1 -- -----------------------------------------------------------------------------
3 -- (c) The University of Glasgow, 2005
7 -- -----------------------------------------------------------------------------
13 defaultCleanupHandler,
17 -- * Flags and settings
18 DynFlags(..), DynFlag(..), GhcMode(..), HscTarget(..), dopt,
26 Target(..), TargetId(..), Phase,
33 -- * Loading\/compiling the program
35 load, LoadHowMuch(..), SuccessFlag(..), -- also does depanal
37 workingDirectoryChanged,
38 checkModule, CheckedModule(..),
39 TypecheckedSource, ParsedSource, RenamedSource,
41 -- * Inspecting the module structure of the program
42 ModuleGraph, ModSummary(..),
47 -- * Inspecting modules
52 modInfoPrintUnqualified,
55 modInfoIsExportedName,
59 -- * Interactive evaluation
60 getBindings, getPrintUnqual,
62 setContext, getContext,
65 getInfo, GetInfoResult,
77 -- * Abstract syntax elements
80 Module, mkModule, pprModule,
87 isImplicitId, isDeadBinder,
88 isSpecPragmaId, isExportedId, isLocalId, isGlobalId,
90 isPrimOpId, isFCallId,
91 isDataConWorkId, idDataCon,
92 isBottomingId, isDictonaryId,
94 -- ** Type constructors
96 isClassTyCon, isSynTyCon, isNewTyCon,
98 -- ** Data constructors
103 classSCTheta, classTvsFds,
108 -- ** Types and Kinds
116 module HsSyn, -- ToDo: remove extraneous bits
119 GhcException(..), showGhcException,
129 * inline bits of HscMain here to simplify layering: hscGetInfo,
131 * we need to expose DynFlags, so should parseDynamicFlags really be
132 part of this interface?
133 * what StaticFlags should we expose, if any?
136 #include "HsVersions.h"
139 import qualified Linker
140 import Linker ( HValue, extendLinkEnv )
141 import NameEnv ( lookupNameEnv )
142 import TcRnDriver ( getModuleContents, tcRnLookupRdrName,
144 import RdrName ( plusGlobalRdrEnv, Provenance(..), ImportSpec(..),
145 emptyGlobalRdrEnv, mkGlobalRdrEnv )
146 import HscMain ( hscGetInfo, GetInfoResult, hscParseIdentifier,
147 hscStmt, hscTcExpr, hscKcType )
148 import Type ( tidyType )
149 import VarEnv ( emptyTidyEnv )
150 import GHC.Exts ( unsafeCoerce# )
151 import IfaceSyn ( IfaceDecl )
152 import Name ( getName, nameModule_maybe )
153 import SrcLoc ( mkSrcLoc, srcLocSpan, interactiveSrcLoc )
154 import Bag ( unitBag, emptyBag )
157 import Packages ( initPackages )
158 import NameSet ( NameSet, nameSetToList, elemNameSet )
159 import RdrName ( GlobalRdrEnv, GlobalRdrElt(..), RdrName, gre_name,
162 import Type ( Kind, Type, dropForAlls )
163 import Id ( Id, idType, isImplicitId, isDeadBinder,
164 isSpecPragmaId, isExportedId, isLocalId, isGlobalId,
166 isPrimOpId, isFCallId,
167 isDataConWorkId, idDataCon,
169 import TyCon ( TyCon, isClassTyCon, isSynTyCon, isNewTyCon )
170 import Class ( Class, classSCTheta, classTvsFds )
171 import DataCon ( DataCon )
172 import Name ( Name, nameModule )
173 import NameEnv ( nameEnvElts )
174 import InstEnv ( Instance )
175 import SrcLoc ( Located(..) )
176 import DriverPipeline
177 import DriverPhases ( Phase(..), isHaskellSrcFilename, startPhase )
178 import GetImports ( getImports )
179 import Packages ( isHomePackage )
181 import HscMain ( newHscEnv, hscFileCheck, HscResult(..) )
185 import SysTools ( initSysTools, cleanTempFiles )
190 import ErrUtils ( showPass, Messages, putMsg, debugTraceMsg )
191 import qualified ErrUtils
193 import StringBuffer ( StringBuffer, hGetStringBuffer )
195 import SysTools ( cleanTempFilesExcept )
196 import BasicTypes ( SuccessFlag(..), succeeded, failed )
197 import Maybes ( orElse, expectJust, mapCatMaybes )
198 import TcType ( tcSplitSigmaTy, isDictTy )
199 import FastString ( mkFastString )
201 import Directory ( getModificationTime, doesFileExist )
202 import Maybe ( isJust, isNothing, fromJust, fromMaybe, catMaybes )
203 import Maybes ( expectJust )
204 import List ( partition, nub )
205 import qualified List
206 import Monad ( unless, when, foldM )
207 import System ( exitWith, ExitCode(..) )
208 import Time ( ClockTime )
209 import EXCEPTION as Exception hiding (handle)
212 import Prelude hiding (init)
214 -- -----------------------------------------------------------------------------
215 -- Exception handlers
217 -- | Install some default exception handlers and run the inner computation.
218 -- Unless you want to handle exceptions yourself, you should wrap this around
219 -- the top level of your program. The default handlers output the error
220 -- message(s) to stderr and exit cleanly.
221 defaultErrorHandler :: IO a -> IO a
222 defaultErrorHandler inner =
223 -- top-level exception handler: any unrecognised exception is a compiler bug.
224 handle (\exception -> do
227 -- an IO exception probably isn't our fault, so don't panic
228 IOException _ -> putMsg (show exception)
229 AsyncException StackOverflow ->
230 putMsg "stack overflow: use +RTS -K<size> to increase it"
231 _other -> putMsg (show (Panic (show exception)))
232 exitWith (ExitFailure 1)
235 -- all error messages are propagated as exceptions
236 handleDyn (\dyn -> do
239 PhaseFailed _ code -> exitWith code
240 Interrupted -> exitWith (ExitFailure 1)
241 _ -> do putMsg (show (dyn :: GhcException))
242 exitWith (ExitFailure 1)
246 -- | Install a default cleanup handler to remove temporary files
247 -- deposited by a GHC run. This is seperate from
248 -- 'defaultErrorHandler', because you might want to override the error
249 -- handling, but still get the ordinary cleanup behaviour.
250 defaultCleanupHandler :: DynFlags -> IO a -> IO a
251 defaultCleanupHandler dflags inner =
252 -- make sure we clean up after ourselves
253 later (unless (dopt Opt_KeepTmpFiles dflags) $
254 cleanTempFiles dflags)
255 -- exceptions will be blocked while we clean the temporary files,
256 -- so there shouldn't be any difficulty if we receive further
261 -- | Initialises GHC. This must be done /once/ only. Takes the
262 -- command-line arguments. All command-line arguments which aren't
263 -- understood by GHC will be returned.
265 init :: [String] -> IO [String]
268 installSignalHandlers
270 -- Grab the -B option if there is one
271 let (minusB_args, argv1) = partition (prefixMatch "-B") args
272 dflags0 <- initSysTools minusB_args defaultDynFlags
273 writeIORef v_initDynFlags dflags0
275 -- Parse the static flags
276 argv2 <- parseStaticFlags argv1
279 GLOBAL_VAR(v_initDynFlags, error "initDynFlags", DynFlags)
280 -- stores the DynFlags between the call to init and subsequent
281 -- calls to newSession.
283 -- | Starts a new session. A session consists of a set of loaded
284 -- modules, a set of options (DynFlags), and an interactive context.
285 -- ToDo: GhcMode should say "keep typechecked code" and\/or "keep renamed
287 newSession :: GhcMode -> IO Session
289 dflags0 <- readIORef v_initDynFlags
290 dflags <- initDynFlags dflags0
291 env <- newHscEnv dflags{ ghcMode=mode }
295 -- tmp: this breaks the abstraction, but required because DriverMkDepend
296 -- needs to call the Finder. ToDo: untangle this.
297 sessionHscEnv :: Session -> IO HscEnv
298 sessionHscEnv (Session ref) = readIORef ref
300 withSession :: Session -> (HscEnv -> IO a) -> IO a
301 withSession (Session ref) f = do h <- readIORef ref; f h
303 modifySession :: Session -> (HscEnv -> HscEnv) -> IO ()
304 modifySession (Session ref) f = do h <- readIORef ref; writeIORef ref $! f h
306 -- -----------------------------------------------------------------------------
309 -- | Grabs the DynFlags from the Session
310 getSessionDynFlags :: Session -> IO DynFlags
311 getSessionDynFlags s = withSession s (return . hsc_dflags)
313 -- | Updates the DynFlags in a Session
314 setSessionDynFlags :: Session -> DynFlags -> IO ()
315 setSessionDynFlags s dflags = modifySession s (\h -> h{ hsc_dflags = dflags })
317 -- | Messages during compilation (eg. warnings and progress messages)
318 -- are reported using this callback. By default, these messages are
319 -- printed to stderr.
320 setMsgHandler :: (String -> IO ()) -> IO ()
321 setMsgHandler = ErrUtils.setMsgHandler
323 -- -----------------------------------------------------------------------------
326 -- ToDo: think about relative vs. absolute file paths. And what
327 -- happens when the current directory changes.
329 -- | Sets the targets for this session. Each target may be a module name
330 -- or a filename. The targets correspond to the set of root modules for
331 -- the program\/library. Unloading the current program is achieved by
332 -- setting the current set of targets to be empty, followed by load.
333 setTargets :: Session -> [Target] -> IO ()
334 setTargets s targets = modifySession s (\h -> h{ hsc_targets = targets })
336 -- | returns the current set of targets
337 getTargets :: Session -> IO [Target]
338 getTargets s = withSession s (return . hsc_targets)
340 -- | Add another target
341 addTarget :: Session -> Target -> IO ()
343 = modifySession s (\h -> h{ hsc_targets = target : hsc_targets h })
346 removeTarget :: Session -> TargetId -> IO ()
347 removeTarget s target_id
348 = modifySession s (\h -> h{ hsc_targets = filter (hsc_targets h) })
350 filter targets = [ t | t@(Target id _) <- targets, id /= target_id ]
352 -- Attempts to guess what Target a string refers to. This function implements
353 -- the --make/GHCi command-line syntax for filenames:
355 -- - if the string looks like a Haskell source filename, then interpret
357 -- - if adding a .hs or .lhs suffix yields the name of an existing file,
359 -- - otherwise interpret the string as a module name
361 guessTarget :: String -> Maybe Phase -> IO Target
362 guessTarget file (Just phase)
363 = return (Target (TargetFile file (Just phase)) Nothing)
364 guessTarget file Nothing
365 | isHaskellSrcFilename file
366 = return (Target (TargetFile file Nothing) Nothing)
368 = do exists <- doesFileExist hs_file
370 then return (Target (TargetFile hs_file Nothing) Nothing)
372 exists <- doesFileExist lhs_file
374 then return (Target (TargetFile lhs_file Nothing) Nothing)
376 return (Target (TargetModule (mkModule file)) Nothing)
378 hs_file = file `joinFileExt` "hs"
379 lhs_file = file `joinFileExt` "lhs"
381 -- -----------------------------------------------------------------------------
382 -- Loading the program
384 -- Perform a dependency analysis starting from the current targets
385 -- and update the session with the new module graph.
386 depanal :: Session -> [Module] -> IO ()
387 depanal (Session ref) excluded_mods = do
388 hsc_env <- readIORef ref
390 dflags = hsc_dflags hsc_env
391 gmode = ghcMode (hsc_dflags hsc_env)
392 targets = hsc_targets hsc_env
393 old_graph = hsc_mod_graph hsc_env
395 showPass dflags "Chasing dependencies"
396 when (gmode == BatchCompile) $
397 debugTraceMsg dflags 1 (showSDoc (hcat [
398 text "Chasing modules from: ",
399 hcat (punctuate comma (map pprTarget targets))]))
401 graph <- downsweep hsc_env old_graph excluded_mods
402 writeIORef ref hsc_env{ hsc_mod_graph=graph }
405 -- | The result of load.
407 = LoadOk Errors -- ^ all specified targets were loaded successfully.
408 | LoadFailed Errors -- ^ not all modules were loaded.
410 type Errors = [String]
412 data ErrMsg = ErrMsg {
413 errMsgSeverity :: Severity, -- warning, error, etc.
414 errMsgSpans :: [SrcSpan],
415 errMsgShortDoc :: Doc,
416 errMsgExtraInfo :: Doc
423 | LoadDependenciesOf Module
425 -- | Try to load the program. If a Module is supplied, then just
426 -- attempt to load up to this target. If no Module is supplied,
427 -- then try to load all targets.
428 load :: Session -> LoadHowMuch -> IO SuccessFlag
429 load session how_much =
430 loadMsgs session how_much ErrUtils.printErrorsAndWarnings
432 -- | Version of 'load' that takes a callback function to be invoked
433 -- on compiler errors and warnings as they occur during compilation.
434 loadMsgs :: Session -> LoadHowMuch -> (Messages-> IO ()) -> IO SuccessFlag
435 loadMsgs s@(Session ref) how_much msg_act
437 -- Dependency analysis first. Note that this fixes the module graph:
438 -- even if we don't get a fully successful upsweep, the full module
439 -- graph is still retained in the Session. We can tell which modules
440 -- were successfully loaded by inspecting the Session's HPT.
443 hsc_env <- readIORef ref
445 let hpt1 = hsc_HPT hsc_env
446 let dflags = hsc_dflags hsc_env
447 let mod_graph = hsc_mod_graph hsc_env
449 let ghci_mode = ghcMode (hsc_dflags hsc_env) -- this never changes
450 let verb = verbosity dflags
452 -- The "bad" boot modules are the ones for which we have
453 -- B.hs-boot in the module graph, but no B.hs
454 -- The downsweep should have ensured this does not happen
456 let all_home_mods = [ms_mod s | s <- mod_graph, not (isBootSummary s)]
457 bad_boot_mods = [s | s <- mod_graph, isBootSummary s,
458 not (ms_mod s `elem` all_home_mods)]
459 ASSERT( null bad_boot_mods ) return ()
461 -- mg2_with_srcimps drops the hi-boot nodes, returning a
462 -- graph with cycles. Among other things, it is used for
463 -- backing out partially complete cycles following a failed
464 -- upsweep, and for removing from hpt all the modules
465 -- not in strict downwards closure, during calls to compile.
466 let mg2_with_srcimps :: [SCC ModSummary]
467 mg2_with_srcimps = topSortModuleGraph True mod_graph Nothing
469 -- check the stability property for each module.
470 stable_mods@(stable_obj,stable_bco)
471 | BatchCompile <- ghci_mode = ([],[])
472 | otherwise = checkStability hpt1 mg2_with_srcimps all_home_mods
474 -- prune bits of the HPT which are definitely redundant now,
476 pruned_hpt = pruneHomePackageTable hpt1
477 (flattenSCCs mg2_with_srcimps)
482 debugTraceMsg dflags 2 (showSDoc (text "Stable obj:" <+> ppr stable_obj $$
483 text "Stable BCO:" <+> ppr stable_bco))
485 -- Unload any modules which are going to be re-linked this time around.
486 let stable_linkables = [ linkable
487 | m <- stable_obj++stable_bco,
488 Just hmi <- [lookupModuleEnv pruned_hpt m],
489 Just linkable <- [hm_linkable hmi] ]
490 unload hsc_env stable_linkables
492 -- We could at this point detect cycles which aren't broken by
493 -- a source-import, and complain immediately, but it seems better
494 -- to let upsweep_mods do this, so at least some useful work gets
495 -- done before the upsweep is abandoned.
496 --hPutStrLn stderr "after tsort:\n"
497 --hPutStrLn stderr (showSDoc (vcat (map ppr mg2)))
499 -- Now do the upsweep, calling compile for each module in
500 -- turn. Final result is version 3 of everything.
502 -- Topologically sort the module graph, this time including hi-boot
503 -- nodes, and possibly just including the portion of the graph
504 -- reachable from the module specified in the 2nd argument to load.
505 -- This graph should be cycle-free.
506 -- If we're restricting the upsweep to a portion of the graph, we
507 -- also want to retain everything that is still stable.
508 let full_mg :: [SCC ModSummary]
509 full_mg = topSortModuleGraph False mod_graph Nothing
511 maybe_top_mod = case how_much of
513 LoadDependenciesOf m -> Just m
516 partial_mg0 :: [SCC ModSummary]
517 partial_mg0 = topSortModuleGraph False mod_graph maybe_top_mod
519 -- LoadDependenciesOf m: we want the upsweep to stop just
520 -- short of the specified module (unless the specified module
523 | LoadDependenciesOf mod <- how_much
524 = ASSERT( case last partial_mg0 of
525 AcyclicSCC ms -> ms_mod ms == mod; _ -> False )
526 List.init partial_mg0
532 | AcyclicSCC ms <- full_mg,
533 ms_mod ms `elem` stable_obj++stable_bco,
534 ms_mod ms `notElem` [ ms_mod ms' |
535 AcyclicSCC ms' <- partial_mg ] ]
537 mg = stable_mg ++ partial_mg
539 -- clean up between compilations
540 let cleanup = cleanTempFilesExcept dflags
541 (ppFilesFromSummaries (flattenSCCs mg2_with_srcimps))
543 (upsweep_ok, hsc_env1, modsUpswept)
544 <- upsweep (hsc_env { hsc_HPT = emptyHomePackageTable })
545 pruned_hpt stable_mods cleanup msg_act mg
547 -- Make modsDone be the summaries for each home module now
548 -- available; this should equal the domain of hpt3.
549 -- Get in in a roughly top .. bottom order (hence reverse).
551 let modsDone = reverse modsUpswept
553 -- Try and do linking in some form, depending on whether the
554 -- upsweep was completely or only partially successful.
556 if succeeded upsweep_ok
559 -- Easy; just relink it all.
560 do debugTraceMsg dflags 2 "Upsweep completely successful."
562 -- Clean up after ourselves
563 cleanTempFilesExcept dflags (ppFilesFromSummaries modsDone)
565 -- Issue a warning for the confusing case where the user
566 -- said '-o foo' but we're not going to do any linking.
567 -- We attempt linking if either (a) one of the modules is
568 -- called Main, or (b) the user said -no-hs-main, indicating
569 -- that main() is going to come from somewhere else.
571 let ofile = outputFile dflags
572 let no_hs_main = dopt Opt_NoHsMain dflags
573 let mb_main_mod = mainModIs dflags
575 main_mod = mb_main_mod `orElse` "Main"
577 = any ((==main_mod).moduleUserString.ms_mod)
579 do_linking = a_root_is_Main || no_hs_main
581 when (ghci_mode == BatchCompile && isJust ofile && not do_linking) $
582 debugTraceMsg dflags 1 ("Warning: output was redirected with -o, " ++
583 "but no output will be generated\n" ++
584 "because there is no " ++ main_mod ++ " module.")
586 -- link everything together
587 linkresult <- link ghci_mode dflags do_linking (hsc_HPT hsc_env1)
589 loadFinish Succeeded linkresult ref hsc_env1
592 -- Tricky. We need to back out the effects of compiling any
593 -- half-done cycles, both so as to clean up the top level envs
594 -- and to avoid telling the interactive linker to link them.
595 do debugTraceMsg dflags 2 "Upsweep partially successful."
598 = map ms_mod modsDone
599 let mods_to_zap_names
600 = findPartiallyCompletedCycles modsDone_names
603 = filter ((`notElem` mods_to_zap_names).ms_mod)
606 let hpt4 = retainInTopLevelEnvs (map ms_mod mods_to_keep)
609 -- Clean up after ourselves
610 cleanTempFilesExcept dflags (ppFilesFromSummaries mods_to_keep)
612 -- there should be no Nothings where linkables should be, now
613 ASSERT(all (isJust.hm_linkable)
614 (moduleEnvElts (hsc_HPT hsc_env))) do
616 -- Link everything together
617 linkresult <- link ghci_mode dflags False hpt4
619 let hsc_env4 = hsc_env1{ hsc_HPT = hpt4 }
620 loadFinish Failed linkresult ref hsc_env4
622 -- Finish up after a load.
624 -- If the link failed, unload everything and return.
625 loadFinish all_ok Failed ref hsc_env
626 = do unload hsc_env []
627 writeIORef ref $! discardProg hsc_env
630 -- Empty the interactive context and set the module context to the topmost
631 -- newly loaded module, or the Prelude if none were loaded.
632 loadFinish all_ok Succeeded ref hsc_env
633 = do writeIORef ref $! hsc_env{ hsc_IC = emptyInteractiveContext }
637 -- Forget the current program, but retain the persistent info in HscEnv
638 discardProg :: HscEnv -> HscEnv
640 = hsc_env { hsc_mod_graph = emptyMG,
641 hsc_IC = emptyInteractiveContext,
642 hsc_HPT = emptyHomePackageTable }
644 -- used to fish out the preprocess output files for the purposes of
645 -- cleaning up. The preprocessed file *might* be the same as the
646 -- source file, but that doesn't do any harm.
647 ppFilesFromSummaries summaries = [ fn | Just fn <- map ms_hspp_file summaries ]
649 -- -----------------------------------------------------------------------------
653 CheckedModule { parsedSource :: ParsedSource,
654 renamedSource :: Maybe RenamedSource,
655 typecheckedSource :: Maybe TypecheckedSource,
656 checkedModuleInfo :: Maybe ModuleInfo
658 -- ToDo: improvements that could be made here:
659 -- if the module succeeded renaming but not typechecking,
660 -- we can still get back the GlobalRdrEnv and exports, so
661 -- perhaps the ModuleInfo should be split up into separate
662 -- fields within CheckedModule.
664 type ParsedSource = Located (HsModule RdrName)
665 type RenamedSource = HsGroup Name
666 type TypecheckedSource = LHsBinds Id
668 -- | This is the way to get access to parsed and typechecked source code
669 -- for a module. 'checkModule' loads all the dependencies of the specified
670 -- module in the Session, and then attempts to typecheck the module. If
671 -- successful, it returns the abstract syntax for the module.
672 checkModule :: Session -> Module -> (Messages -> IO ())
673 -> IO (Maybe CheckedModule)
674 checkModule session@(Session ref) mod msg_act = do
675 -- load up the dependencies first
676 r <- loadMsgs session (LoadDependenciesOf mod) msg_act
677 if (failed r) then return Nothing else do
679 -- now parse & typecheck the module
680 hsc_env <- readIORef ref
681 let mg = hsc_mod_graph hsc_env
682 case [ ms | ms <- mg, ms_mod ms == mod ] of
685 -- Add in the OPTIONS from the source file This is nasty:
686 -- we've done this once already, in the compilation manager
687 -- It might be better to cache the flags in the
688 -- ml_hspp_file field, say
689 let dflags0 = hsc_dflags hsc_env
690 hspp_buf = expectJust "GHC.checkModule" (ms_hspp_buf ms)
691 opts = getOptionsFromStringBuffer hspp_buf
692 (dflags1,leftovers) <- parseDynamicFlags dflags0 (map snd opts)
693 if (not (null leftovers))
694 then do let filename = fromJust (ml_hs_file (ms_location ms))
695 msg_act (optionsErrorMsgs leftovers opts filename)
699 r <- hscFileCheck hsc_env{hsc_dflags=dflags1} msg_act ms
703 HscChecked parsed renamed Nothing ->
704 return (Just (CheckedModule {
705 parsedSource = parsed,
706 renamedSource = renamed,
707 typecheckedSource = Nothing,
708 checkedModuleInfo = Nothing }))
709 HscChecked parsed renamed
710 (Just (tc_binds, rdr_env, details)) -> do
711 let minf = ModuleInfo {
712 minf_type_env = md_types details,
713 minf_exports = md_exports details,
714 minf_rdr_env = Just rdr_env,
715 minf_instances = md_insts details
717 return (Just (CheckedModule {
718 parsedSource = parsed,
719 renamedSource = renamed,
720 typecheckedSource = Just tc_binds,
721 checkedModuleInfo = Just minf }))
723 -- ---------------------------------------------------------------------------
726 unload :: HscEnv -> [Linkable] -> IO ()
727 unload hsc_env stable_linkables -- Unload everthing *except* 'stable_linkables'
728 = case ghcMode (hsc_dflags hsc_env) of
729 BatchCompile -> return ()
730 JustTypecheck -> return ()
732 Interactive -> Linker.unload (hsc_dflags hsc_env) stable_linkables
734 Interactive -> panic "unload: no interpreter"
736 other -> panic "unload: strange mode"
738 -- -----------------------------------------------------------------------------
742 Stability tells us which modules definitely do not need to be recompiled.
743 There are two main reasons for having stability:
745 - avoid doing a complete upsweep of the module graph in GHCi when
746 modules near the bottom of the tree have not changed.
748 - to tell GHCi when it can load object code: we can only load object code
749 for a module when we also load object code fo all of the imports of the
750 module. So we need to know that we will definitely not be recompiling
751 any of these modules, and we can use the object code.
753 NB. stability is of no importance to BatchCompile at all, only Interactive.
754 (ToDo: what about JustTypecheck?)
756 The stability check is as follows. Both stableObject and
757 stableBCO are used during the upsweep phase later.
760 stable m = stableObject m || stableBCO m
763 all stableObject (imports m)
764 && old linkable does not exist, or is == on-disk .o
765 && date(on-disk .o) > date(.hs)
768 all stable (imports m)
769 && date(BCO) > date(.hs)
772 These properties embody the following ideas:
774 - if a module is stable:
775 - if it has been compiled in a previous pass (present in HPT)
776 then it does not need to be compiled or re-linked.
777 - if it has not been compiled in a previous pass,
778 then we only need to read its .hi file from disk and
779 link it to produce a ModDetails.
781 - if a modules is not stable, we will definitely be at least
782 re-linking, and possibly re-compiling it during the upsweep.
783 All non-stable modules can (and should) therefore be unlinked
786 - Note that objects are only considered stable if they only depend
787 on other objects. We can't link object code against byte code.
791 :: HomePackageTable -- HPT from last compilation
792 -> [SCC ModSummary] -- current module graph (cyclic)
793 -> [Module] -- all home modules
794 -> ([Module], -- stableObject
795 [Module]) -- stableBCO
797 checkStability hpt sccs all_home_mods = foldl checkSCC ([],[]) sccs
799 checkSCC (stable_obj, stable_bco) scc0
800 | stableObjects = (scc_mods ++ stable_obj, stable_bco)
801 | stableBCOs = (stable_obj, scc_mods ++ stable_bco)
802 | otherwise = (stable_obj, stable_bco)
804 scc = flattenSCC scc0
805 scc_mods = map ms_mod scc
806 home_module m = m `elem` all_home_mods && m `notElem` scc_mods
808 scc_allimps = nub (filter home_module (concatMap ms_allimps scc))
809 -- all imports outside the current SCC, but in the home pkg
811 stable_obj_imps = map (`elem` stable_obj) scc_allimps
812 stable_bco_imps = map (`elem` stable_bco) scc_allimps
819 and (zipWith (||) stable_obj_imps stable_bco_imps)
823 | Just t <- ms_obj_date ms = t >= ms_hs_date ms
827 same_as_prev t = case lookupModuleEnv hpt (ms_mod ms) of
829 Just hmi | Just l <- hm_linkable hmi
830 -> isObjectLinkable l && t == linkableTime l
831 -- why '>=' rather than '>' above? If the filesystem stores
832 -- times to the nearset second, we may occasionally find that
833 -- the object & source have the same modification time,
834 -- especially if the source was automatically generated
835 -- and compiled. Using >= is slightly unsafe, but it matches
839 = case lookupModuleEnv hpt (ms_mod ms) of
841 Just hmi | Just l <- hm_linkable hmi ->
842 not (isObjectLinkable l) &&
843 linkableTime l >= ms_hs_date ms
845 ms_allimps :: ModSummary -> [Module]
846 ms_allimps ms = ms_srcimps ms ++ ms_imps ms
848 -- -----------------------------------------------------------------------------
849 -- Prune the HomePackageTable
851 -- Before doing an upsweep, we can throw away:
853 -- - For non-stable modules:
854 -- - all ModDetails, all linked code
855 -- - all unlinked code that is out of date with respect to
858 -- This is VERY IMPORTANT otherwise we'll end up requiring 2x the
859 -- space at the end of the upsweep, because the topmost ModDetails of the
860 -- old HPT holds on to the entire type environment from the previous
863 pruneHomePackageTable
866 -> ([Module],[Module])
869 pruneHomePackageTable hpt summ (stable_obj, stable_bco)
870 = mapModuleEnv prune hpt
872 | is_stable modl = hmi'
873 | otherwise = hmi'{ hm_details = emptyModDetails }
875 modl = mi_module (hm_iface hmi)
876 hmi' | Just l <- hm_linkable hmi, linkableTime l < ms_hs_date ms
877 = hmi{ hm_linkable = Nothing }
880 where ms = expectJust "prune" (lookupModuleEnv ms_map modl)
882 ms_map = mkModuleEnv [(ms_mod ms, ms) | ms <- summ]
884 is_stable m = m `elem` stable_obj || m `elem` stable_bco
886 -- -----------------------------------------------------------------------------
888 -- Return (names of) all those in modsDone who are part of a cycle
889 -- as defined by theGraph.
890 findPartiallyCompletedCycles :: [Module] -> [SCC ModSummary] -> [Module]
891 findPartiallyCompletedCycles modsDone theGraph
895 chew ((AcyclicSCC v):rest) = chew rest -- acyclic? not interesting.
896 chew ((CyclicSCC vs):rest)
897 = let names_in_this_cycle = nub (map ms_mod vs)
899 = nub ([done | done <- modsDone,
900 done `elem` names_in_this_cycle])
901 chewed_rest = chew rest
903 if notNull mods_in_this_cycle
904 && length mods_in_this_cycle < length names_in_this_cycle
905 then mods_in_this_cycle ++ chewed_rest
908 -- -----------------------------------------------------------------------------
911 -- This is where we compile each module in the module graph, in a pass
912 -- from the bottom to the top of the graph.
914 -- There better had not be any cyclic groups here -- we check for them.
917 :: HscEnv -- Includes initially-empty HPT
918 -> HomePackageTable -- HPT from last time round (pruned)
919 -> ([Module],[Module]) -- stable modules (see checkStability)
920 -> IO () -- How to clean up unwanted tmp files
921 -> (Messages -> IO ()) -- Compiler error message callback
922 -> [SCC ModSummary] -- Mods to do (the worklist)
924 HscEnv, -- With an updated HPT
925 [ModSummary]) -- Mods which succeeded
927 upsweep hsc_env old_hpt stable_mods cleanup msg_act mods
928 = upsweep' hsc_env old_hpt stable_mods cleanup msg_act mods 1 (length mods)
930 upsweep' hsc_env old_hpt stable_mods cleanup msg_act
932 = return (Succeeded, hsc_env, [])
934 upsweep' hsc_env old_hpt stable_mods cleanup msg_act
936 = do putMsg (showSDoc (cyclicModuleErr ms))
937 return (Failed, hsc_env, [])
939 upsweep' hsc_env old_hpt stable_mods cleanup msg_act
940 (AcyclicSCC mod:mods) mod_index nmods
941 = do -- putStrLn ("UPSWEEP_MOD: hpt = " ++
942 -- show (map (moduleUserString.moduleName.mi_module.hm_iface)
943 -- (moduleEnvElts (hsc_HPT hsc_env)))
945 mb_mod_info <- upsweep_mod hsc_env old_hpt stable_mods msg_act mod
948 cleanup -- Remove unwanted tmp files between compilations
951 Nothing -> return (Failed, hsc_env, [])
953 { let this_mod = ms_mod mod
955 -- Add new info to hsc_env
956 hpt1 = extendModuleEnv (hsc_HPT hsc_env)
958 hsc_env1 = hsc_env { hsc_HPT = hpt1 }
960 -- Space-saving: delete the old HPT entry
961 -- for mod BUT if mod is a hs-boot
962 -- node, don't delete it. For the
963 -- interface, the HPT entry is probaby for the
964 -- main Haskell source file. Deleting it
965 -- would force .. (what?? --SDM)
966 old_hpt1 | isBootSummary mod = old_hpt
967 | otherwise = delModuleEnv old_hpt this_mod
969 ; (restOK, hsc_env2, modOKs)
970 <- upsweep' hsc_env1 old_hpt1 stable_mods cleanup
971 msg_act mods (mod_index+1) nmods
972 ; return (restOK, hsc_env2, mod:modOKs)
976 -- Compile a single module. Always produce a Linkable for it if
977 -- successful. If no compilation happened, return the old Linkable.
978 upsweep_mod :: HscEnv
980 -> ([Module],[Module])
981 -> (Messages -> IO ())
983 -> Int -- index of module
984 -> Int -- total number of modules
985 -> IO (Maybe HomeModInfo) -- Nothing => Failed
987 upsweep_mod hsc_env old_hpt (stable_obj, stable_bco) msg_act summary mod_index nmods
990 this_mod = ms_mod summary
991 mb_obj_date = ms_obj_date summary
992 obj_fn = ml_obj_file (ms_location summary)
993 hs_date = ms_hs_date summary
995 compile_it :: Maybe Linkable -> IO (Maybe HomeModInfo)
996 compile_it = upsweep_compile hsc_env old_hpt this_mod
997 msg_act summary mod_index nmods
999 case ghcMode (hsc_dflags hsc_env) of
1002 -- Batch-compilating is easy: just check whether we have
1003 -- an up-to-date object file. If we do, then the compiler
1004 -- needs to do a recompilation check.
1005 _ | Just obj_date <- mb_obj_date, obj_date >= hs_date -> do
1007 findObjectLinkable this_mod obj_fn obj_date
1008 compile_it (Just linkable)
1015 _ | is_stable_obj, isJust old_hmi ->
1017 -- object is stable, and we have an entry in the
1018 -- old HPT: nothing to do
1020 | is_stable_obj, isNothing old_hmi -> do
1022 findObjectLinkable this_mod obj_fn
1023 (expectJust "upseep1" mb_obj_date)
1024 compile_it (Just linkable)
1025 -- object is stable, but we need to load the interface
1026 -- off disk to make a HMI.
1029 ASSERT(isJust old_hmi) -- must be in the old_hpt
1031 -- BCO is stable: nothing to do
1033 | Just hmi <- old_hmi,
1034 Just l <- hm_linkable hmi, not (isObjectLinkable l),
1035 linkableTime l >= ms_hs_date summary ->
1037 -- we have an old BCO that is up to date with respect
1038 -- to the source: do a recompilation check as normal.
1042 -- no existing code at all: we must recompile.
1044 is_stable_obj = this_mod `elem` stable_obj
1045 is_stable_bco = this_mod `elem` stable_bco
1047 old_hmi = lookupModuleEnv old_hpt this_mod
1049 -- Run hsc to compile a module
1050 upsweep_compile hsc_env old_hpt this_mod msg_act summary
1052 mb_old_linkable = do
1054 -- The old interface is ok if it's in the old HPT
1055 -- a) we're compiling a source file, and the old HPT
1056 -- entry is for a source file
1057 -- b) we're compiling a hs-boot file
1058 -- Case (b) allows an hs-boot file to get the interface of its
1059 -- real source file on the second iteration of the compilation
1060 -- manager, but that does no harm. Otherwise the hs-boot file
1061 -- will always be recompiled
1064 = case lookupModuleEnv old_hpt this_mod of
1066 Just hm_info | isBootSummary summary -> Just iface
1067 | not (mi_boot iface) -> Just iface
1068 | otherwise -> Nothing
1070 iface = hm_iface hm_info
1072 compresult <- compile hsc_env msg_act summary mb_old_linkable mb_old_iface
1076 -- Compilation failed. Compile may still have updated the PCS, tho.
1077 CompErrs -> return Nothing
1079 -- Compilation "succeeded", and may or may not have returned a new
1080 -- linkable (depending on whether compilation was actually performed
1082 CompOK new_details new_iface new_linkable
1083 -> do let new_info = HomeModInfo { hm_iface = new_iface,
1084 hm_details = new_details,
1085 hm_linkable = new_linkable }
1086 return (Just new_info)
1089 -- Filter modules in the HPT
1090 retainInTopLevelEnvs :: [Module] -> HomePackageTable -> HomePackageTable
1091 retainInTopLevelEnvs keep_these hpt
1092 = mkModuleEnv [ (mod, expectJust "retain" mb_mod_info)
1094 , let mb_mod_info = lookupModuleEnv hpt mod
1095 , isJust mb_mod_info ]
1097 -- ---------------------------------------------------------------------------
1098 -- Topological sort of the module graph
1101 :: Bool -- Drop hi-boot nodes? (see below)
1105 -- Calculate SCCs of the module graph, possibly dropping the hi-boot nodes
1106 -- The resulting list of strongly-connected-components is in topologically
1107 -- sorted order, starting with the module(s) at the bottom of the
1108 -- dependency graph (ie compile them first) and ending with the ones at
1111 -- Drop hi-boot nodes (first boolean arg)?
1113 -- False: treat the hi-boot summaries as nodes of the graph,
1114 -- so the graph must be acyclic
1116 -- True: eliminate the hi-boot nodes, and instead pretend
1117 -- the a source-import of Foo is an import of Foo
1118 -- The resulting graph has no hi-boot nodes, but can by cyclic
1120 topSortModuleGraph drop_hs_boot_nodes summaries Nothing
1121 = stronglyConnComp (fst (moduleGraphNodes drop_hs_boot_nodes summaries))
1122 topSortModuleGraph drop_hs_boot_nodes summaries (Just mod)
1123 = stronglyConnComp (map vertex_fn (reachable graph root))
1125 -- restrict the graph to just those modules reachable from
1126 -- the specified module. We do this by building a graph with
1127 -- the full set of nodes, and determining the reachable set from
1128 -- the specified node.
1129 (nodes, lookup_key) = moduleGraphNodes drop_hs_boot_nodes summaries
1130 (graph, vertex_fn, key_fn) = graphFromEdges' nodes
1132 | Just key <- lookup_key HsSrcFile mod, Just v <- key_fn key = v
1133 | otherwise = throwDyn (ProgramError "module does not exist")
1135 moduleGraphNodes :: Bool -> [ModSummary]
1136 -> ([(ModSummary, Int, [Int])], HscSource -> Module -> Maybe Int)
1137 moduleGraphNodes drop_hs_boot_nodes summaries = (nodes, lookup_key)
1139 -- Drop hs-boot nodes by using HsSrcFile as the key
1140 hs_boot_key | drop_hs_boot_nodes = HsSrcFile
1141 | otherwise = HsBootFile
1143 -- We use integers as the keys for the SCC algorithm
1144 nodes :: [(ModSummary, Int, [Int])]
1145 nodes = [(s, expectJust "topSort" (lookup_key (ms_hsc_src s) (ms_mod s)),
1146 out_edge_keys hs_boot_key (ms_srcimps s) ++
1147 out_edge_keys HsSrcFile (ms_imps s) )
1149 , not (isBootSummary s && drop_hs_boot_nodes) ]
1150 -- Drop the hi-boot ones if told to do so
1152 key_map :: NodeMap Int
1153 key_map = listToFM ([(ms_mod s, ms_hsc_src s) | s <- summaries]
1156 lookup_key :: HscSource -> Module -> Maybe Int
1157 lookup_key hs_src mod = lookupFM key_map (mod, hs_src)
1159 out_edge_keys :: HscSource -> [Module] -> [Int]
1160 out_edge_keys hi_boot ms = mapCatMaybes (lookup_key hi_boot) ms
1161 -- If we want keep_hi_boot_nodes, then we do lookup_key with
1162 -- the IsBootInterface parameter True; else False
1165 type NodeKey = (Module, HscSource) -- The nodes of the graph are
1166 type NodeMap a = FiniteMap NodeKey a -- keyed by (mod, src_file_type) pairs
1168 msKey :: ModSummary -> NodeKey
1169 msKey (ModSummary { ms_mod = mod, ms_hsc_src = boot }) = (mod,boot)
1171 emptyNodeMap :: NodeMap a
1172 emptyNodeMap = emptyFM
1174 mkNodeMap :: [ModSummary] -> NodeMap ModSummary
1175 mkNodeMap summaries = listToFM [ (msKey s, s) | s <- summaries]
1177 nodeMapElts :: NodeMap a -> [a]
1178 nodeMapElts = eltsFM
1180 -- -----------------------------------------------------------------
1181 -- The unlinked image
1183 -- The compilation manager keeps a list of compiled, but as-yet unlinked
1184 -- binaries (byte code or object code). Even when it links bytecode
1185 -- it keeps the unlinked version so it can re-link it later without
1188 type UnlinkedImage = [Linkable] -- the unlinked images (should be a set, really)
1190 findModuleLinkable_maybe :: [Linkable] -> Module -> Maybe Linkable
1191 findModuleLinkable_maybe lis mod
1192 = case [LM time nm us | LM time nm us <- lis, nm == mod] of
1195 many -> pprPanic "findModuleLinkable" (ppr mod)
1197 delModuleLinkable :: [Linkable] -> Module -> [Linkable]
1198 delModuleLinkable ls mod = [ l | l@(LM _ nm _) <- ls, nm /= mod ]
1200 -----------------------------------------------------------------------------
1201 -- Downsweep (dependency analysis)
1203 -- Chase downwards from the specified root set, returning summaries
1204 -- for all home modules encountered. Only follow source-import
1207 -- We pass in the previous collection of summaries, which is used as a
1208 -- cache to avoid recalculating a module summary if the source is
1211 -- The returned list of [ModSummary] nodes has one node for each home-package
1212 -- module, plus one for any hs-boot files. The imports of these nodes
1213 -- are all there, including the imports of non-home-package modules.
1216 -> [ModSummary] -- Old summaries
1217 -> [Module] -- Ignore dependencies on these; treat them as
1218 -- if they were package modules
1220 downsweep hsc_env old_summaries excl_mods
1221 = do rootSummaries <- mapM getRootSummary roots
1222 checkDuplicates rootSummaries
1223 loop (concatMap msDeps rootSummaries)
1224 (mkNodeMap rootSummaries)
1226 roots = hsc_targets hsc_env
1228 old_summary_map :: NodeMap ModSummary
1229 old_summary_map = mkNodeMap old_summaries
1231 getRootSummary :: Target -> IO ModSummary
1232 getRootSummary (Target (TargetFile file mb_phase) maybe_buf)
1233 = do exists <- doesFileExist file
1235 then summariseFile hsc_env old_summaries file mb_phase maybe_buf
1237 throwDyn (CmdLineError ("can't find file: " ++ file))
1238 getRootSummary (Target (TargetModule modl) maybe_buf)
1239 = do maybe_summary <- summariseModule hsc_env old_summary_map Nothing False
1240 modl maybe_buf excl_mods
1241 case maybe_summary of
1242 Nothing -> packageModErr modl
1245 -- In a root module, the filename is allowed to diverge from the module
1246 -- name, so we have to check that there aren't multiple root files
1247 -- defining the same module (otherwise the duplicates will be silently
1248 -- ignored, leading to confusing behaviour).
1249 checkDuplicates :: [ModSummary] -> IO ()
1250 checkDuplicates summaries = mapM_ check summaries
1255 many -> multiRootsErr modl many
1256 where modl = ms_mod summ
1258 [ expectJust "checkDup" (ml_hs_file (ms_location summ'))
1259 | summ' <- summaries, ms_mod summ' == modl ]
1261 loop :: [(FilePath,Module,IsBootInterface)]
1262 -- Work list: process these modules
1263 -> NodeMap ModSummary
1266 -- The result includes the worklist, except
1267 -- for those mentioned in the visited set
1268 loop [] done = return (nodeMapElts done)
1269 loop ((cur_path, wanted_mod, is_boot) : ss) done
1270 | key `elemFM` done = loop ss done
1271 | otherwise = do { mb_s <- summariseModule hsc_env old_summary_map
1272 (Just cur_path) is_boot
1273 wanted_mod Nothing excl_mods
1275 Nothing -> loop ss done
1276 Just s -> loop (msDeps s ++ ss)
1277 (addToFM done key s) }
1279 key = (wanted_mod, if is_boot then HsBootFile else HsSrcFile)
1281 msDeps :: ModSummary -> [(FilePath, -- Importing module
1282 Module, -- Imported module
1283 IsBootInterface)] -- {-# SOURCE #-} import or not
1284 -- (msDeps s) returns the dependencies of the ModSummary s.
1285 -- A wrinkle is that for a {-# SOURCE #-} import we return
1286 -- *both* the hs-boot file
1287 -- *and* the source file
1288 -- as "dependencies". That ensures that the list of all relevant
1289 -- modules always contains B.hs if it contains B.hs-boot.
1290 -- Remember, this pass isn't doing the topological sort. It's
1291 -- just gathering the list of all relevant ModSummaries
1292 msDeps s = concat [ [(f, m, True), (f,m,False)] | m <- ms_srcimps s]
1293 ++ [(f,m,False) | m <- ms_imps s]
1295 f = msHsFilePath s -- Keep the importing module for error reporting
1298 -----------------------------------------------------------------------------
1299 -- Summarising modules
1301 -- We have two types of summarisation:
1303 -- * Summarise a file. This is used for the root module(s) passed to
1304 -- cmLoadModules. The file is read, and used to determine the root
1305 -- module name. The module name may differ from the filename.
1307 -- * Summarise a module. We are given a module name, and must provide
1308 -- a summary. The finder is used to locate the file in which the module
1313 -> [ModSummary] -- old summaries
1314 -> FilePath -- source file name
1315 -> Maybe Phase -- start phase
1316 -> Maybe (StringBuffer,ClockTime)
1319 summariseFile hsc_env old_summaries file mb_phase maybe_buf
1320 -- we can use a cached summary if one is available and the
1321 -- source file hasn't changed, But we have to look up the summary
1322 -- by source file, rather than module name as we do in summarise.
1323 | Just old_summary <- findSummaryBySourceFile old_summaries file
1325 let location = ms_location old_summary
1327 -- return the cached summary if the source didn't change
1328 src_timestamp <- case maybe_buf of
1329 Just (_,t) -> return t
1330 Nothing -> getModificationTime file
1332 if ms_hs_date old_summary == src_timestamp
1333 then do -- update the object-file timestamp
1334 obj_timestamp <- getObjTimestamp location False
1335 return old_summary{ ms_obj_date = obj_timestamp }
1343 let dflags = hsc_dflags hsc_env
1345 (dflags', hspp_fn, buf)
1346 <- preprocessFile dflags file mb_phase maybe_buf
1348 (srcimps,the_imps,mod) <- getImports dflags' buf hspp_fn
1350 -- Make a ModLocation for this file
1351 location <- mkHomeModLocation dflags mod file
1353 -- Tell the Finder cache where it is, so that subsequent calls
1354 -- to findModule will find it, even if it's not on any search path
1355 addHomeModuleToFinder hsc_env mod location
1357 src_timestamp <- case maybe_buf of
1358 Just (_,t) -> return t
1359 Nothing -> getModificationTime file
1361 obj_timestamp <- modificationTimeIfExists (ml_obj_file location)
1363 return (ModSummary { ms_mod = mod, ms_hsc_src = HsSrcFile,
1364 ms_location = location,
1365 ms_hspp_file = Just hspp_fn,
1366 ms_hspp_buf = Just buf,
1367 ms_srcimps = srcimps, ms_imps = the_imps,
1368 ms_hs_date = src_timestamp,
1369 ms_obj_date = obj_timestamp })
1371 findSummaryBySourceFile :: [ModSummary] -> FilePath -> Maybe ModSummary
1372 findSummaryBySourceFile summaries file
1373 = case [ ms | ms <- summaries, HsSrcFile <- [ms_hsc_src ms],
1374 fromJust (ml_hs_file (ms_location ms)) == file ] of
1378 -- Summarise a module, and pick up source and timestamp.
1381 -> NodeMap ModSummary -- Map of old summaries
1382 -> Maybe FilePath -- Importing module (for error messages)
1383 -> IsBootInterface -- True <=> a {-# SOURCE #-} import
1384 -> Module -- Imported module to be summarised
1385 -> Maybe (StringBuffer, ClockTime)
1386 -> [Module] -- Modules to exclude
1387 -> IO (Maybe ModSummary) -- Its new summary
1389 summariseModule hsc_env old_summary_map cur_mod is_boot wanted_mod maybe_buf excl_mods
1390 | wanted_mod `elem` excl_mods
1393 | Just old_summary <- lookupFM old_summary_map (wanted_mod, hsc_src)
1394 = do -- Find its new timestamp; all the
1395 -- ModSummaries in the old map have valid ml_hs_files
1396 let location = ms_location old_summary
1397 src_fn = expectJust "summariseModule" (ml_hs_file location)
1399 -- return the cached summary if the source didn't change
1400 src_timestamp <- case maybe_buf of
1401 Just (_,t) -> return t
1402 Nothing -> getModificationTime src_fn
1404 if ms_hs_date old_summary == src_timestamp
1405 then do -- update the object-file timestamp
1406 obj_timestamp <- getObjTimestamp location is_boot
1407 return (Just old_summary{ ms_obj_date = obj_timestamp })
1409 -- source changed: re-summarise
1410 new_summary location src_fn maybe_buf src_timestamp
1413 = do found <- findModule hsc_env wanted_mod True {-explicit-}
1416 | not (isHomePackage pkg) -> return Nothing
1417 -- Drop external-pkg
1418 | isJust (ml_hs_file location) -> just_found location
1420 err -> noModError dflags cur_mod wanted_mod err
1423 dflags = hsc_dflags hsc_env
1425 hsc_src = if is_boot then HsBootFile else HsSrcFile
1427 just_found location = do
1428 -- Adjust location to point to the hs-boot source file,
1429 -- hi file, object file, when is_boot says so
1430 let location' | is_boot = addBootSuffixLocn location
1431 | otherwise = location
1432 src_fn = expectJust "summarise2" (ml_hs_file location')
1434 -- Check that it exists
1435 -- It might have been deleted since the Finder last found it
1436 maybe_t <- modificationTimeIfExists src_fn
1438 Nothing -> noHsFileErr cur_mod src_fn
1439 Just t -> new_summary location' src_fn Nothing t
1442 new_summary location src_fn maybe_bug src_timestamp
1444 -- Preprocess the source file and get its imports
1445 -- The dflags' contains the OPTIONS pragmas
1446 (dflags', hspp_fn, buf) <- preprocessFile dflags src_fn Nothing maybe_buf
1447 (srcimps, the_imps, mod_name) <- getImports dflags' buf hspp_fn
1449 when (mod_name /= wanted_mod) $
1450 throwDyn (ProgramError
1451 (showSDoc (text src_fn
1452 <> text ": file name does not match module name"
1453 <+> quotes (ppr mod_name))))
1455 -- Find the object timestamp, and return the summary
1456 obj_timestamp <- getObjTimestamp location is_boot
1458 return (Just ( ModSummary { ms_mod = wanted_mod,
1459 ms_hsc_src = hsc_src,
1460 ms_location = location,
1461 ms_hspp_file = Just hspp_fn,
1462 ms_hspp_buf = Just buf,
1463 ms_srcimps = srcimps,
1465 ms_hs_date = src_timestamp,
1466 ms_obj_date = obj_timestamp }))
1469 getObjTimestamp location is_boot
1470 = if is_boot then return Nothing
1471 else modificationTimeIfExists (ml_obj_file location)
1474 preprocessFile :: DynFlags -> FilePath -> Maybe Phase -> Maybe (StringBuffer,ClockTime)
1475 -> IO (DynFlags, FilePath, StringBuffer)
1476 preprocessFile dflags src_fn mb_phase Nothing
1478 (dflags', hspp_fn) <- preprocess dflags (src_fn, mb_phase)
1479 buf <- hGetStringBuffer hspp_fn
1480 return (dflags', hspp_fn, buf)
1482 preprocessFile dflags src_fn mb_phase (Just (buf, time))
1484 -- case we bypass the preprocessing stage?
1486 local_opts = getOptionsFromStringBuffer buf
1488 (dflags', errs) <- parseDynamicFlags dflags (map snd local_opts)
1492 | Just (Unlit _) <- mb_phase = True
1493 | Nothing <- mb_phase, Unlit _ <- startPhase src_fn = True
1494 -- note: local_opts is only required if there's no Unlit phase
1495 | dopt Opt_Cpp dflags' = True
1496 | dopt Opt_Pp dflags' = True
1499 when needs_preprocessing $
1500 ghcError (ProgramError "buffer needs preprocesing; interactive check disabled")
1502 return (dflags', src_fn, buf)
1505 -----------------------------------------------------------------------------
1507 -----------------------------------------------------------------------------
1509 noModError :: DynFlags -> Maybe FilePath -> Module -> FindResult -> IO ab
1510 -- ToDo: we don't have a proper line number for this error
1511 noModError dflags cur_mod wanted_mod err
1512 = throwDyn $ ProgramError $ showSDoc $
1513 vcat [cantFindError dflags wanted_mod err,
1514 nest 2 (parens (pp_where cur_mod))]
1516 noHsFileErr cur_mod path
1517 = throwDyn $ CmdLineError $ showSDoc $
1518 vcat [text "Can't find" <+> text path,
1519 nest 2 (parens (pp_where cur_mod))]
1521 pp_where Nothing = text "one of the roots of the dependency analysis"
1522 pp_where (Just p) = text "imported from" <+> text p
1525 = throwDyn (CmdLineError (showSDoc (text "module" <+>
1526 quotes (ppr mod) <+>
1527 text "is a package module")))
1529 multiRootsErr mod files
1530 = throwDyn (ProgramError (showSDoc (
1531 text "module" <+> quotes (ppr mod) <+>
1532 text "is defined in multiple files:" <+>
1533 sep (map text files))))
1535 cyclicModuleErr :: [ModSummary] -> SDoc
1537 = hang (ptext SLIT("Module imports form a cycle for modules:"))
1538 2 (vcat (map show_one ms))
1540 show_one ms = sep [ show_mod (ms_hsc_src ms) (ms_mod ms),
1541 nest 2 $ ptext SLIT("imports:") <+>
1542 (pp_imps HsBootFile (ms_srcimps ms)
1543 $$ pp_imps HsSrcFile (ms_imps ms))]
1544 show_mod hsc_src mod = ppr mod <> text (hscSourceString hsc_src)
1545 pp_imps src mods = fsep (map (show_mod src) mods)
1548 -- | Inform GHC that the working directory has changed. GHC will flush
1549 -- its cache of module locations, since it may no longer be valid.
1550 -- Note: if you change the working directory, you should also unload
1551 -- the current program (set targets to empty, followed by load).
1552 workingDirectoryChanged :: Session -> IO ()
1553 workingDirectoryChanged s = withSession s $ \hsc_env ->
1554 flushFinderCache (hsc_FC hsc_env)
1556 -- -----------------------------------------------------------------------------
1557 -- inspecting the session
1559 -- | Get the module dependency graph.
1560 getModuleGraph :: Session -> IO ModuleGraph -- ToDo: DiGraph ModSummary
1561 getModuleGraph s = withSession s (return . hsc_mod_graph)
1563 isLoaded :: Session -> Module -> IO Bool
1564 isLoaded s m = withSession s $ \hsc_env ->
1565 return $! isJust (lookupModuleEnv (hsc_HPT hsc_env) m)
1567 getBindings :: Session -> IO [TyThing]
1568 getBindings s = withSession s (return . nameEnvElts . ic_type_env . hsc_IC)
1570 getPrintUnqual :: Session -> IO PrintUnqualified
1571 getPrintUnqual s = withSession s (return . icPrintUnqual . hsc_IC)
1573 -- | Container for information about a 'Module'.
1574 data ModuleInfo = ModuleInfo {
1575 minf_type_env :: TypeEnv,
1576 minf_exports :: NameSet,
1577 minf_rdr_env :: Maybe GlobalRdrEnv, -- Nothing for a compiled/package mod
1578 minf_instances :: [Instance]
1579 -- ToDo: this should really contain the ModIface too
1581 -- We don't want HomeModInfo here, because a ModuleInfo applies
1582 -- to package modules too.
1584 -- | Request information about a loaded 'Module'
1585 getModuleInfo :: Session -> Module -> IO (Maybe ModuleInfo)
1586 getModuleInfo s mdl = withSession s $ \hsc_env -> do
1587 case lookupModuleEnv (hsc_HPT hsc_env) mdl of
1590 mb_names <- getModuleExports hsc_env mdl
1592 Nothing -> return Nothing
1594 eps <- readIORef (hsc_EPS hsc_env)
1597 n_list = nameSetToList names
1598 tys = [ ty | name <- n_list,
1599 Just ty <- [lookupTypeEnv pte name] ]
1601 return (Just (ModuleInfo {
1602 minf_type_env = mkTypeEnv tys,
1603 minf_exports = names,
1604 minf_rdr_env = Just $! nameSetToGlobalRdrEnv names mdl,
1605 minf_instances = error "getModuleInfo: instances for package module unimplemented"
1608 -- bogusly different for non-GHCI (ToDo)
1612 let details = hm_details hmi in
1613 return (Just (ModuleInfo {
1614 minf_type_env = md_types details,
1615 minf_exports = md_exports details,
1616 minf_rdr_env = mi_globals $! hm_iface hmi,
1617 minf_instances = md_insts details
1620 -- ToDo: we should be able to call getModuleInfo on a package module,
1621 -- even one that isn't loaded yet.
1623 -- | The list of top-level entities defined in a module
1624 modInfoTyThings :: ModuleInfo -> [TyThing]
1625 modInfoTyThings minf = typeEnvElts (minf_type_env minf)
1627 modInfoTopLevelScope :: ModuleInfo -> Maybe [Name]
1628 modInfoTopLevelScope minf
1629 = fmap (map gre_name . globalRdrEnvElts) (minf_rdr_env minf)
1631 modInfoExports :: ModuleInfo -> [Name]
1632 modInfoExports minf = nameSetToList $! minf_exports minf
1634 -- | Returns the instances defined by the specified module.
1635 -- Warning: currently unimplemented for package modules.
1636 modInfoInstances :: ModuleInfo -> [Instance]
1637 modInfoInstances = minf_instances
1639 modInfoIsExportedName :: ModuleInfo -> Name -> Bool
1640 modInfoIsExportedName minf name = elemNameSet name (minf_exports minf)
1642 modInfoPrintUnqualified :: ModuleInfo -> Maybe PrintUnqualified
1643 modInfoPrintUnqualified minf = fmap unQualInScope (minf_rdr_env minf)
1645 modInfoLookupName :: Session -> ModuleInfo -> Name -> IO (Maybe TyThing)
1646 modInfoLookupName s minf name = withSession s $ \hsc_env -> do
1647 case lookupTypeEnv (minf_type_env minf) name of
1648 Just tyThing -> return (Just tyThing)
1650 eps <- readIORef (hsc_EPS hsc_env)
1651 return $! lookupType (hsc_HPT hsc_env) (eps_PTE eps) name
1653 isDictonaryId :: Id -> Bool
1655 = case tcSplitSigmaTy (idType id) of { (tvs, theta, tau) -> isDictTy tau }
1657 -- | Looks up a global name: that is, any top-level name in any
1658 -- visible module. Unlike 'lookupName', lookupGlobalName does not use
1659 -- the interactive context, and therefore does not require a preceding
1661 lookupGlobalName :: Session -> Name -> IO (Maybe TyThing)
1662 lookupGlobalName s name = withSession s $ \hsc_env -> do
1663 eps <- readIORef (hsc_EPS hsc_env)
1664 return $! lookupType (hsc_HPT hsc_env) (eps_PTE eps) name
1670 | BinaryCode FilePath
1672 -- ToDo: typechecks abstract syntax or renamed abstract syntax. Issues:
1673 -- - typechecked syntax includes extra dictionary translation and
1674 -- AbsBinds which need to be translated back into something closer to
1675 -- the original source.
1678 -- - Data and Typeable instances for HsSyn.
1681 -- - things that aren't in the output of the renamer:
1682 -- - the export list
1686 -- - things that aren't in the output of the typechecker right now:
1687 -- - the export list
1689 -- - type signatures
1690 -- - type/data/newtype declarations
1691 -- - class declarations
1693 -- - extra things in the typechecker's output:
1694 -- - default methods are turned into top-level decls.
1695 -- - dictionary bindings
1697 -- ToDo: check for small transformations that happen to the syntax in
1698 -- the typechecker (eg. -e ==> negate e, perhaps for fromIntegral)
1700 -- ToDo: maybe use TH syntax instead of IfaceSyn? There's already a way
1701 -- to get from TyCons, Ids etc. to TH syntax (reify).
1703 -- :browse will use either lm_toplev or inspect lm_interface, depending
1704 -- on whether the module is interpreted or not.
1706 -- This is for reconstructing refactored source code
1707 -- Calls the lexer repeatedly.
1708 -- ToDo: add comment tokens to token stream
1709 getTokenStream :: Session -> Module -> IO [Located Token]
1712 -- -----------------------------------------------------------------------------
1713 -- Interactive evaluation
1717 -- | Set the interactive evaluation context.
1719 -- Setting the context doesn't throw away any bindings; the bindings
1720 -- we've built up in the InteractiveContext simply move to the new
1721 -- module. They always shadow anything in scope in the current context.
1722 setContext :: Session
1723 -> [Module] -- entire top level scope of these modules
1724 -> [Module] -- exports only of these modules
1726 setContext (Session ref) toplevs exports = do
1727 hsc_env <- readIORef ref
1728 let old_ic = hsc_IC hsc_env
1729 hpt = hsc_HPT hsc_env
1731 mapM_ (checkModuleExists hsc_env hpt) exports
1732 export_env <- mkExportEnv hsc_env exports
1733 toplev_envs <- mapM (mkTopLevEnv hpt) toplevs
1734 let all_env = foldr plusGlobalRdrEnv export_env toplev_envs
1735 writeIORef ref hsc_env{ hsc_IC = old_ic { ic_toplev_scope = toplevs,
1736 ic_exports = exports,
1737 ic_rn_gbl_env = all_env } }
1739 -- Make a GlobalRdrEnv based on the exports of the modules only.
1740 mkExportEnv :: HscEnv -> [Module] -> IO GlobalRdrEnv
1741 mkExportEnv hsc_env mods = do
1742 mb_name_sets <- mapM (getModuleExports hsc_env) mods
1744 gres = [ nameSetToGlobalRdrEnv name_set mod
1745 | (Just name_set, mod) <- zip mb_name_sets mods ]
1747 return $! foldr plusGlobalRdrEnv emptyGlobalRdrEnv gres
1749 nameSetToGlobalRdrEnv :: NameSet -> Module -> GlobalRdrEnv
1750 nameSetToGlobalRdrEnv names mod =
1751 mkGlobalRdrEnv [ GRE { gre_name = name, gre_prov = vanillaProv mod }
1752 | name <- nameSetToList names ]
1754 vanillaProv :: Module -> Provenance
1755 -- We're building a GlobalRdrEnv as if the user imported
1756 -- all the specified modules into the global interactive module
1757 vanillaProv mod = Imported [ImportSpec { is_mod = mod, is_as = mod,
1758 is_qual = False, is_explicit = False,
1759 is_loc = srcLocSpan interactiveSrcLoc }]
1761 checkModuleExists :: HscEnv -> HomePackageTable -> Module -> IO ()
1762 checkModuleExists hsc_env hpt mod =
1763 case lookupModuleEnv hpt mod of
1764 Just mod_info -> return ()
1765 _not_a_home_module -> do
1766 res <- findPackageModule hsc_env mod True
1768 Found _ _ -> return ()
1769 err -> let msg = cantFindError (hsc_dflags hsc_env) mod err in
1770 throwDyn (CmdLineError (showSDoc msg))
1772 mkTopLevEnv :: HomePackageTable -> Module -> IO GlobalRdrEnv
1773 mkTopLevEnv hpt modl
1774 = case lookupModuleEnv hpt modl of
1776 throwDyn (ProgramError ("mkTopLevEnv: not a home module "
1777 ++ showSDoc (pprModule modl)))
1779 case mi_globals (hm_iface details) of
1781 throwDyn (ProgramError ("mkTopLevEnv: not interpreted "
1782 ++ showSDoc (pprModule modl)))
1783 Just env -> return env
1785 -- | Get the interactive evaluation context, consisting of a pair of the
1786 -- set of modules from which we take the full top-level scope, and the set
1787 -- of modules from which we take just the exports respectively.
1788 getContext :: Session -> IO ([Module],[Module])
1789 getContext s = withSession s (\HscEnv{ hsc_IC=ic } ->
1790 return (ic_toplev_scope ic, ic_exports ic))
1792 -- | Returns 'True' if the specified module is interpreted, and hence has
1793 -- its full top-level scope available.
1794 moduleIsInterpreted :: Session -> Module -> IO Bool
1795 moduleIsInterpreted s modl = withSession s $ \h ->
1796 case lookupModuleEnv (hsc_HPT h) modl of
1797 Just details -> return (isJust (mi_globals (hm_iface details)))
1798 _not_a_home_module -> return False
1800 -- | Looks up an identifier in the current interactive context (for :info)
1801 {-# DEPRECATED getInfo "we should be using parseName/lookupName instead" #-}
1802 getInfo :: Session -> String -> IO [GetInfoResult]
1803 getInfo s id = withSession s $ \hsc_env -> hscGetInfo hsc_env id
1805 -- | Returns all names in scope in the current interactive context
1806 getNamesInScope :: Session -> IO [Name]
1807 getNamesInScope s = withSession s $ \hsc_env -> do
1808 return (map gre_name (globalRdrEnvElts (ic_rn_gbl_env (hsc_IC hsc_env))))
1810 -- | Parses a string as an identifier, and returns the list of 'Name's that
1811 -- the identifier can refer to in the current interactive context.
1812 parseName :: Session -> String -> IO [Name]
1813 parseName s str = withSession s $ \hsc_env -> do
1814 maybe_rdr_name <- hscParseIdentifier (hsc_dflags hsc_env) str
1815 case maybe_rdr_name of
1816 Nothing -> return []
1817 Just (L _ rdr_name) -> do
1818 mb_names <- tcRnLookupRdrName hsc_env rdr_name
1820 Nothing -> return []
1821 Just ns -> return ns
1822 -- ToDo: should return error messages
1824 -- | Returns the 'TyThing' for a 'Name'. The 'Name' may refer to any
1825 -- entity known to GHC, including 'Name's defined using 'runStmt'.
1826 lookupName :: Session -> Name -> IO (Maybe TyThing)
1827 lookupName s name = withSession s $ \hsc_env -> do
1828 case lookupTypeEnv (ic_type_env (hsc_IC hsc_env)) name of
1829 Just tt -> return (Just tt)
1831 eps <- readIORef (hsc_EPS hsc_env)
1832 return $! lookupType (hsc_HPT hsc_env) (eps_PTE eps) name
1834 -- -----------------------------------------------------------------------------
1835 -- Getting the type of an expression
1837 -- | Get the type of an expression
1838 exprType :: Session -> String -> IO (Maybe Type)
1839 exprType s expr = withSession s $ \hsc_env -> do
1840 maybe_stuff <- hscTcExpr hsc_env expr
1842 Nothing -> return Nothing
1843 Just ty -> return (Just tidy_ty)
1845 tidy_ty = tidyType emptyTidyEnv ty
1846 dflags = hsc_dflags hsc_env
1848 -- -----------------------------------------------------------------------------
1849 -- Getting the kind of a type
1851 -- | Get the kind of a type
1852 typeKind :: Session -> String -> IO (Maybe Kind)
1853 typeKind s str = withSession s $ \hsc_env -> do
1854 maybe_stuff <- hscKcType hsc_env str
1856 Nothing -> return Nothing
1857 Just kind -> return (Just kind)
1859 -----------------------------------------------------------------------------
1860 -- cmCompileExpr: compile an expression and deliver an HValue
1862 compileExpr :: Session -> String -> IO (Maybe HValue)
1863 compileExpr s expr = withSession s $ \hsc_env -> do
1864 maybe_stuff <- hscStmt hsc_env ("let __cmCompileExpr = "++expr)
1866 Nothing -> return Nothing
1867 Just (new_ic, names, hval) -> do
1869 hvals <- (unsafeCoerce# hval) :: IO [HValue]
1871 case (names,hvals) of
1872 ([n],[hv]) -> return (Just hv)
1873 _ -> panic "compileExpr"
1875 -- -----------------------------------------------------------------------------
1876 -- running a statement interactively
1879 = RunOk [Name] -- ^ names bound by this evaluation
1880 | RunFailed -- ^ statement failed compilation
1881 | RunException Exception -- ^ statement raised an exception
1883 -- | Run a statement in the current interactive context. Statemenet
1884 -- may bind multple values.
1885 runStmt :: Session -> String -> IO RunResult
1886 runStmt (Session ref) expr
1888 hsc_env <- readIORef ref
1890 -- Turn off -fwarn-unused-bindings when running a statement, to hide
1891 -- warnings about the implicit bindings we introduce.
1892 let dflags' = dopt_unset (hsc_dflags hsc_env) Opt_WarnUnusedBinds
1893 hsc_env' = hsc_env{ hsc_dflags = dflags' }
1895 maybe_stuff <- hscStmt hsc_env' expr
1898 Nothing -> return RunFailed
1899 Just (new_hsc_env, names, hval) -> do
1901 let thing_to_run = unsafeCoerce# hval :: IO [HValue]
1902 either_hvals <- sandboxIO thing_to_run
1904 case either_hvals of
1906 -- on error, keep the *old* interactive context,
1907 -- so that 'it' is not bound to something
1908 -- that doesn't exist.
1909 return (RunException e)
1912 -- Get the newly bound things, and bind them.
1913 -- Don't need to delete any shadowed bindings;
1914 -- the new ones override the old ones.
1915 extendLinkEnv (zip names hvals)
1917 writeIORef ref new_hsc_env
1918 return (RunOk names)
1921 -- We run the statement in a "sandbox" to protect the rest of the
1922 -- system from anything the expression might do. For now, this
1923 -- consists of just wrapping it in an exception handler, but see below
1924 -- for another version.
1926 sandboxIO :: IO a -> IO (Either Exception a)
1927 sandboxIO thing = Exception.try thing
1930 -- This version of sandboxIO runs the expression in a completely new
1931 -- RTS main thread. It is disabled for now because ^C exceptions
1932 -- won't be delivered to the new thread, instead they'll be delivered
1933 -- to the (blocked) GHCi main thread.
1935 -- SLPJ: when re-enabling this, reflect a wrong-stat error as an exception
1937 sandboxIO :: IO a -> IO (Either Int (Either Exception a))
1938 sandboxIO thing = do
1939 st_thing <- newStablePtr (Exception.try thing)
1940 alloca $ \ p_st_result -> do
1941 stat <- rts_evalStableIO st_thing p_st_result
1942 freeStablePtr st_thing
1944 then do st_result <- peek p_st_result
1945 result <- deRefStablePtr st_result
1946 freeStablePtr st_result
1947 return (Right result)
1949 return (Left (fromIntegral stat))
1951 foreign import "rts_evalStableIO" {- safe -}
1952 rts_evalStableIO :: StablePtr (IO a) -> Ptr (StablePtr a) -> IO CInt
1953 -- more informative than the C type!
1956 -- ---------------------------------------------------------------------------
1957 -- cmBrowseModule: get all the TyThings defined in a module
1959 {-# DEPRECATED browseModule "we should be using getModuleInfo instead" #-}
1960 browseModule :: Session -> Module -> Bool -> IO [IfaceDecl]
1961 browseModule s modl exports_only = withSession s $ \hsc_env -> do
1962 mb_decls <- getModuleContents hsc_env modl exports_only
1964 Nothing -> return [] -- An error of some kind
1965 Just ds -> return ds
1968 -----------------------------------------------------------------------------
1969 -- show a module and it's source/object filenames
1971 showModule :: Session -> ModSummary -> IO String
1972 showModule s mod_summary = withSession s $ \hsc_env -> do
1973 case lookupModuleEnv (hsc_HPT hsc_env) (ms_mod mod_summary) of
1974 Nothing -> panic "missing linkable"
1975 Just mod_info -> return (showModMsg obj_linkable mod_summary)
1977 obj_linkable = isObjectLinkable (fromJust (hm_linkable mod_info))