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:
79 * return error messages rather than printing them.
80 * inline bits of HscMain here to simplify layering: hscGetInfo,
82 * implement second argument to load.
83 * we need to expose DynFlags, so should parseDynamicFlags really be
84 part of this interface?
85 * what StaticFlags should we expose, if any?
88 #include "HsVersions.h"
91 import qualified Linker
92 import Linker ( HValue, extendLinkEnv )
93 import NameEnv ( lookupNameEnv )
94 import TcRnDriver ( mkExportEnv, getModuleContents )
95 import RdrName ( plusGlobalRdrEnv )
96 import HscMain ( hscGetInfo, GetInfoResult,
97 hscStmt, hscTcExpr, hscKcType )
98 import Type ( tidyType )
99 import VarEnv ( emptyTidyEnv )
100 import GHC.Exts ( unsafeCoerce# )
101 import IfaceSyn ( IfaceDecl )
104 import RdrName ( GlobalRdrEnv )
105 import HsSyn ( HsModule, LHsBinds )
106 import Type ( Kind, Type, dropForAlls )
107 import Id ( Id, idType )
108 import TyCon ( TyCon )
109 import Class ( Class )
110 import DataCon ( DataCon )
112 import RdrName ( RdrName )
113 import NameEnv ( nameEnvElts )
114 import SrcLoc ( Located )
115 import DriverPipeline
116 import DriverPhases ( Phase(..), isHaskellSrcFilename, startPhase )
117 import GetImports ( getImports )
118 import Packages ( isHomePackage )
120 import HscMain ( newHscEnv, hscFileCheck, HscResult(..) )
124 import SysTools ( initSysTools, cleanTempFiles )
129 import ErrUtils ( showPass, Messages, putMsg, debugTraceMsg )
130 import qualified ErrUtils
132 import StringBuffer ( StringBuffer, hGetStringBuffer )
134 import SysTools ( cleanTempFilesExcept )
135 import BasicTypes ( SuccessFlag(..), succeeded, failed )
136 import Maybes ( orElse, expectJust, mapCatMaybes )
138 import Directory ( getModificationTime, doesFileExist )
139 import Maybe ( isJust, isNothing, fromJust )
140 import Maybes ( expectJust )
141 import List ( partition, nub )
142 import qualified List
143 import Monad ( unless, when, foldM )
144 import System ( exitWith, ExitCode(..) )
145 import Time ( ClockTime )
146 import EXCEPTION as Exception hiding (handle)
149 import Prelude hiding (init)
151 -- -----------------------------------------------------------------------------
152 -- Exception handlers
154 -- | Install some default exception handlers and run the inner computation.
155 -- Unless you want to handle exceptions yourself, you should wrap this around
156 -- the top level of your program. The default handlers output the error
157 -- message(s) to stderr and exit cleanly.
158 defaultErrorHandler :: IO a -> IO a
159 defaultErrorHandler inner =
160 -- top-level exception handler: any unrecognised exception is a compiler bug.
161 handle (\exception -> do
164 -- an IO exception probably isn't our fault, so don't panic
165 IOException _ -> putMsg (show exception)
166 AsyncException StackOverflow ->
167 putMsg "stack overflow: use +RTS -K<size> to increase it"
168 _other -> putMsg (show (Panic (show exception)))
169 exitWith (ExitFailure 1)
172 -- all error messages are propagated as exceptions
173 handleDyn (\dyn -> do
176 PhaseFailed _ code -> exitWith code
177 Interrupted -> exitWith (ExitFailure 1)
178 _ -> do putMsg (show (dyn :: GhcException))
179 exitWith (ExitFailure 1)
183 -- | Install a default cleanup handler to remove temporary files
184 -- deposited by a GHC run. This is seperate from
185 -- 'defaultErrorHandler', because you might want to override the error
186 -- handling, but still get the ordinary cleanup behaviour.
187 defaultCleanupHandler :: DynFlags -> IO a -> IO a
188 defaultCleanupHandler dflags inner =
189 -- make sure we clean up after ourselves
190 later (unless (dopt Opt_KeepTmpFiles dflags) $
191 cleanTempFiles dflags)
192 -- exceptions will be blocked while we clean the temporary files,
193 -- so there shouldn't be any difficulty if we receive further
198 -- | Initialises GHC. This must be done /once/ only. Takes the
199 -- command-line arguments. All command-line arguments which aren't
200 -- understood by GHC will be returned.
202 init :: [String] -> IO [String]
205 installSignalHandlers
207 -- Grab the -B option if there is one
208 let (minusB_args, argv1) = partition (prefixMatch "-B") args
209 dflags0 <- initSysTools minusB_args defaultDynFlags
210 writeIORef v_initDynFlags dflags0
212 -- Parse the static flags
213 argv2 <- parseStaticFlags argv1
216 GLOBAL_VAR(v_initDynFlags, error "initDynFlags", DynFlags)
217 -- stores the DynFlags between the call to init and subsequent
218 -- calls to newSession.
220 -- | Starts a new session. A session consists of a set of loaded
221 -- modules, a set of options (DynFlags), and an interactive context.
222 -- ToDo: GhcMode should say "keep typechecked code" and\/or "keep renamed
224 newSession :: GhcMode -> IO Session
226 dflags0 <- readIORef v_initDynFlags
227 dflags <- initDynFlags dflags0
228 env <- newHscEnv dflags{ ghcMode=mode }
232 -- tmp: this breaks the abstraction, but required because DriverMkDepend
233 -- needs to call the Finder. ToDo: untangle this.
234 sessionHscEnv :: Session -> IO HscEnv
235 sessionHscEnv (Session ref) = readIORef ref
237 withSession :: Session -> (HscEnv -> IO a) -> IO a
238 withSession (Session ref) f = do h <- readIORef ref; f h
240 modifySession :: Session -> (HscEnv -> HscEnv) -> IO ()
241 modifySession (Session ref) f = do h <- readIORef ref; writeIORef ref $! f h
243 -- -----------------------------------------------------------------------------
246 -- | Grabs the DynFlags from the Session
247 getSessionDynFlags :: Session -> IO DynFlags
248 getSessionDynFlags s = withSession s (return . hsc_dflags)
250 -- | Updates the DynFlags in a Session
251 setSessionDynFlags :: Session -> DynFlags -> IO ()
252 setSessionDynFlags s dflags = modifySession s (\h -> h{ hsc_dflags = dflags })
254 -- | Messages during compilation (eg. warnings and progress messages)
255 -- are reported using this callback. By default, these messages are
256 -- printed to stderr.
257 setMsgHandler :: (String -> IO ()) -> IO ()
258 setMsgHandler = ErrUtils.setMsgHandler
260 -- -----------------------------------------------------------------------------
263 -- ToDo: think about relative vs. absolute file paths. And what
264 -- happens when the current directory changes.
266 -- | Sets the targets for this session. Each target may be a module name
267 -- or a filename. The targets correspond to the set of root modules for
268 -- the program\/library. Unloading the current program is achieved by
269 -- setting the current set of targets to be empty, followed by load.
270 setTargets :: Session -> [Target] -> IO ()
271 setTargets s targets = modifySession s (\h -> h{ hsc_targets = targets })
273 -- | returns the current set of targets
274 getTargets :: Session -> IO [Target]
275 getTargets s = withSession s (return . hsc_targets)
277 -- | Add another target
278 addTarget :: Session -> Target -> IO ()
280 = modifySession s (\h -> h{ hsc_targets = target : hsc_targets h })
283 removeTarget :: Session -> TargetId -> IO ()
284 removeTarget s target_id
285 = modifySession s (\h -> h{ hsc_targets = filter (hsc_targets h) })
287 filter targets = [ t | t@(Target id _) <- targets, id /= target_id ]
289 -- Attempts to guess what Target a string refers to. This function implements
290 -- the --make/GHCi command-line syntax for filenames:
292 -- - if the string looks like a Haskell source filename, then interpret
294 -- - if adding a .hs or .lhs suffix yields the name of an existing file,
296 -- - otherwise interpret the string as a module name
298 guessTarget :: String -> IO Target
300 | isHaskellSrcFilename file
301 = return (Target (TargetFile file) Nothing)
303 = do exists <- doesFileExist hs_file
304 if exists then return (Target (TargetFile hs_file) Nothing) else do
305 exists <- doesFileExist lhs_file
306 if exists then return (Target (TargetFile lhs_file) Nothing) else do
307 return (Target (TargetModule (mkModule file)) Nothing)
309 hs_file = file ++ ".hs"
310 lhs_file = file ++ ".lhs"
312 -- -----------------------------------------------------------------------------
313 -- Loading the program
315 -- Perform a dependency analysis starting from the current targets
316 -- and update the session with the new module graph.
317 depanal :: Session -> [Module] -> IO ()
318 depanal (Session ref) excluded_mods = do
319 hsc_env <- readIORef ref
321 dflags = hsc_dflags hsc_env
322 gmode = ghcMode (hsc_dflags hsc_env)
323 targets = hsc_targets hsc_env
324 old_graph = hsc_mod_graph hsc_env
326 showPass dflags "Chasing dependencies"
327 when (gmode == BatchCompile) $
328 debugTraceMsg dflags 1 (showSDoc (hcat [
329 text "Chasing modules from: ",
330 hcat (punctuate comma (map pprTarget targets))]))
332 graph <- downsweep hsc_env old_graph excluded_mods
333 writeIORef ref hsc_env{ hsc_mod_graph=graph }
336 -- | The result of load.
338 = LoadOk Errors -- ^ all specified targets were loaded successfully.
339 | LoadFailed Errors -- ^ not all modules were loaded.
341 type Errors = [String]
343 data ErrMsg = ErrMsg {
344 errMsgSeverity :: Severity, -- warning, error, etc.
345 errMsgSpans :: [SrcSpan],
346 errMsgShortDoc :: Doc,
347 errMsgExtraInfo :: Doc
354 | LoadDependenciesOf Module
356 -- | Try to load the program. If a Module is supplied, then just
357 -- attempt to load up to this target. If no Module is supplied,
358 -- then try to load all targets.
359 load :: Session -> LoadHowMuch -> IO SuccessFlag
360 load s@(Session ref) how_much
362 -- Dependency analysis first. Note that this fixes the module graph:
363 -- even if we don't get a fully successful upsweep, the full module
364 -- graph is still retained in the Session. We can tell which modules
365 -- were successfully loaded by inspecting the Session's HPT.
368 hsc_env <- readIORef ref
370 let hpt1 = hsc_HPT hsc_env
371 let dflags = hsc_dflags hsc_env
372 let mod_graph = hsc_mod_graph hsc_env
374 let ghci_mode = ghcMode (hsc_dflags hsc_env) -- this never changes
375 let verb = verbosity dflags
377 -- The "bad" boot modules are the ones for which we have
378 -- B.hs-boot in the module graph, but no B.hs
379 -- The downsweep should have ensured this does not happen
381 let all_home_mods = [ms_mod s | s <- mod_graph, not (isBootSummary s)]
382 bad_boot_mods = [s | s <- mod_graph, isBootSummary s,
383 not (ms_mod s `elem` all_home_mods)]
384 ASSERT( null bad_boot_mods ) return ()
386 -- mg2_with_srcimps drops the hi-boot nodes, returning a
387 -- graph with cycles. Among other things, it is used for
388 -- backing out partially complete cycles following a failed
389 -- upsweep, and for removing from hpt all the modules
390 -- not in strict downwards closure, during calls to compile.
391 let mg2_with_srcimps :: [SCC ModSummary]
392 mg2_with_srcimps = topSortModuleGraph True mod_graph Nothing
394 -- check the stability property for each module.
395 stable_mods@(stable_obj,stable_bco)
396 | BatchCompile <- ghci_mode = ([],[])
397 | otherwise = checkStability hpt1 mg2_with_srcimps all_home_mods
399 -- prune bits of the HPT which are definitely redundant now,
401 pruned_hpt = pruneHomePackageTable hpt1
402 (flattenSCCs mg2_with_srcimps)
407 debugTraceMsg dflags 2 (showSDoc (text "Stable obj:" <+> ppr stable_obj $$
408 text "Stable BCO:" <+> ppr stable_bco))
410 -- Unload any modules which are going to be re-linked this time around.
411 let stable_linkables = [ linkable
412 | m <- stable_obj++stable_bco,
413 Just hmi <- [lookupModuleEnv pruned_hpt m],
414 Just linkable <- [hm_linkable hmi] ]
415 unload hsc_env stable_linkables
417 -- We could at this point detect cycles which aren't broken by
418 -- a source-import, and complain immediately, but it seems better
419 -- to let upsweep_mods do this, so at least some useful work gets
420 -- done before the upsweep is abandoned.
421 --hPutStrLn stderr "after tsort:\n"
422 --hPutStrLn stderr (showSDoc (vcat (map ppr mg2)))
424 -- Now do the upsweep, calling compile for each module in
425 -- turn. Final result is version 3 of everything.
427 -- Topologically sort the module graph, this time including hi-boot
428 -- nodes, and possibly just including the portion of the graph
429 -- reachable from the module specified in the 2nd argument to load.
430 -- This graph should be cycle-free.
431 -- If we're restricting the upsweep to a portion of the graph, we
432 -- also want to retain everything that is still stable.
433 let full_mg :: [SCC ModSummary]
434 full_mg = topSortModuleGraph False mod_graph Nothing
436 maybe_top_mod = case how_much of
438 LoadDependenciesOf m -> Just m
441 partial_mg0 :: [SCC ModSummary]
442 partial_mg0 = topSortModuleGraph False mod_graph maybe_top_mod
444 -- LoadDependenciesOf m: we want the upsweep to stop just
445 -- short of the specified module (unless the specified module
448 | LoadDependenciesOf mod <- how_much
449 = ASSERT( case last partial_mg0 of
450 AcyclicSCC ms -> ms_mod ms == mod; _ -> False )
451 List.init partial_mg0
457 | AcyclicSCC ms <- full_mg,
458 ms_mod ms `elem` stable_obj++stable_bco,
459 ms_mod ms `notElem` [ ms_mod ms' |
460 AcyclicSCC ms' <- partial_mg ] ]
462 mg = stable_mg ++ partial_mg
464 -- clean up between compilations
465 let cleanup = cleanTempFilesExcept dflags
466 (ppFilesFromSummaries (flattenSCCs mg2_with_srcimps))
468 (upsweep_ok, hsc_env1, modsUpswept)
469 <- upsweep (hsc_env { hsc_HPT = emptyHomePackageTable })
470 pruned_hpt stable_mods cleanup mg
472 -- Make modsDone be the summaries for each home module now
473 -- available; this should equal the domain of hpt3.
474 -- Get in in a roughly top .. bottom order (hence reverse).
476 let modsDone = reverse modsUpswept
478 -- Try and do linking in some form, depending on whether the
479 -- upsweep was completely or only partially successful.
481 if succeeded upsweep_ok
484 -- Easy; just relink it all.
485 do debugTraceMsg dflags 2 "Upsweep completely successful."
487 -- Clean up after ourselves
488 cleanTempFilesExcept dflags (ppFilesFromSummaries modsDone)
490 -- Issue a warning for the confusing case where the user
491 -- said '-o foo' but we're not going to do any linking.
492 -- We attempt linking if either (a) one of the modules is
493 -- called Main, or (b) the user said -no-hs-main, indicating
494 -- that main() is going to come from somewhere else.
496 let ofile = outputFile dflags
497 let no_hs_main = dopt Opt_NoHsMain dflags
498 let mb_main_mod = mainModIs dflags
500 main_mod = mb_main_mod `orElse` "Main"
502 = any ((==main_mod).moduleUserString.ms_mod)
504 do_linking = a_root_is_Main || no_hs_main
506 when (ghci_mode == BatchCompile && isJust ofile && not do_linking) $
507 debugTraceMsg dflags 1 ("Warning: output was redirected with -o, " ++
508 "but no output will be generated\n" ++
509 "because there is no " ++ main_mod ++ " module.")
511 -- link everything together
512 linkresult <- link ghci_mode dflags do_linking (hsc_HPT hsc_env1)
514 loadFinish Succeeded linkresult ref hsc_env1
517 -- Tricky. We need to back out the effects of compiling any
518 -- half-done cycles, both so as to clean up the top level envs
519 -- and to avoid telling the interactive linker to link them.
520 do debugTraceMsg dflags 2 "Upsweep partially successful."
523 = map ms_mod modsDone
524 let mods_to_zap_names
525 = findPartiallyCompletedCycles modsDone_names
528 = filter ((`notElem` mods_to_zap_names).ms_mod)
531 let hpt4 = retainInTopLevelEnvs (map ms_mod mods_to_keep)
534 -- Clean up after ourselves
535 cleanTempFilesExcept dflags (ppFilesFromSummaries mods_to_keep)
537 -- there should be no Nothings where linkables should be, now
538 ASSERT(all (isJust.hm_linkable)
539 (moduleEnvElts (hsc_HPT hsc_env))) do
541 -- Link everything together
542 linkresult <- link ghci_mode dflags False hpt4
544 let hsc_env4 = hsc_env1{ hsc_HPT = hpt4 }
545 loadFinish Failed linkresult ref hsc_env4
547 -- Finish up after a load.
549 -- If the link failed, unload everything and return.
550 loadFinish all_ok Failed ref hsc_env
551 = do unload hsc_env []
552 writeIORef ref $! discardProg hsc_env
555 -- Empty the interactive context and set the module context to the topmost
556 -- newly loaded module, or the Prelude if none were loaded.
557 loadFinish all_ok Succeeded ref hsc_env
558 = do writeIORef ref $! hsc_env{ hsc_IC = emptyInteractiveContext }
562 -- Forget the current program, but retain the persistent info in HscEnv
563 discardProg :: HscEnv -> HscEnv
565 = hsc_env { hsc_mod_graph = emptyMG,
566 hsc_IC = emptyInteractiveContext,
567 hsc_HPT = emptyHomePackageTable }
569 -- used to fish out the preprocess output files for the purposes of
570 -- cleaning up. The preprocessed file *might* be the same as the
571 -- source file, but that doesn't do any harm.
572 ppFilesFromSummaries summaries = [ fn | Just fn <- map ms_hspp_file summaries ]
574 -- -----------------------------------------------------------------------------
578 CheckedModule { parsedSource :: ParsedSource,
579 typecheckedSource :: Maybe TypecheckedSource
582 type ParsedSource = Located (HsModule RdrName)
583 type TypecheckedSource = (LHsBinds Id, GlobalRdrEnv)
585 -- | This is the way to get access to parsed and typechecked source code
586 -- for a module. 'checkModule' loads all the dependencies of the specified
587 -- module in the Session, and then attempts to typecheck the module. If
588 -- successful, it returns the abstract syntax for the module.
589 checkModule :: Session -> Module -> (Messages -> IO ())
590 -> IO (Maybe CheckedModule)
591 checkModule session@(Session ref) mod msg_act = do
592 -- load up the dependencies first
593 r <- load session (LoadDependenciesOf mod)
594 if (failed r) then return Nothing else do
596 -- now parse & typecheck the module
597 hsc_env <- readIORef ref
598 let mg = hsc_mod_graph hsc_env
599 case [ ms | ms <- mg, ms_mod ms == mod ] of
602 r <- hscFileCheck hsc_env msg_act ms
606 HscChecked parsed tcd ->
607 return (Just (CheckedModule parsed tcd) )
609 -----------------------------------------------------------------------------
612 unload :: HscEnv -> [Linkable] -> IO ()
613 unload hsc_env stable_linkables -- Unload everthing *except* 'stable_linkables'
614 = case ghcMode (hsc_dflags hsc_env) of
615 BatchCompile -> return ()
616 JustTypecheck -> return ()
618 Interactive -> Linker.unload (hsc_dflags hsc_env) stable_linkables
620 Interactive -> panic "unload: no interpreter"
622 other -> panic "unload: strange mode"
624 -- -----------------------------------------------------------------------------
628 Stability tells us which modules definitely do not need to be recompiled.
629 There are two main reasons for having stability:
631 - avoid doing a complete upsweep of the module graph in GHCi when
632 modules near the bottom of the tree have not changed.
634 - to tell GHCi when it can load object code: we can only load object code
635 for a module when we also load object code fo all of the imports of the
636 module. So we need to know that we will definitely not be recompiling
637 any of these modules, and we can use the object code.
639 NB. stability is of no importance to BatchCompile at all, only Interactive.
640 (ToDo: what about JustTypecheck?)
642 The stability check is as follows. Both stableObject and
643 stableBCO are used during the upsweep phase later.
646 stable m = stableObject m || stableBCO m
649 all stableObject (imports m)
650 && old linkable does not exist, or is == on-disk .o
651 && date(on-disk .o) > date(.hs)
654 all stable (imports m)
655 && date(BCO) > date(.hs)
658 These properties embody the following ideas:
660 - if a module is stable:
661 - if it has been compiled in a previous pass (present in HPT)
662 then it does not need to be compiled or re-linked.
663 - if it has not been compiled in a previous pass,
664 then we only need to read its .hi file from disk and
665 link it to produce a ModDetails.
667 - if a modules is not stable, we will definitely be at least
668 re-linking, and possibly re-compiling it during the upsweep.
669 All non-stable modules can (and should) therefore be unlinked
672 - Note that objects are only considered stable if they only depend
673 on other objects. We can't link object code against byte code.
677 :: HomePackageTable -- HPT from last compilation
678 -> [SCC ModSummary] -- current module graph (cyclic)
679 -> [Module] -- all home modules
680 -> ([Module], -- stableObject
681 [Module]) -- stableBCO
683 checkStability hpt sccs all_home_mods = foldl checkSCC ([],[]) sccs
685 checkSCC (stable_obj, stable_bco) scc0
686 | stableObjects = (scc_mods ++ stable_obj, stable_bco)
687 | stableBCOs = (stable_obj, scc_mods ++ stable_bco)
688 | otherwise = (stable_obj, stable_bco)
690 scc = flattenSCC scc0
691 scc_mods = map ms_mod scc
692 home_module m = m `elem` all_home_mods && m `notElem` scc_mods
694 scc_allimps = nub (filter home_module (concatMap ms_allimps scc))
695 -- all imports outside the current SCC, but in the home pkg
697 stable_obj_imps = map (`elem` stable_obj) scc_allimps
698 stable_bco_imps = map (`elem` stable_bco) scc_allimps
705 and (zipWith (||) stable_obj_imps stable_bco_imps)
709 | Just t <- ms_obj_date ms = t >= ms_hs_date ms
713 same_as_prev t = case lookupModuleEnv hpt (ms_mod ms) of
715 Just hmi | Just l <- hm_linkable hmi
716 -> isObjectLinkable l && t == linkableTime l
717 -- why '>=' rather than '>' above? If the filesystem stores
718 -- times to the nearset second, we may occasionally find that
719 -- the object & source have the same modification time,
720 -- especially if the source was automatically generated
721 -- and compiled. Using >= is slightly unsafe, but it matches
725 = case lookupModuleEnv hpt (ms_mod ms) of
727 Just hmi | Just l <- hm_linkable hmi ->
728 not (isObjectLinkable l) &&
729 linkableTime l >= ms_hs_date ms
731 ms_allimps :: ModSummary -> [Module]
732 ms_allimps ms = ms_srcimps ms ++ ms_imps ms
734 -- -----------------------------------------------------------------------------
735 -- Prune the HomePackageTable
737 -- Before doing an upsweep, we can throw away:
739 -- - For non-stable modules:
740 -- - all ModDetails, all linked code
741 -- - all unlinked code that is out of date with respect to
744 -- This is VERY IMPORTANT otherwise we'll end up requiring 2x the
745 -- space at the end of the upsweep, because the topmost ModDetails of the
746 -- old HPT holds on to the entire type environment from the previous
749 pruneHomePackageTable
752 -> ([Module],[Module])
755 pruneHomePackageTable hpt summ (stable_obj, stable_bco)
756 = mapModuleEnv prune hpt
758 | is_stable modl = hmi'
759 | otherwise = hmi'{ hm_details = emptyModDetails }
761 modl = mi_module (hm_iface hmi)
762 hmi' | Just l <- hm_linkable hmi, linkableTime l < ms_hs_date ms
763 = hmi{ hm_linkable = Nothing }
766 where ms = expectJust "prune" (lookupModuleEnv ms_map modl)
768 ms_map = mkModuleEnv [(ms_mod ms, ms) | ms <- summ]
770 is_stable m = m `elem` stable_obj || m `elem` stable_bco
772 -- -----------------------------------------------------------------------------
774 -- Return (names of) all those in modsDone who are part of a cycle
775 -- as defined by theGraph.
776 findPartiallyCompletedCycles :: [Module] -> [SCC ModSummary] -> [Module]
777 findPartiallyCompletedCycles modsDone theGraph
781 chew ((AcyclicSCC v):rest) = chew rest -- acyclic? not interesting.
782 chew ((CyclicSCC vs):rest)
783 = let names_in_this_cycle = nub (map ms_mod vs)
785 = nub ([done | done <- modsDone,
786 done `elem` names_in_this_cycle])
787 chewed_rest = chew rest
789 if notNull mods_in_this_cycle
790 && length mods_in_this_cycle < length names_in_this_cycle
791 then mods_in_this_cycle ++ chewed_rest
794 -- -----------------------------------------------------------------------------
797 -- This is where we compile each module in the module graph, in a pass
798 -- from the bottom to the top of the graph.
800 -- There better had not be any cyclic groups here -- we check for them.
803 :: HscEnv -- Includes initially-empty HPT
804 -> HomePackageTable -- HPT from last time round (pruned)
805 -> ([Module],[Module]) -- stable modules (see checkStability)
806 -> IO () -- How to clean up unwanted tmp files
807 -> [SCC ModSummary] -- Mods to do (the worklist)
809 HscEnv, -- With an updated HPT
810 [ModSummary]) -- Mods which succeeded
812 upsweep hsc_env old_hpt stable_mods cleanup
814 = return (Succeeded, hsc_env, [])
816 upsweep hsc_env old_hpt stable_mods cleanup
818 = do putMsg (showSDoc (cyclicModuleErr ms))
819 return (Failed, hsc_env, [])
821 upsweep hsc_env old_hpt stable_mods cleanup
822 (AcyclicSCC mod:mods)
823 = do -- putStrLn ("UPSWEEP_MOD: hpt = " ++
824 -- show (map (moduleUserString.moduleName.mi_module.hm_iface)
825 -- (moduleEnvElts (hsc_HPT hsc_env)))
827 mb_mod_info <- upsweep_mod hsc_env old_hpt stable_mods mod
829 cleanup -- Remove unwanted tmp files between compilations
832 Nothing -> return (Failed, hsc_env, [])
834 { let this_mod = ms_mod mod
836 -- Add new info to hsc_env
837 hpt1 = extendModuleEnv (hsc_HPT hsc_env)
839 hsc_env1 = hsc_env { hsc_HPT = hpt1 }
841 -- Space-saving: delete the old HPT entry
842 -- for mod BUT if mod is a hs-boot
843 -- node, don't delete it. For the
844 -- interface, the HPT entry is probaby for the
845 -- main Haskell source file. Deleting it
846 -- would force .. (what?? --SDM)
847 old_hpt1 | isBootSummary mod = old_hpt
848 | otherwise = delModuleEnv old_hpt this_mod
850 ; (restOK, hsc_env2, modOKs)
851 <- upsweep hsc_env1 old_hpt1 stable_mods cleanup mods
852 ; return (restOK, hsc_env2, mod:modOKs)
856 -- Compile a single module. Always produce a Linkable for it if
857 -- successful. If no compilation happened, return the old Linkable.
858 upsweep_mod :: HscEnv
860 -> ([Module],[Module])
862 -> IO (Maybe HomeModInfo) -- Nothing => Failed
864 upsweep_mod hsc_env old_hpt (stable_obj, stable_bco) summary
867 this_mod = ms_mod summary
868 mb_obj_date = ms_obj_date summary
869 obj_fn = ml_obj_file (ms_location summary)
870 hs_date = ms_hs_date summary
872 compile_it :: Maybe Linkable -> IO (Maybe HomeModInfo)
873 compile_it = upsweep_compile hsc_env old_hpt this_mod summary
875 case ghcMode (hsc_dflags hsc_env) of
878 -- Batch-compilating is easy: just check whether we have
879 -- an up-to-date object file. If we do, then the compiler
880 -- needs to do a recompilation check.
881 _ | Just obj_date <- mb_obj_date, obj_date >= hs_date -> do
883 findObjectLinkable this_mod obj_fn obj_date
884 compile_it (Just linkable)
891 _ | is_stable_obj, isJust old_hmi ->
893 -- object is stable, and we have an entry in the
894 -- old HPT: nothing to do
896 | is_stable_obj, isNothing old_hmi -> do
898 findObjectLinkable this_mod obj_fn
899 (expectJust "upseep1" mb_obj_date)
900 compile_it (Just linkable)
901 -- object is stable, but we need to load the interface
902 -- off disk to make a HMI.
905 ASSERT(isJust old_hmi) -- must be in the old_hpt
907 -- BCO is stable: nothing to do
909 | Just hmi <- old_hmi,
910 Just l <- hm_linkable hmi, not (isObjectLinkable l),
911 linkableTime l >= ms_hs_date summary ->
913 -- we have an old BCO that is up to date with respect
914 -- to the source: do a recompilation check as normal.
918 -- no existing code at all: we must recompile.
920 is_stable_obj = this_mod `elem` stable_obj
921 is_stable_bco = this_mod `elem` stable_bco
923 old_hmi = lookupModuleEnv old_hpt this_mod
925 -- Run hsc to compile a module
926 upsweep_compile hsc_env old_hpt this_mod summary mb_old_linkable = do
928 -- The old interface is ok if it's in the old HPT
929 -- a) we're compiling a source file, and the old HPT
930 -- entry is for a source file
931 -- b) we're compiling a hs-boot file
932 -- Case (b) allows an hs-boot file to get the interface of its
933 -- real source file on the second iteration of the compilation
934 -- manager, but that does no harm. Otherwise the hs-boot file
935 -- will always be recompiled
938 = case lookupModuleEnv old_hpt this_mod of
940 Just hm_info | isBootSummary summary -> Just iface
941 | not (mi_boot iface) -> Just iface
942 | otherwise -> Nothing
944 iface = hm_iface hm_info
946 compresult <- compile hsc_env summary mb_old_linkable mb_old_iface
949 -- Compilation failed. Compile may still have updated the PCS, tho.
950 CompErrs -> return Nothing
952 -- Compilation "succeeded", and may or may not have returned a new
953 -- linkable (depending on whether compilation was actually performed
955 CompOK new_details new_iface new_linkable
956 -> do let new_info = HomeModInfo { hm_iface = new_iface,
957 hm_details = new_details,
958 hm_linkable = new_linkable }
959 return (Just new_info)
962 -- Filter modules in the HPT
963 retainInTopLevelEnvs :: [Module] -> HomePackageTable -> HomePackageTable
964 retainInTopLevelEnvs keep_these hpt
965 = mkModuleEnv [ (mod, expectJust "retain" mb_mod_info)
967 , let mb_mod_info = lookupModuleEnv hpt mod
968 , isJust mb_mod_info ]
970 -- ---------------------------------------------------------------------------
971 -- Topological sort of the module graph
974 :: Bool -- Drop hi-boot nodes? (see below)
978 -- Calculate SCCs of the module graph, possibly dropping the hi-boot nodes
979 -- The resulting list of strongly-connected-components is in topologically
980 -- sorted order, starting with the module(s) at the bottom of the
981 -- dependency graph (ie compile them first) and ending with the ones at
984 -- Drop hi-boot nodes (first boolean arg)?
986 -- False: treat the hi-boot summaries as nodes of the graph,
987 -- so the graph must be acyclic
989 -- True: eliminate the hi-boot nodes, and instead pretend
990 -- the a source-import of Foo is an import of Foo
991 -- The resulting graph has no hi-boot nodes, but can by cyclic
993 topSortModuleGraph drop_hs_boot_nodes summaries Nothing
994 = stronglyConnComp (fst (moduleGraphNodes drop_hs_boot_nodes summaries))
995 topSortModuleGraph drop_hs_boot_nodes summaries (Just mod)
996 = stronglyConnComp (map vertex_fn (reachable graph root))
998 -- restrict the graph to just those modules reachable from
999 -- the specified module. We do this by building a graph with
1000 -- the full set of nodes, and determining the reachable set from
1001 -- the specified node.
1002 (nodes, lookup_key) = moduleGraphNodes drop_hs_boot_nodes summaries
1003 (graph, vertex_fn, key_fn) = graphFromEdges' nodes
1005 | Just key <- lookup_key HsSrcFile mod, Just v <- key_fn key = v
1006 | otherwise = throwDyn (ProgramError "module does not exist")
1008 moduleGraphNodes :: Bool -> [ModSummary]
1009 -> ([(ModSummary, Int, [Int])], HscSource -> Module -> Maybe Int)
1010 moduleGraphNodes drop_hs_boot_nodes summaries = (nodes, lookup_key)
1012 -- Drop hs-boot nodes by using HsSrcFile as the key
1013 hs_boot_key | drop_hs_boot_nodes = HsSrcFile
1014 | otherwise = HsBootFile
1016 -- We use integers as the keys for the SCC algorithm
1017 nodes :: [(ModSummary, Int, [Int])]
1018 nodes = [(s, expectJust "topSort" (lookup_key (ms_hsc_src s) (ms_mod s)),
1019 out_edge_keys hs_boot_key (ms_srcimps s) ++
1020 out_edge_keys HsSrcFile (ms_imps s) )
1022 , not (isBootSummary s && drop_hs_boot_nodes) ]
1023 -- Drop the hi-boot ones if told to do so
1025 key_map :: NodeMap Int
1026 key_map = listToFM ([(ms_mod s, ms_hsc_src s) | s <- summaries]
1029 lookup_key :: HscSource -> Module -> Maybe Int
1030 lookup_key hs_src mod = lookupFM key_map (mod, hs_src)
1032 out_edge_keys :: HscSource -> [Module] -> [Int]
1033 out_edge_keys hi_boot ms = mapCatMaybes (lookup_key hi_boot) ms
1034 -- If we want keep_hi_boot_nodes, then we do lookup_key with
1035 -- the IsBootInterface parameter True; else False
1038 type NodeKey = (Module, HscSource) -- The nodes of the graph are
1039 type NodeMap a = FiniteMap NodeKey a -- keyed by (mod, src_file_type) pairs
1041 msKey :: ModSummary -> NodeKey
1042 msKey (ModSummary { ms_mod = mod, ms_hsc_src = boot }) = (mod,boot)
1044 emptyNodeMap :: NodeMap a
1045 emptyNodeMap = emptyFM
1047 mkNodeMap :: [ModSummary] -> NodeMap ModSummary
1048 mkNodeMap summaries = listToFM [ (msKey s, s) | s <- summaries]
1050 nodeMapElts :: NodeMap a -> [a]
1051 nodeMapElts = eltsFM
1053 -- -----------------------------------------------------------------
1054 -- The unlinked image
1056 -- The compilation manager keeps a list of compiled, but as-yet unlinked
1057 -- binaries (byte code or object code). Even when it links bytecode
1058 -- it keeps the unlinked version so it can re-link it later without
1061 type UnlinkedImage = [Linkable] -- the unlinked images (should be a set, really)
1063 findModuleLinkable_maybe :: [Linkable] -> Module -> Maybe Linkable
1064 findModuleLinkable_maybe lis mod
1065 = case [LM time nm us | LM time nm us <- lis, nm == mod] of
1068 many -> pprPanic "findModuleLinkable" (ppr mod)
1070 delModuleLinkable :: [Linkable] -> Module -> [Linkable]
1071 delModuleLinkable ls mod = [ l | l@(LM _ nm _) <- ls, nm /= mod ]
1073 -----------------------------------------------------------------------------
1074 -- Downsweep (dependency analysis)
1076 -- Chase downwards from the specified root set, returning summaries
1077 -- for all home modules encountered. Only follow source-import
1080 -- We pass in the previous collection of summaries, which is used as a
1081 -- cache to avoid recalculating a module summary if the source is
1084 -- The returned list of [ModSummary] nodes has one node for each home-package
1085 -- module, plus one for any hs-boot files. The imports of these nodes
1086 -- are all there, including the imports of non-home-package modules.
1089 -> [ModSummary] -- Old summaries
1090 -> [Module] -- Ignore dependencies on these; treat them as
1091 -- if they were package modules
1093 downsweep hsc_env old_summaries excl_mods
1094 = do rootSummaries <- mapM getRootSummary roots
1095 checkDuplicates rootSummaries
1096 loop (concatMap msDeps rootSummaries)
1097 (mkNodeMap rootSummaries)
1099 roots = hsc_targets hsc_env
1101 old_summary_map :: NodeMap ModSummary
1102 old_summary_map = mkNodeMap old_summaries
1104 getRootSummary :: Target -> IO ModSummary
1105 getRootSummary (Target (TargetFile file) maybe_buf)
1106 = do exists <- doesFileExist file
1107 if exists then summariseFile hsc_env file maybe_buf else do
1108 throwDyn (CmdLineError ("can't find file: " ++ file))
1109 getRootSummary (Target (TargetModule modl) maybe_buf)
1110 = do maybe_summary <- summarise hsc_env emptyNodeMap Nothing False
1111 modl maybe_buf excl_mods
1112 case maybe_summary of
1113 Nothing -> packageModErr modl
1116 -- In a root module, the filename is allowed to diverge from the module
1117 -- name, so we have to check that there aren't multiple root files
1118 -- defining the same module (otherwise the duplicates will be silently
1119 -- ignored, leading to confusing behaviour).
1120 checkDuplicates :: [ModSummary] -> IO ()
1121 checkDuplicates summaries = mapM_ check summaries
1126 many -> multiRootsErr modl many
1127 where modl = ms_mod summ
1129 [ expectJust "checkDup" (ml_hs_file (ms_location summ'))
1130 | summ' <- summaries, ms_mod summ' == modl ]
1132 loop :: [(FilePath,Module,IsBootInterface)]
1133 -- Work list: process these modules
1134 -> NodeMap ModSummary
1137 -- The result includes the worklist, except
1138 -- for those mentioned in the visited set
1139 loop [] done = return (nodeMapElts done)
1140 loop ((cur_path, wanted_mod, is_boot) : ss) done
1141 | key `elemFM` done = loop ss done
1142 | otherwise = do { mb_s <- summarise hsc_env old_summary_map
1143 (Just cur_path) is_boot
1144 wanted_mod Nothing excl_mods
1146 Nothing -> loop ss done
1147 Just s -> loop (msDeps s ++ ss)
1148 (addToFM done key s) }
1150 key = (wanted_mod, if is_boot then HsBootFile else HsSrcFile)
1152 msDeps :: ModSummary -> [(FilePath, -- Importing module
1153 Module, -- Imported module
1154 IsBootInterface)] -- {-# SOURCE #-} import or not
1155 -- (msDeps s) returns the dependencies of the ModSummary s.
1156 -- A wrinkle is that for a {-# SOURCE #-} import we return
1157 -- *both* the hs-boot file
1158 -- *and* the source file
1159 -- as "dependencies". That ensures that the list of all relevant
1160 -- modules always contains B.hs if it contains B.hs-boot.
1161 -- Remember, this pass isn't doing the topological sort. It's
1162 -- just gathering the list of all relevant ModSummaries
1163 msDeps s = concat [ [(f, m, True), (f,m,False)] | m <- ms_srcimps s]
1164 ++ [(f,m,False) | m <- ms_imps s]
1166 f = msHsFilePath s -- Keep the importing module for error reporting
1169 -----------------------------------------------------------------------------
1170 -- Summarising modules
1172 -- We have two types of summarisation:
1174 -- * Summarise a file. This is used for the root module(s) passed to
1175 -- cmLoadModules. The file is read, and used to determine the root
1176 -- module name. The module name may differ from the filename.
1178 -- * Summarise a module. We are given a module name, and must provide
1179 -- a summary. The finder is used to locate the file in which the module
1182 summariseFile :: HscEnv -> FilePath
1183 -> Maybe (StringBuffer,ClockTime)
1185 -- Used for Haskell source only, I think
1186 -- We know the file name, and we know it exists,
1187 -- but we don't necessarily know the module name (might differ)
1188 summariseFile hsc_env file maybe_buf
1189 = do let dflags = hsc_dflags hsc_env
1191 (dflags', hspp_fn, buf)
1192 <- preprocessFile dflags file maybe_buf
1194 (srcimps,the_imps,mod) <- getImports dflags' buf hspp_fn
1196 -- Make a ModLocation for this file
1197 location <- mkHomeModLocation dflags mod file
1199 -- Tell the Finder cache where it is, so that subsequent calls
1200 -- to findModule will find it, even if it's not on any search path
1201 addHomeModuleToFinder hsc_env mod location
1203 src_timestamp <- case maybe_buf of
1204 Just (_,t) -> return t
1205 Nothing -> getModificationTime file
1207 obj_timestamp <- modificationTimeIfExists (ml_obj_file location)
1209 return (ModSummary { ms_mod = mod, ms_hsc_src = HsSrcFile,
1210 ms_location = location,
1211 ms_hspp_file = Just hspp_fn,
1212 ms_hspp_buf = Just buf,
1213 ms_srcimps = srcimps, ms_imps = the_imps,
1214 ms_hs_date = src_timestamp,
1215 ms_obj_date = obj_timestamp })
1217 -- Summarise a module, and pick up source and timestamp.
1219 -> NodeMap ModSummary -- Map of old summaries
1220 -> Maybe FilePath -- Importing module (for error messages)
1221 -> IsBootInterface -- True <=> a {-# SOURCE #-} import
1222 -> Module -- Imported module to be summarised
1223 -> Maybe (StringBuffer, ClockTime)
1224 -> [Module] -- Modules to exclude
1225 -> IO (Maybe ModSummary) -- Its new summary
1227 summarise hsc_env old_summary_map cur_mod is_boot wanted_mod maybe_buf excl_mods
1228 | wanted_mod `elem` excl_mods
1231 | Just old_summary <- lookupFM old_summary_map (wanted_mod, hsc_src)
1232 = do -- Find its new timestamp; all the
1233 -- ModSummaries in the old map have valid ml_hs_files
1234 let location = ms_location old_summary
1235 src_fn = expectJust "summarise" (ml_hs_file location)
1237 -- return the cached summary if the source didn't change
1238 src_timestamp <- case maybe_buf of
1239 Just (_,t) -> return t
1240 Nothing -> getModificationTime src_fn
1242 if ms_hs_date old_summary == src_timestamp
1243 then do -- update the object-file timestamp
1244 obj_timestamp <- getObjTimestamp location is_boot
1245 return (Just old_summary{ ms_obj_date = obj_timestamp })
1247 -- source changed: re-summarise
1248 new_summary location src_fn maybe_buf src_timestamp
1251 = do found <- findModule hsc_env wanted_mod True {-explicit-}
1254 | not (isHomePackage pkg) -> return Nothing
1255 -- Drop external-pkg
1256 | isJust (ml_hs_file location) -> just_found location
1258 err -> noModError dflags cur_mod wanted_mod err
1261 dflags = hsc_dflags hsc_env
1263 hsc_src = if is_boot then HsBootFile else HsSrcFile
1265 just_found location = do
1266 -- Adjust location to point to the hs-boot source file,
1267 -- hi file, object file, when is_boot says so
1268 let location' | is_boot = addBootSuffixLocn location
1269 | otherwise = location
1270 src_fn = expectJust "summarise2" (ml_hs_file location')
1272 -- Check that it exists
1273 -- It might have been deleted since the Finder last found it
1274 maybe_t <- modificationTimeIfExists src_fn
1276 Nothing -> noHsFileErr cur_mod src_fn
1277 Just t -> new_summary location' src_fn Nothing t
1280 new_summary location src_fn maybe_bug src_timestamp
1282 -- Preprocess the source file and get its imports
1283 -- The dflags' contains the OPTIONS pragmas
1284 (dflags', hspp_fn, buf) <- preprocessFile dflags src_fn maybe_buf
1285 (srcimps, the_imps, mod_name) <- getImports dflags' buf hspp_fn
1287 when (mod_name /= wanted_mod) $
1288 throwDyn (ProgramError
1289 (showSDoc (text src_fn
1290 <> text ": file name does not match module name"
1291 <+> quotes (ppr mod_name))))
1293 -- Find the object timestamp, and return the summary
1294 obj_timestamp <- getObjTimestamp location is_boot
1296 return (Just ( ModSummary { ms_mod = wanted_mod,
1297 ms_hsc_src = hsc_src,
1298 ms_location = location,
1299 ms_hspp_file = Just hspp_fn,
1300 ms_hspp_buf = Just buf,
1301 ms_srcimps = srcimps,
1303 ms_hs_date = src_timestamp,
1304 ms_obj_date = obj_timestamp }))
1307 getObjTimestamp location is_boot
1308 = if is_boot then return Nothing
1309 else modificationTimeIfExists (ml_obj_file location)
1312 preprocessFile :: DynFlags -> FilePath -> Maybe (StringBuffer,ClockTime)
1313 -> IO (DynFlags, FilePath, StringBuffer)
1314 preprocessFile dflags src_fn Nothing
1316 (dflags', hspp_fn) <- preprocess dflags src_fn
1317 buf <- hGetStringBuffer hspp_fn
1318 return (dflags', hspp_fn, buf)
1320 preprocessFile dflags src_fn (Just (buf, time))
1322 -- case we bypass the preprocessing stage?
1324 local_opts = getOptionsFromStringBuffer buf
1326 (dflags', errs) <- parseDynamicFlags dflags local_opts
1330 | Unlit _ <- startPhase src_fn = True
1331 -- note: local_opts is only required if there's no Unlit phase
1332 | dopt Opt_Cpp dflags' = True
1333 | dopt Opt_Pp dflags' = True
1336 when needs_preprocessing $
1337 ghcError (ProgramError "buffer needs preprocesing; interactive check disabled")
1339 return (dflags', "<buffer>", buf)
1342 -----------------------------------------------------------------------------
1344 -----------------------------------------------------------------------------
1346 noModError :: DynFlags -> Maybe FilePath -> Module -> FindResult -> IO ab
1347 -- ToDo: we don't have a proper line number for this error
1348 noModError dflags cur_mod wanted_mod err
1349 = throwDyn $ ProgramError $ showSDoc $
1350 vcat [cantFindError dflags wanted_mod err,
1351 nest 2 (parens (pp_where cur_mod))]
1353 noHsFileErr cur_mod path
1354 = throwDyn $ CmdLineError $ showSDoc $
1355 vcat [text "Can't find" <+> text path,
1356 nest 2 (parens (pp_where cur_mod))]
1358 pp_where Nothing = text "one of the roots of the dependency analysis"
1359 pp_where (Just p) = text "imported from" <+> text p
1362 = throwDyn (CmdLineError (showSDoc (text "module" <+>
1363 quotes (ppr mod) <+>
1364 text "is a package module")))
1366 multiRootsErr mod files
1367 = throwDyn (ProgramError (showSDoc (
1368 text "module" <+> quotes (ppr mod) <+>
1369 text "is defined in multiple files:" <+>
1370 sep (map text files))))
1372 cyclicModuleErr :: [ModSummary] -> SDoc
1374 = hang (ptext SLIT("Module imports form a cycle for modules:"))
1375 2 (vcat (map show_one ms))
1377 show_one ms = sep [ show_mod (ms_hsc_src ms) (ms_mod ms),
1378 nest 2 $ ptext SLIT("imports:") <+>
1379 (pp_imps HsBootFile (ms_srcimps ms)
1380 $$ pp_imps HsSrcFile (ms_imps ms))]
1381 show_mod hsc_src mod = ppr mod <> text (hscSourceString hsc_src)
1382 pp_imps src mods = fsep (map (show_mod src) mods)
1385 -- | Inform GHC that the working directory has changed. GHC will flush
1386 -- its cache of module locations, since it may no longer be valid.
1387 -- Note: if you change the working directory, you should also unload
1388 -- the current program (set targets to empty, followed by load).
1389 workingDirectoryChanged :: Session -> IO ()
1390 workingDirectoryChanged s = withSession s $ \hsc_env ->
1391 flushFinderCache (hsc_FC hsc_env)
1393 -- -----------------------------------------------------------------------------
1394 -- inspecting the session
1396 -- | Get the module dependency graph.
1397 getModuleGraph :: Session -> IO ModuleGraph -- ToDo: DiGraph ModSummary
1398 getModuleGraph s = withSession s (return . hsc_mod_graph)
1400 isLoaded :: Session -> Module -> IO Bool
1401 isLoaded s m = withSession s $ \hsc_env ->
1402 return $! isJust (lookupModuleEnv (hsc_HPT hsc_env) m)
1404 getBindings :: Session -> IO [TyThing]
1405 getBindings s = withSession s (return . nameEnvElts . ic_type_env . hsc_IC)
1407 getPrintUnqual :: Session -> IO PrintUnqualified
1408 getPrintUnqual s = withSession s (return . icPrintUnqual . hsc_IC)
1411 getModuleInfo :: Session -> Module -> IO ModuleInfo
1415 | BinaryCode FilePath
1417 data ModuleInfo = ModuleInfo {
1418 lm_modulename :: Module,
1419 lm_summary :: ModSummary,
1420 lm_interface :: ModIface,
1421 lm_tc_code :: Maybe TypecheckedCode,
1422 lm_rn_code :: Maybe RenamedCode,
1423 lm_obj :: Maybe ObjectCode
1426 type TypecheckedCode = HsTypecheckedGroup
1427 type RenamedCode = [HsGroup Name]
1429 -- ToDo: typechecks abstract syntax or renamed abstract syntax. Issues:
1430 -- - typechecked syntax includes extra dictionary translation and
1431 -- AbsBinds which need to be translated back into something closer to
1432 -- the original source.
1433 -- - renamed syntax currently doesn't exist in a single blob, since
1434 -- renaming and typechecking are interleaved at splice points. We'd
1435 -- need a restriction that there are no splices in the source module.
1438 -- - Data and Typeable instances for HsSyn.
1441 -- - things that aren't in the output of the renamer:
1442 -- - the export list
1446 -- - things that aren't in the output of the typechecker right now:
1447 -- - the export list
1449 -- - type signatures
1450 -- - type/data/newtype declarations
1451 -- - class declarations
1453 -- - extra things in the typechecker's output:
1454 -- - default methods are turned into top-level decls.
1455 -- - dictionary bindings
1457 -- ToDo: check for small transformations that happen to the syntax in
1458 -- the typechecker (eg. -e ==> negate e, perhaps for fromIntegral)
1460 -- ToDo: maybe use TH syntax instead of IfaceSyn? There's already a way
1461 -- to get from TyCons, Ids etc. to TH syntax (reify).
1463 -- :browse will use either lm_toplev or inspect lm_interface, depending
1464 -- on whether the module is interpreted or not.
1466 -- various abstract syntax types (perhaps IfaceBlah)
1470 -- This is for reconstructing refactored source code
1471 -- Calls the lexer repeatedly.
1472 -- ToDo: add comment tokens to token stream
1473 getTokenStream :: Session -> Module -> IO [Located Token]
1476 -- -----------------------------------------------------------------------------
1477 -- Interactive evaluation
1481 -- | Set the interactive evaluation context.
1483 -- Setting the context doesn't throw away any bindings; the bindings
1484 -- we've built up in the InteractiveContext simply move to the new
1485 -- module. They always shadow anything in scope in the current context.
1486 setContext :: Session
1487 -> [Module] -- entire top level scope of these modules
1488 -> [Module] -- exports only of these modules
1490 setContext (Session ref) toplevs exports = do
1491 hsc_env <- readIORef ref
1492 let old_ic = hsc_IC hsc_env
1493 hpt = hsc_HPT hsc_env
1495 mapM_ (checkModuleExists hsc_env hpt) exports
1496 export_env <- mkExportEnv hsc_env exports
1497 toplev_envs <- mapM (mkTopLevEnv hpt) toplevs
1498 let all_env = foldr plusGlobalRdrEnv export_env toplev_envs
1499 writeIORef ref hsc_env{ hsc_IC = old_ic { ic_toplev_scope = toplevs,
1500 ic_exports = exports,
1501 ic_rn_gbl_env = all_env } }
1503 checkModuleExists :: HscEnv -> HomePackageTable -> Module -> IO ()
1504 checkModuleExists hsc_env hpt mod =
1505 case lookupModuleEnv hpt mod of
1506 Just mod_info -> return ()
1507 _not_a_home_module -> do
1508 res <- findPackageModule hsc_env mod True
1510 Found _ _ -> return ()
1511 err -> let msg = cantFindError (hsc_dflags hsc_env) mod err in
1512 throwDyn (CmdLineError (showSDoc msg))
1514 mkTopLevEnv :: HomePackageTable -> Module -> IO GlobalRdrEnv
1515 mkTopLevEnv hpt modl
1516 = case lookupModuleEnv hpt modl of
1518 throwDyn (ProgramError ("mkTopLevEnv: not a home module "
1519 ++ showSDoc (pprModule modl)))
1521 case mi_globals (hm_iface details) of
1523 throwDyn (ProgramError ("mkTopLevEnv: not interpreted "
1524 ++ showSDoc (pprModule modl)))
1525 Just env -> return env
1527 -- | Get the interactive evaluation context, consisting of a pair of the
1528 -- set of modules from which we take the full top-level scope, and the set
1529 -- of modules from which we take just the exports respectively.
1530 getContext :: Session -> IO ([Module],[Module])
1531 getContext s = withSession s (\HscEnv{ hsc_IC=ic } ->
1532 return (ic_toplev_scope ic, ic_exports ic))
1534 -- | Returns 'True' if the specified module is interpreted, and hence has
1535 -- its full top-level scope available.
1536 moduleIsInterpreted :: Session -> Module -> IO Bool
1537 moduleIsInterpreted s modl = withSession s $ \h ->
1538 case lookupModuleEnv (hsc_HPT h) modl of
1539 Just details -> return (isJust (mi_globals (hm_iface details)))
1540 _not_a_home_module -> return False
1542 -- | Looks up an identifier in the current interactive context (for :info)
1543 getInfo :: Session -> String -> IO [GetInfoResult]
1544 getInfo s id = withSession s $ \hsc_env -> hscGetInfo hsc_env id
1546 -- -----------------------------------------------------------------------------
1547 -- Getting the type of an expression
1549 -- | Get the type of an expression
1550 exprType :: Session -> String -> IO (Maybe Type)
1551 exprType s expr = withSession s $ \hsc_env -> do
1552 maybe_stuff <- hscTcExpr hsc_env expr
1554 Nothing -> return Nothing
1555 Just ty -> return (Just tidy_ty)
1557 tidy_ty = tidyType emptyTidyEnv ty
1558 dflags = hsc_dflags hsc_env
1560 -- -----------------------------------------------------------------------------
1561 -- Getting the kind of a type
1563 -- | Get the kind of a type
1564 typeKind :: Session -> String -> IO (Maybe Kind)
1565 typeKind s str = withSession s $ \hsc_env -> do
1566 maybe_stuff <- hscKcType hsc_env str
1568 Nothing -> return Nothing
1569 Just kind -> return (Just kind)
1571 -----------------------------------------------------------------------------
1572 -- lookupName: returns the TyThing for a Name in the interactive context.
1573 -- ToDo: should look it up in the full environment
1575 lookupName :: Session -> Name -> IO (Maybe TyThing)
1576 lookupName s name = withSession s $ \hsc_env -> do
1577 return $! lookupNameEnv (ic_type_env (hsc_IC hsc_env)) name
1579 -----------------------------------------------------------------------------
1580 -- cmCompileExpr: compile an expression and deliver an HValue
1582 compileExpr :: Session -> String -> IO (Maybe HValue)
1583 compileExpr s expr = withSession s $ \hsc_env -> do
1584 maybe_stuff <- hscStmt hsc_env ("let __cmCompileExpr = "++expr)
1586 Nothing -> return Nothing
1587 Just (new_ic, names, hval) -> do
1589 hvals <- (unsafeCoerce# hval) :: IO [HValue]
1591 case (names,hvals) of
1592 ([n],[hv]) -> return (Just hv)
1593 _ -> panic "compileExpr"
1595 -- -----------------------------------------------------------------------------
1596 -- running a statement interactively
1599 = RunOk [Name] -- ^ names bound by this evaluation
1600 | RunFailed -- ^ statement failed compilation
1601 | RunException Exception -- ^ statement raised an exception
1603 -- | Run a statement in the current interactive context. Statemenet
1604 -- may bind multple values.
1605 runStmt :: Session -> String -> IO RunResult
1606 runStmt (Session ref) expr
1608 hsc_env <- readIORef ref
1610 -- Turn off -fwarn-unused-bindings when running a statement, to hide
1611 -- warnings about the implicit bindings we introduce.
1612 let dflags' = dopt_unset (hsc_dflags hsc_env) Opt_WarnUnusedBinds
1613 hsc_env' = hsc_env{ hsc_dflags = dflags' }
1615 maybe_stuff <- hscStmt hsc_env' expr
1618 Nothing -> return RunFailed
1619 Just (new_hsc_env, names, hval) -> do
1621 let thing_to_run = unsafeCoerce# hval :: IO [HValue]
1622 either_hvals <- sandboxIO thing_to_run
1624 case either_hvals of
1626 -- on error, keep the *old* interactive context,
1627 -- so that 'it' is not bound to something
1628 -- that doesn't exist.
1629 return (RunException e)
1632 -- Get the newly bound things, and bind them.
1633 -- Don't need to delete any shadowed bindings;
1634 -- the new ones override the old ones.
1635 extendLinkEnv (zip names hvals)
1637 writeIORef ref new_hsc_env
1638 return (RunOk names)
1641 -- We run the statement in a "sandbox" to protect the rest of the
1642 -- system from anything the expression might do. For now, this
1643 -- consists of just wrapping it in an exception handler, but see below
1644 -- for another version.
1646 sandboxIO :: IO a -> IO (Either Exception a)
1647 sandboxIO thing = Exception.try thing
1650 -- This version of sandboxIO runs the expression in a completely new
1651 -- RTS main thread. It is disabled for now because ^C exceptions
1652 -- won't be delivered to the new thread, instead they'll be delivered
1653 -- to the (blocked) GHCi main thread.
1655 -- SLPJ: when re-enabling this, reflect a wrong-stat error as an exception
1657 sandboxIO :: IO a -> IO (Either Int (Either Exception a))
1658 sandboxIO thing = do
1659 st_thing <- newStablePtr (Exception.try thing)
1660 alloca $ \ p_st_result -> do
1661 stat <- rts_evalStableIO st_thing p_st_result
1662 freeStablePtr st_thing
1664 then do st_result <- peek p_st_result
1665 result <- deRefStablePtr st_result
1666 freeStablePtr st_result
1667 return (Right result)
1669 return (Left (fromIntegral stat))
1671 foreign import "rts_evalStableIO" {- safe -}
1672 rts_evalStableIO :: StablePtr (IO a) -> Ptr (StablePtr a) -> IO CInt
1673 -- more informative than the C type!
1676 -- ---------------------------------------------------------------------------
1677 -- cmBrowseModule: get all the TyThings defined in a module
1679 browseModule :: Session -> Module -> Bool -> IO [IfaceDecl]
1680 browseModule s modl exports_only = withSession s $ \hsc_env -> do
1681 mb_decls <- getModuleContents hsc_env modl exports_only
1683 Nothing -> return [] -- An error of some kind
1684 Just ds -> return ds
1687 -----------------------------------------------------------------------------
1688 -- show a module and it's source/object filenames
1690 showModule :: Session -> ModSummary -> IO String
1691 showModule s mod_summary = withSession s $ \hsc_env -> do
1692 case lookupModuleEnv (hsc_HPT hsc_env) (ms_mod mod_summary) of
1693 Nothing -> panic "missing linkable"
1694 Just mod_info -> return (showModMsg obj_linkable mod_summary)
1696 obj_linkable = isObjectLinkable (fromJust (hm_linkable mod_info))