1 -- -----------------------------------------------------------------------------
3 -- (c) The University of Glasgow, 2005
7 -- -----------------------------------------------------------------------------
13 defaultCleanupHandler,
17 -- * Flags and settings
18 DynFlags(..), DynFlag(..), GhcMode(..), HscTarget(..), dopt,
26 Target(..), TargetId(..),
33 -- * Loading\/compiling the program
35 load, LoadHowMuch(..), SuccessFlag(..), -- also does depanal
37 workingDirectoryChanged,
38 checkModule, CheckedModule(..),
39 TypecheckedSource, ParsedSource,
41 -- * Inspecting the module structure of the program
42 ModuleGraph, ModSummary(..),
47 -- * Inspecting modules
52 modInfoPrintUnqualified,
56 -- * Interactive evaluation
57 getBindings, getPrintUnqual,
59 setContext, getContext,
62 getInfo, GetInfoResult,
73 -- * Abstract syntax elements
76 Module, mkModule, pprModule,
83 isImplicitId, isDeadBinder,
84 isSpecPragmaId, isExportedId, isLocalId, isGlobalId,
86 isPrimOpId, isFCallId,
87 isDataConWorkId, idDataCon,
88 isBottomingId, isDictonaryId,
90 -- ** Type constructors
92 isClassTyCon, isSynTyCon, isNewTyCon,
94 -- ** Data constructors
99 classSCTheta, classTvsFds,
101 -- ** Types and Kinds
109 GhcException(..), showGhcException,
119 * return error messages rather than printing them.
120 * inline bits of HscMain here to simplify layering: hscGetInfo,
122 * implement second argument to load.
123 * we need to expose DynFlags, so should parseDynamicFlags really be
124 part of this interface?
125 * what StaticFlags should we expose, if any?
128 #include "HsVersions.h"
131 import qualified Linker
132 import Linker ( HValue, extendLinkEnv )
133 import NameEnv ( lookupNameEnv )
134 import TcRnDriver ( mkExportEnv, getModuleContents, tcRnLookupRdrName )
135 import RdrName ( plusGlobalRdrEnv )
136 import HscMain ( hscGetInfo, GetInfoResult, hscParseIdentifier,
137 hscStmt, hscTcExpr, hscKcType )
138 import Type ( tidyType )
139 import VarEnv ( emptyTidyEnv )
140 import GHC.Exts ( unsafeCoerce# )
141 import IfaceSyn ( IfaceDecl )
144 import Packages ( initPackages )
145 import NameSet ( NameSet, nameSetToList )
146 import RdrName ( GlobalRdrEnv )
147 import HsSyn ( HsModule, LHsBinds )
148 import Type ( Kind, Type, dropForAlls )
149 import Id ( Id, idType, isImplicitId, isDeadBinder,
150 isSpecPragmaId, isExportedId, isLocalId, isGlobalId,
152 isPrimOpId, isFCallId,
153 isDataConWorkId, idDataCon,
155 import TyCon ( TyCon, isClassTyCon, isSynTyCon, isNewTyCon )
156 import Class ( Class, classSCTheta, classTvsFds )
157 import DataCon ( DataCon )
158 import Name ( Name, getName, nameModule_maybe )
159 import RdrName ( RdrName, gre_name, globalRdrEnvElts )
160 import NameEnv ( nameEnvElts )
161 import SrcLoc ( Located(..), mkSrcLoc, srcLocSpan )
162 import DriverPipeline
163 import DriverPhases ( Phase(..), isHaskellSrcFilename, startPhase )
164 import GetImports ( getImports )
165 import Packages ( isHomePackage )
167 import HscMain ( newHscEnv, hscFileCheck, HscResult(..) )
171 import SysTools ( initSysTools, cleanTempFiles )
176 import ErrUtils ( showPass, Messages, putMsg, debugTraceMsg )
177 import qualified ErrUtils
179 import StringBuffer ( StringBuffer, hGetStringBuffer )
181 import SysTools ( cleanTempFilesExcept )
182 import BasicTypes ( SuccessFlag(..), succeeded, failed )
183 import Maybes ( orElse, expectJust, mapCatMaybes )
184 import TcType ( tcSplitSigmaTy, isDictTy )
185 import Bag ( unitBag, emptyBag )
186 import FastString ( mkFastString )
188 import Directory ( getModificationTime, doesFileExist )
189 import Maybe ( isJust, isNothing, fromJust, fromMaybe, catMaybes )
190 import Maybes ( expectJust )
191 import List ( partition, nub )
192 import qualified List
193 import Monad ( unless, when, foldM )
194 import System ( exitWith, ExitCode(..) )
195 import Time ( ClockTime )
196 import EXCEPTION as Exception hiding (handle)
199 import Prelude hiding (init)
201 -- -----------------------------------------------------------------------------
202 -- Exception handlers
204 -- | Install some default exception handlers and run the inner computation.
205 -- Unless you want to handle exceptions yourself, you should wrap this around
206 -- the top level of your program. The default handlers output the error
207 -- message(s) to stderr and exit cleanly.
208 defaultErrorHandler :: IO a -> IO a
209 defaultErrorHandler inner =
210 -- top-level exception handler: any unrecognised exception is a compiler bug.
211 handle (\exception -> do
214 -- an IO exception probably isn't our fault, so don't panic
215 IOException _ -> putMsg (show exception)
216 AsyncException StackOverflow ->
217 putMsg "stack overflow: use +RTS -K<size> to increase it"
218 _other -> putMsg (show (Panic (show exception)))
219 exitWith (ExitFailure 1)
222 -- all error messages are propagated as exceptions
223 handleDyn (\dyn -> do
226 PhaseFailed _ code -> exitWith code
227 Interrupted -> exitWith (ExitFailure 1)
228 _ -> do putMsg (show (dyn :: GhcException))
229 exitWith (ExitFailure 1)
233 -- | Install a default cleanup handler to remove temporary files
234 -- deposited by a GHC run. This is seperate from
235 -- 'defaultErrorHandler', because you might want to override the error
236 -- handling, but still get the ordinary cleanup behaviour.
237 defaultCleanupHandler :: DynFlags -> IO a -> IO a
238 defaultCleanupHandler dflags inner =
239 -- make sure we clean up after ourselves
240 later (unless (dopt Opt_KeepTmpFiles dflags) $
241 cleanTempFiles dflags)
242 -- exceptions will be blocked while we clean the temporary files,
243 -- so there shouldn't be any difficulty if we receive further
248 -- | Initialises GHC. This must be done /once/ only. Takes the
249 -- command-line arguments. All command-line arguments which aren't
250 -- understood by GHC will be returned.
252 init :: [String] -> IO [String]
255 installSignalHandlers
257 -- Grab the -B option if there is one
258 let (minusB_args, argv1) = partition (prefixMatch "-B") args
259 dflags0 <- initSysTools minusB_args defaultDynFlags
260 writeIORef v_initDynFlags dflags0
262 -- Parse the static flags
263 argv2 <- parseStaticFlags argv1
266 GLOBAL_VAR(v_initDynFlags, error "initDynFlags", DynFlags)
267 -- stores the DynFlags between the call to init and subsequent
268 -- calls to newSession.
270 -- | Starts a new session. A session consists of a set of loaded
271 -- modules, a set of options (DynFlags), and an interactive context.
272 -- ToDo: GhcMode should say "keep typechecked code" and\/or "keep renamed
274 newSession :: GhcMode -> IO Session
276 dflags0 <- readIORef v_initDynFlags
277 dflags <- initDynFlags dflags0
278 env <- newHscEnv dflags{ ghcMode=mode }
282 -- tmp: this breaks the abstraction, but required because DriverMkDepend
283 -- needs to call the Finder. ToDo: untangle this.
284 sessionHscEnv :: Session -> IO HscEnv
285 sessionHscEnv (Session ref) = readIORef ref
287 withSession :: Session -> (HscEnv -> IO a) -> IO a
288 withSession (Session ref) f = do h <- readIORef ref; f h
290 modifySession :: Session -> (HscEnv -> HscEnv) -> IO ()
291 modifySession (Session ref) f = do h <- readIORef ref; writeIORef ref $! f h
293 -- -----------------------------------------------------------------------------
296 -- | Grabs the DynFlags from the Session
297 getSessionDynFlags :: Session -> IO DynFlags
298 getSessionDynFlags s = withSession s (return . hsc_dflags)
300 -- | Updates the DynFlags in a Session
301 setSessionDynFlags :: Session -> DynFlags -> IO ()
302 setSessionDynFlags s dflags = modifySession s (\h -> h{ hsc_dflags = dflags })
304 -- | Messages during compilation (eg. warnings and progress messages)
305 -- are reported using this callback. By default, these messages are
306 -- printed to stderr.
307 setMsgHandler :: (String -> IO ()) -> IO ()
308 setMsgHandler = ErrUtils.setMsgHandler
310 -- -----------------------------------------------------------------------------
313 -- ToDo: think about relative vs. absolute file paths. And what
314 -- happens when the current directory changes.
316 -- | Sets the targets for this session. Each target may be a module name
317 -- or a filename. The targets correspond to the set of root modules for
318 -- the program\/library. Unloading the current program is achieved by
319 -- setting the current set of targets to be empty, followed by load.
320 setTargets :: Session -> [Target] -> IO ()
321 setTargets s targets = modifySession s (\h -> h{ hsc_targets = targets })
323 -- | returns the current set of targets
324 getTargets :: Session -> IO [Target]
325 getTargets s = withSession s (return . hsc_targets)
327 -- | Add another target
328 addTarget :: Session -> Target -> IO ()
330 = modifySession s (\h -> h{ hsc_targets = target : hsc_targets h })
333 removeTarget :: Session -> TargetId -> IO ()
334 removeTarget s target_id
335 = modifySession s (\h -> h{ hsc_targets = filter (hsc_targets h) })
337 filter targets = [ t | t@(Target id _) <- targets, id /= target_id ]
339 -- Attempts to guess what Target a string refers to. This function implements
340 -- the --make/GHCi command-line syntax for filenames:
342 -- - if the string looks like a Haskell source filename, then interpret
344 -- - if adding a .hs or .lhs suffix yields the name of an existing file,
346 -- - otherwise interpret the string as a module name
348 guessTarget :: String -> IO Target
350 | isHaskellSrcFilename file
351 = return (Target (TargetFile file) Nothing)
353 = do exists <- doesFileExist hs_file
354 if exists then return (Target (TargetFile hs_file) Nothing) else do
355 exists <- doesFileExist lhs_file
356 if exists then return (Target (TargetFile lhs_file) Nothing) else do
357 return (Target (TargetModule (mkModule file)) Nothing)
359 hs_file = file ++ ".hs"
360 lhs_file = file ++ ".lhs"
362 -- -----------------------------------------------------------------------------
363 -- Loading the program
365 -- Perform a dependency analysis starting from the current targets
366 -- and update the session with the new module graph.
367 depanal :: Session -> [Module] -> IO ()
368 depanal (Session ref) excluded_mods = do
369 hsc_env <- readIORef ref
371 dflags = hsc_dflags hsc_env
372 gmode = ghcMode (hsc_dflags hsc_env)
373 targets = hsc_targets hsc_env
374 old_graph = hsc_mod_graph hsc_env
376 showPass dflags "Chasing dependencies"
377 when (gmode == BatchCompile) $
378 debugTraceMsg dflags 1 (showSDoc (hcat [
379 text "Chasing modules from: ",
380 hcat (punctuate comma (map pprTarget targets))]))
382 graph <- downsweep hsc_env old_graph excluded_mods
383 writeIORef ref hsc_env{ hsc_mod_graph=graph }
386 -- | The result of load.
388 = LoadOk Errors -- ^ all specified targets were loaded successfully.
389 | LoadFailed Errors -- ^ not all modules were loaded.
391 type Errors = [String]
393 data ErrMsg = ErrMsg {
394 errMsgSeverity :: Severity, -- warning, error, etc.
395 errMsgSpans :: [SrcSpan],
396 errMsgShortDoc :: Doc,
397 errMsgExtraInfo :: Doc
404 | LoadDependenciesOf Module
406 -- | Try to load the program. If a Module is supplied, then just
407 -- attempt to load up to this target. If no Module is supplied,
408 -- then try to load all targets.
409 load :: Session -> LoadHowMuch -> IO SuccessFlag
410 load session how_much =
411 loadMsgs session how_much ErrUtils.printErrorsAndWarnings
413 -- | Version of 'load' that takes a callback function to be invoked
414 -- on compiler errors and warnings as they occur during compilation.
415 loadMsgs :: Session -> LoadHowMuch -> (Messages-> IO ()) -> IO SuccessFlag
416 loadMsgs s@(Session ref) how_much msg_act
418 -- Dependency analysis first. Note that this fixes the module graph:
419 -- even if we don't get a fully successful upsweep, the full module
420 -- graph is still retained in the Session. We can tell which modules
421 -- were successfully loaded by inspecting the Session's HPT.
424 hsc_env <- readIORef ref
426 let hpt1 = hsc_HPT hsc_env
427 let dflags = hsc_dflags hsc_env
428 let mod_graph = hsc_mod_graph hsc_env
430 let ghci_mode = ghcMode (hsc_dflags hsc_env) -- this never changes
431 let verb = verbosity dflags
433 -- The "bad" boot modules are the ones for which we have
434 -- B.hs-boot in the module graph, but no B.hs
435 -- The downsweep should have ensured this does not happen
437 let all_home_mods = [ms_mod s | s <- mod_graph, not (isBootSummary s)]
438 bad_boot_mods = [s | s <- mod_graph, isBootSummary s,
439 not (ms_mod s `elem` all_home_mods)]
440 ASSERT( null bad_boot_mods ) return ()
442 -- mg2_with_srcimps drops the hi-boot nodes, returning a
443 -- graph with cycles. Among other things, it is used for
444 -- backing out partially complete cycles following a failed
445 -- upsweep, and for removing from hpt all the modules
446 -- not in strict downwards closure, during calls to compile.
447 let mg2_with_srcimps :: [SCC ModSummary]
448 mg2_with_srcimps = topSortModuleGraph True mod_graph Nothing
450 -- check the stability property for each module.
451 stable_mods@(stable_obj,stable_bco)
452 | BatchCompile <- ghci_mode = ([],[])
453 | otherwise = checkStability hpt1 mg2_with_srcimps all_home_mods
455 -- prune bits of the HPT which are definitely redundant now,
457 pruned_hpt = pruneHomePackageTable hpt1
458 (flattenSCCs mg2_with_srcimps)
463 debugTraceMsg dflags 2 (showSDoc (text "Stable obj:" <+> ppr stable_obj $$
464 text "Stable BCO:" <+> ppr stable_bco))
466 -- Unload any modules which are going to be re-linked this time around.
467 let stable_linkables = [ linkable
468 | m <- stable_obj++stable_bco,
469 Just hmi <- [lookupModuleEnv pruned_hpt m],
470 Just linkable <- [hm_linkable hmi] ]
471 unload hsc_env stable_linkables
473 -- We could at this point detect cycles which aren't broken by
474 -- a source-import, and complain immediately, but it seems better
475 -- to let upsweep_mods do this, so at least some useful work gets
476 -- done before the upsweep is abandoned.
477 --hPutStrLn stderr "after tsort:\n"
478 --hPutStrLn stderr (showSDoc (vcat (map ppr mg2)))
480 -- Now do the upsweep, calling compile for each module in
481 -- turn. Final result is version 3 of everything.
483 -- Topologically sort the module graph, this time including hi-boot
484 -- nodes, and possibly just including the portion of the graph
485 -- reachable from the module specified in the 2nd argument to load.
486 -- This graph should be cycle-free.
487 -- If we're restricting the upsweep to a portion of the graph, we
488 -- also want to retain everything that is still stable.
489 let full_mg :: [SCC ModSummary]
490 full_mg = topSortModuleGraph False mod_graph Nothing
492 maybe_top_mod = case how_much of
494 LoadDependenciesOf m -> Just m
497 partial_mg0 :: [SCC ModSummary]
498 partial_mg0 = topSortModuleGraph False mod_graph maybe_top_mod
500 -- LoadDependenciesOf m: we want the upsweep to stop just
501 -- short of the specified module (unless the specified module
504 | LoadDependenciesOf mod <- how_much
505 = ASSERT( case last partial_mg0 of
506 AcyclicSCC ms -> ms_mod ms == mod; _ -> False )
507 List.init partial_mg0
513 | AcyclicSCC ms <- full_mg,
514 ms_mod ms `elem` stable_obj++stable_bco,
515 ms_mod ms `notElem` [ ms_mod ms' |
516 AcyclicSCC ms' <- partial_mg ] ]
518 mg = stable_mg ++ partial_mg
520 -- clean up between compilations
521 let cleanup = cleanTempFilesExcept dflags
522 (ppFilesFromSummaries (flattenSCCs mg2_with_srcimps))
524 (upsweep_ok, hsc_env1, modsUpswept)
525 <- upsweep (hsc_env { hsc_HPT = emptyHomePackageTable })
526 pruned_hpt stable_mods cleanup msg_act mg
528 -- Make modsDone be the summaries for each home module now
529 -- available; this should equal the domain of hpt3.
530 -- Get in in a roughly top .. bottom order (hence reverse).
532 let modsDone = reverse modsUpswept
534 -- Try and do linking in some form, depending on whether the
535 -- upsweep was completely or only partially successful.
537 if succeeded upsweep_ok
540 -- Easy; just relink it all.
541 do debugTraceMsg dflags 2 "Upsweep completely successful."
543 -- Clean up after ourselves
544 cleanTempFilesExcept dflags (ppFilesFromSummaries modsDone)
546 -- Issue a warning for the confusing case where the user
547 -- said '-o foo' but we're not going to do any linking.
548 -- We attempt linking if either (a) one of the modules is
549 -- called Main, or (b) the user said -no-hs-main, indicating
550 -- that main() is going to come from somewhere else.
552 let ofile = outputFile dflags
553 let no_hs_main = dopt Opt_NoHsMain dflags
554 let mb_main_mod = mainModIs dflags
556 main_mod = mb_main_mod `orElse` "Main"
558 = any ((==main_mod).moduleUserString.ms_mod)
560 do_linking = a_root_is_Main || no_hs_main
562 when (ghci_mode == BatchCompile && isJust ofile && not do_linking) $
563 debugTraceMsg dflags 1 ("Warning: output was redirected with -o, " ++
564 "but no output will be generated\n" ++
565 "because there is no " ++ main_mod ++ " module.")
567 -- link everything together
568 linkresult <- link ghci_mode dflags do_linking (hsc_HPT hsc_env1)
570 loadFinish Succeeded linkresult ref hsc_env1
573 -- Tricky. We need to back out the effects of compiling any
574 -- half-done cycles, both so as to clean up the top level envs
575 -- and to avoid telling the interactive linker to link them.
576 do debugTraceMsg dflags 2 "Upsweep partially successful."
579 = map ms_mod modsDone
580 let mods_to_zap_names
581 = findPartiallyCompletedCycles modsDone_names
584 = filter ((`notElem` mods_to_zap_names).ms_mod)
587 let hpt4 = retainInTopLevelEnvs (map ms_mod mods_to_keep)
590 -- Clean up after ourselves
591 cleanTempFilesExcept dflags (ppFilesFromSummaries mods_to_keep)
593 -- there should be no Nothings where linkables should be, now
594 ASSERT(all (isJust.hm_linkable)
595 (moduleEnvElts (hsc_HPT hsc_env))) do
597 -- Link everything together
598 linkresult <- link ghci_mode dflags False hpt4
600 let hsc_env4 = hsc_env1{ hsc_HPT = hpt4 }
601 loadFinish Failed linkresult ref hsc_env4
603 -- Finish up after a load.
605 -- If the link failed, unload everything and return.
606 loadFinish all_ok Failed ref hsc_env
607 = do unload hsc_env []
608 writeIORef ref $! discardProg hsc_env
611 -- Empty the interactive context and set the module context to the topmost
612 -- newly loaded module, or the Prelude if none were loaded.
613 loadFinish all_ok Succeeded ref hsc_env
614 = do writeIORef ref $! hsc_env{ hsc_IC = emptyInteractiveContext }
618 -- Forget the current program, but retain the persistent info in HscEnv
619 discardProg :: HscEnv -> HscEnv
621 = hsc_env { hsc_mod_graph = emptyMG,
622 hsc_IC = emptyInteractiveContext,
623 hsc_HPT = emptyHomePackageTable }
625 -- used to fish out the preprocess output files for the purposes of
626 -- cleaning up. The preprocessed file *might* be the same as the
627 -- source file, but that doesn't do any harm.
628 ppFilesFromSummaries summaries = [ fn | Just fn <- map ms_hspp_file summaries ]
630 -- -----------------------------------------------------------------------------
634 CheckedModule { parsedSource :: ParsedSource,
635 -- ToDo: renamedSource
636 typecheckedSource :: Maybe TypecheckedSource,
637 checkedModuleInfo :: Maybe ModuleInfo
640 type ParsedSource = Located (HsModule RdrName)
641 type TypecheckedSource = LHsBinds Id
643 -- | This is the way to get access to parsed and typechecked source code
644 -- for a module. 'checkModule' loads all the dependencies of the specified
645 -- module in the Session, and then attempts to typecheck the module. If
646 -- successful, it returns the abstract syntax for the module.
647 checkModule :: Session -> Module -> (Messages -> IO ())
648 -> IO (Maybe CheckedModule)
649 checkModule session@(Session ref) mod msg_act = do
650 -- load up the dependencies first
651 r <- loadMsgs session (LoadDependenciesOf mod) msg_act
652 if (failed r) then return Nothing else do
654 -- now parse & typecheck the module
655 hsc_env <- readIORef ref
656 let mg = hsc_mod_graph hsc_env
657 case [ ms | ms <- mg, ms_mod ms == mod ] of
660 -- Add in the OPTIONS from the source file This is nasty:
661 -- we've done this once already, in the compilation manager
662 -- It might be better to cache the flags in the
663 -- ml_hspp_file field, say
664 let dflags0 = hsc_dflags hsc_env
665 hspp_buf = expectJust "GHC.checkModule" (ms_hspp_buf ms)
666 opts = getOptionsFromStringBuffer hspp_buf
667 (dflags1,leftovers) <- parseDynamicFlags dflags0 (map snd opts)
668 if (not (null leftovers))
669 then do let filename = fromJust (ml_hs_file (ms_location ms))
670 msg_act (optionsErrorMsgs leftovers opts filename)
674 r <- hscFileCheck hsc_env{hsc_dflags=dflags1} msg_act ms
678 HscChecked parsed Nothing ->
679 return (Just (CheckedModule parsed Nothing Nothing))
680 HscChecked parsed (Just (tc_binds, rdr_env, details)) -> do
681 let minf = ModuleInfo {
682 minf_details = details,
683 minf_rdr_env = Just rdr_env
685 return (Just (CheckedModule {
686 parsedSource = parsed,
687 typecheckedSource = Just tc_binds,
688 checkedModuleInfo = Just minf }))
690 -- ---------------------------------------------------------------------------
693 unload :: HscEnv -> [Linkable] -> IO ()
694 unload hsc_env stable_linkables -- Unload everthing *except* 'stable_linkables'
695 = case ghcMode (hsc_dflags hsc_env) of
696 BatchCompile -> return ()
697 JustTypecheck -> return ()
699 Interactive -> Linker.unload (hsc_dflags hsc_env) stable_linkables
701 Interactive -> panic "unload: no interpreter"
703 other -> panic "unload: strange mode"
705 -- -----------------------------------------------------------------------------
709 Stability tells us which modules definitely do not need to be recompiled.
710 There are two main reasons for having stability:
712 - avoid doing a complete upsweep of the module graph in GHCi when
713 modules near the bottom of the tree have not changed.
715 - to tell GHCi when it can load object code: we can only load object code
716 for a module when we also load object code fo all of the imports of the
717 module. So we need to know that we will definitely not be recompiling
718 any of these modules, and we can use the object code.
720 NB. stability is of no importance to BatchCompile at all, only Interactive.
721 (ToDo: what about JustTypecheck?)
723 The stability check is as follows. Both stableObject and
724 stableBCO are used during the upsweep phase later.
727 stable m = stableObject m || stableBCO m
730 all stableObject (imports m)
731 && old linkable does not exist, or is == on-disk .o
732 && date(on-disk .o) > date(.hs)
735 all stable (imports m)
736 && date(BCO) > date(.hs)
739 These properties embody the following ideas:
741 - if a module is stable:
742 - if it has been compiled in a previous pass (present in HPT)
743 then it does not need to be compiled or re-linked.
744 - if it has not been compiled in a previous pass,
745 then we only need to read its .hi file from disk and
746 link it to produce a ModDetails.
748 - if a modules is not stable, we will definitely be at least
749 re-linking, and possibly re-compiling it during the upsweep.
750 All non-stable modules can (and should) therefore be unlinked
753 - Note that objects are only considered stable if they only depend
754 on other objects. We can't link object code against byte code.
758 :: HomePackageTable -- HPT from last compilation
759 -> [SCC ModSummary] -- current module graph (cyclic)
760 -> [Module] -- all home modules
761 -> ([Module], -- stableObject
762 [Module]) -- stableBCO
764 checkStability hpt sccs all_home_mods = foldl checkSCC ([],[]) sccs
766 checkSCC (stable_obj, stable_bco) scc0
767 | stableObjects = (scc_mods ++ stable_obj, stable_bco)
768 | stableBCOs = (stable_obj, scc_mods ++ stable_bco)
769 | otherwise = (stable_obj, stable_bco)
771 scc = flattenSCC scc0
772 scc_mods = map ms_mod scc
773 home_module m = m `elem` all_home_mods && m `notElem` scc_mods
775 scc_allimps = nub (filter home_module (concatMap ms_allimps scc))
776 -- all imports outside the current SCC, but in the home pkg
778 stable_obj_imps = map (`elem` stable_obj) scc_allimps
779 stable_bco_imps = map (`elem` stable_bco) scc_allimps
786 and (zipWith (||) stable_obj_imps stable_bco_imps)
790 | Just t <- ms_obj_date ms = t >= ms_hs_date ms
794 same_as_prev t = case lookupModuleEnv hpt (ms_mod ms) of
796 Just hmi | Just l <- hm_linkable hmi
797 -> isObjectLinkable l && t == linkableTime l
798 -- why '>=' rather than '>' above? If the filesystem stores
799 -- times to the nearset second, we may occasionally find that
800 -- the object & source have the same modification time,
801 -- especially if the source was automatically generated
802 -- and compiled. Using >= is slightly unsafe, but it matches
806 = case lookupModuleEnv hpt (ms_mod ms) of
808 Just hmi | Just l <- hm_linkable hmi ->
809 not (isObjectLinkable l) &&
810 linkableTime l >= ms_hs_date ms
812 ms_allimps :: ModSummary -> [Module]
813 ms_allimps ms = ms_srcimps ms ++ ms_imps ms
815 -- -----------------------------------------------------------------------------
816 -- Prune the HomePackageTable
818 -- Before doing an upsweep, we can throw away:
820 -- - For non-stable modules:
821 -- - all ModDetails, all linked code
822 -- - all unlinked code that is out of date with respect to
825 -- This is VERY IMPORTANT otherwise we'll end up requiring 2x the
826 -- space at the end of the upsweep, because the topmost ModDetails of the
827 -- old HPT holds on to the entire type environment from the previous
830 pruneHomePackageTable
833 -> ([Module],[Module])
836 pruneHomePackageTable hpt summ (stable_obj, stable_bco)
837 = mapModuleEnv prune hpt
839 | is_stable modl = hmi'
840 | otherwise = hmi'{ hm_details = emptyModDetails }
842 modl = mi_module (hm_iface hmi)
843 hmi' | Just l <- hm_linkable hmi, linkableTime l < ms_hs_date ms
844 = hmi{ hm_linkable = Nothing }
847 where ms = expectJust "prune" (lookupModuleEnv ms_map modl)
849 ms_map = mkModuleEnv [(ms_mod ms, ms) | ms <- summ]
851 is_stable m = m `elem` stable_obj || m `elem` stable_bco
853 -- -----------------------------------------------------------------------------
855 -- Return (names of) all those in modsDone who are part of a cycle
856 -- as defined by theGraph.
857 findPartiallyCompletedCycles :: [Module] -> [SCC ModSummary] -> [Module]
858 findPartiallyCompletedCycles modsDone theGraph
862 chew ((AcyclicSCC v):rest) = chew rest -- acyclic? not interesting.
863 chew ((CyclicSCC vs):rest)
864 = let names_in_this_cycle = nub (map ms_mod vs)
866 = nub ([done | done <- modsDone,
867 done `elem` names_in_this_cycle])
868 chewed_rest = chew rest
870 if notNull mods_in_this_cycle
871 && length mods_in_this_cycle < length names_in_this_cycle
872 then mods_in_this_cycle ++ chewed_rest
875 -- -----------------------------------------------------------------------------
878 -- This is where we compile each module in the module graph, in a pass
879 -- from the bottom to the top of the graph.
881 -- There better had not be any cyclic groups here -- we check for them.
884 :: HscEnv -- Includes initially-empty HPT
885 -> HomePackageTable -- HPT from last time round (pruned)
886 -> ([Module],[Module]) -- stable modules (see checkStability)
887 -> IO () -- How to clean up unwanted tmp files
888 -> (Messages -> IO ()) -- Compiler error message callback
889 -> [SCC ModSummary] -- Mods to do (the worklist)
891 HscEnv, -- With an updated HPT
892 [ModSummary]) -- Mods which succeeded
894 upsweep hsc_env old_hpt stable_mods cleanup msg_act mods
895 = upsweep' hsc_env old_hpt stable_mods cleanup msg_act mods 1 (length mods)
897 upsweep' hsc_env old_hpt stable_mods cleanup msg_act
899 = return (Succeeded, hsc_env, [])
901 upsweep' hsc_env old_hpt stable_mods cleanup msg_act
903 = do putMsg (showSDoc (cyclicModuleErr ms))
904 return (Failed, hsc_env, [])
906 upsweep' hsc_env old_hpt stable_mods cleanup msg_act
907 (AcyclicSCC mod:mods) mod_index nmods
908 = do -- putStrLn ("UPSWEEP_MOD: hpt = " ++
909 -- show (map (moduleUserString.moduleName.mi_module.hm_iface)
910 -- (moduleEnvElts (hsc_HPT hsc_env)))
912 mb_mod_info <- upsweep_mod hsc_env old_hpt stable_mods msg_act mod
915 cleanup -- Remove unwanted tmp files between compilations
918 Nothing -> return (Failed, hsc_env, [])
920 { let this_mod = ms_mod mod
922 -- Add new info to hsc_env
923 hpt1 = extendModuleEnv (hsc_HPT hsc_env)
925 hsc_env1 = hsc_env { hsc_HPT = hpt1 }
927 -- Space-saving: delete the old HPT entry
928 -- for mod BUT if mod is a hs-boot
929 -- node, don't delete it. For the
930 -- interface, the HPT entry is probaby for the
931 -- main Haskell source file. Deleting it
932 -- would force .. (what?? --SDM)
933 old_hpt1 | isBootSummary mod = old_hpt
934 | otherwise = delModuleEnv old_hpt this_mod
936 ; (restOK, hsc_env2, modOKs)
937 <- upsweep' hsc_env1 old_hpt1 stable_mods cleanup
938 msg_act mods (mod_index+1) nmods
939 ; return (restOK, hsc_env2, mod:modOKs)
943 -- Compile a single module. Always produce a Linkable for it if
944 -- successful. If no compilation happened, return the old Linkable.
945 upsweep_mod :: HscEnv
947 -> ([Module],[Module])
948 -> (Messages -> IO ())
950 -> Int -- index of module
951 -> Int -- total number of modules
952 -> IO (Maybe HomeModInfo) -- Nothing => Failed
954 upsweep_mod hsc_env old_hpt (stable_obj, stable_bco) msg_act summary mod_index nmods
957 this_mod = ms_mod summary
958 mb_obj_date = ms_obj_date summary
959 obj_fn = ml_obj_file (ms_location summary)
960 hs_date = ms_hs_date summary
962 compile_it :: Maybe Linkable -> IO (Maybe HomeModInfo)
963 compile_it = upsweep_compile hsc_env old_hpt this_mod
964 msg_act summary mod_index nmods
966 case ghcMode (hsc_dflags hsc_env) of
969 -- Batch-compilating is easy: just check whether we have
970 -- an up-to-date object file. If we do, then the compiler
971 -- needs to do a recompilation check.
972 _ | Just obj_date <- mb_obj_date, obj_date >= hs_date -> do
974 findObjectLinkable this_mod obj_fn obj_date
975 compile_it (Just linkable)
982 _ | is_stable_obj, isJust old_hmi ->
984 -- object is stable, and we have an entry in the
985 -- old HPT: nothing to do
987 | is_stable_obj, isNothing old_hmi -> do
989 findObjectLinkable this_mod obj_fn
990 (expectJust "upseep1" mb_obj_date)
991 compile_it (Just linkable)
992 -- object is stable, but we need to load the interface
993 -- off disk to make a HMI.
996 ASSERT(isJust old_hmi) -- must be in the old_hpt
998 -- BCO is stable: nothing to do
1000 | Just hmi <- old_hmi,
1001 Just l <- hm_linkable hmi, not (isObjectLinkable l),
1002 linkableTime l >= ms_hs_date summary ->
1004 -- we have an old BCO that is up to date with respect
1005 -- to the source: do a recompilation check as normal.
1009 -- no existing code at all: we must recompile.
1011 is_stable_obj = this_mod `elem` stable_obj
1012 is_stable_bco = this_mod `elem` stable_bco
1014 old_hmi = lookupModuleEnv old_hpt this_mod
1016 -- Run hsc to compile a module
1017 upsweep_compile hsc_env old_hpt this_mod msg_act summary
1019 mb_old_linkable = do
1021 -- The old interface is ok if it's in the old HPT
1022 -- a) we're compiling a source file, and the old HPT
1023 -- entry is for a source file
1024 -- b) we're compiling a hs-boot file
1025 -- Case (b) allows an hs-boot file to get the interface of its
1026 -- real source file on the second iteration of the compilation
1027 -- manager, but that does no harm. Otherwise the hs-boot file
1028 -- will always be recompiled
1031 = case lookupModuleEnv old_hpt this_mod of
1033 Just hm_info | isBootSummary summary -> Just iface
1034 | not (mi_boot iface) -> Just iface
1035 | otherwise -> Nothing
1037 iface = hm_iface hm_info
1039 compresult <- compile hsc_env msg_act summary mb_old_linkable mb_old_iface
1043 -- Compilation failed. Compile may still have updated the PCS, tho.
1044 CompErrs -> return Nothing
1046 -- Compilation "succeeded", and may or may not have returned a new
1047 -- linkable (depending on whether compilation was actually performed
1049 CompOK new_details new_iface new_linkable
1050 -> do let new_info = HomeModInfo { hm_iface = new_iface,
1051 hm_details = new_details,
1052 hm_linkable = new_linkable }
1053 return (Just new_info)
1056 -- Filter modules in the HPT
1057 retainInTopLevelEnvs :: [Module] -> HomePackageTable -> HomePackageTable
1058 retainInTopLevelEnvs keep_these hpt
1059 = mkModuleEnv [ (mod, expectJust "retain" mb_mod_info)
1061 , let mb_mod_info = lookupModuleEnv hpt mod
1062 , isJust mb_mod_info ]
1064 -- ---------------------------------------------------------------------------
1065 -- Topological sort of the module graph
1068 :: Bool -- Drop hi-boot nodes? (see below)
1072 -- Calculate SCCs of the module graph, possibly dropping the hi-boot nodes
1073 -- The resulting list of strongly-connected-components is in topologically
1074 -- sorted order, starting with the module(s) at the bottom of the
1075 -- dependency graph (ie compile them first) and ending with the ones at
1078 -- Drop hi-boot nodes (first boolean arg)?
1080 -- False: treat the hi-boot summaries as nodes of the graph,
1081 -- so the graph must be acyclic
1083 -- True: eliminate the hi-boot nodes, and instead pretend
1084 -- the a source-import of Foo is an import of Foo
1085 -- The resulting graph has no hi-boot nodes, but can by cyclic
1087 topSortModuleGraph drop_hs_boot_nodes summaries Nothing
1088 = stronglyConnComp (fst (moduleGraphNodes drop_hs_boot_nodes summaries))
1089 topSortModuleGraph drop_hs_boot_nodes summaries (Just mod)
1090 = stronglyConnComp (map vertex_fn (reachable graph root))
1092 -- restrict the graph to just those modules reachable from
1093 -- the specified module. We do this by building a graph with
1094 -- the full set of nodes, and determining the reachable set from
1095 -- the specified node.
1096 (nodes, lookup_key) = moduleGraphNodes drop_hs_boot_nodes summaries
1097 (graph, vertex_fn, key_fn) = graphFromEdges' nodes
1099 | Just key <- lookup_key HsSrcFile mod, Just v <- key_fn key = v
1100 | otherwise = throwDyn (ProgramError "module does not exist")
1102 moduleGraphNodes :: Bool -> [ModSummary]
1103 -> ([(ModSummary, Int, [Int])], HscSource -> Module -> Maybe Int)
1104 moduleGraphNodes drop_hs_boot_nodes summaries = (nodes, lookup_key)
1106 -- Drop hs-boot nodes by using HsSrcFile as the key
1107 hs_boot_key | drop_hs_boot_nodes = HsSrcFile
1108 | otherwise = HsBootFile
1110 -- We use integers as the keys for the SCC algorithm
1111 nodes :: [(ModSummary, Int, [Int])]
1112 nodes = [(s, expectJust "topSort" (lookup_key (ms_hsc_src s) (ms_mod s)),
1113 out_edge_keys hs_boot_key (ms_srcimps s) ++
1114 out_edge_keys HsSrcFile (ms_imps s) )
1116 , not (isBootSummary s && drop_hs_boot_nodes) ]
1117 -- Drop the hi-boot ones if told to do so
1119 key_map :: NodeMap Int
1120 key_map = listToFM ([(ms_mod s, ms_hsc_src s) | s <- summaries]
1123 lookup_key :: HscSource -> Module -> Maybe Int
1124 lookup_key hs_src mod = lookupFM key_map (mod, hs_src)
1126 out_edge_keys :: HscSource -> [Module] -> [Int]
1127 out_edge_keys hi_boot ms = mapCatMaybes (lookup_key hi_boot) ms
1128 -- If we want keep_hi_boot_nodes, then we do lookup_key with
1129 -- the IsBootInterface parameter True; else False
1132 type NodeKey = (Module, HscSource) -- The nodes of the graph are
1133 type NodeMap a = FiniteMap NodeKey a -- keyed by (mod, src_file_type) pairs
1135 msKey :: ModSummary -> NodeKey
1136 msKey (ModSummary { ms_mod = mod, ms_hsc_src = boot }) = (mod,boot)
1138 emptyNodeMap :: NodeMap a
1139 emptyNodeMap = emptyFM
1141 mkNodeMap :: [ModSummary] -> NodeMap ModSummary
1142 mkNodeMap summaries = listToFM [ (msKey s, s) | s <- summaries]
1144 nodeMapElts :: NodeMap a -> [a]
1145 nodeMapElts = eltsFM
1147 -- -----------------------------------------------------------------
1148 -- The unlinked image
1150 -- The compilation manager keeps a list of compiled, but as-yet unlinked
1151 -- binaries (byte code or object code). Even when it links bytecode
1152 -- it keeps the unlinked version so it can re-link it later without
1155 type UnlinkedImage = [Linkable] -- the unlinked images (should be a set, really)
1157 findModuleLinkable_maybe :: [Linkable] -> Module -> Maybe Linkable
1158 findModuleLinkable_maybe lis mod
1159 = case [LM time nm us | LM time nm us <- lis, nm == mod] of
1162 many -> pprPanic "findModuleLinkable" (ppr mod)
1164 delModuleLinkable :: [Linkable] -> Module -> [Linkable]
1165 delModuleLinkable ls mod = [ l | l@(LM _ nm _) <- ls, nm /= mod ]
1167 -----------------------------------------------------------------------------
1168 -- Downsweep (dependency analysis)
1170 -- Chase downwards from the specified root set, returning summaries
1171 -- for all home modules encountered. Only follow source-import
1174 -- We pass in the previous collection of summaries, which is used as a
1175 -- cache to avoid recalculating a module summary if the source is
1178 -- The returned list of [ModSummary] nodes has one node for each home-package
1179 -- module, plus one for any hs-boot files. The imports of these nodes
1180 -- are all there, including the imports of non-home-package modules.
1183 -> [ModSummary] -- Old summaries
1184 -> [Module] -- Ignore dependencies on these; treat them as
1185 -- if they were package modules
1187 downsweep hsc_env old_summaries excl_mods
1188 = do rootSummaries <- mapM getRootSummary roots
1189 checkDuplicates rootSummaries
1190 loop (concatMap msDeps rootSummaries)
1191 (mkNodeMap rootSummaries)
1193 roots = hsc_targets hsc_env
1195 old_summary_map :: NodeMap ModSummary
1196 old_summary_map = mkNodeMap old_summaries
1198 getRootSummary :: Target -> IO ModSummary
1199 getRootSummary (Target (TargetFile file) maybe_buf)
1200 = do exists <- doesFileExist file
1201 if exists then summariseFile hsc_env file maybe_buf else do
1202 throwDyn (CmdLineError ("can't find file: " ++ file))
1203 getRootSummary (Target (TargetModule modl) maybe_buf)
1204 = do maybe_summary <- summarise hsc_env emptyNodeMap Nothing False
1205 modl maybe_buf excl_mods
1206 case maybe_summary of
1207 Nothing -> packageModErr modl
1210 -- In a root module, the filename is allowed to diverge from the module
1211 -- name, so we have to check that there aren't multiple root files
1212 -- defining the same module (otherwise the duplicates will be silently
1213 -- ignored, leading to confusing behaviour).
1214 checkDuplicates :: [ModSummary] -> IO ()
1215 checkDuplicates summaries = mapM_ check summaries
1220 many -> multiRootsErr modl many
1221 where modl = ms_mod summ
1223 [ expectJust "checkDup" (ml_hs_file (ms_location summ'))
1224 | summ' <- summaries, ms_mod summ' == modl ]
1226 loop :: [(FilePath,Module,IsBootInterface)]
1227 -- Work list: process these modules
1228 -> NodeMap ModSummary
1231 -- The result includes the worklist, except
1232 -- for those mentioned in the visited set
1233 loop [] done = return (nodeMapElts done)
1234 loop ((cur_path, wanted_mod, is_boot) : ss) done
1235 | key `elemFM` done = loop ss done
1236 | otherwise = do { mb_s <- summarise hsc_env old_summary_map
1237 (Just cur_path) is_boot
1238 wanted_mod Nothing excl_mods
1240 Nothing -> loop ss done
1241 Just s -> loop (msDeps s ++ ss)
1242 (addToFM done key s) }
1244 key = (wanted_mod, if is_boot then HsBootFile else HsSrcFile)
1246 msDeps :: ModSummary -> [(FilePath, -- Importing module
1247 Module, -- Imported module
1248 IsBootInterface)] -- {-# SOURCE #-} import or not
1249 -- (msDeps s) returns the dependencies of the ModSummary s.
1250 -- A wrinkle is that for a {-# SOURCE #-} import we return
1251 -- *both* the hs-boot file
1252 -- *and* the source file
1253 -- as "dependencies". That ensures that the list of all relevant
1254 -- modules always contains B.hs if it contains B.hs-boot.
1255 -- Remember, this pass isn't doing the topological sort. It's
1256 -- just gathering the list of all relevant ModSummaries
1257 msDeps s = concat [ [(f, m, True), (f,m,False)] | m <- ms_srcimps s]
1258 ++ [(f,m,False) | m <- ms_imps s]
1260 f = msHsFilePath s -- Keep the importing module for error reporting
1263 -----------------------------------------------------------------------------
1264 -- Summarising modules
1266 -- We have two types of summarisation:
1268 -- * Summarise a file. This is used for the root module(s) passed to
1269 -- cmLoadModules. The file is read, and used to determine the root
1270 -- module name. The module name may differ from the filename.
1272 -- * Summarise a module. We are given a module name, and must provide
1273 -- a summary. The finder is used to locate the file in which the module
1276 summariseFile :: HscEnv -> FilePath
1277 -> Maybe (StringBuffer,ClockTime)
1279 -- Used for Haskell source only, I think
1280 -- We know the file name, and we know it exists,
1281 -- but we don't necessarily know the module name (might differ)
1282 summariseFile hsc_env file maybe_buf
1283 = do let dflags = hsc_dflags hsc_env
1285 (dflags', hspp_fn, buf)
1286 <- preprocessFile dflags file maybe_buf
1288 (srcimps,the_imps,mod) <- getImports dflags' buf hspp_fn
1290 -- Make a ModLocation for this file
1291 location <- mkHomeModLocation dflags mod file
1293 -- Tell the Finder cache where it is, so that subsequent calls
1294 -- to findModule will find it, even if it's not on any search path
1295 addHomeModuleToFinder hsc_env mod location
1297 src_timestamp <- case maybe_buf of
1298 Just (_,t) -> return t
1299 Nothing -> getModificationTime file
1301 obj_timestamp <- modificationTimeIfExists (ml_obj_file location)
1303 return (ModSummary { ms_mod = mod, ms_hsc_src = HsSrcFile,
1304 ms_location = location,
1305 ms_hspp_file = Just hspp_fn,
1306 ms_hspp_buf = Just buf,
1307 ms_srcimps = srcimps, ms_imps = the_imps,
1308 ms_hs_date = src_timestamp,
1309 ms_obj_date = obj_timestamp })
1311 -- Summarise a module, and pick up source and timestamp.
1313 -> NodeMap ModSummary -- Map of old summaries
1314 -> Maybe FilePath -- Importing module (for error messages)
1315 -> IsBootInterface -- True <=> a {-# SOURCE #-} import
1316 -> Module -- Imported module to be summarised
1317 -> Maybe (StringBuffer, ClockTime)
1318 -> [Module] -- Modules to exclude
1319 -> IO (Maybe ModSummary) -- Its new summary
1321 summarise hsc_env old_summary_map cur_mod is_boot wanted_mod maybe_buf excl_mods
1322 | wanted_mod `elem` excl_mods
1325 | Just old_summary <- lookupFM old_summary_map (wanted_mod, hsc_src)
1326 = do -- Find its new timestamp; all the
1327 -- ModSummaries in the old map have valid ml_hs_files
1328 let location = ms_location old_summary
1329 src_fn = expectJust "summarise" (ml_hs_file location)
1331 -- return the cached summary if the source didn't change
1332 src_timestamp <- case maybe_buf of
1333 Just (_,t) -> return t
1334 Nothing -> getModificationTime src_fn
1336 if ms_hs_date old_summary == src_timestamp
1337 then do -- update the object-file timestamp
1338 obj_timestamp <- getObjTimestamp location is_boot
1339 return (Just old_summary{ ms_obj_date = obj_timestamp })
1341 -- source changed: re-summarise
1342 new_summary location src_fn maybe_buf src_timestamp
1345 = do found <- findModule hsc_env wanted_mod True {-explicit-}
1348 | not (isHomePackage pkg) -> return Nothing
1349 -- Drop external-pkg
1350 | isJust (ml_hs_file location) -> just_found location
1352 err -> noModError dflags cur_mod wanted_mod err
1355 dflags = hsc_dflags hsc_env
1357 hsc_src = if is_boot then HsBootFile else HsSrcFile
1359 just_found location = do
1360 -- Adjust location to point to the hs-boot source file,
1361 -- hi file, object file, when is_boot says so
1362 let location' | is_boot = addBootSuffixLocn location
1363 | otherwise = location
1364 src_fn = expectJust "summarise2" (ml_hs_file location')
1366 -- Check that it exists
1367 -- It might have been deleted since the Finder last found it
1368 maybe_t <- modificationTimeIfExists src_fn
1370 Nothing -> noHsFileErr cur_mod src_fn
1371 Just t -> new_summary location' src_fn Nothing t
1374 new_summary location src_fn maybe_bug src_timestamp
1376 -- Preprocess the source file and get its imports
1377 -- The dflags' contains the OPTIONS pragmas
1378 (dflags', hspp_fn, buf) <- preprocessFile dflags src_fn maybe_buf
1379 (srcimps, the_imps, mod_name) <- getImports dflags' buf hspp_fn
1381 when (mod_name /= wanted_mod) $
1382 throwDyn (ProgramError
1383 (showSDoc (text src_fn
1384 <> text ": file name does not match module name"
1385 <+> quotes (ppr mod_name))))
1387 -- Find the object timestamp, and return the summary
1388 obj_timestamp <- getObjTimestamp location is_boot
1390 return (Just ( ModSummary { ms_mod = wanted_mod,
1391 ms_hsc_src = hsc_src,
1392 ms_location = location,
1393 ms_hspp_file = Just hspp_fn,
1394 ms_hspp_buf = Just buf,
1395 ms_srcimps = srcimps,
1397 ms_hs_date = src_timestamp,
1398 ms_obj_date = obj_timestamp }))
1401 getObjTimestamp location is_boot
1402 = if is_boot then return Nothing
1403 else modificationTimeIfExists (ml_obj_file location)
1406 preprocessFile :: DynFlags -> FilePath -> Maybe (StringBuffer,ClockTime)
1407 -> IO (DynFlags, FilePath, StringBuffer)
1408 preprocessFile dflags src_fn Nothing
1410 (dflags', hspp_fn) <- preprocess dflags src_fn
1411 buf <- hGetStringBuffer hspp_fn
1412 return (dflags', hspp_fn, buf)
1414 preprocessFile dflags src_fn (Just (buf, time))
1416 -- case we bypass the preprocessing stage?
1418 local_opts = getOptionsFromStringBuffer buf
1420 (dflags', errs) <- parseDynamicFlags dflags (map snd local_opts)
1424 | Unlit _ <- startPhase src_fn = True
1425 -- note: local_opts is only required if there's no Unlit phase
1426 | dopt Opt_Cpp dflags' = True
1427 | dopt Opt_Pp dflags' = True
1430 when needs_preprocessing $
1431 ghcError (ProgramError "buffer needs preprocesing; interactive check disabled")
1433 return (dflags', src_fn, buf)
1436 -----------------------------------------------------------------------------
1438 -----------------------------------------------------------------------------
1440 noModError :: DynFlags -> Maybe FilePath -> Module -> FindResult -> IO ab
1441 -- ToDo: we don't have a proper line number for this error
1442 noModError dflags cur_mod wanted_mod err
1443 = throwDyn $ ProgramError $ showSDoc $
1444 vcat [cantFindError dflags wanted_mod err,
1445 nest 2 (parens (pp_where cur_mod))]
1447 noHsFileErr cur_mod path
1448 = throwDyn $ CmdLineError $ showSDoc $
1449 vcat [text "Can't find" <+> text path,
1450 nest 2 (parens (pp_where cur_mod))]
1452 pp_where Nothing = text "one of the roots of the dependency analysis"
1453 pp_where (Just p) = text "imported from" <+> text p
1456 = throwDyn (CmdLineError (showSDoc (text "module" <+>
1457 quotes (ppr mod) <+>
1458 text "is a package module")))
1460 multiRootsErr mod files
1461 = throwDyn (ProgramError (showSDoc (
1462 text "module" <+> quotes (ppr mod) <+>
1463 text "is defined in multiple files:" <+>
1464 sep (map text files))))
1466 cyclicModuleErr :: [ModSummary] -> SDoc
1468 = hang (ptext SLIT("Module imports form a cycle for modules:"))
1469 2 (vcat (map show_one ms))
1471 show_one ms = sep [ show_mod (ms_hsc_src ms) (ms_mod ms),
1472 nest 2 $ ptext SLIT("imports:") <+>
1473 (pp_imps HsBootFile (ms_srcimps ms)
1474 $$ pp_imps HsSrcFile (ms_imps ms))]
1475 show_mod hsc_src mod = ppr mod <> text (hscSourceString hsc_src)
1476 pp_imps src mods = fsep (map (show_mod src) mods)
1479 -- | Inform GHC that the working directory has changed. GHC will flush
1480 -- its cache of module locations, since it may no longer be valid.
1481 -- Note: if you change the working directory, you should also unload
1482 -- the current program (set targets to empty, followed by load).
1483 workingDirectoryChanged :: Session -> IO ()
1484 workingDirectoryChanged s = withSession s $ \hsc_env ->
1485 flushFinderCache (hsc_FC hsc_env)
1487 -- -----------------------------------------------------------------------------
1488 -- inspecting the session
1490 -- | Get the module dependency graph.
1491 getModuleGraph :: Session -> IO ModuleGraph -- ToDo: DiGraph ModSummary
1492 getModuleGraph s = withSession s (return . hsc_mod_graph)
1494 isLoaded :: Session -> Module -> IO Bool
1495 isLoaded s m = withSession s $ \hsc_env ->
1496 return $! isJust (lookupModuleEnv (hsc_HPT hsc_env) m)
1498 getBindings :: Session -> IO [TyThing]
1499 getBindings s = withSession s (return . nameEnvElts . ic_type_env . hsc_IC)
1501 getPrintUnqual :: Session -> IO PrintUnqualified
1502 getPrintUnqual s = withSession s (return . icPrintUnqual . hsc_IC)
1505 -- | Parses a string as an identifier, and returns the list of 'Name's that
1506 -- the identifier can refer to in the current interactive context.
1507 parseName :: Session -> String -> IO [Name]
1508 parseName s str = withSession s $ \hsc_env -> do
1509 maybe_rdr_name <- hscParseIdentifier (hsc_dflags hsc_env) str
1510 case maybe_rdr_name of
1511 Nothing -> return []
1512 Just (L _ rdr_name) -> do
1513 mb_names <- tcRnLookupRdrName hsc_env rdr_name
1515 Nothing -> return []
1516 Just ns -> return ns
1517 -- ToDo: should return error messages
1520 -- | Returns the 'TyThing' for a 'Name'. The 'Name' may refer to any
1521 -- entity known to GHC, including 'Name's defined using 'runStmt'.
1522 lookupName :: Session -> Name -> IO (Maybe TyThing)
1523 lookupName s name = withSession s $ \hsc_env -> do
1524 case lookupTypeEnv (ic_type_env (hsc_IC hsc_env)) name of
1525 Just tt -> return (Just tt)
1527 eps <- readIORef (hsc_EPS hsc_env)
1528 return $! lookupType (hsc_HPT hsc_env) (eps_PTE eps) name
1530 -- | Container for information about a 'Module'.
1531 data ModuleInfo = ModuleInfo {
1532 minf_details :: ModDetails,
1533 minf_rdr_env :: Maybe GlobalRdrEnv
1535 -- ToDo: this should really contain the ModIface too
1536 -- We don't want HomeModInfo here, because a ModuleInfo applies
1537 -- to package modules too.
1539 -- | Request information about a loaded 'Module'
1540 getModuleInfo :: Session -> Module -> IO (Maybe ModuleInfo)
1541 getModuleInfo s mdl = withSession s $ \hsc_env -> do
1542 case lookupModuleEnv (hsc_HPT hsc_env) mdl of
1543 Nothing -> return Nothing
1545 return (Just (ModuleInfo {
1546 minf_details = hm_details hmi,
1547 minf_rdr_env = mi_globals $! hm_iface hmi
1550 -- ToDo: we should be able to call getModuleInfo on a package module,
1551 -- even one that isn't loaded yet.
1553 -- | The list of top-level entities defined in a module
1554 modInfoTyThings :: ModuleInfo -> [TyThing]
1555 modInfoTyThings minf = typeEnvElts (md_types (minf_details minf))
1557 modInfoTopLevelScope :: ModuleInfo -> Maybe [Name]
1558 modInfoTopLevelScope minf
1559 = fmap (map gre_name . globalRdrEnvElts) (minf_rdr_env minf)
1561 modInfoExports :: ModuleInfo -> [Name]
1562 modInfoExports minf = nameSetToList $! (md_exports $! minf_details minf)
1564 modInfoPrintUnqualified :: ModuleInfo -> Maybe PrintUnqualified
1565 modInfoPrintUnqualified minf = fmap unQualInScope (minf_rdr_env minf)
1567 isDictonaryId :: Id -> Bool
1569 = case tcSplitSigmaTy (idType id) of { (tvs, theta, tau) -> isDictTy tau }
1575 | BinaryCode FilePath
1577 type TypecheckedCode = HsTypecheckedGroup
1578 type RenamedCode = [HsGroup Name]
1580 -- ToDo: typechecks abstract syntax or renamed abstract syntax. Issues:
1581 -- - typechecked syntax includes extra dictionary translation and
1582 -- AbsBinds which need to be translated back into something closer to
1583 -- the original source.
1584 -- - renamed syntax currently doesn't exist in a single blob, since
1585 -- renaming and typechecking are interleaved at splice points. We'd
1586 -- need a restriction that there are no splices in the source module.
1589 -- - Data and Typeable instances for HsSyn.
1592 -- - things that aren't in the output of the renamer:
1593 -- - the export list
1597 -- - things that aren't in the output of the typechecker right now:
1598 -- - the export list
1600 -- - type signatures
1601 -- - type/data/newtype declarations
1602 -- - class declarations
1604 -- - extra things in the typechecker's output:
1605 -- - default methods are turned into top-level decls.
1606 -- - dictionary bindings
1608 -- ToDo: check for small transformations that happen to the syntax in
1609 -- the typechecker (eg. -e ==> negate e, perhaps for fromIntegral)
1611 -- ToDo: maybe use TH syntax instead of IfaceSyn? There's already a way
1612 -- to get from TyCons, Ids etc. to TH syntax (reify).
1614 -- :browse will use either lm_toplev or inspect lm_interface, depending
1615 -- on whether the module is interpreted or not.
1617 -- various abstract syntax types (perhaps IfaceBlah)
1621 -- This is for reconstructing refactored source code
1622 -- Calls the lexer repeatedly.
1623 -- ToDo: add comment tokens to token stream
1624 getTokenStream :: Session -> Module -> IO [Located Token]
1627 -- -----------------------------------------------------------------------------
1628 -- Interactive evaluation
1632 -- | Set the interactive evaluation context.
1634 -- Setting the context doesn't throw away any bindings; the bindings
1635 -- we've built up in the InteractiveContext simply move to the new
1636 -- module. They always shadow anything in scope in the current context.
1637 setContext :: Session
1638 -> [Module] -- entire top level scope of these modules
1639 -> [Module] -- exports only of these modules
1641 setContext (Session ref) toplevs exports = do
1642 hsc_env <- readIORef ref
1643 let old_ic = hsc_IC hsc_env
1644 hpt = hsc_HPT hsc_env
1646 mapM_ (checkModuleExists hsc_env hpt) exports
1647 export_env <- mkExportEnv hsc_env exports
1648 toplev_envs <- mapM (mkTopLevEnv hpt) toplevs
1649 let all_env = foldr plusGlobalRdrEnv export_env toplev_envs
1650 writeIORef ref hsc_env{ hsc_IC = old_ic { ic_toplev_scope = toplevs,
1651 ic_exports = exports,
1652 ic_rn_gbl_env = all_env } }
1654 checkModuleExists :: HscEnv -> HomePackageTable -> Module -> IO ()
1655 checkModuleExists hsc_env hpt mod =
1656 case lookupModuleEnv hpt mod of
1657 Just mod_info -> return ()
1658 _not_a_home_module -> do
1659 res <- findPackageModule hsc_env mod True
1661 Found _ _ -> return ()
1662 err -> let msg = cantFindError (hsc_dflags hsc_env) mod err in
1663 throwDyn (CmdLineError (showSDoc msg))
1665 mkTopLevEnv :: HomePackageTable -> Module -> IO GlobalRdrEnv
1666 mkTopLevEnv hpt modl
1667 = case lookupModuleEnv hpt modl of
1669 throwDyn (ProgramError ("mkTopLevEnv: not a home module "
1670 ++ showSDoc (pprModule modl)))
1672 case mi_globals (hm_iface details) of
1674 throwDyn (ProgramError ("mkTopLevEnv: not interpreted "
1675 ++ showSDoc (pprModule modl)))
1676 Just env -> return env
1678 -- | Get the interactive evaluation context, consisting of a pair of the
1679 -- set of modules from which we take the full top-level scope, and the set
1680 -- of modules from which we take just the exports respectively.
1681 getContext :: Session -> IO ([Module],[Module])
1682 getContext s = withSession s (\HscEnv{ hsc_IC=ic } ->
1683 return (ic_toplev_scope ic, ic_exports ic))
1685 -- | Returns 'True' if the specified module is interpreted, and hence has
1686 -- its full top-level scope available.
1687 moduleIsInterpreted :: Session -> Module -> IO Bool
1688 moduleIsInterpreted s modl = withSession s $ \h ->
1689 case lookupModuleEnv (hsc_HPT h) modl of
1690 Just details -> return (isJust (mi_globals (hm_iface details)))
1691 _not_a_home_module -> return False
1693 -- | Looks up an identifier in the current interactive context (for :info)
1694 {-# DEPRECATED getInfo "we should be using parseName/lookupName instead" #-}
1695 getInfo :: Session -> String -> IO [GetInfoResult]
1696 getInfo s id = withSession s $ \hsc_env -> hscGetInfo hsc_env id
1698 -- | Returns all names in scope in the current interactive context
1699 getNamesInScope :: Session -> IO [Name]
1700 getNamesInScope s = withSession s $ \hsc_env -> do
1701 return (map gre_name (globalRdrEnvElts (ic_rn_gbl_env (hsc_IC hsc_env))))
1703 -- -----------------------------------------------------------------------------
1704 -- Getting the type of an expression
1706 -- | Get the type of an expression
1707 exprType :: Session -> String -> IO (Maybe Type)
1708 exprType s expr = withSession s $ \hsc_env -> do
1709 maybe_stuff <- hscTcExpr hsc_env expr
1711 Nothing -> return Nothing
1712 Just ty -> return (Just tidy_ty)
1714 tidy_ty = tidyType emptyTidyEnv ty
1715 dflags = hsc_dflags hsc_env
1717 -- -----------------------------------------------------------------------------
1718 -- Getting the kind of a type
1720 -- | Get the kind of a type
1721 typeKind :: Session -> String -> IO (Maybe Kind)
1722 typeKind s str = withSession s $ \hsc_env -> do
1723 maybe_stuff <- hscKcType hsc_env str
1725 Nothing -> return Nothing
1726 Just kind -> return (Just kind)
1728 -----------------------------------------------------------------------------
1729 -- cmCompileExpr: compile an expression and deliver an HValue
1731 compileExpr :: Session -> String -> IO (Maybe HValue)
1732 compileExpr s expr = withSession s $ \hsc_env -> do
1733 maybe_stuff <- hscStmt hsc_env ("let __cmCompileExpr = "++expr)
1735 Nothing -> return Nothing
1736 Just (new_ic, names, hval) -> do
1738 hvals <- (unsafeCoerce# hval) :: IO [HValue]
1740 case (names,hvals) of
1741 ([n],[hv]) -> return (Just hv)
1742 _ -> panic "compileExpr"
1744 -- -----------------------------------------------------------------------------
1745 -- running a statement interactively
1748 = RunOk [Name] -- ^ names bound by this evaluation
1749 | RunFailed -- ^ statement failed compilation
1750 | RunException Exception -- ^ statement raised an exception
1752 -- | Run a statement in the current interactive context. Statemenet
1753 -- may bind multple values.
1754 runStmt :: Session -> String -> IO RunResult
1755 runStmt (Session ref) expr
1757 hsc_env <- readIORef ref
1759 -- Turn off -fwarn-unused-bindings when running a statement, to hide
1760 -- warnings about the implicit bindings we introduce.
1761 let dflags' = dopt_unset (hsc_dflags hsc_env) Opt_WarnUnusedBinds
1762 hsc_env' = hsc_env{ hsc_dflags = dflags' }
1764 maybe_stuff <- hscStmt hsc_env' expr
1767 Nothing -> return RunFailed
1768 Just (new_hsc_env, names, hval) -> do
1770 let thing_to_run = unsafeCoerce# hval :: IO [HValue]
1771 either_hvals <- sandboxIO thing_to_run
1773 case either_hvals of
1775 -- on error, keep the *old* interactive context,
1776 -- so that 'it' is not bound to something
1777 -- that doesn't exist.
1778 return (RunException e)
1781 -- Get the newly bound things, and bind them.
1782 -- Don't need to delete any shadowed bindings;
1783 -- the new ones override the old ones.
1784 extendLinkEnv (zip names hvals)
1786 writeIORef ref new_hsc_env
1787 return (RunOk names)
1790 -- We run the statement in a "sandbox" to protect the rest of the
1791 -- system from anything the expression might do. For now, this
1792 -- consists of just wrapping it in an exception handler, but see below
1793 -- for another version.
1795 sandboxIO :: IO a -> IO (Either Exception a)
1796 sandboxIO thing = Exception.try thing
1799 -- This version of sandboxIO runs the expression in a completely new
1800 -- RTS main thread. It is disabled for now because ^C exceptions
1801 -- won't be delivered to the new thread, instead they'll be delivered
1802 -- to the (blocked) GHCi main thread.
1804 -- SLPJ: when re-enabling this, reflect a wrong-stat error as an exception
1806 sandboxIO :: IO a -> IO (Either Int (Either Exception a))
1807 sandboxIO thing = do
1808 st_thing <- newStablePtr (Exception.try thing)
1809 alloca $ \ p_st_result -> do
1810 stat <- rts_evalStableIO st_thing p_st_result
1811 freeStablePtr st_thing
1813 then do st_result <- peek p_st_result
1814 result <- deRefStablePtr st_result
1815 freeStablePtr st_result
1816 return (Right result)
1818 return (Left (fromIntegral stat))
1820 foreign import "rts_evalStableIO" {- safe -}
1821 rts_evalStableIO :: StablePtr (IO a) -> Ptr (StablePtr a) -> IO CInt
1822 -- more informative than the C type!
1825 -- ---------------------------------------------------------------------------
1826 -- cmBrowseModule: get all the TyThings defined in a module
1828 {-# DEPRECATED browseModule "we should be using getModuleInfo instead" #-}
1829 browseModule :: Session -> Module -> Bool -> IO [IfaceDecl]
1830 browseModule s modl exports_only = withSession s $ \hsc_env -> do
1831 mb_decls <- getModuleContents hsc_env modl exports_only
1833 Nothing -> return [] -- An error of some kind
1834 Just ds -> return ds
1837 -----------------------------------------------------------------------------
1838 -- show a module and it's source/object filenames
1840 showModule :: Session -> ModSummary -> IO String
1841 showModule s mod_summary = withSession s $ \hsc_env -> do
1842 case lookupModuleEnv (hsc_HPT hsc_env) (ms_mod mod_summary) of
1843 Nothing -> panic "missing linkable"
1844 Just mod_info -> return (showModMsg obj_linkable mod_summary)
1846 obj_linkable = isObjectLinkable (fromJust (hm_linkable mod_info))