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         -- debugging opts
  18         opt_D_dump_absC,
  19         opt_D_dump_asm,
  20         opt_D_dump_cpranal,
  21         opt_D_dump_deriv,
  22         opt_D_dump_ds,
  23         opt_D_dump_flatC,
  24         opt_D_dump_foreign,
  25         opt_D_dump_inlinings,
  26         opt_D_dump_occur_anal,
  27         opt_D_dump_rdr,
  28         opt_D_dump_realC,
  29         opt_D_dump_rn,
  30         opt_D_dump_rules,
  31         opt_D_dump_simpl,
  32         opt_D_dump_simpl_iterations,
  33         opt_D_dump_simpl_stats,
  34         opt_D_dump_spec,
  35         opt_D_dump_stg,
  36         opt_D_dump_stranal,
  37         opt_D_dump_tc,
  38         opt_D_dump_usagesp,
  39         opt_D_dump_worker_wrapper,
  40         opt_D_show_passes,
  41         opt_D_dump_rn_trace,
  42         opt_D_dump_rn_stats,
  43         opt_D_source_stats,
  44         opt_D_verbose_core2core,
  45         opt_D_verbose_stg2stg,
  46         opt_DoCoreLinting,
  47         opt_DoStgLinting,
  48         opt_DoUSPLinting,
  49         opt_PprStyle_Debug,
  50         opt_PprStyle_NoPrags,
  51         opt_PprUserLength,
  52
  53         -- warning opts
  54         opt_WarnDuplicateExports,
  55         opt_WarnHiShadows,
  56         opt_WarnIncompletePatterns,
  57         opt_WarnMissingMethods,
  58         opt_WarnMissingSigs,
  59         opt_WarnNameShadowing,
  60         opt_WarnOverlappingPatterns,
  61         opt_WarnSimplePatterns,
  62         opt_WarnTypeDefaults,
  63         opt_WarnUnusedBinds,
  64         opt_WarnUnusedImports,
  65         opt_WarnUnusedMatches,
  66
  67         -- profiling opts
  68         opt_AutoSccsOnAllToplevs,
  69         opt_AutoSccsOnExportedToplevs,
  70         opt_AutoSccsOnIndividualCafs,
  71         opt_AutoSccsOnDicts,
  72         opt_SccGroup,
  73         opt_SccProfilingOn,
  74         opt_DoTickyProfiling,
  75
  76         -- language opts
  77         opt_AllStrict,
  78         opt_DictsStrict,
  79         opt_MaxContextReductionDepth,
  80         opt_AllowOverlappingInstances,
  81         opt_AllowUndecidableInstances,
  82         opt_GlasgowExts,
  83         opt_IrrefutableTuples,
  84         opt_NumbersStrict,
  85         opt_Parallel,
  86
  87         -- optimisation opts
  88         opt_DoEtaReduction,
  89         opt_DoSemiTagging,
  90         opt_FoldrBuildOn,
  91         opt_LiberateCaseThreshold,
  92         opt_NoPreInlining,
  93         opt_StgDoLetNoEscapes,
  94         opt_UnfoldCasms,
  95         opt_UsageSPOn,
  96         opt_UnboxStrictFields,
  97         opt_SimplNoPreInlining,
  98         opt_SimplDoEtaReduction,
  99         opt_SimplDoCaseElim,
 100         opt_SimplDoLambdaEtaExpansion,
 101         opt_SimplCaseOfCase,
 102         opt_SimplCaseMerge,
 103         opt_SimplLetToCase,
 104         opt_SimplPedanticBottoms,
 105
 106         -- Unfolding control
 107         opt_UF_HiFileThreshold,
 108         opt_UF_CreationThreshold,
 109         opt_UF_UseThreshold,
 110         opt_UF_ScrutConDiscount,
 111         opt_UF_FunAppDiscount,
 112         opt_UF_PrimArgDiscount,
 113         opt_UF_KeenessFactor,
 114         opt_UF_CheapOp,
 115         opt_UF_DearOp,
 116         opt_UF_NoRepLit,
 117
 118         -- misc opts
 119         opt_CompilingPrelude,
 120         opt_EmitCExternDecls,
 121         opt_EnsureSplittableC,
 122         opt_GranMacros,
 123         opt_HiMap,
 124         opt_HiVersion,
 125         opt_HistorySize,
 126         opt_IgnoreAsserts,
 127         opt_IgnoreIfacePragmas,
 128         opt_NoHiCheck,
 129         opt_NoImplicitPrelude,
 130         opt_OmitBlackHoling,
 131         opt_OmitInterfacePragmas,
 132         opt_ProduceC,
 133         opt_ProduceExportCStubs,
 134         opt_ProduceExportHStubs,
 135         opt_ProduceHi,
 136         opt_ProduceS,
 137         opt_NoPruneDecls,
 138         opt_ReportCompile,
 139         opt_SourceUnchanged,
 140         opt_Static,
 141         opt_Unregisterised,
 142         opt_Verbose,
 143
 144         -- Code generation
 145         opt_UseVanillaRegs,
 146         opt_UseFloatRegs,
 147         opt_UseDoubleRegs,
 148         opt_UseLongRegs
 149     ) where
 150
 151 #include "HsVersions.h"
 152
 153 import Array    ( array, (//) )
 154 import GlaExts
 155 import Argv
 156 import Constants        -- Default values for some flags
 157
 158 import Maybes           ( assocMaybe, firstJust, maybeToBool )
 159 import Panic            ( panic, panic# )
 160
 161 #if __GLASGOW_HASKELL__ < 301
 162 import ArrBase  ( Array(..) )
 163 #else
 164 import PrelArr  ( Array(..) )
 165 #endif
 166 \end{code}
 167
 168 A command-line {\em switch} is (generally) either on or off; e.g., the
 169 ``verbose'' (-v) switch is either on or off.  (The \tr{-G<group>}
 170 switch is an exception; it's set to a string, or nothing.)
 171
 172 A list of {\em ToDo}s is things to be done in a particular part of
 173 processing.  A (fictitious) example for the Core-to-Core simplifier
 174 might be: run the simplifier, then run the strictness analyser, then
 175 run the simplifier again (three ``todos'').
 176
 177 There are three ``to-do processing centers'' at the moment.  In the
 178 main loop (\tr{main/Main.lhs}), in the Core-to-Core processing loop
 179 (\tr{simplCore/SimplCore.lhs), and in the STG-to-STG processing loop
 180 (\tr{simplStg/SimplStg.lhs}).
 181
 182
 183 %************************************************************************
 184 %*                                                                      *
 185 \subsection{Datatypes associated with command-line options}
 186 %*                                                                      *
 187 %************************************************************************
 188
 189 \begin{code}
 190 data SwitchResult
 191   = SwBool      Bool            -- on/off
 192   | SwString    FAST_STRING     -- nothing or a String
 193   | SwInt       Int             -- nothing or an Int
 194 \end{code}
 195
 196 \begin{code}
 197 data CoreToDo           -- These are diff core-to-core passes,
 198                         -- which may be invoked in any order,
 199                         -- as many times as you like.
 200
 201   = CoreDoSimplify      -- The core-to-core simplifier.
 202         (SimplifierSwitch -> SwitchResult)
 203                         -- Each run of the simplifier can take a different
 204                         -- set of simplifier-specific flags.
 205   | CoreDoFloatInwards
 206   | CoreDoFullLaziness
 207   | CoreLiberateCase
 208   | CoreDoPrintCore
 209   | CoreDoStaticArgs
 210   | CoreDoStrictness
 211   | CoreDoWorkerWrapper
 212   | CoreDoSpecialising
 213   | CoreDoUSPInf
 214   | CoreDoCPResult
 215 \end{code}
 216
 217 \begin{code}
 218 data StgToDo
 219   = StgDoStaticArgs
 220   | StgDoUpdateAnalysis
 221   | StgDoLambdaLift
 222   | StgDoMassageForProfiling  -- should be (next to) last
 223   -- There's also setStgVarInfo, but its absolute "lastness"
 224   -- is so critical that it is hardwired in (no flag).
 225   | D_stg_stats
 226 \end{code}
 227
 228 \begin{code}
 229 data SimplifierSwitch
 230   = MaxSimplifierIterations Int
 231   | SimplInlinePhase Int
 232 \end{code}
 233
 234 %************************************************************************
 235 %*                                                                      *
 236 \subsection{Classifying command-line options}
 237 %*                                                                      *
 238 %************************************************************************
 239
 240 \begin{code}
 241 lookUp           :: FAST_STRING -> Bool
 242 lookup_int       :: String -> Maybe Int
 243 lookup_def_int   :: String -> Int -> Int
 244 lookup_def_float :: String -> Float -> Float
 245 lookup_str       :: String -> Maybe String
 246
 247 lookUp     sw = maybeToBool (assoc_opts sw)
 248
 249 lookup_str sw = firstJust (map (startsWith sw) unpacked_opts)
 250
 251 lookup_int sw = case (lookup_str sw) of
 252                   Nothing -> Nothing
 253                   Just xx -> Just (read xx)
 254
 255 lookup_def_int sw def = case (lookup_str sw) of
 256                             Nothing -> def              -- Use default
 257                             Just xx -> read xx
 258
 259 lookup_def_float sw def = case (lookup_str sw) of
 260                             Nothing -> def              -- Use default
 261                             Just xx -> read xx
 262
 263 assoc_opts    = assocMaybe [ (a, True) | a <- argv ]
 264 unpacked_opts = map _UNPK_ argv
 265
 266 {-
 267  Putting the compiler options into temporary at-files
 268  may turn out to be necessary later on if we turn hsc into
 269  a pure Win32 application where I think there's a command-line
 270  length limit of 255. unpacked_opts understands the @ option.
 271
 272 assoc_opts    = assocMaybe [ (_PK_ a, True) | a <- unpacked_opts ]
 273
 274 unpacked_opts :: [String]
 275 unpacked_opts =
 276   concat $
 277   map (expandAts) $
 278   map _UNPK_ argv
 279   where
 280    expandAts ('@':fname) = words (unsafePerformIO (readFile fname))
 281    expandAts l = [l]
 282 -}
 283 \end{code}
 284
 285 \begin{code}
 286 -- debugging opts
 287 opt_D_dump_absC                 = lookUp  SLIT("-ddump-absC")
 288 opt_D_dump_asm                  = lookUp  SLIT("-ddump-asm")
 289 opt_D_dump_cpranal              = lookUp  SLIT("-ddump-cpranalyse")
 290 opt_D_dump_deriv                = lookUp  SLIT("-ddump-deriv")
 291 opt_D_dump_ds                   = lookUp  SLIT("-ddump-ds")
 292 opt_D_dump_flatC                = lookUp  SLIT("-ddump-flatC")
 293 opt_D_dump_foreign              = lookUp  SLIT("-ddump-foreign-stubs")
 294 opt_D_dump_inlinings            = lookUp  SLIT("-ddump-inlinings")
 295 opt_D_dump_occur_anal           = lookUp  SLIT("-ddump-occur-anal")
 296 opt_D_dump_rdr                  = lookUp  SLIT("-ddump-rdr")
 297 opt_D_dump_realC                = lookUp  SLIT("-ddump-realC")
 298 opt_D_dump_rn                   = lookUp  SLIT("-ddump-rn")
 299 opt_D_dump_simpl                = lookUp  SLIT("-ddump-simpl")
 300 opt_D_dump_simpl_iterations     = lookUp  SLIT("-ddump-simpl-iterations")
 301 opt_D_dump_spec                 = lookUp  SLIT("-ddump-spec")
 302 opt_D_dump_stg                  = lookUp  SLIT("-ddump-stg")
 303 opt_D_dump_stranal              = lookUp  SLIT("-ddump-stranal")
 304 opt_D_dump_tc                   = lookUp  SLIT("-ddump-tc")
 305 opt_D_dump_rules                = lookUp  SLIT("-ddump-rules")
 306 opt_D_dump_usagesp              = lookUp  SLIT("-ddump-usagesp")
 307 opt_D_dump_worker_wrapper       = lookUp  SLIT("-ddump-workwrap")
 308 opt_D_show_passes               = lookUp  SLIT("-dshow-passes")
 309 opt_D_dump_rn_trace             = lookUp  SLIT("-ddump-rn-trace")
 310 opt_D_dump_rn_stats             = lookUp  SLIT("-ddump-rn-stats")
 311 opt_D_dump_simpl_stats          = lookUp  SLIT("-ddump-simpl-stats")
 312 opt_D_source_stats              = lookUp  SLIT("-dsource-stats")
 313 opt_D_verbose_core2core         = lookUp  SLIT("-dverbose-simpl")
 314 opt_D_verbose_stg2stg           = lookUp  SLIT("-dverbose-stg")
 315 opt_DoCoreLinting               = lookUp  SLIT("-dcore-lint")
 316 opt_DoStgLinting                = lookUp  SLIT("-dstg-lint")
 317 opt_DoUSPLinting                = lookUp  SLIT("-dusagesp-lint")
 318 opt_PprStyle_NoPrags            = lookUp  SLIT("-dppr-noprags")
 319 opt_PprStyle_Debug              = lookUp  SLIT("-dppr-debug")
 320 opt_PprUserLength               = lookup_def_int "-dppr-user-length" 5 --ToDo: give this a name
 321
 322 -- warning opts
 323 opt_WarnDuplicateExports        = lookUp  SLIT("-fwarn-duplicate-exports")
 324 opt_WarnHiShadows               = lookUp  SLIT("-fwarn-hi-shadowing")
 325 opt_WarnIncompletePatterns      = lookUp  SLIT("-fwarn-incomplete-patterns")
 326 opt_WarnMissingMethods          = lookUp  SLIT("-fwarn-missing-methods")
 327 opt_WarnMissingSigs             = lookUp  SLIT("-fwarn-missing-signatures")
 328 opt_WarnNameShadowing           = lookUp  SLIT("-fwarn-name-shadowing")
 329 opt_WarnOverlappingPatterns     = lookUp  SLIT("-fwarn-overlapping-patterns")
 330 opt_WarnSimplePatterns          = lookUp  SLIT("-fwarn-simple-patterns")
 331 opt_WarnTypeDefaults            = lookUp  SLIT("-fwarn-type-defaults")
 332 opt_WarnUnusedBinds             = lookUp  SLIT("-fwarn-unused-binds")
 333 opt_WarnUnusedImports           = lookUp  SLIT("-fwarn-unused-imports")
 334 opt_WarnUnusedMatches           = lookUp  SLIT("-fwarn-unused-matches")
 335
 336 -- profiling opts
 337 opt_AutoSccsOnAllToplevs        = lookUp  SLIT("-fauto-sccs-on-all-toplevs")
 338 opt_AutoSccsOnExportedToplevs   = lookUp  SLIT("-fauto-sccs-on-exported-toplevs")
 339 opt_AutoSccsOnIndividualCafs    = lookUp  SLIT("-fauto-sccs-on-individual-cafs")
 340 opt_AutoSccsOnDicts             = lookUp  SLIT("-fauto-sccs-on-dicts")
 341 opt_SccGroup                    = lookup_str "-G="
 342 opt_SccProfilingOn              = lookUp  SLIT("-fscc-profiling")
 343 opt_DoTickyProfiling            = lookUp  SLIT("-fticky-ticky")
 344
 345 -- language opts
 346 opt_AllStrict                   = lookUp  SLIT("-fall-strict")
 347 opt_DictsStrict                 = lookUp  SLIT("-fdicts-strict")
 348 opt_AllowOverlappingInstances   = lookUp  SLIT("-fallow-overlapping-instances")
 349 opt_AllowUndecidableInstances   = lookUp  SLIT("-fallow-undecidable-instances")
 350 opt_GlasgowExts                 = lookUp  SLIT("-fglasgow-exts")
 351 opt_IrrefutableTuples           = lookUp  SLIT("-firrefutable-tuples")
 352 opt_MaxContextReductionDepth    = lookup_def_int "-fcontext-stack" mAX_CONTEXT_REDUCTION_DEPTH
 353 opt_NumbersStrict               = lookUp  SLIT("-fnumbers-strict")
 354 opt_Parallel                    = lookUp  SLIT("-fparallel")
 355
 356 -- optimisation opts
 357 opt_DoEtaReduction              = lookUp  SLIT("-fdo-eta-reduction")
 358 opt_DoSemiTagging               = lookUp  SLIT("-fsemi-tagging")
 359 opt_FoldrBuildOn                = lookUp  SLIT("-ffoldr-build-on")
 360 opt_LiberateCaseThreshold       = lookup_def_int "-fliberate-case-threshold" (10::Int)
 361 opt_NoPreInlining               = lookUp  SLIT("-fno-pre-inlining")
 362 opt_StgDoLetNoEscapes           = lookUp  SLIT("-flet-no-escape")
 363 opt_UnfoldCasms                 = lookUp SLIT("-funfold-casms-in-hi-file")
 364 opt_UsageSPOn                   = lookUp  SLIT("-fusagesp-on")
 365 opt_UnboxStrictFields           = lookUp  SLIT("-funbox-strict-fields")
 366
 367   {-
 368    It's a bit unfortunate to have to re-introduce this chap, but on Win32
 369    platforms we do need a way of distinguishing between the case when we're
 370    compiling a static version of the Prelude and one that's going to be
 371    put into a DLL. Why? Because the compiler's wired in modules need to
 372    be attributed as either coming from a DLL or not.
 373   -}
 374 opt_CompilingPrelude            = lookUp  SLIT("-fcompiling-prelude")
 375 opt_EmitCExternDecls            = lookUp  SLIT("-femit-extern-decls")
 376 opt_EnsureSplittableC           = lookUp  SLIT("-fglobalise-toplev-names")
 377 opt_GranMacros                  = lookUp  SLIT("-fgransim")
 378 opt_HiMap                       = lookup_str "-himap="       -- file saying where to look for .hi files
 379 opt_HiVersion                   = lookup_def_int "-fhi-version=" 0 -- what version we're compiling.
 380 opt_HistorySize                 = lookup_def_int "-fhistory-size" 20
 381 opt_IgnoreAsserts               = lookUp  SLIT("-fignore-asserts")
 382 opt_IgnoreIfacePragmas          = lookUp  SLIT("-fignore-interface-pragmas")
 383 opt_NoHiCheck                   = lookUp  SLIT("-fno-hi-version-check")
 384 opt_NoImplicitPrelude           = lookUp  SLIT("-fno-implicit-prelude")
 385 opt_OmitBlackHoling             = lookUp  SLIT("-dno-black-holing")
 386 opt_OmitInterfacePragmas        = lookUp  SLIT("-fomit-interface-pragmas")
 387 opt_ProduceC                    = lookup_str "-C="
 388 opt_ProduceExportCStubs         = lookup_str "-F="
 389 opt_ProduceExportHStubs         = lookup_str "-FH="
 390 opt_ProduceHi                   = lookup_str "-hifile=" -- the one to produce this time
 391
 392 -- Simplifier switches
 393 opt_SimplNoPreInlining          = lookUp SLIT("-fno-pre-inlining")
 394         -- NoPreInlining is there just to see how bad things
 395         -- get if you don't do it!
 396 opt_SimplDoEtaReduction         = lookUp SLIT("-fdo-eta-reduction")
 397 opt_SimplDoCaseElim             = lookUp SLIT("-fdo-case-elim")
 398 opt_SimplDoLambdaEtaExpansion   = lookUp SLIT("-fdo-lambda-eta-expansion")
 399 opt_SimplCaseOfCase             = lookUp SLIT("-fcase-of-case")
 400 opt_SimplCaseMerge              = lookUp SLIT("-fcase-merge")
 401 opt_SimplLetToCase              = lookUp SLIT("-flet-to-case")
 402 opt_SimplPedanticBottoms        = lookUp SLIT("-fpedantic-bottoms")
 403
 404 -- Unfolding control
 405 opt_UF_HiFileThreshold          = lookup_def_int "-funfolding-interface-threshold" (30::Int)
 406 opt_UF_CreationThreshold        = lookup_def_int "-funfolding-creation-threshold"  (30::Int)
 407 opt_UF_UseThreshold             = lookup_def_int "-funfolding-use-threshold"       (8::Int)     -- Discounts can be big
 408 opt_UF_ScrutConDiscount         = lookup_def_int "-funfolding-con-discount"        (3::Int)
 409 opt_UF_FunAppDiscount           = lookup_def_int "-funfolding-fun-discount"        (6::Int)     -- It's great to inline a fn
 410 opt_UF_PrimArgDiscount          = lookup_def_int "-funfolding-prim-discount"       (1::Int)
 411 opt_UF_KeenessFactor            = lookup_def_float "-funfolding-keeness-factor"    (2.0::Float)
 412
 413 opt_UF_CheapOp  = ( 1 :: Int)
 414 opt_UF_DearOp   = ( 8 :: Int)
 415 opt_UF_NoRepLit = ( 20 :: Int)  -- Strings can be pretty big
 416
 417 opt_ProduceS                    = lookup_str "-S="
 418 opt_ReportCompile               = lookUp SLIT("-freport-compile")
 419 opt_NoPruneDecls                = lookUp SLIT("-fno-prune-decls")
 420 opt_SourceUnchanged             = lookUp SLIT("-fsource-unchanged")
 421 opt_Static                      = lookUp SLIT("-static")
 422 opt_Unregisterised              = lookUp SLIT("-funregisterised")
 423 opt_Verbose                     = lookUp SLIT("-v")
 424
 425 opt_UseVanillaRegs | opt_Unregisterised = 0
 426                    | otherwise          = mAX_Real_Vanilla_REG
 427 opt_UseFloatRegs   | opt_Unregisterised = 0
 428                    | otherwise          = mAX_Real_Float_REG
 429 opt_UseDoubleRegs  | opt_Unregisterised = 0
 430                    | otherwise          = mAX_Real_Double_REG
 431 opt_UseLongRegs    | opt_Unregisterised = 0
 432                    | otherwise          = mAX_Real_Long_REG
 433 \end{code}
 434
 435 \begin{code}
 436 classifyOpts :: ([CoreToDo],    -- Core-to-Core processing spec
 437                  [StgToDo])     -- STG-to-STG   processing spec
 438
 439 classifyOpts = sep argv [] [] -- accumulators...
 440   where
 441     sep :: [FAST_STRING]                 -- cmd-line opts (input)
 442         -> [CoreToDo] -> [StgToDo]       -- to_do accumulators
 443         -> ([CoreToDo], [StgToDo])       -- result
 444
 445     sep [] core_td stg_td -- all done!
 446       = (reverse core_td, reverse stg_td)
 447
 448 #       define CORE_TD(to_do) sep opts (to_do:core_td) stg_td
 449 #       define STG_TD(to_do)  sep opts core_td (to_do:stg_td)
 450
 451     sep (opt1:opts) core_td stg_td
 452       = case (_UNPK_ opt1) of -- the non-"just match a string" options are at the end...
 453           ',' : _       -> sep opts core_td stg_td -- it is for the parser
 454
 455           "-fsimplify"  -> -- gather up SimplifierSwitches specially...
 456                            simpl_sep opts defaultSimplSwitches core_td stg_td
 457
 458           "-ffloat-inwards"  -> CORE_TD(CoreDoFloatInwards)
 459           "-ffull-laziness"  -> CORE_TD(CoreDoFullLaziness)
 460           "-fliberate-case"  -> CORE_TD(CoreLiberateCase)
 461           "-fprint-core"     -> CORE_TD(CoreDoPrintCore)
 462           "-fstatic-args"    -> CORE_TD(CoreDoStaticArgs)
 463           "-fstrictness"     -> CORE_TD(CoreDoStrictness)
 464           "-fworker-wrapper" -> CORE_TD(CoreDoWorkerWrapper)
 465           "-fspecialise"     -> CORE_TD(CoreDoSpecialising)
 466           "-fusagesp"        -> CORE_TD(CoreDoUSPInf)
 467           "-fcpr-analyse"    -> CORE_TD(CoreDoCPResult)
 468
 469           "-fstg-static-args" -> STG_TD(StgDoStaticArgs)
 470           "-fupdate-analysis" -> STG_TD(StgDoUpdateAnalysis)
 471           "-dstg-stats"       -> STG_TD(D_stg_stats)
 472           "-flambda-lift"     -> STG_TD(StgDoLambdaLift)
 473           "-fmassage-stg-for-profiling" -> STG_TD(StgDoMassageForProfiling)
 474
 475           _ -> -- NB: the driver is really supposed to handle bad options
 476                sep opts core_td stg_td
 477
 478     ----------------
 479
 480     simpl_sep :: [FAST_STRING]            -- cmd-line opts (input)
 481               -> [SimplifierSwitch]       -- simplifier-switch accumulator
 482               -> [CoreToDo] -> [StgToDo]  -- to_do accumulators
 483               -> ([CoreToDo], [StgToDo])  -- result
 484
 485         -- "simpl_sep" tailcalls "sep" once it's seen one set
 486         -- of SimplifierSwitches for a CoreDoSimplify.
 487
 488 #ifdef DEBUG
 489     simpl_sep input@[] simpl_sw core_td stg_td
 490       = panic "simpl_sep []"
 491 #endif
 492
 493         -- The SimplifierSwitches should be delimited by "[" and "]".
 494
 495     simpl_sep (opt1:opts) simpl_sw core_td stg_td
 496       = case (_UNPK_ opt1) of
 497           "[" -> simpl_sep opts simpl_sw core_td stg_td
 498           "]" -> let
 499                     this_simpl = CoreDoSimplify (isAmongSimpl simpl_sw)
 500                  in
 501                  sep opts (this_simpl : core_td) stg_td
 502
 503           opt -> case matchSimplSw opt of
 504                         Just sw -> simpl_sep opts (sw:simpl_sw) core_td stg_td
 505                         Nothing -> simpl_sep opts simpl_sw      core_td stg_td
 506
 507 matchSimplSw opt
 508   = firstJust   [ matchSwInt  opt "-fmax-simplifier-iterations"         MaxSimplifierIterations
 509                 , matchSwInt  opt "-finline-phase"                      SimplInlinePhase
 510                 ]
 511
 512 matchSwBool :: String -> String -> a -> Maybe a
 513 matchSwBool opt str sw | opt == str = Just sw
 514                        | otherwise  = Nothing
 515
 516 matchSwInt :: String -> String -> (Int -> a) -> Maybe a
 517 matchSwInt opt str sw = case startsWith str opt of
 518                             Just opt_left -> Just (sw (read opt_left))
 519                             Nothing       -> Nothing
 520 \end{code}
 521
 522 %************************************************************************
 523 %*                                                                      *
 524 \subsection{Switch ordering}
 525 %*                                                                      *
 526 %************************************************************************
 527
 528 In spite of the @Produce*@ and @SccGroup@ constructors, these things
 529 behave just like enumeration types.
 530
 531 \begin{code}
 532 instance Eq SimplifierSwitch where
 533     a == b = tagOf_SimplSwitch a _EQ_ tagOf_SimplSwitch b
 534
 535 instance Ord SimplifierSwitch where
 536     a <  b  = tagOf_SimplSwitch a _LT_ tagOf_SimplSwitch b
 537     a <= b  = tagOf_SimplSwitch a _LE_ tagOf_SimplSwitch b
 538
 539
 540 tagOf_SimplSwitch (SimplInlinePhase _)          = ILIT(1)
 541 tagOf_SimplSwitch (MaxSimplifierIterations _)   = ILIT(2)
 542
 543 -- If you add anything here, be sure to change lAST_SIMPL_SWITCH_TAG, too!
 544
 545 lAST_SIMPL_SWITCH_TAG = 2
 546 \end{code}
 547
 548 %************************************************************************
 549 %*                                                                      *
 550 \subsection{Switch lookup}
 551 %*                                                                      *
 552 %************************************************************************
 553
 554 \begin{code}
 555 isAmongSimpl :: [SimplifierSwitch] -> SimplifierSwitch -> SwitchResult
 556
 557 isAmongSimpl on_switches                -- Switches mentioned later occur *earlier*
 558                                         -- in the list; defaults right at the end.
 559   = let
 560         tidied_on_switches = foldl rm_dups [] on_switches
 561                 -- The fold*l* ensures that we keep the latest switches;
 562                 -- ie the ones that occur earliest in the list.
 563
 564         sw_tbl :: Array Int SwitchResult
 565         sw_tbl = (array (0, lAST_SIMPL_SWITCH_TAG) -- bounds...
 566                         all_undefined)
 567                  // defined_elems
 568
 569         all_undefined = [ (i, SwBool False) | i <- [0 .. lAST_SIMPL_SWITCH_TAG ] ]
 570
 571         defined_elems = map mk_assoc_elem tidied_on_switches
 572     in
 573     -- (avoid some unboxing, bounds checking, and other horrible things:)
 574     case sw_tbl of { Array bounds_who_needs_'em stuff ->
 575     \ switch ->
 576         case (indexArray# stuff (tagOf_SimplSwitch switch)) of
 577 #if __GLASGOW_HASKELL__ < 400
 578           Lift v -> v
 579 #elif __GLASGOW_HASKELL__ < 403
 580           (# _, v #) -> v
 581 #else
 582           (# v #) -> v
 583 #endif
 584     }
 585   where
 586     mk_assoc_elem k@(MaxSimplifierIterations lvl) = (IBOX(tagOf_SimplSwitch k), SwInt lvl)
 587     mk_assoc_elem k@(SimplInlinePhase n)          = (IBOX(tagOf_SimplSwitch k), SwInt n)
 588     mk_assoc_elem k                               = (IBOX(tagOf_SimplSwitch k), SwBool True) -- I'm here, Mom!
 589
 590     -- cannot have duplicates if we are going to use the array thing
 591     rm_dups switches_so_far switch
 592       = if switch `is_elem` switches_so_far
 593         then switches_so_far
 594         else switch : switches_so_far
 595       where
 596         sw `is_elem` []     = False
 597         sw `is_elem` (s:ss) = (tagOf_SimplSwitch sw) _EQ_ (tagOf_SimplSwitch s)
 598                             || sw `is_elem` ss
 599 \end{code}
 600
 601 Default settings for simplifier switches
 602
 603 \begin{code}
 604 defaultSimplSwitches = [MaxSimplifierIterations 1]
 605 \end{code}
 606
 607 %************************************************************************
 608 %*                                                                      *
 609 \subsection{Misc functions for command-line options}
 610 %*                                                                      *
 611 %************************************************************************
 612
 613
 614 \begin{code}
 615 switchIsOn :: (switch -> SwitchResult) -> switch -> Bool
 616
 617 switchIsOn lookup_fn switch
 618   = case (lookup_fn switch) of
 619       SwBool False -> False
 620       _            -> True
 621
 622 intSwitchSet :: (switch -> SwitchResult)
 623              -> (Int -> switch)
 624              -> Maybe Int
 625
 626 intSwitchSet lookup_fn switch
 627   = case (lookup_fn (switch (panic "intSwitchSet"))) of
 628       SwInt int -> Just int
 629       _         -> Nothing
 630 \end{code}
 631
 632 \begin{code}
 633 startsWith :: String -> String -> Maybe String
 634 -- startsWith pfx (pfx++rest) = Just rest
 635
 636 startsWith []     str = Just str
 637 startsWith (c:cs) (s:ss)
 638   = if c /= s then Nothing else startsWith cs ss
 639 startsWith  _     []  = Nothing
 640
 641 endsWith  :: String -> String -> Maybe String
 642 endsWith cs ss
 643   = case (startsWith (reverse cs) (reverse ss)) of
 644       Nothing -> Nothing
 645       Just rs -> Just (reverse rs)
 646 \end{code}