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_UsingGhcInternals,
  27         opt_D_dump_absC,
  28         opt_D_dump_asm,
  29         opt_D_dump_deforest,
  30         opt_D_dump_deriv,
  31         opt_D_dump_ds,
  32         opt_D_dump_flatC,
  33         opt_D_dump_occur_anal,
  34         opt_D_dump_rdr,
  35         opt_D_dump_realC,
  36         opt_D_dump_rn,
  37         opt_D_dump_simpl,
  38         opt_D_dump_spec,
  39         opt_D_dump_stg,
  40         opt_D_dump_stranal,
  41         opt_D_dump_tc,
  42         opt_D_show_passes,
  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_DoTickyProfiling,
  50         opt_EnsureSplittableC,
  51         opt_FoldrBuildOn,
  52         opt_FoldrBuildTrace,
  53         opt_ForConcurrent,
  54         opt_GlasgowExts,
  55         opt_GranMacros,
  56         opt_Haskell_1_3,
  57         opt_HiMap,
  58         opt_IgnoreIfacePragmas,
  59         opt_IgnoreStrictnessPragmas,
  60         opt_IrrefutableEverything,
  61         opt_IrrefutableTuples,
  62         opt_NoImplicitPrelude,
  63         opt_NumbersStrict,
  64         opt_OmitBlackHoling,
  65         opt_OmitDefaultInstanceMethods,
  66         opt_OmitInterfacePragmas,
  67         opt_PprStyle_All,
  68         opt_PprStyle_Debug,
  69         opt_PprStyle_User,
  70         opt_ProduceC,
  71         opt_ProduceHi,
  72         opt_ProduceS,
  73         opt_ReportWhyUnfoldingsDisallowed,
  74         opt_ReturnInRegsThreshold,
  75         opt_SccGroup,
  76         opt_SccProfilingOn,
  77         opt_ShowImportSpecs,
  78         opt_ShowPragmaNameErrs,
  79         opt_SigsRequired,
  80         opt_SpecialiseAll,
  81         opt_SpecialiseImports,
  82         opt_SpecialiseOverloaded,
  83         opt_SpecialiseTrace,
  84         opt_SpecialiseUnboxed,
  85         opt_StgDoLetNoEscapes,
  86         opt_UnfoldingCreationThreshold,
  87         opt_UnfoldingOverrideThreshold,
  88         opt_UnfoldingUseThreshold,
  89         opt_Verbose,
  90         opt_WarnNameShadowing
  91     ) where
  92
  93 IMPORT_1_3(Array(array, (//)))
  94 import PreludeGlaST     -- bad bad bad boy, Will (_Array internals)
  95 import Argv
  96
  97 CHK_Ubiq() -- debugging consistency check
  98
  99 import CgCompInfo       -- Default values for some flags
 100
 101 import Maybes           ( assocMaybe, firstJust, maybeToBool )
 102 import Util             ( startsWith, panic, panic#, assertPanic )
 103 \end{code}
 104
 105 A command-line {\em switch} is (generally) either on or off; e.g., the
 106 ``verbose'' (-v) switch is either on or off.  (The \tr{-G<group>}
 107 switch is an exception; it's set to a string, or nothing.)
 108
 109 A list of {\em ToDo}s is things to be done in a particular part of
 110 processing.  A (fictitious) example for the Core-to-Core simplifier
 111 might be: run the simplifier, then run the strictness analyser, then
 112 run the simplifier again (three ``todos'').
 113
 114 There are three ``to-do processing centers'' at the moment.  In the
 115 main loop (\tr{main/Main.lhs}), in the Core-to-Core processing loop
 116 (\tr{simplCore/SimplCore.lhs), and in the STG-to-STG processing loop
 117 (\tr{simplStg/SimplStg.lhs}).
 118
 119 %************************************************************************
 120 %*                                                                      *
 121 \subsection{Datatypes associated with command-line options}
 122 %*                                                                      *
 123 %************************************************************************
 124
 125 \begin{code}
 126 data SwitchResult
 127   = SwBool      Bool            -- on/off
 128   | SwString    FAST_STRING     -- nothing or a String
 129   | SwInt       Int             -- nothing or an Int
 130 \end{code}
 131
 132 \begin{code}
 133 data CoreToDo           -- These are diff core-to-core passes,
 134                         -- which may be invoked in any order,
 135                         -- as many times as you like.
 136
 137   = CoreDoSimplify      -- The core-to-core simplifier.
 138         (SimplifierSwitch -> SwitchResult)
 139                         -- Each run of the simplifier can take a different
 140                         -- set of simplifier-specific flags.
 141   | CoreDoCalcInlinings1
 142   | CoreDoCalcInlinings2
 143   | CoreDoFloatInwards
 144   | CoreDoFullLaziness
 145   | CoreLiberateCase
 146   | CoreDoPrintCore
 147   | CoreDoStaticArgs
 148   | CoreDoStrictness
 149   | CoreDoSpecialising
 150   | CoreDoDeforest
 151   | CoreDoFoldrBuildWorkerWrapper
 152   | CoreDoFoldrBuildWWAnal
 153 \end{code}
 154
 155 \begin{code}
 156 data StgToDo
 157   = StgDoStaticArgs
 158   | StgDoUpdateAnalysis
 159   | StgDoLambdaLift
 160   | StgDoMassageForProfiling  -- should be (next to) last
 161   -- There's also setStgVarInfo, but its absolute "lastness"
 162   -- is so critical that it is hardwired in (no flag).
 163   | D_stg_stats
 164 \end{code}
 165
 166 \begin{code}
 167 data SimplifierSwitch
 168   = SimplOkToDupCode
 169   | SimplFloatLetsExposingWHNF
 170   | SimplOkToFloatPrimOps
 171   | SimplAlwaysFloatLetsFromLets
 172   | SimplDoCaseElim
 173   | SimplReuseCon
 174   | SimplCaseOfCase
 175   | SimplLetToCase
 176   | SimplMayDeleteConjurableIds
 177   | SimplPedanticBottoms -- see Simplifier for an explanation
 178   | SimplDoArityExpand   -- expand arity of bindings
 179   | SimplDoFoldrBuild    -- This is the per-simplification flag;
 180                          -- see also FoldrBuildOn, used elsewhere
 181                          -- in the compiler.
 182   | SimplDoInlineFoldrBuild
 183                          -- inline foldr/build (*after* f/b rule is used)
 184
 185   | IgnoreINLINEPragma
 186   | SimplDoLambdaEtaExpansion
 187   | SimplDoEtaReduction
 188
 189   | EssentialUnfoldingsOnly -- never mind the thresholds, only
 190                             -- do unfoldings that *must* be done
 191                             -- (to saturate constructors and primitives)
 192
 193   | ShowSimplifierProgress  -- report counts on every interation
 194
 195   | MaxSimplifierIterations Int
 196
 197   | SimplUnfoldingUseThreshold      Int -- per-simplification variants
 198   | SimplUnfoldingConDiscount       Int
 199   | SimplUnfoldingCreationThreshold Int
 200
 201   | KeepSpecPragmaIds       -- We normally *toss* Ids we can do without
 202   | KeepUnusedBindings
 203
 204   | SimplNoLetFromCase      -- used when turning off floating entirely
 205   | SimplNoLetFromApp       -- (for experimentation only) WDP 95/10
 206   | SimplNoLetFromStrictLet
 207
 208   | SimplDontFoldBackAppend
 209                         -- we fold `foldr (:)' back into flip (++),
 210                         -- but we *don't* want to do it when compiling
 211                         -- List.hs, otherwise
 212                         -- xs ++ ys = foldr (:) ys xs
 213                         -- {- via our loopback -}
 214                         -- xs ++ ys = xs ++ ys
 215                         -- Oops!
 216                         -- So only use this flag inside List.hs
 217                         -- (Sigh, what a HACK, Andy.  WDP 96/01)
 218
 219   | SimplCaseMerge
 220 \end{code}
 221
 222 %************************************************************************
 223 %*                                                                      *
 224 \subsection{Classifying command-line options}
 225 %*                                                                      *
 226 %************************************************************************
 227
 228 \begin{code}
 229 lookUp     :: FAST_STRING -> Bool
 230 lookup_int :: String -> Maybe Int
 231 lookup_str :: String -> Maybe String
 232
 233 lookUp     sw = maybeToBool (assoc_opts sw)
 234
 235 lookup_str sw = firstJust (map (startsWith sw) unpacked_opts)
 236
 237 lookup_int sw = case (lookup_str sw) of
 238                   Nothing -> Nothing
 239                   Just xx -> Just (read xx)
 240
 241 assoc_opts    = assocMaybe [ (a, True) | a <- argv ]
 242 unpacked_opts = map _UNPK_ argv
 243 \end{code}
 244
 245 \begin{code}
 246 opt_AllDemanded                 = lookUp  SLIT("-fall-demanded")
 247 opt_AllStrict                   = lookUp  SLIT("-fall-strict")
 248 opt_AutoSccsOnAllToplevs        = lookUp  SLIT("-fauto-sccs-on-all-toplevs")
 249 opt_AutoSccsOnExportedToplevs   = lookUp  SLIT("-fauto-sccs-on-exported-toplevs")
 250 opt_AutoSccsOnIndividualCafs    = lookUp  SLIT("-fauto-sccs-on-individual-cafs")
 251 opt_D_dump_absC                 = lookUp  SLIT("-ddump-absC")
 252 opt_D_dump_asm                  = lookUp  SLIT("-ddump-asm")
 253 opt_D_dump_deforest             = lookUp  SLIT("-ddump-deforest")
 254 opt_D_dump_deriv                = lookUp  SLIT("-ddump-deriv")
 255 opt_D_dump_ds                   = lookUp  SLIT("-ddump-ds")
 256 opt_D_dump_flatC                = lookUp  SLIT("-ddump-flatC")
 257 opt_D_dump_occur_anal           = lookUp  SLIT("-ddump-occur-anal")
 258 opt_D_dump_rdr                  = lookUp  SLIT("-ddump-rdr")
 259 opt_D_dump_realC                = lookUp  SLIT("-ddump-realC")
 260 opt_D_dump_rn                   = lookUp  SLIT("-ddump-rn")
 261 opt_D_dump_simpl                = lookUp  SLIT("-ddump-simpl")
 262 opt_D_dump_spec                 = lookUp  SLIT("-ddump-spec")
 263 opt_D_dump_stg                  = lookUp  SLIT("-ddump-stg")
 264 opt_D_dump_stranal              = lookUp  SLIT("-ddump-stranal")
 265 opt_D_dump_tc                   = lookUp  SLIT("-ddump-tc")
 266 opt_D_show_passes               = lookUp  SLIT("-dshow-passes")
 267 opt_D_simplifier_stats          = lookUp  SLIT("-dsimplifier-stats")
 268 opt_D_source_stats              = lookUp  SLIT("-dsource-stats")
 269 opt_D_verbose_core2core         = lookUp  SLIT("-dverbose-simpl")
 270 opt_D_verbose_stg2stg           = lookUp  SLIT("-dverbose-stg")
 271 opt_DoCoreLinting               = lookUp  SLIT("-dcore-lint")
 272 opt_DoSemiTagging               = lookUp  SLIT("-fsemi-tagging")
 273 opt_DoTickyProfiling            = lookUp  SLIT("-fticky-ticky")
 274 opt_FoldrBuildOn                = lookUp  SLIT("-ffoldr-build-on")
 275 opt_FoldrBuildTrace             = lookUp  SLIT("-ffoldr-build-trace")
 276 opt_ForConcurrent               = lookUp  SLIT("-fconcurrent")
 277 opt_GranMacros                  = lookUp  SLIT("-fgransim")
 278 opt_GlasgowExts                 = lookUp  SLIT("-fglasgow-exts")
 279 opt_Haskell_1_3                 = lookUp  SLIT("-fhaskell-1.3")
 280 opt_IgnoreStrictnessPragmas     = lookUp  SLIT("-fignore-strictness-pragmas")
 281 opt_IrrefutableEverything       = lookUp  SLIT("-firrefutable-everything")
 282 opt_IrrefutableTuples           = lookUp  SLIT("-firrefutable-tuples")
 283 opt_WarnNameShadowing           = lookUp  SLIT("-fwarn-name-shadowing")
 284 opt_NumbersStrict               = lookUp  SLIT("-fnumbers-strict")
 285 opt_OmitBlackHoling             = lookUp  SLIT("-dno-black-holing")
 286 opt_OmitDefaultInstanceMethods  = lookUp  SLIT("-fomit-default-instance-methods")
 287 opt_OmitInterfacePragmas        = lookUp  SLIT("-fomit-interface-pragmas")
 288 opt_PprStyle_All                = lookUp  SLIT("-dppr-all")
 289 opt_PprStyle_Debug              = lookUp  SLIT("-dppr-debug")
 290 opt_PprStyle_User               = lookUp  SLIT("-dppr-user")
 291 opt_ReportWhyUnfoldingsDisallowed= lookUp SLIT("-freport-disallowed-unfoldings")
 292 opt_SccProfilingOn              = lookUp  SLIT("-fscc-profiling")
 293 opt_ShowImportSpecs             = lookUp  SLIT("-fshow-import-specs")
 294 opt_ShowPragmaNameErrs          = lookUp  SLIT("-fshow-pragma-name-errs")
 295 opt_SigsRequired                = lookUp  SLIT("-fsignatures-required")
 296 opt_SpecialiseAll               = lookUp  SLIT("-fspecialise-all")
 297 opt_SpecialiseImports           = lookUp  SLIT("-fspecialise-imports")
 298 opt_SpecialiseOverloaded        = lookUp  SLIT("-fspecialise-overloaded")
 299 opt_SpecialiseTrace             = lookUp  SLIT("-ftrace-specialisation")
 300 opt_SpecialiseUnboxed           = lookUp  SLIT("-fspecialise-unboxed")
 301 opt_StgDoLetNoEscapes           = lookUp  SLIT("-flet-no-escape")
 302 opt_Verbose                     = lookUp  SLIT("-v")
 303 opt_UsingGhcInternals           = lookUp  SLIT("-fusing-ghc-internals")
 304 opt_CompilingGhcInternals       = maybeToBool maybe_CompilingGhcInternals
 305 maybe_CompilingGhcInternals     = lookup_str "-fcompiling-ghc-internals="
 306 opt_SccGroup                    = lookup_str "-G="
 307 opt_ProduceC                    = lookup_str "-C="
 308 opt_ProduceS                    = lookup_str "-S="
 309 opt_ProduceHi                   = lookup_str "-hifile=" -- the one to produce this time
 310 opt_HiMap                       = lookup_str "-himap="  -- file saying where to look for .hi files
 311 opt_EnsureSplittableC           = lookup_str "-fglobalise-toplev-names="
 312 opt_UnfoldingUseThreshold       = lookup_int "-funfolding-use-threshold"
 313 opt_UnfoldingCreationThreshold  = lookup_int "-funfolding-creation-threshold"
 314 opt_UnfoldingOverrideThreshold  = lookup_int "-funfolding-override-threshold"
 315 opt_ReturnInRegsThreshold       = lookup_int "-freturn-in-regs-threshold"
 316
 317 opt_NoImplicitPrelude           = lookUp  SLIT("-fno-implicit-prelude")
 318 opt_IgnoreIfacePragmas          = lookUp  SLIT("-fignore-interface-pragmas")
 319 \end{code}
 320
 321 \begin{code}
 322 classifyOpts :: ([CoreToDo],    -- Core-to-Core processing spec
 323                  [StgToDo])     -- STG-to-STG   processing spec
 324
 325 classifyOpts = sep argv [] [] -- accumulators...
 326   where
 327     sep :: [FAST_STRING]                         -- cmd-line opts (input)
 328         -> [CoreToDo] -> [StgToDo]       -- to_do accumulators
 329         -> ([CoreToDo], [StgToDo])       -- result
 330
 331     sep [] core_td stg_td -- all done!
 332       = (reverse core_td, reverse stg_td)
 333
 334 #       define CORE_TD(to_do) sep opts (to_do:core_td) stg_td
 335 #       define STG_TD(to_do)  sep opts core_td (to_do:stg_td)
 336 #       define IGNORE_ARG()   sep opts core_td stg_td
 337
 338     sep (opt1:opts) core_td stg_td
 339       =
 340         case (_UNPK_ opt1) of -- the non-"just match a string" options are at the end...
 341
 342           ',' : _       -> IGNORE_ARG() -- it is for the parser
 343
 344           "-fsimplify"  -> -- gather up SimplifierSwitches specially...
 345                            simpl_sep opts defaultSimplSwitches core_td stg_td
 346
 347           "-fcalc-inlinings1"-> CORE_TD(CoreDoCalcInlinings1)
 348           "-fcalc-inlinings2"-> CORE_TD(CoreDoCalcInlinings2)
 349           "-ffloat-inwards"  -> CORE_TD(CoreDoFloatInwards)
 350           "-ffull-laziness"  -> CORE_TD(CoreDoFullLaziness)
 351           "-fliberate-case"  -> CORE_TD(CoreLiberateCase)
 352           "-fprint-core"     -> CORE_TD(CoreDoPrintCore)
 353           "-fstatic-args"    -> CORE_TD(CoreDoStaticArgs)
 354           "-fstrictness"     -> CORE_TD(CoreDoStrictness)
 355           "-fspecialise"     -> CORE_TD(CoreDoSpecialising)
 356           "-fdeforest"       -> CORE_TD(CoreDoDeforest)
 357           "-ffoldr-build-worker-wrapper"  -> CORE_TD(CoreDoFoldrBuildWorkerWrapper)
 358           "-ffoldr-build-ww-anal"  -> CORE_TD(CoreDoFoldrBuildWWAnal)
 359
 360           "-fstg-static-args" -> STG_TD(StgDoStaticArgs)
 361           "-fupdate-analysis" -> STG_TD(StgDoUpdateAnalysis)
 362           "-dstg-stats"       -> STG_TD(D_stg_stats)
 363           "-flambda-lift"     -> STG_TD(StgDoLambdaLift)
 364           "-fmassage-stg-for-profiling" -> STG_TD(StgDoMassageForProfiling)
 365
 366           _ -> -- NB: the driver is really supposed to handle bad options
 367                IGNORE_ARG()
 368
 369     ----------------
 370
 371     simpl_sep :: [FAST_STRING]      -- cmd-line opts (input)
 372         -> [SimplifierSwitch]       -- simplifier-switch accumulator
 373         -> [CoreToDo] -> [StgToDo]  -- to_do accumulators
 374         -> ([CoreToDo], [StgToDo])  -- result
 375
 376         -- "simpl_sep" tailcalls "sep" once it's seen one set
 377         -- of SimplifierSwitches for a CoreDoSimplify.
 378
 379 #ifdef DEBUG
 380     simpl_sep input@[] simpl_sw core_td stg_td
 381       = panic "simpl_sep []"
 382 #endif
 383
 384         -- The SimplifierSwitches should be delimited by "(" and ")".
 385
 386     simpl_sep (opt1:opts) simpl_sw core_td stg_td
 387       = case (_UNPK_ opt1) of
 388           "(" -> simpl_sep opts simpl_sw core_td stg_td
 389           ")" -> let
 390                     this_simpl = CoreDoSimplify (isAmongSimpl simpl_sw)
 391                  in
 392                  sep opts (this_simpl : core_td) stg_td
 393
 394 #         define SIMPL_SW(sw) simpl_sep opts (sw:simpl_sw) core_td stg_td
 395
 396           -- the non-"just match a string" options are at the end...
 397           "-fshow-simplifier-progress"      -> SIMPL_SW(ShowSimplifierProgress)
 398           "-fcode-duplication-ok"           -> SIMPL_SW(SimplOkToDupCode)
 399           "-ffloat-lets-exposing-whnf"      -> SIMPL_SW(SimplFloatLetsExposingWHNF)
 400           "-ffloat-primops-ok"              -> SIMPL_SW(SimplOkToFloatPrimOps)
 401           "-falways-float-lets-from-lets"   -> SIMPL_SW(SimplAlwaysFloatLetsFromLets)
 402           "-fdo-case-elim"                  -> SIMPL_SW(SimplDoCaseElim)
 403           "-fdo-eta-reduction"              -> SIMPL_SW(SimplDoEtaReduction)
 404           "-fdo-lambda-eta-expansion"       -> SIMPL_SW(SimplDoLambdaEtaExpansion)
 405           "-fdo-foldr-build"                -> SIMPL_SW(SimplDoFoldrBuild)
 406           "-fdo-not-fold-back-append"       -> SIMPL_SW(SimplDontFoldBackAppend)
 407           "-fdo-arity-expand"               -> SIMPL_SW(SimplDoArityExpand)
 408           "-fdo-inline-foldr-build"         -> SIMPL_SW(SimplDoInlineFoldrBuild)
 409           "-freuse-con"                     -> SIMPL_SW(SimplReuseCon)
 410           "-fcase-of-case"                  -> SIMPL_SW(SimplCaseOfCase)
 411           "-fcase-merge"                    -> SIMPL_SW(SimplCaseMerge)
 412           "-flet-to-case"                   -> SIMPL_SW(SimplLetToCase)
 413           "-fpedantic-bottoms"              -> SIMPL_SW(SimplPedanticBottoms)
 414           "-fkeep-spec-pragma-ids"          -> SIMPL_SW(KeepSpecPragmaIds)
 415           "-fkeep-unused-bindings"          -> SIMPL_SW(KeepUnusedBindings)
 416           "-fmay-delete-conjurable-ids"     -> SIMPL_SW(SimplMayDeleteConjurableIds)
 417           "-fessential-unfoldings-only"     -> SIMPL_SW(EssentialUnfoldingsOnly)
 418           "-fignore-inline-pragma"          -> SIMPL_SW(IgnoreINLINEPragma)
 419           "-fno-let-from-case"              -> SIMPL_SW(SimplNoLetFromCase)
 420           "-fno-let-from-app"               -> SIMPL_SW(SimplNoLetFromApp)
 421           "-fno-let-from-strict-let"        -> SIMPL_SW(SimplNoLetFromStrictLet)
 422
 423           o | starts_with_msi  -> SIMPL_SW(MaxSimplifierIterations (read after_msi))
 424             | starts_with_suut -> SIMPL_SW(SimplUnfoldingUseThreshold (read after_suut))
 425             | starts_with_suct -> SIMPL_SW(SimplUnfoldingCreationThreshold (read after_suct))
 426             | starts_with_sucd -> SIMPL_SW(SimplUnfoldingConDiscount (read after_sucd))
 427            where
 428             maybe_suut          = startsWith "-fsimpl-uf-use-threshold"      o
 429             maybe_suct          = startsWith "-fsimpl-uf-creation-threshold" o
 430             maybe_sucd          = startsWith "-fsimpl-uf-con-discount" o
 431             maybe_msi           = startsWith "-fmax-simplifier-iterations"   o
 432             starts_with_suut    = maybeToBool maybe_suut
 433             starts_with_suct    = maybeToBool maybe_suct
 434             starts_with_sucd    = maybeToBool maybe_sucd
 435             starts_with_msi     = maybeToBool maybe_msi
 436             (Just after_suut)   = maybe_suut
 437             (Just after_suct)   = maybe_suct
 438             (Just after_sucd)   = maybe_sucd
 439             (Just after_msi)    = maybe_msi
 440
 441           _ -> -- NB: the driver is really supposed to handle bad options
 442                simpl_sep opts simpl_sw core_td stg_td
 443 \end{code}
 444
 445 %************************************************************************
 446 %*                                                                      *
 447 \subsection{Switch ordering}
 448 %*                                                                      *
 449 %************************************************************************
 450
 451 In spite of the @Produce*@ and @SccGroup@ constructors, these things
 452 behave just like enumeration types.
 453
 454 \begin{code}
 455 instance Eq SimplifierSwitch where
 456     a == b = tagOf_SimplSwitch a _EQ_ tagOf_SimplSwitch b
 457
 458 instance Ord SimplifierSwitch where
 459     a <  b  = tagOf_SimplSwitch a _LT_ tagOf_SimplSwitch b
 460     a <= b  = tagOf_SimplSwitch a _LE_ tagOf_SimplSwitch b
 461
 462 tagOf_SimplSwitch SimplOkToDupCode              =(ILIT(0) :: FAST_INT)
 463 tagOf_SimplSwitch SimplFloatLetsExposingWHNF    = ILIT(1)
 464 tagOf_SimplSwitch SimplOkToFloatPrimOps         = ILIT(2)
 465 tagOf_SimplSwitch SimplAlwaysFloatLetsFromLets  = ILIT(3)
 466 tagOf_SimplSwitch SimplDoCaseElim               = ILIT(4)
 467 tagOf_SimplSwitch SimplReuseCon                 = ILIT(5)
 468 tagOf_SimplSwitch SimplCaseOfCase               = ILIT(6)
 469 tagOf_SimplSwitch SimplLetToCase                = ILIT(7)
 470 tagOf_SimplSwitch SimplMayDeleteConjurableIds   = ILIT(9)
 471 tagOf_SimplSwitch SimplPedanticBottoms          = ILIT(10)
 472 tagOf_SimplSwitch SimplDoArityExpand            = ILIT(11)
 473 tagOf_SimplSwitch SimplDoFoldrBuild             = ILIT(12)
 474 tagOf_SimplSwitch SimplDoInlineFoldrBuild       = ILIT(14)
 475 tagOf_SimplSwitch IgnoreINLINEPragma            = ILIT(15)
 476 tagOf_SimplSwitch SimplDoLambdaEtaExpansion     = ILIT(16)
 477 tagOf_SimplSwitch SimplDoEtaReduction           = ILIT(18)
 478 tagOf_SimplSwitch EssentialUnfoldingsOnly       = ILIT(19)
 479 tagOf_SimplSwitch ShowSimplifierProgress        = ILIT(20)
 480 tagOf_SimplSwitch (MaxSimplifierIterations _)   = ILIT(21)
 481 tagOf_SimplSwitch (SimplUnfoldingUseThreshold _)      = ILIT(22)
 482 tagOf_SimplSwitch (SimplUnfoldingConDiscount _)       = ILIT(23)
 483 tagOf_SimplSwitch (SimplUnfoldingCreationThreshold _) = ILIT(24)
 484 tagOf_SimplSwitch KeepSpecPragmaIds             = ILIT(25)
 485 tagOf_SimplSwitch KeepUnusedBindings            = ILIT(26)
 486 tagOf_SimplSwitch SimplNoLetFromCase            = ILIT(27)
 487 tagOf_SimplSwitch SimplNoLetFromApp             = ILIT(28)
 488 tagOf_SimplSwitch SimplNoLetFromStrictLet       = ILIT(29)
 489 tagOf_SimplSwitch SimplDontFoldBackAppend       = ILIT(30)
 490 tagOf_SimplSwitch SimplCaseMerge                = ILIT(31)
 491 -- If you add anything here, be sure to change lAST_SIMPL_SWITCH_TAG, too!
 492
 493 tagOf_SimplSwitch _ = panic# "tagOf_SimplSwitch"
 494
 495 lAST_SIMPL_SWITCH_TAG = IBOX(tagOf_SimplSwitch SimplCaseMerge)
 496 \end{code}
 497
 498 %************************************************************************
 499 %*                                                                      *
 500 \subsection{Switch lookup}
 501 %*                                                                      *
 502 %************************************************************************
 503
 504 \begin{code}
 505 #if __GLASGOW_HASKELL__ >= 200
 506 # define ARRAY      Array
 507 # define LIFT       GHCbase.Lift
 508 # define SET_TO     =:
 509 (=:) a b = (a,b)
 510 #else
 511 # define ARRAY      _Array
 512 # define LIFT       _Lift
 513 # define SET_TO     :=
 514 #endif
 515
 516 isAmongSimpl :: [SimplifierSwitch] -> SimplifierSwitch -> SwitchResult
 517
 518 isAmongSimpl on_switches                -- Switches mentioned later occur *earlier*
 519                                         -- in the list; defaults right at the end.
 520   = let
 521         tidied_on_switches = foldl rm_dups [] on_switches
 522                 -- The fold*l* ensures that we keep the latest switches;
 523                 -- ie the ones that occur earliest in the list.
 524
 525         sw_tbl :: Array Int SwitchResult
 526
 527         sw_tbl = (array (0, lAST_SIMPL_SWITCH_TAG) -- bounds...
 528                         all_undefined)
 529                  // defined_elems
 530
 531         all_undefined = [ i SET_TO SwBool False | i <- [0 .. lAST_SIMPL_SWITCH_TAG ] ]
 532
 533         defined_elems = map mk_assoc_elem tidied_on_switches
 534     in
 535     -- (avoid some unboxing, bounds checking, and other horrible things:)
 536     case sw_tbl of { ARRAY bounds_who_needs_'em stuff ->
 537     \ switch ->
 538         case (indexArray# stuff (tagOf_SimplSwitch switch)) of
 539           LIFT v -> v
 540     }
 541   where
 542     mk_assoc_elem k@(MaxSimplifierIterations lvl)       = IBOX(tagOf_SimplSwitch k) SET_TO SwInt lvl
 543     mk_assoc_elem k@(SimplUnfoldingUseThreshold      i) = IBOX(tagOf_SimplSwitch k) SET_TO SwInt i
 544     mk_assoc_elem k@(SimplUnfoldingConDiscount       i) = IBOX(tagOf_SimplSwitch k) SET_TO SwInt i
 545     mk_assoc_elem k@(SimplUnfoldingCreationThreshold i) = IBOX(tagOf_SimplSwitch k) SET_TO SwInt i
 546
 547     mk_assoc_elem k = IBOX(tagOf_SimplSwitch k) SET_TO SwBool   True -- I'm here, Mom!
 548
 549     -- cannot have duplicates if we are going to use the array thing
 550     rm_dups switches_so_far switch
 551       = if switch `is_elem` switches_so_far
 552         then switches_so_far
 553         else switch : switches_so_far
 554       where
 555         sw `is_elem` []     = False
 556         sw `is_elem` (s:ss) = (tagOf_SimplSwitch sw) _EQ_ (tagOf_SimplSwitch s)
 557                             || sw `is_elem` ss
 558 \end{code}
 559
 560 Default settings for simplifier switches
 561
 562 \begin{code}
 563 defaultSimplSwitches = [SimplUnfoldingCreationThreshold uNFOLDING_CREATION_THRESHOLD,
 564                         SimplUnfoldingUseThreshold      uNFOLDING_USE_THRESHOLD,
 565                         SimplUnfoldingConDiscount       uNFOLDING_CON_DISCOUNT_WEIGHT,
 566                         MaxSimplifierIterations         1
 567                        ]
 568 \end{code}
 569
 570 %************************************************************************
 571 %*                                                                      *
 572 \subsection{Misc functions for command-line options}
 573 %*                                                                      *
 574 %************************************************************************
 575
 576
 577 \begin{code}
 578 switchIsOn :: (switch -> SwitchResult) -> switch -> Bool
 579
 580 switchIsOn lookup_fn switch
 581   = case (lookup_fn switch) of
 582       SwBool False -> False
 583       _            -> True
 584
 585 stringSwitchSet :: (switch -> SwitchResult)
 586                 -> (FAST_STRING -> switch)
 587                 -> Maybe FAST_STRING
 588
 589 stringSwitchSet lookup_fn switch
 590   = case (lookup_fn (switch (panic "stringSwitchSet"))) of
 591       SwString str -> Just str
 592       _            -> Nothing
 593
 594 intSwitchSet :: (switch -> SwitchResult)
 595              -> (Int -> switch)
 596              -> Maybe Int
 597
 598 intSwitchSet lookup_fn switch
 599   = case (lookup_fn (switch (panic "intSwitchSet"))) of
 600       SwInt int -> Just int
 601       _         -> Nothing
 602 \end{code}