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
299 | Opt_KeepRawTokenStream
303 -- | Contains not only a collection of 'DynFlag's but also a plethora of
304 -- information relating to the compilation of a single file or GHC session
305 data DynFlags = DynFlags {
308 coreToDo :: Maybe [CoreToDo], -- reserved for -Ofile
309 stgToDo :: Maybe [StgToDo], -- similarly
310 hscTarget :: HscTarget,
311 hscOutName :: String, -- ^ Name of the output file
312 extCoreName :: String, -- ^ Name of the .hcr output file
313 verbosity :: Int, -- ^ Verbosity level: see "DynFlags#verbosity_levels"
314 optLevel :: Int, -- ^ Optimisation level
315 simplPhases :: Int, -- ^ Number of simplifier phases
316 maxSimplIterations :: Int, -- ^ Max simplifier iterations
317 shouldDumpSimplPhase :: SimplifierMode -> Bool,
318 ruleCheck :: Maybe String,
320 specConstrThreshold :: Maybe Int, -- ^ Threshold for SpecConstr
321 specConstrCount :: Maybe Int, -- ^ Max number of specialisations for any one function
322 liberateCaseThreshold :: Maybe Int, -- ^ Threshold for LiberateCase
324 stolen_x86_regs :: Int,
325 cmdlineHcIncludes :: [String], -- ^ @\-\#includes@
326 importPaths :: [FilePath],
328 mainFunIs :: Maybe String,
329 ctxtStkDepth :: Int, -- ^ Typechecker context stack depth
331 dphBackend :: DPHBackend,
333 thisPackage :: PackageId, -- ^ name of package currently being compiled
336 wayNames :: [WayName], -- ^ Way flags from the command line
337 buildTag :: String, -- ^ The global \"way\" (e.g. \"p\" for prof)
338 rtsBuildTag :: String, -- ^ The RTS \"way\"
341 objectDir :: Maybe String,
342 hiDir :: Maybe String,
343 stubDir :: Maybe String,
349 outputFile :: Maybe String,
350 outputHi :: Maybe String,
351 dynLibLoader :: DynLibLoader,
353 -- | This is set by 'DriverPipeline.runPipeline' based on where
354 -- its output is going.
355 dumpPrefix :: Maybe FilePath,
357 -- | Override the 'dumpPrefix' set by 'DriverPipeline.runPipeline'.
358 -- Set by @-ddump-file-prefix@
359 dumpPrefixForce :: Maybe FilePath,
361 includePaths :: [String],
362 libraryPaths :: [String],
363 frameworkPaths :: [String], -- used on darwin only
364 cmdlineFrameworks :: [String], -- ditto
365 tmpDir :: String, -- no trailing '/'
367 ghcUsagePath :: FilePath, -- Filled in by SysTools
368 ghciUsagePath :: FilePath, -- ditto
370 hpcDir :: String, -- ^ Path to store the .mix files
372 -- options for particular phases
380 opt_windres :: [String],
382 -- commands for particular phases
384 pgm_P :: (String,[Option]),
386 pgm_c :: (String,[Option]),
387 pgm_m :: (String,[Option]),
388 pgm_s :: (String,[Option]),
389 pgm_a :: (String,[Option]),
390 pgm_l :: (String,[Option]),
391 pgm_dll :: (String,[Option]),
393 pgm_sysman :: String,
394 pgm_windres :: String,
397 depMakefile :: FilePath,
398 depIncludePkgDeps :: Bool,
399 depExcludeMods :: [ModuleName],
400 depSuffixes :: [String],
404 extraPkgConfs :: [FilePath],
405 topDir :: FilePath, -- filled in by SysTools
406 systemPackageConfig :: FilePath, -- ditto
407 -- ^ The @-package-conf@ flags given on the command line, in the order
410 packageFlags :: [PackageFlag],
411 -- ^ The @-package@ and @-hide-package@ flags from the command-line
414 -- NB. do not modify this field, it is calculated by
415 -- Packages.initPackages and Packages.updatePackages.
416 pkgDatabase :: Maybe (UniqFM PackageConfig),
417 pkgState :: PackageState,
422 -- | Message output action: use "ErrUtils" instead of this if you can
423 log_action :: Severity -> SrcSpan -> PprStyle -> Message -> IO (),
425 haddockOptions :: Maybe String
436 -- | Will this target result in an object file on the disk?
437 isObjectTarget :: HscTarget -> Bool
438 isObjectTarget HscC = True
439 isObjectTarget HscAsm = True
440 isObjectTarget _ = False
442 -- | The 'GhcMode' tells us whether we're doing multi-module
443 -- compilation (controlled via the "GHC" API) or one-shot
444 -- (single-module) compilation. This makes a difference primarily to
445 -- the "Finder": in one-shot mode we look for interface files for
446 -- imported modules, but in multi-module mode we look for source files
447 -- in order to check whether they need to be recompiled.
449 = CompManager -- ^ @\-\-make@, GHCi, etc.
450 | OneShot -- ^ @ghc -c Foo.hs@
451 | MkDepend -- ^ @ghc -M@, see "Finder" for why we need this
454 instance Outputable GhcMode where
455 ppr CompManager = ptext (sLit "CompManager")
456 ppr OneShot = ptext (sLit "OneShot")
457 ppr MkDepend = ptext (sLit "MkDepend")
459 isOneShot :: GhcMode -> Bool
460 isOneShot OneShot = True
461 isOneShot _other = False
463 -- | What to do in the link step, if there is one.
465 = NoLink -- ^ Don't link at all
466 | LinkBinary -- ^ Link object code into a binary
467 | LinkInMemory -- ^ Use the in-memory dynamic linker
468 | LinkDynLib -- ^ Link objects into a dynamic lib (DLL on Windows, DSO on ELF platforms)
471 isNoLink :: GhcLink -> Bool
472 isNoLink NoLink = True
476 = ExposePackage String
478 | IgnorePackage String
481 defaultHscTarget :: HscTarget
482 defaultHscTarget = defaultObjectTarget
484 -- | The 'HscTarget' value corresponding to the default way to create
485 -- object files on the current platform.
486 defaultObjectTarget :: HscTarget
488 | cGhcWithNativeCodeGen == "YES" = HscAsm
493 | Wrapped (Maybe String)
497 -- | Used by 'GHC.newSession' to partially initialize a new 'DynFlags' value
498 initDynFlags :: DynFlags -> IO DynFlags
499 initDynFlags dflags = do
500 -- someday these will be dynamic flags
501 ways <- readIORef v_Ways
502 build_tag <- readIORef v_Build_tag
503 rts_build_tag <- readIORef v_RTS_Build_tag
506 buildTag = build_tag,
507 rtsBuildTag = rts_build_tag
510 -- | The normal 'DynFlags'. Note that they is not suitable for use in this form
511 -- and must be fully initialized by 'GHC.newSession' first.
512 defaultDynFlags :: DynFlags
515 ghcMode = CompManager,
516 ghcLink = LinkBinary,
519 hscTarget = defaultHscTarget,
525 maxSimplIterations = 4,
526 shouldDumpSimplPhase = const False,
528 specConstrThreshold = Just 200,
529 specConstrCount = Just 3,
530 liberateCaseThreshold = Just 200,
532 cmdlineHcIncludes = [],
536 ctxtStkDepth = mAX_CONTEXT_REDUCTION_DEPTH,
540 thisPackage = mainPackageId,
546 objectSuf = phaseInputExt StopLn,
547 hcSuf = phaseInputExt HCc,
550 outputFile = Nothing,
552 dynLibLoader = Deployable,
553 dumpPrefix = Nothing,
554 dumpPrefixForce = Nothing,
558 cmdlineFrameworks = [],
559 tmpDir = cDEFAULT_TMPDIR,
576 pkgDatabase = Nothing,
577 pkgState = panic "no package state yet: call GHC.setSessionDynFlags",
578 wayNames = panic "defaultDynFlags: No wayNames",
579 buildTag = panic "defaultDynFlags: No buildTag",
580 rtsBuildTag = panic "defaultDynFlags: No rtsBuildTag",
581 -- initSysTools fills all these in
582 ghcUsagePath = panic "defaultDynFlags: No ghciUsagePath",
583 ghciUsagePath = panic "defaultDynFlags: No ghciUsagePath",
584 topDir = panic "defaultDynFlags: No topDir",
585 systemPackageConfig = panic "no systemPackageConfig: call GHC.setSessionDynFlags",
586 pgm_L = panic "defaultDynFlags: No pgm_L",
587 pgm_P = panic "defaultDynFlags: No pgm_P",
588 pgm_F = panic "defaultDynFlags: No pgm_F",
589 pgm_c = panic "defaultDynFlags: No pgm_c",
590 pgm_m = panic "defaultDynFlags: No pgm_m",
591 pgm_s = panic "defaultDynFlags: No pgm_s",
592 pgm_a = panic "defaultDynFlags: No pgm_a",
593 pgm_l = panic "defaultDynFlags: No pgm_l",
594 pgm_dll = panic "defaultDynFlags: No pgm_dll",
595 pgm_T = panic "defaultDynFlags: No pgm_T",
596 pgm_sysman = panic "defaultDynFlags: No pgm_sysman",
597 pgm_windres = panic "defaultDynFlags: No pgm_windres",
598 -- end of initSysTools values
600 depMakefile = "Makefile",
601 depIncludePkgDeps = False,
605 -- end of ghc -M values
606 haddockOptions = Nothing,
608 Opt_AutoLinkPackages,
609 Opt_ReadUserPackageConf,
611 Opt_MonoPatBinds, -- Experimentally, I'm making this non-standard
612 -- behaviour the default, to see if anyone notices
616 Opt_MonomorphismRestriction,
624 Opt_PrintBindContents
626 ++ [f | (ns,f) <- optLevelFlags, 0 `elem` ns]
627 -- The default -O0 options
630 log_action = \severity srcSpan style msg ->
632 SevInfo -> printErrs (msg style)
633 SevFatal -> printErrs (msg style)
636 printErrs ((mkLocMessage srcSpan msg) style)
637 -- careful (#2302): printErrs prints in UTF-8, whereas
638 -- converting to string first and using hPutStr would
639 -- just emit the low 8 bits of each unicode char.
646 0 | print errors & warnings only
647 1 | minimal verbosity: print "compiling M ... done." for each module.
648 2 | equivalent to -dshow-passes
649 3 | equivalent to existing "ghc -v"
650 4 | "ghc -v -ddump-most"
651 5 | "ghc -v -ddump-all"
654 -- | Test whether a 'DynFlag' is set
655 dopt :: DynFlag -> DynFlags -> Bool
656 dopt f dflags = f `elem` (flags dflags)
659 dopt_set :: DynFlags -> DynFlag -> DynFlags
660 dopt_set dfs f = dfs{ flags = f : flags dfs }
662 -- | Unset a 'DynFlag'
663 dopt_unset :: DynFlags -> DynFlag -> DynFlags
664 dopt_unset dfs f = dfs{ flags = filter (/= f) (flags dfs) }
666 -- | Retrieve the options corresponding to a particular @opt_*@ field in the correct order
667 getOpts :: DynFlags -- ^ 'DynFlags' to retrieve the options from
668 -> (DynFlags -> [a]) -- ^ Relevant record accessor: one of the @opt_*@ accessors
669 -> [a] -- ^ Correctly ordered extracted options
670 getOpts dflags opts = reverse (opts dflags)
671 -- We add to the options from the front, so we need to reverse the list
673 -- | Gets the verbosity flag for the current verbosity level. This is fed to
674 -- other tools, so GHC-specific verbosity flags like @-ddump-most@ are not included
675 getVerbFlag :: DynFlags -> String
677 | verbosity dflags >= 3 = "-v"
680 setObjectDir, setHiDir, setStubDir, setObjectSuf, setHiSuf, setHcSuf, parseDynLibLoaderMode,
681 setPgmP, setPgmL, setPgmF, setPgmc, setPgmm, setPgms, setPgma, setPgml, setPgmdll, setPgmwindres,
682 addOptL, addOptP, addOptF, addOptc, addOptm, addOpta, addOptl, addOptwindres,
683 addCmdlineFramework, addHaddockOpts
684 :: String -> DynFlags -> DynFlags
685 setOutputFile, setOutputHi, setDumpPrefixForce
686 :: Maybe String -> DynFlags -> DynFlags
688 setObjectDir f d = d{ objectDir = Just f}
689 setHiDir f d = d{ hiDir = Just f}
690 setStubDir f d = d{ stubDir = Just f, includePaths = f : includePaths d }
691 -- -stubdir D adds an implicit -I D, so that gcc can find the _stub.h file
692 -- \#included from the .hc file when compiling with -fvia-C.
694 setObjectSuf f d = d{ objectSuf = f}
695 setHiSuf f d = d{ hiSuf = f}
696 setHcSuf f d = d{ hcSuf = f}
698 setOutputFile f d = d{ outputFile = f}
699 setOutputHi f d = d{ outputHi = f}
701 parseDynLibLoaderMode f d =
703 ("deploy", "") -> d{ dynLibLoader = Deployable }
704 ("sysdep", "") -> d{ dynLibLoader = SystemDependent }
705 ("wrapped", "") -> d{ dynLibLoader = Wrapped Nothing }
706 ("wrapped:", "hard") -> d{ dynLibLoader = Wrapped Nothing }
707 ("wrapped:", flex) -> d{ dynLibLoader = Wrapped (Just flex) }
708 (_,_) -> error "Unknown dynlib loader"
710 setDumpPrefixForce f d = d { dumpPrefixForce = f}
712 -- XXX HACK: Prelude> words "'does not' work" ===> ["'does","not'","work"]
713 -- Config.hs should really use Option.
714 setPgmP f d = let (pgm:args) = words f in d{ pgm_P = (pgm, map Option args)}
716 setPgmL f d = d{ pgm_L = f}
717 setPgmF f d = d{ pgm_F = f}
718 setPgmc f d = d{ pgm_c = (f,[])}
719 setPgmm f d = d{ pgm_m = (f,[])}
720 setPgms f d = d{ pgm_s = (f,[])}
721 setPgma f d = d{ pgm_a = (f,[])}
722 setPgml f d = d{ pgm_l = (f,[])}
723 setPgmdll f d = d{ pgm_dll = (f,[])}
724 setPgmwindres f d = d{ pgm_windres = f}
726 addOptL f d = d{ opt_L = f : opt_L d}
727 addOptP f d = d{ opt_P = f : opt_P d}
728 addOptF f d = d{ opt_F = f : opt_F d}
729 addOptc f d = d{ opt_c = f : opt_c d}
730 addOptm f d = d{ opt_m = f : opt_m d}
731 addOpta f d = d{ opt_a = f : opt_a d}
732 addOptl f d = d{ opt_l = f : opt_l d}
733 addOptwindres f d = d{ opt_windres = f : opt_windres d}
735 setDepMakefile :: FilePath -> DynFlags -> DynFlags
736 setDepMakefile f d = d { depMakefile = deOptDep f }
738 setDepIncludePkgDeps :: Bool -> DynFlags -> DynFlags
739 setDepIncludePkgDeps b d = d { depIncludePkgDeps = b }
741 addDepExcludeMod :: String -> DynFlags -> DynFlags
743 = d { depExcludeMods = mkModuleName (deOptDep m) : depExcludeMods d }
745 addDepSuffix :: FilePath -> DynFlags -> DynFlags
746 addDepSuffix s d = d { depSuffixes = deOptDep s : depSuffixes d }
748 setDepWarnings :: Bool -> DynFlags -> DynFlags
749 setDepWarnings b d = d { depWarnings = b }
752 -- We used to use "-optdep-flag -optdeparg", so for legacy applications
753 -- we need to strip the "-optdep" off of the arg
754 deOptDep :: String -> String
755 deOptDep x = case maybePrefixMatch "-optdep" x of
759 addCmdlineFramework f d = d{ cmdlineFrameworks = f : cmdlineFrameworks d}
761 addHaddockOpts f d = d{ haddockOptions = Just f}
763 -- -----------------------------------------------------------------------------
764 -- Command-line options
766 -- | When invoking external tools as part of the compilation pipeline, we
767 -- pass these a sequence of options on the command-line. Rather than
768 -- just using a list of Strings, we use a type that allows us to distinguish
769 -- between filepaths and 'other stuff'. The reason for this is that
770 -- this type gives us a handle on transforming filenames, and filenames only,
771 -- to whatever format they're expected to be on a particular platform.
773 = FileOption -- an entry that _contains_ filename(s) / filepaths.
774 String -- a non-filepath prefix that shouldn't be
775 -- transformed (e.g., "/out=")
776 String -- the filepath/filename portion
779 -----------------------------------------------------------------------------
780 -- Setting the optimisation level
782 updOptLevel :: Int -> DynFlags -> DynFlags
783 -- ^ Sets the 'DynFlags' to be appropriate to the optimisation level
785 = dfs2{ optLevel = final_n }
787 final_n = max 0 (min 2 n) -- Clamp to 0 <= n <= 2
788 dfs1 = foldr (flip dopt_unset) dfs remove_dopts
789 dfs2 = foldr (flip dopt_set) dfs1 extra_dopts
791 extra_dopts = [ f | (ns,f) <- optLevelFlags, final_n `elem` ns ]
792 remove_dopts = [ f | (ns,f) <- optLevelFlags, final_n `notElem` ns ]
794 optLevelFlags :: [([Int], DynFlag)]
796 = [ ([0], Opt_IgnoreInterfacePragmas)
797 , ([0], Opt_OmitInterfacePragmas)
799 , ([1,2], Opt_IgnoreAsserts)
800 , ([1,2], Opt_EnableRewriteRules) -- Off for -O0; see Note [Scoping for Builtin rules]
802 , ([1,2], Opt_DoEtaReduction)
803 , ([1,2], Opt_CaseMerge)
804 , ([1,2], Opt_Strictness)
806 , ([1,2], Opt_FullLaziness)
808 , ([2], Opt_LiberateCase)
809 , ([2], Opt_SpecConstr)
811 -- , ([2], Opt_StaticArgumentTransformation)
812 -- Max writes: I think it's probably best not to enable SAT with -O2 for the
813 -- 6.10 release. The version of SAT in HEAD at the moment doesn't incorporate
814 -- several improvements to the heuristics, and I'm concerned that without
815 -- those changes SAT will interfere with some attempts to write "high
816 -- performance Haskell", as we saw in some posts on Haskell-Cafe earlier
817 -- this year. In particular, the version in HEAD lacks the tail call
818 -- criterion, so many things that look like reasonable loops will be
819 -- turned into functions with extra (unneccesary) thunk creation.
821 , ([0,1,2], Opt_DoLambdaEtaExpansion)
822 -- This one is important for a tiresome reason:
823 -- we want to make sure that the bindings for data
824 -- constructors are eta-expanded. This is probably
825 -- a good thing anyway, but it seems fragile.
828 -- -----------------------------------------------------------------------------
829 -- Standard sets of warning options
831 standardWarnings :: [DynFlag]
833 = [ Opt_WarnWarningsDeprecations,
834 Opt_WarnDeprecatedFlags,
835 Opt_WarnUnrecognisedPragmas,
836 Opt_WarnOverlappingPatterns,
837 Opt_WarnMissingFields,
838 Opt_WarnMissingMethods,
839 Opt_WarnDuplicateExports,
840 Opt_WarnDodgyForeignImports
843 minusWOpts :: [DynFlag]
845 = standardWarnings ++
846 [ Opt_WarnUnusedBinds,
847 Opt_WarnUnusedMatches,
848 Opt_WarnUnusedImports,
849 Opt_WarnIncompletePatterns,
853 minusWallOpts :: [DynFlag]
856 [ Opt_WarnTypeDefaults,
857 Opt_WarnNameShadowing,
863 -- minuswRemovesOpts should be every warning option
864 minuswRemovesOpts :: [DynFlag]
867 [Opt_WarnImplicitPrelude,
868 Opt_WarnIncompletePatternsRecUpd,
869 Opt_WarnSimplePatterns,
870 Opt_WarnMonomorphism,
871 Opt_WarnUnrecognisedPragmas,
875 -- -----------------------------------------------------------------------------
876 -- CoreToDo: abstraction of core-to-core passes to run.
878 data CoreToDo -- These are diff core-to-core passes,
879 -- which may be invoked in any order,
880 -- as many times as you like.
882 = CoreDoSimplify -- The core-to-core simplifier.
885 -- Each run of the simplifier can take a different
886 -- set of simplifier-specific flags.
888 | CoreDoFloatOutwards FloatOutSwitches
893 | CoreDoWorkerWrapper
896 | CoreDoOldStrictness
899 | CoreDoRuleCheck Int{-CompilerPhase-} String -- Check for non-application of rules
900 -- matching this string
901 | CoreDoVectorisation PackageId
902 | CoreDoNothing -- Useful when building up
903 | CoreDoPasses [CoreToDo] -- lists of these things
905 data SimplifierMode -- See comments in SimplMonad
907 | SimplPhase Int [String]
909 data SimplifierSwitch
910 = MaxSimplifierIterations Int
913 data FloatOutSwitches
914 = FloatOutSw Bool -- True <=> float lambdas to top level
915 Bool -- True <=> float constants to top level,
916 -- even if they do not escape a lambda
919 -- The core-to-core pass ordering is derived from the DynFlags:
920 runWhen :: Bool -> CoreToDo -> CoreToDo
921 runWhen True do_this = do_this
922 runWhen False _ = CoreDoNothing
924 runMaybe :: Maybe a -> (a -> CoreToDo) -> CoreToDo
925 runMaybe (Just x) f = f x
926 runMaybe Nothing _ = CoreDoNothing
928 getCoreToDo :: DynFlags -> [CoreToDo]
930 | Just todo <- coreToDo dflags = todo -- set explicitly by user
931 | otherwise = core_todo
933 opt_level = optLevel dflags
934 phases = simplPhases dflags
935 max_iter = maxSimplIterations dflags
936 strictness = dopt Opt_Strictness dflags
937 full_laziness = dopt Opt_FullLaziness dflags
938 cse = dopt Opt_CSE dflags
939 spec_constr = dopt Opt_SpecConstr dflags
940 liberate_case = dopt Opt_LiberateCase dflags
941 rule_check = ruleCheck dflags
942 static_args = dopt Opt_StaticArgumentTransformation dflags
944 maybe_rule_check phase = runMaybe rule_check (CoreDoRuleCheck phase)
946 simpl_phase phase names iter
948 [ CoreDoSimplify (SimplPhase phase names) [
949 MaxSimplifierIterations iter
951 maybe_rule_check phase
955 = runWhen (dopt Opt_Vectorise dflags)
956 $ CoreDoPasses [ simpl_gently, CoreDoVectorisation (dphPackage dflags) ]
959 -- By default, we have 2 phases before phase 0.
961 -- Want to run with inline phase 2 after the specialiser to give
962 -- maximum chance for fusion to work before we inline build/augment
963 -- in phase 1. This made a difference in 'ansi' where an
964 -- overloaded function wasn't inlined till too late.
966 -- Need phase 1 so that build/augment get
967 -- inlined. I found that spectral/hartel/genfft lost some useful
968 -- strictness in the function sumcode' if augment is not inlined
969 -- before strictness analysis runs
970 simpl_phases = CoreDoPasses [ simpl_phase phase ["main"] max_iter
971 | phase <- [phases, phases-1 .. 1] ]
974 -- initial simplify: mk specialiser happy: minimum effort please
975 simpl_gently = CoreDoSimplify SimplGently [
977 -- Don't inline anything till full laziness has bitten
978 -- In particular, inlining wrappers inhibits floating
979 -- e.g. ...(case f x of ...)...
980 -- ==> ...(case (case x of I# x# -> fw x#) of ...)...
981 -- ==> ...(case x of I# x# -> case fw x# of ...)...
982 -- and now the redex (f x) isn't floatable any more
983 -- Similarly, don't apply any rules until after full
984 -- laziness. Notably, list fusion can prevent floating.
986 NoCaseOfCase, -- Don't do case-of-case transformations.
987 -- This makes full laziness work better
988 MaxSimplifierIterations max_iter
992 if opt_level == 0 then
994 simpl_phase 0 ["final"] max_iter]
995 else {- opt_level >= 1 -} [
997 -- We want to do the static argument transform before full laziness as it
998 -- may expose extra opportunities to float things outwards. However, to fix
999 -- up the output of the transformation we need at do at least one simplify
1000 -- after this before anything else
1001 runWhen static_args (CoreDoPasses [ simpl_gently, CoreDoStaticArgs ]),
1003 -- We run vectorisation here for now, but we might also try to run
1007 -- initial simplify: mk specialiser happy: minimum effort please
1010 -- Specialisation is best done before full laziness
1011 -- so that overloaded functions have all their dictionary lambdas manifest
1014 runWhen full_laziness (CoreDoFloatOutwards (FloatOutSw False False)),
1020 -- Phase 0: allow all Ids to be inlined now
1021 -- This gets foldr inlined before strictness analysis
1023 -- At least 3 iterations because otherwise we land up with
1024 -- huge dead expressions because of an infelicity in the
1026 -- let k = BIG in foldr k z xs
1027 -- ==> let k = BIG in letrec go = \xs -> ...(k x).... in go xs
1028 -- ==> let k = BIG in letrec go = \xs -> ...(BIG x).... in go xs
1030 simpl_phase 0 ["main"] (max max_iter 3),
1033 #ifdef OLD_STRICTNESS
1034 CoreDoOldStrictness,
1036 runWhen strictness (CoreDoPasses [
1038 CoreDoWorkerWrapper,
1040 simpl_phase 0 ["post-worker-wrapper"] max_iter
1043 runWhen full_laziness
1044 (CoreDoFloatOutwards (FloatOutSw False -- Not lambdas
1045 True)), -- Float constants
1046 -- nofib/spectral/hartel/wang doubles in speed if you
1047 -- do full laziness late in the day. It only happens
1048 -- after fusion and other stuff, so the early pass doesn't
1049 -- catch it. For the record, the redex is
1050 -- f_el22 (f_el21 r_midblock)
1053 runWhen cse CoreCSE,
1054 -- We want CSE to follow the final full-laziness pass, because it may
1055 -- succeed in commoning up things floated out by full laziness.
1056 -- CSE used to rely on the no-shadowing invariant, but it doesn't any more
1062 -- Case-liberation for -O2. This should be after
1063 -- strictness analysis and the simplification which follows it.
1064 runWhen liberate_case (CoreDoPasses [
1066 simpl_phase 0 ["post-liberate-case"] max_iter
1067 ]), -- Run the simplifier after LiberateCase to vastly
1068 -- reduce the possiblility of shadowing
1069 -- Reason: see Note [Shadowing] in SpecConstr.lhs
1071 runWhen spec_constr CoreDoSpecConstr,
1075 -- Final clean-up simplification:
1076 simpl_phase 0 ["final"] max_iter
1079 -- -----------------------------------------------------------------------------
1080 -- StgToDo: abstraction of stg-to-stg passes to run.
1083 = StgDoMassageForProfiling -- should be (next to) last
1084 -- There's also setStgVarInfo, but its absolute "lastness"
1085 -- is so critical that it is hardwired in (no flag).
1088 getStgToDo :: DynFlags -> [StgToDo]
1090 | Just todo <- stgToDo dflags = todo -- set explicitly by user
1093 stg_stats = dopt Opt_StgStats dflags
1095 todo1 = if stg_stats then [D_stg_stats] else []
1097 todo2 | WayProf `elem` wayNames dflags
1098 = StgDoMassageForProfiling : todo1
1102 -- -----------------------------------------------------------------------------
1105 allFlags :: [String]
1106 allFlags = map ('-':) $
1107 [ flagName flag | flag <- dynamic_flags, ok (flagOptKind flag) ] ++
1108 map ("fno-"++) flags ++
1109 map ("f"++) flags ++
1110 map ("X"++) supportedLanguages ++
1111 map ("XNo"++) supportedLanguages
1112 where ok (PrefixPred _ _) = False
1114 flags = [ name | (name, _, _) <- fFlags ]
1116 dynamic_flags :: [Flag DynP]
1118 Flag "n" (NoArg (setDynFlag Opt_DryRun)) Supported
1119 , Flag "cpp" (NoArg (setDynFlag Opt_Cpp)) Supported
1120 , Flag "F" (NoArg (setDynFlag Opt_Pp)) Supported
1121 , Flag "#include" (HasArg (addCmdlineHCInclude)) Supported
1122 , Flag "v" (OptIntSuffix setVerbosity) Supported
1124 ------- Specific phases --------------------------------------------
1125 , Flag "pgmL" (HasArg (upd . setPgmL)) Supported
1126 , Flag "pgmP" (HasArg (upd . setPgmP)) Supported
1127 , Flag "pgmF" (HasArg (upd . setPgmF)) Supported
1128 , Flag "pgmc" (HasArg (upd . setPgmc)) Supported
1129 , Flag "pgmm" (HasArg (upd . setPgmm)) Supported
1130 , Flag "pgms" (HasArg (upd . setPgms)) Supported
1131 , Flag "pgma" (HasArg (upd . setPgma)) Supported
1132 , Flag "pgml" (HasArg (upd . setPgml)) Supported
1133 , Flag "pgmdll" (HasArg (upd . setPgmdll)) Supported
1134 , Flag "pgmwindres" (HasArg (upd . setPgmwindres)) Supported
1136 , Flag "optL" (HasArg (upd . addOptL)) Supported
1137 , Flag "optP" (HasArg (upd . addOptP)) Supported
1138 , Flag "optF" (HasArg (upd . addOptF)) Supported
1139 , Flag "optc" (HasArg (upd . addOptc)) Supported
1140 , Flag "optm" (HasArg (upd . addOptm)) Supported
1141 , Flag "opta" (HasArg (upd . addOpta)) Supported
1142 , Flag "optl" (HasArg (upd . addOptl)) Supported
1143 , Flag "optwindres" (HasArg (upd . addOptwindres)) Supported
1146 (NoArg (if can_split then setDynFlag Opt_SplitObjs else return ()))
1149 -------- ghc -M -----------------------------------------------------
1150 , Flag "dep-suffix" (HasArg (upd . addDepSuffix)) Supported
1151 , Flag "optdep-s" (HasArg (upd . addDepSuffix))
1152 (Deprecated "Use -dep-suffix instead")
1153 , Flag "dep-makefile" (HasArg (upd . setDepMakefile)) Supported
1154 , Flag "optdep-f" (HasArg (upd . setDepMakefile))
1155 (Deprecated "Use -dep-makefile instead")
1156 , Flag "optdep-w" (NoArg (upd (setDepWarnings False)))
1157 (Deprecated "-optdep-w doesn't do anything")
1158 , Flag "include-pkg-deps" (NoArg (upd (setDepIncludePkgDeps True))) Supported
1159 , Flag "optdep--include-prelude" (NoArg (upd (setDepIncludePkgDeps True)))
1160 (Deprecated "Use -include-pkg-deps instead")
1161 , Flag "optdep--include-pkg-deps" (NoArg (upd (setDepIncludePkgDeps True)))
1162 (Deprecated "Use -include-pkg-deps instead")
1163 , Flag "exclude-module" (HasArg (upd . addDepExcludeMod)) Supported
1164 , Flag "optdep--exclude-module" (HasArg (upd . addDepExcludeMod))
1165 (Deprecated "Use -exclude-module instead")
1166 , Flag "optdep-x" (HasArg (upd . addDepExcludeMod))
1167 (Deprecated "Use -exclude-module instead")
1169 -------- Linking ----------------------------------------------------
1170 , Flag "c" (NoArg (upd $ \d -> d{ ghcLink=NoLink } ))
1172 , Flag "no-link" (NoArg (upd $ \d -> d{ ghcLink=NoLink } ))
1173 (Deprecated "Use -c instead")
1174 , Flag "shared" (NoArg (upd $ \d -> d{ ghcLink=LinkDynLib } ))
1176 , Flag "dynload" (HasArg (upd . parseDynLibLoaderMode))
1179 ------- Libraries ---------------------------------------------------
1180 , Flag "L" (Prefix addLibraryPath ) Supported
1181 , Flag "l" (AnySuffix (\s -> do upd (addOptl s))) Supported
1183 ------- Frameworks --------------------------------------------------
1184 -- -framework-path should really be -F ...
1185 , Flag "framework-path" (HasArg addFrameworkPath ) Supported
1186 , Flag "framework" (HasArg (upd . addCmdlineFramework)) Supported
1188 ------- Output Redirection ------------------------------------------
1189 , Flag "odir" (HasArg (upd . setObjectDir)) Supported
1190 , Flag "o" (SepArg (upd . setOutputFile . Just)) Supported
1191 , Flag "ohi" (HasArg (upd . setOutputHi . Just )) Supported
1192 , Flag "osuf" (HasArg (upd . setObjectSuf)) Supported
1193 , Flag "hcsuf" (HasArg (upd . setHcSuf)) Supported
1194 , Flag "hisuf" (HasArg (upd . setHiSuf)) Supported
1195 , Flag "hidir" (HasArg (upd . setHiDir)) Supported
1196 , Flag "tmpdir" (HasArg (upd . setTmpDir)) Supported
1197 , Flag "stubdir" (HasArg (upd . setStubDir)) Supported
1198 , Flag "ddump-file-prefix" (HasArg (upd . setDumpPrefixForce . Just))
1201 ------- Keeping temporary files -------------------------------------
1202 -- These can be singular (think ghc -c) or plural (think ghc --make)
1203 , Flag "keep-hc-file" (NoArg (setDynFlag Opt_KeepHcFiles)) Supported
1204 , Flag "keep-hc-files" (NoArg (setDynFlag Opt_KeepHcFiles)) Supported
1205 , Flag "keep-s-file" (NoArg (setDynFlag Opt_KeepSFiles)) Supported
1206 , Flag "keep-s-files" (NoArg (setDynFlag Opt_KeepSFiles)) Supported
1207 , Flag "keep-raw-s-file" (NoArg (setDynFlag Opt_KeepRawSFiles)) Supported
1208 , Flag "keep-raw-s-files" (NoArg (setDynFlag Opt_KeepRawSFiles)) Supported
1209 -- This only makes sense as plural
1210 , Flag "keep-tmp-files" (NoArg (setDynFlag Opt_KeepTmpFiles)) Supported
1212 ------- Miscellaneous ----------------------------------------------
1213 , Flag "no-auto-link-packages" (NoArg (unSetDynFlag Opt_AutoLinkPackages)) Supported
1214 , Flag "no-hs-main" (NoArg (setDynFlag Opt_NoHsMain)) Supported
1215 , Flag "main-is" (SepArg setMainIs ) Supported
1216 , Flag "haddock" (NoArg (setDynFlag Opt_Haddock)) Supported
1217 , Flag "haddock-opts" (HasArg (upd . addHaddockOpts)) Supported
1218 , Flag "hpcdir" (SepArg setOptHpcDir) Supported
1220 ------- recompilation checker --------------------------------------
1221 , Flag "recomp" (NoArg (unSetDynFlag Opt_ForceRecomp))
1222 (Deprecated "Use -fno-force-recomp instead")
1223 , Flag "no-recomp" (NoArg (setDynFlag Opt_ForceRecomp))
1224 (Deprecated "Use -fforce-recomp instead")
1226 ------- Packages ----------------------------------------------------
1227 , Flag "package-conf" (HasArg extraPkgConf_) Supported
1228 , Flag "no-user-package-conf" (NoArg (unSetDynFlag Opt_ReadUserPackageConf))
1230 , Flag "package-name" (HasArg (upd . setPackageName)) Supported
1231 , Flag "package" (HasArg exposePackage) Supported
1232 , Flag "hide-package" (HasArg hidePackage) Supported
1233 , Flag "hide-all-packages" (NoArg (setDynFlag Opt_HideAllPackages))
1235 , Flag "ignore-package" (HasArg ignorePackage)
1237 , Flag "syslib" (HasArg exposePackage)
1238 (Deprecated "Use -package instead")
1240 ------ HsCpp opts ---------------------------------------------------
1241 , Flag "D" (AnySuffix (upd . addOptP)) Supported
1242 , Flag "U" (AnySuffix (upd . addOptP)) Supported
1244 ------- Include/Import Paths ----------------------------------------
1245 , Flag "I" (Prefix addIncludePath) Supported
1246 , Flag "i" (OptPrefix addImportPath ) Supported
1248 ------ Debugging ----------------------------------------------------
1249 , Flag "dstg-stats" (NoArg (setDynFlag Opt_StgStats)) Supported
1251 , Flag "ddump-cmm" (setDumpFlag Opt_D_dump_cmm)
1253 , Flag "ddump-cmmz" (setDumpFlag Opt_D_dump_cmmz)
1255 , Flag "ddump-cmmz-pretty" (setDumpFlag Opt_D_dump_cmmz_pretty)
1257 , Flag "ddump-cps-cmm" (setDumpFlag Opt_D_dump_cps_cmm)
1259 , Flag "ddump-cvt-cmm" (setDumpFlag Opt_D_dump_cvt_cmm)
1261 , Flag "ddump-asm" (setDumpFlag Opt_D_dump_asm)
1263 , Flag "ddump-asm-native" (setDumpFlag Opt_D_dump_asm_native)
1265 , Flag "ddump-asm-liveness" (setDumpFlag Opt_D_dump_asm_liveness)
1267 , Flag "ddump-asm-coalesce" (setDumpFlag Opt_D_dump_asm_coalesce)
1269 , Flag "ddump-asm-regalloc" (setDumpFlag Opt_D_dump_asm_regalloc)
1271 , Flag "ddump-asm-conflicts" (setDumpFlag Opt_D_dump_asm_conflicts)
1273 , Flag "ddump-asm-regalloc-stages"
1274 (setDumpFlag Opt_D_dump_asm_regalloc_stages)
1276 , Flag "ddump-asm-stats" (setDumpFlag Opt_D_dump_asm_stats)
1278 , Flag "ddump-cpranal" (setDumpFlag Opt_D_dump_cpranal)
1280 , Flag "ddump-deriv" (setDumpFlag Opt_D_dump_deriv)
1282 , Flag "ddump-ds" (setDumpFlag Opt_D_dump_ds)
1284 , Flag "ddump-flatC" (setDumpFlag Opt_D_dump_flatC)
1286 , Flag "ddump-foreign" (setDumpFlag Opt_D_dump_foreign)
1288 , Flag "ddump-inlinings" (setDumpFlag Opt_D_dump_inlinings)
1290 , Flag "ddump-rule-firings" (setDumpFlag Opt_D_dump_rule_firings)
1292 , Flag "ddump-occur-anal" (setDumpFlag Opt_D_dump_occur_anal)
1294 , Flag "ddump-parsed" (setDumpFlag Opt_D_dump_parsed)
1296 , Flag "ddump-rn" (setDumpFlag Opt_D_dump_rn)
1298 , Flag "ddump-simpl" (setDumpFlag Opt_D_dump_simpl)
1300 , Flag "ddump-simpl-iterations" (setDumpFlag Opt_D_dump_simpl_iterations)
1302 , Flag "ddump-simpl-phases" (OptPrefix setDumpSimplPhases)
1304 , Flag "ddump-spec" (setDumpFlag Opt_D_dump_spec)
1306 , Flag "ddump-prep" (setDumpFlag Opt_D_dump_prep)
1308 , Flag "ddump-stg" (setDumpFlag Opt_D_dump_stg)
1310 , Flag "ddump-stranal" (setDumpFlag Opt_D_dump_stranal)
1312 , Flag "ddump-tc" (setDumpFlag Opt_D_dump_tc)
1314 , Flag "ddump-types" (setDumpFlag Opt_D_dump_types)
1316 , Flag "ddump-rules" (setDumpFlag Opt_D_dump_rules)
1318 , Flag "ddump-cse" (setDumpFlag Opt_D_dump_cse)
1320 , Flag "ddump-worker-wrapper" (setDumpFlag Opt_D_dump_worker_wrapper)
1322 , Flag "ddump-rn-trace" (setDumpFlag Opt_D_dump_rn_trace)
1324 , Flag "ddump-if-trace" (setDumpFlag Opt_D_dump_if_trace)
1326 , Flag "ddump-tc-trace" (setDumpFlag Opt_D_dump_tc_trace)
1328 , Flag "ddump-splices" (setDumpFlag Opt_D_dump_splices)
1330 , Flag "ddump-rn-stats" (setDumpFlag Opt_D_dump_rn_stats)
1332 , Flag "ddump-opt-cmm" (setDumpFlag Opt_D_dump_opt_cmm)
1334 , Flag "ddump-simpl-stats" (setDumpFlag Opt_D_dump_simpl_stats)
1336 , Flag "ddump-bcos" (setDumpFlag Opt_D_dump_BCOs)
1338 , Flag "dsource-stats" (setDumpFlag Opt_D_source_stats)
1340 , Flag "dverbose-core2core" (NoArg setVerboseCore2Core)
1342 , Flag "dverbose-stg2stg" (setDumpFlag Opt_D_verbose_stg2stg)
1344 , Flag "ddump-hi" (setDumpFlag Opt_D_dump_hi)
1346 , Flag "ddump-minimal-imports" (setDumpFlag Opt_D_dump_minimal_imports)
1348 , Flag "ddump-vect" (setDumpFlag Opt_D_dump_vect)
1350 , Flag "ddump-hpc" (setDumpFlag Opt_D_dump_hpc)
1352 , Flag "ddump-mod-cycles" (setDumpFlag Opt_D_dump_mod_cycles)
1354 , Flag "ddump-view-pattern-commoning" (setDumpFlag Opt_D_dump_view_pattern_commoning)
1356 , Flag "ddump-to-file" (setDumpFlag Opt_DumpToFile)
1358 , Flag "ddump-hi-diffs" (setDumpFlag Opt_D_dump_hi_diffs)
1361 , Flag "dcore-lint" (NoArg (setDynFlag Opt_DoCoreLinting))
1363 , Flag "dstg-lint" (NoArg (setDynFlag Opt_DoStgLinting))
1365 , Flag "dcmm-lint" (NoArg (setDynFlag Opt_DoCmmLinting))
1367 , Flag "dasm-lint" (NoArg (setDynFlag Opt_DoAsmLinting))
1369 , Flag "dshow-passes"
1370 (NoArg (do forceRecompile
1371 setVerbosity (Just 2)))
1373 , Flag "dfaststring-stats" (NoArg (setDynFlag Opt_D_faststring_stats))
1376 ------ Machine dependant (-m<blah>) stuff ---------------------------
1378 , Flag "monly-2-regs" (NoArg (upd (\s -> s{stolen_x86_regs = 2}) ))
1380 , Flag "monly-3-regs" (NoArg (upd (\s -> s{stolen_x86_regs = 3}) ))
1382 , Flag "monly-4-regs" (NoArg (upd (\s -> s{stolen_x86_regs = 4}) ))
1385 ------ Warning opts -------------------------------------------------
1386 , Flag "W" (NoArg (mapM_ setDynFlag minusWOpts))
1388 , Flag "Werror" (NoArg (setDynFlag Opt_WarnIsError))
1390 , Flag "Wwarn" (NoArg (unSetDynFlag Opt_WarnIsError))
1392 , Flag "Wall" (NoArg (mapM_ setDynFlag minusWallOpts))
1394 , Flag "Wnot" (NoArg (mapM_ unSetDynFlag minusWallOpts))
1395 (Deprecated "Use -w instead")
1396 , Flag "w" (NoArg (mapM_ unSetDynFlag minuswRemovesOpts))
1399 ------ Optimisation flags ------------------------------------------
1400 , Flag "O" (NoArg (upd (setOptLevel 1))) Supported
1401 , Flag "Onot" (NoArg (upd (setOptLevel 0)))
1402 (Deprecated "Use -O0 instead")
1403 , Flag "Odph" (NoArg (upd setDPHOpt)) Supported
1404 , Flag "O" (OptIntSuffix (\mb_n -> upd (setOptLevel (mb_n `orElse` 1))))
1406 -- If the number is missing, use 1
1408 , Flag "fsimplifier-phases"
1409 (IntSuffix (\n -> upd (\dfs -> dfs{ simplPhases = n })))
1411 , Flag "fmax-simplifier-iterations"
1412 (IntSuffix (\n -> upd (\dfs -> dfs{ maxSimplIterations = n })))
1415 , Flag "fspec-constr-threshold"
1416 (IntSuffix (\n -> upd (\dfs -> dfs{ specConstrThreshold = Just n })))
1418 , Flag "fno-spec-constr-threshold"
1419 (NoArg (upd (\dfs -> dfs{ specConstrThreshold = Nothing })))
1421 , Flag "fspec-constr-count"
1422 (IntSuffix (\n -> upd (\dfs -> dfs{ specConstrCount = Just n })))
1424 , Flag "fno-spec-constr-count"
1425 (NoArg (upd (\dfs -> dfs{ specConstrCount = Nothing })))
1427 , Flag "fliberate-case-threshold"
1428 (IntSuffix (\n -> upd (\dfs -> dfs{ liberateCaseThreshold = Just n })))
1430 , Flag "fno-liberate-case-threshold"
1431 (NoArg (upd (\dfs -> dfs{ liberateCaseThreshold = Nothing })))
1434 , Flag "frule-check"
1435 (SepArg (\s -> upd (\dfs -> dfs{ ruleCheck = Just s })))
1437 , Flag "fcontext-stack"
1438 (IntSuffix $ \n -> upd $ \dfs -> dfs{ ctxtStkDepth = n })
1441 ------ DPH flags ----------------------------------------------------
1444 (NoArg (setDPHBackend DPHSeq))
1447 (NoArg (setDPHBackend DPHPar))
1450 (NoArg (setDPHBackend DPHThis))
1453 ------ Compiler flags -----------------------------------------------
1455 , Flag "fasm" (NoArg (setObjTarget HscAsm)) Supported
1456 , Flag "fvia-c" (NoArg (setObjTarget HscC)) Supported
1457 , Flag "fvia-C" (NoArg (setObjTarget HscC)) Supported
1459 , Flag "fno-code" (NoArg (setTarget HscNothing)) Supported
1460 , Flag "fbyte-code" (NoArg (setTarget HscInterpreted)) Supported
1461 , Flag "fobject-code" (NoArg (setTarget defaultHscTarget)) Supported
1463 , Flag "fglasgow-exts" (NoArg (mapM_ setDynFlag glasgowExtsFlags))
1465 , Flag "fno-glasgow-exts" (NoArg (mapM_ unSetDynFlag glasgowExtsFlags))
1468 ++ map (mkFlag True "f" setDynFlag ) fFlags
1469 ++ map (mkFlag False "fno-" unSetDynFlag) fFlags
1470 ++ map (mkFlag True "X" setDynFlag ) xFlags
1471 ++ map (mkFlag False "XNo" unSetDynFlag) xFlags
1473 mkFlag :: Bool -- ^ True <=> it should be turned on
1474 -> String -- ^ The flag prefix
1475 -> (DynFlag -> DynP ())
1476 -> (String, DynFlag, Bool -> Deprecated)
1478 mkFlag turnOn flagPrefix f (name, dynflag, deprecated)
1479 = Flag (flagPrefix ++ name) (NoArg (f dynflag)) (deprecated turnOn)
1481 deprecatedForLanguage :: String -> Bool -> Deprecated
1482 deprecatedForLanguage lang turn_on
1483 = Deprecated ("use -X" ++ flag ++ " or pragma {-# LANGUAGE " ++ flag ++ "#-} instead")
1485 flag | turn_on = lang
1486 | otherwise = "No"++lang
1488 useInstead :: String -> Bool -> Deprecated
1489 useInstead flag turn_on
1490 = Deprecated ("Use -f" ++ no ++ flag ++ " instead")
1492 no = if turn_on then "" else "no-"
1494 -- | These @-f\<blah\>@ flags can all be reversed with @-fno-\<blah\>@
1495 fFlags :: [(String, DynFlag, Bool -> Deprecated)]
1497 ( "warn-dodgy-foreign-imports", Opt_WarnDodgyForeignImports, const Supported ),
1498 ( "warn-dodgy-imports", Opt_WarnDodgyImports, const Supported ),
1499 ( "warn-duplicate-exports", Opt_WarnDuplicateExports, const Supported ),
1500 ( "warn-hi-shadowing", Opt_WarnHiShadows, const Supported ),
1501 ( "warn-implicit-prelude", Opt_WarnImplicitPrelude, const Supported ),
1502 ( "warn-incomplete-patterns", Opt_WarnIncompletePatterns, const Supported ),
1503 ( "warn-incomplete-record-updates", Opt_WarnIncompletePatternsRecUpd, const Supported ),
1504 ( "warn-missing-fields", Opt_WarnMissingFields, const Supported ),
1505 ( "warn-missing-methods", Opt_WarnMissingMethods, const Supported ),
1506 ( "warn-missing-signatures", Opt_WarnMissingSigs, const Supported ),
1507 ( "warn-name-shadowing", Opt_WarnNameShadowing, const Supported ),
1508 ( "warn-overlapping-patterns", Opt_WarnOverlappingPatterns, const Supported ),
1509 ( "warn-simple-patterns", Opt_WarnSimplePatterns, const Supported ),
1510 ( "warn-type-defaults", Opt_WarnTypeDefaults, const Supported ),
1511 ( "warn-monomorphism-restriction", Opt_WarnMonomorphism, const Supported ),
1512 ( "warn-unused-binds", Opt_WarnUnusedBinds, const Supported ),
1513 ( "warn-unused-imports", Opt_WarnUnusedImports, const Supported ),
1514 ( "warn-unused-matches", Opt_WarnUnusedMatches, const Supported ),
1515 ( "warn-warnings-deprecations", Opt_WarnWarningsDeprecations, const Supported ),
1516 ( "warn-deprecations", Opt_WarnWarningsDeprecations, const Supported ),
1517 ( "warn-deprecated-flags", Opt_WarnDeprecatedFlags, const Supported ),
1518 ( "warn-orphans", Opt_WarnOrphans, const Supported ),
1519 ( "warn-tabs", Opt_WarnTabs, const Supported ),
1520 ( "warn-unrecognised-pragmas", Opt_WarnUnrecognisedPragmas, const Supported ),
1521 ( "print-explicit-foralls", Opt_PrintExplicitForalls, const Supported ),
1522 ( "strictness", Opt_Strictness, const Supported ),
1523 ( "static-argument-transformation", Opt_StaticArgumentTransformation, const Supported ),
1524 ( "full-laziness", Opt_FullLaziness, const Supported ),
1525 ( "liberate-case", Opt_LiberateCase, const Supported ),
1526 ( "spec-constr", Opt_SpecConstr, const Supported ),
1527 ( "cse", Opt_CSE, const Supported ),
1528 ( "ignore-interface-pragmas", Opt_IgnoreInterfacePragmas, const Supported ),
1529 ( "omit-interface-pragmas", Opt_OmitInterfacePragmas, const Supported ),
1530 ( "do-lambda-eta-expansion", Opt_DoLambdaEtaExpansion, const Supported ),
1531 ( "ignore-asserts", Opt_IgnoreAsserts, const Supported ),
1532 ( "do-eta-reduction", Opt_DoEtaReduction, const Supported ),
1533 ( "case-merge", Opt_CaseMerge, const Supported ),
1534 ( "unbox-strict-fields", Opt_UnboxStrictFields, const Supported ),
1535 ( "method-sharing", Opt_MethodSharing, const Supported ),
1536 ( "dicts-cheap", Opt_DictsCheap, const Supported ),
1537 ( "excess-precision", Opt_ExcessPrecision, const Supported ),
1538 ( "asm-mangling", Opt_DoAsmMangling, const Supported ),
1539 ( "print-bind-result", Opt_PrintBindResult, const Supported ),
1540 ( "force-recomp", Opt_ForceRecomp, const Supported ),
1541 ( "hpc-no-auto", Opt_Hpc_No_Auto, const Supported ),
1542 ( "rewrite-rules", Opt_EnableRewriteRules, useInstead "enable-rewrite-rules" ),
1543 ( "enable-rewrite-rules", Opt_EnableRewriteRules, const Supported ),
1544 ( "break-on-exception", Opt_BreakOnException, const Supported ),
1545 ( "break-on-error", Opt_BreakOnError, const Supported ),
1546 ( "print-evld-with-show", Opt_PrintEvldWithShow, const Supported ),
1547 ( "print-bind-contents", Opt_PrintBindContents, const Supported ),
1548 ( "run-cps", Opt_RunCPSZ, const Supported ),
1549 ( "convert-to-zipper-and-back", Opt_ConvertToZipCfgAndBack, const Supported ),
1550 ( "vectorise", Opt_Vectorise, const Supported ),
1551 ( "regs-graph", Opt_RegsGraph, const Supported ),
1552 ( "regs-iterative", Opt_RegsIterative, const Supported ),
1553 ( "th", Opt_TemplateHaskell,
1554 deprecatedForLanguage "TemplateHaskell" ),
1555 ( "fi", Opt_ForeignFunctionInterface,
1556 deprecatedForLanguage "ForeignFunctionInterface" ),
1557 ( "ffi", Opt_ForeignFunctionInterface,
1558 deprecatedForLanguage "ForeignFunctionInterface" ),
1559 ( "arrows", Opt_Arrows,
1560 deprecatedForLanguage "Arrows" ),
1561 ( "generics", Opt_Generics,
1562 deprecatedForLanguage "Generics" ),
1563 ( "implicit-prelude", Opt_ImplicitPrelude,
1564 deprecatedForLanguage "ImplicitPrelude" ),
1565 ( "bang-patterns", Opt_BangPatterns,
1566 deprecatedForLanguage "BangPatterns" ),
1567 ( "monomorphism-restriction", Opt_MonomorphismRestriction,
1568 deprecatedForLanguage "MonomorphismRestriction" ),
1569 ( "mono-pat-binds", Opt_MonoPatBinds,
1570 deprecatedForLanguage "MonoPatBinds" ),
1571 ( "extended-default-rules", Opt_ExtendedDefaultRules,
1572 deprecatedForLanguage "ExtendedDefaultRules" ),
1573 ( "implicit-params", Opt_ImplicitParams,
1574 deprecatedForLanguage "ImplicitParams" ),
1575 ( "scoped-type-variables", Opt_ScopedTypeVariables,
1576 deprecatedForLanguage "ScopedTypeVariables" ),
1578 deprecatedForLanguage "PArr" ),
1579 ( "allow-overlapping-instances", Opt_OverlappingInstances,
1580 deprecatedForLanguage "OverlappingInstances" ),
1581 ( "allow-undecidable-instances", Opt_UndecidableInstances,
1582 deprecatedForLanguage "UndecidableInstances" ),
1583 ( "allow-incoherent-instances", Opt_IncoherentInstances,
1584 deprecatedForLanguage "IncoherentInstances" ),
1585 ( "gen-manifest", Opt_GenManifest, const Supported ),
1586 ( "embed-manifest", Opt_EmbedManifest, const Supported ),
1587 ( "implicit-import-qualified", Opt_ImplicitImportQualified, const Supported )
1590 supportedLanguages :: [String]
1591 supportedLanguages = [ name | (name, _, _) <- xFlags ]
1593 -- This may contain duplicates
1594 languageOptions :: [DynFlag]
1595 languageOptions = [ dynFlag | (_, dynFlag, _) <- xFlags ]
1597 -- | These -X<blah> flags can all be reversed with -XNo<blah>
1598 xFlags :: [(String, DynFlag, Bool -> Deprecated)]
1600 ( "CPP", Opt_Cpp, const Supported ),
1601 ( "PostfixOperators", Opt_PostfixOperators, const Supported ),
1602 ( "PatternGuards", Opt_PatternGuards, const Supported ),
1603 ( "UnicodeSyntax", Opt_UnicodeSyntax, const Supported ),
1604 ( "MagicHash", Opt_MagicHash, const Supported ),
1605 ( "PolymorphicComponents", Opt_PolymorphicComponents, const Supported ),
1606 ( "ExistentialQuantification", Opt_ExistentialQuantification, const Supported ),
1607 ( "KindSignatures", Opt_KindSignatures, const Supported ),
1608 ( "EmptyDataDecls", Opt_EmptyDataDecls, const Supported ),
1609 ( "ParallelListComp", Opt_ParallelListComp, const Supported ),
1610 ( "TransformListComp", Opt_TransformListComp, const Supported ),
1611 ( "ForeignFunctionInterface", Opt_ForeignFunctionInterface, const Supported ),
1612 ( "UnliftedFFITypes", Opt_UnliftedFFITypes, const Supported ),
1613 ( "LiberalTypeSynonyms", Opt_LiberalTypeSynonyms, const Supported ),
1614 ( "Rank2Types", Opt_Rank2Types, const Supported ),
1615 ( "RankNTypes", Opt_RankNTypes, const Supported ),
1616 ( "ImpredicativeTypes", Opt_ImpredicativeTypes, const Supported ),
1617 ( "TypeOperators", Opt_TypeOperators, const Supported ),
1618 ( "RecursiveDo", Opt_RecursiveDo, const Supported ),
1619 ( "Arrows", Opt_Arrows, const Supported ),
1620 ( "PArr", Opt_PArr, const Supported ),
1621 ( "TemplateHaskell", Opt_TemplateHaskell, const Supported ),
1622 ( "QuasiQuotes", Opt_QuasiQuotes, const Supported ),
1623 ( "Generics", Opt_Generics, const Supported ),
1625 ( "ImplicitPrelude", Opt_ImplicitPrelude, const Supported ),
1626 ( "RecordWildCards", Opt_RecordWildCards, const Supported ),
1627 ( "NamedFieldPuns", Opt_RecordPuns, const Supported ),
1628 ( "RecordPuns", Opt_RecordPuns,
1629 deprecatedForLanguage "NamedFieldPuns" ),
1630 ( "DisambiguateRecordFields", Opt_DisambiguateRecordFields, const Supported ),
1631 ( "OverloadedStrings", Opt_OverloadedStrings, const Supported ),
1632 ( "GADTs", Opt_GADTs, const Supported ),
1633 ( "ViewPatterns", Opt_ViewPatterns, const Supported ),
1634 ( "TypeFamilies", Opt_TypeFamilies, const Supported ),
1635 ( "BangPatterns", Opt_BangPatterns, const Supported ),
1637 ( "MonomorphismRestriction", Opt_MonomorphismRestriction, const Supported ),
1638 -- On by default (which is not strictly H98):
1639 ( "MonoPatBinds", Opt_MonoPatBinds, const Supported ),
1640 ( "RelaxedPolyRec", Opt_RelaxedPolyRec, const Supported ),
1641 ( "ExtendedDefaultRules", Opt_ExtendedDefaultRules, const Supported ),
1642 ( "ImplicitParams", Opt_ImplicitParams, const Supported ),
1643 ( "ScopedTypeVariables", Opt_ScopedTypeVariables, const Supported ),
1645 ( "PatternSignatures", Opt_ScopedTypeVariables,
1646 deprecatedForLanguage "ScopedTypeVariables" ),
1648 ( "UnboxedTuples", Opt_UnboxedTuples, const Supported ),
1649 ( "StandaloneDeriving", Opt_StandaloneDeriving, const Supported ),
1650 ( "DeriveDataTypeable", Opt_DeriveDataTypeable, const Supported ),
1651 ( "TypeSynonymInstances", Opt_TypeSynonymInstances, const Supported ),
1652 ( "FlexibleContexts", Opt_FlexibleContexts, const Supported ),
1653 ( "FlexibleInstances", Opt_FlexibleInstances, const Supported ),
1654 ( "ConstrainedClassMethods", Opt_ConstrainedClassMethods, const Supported ),
1655 ( "MultiParamTypeClasses", Opt_MultiParamTypeClasses, const Supported ),
1656 ( "FunctionalDependencies", Opt_FunctionalDependencies, const Supported ),
1657 ( "GeneralizedNewtypeDeriving", Opt_GeneralizedNewtypeDeriving, const Supported ),
1658 ( "OverlappingInstances", Opt_OverlappingInstances, const Supported ),
1659 ( "UndecidableInstances", Opt_UndecidableInstances, const Supported ),
1660 ( "IncoherentInstances", Opt_IncoherentInstances, const Supported ),
1661 ( "PackageImports", Opt_PackageImports, const Supported )
1664 impliedFlags :: [(DynFlag, DynFlag)]
1666 = [ (Opt_GADTs, Opt_RelaxedPolyRec) -- We want type-sig variables to
1667 -- be completely rigid for GADTs
1669 , (Opt_ScopedTypeVariables, Opt_RelaxedPolyRec) -- Ditto for scoped type variables; see
1670 -- Note [Scoped tyvars] in TcBinds
1673 glasgowExtsFlags :: [DynFlag]
1674 glasgowExtsFlags = [
1675 Opt_PrintExplicitForalls
1676 , Opt_ForeignFunctionInterface
1677 , Opt_UnliftedFFITypes
1679 , Opt_ImplicitParams
1680 , Opt_ScopedTypeVariables
1682 , Opt_TypeSynonymInstances
1683 , Opt_StandaloneDeriving
1684 , Opt_DeriveDataTypeable
1685 , Opt_FlexibleContexts
1686 , Opt_FlexibleInstances
1687 , Opt_ConstrainedClassMethods
1688 , Opt_MultiParamTypeClasses
1689 , Opt_FunctionalDependencies
1691 , Opt_PolymorphicComponents
1692 , Opt_ExistentialQuantification
1694 , Opt_PostfixOperators
1696 , Opt_LiberalTypeSynonyms
1698 , Opt_ImpredicativeTypes
1701 , Opt_ParallelListComp
1702 , Opt_EmptyDataDecls
1703 , Opt_KindSignatures
1704 , Opt_GeneralizedNewtypeDeriving
1705 , Opt_TypeFamilies ]
1707 -- -----------------------------------------------------------------------------
1708 -- Parsing the dynamic flags.
1710 -- | Parse dynamic flags from a list of command line argument. Returns the
1711 -- the parsed 'DynFlags', the left-over arguments, and a list of warnings.
1712 -- Throws a 'UsageError' if errors occurred during parsing (such as unknown
1713 -- flags or missing arguments).
1714 parseDynamicFlags :: Monad m =>
1715 DynFlags -> [Located String]
1716 -> m (DynFlags, [Located String], [Located String])
1717 -- ^ Updated 'DynFlags', left-over arguments, and
1718 -- list of warnings.
1719 parseDynamicFlags dflags args = do
1720 -- XXX Legacy support code
1721 -- We used to accept things like
1722 -- optdep-f -optdepdepend
1723 -- optdep-f -optdep depend
1724 -- optdep -f -optdepdepend
1725 -- optdep -f -optdep depend
1726 -- but the spaces trip up proper argument handling. So get rid of them.
1727 let f (L p "-optdep" : L _ x : xs) = (L p ("-optdep" ++ x)) : f xs
1728 f (x : xs) = x : f xs
1731 let ((leftover, errs, warns), dflags')
1732 = runCmdLine (processArgs dynamic_flags args') dflags
1733 when (not (null errs)) $ ghcError $ errorsToGhcException errs
1734 return (dflags', leftover, warns)
1736 type DynP = CmdLineP DynFlags
1738 upd :: (DynFlags -> DynFlags) -> DynP ()
1740 dfs <- getCmdLineState
1741 putCmdLineState $! (f dfs)
1743 --------------------------
1744 setDynFlag, unSetDynFlag :: DynFlag -> DynP ()
1745 setDynFlag f = do { upd (\dfs -> dopt_set dfs f)
1746 ; mapM_ setDynFlag deps }
1748 deps = [ d | (f', d) <- impliedFlags, f' == f ]
1749 -- When you set f, set the ones it implies
1750 -- NB: use setDynFlag recursively, in case the implied flags
1751 -- implies further flags
1752 -- When you un-set f, however, we don't un-set the things it implies
1753 -- (except for -fno-glasgow-exts, which is treated specially)
1755 unSetDynFlag f = upd (\dfs -> dopt_unset dfs f)
1757 --------------------------
1758 setDumpFlag :: DynFlag -> OptKind DynP
1759 setDumpFlag dump_flag
1760 = NoArg (setDynFlag dump_flag >> when want_recomp forceRecompile)
1762 -- Certain dumpy-things are really interested in what's going
1763 -- on during recompilation checking, so in those cases we
1764 -- don't want to turn it off.
1765 want_recomp = dump_flag `notElem` [Opt_D_dump_if_trace,
1766 Opt_D_dump_hi_diffs]
1768 forceRecompile :: DynP ()
1769 -- Whenver we -ddump, force recompilation (by switching off the
1770 -- recompilation checker), else you don't see the dump! However,
1771 -- don't switch it off in --make mode, else *everything* gets
1772 -- recompiled which probably isn't what you want
1773 forceRecompile = do { dfs <- getCmdLineState
1774 ; when (force_recomp dfs) (setDynFlag Opt_ForceRecomp) }
1776 force_recomp dfs = isOneShot (ghcMode dfs)
1778 setVerboseCore2Core :: DynP ()
1779 setVerboseCore2Core = do setDynFlag Opt_D_verbose_core2core
1781 upd (\s -> s { shouldDumpSimplPhase = const True })
1783 setDumpSimplPhases :: String -> DynP ()
1784 setDumpSimplPhases s = do forceRecompile
1785 upd (\s -> s { shouldDumpSimplPhase = spec })
1787 spec :: SimplifierMode -> Bool
1789 . map (join (&&) . map match . split ':')
1795 join :: (Bool -> Bool -> Bool)
1796 -> [SimplifierMode -> Bool]
1797 -> SimplifierMode -> Bool
1798 join _ [] = const True
1799 join op ss = foldr1 (\f g x -> f x `op` g x) ss
1801 match :: String -> SimplifierMode -> Bool
1802 match "" = const True
1803 match s = case reads s of
1804 [(n,"")] -> phase_num n
1807 phase_num :: Int -> SimplifierMode -> Bool
1808 phase_num n (SimplPhase k _) = n == k
1809 phase_num _ _ = False
1811 phase_name :: String -> SimplifierMode -> Bool
1812 phase_name s SimplGently = s == "gentle"
1813 phase_name s (SimplPhase _ ss) = s `elem` ss
1815 setVerbosity :: Maybe Int -> DynP ()
1816 setVerbosity mb_n = upd (\dfs -> dfs{ verbosity = mb_n `orElse` 3 })
1818 addCmdlineHCInclude :: String -> DynP ()
1819 addCmdlineHCInclude a = upd (\s -> s{cmdlineHcIncludes = a : cmdlineHcIncludes s})
1821 extraPkgConf_ :: FilePath -> DynP ()
1822 extraPkgConf_ p = upd (\s -> s{ extraPkgConfs = p : extraPkgConfs s })
1824 exposePackage, hidePackage, ignorePackage :: String -> DynP ()
1826 upd (\s -> s{ packageFlags = ExposePackage p : packageFlags s })
1828 upd (\s -> s{ packageFlags = HidePackage p : packageFlags s })
1830 upd (\s -> s{ packageFlags = IgnorePackage p : packageFlags s })
1832 setPackageName :: String -> DynFlags -> DynFlags
1834 | Nothing <- unpackPackageId pid
1835 = ghcError (CmdLineError ("cannot parse \'" ++ p ++ "\' as a package identifier"))
1837 = \s -> s{ thisPackage = pid }
1839 pid = stringToPackageId p
1841 -- If we're linking a binary, then only targets that produce object
1842 -- code are allowed (requests for other target types are ignored).
1843 setTarget :: HscTarget -> DynP ()
1844 setTarget l = upd set
1847 | ghcLink dfs /= LinkBinary || isObjectTarget l = dfs{ hscTarget = l }
1850 -- Changes the target only if we're compiling object code. This is
1851 -- used by -fasm and -fvia-C, which switch from one to the other, but
1852 -- not from bytecode to object-code. The idea is that -fasm/-fvia-C
1853 -- can be safely used in an OPTIONS_GHC pragma.
1854 setObjTarget :: HscTarget -> DynP ()
1855 setObjTarget l = upd set
1858 | isObjectTarget (hscTarget dfs) = dfs { hscTarget = l }
1861 setOptLevel :: Int -> DynFlags -> DynFlags
1862 setOptLevel n dflags
1863 | hscTarget dflags == HscInterpreted && n > 0
1865 -- not in IO any more, oh well:
1866 -- putStr "warning: -O conflicts with --interactive; -O ignored.\n"
1868 = updOptLevel n dflags
1871 -- -Odph is equivalent to
1873 -- -O2 optimise as much as possible
1874 -- -fno-method-sharing sharing specialisation defeats fusion
1876 -- -fdicts-cheap always inline dictionaries
1877 -- -fmax-simplifier-iterations20 this is necessary sometimes
1878 -- -fno-spec-constr-threshold run SpecConstr even for big loops
1879 -- -fno-spec-constr-count SpecConstr as much as possible
1881 setDPHOpt :: DynFlags -> DynFlags
1882 setDPHOpt dflags = setOptLevel 2 (dflags { maxSimplIterations = 20
1883 , specConstrThreshold = Nothing
1884 , specConstrCount = Nothing
1886 `dopt_set` Opt_DictsCheap
1887 `dopt_unset` Opt_MethodSharing
1889 data DPHBackend = DPHPar
1892 deriving(Eq, Ord, Enum, Show)
1894 setDPHBackend :: DPHBackend -> DynP ()
1895 setDPHBackend backend
1897 upd $ \dflags -> dflags { dphBackend = backend }
1898 mapM_ exposePackage (dph_packages backend)
1900 dph_packages DPHThis = []
1901 dph_packages DPHPar = ["dph-prim-par", "dph-par"]
1902 dph_packages DPHSeq = ["dph-prim-seq", "dph-seq"]
1904 dphPackage :: DynFlags -> PackageId
1905 dphPackage dflags = case dphBackend dflags of
1906 DPHPar -> dphParPackageId
1907 DPHSeq -> dphSeqPackageId
1908 DPHThis -> thisPackage dflags
1910 setMainIs :: String -> DynP ()
1912 | not (null main_fn) && isLower (head main_fn)
1913 -- The arg looked like "Foo.Bar.baz"
1914 = upd $ \d -> d{ mainFunIs = Just main_fn,
1915 mainModIs = mkModule mainPackageId (mkModuleName main_mod) }
1917 | isUpper (head arg) -- The arg looked like "Foo" or "Foo.Bar"
1918 = upd $ \d -> d{ mainModIs = mkModule mainPackageId (mkModuleName arg) }
1920 | otherwise -- The arg looked like "baz"
1921 = upd $ \d -> d{ mainFunIs = Just arg }
1923 (main_mod, main_fn) = splitLongestPrefix arg (== '.')
1925 -- | Get the unqualified name of the function to use as the \"main\" for the main module.
1926 -- Either returns the default name or the one configured on the command line with -main-is
1927 getMainFun :: DynFlags -> RdrName
1928 getMainFun dflags = case (mainFunIs dflags) of
1929 Just fn -> mkRdrUnqual (mkVarOccFS (mkFastString fn))
1930 Nothing -> main_RDR_Unqual
1932 -----------------------------------------------------------------------------
1933 -- Paths & Libraries
1935 addImportPath, addLibraryPath, addIncludePath, addFrameworkPath :: FilePath -> DynP ()
1937 -- -i on its own deletes the import paths
1938 addImportPath "" = upd (\s -> s{importPaths = []})
1939 addImportPath p = upd (\s -> s{importPaths = importPaths s ++ splitPathList p})
1943 upd (\s -> s{libraryPaths = libraryPaths s ++ splitPathList p})
1946 upd (\s -> s{includePaths = includePaths s ++ splitPathList p})
1948 addFrameworkPath p =
1949 upd (\s -> s{frameworkPaths = frameworkPaths s ++ splitPathList p})
1951 #ifndef mingw32_TARGET_OS
1952 split_marker :: Char
1953 split_marker = ':' -- not configurable (ToDo)
1956 splitPathList :: String -> [String]
1957 splitPathList s = filter notNull (splitUp s)
1958 -- empty paths are ignored: there might be a trailing
1959 -- ':' in the initial list, for example. Empty paths can
1960 -- cause confusion when they are translated into -I options
1961 -- for passing to gcc.
1963 #ifndef mingw32_TARGET_OS
1964 splitUp xs = split split_marker xs
1966 -- Windows: 'hybrid' support for DOS-style paths in directory lists.
1968 -- That is, if "foo:bar:baz" is used, this interpreted as
1969 -- consisting of three entries, 'foo', 'bar', 'baz'.
1970 -- However, with "c:/foo:c:\\foo;x:/bar", this is interpreted
1971 -- as 3 elts, "c:/foo", "c:\\foo", "x:/bar"
1973 -- Notice that no attempt is made to fully replace the 'standard'
1974 -- split marker ':' with the Windows / DOS one, ';'. The reason being
1975 -- that this will cause too much breakage for users & ':' will
1976 -- work fine even with DOS paths, if you're not insisting on being silly.
1979 splitUp (x:':':div:xs) | div `elem` dir_markers
1980 = ((x:':':div:p): splitUp rs)
1982 (p,rs) = findNextPath xs
1983 -- we used to check for existence of the path here, but that
1984 -- required the IO monad to be threaded through the command-line
1985 -- parser which is quite inconvenient. The
1986 splitUp xs = cons p (splitUp rs)
1988 (p,rs) = findNextPath xs
1993 -- will be called either when we've consumed nought or the
1994 -- "<Drive>:/" part of a DOS path, so splitting is just a Q of
1995 -- finding the next split marker.
1997 case break (`elem` split_markers) xs of
1998 (p, _:ds) -> (p, ds)
2001 split_markers :: [Char]
2002 split_markers = [':', ';']
2004 dir_markers :: [Char]
2005 dir_markers = ['/', '\\']
2008 -- -----------------------------------------------------------------------------
2009 -- tmpDir, where we store temporary files.
2011 setTmpDir :: FilePath -> DynFlags -> DynFlags
2012 setTmpDir dir dflags = dflags{ tmpDir = normalise dir }
2013 -- we used to fix /cygdrive/c/.. on Windows, but this doesn't
2014 -- seem necessary now --SDM 7/2/2008
2016 -----------------------------------------------------------------------------
2019 setOptHpcDir :: String -> DynP ()
2020 setOptHpcDir arg = upd $ \ d -> d{hpcDir = arg}
2022 -----------------------------------------------------------------------------
2023 -- Via-C compilation stuff
2025 -- There are some options that we need to pass to gcc when compiling
2026 -- Haskell code via C, but are only supported by recent versions of
2027 -- gcc. The configure script decides which of these options we need,
2028 -- and puts them in the file "extra-gcc-opts" in $topdir, which is
2029 -- read before each via-C compilation. The advantage of having these
2030 -- in a separate file is that the file can be created at install-time
2031 -- depending on the available gcc version, and even re-generated later
2032 -- if gcc is upgraded.
2034 -- The options below are not dependent on the version of gcc, only the
2037 machdepCCOpts :: DynFlags -> ([String], -- flags for all C compilations
2038 [String]) -- for registerised HC compilations
2039 machdepCCOpts _dflags
2040 #if alpha_TARGET_ARCH
2042 #ifdef HAVE_THREADED_RTS_SUPPORT
2046 -- For now, to suppress the gcc warning "call-clobbered
2047 -- register used for global register variable", we simply
2048 -- disable all warnings altogether using the -w flag. Oh well.
2050 #elif hppa_TARGET_ARCH
2051 -- ___HPUX_SOURCE, not _HPUX_SOURCE, is #defined if -ansi!
2052 -- (very nice, but too bad the HP /usr/include files don't agree.)
2053 = ( ["-D_HPUX_SOURCE"], [] )
2055 #elif m68k_TARGET_ARCH
2056 -- -fno-defer-pop : for the .hc files, we want all the pushing/
2057 -- popping of args to routines to be explicit; if we let things
2058 -- be deferred 'til after an STGJUMP, imminent death is certain!
2060 -- -fomit-frame-pointer : *don't*
2061 -- It's better to have a6 completely tied up being a frame pointer
2062 -- rather than let GCC pick random things to do with it.
2063 -- (If we want to steal a6, then we would try to do things
2064 -- as on iX86, where we *do* steal the frame pointer [%ebp].)
2065 = ( [], ["-fno-defer-pop", "-fno-omit-frame-pointer"] )
2067 #elif i386_TARGET_ARCH
2068 -- -fno-defer-pop : basically the same game as for m68k
2070 -- -fomit-frame-pointer : *must* in .hc files; because we're stealing
2071 -- the fp (%ebp) for our register maps.
2072 = let n_regs = stolen_x86_regs _dflags
2075 ( [ if sta then "-DDONT_WANT_WIN32_DLL_SUPPORT" else ""
2078 "-fomit-frame-pointer",
2079 -- we want -fno-builtin, because when gcc inlines
2080 -- built-in functions like memcpy() it tends to
2081 -- run out of registers, requiring -monly-n-regs
2083 "-DSTOLEN_X86_REGS="++show n_regs ]
2086 #elif ia64_TARGET_ARCH
2087 = ( [], ["-fomit-frame-pointer", "-G0"] )
2089 #elif x86_64_TARGET_ARCH
2090 = ( [], ["-fomit-frame-pointer",
2091 "-fno-asynchronous-unwind-tables",
2092 -- the unwind tables are unnecessary for HC code,
2093 -- and get in the way of -split-objs. Another option
2094 -- would be to throw them away in the mangler, but this
2097 -- calling builtins like strlen() using the FFI can
2098 -- cause gcc to run out of regs, so use the external
2102 #elif sparc_TARGET_ARCH
2104 -- For now, to suppress the gcc warning "call-clobbered
2105 -- register used for global register variable", we simply
2106 -- disable all warnings altogether using the -w flag. Oh well.
2108 #elif powerpc_apple_darwin_TARGET
2110 -- Disable Apple's precompiling preprocessor. It's a great thing
2111 -- for "normal" programs, but it doesn't support register variable
2113 = ( [], ["-no-cpp-precomp"] )
2118 picCCOpts :: DynFlags -> [String]
2120 #if darwin_TARGET_OS
2121 -- Apple prefers to do things the other way round.
2122 -- PIC is on by default.
2123 -- -mdynamic-no-pic:
2124 -- Turn off PIC code generation.
2126 -- Don't generate "common" symbols - these are unwanted
2127 -- in dynamic libraries.
2130 = ["-fno-common", "-D__PIC__"]
2132 = ["-mdynamic-no-pic"]
2133 #elif mingw32_TARGET_OS
2134 -- no -fPIC for Windows
2141 = ["-fPIC", "-D__PIC__"]
2146 -- -----------------------------------------------------------------------------
2150 can_split = cSplitObjs == "YES"
2152 -- -----------------------------------------------------------------------------
2155 compilerInfo :: [(String, String)]
2156 compilerInfo = [("Project name", cProjectName),
2157 ("Project version", cProjectVersion),
2158 ("Booter version", cBooterVersion),
2160 ("Interface file version", cHscIfaceFileVersion),
2161 ("Have interpreter", cGhcWithInterpreter),
2162 ("Object splitting", cSplitObjs),
2163 ("Have native code generator", cGhcWithNativeCodeGen),
2164 ("Support SMP", cGhcWithSMP),
2165 ("Unregisterised", cGhcUnregisterised),
2166 ("Tables next to code", cGhcEnableTablesNextToCode),
2167 ("Win32 DLLs", cEnableWin32DLLs),
2168 ("RTS ways", cGhcRTSWays),
2169 ("Leading underscore", cLeadingUnderscore),
2170 ("Debug on", show debugIsOn)