2 % (c) The GRASP/AQUA Project, Glasgow University, 1993-2000
5 -- | Main driver for the compiling plain Haskell source code.
7 -- This module implements compilation of a Haskell-only source file. It is
8 -- /not/ concerned with preprocessing of source files; this is handled in
12 ( newHscEnv, hscCmmFile
15 , hscNormalIface, hscWriteIface, hscGenHardCode
17 , hscStmt, hscTcExpr, hscKcType
21 , hscOneShotCompiler, hscNothingCompiler
22 , hscInteractiveCompiler, hscBatchCompiler
23 , hscCompileOneShot -- :: Compiler HscStatus
24 , hscCompileBatch -- :: Compiler (HscStatus, ModIface, ModDetails)
25 , hscCompileNothing -- :: Compiler (HscStatus, ModIface, ModDetails)
26 , hscCompileInteractive -- :: Compiler (InteractiveStatus, ModIface, ModDetails)
28 , InteractiveStatus, HscStatus
40 import CodeOutput ( outputForeignStubs )
41 import ByteCodeGen ( byteCodeGen, coreExprToBCOs )
42 import Linker ( HValue, linkExpr )
43 import CoreTidy ( tidyExpr )
44 import CorePrep ( corePrepExpr )
45 import Desugar ( deSugarExpr )
46 import SimplCore ( simplifyExpr )
47 import TcRnDriver ( tcRnStmt, tcRnExpr, tcRnType )
49 import PrelNames ( iNTERACTIVE )
50 import {- Kind parts of -} Type ( Kind )
51 import CoreLint ( lintUnfolding )
52 import DsMeta ( templateHaskellNames )
53 import SrcLoc ( SrcSpan, noSrcLoc, interactiveSrcLoc, srcLocSpan, noSrcSpan )
55 import VarEnv ( emptyTidyEnv )
59 import Module ( emptyModuleEnv, ModLocation(..), Module )
63 import SrcLoc ( Located(..) )
67 import SrcLoc ( mkSrcLoc )
68 import TcRnDriver ( tcRnModule )
69 import TcIface ( typecheckIface )
70 import TcRnMonad ( initIfaceCheck, TcGblEnv(..) )
71 import IfaceEnv ( initNameCache )
72 import LoadIface ( ifaceStats, initExternalPackageState )
73 import PrelInfo ( wiredInThings, basicKnownKeyNames )
75 import Desugar ( deSugar )
76 import SimplCore ( core2core )
78 import CorePrep ( corePrepPgm )
79 import CoreToStg ( coreToStg )
80 import qualified StgCmm ( codeGen )
83 import TyCon ( TyCon, isDataTyCon )
84 import Name ( Name, NamedThing(..) )
85 import SimplStg ( stg2stg )
86 import CodeGen ( codeGen )
88 import PprCmm ( pprCmms )
89 import CmmParse ( parseCmmFile )
90 import CmmBuildInfoTables
94 import OptimizationFuel ( initOptFuelState )
98 import CodeOutput ( codeOutput )
99 import NameEnv ( emptyNameEnv )
100 import Fingerprint ( Fingerprint )
104 import UniqSupply ( mkSplitUniqSupply )
107 import HscStats ( ppSourceStats )
109 import MkExternalCore ( emitExternalCore )
111 import LazyUniqFM ( emptyUFM )
112 import UniqSupply ( initUs_ )
113 import Bag ( unitBag )
121 #include "HsVersions.h"
124 %************************************************************************
128 %************************************************************************
131 newHscEnv :: GhcApiCallbacks -> DynFlags -> IO HscEnv
132 newHscEnv callbacks dflags
133 = do { eps_var <- newIORef initExternalPackageState
134 ; us <- mkSplitUniqSupply 'r'
135 ; nc_var <- newIORef (initNameCache us knownKeyNames)
136 ; fc_var <- newIORef emptyUFM
137 ; mlc_var <- newIORef emptyModuleEnv
138 ; optFuel <- initOptFuelState
139 ; return (HscEnv { hsc_dflags = dflags,
140 hsc_callbacks = callbacks,
143 hsc_IC = emptyInteractiveContext,
144 hsc_HPT = emptyHomePackageTable,
149 hsc_OptFuel = optFuel,
150 hsc_type_env_var = Nothing,
151 hsc_global_rdr_env = emptyGlobalRdrEnv,
152 hsc_global_type_env = emptyNameEnv } ) }
155 knownKeyNames :: [Name] -- Put here to avoid loops involving DsMeta,
156 -- where templateHaskellNames are defined
157 knownKeyNames = map getName wiredInThings
158 ++ basicKnownKeyNames
160 ++ templateHaskellNames
166 -- | parse a file, returning the abstract syntax
167 hscParse :: GhcMonad m =>
169 -> m (Located (HsModule RdrName))
170 hscParse mod_summary = do
171 hsc_env <- getSession
172 let dflags = hsc_dflags hsc_env
173 src_filename = ms_hspp_file mod_summary
174 maybe_src_buf = ms_hspp_buf mod_summary
175 -------------------------- Parser ----------------
176 liftIO $ showPass dflags "Parser"
177 {-# SCC "Parser" #-} do
179 -- sometimes we already have the buffer in memory, perhaps
180 -- because we needed to parse the imports out of it, or get the
182 buf <- case maybe_src_buf of
184 Nothing -> liftIO $ hGetStringBuffer src_filename
186 let loc = mkSrcLoc (mkFastString src_filename) 1 0
188 case unP parseModule (mkPState buf loc dflags) of
190 throwOneError (mkPlainErrMsg span err)
192 POk pst rdr_module -> do
193 let ms@(warns,errs) = getMessages pst
195 if errorsFound dflags ms then
196 liftIO $ throwIO $ mkSrcErr errs
198 dumpIfSet_dyn dflags Opt_D_dump_parsed "Parser" (ppr rdr_module) ;
199 dumpIfSet_dyn dflags Opt_D_source_stats "Source Statistics"
200 (ppSourceStats False rdr_module) ;
202 -- ToDo: free the string buffer later.
204 -- | Rename and typecheck a module
205 hscTypecheck :: GhcMonad m =>
206 ModSummary -> Located (HsModule RdrName)
208 hscTypecheck mod_summary rdr_module = do
209 hsc_env <- getSession
210 r <- {-# SCC "Typecheck-Rename" #-}
211 ioMsgMaybe $ tcRnModule hsc_env (ms_hsc_src mod_summary) False rdr_module
214 -- XXX: should this really be a Maybe X? Check under which circumstances this
215 -- can become a Nothing and decide whether this should instead throw an
216 -- exception/signal an error.
218 (Maybe (HsGroup Name, [LImportDecl Name], Maybe [LIE Name],
219 Maybe (HsDoc Name), HaddockModInfo Name))
221 -- | Rename and typecheck a module, additionally returning the renamed syntax
222 hscTypecheckRename ::
224 ModSummary -> Located (HsModule RdrName)
225 -> m (TcGblEnv, RenamedStuff)
226 hscTypecheckRename mod_summary rdr_module = do
227 hsc_env <- getSession
229 <- {-# SCC "Typecheck-Rename" #-}
230 ioMsgMaybe $ tcRnModule hsc_env (ms_hsc_src mod_summary) True rdr_module
232 let rn_info = do decl <- tcg_rn_decls tc_result
233 imports <- tcg_rn_imports tc_result
234 let exports = tcg_rn_exports tc_result
235 let doc = tcg_doc tc_result
236 let hmi = tcg_hmi tc_result
237 return (decl,imports,exports,doc,hmi)
239 return (tc_result, rn_info)
241 -- | Convert a typechecked module to Core
242 hscDesugar :: GhcMonad m => ModSummary -> TcGblEnv -> m ModGuts
243 hscDesugar mod_summary tc_result =
244 withSession $ \hsc_env ->
245 ioMsgMaybe $ deSugar hsc_env (ms_location mod_summary) tc_result
247 -- | Make a 'ModIface' from the results of typechecking. Used when
248 -- not optimising, and the interface doesn't need to contain any
249 -- unfoldings or other cross-module optimisation info.
250 -- ToDo: the old interface is only needed to get the version numbers,
251 -- we should use fingerprint versions instead.
252 makeSimpleIface :: GhcMonad m =>
253 Maybe ModIface -> TcGblEnv -> ModDetails
255 makeSimpleIface maybe_old_iface tc_result details =
256 withSession $ \hsc_env ->
257 ioMsgMaybe $ mkIfaceTc hsc_env (fmap mi_iface_hash maybe_old_iface) details tc_result
259 -- | Make a 'ModDetails' from the results of typechecking. Used when
260 -- typechecking only, as opposed to full compilation.
261 makeSimpleDetails :: GhcMonad m => TcGblEnv -> m ModDetails
262 makeSimpleDetails tc_result =
263 withSession $ \hsc_env -> liftIO $ mkBootModDetailsTc hsc_env tc_result
266 %************************************************************************
268 The main compiler pipeline
270 %************************************************************************
272 --------------------------------
273 The compilation proper
274 --------------------------------
277 It's the task of the compilation proper to compile Haskell, hs-boot and
278 core files to either byte-code, hard-code (C, asm, Java, ect) or to
279 nothing at all (the module is still parsed and type-checked. This
280 feature is mostly used by IDE's and the likes).
281 Compilation can happen in either 'one-shot', 'batch', 'nothing',
282 or 'interactive' mode. 'One-shot' mode targets hard-code, 'batch' mode
283 targets hard-code, 'nothing' mode targets nothing and 'interactive' mode
285 The modes are kept separate because of their different types and meanings.
286 In 'one-shot' mode, we're only compiling a single file and can therefore
287 discard the new ModIface and ModDetails. This is also the reason it only
288 targets hard-code; compiling to byte-code or nothing doesn't make sense
289 when we discard the result.
290 'Batch' mode is like 'one-shot' except that we keep the resulting ModIface
291 and ModDetails. 'Batch' mode doesn't target byte-code since that require
292 us to return the newly compiled byte-code.
293 'Nothing' mode has exactly the same type as 'batch' mode but they're still
294 kept separate. This is because compiling to nothing is fairly special: We
295 don't output any interface files, we don't run the simplifier and we don't
297 'Interactive' mode is similar to 'batch' mode except that we return the
298 compiled byte-code together with the ModIface and ModDetails.
300 Trying to compile a hs-boot file to byte-code will result in a run-time
301 error. This is the only thing that isn't caught by the type-system.
305 -- Status of a compilation to hard-code or nothing.
309 Bool -- Has stub files. This is a hack. We can't compile C files here
310 -- since it's done in DriverPipeline. For now we just return True
311 -- if we want the caller to compile them for us.
314 -- This is a bit ugly. Since we use a typeclass below and would like to avoid
315 -- functional dependencies, we have to parameterise the typeclass over the
316 -- result type. Therefore we need to artificially distinguish some types. We
317 -- do this by adding type tags which will simply be ignored by the caller.
318 type HscStatus = HscStatus' ()
319 type InteractiveStatus = HscStatus' (Maybe (CompiledByteCode, ModBreaks))
320 -- INVARIANT: result is @Nothing@ <=> input was a boot file
322 type OneShotResult = HscStatus
323 type BatchResult = (HscStatus, ModIface, ModDetails)
324 type NothingResult = (HscStatus, ModIface, ModDetails)
325 type InteractiveResult = (InteractiveStatus, ModIface, ModDetails)
327 -- FIXME: The old interface and module index are only using in 'batch' and
328 -- 'interactive' mode. They should be removed from 'oneshot' mode.
329 type Compiler result = GhcMonad m =>
332 -> Bool -- True <=> source unchanged
333 -> Maybe ModIface -- Old interface, if available
334 -> Maybe (Int,Int) -- Just (i,n) <=> module i of n (for msgs)
339 -- | The main interface.
340 hscCompile :: GhcMonad m =>
341 HscEnv -> ModSummary -> Bool
342 -> Maybe ModIface -> Maybe (Int, Int)
345 -- | Called when no recompilation is necessary.
346 hscNoRecomp :: GhcMonad m =>
349 -- | Called to recompile the module.
350 hscRecompile :: GhcMonad m =>
351 ModSummary -> Maybe Fingerprint -> m a,
353 hscBackend :: GhcMonad m =>
354 TcGblEnv -> ModSummary -> Maybe Fingerprint -> m a,
356 -- | Code generation for Boot modules.
357 hscGenBootOutput :: GhcMonad m =>
358 TcGblEnv -> ModSummary -> Maybe Fingerprint -> m a,
360 -- | Code generation for normal modules.
361 hscGenOutput :: GhcMonad m =>
362 ModGuts -> ModSummary -> Maybe Fingerprint -> m a
365 genericHscCompile :: GhcMonad m =>
367 -> (Maybe (Int,Int) -> Bool -> ModSummary -> m ())
368 -> HscEnv -> ModSummary -> Bool
369 -> Maybe ModIface -> Maybe (Int, Int)
371 genericHscCompile compiler hscMessage
372 hsc_env mod_summary source_unchanged
373 mb_old_iface0 mb_mod_index =
374 withTempSession (\_ -> hsc_env) $ do
375 (recomp_reqd, mb_checked_iface)
376 <- {-# SCC "checkOldIface" #-}
377 liftIO $ checkOldIface hsc_env mod_summary
378 source_unchanged mb_old_iface0
379 -- save the interface that comes back from checkOldIface.
380 -- In one-shot mode we don't have the old iface until this
381 -- point, when checkOldIface reads it from the disk.
382 let mb_old_hash = fmap mi_iface_hash mb_checked_iface
383 case mb_checked_iface of
384 Just iface | not recomp_reqd
385 -> do hscMessage mb_mod_index False mod_summary
386 hscNoRecomp compiler iface
388 -> do hscMessage mb_mod_index True mod_summary
389 hscRecompile compiler mod_summary mb_old_hash
391 genericHscRecompile :: GhcMonad m =>
393 -> ModSummary -> Maybe Fingerprint
395 genericHscRecompile compiler mod_summary mb_old_hash
396 | ExtCoreFile <- ms_hsc_src mod_summary =
397 panic "GHC does not currently support reading External Core files"
399 tc_result <- hscFileFrontEnd mod_summary
400 hscBackend compiler tc_result mod_summary mb_old_hash
402 genericHscBackend :: GhcMonad m =>
404 -> TcGblEnv -> ModSummary -> Maybe Fingerprint
406 genericHscBackend compiler tc_result mod_summary mb_old_hash
407 | HsBootFile <- ms_hsc_src mod_summary =
408 hscGenBootOutput compiler tc_result mod_summary mb_old_hash
410 guts <- hscDesugar mod_summary tc_result
411 hscGenOutput compiler guts mod_summary mb_old_hash
413 --------------------------------------------------------------
415 --------------------------------------------------------------
417 hscOneShotCompiler :: HsCompiler OneShotResult
421 hscCompile = \hsc_env mod_summary src_changed mb_old_iface mb_i_of_n -> do
422 -- One-shot mode needs a knot-tying mutable variable for interface
423 -- files. See TcRnTypes.TcGblEnv.tcg_type_env_var.
424 type_env_var <- liftIO $ newIORef emptyNameEnv
426 mod = ms_mod mod_summary
427 hsc_env' = hsc_env{ hsc_type_env_var = Just (mod, type_env_var) }
429 genericHscCompile hscOneShotCompiler
430 oneShotMsg hsc_env' mod_summary src_changed
431 mb_old_iface mb_i_of_n
433 , hscNoRecomp = \_old_iface -> do
434 withSession (liftIO . dumpIfaceStats)
437 , hscRecompile = genericHscRecompile hscOneShotCompiler
439 , hscBackend = genericHscBackend hscOneShotCompiler
441 , hscGenBootOutput = \tc_result mod_summary mb_old_iface -> do
442 (iface, changed, _) <- hscSimpleIface tc_result mb_old_iface
443 hscWriteIface iface changed mod_summary
444 return (HscRecomp False ())
446 , hscGenOutput = \guts0 mod_summary mb_old_iface -> do
447 guts <- hscSimplify guts0
448 (iface, changed, _details, cgguts)
449 <- hscNormalIface guts mb_old_iface
450 hscWriteIface iface changed mod_summary
451 hasStub <- hscGenHardCode cgguts mod_summary
452 return (HscRecomp hasStub ())
455 -- Compile Haskell, boot and extCore in OneShot mode.
456 hscCompileOneShot :: Compiler OneShotResult
457 hscCompileOneShot = hscCompile hscOneShotCompiler
459 --------------------------------------------------------------
461 hscBatchCompiler :: HsCompiler BatchResult
465 hscCompile = genericHscCompile hscBatchCompiler batchMsg
467 , hscNoRecomp = \iface -> do
468 details <- genModDetails iface
469 return (HscNoRecomp, iface, details)
471 , hscRecompile = genericHscRecompile hscBatchCompiler
473 , hscBackend = genericHscBackend hscBatchCompiler
475 , hscGenBootOutput = \tc_result mod_summary mb_old_iface -> do
476 (iface, changed, details)
477 <- hscSimpleIface tc_result mb_old_iface
478 hscWriteIface iface changed mod_summary
479 return (HscRecomp False (), iface, details)
481 , hscGenOutput = \guts0 mod_summary mb_old_iface -> do
482 guts <- hscSimplify guts0
483 (iface, changed, details, cgguts)
484 <- hscNormalIface guts mb_old_iface
485 hscWriteIface iface changed mod_summary
486 hasStub <- hscGenHardCode cgguts mod_summary
487 return (HscRecomp hasStub (), iface, details)
490 -- Compile Haskell, boot and extCore in batch mode.
491 hscCompileBatch :: Compiler (HscStatus, ModIface, ModDetails)
492 hscCompileBatch = hscCompile hscBatchCompiler
494 --------------------------------------------------------------
496 hscInteractiveCompiler :: HsCompiler InteractiveResult
497 hscInteractiveCompiler =
499 hscCompile = genericHscCompile hscInteractiveCompiler batchMsg
501 , hscNoRecomp = \iface -> do
502 details <- genModDetails iface
503 return (HscNoRecomp, iface, details)
505 , hscRecompile = genericHscRecompile hscInteractiveCompiler
507 , hscBackend = genericHscBackend hscInteractiveCompiler
509 , hscGenBootOutput = \tc_result _mod_summary mb_old_iface -> do
510 (iface, _changed, details) <- hscSimpleIface tc_result mb_old_iface
511 return (HscRecomp False Nothing, iface, details)
513 , hscGenOutput = \guts0 mod_summary mb_old_iface -> do
514 guts <- hscSimplify guts0
515 (iface, _changed, details, cgguts)
516 <- hscNormalIface guts mb_old_iface
517 hscInteractive (iface, details, cgguts) mod_summary
520 -- Compile Haskell, extCore to bytecode.
521 hscCompileInteractive :: Compiler (InteractiveStatus, ModIface, ModDetails)
522 hscCompileInteractive = hscCompile hscInteractiveCompiler
524 --------------------------------------------------------------
526 hscNothingCompiler :: HsCompiler NothingResult
529 hscCompile = genericHscCompile hscNothingCompiler batchMsg
531 , hscNoRecomp = \iface -> do
532 details <- genModDetails iface
533 return (HscNoRecomp, iface, details)
535 , hscRecompile = \mod_summary mb_old_hash ->
536 case ms_hsc_src mod_summary of
538 panic "hscCompileNothing: cannot do external core"
540 tc_result <- hscFileFrontEnd mod_summary
541 hscBackend hscNothingCompiler tc_result mod_summary mb_old_hash
543 , hscBackend = \tc_result _mod_summary mb_old_iface -> do
544 (iface, _changed, details) <- hscSimpleIface tc_result mb_old_iface
545 return (HscRecomp False (), iface, details)
547 , hscGenBootOutput = \_ _ _ ->
548 panic "hscCompileNothing: hscGenBootOutput should not be called"
550 , hscGenOutput = \_ _ _ ->
551 panic "hscCompileNothing: hscGenOutput should not be called"
553 -- Type-check Haskell and .hs-boot only (no external core)
554 hscCompileNothing :: Compiler (HscStatus, ModIface, ModDetails)
555 hscCompileNothing = hscCompile hscNothingCompiler
557 --------------------------------------------------------------
559 --------------------------------------------------------------
561 genModDetails :: GhcMonad m => ModIface -> m ModDetails
562 genModDetails old_iface =
563 withSession $ \hsc_env -> liftIO $ do
564 new_details <- {-# SCC "tcRnIface" #-}
565 initIfaceCheck hsc_env $
566 typecheckIface old_iface
567 dumpIfaceStats hsc_env
570 --------------------------------------------------------------
571 -- Progress displayers.
572 --------------------------------------------------------------
574 oneShotMsg :: GhcMonad m => Maybe (Int,Int) -> Bool -> ModSummary -> m ()
575 oneShotMsg _mb_mod_index recomp _mod_summary
576 = do hsc_env <- getSession
580 else compilationProgressMsg (hsc_dflags hsc_env) $
581 "compilation IS NOT required"
583 batchMsg :: GhcMonad m => Maybe (Int,Int) -> Bool -> ModSummary -> m ()
584 batchMsg mb_mod_index recomp mod_summary
585 = do hsc_env <- getSession
586 let showMsg msg = compilationProgressMsg (hsc_dflags hsc_env) $
587 (showModuleIndex mb_mod_index ++
588 msg ++ showModMsg (hscTarget (hsc_dflags hsc_env)) recomp mod_summary)
591 then showMsg "Compiling "
592 else if verbosity (hsc_dflags hsc_env) >= 2
593 then showMsg "Skipping "
596 --------------------------------------------------------------
598 --------------------------------------------------------------
599 hscFileFrontEnd :: GhcMonad m => ModSummary -> m TcGblEnv
600 hscFileFrontEnd mod_summary =
601 do rdr_module <- hscParse mod_summary
602 hscTypecheck mod_summary rdr_module
604 --------------------------------------------------------------
606 --------------------------------------------------------------
608 hscSimplify :: GhcMonad m => ModGuts -> m ModGuts
609 hscSimplify ds_result
610 = do hsc_env <- getSession
611 simpl_result <- {-# SCC "Core2Core" #-}
612 liftIO $ core2core hsc_env ds_result
615 --------------------------------------------------------------
616 -- Interface generators
617 --------------------------------------------------------------
619 hscSimpleIface :: GhcMonad m =>
622 -> m (ModIface, Bool, ModDetails)
623 hscSimpleIface tc_result mb_old_iface
624 = do hsc_env <- getSession
625 details <- liftIO $ mkBootModDetailsTc hsc_env tc_result
626 (new_iface, no_change)
627 <- {-# SCC "MkFinalIface" #-}
628 ioMsgMaybe $ mkIfaceTc hsc_env mb_old_iface details tc_result
629 -- And the answer is ...
630 liftIO $ dumpIfaceStats hsc_env
631 return (new_iface, no_change, details)
633 hscNormalIface :: GhcMonad m =>
636 -> m (ModIface, Bool, ModDetails, CgGuts)
637 hscNormalIface simpl_result mb_old_iface
638 = do hsc_env <- getSession
640 (cg_guts, details) <- {-# SCC "CoreTidy" #-}
641 liftIO $ tidyProgram hsc_env simpl_result
643 -- BUILD THE NEW ModIface and ModDetails
644 -- and emit external core if necessary
645 -- This has to happen *after* code gen so that the back-end
646 -- info has been set. Not yet clear if it matters waiting
647 -- until after code output
648 (new_iface, no_change)
649 <- {-# SCC "MkFinalIface" #-}
650 ioMsgMaybe $ mkIface hsc_env mb_old_iface
652 -- Emit external core
653 -- This should definitely be here and not after CorePrep,
654 -- because CorePrep produces unqualified constructor wrapper declarations,
655 -- so its output isn't valid External Core (without some preprocessing).
656 liftIO $ emitExternalCore (hsc_dflags hsc_env) cg_guts
657 liftIO $ dumpIfaceStats hsc_env
659 -- Return the prepared code.
660 return (new_iface, no_change, details, cg_guts)
662 --------------------------------------------------------------
663 -- BackEnd combinators
664 --------------------------------------------------------------
666 hscWriteIface :: GhcMonad m =>
670 hscWriteIface iface no_change mod_summary
671 = do hsc_env <- getSession
672 let dflags = hsc_dflags hsc_env
675 $ writeIfaceFile dflags (ms_location mod_summary) iface
677 -- | Compile to hard-code.
678 hscGenHardCode :: GhcMonad m =>
680 -> m Bool -- ^ @True@ <=> stub.c exists
681 hscGenHardCode cgguts mod_summary
682 = withSession $ \hsc_env -> liftIO $ do
683 let CgGuts{ -- This is the last use of the ModGuts in a compilation.
684 -- From now on, we just use the bits we need.
685 cg_module = this_mod,
686 cg_binds = core_binds,
688 cg_dir_imps = dir_imps,
689 cg_foreign = foreign_stubs,
690 cg_dep_pkgs = dependencies,
691 cg_hpc_info = hpc_info } = cgguts
692 dflags = hsc_dflags hsc_env
693 location = ms_location mod_summary
694 data_tycons = filter isDataTyCon tycons
695 -- cg_tycons includes newtypes, for the benefit of External Core,
696 -- but we don't generate any code for newtypes
699 -- PREPARE FOR CODE GENERATION
700 -- Do saturation and convert to A-normal form
701 prepd_binds <- {-# SCC "CorePrep" #-}
702 corePrepPgm dflags core_binds data_tycons ;
703 ----------------- Convert to STG ------------------
704 (stg_binds, cost_centre_info)
705 <- {-# SCC "CoreToStg" #-}
706 myCoreToStg dflags this_mod prepd_binds
708 ------------------ Code generation ------------------
709 cmms <- if dopt Opt_TryNewCodeGen (hsc_dflags hsc_env)
710 then do cmms <- tryNewCodeGen hsc_env this_mod data_tycons
711 dir_imps cost_centre_info
714 else {-# SCC "CodeGen" #-}
715 codeGen dflags this_mod data_tycons
716 dir_imps cost_centre_info
719 --- Optionally run experimental Cmm transformations ---
720 cmms <- optionallyConvertAndOrCPS hsc_env cmms
721 -- unless certain dflags are on, the identity function
722 ------------------ Code output -----------------------
723 rawcmms <- cmmToRawCmm cmms
724 (_stub_h_exists, stub_c_exists)
725 <- codeOutput dflags this_mod location foreign_stubs
729 hscInteractive :: GhcMonad m =>
730 (ModIface, ModDetails, CgGuts)
732 -> m (InteractiveStatus, ModIface, ModDetails)
734 hscInteractive (iface, details, cgguts) mod_summary
735 = do hsc_env <- getSession
737 let CgGuts{ -- This is the last use of the ModGuts in a compilation.
738 -- From now on, we just use the bits we need.
739 cg_module = this_mod,
740 cg_binds = core_binds,
742 cg_foreign = foreign_stubs,
743 cg_modBreaks = mod_breaks } = cgguts
744 dflags = hsc_dflags hsc_env
745 location = ms_location mod_summary
746 data_tycons = filter isDataTyCon tycons
747 -- cg_tycons includes newtypes, for the benefit of External Core,
748 -- but we don't generate any code for newtypes
751 -- PREPARE FOR CODE GENERATION
752 -- Do saturation and convert to A-normal form
753 prepd_binds <- {-# SCC "CorePrep" #-}
754 corePrepPgm dflags core_binds data_tycons ;
755 ----------------- Generate byte code ------------------
756 comp_bc <- byteCodeGen dflags prepd_binds data_tycons mod_breaks
757 ------------------ Create f-x-dynamic C-side stuff ---
758 (_istub_h_exists, istub_c_exists)
759 <- outputForeignStubs dflags this_mod location foreign_stubs
760 return (HscRecomp istub_c_exists (Just (comp_bc, mod_breaks))
763 hscInteractive _ _ = panic "GHC not compiled with interpreter"
766 ------------------------------
768 hscCmmFile :: GhcMonad m => HscEnv -> FilePath -> m ()
769 hscCmmFile hsc_env filename = do
770 dflags <- return $ hsc_dflags hsc_env
772 parseCmmFile dflags filename
773 cmms <- liftIO $ optionallyConvertAndOrCPS hsc_env [cmm]
774 rawCmms <- liftIO $ cmmToRawCmm cmms
775 liftIO $ codeOutput dflags no_mod no_loc NoStubs [] rawCmms
778 no_mod = panic "hscCmmFile: no_mod"
779 no_loc = ModLocation{ ml_hs_file = Just filename,
780 ml_hi_file = panic "hscCmmFile: no hi file",
781 ml_obj_file = panic "hscCmmFile: no obj file" }
783 -------------------- Stuff for new code gen ---------------------
785 tryNewCodeGen :: HscEnv -> Module -> [TyCon] -> [Module]
787 -> [(StgBinding,[(Id,[Id])])]
790 tryNewCodeGen hsc_env this_mod data_tycons imported_mods
791 cost_centre_info stg_binds hpc_info
792 | not (dopt Opt_TryNewCodeGen (hsc_dflags hsc_env))
795 = do { let dflags = hsc_dflags hsc_env
796 ; prog <- StgCmm.codeGen dflags this_mod data_tycons imported_mods
797 cost_centre_info stg_binds hpc_info
798 ; dumpIfSet_dyn dflags Opt_D_dump_cmmz "Cmm produced by new codegen"
801 ; prog <- return $ map (runTx $ runCmmOpts cmmCfgOptsZ) prog
802 -- Control flow optimisation
804 -- Note: Have to thread the module's SRT through all the procedures
805 -- because we greedily build it as we go.
806 ; us <- mkSplitUniqSupply 'S'
807 ; let topSRT = initUs_ us emptySRT
808 ; (topSRT, prog) <- foldM (protoCmmCPSZ hsc_env) (topSRT, []) prog
809 -- The main CPS conversion
811 ; prog <- return $ map (runTx $ runCmmOpts cmmCfgOptsZ) (srtToData topSRT : prog)
812 -- Control flow optimisation, again
814 ; dumpIfSet_dyn dflags Opt_D_dump_cmmz "Output Cmm" (pprCmms prog)
816 ; let prog' = map cmmOfZgraph prog
817 ; dumpIfSet_dyn dflags Opt_D_dump_cmmz "Raw Cmm" (ppr prog')
821 optionallyConvertAndOrCPS :: HscEnv -> [Cmm] -> IO [Cmm]
822 optionallyConvertAndOrCPS hsc_env cmms =
823 do let dflags = hsc_dflags hsc_env
824 -------- Optionally convert to and from zipper ------
825 cmms <- if dopt Opt_ConvertToZipCfgAndBack dflags
826 then mapM (testCmmConversion hsc_env) cmms
828 --------- Optionally convert to CPS (MDA) -----------
829 cmms <- if not (dopt Opt_ConvertToZipCfgAndBack dflags) &&
830 dopt Opt_RunCPS dflags
831 then cmmCPS dflags cmms
836 testCmmConversion :: HscEnv -> Cmm -> IO Cmm
837 testCmmConversion hsc_env cmm =
838 do let dflags = hsc_dflags hsc_env
839 showPass dflags "CmmToCmm"
840 dumpIfSet_dyn dflags Opt_D_dump_cvt_cmm "C-- pre-conversion" (ppr cmm)
841 --continuationC <- cmmCPS dflags abstractC >>= cmmToRawCmm
842 us <- mkSplitUniqSupply 'C'
843 let cfopts = runTx $ runCmmOpts cmmCfgOptsZ
844 let cvtm = do g <- cmmToZgraph cmm
846 let zgraph = initUs_ us cvtm
847 us <- mkSplitUniqSupply 'S'
848 let topSRT = initUs_ us emptySRT
849 (_, [cps_zgraph]) <- protoCmmCPSZ hsc_env (topSRT, []) zgraph
850 let chosen_graph = if dopt Opt_RunCPSZ dflags then cps_zgraph else zgraph
851 dumpIfSet_dyn dflags Opt_D_dump_cmmz "C-- Zipper Graph" (ppr chosen_graph)
852 showPass dflags "Convert from Z back to Cmm"
853 let cvt = cmmOfZgraph $ cfopts $ chosen_graph
854 dumpIfSet_dyn dflags Opt_D_dump_cvt_cmm "C-- post-conversion" (ppr cvt)
856 -- return cmm -- don't use the conversion
858 myCoreToStg :: DynFlags -> Module -> [CoreBind]
859 -> IO ( [(StgBinding,[(Id,[Id])])] -- output program
860 , CollectedCCs) -- cost centre info (declared and used)
862 myCoreToStg dflags this_mod prepd_binds
864 stg_binds <- {-# SCC "Core2Stg" #-}
865 coreToStg (thisPackage dflags) prepd_binds
867 (stg_binds2, cost_centre_info) <- {-# SCC "Stg2Stg" #-}
868 stg2stg dflags this_mod stg_binds
870 return (stg_binds2, cost_centre_info)
874 %************************************************************************
876 \subsection{Compiling a do-statement}
878 %************************************************************************
880 When the UnlinkedBCOExpr is linked you get an HValue of type
882 When you run it you get a list of HValues that should be
883 the same length as the list of names; add them to the ClosureEnv.
885 A naked expression returns a singleton Name [it].
887 What you type The IO [HValue] that hscStmt returns
888 ------------- ------------------------------------
889 let pat = expr ==> let pat = expr in return [coerce HVal x, coerce HVal y, ...]
892 pat <- expr ==> expr >>= \ pat -> return [coerce HVal x, coerce HVal y, ...]
895 expr (of IO type) ==> expr >>= \ v -> return [v]
896 [NB: result not printed] bindings: [it]
899 expr (of non-IO type,
900 result showable) ==> let v = expr in print v >> return [v]
903 expr (of non-IO type,
904 result not showable) ==> error
908 hscStmt -- Compile a stmt all the way to an HValue, but don't run it
911 -> String -- The statement
912 -> m (Maybe ([Id], HValue))
913 -- ^ 'Nothing' <==> empty statement (or comment only), but no parse error
914 hscStmt hsc_env stmt = do
915 maybe_stmt <- hscParseStmt (hsc_dflags hsc_env) stmt
917 Nothing -> return Nothing
918 Just parsed_stmt -> do -- The real stuff
920 -- Rename and typecheck it
921 let icontext = hsc_IC hsc_env
922 (ids, tc_expr) <- ioMsgMaybe $ tcRnStmt hsc_env icontext parsed_stmt
924 let rdr_env = ic_rn_gbl_env icontext
925 type_env = mkTypeEnv (map AnId (ic_tmp_ids icontext))
926 ds_expr <- ioMsgMaybe $
927 deSugarExpr hsc_env iNTERACTIVE rdr_env type_env tc_expr
929 -- Then desugar, code gen, and link it
930 let src_span = srcLocSpan interactiveSrcLoc
931 hval <- liftIO $ compileExpr hsc_env src_span ds_expr
933 return $ Just (ids, hval)
936 hscTcExpr -- Typecheck an expression (but don't run it)
939 -> String -- The expression
942 hscTcExpr hsc_env expr = do
943 maybe_stmt <- hscParseStmt (hsc_dflags hsc_env) expr
944 let icontext = hsc_IC hsc_env
946 Just (L _ (ExprStmt expr _ _)) -> do
947 ty <- ioMsgMaybe $ tcRnExpr hsc_env icontext expr
949 _ -> do throw $ mkSrcErr $ unitBag $ mkPlainErrMsg
951 (text "not an expression:" <+> quotes (text expr))
953 -- | Find the kind of a type
957 -> String -- ^ The type
960 hscKcType hsc_env str = do
961 ty <- hscParseType (hsc_dflags hsc_env) str
962 let icontext = hsc_IC hsc_env
963 ioMsgMaybe $ tcRnType hsc_env icontext ty
970 hscParseStmt :: GhcMonad m => DynFlags -> String -> m (Maybe (LStmt RdrName))
971 hscParseStmt = hscParseThing parseStmt
973 hscParseType :: GhcMonad m => DynFlags -> String -> m (LHsType RdrName)
974 hscParseType = hscParseThing parseType
977 hscParseIdentifier :: GhcMonad m => DynFlags -> String -> m (Located RdrName)
978 hscParseIdentifier = hscParseThing parseIdentifier
980 hscParseThing :: (Outputable thing, GhcMonad m)
982 -> DynFlags -> String
984 -- Nothing => Parse error (message already printed)
986 hscParseThing parser dflags str
987 = (liftIO $ showPass dflags "Parser") >>
988 {-# SCC "Parser" #-} do
990 buf <- liftIO $ stringToStringBuffer str
992 let loc = mkSrcLoc (fsLit "<interactive>") 1 0
994 case unP parser (mkPState buf loc dflags) of
996 PFailed span err -> do
997 let msg = mkPlainErrMsg span err
998 throw (mkSrcErr (unitBag msg))
1002 let ms@(warns, errs) = getMessages pst
1004 when (errorsFound dflags ms) $ -- handle -Werror
1005 throw (mkSrcErr errs)
1007 --ToDo: can't free the string buffer until we've finished this
1008 -- compilation sweep and all the identifiers have gone away.
1009 liftIO $ dumpIfSet_dyn dflags Opt_D_dump_parsed "Parser" (ppr thing)
1013 %************************************************************************
1015 Desugar, simplify, convert to bytecode, and link an expression
1017 %************************************************************************
1021 compileExpr :: HscEnv -> SrcSpan -> CoreExpr -> IO HValue
1023 compileExpr hsc_env srcspan ds_expr
1024 = do { let { dflags = hsc_dflags hsc_env ;
1025 lint_on = dopt Opt_DoCoreLinting dflags }
1028 ; simpl_expr <- simplifyExpr dflags ds_expr
1030 -- Tidy it (temporary, until coreSat does cloning)
1031 ; let tidy_expr = tidyExpr emptyTidyEnv simpl_expr
1033 -- Prepare for codegen
1034 ; prepd_expr <- corePrepExpr dflags tidy_expr
1036 -- Lint if necessary
1037 -- ToDo: improve SrcLoc
1039 let ictxt = hsc_IC hsc_env
1040 tyvars = varSetElems (ic_tyvars ictxt)
1042 case lintUnfolding noSrcLoc tyvars prepd_expr of
1043 Just err -> pprPanic "compileExpr" err
1044 Nothing -> return ()
1049 ; bcos <- coreExprToBCOs dflags prepd_expr
1052 ; hval <- linkExpr hsc_env srcspan bcos
1060 %************************************************************************
1062 Statistics on reading interfaces
1064 %************************************************************************
1067 dumpIfaceStats :: HscEnv -> IO ()
1068 dumpIfaceStats hsc_env
1069 = do { eps <- readIORef (hsc_EPS hsc_env)
1070 ; dumpIfSet (dump_if_trace || dump_rn_stats)
1071 "Interface statistics"
1074 dflags = hsc_dflags hsc_env
1075 dump_rn_stats = dopt Opt_D_dump_rn_stats dflags
1076 dump_if_trace = dopt Opt_D_dump_if_trace dflags
1079 %************************************************************************
1081 Progress Messages: Module i of n
1083 %************************************************************************
1086 showModuleIndex :: Maybe (Int, Int) -> String
1087 showModuleIndex Nothing = ""
1088 showModuleIndex (Just (i,n)) = "[" ++ padded ++ " of " ++ n_str ++ "] "
1092 padded = replicate (length n_str - length i_str) ' ' ++ i_str