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_types,
  42         opt_D_dump_usagesp,
  43         opt_D_dump_worker_wrapper,
  44         opt_D_show_passes,
  45         opt_D_dump_rn_trace,
  46         opt_D_dump_rn_stats,
  47         opt_D_dump_stix,
  48         opt_D_dump_minimal_imports,
  49         opt_D_source_stats,
  50         opt_D_verbose_core2core,
  51         opt_D_verbose_stg2stg,
  52         opt_DoCoreLinting,
  53         opt_DoStgLinting,
  54         opt_DoUSPLinting,
  55         opt_PprStyle_Debug,
  56         opt_PprStyle_NoPrags,
  57         opt_PprUserLength,
  58
  59         -- warning opts
  60         opt_WarnDuplicateExports,
  61         opt_WarnHiShadows,
  62         opt_WarnIncompletePatterns,
  63         opt_WarnMissingFields,
  64         opt_WarnMissingMethods,
  65         opt_WarnMissingSigs,
  66         opt_WarnNameShadowing,
  67         opt_WarnOverlappingPatterns,
  68         opt_WarnSimplePatterns,
  69         opt_WarnTypeDefaults,
  70         opt_WarnUnusedBinds,
  71         opt_WarnUnusedImports,
  72         opt_WarnUnusedMatches,
  73         opt_WarnDeprecations,
  74
  75         -- profiling opts
  76         opt_AutoSccsOnAllToplevs,
  77         opt_AutoSccsOnExportedToplevs,
  78         opt_AutoSccsOnIndividualCafs,
  79         opt_AutoSccsOnDicts,
  80         opt_SccProfilingOn,
  81         opt_DoTickyProfiling,
  82
  83         -- language opts
  84         opt_AllStrict,
  85         opt_DictsStrict,
  86         opt_MaxContextReductionDepth,
  87         opt_AllowOverlappingInstances,
  88         opt_AllowUndecidableInstances,
  89         opt_GlasgowExts,
  90         opt_IrrefutableTuples,
  91         opt_NumbersStrict,
  92         opt_Parallel,
  93         opt_SMP,
  94
  95         -- optimisation opts
  96         opt_DoEtaReduction,
  97         opt_DoSemiTagging,
  98         opt_FoldrBuildOn,
  99         opt_LiberateCaseThreshold,
 100         opt_StgDoLetNoEscapes,
 101         opt_UnfoldCasms,
 102         opt_UsageSPOn,
 103         opt_UnboxStrictFields,
 104         opt_SimplNoPreInlining,
 105         opt_SimplDoEtaReduction,
 106         opt_SimplDoLambdaEtaExpansion,
 107         opt_SimplCaseOfCase,
 108         opt_SimplCaseMerge,
 109         opt_SimplPedanticBottoms,
 110         opt_SimplExcessPrecision,
 111
 112         -- Unfolding control
 113         opt_UF_HiFileThreshold,
 114         opt_UF_CreationThreshold,
 115         opt_UF_UseThreshold,
 116         opt_UF_ScrutConDiscount,
 117         opt_UF_FunAppDiscount,
 118         opt_UF_PrimArgDiscount,
 119         opt_UF_KeenessFactor,
 120         opt_UF_CheapOp,
 121         opt_UF_DearOp,
 122
 123         -- misc opts
 124         opt_InPackage,
 125         opt_EmitCExternDecls,
 126         opt_EnsureSplittableC,
 127         opt_GranMacros,
 128         opt_HiMap,
 129         opt_HiMapSep,
 130         opt_HiVersion,
 131         opt_HistorySize,
 132         opt_IgnoreAsserts,
 133         opt_IgnoreIfacePragmas,
 134         opt_NoHiCheck,
 135         opt_NoImplicitPrelude,
 136         opt_OmitBlackHoling,
 137         opt_OmitInterfacePragmas,
 138         opt_ProduceExportCStubs,
 139         opt_ProduceExportHStubs,
 140         opt_HiFile,
 141         opt_HiDir,
 142         opt_HiSuf,
 143         opt_NoPruneTyDecls,
 144         opt_NoPruneDecls,
 145         opt_ReportCompile,
 146         opt_SourceUnchanged,
 147         opt_Static,
 148         opt_Unregisterised,
 149         opt_Verbose,
 150
 151         opt_OutputLanguage,
 152         opt_OutputFile,
 153
 154         -- Code generation
 155         opt_UseVanillaRegs,
 156         opt_UseFloatRegs,
 157         opt_UseDoubleRegs,
 158         opt_UseLongRegs
 159     ) where
 160
 161 #include "HsVersions.h"
 162
 163 import Array    ( array, (//) )
 164 import GlaExts
 165 import Argv
 166 import Constants        -- Default values for some flags
 167
 168 import FastString       ( headFS )
 169 import Maybes           ( assocMaybe, firstJust, maybeToBool )
 170 import Panic            ( panic, panic# )
 171
 172 #if __GLASGOW_HASKELL__ < 301
 173 import ArrBase  ( Array(..) )
 174 #else
 175 import PrelArr  ( Array(..) )
 176 #endif
 177 \end{code}
 178
 179 A command-line {\em switch} is (generally) either on or off; e.g., the
 180 ``verbose'' (-v) switch is either on or off.
 181
 182 A list of {\em ToDo}s is things to be done in a particular part of
 183 processing.  A (fictitious) example for the Core-to-Core simplifier
 184 might be: run the simplifier, then run the strictness analyser, then
 185 run the simplifier again (three ``todos'').
 186
 187 There are three ``to-do processing centers'' at the moment.  In the
 188 main loop (\tr{main/Main.lhs}), in the Core-to-Core processing loop
 189 (\tr{simplCore/SimplCore.lhs), and in the STG-to-STG processing loop
 190 (\tr{simplStg/SimplStg.lhs}).
 191
 192
 193 %************************************************************************
 194 %*                                                                      *
 195 \subsection{Datatypes associated with command-line options}
 196 %*                                                                      *
 197 %************************************************************************
 198
 199 \begin{code}
 200 data SwitchResult
 201   = SwBool      Bool            -- on/off
 202   | SwString    FAST_STRING     -- nothing or a String
 203   | SwInt       Int             -- nothing or an Int
 204 \end{code}
 205
 206 \begin{code}
 207 data CoreToDo           -- These are diff core-to-core passes,
 208                         -- which may be invoked in any order,
 209                         -- as many times as you like.
 210
 211   = CoreDoSimplify      -- The core-to-core simplifier.
 212         (SimplifierSwitch -> SwitchResult)
 213                         -- Each run of the simplifier can take a different
 214                         -- set of simplifier-specific flags.
 215   | CoreDoFloatInwards
 216   | CoreDoFloatOutwards Bool    -- True <=> float lambdas to top level
 217   | CoreLiberateCase
 218   | CoreDoPrintCore
 219   | CoreDoStaticArgs
 220   | CoreDoStrictness
 221   | CoreDoWorkerWrapper
 222   | CoreDoSpecialising
 223   | CoreDoUSPInf
 224   | CoreDoCPResult
 225   | CoreDoGlomBinds
 226   | CoreCSE
 227 \end{code}
 228
 229 \begin{code}
 230 data StgToDo
 231   = StgDoStaticArgs
 232   | StgDoLambdaLift
 233   | StgDoMassageForProfiling  -- should be (next to) last
 234   -- There's also setStgVarInfo, but its absolute "lastness"
 235   -- is so critical that it is hardwired in (no flag).
 236   | D_stg_stats
 237 \end{code}
 238
 239 \begin{code}
 240 data SimplifierSwitch
 241   = MaxSimplifierIterations Int
 242   | SimplInlinePhase Int
 243   | DontApplyRules
 244   | NoCaseOfCase
 245   | SimplLetToCase
 246 \end{code}
 247
 248 %************************************************************************
 249 %*                                                                      *
 250 \subsection{Classifying command-line options}
 251 %*                                                                      *
 252 %************************************************************************
 253
 254 \begin{code}
 255 lookUp           :: FAST_STRING -> Bool
 256 lookup_int       :: String -> Maybe Int
 257 lookup_def_int   :: String -> Int -> Int
 258 lookup_def_float :: String -> Float -> Float
 259 lookup_str       :: String -> Maybe String
 260
 261 lookUp     sw = maybeToBool (assoc_opts sw)
 262
 263 lookup_str sw = firstJust (map (startsWith sw) unpacked_opts)
 264
 265 lookup_int sw = case (lookup_str sw) of
 266                   Nothing -> Nothing
 267                   Just xx -> Just (read xx)
 268
 269 lookup_def_int sw def = case (lookup_str sw) of
 270                             Nothing -> def              -- Use default
 271                             Just xx -> read xx
 272
 273 lookup_def_char sw def = case (lookup_str sw) of
 274                             Just (xx:_) -> xx
 275                             _           -> def          -- Use default
 276
 277 lookup_def_float sw def = case (lookup_str sw) of
 278                             Nothing -> def              -- Use default
 279                             Just xx -> read xx
 280
 281 assoc_opts    = assocMaybe [ (a, True) | a <- argv ]
 282 unpacked_opts = map _UNPK_ argv
 283
 284 {-
 285  Putting the compiler options into temporary at-files
 286  may turn out to be necessary later on if we turn hsc into
 287  a pure Win32 application where I think there's a command-line
 288  length limit of 255. unpacked_opts understands the @ option.
 289
 290 assoc_opts    = assocMaybe [ (_PK_ a, True) | a <- unpacked_opts ]
 291
 292 unpacked_opts :: [String]
 293 unpacked_opts =
 294   concat $
 295   map (expandAts) $
 296   map _UNPK_ argv
 297   where
 298    expandAts ('@':fname) = words (unsafePerformIO (readFile fname))
 299    expandAts l = [l]
 300 -}
 301 \end{code}
 302
 303 \begin{code}
 304 src_filename :: FAST_STRING
 305 src_filename = case argv of
 306                   filename : rest | headFS filename /= '-' -> filename
 307                   otherwise -> panic "no filename"
 308 \end{code}
 309
 310 \begin{code}
 311 -- debugging opts
 312 opt_D_dump_all   {- do not -}   = lookUp  SLIT("-ddump-all")
 313 opt_D_dump_most  {- export -}   = opt_D_dump_all  || lookUp  SLIT("-ddump-most")
 314
 315 opt_D_dump_absC                 = opt_D_dump_all  || lookUp  SLIT("-ddump-absC")
 316 opt_D_dump_asm                  = opt_D_dump_all  || lookUp  SLIT("-ddump-asm")
 317 opt_D_dump_cpranal              = opt_D_dump_most || lookUp  SLIT("-ddump-cpranal")
 318 opt_D_dump_deriv                = opt_D_dump_most || lookUp  SLIT("-ddump-deriv")
 319 opt_D_dump_ds                   = opt_D_dump_most || lookUp  SLIT("-ddump-ds")
 320 opt_D_dump_flatC                = opt_D_dump_all  || lookUp  SLIT("-ddump-flatC")
 321 opt_D_dump_foreign              = opt_D_dump_most || lookUp  SLIT("-ddump-foreign-stubs")
 322 opt_D_dump_inlinings            = opt_D_dump_all  || lookUp  SLIT("-ddump-inlinings")
 323 opt_D_dump_occur_anal           = opt_D_dump_all  || lookUp  SLIT("-ddump-occur-anal")
 324 opt_D_dump_parsed               = opt_D_dump_most || lookUp  SLIT("-ddump-parsed")
 325 opt_D_dump_realC                = opt_D_dump_all  || lookUp  SLIT("-ddump-realC")
 326 opt_D_dump_rn                   = opt_D_dump_most || lookUp  SLIT("-ddump-rn")
 327 opt_D_dump_simpl                = opt_D_dump_most || lookUp  SLIT("-ddump-simpl")
 328 opt_D_dump_simpl_iterations     = opt_D_dump_all  || lookUp  SLIT("-ddump-simpl-iterations")
 329 opt_D_dump_spec                 = opt_D_dump_most || lookUp  SLIT("-ddump-spec")
 330 opt_D_dump_stg                  = opt_D_dump_most || lookUp  SLIT("-ddump-stg")
 331 opt_D_dump_stranal              = opt_D_dump_most || lookUp  SLIT("-ddump-stranal")
 332 opt_D_dump_tc                   = opt_D_dump_most || lookUp  SLIT("-ddump-tc")
 333 opt_D_dump_types                = opt_D_dump_most || lookUp  SLIT("-ddump-types")
 334 opt_D_dump_rules                = opt_D_dump_most || lookUp  SLIT("-ddump-rules")
 335 opt_D_dump_usagesp              = opt_D_dump_most || lookUp  SLIT("-ddump-usagesp")
 336 opt_D_dump_cse                  = opt_D_dump_most || lookUp  SLIT("-ddump-cse")
 337 opt_D_dump_worker_wrapper       = opt_D_dump_most || lookUp  SLIT("-ddump-workwrap")
 338 opt_D_show_passes               = opt_D_dump_most || lookUp  SLIT("-dshow-passes")
 339 opt_D_dump_rn_trace             = opt_D_dump_all  || lookUp  SLIT("-ddump-rn-trace")
 340 opt_D_dump_rn_stats             = opt_D_dump_most || lookUp  SLIT("-ddump-rn-stats")
 341 opt_D_dump_stix                 = opt_D_dump_all  || lookUp  SLIT("-ddump-stix")
 342 opt_D_dump_simpl_stats          = opt_D_dump_most || lookUp  SLIT("-ddump-simpl-stats")
 343 opt_D_source_stats              = opt_D_dump_most || lookUp  SLIT("-dsource-stats")
 344 opt_D_verbose_core2core         = opt_D_dump_all  || lookUp  SLIT("-dverbose-simpl")
 345 opt_D_verbose_stg2stg           = opt_D_dump_all  || lookUp  SLIT("-dverbose-stg")
 346 opt_D_dump_minimal_imports      = lookUp  SLIT("-ddump-minimal-imports")
 347
 348 opt_DoCoreLinting               = lookUp  SLIT("-dcore-lint")
 349 opt_DoStgLinting                = lookUp  SLIT("-dstg-lint")
 350 opt_DoUSPLinting                = lookUp  SLIT("-dusagesp-lint")
 351 opt_PprStyle_NoPrags            = lookUp  SLIT("-dppr-noprags")
 352 opt_PprStyle_Debug              = lookUp  SLIT("-dppr-debug")
 353 opt_PprUserLength               = lookup_def_int "-dppr-user-length" 5 --ToDo: give this a name
 354
 355 -- warning opts
 356 opt_WarnDuplicateExports        = lookUp  SLIT("-fwarn-duplicate-exports")
 357 opt_WarnHiShadows               = lookUp  SLIT("-fwarn-hi-shadowing")
 358 opt_WarnIncompletePatterns      = lookUp  SLIT("-fwarn-incomplete-patterns")
 359 opt_WarnMissingFields           = lookUp  SLIT("-fwarn-missing-fields")
 360 opt_WarnMissingMethods          = lookUp  SLIT("-fwarn-missing-methods")
 361 opt_WarnMissingSigs             = lookUp  SLIT("-fwarn-missing-signatures")
 362 opt_WarnNameShadowing           = lookUp  SLIT("-fwarn-name-shadowing")
 363 opt_WarnOverlappingPatterns     = lookUp  SLIT("-fwarn-overlapping-patterns")
 364 opt_WarnSimplePatterns          = lookUp  SLIT("-fwarn-simple-patterns")
 365 opt_WarnTypeDefaults            = lookUp  SLIT("-fwarn-type-defaults")
 366 opt_WarnUnusedBinds             = lookUp  SLIT("-fwarn-unused-binds")
 367 opt_WarnUnusedImports           = lookUp  SLIT("-fwarn-unused-imports")
 368 opt_WarnUnusedMatches           = lookUp  SLIT("-fwarn-unused-matches")
 369 opt_WarnDeprecations            = lookUp  SLIT("-fwarn-deprecations")
 370
 371 -- profiling opts
 372 opt_AutoSccsOnAllToplevs        = lookUp  SLIT("-fauto-sccs-on-all-toplevs")
 373 opt_AutoSccsOnExportedToplevs   = lookUp  SLIT("-fauto-sccs-on-exported-toplevs")
 374 opt_AutoSccsOnIndividualCafs    = lookUp  SLIT("-fauto-sccs-on-individual-cafs")
 375 opt_AutoSccsOnDicts             = lookUp  SLIT("-fauto-sccs-on-dicts")
 376 opt_SccProfilingOn              = lookUp  SLIT("-fscc-profiling")
 377 opt_DoTickyProfiling            = lookUp  SLIT("-fticky-ticky")
 378
 379 -- language opts
 380 opt_AllStrict                   = lookUp  SLIT("-fall-strict")
 381 opt_DictsStrict                 = lookUp  SLIT("-fdicts-strict")
 382 opt_AllowOverlappingInstances   = lookUp  SLIT("-fallow-overlapping-instances")
 383 opt_AllowUndecidableInstances   = lookUp  SLIT("-fallow-undecidable-instances")
 384 opt_GlasgowExts                 = lookUp  SLIT("-fglasgow-exts")
 385 opt_IrrefutableTuples           = lookUp  SLIT("-firrefutable-tuples")
 386 opt_MaxContextReductionDepth    = lookup_def_int "-fcontext-stack" mAX_CONTEXT_REDUCTION_DEPTH
 387 opt_NumbersStrict               = lookUp  SLIT("-fnumbers-strict")
 388 opt_Parallel                    = lookUp  SLIT("-fparallel")
 389 opt_SMP                         = lookUp  SLIT("-fsmp")
 390
 391 -- optimisation opts
 392 opt_DoEtaReduction              = lookUp  SLIT("-fdo-eta-reduction")
 393 opt_DoSemiTagging               = lookUp  SLIT("-fsemi-tagging")
 394 opt_FoldrBuildOn                = lookUp  SLIT("-ffoldr-build-on")
 395 opt_LiberateCaseThreshold       = lookup_def_int "-fliberate-case-threshold" (10::Int)
 396 opt_StgDoLetNoEscapes           = lookUp  SLIT("-flet-no-escape")
 397 opt_UnfoldCasms                 = lookUp SLIT("-funfold-casms-in-hi-file")
 398 opt_UsageSPOn                   = lookUp  SLIT("-fusagesp-on")
 399 opt_UnboxStrictFields           = lookUp  SLIT("-funbox-strict-fields")
 400
 401 {-
 402    The optional '-inpackage=P' flag tells what package
 403    we are compiling this module for.
 404    The Prelude, for example is compiled with '-package prelude'
 405 -}
 406 opt_InPackage                   = case lookup_str "-inpackage=" of
 407                                     Just p  -> _PK_ p
 408                                     Nothing -> SLIT("Main")     -- The package name if none is specified
 409
 410 opt_EmitCExternDecls            = lookUp  SLIT("-femit-extern-decls")
 411 opt_EnsureSplittableC           = lookUp  SLIT("-fglobalise-toplev-names")
 412 opt_GranMacros                  = lookUp  SLIT("-fgransim")
 413 opt_HiMap                       = lookup_str "-himap="       -- file saying where to look for .hi files
 414 opt_HiMapSep                    = lookup_def_char "-himap-sep=" ':'
 415 opt_HiVersion                   = lookup_def_int "-fhi-version=" 0 -- what version we're compiling.
 416 opt_HistorySize                 = lookup_def_int "-fhistory-size" 20
 417 opt_IgnoreAsserts               = lookUp  SLIT("-fignore-asserts")
 418 opt_IgnoreIfacePragmas          = lookUp  SLIT("-fignore-interface-pragmas")
 419 opt_NoHiCheck                   = lookUp  SLIT("-fno-hi-version-check")
 420 opt_NoImplicitPrelude           = lookUp  SLIT("-fno-implicit-prelude")
 421 opt_OmitBlackHoling             = lookUp  SLIT("-dno-black-holing")
 422 opt_OmitInterfacePragmas        = lookUp  SLIT("-fomit-interface-pragmas")
 423 opt_ProduceExportCStubs         = lookup_str "-F="
 424 opt_ProduceExportHStubs         = lookup_str "-FH="
 425
 426 -- where to generate the .hi file
 427 opt_HiFile                      = lookup_str "-hifile="
 428 opt_HiDir                       = lookup_str "-hidir="
 429 opt_HiSuf                       = lookup_str "-hisuf="
 430
 431 -- Language for output: "C", "asm", "java", maybe more
 432 -- Nothing => don't output anything
 433 opt_OutputLanguage :: Maybe String
 434 opt_OutputLanguage = lookup_str "-olang="
 435
 436 opt_OutputFile :: String
 437 opt_OutputFile     = case lookup_str "-ofile=" of
 438                         Nothing -> panic "No output file specified (-ofile=xxx)"
 439                         Just f  -> f
 440
 441 -- Simplifier switches
 442 opt_SimplNoPreInlining          = lookUp SLIT("-fno-pre-inlining")
 443         -- NoPreInlining is there just to see how bad things
 444         -- get if you don't do it!
 445 opt_SimplDoEtaReduction         = lookUp SLIT("-fdo-eta-reduction")
 446 opt_SimplDoLambdaEtaExpansion   = lookUp SLIT("-fdo-lambda-eta-expansion")
 447 opt_SimplCaseOfCase             = lookUp SLIT("-fcase-of-case")
 448 opt_SimplCaseMerge              = lookUp SLIT("-fcase-merge")
 449 opt_SimplPedanticBottoms        = lookUp SLIT("-fpedantic-bottoms")
 450 opt_SimplExcessPrecision        = lookUp SLIT("-fexcess-precision")
 451
 452 -- Unfolding control
 453 opt_UF_HiFileThreshold          = lookup_def_int "-funfolding-interface-threshold" (45::Int)
 454 opt_UF_CreationThreshold        = lookup_def_int "-funfolding-creation-threshold"  (45::Int)
 455 opt_UF_UseThreshold             = lookup_def_int "-funfolding-use-threshold"       (8::Int)     -- Discounts can be big
 456 opt_UF_ScrutConDiscount         = lookup_def_int "-funfolding-con-discount"        (2::Int)
 457 opt_UF_FunAppDiscount           = lookup_def_int "-funfolding-fun-discount"        (6::Int)     -- It's great to inline a fn
 458 opt_UF_PrimArgDiscount          = lookup_def_int "-funfolding-prim-discount"       (1::Int)
 459 opt_UF_KeenessFactor            = lookup_def_float "-funfolding-keeness-factor"    (1.5::Float)
 460
 461 opt_UF_CheapOp  = ( 1 :: Int)   -- Only one instruction; and the args are charged for
 462 opt_UF_DearOp   = ( 4 :: Int)
 463
 464 opt_ReportCompile               = lookUp SLIT("-freport-compile")
 465 opt_NoPruneDecls                = lookUp SLIT("-fno-prune-decls")
 466 opt_NoPruneTyDecls              = lookUp SLIT("-fno-prune-tydecls")
 467 opt_SourceUnchanged             = lookUp SLIT("-fsource-unchanged")
 468 opt_Static                      = lookUp SLIT("-static")
 469 opt_Unregisterised              = lookUp SLIT("-funregisterised")
 470 opt_Verbose                     = lookUp SLIT("-v")
 471
 472 opt_UseVanillaRegs | opt_Unregisterised = 0
 473                    | otherwise          = mAX_Real_Vanilla_REG
 474 opt_UseFloatRegs   | opt_Unregisterised = 0
 475                    | otherwise          = mAX_Real_Float_REG
 476 opt_UseDoubleRegs  | opt_Unregisterised = 0
 477                    | otherwise          = mAX_Real_Double_REG
 478 opt_UseLongRegs    | opt_Unregisterised = 0
 479                    | otherwise          = mAX_Real_Long_REG
 480 \end{code}
 481
 482 \begin{code}
 483 classifyOpts :: ([CoreToDo],    -- Core-to-Core processing spec
 484                  [StgToDo])     -- STG-to-STG   processing spec
 485
 486 classifyOpts = sep argv [] [] -- accumulators...
 487   where
 488     sep :: [FAST_STRING]                 -- cmd-line opts (input)
 489         -> [CoreToDo] -> [StgToDo]       -- to_do accumulators
 490         -> ([CoreToDo], [StgToDo])       -- result
 491
 492     sep [] core_td stg_td -- all done!
 493       = (reverse core_td, reverse stg_td)
 494
 495 #       define CORE_TD(to_do) sep opts (to_do:core_td) stg_td
 496 #       define STG_TD(to_do)  sep opts core_td (to_do:stg_td)
 497
 498     sep (opt1:opts) core_td stg_td
 499       = case (_UNPK_ opt1) of -- the non-"just match a string" options are at the end...
 500           ',' : _       -> sep opts core_td stg_td -- it is for the parser
 501
 502           "-fsimplify"  -> -- gather up SimplifierSwitches specially...
 503                            simpl_sep opts defaultSimplSwitches core_td stg_td
 504
 505           "-ffloat-inwards"  -> CORE_TD(CoreDoFloatInwards)
 506           "-ffloat-outwards"      -> CORE_TD(CoreDoFloatOutwards False)
 507           "-ffloat-outwards-full" -> CORE_TD(CoreDoFloatOutwards True)
 508           "-fliberate-case"  -> CORE_TD(CoreLiberateCase)
 509           "-fcse"            -> CORE_TD(CoreCSE)
 510           "-fglom-binds"     -> CORE_TD(CoreDoGlomBinds)
 511           "-fprint-core"     -> CORE_TD(CoreDoPrintCore)
 512           "-fstatic-args"    -> CORE_TD(CoreDoStaticArgs)
 513           "-fstrictness"     -> CORE_TD(CoreDoStrictness)
 514           "-fworker-wrapper" -> CORE_TD(CoreDoWorkerWrapper)
 515           "-fspecialise"     -> CORE_TD(CoreDoSpecialising)
 516           "-fusagesp"        -> CORE_TD(CoreDoUSPInf)
 517           "-fcpr-analyse"    -> CORE_TD(CoreDoCPResult)
 518
 519           "-fstg-static-args" -> STG_TD(StgDoStaticArgs)
 520           "-dstg-stats"       -> STG_TD(D_stg_stats)
 521           "-flambda-lift"     -> STG_TD(StgDoLambdaLift)
 522           "-fmassage-stg-for-profiling" -> STG_TD(StgDoMassageForProfiling)
 523
 524           _ -> -- NB: the driver is really supposed to handle bad options
 525                sep opts core_td stg_td
 526
 527     ----------------
 528
 529     simpl_sep :: [FAST_STRING]            -- cmd-line opts (input)
 530               -> [SimplifierSwitch]       -- simplifier-switch accumulator
 531               -> [CoreToDo] -> [StgToDo]  -- to_do accumulators
 532               -> ([CoreToDo], [StgToDo])  -- result
 533
 534         -- "simpl_sep" tailcalls "sep" once it's seen one set
 535         -- of SimplifierSwitches for a CoreDoSimplify.
 536
 537 #ifdef DEBUG
 538     simpl_sep input@[] simpl_sw core_td stg_td
 539       = panic "simpl_sep []"
 540 #endif
 541
 542         -- The SimplifierSwitches should be delimited by "[" and "]".
 543
 544     simpl_sep (opt1:opts) simpl_sw core_td stg_td
 545       = case (_UNPK_ opt1) of
 546           "[" -> simpl_sep opts simpl_sw core_td stg_td
 547           "]" -> let
 548                     this_simpl = CoreDoSimplify (isAmongSimpl simpl_sw)
 549                  in
 550                  sep opts (this_simpl : core_td) stg_td
 551
 552           opt -> case matchSimplSw opt of
 553                         Just sw -> simpl_sep opts (sw:simpl_sw) core_td stg_td
 554                         Nothing -> simpl_sep opts simpl_sw      core_td stg_td
 555
 556 matchSimplSw opt
 557   = firstJust   [ matchSwInt  opt "-fmax-simplifier-iterations"         MaxSimplifierIterations
 558                 , matchSwInt  opt "-finline-phase"                      SimplInlinePhase
 559                 , matchSwBool opt "-fno-rules"                          DontApplyRules
 560                 , matchSwBool opt "-fno-case-of-case"                   NoCaseOfCase
 561                 , matchSwBool opt "-flet-to-case"                       SimplLetToCase
 562                 ]
 563
 564 matchSwBool :: String -> String -> a -> Maybe a
 565 matchSwBool opt str sw | opt == str = Just sw
 566                        | otherwise  = Nothing
 567
 568 matchSwInt :: String -> String -> (Int -> a) -> Maybe a
 569 matchSwInt opt str sw = case startsWith str opt of
 570                             Just opt_left -> Just (sw (read opt_left))
 571                             Nothing       -> Nothing
 572 \end{code}
 573
 574 %************************************************************************
 575 %*                                                                      *
 576 \subsection{Switch ordering}
 577 %*                                                                      *
 578 %************************************************************************
 579
 580 In spite of the @Produce*@ constructor, these things behave just like
 581 enumeration types.
 582
 583 \begin{code}
 584 instance Eq SimplifierSwitch where
 585     a == b = tagOf_SimplSwitch a _EQ_ tagOf_SimplSwitch b
 586
 587 instance Ord SimplifierSwitch where
 588     a <  b  = tagOf_SimplSwitch a _LT_ tagOf_SimplSwitch b
 589     a <= b  = tagOf_SimplSwitch a _LE_ tagOf_SimplSwitch b
 590
 591
 592 tagOf_SimplSwitch (SimplInlinePhase _)          = ILIT(1)
 593 tagOf_SimplSwitch (MaxSimplifierIterations _)   = ILIT(2)
 594 tagOf_SimplSwitch DontApplyRules                = ILIT(3)
 595 tagOf_SimplSwitch SimplLetToCase                = ILIT(4)
 596 tagOf_SimplSwitch NoCaseOfCase                  = ILIT(5)
 597
 598 -- If you add anything here, be sure to change lAST_SIMPL_SWITCH_TAG, too!
 599
 600 lAST_SIMPL_SWITCH_TAG = 5
 601 \end{code}
 602
 603 %************************************************************************
 604 %*                                                                      *
 605 \subsection{Switch lookup}
 606 %*                                                                      *
 607 %************************************************************************
 608
 609 \begin{code}
 610 isAmongSimpl :: [SimplifierSwitch] -> SimplifierSwitch -> SwitchResult
 611
 612 isAmongSimpl on_switches                -- Switches mentioned later occur *earlier*
 613                                         -- in the list; defaults right at the end.
 614   = let
 615         tidied_on_switches = foldl rm_dups [] on_switches
 616                 -- The fold*l* ensures that we keep the latest switches;
 617                 -- ie the ones that occur earliest in the list.
 618
 619         sw_tbl :: Array Int SwitchResult
 620         sw_tbl = (array (0, lAST_SIMPL_SWITCH_TAG) -- bounds...
 621                         all_undefined)
 622                  // defined_elems
 623
 624         all_undefined = [ (i, SwBool False) | i <- [0 .. lAST_SIMPL_SWITCH_TAG ] ]
 625
 626         defined_elems = map mk_assoc_elem tidied_on_switches
 627     in
 628     -- (avoid some unboxing, bounds checking, and other horrible things:)
 629 #if __GLASGOW_HASKELL__ < 405
 630     case sw_tbl of { Array bounds_who_needs_'em stuff ->
 631 #else
 632     case sw_tbl of { Array _ _ stuff ->
 633 #endif
 634     \ switch ->
 635         case (indexArray# stuff (tagOf_SimplSwitch switch)) of
 636 #if __GLASGOW_HASKELL__ < 400
 637           Lift v -> v
 638 #elif __GLASGOW_HASKELL__ < 403
 639           (# _, v #) -> v
 640 #else
 641           (# v #) -> v
 642 #endif
 643     }
 644   where
 645     mk_assoc_elem k@(MaxSimplifierIterations lvl) = (IBOX(tagOf_SimplSwitch k), SwInt lvl)
 646     mk_assoc_elem k@(SimplInlinePhase n)          = (IBOX(tagOf_SimplSwitch k), SwInt n)
 647     mk_assoc_elem k                               = (IBOX(tagOf_SimplSwitch k), SwBool True) -- I'm here, Mom!
 648
 649     -- cannot have duplicates if we are going to use the array thing
 650     rm_dups switches_so_far switch
 651       = if switch `is_elem` switches_so_far
 652         then switches_so_far
 653         else switch : switches_so_far
 654       where
 655         sw `is_elem` []     = False
 656         sw `is_elem` (s:ss) = (tagOf_SimplSwitch sw) _EQ_ (tagOf_SimplSwitch s)
 657                             || sw `is_elem` ss
 658 \end{code}
 659
 660 Default settings for simplifier switches
 661
 662 \begin{code}
 663 defaultSimplSwitches = [MaxSimplifierIterations 1]
 664 \end{code}
 665
 666 %************************************************************************
 667 %*                                                                      *
 668 \subsection{Misc functions for command-line options}
 669 %*                                                                      *
 670 %************************************************************************
 671
 672
 673 \begin{code}
 674 switchIsOn :: (switch -> SwitchResult) -> switch -> Bool
 675
 676 switchIsOn lookup_fn switch
 677   = case (lookup_fn switch) of
 678       SwBool False -> False
 679       _            -> True
 680
 681 intSwitchSet :: (switch -> SwitchResult)
 682              -> (Int -> switch)
 683              -> Maybe Int
 684
 685 intSwitchSet lookup_fn switch
 686   = case (lookup_fn (switch (panic "intSwitchSet"))) of
 687       SwInt int -> Just int
 688       _         -> Nothing
 689 \end{code}
 690
 691 \begin{code}
 692 startsWith :: String -> String -> Maybe String
 693 -- startsWith pfx (pfx++rest) = Just rest
 694
 695 startsWith []     str = Just str
 696 startsWith (c:cs) (s:ss)
 697   = if c /= s then Nothing else startsWith cs ss
 698 startsWith  _     []  = Nothing
 699
 700 endsWith  :: String -> String -> Maybe String
 701 endsWith cs ss
 702   = case (startsWith (reverse cs) (reverse ss)) of
 703       Nothing -> Nothing
 704       Just rs -> Just (reverse rs)
 705 \end{code}