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