2 % (c) The GRASP/AQUA Project, Glasgow University, 1993-2000
5 -- | Main API for compiling plain Haskell source code.
7 -- This module implements compilation of a Haskell source. It is
8 -- /not/ concerned with preprocessing of source files; this is handled
9 -- in "DriverPipeline".
11 -- There are various entry points depending on what mode we're in:
12 -- "batch" mode (@--make@), "one-shot" mode (@-c@, @-S@ etc.), and
13 -- "interactive" mode (GHCi). There are also entry points for
14 -- individual passes: parsing, typechecking/renaming, desugaring, and
17 -- All the functions here take an 'HscEnv' as a parameter, but none of
18 -- them return a new one: 'HscEnv' is treated as an immutable value
19 -- from here on in (although it has mutable components, for the
22 -- Warning messages are dealt with consistently throughout this API:
23 -- during compilation warnings are collected, and before any function
24 -- in @HscMain@ returns, the warnings are either printed, or turned
25 -- into a real compialtion error if the @-Werror@ flag is enabled.
32 -- * Compiling complete source files
35 , InteractiveStatus, HscStatus
39 , hscCompileInteractive
43 -- * Running passes separately
49 , hscSimplify -- ToDo, shouldn't really export this
52 , hscOneShotBackendOnly
54 , hscNothingBackendOnly
55 , hscInteractiveBackendOnly
57 -- * Support for interactive evaluation
64 , hscTcRnLookupRdrName
65 , hscStmt, hscStmtWithLocation
66 , hscTcExpr, hscImport, hscKcType
73 import ByteCodeGen ( byteCodeGen, coreExprToBCOs )
74 import Linker ( HValue, linkExpr )
75 import CoreTidy ( tidyExpr )
77 import TcType ( tyVarsOfTypes )
78 import PrelNames ( iNTERACTIVE )
79 import {- Kind parts of -} Type ( Kind )
81 import CoreLint ( lintUnfolding )
82 import DsMeta ( templateHaskellNames )
84 import VarEnv ( emptyTidyEnv )
89 import Module ( emptyModuleEnv, ModLocation(..), Module )
95 import Lexer hiding (getDynFlags)
98 import TcIface ( typecheckIface )
100 import IfaceEnv ( initNameCache )
101 import LoadIface ( ifaceStats, initExternalPackageState )
102 import PrelInfo ( wiredInThings, basicKnownKeyNames )
108 import CoreToStg ( coreToStg )
109 import qualified StgCmm ( codeGen )
112 import TyCon ( TyCon, isDataTyCon )
113 import Name ( Name, NamedThing(..) )
114 import SimplStg ( stg2stg )
115 import CodeGen ( codeGen )
116 import OldCmm ( Cmm )
117 import PprCmm ( pprCmms )
118 import CmmParse ( parseCmmFile )
119 import CmmBuildInfoTables
122 import OptimizationFuel ( initOptFuelState )
124 import CmmContFlowOpt ( runCmmContFlowOpts )
126 import NameEnv ( emptyNameEnv )
127 import NameSet ( emptyNameSet )
129 import FamInstEnv ( emptyFamInstEnv )
130 import Fingerprint ( Fingerprint )
134 import UniqSupply ( mkSplitUniqSupply )
137 import HscStats ( ppSourceStats )
139 import MkExternalCore ( emitExternalCore )
141 import UniqFM ( emptyUFM )
142 import UniqSupply ( initUs_ )
151 #include "HsVersions.h"
154 %************************************************************************
158 %************************************************************************
161 newHscEnv :: DynFlags -> IO HscEnv
163 = do { eps_var <- newIORef initExternalPackageState
164 ; us <- mkSplitUniqSupply 'r'
165 ; nc_var <- newIORef (initNameCache us knownKeyNames)
166 ; fc_var <- newIORef emptyUFM
167 ; mlc_var <- newIORef emptyModuleEnv
168 ; optFuel <- initOptFuelState
169 ; return (HscEnv { hsc_dflags = dflags,
172 hsc_IC = emptyInteractiveContext,
173 hsc_HPT = emptyHomePackageTable,
178 hsc_OptFuel = optFuel,
179 hsc_type_env_var = Nothing } ) }
182 knownKeyNames :: [Name] -- Put here to avoid loops involving DsMeta,
183 -- where templateHaskellNames are defined
185 = map getName wiredInThings
186 ++ basicKnownKeyNames
188 ++ templateHaskellNames
191 -- -----------------------------------------------------------------------------
192 -- The Hsc monad: collecting warnings
194 newtype Hsc a = Hsc (HscEnv -> WarningMessages -> IO (a, WarningMessages))
196 instance Monad Hsc where
197 return a = Hsc $ \_ w -> return (a, w)
198 Hsc m >>= k = Hsc $ \e w -> do (a, w1) <- m e w
202 instance MonadIO Hsc where
203 liftIO io = Hsc $ \_ w -> do a <- io; return (a, w)
205 runHsc :: HscEnv -> Hsc a -> IO a
206 runHsc hsc_env (Hsc hsc) = do
207 (a, w) <- hsc hsc_env emptyBag
208 printOrThrowWarnings (hsc_dflags hsc_env) w
211 getWarnings :: Hsc WarningMessages
212 getWarnings = Hsc $ \_ w -> return (w, w)
214 clearWarnings :: Hsc ()
215 clearWarnings = Hsc $ \_ _w -> return ((), emptyBag)
217 logWarnings :: WarningMessages -> Hsc ()
218 logWarnings w = Hsc $ \_ w0 -> return ((), w0 `unionBags` w)
220 getHscEnv :: Hsc HscEnv
221 getHscEnv = Hsc $ \e w -> return (e, w)
223 getDynFlags :: Hsc DynFlags
224 getDynFlags = Hsc $ \e w -> return (hsc_dflags e, w)
226 handleWarnings :: Hsc ()
228 dflags <- getDynFlags
230 liftIO $ printOrThrowWarnings dflags w
233 -- | log warning in the monad, and if there are errors then
234 -- throw a SourceError exception.
235 logWarningsReportErrors :: Messages -> Hsc ()
236 logWarningsReportErrors (warns,errs) = do
238 when (not (isEmptyBag errs)) $ do
239 liftIO $ throwIO $ mkSrcErr errs
241 -- | Deal with errors and warnings returned by a compilation step
243 -- In order to reduce dependencies to other parts of the compiler, functions
244 -- outside the "main" parts of GHC return warnings and errors as a parameter
245 -- and signal success via by wrapping the result in a 'Maybe' type. This
246 -- function logs the returned warnings and propagates errors as exceptions
247 -- (of type 'SourceError').
249 -- This function assumes the following invariants:
251 -- 1. If the second result indicates success (is of the form 'Just x'),
252 -- there must be no error messages in the first result.
254 -- 2. If there are no error messages, but the second result indicates failure
255 -- there should be warnings in the first result. That is, if the action
256 -- failed, it must have been due to the warnings (i.e., @-Werror@).
257 ioMsgMaybe :: IO (Messages, Maybe a) -> Hsc a
259 ((warns,errs), mb_r) <- liftIO $ ioA
262 Nothing -> liftIO $ throwIO (mkSrcErr errs)
263 Just r -> ASSERT( isEmptyBag errs ) return r
265 -- | like ioMsgMaybe, except that we ignore error messages and return
266 -- 'Nothing' instead.
267 ioMsgMaybe' :: IO (Messages, Maybe a) -> Hsc (Maybe a)
269 ((warns,_errs), mb_r) <- liftIO $ ioA
273 -- -----------------------------------------------------------------------------
274 -- | Lookup things in the compiler's environment
277 hscTcRnLookupRdrName :: HscEnv -> RdrName -> IO [Name]
278 hscTcRnLookupRdrName hsc_env rdr_name =
279 runHsc hsc_env $ ioMsgMaybe $ tcRnLookupRdrName hsc_env rdr_name
282 hscTcRcLookupName :: HscEnv -> Name -> IO (Maybe TyThing)
283 hscTcRcLookupName hsc_env name =
284 runHsc hsc_env $ ioMsgMaybe' $ tcRnLookupName hsc_env name
285 -- ignore errors: the only error we're likely to get is
286 -- "name not found", and the Maybe in the return type
287 -- is used to indicate that.
289 hscTcRnGetInfo :: HscEnv -> Name -> IO (Maybe (TyThing, Fixity, [Instance]))
290 hscTcRnGetInfo hsc_env name =
291 runHsc hsc_env $ ioMsgMaybe' $ tcRnGetInfo hsc_env name
294 hscGetModuleExports :: HscEnv -> Module -> IO (Maybe [AvailInfo])
295 hscGetModuleExports hsc_env mdl =
296 runHsc hsc_env $ ioMsgMaybe' $ getModuleExports hsc_env mdl
298 -- -----------------------------------------------------------------------------
299 -- | Rename some import declarations
304 -> [LImportDecl RdrName]
307 -- It is important that we use tcRnImports instead of calling rnImports directly
308 -- because tcRnImports will force-load any orphan modules necessary, making extra
309 -- instances/family instances visible (GHC #4832)
310 hscRnImportDecls hsc_env this_mod import_decls
311 = runHsc hsc_env $ ioMsgMaybe $ initTc hsc_env HsSrcFile False this_mod $
312 fmap tcg_rdr_env $ tcRnImports hsc_env this_mod import_decls
316 -- -----------------------------------------------------------------------------
317 -- | parse a file, returning the abstract syntax
319 hscParse :: HscEnv -> ModSummary -> IO (Located (HsModule RdrName))
320 hscParse hsc_env mod_summary = runHsc hsc_env $ hscParse' mod_summary
322 -- internal version, that doesn't fail due to -Werror
323 hscParse' :: ModSummary -> Hsc (Located (HsModule RdrName))
324 hscParse' mod_summary
326 dflags <- getDynFlags
328 src_filename = ms_hspp_file mod_summary
329 maybe_src_buf = ms_hspp_buf mod_summary
331 -------------------------- Parser ----------------
332 liftIO $ showPass dflags "Parser"
333 {-# SCC "Parser" #-} do
335 -- sometimes we already have the buffer in memory, perhaps
336 -- because we needed to parse the imports out of it, or get the
338 buf <- case maybe_src_buf of
340 Nothing -> liftIO $ hGetStringBuffer src_filename
342 let loc = mkSrcLoc (mkFastString src_filename) 1 1
344 case unP parseModule (mkPState dflags buf loc) of
346 liftIO $ throwOneError (mkPlainErrMsg span err)
348 POk pst rdr_module -> do
349 logWarningsReportErrors (getMessages pst)
350 liftIO $ dumpIfSet_dyn dflags Opt_D_dump_parsed "Parser" $
352 liftIO $ dumpIfSet_dyn dflags Opt_D_source_stats "Source Statistics" $
353 ppSourceStats False rdr_module
355 -- ToDo: free the string buffer later.
357 -- XXX: should this really be a Maybe X? Check under which circumstances this
358 -- can become a Nothing and decide whether this should instead throw an
359 -- exception/signal an error.
361 (Maybe (HsGroup Name, [LImportDecl Name], Maybe [LIE Name],
364 -- | Rename and typecheck a module, additionally returning the renamed syntax
365 hscTypecheckRename :: HscEnv -> ModSummary -> Located (HsModule RdrName)
366 -> IO (TcGblEnv, RenamedStuff)
367 hscTypecheckRename hsc_env mod_summary rdr_module
368 = runHsc hsc_env $ do
370 <- {-# SCC "Typecheck-Rename" #-}
372 tcRnModule hsc_env (ms_hsc_src mod_summary) True rdr_module
374 let -- This 'do' is in the Maybe monad!
375 rn_info = do decl <- tcg_rn_decls tc_result
376 let imports = tcg_rn_imports tc_result
377 exports = tcg_rn_exports tc_result
378 doc_hdr = tcg_doc_hdr tc_result
379 return (decl,imports,exports,doc_hdr)
381 return (tc_result, rn_info)
383 -- | Convert a typechecked module to Core
384 hscDesugar :: HscEnv -> ModSummary -> TcGblEnv -> IO ModGuts
385 hscDesugar hsc_env mod_summary tc_result
386 = runHsc hsc_env $ hscDesugar' mod_summary tc_result
388 hscDesugar' :: ModSummary -> TcGblEnv -> Hsc ModGuts
389 hscDesugar' mod_summary tc_result
393 deSugar hsc_env (ms_location mod_summary) tc_result
396 -- always check -Werror after desugaring, this is
397 -- the last opportunity for warnings to arise before
401 -- | Make a 'ModIface' from the results of typechecking. Used when
402 -- not optimising, and the interface doesn't need to contain any
403 -- unfoldings or other cross-module optimisation info.
404 -- ToDo: the old interface is only needed to get the version numbers,
405 -- we should use fingerprint versions instead.
406 makeSimpleIface :: HscEnv ->
407 Maybe ModIface -> TcGblEnv -> ModDetails
408 -> IO (ModIface,Bool)
409 makeSimpleIface hsc_env maybe_old_iface tc_result details
412 mkIfaceTc hsc_env (fmap mi_iface_hash maybe_old_iface) details tc_result
414 -- | Make a 'ModDetails' from the results of typechecking. Used when
415 -- typechecking only, as opposed to full compilation.
416 makeSimpleDetails :: HscEnv -> TcGblEnv -> IO ModDetails
417 makeSimpleDetails hsc_env tc_result = mkBootModDetailsTc hsc_env tc_result
420 %************************************************************************
422 The main compiler pipeline
424 %************************************************************************
426 --------------------------------
427 The compilation proper
428 --------------------------------
431 It's the task of the compilation proper to compile Haskell, hs-boot and
432 core files to either byte-code, hard-code (C, asm, Java, ect) or to
433 nothing at all (the module is still parsed and type-checked. This
434 feature is mostly used by IDE's and the likes).
435 Compilation can happen in either 'one-shot', 'batch', 'nothing',
436 or 'interactive' mode. 'One-shot' mode targets hard-code, 'batch' mode
437 targets hard-code, 'nothing' mode targets nothing and 'interactive' mode
439 The modes are kept separate because of their different types and meanings.
440 In 'one-shot' mode, we're only compiling a single file and can therefore
441 discard the new ModIface and ModDetails. This is also the reason it only
442 targets hard-code; compiling to byte-code or nothing doesn't make sense
443 when we discard the result.
444 'Batch' mode is like 'one-shot' except that we keep the resulting ModIface
445 and ModDetails. 'Batch' mode doesn't target byte-code since that require
446 us to return the newly compiled byte-code.
447 'Nothing' mode has exactly the same type as 'batch' mode but they're still
448 kept separate. This is because compiling to nothing is fairly special: We
449 don't output any interface files, we don't run the simplifier and we don't
451 'Interactive' mode is similar to 'batch' mode except that we return the
452 compiled byte-code together with the ModIface and ModDetails.
454 Trying to compile a hs-boot file to byte-code will result in a run-time
455 error. This is the only thing that isn't caught by the type-system.
459 -- Status of a compilation to hard-code or nothing.
464 -- Has stub files. This is a hack. We can't compile C files here
465 -- since it's done in DriverPipeline. For now we just return True
466 -- if we want the caller to compile them for us.
469 -- This is a bit ugly. Since we use a typeclass below and would like to avoid
470 -- functional dependencies, we have to parameterise the typeclass over the
471 -- result type. Therefore we need to artificially distinguish some types. We
472 -- do this by adding type tags which will simply be ignored by the caller.
473 type HscStatus = HscStatus' ()
474 type InteractiveStatus = HscStatus' (Maybe (CompiledByteCode, ModBreaks))
475 -- INVARIANT: result is @Nothing@ <=> input was a boot file
477 type OneShotResult = HscStatus
478 type BatchResult = (HscStatus, ModIface, ModDetails)
479 type NothingResult = (HscStatus, ModIface, ModDetails)
480 type InteractiveResult = (InteractiveStatus, ModIface, ModDetails)
482 -- FIXME: The old interface and module index are only using in 'batch' and
483 -- 'interactive' mode. They should be removed from 'oneshot' mode.
484 type Compiler result = HscEnv
486 -> Bool -- True <=> source unchanged
487 -> Maybe ModIface -- Old interface, if available
488 -> Maybe (Int,Int) -- Just (i,n) <=> module i of n (for msgs)
493 -- | Called when no recompilation is necessary.
494 hscNoRecomp :: ModIface
497 -- | Called to recompile the module.
498 hscRecompile :: ModSummary -> Maybe Fingerprint
501 hscBackend :: TcGblEnv -> ModSummary -> Maybe Fingerprint
504 -- | Code generation for Boot modules.
505 hscGenBootOutput :: TcGblEnv -> ModSummary -> Maybe Fingerprint
508 -- | Code generation for normal modules.
509 hscGenOutput :: ModGuts -> ModSummary -> Maybe Fingerprint
513 genericHscCompile :: HsCompiler a
514 -> (HscEnv -> Maybe (Int,Int) -> Bool -> ModSummary -> IO ())
515 -> HscEnv -> ModSummary -> Bool
516 -> Maybe ModIface -> Maybe (Int, Int)
518 genericHscCompile compiler hscMessage hsc_env
519 mod_summary source_unchanged
520 mb_old_iface0 mb_mod_index
522 (recomp_reqd, mb_checked_iface)
523 <- {-# SCC "checkOldIface" #-}
524 checkOldIface hsc_env mod_summary
525 source_unchanged mb_old_iface0
526 -- save the interface that comes back from checkOldIface.
527 -- In one-shot mode we don't have the old iface until this
528 -- point, when checkOldIface reads it from the disk.
529 let mb_old_hash = fmap mi_iface_hash mb_checked_iface
530 case mb_checked_iface of
531 Just iface | not recomp_reqd
532 -> do hscMessage hsc_env mb_mod_index False mod_summary
533 runHsc hsc_env $ hscNoRecomp compiler iface
535 -> do hscMessage hsc_env mb_mod_index True mod_summary
536 runHsc hsc_env $ hscRecompile compiler mod_summary mb_old_hash
538 hscCheckRecompBackend :: HsCompiler a -> TcGblEnv -> Compiler a
539 hscCheckRecompBackend compiler tc_result
540 hsc_env mod_summary source_unchanged mb_old_iface _m_of_n
542 (recomp_reqd, mb_checked_iface)
543 <- {-# SCC "checkOldIface" #-}
544 checkOldIface hsc_env mod_summary
545 source_unchanged mb_old_iface
547 let mb_old_hash = fmap mi_iface_hash mb_checked_iface
548 case mb_checked_iface of
549 Just iface | not recomp_reqd
552 iface{ mi_globals = Just (tcg_rdr_env tc_result) }
555 hscBackend compiler tc_result mod_summary mb_old_hash
557 genericHscRecompile :: HsCompiler a
558 -> ModSummary -> Maybe Fingerprint
560 genericHscRecompile compiler mod_summary mb_old_hash
561 | ExtCoreFile <- ms_hsc_src mod_summary =
562 panic "GHC does not currently support reading External Core files"
564 tc_result <- hscFileFrontEnd mod_summary
565 hscBackend compiler tc_result mod_summary mb_old_hash
567 genericHscBackend :: HsCompiler a
568 -> TcGblEnv -> ModSummary -> Maybe Fingerprint
570 genericHscBackend compiler tc_result mod_summary mb_old_hash
571 | HsBootFile <- ms_hsc_src mod_summary =
572 hscGenBootOutput compiler tc_result mod_summary mb_old_hash
574 guts <- hscDesugar' mod_summary tc_result
575 hscGenOutput compiler guts mod_summary mb_old_hash
577 compilerBackend :: HsCompiler a -> TcGblEnv -> Compiler a
578 compilerBackend comp tcg hsc_env ms' _ _mb_old_iface _ =
580 hscBackend comp tcg ms' Nothing
582 --------------------------------------------------------------
584 --------------------------------------------------------------
586 hscOneShotCompiler :: HsCompiler OneShotResult
590 hscNoRecomp = \_old_iface -> do
592 liftIO $ dumpIfaceStats hsc_env
595 , hscRecompile = genericHscRecompile hscOneShotCompiler
597 , hscBackend = \ tc_result mod_summary mb_old_hash -> do
598 dflags <- getDynFlags
599 case hscTarget dflags of
600 HscNothing -> return (HscRecomp Nothing ())
601 _otherw -> genericHscBackend hscOneShotCompiler
602 tc_result mod_summary mb_old_hash
604 , hscGenBootOutput = \tc_result mod_summary mb_old_iface -> do
605 (iface, changed, _) <- hscSimpleIface tc_result mb_old_iface
606 hscWriteIface iface changed mod_summary
607 return (HscRecomp Nothing ())
609 , hscGenOutput = \guts0 mod_summary mb_old_iface -> do
610 guts <- hscSimplify' guts0
611 (iface, changed, _details, cgguts) <- hscNormalIface guts mb_old_iface
612 hscWriteIface iface changed mod_summary
613 hasStub <- hscGenHardCode cgguts mod_summary
614 return (HscRecomp hasStub ())
617 -- Compile Haskell, boot and extCore in OneShot mode.
618 hscCompileOneShot :: Compiler OneShotResult
619 hscCompileOneShot hsc_env mod_summary src_changed mb_old_iface mb_i_of_n
621 -- One-shot mode needs a knot-tying mutable variable for interface
622 -- files. See TcRnTypes.TcGblEnv.tcg_type_env_var.
623 type_env_var <- newIORef emptyNameEnv
625 mod = ms_mod mod_summary
626 hsc_env' = hsc_env{ hsc_type_env_var = Just (mod, type_env_var) }
628 genericHscCompile hscOneShotCompiler
629 oneShotMsg hsc_env' mod_summary src_changed
630 mb_old_iface mb_i_of_n
633 hscOneShotBackendOnly :: TcGblEnv -> Compiler OneShotResult
634 hscOneShotBackendOnly = compilerBackend hscOneShotCompiler
636 --------------------------------------------------------------
638 hscBatchCompiler :: HsCompiler BatchResult
642 hscNoRecomp = \iface -> do
643 details <- genModDetails iface
644 return (HscNoRecomp, iface, details)
646 , hscRecompile = genericHscRecompile hscBatchCompiler
648 , hscBackend = genericHscBackend hscBatchCompiler
650 , hscGenBootOutput = \tc_result mod_summary mb_old_iface -> do
651 (iface, changed, details) <- hscSimpleIface tc_result mb_old_iface
652 hscWriteIface iface changed mod_summary
653 return (HscRecomp Nothing (), iface, details)
655 , hscGenOutput = \guts0 mod_summary mb_old_iface -> do
656 guts <- hscSimplify' guts0
657 (iface, changed, details, cgguts) <- hscNormalIface guts mb_old_iface
658 hscWriteIface iface changed mod_summary
659 hasStub <- hscGenHardCode cgguts mod_summary
660 return (HscRecomp hasStub (), iface, details)
663 -- Compile Haskell, boot and extCore in batch mode.
664 hscCompileBatch :: Compiler (HscStatus, ModIface, ModDetails)
665 hscCompileBatch = genericHscCompile hscBatchCompiler batchMsg
667 hscBatchBackendOnly :: TcGblEnv -> Compiler BatchResult
668 hscBatchBackendOnly = hscCheckRecompBackend hscBatchCompiler
670 --------------------------------------------------------------
672 hscInteractiveCompiler :: HsCompiler InteractiveResult
673 hscInteractiveCompiler =
675 hscNoRecomp = \iface -> do
676 details <- genModDetails iface
677 return (HscNoRecomp, iface, details)
679 , hscRecompile = genericHscRecompile hscInteractiveCompiler
681 , hscBackend = genericHscBackend hscInteractiveCompiler
683 , hscGenBootOutput = \tc_result _mod_summary mb_old_iface -> do
684 (iface, _changed, details) <- hscSimpleIface tc_result mb_old_iface
685 return (HscRecomp Nothing Nothing, iface, details)
687 , hscGenOutput = \guts0 mod_summary mb_old_iface -> do
688 guts <- hscSimplify' guts0
689 (iface, _changed, details, cgguts) <- hscNormalIface guts mb_old_iface
690 hscInteractive (iface, details, cgguts) mod_summary
693 -- Compile Haskell, extCore to bytecode.
694 hscCompileInteractive :: Compiler (InteractiveStatus, ModIface, ModDetails)
695 hscCompileInteractive = genericHscCompile hscInteractiveCompiler batchMsg
697 hscInteractiveBackendOnly :: TcGblEnv -> Compiler InteractiveResult
698 hscInteractiveBackendOnly = compilerBackend hscInteractiveCompiler
700 --------------------------------------------------------------
702 hscNothingCompiler :: HsCompiler NothingResult
705 hscNoRecomp = \iface -> do
706 details <- genModDetails iface
707 return (HscNoRecomp, iface, details)
709 , hscRecompile = genericHscRecompile hscNothingCompiler
711 , hscBackend = \tc_result _mod_summary mb_old_iface -> do
713 (iface, _changed, details) <- hscSimpleIface tc_result mb_old_iface
714 return (HscRecomp Nothing (), iface, details)
716 , hscGenBootOutput = \_ _ _ ->
717 panic "hscCompileNothing: hscGenBootOutput should not be called"
719 , hscGenOutput = \_ _ _ ->
720 panic "hscCompileNothing: hscGenOutput should not be called"
723 -- Type-check Haskell and .hs-boot only (no external core)
724 hscCompileNothing :: Compiler (HscStatus, ModIface, ModDetails)
725 hscCompileNothing = genericHscCompile hscNothingCompiler batchMsg
727 hscNothingBackendOnly :: TcGblEnv -> Compiler NothingResult
728 hscNothingBackendOnly = compilerBackend hscNothingCompiler
730 --------------------------------------------------------------
732 --------------------------------------------------------------
734 genModDetails :: ModIface -> Hsc ModDetails
735 genModDetails old_iface
738 new_details <- {-# SCC "tcRnIface" #-}
739 liftIO $ initIfaceCheck hsc_env $
740 typecheckIface old_iface
741 liftIO $ dumpIfaceStats hsc_env
744 --------------------------------------------------------------
745 -- Progress displayers.
746 --------------------------------------------------------------
748 oneShotMsg :: HscEnv -> Maybe (Int,Int) -> Bool -> ModSummary -> IO ()
749 oneShotMsg hsc_env _mb_mod_index recomp _mod_summary =
752 else compilationProgressMsg (hsc_dflags hsc_env) $
753 "compilation IS NOT required"
755 batchMsg :: HscEnv -> Maybe (Int,Int) -> Bool -> ModSummary -> IO ()
756 batchMsg hsc_env mb_mod_index recomp mod_summary
758 let showMsg msg = compilationProgressMsg (hsc_dflags hsc_env) $
759 (showModuleIndex mb_mod_index ++
760 msg ++ showModMsg (hscTarget (hsc_dflags hsc_env)) recomp mod_summary)
762 then showMsg "Compiling "
763 else if verbosity (hsc_dflags hsc_env) >= 2
764 then showMsg "Skipping "
767 --------------------------------------------------------------
769 --------------------------------------------------------------
771 hscFileFrontEnd :: ModSummary -> Hsc TcGblEnv
772 hscFileFrontEnd mod_summary =
773 do rdr_module <- hscParse' mod_summary
775 {-# SCC "Typecheck-Rename" #-}
777 tcRnModule hsc_env (ms_hsc_src mod_summary) False rdr_module
779 --------------------------------------------------------------
781 --------------------------------------------------------------
783 hscSimplify :: HscEnv -> ModGuts -> IO ModGuts
784 hscSimplify hsc_env modguts = runHsc hsc_env $ hscSimplify' modguts
786 hscSimplify' :: ModGuts -> Hsc ModGuts
787 hscSimplify' ds_result
788 = do hsc_env <- getHscEnv
789 {-# SCC "Core2Core" #-}
790 liftIO $ core2core hsc_env ds_result
792 --------------------------------------------------------------
793 -- Interface generators
794 --------------------------------------------------------------
796 hscSimpleIface :: TcGblEnv
798 -> Hsc (ModIface, Bool, ModDetails)
799 hscSimpleIface tc_result mb_old_iface
802 details <- liftIO $ mkBootModDetailsTc hsc_env tc_result
803 (new_iface, no_change)
804 <- {-# SCC "MkFinalIface" #-}
806 mkIfaceTc hsc_env mb_old_iface details tc_result
807 -- And the answer is ...
808 liftIO $ dumpIfaceStats hsc_env
809 return (new_iface, no_change, details)
811 hscNormalIface :: ModGuts
813 -> Hsc (ModIface, Bool, ModDetails, CgGuts)
814 hscNormalIface simpl_result mb_old_iface
817 (cg_guts, details) <- {-# SCC "CoreTidy" #-}
818 liftIO $ tidyProgram hsc_env simpl_result
820 -- BUILD THE NEW ModIface and ModDetails
821 -- and emit external core if necessary
822 -- This has to happen *after* code gen so that the back-end
823 -- info has been set. Not yet clear if it matters waiting
824 -- until after code output
825 (new_iface, no_change)
826 <- {-# SCC "MkFinalIface" #-}
828 mkIface hsc_env mb_old_iface details simpl_result
830 -- Emit external core
831 -- This should definitely be here and not after CorePrep,
832 -- because CorePrep produces unqualified constructor wrapper declarations,
833 -- so its output isn't valid External Core (without some preprocessing).
834 liftIO $ emitExternalCore (hsc_dflags hsc_env) cg_guts
835 liftIO $ dumpIfaceStats hsc_env
837 -- Return the prepared code.
838 return (new_iface, no_change, details, cg_guts)
840 --------------------------------------------------------------
841 -- BackEnd combinators
842 --------------------------------------------------------------
844 hscWriteIface :: ModIface
849 hscWriteIface iface no_change mod_summary
850 = do dflags <- getDynFlags
852 $ liftIO $ writeIfaceFile dflags (ms_location mod_summary) iface
854 -- | Compile to hard-code.
855 hscGenHardCode :: CgGuts -> ModSummary
856 -> Hsc (Maybe FilePath) -- ^ @Just f@ <=> _stub.c is f
857 hscGenHardCode cgguts mod_summary
861 let CgGuts{ -- This is the last use of the ModGuts in a compilation.
862 -- From now on, we just use the bits we need.
863 cg_module = this_mod,
864 cg_binds = core_binds,
866 cg_dir_imps = dir_imps,
867 cg_foreign = foreign_stubs,
868 cg_dep_pkgs = dependencies,
869 cg_hpc_info = hpc_info } = cgguts
870 dflags = hsc_dflags hsc_env
871 location = ms_location mod_summary
872 data_tycons = filter isDataTyCon tycons
873 -- cg_tycons includes newtypes, for the benefit of External Core,
874 -- but we don't generate any code for newtypes
877 -- PREPARE FOR CODE GENERATION
878 -- Do saturation and convert to A-normal form
879 prepd_binds <- {-# SCC "CorePrep" #-}
880 corePrepPgm dflags core_binds data_tycons ;
881 ----------------- Convert to STG ------------------
882 (stg_binds, cost_centre_info)
883 <- {-# SCC "CoreToStg" #-}
884 myCoreToStg dflags this_mod prepd_binds
886 ------------------ Code generation ------------------
888 cmms <- if dopt Opt_TryNewCodeGen dflags
889 then do cmms <- tryNewCodeGen hsc_env this_mod data_tycons
890 dir_imps cost_centre_info
893 else {-# SCC "CodeGen" #-}
894 codeGen dflags this_mod data_tycons
895 dir_imps cost_centre_info
898 --- Optionally run experimental Cmm transformations ---
899 cmms <- optionallyConvertAndOrCPS hsc_env cmms
900 -- unless certain dflags are on, the identity function
901 ------------------ Code output -----------------------
902 rawcmms <- cmmToRawCmm cmms
903 dumpIfSet_dyn dflags Opt_D_dump_raw_cmm "Raw Cmm" (ppr rawcmms)
904 (_stub_h_exists, stub_c_exists)
905 <- codeOutput dflags this_mod location foreign_stubs
909 hscInteractive :: (ModIface, ModDetails, CgGuts)
911 -> Hsc (InteractiveStatus, ModIface, ModDetails)
913 hscInteractive (iface, details, cgguts) mod_summary
915 dflags <- getDynFlags
916 let CgGuts{ -- This is the last use of the ModGuts in a compilation.
917 -- From now on, we just use the bits we need.
918 cg_module = this_mod,
919 cg_binds = core_binds,
921 cg_foreign = foreign_stubs,
922 cg_modBreaks = mod_breaks } = cgguts
924 location = ms_location mod_summary
925 data_tycons = filter isDataTyCon tycons
926 -- cg_tycons includes newtypes, for the benefit of External Core,
927 -- but we don't generate any code for newtypes
930 -- PREPARE FOR CODE GENERATION
931 -- Do saturation and convert to A-normal form
932 prepd_binds <- {-# SCC "CorePrep" #-}
933 liftIO $ corePrepPgm dflags core_binds data_tycons ;
934 ----------------- Generate byte code ------------------
935 comp_bc <- liftIO $ byteCodeGen dflags prepd_binds data_tycons mod_breaks
936 ------------------ Create f-x-dynamic C-side stuff ---
937 (_istub_h_exists, istub_c_exists)
938 <- liftIO $ outputForeignStubs dflags this_mod
939 location foreign_stubs
940 return (HscRecomp istub_c_exists (Just (comp_bc, mod_breaks))
943 hscInteractive _ _ = panic "GHC not compiled with interpreter"
946 ------------------------------
948 hscCompileCmmFile :: HscEnv -> FilePath -> IO ()
949 hscCompileCmmFile hsc_env filename
950 = runHsc hsc_env $ do
951 let dflags = hsc_dflags hsc_env
952 cmm <- ioMsgMaybe $ parseCmmFile dflags filename
954 cmms <- optionallyConvertAndOrCPS hsc_env [cmm]
955 rawCmms <- cmmToRawCmm cmms
956 _ <- codeOutput dflags no_mod no_loc NoStubs [] rawCmms
959 no_mod = panic "hscCmmFile: no_mod"
960 no_loc = ModLocation{ ml_hs_file = Just filename,
961 ml_hi_file = panic "hscCmmFile: no hi file",
962 ml_obj_file = panic "hscCmmFile: no obj file" }
964 -------------------- Stuff for new code gen ---------------------
966 tryNewCodeGen :: HscEnv -> Module -> [TyCon] -> [Module]
968 -> [(StgBinding,[(Id,[Id])])]
971 tryNewCodeGen hsc_env this_mod data_tycons imported_mods
972 cost_centre_info stg_binds hpc_info =
973 do { let dflags = hsc_dflags hsc_env
974 ; prog <- StgCmm.codeGen dflags this_mod data_tycons imported_mods
975 cost_centre_info stg_binds hpc_info
976 ; dumpIfSet_dyn dflags Opt_D_dump_cmmz "Cmm produced by new codegen"
979 ; prog <- return $ map runCmmContFlowOpts prog
980 -- Control flow optimisation
982 -- We are building a single SRT for the entire module, so
983 -- we must thread it through all the procedures as we cps-convert them.
984 ; us <- mkSplitUniqSupply 'S'
985 ; let topSRT = initUs_ us emptySRT
986 ; (topSRT, prog) <- foldM (protoCmmCPS hsc_env) (topSRT, []) prog
987 -- The main CPS conversion
989 ; prog <- return $ map runCmmContFlowOpts (srtToData topSRT : prog)
990 -- Control flow optimisation, again
992 ; let prog' = map cmmOfZgraph prog
993 ; dumpIfSet_dyn dflags Opt_D_dump_cmmz "Output Cmm" (ppr prog')
997 optionallyConvertAndOrCPS :: HscEnv -> [Cmm] -> IO [Cmm]
998 optionallyConvertAndOrCPS hsc_env cmms =
999 do let dflags = hsc_dflags hsc_env
1000 -------- Optionally convert to and from zipper ------
1001 cmms <- if dopt Opt_ConvertToZipCfgAndBack dflags
1002 then mapM (testCmmConversion hsc_env) cmms
1007 testCmmConversion :: HscEnv -> Cmm -> IO Cmm
1008 testCmmConversion hsc_env cmm =
1009 do let dflags = hsc_dflags hsc_env
1010 showPass dflags "CmmToCmm"
1011 dumpIfSet_dyn dflags Opt_D_dump_cvt_cmm "C-- pre-conversion" (ppr cmm)
1012 --continuationC <- cmmCPS dflags abstractC >>= cmmToRawCmm
1013 us <- mkSplitUniqSupply 'C'
1014 let cvtm = runCmmContFlowOpts `liftM` cmmToZgraph cmm
1015 let zgraph = initUs_ us cvtm
1016 us <- mkSplitUniqSupply 'S'
1017 let topSRT = initUs_ us emptySRT
1018 (_, [cps_zgraph]) <- protoCmmCPS hsc_env (topSRT, []) zgraph
1019 let chosen_graph = if dopt Opt_RunCPSZ dflags then cps_zgraph else zgraph
1020 dumpIfSet_dyn dflags Opt_D_dump_cmmz "C-- Zipper Graph" (ppr chosen_graph)
1021 showPass dflags "Convert from Z back to Cmm"
1022 let cvt = cmmOfZgraph $ runCmmContFlowOpts $ chosen_graph
1023 dumpIfSet_dyn dflags Opt_D_dump_cvt_cmm "C-- post-conversion" (ppr cvt)
1026 myCoreToStg :: DynFlags -> Module -> [CoreBind]
1027 -> IO ( [(StgBinding,[(Id,[Id])])] -- output program
1028 , CollectedCCs) -- cost centre info (declared and used)
1030 myCoreToStg dflags this_mod prepd_binds
1032 stg_binds <- {-# SCC "Core2Stg" #-}
1033 coreToStg (thisPackage dflags) prepd_binds
1035 (stg_binds2, cost_centre_info) <- {-# SCC "Stg2Stg" #-}
1036 stg2stg dflags this_mod stg_binds
1038 return (stg_binds2, cost_centre_info)
1042 %************************************************************************
1044 \subsection{Compiling a do-statement}
1046 %************************************************************************
1048 When the UnlinkedBCOExpr is linked you get an HValue of type
1050 When you run it you get a list of HValues that should be
1051 the same length as the list of names; add them to the ClosureEnv.
1053 A naked expression returns a singleton Name [it].
1055 What you type The IO [HValue] that hscStmt returns
1056 ------------- ------------------------------------
1057 let pat = expr ==> let pat = expr in return [coerce HVal x, coerce HVal y, ...]
1060 pat <- expr ==> expr >>= \ pat -> return [coerce HVal x, coerce HVal y, ...]
1063 expr (of IO type) ==> expr >>= \ v -> return [v]
1064 [NB: result not printed] bindings: [it]
1067 expr (of non-IO type,
1068 result showable) ==> let v = expr in print v >> return [v]
1071 expr (of non-IO type,
1072 result not showable) ==> error
1076 hscStmt -- Compile a stmt all the way to an HValue, but don't run it
1078 -> String -- The statement
1079 -> IO (Maybe ([Id], HValue))
1080 -- ^ 'Nothing' <==> empty statement (or comment only), but no parse error
1081 hscStmt hsc_env stmt = hscStmtWithLocation hsc_env stmt "<interactive>" 1
1083 hscStmtWithLocation -- Compile a stmt all the way to an HValue, but don't run it
1085 -> String -- The statement
1086 -> String -- the source
1087 -> Int -- ^ starting line
1088 -> IO (Maybe ([Id], HValue))
1089 -- ^ 'Nothing' <==> empty statement (or comment only), but no parse error
1090 hscStmtWithLocation hsc_env stmt source linenumber = runHsc hsc_env $ do
1091 maybe_stmt <- hscParseStmtWithLocation source linenumber stmt
1093 Nothing -> return Nothing
1094 Just parsed_stmt -> do -- The real stuff
1096 -- Rename and typecheck it
1097 let icontext = hsc_IC hsc_env
1098 (ids, tc_expr) <- ioMsgMaybe $
1099 tcRnStmt hsc_env icontext parsed_stmt
1101 let rdr_env = ic_rn_gbl_env icontext
1102 type_env = mkTypeEnv (map AnId (ic_tmp_ids icontext))
1103 ds_expr <- ioMsgMaybe $
1104 deSugarExpr hsc_env iNTERACTIVE rdr_env type_env tc_expr
1107 -- Then desugar, code gen, and link it
1108 let src_span = srcLocSpan interactiveSrcLoc
1109 hsc_env <- getHscEnv
1110 hval <- liftIO $ hscCompileCoreExpr hsc_env src_span ds_expr
1112 return $ Just (ids, hval)
1114 hscImport :: HscEnv -> String -> IO (ImportDecl RdrName)
1115 hscImport hsc_env str = runHsc hsc_env $ do
1116 (L _ (HsModule{hsmodImports=is})) <-
1117 hscParseThing parseModule str
1119 [i] -> return (unLoc i)
1120 _ -> liftIO $ throwOneError $
1121 mkPlainErrMsg noSrcSpan $
1122 ptext (sLit "parse error in import declaration")
1124 hscTcExpr -- Typecheck an expression (but don't run it)
1126 -> String -- The expression
1129 hscTcExpr hsc_env expr = runHsc hsc_env $ do
1130 maybe_stmt <- hscParseStmt expr
1132 Just (L _ (ExprStmt expr _ _)) ->
1133 ioMsgMaybe $ tcRnExpr hsc_env (hsc_IC hsc_env) expr
1135 liftIO $ throwIO $ mkSrcErr $ unitBag $
1136 mkPlainErrMsg noSrcSpan
1137 (text "not an expression:" <+> quotes (text expr))
1139 -- | Find the kind of a type
1142 -> String -- ^ The type
1145 hscKcType hsc_env str = runHsc hsc_env $ do
1146 ty <- hscParseType str
1147 ioMsgMaybe $ tcRnType hsc_env (hsc_IC hsc_env) ty
1154 hscParseStmt :: String -> Hsc (Maybe (LStmt RdrName))
1155 hscParseStmt = hscParseThing parseStmt
1157 hscParseStmtWithLocation :: String -> Int
1158 -> String -> Hsc (Maybe (LStmt RdrName))
1159 hscParseStmtWithLocation source linenumber stmt =
1160 hscParseThingWithLocation source linenumber parseStmt stmt
1162 hscParseType :: String -> Hsc (LHsType RdrName)
1163 hscParseType = hscParseThing parseType
1166 hscParseIdentifier :: HscEnv -> String -> IO (Located RdrName)
1167 hscParseIdentifier hsc_env str = runHsc hsc_env $
1168 hscParseThing parseIdentifier str
1170 hscParseThing :: (Outputable thing)
1174 hscParseThing = hscParseThingWithLocation "<interactive>" 1
1176 hscParseThingWithLocation :: (Outputable thing)
1181 hscParseThingWithLocation source linenumber parser str
1182 = {-# SCC "Parser" #-} do
1183 dflags <- getDynFlags
1184 liftIO $ showPass dflags "Parser"
1186 let buf = stringToStringBuffer str
1187 loc = mkSrcLoc (fsLit source) linenumber 1
1189 case unP parser (mkPState dflags buf loc) of
1191 PFailed span err -> do
1192 let msg = mkPlainErrMsg span err
1193 liftIO $ throwIO (mkSrcErr (unitBag msg))
1196 logWarningsReportErrors (getMessages pst)
1197 liftIO $ dumpIfSet_dyn dflags Opt_D_dump_parsed "Parser" (ppr thing)
1202 hscCompileCore :: HscEnv
1208 hscCompileCore hsc_env simplify mod_summary binds
1209 = runHsc hsc_env $ do
1210 let maybe_simplify mod_guts | simplify = hscSimplify' mod_guts
1211 | otherwise = return mod_guts
1212 guts <- maybe_simplify (mkModGuts (ms_mod mod_summary) binds)
1213 (iface, changed, _details, cgguts) <- hscNormalIface guts Nothing
1214 hscWriteIface iface changed mod_summary
1215 _ <- hscGenHardCode cgguts mod_summary
1218 -- Makes a "vanilla" ModGuts.
1219 mkModGuts :: Module -> [CoreBind] -> ModGuts
1220 mkModGuts mod binds = ModGuts {
1224 mg_deps = noDependencies,
1225 mg_dir_imps = emptyModuleEnv,
1226 mg_used_names = emptyNameSet,
1227 mg_rdr_env = emptyGlobalRdrEnv,
1228 mg_fix_env = emptyFixityEnv,
1229 mg_types = emptyTypeEnv,
1235 mg_foreign = NoStubs,
1236 mg_warns = NoWarnings,
1238 mg_hpc_info = emptyHpcInfo False,
1239 mg_modBreaks = emptyModBreaks,
1240 mg_vect_info = noVectInfo,
1241 mg_inst_env = emptyInstEnv,
1242 mg_fam_inst_env = emptyFamInstEnv
1246 %************************************************************************
1248 Desugar, simplify, convert to bytecode, and link an expression
1250 %************************************************************************
1254 hscCompileCoreExpr :: HscEnv -> SrcSpan -> CoreExpr -> IO HValue
1255 hscCompileCoreExpr hsc_env srcspan ds_expr
1257 = throwIO (InstallationError "You can't call hscCompileCoreExpr in a profiled compiler")
1258 -- Otherwise you get a seg-fault when you run it
1261 let dflags = hsc_dflags hsc_env
1262 let lint_on = dopt Opt_DoCoreLinting dflags
1265 simpl_expr <- simplifyExpr dflags ds_expr
1267 -- Tidy it (temporary, until coreSat does cloning)
1268 let tidy_expr = tidyExpr emptyTidyEnv simpl_expr
1270 -- Prepare for codegen
1271 prepd_expr <- corePrepExpr dflags tidy_expr
1273 -- Lint if necessary
1274 -- ToDo: improve SrcLoc
1276 let ictxt = hsc_IC hsc_env
1277 tyvars = varSetElems (tyVarsOfTypes (map idType (ic_tmp_ids ictxt)))
1279 case lintUnfolding noSrcLoc tyvars prepd_expr of
1280 Just err -> pprPanic "hscCompileCoreExpr" err
1281 Nothing -> return ()
1284 bcos <- coreExprToBCOs dflags prepd_expr
1287 hval <- linkExpr hsc_env srcspan bcos
1294 %************************************************************************
1296 Statistics on reading interfaces
1298 %************************************************************************
1301 dumpIfaceStats :: HscEnv -> IO ()
1302 dumpIfaceStats hsc_env
1303 = do { eps <- readIORef (hsc_EPS hsc_env)
1304 ; dumpIfSet (dump_if_trace || dump_rn_stats)
1305 "Interface statistics"
1308 dflags = hsc_dflags hsc_env
1309 dump_rn_stats = dopt Opt_D_dump_rn_stats dflags
1310 dump_if_trace = dopt Opt_D_dump_if_trace dflags
1313 %************************************************************************
1315 Progress Messages: Module i of n
1317 %************************************************************************
1320 showModuleIndex :: Maybe (Int, Int) -> String
1321 showModuleIndex Nothing = ""
1322 showModuleIndex (Just (i,n)) = "[" ++ padded ++ " of " ++ n_str ++ "] "
1326 padded = replicate (length n_str - length i_str) ' ' ++ i_str