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_AllStrict,
  21         opt_AutoSccsOnAllToplevs,
  22         opt_AutoSccsOnExportedToplevs,
  23         opt_AutoSccsOnIndividualCafs,
  24         opt_CompilingGhcInternals,
  25         opt_D_dump_absC,
  26         opt_D_dump_asm,
  27         opt_D_dump_deriv,
  28         opt_D_dump_ds,
  29         opt_D_dump_flatC,
  30         opt_D_dump_occur_anal,
  31         opt_D_dump_rdr,
  32         opt_D_dump_realC,
  33         opt_D_dump_rn,
  34         opt_D_dump_simpl,
  35         opt_D_dump_simpl_iterations,
  36         opt_D_dump_spec,
  37         opt_D_dump_stg,
  38         opt_D_dump_stranal,
  39         opt_D_dump_tc,
  40         opt_D_show_passes,
  41         opt_D_show_rn_trace,
  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_NoImplicitPrelude,
  61         opt_NumbersStrict,
  62         opt_OmitBlackHoling,
  63         opt_OmitInterfacePragmas,
  64         opt_PprStyle_All,
  65         opt_PprStyle_Debug,
  66         opt_PprStyle_User,              -- ToDo: rm
  67         opt_PprUserLength,
  68         opt_ProduceC,
  69         opt_ProduceHi,
  70         opt_ProduceS,
  71         opt_ReportWhyUnfoldingsDisallowed,
  72         opt_ReturnInRegsThreshold,
  73         opt_SccGroup,
  74         opt_SccProfilingOn,
  75         opt_ShowImportSpecs,
  76         opt_SigsRequired,
  77         opt_SourceUnchanged,
  78         opt_SpecialiseAll,
  79         opt_SpecialiseImports,
  80         opt_SpecialiseOverloaded,
  81         opt_SpecialiseTrace,
  82         opt_SpecialiseUnboxed,
  83         opt_StgDoLetNoEscapes,
  84
  85         opt_InterfaceUnfoldThreshold,
  86         opt_UnfoldingCreationThreshold,
  87         opt_UnfoldingConDiscount,
  88         opt_UnfoldingUseThreshold,
  89         opt_UnfoldingKeenessFactor,
  90
  91         opt_Verbose,
  92         opt_WarnNameShadowing,
  93         opt_WarnUnusedNames,
  94         opt_WarnIncompletePatterns, opt_WarnOverlappedPatterns,
  95         opt_WarnMissingMethods,
  96         opt_PruneTyDecls, opt_PruneInstDecls,
  97         opt_D_show_unused_imports,
  98         opt_D_show_rn_stats,
  99
 100         all_toplev_ids_visible
 101     ) where
 102
 103 IMPORT_1_3(Array(array, (//)))
 104 #if defined(__GLASGOW_HASKELL__) && __GLASGOW_HASKELL__ <= 201
 105 import PreludeGlaST     -- bad bad bad boy, Will (_Array internals)
 106 #else
 107 import GlaExts
 108 import ArrBase
 109 -- 2.04 and later exports Lift from GlaExts
 110 #if __GLASGOW_HASKELL__ < 204
 111 import PrelBase (Lift(..))
 112 #endif
 113 #endif
 114
 115 CHK_Ubiq() -- debugging consistency check
 116
 117 import Argv
 118 import Constants        -- Default values for some flags
 119 import Maybes           ( assocMaybe, firstJust, maybeToBool )
 120 import Util             ( startsWith, panic, panic#, assertPanic )
 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   | KeepSpecPragmaIds       -- We normally *toss* Ids we can do without
 214   | KeepUnusedBindings
 215
 216   | SimplNoLetFromCase      -- used when turning off floating entirely
 217   | SimplNoLetFromApp       -- (for experimentation only) WDP 95/10
 218   | SimplNoLetFromStrictLet
 219
 220   | SimplDontFoldBackAppend
 221                         -- we fold `foldr (:)' back into flip (++),
 222                         -- but we *don't* want to do it when compiling
 223                         -- List.hs, otherwise
 224                         -- xs ++ ys = foldr (:) ys xs
 225                         -- {- via our loopback -}
 226                         -- xs ++ ys = xs ++ ys
 227                         -- Oops!
 228                         -- So only use this flag inside List.hs
 229                         -- (Sigh, what a HACK, Andy.  WDP 96/01)
 230
 231   | SimplCaseMerge
 232   | SimplCaseScrutinee  -- This flag tells that the expression being simplified is
 233                         -- the scrutinee of a case expression, so we should
 234                         -- apply the scrutinee discount when considering inlinings.
 235                         -- See SimplVar.lhs
 236 \end{code}
 237
 238 %************************************************************************
 239 %*                                                                      *
 240 \subsection{Classifying command-line options}
 241 %*                                                                      *
 242 %************************************************************************
 243
 244 \begin{code}
 245 lookUp           :: FAST_STRING -> Bool
 246 lookup_int       :: String -> Maybe Int
 247 lookup_def_int   :: String -> Int -> Int
 248 lookup_def_float :: String -> Float -> Float
 249 lookup_str       :: String -> Maybe String
 250
 251 lookUp     sw = maybeToBool (assoc_opts sw)
 252
 253 lookup_str sw = firstJust (map (startsWith sw) unpacked_opts)
 254
 255 lookup_int sw = case (lookup_str sw) of
 256                   Nothing -> Nothing
 257                   Just xx -> Just (read xx)
 258
 259 lookup_def_int sw def = case (lookup_str sw) of
 260                             Nothing -> def              -- Use default
 261                             Just xx -> read xx
 262
 263 lookup_def_float sw def = case (lookup_str sw) of
 264                             Nothing -> def              -- Use default
 265                             Just xx -> read xx
 266
 267 assoc_opts    = assocMaybe [ (a, True) | a <- argv ]
 268 unpacked_opts = map _UNPK_ argv
 269 \end{code}
 270
 271 \begin{code}
 272 opt_AllStrict                   = lookUp  SLIT("-fall-strict")
 273 opt_AutoSccsOnAllToplevs        = lookUp  SLIT("-fauto-sccs-on-all-toplevs")
 274 opt_AutoSccsOnExportedToplevs   = lookUp  SLIT("-fauto-sccs-on-exported-toplevs")
 275 opt_AutoSccsOnIndividualCafs    = lookUp  SLIT("-fauto-sccs-on-individual-cafs")
 276 opt_CompilingGhcInternals       = maybeToBool maybe_CompilingGhcInternals
 277 maybe_CompilingGhcInternals     = lookup_str "-fcompiling-ghc-internals="
 278 opt_D_dump_absC                 = lookUp  SLIT("-ddump-absC")
 279 opt_D_dump_asm                  = lookUp  SLIT("-ddump-asm")
 280 opt_D_dump_deriv                = lookUp  SLIT("-ddump-deriv")
 281 opt_D_dump_ds                   = lookUp  SLIT("-ddump-ds")
 282 opt_D_dump_flatC                = lookUp  SLIT("-ddump-flatC")
 283 opt_D_dump_occur_anal           = lookUp  SLIT("-ddump-occur-anal")
 284 opt_D_dump_rdr                  = lookUp  SLIT("-ddump-rdr")
 285 opt_D_dump_realC                = lookUp  SLIT("-ddump-realC")
 286 opt_D_dump_rn                   = lookUp  SLIT("-ddump-rn")
 287 opt_D_dump_simpl                = lookUp  SLIT("-ddump-simpl")
 288 opt_D_dump_simpl_iterations     = lookUp  SLIT("-ddump-simpl-iterations")
 289 opt_D_dump_spec                 = lookUp  SLIT("-ddump-spec")
 290 opt_D_dump_stg                  = lookUp  SLIT("-ddump-stg")
 291 opt_D_dump_stranal              = lookUp  SLIT("-ddump-stranal")
 292 opt_D_dump_tc                   = lookUp  SLIT("-ddump-tc")
 293 opt_D_show_passes               = lookUp  SLIT("-dshow-passes")
 294 opt_D_show_rn_trace             = lookUp  SLIT("-dshow-rn-trace")
 295 opt_D_simplifier_stats          = lookUp  SLIT("-dsimplifier-stats")
 296 opt_D_source_stats              = lookUp  SLIT("-dsource-stats")
 297 opt_D_verbose_core2core         = lookUp  SLIT("-dverbose-simpl")
 298 opt_D_verbose_stg2stg           = lookUp  SLIT("-dverbose-stg")
 299 opt_DoCoreLinting               = lookUp  SLIT("-dcore-lint")
 300 opt_DoStgLinting                = lookUp  SLIT("-dstg-lint")
 301 opt_DoSemiTagging               = lookUp  SLIT("-fsemi-tagging")
 302 opt_DoTickyProfiling            = lookUp  SLIT("-fticky-ticky")
 303 opt_DoEtaReduction              = lookUp  SLIT("-fdo-eta-reduction")
 304 opt_EnsureSplittableC           = lookUp  SLIT("-fglobalise-toplev-names")
 305 opt_FoldrBuildOn                = lookUp  SLIT("-ffoldr-build-on")
 306 opt_ForConcurrent               = lookUp  SLIT("-fconcurrent")
 307 opt_GranMacros                  = lookUp  SLIT("-fgransim")
 308 opt_GlasgowExts                 = lookUp  SLIT("-fglasgow-exts")
 309 --UNUSED:opt_Haskell_1_3        = lookUp  SLIT("-fhaskell-1.3")
 310 opt_HiMap                       = lookup_str "-himap="  -- file saying where to look for .hi files
 311 opt_IgnoreIfacePragmas          = lookUp  SLIT("-fignore-interface-pragmas")
 312 opt_IrrefutableTuples           = lookUp  SLIT("-firrefutable-tuples")
 313 opt_NoImplicitPrelude           = lookUp  SLIT("-fno-implicit-prelude")
 314 opt_NumbersStrict               = lookUp  SLIT("-fnumbers-strict")
 315 opt_OmitBlackHoling             = lookUp  SLIT("-dno-black-holing")
 316 opt_OmitInterfacePragmas        = lookUp  SLIT("-fomit-interface-pragmas")
 317 opt_PprStyle_All                = lookUp  SLIT("-dppr-all")
 318 opt_PprStyle_Debug              = lookUp  SLIT("-dppr-debug")
 319 opt_PprStyle_User               = lookUp  SLIT("-dppr-user")
 320 opt_PprUserLength               = lookup_def_int "-dppr-user-length" 5 --ToDo: give this a name
 321 opt_ProduceC                    = lookup_str "-C="
 322 opt_ProduceS                    = lookup_str "-S="
 323 opt_ProduceHi                   = lookup_str "-hifile=" -- the one to produce this time
 324 opt_ReportWhyUnfoldingsDisallowed= lookUp SLIT("-freport-disallowed-unfoldings")
 325 opt_SccProfilingOn              = lookUp  SLIT("-fscc-profiling")
 326 opt_ShowImportSpecs             = lookUp  SLIT("-fshow-import-specs")
 327 opt_SigsRequired                = lookUp  SLIT("-fsignatures-required")
 328 opt_SourceUnchanged             = lookUp  SLIT("-fsource-unchanged")
 329 opt_SpecialiseAll               = lookUp  SLIT("-fspecialise-all")
 330 opt_SpecialiseImports           = lookUp  SLIT("-fspecialise-imports")
 331 opt_SpecialiseOverloaded        = lookUp  SLIT("-fspecialise-overloaded")
 332 opt_SpecialiseTrace             = lookUp  SLIT("-ftrace-specialisation")
 333 opt_SpecialiseUnboxed           = lookUp  SLIT("-fspecialise-unboxed")
 334 opt_StgDoLetNoEscapes           = lookUp  SLIT("-flet-no-escape")
 335 opt_ReturnInRegsThreshold       = lookup_int "-freturn-in-regs-threshold"
 336 opt_SccGroup                    = lookup_str "-G="
 337 opt_Verbose                     = lookUp  SLIT("-v")
 338
 339 opt_InterfaceUnfoldThreshold    = lookup_def_int "-funfolding-interface-threshold" iNTERFACE_UNFOLD_THRESHOLD
 340 opt_UnfoldingCreationThreshold  = lookup_def_int "-funfolding-creation-threshold"  uNFOLDING_CREATION_THRESHOLD
 341 opt_UnfoldingUseThreshold       = lookup_def_int "-funfolding-use-threshold"       uNFOLDING_USE_THRESHOLD
 342 opt_UnfoldingConDiscount        = lookup_def_int "-funfolding-con-discount"        uNFOLDING_CON_DISCOUNT_WEIGHT
 343
 344 opt_LiberateCaseThreshold       = lookup_def_int "-fliberate-case-threshold"       lIBERATE_CASE_THRESHOLD
 345 opt_UnfoldingKeenessFactor      = lookup_def_float "-funfolding-keeness-factor"    uNFOLDING_KEENESS_FACTOR
 346 opt_WarnNameShadowing           = lookUp  SLIT("-fwarn-name-shadowing")
 347 opt_WarnIncompletePatterns      = lookUp  SLIT("-fwarn-incomplete-patterns")
 348 opt_WarnOverlappedPatterns      = lookUp  SLIT("-fwarn-overlapped-patterns")
 349 opt_WarnUnusedNames             = lookUp  SLIT("-fwarn-unused-names")
 350 opt_WarnMissingMethods          = lookUp  SLIT("-fwarn-missing-methods")
 351 opt_PruneTyDecls                = not (lookUp SLIT("-fno-prune-tydecls"))
 352 opt_PruneInstDecls              = not (lookUp SLIT("-fno-prune-instdecls"))
 353 opt_D_show_unused_imports       = lookUp SLIT("-dshow-unused-imports")
 354 opt_D_show_rn_stats             = lookUp SLIT("-dshow-rn-stats")
 355
 356 -- opt_UnfoldingOverrideThreshold       = lookup_int "-funfolding-override-threshold"
 357 \end{code}
 358
 359
 360 \begin{code}
 361 all_toplev_ids_visible :: Bool
 362 all_toplev_ids_visible =
 363   not opt_OmitInterfacePragmas ||  -- Pragmas can make them visible
 364   opt_EnsureSplittableC        ||  -- Splitting requires visiblilty
 365   opt_AutoSccsOnAllToplevs         -- ditto for profiling
 366                                    -- (ToDo: fix up the auto-annotation
 367                                    -- pass in the desugarer to avoid having
 368                                    -- to do this)
 369
 370 \end{code}
 371
 372
 373
 374 \begin{code}
 375 classifyOpts :: ([CoreToDo],    -- Core-to-Core processing spec
 376                  [StgToDo])     -- STG-to-STG   processing spec
 377
 378 classifyOpts = sep argv [] [] -- accumulators...
 379   where
 380     sep :: [FAST_STRING]                         -- cmd-line opts (input)
 381         -> [CoreToDo] -> [StgToDo]       -- to_do accumulators
 382         -> ([CoreToDo], [StgToDo])       -- result
 383
 384     sep [] core_td stg_td -- all done!
 385       = (reverse core_td, reverse stg_td)
 386
 387 #       define CORE_TD(to_do) sep opts (to_do:core_td) stg_td
 388 #       define STG_TD(to_do)  sep opts core_td (to_do:stg_td)
 389 #       define IGNORE_ARG()   sep opts core_td stg_td
 390
 391     sep (opt1:opts) core_td stg_td
 392       =
 393         case (_UNPK_ opt1) of -- the non-"just match a string" options are at the end...
 394
 395           ',' : _       -> IGNORE_ARG() -- it is for the parser
 396
 397           "-fsimplify"  -> -- gather up SimplifierSwitches specially...
 398                            simpl_sep opts defaultSimplSwitches core_td stg_td
 399
 400           "-fcalc-inlinings1"-> CORE_TD(CoreDoCalcInlinings1)
 401           "-fcalc-inlinings2"-> CORE_TD(CoreDoCalcInlinings2)
 402           "-ffloat-inwards"  -> CORE_TD(CoreDoFloatInwards)
 403           "-ffull-laziness"  -> CORE_TD(CoreDoFullLaziness)
 404           "-fliberate-case"  -> CORE_TD(CoreLiberateCase)
 405           "-fprint-core"     -> CORE_TD(CoreDoPrintCore)
 406           "-fstatic-args"    -> CORE_TD(CoreDoStaticArgs)
 407           "-fstrictness"     -> CORE_TD(CoreDoStrictness)
 408           "-fspecialise"     -> CORE_TD(CoreDoSpecialising)
 409           "-ffoldr-build-worker-wrapper"  -> CORE_TD(CoreDoFoldrBuildWorkerWrapper)
 410           "-ffoldr-build-ww-anal"  -> CORE_TD(CoreDoFoldrBuildWWAnal)
 411
 412           "-fstg-static-args" -> STG_TD(StgDoStaticArgs)
 413           "-fupdate-analysis" -> STG_TD(StgDoUpdateAnalysis)
 414           "-dstg-stats"       -> STG_TD(D_stg_stats)
 415           "-flambda-lift"     -> STG_TD(StgDoLambdaLift)
 416           "-fmassage-stg-for-profiling" -> STG_TD(StgDoMassageForProfiling)
 417
 418           _ -> -- NB: the driver is really supposed to handle bad options
 419                IGNORE_ARG()
 420
 421     ----------------
 422
 423     simpl_sep :: [FAST_STRING]      -- cmd-line opts (input)
 424         -> [SimplifierSwitch]       -- simplifier-switch accumulator
 425         -> [CoreToDo] -> [StgToDo]  -- to_do accumulators
 426         -> ([CoreToDo], [StgToDo])  -- result
 427
 428         -- "simpl_sep" tailcalls "sep" once it's seen one set
 429         -- of SimplifierSwitches for a CoreDoSimplify.
 430
 431 #ifdef DEBUG
 432     simpl_sep input@[] simpl_sw core_td stg_td
 433       = panic "simpl_sep []"
 434 #endif
 435
 436         -- The SimplifierSwitches should be delimited by "[" and "]".
 437
 438     simpl_sep (opt1:opts) simpl_sw core_td stg_td
 439       = case (_UNPK_ opt1) of
 440           "[" -> simpl_sep opts simpl_sw core_td stg_td
 441           "]" -> let
 442                     this_simpl = CoreDoSimplify (isAmongSimpl simpl_sw)
 443                  in
 444                  sep opts (this_simpl : core_td) stg_td
 445
 446 #         define SIMPL_SW(sw) simpl_sep opts (sw:simpl_sw) core_td stg_td
 447
 448           -- the non-"just match a string" options are at the end...
 449           "-fshow-simplifier-progress"      -> SIMPL_SW(ShowSimplifierProgress)
 450           "-fcode-duplication-ok"           -> SIMPL_SW(SimplOkToDupCode)
 451           "-ffloat-lets-exposing-whnf"      -> SIMPL_SW(SimplFloatLetsExposingWHNF)
 452           "-ffloat-primops-ok"              -> SIMPL_SW(SimplOkToFloatPrimOps)
 453           "-falways-float-lets-from-lets"   -> SIMPL_SW(SimplAlwaysFloatLetsFromLets)
 454           "-fdo-case-elim"                  -> SIMPL_SW(SimplDoCaseElim)
 455           "-fdo-lambda-eta-expansion"       -> SIMPL_SW(SimplDoLambdaEtaExpansion)
 456           "-fdo-foldr-build"                -> SIMPL_SW(SimplDoFoldrBuild)
 457           "-fdo-not-fold-back-append"       -> SIMPL_SW(SimplDontFoldBackAppend)
 458           "-fdo-arity-expand"               -> SIMPL_SW(SimplDoArityExpand)
 459           "-fdo-inline-foldr-build"         -> SIMPL_SW(SimplDoInlineFoldrBuild)
 460           "-freuse-con"                     -> SIMPL_SW(SimplReuseCon)
 461           "-fcase-of-case"                  -> SIMPL_SW(SimplCaseOfCase)
 462           "-fcase-merge"                    -> SIMPL_SW(SimplCaseMerge)
 463           "-flet-to-case"                   -> SIMPL_SW(SimplLetToCase)
 464           "-fpedantic-bottoms"              -> SIMPL_SW(SimplPedanticBottoms)
 465           "-fkeep-spec-pragma-ids"          -> SIMPL_SW(KeepSpecPragmaIds)
 466           "-fkeep-unused-bindings"          -> SIMPL_SW(KeepUnusedBindings)
 467           "-fmay-delete-conjurable-ids"     -> SIMPL_SW(SimplMayDeleteConjurableIds)
 468           "-fessential-unfoldings-only"     -> SIMPL_SW(EssentialUnfoldingsOnly)
 469           "-fignore-inline-pragma"          -> SIMPL_SW(IgnoreINLINEPragma)
 470           "-fno-let-from-case"              -> SIMPL_SW(SimplNoLetFromCase)
 471           "-fno-let-from-app"               -> SIMPL_SW(SimplNoLetFromApp)
 472           "-fno-let-from-strict-let"        -> SIMPL_SW(SimplNoLetFromStrictLet)
 473
 474           o | starts_with_msi  -> SIMPL_SW(MaxSimplifierIterations (read after_msi))
 475            where
 476             maybe_msi           = startsWith "-fmax-simplifier-iterations"   o
 477             starts_with_msi     = maybeToBool maybe_msi
 478             (Just after_msi)    = maybe_msi
 479
 480           _ -> -- NB: the driver is really supposed to handle bad options
 481                simpl_sep opts simpl_sw core_td stg_td
 482 \end{code}
 483
 484 %************************************************************************
 485 %*                                                                      *
 486 \subsection{Switch ordering}
 487 %*                                                                      *
 488 %************************************************************************
 489
 490 In spite of the @Produce*@ and @SccGroup@ constructors, these things
 491 behave just like enumeration types.
 492
 493 \begin{code}
 494 instance Eq SimplifierSwitch where
 495     a == b = tagOf_SimplSwitch a _EQ_ tagOf_SimplSwitch b
 496
 497 instance Ord SimplifierSwitch where
 498     a <  b  = tagOf_SimplSwitch a _LT_ tagOf_SimplSwitch b
 499     a <= b  = tagOf_SimplSwitch a _LE_ tagOf_SimplSwitch b
 500
 501 tagOf_SimplSwitch SimplOkToDupCode              =(ILIT(0) :: FAST_INT)
 502 tagOf_SimplSwitch SimplFloatLetsExposingWHNF    = ILIT(1)
 503 tagOf_SimplSwitch SimplOkToFloatPrimOps         = ILIT(2)
 504 tagOf_SimplSwitch SimplAlwaysFloatLetsFromLets  = ILIT(3)
 505 tagOf_SimplSwitch SimplDoCaseElim               = ILIT(4)
 506 tagOf_SimplSwitch SimplReuseCon                 = ILIT(5)
 507 tagOf_SimplSwitch SimplCaseOfCase               = ILIT(6)
 508 tagOf_SimplSwitch SimplLetToCase                = ILIT(7)
 509 tagOf_SimplSwitch SimplMayDeleteConjurableIds   = ILIT(9)
 510 tagOf_SimplSwitch SimplPedanticBottoms          = ILIT(10)
 511 tagOf_SimplSwitch SimplDoArityExpand            = ILIT(11)
 512 tagOf_SimplSwitch SimplDoFoldrBuild             = ILIT(12)
 513 tagOf_SimplSwitch SimplDoInlineFoldrBuild       = ILIT(14)
 514 tagOf_SimplSwitch IgnoreINLINEPragma            = ILIT(15)
 515 tagOf_SimplSwitch SimplDoLambdaEtaExpansion     = ILIT(16)
 516 tagOf_SimplSwitch EssentialUnfoldingsOnly       = ILIT(19)
 517 tagOf_SimplSwitch ShowSimplifierProgress        = ILIT(20)
 518 tagOf_SimplSwitch (MaxSimplifierIterations _)   = ILIT(21)
 519 tagOf_SimplSwitch KeepSpecPragmaIds             = ILIT(25)
 520 tagOf_SimplSwitch KeepUnusedBindings            = ILIT(26)
 521 tagOf_SimplSwitch SimplNoLetFromCase            = ILIT(27)
 522 tagOf_SimplSwitch SimplNoLetFromApp             = ILIT(28)
 523 tagOf_SimplSwitch SimplNoLetFromStrictLet       = ILIT(29)
 524 tagOf_SimplSwitch SimplDontFoldBackAppend       = ILIT(30)
 525 tagOf_SimplSwitch SimplCaseMerge                = ILIT(31)
 526 tagOf_SimplSwitch SimplCaseScrutinee            = ILIT(32)
 527
 528 -- If you add anything here, be sure to change lAST_SIMPL_SWITCH_TAG, too!
 529
 530 tagOf_SimplSwitch _ = panic# "tagOf_SimplSwitch"
 531
 532 lAST_SIMPL_SWITCH_TAG = IBOX(tagOf_SimplSwitch SimplCaseScrutinee)
 533 \end{code}
 534
 535 %************************************************************************
 536 %*                                                                      *
 537 \subsection{Switch lookup}
 538 %*                                                                      *
 539 %************************************************************************
 540
 541 \begin{code}
 542 #if __GLASGOW_HASKELL__ == 201
 543 # define ARRAY      Array
 544 # define LIFT       GHCbase.Lift
 545 # define SET_TO     =:
 546 (=:) a b = (a,b)
 547 #elif __GLASGOW_HASKELL__ >= 202
 548 # define ARRAY      Array
 549 # define LIFT       Lift
 550 # define SET_TO     =:
 551 (=:) a b = (a,b)
 552 #else
 553 # define ARRAY      _Array
 554 # define LIFT       _Lift
 555 # define SET_TO     :=
 556 #endif
 557
 558 isAmongSimpl :: [SimplifierSwitch] -> SimplifierSwitch -> SwitchResult
 559
 560 isAmongSimpl on_switches                -- Switches mentioned later occur *earlier*
 561                                         -- in the list; defaults right at the end.
 562   = let
 563         tidied_on_switches = foldl rm_dups [] on_switches
 564                 -- The fold*l* ensures that we keep the latest switches;
 565                 -- ie the ones that occur earliest in the list.
 566
 567         sw_tbl :: Array Int SwitchResult
 568
 569         sw_tbl = (array (0, lAST_SIMPL_SWITCH_TAG) -- bounds...
 570                         all_undefined)
 571                  // defined_elems
 572
 573         all_undefined = [ i SET_TO SwBool False | i <- [0 .. lAST_SIMPL_SWITCH_TAG ] ]
 574
 575         defined_elems = map mk_assoc_elem tidied_on_switches
 576     in
 577     -- (avoid some unboxing, bounds checking, and other horrible things:)
 578     case sw_tbl of { ARRAY bounds_who_needs_'em stuff ->
 579     \ switch ->
 580         case (indexArray# stuff (tagOf_SimplSwitch switch)) of
 581           LIFT v -> v
 582     }
 583   where
 584     mk_assoc_elem k@(MaxSimplifierIterations lvl)       = IBOX(tagOf_SimplSwitch k) SET_TO SwInt lvl
 585
 586     mk_assoc_elem k = IBOX(tagOf_SimplSwitch k) SET_TO SwBool   True -- I'm here, Mom!
 587
 588     -- cannot have duplicates if we are going to use the array thing
 589     rm_dups switches_so_far switch
 590       = if switch `is_elem` switches_so_far
 591         then switches_so_far
 592         else switch : switches_so_far
 593       where
 594         sw `is_elem` []     = False
 595         sw `is_elem` (s:ss) = (tagOf_SimplSwitch sw) _EQ_ (tagOf_SimplSwitch s)
 596                             || sw `is_elem` ss
 597 \end{code}
 598
 599 Default settings for simplifier switches
 600
 601 \begin{code}
 602 defaultSimplSwitches = [MaxSimplifierIterations         1
 603                        ]
 604 \end{code}
 605
 606 %************************************************************************
 607 %*                                                                      *
 608 \subsection{Misc functions for command-line options}
 609 %*                                                                      *
 610 %************************************************************************
 611
 612
 613 \begin{code}
 614 switchIsOn :: (switch -> SwitchResult) -> switch -> Bool
 615
 616 switchIsOn lookup_fn switch
 617   = case (lookup_fn switch) of
 618       SwBool False -> False
 619       _            -> True
 620
 621 stringSwitchSet :: (switch -> SwitchResult)
 622                 -> (FAST_STRING -> switch)
 623                 -> Maybe FAST_STRING
 624
 625 stringSwitchSet lookup_fn switch
 626   = case (lookup_fn (switch (panic "stringSwitchSet"))) of
 627       SwString str -> Just str
 628       _            -> Nothing
 629
 630 intSwitchSet :: (switch -> SwitchResult)
 631              -> (Int -> switch)
 632              -> Maybe Int
 633
 634 intSwitchSet lookup_fn switch
 635   = case (lookup_fn (switch (panic "intSwitchSet"))) of
 636       SwInt int -> Just int
 637       _         -> Nothing
 638 \end{code}