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_FoldrBuildOn,
  77         opt_LiberateCaseThreshold,
  78         opt_StgDoLetNoEscapes,
  79         opt_UnfoldCasms,
  80         opt_CprOff,
  81         opt_UsageSPOn,
  82         opt_UnboxStrictFields,
  83         opt_SimplNoPreInlining,
  84         opt_SimplDoEtaReduction,
  85         opt_SimplDoLambdaEtaExpansion,
  86         opt_SimplCaseMerge,
  87         opt_SimplExcessPrecision,
  88         opt_MaxWorkerArgs,
  89
  90         -- Unfolding control
  91         opt_UF_CreationThreshold,
  92         opt_UF_UseThreshold,
  93         opt_UF_FunAppDiscount,
  94         opt_UF_KeenessFactor,
  95         opt_UF_UpdateInPlace,
  96         opt_UF_CheapOp,
  97         opt_UF_DearOp,
  98
  99         -- misc opts
 100         opt_InPackage,
 101         opt_EmitCExternDecls,
 102         opt_EnsureSplittableC,
 103         opt_GranMacros,
 104         opt_HiVersion,
 105         opt_HistorySize,
 106         opt_IgnoreAsserts,
 107         opt_IgnoreIfacePragmas,
 108         opt_NoHiCheck,
 109         opt_OmitBlackHoling,
 110         opt_OmitInterfacePragmas,
 111         opt_NoPruneTyDecls,
 112         opt_NoPruneDecls,
 113         opt_Static,
 114         opt_Unregisterised,
 115         opt_EmitExternalCore
 116     ) where
 117
 118 #include "HsVersions.h"
 119
 120 import GlaExts
 121 import IOExts   ( IORef, readIORef, writeIORef )
 122 import Constants        -- Default values for some flags
 123 import Util
 124 import FastTypes
 125 import FastString       ( FastString, mkFastString )
 126 import Config
 127
 128 import Maybes           ( firstJust )
 129 \end{code}
 130
 131 %************************************************************************
 132 %*                                                                      *
 133 \subsection{Command-line options}
 134 %*                                                                      *
 135 %************************************************************************
 136
 137 The hsc command-line options are split into two categories:
 138
 139   - static flags
 140   - dynamic flags
 141
 142 Static flags are represented by top-level values of type Bool or Int,
 143 for example.  They therefore have the same value throughout the
 144 invocation of hsc.
 145
 146 Dynamic flags are represented by an abstract type, DynFlags, which is
 147 passed into hsc by the compilation manager for every compilation.
 148 Dynamic flags are those that change on a per-compilation basis,
 149 perhaps because they may be present in the OPTIONS pragma at the top
 150 of a module.
 151
 152 Other flag-related blurb:
 153
 154 A list of {\em ToDo}s is things to be done in a particular part of
 155 processing.  A (fictitious) example for the Core-to-Core simplifier
 156 might be: run the simplifier, then run the strictness analyser, then
 157 run the simplifier again (three ``todos'').
 158
 159 There are three ``to-do processing centers'' at the moment.  In the
 160 main loop (\tr{main/Main.lhs}), in the Core-to-Core processing loop
 161 (\tr{simplCore/SimplCore.lhs), and in the STG-to-STG processing loop
 162 (\tr{simplStg/SimplStg.lhs}).
 163
 164 %************************************************************************
 165 %*                                                                      *
 166 \subsection{Datatypes associated with command-line options}
 167 %*                                                                      *
 168 %************************************************************************
 169
 170 \begin{code}
 171 data CoreToDo           -- These are diff core-to-core passes,
 172                         -- which may be invoked in any order,
 173                         -- as many times as you like.
 174
 175   = CoreDoSimplify      -- The core-to-core simplifier.
 176         SimplifierMode
 177         [SimplifierSwitch]
 178                         -- Each run of the simplifier can take a different
 179                         -- set of simplifier-specific flags.
 180   | CoreDoFloatInwards
 181   | CoreDoFloatOutwards FloatOutSwitches
 182   | CoreLiberateCase
 183   | CoreDoPrintCore
 184   | CoreDoStaticArgs
 185   | CoreDoStrictness
 186   | CoreDoWorkerWrapper
 187   | CoreDoSpecialising
 188   | CoreDoSpecConstr
 189   | CoreDoUSPInf
 190   | CoreDoOldStrictness
 191   | CoreDoGlomBinds
 192   | CoreCSE
 193   | CoreDoRuleCheck Int{-CompilerPhase-} String -- Check for non-application of rules
 194                                                 -- matching this string
 195
 196   | CoreDoNothing        -- useful when building up lists of these things
 197 \end{code}
 198
 199 \begin{code}
 200 data StgToDo
 201   = StgDoMassageForProfiling  -- should be (next to) last
 202   -- There's also setStgVarInfo, but its absolute "lastness"
 203   -- is so critical that it is hardwired in (no flag).
 204   | D_stg_stats
 205 \end{code}
 206
 207 \begin{code}
 208 data SimplifierMode             -- See comments in SimplMonad
 209   = SimplGently
 210   | SimplPhase Int
 211
 212 data SimplifierSwitch
 213   = MaxSimplifierIterations Int
 214   | NoCaseOfCase
 215
 216 data FloatOutSwitches
 217   = FloatOutSw  Bool    -- True <=> float lambdas to top level
 218                 Bool    -- True <=> float constants to top level,
 219                         --          even if they do not escape a lambda
 220 \end{code}
 221
 222 %************************************************************************
 223 %*                                                                      *
 224 \subsection{Dynamic command-line options}
 225 %*                                                                      *
 226 %************************************************************************
 227
 228 \begin{code}
 229 data DynFlag
 230
 231    -- debugging flags
 232    = Opt_D_dump_absC
 233    | Opt_D_dump_asm
 234    | Opt_D_dump_cpranal
 235    | Opt_D_dump_deriv
 236    | Opt_D_dump_ds
 237    | Opt_D_dump_flatC
 238    | Opt_D_dump_foreign
 239    | Opt_D_dump_inlinings
 240    | Opt_D_dump_occur_anal
 241    | Opt_D_dump_parsed
 242    | Opt_D_dump_realC
 243    | Opt_D_dump_rn
 244    | Opt_D_dump_simpl
 245    | Opt_D_dump_simpl_iterations
 246    | Opt_D_dump_spec
 247    | Opt_D_dump_prep
 248    | Opt_D_dump_stg
 249    | Opt_D_dump_stranal
 250    | Opt_D_dump_tc
 251    | Opt_D_dump_types
 252    | Opt_D_dump_rules
 253    | Opt_D_dump_usagesp
 254    | Opt_D_dump_cse
 255    | Opt_D_dump_worker_wrapper
 256    | Opt_D_dump_rn_trace
 257    | Opt_D_dump_rn_stats
 258    | Opt_D_dump_stix
 259    | Opt_D_dump_simpl_stats
 260    | Opt_D_dump_tc_trace
 261    | Opt_D_dump_BCOs
 262    | Opt_D_dump_vect
 263    | Opt_D_source_stats
 264    | Opt_D_verbose_core2core
 265    | Opt_D_verbose_stg2stg
 266    | Opt_D_dump_hi
 267    | Opt_D_dump_hi_diffs
 268    | Opt_D_dump_minimal_imports
 269    | Opt_DoCoreLinting
 270    | Opt_DoStgLinting
 271    | Opt_DoUSPLinting
 272
 273    | Opt_WarnDuplicateExports
 274    | Opt_WarnHiShadows
 275    | Opt_WarnIncompletePatterns
 276    | Opt_WarnMissingFields
 277    | Opt_WarnMissingMethods
 278    | Opt_WarnMissingSigs
 279    | Opt_WarnNameShadowing
 280    | Opt_WarnOverlappingPatterns
 281    | Opt_WarnSimplePatterns
 282    | Opt_WarnTypeDefaults
 283    | Opt_WarnUnusedBinds
 284    | Opt_WarnUnusedImports
 285    | Opt_WarnUnusedMatches
 286    | Opt_WarnDeprecations
 287    | Opt_WarnMisc
 288
 289    -- language opts
 290    | Opt_AllowOverlappingInstances
 291    | Opt_AllowUndecidableInstances
 292    | Opt_AllowIncoherentInstances
 293    | Opt_NoMonomorphismRestriction
 294    | Opt_GlasgowExts
 295    | Opt_FFI
 296    | Opt_PArr                          -- syntactic support for parallel arrays
 297    | Opt_With                          -- deprecated keyword for implicit parms
 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   | HscCore
 339   | HscInterpreted
 340   | HscNothing
 341     deriving (Eq, Show)
 342
 343 defaultHscLang
 344   | cGhcWithNativeCodeGen == "YES" &&
 345         (prefixMatch "i386" cTARGETPLATFORM ||
 346          prefixMatch "sparc" 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_FoldrBuildOn                = lookUp  FSLIT("-ffoldr-build-on")
 591 opt_CprOff                      = lookUp  FSLIT("-fcpr-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_UsageSPOn                   = lookUp  FSLIT("-fusagesp-on")
 597 opt_UnboxStrictFields           = lookUp  FSLIT("-funbox-strict-fields")
 598 opt_MaxWorkerArgs               = lookup_def_int "-fmax-worker-args" (10::Int)
 599
 600 {-
 601    The optional '-inpackage=P' flag tells what package
 602    we are compiling this module for.
 603    The Prelude, for example is compiled with '-inpackage std'
 604 -}
 605 opt_InPackage                   = case lookup_str "-inpackage=" of
 606                                     Just p  -> mkFastString p
 607                                     Nothing -> FSLIT("Main")    -- The package name if none is specified
 608
 609 opt_EmitCExternDecls            = lookUp  FSLIT("-femit-extern-decls")
 610 opt_EnsureSplittableC           = lookUp  FSLIT("-fglobalise-toplev-names")
 611 opt_GranMacros                  = lookUp  FSLIT("-fgransim")
 612 opt_HiVersion                   = read (cProjectVersionInt ++ cProjectPatchLevel) :: Int
 613 opt_HistorySize                 = lookup_def_int "-fhistory-size" 20
 614 opt_IgnoreAsserts               = lookUp  FSLIT("-fignore-asserts")
 615 opt_IgnoreIfacePragmas          = lookUp  FSLIT("-fignore-interface-pragmas")
 616 opt_NoHiCheck                   = lookUp  FSLIT("-fno-hi-version-check")
 617 opt_OmitBlackHoling             = lookUp  FSLIT("-dno-black-holing")
 618 opt_OmitInterfacePragmas        = lookUp  FSLIT("-fomit-interface-pragmas")
 619 opt_RuntimeTypes                = lookUp  FSLIT("-fruntime-types")
 620
 621 -- Simplifier switches
 622 opt_SimplNoPreInlining          = lookUp  FSLIT("-fno-pre-inlining")
 623         -- NoPreInlining is there just to see how bad things
 624         -- get if you don't do it!
 625 opt_SimplDoEtaReduction         = lookUp  FSLIT("-fdo-eta-reduction")
 626 opt_SimplDoLambdaEtaExpansion   = lookUp  FSLIT("-fdo-lambda-eta-expansion")
 627 opt_SimplCaseMerge              = lookUp  FSLIT("-fcase-merge")
 628 opt_SimplExcessPrecision        = lookUp  FSLIT("-fexcess-precision")
 629
 630 -- Unfolding control
 631 opt_UF_CreationThreshold        = lookup_def_int "-funfolding-creation-threshold"  (45::Int)
 632 opt_UF_UseThreshold             = lookup_def_int "-funfolding-use-threshold"       (8::Int)     -- Discounts can be big
 633 opt_UF_FunAppDiscount           = lookup_def_int "-funfolding-fun-discount"        (6::Int)     -- It's great to inline a fn
 634 opt_UF_KeenessFactor            = lookup_def_float "-funfolding-keeness-factor"    (1.5::Float)
 635 opt_UF_UpdateInPlace            = lookUp  FSLIT("-funfolding-update-in-place")
 636
 637 opt_UF_CheapOp  = ( 1 :: Int)   -- Only one instruction; and the args are charged for
 638 opt_UF_DearOp   = ( 4 :: Int)
 639
 640 opt_NoPruneDecls                = lookUp  FSLIT("-fno-prune-decls")
 641 opt_NoPruneTyDecls              = lookUp  FSLIT("-fno-prune-tydecls")
 642 opt_Static                      = lookUp  FSLIT("-static")
 643 opt_Unregisterised              = lookUp  FSLIT("-funregisterised")
 644 opt_EmitExternalCore            = lookUp  FSLIT("-fext-core")
 645 \end{code}
 646
 647 %************************************************************************
 648 %*                                                                      *
 649 \subsection{List of static hsc flags}
 650 %*                                                                      *
 651 %************************************************************************
 652
 653 \begin{code}
 654 isStaticHscFlag f =
 655   f `elem` [
 656         "fauto-sccs-on-all-toplevs",
 657         "fauto-sccs-on-exported-toplevs",
 658         "fauto-sccs-on-individual-cafs",
 659         "fauto-sccs-on-dicts",
 660         "fscc-profiling",
 661         "fticky-ticky",
 662         "fall-strict",
 663         "fdicts-strict",
 664         "firrefutable-tuples",
 665         "fnumbers-strict",
 666         "fparallel",
 667         "fsmp",
 668         "fflatten",
 669         "fsemi-tagging",
 670         "ffoldr-build-on",
 671         "flet-no-escape",
 672         "funfold-casms-in-hi-file",
 673         "fusagesp-on",
 674         "funbox-strict-fields",
 675         "femit-extern-decls",
 676         "fglobalise-toplev-names",
 677         "fgransim",
 678         "fignore-asserts",
 679         "fignore-interface-pragmas",
 680         "fno-hi-version-check",
 681         "dno-black-holing",
 682         "fno-method-sharing",
 683         "fomit-interface-pragmas",
 684         "fruntime-types",
 685         "fno-pre-inlining",
 686         "fdo-eta-reduction",
 687         "fdo-lambda-eta-expansion",
 688         "fcase-merge",
 689         "fexcess-precision",
 690         "funfolding-update-in-place",
 691         "fno-prune-decls",
 692         "fno-prune-tydecls",
 693         "static",
 694         "funregisterised",
 695         "fext-core",
 696         "frule-check",
 697         "fcpr-off"
 698         ]
 699   || any (flip prefixMatch f) [
 700         "fcontext-stack",
 701         "fliberate-case-threshold",
 702         "fmax-worker-args",
 703         "fhistory-size",
 704         "funfolding-creation-threshold",
 705         "funfolding-use-threshold",
 706         "funfolding-fun-discount",
 707         "funfolding-keeness-factor"
 708      ]
 709 \end{code}
 710
 711 %************************************************************************
 712 %*                                                                      *
 713 \subsection{Misc functions for command-line options}
 714 %*                                                                      *
 715 %************************************************************************
 716
 717
 718
 719 \begin{code}
 720 startsWith :: String -> String -> Maybe String
 721 -- startsWith pfx (pfx++rest) = Just rest
 722
 723 startsWith []     str = Just str
 724 startsWith (c:cs) (s:ss)
 725   = if c /= s then Nothing else startsWith cs ss
 726 startsWith  _     []  = Nothing
 727
 728 endsWith  :: String -> String -> Maybe String
 729 endsWith cs ss
 730   = case (startsWith (reverse cs) (reverse ss)) of
 731       Nothing -> Nothing
 732       Just rs -> Just (reverse rs)
 733 \end{code}