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,
92 opt_IrrefutableTuples,
101 opt_LiberateCaseThreshold,
102 opt_StgDoLetNoEscapes,
105 opt_UnboxStrictFields,
106 opt_SimplNoPreInlining,
107 opt_SimplDoEtaReduction,
108 opt_SimplDoLambdaEtaExpansion,
111 opt_SimplPedanticBottoms,
112 opt_SimplExcessPrecision,
115 opt_UF_HiFileThreshold,
116 opt_UF_CreationThreshold,
118 opt_UF_FunAppDiscount,
119 opt_UF_KeenessFactor,
120 opt_UF_UpdateInPlace,
126 opt_EmitCExternDecls,
127 opt_EnsureSplittableC,
134 opt_IgnoreIfacePragmas,
136 opt_NoImplicitPrelude,
138 opt_OmitInterfacePragmas,
139 opt_ProduceExportCStubs,
140 opt_ProduceExportHStubs,
162 #include "HsVersions.h"
164 import Array ( array, (//) )
167 import Constants -- Default values for some flags
169 import FastString ( headFS )
170 import Maybes ( firstJust, maybeToBool )
171 import Panic ( panic, panic# )
173 #if __GLASGOW_HASKELL__ < 301
174 import ArrBase ( Array(..) )
176 import PrelArr ( Array(..) )
180 A command-line {\em switch} is (generally) either on or off; e.g., the
181 ``verbose'' (-v) switch is either on or off.
183 A list of {\em ToDo}s is things to be done in a particular part of
184 processing. A (fictitious) example for the Core-to-Core simplifier
185 might be: run the simplifier, then run the strictness analyser, then
186 run the simplifier again (three ``todos'').
188 There are three ``to-do processing centers'' at the moment. In the
189 main loop (\tr{main/Main.lhs}), in the Core-to-Core processing loop
190 (\tr{simplCore/SimplCore.lhs), and in the STG-to-STG processing loop
191 (\tr{simplStg/SimplStg.lhs}).
194 %************************************************************************
196 \subsection{Datatypes associated with command-line options}
198 %************************************************************************
202 = SwBool Bool -- on/off
203 | SwString FAST_STRING -- nothing or a String
204 | SwInt Int -- nothing or an Int
208 data CoreToDo -- These are diff core-to-core passes,
209 -- which may be invoked in any order,
210 -- as many times as you like.
212 = CoreDoSimplify -- The core-to-core simplifier.
213 (SimplifierSwitch -> SwitchResult)
214 -- Each run of the simplifier can take a different
215 -- set of simplifier-specific flags.
217 | CoreDoFloatOutwards Bool -- True <=> float lambdas to top level
222 | CoreDoWorkerWrapper
234 | StgDoMassageForProfiling -- should be (next to) last
235 -- There's also setStgVarInfo, but its absolute "lastness"
236 -- is so critical that it is hardwired in (no flag).
241 data SimplifierSwitch
242 = MaxSimplifierIterations Int
243 | SimplInlinePhase Int
249 %************************************************************************
251 \subsection{Classifying command-line options}
253 %************************************************************************
256 lookUp :: FAST_STRING -> Bool
257 lookup_int :: String -> Maybe Int
258 lookup_def_int :: String -> Int -> Int
259 lookup_def_float :: String -> Float -> Float
260 lookup_str :: String -> Maybe String
262 lookUp sw = sw `elem` argv
264 lookup_str sw = firstJust (map (startsWith sw) unpacked_opts)
266 lookup_int sw = case (lookup_str sw) of
268 Just xx -> Just (read xx)
270 lookup_def_int sw def = case (lookup_str sw) of
271 Nothing -> def -- Use default
274 lookup_def_char sw def = case (lookup_str sw) of
276 _ -> def -- Use default
278 lookup_def_float sw def = case (lookup_str sw) of
279 Nothing -> def -- Use default
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 unpacked_opts :: [String]
296 expandAts ('@':fname) = words (unsafePerformIO (readFile fname))
302 src_filename :: FAST_STRING
303 src_filename = case argv of
304 filename : rest | headFS filename /= '-' -> filename
305 otherwise -> panic "no filename"
310 opt_D_dump_all {- do not -} = lookUp SLIT("-ddump-all")
311 opt_D_dump_most {- export -} = opt_D_dump_all || lookUp SLIT("-ddump-most")
313 opt_D_dump_absC = opt_D_dump_all || lookUp SLIT("-ddump-absC")
314 opt_D_dump_asm = opt_D_dump_all || lookUp SLIT("-ddump-asm")
315 opt_D_dump_cpranal = opt_D_dump_most || lookUp SLIT("-ddump-cpranal")
316 opt_D_dump_deriv = opt_D_dump_most || lookUp SLIT("-ddump-deriv")
317 opt_D_dump_ds = opt_D_dump_most || lookUp SLIT("-ddump-ds")
318 opt_D_dump_flatC = opt_D_dump_all || lookUp SLIT("-ddump-flatC")
319 opt_D_dump_foreign = opt_D_dump_most || lookUp SLIT("-ddump-foreign-stubs")
320 opt_D_dump_inlinings = opt_D_dump_all || lookUp SLIT("-ddump-inlinings")
321 opt_D_dump_occur_anal = opt_D_dump_all || lookUp SLIT("-ddump-occur-anal")
322 opt_D_dump_parsed = opt_D_dump_most || lookUp SLIT("-ddump-parsed")
323 opt_D_dump_realC = opt_D_dump_all || lookUp SLIT("-ddump-realC")
324 opt_D_dump_rn = opt_D_dump_most || lookUp SLIT("-ddump-rn")
325 opt_D_dump_simpl = opt_D_dump_most || lookUp SLIT("-ddump-simpl")
326 opt_D_dump_simpl_iterations = opt_D_dump_all || lookUp SLIT("-ddump-simpl-iterations")
327 opt_D_dump_spec = opt_D_dump_most || lookUp SLIT("-ddump-spec")
328 opt_D_dump_stg = opt_D_dump_most || lookUp SLIT("-ddump-stg")
329 opt_D_dump_stranal = opt_D_dump_most || lookUp SLIT("-ddump-stranal")
330 opt_D_dump_tc = opt_D_dump_most || lookUp SLIT("-ddump-tc")
331 opt_D_dump_types = opt_D_dump_most || lookUp SLIT("-ddump-types")
332 opt_D_dump_rules = opt_D_dump_most || lookUp SLIT("-ddump-rules")
333 opt_D_dump_usagesp = opt_D_dump_most || lookUp SLIT("-ddump-usagesp")
334 opt_D_dump_cse = opt_D_dump_most || lookUp SLIT("-ddump-cse")
335 opt_D_dump_worker_wrapper = opt_D_dump_most || lookUp SLIT("-ddump-workwrap")
336 opt_D_show_passes = opt_D_dump_most || lookUp SLIT("-dshow-passes")
337 opt_D_dump_rn_trace = opt_D_dump_all || lookUp SLIT("-ddump-rn-trace")
338 opt_D_dump_rn_stats = opt_D_dump_most || lookUp SLIT("-ddump-rn-stats")
339 opt_D_dump_stix = opt_D_dump_all || lookUp SLIT("-ddump-stix")
340 opt_D_dump_simpl_stats = opt_D_dump_most || lookUp SLIT("-ddump-simpl-stats")
341 opt_D_source_stats = opt_D_dump_most || lookUp SLIT("-dsource-stats")
342 opt_D_verbose_core2core = opt_D_dump_all || lookUp SLIT("-dverbose-simpl")
343 opt_D_verbose_stg2stg = opt_D_dump_all || lookUp SLIT("-dverbose-stg")
344 opt_D_dump_hi_diffs = opt_D_dump_all || lookUp SLIT("-ddump-hi-diffs")
346 opt_D_dump_minimal_imports = lookUp SLIT("-ddump-minimal-imports")
348 opt_DoCoreLinting = lookUp SLIT("-dcore-lint")
349 opt_DoStgLinting = lookUp SLIT("-dstg-lint")
350 opt_DoUSPLinting = lookUp SLIT("-dusagesp-lint")
351 opt_PprStyle_NoPrags = lookUp SLIT("-dppr-noprags")
352 opt_PprStyle_Debug = lookUp SLIT("-dppr-debug")
353 opt_PprUserLength = lookup_def_int "-dppr-user-length" 5 --ToDo: give this a name
356 opt_WarnDuplicateExports = lookUp SLIT("-fwarn-duplicate-exports")
357 opt_WarnHiShadows = lookUp SLIT("-fwarn-hi-shadowing")
358 opt_WarnIncompletePatterns = lookUp SLIT("-fwarn-incomplete-patterns")
359 opt_WarnMissingFields = lookUp SLIT("-fwarn-missing-fields")
360 opt_WarnMissingMethods = lookUp SLIT("-fwarn-missing-methods")
361 opt_WarnMissingSigs = lookUp SLIT("-fwarn-missing-signatures")
362 opt_WarnNameShadowing = lookUp SLIT("-fwarn-name-shadowing")
363 opt_WarnOverlappingPatterns = lookUp SLIT("-fwarn-overlapping-patterns")
364 opt_WarnSimplePatterns = lookUp SLIT("-fwarn-simple-patterns")
365 opt_WarnTypeDefaults = lookUp SLIT("-fwarn-type-defaults")
366 opt_WarnUnusedBinds = lookUp SLIT("-fwarn-unused-binds")
367 opt_WarnUnusedImports = lookUp SLIT("-fwarn-unused-imports")
368 opt_WarnUnusedMatches = lookUp SLIT("-fwarn-unused-matches")
369 opt_WarnDeprecations = lookUp SLIT("-fwarn-deprecations")
372 opt_AutoSccsOnAllToplevs = lookUp SLIT("-fauto-sccs-on-all-toplevs")
373 opt_AutoSccsOnExportedToplevs = lookUp SLIT("-fauto-sccs-on-exported-toplevs")
374 opt_AutoSccsOnIndividualCafs = lookUp SLIT("-fauto-sccs-on-individual-cafs")
375 opt_AutoSccsOnDicts = lookUp SLIT("-fauto-sccs-on-dicts")
376 opt_SccProfilingOn = lookUp SLIT("-fscc-profiling")
377 opt_DoTickyProfiling = lookUp SLIT("-fticky-ticky")
380 opt_AllStrict = lookUp SLIT("-fall-strict")
381 opt_DictsStrict = lookUp SLIT("-fdicts-strict")
382 opt_AllowOverlappingInstances = lookUp SLIT("-fallow-overlapping-instances")
383 opt_AllowUndecidableInstances = lookUp SLIT("-fallow-undecidable-instances")
384 opt_GlasgowExts = lookUp SLIT("-fglasgow-exts")
385 opt_Generics = lookUp SLIT("-fgenerics")
386 opt_IrrefutableTuples = lookUp SLIT("-firrefutable-tuples")
387 opt_MaxContextReductionDepth = lookup_def_int "-fcontext-stack" mAX_CONTEXT_REDUCTION_DEPTH
388 opt_NumbersStrict = lookUp SLIT("-fnumbers-strict")
389 opt_Parallel = lookUp SLIT("-fparallel")
390 opt_SMP = lookUp SLIT("-fsmp")
393 opt_DoEtaReduction = lookUp SLIT("-fdo-eta-reduction")
394 opt_DoSemiTagging = lookUp SLIT("-fsemi-tagging")
395 opt_FoldrBuildOn = lookUp SLIT("-ffoldr-build-on")
396 opt_LiberateCaseThreshold = lookup_def_int "-fliberate-case-threshold" (10::Int)
397 opt_StgDoLetNoEscapes = lookUp SLIT("-flet-no-escape")
398 opt_UnfoldCasms = lookUp SLIT("-funfold-casms-in-hi-file")
399 opt_UsageSPOn = lookUp SLIT("-fusagesp-on")
400 opt_UnboxStrictFields = lookUp SLIT("-funbox-strict-fields")
403 The optional '-inpackage=P' flag tells what package
404 we are compiling this module for.
405 The Prelude, for example is compiled with '-package prelude'
407 opt_InPackage = case lookup_str "-inpackage=" of
409 Nothing -> SLIT("Main") -- The package name if none is specified
411 opt_EmitCExternDecls = lookUp SLIT("-femit-extern-decls")
412 opt_EnsureSplittableC = lookUp SLIT("-fglobalise-toplev-names")
413 opt_GranMacros = lookUp SLIT("-fgransim")
414 opt_HiMap = lookup_str "-himap=" -- file saying where to look for .hi files
415 opt_HiMapSep = lookup_def_char "-himap-sep=" ':'
416 opt_HiVersion = lookup_def_int "-fhi-version=" 0 -- what version we're compiling.
417 opt_HistorySize = lookup_def_int "-fhistory-size" 20
418 opt_IgnoreAsserts = lookUp SLIT("-fignore-asserts")
419 opt_IgnoreIfacePragmas = lookUp SLIT("-fignore-interface-pragmas")
420 opt_NoHiCheck = lookUp SLIT("-fno-hi-version-check")
421 opt_NoImplicitPrelude = lookUp SLIT("-fno-implicit-prelude")
422 opt_OmitBlackHoling = lookUp SLIT("-dno-black-holing")
423 opt_OmitInterfacePragmas = lookUp SLIT("-fomit-interface-pragmas")
424 opt_ProduceExportCStubs = lookup_str "-F="
425 opt_ProduceExportHStubs = lookup_str "-FH="
427 -- where to generate the .hi file
428 opt_HiFile = lookup_str "-hifile="
429 opt_HiDir = lookup_str "-hidir="
430 opt_HiSuf = lookup_str "-hisuf="
432 -- Language for output: "C", "asm", "java", maybe more
433 -- Nothing => don't output anything
434 opt_OutputLanguage :: Maybe String
435 opt_OutputLanguage = lookup_str "-olang="
437 opt_OutputFile :: String
438 opt_OutputFile = case lookup_str "-ofile=" of
439 Nothing -> panic "No output file specified (-ofile=xxx)"
442 -- Simplifier switches
443 opt_SimplNoPreInlining = lookUp SLIT("-fno-pre-inlining")
444 -- NoPreInlining is there just to see how bad things
445 -- get if you don't do it!
446 opt_SimplDoEtaReduction = lookUp SLIT("-fdo-eta-reduction")
447 opt_SimplDoLambdaEtaExpansion = lookUp SLIT("-fdo-lambda-eta-expansion")
448 opt_SimplCaseOfCase = lookUp SLIT("-fcase-of-case")
449 opt_SimplCaseMerge = lookUp SLIT("-fcase-merge")
450 opt_SimplPedanticBottoms = lookUp SLIT("-fpedantic-bottoms")
451 opt_SimplExcessPrecision = lookUp SLIT("-fexcess-precision")
454 opt_UF_HiFileThreshold = lookup_def_int "-funfolding-interface-threshold" (45::Int)
455 opt_UF_CreationThreshold = lookup_def_int "-funfolding-creation-threshold" (45::Int)
456 opt_UF_UseThreshold = lookup_def_int "-funfolding-use-threshold" (8::Int) -- Discounts can be big
457 opt_UF_FunAppDiscount = lookup_def_int "-funfolding-fun-discount" (6::Int) -- It's great to inline a fn
458 opt_UF_KeenessFactor = lookup_def_float "-funfolding-keeness-factor" (1.5::Float)
459 opt_UF_UpdateInPlace = lookUp SLIT("-funfolding-update-in-place")
461 opt_UF_CheapOp = ( 1 :: Int) -- Only one instruction; and the args are charged for
462 opt_UF_DearOp = ( 4 :: Int)
464 opt_ReportCompile = lookUp SLIT("-freport-compile")
465 opt_NoPruneDecls = lookUp SLIT("-fno-prune-decls")
466 opt_NoPruneTyDecls = lookUp SLIT("-fno-prune-tydecls")
467 opt_SourceUnchanged = lookUp SLIT("-fsource-unchanged")
468 opt_Static = lookUp SLIT("-static")
469 opt_Unregisterised = lookUp SLIT("-funregisterised")
470 opt_Verbose = lookUp SLIT("-v")
472 opt_UseVanillaRegs | opt_Unregisterised = 0
473 | otherwise = mAX_Real_Vanilla_REG
474 opt_UseFloatRegs | opt_Unregisterised = 0
475 | otherwise = mAX_Real_Float_REG
476 opt_UseDoubleRegs | opt_Unregisterised = 0
477 | otherwise = mAX_Real_Double_REG
478 opt_UseLongRegs | opt_Unregisterised = 0
479 | otherwise = mAX_Real_Long_REG
483 classifyOpts :: ([CoreToDo], -- Core-to-Core processing spec
484 [StgToDo]) -- STG-to-STG processing spec
486 classifyOpts = sep argv [] [] -- accumulators...
488 sep :: [FAST_STRING] -- cmd-line opts (input)
489 -> [CoreToDo] -> [StgToDo] -- to_do accumulators
490 -> ([CoreToDo], [StgToDo]) -- result
492 sep [] core_td stg_td -- all done!
493 = (reverse core_td, reverse stg_td)
495 # define CORE_TD(to_do) sep opts (to_do:core_td) stg_td
496 # define STG_TD(to_do) sep opts core_td (to_do:stg_td)
498 sep (opt1:opts) core_td stg_td
499 = case (_UNPK_ opt1) of -- the non-"just match a string" options are at the end...
500 ',' : _ -> sep opts core_td stg_td -- it is for the parser
502 "-fsimplify" -> -- gather up SimplifierSwitches specially...
503 simpl_sep opts defaultSimplSwitches core_td stg_td
505 "-ffloat-inwards" -> CORE_TD(CoreDoFloatInwards)
506 "-ffloat-outwards" -> CORE_TD(CoreDoFloatOutwards False)
507 "-ffloat-outwards-full" -> CORE_TD(CoreDoFloatOutwards True)
508 "-fliberate-case" -> CORE_TD(CoreLiberateCase)
509 "-fcse" -> CORE_TD(CoreCSE)
510 "-fglom-binds" -> CORE_TD(CoreDoGlomBinds)
511 "-fprint-core" -> CORE_TD(CoreDoPrintCore)
512 "-fstatic-args" -> CORE_TD(CoreDoStaticArgs)
513 "-fstrictness" -> CORE_TD(CoreDoStrictness)
514 "-fworker-wrapper" -> CORE_TD(CoreDoWorkerWrapper)
515 "-fspecialise" -> CORE_TD(CoreDoSpecialising)
516 "-fusagesp" -> CORE_TD(CoreDoUSPInf)
517 "-fcpr-analyse" -> CORE_TD(CoreDoCPResult)
519 "-fstg-static-args" -> STG_TD(StgDoStaticArgs)
520 "-dstg-stats" -> STG_TD(D_stg_stats)
521 "-flambda-lift" -> STG_TD(StgDoLambdaLift)
522 "-fmassage-stg-for-profiling" -> STG_TD(StgDoMassageForProfiling)
524 _ -> -- NB: the driver is really supposed to handle bad options
525 sep opts core_td stg_td
529 simpl_sep :: [FAST_STRING] -- cmd-line opts (input)
530 -> [SimplifierSwitch] -- simplifier-switch accumulator
531 -> [CoreToDo] -> [StgToDo] -- to_do accumulators
532 -> ([CoreToDo], [StgToDo]) -- result
534 -- "simpl_sep" tailcalls "sep" once it's seen one set
535 -- of SimplifierSwitches for a CoreDoSimplify.
538 simpl_sep input@[] simpl_sw core_td stg_td
539 = panic "simpl_sep []"
542 -- The SimplifierSwitches should be delimited by "[" and "]".
544 simpl_sep (opt1:opts) simpl_sw core_td stg_td
545 = case (_UNPK_ opt1) of
546 "[" -> simpl_sep opts simpl_sw core_td stg_td
548 this_simpl = CoreDoSimplify (isAmongSimpl simpl_sw)
550 sep opts (this_simpl : core_td) stg_td
552 opt -> case matchSimplSw opt of
553 Just sw -> simpl_sep opts (sw:simpl_sw) core_td stg_td
554 Nothing -> simpl_sep opts simpl_sw core_td stg_td
557 = firstJust [ matchSwInt opt "-fmax-simplifier-iterations" MaxSimplifierIterations
558 , matchSwInt opt "-finline-phase" SimplInlinePhase
559 , matchSwBool opt "-fno-rules" DontApplyRules
560 , matchSwBool opt "-fno-case-of-case" NoCaseOfCase
561 , matchSwBool opt "-flet-to-case" SimplLetToCase
564 matchSwBool :: String -> String -> a -> Maybe a
565 matchSwBool opt str sw | opt == str = Just sw
566 | otherwise = Nothing
568 matchSwInt :: String -> String -> (Int -> a) -> Maybe a
569 matchSwInt opt str sw = case startsWith str opt of
570 Just opt_left -> Just (sw (read opt_left))
574 %************************************************************************
576 \subsection{Switch ordering}
578 %************************************************************************
580 In spite of the @Produce*@ constructor, these things behave just like
584 instance Eq SimplifierSwitch where
585 a == b = tagOf_SimplSwitch a _EQ_ tagOf_SimplSwitch b
587 instance Ord SimplifierSwitch where
588 a < b = tagOf_SimplSwitch a _LT_ tagOf_SimplSwitch b
589 a <= b = tagOf_SimplSwitch a _LE_ tagOf_SimplSwitch b
592 tagOf_SimplSwitch (SimplInlinePhase _) = ILIT(1)
593 tagOf_SimplSwitch (MaxSimplifierIterations _) = ILIT(2)
594 tagOf_SimplSwitch DontApplyRules = ILIT(3)
595 tagOf_SimplSwitch SimplLetToCase = ILIT(4)
596 tagOf_SimplSwitch NoCaseOfCase = ILIT(5)
598 -- If you add anything here, be sure to change lAST_SIMPL_SWITCH_TAG, too!
600 lAST_SIMPL_SWITCH_TAG = 5
603 %************************************************************************
605 \subsection{Switch lookup}
607 %************************************************************************
610 isAmongSimpl :: [SimplifierSwitch] -> SimplifierSwitch -> SwitchResult
612 isAmongSimpl on_switches -- Switches mentioned later occur *earlier*
613 -- in the list; defaults right at the end.
615 tidied_on_switches = foldl rm_dups [] on_switches
616 -- The fold*l* ensures that we keep the latest switches;
617 -- ie the ones that occur earliest in the list.
619 sw_tbl :: Array Int SwitchResult
620 sw_tbl = (array (0, lAST_SIMPL_SWITCH_TAG) -- bounds...
624 all_undefined = [ (i, SwBool False) | i <- [0 .. lAST_SIMPL_SWITCH_TAG ] ]
626 defined_elems = map mk_assoc_elem tidied_on_switches
628 -- (avoid some unboxing, bounds checking, and other horrible things:)
629 #if __GLASGOW_HASKELL__ < 405
630 case sw_tbl of { Array bounds_who_needs_'em stuff ->
632 case sw_tbl of { Array _ _ stuff ->
635 case (indexArray# stuff (tagOf_SimplSwitch switch)) of
636 #if __GLASGOW_HASKELL__ < 400
638 #elif __GLASGOW_HASKELL__ < 403
645 mk_assoc_elem k@(MaxSimplifierIterations lvl) = (IBOX(tagOf_SimplSwitch k), SwInt lvl)
646 mk_assoc_elem k@(SimplInlinePhase n) = (IBOX(tagOf_SimplSwitch k), SwInt n)
647 mk_assoc_elem k = (IBOX(tagOf_SimplSwitch k), SwBool True) -- I'm here, Mom!
649 -- cannot have duplicates if we are going to use the array thing
650 rm_dups switches_so_far switch
651 = if switch `is_elem` switches_so_far
653 else switch : switches_so_far
655 sw `is_elem` [] = False
656 sw `is_elem` (s:ss) = (tagOf_SimplSwitch sw) _EQ_ (tagOf_SimplSwitch s)
660 Default settings for simplifier switches
663 defaultSimplSwitches = [MaxSimplifierIterations 1]
666 %************************************************************************
668 \subsection{Misc functions for command-line options}
670 %************************************************************************
674 switchIsOn :: (switch -> SwitchResult) -> switch -> Bool
676 switchIsOn lookup_fn switch
677 = case (lookup_fn switch) of
678 SwBool False -> False
681 intSwitchSet :: (switch -> SwitchResult)
685 intSwitchSet lookup_fn switch
686 = case (lookup_fn (switch (panic "intSwitchSet"))) of
687 SwInt int -> Just int
692 startsWith :: String -> String -> Maybe String
693 -- startsWith pfx (pfx++rest) = Just rest
695 startsWith [] str = Just str
696 startsWith (c:cs) (s:ss)
697 = if c /= s then Nothing else startsWith cs ss
698 startsWith _ [] = Nothing
700 endsWith :: String -> String -> Maybe String
702 = case (startsWith (reverse cs) (reverse ss)) of
704 Just rs -> Just (reverse rs)