ghc/compiler/main/CmdLineOpts.lhs

   1 %
   2 % (c) The AQUA Project, Glasgow University, 1996
   3 %
   4 \section[CmdLineOpts]{Things to do with command-line options}
   5
   6 \begin{code}
   7 #include "HsVersions.h"
   8
   9 module CmdLineOpts (
  10         CoreToDo(..),
  11         SimplifierSwitch(..),
  12         StgToDo(..),
  13         SwitchResult(..),
  14         classifyOpts,
  15
  16         intSwitchSet,
  17         switchIsOn,
  18
  19         maybe_CompilingGhcInternals,
  20         opt_AllDemanded,
  21         opt_AllStrict,
  22         opt_AutoSccsOnAllToplevs,
  23         opt_AutoSccsOnExportedToplevs,
  24         opt_AutoSccsOnIndividualCafs,
  25         opt_CompilingGhcInternals,
  26         opt_D_dump_absC,
  27         opt_D_dump_asm,
  28         opt_D_dump_deforest,
  29         opt_D_dump_deriv,
  30         opt_D_dump_ds,
  31         opt_D_dump_flatC,
  32         opt_D_dump_occur_anal,
  33         opt_D_dump_rdr,
  34         opt_D_dump_realC,
  35         opt_D_dump_rn,
  36         opt_D_dump_simpl,
  37         opt_D_dump_spec,
  38         opt_D_dump_stg,
  39         opt_D_dump_stranal,
  40         opt_D_dump_tc,
  41         opt_D_show_passes,
  42         opt_D_show_rn_trace,
  43         opt_D_simplifier_stats,
  44         opt_D_source_stats,
  45         opt_D_verbose_core2core,
  46         opt_D_verbose_stg2stg,
  47         opt_DoCoreLinting,
  48         opt_DoSemiTagging,
  49         opt_DoEtaReduction,
  50         opt_DoTickyProfiling,
  51         opt_EnsureSplittableC,
  52         opt_FoldrBuildOn,
  53         opt_FoldrBuildTrace,
  54         opt_ForConcurrent,
  55         opt_GlasgowExts,
  56         opt_GranMacros,
  57         opt_Haskell_1_3,
  58         opt_HiMap,
  59         opt_IgnoreIfacePragmas,
  60         opt_IgnoreStrictnessPragmas,
  61         opt_IrrefutableEverything,
  62         opt_IrrefutableTuples,
  63         opt_LiberateCaseThreshold,
  64         opt_NoImplicitPrelude,
  65         opt_NumbersStrict,
  66         opt_OmitBlackHoling,
  67         opt_OmitDefaultInstanceMethods,
  68         opt_OmitInterfacePragmas,
  69         opt_PprStyle_All,
  70         opt_PprStyle_Debug,
  71         opt_PprStyle_User,
  72         opt_ProduceC,
  73         opt_ProduceHi,
  74         opt_ProduceS,
  75         opt_ReportWhyUnfoldingsDisallowed,
  76         opt_ReturnInRegsThreshold,
  77         opt_SccGroup,
  78         opt_SccProfilingOn,
  79         opt_ShowImportSpecs,
  80         opt_ShowPragmaNameErrs,
  81         opt_SigsRequired,
  82         opt_SourceUnchanged,
  83         opt_SpecialiseAll,
  84         opt_SpecialiseImports,
  85         opt_SpecialiseOverloaded,
  86         opt_SpecialiseTrace,
  87         opt_SpecialiseUnboxed,
  88         opt_StgDoLetNoEscapes,
  89
  90         opt_InterfaceUnfoldThreshold,
  91         opt_UnfoldingCreationThreshold,
  92         opt_UnfoldingConDiscount,
  93         opt_UnfoldingUseThreshold,
  94
  95         opt_Verbose,
  96         opt_WarnNameShadowing
  97     ) where
  98
  99 IMPORT_1_3(Array(array, (//)))
 100 import PreludeGlaST     -- bad bad bad boy, Will (_Array internals)
 101 import Argv
 102
 103 CHK_Ubiq() -- debugging consistency check
 104
 105 import Constants        -- Default values for some flags
 106
 107 import Maybes           ( assocMaybe, firstJust, maybeToBool )
 108 import Util             ( startsWith, panic, panic#, assertPanic )
 109 \end{code}
 110
 111 A command-line {\em switch} is (generally) either on or off; e.g., the
 112 ``verbose'' (-v) switch is either on or off.  (The \tr{-G<group>}
 113 switch is an exception; it's set to a string, or nothing.)
 114
 115 A list of {\em ToDo}s is things to be done in a particular part of
 116 processing.  A (fictitious) example for the Core-to-Core simplifier
 117 might be: run the simplifier, then run the strictness analyser, then
 118 run the simplifier again (three ``todos'').
 119
 120 There are three ``to-do processing centers'' at the moment.  In the
 121 main loop (\tr{main/Main.lhs}), in the Core-to-Core processing loop
 122 (\tr{simplCore/SimplCore.lhs), and in the STG-to-STG processing loop
 123 (\tr{simplStg/SimplStg.lhs}).
 124
 125 %************************************************************************
 126 %*                                                                      *
 127 \subsection{Datatypes associated with command-line options}
 128 %*                                                                      *
 129 %************************************************************************
 130
 131 \begin{code}
 132 data SwitchResult
 133   = SwBool      Bool            -- on/off
 134   | SwString    FAST_STRING     -- nothing or a String
 135   | SwInt       Int             -- nothing or an Int
 136 \end{code}
 137
 138 \begin{code}
 139 data CoreToDo           -- These are diff core-to-core passes,
 140                         -- which may be invoked in any order,
 141                         -- as many times as you like.
 142
 143   = CoreDoSimplify      -- The core-to-core simplifier.
 144         (SimplifierSwitch -> SwitchResult)
 145                         -- Each run of the simplifier can take a different
 146                         -- set of simplifier-specific flags.
 147   | CoreDoCalcInlinings1
 148   | CoreDoCalcInlinings2
 149   | CoreDoFloatInwards
 150   | CoreDoFullLaziness
 151   | CoreLiberateCase
 152   | CoreDoPrintCore
 153   | CoreDoStaticArgs
 154   | CoreDoStrictness
 155   | CoreDoSpecialising
 156   | CoreDoDeforest
 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 \end{code}
 222
 223 %************************************************************************
 224 %*                                                                      *
 225 \subsection{Classifying command-line options}
 226 %*                                                                      *
 227 %************************************************************************
 228
 229 \begin{code}
 230 lookUp         :: FAST_STRING -> Bool
 231 lookup_int     :: String -> Maybe Int
 232 lookup_def_int :: String -> Int -> Int
 233 lookup_str     :: String -> Maybe String
 234
 235 lookUp     sw = maybeToBool (assoc_opts sw)
 236
 237 lookup_str sw = firstJust (map (startsWith sw) unpacked_opts)
 238
 239 lookup_int sw = case (lookup_str sw) of
 240                   Nothing -> Nothing
 241                   Just xx -> Just (read xx)
 242
 243 lookup_def_int sw def = case (lookup_str sw) of
 244                             Nothing -> def              -- Use default
 245                             Just xx -> read xx
 246
 247 assoc_opts    = assocMaybe [ (a, True) | a <- argv ]
 248 unpacked_opts = map _UNPK_ argv
 249 \end{code}
 250
 251 \begin{code}
 252 opt_AllDemanded                 = lookUp  SLIT("-fall-demanded")
 253 opt_AllStrict                   = lookUp  SLIT("-fall-strict")
 254 opt_AutoSccsOnAllToplevs        = lookUp  SLIT("-fauto-sccs-on-all-toplevs")
 255 opt_AutoSccsOnExportedToplevs   = lookUp  SLIT("-fauto-sccs-on-exported-toplevs")
 256 opt_AutoSccsOnIndividualCafs    = lookUp  SLIT("-fauto-sccs-on-individual-cafs")
 257 opt_CompilingGhcInternals       = maybeToBool maybe_CompilingGhcInternals
 258 maybe_CompilingGhcInternals     = lookup_str "-fcompiling-ghc-internals="
 259 opt_D_dump_absC                 = lookUp  SLIT("-ddump-absC")
 260 opt_D_dump_asm                  = lookUp  SLIT("-ddump-asm")
 261 opt_D_dump_deforest             = lookUp  SLIT("-ddump-deforest")
 262 opt_D_dump_deriv                = lookUp  SLIT("-ddump-deriv")
 263 opt_D_dump_ds                   = lookUp  SLIT("-ddump-ds")
 264 opt_D_dump_flatC                = lookUp  SLIT("-ddump-flatC")
 265 opt_D_dump_occur_anal           = lookUp  SLIT("-ddump-occur-anal")
 266 opt_D_dump_rdr                  = lookUp  SLIT("-ddump-rdr")
 267 opt_D_dump_realC                = lookUp  SLIT("-ddump-realC")
 268 opt_D_dump_rn                   = lookUp  SLIT("-ddump-rn")
 269 opt_D_dump_simpl                = lookUp  SLIT("-ddump-simpl")
 270 opt_D_dump_spec                 = lookUp  SLIT("-ddump-spec")
 271 opt_D_dump_stg                  = lookUp  SLIT("-ddump-stg")
 272 opt_D_dump_stranal              = lookUp  SLIT("-ddump-stranal")
 273 opt_D_dump_tc                   = lookUp  SLIT("-ddump-tc")
 274 opt_D_show_passes               = lookUp  SLIT("-dshow-passes")
 275 opt_D_show_rn_trace             = lookUp  SLIT("-dshow-rn-trace")
 276 opt_D_simplifier_stats          = lookUp  SLIT("-dsimplifier-stats")
 277 opt_D_source_stats              = lookUp  SLIT("-dsource-stats")
 278 opt_D_verbose_core2core         = lookUp  SLIT("-dverbose-simpl")
 279 opt_D_verbose_stg2stg           = lookUp  SLIT("-dverbose-stg")
 280 opt_DoCoreLinting               = lookUp  SLIT("-dcore-lint")
 281 opt_DoSemiTagging               = lookUp  SLIT("-fsemi-tagging")
 282 opt_DoTickyProfiling            = lookUp  SLIT("-fticky-ticky")
 283 opt_DoEtaReduction              = lookUp  SLIT("-fdo-eta-reduction")
 284 opt_EnsureSplittableC           = lookUp  SLIT("-fglobalise-toplev-names")
 285 opt_FoldrBuildOn                = lookUp  SLIT("-ffoldr-build-on")
 286 opt_FoldrBuildTrace             = lookUp  SLIT("-ffoldr-build-trace")
 287 opt_ForConcurrent               = lookUp  SLIT("-fconcurrent")
 288 opt_GranMacros                  = lookUp  SLIT("-fgransim")
 289 opt_GlasgowExts                 = lookUp  SLIT("-fglasgow-exts")
 290 opt_Haskell_1_3                 = lookUp  SLIT("-fhaskell-1.3")
 291 opt_HiMap                       = lookup_str "-himap="  -- file saying where to look for .hi files
 292 opt_IgnoreIfacePragmas          = lookUp  SLIT("-fignore-interface-pragmas")
 293 opt_IgnoreStrictnessPragmas     = lookUp  SLIT("-fignore-strictness-pragmas")
 294 opt_IrrefutableEverything       = lookUp  SLIT("-firrefutable-everything")
 295 opt_IrrefutableTuples           = lookUp  SLIT("-firrefutable-tuples")
 296 opt_NoImplicitPrelude           = lookUp  SLIT("-fno-implicit-prelude")
 297 opt_NumbersStrict               = lookUp  SLIT("-fnumbers-strict")
 298 opt_OmitBlackHoling             = lookUp  SLIT("-dno-black-holing")
 299 opt_OmitDefaultInstanceMethods  = lookUp  SLIT("-fomit-default-instance-methods")
 300 opt_OmitInterfacePragmas        = lookUp  SLIT("-fomit-interface-pragmas")
 301 opt_PprStyle_All                = lookUp  SLIT("-dppr-all")
 302 opt_PprStyle_Debug              = lookUp  SLIT("-dppr-debug")
 303 opt_PprStyle_User               = lookUp  SLIT("-dppr-user")
 304 opt_ProduceC                    = lookup_str "-C="
 305 opt_ProduceS                    = lookup_str "-S="
 306 opt_ProduceHi                   = lookup_str "-hifile=" -- the one to produce this time
 307 opt_ReportWhyUnfoldingsDisallowed= lookUp SLIT("-freport-disallowed-unfoldings")
 308 opt_SccProfilingOn              = lookUp  SLIT("-fscc-profiling")
 309 opt_ShowImportSpecs             = lookUp  SLIT("-fshow-import-specs")
 310 opt_ShowPragmaNameErrs          = lookUp  SLIT("-fshow-pragma-name-errs")
 311 opt_SigsRequired                = lookUp  SLIT("-fsignatures-required")
 312 opt_SourceUnchanged             = lookUp  SLIT("-fsource-unchanged")
 313 opt_SpecialiseAll               = lookUp  SLIT("-fspecialise-all")
 314 opt_SpecialiseImports           = lookUp  SLIT("-fspecialise-imports")
 315 opt_SpecialiseOverloaded        = lookUp  SLIT("-fspecialise-overloaded")
 316 opt_SpecialiseTrace             = lookUp  SLIT("-ftrace-specialisation")
 317 opt_SpecialiseUnboxed           = lookUp  SLIT("-fspecialise-unboxed")
 318 opt_StgDoLetNoEscapes           = lookUp  SLIT("-flet-no-escape")
 319 opt_ReturnInRegsThreshold       = lookup_int "-freturn-in-regs-threshold"
 320 opt_SccGroup                    = lookup_str "-G="
 321 opt_Verbose                     = lookUp  SLIT("-v")
 322
 323 opt_InterfaceUnfoldThreshold    = lookup_def_int "-funfolding-interface-threshold" iNTERFACE_UNFOLD_THRESHOLD
 324 opt_UnfoldingCreationThreshold  = lookup_def_int "-funfolding-creation-threshold"  uNFOLDING_CREATION_THRESHOLD
 325 opt_UnfoldingUseThreshold       = lookup_def_int "-funfolding-use-threshold"       uNFOLDING_USE_THRESHOLD
 326 opt_UnfoldingConDiscount        = lookup_def_int "-funfolding-con-discount"        uNFOLDING_CON_DISCOUNT_WEIGHT
 327
 328 opt_LiberateCaseThreshold       = lookup_def_int "-fliberate-case-threshold"       lIBERATE_CASE_THRESHOLD
 329 opt_WarnNameShadowing           = lookUp  SLIT("-fwarn-name-shadowing")
 330
 331 -- opt_UnfoldingUseThreshold    = lookup_int "-funfolding-use-threshold"
 332 -- opt_UnfoldingOverrideThreshold       = lookup_int "-funfolding-override-threshold"
 333 \end{code}
 334
 335 \begin{code}
 336 classifyOpts :: ([CoreToDo],    -- Core-to-Core processing spec
 337                  [StgToDo])     -- STG-to-STG   processing spec
 338
 339 classifyOpts = sep argv [] [] -- accumulators...
 340   where
 341     sep :: [FAST_STRING]                         -- cmd-line opts (input)
 342         -> [CoreToDo] -> [StgToDo]       -- to_do accumulators
 343         -> ([CoreToDo], [StgToDo])       -- result
 344
 345     sep [] core_td stg_td -- all done!
 346       = (reverse core_td, reverse stg_td)
 347
 348 #       define CORE_TD(to_do) sep opts (to_do:core_td) stg_td
 349 #       define STG_TD(to_do)  sep opts core_td (to_do:stg_td)
 350 #       define IGNORE_ARG()   sep opts core_td stg_td
 351
 352     sep (opt1:opts) core_td stg_td
 353       =
 354         case (_UNPK_ opt1) of -- the non-"just match a string" options are at the end...
 355
 356           ',' : _       -> IGNORE_ARG() -- it is for the parser
 357
 358           "-fsimplify"  -> -- gather up SimplifierSwitches specially...
 359                            simpl_sep opts defaultSimplSwitches core_td stg_td
 360
 361           "-fcalc-inlinings1"-> CORE_TD(CoreDoCalcInlinings1)
 362           "-fcalc-inlinings2"-> CORE_TD(CoreDoCalcInlinings2)
 363           "-ffloat-inwards"  -> CORE_TD(CoreDoFloatInwards)
 364           "-ffull-laziness"  -> CORE_TD(CoreDoFullLaziness)
 365           "-fliberate-case"  -> CORE_TD(CoreLiberateCase)
 366           "-fprint-core"     -> CORE_TD(CoreDoPrintCore)
 367           "-fstatic-args"    -> CORE_TD(CoreDoStaticArgs)
 368           "-fstrictness"     -> CORE_TD(CoreDoStrictness)
 369           "-fspecialise"     -> CORE_TD(CoreDoSpecialising)
 370           "-fdeforest"       -> CORE_TD(CoreDoDeforest)
 371           "-ffoldr-build-worker-wrapper"  -> CORE_TD(CoreDoFoldrBuildWorkerWrapper)
 372           "-ffoldr-build-ww-anal"  -> CORE_TD(CoreDoFoldrBuildWWAnal)
 373
 374           "-fstg-static-args" -> STG_TD(StgDoStaticArgs)
 375           "-fupdate-analysis" -> STG_TD(StgDoUpdateAnalysis)
 376           "-dstg-stats"       -> STG_TD(D_stg_stats)
 377           "-flambda-lift"     -> STG_TD(StgDoLambdaLift)
 378           "-fmassage-stg-for-profiling" -> STG_TD(StgDoMassageForProfiling)
 379
 380           _ -> -- NB: the driver is really supposed to handle bad options
 381                IGNORE_ARG()
 382
 383     ----------------
 384
 385     simpl_sep :: [FAST_STRING]      -- cmd-line opts (input)
 386         -> [SimplifierSwitch]       -- simplifier-switch accumulator
 387         -> [CoreToDo] -> [StgToDo]  -- to_do accumulators
 388         -> ([CoreToDo], [StgToDo])  -- result
 389
 390         -- "simpl_sep" tailcalls "sep" once it's seen one set
 391         -- of SimplifierSwitches for a CoreDoSimplify.
 392
 393 #ifdef DEBUG
 394     simpl_sep input@[] simpl_sw core_td stg_td
 395       = panic "simpl_sep []"
 396 #endif
 397
 398         -- The SimplifierSwitches should be delimited by "(" and ")".
 399
 400     simpl_sep (opt1:opts) simpl_sw core_td stg_td
 401       = case (_UNPK_ opt1) of
 402           "(" -> simpl_sep opts simpl_sw core_td stg_td
 403           ")" -> let
 404                     this_simpl = CoreDoSimplify (isAmongSimpl simpl_sw)
 405                  in
 406                  sep opts (this_simpl : core_td) stg_td
 407
 408 #         define SIMPL_SW(sw) simpl_sep opts (sw:simpl_sw) core_td stg_td
 409
 410           -- the non-"just match a string" options are at the end...
 411           "-fshow-simplifier-progress"      -> SIMPL_SW(ShowSimplifierProgress)
 412           "-fcode-duplication-ok"           -> SIMPL_SW(SimplOkToDupCode)
 413           "-ffloat-lets-exposing-whnf"      -> SIMPL_SW(SimplFloatLetsExposingWHNF)
 414           "-ffloat-primops-ok"              -> SIMPL_SW(SimplOkToFloatPrimOps)
 415           "-falways-float-lets-from-lets"   -> SIMPL_SW(SimplAlwaysFloatLetsFromLets)
 416           "-fdo-case-elim"                  -> SIMPL_SW(SimplDoCaseElim)
 417           "-fdo-lambda-eta-expansion"       -> SIMPL_SW(SimplDoLambdaEtaExpansion)
 418           "-fdo-foldr-build"                -> SIMPL_SW(SimplDoFoldrBuild)
 419           "-fdo-not-fold-back-append"       -> SIMPL_SW(SimplDontFoldBackAppend)
 420           "-fdo-arity-expand"               -> SIMPL_SW(SimplDoArityExpand)
 421           "-fdo-inline-foldr-build"         -> SIMPL_SW(SimplDoInlineFoldrBuild)
 422           "-freuse-con"                     -> SIMPL_SW(SimplReuseCon)
 423           "-fcase-of-case"                  -> SIMPL_SW(SimplCaseOfCase)
 424           "-fcase-merge"                    -> SIMPL_SW(SimplCaseMerge)
 425           "-flet-to-case"                   -> SIMPL_SW(SimplLetToCase)
 426           "-fpedantic-bottoms"              -> SIMPL_SW(SimplPedanticBottoms)
 427           "-fkeep-spec-pragma-ids"          -> SIMPL_SW(KeepSpecPragmaIds)
 428           "-fkeep-unused-bindings"          -> SIMPL_SW(KeepUnusedBindings)
 429           "-fmay-delete-conjurable-ids"     -> SIMPL_SW(SimplMayDeleteConjurableIds)
 430           "-fessential-unfoldings-only"     -> SIMPL_SW(EssentialUnfoldingsOnly)
 431           "-fignore-inline-pragma"          -> SIMPL_SW(IgnoreINLINEPragma)
 432           "-fno-let-from-case"              -> SIMPL_SW(SimplNoLetFromCase)
 433           "-fno-let-from-app"               -> SIMPL_SW(SimplNoLetFromApp)
 434           "-fno-let-from-strict-let"        -> SIMPL_SW(SimplNoLetFromStrictLet)
 435
 436           o | starts_with_msi  -> SIMPL_SW(MaxSimplifierIterations (read after_msi))
 437            where
 438             maybe_msi           = startsWith "-fmax-simplifier-iterations"   o
 439             starts_with_msi     = maybeToBool maybe_msi
 440             (Just after_msi)    = maybe_msi
 441
 442           _ -> -- NB: the driver is really supposed to handle bad options
 443                simpl_sep opts simpl_sw core_td stg_td
 444 \end{code}
 445
 446 %************************************************************************
 447 %*                                                                      *
 448 \subsection{Switch ordering}
 449 %*                                                                      *
 450 %************************************************************************
 451
 452 In spite of the @Produce*@ and @SccGroup@ constructors, these things
 453 behave just like enumeration types.
 454
 455 \begin{code}
 456 instance Eq SimplifierSwitch where
 457     a == b = tagOf_SimplSwitch a _EQ_ tagOf_SimplSwitch b
 458
 459 instance Ord SimplifierSwitch where
 460     a <  b  = tagOf_SimplSwitch a _LT_ tagOf_SimplSwitch b
 461     a <= b  = tagOf_SimplSwitch a _LE_ tagOf_SimplSwitch b
 462
 463 tagOf_SimplSwitch SimplOkToDupCode              =(ILIT(0) :: FAST_INT)
 464 tagOf_SimplSwitch SimplFloatLetsExposingWHNF    = ILIT(1)
 465 tagOf_SimplSwitch SimplOkToFloatPrimOps         = ILIT(2)
 466 tagOf_SimplSwitch SimplAlwaysFloatLetsFromLets  = ILIT(3)
 467 tagOf_SimplSwitch SimplDoCaseElim               = ILIT(4)
 468 tagOf_SimplSwitch SimplReuseCon                 = ILIT(5)
 469 tagOf_SimplSwitch SimplCaseOfCase               = ILIT(6)
 470 tagOf_SimplSwitch SimplLetToCase                = ILIT(7)
 471 tagOf_SimplSwitch SimplMayDeleteConjurableIds   = ILIT(9)
 472 tagOf_SimplSwitch SimplPedanticBottoms          = ILIT(10)
 473 tagOf_SimplSwitch SimplDoArityExpand            = ILIT(11)
 474 tagOf_SimplSwitch SimplDoFoldrBuild             = ILIT(12)
 475 tagOf_SimplSwitch SimplDoInlineFoldrBuild       = ILIT(14)
 476 tagOf_SimplSwitch IgnoreINLINEPragma            = ILIT(15)
 477 tagOf_SimplSwitch SimplDoLambdaEtaExpansion     = ILIT(16)
 478 tagOf_SimplSwitch EssentialUnfoldingsOnly       = ILIT(19)
 479 tagOf_SimplSwitch ShowSimplifierProgress        = ILIT(20)
 480 tagOf_SimplSwitch (MaxSimplifierIterations _)   = ILIT(21)
 481 tagOf_SimplSwitch KeepSpecPragmaIds             = ILIT(25)
 482 tagOf_SimplSwitch KeepUnusedBindings            = ILIT(26)
 483 tagOf_SimplSwitch SimplNoLetFromCase            = ILIT(27)
 484 tagOf_SimplSwitch SimplNoLetFromApp             = ILIT(28)
 485 tagOf_SimplSwitch SimplNoLetFromStrictLet       = ILIT(29)
 486 tagOf_SimplSwitch SimplDontFoldBackAppend       = ILIT(30)
 487 tagOf_SimplSwitch SimplCaseMerge                = ILIT(31)
 488 -- If you add anything here, be sure to change lAST_SIMPL_SWITCH_TAG, too!
 489
 490 tagOf_SimplSwitch _ = panic# "tagOf_SimplSwitch"
 491
 492 lAST_SIMPL_SWITCH_TAG = IBOX(tagOf_SimplSwitch SimplCaseMerge)
 493 \end{code}
 494
 495 %************************************************************************
 496 %*                                                                      *
 497 \subsection{Switch lookup}
 498 %*                                                                      *
 499 %************************************************************************
 500
 501 \begin{code}
 502 #if __GLASGOW_HASKELL__ >= 200
 503 # define ARRAY      Array
 504 # define LIFT       GHCbase.Lift
 505 # define SET_TO     =:
 506 (=:) a b = (a,b)
 507 #else
 508 # define ARRAY      _Array
 509 # define LIFT       _Lift
 510 # define SET_TO     :=
 511 #endif
 512
 513 isAmongSimpl :: [SimplifierSwitch] -> SimplifierSwitch -> SwitchResult
 514
 515 isAmongSimpl on_switches                -- Switches mentioned later occur *earlier*
 516                                         -- in the list; defaults right at the end.
 517   = let
 518         tidied_on_switches = foldl rm_dups [] on_switches
 519                 -- The fold*l* ensures that we keep the latest switches;
 520                 -- ie the ones that occur earliest in the list.
 521
 522         sw_tbl :: Array Int SwitchResult
 523
 524         sw_tbl = (array (0, lAST_SIMPL_SWITCH_TAG) -- bounds...
 525                         all_undefined)
 526                  // defined_elems
 527
 528         all_undefined = [ i SET_TO SwBool False | i <- [0 .. lAST_SIMPL_SWITCH_TAG ] ]
 529
 530         defined_elems = map mk_assoc_elem tidied_on_switches
 531     in
 532     -- (avoid some unboxing, bounds checking, and other horrible things:)
 533     case sw_tbl of { ARRAY bounds_who_needs_'em stuff ->
 534     \ switch ->
 535         case (indexArray# stuff (tagOf_SimplSwitch switch)) of
 536           LIFT v -> v
 537     }
 538   where
 539     mk_assoc_elem k@(MaxSimplifierIterations lvl)       = IBOX(tagOf_SimplSwitch k) SET_TO SwInt lvl
 540
 541     mk_assoc_elem k = IBOX(tagOf_SimplSwitch k) SET_TO SwBool   True -- I'm here, Mom!
 542
 543     -- cannot have duplicates if we are going to use the array thing
 544     rm_dups switches_so_far switch
 545       = if switch `is_elem` switches_so_far
 546         then switches_so_far
 547         else switch : switches_so_far
 548       where
 549         sw `is_elem` []     = False
 550         sw `is_elem` (s:ss) = (tagOf_SimplSwitch sw) _EQ_ (tagOf_SimplSwitch s)
 551                             || sw `is_elem` ss
 552 \end{code}
 553
 554 Default settings for simplifier switches
 555
 556 \begin{code}
 557 defaultSimplSwitches = [MaxSimplifierIterations         1
 558                        ]
 559 \end{code}
 560
 561 %************************************************************************
 562 %*                                                                      *
 563 \subsection{Misc functions for command-line options}
 564 %*                                                                      *
 565 %************************************************************************
 566
 567
 568 \begin{code}
 569 switchIsOn :: (switch -> SwitchResult) -> switch -> Bool
 570
 571 switchIsOn lookup_fn switch
 572   = case (lookup_fn switch) of
 573       SwBool False -> False
 574       _            -> True
 575
 576 stringSwitchSet :: (switch -> SwitchResult)
 577                 -> (FAST_STRING -> switch)
 578                 -> Maybe FAST_STRING
 579
 580 stringSwitchSet lookup_fn switch
 581   = case (lookup_fn (switch (panic "stringSwitchSet"))) of
 582       SwString str -> Just str
 583       _            -> Nothing
 584
 585 intSwitchSet :: (switch -> SwitchResult)
 586              -> (Int -> switch)
 587              -> Maybe Int
 588
 589 intSwitchSet lookup_fn switch
 590   = case (lookup_fn (switch (panic "intSwitchSet"))) of
 591       SwInt int -> Just int
 592       _         -> Nothing
 593 \end{code}