ghc/compiler/main/CmdLineOpts.lhs

   1 %
   2 % (c) The University of Glasgow, 1996-2000
   3 %
   4 \section[CmdLineOpts]{Things to do with command-line options}
   5
   6 \begin{code}
   7
   8 module CmdLineOpts (
   9         CoreToDo(..),
  10         SimplifierSwitch(..), isAmongSimpl,
  11         StgToDo(..),
  12         SwitchResult(..),
  13
  14         HscLang(..),
  15         DynFlag(..),    -- needed non-abstractly by DriverFlags
  16         DynFlags(..),
  17         defaultDynFlags,
  18
  19         v_Static_hsc_opts,
  20
  21         intSwitchSet,
  22         switchIsOn,
  23         isStaticHscFlag,
  24
  25         opt_PprStyle_NoPrags,
  26         opt_PprStyle_RawTypes,
  27         opt_PprUserLength,
  28         opt_PprStyle_Debug,
  29
  30         dopt,
  31
  32         -- other dynamic flags
  33         dopt_CoreToDo,
  34         dopt_StgToDo,
  35         dopt_HscLang,
  36         dopt_OutName,
  37
  38         -- profiling opts
  39         opt_AutoSccsOnAllToplevs,
  40         opt_AutoSccsOnExportedToplevs,
  41         opt_AutoSccsOnIndividualCafs,
  42         opt_AutoSccsOnDicts,
  43         opt_SccProfilingOn,
  44         opt_DoTickyProfiling,
  45
  46         -- language opts
  47         opt_AllStrict,
  48         opt_DictsStrict,
  49         opt_MaxContextReductionDepth,
  50         opt_IrrefutableTuples,
  51         opt_NumbersStrict,
  52         opt_Parallel,
  53         opt_SMP,
  54         opt_NoMonomorphismRestriction,
  55
  56         -- optimisation opts
  57         opt_DoSemiTagging,
  58         opt_FoldrBuildOn,
  59         opt_LiberateCaseThreshold,
  60         opt_StgDoLetNoEscapes,
  61         opt_UnfoldCasms,
  62         opt_UsageSPOn,
  63         opt_UnboxStrictFields,
  64         opt_SimplNoPreInlining,
  65         opt_SimplDoEtaReduction,
  66         opt_SimplDoLambdaEtaExpansion,
  67         opt_SimplCaseOfCase,
  68         opt_SimplCaseMerge,
  69         opt_SimplPedanticBottoms,
  70         opt_SimplExcessPrecision,
  71
  72         -- Unfolding control
  73         opt_UF_HiFileThreshold,
  74         opt_UF_CreationThreshold,
  75         opt_UF_UseThreshold,
  76         opt_UF_FunAppDiscount,
  77         opt_UF_KeenessFactor,
  78         opt_UF_UpdateInPlace,
  79         opt_UF_CheapOp,
  80         opt_UF_DearOp,
  81
  82         -- misc opts
  83         opt_InPackage,
  84         opt_EmitCExternDecls,
  85         opt_EnsureSplittableC,
  86         opt_GranMacros,
  87         opt_HiVersion,
  88         opt_HistorySize,
  89         opt_IgnoreAsserts,
  90         opt_IgnoreIfacePragmas,
  91         opt_NoHiCheck,
  92         opt_OmitBlackHoling,
  93         opt_OmitInterfacePragmas,
  94         opt_NoPruneTyDecls,
  95         opt_NoPruneDecls,
  96         opt_Static,
  97         opt_Unregisterised
  98     ) where
  99
 100 #include "HsVersions.h"
 101
 102 import Array    ( array, (//) )
 103 import GlaExts
 104 import IOExts   ( IORef, readIORef )
 105 import Constants        -- Default values for some flags
 106 import Util
 107 import FastTypes
 108 import Config
 109
 110 import Maybes           ( firstJust )
 111 import Panic            ( panic )
 112
 113 #if __GLASGOW_HASKELL__ < 301
 114 import ArrBase  ( Array(..) )
 115 #else
 116 import PrelArr  ( Array(..) )
 117 #endif
 118 \end{code}
 119
 120 %************************************************************************
 121 %*                                                                      *
 122 \subsection{Command-line options}
 123 %*                                                                      *
 124 %************************************************************************
 125
 126 The hsc command-line options are split into two categories:
 127
 128   - static flags
 129   - dynamic flags
 130
 131 Static flags are represented by top-level values of type Bool or Int,
 132 for example.  They therefore have the same value throughout the
 133 invocation of hsc.
 134
 135 Dynamic flags are represented by an abstract type, DynFlags, which is
 136 passed into hsc by the compilation manager for every compilation.
 137 Dynamic flags are those that change on a per-compilation basis,
 138 perhaps because they may be present in the OPTIONS pragma at the top
 139 of a module.
 140
 141 Other flag-related blurb:
 142
 143 A list of {\em ToDo}s is things to be done in a particular part of
 144 processing.  A (fictitious) example for the Core-to-Core simplifier
 145 might be: run the simplifier, then run the strictness analyser, then
 146 run the simplifier again (three ``todos'').
 147
 148 There are three ``to-do processing centers'' at the moment.  In the
 149 main loop (\tr{main/Main.lhs}), in the Core-to-Core processing loop
 150 (\tr{simplCore/SimplCore.lhs), and in the STG-to-STG processing loop
 151 (\tr{simplStg/SimplStg.lhs}).
 152
 153 %************************************************************************
 154 %*                                                                      *
 155 \subsection{Datatypes associated with command-line options}
 156 %*                                                                      *
 157 %************************************************************************
 158
 159 \begin{code}
 160 data SwitchResult
 161   = SwBool      Bool            -- on/off
 162   | SwString    FAST_STRING     -- nothing or a String
 163   | SwInt       Int             -- nothing or an Int
 164 \end{code}
 165
 166 \begin{code}
 167 data CoreToDo           -- These are diff core-to-core passes,
 168                         -- which may be invoked in any order,
 169                         -- as many times as you like.
 170
 171   = CoreDoSimplify      -- The core-to-core simplifier.
 172         (SimplifierSwitch -> SwitchResult)
 173                         -- Each run of the simplifier can take a different
 174                         -- set of simplifier-specific flags.
 175   | CoreDoFloatInwards
 176   | CoreDoFloatOutwards Bool    -- True <=> float lambdas to top level
 177   | CoreLiberateCase
 178   | CoreDoPrintCore
 179   | CoreDoStaticArgs
 180   | CoreDoStrictness
 181   | CoreDoWorkerWrapper
 182   | CoreDoSpecialising
 183   | CoreDoUSPInf
 184   | CoreDoCPResult
 185   | CoreDoGlomBinds
 186   | CoreCSE
 187
 188   | CoreDoNothing        -- useful when building up lists of these things
 189 \end{code}
 190
 191 \begin{code}
 192 data StgToDo
 193   = StgDoMassageForProfiling  -- should be (next to) last
 194   -- There's also setStgVarInfo, but its absolute "lastness"
 195   -- is so critical that it is hardwired in (no flag).
 196   | D_stg_stats
 197 \end{code}
 198
 199 \begin{code}
 200 data SimplifierSwitch
 201   = MaxSimplifierIterations Int
 202   | SimplInlinePhase Int
 203   | DontApplyRules
 204   | NoCaseOfCase
 205   | SimplLetToCase
 206 \end{code}
 207
 208 %************************************************************************
 209 %*                                                                      *
 210 \subsection{Dynamic command-line options}
 211 %*                                                                      *
 212 %************************************************************************
 213
 214 \begin{code}
 215 data DynFlag
 216
 217    -- debugging flags
 218    = Opt_D_dump_absC
 219    | Opt_D_dump_asm
 220    | Opt_D_dump_cpranal
 221    | Opt_D_dump_deriv
 222    | Opt_D_dump_ds
 223    | Opt_D_dump_flatC
 224    | Opt_D_dump_foreign
 225    | Opt_D_dump_inlinings
 226    | Opt_D_dump_occur_anal
 227    | Opt_D_dump_parsed
 228    | Opt_D_dump_realC
 229    | Opt_D_dump_rn
 230    | Opt_D_dump_simpl
 231    | Opt_D_dump_simpl_iterations
 232    | Opt_D_dump_spec
 233    | Opt_D_dump_sat
 234    | Opt_D_dump_stg
 235    | Opt_D_dump_stranal
 236    | Opt_D_dump_tc
 237    | Opt_D_dump_types
 238    | Opt_D_dump_rules
 239    | Opt_D_dump_usagesp
 240    | Opt_D_dump_cse
 241    | Opt_D_dump_worker_wrapper
 242    | Opt_D_dump_rn_trace
 243    | Opt_D_dump_rn_stats
 244    | Opt_D_dump_stix
 245    | Opt_D_dump_simpl_stats
 246    | Opt_D_dump_InterpSyn
 247    | Opt_D_dump_BCOs
 248    | Opt_D_source_stats
 249    | Opt_D_verbose_core2core
 250    | Opt_D_verbose_stg2stg
 251    | Opt_D_dump_hi
 252    | Opt_D_dump_hi_diffs
 253    | Opt_D_dump_minimal_imports
 254    | Opt_DoCoreLinting
 255    | Opt_DoStgLinting
 256    | Opt_DoUSPLinting
 257
 258    | Opt_WarnDuplicateExports
 259    | Opt_WarnHiShadows
 260    | Opt_WarnIncompletePatterns
 261    | Opt_WarnMissingFields
 262    | Opt_WarnMissingMethods
 263    | Opt_WarnMissingSigs
 264    | Opt_WarnNameShadowing
 265    | Opt_WarnOverlappingPatterns
 266    | Opt_WarnSimplePatterns
 267    | Opt_WarnTypeDefaults
 268    | Opt_WarnUnusedBinds
 269    | Opt_WarnUnusedImports
 270    | Opt_WarnUnusedMatches
 271    | Opt_WarnDeprecations
 272
 273    -- language opts
 274    | Opt_AllowOverlappingInstances
 275    | Opt_AllowUndecidableInstances
 276    | Opt_GlasgowExts
 277    | Opt_Generics
 278    | Opt_NoImplicitPrelude
 279
 280    -- misc
 281    | Opt_ReportCompile
 282    deriving (Eq)
 283
 284 data DynFlags = DynFlags {
 285   coreToDo   :: [CoreToDo],
 286   stgToDo    :: [StgToDo],
 287   hscLang    :: HscLang,
 288   hscOutName :: String,  -- name of the file in which to place output
 289   verbosity  :: Int,     -- verbosity level
 290   flags      :: [DynFlag]
 291  }
 292
 293 defaultDynFlags = DynFlags {
 294   coreToDo = [], stgToDo = [],
 295   hscLang = HscC, hscOutName = "",
 296   verbosity = 0, flags = []
 297   }
 298
 299 {-
 300     Verbosity levels:
 301
 302     0   |   print errors & warnings only
 303     1   |   minimal verbosity: print "compiling M ... done." for each module.
 304     2   |   equivalent to -dshow-passes
 305     3   |   equivalent to existing "ghc -v"
 306     4   |   "ghc -v -ddump-most"
 307     5   |   "ghc -v -ddump-all"
 308 -}
 309
 310 dopt :: DynFlag -> DynFlags -> Bool
 311 dopt f dflags  = f `elem` (flags dflags)
 312
 313 dopt_CoreToDo :: DynFlags -> [CoreToDo]
 314 dopt_CoreToDo = coreToDo
 315
 316 dopt_StgToDo :: DynFlags -> [StgToDo]
 317 dopt_StgToDo = stgToDo
 318
 319 dopt_OutName :: DynFlags -> String
 320 dopt_OutName = hscOutName
 321
 322 data HscLang
 323   = HscC
 324   | HscAsm
 325   | HscJava
 326   | HscInterpreted
 327     deriving (Eq, Show)
 328
 329 dopt_HscLang :: DynFlags -> HscLang
 330 dopt_HscLang = hscLang
 331 \end{code}
 332
 333 %************************************************************************
 334 %*                                                                      *
 335 \subsection{Classifying command-line options}
 336 %*                                                                      *
 337 %************************************************************************
 338
 339 \begin{code}
 340 -- v_Statis_hsc_opts is here to avoid a circular dependency with
 341 -- main/DriverState.
 342 GLOBAL_VAR(v_Static_hsc_opts, [], [String])
 343
 344 lookUp           :: FAST_STRING -> Bool
 345 lookup_int       :: String -> Maybe Int
 346 lookup_def_int   :: String -> Int -> Int
 347 lookup_def_float :: String -> Float -> Float
 348 lookup_str       :: String -> Maybe String
 349
 350 unpacked_static_opts = unsafePerformIO (readIORef v_Static_hsc_opts)
 351 packed_static_opts   = map _PK_ unpacked_static_opts
 352
 353 lookUp     sw = sw `elem` packed_static_opts
 354
 355 lookup_str sw = firstJust (map (startsWith sw) unpacked_static_opts)
 356
 357 lookup_int sw = case (lookup_str sw) of
 358                   Nothing -> Nothing
 359                   Just xx -> Just (read xx)
 360
 361 lookup_def_int sw def = case (lookup_str sw) of
 362                             Nothing -> def              -- Use default
 363                             Just xx -> read xx
 364
 365 lookup_def_float sw def = case (lookup_str sw) of
 366                             Nothing -> def              -- Use default
 367                             Just xx -> read xx
 368
 369
 370 {-
 371  Putting the compiler options into temporary at-files
 372  may turn out to be necessary later on if we turn hsc into
 373  a pure Win32 application where I think there's a command-line
 374  length limit of 255. unpacked_opts understands the @ option.
 375
 376 unpacked_opts :: [String]
 377 unpacked_opts =
 378   concat $
 379   map (expandAts) $
 380   map _UNPK_ argv  -- NOT ARGV any more: v_Static_hsc_opts
 381   where
 382    expandAts ('@':fname) = words (unsafePerformIO (readFile fname))
 383    expandAts l = [l]
 384 -}
 385 \end{code}
 386
 387 %************************************************************************
 388 %*                                                                      *
 389 \subsection{Static options}
 390 %*                                                                      *
 391 %************************************************************************
 392
 393 \begin{code}
 394 -- debugging opts
 395 opt_PprStyle_NoPrags            = lookUp  SLIT("-dppr-noprags")
 396 opt_PprStyle_Debug              = lookUp  SLIT("-dppr-debug")
 397 opt_PprStyle_RawTypes           = lookUp  SLIT("-dppr-rawtypes")
 398 opt_PprUserLength               = lookup_def_int "-dppr-user-length" 5 --ToDo: give this a name
 399
 400 -- profiling opts
 401 opt_AutoSccsOnAllToplevs        = lookUp  SLIT("-fauto-sccs-on-all-toplevs")
 402 opt_AutoSccsOnExportedToplevs   = lookUp  SLIT("-fauto-sccs-on-exported-toplevs")
 403 opt_AutoSccsOnIndividualCafs    = lookUp  SLIT("-fauto-sccs-on-individual-cafs")
 404 opt_AutoSccsOnDicts             = lookUp  SLIT("-fauto-sccs-on-dicts")
 405 opt_SccProfilingOn              = lookUp  SLIT("-fscc-profiling")
 406 opt_DoTickyProfiling            = lookUp  SLIT("-fticky-ticky")
 407
 408 -- language opts
 409 opt_AllStrict                   = lookUp  SLIT("-fall-strict")
 410 opt_NoMonomorphismRestriction   = lookUp  SLIT("-fno-monomorphism-restriction")
 411 opt_DictsStrict                 = lookUp  SLIT("-fdicts-strict")
 412 opt_IrrefutableTuples           = lookUp  SLIT("-firrefutable-tuples")
 413 opt_MaxContextReductionDepth    = lookup_def_int "-fcontext-stack" mAX_CONTEXT_REDUCTION_DEPTH
 414 opt_NumbersStrict               = lookUp  SLIT("-fnumbers-strict")
 415 opt_Parallel                    = lookUp  SLIT("-fparallel")
 416 opt_SMP                         = lookUp  SLIT("-fsmp")
 417
 418 -- optimisation opts
 419 opt_DoSemiTagging               = lookUp  SLIT("-fsemi-tagging")
 420 opt_FoldrBuildOn                = lookUp  SLIT("-ffoldr-build-on")
 421 opt_LiberateCaseThreshold       = lookup_def_int "-fliberate-case-threshold" (10::Int)
 422 opt_StgDoLetNoEscapes           = lookUp  SLIT("-flet-no-escape")
 423 opt_UnfoldCasms                 = lookUp SLIT("-funfold-casms-in-hi-file")
 424 opt_UsageSPOn                   = lookUp  SLIT("-fusagesp-on")
 425 opt_UnboxStrictFields           = lookUp  SLIT("-funbox-strict-fields")
 426
 427 {-
 428    The optional '-inpackage=P' flag tells what package
 429    we are compiling this module for.
 430    The Prelude, for example is compiled with '-package prelude'
 431 -}
 432 opt_InPackage                   = case lookup_str "-inpackage=" of
 433                                     Just p  -> _PK_ p
 434                                     Nothing -> SLIT("Main")     -- The package name if none is specified
 435
 436 opt_EmitCExternDecls            = lookUp  SLIT("-femit-extern-decls")
 437 opt_EnsureSplittableC           = lookUp  SLIT("-fglobalise-toplev-names")
 438 opt_GranMacros                  = lookUp  SLIT("-fgransim")
 439 opt_HiVersion                   = read cProjectVersionInt :: Int
 440 opt_HistorySize                 = lookup_def_int "-fhistory-size" 20
 441 opt_IgnoreAsserts               = lookUp  SLIT("-fignore-asserts")
 442 opt_IgnoreIfacePragmas          = lookUp  SLIT("-fignore-interface-pragmas")
 443 opt_NoHiCheck                   = lookUp  SLIT("-fno-hi-version-check")
 444 opt_OmitBlackHoling             = lookUp  SLIT("-dno-black-holing")
 445 opt_OmitInterfacePragmas        = lookUp  SLIT("-fomit-interface-pragmas")
 446
 447 -- Simplifier switches
 448 opt_SimplNoPreInlining          = lookUp SLIT("-fno-pre-inlining")
 449         -- NoPreInlining is there just to see how bad things
 450         -- get if you don't do it!
 451 opt_SimplDoEtaReduction         = lookUp SLIT("-fdo-eta-reduction")
 452 opt_SimplDoLambdaEtaExpansion   = lookUp SLIT("-fdo-lambda-eta-expansion")
 453 opt_SimplCaseOfCase             = lookUp SLIT("-fcase-of-case")
 454 opt_SimplCaseMerge              = lookUp SLIT("-fcase-merge")
 455 opt_SimplPedanticBottoms        = lookUp SLIT("-fpedantic-bottoms")
 456 opt_SimplExcessPrecision        = lookUp SLIT("-fexcess-precision")
 457
 458 -- Unfolding control
 459 opt_UF_HiFileThreshold          = lookup_def_int "-funfolding-interface-threshold" (45::Int)
 460 opt_UF_CreationThreshold        = lookup_def_int "-funfolding-creation-threshold"  (45::Int)
 461 opt_UF_UseThreshold             = lookup_def_int "-funfolding-use-threshold"       (8::Int)     -- Discounts can be big
 462 opt_UF_FunAppDiscount           = lookup_def_int "-funfolding-fun-discount"        (6::Int)     -- It's great to inline a fn
 463 opt_UF_KeenessFactor            = lookup_def_float "-funfolding-keeness-factor"    (1.5::Float)
 464 opt_UF_UpdateInPlace            = lookUp  SLIT("-funfolding-update-in-place")
 465
 466 opt_UF_CheapOp  = ( 1 :: Int)   -- Only one instruction; and the args are charged for
 467 opt_UF_DearOp   = ( 4 :: Int)
 468
 469 opt_NoPruneDecls                = lookUp SLIT("-fno-prune-decls")
 470 opt_NoPruneTyDecls              = lookUp SLIT("-fno-prune-tydecls")
 471 opt_Static                      = lookUp SLIT("-static")
 472 opt_Unregisterised              = lookUp SLIT("-funregisterised")
 473 \end{code}
 474
 475 %************************************************************************
 476 %*                                                                      *
 477 \subsection{List of static hsc flags}
 478 %*                                                                      *
 479 %************************************************************************
 480
 481 \begin{code}
 482 isStaticHscFlag f =
 483   f `elem` [
 484         "fauto-sccs-on-all-toplevs",
 485         "fauto-sccs-on-exported-toplevs",
 486         "fauto-sccs-on-individual-cafs",
 487         "fauto-sccs-on-dicts",
 488         "fscc-profiling",
 489         "fticky-ticky",
 490         "fall-strict",
 491         "fdicts-strict",
 492         "firrefutable-tuples",
 493         "fnumbers-strict",
 494         "fparallel",
 495         "fsmp",
 496         "fsemi-tagging",
 497         "ffoldr-build-on",
 498         "flet-no-escape",
 499         "funfold-casms-in-hi-file",
 500         "fusagesp-on",
 501         "funbox-strict-fields",
 502         "femit-extern-decls",
 503         "fglobalise-toplev-names",
 504         "fgransim",
 505         "fignore-asserts",
 506         "fignore-interface-pragmas",
 507         "fno-hi-version-check",
 508         "dno-black-holing",
 509         "fomit-interface-pragmas",
 510         "fno-pre-inlining",
 511         "fdo-eta-reduction",
 512         "fdo-lambda-eta-expansion",
 513         "fcase-of-case",
 514         "fcase-merge",
 515         "fpedantic-bottoms",
 516         "fexcess-precision",
 517         "funfolding-update-in-place",
 518         "freport-compile",
 519         "fno-prune-decls",
 520         "fno-prune-tydecls",
 521         "static",
 522         "funregisterised"
 523         ]
 524   || any (flip prefixMatch f) [
 525         "fcontext-stack",
 526         "fliberate-case-threshold",
 527         "fhistory-size",
 528         "funfolding-interface-threshold",
 529         "funfolding-creation-threshold",
 530         "funfolding-use-threshold",
 531         "funfolding-fun-discount",
 532         "funfolding-keeness-factor"
 533      ]
 534 \end{code}
 535
 536 %************************************************************************
 537 %*                                                                      *
 538 \subsection{Switch ordering}
 539 %*                                                                      *
 540 %************************************************************************
 541
 542 These things behave just like enumeration types.
 543
 544 \begin{code}
 545 instance Eq SimplifierSwitch where
 546     a == b = tagOf_SimplSwitch a ==# tagOf_SimplSwitch b
 547
 548 instance Ord SimplifierSwitch where
 549     a <  b  = tagOf_SimplSwitch a <# tagOf_SimplSwitch b
 550     a <= b  = tagOf_SimplSwitch a <=# tagOf_SimplSwitch b
 551
 552
 553 tagOf_SimplSwitch (SimplInlinePhase _)          = _ILIT(1)
 554 tagOf_SimplSwitch (MaxSimplifierIterations _)   = _ILIT(2)
 555 tagOf_SimplSwitch DontApplyRules                = _ILIT(3)
 556 tagOf_SimplSwitch SimplLetToCase                = _ILIT(4)
 557 tagOf_SimplSwitch NoCaseOfCase                  = _ILIT(5)
 558
 559 -- If you add anything here, be sure to change lAST_SIMPL_SWITCH_TAG, too!
 560
 561 lAST_SIMPL_SWITCH_TAG = 5
 562 \end{code}
 563
 564 %************************************************************************
 565 %*                                                                      *
 566 \subsection{Switch lookup}
 567 %*                                                                      *
 568 %************************************************************************
 569
 570 \begin{code}
 571 isAmongSimpl :: [SimplifierSwitch] -> SimplifierSwitch -> SwitchResult
 572 isAmongSimpl on_switches                -- Switches mentioned later occur *earlier*
 573                                         -- in the list; defaults right at the end.
 574   = let
 575         tidied_on_switches = foldl rm_dups [] on_switches
 576                 -- The fold*l* ensures that we keep the latest switches;
 577                 -- ie the ones that occur earliest in the list.
 578
 579         sw_tbl :: Array Int SwitchResult
 580         sw_tbl = (array (0, lAST_SIMPL_SWITCH_TAG) -- bounds...
 581                         all_undefined)
 582                  // defined_elems
 583
 584         all_undefined = [ (i, SwBool False) | i <- [0 .. lAST_SIMPL_SWITCH_TAG ] ]
 585
 586         defined_elems = map mk_assoc_elem tidied_on_switches
 587     in
 588     -- (avoid some unboxing, bounds checking, and other horrible things:)
 589 #if __GLASGOW_HASKELL__ < 405
 590     case sw_tbl of { Array bounds_who_needs_'em stuff ->
 591 #else
 592     case sw_tbl of { Array _ _ stuff ->
 593 #endif
 594     \ switch ->
 595         case (indexArray# stuff (tagOf_SimplSwitch switch)) of
 596 #if __GLASGOW_HASKELL__ < 400
 597           Lift v -> v
 598 #elif __GLASGOW_HASKELL__ < 403
 599           (# _, v #) -> v
 600 #else
 601           (# v #) -> v
 602 #endif
 603     }
 604   where
 605     mk_assoc_elem k@(MaxSimplifierIterations lvl)
 606         = (iBox (tagOf_SimplSwitch k), SwInt lvl)
 607     mk_assoc_elem k@(SimplInlinePhase n)
 608         = (iBox (tagOf_SimplSwitch k), SwInt n)
 609     mk_assoc_elem k
 610         = (iBox (tagOf_SimplSwitch k), SwBool True) -- I'm here, Mom!
 611
 612     -- cannot have duplicates if we are going to use the array thing
 613     rm_dups switches_so_far switch
 614       = if switch `is_elem` switches_so_far
 615         then switches_so_far
 616         else switch : switches_so_far
 617       where
 618         sw `is_elem` []     = False
 619         sw `is_elem` (s:ss) = (tagOf_SimplSwitch sw) ==# (tagOf_SimplSwitch s)
 620                             || sw `is_elem` ss
 621 \end{code}
 622
 623
 624 %************************************************************************
 625 %*                                                                      *
 626 \subsection{Misc functions for command-line options}
 627 %*                                                                      *
 628 %************************************************************************
 629
 630
 631 \begin{code}
 632 switchIsOn :: (switch -> SwitchResult) -> switch -> Bool
 633
 634 switchIsOn lookup_fn switch
 635   = case (lookup_fn switch) of
 636       SwBool False -> False
 637       _            -> True
 638
 639 intSwitchSet :: (switch -> SwitchResult)
 640              -> (Int -> switch)
 641              -> Maybe Int
 642
 643 intSwitchSet lookup_fn switch
 644   = case (lookup_fn (switch (panic "intSwitchSet"))) of
 645       SwInt int -> Just int
 646       _         -> Nothing
 647 \end{code}
 648
 649 \begin{code}
 650 startsWith :: String -> String -> Maybe String
 651 -- startsWith pfx (pfx++rest) = Just rest
 652
 653 startsWith []     str = Just str
 654 startsWith (c:cs) (s:ss)
 655   = if c /= s then Nothing else startsWith cs ss
 656 startsWith  _     []  = Nothing
 657
 658 endsWith  :: String -> String -> Maybe String
 659 endsWith cs ss
 660   = case (startsWith (reverse cs) (reverse ss)) of
 661       Nothing -> Nothing
 662       Just rs -> Just (reverse rs)
 663 \end{code}