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,
160 #include "HsVersions.h"
162 import Array ( array, (//) )
165 import Constants -- Default values for some flags
167 import FastString ( headFS )
168 import Maybes ( assocMaybe, firstJust, maybeToBool )
169 import Panic ( panic, panic# )
171 #if __GLASGOW_HASKELL__ < 301
172 import ArrBase ( Array(..) )
174 import PrelArr ( Array(..) )
178 A command-line {\em switch} is (generally) either on or off; e.g., the
179 ``verbose'' (-v) switch is either on or off.
181 A list of {\em ToDo}s is things to be done in a particular part of
182 processing. A (fictitious) example for the Core-to-Core simplifier
183 might be: run the simplifier, then run the strictness analyser, then
184 run the simplifier again (three ``todos'').
186 There are three ``to-do processing centers'' at the moment. In the
187 main loop (\tr{main/Main.lhs}), in the Core-to-Core processing loop
188 (\tr{simplCore/SimplCore.lhs), and in the STG-to-STG processing loop
189 (\tr{simplStg/SimplStg.lhs}).
192 %************************************************************************
194 \subsection{Datatypes associated with command-line options}
196 %************************************************************************
200 = SwBool Bool -- on/off
201 | SwString FAST_STRING -- nothing or a String
202 | SwInt Int -- nothing or an Int
206 data CoreToDo -- These are diff core-to-core passes,
207 -- which may be invoked in any order,
208 -- as many times as you like.
210 = CoreDoSimplify -- The core-to-core simplifier.
211 (SimplifierSwitch -> SwitchResult)
212 -- Each run of the simplifier can take a different
213 -- set of simplifier-specific flags.
215 | CoreDoFloatOutwards Bool -- True <=> float lambdas to top level
220 | CoreDoWorkerWrapper
231 | StgDoMassageForProfiling -- should be (next to) last
232 -- There's also setStgVarInfo, but its absolute "lastness"
233 -- is so critical that it is hardwired in (no flag).
238 data SimplifierSwitch
239 = MaxSimplifierIterations Int
240 | SimplInlinePhase Int
246 %************************************************************************
248 \subsection{Classifying command-line options}
250 %************************************************************************
253 lookUp :: FAST_STRING -> Bool
254 lookup_int :: String -> Maybe Int
255 lookup_def_int :: String -> Int -> Int
256 lookup_def_float :: String -> Float -> Float
257 lookup_str :: String -> Maybe String
259 lookUp sw = maybeToBool (assoc_opts sw)
261 lookup_str sw = firstJust (map (startsWith sw) unpacked_opts)
263 lookup_int sw = case (lookup_str sw) of
265 Just xx -> Just (read xx)
267 lookup_def_int sw def = case (lookup_str sw) of
268 Nothing -> def -- Use default
271 lookup_def_char sw def = case (lookup_str sw) of
273 _ -> def -- Use default
275 lookup_def_float sw def = case (lookup_str sw) of
276 Nothing -> def -- Use default
279 assoc_opts = assocMaybe [ (a, True) | a <- argv ]
280 unpacked_opts = map _UNPK_ argv
283 Putting the compiler options into temporary at-files
284 may turn out to be necessary later on if we turn hsc into
285 a pure Win32 application where I think there's a command-line
286 length limit of 255. unpacked_opts understands the @ option.
288 assoc_opts = assocMaybe [ (_PK_ a, True) | a <- unpacked_opts ]
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_minimal_imports = lookUp SLIT("-ddump-minimal-imports")
346 opt_DoCoreLinting = lookUp SLIT("-dcore-lint")
347 opt_DoStgLinting = lookUp SLIT("-dstg-lint")
348 opt_DoUSPLinting = lookUp SLIT("-dusagesp-lint")
349 opt_PprStyle_NoPrags = lookUp SLIT("-dppr-noprags")
350 opt_PprStyle_Debug = lookUp SLIT("-dppr-debug")
351 opt_PprUserLength = lookup_def_int "-dppr-user-length" 5 --ToDo: give this a name
354 opt_WarnDuplicateExports = lookUp SLIT("-fwarn-duplicate-exports")
355 opt_WarnHiShadows = lookUp SLIT("-fwarn-hi-shadowing")
356 opt_WarnIncompletePatterns = lookUp SLIT("-fwarn-incomplete-patterns")
357 opt_WarnMissingFields = lookUp SLIT("-fwarn-missing-fields")
358 opt_WarnMissingMethods = lookUp SLIT("-fwarn-missing-methods")
359 opt_WarnMissingSigs = lookUp SLIT("-fwarn-missing-signatures")
360 opt_WarnNameShadowing = lookUp SLIT("-fwarn-name-shadowing")
361 opt_WarnOverlappingPatterns = lookUp SLIT("-fwarn-overlapping-patterns")
362 opt_WarnSimplePatterns = lookUp SLIT("-fwarn-simple-patterns")
363 opt_WarnTypeDefaults = lookUp SLIT("-fwarn-type-defaults")
364 opt_WarnUnusedBinds = lookUp SLIT("-fwarn-unused-binds")
365 opt_WarnUnusedImports = lookUp SLIT("-fwarn-unused-imports")
366 opt_WarnUnusedMatches = lookUp SLIT("-fwarn-unused-matches")
367 opt_WarnDeprecations = lookUp SLIT("-fwarn-deprecations")
370 opt_AutoSccsOnAllToplevs = lookUp SLIT("-fauto-sccs-on-all-toplevs")
371 opt_AutoSccsOnExportedToplevs = lookUp SLIT("-fauto-sccs-on-exported-toplevs")
372 opt_AutoSccsOnIndividualCafs = lookUp SLIT("-fauto-sccs-on-individual-cafs")
373 opt_AutoSccsOnDicts = lookUp SLIT("-fauto-sccs-on-dicts")
374 opt_SccProfilingOn = lookUp SLIT("-fscc-profiling")
375 opt_DoTickyProfiling = lookUp SLIT("-fticky-ticky")
378 opt_AllStrict = lookUp SLIT("-fall-strict")
379 opt_DictsStrict = lookUp SLIT("-fdicts-strict")
380 opt_AllowOverlappingInstances = lookUp SLIT("-fallow-overlapping-instances")
381 opt_AllowUndecidableInstances = lookUp SLIT("-fallow-undecidable-instances")
382 opt_GlasgowExts = lookUp SLIT("-fglasgow-exts")
383 opt_IrrefutableTuples = lookUp SLIT("-firrefutable-tuples")
384 opt_MaxContextReductionDepth = lookup_def_int "-fcontext-stack" mAX_CONTEXT_REDUCTION_DEPTH
385 opt_NumbersStrict = lookUp SLIT("-fnumbers-strict")
386 opt_Parallel = lookUp SLIT("-fparallel")
387 opt_SMP = lookUp SLIT("-fsmp")
390 opt_DoEtaReduction = lookUp SLIT("-fdo-eta-reduction")
391 opt_DoSemiTagging = lookUp SLIT("-fsemi-tagging")
392 opt_FoldrBuildOn = lookUp SLIT("-ffoldr-build-on")
393 opt_LiberateCaseThreshold = lookup_def_int "-fliberate-case-threshold" (10::Int)
394 opt_StgDoLetNoEscapes = lookUp SLIT("-flet-no-escape")
395 opt_UnfoldCasms = lookUp SLIT("-funfold-casms-in-hi-file")
396 opt_UsageSPOn = lookUp SLIT("-fusagesp-on")
397 opt_UnboxStrictFields = lookUp SLIT("-funbox-strict-fields")
400 The optional '-inpackage=P' flag tells what package
401 we are compiling this module for.
402 The Prelude, for example is compiled with '-package prelude'
404 opt_InPackage = case lookup_str "-inpackage=" of
406 Nothing -> SLIT("Main") -- The package name if none is specified
408 opt_EmitCExternDecls = lookUp SLIT("-femit-extern-decls")
409 opt_EnsureSplittableC = lookUp SLIT("-fglobalise-toplev-names")
410 opt_GranMacros = lookUp SLIT("-fgransim")
411 opt_HiMap = lookup_str "-himap=" -- file saying where to look for .hi files
412 opt_HiMapSep = lookup_def_char "-himap-sep=" ':'
413 opt_HiVersion = lookup_def_int "-fhi-version=" 0 -- what version we're compiling.
414 opt_HistorySize = lookup_def_int "-fhistory-size" 20
415 opt_IgnoreAsserts = lookUp SLIT("-fignore-asserts")
416 opt_IgnoreIfacePragmas = lookUp SLIT("-fignore-interface-pragmas")
417 opt_NoHiCheck = lookUp SLIT("-fno-hi-version-check")
418 opt_NoImplicitPrelude = lookUp SLIT("-fno-implicit-prelude")
419 opt_OmitBlackHoling = lookUp SLIT("-dno-black-holing")
420 opt_OmitInterfacePragmas = lookUp SLIT("-fomit-interface-pragmas")
421 opt_ProduceExportCStubs = lookup_str "-F="
422 opt_ProduceExportHStubs = lookup_str "-FH="
424 -- where to generate the .hi file
425 opt_HiFile = lookup_str "-hifile="
426 opt_HiDir = lookup_str "-hidir="
427 opt_HiSuf = lookup_str "-hisuf="
429 -- Language for output: "C", "asm", "java", maybe more
430 -- Nothing => don't output anything
431 opt_OutputLanguage :: Maybe String
432 opt_OutputLanguage = lookup_str "-olang="
434 opt_OutputFile :: String
435 opt_OutputFile = case lookup_str "-ofile=" of
436 Nothing -> panic "No output file specified (-ofile=xxx)"
439 -- Simplifier switches
440 opt_SimplNoPreInlining = lookUp SLIT("-fno-pre-inlining")
441 -- NoPreInlining is there just to see how bad things
442 -- get if you don't do it!
443 opt_SimplDoEtaReduction = lookUp SLIT("-fdo-eta-reduction")
444 opt_SimplDoLambdaEtaExpansion = lookUp SLIT("-fdo-lambda-eta-expansion")
445 opt_SimplCaseOfCase = lookUp SLIT("-fcase-of-case")
446 opt_SimplCaseMerge = lookUp SLIT("-fcase-merge")
447 opt_SimplPedanticBottoms = lookUp SLIT("-fpedantic-bottoms")
450 opt_UF_HiFileThreshold = lookup_def_int "-funfolding-interface-threshold" (45::Int)
451 opt_UF_CreationThreshold = lookup_def_int "-funfolding-creation-threshold" (45::Int)
452 opt_UF_UseThreshold = lookup_def_int "-funfolding-use-threshold" (8::Int) -- Discounts can be big
453 opt_UF_ScrutConDiscount = lookup_def_int "-funfolding-con-discount" (2::Int)
454 opt_UF_FunAppDiscount = lookup_def_int "-funfolding-fun-discount" (6::Int) -- It's great to inline a fn
455 opt_UF_PrimArgDiscount = lookup_def_int "-funfolding-prim-discount" (1::Int)
456 opt_UF_KeenessFactor = lookup_def_float "-funfolding-keeness-factor" (1.5::Float)
458 opt_UF_CheapOp = ( 1 :: Int) -- Only one instruction; and the args are charged for
459 opt_UF_DearOp = ( 4 :: Int)
461 opt_ReportCompile = lookUp SLIT("-freport-compile")
462 opt_NoPruneDecls = lookUp SLIT("-fno-prune-decls")
463 opt_NoPruneTyDecls = lookUp SLIT("-fno-prune-tydecls")
464 opt_SourceUnchanged = lookUp SLIT("-fsource-unchanged")
465 opt_Static = lookUp SLIT("-static")
466 opt_Unregisterised = lookUp SLIT("-funregisterised")
467 opt_Verbose = lookUp SLIT("-v")
469 opt_UseVanillaRegs | opt_Unregisterised = 0
470 | otherwise = mAX_Real_Vanilla_REG
471 opt_UseFloatRegs | opt_Unregisterised = 0
472 | otherwise = mAX_Real_Float_REG
473 opt_UseDoubleRegs | opt_Unregisterised = 0
474 | otherwise = mAX_Real_Double_REG
475 opt_UseLongRegs | opt_Unregisterised = 0
476 | otherwise = mAX_Real_Long_REG
480 classifyOpts :: ([CoreToDo], -- Core-to-Core processing spec
481 [StgToDo]) -- STG-to-STG processing spec
483 classifyOpts = sep argv [] [] -- accumulators...
485 sep :: [FAST_STRING] -- cmd-line opts (input)
486 -> [CoreToDo] -> [StgToDo] -- to_do accumulators
487 -> ([CoreToDo], [StgToDo]) -- result
489 sep [] core_td stg_td -- all done!
490 = (reverse core_td, reverse stg_td)
492 # define CORE_TD(to_do) sep opts (to_do:core_td) stg_td
493 # define STG_TD(to_do) sep opts core_td (to_do:stg_td)
495 sep (opt1:opts) core_td stg_td
496 = case (_UNPK_ opt1) of -- the non-"just match a string" options are at the end...
497 ',' : _ -> sep opts core_td stg_td -- it is for the parser
499 "-fsimplify" -> -- gather up SimplifierSwitches specially...
500 simpl_sep opts defaultSimplSwitches core_td stg_td
502 "-ffloat-inwards" -> CORE_TD(CoreDoFloatInwards)
503 "-ffloat-outwards" -> CORE_TD(CoreDoFloatOutwards False)
504 "-ffloat-outwards-full" -> CORE_TD(CoreDoFloatOutwards True)
505 "-fliberate-case" -> CORE_TD(CoreLiberateCase)
506 "-fcse" -> CORE_TD(CoreCSE)
507 "-fprint-core" -> CORE_TD(CoreDoPrintCore)
508 "-fstatic-args" -> CORE_TD(CoreDoStaticArgs)
509 "-fstrictness" -> CORE_TD(CoreDoStrictness)
510 "-fworker-wrapper" -> CORE_TD(CoreDoWorkerWrapper)
511 "-fspecialise" -> CORE_TD(CoreDoSpecialising)
512 "-fusagesp" -> CORE_TD(CoreDoUSPInf)
513 "-fcpr-analyse" -> CORE_TD(CoreDoCPResult)
515 "-fstg-static-args" -> STG_TD(StgDoStaticArgs)
516 "-dstg-stats" -> STG_TD(D_stg_stats)
517 "-flambda-lift" -> STG_TD(StgDoLambdaLift)
518 "-fmassage-stg-for-profiling" -> STG_TD(StgDoMassageForProfiling)
520 _ -> -- NB: the driver is really supposed to handle bad options
521 sep opts core_td stg_td
525 simpl_sep :: [FAST_STRING] -- cmd-line opts (input)
526 -> [SimplifierSwitch] -- simplifier-switch accumulator
527 -> [CoreToDo] -> [StgToDo] -- to_do accumulators
528 -> ([CoreToDo], [StgToDo]) -- result
530 -- "simpl_sep" tailcalls "sep" once it's seen one set
531 -- of SimplifierSwitches for a CoreDoSimplify.
534 simpl_sep input@[] simpl_sw core_td stg_td
535 = panic "simpl_sep []"
538 -- The SimplifierSwitches should be delimited by "[" and "]".
540 simpl_sep (opt1:opts) simpl_sw core_td stg_td
541 = case (_UNPK_ opt1) of
542 "[" -> simpl_sep opts simpl_sw core_td stg_td
544 this_simpl = CoreDoSimplify (isAmongSimpl simpl_sw)
546 sep opts (this_simpl : core_td) stg_td
548 opt -> case matchSimplSw opt of
549 Just sw -> simpl_sep opts (sw:simpl_sw) core_td stg_td
550 Nothing -> simpl_sep opts simpl_sw core_td stg_td
553 = firstJust [ matchSwInt opt "-fmax-simplifier-iterations" MaxSimplifierIterations
554 , matchSwInt opt "-finline-phase" SimplInlinePhase
555 , matchSwBool opt "-fno-rules" DontApplyRules
556 , matchSwBool opt "-fno-case-of-case" NoCaseOfCase
557 , matchSwBool opt "-flet-to-case" SimplLetToCase
560 matchSwBool :: String -> String -> a -> Maybe a
561 matchSwBool opt str sw | opt == str = Just sw
562 | otherwise = Nothing
564 matchSwInt :: String -> String -> (Int -> a) -> Maybe a
565 matchSwInt opt str sw = case startsWith str opt of
566 Just opt_left -> Just (sw (read opt_left))
570 %************************************************************************
572 \subsection{Switch ordering}
574 %************************************************************************
576 In spite of the @Produce*@ constructor, these things behave just like
580 instance Eq SimplifierSwitch where
581 a == b = tagOf_SimplSwitch a _EQ_ tagOf_SimplSwitch b
583 instance Ord SimplifierSwitch where
584 a < b = tagOf_SimplSwitch a _LT_ tagOf_SimplSwitch b
585 a <= b = tagOf_SimplSwitch a _LE_ tagOf_SimplSwitch b
588 tagOf_SimplSwitch (SimplInlinePhase _) = ILIT(1)
589 tagOf_SimplSwitch (MaxSimplifierIterations _) = ILIT(2)
590 tagOf_SimplSwitch DontApplyRules = ILIT(3)
591 tagOf_SimplSwitch SimplLetToCase = ILIT(4)
592 tagOf_SimplSwitch NoCaseOfCase = ILIT(5)
594 -- If you add anything here, be sure to change lAST_SIMPL_SWITCH_TAG, too!
596 lAST_SIMPL_SWITCH_TAG = 5
599 %************************************************************************
601 \subsection{Switch lookup}
603 %************************************************************************
606 isAmongSimpl :: [SimplifierSwitch] -> SimplifierSwitch -> SwitchResult
608 isAmongSimpl on_switches -- Switches mentioned later occur *earlier*
609 -- in the list; defaults right at the end.
611 tidied_on_switches = foldl rm_dups [] on_switches
612 -- The fold*l* ensures that we keep the latest switches;
613 -- ie the ones that occur earliest in the list.
615 sw_tbl :: Array Int SwitchResult
616 sw_tbl = (array (0, lAST_SIMPL_SWITCH_TAG) -- bounds...
620 all_undefined = [ (i, SwBool False) | i <- [0 .. lAST_SIMPL_SWITCH_TAG ] ]
622 defined_elems = map mk_assoc_elem tidied_on_switches
624 -- (avoid some unboxing, bounds checking, and other horrible things:)
625 #if __GLASGOW_HASKELL__ < 405
626 case sw_tbl of { Array bounds_who_needs_'em stuff ->
628 case sw_tbl of { Array _ _ stuff ->
631 case (indexArray# stuff (tagOf_SimplSwitch switch)) of
632 #if __GLASGOW_HASKELL__ < 400
634 #elif __GLASGOW_HASKELL__ < 403
641 mk_assoc_elem k@(MaxSimplifierIterations lvl) = (IBOX(tagOf_SimplSwitch k), SwInt lvl)
642 mk_assoc_elem k@(SimplInlinePhase n) = (IBOX(tagOf_SimplSwitch k), SwInt n)
643 mk_assoc_elem k = (IBOX(tagOf_SimplSwitch k), SwBool True) -- I'm here, Mom!
645 -- cannot have duplicates if we are going to use the array thing
646 rm_dups switches_so_far switch
647 = if switch `is_elem` switches_so_far
649 else switch : switches_so_far
651 sw `is_elem` [] = False
652 sw `is_elem` (s:ss) = (tagOf_SimplSwitch sw) _EQ_ (tagOf_SimplSwitch s)
656 Default settings for simplifier switches
659 defaultSimplSwitches = [MaxSimplifierIterations 1]
662 %************************************************************************
664 \subsection{Misc functions for command-line options}
666 %************************************************************************
670 switchIsOn :: (switch -> SwitchResult) -> switch -> Bool
672 switchIsOn lookup_fn switch
673 = case (lookup_fn switch) of
674 SwBool False -> False
677 intSwitchSet :: (switch -> SwitchResult)
681 intSwitchSet lookup_fn switch
682 = case (lookup_fn (switch (panic "intSwitchSet"))) of
683 SwInt int -> Just int
688 startsWith :: String -> String -> Maybe String
689 -- startsWith pfx (pfx++rest) = Just rest
691 startsWith [] str = Just str
692 startsWith (c:cs) (s:ss)
693 = if c /= s then Nothing else startsWith cs ss
694 startsWith _ [] = Nothing
696 endsWith :: String -> String -> Maybe String
698 = case (startsWith (reverse cs) (reverse ss)) of
700 Just rs -> Just (reverse rs)