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_simpl,
  31         opt_D_dump_simpl_iterations,
  32         opt_D_dump_spec,
  33         opt_D_dump_stg,
  34         opt_D_dump_stranal,
  35         opt_D_dump_tc,
  36         opt_D_dump_usagesp,
  37         opt_D_dump_worker_wrapper,
  38         opt_D_show_passes,
  39         opt_D_show_rn_imports,
  40         opt_D_show_rn_stats,
  41         opt_D_show_rn_trace,
  42         opt_D_simplifier_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_InterfaceUnfoldThreshold,
  92         opt_LiberateCaseThreshold,
  93         opt_NoPreInlining,
  94         opt_StgDoLetNoEscapes,
  95         opt_UnfoldCasms,
  96         opt_UnfoldingConDiscount,
  97         opt_UnfoldingCreationThreshold,
  98         opt_UnfoldingKeenessFactor,
  99         opt_UnfoldingUseThreshold,
 100         opt_UsageSPOn,
 101         opt_UnboxStrictFields,
 102
 103         -- misc opts
 104         opt_CompilingPrelude,
 105         opt_EmitCExternDecls,
 106         opt_EnsureSplittableC,
 107         opt_GranMacros,
 108         opt_HiMap,
 109         opt_HiVersion,
 110         opt_IgnoreAsserts,
 111         opt_IgnoreIfacePragmas,
 112         opt_NoHiCheck,
 113         opt_NoImplicitPrelude,
 114         opt_OmitBlackHoling,
 115         opt_OmitInterfacePragmas,
 116         opt_ProduceC,
 117         opt_ProduceExportCStubs,
 118         opt_ProduceExportHStubs,
 119         opt_ProduceHi,
 120         opt_ProduceS,
 121         opt_PruneInstDecls,
 122         opt_PruneTyDecls,
 123         opt_ReportCompile,
 124         opt_SourceUnchanged,
 125         opt_Static,
 126         opt_Unregisterised,
 127         opt_Verbose,
 128
 129         opt_UseVanillaRegs,
 130         opt_UseFloatRegs,
 131         opt_UseDoubleRegs,
 132         opt_UseLongRegs
 133     ) where
 134
 135 #include "HsVersions.h"
 136
 137 import Array    ( array, (//) )
 138 import GlaExts
 139 import Argv
 140 import Constants        -- Default values for some flags
 141
 142 import Maybes           ( assocMaybe, firstJust, maybeToBool )
 143 import Panic            ( panic, panic# )
 144
 145 #if __GLASGOW_HASKELL__ < 301
 146 import ArrBase  ( Array(..) )
 147 #else
 148 import PrelArr  ( Array(..) )
 149 #endif
 150 \end{code}
 151
 152 A command-line {\em switch} is (generally) either on or off; e.g., the
 153 ``verbose'' (-v) switch is either on or off.  (The \tr{-G<group>}
 154 switch is an exception; it's set to a string, or nothing.)
 155
 156 A list of {\em ToDo}s is things to be done in a particular part of
 157 processing.  A (fictitious) example for the Core-to-Core simplifier
 158 might be: run the simplifier, then run the strictness analyser, then
 159 run the simplifier again (three ``todos'').
 160
 161 There are three ``to-do processing centers'' at the moment.  In the
 162 main loop (\tr{main/Main.lhs}), in the Core-to-Core processing loop
 163 (\tr{simplCore/SimplCore.lhs), and in the STG-to-STG processing loop
 164 (\tr{simplStg/SimplStg.lhs}).
 165
 166 %************************************************************************
 167 %*                                                                      *
 168 \subsection{Datatypes associated with command-line options}
 169 %*                                                                      *
 170 %************************************************************************
 171
 172 \begin{code}
 173 data SwitchResult
 174   = SwBool      Bool            -- on/off
 175   | SwString    FAST_STRING     -- nothing or a String
 176   | SwInt       Int             -- nothing or an Int
 177 \end{code}
 178
 179 \begin{code}
 180 data CoreToDo           -- These are diff core-to-core passes,
 181                         -- which may be invoked in any order,
 182                         -- as many times as you like.
 183
 184   = CoreDoSimplify      -- The core-to-core simplifier.
 185         (SimplifierSwitch -> SwitchResult)
 186                         -- Each run of the simplifier can take a different
 187                         -- set of simplifier-specific flags.
 188   | CoreDoCalcInlinings1
 189   | CoreDoCalcInlinings2
 190   | CoreDoFloatInwards
 191   | CoreDoFullLaziness
 192   | CoreLiberateCase
 193   | CoreDoPrintCore
 194   | CoreDoStaticArgs
 195   | CoreDoStrictness
 196   | CoreDoWorkerWrapper
 197   | CoreDoSpecialising
 198   | CoreDoFoldrBuildWorkerWrapper
 199   | CoreDoFoldrBuildWWAnal
 200   | CoreDoUSPInf
 201   | CoreDoCPResult
 202 \end{code}
 203
 204 \begin{code}
 205 data StgToDo
 206   = StgDoStaticArgs
 207   | StgDoUpdateAnalysis
 208   | StgDoLambdaLift
 209   | StgDoMassageForProfiling  -- should be (next to) last
 210   -- There's also setStgVarInfo, but its absolute "lastness"
 211   -- is so critical that it is hardwired in (no flag).
 212   | D_stg_stats
 213 \end{code}
 214
 215 \begin{code}
 216 data SimplifierSwitch
 217   = SimplOkToDupCode
 218   | SimplFloatLetsExposingWHNF
 219   | SimplOkToFloatPrimOps
 220   | SimplAlwaysFloatLetsFromLets
 221   | SimplDoCaseElim
 222   | SimplCaseOfCase
 223   | SimplLetToCase
 224   | SimplMayDeleteConjurableIds
 225   | SimplPedanticBottoms -- see Simplifier for an explanation
 226   | SimplDoArityExpand   -- expand arity of bindings
 227   | SimplDoFoldrBuild    -- This is the per-simplification flag;
 228                          -- see also FoldrBuildOn, used elsewhere
 229                          -- in the compiler.
 230   | SimplDoInlineFoldrBuild
 231                          -- inline foldr/build (*after* f/b rule is used)
 232
 233   | IgnoreINLINEPragma
 234   | SimplDoLambdaEtaExpansion
 235
 236   | EssentialUnfoldingsOnly -- never mind the thresholds, only
 237                             -- do unfoldings that *must* be done
 238                             -- (to saturate constructors and primitives)
 239
 240   | MaxSimplifierIterations Int
 241
 242   | SimplNoLetFromCase      -- used when turning off floating entirely
 243   | SimplNoLetFromApp       -- (for experimentation only) WDP 95/10
 244   | SimplNoLetFromStrictLet
 245
 246   | SimplCaseMerge
 247   | SimplPleaseClone
 248 \end{code}
 249
 250 %************************************************************************
 251 %*                                                                      *
 252 \subsection{Classifying command-line options}
 253 %*                                                                      *
 254 %************************************************************************
 255
 256 \begin{code}
 257 lookUp           :: FAST_STRING -> Bool
 258 lookup_int       :: String -> Maybe Int
 259 lookup_def_int   :: String -> Int -> Int
 260 lookup_def_float :: String -> Float -> Float
 261 lookup_str       :: String -> Maybe String
 262
 263 lookUp     sw = maybeToBool (assoc_opts sw)
 264
 265 lookup_str sw = firstJust (map (startsWith sw) unpacked_opts)
 266
 267 lookup_int sw = case (lookup_str sw) of
 268                   Nothing -> Nothing
 269                   Just xx -> Just (read xx)
 270
 271 lookup_def_int sw def = case (lookup_str sw) of
 272                             Nothing -> def              -- Use default
 273                             Just xx -> read xx
 274
 275 lookup_def_float sw def = case (lookup_str sw) of
 276                             Nothing -> def              -- Use default
 277                             Just xx -> read xx
 278
 279 assoc_opts    = assocMaybe [ (a, True) | a <- argv ]
 280 unpacked_opts = map _UNPK_ argv
 281
 282 {-
 283  Putting the compiler options into temporary at-files
 284  may turn out to be necessary later on if we turn hsc into
 285  a pure Win32 application where I think there's a command-line
 286  length limit of 255. unpacked_opts understands the @ option.
 287
 288 assoc_opts    = assocMaybe [ (_PK_ a, True) | a <- unpacked_opts ]
 289
 290 unpacked_opts :: [String]
 291 unpacked_opts =
 292   concat $
 293   map (expandAts) $
 294   map _UNPK_ argv
 295   where
 296    expandAts ('@':fname) = words (unsafePerformIO (readFile fname))
 297    expandAts l = [l]
 298 -}
 299 \end{code}
 300
 301 \begin{code}
 302 -- debugging opts
 303 opt_D_dump_absC                 = lookUp  SLIT("-ddump-absC")
 304 opt_D_dump_asm                  = lookUp  SLIT("-ddump-asm")
 305 opt_D_dump_cpranal              = lookUp  SLIT("-ddump-cpranalyse")
 306 opt_D_dump_deriv                = lookUp  SLIT("-ddump-deriv")
 307 opt_D_dump_ds                   = lookUp  SLIT("-ddump-ds")
 308 opt_D_dump_flatC                = lookUp  SLIT("-ddump-flatC")
 309 opt_D_dump_foreign              = lookUp  SLIT("-ddump-foreign-stubs")
 310 opt_D_dump_inlinings            = lookUp  SLIT("-ddump-inlinings")
 311 opt_D_dump_occur_anal           = lookUp  SLIT("-ddump-occur-anal")
 312 opt_D_dump_rdr                  = lookUp  SLIT("-ddump-rdr")
 313 opt_D_dump_realC                = lookUp  SLIT("-ddump-realC")
 314 opt_D_dump_rn                   = lookUp  SLIT("-ddump-rn")
 315 opt_D_dump_simpl                = lookUp  SLIT("-ddump-simpl")
 316 opt_D_dump_simpl_iterations     = lookUp  SLIT("-ddump-simpl-iterations")
 317 opt_D_dump_spec                 = lookUp  SLIT("-ddump-spec")
 318 opt_D_dump_stg                  = lookUp  SLIT("-ddump-stg")
 319 opt_D_dump_stranal              = lookUp  SLIT("-ddump-stranal")
 320 opt_D_dump_tc                   = lookUp  SLIT("-ddump-tc")
 321 opt_D_dump_usagesp              = lookUp  SLIT("-ddump-usagesp")
 322 opt_D_dump_worker_wrapper       = lookUp  SLIT("-ddump-workwrap")
 323 opt_D_show_passes               = lookUp  SLIT("-dshow-passes")
 324 opt_D_show_rn_imports           = lookUp  SLIT("-dshow-rn-imports")
 325 opt_D_show_rn_trace             = lookUp  SLIT("-dshow-rn-trace")
 326 opt_D_show_rn_stats             = lookUp SLIT("-dshow-rn-stats")
 327 opt_D_simplifier_stats          = lookUp  SLIT("-dsimplifier-stats")
 328 opt_D_source_stats              = lookUp  SLIT("-dsource-stats")
 329 opt_D_verbose_core2core         = lookUp  SLIT("-dverbose-simpl")
 330 opt_D_verbose_stg2stg           = lookUp  SLIT("-dverbose-stg")
 331 opt_DoCoreLinting               = lookUp  SLIT("-dcore-lint")
 332 opt_DoStgLinting                = lookUp  SLIT("-dstg-lint")
 333 opt_DoUSPLinting                = lookUp  SLIT("-dusagesp-lint")
 334 opt_PprStyle_NoPrags            = lookUp  SLIT("-dppr-noprags")
 335 opt_PprStyle_Debug              = lookUp  SLIT("-dppr-debug")
 336 opt_PprUserLength               = lookup_def_int "-dppr-user-length" 5 --ToDo: give this a name
 337
 338 -- warning opts
 339 opt_WarnDuplicateExports        = lookUp  SLIT("-fwarn-duplicate-exports")
 340 opt_WarnHiShadows               = lookUp  SLIT("-fwarn-hi-shadowing")
 341 opt_WarnIncompletePatterns      = lookUp  SLIT("-fwarn-incomplete-patterns")
 342 opt_WarnMissingMethods          = lookUp  SLIT("-fwarn-missing-methods")
 343 opt_WarnMissingSigs             = lookUp  SLIT("-fwarn-missing-signatures")
 344 opt_WarnNameShadowing           = lookUp  SLIT("-fwarn-name-shadowing")
 345 opt_WarnOverlappingPatterns     = lookUp  SLIT("-fwarn-overlapping-patterns")
 346 opt_WarnSimplePatterns          = lookUp  SLIT("-fwarn-simple-patterns")
 347 opt_WarnTypeDefaults            = lookUp  SLIT("-fwarn-type-defaults")
 348 opt_WarnUnusedBinds             = lookUp  SLIT("-fwarn-unused-binds")
 349 opt_WarnUnusedImports           = lookUp  SLIT("-fwarn-unused-imports")
 350 opt_WarnUnusedMatches           = lookUp  SLIT("-fwarn-unused-matches")
 351
 352 -- profiling opts
 353 opt_AutoSccsOnAllToplevs        = lookUp  SLIT("-fauto-sccs-on-all-toplevs")
 354 opt_AutoSccsOnExportedToplevs   = lookUp  SLIT("-fauto-sccs-on-exported-toplevs")
 355 opt_AutoSccsOnIndividualCafs    = lookUp  SLIT("-fauto-sccs-on-individual-cafs")
 356 opt_AutoSccsOnDicts             = lookUp  SLIT("-fauto-sccs-on-dicts")
 357 opt_SccGroup                    = lookup_str "-G="
 358 opt_SccProfilingOn              = lookUp  SLIT("-fscc-profiling")
 359 opt_DoTickyProfiling            = lookUp  SLIT("-fticky-ticky")
 360
 361 -- language opts
 362 opt_AllStrict                   = lookUp  SLIT("-fall-strict")
 363 opt_DictsStrict                 = lookUp  SLIT("-fdicts-strict")
 364 opt_AllowOverlappingInstances   = lookUp  SLIT("-fallow-overlapping-instances")
 365 opt_AllowUndecidableInstances   = lookUp  SLIT("-fallow-undecidable-instances")
 366 opt_GlasgowExts                 = lookUp  SLIT("-fglasgow-exts")
 367 opt_IrrefutableTuples           = lookUp  SLIT("-firrefutable-tuples")
 368 opt_MaxContextReductionDepth    = lookup_def_int "-fcontext-stack" mAX_CONTEXT_REDUCTION_DEPTH
 369 opt_NumbersStrict               = lookUp  SLIT("-fnumbers-strict")
 370 opt_Parallel                    = lookUp  SLIT("-fparallel")
 371
 372 -- optimisation opts
 373 opt_DoEtaReduction              = lookUp  SLIT("-fdo-eta-reduction")
 374 opt_DoSemiTagging               = lookUp  SLIT("-fsemi-tagging")
 375 opt_FoldrBuildOn                = lookUp  SLIT("-ffoldr-build-on")
 376 opt_InterfaceUnfoldThreshold    = lookup_def_int "-funfolding-interface-threshold" iNTERFACE_UNFOLD_THRESHOLD
 377 opt_LiberateCaseThreshold       = lookup_def_int "-fliberate-case-threshold"       lIBERATE_CASE_THRESHOLD
 378 opt_NoPreInlining               = lookUp  SLIT("-fno-pre-inlining")
 379 opt_StgDoLetNoEscapes           = lookUp  SLIT("-flet-no-escape")
 380 opt_UnfoldCasms                 = lookUp SLIT("-funfold-casms-in-hi-file")
 381 opt_UnfoldingConDiscount        = lookup_def_int "-funfolding-con-discount"        uNFOLDING_CON_DISCOUNT_WEIGHT
 382 opt_UnfoldingCreationThreshold  = lookup_def_int "-funfolding-creation-threshold"  uNFOLDING_CREATION_THRESHOLD
 383 opt_UnfoldingKeenessFactor      = lookup_def_float "-funfolding-keeness-factor"    uNFOLDING_KEENESS_FACTOR
 384 opt_UnfoldingUseThreshold       = lookup_def_int "-funfolding-use-threshold"       uNFOLDING_USE_THRESHOLD
 385 opt_UsageSPOn                   = lookUp  SLIT("-fusagesp-on")
 386 opt_UnboxStrictFields           = lookUp  SLIT("-funbox-strict-fields")
 387
 388   {-
 389    It's a bit unfortunate to have to re-introduce this chap, but on Win32
 390    platforms we do need a way of distinguishing between the case when we're
 391    compiling a static version of the Prelude and one that's going to be
 392    put into a DLL. Why? Because the compiler's wired in modules need to
 393    be attributed as either coming from a DLL or not.
 394   -}
 395 opt_CompilingPrelude            = lookUp  SLIT("-fcompiling-prelude")
 396 opt_EmitCExternDecls            = lookUp  SLIT("-femit-extern-decls")
 397 opt_EnsureSplittableC           = lookUp  SLIT("-fglobalise-toplev-names")
 398 opt_GranMacros                  = lookUp  SLIT("-fgransim")
 399 opt_HiMap                       = lookup_str "-himap="       -- file saying where to look for .hi files
 400 opt_HiVersion                   = lookup_def_int "-fhi-version=" 0 -- what version we're compiling.
 401 opt_IgnoreAsserts               = lookUp  SLIT("-fignore-asserts")
 402 opt_IgnoreIfacePragmas          = lookUp  SLIT("-fignore-interface-pragmas")
 403 opt_NoHiCheck                   = lookUp  SLIT("-fno-hi-version-check")
 404 opt_NoImplicitPrelude           = lookUp  SLIT("-fno-implicit-prelude")
 405 opt_OmitBlackHoling             = lookUp  SLIT("-dno-black-holing")
 406 opt_OmitInterfacePragmas        = lookUp  SLIT("-fomit-interface-pragmas")
 407 opt_ProduceC                    = lookup_str "-C="
 408 opt_ProduceExportCStubs         = lookup_str "-F="
 409 opt_ProduceExportHStubs         = lookup_str "-FH="
 410 opt_ProduceHi                   = lookup_str "-hifile=" -- the one to produce this time
 411 opt_ProduceS                    = lookup_str "-S="
 412 opt_ReportCompile                = lookUp SLIT("-freport-compile")
 413 opt_PruneTyDecls                = not (lookUp SLIT("-fno-prune-tydecls"))
 414 opt_PruneInstDecls              = not (lookUp SLIT("-fno-prune-instdecls"))
 415 opt_SourceUnchanged             = lookUp  SLIT("-fsource-unchanged")
 416 opt_Static                      = lookUp  SLIT("-static")
 417 opt_Unregisterised              = lookUp  SLIT("-funregisterised")
 418 opt_Verbose                     = lookUp  SLIT("-v")
 419
 420 opt_UseVanillaRegs | opt_Unregisterised = 0
 421                    | otherwise          = mAX_Real_Vanilla_REG
 422 opt_UseFloatRegs   | opt_Unregisterised = 0
 423                    | otherwise          = mAX_Real_Float_REG
 424 opt_UseDoubleRegs  | opt_Unregisterised = 0
 425                    | otherwise          = mAX_Real_Double_REG
 426 opt_UseLongRegs    | opt_Unregisterised = 0
 427                    | otherwise          = mAX_Real_Long_REG
 428
 429 -- opt_UnfoldingOverrideThreshold       = lookup_int "-funfolding-override-threshold"
 430 \end{code}
 431
 432 \begin{code}
 433 classifyOpts :: ([CoreToDo],    -- Core-to-Core processing spec
 434                  [StgToDo])     -- STG-to-STG   processing spec
 435
 436 classifyOpts = sep argv [] [] -- accumulators...
 437   where
 438     sep :: [FAST_STRING]                 -- cmd-line opts (input)
 439         -> [CoreToDo] -> [StgToDo]       -- to_do accumulators
 440         -> ([CoreToDo], [StgToDo])       -- result
 441
 442     sep [] core_td stg_td -- all done!
 443       = (reverse core_td, reverse stg_td)
 444
 445 #       define CORE_TD(to_do) sep opts (to_do:core_td) stg_td
 446 #       define STG_TD(to_do)  sep opts core_td (to_do:stg_td)
 447
 448     sep (opt1:opts) core_td stg_td
 449       = case (_UNPK_ opt1) of -- the non-"just match a string" options are at the end...
 450           ',' : _       -> sep opts core_td stg_td -- it is for the parser
 451
 452           "-fsimplify"  -> -- gather up SimplifierSwitches specially...
 453                            simpl_sep opts defaultSimplSwitches core_td stg_td
 454
 455           "-fcalc-inlinings1"-> CORE_TD(CoreDoCalcInlinings1)
 456           "-fcalc-inlinings2"-> CORE_TD(CoreDoCalcInlinings2)
 457           "-ffloat-inwards"  -> CORE_TD(CoreDoFloatInwards)
 458           "-ffull-laziness"  -> CORE_TD(CoreDoFullLaziness)
 459           "-fliberate-case"  -> CORE_TD(CoreLiberateCase)
 460           "-fprint-core"     -> CORE_TD(CoreDoPrintCore)
 461           "-fstatic-args"    -> CORE_TD(CoreDoStaticArgs)
 462           "-fstrictness"     -> CORE_TD(CoreDoStrictness)
 463           "-fworker-wrapper" -> CORE_TD(CoreDoWorkerWrapper)
 464           "-fspecialise"     -> CORE_TD(CoreDoSpecialising)
 465           "-ffoldr-build-worker-wrapper"  -> CORE_TD(CoreDoFoldrBuildWorkerWrapper)
 466           "-ffoldr-build-ww-anal"  -> CORE_TD(CoreDoFoldrBuildWWAnal)
 467           "-fusagesp"        -> CORE_TD(CoreDoUSPInf)
 468           "-fcpr-analyse"    -> CORE_TD(CoreDoCPResult)
 469
 470           "-fstg-static-args" -> STG_TD(StgDoStaticArgs)
 471           "-fupdate-analysis" -> STG_TD(StgDoUpdateAnalysis)
 472           "-dstg-stats"       -> STG_TD(D_stg_stats)
 473           "-flambda-lift"     -> STG_TD(StgDoLambdaLift)
 474           "-fmassage-stg-for-profiling" -> STG_TD(StgDoMassageForProfiling)
 475
 476           _ -> -- NB: the driver is really supposed to handle bad options
 477                sep opts core_td stg_td
 478
 479     ----------------
 480
 481     simpl_sep :: [FAST_STRING]            -- cmd-line opts (input)
 482               -> [SimplifierSwitch]       -- simplifier-switch accumulator
 483               -> [CoreToDo] -> [StgToDo]  -- to_do accumulators
 484               -> ([CoreToDo], [StgToDo])  -- result
 485
 486         -- "simpl_sep" tailcalls "sep" once it's seen one set
 487         -- of SimplifierSwitches for a CoreDoSimplify.
 488
 489 #ifdef DEBUG
 490     simpl_sep input@[] simpl_sw core_td stg_td
 491       = panic "simpl_sep []"
 492 #endif
 493
 494         -- The SimplifierSwitches should be delimited by "[" and "]".
 495
 496     simpl_sep (opt1:opts) simpl_sw core_td stg_td
 497       = case (_UNPK_ opt1) of
 498           "[" -> simpl_sep opts simpl_sw core_td stg_td
 499           "]" -> let
 500                     this_simpl = CoreDoSimplify (isAmongSimpl simpl_sw)
 501                  in
 502                  sep opts (this_simpl : core_td) stg_td
 503
 504 #         define SIMPL_SW(sw) simpl_sep opts (sw:simpl_sw) core_td stg_td
 505
 506           -- the non-"just match a string" options are at the end...
 507           "-fcode-duplication-ok"           -> SIMPL_SW(SimplOkToDupCode)
 508           "-ffloat-lets-exposing-whnf"      -> SIMPL_SW(SimplFloatLetsExposingWHNF)
 509           "-ffloat-primops-ok"              -> SIMPL_SW(SimplOkToFloatPrimOps)
 510           "-falways-float-lets-from-lets"   -> SIMPL_SW(SimplAlwaysFloatLetsFromLets)
 511           "-fdo-case-elim"                  -> SIMPL_SW(SimplDoCaseElim)
 512           "-fdo-lambda-eta-expansion"       -> SIMPL_SW(SimplDoLambdaEtaExpansion)
 513           "-fdo-foldr-build"                -> SIMPL_SW(SimplDoFoldrBuild)
 514           "-fdo-arity-expand"               -> SIMPL_SW(SimplDoArityExpand)
 515           "-fdo-inline-foldr-build"         -> SIMPL_SW(SimplDoInlineFoldrBuild)
 516           "-fcase-of-case"                  -> SIMPL_SW(SimplCaseOfCase)
 517           "-fcase-merge"                    -> SIMPL_SW(SimplCaseMerge)
 518           "-flet-to-case"                   -> SIMPL_SW(SimplLetToCase)
 519           "-fpedantic-bottoms"              -> SIMPL_SW(SimplPedanticBottoms)
 520           "-fmay-delete-conjurable-ids"     -> SIMPL_SW(SimplMayDeleteConjurableIds)
 521           "-fessential-unfoldings-only"     -> SIMPL_SW(EssentialUnfoldingsOnly)
 522           "-fignore-inline-pragma"          -> SIMPL_SW(IgnoreINLINEPragma)
 523           "-fno-let-from-case"              -> SIMPL_SW(SimplNoLetFromCase)
 524           "-fno-let-from-app"               -> SIMPL_SW(SimplNoLetFromApp)
 525           "-fno-let-from-strict-let"        -> SIMPL_SW(SimplNoLetFromStrictLet)
 526           "-fclone-binds"                   -> SIMPL_SW(SimplPleaseClone)
 527
 528           o | starts_with_msi  -> SIMPL_SW(MaxSimplifierIterations (read after_msi))
 529            where
 530             maybe_msi           = startsWith "-fmax-simplifier-iterations"   o
 531             starts_with_msi     = maybeToBool maybe_msi
 532             (Just after_msi)    = maybe_msi
 533
 534           _ -> -- NB: the driver is really supposed to handle bad options
 535                simpl_sep opts simpl_sw core_td stg_td
 536 \end{code}
 537
 538 %************************************************************************
 539 %*                                                                      *
 540 \subsection{Switch ordering}
 541 %*                                                                      *
 542 %************************************************************************
 543
 544 In spite of the @Produce*@ and @SccGroup@ constructors, these things
 545 behave just like enumeration types.
 546
 547 \begin{code}
 548 instance Eq SimplifierSwitch where
 549     a == b = tagOf_SimplSwitch a _EQ_ tagOf_SimplSwitch b
 550
 551 instance Ord SimplifierSwitch where
 552     a <  b  = tagOf_SimplSwitch a _LT_ tagOf_SimplSwitch b
 553     a <= b  = tagOf_SimplSwitch a _LE_ tagOf_SimplSwitch b
 554
 555 tagOf_SimplSwitch SimplOkToDupCode              =(ILIT(0) :: FAST_INT)
 556 tagOf_SimplSwitch SimplFloatLetsExposingWHNF    = ILIT(1)
 557 tagOf_SimplSwitch SimplOkToFloatPrimOps         = ILIT(2)
 558 tagOf_SimplSwitch SimplAlwaysFloatLetsFromLets  = ILIT(3)
 559 tagOf_SimplSwitch SimplDoCaseElim               = ILIT(4)
 560 tagOf_SimplSwitch SimplCaseOfCase               = ILIT(6)
 561 tagOf_SimplSwitch SimplLetToCase                = ILIT(7)
 562 tagOf_SimplSwitch SimplMayDeleteConjurableIds   = ILIT(9)
 563 tagOf_SimplSwitch SimplPedanticBottoms          = ILIT(10)
 564 tagOf_SimplSwitch SimplDoArityExpand            = ILIT(11)
 565 tagOf_SimplSwitch SimplDoFoldrBuild             = ILIT(12)
 566 tagOf_SimplSwitch SimplDoInlineFoldrBuild       = ILIT(14)
 567 tagOf_SimplSwitch IgnoreINLINEPragma            = ILIT(15)
 568 tagOf_SimplSwitch SimplDoLambdaEtaExpansion     = ILIT(16)
 569 tagOf_SimplSwitch EssentialUnfoldingsOnly       = ILIT(19)
 570 tagOf_SimplSwitch (MaxSimplifierIterations _)   = ILIT(21)
 571 tagOf_SimplSwitch SimplNoLetFromCase            = ILIT(27)
 572 tagOf_SimplSwitch SimplNoLetFromApp             = ILIT(28)
 573 tagOf_SimplSwitch SimplNoLetFromStrictLet       = ILIT(29)
 574 tagOf_SimplSwitch SimplCaseMerge                = ILIT(31)
 575 tagOf_SimplSwitch SimplPleaseClone              = ILIT(32)
 576
 577 -- If you add anything here, be sure to change lAST_SIMPL_SWITCH_TAG, too!
 578
 579 tagOf_SimplSwitch _ = panic# "tagOf_SimplSwitch"
 580
 581 lAST_SIMPL_SWITCH_TAG = IBOX(tagOf_SimplSwitch SimplPleaseClone)
 582 \end{code}
 583
 584 %************************************************************************
 585 %*                                                                      *
 586 \subsection{Switch lookup}
 587 %*                                                                      *
 588 %************************************************************************
 589
 590 \begin{code}
 591 isAmongSimpl :: [SimplifierSwitch] -> SimplifierSwitch -> SwitchResult
 592
 593 isAmongSimpl on_switches                -- Switches mentioned later occur *earlier*
 594                                         -- in the list; defaults right at the end.
 595   = let
 596         tidied_on_switches = foldl rm_dups [] on_switches
 597                 -- The fold*l* ensures that we keep the latest switches;
 598                 -- ie the ones that occur earliest in the list.
 599
 600         sw_tbl :: Array Int SwitchResult
 601
 602         sw_tbl = (array (0, lAST_SIMPL_SWITCH_TAG) -- bounds...
 603                         all_undefined)
 604                  // defined_elems
 605
 606         all_undefined = [ (i, SwBool False) | i <- [0 .. lAST_SIMPL_SWITCH_TAG ] ]
 607
 608         defined_elems = map mk_assoc_elem tidied_on_switches
 609     in
 610     -- (avoid some unboxing, bounds checking, and other horrible things:)
 611     case sw_tbl of { Array bounds_who_needs_'em stuff ->
 612     \ switch ->
 613         case (indexArray# stuff (tagOf_SimplSwitch switch)) of
 614 #if __GLASGOW_HASKELL__ < 400
 615           Lift v -> v
 616 #elif __GLASGOW_HASKELL__ < 403
 617           (# _, v #) -> v
 618 #else
 619           (# v #) -> v
 620 #endif
 621     }
 622   where
 623     mk_assoc_elem k@(MaxSimplifierIterations lvl)       = (IBOX(tagOf_SimplSwitch k), SwInt lvl)
 624
 625     mk_assoc_elem k = (IBOX(tagOf_SimplSwitch k), SwBool True) -- I'm here, Mom!
 626
 627     -- cannot have duplicates if we are going to use the array thing
 628     rm_dups switches_so_far switch
 629       = if switch `is_elem` switches_so_far
 630         then switches_so_far
 631         else switch : switches_so_far
 632       where
 633         sw `is_elem` []     = False
 634         sw `is_elem` (s:ss) = (tagOf_SimplSwitch sw) _EQ_ (tagOf_SimplSwitch s)
 635                             || sw `is_elem` ss
 636 \end{code}
 637
 638 Default settings for simplifier switches
 639
 640 \begin{code}
 641 defaultSimplSwitches = [MaxSimplifierIterations         1
 642                        ]
 643 \end{code}
 644
 645 %************************************************************************
 646 %*                                                                      *
 647 \subsection{Misc functions for command-line options}
 648 %*                                                                      *
 649 %************************************************************************
 650
 651
 652 \begin{code}
 653 switchIsOn :: (switch -> SwitchResult) -> switch -> Bool
 654
 655 switchIsOn lookup_fn switch
 656   = case (lookup_fn switch) of
 657       SwBool False -> False
 658       _            -> True
 659
 660 intSwitchSet :: (switch -> SwitchResult)
 661              -> (Int -> switch)
 662              -> Maybe Int
 663
 664 intSwitchSet lookup_fn switch
 665   = case (lookup_fn (switch (panic "intSwitchSet"))) of
 666       SwInt int -> Just int
 667       _         -> Nothing
 668 \end{code}
 669
 670 \begin{code}
 671 startsWith, endsWith :: String -> String -> Maybe String
 672
 673 startsWith []     str = Just str
 674 startsWith (c:cs) (s:ss)
 675   = if c /= s then Nothing else startsWith cs ss
 676 startsWith  _     []  = Nothing
 677
 678 endsWith cs ss
 679   = case (startsWith (reverse cs) (reverse ss)) of
 680       Nothing -> Nothing
 681       Just rs -> Just (reverse rs)
 682 \end{code}