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_dump_stix,
  47         opt_D_dump_minimal_imports,
  48         opt_D_source_stats,
  49         opt_D_verbose_core2core,
  50         opt_D_verbose_stg2stg,
  51         opt_DoCoreLinting,
  52         opt_DoStgLinting,
  53         opt_DoUSPLinting,
  54         opt_PprStyle_Debug,
  55         opt_PprStyle_NoPrags,
  56         opt_PprUserLength,
  57
  58         -- warning opts
  59         opt_WarnDuplicateExports,
  60         opt_WarnHiShadows,
  61         opt_WarnIncompletePatterns,
  62         opt_WarnMissingFields,
  63         opt_WarnMissingMethods,
  64         opt_WarnMissingSigs,
  65         opt_WarnNameShadowing,
  66         opt_WarnOverlappingPatterns,
  67         opt_WarnSimplePatterns,
  68         opt_WarnTypeDefaults,
  69         opt_WarnUnusedBinds,
  70         opt_WarnUnusedImports,
  71         opt_WarnUnusedMatches,
  72         opt_WarnDeprecations,
  73
  74         -- profiling opts
  75         opt_AutoSccsOnAllToplevs,
  76         opt_AutoSccsOnExportedToplevs,
  77         opt_AutoSccsOnIndividualCafs,
  78         opt_AutoSccsOnDicts,
  79         opt_SccProfilingOn,
  80         opt_DoTickyProfiling,
  81
  82         -- language opts
  83         opt_AllStrict,
  84         opt_DictsStrict,
  85         opt_MaxContextReductionDepth,
  86         opt_AllowOverlappingInstances,
  87         opt_AllowUndecidableInstances,
  88         opt_GlasgowExts,
  89         opt_IrrefutableTuples,
  90         opt_NumbersStrict,
  91         opt_Parallel,
  92         opt_SMP,
  93
  94         -- optimisation opts
  95         opt_DoEtaReduction,
  96         opt_DoSemiTagging,
  97         opt_FoldrBuildOn,
  98         opt_LiberateCaseThreshold,
  99         opt_StgDoLetNoEscapes,
 100         opt_UnfoldCasms,
 101         opt_UsageSPOn,
 102         opt_UnboxStrictFields,
 103         opt_SimplNoPreInlining,
 104         opt_SimplDoEtaReduction,
 105         opt_SimplDoLambdaEtaExpansion,
 106         opt_SimplCaseOfCase,
 107         opt_SimplCaseMerge,
 108         opt_SimplPedanticBottoms,
 109
 110         -- Unfolding control
 111         opt_UF_HiFileThreshold,
 112         opt_UF_CreationThreshold,
 113         opt_UF_UseThreshold,
 114         opt_UF_ScrutConDiscount,
 115         opt_UF_FunAppDiscount,
 116         opt_UF_PrimArgDiscount,
 117         opt_UF_KeenessFactor,
 118         opt_UF_CheapOp,
 119         opt_UF_DearOp,
 120
 121         -- misc opts
 122         opt_InPackage,
 123         opt_EmitCExternDecls,
 124         opt_EnsureSplittableC,
 125         opt_GranMacros,
 126         opt_HiMap,
 127         opt_HiMapSep,
 128         opt_HiVersion,
 129         opt_HistorySize,
 130         opt_IgnoreAsserts,
 131         opt_IgnoreIfacePragmas,
 132         opt_NoHiCheck,
 133         opt_NoImplicitPrelude,
 134         opt_OmitBlackHoling,
 135         opt_OmitInterfacePragmas,
 136         opt_ProduceC,
 137         opt_ProduceExportCStubs,
 138         opt_ProduceExportHStubs,
 139         opt_ProduceHi,
 140         opt_ProduceS,
 141         opt_NoPruneDecls,
 142         opt_ReportCompile,
 143         opt_SourceUnchanged,
 144         opt_Static,
 145         opt_Unregisterised,
 146         opt_Verbose,
 147
 148         -- Code generation
 149         opt_UseVanillaRegs,
 150         opt_UseFloatRegs,
 151         opt_UseDoubleRegs,
 152         opt_UseLongRegs
 153     ) where
 154
 155 #include "HsVersions.h"
 156
 157 import Array    ( array, (//) )
 158 import GlaExts
 159 import Argv
 160 import Constants        -- Default values for some flags
 161
 162 import FastString       ( headFS )
 163 import Maybes           ( assocMaybe, firstJust, maybeToBool )
 164 import Panic            ( panic, panic# )
 165
 166 #if __GLASGOW_HASKELL__ < 301
 167 import ArrBase  ( Array(..) )
 168 #else
 169 import PrelArr  ( Array(..) )
 170 #endif
 171 \end{code}
 172
 173 A command-line {\em switch} is (generally) either on or off; e.g., the
 174 ``verbose'' (-v) switch is either on or off.
 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   | CoreDoFloatOutwards Bool    -- True <=> float lambdas to top level
 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   | StgDoLambdaLift
 226   | StgDoMassageForProfiling  -- should be (next to) last
 227   -- There's also setStgVarInfo, but its absolute "lastness"
 228   -- is so critical that it is hardwired in (no flag).
 229   | D_stg_stats
 230 \end{code}
 231
 232 \begin{code}
 233 data SimplifierSwitch
 234   = MaxSimplifierIterations Int
 235   | SimplInlinePhase Int
 236   | DontApplyRules
 237   | NoCaseOfCase
 238   | SimplLetToCase
 239 \end{code}
 240
 241 %************************************************************************
 242 %*                                                                      *
 243 \subsection{Classifying command-line options}
 244 %*                                                                      *
 245 %************************************************************************
 246
 247 \begin{code}
 248 lookUp           :: FAST_STRING -> Bool
 249 lookup_int       :: String -> Maybe Int
 250 lookup_def_int   :: String -> Int -> Int
 251 lookup_def_float :: String -> Float -> Float
 252 lookup_str       :: String -> Maybe String
 253
 254 lookUp     sw = maybeToBool (assoc_opts sw)
 255
 256 lookup_str sw = firstJust (map (startsWith sw) unpacked_opts)
 257
 258 lookup_int sw = case (lookup_str sw) of
 259                   Nothing -> Nothing
 260                   Just xx -> Just (read xx)
 261
 262 lookup_def_int sw def = case (lookup_str sw) of
 263                             Nothing -> def              -- Use default
 264                             Just xx -> read xx
 265
 266 lookup_def_char sw def = case (lookup_str sw) of
 267                             Just (xx:_) -> xx
 268                             _           -> def          -- Use default
 269
 270 lookup_def_float sw def = case (lookup_str sw) of
 271                             Nothing -> def              -- Use default
 272                             Just xx -> read xx
 273
 274 assoc_opts    = assocMaybe [ (a, True) | a <- argv ]
 275 unpacked_opts = map _UNPK_ argv
 276
 277 {-
 278  Putting the compiler options into temporary at-files
 279  may turn out to be necessary later on if we turn hsc into
 280  a pure Win32 application where I think there's a command-line
 281  length limit of 255. unpacked_opts understands the @ option.
 282
 283 assoc_opts    = assocMaybe [ (_PK_ a, True) | a <- unpacked_opts ]
 284
 285 unpacked_opts :: [String]
 286 unpacked_opts =
 287   concat $
 288   map (expandAts) $
 289   map _UNPK_ argv
 290   where
 291    expandAts ('@':fname) = words (unsafePerformIO (readFile fname))
 292    expandAts l = [l]
 293 -}
 294 \end{code}
 295
 296 \begin{code}
 297 src_filename :: FAST_STRING
 298 src_filename = case argv of
 299                   filename : rest | headFS filename /= '-' -> filename
 300                   otherwise -> panic "no filename"
 301 \end{code}
 302
 303 \begin{code}
 304 -- debugging opts
 305 opt_D_dump_all   {- do not -}   = lookUp  SLIT("-ddump-all")
 306 opt_D_dump_most  {- export -}   = opt_D_dump_all  || lookUp  SLIT("-ddump-most")
 307
 308 opt_D_dump_absC                 = opt_D_dump_all  || lookUp  SLIT("-ddump-absC")
 309 opt_D_dump_asm                  = opt_D_dump_all  || lookUp  SLIT("-ddump-asm")
 310 opt_D_dump_cpranal              = opt_D_dump_most || lookUp  SLIT("-ddump-cpranal")
 311 opt_D_dump_deriv                = opt_D_dump_most || lookUp  SLIT("-ddump-deriv")
 312 opt_D_dump_ds                   = opt_D_dump_most || lookUp  SLIT("-ddump-ds")
 313 opt_D_dump_flatC                = opt_D_dump_all  || lookUp  SLIT("-ddump-flatC")
 314 opt_D_dump_foreign              = opt_D_dump_most || lookUp  SLIT("-ddump-foreign-stubs")
 315 opt_D_dump_inlinings            = opt_D_dump_all  || lookUp  SLIT("-ddump-inlinings")
 316 opt_D_dump_occur_anal           = opt_D_dump_all  || lookUp  SLIT("-ddump-occur-anal")
 317 opt_D_dump_parsed               = opt_D_dump_most || lookUp  SLIT("-ddump-parsed")
 318 opt_D_dump_realC                = opt_D_dump_all  || lookUp  SLIT("-ddump-realC")
 319 opt_D_dump_rn                   = opt_D_dump_most || lookUp  SLIT("-ddump-rn")
 320 opt_D_dump_simpl                = opt_D_dump_most || lookUp  SLIT("-ddump-simpl")
 321 opt_D_dump_simpl_iterations     = opt_D_dump_all  || lookUp  SLIT("-ddump-simpl-iterations")
 322 opt_D_dump_spec                 = opt_D_dump_most || lookUp  SLIT("-ddump-spec")
 323 opt_D_dump_stg                  = opt_D_dump_most || lookUp  SLIT("-ddump-stg")
 324 opt_D_dump_stranal              = opt_D_dump_most || lookUp  SLIT("-ddump-stranal")
 325 opt_D_dump_tc                   = opt_D_dump_most || lookUp  SLIT("-ddump-tc")
 326 opt_D_dump_rules                = opt_D_dump_most || lookUp  SLIT("-ddump-rules")
 327 opt_D_dump_usagesp              = opt_D_dump_most || lookUp  SLIT("-ddump-usagesp")
 328 opt_D_dump_cse                  = opt_D_dump_most || lookUp  SLIT("-ddump-cse")
 329 opt_D_dump_worker_wrapper       = opt_D_dump_most || lookUp  SLIT("-ddump-workwrap")
 330 opt_D_show_passes               = opt_D_dump_most || lookUp  SLIT("-dshow-passes")
 331 opt_D_dump_rn_trace             = opt_D_dump_all  || lookUp  SLIT("-ddump-rn-trace")
 332 opt_D_dump_rn_stats             = opt_D_dump_most || lookUp  SLIT("-ddump-rn-stats")
 333 opt_D_dump_stix                 = opt_D_dump_all  || lookUp  SLIT("-ddump-stix")
 334 opt_D_dump_simpl_stats          = opt_D_dump_most || lookUp  SLIT("-ddump-simpl-stats")
 335 opt_D_source_stats              = opt_D_dump_most || lookUp  SLIT("-dsource-stats")
 336 opt_D_verbose_core2core         = opt_D_dump_all  || lookUp  SLIT("-dverbose-simpl")
 337 opt_D_verbose_stg2stg           = opt_D_dump_all  || lookUp  SLIT("-dverbose-stg")
 338 opt_D_dump_minimal_imports      = lookUp  SLIT("-ddump-minimal-imports")
 339
 340 opt_DoCoreLinting               = lookUp  SLIT("-dcore-lint")
 341 opt_DoStgLinting                = lookUp  SLIT("-dstg-lint")
 342 opt_DoUSPLinting                = lookUp  SLIT("-dusagesp-lint")
 343 opt_PprStyle_NoPrags            = lookUp  SLIT("-dppr-noprags")
 344 opt_PprStyle_Debug              = lookUp  SLIT("-dppr-debug")
 345 opt_PprUserLength               = lookup_def_int "-dppr-user-length" 5 --ToDo: give this a name
 346
 347 -- warning opts
 348 opt_WarnDuplicateExports        = lookUp  SLIT("-fwarn-duplicate-exports")
 349 opt_WarnHiShadows               = lookUp  SLIT("-fwarn-hi-shadowing")
 350 opt_WarnIncompletePatterns      = lookUp  SLIT("-fwarn-incomplete-patterns")
 351 opt_WarnMissingFields           = lookUp  SLIT("-fwarn-missing-fields")
 352 opt_WarnMissingMethods          = lookUp  SLIT("-fwarn-missing-methods")
 353 opt_WarnMissingSigs             = lookUp  SLIT("-fwarn-missing-signatures")
 354 opt_WarnNameShadowing           = lookUp  SLIT("-fwarn-name-shadowing")
 355 opt_WarnOverlappingPatterns     = lookUp  SLIT("-fwarn-overlapping-patterns")
 356 opt_WarnSimplePatterns          = lookUp  SLIT("-fwarn-simple-patterns")
 357 opt_WarnTypeDefaults            = lookUp  SLIT("-fwarn-type-defaults")
 358 opt_WarnUnusedBinds             = lookUp  SLIT("-fwarn-unused-binds")
 359 opt_WarnUnusedImports           = lookUp  SLIT("-fwarn-unused-imports")
 360 opt_WarnUnusedMatches           = lookUp  SLIT("-fwarn-unused-matches")
 361 opt_WarnDeprecations            = lookUp  SLIT("-fwarn-deprecations")
 362
 363 -- profiling opts
 364 opt_AutoSccsOnAllToplevs        = lookUp  SLIT("-fauto-sccs-on-all-toplevs")
 365 opt_AutoSccsOnExportedToplevs   = lookUp  SLIT("-fauto-sccs-on-exported-toplevs")
 366 opt_AutoSccsOnIndividualCafs    = lookUp  SLIT("-fauto-sccs-on-individual-cafs")
 367 opt_AutoSccsOnDicts             = lookUp  SLIT("-fauto-sccs-on-dicts")
 368 opt_SccProfilingOn              = lookUp  SLIT("-fscc-profiling")
 369 opt_DoTickyProfiling            = lookUp  SLIT("-fticky-ticky")
 370
 371 -- language opts
 372 opt_AllStrict                   = lookUp  SLIT("-fall-strict")
 373 opt_DictsStrict                 = lookUp  SLIT("-fdicts-strict")
 374 opt_AllowOverlappingInstances   = lookUp  SLIT("-fallow-overlapping-instances")
 375 opt_AllowUndecidableInstances   = lookUp  SLIT("-fallow-undecidable-instances")
 376 opt_GlasgowExts                 = lookUp  SLIT("-fglasgow-exts")
 377 opt_IrrefutableTuples           = lookUp  SLIT("-firrefutable-tuples")
 378 opt_MaxContextReductionDepth    = lookup_def_int "-fcontext-stack" mAX_CONTEXT_REDUCTION_DEPTH
 379 opt_NumbersStrict               = lookUp  SLIT("-fnumbers-strict")
 380 opt_Parallel                    = lookUp  SLIT("-fparallel")
 381 opt_SMP                         = lookUp  SLIT("-fsmp")
 382
 383 -- optimisation opts
 384 opt_DoEtaReduction              = lookUp  SLIT("-fdo-eta-reduction")
 385 opt_DoSemiTagging               = lookUp  SLIT("-fsemi-tagging")
 386 opt_FoldrBuildOn                = lookUp  SLIT("-ffoldr-build-on")
 387 opt_LiberateCaseThreshold       = lookup_def_int "-fliberate-case-threshold" (10::Int)
 388 opt_StgDoLetNoEscapes           = lookUp  SLIT("-flet-no-escape")
 389 opt_UnfoldCasms                 = lookUp SLIT("-funfold-casms-in-hi-file")
 390 opt_UsageSPOn                   = lookUp  SLIT("-fusagesp-on")
 391 opt_UnboxStrictFields           = lookUp  SLIT("-funbox-strict-fields")
 392
 393 {-
 394    The optional '-inpackage=P' flag tells what package
 395    we are compiling this module for.
 396    The Prelude, for example is compiled with '-package prelude'
 397 -}
 398 opt_InPackage                   = case lookup_str "-inpackage=" of
 399                                     Just p  -> _PK_ p
 400                                     Nothing -> SLIT("Main")     -- The package name if none is specified
 401
 402 opt_EmitCExternDecls            = lookUp  SLIT("-femit-extern-decls")
 403 opt_EnsureSplittableC           = lookUp  SLIT("-fglobalise-toplev-names")
 404 opt_GranMacros                  = lookUp  SLIT("-fgransim")
 405 opt_HiMap                       = lookup_str "-himap="       -- file saying where to look for .hi files
 406 opt_HiMapSep                    = lookup_def_char "-himap-sep=" ':'
 407 opt_HiVersion                   = lookup_def_int "-fhi-version=" 0 -- what version we're compiling.
 408 opt_HistorySize                 = lookup_def_int "-fhistory-size" 20
 409 opt_IgnoreAsserts               = lookUp  SLIT("-fignore-asserts")
 410 opt_IgnoreIfacePragmas          = lookUp  SLIT("-fignore-interface-pragmas")
 411 opt_NoHiCheck                   = lookUp  SLIT("-fno-hi-version-check")
 412 opt_NoImplicitPrelude           = lookUp  SLIT("-fno-implicit-prelude")
 413 opt_OmitBlackHoling             = lookUp  SLIT("-dno-black-holing")
 414 opt_OmitInterfacePragmas        = lookUp  SLIT("-fomit-interface-pragmas")
 415 opt_ProduceC                    = lookup_str "-C="
 416 opt_ProduceExportCStubs         = lookup_str "-F="
 417 opt_ProduceExportHStubs         = lookup_str "-FH="
 418 opt_ProduceHi                   = lookup_str "-hifile=" -- the one to produce this time
 419
 420 -- Simplifier switches
 421 opt_SimplNoPreInlining          = lookUp SLIT("-fno-pre-inlining")
 422         -- NoPreInlining is there just to see how bad things
 423         -- get if you don't do it!
 424 opt_SimplDoEtaReduction         = lookUp SLIT("-fdo-eta-reduction")
 425 opt_SimplDoLambdaEtaExpansion   = lookUp SLIT("-fdo-lambda-eta-expansion")
 426 opt_SimplCaseOfCase             = lookUp SLIT("-fcase-of-case")
 427 opt_SimplCaseMerge              = lookUp SLIT("-fcase-merge")
 428 opt_SimplPedanticBottoms        = lookUp SLIT("-fpedantic-bottoms")
 429
 430 -- Unfolding control
 431 opt_UF_HiFileThreshold          = lookup_def_int "-funfolding-interface-threshold" (45::Int)
 432 opt_UF_CreationThreshold        = lookup_def_int "-funfolding-creation-threshold"  (45::Int)
 433 opt_UF_UseThreshold             = lookup_def_int "-funfolding-use-threshold"       (8::Int)     -- Discounts can be big
 434 opt_UF_ScrutConDiscount         = lookup_def_int "-funfolding-con-discount"        (2::Int)
 435 opt_UF_FunAppDiscount           = lookup_def_int "-funfolding-fun-discount"        (6::Int)     -- It's great to inline a fn
 436 opt_UF_PrimArgDiscount          = lookup_def_int "-funfolding-prim-discount"       (1::Int)
 437 opt_UF_KeenessFactor            = lookup_def_float "-funfolding-keeness-factor"    (1.5::Float)
 438
 439 opt_UF_CheapOp  = ( 1 :: Int)   -- Only one instruction; and the args are charged for
 440 opt_UF_DearOp   = ( 4 :: Int)
 441
 442 opt_ProduceS                    = lookup_str "-S="
 443 opt_ReportCompile               = lookUp SLIT("-freport-compile")
 444 opt_NoPruneDecls                = lookUp SLIT("-fno-prune-decls")
 445 opt_SourceUnchanged             = lookUp SLIT("-fsource-unchanged")
 446 opt_Static                      = lookUp SLIT("-static")
 447 opt_Unregisterised              = lookUp SLIT("-funregisterised")
 448 opt_Verbose                     = lookUp SLIT("-v")
 449
 450 opt_UseVanillaRegs | opt_Unregisterised = 0
 451                    | otherwise          = mAX_Real_Vanilla_REG
 452 opt_UseFloatRegs   | opt_Unregisterised = 0
 453                    | otherwise          = mAX_Real_Float_REG
 454 opt_UseDoubleRegs  | opt_Unregisterised = 0
 455                    | otherwise          = mAX_Real_Double_REG
 456 opt_UseLongRegs    | opt_Unregisterised = 0
 457                    | otherwise          = mAX_Real_Long_REG
 458 \end{code}
 459
 460 \begin{code}
 461 classifyOpts :: ([CoreToDo],    -- Core-to-Core processing spec
 462                  [StgToDo])     -- STG-to-STG   processing spec
 463
 464 classifyOpts = sep argv [] [] -- accumulators...
 465   where
 466     sep :: [FAST_STRING]                 -- cmd-line opts (input)
 467         -> [CoreToDo] -> [StgToDo]       -- to_do accumulators
 468         -> ([CoreToDo], [StgToDo])       -- result
 469
 470     sep [] core_td stg_td -- all done!
 471       = (reverse core_td, reverse stg_td)
 472
 473 #       define CORE_TD(to_do) sep opts (to_do:core_td) stg_td
 474 #       define STG_TD(to_do)  sep opts core_td (to_do:stg_td)
 475
 476     sep (opt1:opts) core_td stg_td
 477       = case (_UNPK_ opt1) of -- the non-"just match a string" options are at the end...
 478           ',' : _       -> sep opts core_td stg_td -- it is for the parser
 479
 480           "-fsimplify"  -> -- gather up SimplifierSwitches specially...
 481                            simpl_sep opts defaultSimplSwitches core_td stg_td
 482
 483           "-ffloat-inwards"  -> CORE_TD(CoreDoFloatInwards)
 484           "-ffloat-outwards"      -> CORE_TD(CoreDoFloatOutwards False)
 485           "-ffloat-outwards-full" -> CORE_TD(CoreDoFloatOutwards True)
 486           "-fliberate-case"  -> CORE_TD(CoreLiberateCase)
 487           "-fcse"            -> CORE_TD(CoreCSE)
 488           "-fprint-core"     -> CORE_TD(CoreDoPrintCore)
 489           "-fstatic-args"    -> CORE_TD(CoreDoStaticArgs)
 490           "-fstrictness"     -> CORE_TD(CoreDoStrictness)
 491           "-fworker-wrapper" -> CORE_TD(CoreDoWorkerWrapper)
 492           "-fspecialise"     -> CORE_TD(CoreDoSpecialising)
 493           "-fusagesp"        -> CORE_TD(CoreDoUSPInf)
 494           "-fcpr-analyse"    -> CORE_TD(CoreDoCPResult)
 495
 496           "-fstg-static-args" -> STG_TD(StgDoStaticArgs)
 497           "-dstg-stats"       -> STG_TD(D_stg_stats)
 498           "-flambda-lift"     -> STG_TD(StgDoLambdaLift)
 499           "-fmassage-stg-for-profiling" -> STG_TD(StgDoMassageForProfiling)
 500
 501           _ -> -- NB: the driver is really supposed to handle bad options
 502                sep opts core_td stg_td
 503
 504     ----------------
 505
 506     simpl_sep :: [FAST_STRING]            -- cmd-line opts (input)
 507               -> [SimplifierSwitch]       -- simplifier-switch accumulator
 508               -> [CoreToDo] -> [StgToDo]  -- to_do accumulators
 509               -> ([CoreToDo], [StgToDo])  -- result
 510
 511         -- "simpl_sep" tailcalls "sep" once it's seen one set
 512         -- of SimplifierSwitches for a CoreDoSimplify.
 513
 514 #ifdef DEBUG
 515     simpl_sep input@[] simpl_sw core_td stg_td
 516       = panic "simpl_sep []"
 517 #endif
 518
 519         -- The SimplifierSwitches should be delimited by "[" and "]".
 520
 521     simpl_sep (opt1:opts) simpl_sw core_td stg_td
 522       = case (_UNPK_ opt1) of
 523           "[" -> simpl_sep opts simpl_sw core_td stg_td
 524           "]" -> let
 525                     this_simpl = CoreDoSimplify (isAmongSimpl simpl_sw)
 526                  in
 527                  sep opts (this_simpl : core_td) stg_td
 528
 529           opt -> case matchSimplSw opt of
 530                         Just sw -> simpl_sep opts (sw:simpl_sw) core_td stg_td
 531                         Nothing -> simpl_sep opts simpl_sw      core_td stg_td
 532
 533 matchSimplSw opt
 534   = firstJust   [ matchSwInt  opt "-fmax-simplifier-iterations"         MaxSimplifierIterations
 535                 , matchSwInt  opt "-finline-phase"                      SimplInlinePhase
 536                 , matchSwBool opt "-fno-rules"                          DontApplyRules
 537                 , matchSwBool opt "-fno-case-of-case"                   NoCaseOfCase
 538                 , matchSwBool opt "-flet-to-case"                       SimplLetToCase
 539                 ]
 540
 541 matchSwBool :: String -> String -> a -> Maybe a
 542 matchSwBool opt str sw | opt == str = Just sw
 543                        | otherwise  = Nothing
 544
 545 matchSwInt :: String -> String -> (Int -> a) -> Maybe a
 546 matchSwInt opt str sw = case startsWith str opt of
 547                             Just opt_left -> Just (sw (read opt_left))
 548                             Nothing       -> Nothing
 549 \end{code}
 550
 551 %************************************************************************
 552 %*                                                                      *
 553 \subsection{Switch ordering}
 554 %*                                                                      *
 555 %************************************************************************
 556
 557 In spite of the @Produce*@ constructor, these things behave just like
 558 enumeration types.
 559
 560 \begin{code}
 561 instance Eq SimplifierSwitch where
 562     a == b = tagOf_SimplSwitch a _EQ_ tagOf_SimplSwitch b
 563
 564 instance Ord SimplifierSwitch where
 565     a <  b  = tagOf_SimplSwitch a _LT_ tagOf_SimplSwitch b
 566     a <= b  = tagOf_SimplSwitch a _LE_ tagOf_SimplSwitch b
 567
 568
 569 tagOf_SimplSwitch (SimplInlinePhase _)          = ILIT(1)
 570 tagOf_SimplSwitch (MaxSimplifierIterations _)   = ILIT(2)
 571 tagOf_SimplSwitch DontApplyRules                = ILIT(3)
 572 tagOf_SimplSwitch SimplLetToCase                = ILIT(4)
 573 tagOf_SimplSwitch NoCaseOfCase                  = ILIT(5)
 574
 575 -- If you add anything here, be sure to change lAST_SIMPL_SWITCH_TAG, too!
 576
 577 lAST_SIMPL_SWITCH_TAG = 5
 578 \end{code}
 579
 580 %************************************************************************
 581 %*                                                                      *
 582 \subsection{Switch lookup}
 583 %*                                                                      *
 584 %************************************************************************
 585
 586 \begin{code}
 587 isAmongSimpl :: [SimplifierSwitch] -> SimplifierSwitch -> SwitchResult
 588
 589 isAmongSimpl on_switches                -- Switches mentioned later occur *earlier*
 590                                         -- in the list; defaults right at the end.
 591   = let
 592         tidied_on_switches = foldl rm_dups [] on_switches
 593                 -- The fold*l* ensures that we keep the latest switches;
 594                 -- ie the ones that occur earliest in the list.
 595
 596         sw_tbl :: Array Int SwitchResult
 597         sw_tbl = (array (0, lAST_SIMPL_SWITCH_TAG) -- bounds...
 598                         all_undefined)
 599                  // defined_elems
 600
 601         all_undefined = [ (i, SwBool False) | i <- [0 .. lAST_SIMPL_SWITCH_TAG ] ]
 602
 603         defined_elems = map mk_assoc_elem tidied_on_switches
 604     in
 605     -- (avoid some unboxing, bounds checking, and other horrible things:)
 606 #if __GLASGOW_HASKELL__ < 405
 607     case sw_tbl of { Array bounds_who_needs_'em stuff ->
 608 #else
 609     case sw_tbl of { Array _ _ stuff ->
 610 #endif
 611     \ switch ->
 612         case (indexArray# stuff (tagOf_SimplSwitch switch)) of
 613 #if __GLASGOW_HASKELL__ < 400
 614           Lift v -> v
 615 #elif __GLASGOW_HASKELL__ < 403
 616           (# _, v #) -> v
 617 #else
 618           (# v #) -> v
 619 #endif
 620     }
 621   where
 622     mk_assoc_elem k@(MaxSimplifierIterations lvl) = (IBOX(tagOf_SimplSwitch k), SwInt lvl)
 623     mk_assoc_elem k@(SimplInlinePhase n)          = (IBOX(tagOf_SimplSwitch k), SwInt n)
 624     mk_assoc_elem k                               = (IBOX(tagOf_SimplSwitch k), SwBool True) -- I'm here, Mom!
 625
 626     -- cannot have duplicates if we are going to use the array thing
 627     rm_dups switches_so_far switch
 628       = if switch `is_elem` switches_so_far
 629         then switches_so_far
 630         else switch : switches_so_far
 631       where
 632         sw `is_elem` []     = False
 633         sw `is_elem` (s:ss) = (tagOf_SimplSwitch sw) _EQ_ (tagOf_SimplSwitch s)
 634                             || sw `is_elem` ss
 635 \end{code}
 636
 637 Default settings for simplifier switches
 638
 639 \begin{code}
 640 defaultSimplSwitches = [MaxSimplifierIterations 1]
 641 \end{code}
 642
 643 %************************************************************************
 644 %*                                                                      *
 645 \subsection{Misc functions for command-line options}
 646 %*                                                                      *
 647 %************************************************************************
 648
 649
 650 \begin{code}
 651 switchIsOn :: (switch -> SwitchResult) -> switch -> Bool
 652
 653 switchIsOn lookup_fn switch
 654   = case (lookup_fn switch) of
 655       SwBool False -> False
 656       _            -> True
 657
 658 intSwitchSet :: (switch -> SwitchResult)
 659              -> (Int -> switch)
 660              -> Maybe Int
 661
 662 intSwitchSet lookup_fn switch
 663   = case (lookup_fn (switch (panic "intSwitchSet"))) of
 664       SwInt int -> Just int
 665       _         -> Nothing
 666 \end{code}
 667
 668 \begin{code}
 669 startsWith :: String -> String -> Maybe String
 670 -- startsWith pfx (pfx++rest) = Just rest
 671
 672 startsWith []     str = Just str
 673 startsWith (c:cs) (s:ss)
 674   = if c /= s then Nothing else startsWith cs ss
 675 startsWith  _     []  = Nothing
 676
 677 endsWith  :: String -> String -> Maybe String
 678 endsWith cs ss
 679   = case (startsWith (reverse cs) (reverse ss)) of
 680       Nothing -> Nothing
 681       Just rs -> Just (reverse rs)
 682 \end{code}