parsedSource = parsed,
786 renamedSource = renamed,
787 typecheckedSource = Just tc_binds,
788 checkedModuleInfo = Just minf }))
792 -- ---------------------------------------------------------------------------
795 unload :: HscEnv -> [Linkable] -> IO ()
796 unload hsc_env stable_linkables -- Unload everthing *except* 'stable_linkables'
797 = case ghcMode (hsc_dflags hsc_env) of
798 BatchCompile -> return ()
799 JustTypecheck -> return ()
801 Interactive -> Linker.unload (hsc_dflags hsc_env) stable_linkables
803 Interactive -> panic "unload: no interpreter"
805 other -> panic "unload: strange mode"
807 -- -----------------------------------------------------------------------------
811 Stability tells us which modules definitely do not need to be recompiled.
812 There are two main reasons for having stability:
814 - avoid doing a complete upsweep of the module graph in GHCi when
815 modules near the bottom of the tree have not changed.
817 - to tell GHCi when it can load object code: we can only load object code
818 for a module when we also load object code fo all of the imports of the
819 module. So we need to know that we will definitely not be recompiling
820 any of these modules, and we can use the object code.
822 NB. stability is of no importance to BatchCompile at all, only Interactive.
823 (ToDo: what about JustTypecheck?)
825 The stability check is as follows. Both stableObject and
826 stableBCO are used during the upsweep phase later.
829 stable m = stableObject m || stableBCO m
832 all stableObject (imports m)
833 && old linkable does not exist, or is == on-disk .o
834 && date(on-disk .o) > date(.hs)
837 all stable (imports m)
838 && date(BCO) > date(.hs)
841 These properties embody the following ideas:
843 - if a module is stable:
844 - if it has been compiled in a previous pass (present in HPT)
845 then it does not need to be compiled or re-linked.
846 - if it has not been compiled in a previous pass,
847 then we only need to read its .hi file from disk and
848 link it to produce a ModDetails.
850 - if a modules is not stable, we will definitely be at least
851 re-linking, and possibly re-compiling it during the upsweep.
852 All non-stable modules can (and should) therefore be unlinked
855 - Note that objects are only considered stable if they only depend
856 on other objects. We can't link object code against byte code.
860 :: HomePackageTable -- HPT from last compilation
861 -> [SCC ModSummary] -- current module graph (cyclic)
862 -> [Module] -- all home modules
863 -> ([Module], -- stableObject
864 [Module]) -- stableBCO
866 checkStability hpt sccs all_home_mods = foldl checkSCC ([],[]) sccs
868 checkSCC (stable_obj, stable_bco) scc0
869 | stableObjects = (scc_mods ++ stable_obj, stable_bco)
870 | stableBCOs = (stable_obj, scc_mods ++ stable_bco)
871 | otherwise = (stable_obj, stable_bco)
873 scc = flattenSCC scc0
874 scc_mods = map ms_mod scc
875 home_module m = m `elem` all_home_mods && m `notElem` scc_mods
877 scc_allimps = nub (filter home_module (concatMap ms_allimps scc))
878 -- all imports outside the current SCC, but in the home pkg
880 stable_obj_imps = map (`elem` stable_obj) scc_allimps
881 stable_bco_imps = map (`elem` stable_bco) scc_allimps
888 and (zipWith (||) stable_obj_imps stable_bco_imps)
892 | Just t <- ms_obj_date ms = t >= ms_hs_date ms
896 same_as_prev t = case lookupModuleEnv hpt (ms_mod ms) of
897 Just hmi | Just l <- hm_linkable hmi
898 -> isObjectLinkable l && t == linkableTime l
900 -- why '>=' rather than '>' above? If the filesystem stores
901 -- times to the nearset second, we may occasionally find that
902 -- the object & source have the same modification time,
903 -- especially if the source was automatically generated
904 -- and compiled. Using >= is slightly unsafe, but it matches
908 = case lookupModuleEnv hpt (ms_mod ms) of
909 Just hmi | Just l <- hm_linkable hmi ->
910 not (isObjectLinkable l) &&
911 linkableTime l >= ms_hs_date ms
914 ms_allimps :: ModSummary -> [Module]
915 ms_allimps ms = map unLoc (ms_srcimps ms ++ ms_imps ms)
917 -- -----------------------------------------------------------------------------
918 -- Prune the HomePackageTable
920 -- Before doing an upsweep, we can throw away:
922 -- - For non-stable modules:
923 -- - all ModDetails, all linked code
924 -- - all unlinked code that is out of date with respect to
927 -- This is VERY IMPORTANT otherwise we'll end up requiring 2x the
928 -- space at the end of the upsweep, because the topmost ModDetails of the
929 -- old HPT holds on to the entire type environment from the previous
932 pruneHomePackageTable
935 -> ([Module],[Module])
938 pruneHomePackageTable hpt summ (stable_obj, stable_bco)
939 = mapModuleEnv prune hpt
941 | is_stable modl = hmi'
942 | otherwise = hmi'{ hm_details = emptyModDetails }
944 modl = mi_module (hm_iface hmi)
945 hmi' | Just l <- hm_linkable hmi, linkableTime l < ms_hs_date ms
946 = hmi{ hm_linkable = Nothing }
949 where ms = expectJust "prune" (lookupModuleEnv ms_map modl)
951 ms_map = mkModuleEnv [(ms_mod ms, ms) | ms <- summ]
953 is_stable m = m `elem` stable_obj || m `elem` stable_bco
955 -- -----------------------------------------------------------------------------
957 -- Return (names of) all those in modsDone who are part of a cycle
958 -- as defined by theGraph.
959 findPartiallyCompletedCycles :: [Module] -> [SCC ModSummary] -> [Module]
960 findPartiallyCompletedCycles modsDone theGraph
964 chew ((AcyclicSCC v):rest) = chew rest -- acyclic? not interesting.
965 chew ((CyclicSCC vs):rest)
966 = let names_in_this_cycle = nub (map ms_mod vs)
968 = nub ([done | done <- modsDone,
969 done `elem` names_in_this_cycle])
970 chewed_rest = chew rest
972 if notNull mods_in_this_cycle
973 && length mods_in_this_cycle < length names_in_this_cycle
974 then mods_in_this_cycle ++ chewed_rest
977 -- -----------------------------------------------------------------------------
980 -- This is where we compile each module in the module graph, in a pass
981 -- from the bottom to the top of the graph.
983 -- There better had not be any cyclic groups here -- we check for them.
986 :: HscEnv -- Includes initially-empty HPT
987 -> HomePackageTable -- HPT from last time round (pruned)
988 -> ([Module],[Module]) -- stable modules (see checkStability)
989 -> IO () -- How to clean up unwanted tmp files
990 -> [SCC ModSummary] -- Mods to do (the worklist)
992 HscEnv, -- With an updated HPT
993 [ModSummary]) -- Mods which succeeded
995 upsweep hsc_env old_hpt stable_mods cleanup mods
996 = upsweep' hsc_env old_hpt stable_mods cleanup mods 1 (length mods)
998 upsweep' hsc_env old_hpt stable_mods cleanup
1000 = return (Succeeded, hsc_env, [])
1002 upsweep' hsc_env old_hpt stable_mods cleanup
1003 (CyclicSCC ms:_) _ _
1004 = do fatalErrorMsg (hsc_dflags hsc_env) (cyclicModuleErr ms)
1005 return (Failed, hsc_env, [])
1007 upsweep' hsc_env old_hpt stable_mods cleanup
1008 (AcyclicSCC mod:mods) mod_index nmods
1009 = do -- putStrLn ("UPSWEEP_MOD: hpt = " ++
1010 -- show (map (moduleUserString.moduleName.mi_module.hm_iface)
1011 -- (moduleEnvElts (hsc_HPT hsc_env)))
1013 mb_mod_info <- upsweep_mod hsc_env old_hpt stable_mods mod
1016 cleanup -- Remove unwanted tmp files between compilations
1019 Nothing -> return (Failed, hsc_env, [])
1021 { let this_mod = ms_mod mod
1023 -- Add new info to hsc_env
1024 hpt1 = extendModuleEnv (hsc_HPT hsc_env)
1026 hsc_env1 = hsc_env { hsc_HPT = hpt1 }
1028 -- Space-saving: delete the old HPT entry
1029 -- for mod BUT if mod is a hs-boot
1030 -- node, don't delete it. For the
1031 -- interface, the HPT entry is probaby for the
1032 -- main Haskell source file. Deleting it
1033 -- would force .. (what?? --SDM)
1034 old_hpt1 | isBootSummary mod = old_hpt
1035 | otherwise = delModuleEnv old_hpt this_mod
1037 ; (restOK, hsc_env2, modOKs)
1038 <- upsweep' hsc_env1 old_hpt1 stable_mods cleanup
1039 mods (mod_index+1) nmods
1040 ; return (restOK, hsc_env2, mod:modOKs)
1044 -- Compile a single module. Always produce a Linkable for it if
1045 -- successful. If no compilation happened, return the old Linkable.
1046 upsweep_mod :: HscEnv
1048 -> ([Module],[Module])
1050 -> Int -- index of module
1051 -> Int -- total number of modules
1052 -> IO (Maybe HomeModInfo) -- Nothing => Failed
1054 upsweep_mod hsc_env old_hpt (stable_obj, stable_bco) summary mod_index nmods
1057 this_mod = ms_mod summary
1058 mb_obj_date = ms_obj_date summary
1059 obj_fn = ml_obj_file (ms_location summary)
1060 hs_date = ms_hs_date summary
1062 compile_it :: Maybe Linkable -> IO (Maybe HomeModInfo)
1063 compile_it = upsweep_compile hsc_env old_hpt this_mod
1064 summary mod_index nmods
1066 case ghcMode (hsc_dflags hsc_env) of
1069 -- Batch-compilating is easy: just check whether we have
1070 -- an up-to-date object file. If we do, then the compiler
1071 -- needs to do a recompilation check.
1072 _ | Just obj_date <- mb_obj_date, obj_date >= hs_date -> do
1074 findObjectLinkable this_mod obj_fn obj_date
1075 compile_it (Just linkable)
1082 _ | is_stable_obj, isJust old_hmi ->
1084 -- object is stable, and we have an entry in the
1085 -- old HPT: nothing to do
1087 | is_stable_obj, isNothing old_hmi -> do
1089 findObjectLinkable this_mod obj_fn
1090 (expectJust "upseep1" mb_obj_date)
1091 compile_it (Just linkable)
1092 -- object is stable, but we need to load the interface
1093 -- off disk to make a HMI.
1096 ASSERT(isJust old_hmi) -- must be in the old_hpt
1098 -- BCO is stable: nothing to do
1100 | Just hmi <- old_hmi,
1101 Just l <- hm_linkable hmi, not (isObjectLinkable l),
1102 linkableTime l >= ms_hs_date summary ->
1104 -- we have an old BCO that is up to date with respect
1105 -- to the source: do a recompilation check as normal.
1109 -- no existing code at all: we must recompile.
1111 is_stable_obj = this_mod `elem` stable_obj
1112 is_stable_bco = this_mod `elem` stable_bco
1114 old_hmi = lookupModuleEnv old_hpt this_mod
1116 -- Run hsc to compile a module
1117 upsweep_compile hsc_env old_hpt this_mod summary
1119 mb_old_linkable = do
1121 -- The old interface is ok if it's in the old HPT
1122 -- a) we're compiling a source file, and the old HPT
1123 -- entry is for a source file
1124 -- b) we're compiling a hs-boot file
1125 -- Case (b) allows an hs-boot file to get the interface of its
1126 -- real source file on the second iteration of the compilation
1127 -- manager, but that does no harm. Otherwise the hs-boot file
1128 -- will always be recompiled
1131 = case lookupModuleEnv old_hpt this_mod of
1133 Just hm_info | isBootSummary summary -> Just iface
1134 | not (mi_boot iface) -> Just iface
1135 | otherwise -> Nothing
1137 iface = hm_iface hm_info
1139 compresult <- compile hsc_env summary mb_old_linkable mb_old_iface
1143 -- Compilation failed. Compile may still have updated the PCS, tho.
1144 CompErrs -> return Nothing
1146 -- Compilation "succeeded", and may or may not have returned a new
1147 -- linkable (depending on whether compilation was actually performed
1149 CompOK new_details new_iface new_linkable
1150 -> do let new_info = HomeModInfo { hm_iface = new_iface,
1151 hm_details = new_details,
1152 hm_linkable = new_linkable }
1153 return (Just new_info)
1156 -- Filter modules in the HPT
1157 retainInTopLevelEnvs :: [Module] -> HomePackageTable -> HomePackageTable
1158 retainInTopLevelEnvs keep_these hpt
1159 = mkModuleEnv [ (mod, expectJust "retain" mb_mod_info)
1161 , let mb_mod_info = lookupModuleEnv hpt mod
1162 , isJust mb_mod_info ]
1164 -- ---------------------------------------------------------------------------
1165 -- Topological sort of the module graph
1168 :: Bool -- Drop hi-boot nodes? (see below)
1172 -- Calculate SCCs of the module graph, possibly dropping the hi-boot nodes
1173 -- The resulting list of strongly-connected-components is in topologically
1174 -- sorted order, starting with the module(s) at the bottom of the
1175 -- dependency graph (ie compile them first) and ending with the ones at
1178 -- Drop hi-boot nodes (first boolean arg)?
1180 -- False: treat the hi-boot summaries as nodes of the graph,
1181 -- so the graph must be acyclic
1183 -- True: eliminate the hi-boot nodes, and instead pretend
1184 -- the a source-import of Foo is an import of Foo
1185 -- The resulting graph has no hi-boot nodes, but can by cyclic
1187 topSortModuleGraph drop_hs_boot_nodes summaries Nothing
1188 = stronglyConnComp (fst (moduleGraphNodes drop_hs_boot_nodes summaries))
1189 topSortModuleGraph drop_hs_boot_nodes summaries (Just mod)
1190 = stronglyConnComp (map vertex_fn (reachable graph root))
1192 -- restrict the graph to just those modules reachable from
1193 -- the specified module. We do this by building a graph with
1194 -- the full set of nodes, and determining the reachable set from
1195 -- the specified node.
1196 (nodes, lookup_key) = moduleGraphNodes drop_hs_boot_nodes summaries
1197 (graph, vertex_fn, key_fn) = graphFromEdges' nodes
1199 | Just key <- lookup_key HsSrcFile mod, Just v <- key_fn key = v
1200 | otherwise = throwDyn (ProgramError "module does not exist")
1202 moduleGraphNodes :: Bool -> [ModSummary]
1203 -> ([(ModSummary, Int, [Int])], HscSource -> Module -> Maybe Int)
1204 moduleGraphNodes drop_hs_boot_nodes summaries = (nodes, lookup_key)
1206 -- Drop hs-boot nodes by using HsSrcFile as the key
1207 hs_boot_key | drop_hs_boot_nodes = HsSrcFile
1208 | otherwise = HsBootFile
1210 -- We use integers as the keys for the SCC algorithm
1211 nodes :: [(ModSummary, Int, [Int])]
1212 nodes = [(s, expectJust "topSort" (lookup_key (ms_hsc_src s) (ms_mod s)),
1213 out_edge_keys hs_boot_key (map unLoc (ms_srcimps s)) ++
1214 out_edge_keys HsSrcFile (map unLoc (ms_imps s)) )
1216 , not (isBootSummary s && drop_hs_boot_nodes) ]
1217 -- Drop the hi-boot ones if told to do so
1219 key_map :: NodeMap Int
1220 key_map = listToFM ([(ms_mod s, ms_hsc_src s) | s <- summaries]
1223 lookup_key :: HscSource -> Module -> Maybe Int
1224 lookup_key hs_src mod = lookupFM key_map (mod, hs_src)
1226 out_edge_keys :: HscSource -> [Module] -> [Int]
1227 out_edge_keys hi_boot ms = mapCatMaybes (lookup_key hi_boot) ms
1228 -- If we want keep_hi_boot_nodes, then we do lookup_key with
1229 -- the IsBootInterface parameter True; else False
1232 type NodeKey = (Module, HscSource) -- The nodes of the graph are
1233 type NodeMap a = FiniteMap NodeKey a -- keyed by (mod, src_file_type) pairs
1235 msKey :: ModSummary -> NodeKey
1236 msKey (ModSummary { ms_mod = mod, ms_hsc_src = boot }) = (mod,boot)
1238 mkNodeMap :: [ModSummary] -> NodeMap ModSummary
1239 mkNodeMap summaries = listToFM [ (msKey s, s) | s <- summaries]
1241 nodeMapElts :: NodeMap a -> [a]
1242 nodeMapElts = eltsFM
1244 -----------------------------------------------------------------------------
1245 -- Downsweep (dependency analysis)
1247 -- Chase downwards from the specified root set, returning summaries
1248 -- for all home modules encountered. Only follow source-import
1251 -- We pass in the previous collection of summaries, which is used as a
1252 -- cache to avoid recalculating a module summary if the source is
1255 -- The returned list of [ModSummary] nodes has one node for each home-package
1256 -- module, plus one for any hs-boot files. The imports of these nodes
1257 -- are all there, including the imports of non-home-package modules.
1260 -> [ModSummary] -- Old summaries
1261 -> [Module] -- Ignore dependencies on these; treat
1262 -- them as if they were package modules
1263 -> Bool -- True <=> allow multiple targets to have
1264 -- the same module name; this is
1265 -- very useful for ghc -M
1266 -> IO (Maybe [ModSummary])
1267 -- The elts of [ModSummary] all have distinct
1268 -- (Modules, IsBoot) identifiers, unless the Bool is true
1269 -- in which case there can be repeats
1270 downsweep hsc_env old_summaries excl_mods allow_dup_roots
1271 = -- catch error messages and return them
1272 handleDyn (\err_msg -> printBagOfErrors (hsc_dflags hsc_env) (unitBag err_msg) >> return Nothing) $ do
1273 rootSummaries <- mapM getRootSummary roots
1274 let root_map = mkRootMap rootSummaries
1275 checkDuplicates root_map
1276 summs <- loop (concatMap msDeps rootSummaries) root_map
1279 roots = hsc_targets hsc_env
1281 old_summary_map :: NodeMap ModSummary
1282 old_summary_map = mkNodeMap old_summaries
1284 getRootSummary :: Target -> IO ModSummary
1285 getRootSummary (Target (TargetFile file mb_phase) maybe_buf)
1286 = do exists <- doesFileExist file
1288 then summariseFile hsc_env old_summaries file mb_phase maybe_buf
1289 else throwDyn $ mkPlainErrMsg noSrcSpan $
1290 text "can't find file:" <+> text file
1291 getRootSummary (Target (TargetModule modl) maybe_buf)
1292 = do maybe_summary <- summariseModule hsc_env old_summary_map False
1293 (L rootLoc modl) maybe_buf excl_mods
1294 case maybe_summary of
1295 Nothing -> packageModErr modl
1298 rootLoc = mkGeneralSrcSpan FSLIT("<command line>")
1300 -- In a root module, the filename is allowed to diverge from the module
1301 -- name, so we have to check that there aren't multiple root files
1302 -- defining the same module (otherwise the duplicates will be silently
1303 -- ignored, leading to confusing behaviour).
1304 checkDuplicates :: NodeMap [ModSummary] -> IO ()
1305 checkDuplicates root_map
1306 | allow_dup_roots = return ()
1307 | null dup_roots = return ()
1308 | otherwise = multiRootsErr (head dup_roots)
1310 dup_roots :: [[ModSummary]] -- Each at least of length 2
1311 dup_roots = filterOut isSingleton (nodeMapElts root_map)
1313 loop :: [(Located Module,IsBootInterface)]
1314 -- Work list: process these modules
1315 -> NodeMap [ModSummary]
1316 -- Visited set; the range is a list because
1317 -- the roots can have the same module names
1318 -- if allow_dup_roots is True
1320 -- The result includes the worklist, except
1321 -- for those mentioned in the visited set
1322 loop [] done = return (concat (nodeMapElts done))
1323 loop ((wanted_mod, is_boot) : ss) done
1324 | Just summs <- lookupFM done key
1325 = if isSingleton summs then
1328 do { multiRootsErr summs; return [] }
1329 | otherwise = do { mb_s <- summariseModule hsc_env old_summary_map
1330 is_boot wanted_mod Nothing excl_mods
1332 Nothing -> loop ss done
1333 Just s -> loop (msDeps s ++ ss)
1334 (addToFM done key [s]) }
1336 key = (unLoc wanted_mod, if is_boot then HsBootFile else HsSrcFile)
1338 mkRootMap :: [ModSummary] -> NodeMap [ModSummary]
1339 mkRootMap summaries = addListToFM_C (++) emptyFM
1340 [ (msKey s, [s]) | s <- summaries ]
1342 msDeps :: ModSummary -> [(Located Module, IsBootInterface)]
1343 -- (msDeps s) returns the dependencies of the ModSummary s.
1344 -- A wrinkle is that for a {-# SOURCE #-} import we return
1345 -- *both* the hs-boot file
1346 -- *and* the source file
1347 -- as "dependencies". That ensures that the list of all relevant
1348 -- modules always contains B.hs if it contains B.hs-boot.
1349 -- Remember, this pass isn't doing the topological sort. It's
1350 -- just gathering the list of all relevant ModSummaries
1352 concat [ [(m,True), (m,False)] | m <- ms_srcimps s ]
1353 ++ [ (m,False) | m <- ms_imps s ]
1355 -----------------------------------------------------------------------------
1356 -- Summarising modules
1358 -- We have two types of summarisation:
1360 -- * Summarise a file. This is used for the root module(s) passed to
1361 -- cmLoadModules. The file is read, and used to determine the root
1362 -- module name. The module name may differ from the filename.
1364 -- * Summarise a module. We are given a module name, and must provide
1365 -- a summary. The finder is used to locate the file in which the module
1370 -> [ModSummary] -- old summaries
1371 -> FilePath -- source file name
1372 -> Maybe Phase -- start phase
1373 -> Maybe (StringBuffer,ClockTime)
1376 summariseFile hsc_env old_summaries file mb_phase maybe_buf
1377 -- we can use a cached summary if one is available and the
1378 -- source file hasn't changed, But we have to look up the summary
1379 -- by source file, rather than module name as we do in summarise.
1380 | Just old_summary <- findSummaryBySourceFile old_summaries file
1382 let location = ms_location old_summary
1384 -- return the cached summary if the source didn't change
1385 src_timestamp <- case maybe_buf of
1386 Just (_,t) -> return t
1387 Nothing -> getModificationTime file
1388 -- The file exists; we checked in getRootSummary above.
1389 -- If it gets removed subsequently, then this
1390 -- getModificationTime may fail, but that's the right
1393 if ms_hs_date old_summary == src_timestamp
1394 then do -- update the object-file timestamp
1395 obj_timestamp <- getObjTimestamp location False
1396 return old_summary{ ms_obj_date = obj_timestamp }
1404 let dflags = hsc_dflags hsc_env
1406 (dflags', hspp_fn, buf)
1407 <- preprocessFile dflags file mb_phase maybe_buf
1409 (srcimps,the_imps, L _ mod) <- getImports dflags' buf hspp_fn
1411 -- Make a ModLocation for this file
1412 location <- mkHomeModLocation dflags mod file
1414 -- Tell the Finder cache where it is, so that subsequent calls
1415 -- to findModule will find it, even if it's not on any search path
1416 addHomeModuleToFinder hsc_env mod location
1418 src_timestamp <- case maybe_buf of
1419 Just (_,t) -> return t
1420 Nothing -> getModificationTime file
1421 -- getMofificationTime may fail
1423 obj_timestamp <- modificationTimeIfExists (ml_obj_file location)
1425 return (ModSummary { ms_mod = mod, ms_hsc_src = HsSrcFile,
1426 ms_location = location,
1427 ms_hspp_file = Just hspp_fn,
1428 ms_hspp_buf = Just buf,
1429 ms_srcimps = srcimps, ms_imps = the_imps,
1430 ms_hs_date = src_timestamp,
1431 ms_obj_date = obj_timestamp })
1433 findSummaryBySourceFile :: [ModSummary] -> FilePath -> Maybe ModSummary
1434 findSummaryBySourceFile summaries file
1435 = case [ ms | ms <- summaries, HsSrcFile <- [ms_hsc_src ms],
1436 fromJust (ml_hs_file (ms_location ms)) == file ] of
1440 -- Summarise a module, and pick up source and timestamp.
1443 -> NodeMap ModSummary -- Map of old summaries
1444 -> IsBootInterface -- True <=> a {-# SOURCE #-} import
1445 -> Located Module -- Imported module to be summarised
1446 -> Maybe (StringBuffer, ClockTime)
1447 -> [Module] -- Modules to exclude
1448 -> IO (Maybe ModSummary) -- Its new summary
1450 summariseModule hsc_env old_summary_map is_boot (L loc wanted_mod) maybe_buf excl_mods
1451 | wanted_mod `elem` excl_mods
1454 | Just old_summary <- lookupFM old_summary_map (wanted_mod, hsc_src)
1455 = do -- Find its new timestamp; all the
1456 -- ModSummaries in the old map have valid ml_hs_files
1457 let location = ms_location old_summary
1458 src_fn = expectJust "summariseModule" (ml_hs_file location)
1460 -- check the modification time on the source file, and
1461 -- return the cached summary if it hasn't changed. If the
1462 -- file has disappeared, we need to call the Finder again.
1464 Just (_,t) -> check_timestamp old_summary location src_fn t
1466 m <- System.IO.Error.try (getModificationTime src_fn)
1468 Right t -> check_timestamp old_summary location src_fn t
1469 Left e | isDoesNotExistError e -> find_it
1470 | otherwise -> ioError e
1472 | otherwise = find_it
1474 dflags = hsc_dflags hsc_env
1476 hsc_src = if is_boot then HsBootFile else HsSrcFile
1478 check_timestamp old_summary location src_fn src_timestamp
1479 | ms_hs_date old_summary == src_timestamp = do
1480 -- update the object-file timestamp
1481 obj_timestamp <- getObjTimestamp location is_boot
1482 return (Just old_summary{ ms_obj_date = obj_timestamp })
1484 -- source changed: find and re-summarise. We call the finder
1485 -- again, because the user may have moved the source file.
1486 new_summary location src_fn src_timestamp
1489 -- Don't use the Finder's cache this time. If the module was
1490 -- previously a package module, it may have now appeared on the
1491 -- search path, so we want to consider it to be a home module. If
1492 -- the module was previously a home module, it may have moved.
1493 uncacheModule hsc_env wanted_mod
1494 found <- findModule hsc_env wanted_mod True {-explicit-}
1497 | not (isHomePackage pkg) -> return Nothing
1498 -- Drop external-pkg
1499 | isJust (ml_hs_file location) -> just_found location
1501 err -> noModError dflags loc wanted_mod err
1504 just_found location = do
1505 -- Adjust location to point to the hs-boot source file,
1506 -- hi file, object file, when is_boot says so
1507 let location' | is_boot = addBootSuffixLocn location
1508 | otherwise = location
1509 src_fn = expectJust "summarise2" (ml_hs_file location')
1511 -- Check that it exists
1512 -- It might have been deleted since the Finder last found it
1513 maybe_t <- modificationTimeIfExists src_fn
1515 Nothing -> noHsFileErr loc src_fn
1516 Just t -> new_summary location' src_fn t
1519 new_summary location src_fn src_timestamp
1521 -- Preprocess the source file and get its imports
1522 -- The dflags' contains the OPTIONS pragmas
1523 (dflags', hspp_fn, buf) <- preprocessFile dflags src_fn Nothing maybe_buf
1524 (srcimps, the_imps, L mod_loc mod_name) <- getImports dflags' buf hspp_fn
1526 when (mod_name /= wanted_mod) $
1527 throwDyn $ mkPlainErrMsg mod_loc $
1528 text "file name does not match module name"
1529 <+> quotes (ppr mod_name)
1531 -- Find the object timestamp, and return the summary
1532 obj_timestamp <- getObjTimestamp location is_boot
1534 return (Just ( ModSummary { ms_mod = wanted_mod,
1535 ms_hsc_src = hsc_src,
1536 ms_location = location,
1537 ms_hspp_file = Just hspp_fn,
1538 ms_hspp_buf = Just buf,
1539 ms_srcimps = srcimps,
1541 ms_hs_date = src_timestamp,
1542 ms_obj_date = obj_timestamp }))
1545 getObjTimestamp location is_boot
1546 = if is_boot then return Nothing
1547 else modificationTimeIfExists (ml_obj_file location)
1550 preprocessFile :: DynFlags -> FilePath -> Maybe Phase -> Maybe (StringBuffer,ClockTime)
1551 -> IO (DynFlags, FilePath, StringBuffer)
1552 preprocessFile dflags src_fn mb_phase Nothing
1554 (dflags', hspp_fn) <- preprocess dflags (src_fn, mb_phase)
1555 buf <- hGetStringBuffer hspp_fn
1556 return (dflags', hspp_fn, buf)
1558 preprocessFile dflags src_fn mb_phase (Just (buf, time))
1560 -- case we bypass the preprocessing stage?
1562 local_opts = getOptionsFromStringBuffer buf src_fn
1564 (dflags', errs) <- parseDynamicFlags dflags (map snd local_opts)
1568 | Just (Unlit _) <- mb_phase = True
1569 | Nothing <- mb_phase, Unlit _ <- startPhase src_fn = True
1570 -- note: local_opts is only required if there's no Unlit phase
1571 | dopt Opt_Cpp dflags' = True
1572 | dopt Opt_Pp dflags' = True
1575 when needs_preprocessing $
1576 ghcError (ProgramError "buffer needs preprocesing; interactive check disabled")
1578 return (dflags', src_fn, buf)
1581 -----------------------------------------------------------------------------
1583 -----------------------------------------------------------------------------
1585 noModError :: DynFlags -> SrcSpan -> Module -> FindResult -> IO ab
1586 -- ToDo: we don't have a proper line number for this error
1587 noModError dflags loc wanted_mod err
1588 = throwDyn $ mkPlainErrMsg loc $ cantFindError dflags wanted_mod err
1590 noHsFileErr loc path
1591 = throwDyn $ mkPlainErrMsg loc $ text "Can't find" <+> text path
1594 = throwDyn $ mkPlainErrMsg noSrcSpan $
1595 text "module" <+> quotes (ppr mod) <+> text "is a package module"
1597 multiRootsErr :: [ModSummary] -> IO ()
1598 multiRootsErr summs@(summ1:_)
1599 = throwDyn $ mkPlainErrMsg noSrcSpan $
1600 text "module" <+> quotes (ppr mod) <+>
1601 text "is defined in multiple files:" <+>
1602 sep (map text files)
1605 files = map (expectJust "checkDup" . ml_hs_file . ms_location) summs
1607 cyclicModuleErr :: [ModSummary] -> SDoc
1609 = hang (ptext SLIT("Module imports form a cycle for modules:"))
1610 2 (vcat (map show_one ms))
1612 show_one ms = sep [ show_mod (ms_hsc_src ms) (ms_mod ms),
1613 nest 2 $ ptext SLIT("imports:") <+>
1614 (pp_imps HsBootFile (ms_srcimps ms)
1615 $$ pp_imps HsSrcFile (ms_imps ms))]
1616 show_mod hsc_src mod = ppr mod <> text (hscSourceString hsc_src)
1617 pp_imps src mods = fsep (map (show_mod src) mods)
1620 -- | Inform GHC that the working directory has changed. GHC will flush
1621 -- its cache of module locations, since it may no longer be valid.
1622 -- Note: if you change the working directory, you should also unload
1623 -- the current program (set targets to empty, followed by load).
1624 workingDirectoryChanged :: Session -> IO ()
1625 workingDirectoryChanged s = withSession s $ \hsc_env ->
1626 flushFinderCache (hsc_FC hsc_env)
1628 -- -----------------------------------------------------------------------------
1629 -- inspecting the session
1631 -- | Get the module dependency graph.
1632 getModuleGraph :: Session -> IO ModuleGraph -- ToDo: DiGraph ModSummary
1633 getModuleGraph s = withSession s (return . hsc_mod_graph)
1635 isLoaded :: Session -> Module -> IO Bool
1636 isLoaded s m = withSession s $ \hsc_env ->
1637 return $! isJust (lookupModuleEnv (hsc_HPT hsc_env) m)
1639 getBindings :: Session -> IO [TyThing]
1640 getBindings s = withSession s (return . nameEnvElts . ic_type_env . hsc_IC)
1642 getPrintUnqual :: Session -> IO PrintUnqualified
1643 getPrintUnqual s = withSession s (return . icPrintUnqual . hsc_IC)
1645 -- | Container for information about a 'Module'.
1646 data ModuleInfo = ModuleInfo {
1647 minf_type_env :: TypeEnv,
1648 minf_exports :: NameSet,
1649 minf_rdr_env :: Maybe GlobalRdrEnv, -- Nothing for a compiled/package mod
1650 minf_instances :: [Instance]
1651 -- ToDo: this should really contain the ModIface too
1653 -- We don't want HomeModInfo here, because a ModuleInfo applies
1654 -- to package modules too.
1656 -- | Request information about a loaded 'Module'
1657 getModuleInfo :: Session -> Module -> IO (Maybe ModuleInfo)
1658 getModuleInfo s mdl = withSession s $ \hsc_env -> do
1659 let mg = hsc_mod_graph hsc_env
1660 if mdl `elem` map ms_mod mg
1661 then getHomeModuleInfo hsc_env mdl
1663 {- if isHomeModule (hsc_dflags hsc_env) mdl
1665 else -} getPackageModuleInfo hsc_env mdl
1666 -- getPackageModuleInfo will attempt to find the interface, so
1667 -- we don't want to call it for a home module, just in case there
1668 -- was a problem loading the module and the interface doesn't
1669 -- exist... hence the isHomeModule test here. (ToDo: reinstate)
1671 getPackageModuleInfo :: HscEnv -> Module -> IO (Maybe ModuleInfo)
1672 getPackageModuleInfo hsc_env mdl = do
1674 (_msgs, mb_names) <- getModuleExports hsc_env mdl
1676 Nothing -> return Nothing
1678 eps <- readIORef (hsc_EPS hsc_env)
1681 n_list = nameSetToList names
1682 tys = [ ty | name <- n_list,
1683 Just ty <- [lookupTypeEnv pte name] ]
1685 return (Just (ModuleInfo {
1686 minf_type_env = mkTypeEnv tys,
1687 minf_exports = names,
1688 minf_rdr_env = Just $! nameSetToGlobalRdrEnv names mdl,
1689 minf_instances = error "getModuleInfo: instances for package module unimplemented"
1692 -- bogusly different for non-GHCI (ToDo)
1696 getHomeModuleInfo hsc_env mdl =
1697 case lookupModuleEnv (hsc_HPT hsc_env) mdl of
1698 Nothing -> return Nothing
1700 let details = hm_details hmi
1701 return (Just (ModuleInfo {
1702 minf_type_env = md_types details,
1703 minf_exports = md_exports details,
1704 minf_rdr_env = mi_globals $! hm_iface hmi,
1705 minf_instances = md_insts details
1708 -- | The list of top-level entities defined in a module
1709 modInfoTyThings :: ModuleInfo -> [TyThing]
1710 modInfoTyThings minf = typeEnvElts (minf_type_env minf)
1712 modInfoTopLevelScope :: ModuleInfo -> Maybe [Name]
1713 modInfoTopLevelScope minf
1714 = fmap (map gre_name . globalRdrEnvElts) (minf_rdr_env minf)
1716 modInfoExports :: ModuleInfo -> [Name]
1717 modInfoExports minf = nameSetToList $! minf_exports minf
1719 -- | Returns the instances defined by the specified module.
1720 -- Warning: currently unimplemented for package modules.
1721 modInfoInstances :: ModuleInfo -> [Instance]
1722 modInfoInstances = minf_instances
1724 modInfoIsExportedName :: ModuleInfo -> Name -> Bool
1725 modInfoIsExportedName minf name = elemNameSet name (minf_exports minf)
1727 modInfoPrintUnqualified :: ModuleInfo -> Maybe PrintUnqualified
1728 modInfoPrintUnqualified minf = fmap unQualInScope (minf_rdr_env minf)
1730 modInfoLookupName :: Session -> ModuleInfo -> Name -> IO (Maybe TyThing)
1731 modInfoLookupName s minf name = withSession s $ \hsc_env -> do
1732 case lookupTypeEnv (minf_type_env minf) name of
1733 Just tyThing -> return (Just tyThing)
1735 eps <- readIORef (hsc_EPS hsc_env)
1736 return $! lookupType (hsc_HPT hsc_env) (eps_PTE eps) name
1738 isDictonaryId :: Id -> Bool
1740 = case tcSplitSigmaTy (idType id) of { (tvs, theta, tau) -> isDictTy tau }
1742 -- | Looks up a global name: that is, any top-level name in any
1743 -- visible module. Unlike 'lookupName', lookupGlobalName does not use
1744 -- the interactive context, and therefore does not require a preceding
1746 lookupGlobalName :: Session -> Name -> IO (Maybe TyThing)
1747 lookupGlobalName s name = withSession s $ \hsc_env -> do
1748 eps <- readIORef (hsc_EPS hsc_env)
1749 return $! lookupType (hsc_HPT hsc_env) (eps_PTE eps) name
1751 -- -----------------------------------------------------------------------------
1752 -- Misc exported utils
1754 dataConType :: DataCon -> Type
1755 dataConType dc = idType (dataConWrapId dc)
1757 -- | print a 'NamedThing', adding parentheses if the name is an operator.
1758 pprParenSymName :: NamedThing a => a -> SDoc
1759 pprParenSymName a = parenSymOcc (getOccName a) (ppr (getName a))
1761 -- ----------------------------------------------------------------------------
1766 -- - Data and Typeable instances for HsSyn.
1768 -- ToDo: check for small transformations that happen to the syntax in
1769 -- the typechecker (eg. -e ==> negate e, perhaps for fromIntegral)
1771 -- ToDo: maybe use TH syntax instead of IfaceSyn? There's already a way
1772 -- to get from TyCons, Ids etc. to TH syntax (reify).
1774 -- :browse will use either lm_toplev or inspect lm_interface, depending
1775 -- on whether the module is interpreted or not.
1777 -- This is for reconstructing refactored source code
1778 -- Calls the lexer repeatedly.
1779 -- ToDo: add comment tokens to token stream
1780 getTokenStream :: Session -> Module -> IO [Located Token]
1783 -- -----------------------------------------------------------------------------
1784 -- Interactive evaluation
1788 -- | Set the interactive evaluation context.
1790 -- Setting the context doesn't throw away any bindings; the bindings
1791 -- we've built up in the InteractiveContext simply move to the new
1792 -- module. They always shadow anything in scope in the current context.
1793 setContext :: Session
1794 -> [Module] -- entire top level scope of these modules
1795 -> [Module] -- exports only of these modules
1797 setContext (Session ref) toplevs exports = do
1798 hsc_env <- readIORef ref
1799 let old_ic = hsc_IC hsc_env
1800 hpt = hsc_HPT hsc_env
1802 mapM_ (checkModuleExists hsc_env hpt) exports
1803 export_env <- mkExportEnv hsc_env exports
1804 toplev_envs <- mapM (mkTopLevEnv hpt) toplevs
1805 let all_env = foldr plusGlobalRdrEnv export_env toplev_envs
1806 writeIORef ref hsc_env{ hsc_IC = old_ic { ic_toplev_scope = toplevs,
1807 ic_exports = exports,
1808 ic_rn_gbl_env = all_env }}
1811 -- Make a GlobalRdrEnv based on the exports of the modules only.
1812 mkExportEnv :: HscEnv -> [Module] -> IO GlobalRdrEnv
1813 mkExportEnv hsc_env mods = do
1814 stuff <- mapM (getModuleExports hsc_env) mods
1816 (_msgs, mb_name_sets) = unzip stuff
1817 gres = [ nameSetToGlobalRdrEnv name_set mod
1818 | (Just name_set, mod) <- zip mb_name_sets mods ]
1820 return $! foldr plusGlobalRdrEnv emptyGlobalRdrEnv gres
1822 nameSetToGlobalRdrEnv :: NameSet -> Module -> GlobalRdrEnv
1823 nameSetToGlobalRdrEnv names mod =
1824 mkGlobalRdrEnv [ GRE { gre_name = name, gre_prov = vanillaProv mod }
1825 | name <- nameSetToList names ]
1827 vanillaProv :: Module -> Provenance
1828 -- We're building a GlobalRdrEnv as if the user imported
1829 -- all the specified modules into the global interactive module
1830 vanillaProv mod = Imported [ImpSpec { is_decl = decl, is_item = ImpAll}]
1832 decl = ImpDeclSpec { is_mod = mod, is_as = mod,
1834 is_dloc = srcLocSpan interactiveSrcLoc }
1836 checkModuleExists :: HscEnv -> HomePackageTable -> Module -> IO ()
1837 checkModuleExists hsc_env hpt mod =
1838 case lookupModuleEnv hpt mod of
1839 Just mod_info -> return ()
1840 _not_a_home_module -> do
1841 res <- findPackageModule hsc_env mod True
1843 Found _ _ -> return ()
1844 err -> let msg = cantFindError (hsc_dflags hsc_env) mod err in
1845 throwDyn (CmdLineError (showSDoc msg))
1847 mkTopLevEnv :: HomePackageTable -> Module -> IO GlobalRdrEnv
1848 mkTopLevEnv hpt modl
1849 = case lookupModuleEnv hpt modl of
1851 throwDyn (ProgramError ("mkTopLevEnv: not a home module "
1852 ++ showSDoc (pprModule modl)))
1854 case mi_globals (hm_iface details) of
1856 throwDyn (ProgramError ("mkTopLevEnv: not interpreted "
1857 ++ showSDoc (pprModule modl)))
1858 Just env -> return env
1860 -- | Get the interactive evaluation context, consisting of a pair of the
1861 -- set of modules from which we take the full top-level scope, and the set
1862 -- of modules from which we take just the exports respectively.
1863 getContext :: Session -> IO ([Module],[Module])
1864 getContext s = withSession s (\HscEnv{ hsc_IC=ic } ->
1865 return (ic_toplev_scope ic, ic_exports ic))
1867 -- | Returns 'True' if the specified module is interpreted, and hence has
1868 -- its full top-level scope available.
1869 moduleIsInterpreted :: Session -> Module -> IO Bool
1870 moduleIsInterpreted s modl = withSession s $ \h ->
1871 case lookupModuleEnv (hsc_HPT h) modl of
1872 Just details -> return (isJust (mi_globals (hm_iface details)))
1873 _not_a_home_module -> return False
1875 -- | Looks up an identifier in the current interactive context (for :info)
1876 getInfo :: Session -> Name -> IO (Maybe (TyThing,Fixity,[Instance]))
1877 getInfo s name = withSession s $ \hsc_env -> tcRnGetInfo hsc_env name
1879 -- | Returns all names in scope in the current interactive context
1880 getNamesInScope :: Session -> IO [Name]
1881 getNamesInScope s = withSession s $ \hsc_env -> do
1882 return (map gre_name (globalRdrEnvElts (ic_rn_gbl_env (hsc_IC hsc_env))))
1884 -- | Parses a string as an identifier, and returns the list of 'Name's that
1885 -- the identifier can refer to in the current interactive context.
1886 parseName :: Session -> String -> IO [Name]
1887 parseName s str = withSession s $ \hsc_env -> do
1888 maybe_rdr_name <- hscParseIdentifier (hsc_dflags hsc_env) str
1889 case maybe_rdr_name of
1890 Nothing -> return []
1891 Just (L _ rdr_name) -> do
1892 mb_names <- tcRnLookupRdrName hsc_env rdr_name
1894 Nothing -> return []
1895 Just ns -> return ns
1896 -- ToDo: should return error messages
1898 -- | Returns the 'TyThing' for a 'Name'. The 'Name' may refer to any
1899 -- entity known to GHC, including 'Name's defined using 'runStmt'.
1900 lookupName :: Session -> Name -> IO (Maybe TyThing)
1901 lookupName s name = withSession s $ \hsc_env -> tcRnLookupName hsc_env name
1903 -- -----------------------------------------------------------------------------
1904 -- Getting the type of an expression
1906 -- | Get the type of an expression
1907 exprType :: Session -> String -> IO (Maybe Type)
1908 exprType s expr = withSession s $ \hsc_env -> do
1909 maybe_stuff <- hscTcExpr hsc_env expr
1911 Nothing -> return Nothing
1912 Just ty -> return (Just tidy_ty)
1914 tidy_ty = tidyType emptyTidyEnv ty
1916 -- -----------------------------------------------------------------------------
1917 -- Getting the kind of a type
1919 -- | Get the kind of a type
1920 typeKind :: Session -> String -> IO (Maybe Kind)
1921 typeKind s str = withSession s $ \hsc_env -> do
1922 maybe_stuff <- hscKcType hsc_env str
1924 Nothing -> return Nothing
1925 Just kind -> return (Just kind)
1927 -----------------------------------------------------------------------------
1928 -- cmCompileExpr: compile an expression and deliver an HValue
1930 compileExpr :: Session -> String -> IO (Maybe HValue)
1931 compileExpr s expr = withSession s $ \hsc_env -> do
1932 maybe_stuff <- hscStmt hsc_env ("let __cmCompileExpr = "++expr)
1934 Nothing -> return Nothing
1935 Just (new_ic, names, hval) -> do
1937 hvals <- (unsafeCoerce# hval) :: IO [HValue]
1939 case (names,hvals) of
1940 ([n],[hv]) -> return (Just hv)
1941 _ -> panic "compileExpr"
1943 -- -----------------------------------------------------------------------------
1944 -- running a statement interactively
1947 = RunOk [Name] -- ^ names bound by this evaluation
1948 | RunFailed -- ^ statement failed compilation
1949 | RunException Exception -- ^ statement raised an exception
1951 -- | Run a statement in the current interactive context. Statemenet
1952 -- may bind multple values.
1953 runStmt :: Session -> String -> IO RunResult
1954 runStmt (Session ref) expr
1956 hsc_env <- readIORef ref
1958 -- Turn off -fwarn-unused-bindings when running a statement, to hide
1959 -- warnings about the implicit bindings we introduce.
1960 let dflags' = dopt_unset (hsc_dflags hsc_env) Opt_WarnUnusedBinds
1961 hsc_env' = hsc_env{ hsc_dflags = dflags' }
1963 maybe_stuff <- hscStmt hsc_env' expr
1966 Nothing -> return RunFailed
1967 Just (new_hsc_env, names, hval) -> do
1969 let thing_to_run = unsafeCoerce# hval :: IO [HValue]
1970 either_hvals <- sandboxIO thing_to_run
1972 case either_hvals of
1974 -- on error, keep the *old* interactive context,
1975 -- so that 'it' is not bound to something
1976 -- that doesn't exist.
1977 return (RunException e)
1980 -- Get the newly bound things, and bind them.
1981 -- Don't need to delete any shadowed bindings;
1982 -- the new ones override the old ones.
1983 extendLinkEnv (zip names hvals)
1985 writeIORef ref new_hsc_env
1986 return (RunOk names)
1988 -- When running a computation, we redirect ^C exceptions to the running
1989 -- thread. ToDo: we might want a way to continue even if the target
1990 -- thread doesn't die when it receives the exception... "this thread
1991 -- is not responding".
1992 sandboxIO :: IO a -> IO (Either Exception a)
1993 sandboxIO thing = do
1995 ts <- takeMVar interruptTargetThread
1996 child <- forkIO (do res <- Exception.try thing; putMVar m res)
1997 putMVar interruptTargetThread (child:ts)
1998 takeMVar m `finally` modifyMVar_ interruptTargetThread (return.tail)
2001 -- This version of sandboxIO runs the expression in a completely new
2002 -- RTS main thread. It is disabled for now because ^C exceptions
2003 -- won't be delivered to the new thread, instead they'll be delivered
2004 -- to the (blocked) GHCi main thread.
2006 -- SLPJ: when re-enabling this, reflect a wrong-stat error as an exception
2008 sandboxIO :: IO a -> IO (Either Int (Either Exception a))
2009 sandboxIO thing = do
2010 st_thing <- newStablePtr (Exception.try thing)
2011 alloca $ \ p_st_result -> do
2012 stat <- rts_evalStableIO st_thing p_st_result
2013 freeStablePtr st_thing
2015 then do st_result <- peek p_st_result
2016 result <- deRefStablePtr st_result
2017 freeStablePtr st_result
2018 return (Right result)
2020 return (Left (fromIntegral stat))
2022 foreign import "rts_evalStableIO" {- safe -}
2023 rts_evalStableIO :: StablePtr (IO a) -> Ptr (StablePtr a) -> IO CInt
2024 -- more informative than the C type!
2027 -----------------------------------------------------------------------------
2028 -- show a module and it's source/object filenames
2030 showModule :: Session -> ModSummary -> IO String
2031 showModule s mod_summary = withSession s $ \hsc_env -> do
2032 case lookupModuleEnv (hsc_HPT hsc_env) (ms_mod mod_summary) of
2033 Nothing -> panic "missing linkable"
2034 Just mod_info -> return (showModMsg obj_linkable mod_summary)
2036 obj_linkable = isObjectLinkable (fromJust (hm_linkable mod_info))