2 % (c) The AQUA Project, Glasgow University, 1996-98
4 \section[CmdLineOpts]{Things to do with command-line options}
29 opt_D_dump_occur_anal,
35 opt_D_dump_simpl_iterations,
36 opt_D_dump_simpl_stats,
43 opt_D_dump_worker_wrapper,
48 opt_D_dump_minimal_imports,
50 opt_D_verbose_core2core,
51 opt_D_verbose_stg2stg,
60 opt_WarnDuplicateExports,
62 opt_WarnIncompletePatterns,
63 opt_WarnMissingFields,
64 opt_WarnMissingMethods,
66 opt_WarnNameShadowing,
67 opt_WarnOverlappingPatterns,
68 opt_WarnSimplePatterns,
71 opt_WarnUnusedImports,
72 opt_WarnUnusedMatches,
76 opt_AutoSccsOnAllToplevs,
77 opt_AutoSccsOnExportedToplevs,
78 opt_AutoSccsOnIndividualCafs,
86 opt_MaxContextReductionDepth,
87 opt_AllowOverlappingInstances,
88 opt_AllowUndecidableInstances,
90 opt_IrrefutableTuples,
99 opt_LiberateCaseThreshold,
100 opt_StgDoLetNoEscapes,
103 opt_UnboxStrictFields,
104 opt_SimplNoPreInlining,
105 opt_SimplDoEtaReduction,
106 opt_SimplDoLambdaEtaExpansion,
109 opt_SimplPedanticBottoms,
112 opt_UF_HiFileThreshold,
113 opt_UF_CreationThreshold,
115 opt_UF_ScrutConDiscount,
116 opt_UF_FunAppDiscount,
117 opt_UF_PrimArgDiscount,
118 opt_UF_KeenessFactor,
124 opt_EmitCExternDecls,
125 opt_EnsureSplittableC,
132 opt_IgnoreIfacePragmas,
134 opt_NoImplicitPrelude,
136 opt_OmitInterfacePragmas,
137 opt_ProduceExportCStubs,
138 opt_ProduceExportHStubs,
157 #include "HsVersions.h"
159 import Array ( array, (//) )
162 import Constants -- Default values for some flags
164 import FastString ( headFS )
165 import Maybes ( assocMaybe, firstJust, maybeToBool )
166 import Panic ( panic, panic# )
168 #if __GLASGOW_HASKELL__ < 301
169 import ArrBase ( Array(..) )
171 import PrelArr ( Array(..) )
175 A command-line {\em switch} is (generally) either on or off; e.g., the
176 ``verbose'' (-v) switch is either on or off.
178 A list of {\em ToDo}s is things to be done in a particular part of
179 processing. A (fictitious) example for the Core-to-Core simplifier
180 might be: run the simplifier, then run the strictness analyser, then
181 run the simplifier again (three ``todos'').
183 There are three ``to-do processing centers'' at the moment. In the
184 main loop (\tr{main/Main.lhs}), in the Core-to-Core processing loop
185 (\tr{simplCore/SimplCore.lhs), and in the STG-to-STG processing loop
186 (\tr{simplStg/SimplStg.lhs}).
189 %************************************************************************
191 \subsection{Datatypes associated with command-line options}
193 %************************************************************************
197 = SwBool Bool -- on/off
198 | SwString FAST_STRING -- nothing or a String
199 | SwInt Int -- nothing or an Int
203 data CoreToDo -- These are diff core-to-core passes,
204 -- which may be invoked in any order,
205 -- as many times as you like.
207 = CoreDoSimplify -- The core-to-core simplifier.
208 (SimplifierSwitch -> SwitchResult)
209 -- Each run of the simplifier can take a different
210 -- set of simplifier-specific flags.
212 | CoreDoFloatOutwards Bool -- True <=> float lambdas to top level
217 | CoreDoWorkerWrapper
228 | StgDoMassageForProfiling -- should be (next to) last
229 -- There's also setStgVarInfo, but its absolute "lastness"
230 -- is so critical that it is hardwired in (no flag).
235 data SimplifierSwitch
236 = MaxSimplifierIterations Int
237 | SimplInlinePhase Int
243 %************************************************************************
245 \subsection{Classifying command-line options}
247 %************************************************************************
250 lookUp :: FAST_STRING -> Bool
251 lookup_int :: String -> Maybe Int
252 lookup_def_int :: String -> Int -> Int
253 lookup_def_float :: String -> Float -> Float
254 lookup_str :: String -> Maybe String
256 lookUp sw = maybeToBool (assoc_opts sw)
258 lookup_str sw = firstJust (map (startsWith sw) unpacked_opts)
260 lookup_int sw = case (lookup_str sw) of
262 Just xx -> Just (read xx)
264 lookup_def_int sw def = case (lookup_str sw) of
265 Nothing -> def -- Use default
268 lookup_def_char sw def = case (lookup_str sw) of
270 _ -> def -- Use default
272 lookup_def_float sw def = case (lookup_str sw) of
273 Nothing -> def -- Use default
276 assoc_opts = assocMaybe [ (a, True) | a <- argv ]
277 unpacked_opts = map _UNPK_ argv
280 Putting the compiler options into temporary at-files
281 may turn out to be necessary later on if we turn hsc into
282 a pure Win32 application where I think there's a command-line
283 length limit of 255. unpacked_opts understands the @ option.
285 assoc_opts = assocMaybe [ (_PK_ a, True) | a <- unpacked_opts ]
287 unpacked_opts :: [String]
293 expandAts ('@':fname) = words (unsafePerformIO (readFile fname))
299 src_filename :: FAST_STRING
300 src_filename = case argv of
301 filename : rest | headFS filename /= '-' -> filename
302 otherwise -> panic "no filename"
307 opt_D_dump_all {- do not -} = lookUp SLIT("-ddump-all")
308 opt_D_dump_most {- export -} = opt_D_dump_all || lookUp SLIT("-ddump-most")
310 opt_D_dump_absC = opt_D_dump_all || lookUp SLIT("-ddump-absC")
311 opt_D_dump_asm = opt_D_dump_all || lookUp SLIT("-ddump-asm")
312 opt_D_dump_cpranal = opt_D_dump_most || lookUp SLIT("-ddump-cpranal")
313 opt_D_dump_deriv = opt_D_dump_most || lookUp SLIT("-ddump-deriv")
314 opt_D_dump_ds = opt_D_dump_most || lookUp SLIT("-ddump-ds")
315 opt_D_dump_flatC = opt_D_dump_all || lookUp SLIT("-ddump-flatC")
316 opt_D_dump_foreign = opt_D_dump_most || lookUp SLIT("-ddump-foreign-stubs")
317 opt_D_dump_inlinings = opt_D_dump_all || lookUp SLIT("-ddump-inlinings")
318 opt_D_dump_occur_anal = opt_D_dump_all || lookUp SLIT("-ddump-occur-anal")
319 opt_D_dump_parsed = opt_D_dump_most || lookUp SLIT("-ddump-parsed")
320 opt_D_dump_realC = opt_D_dump_all || lookUp SLIT("-ddump-realC")
321 opt_D_dump_rn = opt_D_dump_most || lookUp SLIT("-ddump-rn")
322 opt_D_dump_simpl = opt_D_dump_most || lookUp SLIT("-ddump-simpl")
323 opt_D_dump_simpl_iterations = opt_D_dump_all || lookUp SLIT("-ddump-simpl-iterations")
324 opt_D_dump_spec = opt_D_dump_most || lookUp SLIT("-ddump-spec")
325 opt_D_dump_stg = opt_D_dump_most || lookUp SLIT("-ddump-stg")
326 opt_D_dump_stranal = opt_D_dump_most || lookUp SLIT("-ddump-stranal")
327 opt_D_dump_tc = opt_D_dump_most || lookUp SLIT("-ddump-tc")
328 opt_D_dump_types = opt_D_dump_most || lookUp SLIT("-ddump-types")
329 opt_D_dump_rules = opt_D_dump_most || lookUp SLIT("-ddump-rules")
330 opt_D_dump_usagesp = opt_D_dump_most || lookUp SLIT("-ddump-usagesp")
331 opt_D_dump_cse = opt_D_dump_most || lookUp SLIT("-ddump-cse")
332 opt_D_dump_worker_wrapper = opt_D_dump_most || lookUp SLIT("-ddump-workwrap")
333 opt_D_show_passes = opt_D_dump_most || lookUp SLIT("-dshow-passes")
334 opt_D_dump_rn_trace = opt_D_dump_all || lookUp SLIT("-ddump-rn-trace")
335 opt_D_dump_rn_stats = opt_D_dump_most || lookUp SLIT("-ddump-rn-stats")
336 opt_D_dump_stix = opt_D_dump_all || lookUp SLIT("-ddump-stix")
337 opt_D_dump_simpl_stats = opt_D_dump_most || lookUp SLIT("-ddump-simpl-stats")
338 opt_D_source_stats = opt_D_dump_most || lookUp SLIT("-dsource-stats")
339 opt_D_verbose_core2core = opt_D_dump_all || lookUp SLIT("-dverbose-simpl")
340 opt_D_verbose_stg2stg = opt_D_dump_all || lookUp SLIT("-dverbose-stg")
341 opt_D_dump_minimal_imports = lookUp SLIT("-ddump-minimal-imports")
343 opt_DoCoreLinting = lookUp SLIT("-dcore-lint")
344 opt_DoStgLinting = lookUp SLIT("-dstg-lint")
345 opt_DoUSPLinting = lookUp SLIT("-dusagesp-lint")
346 opt_PprStyle_NoPrags = lookUp SLIT("-dppr-noprags")
347 opt_PprStyle_Debug = lookUp SLIT("-dppr-debug")
348 opt_PprUserLength = lookup_def_int "-dppr-user-length" 5 --ToDo: give this a name
351 opt_WarnDuplicateExports = lookUp SLIT("-fwarn-duplicate-exports")
352 opt_WarnHiShadows = lookUp SLIT("-fwarn-hi-shadowing")
353 opt_WarnIncompletePatterns = lookUp SLIT("-fwarn-incomplete-patterns")
354 opt_WarnMissingFields = lookUp SLIT("-fwarn-missing-fields")
355 opt_WarnMissingMethods = lookUp SLIT("-fwarn-missing-methods")
356 opt_WarnMissingSigs = lookUp SLIT("-fwarn-missing-signatures")
357 opt_WarnNameShadowing = lookUp SLIT("-fwarn-name-shadowing")
358 opt_WarnOverlappingPatterns = lookUp SLIT("-fwarn-overlapping-patterns")
359 opt_WarnSimplePatterns = lookUp SLIT("-fwarn-simple-patterns")
360 opt_WarnTypeDefaults = lookUp SLIT("-fwarn-type-defaults")
361 opt_WarnUnusedBinds = lookUp SLIT("-fwarn-unused-binds")
362 opt_WarnUnusedImports = lookUp SLIT("-fwarn-unused-imports")
363 opt_WarnUnusedMatches = lookUp SLIT("-fwarn-unused-matches")
364 opt_WarnDeprecations = lookUp SLIT("-fwarn-deprecations")
367 opt_AutoSccsOnAllToplevs = lookUp SLIT("-fauto-sccs-on-all-toplevs")
368 opt_AutoSccsOnExportedToplevs = lookUp SLIT("-fauto-sccs-on-exported-toplevs")
369 opt_AutoSccsOnIndividualCafs = lookUp SLIT("-fauto-sccs-on-individual-cafs")
370 opt_AutoSccsOnDicts = lookUp SLIT("-fauto-sccs-on-dicts")
371 opt_SccProfilingOn = lookUp SLIT("-fscc-profiling")
372 opt_DoTickyProfiling = lookUp SLIT("-fticky-ticky")
375 opt_AllStrict = lookUp SLIT("-fall-strict")
376 opt_DictsStrict = lookUp SLIT("-fdicts-strict")
377 opt_AllowOverlappingInstances = lookUp SLIT("-fallow-overlapping-instances")
378 opt_AllowUndecidableInstances = lookUp SLIT("-fallow-undecidable-instances")
379 opt_GlasgowExts = lookUp SLIT("-fglasgow-exts")
380 opt_IrrefutableTuples = lookUp SLIT("-firrefutable-tuples")
381 opt_MaxContextReductionDepth = lookup_def_int "-fcontext-stack" mAX_CONTEXT_REDUCTION_DEPTH
382 opt_NumbersStrict = lookUp SLIT("-fnumbers-strict")
383 opt_Parallel = lookUp SLIT("-fparallel")
384 opt_SMP = lookUp SLIT("-fsmp")
387 opt_DoEtaReduction = lookUp SLIT("-fdo-eta-reduction")
388 opt_DoSemiTagging = lookUp SLIT("-fsemi-tagging")
389 opt_FoldrBuildOn = lookUp SLIT("-ffoldr-build-on")
390 opt_LiberateCaseThreshold = lookup_def_int "-fliberate-case-threshold" (10::Int)
391 opt_StgDoLetNoEscapes = lookUp SLIT("-flet-no-escape")
392 opt_UnfoldCasms = lookUp SLIT("-funfold-casms-in-hi-file")
393 opt_UsageSPOn = lookUp SLIT("-fusagesp-on")
394 opt_UnboxStrictFields = lookUp SLIT("-funbox-strict-fields")
397 The optional '-inpackage=P' flag tells what package
398 we are compiling this module for.
399 The Prelude, for example is compiled with '-package prelude'
401 opt_InPackage = case lookup_str "-inpackage=" of
403 Nothing -> SLIT("Main") -- The package name if none is specified
405 opt_EmitCExternDecls = lookUp SLIT("-femit-extern-decls")
406 opt_EnsureSplittableC = lookUp SLIT("-fglobalise-toplev-names")
407 opt_GranMacros = lookUp SLIT("-fgransim")
408 opt_HiMap = lookup_str "-himap=" -- file saying where to look for .hi files
409 opt_HiMapSep = lookup_def_char "-himap-sep=" ':'
410 opt_HiVersion = lookup_def_int "-fhi-version=" 0 -- what version we're compiling.
411 opt_HistorySize = lookup_def_int "-fhistory-size" 20
412 opt_IgnoreAsserts = lookUp SLIT("-fignore-asserts")
413 opt_IgnoreIfacePragmas = lookUp SLIT("-fignore-interface-pragmas")
414 opt_NoHiCheck = lookUp SLIT("-fno-hi-version-check")
415 opt_NoImplicitPrelude = lookUp SLIT("-fno-implicit-prelude")
416 opt_OmitBlackHoling = lookUp SLIT("-dno-black-holing")
417 opt_OmitInterfacePragmas = lookUp SLIT("-fomit-interface-pragmas")
418 opt_ProduceExportCStubs = lookup_str "-F="
419 opt_ProduceExportHStubs = lookup_str "-FH="
420 opt_ProduceHi = lookup_str "-hifile=" -- the one to produce this time
422 -- Language for output: "C", "asm", "java", maybe more
423 -- Nothing => don't output anything
424 opt_OutputLanguage :: Maybe String
425 opt_OutputLanguage = lookup_str "-olang="
427 opt_OutputFile :: String
428 opt_OutputFile = case lookup_str "-ofile=" of
429 Nothing -> panic "No output file specified (-ofile=xxx)"
432 -- Simplifier switches
433 opt_SimplNoPreInlining = lookUp SLIT("-fno-pre-inlining")
434 -- NoPreInlining is there just to see how bad things
435 -- get if you don't do it!
436 opt_SimplDoEtaReduction = lookUp SLIT("-fdo-eta-reduction")
437 opt_SimplDoLambdaEtaExpansion = lookUp SLIT("-fdo-lambda-eta-expansion")
438 opt_SimplCaseOfCase = lookUp SLIT("-fcase-of-case")
439 opt_SimplCaseMerge = lookUp SLIT("-fcase-merge")
440 opt_SimplPedanticBottoms = lookUp SLIT("-fpedantic-bottoms")
443 opt_UF_HiFileThreshold = lookup_def_int "-funfolding-interface-threshold" (45::Int)
444 opt_UF_CreationThreshold = lookup_def_int "-funfolding-creation-threshold" (45::Int)
445 opt_UF_UseThreshold = lookup_def_int "-funfolding-use-threshold" (8::Int) -- Discounts can be big
446 opt_UF_ScrutConDiscount = lookup_def_int "-funfolding-con-discount" (2::Int)
447 opt_UF_FunAppDiscount = lookup_def_int "-funfolding-fun-discount" (6::Int) -- It's great to inline a fn
448 opt_UF_PrimArgDiscount = lookup_def_int "-funfolding-prim-discount" (1::Int)
449 opt_UF_KeenessFactor = lookup_def_float "-funfolding-keeness-factor" (1.5::Float)
451 opt_UF_CheapOp = ( 1 :: Int) -- Only one instruction; and the args are charged for
452 opt_UF_DearOp = ( 4 :: Int)
454 opt_ReportCompile = lookUp SLIT("-freport-compile")
455 opt_NoPruneDecls = lookUp SLIT("-fno-prune-decls")
456 opt_SourceUnchanged = lookUp SLIT("-fsource-unchanged")
457 opt_Static = lookUp SLIT("-static")
458 opt_Unregisterised = lookUp SLIT("-funregisterised")
459 opt_Verbose = lookUp SLIT("-v")
461 opt_UseVanillaRegs | opt_Unregisterised = 0
462 | otherwise = mAX_Real_Vanilla_REG
463 opt_UseFloatRegs | opt_Unregisterised = 0
464 | otherwise = mAX_Real_Float_REG
465 opt_UseDoubleRegs | opt_Unregisterised = 0
466 | otherwise = mAX_Real_Double_REG
467 opt_UseLongRegs | opt_Unregisterised = 0
468 | otherwise = mAX_Real_Long_REG
472 classifyOpts :: ([CoreToDo], -- Core-to-Core processing spec
473 [StgToDo]) -- STG-to-STG processing spec
475 classifyOpts = sep argv [] [] -- accumulators...
477 sep :: [FAST_STRING] -- cmd-line opts (input)
478 -> [CoreToDo] -> [StgToDo] -- to_do accumulators
479 -> ([CoreToDo], [StgToDo]) -- result
481 sep [] core_td stg_td -- all done!
482 = (reverse core_td, reverse stg_td)
484 # define CORE_TD(to_do) sep opts (to_do:core_td) stg_td
485 # define STG_TD(to_do) sep opts core_td (to_do:stg_td)
487 sep (opt1:opts) core_td stg_td
488 = case (_UNPK_ opt1) of -- the non-"just match a string" options are at the end...
489 ',' : _ -> sep opts core_td stg_td -- it is for the parser
491 "-fsimplify" -> -- gather up SimplifierSwitches specially...
492 simpl_sep opts defaultSimplSwitches core_td stg_td
494 "-ffloat-inwards" -> CORE_TD(CoreDoFloatInwards)
495 "-ffloat-outwards" -> CORE_TD(CoreDoFloatOutwards False)
496 "-ffloat-outwards-full" -> CORE_TD(CoreDoFloatOutwards True)
497 "-fliberate-case" -> CORE_TD(CoreLiberateCase)
498 "-fcse" -> CORE_TD(CoreCSE)
499 "-fprint-core" -> CORE_TD(CoreDoPrintCore)
500 "-fstatic-args" -> CORE_TD(CoreDoStaticArgs)
501 "-fstrictness" -> CORE_TD(CoreDoStrictness)
502 "-fworker-wrapper" -> CORE_TD(CoreDoWorkerWrapper)
503 "-fspecialise" -> CORE_TD(CoreDoSpecialising)
504 "-fusagesp" -> CORE_TD(CoreDoUSPInf)
505 "-fcpr-analyse" -> CORE_TD(CoreDoCPResult)
507 "-fstg-static-args" -> STG_TD(StgDoStaticArgs)
508 "-dstg-stats" -> STG_TD(D_stg_stats)
509 "-flambda-lift" -> STG_TD(StgDoLambdaLift)
510 "-fmassage-stg-for-profiling" -> STG_TD(StgDoMassageForProfiling)
512 _ -> -- NB: the driver is really supposed to handle bad options
513 sep opts core_td stg_td
517 simpl_sep :: [FAST_STRING] -- cmd-line opts (input)
518 -> [SimplifierSwitch] -- simplifier-switch accumulator
519 -> [CoreToDo] -> [StgToDo] -- to_do accumulators
520 -> ([CoreToDo], [StgToDo]) -- result
522 -- "simpl_sep" tailcalls "sep" once it's seen one set
523 -- of SimplifierSwitches for a CoreDoSimplify.
526 simpl_sep input@[] simpl_sw core_td stg_td
527 = panic "simpl_sep []"
530 -- The SimplifierSwitches should be delimited by "[" and "]".
532 simpl_sep (opt1:opts) simpl_sw core_td stg_td
533 = case (_UNPK_ opt1) of
534 "[" -> simpl_sep opts simpl_sw core_td stg_td
536 this_simpl = CoreDoSimplify (isAmongSimpl simpl_sw)
538 sep opts (this_simpl : core_td) stg_td
540 opt -> case matchSimplSw opt of
541 Just sw -> simpl_sep opts (sw:simpl_sw) core_td stg_td
542 Nothing -> simpl_sep opts simpl_sw core_td stg_td
545 = firstJust [ matchSwInt opt "-fmax-simplifier-iterations" MaxSimplifierIterations
546 , matchSwInt opt "-finline-phase" SimplInlinePhase
547 , matchSwBool opt "-fno-rules" DontApplyRules
548 , matchSwBool opt "-fno-case-of-case" NoCaseOfCase
549 , matchSwBool opt "-flet-to-case" SimplLetToCase
552 matchSwBool :: String -> String -> a -> Maybe a
553 matchSwBool opt str sw | opt == str = Just sw
554 | otherwise = Nothing
556 matchSwInt :: String -> String -> (Int -> a) -> Maybe a
557 matchSwInt opt str sw = case startsWith str opt of
558 Just opt_left -> Just (sw (read opt_left))
562 %************************************************************************
564 \subsection{Switch ordering}
566 %************************************************************************
568 In spite of the @Produce*@ constructor, these things behave just like
572 instance Eq SimplifierSwitch where
573 a == b = tagOf_SimplSwitch a _EQ_ tagOf_SimplSwitch b
575 instance Ord SimplifierSwitch where
576 a < b = tagOf_SimplSwitch a _LT_ tagOf_SimplSwitch b
577 a <= b = tagOf_SimplSwitch a _LE_ tagOf_SimplSwitch b
580 tagOf_SimplSwitch (SimplInlinePhase _) = ILIT(1)
581 tagOf_SimplSwitch (MaxSimplifierIterations _) = ILIT(2)
582 tagOf_SimplSwitch DontApplyRules = ILIT(3)
583 tagOf_SimplSwitch SimplLetToCase = ILIT(4)
584 tagOf_SimplSwitch NoCaseOfCase = ILIT(5)
586 -- If you add anything here, be sure to change lAST_SIMPL_SWITCH_TAG, too!
588 lAST_SIMPL_SWITCH_TAG = 5
591 %************************************************************************
593 \subsection{Switch lookup}
595 %************************************************************************
598 isAmongSimpl :: [SimplifierSwitch] -> SimplifierSwitch -> SwitchResult
600 isAmongSimpl on_switches -- Switches mentioned later occur *earlier*
601 -- in the list; defaults right at the end.
603 tidied_on_switches = foldl rm_dups [] on_switches
604 -- The fold*l* ensures that we keep the latest switches;
605 -- ie the ones that occur earliest in the list.
607 sw_tbl :: Array Int SwitchResult
608 sw_tbl = (array (0, lAST_SIMPL_SWITCH_TAG) -- bounds...
612 all_undefined = [ (i, SwBool False) | i <- [0 .. lAST_SIMPL_SWITCH_TAG ] ]
614 defined_elems = map mk_assoc_elem tidied_on_switches
616 -- (avoid some unboxing, bounds checking, and other horrible things:)
617 #if __GLASGOW_HASKELL__ < 405
618 case sw_tbl of { Array bounds_who_needs_'em stuff ->
620 case sw_tbl of { Array _ _ stuff ->
623 case (indexArray# stuff (tagOf_SimplSwitch switch)) of
624 #if __GLASGOW_HASKELL__ < 400
626 #elif __GLASGOW_HASKELL__ < 403
633 mk_assoc_elem k@(MaxSimplifierIterations lvl) = (IBOX(tagOf_SimplSwitch k), SwInt lvl)
634 mk_assoc_elem k@(SimplInlinePhase n) = (IBOX(tagOf_SimplSwitch k), SwInt n)
635 mk_assoc_elem k = (IBOX(tagOf_SimplSwitch k), SwBool True) -- I'm here, Mom!
637 -- cannot have duplicates if we are going to use the array thing
638 rm_dups switches_so_far switch
639 = if switch `is_elem` switches_so_far
641 else switch : switches_so_far
643 sw `is_elem` [] = False
644 sw `is_elem` (s:ss) = (tagOf_SimplSwitch sw) _EQ_ (tagOf_SimplSwitch s)
648 Default settings for simplifier switches
651 defaultSimplSwitches = [MaxSimplifierIterations 1]
654 %************************************************************************
656 \subsection{Misc functions for command-line options}
658 %************************************************************************
662 switchIsOn :: (switch -> SwitchResult) -> switch -> Bool
664 switchIsOn lookup_fn switch
665 = case (lookup_fn switch) of
666 SwBool False -> False
669 intSwitchSet :: (switch -> SwitchResult)
673 intSwitchSet lookup_fn switch
674 = case (lookup_fn (switch (panic "intSwitchSet"))) of
675 SwInt int -> Just int
680 startsWith :: String -> String -> Maybe String
681 -- startsWith pfx (pfx++rest) = Just rest
683 startsWith [] str = Just str
684 startsWith (c:cs) (s:ss)
685 = if c /= s then Nothing else startsWith cs ss
686 startsWith _ [] = Nothing
688 endsWith :: String -> String -> Maybe String
690 = case (startsWith (reverse cs) (reverse ss)) of
692 Just rs -> Just (reverse rs)