6 -- (c) The University of Glasgow 2005
9 -- Most flags are dynamic flags, which means they can change from
10 -- compilation to compilation using @OPTIONS_GHC@ pragmas, and in a
11 -- multi-session GHC each session can be using different dynamic
12 -- flags. Dynamic flags can also be set at the prompt in GHCi.
14 -- * Dynamic flags and associated configuration types
17 HscTarget(..), isObjectTarget, defaultObjectTarget,
18 GhcMode(..), isOneShot,
19 GhcLink(..), isNoLink,
26 -- ** Manipulating DynFlags
27 defaultDynFlags, -- DynFlags
28 initDynFlags, -- DynFlags -> IO DynFlags
30 dopt, -- DynFlag -> DynFlags -> Bool
31 dopt_set, dopt_unset, -- DynFlags -> DynFlag -> DynFlags
32 getOpts, -- DynFlags -> (DynFlags -> [a]) -> [a]
39 -- ** Parsing DynFlags
43 supportedLanguages, languageOptions,
45 -- ** DynFlag C compiler options
46 machdepCCOpts, picCCOpts,
48 -- * Configuration of the core-to-core passes
55 -- * Configuration of the stg-to-stg passes
59 -- * Compiler configuration suitable for display to the user
63 #include "HsVersions.h"
67 import PrelNames ( mAIN, main_RDR_Unqual )
68 import RdrName ( RdrName, mkRdrUnqual )
69 import OccName ( mkVarOccFS )
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 )
81 import UniqFM ( UniqFM )
83 import Maybes ( orElse )
87 import {-# SOURCE #-} ErrUtils ( Severity(..), Message, mkLocMessage )
89 import Data.IORef ( readIORef )
90 import Control.Monad ( when )
93 import System.FilePath
94 import System.IO ( stderr, hPutChar )
96 -- -----------------------------------------------------------------------------
99 -- | Enumerates the simple on-or-off dynamic flags
105 | Opt_D_dump_cmmz_pretty
109 | Opt_D_dump_asm_native
110 | Opt_D_dump_asm_liveness
111 | Opt_D_dump_asm_coalesce
112 | Opt_D_dump_asm_regalloc
113 | Opt_D_dump_asm_regalloc_stages
114 | Opt_D_dump_asm_conflicts
115 | Opt_D_dump_asm_stats
121 | Opt_D_dump_inlinings
122 | Opt_D_dump_rule_firings
123 | Opt_D_dump_occur_anal
127 | Opt_D_dump_simpl_iterations
128 | Opt_D_dump_simpl_phases
137 | Opt_D_dump_worker_wrapper
138 | Opt_D_dump_rn_trace
139 | Opt_D_dump_rn_stats
141 | Opt_D_dump_simpl_stats
142 | Opt_D_dump_tc_trace
143 | Opt_D_dump_if_trace
149 | Opt_D_verbose_core2core
150 | Opt_D_verbose_stg2stg
152 | Opt_D_dump_hi_diffs
153 | Opt_D_dump_minimal_imports
154 | Opt_D_dump_mod_cycles
155 | Opt_D_dump_view_pattern_commoning
156 | Opt_D_faststring_stats
157 | Opt_DumpToFile -- ^ Append dump output to files instead of stdout.
158 | Opt_D_no_debug_output
164 | Opt_WarnIsError -- -Werror; makes warnings fatal
165 | Opt_WarnDuplicateExports
167 | Opt_WarnImplicitPrelude
168 | Opt_WarnIncompletePatterns
169 | Opt_WarnIncompletePatternsRecUpd
170 | Opt_WarnMissingFields
171 | Opt_WarnMissingMethods
172 | Opt_WarnMissingSigs
173 | Opt_WarnNameShadowing
174 | Opt_WarnOverlappingPatterns
175 | Opt_WarnSimplePatterns
176 | Opt_WarnTypeDefaults
177 | Opt_WarnMonomorphism
178 | Opt_WarnUnusedBinds
179 | Opt_WarnUnusedImports
180 | Opt_WarnUnusedMatches
181 | Opt_WarnWarningsDeprecations
182 | Opt_WarnDeprecatedFlags
183 | Opt_WarnDodgyImports
186 | Opt_WarnUnrecognisedPragmas
187 | Opt_WarnDodgyForeignImports
190 | Opt_OverlappingInstances
191 | Opt_UndecidableInstances
192 | Opt_IncoherentInstances
193 | Opt_MonomorphismRestriction
195 | Opt_ExtendedDefaultRules -- Use GHC's extended rules for defaulting
196 | Opt_ForeignFunctionInterface
197 | Opt_UnliftedFFITypes
198 | Opt_PArr -- Syntactic support for parallel arrays
199 | Opt_Arrows -- Arrow-notation syntax
200 | Opt_TemplateHaskell
203 | Opt_Generics -- "Derivable type classes"
204 | Opt_ImplicitPrelude
205 | Opt_ScopedTypeVariables
209 | Opt_OverloadedStrings
210 | Opt_DisambiguateRecordFields
211 | Opt_RecordWildCards
216 | Opt_StandaloneDeriving
217 | Opt_DeriveDataTypeable
218 | Opt_TypeSynonymInstances
219 | Opt_FlexibleContexts
220 | Opt_FlexibleInstances
221 | Opt_ConstrainedClassMethods
222 | Opt_MultiParamTypeClasses
223 | Opt_FunctionalDependencies
225 | Opt_PolymorphicComponents
226 | Opt_ExistentialQuantification
230 | Opt_ParallelListComp
231 | Opt_TransformListComp
232 | Opt_GeneralizedNewtypeDeriving
234 | Opt_PostfixOperators
236 | Opt_LiberalTypeSynonyms
239 | Opt_ImpredicativeTypes
243 | Opt_PrintExplicitForalls
248 | Opt_StaticArgumentTransformation
252 | Opt_IgnoreInterfacePragmas
253 | Opt_OmitInterfacePragmas
254 | Opt_DoLambdaEtaExpansion
258 | Opt_UnboxStrictFields
261 | Opt_EnableRewriteRules -- Apply rewrite rules during simplification
263 | Opt_RegsGraph -- do graph coloring register allocation
264 | Opt_RegsIterative -- do iterative coalescing graph coloring register allocation
272 | Opt_ExcessPrecision
273 | Opt_ReadUserPackageConf
277 | Opt_HideAllPackages
278 | Opt_PrintBindResult
282 | Opt_BreakOnException
284 | Opt_PrintEvldWithShow
285 | Opt_PrintBindContents
289 | Opt_ConvertToZipCfgAndBack
290 | Opt_AutoLinkPackages
291 | Opt_ImplicitImportQualified
302 -- | Contains not only a collection of 'DynFlag's but also a plethora of
303 -- information relating to the compilation of a single file or GHC session
304 data DynFlags = DynFlags {
307 coreToDo :: Maybe [CoreToDo], -- reserved for -Ofile
308 stgToDo :: Maybe [StgToDo], -- similarly
309 hscTarget :: HscTarget,
310 hscOutName :: String, -- ^ Name of the output file
311 extCoreName :: String, -- ^ Name of the .hcr output file
312 verbosity :: Int, -- ^ Verbosity level: see "DynFlags#verbosity_levels"
313 optLevel :: Int, -- ^ Optimisation level
314 simplPhases :: Int, -- ^ Number of simplifier phases
315 maxSimplIterations :: Int, -- ^ Max simplifier iterations
316 shouldDumpSimplPhase :: SimplifierMode -> Bool,
317 ruleCheck :: Maybe String,
319 specConstrThreshold :: Maybe Int, -- ^ Threshold for SpecConstr
320 specConstrCount :: Maybe Int, -- ^ Max number of specialisations for any one function
321 liberateCaseThreshold :: Maybe Int, -- ^ Threshold for LiberateCase
323 stolen_x86_regs :: Int,
324 cmdlineHcIncludes :: [String], -- ^ @\-\#includes@
325 importPaths :: [FilePath],
327 mainFunIs :: Maybe String,
328 ctxtStkDepth :: Int, -- ^ Typechecker context stack depth
330 dphBackend :: DPHBackend,
332 thisPackage :: PackageId, -- ^ name of package currently being compiled
335 wayNames :: [WayName], -- ^ Way flags from the command line
336 buildTag :: String, -- ^ The global \"way\" (e.g. \"p\" for prof)
337 rtsBuildTag :: String, -- ^ The RTS \"way\"
340 objectDir :: Maybe String,
341 hiDir :: Maybe String,
342 stubDir :: Maybe String,
348 outputFile :: Maybe String,
349 outputHi :: Maybe String,
350 dynLibLoader :: DynLibLoader,
352 -- | This is set by 'DriverPipeline.runPipeline' based on where
353 -- its output is going.
354 dumpPrefix :: Maybe FilePath,
356 -- | Override the 'dumpPrefix' set by 'DriverPipeline.runPipeline'.
357 -- Set by @-ddump-file-prefix@
358 dumpPrefixForce :: Maybe FilePath,
360 includePaths :: [String],
361 libraryPaths :: [String],
362 frameworkPaths :: [String], -- used on darwin only
363 cmdlineFrameworks :: [String], -- ditto
364 tmpDir :: String, -- no trailing '/'
366 ghcUsagePath :: FilePath, -- Filled in by SysTools
367 ghciUsagePath :: FilePath, -- ditto
369 hpcDir :: String, -- ^ Path to store the .mix files
371 -- options for particular phases
379 opt_windres :: [String],
381 -- commands for particular phases
383 pgm_P :: (String,[Option]),
385 pgm_c :: (String,[Option]),
386 pgm_m :: (String,[Option]),
387 pgm_s :: (String,[Option]),
388 pgm_a :: (String,[Option]),
389 pgm_l :: (String,[Option]),
390 pgm_dll :: (String,[Option]),
392 pgm_sysman :: String,
393 pgm_windres :: String,
396 depMakefile :: FilePath,
397 depIncludePkgDeps :: Bool,
398 depExcludeMods :: [ModuleName],
399 depSuffixes :: [String],
403 extraPkgConfs :: [FilePath],
404 topDir :: FilePath, -- filled in by SysTools
405 systemPackageConfig :: FilePath, -- ditto
406 -- ^ The @-package-conf@ flags given on the command line, in the order
409 packageFlags :: [PackageFlag],
410 -- ^ The @-package@ and @-hide-package@ flags from the command-line
413 -- NB. do not modify this field, it is calculated by
414 -- Packages.initPackages and Packages.updatePackages.
415 pkgDatabase :: Maybe (UniqFM PackageConfig),
416 pkgState :: PackageState,
421 -- | Message output action: use "ErrUtils" instead of this if you can
422 log_action :: Severity -> SrcSpan -> PprStyle -> Message -> IO (),
424 haddockOptions :: Maybe String
435 -- | Will this target result in an object file on the disk?
436 isObjectTarget :: HscTarget -> Bool
437 isObjectTarget HscC = True
438 isObjectTarget HscAsm = True
439 isObjectTarget _ = False
441 -- | The 'GhcMode' tells us whether we're doing multi-module
442 -- compilation (controlled via the "GHC" API) or one-shot
443 -- (single-module) compilation. This makes a difference primarily to
444 -- the "Finder": in one-shot mode we look for interface files for
445 -- imported modules, but in multi-module mode we look for source files
446 -- in order to check whether they need to be recompiled.
448 = CompManager -- ^ @\-\-make@, GHCi, etc.
449 | OneShot -- ^ @ghc -c Foo.hs@
450 | MkDepend -- ^ @ghc -M@, see "Finder" for why we need this
453 isOneShot :: GhcMode -> Bool
454 isOneShot OneShot = True
455 isOneShot _other = False
457 -- | What to do in the link step, if there is one.
459 = NoLink -- ^ Don't link at all
460 | LinkBinary -- ^ Link object code into a binary
461 | LinkInMemory -- ^ Use the in-memory dynamic linker
462 | LinkDynLib -- ^ Link objects into a dynamic lib (DLL on Windows, DSO on ELF platforms)
465 isNoLink :: GhcLink -> Bool
466 isNoLink NoLink = True
470 = ExposePackage String
472 | IgnorePackage String
475 defaultHscTarget :: HscTarget
476 defaultHscTarget = defaultObjectTarget
478 -- | The 'HscTarget' value corresponding to the default way to create
479 -- object files on the current platform.
480 defaultObjectTarget :: HscTarget
482 | cGhcWithNativeCodeGen == "YES" = HscAsm
487 | Wrapped (Maybe String)
491 -- | Used by 'GHC.newSession' to partially initialize a new 'DynFlags' value
492 initDynFlags :: DynFlags -> IO DynFlags
493 initDynFlags dflags = do
494 -- someday these will be dynamic flags
495 ways <- readIORef v_Ways
496 build_tag <- readIORef v_Build_tag
497 rts_build_tag <- readIORef v_RTS_Build_tag
500 buildTag = build_tag,
501 rtsBuildTag = rts_build_tag
504 -- | The normal 'DynFlags'. Note that they is not suitable for use in this form
505 -- and must be fully initialized by 'GHC.newSession' first.
506 defaultDynFlags :: DynFlags
509 ghcMode = CompManager,
510 ghcLink = LinkBinary,
513 hscTarget = defaultHscTarget,
519 maxSimplIterations = 4,
520 shouldDumpSimplPhase = const False,
522 specConstrThreshold = Just 200,
523 specConstrCount = Just 3,
524 liberateCaseThreshold = Just 200,
526 cmdlineHcIncludes = [],
530 ctxtStkDepth = mAX_CONTEXT_REDUCTION_DEPTH,
534 thisPackage = mainPackageId,
540 objectSuf = phaseInputExt StopLn,
541 hcSuf = phaseInputExt HCc,
544 outputFile = Nothing,
546 dynLibLoader = Deployable,
547 dumpPrefix = Nothing,
548 dumpPrefixForce = Nothing,
552 cmdlineFrameworks = [],
553 tmpDir = cDEFAULT_TMPDIR,
570 pkgDatabase = Nothing,
571 pkgState = panic "no package state yet: call GHC.setSessionDynFlags",
572 wayNames = panic "defaultDynFlags: No wayNames",
573 buildTag = panic "defaultDynFlags: No buildTag",
574 rtsBuildTag = panic "defaultDynFlags: No rtsBuildTag",
575 -- initSysTools fills all these in
576 ghcUsagePath = panic "defaultDynFlags: No ghciUsagePath",
577 ghciUsagePath = panic "defaultDynFlags: No ghciUsagePath",
578 topDir = panic "defaultDynFlags: No topDir",
579 systemPackageConfig = panic "no systemPackageConfig: call GHC.setSessionDynFlags",
580 pgm_L = panic "defaultDynFlags: No pgm_L",
581 pgm_P = panic "defaultDynFlags: No pgm_P",
582 pgm_F = panic "defaultDynFlags: No pgm_F",
583 pgm_c = panic "defaultDynFlags: No pgm_c",
584 pgm_m = panic "defaultDynFlags: No pgm_m",
585 pgm_s = panic "defaultDynFlags: No pgm_s",
586 pgm_a = panic "defaultDynFlags: No pgm_a",
587 pgm_l = panic "defaultDynFlags: No pgm_l",
588 pgm_dll = panic "defaultDynFlags: No pgm_dll",
589 pgm_T = panic "defaultDynFlags: No pgm_T",
590 pgm_sysman = panic "defaultDynFlags: No pgm_sysman",
591 pgm_windres = panic "defaultDynFlags: No pgm_windres",
592 -- end of initSysTools values
594 depMakefile = "Makefile",
595 depIncludePkgDeps = False,
599 -- end of ghc -M values
600 haddockOptions = Nothing,
602 Opt_AutoLinkPackages,
603 Opt_ReadUserPackageConf,
605 Opt_MonoPatBinds, -- Experimentally, I'm making this non-standard
606 -- behaviour the default, to see if anyone notices
610 Opt_MonomorphismRestriction,
618 Opt_PrintBindContents
620 ++ [f | (ns,f) <- optLevelFlags, 0 `elem` ns]
621 -- The default -O0 options
624 log_action = \severity srcSpan style msg ->
626 SevInfo -> printErrs (msg style)
627 SevFatal -> printErrs (msg style)
630 printErrs ((mkLocMessage srcSpan msg) style)
631 -- careful (#2302): printErrs prints in UTF-8, whereas
632 -- converting to string first and using hPutStr would
633 -- just emit the low 8 bits of each unicode char.
640 0 | print errors & warnings only
641 1 | minimal verbosity: print "compiling M ... done." for each module.
642 2 | equivalent to -dshow-passes
643 3 | equivalent to existing "ghc -v"
644 4 | "ghc -v -ddump-most"
645 5 | "ghc -v -ddump-all"
648 -- | Test whether a 'DynFlag' is set
649 dopt :: DynFlag -> DynFlags -> Bool
650 dopt f dflags = f `elem` (flags dflags)
653 dopt_set :: DynFlags -> DynFlag -> DynFlags
654 dopt_set dfs f = dfs{ flags = f : flags dfs }
656 -- | Unset a 'DynFlag'
657 dopt_unset :: DynFlags -> DynFlag -> DynFlags
658 dopt_unset dfs f = dfs{ flags = filter (/= f) (flags dfs) }
660 -- | Retrieve the options corresponding to a particular @opt_*@ field in the correct order
661 getOpts :: DynFlags -- ^ 'DynFlags' to retrieve the options from
662 -> (DynFlags -> [a]) -- ^ Relevant record accessor: one of the @opt_*@ accessors
663 -> [a] -- ^ Correctly ordered extracted options
664 getOpts dflags opts = reverse (opts dflags)
665 -- We add to the options from the front, so we need to reverse the list
667 -- | Gets the verbosity flag for the current verbosity level. This is fed to
668 -- other tools, so GHC-specific verbosity flags like @-ddump-most@ are not included
669 getVerbFlag :: DynFlags -> String
671 | verbosity dflags >= 3 = "-v"
674 setObjectDir, setHiDir, setStubDir, setObjectSuf, setHiSuf, setHcSuf, parseDynLibLoaderMode,
675 setPgmP, setPgmL, setPgmF, setPgmc, setPgmm, setPgms, setPgma, setPgml, setPgmdll, setPgmwindres,
676 addOptL, addOptP, addOptF, addOptc, addOptm, addOpta, addOptl, addOptwindres,
677 addCmdlineFramework, addHaddockOpts
678 :: String -> DynFlags -> DynFlags
679 setOutputFile, setOutputHi, setDumpPrefixForce
680 :: Maybe String -> DynFlags -> DynFlags
682 setObjectDir f d = d{ objectDir = Just f}
683 setHiDir f d = d{ hiDir = Just f}
684 setStubDir f d = d{ stubDir = Just f, includePaths = f : includePaths d }
685 -- -stubdir D adds an implicit -I D, so that gcc can find the _stub.h file
686 -- \#included from the .hc file when compiling with -fvia-C.
688 setObjectSuf f d = d{ objectSuf = f}
689 setHiSuf f d = d{ hiSuf = f}
690 setHcSuf f d = d{ hcSuf = f}
692 setOutputFile f d = d{ outputFile = f}
693 setOutputHi f d = d{ outputHi = f}
695 parseDynLibLoaderMode f d =
697 ("deploy", "") -> d{ dynLibLoader = Deployable }
698 ("sysdep", "") -> d{ dynLibLoader = SystemDependent }
699 ("wrapped", "") -> d{ dynLibLoader = Wrapped Nothing }
700 ("wrapped:", "hard") -> d{ dynLibLoader = Wrapped Nothing }
701 ("wrapped:", flex) -> d{ dynLibLoader = Wrapped (Just flex) }
702 (_,_) -> error "Unknown dynlib loader"
704 setDumpPrefixForce f d = d { dumpPrefixForce = f}
706 -- XXX HACK: Prelude> words "'does not' work" ===> ["'does","not'","work"]
707 -- Config.hs should really use Option.
708 setPgmP f d = let (pgm:args) = words f in d{ pgm_P = (pgm, map Option args)}
710 setPgmL f d = d{ pgm_L = f}
711 setPgmF f d = d{ pgm_F = f}
712 setPgmc f d = d{ pgm_c = (f,[])}
713 setPgmm f d = d{ pgm_m = (f,[])}
714 setPgms f d = d{ pgm_s = (f,[])}
715 setPgma f d = d{ pgm_a = (f,[])}
716 setPgml f d = d{ pgm_l = (f,[])}
717 setPgmdll f d = d{ pgm_dll = (f,[])}
718 setPgmwindres f d = d{ pgm_windres = f}
720 addOptL f d = d{ opt_L = f : opt_L d}
721 addOptP f d = d{ opt_P = f : opt_P d}
722 addOptF f d = d{ opt_F = f : opt_F d}
723 addOptc f d = d{ opt_c = f : opt_c d}
724 addOptm f d = d{ opt_m = f : opt_m d}
725 addOpta f d = d{ opt_a = f : opt_a d}
726 addOptl f d = d{ opt_l = f : opt_l d}
727 addOptwindres f d = d{ opt_windres = f : opt_windres d}
729 setDepMakefile :: FilePath -> DynFlags -> DynFlags
730 setDepMakefile f d = d { depMakefile = deOptDep f }
732 setDepIncludePkgDeps :: Bool -> DynFlags -> DynFlags
733 setDepIncludePkgDeps b d = d { depIncludePkgDeps = b }
735 addDepExcludeMod :: String -> DynFlags -> DynFlags
737 = d { depExcludeMods = mkModuleName (deOptDep m) : depExcludeMods d }
739 addDepSuffix :: FilePath -> DynFlags -> DynFlags
740 addDepSuffix s d = d { depSuffixes = deOptDep s : depSuffixes d }
742 setDepWarnings :: Bool -> DynFlags -> DynFlags
743 setDepWarnings b d = d { depWarnings = b }
746 -- We used to use "-optdep-flag -optdeparg", so for legacy applications
747 -- we need to strip the "-optdep" off of the arg
748 deOptDep :: String -> String
749 deOptDep x = case maybePrefixMatch "-optdep" x of
753 addCmdlineFramework f d = d{ cmdlineFrameworks = f : cmdlineFrameworks d}
755 addHaddockOpts f d = d{ haddockOptions = Just f}
757 -- -----------------------------------------------------------------------------
758 -- Command-line options
760 -- | When invoking external tools as part of the compilation pipeline, we
761 -- pass these a sequence of options on the command-line. Rather than
762 -- just using a list of Strings, we use a type that allows us to distinguish
763 -- between filepaths and 'other stuff'. The reason for this is that
764 -- this type gives us a handle on transforming filenames, and filenames only,
765 -- to whatever format they're expected to be on a particular platform.
767 = FileOption -- an entry that _contains_ filename(s) / filepaths.
768 String -- a non-filepath prefix that shouldn't be
769 -- transformed (e.g., "/out=")
770 String -- the filepath/filename portion
773 -----------------------------------------------------------------------------
774 -- Setting the optimisation level
776 updOptLevel :: Int -> DynFlags -> DynFlags
777 -- ^ Sets the 'DynFlags' to be appropriate to the optimisation level
779 = dfs2{ optLevel = final_n }
781 final_n = max 0 (min 2 n) -- Clamp to 0 <= n <= 2
782 dfs1 = foldr (flip dopt_unset) dfs remove_dopts
783 dfs2 = foldr (flip dopt_set) dfs1 extra_dopts
785 extra_dopts = [ f | (ns,f) <- optLevelFlags, final_n `elem` ns ]
786 remove_dopts = [ f | (ns,f) <- optLevelFlags, final_n `notElem` ns ]
788 optLevelFlags :: [([Int], DynFlag)]
790 = [ ([0], Opt_IgnoreInterfacePragmas)
791 , ([0], Opt_OmitInterfacePragmas)
793 , ([1,2], Opt_IgnoreAsserts)
794 , ([1,2], Opt_EnableRewriteRules) -- Off for -O0; see Note [Scoping for Builtin rules]
796 , ([1,2], Opt_DoEtaReduction)
797 , ([1,2], Opt_CaseMerge)
798 , ([1,2], Opt_Strictness)
800 , ([1,2], Opt_FullLaziness)
802 , ([2], Opt_LiberateCase)
803 , ([2], Opt_SpecConstr)
805 -- , ([2], Opt_StaticArgumentTransformation)
806 -- Max writes: I think it's probably best not to enable SAT with -O2 for the
807 -- 6.10 release. The version of SAT in HEAD at the moment doesn't incorporate
808 -- several improvements to the heuristics, and I'm concerned that without
809 -- those changes SAT will interfere with some attempts to write "high
810 -- performance Haskell", as we saw in some posts on Haskell-Cafe earlier
811 -- this year. In particular, the version in HEAD lacks the tail call
812 -- criterion, so many things that look like reasonable loops will be
813 -- turned into functions with extra (unneccesary) thunk creation.
815 , ([0,1,2], Opt_DoLambdaEtaExpansion)
816 -- This one is important for a tiresome reason:
817 -- we want to make sure that the bindings for data
818 -- constructors are eta-expanded. This is probably
819 -- a good thing anyway, but it seems fragile.
822 -- -----------------------------------------------------------------------------
823 -- Standard sets of warning options
825 standardWarnings :: [DynFlag]
827 = [ Opt_WarnWarningsDeprecations,
828 Opt_WarnDeprecatedFlags,
829 Opt_WarnUnrecognisedPragmas,
830 Opt_WarnOverlappingPatterns,
831 Opt_WarnMissingFields,
832 Opt_WarnMissingMethods,
833 Opt_WarnDuplicateExports,
834 Opt_WarnDodgyForeignImports
837 minusWOpts :: [DynFlag]
839 = standardWarnings ++
840 [ Opt_WarnUnusedBinds,
841 Opt_WarnUnusedMatches,
842 Opt_WarnUnusedImports,
843 Opt_WarnIncompletePatterns,
847 minusWallOpts :: [DynFlag]
850 [ Opt_WarnTypeDefaults,
851 Opt_WarnNameShadowing,
857 -- minuswRemovesOpts should be every warning option
858 minuswRemovesOpts :: [DynFlag]
861 [Opt_WarnImplicitPrelude,
862 Opt_WarnIncompletePatternsRecUpd,
863 Opt_WarnSimplePatterns,
864 Opt_WarnMonomorphism,
865 Opt_WarnUnrecognisedPragmas,
869 -- -----------------------------------------------------------------------------
870 -- CoreToDo: abstraction of core-to-core passes to run.
872 data CoreToDo -- These are diff core-to-core passes,
873 -- which may be invoked in any order,
874 -- as many times as you like.
876 = CoreDoSimplify -- The core-to-core simplifier.
879 -- Each run of the simplifier can take a different
880 -- set of simplifier-specific flags.
882 | CoreDoFloatOutwards FloatOutSwitches
887 | CoreDoWorkerWrapper
890 | CoreDoOldStrictness
893 | CoreDoRuleCheck Int{-CompilerPhase-} String -- Check for non-application of rules
894 -- matching this string
895 | CoreDoVectorisation DPHBackend
896 | CoreDoNothing -- Useful when building up
897 | CoreDoPasses [CoreToDo] -- lists of these things
899 data SimplifierMode -- See comments in SimplMonad
901 | SimplPhase Int [String]
903 data SimplifierSwitch
904 = MaxSimplifierIterations Int
907 data FloatOutSwitches
908 = FloatOutSw Bool -- True <=> float lambdas to top level
909 Bool -- True <=> float constants to top level,
910 -- even if they do not escape a lambda
913 -- The core-to-core pass ordering is derived from the DynFlags:
914 runWhen :: Bool -> CoreToDo -> CoreToDo
915 runWhen True do_this = do_this
916 runWhen False _ = CoreDoNothing
918 runMaybe :: Maybe a -> (a -> CoreToDo) -> CoreToDo
919 runMaybe (Just x) f = f x
920 runMaybe Nothing _ = CoreDoNothing
922 getCoreToDo :: DynFlags -> [CoreToDo]
924 | Just todo <- coreToDo dflags = todo -- set explicitly by user
925 | otherwise = core_todo
927 opt_level = optLevel dflags
928 phases = simplPhases dflags
929 max_iter = maxSimplIterations dflags
930 strictness = dopt Opt_Strictness dflags
931 full_laziness = dopt Opt_FullLaziness dflags
932 cse = dopt Opt_CSE dflags
933 spec_constr = dopt Opt_SpecConstr dflags
934 liberate_case = dopt Opt_LiberateCase dflags
935 rule_check = ruleCheck dflags
936 static_args = dopt Opt_StaticArgumentTransformation dflags
938 maybe_rule_check phase = runMaybe rule_check (CoreDoRuleCheck phase)
940 simpl_phase phase names iter
942 [ CoreDoSimplify (SimplPhase phase names) [
943 MaxSimplifierIterations iter
945 maybe_rule_check phase
949 = runWhen (dopt Opt_Vectorise dflags)
950 $ CoreDoPasses [ simpl_gently, CoreDoVectorisation (dphBackend dflags) ]
953 -- By default, we have 2 phases before phase 0.
955 -- Want to run with inline phase 2 after the specialiser to give
956 -- maximum chance for fusion to work before we inline build/augment
957 -- in phase 1. This made a difference in 'ansi' where an
958 -- overloaded function wasn't inlined till too late.
960 -- Need phase 1 so that build/augment get
961 -- inlined. I found that spectral/hartel/genfft lost some useful
962 -- strictness in the function sumcode' if augment is not inlined
963 -- before strictness analysis runs
964 simpl_phases = CoreDoPasses [ simpl_phase phase ["main"] max_iter
965 | phase <- [phases, phases-1 .. 1] ]
968 -- initial simplify: mk specialiser happy: minimum effort please
969 simpl_gently = CoreDoSimplify SimplGently [
971 -- Don't inline anything till full laziness has bitten
972 -- In particular, inlining wrappers inhibits floating
973 -- e.g. ...(case f x of ...)...
974 -- ==> ...(case (case x of I# x# -> fw x#) of ...)...
975 -- ==> ...(case x of I# x# -> case fw x# of ...)...
976 -- and now the redex (f x) isn't floatable any more
977 -- Similarly, don't apply any rules until after full
978 -- laziness. Notably, list fusion can prevent floating.
980 NoCaseOfCase, -- Don't do case-of-case transformations.
981 -- This makes full laziness work better
982 MaxSimplifierIterations max_iter
986 if opt_level == 0 then
988 simpl_phase 0 ["final"] max_iter]
989 else {- opt_level >= 1 -} [
991 -- We want to do the static argument transform before full laziness as it
992 -- may expose extra opportunities to float things outwards. However, to fix
993 -- up the output of the transformation we need at do at least one simplify
994 -- after this before anything else
995 runWhen static_args (CoreDoPasses [ simpl_gently, CoreDoStaticArgs ]),
997 -- We run vectorisation here for now, but we might also try to run
1001 -- initial simplify: mk specialiser happy: minimum effort please
1004 -- Specialisation is best done before full laziness
1005 -- so that overloaded functions have all their dictionary lambdas manifest
1008 runWhen full_laziness (CoreDoFloatOutwards (FloatOutSw False False)),
1014 -- Phase 0: allow all Ids to be inlined now
1015 -- This gets foldr inlined before strictness analysis
1017 -- At least 3 iterations because otherwise we land up with
1018 -- huge dead expressions because of an infelicity in the
1020 -- let k = BIG in foldr k z xs
1021 -- ==> let k = BIG in letrec go = \xs -> ...(k x).... in go xs
1022 -- ==> let k = BIG in letrec go = \xs -> ...(BIG x).... in go xs
1024 simpl_phase 0 ["main"] (max max_iter 3),
1027 #ifdef OLD_STRICTNESS
1028 CoreDoOldStrictness,
1030 runWhen strictness (CoreDoPasses [
1032 CoreDoWorkerWrapper,
1034 simpl_phase 0 ["post-worker-wrapper"] max_iter
1037 runWhen full_laziness
1038 (CoreDoFloatOutwards (FloatOutSw False -- Not lambdas
1039 True)), -- Float constants
1040 -- nofib/spectral/hartel/wang doubles in speed if you
1041 -- do full laziness late in the day. It only happens
1042 -- after fusion and other stuff, so the early pass doesn't
1043 -- catch it. For the record, the redex is
1044 -- f_el22 (f_el21 r_midblock)
1047 runWhen cse CoreCSE,
1048 -- We want CSE to follow the final full-laziness pass, because it may
1049 -- succeed in commoning up things floated out by full laziness.
1050 -- CSE used to rely on the no-shadowing invariant, but it doesn't any more
1056 -- Case-liberation for -O2. This should be after
1057 -- strictness analysis and the simplification which follows it.
1058 runWhen liberate_case (CoreDoPasses [
1060 simpl_phase 0 ["post-liberate-case"] max_iter
1061 ]), -- Run the simplifier after LiberateCase to vastly
1062 -- reduce the possiblility of shadowing
1063 -- Reason: see Note [Shadowing] in SpecConstr.lhs
1065 runWhen spec_constr CoreDoSpecConstr,
1069 -- Final clean-up simplification:
1070 simpl_phase 0 ["final"] max_iter
1073 -- -----------------------------------------------------------------------------
1074 -- StgToDo: abstraction of stg-to-stg passes to run.
1077 = StgDoMassageForProfiling -- should be (next to) last
1078 -- There's also setStgVarInfo, but its absolute "lastness"
1079 -- is so critical that it is hardwired in (no flag).
1082 getStgToDo :: DynFlags -> [StgToDo]
1084 | Just todo <- stgToDo dflags = todo -- set explicitly by user
1087 stg_stats = dopt Opt_StgStats dflags
1089 todo1 = if stg_stats then [D_stg_stats] else []
1091 todo2 | WayProf `elem` wayNames dflags
1092 = StgDoMassageForProfiling : todo1
1096 -- -----------------------------------------------------------------------------
1099 allFlags :: [String]
1100 allFlags = map ('-':) $
1101 [ flagName flag | flag <- dynamic_flags, ok (flagOptKind flag) ] ++
1102 map ("fno-"++) flags ++
1103 map ("f"++) flags ++
1104 map ("X"++) supportedLanguages ++
1105 map ("XNo"++) supportedLanguages
1106 where ok (PrefixPred _ _) = False
1108 flags = [ name | (name, _, _) <- fFlags ]
1110 dynamic_flags :: [Flag DynP]
1112 Flag "n" (NoArg (setDynFlag Opt_DryRun)) Supported
1113 , Flag "cpp" (NoArg (setDynFlag Opt_Cpp)) Supported
1114 , Flag "F" (NoArg (setDynFlag Opt_Pp)) Supported
1115 , Flag "#include" (HasArg (addCmdlineHCInclude)) Supported
1116 , Flag "v" (OptIntSuffix setVerbosity) Supported
1118 ------- Specific phases --------------------------------------------
1119 , Flag "pgmL" (HasArg (upd . setPgmL)) Supported
1120 , Flag "pgmP" (HasArg (upd . setPgmP)) Supported
1121 , Flag "pgmF" (HasArg (upd . setPgmF)) Supported
1122 , Flag "pgmc" (HasArg (upd . setPgmc)) Supported
1123 , Flag "pgmm" (HasArg (upd . setPgmm)) Supported
1124 , Flag "pgms" (HasArg (upd . setPgms)) Supported
1125 , Flag "pgma" (HasArg (upd . setPgma)) Supported
1126 , Flag "pgml" (HasArg (upd . setPgml)) Supported
1127 , Flag "pgmdll" (HasArg (upd . setPgmdll)) Supported
1128 , Flag "pgmwindres" (HasArg (upd . setPgmwindres)) Supported
1130 , Flag "optL" (HasArg (upd . addOptL)) Supported
1131 , Flag "optP" (HasArg (upd . addOptP)) Supported
1132 , Flag "optF" (HasArg (upd . addOptF)) Supported
1133 , Flag "optc" (HasArg (upd . addOptc)) Supported
1134 , Flag "optm" (HasArg (upd . addOptm)) Supported
1135 , Flag "opta" (HasArg (upd . addOpta)) Supported
1136 , Flag "optl" (HasArg (upd . addOptl)) Supported
1137 , Flag "optwindres" (HasArg (upd . addOptwindres)) Supported
1140 (NoArg (if can_split then setDynFlag Opt_SplitObjs else return ()))
1143 -------- ghc -M -----------------------------------------------------
1144 , Flag "dep-suffix" (HasArg (upd . addDepSuffix)) Supported
1145 , Flag "optdep-s" (HasArg (upd . addDepSuffix))
1146 (Deprecated "Use -dep-suffix instead")
1147 , Flag "dep-makefile" (HasArg (upd . setDepMakefile)) Supported
1148 , Flag "optdep-f" (HasArg (upd . setDepMakefile))
1149 (Deprecated "Use -dep-makefile instead")
1150 , Flag "optdep-w" (NoArg (upd (setDepWarnings False)))
1151 (Deprecated "-optdep-w doesn't do anything")
1152 , Flag "include-pkg-deps" (NoArg (upd (setDepIncludePkgDeps True))) Supported
1153 , Flag "optdep--include-prelude" (NoArg (upd (setDepIncludePkgDeps True)))
1154 (Deprecated "Use -include-pkg-deps instead")
1155 , Flag "optdep--include-pkg-deps" (NoArg (upd (setDepIncludePkgDeps True)))
1156 (Deprecated "Use -include-pkg-deps instead")
1157 , Flag "exclude-module" (HasArg (upd . addDepExcludeMod)) Supported
1158 , Flag "optdep--exclude-module" (HasArg (upd . addDepExcludeMod))
1159 (Deprecated "Use -exclude-module instead")
1160 , Flag "optdep-x" (HasArg (upd . addDepExcludeMod))
1161 (Deprecated "Use -exclude-module instead")
1163 -------- Linking ----------------------------------------------------
1164 , Flag "c" (NoArg (upd $ \d -> d{ ghcLink=NoLink } ))
1166 , Flag "no-link" (NoArg (upd $ \d -> d{ ghcLink=NoLink } ))
1167 (Deprecated "Use -c instead")
1168 , Flag "shared" (NoArg (upd $ \d -> d{ ghcLink=LinkDynLib } ))
1170 , Flag "dynload" (HasArg (upd . parseDynLibLoaderMode))
1173 ------- Libraries ---------------------------------------------------
1174 , Flag "L" (Prefix addLibraryPath ) Supported
1175 , Flag "l" (AnySuffix (\s -> do upd (addOptl s))) Supported
1177 ------- Frameworks --------------------------------------------------
1178 -- -framework-path should really be -F ...
1179 , Flag "framework-path" (HasArg addFrameworkPath ) Supported
1180 , Flag "framework" (HasArg (upd . addCmdlineFramework)) Supported
1182 ------- Output Redirection ------------------------------------------
1183 , Flag "odir" (HasArg (upd . setObjectDir)) Supported
1184 , Flag "o" (SepArg (upd . setOutputFile . Just)) Supported
1185 , Flag "ohi" (HasArg (upd . setOutputHi . Just )) Supported
1186 , Flag "osuf" (HasArg (upd . setObjectSuf)) Supported
1187 , Flag "hcsuf" (HasArg (upd . setHcSuf)) Supported
1188 , Flag "hisuf" (HasArg (upd . setHiSuf)) Supported
1189 , Flag "hidir" (HasArg (upd . setHiDir)) Supported
1190 , Flag "tmpdir" (HasArg (upd . setTmpDir)) Supported
1191 , Flag "stubdir" (HasArg (upd . setStubDir)) Supported
1192 , Flag "ddump-file-prefix" (HasArg (upd . setDumpPrefixForce . Just))
1195 ------- Keeping temporary files -------------------------------------
1196 -- These can be singular (think ghc -c) or plural (think ghc --make)
1197 , Flag "keep-hc-file" (NoArg (setDynFlag Opt_KeepHcFiles)) Supported
1198 , Flag "keep-hc-files" (NoArg (setDynFlag Opt_KeepHcFiles)) Supported
1199 , Flag "keep-s-file" (NoArg (setDynFlag Opt_KeepSFiles)) Supported
1200 , Flag "keep-s-files" (NoArg (setDynFlag Opt_KeepSFiles)) Supported
1201 , Flag "keep-raw-s-file" (NoArg (setDynFlag Opt_KeepRawSFiles)) Supported
1202 , Flag "keep-raw-s-files" (NoArg (setDynFlag Opt_KeepRawSFiles)) Supported
1203 -- This only makes sense as plural
1204 , Flag "keep-tmp-files" (NoArg (setDynFlag Opt_KeepTmpFiles)) Supported
1206 ------- Miscellaneous ----------------------------------------------
1207 , Flag "no-auto-link-packages" (NoArg (unSetDynFlag Opt_AutoLinkPackages)) Supported
1208 , Flag "no-hs-main" (NoArg (setDynFlag Opt_NoHsMain)) Supported
1209 , Flag "main-is" (SepArg setMainIs ) Supported
1210 , Flag "haddock" (NoArg (setDynFlag Opt_Haddock)) Supported
1211 , Flag "haddock-opts" (HasArg (upd . addHaddockOpts)) Supported
1212 , Flag "hpcdir" (SepArg setOptHpcDir) Supported
1214 ------- recompilation checker --------------------------------------
1215 , Flag "recomp" (NoArg (unSetDynFlag Opt_ForceRecomp))
1216 (Deprecated "Use -fno-force-recomp instead")
1217 , Flag "no-recomp" (NoArg (setDynFlag Opt_ForceRecomp))
1218 (Deprecated "Use -fforce-recomp instead")
1220 ------- Packages ----------------------------------------------------
1221 , Flag "package-conf" (HasArg extraPkgConf_) Supported
1222 , Flag "no-user-package-conf" (NoArg (unSetDynFlag Opt_ReadUserPackageConf))
1224 , Flag "package-name" (HasArg (upd . setPackageName)) Supported
1225 , Flag "package" (HasArg exposePackage) Supported
1226 , Flag "hide-package" (HasArg hidePackage) Supported
1227 , Flag "hide-all-packages" (NoArg (setDynFlag Opt_HideAllPackages))
1229 , Flag "ignore-package" (HasArg ignorePackage)
1231 , Flag "syslib" (HasArg exposePackage)
1232 (Deprecated "Use -package instead")
1234 ------ HsCpp opts ---------------------------------------------------
1235 , Flag "D" (AnySuffix (upd . addOptP)) Supported
1236 , Flag "U" (AnySuffix (upd . addOptP)) Supported
1238 ------- Include/Import Paths ----------------------------------------
1239 , Flag "I" (Prefix addIncludePath) Supported
1240 , Flag "i" (OptPrefix addImportPath ) Supported
1242 ------ Debugging ----------------------------------------------------
1243 , Flag "dstg-stats" (NoArg (setDynFlag Opt_StgStats)) Supported
1245 , Flag "ddump-cmm" (setDumpFlag Opt_D_dump_cmm)
1247 , Flag "ddump-cmmz" (setDumpFlag Opt_D_dump_cmmz)
1249 , Flag "ddump-cmmz-pretty" (setDumpFlag Opt_D_dump_cmmz_pretty)
1251 , Flag "ddump-cps-cmm" (setDumpFlag Opt_D_dump_cps_cmm)
1253 , Flag "ddump-cvt-cmm" (setDumpFlag Opt_D_dump_cvt_cmm)
1255 , Flag "ddump-asm" (setDumpFlag Opt_D_dump_asm)
1257 , Flag "ddump-asm-native" (setDumpFlag Opt_D_dump_asm_native)
1259 , Flag "ddump-asm-liveness" (setDumpFlag Opt_D_dump_asm_liveness)
1261 , Flag "ddump-asm-coalesce" (setDumpFlag Opt_D_dump_asm_coalesce)
1263 , Flag "ddump-asm-regalloc" (setDumpFlag Opt_D_dump_asm_regalloc)
1265 , Flag "ddump-asm-conflicts" (setDumpFlag Opt_D_dump_asm_conflicts)
1267 , Flag "ddump-asm-regalloc-stages"
1268 (setDumpFlag Opt_D_dump_asm_regalloc_stages)
1270 , Flag "ddump-asm-stats" (setDumpFlag Opt_D_dump_asm_stats)
1272 , Flag "ddump-cpranal" (setDumpFlag Opt_D_dump_cpranal)
1274 , Flag "ddump-deriv" (setDumpFlag Opt_D_dump_deriv)
1276 , Flag "ddump-ds" (setDumpFlag Opt_D_dump_ds)
1278 , Flag "ddump-flatC" (setDumpFlag Opt_D_dump_flatC)
1280 , Flag "ddump-foreign" (setDumpFlag Opt_D_dump_foreign)
1282 , Flag "ddump-inlinings" (setDumpFlag Opt_D_dump_inlinings)
1284 , Flag "ddump-rule-firings" (setDumpFlag Opt_D_dump_rule_firings)
1286 , Flag "ddump-occur-anal" (setDumpFlag Opt_D_dump_occur_anal)
1288 , Flag "ddump-parsed" (setDumpFlag Opt_D_dump_parsed)
1290 , Flag "ddump-rn" (setDumpFlag Opt_D_dump_rn)
1292 , Flag "ddump-simpl" (setDumpFlag Opt_D_dump_simpl)
1294 , Flag "ddump-simpl-iterations" (setDumpFlag Opt_D_dump_simpl_iterations)
1296 , Flag "ddump-simpl-phases" (OptPrefix setDumpSimplPhases)
1298 , Flag "ddump-spec" (setDumpFlag Opt_D_dump_spec)
1300 , Flag "ddump-prep" (setDumpFlag Opt_D_dump_prep)
1302 , Flag "ddump-stg" (setDumpFlag Opt_D_dump_stg)
1304 , Flag "ddump-stranal" (setDumpFlag Opt_D_dump_stranal)
1306 , Flag "ddump-tc" (setDumpFlag Opt_D_dump_tc)
1308 , Flag "ddump-types" (setDumpFlag Opt_D_dump_types)
1310 , Flag "ddump-rules" (setDumpFlag Opt_D_dump_rules)
1312 , Flag "ddump-cse" (setDumpFlag Opt_D_dump_cse)
1314 , Flag "ddump-worker-wrapper" (setDumpFlag Opt_D_dump_worker_wrapper)
1316 , Flag "ddump-rn-trace" (setDumpFlag Opt_D_dump_rn_trace)
1318 , Flag "ddump-if-trace" (setDumpFlag Opt_D_dump_if_trace)
1320 , Flag "ddump-tc-trace" (setDumpFlag Opt_D_dump_tc_trace)
1322 , Flag "ddump-splices" (setDumpFlag Opt_D_dump_splices)
1324 , Flag "ddump-rn-stats" (setDumpFlag Opt_D_dump_rn_stats)
1326 , Flag "ddump-opt-cmm" (setDumpFlag Opt_D_dump_opt_cmm)
1328 , Flag "ddump-simpl-stats" (setDumpFlag Opt_D_dump_simpl_stats)
1330 , Flag "ddump-bcos" (setDumpFlag Opt_D_dump_BCOs)
1332 , Flag "dsource-stats" (setDumpFlag Opt_D_source_stats)
1334 , Flag "dverbose-core2core" (NoArg setVerboseCore2Core)
1336 , Flag "dverbose-stg2stg" (setDumpFlag Opt_D_verbose_stg2stg)
1338 , Flag "ddump-hi" (setDumpFlag Opt_D_dump_hi)
1340 , Flag "ddump-minimal-imports" (setDumpFlag Opt_D_dump_minimal_imports)
1342 , Flag "ddump-vect" (setDumpFlag Opt_D_dump_vect)
1344 , Flag "ddump-hpc" (setDumpFlag Opt_D_dump_hpc)
1346 , Flag "ddump-mod-cycles" (setDumpFlag Opt_D_dump_mod_cycles)
1348 , Flag "ddump-view-pattern-commoning" (setDumpFlag Opt_D_dump_view_pattern_commoning)
1350 , Flag "ddump-to-file" (setDumpFlag Opt_DumpToFile)
1352 , Flag "ddump-hi-diffs" (setDumpFlag Opt_D_dump_hi_diffs)
1355 , Flag "dcore-lint" (NoArg (setDynFlag Opt_DoCoreLinting))
1357 , Flag "dstg-lint" (NoArg (setDynFlag Opt_DoStgLinting))
1359 , Flag "dcmm-lint" (NoArg (setDynFlag Opt_DoCmmLinting))
1361 , Flag "dasm-lint" (NoArg (setDynFlag Opt_DoAsmLinting))
1363 , Flag "dshow-passes"
1364 (NoArg (do setDynFlag Opt_ForceRecomp
1365 setVerbosity (Just 2)))
1367 , Flag "dfaststring-stats" (NoArg (setDynFlag Opt_D_faststring_stats))
1370 ------ Machine dependant (-m<blah>) stuff ---------------------------
1372 , Flag "monly-2-regs" (NoArg (upd (\s -> s{stolen_x86_regs = 2}) ))
1374 , Flag "monly-3-regs" (NoArg (upd (\s -> s{stolen_x86_regs = 3}) ))
1376 , Flag "monly-4-regs" (NoArg (upd (\s -> s{stolen_x86_regs = 4}) ))
1379 ------ Warning opts -------------------------------------------------
1380 , Flag "W" (NoArg (mapM_ setDynFlag minusWOpts))
1382 , Flag "Werror" (NoArg (setDynFlag Opt_WarnIsError))
1384 , Flag "Wwarn" (NoArg (unSetDynFlag Opt_WarnIsError))
1386 , Flag "Wall" (NoArg (mapM_ setDynFlag minusWallOpts))
1388 , Flag "Wnot" (NoArg (mapM_ unSetDynFlag minusWallOpts))
1389 (Deprecated "Use -w instead")
1390 , Flag "w" (NoArg (mapM_ unSetDynFlag minuswRemovesOpts))
1393 ------ Optimisation flags ------------------------------------------
1394 , Flag "O" (NoArg (upd (setOptLevel 1))) Supported
1395 , Flag "Onot" (NoArg (upd (setOptLevel 0)))
1396 (Deprecated "Use -O0 instead")
1397 , Flag "Odph" (NoArg (upd setDPHOpt)) Supported
1398 , Flag "O" (OptIntSuffix (\mb_n -> upd (setOptLevel (mb_n `orElse` 1))))
1400 -- If the number is missing, use 1
1402 , Flag "fsimplifier-phases"
1403 (IntSuffix (\n -> upd (\dfs -> dfs{ simplPhases = n })))
1405 , Flag "fmax-simplifier-iterations"
1406 (IntSuffix (\n -> upd (\dfs -> dfs{ maxSimplIterations = n })))
1409 , Flag "fspec-constr-threshold"
1410 (IntSuffix (\n -> upd (\dfs -> dfs{ specConstrThreshold = Just n })))
1412 , Flag "fno-spec-constr-threshold"
1413 (NoArg (upd (\dfs -> dfs{ specConstrThreshold = Nothing })))
1415 , Flag "fspec-constr-count"
1416 (IntSuffix (\n -> upd (\dfs -> dfs{ specConstrCount = Just n })))
1418 , Flag "fno-spec-constr-count"
1419 (NoArg (upd (\dfs -> dfs{ specConstrCount = Nothing })))
1421 , Flag "fliberate-case-threshold"
1422 (IntSuffix (\n -> upd (\dfs -> dfs{ liberateCaseThreshold = Just n })))
1424 , Flag "fno-liberate-case-threshold"
1425 (NoArg (upd (\dfs -> dfs{ liberateCaseThreshold = Nothing })))
1428 , Flag "frule-check"
1429 (SepArg (\s -> upd (\dfs -> dfs{ ruleCheck = Just s })))
1431 , Flag "fcontext-stack"
1432 (IntSuffix $ \n -> upd $ \dfs -> dfs{ ctxtStkDepth = n })
1435 ------ DPH flags ----------------------------------------------------
1438 (NoArg (setDPHBackend DPHSeq))
1441 (NoArg (setDPHBackend DPHPar))
1444 ------ Compiler flags -----------------------------------------------
1446 , Flag "fasm" (NoArg (setObjTarget HscAsm)) Supported
1447 , Flag "fvia-c" (NoArg (setObjTarget HscC)) Supported
1448 , Flag "fvia-C" (NoArg (setObjTarget HscC)) Supported
1450 , Flag "fno-code" (NoArg (setTarget HscNothing)) Supported
1451 , Flag "fbyte-code" (NoArg (setTarget HscInterpreted)) Supported
1452 , Flag "fobject-code" (NoArg (setTarget defaultHscTarget)) Supported
1454 , Flag "fglasgow-exts" (NoArg (mapM_ setDynFlag glasgowExtsFlags))
1456 , Flag "fno-glasgow-exts" (NoArg (mapM_ unSetDynFlag glasgowExtsFlags))
1459 ++ map (mkFlag True "f" setDynFlag ) fFlags
1460 ++ map (mkFlag False "fno-" unSetDynFlag) fFlags
1461 ++ map (mkFlag True "X" setDynFlag ) xFlags
1462 ++ map (mkFlag False "XNo" unSetDynFlag) xFlags
1464 mkFlag :: Bool -- ^ True <=> it should be turned on
1465 -> String -- ^ The flag prefix
1466 -> (DynFlag -> DynP ())
1467 -> (String, DynFlag, Bool -> Deprecated)
1469 mkFlag turnOn flagPrefix f (name, dynflag, deprecated)
1470 = Flag (flagPrefix ++ name) (NoArg (f dynflag)) (deprecated turnOn)
1472 deprecatedForLanguage :: String -> Bool -> Deprecated
1473 deprecatedForLanguage lang turn_on
1474 = Deprecated ("use -X" ++ flag ++ " or pragma {-# LANGUAGE " ++ flag ++ "#-} instead")
1476 flag | turn_on = lang
1477 | otherwise = "No"++lang
1479 useInstead :: String -> Bool -> Deprecated
1480 useInstead flag turn_on
1481 = Deprecated ("Use -f" ++ no ++ flag ++ " instead")
1483 no = if turn_on then "" else "no-"
1485 -- | These @-f\<blah\>@ flags can all be reversed with @-fno-\<blah\>@
1486 fFlags :: [(String, DynFlag, Bool -> Deprecated)]
1488 ( "warn-dodgy-foreign-imports", Opt_WarnDodgyForeignImports, const Supported ),
1489 ( "warn-dodgy-imports", Opt_WarnDodgyImports, const Supported ),
1490 ( "warn-duplicate-exports", Opt_WarnDuplicateExports, const Supported ),
1491 ( "warn-hi-shadowing", Opt_WarnHiShadows, const Supported ),
1492 ( "warn-implicit-prelude", Opt_WarnImplicitPrelude, const Supported ),
1493 ( "warn-incomplete-patterns", Opt_WarnIncompletePatterns, const Supported ),
1494 ( "warn-incomplete-record-updates", Opt_WarnIncompletePatternsRecUpd, const Supported ),
1495 ( "warn-missing-fields", Opt_WarnMissingFields, const Supported ),
1496 ( "warn-missing-methods", Opt_WarnMissingMethods, const Supported ),
1497 ( "warn-missing-signatures", Opt_WarnMissingSigs, const Supported ),
1498 ( "warn-name-shadowing", Opt_WarnNameShadowing, const Supported ),
1499 ( "warn-overlapping-patterns", Opt_WarnOverlappingPatterns, const Supported ),
1500 ( "warn-simple-patterns", Opt_WarnSimplePatterns, const Supported ),
1501 ( "warn-type-defaults", Opt_WarnTypeDefaults, const Supported ),
1502 ( "warn-monomorphism-restriction", Opt_WarnMonomorphism, const Supported ),
1503 ( "warn-unused-binds", Opt_WarnUnusedBinds, const Supported ),
1504 ( "warn-unused-imports", Opt_WarnUnusedImports, const Supported ),
1505 ( "warn-unused-matches", Opt_WarnUnusedMatches, const Supported ),
1506 ( "warn-warnings-deprecations", Opt_WarnWarningsDeprecations, const Supported ),
1507 ( "warn-deprecations", Opt_WarnWarningsDeprecations, const Supported ),
1508 ( "warn-deprecated-flags", Opt_WarnDeprecatedFlags, const Supported ),
1509 ( "warn-orphans", Opt_WarnOrphans, const Supported ),
1510 ( "warn-tabs", Opt_WarnTabs, const Supported ),
1511 ( "warn-unrecognised-pragmas", Opt_WarnUnrecognisedPragmas, const Supported ),
1512 ( "print-explicit-foralls", Opt_PrintExplicitForalls, const Supported ),
1513 ( "strictness", Opt_Strictness, const Supported ),
1514 ( "static-argument-transformation", Opt_StaticArgumentTransformation, const Supported ),
1515 ( "full-laziness", Opt_FullLaziness, const Supported ),
1516 ( "liberate-case", Opt_LiberateCase, const Supported ),
1517 ( "spec-constr", Opt_SpecConstr, const Supported ),
1518 ( "cse", Opt_CSE, const Supported ),
1519 ( "ignore-interface-pragmas", Opt_IgnoreInterfacePragmas, const Supported ),
1520 ( "omit-interface-pragmas", Opt_OmitInterfacePragmas, const Supported ),
1521 ( "do-lambda-eta-expansion", Opt_DoLambdaEtaExpansion, const Supported ),
1522 ( "ignore-asserts", Opt_IgnoreAsserts, const Supported ),
1523 ( "do-eta-reduction", Opt_DoEtaReduction, const Supported ),
1524 ( "case-merge", Opt_CaseMerge, const Supported ),
1525 ( "unbox-strict-fields", Opt_UnboxStrictFields, const Supported ),
1526 ( "method-sharing", Opt_MethodSharing, const Supported ),
1527 ( "dicts-cheap", Opt_DictsCheap, const Supported ),
1528 ( "excess-precision", Opt_ExcessPrecision, const Supported ),
1529 ( "asm-mangling", Opt_DoAsmMangling, const Supported ),
1530 ( "print-bind-result", Opt_PrintBindResult, const Supported ),
1531 ( "force-recomp", Opt_ForceRecomp, const Supported ),
1532 ( "hpc-no-auto", Opt_Hpc_No_Auto, const Supported ),
1533 ( "rewrite-rules", Opt_EnableRewriteRules, useInstead "enable-rewrite-rules" ),
1534 ( "enable-rewrite-rules", Opt_EnableRewriteRules, const Supported ),
1535 ( "break-on-exception", Opt_BreakOnException, const Supported ),
1536 ( "break-on-error", Opt_BreakOnError, const Supported ),
1537 ( "print-evld-with-show", Opt_PrintEvldWithShow, const Supported ),
1538 ( "print-bind-contents", Opt_PrintBindContents, const Supported ),
1539 ( "run-cps", Opt_RunCPSZ, const Supported ),
1540 ( "convert-to-zipper-and-back", Opt_ConvertToZipCfgAndBack, const Supported ),
1541 ( "vectorise", Opt_Vectorise, const Supported ),
1542 ( "regs-graph", Opt_RegsGraph, const Supported ),
1543 ( "regs-iterative", Opt_RegsIterative, const Supported ),
1544 ( "th", Opt_TemplateHaskell,
1545 deprecatedForLanguage "TemplateHaskell" ),
1546 ( "fi", Opt_ForeignFunctionInterface,
1547 deprecatedForLanguage "ForeignFunctionInterface" ),
1548 ( "ffi", Opt_ForeignFunctionInterface,
1549 deprecatedForLanguage "ForeignFunctionInterface" ),
1550 ( "arrows", Opt_Arrows,
1551 deprecatedForLanguage "Arrows" ),
1552 ( "generics", Opt_Generics,
1553 deprecatedForLanguage "Generics" ),
1554 ( "implicit-prelude", Opt_ImplicitPrelude,
1555 deprecatedForLanguage "ImplicitPrelude" ),
1556 ( "bang-patterns", Opt_BangPatterns,
1557 deprecatedForLanguage "BangPatterns" ),
1558 ( "monomorphism-restriction", Opt_MonomorphismRestriction,
1559 deprecatedForLanguage "MonomorphismRestriction" ),
1560 ( "mono-pat-binds", Opt_MonoPatBinds,
1561 deprecatedForLanguage "MonoPatBinds" ),
1562 ( "extended-default-rules", Opt_ExtendedDefaultRules,
1563 deprecatedForLanguage "ExtendedDefaultRules" ),
1564 ( "implicit-params", Opt_ImplicitParams,
1565 deprecatedForLanguage "ImplicitParams" ),
1566 ( "scoped-type-variables", Opt_ScopedTypeVariables,
1567 deprecatedForLanguage "ScopedTypeVariables" ),
1569 deprecatedForLanguage "PArr" ),
1570 ( "allow-overlapping-instances", Opt_OverlappingInstances,
1571 deprecatedForLanguage "OverlappingInstances" ),
1572 ( "allow-undecidable-instances", Opt_UndecidableInstances,
1573 deprecatedForLanguage "UndecidableInstances" ),
1574 ( "allow-incoherent-instances", Opt_IncoherentInstances,
1575 deprecatedForLanguage "IncoherentInstances" ),
1576 ( "gen-manifest", Opt_GenManifest, const Supported ),
1577 ( "embed-manifest", Opt_EmbedManifest, const Supported ),
1578 ( "implicit-import-qualified", Opt_ImplicitImportQualified, const Supported )
1581 supportedLanguages :: [String]
1582 supportedLanguages = [ name | (name, _, _) <- xFlags ]
1584 -- This may contain duplicates
1585 languageOptions :: [DynFlag]
1586 languageOptions = [ dynFlag | (_, dynFlag, _) <- xFlags ]
1588 -- | These -X<blah> flags can all be reversed with -XNo<blah>
1589 xFlags :: [(String, DynFlag, Bool -> Deprecated)]
1591 ( "CPP", Opt_Cpp, const Supported ),
1592 ( "PostfixOperators", Opt_PostfixOperators, const Supported ),
1593 ( "PatternGuards", Opt_PatternGuards, const Supported ),
1594 ( "UnicodeSyntax", Opt_UnicodeSyntax, const Supported ),
1595 ( "MagicHash", Opt_MagicHash, const Supported ),
1596 ( "PolymorphicComponents", Opt_PolymorphicComponents, const Supported ),
1597 ( "ExistentialQuantification", Opt_ExistentialQuantification, const Supported ),
1598 ( "KindSignatures", Opt_KindSignatures, const Supported ),
1599 ( "EmptyDataDecls", Opt_EmptyDataDecls, const Supported ),
1600 ( "ParallelListComp", Opt_ParallelListComp, const Supported ),
1601 ( "TransformListComp", Opt_TransformListComp, const Supported ),
1602 ( "ForeignFunctionInterface", Opt_ForeignFunctionInterface, const Supported ),
1603 ( "UnliftedFFITypes", Opt_UnliftedFFITypes, const Supported ),
1604 ( "LiberalTypeSynonyms", Opt_LiberalTypeSynonyms, const Supported ),
1605 ( "Rank2Types", Opt_Rank2Types, const Supported ),
1606 ( "RankNTypes", Opt_RankNTypes, const Supported ),
1607 ( "ImpredicativeTypes", Opt_ImpredicativeTypes, const Supported ),
1608 ( "TypeOperators", Opt_TypeOperators, const Supported ),
1609 ( "RecursiveDo", Opt_RecursiveDo, const Supported ),
1610 ( "Arrows", Opt_Arrows, const Supported ),
1611 ( "PArr", Opt_PArr, const Supported ),
1612 ( "TemplateHaskell", Opt_TemplateHaskell, const Supported ),
1613 ( "QuasiQuotes", Opt_QuasiQuotes, const Supported ),
1614 ( "Generics", Opt_Generics, const Supported ),
1616 ( "ImplicitPrelude", Opt_ImplicitPrelude, const Supported ),
1617 ( "RecordWildCards", Opt_RecordWildCards, const Supported ),
1618 ( "NamedFieldPuns", Opt_RecordPuns, const Supported ),
1619 ( "RecordPuns", Opt_RecordPuns,
1620 deprecatedForLanguage "NamedFieldPuns" ),
1621 ( "DisambiguateRecordFields", Opt_DisambiguateRecordFields, const Supported ),
1622 ( "OverloadedStrings", Opt_OverloadedStrings, const Supported ),
1623 ( "GADTs", Opt_GADTs, const Supported ),
1624 ( "ViewPatterns", Opt_ViewPatterns, const Supported ),
1625 ( "TypeFamilies", Opt_TypeFamilies, const Supported ),
1626 ( "BangPatterns", Opt_BangPatterns, const Supported ),
1628 ( "MonomorphismRestriction", Opt_MonomorphismRestriction, const Supported ),
1629 -- On by default (which is not strictly H98):
1630 ( "MonoPatBinds", Opt_MonoPatBinds, const Supported ),
1631 ( "RelaxedPolyRec", Opt_RelaxedPolyRec, const Supported ),
1632 ( "ExtendedDefaultRules", Opt_ExtendedDefaultRules, const Supported ),
1633 ( "ImplicitParams", Opt_ImplicitParams, const Supported ),
1634 ( "ScopedTypeVariables", Opt_ScopedTypeVariables, const Supported ),
1636 ( "PatternSignatures", Opt_ScopedTypeVariables,
1637 deprecatedForLanguage "ScopedTypeVariables" ),
1639 ( "UnboxedTuples", Opt_UnboxedTuples, const Supported ),
1640 ( "StandaloneDeriving", Opt_StandaloneDeriving, const Supported ),
1641 ( "DeriveDataTypeable", Opt_DeriveDataTypeable, const Supported ),
1642 ( "TypeSynonymInstances", Opt_TypeSynonymInstances, const Supported ),
1643 ( "FlexibleContexts", Opt_FlexibleContexts, const Supported ),
1644 ( "FlexibleInstances", Opt_FlexibleInstances, const Supported ),
1645 ( "ConstrainedClassMethods", Opt_ConstrainedClassMethods, const Supported ),
1646 ( "MultiParamTypeClasses", Opt_MultiParamTypeClasses, const Supported ),
1647 ( "FunctionalDependencies", Opt_FunctionalDependencies, const Supported ),
1648 ( "GeneralizedNewtypeDeriving", Opt_GeneralizedNewtypeDeriving, const Supported ),
1649 ( "OverlappingInstances", Opt_OverlappingInstances, const Supported ),
1650 ( "UndecidableInstances", Opt_UndecidableInstances, const Supported ),
1651 ( "IncoherentInstances", Opt_IncoherentInstances, const Supported ),
1652 ( "PackageImports", Opt_PackageImports, const Supported )
1655 impliedFlags :: [(DynFlag, DynFlag)]
1657 = [ (Opt_GADTs, Opt_RelaxedPolyRec) -- We want type-sig variables to
1658 -- be completely rigid for GADTs
1660 , (Opt_ScopedTypeVariables, Opt_RelaxedPolyRec) -- Ditto for scoped type variables; see
1661 -- Note [Scoped tyvars] in TcBinds
1664 glasgowExtsFlags :: [DynFlag]
1665 glasgowExtsFlags = [
1666 Opt_PrintExplicitForalls
1667 , Opt_ForeignFunctionInterface
1668 , Opt_UnliftedFFITypes
1670 , Opt_ImplicitParams
1671 , Opt_ScopedTypeVariables
1673 , Opt_TypeSynonymInstances
1674 , Opt_StandaloneDeriving
1675 , Opt_DeriveDataTypeable
1676 , Opt_FlexibleContexts
1677 , Opt_FlexibleInstances
1678 , Opt_ConstrainedClassMethods
1679 , Opt_MultiParamTypeClasses
1680 , Opt_FunctionalDependencies
1682 , Opt_PolymorphicComponents
1683 , Opt_ExistentialQuantification
1685 , Opt_PostfixOperators
1687 , Opt_LiberalTypeSynonyms
1689 , Opt_ImpredicativeTypes
1692 , Opt_ParallelListComp
1693 , Opt_EmptyDataDecls
1694 , Opt_KindSignatures
1695 , Opt_GeneralizedNewtypeDeriving
1696 , Opt_TypeFamilies ]
1698 -- -----------------------------------------------------------------------------
1699 -- Parsing the dynamic flags.
1701 -- | Parse dynamic flags from a list of command line argument. Returns the
1702 -- the parsed 'DynFlags', the left-over arguments, and a list of warnings.
1703 -- Throws a 'UsageError' if errors occurred during parsing (such as unknown
1704 -- flags or missing arguments).
1705 parseDynamicFlags :: Monad m =>
1706 DynFlags -> [Located String]
1707 -> m (DynFlags, [Located String], [Located String])
1708 -- ^ Updated 'DynFlags', left-over arguments, and
1709 -- list of warnings.
1710 parseDynamicFlags dflags args = do
1711 -- XXX Legacy support code
1712 -- We used to accept things like
1713 -- optdep-f -optdepdepend
1714 -- optdep-f -optdep depend
1715 -- optdep -f -optdepdepend
1716 -- optdep -f -optdep depend
1717 -- but the spaces trip up proper argument handling. So get rid of them.
1718 let f (L p "-optdep" : L _ x : xs) = (L p ("-optdep" ++ x)) : f xs
1719 f (x : xs) = x : f xs
1722 let ((leftover, errs, warns), dflags')
1723 = runCmdLine (processArgs dynamic_flags args') dflags
1724 when (not (null errs)) $ ghcError $ errorsToGhcException errs
1725 return (dflags', leftover, warns)
1727 type DynP = CmdLineP DynFlags
1729 upd :: (DynFlags -> DynFlags) -> DynP ()
1731 dfs <- getCmdLineState
1732 putCmdLineState $! (f dfs)
1734 --------------------------
1735 setDynFlag, unSetDynFlag :: DynFlag -> DynP ()
1736 setDynFlag f = do { upd (\dfs -> dopt_set dfs f)
1737 ; mapM_ setDynFlag deps }
1739 deps = [ d | (f', d) <- impliedFlags, f' == f ]
1740 -- When you set f, set the ones it implies
1741 -- NB: use setDynFlag recursively, in case the implied flags
1742 -- implies further flags
1743 -- When you un-set f, however, we don't un-set the things it implies
1744 -- (except for -fno-glasgow-exts, which is treated specially)
1746 unSetDynFlag f = upd (\dfs -> dopt_unset dfs f)
1748 --------------------------
1749 setDumpFlag :: DynFlag -> OptKind DynP
1750 setDumpFlag dump_flag
1751 | force_recomp = NoArg (setDynFlag Opt_ForceRecomp >> setDynFlag dump_flag)
1752 | otherwise = NoArg (setDynFlag dump_flag)
1754 -- Whenver we -ddump, switch off the recompilation checker,
1755 -- else you don't see the dump!
1756 -- However, certain dumpy-things are really interested in what's going
1757 -- on during recompilation checking, so in those cases we
1758 -- don't want to turn it off.
1759 force_recomp = dump_flag `notElem` [Opt_D_dump_if_trace,
1760 Opt_D_dump_hi_diffs]
1762 setVerboseCore2Core :: DynP ()
1763 setVerboseCore2Core = do setDynFlag Opt_ForceRecomp
1764 setDynFlag Opt_D_verbose_core2core
1765 upd (\s -> s { shouldDumpSimplPhase = const True })
1767 setDumpSimplPhases :: String -> DynP ()
1768 setDumpSimplPhases s = do setDynFlag Opt_ForceRecomp
1769 upd (\s -> s { shouldDumpSimplPhase = spec })
1771 spec :: SimplifierMode -> Bool
1773 . map (join (&&) . map match . split ':')
1779 join :: (Bool -> Bool -> Bool)
1780 -> [SimplifierMode -> Bool]
1781 -> SimplifierMode -> Bool
1782 join _ [] = const True
1783 join op ss = foldr1 (\f g x -> f x `op` g x) ss
1785 match :: String -> SimplifierMode -> Bool
1786 match "" = const True
1787 match s = case reads s of
1788 [(n,"")] -> phase_num n
1791 phase_num :: Int -> SimplifierMode -> Bool
1792 phase_num n (SimplPhase k _) = n == k
1793 phase_num _ _ = False
1795 phase_name :: String -> SimplifierMode -> Bool
1796 phase_name s SimplGently = s == "gentle"
1797 phase_name s (SimplPhase _ ss) = s `elem` ss
1799 setVerbosity :: Maybe Int -> DynP ()
1800 setVerbosity mb_n = upd (\dfs -> dfs{ verbosity = mb_n `orElse` 3 })
1802 addCmdlineHCInclude :: String -> DynP ()
1803 addCmdlineHCInclude a = upd (\s -> s{cmdlineHcIncludes = a : cmdlineHcIncludes s})
1805 extraPkgConf_ :: FilePath -> DynP ()
1806 extraPkgConf_ p = upd (\s -> s{ extraPkgConfs = p : extraPkgConfs s })
1808 exposePackage, hidePackage, ignorePackage :: String -> DynP ()
1810 upd (\s -> s{ packageFlags = ExposePackage p : packageFlags s })
1812 upd (\s -> s{ packageFlags = HidePackage p : packageFlags s })
1814 upd (\s -> s{ packageFlags = IgnorePackage p : packageFlags s })
1816 setPackageName :: String -> DynFlags -> DynFlags
1818 | Nothing <- unpackPackageId pid
1819 = ghcError (CmdLineError ("cannot parse \'" ++ p ++ "\' as a package identifier"))
1821 = \s -> s{ thisPackage = pid }
1823 pid = stringToPackageId p
1825 -- If we're linking a binary, then only targets that produce object
1826 -- code are allowed (requests for other target types are ignored).
1827 setTarget :: HscTarget -> DynP ()
1828 setTarget l = upd set
1831 | ghcLink dfs /= LinkBinary || isObjectTarget l = dfs{ hscTarget = l }
1834 -- Changes the target only if we're compiling object code. This is
1835 -- used by -fasm and -fvia-C, which switch from one to the other, but
1836 -- not from bytecode to object-code. The idea is that -fasm/-fvia-C
1837 -- can be safely used in an OPTIONS_GHC pragma.
1838 setObjTarget :: HscTarget -> DynP ()
1839 setObjTarget l = upd set
1842 | isObjectTarget (hscTarget dfs) = dfs { hscTarget = l }
1845 setOptLevel :: Int -> DynFlags -> DynFlags
1846 setOptLevel n dflags
1847 | hscTarget dflags == HscInterpreted && n > 0
1849 -- not in IO any more, oh well:
1850 -- putStr "warning: -O conflicts with --interactive; -O ignored.\n"
1852 = updOptLevel n dflags
1855 -- -Odph is equivalent to
1857 -- -O2 optimise as much as possible
1858 -- -fno-method-sharing sharing specialisation defeats fusion
1860 -- -fdicts-cheap always inline dictionaries
1861 -- -fmax-simplifier-iterations20 this is necessary sometimes
1862 -- -fno-spec-constr-threshold run SpecConstr even for big loops
1863 -- -fno-spec-constr-count SpecConstr as much as possible
1865 setDPHOpt :: DynFlags -> DynFlags
1866 setDPHOpt dflags = setOptLevel 2 (dflags { maxSimplIterations = 20
1867 , specConstrThreshold = Nothing
1868 , specConstrCount = Nothing
1870 `dopt_set` Opt_DictsCheap
1871 `dopt_unset` Opt_MethodSharing
1873 data DPHBackend = DPHPar
1876 setDPHBackend :: DPHBackend -> DynP ()
1877 setDPHBackend backend
1879 upd $ \dflags -> dflags { dphBackend = backend }
1880 exposePackage $ "dph-prim-" ++ suffix backend
1881 exposePackage $ "dph-" ++ suffix backend
1883 suffix DPHPar = "par"
1884 suffix DPHSeq = "seq"
1886 setMainIs :: String -> DynP ()
1888 | not (null main_fn) && isLower (head main_fn)
1889 -- The arg looked like "Foo.Bar.baz"
1890 = upd $ \d -> d{ mainFunIs = Just main_fn,
1891 mainModIs = mkModule mainPackageId (mkModuleName main_mod) }
1893 | isUpper (head arg) -- The arg looked like "Foo" or "Foo.Bar"
1894 = upd $ \d -> d{ mainModIs = mkModule mainPackageId (mkModuleName arg) }
1896 | otherwise -- The arg looked like "baz"
1897 = upd $ \d -> d{ mainFunIs = Just arg }
1899 (main_mod, main_fn) = splitLongestPrefix arg (== '.')
1901 -- | Get the unqualified name of the function to use as the \"main\" for the main module.
1902 -- Either returns the default name or the one configured on the command line with -main-is
1903 getMainFun :: DynFlags -> RdrName
1904 getMainFun dflags = case (mainFunIs dflags) of
1905 Just fn -> mkRdrUnqual (mkVarOccFS (mkFastString fn))
1906 Nothing -> main_RDR_Unqual
1908 -----------------------------------------------------------------------------
1909 -- Paths & Libraries
1911 addImportPath, addLibraryPath, addIncludePath, addFrameworkPath :: FilePath -> DynP ()
1913 -- -i on its own deletes the import paths
1914 addImportPath "" = upd (\s -> s{importPaths = []})
1915 addImportPath p = upd (\s -> s{importPaths = importPaths s ++ splitPathList p})
1919 upd (\s -> s{libraryPaths = libraryPaths s ++ splitPathList p})
1922 upd (\s -> s{includePaths = includePaths s ++ splitPathList p})
1924 addFrameworkPath p =
1925 upd (\s -> s{frameworkPaths = frameworkPaths s ++ splitPathList p})
1927 #ifndef mingw32_TARGET_OS
1928 split_marker :: Char
1929 split_marker = ':' -- not configurable (ToDo)
1932 splitPathList :: String -> [String]
1933 splitPathList s = filter notNull (splitUp s)
1934 -- empty paths are ignored: there might be a trailing
1935 -- ':' in the initial list, for example. Empty paths can
1936 -- cause confusion when they are translated into -I options
1937 -- for passing to gcc.
1939 #ifndef mingw32_TARGET_OS
1940 splitUp xs = split split_marker xs
1942 -- Windows: 'hybrid' support for DOS-style paths in directory lists.
1944 -- That is, if "foo:bar:baz" is used, this interpreted as
1945 -- consisting of three entries, 'foo', 'bar', 'baz'.
1946 -- However, with "c:/foo:c:\\foo;x:/bar", this is interpreted
1947 -- as 3 elts, "c:/foo", "c:\\foo", "x:/bar"
1949 -- Notice that no attempt is made to fully replace the 'standard'
1950 -- split marker ':' with the Windows / DOS one, ';'. The reason being
1951 -- that this will cause too much breakage for users & ':' will
1952 -- work fine even with DOS paths, if you're not insisting on being silly.
1955 splitUp (x:':':div:xs) | div `elem` dir_markers
1956 = ((x:':':div:p): splitUp rs)
1958 (p,rs) = findNextPath xs
1959 -- we used to check for existence of the path here, but that
1960 -- required the IO monad to be threaded through the command-line
1961 -- parser which is quite inconvenient. The
1962 splitUp xs = cons p (splitUp rs)
1964 (p,rs) = findNextPath xs
1969 -- will be called either when we've consumed nought or the
1970 -- "<Drive>:/" part of a DOS path, so splitting is just a Q of
1971 -- finding the next split marker.
1973 case break (`elem` split_markers) xs of
1974 (p, _:ds) -> (p, ds)
1977 split_markers :: [Char]
1978 split_markers = [':', ';']
1980 dir_markers :: [Char]
1981 dir_markers = ['/', '\\']
1984 -- -----------------------------------------------------------------------------
1985 -- tmpDir, where we store temporary files.
1987 setTmpDir :: FilePath -> DynFlags -> DynFlags
1988 setTmpDir dir dflags = dflags{ tmpDir = normalise dir }
1989 -- we used to fix /cygdrive/c/.. on Windows, but this doesn't
1990 -- seem necessary now --SDM 7/2/2008
1992 -----------------------------------------------------------------------------
1995 setOptHpcDir :: String -> DynP ()
1996 setOptHpcDir arg = upd $ \ d -> d{hpcDir = arg}
1998 -----------------------------------------------------------------------------
1999 -- Via-C compilation stuff
2001 -- There are some options that we need to pass to gcc when compiling
2002 -- Haskell code via C, but are only supported by recent versions of
2003 -- gcc. The configure script decides which of these options we need,
2004 -- and puts them in the file "extra-gcc-opts" in $topdir, which is
2005 -- read before each via-C compilation. The advantage of having these
2006 -- in a separate file is that the file can be created at install-time
2007 -- depending on the available gcc version, and even re-generated later
2008 -- if gcc is upgraded.
2010 -- The options below are not dependent on the version of gcc, only the
2013 machdepCCOpts :: DynFlags -> ([String], -- flags for all C compilations
2014 [String]) -- for registerised HC compilations
2015 machdepCCOpts _dflags
2016 #if alpha_TARGET_ARCH
2018 #ifdef HAVE_THREADED_RTS_SUPPORT
2022 -- For now, to suppress the gcc warning "call-clobbered
2023 -- register used for global register variable", we simply
2024 -- disable all warnings altogether using the -w flag. Oh well.
2026 #elif hppa_TARGET_ARCH
2027 -- ___HPUX_SOURCE, not _HPUX_SOURCE, is #defined if -ansi!
2028 -- (very nice, but too bad the HP /usr/include files don't agree.)
2029 = ( ["-D_HPUX_SOURCE"], [] )
2031 #elif m68k_TARGET_ARCH
2032 -- -fno-defer-pop : for the .hc files, we want all the pushing/
2033 -- popping of args to routines to be explicit; if we let things
2034 -- be deferred 'til after an STGJUMP, imminent death is certain!
2036 -- -fomit-frame-pointer : *don't*
2037 -- It's better to have a6 completely tied up being a frame pointer
2038 -- rather than let GCC pick random things to do with it.
2039 -- (If we want to steal a6, then we would try to do things
2040 -- as on iX86, where we *do* steal the frame pointer [%ebp].)
2041 = ( [], ["-fno-defer-pop", "-fno-omit-frame-pointer"] )
2043 #elif i386_TARGET_ARCH
2044 -- -fno-defer-pop : basically the same game as for m68k
2046 -- -fomit-frame-pointer : *must* in .hc files; because we're stealing
2047 -- the fp (%ebp) for our register maps.
2048 = let n_regs = stolen_x86_regs _dflags
2051 ( [ if sta then "-DDONT_WANT_WIN32_DLL_SUPPORT" else ""
2054 "-fomit-frame-pointer",
2055 -- we want -fno-builtin, because when gcc inlines
2056 -- built-in functions like memcpy() it tends to
2057 -- run out of registers, requiring -monly-n-regs
2059 "-DSTOLEN_X86_REGS="++show n_regs ]
2062 #elif ia64_TARGET_ARCH
2063 = ( [], ["-fomit-frame-pointer", "-G0"] )
2065 #elif x86_64_TARGET_ARCH
2066 = ( [], ["-fomit-frame-pointer",
2067 "-fno-asynchronous-unwind-tables",
2068 -- the unwind tables are unnecessary for HC code,
2069 -- and get in the way of -split-objs. Another option
2070 -- would be to throw them away in the mangler, but this
2073 -- calling builtins like strlen() using the FFI can
2074 -- cause gcc to run out of regs, so use the external
2078 #elif sparc_TARGET_ARCH
2080 -- For now, to suppress the gcc warning "call-clobbered
2081 -- register used for global register variable", we simply
2082 -- disable all warnings altogether using the -w flag. Oh well.
2084 #elif powerpc_apple_darwin_TARGET
2086 -- Disable Apple's precompiling preprocessor. It's a great thing
2087 -- for "normal" programs, but it doesn't support register variable
2089 = ( [], ["-no-cpp-precomp"] )
2094 picCCOpts :: DynFlags -> [String]
2096 #if darwin_TARGET_OS
2097 -- Apple prefers to do things the other way round.
2098 -- PIC is on by default.
2099 -- -mdynamic-no-pic:
2100 -- Turn off PIC code generation.
2102 -- Don't generate "common" symbols - these are unwanted
2103 -- in dynamic libraries.
2106 = ["-fno-common", "-D__PIC__"]
2108 = ["-mdynamic-no-pic"]
2109 #elif mingw32_TARGET_OS
2110 -- no -fPIC for Windows
2117 = ["-fPIC", "-D__PIC__"]
2122 -- -----------------------------------------------------------------------------
2126 can_split = cSplitObjs == "YES"
2128 -- -----------------------------------------------------------------------------
2131 compilerInfo :: [(String, String)]
2132 compilerInfo = [("Project name", cProjectName),
2133 ("Project version", cProjectVersion),
2134 ("Booter version", cBooterVersion),
2136 ("Interface file version", cHscIfaceFileVersion),
2137 ("Have interpreter", cGhcWithInterpreter),
2138 ("Object splitting", cSplitObjs),
2139 ("Have native code generator", cGhcWithNativeCodeGen),
2140 ("Support SMP", cGhcWithSMP),
2141 ("Unregisterised", cGhcUnregisterised),
2142 ("Tables next to code", cGhcEnableTablesNextToCode),
2143 ("Win32 DLLs", cEnableWin32DLLs),
2144 ("RTS ways", cGhcRTSWays),
2145 ("Leading underscore", cLeadingUnderscore),
2146 ("Debug on", show debugIsOn)