1 -- -----------------------------------------------------------------------------
3 -- (c) The University of Glasgow, 2005
7 -- -----------------------------------------------------------------------------
13 defaultCleanupHandler,
17 -- * Flags and settings
18 DynFlags(..), DynFlag(..), GhcMode(..), HscTarget(..), dopt,
25 Target(..), TargetId(..),
32 -- * Loading\/compiling the program
34 load, LoadHowMuch(..), SuccessFlag(..), -- also does depanal
35 workingDirectoryChanged,
36 checkModule, CheckedModule(..),
38 -- * Inspecting the module structure of the program
39 ModuleGraph, ModSummary(..),
44 -- * Interactive evaluation
45 getBindings, getPrintUnqual,
47 setContext, getContext,
49 getInfo, GetInfoResult,
60 -- * Abstract syntax elements
61 Module, mkModule, pprModule,
64 Name, Id, TyCon, Class, DataCon,
68 -- used by DriverMkDepend:
76 * return error messages rather than printing them.
77 * inline bits of HscMain here to simplify layering: hscGetInfo,
79 * implement second argument to load.
80 * we need to expose DynFlags, so should parseDynamicFlags really be
81 part of this interface?
82 * what StaticFlags should we expose, if any?
85 #include "HsVersions.h"
88 import qualified Linker
89 import Linker ( HValue, extendLinkEnv )
90 import NameEnv ( lookupNameEnv )
91 import TcRnDriver ( mkExportEnv, getModuleContents )
92 import RdrName ( GlobalRdrEnv, plusGlobalRdrEnv )
93 import HscMain ( hscGetInfo, GetInfoResult,
94 hscStmt, hscTcExpr, hscKcType )
95 import Type ( tidyType )
96 import VarEnv ( emptyTidyEnv )
97 import GHC.Exts ( unsafeCoerce# )
98 import IfaceSyn ( IfaceDecl )
101 import HsSyn ( HsModule, LHsBinds )
102 import Type ( Kind, Type, dropForAlls )
103 import Id ( Id, idType )
104 import TyCon ( TyCon )
105 import Class ( Class )
106 import DataCon ( DataCon )
108 import RdrName ( RdrName )
109 import NameEnv ( nameEnvElts )
110 import SrcLoc ( Located )
111 import DriverPipeline
112 import DriverPhases ( Phase(..), isHaskellSrcFilename, startPhase )
113 import GetImports ( getImports )
114 import Packages ( isHomePackage )
116 import HscMain ( newHscEnv, hscFileCheck, HscResult(..) )
120 import SysTools ( initSysTools, cleanTempFiles )
125 import ErrUtils ( showPass, Messages, putMsg )
126 import qualified ErrUtils
128 import StringBuffer ( StringBuffer, hGetStringBuffer )
130 import SysTools ( cleanTempFilesExcept )
131 import BasicTypes ( SuccessFlag(..), succeeded, failed )
132 import Maybes ( orElse, expectJust, mapCatMaybes )
134 import Directory ( getModificationTime, doesFileExist )
135 import Maybe ( isJust, isNothing, fromJust )
136 import Maybes ( expectJust )
137 import List ( partition, nub )
138 import qualified List
139 import Monad ( unless, when, foldM )
140 import System ( exitWith, ExitCode(..) )
141 import Time ( ClockTime )
142 import EXCEPTION as Exception hiding (handle)
145 import Prelude hiding (init)
147 -- -----------------------------------------------------------------------------
148 -- Exception handlers
150 -- | Install some default exception handlers and run the inner computation.
151 -- Unless you want to handle exceptions yourself, you should wrap this around
152 -- the top level of your program. The default handlers output the error
153 -- message(s) to stderr and exit cleanly.
154 defaultErrorHandler :: IO a -> IO a
155 defaultErrorHandler inner =
156 -- top-level exception handler: any unrecognised exception is a compiler bug.
157 handle (\exception -> do
160 -- an IO exception probably isn't our fault, so don't panic
161 IOException _ -> hPutStrLn stderr (show exception)
162 AsyncException StackOverflow ->
163 hPutStrLn stderr "stack overflow: use +RTS -K<size> to increase it"
164 _other -> hPutStr stderr (show (Panic (show exception)))
165 exitWith (ExitFailure 1)
168 -- all error messages are propagated as exceptions
169 handleDyn (\dyn -> do
172 PhaseFailed _ code -> exitWith code
173 Interrupted -> exitWith (ExitFailure 1)
174 _ -> do hPutStrLn stderr (show (dyn :: GhcException))
175 exitWith (ExitFailure 1)
179 -- | Install a default cleanup handler to remove temporary files
180 -- deposited by a GHC run. This is seperate from
181 -- 'defaultErrorHandler', because you might want to override the error
182 -- handling, but still get the ordinary cleanup behaviour.
183 defaultCleanupHandler :: DynFlags -> IO a -> IO a
184 defaultCleanupHandler dflags inner =
185 -- make sure we clean up after ourselves
186 later (unless (dopt Opt_KeepTmpFiles dflags) $
187 cleanTempFiles dflags)
188 -- exceptions will be blocked while we clean the temporary files,
189 -- so there shouldn't be any difficulty if we receive further
194 -- | Initialises GHC. This must be done /once/ only. Takes the
195 -- command-line arguments. All command-line arguments which aren't
196 -- understood by GHC will be returned.
198 init :: [String] -> IO [String]
201 installSignalHandlers
203 -- Grab the -B option if there is one
204 let (minusB_args, argv1) = partition (prefixMatch "-B") args
205 dflags0 <- initSysTools minusB_args defaultDynFlags
206 writeIORef v_initDynFlags dflags0
208 -- Parse the static flags
209 argv2 <- parseStaticFlags argv1
212 GLOBAL_VAR(v_initDynFlags, error "initDynFlags", DynFlags)
213 -- stores the DynFlags between the call to init and subsequent
214 -- calls to newSession.
216 -- | Starts a new session. A session consists of a set of loaded
217 -- modules, a set of options (DynFlags), and an interactive context.
218 -- ToDo: GhcMode should say "keep typechecked code" and\/or "keep renamed
220 newSession :: GhcMode -> IO Session
222 dflags0 <- readIORef v_initDynFlags
223 dflags <- initDynFlags dflags0
224 env <- newHscEnv dflags{ ghcMode=mode }
228 -- tmp: this breaks the abstraction, but required because DriverMkDepend
229 -- needs to call the Finder. ToDo: untangle this.
230 sessionHscEnv :: Session -> IO HscEnv
231 sessionHscEnv (Session ref) = readIORef ref
233 withSession :: Session -> (HscEnv -> IO a) -> IO a
234 withSession (Session ref) f = do h <- readIORef ref; f h
236 modifySession :: Session -> (HscEnv -> HscEnv) -> IO ()
237 modifySession (Session ref) f = do h <- readIORef ref; writeIORef ref $! f h
239 -- -----------------------------------------------------------------------------
242 -- | Grabs the DynFlags from the Session
243 getSessionDynFlags :: Session -> IO DynFlags
244 getSessionDynFlags s = withSession s (return . hsc_dflags)
246 -- | Updates the DynFlags in a Session
247 setSessionDynFlags :: Session -> DynFlags -> IO ()
248 setSessionDynFlags s dflags = modifySession s (\h -> h{ hsc_dflags = dflags })
250 -- | Messages during compilation (eg. warnings and progress messages)
251 -- are reported using this callback. By default, these messages are
252 -- printed to stderr.
253 setMsgHandler :: (String -> IO ()) -> IO ()
254 setMsgHandler = ErrUtils.setMsgHandler
256 -- -----------------------------------------------------------------------------
259 -- ToDo: think about relative vs. absolute file paths. And what
260 -- happens when the current directory changes.
262 -- | Sets the targets for this session. Each target may be a module name
263 -- or a filename. The targets correspond to the set of root modules for
264 -- the program\/library. Unloading the current program is achieved by
265 -- setting the current set of targets to be empty, followed by load.
266 setTargets :: Session -> [Target] -> IO ()
267 setTargets s targets = modifySession s (\h -> h{ hsc_targets = targets })
269 -- | returns the current set of targets
270 getTargets :: Session -> IO [Target]
271 getTargets s = withSession s (return . hsc_targets)
273 -- | Add another target
274 addTarget :: Session -> Target -> IO ()
276 = modifySession s (\h -> h{ hsc_targets = target : hsc_targets h })
279 removeTarget :: Session -> TargetId -> IO ()
280 removeTarget s target_id
281 = modifySession s (\h -> h{ hsc_targets = filter (hsc_targets h) })
283 filter targets = [ t | t@(Target id _) <- targets, id /= target_id ]
285 -- Attempts to guess what Target a string refers to. This function implements
286 -- the --make/GHCi command-line syntax for filenames:
288 -- - if the string looks like a Haskell source filename, then interpret
290 -- - if adding a .hs or .lhs suffix yields the name of an existing file,
292 -- - otherwise interpret the string as a module name
294 guessTarget :: String -> IO Target
296 | isHaskellSrcFilename file
297 = return (Target (TargetFile file) Nothing)
299 = do exists <- doesFileExist hs_file
300 if exists then return (Target (TargetFile hs_file) Nothing) else do
301 exists <- doesFileExist lhs_file
302 if exists then return (Target (TargetFile lhs_file) Nothing) else do
303 return (Target (TargetModule (mkModule file)) Nothing)
305 hs_file = file ++ ".hs"
306 lhs_file = file ++ ".lhs"
308 -- -----------------------------------------------------------------------------
309 -- Loading the program
311 -- Perform a dependency analysis starting from the current targets
312 -- and update the session with the new module graph.
313 depanal :: Session -> [Module] -> IO ()
314 depanal (Session ref) excluded_mods = do
315 hsc_env <- readIORef ref
317 dflags = hsc_dflags hsc_env
318 gmode = ghcMode (hsc_dflags hsc_env)
319 targets = hsc_targets hsc_env
320 old_graph = hsc_mod_graph hsc_env
322 showPass dflags "Chasing dependencies"
323 when (verbosity dflags >= 1 && gmode == BatchCompile) $
324 hPutStrLn stderr (showSDoc (hcat [
325 text "Chasing modules from: ",
326 hcat (punctuate comma (map pprTarget targets))]))
328 graph <- downsweep hsc_env old_graph excluded_mods
329 writeIORef ref hsc_env{ hsc_mod_graph=graph }
332 -- | The result of load.
334 = LoadOk Errors -- ^ all specified targets were loaded successfully.
335 | LoadFailed Errors -- ^ not all modules were loaded.
337 type Errors = [String]
339 data ErrMsg = ErrMsg {
340 errMsgSeverity :: Severity, -- warning, error, etc.
341 errMsgSpans :: [SrcSpan],
342 errMsgShortDoc :: Doc,
343 errMsgExtraInfo :: Doc
350 | LoadDependenciesOf Module
352 -- | Try to load the program. If a Module is supplied, then just
353 -- attempt to load up to this target. If no Module is supplied,
354 -- then try to load all targets.
355 load :: Session -> LoadHowMuch -> IO SuccessFlag
356 load s@(Session ref) how_much
358 -- Dependency analysis first. Note that this fixes the module graph:
359 -- even if we don't get a fully successful upsweep, the full module
360 -- graph is still retained in the Session. We can tell which modules
361 -- were successfully loaded by inspecting the Session's HPT.
364 hsc_env <- readIORef ref
366 let hpt1 = hsc_HPT hsc_env
367 let dflags = hsc_dflags hsc_env
368 let mod_graph = hsc_mod_graph hsc_env
370 let ghci_mode = ghcMode (hsc_dflags hsc_env) -- this never changes
371 let verb = verbosity dflags
373 -- The "bad" boot modules are the ones for which we have
374 -- B.hs-boot in the module graph, but no B.hs
375 -- The downsweep should have ensured this does not happen
377 let all_home_mods = [ms_mod s | s <- mod_graph, not (isBootSummary s)]
378 bad_boot_mods = [s | s <- mod_graph, isBootSummary s,
379 not (ms_mod s `elem` all_home_mods)]
380 ASSERT( null bad_boot_mods ) return ()
382 -- mg2_with_srcimps drops the hi-boot nodes, returning a
383 -- graph with cycles. Among other things, it is used for
384 -- backing out partially complete cycles following a failed
385 -- upsweep, and for removing from hpt all the modules
386 -- not in strict downwards closure, during calls to compile.
387 let mg2_with_srcimps :: [SCC ModSummary]
388 mg2_with_srcimps = topSortModuleGraph True mod_graph Nothing
390 -- check the stability property for each module.
391 stable_mods@(stable_obj,stable_bco)
392 | BatchCompile <- ghci_mode = ([],[])
393 | otherwise = checkStability hpt1 mg2_with_srcimps all_home_mods
395 -- prune bits of the HPT which are definitely redundant now,
397 pruned_hpt = pruneHomePackageTable hpt1
398 (flattenSCCs mg2_with_srcimps)
404 putStrLn (showSDoc (text "Stable obj:" <+> ppr stable_obj $$
405 text "Stable BCO:" <+> ppr stable_bco))
407 -- Unload any modules which are going to be re-linked this time around.
408 let stable_linkables = [ linkable
409 | m <- stable_obj++stable_bco,
410 Just hmi <- [lookupModuleEnv pruned_hpt m],
411 Just linkable <- [hm_linkable hmi] ]
412 unload hsc_env stable_linkables
414 -- We could at this point detect cycles which aren't broken by
415 -- a source-import, and complain immediately, but it seems better
416 -- to let upsweep_mods do this, so at least some useful work gets
417 -- done before the upsweep is abandoned.
418 --hPutStrLn stderr "after tsort:\n"
419 --hPutStrLn stderr (showSDoc (vcat (map ppr mg2)))
421 -- Now do the upsweep, calling compile for each module in
422 -- turn. Final result is version 3 of everything.
424 -- Topologically sort the module graph, this time including hi-boot
425 -- nodes, and possibly just including the portion of the graph
426 -- reachable from the module specified in the 2nd argument to load.
427 -- This graph should be cycle-free.
428 -- If we're restricting the upsweep to a portion of the graph, we
429 -- also want to retain everything that is still stable.
430 let full_mg :: [SCC ModSummary]
431 full_mg = topSortModuleGraph False mod_graph Nothing
433 maybe_top_mod = case how_much of
435 LoadDependenciesOf m -> Just m
438 partial_mg0 :: [SCC ModSummary]
439 partial_mg0 = topSortModuleGraph False mod_graph maybe_top_mod
441 -- LoadDependenciesOf m: we want the upsweep to stop just
442 -- short of the specified module (unless the specified module
445 | LoadDependenciesOf mod <- how_much
446 = ASSERT( case last partial_mg0 of
447 AcyclicSCC ms -> ms_mod ms == mod; _ -> False )
448 List.init partial_mg0
454 | AcyclicSCC ms <- full_mg,
455 ms_mod ms `elem` stable_obj++stable_bco,
456 ms_mod ms `notElem` [ ms_mod ms' |
457 AcyclicSCC ms' <- partial_mg ] ]
459 mg = stable_mg ++ partial_mg
461 -- clean up between compilations
462 let cleanup = cleanTempFilesExcept dflags
463 (ppFilesFromSummaries (flattenSCCs mg2_with_srcimps))
465 (upsweep_ok, hsc_env1, modsUpswept)
466 <- upsweep (hsc_env { hsc_HPT = emptyHomePackageTable })
467 pruned_hpt stable_mods cleanup mg
469 -- Make modsDone be the summaries for each home module now
470 -- available; this should equal the domain of hpt3.
471 -- Get in in a roughly top .. bottom order (hence reverse).
473 let modsDone = reverse modsUpswept
475 -- Try and do linking in some form, depending on whether the
476 -- upsweep was completely or only partially successful.
478 if succeeded upsweep_ok
481 -- Easy; just relink it all.
482 do when (verb >= 2) $ putMsg "Upsweep completely successful."
484 -- Clean up after ourselves
485 cleanTempFilesExcept dflags (ppFilesFromSummaries modsDone)
487 -- Issue a warning for the confusing case where the user
488 -- said '-o foo' but we're not going to do any linking.
489 -- We attempt linking if either (a) one of the modules is
490 -- called Main, or (b) the user said -no-hs-main, indicating
491 -- that main() is going to come from somewhere else.
493 let ofile = outputFile dflags
494 let no_hs_main = dopt Opt_NoHsMain dflags
495 let mb_main_mod = mainModIs dflags
497 main_mod = mb_main_mod `orElse` "Main"
499 = any ((==main_mod).moduleUserString.ms_mod)
501 do_linking = a_root_is_Main || no_hs_main
503 when (ghci_mode == BatchCompile && isJust ofile && not do_linking
505 putMsg ("Warning: output was redirected with -o, " ++
506 "but no output will be generated\n" ++
507 "because there is no " ++ main_mod ++ " module.")
509 -- link everything together
510 linkresult <- link ghci_mode dflags do_linking (hsc_HPT hsc_env1)
512 loadFinish Succeeded linkresult ref hsc_env1
515 -- Tricky. We need to back out the effects of compiling any
516 -- half-done cycles, both so as to clean up the top level envs
517 -- and to avoid telling the interactive linker to link them.
518 do when (verb >= 2) $ putMsg "Upsweep partially successful."
521 = map ms_mod modsDone
522 let mods_to_zap_names
523 = findPartiallyCompletedCycles modsDone_names
526 = filter ((`notElem` mods_to_zap_names).ms_mod)
529 let hpt4 = retainInTopLevelEnvs (map ms_mod mods_to_keep)
532 -- Clean up after ourselves
533 cleanTempFilesExcept dflags (ppFilesFromSummaries mods_to_keep)
535 -- there should be no Nothings where linkables should be, now
536 ASSERT(all (isJust.hm_linkable)
537 (moduleEnvElts (hsc_HPT hsc_env))) do
539 -- Link everything together
540 linkresult <- link ghci_mode dflags False hpt4
542 let hsc_env4 = hsc_env1{ hsc_HPT = hpt4 }
543 loadFinish Failed linkresult ref hsc_env4
545 -- Finish up after a load.
547 -- If the link failed, unload everything and return.
548 loadFinish all_ok Failed ref hsc_env
549 = do unload hsc_env []
550 writeIORef ref $! discardProg hsc_env
553 -- Empty the interactive context and set the module context to the topmost
554 -- newly loaded module, or the Prelude if none were loaded.
555 loadFinish all_ok Succeeded ref hsc_env
556 = do writeIORef ref $! hsc_env{ hsc_IC = emptyInteractiveContext }
560 -- Forget the current program, but retain the persistent info in HscEnv
561 discardProg :: HscEnv -> HscEnv
563 = hsc_env { hsc_mod_graph = emptyMG,
564 hsc_IC = emptyInteractiveContext,
565 hsc_HPT = emptyHomePackageTable }
567 -- used to fish out the preprocess output files for the purposes of
568 -- cleaning up. The preprocessed file *might* be the same as the
569 -- source file, but that doesn't do any harm.
570 ppFilesFromSummaries summaries = [ fn | Just fn <- map ms_hspp_file summaries ]
572 -- -----------------------------------------------------------------------------
576 CheckedModule { parsedSource :: ParsedSource,
577 typecheckedSource :: Maybe TypecheckedSource
580 type ParsedSource = Located (HsModule RdrName)
581 type TypecheckedSource = (LHsBinds Id, GlobalRdrEnv)
583 -- | This is the way to get access to parsed and typechecked source code
584 -- for a module. 'checkModule' loads all the dependencies of the specified
585 -- module in the Session, and then attempts to typecheck the module. If
586 -- successful, it returns the abstract syntax for the module.
587 checkModule :: Session -> Module -> (Messages -> IO ())
588 -> IO (Maybe CheckedModule)
589 checkModule session@(Session ref) mod msg_act = do
590 -- load up the dependencies first
591 r <- load session (LoadDependenciesOf mod)
592 if (failed r) then return Nothing else do
594 -- now parse & typecheck the module
595 hsc_env <- readIORef ref
596 let mg = hsc_mod_graph hsc_env
597 case [ ms | ms <- mg, ms_mod ms == mod ] of
600 r <- hscFileCheck hsc_env msg_act ms
604 HscChecked parsed tcd ->
605 return (Just (CheckedModule parsed tcd) )
607 -----------------------------------------------------------------------------
610 unload :: HscEnv -> [Linkable] -> IO ()
611 unload hsc_env stable_linkables -- Unload everthing *except* 'stable_linkables'
612 = case ghcMode (hsc_dflags hsc_env) of
613 BatchCompile -> return ()
614 JustTypecheck -> return ()
616 Interactive -> Linker.unload (hsc_dflags hsc_env) stable_linkables
618 Interactive -> panic "unload: no interpreter"
620 other -> panic "unload: strange mode"
622 -- -----------------------------------------------------------------------------
626 Stability tells us which modules definitely do not need to be recompiled.
627 There are two main reasons for having stability:
629 - avoid doing a complete upsweep of the module graph in GHCi when
630 modules near the bottom of the tree have not changed.
632 - to tell GHCi when it can load object code: we can only load object code
633 for a module when we also load object code fo all of the imports of the
634 module. So we need to know that we will definitely not be recompiling
635 any of these modules, and we can use the object code.
637 NB. stability is of no importance to BatchCompile at all, only Interactive.
638 (ToDo: what about JustTypecheck?)
640 The stability check is as follows. Both stableObject and
641 stableBCO are used during the upsweep phase later.
644 stable m = stableObject m || stableBCO m
647 all stableObject (imports m)
648 && old linkable does not exist, or is == on-disk .o
649 && date(on-disk .o) > date(.hs)
652 all stable (imports m)
653 && date(BCO) > date(.hs)
656 These properties embody the following ideas:
658 - if a module is stable:
659 - if it has been compiled in a previous pass (present in HPT)
660 then it does not need to be compiled or re-linked.
661 - if it has not been compiled in a previous pass,
662 then we only need to read its .hi file from disk and
663 link it to produce a ModDetails.
665 - if a modules is not stable, we will definitely be at least
666 re-linking, and possibly re-compiling it during the upsweep.
667 All non-stable modules can (and should) therefore be unlinked
670 - Note that objects are only considered stable if they only depend
671 on other objects. We can't link object code against byte code.
675 :: HomePackageTable -- HPT from last compilation
676 -> [SCC ModSummary] -- current module graph (cyclic)
677 -> [Module] -- all home modules
678 -> ([Module], -- stableObject
679 [Module]) -- stableBCO
681 checkStability hpt sccs all_home_mods = foldl checkSCC ([],[]) sccs
683 checkSCC (stable_obj, stable_bco) scc0
684 | stableObjects = (scc_mods ++ stable_obj, stable_bco)
685 | stableBCOs = (stable_obj, scc_mods ++ stable_bco)
686 | otherwise = (stable_obj, stable_bco)
688 scc = flattenSCC scc0
689 scc_mods = map ms_mod scc
690 home_module m = m `elem` all_home_mods && m `notElem` scc_mods
692 scc_allimps = nub (filter home_module (concatMap ms_allimps scc))
693 -- all imports outside the current SCC, but in the home pkg
695 stable_obj_imps = map (`elem` stable_obj) scc_allimps
696 stable_bco_imps = map (`elem` stable_bco) scc_allimps
703 and (zipWith (||) stable_obj_imps stable_bco_imps)
707 | Just t <- ms_obj_date ms = t >= ms_hs_date ms
711 same_as_prev t = case lookupModuleEnv hpt (ms_mod ms) of
713 Just hmi | Just l <- hm_linkable hmi
714 -> isObjectLinkable l && t == linkableTime l
715 -- why '>=' rather than '>' above? If the filesystem stores
716 -- times to the nearset second, we may occasionally find that
717 -- the object & source have the same modification time,
718 -- especially if the source was automatically generated
719 -- and compiled. Using >= is slightly unsafe, but it matches
723 = case lookupModuleEnv hpt (ms_mod ms) of
725 Just hmi | Just l <- hm_linkable hmi ->
726 not (isObjectLinkable l) &&
727 linkableTime l >= ms_hs_date ms
729 ms_allimps :: ModSummary -> [Module]
730 ms_allimps ms = ms_srcimps ms ++ ms_imps ms
732 -- -----------------------------------------------------------------------------
733 -- Prune the HomePackageTable
735 -- Before doing an upsweep, we can throw away:
737 -- - For non-stable modules:
738 -- - all ModDetails, all linked code
739 -- - all unlinked code that is out of date with respect to
742 -- This is VERY IMPORTANT otherwise we'll end up requiring 2x the
743 -- space at the end of the upsweep, because the topmost ModDetails of the
744 -- old HPT holds on to the entire type environment from the previous
747 pruneHomePackageTable
750 -> ([Module],[Module])
753 pruneHomePackageTable hpt summ (stable_obj, stable_bco)
754 = mapModuleEnv prune hpt
756 | is_stable modl = hmi'
757 | otherwise = hmi'{ hm_details = emptyModDetails }
759 modl = mi_module (hm_iface hmi)
760 hmi' | Just l <- hm_linkable hmi, linkableTime l < ms_hs_date ms
761 = hmi{ hm_linkable = Nothing }
764 where ms = expectJust "prune" (lookupModuleEnv ms_map modl)
766 ms_map = mkModuleEnv [(ms_mod ms, ms) | ms <- summ]
768 is_stable m = m `elem` stable_obj || m `elem` stable_bco
770 -- -----------------------------------------------------------------------------
772 -- Return (names of) all those in modsDone who are part of a cycle
773 -- as defined by theGraph.
774 findPartiallyCompletedCycles :: [Module] -> [SCC ModSummary] -> [Module]
775 findPartiallyCompletedCycles modsDone theGraph
779 chew ((AcyclicSCC v):rest) = chew rest -- acyclic? not interesting.
780 chew ((CyclicSCC vs):rest)
781 = let names_in_this_cycle = nub (map ms_mod vs)
783 = nub ([done | done <- modsDone,
784 done `elem` names_in_this_cycle])
785 chewed_rest = chew rest
787 if notNull mods_in_this_cycle
788 && length mods_in_this_cycle < length names_in_this_cycle
789 then mods_in_this_cycle ++ chewed_rest
792 -- -----------------------------------------------------------------------------
795 -- This is where we compile each module in the module graph, in a pass
796 -- from the bottom to the top of the graph.
798 -- There better had not be any cyclic groups here -- we check for them.
801 :: HscEnv -- Includes initially-empty HPT
802 -> HomePackageTable -- HPT from last time round (pruned)
803 -> ([Module],[Module]) -- stable modules (see checkStability)
804 -> IO () -- How to clean up unwanted tmp files
805 -> [SCC ModSummary] -- Mods to do (the worklist)
807 HscEnv, -- With an updated HPT
808 [ModSummary]) -- Mods which succeeded
810 upsweep hsc_env old_hpt stable_mods cleanup
812 = return (Succeeded, hsc_env, [])
814 upsweep hsc_env old_hpt stable_mods cleanup
816 = do hPutStrLn stderr (showSDoc (cyclicModuleErr ms))
817 return (Failed, hsc_env, [])
819 upsweep hsc_env old_hpt stable_mods cleanup
820 (AcyclicSCC mod:mods)
821 = do -- putStrLn ("UPSWEEP_MOD: hpt = " ++
822 -- show (map (moduleUserString.moduleName.mi_module.hm_iface)
823 -- (moduleEnvElts (hsc_HPT hsc_env)))
825 mb_mod_info <- upsweep_mod hsc_env old_hpt stable_mods mod
827 cleanup -- Remove unwanted tmp files between compilations
830 Nothing -> return (Failed, hsc_env, [])
832 { let this_mod = ms_mod mod
834 -- Add new info to hsc_env
835 hpt1 = extendModuleEnv (hsc_HPT hsc_env)
837 hsc_env1 = hsc_env { hsc_HPT = hpt1 }
839 -- Space-saving: delete the old HPT entry
840 -- for mod BUT if mod is a hs-boot
841 -- node, don't delete it. For the
842 -- interface, the HPT entry is probaby for the
843 -- main Haskell source file. Deleting it
844 -- would force .. (what?? --SDM)
845 old_hpt1 | isBootSummary mod = old_hpt
846 | otherwise = delModuleEnv old_hpt this_mod
848 ; (restOK, hsc_env2, modOKs)
849 <- upsweep hsc_env1 old_hpt1 stable_mods cleanup mods
850 ; return (restOK, hsc_env2, mod:modOKs)
854 -- Compile a single module. Always produce a Linkable for it if
855 -- successful. If no compilation happened, return the old Linkable.
856 upsweep_mod :: HscEnv
858 -> ([Module],[Module])
860 -> IO (Maybe HomeModInfo) -- Nothing => Failed
862 upsweep_mod hsc_env old_hpt (stable_obj, stable_bco) summary
865 this_mod = ms_mod summary
866 mb_obj_date = ms_obj_date summary
867 obj_fn = ml_obj_file (ms_location summary)
868 hs_date = ms_hs_date summary
870 compile_it :: Maybe Linkable -> IO (Maybe HomeModInfo)
871 compile_it = upsweep_compile hsc_env old_hpt this_mod summary
873 case ghcMode (hsc_dflags hsc_env) of
876 -- Batch-compilating is easy: just check whether we have
877 -- an up-to-date object file. If we do, then the compiler
878 -- needs to do a recompilation check.
879 _ | Just obj_date <- mb_obj_date, obj_date >= hs_date -> do
881 findObjectLinkable this_mod obj_fn obj_date
882 compile_it (Just linkable)
889 _ | is_stable_obj, isJust old_hmi ->
891 -- object is stable, and we have an entry in the
892 -- old HPT: nothing to do
894 | is_stable_obj, isNothing old_hmi -> do
896 findObjectLinkable this_mod obj_fn
897 (expectJust "upseep1" mb_obj_date)
898 compile_it (Just linkable)
899 -- object is stable, but we need to load the interface
900 -- off disk to make a HMI.
903 ASSERT(isJust old_hmi) -- must be in the old_hpt
905 -- BCO is stable: nothing to do
907 | Just hmi <- old_hmi,
908 Just l <- hm_linkable hmi, not (isObjectLinkable l),
909 linkableTime l >= ms_hs_date summary ->
911 -- we have an old BCO that is up to date with respect
912 -- to the source: do a recompilation check as normal.
916 -- no existing code at all: we must recompile.
918 is_stable_obj = this_mod `elem` stable_obj
919 is_stable_bco = this_mod `elem` stable_bco
921 old_hmi = lookupModuleEnv old_hpt this_mod
923 -- Run hsc to compile a module
924 upsweep_compile hsc_env old_hpt this_mod summary mb_old_linkable = do
926 -- The old interface is ok if it's in the old HPT
927 -- a) we're compiling a source file, and the old HPT
928 -- entry is for a source file
929 -- b) we're compiling a hs-boot file
930 -- Case (b) allows an hs-boot file to get the interface of its
931 -- real source file on the second iteration of the compilation
932 -- manager, but that does no harm. Otherwise the hs-boot file
933 -- will always be recompiled
936 = case lookupModuleEnv old_hpt this_mod of
938 Just hm_info | isBootSummary summary -> Just iface
939 | not (mi_boot iface) -> Just iface
940 | otherwise -> Nothing
942 iface = hm_iface hm_info
944 compresult <- compile hsc_env summary mb_old_linkable mb_old_iface
947 -- Compilation failed. Compile may still have updated the PCS, tho.
948 CompErrs -> return Nothing
950 -- Compilation "succeeded", and may or may not have returned a new
951 -- linkable (depending on whether compilation was actually performed
953 CompOK new_details new_iface new_linkable
954 -> do let new_info = HomeModInfo { hm_iface = new_iface,
955 hm_details = new_details,
956 hm_linkable = new_linkable }
957 return (Just new_info)
960 -- Filter modules in the HPT
961 retainInTopLevelEnvs :: [Module] -> HomePackageTable -> HomePackageTable
962 retainInTopLevelEnvs keep_these hpt
963 = mkModuleEnv [ (mod, expectJust "retain" mb_mod_info)
965 , let mb_mod_info = lookupModuleEnv hpt mod
966 , isJust mb_mod_info ]
968 -- ---------------------------------------------------------------------------
969 -- Topological sort of the module graph
972 :: Bool -- Drop hi-boot nodes? (see below)
976 -- Calculate SCCs of the module graph, possibly dropping the hi-boot nodes
978 -- Drop hi-boot nodes (first boolean arg)?
980 -- False: treat the hi-boot summaries as nodes of the graph,
981 -- so the graph must be acyclic
983 -- True: eliminate the hi-boot nodes, and instead pretend
984 -- the a source-import of Foo is an import of Foo
985 -- The resulting graph has no hi-boot nodes, but can by cyclic
987 topSortModuleGraph drop_hs_boot_nodes summaries Nothing
988 = stronglyConnComp (fst (moduleGraphNodes drop_hs_boot_nodes summaries))
989 topSortModuleGraph drop_hs_boot_nodes summaries (Just mod)
990 = stronglyConnComp (map vertex_fn (reachable graph root))
992 -- restrict the graph to just those modules reachable from
993 -- the specified module. We do this by building a graph with
994 -- the full set of nodes, and determining the reachable set from
995 -- the specified node.
996 (nodes, lookup_key) = moduleGraphNodes drop_hs_boot_nodes summaries
997 (graph, vertex_fn, key_fn) = graphFromEdges' nodes
999 | Just key <- lookup_key HsSrcFile mod, Just v <- key_fn key = v
1000 | otherwise = throwDyn (ProgramError "module does not exist")
1002 moduleGraphNodes :: Bool -> [ModSummary]
1003 -> ([(ModSummary, Int, [Int])], HscSource -> Module -> Maybe Int)
1004 moduleGraphNodes drop_hs_boot_nodes summaries = (nodes, lookup_key)
1006 -- Drop hs-boot nodes by using HsSrcFile as the key
1007 hs_boot_key | drop_hs_boot_nodes = HsSrcFile
1008 | otherwise = HsBootFile
1010 -- We use integers as the keys for the SCC algorithm
1011 nodes :: [(ModSummary, Int, [Int])]
1012 nodes = [(s, expectJust "topSort" (lookup_key (ms_hsc_src s) (ms_mod s)),
1013 out_edge_keys hs_boot_key (ms_srcimps s) ++
1014 out_edge_keys HsSrcFile (ms_imps s) )
1016 , not (isBootSummary s && drop_hs_boot_nodes) ]
1017 -- Drop the hi-boot ones if told to do so
1019 key_map :: NodeMap Int
1020 key_map = listToFM ([(ms_mod s, ms_hsc_src s) | s <- summaries]
1023 lookup_key :: HscSource -> Module -> Maybe Int
1024 lookup_key hs_src mod = lookupFM key_map (mod, hs_src)
1026 out_edge_keys :: HscSource -> [Module] -> [Int]
1027 out_edge_keys hi_boot ms = mapCatMaybes (lookup_key hi_boot) ms
1028 -- If we want keep_hi_boot_nodes, then we do lookup_key with
1029 -- the IsBootInterface parameter True; else False
1032 type NodeKey = (Module, HscSource) -- The nodes of the graph are
1033 type NodeMap a = FiniteMap NodeKey a -- keyed by (mod, src_file_type) pairs
1035 msKey :: ModSummary -> NodeKey
1036 msKey (ModSummary { ms_mod = mod, ms_hsc_src = boot }) = (mod,boot)
1038 emptyNodeMap :: NodeMap a
1039 emptyNodeMap = emptyFM
1041 mkNodeMap :: [ModSummary] -> NodeMap ModSummary
1042 mkNodeMap summaries = listToFM [ (msKey s, s) | s <- summaries]
1044 nodeMapElts :: NodeMap a -> [a]
1045 nodeMapElts = eltsFM
1047 -- -----------------------------------------------------------------
1048 -- The unlinked image
1050 -- The compilation manager keeps a list of compiled, but as-yet unlinked
1051 -- binaries (byte code or object code). Even when it links bytecode
1052 -- it keeps the unlinked version so it can re-link it later without
1055 type UnlinkedImage = [Linkable] -- the unlinked images (should be a set, really)
1057 findModuleLinkable_maybe :: [Linkable] -> Module -> Maybe Linkable
1058 findModuleLinkable_maybe lis mod
1059 = case [LM time nm us | LM time nm us <- lis, nm == mod] of
1062 many -> pprPanic "findModuleLinkable" (ppr mod)
1064 delModuleLinkable :: [Linkable] -> Module -> [Linkable]
1065 delModuleLinkable ls mod = [ l | l@(LM _ nm _) <- ls, nm /= mod ]
1067 -----------------------------------------------------------------------------
1068 -- Downsweep (dependency analysis)
1070 -- Chase downwards from the specified root set, returning summaries
1071 -- for all home modules encountered. Only follow source-import
1074 -- We pass in the previous collection of summaries, which is used as a
1075 -- cache to avoid recalculating a module summary if the source is
1078 -- The returned list of [ModSummary] nodes has one node for each home-package
1079 -- module, plus one for any hs-boot files. The imports of these nodes
1080 -- are all there, including the imports of non-home-package modules.
1083 -> [ModSummary] -- Old summaries
1084 -> [Module] -- Ignore dependencies on these; treat them as
1085 -- if they were package modules
1087 downsweep hsc_env old_summaries excl_mods
1088 = do rootSummaries <- mapM getRootSummary roots
1089 checkDuplicates rootSummaries
1090 loop (concatMap msDeps rootSummaries)
1091 (mkNodeMap rootSummaries)
1093 roots = hsc_targets hsc_env
1095 old_summary_map :: NodeMap ModSummary
1096 old_summary_map = mkNodeMap old_summaries
1098 getRootSummary :: Target -> IO ModSummary
1099 getRootSummary (Target (TargetFile file) maybe_buf)
1100 = do exists <- doesFileExist file
1101 if exists then summariseFile hsc_env file maybe_buf else do
1102 throwDyn (CmdLineError ("can't find file: " ++ file))
1103 getRootSummary (Target (TargetModule modl) maybe_buf)
1104 = do maybe_summary <- summarise hsc_env emptyNodeMap Nothing False
1105 modl maybe_buf excl_mods
1106 case maybe_summary of
1107 Nothing -> packageModErr modl
1110 -- In a root module, the filename is allowed to diverge from the module
1111 -- name, so we have to check that there aren't multiple root files
1112 -- defining the same module (otherwise the duplicates will be silently
1113 -- ignored, leading to confusing behaviour).
1114 checkDuplicates :: [ModSummary] -> IO ()
1115 checkDuplicates summaries = mapM_ check summaries
1120 many -> multiRootsErr modl many
1121 where modl = ms_mod summ
1123 [ expectJust "checkDup" (ml_hs_file (ms_location summ'))
1124 | summ' <- summaries, ms_mod summ' == modl ]
1126 loop :: [(FilePath,Module,IsBootInterface)]
1127 -- Work list: process these modules
1128 -> NodeMap ModSummary
1131 -- The result includes the worklist, except
1132 -- for those mentioned in the visited set
1133 loop [] done = return (nodeMapElts done)
1134 loop ((cur_path, wanted_mod, is_boot) : ss) done
1135 | key `elemFM` done = loop ss done
1136 | otherwise = do { mb_s <- summarise hsc_env old_summary_map
1137 (Just cur_path) is_boot
1138 wanted_mod Nothing excl_mods
1140 Nothing -> loop ss done
1141 Just s -> loop (msDeps s ++ ss)
1142 (addToFM done key s) }
1144 key = (wanted_mod, if is_boot then HsBootFile else HsSrcFile)
1146 msDeps :: ModSummary -> [(FilePath, -- Importing module
1147 Module, -- Imported module
1148 IsBootInterface)] -- {-# SOURCE #-} import or not
1149 -- (msDeps s) returns the dependencies of the ModSummary s.
1150 -- A wrinkle is that for a {-# SOURCE #-} import we return
1151 -- *both* the hs-boot file
1152 -- *and* the source file
1153 -- as "dependencies". That ensures that the list of all relevant
1154 -- modules always contains B.hs if it contains B.hs-boot.
1155 -- Remember, this pass isn't doing the topological sort. It's
1156 -- just gathering the list of all relevant ModSummaries
1157 msDeps s = concat [ [(f, m, True), (f,m,False)] | m <- ms_srcimps s]
1158 ++ [(f,m,False) | m <- ms_imps s]
1160 f = msHsFilePath s -- Keep the importing module for error reporting
1163 -----------------------------------------------------------------------------
1164 -- Summarising modules
1166 -- We have two types of summarisation:
1168 -- * Summarise a file. This is used for the root module(s) passed to
1169 -- cmLoadModules. The file is read, and used to determine the root
1170 -- module name. The module name may differ from the filename.
1172 -- * Summarise a module. We are given a module name, and must provide
1173 -- a summary. The finder is used to locate the file in which the module
1176 summariseFile :: HscEnv -> FilePath
1177 -> Maybe (StringBuffer,ClockTime)
1179 -- Used for Haskell source only, I think
1180 -- We know the file name, and we know it exists,
1181 -- but we don't necessarily know the module name (might differ)
1182 summariseFile hsc_env file maybe_buf
1183 = do let dflags = hsc_dflags hsc_env
1185 (dflags', hspp_fn, buf)
1186 <- preprocessFile dflags file maybe_buf
1188 (srcimps,the_imps,mod) <- getImports dflags' buf hspp_fn
1190 -- Make a ModLocation for this file
1191 location <- mkHomeModLocation dflags mod file
1193 -- Tell the Finder cache where it is, so that subsequent calls
1194 -- to findModule will find it, even if it's not on any search path
1195 addHomeModuleToFinder hsc_env mod location
1197 src_timestamp <- case maybe_buf of
1198 Just (_,t) -> return t
1199 Nothing -> getModificationTime file
1201 obj_timestamp <- modificationTimeIfExists (ml_obj_file location)
1203 return (ModSummary { ms_mod = mod, ms_hsc_src = HsSrcFile,
1204 ms_location = location,
1205 ms_hspp_file = Just hspp_fn,
1206 ms_hspp_buf = Just buf,
1207 ms_srcimps = srcimps, ms_imps = the_imps,
1208 ms_hs_date = src_timestamp,
1209 ms_obj_date = obj_timestamp })
1211 -- Summarise a module, and pick up source and timestamp.
1213 -> NodeMap ModSummary -- Map of old summaries
1214 -> Maybe FilePath -- Importing module (for error messages)
1215 -> IsBootInterface -- True <=> a {-# SOURCE #-} import
1216 -> Module -- Imported module to be summarised
1217 -> Maybe (StringBuffer, ClockTime)
1218 -> [Module] -- Modules to exclude
1219 -> IO (Maybe ModSummary) -- Its new summary
1221 summarise hsc_env old_summary_map cur_mod is_boot wanted_mod maybe_buf excl_mods
1222 | wanted_mod `elem` excl_mods
1225 | Just old_summary <- lookupFM old_summary_map (wanted_mod, hsc_src)
1226 = do -- Find its new timestamp; all the
1227 -- ModSummaries in the old map have valid ml_hs_files
1228 let location = ms_location old_summary
1229 src_fn = expectJust "summarise" (ml_hs_file location)
1231 -- return the cached summary if the source didn't change
1232 src_timestamp <- case maybe_buf of
1233 Just (_,t) -> return t
1234 Nothing -> getModificationTime src_fn
1236 if ms_hs_date old_summary == src_timestamp
1237 then do -- update the object-file timestamp
1238 obj_timestamp <- getObjTimestamp location is_boot
1239 return (Just old_summary{ ms_obj_date = obj_timestamp })
1241 -- source changed: re-summarise
1242 new_summary location src_fn maybe_buf src_timestamp
1245 = do found <- findModule hsc_env wanted_mod True {-explicit-}
1248 | not (isHomePackage pkg) -> return Nothing
1249 -- Drop external-pkg
1250 | isJust (ml_hs_file location) -> just_found location
1252 err -> noModError dflags cur_mod wanted_mod err
1255 dflags = hsc_dflags hsc_env
1257 hsc_src = if is_boot then HsBootFile else HsSrcFile
1259 just_found location = do
1260 -- Adjust location to point to the hs-boot source file,
1261 -- hi file, object file, when is_boot says so
1262 let location' | is_boot = addBootSuffixLocn location
1263 | otherwise = location
1264 src_fn = expectJust "summarise2" (ml_hs_file location')
1266 -- Check that it exists
1267 -- It might have been deleted since the Finder last found it
1268 maybe_t <- modificationTimeIfExists src_fn
1270 Nothing -> noHsFileErr cur_mod src_fn
1271 Just t -> new_summary location' src_fn Nothing t
1274 new_summary location src_fn maybe_bug src_timestamp
1276 -- Preprocess the source file and get its imports
1277 -- The dflags' contains the OPTIONS pragmas
1278 (dflags', hspp_fn, buf) <- preprocessFile dflags src_fn maybe_buf
1279 (srcimps, the_imps, mod_name) <- getImports dflags' buf hspp_fn
1281 when (mod_name /= wanted_mod) $
1282 throwDyn (ProgramError
1283 (showSDoc (text src_fn
1284 <> text ": file name does not match module name"
1285 <+> quotes (ppr mod_name))))
1287 -- Find the object timestamp, and return the summary
1288 obj_timestamp <- getObjTimestamp location is_boot
1290 return (Just ( ModSummary { ms_mod = wanted_mod,
1291 ms_hsc_src = hsc_src,
1292 ms_location = location,
1293 ms_hspp_file = Just hspp_fn,
1294 ms_hspp_buf = Just buf,
1295 ms_srcimps = srcimps,
1297 ms_hs_date = src_timestamp,
1298 ms_obj_date = obj_timestamp }))
1301 getObjTimestamp location is_boot
1302 = if is_boot then return Nothing
1303 else modificationTimeIfExists (ml_obj_file location)
1306 preprocessFile :: DynFlags -> FilePath -> Maybe (StringBuffer,ClockTime)
1307 -> IO (DynFlags, FilePath, StringBuffer)
1308 preprocessFile dflags src_fn Nothing
1310 (dflags', hspp_fn) <- preprocess dflags src_fn
1311 buf <- hGetStringBuffer hspp_fn
1312 return (dflags', hspp_fn, buf)
1314 preprocessFile dflags src_fn (Just (buf, time))
1316 -- case we bypass the preprocessing stage?
1318 local_opts = getOptionsFromStringBuffer buf
1320 (dflags', errs) <- parseDynamicFlags dflags local_opts
1324 | Unlit _ <- startPhase src_fn = True
1325 -- note: local_opts is only required if there's no Unlit phase
1326 | dopt Opt_Cpp dflags' = True
1327 | dopt Opt_Pp dflags' = True
1330 when needs_preprocessing $
1331 ghcError (ProgramError "buffer needs preprocesing; interactive check disabled")
1333 return (dflags', "<buffer>", buf)
1336 -----------------------------------------------------------------------------
1338 -----------------------------------------------------------------------------
1340 noModError :: DynFlags -> Maybe FilePath -> Module -> FindResult -> IO ab
1341 -- ToDo: we don't have a proper line number for this error
1342 noModError dflags cur_mod wanted_mod err
1343 = throwDyn $ ProgramError $ showSDoc $
1344 vcat [cantFindError dflags wanted_mod err,
1345 nest 2 (parens (pp_where cur_mod))]
1347 noHsFileErr cur_mod path
1348 = throwDyn $ CmdLineError $ showSDoc $
1349 vcat [text "Can't find" <+> text path,
1350 nest 2 (parens (pp_where cur_mod))]
1352 pp_where Nothing = text "one of the roots of the dependency analysis"
1353 pp_where (Just p) = text "imported from" <+> text p
1356 = throwDyn (CmdLineError (showSDoc (text "module" <+>
1357 quotes (ppr mod) <+>
1358 text "is a package module")))
1360 multiRootsErr mod files
1361 = throwDyn (ProgramError (showSDoc (
1362 text "module" <+> quotes (ppr mod) <+>
1363 text "is defined in multiple files:" <+>
1364 sep (map text files))))
1366 cyclicModuleErr :: [ModSummary] -> SDoc
1368 = hang (ptext SLIT("Module imports form a cycle for modules:"))
1369 2 (vcat (map show_one ms))
1371 show_one ms = sep [ show_mod (ms_hsc_src ms) (ms_mod ms),
1372 nest 2 $ ptext SLIT("imports:") <+>
1373 (pp_imps HsBootFile (ms_srcimps ms)
1374 $$ pp_imps HsSrcFile (ms_imps ms))]
1375 show_mod hsc_src mod = ppr mod <> text (hscSourceString hsc_src)
1376 pp_imps src mods = fsep (map (show_mod src) mods)
1379 -- | Inform GHC that the working directory has changed. GHC will flush
1380 -- its cache of module locations, since it may no longer be valid.
1381 -- Note: if you change the working directory, you should also unload
1382 -- the current program (set targets to empty, followed by load).
1383 workingDirectoryChanged :: Session -> IO ()
1384 workingDirectoryChanged s = withSession s $ \hsc_env ->
1385 flushFinderCache (hsc_FC hsc_env)
1387 -- -----------------------------------------------------------------------------
1388 -- inspecting the session
1390 -- | Get the module dependency graph.
1391 getModuleGraph :: Session -> IO ModuleGraph -- ToDo: DiGraph ModSummary
1392 getModuleGraph s = withSession s (return . hsc_mod_graph)
1394 isLoaded :: Session -> Module -> IO Bool
1395 isLoaded s m = withSession s $ \hsc_env ->
1396 return $! isJust (lookupModuleEnv (hsc_HPT hsc_env) m)
1398 getBindings :: Session -> IO [TyThing]
1399 getBindings s = withSession s (return . nameEnvElts . ic_type_env . hsc_IC)
1401 getPrintUnqual :: Session -> IO PrintUnqualified
1402 getPrintUnqual s = withSession s (return . icPrintUnqual . hsc_IC)
1405 getModuleInfo :: Session -> Module -> IO ModuleInfo
1409 | BinaryCode FilePath
1411 data ModuleInfo = ModuleInfo {
1412 lm_modulename :: Module,
1413 lm_summary :: ModSummary,
1414 lm_interface :: ModIface,
1415 lm_tc_code :: Maybe TypecheckedCode,
1416 lm_rn_code :: Maybe RenamedCode,
1417 lm_obj :: Maybe ObjectCode
1420 type TypecheckedCode = HsTypecheckedGroup
1421 type RenamedCode = [HsGroup Name]
1423 -- ToDo: typechecks abstract syntax or renamed abstract syntax. Issues:
1424 -- - typechecked syntax includes extra dictionary translation and
1425 -- AbsBinds which need to be translated back into something closer to
1426 -- the original source.
1427 -- - renamed syntax currently doesn't exist in a single blob, since
1428 -- renaming and typechecking are interleaved at splice points. We'd
1429 -- need a restriction that there are no splices in the source module.
1432 -- - Data and Typeable instances for HsSyn.
1435 -- - things that aren't in the output of the renamer:
1436 -- - the export list
1440 -- - things that aren't in the output of the typechecker right now:
1441 -- - the export list
1443 -- - type signatures
1444 -- - type/data/newtype declarations
1445 -- - class declarations
1447 -- - extra things in the typechecker's output:
1448 -- - default methods are turned into top-level decls.
1449 -- - dictionary bindings
1451 -- ToDo: check for small transformations that happen to the syntax in
1452 -- the typechecker (eg. -e ==> negate e, perhaps for fromIntegral)
1454 -- ToDo: maybe use TH syntax instead of IfaceSyn? There's already a way
1455 -- to get from TyCons, Ids etc. to TH syntax (reify).
1457 -- :browse will use either lm_toplev or inspect lm_interface, depending
1458 -- on whether the module is interpreted or not.
1460 -- various abstract syntax types (perhaps IfaceBlah)
1464 -- This is for reconstructing refactored source code
1465 -- Calls the lexer repeatedly.
1466 -- ToDo: add comment tokens to token stream
1467 getTokenStream :: Session -> Module -> IO [Located Token]
1470 -- -----------------------------------------------------------------------------
1471 -- Interactive evaluation
1475 -- | Set the interactive evaluation context.
1477 -- Setting the context doesn't throw away any bindings; the bindings
1478 -- we've built up in the InteractiveContext simply move to the new
1479 -- module. They always shadow anything in scope in the current context.
1480 setContext :: Session
1481 -> [Module] -- entire top level scope of these modules
1482 -> [Module] -- exports only of these modules
1484 setContext (Session ref) toplevs exports = do
1485 hsc_env <- readIORef ref
1486 let old_ic = hsc_IC hsc_env
1487 hpt = hsc_HPT hsc_env
1489 mapM_ (checkModuleExists hsc_env hpt) exports
1490 export_env <- mkExportEnv hsc_env exports
1491 toplev_envs <- mapM (mkTopLevEnv hpt) toplevs
1492 let all_env = foldr plusGlobalRdrEnv export_env toplev_envs
1493 writeIORef ref hsc_env{ hsc_IC = old_ic { ic_toplev_scope = toplevs,
1494 ic_exports = exports,
1495 ic_rn_gbl_env = all_env } }
1497 checkModuleExists :: HscEnv -> HomePackageTable -> Module -> IO ()
1498 checkModuleExists hsc_env hpt mod =
1499 case lookupModuleEnv hpt mod of
1500 Just mod_info -> return ()
1501 _not_a_home_module -> do
1502 res <- findPackageModule hsc_env mod True
1504 Found _ _ -> return ()
1505 err -> let msg = cantFindError (hsc_dflags hsc_env) mod err in
1506 throwDyn (CmdLineError (showSDoc msg))
1508 mkTopLevEnv :: HomePackageTable -> Module -> IO GlobalRdrEnv
1509 mkTopLevEnv hpt modl
1510 = case lookupModuleEnv hpt modl of
1512 throwDyn (ProgramError ("mkTopLevEnv: not a home module "
1513 ++ showSDoc (pprModule modl)))
1515 case mi_globals (hm_iface details) of
1517 throwDyn (ProgramError ("mkTopLevEnv: not interpreted "
1518 ++ showSDoc (pprModule modl)))
1519 Just env -> return env
1521 -- | Get the interactive evaluation context, consisting of a pair of the
1522 -- set of modules from which we take the full top-level scope, and the set
1523 -- of modules from which we take just the exports respectively.
1524 getContext :: Session -> IO ([Module],[Module])
1525 getContext s = withSession s (\HscEnv{ hsc_IC=ic } ->
1526 return (ic_toplev_scope ic, ic_exports ic))
1528 -- | Returns 'True' if the specified module is interpreted, and hence has
1529 -- its full top-level scope available.
1530 moduleIsInterpreted :: Session -> Module -> IO Bool
1531 moduleIsInterpreted s modl = withSession s $ \h ->
1532 case lookupModuleEnv (hsc_HPT h) modl of
1533 Just details -> return (isJust (mi_globals (hm_iface details)))
1534 _not_a_home_module -> return False
1536 -- | Looks up an identifier in the current interactive context (for :info)
1537 getInfo :: Session -> String -> IO [GetInfoResult]
1538 getInfo s id = withSession s $ \hsc_env -> hscGetInfo hsc_env id
1540 -- -----------------------------------------------------------------------------
1541 -- Getting the type of an expression
1543 -- | Get the type of an expression
1544 exprType :: Session -> String -> IO (Maybe Type)
1545 exprType s expr = withSession s $ \hsc_env -> do
1546 maybe_stuff <- hscTcExpr hsc_env expr
1548 Nothing -> return Nothing
1549 Just ty -> return (Just tidy_ty)
1551 tidy_ty = tidyType emptyTidyEnv ty
1552 dflags = hsc_dflags hsc_env
1554 -- -----------------------------------------------------------------------------
1555 -- Getting the kind of a type
1557 -- | Get the kind of a type
1558 typeKind :: Session -> String -> IO (Maybe Kind)
1559 typeKind s str = withSession s $ \hsc_env -> do
1560 maybe_stuff <- hscKcType hsc_env str
1562 Nothing -> return Nothing
1563 Just kind -> return (Just kind)
1565 -----------------------------------------------------------------------------
1566 -- lookupName: returns the TyThing for a Name in the interactive context.
1567 -- ToDo: should look it up in the full environment
1569 lookupName :: Session -> Name -> IO (Maybe TyThing)
1570 lookupName s name = withSession s $ \hsc_env -> do
1571 return $! lookupNameEnv (ic_type_env (hsc_IC hsc_env)) name
1573 -----------------------------------------------------------------------------
1574 -- cmCompileExpr: compile an expression and deliver an HValue
1576 compileExpr :: Session -> String -> IO (Maybe HValue)
1577 compileExpr s expr = withSession s $ \hsc_env -> do
1578 maybe_stuff <- hscStmt hsc_env ("let __cmCompileExpr = "++expr)
1580 Nothing -> return Nothing
1581 Just (new_ic, names, hval) -> do
1583 hvals <- (unsafeCoerce# hval) :: IO [HValue]
1585 case (names,hvals) of
1586 ([n],[hv]) -> return (Just hv)
1587 _ -> panic "compileExpr"
1589 -- -----------------------------------------------------------------------------
1590 -- running a statement interactively
1593 = RunOk [Name] -- ^ names bound by this evaluation
1594 | RunFailed -- ^ statement failed compilation
1595 | RunException Exception -- ^ statement raised an exception
1597 -- | Run a statement in the current interactive context. Statemenet
1598 -- may bind multple values.
1599 runStmt :: Session -> String -> IO RunResult
1600 runStmt (Session ref) expr
1602 hsc_env <- readIORef ref
1604 -- Turn off -fwarn-unused-bindings when running a statement, to hide
1605 -- warnings about the implicit bindings we introduce.
1606 let dflags' = dopt_unset (hsc_dflags hsc_env) Opt_WarnUnusedBinds
1607 hsc_env' = hsc_env{ hsc_dflags = dflags' }
1609 maybe_stuff <- hscStmt hsc_env' expr
1612 Nothing -> return RunFailed
1613 Just (new_hsc_env, names, hval) -> do
1615 let thing_to_run = unsafeCoerce# hval :: IO [HValue]
1616 either_hvals <- sandboxIO thing_to_run
1618 case either_hvals of
1620 -- on error, keep the *old* interactive context,
1621 -- so that 'it' is not bound to something
1622 -- that doesn't exist.
1623 return (RunException e)
1626 -- Get the newly bound things, and bind them.
1627 -- Don't need to delete any shadowed bindings;
1628 -- the new ones override the old ones.
1629 extendLinkEnv (zip names hvals)
1631 writeIORef ref new_hsc_env
1632 return (RunOk names)
1635 -- We run the statement in a "sandbox" to protect the rest of the
1636 -- system from anything the expression might do. For now, this
1637 -- consists of just wrapping it in an exception handler, but see below
1638 -- for another version.
1640 sandboxIO :: IO a -> IO (Either Exception a)
1641 sandboxIO thing = Exception.try thing
1644 -- This version of sandboxIO runs the expression in a completely new
1645 -- RTS main thread. It is disabled for now because ^C exceptions
1646 -- won't be delivered to the new thread, instead they'll be delivered
1647 -- to the (blocked) GHCi main thread.
1649 -- SLPJ: when re-enabling this, reflect a wrong-stat error as an exception
1651 sandboxIO :: IO a -> IO (Either Int (Either Exception a))
1652 sandboxIO thing = do
1653 st_thing <- newStablePtr (Exception.try thing)
1654 alloca $ \ p_st_result -> do
1655 stat <- rts_evalStableIO st_thing p_st_result
1656 freeStablePtr st_thing
1658 then do st_result <- peek p_st_result
1659 result <- deRefStablePtr st_result
1660 freeStablePtr st_result
1661 return (Right result)
1663 return (Left (fromIntegral stat))
1665 foreign import "rts_evalStableIO" {- safe -}
1666 rts_evalStableIO :: StablePtr (IO a) -> Ptr (StablePtr a) -> IO CInt
1667 -- more informative than the C type!
1670 -- ---------------------------------------------------------------------------
1671 -- cmBrowseModule: get all the TyThings defined in a module
1673 browseModule :: Session -> Module -> Bool -> IO [IfaceDecl]
1674 browseModule s modl exports_only = withSession s $ \hsc_env -> do
1675 mb_decls <- getModuleContents hsc_env modl exports_only
1677 Nothing -> return [] -- An error of some kind
1678 Just ds -> return ds
1681 -----------------------------------------------------------------------------
1682 -- show a module and it's source/object filenames
1684 showModule :: Session -> ModSummary -> IO String
1685 showModule s mod_summary = withSession s $ \hsc_env -> do
1686 case lookupModuleEnv (hsc_HPT hsc_env) (ms_mod mod_summary) of
1687 Nothing -> panic "missing linkable"
1688 Just mod_info -> return (showModMsg obj_linkable mod_summary)
1690 obj_linkable = isObjectLinkable (fromJust (hm_linkable mod_info))