ghc/compiler/main/CmdLineOpts.lhs

   1 %
   2 % (c) The AQUA Project, Glasgow University, 1996-98
   3 %
   4 \section[CmdLineOpts]{Things to do with command-line options}
   5
   6 \begin{code}
   7 module CmdLineOpts (
   8         CoreToDo(..),
   9         SimplifierSwitch(..),
  10         StgToDo(..),
  11         SwitchResult(..),
  12         classifyOpts,
  13
  14         intSwitchSet,
  15         switchIsOn,
  16
  17         src_filename,
  18
  19         -- debugging opts
  20         opt_D_dump_absC,
  21         opt_D_dump_asm,
  22         opt_D_dump_cpranal,
  23         opt_D_dump_cse,
  24         opt_D_dump_deriv,
  25         opt_D_dump_ds,
  26         opt_D_dump_flatC,
  27         opt_D_dump_foreign,
  28         opt_D_dump_inlinings,
  29         opt_D_dump_occur_anal,
  30         opt_D_dump_parsed,
  31         opt_D_dump_realC,
  32         opt_D_dump_rn,
  33         opt_D_dump_rules,
  34         opt_D_dump_simpl,
  35         opt_D_dump_simpl_iterations,
  36         opt_D_dump_simpl_stats,
  37         opt_D_dump_spec,
  38         opt_D_dump_stg,
  39         opt_D_dump_stranal,
  40         opt_D_dump_tc,
  41         opt_D_dump_usagesp,
  42         opt_D_dump_worker_wrapper,
  43         opt_D_show_passes,
  44         opt_D_dump_rn_trace,
  45         opt_D_dump_rn_stats,
  46         opt_D_source_stats,
  47         opt_D_verbose_core2core,
  48         opt_D_verbose_stg2stg,
  49         opt_DoCoreLinting,
  50         opt_DoStgLinting,
  51         opt_DoUSPLinting,
  52         opt_PprStyle_Debug,
  53         opt_PprStyle_NoPrags,
  54         opt_PprUserLength,
  55
  56         -- warning opts
  57         opt_WarnDuplicateExports,
  58         opt_WarnHiShadows,
  59         opt_WarnIncompletePatterns,
  60         opt_WarnMissingMethods,
  61         opt_WarnMissingSigs,
  62         opt_WarnNameShadowing,
  63         opt_WarnOverlappingPatterns,
  64         opt_WarnSimplePatterns,
  65         opt_WarnTypeDefaults,
  66         opt_WarnUnusedBinds,
  67         opt_WarnUnusedImports,
  68         opt_WarnUnusedMatches,
  69
  70         -- profiling opts
  71         opt_AutoSccsOnAllToplevs,
  72         opt_AutoSccsOnExportedToplevs,
  73         opt_AutoSccsOnIndividualCafs,
  74         opt_AutoSccsOnDicts,
  75         opt_SccGroup,
  76         opt_SccProfilingOn,
  77         opt_DoTickyProfiling,
  78
  79         -- language opts
  80         opt_AllStrict,
  81         opt_DictsStrict,
  82         opt_MaxContextReductionDepth,
  83         opt_AllowOverlappingInstances,
  84         opt_AllowUndecidableInstances,
  85         opt_GlasgowExts,
  86         opt_IrrefutableTuples,
  87         opt_NumbersStrict,
  88         opt_Parallel,
  89
  90         -- optimisation opts
  91         opt_DoEtaReduction,
  92         opt_DoSemiTagging,
  93         opt_FoldrBuildOn,
  94         opt_LiberateCaseThreshold,
  95         opt_NoPreInlining,
  96         opt_StgDoLetNoEscapes,
  97         opt_UnfoldCasms,
  98         opt_UsageSPOn,
  99         opt_UnboxStrictFields,
 100         opt_SimplNoPreInlining,
 101         opt_SimplDoEtaReduction,
 102         opt_SimplDoCaseElim,
 103         opt_SimplDoLambdaEtaExpansion,
 104         opt_SimplCaseOfCase,
 105         opt_SimplCaseMerge,
 106         opt_SimplLetToCase,
 107         opt_SimplPedanticBottoms,
 108
 109         -- Unfolding control
 110         opt_UF_HiFileThreshold,
 111         opt_UF_CreationThreshold,
 112         opt_UF_UseThreshold,
 113         opt_UF_ScrutConDiscount,
 114         opt_UF_FunAppDiscount,
 115         opt_UF_PrimArgDiscount,
 116         opt_UF_KeenessFactor,
 117         opt_UF_CheapOp,
 118         opt_UF_DearOp,
 119         opt_UF_NoRepLit,
 120
 121         -- misc opts
 122         opt_CompilingPrelude,
 123         opt_EmitCExternDecls,
 124         opt_EnsureSplittableC,
 125         opt_GranMacros,
 126         opt_HiMap,
 127         opt_HiVersion,
 128         opt_HistorySize,
 129         opt_IgnoreAsserts,
 130         opt_IgnoreIfacePragmas,
 131         opt_NoHiCheck,
 132         opt_NoImplicitPrelude,
 133         opt_OmitBlackHoling,
 134         opt_OmitInterfacePragmas,
 135         opt_ProduceC,
 136         opt_ProduceExportCStubs,
 137         opt_ProduceExportHStubs,
 138         opt_ProduceHi,
 139         opt_ProduceS,
 140         opt_NoPruneDecls,
 141         opt_ReportCompile,
 142         opt_SourceUnchanged,
 143         opt_Static,
 144         opt_Unregisterised,
 145         opt_Verbose,
 146
 147         -- Code generation
 148         opt_UseVanillaRegs,
 149         opt_UseFloatRegs,
 150         opt_UseDoubleRegs,
 151         opt_UseLongRegs
 152     ) where
 153
 154 #include "HsVersions.h"
 155
 156 import Array    ( array, (//) )
 157 import GlaExts
 158 import Argv
 159 import Constants        -- Default values for some flags
 160
 161 import FastString       ( headFS )
 162 import Maybes           ( assocMaybe, firstJust, maybeToBool )
 163 import Panic            ( panic, panic# )
 164
 165 #if __GLASGOW_HASKELL__ < 301
 166 import ArrBase  ( Array(..) )
 167 #else
 168 import PrelArr  ( Array(..) )
 169 #endif
 170 \end{code}
 171
 172 A command-line {\em switch} is (generally) either on or off; e.g., the
 173 ``verbose'' (-v) switch is either on or off.  (The \tr{-G<group>}
 174 switch is an exception; it's set to a string, or nothing.)
 175
 176 A list of {\em ToDo}s is things to be done in a particular part of
 177 processing.  A (fictitious) example for the Core-to-Core simplifier
 178 might be: run the simplifier, then run the strictness analyser, then
 179 run the simplifier again (three ``todos'').
 180
 181 There are three ``to-do processing centers'' at the moment.  In the
 182 main loop (\tr{main/Main.lhs}), in the Core-to-Core processing loop
 183 (\tr{simplCore/SimplCore.lhs), and in the STG-to-STG processing loop
 184 (\tr{simplStg/SimplStg.lhs}).
 185
 186
 187 %************************************************************************
 188 %*                                                                      *
 189 \subsection{Datatypes associated with command-line options}
 190 %*                                                                      *
 191 %************************************************************************
 192
 193 \begin{code}
 194 data SwitchResult
 195   = SwBool      Bool            -- on/off
 196   | SwString    FAST_STRING     -- nothing or a String
 197   | SwInt       Int             -- nothing or an Int
 198 \end{code}
 199
 200 \begin{code}
 201 data CoreToDo           -- These are diff core-to-core passes,
 202                         -- which may be invoked in any order,
 203                         -- as many times as you like.
 204
 205   = CoreDoSimplify      -- The core-to-core simplifier.
 206         (SimplifierSwitch -> SwitchResult)
 207                         -- Each run of the simplifier can take a different
 208                         -- set of simplifier-specific flags.
 209   | CoreDoFloatInwards
 210   | CoreDoFullLaziness
 211   | CoreLiberateCase
 212   | CoreDoPrintCore
 213   | CoreDoStaticArgs
 214   | CoreDoStrictness
 215   | CoreDoWorkerWrapper
 216   | CoreDoSpecialising
 217   | CoreDoUSPInf
 218   | CoreDoCPResult
 219   | CoreCSE
 220 \end{code}
 221
 222 \begin{code}
 223 data StgToDo
 224   = StgDoStaticArgs
 225   | StgDoUpdateAnalysis
 226   | StgDoLambdaLift
 227   | StgDoMassageForProfiling  -- should be (next to) last
 228   -- There's also setStgVarInfo, but its absolute "lastness"
 229   -- is so critical that it is hardwired in (no flag).
 230   | D_stg_stats
 231 \end{code}
 232
 233 \begin{code}
 234 data SimplifierSwitch
 235   = MaxSimplifierIterations Int
 236   | SimplInlinePhase Int
 237 \end{code}
 238
 239 %************************************************************************
 240 %*                                                                      *
 241 \subsection{Classifying command-line options}
 242 %*                                                                      *
 243 %************************************************************************
 244
 245 \begin{code}
 246 lookUp           :: FAST_STRING -> Bool
 247 lookup_int       :: String -> Maybe Int
 248 lookup_def_int   :: String -> Int -> Int
 249 lookup_def_float :: String -> Float -> Float
 250 lookup_str       :: String -> Maybe String
 251
 252 lookUp     sw = maybeToBool (assoc_opts sw)
 253
 254 lookup_str sw = firstJust (map (startsWith sw) unpacked_opts)
 255
 256 lookup_int sw = case (lookup_str sw) of
 257                   Nothing -> Nothing
 258                   Just xx -> Just (read xx)
 259
 260 lookup_def_int sw def = case (lookup_str sw) of
 261                             Nothing -> def              -- Use default
 262                             Just xx -> read xx
 263
 264 lookup_def_float sw def = case (lookup_str sw) of
 265                             Nothing -> def              -- Use default
 266                             Just xx -> read xx
 267
 268 assoc_opts    = assocMaybe [ (a, True) | a <- argv ]
 269 unpacked_opts = map _UNPK_ argv
 270
 271 {-
 272  Putting the compiler options into temporary at-files
 273  may turn out to be necessary later on if we turn hsc into
 274  a pure Win32 application where I think there's a command-line
 275  length limit of 255. unpacked_opts understands the @ option.
 276
 277 assoc_opts    = assocMaybe [ (_PK_ a, True) | a <- unpacked_opts ]
 278
 279 unpacked_opts :: [String]
 280 unpacked_opts =
 281   concat $
 282   map (expandAts) $
 283   map _UNPK_ argv
 284   where
 285    expandAts ('@':fname) = words (unsafePerformIO (readFile fname))
 286    expandAts l = [l]
 287 -}
 288 \end{code}
 289
 290 \begin{code}
 291 src_filename :: FAST_STRING
 292 src_filename = case argv of
 293                   filename : rest | headFS filename /= '-' -> filename
 294                   otherwise -> panic "no filename"
 295 \end{code}
 296
 297 \begin{code}
 298 -- debugging opts
 299 opt_D_dump_absC                 = lookUp  SLIT("-ddump-absC")
 300 opt_D_dump_asm                  = lookUp  SLIT("-ddump-asm")
 301 opt_D_dump_cpranal              = lookUp  SLIT("-ddump-cpranalyse")
 302 opt_D_dump_deriv                = lookUp  SLIT("-ddump-deriv")
 303 opt_D_dump_ds                   = lookUp  SLIT("-ddump-ds")
 304 opt_D_dump_flatC                = lookUp  SLIT("-ddump-flatC")
 305 opt_D_dump_foreign              = lookUp  SLIT("-ddump-foreign-stubs")
 306 opt_D_dump_inlinings            = lookUp  SLIT("-ddump-inlinings")
 307 opt_D_dump_occur_anal           = lookUp  SLIT("-ddump-occur-anal")
 308 opt_D_dump_parsed               = lookUp  SLIT("-ddump-parsed")
 309 opt_D_dump_realC                = lookUp  SLIT("-ddump-realC")
 310 opt_D_dump_rn                   = lookUp  SLIT("-ddump-rn")
 311 opt_D_dump_simpl                = lookUp  SLIT("-ddump-simpl")
 312 opt_D_dump_simpl_iterations     = lookUp  SLIT("-ddump-simpl-iterations")
 313 opt_D_dump_spec                 = lookUp  SLIT("-ddump-spec")
 314 opt_D_dump_stg                  = lookUp  SLIT("-ddump-stg")
 315 opt_D_dump_stranal              = lookUp  SLIT("-ddump-stranal")
 316 opt_D_dump_tc                   = lookUp  SLIT("-ddump-tc")
 317 opt_D_dump_rules                = lookUp  SLIT("-ddump-rules")
 318 opt_D_dump_usagesp              = lookUp  SLIT("-ddump-usagesp")
 319 opt_D_dump_cse                  = lookUp  SLIT("-ddump-cse")
 320 opt_D_dump_worker_wrapper       = lookUp  SLIT("-ddump-workwrap")
 321 opt_D_show_passes               = lookUp  SLIT("-dshow-passes")
 322 opt_D_dump_rn_trace             = lookUp  SLIT("-ddump-rn-trace")
 323 opt_D_dump_rn_stats             = lookUp  SLIT("-ddump-rn-stats")
 324 opt_D_dump_simpl_stats          = lookUp  SLIT("-ddump-simpl-stats")
 325 opt_D_source_stats              = lookUp  SLIT("-dsource-stats")
 326 opt_D_verbose_core2core         = lookUp  SLIT("-dverbose-simpl")
 327 opt_D_verbose_stg2stg           = lookUp  SLIT("-dverbose-stg")
 328 opt_DoCoreLinting               = lookUp  SLIT("-dcore-lint")
 329 opt_DoStgLinting                = lookUp  SLIT("-dstg-lint")
 330 opt_DoUSPLinting                = lookUp  SLIT("-dusagesp-lint")
 331 opt_PprStyle_NoPrags            = lookUp  SLIT("-dppr-noprags")
 332 opt_PprStyle_Debug              = lookUp  SLIT("-dppr-debug")
 333 opt_PprUserLength               = lookup_def_int "-dppr-user-length" 5 --ToDo: give this a name
 334
 335 -- warning opts
 336 opt_WarnDuplicateExports        = lookUp  SLIT("-fwarn-duplicate-exports")
 337 opt_WarnHiShadows               = lookUp  SLIT("-fwarn-hi-shadowing")
 338 opt_WarnIncompletePatterns      = lookUp  SLIT("-fwarn-incomplete-patterns")
 339 opt_WarnMissingMethods          = lookUp  SLIT("-fwarn-missing-methods")
 340 opt_WarnMissingSigs             = lookUp  SLIT("-fwarn-missing-signatures")
 341 opt_WarnNameShadowing           = lookUp  SLIT("-fwarn-name-shadowing")
 342 opt_WarnOverlappingPatterns     = lookUp  SLIT("-fwarn-overlapping-patterns")
 343 opt_WarnSimplePatterns          = lookUp  SLIT("-fwarn-simple-patterns")
 344 opt_WarnTypeDefaults            = lookUp  SLIT("-fwarn-type-defaults")
 345 opt_WarnUnusedBinds             = lookUp  SLIT("-fwarn-unused-binds")
 346 opt_WarnUnusedImports           = lookUp  SLIT("-fwarn-unused-imports")
 347 opt_WarnUnusedMatches           = lookUp  SLIT("-fwarn-unused-matches")
 348
 349 -- profiling opts
 350 opt_AutoSccsOnAllToplevs        = lookUp  SLIT("-fauto-sccs-on-all-toplevs")
 351 opt_AutoSccsOnExportedToplevs   = lookUp  SLIT("-fauto-sccs-on-exported-toplevs")
 352 opt_AutoSccsOnIndividualCafs    = lookUp  SLIT("-fauto-sccs-on-individual-cafs")
 353 opt_AutoSccsOnDicts             = lookUp  SLIT("-fauto-sccs-on-dicts")
 354 opt_SccGroup                    = lookup_str "-G="
 355 opt_SccProfilingOn              = lookUp  SLIT("-fscc-profiling")
 356 opt_DoTickyProfiling            = lookUp  SLIT("-fticky-ticky")
 357
 358 -- language opts
 359 opt_AllStrict                   = lookUp  SLIT("-fall-strict")
 360 opt_DictsStrict                 = lookUp  SLIT("-fdicts-strict")
 361 opt_AllowOverlappingInstances   = lookUp  SLIT("-fallow-overlapping-instances")
 362 opt_AllowUndecidableInstances   = lookUp  SLIT("-fallow-undecidable-instances")
 363 opt_GlasgowExts                 = lookUp  SLIT("-fglasgow-exts")
 364 opt_IrrefutableTuples           = lookUp  SLIT("-firrefutable-tuples")
 365 opt_MaxContextReductionDepth    = lookup_def_int "-fcontext-stack" mAX_CONTEXT_REDUCTION_DEPTH
 366 opt_NumbersStrict               = lookUp  SLIT("-fnumbers-strict")
 367 opt_Parallel                    = lookUp  SLIT("-fparallel")
 368
 369 -- optimisation opts
 370 opt_DoEtaReduction              = lookUp  SLIT("-fdo-eta-reduction")
 371 opt_DoSemiTagging               = lookUp  SLIT("-fsemi-tagging")
 372 opt_FoldrBuildOn                = lookUp  SLIT("-ffoldr-build-on")
 373 opt_LiberateCaseThreshold       = lookup_def_int "-fliberate-case-threshold" (10::Int)
 374 opt_NoPreInlining               = lookUp  SLIT("-fno-pre-inlining")
 375 opt_StgDoLetNoEscapes           = lookUp  SLIT("-flet-no-escape")
 376 opt_UnfoldCasms                 = lookUp SLIT("-funfold-casms-in-hi-file")
 377 opt_UsageSPOn                   = lookUp  SLIT("-fusagesp-on")
 378 opt_UnboxStrictFields           = lookUp  SLIT("-funbox-strict-fields")
 379
 380   {-
 381    It's a bit unfortunate to have to re-introduce this chap, but on Win32
 382    platforms we do need a way of distinguishing between the case when we're
 383    compiling a static version of the Prelude and one that's going to be
 384    put into a DLL. Why? Because the compiler's wired in modules need to
 385    be attributed as either coming from a DLL or not.
 386   -}
 387 opt_CompilingPrelude            = lookUp  SLIT("-fcompiling-prelude")
 388 opt_EmitCExternDecls            = lookUp  SLIT("-femit-extern-decls")
 389 opt_EnsureSplittableC           = lookUp  SLIT("-fglobalise-toplev-names")
 390 opt_GranMacros                  = lookUp  SLIT("-fgransim")
 391 opt_HiMap                       = lookup_str "-himap="       -- file saying where to look for .hi files
 392 opt_HiVersion                   = lookup_def_int "-fhi-version=" 0 -- what version we're compiling.
 393 opt_HistorySize                 = lookup_def_int "-fhistory-size" 20
 394 opt_IgnoreAsserts               = lookUp  SLIT("-fignore-asserts")
 395 opt_IgnoreIfacePragmas          = lookUp  SLIT("-fignore-interface-pragmas")
 396 opt_NoHiCheck                   = lookUp  SLIT("-fno-hi-version-check")
 397 opt_NoImplicitPrelude           = lookUp  SLIT("-fno-implicit-prelude")
 398 opt_OmitBlackHoling             = lookUp  SLIT("-dno-black-holing")
 399 opt_OmitInterfacePragmas        = lookUp  SLIT("-fomit-interface-pragmas")
 400 opt_ProduceC                    = lookup_str "-C="
 401 opt_ProduceExportCStubs         = lookup_str "-F="
 402 opt_ProduceExportHStubs         = lookup_str "-FH="
 403 opt_ProduceHi                   = lookup_str "-hifile=" -- the one to produce this time
 404
 405 -- Simplifier switches
 406 opt_SimplNoPreInlining          = lookUp SLIT("-fno-pre-inlining")
 407         -- NoPreInlining is there just to see how bad things
 408         -- get if you don't do it!
 409 opt_SimplDoEtaReduction         = lookUp SLIT("-fdo-eta-reduction")
 410 opt_SimplDoCaseElim             = lookUp SLIT("-fdo-case-elim")
 411 opt_SimplDoLambdaEtaExpansion   = lookUp SLIT("-fdo-lambda-eta-expansion")
 412 opt_SimplCaseOfCase             = lookUp SLIT("-fcase-of-case")
 413 opt_SimplCaseMerge              = lookUp SLIT("-fcase-merge")
 414 opt_SimplLetToCase              = lookUp SLIT("-flet-to-case")
 415 opt_SimplPedanticBottoms        = lookUp SLIT("-fpedantic-bottoms")
 416
 417 -- Unfolding control
 418 opt_UF_HiFileThreshold          = lookup_def_int "-funfolding-interface-threshold" (30::Int)
 419 opt_UF_CreationThreshold        = lookup_def_int "-funfolding-creation-threshold"  (30::Int)
 420 opt_UF_UseThreshold             = lookup_def_int "-funfolding-use-threshold"       (8::Int)     -- Discounts can be big
 421 opt_UF_ScrutConDiscount         = lookup_def_int "-funfolding-con-discount"        (3::Int)
 422 opt_UF_FunAppDiscount           = lookup_def_int "-funfolding-fun-discount"        (6::Int)     -- It's great to inline a fn
 423 opt_UF_PrimArgDiscount          = lookup_def_int "-funfolding-prim-discount"       (1::Int)
 424 opt_UF_KeenessFactor            = lookup_def_float "-funfolding-keeness-factor"    (2.0::Float)
 425
 426 opt_UF_CheapOp  = ( 0 :: Int)   -- Only one instruction; and the args are charged for
 427 opt_UF_DearOp   = ( 4 :: Int)
 428 opt_UF_NoRepLit = ( 20 :: Int)  -- Strings can be pretty big
 429
 430 opt_ProduceS                    = lookup_str "-S="
 431 opt_ReportCompile               = lookUp SLIT("-freport-compile")
 432 opt_NoPruneDecls                = lookUp SLIT("-fno-prune-decls")
 433 opt_SourceUnchanged             = lookUp SLIT("-fsource-unchanged")
 434 opt_Static                      = lookUp SLIT("-static")
 435 opt_Unregisterised              = lookUp SLIT("-funregisterised")
 436 opt_Verbose                     = lookUp SLIT("-v")
 437
 438 opt_UseVanillaRegs | opt_Unregisterised = 0
 439                    | otherwise          = mAX_Real_Vanilla_REG
 440 opt_UseFloatRegs   | opt_Unregisterised = 0
 441                    | otherwise          = mAX_Real_Float_REG
 442 opt_UseDoubleRegs  | opt_Unregisterised = 0
 443                    | otherwise          = mAX_Real_Double_REG
 444 opt_UseLongRegs    | opt_Unregisterised = 0
 445                    | otherwise          = mAX_Real_Long_REG
 446 \end{code}
 447
 448 \begin{code}
 449 classifyOpts :: ([CoreToDo],    -- Core-to-Core processing spec
 450                  [StgToDo])     -- STG-to-STG   processing spec
 451
 452 classifyOpts = sep argv [] [] -- accumulators...
 453   where
 454     sep :: [FAST_STRING]                 -- cmd-line opts (input)
 455         -> [CoreToDo] -> [StgToDo]       -- to_do accumulators
 456         -> ([CoreToDo], [StgToDo])       -- result
 457
 458     sep [] core_td stg_td -- all done!
 459       = (reverse core_td, reverse stg_td)
 460
 461 #       define CORE_TD(to_do) sep opts (to_do:core_td) stg_td
 462 #       define STG_TD(to_do)  sep opts core_td (to_do:stg_td)
 463
 464     sep (opt1:opts) core_td stg_td
 465       = case (_UNPK_ opt1) of -- the non-"just match a string" options are at the end...
 466           ',' : _       -> sep opts core_td stg_td -- it is for the parser
 467
 468           "-fsimplify"  -> -- gather up SimplifierSwitches specially...
 469                            simpl_sep opts defaultSimplSwitches core_td stg_td
 470
 471           "-ffloat-inwards"  -> CORE_TD(CoreDoFloatInwards)
 472           "-ffull-laziness"  -> CORE_TD(CoreDoFullLaziness)
 473           "-fliberate-case"  -> CORE_TD(CoreLiberateCase)
 474           "-fcse"            -> CORE_TD(CoreCSE)
 475           "-fprint-core"     -> CORE_TD(CoreDoPrintCore)
 476           "-fstatic-args"    -> CORE_TD(CoreDoStaticArgs)
 477           "-fstrictness"     -> CORE_TD(CoreDoStrictness)
 478           "-fworker-wrapper" -> CORE_TD(CoreDoWorkerWrapper)
 479           "-fspecialise"     -> CORE_TD(CoreDoSpecialising)
 480           "-fusagesp"        -> CORE_TD(CoreDoUSPInf)
 481           "-fcpr-analyse"    -> CORE_TD(CoreDoCPResult)
 482
 483           "-fstg-static-args" -> STG_TD(StgDoStaticArgs)
 484           "-fupdate-analysis" -> STG_TD(StgDoUpdateAnalysis)
 485           "-dstg-stats"       -> STG_TD(D_stg_stats)
 486           "-flambda-lift"     -> STG_TD(StgDoLambdaLift)
 487           "-fmassage-stg-for-profiling" -> STG_TD(StgDoMassageForProfiling)
 488
 489           _ -> -- NB: the driver is really supposed to handle bad options
 490                sep opts core_td stg_td
 491
 492     ----------------
 493
 494     simpl_sep :: [FAST_STRING]            -- cmd-line opts (input)
 495               -> [SimplifierSwitch]       -- simplifier-switch accumulator
 496               -> [CoreToDo] -> [StgToDo]  -- to_do accumulators
 497               -> ([CoreToDo], [StgToDo])  -- result
 498
 499         -- "simpl_sep" tailcalls "sep" once it's seen one set
 500         -- of SimplifierSwitches for a CoreDoSimplify.
 501
 502 #ifdef DEBUG
 503     simpl_sep input@[] simpl_sw core_td stg_td
 504       = panic "simpl_sep []"
 505 #endif
 506
 507         -- The SimplifierSwitches should be delimited by "[" and "]".
 508
 509     simpl_sep (opt1:opts) simpl_sw core_td stg_td
 510       = case (_UNPK_ opt1) of
 511           "[" -> simpl_sep opts simpl_sw core_td stg_td
 512           "]" -> let
 513                     this_simpl = CoreDoSimplify (isAmongSimpl simpl_sw)
 514                  in
 515                  sep opts (this_simpl : core_td) stg_td
 516
 517           opt -> case matchSimplSw opt of
 518                         Just sw -> simpl_sep opts (sw:simpl_sw) core_td stg_td
 519                         Nothing -> simpl_sep opts simpl_sw      core_td stg_td
 520
 521 matchSimplSw opt
 522   = firstJust   [ matchSwInt  opt "-fmax-simplifier-iterations"         MaxSimplifierIterations
 523                 , matchSwInt  opt "-finline-phase"                      SimplInlinePhase
 524                 ]
 525
 526 matchSwBool :: String -> String -> a -> Maybe a
 527 matchSwBool opt str sw | opt == str = Just sw
 528                        | otherwise  = Nothing
 529
 530 matchSwInt :: String -> String -> (Int -> a) -> Maybe a
 531 matchSwInt opt str sw = case startsWith str opt of
 532                             Just opt_left -> Just (sw (read opt_left))
 533                             Nothing       -> Nothing
 534 \end{code}
 535
 536 %************************************************************************
 537 %*                                                                      *
 538 \subsection{Switch ordering}
 539 %*                                                                      *
 540 %************************************************************************
 541
 542 In spite of the @Produce*@ and @SccGroup@ constructors, these things
 543 behave just like enumeration types.
 544
 545 \begin{code}
 546 instance Eq SimplifierSwitch where
 547     a == b = tagOf_SimplSwitch a _EQ_ tagOf_SimplSwitch b
 548
 549 instance Ord SimplifierSwitch where
 550     a <  b  = tagOf_SimplSwitch a _LT_ tagOf_SimplSwitch b
 551     a <= b  = tagOf_SimplSwitch a _LE_ tagOf_SimplSwitch b
 552
 553
 554 tagOf_SimplSwitch (SimplInlinePhase _)          = ILIT(1)
 555 tagOf_SimplSwitch (MaxSimplifierIterations _)   = ILIT(2)
 556
 557 -- If you add anything here, be sure to change lAST_SIMPL_SWITCH_TAG, too!
 558
 559 lAST_SIMPL_SWITCH_TAG = 2
 560 \end{code}
 561
 562 %************************************************************************
 563 %*                                                                      *
 564 \subsection{Switch lookup}
 565 %*                                                                      *
 566 %************************************************************************
 567
 568 \begin{code}
 569 isAmongSimpl :: [SimplifierSwitch] -> SimplifierSwitch -> SwitchResult
 570
 571 isAmongSimpl on_switches                -- Switches mentioned later occur *earlier*
 572                                         -- in the list; defaults right at the end.
 573   = let
 574         tidied_on_switches = foldl rm_dups [] on_switches
 575                 -- The fold*l* ensures that we keep the latest switches;
 576                 -- ie the ones that occur earliest in the list.
 577
 578         sw_tbl :: Array Int SwitchResult
 579         sw_tbl = (array (0, lAST_SIMPL_SWITCH_TAG) -- bounds...
 580                         all_undefined)
 581                  // defined_elems
 582
 583         all_undefined = [ (i, SwBool False) | i <- [0 .. lAST_SIMPL_SWITCH_TAG ] ]
 584
 585         defined_elems = map mk_assoc_elem tidied_on_switches
 586     in
 587     -- (avoid some unboxing, bounds checking, and other horrible things:)
 588     case sw_tbl of { Array bounds_who_needs_'em stuff ->
 589     \ switch ->
 590         case (indexArray# stuff (tagOf_SimplSwitch switch)) of
 591 #if __GLASGOW_HASKELL__ < 400
 592           Lift v -> v
 593 #elif __GLASGOW_HASKELL__ < 403
 594           (# _, v #) -> v
 595 #else
 596           (# v #) -> v
 597 #endif
 598     }
 599   where
 600     mk_assoc_elem k@(MaxSimplifierIterations lvl) = (IBOX(tagOf_SimplSwitch k), SwInt lvl)
 601     mk_assoc_elem k@(SimplInlinePhase n)          = (IBOX(tagOf_SimplSwitch k), SwInt n)
 602     mk_assoc_elem k                               = (IBOX(tagOf_SimplSwitch k), SwBool True) -- I'm here, Mom!
 603
 604     -- cannot have duplicates if we are going to use the array thing
 605     rm_dups switches_so_far switch
 606       = if switch `is_elem` switches_so_far
 607         then switches_so_far
 608         else switch : switches_so_far
 609       where
 610         sw `is_elem` []     = False
 611         sw `is_elem` (s:ss) = (tagOf_SimplSwitch sw) _EQ_ (tagOf_SimplSwitch s)
 612                             || sw `is_elem` ss
 613 \end{code}
 614
 615 Default settings for simplifier switches
 616
 617 \begin{code}
 618 defaultSimplSwitches = [MaxSimplifierIterations 1]
 619 \end{code}
 620
 621 %************************************************************************
 622 %*                                                                      *
 623 \subsection{Misc functions for command-line options}
 624 %*                                                                      *
 625 %************************************************************************
 626
 627
 628 \begin{code}
 629 switchIsOn :: (switch -> SwitchResult) -> switch -> Bool
 630
 631 switchIsOn lookup_fn switch
 632   = case (lookup_fn switch) of
 633       SwBool False -> False
 634       _            -> True
 635
 636 intSwitchSet :: (switch -> SwitchResult)
 637              -> (Int -> switch)
 638              -> Maybe Int
 639
 640 intSwitchSet lookup_fn switch
 641   = case (lookup_fn (switch (panic "intSwitchSet"))) of
 642       SwInt int -> Just int
 643       _         -> Nothing
 644 \end{code}
 645
 646 \begin{code}
 647 startsWith :: String -> String -> Maybe String
 648 -- startsWith pfx (pfx++rest) = Just rest
 649
 650 startsWith []     str = Just str
 651 startsWith (c:cs) (s:ss)
 652   = if c /= s then Nothing else startsWith cs ss
 653 startsWith  _     []  = Nothing
 654
 655 endsWith  :: String -> String -> Maybe String
 656 endsWith cs ss
 657   = case (startsWith (reverse cs) (reverse ss)) of
 658       Nothing -> Nothing
 659       Just rs -> Just (reverse rs)
 660 \end{code}