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