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