2 % (c) The AQUA Project, Glasgow University, 1996-98
4 \section[CmdLineOpts]{Things to do with command-line options}
30 opt_D_dump_occur_anal,
36 opt_D_dump_simpl_iterations,
37 opt_D_dump_simpl_stats,
44 opt_D_dump_worker_wrapper,
49 opt_D_dump_minimal_imports,
51 opt_D_verbose_core2core,
52 opt_D_verbose_stg2stg,
61 opt_WarnDuplicateExports,
63 opt_WarnIncompletePatterns,
64 opt_WarnMissingFields,
65 opt_WarnMissingMethods,
67 opt_WarnNameShadowing,
68 opt_WarnOverlappingPatterns,
69 opt_WarnSimplePatterns,
72 opt_WarnUnusedImports,
73 opt_WarnUnusedMatches,
77 opt_AutoSccsOnAllToplevs,
78 opt_AutoSccsOnExportedToplevs,
79 opt_AutoSccsOnIndividualCafs,
87 opt_MaxContextReductionDepth,
88 opt_AllowOverlappingInstances,
89 opt_AllowUndecidableInstances,
91 opt_IrrefutableTuples,
100 opt_LiberateCaseThreshold,
101 opt_StgDoLetNoEscapes,
104 opt_UnboxStrictFields,
105 opt_SimplNoPreInlining,
106 opt_SimplDoEtaReduction,
107 opt_SimplDoLambdaEtaExpansion,
110 opt_SimplPedanticBottoms,
111 opt_SimplExcessPrecision,
114 opt_UF_HiFileThreshold,
115 opt_UF_CreationThreshold,
117 opt_UF_FunAppDiscount,
118 opt_UF_KeenessFactor,
119 opt_UF_UpdateInPlace,
125 opt_EmitCExternDecls,
126 opt_EnsureSplittableC,
133 opt_IgnoreIfacePragmas,
135 opt_NoImplicitPrelude,
137 opt_OmitInterfacePragmas,
138 opt_ProduceExportCStubs,
139 opt_ProduceExportHStubs,
161 #include "HsVersions.h"
163 import Array ( array, (//) )
166 import Constants -- Default values for some flags
168 import FastString ( headFS )
169 import Maybes ( assocMaybe, firstJust, maybeToBool )
170 import Panic ( panic, panic# )
172 #if __GLASGOW_HASKELL__ < 301
173 import ArrBase ( Array(..) )
175 import PrelArr ( Array(..) )
179 A command-line {\em switch} is (generally) either on or off; e.g., the
180 ``verbose'' (-v) switch is either on or off.
182 A list of {\em ToDo}s is things to be done in a particular part of
183 processing. A (fictitious) example for the Core-to-Core simplifier
184 might be: run the simplifier, then run the strictness analyser, then
185 run the simplifier again (three ``todos'').
187 There are three ``to-do processing centers'' at the moment. In the
188 main loop (\tr{main/Main.lhs}), in the Core-to-Core processing loop
189 (\tr{simplCore/SimplCore.lhs), and in the STG-to-STG processing loop
190 (\tr{simplStg/SimplStg.lhs}).
193 %************************************************************************
195 \subsection{Datatypes associated with command-line options}
197 %************************************************************************
201 = SwBool Bool -- on/off
202 | SwString FAST_STRING -- nothing or a String
203 | SwInt Int -- nothing or an Int
207 data CoreToDo -- These are diff core-to-core passes,
208 -- which may be invoked in any order,
209 -- as many times as you like.
211 = CoreDoSimplify -- The core-to-core simplifier.
212 (SimplifierSwitch -> SwitchResult)
213 -- Each run of the simplifier can take a different
214 -- set of simplifier-specific flags.
216 | CoreDoFloatOutwards Bool -- True <=> float lambdas to top level
221 | CoreDoWorkerWrapper
233 | StgDoMassageForProfiling -- should be (next to) last
234 -- There's also setStgVarInfo, but its absolute "lastness"
235 -- is so critical that it is hardwired in (no flag).
240 data SimplifierSwitch
241 = MaxSimplifierIterations Int
242 | SimplInlinePhase Int
248 %************************************************************************
250 \subsection{Classifying command-line options}
252 %************************************************************************
255 lookUp :: FAST_STRING -> Bool
256 lookup_int :: String -> Maybe Int
257 lookup_def_int :: String -> Int -> Int
258 lookup_def_float :: String -> Float -> Float
259 lookup_str :: String -> Maybe String
261 lookUp sw = maybeToBool (assoc_opts sw)
263 lookup_str sw = firstJust (map (startsWith sw) unpacked_opts)
265 lookup_int sw = case (lookup_str sw) of
267 Just xx -> Just (read xx)
269 lookup_def_int sw def = case (lookup_str sw) of
270 Nothing -> def -- Use default
273 lookup_def_char sw def = case (lookup_str sw) of
275 _ -> def -- Use default
277 lookup_def_float sw def = case (lookup_str sw) of
278 Nothing -> def -- Use default
281 assoc_opts = assocMaybe [ (a, True) | a <- argv ]
282 unpacked_opts = map _UNPK_ argv
285 Putting the compiler options into temporary at-files
286 may turn out to be necessary later on if we turn hsc into
287 a pure Win32 application where I think there's a command-line
288 length limit of 255. unpacked_opts understands the @ option.
290 assoc_opts = assocMaybe [ (_PK_ a, True) | a <- unpacked_opts ]
292 unpacked_opts :: [String]
298 expandAts ('@':fname) = words (unsafePerformIO (readFile fname))
304 src_filename :: FAST_STRING
305 src_filename = case argv of
306 filename : rest | headFS filename /= '-' -> filename
307 otherwise -> panic "no filename"
312 opt_D_dump_all {- do not -} = lookUp SLIT("-ddump-all")
313 opt_D_dump_most {- export -} = opt_D_dump_all || lookUp SLIT("-ddump-most")
315 opt_D_dump_absC = opt_D_dump_all || lookUp SLIT("-ddump-absC")
316 opt_D_dump_asm = opt_D_dump_all || lookUp SLIT("-ddump-asm")
317 opt_D_dump_cpranal = opt_D_dump_most || lookUp SLIT("-ddump-cpranal")
318 opt_D_dump_deriv = opt_D_dump_most || lookUp SLIT("-ddump-deriv")
319 opt_D_dump_ds = opt_D_dump_most || lookUp SLIT("-ddump-ds")
320 opt_D_dump_flatC = opt_D_dump_all || lookUp SLIT("-ddump-flatC")
321 opt_D_dump_foreign = opt_D_dump_most || lookUp SLIT("-ddump-foreign-stubs")
322 opt_D_dump_inlinings = opt_D_dump_all || lookUp SLIT("-ddump-inlinings")
323 opt_D_dump_occur_anal = opt_D_dump_all || lookUp SLIT("-ddump-occur-anal")
324 opt_D_dump_parsed = opt_D_dump_most || lookUp SLIT("-ddump-parsed")
325 opt_D_dump_realC = opt_D_dump_all || lookUp SLIT("-ddump-realC")
326 opt_D_dump_rn = opt_D_dump_most || lookUp SLIT("-ddump-rn")
327 opt_D_dump_simpl = opt_D_dump_most || lookUp SLIT("-ddump-simpl")
328 opt_D_dump_simpl_iterations = opt_D_dump_all || lookUp SLIT("-ddump-simpl-iterations")
329 opt_D_dump_spec = opt_D_dump_most || lookUp SLIT("-ddump-spec")
330 opt_D_dump_stg = opt_D_dump_most || lookUp SLIT("-ddump-stg")
331 opt_D_dump_stranal = opt_D_dump_most || lookUp SLIT("-ddump-stranal")
332 opt_D_dump_tc = opt_D_dump_most || lookUp SLIT("-ddump-tc")
333 opt_D_dump_types = opt_D_dump_most || lookUp SLIT("-ddump-types")
334 opt_D_dump_rules = opt_D_dump_most || lookUp SLIT("-ddump-rules")
335 opt_D_dump_usagesp = opt_D_dump_most || lookUp SLIT("-ddump-usagesp")
336 opt_D_dump_cse = opt_D_dump_most || lookUp SLIT("-ddump-cse")
337 opt_D_dump_worker_wrapper = opt_D_dump_most || lookUp SLIT("-ddump-workwrap")
338 opt_D_show_passes = opt_D_dump_most || lookUp SLIT("-dshow-passes")
339 opt_D_dump_rn_trace = opt_D_dump_all || lookUp SLIT("-ddump-rn-trace")
340 opt_D_dump_rn_stats = opt_D_dump_most || lookUp SLIT("-ddump-rn-stats")
341 opt_D_dump_stix = opt_D_dump_all || lookUp SLIT("-ddump-stix")
342 opt_D_dump_simpl_stats = opt_D_dump_most || lookUp SLIT("-ddump-simpl-stats")
343 opt_D_source_stats = opt_D_dump_most || lookUp SLIT("-dsource-stats")
344 opt_D_verbose_core2core = opt_D_dump_all || lookUp SLIT("-dverbose-simpl")
345 opt_D_verbose_stg2stg = opt_D_dump_all || lookUp SLIT("-dverbose-stg")
346 opt_D_dump_hi_diffs = opt_D_dump_all || lookUp SLIT("-ddump-hi-diffs")
348 opt_D_dump_minimal_imports = lookUp SLIT("-ddump-minimal-imports")
350 opt_DoCoreLinting = lookUp SLIT("-dcore-lint")
351 opt_DoStgLinting = lookUp SLIT("-dstg-lint")
352 opt_DoUSPLinting = lookUp SLIT("-dusagesp-lint")
353 opt_PprStyle_NoPrags = lookUp SLIT("-dppr-noprags")
354 opt_PprStyle_Debug = lookUp SLIT("-dppr-debug")
355 opt_PprUserLength = lookup_def_int "-dppr-user-length" 5 --ToDo: give this a name
358 opt_WarnDuplicateExports = lookUp SLIT("-fwarn-duplicate-exports")
359 opt_WarnHiShadows = lookUp SLIT("-fwarn-hi-shadowing")
360 opt_WarnIncompletePatterns = lookUp SLIT("-fwarn-incomplete-patterns")
361 opt_WarnMissingFields = lookUp SLIT("-fwarn-missing-fields")
362 opt_WarnMissingMethods = lookUp SLIT("-fwarn-missing-methods")
363 opt_WarnMissingSigs = lookUp SLIT("-fwarn-missing-signatures")
364 opt_WarnNameShadowing = lookUp SLIT("-fwarn-name-shadowing")
365 opt_WarnOverlappingPatterns = lookUp SLIT("-fwarn-overlapping-patterns")
366 opt_WarnSimplePatterns = lookUp SLIT("-fwarn-simple-patterns")
367 opt_WarnTypeDefaults = lookUp SLIT("-fwarn-type-defaults")
368 opt_WarnUnusedBinds = lookUp SLIT("-fwarn-unused-binds")
369 opt_WarnUnusedImports = lookUp SLIT("-fwarn-unused-imports")
370 opt_WarnUnusedMatches = lookUp SLIT("-fwarn-unused-matches")
371 opt_WarnDeprecations = lookUp SLIT("-fwarn-deprecations")
374 opt_AutoSccsOnAllToplevs = lookUp SLIT("-fauto-sccs-on-all-toplevs")
375 opt_AutoSccsOnExportedToplevs = lookUp SLIT("-fauto-sccs-on-exported-toplevs")
376 opt_AutoSccsOnIndividualCafs = lookUp SLIT("-fauto-sccs-on-individual-cafs")
377 opt_AutoSccsOnDicts = lookUp SLIT("-fauto-sccs-on-dicts")
378 opt_SccProfilingOn = lookUp SLIT("-fscc-profiling")
379 opt_DoTickyProfiling = lookUp SLIT("-fticky-ticky")
382 opt_AllStrict = lookUp SLIT("-fall-strict")
383 opt_DictsStrict = lookUp SLIT("-fdicts-strict")
384 opt_AllowOverlappingInstances = lookUp SLIT("-fallow-overlapping-instances")
385 opt_AllowUndecidableInstances = lookUp SLIT("-fallow-undecidable-instances")
386 opt_GlasgowExts = lookUp SLIT("-fglasgow-exts")
387 opt_IrrefutableTuples = lookUp SLIT("-firrefutable-tuples")
388 opt_MaxContextReductionDepth = lookup_def_int "-fcontext-stack" mAX_CONTEXT_REDUCTION_DEPTH
389 opt_NumbersStrict = lookUp SLIT("-fnumbers-strict")
390 opt_Parallel = lookUp SLIT("-fparallel")
391 opt_SMP = lookUp SLIT("-fsmp")
394 opt_DoEtaReduction = lookUp SLIT("-fdo-eta-reduction")
395 opt_DoSemiTagging = lookUp SLIT("-fsemi-tagging")
396 opt_FoldrBuildOn = lookUp SLIT("-ffoldr-build-on")
397 opt_LiberateCaseThreshold = lookup_def_int "-fliberate-case-threshold" (10::Int)
398 opt_StgDoLetNoEscapes = lookUp SLIT("-flet-no-escape")
399 opt_UnfoldCasms = lookUp SLIT("-funfold-casms-in-hi-file")
400 opt_UsageSPOn = lookUp SLIT("-fusagesp-on")
401 opt_UnboxStrictFields = lookUp SLIT("-funbox-strict-fields")
404 The optional '-inpackage=P' flag tells what package
405 we are compiling this module for.
406 The Prelude, for example is compiled with '-package prelude'
408 opt_InPackage = case lookup_str "-inpackage=" of
410 Nothing -> SLIT("Main") -- The package name if none is specified
412 opt_EmitCExternDecls = lookUp SLIT("-femit-extern-decls")
413 opt_EnsureSplittableC = lookUp SLIT("-fglobalise-toplev-names")
414 opt_GranMacros = lookUp SLIT("-fgransim")
415 opt_HiMap = lookup_str "-himap=" -- file saying where to look for .hi files
416 opt_HiMapSep = lookup_def_char "-himap-sep=" ':'
417 opt_HiVersion = lookup_def_int "-fhi-version=" 0 -- what version we're compiling.
418 opt_HistorySize = lookup_def_int "-fhistory-size" 20
419 opt_IgnoreAsserts = lookUp SLIT("-fignore-asserts")
420 opt_IgnoreIfacePragmas = lookUp SLIT("-fignore-interface-pragmas")
421 opt_NoHiCheck = lookUp SLIT("-fno-hi-version-check")
422 opt_NoImplicitPrelude = lookUp SLIT("-fno-implicit-prelude")
423 opt_OmitBlackHoling = lookUp SLIT("-dno-black-holing")
424 opt_OmitInterfacePragmas = lookUp SLIT("-fomit-interface-pragmas")
425 opt_ProduceExportCStubs = lookup_str "-F="
426 opt_ProduceExportHStubs = lookup_str "-FH="
428 -- where to generate the .hi file
429 opt_HiFile = lookup_str "-hifile="
430 opt_HiDir = lookup_str "-hidir="
431 opt_HiSuf = lookup_str "-hisuf="
433 -- Language for output: "C", "asm", "java", maybe more
434 -- Nothing => don't output anything
435 opt_OutputLanguage :: Maybe String
436 opt_OutputLanguage = lookup_str "-olang="
438 opt_OutputFile :: String
439 opt_OutputFile = case lookup_str "-ofile=" of
440 Nothing -> panic "No output file specified (-ofile=xxx)"
443 -- Simplifier switches
444 opt_SimplNoPreInlining = lookUp SLIT("-fno-pre-inlining")
445 -- NoPreInlining is there just to see how bad things
446 -- get if you don't do it!
447 opt_SimplDoEtaReduction = lookUp SLIT("-fdo-eta-reduction")
448 opt_SimplDoLambdaEtaExpansion = lookUp SLIT("-fdo-lambda-eta-expansion")
449 opt_SimplCaseOfCase = lookUp SLIT("-fcase-of-case")
450 opt_SimplCaseMerge = lookUp SLIT("-fcase-merge")
451 opt_SimplPedanticBottoms = lookUp SLIT("-fpedantic-bottoms")
452 opt_SimplExcessPrecision = lookUp SLIT("-fexcess-precision")
455 opt_UF_HiFileThreshold = lookup_def_int "-funfolding-interface-threshold" (45::Int)
456 opt_UF_CreationThreshold = lookup_def_int "-funfolding-creation-threshold" (45::Int)
457 opt_UF_UseThreshold = lookup_def_int "-funfolding-use-threshold" (8::Int) -- Discounts can be big
458 opt_UF_FunAppDiscount = lookup_def_int "-funfolding-fun-discount" (6::Int) -- It's great to inline a fn
459 opt_UF_KeenessFactor = lookup_def_float "-funfolding-keeness-factor" (1.5::Float)
460 opt_UF_UpdateInPlace = lookUp SLIT("-funfolding-update-in-place")
462 opt_UF_CheapOp = ( 1 :: Int) -- Only one instruction; and the args are charged for
463 opt_UF_DearOp = ( 4 :: Int)
465 opt_ReportCompile = lookUp SLIT("-freport-compile")
466 opt_NoPruneDecls = lookUp SLIT("-fno-prune-decls")
467 opt_NoPruneTyDecls = lookUp SLIT("-fno-prune-tydecls")
468 opt_SourceUnchanged = lookUp SLIT("-fsource-unchanged")
469 opt_Static = lookUp SLIT("-static")
470 opt_Unregisterised = lookUp SLIT("-funregisterised")
471 opt_Verbose = lookUp SLIT("-v")
473 opt_UseVanillaRegs | opt_Unregisterised = 0
474 | otherwise = mAX_Real_Vanilla_REG
475 opt_UseFloatRegs | opt_Unregisterised = 0
476 | otherwise = mAX_Real_Float_REG
477 opt_UseDoubleRegs | opt_Unregisterised = 0
478 | otherwise = mAX_Real_Double_REG
479 opt_UseLongRegs | opt_Unregisterised = 0
480 | otherwise = mAX_Real_Long_REG
484 classifyOpts :: ([CoreToDo], -- Core-to-Core processing spec
485 [StgToDo]) -- STG-to-STG processing spec
487 classifyOpts = sep argv [] [] -- accumulators...
489 sep :: [FAST_STRING] -- cmd-line opts (input)
490 -> [CoreToDo] -> [StgToDo] -- to_do accumulators
491 -> ([CoreToDo], [StgToDo]) -- result
493 sep [] core_td stg_td -- all done!
494 = (reverse core_td, reverse stg_td)
496 # define CORE_TD(to_do) sep opts (to_do:core_td) stg_td
497 # define STG_TD(to_do) sep opts core_td (to_do:stg_td)
499 sep (opt1:opts) core_td stg_td
500 = case (_UNPK_ opt1) of -- the non-"just match a string" options are at the end...
501 ',' : _ -> sep opts core_td stg_td -- it is for the parser
503 "-fsimplify" -> -- gather up SimplifierSwitches specially...
504 simpl_sep opts defaultSimplSwitches core_td stg_td
506 "-ffloat-inwards" -> CORE_TD(CoreDoFloatInwards)
507 "-ffloat-outwards" -> CORE_TD(CoreDoFloatOutwards False)
508 "-ffloat-outwards-full" -> CORE_TD(CoreDoFloatOutwards True)
509 "-fliberate-case" -> CORE_TD(CoreLiberateCase)
510 "-fcse" -> CORE_TD(CoreCSE)
511 "-fglom-binds" -> CORE_TD(CoreDoGlomBinds)
512 "-fprint-core" -> CORE_TD(CoreDoPrintCore)
513 "-fstatic-args" -> CORE_TD(CoreDoStaticArgs)
514 "-fstrictness" -> CORE_TD(CoreDoStrictness)
515 "-fworker-wrapper" -> CORE_TD(CoreDoWorkerWrapper)
516 "-fspecialise" -> CORE_TD(CoreDoSpecialising)
517 "-fusagesp" -> CORE_TD(CoreDoUSPInf)
518 "-fcpr-analyse" -> CORE_TD(CoreDoCPResult)
520 "-fstg-static-args" -> STG_TD(StgDoStaticArgs)
521 "-dstg-stats" -> STG_TD(D_stg_stats)
522 "-flambda-lift" -> STG_TD(StgDoLambdaLift)
523 "-fmassage-stg-for-profiling" -> STG_TD(StgDoMassageForProfiling)
525 _ -> -- NB: the driver is really supposed to handle bad options
526 sep opts core_td stg_td
530 simpl_sep :: [FAST_STRING] -- cmd-line opts (input)
531 -> [SimplifierSwitch] -- simplifier-switch accumulator
532 -> [CoreToDo] -> [StgToDo] -- to_do accumulators
533 -> ([CoreToDo], [StgToDo]) -- result
535 -- "simpl_sep" tailcalls "sep" once it's seen one set
536 -- of SimplifierSwitches for a CoreDoSimplify.
539 simpl_sep input@[] simpl_sw core_td stg_td
540 = panic "simpl_sep []"
543 -- The SimplifierSwitches should be delimited by "[" and "]".
545 simpl_sep (opt1:opts) simpl_sw core_td stg_td
546 = case (_UNPK_ opt1) of
547 "[" -> simpl_sep opts simpl_sw core_td stg_td
549 this_simpl = CoreDoSimplify (isAmongSimpl simpl_sw)
551 sep opts (this_simpl : core_td) stg_td
553 opt -> case matchSimplSw opt of
554 Just sw -> simpl_sep opts (sw:simpl_sw) core_td stg_td
555 Nothing -> simpl_sep opts simpl_sw core_td stg_td
558 = firstJust [ matchSwInt opt "-fmax-simplifier-iterations" MaxSimplifierIterations
559 , matchSwInt opt "-finline-phase" SimplInlinePhase
560 , matchSwBool opt "-fno-rules" DontApplyRules
561 , matchSwBool opt "-fno-case-of-case" NoCaseOfCase
562 , matchSwBool opt "-flet-to-case" SimplLetToCase
565 matchSwBool :: String -> String -> a -> Maybe a
566 matchSwBool opt str sw | opt == str = Just sw
567 | otherwise = Nothing
569 matchSwInt :: String -> String -> (Int -> a) -> Maybe a
570 matchSwInt opt str sw = case startsWith str opt of
571 Just opt_left -> Just (sw (read opt_left))
575 %************************************************************************
577 \subsection{Switch ordering}
579 %************************************************************************
581 In spite of the @Produce*@ constructor, these things behave just like
585 instance Eq SimplifierSwitch where
586 a == b = tagOf_SimplSwitch a _EQ_ tagOf_SimplSwitch b
588 instance Ord SimplifierSwitch where
589 a < b = tagOf_SimplSwitch a _LT_ tagOf_SimplSwitch b
590 a <= b = tagOf_SimplSwitch a _LE_ tagOf_SimplSwitch b
593 tagOf_SimplSwitch (SimplInlinePhase _) = ILIT(1)
594 tagOf_SimplSwitch (MaxSimplifierIterations _) = ILIT(2)
595 tagOf_SimplSwitch DontApplyRules = ILIT(3)
596 tagOf_SimplSwitch SimplLetToCase = ILIT(4)
597 tagOf_SimplSwitch NoCaseOfCase = ILIT(5)
599 -- If you add anything here, be sure to change lAST_SIMPL_SWITCH_TAG, too!
601 lAST_SIMPL_SWITCH_TAG = 5
604 %************************************************************************
606 \subsection{Switch lookup}
608 %************************************************************************
611 isAmongSimpl :: [SimplifierSwitch] -> SimplifierSwitch -> SwitchResult
613 isAmongSimpl on_switches -- Switches mentioned later occur *earlier*
614 -- in the list; defaults right at the end.
616 tidied_on_switches = foldl rm_dups [] on_switches
617 -- The fold*l* ensures that we keep the latest switches;
618 -- ie the ones that occur earliest in the list.
620 sw_tbl :: Array Int SwitchResult
621 sw_tbl = (array (0, lAST_SIMPL_SWITCH_TAG) -- bounds...
625 all_undefined = [ (i, SwBool False) | i <- [0 .. lAST_SIMPL_SWITCH_TAG ] ]
627 defined_elems = map mk_assoc_elem tidied_on_switches
629 -- (avoid some unboxing, bounds checking, and other horrible things:)
630 #if __GLASGOW_HASKELL__ < 405
631 case sw_tbl of { Array bounds_who_needs_'em stuff ->
633 case sw_tbl of { Array _ _ stuff ->
636 case (indexArray# stuff (tagOf_SimplSwitch switch)) of
637 #if __GLASGOW_HASKELL__ < 400
639 #elif __GLASGOW_HASKELL__ < 403
646 mk_assoc_elem k@(MaxSimplifierIterations lvl) = (IBOX(tagOf_SimplSwitch k), SwInt lvl)
647 mk_assoc_elem k@(SimplInlinePhase n) = (IBOX(tagOf_SimplSwitch k), SwInt n)
648 mk_assoc_elem k = (IBOX(tagOf_SimplSwitch k), SwBool True) -- I'm here, Mom!
650 -- cannot have duplicates if we are going to use the array thing
651 rm_dups switches_so_far switch
652 = if switch `is_elem` switches_so_far
654 else switch : switches_so_far
656 sw `is_elem` [] = False
657 sw `is_elem` (s:ss) = (tagOf_SimplSwitch sw) _EQ_ (tagOf_SimplSwitch s)
661 Default settings for simplifier switches
664 defaultSimplSwitches = [MaxSimplifierIterations 1]
667 %************************************************************************
669 \subsection{Misc functions for command-line options}
671 %************************************************************************
675 switchIsOn :: (switch -> SwitchResult) -> switch -> Bool
677 switchIsOn lookup_fn switch
678 = case (lookup_fn switch) of
679 SwBool False -> False
682 intSwitchSet :: (switch -> SwitchResult)
686 intSwitchSet lookup_fn switch
687 = case (lookup_fn (switch (panic "intSwitchSet"))) of
688 SwInt int -> Just int
693 startsWith :: String -> String -> Maybe String
694 -- startsWith pfx (pfx++rest) = Just rest
696 startsWith [] str = Just str
697 startsWith (c:cs) (s:ss)
698 = if c /= s then Nothing else startsWith cs ss
699 startsWith _ [] = Nothing
701 endsWith :: String -> String -> Maybe String
703 = case (startsWith (reverse cs) (reverse ss)) of
705 Just rs -> Just (reverse rs)