2 % (c) The AQUA Project, Glasgow University, 1996
4 \section[CmdLineOpts]{Things to do with command-line options}
17 maybe_CompilingGhcInternals,
19 opt_AllowOverlappingInstances,
20 opt_AutoSccsOnAllToplevs,
21 opt_AutoSccsOnExportedToplevs,
22 opt_AutoSccsOnIndividualCafs,
23 opt_CompilingGhcInternals,
29 opt_D_dump_occur_anal,
34 opt_D_dump_simpl_iterations,
41 opt_D_show_rn_imports,
42 opt_D_simplifier_stats,
44 opt_D_verbose_core2core,
45 opt_D_verbose_stg2stg,
51 opt_EnsureSplittableC,
57 opt_IgnoreIfacePragmas,
58 opt_IrrefutableTuples,
59 opt_LiberateCaseThreshold,
60 opt_MultiParamClasses,
61 opt_NoImplicitPrelude,
64 opt_OmitInterfacePragmas,
67 opt_PprStyle_User, -- ToDo: rm
72 opt_ReportWhyUnfoldingsDisallowed,
73 opt_ReturnInRegsThreshold,
80 opt_SpecialiseImports,
81 opt_SpecialiseOverloaded,
83 opt_SpecialiseUnboxed,
84 opt_StgDoLetNoEscapes,
86 opt_InterfaceUnfoldThreshold,
87 opt_UnfoldingCreationThreshold,
88 opt_UnfoldingConDiscount,
89 opt_UnfoldingUseThreshold,
90 opt_UnfoldingKeenessFactor,
93 opt_WarnNameShadowing,
94 opt_WarnUnusedMatches,
96 opt_WarnUnusedImports,
97 opt_WarnIncompletePatterns,
98 opt_WarnOverlappingPatterns,
99 opt_WarnSimplePatterns,
100 opt_WarnMissingMethods,
101 opt_WarnDuplicateExports,
102 opt_PruneTyDecls, opt_PruneInstDecls,
106 #include "HsVersions.h"
108 import Array ( array, (//) )
111 import Constants -- Default values for some flags
113 import Maybes ( assocMaybe, firstJust, maybeToBool )
114 import Util ( startsWith, panic, panic# )
116 #if __GLASGOW_HASKELL__ < 301
117 import ArrBase ( Array(..) )
119 import PrelArr ( Array(..) )
123 A command-line {\em switch} is (generally) either on or off; e.g., the
124 ``verbose'' (-v) switch is either on or off. (The \tr{-G<group>}
125 switch is an exception; it's set to a string, or nothing.)
127 A list of {\em ToDo}s is things to be done in a particular part of
128 processing. A (fictitious) example for the Core-to-Core simplifier
129 might be: run the simplifier, then run the strictness analyser, then
130 run the simplifier again (three ``todos'').
132 There are three ``to-do processing centers'' at the moment. In the
133 main loop (\tr{main/Main.lhs}), in the Core-to-Core processing loop
134 (\tr{simplCore/SimplCore.lhs), and in the STG-to-STG processing loop
135 (\tr{simplStg/SimplStg.lhs}).
137 %************************************************************************
139 \subsection{Datatypes associated with command-line options}
141 %************************************************************************
145 = SwBool Bool -- on/off
146 | SwString FAST_STRING -- nothing or a String
147 | SwInt Int -- nothing or an Int
151 data CoreToDo -- These are diff core-to-core passes,
152 -- which may be invoked in any order,
153 -- as many times as you like.
155 = CoreDoSimplify -- The core-to-core simplifier.
156 (SimplifierSwitch -> SwitchResult)
157 -- Each run of the simplifier can take a different
158 -- set of simplifier-specific flags.
159 | CoreDoCalcInlinings1
160 | CoreDoCalcInlinings2
168 | CoreDoFoldrBuildWorkerWrapper
169 | CoreDoFoldrBuildWWAnal
175 | StgDoUpdateAnalysis
177 | StgDoMassageForProfiling -- should be (next to) last
178 -- There's also setStgVarInfo, but its absolute "lastness"
179 -- is so critical that it is hardwired in (no flag).
184 data SimplifierSwitch
186 | SimplFloatLetsExposingWHNF
187 | SimplOkToFloatPrimOps
188 | SimplAlwaysFloatLetsFromLets
193 | SimplMayDeleteConjurableIds
194 | SimplPedanticBottoms -- see Simplifier for an explanation
195 | SimplDoArityExpand -- expand arity of bindings
196 | SimplDoFoldrBuild -- This is the per-simplification flag;
197 -- see also FoldrBuildOn, used elsewhere
199 | SimplDoInlineFoldrBuild
200 -- inline foldr/build (*after* f/b rule is used)
203 | SimplDoLambdaEtaExpansion
205 | EssentialUnfoldingsOnly -- never mind the thresholds, only
206 -- do unfoldings that *must* be done
207 -- (to saturate constructors and primitives)
209 | ShowSimplifierProgress -- report counts on every interation
211 | MaxSimplifierIterations Int
213 | SimplNoLetFromCase -- used when turning off floating entirely
214 | SimplNoLetFromApp -- (for experimentation only) WDP 95/10
215 | SimplNoLetFromStrictLet
217 | SimplDontFoldBackAppend
218 -- we fold `foldr (:)' back into flip (++),
219 -- but we *don't* want to do it when compiling
220 -- List.hs, otherwise
221 -- xs ++ ys = foldr (:) ys xs
222 -- {- via our loopback -}
223 -- xs ++ ys = xs ++ ys
225 -- So only use this flag inside List.hs
226 -- (Sigh, what a HACK, Andy. WDP 96/01)
229 | SimplCaseScrutinee -- This flag tells that the expression being simplified is
230 -- the scrutinee of a case expression, so we should
231 -- apply the scrutinee discount when considering inlinings.
235 %************************************************************************
237 \subsection{Classifying command-line options}
239 %************************************************************************
242 lookUp :: FAST_STRING -> Bool
243 lookup_int :: String -> Maybe Int
244 lookup_def_int :: String -> Int -> Int
245 lookup_def_float :: String -> Float -> Float
246 lookup_str :: String -> Maybe String
248 lookUp sw = maybeToBool (assoc_opts sw)
250 lookup_str sw = firstJust (map (startsWith sw) unpacked_opts)
252 lookup_int sw = case (lookup_str sw) of
254 Just xx -> Just (read xx)
256 lookup_def_int sw def = case (lookup_str sw) of
257 Nothing -> def -- Use default
260 lookup_def_float sw def = case (lookup_str sw) of
261 Nothing -> def -- Use default
264 assoc_opts = assocMaybe [ (a, True) | a <- argv ]
265 unpacked_opts = map _UNPK_ argv
269 opt_AllStrict = lookUp SLIT("-fall-strict")
270 opt_AllowOverlappingInstances = lookUp SLIT("-fallow-overlapping-instances")
271 opt_AutoSccsOnAllToplevs = lookUp SLIT("-fauto-sccs-on-all-toplevs")
272 opt_AutoSccsOnExportedToplevs = lookUp SLIT("-fauto-sccs-on-exported-toplevs")
273 opt_AutoSccsOnIndividualCafs = lookUp SLIT("-fauto-sccs-on-individual-cafs")
274 opt_CompilingGhcInternals = maybeToBool maybe_CompilingGhcInternals
275 maybe_CompilingGhcInternals = lookup_str "-fcompiling-ghc-internals="
276 opt_D_dump_absC = lookUp SLIT("-ddump-absC")
277 opt_D_dump_asm = lookUp SLIT("-ddump-asm")
278 opt_D_dump_deriv = lookUp SLIT("-ddump-deriv")
279 opt_D_dump_ds = lookUp SLIT("-ddump-ds")
280 opt_D_dump_flatC = lookUp SLIT("-ddump-flatC")
281 opt_D_dump_occur_anal = lookUp SLIT("-ddump-occur-anal")
282 opt_D_dump_rdr = lookUp SLIT("-ddump-rdr")
283 opt_D_dump_realC = lookUp SLIT("-ddump-realC")
284 opt_D_dump_rn = lookUp SLIT("-ddump-rn")
285 opt_D_dump_simpl = lookUp SLIT("-ddump-simpl")
286 opt_D_dump_simpl_iterations = lookUp SLIT("-ddump-simpl-iterations")
287 opt_D_dump_spec = lookUp SLIT("-ddump-spec")
288 opt_D_dump_stg = lookUp SLIT("-ddump-stg")
289 opt_D_dump_stranal = lookUp SLIT("-ddump-stranal")
290 opt_D_dump_tc = lookUp SLIT("-ddump-tc")
291 opt_D_show_passes = lookUp SLIT("-dshow-passes")
292 opt_D_show_rn_trace = lookUp SLIT("-dshow-rn-trace")
293 opt_D_show_rn_imports = lookUp SLIT("-dshow-rn-imports")
294 opt_D_simplifier_stats = lookUp SLIT("-dsimplifier-stats")
295 opt_D_source_stats = lookUp SLIT("-dsource-stats")
296 opt_D_verbose_core2core = lookUp SLIT("-dverbose-simpl")
297 opt_D_verbose_stg2stg = lookUp SLIT("-dverbose-stg")
298 opt_DoCoreLinting = lookUp SLIT("-dcore-lint")
299 opt_DoStgLinting = lookUp SLIT("-dstg-lint")
300 opt_DoSemiTagging = lookUp SLIT("-fsemi-tagging")
301 opt_DoTickyProfiling = lookUp SLIT("-fticky-ticky")
302 opt_DoEtaReduction = lookUp SLIT("-fdo-eta-reduction")
303 opt_EnsureSplittableC = lookUp SLIT("-fglobalise-toplev-names")
304 opt_FoldrBuildOn = lookUp SLIT("-ffoldr-build-on")
305 opt_ForConcurrent = lookUp SLIT("-fconcurrent")
306 opt_GranMacros = lookUp SLIT("-fgransim")
307 opt_GlasgowExts = lookUp SLIT("-fglasgow-exts")
308 opt_HiMap = lookup_str "-himap=" -- file saying where to look for .hi files
309 opt_IgnoreIfacePragmas = lookUp SLIT("-fignore-interface-pragmas")
310 opt_IrrefutableTuples = lookUp SLIT("-firrefutable-tuples")
311 opt_MultiParamClasses = opt_GlasgowExts
312 opt_NoImplicitPrelude = lookUp SLIT("-fno-implicit-prelude")
313 opt_NoHiCheck = lookUp SLIT("-fno-hi-version-check")
314 opt_NumbersStrict = lookUp SLIT("-fnumbers-strict")
315 opt_OmitBlackHoling = lookUp SLIT("-dno-black-holing")
316 opt_OmitInterfacePragmas = lookUp SLIT("-fomit-interface-pragmas")
317 opt_PprStyle_All = lookUp SLIT("-dppr-all")
318 opt_PprStyle_Debug = lookUp SLIT("-dppr-debug")
319 opt_PprStyle_User = lookUp SLIT("-dppr-user")
320 opt_PprUserLength = lookup_def_int "-dppr-user-length" 5 --ToDo: give this a name
321 opt_ProduceC = lookup_str "-C="
322 opt_ProduceS = lookup_str "-S="
323 opt_ProduceHi = lookup_str "-hifile=" -- the one to produce this time
324 opt_ReportWhyUnfoldingsDisallowed= lookUp SLIT("-freport-disallowed-unfoldings")
325 opt_SccProfilingOn = lookUp SLIT("-fscc-profiling")
326 opt_ShowImportSpecs = lookUp SLIT("-fshow-import-specs")
327 opt_SigsRequired = lookUp SLIT("-fsignatures-required")
328 opt_SourceUnchanged = lookUp SLIT("-fsource-unchanged")
329 opt_SpecialiseAll = lookUp SLIT("-fspecialise-all")
330 opt_SpecialiseImports = lookUp SLIT("-fspecialise-imports")
331 opt_SpecialiseOverloaded = lookUp SLIT("-fspecialise-overloaded")
332 opt_SpecialiseTrace = lookUp SLIT("-ftrace-specialisation")
333 opt_SpecialiseUnboxed = lookUp SLIT("-fspecialise-unboxed")
334 opt_StgDoLetNoEscapes = lookUp SLIT("-flet-no-escape")
335 opt_ReturnInRegsThreshold = lookup_int "-freturn-in-regs-threshold"
336 opt_SccGroup = lookup_str "-G="
337 opt_Verbose = lookUp SLIT("-v")
339 opt_InterfaceUnfoldThreshold = lookup_def_int "-funfolding-interface-threshold" iNTERFACE_UNFOLD_THRESHOLD
340 opt_UnfoldingCreationThreshold = lookup_def_int "-funfolding-creation-threshold" uNFOLDING_CREATION_THRESHOLD
341 opt_UnfoldingUseThreshold = lookup_def_int "-funfolding-use-threshold" uNFOLDING_USE_THRESHOLD
342 opt_UnfoldingConDiscount = lookup_def_int "-funfolding-con-discount" uNFOLDING_CON_DISCOUNT_WEIGHT
344 opt_LiberateCaseThreshold = lookup_def_int "-fliberate-case-threshold" lIBERATE_CASE_THRESHOLD
345 opt_UnfoldingKeenessFactor = lookup_def_float "-funfolding-keeness-factor" uNFOLDING_KEENESS_FACTOR
346 opt_WarnNameShadowing = lookUp SLIT("-fwarn-name-shadowing")
347 opt_WarnIncompletePatterns = lookUp SLIT("-fwarn-incomplete-patterns")
348 opt_WarnOverlappingPatterns = lookUp SLIT("-fwarn-overlapping-patterns")
349 opt_WarnSimplePatterns = lookUp SLIT("-fwarn-simple-patterns")
350 opt_WarnUnusedMatches = lookUp SLIT("-fwarn-unused-matches")
351 opt_WarnUnusedBinds = lookUp SLIT("-fwarn-unused-binds")
352 opt_WarnUnusedImports = lookUp SLIT("-fwarn-unused-imports")
353 opt_WarnMissingMethods = lookUp SLIT("-fwarn-missing-methods")
354 opt_WarnDuplicateExports = lookUp SLIT("-fwarn-duplicate-exports")
355 opt_PruneTyDecls = not (lookUp SLIT("-fno-prune-tydecls"))
356 opt_PruneInstDecls = not (lookUp SLIT("-fno-prune-instdecls"))
357 opt_D_show_rn_stats = lookUp SLIT("-dshow-rn-stats")
359 -- opt_UnfoldingOverrideThreshold = lookup_int "-funfolding-override-threshold"
363 classifyOpts :: ([CoreToDo], -- Core-to-Core processing spec
364 [StgToDo]) -- STG-to-STG processing spec
366 classifyOpts = sep argv [] [] -- accumulators...
368 sep :: [FAST_STRING] -- cmd-line opts (input)
369 -> [CoreToDo] -> [StgToDo] -- to_do accumulators
370 -> ([CoreToDo], [StgToDo]) -- result
372 sep [] core_td stg_td -- all done!
373 = (reverse core_td, reverse stg_td)
375 # define CORE_TD(to_do) sep opts (to_do:core_td) stg_td
376 # define STG_TD(to_do) sep opts core_td (to_do:stg_td)
377 # define IGNORE_ARG() sep opts core_td stg_td
379 sep (opt1:opts) core_td stg_td
381 case (_UNPK_ opt1) of -- the non-"just match a string" options are at the end...
383 ',' : _ -> IGNORE_ARG() -- it is for the parser
385 "-fsimplify" -> -- gather up SimplifierSwitches specially...
386 simpl_sep opts defaultSimplSwitches core_td stg_td
388 "-fcalc-inlinings1"-> CORE_TD(CoreDoCalcInlinings1)
389 "-fcalc-inlinings2"-> CORE_TD(CoreDoCalcInlinings2)
390 "-ffloat-inwards" -> CORE_TD(CoreDoFloatInwards)
391 "-ffull-laziness" -> CORE_TD(CoreDoFullLaziness)
392 "-fliberate-case" -> CORE_TD(CoreLiberateCase)
393 "-fprint-core" -> CORE_TD(CoreDoPrintCore)
394 "-fstatic-args" -> CORE_TD(CoreDoStaticArgs)
395 "-fstrictness" -> CORE_TD(CoreDoStrictness)
396 "-fspecialise" -> CORE_TD(CoreDoSpecialising)
397 "-ffoldr-build-worker-wrapper" -> CORE_TD(CoreDoFoldrBuildWorkerWrapper)
398 "-ffoldr-build-ww-anal" -> CORE_TD(CoreDoFoldrBuildWWAnal)
400 "-fstg-static-args" -> STG_TD(StgDoStaticArgs)
401 "-fupdate-analysis" -> STG_TD(StgDoUpdateAnalysis)
402 "-dstg-stats" -> STG_TD(D_stg_stats)
403 "-flambda-lift" -> STG_TD(StgDoLambdaLift)
404 "-fmassage-stg-for-profiling" -> STG_TD(StgDoMassageForProfiling)
406 _ -> -- NB: the driver is really supposed to handle bad options
411 simpl_sep :: [FAST_STRING] -- cmd-line opts (input)
412 -> [SimplifierSwitch] -- simplifier-switch accumulator
413 -> [CoreToDo] -> [StgToDo] -- to_do accumulators
414 -> ([CoreToDo], [StgToDo]) -- result
416 -- "simpl_sep" tailcalls "sep" once it's seen one set
417 -- of SimplifierSwitches for a CoreDoSimplify.
420 simpl_sep input@[] simpl_sw core_td stg_td
421 = panic "simpl_sep []"
424 -- The SimplifierSwitches should be delimited by "[" and "]".
426 simpl_sep (opt1:opts) simpl_sw core_td stg_td
427 = case (_UNPK_ opt1) of
428 "[" -> simpl_sep opts simpl_sw core_td stg_td
430 this_simpl = CoreDoSimplify (isAmongSimpl simpl_sw)
432 sep opts (this_simpl : core_td) stg_td
434 # define SIMPL_SW(sw) simpl_sep opts (sw:simpl_sw) core_td stg_td
436 -- the non-"just match a string" options are at the end...
437 "-fshow-simplifier-progress" -> SIMPL_SW(ShowSimplifierProgress)
438 "-fcode-duplication-ok" -> SIMPL_SW(SimplOkToDupCode)
439 "-ffloat-lets-exposing-whnf" -> SIMPL_SW(SimplFloatLetsExposingWHNF)
440 "-ffloat-primops-ok" -> SIMPL_SW(SimplOkToFloatPrimOps)
441 "-falways-float-lets-from-lets" -> SIMPL_SW(SimplAlwaysFloatLetsFromLets)
442 "-fdo-case-elim" -> SIMPL_SW(SimplDoCaseElim)
443 "-fdo-lambda-eta-expansion" -> SIMPL_SW(SimplDoLambdaEtaExpansion)
444 "-fdo-foldr-build" -> SIMPL_SW(SimplDoFoldrBuild)
445 "-fdo-not-fold-back-append" -> SIMPL_SW(SimplDontFoldBackAppend)
446 "-fdo-arity-expand" -> SIMPL_SW(SimplDoArityExpand)
447 "-fdo-inline-foldr-build" -> SIMPL_SW(SimplDoInlineFoldrBuild)
448 "-freuse-con" -> SIMPL_SW(SimplReuseCon)
449 "-fcase-of-case" -> SIMPL_SW(SimplCaseOfCase)
450 "-fcase-merge" -> SIMPL_SW(SimplCaseMerge)
451 "-flet-to-case" -> SIMPL_SW(SimplLetToCase)
452 "-fpedantic-bottoms" -> SIMPL_SW(SimplPedanticBottoms)
453 "-fmay-delete-conjurable-ids" -> SIMPL_SW(SimplMayDeleteConjurableIds)
454 "-fessential-unfoldings-only" -> SIMPL_SW(EssentialUnfoldingsOnly)
455 "-fignore-inline-pragma" -> SIMPL_SW(IgnoreINLINEPragma)
456 "-fno-let-from-case" -> SIMPL_SW(SimplNoLetFromCase)
457 "-fno-let-from-app" -> SIMPL_SW(SimplNoLetFromApp)
458 "-fno-let-from-strict-let" -> SIMPL_SW(SimplNoLetFromStrictLet)
460 o | starts_with_msi -> SIMPL_SW(MaxSimplifierIterations (read after_msi))
462 maybe_msi = startsWith "-fmax-simplifier-iterations" o
463 starts_with_msi = maybeToBool maybe_msi
464 (Just after_msi) = maybe_msi
466 _ -> -- NB: the driver is really supposed to handle bad options
467 simpl_sep opts simpl_sw core_td stg_td
470 %************************************************************************
472 \subsection{Switch ordering}
474 %************************************************************************
476 In spite of the @Produce*@ and @SccGroup@ constructors, these things
477 behave just like enumeration types.
480 instance Eq SimplifierSwitch where
481 a == b = tagOf_SimplSwitch a _EQ_ tagOf_SimplSwitch b
483 instance Ord SimplifierSwitch where
484 a < b = tagOf_SimplSwitch a _LT_ tagOf_SimplSwitch b
485 a <= b = tagOf_SimplSwitch a _LE_ tagOf_SimplSwitch b
487 tagOf_SimplSwitch SimplOkToDupCode =(ILIT(0) :: FAST_INT)
488 tagOf_SimplSwitch SimplFloatLetsExposingWHNF = ILIT(1)
489 tagOf_SimplSwitch SimplOkToFloatPrimOps = ILIT(2)
490 tagOf_SimplSwitch SimplAlwaysFloatLetsFromLets = ILIT(3)
491 tagOf_SimplSwitch SimplDoCaseElim = ILIT(4)
492 tagOf_SimplSwitch SimplReuseCon = ILIT(5)
493 tagOf_SimplSwitch SimplCaseOfCase = ILIT(6)
494 tagOf_SimplSwitch SimplLetToCase = ILIT(7)
495 tagOf_SimplSwitch SimplMayDeleteConjurableIds = ILIT(9)
496 tagOf_SimplSwitch SimplPedanticBottoms = ILIT(10)
497 tagOf_SimplSwitch SimplDoArityExpand = ILIT(11)
498 tagOf_SimplSwitch SimplDoFoldrBuild = ILIT(12)
499 tagOf_SimplSwitch SimplDoInlineFoldrBuild = ILIT(14)
500 tagOf_SimplSwitch IgnoreINLINEPragma = ILIT(15)
501 tagOf_SimplSwitch SimplDoLambdaEtaExpansion = ILIT(16)
502 tagOf_SimplSwitch EssentialUnfoldingsOnly = ILIT(19)
503 tagOf_SimplSwitch ShowSimplifierProgress = ILIT(20)
504 tagOf_SimplSwitch (MaxSimplifierIterations _) = ILIT(21)
505 tagOf_SimplSwitch SimplNoLetFromCase = ILIT(27)
506 tagOf_SimplSwitch SimplNoLetFromApp = ILIT(28)
507 tagOf_SimplSwitch SimplNoLetFromStrictLet = ILIT(29)
508 tagOf_SimplSwitch SimplDontFoldBackAppend = ILIT(30)
509 tagOf_SimplSwitch SimplCaseMerge = ILIT(31)
510 tagOf_SimplSwitch SimplCaseScrutinee = ILIT(32)
512 -- If you add anything here, be sure to change lAST_SIMPL_SWITCH_TAG, too!
514 tagOf_SimplSwitch _ = panic# "tagOf_SimplSwitch"
516 lAST_SIMPL_SWITCH_TAG = IBOX(tagOf_SimplSwitch SimplCaseScrutinee)
519 %************************************************************************
521 \subsection{Switch lookup}
523 %************************************************************************
531 isAmongSimpl :: [SimplifierSwitch] -> SimplifierSwitch -> SwitchResult
533 isAmongSimpl on_switches -- Switches mentioned later occur *earlier*
534 -- in the list; defaults right at the end.
536 tidied_on_switches = foldl rm_dups [] on_switches
537 -- The fold*l* ensures that we keep the latest switches;
538 -- ie the ones that occur earliest in the list.
540 sw_tbl :: Array Int SwitchResult
542 sw_tbl = (array (0, lAST_SIMPL_SWITCH_TAG) -- bounds...
546 all_undefined = [ i SET_TO SwBool False | i <- [0 .. lAST_SIMPL_SWITCH_TAG ] ]
548 defined_elems = map mk_assoc_elem tidied_on_switches
550 -- (avoid some unboxing, bounds checking, and other horrible things:)
551 case sw_tbl of { ARRAY bounds_who_needs_'em stuff ->
553 case (indexArray# stuff (tagOf_SimplSwitch switch)) of
557 mk_assoc_elem k@(MaxSimplifierIterations lvl) = IBOX(tagOf_SimplSwitch k) SET_TO SwInt lvl
559 mk_assoc_elem k = IBOX(tagOf_SimplSwitch k) SET_TO SwBool True -- I'm here, Mom!
561 -- cannot have duplicates if we are going to use the array thing
562 rm_dups switches_so_far switch
563 = if switch `is_elem` switches_so_far
565 else switch : switches_so_far
567 sw `is_elem` [] = False
568 sw `is_elem` (s:ss) = (tagOf_SimplSwitch sw) _EQ_ (tagOf_SimplSwitch s)
572 Default settings for simplifier switches
575 defaultSimplSwitches = [MaxSimplifierIterations 1
579 %************************************************************************
581 \subsection{Misc functions for command-line options}
583 %************************************************************************
587 switchIsOn :: (switch -> SwitchResult) -> switch -> Bool
589 switchIsOn lookup_fn switch
590 = case (lookup_fn switch) of
591 SwBool False -> False
594 intSwitchSet :: (switch -> SwitchResult)
598 intSwitchSet lookup_fn switch
599 = case (lookup_fn (switch (panic "intSwitchSet"))) of
600 SwInt int -> Just int