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
41 parseDynamicNoPackageFlags,
44 supportedLanguages, languageOptions,
46 -- ** DynFlag C compiler options
47 machdepCCOpts, picCCOpts,
49 -- * Configuration of the core-to-core passes
56 -- * Configuration of the stg-to-stg passes
60 -- * Compiler configuration suitable for display to the user
64 #include "HsVersions.h"
68 import PrelNames ( mAIN, main_RDR_Unqual )
69 import RdrName ( RdrName, mkRdrUnqual )
70 import OccName ( mkVarOccFS )
71 #ifdef i386_TARGET_ARCH
72 import StaticFlags ( opt_Static )
74 import StaticFlags ( opt_PIC, WayName(..), v_Ways, v_Build_tag,
76 import {-# SOURCE #-} Packages (PackageState)
77 import DriverPhases ( Phase(..), phaseInputExt )
80 import Constants ( mAX_CONTEXT_REDUCTION_DEPTH )
82 import UniqFM ( UniqFM )
84 import Maybes ( orElse )
88 import {-# SOURCE #-} ErrUtils ( Severity(..), Message, mkLocMessage )
90 import Data.IORef ( readIORef )
91 import Control.Monad ( when )
94 import System.FilePath
95 import System.IO ( stderr, hPutChar )
97 -- -----------------------------------------------------------------------------
100 -- | Enumerates the simple on-or-off dynamic flags
106 | Opt_D_dump_cmmz_pretty
110 | Opt_D_dump_asm_native
111 | Opt_D_dump_asm_liveness
112 | Opt_D_dump_asm_coalesce
113 | Opt_D_dump_asm_regalloc
114 | Opt_D_dump_asm_regalloc_stages
115 | Opt_D_dump_asm_conflicts
116 | Opt_D_dump_asm_stats
122 | Opt_D_dump_inlinings
123 | Opt_D_dump_rule_firings
124 | Opt_D_dump_occur_anal
128 | Opt_D_dump_simpl_iterations
129 | Opt_D_dump_simpl_phases
138 | Opt_D_dump_worker_wrapper
139 | Opt_D_dump_rn_trace
140 | Opt_D_dump_rn_stats
142 | Opt_D_dump_simpl_stats
143 | Opt_D_dump_tc_trace
144 | Opt_D_dump_if_trace
151 | Opt_D_verbose_core2core
152 | Opt_D_verbose_stg2stg
154 | Opt_D_dump_hi_diffs
155 | Opt_D_dump_minimal_imports
156 | Opt_D_dump_mod_cycles
157 | Opt_D_dump_view_pattern_commoning
158 | Opt_D_faststring_stats
159 | Opt_DumpToFile -- ^ Append dump output to files instead of stdout.
160 | Opt_D_no_debug_output
166 | Opt_WarnIsError -- -Werror; makes warnings fatal
167 | Opt_WarnDuplicateExports
169 | Opt_WarnImplicitPrelude
170 | Opt_WarnIncompletePatterns
171 | Opt_WarnIncompletePatternsRecUpd
172 | Opt_WarnMissingFields
173 | Opt_WarnMissingMethods
174 | Opt_WarnMissingSigs
175 | Opt_WarnNameShadowing
176 | Opt_WarnOverlappingPatterns
177 | Opt_WarnSimplePatterns
178 | Opt_WarnTypeDefaults
179 | Opt_WarnMonomorphism
180 | Opt_WarnUnusedBinds
181 | Opt_WarnUnusedImports
182 | Opt_WarnUnusedMatches
183 | Opt_WarnWarningsDeprecations
184 | Opt_WarnDeprecatedFlags
185 | Opt_WarnDodgyImports
188 | Opt_WarnUnrecognisedPragmas
189 | Opt_WarnDodgyForeignImports
192 | Opt_OverlappingInstances
193 | Opt_UndecidableInstances
194 | Opt_IncoherentInstances
195 | Opt_MonomorphismRestriction
197 | Opt_ExtendedDefaultRules -- Use GHC's extended rules for defaulting
198 | Opt_ForeignFunctionInterface
199 | Opt_UnliftedFFITypes
200 | Opt_PArr -- Syntactic support for parallel arrays
201 | Opt_Arrows -- Arrow-notation syntax
202 | Opt_TemplateHaskell
205 | Opt_Generics -- "Derivable type classes"
206 | Opt_ImplicitPrelude
207 | Opt_ScopedTypeVariables
211 | Opt_OverloadedStrings
212 | Opt_DisambiguateRecordFields
213 | Opt_RecordWildCards
218 | Opt_StandaloneDeriving
219 | Opt_DeriveDataTypeable
220 | Opt_TypeSynonymInstances
221 | Opt_FlexibleContexts
222 | Opt_FlexibleInstances
223 | Opt_ConstrainedClassMethods
224 | Opt_MultiParamTypeClasses
225 | Opt_FunctionalDependencies
227 | Opt_PolymorphicComponents
228 | Opt_ExistentialQuantification
232 | Opt_ParallelListComp
233 | Opt_TransformListComp
234 | Opt_GeneralizedNewtypeDeriving
236 | Opt_PostfixOperators
238 | Opt_LiberalTypeSynonyms
241 | Opt_ImpredicativeTypes
244 | Opt_NewQualifiedOperators
246 | Opt_PrintExplicitForalls
251 | Opt_StaticArgumentTransformation
255 | Opt_IgnoreInterfacePragmas
256 | Opt_OmitInterfacePragmas
257 | Opt_DoLambdaEtaExpansion
261 | Opt_UnboxStrictFields
264 | Opt_EnableRewriteRules -- Apply rewrite rules during simplification
266 | Opt_RegsGraph -- do graph coloring register allocation
267 | Opt_RegsIterative -- do iterative coalescing graph coloring register allocation
275 | Opt_ExcessPrecision
276 | Opt_ReadUserPackageConf
280 | Opt_HideAllPackages
281 | Opt_PrintBindResult
285 | Opt_BreakOnException
287 | Opt_PrintEvldWithShow
288 | Opt_PrintBindContents
292 | Opt_ConvertToZipCfgAndBack
293 | Opt_AutoLinkPackages
294 | Opt_ImplicitImportQualified
302 | Opt_KeepRawTokenStream
306 -- | Contains not only a collection of 'DynFlag's but also a plethora of
307 -- information relating to the compilation of a single file or GHC session
308 data DynFlags = DynFlags {
311 coreToDo :: Maybe [CoreToDo], -- reserved for -Ofile
312 stgToDo :: Maybe [StgToDo], -- similarly
313 hscTarget :: HscTarget,
314 hscOutName :: String, -- ^ Name of the output file
315 extCoreName :: String, -- ^ Name of the .hcr output file
316 verbosity :: Int, -- ^ Verbosity level: see "DynFlags#verbosity_levels"
317 optLevel :: Int, -- ^ Optimisation level
318 simplPhases :: Int, -- ^ Number of simplifier phases
319 maxSimplIterations :: Int, -- ^ Max simplifier iterations
320 shouldDumpSimplPhase :: SimplifierMode -> Bool,
321 ruleCheck :: Maybe String,
323 specConstrThreshold :: Maybe Int, -- ^ Threshold for SpecConstr
324 specConstrCount :: Maybe Int, -- ^ Max number of specialisations for any one function
325 liberateCaseThreshold :: Maybe Int, -- ^ Threshold for LiberateCase
327 stolen_x86_regs :: Int,
328 cmdlineHcIncludes :: [String], -- ^ @\-\#includes@
329 importPaths :: [FilePath],
331 mainFunIs :: Maybe String,
332 ctxtStkDepth :: Int, -- ^ Typechecker context stack depth
334 dphBackend :: DPHBackend,
336 thisPackage :: PackageId, -- ^ name of package currently being compiled
339 wayNames :: [WayName], -- ^ Way flags from the command line
340 buildTag :: String, -- ^ The global \"way\" (e.g. \"p\" for prof)
341 rtsBuildTag :: String, -- ^ The RTS \"way\"
344 objectDir :: Maybe String,
345 hiDir :: Maybe String,
346 stubDir :: Maybe String,
352 outputFile :: Maybe String,
353 outputHi :: Maybe String,
354 dynLibLoader :: DynLibLoader,
356 -- | This is set by 'DriverPipeline.runPipeline' based on where
357 -- its output is going.
358 dumpPrefix :: Maybe FilePath,
360 -- | Override the 'dumpPrefix' set by 'DriverPipeline.runPipeline'.
361 -- Set by @-ddump-file-prefix@
362 dumpPrefixForce :: Maybe FilePath,
364 includePaths :: [String],
365 libraryPaths :: [String],
366 frameworkPaths :: [String], -- used on darwin only
367 cmdlineFrameworks :: [String], -- ditto
368 tmpDir :: String, -- no trailing '/'
370 ghcUsagePath :: FilePath, -- Filled in by SysTools
371 ghciUsagePath :: FilePath, -- ditto
373 hpcDir :: String, -- ^ Path to store the .mix files
375 -- options for particular phases
383 opt_windres :: [String],
385 -- commands for particular phases
387 pgm_P :: (String,[Option]),
389 pgm_c :: (String,[Option]),
390 pgm_m :: (String,[Option]),
391 pgm_s :: (String,[Option]),
392 pgm_a :: (String,[Option]),
393 pgm_l :: (String,[Option]),
394 pgm_dll :: (String,[Option]),
396 pgm_sysman :: String,
397 pgm_windres :: String,
400 depMakefile :: FilePath,
401 depIncludePkgDeps :: Bool,
402 depExcludeMods :: [ModuleName],
403 depSuffixes :: [String],
407 extraPkgConfs :: [FilePath],
408 topDir :: FilePath, -- filled in by SysTools
409 systemPackageConfig :: FilePath, -- ditto
410 -- ^ The @-package-conf@ flags given on the command line, in the order
413 packageFlags :: [PackageFlag],
414 -- ^ The @-package@ and @-hide-package@ flags from the command-line
417 -- NB. do not modify this field, it is calculated by
418 -- Packages.initPackages and Packages.updatePackages.
419 pkgDatabase :: Maybe (UniqFM PackageConfig),
420 pkgState :: PackageState,
425 -- | Message output action: use "ErrUtils" instead of this if you can
426 log_action :: Severity -> SrcSpan -> PprStyle -> Message -> IO (),
428 haddockOptions :: Maybe String
439 -- | Will this target result in an object file on the disk?
440 isObjectTarget :: HscTarget -> Bool
441 isObjectTarget HscC = True
442 isObjectTarget HscAsm = True
443 isObjectTarget _ = False
445 -- | The 'GhcMode' tells us whether we're doing multi-module
446 -- compilation (controlled via the "GHC" API) or one-shot
447 -- (single-module) compilation. This makes a difference primarily to
448 -- the "Finder": in one-shot mode we look for interface files for
449 -- imported modules, but in multi-module mode we look for source files
450 -- in order to check whether they need to be recompiled.
452 = CompManager -- ^ @\-\-make@, GHCi, etc.
453 | OneShot -- ^ @ghc -c Foo.hs@
454 | MkDepend -- ^ @ghc -M@, see "Finder" for why we need this
457 instance Outputable GhcMode where
458 ppr CompManager = ptext (sLit "CompManager")
459 ppr OneShot = ptext (sLit "OneShot")
460 ppr MkDepend = ptext (sLit "MkDepend")
462 isOneShot :: GhcMode -> Bool
463 isOneShot OneShot = True
464 isOneShot _other = False
466 -- | What to do in the link step, if there is one.
468 = NoLink -- ^ Don't link at all
469 | LinkBinary -- ^ Link object code into a binary
470 | LinkInMemory -- ^ Use the in-memory dynamic linker
471 | LinkDynLib -- ^ Link objects into a dynamic lib (DLL on Windows, DSO on ELF platforms)
474 isNoLink :: GhcLink -> Bool
475 isNoLink NoLink = True
479 = ExposePackage String
481 | IgnorePackage String
484 defaultHscTarget :: HscTarget
485 defaultHscTarget = defaultObjectTarget
487 -- | The 'HscTarget' value corresponding to the default way to create
488 -- object files on the current platform.
489 defaultObjectTarget :: HscTarget
491 | cGhcWithNativeCodeGen == "YES" = HscAsm
496 | Wrapped (Maybe String)
500 -- | Used by 'GHC.newSession' to partially initialize a new 'DynFlags' value
501 initDynFlags :: DynFlags -> IO DynFlags
502 initDynFlags dflags = do
503 -- someday these will be dynamic flags
504 ways <- readIORef v_Ways
505 build_tag <- readIORef v_Build_tag
506 rts_build_tag <- readIORef v_RTS_Build_tag
509 buildTag = build_tag,
510 rtsBuildTag = rts_build_tag
513 -- | The normal 'DynFlags'. Note that they is not suitable for use in this form
514 -- and must be fully initialized by 'GHC.newSession' first.
515 defaultDynFlags :: DynFlags
518 ghcMode = CompManager,
519 ghcLink = LinkBinary,
522 hscTarget = defaultHscTarget,
528 maxSimplIterations = 4,
529 shouldDumpSimplPhase = const False,
531 specConstrThreshold = Just 200,
532 specConstrCount = Just 3,
533 liberateCaseThreshold = Just 200,
535 cmdlineHcIncludes = [],
539 ctxtStkDepth = mAX_CONTEXT_REDUCTION_DEPTH,
543 thisPackage = mainPackageId,
549 objectSuf = phaseInputExt StopLn,
550 hcSuf = phaseInputExt HCc,
553 outputFile = Nothing,
555 dynLibLoader = Deployable,
556 dumpPrefix = Nothing,
557 dumpPrefixForce = Nothing,
561 cmdlineFrameworks = [],
562 tmpDir = cDEFAULT_TMPDIR,
579 pkgDatabase = Nothing,
580 pkgState = panic "no package state yet: call GHC.setSessionDynFlags",
581 wayNames = panic "defaultDynFlags: No wayNames",
582 buildTag = panic "defaultDynFlags: No buildTag",
583 rtsBuildTag = panic "defaultDynFlags: No rtsBuildTag",
584 -- initSysTools fills all these in
585 ghcUsagePath = panic "defaultDynFlags: No ghciUsagePath",
586 ghciUsagePath = panic "defaultDynFlags: No ghciUsagePath",
587 topDir = panic "defaultDynFlags: No topDir",
588 systemPackageConfig = panic "no systemPackageConfig: call GHC.setSessionDynFlags",
589 pgm_L = panic "defaultDynFlags: No pgm_L",
590 pgm_P = panic "defaultDynFlags: No pgm_P",
591 pgm_F = panic "defaultDynFlags: No pgm_F",
592 pgm_c = panic "defaultDynFlags: No pgm_c",
593 pgm_m = panic "defaultDynFlags: No pgm_m",
594 pgm_s = panic "defaultDynFlags: No pgm_s",
595 pgm_a = panic "defaultDynFlags: No pgm_a",
596 pgm_l = panic "defaultDynFlags: No pgm_l",
597 pgm_dll = panic "defaultDynFlags: No pgm_dll",
598 pgm_T = panic "defaultDynFlags: No pgm_T",
599 pgm_sysman = panic "defaultDynFlags: No pgm_sysman",
600 pgm_windres = panic "defaultDynFlags: No pgm_windres",
601 -- end of initSysTools values
603 depMakefile = "Makefile",
604 depIncludePkgDeps = False,
608 -- end of ghc -M values
609 haddockOptions = Nothing,
611 Opt_AutoLinkPackages,
612 Opt_ReadUserPackageConf,
614 Opt_MonoPatBinds, -- Experimentally, I'm making this non-standard
615 -- behaviour the default, to see if anyone notices
619 Opt_MonomorphismRestriction,
627 Opt_PrintBindContents
629 ++ [f | (ns,f) <- optLevelFlags, 0 `elem` ns]
630 -- The default -O0 options
633 log_action = \severity srcSpan style msg ->
635 SevInfo -> printErrs (msg style)
636 SevFatal -> printErrs (msg style)
639 printErrs ((mkLocMessage srcSpan msg) style)
640 -- careful (#2302): printErrs prints in UTF-8, whereas
641 -- converting to string first and using hPutStr would
642 -- just emit the low 8 bits of each unicode char.
649 0 | print errors & warnings only
650 1 | minimal verbosity: print "compiling M ... done." for each module.
651 2 | equivalent to -dshow-passes
652 3 | equivalent to existing "ghc -v"
653 4 | "ghc -v -ddump-most"
654 5 | "ghc -v -ddump-all"
657 -- | Test whether a 'DynFlag' is set
658 dopt :: DynFlag -> DynFlags -> Bool
659 dopt f dflags = f `elem` (flags dflags)
662 dopt_set :: DynFlags -> DynFlag -> DynFlags
663 dopt_set dfs f = dfs{ flags = f : flags dfs }
665 -- | Unset a 'DynFlag'
666 dopt_unset :: DynFlags -> DynFlag -> DynFlags
667 dopt_unset dfs f = dfs{ flags = filter (/= f) (flags dfs) }
669 -- | Retrieve the options corresponding to a particular @opt_*@ field in the correct order
670 getOpts :: DynFlags -- ^ 'DynFlags' to retrieve the options from
671 -> (DynFlags -> [a]) -- ^ Relevant record accessor: one of the @opt_*@ accessors
672 -> [a] -- ^ Correctly ordered extracted options
673 getOpts dflags opts = reverse (opts dflags)
674 -- We add to the options from the front, so we need to reverse the list
676 -- | Gets the verbosity flag for the current verbosity level. This is fed to
677 -- other tools, so GHC-specific verbosity flags like @-ddump-most@ are not included
678 getVerbFlag :: DynFlags -> String
680 | verbosity dflags >= 3 = "-v"
683 setObjectDir, setHiDir, setStubDir, setObjectSuf, setHiSuf, setHcSuf, parseDynLibLoaderMode,
684 setPgmP, setPgmL, setPgmF, setPgmc, setPgmm, setPgms, setPgma, setPgml, setPgmdll, setPgmwindres,
685 addOptL, addOptP, addOptF, addOptc, addOptm, addOpta, addOptl, addOptwindres,
686 addCmdlineFramework, addHaddockOpts
687 :: String -> DynFlags -> DynFlags
688 setOutputFile, setOutputHi, setDumpPrefixForce
689 :: Maybe String -> DynFlags -> DynFlags
691 setObjectDir f d = d{ objectDir = Just f}
692 setHiDir f d = d{ hiDir = Just f}
693 setStubDir f d = d{ stubDir = Just f, includePaths = f : includePaths d }
694 -- -stubdir D adds an implicit -I D, so that gcc can find the _stub.h file
695 -- \#included from the .hc file when compiling with -fvia-C.
697 setObjectSuf f d = d{ objectSuf = f}
698 setHiSuf f d = d{ hiSuf = f}
699 setHcSuf f d = d{ hcSuf = f}
701 setOutputFile f d = d{ outputFile = f}
702 setOutputHi f d = d{ outputHi = f}
704 parseDynLibLoaderMode f d =
706 ("deploy", "") -> d{ dynLibLoader = Deployable }
707 ("sysdep", "") -> d{ dynLibLoader = SystemDependent }
708 ("wrapped", "") -> d{ dynLibLoader = Wrapped Nothing }
709 ("wrapped:", "hard") -> d{ dynLibLoader = Wrapped Nothing }
710 ("wrapped:", flex) -> d{ dynLibLoader = Wrapped (Just flex) }
711 (_,_) -> error "Unknown dynlib loader"
713 setDumpPrefixForce f d = d { dumpPrefixForce = f}
715 -- XXX HACK: Prelude> words "'does not' work" ===> ["'does","not'","work"]
716 -- Config.hs should really use Option.
717 setPgmP f d = let (pgm:args) = words f in d{ pgm_P = (pgm, map Option args)}
719 setPgmL f d = d{ pgm_L = f}
720 setPgmF f d = d{ pgm_F = f}
721 setPgmc f d = d{ pgm_c = (f,[])}
722 setPgmm f d = d{ pgm_m = (f,[])}
723 setPgms f d = d{ pgm_s = (f,[])}
724 setPgma f d = d{ pgm_a = (f,[])}
725 setPgml f d = d{ pgm_l = (f,[])}
726 setPgmdll f d = d{ pgm_dll = (f,[])}
727 setPgmwindres f d = d{ pgm_windres = f}
729 addOptL f d = d{ opt_L = f : opt_L d}
730 addOptP f d = d{ opt_P = f : opt_P d}
731 addOptF f d = d{ opt_F = f : opt_F d}
732 addOptc f d = d{ opt_c = f : opt_c d}
733 addOptm f d = d{ opt_m = f : opt_m d}
734 addOpta f d = d{ opt_a = f : opt_a d}
735 addOptl f d = d{ opt_l = f : opt_l d}
736 addOptwindres f d = d{ opt_windres = f : opt_windres d}
738 setDepMakefile :: FilePath -> DynFlags -> DynFlags
739 setDepMakefile f d = d { depMakefile = deOptDep f }
741 setDepIncludePkgDeps :: Bool -> DynFlags -> DynFlags
742 setDepIncludePkgDeps b d = d { depIncludePkgDeps = b }
744 addDepExcludeMod :: String -> DynFlags -> DynFlags
746 = d { depExcludeMods = mkModuleName (deOptDep m) : depExcludeMods d }
748 addDepSuffix :: FilePath -> DynFlags -> DynFlags
749 addDepSuffix s d = d { depSuffixes = deOptDep s : depSuffixes d }
751 setDepWarnings :: Bool -> DynFlags -> DynFlags
752 setDepWarnings b d = d { depWarnings = b }
755 -- We used to use "-optdep-flag -optdeparg", so for legacy applications
756 -- we need to strip the "-optdep" off of the arg
757 deOptDep :: String -> String
758 deOptDep x = case maybePrefixMatch "-optdep" x of
762 addCmdlineFramework f d = d{ cmdlineFrameworks = f : cmdlineFrameworks d}
764 addHaddockOpts f d = d{ haddockOptions = Just f}
766 -- -----------------------------------------------------------------------------
767 -- Command-line options
769 -- | When invoking external tools as part of the compilation pipeline, we
770 -- pass these a sequence of options on the command-line. Rather than
771 -- just using a list of Strings, we use a type that allows us to distinguish
772 -- between filepaths and 'other stuff'. The reason for this is that
773 -- this type gives us a handle on transforming filenames, and filenames only,
774 -- to whatever format they're expected to be on a particular platform.
776 = FileOption -- an entry that _contains_ filename(s) / filepaths.
777 String -- a non-filepath prefix that shouldn't be
778 -- transformed (e.g., "/out=")
779 String -- the filepath/filename portion
782 -----------------------------------------------------------------------------
783 -- Setting the optimisation level
785 updOptLevel :: Int -> DynFlags -> DynFlags
786 -- ^ Sets the 'DynFlags' to be appropriate to the optimisation level
788 = dfs2{ optLevel = final_n }
790 final_n = max 0 (min 2 n) -- Clamp to 0 <= n <= 2
791 dfs1 = foldr (flip dopt_unset) dfs remove_dopts
792 dfs2 = foldr (flip dopt_set) dfs1 extra_dopts
794 extra_dopts = [ f | (ns,f) <- optLevelFlags, final_n `elem` ns ]
795 remove_dopts = [ f | (ns,f) <- optLevelFlags, final_n `notElem` ns ]
797 optLevelFlags :: [([Int], DynFlag)]
799 = [ ([0], Opt_IgnoreInterfacePragmas)
800 , ([0], Opt_OmitInterfacePragmas)
802 , ([1,2], Opt_IgnoreAsserts)
803 , ([1,2], Opt_EnableRewriteRules) -- Off for -O0; see Note [Scoping for Builtin rules]
805 , ([1,2], Opt_DoEtaReduction)
806 , ([1,2], Opt_CaseMerge)
807 , ([1,2], Opt_Strictness)
809 , ([1,2], Opt_FullLaziness)
811 , ([2], Opt_LiberateCase)
812 , ([2], Opt_SpecConstr)
814 -- , ([2], Opt_StaticArgumentTransformation)
815 -- Max writes: I think it's probably best not to enable SAT with -O2 for the
816 -- 6.10 release. The version of SAT in HEAD at the moment doesn't incorporate
817 -- several improvements to the heuristics, and I'm concerned that without
818 -- those changes SAT will interfere with some attempts to write "high
819 -- performance Haskell", as we saw in some posts on Haskell-Cafe earlier
820 -- this year. In particular, the version in HEAD lacks the tail call
821 -- criterion, so many things that look like reasonable loops will be
822 -- turned into functions with extra (unneccesary) thunk creation.
824 , ([0,1,2], Opt_DoLambdaEtaExpansion)
825 -- This one is important for a tiresome reason:
826 -- we want to make sure that the bindings for data
827 -- constructors are eta-expanded. This is probably
828 -- a good thing anyway, but it seems fragile.
831 -- -----------------------------------------------------------------------------
832 -- Standard sets of warning options
834 standardWarnings :: [DynFlag]
836 = [ Opt_WarnWarningsDeprecations,
837 Opt_WarnDeprecatedFlags,
838 Opt_WarnUnrecognisedPragmas,
839 Opt_WarnOverlappingPatterns,
840 Opt_WarnMissingFields,
841 Opt_WarnMissingMethods,
842 Opt_WarnDuplicateExports,
843 Opt_WarnDodgyForeignImports
846 minusWOpts :: [DynFlag]
848 = standardWarnings ++
849 [ Opt_WarnUnusedBinds,
850 Opt_WarnUnusedMatches,
851 Opt_WarnUnusedImports,
852 Opt_WarnIncompletePatterns,
856 minusWallOpts :: [DynFlag]
859 [ Opt_WarnTypeDefaults,
860 Opt_WarnNameShadowing,
866 -- minuswRemovesOpts should be every warning option
867 minuswRemovesOpts :: [DynFlag]
870 [Opt_WarnImplicitPrelude,
871 Opt_WarnIncompletePatternsRecUpd,
872 Opt_WarnSimplePatterns,
873 Opt_WarnMonomorphism,
874 Opt_WarnUnrecognisedPragmas,
878 -- -----------------------------------------------------------------------------
879 -- CoreToDo: abstraction of core-to-core passes to run.
881 data CoreToDo -- These are diff core-to-core passes,
882 -- which may be invoked in any order,
883 -- as many times as you like.
885 = CoreDoSimplify -- The core-to-core simplifier.
888 -- Each run of the simplifier can take a different
889 -- set of simplifier-specific flags.
891 | CoreDoFloatOutwards FloatOutSwitches
896 | CoreDoWorkerWrapper
899 | CoreDoOldStrictness
902 | CoreDoRuleCheck Int{-CompilerPhase-} String -- Check for non-application of rules
903 -- matching this string
904 | CoreDoVectorisation PackageId
905 | CoreDoNothing -- Useful when building up
906 | CoreDoPasses [CoreToDo] -- lists of these things
908 data SimplifierMode -- See comments in SimplMonad
910 | SimplPhase Int [String]
912 data SimplifierSwitch
913 = MaxSimplifierIterations Int
916 data FloatOutSwitches
917 = FloatOutSw Bool -- True <=> float lambdas to top level
918 Bool -- True <=> float constants to top level,
919 -- even if they do not escape a lambda
922 -- The core-to-core pass ordering is derived from the DynFlags:
923 runWhen :: Bool -> CoreToDo -> CoreToDo
924 runWhen True do_this = do_this
925 runWhen False _ = CoreDoNothing
927 runMaybe :: Maybe a -> (a -> CoreToDo) -> CoreToDo
928 runMaybe (Just x) f = f x
929 runMaybe Nothing _ = CoreDoNothing
931 getCoreToDo :: DynFlags -> [CoreToDo]
933 | Just todo <- coreToDo dflags = todo -- set explicitly by user
934 | otherwise = core_todo
936 opt_level = optLevel dflags
937 phases = simplPhases dflags
938 max_iter = maxSimplIterations dflags
939 strictness = dopt Opt_Strictness dflags
940 full_laziness = dopt Opt_FullLaziness dflags
941 cse = dopt Opt_CSE dflags
942 spec_constr = dopt Opt_SpecConstr dflags
943 liberate_case = dopt Opt_LiberateCase dflags
944 rule_check = ruleCheck dflags
945 static_args = dopt Opt_StaticArgumentTransformation dflags
947 maybe_rule_check phase = runMaybe rule_check (CoreDoRuleCheck phase)
949 simpl_phase phase names iter
951 [ CoreDoSimplify (SimplPhase phase names) [
952 MaxSimplifierIterations iter
954 maybe_rule_check phase
958 = runWhen (dopt Opt_Vectorise dflags)
959 $ CoreDoPasses [ simpl_gently, CoreDoVectorisation (dphPackage dflags) ]
962 -- By default, we have 2 phases before phase 0.
964 -- Want to run with inline phase 2 after the specialiser to give
965 -- maximum chance for fusion to work before we inline build/augment
966 -- in phase 1. This made a difference in 'ansi' where an
967 -- overloaded function wasn't inlined till too late.
969 -- Need phase 1 so that build/augment get
970 -- inlined. I found that spectral/hartel/genfft lost some useful
971 -- strictness in the function sumcode' if augment is not inlined
972 -- before strictness analysis runs
973 simpl_phases = CoreDoPasses [ simpl_phase phase ["main"] max_iter
974 | phase <- [phases, phases-1 .. 1] ]
977 -- initial simplify: mk specialiser happy: minimum effort please
978 simpl_gently = CoreDoSimplify SimplGently [
980 -- Don't inline anything till full laziness has bitten
981 -- In particular, inlining wrappers inhibits floating
982 -- e.g. ...(case f x of ...)...
983 -- ==> ...(case (case x of I# x# -> fw x#) of ...)...
984 -- ==> ...(case x of I# x# -> case fw x# of ...)...
985 -- and now the redex (f x) isn't floatable any more
986 -- Similarly, don't apply any rules until after full
987 -- laziness. Notably, list fusion can prevent floating.
989 NoCaseOfCase, -- Don't do case-of-case transformations.
990 -- This makes full laziness work better
991 MaxSimplifierIterations max_iter
995 if opt_level == 0 then
997 simpl_phase 0 ["final"] max_iter]
998 else {- opt_level >= 1 -} [
1000 -- We want to do the static argument transform before full laziness as it
1001 -- may expose extra opportunities to float things outwards. However, to fix
1002 -- up the output of the transformation we need at do at least one simplify
1003 -- after this before anything else
1004 runWhen static_args (CoreDoPasses [ simpl_gently, CoreDoStaticArgs ]),
1006 -- We run vectorisation here for now, but we might also try to run
1010 -- initial simplify: mk specialiser happy: minimum effort please
1013 -- Specialisation is best done before full laziness
1014 -- so that overloaded functions have all their dictionary lambdas manifest
1017 runWhen full_laziness (CoreDoFloatOutwards (FloatOutSw False False)),
1023 -- Phase 0: allow all Ids to be inlined now
1024 -- This gets foldr inlined before strictness analysis
1026 -- At least 3 iterations because otherwise we land up with
1027 -- huge dead expressions because of an infelicity in the
1029 -- let k = BIG in foldr k z xs
1030 -- ==> let k = BIG in letrec go = \xs -> ...(k x).... in go xs
1031 -- ==> let k = BIG in letrec go = \xs -> ...(BIG x).... in go xs
1033 simpl_phase 0 ["main"] (max max_iter 3),
1036 #ifdef OLD_STRICTNESS
1037 CoreDoOldStrictness,
1039 runWhen strictness (CoreDoPasses [
1041 CoreDoWorkerWrapper,
1043 simpl_phase 0 ["post-worker-wrapper"] max_iter
1046 runWhen full_laziness
1047 (CoreDoFloatOutwards (FloatOutSw False -- Not lambdas
1048 True)), -- Float constants
1049 -- nofib/spectral/hartel/wang doubles in speed if you
1050 -- do full laziness late in the day. It only happens
1051 -- after fusion and other stuff, so the early pass doesn't
1052 -- catch it. For the record, the redex is
1053 -- f_el22 (f_el21 r_midblock)
1056 runWhen cse CoreCSE,
1057 -- We want CSE to follow the final full-laziness pass, because it may
1058 -- succeed in commoning up things floated out by full laziness.
1059 -- CSE used to rely on the no-shadowing invariant, but it doesn't any more
1065 -- Case-liberation for -O2. This should be after
1066 -- strictness analysis and the simplification which follows it.
1067 runWhen liberate_case (CoreDoPasses [
1069 simpl_phase 0 ["post-liberate-case"] max_iter
1070 ]), -- Run the simplifier after LiberateCase to vastly
1071 -- reduce the possiblility of shadowing
1072 -- Reason: see Note [Shadowing] in SpecConstr.lhs
1074 runWhen spec_constr CoreDoSpecConstr,
1078 -- Final clean-up simplification:
1079 simpl_phase 0 ["final"] max_iter
1082 -- -----------------------------------------------------------------------------
1083 -- StgToDo: abstraction of stg-to-stg passes to run.
1086 = StgDoMassageForProfiling -- should be (next to) last
1087 -- There's also setStgVarInfo, but its absolute "lastness"
1088 -- is so critical that it is hardwired in (no flag).
1091 getStgToDo :: DynFlags -> [StgToDo]
1093 | Just todo <- stgToDo dflags = todo -- set explicitly by user
1096 stg_stats = dopt Opt_StgStats dflags
1098 todo1 = if stg_stats then [D_stg_stats] else []
1100 todo2 | WayProf `elem` wayNames dflags
1101 = StgDoMassageForProfiling : todo1
1105 -- -----------------------------------------------------------------------------
1108 allFlags :: [String]
1109 allFlags = map ('-':) $
1110 [ flagName flag | flag <- dynamic_flags, ok (flagOptKind flag) ] ++
1111 map ("fno-"++) flags ++
1112 map ("f"++) flags ++
1113 map ("X"++) supportedLanguages ++
1114 map ("XNo"++) supportedLanguages
1115 where ok (PrefixPred _ _) = False
1117 flags = [ name | (name, _, _) <- fFlags ]
1119 dynamic_flags :: [Flag DynP]
1121 Flag "n" (NoArg (setDynFlag Opt_DryRun)) Supported
1122 , Flag "cpp" (NoArg (setDynFlag Opt_Cpp)) Supported
1123 , Flag "F" (NoArg (setDynFlag Opt_Pp)) Supported
1124 , Flag "#include" (HasArg (addCmdlineHCInclude)) Supported
1125 , Flag "v" (OptIntSuffix setVerbosity) Supported
1127 ------- Specific phases --------------------------------------------
1128 , Flag "pgmL" (HasArg (upd . setPgmL)) Supported
1129 , Flag "pgmP" (HasArg (upd . setPgmP)) Supported
1130 , Flag "pgmF" (HasArg (upd . setPgmF)) Supported
1131 , Flag "pgmc" (HasArg (upd . setPgmc)) Supported
1132 , Flag "pgmm" (HasArg (upd . setPgmm)) Supported
1133 , Flag "pgms" (HasArg (upd . setPgms)) Supported
1134 , Flag "pgma" (HasArg (upd . setPgma)) Supported
1135 , Flag "pgml" (HasArg (upd . setPgml)) Supported
1136 , Flag "pgmdll" (HasArg (upd . setPgmdll)) Supported
1137 , Flag "pgmwindres" (HasArg (upd . setPgmwindres)) Supported
1139 , Flag "optL" (HasArg (upd . addOptL)) Supported
1140 , Flag "optP" (HasArg (upd . addOptP)) Supported
1141 , Flag "optF" (HasArg (upd . addOptF)) Supported
1142 , Flag "optc" (HasArg (upd . addOptc)) Supported
1143 , Flag "optm" (HasArg (upd . addOptm)) Supported
1144 , Flag "opta" (HasArg (upd . addOpta)) Supported
1145 , Flag "optl" (HasArg (upd . addOptl)) Supported
1146 , Flag "optwindres" (HasArg (upd . addOptwindres)) Supported
1149 (NoArg (if can_split then setDynFlag Opt_SplitObjs else return ()))
1152 -------- ghc -M -----------------------------------------------------
1153 , Flag "dep-suffix" (HasArg (upd . addDepSuffix)) Supported
1154 , Flag "optdep-s" (HasArg (upd . addDepSuffix))
1155 (Deprecated "Use -dep-suffix instead")
1156 , Flag "dep-makefile" (HasArg (upd . setDepMakefile)) Supported
1157 , Flag "optdep-f" (HasArg (upd . setDepMakefile))
1158 (Deprecated "Use -dep-makefile instead")
1159 , Flag "optdep-w" (NoArg (upd (setDepWarnings False)))
1160 (Deprecated "-optdep-w doesn't do anything")
1161 , Flag "include-pkg-deps" (NoArg (upd (setDepIncludePkgDeps True))) Supported
1162 , Flag "optdep--include-prelude" (NoArg (upd (setDepIncludePkgDeps True)))
1163 (Deprecated "Use -include-pkg-deps instead")
1164 , Flag "optdep--include-pkg-deps" (NoArg (upd (setDepIncludePkgDeps True)))
1165 (Deprecated "Use -include-pkg-deps instead")
1166 , Flag "exclude-module" (HasArg (upd . addDepExcludeMod)) Supported
1167 , Flag "optdep--exclude-module" (HasArg (upd . addDepExcludeMod))
1168 (Deprecated "Use -exclude-module instead")
1169 , Flag "optdep-x" (HasArg (upd . addDepExcludeMod))
1170 (Deprecated "Use -exclude-module instead")
1172 -------- Linking ----------------------------------------------------
1173 , Flag "c" (NoArg (upd $ \d -> d{ ghcLink=NoLink } ))
1175 , Flag "no-link" (NoArg (upd $ \d -> d{ ghcLink=NoLink } ))
1176 (Deprecated "Use -c instead")
1177 , Flag "shared" (NoArg (upd $ \d -> d{ ghcLink=LinkDynLib } ))
1179 , Flag "dynload" (HasArg (upd . parseDynLibLoaderMode))
1182 ------- Libraries ---------------------------------------------------
1183 , Flag "L" (Prefix addLibraryPath ) Supported
1184 , Flag "l" (AnySuffix (\s -> do upd (addOptl s))) Supported
1186 ------- Frameworks --------------------------------------------------
1187 -- -framework-path should really be -F ...
1188 , Flag "framework-path" (HasArg addFrameworkPath ) Supported
1189 , Flag "framework" (HasArg (upd . addCmdlineFramework)) Supported
1191 ------- Output Redirection ------------------------------------------
1192 , Flag "odir" (HasArg (upd . setObjectDir)) Supported
1193 , Flag "o" (SepArg (upd . setOutputFile . Just)) Supported
1194 , Flag "ohi" (HasArg (upd . setOutputHi . Just )) Supported
1195 , Flag "osuf" (HasArg (upd . setObjectSuf)) Supported
1196 , Flag "hcsuf" (HasArg (upd . setHcSuf)) Supported
1197 , Flag "hisuf" (HasArg (upd . setHiSuf)) Supported
1198 , Flag "hidir" (HasArg (upd . setHiDir)) Supported
1199 , Flag "tmpdir" (HasArg (upd . setTmpDir)) Supported
1200 , Flag "stubdir" (HasArg (upd . setStubDir)) Supported
1201 , Flag "ddump-file-prefix" (HasArg (upd . setDumpPrefixForce . Just))
1204 ------- Keeping temporary files -------------------------------------
1205 -- These can be singular (think ghc -c) or plural (think ghc --make)
1206 , Flag "keep-hc-file" (NoArg (setDynFlag Opt_KeepHcFiles)) Supported
1207 , Flag "keep-hc-files" (NoArg (setDynFlag Opt_KeepHcFiles)) Supported
1208 , Flag "keep-s-file" (NoArg (setDynFlag Opt_KeepSFiles)) Supported
1209 , Flag "keep-s-files" (NoArg (setDynFlag Opt_KeepSFiles)) Supported
1210 , Flag "keep-raw-s-file" (NoArg (setDynFlag Opt_KeepRawSFiles)) Supported
1211 , Flag "keep-raw-s-files" (NoArg (setDynFlag Opt_KeepRawSFiles)) Supported
1212 -- This only makes sense as plural
1213 , Flag "keep-tmp-files" (NoArg (setDynFlag Opt_KeepTmpFiles)) Supported
1215 ------- Miscellaneous ----------------------------------------------
1216 , Flag "no-auto-link-packages" (NoArg (unSetDynFlag Opt_AutoLinkPackages)) Supported
1217 , Flag "no-hs-main" (NoArg (setDynFlag Opt_NoHsMain)) Supported
1218 , Flag "main-is" (SepArg setMainIs ) Supported
1219 , Flag "haddock" (NoArg (setDynFlag Opt_Haddock)) Supported
1220 , Flag "haddock-opts" (HasArg (upd . addHaddockOpts)) Supported
1221 , Flag "hpcdir" (SepArg setOptHpcDir) Supported
1223 ------- recompilation checker --------------------------------------
1224 , Flag "recomp" (NoArg (unSetDynFlag Opt_ForceRecomp))
1225 (Deprecated "Use -fno-force-recomp instead")
1226 , Flag "no-recomp" (NoArg (setDynFlag Opt_ForceRecomp))
1227 (Deprecated "Use -fforce-recomp instead")
1229 ------ HsCpp opts ---------------------------------------------------
1230 , Flag "D" (AnySuffix (upd . addOptP)) Supported
1231 , Flag "U" (AnySuffix (upd . addOptP)) Supported
1233 ------- Include/Import Paths ----------------------------------------
1234 , Flag "I" (Prefix addIncludePath) Supported
1235 , Flag "i" (OptPrefix addImportPath ) Supported
1237 ------ Debugging ----------------------------------------------------
1238 , Flag "dstg-stats" (NoArg (setDynFlag Opt_StgStats)) Supported
1240 , Flag "ddump-cmm" (setDumpFlag Opt_D_dump_cmm)
1242 , Flag "ddump-cmmz" (setDumpFlag Opt_D_dump_cmmz)
1244 , Flag "ddump-cmmz-pretty" (setDumpFlag Opt_D_dump_cmmz_pretty)
1246 , Flag "ddump-cps-cmm" (setDumpFlag Opt_D_dump_cps_cmm)
1248 , Flag "ddump-cvt-cmm" (setDumpFlag Opt_D_dump_cvt_cmm)
1250 , Flag "ddump-asm" (setDumpFlag Opt_D_dump_asm)
1252 , Flag "ddump-asm-native" (setDumpFlag Opt_D_dump_asm_native)
1254 , Flag "ddump-asm-liveness" (setDumpFlag Opt_D_dump_asm_liveness)
1256 , Flag "ddump-asm-coalesce" (setDumpFlag Opt_D_dump_asm_coalesce)
1258 , Flag "ddump-asm-regalloc" (setDumpFlag Opt_D_dump_asm_regalloc)
1260 , Flag "ddump-asm-conflicts" (setDumpFlag Opt_D_dump_asm_conflicts)
1262 , Flag "ddump-asm-regalloc-stages"
1263 (setDumpFlag Opt_D_dump_asm_regalloc_stages)
1265 , Flag "ddump-asm-stats" (setDumpFlag Opt_D_dump_asm_stats)
1267 , Flag "ddump-cpranal" (setDumpFlag Opt_D_dump_cpranal)
1269 , Flag "ddump-deriv" (setDumpFlag Opt_D_dump_deriv)
1271 , Flag "ddump-ds" (setDumpFlag Opt_D_dump_ds)
1273 , Flag "ddump-flatC" (setDumpFlag Opt_D_dump_flatC)
1275 , Flag "ddump-foreign" (setDumpFlag Opt_D_dump_foreign)
1277 , Flag "ddump-inlinings" (setDumpFlag Opt_D_dump_inlinings)
1279 , Flag "ddump-rule-firings" (setDumpFlag Opt_D_dump_rule_firings)
1281 , Flag "ddump-occur-anal" (setDumpFlag Opt_D_dump_occur_anal)
1283 , Flag "ddump-parsed" (setDumpFlag Opt_D_dump_parsed)
1285 , Flag "ddump-rn" (setDumpFlag Opt_D_dump_rn)
1287 , Flag "ddump-simpl" (setDumpFlag Opt_D_dump_simpl)
1289 , Flag "ddump-simpl-iterations" (setDumpFlag Opt_D_dump_simpl_iterations)
1291 , Flag "ddump-simpl-phases" (OptPrefix setDumpSimplPhases)
1293 , Flag "ddump-spec" (setDumpFlag Opt_D_dump_spec)
1295 , Flag "ddump-prep" (setDumpFlag Opt_D_dump_prep)
1297 , Flag "ddump-stg" (setDumpFlag Opt_D_dump_stg)
1299 , Flag "ddump-stranal" (setDumpFlag Opt_D_dump_stranal)
1301 , Flag "ddump-tc" (setDumpFlag Opt_D_dump_tc)
1303 , Flag "ddump-types" (setDumpFlag Opt_D_dump_types)
1305 , Flag "ddump-rules" (setDumpFlag Opt_D_dump_rules)
1307 , Flag "ddump-cse" (setDumpFlag Opt_D_dump_cse)
1309 , Flag "ddump-worker-wrapper" (setDumpFlag Opt_D_dump_worker_wrapper)
1311 , Flag "ddump-rn-trace" (setDumpFlag Opt_D_dump_rn_trace)
1313 , Flag "ddump-if-trace" (setDumpFlag Opt_D_dump_if_trace)
1315 , Flag "ddump-tc-trace" (setDumpFlag Opt_D_dump_tc_trace)
1317 , Flag "ddump-splices" (setDumpFlag Opt_D_dump_splices)
1319 , Flag "ddump-rn-stats" (setDumpFlag Opt_D_dump_rn_stats)
1321 , Flag "ddump-opt-cmm" (setDumpFlag Opt_D_dump_opt_cmm)
1323 , Flag "ddump-simpl-stats" (setDumpFlag Opt_D_dump_simpl_stats)
1325 , Flag "ddump-bcos" (setDumpFlag Opt_D_dump_BCOs)
1327 , Flag "dsource-stats" (setDumpFlag Opt_D_source_stats)
1329 , Flag "dverbose-core2core" (NoArg setVerboseCore2Core)
1331 , Flag "dverbose-stg2stg" (setDumpFlag Opt_D_verbose_stg2stg)
1333 , Flag "ddump-hi" (setDumpFlag Opt_D_dump_hi)
1335 , Flag "ddump-minimal-imports" (setDumpFlag Opt_D_dump_minimal_imports)
1337 , Flag "ddump-vect" (setDumpFlag Opt_D_dump_vect)
1339 , Flag "ddump-hpc" (setDumpFlag Opt_D_dump_hpc)
1341 , Flag "ddump-mod-cycles" (setDumpFlag Opt_D_dump_mod_cycles)
1343 , Flag "ddump-view-pattern-commoning" (setDumpFlag Opt_D_dump_view_pattern_commoning)
1345 , Flag "ddump-to-file" (setDumpFlag Opt_DumpToFile)
1347 , Flag "ddump-hi-diffs" (setDumpFlag Opt_D_dump_hi_diffs)
1349 , Flag "ddump-rtti" (setDumpFlag Opt_D_dump_rtti)
1352 , Flag "dcore-lint" (NoArg (setDynFlag Opt_DoCoreLinting))
1354 , Flag "dstg-lint" (NoArg (setDynFlag Opt_DoStgLinting))
1356 , Flag "dcmm-lint" (NoArg (setDynFlag Opt_DoCmmLinting))
1358 , Flag "dasm-lint" (NoArg (setDynFlag Opt_DoAsmLinting))
1360 , Flag "dshow-passes"
1361 (NoArg (do forceRecompile
1362 setVerbosity (Just 2)))
1364 , Flag "dfaststring-stats" (NoArg (setDynFlag Opt_D_faststring_stats))
1367 ------ Machine dependant (-m<blah>) stuff ---------------------------
1369 , Flag "monly-2-regs" (NoArg (upd (\s -> s{stolen_x86_regs = 2}) ))
1371 , Flag "monly-3-regs" (NoArg (upd (\s -> s{stolen_x86_regs = 3}) ))
1373 , Flag "monly-4-regs" (NoArg (upd (\s -> s{stolen_x86_regs = 4}) ))
1376 ------ Warning opts -------------------------------------------------
1377 , Flag "W" (NoArg (mapM_ setDynFlag minusWOpts))
1379 , Flag "Werror" (NoArg (setDynFlag Opt_WarnIsError))
1381 , Flag "Wwarn" (NoArg (unSetDynFlag Opt_WarnIsError))
1383 , Flag "Wall" (NoArg (mapM_ setDynFlag minusWallOpts))
1385 , Flag "Wnot" (NoArg (mapM_ unSetDynFlag minusWallOpts))
1386 (Deprecated "Use -w instead")
1387 , Flag "w" (NoArg (mapM_ unSetDynFlag minuswRemovesOpts))
1390 ------ Optimisation flags ------------------------------------------
1391 , Flag "O" (NoArg (upd (setOptLevel 1))) Supported
1392 , Flag "Onot" (NoArg (upd (setOptLevel 0)))
1393 (Deprecated "Use -O0 instead")
1394 , Flag "Odph" (NoArg (upd setDPHOpt)) Supported
1395 , Flag "O" (OptIntSuffix (\mb_n -> upd (setOptLevel (mb_n `orElse` 1))))
1397 -- If the number is missing, use 1
1399 , Flag "fsimplifier-phases"
1400 (IntSuffix (\n -> upd (\dfs -> dfs{ simplPhases = n })))
1402 , Flag "fmax-simplifier-iterations"
1403 (IntSuffix (\n -> upd (\dfs -> dfs{ maxSimplIterations = n })))
1406 , Flag "fspec-constr-threshold"
1407 (IntSuffix (\n -> upd (\dfs -> dfs{ specConstrThreshold = Just n })))
1409 , Flag "fno-spec-constr-threshold"
1410 (NoArg (upd (\dfs -> dfs{ specConstrThreshold = Nothing })))
1412 , Flag "fspec-constr-count"
1413 (IntSuffix (\n -> upd (\dfs -> dfs{ specConstrCount = Just n })))
1415 , Flag "fno-spec-constr-count"
1416 (NoArg (upd (\dfs -> dfs{ specConstrCount = Nothing })))
1418 , Flag "fliberate-case-threshold"
1419 (IntSuffix (\n -> upd (\dfs -> dfs{ liberateCaseThreshold = Just n })))
1421 , Flag "fno-liberate-case-threshold"
1422 (NoArg (upd (\dfs -> dfs{ liberateCaseThreshold = Nothing })))
1425 , Flag "frule-check"
1426 (SepArg (\s -> upd (\dfs -> dfs{ ruleCheck = Just s })))
1428 , Flag "fcontext-stack"
1429 (IntSuffix $ \n -> upd $ \dfs -> dfs{ ctxtStkDepth = n })
1432 ------ DPH flags ----------------------------------------------------
1435 (NoArg (setDPHBackend DPHSeq))
1438 (NoArg (setDPHBackend DPHPar))
1441 (NoArg (setDPHBackend DPHThis))
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 package_flags :: [Flag DynP]
1466 ------- Packages ----------------------------------------------------
1467 Flag "package-conf" (HasArg extraPkgConf_) Supported
1468 , Flag "no-user-package-conf" (NoArg (unSetDynFlag Opt_ReadUserPackageConf))
1470 , Flag "package-name" (HasArg (upd . setPackageName)) Supported
1471 , Flag "package" (HasArg exposePackage) Supported
1472 , Flag "hide-package" (HasArg hidePackage) Supported
1473 , Flag "hide-all-packages" (NoArg (setDynFlag Opt_HideAllPackages))
1475 , Flag "ignore-package" (HasArg ignorePackage)
1477 , Flag "syslib" (HasArg exposePackage)
1478 (Deprecated "Use -package instead")
1481 mkFlag :: Bool -- ^ True <=> it should be turned on
1482 -> String -- ^ The flag prefix
1483 -> (DynFlag -> DynP ())
1484 -> (String, DynFlag, Bool -> Deprecated)
1486 mkFlag turnOn flagPrefix f (name, dynflag, deprecated)
1487 = Flag (flagPrefix ++ name) (NoArg (f dynflag)) (deprecated turnOn)
1489 deprecatedForLanguage :: String -> Bool -> Deprecated
1490 deprecatedForLanguage lang turn_on
1491 = Deprecated ("use -X" ++ flag ++ " or pragma {-# LANGUAGE " ++ flag ++ "#-} instead")
1493 flag | turn_on = lang
1494 | otherwise = "No"++lang
1496 useInstead :: String -> Bool -> Deprecated
1497 useInstead flag turn_on
1498 = Deprecated ("Use -f" ++ no ++ flag ++ " instead")
1500 no = if turn_on then "" else "no-"
1502 -- | These @-f\<blah\>@ flags can all be reversed with @-fno-\<blah\>@
1503 fFlags :: [(String, DynFlag, Bool -> Deprecated)]
1505 ( "warn-dodgy-foreign-imports", Opt_WarnDodgyForeignImports, const Supported ),
1506 ( "warn-dodgy-imports", Opt_WarnDodgyImports, const Supported ),
1507 ( "warn-duplicate-exports", Opt_WarnDuplicateExports, const Supported ),
1508 ( "warn-hi-shadowing", Opt_WarnHiShadows, const Supported ),
1509 ( "warn-implicit-prelude", Opt_WarnImplicitPrelude, const Supported ),
1510 ( "warn-incomplete-patterns", Opt_WarnIncompletePatterns, const Supported ),
1511 ( "warn-incomplete-record-updates", Opt_WarnIncompletePatternsRecUpd, const Supported ),
1512 ( "warn-missing-fields", Opt_WarnMissingFields, const Supported ),
1513 ( "warn-missing-methods", Opt_WarnMissingMethods, const Supported ),
1514 ( "warn-missing-signatures", Opt_WarnMissingSigs, const Supported ),
1515 ( "warn-name-shadowing", Opt_WarnNameShadowing, const Supported ),
1516 ( "warn-overlapping-patterns", Opt_WarnOverlappingPatterns, const Supported ),
1517 ( "warn-simple-patterns", Opt_WarnSimplePatterns, const Supported ),
1518 ( "warn-type-defaults", Opt_WarnTypeDefaults, const Supported ),
1519 ( "warn-monomorphism-restriction", Opt_WarnMonomorphism, const Supported ),
1520 ( "warn-unused-binds", Opt_WarnUnusedBinds, const Supported ),
1521 ( "warn-unused-imports", Opt_WarnUnusedImports, const Supported ),
1522 ( "warn-unused-matches", Opt_WarnUnusedMatches, const Supported ),
1523 ( "warn-warnings-deprecations", Opt_WarnWarningsDeprecations, const Supported ),
1524 ( "warn-deprecations", Opt_WarnWarningsDeprecations, const Supported ),
1525 ( "warn-deprecated-flags", Opt_WarnDeprecatedFlags, const Supported ),
1526 ( "warn-orphans", Opt_WarnOrphans, const Supported ),
1527 ( "warn-tabs", Opt_WarnTabs, const Supported ),
1528 ( "warn-unrecognised-pragmas", Opt_WarnUnrecognisedPragmas, const Supported ),
1529 ( "print-explicit-foralls", Opt_PrintExplicitForalls, const Supported ),
1530 ( "strictness", Opt_Strictness, const Supported ),
1531 ( "static-argument-transformation", Opt_StaticArgumentTransformation, const Supported ),
1532 ( "full-laziness", Opt_FullLaziness, const Supported ),
1533 ( "liberate-case", Opt_LiberateCase, const Supported ),
1534 ( "spec-constr", Opt_SpecConstr, const Supported ),
1535 ( "cse", Opt_CSE, const Supported ),
1536 ( "ignore-interface-pragmas", Opt_IgnoreInterfacePragmas, const Supported ),
1537 ( "omit-interface-pragmas", Opt_OmitInterfacePragmas, const Supported ),
1538 ( "do-lambda-eta-expansion", Opt_DoLambdaEtaExpansion, const Supported ),
1539 ( "ignore-asserts", Opt_IgnoreAsserts, const Supported ),
1540 ( "do-eta-reduction", Opt_DoEtaReduction, const Supported ),
1541 ( "case-merge", Opt_CaseMerge, const Supported ),
1542 ( "unbox-strict-fields", Opt_UnboxStrictFields, const Supported ),
1543 ( "method-sharing", Opt_MethodSharing, const Supported ),
1544 ( "dicts-cheap", Opt_DictsCheap, const Supported ),
1545 ( "excess-precision", Opt_ExcessPrecision, const Supported ),
1546 ( "asm-mangling", Opt_DoAsmMangling, const Supported ),
1547 ( "print-bind-result", Opt_PrintBindResult, const Supported ),
1548 ( "force-recomp", Opt_ForceRecomp, const Supported ),
1549 ( "hpc-no-auto", Opt_Hpc_No_Auto, const Supported ),
1550 ( "rewrite-rules", Opt_EnableRewriteRules, useInstead "enable-rewrite-rules" ),
1551 ( "enable-rewrite-rules", Opt_EnableRewriteRules, const Supported ),
1552 ( "break-on-exception", Opt_BreakOnException, const Supported ),
1553 ( "break-on-error", Opt_BreakOnError, const Supported ),
1554 ( "print-evld-with-show", Opt_PrintEvldWithShow, const Supported ),
1555 ( "print-bind-contents", Opt_PrintBindContents, const Supported ),
1556 ( "run-cps", Opt_RunCPSZ, const Supported ),
1557 ( "convert-to-zipper-and-back", Opt_ConvertToZipCfgAndBack, const Supported ),
1558 ( "vectorise", Opt_Vectorise, const Supported ),
1559 ( "regs-graph", Opt_RegsGraph, const Supported ),
1560 ( "regs-iterative", Opt_RegsIterative, const Supported ),
1561 ( "th", Opt_TemplateHaskell,
1562 deprecatedForLanguage "TemplateHaskell" ),
1563 ( "fi", Opt_ForeignFunctionInterface,
1564 deprecatedForLanguage "ForeignFunctionInterface" ),
1565 ( "ffi", Opt_ForeignFunctionInterface,
1566 deprecatedForLanguage "ForeignFunctionInterface" ),
1567 ( "arrows", Opt_Arrows,
1568 deprecatedForLanguage "Arrows" ),
1569 ( "generics", Opt_Generics,
1570 deprecatedForLanguage "Generics" ),
1571 ( "implicit-prelude", Opt_ImplicitPrelude,
1572 deprecatedForLanguage "ImplicitPrelude" ),
1573 ( "bang-patterns", Opt_BangPatterns,
1574 deprecatedForLanguage "BangPatterns" ),
1575 ( "monomorphism-restriction", Opt_MonomorphismRestriction,
1576 deprecatedForLanguage "MonomorphismRestriction" ),
1577 ( "mono-pat-binds", Opt_MonoPatBinds,
1578 deprecatedForLanguage "MonoPatBinds" ),
1579 ( "extended-default-rules", Opt_ExtendedDefaultRules,
1580 deprecatedForLanguage "ExtendedDefaultRules" ),
1581 ( "implicit-params", Opt_ImplicitParams,
1582 deprecatedForLanguage "ImplicitParams" ),
1583 ( "scoped-type-variables", Opt_ScopedTypeVariables,
1584 deprecatedForLanguage "ScopedTypeVariables" ),
1586 deprecatedForLanguage "PArr" ),
1587 ( "allow-overlapping-instances", Opt_OverlappingInstances,
1588 deprecatedForLanguage "OverlappingInstances" ),
1589 ( "allow-undecidable-instances", Opt_UndecidableInstances,
1590 deprecatedForLanguage "UndecidableInstances" ),
1591 ( "allow-incoherent-instances", Opt_IncoherentInstances,
1592 deprecatedForLanguage "IncoherentInstances" ),
1593 ( "gen-manifest", Opt_GenManifest, const Supported ),
1594 ( "embed-manifest", Opt_EmbedManifest, const Supported ),
1595 ( "implicit-import-qualified", Opt_ImplicitImportQualified, const Supported )
1598 supportedLanguages :: [String]
1599 supportedLanguages = [ name | (name, _, _) <- xFlags ]
1601 -- This may contain duplicates
1602 languageOptions :: [DynFlag]
1603 languageOptions = [ dynFlag | (_, dynFlag, _) <- xFlags ]
1605 -- | These -X<blah> flags can all be reversed with -XNo<blah>
1606 xFlags :: [(String, DynFlag, Bool -> Deprecated)]
1608 ( "CPP", Opt_Cpp, const Supported ),
1609 ( "PostfixOperators", Opt_PostfixOperators, const Supported ),
1610 ( "PatternGuards", Opt_PatternGuards, const Supported ),
1611 ( "UnicodeSyntax", Opt_UnicodeSyntax, const Supported ),
1612 ( "MagicHash", Opt_MagicHash, const Supported ),
1613 ( "PolymorphicComponents", Opt_PolymorphicComponents, const Supported ),
1614 ( "ExistentialQuantification", Opt_ExistentialQuantification, const Supported ),
1615 ( "KindSignatures", Opt_KindSignatures, const Supported ),
1616 ( "EmptyDataDecls", Opt_EmptyDataDecls, const Supported ),
1617 ( "ParallelListComp", Opt_ParallelListComp, const Supported ),
1618 ( "TransformListComp", Opt_TransformListComp, const Supported ),
1619 ( "ForeignFunctionInterface", Opt_ForeignFunctionInterface, const Supported ),
1620 ( "UnliftedFFITypes", Opt_UnliftedFFITypes, const Supported ),
1621 ( "LiberalTypeSynonyms", Opt_LiberalTypeSynonyms, const Supported ),
1622 ( "Rank2Types", Opt_Rank2Types, const Supported ),
1623 ( "RankNTypes", Opt_RankNTypes, const Supported ),
1624 ( "ImpredicativeTypes", Opt_ImpredicativeTypes, const Supported ),
1625 ( "TypeOperators", Opt_TypeOperators, const Supported ),
1626 ( "RecursiveDo", Opt_RecursiveDo, const Supported ),
1627 ( "Arrows", Opt_Arrows, const Supported ),
1628 ( "PArr", Opt_PArr, const Supported ),
1629 ( "TemplateHaskell", Opt_TemplateHaskell, const Supported ),
1630 ( "QuasiQuotes", Opt_QuasiQuotes, const Supported ),
1631 ( "Generics", Opt_Generics, const Supported ),
1633 ( "ImplicitPrelude", Opt_ImplicitPrelude, const Supported ),
1634 ( "RecordWildCards", Opt_RecordWildCards, const Supported ),
1635 ( "NamedFieldPuns", Opt_RecordPuns, const Supported ),
1636 ( "RecordPuns", Opt_RecordPuns,
1637 deprecatedForLanguage "NamedFieldPuns" ),
1638 ( "DisambiguateRecordFields", Opt_DisambiguateRecordFields, const Supported ),
1639 ( "OverloadedStrings", Opt_OverloadedStrings, const Supported ),
1640 ( "GADTs", Opt_GADTs, const Supported ),
1641 ( "ViewPatterns", Opt_ViewPatterns, const Supported ),
1642 ( "TypeFamilies", Opt_TypeFamilies, const Supported ),
1643 ( "BangPatterns", Opt_BangPatterns, const Supported ),
1645 ( "MonomorphismRestriction", Opt_MonomorphismRestriction, const Supported ),
1646 -- On by default (which is not strictly H98):
1647 ( "MonoPatBinds", Opt_MonoPatBinds, const Supported ),
1648 ( "RelaxedPolyRec", Opt_RelaxedPolyRec, const Supported ),
1649 ( "ExtendedDefaultRules", Opt_ExtendedDefaultRules, const Supported ),
1650 ( "ImplicitParams", Opt_ImplicitParams, const Supported ),
1651 ( "ScopedTypeVariables", Opt_ScopedTypeVariables, const Supported ),
1653 ( "PatternSignatures", Opt_ScopedTypeVariables,
1654 deprecatedForLanguage "ScopedTypeVariables" ),
1656 ( "UnboxedTuples", Opt_UnboxedTuples, const Supported ),
1657 ( "StandaloneDeriving", Opt_StandaloneDeriving, const Supported ),
1658 ( "DeriveDataTypeable", Opt_DeriveDataTypeable, const Supported ),
1659 ( "TypeSynonymInstances", Opt_TypeSynonymInstances, const Supported ),
1660 ( "FlexibleContexts", Opt_FlexibleContexts, const Supported ),
1661 ( "FlexibleInstances", Opt_FlexibleInstances, const Supported ),
1662 ( "ConstrainedClassMethods", Opt_ConstrainedClassMethods, const Supported ),
1663 ( "MultiParamTypeClasses", Opt_MultiParamTypeClasses, const Supported ),
1664 ( "FunctionalDependencies", Opt_FunctionalDependencies, const Supported ),
1665 ( "GeneralizedNewtypeDeriving", Opt_GeneralizedNewtypeDeriving, const Supported ),
1666 ( "OverlappingInstances", Opt_OverlappingInstances, const Supported ),
1667 ( "UndecidableInstances", Opt_UndecidableInstances, const Supported ),
1668 ( "IncoherentInstances", Opt_IncoherentInstances, const Supported ),
1669 ( "PackageImports", Opt_PackageImports, const Supported ),
1670 ( "NewQualifiedOperators", Opt_NewQualifiedOperators, const Supported )
1673 impliedFlags :: [(DynFlag, DynFlag)]
1675 = [ (Opt_GADTs, Opt_RelaxedPolyRec) -- We want type-sig variables to
1676 -- be completely rigid for GADTs
1678 , (Opt_ScopedTypeVariables, Opt_RelaxedPolyRec) -- Ditto for scoped type variables; see
1679 -- Note [Scoped tyvars] in TcBinds
1682 glasgowExtsFlags :: [DynFlag]
1683 glasgowExtsFlags = [
1684 Opt_PrintExplicitForalls
1685 , Opt_ForeignFunctionInterface
1686 , Opt_UnliftedFFITypes
1688 , Opt_ImplicitParams
1689 , Opt_ScopedTypeVariables
1691 , Opt_TypeSynonymInstances
1692 , Opt_StandaloneDeriving
1693 , Opt_DeriveDataTypeable
1694 , Opt_FlexibleContexts
1695 , Opt_FlexibleInstances
1696 , Opt_ConstrainedClassMethods
1697 , Opt_MultiParamTypeClasses
1698 , Opt_FunctionalDependencies
1700 , Opt_PolymorphicComponents
1701 , Opt_ExistentialQuantification
1703 , Opt_PostfixOperators
1705 , Opt_LiberalTypeSynonyms
1707 , Opt_ImpredicativeTypes
1710 , Opt_ParallelListComp
1711 , Opt_EmptyDataDecls
1712 , Opt_KindSignatures
1713 , Opt_GeneralizedNewtypeDeriving
1714 , Opt_TypeFamilies ]
1716 -- -----------------------------------------------------------------------------
1717 -- Parsing the dynamic flags.
1719 -- | Parse dynamic flags from a list of command line arguments. Returns the
1720 -- the parsed 'DynFlags', the left-over arguments, and a list of warnings.
1721 -- Throws a 'UsageError' if errors occurred during parsing (such as unknown
1722 -- flags or missing arguments).
1723 parseDynamicFlags :: Monad m =>
1724 DynFlags -> [Located String]
1725 -> m (DynFlags, [Located String], [Located String])
1726 -- ^ Updated 'DynFlags', left-over arguments, and
1727 -- list of warnings.
1728 parseDynamicFlags dflags args = parseDynamicFlags_ dflags args True
1730 -- | Like 'parseDynamicFlags' but does not allow the package flags (-package,
1731 -- -hide-package, -ignore-package, -hide-all-packages, -package-conf).
1732 parseDynamicNoPackageFlags :: Monad m =>
1733 DynFlags -> [Located String]
1734 -> m (DynFlags, [Located String], [Located String])
1735 -- ^ Updated 'DynFlags', left-over arguments, and
1736 -- list of warnings.
1737 parseDynamicNoPackageFlags dflags args = parseDynamicFlags_ dflags args False
1739 parseDynamicFlags_ :: Monad m =>
1740 DynFlags -> [Located String] -> Bool
1741 -> m (DynFlags, [Located String], [Located String])
1742 parseDynamicFlags_ dflags args pkg_flags = do
1743 -- XXX Legacy support code
1744 -- We used to accept things like
1745 -- optdep-f -optdepdepend
1746 -- optdep-f -optdep depend
1747 -- optdep -f -optdepdepend
1748 -- optdep -f -optdep depend
1749 -- but the spaces trip up proper argument handling. So get rid of them.
1750 let f (L p "-optdep" : L _ x : xs) = (L p ("-optdep" ++ x)) : f xs
1751 f (x : xs) = x : f xs
1755 flag_spec | pkg_flags = dynamic_flags ++ package_flags
1756 | otherwise = dynamic_flags
1758 let ((leftover, errs, warns), dflags')
1759 = runCmdLine (processArgs flag_spec args') dflags
1760 when (not (null errs)) $ ghcError $ errorsToGhcException errs
1761 return (dflags', leftover, warns)
1763 type DynP = CmdLineP DynFlags
1765 upd :: (DynFlags -> DynFlags) -> DynP ()
1767 dfs <- getCmdLineState
1768 putCmdLineState $! (f dfs)
1770 --------------------------
1771 setDynFlag, unSetDynFlag :: DynFlag -> DynP ()
1772 setDynFlag f = do { upd (\dfs -> dopt_set dfs f)
1773 ; mapM_ setDynFlag deps }
1775 deps = [ d | (f', d) <- impliedFlags, f' == f ]
1776 -- When you set f, set the ones it implies
1777 -- NB: use setDynFlag recursively, in case the implied flags
1778 -- implies further flags
1779 -- When you un-set f, however, we don't un-set the things it implies
1780 -- (except for -fno-glasgow-exts, which is treated specially)
1782 unSetDynFlag f = upd (\dfs -> dopt_unset dfs f)
1784 --------------------------
1785 setDumpFlag :: DynFlag -> OptKind DynP
1786 setDumpFlag dump_flag
1787 = NoArg (setDynFlag dump_flag >> when want_recomp forceRecompile)
1789 -- Certain dumpy-things are really interested in what's going
1790 -- on during recompilation checking, so in those cases we
1791 -- don't want to turn it off.
1792 want_recomp = dump_flag `notElem` [Opt_D_dump_if_trace,
1793 Opt_D_dump_hi_diffs]
1795 forceRecompile :: DynP ()
1796 -- Whenver we -ddump, force recompilation (by switching off the
1797 -- recompilation checker), else you don't see the dump! However,
1798 -- don't switch it off in --make mode, else *everything* gets
1799 -- recompiled which probably isn't what you want
1800 forceRecompile = do { dfs <- getCmdLineState
1801 ; when (force_recomp dfs) (setDynFlag Opt_ForceRecomp) }
1803 force_recomp dfs = isOneShot (ghcMode dfs)
1805 setVerboseCore2Core :: DynP ()
1806 setVerboseCore2Core = do setDynFlag Opt_D_verbose_core2core
1808 upd (\s -> s { shouldDumpSimplPhase = const True })
1810 setDumpSimplPhases :: String -> DynP ()
1811 setDumpSimplPhases s = do forceRecompile
1812 upd (\s -> s { shouldDumpSimplPhase = spec })
1814 spec :: SimplifierMode -> Bool
1816 . map (join (&&) . map match . split ':')
1822 join :: (Bool -> Bool -> Bool)
1823 -> [SimplifierMode -> Bool]
1824 -> SimplifierMode -> Bool
1825 join _ [] = const True
1826 join op ss = foldr1 (\f g x -> f x `op` g x) ss
1828 match :: String -> SimplifierMode -> Bool
1829 match "" = const True
1830 match s = case reads s of
1831 [(n,"")] -> phase_num n
1834 phase_num :: Int -> SimplifierMode -> Bool
1835 phase_num n (SimplPhase k _) = n == k
1836 phase_num _ _ = False
1838 phase_name :: String -> SimplifierMode -> Bool
1839 phase_name s SimplGently = s == "gentle"
1840 phase_name s (SimplPhase _ ss) = s `elem` ss
1842 setVerbosity :: Maybe Int -> DynP ()
1843 setVerbosity mb_n = upd (\dfs -> dfs{ verbosity = mb_n `orElse` 3 })
1845 addCmdlineHCInclude :: String -> DynP ()
1846 addCmdlineHCInclude a = upd (\s -> s{cmdlineHcIncludes = a : cmdlineHcIncludes s})
1848 extraPkgConf_ :: FilePath -> DynP ()
1849 extraPkgConf_ p = upd (\s -> s{ extraPkgConfs = p : extraPkgConfs s })
1851 exposePackage, hidePackage, ignorePackage :: String -> DynP ()
1853 upd (\s -> s{ packageFlags = ExposePackage p : packageFlags s })
1855 upd (\s -> s{ packageFlags = HidePackage p : packageFlags s })
1857 upd (\s -> s{ packageFlags = IgnorePackage p : packageFlags s })
1859 setPackageName :: String -> DynFlags -> DynFlags
1861 | Nothing <- unpackPackageId pid
1862 = ghcError (CmdLineError ("cannot parse \'" ++ p ++ "\' as a package identifier"))
1864 = \s -> s{ thisPackage = pid }
1866 pid = stringToPackageId p
1868 -- If we're linking a binary, then only targets that produce object
1869 -- code are allowed (requests for other target types are ignored).
1870 setTarget :: HscTarget -> DynP ()
1871 setTarget l = upd set
1874 | ghcLink dfs /= LinkBinary || isObjectTarget l = dfs{ hscTarget = l }
1877 -- Changes the target only if we're compiling object code. This is
1878 -- used by -fasm and -fvia-C, which switch from one to the other, but
1879 -- not from bytecode to object-code. The idea is that -fasm/-fvia-C
1880 -- can be safely used in an OPTIONS_GHC pragma.
1881 setObjTarget :: HscTarget -> DynP ()
1882 setObjTarget l = upd set
1885 | isObjectTarget (hscTarget dfs) = dfs { hscTarget = l }
1888 setOptLevel :: Int -> DynFlags -> DynFlags
1889 setOptLevel n dflags
1890 | hscTarget dflags == HscInterpreted && n > 0
1892 -- not in IO any more, oh well:
1893 -- putStr "warning: -O conflicts with --interactive; -O ignored.\n"
1895 = updOptLevel n dflags
1898 -- -Odph is equivalent to
1900 -- -O2 optimise as much as possible
1901 -- -fno-method-sharing sharing specialisation defeats fusion
1903 -- -fdicts-cheap always inline dictionaries
1904 -- -fmax-simplifier-iterations20 this is necessary sometimes
1905 -- -fno-spec-constr-threshold run SpecConstr even for big loops
1906 -- -fno-spec-constr-count SpecConstr as much as possible
1908 setDPHOpt :: DynFlags -> DynFlags
1909 setDPHOpt dflags = setOptLevel 2 (dflags { maxSimplIterations = 20
1910 , specConstrThreshold = Nothing
1911 , specConstrCount = Nothing
1913 `dopt_set` Opt_DictsCheap
1914 `dopt_unset` Opt_MethodSharing
1916 data DPHBackend = DPHPar
1919 deriving(Eq, Ord, Enum, Show)
1921 setDPHBackend :: DPHBackend -> DynP ()
1922 setDPHBackend backend
1924 upd $ \dflags -> dflags { dphBackend = backend }
1925 mapM_ exposePackage (dph_packages backend)
1927 dph_packages DPHThis = []
1928 dph_packages DPHPar = ["dph-prim-par", "dph-par"]
1929 dph_packages DPHSeq = ["dph-prim-seq", "dph-seq"]
1931 dphPackage :: DynFlags -> PackageId
1932 dphPackage dflags = case dphBackend dflags of
1933 DPHPar -> dphParPackageId
1934 DPHSeq -> dphSeqPackageId
1935 DPHThis -> thisPackage dflags
1937 setMainIs :: String -> DynP ()
1939 | not (null main_fn) && isLower (head main_fn)
1940 -- The arg looked like "Foo.Bar.baz"
1941 = upd $ \d -> d{ mainFunIs = Just main_fn,
1942 mainModIs = mkModule mainPackageId (mkModuleName main_mod) }
1944 | isUpper (head arg) -- The arg looked like "Foo" or "Foo.Bar"
1945 = upd $ \d -> d{ mainModIs = mkModule mainPackageId (mkModuleName arg) }
1947 | otherwise -- The arg looked like "baz"
1948 = upd $ \d -> d{ mainFunIs = Just arg }
1950 (main_mod, main_fn) = splitLongestPrefix arg (== '.')
1952 -- | Get the unqualified name of the function to use as the \"main\" for the main module.
1953 -- Either returns the default name or the one configured on the command line with -main-is
1954 getMainFun :: DynFlags -> RdrName
1955 getMainFun dflags = case (mainFunIs dflags) of
1956 Just fn -> mkRdrUnqual (mkVarOccFS (mkFastString fn))
1957 Nothing -> main_RDR_Unqual
1959 -----------------------------------------------------------------------------
1960 -- Paths & Libraries
1962 addImportPath, addLibraryPath, addIncludePath, addFrameworkPath :: FilePath -> DynP ()
1964 -- -i on its own deletes the import paths
1965 addImportPath "" = upd (\s -> s{importPaths = []})
1966 addImportPath p = upd (\s -> s{importPaths = importPaths s ++ splitPathList p})
1970 upd (\s -> s{libraryPaths = libraryPaths s ++ splitPathList p})
1973 upd (\s -> s{includePaths = includePaths s ++ splitPathList p})
1975 addFrameworkPath p =
1976 upd (\s -> s{frameworkPaths = frameworkPaths s ++ splitPathList p})
1978 #ifndef mingw32_TARGET_OS
1979 split_marker :: Char
1980 split_marker = ':' -- not configurable (ToDo)
1983 splitPathList :: String -> [String]
1984 splitPathList s = filter notNull (splitUp s)
1985 -- empty paths are ignored: there might be a trailing
1986 -- ':' in the initial list, for example. Empty paths can
1987 -- cause confusion when they are translated into -I options
1988 -- for passing to gcc.
1990 #ifndef mingw32_TARGET_OS
1991 splitUp xs = split split_marker xs
1993 -- Windows: 'hybrid' support for DOS-style paths in directory lists.
1995 -- That is, if "foo:bar:baz" is used, this interpreted as
1996 -- consisting of three entries, 'foo', 'bar', 'baz'.
1997 -- However, with "c:/foo:c:\\foo;x:/bar", this is interpreted
1998 -- as 3 elts, "c:/foo", "c:\\foo", "x:/bar"
2000 -- Notice that no attempt is made to fully replace the 'standard'
2001 -- split marker ':' with the Windows / DOS one, ';'. The reason being
2002 -- that this will cause too much breakage for users & ':' will
2003 -- work fine even with DOS paths, if you're not insisting on being silly.
2006 splitUp (x:':':div:xs) | div `elem` dir_markers
2007 = ((x:':':div:p): splitUp rs)
2009 (p,rs) = findNextPath xs
2010 -- we used to check for existence of the path here, but that
2011 -- required the IO monad to be threaded through the command-line
2012 -- parser which is quite inconvenient. The
2013 splitUp xs = cons p (splitUp rs)
2015 (p,rs) = findNextPath xs
2020 -- will be called either when we've consumed nought or the
2021 -- "<Drive>:/" part of a DOS path, so splitting is just a Q of
2022 -- finding the next split marker.
2024 case break (`elem` split_markers) xs of
2025 (p, _:ds) -> (p, ds)
2028 split_markers :: [Char]
2029 split_markers = [':', ';']
2031 dir_markers :: [Char]
2032 dir_markers = ['/', '\\']
2035 -- -----------------------------------------------------------------------------
2036 -- tmpDir, where we store temporary files.
2038 setTmpDir :: FilePath -> DynFlags -> DynFlags
2039 setTmpDir dir dflags = dflags{ tmpDir = normalise dir }
2040 -- we used to fix /cygdrive/c/.. on Windows, but this doesn't
2041 -- seem necessary now --SDM 7/2/2008
2043 -----------------------------------------------------------------------------
2046 setOptHpcDir :: String -> DynP ()
2047 setOptHpcDir arg = upd $ \ d -> d{hpcDir = arg}
2049 -----------------------------------------------------------------------------
2050 -- Via-C compilation stuff
2052 -- There are some options that we need to pass to gcc when compiling
2053 -- Haskell code via C, but are only supported by recent versions of
2054 -- gcc. The configure script decides which of these options we need,
2055 -- and puts them in the file "extra-gcc-opts" in $topdir, which is
2056 -- read before each via-C compilation. The advantage of having these
2057 -- in a separate file is that the file can be created at install-time
2058 -- depending on the available gcc version, and even re-generated later
2059 -- if gcc is upgraded.
2061 -- The options below are not dependent on the version of gcc, only the
2064 machdepCCOpts :: DynFlags -> ([String], -- flags for all C compilations
2065 [String]) -- for registerised HC compilations
2066 machdepCCOpts _dflags
2067 #if alpha_TARGET_ARCH
2069 #ifdef HAVE_THREADED_RTS_SUPPORT
2073 -- For now, to suppress the gcc warning "call-clobbered
2074 -- register used for global register variable", we simply
2075 -- disable all warnings altogether using the -w flag. Oh well.
2077 #elif hppa_TARGET_ARCH
2078 -- ___HPUX_SOURCE, not _HPUX_SOURCE, is #defined if -ansi!
2079 -- (very nice, but too bad the HP /usr/include files don't agree.)
2080 = ( ["-D_HPUX_SOURCE"], [] )
2082 #elif m68k_TARGET_ARCH
2083 -- -fno-defer-pop : for the .hc files, we want all the pushing/
2084 -- popping of args to routines to be explicit; if we let things
2085 -- be deferred 'til after an STGJUMP, imminent death is certain!
2087 -- -fomit-frame-pointer : *don't*
2088 -- It's better to have a6 completely tied up being a frame pointer
2089 -- rather than let GCC pick random things to do with it.
2090 -- (If we want to steal a6, then we would try to do things
2091 -- as on iX86, where we *do* steal the frame pointer [%ebp].)
2092 = ( [], ["-fno-defer-pop", "-fno-omit-frame-pointer"] )
2094 #elif i386_TARGET_ARCH
2095 -- -fno-defer-pop : basically the same game as for m68k
2097 -- -fomit-frame-pointer : *must* in .hc files; because we're stealing
2098 -- the fp (%ebp) for our register maps.
2099 = let n_regs = stolen_x86_regs _dflags
2102 ( [ if sta then "-DDONT_WANT_WIN32_DLL_SUPPORT" else ""
2105 "-fomit-frame-pointer",
2106 -- we want -fno-builtin, because when gcc inlines
2107 -- built-in functions like memcpy() it tends to
2108 -- run out of registers, requiring -monly-n-regs
2110 "-DSTOLEN_X86_REGS="++show n_regs ]
2113 #elif ia64_TARGET_ARCH
2114 = ( [], ["-fomit-frame-pointer", "-G0"] )
2116 #elif x86_64_TARGET_ARCH
2117 = ( [], ["-fomit-frame-pointer",
2118 "-fno-asynchronous-unwind-tables",
2119 -- the unwind tables are unnecessary for HC code,
2120 -- and get in the way of -split-objs. Another option
2121 -- would be to throw them away in the mangler, but this
2124 -- calling builtins like strlen() using the FFI can
2125 -- cause gcc to run out of regs, so use the external
2129 #elif sparc_TARGET_ARCH
2131 -- For now, to suppress the gcc warning "call-clobbered
2132 -- register used for global register variable", we simply
2133 -- disable all warnings altogether using the -w flag. Oh well.
2135 #elif powerpc_apple_darwin_TARGET
2137 -- Disable Apple's precompiling preprocessor. It's a great thing
2138 -- for "normal" programs, but it doesn't support register variable
2140 = ( [], ["-no-cpp-precomp"] )
2145 picCCOpts :: DynFlags -> [String]
2147 #if darwin_TARGET_OS
2148 -- Apple prefers to do things the other way round.
2149 -- PIC is on by default.
2150 -- -mdynamic-no-pic:
2151 -- Turn off PIC code generation.
2153 -- Don't generate "common" symbols - these are unwanted
2154 -- in dynamic libraries.
2157 = ["-fno-common", "-D__PIC__"]
2159 = ["-mdynamic-no-pic"]
2160 #elif mingw32_TARGET_OS
2161 -- no -fPIC for Windows
2168 = ["-fPIC", "-D__PIC__"]
2173 -- -----------------------------------------------------------------------------
2177 can_split = cSplitObjs == "YES"
2179 -- -----------------------------------------------------------------------------
2182 compilerInfo :: [(String, String)]
2183 compilerInfo = [("Project name", cProjectName),
2184 ("Project version", cProjectVersion),
2185 ("Booter version", cBooterVersion),
2187 ("Interface file version", cHscIfaceFileVersion),
2188 ("Have interpreter", cGhcWithInterpreter),
2189 ("Object splitting", cSplitObjs),
2190 ("Have native code generator", cGhcWithNativeCodeGen),
2191 ("Support SMP", cGhcWithSMP),
2192 ("Unregisterised", cGhcUnregisterised),
2193 ("Tables next to code", cGhcEnableTablesNextToCode),
2194 ("Win32 DLLs", cEnableWin32DLLs),
2195 ("RTS ways", cGhcRTSWays),
2196 ("Leading underscore", cLeadingUnderscore),
2197 ("Debug on", show debugIsOn)