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_source_stats,
  48         opt_D_verbose_core2core,
  49         opt_D_verbose_stg2stg,
  50         opt_DoCoreLinting,
  51         opt_DoStgLinting,
  52         opt_DoUSPLinting,
  53         opt_PprStyle_Debug,
  54         opt_PprStyle_NoPrags,
  55         opt_PprUserLength,
  56
  57         -- warning opts
  58         opt_WarnDuplicateExports,
  59         opt_WarnHiShadows,
  60         opt_WarnIncompletePatterns,
  61         opt_WarnMissingFields,
  62         opt_WarnMissingMethods,
  63         opt_WarnMissingSigs,
  64         opt_WarnNameShadowing,
  65         opt_WarnOverlappingPatterns,
  66         opt_WarnSimplePatterns,
  67         opt_WarnTypeDefaults,
  68         opt_WarnUnusedBinds,
  69         opt_WarnUnusedImports,
  70         opt_WarnUnusedMatches,
  71         opt_WarnDeprecations,
  72
  73         -- profiling opts
  74         opt_AutoSccsOnAllToplevs,
  75         opt_AutoSccsOnExportedToplevs,
  76         opt_AutoSccsOnIndividualCafs,
  77         opt_AutoSccsOnDicts,
  78         opt_SccProfilingOn,
  79         opt_DoTickyProfiling,
  80
  81         -- language opts
  82         opt_AllStrict,
  83         opt_DictsStrict,
  84         opt_MaxContextReductionDepth,
  85         opt_AllowOverlappingInstances,
  86         opt_AllowUndecidableInstances,
  87         opt_GlasgowExts,
  88         opt_IrrefutableTuples,
  89         opt_NumbersStrict,
  90         opt_Parallel,
  91         opt_SMP,
  92
  93         -- optimisation opts
  94         opt_DoEtaReduction,
  95         opt_DoSemiTagging,
  96         opt_FoldrBuildOn,
  97         opt_LiberateCaseThreshold,
  98         opt_StgDoLetNoEscapes,
  99         opt_UnfoldCasms,
 100         opt_UsageSPOn,
 101         opt_UnboxStrictFields,
 102         opt_SimplNoPreInlining,
 103         opt_SimplDoEtaReduction,
 104         opt_SimplDoLambdaEtaExpansion,
 105         opt_SimplCaseOfCase,
 106         opt_SimplCaseMerge,
 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
 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.
 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   | CoreDoFloatOutwards Bool    -- True <=> float lambdas to top level
 210   | CoreLiberateCase
 211   | CoreDoPrintCore
 212   | CoreDoStaticArgs
 213   | CoreDoStrictness
 214   | CoreDoWorkerWrapper
 215   | CoreDoSpecialising
 216   | CoreDoUSPInf
 217   | CoreDoCPResult
 218   | CoreCSE
 219 \end{code}
 220
 221 \begin{code}
 222 data StgToDo
 223   = StgDoStaticArgs
 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   | DontApplyRules
 236   | NoCaseOfCase
 237   | SimplLetToCase
 238 \end{code}
 239
 240 %************************************************************************
 241 %*                                                                      *
 242 \subsection{Classifying command-line options}
 243 %*                                                                      *
 244 %************************************************************************
 245
 246 \begin{code}
 247 lookUp           :: FAST_STRING -> Bool
 248 lookup_int       :: String -> Maybe Int
 249 lookup_def_int   :: String -> Int -> Int
 250 lookup_def_float :: String -> Float -> Float
 251 lookup_str       :: String -> Maybe String
 252
 253 lookUp     sw = maybeToBool (assoc_opts sw)
 254
 255 lookup_str sw = firstJust (map (startsWith sw) unpacked_opts)
 256
 257 lookup_int sw = case (lookup_str sw) of
 258                   Nothing -> Nothing
 259                   Just xx -> Just (read xx)
 260
 261 lookup_def_int sw def = case (lookup_str sw) of
 262                             Nothing -> def              -- Use default
 263                             Just xx -> read xx
 264
 265 lookup_def_char sw def = case (lookup_str sw) of
 266                             Just (xx:_) -> xx
 267                             _           -> def          -- Use default
 268
 269 lookup_def_float sw def = case (lookup_str sw) of
 270                             Nothing -> def              -- Use default
 271                             Just xx -> read xx
 272
 273 assoc_opts    = assocMaybe [ (a, True) | a <- argv ]
 274 unpacked_opts = map _UNPK_ argv
 275
 276 {-
 277  Putting the compiler options into temporary at-files
 278  may turn out to be necessary later on if we turn hsc into
 279  a pure Win32 application where I think there's a command-line
 280  length limit of 255. unpacked_opts understands the @ option.
 281
 282 assoc_opts    = assocMaybe [ (_PK_ a, True) | a <- unpacked_opts ]
 283
 284 unpacked_opts :: [String]
 285 unpacked_opts =
 286   concat $
 287   map (expandAts) $
 288   map _UNPK_ argv
 289   where
 290    expandAts ('@':fname) = words (unsafePerformIO (readFile fname))
 291    expandAts l = [l]
 292 -}
 293 \end{code}
 294
 295 \begin{code}
 296 src_filename :: FAST_STRING
 297 src_filename = case argv of
 298                   filename : rest | headFS filename /= '-' -> filename
 299                   otherwise -> panic "no filename"
 300 \end{code}
 301
 302 \begin{code}
 303 -- debugging opts
 304 opt_D_dump_all   {- do not -}   = lookUp  SLIT("-ddump-all")
 305 opt_D_dump_most  {- export -}   = opt_D_dump_all  || lookUp  SLIT("-ddump-most")
 306
 307 opt_D_dump_absC                 = opt_D_dump_all  || lookUp  SLIT("-ddump-absC")
 308 opt_D_dump_asm                  = opt_D_dump_all  || lookUp  SLIT("-ddump-asm")
 309 opt_D_dump_cpranal              = opt_D_dump_most || lookUp  SLIT("-ddump-cpranal")
 310 opt_D_dump_deriv                = opt_D_dump_most || lookUp  SLIT("-ddump-deriv")
 311 opt_D_dump_ds                   = opt_D_dump_most || lookUp  SLIT("-ddump-ds")
 312 opt_D_dump_flatC                = opt_D_dump_all  || lookUp  SLIT("-ddump-flatC")
 313 opt_D_dump_foreign              = opt_D_dump_most || lookUp  SLIT("-ddump-foreign-stubs")
 314 opt_D_dump_inlinings            = opt_D_dump_all  || lookUp  SLIT("-ddump-inlinings")
 315 opt_D_dump_occur_anal           = opt_D_dump_all  || lookUp  SLIT("-ddump-occur-anal")
 316 opt_D_dump_parsed               = opt_D_dump_most || lookUp  SLIT("-ddump-parsed")
 317 opt_D_dump_realC                = opt_D_dump_all  || lookUp  SLIT("-ddump-realC")
 318 opt_D_dump_rn                   = opt_D_dump_most || lookUp  SLIT("-ddump-rn")
 319 opt_D_dump_simpl                = opt_D_dump_most || lookUp  SLIT("-ddump-simpl")
 320 opt_D_dump_simpl_iterations     = opt_D_dump_all  || lookUp  SLIT("-ddump-simpl-iterations")
 321 opt_D_dump_spec                 = opt_D_dump_most || lookUp  SLIT("-ddump-spec")
 322 opt_D_dump_stg                  = opt_D_dump_most || lookUp  SLIT("-ddump-stg")
 323 opt_D_dump_stranal              = opt_D_dump_most || lookUp  SLIT("-ddump-stranal")
 324 opt_D_dump_tc                   = opt_D_dump_most || lookUp  SLIT("-ddump-tc")
 325 opt_D_dump_rules                = opt_D_dump_most || lookUp  SLIT("-ddump-rules")
 326 opt_D_dump_usagesp              = opt_D_dump_most || lookUp  SLIT("-ddump-usagesp")
 327 opt_D_dump_cse                  = opt_D_dump_most || lookUp  SLIT("-ddump-cse")
 328 opt_D_dump_worker_wrapper       = opt_D_dump_most || lookUp  SLIT("-ddump-workwrap")
 329 opt_D_show_passes               = opt_D_dump_most || lookUp  SLIT("-dshow-passes")
 330 opt_D_dump_rn_trace             = opt_D_dump_all  || lookUp  SLIT("-ddump-rn-trace")
 331 opt_D_dump_rn_stats             = opt_D_dump_most || lookUp  SLIT("-ddump-rn-stats")
 332 opt_D_dump_stix                 = opt_D_dump_all  || lookUp  SLIT("-ddump-stix")
 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 opt_WarnDeprecations            = lookUp  SLIT("-fwarn-deprecations")
 360
 361 -- profiling opts
 362 opt_AutoSccsOnAllToplevs        = lookUp  SLIT("-fauto-sccs-on-all-toplevs")
 363 opt_AutoSccsOnExportedToplevs   = lookUp  SLIT("-fauto-sccs-on-exported-toplevs")
 364 opt_AutoSccsOnIndividualCafs    = lookUp  SLIT("-fauto-sccs-on-individual-cafs")
 365 opt_AutoSccsOnDicts             = lookUp  SLIT("-fauto-sccs-on-dicts")
 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" (45::Int)
 429 opt_UF_CreationThreshold        = lookup_def_int "-funfolding-creation-threshold"  (45::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"    (1.5::Float)
 435
 436 opt_UF_CheapOp  = ( 1 :: Int)   -- Only one instruction; and the args are charged for
 437 opt_UF_DearOp   = ( 4 :: Int)
 438
 439 opt_ProduceS                    = lookup_str "-S="
 440 opt_ReportCompile               = lookUp SLIT("-freport-compile")
 441 opt_NoPruneDecls                = lookUp SLIT("-fno-prune-decls")
 442 opt_SourceUnchanged             = lookUp SLIT("-fsource-unchanged")
 443 opt_Static                      = lookUp SLIT("-static")
 444 opt_Unregisterised              = lookUp SLIT("-funregisterised")
 445 opt_Verbose                     = lookUp SLIT("-v")
 446
 447 opt_UseVanillaRegs | opt_Unregisterised = 0
 448                    | otherwise          = mAX_Real_Vanilla_REG
 449 opt_UseFloatRegs   | opt_Unregisterised = 0
 450                    | otherwise          = mAX_Real_Float_REG
 451 opt_UseDoubleRegs  | opt_Unregisterised = 0
 452                    | otherwise          = mAX_Real_Double_REG
 453 opt_UseLongRegs    | opt_Unregisterised = 0
 454                    | otherwise          = mAX_Real_Long_REG
 455 \end{code}
 456
 457 \begin{code}
 458 classifyOpts :: ([CoreToDo],    -- Core-to-Core processing spec
 459                  [StgToDo])     -- STG-to-STG   processing spec
 460
 461 classifyOpts = sep argv [] [] -- accumulators...
 462   where
 463     sep :: [FAST_STRING]                 -- cmd-line opts (input)
 464         -> [CoreToDo] -> [StgToDo]       -- to_do accumulators
 465         -> ([CoreToDo], [StgToDo])       -- result
 466
 467     sep [] core_td stg_td -- all done!
 468       = (reverse core_td, reverse stg_td)
 469
 470 #       define CORE_TD(to_do) sep opts (to_do:core_td) stg_td
 471 #       define STG_TD(to_do)  sep opts core_td (to_do:stg_td)
 472
 473     sep (opt1:opts) core_td stg_td
 474       = case (_UNPK_ opt1) of -- the non-"just match a string" options are at the end...
 475           ',' : _       -> sep opts core_td stg_td -- it is for the parser
 476
 477           "-fsimplify"  -> -- gather up SimplifierSwitches specially...
 478                            simpl_sep opts defaultSimplSwitches core_td stg_td
 479
 480           "-ffloat-inwards"  -> CORE_TD(CoreDoFloatInwards)
 481           "-ffloat-outwards"      -> CORE_TD(CoreDoFloatOutwards False)
 482           "-ffloat-outwards-full" -> CORE_TD(CoreDoFloatOutwards True)
 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           "-dstg-stats"       -> STG_TD(D_stg_stats)
 495           "-flambda-lift"     -> STG_TD(StgDoLambdaLift)
 496           "-fmassage-stg-for-profiling" -> STG_TD(StgDoMassageForProfiling)
 497
 498           _ -> -- NB: the driver is really supposed to handle bad options
 499                sep opts core_td stg_td
 500
 501     ----------------
 502
 503     simpl_sep :: [FAST_STRING]            -- cmd-line opts (input)
 504               -> [SimplifierSwitch]       -- simplifier-switch accumulator
 505               -> [CoreToDo] -> [StgToDo]  -- to_do accumulators
 506               -> ([CoreToDo], [StgToDo])  -- result
 507
 508         -- "simpl_sep" tailcalls "sep" once it's seen one set
 509         -- of SimplifierSwitches for a CoreDoSimplify.
 510
 511 #ifdef DEBUG
 512     simpl_sep input@[] simpl_sw core_td stg_td
 513       = panic "simpl_sep []"
 514 #endif
 515
 516         -- The SimplifierSwitches should be delimited by "[" and "]".
 517
 518     simpl_sep (opt1:opts) simpl_sw core_td stg_td
 519       = case (_UNPK_ opt1) of
 520           "[" -> simpl_sep opts simpl_sw core_td stg_td
 521           "]" -> let
 522                     this_simpl = CoreDoSimplify (isAmongSimpl simpl_sw)
 523                  in
 524                  sep opts (this_simpl : core_td) stg_td
 525
 526           opt -> case matchSimplSw opt of
 527                         Just sw -> simpl_sep opts (sw:simpl_sw) core_td stg_td
 528                         Nothing -> simpl_sep opts simpl_sw      core_td stg_td
 529
 530 matchSimplSw opt
 531   = firstJust   [ matchSwInt  opt "-fmax-simplifier-iterations"         MaxSimplifierIterations
 532                 , matchSwInt  opt "-finline-phase"                      SimplInlinePhase
 533                 , matchSwBool opt "-fno-rules"                          DontApplyRules
 534                 , matchSwBool opt "-fno-case-of-case"                   NoCaseOfCase
 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*@ constructor, these things behave just like
 555 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 tagOf_SimplSwitch NoCaseOfCase                  = ILIT(5)
 571
 572 -- If you add anything here, be sure to change lAST_SIMPL_SWITCH_TAG, too!
 573
 574 lAST_SIMPL_SWITCH_TAG = 5
 575 \end{code}
 576
 577 %************************************************************************
 578 %*                                                                      *
 579 \subsection{Switch lookup}
 580 %*                                                                      *
 581 %************************************************************************
 582
 583 \begin{code}
 584 isAmongSimpl :: [SimplifierSwitch] -> SimplifierSwitch -> SwitchResult
 585
 586 isAmongSimpl on_switches                -- Switches mentioned later occur *earlier*
 587                                         -- in the list; defaults right at the end.
 588   = let
 589         tidied_on_switches = foldl rm_dups [] on_switches
 590                 -- The fold*l* ensures that we keep the latest switches;
 591                 -- ie the ones that occur earliest in the list.
 592
 593         sw_tbl :: Array Int SwitchResult
 594         sw_tbl = (array (0, lAST_SIMPL_SWITCH_TAG) -- bounds...
 595                         all_undefined)
 596                  // defined_elems
 597
 598         all_undefined = [ (i, SwBool False) | i <- [0 .. lAST_SIMPL_SWITCH_TAG ] ]
 599
 600         defined_elems = map mk_assoc_elem tidied_on_switches
 601     in
 602     -- (avoid some unboxing, bounds checking, and other horrible things:)
 603 #if __GLASGOW_HASKELL__ < 405
 604     case sw_tbl of { Array bounds_who_needs_'em stuff ->
 605 #else
 606     case sw_tbl of { Array _ _ stuff ->
 607 #endif
 608     \ switch ->
 609         case (indexArray# stuff (tagOf_SimplSwitch switch)) of
 610 #if __GLASGOW_HASKELL__ < 400
 611           Lift v -> v
 612 #elif __GLASGOW_HASKELL__ < 403
 613           (# _, v #) -> v
 614 #else
 615           (# v #) -> v
 616 #endif
 617     }
 618   where
 619     mk_assoc_elem k@(MaxSimplifierIterations lvl) = (IBOX(tagOf_SimplSwitch k), SwInt lvl)
 620     mk_assoc_elem k@(SimplInlinePhase n)          = (IBOX(tagOf_SimplSwitch k), SwInt n)
 621     mk_assoc_elem k                               = (IBOX(tagOf_SimplSwitch k), SwBool True) -- I'm here, Mom!
 622
 623     -- cannot have duplicates if we are going to use the array thing
 624     rm_dups switches_so_far switch
 625       = if switch `is_elem` switches_so_far
 626         then switches_so_far
 627         else switch : switches_so_far
 628       where
 629         sw `is_elem` []     = False
 630         sw `is_elem` (s:ss) = (tagOf_SimplSwitch sw) _EQ_ (tagOf_SimplSwitch s)
 631                             || sw `is_elem` ss
 632 \end{code}
 633
 634 Default settings for simplifier switches
 635
 636 \begin{code}
 637 defaultSimplSwitches = [MaxSimplifierIterations 1]
 638 \end{code}
 639
 640 %************************************************************************
 641 %*                                                                      *
 642 \subsection{Misc functions for command-line options}
 643 %*                                                                      *
 644 %************************************************************************
 645
 646
 647 \begin{code}
 648 switchIsOn :: (switch -> SwitchResult) -> switch -> Bool
 649
 650 switchIsOn lookup_fn switch
 651   = case (lookup_fn switch) of
 652       SwBool False -> False
 653       _            -> True
 654
 655 intSwitchSet :: (switch -> SwitchResult)
 656              -> (Int -> switch)
 657              -> Maybe Int
 658
 659 intSwitchSet lookup_fn switch
 660   = case (lookup_fn (switch (panic "intSwitchSet"))) of
 661       SwInt int -> Just int
 662       _         -> Nothing
 663 \end{code}
 664
 665 \begin{code}
 666 startsWith :: String -> String -> Maybe String
 667 -- startsWith pfx (pfx++rest) = Just rest
 668
 669 startsWith []     str = Just str
 670 startsWith (c:cs) (s:ss)
 671   = if c /= s then Nothing else startsWith cs ss
 672 startsWith  _     []  = Nothing
 673
 674 endsWith  :: String -> String -> Maybe String
 675 endsWith cs ss
 676   = case (startsWith (reverse cs) (reverse ss)) of
 677       Nothing -> Nothing
 678       Just rs -> Just (reverse rs)
 679 \end{code}