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 #include "HsVersions.h"
   8
   9 module CmdLineOpts (
  10         CoreToDo(..),
  11         SimplifierSwitch(..),
  12         StgToDo(..),
  13         SwitchResult(..),
  14         classifyOpts,
  15
  16         intSwitchSet,
  17         switchIsOn,
  18
  19         maybe_CompilingGhcInternals,
  20         opt_AllDemanded,
  21         opt_AllStrict,
  22         opt_AutoSccsOnAllToplevs,
  23         opt_AutoSccsOnExportedToplevs,
  24         opt_AutoSccsOnIndividualCafs,
  25         opt_CompilingGhcInternals,
  26         opt_D_dump_absC,
  27         opt_D_dump_asm,
  28         opt_D_dump_deforest,
  29         opt_D_dump_deriv,
  30         opt_D_dump_ds,
  31         opt_D_dump_flatC,
  32         opt_D_dump_occur_anal,
  33         opt_D_dump_rdr,
  34         opt_D_dump_realC,
  35         opt_D_dump_rn,
  36         opt_D_dump_simpl,
  37         opt_D_dump_simpl_iterations,
  38         opt_D_dump_spec,
  39         opt_D_dump_stg,
  40         opt_D_dump_stranal,
  41         opt_D_dump_tc,
  42         opt_D_show_passes,
  43         opt_D_show_rn_trace,
  44         opt_D_simplifier_stats,
  45         opt_D_source_stats,
  46         opt_D_verbose_core2core,
  47         opt_D_verbose_stg2stg,
  48         opt_DoCoreLinting,
  49         opt_DoStgLinting,
  50         opt_DoSemiTagging,
  51         opt_DoEtaReduction,
  52         opt_DoTickyProfiling,
  53         opt_EnsureSplittableC,
  54         opt_FoldrBuildOn,
  55         opt_FoldrBuildTrace,
  56         opt_ForConcurrent,
  57         opt_GlasgowExts,
  58         opt_GranMacros,
  59         opt_Haskell_1_3,
  60         opt_HiMap,
  61         opt_IgnoreIfacePragmas,
  62         opt_IgnoreStrictnessPragmas,
  63         opt_IrrefutableEverything,
  64         opt_IrrefutableTuples,
  65         opt_LiberateCaseThreshold,
  66         opt_NoImplicitPrelude,
  67         opt_NumbersStrict,
  68         opt_OmitBlackHoling,
  69         opt_OmitDefaultInstanceMethods,
  70         opt_OmitInterfacePragmas,
  71         opt_PprStyle_All,
  72         opt_PprStyle_Debug,
  73         opt_PprStyle_User,
  74         opt_PprUserLength,
  75         opt_ProduceC,
  76         opt_ProduceHi,
  77         opt_ProduceS,
  78         opt_ReportWhyUnfoldingsDisallowed,
  79         opt_ReturnInRegsThreshold,
  80         opt_SccGroup,
  81         opt_SccProfilingOn,
  82         opt_ShowImportSpecs,
  83         opt_ShowPragmaNameErrs,
  84         opt_SigsRequired,
  85         opt_SourceUnchanged,
  86         opt_SpecialiseAll,
  87         opt_SpecialiseImports,
  88         opt_SpecialiseOverloaded,
  89         opt_SpecialiseTrace,
  90         opt_SpecialiseUnboxed,
  91         opt_StgDoLetNoEscapes,
  92
  93         opt_InterfaceUnfoldThreshold,
  94         opt_UnfoldingCreationThreshold,
  95         opt_UnfoldingConDiscount,
  96         opt_UnfoldingUseThreshold,
  97
  98         opt_Verbose,
  99         opt_WarnNameShadowing,
 100         opt_WarnUnusedNames,
 101         opt_WarnIncompletePatterns,
 102         opt_PruneTyDecls, opt_PruneInstDecls,
 103         opt_D_show_unused_imports,
 104         opt_D_show_rn_stats
 105     ) where
 106
 107 IMPORT_1_3(Array(array, (//)))
 108 #if defined(__GLASGOW_HASKELL__) && __GLASGOW_HASKELL__ <= 201
 109 import PreludeGlaST     -- bad bad bad boy, Will (_Array internals)
 110 #else
 111 import GlaExts
 112 import ArrBase
 113 -- 2.04 and later exports Lift from GlaExts
 114 #if __GLASGOW_HASKELL__ < 204
 115 import PrelBase (Lift(..))
 116 #endif
 117 #endif
 118 import Argv
 119
 120 CHK_Ubiq() -- debugging consistency check
 121
 122 import Constants        -- Default values for some flags
 123
 124 import Maybes           ( assocMaybe, firstJust, maybeToBool )
 125 import Util             ( startsWith, panic, panic#, assertPanic )
 126 \end{code}
 127
 128 A command-line {\em switch} is (generally) either on or off; e.g., the
 129 ``verbose'' (-v) switch is either on or off.  (The \tr{-G<group>}
 130 switch is an exception; it's set to a string, or nothing.)
 131
 132 A list of {\em ToDo}s is things to be done in a particular part of
 133 processing.  A (fictitious) example for the Core-to-Core simplifier
 134 might be: run the simplifier, then run the strictness analyser, then
 135 run the simplifier again (three ``todos'').
 136
 137 There are three ``to-do processing centers'' at the moment.  In the
 138 main loop (\tr{main/Main.lhs}), in the Core-to-Core processing loop
 139 (\tr{simplCore/SimplCore.lhs), and in the STG-to-STG processing loop
 140 (\tr{simplStg/SimplStg.lhs}).
 141
 142 %************************************************************************
 143 %*                                                                      *
 144 \subsection{Datatypes associated with command-line options}
 145 %*                                                                      *
 146 %************************************************************************
 147
 148 \begin{code}
 149 data SwitchResult
 150   = SwBool      Bool            -- on/off
 151   | SwString    FAST_STRING     -- nothing or a String
 152   | SwInt       Int             -- nothing or an Int
 153 \end{code}
 154
 155 \begin{code}
 156 data CoreToDo           -- These are diff core-to-core passes,
 157                         -- which may be invoked in any order,
 158                         -- as many times as you like.
 159
 160   = CoreDoSimplify      -- The core-to-core simplifier.
 161         (SimplifierSwitch -> SwitchResult)
 162                         -- Each run of the simplifier can take a different
 163                         -- set of simplifier-specific flags.
 164   | CoreDoCalcInlinings1
 165   | CoreDoCalcInlinings2
 166   | CoreDoFloatInwards
 167   | CoreDoFullLaziness
 168   | CoreLiberateCase
 169   | CoreDoPrintCore
 170   | CoreDoStaticArgs
 171   | CoreDoStrictness
 172   | CoreDoSpecialising
 173   | CoreDoDeforest
 174   | CoreDoFoldrBuildWorkerWrapper
 175   | CoreDoFoldrBuildWWAnal
 176 \end{code}
 177
 178 \begin{code}
 179 data StgToDo
 180   = StgDoStaticArgs
 181   | StgDoUpdateAnalysis
 182   | StgDoLambdaLift
 183   | StgDoMassageForProfiling  -- should be (next to) last
 184   -- There's also setStgVarInfo, but its absolute "lastness"
 185   -- is so critical that it is hardwired in (no flag).
 186   | D_stg_stats
 187 \end{code}
 188
 189 \begin{code}
 190 data SimplifierSwitch
 191   = SimplOkToDupCode
 192   | SimplFloatLetsExposingWHNF
 193   | SimplOkToFloatPrimOps
 194   | SimplAlwaysFloatLetsFromLets
 195   | SimplDoCaseElim
 196   | SimplReuseCon
 197   | SimplCaseOfCase
 198   | SimplLetToCase
 199   | SimplMayDeleteConjurableIds
 200   | SimplPedanticBottoms -- see Simplifier for an explanation
 201   | SimplDoArityExpand   -- expand arity of bindings
 202   | SimplDoFoldrBuild    -- This is the per-simplification flag;
 203                          -- see also FoldrBuildOn, used elsewhere
 204                          -- in the compiler.
 205   | SimplDoInlineFoldrBuild
 206                          -- inline foldr/build (*after* f/b rule is used)
 207
 208   | IgnoreINLINEPragma
 209   | SimplDoLambdaEtaExpansion
 210
 211   | EssentialUnfoldingsOnly -- never mind the thresholds, only
 212                             -- do unfoldings that *must* be done
 213                             -- (to saturate constructors and primitives)
 214
 215   | ShowSimplifierProgress  -- report counts on every interation
 216
 217   | MaxSimplifierIterations Int
 218
 219   | KeepSpecPragmaIds       -- We normally *toss* Ids we can do without
 220   | KeepUnusedBindings
 221
 222   | SimplNoLetFromCase      -- used when turning off floating entirely
 223   | SimplNoLetFromApp       -- (for experimentation only) WDP 95/10
 224   | SimplNoLetFromStrictLet
 225
 226   | SimplDontFoldBackAppend
 227                         -- we fold `foldr (:)' back into flip (++),
 228                         -- but we *don't* want to do it when compiling
 229                         -- List.hs, otherwise
 230                         -- xs ++ ys = foldr (:) ys xs
 231                         -- {- via our loopback -}
 232                         -- xs ++ ys = xs ++ ys
 233                         -- Oops!
 234                         -- So only use this flag inside List.hs
 235                         -- (Sigh, what a HACK, Andy.  WDP 96/01)
 236
 237   | SimplCaseMerge
 238   | SimplCaseScrutinee  -- This flag tells that the expression being simplified is
 239                         -- the scrutinee of a case expression, so we should
 240                         -- apply the scrutinee discount when considering inlinings.
 241                         -- See SimplVar.lhs
 242 \end{code}
 243
 244 %************************************************************************
 245 %*                                                                      *
 246 \subsection{Classifying command-line options}
 247 %*                                                                      *
 248 %************************************************************************
 249
 250 \begin{code}
 251 lookUp         :: FAST_STRING -> Bool
 252 lookup_int     :: String -> Maybe Int
 253 lookup_def_int :: String -> Int -> Int
 254 lookup_str     :: String -> Maybe String
 255
 256 lookUp     sw = maybeToBool (assoc_opts sw)
 257
 258 lookup_str sw = firstJust (map (startsWith sw) unpacked_opts)
 259
 260 lookup_int sw = case (lookup_str sw) of
 261                   Nothing -> Nothing
 262                   Just xx -> Just (read xx)
 263
 264 lookup_def_int sw def = case (lookup_str sw) of
 265                             Nothing -> def              -- Use default
 266                             Just xx -> read xx
 267
 268 assoc_opts    = assocMaybe [ (a, True) | a <- argv ]
 269 unpacked_opts = map _UNPK_ argv
 270 \end{code}
 271
 272 \begin{code}
 273 opt_AllDemanded                 = lookUp  SLIT("-fall-demanded")
 274 opt_AllStrict                   = lookUp  SLIT("-fall-strict")
 275 opt_AutoSccsOnAllToplevs        = lookUp  SLIT("-fauto-sccs-on-all-toplevs")
 276 opt_AutoSccsOnExportedToplevs   = lookUp  SLIT("-fauto-sccs-on-exported-toplevs")
 277 opt_AutoSccsOnIndividualCafs    = lookUp  SLIT("-fauto-sccs-on-individual-cafs")
 278 opt_CompilingGhcInternals       = maybeToBool maybe_CompilingGhcInternals
 279 maybe_CompilingGhcInternals     = lookup_str "-fcompiling-ghc-internals="
 280 opt_D_dump_absC                 = lookUp  SLIT("-ddump-absC")
 281 opt_D_dump_asm                  = lookUp  SLIT("-ddump-asm")
 282 opt_D_dump_deforest             = lookUp  SLIT("-ddump-deforest")
 283 opt_D_dump_deriv                = lookUp  SLIT("-ddump-deriv")
 284 opt_D_dump_ds                   = lookUp  SLIT("-ddump-ds")
 285 opt_D_dump_flatC                = lookUp  SLIT("-ddump-flatC")
 286 opt_D_dump_occur_anal           = lookUp  SLIT("-ddump-occur-anal")
 287 opt_D_dump_rdr                  = lookUp  SLIT("-ddump-rdr")
 288 opt_D_dump_realC                = lookUp  SLIT("-ddump-realC")
 289 opt_D_dump_rn                   = lookUp  SLIT("-ddump-rn")
 290 opt_D_dump_simpl                = lookUp  SLIT("-ddump-simpl")
 291 opt_D_dump_simpl_iterations     = lookUp  SLIT("-ddump-simpl-iterations")
 292 opt_D_dump_spec                 = lookUp  SLIT("-ddump-spec")
 293 opt_D_dump_stg                  = lookUp  SLIT("-ddump-stg")
 294 opt_D_dump_stranal              = lookUp  SLIT("-ddump-stranal")
 295 opt_D_dump_tc                   = lookUp  SLIT("-ddump-tc")
 296 opt_D_show_passes               = lookUp  SLIT("-dshow-passes")
 297 opt_D_show_rn_trace             = lookUp  SLIT("-dshow-rn-trace")
 298 opt_D_simplifier_stats          = lookUp  SLIT("-dsimplifier-stats")
 299 opt_D_source_stats              = lookUp  SLIT("-dsource-stats")
 300 opt_D_verbose_core2core         = lookUp  SLIT("-dverbose-simpl")
 301 opt_D_verbose_stg2stg           = lookUp  SLIT("-dverbose-stg")
 302 opt_DoCoreLinting               = lookUp  SLIT("-dcore-lint")
 303 opt_DoStgLinting                = lookUp  SLIT("-dstg-lint")
 304 opt_DoSemiTagging               = lookUp  SLIT("-fsemi-tagging")
 305 opt_DoTickyProfiling            = lookUp  SLIT("-fticky-ticky")
 306 opt_DoEtaReduction              = lookUp  SLIT("-fdo-eta-reduction")
 307 opt_EnsureSplittableC           = lookUp  SLIT("-fglobalise-toplev-names")
 308 opt_FoldrBuildOn                = lookUp  SLIT("-ffoldr-build-on")
 309 opt_FoldrBuildTrace             = lookUp  SLIT("-ffoldr-build-trace")
 310 opt_ForConcurrent               = lookUp  SLIT("-fconcurrent")
 311 opt_GranMacros                  = lookUp  SLIT("-fgransim")
 312 opt_GlasgowExts                 = lookUp  SLIT("-fglasgow-exts")
 313 opt_Haskell_1_3                 = lookUp  SLIT("-fhaskell-1.3")
 314 opt_HiMap                       = lookup_str "-himap="  -- file saying where to look for .hi files
 315 opt_IgnoreIfacePragmas          = lookUp  SLIT("-fignore-interface-pragmas")
 316 opt_IgnoreStrictnessPragmas     = lookUp  SLIT("-fignore-strictness-pragmas")
 317 opt_IrrefutableEverything       = lookUp  SLIT("-firrefutable-everything")
 318 opt_IrrefutableTuples           = lookUp  SLIT("-firrefutable-tuples")
 319 opt_NoImplicitPrelude           = lookUp  SLIT("-fno-implicit-prelude")
 320 opt_NumbersStrict               = lookUp  SLIT("-fnumbers-strict")
 321 opt_OmitBlackHoling             = lookUp  SLIT("-dno-black-holing")
 322 opt_OmitDefaultInstanceMethods  = lookUp  SLIT("-fomit-default-instance-methods")
 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_ShowPragmaNameErrs          = lookUp  SLIT("-fshow-pragma-name-errs")
 335 opt_SigsRequired                = lookUp  SLIT("-fsignatures-required")
 336 opt_SourceUnchanged             = lookUp  SLIT("-fsource-unchanged")
 337 opt_SpecialiseAll               = lookUp  SLIT("-fspecialise-all")
 338 opt_SpecialiseImports           = lookUp  SLIT("-fspecialise-imports")
 339 opt_SpecialiseOverloaded        = lookUp  SLIT("-fspecialise-overloaded")
 340 opt_SpecialiseTrace             = lookUp  SLIT("-ftrace-specialisation")
 341 opt_SpecialiseUnboxed           = lookUp  SLIT("-fspecialise-unboxed")
 342 opt_StgDoLetNoEscapes           = lookUp  SLIT("-flet-no-escape")
 343 opt_ReturnInRegsThreshold       = lookup_int "-freturn-in-regs-threshold"
 344 opt_SccGroup                    = lookup_str "-G="
 345 opt_Verbose                     = lookUp  SLIT("-v")
 346
 347 opt_InterfaceUnfoldThreshold    = lookup_def_int "-funfolding-interface-threshold" iNTERFACE_UNFOLD_THRESHOLD
 348 opt_UnfoldingCreationThreshold  = lookup_def_int "-funfolding-creation-threshold"  uNFOLDING_CREATION_THRESHOLD
 349 opt_UnfoldingUseThreshold       = lookup_def_int "-funfolding-use-threshold"       uNFOLDING_USE_THRESHOLD
 350 opt_UnfoldingConDiscount        = lookup_def_int "-funfolding-con-discount"        uNFOLDING_CON_DISCOUNT_WEIGHT
 351
 352 opt_LiberateCaseThreshold       = lookup_def_int "-fliberate-case-threshold"       lIBERATE_CASE_THRESHOLD
 353 opt_WarnNameShadowing           = lookUp  SLIT("-fwarn-name-shadowing")
 354 opt_WarnIncompletePatterns      = not (lookUp  SLIT("-fno-warn-incomplete-patterns"))
 355 opt_WarnUnusedNames             = lookUp  SLIT("-fwarn-unused-names")
 356 opt_PruneTyDecls                = not (lookUp SLIT("-fno-prune-tydecls"))
 357 opt_PruneInstDecls              = not (lookUp SLIT("-fno-prune-instdecls"))
 358 opt_D_show_unused_imports       = lookUp SLIT("-dshow-unused-imports")
 359 opt_D_show_rn_stats             = lookUp SLIT("-dshow-rn-stats")
 360
 361 -- opt_UnfoldingOverrideThreshold       = lookup_int "-funfolding-override-threshold"
 362 \end{code}
 363
 364 \begin{code}
 365 classifyOpts :: ([CoreToDo],    -- Core-to-Core processing spec
 366                  [StgToDo])     -- STG-to-STG   processing spec
 367
 368 classifyOpts = sep argv [] [] -- accumulators...
 369   where
 370     sep :: [FAST_STRING]                         -- cmd-line opts (input)
 371         -> [CoreToDo] -> [StgToDo]       -- to_do accumulators
 372         -> ([CoreToDo], [StgToDo])       -- result
 373
 374     sep [] core_td stg_td -- all done!
 375       = (reverse core_td, reverse stg_td)
 376
 377 #       define CORE_TD(to_do) sep opts (to_do:core_td) stg_td
 378 #       define STG_TD(to_do)  sep opts core_td (to_do:stg_td)
 379 #       define IGNORE_ARG()   sep opts core_td stg_td
 380
 381     sep (opt1:opts) core_td stg_td
 382       =
 383         case (_UNPK_ opt1) of -- the non-"just match a string" options are at the end...
 384
 385           ',' : _       -> IGNORE_ARG() -- it is for the parser
 386
 387           "-fsimplify"  -> -- gather up SimplifierSwitches specially...
 388                            simpl_sep opts defaultSimplSwitches core_td stg_td
 389
 390           "-fcalc-inlinings1"-> CORE_TD(CoreDoCalcInlinings1)
 391           "-fcalc-inlinings2"-> CORE_TD(CoreDoCalcInlinings2)
 392           "-ffloat-inwards"  -> CORE_TD(CoreDoFloatInwards)
 393           "-ffull-laziness"  -> CORE_TD(CoreDoFullLaziness)
 394           "-fliberate-case"  -> CORE_TD(CoreLiberateCase)
 395           "-fprint-core"     -> CORE_TD(CoreDoPrintCore)
 396           "-fstatic-args"    -> CORE_TD(CoreDoStaticArgs)
 397           "-fstrictness"     -> CORE_TD(CoreDoStrictness)
 398           "-fspecialise"     -> CORE_TD(CoreDoSpecialising)
 399           "-fdeforest"       -> CORE_TD(CoreDoDeforest)
 400           "-ffoldr-build-worker-wrapper"  -> CORE_TD(CoreDoFoldrBuildWorkerWrapper)
 401           "-ffoldr-build-ww-anal"  -> CORE_TD(CoreDoFoldrBuildWWAnal)
 402
 403           "-fstg-static-args" -> STG_TD(StgDoStaticArgs)
 404           "-fupdate-analysis" -> STG_TD(StgDoUpdateAnalysis)
 405           "-dstg-stats"       -> STG_TD(D_stg_stats)
 406           "-flambda-lift"     -> STG_TD(StgDoLambdaLift)
 407           "-fmassage-stg-for-profiling" -> STG_TD(StgDoMassageForProfiling)
 408
 409           _ -> -- NB: the driver is really supposed to handle bad options
 410                IGNORE_ARG()
 411
 412     ----------------
 413
 414     simpl_sep :: [FAST_STRING]      -- cmd-line opts (input)
 415         -> [SimplifierSwitch]       -- simplifier-switch accumulator
 416         -> [CoreToDo] -> [StgToDo]  -- to_do accumulators
 417         -> ([CoreToDo], [StgToDo])  -- result
 418
 419         -- "simpl_sep" tailcalls "sep" once it's seen one set
 420         -- of SimplifierSwitches for a CoreDoSimplify.
 421
 422 #ifdef DEBUG
 423     simpl_sep input@[] simpl_sw core_td stg_td
 424       = panic "simpl_sep []"
 425 #endif
 426
 427         -- The SimplifierSwitches should be delimited by "(" and ")".
 428
 429     simpl_sep (opt1:opts) simpl_sw core_td stg_td
 430       = case (_UNPK_ opt1) of
 431           "(" -> simpl_sep opts simpl_sw core_td stg_td
 432           ")" -> let
 433                     this_simpl = CoreDoSimplify (isAmongSimpl simpl_sw)
 434                  in
 435                  sep opts (this_simpl : core_td) stg_td
 436
 437 #         define SIMPL_SW(sw) simpl_sep opts (sw:simpl_sw) core_td stg_td
 438
 439           -- the non-"just match a string" options are at the end...
 440           "-fshow-simplifier-progress"      -> SIMPL_SW(ShowSimplifierProgress)
 441           "-fcode-duplication-ok"           -> SIMPL_SW(SimplOkToDupCode)
 442           "-ffloat-lets-exposing-whnf"      -> SIMPL_SW(SimplFloatLetsExposingWHNF)
 443           "-ffloat-primops-ok"              -> SIMPL_SW(SimplOkToFloatPrimOps)
 444           "-falways-float-lets-from-lets"   -> SIMPL_SW(SimplAlwaysFloatLetsFromLets)
 445           "-fdo-case-elim"                  -> SIMPL_SW(SimplDoCaseElim)
 446           "-fdo-lambda-eta-expansion"       -> SIMPL_SW(SimplDoLambdaEtaExpansion)
 447           "-fdo-foldr-build"                -> SIMPL_SW(SimplDoFoldrBuild)
 448           "-fdo-not-fold-back-append"       -> SIMPL_SW(SimplDontFoldBackAppend)
 449           "-fdo-arity-expand"               -> SIMPL_SW(SimplDoArityExpand)
 450           "-fdo-inline-foldr-build"         -> SIMPL_SW(SimplDoInlineFoldrBuild)
 451           "-freuse-con"                     -> SIMPL_SW(SimplReuseCon)
 452           "-fcase-of-case"                  -> SIMPL_SW(SimplCaseOfCase)
 453           "-fcase-merge"                    -> SIMPL_SW(SimplCaseMerge)
 454           "-flet-to-case"                   -> SIMPL_SW(SimplLetToCase)
 455           "-fpedantic-bottoms"              -> SIMPL_SW(SimplPedanticBottoms)
 456           "-fkeep-spec-pragma-ids"          -> SIMPL_SW(KeepSpecPragmaIds)
 457           "-fkeep-unused-bindings"          -> SIMPL_SW(KeepUnusedBindings)
 458           "-fmay-delete-conjurable-ids"     -> SIMPL_SW(SimplMayDeleteConjurableIds)
 459           "-fessential-unfoldings-only"     -> SIMPL_SW(EssentialUnfoldingsOnly)
 460           "-fignore-inline-pragma"          -> SIMPL_SW(IgnoreINLINEPragma)
 461           "-fno-let-from-case"              -> SIMPL_SW(SimplNoLetFromCase)
 462           "-fno-let-from-app"               -> SIMPL_SW(SimplNoLetFromApp)
 463           "-fno-let-from-strict-let"        -> SIMPL_SW(SimplNoLetFromStrictLet)
 464
 465           o | starts_with_msi  -> SIMPL_SW(MaxSimplifierIterations (read after_msi))
 466            where
 467             maybe_msi           = startsWith "-fmax-simplifier-iterations"   o
 468             starts_with_msi     = maybeToBool maybe_msi
 469             (Just after_msi)    = maybe_msi
 470
 471           _ -> -- NB: the driver is really supposed to handle bad options
 472                simpl_sep opts simpl_sw core_td stg_td
 473 \end{code}
 474
 475 %************************************************************************
 476 %*                                                                      *
 477 \subsection{Switch ordering}
 478 %*                                                                      *
 479 %************************************************************************
 480
 481 In spite of the @Produce*@ and @SccGroup@ constructors, these things
 482 behave just like enumeration types.
 483
 484 \begin{code}
 485 instance Eq SimplifierSwitch where
 486     a == b = tagOf_SimplSwitch a _EQ_ tagOf_SimplSwitch b
 487
 488 instance Ord SimplifierSwitch where
 489     a <  b  = tagOf_SimplSwitch a _LT_ tagOf_SimplSwitch b
 490     a <= b  = tagOf_SimplSwitch a _LE_ tagOf_SimplSwitch b
 491
 492 tagOf_SimplSwitch SimplOkToDupCode              =(ILIT(0) :: FAST_INT)
 493 tagOf_SimplSwitch SimplFloatLetsExposingWHNF    = ILIT(1)
 494 tagOf_SimplSwitch SimplOkToFloatPrimOps         = ILIT(2)
 495 tagOf_SimplSwitch SimplAlwaysFloatLetsFromLets  = ILIT(3)
 496 tagOf_SimplSwitch SimplDoCaseElim               = ILIT(4)
 497 tagOf_SimplSwitch SimplReuseCon                 = ILIT(5)
 498 tagOf_SimplSwitch SimplCaseOfCase               = ILIT(6)
 499 tagOf_SimplSwitch SimplLetToCase                = ILIT(7)
 500 tagOf_SimplSwitch SimplMayDeleteConjurableIds   = ILIT(9)
 501 tagOf_SimplSwitch SimplPedanticBottoms          = ILIT(10)
 502 tagOf_SimplSwitch SimplDoArityExpand            = ILIT(11)
 503 tagOf_SimplSwitch SimplDoFoldrBuild             = ILIT(12)
 504 tagOf_SimplSwitch SimplDoInlineFoldrBuild       = ILIT(14)
 505 tagOf_SimplSwitch IgnoreINLINEPragma            = ILIT(15)
 506 tagOf_SimplSwitch SimplDoLambdaEtaExpansion     = ILIT(16)
 507 tagOf_SimplSwitch EssentialUnfoldingsOnly       = ILIT(19)
 508 tagOf_SimplSwitch ShowSimplifierProgress        = ILIT(20)
 509 tagOf_SimplSwitch (MaxSimplifierIterations _)   = ILIT(21)
 510 tagOf_SimplSwitch KeepSpecPragmaIds             = ILIT(25)
 511 tagOf_SimplSwitch KeepUnusedBindings            = ILIT(26)
 512 tagOf_SimplSwitch SimplNoLetFromCase            = ILIT(27)
 513 tagOf_SimplSwitch SimplNoLetFromApp             = ILIT(28)
 514 tagOf_SimplSwitch SimplNoLetFromStrictLet       = ILIT(29)
 515 tagOf_SimplSwitch SimplDontFoldBackAppend       = ILIT(30)
 516 tagOf_SimplSwitch SimplCaseMerge                = ILIT(31)
 517 tagOf_SimplSwitch SimplCaseScrutinee            = ILIT(32)
 518
 519 -- If you add anything here, be sure to change lAST_SIMPL_SWITCH_TAG, too!
 520
 521 tagOf_SimplSwitch _ = panic# "tagOf_SimplSwitch"
 522
 523 lAST_SIMPL_SWITCH_TAG = IBOX(tagOf_SimplSwitch SimplCaseScrutinee)
 524 \end{code}
 525
 526 %************************************************************************
 527 %*                                                                      *
 528 \subsection{Switch lookup}
 529 %*                                                                      *
 530 %************************************************************************
 531
 532 \begin{code}
 533 #if __GLASGOW_HASKELL__ == 201
 534 # define ARRAY      Array
 535 # define LIFT       GHCbase.Lift
 536 # define SET_TO     =:
 537 (=:) a b = (a,b)
 538 #elif __GLASGOW_HASKELL__ >= 202
 539 # define ARRAY      Array
 540 # define LIFT       Lift
 541 # define SET_TO     =:
 542 (=:) a b = (a,b)
 543 #else
 544 # define ARRAY      _Array
 545 # define LIFT       _Lift
 546 # define SET_TO     :=
 547 #endif
 548
 549 isAmongSimpl :: [SimplifierSwitch] -> SimplifierSwitch -> SwitchResult
 550
 551 isAmongSimpl on_switches                -- Switches mentioned later occur *earlier*
 552                                         -- in the list; defaults right at the end.
 553   = let
 554         tidied_on_switches = foldl rm_dups [] on_switches
 555                 -- The fold*l* ensures that we keep the latest switches;
 556                 -- ie the ones that occur earliest in the list.
 557
 558         sw_tbl :: Array Int SwitchResult
 559
 560         sw_tbl = (array (0, lAST_SIMPL_SWITCH_TAG) -- bounds...
 561                         all_undefined)
 562                  // defined_elems
 563
 564         all_undefined = [ i SET_TO SwBool False | i <- [0 .. lAST_SIMPL_SWITCH_TAG ] ]
 565
 566         defined_elems = map mk_assoc_elem tidied_on_switches
 567     in
 568     -- (avoid some unboxing, bounds checking, and other horrible things:)
 569     case sw_tbl of { ARRAY bounds_who_needs_'em stuff ->
 570     \ switch ->
 571         case (indexArray# stuff (tagOf_SimplSwitch switch)) of
 572           LIFT v -> v
 573     }
 574   where
 575     mk_assoc_elem k@(MaxSimplifierIterations lvl)       = IBOX(tagOf_SimplSwitch k) SET_TO SwInt lvl
 576
 577     mk_assoc_elem k = IBOX(tagOf_SimplSwitch k) SET_TO SwBool   True -- I'm here, Mom!
 578
 579     -- cannot have duplicates if we are going to use the array thing
 580     rm_dups switches_so_far switch
 581       = if switch `is_elem` switches_so_far
 582         then switches_so_far
 583         else switch : switches_so_far
 584       where
 585         sw `is_elem` []     = False
 586         sw `is_elem` (s:ss) = (tagOf_SimplSwitch sw) _EQ_ (tagOf_SimplSwitch s)
 587                             || sw `is_elem` ss
 588 \end{code}
 589
 590 Default settings for simplifier switches
 591
 592 \begin{code}
 593 defaultSimplSwitches = [MaxSimplifierIterations         1
 594                        ]
 595 \end{code}
 596
 597 %************************************************************************
 598 %*                                                                      *
 599 \subsection{Misc functions for command-line options}
 600 %*                                                                      *
 601 %************************************************************************
 602
 603
 604 \begin{code}
 605 switchIsOn :: (switch -> SwitchResult) -> switch -> Bool
 606
 607 switchIsOn lookup_fn switch
 608   = case (lookup_fn switch) of
 609       SwBool False -> False
 610       _            -> True
 611
 612 stringSwitchSet :: (switch -> SwitchResult)
 613                 -> (FAST_STRING -> switch)
 614                 -> Maybe FAST_STRING
 615
 616 stringSwitchSet lookup_fn switch
 617   = case (lookup_fn (switch (panic "stringSwitchSet"))) of
 618       SwString str -> Just str
 619       _            -> Nothing
 620
 621 intSwitchSet :: (switch -> SwitchResult)
 622              -> (Int -> switch)
 623              -> Maybe Int
 624
 625 intSwitchSet lookup_fn switch
 626   = case (lookup_fn (switch (panic "intSwitchSet"))) of
 627       SwInt int -> Just int
 628       _         -> Nothing
 629 \end{code}