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_deriv,
  29         opt_D_dump_ds,
  30         opt_D_dump_flatC,
  31         opt_D_dump_occur_anal,
  32         opt_D_dump_rdr,
  33         opt_D_dump_realC,
  34         opt_D_dump_rn,
  35         opt_D_dump_simpl,
  36         opt_D_dump_simpl_iterations,
  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_DoStgLinting,
  49         opt_DoSemiTagging,
  50         opt_DoEtaReduction,
  51         opt_DoTickyProfiling,
  52         opt_EnsureSplittableC,
  53         opt_FoldrBuildOn,
  54         opt_FoldrBuildTrace,
  55         opt_ForConcurrent,
  56         opt_GlasgowExts,
  57         opt_GranMacros,
  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,              -- ToDo: rm
  72         opt_PprUserLength,
  73         opt_ProduceC,
  74         opt_ProduceHi,
  75         opt_ProduceS,
  76         opt_ReportWhyUnfoldingsDisallowed,
  77         opt_ReturnInRegsThreshold,
  78         opt_SccGroup,
  79         opt_SccProfilingOn,
  80         opt_ShowImportSpecs,
  81         opt_ShowPragmaNameErrs,
  82         opt_SigsRequired,
  83         opt_SourceUnchanged,
  84         opt_SpecialiseAll,
  85         opt_SpecialiseImports,
  86         opt_SpecialiseOverloaded,
  87         opt_SpecialiseTrace,
  88         opt_SpecialiseUnboxed,
  89         opt_StgDoLetNoEscapes,
  90
  91         opt_InterfaceUnfoldThreshold,
  92         opt_UnfoldingCreationThreshold,
  93         opt_UnfoldingConDiscount,
  94         opt_UnfoldingUseThreshold,
  95
  96         opt_Verbose,
  97         opt_WarnNameShadowing,
  98         opt_WarnUnusedNames,
  99         opt_WarnIncompletePatterns, opt_WarnOverlappedPatterns,
 100         opt_WarnMissingMethods,
 101         opt_PruneTyDecls, opt_PruneInstDecls,
 102         opt_D_show_unused_imports,
 103         opt_D_show_rn_stats,
 104
 105         all_toplev_ids_visible
 106     ) where
 107
 108 IMPORT_1_3(Array(array, (//)))
 109 #if defined(__GLASGOW_HASKELL__) && __GLASGOW_HASKELL__ <= 201
 110 import PreludeGlaST     -- bad bad bad boy, Will (_Array internals)
 111 #else
 112 import GlaExts
 113 import ArrBase
 114 -- 2.04 and later exports Lift from GlaExts
 115 #if __GLASGOW_HASKELL__ < 204
 116 import PrelBase (Lift(..))
 117 #endif
 118 #endif
 119
 120 CHK_Ubiq() -- debugging consistency check
 121
 122 import Argv
 123 import Constants        -- Default values for some flags
 124 import Maybes           ( assocMaybe, firstJust, maybeToBool )
 125 import Util             ( startsWith, panic, panic#, assertPanic )
 126 \end{code}
 127
 128 A command-line {\em switch} is (generally) either on or off; e.g., the
 129 ``verbose'' (-v) switch is either on or off.  (The \tr{-G<group>}
 130 switch is an exception; it's set to a string, or nothing.)
 131
 132 A list of {\em ToDo}s is things to be done in a particular part of
 133 processing.  A (fictitious) example for the Core-to-Core simplifier
 134 might be: run the simplifier, then run the strictness analyser, then
 135 run the simplifier again (three ``todos'').
 136
 137 There are three ``to-do processing centers'' at the moment.  In the
 138 main loop (\tr{main/Main.lhs}), in the Core-to-Core processing loop
 139 (\tr{simplCore/SimplCore.lhs), and in the STG-to-STG processing loop
 140 (\tr{simplStg/SimplStg.lhs}).
 141
 142 %************************************************************************
 143 %*                                                                      *
 144 \subsection{Datatypes associated with command-line options}
 145 %*                                                                      *
 146 %************************************************************************
 147
 148 \begin{code}
 149 data SwitchResult
 150   = SwBool      Bool            -- on/off
 151   | SwString    FAST_STRING     -- nothing or a String
 152   | SwInt       Int             -- nothing or an Int
 153 \end{code}
 154
 155 \begin{code}
 156 data CoreToDo           -- These are diff core-to-core passes,
 157                         -- which may be invoked in any order,
 158                         -- as many times as you like.
 159
 160   = CoreDoSimplify      -- The core-to-core simplifier.
 161         (SimplifierSwitch -> SwitchResult)
 162                         -- Each run of the simplifier can take a different
 163                         -- set of simplifier-specific flags.
 164   | CoreDoCalcInlinings1
 165   | CoreDoCalcInlinings2
 166   | CoreDoFloatInwards
 167   | CoreDoFullLaziness
 168   | CoreLiberateCase
 169   | CoreDoPrintCore
 170   | CoreDoStaticArgs
 171   | CoreDoStrictness
 172   | CoreDoSpecialising
 173   | CoreDoFoldrBuildWorkerWrapper
 174   | CoreDoFoldrBuildWWAnal
 175 \end{code}
 176
 177 \begin{code}
 178 data StgToDo
 179   = StgDoStaticArgs
 180   | StgDoUpdateAnalysis
 181   | StgDoLambdaLift
 182   | StgDoMassageForProfiling  -- should be (next to) last
 183   -- There's also setStgVarInfo, but its absolute "lastness"
 184   -- is so critical that it is hardwired in (no flag).
 185   | D_stg_stats
 186 \end{code}
 187
 188 \begin{code}
 189 data SimplifierSwitch
 190   = SimplOkToDupCode
 191   | SimplFloatLetsExposingWHNF
 192   | SimplOkToFloatPrimOps
 193   | SimplAlwaysFloatLetsFromLets
 194   | SimplDoCaseElim
 195   | SimplReuseCon
 196   | SimplCaseOfCase
 197   | SimplLetToCase
 198   | SimplMayDeleteConjurableIds
 199   | SimplPedanticBottoms -- see Simplifier for an explanation
 200   | SimplDoArityExpand   -- expand arity of bindings
 201   | SimplDoFoldrBuild    -- This is the per-simplification flag;
 202                          -- see also FoldrBuildOn, used elsewhere
 203                          -- in the compiler.
 204   | SimplDoInlineFoldrBuild
 205                          -- inline foldr/build (*after* f/b rule is used)
 206
 207   | IgnoreINLINEPragma
 208   | SimplDoLambdaEtaExpansion
 209
 210   | EssentialUnfoldingsOnly -- never mind the thresholds, only
 211                             -- do unfoldings that *must* be done
 212                             -- (to saturate constructors and primitives)
 213
 214   | ShowSimplifierProgress  -- report counts on every interation
 215
 216   | MaxSimplifierIterations Int
 217
 218   | KeepSpecPragmaIds       -- We normally *toss* Ids we can do without
 219   | KeepUnusedBindings
 220
 221   | SimplNoLetFromCase      -- used when turning off floating entirely
 222   | SimplNoLetFromApp       -- (for experimentation only) WDP 95/10
 223   | SimplNoLetFromStrictLet
 224
 225   | SimplDontFoldBackAppend
 226                         -- we fold `foldr (:)' back into flip (++),
 227                         -- but we *don't* want to do it when compiling
 228                         -- List.hs, otherwise
 229                         -- xs ++ ys = foldr (:) ys xs
 230                         -- {- via our loopback -}
 231                         -- xs ++ ys = xs ++ ys
 232                         -- Oops!
 233                         -- So only use this flag inside List.hs
 234                         -- (Sigh, what a HACK, Andy.  WDP 96/01)
 235
 236   | SimplCaseMerge
 237   | SimplCaseScrutinee  -- This flag tells that the expression being simplified is
 238                         -- the scrutinee of a case expression, so we should
 239                         -- apply the scrutinee discount when considering inlinings.
 240                         -- See SimplVar.lhs
 241 \end{code}
 242
 243 %************************************************************************
 244 %*                                                                      *
 245 \subsection{Classifying command-line options}
 246 %*                                                                      *
 247 %************************************************************************
 248
 249 \begin{code}
 250 lookUp         :: FAST_STRING -> Bool
 251 lookup_int     :: String -> Maybe Int
 252 lookup_def_int :: String -> Int -> Int
 253 lookup_str     :: String -> Maybe String
 254
 255 lookUp     sw = maybeToBool (assoc_opts sw)
 256
 257 lookup_str sw = firstJust (map (startsWith sw) unpacked_opts)
 258
 259 lookup_int sw = case (lookup_str sw) of
 260                   Nothing -> Nothing
 261                   Just xx -> Just (read xx)
 262
 263 lookup_def_int 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_AllDemanded                 = lookUp  SLIT("-fall-demanded")
 273 opt_AllStrict                   = lookUp  SLIT("-fall-strict")
 274 opt_AutoSccsOnAllToplevs        = lookUp  SLIT("-fauto-sccs-on-all-toplevs")
 275 opt_AutoSccsOnExportedToplevs   = lookUp  SLIT("-fauto-sccs-on-exported-toplevs")
 276 opt_AutoSccsOnIndividualCafs    = lookUp  SLIT("-fauto-sccs-on-individual-cafs")
 277 opt_CompilingGhcInternals       = maybeToBool maybe_CompilingGhcInternals
 278 maybe_CompilingGhcInternals     = lookup_str "-fcompiling-ghc-internals="
 279 opt_D_dump_absC                 = lookUp  SLIT("-ddump-absC")
 280 opt_D_dump_asm                  = lookUp  SLIT("-ddump-asm")
 281 opt_D_dump_deriv                = lookUp  SLIT("-ddump-deriv")
 282 opt_D_dump_ds                   = lookUp  SLIT("-ddump-ds")
 283 opt_D_dump_flatC                = lookUp  SLIT("-ddump-flatC")
 284 opt_D_dump_occur_anal           = lookUp  SLIT("-ddump-occur-anal")
 285 opt_D_dump_rdr                  = lookUp  SLIT("-ddump-rdr")
 286 opt_D_dump_realC                = lookUp  SLIT("-ddump-realC")
 287 opt_D_dump_rn                   = lookUp  SLIT("-ddump-rn")
 288 opt_D_dump_simpl                = lookUp  SLIT("-ddump-simpl")
 289 opt_D_dump_simpl_iterations     = lookUp  SLIT("-ddump-simpl-iterations")
 290 opt_D_dump_spec                 = lookUp  SLIT("-ddump-spec")
 291 opt_D_dump_stg                  = lookUp  SLIT("-ddump-stg")
 292 opt_D_dump_stranal              = lookUp  SLIT("-ddump-stranal")
 293 opt_D_dump_tc                   = lookUp  SLIT("-ddump-tc")
 294 opt_D_show_passes               = lookUp  SLIT("-dshow-passes")
 295 opt_D_show_rn_trace             = lookUp  SLIT("-dshow-rn-trace")
 296 opt_D_simplifier_stats          = lookUp  SLIT("-dsimplifier-stats")
 297 opt_D_source_stats              = lookUp  SLIT("-dsource-stats")
 298 opt_D_verbose_core2core         = lookUp  SLIT("-dverbose-simpl")
 299 opt_D_verbose_stg2stg           = lookUp  SLIT("-dverbose-stg")
 300 opt_DoCoreLinting               = lookUp  SLIT("-dcore-lint")
 301 opt_DoStgLinting                = lookUp  SLIT("-dstg-lint")
 302 opt_DoSemiTagging               = lookUp  SLIT("-fsemi-tagging")
 303 opt_DoTickyProfiling            = lookUp  SLIT("-fticky-ticky")
 304 opt_DoEtaReduction              = lookUp  SLIT("-fdo-eta-reduction")
 305 opt_EnsureSplittableC           = lookUp  SLIT("-fglobalise-toplev-names")
 306 opt_FoldrBuildOn                = lookUp  SLIT("-ffoldr-build-on")
 307 opt_FoldrBuildTrace             = lookUp  SLIT("-ffoldr-build-trace")
 308 opt_ForConcurrent               = lookUp  SLIT("-fconcurrent")
 309 opt_GranMacros                  = lookUp  SLIT("-fgransim")
 310 opt_GlasgowExts                 = lookUp  SLIT("-fglasgow-exts")
 311 --UNUSED:opt_Haskell_1_3        = lookUp  SLIT("-fhaskell-1.3")
 312 opt_HiMap                       = lookup_str "-himap="  -- file saying where to look for .hi files
 313 opt_IgnoreIfacePragmas          = lookUp  SLIT("-fignore-interface-pragmas")
 314 opt_IgnoreStrictnessPragmas     = lookUp  SLIT("-fignore-strictness-pragmas")
 315 opt_IrrefutableEverything       = lookUp  SLIT("-firrefutable-everything")
 316 opt_IrrefutableTuples           = lookUp  SLIT("-firrefutable-tuples")
 317 opt_NoImplicitPrelude           = lookUp  SLIT("-fno-implicit-prelude")
 318 opt_NumbersStrict               = lookUp  SLIT("-fnumbers-strict")
 319 opt_OmitBlackHoling             = lookUp  SLIT("-dno-black-holing")
 320 opt_OmitDefaultInstanceMethods  = lookUp  SLIT("-fomit-default-instance-methods")
 321 opt_OmitInterfacePragmas        = lookUp  SLIT("-fomit-interface-pragmas")
 322 opt_PprStyle_All                = lookUp  SLIT("-dppr-all")
 323 opt_PprStyle_Debug              = lookUp  SLIT("-dppr-debug")
 324 opt_PprStyle_User               = lookUp  SLIT("-dppr-user")
 325 opt_PprUserLength               = lookup_def_int "-dppr-user-length" 5 --ToDo: give this a name
 326 opt_ProduceC                    = lookup_str "-C="
 327 opt_ProduceS                    = lookup_str "-S="
 328 opt_ProduceHi                   = lookup_str "-hifile=" -- the one to produce this time
 329 opt_ReportWhyUnfoldingsDisallowed= lookUp SLIT("-freport-disallowed-unfoldings")
 330 opt_SccProfilingOn              = lookUp  SLIT("-fscc-profiling")
 331 opt_ShowImportSpecs             = lookUp  SLIT("-fshow-import-specs")
 332 opt_ShowPragmaNameErrs          = lookUp  SLIT("-fshow-pragma-name-errs")
 333 opt_SigsRequired                = lookUp  SLIT("-fsignatures-required")
 334 opt_SourceUnchanged             = lookUp  SLIT("-fsource-unchanged")
 335 opt_SpecialiseAll               = lookUp  SLIT("-fspecialise-all")
 336 opt_SpecialiseImports           = lookUp  SLIT("-fspecialise-imports")
 337 opt_SpecialiseOverloaded        = lookUp  SLIT("-fspecialise-overloaded")
 338 opt_SpecialiseTrace             = lookUp  SLIT("-ftrace-specialisation")
 339 opt_SpecialiseUnboxed           = lookUp  SLIT("-fspecialise-unboxed")
 340 opt_StgDoLetNoEscapes           = lookUp  SLIT("-flet-no-escape")
 341 opt_ReturnInRegsThreshold       = lookup_int "-freturn-in-regs-threshold"
 342 opt_SccGroup                    = lookup_str "-G="
 343 opt_Verbose                     = lookUp  SLIT("-v")
 344
 345 opt_InterfaceUnfoldThreshold    = lookup_def_int "-funfolding-interface-threshold" iNTERFACE_UNFOLD_THRESHOLD
 346 opt_UnfoldingCreationThreshold  = lookup_def_int "-funfolding-creation-threshold"  uNFOLDING_CREATION_THRESHOLD
 347 opt_UnfoldingUseThreshold       = lookup_def_int "-funfolding-use-threshold"       uNFOLDING_USE_THRESHOLD
 348 opt_UnfoldingConDiscount        = lookup_def_int "-funfolding-con-discount"        uNFOLDING_CON_DISCOUNT_WEIGHT
 349
 350 opt_LiberateCaseThreshold       = lookup_def_int "-fliberate-case-threshold"       lIBERATE_CASE_THRESHOLD
 351 opt_WarnNameShadowing           = lookUp  SLIT("-fwarn-name-shadowing")
 352 opt_WarnIncompletePatterns      = lookUp  SLIT("-fwarn-incomplete-patterns")
 353 opt_WarnOverlappedPatterns      = lookUp  SLIT("-fwarn-overlapped-patterns")
 354 opt_WarnUnusedNames             = lookUp  SLIT("-fwarn-unused-names")
 355 opt_WarnMissingMethods          = lookUp  SLIT("-fwarn-missing-methods")
 356 opt_PruneTyDecls                = not (lookUp SLIT("-fno-prune-tydecls"))
 357 opt_PruneInstDecls              = not (lookUp SLIT("-fno-prune-instdecls"))
 358 opt_D_show_unused_imports       = lookUp SLIT("-dshow-unused-imports")
 359 opt_D_show_rn_stats             = lookUp SLIT("-dshow-rn-stats")
 360
 361 -- opt_UnfoldingOverrideThreshold       = lookup_int "-funfolding-override-threshold"
 362 \end{code}
 363
 364
 365 \begin{code}
 366 all_toplev_ids_visible :: Bool
 367 all_toplev_ids_visible =
 368   not opt_OmitInterfacePragmas ||  -- Pragmas can make them visible
 369   opt_EnsureSplittableC        ||  -- Splitting requires visiblilty
 370   opt_AutoSccsOnAllToplevs         -- ditto for profiling
 371                                    -- (ToDo: fix up the auto-annotation
 372                                    -- pass in the desugarer to avoid having
 373                                    -- to do this)
 374
 375 \end{code}
 376
 377
 378
 379 \begin{code}
 380 classifyOpts :: ([CoreToDo],    -- Core-to-Core processing spec
 381                  [StgToDo])     -- STG-to-STG   processing spec
 382
 383 classifyOpts = sep argv [] [] -- accumulators...
 384   where
 385     sep :: [FAST_STRING]                         -- cmd-line opts (input)
 386         -> [CoreToDo] -> [StgToDo]       -- to_do accumulators
 387         -> ([CoreToDo], [StgToDo])       -- result
 388
 389     sep [] core_td stg_td -- all done!
 390       = (reverse core_td, reverse stg_td)
 391
 392 #       define CORE_TD(to_do) sep opts (to_do:core_td) stg_td
 393 #       define STG_TD(to_do)  sep opts core_td (to_do:stg_td)
 394 #       define IGNORE_ARG()   sep opts core_td stg_td
 395
 396     sep (opt1:opts) core_td stg_td
 397       =
 398         case (_UNPK_ opt1) of -- the non-"just match a string" options are at the end...
 399
 400           ',' : _       -> IGNORE_ARG() -- it is for the parser
 401
 402           "-fsimplify"  -> -- gather up SimplifierSwitches specially...
 403                            simpl_sep opts defaultSimplSwitches core_td stg_td
 404
 405           "-fcalc-inlinings1"-> CORE_TD(CoreDoCalcInlinings1)
 406           "-fcalc-inlinings2"-> CORE_TD(CoreDoCalcInlinings2)
 407           "-ffloat-inwards"  -> CORE_TD(CoreDoFloatInwards)
 408           "-ffull-laziness"  -> CORE_TD(CoreDoFullLaziness)
 409           "-fliberate-case"  -> CORE_TD(CoreLiberateCase)
 410           "-fprint-core"     -> CORE_TD(CoreDoPrintCore)
 411           "-fstatic-args"    -> CORE_TD(CoreDoStaticArgs)
 412           "-fstrictness"     -> CORE_TD(CoreDoStrictness)
 413           "-fspecialise"     -> CORE_TD(CoreDoSpecialising)
 414           "-ffoldr-build-worker-wrapper"  -> CORE_TD(CoreDoFoldrBuildWorkerWrapper)
 415           "-ffoldr-build-ww-anal"  -> CORE_TD(CoreDoFoldrBuildWWAnal)
 416
 417           "-fstg-static-args" -> STG_TD(StgDoStaticArgs)
 418           "-fupdate-analysis" -> STG_TD(StgDoUpdateAnalysis)
 419           "-dstg-stats"       -> STG_TD(D_stg_stats)
 420           "-flambda-lift"     -> STG_TD(StgDoLambdaLift)
 421           "-fmassage-stg-for-profiling" -> STG_TD(StgDoMassageForProfiling)
 422
 423           _ -> -- NB: the driver is really supposed to handle bad options
 424                IGNORE_ARG()
 425
 426     ----------------
 427
 428     simpl_sep :: [FAST_STRING]      -- cmd-line opts (input)
 429         -> [SimplifierSwitch]       -- simplifier-switch accumulator
 430         -> [CoreToDo] -> [StgToDo]  -- to_do accumulators
 431         -> ([CoreToDo], [StgToDo])  -- result
 432
 433         -- "simpl_sep" tailcalls "sep" once it's seen one set
 434         -- of SimplifierSwitches for a CoreDoSimplify.
 435
 436 #ifdef DEBUG
 437     simpl_sep input@[] simpl_sw core_td stg_td
 438       = panic "simpl_sep []"
 439 #endif
 440
 441         -- The SimplifierSwitches should be delimited by "[" and "]".
 442
 443     simpl_sep (opt1:opts) simpl_sw core_td stg_td
 444       = case (_UNPK_ opt1) of
 445           "[" -> simpl_sep opts simpl_sw core_td stg_td
 446           "]" -> let
 447                     this_simpl = CoreDoSimplify (isAmongSimpl simpl_sw)
 448                  in
 449                  sep opts (this_simpl : core_td) stg_td
 450
 451 #         define SIMPL_SW(sw) simpl_sep opts (sw:simpl_sw) core_td stg_td
 452
 453           -- the non-"just match a string" options are at the end...
 454           "-fshow-simplifier-progress"      -> SIMPL_SW(ShowSimplifierProgress)
 455           "-fcode-duplication-ok"           -> SIMPL_SW(SimplOkToDupCode)
 456           "-ffloat-lets-exposing-whnf"      -> SIMPL_SW(SimplFloatLetsExposingWHNF)
 457           "-ffloat-primops-ok"              -> SIMPL_SW(SimplOkToFloatPrimOps)
 458           "-falways-float-lets-from-lets"   -> SIMPL_SW(SimplAlwaysFloatLetsFromLets)
 459           "-fdo-case-elim"                  -> SIMPL_SW(SimplDoCaseElim)
 460           "-fdo-lambda-eta-expansion"       -> SIMPL_SW(SimplDoLambdaEtaExpansion)
 461           "-fdo-foldr-build"                -> SIMPL_SW(SimplDoFoldrBuild)
 462           "-fdo-not-fold-back-append"       -> SIMPL_SW(SimplDontFoldBackAppend)
 463           "-fdo-arity-expand"               -> SIMPL_SW(SimplDoArityExpand)
 464           "-fdo-inline-foldr-build"         -> SIMPL_SW(SimplDoInlineFoldrBuild)
 465           "-freuse-con"                     -> SIMPL_SW(SimplReuseCon)
 466           "-fcase-of-case"                  -> SIMPL_SW(SimplCaseOfCase)
 467           "-fcase-merge"                    -> SIMPL_SW(SimplCaseMerge)
 468           "-flet-to-case"                   -> SIMPL_SW(SimplLetToCase)
 469           "-fpedantic-bottoms"              -> SIMPL_SW(SimplPedanticBottoms)
 470           "-fkeep-spec-pragma-ids"          -> SIMPL_SW(KeepSpecPragmaIds)
 471           "-fkeep-unused-bindings"          -> SIMPL_SW(KeepUnusedBindings)
 472           "-fmay-delete-conjurable-ids"     -> SIMPL_SW(SimplMayDeleteConjurableIds)
 473           "-fessential-unfoldings-only"     -> SIMPL_SW(EssentialUnfoldingsOnly)
 474           "-fignore-inline-pragma"          -> SIMPL_SW(IgnoreINLINEPragma)
 475           "-fno-let-from-case"              -> SIMPL_SW(SimplNoLetFromCase)
 476           "-fno-let-from-app"               -> SIMPL_SW(SimplNoLetFromApp)
 477           "-fno-let-from-strict-let"        -> SIMPL_SW(SimplNoLetFromStrictLet)
 478
 479           o | starts_with_msi  -> SIMPL_SW(MaxSimplifierIterations (read after_msi))
 480            where
 481             maybe_msi           = startsWith "-fmax-simplifier-iterations"   o
 482             starts_with_msi     = maybeToBool maybe_msi
 483             (Just after_msi)    = maybe_msi
 484
 485           _ -> -- NB: the driver is really supposed to handle bad options
 486                simpl_sep opts simpl_sw core_td stg_td
 487 \end{code}
 488
 489 %************************************************************************
 490 %*                                                                      *
 491 \subsection{Switch ordering}
 492 %*                                                                      *
 493 %************************************************************************
 494
 495 In spite of the @Produce*@ and @SccGroup@ constructors, these things
 496 behave just like enumeration types.
 497
 498 \begin{code}
 499 instance Eq SimplifierSwitch where
 500     a == b = tagOf_SimplSwitch a _EQ_ tagOf_SimplSwitch b
 501
 502 instance Ord SimplifierSwitch where
 503     a <  b  = tagOf_SimplSwitch a _LT_ tagOf_SimplSwitch b
 504     a <= b  = tagOf_SimplSwitch a _LE_ tagOf_SimplSwitch b
 505
 506 tagOf_SimplSwitch SimplOkToDupCode              =(ILIT(0) :: FAST_INT)
 507 tagOf_SimplSwitch SimplFloatLetsExposingWHNF    = ILIT(1)
 508 tagOf_SimplSwitch SimplOkToFloatPrimOps         = ILIT(2)
 509 tagOf_SimplSwitch SimplAlwaysFloatLetsFromLets  = ILIT(3)
 510 tagOf_SimplSwitch SimplDoCaseElim               = ILIT(4)
 511 tagOf_SimplSwitch SimplReuseCon                 = ILIT(5)
 512 tagOf_SimplSwitch SimplCaseOfCase               = ILIT(6)
 513 tagOf_SimplSwitch SimplLetToCase                = ILIT(7)
 514 tagOf_SimplSwitch SimplMayDeleteConjurableIds   = ILIT(9)
 515 tagOf_SimplSwitch SimplPedanticBottoms          = ILIT(10)
 516 tagOf_SimplSwitch SimplDoArityExpand            = ILIT(11)
 517 tagOf_SimplSwitch SimplDoFoldrBuild             = ILIT(12)
 518 tagOf_SimplSwitch SimplDoInlineFoldrBuild       = ILIT(14)
 519 tagOf_SimplSwitch IgnoreINLINEPragma            = ILIT(15)
 520 tagOf_SimplSwitch SimplDoLambdaEtaExpansion     = ILIT(16)
 521 tagOf_SimplSwitch EssentialUnfoldingsOnly       = ILIT(19)
 522 tagOf_SimplSwitch ShowSimplifierProgress        = ILIT(20)
 523 tagOf_SimplSwitch (MaxSimplifierIterations _)   = ILIT(21)
 524 tagOf_SimplSwitch KeepSpecPragmaIds             = ILIT(25)
 525 tagOf_SimplSwitch KeepUnusedBindings            = ILIT(26)
 526 tagOf_SimplSwitch SimplNoLetFromCase            = ILIT(27)
 527 tagOf_SimplSwitch SimplNoLetFromApp             = ILIT(28)
 528 tagOf_SimplSwitch SimplNoLetFromStrictLet       = ILIT(29)
 529 tagOf_SimplSwitch SimplDontFoldBackAppend       = ILIT(30)
 530 tagOf_SimplSwitch SimplCaseMerge                = ILIT(31)
 531 tagOf_SimplSwitch SimplCaseScrutinee            = ILIT(32)
 532
 533 -- If you add anything here, be sure to change lAST_SIMPL_SWITCH_TAG, too!
 534
 535 tagOf_SimplSwitch _ = panic# "tagOf_SimplSwitch"
 536
 537 lAST_SIMPL_SWITCH_TAG = IBOX(tagOf_SimplSwitch SimplCaseScrutinee)
 538 \end{code}
 539
 540 %************************************************************************
 541 %*                                                                      *
 542 \subsection{Switch lookup}
 543 %*                                                                      *
 544 %************************************************************************
 545
 546 \begin{code}
 547 #if __GLASGOW_HASKELL__ == 201
 548 # define ARRAY      Array
 549 # define LIFT       GHCbase.Lift
 550 # define SET_TO     =:
 551 (=:) a b = (a,b)
 552 #elif __GLASGOW_HASKELL__ >= 202
 553 # define ARRAY      Array
 554 # define LIFT       Lift
 555 # define SET_TO     =:
 556 (=:) a b = (a,b)
 557 #else
 558 # define ARRAY      _Array
 559 # define LIFT       _Lift
 560 # define SET_TO     :=
 561 #endif
 562
 563 isAmongSimpl :: [SimplifierSwitch] -> SimplifierSwitch -> SwitchResult
 564
 565 isAmongSimpl on_switches                -- Switches mentioned later occur *earlier*
 566                                         -- in the list; defaults right at the end.
 567   = let
 568         tidied_on_switches = foldl rm_dups [] on_switches
 569                 -- The fold*l* ensures that we keep the latest switches;
 570                 -- ie the ones that occur earliest in the list.
 571
 572         sw_tbl :: Array Int SwitchResult
 573
 574         sw_tbl = (array (0, lAST_SIMPL_SWITCH_TAG) -- bounds...
 575                         all_undefined)
 576                  // defined_elems
 577
 578         all_undefined = [ i SET_TO SwBool False | i <- [0 .. lAST_SIMPL_SWITCH_TAG ] ]
 579
 580         defined_elems = map mk_assoc_elem tidied_on_switches
 581     in
 582     -- (avoid some unboxing, bounds checking, and other horrible things:)
 583     case sw_tbl of { ARRAY bounds_who_needs_'em stuff ->
 584     \ switch ->
 585         case (indexArray# stuff (tagOf_SimplSwitch switch)) of
 586           LIFT v -> v
 587     }
 588   where
 589     mk_assoc_elem k@(MaxSimplifierIterations lvl)       = IBOX(tagOf_SimplSwitch k) SET_TO SwInt lvl
 590
 591     mk_assoc_elem k = IBOX(tagOf_SimplSwitch k) SET_TO SwBool   True -- I'm here, Mom!
 592
 593     -- cannot have duplicates if we are going to use the array thing
 594     rm_dups switches_so_far switch
 595       = if switch `is_elem` switches_so_far
 596         then switches_so_far
 597         else switch : switches_so_far
 598       where
 599         sw `is_elem` []     = False
 600         sw `is_elem` (s:ss) = (tagOf_SimplSwitch sw) _EQ_ (tagOf_SimplSwitch s)
 601                             || sw `is_elem` ss
 602 \end{code}
 603
 604 Default settings for simplifier switches
 605
 606 \begin{code}
 607 defaultSimplSwitches = [MaxSimplifierIterations         1
 608                        ]
 609 \end{code}
 610
 611 %************************************************************************
 612 %*                                                                      *
 613 \subsection{Misc functions for command-line options}
 614 %*                                                                      *
 615 %************************************************************************
 616
 617
 618 \begin{code}
 619 switchIsOn :: (switch -> SwitchResult) -> switch -> Bool
 620
 621 switchIsOn lookup_fn switch
 622   = case (lookup_fn switch) of
 623       SwBool False -> False
 624       _            -> True
 625
 626 stringSwitchSet :: (switch -> SwitchResult)
 627                 -> (FAST_STRING -> switch)
 628                 -> Maybe FAST_STRING
 629
 630 stringSwitchSet lookup_fn switch
 631   = case (lookup_fn (switch (panic "stringSwitchSet"))) of
 632       SwString str -> Just str
 633       _            -> Nothing
 634
 635 intSwitchSet :: (switch -> SwitchResult)
 636              -> (Int -> switch)
 637              -> Maybe Int
 638
 639 intSwitchSet lookup_fn switch
 640   = case (lookup_fn (switch (panic "intSwitchSet"))) of
 641       SwInt int -> Just int
 642       _         -> Nothing
 643 \end{code}