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