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 ( isDoesNotExistError )
245 import System.IO.Unsafe ( unsafePerformIO )
246 import Prelude hiding (init)
248 #if __GLASGOW_HASKELL__ < 600
249 import System.IO as System.IO.Error ( try )
251 import System.IO.Error ( try )
254 -- -----------------------------------------------------------------------------
255 -- Exception handlers
257 -- | Install some default exception handlers and run the inner computation.
258 -- Unless you want to handle exceptions yourself, you should wrap this around
259 -- the top level of your program. The default handlers output the error
260 -- message(s) to stderr and exit cleanly.
261 defaultErrorHandler :: DynFlags -> IO a -> IO a
262 defaultErrorHandler dflags inner =
263 -- top-level exception handler: any unrecognised exception is a compiler bug.
264 handle (\exception -> do
267 -- an IO exception probably isn't our fault, so don't panic
269 fatalErrorMsg dflags (text (show exception))
270 AsyncException StackOverflow ->
271 fatalErrorMsg dflags (text "stack overflow: use +RTS -K<size> to increase it")
273 fatalErrorMsg dflags (text (show (Panic (show exception))))
274 exitWith (ExitFailure 1)
277 -- program errors: messages with locations attached. Sometimes it is
278 -- convenient to just throw these as exceptions.
279 handleDyn (\dyn -> do printBagOfErrors dflags (unitBag dyn)
280 exitWith (ExitFailure 1)) $
282 -- error messages propagated as exceptions
283 handleDyn (\dyn -> do
286 PhaseFailed _ code -> exitWith code
287 Interrupted -> exitWith (ExitFailure 1)
288 _ -> do fatalErrorMsg dflags (text (show (dyn :: GhcException)))
289 exitWith (ExitFailure 1)
293 -- | Install a default cleanup handler to remove temporary files
294 -- deposited by a GHC run. This is seperate from
295 -- 'defaultErrorHandler', because you might want to override the error
296 -- handling, but still get the ordinary cleanup behaviour.
297 defaultCleanupHandler :: DynFlags -> IO a -> IO a
298 defaultCleanupHandler dflags inner =
299 -- make sure we clean up after ourselves
300 later (unless (dopt Opt_KeepTmpFiles dflags) $
301 cleanTempFiles dflags)
302 -- exceptions will be blocked while we clean the temporary files,
303 -- so there shouldn't be any difficulty if we receive further
308 -- | Initialises GHC. This must be done /once/ only. Takes the
309 -- command-line arguments. All command-line arguments which aren't
310 -- understood by GHC will be returned.
312 init :: [String] -> IO [String]
315 main_thread <- myThreadId
316 putMVar interruptTargetThread [main_thread]
317 installSignalHandlers
319 -- Grab the -B option if there is one
320 let (minusB_args, argv1) = partition (prefixMatch "-B") args
321 dflags0 <- initSysTools minusB_args defaultDynFlags
322 writeIORef v_initDynFlags dflags0
324 -- Parse the static flags
325 argv2 <- parseStaticFlags argv1
328 GLOBAL_VAR(v_initDynFlags, error "initDynFlags", DynFlags)
329 -- stores the DynFlags between the call to init and subsequent
330 -- calls to newSession.
332 -- | Starts a new session. A session consists of a set of loaded
333 -- modules, a set of options (DynFlags), and an interactive context.
334 -- ToDo: GhcMode should say "keep typechecked code" and\/or "keep renamed
336 newSession :: GhcMode -> IO Session
338 dflags0 <- readIORef v_initDynFlags
339 dflags <- initDynFlags dflags0
340 env <- newHscEnv dflags{ ghcMode=mode }
344 -- tmp: this breaks the abstraction, but required because DriverMkDepend
345 -- needs to call the Finder. ToDo: untangle this.
346 sessionHscEnv :: Session -> IO HscEnv
347 sessionHscEnv (Session ref) = readIORef ref
349 withSession :: Session -> (HscEnv -> IO a) -> IO a
350 withSession (Session ref) f = do h <- readIORef ref; f h
352 modifySession :: Session -> (HscEnv -> HscEnv) -> IO ()
353 modifySession (Session ref) f = do h <- readIORef ref; writeIORef ref $! f h
355 -- -----------------------------------------------------------------------------
358 -- | Grabs the DynFlags from the Session
359 getSessionDynFlags :: Session -> IO DynFlags
360 getSessionDynFlags s = withSession s (return . hsc_dflags)
362 -- | Updates the DynFlags in a Session
363 setSessionDynFlags :: Session -> DynFlags -> IO ()
364 setSessionDynFlags s dflags = modifySession s (\h -> h{ hsc_dflags = dflags })
366 -- | If there is no -o option, guess the name of target executable
367 -- by using top-level source file name as a base.
368 guessOutputFile :: Session -> IO ()
369 guessOutputFile s = modifySession s $ \env ->
370 let dflags = hsc_dflags env
371 mod_graph = hsc_mod_graph env
372 mainModuleSrcPath, guessedName :: Maybe String
373 mainModuleSrcPath = do
374 let isMain = (== mainModIs dflags) . ms_mod
375 [ms] <- return (filter isMain mod_graph)
376 ml_hs_file (ms_location ms)
377 guessedName = fmap basenameOf mainModuleSrcPath
379 case outputFile dflags of
381 Nothing -> env { hsc_dflags = dflags { outputFile = guessedName } }
383 -- -----------------------------------------------------------------------------
386 -- ToDo: think about relative vs. absolute file paths. And what
387 -- happens when the current directory changes.
389 -- | Sets the targets for this session. Each target may be a module name
390 -- or a filename. The targets correspond to the set of root modules for
391 -- the program\/library. Unloading the current program is achieved by
392 -- setting the current set of targets to be empty, followed by load.
393 setTargets :: Session -> [Target] -> IO ()
394 setTargets s targets = modifySession s (\h -> h{ hsc_targets = targets })
396 -- | returns the current set of targets
397 getTargets :: Session -> IO [Target]
398 getTargets s = withSession s (return . hsc_targets)
400 -- | Add another target
401 addTarget :: Session -> Target -> IO ()
403 = modifySession s (\h -> h{ hsc_targets = target : hsc_targets h })
406 removeTarget :: Session -> TargetId -> IO ()
407 removeTarget s target_id
408 = modifySession s (\h -> h{ hsc_targets = filter (hsc_targets h) })
410 filter targets = [ t | t@(Target id _) <- targets, id /= target_id ]
412 -- Attempts to guess what Target a string refers to. This function implements
413 -- the --make/GHCi command-line syntax for filenames:
415 -- - if the string looks like a Haskell source filename, then interpret
417 -- - if adding a .hs or .lhs suffix yields the name of an existing file,
419 -- - otherwise interpret the string as a module name
421 guessTarget :: String -> Maybe Phase -> IO Target
422 guessTarget file (Just phase)
423 = return (Target (TargetFile file (Just phase)) Nothing)
424 guessTarget file Nothing
425 | isHaskellSrcFilename file
426 = return (Target (TargetFile file Nothing) Nothing)
428 = do exists <- doesFileExist hs_file
430 then return (Target (TargetFile hs_file Nothing) Nothing)
432 exists <- doesFileExist lhs_file
434 then return (Target (TargetFile lhs_file Nothing) Nothing)
436 return (Target (TargetModule (mkModule file)) Nothing)
438 hs_file = file `joinFileExt` "hs"
439 lhs_file = file `joinFileExt` "lhs"
441 -- -----------------------------------------------------------------------------
442 -- Loading the program
444 -- Perform a dependency analysis starting from the current targets
445 -- and update the session with the new module graph.
446 depanal :: Session -> [Module] -> Bool -> IO (Maybe ModuleGraph)
447 depanal (Session ref) excluded_mods allow_dup_roots = do
448 hsc_env <- readIORef ref
450 dflags = hsc_dflags hsc_env
451 gmode = ghcMode (hsc_dflags hsc_env)
452 targets = hsc_targets hsc_env
453 old_graph = hsc_mod_graph hsc_env
455 showPass dflags "Chasing dependencies"
456 when (gmode == BatchCompile) $
457 debugTraceMsg dflags 1 (hcat [
458 text "Chasing modules from: ",
459 hcat (punctuate comma (map pprTarget targets))])
461 r <- downsweep hsc_env old_graph excluded_mods allow_dup_roots
463 Just mod_graph -> writeIORef ref hsc_env{ hsc_mod_graph = mod_graph }
468 -- | The result of load.
470 = LoadOk Errors -- ^ all specified targets were loaded successfully.
471 | LoadFailed Errors -- ^ not all modules were loaded.
473 type Errors = [String]
475 data ErrMsg = ErrMsg {
476 errMsgSeverity :: Severity, -- warning, error, etc.
477 errMsgSpans :: [SrcSpan],
478 errMsgShortDoc :: Doc,
479 errMsgExtraInfo :: Doc
486 | LoadDependenciesOf Module
488 -- | Try to load the program. If a Module is supplied, then just
489 -- attempt to load up to this target. If no Module is supplied,
490 -- then try to load all targets.
491 load :: Session -> LoadHowMuch -> IO SuccessFlag
492 load s@(Session ref) how_much
494 -- Dependency analysis first. Note that this fixes the module graph:
495 -- even if we don't get a fully successful upsweep, the full module
496 -- graph is still retained in the Session. We can tell which modules
497 -- were successfully loaded by inspecting the Session's HPT.
498 mb_graph <- depanal s [] False
500 Just mod_graph -> load2 s how_much mod_graph
501 Nothing -> return Failed
503 load2 s@(Session ref) how_much mod_graph = do
505 hsc_env <- readIORef ref
507 let hpt1 = hsc_HPT hsc_env
508 let dflags = hsc_dflags hsc_env
509 let ghci_mode = ghcMode dflags -- this never changes
511 -- The "bad" boot modules are the ones for which we have
512 -- B.hs-boot in the module graph, but no B.hs
513 -- The downsweep should have ensured this does not happen
515 let all_home_mods = [ms_mod s | s <- mod_graph, not (isBootSummary s)]
517 bad_boot_mods = [s | s <- mod_graph, isBootSummary s,
518 not (ms_mod s `elem` all_home_mods)]
520 ASSERT( null bad_boot_mods ) return ()
522 -- mg2_with_srcimps drops the hi-boot nodes, returning a
523 -- graph with cycles. Among other things, it is used for
524 -- backing out partially complete cycles following a failed
525 -- upsweep, and for removing from hpt all the modules
526 -- not in strict downwards closure, during calls to compile.
527 let mg2_with_srcimps :: [SCC ModSummary]
528 mg2_with_srcimps = topSortModuleGraph True mod_graph Nothing
530 -- check the stability property for each module.
531 stable_mods@(stable_obj,stable_bco)
532 | BatchCompile <- ghci_mode = ([],[])
533 | otherwise = checkStability hpt1 mg2_with_srcimps all_home_mods
535 -- prune bits of the HPT which are definitely redundant now,
537 pruned_hpt = pruneHomePackageTable hpt1
538 (flattenSCCs mg2_with_srcimps)
543 debugTraceMsg dflags 2 (text "Stable obj:" <+> ppr stable_obj $$
544 text "Stable BCO:" <+> ppr stable_bco)
546 -- Unload any modules which are going to be re-linked this time around.
547 let stable_linkables = [ linkable
548 | m <- stable_obj++stable_bco,
549 Just hmi <- [lookupModuleEnv pruned_hpt m],
550 Just linkable <- [hm_linkable hmi] ]
551 unload hsc_env stable_linkables
553 -- We could at this point detect cycles which aren't broken by
554 -- a source-import, and complain immediately, but it seems better
555 -- to let upsweep_mods do this, so at least some useful work gets
556 -- done before the upsweep is abandoned.
557 --hPutStrLn stderr "after tsort:\n"
558 --hPutStrLn stderr (showSDoc (vcat (map ppr mg2)))
560 -- Now do the upsweep, calling compile for each module in
561 -- turn. Final result is version 3 of everything.
563 -- Topologically sort the module graph, this time including hi-boot
564 -- nodes, and possibly just including the portion of the graph
565 -- reachable from the module specified in the 2nd argument to load.
566 -- This graph should be cycle-free.
567 -- If we're restricting the upsweep to a portion of the graph, we
568 -- also want to retain everything that is still stable.
569 let full_mg :: [SCC ModSummary]
570 full_mg = topSortModuleGraph False mod_graph Nothing
572 maybe_top_mod = case how_much of
574 LoadDependenciesOf m -> Just m
577 partial_mg0 :: [SCC ModSummary]
578 partial_mg0 = topSortModuleGraph False mod_graph maybe_top_mod
580 -- LoadDependenciesOf m: we want the upsweep to stop just
581 -- short of the specified module (unless the specified module
584 | LoadDependenciesOf mod <- how_much
585 = ASSERT( case last partial_mg0 of
586 AcyclicSCC ms -> ms_mod ms == mod; _ -> False )
587 List.init partial_mg0
593 | AcyclicSCC ms <- full_mg,
594 ms_mod ms `elem` stable_obj++stable_bco,
595 ms_mod ms `notElem` [ ms_mod ms' |
596 AcyclicSCC ms' <- partial_mg ] ]
598 mg = stable_mg ++ partial_mg
600 -- clean up between compilations
601 let cleanup = cleanTempFilesExcept dflags
602 (ppFilesFromSummaries (flattenSCCs mg2_with_srcimps))
604 (upsweep_ok, hsc_env1, modsUpswept)
605 <- upsweep (hsc_env { hsc_HPT = emptyHomePackageTable })
606 pruned_hpt stable_mods cleanup mg
608 -- Make modsDone be the summaries for each home module now
609 -- available; this should equal the domain of hpt3.
610 -- Get in in a roughly top .. bottom order (hence reverse).
612 let modsDone = reverse modsUpswept
614 -- Try and do linking in some form, depending on whether the
615 -- upsweep was completely or only partially successful.
617 if succeeded upsweep_ok
620 -- Easy; just relink it all.
621 do debugTraceMsg dflags 2 (text "Upsweep completely successful.")
623 -- Clean up after ourselves
624 cleanTempFilesExcept dflags (ppFilesFromSummaries modsDone)
626 -- Issue a warning for the confusing case where the user
627 -- said '-o foo' but we're not going to do any linking.
628 -- We attempt linking if either (a) one of the modules is
629 -- called Main, or (b) the user said -no-hs-main, indicating
630 -- that main() is going to come from somewhere else.
632 let ofile = outputFile dflags
633 let no_hs_main = dopt Opt_NoHsMain dflags
635 main_mod = mainModIs dflags
636 a_root_is_Main = any ((==main_mod).ms_mod) mod_graph
637 do_linking = a_root_is_Main || no_hs_main
639 when (ghci_mode == BatchCompile && isJust ofile && not do_linking) $
640 debugTraceMsg dflags 1 (text ("Warning: output was redirected with -o, " ++
641 "but no output will be generated\n" ++
642 "because there is no " ++ moduleString main_mod ++ " module."))
644 -- link everything together
645 linkresult <- link ghci_mode dflags do_linking (hsc_HPT hsc_env1)
647 loadFinish Succeeded linkresult ref hsc_env1
650 -- Tricky. We need to back out the effects of compiling any
651 -- half-done cycles, both so as to clean up the top level envs
652 -- and to avoid telling the interactive linker to link them.
653 do debugTraceMsg dflags 2 (text "Upsweep partially successful.")
656 = map ms_mod modsDone
657 let mods_to_zap_names
658 = findPartiallyCompletedCycles modsDone_names
661 = filter ((`notElem` mods_to_zap_names).ms_mod)
664 let hpt4 = retainInTopLevelEnvs (map ms_mod mods_to_keep)
667 -- Clean up after ourselves
668 cleanTempFilesExcept dflags (ppFilesFromSummaries mods_to_keep)
670 -- there should be no Nothings where linkables should be, now
671 ASSERT(all (isJust.hm_linkable)
672 (moduleEnvElts (hsc_HPT hsc_env))) do
674 -- Link everything together
675 linkresult <- link ghci_mode dflags False hpt4
677 let hsc_env4 = hsc_env1{ hsc_HPT = hpt4 }
678 loadFinish Failed linkresult ref hsc_env4
680 -- Finish up after a load.
682 -- If the link failed, unload everything and return.
683 loadFinish all_ok Failed ref hsc_env
684 = do unload hsc_env []
685 writeIORef ref $! discardProg hsc_env
688 -- Empty the interactive context and set the module context to the topmost
689 -- newly loaded module, or the Prelude if none were loaded.
690 loadFinish all_ok Succeeded ref hsc_env
691 = do writeIORef ref $! hsc_env{ hsc_IC = emptyInteractiveContext }
695 -- Forget the current program, but retain the persistent info in HscEnv
696 discardProg :: HscEnv -> HscEnv
698 = hsc_env { hsc_mod_graph = emptyMG,
699 hsc_IC = emptyInteractiveContext,
700 hsc_HPT = emptyHomePackageTable }
702 -- used to fish out the preprocess output files for the purposes of
703 -- cleaning up. The preprocessed file *might* be the same as the
704 -- source file, but that doesn't do any harm.
705 ppFilesFromSummaries summaries = [ fn | Just fn <- map ms_hspp_file summaries ]
707 -- -----------------------------------------------------------------------------
711 CheckedModule { parsedSource :: ParsedSource,
712 renamedSource :: Maybe RenamedSource,
713 typecheckedSource :: Maybe TypecheckedSource,
714 checkedModuleInfo :: Maybe ModuleInfo
716 -- ToDo: improvements that could be made here:
717 -- if the module succeeded renaming but not typechecking,
718 -- we can still get back the GlobalRdrEnv and exports, so
719 -- perhaps the ModuleInfo should be split up into separate
720 -- fields within CheckedModule.
722 type ParsedSource = Located (HsModule RdrName)
723 type RenamedSource = HsGroup Name
724 type TypecheckedSource = LHsBinds Id
727 -- - things that aren't in the output of the renamer:
730 -- - things that aren't in the output of the typechecker right now:
734 -- - type/data/newtype declarations
735 -- - class declarations
737 -- - extra things in the typechecker's output:
738 -- - default methods are turned into top-level decls.
739 -- - dictionary bindings
742 -- | This is the way to get access to parsed and typechecked source code
743 -- for a module. 'checkModule' loads all the dependencies of the specified
744 -- module in the Session, and then attempts to typecheck the module. If
745 -- successful, it returns the abstract syntax for the module.
746 checkModule :: Session -> Module -> IO (Maybe CheckedModule)
747 checkModule session@(Session ref) mod = do
748 -- load up the dependencies first
749 r <- load session (LoadDependenciesOf mod)
750 if (failed r) then return Nothing else do
752 -- now parse & typecheck the module
753 hsc_env <- readIORef ref
754 let mg = hsc_mod_graph hsc_env
755 case [ ms | ms <- mg, ms_mod ms == mod ] of
758 -- Add in the OPTIONS from the source file This is nasty:
759 -- we've done this once already, in the compilation manager
760 -- It might be better to cache the flags in the
761 -- ml_hspp_file field, say
762 let dflags0 = hsc_dflags hsc_env
763 hspp_buf = expectJust "GHC.checkModule" (ms_hspp_buf ms)
764 filename = fromJust (ml_hs_file (ms_location ms))
765 opts = getOptionsFromStringBuffer hspp_buf filename
766 (dflags1,leftovers) <- parseDynamicFlags dflags0 (map snd opts)
767 if (not (null leftovers))
768 then do printErrorsAndWarnings dflags1 (optionsErrorMsgs leftovers opts filename)
772 r <- hscFileCheck hsc_env{hsc_dflags=dflags1} ms
776 HscChecked parsed renamed Nothing ->
777 return (Just (CheckedModule {
778 parsedSource = parsed,
779 renamedSource = renamed,
780 typecheckedSource = Nothing,
781 checkedModuleInfo = Nothing }))
782 HscChecked parsed renamed
783 (Just (tc_binds, rdr_env, details)) -> do
784 let minf = ModuleInfo {
785 minf_type_env = md_types details,
786 minf_exports = md_exports details,
787 minf_rdr_env = Just rdr_env,
788 minf_instances = md_insts details
790 return (Just (CheckedModule {
791 parsedSource = parsed,
792 renamedSource = renamed,
793 typecheckedSource = Just tc_binds,
794 checkedModuleInfo = Just minf }))
798 -- ---------------------------------------------------------------------------
801 unload :: HscEnv -> [Linkable] -> IO ()
802 unload hsc_env stable_linkables -- Unload everthing *except* 'stable_linkables'
803 = case ghcMode (hsc_dflags hsc_env) of
804 BatchCompile -> return ()
805 JustTypecheck -> return ()
807 Interactive -> Linker.unload (hsc_dflags hsc_env) stable_linkables
809 Interactive -> panic "unload: no interpreter"
811 other -> panic "unload: strange mode"
813 -- -----------------------------------------------------------------------------
817 Stability tells us which modules definitely do not need to be recompiled.
818 There are two main reasons for having stability:
820 - avoid doing a complete upsweep of the module graph in GHCi when
821 modules near the bottom of the tree have not changed.
823 - to tell GHCi when it can load object code: we can only load object code
824 for a module when we also load object code fo all of the imports of the
825 module. So we need to know that we will definitely not be recompiling
826 any of these modules, and we can use the object code.
828 NB. stability is of no importance to BatchCompile at all, only Interactive.
829 (ToDo: what about JustTypecheck?)
831 The stability check is as follows. Both stableObject and
832 stableBCO are used during the upsweep phase later.
835 stable m = stableObject m || stableBCO m
838 all stableObject (imports m)
839 && old linkable does not exist, or is == on-disk .o
840 && date(on-disk .o) > date(.hs)
843 all stable (imports m)
844 && date(BCO) > date(.hs)
847 These properties embody the following ideas:
849 - if a module is stable:
850 - if it has been compiled in a previous pass (present in HPT)
851 then it does not need to be compiled or re-linked.
852 - if it has not been compiled in a previous pass,
853 then we only need to read its .hi file from disk and
854 link it to produce a ModDetails.
856 - if a modules is not stable, we will definitely be at least
857 re-linking, and possibly re-compiling it during the upsweep.
858 All non-stable modules can (and should) therefore be unlinked
861 - Note that objects are only considered stable if they only depend
862 on other objects. We can't link object code against byte code.
866 :: HomePackageTable -- HPT from last compilation
867 -> [SCC ModSummary] -- current module graph (cyclic)
868 -> [Module] -- all home modules
869 -> ([Module], -- stableObject
870 [Module]) -- stableBCO
872 checkStability hpt sccs all_home_mods = foldl checkSCC ([],[]) sccs
874 checkSCC (stable_obj, stable_bco) scc0
875 | stableObjects = (scc_mods ++ stable_obj, stable_bco)
876 | stableBCOs = (stable_obj, scc_mods ++ stable_bco)
877 | otherwise = (stable_obj, stable_bco)
879 scc = flattenSCC scc0
880 scc_mods = map ms_mod scc
881 home_module m = m `elem` all_home_mods && m `notElem` scc_mods
883 scc_allimps = nub (filter home_module (concatMap ms_allimps scc))
884 -- all imports outside the current SCC, but in the home pkg
886 stable_obj_imps = map (`elem` stable_obj) scc_allimps
887 stable_bco_imps = map (`elem` stable_bco) scc_allimps
894 and (zipWith (||) stable_obj_imps stable_bco_imps)
898 | Just t <- ms_obj_date ms = t >= ms_hs_date ms
902 same_as_prev t = case lookupModuleEnv hpt (ms_mod ms) of
903 Just hmi | Just l <- hm_linkable hmi
904 -> isObjectLinkable l && t == linkableTime l
906 -- why '>=' rather than '>' above? If the filesystem stores
907 -- times to the nearset second, we may occasionally find that
908 -- the object & source have the same modification time,
909 -- especially if the source was automatically generated
910 -- and compiled. Using >= is slightly unsafe, but it matches
914 = case lookupModuleEnv hpt (ms_mod ms) of
915 Just hmi | Just l <- hm_linkable hmi ->
916 not (isObjectLinkable l) &&
917 linkableTime l >= ms_hs_date ms
920 ms_allimps :: ModSummary -> [Module]
921 ms_allimps ms = map unLoc (ms_srcimps ms ++ ms_imps ms)
923 -- -----------------------------------------------------------------------------
924 -- Prune the HomePackageTable
926 -- Before doing an upsweep, we can throw away:
928 -- - For non-stable modules:
929 -- - all ModDetails, all linked code
930 -- - all unlinked code that is out of date with respect to
933 -- This is VERY IMPORTANT otherwise we'll end up requiring 2x the
934 -- space at the end of the upsweep, because the topmost ModDetails of the
935 -- old HPT holds on to the entire type environment from the previous
938 pruneHomePackageTable
941 -> ([Module],[Module])
944 pruneHomePackageTable hpt summ (stable_obj, stable_bco)
945 = mapModuleEnv prune hpt
947 | is_stable modl = hmi'
948 | otherwise = hmi'{ hm_details = emptyModDetails }
950 modl = mi_module (hm_iface hmi)
951 hmi' | Just l <- hm_linkable hmi, linkableTime l < ms_hs_date ms
952 = hmi{ hm_linkable = Nothing }
955 where ms = expectJust "prune" (lookupModuleEnv ms_map modl)
957 ms_map = mkModuleEnv [(ms_mod ms, ms) | ms <- summ]
959 is_stable m = m `elem` stable_obj || m `elem` stable_bco
961 -- -----------------------------------------------------------------------------
963 -- Return (names of) all those in modsDone who are part of a cycle
964 -- as defined by theGraph.
965 findPartiallyCompletedCycles :: [Module] -> [SCC ModSummary] -> [Module]
966 findPartiallyCompletedCycles modsDone theGraph
970 chew ((AcyclicSCC v):rest) = chew rest -- acyclic? not interesting.
971 chew ((CyclicSCC vs):rest)
972 = let names_in_this_cycle = nub (map ms_mod vs)
974 = nub ([done | done <- modsDone,
975 done `elem` names_in_this_cycle])
976 chewed_rest = chew rest
978 if notNull mods_in_this_cycle
979 && length mods_in_this_cycle < length names_in_this_cycle
980 then mods_in_this_cycle ++ chewed_rest
983 -- -----------------------------------------------------------------------------
986 -- This is where we compile each module in the module graph, in a pass
987 -- from the bottom to the top of the graph.
989 -- There better had not be any cyclic groups here -- we check for them.
992 :: HscEnv -- Includes initially-empty HPT
993 -> HomePackageTable -- HPT from last time round (pruned)
994 -> ([Module],[Module]) -- stable modules (see checkStability)
995 -> IO () -- How to clean up unwanted tmp files
996 -> [SCC ModSummary] -- Mods to do (the worklist)
998 HscEnv, -- With an updated HPT
999 [ModSummary]) -- Mods which succeeded
1001 upsweep hsc_env old_hpt stable_mods cleanup mods
1002 = upsweep' hsc_env old_hpt stable_mods cleanup mods 1 (length mods)
1004 upsweep' hsc_env old_hpt stable_mods cleanup
1006 = return (Succeeded, hsc_env, [])
1008 upsweep' hsc_env old_hpt stable_mods cleanup
1009 (CyclicSCC ms:_) _ _
1010 = do fatalErrorMsg (hsc_dflags hsc_env) (cyclicModuleErr ms)
1011 return (Failed, hsc_env, [])
1013 upsweep' hsc_env old_hpt stable_mods cleanup
1014 (AcyclicSCC mod:mods) mod_index nmods
1015 = do -- putStrLn ("UPSWEEP_MOD: hpt = " ++
1016 -- show (map (moduleUserString.moduleName.mi_module.hm_iface)
1017 -- (moduleEnvElts (hsc_HPT hsc_env)))
1019 mb_mod_info <- upsweep_mod hsc_env old_hpt stable_mods mod
1022 cleanup -- Remove unwanted tmp files between compilations
1025 Nothing -> return (Failed, hsc_env, [])
1027 { let this_mod = ms_mod mod
1029 -- Add new info to hsc_env
1030 hpt1 = extendModuleEnv (hsc_HPT hsc_env)
1032 hsc_env1 = hsc_env { hsc_HPT = hpt1 }
1034 -- Space-saving: delete the old HPT entry
1035 -- for mod BUT if mod is a hs-boot
1036 -- node, don't delete it. For the
1037 -- interface, the HPT entry is probaby for the
1038 -- main Haskell source file. Deleting it
1039 -- would force .. (what?? --SDM)
1040 old_hpt1 | isBootSummary mod = old_hpt
1041 | otherwise = delModuleEnv old_hpt this_mod
1043 ; (restOK, hsc_env2, modOKs)
1044 <- upsweep' hsc_env1 old_hpt1 stable_mods cleanup
1045 mods (mod_index+1) nmods
1046 ; return (restOK, hsc_env2, mod:modOKs)
1050 -- Compile a single module. Always produce a Linkable for it if
1051 -- successful. If no compilation happened, return the old Linkable.
1052 upsweep_mod :: HscEnv
1054 -> ([Module],[Module])
1056 -> Int -- index of module
1057 -> Int -- total number of modules
1058 -> IO (Maybe HomeModInfo) -- Nothing => Failed
1060 upsweep_mod hsc_env old_hpt (stable_obj, stable_bco) summary mod_index nmods
1063 this_mod = ms_mod summary
1064 mb_obj_date = ms_obj_date summary
1065 obj_fn = ml_obj_file (ms_location summary)
1066 hs_date = ms_hs_date summary
1068 compile_it :: Maybe Linkable -> IO (Maybe HomeModInfo)
1069 compile_it = upsweep_compile hsc_env old_hpt this_mod
1070 summary mod_index nmods
1072 case ghcMode (hsc_dflags hsc_env) of
1075 -- Batch-compilating is easy: just check whether we have
1076 -- an up-to-date object file. If we do, then the compiler
1077 -- needs to do a recompilation check.
1078 _ | Just obj_date <- mb_obj_date, obj_date >= hs_date -> do
1080 findObjectLinkable this_mod obj_fn obj_date
1081 compile_it (Just linkable)
1088 _ | is_stable_obj, isJust old_hmi ->
1090 -- object is stable, and we have an entry in the
1091 -- old HPT: nothing to do
1093 | is_stable_obj, isNothing old_hmi -> do
1095 findObjectLinkable this_mod obj_fn
1096 (expectJust "upseep1" mb_obj_date)
1097 compile_it (Just linkable)
1098 -- object is stable, but we need to load the interface
1099 -- off disk to make a HMI.
1102 ASSERT(isJust old_hmi) -- must be in the old_hpt
1104 -- BCO is stable: nothing to do
1106 | Just hmi <- old_hmi,
1107 Just l <- hm_linkable hmi, not (isObjectLinkable l),
1108 linkableTime l >= ms_hs_date summary ->
1110 -- we have an old BCO that is up to date with respect
1111 -- to the source: do a recompilation check as normal.
1115 -- no existing code at all: we must recompile.
1117 is_stable_obj = this_mod `elem` stable_obj
1118 is_stable_bco = this_mod `elem` stable_bco
1120 old_hmi = lookupModuleEnv old_hpt this_mod
1122 -- Run hsc to compile a module
1123 upsweep_compile hsc_env old_hpt this_mod summary
1125 mb_old_linkable = do
1127 -- The old interface is ok if it's in the old HPT
1128 -- a) we're compiling a source file, and the old HPT
1129 -- entry is for a source file
1130 -- b) we're compiling a hs-boot file
1131 -- Case (b) allows an hs-boot file to get the interface of its
1132 -- real source file on the second iteration of the compilation
1133 -- manager, but that does no harm. Otherwise the hs-boot file
1134 -- will always be recompiled
1137 = case lookupModuleEnv old_hpt this_mod of
1139 Just hm_info | isBootSummary summary -> Just iface
1140 | not (mi_boot iface) -> Just iface
1141 | otherwise -> Nothing
1143 iface = hm_iface hm_info
1145 compresult <- compile hsc_env summary mb_old_linkable mb_old_iface
1149 -- Compilation failed. Compile may still have updated the PCS, tho.
1150 CompErrs -> return Nothing
1152 -- Compilation "succeeded", and may or may not have returned a new
1153 -- linkable (depending on whether compilation was actually performed
1155 CompOK new_details new_iface new_linkable
1156 -> do let new_info = HomeModInfo { hm_iface = new_iface,
1157 hm_details = new_details,
1158 hm_linkable = new_linkable }
1159 return (Just new_info)
1162 -- Filter modules in the HPT
1163 retainInTopLevelEnvs :: [Module] -> HomePackageTable -> HomePackageTable
1164 retainInTopLevelEnvs keep_these hpt
1165 = mkModuleEnv [ (mod, expectJust "retain" mb_mod_info)
1167 , let mb_mod_info = lookupModuleEnv hpt mod
1168 , isJust mb_mod_info ]
1170 -- ---------------------------------------------------------------------------
1171 -- Topological sort of the module graph
1174 :: Bool -- Drop hi-boot nodes? (see below)
1178 -- Calculate SCCs of the module graph, possibly dropping the hi-boot nodes
1179 -- The resulting list of strongly-connected-components is in topologically
1180 -- sorted order, starting with the module(s) at the bottom of the
1181 -- dependency graph (ie compile them first) and ending with the ones at
1184 -- Drop hi-boot nodes (first boolean arg)?
1186 -- False: treat the hi-boot summaries as nodes of the graph,
1187 -- so the graph must be acyclic
1189 -- True: eliminate the hi-boot nodes, and instead pretend
1190 -- the a source-import of Foo is an import of Foo
1191 -- The resulting graph has no hi-boot nodes, but can by cyclic
1193 topSortModuleGraph drop_hs_boot_nodes summaries Nothing
1194 = stronglyConnComp (fst (moduleGraphNodes drop_hs_boot_nodes summaries))
1195 topSortModuleGraph drop_hs_boot_nodes summaries (Just mod)
1196 = stronglyConnComp (map vertex_fn (reachable graph root))
1198 -- restrict the graph to just those modules reachable from
1199 -- the specified module. We do this by building a graph with
1200 -- the full set of nodes, and determining the reachable set from
1201 -- the specified node.
1202 (nodes, lookup_key) = moduleGraphNodes drop_hs_boot_nodes summaries
1203 (graph, vertex_fn, key_fn) = graphFromEdges' nodes
1205 | Just key <- lookup_key HsSrcFile mod, Just v <- key_fn key = v
1206 | otherwise = throwDyn (ProgramError "module does not exist")
1208 moduleGraphNodes :: Bool -> [ModSummary]
1209 -> ([(ModSummary, Int, [Int])], HscSource -> Module -> Maybe Int)
1210 moduleGraphNodes drop_hs_boot_nodes summaries = (nodes, lookup_key)
1212 -- Drop hs-boot nodes by using HsSrcFile as the key
1213 hs_boot_key | drop_hs_boot_nodes = HsSrcFile
1214 | otherwise = HsBootFile
1216 -- We use integers as the keys for the SCC algorithm
1217 nodes :: [(ModSummary, Int, [Int])]
1218 nodes = [(s, expectJust "topSort" (lookup_key (ms_hsc_src s) (ms_mod s)),
1219 out_edge_keys hs_boot_key (map unLoc (ms_srcimps s)) ++
1220 out_edge_keys HsSrcFile (map unLoc (ms_imps s)) )
1222 , not (isBootSummary s && drop_hs_boot_nodes) ]
1223 -- Drop the hi-boot ones if told to do so
1225 key_map :: NodeMap Int
1226 key_map = listToFM ([(ms_mod s, ms_hsc_src s) | s <- summaries]
1229 lookup_key :: HscSource -> Module -> Maybe Int
1230 lookup_key hs_src mod = lookupFM key_map (mod, hs_src)
1232 out_edge_keys :: HscSource -> [Module] -> [Int]
1233 out_edge_keys hi_boot ms = mapCatMaybes (lookup_key hi_boot) ms
1234 -- If we want keep_hi_boot_nodes, then we do lookup_key with
1235 -- the IsBootInterface parameter True; else False
1238 type NodeKey = (Module, HscSource) -- The nodes of the graph are
1239 type NodeMap a = FiniteMap NodeKey a -- keyed by (mod, src_file_type) pairs
1241 msKey :: ModSummary -> NodeKey
1242 msKey (ModSummary { ms_mod = mod, ms_hsc_src = boot }) = (mod,boot)
1244 mkNodeMap :: [ModSummary] -> NodeMap ModSummary
1245 mkNodeMap summaries = listToFM [ (msKey s, s) | s <- summaries]
1247 nodeMapElts :: NodeMap a -> [a]
1248 nodeMapElts = eltsFM
1250 -----------------------------------------------------------------------------
1251 -- Downsweep (dependency analysis)
1253 -- Chase downwards from the specified root set, returning summaries
1254 -- for all home modules encountered. Only follow source-import
1257 -- We pass in the previous collection of summaries, which is used as a
1258 -- cache to avoid recalculating a module summary if the source is
1261 -- The returned list of [ModSummary] nodes has one node for each home-package
1262 -- module, plus one for any hs-boot files. The imports of these nodes
1263 -- are all there, including the imports of non-home-package modules.
1266 -> [ModSummary] -- Old summaries
1267 -> [Module] -- Ignore dependencies on these; treat
1268 -- them as if they were package modules
1269 -> Bool -- True <=> allow multiple targets to have
1270 -- the same module name; this is
1271 -- very useful for ghc -M
1272 -> IO (Maybe [ModSummary])
1273 -- The elts of [ModSummary] all have distinct
1274 -- (Modules, IsBoot) identifiers, unless the Bool is true
1275 -- in which case there can be repeats
1276 downsweep hsc_env old_summaries excl_mods allow_dup_roots
1277 = -- catch error messages and return them
1278 handleDyn (\err_msg -> printBagOfErrors (hsc_dflags hsc_env) (unitBag err_msg) >> return Nothing) $ do
1279 rootSummaries <- mapM getRootSummary roots
1280 let root_map = mkRootMap rootSummaries
1281 checkDuplicates root_map
1282 summs <- loop (concatMap msDeps rootSummaries) root_map
1285 roots = hsc_targets hsc_env
1287 old_summary_map :: NodeMap ModSummary
1288 old_summary_map = mkNodeMap old_summaries
1290 getRootSummary :: Target -> IO ModSummary
1291 getRootSummary (Target (TargetFile file mb_phase) maybe_buf)
1292 = do exists <- doesFileExist file
1294 then summariseFile hsc_env old_summaries file mb_phase maybe_buf
1295 else throwDyn $ mkPlainErrMsg noSrcSpan $
1296 text "can't find file:" <+> text file
1297 getRootSummary (Target (TargetModule modl) maybe_buf)
1298 = do maybe_summary <- summariseModule hsc_env old_summary_map False
1299 (L rootLoc modl) maybe_buf excl_mods
1300 case maybe_summary of
1301 Nothing -> packageModErr modl
1304 rootLoc = mkGeneralSrcSpan FSLIT("<command line>")
1306 -- In a root module, the filename is allowed to diverge from the module
1307 -- name, so we have to check that there aren't multiple root files
1308 -- defining the same module (otherwise the duplicates will be silently
1309 -- ignored, leading to confusing behaviour).
1310 checkDuplicates :: NodeMap [ModSummary] -> IO ()
1311 checkDuplicates root_map
1312 | allow_dup_roots = return ()
1313 | null dup_roots = return ()
1314 | otherwise = multiRootsErr (head dup_roots)
1316 dup_roots :: [[ModSummary]] -- Each at least of length 2
1317 dup_roots = filterOut isSingleton (nodeMapElts root_map)
1319 loop :: [(Located Module,IsBootInterface)]
1320 -- Work list: process these modules
1321 -> NodeMap [ModSummary]
1322 -- Visited set; the range is a list because
1323 -- the roots can have the same module names
1324 -- if allow_dup_roots is True
1326 -- The result includes the worklist, except
1327 -- for those mentioned in the visited set
1328 loop [] done = return (concat (nodeMapElts done))
1329 loop ((wanted_mod, is_boot) : ss) done
1330 | Just summs <- lookupFM done key
1331 = if isSingleton summs then
1334 do { multiRootsErr summs; return [] }
1335 | otherwise = do { mb_s <- summariseModule hsc_env old_summary_map
1336 is_boot wanted_mod Nothing excl_mods
1338 Nothing -> loop ss done
1339 Just s -> loop (msDeps s ++ ss)
1340 (addToFM done key [s]) }
1342 key = (unLoc wanted_mod, if is_boot then HsBootFile else HsSrcFile)
1344 mkRootMap :: [ModSummary] -> NodeMap [ModSummary]
1345 mkRootMap summaries = addListToFM_C (++) emptyFM
1346 [ (msKey s, [s]) | s <- summaries ]
1348 msDeps :: ModSummary -> [(Located Module, IsBootInterface)]
1349 -- (msDeps s) returns the dependencies of the ModSummary s.
1350 -- A wrinkle is that for a {-# SOURCE #-} import we return
1351 -- *both* the hs-boot file
1352 -- *and* the source file
1353 -- as "dependencies". That ensures that the list of all relevant
1354 -- modules always contains B.hs if it contains B.hs-boot.
1355 -- Remember, this pass isn't doing the topological sort. It's
1356 -- just gathering the list of all relevant ModSummaries
1358 concat [ [(m,True), (m,False)] | m <- ms_srcimps s ]
1359 ++ [ (m,False) | m <- ms_imps s ]
1361 -----------------------------------------------------------------------------
1362 -- Summarising modules
1364 -- We have two types of summarisation:
1366 -- * Summarise a file. This is used for the root module(s) passed to
1367 -- cmLoadModules. The file is read, and used to determine the root
1368 -- module name. The module name may differ from the filename.
1370 -- * Summarise a module. We are given a module name, and must provide
1371 -- a summary. The finder is used to locate the file in which the module
1376 -> [ModSummary] -- old summaries
1377 -> FilePath -- source file name
1378 -> Maybe Phase -- start phase
1379 -> Maybe (StringBuffer,ClockTime)
1382 summariseFile hsc_env old_summaries file mb_phase maybe_buf
1383 -- we can use a cached summary if one is available and the
1384 -- source file hasn't changed, But we have to look up the summary
1385 -- by source file, rather than module name as we do in summarise.
1386 | Just old_summary <- findSummaryBySourceFile old_summaries file
1388 let location = ms_location old_summary
1390 -- return the cached summary if the source didn't change
1391 src_timestamp <- case maybe_buf of
1392 Just (_,t) -> return t
1393 Nothing -> getModificationTime file
1394 -- The file exists; we checked in getRootSummary above.
1395 -- If it gets removed subsequently, then this
1396 -- getModificationTime may fail, but that's the right
1399 if ms_hs_date old_summary == src_timestamp
1400 then do -- update the object-file timestamp
1401 obj_timestamp <- getObjTimestamp location False
1402 return old_summary{ ms_obj_date = obj_timestamp }
1410 let dflags = hsc_dflags hsc_env
1412 (dflags', hspp_fn, buf)
1413 <- preprocessFile dflags file mb_phase maybe_buf
1415 (srcimps,the_imps, L _ mod) <- getImports dflags' buf hspp_fn
1417 -- Make a ModLocation for this file
1418 location <- mkHomeModLocation dflags mod file
1420 -- Tell the Finder cache where it is, so that subsequent calls
1421 -- to findModule will find it, even if it's not on any search path
1422 addHomeModuleToFinder hsc_env mod location
1424 src_timestamp <- case maybe_buf of
1425 Just (_,t) -> return t
1426 Nothing -> getModificationTime file
1427 -- getMofificationTime may fail
1429 obj_timestamp <- modificationTimeIfExists (ml_obj_file location)
1431 return (ModSummary { ms_mod = mod, ms_hsc_src = HsSrcFile,
1432 ms_location = location,
1433 ms_hspp_file = Just hspp_fn,
1434 ms_hspp_buf = Just buf,
1435 ms_srcimps = srcimps, ms_imps = the_imps,
1436 ms_hs_date = src_timestamp,
1437 ms_obj_date = obj_timestamp })
1439 findSummaryBySourceFile :: [ModSummary] -> FilePath -> Maybe ModSummary
1440 findSummaryBySourceFile summaries file
1441 = case [ ms | ms <- summaries, HsSrcFile <- [ms_hsc_src ms],
1442 fromJust (ml_hs_file (ms_location ms)) == file ] of
1446 -- Summarise a module, and pick up source and timestamp.
1449 -> NodeMap ModSummary -- Map of old summaries
1450 -> IsBootInterface -- True <=> a {-# SOURCE #-} import
1451 -> Located Module -- Imported module to be summarised
1452 -> Maybe (StringBuffer, ClockTime)
1453 -> [Module] -- Modules to exclude
1454 -> IO (Maybe ModSummary) -- Its new summary
1456 summariseModule hsc_env old_summary_map is_boot (L loc wanted_mod) maybe_buf excl_mods
1457 | wanted_mod `elem` excl_mods
1460 | Just old_summary <- lookupFM old_summary_map (wanted_mod, hsc_src)
1461 = do -- Find its new timestamp; all the
1462 -- ModSummaries in the old map have valid ml_hs_files
1463 let location = ms_location old_summary
1464 src_fn = expectJust "summariseModule" (ml_hs_file location)
1466 -- check the modification time on the source file, and
1467 -- return the cached summary if it hasn't changed. If the
1468 -- file has disappeared, we need to call the Finder again.
1470 Just (_,t) -> check_timestamp old_summary location src_fn t
1472 m <- System.IO.Error.try (getModificationTime src_fn)
1474 Right t -> check_timestamp old_summary location src_fn t
1475 Left e | isDoesNotExistError e -> find_it
1476 | otherwise -> ioError e
1478 | otherwise = find_it
1480 dflags = hsc_dflags hsc_env
1482 hsc_src = if is_boot then HsBootFile else HsSrcFile
1484 check_timestamp old_summary location src_fn src_timestamp
1485 | ms_hs_date old_summary == src_timestamp = do
1486 -- update the object-file timestamp
1487 obj_timestamp <- getObjTimestamp location is_boot
1488 return (Just old_summary{ ms_obj_date = obj_timestamp })
1490 -- source changed: find and re-summarise. We call the finder
1491 -- again, because the user may have moved the source file.
1492 new_summary location src_fn src_timestamp
1495 -- Don't use the Finder's cache this time. If the module was
1496 -- previously a package module, it may have now appeared on the
1497 -- search path, so we want to consider it to be a home module. If
1498 -- the module was previously a home module, it may have moved.
1499 uncacheModule hsc_env wanted_mod
1500 found <- findModule hsc_env wanted_mod True {-explicit-}
1503 | not (isHomePackage pkg) -> return Nothing
1504 -- Drop external-pkg
1505 | isJust (ml_hs_file location) -> just_found location
1507 err -> noModError dflags loc wanted_mod err
1510 just_found location = do
1511 -- Adjust location to point to the hs-boot source file,
1512 -- hi file, object file, when is_boot says so
1513 let location' | is_boot = addBootSuffixLocn location
1514 | otherwise = location
1515 src_fn = expectJust "summarise2" (ml_hs_file location')
1517 -- Check that it exists
1518 -- It might have been deleted since the Finder last found it
1519 maybe_t <- modificationTimeIfExists src_fn
1521 Nothing -> noHsFileErr loc src_fn
1522 Just t -> new_summary location' src_fn t
1525 new_summary location src_fn src_timestamp
1527 -- Preprocess the source file and get its imports
1528 -- The dflags' contains the OPTIONS pragmas
1529 (dflags', hspp_fn, buf) <- preprocessFile dflags src_fn Nothing maybe_buf
1530 (srcimps, the_imps, L mod_loc mod_name) <- getImports dflags' buf hspp_fn
1532 when (mod_name /= wanted_mod) $
1533 throwDyn $ mkPlainErrMsg mod_loc $
1534 text "file name does not match module name"
1535 <+> quotes (ppr mod_name)
1537 -- Find the object timestamp, and return the summary
1538 obj_timestamp <- getObjTimestamp location is_boot
1540 return (Just ( ModSummary { ms_mod = wanted_mod,
1541 ms_hsc_src = hsc_src,
1542 ms_location = location,
1543 ms_hspp_file = Just hspp_fn,
1544 ms_hspp_buf = Just buf,
1545 ms_srcimps = srcimps,
1547 ms_hs_date = src_timestamp,
1548 ms_obj_date = obj_timestamp }))
1551 getObjTimestamp location is_boot
1552 = if is_boot then return Nothing
1553 else modificationTimeIfExists (ml_obj_file location)
1556 preprocessFile :: DynFlags -> FilePath -> Maybe Phase -> Maybe (StringBuffer,ClockTime)
1557 -> IO (DynFlags, FilePath, StringBuffer)
1558 preprocessFile dflags src_fn mb_phase Nothing
1560 (dflags', hspp_fn) <- preprocess dflags (src_fn, mb_phase)
1561 buf <- hGetStringBuffer hspp_fn
1562 return (dflags', hspp_fn, buf)
1564 preprocessFile dflags src_fn mb_phase (Just (buf, time))
1566 -- case we bypass the preprocessing stage?
1568 local_opts = getOptionsFromStringBuffer buf src_fn
1570 (dflags', errs) <- parseDynamicFlags dflags (map snd local_opts)
1574 | Just (Unlit _) <- mb_phase = True
1575 | Nothing <- mb_phase, Unlit _ <- startPhase src_fn = True
1576 -- note: local_opts is only required if there's no Unlit phase
1577 | dopt Opt_Cpp dflags' = True
1578 | dopt Opt_Pp dflags' = True
1581 when needs_preprocessing $
1582 ghcError (ProgramError "buffer needs preprocesing; interactive check disabled")
1584 return (dflags', src_fn, buf)
1587 -----------------------------------------------------------------------------
1589 -----------------------------------------------------------------------------
1591 noModError :: DynFlags -> SrcSpan -> Module -> FindResult -> IO ab
1592 -- ToDo: we don't have a proper line number for this error
1593 noModError dflags loc wanted_mod err
1594 = throwDyn $ mkPlainErrMsg loc $ cantFindError dflags wanted_mod err
1596 noHsFileErr loc path
1597 = throwDyn $ mkPlainErrMsg loc $ text "Can't find" <+> text path
1600 = throwDyn $ mkPlainErrMsg noSrcSpan $
1601 text "module" <+> quotes (ppr mod) <+> text "is a package module"
1603 multiRootsErr :: [ModSummary] -> IO ()
1604 multiRootsErr summs@(summ1:_)
1605 = throwDyn $ mkPlainErrMsg noSrcSpan $
1606 text "module" <+> quotes (ppr mod) <+>
1607 text "is defined in multiple files:" <+>
1608 sep (map text files)
1611 files = map (expectJust "checkDup" . ml_hs_file . ms_location) summs
1613 cyclicModuleErr :: [ModSummary] -> SDoc
1615 = hang (ptext SLIT("Module imports form a cycle for modules:"))
1616 2 (vcat (map show_one ms))
1618 show_one ms = sep [ show_mod (ms_hsc_src ms) (ms_mod ms),
1619 nest 2 $ ptext SLIT("imports:") <+>
1620 (pp_imps HsBootFile (ms_srcimps ms)
1621 $$ pp_imps HsSrcFile (ms_imps ms))]
1622 show_mod hsc_src mod = ppr mod <> text (hscSourceString hsc_src)
1623 pp_imps src mods = fsep (map (show_mod src) mods)
1626 -- | Inform GHC that the working directory has changed. GHC will flush
1627 -- its cache of module locations, since it may no longer be valid.
1628 -- Note: if you change the working directory, you should also unload
1629 -- the current program (set targets to empty, followed by load).
1630 workingDirectoryChanged :: Session -> IO ()
1631 workingDirectoryChanged s = withSession s $ \hsc_env ->
1632 flushFinderCache (hsc_FC hsc_env)
1634 -- -----------------------------------------------------------------------------
1635 -- inspecting the session
1637 -- | Get the module dependency graph.
1638 getModuleGraph :: Session -> IO ModuleGraph -- ToDo: DiGraph ModSummary
1639 getModuleGraph s = withSession s (return . hsc_mod_graph)
1641 isLoaded :: Session -> Module -> IO Bool
1642 isLoaded s m = withSession s $ \hsc_env ->
1643 return $! isJust (lookupModuleEnv (hsc_HPT hsc_env) m)
1645 getBindings :: Session -> IO [TyThing]
1646 getBindings s = withSession s (return . nameEnvElts . ic_type_env . hsc_IC)
1648 getPrintUnqual :: Session -> IO PrintUnqualified
1649 getPrintUnqual s = withSession s (return . icPrintUnqual . hsc_IC)
1651 -- | Container for information about a 'Module'.
1652 data ModuleInfo = ModuleInfo {
1653 minf_type_env :: TypeEnv,
1654 minf_exports :: NameSet,
1655 minf_rdr_env :: Maybe GlobalRdrEnv, -- Nothing for a compiled/package mod
1656 minf_instances :: [Instance]
1657 -- ToDo: this should really contain the ModIface too
1659 -- We don't want HomeModInfo here, because a ModuleInfo applies
1660 -- to package modules too.
1662 -- | Request information about a loaded 'Module'
1663 getModuleInfo :: Session -> Module -> IO (Maybe ModuleInfo)
1664 getModuleInfo s mdl = withSession s $ \hsc_env -> do
1665 let mg = hsc_mod_graph hsc_env
1666 if mdl `elem` map ms_mod mg
1667 then getHomeModuleInfo hsc_env mdl
1669 {- if isHomeModule (hsc_dflags hsc_env) mdl
1671 else -} getPackageModuleInfo hsc_env mdl
1672 -- getPackageModuleInfo will attempt to find the interface, so
1673 -- we don't want to call it for a home module, just in case there
1674 -- was a problem loading the module and the interface doesn't
1675 -- exist... hence the isHomeModule test here. (ToDo: reinstate)
1677 getPackageModuleInfo :: HscEnv -> Module -> IO (Maybe ModuleInfo)
1678 getPackageModuleInfo hsc_env mdl = do
1680 (_msgs, mb_names) <- getModuleExports hsc_env mdl
1682 Nothing -> return Nothing
1684 eps <- readIORef (hsc_EPS hsc_env)
1687 n_list = nameSetToList names
1688 tys = [ ty | name <- n_list,
1689 Just ty <- [lookupTypeEnv pte name] ]
1691 return (Just (ModuleInfo {
1692 minf_type_env = mkTypeEnv tys,
1693 minf_exports = names,
1694 minf_rdr_env = Just $! nameSetToGlobalRdrEnv names mdl,
1695 minf_instances = error "getModuleInfo: instances for package module unimplemented"
1698 -- bogusly different for non-GHCI (ToDo)
1702 getHomeModuleInfo hsc_env mdl =
1703 case lookupModuleEnv (hsc_HPT hsc_env) mdl of
1704 Nothing -> return Nothing
1706 let details = hm_details hmi
1707 return (Just (ModuleInfo {
1708 minf_type_env = md_types details,
1709 minf_exports = md_exports details,
1710 minf_rdr_env = mi_globals $! hm_iface hmi,
1711 minf_instances = md_insts details
1714 -- | The list of top-level entities defined in a module
1715 modInfoTyThings :: ModuleInfo -> [TyThing]
1716 modInfoTyThings minf = typeEnvElts (minf_type_env minf)
1718 modInfoTopLevelScope :: ModuleInfo -> Maybe [Name]
1719 modInfoTopLevelScope minf
1720 = fmap (map gre_name . globalRdrEnvElts) (minf_rdr_env minf)
1722 modInfoExports :: ModuleInfo -> [Name]
1723 modInfoExports minf = nameSetToList $! minf_exports minf
1725 -- | Returns the instances defined by the specified module.
1726 -- Warning: currently unimplemented for package modules.
1727 modInfoInstances :: ModuleInfo -> [Instance]
1728 modInfoInstances = minf_instances
1730 modInfoIsExportedName :: ModuleInfo -> Name -> Bool
1731 modInfoIsExportedName minf name = elemNameSet name (minf_exports minf)
1733 modInfoPrintUnqualified :: ModuleInfo -> Maybe PrintUnqualified
1734 modInfoPrintUnqualified minf = fmap unQualInScope (minf_rdr_env minf)
1736 modInfoLookupName :: Session -> ModuleInfo -> Name -> IO (Maybe TyThing)
1737 modInfoLookupName s minf name = withSession s $ \hsc_env -> do
1738 case lookupTypeEnv (minf_type_env minf) name of
1739 Just tyThing -> return (Just tyThing)
1741 eps <- readIORef (hsc_EPS hsc_env)
1742 return $! lookupType (hsc_HPT hsc_env) (eps_PTE eps) name
1744 isDictonaryId :: Id -> Bool
1746 = case tcSplitSigmaTy (idType id) of { (tvs, theta, tau) -> isDictTy tau }
1748 -- | Looks up a global name: that is, any top-level name in any
1749 -- visible module. Unlike 'lookupName', lookupGlobalName does not use
1750 -- the interactive context, and therefore does not require a preceding
1752 lookupGlobalName :: Session -> Name -> IO (Maybe TyThing)
1753 lookupGlobalName s name = withSession s $ \hsc_env -> do
1754 eps <- readIORef (hsc_EPS hsc_env)
1755 return $! lookupType (hsc_HPT hsc_env) (eps_PTE eps) name
1757 -- -----------------------------------------------------------------------------
1758 -- Misc exported utils
1760 dataConType :: DataCon -> Type
1761 dataConType dc = idType (dataConWrapId dc)
1763 -- | print a 'NamedThing', adding parentheses if the name is an operator.
1764 pprParenSymName :: NamedThing a => a -> SDoc
1765 pprParenSymName a = parenSymOcc (getOccName a) (ppr (getName a))
1767 -- ----------------------------------------------------------------------------
1772 -- - Data and Typeable instances for HsSyn.
1774 -- ToDo: check for small transformations that happen to the syntax in
1775 -- the typechecker (eg. -e ==> negate e, perhaps for fromIntegral)
1777 -- ToDo: maybe use TH syntax instead of IfaceSyn? There's already a way
1778 -- to get from TyCons, Ids etc. to TH syntax (reify).
1780 -- :browse will use either lm_toplev or inspect lm_interface, depending
1781 -- on whether the module is interpreted or not.
1783 -- This is for reconstructing refactored source code
1784 -- Calls the lexer repeatedly.
1785 -- ToDo: add comment tokens to token stream
1786 getTokenStream :: Session -> Module -> IO [Located Token]
1789 -- -----------------------------------------------------------------------------
1790 -- Interactive evaluation
1794 -- | Set the interactive evaluation context.
1796 -- Setting the context doesn't throw away any bindings; the bindings
1797 -- we've built up in the InteractiveContext simply move to the new
1798 -- module. They always shadow anything in scope in the current context.
1799 setContext :: Session
1800 -> [Module] -- entire top level scope of these modules
1801 -> [Module] -- exports only of these modules
1803 setContext (Session ref) toplevs exports = do
1804 hsc_env <- readIORef ref
1805 let old_ic = hsc_IC hsc_env
1806 hpt = hsc_HPT hsc_env
1808 mapM_ (checkModuleExists hsc_env hpt) exports
1809 export_env <- mkExportEnv hsc_env exports
1810 toplev_envs <- mapM (mkTopLevEnv hpt) toplevs
1811 let all_env = foldr plusGlobalRdrEnv export_env toplev_envs
1812 writeIORef ref hsc_env{ hsc_IC = old_ic { ic_toplev_scope = toplevs,
1813 ic_exports = exports,
1814 ic_rn_gbl_env = all_env }}
1817 -- Make a GlobalRdrEnv based on the exports of the modules only.
1818 mkExportEnv :: HscEnv -> [Module] -> IO GlobalRdrEnv
1819 mkExportEnv hsc_env mods = do
1820 stuff <- mapM (getModuleExports hsc_env) mods
1822 (_msgs, mb_name_sets) = unzip stuff
1823 gres = [ nameSetToGlobalRdrEnv name_set mod
1824 | (Just name_set, mod) <- zip mb_name_sets mods ]
1826 return $! foldr plusGlobalRdrEnv emptyGlobalRdrEnv gres
1828 nameSetToGlobalRdrEnv :: NameSet -> Module -> GlobalRdrEnv
1829 nameSetToGlobalRdrEnv names mod =
1830 mkGlobalRdrEnv [ GRE { gre_name = name, gre_prov = vanillaProv mod }
1831 | name <- nameSetToList names ]
1833 vanillaProv :: Module -> Provenance
1834 -- We're building a GlobalRdrEnv as if the user imported
1835 -- all the specified modules into the global interactive module
1836 vanillaProv mod = Imported [ImpSpec { is_decl = decl, is_item = ImpAll}]
1838 decl = ImpDeclSpec { is_mod = mod, is_as = mod,
1840 is_dloc = srcLocSpan interactiveSrcLoc }
1842 checkModuleExists :: HscEnv -> HomePackageTable -> Module -> IO ()
1843 checkModuleExists hsc_env hpt mod =
1844 case lookupModuleEnv hpt mod of
1845 Just mod_info -> return ()
1846 _not_a_home_module -> do
1847 res <- findPackageModule hsc_env mod True
1849 Found _ _ -> return ()
1850 err -> let msg = cantFindError (hsc_dflags hsc_env) mod err in
1851 throwDyn (CmdLineError (showSDoc msg))
1853 mkTopLevEnv :: HomePackageTable -> Module -> IO GlobalRdrEnv
1854 mkTopLevEnv hpt modl
1855 = case lookupModuleEnv hpt modl of
1857 throwDyn (ProgramError ("mkTopLevEnv: not a home module "
1858 ++ showSDoc (pprModule modl)))
1860 case mi_globals (hm_iface details) of
1862 throwDyn (ProgramError ("mkTopLevEnv: not interpreted "
1863 ++ showSDoc (pprModule modl)))
1864 Just env -> return env
1866 -- | Get the interactive evaluation context, consisting of a pair of the
1867 -- set of modules from which we take the full top-level scope, and the set
1868 -- of modules from which we take just the exports respectively.
1869 getContext :: Session -> IO ([Module],[Module])
1870 getContext s = withSession s (\HscEnv{ hsc_IC=ic } ->
1871 return (ic_toplev_scope ic, ic_exports ic))
1873 -- | Returns 'True' if the specified module is interpreted, and hence has
1874 -- its full top-level scope available.
1875 moduleIsInterpreted :: Session -> Module -> IO Bool
1876 moduleIsInterpreted s modl = withSession s $ \h ->
1877 case lookupModuleEnv (hsc_HPT h) modl of
1878 Just details -> return (isJust (mi_globals (hm_iface details)))
1879 _not_a_home_module -> return False
1881 -- | Looks up an identifier in the current interactive context (for :info)
1882 getInfo :: Session -> Name -> IO (Maybe (TyThing,Fixity,[Instance]))
1883 getInfo s name = withSession s $ \hsc_env -> tcRnGetInfo hsc_env name
1885 -- | Returns all names in scope in the current interactive context
1886 getNamesInScope :: Session -> IO [Name]
1887 getNamesInScope s = withSession s $ \hsc_env -> do
1888 return (map gre_name (globalRdrEnvElts (ic_rn_gbl_env (hsc_IC hsc_env))))
1890 -- | Parses a string as an identifier, and returns the list of 'Name's that
1891 -- the identifier can refer to in the current interactive context.
1892 parseName :: Session -> String -> IO [Name]
1893 parseName s str = withSession s $ \hsc_env -> do
1894 maybe_rdr_name <- hscParseIdentifier (hsc_dflags hsc_env) str
1895 case maybe_rdr_name of
1896 Nothing -> return []
1897 Just (L _ rdr_name) -> do
1898 mb_names <- tcRnLookupRdrName hsc_env rdr_name
1900 Nothing -> return []
1901 Just ns -> return ns
1902 -- ToDo: should return error messages
1904 -- | Returns the 'TyThing' for a 'Name'. The 'Name' may refer to any
1905 -- entity known to GHC, including 'Name's defined using 'runStmt'.
1906 lookupName :: Session -> Name -> IO (Maybe TyThing)
1907 lookupName s name = withSession s $ \hsc_env -> tcRnLookupName hsc_env name
1909 -- -----------------------------------------------------------------------------
1910 -- Getting the type of an expression
1912 -- | Get the type of an expression
1913 exprType :: Session -> String -> IO (Maybe Type)
1914 exprType s expr = withSession s $ \hsc_env -> do
1915 maybe_stuff <- hscTcExpr hsc_env expr
1917 Nothing -> return Nothing
1918 Just ty -> return (Just tidy_ty)
1920 tidy_ty = tidyType emptyTidyEnv ty
1922 -- -----------------------------------------------------------------------------
1923 -- Getting the kind of a type
1925 -- | Get the kind of a type
1926 typeKind :: Session -> String -> IO (Maybe Kind)
1927 typeKind s str = withSession s $ \hsc_env -> do
1928 maybe_stuff <- hscKcType hsc_env str
1930 Nothing -> return Nothing
1931 Just kind -> return (Just kind)
1933 -----------------------------------------------------------------------------
1934 -- cmCompileExpr: compile an expression and deliver an HValue
1936 compileExpr :: Session -> String -> IO (Maybe HValue)
1937 compileExpr s expr = withSession s $ \hsc_env -> do
1938 maybe_stuff <- hscStmt hsc_env ("let __cmCompileExpr = "++expr)
1940 Nothing -> return Nothing
1941 Just (new_ic, names, hval) -> do
1943 hvals <- (unsafeCoerce# hval) :: IO [HValue]
1945 case (names,hvals) of
1946 ([n],[hv]) -> return (Just hv)
1947 _ -> panic "compileExpr"
1949 -- -----------------------------------------------------------------------------
1950 -- running a statement interactively
1953 = RunOk [Name] -- ^ names bound by this evaluation
1954 | RunFailed -- ^ statement failed compilation
1955 | RunException Exception -- ^ statement raised an exception
1957 -- | Run a statement in the current interactive context. Statemenet
1958 -- may bind multple values.
1959 runStmt :: Session -> String -> IO RunResult
1960 runStmt (Session ref) expr
1962 hsc_env <- readIORef ref
1964 -- Turn off -fwarn-unused-bindings when running a statement, to hide
1965 -- warnings about the implicit bindings we introduce.
1966 let dflags' = dopt_unset (hsc_dflags hsc_env) Opt_WarnUnusedBinds
1967 hsc_env' = hsc_env{ hsc_dflags = dflags' }
1969 maybe_stuff <- hscStmt hsc_env' expr
1972 Nothing -> return RunFailed
1973 Just (new_hsc_env, names, hval) -> do
1975 let thing_to_run = unsafeCoerce# hval :: IO [HValue]
1976 either_hvals <- sandboxIO thing_to_run
1978 case either_hvals of
1980 -- on error, keep the *old* interactive context,
1981 -- so that 'it' is not bound to something
1982 -- that doesn't exist.
1983 return (RunException e)
1986 -- Get the newly bound things, and bind them.
1987 -- Don't need to delete any shadowed bindings;
1988 -- the new ones override the old ones.
1989 extendLinkEnv (zip names hvals)
1991 writeIORef ref new_hsc_env
1992 return (RunOk names)
1994 -- When running a computation, we redirect ^C exceptions to the running
1995 -- thread. ToDo: we might want a way to continue even if the target
1996 -- thread doesn't die when it receives the exception... "this thread
1997 -- is not responding".
1998 sandboxIO :: IO a -> IO (Either Exception a)
1999 sandboxIO thing = do
2001 ts <- takeMVar interruptTargetThread
2002 child <- forkIO (do res <- Exception.try thing; putMVar m res)
2003 putMVar interruptTargetThread (child:ts)
2004 takeMVar m `finally` modifyMVar_ interruptTargetThread (return.tail)
2007 -- This version of sandboxIO runs the expression in a completely new
2008 -- RTS main thread. It is disabled for now because ^C exceptions
2009 -- won't be delivered to the new thread, instead they'll be delivered
2010 -- to the (blocked) GHCi main thread.
2012 -- SLPJ: when re-enabling this, reflect a wrong-stat error as an exception
2014 sandboxIO :: IO a -> IO (Either Int (Either Exception a))
2015 sandboxIO thing = do
2016 st_thing <- newStablePtr (Exception.try thing)
2017 alloca $ \ p_st_result -> do
2018 stat <- rts_evalStableIO st_thing p_st_result
2019 freeStablePtr st_thing
2021 then do st_result <- peek p_st_result
2022 result <- deRefStablePtr st_result
2023 freeStablePtr st_result
2024 return (Right result)
2026 return (Left (fromIntegral stat))
2028 foreign import "rts_evalStableIO" {- safe -}
2029 rts_evalStableIO :: StablePtr (IO a) -> Ptr (StablePtr a) -> IO CInt
2030 -- more informative than the C type!
2033 -----------------------------------------------------------------------------
2034 -- show a module and it's source/object filenames
2036 showModule :: Session -> ModSummary -> IO String
2037 showModule s mod_summary = withSession s $ \hsc_env -> do
2038 case lookupModuleEnv (hsc_HPT hsc_env) (ms_mod mod_summary) of
2039 Nothing -> panic "missing linkable"
2040 Just mod_info -> return (showModMsg obj_linkable mod_summary)
2042 obj_linkable = isObjectLinkable (fromJust (hm_linkable mod_info))