2 {-# OPTIONS -fno-warn-missing-fields #-}
3 -- The above warning supression flag is a temporary kludge.
4 -- While working on this module you are encouraged to remove it and fix
5 -- any warnings in the module. See
6 -- http://hackage.haskell.org/trac/ghc/wiki/Commentary/CodingStyle#Warnings
9 -----------------------------------------------------------------------------
13 -- Most flags are dynamic flags, which means they can change from
14 -- compilation to compilation using OPTIONS_GHC pragmas, and in a
15 -- multi-session GHC each session can be using different dynamic
16 -- flags. Dynamic flags can also be set at the prompt in GHCi.
18 -- (c) The University of Glasgow 2005
20 -----------------------------------------------------------------------------
26 HscTarget(..), isObjectTarget, defaultObjectTarget,
27 GhcMode(..), isOneShot,
28 GhcLink(..), isNoLink,
34 -- Configuration of the core-to-core and stg-to-stg phases
38 SimplifierMode(..), FloatOutSwitches(..),
39 getCoreToDo, getStgToDo,
41 -- Manipulating DynFlags
42 defaultDynFlags, -- DynFlags
43 initDynFlags, -- DynFlags -> IO DynFlags
45 dopt, -- DynFlag -> DynFlags -> Bool
46 dopt_set, dopt_unset, -- DynFlags -> DynFlag -> DynFlags
47 getOpts, -- (DynFlags -> [a]) -> IO [a]
58 machdepCCOpts, picCCOpts,
63 -- XXX This define is a bit of a hack, and should be done more nicely
64 #define FAST_STRING_NOT_NEEDED 1
65 #include "HsVersions.h"
69 import PrelNames ( mAIN )
70 #ifdef i386_TARGET_ARCH
71 import StaticFlags ( opt_Static )
73 import StaticFlags ( opt_PIC, WayName(..), v_Ways, v_Build_tag,
75 import {-# SOURCE #-} Packages (PackageState)
76 import DriverPhases ( Phase(..), phaseInputExt )
79 import Constants ( mAX_CONTEXT_REDUCTION_DEPTH )
80 import Panic ( panic, GhcException(..) )
81 import UniqFM ( UniqFM )
83 import Maybes ( orElse, fromJust )
84 import SrcLoc ( SrcSpan )
86 import {-# SOURCE #-} ErrUtils ( Severity(..), Message, mkLocMessage )
88 import Data.IORef ( readIORef )
89 import Control.Exception ( throwDyn )
90 import Control.Monad ( when )
93 import System.FilePath
94 import System.IO ( hPutStrLn, stderr )
96 -- -----------------------------------------------------------------------------
104 | Opt_D_dump_cmmz_pretty
108 | Opt_D_dump_asm_native
109 | Opt_D_dump_asm_liveness
110 | Opt_D_dump_asm_coalesce
111 | Opt_D_dump_asm_regalloc
112 | Opt_D_dump_asm_regalloc_stages
113 | Opt_D_dump_asm_conflicts
114 | Opt_D_dump_asm_stats
120 | Opt_D_dump_inlinings
121 | Opt_D_dump_rule_firings
122 | Opt_D_dump_occur_anal
126 | Opt_D_dump_simpl_iterations
127 | Opt_D_dump_simpl_phases
136 | Opt_D_dump_worker_wrapper
137 | Opt_D_dump_rn_trace
138 | Opt_D_dump_rn_stats
140 | Opt_D_dump_simpl_stats
141 | Opt_D_dump_tc_trace
142 | Opt_D_dump_if_trace
148 | Opt_D_verbose_core2core
149 | Opt_D_verbose_stg2stg
151 | Opt_D_dump_hi_diffs
152 | Opt_D_dump_minimal_imports
153 | Opt_D_dump_mod_cycles
154 | Opt_D_dump_view_pattern_commoning
155 | Opt_D_faststring_stats
156 | Opt_DumpToFile -- ^ Append dump output to files instead of stdout.
162 | Opt_WarnIsError -- -Werror; makes warnings fatal
163 | Opt_WarnDuplicateExports
165 | Opt_WarnImplicitPrelude
166 | Opt_WarnIncompletePatterns
167 | Opt_WarnIncompletePatternsRecUpd
168 | Opt_WarnMissingFields
169 | Opt_WarnMissingMethods
170 | Opt_WarnMissingSigs
171 | Opt_WarnNameShadowing
172 | Opt_WarnOverlappingPatterns
173 | Opt_WarnSimplePatterns
174 | Opt_WarnTypeDefaults
175 | Opt_WarnMonomorphism
176 | Opt_WarnUnusedBinds
177 | Opt_WarnUnusedImports
178 | Opt_WarnUnusedMatches
179 | Opt_WarnDeprecations
180 | Opt_WarnDodgyImports
185 | Opt_OverlappingInstances
186 | Opt_UndecidableInstances
187 | Opt_IncoherentInstances
188 | Opt_MonomorphismRestriction
190 | Opt_ExtendedDefaultRules -- Use GHC's extended rules for defaulting
191 | Opt_ForeignFunctionInterface
192 | Opt_UnliftedFFITypes
193 | Opt_PArr -- Syntactic support for parallel arrays
194 | Opt_Arrows -- Arrow-notation syntax
195 | Opt_TemplateHaskell
199 | Opt_ImplicitPrelude
200 | Opt_ScopedTypeVariables
204 | Opt_OverloadedStrings
205 | Opt_DisambiguateRecordFields
206 | Opt_RecordWildCards
211 | Opt_StandaloneDeriving
212 | Opt_DeriveDataTypeable
213 | Opt_TypeSynonymInstances
214 | Opt_FlexibleContexts
215 | Opt_FlexibleInstances
216 | Opt_ConstrainedClassMethods
217 | Opt_MultiParamTypeClasses
218 | Opt_FunctionalDependencies
220 | Opt_PolymorphicComponents
221 | Opt_ExistentialQuantification
225 | Opt_PatternSignatures
226 | Opt_ParallelListComp
227 | Opt_TransformListComp
228 | Opt_GeneralizedNewtypeDeriving
231 | Opt_LiberalTypeSynonyms
234 | Opt_ImpredicativeTypes
237 | Opt_PrintExplicitForalls
245 | Opt_IgnoreInterfacePragmas
246 | Opt_OmitInterfacePragmas
247 | Opt_DoLambdaEtaExpansion
251 | Opt_UnboxStrictFields
255 | Opt_RegsGraph -- do graph coloring register allocation
256 | Opt_RegsIterative -- do iterative coalescing graph coloring register allocation
264 | Opt_ExcessPrecision
265 | Opt_ReadUserPackageConf
269 | Opt_HideAllPackages
270 | Opt_PrintBindResult
274 | Opt_BreakOnException
276 | Opt_PrintEvldWithShow
277 | Opt_PrintBindContents
281 | Opt_ConvertToZipCfgAndBack
292 data DynFlags = DynFlags {
295 coreToDo :: Maybe [CoreToDo], -- reserved for -Ofile
296 stgToDo :: Maybe [StgToDo], -- similarly
297 hscTarget :: HscTarget,
298 hscOutName :: String, -- name of the output file
299 extCoreName :: String, -- name of the .core output file
300 verbosity :: Int, -- verbosity level
301 optLevel :: Int, -- optimisation level
302 simplPhases :: Int, -- number of simplifier phases
303 maxSimplIterations :: Int, -- max simplifier iterations
304 shouldDumpSimplPhase :: SimplifierMode -> Bool,
305 ruleCheck :: Maybe String,
307 specConstrThreshold :: Maybe Int, -- Threshold for SpecConstr
308 liberateCaseThreshold :: Maybe Int, -- Threshold for LiberateCase
310 stolen_x86_regs :: Int,
311 cmdlineHcIncludes :: [String], -- -#includes
312 importPaths :: [FilePath],
314 mainFunIs :: Maybe String,
315 ctxtStkDepth :: Int, -- Typechecker context stack depth
317 thisPackage :: PackageId,
320 wayNames :: [WayName], -- way flags from the cmd line
321 buildTag :: String, -- the global "way" (eg. "p" for prof)
322 rtsBuildTag :: String, -- the RTS "way"
325 objectDir :: Maybe String,
326 hiDir :: Maybe String,
327 stubDir :: Maybe String,
333 outputFile :: Maybe String,
334 outputHi :: Maybe String,
335 dynLibLoader :: DynLibLoader,
337 -- | This is set by DriverPipeline.runPipeline based on where
338 -- its output is going.
339 dumpPrefix :: Maybe FilePath,
341 -- | Override the dumpPrefix set by runPipeline.
342 -- Set by -ddump-file-prefix
343 dumpPrefixForce :: Maybe FilePath,
345 includePaths :: [String],
346 libraryPaths :: [String],
347 frameworkPaths :: [String], -- used on darwin only
348 cmdlineFrameworks :: [String], -- ditto
349 tmpDir :: String, -- no trailing '/'
351 ghcUsagePath :: FilePath, -- Filled in by SysTools
352 ghciUsagePath :: FilePath, -- ditto
354 hpcDir :: String, -- ^ path to store the .mix files
356 -- options for particular phases
365 opt_windres :: [String],
367 -- commands for particular phases
369 pgm_P :: (String,[Option]),
371 pgm_c :: (String,[Option]),
372 pgm_m :: (String,[Option]),
373 pgm_s :: (String,[Option]),
374 pgm_a :: (String,[Option]),
375 pgm_l :: (String,[Option]),
376 pgm_dll :: (String,[Option]),
378 pgm_sysman :: String,
379 pgm_windres :: String,
382 extraPkgConfs :: [FilePath],
383 topDir :: FilePath, -- filled in by SysTools
384 systemPackageConfig :: FilePath, -- ditto
385 -- The -package-conf flags given on the command line, in the order
388 packageFlags :: [PackageFlag],
389 -- The -package and -hide-package flags from the command-line
392 -- NB. do not modify this field, it is calculated by
393 -- Packages.initPackages and Packages.updatePackages.
394 pkgDatabase :: Maybe (UniqFM PackageConfig),
395 pkgState :: PackageState,
401 log_action :: Severity -> SrcSpan -> PprStyle -> Message -> IO (),
403 haddockOptions :: Maybe String
414 -- | will this target result in an object file on the disk?
415 isObjectTarget :: HscTarget -> Bool
416 isObjectTarget HscC = True
417 isObjectTarget HscAsm = True
418 isObjectTarget _ = False
420 -- | The 'GhcMode' tells us whether we're doing multi-module
421 -- compilation (controlled via the "GHC" API) or one-shot
422 -- (single-module) compilation. This makes a difference primarily to
423 -- the "Finder": in one-shot mode we look for interface files for
424 -- imported modules, but in multi-module mode we look for source files
425 -- in order to check whether they need to be recompiled.
427 = CompManager -- ^ --make, GHCi, etc.
428 | OneShot -- ^ ghc -c Foo.hs
429 | MkDepend -- ^ ghc -M, see Finder for why we need this
432 isOneShot :: GhcMode -> Bool
433 isOneShot OneShot = True
434 isOneShot _other = False
436 -- | What kind of linking to do.
437 data GhcLink -- What to do in the link step, if there is one
438 = NoLink -- Don't link at all
439 | LinkBinary -- Link object code into a binary
440 | LinkInMemory -- Use the in-memory dynamic linker
441 | LinkDynLib -- Link objects into a dynamic lib (DLL on Windows, DSO on ELF platforms)
444 isNoLink :: GhcLink -> Bool
445 isNoLink NoLink = True
449 = ExposePackage String
451 | IgnorePackage String
454 defaultHscTarget :: HscTarget
455 defaultHscTarget = defaultObjectTarget
457 -- | the 'HscTarget' value corresponding to the default way to create
458 -- object files on the current platform.
459 defaultObjectTarget :: HscTarget
461 | cGhcWithNativeCodeGen == "YES" = HscAsm
466 | Wrapped (Maybe String)
470 initDynFlags :: DynFlags -> IO DynFlags
471 initDynFlags dflags = do
472 -- someday these will be dynamic flags
473 ways <- readIORef v_Ways
474 build_tag <- readIORef v_Build_tag
475 rts_build_tag <- readIORef v_RTS_Build_tag
478 buildTag = build_tag,
479 rtsBuildTag = rts_build_tag
482 defaultDynFlags :: DynFlags
485 ghcMode = CompManager,
486 ghcLink = LinkBinary,
489 hscTarget = defaultHscTarget,
495 maxSimplIterations = 4,
496 shouldDumpSimplPhase = const False,
498 specConstrThreshold = Just 200,
499 liberateCaseThreshold = Just 200,
501 cmdlineHcIncludes = [],
505 ctxtStkDepth = mAX_CONTEXT_REDUCTION_DEPTH,
507 thisPackage = mainPackageId,
513 objectSuf = phaseInputExt StopLn,
514 hcSuf = phaseInputExt HCc,
517 outputFile = Nothing,
519 dynLibLoader = Deployable,
520 dumpPrefix = Nothing,
521 dumpPrefixForce = Nothing,
525 cmdlineFrameworks = [],
526 tmpDir = cDEFAULT_TMPDIR,
544 pkgDatabase = Nothing,
545 pkgState = panic "no package state yet: call GHC.setSessionDynFlags",
546 haddockOptions = Nothing,
548 Opt_ReadUserPackageConf,
550 Opt_MonoPatBinds, -- Experimentally, I'm making this non-standard
551 -- behaviour the default, to see if anyone notices
555 Opt_MonomorphismRestriction,
561 Opt_PrintBindContents
563 ++ [f | (ns,f) <- optLevelFlags, 0 `elem` ns]
564 -- The default -O0 options
567 log_action = \severity srcSpan style msg ->
569 SevInfo -> hPutStrLn stderr (show (msg style))
570 SevFatal -> hPutStrLn stderr (show (msg style))
571 _ -> hPutStrLn stderr ('\n':show ((mkLocMessage srcSpan msg) style))
577 0 | print errors & warnings only
578 1 | minimal verbosity: print "compiling M ... done." for each module.
579 2 | equivalent to -dshow-passes
580 3 | equivalent to existing "ghc -v"
581 4 | "ghc -v -ddump-most"
582 5 | "ghc -v -ddump-all"
585 dopt :: DynFlag -> DynFlags -> Bool
586 dopt f dflags = f `elem` (flags dflags)
588 dopt_set :: DynFlags -> DynFlag -> DynFlags
589 dopt_set dfs f = dfs{ flags = f : flags dfs }
591 dopt_unset :: DynFlags -> DynFlag -> DynFlags
592 dopt_unset dfs f = dfs{ flags = filter (/= f) (flags dfs) }
594 getOpts :: DynFlags -> (DynFlags -> [a]) -> [a]
595 getOpts dflags opts = reverse (opts dflags)
596 -- We add to the options from the front, so we need to reverse the list
598 getVerbFlag :: DynFlags -> String
600 | verbosity dflags >= 3 = "-v"
603 setObjectDir, setHiDir, setStubDir, setObjectSuf, setHiSuf, setHcSuf, parseDynLibLoaderMode,
604 setPgmP, setPgmL, setPgmF, setPgmc, setPgmm, setPgms, setPgma, setPgml, setPgmdll, setPgmwindres,
605 addOptL, addOptP, addOptF, addOptc, addOptm, addOpta, addOptl, addOptdep, addOptwindres,
606 addCmdlineFramework, addHaddockOpts
607 :: String -> DynFlags -> DynFlags
608 setOutputFile, setOutputHi, setDumpPrefixForce
609 :: Maybe String -> DynFlags -> DynFlags
611 setObjectDir f d = d{ objectDir = Just f}
612 setHiDir f d = d{ hiDir = Just f}
613 setStubDir f d = d{ stubDir = Just f, includePaths = f : includePaths d }
614 -- -stubdir D adds an implicit -I D, so that gcc can find the _stub.h file
615 -- #included from the .hc file when compiling with -fvia-C.
617 setObjectSuf f d = d{ objectSuf = f}
618 setHiSuf f d = d{ hiSuf = f}
619 setHcSuf f d = d{ hcSuf = f}
621 setOutputFile f d = d{ outputFile = f}
622 setOutputHi f d = d{ outputHi = f}
624 parseDynLibLoaderMode f d =
626 ("deploy", "") -> d{ dynLibLoader = Deployable }
627 ("sysdep", "") -> d{ dynLibLoader = SystemDependent }
628 ("wrapped", "") -> d{ dynLibLoader = Wrapped Nothing }
629 ("wrapped:", "hard") -> d{ dynLibLoader = Wrapped Nothing }
630 ("wrapped:", flex) -> d{ dynLibLoader = Wrapped (Just flex) }
631 (_,_) -> error "Unknown dynlib loader"
633 setDumpPrefixForce f d = d { dumpPrefixForce = f}
635 -- XXX HACK: Prelude> words "'does not' work" ===> ["'does","not'","work"]
636 -- Config.hs should really use Option.
637 setPgmP f d = let (pgm:args) = words f in d{ pgm_P = (pgm, map Option args)}
639 setPgmL f d = d{ pgm_L = f}
640 setPgmF f d = d{ pgm_F = f}
641 setPgmc f d = d{ pgm_c = (f,[])}
642 setPgmm f d = d{ pgm_m = (f,[])}
643 setPgms f d = d{ pgm_s = (f,[])}
644 setPgma f d = d{ pgm_a = (f,[])}
645 setPgml f d = d{ pgm_l = (f,[])}
646 setPgmdll f d = d{ pgm_dll = (f,[])}
647 setPgmwindres f d = d{ pgm_windres = f}
649 addOptL f d = d{ opt_L = f : opt_L d}
650 addOptP f d = d{ opt_P = f : opt_P d}
651 addOptF f d = d{ opt_F = f : opt_F d}
652 addOptc f d = d{ opt_c = f : opt_c d}
653 addOptm f d = d{ opt_m = f : opt_m d}
654 addOpta f d = d{ opt_a = f : opt_a d}
655 addOptl f d = d{ opt_l = f : opt_l d}
656 addOptdep f d = d{ opt_dep = f : opt_dep d}
657 addOptwindres f d = d{ opt_windres = f : opt_windres d}
659 addCmdlineFramework f d = d{ cmdlineFrameworks = f : cmdlineFrameworks d}
661 addHaddockOpts f d = d{ haddockOptions = Just f}
663 -- -----------------------------------------------------------------------------
664 -- Command-line options
666 -- When invoking external tools as part of the compilation pipeline, we
667 -- pass these a sequence of options on the command-line. Rather than
668 -- just using a list of Strings, we use a type that allows us to distinguish
669 -- between filepaths and 'other stuff'. [The reason being, of course, that
670 -- this type gives us a handle on transforming filenames, and filenames only,
671 -- to whatever format they're expected to be on a particular platform.]
674 = FileOption -- an entry that _contains_ filename(s) / filepaths.
675 String -- a non-filepath prefix that shouldn't be
676 -- transformed (e.g., "/out=")
677 String -- the filepath/filename portion
680 -----------------------------------------------------------------------------
681 -- Setting the optimisation level
683 updOptLevel :: Int -> DynFlags -> DynFlags
684 -- Set dynflags appropriate to the optimisation level
686 = dfs2{ optLevel = final_n }
688 final_n = max 0 (min 2 n) -- Clamp to 0 <= n <= 2
689 dfs1 = foldr (flip dopt_unset) dfs remove_dopts
690 dfs2 = foldr (flip dopt_set) dfs1 extra_dopts
692 extra_dopts = [ f | (ns,f) <- optLevelFlags, final_n `elem` ns ]
693 remove_dopts = [ f | (ns,f) <- optLevelFlags, final_n `notElem` ns ]
695 optLevelFlags :: [([Int], DynFlag)]
697 = [ ([0], Opt_IgnoreInterfacePragmas)
698 , ([0], Opt_OmitInterfacePragmas)
700 , ([1,2], Opt_IgnoreAsserts)
701 , ([1,2], Opt_RewriteRules) -- Off for -O0; see Note [Scoping for Builtin rules]
703 , ([1,2], Opt_DoEtaReduction)
704 , ([1,2], Opt_CaseMerge)
705 , ([1,2], Opt_Strictness)
707 , ([1,2], Opt_FullLaziness)
709 , ([2], Opt_LiberateCase)
710 , ([2], Opt_SpecConstr)
712 , ([0,1,2], Opt_DoLambdaEtaExpansion)
713 -- This one is important for a tiresome reason:
714 -- we want to make sure that the bindings for data
715 -- constructors are eta-expanded. This is probably
716 -- a good thing anyway, but it seems fragile.
719 -- -----------------------------------------------------------------------------
720 -- Standard sets of warning options
722 standardWarnings :: [DynFlag]
724 = [ Opt_WarnDeprecations,
725 Opt_WarnOverlappingPatterns,
726 Opt_WarnMissingFields,
727 Opt_WarnMissingMethods,
728 Opt_WarnDuplicateExports
731 minusWOpts :: [DynFlag]
733 = standardWarnings ++
734 [ Opt_WarnUnusedBinds,
735 Opt_WarnUnusedMatches,
736 Opt_WarnUnusedImports,
737 Opt_WarnIncompletePatterns,
741 minusWallOpts :: [DynFlag]
744 [ Opt_WarnTypeDefaults,
745 Opt_WarnNameShadowing,
751 -- minuswRemovesOpts should be every warning option
752 minuswRemovesOpts :: [DynFlag]
755 [Opt_WarnImplicitPrelude,
756 Opt_WarnIncompletePatternsRecUpd,
757 Opt_WarnSimplePatterns,
758 Opt_WarnMonomorphism,
762 -- -----------------------------------------------------------------------------
763 -- CoreToDo: abstraction of core-to-core passes to run.
765 data CoreToDo -- These are diff core-to-core passes,
766 -- which may be invoked in any order,
767 -- as many times as you like.
769 = CoreDoSimplify -- The core-to-core simplifier.
772 -- Each run of the simplifier can take a different
773 -- set of simplifier-specific flags.
775 | CoreDoFloatOutwards FloatOutSwitches
780 | CoreDoWorkerWrapper
783 | CoreDoOldStrictness
786 | CoreDoRuleCheck Int{-CompilerPhase-} String -- Check for non-application of rules
787 -- matching this string
788 | CoreDoVectorisation
789 | CoreDoNothing -- Useful when building up
790 | CoreDoPasses [CoreToDo] -- lists of these things
792 data SimplifierMode -- See comments in SimplMonad
796 data SimplifierSwitch
797 = MaxSimplifierIterations Int
800 data FloatOutSwitches
801 = FloatOutSw Bool -- True <=> float lambdas to top level
802 Bool -- True <=> float constants to top level,
803 -- even if they do not escape a lambda
806 -- The core-to-core pass ordering is derived from the DynFlags:
807 runWhen :: Bool -> CoreToDo -> CoreToDo
808 runWhen True do_this = do_this
809 runWhen False _ = CoreDoNothing
811 runMaybe :: Maybe a -> (a -> CoreToDo) -> CoreToDo
812 runMaybe (Just x) f = f x
813 runMaybe Nothing _ = CoreDoNothing
815 getCoreToDo :: DynFlags -> [CoreToDo]
817 | Just todo <- coreToDo dflags = todo -- set explicitly by user
818 | otherwise = core_todo
820 opt_level = optLevel dflags
821 phases = simplPhases dflags
822 max_iter = maxSimplIterations dflags
823 strictness = dopt Opt_Strictness dflags
824 full_laziness = dopt Opt_FullLaziness dflags
825 cse = dopt Opt_CSE dflags
826 spec_constr = dopt Opt_SpecConstr dflags
827 liberate_case = dopt Opt_LiberateCase dflags
828 rule_check = ruleCheck dflags
829 vectorisation = dopt Opt_Vectorise dflags
831 maybe_rule_check phase = runMaybe rule_check (CoreDoRuleCheck phase)
833 simpl_phase phase iter = CoreDoPasses
834 [ CoreDoSimplify (SimplPhase phase) [
835 MaxSimplifierIterations iter
837 maybe_rule_check phase
840 -- By default, we have 2 phases before phase 0.
842 -- Want to run with inline phase 2 after the specialiser to give
843 -- maximum chance for fusion to work before we inline build/augment
844 -- in phase 1. This made a difference in 'ansi' where an
845 -- overloaded function wasn't inlined till too late.
847 -- Need phase 1 so that build/augment get
848 -- inlined. I found that spectral/hartel/genfft lost some useful
849 -- strictness in the function sumcode' if augment is not inlined
850 -- before strictness analysis runs
851 simpl_phases = CoreDoPasses [ simpl_phase phase max_iter
852 | phase <- [phases, phases-1 .. 1] ]
855 -- initial simplify: mk specialiser happy: minimum effort please
856 simpl_gently = CoreDoSimplify SimplGently [
858 -- Don't inline anything till full laziness has bitten
859 -- In particular, inlining wrappers inhibits floating
860 -- e.g. ...(case f x of ...)...
861 -- ==> ...(case (case x of I# x# -> fw x#) of ...)...
862 -- ==> ...(case x of I# x# -> case fw x# of ...)...
863 -- and now the redex (f x) isn't floatable any more
864 -- Similarly, don't apply any rules until after full
865 -- laziness. Notably, list fusion can prevent floating.
867 NoCaseOfCase, -- Don't do case-of-case transformations.
868 -- This makes full laziness work better
869 MaxSimplifierIterations max_iter
873 if opt_level == 0 then
874 [simpl_phase 0 max_iter]
875 else {- opt_level >= 1 -} [
877 -- initial simplify: mk specialiser happy: minimum effort please
880 -- We run vectorisation here for now, but we might also try to run
882 runWhen vectorisation (CoreDoPasses [ CoreDoVectorisation, simpl_gently ]),
884 -- Specialisation is best done before full laziness
885 -- so that overloaded functions have all their dictionary lambdas manifest
888 runWhen full_laziness (CoreDoFloatOutwards (FloatOutSw False False)),
894 -- Phase 0: allow all Ids to be inlined now
895 -- This gets foldr inlined before strictness analysis
897 -- At least 3 iterations because otherwise we land up with
898 -- huge dead expressions because of an infelicity in the
900 -- let k = BIG in foldr k z xs
901 -- ==> let k = BIG in letrec go = \xs -> ...(k x).... in go xs
902 -- ==> let k = BIG in letrec go = \xs -> ...(BIG x).... in go xs
904 simpl_phase 0 (max max_iter 3),
907 #ifdef OLD_STRICTNESS
910 runWhen strictness (CoreDoPasses [
914 simpl_phase 0 max_iter
917 runWhen full_laziness
918 (CoreDoFloatOutwards (FloatOutSw False -- Not lambdas
919 True)), -- Float constants
920 -- nofib/spectral/hartel/wang doubles in speed if you
921 -- do full laziness late in the day. It only happens
922 -- after fusion and other stuff, so the early pass doesn't
923 -- catch it. For the record, the redex is
924 -- f_el22 (f_el21 r_midblock)
928 -- We want CSE to follow the final full-laziness pass, because it may
929 -- succeed in commoning up things floated out by full laziness.
930 -- CSE used to rely on the no-shadowing invariant, but it doesn't any more
936 -- Case-liberation for -O2. This should be after
937 -- strictness analysis and the simplification which follows it.
938 runWhen liberate_case (CoreDoPasses [
940 simpl_phase 0 max_iter
941 ]), -- Run the simplifier after LiberateCase to vastly
942 -- reduce the possiblility of shadowing
943 -- Reason: see Note [Shadowing] in SpecConstr.lhs
945 runWhen spec_constr CoreDoSpecConstr,
949 -- Final clean-up simplification:
950 simpl_phase 0 max_iter
953 -- -----------------------------------------------------------------------------
954 -- StgToDo: abstraction of stg-to-stg passes to run.
957 = StgDoMassageForProfiling -- should be (next to) last
958 -- There's also setStgVarInfo, but its absolute "lastness"
959 -- is so critical that it is hardwired in (no flag).
962 getStgToDo :: DynFlags -> [StgToDo]
964 | Just todo <- stgToDo dflags = todo -- set explicitly by user
967 stg_stats = dopt Opt_StgStats dflags
969 todo1 = if stg_stats then [D_stg_stats] else []
971 todo2 | WayProf `elem` wayNames dflags
972 = StgDoMassageForProfiling : todo1
976 -- -----------------------------------------------------------------------------
980 allFlags = map ('-':) $
981 [ name | (name, optkind) <- dynamic_flags, ok optkind ] ++
982 map ("fno-"++) flags ++
986 where ok (PrefixPred _ _) = False
988 flags = map fst fFlags
991 dynamic_flags :: [(String, OptKind DynP)]
993 ( "n" , NoArg (setDynFlag Opt_DryRun) )
994 , ( "cpp" , NoArg (setDynFlag Opt_Cpp))
995 , ( "F" , NoArg (setDynFlag Opt_Pp))
996 , ( "#include" , HasArg (addCmdlineHCInclude) )
997 , ( "v" , OptIntSuffix setVerbosity )
999 ------- Specific phases --------------------------------------------
1000 , ( "pgmL" , HasArg (upd . setPgmL) )
1001 , ( "pgmP" , HasArg (upd . setPgmP) )
1002 , ( "pgmF" , HasArg (upd . setPgmF) )
1003 , ( "pgmc" , HasArg (upd . setPgmc) )
1004 , ( "pgmm" , HasArg (upd . setPgmm) )
1005 , ( "pgms" , HasArg (upd . setPgms) )
1006 , ( "pgma" , HasArg (upd . setPgma) )
1007 , ( "pgml" , HasArg (upd . setPgml) )
1008 , ( "pgmdll" , HasArg (upd . setPgmdll) )
1009 , ( "pgmwindres" , HasArg (upd . setPgmwindres) )
1011 , ( "optL" , HasArg (upd . addOptL) )
1012 , ( "optP" , HasArg (upd . addOptP) )
1013 , ( "optF" , HasArg (upd . addOptF) )
1014 , ( "optc" , HasArg (upd . addOptc) )
1015 , ( "optm" , HasArg (upd . addOptm) )
1016 , ( "opta" , HasArg (upd . addOpta) )
1017 , ( "optl" , HasArg (upd . addOptl) )
1018 , ( "optdep" , HasArg (upd . addOptdep) )
1019 , ( "optwindres" , HasArg (upd . addOptwindres) )
1021 , ( "split-objs" , NoArg (if can_split
1022 then setDynFlag Opt_SplitObjs
1025 -------- Linking ----------------------------------------------------
1026 , ( "c" , NoArg (upd $ \d -> d{ ghcLink=NoLink } ))
1027 , ( "no-link" , NoArg (upd $ \d -> d{ ghcLink=NoLink } )) -- Dep.
1028 , ( "shared" , NoArg (upd $ \d -> d{ ghcLink=LinkDynLib } ))
1029 , ( "dynload" , HasArg (upd . parseDynLibLoaderMode))
1031 ------- Libraries ---------------------------------------------------
1032 , ( "L" , Prefix addLibraryPath )
1033 , ( "l" , AnySuffix (\s -> do upd (addOptl s)))
1035 ------- Frameworks --------------------------------------------------
1036 -- -framework-path should really be -F ...
1037 , ( "framework-path" , HasArg addFrameworkPath )
1038 , ( "framework" , HasArg (upd . addCmdlineFramework) )
1040 ------- Output Redirection ------------------------------------------
1041 , ( "odir" , HasArg (upd . setObjectDir))
1042 , ( "o" , SepArg (upd . setOutputFile . Just))
1043 , ( "ohi" , HasArg (upd . setOutputHi . Just ))
1044 , ( "osuf" , HasArg (upd . setObjectSuf))
1045 , ( "hcsuf" , HasArg (upd . setHcSuf))
1046 , ( "hisuf" , HasArg (upd . setHiSuf))
1047 , ( "hidir" , HasArg (upd . setHiDir))
1048 , ( "tmpdir" , HasArg (upd . setTmpDir))
1049 , ( "stubdir" , HasArg (upd . setStubDir))
1050 , ( "ddump-file-prefix", HasArg (upd . setDumpPrefixForce . Just))
1052 ------- Keeping temporary files -------------------------------------
1053 -- These can be singular (think ghc -c) or plural (think ghc --make)
1054 , ( "keep-hc-file" , NoArg (setDynFlag Opt_KeepHcFiles))
1055 , ( "keep-hc-files" , NoArg (setDynFlag Opt_KeepHcFiles))
1056 , ( "keep-s-file" , NoArg (setDynFlag Opt_KeepSFiles))
1057 , ( "keep-s-files" , NoArg (setDynFlag Opt_KeepSFiles))
1058 , ( "keep-raw-s-file" , NoArg (setDynFlag Opt_KeepRawSFiles))
1059 , ( "keep-raw-s-files", NoArg (setDynFlag Opt_KeepRawSFiles))
1060 -- This only makes sense as plural
1061 , ( "keep-tmp-files" , NoArg (setDynFlag Opt_KeepTmpFiles))
1063 ------- Miscellaneous ----------------------------------------------
1064 , ( "no-hs-main" , NoArg (setDynFlag Opt_NoHsMain))
1065 , ( "main-is" , SepArg setMainIs )
1066 , ( "haddock" , NoArg (setDynFlag Opt_Haddock) )
1067 , ( "haddock-opts" , HasArg (upd . addHaddockOpts))
1068 , ( "hpcdir" , SepArg setOptHpcDir )
1070 ------- recompilation checker (DEPRECATED, use -fforce-recomp) -----
1071 , ( "recomp" , NoArg (unSetDynFlag Opt_ForceRecomp) )
1072 , ( "no-recomp" , NoArg (setDynFlag Opt_ForceRecomp) )
1074 ------- Packages ----------------------------------------------------
1075 , ( "package-conf" , HasArg extraPkgConf_ )
1076 , ( "no-user-package-conf", NoArg (unSetDynFlag Opt_ReadUserPackageConf) )
1077 , ( "package-name" , HasArg (upd . setPackageName) )
1078 , ( "package" , HasArg exposePackage )
1079 , ( "hide-package" , HasArg hidePackage )
1080 , ( "hide-all-packages", NoArg (setDynFlag Opt_HideAllPackages) )
1081 , ( "ignore-package" , HasArg ignorePackage )
1082 , ( "syslib" , HasArg exposePackage ) -- for compatibility
1084 ------ HsCpp opts ---------------------------------------------------
1085 , ( "D", AnySuffix (upd . addOptP) )
1086 , ( "U", AnySuffix (upd . addOptP) )
1088 ------- Include/Import Paths ----------------------------------------
1089 , ( "I" , Prefix addIncludePath)
1090 , ( "i" , OptPrefix addImportPath )
1092 ------ Debugging ----------------------------------------------------
1093 , ( "dstg-stats", NoArg (setDynFlag Opt_StgStats))
1095 , ( "ddump-cmm", setDumpFlag Opt_D_dump_cmm)
1096 , ( "ddump-cmmz", setDumpFlag Opt_D_dump_cmmz)
1097 , ( "ddump-cmmz-pretty", setDumpFlag Opt_D_dump_cmmz_pretty)
1098 , ( "ddump-cps-cmm", setDumpFlag Opt_D_dump_cps_cmm)
1099 , ( "ddump-cvt-cmm", setDumpFlag Opt_D_dump_cvt_cmm)
1100 , ( "ddump-asm", setDumpFlag Opt_D_dump_asm)
1101 , ( "ddump-asm-native", setDumpFlag Opt_D_dump_asm_native)
1102 , ( "ddump-asm-liveness", setDumpFlag Opt_D_dump_asm_liveness)
1103 , ( "ddump-asm-coalesce", setDumpFlag Opt_D_dump_asm_coalesce)
1104 , ( "ddump-asm-regalloc", setDumpFlag Opt_D_dump_asm_regalloc)
1105 , ( "ddump-asm-conflicts", setDumpFlag Opt_D_dump_asm_conflicts)
1106 , ( "ddump-asm-regalloc-stages",
1107 setDumpFlag Opt_D_dump_asm_regalloc_stages)
1108 , ( "ddump-asm-stats", setDumpFlag Opt_D_dump_asm_stats)
1109 , ( "ddump-cpranal", setDumpFlag Opt_D_dump_cpranal)
1110 , ( "ddump-deriv", setDumpFlag Opt_D_dump_deriv)
1111 , ( "ddump-ds", setDumpFlag Opt_D_dump_ds)
1112 , ( "ddump-flatC", setDumpFlag Opt_D_dump_flatC)
1113 , ( "ddump-foreign", setDumpFlag Opt_D_dump_foreign)
1114 , ( "ddump-inlinings", setDumpFlag Opt_D_dump_inlinings)
1115 , ( "ddump-rule-firings", setDumpFlag Opt_D_dump_rule_firings)
1116 , ( "ddump-occur-anal", setDumpFlag Opt_D_dump_occur_anal)
1117 , ( "ddump-parsed", setDumpFlag Opt_D_dump_parsed)
1118 , ( "ddump-rn", setDumpFlag Opt_D_dump_rn)
1119 , ( "ddump-simpl", setDumpFlag Opt_D_dump_simpl)
1120 , ( "ddump-simpl-iterations", setDumpFlag Opt_D_dump_simpl_iterations)
1121 , ( "ddump-simpl-phases", OptPrefix setDumpSimplPhases)
1122 , ( "ddump-spec", setDumpFlag Opt_D_dump_spec)
1123 , ( "ddump-prep", setDumpFlag Opt_D_dump_prep)
1124 , ( "ddump-stg", setDumpFlag Opt_D_dump_stg)
1125 , ( "ddump-stranal", setDumpFlag Opt_D_dump_stranal)
1126 , ( "ddump-tc", setDumpFlag Opt_D_dump_tc)
1127 , ( "ddump-types", setDumpFlag Opt_D_dump_types)
1128 , ( "ddump-rules", setDumpFlag Opt_D_dump_rules)
1129 , ( "ddump-cse", setDumpFlag Opt_D_dump_cse)
1130 , ( "ddump-worker-wrapper", setDumpFlag Opt_D_dump_worker_wrapper)
1131 , ( "ddump-rn-trace", setDumpFlag Opt_D_dump_rn_trace)
1132 , ( "ddump-if-trace", setDumpFlag Opt_D_dump_if_trace)
1133 , ( "ddump-tc-trace", setDumpFlag Opt_D_dump_tc_trace)
1134 , ( "ddump-splices", setDumpFlag Opt_D_dump_splices)
1135 , ( "ddump-rn-stats", setDumpFlag Opt_D_dump_rn_stats)
1136 , ( "ddump-opt-cmm", setDumpFlag Opt_D_dump_opt_cmm)
1137 , ( "ddump-simpl-stats", setDumpFlag Opt_D_dump_simpl_stats)
1138 , ( "ddump-bcos", setDumpFlag Opt_D_dump_BCOs)
1139 , ( "dsource-stats", setDumpFlag Opt_D_source_stats)
1140 , ( "dverbose-core2core", NoArg setVerboseCore2Core)
1141 , ( "dverbose-stg2stg", setDumpFlag Opt_D_verbose_stg2stg)
1142 , ( "ddump-hi", setDumpFlag Opt_D_dump_hi)
1143 , ( "ddump-minimal-imports", setDumpFlag Opt_D_dump_minimal_imports)
1144 , ( "ddump-vect", setDumpFlag Opt_D_dump_vect)
1145 , ( "ddump-hpc", setDumpFlag Opt_D_dump_hpc)
1146 , ( "ddump-mod-cycles", setDumpFlag Opt_D_dump_mod_cycles)
1147 , ( "ddump-view-pattern-commoning", setDumpFlag Opt_D_dump_view_pattern_commoning)
1148 , ( "ddump-to-file", setDumpFlag Opt_DumpToFile)
1149 , ( "ddump-hi-diffs", NoArg (setDynFlag Opt_D_dump_hi_diffs))
1150 , ( "dcore-lint", NoArg (setDynFlag Opt_DoCoreLinting))
1151 , ( "dstg-lint", NoArg (setDynFlag Opt_DoStgLinting))
1152 , ( "dcmm-lint", NoArg (setDynFlag Opt_DoCmmLinting))
1153 , ( "dasm-lint", NoArg (setDynFlag Opt_DoAsmLinting))
1154 , ( "dshow-passes", NoArg (do setDynFlag Opt_ForceRecomp
1155 setVerbosity (Just 2)) )
1156 , ( "dfaststring-stats", NoArg (setDynFlag Opt_D_faststring_stats))
1158 ------ Machine dependant (-m<blah>) stuff ---------------------------
1160 , ( "monly-2-regs", NoArg (upd (\s -> s{stolen_x86_regs = 2}) ))
1161 , ( "monly-3-regs", NoArg (upd (\s -> s{stolen_x86_regs = 3}) ))
1162 , ( "monly-4-regs", NoArg (upd (\s -> s{stolen_x86_regs = 4}) ))
1164 ------ Warning opts -------------------------------------------------
1165 , ( "W" , NoArg (mapM_ setDynFlag minusWOpts) )
1166 , ( "Werror", NoArg (setDynFlag Opt_WarnIsError) )
1167 , ( "Wwarn" , NoArg (unSetDynFlag Opt_WarnIsError) )
1168 , ( "Wall" , NoArg (mapM_ setDynFlag minusWallOpts) )
1169 , ( "Wnot" , NoArg (mapM_ unSetDynFlag minusWallOpts) ) -- DEPRECATED
1170 , ( "w" , NoArg (mapM_ unSetDynFlag minuswRemovesOpts) )
1172 ------ Optimisation flags ------------------------------------------
1173 , ( "O" , NoArg (upd (setOptLevel 1)))
1174 , ( "Onot" , NoArg (upd (setOptLevel 0))) -- deprecated
1175 , ( "O" , OptIntSuffix (\mb_n -> upd (setOptLevel (mb_n `orElse` 1))))
1176 -- If the number is missing, use 1
1178 , ( "fsimplifier-phases", IntSuffix (\n ->
1179 upd (\dfs -> dfs{ simplPhases = n })) )
1180 , ( "fmax-simplifier-iterations", IntSuffix (\n ->
1181 upd (\dfs -> dfs{ maxSimplIterations = n })) )
1183 , ( "fspec-constr-threshold", IntSuffix (\n ->
1184 upd (\dfs -> dfs{ specConstrThreshold = Just n })))
1185 , ( "fno-spec-constr-threshold", NoArg (
1186 upd (\dfs -> dfs{ specConstrThreshold = Nothing })))
1187 , ( "fliberate-case-threshold", IntSuffix (\n ->
1188 upd (\dfs -> dfs{ liberateCaseThreshold = Just n })))
1189 , ( "fno-liberate-case-threshold", NoArg (
1190 upd (\dfs -> dfs{ liberateCaseThreshold = Nothing })))
1192 , ( "frule-check", SepArg (\s -> upd (\dfs -> dfs{ ruleCheck = Just s })))
1193 , ( "fcontext-stack" , IntSuffix $ \n -> upd $ \dfs -> dfs{ ctxtStkDepth = n })
1195 ------ Compiler flags -----------------------------------------------
1197 , ( "fasm", NoArg (setObjTarget HscAsm) )
1198 , ( "fvia-c", NoArg (setObjTarget HscC) )
1199 , ( "fvia-C", NoArg (setObjTarget HscC) )
1201 , ( "fno-code", NoArg (setTarget HscNothing))
1202 , ( "fbyte-code", NoArg (setTarget HscInterpreted) )
1203 , ( "fobject-code", NoArg (setTarget defaultHscTarget) )
1205 , ( "fglasgow-exts", NoArg (mapM_ setDynFlag glasgowExtsFlags) )
1206 , ( "fno-glasgow-exts", NoArg (mapM_ unSetDynFlag glasgowExtsFlags) )
1208 -- the rest of the -f* and -fno-* flags
1209 , ( "f", PrefixPred (isFlag fFlags)
1210 (\f -> setDynFlag (getFlag fFlags f)) )
1211 , ( "f", PrefixPred (isPrefFlag "no-" fFlags)
1212 (\f -> unSetDynFlag (getPrefFlag "no-" fFlags f)) )
1214 -- the -X* and -XNo* flags
1215 , ( "X", PrefixPred (isFlag xFlags)
1216 (\f -> setDynFlag (getFlag xFlags f)) )
1217 , ( "X", PrefixPred (isPrefFlag "No" xFlags)
1218 (\f -> unSetDynFlag (getPrefFlag "No" xFlags f)) )
1221 -- these -f<blah> flags can all be reversed with -fno-<blah>
1223 fFlags :: [(String, DynFlag)]
1225 ( "warn-dodgy-imports", Opt_WarnDodgyImports ),
1226 ( "warn-duplicate-exports", Opt_WarnDuplicateExports ),
1227 ( "warn-hi-shadowing", Opt_WarnHiShadows ),
1228 ( "warn-implicit-prelude", Opt_WarnImplicitPrelude ),
1229 ( "warn-incomplete-patterns", Opt_WarnIncompletePatterns ),
1230 ( "warn-incomplete-record-updates", Opt_WarnIncompletePatternsRecUpd ),
1231 ( "warn-missing-fields", Opt_WarnMissingFields ),
1232 ( "warn-missing-methods", Opt_WarnMissingMethods ),
1233 ( "warn-missing-signatures", Opt_WarnMissingSigs ),
1234 ( "warn-name-shadowing", Opt_WarnNameShadowing ),
1235 ( "warn-overlapping-patterns", Opt_WarnOverlappingPatterns ),
1236 ( "warn-simple-patterns", Opt_WarnSimplePatterns ),
1237 ( "warn-type-defaults", Opt_WarnTypeDefaults ),
1238 ( "warn-monomorphism-restriction", Opt_WarnMonomorphism ),
1239 ( "warn-unused-binds", Opt_WarnUnusedBinds ),
1240 ( "warn-unused-imports", Opt_WarnUnusedImports ),
1241 ( "warn-unused-matches", Opt_WarnUnusedMatches ),
1242 ( "warn-deprecations", Opt_WarnDeprecations ),
1243 ( "warn-orphans", Opt_WarnOrphans ),
1244 ( "warn-tabs", Opt_WarnTabs ),
1245 ( "print-explicit-foralls", Opt_PrintExplicitForalls ),
1246 ( "strictness", Opt_Strictness ),
1247 ( "full-laziness", Opt_FullLaziness ),
1248 ( "liberate-case", Opt_LiberateCase ),
1249 ( "spec-constr", Opt_SpecConstr ),
1251 ( "ignore-interface-pragmas", Opt_IgnoreInterfacePragmas ),
1252 ( "omit-interface-pragmas", Opt_OmitInterfacePragmas ),
1253 ( "do-lambda-eta-expansion", Opt_DoLambdaEtaExpansion ),
1254 ( "ignore-asserts", Opt_IgnoreAsserts ),
1255 ( "do-eta-reduction", Opt_DoEtaReduction ),
1256 ( "case-merge", Opt_CaseMerge ),
1257 ( "unbox-strict-fields", Opt_UnboxStrictFields ),
1258 ( "dicts-cheap", Opt_DictsCheap ),
1259 ( "excess-precision", Opt_ExcessPrecision ),
1260 ( "asm-mangling", Opt_DoAsmMangling ),
1261 ( "print-bind-result", Opt_PrintBindResult ),
1262 ( "force-recomp", Opt_ForceRecomp ),
1263 ( "hpc-no-auto", Opt_Hpc_No_Auto ),
1264 ( "rewrite-rules", Opt_RewriteRules ),
1265 ( "break-on-exception", Opt_BreakOnException ),
1266 ( "break-on-error", Opt_BreakOnError ),
1267 ( "print-evld-with-show", Opt_PrintEvldWithShow ),
1268 ( "print-bind-contents", Opt_PrintBindContents ),
1269 ( "run-cps", Opt_RunCPSZ ),
1270 ( "convert-to-zipper-and-back", Opt_ConvertToZipCfgAndBack),
1271 ( "vectorise", Opt_Vectorise ),
1272 ( "regs-graph", Opt_RegsGraph),
1273 ( "regs-iterative", Opt_RegsIterative),
1274 -- Deprecated in favour of -XTemplateHaskell:
1275 ( "th", Opt_TemplateHaskell ),
1276 -- Deprecated in favour of -XForeignFunctionInterface:
1277 ( "fi", Opt_ForeignFunctionInterface ),
1278 -- Deprecated in favour of -XForeignFunctionInterface:
1279 ( "ffi", Opt_ForeignFunctionInterface ),
1280 -- Deprecated in favour of -XArrows:
1281 ( "arrows", Opt_Arrows ),
1282 -- Deprecated in favour of -XGenerics:
1283 ( "generics", Opt_Generics ),
1284 -- Deprecated in favour of -XImplicitPrelude:
1285 ( "implicit-prelude", Opt_ImplicitPrelude ),
1286 -- Deprecated in favour of -XBangPatterns:
1287 ( "bang-patterns", Opt_BangPatterns ),
1288 -- Deprecated in favour of -XMonomorphismRestriction:
1289 ( "monomorphism-restriction", Opt_MonomorphismRestriction ),
1290 -- Deprecated in favour of -XMonoPatBinds:
1291 ( "mono-pat-binds", Opt_MonoPatBinds ),
1292 -- Deprecated in favour of -XExtendedDefaultRules:
1293 ( "extended-default-rules", Opt_ExtendedDefaultRules ),
1294 -- Deprecated in favour of -XImplicitParams:
1295 ( "implicit-params", Opt_ImplicitParams ),
1296 -- Deprecated in favour of -XScopedTypeVariables:
1297 ( "scoped-type-variables", Opt_ScopedTypeVariables ),
1298 -- Deprecated in favour of -XPArr:
1299 ( "parr", Opt_PArr ),
1300 -- Deprecated in favour of -XOverlappingInstances:
1301 ( "allow-overlapping-instances", Opt_OverlappingInstances ),
1302 -- Deprecated in favour of -XUndecidableInstances:
1303 ( "allow-undecidable-instances", Opt_UndecidableInstances ),
1304 -- Deprecated in favour of -XIncoherentInstances:
1305 ( "allow-incoherent-instances", Opt_IncoherentInstances ),
1306 ( "gen-manifest", Opt_GenManifest ),
1307 ( "embed-manifest", Opt_EmbedManifest )
1310 supportedLanguages :: [String]
1311 supportedLanguages = map fst xFlags
1313 -- These -X<blah> flags can all be reversed with -XNo<blah>
1314 xFlags :: [(String, DynFlag)]
1317 ( "PatternGuards", Opt_PatternGuards ),
1318 ( "UnicodeSyntax", Opt_UnicodeSyntax ),
1319 ( "MagicHash", Opt_MagicHash ),
1320 ( "PolymorphicComponents", Opt_PolymorphicComponents ),
1321 ( "ExistentialQuantification", Opt_ExistentialQuantification ),
1322 ( "KindSignatures", Opt_KindSignatures ),
1323 ( "PatternSignatures", Opt_PatternSignatures ),
1324 ( "EmptyDataDecls", Opt_EmptyDataDecls ),
1325 ( "ParallelListComp", Opt_ParallelListComp ),
1326 ( "TransformListComp", Opt_TransformListComp ),
1327 ( "ForeignFunctionInterface", Opt_ForeignFunctionInterface ),
1328 ( "UnliftedFFITypes", Opt_UnliftedFFITypes ),
1329 ( "LiberalTypeSynonyms", Opt_LiberalTypeSynonyms ),
1330 ( "Rank2Types", Opt_Rank2Types ),
1331 ( "RankNTypes", Opt_RankNTypes ),
1332 ( "ImpredicativeTypes", Opt_ImpredicativeTypes ),
1333 ( "TypeOperators", Opt_TypeOperators ),
1334 ( "RecursiveDo", Opt_RecursiveDo ),
1335 ( "Arrows", Opt_Arrows ),
1336 ( "PArr", Opt_PArr ),
1337 ( "TemplateHaskell", Opt_TemplateHaskell ),
1338 ( "QuasiQuotes", Opt_QuasiQuotes ),
1339 ( "Generics", Opt_Generics ),
1341 ( "ImplicitPrelude", Opt_ImplicitPrelude ),
1342 ( "RecordWildCards", Opt_RecordWildCards ),
1343 ( "RecordPuns", Opt_RecordPuns ),
1344 ( "DisambiguateRecordFields", Opt_DisambiguateRecordFields ),
1345 ( "OverloadedStrings", Opt_OverloadedStrings ),
1346 ( "GADTs", Opt_GADTs ),
1347 ( "ViewPatterns", Opt_ViewPatterns),
1348 ( "TypeFamilies", Opt_TypeFamilies ),
1349 ( "BangPatterns", Opt_BangPatterns ),
1351 ( "MonomorphismRestriction", Opt_MonomorphismRestriction ),
1352 -- On by default (which is not strictly H98):
1353 ( "MonoPatBinds", Opt_MonoPatBinds ),
1354 ( "RelaxedPolyRec", Opt_RelaxedPolyRec),
1355 ( "ExtendedDefaultRules", Opt_ExtendedDefaultRules ),
1356 ( "ImplicitParams", Opt_ImplicitParams ),
1357 ( "ScopedTypeVariables", Opt_ScopedTypeVariables ),
1358 ( "UnboxedTuples", Opt_UnboxedTuples ),
1359 ( "StandaloneDeriving", Opt_StandaloneDeriving ),
1360 ( "DeriveDataTypeable", Opt_DeriveDataTypeable ),
1361 ( "TypeSynonymInstances", Opt_TypeSynonymInstances ),
1362 ( "FlexibleContexts", Opt_FlexibleContexts ),
1363 ( "FlexibleInstances", Opt_FlexibleInstances ),
1364 ( "ConstrainedClassMethods", Opt_ConstrainedClassMethods ),
1365 ( "MultiParamTypeClasses", Opt_MultiParamTypeClasses ),
1366 ( "FunctionalDependencies", Opt_FunctionalDependencies ),
1367 ( "GeneralizedNewtypeDeriving", Opt_GeneralizedNewtypeDeriving ),
1368 ( "OverlappingInstances", Opt_OverlappingInstances ),
1369 ( "UndecidableInstances", Opt_UndecidableInstances ),
1370 ( "IncoherentInstances", Opt_IncoherentInstances )
1373 impliedFlags :: [(DynFlag, [DynFlag])]
1375 ( Opt_GADTs, [Opt_RelaxedPolyRec] ) -- We want type-sig variables to
1376 -- be completely rigid for GADTs
1377 , ( Opt_ScopedTypeVariables, [Opt_RelaxedPolyRec] ) -- Ditto for scoped type variables; see
1378 -- Note [Scoped tyvars] in TcBinds
1381 glasgowExtsFlags :: [DynFlag]
1382 glasgowExtsFlags = [
1383 Opt_PrintExplicitForalls
1384 , Opt_ForeignFunctionInterface
1385 , Opt_UnliftedFFITypes
1387 , Opt_ImplicitParams
1388 , Opt_ScopedTypeVariables
1390 , Opt_TypeSynonymInstances
1391 , Opt_StandaloneDeriving
1392 , Opt_DeriveDataTypeable
1393 , Opt_FlexibleContexts
1394 , Opt_FlexibleInstances
1395 , Opt_ConstrainedClassMethods
1396 , Opt_MultiParamTypeClasses
1397 , Opt_FunctionalDependencies
1399 , Opt_PolymorphicComponents
1400 , Opt_ExistentialQuantification
1403 , Opt_LiberalTypeSynonyms
1405 , Opt_ImpredicativeTypes
1408 , Opt_ParallelListComp
1409 , Opt_EmptyDataDecls
1410 , Opt_KindSignatures
1411 , Opt_PatternSignatures
1412 , Opt_GeneralizedNewtypeDeriving
1413 , Opt_TypeFamilies ]
1416 isFlag :: [(String,a)] -> String -> Bool
1417 isFlag flags f = any (\(ff,_) -> ff == f) flags
1419 isPrefFlag :: String -> [(String,a)] -> String -> Bool
1420 isPrefFlag pref flags no_f
1421 | Just f <- maybePrefixMatch pref no_f = isFlag flags f
1425 getFlag :: [(String,a)] -> String -> a
1426 getFlag flags f = case [ opt | (ff, opt) <- flags, ff == f] of
1428 [] -> panic ("get_flag " ++ f)
1430 getPrefFlag :: String -> [(String,a)] -> String -> a
1431 getPrefFlag pref flags f = getFlag flags (fromJust (maybePrefixMatch pref f))
1432 -- We should only be passed flags which match the prefix
1434 -- -----------------------------------------------------------------------------
1435 -- Parsing the dynamic flags.
1437 parseDynamicFlags :: DynFlags -> [String] -> IO (DynFlags,[String])
1438 parseDynamicFlags dflags args = do
1439 let ((leftover,errs),dflags')
1440 = runCmdLine (processArgs dynamic_flags args) dflags
1441 when (not (null errs)) $ do
1442 throwDyn (UsageError (unlines errs))
1443 return (dflags', leftover)
1446 type DynP = CmdLineP DynFlags
1448 upd :: (DynFlags -> DynFlags) -> DynP ()
1450 dfs <- getCmdLineState
1451 putCmdLineState $! (f dfs)
1453 --------------------------
1454 setDynFlag, unSetDynFlag :: DynFlag -> DynP ()
1455 setDynFlag f = upd (\dfs -> foldl dopt_set (dopt_set dfs f) deps)
1457 deps = [ d | (f', ds) <- impliedFlags, f' == f, d <- ds ]
1458 -- When you set f, set the ones it implies
1459 -- When you un-set f, however, we don't un-set the things it implies
1460 -- (except for -fno-glasgow-exts, which is treated specially)
1462 unSetDynFlag f = upd (\dfs -> dopt_unset dfs f)
1464 --------------------------
1465 setDumpFlag :: DynFlag -> OptKind DynP
1466 setDumpFlag dump_flag
1467 = NoArg (setDynFlag Opt_ForceRecomp >> setDynFlag dump_flag)
1468 -- Whenver we -ddump, switch off the recompilation checker,
1469 -- else you don't see the dump!
1471 setVerboseCore2Core = do setDynFlag Opt_ForceRecomp
1472 setDynFlag Opt_D_verbose_core2core
1473 upd (\s -> s { shouldDumpSimplPhase = const True })
1475 setDumpSimplPhases s = do setDynFlag Opt_ForceRecomp
1476 upd (\s -> s { shouldDumpSimplPhase = spec })
1487 join op [] = const True
1488 join op ss = foldr1 (\f g x -> f x `op` g x) ss
1490 match "" = const True
1491 match s = case reads s of
1492 [(n,"")] -> phase_num n
1495 phase_num n (SimplPhase k) = n == k
1496 phase_num _ _ = False
1498 phase_name "gentle" SimplGently = True
1499 phase_name _ _ = False
1501 setVerbosity :: Maybe Int -> DynP ()
1502 setVerbosity mb_n = upd (\dfs -> dfs{ verbosity = mb_n `orElse` 3 })
1504 addCmdlineHCInclude :: String -> DynP ()
1505 addCmdlineHCInclude a = upd (\s -> s{cmdlineHcIncludes = a : cmdlineHcIncludes s})
1507 extraPkgConf_ :: FilePath -> DynP ()
1508 extraPkgConf_ p = upd (\s -> s{ extraPkgConfs = p : extraPkgConfs s })
1510 exposePackage, hidePackage, ignorePackage :: String -> DynP ()
1512 upd (\s -> s{ packageFlags = ExposePackage p : packageFlags s })
1514 upd (\s -> s{ packageFlags = HidePackage p : packageFlags s })
1516 upd (\s -> s{ packageFlags = IgnorePackage p : packageFlags s })
1518 setPackageName :: String -> DynFlags -> DynFlags
1520 | Nothing <- unpackPackageId pid
1521 = throwDyn (CmdLineError ("cannot parse \'" ++ p ++ "\' as a package identifier"))
1523 = \s -> s{ thisPackage = pid }
1525 pid = stringToPackageId p
1527 -- If we're linking a binary, then only targets that produce object
1528 -- code are allowed (requests for other target types are ignored).
1529 setTarget :: HscTarget -> DynP ()
1530 setTarget l = upd set
1533 | ghcLink dfs /= LinkBinary || isObjectTarget l = dfs{ hscTarget = l }
1536 -- Changes the target only if we're compiling object code. This is
1537 -- used by -fasm and -fvia-C, which switch from one to the other, but
1538 -- not from bytecode to object-code. The idea is that -fasm/-fvia-C
1539 -- can be safely used in an OPTIONS_GHC pragma.
1540 setObjTarget :: HscTarget -> DynP ()
1541 setObjTarget l = upd set
1544 | isObjectTarget (hscTarget dfs) = dfs { hscTarget = l }
1547 setOptLevel :: Int -> DynFlags -> DynFlags
1548 setOptLevel n dflags
1549 | hscTarget dflags == HscInterpreted && n > 0
1551 -- not in IO any more, oh well:
1552 -- putStr "warning: -O conflicts with --interactive; -O ignored.\n"
1554 = updOptLevel n dflags
1557 setMainIs :: String -> DynP ()
1559 | not (null main_fn) && isLower (head main_fn)
1560 -- The arg looked like "Foo.Bar.baz"
1561 = upd $ \d -> d{ mainFunIs = Just main_fn,
1562 mainModIs = mkModule mainPackageId (mkModuleName main_mod) }
1564 | isUpper (head arg) -- The arg looked like "Foo" or "Foo.Bar"
1565 = upd $ \d -> d{ mainModIs = mkModule mainPackageId (mkModuleName arg) }
1567 | otherwise -- The arg looked like "baz"
1568 = upd $ \d -> d{ mainFunIs = Just arg }
1570 (main_mod, main_fn) = splitLongestPrefix arg (== '.')
1572 -----------------------------------------------------------------------------
1573 -- Paths & Libraries
1575 addImportPath, addLibraryPath, addIncludePath, addFrameworkPath :: FilePath -> DynP ()
1577 -- -i on its own deletes the import paths
1578 addImportPath "" = upd (\s -> s{importPaths = []})
1579 addImportPath p = upd (\s -> s{importPaths = importPaths s ++ splitPathList p})
1583 upd (\s -> s{libraryPaths = libraryPaths s ++ splitPathList p})
1586 upd (\s -> s{includePaths = includePaths s ++ splitPathList p})
1588 addFrameworkPath p =
1589 upd (\s -> s{frameworkPaths = frameworkPaths s ++ splitPathList p})
1591 #ifndef mingw32_TARGET_OS
1592 split_marker :: Char
1593 split_marker = ':' -- not configurable (ToDo)
1596 splitPathList :: String -> [String]
1597 splitPathList s = filter notNull (splitUp s)
1598 -- empty paths are ignored: there might be a trailing
1599 -- ':' in the initial list, for example. Empty paths can
1600 -- cause confusion when they are translated into -I options
1601 -- for passing to gcc.
1603 #ifndef mingw32_TARGET_OS
1604 splitUp xs = split split_marker xs
1606 -- Windows: 'hybrid' support for DOS-style paths in directory lists.
1608 -- That is, if "foo:bar:baz" is used, this interpreted as
1609 -- consisting of three entries, 'foo', 'bar', 'baz'.
1610 -- However, with "c:/foo:c:\\foo;x:/bar", this is interpreted
1611 -- as 3 elts, "c:/foo", "c:\\foo", "x:/bar"
1613 -- Notice that no attempt is made to fully replace the 'standard'
1614 -- split marker ':' with the Windows / DOS one, ';'. The reason being
1615 -- that this will cause too much breakage for users & ':' will
1616 -- work fine even with DOS paths, if you're not insisting on being silly.
1619 splitUp (x:':':div:xs) | div `elem` dir_markers
1620 = ((x:':':div:p): splitUp rs)
1622 (p,rs) = findNextPath xs
1623 -- we used to check for existence of the path here, but that
1624 -- required the IO monad to be threaded through the command-line
1625 -- parser which is quite inconvenient. The
1626 splitUp xs = cons p (splitUp rs)
1628 (p,rs) = findNextPath xs
1633 -- will be called either when we've consumed nought or the
1634 -- "<Drive>:/" part of a DOS path, so splitting is just a Q of
1635 -- finding the next split marker.
1637 case break (`elem` split_markers) xs of
1638 (p, _:ds) -> (p, ds)
1641 split_markers :: [Char]
1642 split_markers = [':', ';']
1644 dir_markers :: [Char]
1645 dir_markers = ['/', '\\']
1648 -- -----------------------------------------------------------------------------
1649 -- tmpDir, where we store temporary files.
1651 setTmpDir :: FilePath -> DynFlags -> DynFlags
1652 setTmpDir dir dflags = dflags{ tmpDir = canonicalise dir }
1654 #if !defined(mingw32_HOST_OS)
1655 canonicalise p = normalise p
1657 -- Canonicalisation of temp path under win32 is a bit more
1658 -- involved: (a) strip trailing slash,
1659 -- (b) normalise slashes
1660 -- (c) just in case, if there is a prefix /cygdrive/x/, change to x:
1661 canonicalise path = removeTrailingSlash $ normalise $ xltCygdrive path
1663 -- if we're operating under cygwin, and TMP/TEMP is of
1664 -- the form "/cygdrive/drive/path", translate this to
1665 -- "drive:/path" (as GHC isn't a cygwin app and doesn't
1666 -- understand /cygdrive paths.)
1667 cygdrivePrefix = [pathSeparator] ++ "/cygdrive/" ++ [pathSeparator]
1668 xltCygdrive path = case maybePrefixMatch cygdrivePrefix path of
1670 | isPathSeparator sep -> drive:':':pathSeparator:xs
1673 -- strip the trailing backslash (awful, but we only do this once).
1674 removeTrailingSlash path
1675 | isPathSeparator (last path) = init path
1679 -----------------------------------------------------------------------------
1682 setOptHpcDir :: String -> DynP ()
1683 setOptHpcDir arg = upd $ \ d -> d{hpcDir = arg}
1685 -----------------------------------------------------------------------------
1686 -- Via-C compilation stuff
1688 -- There are some options that we need to pass to gcc when compiling
1689 -- Haskell code via C, but are only supported by recent versions of
1690 -- gcc. The configure script decides which of these options we need,
1691 -- and puts them in the file "extra-gcc-opts" in $topdir, which is
1692 -- read before each via-C compilation. The advantage of having these
1693 -- in a separate file is that the file can be created at install-time
1694 -- depending on the available gcc version, and even re-generated later
1695 -- if gcc is upgraded.
1697 -- The options below are not dependent on the version of gcc, only the
1700 machdepCCOpts :: DynFlags -> ([String], -- flags for all C compilations
1701 [String]) -- for registerised HC compilations
1702 machdepCCOpts _dflags
1703 #if alpha_TARGET_ARCH
1705 #ifdef HAVE_THREADED_RTS_SUPPORT
1709 -- For now, to suppress the gcc warning "call-clobbered
1710 -- register used for global register variable", we simply
1711 -- disable all warnings altogether using the -w flag. Oh well.
1713 #elif hppa_TARGET_ARCH
1714 -- ___HPUX_SOURCE, not _HPUX_SOURCE, is #defined if -ansi!
1715 -- (very nice, but too bad the HP /usr/include files don't agree.)
1716 = ( ["-D_HPUX_SOURCE"], [] )
1718 #elif m68k_TARGET_ARCH
1719 -- -fno-defer-pop : for the .hc files, we want all the pushing/
1720 -- popping of args to routines to be explicit; if we let things
1721 -- be deferred 'til after an STGJUMP, imminent death is certain!
1723 -- -fomit-frame-pointer : *don't*
1724 -- It's better to have a6 completely tied up being a frame pointer
1725 -- rather than let GCC pick random things to do with it.
1726 -- (If we want to steal a6, then we would try to do things
1727 -- as on iX86, where we *do* steal the frame pointer [%ebp].)
1728 = ( [], ["-fno-defer-pop", "-fno-omit-frame-pointer"] )
1730 #elif i386_TARGET_ARCH
1731 -- -fno-defer-pop : basically the same game as for m68k
1733 -- -fomit-frame-pointer : *must* in .hc files; because we're stealing
1734 -- the fp (%ebp) for our register maps.
1735 = let n_regs = stolen_x86_regs _dflags
1738 ( [ if sta then "-DDONT_WANT_WIN32_DLL_SUPPORT" else ""
1739 -- , if "mingw32" `isSuffixOf` cTARGETPLATFORM then "-mno-cygwin" else ""
1742 "-fomit-frame-pointer",
1743 -- we want -fno-builtin, because when gcc inlines
1744 -- built-in functions like memcpy() it tends to
1745 -- run out of registers, requiring -monly-n-regs
1747 "-DSTOLEN_X86_REGS="++show n_regs ]
1750 #elif ia64_TARGET_ARCH
1751 = ( [], ["-fomit-frame-pointer", "-G0"] )
1753 #elif x86_64_TARGET_ARCH
1754 = ( [], ["-fomit-frame-pointer",
1755 "-fno-asynchronous-unwind-tables",
1756 -- the unwind tables are unnecessary for HC code,
1757 -- and get in the way of -split-objs. Another option
1758 -- would be to throw them away in the mangler, but this
1761 -- calling builtins like strlen() using the FFI can
1762 -- cause gcc to run out of regs, so use the external
1766 #elif sparc_TARGET_ARCH
1768 -- For now, to suppress the gcc warning "call-clobbered
1769 -- register used for global register variable", we simply
1770 -- disable all warnings altogether using the -w flag. Oh well.
1772 #elif powerpc_apple_darwin_TARGET
1774 -- Disable Apple's precompiling preprocessor. It's a great thing
1775 -- for "normal" programs, but it doesn't support register variable
1777 = ( [], ["-no-cpp-precomp"] )
1782 picCCOpts :: DynFlags -> [String]
1784 #if darwin_TARGET_OS
1785 -- Apple prefers to do things the other way round.
1786 -- PIC is on by default.
1787 -- -mdynamic-no-pic:
1788 -- Turn off PIC code generation.
1790 -- Don't generate "common" symbols - these are unwanted
1791 -- in dynamic libraries.
1794 = ["-fno-common", "-D__PIC__"]
1796 = ["-mdynamic-no-pic"]
1797 #elif mingw32_TARGET_OS
1798 -- no -fPIC for Windows
1805 = ["-fPIC", "-D__PIC__"]
1810 -- -----------------------------------------------------------------------------
1814 can_split = cSplitObjs == "YES"
1816 -- -----------------------------------------------------------------------------
1819 compilerInfo :: [(String, String)]
1820 compilerInfo = [("Project name", cProjectName),
1821 ("Project version", cProjectVersion),
1822 ("Booter version", cBooterVersion),
1824 ("Interface file version", cHscIfaceFileVersion),
1825 ("Have interpreter", cGhcWithInterpreter),
1826 ("Object splitting", cSplitObjs),
1827 ("Have native code generator", cGhcWithNativeCodeGen),
1828 ("Support SMP", cGhcWithSMP),
1829 ("Unregisterised", cGhcUnregisterised),
1830 ("Tables next to code", cGhcEnableTablesNextToCode),
1831 ("Win32 DLLs", cEnableWin32DLLs),
1832 ("RTS ways", cGhcRTSWays),
1833 ("Leading underscore", cLeadingUnderscore)]