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 ( 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 RdrName ( GlobalRdrEnv )
102 import HsSyn ( HsModule, LHsBinds )
103 import Type ( Kind, Type, dropForAlls )
104 import Id ( Id, idType )
105 import TyCon ( TyCon )
106 import Class ( Class )
107 import DataCon ( DataCon )
109 import RdrName ( RdrName )
110 import NameEnv ( nameEnvElts )
111 import SrcLoc ( Located )
112 import DriverPipeline
113 import DriverPhases ( Phase(..), isHaskellSrcFilename, startPhase )
114 import GetImports ( getImports )
115 import Packages ( isHomePackage )
117 import HscMain ( newHscEnv, hscFileCheck, HscResult(..) )
121 import SysTools ( initSysTools, cleanTempFiles )
126 import ErrUtils ( showPass, Messages, putMsg )
127 import qualified ErrUtils
129 import StringBuffer ( StringBuffer, hGetStringBuffer )
131 import SysTools ( cleanTempFilesExcept )
132 import BasicTypes ( SuccessFlag(..), succeeded, failed )
133 import Maybes ( orElse, expectJust, mapCatMaybes )
135 import Directory ( getModificationTime, doesFileExist )
136 import Maybe ( isJust, isNothing, fromJust )
137 import Maybes ( expectJust )
138 import List ( partition, nub )
139 import qualified List
140 import Monad ( unless, when, foldM )
141 import System ( exitWith, ExitCode(..) )
142 import Time ( ClockTime )
143 import EXCEPTION as Exception hiding (handle)
146 import Prelude hiding (init)
148 -- -----------------------------------------------------------------------------
149 -- Exception handlers
151 -- | Install some default exception handlers and run the inner computation.
152 -- Unless you want to handle exceptions yourself, you should wrap this around
153 -- the top level of your program. The default handlers output the error
154 -- message(s) to stderr and exit cleanly.
155 defaultErrorHandler :: IO a -> IO a
156 defaultErrorHandler inner =
157 -- top-level exception handler: any unrecognised exception is a compiler bug.
158 handle (\exception -> do
161 -- an IO exception probably isn't our fault, so don't panic
162 IOException _ -> hPutStrLn stderr (show exception)
163 AsyncException StackOverflow ->
164 hPutStrLn stderr "stack overflow: use +RTS -K<size> to increase it"
165 _other -> hPutStr stderr (show (Panic (show exception)))
166 exitWith (ExitFailure 1)
169 -- all error messages are propagated as exceptions
170 handleDyn (\dyn -> do
173 PhaseFailed _ code -> exitWith code
174 Interrupted -> exitWith (ExitFailure 1)
175 _ -> do hPutStrLn stderr (show (dyn :: GhcException))
176 exitWith (ExitFailure 1)
180 -- | Install a default cleanup handler to remove temporary files
181 -- deposited by a GHC run. This is seperate from
182 -- 'defaultErrorHandler', because you might want to override the error
183 -- handling, but still get the ordinary cleanup behaviour.
184 defaultCleanupHandler :: DynFlags -> IO a -> IO a
185 defaultCleanupHandler dflags inner =
186 -- make sure we clean up after ourselves
187 later (unless (dopt Opt_KeepTmpFiles dflags) $
188 cleanTempFiles dflags)
189 -- exceptions will be blocked while we clean the temporary files,
190 -- so there shouldn't be any difficulty if we receive further
195 -- | Initialises GHC. This must be done /once/ only. Takes the
196 -- command-line arguments. All command-line arguments which aren't
197 -- understood by GHC will be returned.
199 init :: [String] -> IO [String]
202 installSignalHandlers
204 -- Grab the -B option if there is one
205 let (minusB_args, argv1) = partition (prefixMatch "-B") args
206 dflags0 <- initSysTools minusB_args defaultDynFlags
207 writeIORef v_initDynFlags dflags0
209 -- Parse the static flags
210 argv2 <- parseStaticFlags argv1
213 GLOBAL_VAR(v_initDynFlags, error "initDynFlags", DynFlags)
214 -- stores the DynFlags between the call to init and subsequent
215 -- calls to newSession.
217 -- | Starts a new session. A session consists of a set of loaded
218 -- modules, a set of options (DynFlags), and an interactive context.
219 -- ToDo: GhcMode should say "keep typechecked code" and\/or "keep renamed
221 newSession :: GhcMode -> IO Session
223 dflags0 <- readIORef v_initDynFlags
224 dflags <- initDynFlags dflags0
225 env <- newHscEnv dflags{ ghcMode=mode }
229 -- tmp: this breaks the abstraction, but required because DriverMkDepend
230 -- needs to call the Finder. ToDo: untangle this.
231 sessionHscEnv :: Session -> IO HscEnv
232 sessionHscEnv (Session ref) = readIORef ref
234 withSession :: Session -> (HscEnv -> IO a) -> IO a
235 withSession (Session ref) f = do h <- readIORef ref; f h
237 modifySession :: Session -> (HscEnv -> HscEnv) -> IO ()
238 modifySession (Session ref) f = do h <- readIORef ref; writeIORef ref $! f h
240 -- -----------------------------------------------------------------------------
243 -- | Grabs the DynFlags from the Session
244 getSessionDynFlags :: Session -> IO DynFlags
245 getSessionDynFlags s = withSession s (return . hsc_dflags)
247 -- | Updates the DynFlags in a Session
248 setSessionDynFlags :: Session -> DynFlags -> IO ()
249 setSessionDynFlags s dflags = modifySession s (\h -> h{ hsc_dflags = dflags })
251 -- | Messages during compilation (eg. warnings and progress messages)
252 -- are reported using this callback. By default, these messages are
253 -- printed to stderr.
254 setMsgHandler :: (String -> IO ()) -> IO ()
255 setMsgHandler = ErrUtils.setMsgHandler
257 -- -----------------------------------------------------------------------------
260 -- ToDo: think about relative vs. absolute file paths. And what
261 -- happens when the current directory changes.
263 -- | Sets the targets for this session. Each target may be a module name
264 -- or a filename. The targets correspond to the set of root modules for
265 -- the program\/library. Unloading the current program is achieved by
266 -- setting the current set of targets to be empty, followed by load.
267 setTargets :: Session -> [Target] -> IO ()
268 setTargets s targets = modifySession s (\h -> h{ hsc_targets = targets })
270 -- | returns the current set of targets
271 getTargets :: Session -> IO [Target]
272 getTargets s = withSession s (return . hsc_targets)
274 -- | Add another target
275 addTarget :: Session -> Target -> IO ()
277 = modifySession s (\h -> h{ hsc_targets = target : hsc_targets h })
280 removeTarget :: Session -> TargetId -> IO ()
281 removeTarget s target_id
282 = modifySession s (\h -> h{ hsc_targets = filter (hsc_targets h) })
284 filter targets = [ t | t@(Target id _) <- targets, id /= target_id ]
286 -- Attempts to guess what Target a string refers to. This function implements
287 -- the --make/GHCi command-line syntax for filenames:
289 -- - if the string looks like a Haskell source filename, then interpret
291 -- - if adding a .hs or .lhs suffix yields the name of an existing file,
293 -- - otherwise interpret the string as a module name
295 guessTarget :: String -> IO Target
297 | isHaskellSrcFilename file
298 = return (Target (TargetFile file) Nothing)
300 = do exists <- doesFileExist hs_file
301 if exists then return (Target (TargetFile hs_file) Nothing) else do
302 exists <- doesFileExist lhs_file
303 if exists then return (Target (TargetFile lhs_file) Nothing) else do
304 return (Target (TargetModule (mkModule file)) Nothing)
306 hs_file = file ++ ".hs"
307 lhs_file = file ++ ".lhs"
309 -- -----------------------------------------------------------------------------
310 -- Loading the program
312 -- Perform a dependency analysis starting from the current targets
313 -- and update the session with the new module graph.
314 depanal :: Session -> [Module] -> IO ()
315 depanal (Session ref) excluded_mods = do
316 hsc_env <- readIORef ref
318 dflags = hsc_dflags hsc_env
319 gmode = ghcMode (hsc_dflags hsc_env)
320 targets = hsc_targets hsc_env
321 old_graph = hsc_mod_graph hsc_env
323 showPass dflags "Chasing dependencies"
324 when (verbosity dflags >= 1 && gmode == BatchCompile) $
325 hPutStrLn stderr (showSDoc (hcat [
326 text "Chasing modules from: ",
327 hcat (punctuate comma (map pprTarget targets))]))
329 graph <- downsweep hsc_env old_graph excluded_mods
330 writeIORef ref hsc_env{ hsc_mod_graph=graph }
333 -- | The result of load.
335 = LoadOk Errors -- ^ all specified targets were loaded successfully.
336 | LoadFailed Errors -- ^ not all modules were loaded.
338 type Errors = [String]
340 data ErrMsg = ErrMsg {
341 errMsgSeverity :: Severity, -- warning, error, etc.
342 errMsgSpans :: [SrcSpan],
343 errMsgShortDoc :: Doc,
344 errMsgExtraInfo :: Doc
351 | LoadDependenciesOf Module
353 -- | Try to load the program. If a Module is supplied, then just
354 -- attempt to load up to this target. If no Module is supplied,
355 -- then try to load all targets.
356 load :: Session -> LoadHowMuch -> IO SuccessFlag
357 load s@(Session ref) how_much
359 -- Dependency analysis first. Note that this fixes the module graph:
360 -- even if we don't get a fully successful upsweep, the full module
361 -- graph is still retained in the Session. We can tell which modules
362 -- were successfully loaded by inspecting the Session's HPT.
365 hsc_env <- readIORef ref
367 let hpt1 = hsc_HPT hsc_env
368 let dflags = hsc_dflags hsc_env
369 let mod_graph = hsc_mod_graph hsc_env
371 let ghci_mode = ghcMode (hsc_dflags hsc_env) -- this never changes
372 let verb = verbosity dflags
374 -- The "bad" boot modules are the ones for which we have
375 -- B.hs-boot in the module graph, but no B.hs
376 -- The downsweep should have ensured this does not happen
378 let all_home_mods = [ms_mod s | s <- mod_graph, not (isBootSummary s)]
379 bad_boot_mods = [s | s <- mod_graph, isBootSummary s,
380 not (ms_mod s `elem` all_home_mods)]
381 ASSERT( null bad_boot_mods ) return ()
383 -- mg2_with_srcimps drops the hi-boot nodes, returning a
384 -- graph with cycles. Among other things, it is used for
385 -- backing out partially complete cycles following a failed
386 -- upsweep, and for removing from hpt all the modules
387 -- not in strict downwards closure, during calls to compile.
388 let mg2_with_srcimps :: [SCC ModSummary]
389 mg2_with_srcimps = topSortModuleGraph True mod_graph Nothing
391 -- check the stability property for each module.
392 stable_mods@(stable_obj,stable_bco)
393 | BatchCompile <- ghci_mode = ([],[])
394 | otherwise = checkStability hpt1 mg2_with_srcimps all_home_mods
396 -- prune bits of the HPT which are definitely redundant now,
398 pruned_hpt = pruneHomePackageTable hpt1
399 (flattenSCCs mg2_with_srcimps)
405 putStrLn (showSDoc (text "Stable obj:" <+> ppr stable_obj $$
406 text "Stable BCO:" <+> ppr stable_bco))
408 -- Unload any modules which are going to be re-linked this time around.
409 let stable_linkables = [ linkable
410 | m <- stable_obj++stable_bco,
411 Just hmi <- [lookupModuleEnv pruned_hpt m],
412 Just linkable <- [hm_linkable hmi] ]
413 unload hsc_env stable_linkables
415 -- We could at this point detect cycles which aren't broken by
416 -- a source-import, and complain immediately, but it seems better
417 -- to let upsweep_mods do this, so at least some useful work gets
418 -- done before the upsweep is abandoned.
419 --hPutStrLn stderr "after tsort:\n"
420 --hPutStrLn stderr (showSDoc (vcat (map ppr mg2)))
422 -- Now do the upsweep, calling compile for each module in
423 -- turn. Final result is version 3 of everything.
425 -- Topologically sort the module graph, this time including hi-boot
426 -- nodes, and possibly just including the portion of the graph
427 -- reachable from the module specified in the 2nd argument to load.
428 -- This graph should be cycle-free.
429 -- If we're restricting the upsweep to a portion of the graph, we
430 -- also want to retain everything that is still stable.
431 let full_mg :: [SCC ModSummary]
432 full_mg = topSortModuleGraph False mod_graph Nothing
434 maybe_top_mod = case how_much of
436 LoadDependenciesOf m -> Just m
439 partial_mg0 :: [SCC ModSummary]
440 partial_mg0 = topSortModuleGraph False mod_graph maybe_top_mod
442 -- LoadDependenciesOf m: we want the upsweep to stop just
443 -- short of the specified module (unless the specified module
446 | LoadDependenciesOf mod <- how_much
447 = ASSERT( case last partial_mg0 of
448 AcyclicSCC ms -> ms_mod ms == mod; _ -> False )
449 List.init partial_mg0
455 | AcyclicSCC ms <- full_mg,
456 ms_mod ms `elem` stable_obj++stable_bco,
457 ms_mod ms `notElem` [ ms_mod ms' |
458 AcyclicSCC ms' <- partial_mg ] ]
460 mg = stable_mg ++ partial_mg
462 -- clean up between compilations
463 let cleanup = cleanTempFilesExcept dflags
464 (ppFilesFromSummaries (flattenSCCs mg2_with_srcimps))
466 (upsweep_ok, hsc_env1, modsUpswept)
467 <- upsweep (hsc_env { hsc_HPT = emptyHomePackageTable })
468 pruned_hpt stable_mods cleanup mg
470 -- Make modsDone be the summaries for each home module now
471 -- available; this should equal the domain of hpt3.
472 -- Get in in a roughly top .. bottom order (hence reverse).
474 let modsDone = reverse modsUpswept
476 -- Try and do linking in some form, depending on whether the
477 -- upsweep was completely or only partially successful.
479 if succeeded upsweep_ok
482 -- Easy; just relink it all.
483 do when (verb >= 2) $ putMsg "Upsweep completely successful."
485 -- Clean up after ourselves
486 cleanTempFilesExcept dflags (ppFilesFromSummaries modsDone)
488 -- Issue a warning for the confusing case where the user
489 -- said '-o foo' but we're not going to do any linking.
490 -- We attempt linking if either (a) one of the modules is
491 -- called Main, or (b) the user said -no-hs-main, indicating
492 -- that main() is going to come from somewhere else.
494 let ofile = outputFile dflags
495 let no_hs_main = dopt Opt_NoHsMain dflags
496 let mb_main_mod = mainModIs dflags
498 main_mod = mb_main_mod `orElse` "Main"
500 = any ((==main_mod).moduleUserString.ms_mod)
502 do_linking = a_root_is_Main || no_hs_main
504 when (ghci_mode == BatchCompile && isJust ofile && not do_linking
506 putMsg ("Warning: output was redirected with -o, " ++
507 "but no output will be generated\n" ++
508 "because there is no " ++ main_mod ++ " module.")
510 -- link everything together
511 linkresult <- link ghci_mode dflags do_linking (hsc_HPT hsc_env1)
513 loadFinish Succeeded linkresult ref hsc_env1
516 -- Tricky. We need to back out the effects of compiling any
517 -- half-done cycles, both so as to clean up the top level envs
518 -- and to avoid telling the interactive linker to link them.
519 do when (verb >= 2) $ putMsg "Upsweep partially successful."
522 = map ms_mod modsDone
523 let mods_to_zap_names
524 = findPartiallyCompletedCycles modsDone_names
527 = filter ((`notElem` mods_to_zap_names).ms_mod)
530 let hpt4 = retainInTopLevelEnvs (map ms_mod mods_to_keep)
533 -- Clean up after ourselves
534 cleanTempFilesExcept dflags (ppFilesFromSummaries mods_to_keep)
536 -- there should be no Nothings where linkables should be, now
537 ASSERT(all (isJust.hm_linkable)
538 (moduleEnvElts (hsc_HPT hsc_env))) do
540 -- Link everything together
541 linkresult <- link ghci_mode dflags False hpt4
543 let hsc_env4 = hsc_env1{ hsc_HPT = hpt4 }
544 loadFinish Failed linkresult ref hsc_env4
546 -- Finish up after a load.
548 -- If the link failed, unload everything and return.
549 loadFinish all_ok Failed ref hsc_env
550 = do unload hsc_env []
551 writeIORef ref $! discardProg hsc_env
554 -- Empty the interactive context and set the module context to the topmost
555 -- newly loaded module, or the Prelude if none were loaded.
556 loadFinish all_ok Succeeded ref hsc_env
557 = do writeIORef ref $! hsc_env{ hsc_IC = emptyInteractiveContext }
561 -- Forget the current program, but retain the persistent info in HscEnv
562 discardProg :: HscEnv -> HscEnv
564 = hsc_env { hsc_mod_graph = emptyMG,
565 hsc_IC = emptyInteractiveContext,
566 hsc_HPT = emptyHomePackageTable }
568 -- used to fish out the preprocess output files for the purposes of
569 -- cleaning up. The preprocessed file *might* be the same as the
570 -- source file, but that doesn't do any harm.
571 ppFilesFromSummaries summaries = [ fn | Just fn <- map ms_hspp_file summaries ]
573 -- -----------------------------------------------------------------------------
577 CheckedModule { parsedSource :: ParsedSource,
578 typecheckedSource :: Maybe TypecheckedSource
581 type ParsedSource = Located (HsModule RdrName)
582 type TypecheckedSource = (LHsBinds Id, GlobalRdrEnv)
584 -- | This is the way to get access to parsed and typechecked source code
585 -- for a module. 'checkModule' loads all the dependencies of the specified
586 -- module in the Session, and then attempts to typecheck the module. If
587 -- successful, it returns the abstract syntax for the module.
588 checkModule :: Session -> Module -> (Messages -> IO ())
589 -> IO (Maybe CheckedModule)
590 checkModule session@(Session ref) mod msg_act = do
591 -- load up the dependencies first
592 r <- load session (LoadDependenciesOf mod)
593 if (failed r) then return Nothing else do
595 -- now parse & typecheck the module
596 hsc_env <- readIORef ref
597 let mg = hsc_mod_graph hsc_env
598 case [ ms | ms <- mg, ms_mod ms == mod ] of
601 r <- hscFileCheck hsc_env msg_act ms
605 HscChecked parsed tcd ->
606 return (Just (CheckedModule parsed tcd) )
608 -----------------------------------------------------------------------------
611 unload :: HscEnv -> [Linkable] -> IO ()
612 unload hsc_env stable_linkables -- Unload everthing *except* 'stable_linkables'
613 = case ghcMode (hsc_dflags hsc_env) of
614 BatchCompile -> return ()
615 JustTypecheck -> return ()
617 Interactive -> Linker.unload (hsc_dflags hsc_env) stable_linkables
619 Interactive -> panic "unload: no interpreter"
621 other -> panic "unload: strange mode"
623 -- -----------------------------------------------------------------------------
627 Stability tells us which modules definitely do not need to be recompiled.
628 There are two main reasons for having stability:
630 - avoid doing a complete upsweep of the module graph in GHCi when
631 modules near the bottom of the tree have not changed.
633 - to tell GHCi when it can load object code: we can only load object code
634 for a module when we also load object code fo all of the imports of the
635 module. So we need to know that we will definitely not be recompiling
636 any of these modules, and we can use the object code.
638 NB. stability is of no importance to BatchCompile at all, only Interactive.
639 (ToDo: what about JustTypecheck?)
641 The stability check is as follows. Both stableObject and
642 stableBCO are used during the upsweep phase later.
645 stable m = stableObject m || stableBCO m
648 all stableObject (imports m)
649 && old linkable does not exist, or is == on-disk .o
650 && date(on-disk .o) > date(.hs)
653 all stable (imports m)
654 && date(BCO) > date(.hs)
657 These properties embody the following ideas:
659 - if a module is stable:
660 - if it has been compiled in a previous pass (present in HPT)
661 then it does not need to be compiled or re-linked.
662 - if it has not been compiled in a previous pass,
663 then we only need to read its .hi file from disk and
664 link it to produce a ModDetails.
666 - if a modules is not stable, we will definitely be at least
667 re-linking, and possibly re-compiling it during the upsweep.
668 All non-stable modules can (and should) therefore be unlinked
671 - Note that objects are only considered stable if they only depend
672 on other objects. We can't link object code against byte code.
676 :: HomePackageTable -- HPT from last compilation
677 -> [SCC ModSummary] -- current module graph (cyclic)
678 -> [Module] -- all home modules
679 -> ([Module], -- stableObject
680 [Module]) -- stableBCO
682 checkStability hpt sccs all_home_mods = foldl checkSCC ([],[]) sccs
684 checkSCC (stable_obj, stable_bco) scc0
685 | stableObjects = (scc_mods ++ stable_obj, stable_bco)
686 | stableBCOs = (stable_obj, scc_mods ++ stable_bco)
687 | otherwise = (stable_obj, stable_bco)
689 scc = flattenSCC scc0
690 scc_mods = map ms_mod scc
691 home_module m = m `elem` all_home_mods && m `notElem` scc_mods
693 scc_allimps = nub (filter home_module (concatMap ms_allimps scc))
694 -- all imports outside the current SCC, but in the home pkg
696 stable_obj_imps = map (`elem` stable_obj) scc_allimps
697 stable_bco_imps = map (`elem` stable_bco) scc_allimps
704 and (zipWith (||) stable_obj_imps stable_bco_imps)
708 | Just t <- ms_obj_date ms = t >= ms_hs_date ms
712 same_as_prev t = case lookupModuleEnv hpt (ms_mod ms) of
714 Just hmi | Just l <- hm_linkable hmi
715 -> isObjectLinkable l && t == linkableTime l
716 -- why '>=' rather than '>' above? If the filesystem stores
717 -- times to the nearset second, we may occasionally find that
718 -- the object & source have the same modification time,
719 -- especially if the source was automatically generated
720 -- and compiled. Using >= is slightly unsafe, but it matches
724 = case lookupModuleEnv hpt (ms_mod ms) of
726 Just hmi | Just l <- hm_linkable hmi ->
727 not (isObjectLinkable l) &&
728 linkableTime l >= ms_hs_date ms
730 ms_allimps :: ModSummary -> [Module]
731 ms_allimps ms = ms_srcimps ms ++ ms_imps ms
733 -- -----------------------------------------------------------------------------
734 -- Prune the HomePackageTable
736 -- Before doing an upsweep, we can throw away:
738 -- - For non-stable modules:
739 -- - all ModDetails, all linked code
740 -- - all unlinked code that is out of date with respect to
743 -- This is VERY IMPORTANT otherwise we'll end up requiring 2x the
744 -- space at the end of the upsweep, because the topmost ModDetails of the
745 -- old HPT holds on to the entire type environment from the previous
748 pruneHomePackageTable
751 -> ([Module],[Module])
754 pruneHomePackageTable hpt summ (stable_obj, stable_bco)
755 = mapModuleEnv prune hpt
757 | is_stable modl = hmi'
758 | otherwise = hmi'{ hm_details = emptyModDetails }
760 modl = mi_module (hm_iface hmi)
761 hmi' | Just l <- hm_linkable hmi, linkableTime l < ms_hs_date ms
762 = hmi{ hm_linkable = Nothing }
765 where ms = expectJust "prune" (lookupModuleEnv ms_map modl)
767 ms_map = mkModuleEnv [(ms_mod ms, ms) | ms <- summ]
769 is_stable m = m `elem` stable_obj || m `elem` stable_bco
771 -- -----------------------------------------------------------------------------
773 -- Return (names of) all those in modsDone who are part of a cycle
774 -- as defined by theGraph.
775 findPartiallyCompletedCycles :: [Module] -> [SCC ModSummary] -> [Module]
776 findPartiallyCompletedCycles modsDone theGraph
780 chew ((AcyclicSCC v):rest) = chew rest -- acyclic? not interesting.
781 chew ((CyclicSCC vs):rest)
782 = let names_in_this_cycle = nub (map ms_mod vs)
784 = nub ([done | done <- modsDone,
785 done `elem` names_in_this_cycle])
786 chewed_rest = chew rest
788 if notNull mods_in_this_cycle
789 && length mods_in_this_cycle < length names_in_this_cycle
790 then mods_in_this_cycle ++ chewed_rest
793 -- -----------------------------------------------------------------------------
796 -- This is where we compile each module in the module graph, in a pass
797 -- from the bottom to the top of the graph.
799 -- There better had not be any cyclic groups here -- we check for them.
802 :: HscEnv -- Includes initially-empty HPT
803 -> HomePackageTable -- HPT from last time round (pruned)
804 -> ([Module],[Module]) -- stable modules (see checkStability)
805 -> IO () -- How to clean up unwanted tmp files
806 -> [SCC ModSummary] -- Mods to do (the worklist)
808 HscEnv, -- With an updated HPT
809 [ModSummary]) -- Mods which succeeded
811 upsweep hsc_env old_hpt stable_mods cleanup
813 = return (Succeeded, hsc_env, [])
815 upsweep hsc_env old_hpt stable_mods cleanup
817 = do hPutStrLn stderr (showSDoc (cyclicModuleErr ms))
818 return (Failed, hsc_env, [])
820 upsweep hsc_env old_hpt stable_mods cleanup
821 (AcyclicSCC mod:mods)
822 = do -- putStrLn ("UPSWEEP_MOD: hpt = " ++
823 -- show (map (moduleUserString.moduleName.mi_module.hm_iface)
824 -- (moduleEnvElts (hsc_HPT hsc_env)))
826 mb_mod_info <- upsweep_mod hsc_env old_hpt stable_mods mod
828 cleanup -- Remove unwanted tmp files between compilations
831 Nothing -> return (Failed, hsc_env, [])
833 { let this_mod = ms_mod mod
835 -- Add new info to hsc_env
836 hpt1 = extendModuleEnv (hsc_HPT hsc_env)
838 hsc_env1 = hsc_env { hsc_HPT = hpt1 }
840 -- Space-saving: delete the old HPT entry
841 -- for mod BUT if mod is a hs-boot
842 -- node, don't delete it. For the
843 -- interface, the HPT entry is probaby for the
844 -- main Haskell source file. Deleting it
845 -- would force .. (what?? --SDM)
846 old_hpt1 | isBootSummary mod = old_hpt
847 | otherwise = delModuleEnv old_hpt this_mod
849 ; (restOK, hsc_env2, modOKs)
850 <- upsweep hsc_env1 old_hpt1 stable_mods cleanup mods
851 ; return (restOK, hsc_env2, mod:modOKs)
855 -- Compile a single module. Always produce a Linkable for it if
856 -- successful. If no compilation happened, return the old Linkable.
857 upsweep_mod :: HscEnv
859 -> ([Module],[Module])
861 -> IO (Maybe HomeModInfo) -- Nothing => Failed
863 upsweep_mod hsc_env old_hpt (stable_obj, stable_bco) summary
866 this_mod = ms_mod summary
867 mb_obj_date = ms_obj_date summary
868 obj_fn = ml_obj_file (ms_location summary)
869 hs_date = ms_hs_date summary
871 compile_it :: Maybe Linkable -> IO (Maybe HomeModInfo)
872 compile_it = upsweep_compile hsc_env old_hpt this_mod summary
874 case ghcMode (hsc_dflags hsc_env) of
877 -- Batch-compilating is easy: just check whether we have
878 -- an up-to-date object file. If we do, then the compiler
879 -- needs to do a recompilation check.
880 _ | Just obj_date <- mb_obj_date, obj_date >= hs_date -> do
882 findObjectLinkable this_mod obj_fn obj_date
883 compile_it (Just linkable)
890 _ | is_stable_obj, isJust old_hmi ->
892 -- object is stable, and we have an entry in the
893 -- old HPT: nothing to do
895 | is_stable_obj, isNothing old_hmi -> do
897 findObjectLinkable this_mod obj_fn
898 (expectJust "upseep1" mb_obj_date)
899 compile_it (Just linkable)
900 -- object is stable, but we need to load the interface
901 -- off disk to make a HMI.
904 ASSERT(isJust old_hmi) -- must be in the old_hpt
906 -- BCO is stable: nothing to do
908 | Just hmi <- old_hmi,
909 Just l <- hm_linkable hmi, not (isObjectLinkable l),
910 linkableTime l >= ms_hs_date summary ->
912 -- we have an old BCO that is up to date with respect
913 -- to the source: do a recompilation check as normal.
917 -- no existing code at all: we must recompile.
919 is_stable_obj = this_mod `elem` stable_obj
920 is_stable_bco = this_mod `elem` stable_bco
922 old_hmi = lookupModuleEnv old_hpt this_mod
924 -- Run hsc to compile a module
925 upsweep_compile hsc_env old_hpt this_mod summary mb_old_linkable = do
927 -- The old interface is ok if it's in the old HPT
928 -- a) we're compiling a source file, and the old HPT
929 -- entry is for a source file
930 -- b) we're compiling a hs-boot file
931 -- Case (b) allows an hs-boot file to get the interface of its
932 -- real source file on the second iteration of the compilation
933 -- manager, but that does no harm. Otherwise the hs-boot file
934 -- will always be recompiled
937 = case lookupModuleEnv old_hpt this_mod of
939 Just hm_info | isBootSummary summary -> Just iface
940 | not (mi_boot iface) -> Just iface
941 | otherwise -> Nothing
943 iface = hm_iface hm_info
945 compresult <- compile hsc_env summary mb_old_linkable mb_old_iface
948 -- Compilation failed. Compile may still have updated the PCS, tho.
949 CompErrs -> return Nothing
951 -- Compilation "succeeded", and may or may not have returned a new
952 -- linkable (depending on whether compilation was actually performed
954 CompOK new_details new_iface new_linkable
955 -> do let new_info = HomeModInfo { hm_iface = new_iface,
956 hm_details = new_details,
957 hm_linkable = new_linkable }
958 return (Just new_info)
961 -- Filter modules in the HPT
962 retainInTopLevelEnvs :: [Module] -> HomePackageTable -> HomePackageTable
963 retainInTopLevelEnvs keep_these hpt
964 = mkModuleEnv [ (mod, expectJust "retain" mb_mod_info)
966 , let mb_mod_info = lookupModuleEnv hpt mod
967 , isJust mb_mod_info ]
969 -- ---------------------------------------------------------------------------
970 -- Topological sort of the module graph
973 :: Bool -- Drop hi-boot nodes? (see below)
977 -- Calculate SCCs of the module graph, possibly dropping the hi-boot nodes
978 -- The resulting list of strongly-connected-components is in topologically
979 -- sorted order, starting with the module(s) at the bottom of the
980 -- dependency graph (ie compile them first) and ending with the ones at
983 -- Drop hi-boot nodes (first boolean arg)?
985 -- False: treat the hi-boot summaries as nodes of the graph,
986 -- so the graph must be acyclic
988 -- True: eliminate the hi-boot nodes, and instead pretend
989 -- the a source-import of Foo is an import of Foo
990 -- The resulting graph has no hi-boot nodes, but can by cyclic
992 topSortModuleGraph drop_hs_boot_nodes summaries Nothing
993 = stronglyConnComp (fst (moduleGraphNodes drop_hs_boot_nodes summaries))
994 topSortModuleGraph drop_hs_boot_nodes summaries (Just mod)
995 = stronglyConnComp (map vertex_fn (reachable graph root))
997 -- restrict the graph to just those modules reachable from
998 -- the specified module. We do this by building a graph with
999 -- the full set of nodes, and determining the reachable set from
1000 -- the specified node.
1001 (nodes, lookup_key) = moduleGraphNodes drop_hs_boot_nodes summaries
1002 (graph, vertex_fn, key_fn) = graphFromEdges' nodes
1004 | Just key <- lookup_key HsSrcFile mod, Just v <- key_fn key = v
1005 | otherwise = throwDyn (ProgramError "module does not exist")
1007 moduleGraphNodes :: Bool -> [ModSummary]
1008 -> ([(ModSummary, Int, [Int])], HscSource -> Module -> Maybe Int)
1009 moduleGraphNodes drop_hs_boot_nodes summaries = (nodes, lookup_key)
1011 -- Drop hs-boot nodes by using HsSrcFile as the key
1012 hs_boot_key | drop_hs_boot_nodes = HsSrcFile
1013 | otherwise = HsBootFile
1015 -- We use integers as the keys for the SCC algorithm
1016 nodes :: [(ModSummary, Int, [Int])]
1017 nodes = [(s, expectJust "topSort" (lookup_key (ms_hsc_src s) (ms_mod s)),
1018 out_edge_keys hs_boot_key (ms_srcimps s) ++
1019 out_edge_keys HsSrcFile (ms_imps s) )
1021 , not (isBootSummary s && drop_hs_boot_nodes) ]
1022 -- Drop the hi-boot ones if told to do so
1024 key_map :: NodeMap Int
1025 key_map = listToFM ([(ms_mod s, ms_hsc_src s) | s <- summaries]
1028 lookup_key :: HscSource -> Module -> Maybe Int
1029 lookup_key hs_src mod = lookupFM key_map (mod, hs_src)
1031 out_edge_keys :: HscSource -> [Module] -> [Int]
1032 out_edge_keys hi_boot ms = mapCatMaybes (lookup_key hi_boot) ms
1033 -- If we want keep_hi_boot_nodes, then we do lookup_key with
1034 -- the IsBootInterface parameter True; else False
1037 type NodeKey = (Module, HscSource) -- The nodes of the graph are
1038 type NodeMap a = FiniteMap NodeKey a -- keyed by (mod, src_file_type) pairs
1040 msKey :: ModSummary -> NodeKey
1041 msKey (ModSummary { ms_mod = mod, ms_hsc_src = boot }) = (mod,boot)
1043 emptyNodeMap :: NodeMap a
1044 emptyNodeMap = emptyFM
1046 mkNodeMap :: [ModSummary] -> NodeMap ModSummary
1047 mkNodeMap summaries = listToFM [ (msKey s, s) | s <- summaries]
1049 nodeMapElts :: NodeMap a -> [a]
1050 nodeMapElts = eltsFM
1052 -- -----------------------------------------------------------------
1053 -- The unlinked image
1055 -- The compilation manager keeps a list of compiled, but as-yet unlinked
1056 -- binaries (byte code or object code). Even when it links bytecode
1057 -- it keeps the unlinked version so it can re-link it later without
1060 type UnlinkedImage = [Linkable] -- the unlinked images (should be a set, really)
1062 findModuleLinkable_maybe :: [Linkable] -> Module -> Maybe Linkable
1063 findModuleLinkable_maybe lis mod
1064 = case [LM time nm us | LM time nm us <- lis, nm == mod] of
1067 many -> pprPanic "findModuleLinkable" (ppr mod)
1069 delModuleLinkable :: [Linkable] -> Module -> [Linkable]
1070 delModuleLinkable ls mod = [ l | l@(LM _ nm _) <- ls, nm /= mod ]
1072 -----------------------------------------------------------------------------
1073 -- Downsweep (dependency analysis)
1075 -- Chase downwards from the specified root set, returning summaries
1076 -- for all home modules encountered. Only follow source-import
1079 -- We pass in the previous collection of summaries, which is used as a
1080 -- cache to avoid recalculating a module summary if the source is
1083 -- The returned list of [ModSummary] nodes has one node for each home-package
1084 -- module, plus one for any hs-boot files. The imports of these nodes
1085 -- are all there, including the imports of non-home-package modules.
1088 -> [ModSummary] -- Old summaries
1089 -> [Module] -- Ignore dependencies on these; treat them as
1090 -- if they were package modules
1092 downsweep hsc_env old_summaries excl_mods
1093 = do rootSummaries <- mapM getRootSummary roots
1094 checkDuplicates rootSummaries
1095 loop (concatMap msDeps rootSummaries)
1096 (mkNodeMap rootSummaries)
1098 roots = hsc_targets hsc_env
1100 old_summary_map :: NodeMap ModSummary
1101 old_summary_map = mkNodeMap old_summaries
1103 getRootSummary :: Target -> IO ModSummary
1104 getRootSummary (Target (TargetFile file) maybe_buf)
1105 = do exists <- doesFileExist file
1106 if exists then summariseFile hsc_env file maybe_buf else do
1107 throwDyn (CmdLineError ("can't find file: " ++ file))
1108 getRootSummary (Target (TargetModule modl) maybe_buf)
1109 = do maybe_summary <- summarise hsc_env emptyNodeMap Nothing False
1110 modl maybe_buf excl_mods
1111 case maybe_summary of
1112 Nothing -> packageModErr modl
1115 -- In a root module, the filename is allowed to diverge from the module
1116 -- name, so we have to check that there aren't multiple root files
1117 -- defining the same module (otherwise the duplicates will be silently
1118 -- ignored, leading to confusing behaviour).
1119 checkDuplicates :: [ModSummary] -> IO ()
1120 checkDuplicates summaries = mapM_ check summaries
1125 many -> multiRootsErr modl many
1126 where modl = ms_mod summ
1128 [ expectJust "checkDup" (ml_hs_file (ms_location summ'))
1129 | summ' <- summaries, ms_mod summ' == modl ]
1131 loop :: [(FilePath,Module,IsBootInterface)]
1132 -- Work list: process these modules
1133 -> NodeMap ModSummary
1136 -- The result includes the worklist, except
1137 -- for those mentioned in the visited set
1138 loop [] done = return (nodeMapElts done)
1139 loop ((cur_path, wanted_mod, is_boot) : ss) done
1140 | key `elemFM` done = loop ss done
1141 | otherwise = do { mb_s <- summarise hsc_env old_summary_map
1142 (Just cur_path) is_boot
1143 wanted_mod Nothing excl_mods
1145 Nothing -> loop ss done
1146 Just s -> loop (msDeps s ++ ss)
1147 (addToFM done key s) }
1149 key = (wanted_mod, if is_boot then HsBootFile else HsSrcFile)
1151 msDeps :: ModSummary -> [(FilePath, -- Importing module
1152 Module, -- Imported module
1153 IsBootInterface)] -- {-# SOURCE #-} import or not
1154 -- (msDeps s) returns the dependencies of the ModSummary s.
1155 -- A wrinkle is that for a {-# SOURCE #-} import we return
1156 -- *both* the hs-boot file
1157 -- *and* the source file
1158 -- as "dependencies". That ensures that the list of all relevant
1159 -- modules always contains B.hs if it contains B.hs-boot.
1160 -- Remember, this pass isn't doing the topological sort. It's
1161 -- just gathering the list of all relevant ModSummaries
1162 msDeps s = concat [ [(f, m, True), (f,m,False)] | m <- ms_srcimps s]
1163 ++ [(f,m,False) | m <- ms_imps s]
1165 f = msHsFilePath s -- Keep the importing module for error reporting
1168 -----------------------------------------------------------------------------
1169 -- Summarising modules
1171 -- We have two types of summarisation:
1173 -- * Summarise a file. This is used for the root module(s) passed to
1174 -- cmLoadModules. The file is read, and used to determine the root
1175 -- module name. The module name may differ from the filename.
1177 -- * Summarise a module. We are given a module name, and must provide
1178 -- a summary. The finder is used to locate the file in which the module
1181 summariseFile :: HscEnv -> FilePath
1182 -> Maybe (StringBuffer,ClockTime)
1184 -- Used for Haskell source only, I think
1185 -- We know the file name, and we know it exists,
1186 -- but we don't necessarily know the module name (might differ)
1187 summariseFile hsc_env file maybe_buf
1188 = do let dflags = hsc_dflags hsc_env
1190 (dflags', hspp_fn, buf)
1191 <- preprocessFile dflags file maybe_buf
1193 (srcimps,the_imps,mod) <- getImports dflags' buf hspp_fn
1195 -- Make a ModLocation for this file
1196 location <- mkHomeModLocation dflags mod file
1198 -- Tell the Finder cache where it is, so that subsequent calls
1199 -- to findModule will find it, even if it's not on any search path
1200 addHomeModuleToFinder hsc_env mod location
1202 src_timestamp <- case maybe_buf of
1203 Just (_,t) -> return t
1204 Nothing -> getModificationTime file
1206 obj_timestamp <- modificationTimeIfExists (ml_obj_file location)
1208 return (ModSummary { ms_mod = mod, ms_hsc_src = HsSrcFile,
1209 ms_location = location,
1210 ms_hspp_file = Just hspp_fn,
1211 ms_hspp_buf = Just buf,
1212 ms_srcimps = srcimps, ms_imps = the_imps,
1213 ms_hs_date = src_timestamp,
1214 ms_obj_date = obj_timestamp })
1216 -- Summarise a module, and pick up source and timestamp.
1218 -> NodeMap ModSummary -- Map of old summaries
1219 -> Maybe FilePath -- Importing module (for error messages)
1220 -> IsBootInterface -- True <=> a {-# SOURCE #-} import
1221 -> Module -- Imported module to be summarised
1222 -> Maybe (StringBuffer, ClockTime)
1223 -> [Module] -- Modules to exclude
1224 -> IO (Maybe ModSummary) -- Its new summary
1226 summarise hsc_env old_summary_map cur_mod is_boot wanted_mod maybe_buf excl_mods
1227 | wanted_mod `elem` excl_mods
1230 | Just old_summary <- lookupFM old_summary_map (wanted_mod, hsc_src)
1231 = do -- Find its new timestamp; all the
1232 -- ModSummaries in the old map have valid ml_hs_files
1233 let location = ms_location old_summary
1234 src_fn = expectJust "summarise" (ml_hs_file location)
1236 -- return the cached summary if the source didn't change
1237 src_timestamp <- case maybe_buf of
1238 Just (_,t) -> return t
1239 Nothing -> getModificationTime src_fn
1241 if ms_hs_date old_summary == src_timestamp
1242 then do -- update the object-file timestamp
1243 obj_timestamp <- getObjTimestamp location is_boot
1244 return (Just old_summary{ ms_obj_date = obj_timestamp })
1246 -- source changed: re-summarise
1247 new_summary location src_fn maybe_buf src_timestamp
1250 = do found <- findModule hsc_env wanted_mod True {-explicit-}
1253 | not (isHomePackage pkg) -> return Nothing
1254 -- Drop external-pkg
1255 | isJust (ml_hs_file location) -> just_found location
1257 err -> noModError dflags cur_mod wanted_mod err
1260 dflags = hsc_dflags hsc_env
1262 hsc_src = if is_boot then HsBootFile else HsSrcFile
1264 just_found location = do
1265 -- Adjust location to point to the hs-boot source file,
1266 -- hi file, object file, when is_boot says so
1267 let location' | is_boot = addBootSuffixLocn location
1268 | otherwise = location
1269 src_fn = expectJust "summarise2" (ml_hs_file location')
1271 -- Check that it exists
1272 -- It might have been deleted since the Finder last found it
1273 maybe_t <- modificationTimeIfExists src_fn
1275 Nothing -> noHsFileErr cur_mod src_fn
1276 Just t -> new_summary location' src_fn Nothing t
1279 new_summary location src_fn maybe_bug src_timestamp
1281 -- Preprocess the source file and get its imports
1282 -- The dflags' contains the OPTIONS pragmas
1283 (dflags', hspp_fn, buf) <- preprocessFile dflags src_fn maybe_buf
1284 (srcimps, the_imps, mod_name) <- getImports dflags' buf hspp_fn
1286 when (mod_name /= wanted_mod) $
1287 throwDyn (ProgramError
1288 (showSDoc (text src_fn
1289 <> text ": file name does not match module name"
1290 <+> quotes (ppr mod_name))))
1292 -- Find the object timestamp, and return the summary
1293 obj_timestamp <- getObjTimestamp location is_boot
1295 return (Just ( ModSummary { ms_mod = wanted_mod,
1296 ms_hsc_src = hsc_src,
1297 ms_location = location,
1298 ms_hspp_file = Just hspp_fn,
1299 ms_hspp_buf = Just buf,
1300 ms_srcimps = srcimps,
1302 ms_hs_date = src_timestamp,
1303 ms_obj_date = obj_timestamp }))
1306 getObjTimestamp location is_boot
1307 = if is_boot then return Nothing
1308 else modificationTimeIfExists (ml_obj_file location)
1311 preprocessFile :: DynFlags -> FilePath -> Maybe (StringBuffer,ClockTime)
1312 -> IO (DynFlags, FilePath, StringBuffer)
1313 preprocessFile dflags src_fn Nothing
1315 (dflags', hspp_fn) <- preprocess dflags src_fn
1316 buf <- hGetStringBuffer hspp_fn
1317 return (dflags', hspp_fn, buf)
1319 preprocessFile dflags src_fn (Just (buf, time))
1321 -- case we bypass the preprocessing stage?
1323 local_opts = getOptionsFromStringBuffer buf
1325 (dflags', errs) <- parseDynamicFlags dflags local_opts
1329 | Unlit _ <- startPhase src_fn = True
1330 -- note: local_opts is only required if there's no Unlit phase
1331 | dopt Opt_Cpp dflags' = True
1332 | dopt Opt_Pp dflags' = True
1335 when needs_preprocessing $
1336 ghcError (ProgramError "buffer needs preprocesing; interactive check disabled")
1338 return (dflags', "<buffer>", buf)
1341 -----------------------------------------------------------------------------
1343 -----------------------------------------------------------------------------
1345 noModError :: DynFlags -> Maybe FilePath -> Module -> FindResult -> IO ab
1346 -- ToDo: we don't have a proper line number for this error
1347 noModError dflags cur_mod wanted_mod err
1348 = throwDyn $ ProgramError $ showSDoc $
1349 vcat [cantFindError dflags wanted_mod err,
1350 nest 2 (parens (pp_where cur_mod))]
1352 noHsFileErr cur_mod path
1353 = throwDyn $ CmdLineError $ showSDoc $
1354 vcat [text "Can't find" <+> text path,
1355 nest 2 (parens (pp_where cur_mod))]
1357 pp_where Nothing = text "one of the roots of the dependency analysis"
1358 pp_where (Just p) = text "imported from" <+> text p
1361 = throwDyn (CmdLineError (showSDoc (text "module" <+>
1362 quotes (ppr mod) <+>
1363 text "is a package module")))
1365 multiRootsErr mod files
1366 = throwDyn (ProgramError (showSDoc (
1367 text "module" <+> quotes (ppr mod) <+>
1368 text "is defined in multiple files:" <+>
1369 sep (map text files))))
1371 cyclicModuleErr :: [ModSummary] -> SDoc
1373 = hang (ptext SLIT("Module imports form a cycle for modules:"))
1374 2 (vcat (map show_one ms))
1376 show_one ms = sep [ show_mod (ms_hsc_src ms) (ms_mod ms),
1377 nest 2 $ ptext SLIT("imports:") <+>
1378 (pp_imps HsBootFile (ms_srcimps ms)
1379 $$ pp_imps HsSrcFile (ms_imps ms))]
1380 show_mod hsc_src mod = ppr mod <> text (hscSourceString hsc_src)
1381 pp_imps src mods = fsep (map (show_mod src) mods)
1384 -- | Inform GHC that the working directory has changed. GHC will flush
1385 -- its cache of module locations, since it may no longer be valid.
1386 -- Note: if you change the working directory, you should also unload
1387 -- the current program (set targets to empty, followed by load).
1388 workingDirectoryChanged :: Session -> IO ()
1389 workingDirectoryChanged s = withSession s $ \hsc_env ->
1390 flushFinderCache (hsc_FC hsc_env)
1392 -- -----------------------------------------------------------------------------
1393 -- inspecting the session
1395 -- | Get the module dependency graph.
1396 getModuleGraph :: Session -> IO ModuleGraph -- ToDo: DiGraph ModSummary
1397 getModuleGraph s = withSession s (return . hsc_mod_graph)
1399 isLoaded :: Session -> Module -> IO Bool
1400 isLoaded s m = withSession s $ \hsc_env ->
1401 return $! isJust (lookupModuleEnv (hsc_HPT hsc_env) m)
1403 getBindings :: Session -> IO [TyThing]
1404 getBindings s = withSession s (return . nameEnvElts . ic_type_env . hsc_IC)
1406 getPrintUnqual :: Session -> IO PrintUnqualified
1407 getPrintUnqual s = withSession s (return . icPrintUnqual . hsc_IC)
1410 getModuleInfo :: Session -> Module -> IO ModuleInfo
1414 | BinaryCode FilePath
1416 data ModuleInfo = ModuleInfo {
1417 lm_modulename :: Module,
1418 lm_summary :: ModSummary,
1419 lm_interface :: ModIface,
1420 lm_tc_code :: Maybe TypecheckedCode,
1421 lm_rn_code :: Maybe RenamedCode,
1422 lm_obj :: Maybe ObjectCode
1425 type TypecheckedCode = HsTypecheckedGroup
1426 type RenamedCode = [HsGroup Name]
1428 -- ToDo: typechecks abstract syntax or renamed abstract syntax. Issues:
1429 -- - typechecked syntax includes extra dictionary translation and
1430 -- AbsBinds which need to be translated back into something closer to
1431 -- the original source.
1432 -- - renamed syntax currently doesn't exist in a single blob, since
1433 -- renaming and typechecking are interleaved at splice points. We'd
1434 -- need a restriction that there are no splices in the source module.
1437 -- - Data and Typeable instances for HsSyn.
1440 -- - things that aren't in the output of the renamer:
1441 -- - the export list
1445 -- - things that aren't in the output of the typechecker right now:
1446 -- - the export list
1448 -- - type signatures
1449 -- - type/data/newtype declarations
1450 -- - class declarations
1452 -- - extra things in the typechecker's output:
1453 -- - default methods are turned into top-level decls.
1454 -- - dictionary bindings
1456 -- ToDo: check for small transformations that happen to the syntax in
1457 -- the typechecker (eg. -e ==> negate e, perhaps for fromIntegral)
1459 -- ToDo: maybe use TH syntax instead of IfaceSyn? There's already a way
1460 -- to get from TyCons, Ids etc. to TH syntax (reify).
1462 -- :browse will use either lm_toplev or inspect lm_interface, depending
1463 -- on whether the module is interpreted or not.
1465 -- various abstract syntax types (perhaps IfaceBlah)
1469 -- This is for reconstructing refactored source code
1470 -- Calls the lexer repeatedly.
1471 -- ToDo: add comment tokens to token stream
1472 getTokenStream :: Session -> Module -> IO [Located Token]
1475 -- -----------------------------------------------------------------------------
1476 -- Interactive evaluation
1480 -- | Set the interactive evaluation context.
1482 -- Setting the context doesn't throw away any bindings; the bindings
1483 -- we've built up in the InteractiveContext simply move to the new
1484 -- module. They always shadow anything in scope in the current context.
1485 setContext :: Session
1486 -> [Module] -- entire top level scope of these modules
1487 -> [Module] -- exports only of these modules
1489 setContext (Session ref) toplevs exports = do
1490 hsc_env <- readIORef ref
1491 let old_ic = hsc_IC hsc_env
1492 hpt = hsc_HPT hsc_env
1494 mapM_ (checkModuleExists hsc_env hpt) exports
1495 export_env <- mkExportEnv hsc_env exports
1496 toplev_envs <- mapM (mkTopLevEnv hpt) toplevs
1497 let all_env = foldr plusGlobalRdrEnv export_env toplev_envs
1498 writeIORef ref hsc_env{ hsc_IC = old_ic { ic_toplev_scope = toplevs,
1499 ic_exports = exports,
1500 ic_rn_gbl_env = all_env } }
1502 checkModuleExists :: HscEnv -> HomePackageTable -> Module -> IO ()
1503 checkModuleExists hsc_env hpt mod =
1504 case lookupModuleEnv hpt mod of
1505 Just mod_info -> return ()
1506 _not_a_home_module -> do
1507 res <- findPackageModule hsc_env mod True
1509 Found _ _ -> return ()
1510 err -> let msg = cantFindError (hsc_dflags hsc_env) mod err in
1511 throwDyn (CmdLineError (showSDoc msg))
1513 mkTopLevEnv :: HomePackageTable -> Module -> IO GlobalRdrEnv
1514 mkTopLevEnv hpt modl
1515 = case lookupModuleEnv hpt modl of
1517 throwDyn (ProgramError ("mkTopLevEnv: not a home module "
1518 ++ showSDoc (pprModule modl)))
1520 case mi_globals (hm_iface details) of
1522 throwDyn (ProgramError ("mkTopLevEnv: not interpreted "
1523 ++ showSDoc (pprModule modl)))
1524 Just env -> return env
1526 -- | Get the interactive evaluation context, consisting of a pair of the
1527 -- set of modules from which we take the full top-level scope, and the set
1528 -- of modules from which we take just the exports respectively.
1529 getContext :: Session -> IO ([Module],[Module])
1530 getContext s = withSession s (\HscEnv{ hsc_IC=ic } ->
1531 return (ic_toplev_scope ic, ic_exports ic))
1533 -- | Returns 'True' if the specified module is interpreted, and hence has
1534 -- its full top-level scope available.
1535 moduleIsInterpreted :: Session -> Module -> IO Bool
1536 moduleIsInterpreted s modl = withSession s $ \h ->
1537 case lookupModuleEnv (hsc_HPT h) modl of
1538 Just details -> return (isJust (mi_globals (hm_iface details)))
1539 _not_a_home_module -> return False
1541 -- | Looks up an identifier in the current interactive context (for :info)
1542 getInfo :: Session -> String -> IO [GetInfoResult]
1543 getInfo s id = withSession s $ \hsc_env -> hscGetInfo hsc_env id
1545 -- -----------------------------------------------------------------------------
1546 -- Getting the type of an expression
1548 -- | Get the type of an expression
1549 exprType :: Session -> String -> IO (Maybe Type)
1550 exprType s expr = withSession s $ \hsc_env -> do
1551 maybe_stuff <- hscTcExpr hsc_env expr
1553 Nothing -> return Nothing
1554 Just ty -> return (Just tidy_ty)
1556 tidy_ty = tidyType emptyTidyEnv ty
1557 dflags = hsc_dflags hsc_env
1559 -- -----------------------------------------------------------------------------
1560 -- Getting the kind of a type
1562 -- | Get the kind of a type
1563 typeKind :: Session -> String -> IO (Maybe Kind)
1564 typeKind s str = withSession s $ \hsc_env -> do
1565 maybe_stuff <- hscKcType hsc_env str
1567 Nothing -> return Nothing
1568 Just kind -> return (Just kind)
1570 -----------------------------------------------------------------------------
1571 -- lookupName: returns the TyThing for a Name in the interactive context.
1572 -- ToDo: should look it up in the full environment
1574 lookupName :: Session -> Name -> IO (Maybe TyThing)
1575 lookupName s name = withSession s $ \hsc_env -> do
1576 return $! lookupNameEnv (ic_type_env (hsc_IC hsc_env)) name
1578 -----------------------------------------------------------------------------
1579 -- cmCompileExpr: compile an expression and deliver an HValue
1581 compileExpr :: Session -> String -> IO (Maybe HValue)
1582 compileExpr s expr = withSession s $ \hsc_env -> do
1583 maybe_stuff <- hscStmt hsc_env ("let __cmCompileExpr = "++expr)
1585 Nothing -> return Nothing
1586 Just (new_ic, names, hval) -> do
1588 hvals <- (unsafeCoerce# hval) :: IO [HValue]
1590 case (names,hvals) of
1591 ([n],[hv]) -> return (Just hv)
1592 _ -> panic "compileExpr"
1594 -- -----------------------------------------------------------------------------
1595 -- running a statement interactively
1598 = RunOk [Name] -- ^ names bound by this evaluation
1599 | RunFailed -- ^ statement failed compilation
1600 | RunException Exception -- ^ statement raised an exception
1602 -- | Run a statement in the current interactive context. Statemenet
1603 -- may bind multple values.
1604 runStmt :: Session -> String -> IO RunResult
1605 runStmt (Session ref) expr
1607 hsc_env <- readIORef ref
1609 -- Turn off -fwarn-unused-bindings when running a statement, to hide
1610 -- warnings about the implicit bindings we introduce.
1611 let dflags' = dopt_unset (hsc_dflags hsc_env) Opt_WarnUnusedBinds
1612 hsc_env' = hsc_env{ hsc_dflags = dflags' }
1614 maybe_stuff <- hscStmt hsc_env' expr
1617 Nothing -> return RunFailed
1618 Just (new_hsc_env, names, hval) -> do
1620 let thing_to_run = unsafeCoerce# hval :: IO [HValue]
1621 either_hvals <- sandboxIO thing_to_run
1623 case either_hvals of
1625 -- on error, keep the *old* interactive context,
1626 -- so that 'it' is not bound to something
1627 -- that doesn't exist.
1628 return (RunException e)
1631 -- Get the newly bound things, and bind them.
1632 -- Don't need to delete any shadowed bindings;
1633 -- the new ones override the old ones.
1634 extendLinkEnv (zip names hvals)
1636 writeIORef ref new_hsc_env
1637 return (RunOk names)
1640 -- We run the statement in a "sandbox" to protect the rest of the
1641 -- system from anything the expression might do. For now, this
1642 -- consists of just wrapping it in an exception handler, but see below
1643 -- for another version.
1645 sandboxIO :: IO a -> IO (Either Exception a)
1646 sandboxIO thing = Exception.try thing
1649 -- This version of sandboxIO runs the expression in a completely new
1650 -- RTS main thread. It is disabled for now because ^C exceptions
1651 -- won't be delivered to the new thread, instead they'll be delivered
1652 -- to the (blocked) GHCi main thread.
1654 -- SLPJ: when re-enabling this, reflect a wrong-stat error as an exception
1656 sandboxIO :: IO a -> IO (Either Int (Either Exception a))
1657 sandboxIO thing = do
1658 st_thing <- newStablePtr (Exception.try thing)
1659 alloca $ \ p_st_result -> do
1660 stat <- rts_evalStableIO st_thing p_st_result
1661 freeStablePtr st_thing
1663 then do st_result <- peek p_st_result
1664 result <- deRefStablePtr st_result
1665 freeStablePtr st_result
1666 return (Right result)
1668 return (Left (fromIntegral stat))
1670 foreign import "rts_evalStableIO" {- safe -}
1671 rts_evalStableIO :: StablePtr (IO a) -> Ptr (StablePtr a) -> IO CInt
1672 -- more informative than the C type!
1675 -- ---------------------------------------------------------------------------
1676 -- cmBrowseModule: get all the TyThings defined in a module
1678 browseModule :: Session -> Module -> Bool -> IO [IfaceDecl]
1679 browseModule s modl exports_only = withSession s $ \hsc_env -> do
1680 mb_decls <- getModuleContents hsc_env modl exports_only
1682 Nothing -> return [] -- An error of some kind
1683 Just ds -> return ds
1686 -----------------------------------------------------------------------------
1687 -- show a module and it's source/object filenames
1689 showModule :: Session -> ModSummary -> IO String
1690 showModule s mod_summary = withSession s $ \hsc_env -> do
1691 case lookupModuleEnv (hsc_HPT hsc_env) (ms_mod mod_summary) of
1692 Nothing -> panic "missing linkable"
1693 Just mod_info -> return (showModMsg obj_linkable mod_summary)
1695 obj_linkable = isObjectLinkable (fromJust (hm_linkable mod_info))