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   | StgDoUpdateAnalysis
 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
 339 opt_DoCoreLinting               = lookUp  SLIT("-dcore-lint")
 340 opt_DoStgLinting                = lookUp  SLIT("-dstg-lint")
 341 opt_DoUSPLinting                = lookUp  SLIT("-dusagesp-lint")
 342 opt_PprStyle_NoPrags            = lookUp  SLIT("-dppr-noprags")
 343 opt_PprStyle_Debug              = lookUp  SLIT("-dppr-debug")
 344 opt_PprUserLength               = lookup_def_int "-dppr-user-length" 5 --ToDo: give this a name
 345
 346 -- warning opts
 347 opt_WarnDuplicateExports        = lookUp  SLIT("-fwarn-duplicate-exports")
 348 opt_WarnHiShadows               = lookUp  SLIT("-fwarn-hi-shadowing")
 349 opt_WarnIncompletePatterns      = lookUp  SLIT("-fwarn-incomplete-patterns")
 350 opt_WarnMissingFields           = lookUp  SLIT("-fwarn-missing-fields")
 351 opt_WarnMissingMethods          = lookUp  SLIT("-fwarn-missing-methods")
 352 opt_WarnMissingSigs             = lookUp  SLIT("-fwarn-missing-signatures")
 353 opt_WarnNameShadowing           = lookUp  SLIT("-fwarn-name-shadowing")
 354 opt_WarnOverlappingPatterns     = lookUp  SLIT("-fwarn-overlapping-patterns")
 355 opt_WarnSimplePatterns          = lookUp  SLIT("-fwarn-simple-patterns")
 356 opt_WarnTypeDefaults            = lookUp  SLIT("-fwarn-type-defaults")
 357 opt_WarnUnusedBinds             = lookUp  SLIT("-fwarn-unused-binds")
 358 opt_WarnUnusedImports           = lookUp  SLIT("-fwarn-unused-imports")
 359 opt_WarnUnusedMatches           = lookUp  SLIT("-fwarn-unused-matches")
 360 opt_WarnDeprecations            = lookUp  SLIT("-fwarn-deprecations")
 361
 362 -- profiling opts
 363 opt_AutoSccsOnAllToplevs        = lookUp  SLIT("-fauto-sccs-on-all-toplevs")
 364 opt_AutoSccsOnExportedToplevs   = lookUp  SLIT("-fauto-sccs-on-exported-toplevs")
 365 opt_AutoSccsOnIndividualCafs    = lookUp  SLIT("-fauto-sccs-on-individual-cafs")
 366 opt_AutoSccsOnDicts             = lookUp  SLIT("-fauto-sccs-on-dicts")
 367 opt_SccProfilingOn              = lookUp  SLIT("-fscc-profiling")
 368 opt_DoTickyProfiling            = lookUp  SLIT("-fticky-ticky")
 369
 370 -- language opts
 371 opt_AllStrict                   = lookUp  SLIT("-fall-strict")
 372 opt_DictsStrict                 = lookUp  SLIT("-fdicts-strict")
 373 opt_AllowOverlappingInstances   = lookUp  SLIT("-fallow-overlapping-instances")
 374 opt_AllowUndecidableInstances   = lookUp  SLIT("-fallow-undecidable-instances")
 375 opt_GlasgowExts                 = lookUp  SLIT("-fglasgow-exts")
 376 opt_IrrefutableTuples           = lookUp  SLIT("-firrefutable-tuples")
 377 opt_MaxContextReductionDepth    = lookup_def_int "-fcontext-stack" mAX_CONTEXT_REDUCTION_DEPTH
 378 opt_NumbersStrict               = lookUp  SLIT("-fnumbers-strict")
 379 opt_Parallel                    = lookUp  SLIT("-fparallel")
 380 opt_SMP                         = lookUp  SLIT("-fsmp")
 381
 382 -- optimisation opts
 383 opt_DoEtaReduction              = lookUp  SLIT("-fdo-eta-reduction")
 384 opt_DoSemiTagging               = lookUp  SLIT("-fsemi-tagging")
 385 opt_FoldrBuildOn                = lookUp  SLIT("-ffoldr-build-on")
 386 opt_LiberateCaseThreshold       = lookup_def_int "-fliberate-case-threshold" (10::Int)
 387 opt_StgDoLetNoEscapes           = lookUp  SLIT("-flet-no-escape")
 388 opt_UnfoldCasms                 = lookUp SLIT("-funfold-casms-in-hi-file")
 389 opt_UsageSPOn                   = lookUp  SLIT("-fusagesp-on")
 390 opt_UnboxStrictFields           = lookUp  SLIT("-funbox-strict-fields")
 391
 392   {-
 393    It's a bit unfortunate to have to re-introduce this chap, but on Win32
 394    platforms we do need a way of distinguishing between the case when we're
 395    compiling a static version of the Prelude and one that's going to be
 396    put into a DLL. Why? Because the compiler's wired in modules need to
 397    be attributed as either coming from a DLL or not.
 398   -}
 399 opt_CompilingPrelude            = lookUp  SLIT("-fcompiling-prelude")
 400 opt_EmitCExternDecls            = lookUp  SLIT("-femit-extern-decls")
 401 opt_EnsureSplittableC           = lookUp  SLIT("-fglobalise-toplev-names")
 402 opt_GranMacros                  = lookUp  SLIT("-fgransim")
 403 opt_HiMap                       = lookup_str "-himap="       -- file saying where to look for .hi files
 404 opt_HiMapSep                    = lookup_def_char "-himap-sep=" ':'
 405 opt_HiVersion                   = lookup_def_int "-fhi-version=" 0 -- what version we're compiling.
 406 opt_HistorySize                 = lookup_def_int "-fhistory-size" 20
 407 opt_IgnoreAsserts               = lookUp  SLIT("-fignore-asserts")
 408 opt_IgnoreIfacePragmas          = lookUp  SLIT("-fignore-interface-pragmas")
 409 opt_NoHiCheck                   = lookUp  SLIT("-fno-hi-version-check")
 410 opt_NoImplicitPrelude           = lookUp  SLIT("-fno-implicit-prelude")
 411 opt_OmitBlackHoling             = lookUp  SLIT("-dno-black-holing")
 412 opt_OmitInterfacePragmas        = lookUp  SLIT("-fomit-interface-pragmas")
 413 opt_ProduceC                    = lookup_str "-C="
 414 opt_ProduceExportCStubs         = lookup_str "-F="
 415 opt_ProduceExportHStubs         = lookup_str "-FH="
 416 opt_ProduceHi                   = lookup_str "-hifile=" -- the one to produce this time
 417
 418 -- Simplifier switches
 419 opt_SimplNoPreInlining          = lookUp SLIT("-fno-pre-inlining")
 420         -- NoPreInlining is there just to see how bad things
 421         -- get if you don't do it!
 422 opt_SimplDoEtaReduction         = lookUp SLIT("-fdo-eta-reduction")
 423 opt_SimplDoLambdaEtaExpansion   = lookUp SLIT("-fdo-lambda-eta-expansion")
 424 opt_SimplCaseOfCase             = lookUp SLIT("-fcase-of-case")
 425 opt_SimplCaseMerge              = lookUp SLIT("-fcase-merge")
 426 opt_SimplPedanticBottoms        = lookUp SLIT("-fpedantic-bottoms")
 427
 428 -- Unfolding control
 429 opt_UF_HiFileThreshold          = lookup_def_int "-funfolding-interface-threshold" (45::Int)
 430 opt_UF_CreationThreshold        = lookup_def_int "-funfolding-creation-threshold"  (45::Int)
 431 opt_UF_UseThreshold             = lookup_def_int "-funfolding-use-threshold"       (8::Int)     -- Discounts can be big
 432 opt_UF_ScrutConDiscount         = lookup_def_int "-funfolding-con-discount"        (2::Int)
 433 opt_UF_FunAppDiscount           = lookup_def_int "-funfolding-fun-discount"        (6::Int)     -- It's great to inline a fn
 434 opt_UF_PrimArgDiscount          = lookup_def_int "-funfolding-prim-discount"       (1::Int)
 435 opt_UF_KeenessFactor            = lookup_def_float "-funfolding-keeness-factor"    (1.5::Float)
 436
 437 opt_UF_CheapOp  = ( 1 :: Int)   -- Only one instruction; and the args are charged for
 438 opt_UF_DearOp   = ( 4 :: Int)
 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           "-ffloat-outwards"      -> CORE_TD(CoreDoFloatOutwards False)
 483           "-ffloat-outwards-full" -> CORE_TD(CoreDoFloatOutwards True)
 484           "-fliberate-case"  -> CORE_TD(CoreLiberateCase)
 485           "-fcse"            -> CORE_TD(CoreCSE)
 486           "-fprint-core"     -> CORE_TD(CoreDoPrintCore)
 487           "-fstatic-args"    -> CORE_TD(CoreDoStaticArgs)
 488           "-fstrictness"     -> CORE_TD(CoreDoStrictness)
 489           "-fworker-wrapper" -> CORE_TD(CoreDoWorkerWrapper)
 490           "-fspecialise"     -> CORE_TD(CoreDoSpecialising)
 491           "-fusagesp"        -> CORE_TD(CoreDoUSPInf)
 492           "-fcpr-analyse"    -> CORE_TD(CoreDoCPResult)
 493
 494           "-fstg-static-args" -> STG_TD(StgDoStaticArgs)
 495           "-fupdate-analysis" -> STG_TD(StgDoUpdateAnalysis)
 496           "-dstg-stats"       -> STG_TD(D_stg_stats)
 497           "-flambda-lift"     -> STG_TD(StgDoLambdaLift)
 498           "-fmassage-stg-for-profiling" -> STG_TD(StgDoMassageForProfiling)
 499
 500           _ -> -- NB: the driver is really supposed to handle bad options
 501                sep opts core_td stg_td
 502
 503     ----------------
 504
 505     simpl_sep :: [FAST_STRING]            -- cmd-line opts (input)
 506               -> [SimplifierSwitch]       -- simplifier-switch accumulator
 507               -> [CoreToDo] -> [StgToDo]  -- to_do accumulators
 508               -> ([CoreToDo], [StgToDo])  -- result
 509
 510         -- "simpl_sep" tailcalls "sep" once it's seen one set
 511         -- of SimplifierSwitches for a CoreDoSimplify.
 512
 513 #ifdef DEBUG
 514     simpl_sep input@[] simpl_sw core_td stg_td
 515       = panic "simpl_sep []"
 516 #endif
 517
 518         -- The SimplifierSwitches should be delimited by "[" and "]".
 519
 520     simpl_sep (opt1:opts) simpl_sw core_td stg_td
 521       = case (_UNPK_ opt1) of
 522           "[" -> simpl_sep opts simpl_sw core_td stg_td
 523           "]" -> let
 524                     this_simpl = CoreDoSimplify (isAmongSimpl simpl_sw)
 525                  in
 526                  sep opts (this_simpl : core_td) stg_td
 527
 528           opt -> case matchSimplSw opt of
 529                         Just sw -> simpl_sep opts (sw:simpl_sw) core_td stg_td
 530                         Nothing -> simpl_sep opts simpl_sw      core_td stg_td
 531
 532 matchSimplSw opt
 533   = firstJust   [ matchSwInt  opt "-fmax-simplifier-iterations"         MaxSimplifierIterations
 534                 , matchSwInt  opt "-finline-phase"                      SimplInlinePhase
 535                 , matchSwBool opt "-fno-rules"                          DontApplyRules
 536                 , matchSwBool opt "-fno-case-of-case"                   NoCaseOfCase
 537                 , matchSwBool opt "-flet-to-case"                       SimplLetToCase
 538                 ]
 539
 540 matchSwBool :: String -> String -> a -> Maybe a
 541 matchSwBool opt str sw | opt == str = Just sw
 542                        | otherwise  = Nothing
 543
 544 matchSwInt :: String -> String -> (Int -> a) -> Maybe a
 545 matchSwInt opt str sw = case startsWith str opt of
 546                             Just opt_left -> Just (sw (read opt_left))
 547                             Nothing       -> Nothing
 548 \end{code}
 549
 550 %************************************************************************
 551 %*                                                                      *
 552 \subsection{Switch ordering}
 553 %*                                                                      *
 554 %************************************************************************
 555
 556 In spite of the @Produce*@ constructor, these things behave just like
 557 enumeration types.
 558
 559 \begin{code}
 560 instance Eq SimplifierSwitch where
 561     a == b = tagOf_SimplSwitch a _EQ_ tagOf_SimplSwitch b
 562
 563 instance Ord SimplifierSwitch where
 564     a <  b  = tagOf_SimplSwitch a _LT_ tagOf_SimplSwitch b
 565     a <= b  = tagOf_SimplSwitch a _LE_ tagOf_SimplSwitch b
 566
 567
 568 tagOf_SimplSwitch (SimplInlinePhase _)          = ILIT(1)
 569 tagOf_SimplSwitch (MaxSimplifierIterations _)   = ILIT(2)
 570 tagOf_SimplSwitch DontApplyRules                = ILIT(3)
 571 tagOf_SimplSwitch SimplLetToCase                = ILIT(4)
 572 tagOf_SimplSwitch NoCaseOfCase                  = ILIT(5)
 573
 574 -- If you add anything here, be sure to change lAST_SIMPL_SWITCH_TAG, too!
 575
 576 lAST_SIMPL_SWITCH_TAG = 5
 577 \end{code}
 578
 579 %************************************************************************
 580 %*                                                                      *
 581 \subsection{Switch lookup}
 582 %*                                                                      *
 583 %************************************************************************
 584
 585 \begin{code}
 586 isAmongSimpl :: [SimplifierSwitch] -> SimplifierSwitch -> SwitchResult
 587
 588 isAmongSimpl on_switches                -- Switches mentioned later occur *earlier*
 589                                         -- in the list; defaults right at the end.
 590   = let
 591         tidied_on_switches = foldl rm_dups [] on_switches
 592                 -- The fold*l* ensures that we keep the latest switches;
 593                 -- ie the ones that occur earliest in the list.
 594
 595         sw_tbl :: Array Int SwitchResult
 596         sw_tbl = (array (0, lAST_SIMPL_SWITCH_TAG) -- bounds...
 597                         all_undefined)
 598                  // defined_elems
 599
 600         all_undefined = [ (i, SwBool False) | i <- [0 .. lAST_SIMPL_SWITCH_TAG ] ]
 601
 602         defined_elems = map mk_assoc_elem tidied_on_switches
 603     in
 604     -- (avoid some unboxing, bounds checking, and other horrible things:)
 605 #if __GLASGOW_HASKELL__ < 405
 606     case sw_tbl of { Array bounds_who_needs_'em stuff ->
 607 #else
 608     case sw_tbl of { Array _ _ stuff ->
 609 #endif
 610     \ switch ->
 611         case (indexArray# stuff (tagOf_SimplSwitch switch)) of
 612 #if __GLASGOW_HASKELL__ < 400
 613           Lift v -> v
 614 #elif __GLASGOW_HASKELL__ < 403
 615           (# _, v #) -> v
 616 #else
 617           (# v #) -> v
 618 #endif
 619     }
 620   where
 621     mk_assoc_elem k@(MaxSimplifierIterations lvl) = (IBOX(tagOf_SimplSwitch k), SwInt lvl)
 622     mk_assoc_elem k@(SimplInlinePhase n)          = (IBOX(tagOf_SimplSwitch k), SwInt n)
 623     mk_assoc_elem k                               = (IBOX(tagOf_SimplSwitch k), SwBool True) -- I'm here, Mom!
 624
 625     -- cannot have duplicates if we are going to use the array thing
 626     rm_dups switches_so_far switch
 627       = if switch `is_elem` switches_so_far
 628         then switches_so_far
 629         else switch : switches_so_far
 630       where
 631         sw `is_elem` []     = False
 632         sw `is_elem` (s:ss) = (tagOf_SimplSwitch sw) _EQ_ (tagOf_SimplSwitch s)
 633                             || sw `is_elem` ss
 634 \end{code}
 635
 636 Default settings for simplifier switches
 637
 638 \begin{code}
 639 defaultSimplSwitches = [MaxSimplifierIterations 1]
 640 \end{code}
 641
 642 %************************************************************************
 643 %*                                                                      *
 644 \subsection{Misc functions for command-line options}
 645 %*                                                                      *
 646 %************************************************************************
 647
 648
 649 \begin{code}
 650 switchIsOn :: (switch -> SwitchResult) -> switch -> Bool
 651
 652 switchIsOn lookup_fn switch
 653   = case (lookup_fn switch) of
 654       SwBool False -> False
 655       _            -> True
 656
 657 intSwitchSet :: (switch -> SwitchResult)
 658              -> (Int -> switch)
 659              -> Maybe Int
 660
 661 intSwitchSet lookup_fn switch
 662   = case (lookup_fn (switch (panic "intSwitchSet"))) of
 663       SwInt int -> Just int
 664       _         -> Nothing
 665 \end{code}
 666
 667 \begin{code}
 668 startsWith :: String -> String -> Maybe String
 669 -- startsWith pfx (pfx++rest) = Just rest
 670
 671 startsWith []     str = Just str
 672 startsWith (c:cs) (s:ss)
 673   = if c /= s then Nothing else startsWith cs ss
 674 startsWith  _     []  = Nothing
 675
 676 endsWith  :: String -> String -> Maybe String
 677 endsWith cs ss
 678   = case (startsWith (reverse cs) (reverse ss)) of
 679       Nothing -> Nothing
 680       Just rs -> Just (reverse rs)
 681 \end{code}