1 -- -----------------------------------------------------------------------------
3 -- (c) The University of Glasgow, 2005
7 -- -----------------------------------------------------------------------------
13 defaultCleanupHandler,
17 -- * Flags and settings
18 DynFlags(..), DynFlag(..), GhcMode(..), HscTarget(..), dopt,
26 Target(..), TargetId(..), Phase,
33 -- * Loading\/compiling the program
35 load, LoadHowMuch(..), SuccessFlag(..), -- also does depanal
37 workingDirectoryChanged,
38 checkModule, CheckedModule(..),
39 TypecheckedSource, ParsedSource, RenamedSource,
41 -- * Inspecting the module structure of the program
42 ModuleGraph, ModSummary(..),
47 -- * Inspecting modules
52 modInfoPrintUnqualified,
55 modInfoIsExportedName,
60 PrintUnqualified, alwaysQualify,
62 -- * Interactive evaluation
63 getBindings, getPrintUnqual,
65 setContext, getContext,
79 -- * Abstract syntax elements
82 Module, mkModule, pprModule,
86 nameModule, nameParent_maybe, pprParenSymName, nameSrcLoc,
91 isImplicitId, isDeadBinder,
92 isSpecPragmaId, isExportedId, isLocalId, isGlobalId,
94 isPrimOpId, isFCallId, isClassOpId_maybe,
95 isDataConWorkId, idDataCon,
96 isBottomingId, isDictonaryId,
97 recordSelectorFieldLabel,
99 -- ** Type constructors
101 tyConTyVars, tyConDataCons,
102 isClassTyCon, isSynTyCon, isNewTyCon,
105 -- ** Data constructors
107 dataConSig, dataConType, dataConTyCon, dataConFieldLabels,
108 dataConIsInfix, isVanillaDataCon,
110 StrictnessMark(..), isMarkedStrict,
114 classMethods, classSCTheta, classTvsFds,
119 instanceDFunId, pprInstance,
121 -- ** Types and Kinds
122 Type, dropForAlls, splitForAllTys, funResultTy, pprParendType,
125 ThetaType, pprThetaArrow,
131 module HsSyn, -- ToDo: remove extraneous bits
135 defaultFixity, maxPrecedence,
139 -- ** Source locations
143 GhcException(..), showGhcException,
153 * inline bits of HscMain here to simplify layering: hscTcExpr, hscStmt.
154 * we need to expose DynFlags, so should parseDynamicFlags really be
155 part of this interface?
156 * what StaticFlags should we expose, if any?
159 #include "HsVersions.h"
162 import qualified Linker
163 import Linker ( HValue, extendLinkEnv )
164 import TcRnDriver ( tcRnLookupRdrName, tcRnGetInfo,
165 tcRnLookupName, getModuleExports )
166 import RdrName ( plusGlobalRdrEnv, Provenance(..),
167 ImportSpec(..), ImpDeclSpec(..), ImpItemSpec(..),
168 emptyGlobalRdrEnv, mkGlobalRdrEnv )
169 import HscMain ( hscParseIdentifier, hscStmt, hscTcExpr, hscKcType )
170 import Type ( tidyType )
171 import VarEnv ( emptyTidyEnv )
172 import GHC.Exts ( unsafeCoerce# )
175 import Packages ( initPackages, isHomeModule )
176 import NameSet ( NameSet, nameSetToList, elemNameSet )
177 import RdrName ( GlobalRdrEnv, GlobalRdrElt(..), RdrName,
180 import Type ( Kind, Type, dropForAlls, PredType, ThetaType,
181 pprThetaArrow, pprParendType, splitForAllTys,
183 import Id ( Id, idType, isImplicitId, isDeadBinder,
184 isSpecPragmaId, isExportedId, isLocalId, isGlobalId,
185 isRecordSelector, recordSelectorFieldLabel,
186 isPrimOpId, isFCallId, isClassOpId_maybe,
187 isDataConWorkId, idDataCon,
189 import TyCon ( TyCon, isClassTyCon, isSynTyCon, isNewTyCon,
190 tyConTyVars, tyConDataCons, getSynTyConDefn )
191 import Class ( Class, classSCTheta, classTvsFds, classMethods )
192 import FunDeps ( pprFundeps )
193 import DataCon ( DataCon, dataConWrapId, dataConSig, dataConTyCon,
194 dataConFieldLabels, dataConStrictMarks,
195 dataConIsInfix, isVanillaDataCon )
196 import Name ( Name, nameModule, NamedThing(..), nameParent_maybe,
198 import OccName ( parenSymOcc )
199 import NameEnv ( nameEnvElts )
200 import InstEnv ( Instance, instanceDFunId, pprInstance )
202 import DriverPipeline
203 import DriverPhases ( Phase(..), isHaskellSrcFilename, startPhase )
204 import GetImports ( getImports )
205 import Packages ( isHomePackage )
207 import HscMain ( newHscEnv, hscFileCheck, HscResult(..) )
211 import SysTools ( initSysTools, cleanTempFiles )
216 import Bag ( unitBag, emptyBag )
217 import ErrUtils ( showPass, Messages, putMsg, debugTraceMsg,
218 mkPlainErrMsg, pprBagOfErrors )
219 import qualified ErrUtils
221 import StringBuffer ( StringBuffer, hGetStringBuffer )
223 import SysTools ( cleanTempFilesExcept )
225 import TcType ( tcSplitSigmaTy, isDictTy )
226 import FastString ( mkFastString )
228 import Directory ( getModificationTime, doesFileExist )
229 import Maybe ( isJust, isNothing, fromJust )
230 import Maybes ( orElse, expectJust, mapCatMaybes )
231 import List ( partition, nub )
232 import qualified List
233 import Monad ( unless, when )
234 import System ( exitWith, ExitCode(..) )
235 import Time ( ClockTime )
236 import EXCEPTION as Exception hiding (handle)
239 import Prelude hiding (init)
241 -- -----------------------------------------------------------------------------
242 -- Exception handlers
244 -- | Install some default exception handlers and run the inner computation.
245 -- Unless you want to handle exceptions yourself, you should wrap this around
246 -- the top level of your program. The default handlers output the error
247 -- message(s) to stderr and exit cleanly.
248 defaultErrorHandler :: IO a -> IO a
249 defaultErrorHandler inner =
250 -- top-level exception handler: any unrecognised exception is a compiler bug.
251 handle (\exception -> do
254 -- an IO exception probably isn't our fault, so don't panic
255 IOException _ -> putMsg (show exception)
256 AsyncException StackOverflow ->
257 putMsg "stack overflow: use +RTS -K<size> to increase it"
258 _other -> putMsg (show (Panic (show exception)))
259 exitWith (ExitFailure 1)
262 -- program errors: messages with locations attached. Sometimes it is
263 -- convenient to just throw these as exceptions.
264 handleDyn (\dyn -> do printErrs (pprBagOfErrors (unitBag dyn))
265 exitWith (ExitFailure 1)) $
267 -- error messages propagated as exceptions
268 handleDyn (\dyn -> do
271 PhaseFailed _ code -> exitWith code
272 Interrupted -> exitWith (ExitFailure 1)
273 _ -> do putMsg (show (dyn :: GhcException))
274 exitWith (ExitFailure 1)
278 -- | Install a default cleanup handler to remove temporary files
279 -- deposited by a GHC run. This is seperate from
280 -- 'defaultErrorHandler', because you might want to override the error
281 -- handling, but still get the ordinary cleanup behaviour.
282 defaultCleanupHandler :: DynFlags -> IO a -> IO a
283 defaultCleanupHandler dflags inner =
284 -- make sure we clean up after ourselves
285 later (unless (dopt Opt_KeepTmpFiles dflags) $
286 cleanTempFiles dflags)
287 -- exceptions will be blocked while we clean the temporary files,
288 -- so there shouldn't be any difficulty if we receive further
293 -- | Initialises GHC. This must be done /once/ only. Takes the
294 -- command-line arguments. All command-line arguments which aren't
295 -- understood by GHC will be returned.
297 init :: [String] -> IO [String]
300 installSignalHandlers
302 -- Grab the -B option if there is one
303 let (minusB_args, argv1) = partition (prefixMatch "-B") args
304 dflags0 <- initSysTools minusB_args defaultDynFlags
305 writeIORef v_initDynFlags dflags0
307 -- Parse the static flags
308 argv2 <- parseStaticFlags argv1
311 GLOBAL_VAR(v_initDynFlags, error "initDynFlags", DynFlags)
312 -- stores the DynFlags between the call to init and subsequent
313 -- calls to newSession.
315 -- | Starts a new session. A session consists of a set of loaded
316 -- modules, a set of options (DynFlags), and an interactive context.
317 -- ToDo: GhcMode should say "keep typechecked code" and\/or "keep renamed
319 newSession :: GhcMode -> IO Session
321 dflags0 <- readIORef v_initDynFlags
322 dflags <- initDynFlags dflags0
323 env <- newHscEnv dflags{ ghcMode=mode }
327 -- tmp: this breaks the abstraction, but required because DriverMkDepend
328 -- needs to call the Finder. ToDo: untangle this.
329 sessionHscEnv :: Session -> IO HscEnv
330 sessionHscEnv (Session ref) = readIORef ref
332 withSession :: Session -> (HscEnv -> IO a) -> IO a
333 withSession (Session ref) f = do h <- readIORef ref; f h
335 modifySession :: Session -> (HscEnv -> HscEnv) -> IO ()
336 modifySession (Session ref) f = do h <- readIORef ref; writeIORef ref $! f h
338 -- -----------------------------------------------------------------------------
341 -- | Grabs the DynFlags from the Session
342 getSessionDynFlags :: Session -> IO DynFlags
343 getSessionDynFlags s = withSession s (return . hsc_dflags)
345 -- | Updates the DynFlags in a Session
346 setSessionDynFlags :: Session -> DynFlags -> IO ()
347 setSessionDynFlags s dflags = modifySession s (\h -> h{ hsc_dflags = dflags })
349 -- | Messages during compilation (eg. warnings and progress messages)
350 -- are reported using this callback. By default, these messages are
351 -- printed to stderr.
352 setMsgHandler :: (String -> IO ()) -> IO ()
353 setMsgHandler = ErrUtils.setMsgHandler
355 -- -----------------------------------------------------------------------------
358 -- ToDo: think about relative vs. absolute file paths. And what
359 -- happens when the current directory changes.
361 -- | Sets the targets for this session. Each target may be a module name
362 -- or a filename. The targets correspond to the set of root modules for
363 -- the program\/library. Unloading the current program is achieved by
364 -- setting the current set of targets to be empty, followed by load.
365 setTargets :: Session -> [Target] -> IO ()
366 setTargets s targets = modifySession s (\h -> h{ hsc_targets = targets })
368 -- | returns the current set of targets
369 getTargets :: Session -> IO [Target]
370 getTargets s = withSession s (return . hsc_targets)
372 -- | Add another target
373 addTarget :: Session -> Target -> IO ()
375 = modifySession s (\h -> h{ hsc_targets = target : hsc_targets h })
378 removeTarget :: Session -> TargetId -> IO ()
379 removeTarget s target_id
380 = modifySession s (\h -> h{ hsc_targets = filter (hsc_targets h) })
382 filter targets = [ t | t@(Target id _) <- targets, id /= target_id ]
384 -- Attempts to guess what Target a string refers to. This function implements
385 -- the --make/GHCi command-line syntax for filenames:
387 -- - if the string looks like a Haskell source filename, then interpret
389 -- - if adding a .hs or .lhs suffix yields the name of an existing file,
391 -- - otherwise interpret the string as a module name
393 guessTarget :: String -> Maybe Phase -> IO Target
394 guessTarget file (Just phase)
395 = return (Target (TargetFile file (Just phase)) Nothing)
396 guessTarget file Nothing
397 | isHaskellSrcFilename file
398 = return (Target (TargetFile file Nothing) Nothing)
400 = do exists <- doesFileExist hs_file
402 then return (Target (TargetFile hs_file Nothing) Nothing)
404 exists <- doesFileExist lhs_file
406 then return (Target (TargetFile lhs_file Nothing) Nothing)
408 return (Target (TargetModule (mkModule file)) Nothing)
410 hs_file = file `joinFileExt` "hs"
411 lhs_file = file `joinFileExt` "lhs"
413 -- -----------------------------------------------------------------------------
414 -- Loading the program
416 -- Perform a dependency analysis starting from the current targets
417 -- and update the session with the new module graph.
418 depanal :: Session -> [Module] -> IO (Either Messages ModuleGraph)
419 depanal (Session ref) excluded_mods = do
420 hsc_env <- readIORef ref
422 dflags = hsc_dflags hsc_env
423 gmode = ghcMode (hsc_dflags hsc_env)
424 targets = hsc_targets hsc_env
425 old_graph = hsc_mod_graph hsc_env
427 showPass dflags "Chasing dependencies"
428 when (gmode == BatchCompile) $
429 debugTraceMsg dflags 1 (showSDoc (hcat [
430 text "Chasing modules from: ",
431 hcat (punctuate comma (map pprTarget targets))]))
433 r <- downsweep hsc_env old_graph excluded_mods
435 Right mod_graph -> writeIORef ref hsc_env{ hsc_mod_graph = mod_graph }
440 -- | The result of load.
442 = LoadOk Errors -- ^ all specified targets were loaded successfully.
443 | LoadFailed Errors -- ^ not all modules were loaded.
445 type Errors = [String]
447 data ErrMsg = ErrMsg {
448 errMsgSeverity :: Severity, -- warning, error, etc.
449 errMsgSpans :: [SrcSpan],
450 errMsgShortDoc :: Doc,
451 errMsgExtraInfo :: Doc
458 | LoadDependenciesOf Module
460 -- | Try to load the program. If a Module is supplied, then just
461 -- attempt to load up to this target. If no Module is supplied,
462 -- then try to load all targets.
463 load :: Session -> LoadHowMuch -> IO SuccessFlag
464 load session how_much =
465 loadMsgs session how_much ErrUtils.printErrorsAndWarnings
467 -- | Version of 'load' that takes a callback function to be invoked
468 -- on compiler errors and warnings as they occur during compilation.
469 loadMsgs :: Session -> LoadHowMuch -> (Messages-> IO ()) -> IO SuccessFlag
470 loadMsgs s@(Session ref) how_much msg_act
472 -- Dependency analysis first. Note that this fixes the module graph:
473 -- even if we don't get a fully successful upsweep, the full module
474 -- graph is still retained in the Session. We can tell which modules
475 -- were successfully loaded by inspecting the Session's HPT.
476 mb_graph <- depanal s []
478 Left msgs -> do msg_act msgs; return Failed
479 Right mod_graph -> loadMsgs2 s how_much msg_act mod_graph
481 loadMsgs2 s@(Session ref) how_much msg_act mod_graph = do
482 hsc_env <- readIORef ref
484 let hpt1 = hsc_HPT hsc_env
485 let dflags = hsc_dflags hsc_env
486 let ghci_mode = ghcMode dflags -- this never changes
488 -- The "bad" boot modules are the ones for which we have
489 -- B.hs-boot in the module graph, but no B.hs
490 -- The downsweep should have ensured this does not happen
492 let all_home_mods = [ms_mod s | s <- mod_graph, not (isBootSummary s)]
494 bad_boot_mods = [s | s <- mod_graph, isBootSummary s,
495 not (ms_mod s `elem` all_home_mods)]
497 ASSERT( null bad_boot_mods ) return ()
499 -- mg2_with_srcimps drops the hi-boot nodes, returning a
500 -- graph with cycles. Among other things, it is used for
501 -- backing out partially complete cycles following a failed
502 -- upsweep, and for removing from hpt all the modules
503 -- not in strict downwards closure, during calls to compile.
504 let mg2_with_srcimps :: [SCC ModSummary]
505 mg2_with_srcimps = topSortModuleGraph True mod_graph Nothing
507 -- check the stability property for each module.
508 stable_mods@(stable_obj,stable_bco)
509 | BatchCompile <- ghci_mode = ([],[])
510 | otherwise = checkStability hpt1 mg2_with_srcimps all_home_mods
512 -- prune bits of the HPT which are definitely redundant now,
514 pruned_hpt = pruneHomePackageTable hpt1
515 (flattenSCCs mg2_with_srcimps)
520 debugTraceMsg dflags 2 (showSDoc (text "Stable obj:" <+> ppr stable_obj $$
521 text "Stable BCO:" <+> ppr stable_bco))
523 -- Unload any modules which are going to be re-linked this time around.
524 let stable_linkables = [ linkable
525 | m <- stable_obj++stable_bco,
526 Just hmi <- [lookupModuleEnv pruned_hpt m],
527 Just linkable <- [hm_linkable hmi] ]
528 unload hsc_env stable_linkables
530 -- We could at this point detect cycles which aren't broken by
531 -- a source-import, and complain immediately, but it seems better
532 -- to let upsweep_mods do this, so at least some useful work gets
533 -- done before the upsweep is abandoned.
534 --hPutStrLn stderr "after tsort:\n"
535 --hPutStrLn stderr (showSDoc (vcat (map ppr mg2)))
537 -- Now do the upsweep, calling compile for each module in
538 -- turn. Final result is version 3 of everything.
540 -- Topologically sort the module graph, this time including hi-boot
541 -- nodes, and possibly just including the portion of the graph
542 -- reachable from the module specified in the 2nd argument to load.
543 -- This graph should be cycle-free.
544 -- If we're restricting the upsweep to a portion of the graph, we
545 -- also want to retain everything that is still stable.
546 let full_mg :: [SCC ModSummary]
547 full_mg = topSortModuleGraph False mod_graph Nothing
549 maybe_top_mod = case how_much of
551 LoadDependenciesOf m -> Just m
554 partial_mg0 :: [SCC ModSummary]
555 partial_mg0 = topSortModuleGraph False mod_graph maybe_top_mod
557 -- LoadDependenciesOf m: we want the upsweep to stop just
558 -- short of the specified module (unless the specified module
561 | LoadDependenciesOf mod <- how_much
562 = ASSERT( case last partial_mg0 of
563 AcyclicSCC ms -> ms_mod ms == mod; _ -> False )
564 List.init partial_mg0
570 | AcyclicSCC ms <- full_mg,
571 ms_mod ms `elem` stable_obj++stable_bco,
572 ms_mod ms `notElem` [ ms_mod ms' |
573 AcyclicSCC ms' <- partial_mg ] ]
575 mg = stable_mg ++ partial_mg
577 -- clean up between compilations
578 let cleanup = cleanTempFilesExcept dflags
579 (ppFilesFromSummaries (flattenSCCs mg2_with_srcimps))
581 (upsweep_ok, hsc_env1, modsUpswept)
582 <- upsweep (hsc_env { hsc_HPT = emptyHomePackageTable })
583 pruned_hpt stable_mods cleanup msg_act mg
585 -- Make modsDone be the summaries for each home module now
586 -- available; this should equal the domain of hpt3.
587 -- Get in in a roughly top .. bottom order (hence reverse).
589 let modsDone = reverse modsUpswept
591 -- Try and do linking in some form, depending on whether the
592 -- upsweep was completely or only partially successful.
594 if succeeded upsweep_ok
597 -- Easy; just relink it all.
598 do debugTraceMsg dflags 2 "Upsweep completely successful."
600 -- Clean up after ourselves
601 cleanTempFilesExcept dflags (ppFilesFromSummaries modsDone)
603 -- Issue a warning for the confusing case where the user
604 -- said '-o foo' but we're not going to do any linking.
605 -- We attempt linking if either (a) one of the modules is
606 -- called Main, or (b) the user said -no-hs-main, indicating
607 -- that main() is going to come from somewhere else.
609 let ofile = outputFile dflags
610 let no_hs_main = dopt Opt_NoHsMain dflags
611 let mb_main_mod = mainModIs dflags
613 main_mod = mb_main_mod `orElse` "Main"
615 = any ((==main_mod).moduleUserString.ms_mod)
617 do_linking = a_root_is_Main || no_hs_main
619 when (ghci_mode == BatchCompile && isJust ofile && not do_linking) $
620 debugTraceMsg dflags 1 ("Warning: output was redirected with -o, " ++
621 "but no output will be generated\n" ++
622 "because there is no " ++ main_mod ++ " module.")
624 -- link everything together
625 linkresult <- link ghci_mode dflags do_linking (hsc_HPT hsc_env1)
627 loadFinish Succeeded linkresult ref hsc_env1
630 -- Tricky. We need to back out the effects of compiling any
631 -- half-done cycles, both so as to clean up the top level envs
632 -- and to avoid telling the interactive linker to link them.
633 do debugTraceMsg dflags 2 "Upsweep partially successful."
636 = map ms_mod modsDone
637 let mods_to_zap_names
638 = findPartiallyCompletedCycles modsDone_names
641 = filter ((`notElem` mods_to_zap_names).ms_mod)
644 let hpt4 = retainInTopLevelEnvs (map ms_mod mods_to_keep)
647 -- Clean up after ourselves
648 cleanTempFilesExcept dflags (ppFilesFromSummaries mods_to_keep)
650 -- there should be no Nothings where linkables should be, now
651 ASSERT(all (isJust.hm_linkable)
652 (moduleEnvElts (hsc_HPT hsc_env))) do
654 -- Link everything together
655 linkresult <- link ghci_mode dflags False hpt4
657 let hsc_env4 = hsc_env1{ hsc_HPT = hpt4 }
658 loadFinish Failed linkresult ref hsc_env4
660 -- Finish up after a load.
662 -- If the link failed, unload everything and return.
663 loadFinish all_ok Failed ref hsc_env
664 = do unload hsc_env []
665 writeIORef ref $! discardProg hsc_env
668 -- Empty the interactive context and set the module context to the topmost
669 -- newly loaded module, or the Prelude if none were loaded.
670 loadFinish all_ok Succeeded ref hsc_env
671 = do writeIORef ref $! hsc_env{ hsc_IC = emptyInteractiveContext }
675 -- Forget the current program, but retain the persistent info in HscEnv
676 discardProg :: HscEnv -> HscEnv
678 = hsc_env { hsc_mod_graph = emptyMG,
679 hsc_IC = emptyInteractiveContext,
680 hsc_HPT = emptyHomePackageTable }
682 -- used to fish out the preprocess output files for the purposes of
683 -- cleaning up. The preprocessed file *might* be the same as the
684 -- source file, but that doesn't do any harm.
685 ppFilesFromSummaries summaries = [ fn | Just fn <- map ms_hspp_file summaries ]
687 -- -----------------------------------------------------------------------------
691 CheckedModule { parsedSource :: ParsedSource,
692 renamedSource :: Maybe RenamedSource,
693 typecheckedSource :: Maybe TypecheckedSource,
694 checkedModuleInfo :: Maybe ModuleInfo
696 -- ToDo: improvements that could be made here:
697 -- if the module succeeded renaming but not typechecking,
698 -- we can still get back the GlobalRdrEnv and exports, so
699 -- perhaps the ModuleInfo should be split up into separate
700 -- fields within CheckedModule.
702 type ParsedSource = Located (HsModule RdrName)
703 type RenamedSource = HsGroup Name
704 type TypecheckedSource = LHsBinds Id
706 -- | This is the way to get access to parsed and typechecked source code
707 -- for a module. 'checkModule' loads all the dependencies of the specified
708 -- module in the Session, and then attempts to typecheck the module. If
709 -- successful, it returns the abstract syntax for the module.
710 checkModule :: Session -> Module -> (Messages -> IO ())
711 -> IO (Maybe CheckedModule)
712 checkModule session@(Session ref) mod msg_act = do
713 -- load up the dependencies first
714 r <- loadMsgs session (LoadDependenciesOf mod) msg_act
715 if (failed r) then return Nothing else do
717 -- now parse & typecheck the module
718 hsc_env <- readIORef ref
719 let mg = hsc_mod_graph hsc_env
720 case [ ms | ms <- mg, ms_mod ms == mod ] of
723 -- Add in the OPTIONS from the source file This is nasty:
724 -- we've done this once already, in the compilation manager
725 -- It might be better to cache the flags in the
726 -- ml_hspp_file field, say
727 let dflags0 = hsc_dflags hsc_env
728 hspp_buf = expectJust "GHC.checkModule" (ms_hspp_buf ms)
729 opts = getOptionsFromStringBuffer hspp_buf
730 (dflags1,leftovers) <- parseDynamicFlags dflags0 (map snd opts)
731 if (not (null leftovers))
732 then do let filename = fromJust (ml_hs_file (ms_location ms))
733 msg_act (optionsErrorMsgs leftovers opts filename)
737 r <- hscFileCheck hsc_env{hsc_dflags=dflags1} msg_act ms
741 HscChecked parsed renamed Nothing ->
742 return (Just (CheckedModule {
743 parsedSource = parsed,
744 renamedSource = renamed,
745 typecheckedSource = Nothing,
746 checkedModuleInfo = Nothing }))
747 HscChecked parsed renamed
748 (Just (tc_binds, rdr_env, details)) -> do
749 let minf = ModuleInfo {
750 minf_type_env = md_types details,
751 minf_exports = md_exports details,
752 minf_rdr_env = Just rdr_env,
753 minf_instances = md_insts details
755 return (Just (CheckedModule {
756 parsedSource = parsed,
757 renamedSource = renamed,
758 typecheckedSource = Just tc_binds,
759 checkedModuleInfo = Just minf }))
763 -- ---------------------------------------------------------------------------
766 unload :: HscEnv -> [Linkable] -> IO ()
767 unload hsc_env stable_linkables -- Unload everthing *except* 'stable_linkables'
768 = case ghcMode (hsc_dflags hsc_env) of
769 BatchCompile -> return ()
770 JustTypecheck -> return ()
772 Interactive -> Linker.unload (hsc_dflags hsc_env) stable_linkables
774 Interactive -> panic "unload: no interpreter"
776 other -> panic "unload: strange mode"
778 -- -----------------------------------------------------------------------------
782 Stability tells us which modules definitely do not need to be recompiled.
783 There are two main reasons for having stability:
785 - avoid doing a complete upsweep of the module graph in GHCi when
786 modules near the bottom of the tree have not changed.
788 - to tell GHCi when it can load object code: we can only load object code
789 for a module when we also load object code fo all of the imports of the
790 module. So we need to know that we will definitely not be recompiling
791 any of these modules, and we can use the object code.
793 NB. stability is of no importance to BatchCompile at all, only Interactive.
794 (ToDo: what about JustTypecheck?)
796 The stability check is as follows. Both stableObject and
797 stableBCO are used during the upsweep phase later.
800 stable m = stableObject m || stableBCO m
803 all stableObject (imports m)
804 && old linkable does not exist, or is == on-disk .o
805 && date(on-disk .o) > date(.hs)
808 all stable (imports m)
809 && date(BCO) > date(.hs)
812 These properties embody the following ideas:
814 - if a module is stable:
815 - if it has been compiled in a previous pass (present in HPT)
816 then it does not need to be compiled or re-linked.
817 - if it has not been compiled in a previous pass,
818 then we only need to read its .hi file from disk and
819 link it to produce a ModDetails.
821 - if a modules is not stable, we will definitely be at least
822 re-linking, and possibly re-compiling it during the upsweep.
823 All non-stable modules can (and should) therefore be unlinked
826 - Note that objects are only considered stable if they only depend
827 on other objects. We can't link object code against byte code.
831 :: HomePackageTable -- HPT from last compilation
832 -> [SCC ModSummary] -- current module graph (cyclic)
833 -> [Module] -- all home modules
834 -> ([Module], -- stableObject
835 [Module]) -- stableBCO
837 checkStability hpt sccs all_home_mods = foldl checkSCC ([],[]) sccs
839 checkSCC (stable_obj, stable_bco) scc0
840 | stableObjects = (scc_mods ++ stable_obj, stable_bco)
841 | stableBCOs = (stable_obj, scc_mods ++ stable_bco)
842 | otherwise = (stable_obj, stable_bco)
844 scc = flattenSCC scc0
845 scc_mods = map ms_mod scc
846 home_module m = m `elem` all_home_mods && m `notElem` scc_mods
848 scc_allimps = nub (filter home_module (concatMap ms_allimps scc))
849 -- all imports outside the current SCC, but in the home pkg
851 stable_obj_imps = map (`elem` stable_obj) scc_allimps
852 stable_bco_imps = map (`elem` stable_bco) scc_allimps
859 and (zipWith (||) stable_obj_imps stable_bco_imps)
863 | Just t <- ms_obj_date ms = t >= ms_hs_date ms
867 same_as_prev t = case lookupModuleEnv hpt (ms_mod ms) of
868 Just hmi | Just l <- hm_linkable hmi
869 -> isObjectLinkable l && t == linkableTime l
871 -- why '>=' rather than '>' above? If the filesystem stores
872 -- times to the nearset second, we may occasionally find that
873 -- the object & source have the same modification time,
874 -- especially if the source was automatically generated
875 -- and compiled. Using >= is slightly unsafe, but it matches
879 = case lookupModuleEnv hpt (ms_mod ms) of
880 Just hmi | Just l <- hm_linkable hmi ->
881 not (isObjectLinkable l) &&
882 linkableTime l >= ms_hs_date ms
885 ms_allimps :: ModSummary -> [Module]
886 ms_allimps ms = map unLoc (ms_srcimps ms ++ ms_imps ms)
888 -- -----------------------------------------------------------------------------
889 -- Prune the HomePackageTable
891 -- Before doing an upsweep, we can throw away:
893 -- - For non-stable modules:
894 -- - all ModDetails, all linked code
895 -- - all unlinked code that is out of date with respect to
898 -- This is VERY IMPORTANT otherwise we'll end up requiring 2x the
899 -- space at the end of the upsweep, because the topmost ModDetails of the
900 -- old HPT holds on to the entire type environment from the previous
903 pruneHomePackageTable
906 -> ([Module],[Module])
909 pruneHomePackageTable hpt summ (stable_obj, stable_bco)
910 = mapModuleEnv prune hpt
912 | is_stable modl = hmi'
913 | otherwise = hmi'{ hm_details = emptyModDetails }
915 modl = mi_module (hm_iface hmi)
916 hmi' | Just l <- hm_linkable hmi, linkableTime l < ms_hs_date ms
917 = hmi{ hm_linkable = Nothing }
920 where ms = expectJust "prune" (lookupModuleEnv ms_map modl)
922 ms_map = mkModuleEnv [(ms_mod ms, ms) | ms <- summ]
924 is_stable m = m `elem` stable_obj || m `elem` stable_bco
926 -- -----------------------------------------------------------------------------
928 -- Return (names of) all those in modsDone who are part of a cycle
929 -- as defined by theGraph.
930 findPartiallyCompletedCycles :: [Module] -> [SCC ModSummary] -> [Module]
931 findPartiallyCompletedCycles modsDone theGraph
935 chew ((AcyclicSCC v):rest) = chew rest -- acyclic? not interesting.
936 chew ((CyclicSCC vs):rest)
937 = let names_in_this_cycle = nub (map ms_mod vs)
939 = nub ([done | done <- modsDone,
940 done `elem` names_in_this_cycle])
941 chewed_rest = chew rest
943 if notNull mods_in_this_cycle
944 && length mods_in_this_cycle < length names_in_this_cycle
945 then mods_in_this_cycle ++ chewed_rest
948 -- -----------------------------------------------------------------------------
951 -- This is where we compile each module in the module graph, in a pass
952 -- from the bottom to the top of the graph.
954 -- There better had not be any cyclic groups here -- we check for them.
957 :: HscEnv -- Includes initially-empty HPT
958 -> HomePackageTable -- HPT from last time round (pruned)
959 -> ([Module],[Module]) -- stable modules (see checkStability)
960 -> IO () -- How to clean up unwanted tmp files
961 -> (Messages -> IO ()) -- Compiler error message callback
962 -> [SCC ModSummary] -- Mods to do (the worklist)
964 HscEnv, -- With an updated HPT
965 [ModSummary]) -- Mods which succeeded
967 upsweep hsc_env old_hpt stable_mods cleanup msg_act mods
968 = upsweep' hsc_env old_hpt stable_mods cleanup msg_act mods 1 (length mods)
970 upsweep' hsc_env old_hpt stable_mods cleanup msg_act
972 = return (Succeeded, hsc_env, [])
974 upsweep' hsc_env old_hpt stable_mods cleanup msg_act
976 = do putMsg (showSDoc (cyclicModuleErr ms))
977 return (Failed, hsc_env, [])
979 upsweep' hsc_env old_hpt stable_mods cleanup msg_act
980 (AcyclicSCC mod:mods) mod_index nmods
981 = do -- putStrLn ("UPSWEEP_MOD: hpt = " ++
982 -- show (map (moduleUserString.moduleName.mi_module.hm_iface)
983 -- (moduleEnvElts (hsc_HPT hsc_env)))
985 mb_mod_info <- upsweep_mod hsc_env old_hpt stable_mods msg_act mod
988 cleanup -- Remove unwanted tmp files between compilations
991 Nothing -> return (Failed, hsc_env, [])
993 { let this_mod = ms_mod mod
995 -- Add new info to hsc_env
996 hpt1 = extendModuleEnv (hsc_HPT hsc_env)
998 hsc_env1 = hsc_env { hsc_HPT = hpt1 }
1000 -- Space-saving: delete the old HPT entry
1001 -- for mod BUT if mod is a hs-boot
1002 -- node, don't delete it. For the
1003 -- interface, the HPT entry is probaby for the
1004 -- main Haskell source file. Deleting it
1005 -- would force .. (what?? --SDM)
1006 old_hpt1 | isBootSummary mod = old_hpt
1007 | otherwise = delModuleEnv old_hpt this_mod
1009 ; (restOK, hsc_env2, modOKs)
1010 <- upsweep' hsc_env1 old_hpt1 stable_mods cleanup
1011 msg_act mods (mod_index+1) nmods
1012 ; return (restOK, hsc_env2, mod:modOKs)
1016 -- Compile a single module. Always produce a Linkable for it if
1017 -- successful. If no compilation happened, return the old Linkable.
1018 upsweep_mod :: HscEnv
1020 -> ([Module],[Module])
1021 -> (Messages -> IO ())
1023 -> Int -- index of module
1024 -> Int -- total number of modules
1025 -> IO (Maybe HomeModInfo) -- Nothing => Failed
1027 upsweep_mod hsc_env old_hpt (stable_obj, stable_bco) msg_act summary mod_index nmods
1030 this_mod = ms_mod summary
1031 mb_obj_date = ms_obj_date summary
1032 obj_fn = ml_obj_file (ms_location summary)
1033 hs_date = ms_hs_date summary
1035 compile_it :: Maybe Linkable -> IO (Maybe HomeModInfo)
1036 compile_it = upsweep_compile hsc_env old_hpt this_mod
1037 msg_act summary mod_index nmods
1039 case ghcMode (hsc_dflags hsc_env) of
1042 -- Batch-compilating is easy: just check whether we have
1043 -- an up-to-date object file. If we do, then the compiler
1044 -- needs to do a recompilation check.
1045 _ | Just obj_date <- mb_obj_date, obj_date >= hs_date -> do
1047 findObjectLinkable this_mod obj_fn obj_date
1048 compile_it (Just linkable)
1055 _ | is_stable_obj, isJust old_hmi ->
1057 -- object is stable, and we have an entry in the
1058 -- old HPT: nothing to do
1060 | is_stable_obj, isNothing old_hmi -> do
1062 findObjectLinkable this_mod obj_fn
1063 (expectJust "upseep1" mb_obj_date)
1064 compile_it (Just linkable)
1065 -- object is stable, but we need to load the interface
1066 -- off disk to make a HMI.
1069 ASSERT(isJust old_hmi) -- must be in the old_hpt
1071 -- BCO is stable: nothing to do
1073 | Just hmi <- old_hmi,
1074 Just l <- hm_linkable hmi, not (isObjectLinkable l),
1075 linkableTime l >= ms_hs_date summary ->
1077 -- we have an old BCO that is up to date with respect
1078 -- to the source: do a recompilation check as normal.
1082 -- no existing code at all: we must recompile.
1084 is_stable_obj = this_mod `elem` stable_obj
1085 is_stable_bco = this_mod `elem` stable_bco
1087 old_hmi = lookupModuleEnv old_hpt this_mod
1089 -- Run hsc to compile a module
1090 upsweep_compile hsc_env old_hpt this_mod msg_act summary
1092 mb_old_linkable = do
1094 -- The old interface is ok if it's in the old HPT
1095 -- a) we're compiling a source file, and the old HPT
1096 -- entry is for a source file
1097 -- b) we're compiling a hs-boot file
1098 -- Case (b) allows an hs-boot file to get the interface of its
1099 -- real source file on the second iteration of the compilation
1100 -- manager, but that does no harm. Otherwise the hs-boot file
1101 -- will always be recompiled
1104 = case lookupModuleEnv old_hpt this_mod of
1106 Just hm_info | isBootSummary summary -> Just iface
1107 | not (mi_boot iface) -> Just iface
1108 | otherwise -> Nothing
1110 iface = hm_iface hm_info
1112 compresult <- compile hsc_env msg_act summary mb_old_linkable mb_old_iface
1116 -- Compilation failed. Compile may still have updated the PCS, tho.
1117 CompErrs -> return Nothing
1119 -- Compilation "succeeded", and may or may not have returned a new
1120 -- linkable (depending on whether compilation was actually performed
1122 CompOK new_details new_iface new_linkable
1123 -> do let new_info = HomeModInfo { hm_iface = new_iface,
1124 hm_details = new_details,
1125 hm_linkable = new_linkable }
1126 return (Just new_info)
1129 -- Filter modules in the HPT
1130 retainInTopLevelEnvs :: [Module] -> HomePackageTable -> HomePackageTable
1131 retainInTopLevelEnvs keep_these hpt
1132 = mkModuleEnv [ (mod, expectJust "retain" mb_mod_info)
1134 , let mb_mod_info = lookupModuleEnv hpt mod
1135 , isJust mb_mod_info ]
1137 -- ---------------------------------------------------------------------------
1138 -- Topological sort of the module graph
1141 :: Bool -- Drop hi-boot nodes? (see below)
1145 -- Calculate SCCs of the module graph, possibly dropping the hi-boot nodes
1146 -- The resulting list of strongly-connected-components is in topologically
1147 -- sorted order, starting with the module(s) at the bottom of the
1148 -- dependency graph (ie compile them first) and ending with the ones at
1151 -- Drop hi-boot nodes (first boolean arg)?
1153 -- False: treat the hi-boot summaries as nodes of the graph,
1154 -- so the graph must be acyclic
1156 -- True: eliminate the hi-boot nodes, and instead pretend
1157 -- the a source-import of Foo is an import of Foo
1158 -- The resulting graph has no hi-boot nodes, but can by cyclic
1160 topSortModuleGraph drop_hs_boot_nodes summaries Nothing
1161 = stronglyConnComp (fst (moduleGraphNodes drop_hs_boot_nodes summaries))
1162 topSortModuleGraph drop_hs_boot_nodes summaries (Just mod)
1163 = stronglyConnComp (map vertex_fn (reachable graph root))
1165 -- restrict the graph to just those modules reachable from
1166 -- the specified module. We do this by building a graph with
1167 -- the full set of nodes, and determining the reachable set from
1168 -- the specified node.
1169 (nodes, lookup_key) = moduleGraphNodes drop_hs_boot_nodes summaries
1170 (graph, vertex_fn, key_fn) = graphFromEdges' nodes
1172 | Just key <- lookup_key HsSrcFile mod, Just v <- key_fn key = v
1173 | otherwise = throwDyn (ProgramError "module does not exist")
1175 moduleGraphNodes :: Bool -> [ModSummary]
1176 -> ([(ModSummary, Int, [Int])], HscSource -> Module -> Maybe Int)
1177 moduleGraphNodes drop_hs_boot_nodes summaries = (nodes, lookup_key)
1179 -- Drop hs-boot nodes by using HsSrcFile as the key
1180 hs_boot_key | drop_hs_boot_nodes = HsSrcFile
1181 | otherwise = HsBootFile
1183 -- We use integers as the keys for the SCC algorithm
1184 nodes :: [(ModSummary, Int, [Int])]
1185 nodes = [(s, expectJust "topSort" (lookup_key (ms_hsc_src s) (ms_mod s)),
1186 out_edge_keys hs_boot_key (map unLoc (ms_srcimps s)) ++
1187 out_edge_keys HsSrcFile (map unLoc (ms_imps s)) )
1189 , not (isBootSummary s && drop_hs_boot_nodes) ]
1190 -- Drop the hi-boot ones if told to do so
1192 key_map :: NodeMap Int
1193 key_map = listToFM ([(ms_mod s, ms_hsc_src s) | s <- summaries]
1196 lookup_key :: HscSource -> Module -> Maybe Int
1197 lookup_key hs_src mod = lookupFM key_map (mod, hs_src)
1199 out_edge_keys :: HscSource -> [Module] -> [Int]
1200 out_edge_keys hi_boot ms = mapCatMaybes (lookup_key hi_boot) ms
1201 -- If we want keep_hi_boot_nodes, then we do lookup_key with
1202 -- the IsBootInterface parameter True; else False
1205 type NodeKey = (Module, HscSource) -- The nodes of the graph are
1206 type NodeMap a = FiniteMap NodeKey a -- keyed by (mod, src_file_type) pairs
1208 msKey :: ModSummary -> NodeKey
1209 msKey (ModSummary { ms_mod = mod, ms_hsc_src = boot }) = (mod,boot)
1211 mkNodeMap :: [ModSummary] -> NodeMap ModSummary
1212 mkNodeMap summaries = listToFM [ (msKey s, s) | s <- summaries]
1214 nodeMapElts :: NodeMap a -> [a]
1215 nodeMapElts = eltsFM
1217 -----------------------------------------------------------------------------
1218 -- Downsweep (dependency analysis)
1220 -- Chase downwards from the specified root set, returning summaries
1221 -- for all home modules encountered. Only follow source-import
1224 -- We pass in the previous collection of summaries, which is used as a
1225 -- cache to avoid recalculating a module summary if the source is
1228 -- The returned list of [ModSummary] nodes has one node for each home-package
1229 -- module, plus one for any hs-boot files. The imports of these nodes
1230 -- are all there, including the imports of non-home-package modules.
1233 -> [ModSummary] -- Old summaries
1234 -> [Module] -- Ignore dependencies on these; treat them as
1235 -- if they were package modules
1236 -> IO (Either Messages [ModSummary])
1237 downsweep hsc_env old_summaries excl_mods
1238 = -- catch error messages and return them
1239 handleDyn (\err_msg -> return (Left (emptyBag, unitBag err_msg))) $ do
1240 rootSummaries <- mapM getRootSummary roots
1241 checkDuplicates rootSummaries
1242 summs <- loop (concatMap msDeps rootSummaries) (mkNodeMap rootSummaries)
1243 return (Right summs)
1245 roots = hsc_targets hsc_env
1247 old_summary_map :: NodeMap ModSummary
1248 old_summary_map = mkNodeMap old_summaries
1250 getRootSummary :: Target -> IO ModSummary
1251 getRootSummary (Target (TargetFile file mb_phase) maybe_buf)
1252 = do exists <- doesFileExist file
1254 then summariseFile hsc_env old_summaries file mb_phase maybe_buf
1255 else throwDyn $ mkPlainErrMsg noSrcSpan $
1256 text "can't find file:" <+> text file
1257 getRootSummary (Target (TargetModule modl) maybe_buf)
1258 = do maybe_summary <- summariseModule hsc_env old_summary_map False
1259 (L rootLoc modl) maybe_buf excl_mods
1260 case maybe_summary of
1261 Nothing -> packageModErr modl
1264 rootLoc = mkGeneralSrcSpan FSLIT("<command line>")
1266 -- In a root module, the filename is allowed to diverge from the module
1267 -- name, so we have to check that there aren't multiple root files
1268 -- defining the same module (otherwise the duplicates will be silently
1269 -- ignored, leading to confusing behaviour).
1270 checkDuplicates :: [ModSummary] -> IO ()
1271 checkDuplicates summaries = mapM_ check summaries
1276 many -> multiRootsErr modl many
1277 where modl = ms_mod summ
1279 [ expectJust "checkDup" (ml_hs_file (ms_location summ'))
1280 | summ' <- summaries, ms_mod summ' == modl ]
1282 loop :: [(Located Module,IsBootInterface)]
1283 -- Work list: process these modules
1284 -> NodeMap ModSummary
1287 -- The result includes the worklist, except
1288 -- for those mentioned in the visited set
1289 loop [] done = return (nodeMapElts done)
1290 loop ((wanted_mod, is_boot) : ss) done
1291 | key `elemFM` done = loop ss done
1292 | otherwise = do { mb_s <- summariseModule hsc_env old_summary_map
1293 is_boot wanted_mod Nothing excl_mods
1295 Nothing -> loop ss done
1296 Just s -> loop (msDeps s ++ ss)
1297 (addToFM done key s) }
1299 key = (unLoc wanted_mod, if is_boot then HsBootFile else HsSrcFile)
1301 msDeps :: ModSummary -> [(Located Module, IsBootInterface)]
1302 -- (msDeps s) returns the dependencies of the ModSummary s.
1303 -- A wrinkle is that for a {-# SOURCE #-} import we return
1304 -- *both* the hs-boot file
1305 -- *and* the source file
1306 -- as "dependencies". That ensures that the list of all relevant
1307 -- modules always contains B.hs if it contains B.hs-boot.
1308 -- Remember, this pass isn't doing the topological sort. It's
1309 -- just gathering the list of all relevant ModSummaries
1311 concat [ [(m,True), (m,False)] | m <- ms_srcimps s ]
1312 ++ [ (m,False) | m <- ms_imps s ]
1314 -----------------------------------------------------------------------------
1315 -- Summarising modules
1317 -- We have two types of summarisation:
1319 -- * Summarise a file. This is used for the root module(s) passed to
1320 -- cmLoadModules. The file is read, and used to determine the root
1321 -- module name. The module name may differ from the filename.
1323 -- * Summarise a module. We are given a module name, and must provide
1324 -- a summary. The finder is used to locate the file in which the module
1329 -> [ModSummary] -- old summaries
1330 -> FilePath -- source file name
1331 -> Maybe Phase -- start phase
1332 -> Maybe (StringBuffer,ClockTime)
1335 summariseFile hsc_env old_summaries file mb_phase maybe_buf
1336 -- we can use a cached summary if one is available and the
1337 -- source file hasn't changed, But we have to look up the summary
1338 -- by source file, rather than module name as we do in summarise.
1339 | Just old_summary <- findSummaryBySourceFile old_summaries file
1341 let location = ms_location old_summary
1343 -- return the cached summary if the source didn't change
1344 src_timestamp <- case maybe_buf of
1345 Just (_,t) -> return t
1346 Nothing -> getModificationTime file
1348 if ms_hs_date old_summary == src_timestamp
1349 then do -- update the object-file timestamp
1350 obj_timestamp <- getObjTimestamp location False
1351 return old_summary{ ms_obj_date = obj_timestamp }
1359 let dflags = hsc_dflags hsc_env
1361 (dflags', hspp_fn, buf)
1362 <- preprocessFile dflags file mb_phase maybe_buf
1364 (srcimps,the_imps, L _ mod) <- getImports dflags' buf hspp_fn
1366 -- Make a ModLocation for this file
1367 location <- mkHomeModLocation dflags mod file
1369 -- Tell the Finder cache where it is, so that subsequent calls
1370 -- to findModule will find it, even if it's not on any search path
1371 addHomeModuleToFinder hsc_env mod location
1373 src_timestamp <- case maybe_buf of
1374 Just (_,t) -> return t
1375 Nothing -> getModificationTime file
1377 obj_timestamp <- modificationTimeIfExists (ml_obj_file location)
1379 return (ModSummary { ms_mod = mod, ms_hsc_src = HsSrcFile,
1380 ms_location = location,
1381 ms_hspp_file = Just hspp_fn,
1382 ms_hspp_buf = Just buf,
1383 ms_srcimps = srcimps, ms_imps = the_imps,
1384 ms_hs_date = src_timestamp,
1385 ms_obj_date = obj_timestamp })
1387 findSummaryBySourceFile :: [ModSummary] -> FilePath -> Maybe ModSummary
1388 findSummaryBySourceFile summaries file
1389 = case [ ms | ms <- summaries, HsSrcFile <- [ms_hsc_src ms],
1390 fromJust (ml_hs_file (ms_location ms)) == file ] of
1394 -- Summarise a module, and pick up source and timestamp.
1397 -> NodeMap ModSummary -- Map of old summaries
1398 -> IsBootInterface -- True <=> a {-# SOURCE #-} import
1399 -> Located Module -- Imported module to be summarised
1400 -> Maybe (StringBuffer, ClockTime)
1401 -> [Module] -- Modules to exclude
1402 -> IO (Maybe ModSummary) -- Its new summary
1404 summariseModule hsc_env old_summary_map is_boot (L loc wanted_mod) maybe_buf excl_mods
1405 | wanted_mod `elem` excl_mods
1408 | Just old_summary <- lookupFM old_summary_map (wanted_mod, hsc_src)
1409 = do -- Find its new timestamp; all the
1410 -- ModSummaries in the old map have valid ml_hs_files
1411 let location = ms_location old_summary
1412 src_fn = expectJust "summariseModule" (ml_hs_file location)
1414 -- return the cached summary if the source didn't change
1415 src_timestamp <- case maybe_buf of
1416 Just (_,t) -> return t
1417 Nothing -> getModificationTime src_fn
1419 if ms_hs_date old_summary == src_timestamp
1420 then do -- update the object-file timestamp
1421 obj_timestamp <- getObjTimestamp location is_boot
1422 return (Just old_summary{ ms_obj_date = obj_timestamp })
1424 -- source changed: re-summarise
1425 new_summary location src_fn maybe_buf src_timestamp
1428 = do found <- findModule hsc_env wanted_mod True {-explicit-}
1431 | not (isHomePackage pkg) -> return Nothing
1432 -- Drop external-pkg
1433 | isJust (ml_hs_file location) -> just_found location
1435 err -> noModError dflags loc wanted_mod err
1438 dflags = hsc_dflags hsc_env
1440 hsc_src = if is_boot then HsBootFile else HsSrcFile
1442 just_found location = do
1443 -- Adjust location to point to the hs-boot source file,
1444 -- hi file, object file, when is_boot says so
1445 let location' | is_boot = addBootSuffixLocn location
1446 | otherwise = location
1447 src_fn = expectJust "summarise2" (ml_hs_file location')
1449 -- Check that it exists
1450 -- It might have been deleted since the Finder last found it
1451 maybe_t <- modificationTimeIfExists src_fn
1453 Nothing -> noHsFileErr loc src_fn
1454 Just t -> new_summary location' src_fn Nothing t
1457 new_summary location src_fn maybe_bug src_timestamp
1459 -- Preprocess the source file and get its imports
1460 -- The dflags' contains the OPTIONS pragmas
1461 (dflags', hspp_fn, buf) <- preprocessFile dflags src_fn Nothing maybe_buf
1462 (srcimps, the_imps, L mod_loc mod_name) <- getImports dflags' buf hspp_fn
1464 when (mod_name /= wanted_mod) $
1465 throwDyn $ mkPlainErrMsg mod_loc $
1466 text "file name does not match module name"
1467 <+> quotes (ppr mod_name)
1469 -- Find the object timestamp, and return the summary
1470 obj_timestamp <- getObjTimestamp location is_boot
1472 return (Just ( ModSummary { ms_mod = wanted_mod,
1473 ms_hsc_src = hsc_src,
1474 ms_location = location,
1475 ms_hspp_file = Just hspp_fn,
1476 ms_hspp_buf = Just buf,
1477 ms_srcimps = srcimps,
1479 ms_hs_date = src_timestamp,
1480 ms_obj_date = obj_timestamp }))
1483 getObjTimestamp location is_boot
1484 = if is_boot then return Nothing
1485 else modificationTimeIfExists (ml_obj_file location)
1488 preprocessFile :: DynFlags -> FilePath -> Maybe Phase -> Maybe (StringBuffer,ClockTime)
1489 -> IO (DynFlags, FilePath, StringBuffer)
1490 preprocessFile dflags src_fn mb_phase Nothing
1492 (dflags', hspp_fn) <- preprocess dflags (src_fn, mb_phase)
1493 buf <- hGetStringBuffer hspp_fn
1494 return (dflags', hspp_fn, buf)
1496 preprocessFile dflags src_fn mb_phase (Just (buf, time))
1498 -- case we bypass the preprocessing stage?
1500 local_opts = getOptionsFromStringBuffer buf
1502 (dflags', errs) <- parseDynamicFlags dflags (map snd local_opts)
1506 | Just (Unlit _) <- mb_phase = True
1507 | Nothing <- mb_phase, Unlit _ <- startPhase src_fn = True
1508 -- note: local_opts is only required if there's no Unlit phase
1509 | dopt Opt_Cpp dflags' = True
1510 | dopt Opt_Pp dflags' = True
1513 when needs_preprocessing $
1514 ghcError (ProgramError "buffer needs preprocesing; interactive check disabled")
1516 return (dflags', src_fn, buf)
1519 -----------------------------------------------------------------------------
1521 -----------------------------------------------------------------------------
1523 noModError :: DynFlags -> SrcSpan -> Module -> FindResult -> IO ab
1524 -- ToDo: we don't have a proper line number for this error
1525 noModError dflags loc wanted_mod err
1526 = throwDyn $ mkPlainErrMsg loc $ cantFindError dflags wanted_mod err
1528 noHsFileErr loc path
1529 = throwDyn $ mkPlainErrMsg loc $ text "Can't find" <+> text path
1532 = throwDyn $ mkPlainErrMsg noSrcSpan $
1533 text "module" <+> quotes (ppr mod) <+> text "is a package module"
1535 multiRootsErr mod files
1536 = throwDyn $ mkPlainErrMsg noSrcSpan $
1537 text "module" <+> quotes (ppr mod) <+>
1538 text "is defined in multiple files:" <+>
1539 sep (map text files)
1541 cyclicModuleErr :: [ModSummary] -> SDoc
1543 = hang (ptext SLIT("Module imports form a cycle for modules:"))
1544 2 (vcat (map show_one ms))
1546 show_one ms = sep [ show_mod (ms_hsc_src ms) (ms_mod ms),
1547 nest 2 $ ptext SLIT("imports:") <+>
1548 (pp_imps HsBootFile (ms_srcimps ms)
1549 $$ pp_imps HsSrcFile (ms_imps ms))]
1550 show_mod hsc_src mod = ppr mod <> text (hscSourceString hsc_src)
1551 pp_imps src mods = fsep (map (show_mod src) mods)
1554 -- | Inform GHC that the working directory has changed. GHC will flush
1555 -- its cache of module locations, since it may no longer be valid.
1556 -- Note: if you change the working directory, you should also unload
1557 -- the current program (set targets to empty, followed by load).
1558 workingDirectoryChanged :: Session -> IO ()
1559 workingDirectoryChanged s = withSession s $ \hsc_env ->
1560 flushFinderCache (hsc_FC hsc_env)
1562 -- -----------------------------------------------------------------------------
1563 -- inspecting the session
1565 -- | Get the module dependency graph.
1566 getModuleGraph :: Session -> IO ModuleGraph -- ToDo: DiGraph ModSummary
1567 getModuleGraph s = withSession s (return . hsc_mod_graph)
1569 isLoaded :: Session -> Module -> IO Bool
1570 isLoaded s m = withSession s $ \hsc_env ->
1571 return $! isJust (lookupModuleEnv (hsc_HPT hsc_env) m)
1573 getBindings :: Session -> IO [TyThing]
1574 getBindings s = withSession s (return . nameEnvElts . ic_type_env . hsc_IC)
1576 getPrintUnqual :: Session -> IO PrintUnqualified
1577 getPrintUnqual s = withSession s (return . icPrintUnqual . hsc_IC)
1579 -- | Container for information about a 'Module'.
1580 data ModuleInfo = ModuleInfo {
1581 minf_type_env :: TypeEnv,
1582 minf_exports :: NameSet,
1583 minf_rdr_env :: Maybe GlobalRdrEnv, -- Nothing for a compiled/package mod
1584 minf_instances :: [Instance]
1585 -- ToDo: this should really contain the ModIface too
1587 -- We don't want HomeModInfo here, because a ModuleInfo applies
1588 -- to package modules too.
1590 -- | Request information about a loaded 'Module'
1591 getModuleInfo :: Session -> Module -> IO (Maybe ModuleInfo)
1592 getModuleInfo s mdl = withSession s $ \hsc_env -> do
1593 let mg = hsc_mod_graph hsc_env
1594 if mdl `elem` map ms_mod mg
1595 then getHomeModuleInfo hsc_env mdl
1597 if isHomeModule (hsc_dflags hsc_env) mdl
1599 else getPackageModuleInfo hsc_env mdl
1600 -- getPackageModuleInfo will attempt to find the interface, so
1601 -- we don't want to call it for a home module, just in case there
1602 -- was a problem loading the module and the interface doesn't
1603 -- exist... hence the isHomeModule test here.
1605 getPackageModuleInfo :: HscEnv -> Module -> IO (Maybe ModuleInfo)
1606 getPackageModuleInfo hsc_env mdl = do
1608 (_msgs, mb_names) <- getModuleExports hsc_env mdl
1610 Nothing -> return Nothing
1612 eps <- readIORef (hsc_EPS hsc_env)
1615 n_list = nameSetToList names
1616 tys = [ ty | name <- n_list,
1617 Just ty <- [lookupTypeEnv pte name] ]
1619 return (Just (ModuleInfo {
1620 minf_type_env = mkTypeEnv tys,
1621 minf_exports = names,
1622 minf_rdr_env = Just $! nameSetToGlobalRdrEnv names mdl,
1623 minf_instances = error "getModuleInfo: instances for package module unimplemented"
1626 -- bogusly different for non-GHCI (ToDo)
1630 getHomeModuleInfo hsc_env mdl =
1631 case lookupModuleEnv (hsc_HPT hsc_env) mdl of
1632 Nothing -> return Nothing
1634 let details = hm_details hmi
1635 return (Just (ModuleInfo {
1636 minf_type_env = md_types details,
1637 minf_exports = md_exports details,
1638 minf_rdr_env = mi_globals $! hm_iface hmi,
1639 minf_instances = md_insts details
1642 -- | The list of top-level entities defined in a module
1643 modInfoTyThings :: ModuleInfo -> [TyThing]
1644 modInfoTyThings minf = typeEnvElts (minf_type_env minf)
1646 modInfoTopLevelScope :: ModuleInfo -> Maybe [Name]
1647 modInfoTopLevelScope minf
1648 = fmap (map gre_name . globalRdrEnvElts) (minf_rdr_env minf)
1650 modInfoExports :: ModuleInfo -> [Name]
1651 modInfoExports minf = nameSetToList $! minf_exports minf
1653 -- | Returns the instances defined by the specified module.
1654 -- Warning: currently unimplemented for package modules.
1655 modInfoInstances :: ModuleInfo -> [Instance]
1656 modInfoInstances = minf_instances
1658 modInfoIsExportedName :: ModuleInfo -> Name -> Bool
1659 modInfoIsExportedName minf name = elemNameSet name (minf_exports minf)
1661 modInfoPrintUnqualified :: ModuleInfo -> Maybe PrintUnqualified
1662 modInfoPrintUnqualified minf = fmap unQualInScope (minf_rdr_env minf)
1664 modInfoLookupName :: Session -> ModuleInfo -> Name -> IO (Maybe TyThing)
1665 modInfoLookupName s minf name = withSession s $ \hsc_env -> do
1666 case lookupTypeEnv (minf_type_env minf) name of
1667 Just tyThing -> return (Just tyThing)
1669 eps <- readIORef (hsc_EPS hsc_env)
1670 return $! lookupType (hsc_HPT hsc_env) (eps_PTE eps) name
1672 isDictonaryId :: Id -> Bool
1674 = case tcSplitSigmaTy (idType id) of { (tvs, theta, tau) -> isDictTy tau }
1676 -- | Looks up a global name: that is, any top-level name in any
1677 -- visible module. Unlike 'lookupName', lookupGlobalName does not use
1678 -- the interactive context, and therefore does not require a preceding
1680 lookupGlobalName :: Session -> Name -> IO (Maybe TyThing)
1681 lookupGlobalName s name = withSession s $ \hsc_env -> do
1682 eps <- readIORef (hsc_EPS hsc_env)
1683 return $! lookupType (hsc_HPT hsc_env) (eps_PTE eps) name
1689 | BinaryCode FilePath
1691 -- ToDo: typechecks abstract syntax or renamed abstract syntax. Issues:
1692 -- - typechecked syntax includes extra dictionary translation and
1693 -- AbsBinds which need to be translated back into something closer to
1694 -- the original source.
1697 -- - Data and Typeable instances for HsSyn.
1700 -- - things that aren't in the output of the renamer:
1701 -- - the export list
1705 -- - things that aren't in the output of the typechecker right now:
1706 -- - the export list
1708 -- - type signatures
1709 -- - type/data/newtype declarations
1710 -- - class declarations
1712 -- - extra things in the typechecker's output:
1713 -- - default methods are turned into top-level decls.
1714 -- - dictionary bindings
1716 -- ToDo: check for small transformations that happen to the syntax in
1717 -- the typechecker (eg. -e ==> negate e, perhaps for fromIntegral)
1719 -- ToDo: maybe use TH syntax instead of IfaceSyn? There's already a way
1720 -- to get from TyCons, Ids etc. to TH syntax (reify).
1722 -- :browse will use either lm_toplev or inspect lm_interface, depending
1723 -- on whether the module is interpreted or not.
1725 -- This is for reconstructing refactored source code
1726 -- Calls the lexer repeatedly.
1727 -- ToDo: add comment tokens to token stream
1728 getTokenStream :: Session -> Module -> IO [Located Token]
1731 -- -----------------------------------------------------------------------------
1732 -- Interactive evaluation
1736 -- | Set the interactive evaluation context.
1738 -- Setting the context doesn't throw away any bindings; the bindings
1739 -- we've built up in the InteractiveContext simply move to the new
1740 -- module. They always shadow anything in scope in the current context.
1741 setContext :: Session
1742 -> [Module] -- entire top level scope of these modules
1743 -> [Module] -- exports only of these modules
1745 setContext (Session ref) toplevs exports = do
1746 hsc_env <- readIORef ref
1747 let old_ic = hsc_IC hsc_env
1748 hpt = hsc_HPT hsc_env
1750 mapM_ (checkModuleExists hsc_env hpt) exports
1751 export_env <- mkExportEnv hsc_env exports
1752 toplev_envs <- mapM (mkTopLevEnv hpt) toplevs
1753 let all_env = foldr plusGlobalRdrEnv export_env toplev_envs
1754 writeIORef ref hsc_env{ hsc_IC = old_ic { ic_toplev_scope = toplevs,
1755 ic_exports = exports,
1756 ic_rn_gbl_env = all_env } }
1758 -- Make a GlobalRdrEnv based on the exports of the modules only.
1759 mkExportEnv :: HscEnv -> [Module] -> IO GlobalRdrEnv
1760 mkExportEnv hsc_env mods = do
1761 stuff <- mapM (getModuleExports hsc_env) mods
1763 (_msgs, mb_name_sets) = unzip stuff
1764 gres = [ nameSetToGlobalRdrEnv name_set mod
1765 | (Just name_set, mod) <- zip mb_name_sets mods ]
1767 return $! foldr plusGlobalRdrEnv emptyGlobalRdrEnv gres
1769 nameSetToGlobalRdrEnv :: NameSet -> Module -> GlobalRdrEnv
1770 nameSetToGlobalRdrEnv names mod =
1771 mkGlobalRdrEnv [ GRE { gre_name = name, gre_prov = vanillaProv mod }
1772 | name <- nameSetToList names ]
1774 vanillaProv :: Module -> Provenance
1775 -- We're building a GlobalRdrEnv as if the user imported
1776 -- all the specified modules into the global interactive module
1777 vanillaProv mod = Imported [ImpSpec { is_decl = decl, is_item = ImpAll}]
1779 decl = ImpDeclSpec { is_mod = mod, is_as = mod,
1781 is_dloc = srcLocSpan interactiveSrcLoc }
1783 checkModuleExists :: HscEnv -> HomePackageTable -> Module -> IO ()
1784 checkModuleExists hsc_env hpt mod =
1785 case lookupModuleEnv hpt mod of
1786 Just mod_info -> return ()
1787 _not_a_home_module -> do
1788 res <- findPackageModule hsc_env mod True
1790 Found _ _ -> return ()
1791 err -> let msg = cantFindError (hsc_dflags hsc_env) mod err in
1792 throwDyn (CmdLineError (showSDoc msg))
1794 mkTopLevEnv :: HomePackageTable -> Module -> IO GlobalRdrEnv
1795 mkTopLevEnv hpt modl
1796 = case lookupModuleEnv hpt modl of
1798 throwDyn (ProgramError ("mkTopLevEnv: not a home module "
1799 ++ showSDoc (pprModule modl)))
1801 case mi_globals (hm_iface details) of
1803 throwDyn (ProgramError ("mkTopLevEnv: not interpreted "
1804 ++ showSDoc (pprModule modl)))
1805 Just env -> return env
1807 -- | Get the interactive evaluation context, consisting of a pair of the
1808 -- set of modules from which we take the full top-level scope, and the set
1809 -- of modules from which we take just the exports respectively.
1810 getContext :: Session -> IO ([Module],[Module])
1811 getContext s = withSession s (\HscEnv{ hsc_IC=ic } ->
1812 return (ic_toplev_scope ic, ic_exports ic))
1814 -- | Returns 'True' if the specified module is interpreted, and hence has
1815 -- its full top-level scope available.
1816 moduleIsInterpreted :: Session -> Module -> IO Bool
1817 moduleIsInterpreted s modl = withSession s $ \h ->
1818 case lookupModuleEnv (hsc_HPT h) modl of
1819 Just details -> return (isJust (mi_globals (hm_iface details)))
1820 _not_a_home_module -> return False
1822 -- | Looks up an identifier in the current interactive context (for :info)
1823 getInfo :: Session -> Name -> IO (Maybe (TyThing,Fixity,[Instance]))
1824 getInfo s name = withSession s $ \hsc_env -> tcRnGetInfo hsc_env name
1826 -- | Returns all names in scope in the current interactive context
1827 getNamesInScope :: Session -> IO [Name]
1828 getNamesInScope s = withSession s $ \hsc_env -> do
1829 return (map gre_name (globalRdrEnvElts (ic_rn_gbl_env (hsc_IC hsc_env))))
1831 -- | Parses a string as an identifier, and returns the list of 'Name's that
1832 -- the identifier can refer to in the current interactive context.
1833 parseName :: Session -> String -> IO [Name]
1834 parseName s str = withSession s $ \hsc_env -> do
1835 maybe_rdr_name <- hscParseIdentifier (hsc_dflags hsc_env) str
1836 case maybe_rdr_name of
1837 Nothing -> return []
1838 Just (L _ rdr_name) -> do
1839 mb_names <- tcRnLookupRdrName hsc_env rdr_name
1841 Nothing -> return []
1842 Just ns -> return ns
1843 -- ToDo: should return error messages
1845 -- | Returns the 'TyThing' for a 'Name'. The 'Name' may refer to any
1846 -- entity known to GHC, including 'Name's defined using 'runStmt'.
1847 lookupName :: Session -> Name -> IO (Maybe TyThing)
1848 lookupName s name = withSession s $ \hsc_env -> tcRnLookupName hsc_env name
1850 -- -----------------------------------------------------------------------------
1851 -- Misc exported utils
1853 dataConType :: DataCon -> Type
1854 dataConType dc = idType (dataConWrapId dc)
1856 -- | print a 'NamedThing', adding parentheses if the name is an operator.
1857 pprParenSymName :: NamedThing a => a -> SDoc
1858 pprParenSymName a = parenSymOcc (getOccName a) (ppr (getName a))
1860 -- -----------------------------------------------------------------------------
1861 -- Getting the type of an expression
1863 -- | Get the type of an expression
1864 exprType :: Session -> String -> IO (Maybe Type)
1865 exprType s expr = withSession s $ \hsc_env -> do
1866 maybe_stuff <- hscTcExpr hsc_env expr
1868 Nothing -> return Nothing
1869 Just ty -> return (Just tidy_ty)
1871 tidy_ty = tidyType emptyTidyEnv ty
1873 -- -----------------------------------------------------------------------------
1874 -- Getting the kind of a type
1876 -- | Get the kind of a type
1877 typeKind :: Session -> String -> IO (Maybe Kind)
1878 typeKind s str = withSession s $ \hsc_env -> do
1879 maybe_stuff <- hscKcType hsc_env str
1881 Nothing -> return Nothing
1882 Just kind -> return (Just kind)
1884 -----------------------------------------------------------------------------
1885 -- cmCompileExpr: compile an expression and deliver an HValue
1887 compileExpr :: Session -> String -> IO (Maybe HValue)
1888 compileExpr s expr = withSession s $ \hsc_env -> do
1889 maybe_stuff <- hscStmt hsc_env ("let __cmCompileExpr = "++expr)
1891 Nothing -> return Nothing
1892 Just (new_ic, names, hval) -> do
1894 hvals <- (unsafeCoerce# hval) :: IO [HValue]
1896 case (names,hvals) of
1897 ([n],[hv]) -> return (Just hv)
1898 _ -> panic "compileExpr"
1900 -- -----------------------------------------------------------------------------
1901 -- running a statement interactively
1904 = RunOk [Name] -- ^ names bound by this evaluation
1905 | RunFailed -- ^ statement failed compilation
1906 | RunException Exception -- ^ statement raised an exception
1908 -- | Run a statement in the current interactive context. Statemenet
1909 -- may bind multple values.
1910 runStmt :: Session -> String -> IO RunResult
1911 runStmt (Session ref) expr
1913 hsc_env <- readIORef ref
1915 -- Turn off -fwarn-unused-bindings when running a statement, to hide
1916 -- warnings about the implicit bindings we introduce.
1917 let dflags' = dopt_unset (hsc_dflags hsc_env) Opt_WarnUnusedBinds
1918 hsc_env' = hsc_env{ hsc_dflags = dflags' }
1920 maybe_stuff <- hscStmt hsc_env' expr
1923 Nothing -> return RunFailed
1924 Just (new_hsc_env, names, hval) -> do
1926 let thing_to_run = unsafeCoerce# hval :: IO [HValue]
1927 either_hvals <- sandboxIO thing_to_run
1929 case either_hvals of
1931 -- on error, keep the *old* interactive context,
1932 -- so that 'it' is not bound to something
1933 -- that doesn't exist.
1934 return (RunException e)
1937 -- Get the newly bound things, and bind them.
1938 -- Don't need to delete any shadowed bindings;
1939 -- the new ones override the old ones.
1940 extendLinkEnv (zip names hvals)
1942 writeIORef ref new_hsc_env
1943 return (RunOk names)
1946 -- We run the statement in a "sandbox" to protect the rest of the
1947 -- system from anything the expression might do. For now, this
1948 -- consists of just wrapping it in an exception handler, but see below
1949 -- for another version.
1951 sandboxIO :: IO a -> IO (Either Exception a)
1952 sandboxIO thing = Exception.try thing
1955 -- This version of sandboxIO runs the expression in a completely new
1956 -- RTS main thread. It is disabled for now because ^C exceptions
1957 -- won't be delivered to the new thread, instead they'll be delivered
1958 -- to the (blocked) GHCi main thread.
1960 -- SLPJ: when re-enabling this, reflect a wrong-stat error as an exception
1962 sandboxIO :: IO a -> IO (Either Int (Either Exception a))
1963 sandboxIO thing = do
1964 st_thing <- newStablePtr (Exception.try thing)
1965 alloca $ \ p_st_result -> do
1966 stat <- rts_evalStableIO st_thing p_st_result
1967 freeStablePtr st_thing
1969 then do st_result <- peek p_st_result
1970 result <- deRefStablePtr st_result
1971 freeStablePtr st_result
1972 return (Right result)
1974 return (Left (fromIntegral stat))
1976 foreign import "rts_evalStableIO" {- safe -}
1977 rts_evalStableIO :: StablePtr (IO a) -> Ptr (StablePtr a) -> IO CInt
1978 -- more informative than the C type!
1981 -----------------------------------------------------------------------------
1982 -- show a module and it's source/object filenames
1984 showModule :: Session -> ModSummary -> IO String
1985 showModule s mod_summary = withSession s $ \hsc_env -> do
1986 case lookupModuleEnv (hsc_HPT hsc_env) (ms_mod mod_summary) of
1987 Nothing -> panic "missing linkable"
1988 Just mod_info -> return (showModMsg obj_linkable mod_summary)
1990 obj_linkable = isObjectLinkable (fromJust (hm_linkable mod_info))