ghc/compiler/main/CmdLineOpts.lhs

   1 %
   2 % (c) The AQUA Project, Glasgow University, 1996
   3 %
   4 \section[CmdLineOpts]{Things to do with command-line options}
   5
   6 \begin{code}
   7 module CmdLineOpts (
   8         CoreToDo(..),
   9         SimplifierSwitch(..),
  10         StgToDo(..),
  11         SwitchResult(..),
  12         classifyOpts,
  13
  14         intSwitchSet,
  15         switchIsOn,
  16
  17         maybe_CompilingGhcInternals,
  18         opt_AllStrict,
  19         opt_AllowOverlappingInstances,
  20         opt_AutoSccsOnAllToplevs,
  21         opt_AutoSccsOnExportedToplevs,
  22         opt_AutoSccsOnIndividualCafs,
  23         opt_CompilingGhcInternals,
  24         opt_D_dump_absC,
  25         opt_D_dump_asm,
  26         opt_D_dump_deriv,
  27         opt_D_dump_ds,
  28         opt_D_dump_flatC,
  29         opt_D_dump_occur_anal,
  30         opt_D_dump_rdr,
  31         opt_D_dump_realC,
  32         opt_D_dump_rn,
  33         opt_D_dump_simpl,
  34         opt_D_dump_simpl_iterations,
  35         opt_D_dump_spec,
  36         opt_D_dump_stg,
  37         opt_D_dump_stranal,
  38         opt_D_dump_tc,
  39         opt_D_show_passes,
  40         opt_D_show_rn_trace,
  41         opt_D_show_rn_imports,
  42         opt_D_simplifier_stats,
  43         opt_D_source_stats,
  44         opt_D_verbose_core2core,
  45         opt_D_verbose_stg2stg,
  46         opt_DoCoreLinting,
  47         opt_DoStgLinting,
  48         opt_DoSemiTagging,
  49         opt_DoEtaReduction,
  50         opt_DoTickyProfiling,
  51         opt_EnsureSplittableC,
  52         opt_FoldrBuildOn,
  53         opt_ForConcurrent,
  54         opt_GlasgowExts,
  55         opt_GranMacros,
  56         opt_HiMap,
  57         opt_IgnoreIfacePragmas,
  58         opt_IrrefutableTuples,
  59         opt_LiberateCaseThreshold,
  60         opt_MultiParamClasses,
  61         opt_NoImplicitPrelude,
  62         opt_NumbersStrict,
  63         opt_OmitBlackHoling,
  64         opt_OmitInterfacePragmas,
  65         opt_PprStyle_All,
  66         opt_PprStyle_Debug,
  67         opt_PprStyle_User,              -- ToDo: rm
  68         opt_PprUserLength,
  69         opt_ProduceC,
  70         opt_ProduceHi,
  71         opt_ProduceS,
  72         opt_ReportWhyUnfoldingsDisallowed,
  73         opt_ReturnInRegsThreshold,
  74         opt_SccGroup,
  75         opt_SccProfilingOn,
  76         opt_ShowImportSpecs,
  77         opt_SigsRequired,
  78         opt_SourceUnchanged,
  79         opt_SpecialiseAll,
  80         opt_SpecialiseImports,
  81         opt_SpecialiseOverloaded,
  82         opt_SpecialiseTrace,
  83         opt_SpecialiseUnboxed,
  84         opt_StgDoLetNoEscapes,
  85
  86         opt_InterfaceUnfoldThreshold,
  87         opt_UnfoldingCreationThreshold,
  88         opt_UnfoldingConDiscount,
  89         opt_UnfoldingUseThreshold,
  90         opt_UnfoldingKeenessFactor,
  91
  92         opt_Verbose,
  93         opt_WarnNameShadowing,
  94         opt_WarnUnusedMatches,
  95         opt_WarnUnusedBinds,
  96         opt_WarnUnusedImports,
  97         opt_WarnIncompletePatterns,
  98         opt_WarnOverlappingPatterns,
  99         opt_WarnSimplePatterns,
 100         opt_WarnMissingMethods,
 101         opt_WarnDuplicateExports,
 102         opt_WarnHiShadows,
 103         opt_PruneTyDecls, opt_PruneInstDecls,
 104         opt_D_show_rn_stats
 105     ) where
 106
 107 #include "HsVersions.h"
 108
 109 import Array    ( array, (//) )
 110 import GlaExts
 111 import Argv
 112 import Constants        -- Default values for some flags
 113
 114 import Maybes           ( assocMaybe, firstJust, maybeToBool )
 115 import Util             ( startsWith, panic, panic# )
 116
 117 #if __GLASGOW_HASKELL__ < 301
 118 import ArrBase  ( Array(..) )
 119 #else
 120 import PrelArr  ( Array(..) )
 121 #endif
 122 \end{code}
 123
 124 A command-line {\em switch} is (generally) either on or off; e.g., the
 125 ``verbose'' (-v) switch is either on or off.  (The \tr{-G<group>}
 126 switch is an exception; it's set to a string, or nothing.)
 127
 128 A list of {\em ToDo}s is things to be done in a particular part of
 129 processing.  A (fictitious) example for the Core-to-Core simplifier
 130 might be: run the simplifier, then run the strictness analyser, then
 131 run the simplifier again (three ``todos'').
 132
 133 There are three ``to-do processing centers'' at the moment.  In the
 134 main loop (\tr{main/Main.lhs}), in the Core-to-Core processing loop
 135 (\tr{simplCore/SimplCore.lhs), and in the STG-to-STG processing loop
 136 (\tr{simplStg/SimplStg.lhs}).
 137
 138 %************************************************************************
 139 %*                                                                      *
 140 \subsection{Datatypes associated with command-line options}
 141 %*                                                                      *
 142 %************************************************************************
 143
 144 \begin{code}
 145 data SwitchResult
 146   = SwBool      Bool            -- on/off
 147   | SwString    FAST_STRING     -- nothing or a String
 148   | SwInt       Int             -- nothing or an Int
 149 \end{code}
 150
 151 \begin{code}
 152 data CoreToDo           -- These are diff core-to-core passes,
 153                         -- which may be invoked in any order,
 154                         -- as many times as you like.
 155
 156   = CoreDoSimplify      -- The core-to-core simplifier.
 157         (SimplifierSwitch -> SwitchResult)
 158                         -- Each run of the simplifier can take a different
 159                         -- set of simplifier-specific flags.
 160   | CoreDoCalcInlinings1
 161   | CoreDoCalcInlinings2
 162   | CoreDoFloatInwards
 163   | CoreDoFullLaziness
 164   | CoreLiberateCase
 165   | CoreDoPrintCore
 166   | CoreDoStaticArgs
 167   | CoreDoStrictness
 168   | CoreDoSpecialising
 169   | CoreDoFoldrBuildWorkerWrapper
 170   | CoreDoFoldrBuildWWAnal
 171 \end{code}
 172
 173 \begin{code}
 174 data StgToDo
 175   = StgDoStaticArgs
 176   | StgDoUpdateAnalysis
 177   | StgDoLambdaLift
 178   | StgDoMassageForProfiling  -- should be (next to) last
 179   -- There's also setStgVarInfo, but its absolute "lastness"
 180   -- is so critical that it is hardwired in (no flag).
 181   | D_stg_stats
 182 \end{code}
 183
 184 \begin{code}
 185 data SimplifierSwitch
 186   = SimplOkToDupCode
 187   | SimplFloatLetsExposingWHNF
 188   | SimplOkToFloatPrimOps
 189   | SimplAlwaysFloatLetsFromLets
 190   | SimplDoCaseElim
 191   | SimplReuseCon
 192   | SimplCaseOfCase
 193   | SimplLetToCase
 194   | SimplMayDeleteConjurableIds
 195   | SimplPedanticBottoms -- see Simplifier for an explanation
 196   | SimplDoArityExpand   -- expand arity of bindings
 197   | SimplDoFoldrBuild    -- This is the per-simplification flag;
 198                          -- see also FoldrBuildOn, used elsewhere
 199                          -- in the compiler.
 200   | SimplDoInlineFoldrBuild
 201                          -- inline foldr/build (*after* f/b rule is used)
 202
 203   | IgnoreINLINEPragma
 204   | SimplDoLambdaEtaExpansion
 205
 206   | EssentialUnfoldingsOnly -- never mind the thresholds, only
 207                             -- do unfoldings that *must* be done
 208                             -- (to saturate constructors and primitives)
 209
 210   | ShowSimplifierProgress  -- report counts on every interation
 211
 212   | MaxSimplifierIterations Int
 213
 214   | SimplNoLetFromCase      -- used when turning off floating entirely
 215   | SimplNoLetFromApp       -- (for experimentation only) WDP 95/10
 216   | SimplNoLetFromStrictLet
 217
 218   | SimplDontFoldBackAppend
 219                         -- we fold `foldr (:)' back into flip (++),
 220                         -- but we *don't* want to do it when compiling
 221                         -- List.hs, otherwise
 222                         -- xs ++ ys = foldr (:) ys xs
 223                         -- {- via our loopback -}
 224                         -- xs ++ ys = xs ++ ys
 225                         -- Oops!
 226                         -- So only use this flag inside List.hs
 227                         -- (Sigh, what a HACK, Andy.  WDP 96/01)
 228
 229   | SimplCaseMerge
 230   | SimplCaseScrutinee  -- This flag tells that the expression being simplified is
 231                         -- the scrutinee of a case expression, so we should
 232                         -- apply the scrutinee discount when considering inlinings.
 233                         -- See SimplVar.lhs
 234
 235   | SimplCloneBinds     -- This flag controls whether the simplifier should
 236                         -- always clone binder ids when creating expression
 237                         -- copies. The default is NO, but it needs to be turned on
 238                         -- prior to floating binders outwards.
 239                         -- (see comment inside SimplVar.simplBinder)
 240 \end{code}
 241
 242 %************************************************************************
 243 %*                                                                      *
 244 \subsection{Classifying command-line options}
 245 %*                                                                      *
 246 %************************************************************************
 247
 248 \begin{code}
 249 lookUp           :: FAST_STRING -> Bool
 250 lookup_int       :: String -> Maybe Int
 251 lookup_def_int   :: String -> Int -> Int
 252 lookup_def_float :: String -> Float -> Float
 253 lookup_str       :: String -> Maybe String
 254
 255 lookUp     sw = maybeToBool (assoc_opts sw)
 256
 257 lookup_str sw = firstJust (map (startsWith sw) unpacked_opts)
 258
 259 lookup_int sw = case (lookup_str sw) of
 260                   Nothing -> Nothing
 261                   Just xx -> Just (read xx)
 262
 263 lookup_def_int sw def = case (lookup_str sw) of
 264                             Nothing -> def              -- Use default
 265                             Just xx -> read xx
 266
 267 lookup_def_float sw def = case (lookup_str sw) of
 268                             Nothing -> def              -- Use default
 269                             Just xx -> read xx
 270
 271 assoc_opts    = assocMaybe [ (a, True) | a <- argv ]
 272 unpacked_opts = map _UNPK_ argv
 273 \end{code}
 274
 275 \begin{code}
 276 opt_AllStrict                   = lookUp  SLIT("-fall-strict")
 277 opt_AllowOverlappingInstances   = lookUp  SLIT("-fallow-overlapping-instances")
 278 opt_AutoSccsOnAllToplevs        = lookUp  SLIT("-fauto-sccs-on-all-toplevs")
 279 opt_AutoSccsOnExportedToplevs   = lookUp  SLIT("-fauto-sccs-on-exported-toplevs")
 280 opt_AutoSccsOnIndividualCafs    = lookUp  SLIT("-fauto-sccs-on-individual-cafs")
 281 opt_CompilingGhcInternals       = maybeToBool maybe_CompilingGhcInternals
 282 maybe_CompilingGhcInternals     = lookup_str "-fcompiling-ghc-internals="
 283 opt_D_dump_absC                 = lookUp  SLIT("-ddump-absC")
 284 opt_D_dump_asm                  = lookUp  SLIT("-ddump-asm")
 285 opt_D_dump_deriv                = lookUp  SLIT("-ddump-deriv")
 286 opt_D_dump_ds                   = lookUp  SLIT("-ddump-ds")
 287 opt_D_dump_flatC                = lookUp  SLIT("-ddump-flatC")
 288 opt_D_dump_occur_anal           = lookUp  SLIT("-ddump-occur-anal")
 289 opt_D_dump_rdr                  = lookUp  SLIT("-ddump-rdr")
 290 opt_D_dump_realC                = lookUp  SLIT("-ddump-realC")
 291 opt_D_dump_rn                   = lookUp  SLIT("-ddump-rn")
 292 opt_D_dump_simpl                = lookUp  SLIT("-ddump-simpl")
 293 opt_D_dump_simpl_iterations     = lookUp  SLIT("-ddump-simpl-iterations")
 294 opt_D_dump_spec                 = lookUp  SLIT("-ddump-spec")
 295 opt_D_dump_stg                  = lookUp  SLIT("-ddump-stg")
 296 opt_D_dump_stranal              = lookUp  SLIT("-ddump-stranal")
 297 opt_D_dump_tc                   = lookUp  SLIT("-ddump-tc")
 298 opt_D_show_passes               = lookUp  SLIT("-dshow-passes")
 299 opt_D_show_rn_trace             = lookUp  SLIT("-dshow-rn-trace")
 300 opt_D_show_rn_imports           = lookUp  SLIT("-dshow-rn-imports")
 301 opt_D_simplifier_stats          = lookUp  SLIT("-dsimplifier-stats")
 302 opt_D_source_stats              = lookUp  SLIT("-dsource-stats")
 303 opt_D_verbose_core2core         = lookUp  SLIT("-dverbose-simpl")
 304 opt_D_verbose_stg2stg           = lookUp  SLIT("-dverbose-stg")
 305 opt_DoCoreLinting               = lookUp  SLIT("-dcore-lint")
 306 opt_DoStgLinting                = lookUp  SLIT("-dstg-lint")
 307 opt_DoSemiTagging               = lookUp  SLIT("-fsemi-tagging")
 308 opt_DoTickyProfiling            = lookUp  SLIT("-fticky-ticky")
 309 opt_DoEtaReduction              = lookUp  SLIT("-fdo-eta-reduction")
 310 opt_EnsureSplittableC           = lookUp  SLIT("-fglobalise-toplev-names")
 311 opt_FoldrBuildOn                = lookUp  SLIT("-ffoldr-build-on")
 312 opt_ForConcurrent               = lookUp  SLIT("-fconcurrent")
 313 opt_GranMacros                  = lookUp  SLIT("-fgransim")
 314 opt_GlasgowExts                 = lookUp  SLIT("-fglasgow-exts")
 315 opt_HiMap                       = lookup_str "-himap="  -- file saying where to look for .hi files
 316 opt_IgnoreIfacePragmas          = lookUp  SLIT("-fignore-interface-pragmas")
 317 opt_IrrefutableTuples           = lookUp  SLIT("-firrefutable-tuples")
 318 opt_MultiParamClasses           = opt_GlasgowExts
 319 opt_NoImplicitPrelude           = lookUp  SLIT("-fno-implicit-prelude")
 320 opt_NoHiCheck                   = lookUp  SLIT("-fno-hi-version-check")
 321 opt_NumbersStrict               = lookUp  SLIT("-fnumbers-strict")
 322 opt_OmitBlackHoling             = lookUp  SLIT("-dno-black-holing")
 323 opt_OmitInterfacePragmas        = lookUp  SLIT("-fomit-interface-pragmas")
 324 opt_PprStyle_All                = lookUp  SLIT("-dppr-all")
 325 opt_PprStyle_Debug              = lookUp  SLIT("-dppr-debug")
 326 opt_PprStyle_User               = lookUp  SLIT("-dppr-user")
 327 opt_PprUserLength               = lookup_def_int "-dppr-user-length" 5 --ToDo: give this a name
 328 opt_ProduceC                    = lookup_str "-C="
 329 opt_ProduceS                    = lookup_str "-S="
 330 opt_ProduceHi                   = lookup_str "-hifile=" -- the one to produce this time
 331 opt_ReportWhyUnfoldingsDisallowed= lookUp SLIT("-freport-disallowed-unfoldings")
 332 opt_SccProfilingOn              = lookUp  SLIT("-fscc-profiling")
 333 opt_ShowImportSpecs             = lookUp  SLIT("-fshow-import-specs")
 334 opt_SigsRequired                = lookUp  SLIT("-fsignatures-required")
 335 opt_SourceUnchanged             = lookUp  SLIT("-fsource-unchanged")
 336 opt_SpecialiseAll               = lookUp  SLIT("-fspecialise-all")
 337 opt_SpecialiseImports           = lookUp  SLIT("-fspecialise-imports")
 338 opt_SpecialiseOverloaded        = lookUp  SLIT("-fspecialise-overloaded")
 339 opt_SpecialiseTrace             = lookUp  SLIT("-ftrace-specialisation")
 340 opt_SpecialiseUnboxed           = lookUp  SLIT("-fspecialise-unboxed")
 341 opt_StgDoLetNoEscapes           = lookUp  SLIT("-flet-no-escape")
 342 opt_ReturnInRegsThreshold       = lookup_int "-freturn-in-regs-threshold"
 343 opt_SccGroup                    = lookup_str "-G="
 344 opt_Verbose                     = lookUp  SLIT("-v")
 345
 346 opt_InterfaceUnfoldThreshold    = lookup_def_int "-funfolding-interface-threshold" iNTERFACE_UNFOLD_THRESHOLD
 347 opt_UnfoldingCreationThreshold  = lookup_def_int "-funfolding-creation-threshold"  uNFOLDING_CREATION_THRESHOLD
 348 opt_UnfoldingUseThreshold       = lookup_def_int "-funfolding-use-threshold"       uNFOLDING_USE_THRESHOLD
 349 opt_UnfoldingConDiscount        = lookup_def_int "-funfolding-con-discount"        uNFOLDING_CON_DISCOUNT_WEIGHT
 350
 351 opt_LiberateCaseThreshold       = lookup_def_int "-fliberate-case-threshold"       lIBERATE_CASE_THRESHOLD
 352 opt_UnfoldingKeenessFactor      = lookup_def_float "-funfolding-keeness-factor"    uNFOLDING_KEENESS_FACTOR
 353 opt_WarnNameShadowing           = lookUp  SLIT("-fwarn-name-shadowing")
 354 opt_WarnHiShadows               = lookUp  SLIT("-fwarn-hi-shadowing")
 355 opt_WarnIncompletePatterns      = lookUp  SLIT("-fwarn-incomplete-patterns")
 356 opt_WarnOverlappingPatterns     = lookUp  SLIT("-fwarn-overlapping-patterns")
 357 opt_WarnSimplePatterns          = lookUp  SLIT("-fwarn-simple-patterns")
 358 opt_WarnUnusedMatches           = lookUp  SLIT("-fwarn-unused-matches")
 359 opt_WarnUnusedBinds             = lookUp  SLIT("-fwarn-unused-binds")
 360 opt_WarnUnusedImports           = lookUp  SLIT("-fwarn-unused-imports")
 361 opt_WarnMissingMethods          = lookUp  SLIT("-fwarn-missing-methods")
 362 opt_WarnDuplicateExports        = lookUp  SLIT("-fwarn-duplicate-exports")
 363 opt_PruneTyDecls                = not (lookUp SLIT("-fno-prune-tydecls"))
 364 opt_PruneInstDecls              = not (lookUp SLIT("-fno-prune-instdecls"))
 365 opt_D_show_rn_stats             = lookUp SLIT("-dshow-rn-stats")
 366
 367 -- opt_UnfoldingOverrideThreshold       = lookup_int "-funfolding-override-threshold"
 368 \end{code}
 369
 370 \begin{code}
 371 classifyOpts :: ([CoreToDo],    -- Core-to-Core processing spec
 372                  [StgToDo])     -- STG-to-STG   processing spec
 373
 374 classifyOpts = sep argv [] [] -- accumulators...
 375   where
 376     sep :: [FAST_STRING]                         -- cmd-line opts (input)
 377         -> [CoreToDo] -> [StgToDo]       -- to_do accumulators
 378         -> ([CoreToDo], [StgToDo])       -- result
 379
 380     sep [] core_td stg_td -- all done!
 381       = (reverse core_td, reverse stg_td)
 382
 383 #       define CORE_TD(to_do) sep opts (to_do:core_td) stg_td
 384 #       define STG_TD(to_do)  sep opts core_td (to_do:stg_td)
 385 #       define IGNORE_ARG()   sep opts core_td stg_td
 386
 387     sep (opt1:opts) core_td stg_td
 388       =
 389         case (_UNPK_ opt1) of -- the non-"just match a string" options are at the end...
 390
 391           ',' : _       -> IGNORE_ARG() -- it is for the parser
 392
 393           "-fsimplify"  -> -- gather up SimplifierSwitches specially...
 394                            simpl_sep opts defaultSimplSwitches core_td stg_td
 395
 396           "-fcalc-inlinings1"-> CORE_TD(CoreDoCalcInlinings1)
 397           "-fcalc-inlinings2"-> CORE_TD(CoreDoCalcInlinings2)
 398           "-ffloat-inwards"  -> CORE_TD(CoreDoFloatInwards)
 399           "-ffull-laziness"  -> CORE_TD(CoreDoFullLaziness)
 400           "-fliberate-case"  -> CORE_TD(CoreLiberateCase)
 401           "-fprint-core"     -> CORE_TD(CoreDoPrintCore)
 402           "-fstatic-args"    -> CORE_TD(CoreDoStaticArgs)
 403           "-fstrictness"     -> CORE_TD(CoreDoStrictness)
 404           "-fspecialise"     -> CORE_TD(CoreDoSpecialising)
 405           "-ffoldr-build-worker-wrapper"  -> CORE_TD(CoreDoFoldrBuildWorkerWrapper)
 406           "-ffoldr-build-ww-anal"  -> CORE_TD(CoreDoFoldrBuildWWAnal)
 407
 408           "-fstg-static-args" -> STG_TD(StgDoStaticArgs)
 409           "-fupdate-analysis" -> STG_TD(StgDoUpdateAnalysis)
 410           "-dstg-stats"       -> STG_TD(D_stg_stats)
 411           "-flambda-lift"     -> STG_TD(StgDoLambdaLift)
 412           "-fmassage-stg-for-profiling" -> STG_TD(StgDoMassageForProfiling)
 413
 414           _ -> -- NB: the driver is really supposed to handle bad options
 415                IGNORE_ARG()
 416
 417     ----------------
 418
 419     simpl_sep :: [FAST_STRING]      -- cmd-line opts (input)
 420         -> [SimplifierSwitch]       -- simplifier-switch accumulator
 421         -> [CoreToDo] -> [StgToDo]  -- to_do accumulators
 422         -> ([CoreToDo], [StgToDo])  -- result
 423
 424         -- "simpl_sep" tailcalls "sep" once it's seen one set
 425         -- of SimplifierSwitches for a CoreDoSimplify.
 426
 427 #ifdef DEBUG
 428     simpl_sep input@[] simpl_sw core_td stg_td
 429       = panic "simpl_sep []"
 430 #endif
 431
 432         -- The SimplifierSwitches should be delimited by "[" and "]".
 433
 434     simpl_sep (opt1:opts) simpl_sw core_td stg_td
 435       = case (_UNPK_ opt1) of
 436           "[" -> simpl_sep opts simpl_sw core_td stg_td
 437           "]" -> let
 438                     this_simpl = CoreDoSimplify (isAmongSimpl simpl_sw)
 439                  in
 440                  sep opts (this_simpl : core_td) stg_td
 441
 442 #         define SIMPL_SW(sw) simpl_sep opts (sw:simpl_sw) core_td stg_td
 443
 444           -- the non-"just match a string" options are at the end...
 445           "-fshow-simplifier-progress"      -> SIMPL_SW(ShowSimplifierProgress)
 446           "-fcode-duplication-ok"           -> SIMPL_SW(SimplOkToDupCode)
 447           "-ffloat-lets-exposing-whnf"      -> SIMPL_SW(SimplFloatLetsExposingWHNF)
 448           "-ffloat-primops-ok"              -> SIMPL_SW(SimplOkToFloatPrimOps)
 449           "-falways-float-lets-from-lets"   -> SIMPL_SW(SimplAlwaysFloatLetsFromLets)
 450           "-fdo-case-elim"                  -> SIMPL_SW(SimplDoCaseElim)
 451           "-fdo-lambda-eta-expansion"       -> SIMPL_SW(SimplDoLambdaEtaExpansion)
 452           "-fdo-foldr-build"                -> SIMPL_SW(SimplDoFoldrBuild)
 453           "-fdo-not-fold-back-append"       -> SIMPL_SW(SimplDontFoldBackAppend)
 454           "-fdo-arity-expand"               -> SIMPL_SW(SimplDoArityExpand)
 455           "-fdo-inline-foldr-build"         -> SIMPL_SW(SimplDoInlineFoldrBuild)
 456           "-freuse-con"                     -> SIMPL_SW(SimplReuseCon)
 457           "-fcase-of-case"                  -> SIMPL_SW(SimplCaseOfCase)
 458           "-fcase-merge"                    -> SIMPL_SW(SimplCaseMerge)
 459           "-flet-to-case"                   -> SIMPL_SW(SimplLetToCase)
 460           "-fpedantic-bottoms"              -> SIMPL_SW(SimplPedanticBottoms)
 461           "-fmay-delete-conjurable-ids"     -> SIMPL_SW(SimplMayDeleteConjurableIds)
 462           "-fessential-unfoldings-only"     -> SIMPL_SW(EssentialUnfoldingsOnly)
 463           "-fignore-inline-pragma"          -> SIMPL_SW(IgnoreINLINEPragma)
 464           "-fno-let-from-case"              -> SIMPL_SW(SimplNoLetFromCase)
 465           "-fno-let-from-app"               -> SIMPL_SW(SimplNoLetFromApp)
 466           "-fno-let-from-strict-let"        -> SIMPL_SW(SimplNoLetFromStrictLet)
 467           "-fclone-binds"                   -> SIMPL_SW(SimplCloneBinds)
 468
 469           o | starts_with_msi  -> SIMPL_SW(MaxSimplifierIterations (read after_msi))
 470            where
 471             maybe_msi           = startsWith "-fmax-simplifier-iterations"   o
 472             starts_with_msi     = maybeToBool maybe_msi
 473             (Just after_msi)    = maybe_msi
 474
 475           _ -> -- NB: the driver is really supposed to handle bad options
 476                simpl_sep opts simpl_sw core_td stg_td
 477 \end{code}
 478
 479 %************************************************************************
 480 %*                                                                      *
 481 \subsection{Switch ordering}
 482 %*                                                                      *
 483 %************************************************************************
 484
 485 In spite of the @Produce*@ and @SccGroup@ constructors, these things
 486 behave just like enumeration types.
 487
 488 \begin{code}
 489 instance Eq SimplifierSwitch where
 490     a == b = tagOf_SimplSwitch a _EQ_ tagOf_SimplSwitch b
 491
 492 instance Ord SimplifierSwitch where
 493     a <  b  = tagOf_SimplSwitch a _LT_ tagOf_SimplSwitch b
 494     a <= b  = tagOf_SimplSwitch a _LE_ tagOf_SimplSwitch b
 495
 496 tagOf_SimplSwitch SimplOkToDupCode              =(ILIT(0) :: FAST_INT)
 497 tagOf_SimplSwitch SimplFloatLetsExposingWHNF    = ILIT(1)
 498 tagOf_SimplSwitch SimplOkToFloatPrimOps         = ILIT(2)
 499 tagOf_SimplSwitch SimplAlwaysFloatLetsFromLets  = ILIT(3)
 500 tagOf_SimplSwitch SimplDoCaseElim               = ILIT(4)
 501 tagOf_SimplSwitch SimplReuseCon                 = ILIT(5)
 502 tagOf_SimplSwitch SimplCaseOfCase               = ILIT(6)
 503 tagOf_SimplSwitch SimplLetToCase                = ILIT(7)
 504 tagOf_SimplSwitch SimplMayDeleteConjurableIds   = ILIT(9)
 505 tagOf_SimplSwitch SimplPedanticBottoms          = ILIT(10)
 506 tagOf_SimplSwitch SimplDoArityExpand            = ILIT(11)
 507 tagOf_SimplSwitch SimplDoFoldrBuild             = ILIT(12)
 508 tagOf_SimplSwitch SimplDoInlineFoldrBuild       = ILIT(14)
 509 tagOf_SimplSwitch IgnoreINLINEPragma            = ILIT(15)
 510 tagOf_SimplSwitch SimplDoLambdaEtaExpansion     = ILIT(16)
 511 tagOf_SimplSwitch EssentialUnfoldingsOnly       = ILIT(19)
 512 tagOf_SimplSwitch ShowSimplifierProgress        = ILIT(20)
 513 tagOf_SimplSwitch (MaxSimplifierIterations _)   = ILIT(21)
 514 tagOf_SimplSwitch SimplNoLetFromCase            = ILIT(27)
 515 tagOf_SimplSwitch SimplNoLetFromApp             = ILIT(28)
 516 tagOf_SimplSwitch SimplNoLetFromStrictLet       = ILIT(29)
 517 tagOf_SimplSwitch SimplDontFoldBackAppend       = ILIT(30)
 518 tagOf_SimplSwitch SimplCaseMerge                = ILIT(31)
 519 tagOf_SimplSwitch SimplCaseScrutinee            = ILIT(32)
 520 tagOf_SimplSwitch SimplCloneBinds               = ILIT(33)
 521
 522 -- If you add anything here, be sure to change lAST_SIMPL_SWITCH_TAG, too!
 523
 524 tagOf_SimplSwitch _ = panic# "tagOf_SimplSwitch"
 525
 526 lAST_SIMPL_SWITCH_TAG = IBOX(tagOf_SimplSwitch SimplCloneBinds)
 527 \end{code}
 528
 529 %************************************************************************
 530 %*                                                                      *
 531 \subsection{Switch lookup}
 532 %*                                                                      *
 533 %************************************************************************
 534
 535 \begin{code}
 536 # define ARRAY      Array
 537 # define LIFT       Lift
 538 # define SET_TO     =:
 539 (=:) a b = (a,b)
 540
 541 isAmongSimpl :: [SimplifierSwitch] -> SimplifierSwitch -> SwitchResult
 542
 543 isAmongSimpl on_switches                -- Switches mentioned later occur *earlier*
 544                                         -- in the list; defaults right at the end.
 545   = let
 546         tidied_on_switches = foldl rm_dups [] on_switches
 547                 -- The fold*l* ensures that we keep the latest switches;
 548                 -- ie the ones that occur earliest in the list.
 549
 550         sw_tbl :: Array Int SwitchResult
 551
 552         sw_tbl = (array (0, lAST_SIMPL_SWITCH_TAG) -- bounds...
 553                         all_undefined)
 554                  // defined_elems
 555
 556         all_undefined = [ i SET_TO SwBool False | i <- [0 .. lAST_SIMPL_SWITCH_TAG ] ]
 557
 558         defined_elems = map mk_assoc_elem tidied_on_switches
 559     in
 560     -- (avoid some unboxing, bounds checking, and other horrible things:)
 561     case sw_tbl of { ARRAY bounds_who_needs_'em stuff ->
 562     \ switch ->
 563         case (indexArray# stuff (tagOf_SimplSwitch switch)) of
 564           LIFT v -> v
 565     }
 566   where
 567     mk_assoc_elem k@(MaxSimplifierIterations lvl)       = IBOX(tagOf_SimplSwitch k) SET_TO SwInt lvl
 568
 569     mk_assoc_elem k = IBOX(tagOf_SimplSwitch k) SET_TO SwBool   True -- I'm here, Mom!
 570
 571     -- cannot have duplicates if we are going to use the array thing
 572     rm_dups switches_so_far switch
 573       = if switch `is_elem` switches_so_far
 574         then switches_so_far
 575         else switch : switches_so_far
 576       where
 577         sw `is_elem` []     = False
 578         sw `is_elem` (s:ss) = (tagOf_SimplSwitch sw) _EQ_ (tagOf_SimplSwitch s)
 579                             || sw `is_elem` ss
 580 \end{code}
 581
 582 Default settings for simplifier switches
 583
 584 \begin{code}
 585 defaultSimplSwitches = [MaxSimplifierIterations         1
 586                        ]
 587 \end{code}
 588
 589 %************************************************************************
 590 %*                                                                      *
 591 \subsection{Misc functions for command-line options}
 592 %*                                                                      *
 593 %************************************************************************
 594
 595
 596 \begin{code}
 597 switchIsOn :: (switch -> SwitchResult) -> switch -> Bool
 598
 599 switchIsOn lookup_fn switch
 600   = case (lookup_fn switch) of
 601       SwBool False -> False
 602       _            -> True
 603
 604 intSwitchSet :: (switch -> SwitchResult)
 605              -> (Int -> switch)
 606              -> Maybe Int
 607
 608 intSwitchSet lookup_fn switch
 609   = case (lookup_fn (switch (panic "intSwitchSet"))) of
 610       SwInt int -> Just int
 611       _         -> Nothing
 612 \end{code}