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_WarnMissingFields,
  61         opt_WarnMissingMethods,
  62         opt_WarnMissingSigs,
  63         opt_WarnNameShadowing,
  64         opt_WarnOverlappingPatterns,
  65         opt_WarnSimplePatterns,
  66         opt_WarnTypeDefaults,
  67         opt_WarnUnusedBinds,
  68         opt_WarnUnusedImports,
  69         opt_WarnUnusedMatches,
  70
  71         -- profiling opts
  72         opt_AutoSccsOnAllToplevs,
  73         opt_AutoSccsOnExportedToplevs,
  74         opt_AutoSccsOnIndividualCafs,
  75         opt_AutoSccsOnDicts,
  76         opt_SccGroup,
  77         opt_SccProfilingOn,
  78         opt_DoTickyProfiling,
  79
  80         -- language opts
  81         opt_AllStrict,
  82         opt_DictsStrict,
  83         opt_MaxContextReductionDepth,
  84         opt_AllowOverlappingInstances,
  85         opt_AllowUndecidableInstances,
  86         opt_GlasgowExts,
  87         opt_IrrefutableTuples,
  88         opt_NumbersStrict,
  89         opt_Parallel,
  90         opt_SMP,
  91
  92         -- optimisation opts
  93         opt_DoEtaReduction,
  94         opt_DoSemiTagging,
  95         opt_FoldrBuildOn,
  96         opt_LiberateCaseThreshold,
  97         opt_StgDoLetNoEscapes,
  98         opt_UnfoldCasms,
  99         opt_UsageSPOn,
 100         opt_UnboxStrictFields,
 101         opt_SimplNoPreInlining,
 102         opt_SimplDoEtaReduction,
 103         opt_SimplDoLambdaEtaExpansion,
 104         opt_SimplCaseOfCase,
 105         opt_SimplCaseMerge,
 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_HiMapSep,
 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   | DontApplyRules
 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_simpl_stats          = opt_D_dump_most || lookUp  SLIT("-ddump-simpl-stats")
 334 opt_D_source_stats              = opt_D_dump_most || lookUp  SLIT("-dsource-stats")
 335 opt_D_verbose_core2core         = opt_D_dump_all  || lookUp  SLIT("-dverbose-simpl")
 336 opt_D_verbose_stg2stg           = opt_D_dump_all  || lookUp  SLIT("-dverbose-stg")
 337
 338 opt_DoCoreLinting               = lookUp  SLIT("-dcore-lint")
 339 opt_DoStgLinting                = lookUp  SLIT("-dstg-lint")
 340 opt_DoUSPLinting                = lookUp  SLIT("-dusagesp-lint")
 341 opt_PprStyle_NoPrags            = lookUp  SLIT("-dppr-noprags")
 342 opt_PprStyle_Debug              = lookUp  SLIT("-dppr-debug")
 343 opt_PprUserLength               = lookup_def_int "-dppr-user-length" 5 --ToDo: give this a name
 344
 345 -- warning opts
 346 opt_WarnDuplicateExports        = lookUp  SLIT("-fwarn-duplicate-exports")
 347 opt_WarnHiShadows               = lookUp  SLIT("-fwarn-hi-shadowing")
 348 opt_WarnIncompletePatterns      = lookUp  SLIT("-fwarn-incomplete-patterns")
 349 opt_WarnMissingFields           = lookUp  SLIT("-fwarn-missing-fields")
 350 opt_WarnMissingMethods          = lookUp  SLIT("-fwarn-missing-methods")
 351 opt_WarnMissingSigs             = lookUp  SLIT("-fwarn-missing-signatures")
 352 opt_WarnNameShadowing           = lookUp  SLIT("-fwarn-name-shadowing")
 353 opt_WarnOverlappingPatterns     = lookUp  SLIT("-fwarn-overlapping-patterns")
 354 opt_WarnSimplePatterns          = lookUp  SLIT("-fwarn-simple-patterns")
 355 opt_WarnTypeDefaults            = lookUp  SLIT("-fwarn-type-defaults")
 356 opt_WarnUnusedBinds             = lookUp  SLIT("-fwarn-unused-binds")
 357 opt_WarnUnusedImports           = lookUp  SLIT("-fwarn-unused-imports")
 358 opt_WarnUnusedMatches           = lookUp  SLIT("-fwarn-unused-matches")
 359
 360 -- profiling opts
 361 opt_AutoSccsOnAllToplevs        = lookUp  SLIT("-fauto-sccs-on-all-toplevs")
 362 opt_AutoSccsOnExportedToplevs   = lookUp  SLIT("-fauto-sccs-on-exported-toplevs")
 363 opt_AutoSccsOnIndividualCafs    = lookUp  SLIT("-fauto-sccs-on-individual-cafs")
 364 opt_AutoSccsOnDicts             = lookUp  SLIT("-fauto-sccs-on-dicts")
 365 opt_SccGroup                    = lookup_str "-G="
 366 opt_SccProfilingOn              = lookUp  SLIT("-fscc-profiling")
 367 opt_DoTickyProfiling            = lookUp  SLIT("-fticky-ticky")
 368
 369 -- language opts
 370 opt_AllStrict                   = lookUp  SLIT("-fall-strict")
 371 opt_DictsStrict                 = lookUp  SLIT("-fdicts-strict")
 372 opt_AllowOverlappingInstances   = lookUp  SLIT("-fallow-overlapping-instances")
 373 opt_AllowUndecidableInstances   = lookUp  SLIT("-fallow-undecidable-instances")
 374 opt_GlasgowExts                 = lookUp  SLIT("-fglasgow-exts")
 375 opt_IrrefutableTuples           = lookUp  SLIT("-firrefutable-tuples")
 376 opt_MaxContextReductionDepth    = lookup_def_int "-fcontext-stack" mAX_CONTEXT_REDUCTION_DEPTH
 377 opt_NumbersStrict               = lookUp  SLIT("-fnumbers-strict")
 378 opt_Parallel                    = lookUp  SLIT("-fparallel")
 379 opt_SMP                         = lookUp  SLIT("-fsmp")
 380
 381 -- optimisation opts
 382 opt_DoEtaReduction              = lookUp  SLIT("-fdo-eta-reduction")
 383 opt_DoSemiTagging               = lookUp  SLIT("-fsemi-tagging")
 384 opt_FoldrBuildOn                = lookUp  SLIT("-ffoldr-build-on")
 385 opt_LiberateCaseThreshold       = lookup_def_int "-fliberate-case-threshold" (10::Int)
 386 opt_StgDoLetNoEscapes           = lookUp  SLIT("-flet-no-escape")
 387 opt_UnfoldCasms                 = lookUp SLIT("-funfold-casms-in-hi-file")
 388 opt_UsageSPOn                   = lookUp  SLIT("-fusagesp-on")
 389 opt_UnboxStrictFields           = lookUp  SLIT("-funbox-strict-fields")
 390
 391   {-
 392    It's a bit unfortunate to have to re-introduce this chap, but on Win32
 393    platforms we do need a way of distinguishing between the case when we're
 394    compiling a static version of the Prelude and one that's going to be
 395    put into a DLL. Why? Because the compiler's wired in modules need to
 396    be attributed as either coming from a DLL or not.
 397   -}
 398 opt_CompilingPrelude            = lookUp  SLIT("-fcompiling-prelude")
 399 opt_EmitCExternDecls            = lookUp  SLIT("-femit-extern-decls")
 400 opt_EnsureSplittableC           = lookUp  SLIT("-fglobalise-toplev-names")
 401 opt_GranMacros                  = lookUp  SLIT("-fgransim")
 402 opt_HiMap                       = lookup_str "-himap="       -- file saying where to look for .hi files
 403 opt_HiMapSep                    = lookup_def_char "-himap-sep=" ':'
 404 opt_HiVersion                   = lookup_def_int "-fhi-version=" 0 -- what version we're compiling.
 405 opt_HistorySize                 = lookup_def_int "-fhistory-size" 20
 406 opt_IgnoreAsserts               = lookUp  SLIT("-fignore-asserts")
 407 opt_IgnoreIfacePragmas          = lookUp  SLIT("-fignore-interface-pragmas")
 408 opt_NoHiCheck                   = lookUp  SLIT("-fno-hi-version-check")
 409 opt_NoImplicitPrelude           = lookUp  SLIT("-fno-implicit-prelude")
 410 opt_OmitBlackHoling             = lookUp  SLIT("-dno-black-holing")
 411 opt_OmitInterfacePragmas        = lookUp  SLIT("-fomit-interface-pragmas")
 412 opt_ProduceC                    = lookup_str "-C="
 413 opt_ProduceExportCStubs         = lookup_str "-F="
 414 opt_ProduceExportHStubs         = lookup_str "-FH="
 415 opt_ProduceHi                   = lookup_str "-hifile=" -- the one to produce this time
 416
 417 -- Simplifier switches
 418 opt_SimplNoPreInlining          = lookUp SLIT("-fno-pre-inlining")
 419         -- NoPreInlining is there just to see how bad things
 420         -- get if you don't do it!
 421 opt_SimplDoEtaReduction         = lookUp SLIT("-fdo-eta-reduction")
 422 opt_SimplDoLambdaEtaExpansion   = lookUp SLIT("-fdo-lambda-eta-expansion")
 423 opt_SimplCaseOfCase             = lookUp SLIT("-fcase-of-case")
 424 opt_SimplCaseMerge              = lookUp SLIT("-fcase-merge")
 425 opt_SimplPedanticBottoms        = lookUp SLIT("-fpedantic-bottoms")
 426
 427 -- Unfolding control
 428 opt_UF_HiFileThreshold          = lookup_def_int "-funfolding-interface-threshold" (30::Int)
 429 opt_UF_CreationThreshold        = lookup_def_int "-funfolding-creation-threshold"  (30::Int)
 430 opt_UF_UseThreshold             = lookup_def_int "-funfolding-use-threshold"       (8::Int)     -- Discounts can be big
 431 opt_UF_ScrutConDiscount         = lookup_def_int "-funfolding-con-discount"        (2::Int)
 432 opt_UF_FunAppDiscount           = lookup_def_int "-funfolding-fun-discount"        (6::Int)     -- It's great to inline a fn
 433 opt_UF_PrimArgDiscount          = lookup_def_int "-funfolding-prim-discount"       (1::Int)
 434 opt_UF_KeenessFactor            = lookup_def_float "-funfolding-keeness-factor"    (2.0::Float)
 435
 436 opt_UF_CheapOp  = ( 0 :: Int)   -- Only one instruction; and the args are charged for
 437 opt_UF_DearOp   = ( 4 :: Int)
 438 opt_UF_NoRepLit = ( 20 :: Int)  -- Strings can be pretty big
 439
 440 opt_ProduceS                    = lookup_str "-S="
 441 opt_ReportCompile               = lookUp SLIT("-freport-compile")
 442 opt_NoPruneDecls                = lookUp SLIT("-fno-prune-decls")
 443 opt_SourceUnchanged             = lookUp SLIT("-fsource-unchanged")
 444 opt_Static                      = lookUp SLIT("-static")
 445 opt_Unregisterised              = lookUp SLIT("-funregisterised")
 446 opt_Verbose                     = lookUp SLIT("-v")
 447
 448 opt_UseVanillaRegs | opt_Unregisterised = 0
 449                    | otherwise          = mAX_Real_Vanilla_REG
 450 opt_UseFloatRegs   | opt_Unregisterised = 0
 451                    | otherwise          = mAX_Real_Float_REG
 452 opt_UseDoubleRegs  | opt_Unregisterised = 0
 453                    | otherwise          = mAX_Real_Double_REG
 454 opt_UseLongRegs    | opt_Unregisterised = 0
 455                    | otherwise          = mAX_Real_Long_REG
 456 \end{code}
 457
 458 \begin{code}
 459 classifyOpts :: ([CoreToDo],    -- Core-to-Core processing spec
 460                  [StgToDo])     -- STG-to-STG   processing spec
 461
 462 classifyOpts = sep argv [] [] -- accumulators...
 463   where
 464     sep :: [FAST_STRING]                 -- cmd-line opts (input)
 465         -> [CoreToDo] -> [StgToDo]       -- to_do accumulators
 466         -> ([CoreToDo], [StgToDo])       -- result
 467
 468     sep [] core_td stg_td -- all done!
 469       = (reverse core_td, reverse stg_td)
 470
 471 #       define CORE_TD(to_do) sep opts (to_do:core_td) stg_td
 472 #       define STG_TD(to_do)  sep opts core_td (to_do:stg_td)
 473
 474     sep (opt1:opts) core_td stg_td
 475       = case (_UNPK_ opt1) of -- the non-"just match a string" options are at the end...
 476           ',' : _       -> sep opts core_td stg_td -- it is for the parser
 477
 478           "-fsimplify"  -> -- gather up SimplifierSwitches specially...
 479                            simpl_sep opts defaultSimplSwitches core_td stg_td
 480
 481           "-ffloat-inwards"  -> CORE_TD(CoreDoFloatInwards)
 482           "-ffull-laziness"  -> CORE_TD(CoreDoFullLaziness)
 483           "-fliberate-case"  -> CORE_TD(CoreLiberateCase)
 484           "-fcse"            -> CORE_TD(CoreCSE)
 485           "-fprint-core"     -> CORE_TD(CoreDoPrintCore)
 486           "-fstatic-args"    -> CORE_TD(CoreDoStaticArgs)
 487           "-fstrictness"     -> CORE_TD(CoreDoStrictness)
 488           "-fworker-wrapper" -> CORE_TD(CoreDoWorkerWrapper)
 489           "-fspecialise"     -> CORE_TD(CoreDoSpecialising)
 490           "-fusagesp"        -> CORE_TD(CoreDoUSPInf)
 491           "-fcpr-analyse"    -> CORE_TD(CoreDoCPResult)
 492
 493           "-fstg-static-args" -> STG_TD(StgDoStaticArgs)
 494           "-fupdate-analysis" -> STG_TD(StgDoUpdateAnalysis)
 495           "-dstg-stats"       -> STG_TD(D_stg_stats)
 496           "-flambda-lift"     -> STG_TD(StgDoLambdaLift)
 497           "-fmassage-stg-for-profiling" -> STG_TD(StgDoMassageForProfiling)
 498
 499           _ -> -- NB: the driver is really supposed to handle bad options
 500                sep opts core_td stg_td
 501
 502     ----------------
 503
 504     simpl_sep :: [FAST_STRING]            -- cmd-line opts (input)
 505               -> [SimplifierSwitch]       -- simplifier-switch accumulator
 506               -> [CoreToDo] -> [StgToDo]  -- to_do accumulators
 507               -> ([CoreToDo], [StgToDo])  -- result
 508
 509         -- "simpl_sep" tailcalls "sep" once it's seen one set
 510         -- of SimplifierSwitches for a CoreDoSimplify.
 511
 512 #ifdef DEBUG
 513     simpl_sep input@[] simpl_sw core_td stg_td
 514       = panic "simpl_sep []"
 515 #endif
 516
 517         -- The SimplifierSwitches should be delimited by "[" and "]".
 518
 519     simpl_sep (opt1:opts) simpl_sw core_td stg_td
 520       = case (_UNPK_ opt1) of
 521           "[" -> simpl_sep opts simpl_sw core_td stg_td
 522           "]" -> let
 523                     this_simpl = CoreDoSimplify (isAmongSimpl simpl_sw)
 524                  in
 525                  sep opts (this_simpl : core_td) stg_td
 526
 527           opt -> case matchSimplSw opt of
 528                         Just sw -> simpl_sep opts (sw:simpl_sw) core_td stg_td
 529                         Nothing -> simpl_sep opts simpl_sw      core_td stg_td
 530
 531 matchSimplSw opt
 532   = firstJust   [ matchSwInt  opt "-fmax-simplifier-iterations"         MaxSimplifierIterations
 533                 , matchSwInt  opt "-finline-phase"                      SimplInlinePhase
 534                 , matchSwBool opt "-fno-rules"                          DontApplyRules
 535                 , matchSwBool opt "-flet-to-case"                       SimplLetToCase
 536                 ]
 537
 538 matchSwBool :: String -> String -> a -> Maybe a
 539 matchSwBool opt str sw | opt == str = Just sw
 540                        | otherwise  = Nothing
 541
 542 matchSwInt :: String -> String -> (Int -> a) -> Maybe a
 543 matchSwInt opt str sw = case startsWith str opt of
 544                             Just opt_left -> Just (sw (read opt_left))
 545                             Nothing       -> Nothing
 546 \end{code}
 547
 548 %************************************************************************
 549 %*                                                                      *
 550 \subsection{Switch ordering}
 551 %*                                                                      *
 552 %************************************************************************
 553
 554 In spite of the @Produce*@ and @SccGroup@ constructors, these things
 555 behave just like enumeration types.
 556
 557 \begin{code}
 558 instance Eq SimplifierSwitch where
 559     a == b = tagOf_SimplSwitch a _EQ_ tagOf_SimplSwitch b
 560
 561 instance Ord SimplifierSwitch where
 562     a <  b  = tagOf_SimplSwitch a _LT_ tagOf_SimplSwitch b
 563     a <= b  = tagOf_SimplSwitch a _LE_ tagOf_SimplSwitch b
 564
 565
 566 tagOf_SimplSwitch (SimplInlinePhase _)          = ILIT(1)
 567 tagOf_SimplSwitch (MaxSimplifierIterations _)   = ILIT(2)
 568 tagOf_SimplSwitch DontApplyRules                = ILIT(3)
 569 tagOf_SimplSwitch SimplLetToCase                = ILIT(4)
 570
 571 -- If you add anything here, be sure to change lAST_SIMPL_SWITCH_TAG, too!
 572
 573 lAST_SIMPL_SWITCH_TAG = 4
 574 \end{code}
 575
 576 %************************************************************************
 577 %*                                                                      *
 578 \subsection{Switch lookup}
 579 %*                                                                      *
 580 %************************************************************************
 581
 582 \begin{code}
 583 isAmongSimpl :: [SimplifierSwitch] -> SimplifierSwitch -> SwitchResult
 584
 585 isAmongSimpl on_switches                -- Switches mentioned later occur *earlier*
 586                                         -- in the list; defaults right at the end.
 587   = let
 588         tidied_on_switches = foldl rm_dups [] on_switches
 589                 -- The fold*l* ensures that we keep the latest switches;
 590                 -- ie the ones that occur earliest in the list.
 591
 592         sw_tbl :: Array Int SwitchResult
 593         sw_tbl = (array (0, lAST_SIMPL_SWITCH_TAG) -- bounds...
 594                         all_undefined)
 595                  // defined_elems
 596
 597         all_undefined = [ (i, SwBool False) | i <- [0 .. lAST_SIMPL_SWITCH_TAG ] ]
 598
 599         defined_elems = map mk_assoc_elem tidied_on_switches
 600     in
 601     -- (avoid some unboxing, bounds checking, and other horrible things:)
 602 #if __GLASGOW_HASKELL__ < 405
 603     case sw_tbl of { Array bounds_who_needs_'em stuff ->
 604 #else
 605     case sw_tbl of { Array _ _ stuff ->
 606 #endif
 607     \ switch ->
 608         case (indexArray# stuff (tagOf_SimplSwitch switch)) of
 609 #if __GLASGOW_HASKELL__ < 400
 610           Lift v -> v
 611 #elif __GLASGOW_HASKELL__ < 403
 612           (# _, v #) -> v
 613 #else
 614           (# v #) -> v
 615 #endif
 616     }
 617   where
 618     mk_assoc_elem k@(MaxSimplifierIterations lvl) = (IBOX(tagOf_SimplSwitch k), SwInt lvl)
 619     mk_assoc_elem k@(SimplInlinePhase n)          = (IBOX(tagOf_SimplSwitch k), SwInt n)
 620     mk_assoc_elem k                               = (IBOX(tagOf_SimplSwitch k), SwBool True) -- I'm here, Mom!
 621
 622     -- cannot have duplicates if we are going to use the array thing
 623     rm_dups switches_so_far switch
 624       = if switch `is_elem` switches_so_far
 625         then switches_so_far
 626         else switch : switches_so_far
 627       where
 628         sw `is_elem` []     = False
 629         sw `is_elem` (s:ss) = (tagOf_SimplSwitch sw) _EQ_ (tagOf_SimplSwitch s)
 630                             || sw `is_elem` ss
 631 \end{code}
 632
 633 Default settings for simplifier switches
 634
 635 \begin{code}
 636 defaultSimplSwitches = [MaxSimplifierIterations 1]
 637 \end{code}
 638
 639 %************************************************************************
 640 %*                                                                      *
 641 \subsection{Misc functions for command-line options}
 642 %*                                                                      *
 643 %************************************************************************
 644
 645
 646 \begin{code}
 647 switchIsOn :: (switch -> SwitchResult) -> switch -> Bool
 648
 649 switchIsOn lookup_fn switch
 650   = case (lookup_fn switch) of
 651       SwBool False -> False
 652       _            -> True
 653
 654 intSwitchSet :: (switch -> SwitchResult)
 655              -> (Int -> switch)
 656              -> Maybe Int
 657
 658 intSwitchSet lookup_fn switch
 659   = case (lookup_fn (switch (panic "intSwitchSet"))) of
 660       SwInt int -> Just int
 661       _         -> Nothing
 662 \end{code}
 663
 664 \begin{code}
 665 startsWith :: String -> String -> Maybe String
 666 -- startsWith pfx (pfx++rest) = Just rest
 667
 668 startsWith []     str = Just str
 669 startsWith (c:cs) (s:ss)
 670   = if c /= s then Nothing else startsWith cs ss
 671 startsWith  _     []  = Nothing
 672
 673 endsWith  :: String -> String -> Maybe String
 674 endsWith cs ss
 675   = case (startsWith (reverse cs) (reverse ss)) of
 676       Nothing -> Nothing
 677       Just rs -> Just (reverse rs)
 678 \end{code}