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