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