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