1 -- -----------------------------------------------------------------------------
3 -- (c) The University of Glasgow, 2005
7 -- -----------------------------------------------------------------------------
13 defaultCleanupHandler,
17 -- * Flags and settings
18 DynFlags(..), DynFlag(..), GhcMode(..), HscTarget(..), dopt,
26 Target(..), TargetId(..),
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,
54 modInfoIsExportedName,
58 -- * Interactive evaluation
59 getBindings, getPrintUnqual,
61 setContext, getContext,
64 getInfo, GetInfoResult,
76 -- * Abstract syntax elements
79 Module, mkModule, pprModule,
86 isImplicitId, isDeadBinder,
87 isSpecPragmaId, isExportedId, isLocalId, isGlobalId,
89 isPrimOpId, isFCallId,
90 isDataConWorkId, idDataCon,
91 isBottomingId, isDictonaryId,
93 -- ** Type constructors
95 isClassTyCon, isSynTyCon, isNewTyCon,
97 -- ** Data constructors
102 classSCTheta, classTvsFds,
104 -- ** Types and Kinds
112 module HsSyn, -- ToDo: remove extraneous bits
115 GhcException(..), showGhcException,
125 * inline bits of HscMain here to simplify layering: hscGetInfo,
127 * we need to expose DynFlags, so should parseDynamicFlags really be
128 part of this interface?
129 * what StaticFlags should we expose, if any?
132 #include "HsVersions.h"
135 import qualified Linker
136 import Linker ( HValue, extendLinkEnv )
137 import NameEnv ( lookupNameEnv )
138 import TcRnDriver ( getModuleContents, tcRnLookupRdrName,
140 import RdrName ( plusGlobalRdrEnv, Provenance(..), ImportSpec(..),
141 emptyGlobalRdrEnv, mkGlobalRdrEnv )
142 import HscMain ( hscGetInfo, GetInfoResult, hscParseIdentifier,
143 hscStmt, hscTcExpr, hscKcType )
144 import Type ( tidyType )
145 import VarEnv ( emptyTidyEnv )
146 import GHC.Exts ( unsafeCoerce# )
147 import IfaceSyn ( IfaceDecl )
148 import Name ( getName, nameModule_maybe )
149 import SrcLoc ( mkSrcLoc, srcLocSpan, interactiveSrcLoc )
150 import Bag ( unitBag, emptyBag )
153 import Packages ( initPackages )
154 import NameSet ( NameSet, nameSetToList, elemNameSet )
155 import RdrName ( GlobalRdrEnv, GlobalRdrElt(..), RdrName, gre_name,
158 import Type ( Kind, Type, dropForAlls )
159 import Id ( Id, idType, isImplicitId, isDeadBinder,
160 isSpecPragmaId, isExportedId, isLocalId, isGlobalId,
162 isPrimOpId, isFCallId,
163 isDataConWorkId, idDataCon,
165 import TyCon ( TyCon, isClassTyCon, isSynTyCon, isNewTyCon )
166 import Class ( Class, classSCTheta, classTvsFds )
167 import DataCon ( DataCon )
168 import Name ( Name, nameModule )
169 import NameEnv ( nameEnvElts )
170 import SrcLoc ( Located(..) )
171 import DriverPipeline
172 import DriverPhases ( Phase(..), isHaskellSrcFilename, startPhase )
173 import GetImports ( getImports )
174 import Packages ( isHomePackage )
176 import HscMain ( newHscEnv, hscFileCheck, HscResult(..) )
180 import SysTools ( initSysTools, cleanTempFiles )
185 import ErrUtils ( showPass, Messages, putMsg, debugTraceMsg )
186 import qualified ErrUtils
188 import StringBuffer ( StringBuffer, hGetStringBuffer )
190 import SysTools ( cleanTempFilesExcept )
191 import BasicTypes ( SuccessFlag(..), succeeded, failed )
192 import Maybes ( orElse, expectJust, mapCatMaybes )
193 import TcType ( tcSplitSigmaTy, isDictTy )
194 import FastString ( mkFastString )
196 import Directory ( getModificationTime, doesFileExist )
197 import Maybe ( isJust, isNothing, fromJust, fromMaybe, catMaybes )
198 import Maybes ( expectJust )
199 import List ( partition, nub )
200 import qualified List
201 import Monad ( unless, when, foldM )
202 import System ( exitWith, ExitCode(..) )
203 import Time ( ClockTime )
204 import EXCEPTION as Exception hiding (handle)
207 import Prelude hiding (init)
209 -- -----------------------------------------------------------------------------
210 -- Exception handlers
212 -- | Install some default exception handlers and run the inner computation.
213 -- Unless you want to handle exceptions yourself, you should wrap this around
214 -- the top level of your program. The default handlers output the error
215 -- message(s) to stderr and exit cleanly.
216 defaultErrorHandler :: IO a -> IO a
217 defaultErrorHandler inner =
218 -- top-level exception handler: any unrecognised exception is a compiler bug.
219 handle (\exception -> do
222 -- an IO exception probably isn't our fault, so don't panic
223 IOException _ -> putMsg (show exception)
224 AsyncException StackOverflow ->
225 putMsg "stack overflow: use +RTS -K<size> to increase it"
226 _other -> putMsg (show (Panic (show exception)))
227 exitWith (ExitFailure 1)
230 -- all error messages are propagated as exceptions
231 handleDyn (\dyn -> do
234 PhaseFailed _ code -> exitWith code
235 Interrupted -> exitWith (ExitFailure 1)
236 _ -> do putMsg (show (dyn :: GhcException))
237 exitWith (ExitFailure 1)
241 -- | Install a default cleanup handler to remove temporary files
242 -- deposited by a GHC run. This is seperate from
243 -- 'defaultErrorHandler', because you might want to override the error
244 -- handling, but still get the ordinary cleanup behaviour.
245 defaultCleanupHandler :: DynFlags -> IO a -> IO a
246 defaultCleanupHandler dflags inner =
247 -- make sure we clean up after ourselves
248 later (unless (dopt Opt_KeepTmpFiles dflags) $
249 cleanTempFiles dflags)
250 -- exceptions will be blocked while we clean the temporary files,
251 -- so there shouldn't be any difficulty if we receive further
256 -- | Initialises GHC. This must be done /once/ only. Takes the
257 -- command-line arguments. All command-line arguments which aren't
258 -- understood by GHC will be returned.
260 init :: [String] -> IO [String]
263 installSignalHandlers
265 -- Grab the -B option if there is one
266 let (minusB_args, argv1) = partition (prefixMatch "-B") args
267 dflags0 <- initSysTools minusB_args defaultDynFlags
268 writeIORef v_initDynFlags dflags0
270 -- Parse the static flags
271 argv2 <- parseStaticFlags argv1
274 GLOBAL_VAR(v_initDynFlags, error "initDynFlags", DynFlags)
275 -- stores the DynFlags between the call to init and subsequent
276 -- calls to newSession.
278 -- | Starts a new session. A session consists of a set of loaded
279 -- modules, a set of options (DynFlags), and an interactive context.
280 -- ToDo: GhcMode should say "keep typechecked code" and\/or "keep renamed
282 newSession :: GhcMode -> IO Session
284 dflags0 <- readIORef v_initDynFlags
285 dflags <- initDynFlags dflags0
286 env <- newHscEnv dflags{ ghcMode=mode }
290 -- tmp: this breaks the abstraction, but required because DriverMkDepend
291 -- needs to call the Finder. ToDo: untangle this.
292 sessionHscEnv :: Session -> IO HscEnv
293 sessionHscEnv (Session ref) = readIORef ref
295 withSession :: Session -> (HscEnv -> IO a) -> IO a
296 withSession (Session ref) f = do h <- readIORef ref; f h
298 modifySession :: Session -> (HscEnv -> HscEnv) -> IO ()
299 modifySession (Session ref) f = do h <- readIORef ref; writeIORef ref $! f h
301 -- -----------------------------------------------------------------------------
304 -- | Grabs the DynFlags from the Session
305 getSessionDynFlags :: Session -> IO DynFlags
306 getSessionDynFlags s = withSession s (return . hsc_dflags)
308 -- | Updates the DynFlags in a Session
309 setSessionDynFlags :: Session -> DynFlags -> IO ()
310 setSessionDynFlags s dflags = modifySession s (\h -> h{ hsc_dflags = dflags })
312 -- | Messages during compilation (eg. warnings and progress messages)
313 -- are reported using this callback. By default, these messages are
314 -- printed to stderr.
315 setMsgHandler :: (String -> IO ()) -> IO ()
316 setMsgHandler = ErrUtils.setMsgHandler
318 -- -----------------------------------------------------------------------------
321 -- ToDo: think about relative vs. absolute file paths. And what
322 -- happens when the current directory changes.
324 -- | Sets the targets for this session. Each target may be a module name
325 -- or a filename. The targets correspond to the set of root modules for
326 -- the program\/library. Unloading the current program is achieved by
327 -- setting the current set of targets to be empty, followed by load.
328 setTargets :: Session -> [Target] -> IO ()
329 setTargets s targets = modifySession s (\h -> h{ hsc_targets = targets })
331 -- | returns the current set of targets
332 getTargets :: Session -> IO [Target]
333 getTargets s = withSession s (return . hsc_targets)
335 -- | Add another target
336 addTarget :: Session -> Target -> IO ()
338 = modifySession s (\h -> h{ hsc_targets = target : hsc_targets h })
341 removeTarget :: Session -> TargetId -> IO ()
342 removeTarget s target_id
343 = modifySession s (\h -> h{ hsc_targets = filter (hsc_targets h) })
345 filter targets = [ t | t@(Target id _) <- targets, id /= target_id ]
347 -- Attempts to guess what Target a string refers to. This function implements
348 -- the --make/GHCi command-line syntax for filenames:
350 -- - if the string looks like a Haskell source filename, then interpret
352 -- - if adding a .hs or .lhs suffix yields the name of an existing file,
354 -- - otherwise interpret the string as a module name
356 guessTarget :: String -> IO Target
358 | isHaskellSrcFilename file
359 = return (Target (TargetFile file) Nothing)
361 = do exists <- doesFileExist hs_file
362 if exists then return (Target (TargetFile hs_file) Nothing) else do
363 exists <- doesFileExist lhs_file
364 if exists then return (Target (TargetFile lhs_file) Nothing) else do
365 return (Target (TargetModule (mkModule file)) Nothing)
367 hs_file = file ++ ".hs"
368 lhs_file = file ++ ".lhs"
370 -- -----------------------------------------------------------------------------
371 -- Loading the program
373 -- Perform a dependency analysis starting from the current targets
374 -- and update the session with the new module graph.
375 depanal :: Session -> [Module] -> IO ()
376 depanal (Session ref) excluded_mods = do
377 hsc_env <- readIORef ref
379 dflags = hsc_dflags hsc_env
380 gmode = ghcMode (hsc_dflags hsc_env)
381 targets = hsc_targets hsc_env
382 old_graph = hsc_mod_graph hsc_env
384 showPass dflags "Chasing dependencies"
385 when (gmode == BatchCompile) $
386 debugTraceMsg dflags 1 (showSDoc (hcat [
387 text "Chasing modules from: ",
388 hcat (punctuate comma (map pprTarget targets))]))
390 graph <- downsweep hsc_env old_graph excluded_mods
391 writeIORef ref hsc_env{ hsc_mod_graph=graph }
394 -- | The result of load.
396 = LoadOk Errors -- ^ all specified targets were loaded successfully.
397 | LoadFailed Errors -- ^ not all modules were loaded.
399 type Errors = [String]
401 data ErrMsg = ErrMsg {
402 errMsgSeverity :: Severity, -- warning, error, etc.
403 errMsgSpans :: [SrcSpan],
404 errMsgShortDoc :: Doc,
405 errMsgExtraInfo :: Doc
412 | LoadDependenciesOf Module
414 -- | Try to load the program. If a Module is supplied, then just
415 -- attempt to load up to this target. If no Module is supplied,
416 -- then try to load all targets.
417 load :: Session -> LoadHowMuch -> IO SuccessFlag
418 load session how_much =
419 loadMsgs session how_much ErrUtils.printErrorsAndWarnings
421 -- | Version of 'load' that takes a callback function to be invoked
422 -- on compiler errors and warnings as they occur during compilation.
423 loadMsgs :: Session -> LoadHowMuch -> (Messages-> IO ()) -> IO SuccessFlag
424 loadMsgs s@(Session ref) how_much msg_act
426 -- Dependency analysis first. Note that this fixes the module graph:
427 -- even if we don't get a fully successful upsweep, the full module
428 -- graph is still retained in the Session. We can tell which modules
429 -- were successfully loaded by inspecting the Session's HPT.
432 hsc_env <- readIORef ref
434 let hpt1 = hsc_HPT hsc_env
435 let dflags = hsc_dflags hsc_env
436 let mod_graph = hsc_mod_graph hsc_env
438 let ghci_mode = ghcMode (hsc_dflags hsc_env) -- this never changes
439 let verb = verbosity dflags
441 -- The "bad" boot modules are the ones for which we have
442 -- B.hs-boot in the module graph, but no B.hs
443 -- The downsweep should have ensured this does not happen
445 let all_home_mods = [ms_mod s | s <- mod_graph, not (isBootSummary s)]
446 bad_boot_mods = [s | s <- mod_graph, isBootSummary s,
447 not (ms_mod s `elem` all_home_mods)]
448 ASSERT( null bad_boot_mods ) return ()
450 -- mg2_with_srcimps drops the hi-boot nodes, returning a
451 -- graph with cycles. Among other things, it is used for
452 -- backing out partially complete cycles following a failed
453 -- upsweep, and for removing from hpt all the modules
454 -- not in strict downwards closure, during calls to compile.
455 let mg2_with_srcimps :: [SCC ModSummary]
456 mg2_with_srcimps = topSortModuleGraph True mod_graph Nothing
458 -- check the stability property for each module.
459 stable_mods@(stable_obj,stable_bco)
460 | BatchCompile <- ghci_mode = ([],[])
461 | otherwise = checkStability hpt1 mg2_with_srcimps all_home_mods
463 -- prune bits of the HPT which are definitely redundant now,
465 pruned_hpt = pruneHomePackageTable hpt1
466 (flattenSCCs mg2_with_srcimps)
471 debugTraceMsg dflags 2 (showSDoc (text "Stable obj:" <+> ppr stable_obj $$
472 text "Stable BCO:" <+> ppr stable_bco))
474 -- Unload any modules which are going to be re-linked this time around.
475 let stable_linkables = [ linkable
476 | m <- stable_obj++stable_bco,
477 Just hmi <- [lookupModuleEnv pruned_hpt m],
478 Just linkable <- [hm_linkable hmi] ]
479 unload hsc_env stable_linkables
481 -- We could at this point detect cycles which aren't broken by
482 -- a source-import, and complain immediately, but it seems better
483 -- to let upsweep_mods do this, so at least some useful work gets
484 -- done before the upsweep is abandoned.
485 --hPutStrLn stderr "after tsort:\n"
486 --hPutStrLn stderr (showSDoc (vcat (map ppr mg2)))
488 -- Now do the upsweep, calling compile for each module in
489 -- turn. Final result is version 3 of everything.
491 -- Topologically sort the module graph, this time including hi-boot
492 -- nodes, and possibly just including the portion of the graph
493 -- reachable from the module specified in the 2nd argument to load.
494 -- This graph should be cycle-free.
495 -- If we're restricting the upsweep to a portion of the graph, we
496 -- also want to retain everything that is still stable.
497 let full_mg :: [SCC ModSummary]
498 full_mg = topSortModuleGraph False mod_graph Nothing
500 maybe_top_mod = case how_much of
502 LoadDependenciesOf m -> Just m
505 partial_mg0 :: [SCC ModSummary]
506 partial_mg0 = topSortModuleGraph False mod_graph maybe_top_mod
508 -- LoadDependenciesOf m: we want the upsweep to stop just
509 -- short of the specified module (unless the specified module
512 | LoadDependenciesOf mod <- how_much
513 = ASSERT( case last partial_mg0 of
514 AcyclicSCC ms -> ms_mod ms == mod; _ -> False )
515 List.init partial_mg0
521 | AcyclicSCC ms <- full_mg,
522 ms_mod ms `elem` stable_obj++stable_bco,
523 ms_mod ms `notElem` [ ms_mod ms' |
524 AcyclicSCC ms' <- partial_mg ] ]
526 mg = stable_mg ++ partial_mg
528 -- clean up between compilations
529 let cleanup = cleanTempFilesExcept dflags
530 (ppFilesFromSummaries (flattenSCCs mg2_with_srcimps))
532 (upsweep_ok, hsc_env1, modsUpswept)
533 <- upsweep (hsc_env { hsc_HPT = emptyHomePackageTable })
534 pruned_hpt stable_mods cleanup msg_act mg
536 -- Make modsDone be the summaries for each home module now
537 -- available; this should equal the domain of hpt3.
538 -- Get in in a roughly top .. bottom order (hence reverse).
540 let modsDone = reverse modsUpswept
542 -- Try and do linking in some form, depending on whether the
543 -- upsweep was completely or only partially successful.
545 if succeeded upsweep_ok
548 -- Easy; just relink it all.
549 do debugTraceMsg dflags 2 "Upsweep completely successful."
551 -- Clean up after ourselves
552 cleanTempFilesExcept dflags (ppFilesFromSummaries modsDone)
554 -- Issue a warning for the confusing case where the user
555 -- said '-o foo' but we're not going to do any linking.
556 -- We attempt linking if either (a) one of the modules is
557 -- called Main, or (b) the user said -no-hs-main, indicating
558 -- that main() is going to come from somewhere else.
560 let ofile = outputFile dflags
561 let no_hs_main = dopt Opt_NoHsMain dflags
562 let mb_main_mod = mainModIs dflags
564 main_mod = mb_main_mod `orElse` "Main"
566 = any ((==main_mod).moduleUserString.ms_mod)
568 do_linking = a_root_is_Main || no_hs_main
570 when (ghci_mode == BatchCompile && isJust ofile && not do_linking) $
571 debugTraceMsg dflags 1 ("Warning: output was redirected with -o, " ++
572 "but no output will be generated\n" ++
573 "because there is no " ++ main_mod ++ " module.")
575 -- link everything together
576 linkresult <- link ghci_mode dflags do_linking (hsc_HPT hsc_env1)
578 loadFinish Succeeded linkresult ref hsc_env1
581 -- Tricky. We need to back out the effects of compiling any
582 -- half-done cycles, both so as to clean up the top level envs
583 -- and to avoid telling the interactive linker to link them.
584 do debugTraceMsg dflags 2 "Upsweep partially successful."
587 = map ms_mod modsDone
588 let mods_to_zap_names
589 = findPartiallyCompletedCycles modsDone_names
592 = filter ((`notElem` mods_to_zap_names).ms_mod)
595 let hpt4 = retainInTopLevelEnvs (map ms_mod mods_to_keep)
598 -- Clean up after ourselves
599 cleanTempFilesExcept dflags (ppFilesFromSummaries mods_to_keep)
601 -- there should be no Nothings where linkables should be, now
602 ASSERT(all (isJust.hm_linkable)
603 (moduleEnvElts (hsc_HPT hsc_env))) do
605 -- Link everything together
606 linkresult <- link ghci_mode dflags False hpt4
608 let hsc_env4 = hsc_env1{ hsc_HPT = hpt4 }
609 loadFinish Failed linkresult ref hsc_env4
611 -- Finish up after a load.
613 -- If the link failed, unload everything and return.
614 loadFinish all_ok Failed ref hsc_env
615 = do unload hsc_env []
616 writeIORef ref $! discardProg hsc_env
619 -- Empty the interactive context and set the module context to the topmost
620 -- newly loaded module, or the Prelude if none were loaded.
621 loadFinish all_ok Succeeded ref hsc_env
622 = do writeIORef ref $! hsc_env{ hsc_IC = emptyInteractiveContext }
626 -- Forget the current program, but retain the persistent info in HscEnv
627 discardProg :: HscEnv -> HscEnv
629 = hsc_env { hsc_mod_graph = emptyMG,
630 hsc_IC = emptyInteractiveContext,
631 hsc_HPT = emptyHomePackageTable }
633 -- used to fish out the preprocess output files for the purposes of
634 -- cleaning up. The preprocessed file *might* be the same as the
635 -- source file, but that doesn't do any harm.
636 ppFilesFromSummaries summaries = [ fn | Just fn <- map ms_hspp_file summaries ]
638 -- -----------------------------------------------------------------------------
642 CheckedModule { parsedSource :: ParsedSource,
643 renamedSource :: Maybe RenamedSource,
644 typecheckedSource :: Maybe TypecheckedSource,
645 checkedModuleInfo :: Maybe ModuleInfo
648 type ParsedSource = Located (HsModule RdrName)
649 type RenamedSource = HsGroup Name
650 type TypecheckedSource = LHsBinds Id
652 -- | This is the way to get access to parsed and typechecked source code
653 -- for a module. 'checkModule' loads all the dependencies of the specified
654 -- module in the Session, and then attempts to typecheck the module. If
655 -- successful, it returns the abstract syntax for the module.
656 checkModule :: Session -> Module -> (Messages -> IO ())
657 -> IO (Maybe CheckedModule)
658 checkModule session@(Session ref) mod msg_act = do
659 -- load up the dependencies first
660 r <- loadMsgs session (LoadDependenciesOf mod) msg_act
661 if (failed r) then return Nothing else do
663 -- now parse & typecheck the module
664 hsc_env <- readIORef ref
665 let mg = hsc_mod_graph hsc_env
666 case [ ms | ms <- mg, ms_mod ms == mod ] of
669 -- Add in the OPTIONS from the source file This is nasty:
670 -- we've done this once already, in the compilation manager
671 -- It might be better to cache the flags in the
672 -- ml_hspp_file field, say
673 let dflags0 = hsc_dflags hsc_env
674 hspp_buf = expectJust "GHC.checkModule" (ms_hspp_buf ms)
675 opts = getOptionsFromStringBuffer hspp_buf
676 (dflags1,leftovers) <- parseDynamicFlags dflags0 (map snd opts)
677 if (not (null leftovers))
678 then do let filename = fromJust (ml_hs_file (ms_location ms))
679 msg_act (optionsErrorMsgs leftovers opts filename)
683 r <- hscFileCheck hsc_env{hsc_dflags=dflags1} msg_act ms
687 HscChecked parsed renamed Nothing ->
688 return (Just (CheckedModule {
689 parsedSource = parsed,
690 renamedSource = renamed,
691 typecheckedSource = Nothing,
692 checkedModuleInfo = Nothing }))
693 HscChecked parsed renamed
694 (Just (tc_binds, rdr_env, details)) -> do
695 let minf = ModuleInfo {
696 minf_type_env = md_types details,
697 minf_exports = md_exports details,
698 minf_rdr_env = Just rdr_env
700 return (Just (CheckedModule {
701 parsedSource = parsed,
702 renamedSource = renamed,
703 typecheckedSource = Just tc_binds,
704 checkedModuleInfo = Just minf }))
706 -- ---------------------------------------------------------------------------
709 unload :: HscEnv -> [Linkable] -> IO ()
710 unload hsc_env stable_linkables -- Unload everthing *except* 'stable_linkables'
711 = case ghcMode (hsc_dflags hsc_env) of
712 BatchCompile -> return ()
713 JustTypecheck -> return ()
715 Interactive -> Linker.unload (hsc_dflags hsc_env) stable_linkables
717 Interactive -> panic "unload: no interpreter"
719 other -> panic "unload: strange mode"
721 -- -----------------------------------------------------------------------------
725 Stability tells us which modules definitely do not need to be recompiled.
726 There are two main reasons for having stability:
728 - avoid doing a complete upsweep of the module graph in GHCi when
729 modules near the bottom of the tree have not changed.
731 - to tell GHCi when it can load object code: we can only load object code
732 for a module when we also load object code fo all of the imports of the
733 module. So we need to know that we will definitely not be recompiling
734 any of these modules, and we can use the object code.
736 NB. stability is of no importance to BatchCompile at all, only Interactive.
737 (ToDo: what about JustTypecheck?)
739 The stability check is as follows. Both stableObject and
740 stableBCO are used during the upsweep phase later.
743 stable m = stableObject m || stableBCO m
746 all stableObject (imports m)
747 && old linkable does not exist, or is == on-disk .o
748 && date(on-disk .o) > date(.hs)
751 all stable (imports m)
752 && date(BCO) > date(.hs)
755 These properties embody the following ideas:
757 - if a module is stable:
758 - if it has been compiled in a previous pass (present in HPT)
759 then it does not need to be compiled or re-linked.
760 - if it has not been compiled in a previous pass,
761 then we only need to read its .hi file from disk and
762 link it to produce a ModDetails.
764 - if a modules is not stable, we will definitely be at least
765 re-linking, and possibly re-compiling it during the upsweep.
766 All non-stable modules can (and should) therefore be unlinked
769 - Note that objects are only considered stable if they only depend
770 on other objects. We can't link object code against byte code.
774 :: HomePackageTable -- HPT from last compilation
775 -> [SCC ModSummary] -- current module graph (cyclic)
776 -> [Module] -- all home modules
777 -> ([Module], -- stableObject
778 [Module]) -- stableBCO
780 checkStability hpt sccs all_home_mods = foldl checkSCC ([],[]) sccs
782 checkSCC (stable_obj, stable_bco) scc0
783 | stableObjects = (scc_mods ++ stable_obj, stable_bco)
784 | stableBCOs = (stable_obj, scc_mods ++ stable_bco)
785 | otherwise = (stable_obj, stable_bco)
787 scc = flattenSCC scc0
788 scc_mods = map ms_mod scc
789 home_module m = m `elem` all_home_mods && m `notElem` scc_mods
791 scc_allimps = nub (filter home_module (concatMap ms_allimps scc))
792 -- all imports outside the current SCC, but in the home pkg
794 stable_obj_imps = map (`elem` stable_obj) scc_allimps
795 stable_bco_imps = map (`elem` stable_bco) scc_allimps
802 and (zipWith (||) stable_obj_imps stable_bco_imps)
806 | Just t <- ms_obj_date ms = t >= ms_hs_date ms
810 same_as_prev t = case lookupModuleEnv hpt (ms_mod ms) of
812 Just hmi | Just l <- hm_linkable hmi
813 -> isObjectLinkable l && t == linkableTime l
814 -- why '>=' rather than '>' above? If the filesystem stores
815 -- times to the nearset second, we may occasionally find that
816 -- the object & source have the same modification time,
817 -- especially if the source was automatically generated
818 -- and compiled. Using >= is slightly unsafe, but it matches
822 = case lookupModuleEnv hpt (ms_mod ms) of
824 Just hmi | Just l <- hm_linkable hmi ->
825 not (isObjectLinkable l) &&
826 linkableTime l >= ms_hs_date ms
828 ms_allimps :: ModSummary -> [Module]
829 ms_allimps ms = ms_srcimps ms ++ ms_imps ms
831 -- -----------------------------------------------------------------------------
832 -- Prune the HomePackageTable
834 -- Before doing an upsweep, we can throw away:
836 -- - For non-stable modules:
837 -- - all ModDetails, all linked code
838 -- - all unlinked code that is out of date with respect to
841 -- This is VERY IMPORTANT otherwise we'll end up requiring 2x the
842 -- space at the end of the upsweep, because the topmost ModDetails of the
843 -- old HPT holds on to the entire type environment from the previous
846 pruneHomePackageTable
849 -> ([Module],[Module])
852 pruneHomePackageTable hpt summ (stable_obj, stable_bco)
853 = mapModuleEnv prune hpt
855 | is_stable modl = hmi'
856 | otherwise = hmi'{ hm_details = emptyModDetails }
858 modl = mi_module (hm_iface hmi)
859 hmi' | Just l <- hm_linkable hmi, linkableTime l < ms_hs_date ms
860 = hmi{ hm_linkable = Nothing }
863 where ms = expectJust "prune" (lookupModuleEnv ms_map modl)
865 ms_map = mkModuleEnv [(ms_mod ms, ms) | ms <- summ]
867 is_stable m = m `elem` stable_obj || m `elem` stable_bco
869 -- -----------------------------------------------------------------------------
871 -- Return (names of) all those in modsDone who are part of a cycle
872 -- as defined by theGraph.
873 findPartiallyCompletedCycles :: [Module] -> [SCC ModSummary] -> [Module]
874 findPartiallyCompletedCycles modsDone theGraph
878 chew ((AcyclicSCC v):rest) = chew rest -- acyclic? not interesting.
879 chew ((CyclicSCC vs):rest)
880 = let names_in_this_cycle = nub (map ms_mod vs)
882 = nub ([done | done <- modsDone,
883 done `elem` names_in_this_cycle])
884 chewed_rest = chew rest
886 if notNull mods_in_this_cycle
887 && length mods_in_this_cycle < length names_in_this_cycle
888 then mods_in_this_cycle ++ chewed_rest
891 -- -----------------------------------------------------------------------------
894 -- This is where we compile each module in the module graph, in a pass
895 -- from the bottom to the top of the graph.
897 -- There better had not be any cyclic groups here -- we check for them.
900 :: HscEnv -- Includes initially-empty HPT
901 -> HomePackageTable -- HPT from last time round (pruned)
902 -> ([Module],[Module]) -- stable modules (see checkStability)
903 -> IO () -- How to clean up unwanted tmp files
904 -> (Messages -> IO ()) -- Compiler error message callback
905 -> [SCC ModSummary] -- Mods to do (the worklist)
907 HscEnv, -- With an updated HPT
908 [ModSummary]) -- Mods which succeeded
910 upsweep hsc_env old_hpt stable_mods cleanup msg_act mods
911 = upsweep' hsc_env old_hpt stable_mods cleanup msg_act mods 1 (length mods)
913 upsweep' hsc_env old_hpt stable_mods cleanup msg_act
915 = return (Succeeded, hsc_env, [])
917 upsweep' hsc_env old_hpt stable_mods cleanup msg_act
919 = do putMsg (showSDoc (cyclicModuleErr ms))
920 return (Failed, hsc_env, [])
922 upsweep' hsc_env old_hpt stable_mods cleanup msg_act
923 (AcyclicSCC mod:mods) mod_index nmods
924 = do -- putStrLn ("UPSWEEP_MOD: hpt = " ++
925 -- show (map (moduleUserString.moduleName.mi_module.hm_iface)
926 -- (moduleEnvElts (hsc_HPT hsc_env)))
928 mb_mod_info <- upsweep_mod hsc_env old_hpt stable_mods msg_act mod
931 cleanup -- Remove unwanted tmp files between compilations
934 Nothing -> return (Failed, hsc_env, [])
936 { let this_mod = ms_mod mod
938 -- Add new info to hsc_env
939 hpt1 = extendModuleEnv (hsc_HPT hsc_env)
941 hsc_env1 = hsc_env { hsc_HPT = hpt1 }
943 -- Space-saving: delete the old HPT entry
944 -- for mod BUT if mod is a hs-boot
945 -- node, don't delete it. For the
946 -- interface, the HPT entry is probaby for the
947 -- main Haskell source file. Deleting it
948 -- would force .. (what?? --SDM)
949 old_hpt1 | isBootSummary mod = old_hpt
950 | otherwise = delModuleEnv old_hpt this_mod
952 ; (restOK, hsc_env2, modOKs)
953 <- upsweep' hsc_env1 old_hpt1 stable_mods cleanup
954 msg_act mods (mod_index+1) nmods
955 ; return (restOK, hsc_env2, mod:modOKs)
959 -- Compile a single module. Always produce a Linkable for it if
960 -- successful. If no compilation happened, return the old Linkable.
961 upsweep_mod :: HscEnv
963 -> ([Module],[Module])
964 -> (Messages -> IO ())
966 -> Int -- index of module
967 -> Int -- total number of modules
968 -> IO (Maybe HomeModInfo) -- Nothing => Failed
970 upsweep_mod hsc_env old_hpt (stable_obj, stable_bco) msg_act summary mod_index nmods
973 this_mod = ms_mod summary
974 mb_obj_date = ms_obj_date summary
975 obj_fn = ml_obj_file (ms_location summary)
976 hs_date = ms_hs_date summary
978 compile_it :: Maybe Linkable -> IO (Maybe HomeModInfo)
979 compile_it = upsweep_compile hsc_env old_hpt this_mod
980 msg_act summary mod_index nmods
982 case ghcMode (hsc_dflags hsc_env) of
985 -- Batch-compilating is easy: just check whether we have
986 -- an up-to-date object file. If we do, then the compiler
987 -- needs to do a recompilation check.
988 _ | Just obj_date <- mb_obj_date, obj_date >= hs_date -> do
990 findObjectLinkable this_mod obj_fn obj_date
991 compile_it (Just linkable)
998 _ | is_stable_obj, isJust old_hmi ->
1000 -- object is stable, and we have an entry in the
1001 -- old HPT: nothing to do
1003 | is_stable_obj, isNothing old_hmi -> do
1005 findObjectLinkable this_mod obj_fn
1006 (expectJust "upseep1" mb_obj_date)
1007 compile_it (Just linkable)
1008 -- object is stable, but we need to load the interface
1009 -- off disk to make a HMI.
1012 ASSERT(isJust old_hmi) -- must be in the old_hpt
1014 -- BCO is stable: nothing to do
1016 | Just hmi <- old_hmi,
1017 Just l <- hm_linkable hmi, not (isObjectLinkable l),
1018 linkableTime l >= ms_hs_date summary ->
1020 -- we have an old BCO that is up to date with respect
1021 -- to the source: do a recompilation check as normal.
1025 -- no existing code at all: we must recompile.
1027 is_stable_obj = this_mod `elem` stable_obj
1028 is_stable_bco = this_mod `elem` stable_bco
1030 old_hmi = lookupModuleEnv old_hpt this_mod
1032 -- Run hsc to compile a module
1033 upsweep_compile hsc_env old_hpt this_mod msg_act summary
1035 mb_old_linkable = do
1037 -- The old interface is ok if it's in the old HPT
1038 -- a) we're compiling a source file, and the old HPT
1039 -- entry is for a source file
1040 -- b) we're compiling a hs-boot file
1041 -- Case (b) allows an hs-boot file to get the interface of its
1042 -- real source file on the second iteration of the compilation
1043 -- manager, but that does no harm. Otherwise the hs-boot file
1044 -- will always be recompiled
1047 = case lookupModuleEnv old_hpt this_mod of
1049 Just hm_info | isBootSummary summary -> Just iface
1050 | not (mi_boot iface) -> Just iface
1051 | otherwise -> Nothing
1053 iface = hm_iface hm_info
1055 compresult <- compile hsc_env msg_act summary mb_old_linkable mb_old_iface
1059 -- Compilation failed. Compile may still have updated the PCS, tho.
1060 CompErrs -> return Nothing
1062 -- Compilation "succeeded", and may or may not have returned a new
1063 -- linkable (depending on whether compilation was actually performed
1065 CompOK new_details new_iface new_linkable
1066 -> do let new_info = HomeModInfo { hm_iface = new_iface,
1067 hm_details = new_details,
1068 hm_linkable = new_linkable }
1069 return (Just new_info)
1072 -- Filter modules in the HPT
1073 retainInTopLevelEnvs :: [Module] -> HomePackageTable -> HomePackageTable
1074 retainInTopLevelEnvs keep_these hpt
1075 = mkModuleEnv [ (mod, expectJust "retain" mb_mod_info)
1077 , let mb_mod_info = lookupModuleEnv hpt mod
1078 , isJust mb_mod_info ]
1080 -- ---------------------------------------------------------------------------
1081 -- Topological sort of the module graph
1084 :: Bool -- Drop hi-boot nodes? (see below)
1088 -- Calculate SCCs of the module graph, possibly dropping the hi-boot nodes
1089 -- The resulting list of strongly-connected-components is in topologically
1090 -- sorted order, starting with the module(s) at the bottom of the
1091 -- dependency graph (ie compile them first) and ending with the ones at
1094 -- Drop hi-boot nodes (first boolean arg)?
1096 -- False: treat the hi-boot summaries as nodes of the graph,
1097 -- so the graph must be acyclic
1099 -- True: eliminate the hi-boot nodes, and instead pretend
1100 -- the a source-import of Foo is an import of Foo
1101 -- The resulting graph has no hi-boot nodes, but can by cyclic
1103 topSortModuleGraph drop_hs_boot_nodes summaries Nothing
1104 = stronglyConnComp (fst (moduleGraphNodes drop_hs_boot_nodes summaries))
1105 topSortModuleGraph drop_hs_boot_nodes summaries (Just mod)
1106 = stronglyConnComp (map vertex_fn (reachable graph root))
1108 -- restrict the graph to just those modules reachable from
1109 -- the specified module. We do this by building a graph with
1110 -- the full set of nodes, and determining the reachable set from
1111 -- the specified node.
1112 (nodes, lookup_key) = moduleGraphNodes drop_hs_boot_nodes summaries
1113 (graph, vertex_fn, key_fn) = graphFromEdges' nodes
1115 | Just key <- lookup_key HsSrcFile mod, Just v <- key_fn key = v
1116 | otherwise = throwDyn (ProgramError "module does not exist")
1118 moduleGraphNodes :: Bool -> [ModSummary]
1119 -> ([(ModSummary, Int, [Int])], HscSource -> Module -> Maybe Int)
1120 moduleGraphNodes drop_hs_boot_nodes summaries = (nodes, lookup_key)
1122 -- Drop hs-boot nodes by using HsSrcFile as the key
1123 hs_boot_key | drop_hs_boot_nodes = HsSrcFile
1124 | otherwise = HsBootFile
1126 -- We use integers as the keys for the SCC algorithm
1127 nodes :: [(ModSummary, Int, [Int])]
1128 nodes = [(s, expectJust "topSort" (lookup_key (ms_hsc_src s) (ms_mod s)),
1129 out_edge_keys hs_boot_key (ms_srcimps s) ++
1130 out_edge_keys HsSrcFile (ms_imps s) )
1132 , not (isBootSummary s && drop_hs_boot_nodes) ]
1133 -- Drop the hi-boot ones if told to do so
1135 key_map :: NodeMap Int
1136 key_map = listToFM ([(ms_mod s, ms_hsc_src s) | s <- summaries]
1139 lookup_key :: HscSource -> Module -> Maybe Int
1140 lookup_key hs_src mod = lookupFM key_map (mod, hs_src)
1142 out_edge_keys :: HscSource -> [Module] -> [Int]
1143 out_edge_keys hi_boot ms = mapCatMaybes (lookup_key hi_boot) ms
1144 -- If we want keep_hi_boot_nodes, then we do lookup_key with
1145 -- the IsBootInterface parameter True; else False
1148 type NodeKey = (Module, HscSource) -- The nodes of the graph are
1149 type NodeMap a = FiniteMap NodeKey a -- keyed by (mod, src_file_type) pairs
1151 msKey :: ModSummary -> NodeKey
1152 msKey (ModSummary { ms_mod = mod, ms_hsc_src = boot }) = (mod,boot)
1154 emptyNodeMap :: NodeMap a
1155 emptyNodeMap = emptyFM
1157 mkNodeMap :: [ModSummary] -> NodeMap ModSummary
1158 mkNodeMap summaries = listToFM [ (msKey s, s) | s <- summaries]
1160 nodeMapElts :: NodeMap a -> [a]
1161 nodeMapElts = eltsFM
1163 -- -----------------------------------------------------------------
1164 -- The unlinked image
1166 -- The compilation manager keeps a list of compiled, but as-yet unlinked
1167 -- binaries (byte code or object code). Even when it links bytecode
1168 -- it keeps the unlinked version so it can re-link it later without
1171 type UnlinkedImage = [Linkable] -- the unlinked images (should be a set, really)
1173 findModuleLinkable_maybe :: [Linkable] -> Module -> Maybe Linkable
1174 findModuleLinkable_maybe lis mod
1175 = case [LM time nm us | LM time nm us <- lis, nm == mod] of
1178 many -> pprPanic "findModuleLinkable" (ppr mod)
1180 delModuleLinkable :: [Linkable] -> Module -> [Linkable]
1181 delModuleLinkable ls mod = [ l | l@(LM _ nm _) <- ls, nm /= mod ]
1183 -----------------------------------------------------------------------------
1184 -- Downsweep (dependency analysis)
1186 -- Chase downwards from the specified root set, returning summaries
1187 -- for all home modules encountered. Only follow source-import
1190 -- We pass in the previous collection of summaries, which is used as a
1191 -- cache to avoid recalculating a module summary if the source is
1194 -- The returned list of [ModSummary] nodes has one node for each home-package
1195 -- module, plus one for any hs-boot files. The imports of these nodes
1196 -- are all there, including the imports of non-home-package modules.
1199 -> [ModSummary] -- Old summaries
1200 -> [Module] -- Ignore dependencies on these; treat them as
1201 -- if they were package modules
1203 downsweep hsc_env old_summaries excl_mods
1204 = do rootSummaries <- mapM getRootSummary roots
1205 checkDuplicates rootSummaries
1206 loop (concatMap msDeps rootSummaries)
1207 (mkNodeMap rootSummaries)
1209 roots = hsc_targets hsc_env
1211 old_summary_map :: NodeMap ModSummary
1212 old_summary_map = mkNodeMap old_summaries
1214 getRootSummary :: Target -> IO ModSummary
1215 getRootSummary (Target (TargetFile file) maybe_buf)
1216 = do exists <- doesFileExist file
1218 then summariseFile hsc_env old_summaries file maybe_buf
1220 throwDyn (CmdLineError ("can't find file: " ++ file))
1221 getRootSummary (Target (TargetModule modl) maybe_buf)
1222 = do maybe_summary <- summariseModule hsc_env old_summary_map Nothing False
1223 modl maybe_buf excl_mods
1224 case maybe_summary of
1225 Nothing -> packageModErr modl
1228 -- In a root module, the filename is allowed to diverge from the module
1229 -- name, so we have to check that there aren't multiple root files
1230 -- defining the same module (otherwise the duplicates will be silently
1231 -- ignored, leading to confusing behaviour).
1232 checkDuplicates :: [ModSummary] -> IO ()
1233 checkDuplicates summaries = mapM_ check summaries
1238 many -> multiRootsErr modl many
1239 where modl = ms_mod summ
1241 [ expectJust "checkDup" (ml_hs_file (ms_location summ'))
1242 | summ' <- summaries, ms_mod summ' == modl ]
1244 loop :: [(FilePath,Module,IsBootInterface)]
1245 -- Work list: process these modules
1246 -> NodeMap ModSummary
1249 -- The result includes the worklist, except
1250 -- for those mentioned in the visited set
1251 loop [] done = return (nodeMapElts done)
1252 loop ((cur_path, wanted_mod, is_boot) : ss) done
1253 | key `elemFM` done = loop ss done
1254 | otherwise = do { mb_s <- summariseModule hsc_env old_summary_map
1255 (Just cur_path) is_boot
1256 wanted_mod Nothing excl_mods
1258 Nothing -> loop ss done
1259 Just s -> loop (msDeps s ++ ss)
1260 (addToFM done key s) }
1262 key = (wanted_mod, if is_boot then HsBootFile else HsSrcFile)
1264 msDeps :: ModSummary -> [(FilePath, -- Importing module
1265 Module, -- Imported module
1266 IsBootInterface)] -- {-# SOURCE #-} import or not
1267 -- (msDeps s) returns the dependencies of the ModSummary s.
1268 -- A wrinkle is that for a {-# SOURCE #-} import we return
1269 -- *both* the hs-boot file
1270 -- *and* the source file
1271 -- as "dependencies". That ensures that the list of all relevant
1272 -- modules always contains B.hs if it contains B.hs-boot.
1273 -- Remember, this pass isn't doing the topological sort. It's
1274 -- just gathering the list of all relevant ModSummaries
1275 msDeps s = concat [ [(f, m, True), (f,m,False)] | m <- ms_srcimps s]
1276 ++ [(f,m,False) | m <- ms_imps s]
1278 f = msHsFilePath s -- Keep the importing module for error reporting
1281 -----------------------------------------------------------------------------
1282 -- Summarising modules
1284 -- We have two types of summarisation:
1286 -- * Summarise a file. This is used for the root module(s) passed to
1287 -- cmLoadModules. The file is read, and used to determine the root
1288 -- module name. The module name may differ from the filename.
1290 -- * Summarise a module. We are given a module name, and must provide
1291 -- a summary. The finder is used to locate the file in which the module
1296 -> [ModSummary] -- old summaries
1297 -> FilePath -- source file name
1298 -> Maybe (StringBuffer,ClockTime)
1301 summariseFile hsc_env old_summaries file maybe_buf
1302 -- we can use a cached summary if one is available and the
1303 -- source file hasn't changed, But we have to look up the summary
1304 -- by source file, rather than module name as we do in summarise.
1305 | Just old_summary <- findSummaryBySourceFile old_summaries file
1307 let location = ms_location old_summary
1309 -- return the cached summary if the source didn't change
1310 src_timestamp <- case maybe_buf of
1311 Just (_,t) -> return t
1312 Nothing -> getModificationTime file
1314 if ms_hs_date old_summary == src_timestamp
1315 then do -- update the object-file timestamp
1316 obj_timestamp <- getObjTimestamp location False
1317 return old_summary{ ms_obj_date = obj_timestamp }
1325 let dflags = hsc_dflags hsc_env
1327 (dflags', hspp_fn, buf)
1328 <- preprocessFile dflags file maybe_buf
1330 (srcimps,the_imps,mod) <- getImports dflags' buf hspp_fn
1332 -- Make a ModLocation for this file
1333 location <- mkHomeModLocation dflags mod file
1335 -- Tell the Finder cache where it is, so that subsequent calls
1336 -- to findModule will find it, even if it's not on any search path
1337 addHomeModuleToFinder hsc_env mod location
1339 src_timestamp <- case maybe_buf of
1340 Just (_,t) -> return t
1341 Nothing -> getModificationTime file
1343 obj_timestamp <- modificationTimeIfExists (ml_obj_file location)
1345 return (ModSummary { ms_mod = mod, ms_hsc_src = HsSrcFile,
1346 ms_location = location,
1347 ms_hspp_file = Just hspp_fn,
1348 ms_hspp_buf = Just buf,
1349 ms_srcimps = srcimps, ms_imps = the_imps,
1350 ms_hs_date = src_timestamp,
1351 ms_obj_date = obj_timestamp })
1353 findSummaryBySourceFile :: [ModSummary] -> FilePath -> Maybe ModSummary
1354 findSummaryBySourceFile summaries file
1355 = case [ ms | ms <- summaries, HsSrcFile <- [ms_hsc_src ms],
1356 fromJust (ml_hs_file (ms_location ms)) == file ] of
1360 -- Summarise a module, and pick up source and timestamp.
1363 -> NodeMap ModSummary -- Map of old summaries
1364 -> Maybe FilePath -- Importing module (for error messages)
1365 -> IsBootInterface -- True <=> a {-# SOURCE #-} import
1366 -> Module -- Imported module to be summarised
1367 -> Maybe (StringBuffer, ClockTime)
1368 -> [Module] -- Modules to exclude
1369 -> IO (Maybe ModSummary) -- Its new summary
1371 summariseModule hsc_env old_summary_map cur_mod is_boot wanted_mod maybe_buf excl_mods
1372 | wanted_mod `elem` excl_mods
1375 | Just old_summary <- lookupFM old_summary_map (wanted_mod, hsc_src)
1376 = do -- Find its new timestamp; all the
1377 -- ModSummaries in the old map have valid ml_hs_files
1378 let location = ms_location old_summary
1379 src_fn = expectJust "summariseModule" (ml_hs_file location)
1381 -- return the cached summary if the source didn't change
1382 src_timestamp <- case maybe_buf of
1383 Just (_,t) -> return t
1384 Nothing -> getModificationTime src_fn
1386 if ms_hs_date old_summary == src_timestamp
1387 then do -- update the object-file timestamp
1388 obj_timestamp <- getObjTimestamp location is_boot
1389 return (Just old_summary{ ms_obj_date = obj_timestamp })
1391 -- source changed: re-summarise
1392 new_summary location src_fn maybe_buf src_timestamp
1395 = do found <- findModule hsc_env wanted_mod True {-explicit-}
1398 | not (isHomePackage pkg) -> return Nothing
1399 -- Drop external-pkg
1400 | isJust (ml_hs_file location) -> just_found location
1402 err -> noModError dflags cur_mod wanted_mod err
1405 dflags = hsc_dflags hsc_env
1407 hsc_src = if is_boot then HsBootFile else HsSrcFile
1409 just_found location = do
1410 -- Adjust location to point to the hs-boot source file,
1411 -- hi file, object file, when is_boot says so
1412 let location' | is_boot = addBootSuffixLocn location
1413 | otherwise = location
1414 src_fn = expectJust "summarise2" (ml_hs_file location')
1416 -- Check that it exists
1417 -- It might have been deleted since the Finder last found it
1418 maybe_t <- modificationTimeIfExists src_fn
1420 Nothing -> noHsFileErr cur_mod src_fn
1421 Just t -> new_summary location' src_fn Nothing t
1424 new_summary location src_fn maybe_bug src_timestamp
1426 -- Preprocess the source file and get its imports
1427 -- The dflags' contains the OPTIONS pragmas
1428 (dflags', hspp_fn, buf) <- preprocessFile dflags src_fn maybe_buf
1429 (srcimps, the_imps, mod_name) <- getImports dflags' buf hspp_fn
1431 when (mod_name /= wanted_mod) $
1432 throwDyn (ProgramError
1433 (showSDoc (text src_fn
1434 <> text ": file name does not match module name"
1435 <+> quotes (ppr mod_name))))
1437 -- Find the object timestamp, and return the summary
1438 obj_timestamp <- getObjTimestamp location is_boot
1440 return (Just ( ModSummary { ms_mod = wanted_mod,
1441 ms_hsc_src = hsc_src,
1442 ms_location = location,
1443 ms_hspp_file = Just hspp_fn,
1444 ms_hspp_buf = Just buf,
1445 ms_srcimps = srcimps,
1447 ms_hs_date = src_timestamp,
1448 ms_obj_date = obj_timestamp }))
1451 getObjTimestamp location is_boot
1452 = if is_boot then return Nothing
1453 else modificationTimeIfExists (ml_obj_file location)
1456 preprocessFile :: DynFlags -> FilePath -> Maybe (StringBuffer,ClockTime)
1457 -> IO (DynFlags, FilePath, StringBuffer)
1458 preprocessFile dflags src_fn Nothing
1460 (dflags', hspp_fn) <- preprocess dflags src_fn
1461 buf <- hGetStringBuffer hspp_fn
1462 return (dflags', hspp_fn, buf)
1464 preprocessFile dflags src_fn (Just (buf, time))
1466 -- case we bypass the preprocessing stage?
1468 local_opts = getOptionsFromStringBuffer buf
1470 (dflags', errs) <- parseDynamicFlags dflags (map snd local_opts)
1474 | Unlit _ <- startPhase src_fn = True
1475 -- note: local_opts is only required if there's no Unlit phase
1476 | dopt Opt_Cpp dflags' = True
1477 | dopt Opt_Pp dflags' = True
1480 when needs_preprocessing $
1481 ghcError (ProgramError "buffer needs preprocesing; interactive check disabled")
1483 return (dflags', src_fn, buf)
1486 -----------------------------------------------------------------------------
1488 -----------------------------------------------------------------------------
1490 noModError :: DynFlags -> Maybe FilePath -> Module -> FindResult -> IO ab
1491 -- ToDo: we don't have a proper line number for this error
1492 noModError dflags cur_mod wanted_mod err
1493 = throwDyn $ ProgramError $ showSDoc $
1494 vcat [cantFindError dflags wanted_mod err,
1495 nest 2 (parens (pp_where cur_mod))]
1497 noHsFileErr cur_mod path
1498 = throwDyn $ CmdLineError $ showSDoc $
1499 vcat [text "Can't find" <+> text path,
1500 nest 2 (parens (pp_where cur_mod))]
1502 pp_where Nothing = text "one of the roots of the dependency analysis"
1503 pp_where (Just p) = text "imported from" <+> text p
1506 = throwDyn (CmdLineError (showSDoc (text "module" <+>
1507 quotes (ppr mod) <+>
1508 text "is a package module")))
1510 multiRootsErr mod files
1511 = throwDyn (ProgramError (showSDoc (
1512 text "module" <+> quotes (ppr mod) <+>
1513 text "is defined in multiple files:" <+>
1514 sep (map text files))))
1516 cyclicModuleErr :: [ModSummary] -> SDoc
1518 = hang (ptext SLIT("Module imports form a cycle for modules:"))
1519 2 (vcat (map show_one ms))
1521 show_one ms = sep [ show_mod (ms_hsc_src ms) (ms_mod ms),
1522 nest 2 $ ptext SLIT("imports:") <+>
1523 (pp_imps HsBootFile (ms_srcimps ms)
1524 $$ pp_imps HsSrcFile (ms_imps ms))]
1525 show_mod hsc_src mod = ppr mod <> text (hscSourceString hsc_src)
1526 pp_imps src mods = fsep (map (show_mod src) mods)
1529 -- | Inform GHC that the working directory has changed. GHC will flush
1530 -- its cache of module locations, since it may no longer be valid.
1531 -- Note: if you change the working directory, you should also unload
1532 -- the current program (set targets to empty, followed by load).
1533 workingDirectoryChanged :: Session -> IO ()
1534 workingDirectoryChanged s = withSession s $ \hsc_env ->
1535 flushFinderCache (hsc_FC hsc_env)
1537 -- -----------------------------------------------------------------------------
1538 -- inspecting the session
1540 -- | Get the module dependency graph.
1541 getModuleGraph :: Session -> IO ModuleGraph -- ToDo: DiGraph ModSummary
1542 getModuleGraph s = withSession s (return . hsc_mod_graph)
1544 isLoaded :: Session -> Module -> IO Bool
1545 isLoaded s m = withSession s $ \hsc_env ->
1546 return $! isJust (lookupModuleEnv (hsc_HPT hsc_env) m)
1548 getBindings :: Session -> IO [TyThing]
1549 getBindings s = withSession s (return . nameEnvElts . ic_type_env . hsc_IC)
1551 getPrintUnqual :: Session -> IO PrintUnqualified
1552 getPrintUnqual s = withSession s (return . icPrintUnqual . hsc_IC)
1554 -- | Container for information about a 'Module'.
1555 data ModuleInfo = ModuleInfo {
1556 minf_type_env :: TypeEnv,
1557 minf_exports :: NameSet,
1558 minf_rdr_env :: Maybe GlobalRdrEnv
1560 -- ToDo: this should really contain the ModIface too
1561 -- We don't want HomeModInfo here, because a ModuleInfo applies
1562 -- to package modules too.
1564 -- | Request information about a loaded 'Module'
1565 getModuleInfo :: Session -> Module -> IO (Maybe ModuleInfo)
1566 getModuleInfo s mdl = withSession s $ \hsc_env -> do
1567 case lookupModuleEnv (hsc_HPT hsc_env) mdl of
1570 mb_names <- getModuleExports hsc_env mdl
1572 Nothing -> return Nothing
1574 eps <- readIORef (hsc_EPS hsc_env)
1577 n_list = nameSetToList names
1578 tys = [ ty | name <- n_list,
1579 Just ty <- [lookupTypeEnv pte name] ]
1581 return (Just (ModuleInfo {
1582 minf_type_env = mkTypeEnv tys,
1583 minf_exports = names,
1584 minf_rdr_env = Just $! nameSetToGlobalRdrEnv names mdl
1587 -- bogusly different for non-GHCI (ToDo)
1591 let details = hm_details hmi in
1592 return (Just (ModuleInfo {
1593 minf_type_env = md_types details,
1594 minf_exports = md_exports details,
1595 minf_rdr_env = mi_globals $! hm_iface hmi
1598 -- ToDo: we should be able to call getModuleInfo on a package module,
1599 -- even one that isn't loaded yet.
1601 -- | The list of top-level entities defined in a module
1602 modInfoTyThings :: ModuleInfo -> [TyThing]
1603 modInfoTyThings minf = typeEnvElts (minf_type_env minf)
1605 modInfoTopLevelScope :: ModuleInfo -> Maybe [Name]
1606 modInfoTopLevelScope minf
1607 = fmap (map gre_name . globalRdrEnvElts) (minf_rdr_env minf)
1609 modInfoExports :: ModuleInfo -> [Name]
1610 modInfoExports minf = nameSetToList $! minf_exports minf
1612 modInfoIsExportedName :: ModuleInfo -> Name -> Bool
1613 modInfoIsExportedName minf name = elemNameSet name (minf_exports minf)
1615 modInfoPrintUnqualified :: ModuleInfo -> Maybe PrintUnqualified
1616 modInfoPrintUnqualified minf = fmap unQualInScope (minf_rdr_env minf)
1618 modInfoLookupName :: Session -> ModuleInfo -> Name -> IO (Maybe TyThing)
1619 modInfoLookupName s minf name = withSession s $ \hsc_env -> do
1620 case lookupTypeEnv (minf_type_env minf) name of
1621 Just tyThing -> return (Just tyThing)
1623 eps <- readIORef (hsc_EPS hsc_env)
1624 return $! lookupType (hsc_HPT hsc_env) (eps_PTE eps) name
1626 isDictonaryId :: Id -> Bool
1628 = case tcSplitSigmaTy (idType id) of { (tvs, theta, tau) -> isDictTy tau }
1630 -- | Looks up a global name: that is, any top-level name in any
1631 -- visible module. Unlike 'lookupName', lookupGlobalName does not use
1632 -- the interactive context, and therefore does not require a preceding
1634 lookupGlobalName :: Session -> Name -> IO (Maybe TyThing)
1635 lookupGlobalName s name = withSession s $ \hsc_env -> do
1636 eps <- readIORef (hsc_EPS hsc_env)
1637 return $! lookupType (hsc_HPT hsc_env) (eps_PTE eps) name
1643 | BinaryCode FilePath
1645 -- ToDo: typechecks abstract syntax or renamed abstract syntax. Issues:
1646 -- - typechecked syntax includes extra dictionary translation and
1647 -- AbsBinds which need to be translated back into something closer to
1648 -- the original source.
1651 -- - Data and Typeable instances for HsSyn.
1654 -- - things that aren't in the output of the renamer:
1655 -- - the export list
1659 -- - things that aren't in the output of the typechecker right now:
1660 -- - the export list
1662 -- - type signatures
1663 -- - type/data/newtype declarations
1664 -- - class declarations
1666 -- - extra things in the typechecker's output:
1667 -- - default methods are turned into top-level decls.
1668 -- - dictionary bindings
1670 -- ToDo: check for small transformations that happen to the syntax in
1671 -- the typechecker (eg. -e ==> negate e, perhaps for fromIntegral)
1673 -- ToDo: maybe use TH syntax instead of IfaceSyn? There's already a way
1674 -- to get from TyCons, Ids etc. to TH syntax (reify).
1676 -- :browse will use either lm_toplev or inspect lm_interface, depending
1677 -- on whether the module is interpreted or not.
1679 -- This is for reconstructing refactored source code
1680 -- Calls the lexer repeatedly.
1681 -- ToDo: add comment tokens to token stream
1682 getTokenStream :: Session -> Module -> IO [Located Token]
1685 -- -----------------------------------------------------------------------------
1686 -- Interactive evaluation
1690 -- | Set the interactive evaluation context.
1692 -- Setting the context doesn't throw away any bindings; the bindings
1693 -- we've built up in the InteractiveContext simply move to the new
1694 -- module. They always shadow anything in scope in the current context.
1695 setContext :: Session
1696 -> [Module] -- entire top level scope of these modules
1697 -> [Module] -- exports only of these modules
1699 setContext (Session ref) toplevs exports = do
1700 hsc_env <- readIORef ref
1701 let old_ic = hsc_IC hsc_env
1702 hpt = hsc_HPT hsc_env
1704 mapM_ (checkModuleExists hsc_env hpt) exports
1705 export_env <- mkExportEnv hsc_env exports
1706 toplev_envs <- mapM (mkTopLevEnv hpt) toplevs
1707 let all_env = foldr plusGlobalRdrEnv export_env toplev_envs
1708 writeIORef ref hsc_env{ hsc_IC = old_ic { ic_toplev_scope = toplevs,
1709 ic_exports = exports,
1710 ic_rn_gbl_env = all_env } }
1712 -- Make a GlobalRdrEnv based on the exports of the modules only.
1713 mkExportEnv :: HscEnv -> [Module] -> IO GlobalRdrEnv
1714 mkExportEnv hsc_env mods = do
1715 mb_name_sets <- mapM (getModuleExports hsc_env) mods
1717 gres = [ nameSetToGlobalRdrEnv name_set mod
1718 | (Just name_set, mod) <- zip mb_name_sets mods ]
1720 return $! foldr plusGlobalRdrEnv emptyGlobalRdrEnv gres
1722 nameSetToGlobalRdrEnv :: NameSet -> Module -> GlobalRdrEnv
1723 nameSetToGlobalRdrEnv names mod =
1724 mkGlobalRdrEnv [ GRE { gre_name = name, gre_prov = vanillaProv mod }
1725 | name <- nameSetToList names ]
1727 vanillaProv :: Module -> Provenance
1728 -- We're building a GlobalRdrEnv as if the user imported
1729 -- all the specified modules into the global interactive module
1730 vanillaProv mod = Imported [ImportSpec { is_mod = mod, is_as = mod,
1731 is_qual = False, is_explicit = False,
1732 is_loc = srcLocSpan interactiveSrcLoc }]
1734 checkModuleExists :: HscEnv -> HomePackageTable -> Module -> IO ()
1735 checkModuleExists hsc_env hpt mod =
1736 case lookupModuleEnv hpt mod of
1737 Just mod_info -> return ()
1738 _not_a_home_module -> do
1739 res <- findPackageModule hsc_env mod True
1741 Found _ _ -> return ()
1742 err -> let msg = cantFindError (hsc_dflags hsc_env) mod err in
1743 throwDyn (CmdLineError (showSDoc msg))
1745 mkTopLevEnv :: HomePackageTable -> Module -> IO GlobalRdrEnv
1746 mkTopLevEnv hpt modl
1747 = case lookupModuleEnv hpt modl of
1749 throwDyn (ProgramError ("mkTopLevEnv: not a home module "
1750 ++ showSDoc (pprModule modl)))
1752 case mi_globals (hm_iface details) of
1754 throwDyn (ProgramError ("mkTopLevEnv: not interpreted "
1755 ++ showSDoc (pprModule modl)))
1756 Just env -> return env
1758 -- | Get the interactive evaluation context, consisting of a pair of the
1759 -- set of modules from which we take the full top-level scope, and the set
1760 -- of modules from which we take just the exports respectively.
1761 getContext :: Session -> IO ([Module],[Module])
1762 getContext s = withSession s (\HscEnv{ hsc_IC=ic } ->
1763 return (ic_toplev_scope ic, ic_exports ic))
1765 -- | Returns 'True' if the specified module is interpreted, and hence has
1766 -- its full top-level scope available.
1767 moduleIsInterpreted :: Session -> Module -> IO Bool
1768 moduleIsInterpreted s modl = withSession s $ \h ->
1769 case lookupModuleEnv (hsc_HPT h) modl of
1770 Just details -> return (isJust (mi_globals (hm_iface details)))
1771 _not_a_home_module -> return False
1773 -- | Looks up an identifier in the current interactive context (for :info)
1774 {-# DEPRECATED getInfo "we should be using parseName/lookupName instead" #-}
1775 getInfo :: Session -> String -> IO [GetInfoResult]
1776 getInfo s id = withSession s $ \hsc_env -> hscGetInfo hsc_env id
1778 -- | Returns all names in scope in the current interactive context
1779 getNamesInScope :: Session -> IO [Name]
1780 getNamesInScope s = withSession s $ \hsc_env -> do
1781 return (map gre_name (globalRdrEnvElts (ic_rn_gbl_env (hsc_IC hsc_env))))
1783 -- | Parses a string as an identifier, and returns the list of 'Name's that
1784 -- the identifier can refer to in the current interactive context.
1785 parseName :: Session -> String -> IO [Name]
1786 parseName s str = withSession s $ \hsc_env -> do
1787 maybe_rdr_name <- hscParseIdentifier (hsc_dflags hsc_env) str
1788 case maybe_rdr_name of
1789 Nothing -> return []
1790 Just (L _ rdr_name) -> do
1791 mb_names <- tcRnLookupRdrName hsc_env rdr_name
1793 Nothing -> return []
1794 Just ns -> return ns
1795 -- ToDo: should return error messages
1797 -- | Returns the 'TyThing' for a 'Name'. The 'Name' may refer to any
1798 -- entity known to GHC, including 'Name's defined using 'runStmt'.
1799 lookupName :: Session -> Name -> IO (Maybe TyThing)
1800 lookupName s name = withSession s $ \hsc_env -> do
1801 case lookupTypeEnv (ic_type_env (hsc_IC hsc_env)) name of
1802 Just tt -> return (Just tt)
1804 eps <- readIORef (hsc_EPS hsc_env)
1805 return $! lookupType (hsc_HPT hsc_env) (eps_PTE eps) name
1807 -- -----------------------------------------------------------------------------
1808 -- Getting the type of an expression
1810 -- | Get the type of an expression
1811 exprType :: Session -> String -> IO (Maybe Type)
1812 exprType s expr = withSession s $ \hsc_env -> do
1813 maybe_stuff <- hscTcExpr hsc_env expr
1815 Nothing -> return Nothing
1816 Just ty -> return (Just tidy_ty)
1818 tidy_ty = tidyType emptyTidyEnv ty
1819 dflags = hsc_dflags hsc_env
1821 -- -----------------------------------------------------------------------------
1822 -- Getting the kind of a type
1824 -- | Get the kind of a type
1825 typeKind :: Session -> String -> IO (Maybe Kind)
1826 typeKind s str = withSession s $ \hsc_env -> do
1827 maybe_stuff <- hscKcType hsc_env str
1829 Nothing -> return Nothing
1830 Just kind -> return (Just kind)
1832 -----------------------------------------------------------------------------
1833 -- cmCompileExpr: compile an expression and deliver an HValue
1835 compileExpr :: Session -> String -> IO (Maybe HValue)
1836 compileExpr s expr = withSession s $ \hsc_env -> do
1837 maybe_stuff <- hscStmt hsc_env ("let __cmCompileExpr = "++expr)
1839 Nothing -> return Nothing
1840 Just (new_ic, names, hval) -> do
1842 hvals <- (unsafeCoerce# hval) :: IO [HValue]
1844 case (names,hvals) of
1845 ([n],[hv]) -> return (Just hv)
1846 _ -> panic "compileExpr"
1848 -- -----------------------------------------------------------------------------
1849 -- running a statement interactively
1852 = RunOk [Name] -- ^ names bound by this evaluation
1853 | RunFailed -- ^ statement failed compilation
1854 | RunException Exception -- ^ statement raised an exception
1856 -- | Run a statement in the current interactive context. Statemenet
1857 -- may bind multple values.
1858 runStmt :: Session -> String -> IO RunResult
1859 runStmt (Session ref) expr
1861 hsc_env <- readIORef ref
1863 -- Turn off -fwarn-unused-bindings when running a statement, to hide
1864 -- warnings about the implicit bindings we introduce.
1865 let dflags' = dopt_unset (hsc_dflags hsc_env) Opt_WarnUnusedBinds
1866 hsc_env' = hsc_env{ hsc_dflags = dflags' }
1868 maybe_stuff <- hscStmt hsc_env' expr
1871 Nothing -> return RunFailed
1872 Just (new_hsc_env, names, hval) -> do
1874 let thing_to_run = unsafeCoerce# hval :: IO [HValue]
1875 either_hvals <- sandboxIO thing_to_run
1877 case either_hvals of
1879 -- on error, keep the *old* interactive context,
1880 -- so that 'it' is not bound to something
1881 -- that doesn't exist.
1882 return (RunException e)
1885 -- Get the newly bound things, and bind them.
1886 -- Don't need to delete any shadowed bindings;
1887 -- the new ones override the old ones.
1888 extendLinkEnv (zip names hvals)
1890 writeIORef ref new_hsc_env
1891 return (RunOk names)
1894 -- We run the statement in a "sandbox" to protect the rest of the
1895 -- system from anything the expression might do. For now, this
1896 -- consists of just wrapping it in an exception handler, but see below
1897 -- for another version.
1899 sandboxIO :: IO a -> IO (Either Exception a)
1900 sandboxIO thing = Exception.try thing
1903 -- This version of sandboxIO runs the expression in a completely new
1904 -- RTS main thread. It is disabled for now because ^C exceptions
1905 -- won't be delivered to the new thread, instead they'll be delivered
1906 -- to the (blocked) GHCi main thread.
1908 -- SLPJ: when re-enabling this, reflect a wrong-stat error as an exception
1910 sandboxIO :: IO a -> IO (Either Int (Either Exception a))
1911 sandboxIO thing = do
1912 st_thing <- newStablePtr (Exception.try thing)
1913 alloca $ \ p_st_result -> do
1914 stat <- rts_evalStableIO st_thing p_st_result
1915 freeStablePtr st_thing
1917 then do st_result <- peek p_st_result
1918 result <- deRefStablePtr st_result
1919 freeStablePtr st_result
1920 return (Right result)
1922 return (Left (fromIntegral stat))
1924 foreign import "rts_evalStableIO" {- safe -}
1925 rts_evalStableIO :: StablePtr (IO a) -> Ptr (StablePtr a) -> IO CInt
1926 -- more informative than the C type!
1929 -- ---------------------------------------------------------------------------
1930 -- cmBrowseModule: get all the TyThings defined in a module
1932 {-# DEPRECATED browseModule "we should be using getModuleInfo instead" #-}
1933 browseModule :: Session -> Module -> Bool -> IO [IfaceDecl]
1934 browseModule s modl exports_only = withSession s $ \hsc_env -> do
1935 mb_decls <- getModuleContents hsc_env modl exports_only
1937 Nothing -> return [] -- An error of some kind
1938 Just ds -> return ds
1941 -----------------------------------------------------------------------------
1942 -- show a module and it's source/object filenames
1944 showModule :: Session -> ModSummary -> IO String
1945 showModule s mod_summary = withSession s $ \hsc_env -> do
1946 case lookupModuleEnv (hsc_HPT hsc_env) (ms_mod mod_summary) of
1947 Nothing -> panic "missing linkable"
1948 Just mod_info -> return (showModMsg obj_linkable mod_summary)
1950 obj_linkable = isObjectLinkable (fromJust (hm_linkable mod_info))