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(..), StgToDo(..),
  10         SimplifierSwitch(..),
  11         SimplifierMode(..), FloatOutSwitches(..),
  12
  13         HscLang(..),
  14         DynFlag(..),    -- needed non-abstractly by DriverFlags
  15         DynFlags(..),
  16
  17         v_Static_hsc_opts,
  18
  19         isStaticHscFlag,
  20
  21         -- Manipulating DynFlags
  22         defaultDynFlags,                -- DynFlags
  23         dopt,                           -- DynFlag -> DynFlags -> Bool
  24         dopt_set, dopt_unset,           -- DynFlags -> DynFlag -> DynFlags
  25         dopt_CoreToDo,                  -- DynFlags -> [CoreToDo]
  26         dopt_StgToDo,                   -- DynFlags -> [StgToDo]
  27         dopt_HscLang,                   -- DynFlags -> HscLang
  28         dopt_OutName,                   -- DynFlags -> String
  29         getOpts,                        -- (DynFlags -> [a]) -> IO [a]
  30         setLang,
  31         getVerbFlag,
  32
  33         -- Manipulating the DynFlags state
  34         getDynFlags,                    -- IO DynFlags
  35         setDynFlags,                    -- DynFlags -> IO ()
  36         updDynFlags,                    -- (DynFlags -> DynFlags) -> IO ()
  37         dynFlag,                        -- (DynFlags -> a) -> IO a
  38         setDynFlag, unSetDynFlag,       -- DynFlag -> IO ()
  39         saveDynFlags,                   -- IO ()
  40         restoreDynFlags,                -- IO DynFlags
  41
  42         -- sets of warning opts
  43         standardWarnings,
  44         minusWOpts,
  45         minusWallOpts,
  46
  47         -- Output style options
  48         opt_PprStyle_NoPrags,
  49         opt_PprStyle_RawTypes,
  50         opt_PprUserLength,
  51         opt_PprStyle_Debug,
  52
  53         -- profiling opts
  54         opt_AutoSccsOnAllToplevs,
  55         opt_AutoSccsOnExportedToplevs,
  56         opt_AutoSccsOnIndividualCafs,
  57         opt_AutoSccsOnDicts,
  58         opt_SccProfilingOn,
  59         opt_DoTickyProfiling,
  60
  61         -- language opts
  62         opt_AllStrict,
  63         opt_DictsStrict,
  64         opt_MaxContextReductionDepth,
  65         opt_IrrefutableTuples,
  66         opt_NumbersStrict,
  67         opt_Parallel,
  68         opt_SMP,
  69         opt_RuntimeTypes,
  70         opt_Flatten,
  71
  72         -- optimisation opts
  73         opt_NoMethodSharing,
  74         opt_DoSemiTagging,
  75         opt_FoldrBuildOn,
  76         opt_LiberateCaseThreshold,
  77         opt_StgDoLetNoEscapes,
  78         opt_UnfoldCasms,
  79         opt_UsageSPOn,
  80         opt_UnboxStrictFields,
  81         opt_SimplNoPreInlining,
  82         opt_SimplDoEtaReduction,
  83         opt_SimplDoLambdaEtaExpansion,
  84         opt_SimplCaseMerge,
  85         opt_SimplExcessPrecision,
  86         opt_MaxWorkerArgs,
  87
  88         -- Unfolding control
  89         opt_UF_CreationThreshold,
  90         opt_UF_UseThreshold,
  91         opt_UF_FunAppDiscount,
  92         opt_UF_KeenessFactor,
  93         opt_UF_UpdateInPlace,
  94         opt_UF_CheapOp,
  95         opt_UF_DearOp,
  96
  97         -- misc opts
  98         opt_InPackage,
  99         opt_EmitCExternDecls,
 100         opt_EnsureSplittableC,
 101         opt_GranMacros,
 102         opt_HiVersion,
 103         opt_HistorySize,
 104         opt_IgnoreAsserts,
 105         opt_IgnoreIfacePragmas,
 106         opt_NoHiCheck,
 107         opt_OmitBlackHoling,
 108         opt_OmitInterfacePragmas,
 109         opt_NoPruneTyDecls,
 110         opt_NoPruneDecls,
 111         opt_Static,
 112         opt_Unregisterised,
 113         opt_EmitExternalCore
 114     ) where
 115
 116 #include "HsVersions.h"
 117
 118 import GlaExts
 119 import IOExts   ( IORef, readIORef, writeIORef )
 120 import Constants        -- Default values for some flags
 121 import Util
 122 import FastTypes
 123 import FastString       ( FastString, mkFastString )
 124 import Config
 125
 126 import Maybes           ( firstJust )
 127 \end{code}
 128
 129 %************************************************************************
 130 %*                                                                      *
 131 \subsection{Command-line options}
 132 %*                                                                      *
 133 %************************************************************************
 134
 135 The hsc command-line options are split into two categories:
 136
 137   - static flags
 138   - dynamic flags
 139
 140 Static flags are represented by top-level values of type Bool or Int,
 141 for example.  They therefore have the same value throughout the
 142 invocation of hsc.
 143
 144 Dynamic flags are represented by an abstract type, DynFlags, which is
 145 passed into hsc by the compilation manager for every compilation.
 146 Dynamic flags are those that change on a per-compilation basis,
 147 perhaps because they may be present in the OPTIONS pragma at the top
 148 of a module.
 149
 150 Other flag-related blurb:
 151
 152 A list of {\em ToDo}s is things to be done in a particular part of
 153 processing.  A (fictitious) example for the Core-to-Core simplifier
 154 might be: run the simplifier, then run the strictness analyser, then
 155 run the simplifier again (three ``todos'').
 156
 157 There are three ``to-do processing centers'' at the moment.  In the
 158 main loop (\tr{main/Main.lhs}), in the Core-to-Core processing loop
 159 (\tr{simplCore/SimplCore.lhs), and in the STG-to-STG processing loop
 160 (\tr{simplStg/SimplStg.lhs}).
 161
 162 %************************************************************************
 163 %*                                                                      *
 164 \subsection{Datatypes associated with command-line options}
 165 %*                                                                      *
 166 %************************************************************************
 167
 168 \begin{code}
 169 data CoreToDo           -- These are diff core-to-core passes,
 170                         -- which may be invoked in any order,
 171                         -- as many times as you like.
 172
 173   = CoreDoSimplify      -- The core-to-core simplifier.
 174         SimplifierMode
 175         [SimplifierSwitch]
 176                         -- Each run of the simplifier can take a different
 177                         -- set of simplifier-specific flags.
 178   | CoreDoFloatInwards
 179   | CoreDoFloatOutwards FloatOutSwitches
 180   | CoreLiberateCase
 181   | CoreDoPrintCore
 182   | CoreDoStaticArgs
 183   | CoreDoStrictness
 184   | CoreDoWorkerWrapper
 185   | CoreDoSpecialising
 186   | CoreDoSpecConstr
 187   | CoreDoUSPInf
 188   | CoreDoCPResult
 189   | CoreDoGlomBinds
 190   | CoreCSE
 191   | CoreDoRuleCheck Int{-CompilerPhase-} String -- Check for non-application of rules
 192                                                 -- matching this string
 193
 194   | CoreDoNothing        -- useful when building up lists of these things
 195 \end{code}
 196
 197 \begin{code}
 198 data StgToDo
 199   = StgDoMassageForProfiling  -- should be (next to) last
 200   -- There's also setStgVarInfo, but its absolute "lastness"
 201   -- is so critical that it is hardwired in (no flag).
 202   | D_stg_stats
 203 \end{code}
 204
 205 \begin{code}
 206 data SimplifierMode             -- See comments in SimplMonad
 207   = SimplGently
 208   | SimplPhase Int
 209
 210 data SimplifierSwitch
 211   = MaxSimplifierIterations Int
 212   | NoCaseOfCase
 213
 214 data FloatOutSwitches
 215   = FloatOutSw  Bool    -- True <=> float lambdas to top level
 216                 Bool    -- True <=> float constants to top level,
 217                         --          even if they do not escape a lambda
 218 \end{code}
 219
 220 %************************************************************************
 221 %*                                                                      *
 222 \subsection{Dynamic command-line options}
 223 %*                                                                      *
 224 %************************************************************************
 225
 226 \begin{code}
 227 data DynFlag
 228
 229    -- debugging flags
 230    = Opt_D_dump_absC
 231    | Opt_D_dump_asm
 232    | Opt_D_dump_cpranal
 233    | Opt_D_dump_deriv
 234    | Opt_D_dump_ds
 235    | Opt_D_dump_flatC
 236    | Opt_D_dump_foreign
 237    | Opt_D_dump_inlinings
 238    | Opt_D_dump_occur_anal
 239    | Opt_D_dump_parsed
 240    | Opt_D_dump_realC
 241    | Opt_D_dump_rn
 242    | Opt_D_dump_simpl
 243    | Opt_D_dump_simpl_iterations
 244    | Opt_D_dump_spec
 245    | Opt_D_dump_prep
 246    | Opt_D_dump_stg
 247    | Opt_D_dump_stranal
 248    | Opt_D_dump_tc
 249    | Opt_D_dump_types
 250    | Opt_D_dump_rules
 251    | Opt_D_dump_usagesp
 252    | Opt_D_dump_cse
 253    | Opt_D_dump_worker_wrapper
 254    | Opt_D_dump_rn_trace
 255    | Opt_D_dump_rn_stats
 256    | Opt_D_dump_stix
 257    | Opt_D_dump_simpl_stats
 258    | Opt_D_dump_tc_trace
 259    | Opt_D_dump_BCOs
 260    | Opt_D_dump_vect
 261    | Opt_D_source_stats
 262    | Opt_D_verbose_core2core
 263    | Opt_D_verbose_stg2stg
 264    | Opt_D_dump_hi
 265    | Opt_D_dump_hi_diffs
 266    | Opt_D_dump_minimal_imports
 267    | Opt_DoCoreLinting
 268    | Opt_DoStgLinting
 269    | Opt_DoUSPLinting
 270
 271    | Opt_WarnDuplicateExports
 272    | Opt_WarnHiShadows
 273    | Opt_WarnIncompletePatterns
 274    | Opt_WarnMissingFields
 275    | Opt_WarnMissingMethods
 276    | Opt_WarnMissingSigs
 277    | Opt_WarnNameShadowing
 278    | Opt_WarnOverlappingPatterns
 279    | Opt_WarnSimplePatterns
 280    | Opt_WarnTypeDefaults
 281    | Opt_WarnUnusedBinds
 282    | Opt_WarnUnusedImports
 283    | Opt_WarnUnusedMatches
 284    | Opt_WarnDeprecations
 285    | Opt_WarnMisc
 286
 287    -- language opts
 288    | Opt_AllowOverlappingInstances
 289    | Opt_AllowUndecidableInstances
 290    | Opt_AllowIncoherentInstances
 291    | Opt_NoMonomorphismRestriction
 292    | Opt_GlasgowExts
 293    | Opt_PArr                          -- syntactic support for parallel arrays
 294    | Opt_Generics
 295    | Opt_NoImplicitPrelude
 296
 297    deriving (Eq)
 298
 299 data DynFlags = DynFlags {
 300   coreToDo              :: [CoreToDo],
 301   stgToDo               :: [StgToDo],
 302   hscLang               :: HscLang,
 303   hscOutName            :: String,      -- name of the output file
 304   hscStubHOutName       :: String,      -- name of the .stub_h output file
 305   hscStubCOutName       :: String,      -- name of the .stub_c output file
 306   extCoreName           :: String,      -- name of the .core output file
 307   verbosity             :: Int,         -- verbosity level
 308   cppFlag               :: Bool,        -- preprocess with cpp?
 309   ppFlag                :: Bool,        -- preprocess with a Haskell Pp?
 310   stolen_x86_regs       :: Int,
 311   cmdlineHcIncludes     :: [String],    -- -#includes
 312
 313   -- options for particular phases
 314   opt_L                 :: [String],
 315   opt_P                 :: [String],
 316   opt_F                 :: [String],
 317   opt_c                 :: [String],
 318   opt_a                 :: [String],
 319   opt_m                 :: [String],
 320 #ifdef ILX
 321   opt_I                 :: [String],
 322   opt_i                 :: [String],
 323 #endif
 324
 325   -- hsc dynamic flags
 326   flags                 :: [DynFlag]
 327  }
 328
 329 data HscLang
 330   = HscC
 331   | HscAsm
 332   | HscJava
 333   | HscILX
 334   | HscInterpreted
 335   | HscNothing
 336     deriving (Eq, Show)
 337
 338 defaultDynFlags = DynFlags {
 339   coreToDo = [], stgToDo = [],
 340   hscLang = HscC,
 341   hscOutName = "",
 342   hscStubHOutName = "", hscStubCOutName = "",
 343   extCoreName = "",
 344   verbosity = 0,
 345   cppFlag               = False,
 346   ppFlag                = False,
 347   stolen_x86_regs       = 4,
 348   cmdlineHcIncludes     = [],
 349   opt_L                 = [],
 350   opt_P                 = [],
 351   opt_F                 = [],
 352   opt_c                 = [],
 353   opt_a                 = [],
 354   opt_m                 = [],
 355 #ifdef ILX
 356   opt_I                 = [],
 357   opt_i                 = [],
 358 #endif
 359   flags = standardWarnings,
 360   }
 361
 362 {-
 363     Verbosity levels:
 364
 365     0   |   print errors & warnings only
 366     1   |   minimal verbosity: print "compiling M ... done." for each module.
 367     2   |   equivalent to -dshow-passes
 368     3   |   equivalent to existing "ghc -v"
 369     4   |   "ghc -v -ddump-most"
 370     5   |   "ghc -v -ddump-all"
 371 -}
 372
 373 dopt :: DynFlag -> DynFlags -> Bool
 374 dopt f dflags  = f `elem` (flags dflags)
 375
 376 dopt_CoreToDo :: DynFlags -> [CoreToDo]
 377 dopt_CoreToDo = coreToDo
 378
 379 dopt_StgToDo :: DynFlags -> [StgToDo]
 380 dopt_StgToDo = stgToDo
 381
 382 dopt_OutName :: DynFlags -> String
 383 dopt_OutName = hscOutName
 384
 385 dopt_HscLang :: DynFlags -> HscLang
 386 dopt_HscLang = hscLang
 387
 388 dopt_set :: DynFlags -> DynFlag -> DynFlags
 389 dopt_set dfs f = dfs{ flags = f : flags dfs }
 390
 391 dopt_unset :: DynFlags -> DynFlag -> DynFlags
 392 dopt_unset dfs f = dfs{ flags = filter (/= f) (flags dfs) }
 393
 394 getOpts :: (DynFlags -> [a]) -> IO [a]
 395         -- We add to the options from the front, so we need to reverse the list
 396 getOpts opts = dynFlag opts >>= return . reverse
 397
 398 -- we can only switch between HscC, HscAsmm, and HscILX with dynamic flags
 399 -- (-fvia-C, -fasm, -filx respectively).
 400 setLang l = updDynFlags (\ dfs -> case hscLang dfs of
 401                                         HscC   -> dfs{ hscLang = l }
 402                                         HscAsm -> dfs{ hscLang = l }
 403                                         HscILX -> dfs{ hscLang = l }
 404                                         _      -> dfs)
 405
 406 getVerbFlag = do
 407    verb <- dynFlag verbosity
 408    if verb >= 3  then return  "-v" else return ""
 409 \end{code}
 410
 411 -----------------------------------------------------------------------------
 412 -- Mess about with the mutable variables holding the dynamic arguments
 413
 414 -- v_InitDynFlags
 415 --      is the "baseline" dynamic flags, initialised from
 416 --      the defaults and command line options, and updated by the
 417 --      ':s' command in GHCi.
 418 --
 419 -- v_DynFlags
 420 --      is the dynamic flags for the current compilation.  It is reset
 421 --      to the value of v_InitDynFlags before each compilation, then
 422 --      updated by reading any OPTIONS pragma in the current module.
 423
 424 \begin{code}
 425 GLOBAL_VAR(v_InitDynFlags, defaultDynFlags, DynFlags)
 426 GLOBAL_VAR(v_DynFlags,     defaultDynFlags, DynFlags)
 427
 428 setDynFlags :: DynFlags -> IO ()
 429 setDynFlags dfs = writeIORef v_DynFlags dfs
 430
 431 saveDynFlags :: IO ()
 432 saveDynFlags = do dfs <- readIORef v_DynFlags
 433                   writeIORef v_InitDynFlags dfs
 434
 435 restoreDynFlags :: IO DynFlags
 436 restoreDynFlags = do dfs <- readIORef v_InitDynFlags
 437                      writeIORef v_DynFlags dfs
 438                      return dfs
 439
 440 getDynFlags :: IO DynFlags
 441 getDynFlags = readIORef v_DynFlags
 442
 443 updDynFlags :: (DynFlags -> DynFlags) -> IO ()
 444 updDynFlags f = do dfs <- readIORef v_DynFlags
 445                    writeIORef v_DynFlags (f dfs)
 446
 447 dynFlag :: (DynFlags -> a) -> IO a
 448 dynFlag f = do dflags <- readIORef v_DynFlags; return (f dflags)
 449
 450 setDynFlag, unSetDynFlag :: DynFlag -> IO ()
 451 setDynFlag f   = updDynFlags (\dfs -> dopt_set dfs f)
 452 unSetDynFlag f = updDynFlags (\dfs -> dopt_unset dfs f)
 453 \end{code}
 454
 455
 456 %************************************************************************
 457 %*                                                                      *
 458 \subsection{Warnings}
 459 %*                                                                      *
 460 %************************************************************************
 461
 462 \begin{code}
 463 standardWarnings
 464     = [ Opt_WarnDeprecations,
 465         Opt_WarnOverlappingPatterns,
 466         Opt_WarnMissingFields,
 467         Opt_WarnMissingMethods,
 468         Opt_WarnDuplicateExports
 469       ]
 470
 471 minusWOpts
 472     = standardWarnings ++
 473       [ Opt_WarnUnusedBinds,
 474         Opt_WarnUnusedMatches,
 475         Opt_WarnUnusedImports,
 476         Opt_WarnIncompletePatterns,
 477         Opt_WarnMisc
 478       ]
 479
 480 minusWallOpts
 481     = minusWOpts ++
 482       [ Opt_WarnTypeDefaults,
 483         Opt_WarnNameShadowing,
 484         Opt_WarnMissingSigs,
 485         Opt_WarnHiShadows
 486       ]
 487 \end{code}
 488
 489 %************************************************************************
 490 %*                                                                      *
 491 \subsection{Classifying command-line options}
 492 %*                                                                      *
 493 %************************************************************************
 494
 495 \begin{code}
 496 -- v_Statis_hsc_opts is here to avoid a circular dependency with
 497 -- main/DriverState.
 498 GLOBAL_VAR(v_Static_hsc_opts, [], [String])
 499
 500 lookUp           :: FastString -> Bool
 501 lookup_int       :: String -> Maybe Int
 502 lookup_def_int   :: String -> Int -> Int
 503 lookup_def_float :: String -> Float -> Float
 504 lookup_str       :: String -> Maybe String
 505
 506 unpacked_static_opts = unsafePerformIO (readIORef v_Static_hsc_opts)
 507 packed_static_opts   = map mkFastString unpacked_static_opts
 508
 509 lookUp     sw = sw `elem` packed_static_opts
 510
 511 lookup_str sw = firstJust (map (startsWith sw) unpacked_static_opts)
 512
 513 lookup_int sw = case (lookup_str sw) of
 514                   Nothing -> Nothing
 515                   Just xx -> Just (read xx)
 516
 517 lookup_def_int sw def = case (lookup_str sw) of
 518                             Nothing -> def              -- Use default
 519                             Just xx -> read xx
 520
 521 lookup_def_float sw def = case (lookup_str sw) of
 522                             Nothing -> def              -- Use default
 523                             Just xx -> read xx
 524
 525
 526 {-
 527  Putting the compiler options into temporary at-files
 528  may turn out to be necessary later on if we turn hsc into
 529  a pure Win32 application where I think there's a command-line
 530  length limit of 255. unpacked_opts understands the @ option.
 531
 532 unpacked_opts :: [String]
 533 unpacked_opts =
 534   concat $
 535   map (expandAts) $
 536   map _UNPK_ argv  -- NOT ARGV any more: v_Static_hsc_opts
 537   where
 538    expandAts ('@':fname) = words (unsafePerformIO (readFile fname))
 539    expandAts l = [l]
 540 -}
 541 \end{code}
 542
 543 %************************************************************************
 544 %*                                                                      *
 545 \subsection{Static options}
 546 %*                                                                      *
 547 %************************************************************************
 548
 549 \begin{code}
 550 -- debugging opts
 551 opt_PprStyle_NoPrags            = lookUp  FSLIT("-dppr-noprags")
 552 opt_PprStyle_Debug              = lookUp  FSLIT("-dppr-debug")
 553 opt_PprStyle_RawTypes           = lookUp  FSLIT("-dppr-rawtypes")
 554 opt_PprUserLength               = lookup_def_int "-dppr-user-length" 5 --ToDo: give this a name
 555
 556 -- profiling opts
 557 opt_AutoSccsOnAllToplevs        = lookUp  FSLIT("-fauto-sccs-on-all-toplevs")
 558 opt_AutoSccsOnExportedToplevs   = lookUp  FSLIT("-fauto-sccs-on-exported-toplevs")
 559 opt_AutoSccsOnIndividualCafs    = lookUp  FSLIT("-fauto-sccs-on-individual-cafs")
 560 opt_AutoSccsOnDicts             = lookUp  FSLIT("-fauto-sccs-on-dicts")
 561 opt_SccProfilingOn              = lookUp  FSLIT("-fscc-profiling")
 562 opt_DoTickyProfiling            = lookUp  FSLIT("-fticky-ticky")
 563
 564 -- language opts
 565 opt_AllStrict                   = lookUp  FSLIT("-fall-strict")
 566 opt_DictsStrict                 = lookUp  FSLIT("-fdicts-strict")
 567 opt_IrrefutableTuples           = lookUp  FSLIT("-firrefutable-tuples")
 568 opt_MaxContextReductionDepth    = lookup_def_int "-fcontext-stack" mAX_CONTEXT_REDUCTION_DEPTH
 569 opt_NumbersStrict               = lookUp  FSLIT("-fnumbers-strict")
 570 opt_Parallel                    = lookUp  FSLIT("-fparallel")
 571 opt_SMP                         = lookUp  FSLIT("-fsmp")
 572 opt_Flatten                     = lookUp  FSLIT("-fflatten")
 573
 574 -- optimisation opts
 575 opt_NoMethodSharing             = lookUp  FSLIT("-fno-method-sharing")
 576 opt_DoSemiTagging               = lookUp  FSLIT("-fsemi-tagging")
 577 opt_FoldrBuildOn                = lookUp  FSLIT("-ffoldr-build-on")
 578 opt_LiberateCaseThreshold       = lookup_def_int "-fliberate-case-threshold" (10::Int)
 579 opt_StgDoLetNoEscapes           = lookUp  FSLIT("-flet-no-escape")
 580 opt_UnfoldCasms                 = lookUp  FSLIT("-funfold-casms-in-hi-file")
 581 opt_UsageSPOn                   = lookUp  FSLIT("-fusagesp-on")
 582 opt_UnboxStrictFields           = lookUp  FSLIT("-funbox-strict-fields")
 583 opt_MaxWorkerArgs               = lookup_def_int "-fmax-worker-args" (10::Int)
 584
 585 {-
 586    The optional '-inpackage=P' flag tells what package
 587    we are compiling this module for.
 588    The Prelude, for example is compiled with '-inpackage std'
 589 -}
 590 opt_InPackage                   = case lookup_str "-inpackage=" of
 591                                     Just p  -> _PK_ p
 592                                     Nothing -> FSLIT("Main")    -- The package name if none is specified
 593
 594 opt_EmitCExternDecls            = lookUp  FSLIT("-femit-extern-decls")
 595 opt_EnsureSplittableC           = lookUp  FSLIT("-fglobalise-toplev-names")
 596 opt_GranMacros                  = lookUp  FSLIT("-fgransim")
 597 opt_HiVersion                   = read (cProjectVersionInt ++ cProjectPatchLevel) :: Int
 598 opt_HistorySize                 = lookup_def_int "-fhistory-size" 20
 599 opt_IgnoreAsserts               = lookUp  FSLIT("-fignore-asserts")
 600 opt_IgnoreIfacePragmas          = lookUp  FSLIT("-fignore-interface-pragmas")
 601 opt_NoHiCheck                   = lookUp  FSLIT("-fno-hi-version-check")
 602 opt_OmitBlackHoling             = lookUp  FSLIT("-dno-black-holing")
 603 opt_OmitInterfacePragmas        = lookUp  FSLIT("-fomit-interface-pragmas")
 604 opt_RuntimeTypes                = lookUp  FSLIT("-fruntime-types")
 605
 606 -- Simplifier switches
 607 opt_SimplNoPreInlining          = lookUp  FSLIT("-fno-pre-inlining")
 608         -- NoPreInlining is there just to see how bad things
 609         -- get if you don't do it!
 610 opt_SimplDoEtaReduction         = lookUp  FSLIT("-fdo-eta-reduction")
 611 opt_SimplDoLambdaEtaExpansion   = lookUp  FSLIT("-fdo-lambda-eta-expansion")
 612 opt_SimplCaseMerge              = lookUp  FSLIT("-fcase-merge")
 613 opt_SimplExcessPrecision        = lookUp  FSLIT("-fexcess-precision")
 614
 615 -- Unfolding control
 616 opt_UF_CreationThreshold        = lookup_def_int "-funfolding-creation-threshold"  (45::Int)
 617 opt_UF_UseThreshold             = lookup_def_int "-funfolding-use-threshold"       (8::Int)     -- Discounts can be big
 618 opt_UF_FunAppDiscount           = lookup_def_int "-funfolding-fun-discount"        (6::Int)     -- It's great to inline a fn
 619 opt_UF_KeenessFactor            = lookup_def_float "-funfolding-keeness-factor"    (1.5::Float)
 620 opt_UF_UpdateInPlace            = lookUp  FSLIT("-funfolding-update-in-place")
 621
 622 opt_UF_CheapOp  = ( 1 :: Int)   -- Only one instruction; and the args are charged for
 623 opt_UF_DearOp   = ( 4 :: Int)
 624
 625 opt_NoPruneDecls                = lookUp  FSLIT("-fno-prune-decls")
 626 opt_NoPruneTyDecls              = lookUp  FSLIT("-fno-prune-tydecls")
 627 opt_Static                      = lookUp  FSLIT("-static")
 628 opt_Unregisterised              = lookUp  FSLIT("-funregisterised")
 629 opt_EmitExternalCore            = lookUp  FSLIT("-fext-core")
 630 \end{code}
 631
 632 %************************************************************************
 633 %*                                                                      *
 634 \subsection{List of static hsc flags}
 635 %*                                                                      *
 636 %************************************************************************
 637
 638 \begin{code}
 639 isStaticHscFlag f =
 640   f `elem` [
 641         "fauto-sccs-on-all-toplevs",
 642         "fauto-sccs-on-exported-toplevs",
 643         "fauto-sccs-on-individual-cafs",
 644         "fauto-sccs-on-dicts",
 645         "fscc-profiling",
 646         "fticky-ticky",
 647         "fall-strict",
 648         "fdicts-strict",
 649         "firrefutable-tuples",
 650         "fnumbers-strict",
 651         "fparallel",
 652         "fsmp",
 653         "fflatten",
 654         "fsemi-tagging",
 655         "ffoldr-build-on",
 656         "flet-no-escape",
 657         "funfold-casms-in-hi-file",
 658         "fusagesp-on",
 659         "funbox-strict-fields",
 660         "femit-extern-decls",
 661         "fglobalise-toplev-names",
 662         "fgransim",
 663         "fignore-asserts",
 664         "fignore-interface-pragmas",
 665         "fno-hi-version-check",
 666         "dno-black-holing",
 667         "fno-method-sharing",
 668         "fomit-interface-pragmas",
 669         "fruntime-types",
 670         "fno-pre-inlining",
 671         "fdo-eta-reduction",
 672         "fdo-lambda-eta-expansion",
 673         "fcase-merge",
 674         "fexcess-precision",
 675         "funfolding-update-in-place",
 676         "fno-prune-decls",
 677         "fno-prune-tydecls",
 678         "static",
 679         "funregisterised",
 680         "fext-core",
 681         "frule-check"
 682         ]
 683   || any (flip prefixMatch f) [
 684         "fcontext-stack",
 685         "fliberate-case-threshold",
 686         "fmax-worker-args",
 687         "fhistory-size",
 688         "funfolding-creation-threshold",
 689         "funfolding-use-threshold",
 690         "funfolding-fun-discount",
 691         "funfolding-keeness-factor"
 692      ]
 693 \end{code}
 694
 695 %************************************************************************
 696 %*                                                                      *
 697 \subsection{Misc functions for command-line options}
 698 %*                                                                      *
 699 %************************************************************************
 700
 701
 702
 703 \begin{code}
 704 startsWith :: String -> String -> Maybe String
 705 -- startsWith pfx (pfx++rest) = Just rest
 706
 707 startsWith []     str = Just str
 708 startsWith (c:cs) (s:ss)
 709   = if c /= s then Nothing else startsWith cs ss
 710 startsWith  _     []  = Nothing
 711
 712 endsWith  :: String -> String -> Maybe String
 713 endsWith cs ss
 714   = case (startsWith (reverse cs) (reverse ss)) of
 715       Nothing -> Nothing
 716       Just rs -> Just (reverse rs)
 717 \end{code}