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         defaultHscLang,                 -- HscLang
  24         dopt,                           -- DynFlag -> DynFlags -> Bool
  25         dopt_set, dopt_unset,           -- DynFlags -> DynFlag -> DynFlags
  26         dopt_CoreToDo,                  -- DynFlags -> [CoreToDo]
  27         dopt_StgToDo,                   -- DynFlags -> [StgToDo]
  28         dopt_HscLang,                   -- DynFlags -> HscLang
  29         dopt_OutName,                   -- DynFlags -> String
  30         getOpts,                        -- (DynFlags -> [a]) -> IO [a]
  31         setLang,
  32         getVerbFlag,
  33
  34         -- Manipulating the DynFlags state
  35         getDynFlags,                    -- IO DynFlags
  36         setDynFlags,                    -- DynFlags -> IO ()
  37         updDynFlags,                    -- (DynFlags -> DynFlags) -> IO ()
  38         dynFlag,                        -- (DynFlags -> a) -> IO a
  39         setDynFlag, unSetDynFlag,       -- DynFlag -> IO ()
  40         saveDynFlags,                   -- IO ()
  41         restoreDynFlags,                -- IO DynFlags
  42
  43         -- sets of warning opts
  44         standardWarnings,
  45         minusWOpts,
  46         minusWallOpts,
  47
  48         -- Output style options
  49         opt_PprStyle_NoPrags,
  50         opt_PprStyle_RawTypes,
  51         opt_PprUserLength,
  52         opt_PprStyle_Debug,
  53
  54         -- profiling opts
  55         opt_AutoSccsOnAllToplevs,
  56         opt_AutoSccsOnExportedToplevs,
  57         opt_AutoSccsOnIndividualCafs,
  58         opt_AutoSccsOnDicts,
  59         opt_SccProfilingOn,
  60         opt_DoTickyProfiling,
  61
  62         -- language opts
  63         opt_AllStrict,
  64         opt_DictsStrict,
  65         opt_MaxContextReductionDepth,
  66         opt_IrrefutableTuples,
  67         opt_NumbersStrict,
  68         opt_Parallel,
  69         opt_SMP,
  70         opt_RuntimeTypes,
  71         opt_Flatten,
  72
  73         -- optimisation opts
  74         opt_NoMethodSharing,
  75         opt_DoSemiTagging,
  76         opt_LiberateCaseThreshold,
  77         opt_StgDoLetNoEscapes,
  78         opt_UnfoldCasms,
  79         opt_CprOff,
  80         opt_RulesOff,
  81         opt_UnboxStrictFields,
  82         opt_SimplNoPreInlining,
  83         opt_SimplDoEtaReduction,
  84         opt_SimplDoLambdaEtaExpansion,
  85         opt_SimplCaseMerge,
  86         opt_SimplExcessPrecision,
  87         opt_MaxWorkerArgs,
  88
  89         -- Unfolding control
  90         opt_UF_CreationThreshold,
  91         opt_UF_UseThreshold,
  92         opt_UF_FunAppDiscount,
  93         opt_UF_KeenessFactor,
  94         opt_UF_UpdateInPlace,
  95         opt_UF_CheapOp,
  96         opt_UF_DearOp,
  97
  98         -- misc opts
  99         opt_InPackage,
 100         opt_EmitCExternDecls,
 101         opt_EnsureSplittableC,
 102         opt_GranMacros,
 103         opt_HiVersion,
 104         opt_HistorySize,
 105         opt_IgnoreAsserts,
 106         opt_IgnoreIfacePragmas,
 107         opt_NoHiCheck,
 108         opt_OmitBlackHoling,
 109         opt_OmitInterfacePragmas,
 110         opt_NoPruneDecls,
 111         opt_Static,
 112         opt_Unregisterised,
 113         opt_EmitExternalCore
 114     ) where
 115
 116 #include "HsVersions.h"
 117
 118 import Constants        -- Default values for some flags
 119 import Util
 120 import FastString       ( FastString, mkFastString )
 121 import Config
 122 import Maybes           ( firstJust )
 123
 124 import GLAEXTS
 125 import DATA_IOREF       ( IORef, readIORef, writeIORef )
 126 import UNSAFE_IO        ( unsafePerformIO )
 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   | CoreDoOldStrictness
 188   | CoreDoGlomBinds
 189   | CoreCSE
 190   | CoreDoRuleCheck Int{-CompilerPhase-} String -- Check for non-application of rules
 191                                                 -- matching this string
 192
 193   | CoreDoNothing        -- useful when building up lists of these things
 194 \end{code}
 195
 196 \begin{code}
 197 data StgToDo
 198   = StgDoMassageForProfiling  -- should be (next to) last
 199   -- There's also setStgVarInfo, but its absolute "lastness"
 200   -- is so critical that it is hardwired in (no flag).
 201   | D_stg_stats
 202 \end{code}
 203
 204 \begin{code}
 205 data SimplifierMode             -- See comments in SimplMonad
 206   = SimplGently
 207   | SimplPhase Int
 208
 209 data SimplifierSwitch
 210   = MaxSimplifierIterations Int
 211   | NoCaseOfCase
 212
 213 data FloatOutSwitches
 214   = FloatOutSw  Bool    -- True <=> float lambdas to top level
 215                 Bool    -- True <=> float constants to top level,
 216                         --          even if they do not escape a lambda
 217 \end{code}
 218
 219 %************************************************************************
 220 %*                                                                      *
 221 \subsection{Dynamic command-line options}
 222 %*                                                                      *
 223 %************************************************************************
 224
 225 \begin{code}
 226 data DynFlag
 227
 228    -- debugging flags
 229    = Opt_D_dump_absC
 230    | Opt_D_dump_asm
 231    | Opt_D_dump_cpranal
 232    | Opt_D_dump_deriv
 233    | Opt_D_dump_ds
 234    | Opt_D_dump_flatC
 235    | Opt_D_dump_foreign
 236    | Opt_D_dump_inlinings
 237    | Opt_D_dump_occur_anal
 238    | Opt_D_dump_parsed
 239    | Opt_D_dump_realC
 240    | Opt_D_dump_rn
 241    | Opt_D_dump_simpl
 242    | Opt_D_dump_simpl_iterations
 243    | Opt_D_dump_spec
 244    | Opt_D_dump_prep
 245    | Opt_D_dump_stg
 246    | Opt_D_dump_stranal
 247    | Opt_D_dump_tc
 248    | Opt_D_dump_types
 249    | Opt_D_dump_rules
 250    | Opt_D_dump_cse
 251    | Opt_D_dump_worker_wrapper
 252    | Opt_D_dump_rn_trace
 253    | Opt_D_dump_rn_stats
 254    | Opt_D_dump_stix
 255    | Opt_D_dump_simpl_stats
 256    | Opt_D_dump_tc_trace
 257    | Opt_D_dump_splices
 258    | Opt_D_dump_BCOs
 259    | Opt_D_dump_vect
 260    | Opt_D_source_stats
 261    | Opt_D_verbose_core2core
 262    | Opt_D_verbose_stg2stg
 263    | Opt_D_dump_hi
 264    | Opt_D_dump_hi_diffs
 265    | Opt_D_dump_minimal_imports
 266    | Opt_DoCoreLinting
 267    | Opt_DoStgLinting
 268
 269    | Opt_WarnIsError            -- -Werror; makes warnings fatal
 270    | Opt_WarnDuplicateExports
 271    | Opt_WarnHiShadows
 272    | Opt_WarnIncompletePatterns
 273    | Opt_WarnMissingFields
 274    | Opt_WarnMissingMethods
 275    | Opt_WarnMissingSigs
 276    | Opt_WarnNameShadowing
 277    | Opt_WarnOverlappingPatterns
 278    | Opt_WarnSimplePatterns
 279    | Opt_WarnTypeDefaults
 280    | Opt_WarnUnusedBinds
 281    | Opt_WarnUnusedImports
 282    | Opt_WarnUnusedMatches
 283    | Opt_WarnDeprecations
 284    | Opt_WarnMisc
 285
 286    -- language opts
 287    | Opt_AllowOverlappingInstances
 288    | Opt_AllowUndecidableInstances
 289    | Opt_AllowIncoherentInstances
 290    | Opt_NoMonomorphismRestriction
 291    | Opt_GlasgowExts
 292    | Opt_FFI
 293    | Opt_PArr                          -- syntactic support for parallel arrays
 294    | Opt_With                          -- deprecated keyword for implicit parms
 295    | Opt_Arrows                        -- Arrow-notation syntax
 296    | Opt_TH
 297    | Opt_ImplicitParams
 298    | Opt_Generics
 299    | Opt_NoImplicitPrelude
 300
 301    deriving (Eq)
 302
 303 data DynFlags = DynFlags {
 304   coreToDo              :: [CoreToDo],
 305   stgToDo               :: [StgToDo],
 306   hscLang               :: HscLang,
 307   hscOutName            :: String,      -- name of the output file
 308   hscStubHOutName       :: String,      -- name of the .stub_h output file
 309   hscStubCOutName       :: String,      -- name of the .stub_c output file
 310   extCoreName           :: String,      -- name of the .core output file
 311   verbosity             :: Int,         -- verbosity level
 312   cppFlag               :: Bool,        -- preprocess with cpp?
 313   ppFlag                :: Bool,        -- preprocess with a Haskell Pp?
 314   stolen_x86_regs       :: Int,
 315   cmdlineHcIncludes     :: [String],    -- -#includes
 316
 317   -- options for particular phases
 318   opt_L                 :: [String],
 319   opt_P                 :: [String],
 320   opt_F                 :: [String],
 321   opt_c                 :: [String],
 322   opt_a                 :: [String],
 323   opt_m                 :: [String],
 324 #ifdef ILX
 325   opt_I                 :: [String],
 326   opt_i                 :: [String],
 327 #endif
 328
 329   -- hsc dynamic flags
 330   flags                 :: [DynFlag]
 331  }
 332
 333 data HscLang
 334   = HscC
 335   | HscAsm
 336   | HscJava
 337   | HscILX
 338   | HscInterpreted
 339   | HscNothing
 340     deriving (Eq, Show)
 341
 342 defaultHscLang
 343   | cGhcWithNativeCodeGen == "YES" &&
 344         (prefixMatch "i386" cTARGETPLATFORM ||
 345          prefixMatch "sparc" cTARGETPLATFORM ||
 346          prefixMatch "powerpc" cTARGETPLATFORM)   =  HscAsm
 347   | otherwise                                   =  HscC
 348
 349 defaultDynFlags = DynFlags {
 350   coreToDo = [], stgToDo = [],
 351   hscLang = defaultHscLang,
 352   hscOutName = "",
 353   hscStubHOutName = "", hscStubCOutName = "",
 354   extCoreName = "",
 355   verbosity = 0,
 356   cppFlag               = False,
 357   ppFlag                = False,
 358   stolen_x86_regs       = 4,
 359   cmdlineHcIncludes     = [],
 360   opt_L                 = [],
 361   opt_P                 = [],
 362   opt_F                 = [],
 363   opt_c                 = [],
 364   opt_a                 = [],
 365   opt_m                 = [],
 366 #ifdef ILX
 367   opt_I                 = [],
 368   opt_i                 = [],
 369 #endif
 370   flags = [Opt_Generics] ++ standardWarnings,
 371         -- Generating the helper-functions for
 372         -- generics is now on by default
 373   }
 374
 375 {-
 376     Verbosity levels:
 377
 378     0   |   print errors & warnings only
 379     1   |   minimal verbosity: print "compiling M ... done." for each module.
 380     2   |   equivalent to -dshow-passes
 381     3   |   equivalent to existing "ghc -v"
 382     4   |   "ghc -v -ddump-most"
 383     5   |   "ghc -v -ddump-all"
 384 -}
 385
 386 dopt :: DynFlag -> DynFlags -> Bool
 387 dopt f dflags  = f `elem` (flags dflags)
 388
 389 dopt_CoreToDo :: DynFlags -> [CoreToDo]
 390 dopt_CoreToDo = coreToDo
 391
 392 dopt_StgToDo :: DynFlags -> [StgToDo]
 393 dopt_StgToDo = stgToDo
 394
 395 dopt_OutName :: DynFlags -> String
 396 dopt_OutName = hscOutName
 397
 398 dopt_HscLang :: DynFlags -> HscLang
 399 dopt_HscLang = hscLang
 400
 401 dopt_set :: DynFlags -> DynFlag -> DynFlags
 402 dopt_set dfs f = dfs{ flags = f : flags dfs }
 403
 404 dopt_unset :: DynFlags -> DynFlag -> DynFlags
 405 dopt_unset dfs f = dfs{ flags = filter (/= f) (flags dfs) }
 406
 407 getOpts :: (DynFlags -> [a]) -> IO [a]
 408         -- We add to the options from the front, so we need to reverse the list
 409 getOpts opts = dynFlag opts >>= return . reverse
 410
 411 -- we can only switch between HscC, HscAsmm, and HscILX with dynamic flags
 412 -- (-fvia-C, -fasm, -filx respectively).
 413 setLang l = updDynFlags (\ dfs -> case hscLang dfs of
 414                                         HscC   -> dfs{ hscLang = l }
 415                                         HscAsm -> dfs{ hscLang = l }
 416                                         HscILX -> dfs{ hscLang = l }
 417                                         _      -> dfs)
 418
 419 getVerbFlag = do
 420    verb <- dynFlag verbosity
 421    if verb >= 3  then return  "-v" else return ""
 422 \end{code}
 423
 424 -----------------------------------------------------------------------------
 425 -- Mess about with the mutable variables holding the dynamic arguments
 426
 427 -- v_InitDynFlags
 428 --      is the "baseline" dynamic flags, initialised from
 429 --      the defaults and command line options, and updated by the
 430 --      ':s' command in GHCi.
 431 --
 432 -- v_DynFlags
 433 --      is the dynamic flags for the current compilation.  It is reset
 434 --      to the value of v_InitDynFlags before each compilation, then
 435 --      updated by reading any OPTIONS pragma in the current module.
 436
 437 \begin{code}
 438 GLOBAL_VAR(v_InitDynFlags, defaultDynFlags, DynFlags)
 439 GLOBAL_VAR(v_DynFlags,     defaultDynFlags, DynFlags)
 440
 441 setDynFlags :: DynFlags -> IO ()
 442 setDynFlags dfs = writeIORef v_DynFlags dfs
 443
 444 saveDynFlags :: IO ()
 445 saveDynFlags = do dfs <- readIORef v_DynFlags
 446                   writeIORef v_InitDynFlags dfs
 447
 448 restoreDynFlags :: IO DynFlags
 449 restoreDynFlags = do dfs <- readIORef v_InitDynFlags
 450                      writeIORef v_DynFlags dfs
 451                      return dfs
 452
 453 getDynFlags :: IO DynFlags
 454 getDynFlags = readIORef v_DynFlags
 455
 456 updDynFlags :: (DynFlags -> DynFlags) -> IO ()
 457 updDynFlags f = do dfs <- readIORef v_DynFlags
 458                    writeIORef v_DynFlags (f dfs)
 459
 460 dynFlag :: (DynFlags -> a) -> IO a
 461 dynFlag f = do dflags <- readIORef v_DynFlags; return (f dflags)
 462
 463 setDynFlag, unSetDynFlag :: DynFlag -> IO ()
 464 setDynFlag f   = updDynFlags (\dfs -> dopt_set dfs f)
 465 unSetDynFlag f = updDynFlags (\dfs -> dopt_unset dfs f)
 466 \end{code}
 467
 468
 469 %************************************************************************
 470 %*                                                                      *
 471 \subsection{Warnings}
 472 %*                                                                      *
 473 %************************************************************************
 474
 475 \begin{code}
 476 standardWarnings
 477     = [ Opt_WarnDeprecations,
 478         Opt_WarnOverlappingPatterns,
 479         Opt_WarnMissingFields,
 480         Opt_WarnMissingMethods,
 481         Opt_WarnDuplicateExports
 482       ]
 483
 484 minusWOpts
 485     = standardWarnings ++
 486       [ Opt_WarnUnusedBinds,
 487         Opt_WarnUnusedMatches,
 488         Opt_WarnUnusedImports,
 489         Opt_WarnIncompletePatterns,
 490         Opt_WarnMisc
 491       ]
 492
 493 minusWallOpts
 494     = minusWOpts ++
 495       [ Opt_WarnTypeDefaults,
 496         Opt_WarnNameShadowing,
 497         Opt_WarnMissingSigs,
 498         Opt_WarnHiShadows
 499       ]
 500 \end{code}
 501
 502 %************************************************************************
 503 %*                                                                      *
 504 \subsection{Classifying command-line options}
 505 %*                                                                      *
 506 %************************************************************************
 507
 508 \begin{code}
 509 -- v_Statis_hsc_opts is here to avoid a circular dependency with
 510 -- main/DriverState.
 511 GLOBAL_VAR(v_Static_hsc_opts, [], [String])
 512
 513 lookUp           :: FastString -> Bool
 514 lookup_int       :: String -> Maybe Int
 515 lookup_def_int   :: String -> Int -> Int
 516 lookup_def_float :: String -> Float -> Float
 517 lookup_str       :: String -> Maybe String
 518
 519 unpacked_static_opts = unsafePerformIO (readIORef v_Static_hsc_opts)
 520 packed_static_opts   = map mkFastString unpacked_static_opts
 521
 522 lookUp     sw = sw `elem` packed_static_opts
 523
 524 lookup_str sw = firstJust (map (startsWith sw) unpacked_static_opts)
 525
 526 lookup_int sw = case (lookup_str sw) of
 527                   Nothing -> Nothing
 528                   Just xx -> Just (read xx)
 529
 530 lookup_def_int sw def = case (lookup_str sw) of
 531                             Nothing -> def              -- Use default
 532                             Just xx -> read xx
 533
 534 lookup_def_float sw def = case (lookup_str sw) of
 535                             Nothing -> def              -- Use default
 536                             Just xx -> read xx
 537
 538
 539 {-
 540  Putting the compiler options into temporary at-files
 541  may turn out to be necessary later on if we turn hsc into
 542  a pure Win32 application where I think there's a command-line
 543  length limit of 255. unpacked_opts understands the @ option.
 544
 545 unpacked_opts :: [String]
 546 unpacked_opts =
 547   concat $
 548   map (expandAts) $
 549   map unpackFS argv  -- NOT ARGV any more: v_Static_hsc_opts
 550   where
 551    expandAts ('@':fname) = words (unsafePerformIO (readFile fname))
 552    expandAts l = [l]
 553 -}
 554 \end{code}
 555
 556 %************************************************************************
 557 %*                                                                      *
 558 \subsection{Static options}
 559 %*                                                                      *
 560 %************************************************************************
 561
 562 \begin{code}
 563 -- debugging opts
 564 opt_PprStyle_NoPrags            = lookUp  FSLIT("-dppr-noprags")
 565 opt_PprStyle_Debug              = lookUp  FSLIT("-dppr-debug")
 566 opt_PprStyle_RawTypes           = lookUp  FSLIT("-dppr-rawtypes")
 567 opt_PprUserLength               = lookup_def_int "-dppr-user-length" 5 --ToDo: give this a name
 568
 569 -- profiling opts
 570 opt_AutoSccsOnAllToplevs        = lookUp  FSLIT("-fauto-sccs-on-all-toplevs")
 571 opt_AutoSccsOnExportedToplevs   = lookUp  FSLIT("-fauto-sccs-on-exported-toplevs")
 572 opt_AutoSccsOnIndividualCafs    = lookUp  FSLIT("-fauto-sccs-on-individual-cafs")
 573 opt_AutoSccsOnDicts             = lookUp  FSLIT("-fauto-sccs-on-dicts")
 574 opt_SccProfilingOn              = lookUp  FSLIT("-fscc-profiling")
 575 opt_DoTickyProfiling            = lookUp  FSLIT("-fticky-ticky")
 576
 577 -- language opts
 578 opt_AllStrict                   = lookUp  FSLIT("-fall-strict")
 579 opt_DictsStrict                 = lookUp  FSLIT("-fdicts-strict")
 580 opt_IrrefutableTuples           = lookUp  FSLIT("-firrefutable-tuples")
 581 opt_MaxContextReductionDepth    = lookup_def_int "-fcontext-stack" mAX_CONTEXT_REDUCTION_DEPTH
 582 opt_NumbersStrict               = lookUp  FSLIT("-fnumbers-strict")
 583 opt_Parallel                    = lookUp  FSLIT("-fparallel")
 584 opt_SMP                         = lookUp  FSLIT("-fsmp")
 585 opt_Flatten                     = lookUp  FSLIT("-fflatten")
 586
 587 -- optimisation opts
 588 opt_NoMethodSharing             = lookUp  FSLIT("-fno-method-sharing")
 589 opt_DoSemiTagging               = lookUp  FSLIT("-fsemi-tagging")
 590 opt_CprOff                      = lookUp  FSLIT("-fcpr-off")
 591 opt_RulesOff                    = lookUp  FSLIT("-frules-off")
 592         -- Switch off CPR analysis in the new demand analyser
 593 opt_LiberateCaseThreshold       = lookup_def_int "-fliberate-case-threshold" (10::Int)
 594 opt_StgDoLetNoEscapes           = lookUp  FSLIT("-flet-no-escape")
 595 opt_UnfoldCasms                 = lookUp  FSLIT("-funfold-casms-in-hi-file")
 596 opt_UnboxStrictFields           = lookUp  FSLIT("-funbox-strict-fields")
 597 opt_MaxWorkerArgs               = lookup_def_int "-fmax-worker-args" (10::Int)
 598
 599 {-
 600    The optional '-inpackage=P' flag tells what package
 601    we are compiling this module for.
 602    The Prelude, for example is compiled with '-inpackage std'
 603 -}
 604 opt_InPackage                   = case lookup_str "-inpackage=" of
 605                                     Just p  -> mkFastString p
 606                                     Nothing -> FSLIT("Main")    -- The package name if none is specified
 607
 608 opt_EmitCExternDecls            = lookUp  FSLIT("-femit-extern-decls")
 609 opt_EnsureSplittableC           = lookUp  FSLIT("-fglobalise-toplev-names")
 610 opt_GranMacros                  = lookUp  FSLIT("-fgransim")
 611 opt_HiVersion                   = read (cProjectVersionInt ++ cProjectPatchLevel) :: Int
 612 opt_HistorySize                 = lookup_def_int "-fhistory-size" 20
 613 opt_IgnoreAsserts               = lookUp  FSLIT("-fignore-asserts")
 614 opt_IgnoreIfacePragmas          = lookUp  FSLIT("-fignore-interface-pragmas")
 615 opt_NoHiCheck                   = lookUp  FSLIT("-fno-hi-version-check")
 616 opt_OmitBlackHoling             = lookUp  FSLIT("-dno-black-holing")
 617 opt_OmitInterfacePragmas        = lookUp  FSLIT("-fomit-interface-pragmas")
 618 opt_RuntimeTypes                = lookUp  FSLIT("-fruntime-types")
 619
 620 -- Simplifier switches
 621 opt_SimplNoPreInlining          = lookUp  FSLIT("-fno-pre-inlining")
 622         -- NoPreInlining is there just to see how bad things
 623         -- get if you don't do it!
 624 opt_SimplDoEtaReduction         = lookUp  FSLIT("-fdo-eta-reduction")
 625 opt_SimplDoLambdaEtaExpansion   = lookUp  FSLIT("-fdo-lambda-eta-expansion")
 626 opt_SimplCaseMerge              = lookUp  FSLIT("-fcase-merge")
 627 opt_SimplExcessPrecision        = lookUp  FSLIT("-fexcess-precision")
 628
 629 -- Unfolding control
 630 opt_UF_CreationThreshold        = lookup_def_int "-funfolding-creation-threshold"  (45::Int)
 631 opt_UF_UseThreshold             = lookup_def_int "-funfolding-use-threshold"       (8::Int)     -- Discounts can be big
 632 opt_UF_FunAppDiscount           = lookup_def_int "-funfolding-fun-discount"        (6::Int)     -- It's great to inline a fn
 633 opt_UF_KeenessFactor            = lookup_def_float "-funfolding-keeness-factor"    (1.5::Float)
 634 opt_UF_UpdateInPlace            = lookUp  FSLIT("-funfolding-update-in-place")
 635
 636 opt_UF_CheapOp  = ( 1 :: Int)   -- Only one instruction; and the args are charged for
 637 opt_UF_DearOp   = ( 4 :: Int)
 638
 639 opt_NoPruneDecls                = lookUp  FSLIT("-fno-prune-decls")
 640 opt_Static                      = lookUp  FSLIT("-static")
 641 opt_Unregisterised              = lookUp  FSLIT("-funregisterised")
 642 opt_EmitExternalCore            = lookUp  FSLIT("-fext-core")
 643 \end{code}
 644
 645 %************************************************************************
 646 %*                                                                      *
 647 \subsection{List of static hsc flags}
 648 %*                                                                      *
 649 %************************************************************************
 650
 651 \begin{code}
 652 isStaticHscFlag f =
 653   f `elem` [
 654         "fauto-sccs-on-all-toplevs",
 655         "fauto-sccs-on-exported-toplevs",
 656         "fauto-sccs-on-individual-cafs",
 657         "fauto-sccs-on-dicts",
 658         "fscc-profiling",
 659         "fticky-ticky",
 660         "fall-strict",
 661         "fdicts-strict",
 662         "firrefutable-tuples",
 663         "fnumbers-strict",
 664         "fparallel",
 665         "fsmp",
 666         "fflatten",
 667         "fsemi-tagging",
 668         "flet-no-escape",
 669         "funfold-casms-in-hi-file",
 670         "funbox-strict-fields",
 671         "femit-extern-decls",
 672         "fglobalise-toplev-names",
 673         "fgransim",
 674         "fignore-asserts",
 675         "fignore-interface-pragmas",
 676         "fno-hi-version-check",
 677         "dno-black-holing",
 678         "fno-method-sharing",
 679         "fomit-interface-pragmas",
 680         "fruntime-types",
 681         "fno-pre-inlining",
 682         "fdo-eta-reduction",
 683         "fdo-lambda-eta-expansion",
 684         "fcase-merge",
 685         "fexcess-precision",
 686         "funfolding-update-in-place",
 687         "fno-prune-decls",
 688         "static",
 689         "funregisterised",
 690         "fext-core",
 691         "frule-check",
 692         "frules-off",
 693         "fcpr-off"
 694         ]
 695   || any (flip prefixMatch f) [
 696         "fcontext-stack",
 697         "fliberate-case-threshold",
 698         "fmax-worker-args",
 699         "fhistory-size",
 700         "funfolding-creation-threshold",
 701         "funfolding-use-threshold",
 702         "funfolding-fun-discount",
 703         "funfolding-keeness-factor"
 704      ]
 705 \end{code}
 706
 707 %************************************************************************
 708 %*                                                                      *
 709 \subsection{Misc functions for command-line options}
 710 %*                                                                      *
 711 %************************************************************************
 712
 713
 714
 715 \begin{code}
 716 startsWith :: String -> String -> Maybe String
 717 -- startsWith pfx (pfx++rest) = Just rest
 718
 719 startsWith []     str = Just str
 720 startsWith (c:cs) (s:ss)
 721   = if c /= s then Nothing else startsWith cs ss
 722 startsWith  _     []  = Nothing
 723
 724 endsWith  :: String -> String -> Maybe String
 725 endsWith cs ss
 726   = case (startsWith (reverse cs) (reverse ss)) of
 727       Nothing -> Nothing
 728       Just rs -> Just (reverse rs)
 729 \end{code}