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   | HscInterpreted
 339   | HscNothing
 340     deriving (Eq, Show)
 341
 342 defaultHscLang
 343   | cGhcWithNativeCodeGen == "YES" &&
 344         (prefixMatch "i386" cTARGETPLATFORM ||
 345          prefixMatch "sparc" cTARGETPLATFORM)   =  HscAsm
 346   | otherwise                                   =  HscC
 347
 348 defaultDynFlags = DynFlags {
 349   coreToDo = [], stgToDo = [],
 350   hscLang = defaultHscLang,
 351   hscOutName = "",
 352   hscStubHOutName = "", hscStubCOutName = "",
 353   extCoreName = "",
 354   verbosity = 0,
 355   cppFlag               = False,
 356   ppFlag                = False,
 357   stolen_x86_regs       = 4,
 358   cmdlineHcIncludes     = [],
 359   opt_L                 = [],
 360   opt_P                 = [],
 361   opt_F                 = [],
 362   opt_c                 = [],
 363   opt_a                 = [],
 364   opt_m                 = [],
 365 #ifdef ILX
 366   opt_I                 = [],
 367   opt_i                 = [],
 368 #endif
 369   flags = [Opt_Generics] ++ standardWarnings,
 370         -- Generating the helper-functions for
 371         -- generics is now on by default
 372   }
 373
 374 {-
 375     Verbosity levels:
 376
 377     0   |   print errors & warnings only
 378     1   |   minimal verbosity: print "compiling M ... done." for each module.
 379     2   |   equivalent to -dshow-passes
 380     3   |   equivalent to existing "ghc -v"
 381     4   |   "ghc -v -ddump-most"
 382     5   |   "ghc -v -ddump-all"
 383 -}
 384
 385 dopt :: DynFlag -> DynFlags -> Bool
 386 dopt f dflags  = f `elem` (flags dflags)
 387
 388 dopt_CoreToDo :: DynFlags -> [CoreToDo]
 389 dopt_CoreToDo = coreToDo
 390
 391 dopt_StgToDo :: DynFlags -> [StgToDo]
 392 dopt_StgToDo = stgToDo
 393
 394 dopt_OutName :: DynFlags -> String
 395 dopt_OutName = hscOutName
 396
 397 dopt_HscLang :: DynFlags -> HscLang
 398 dopt_HscLang = hscLang
 399
 400 dopt_set :: DynFlags -> DynFlag -> DynFlags
 401 dopt_set dfs f = dfs{ flags = f : flags dfs }
 402
 403 dopt_unset :: DynFlags -> DynFlag -> DynFlags
 404 dopt_unset dfs f = dfs{ flags = filter (/= f) (flags dfs) }
 405
 406 getOpts :: (DynFlags -> [a]) -> IO [a]
 407         -- We add to the options from the front, so we need to reverse the list
 408 getOpts opts = dynFlag opts >>= return . reverse
 409
 410 -- we can only switch between HscC, HscAsmm, and HscILX with dynamic flags
 411 -- (-fvia-C, -fasm, -filx respectively).
 412 setLang l = updDynFlags (\ dfs -> case hscLang dfs of
 413                                         HscC   -> dfs{ hscLang = l }
 414                                         HscAsm -> dfs{ hscLang = l }
 415                                         HscILX -> dfs{ hscLang = l }
 416                                         _      -> dfs)
 417
 418 getVerbFlag = do
 419    verb <- dynFlag verbosity
 420    if verb >= 3  then return  "-v" else return ""
 421 \end{code}
 422
 423 -----------------------------------------------------------------------------
 424 -- Mess about with the mutable variables holding the dynamic arguments
 425
 426 -- v_InitDynFlags
 427 --      is the "baseline" dynamic flags, initialised from
 428 --      the defaults and command line options, and updated by the
 429 --      ':s' command in GHCi.
 430 --
 431 -- v_DynFlags
 432 --      is the dynamic flags for the current compilation.  It is reset
 433 --      to the value of v_InitDynFlags before each compilation, then
 434 --      updated by reading any OPTIONS pragma in the current module.
 435
 436 \begin{code}
 437 GLOBAL_VAR(v_InitDynFlags, defaultDynFlags, DynFlags)
 438 GLOBAL_VAR(v_DynFlags,     defaultDynFlags, DynFlags)
 439
 440 setDynFlags :: DynFlags -> IO ()
 441 setDynFlags dfs = writeIORef v_DynFlags dfs
 442
 443 saveDynFlags :: IO ()
 444 saveDynFlags = do dfs <- readIORef v_DynFlags
 445                   writeIORef v_InitDynFlags dfs
 446
 447 restoreDynFlags :: IO DynFlags
 448 restoreDynFlags = do dfs <- readIORef v_InitDynFlags
 449                      writeIORef v_DynFlags dfs
 450                      return dfs
 451
 452 getDynFlags :: IO DynFlags
 453 getDynFlags = readIORef v_DynFlags
 454
 455 updDynFlags :: (DynFlags -> DynFlags) -> IO ()
 456 updDynFlags f = do dfs <- readIORef v_DynFlags
 457                    writeIORef v_DynFlags (f dfs)
 458
 459 dynFlag :: (DynFlags -> a) -> IO a
 460 dynFlag f = do dflags <- readIORef v_DynFlags; return (f dflags)
 461
 462 setDynFlag, unSetDynFlag :: DynFlag -> IO ()
 463 setDynFlag f   = updDynFlags (\dfs -> dopt_set dfs f)
 464 unSetDynFlag f = updDynFlags (\dfs -> dopt_unset dfs f)
 465 \end{code}
 466
 467
 468 %************************************************************************
 469 %*                                                                      *
 470 \subsection{Warnings}
 471 %*                                                                      *
 472 %************************************************************************
 473
 474 \begin{code}
 475 standardWarnings
 476     = [ Opt_WarnDeprecations,
 477         Opt_WarnOverlappingPatterns,
 478         Opt_WarnMissingFields,
 479         Opt_WarnMissingMethods,
 480         Opt_WarnDuplicateExports
 481       ]
 482
 483 minusWOpts
 484     = standardWarnings ++
 485       [ Opt_WarnUnusedBinds,
 486         Opt_WarnUnusedMatches,
 487         Opt_WarnUnusedImports,
 488         Opt_WarnIncompletePatterns,
 489         Opt_WarnMisc
 490       ]
 491
 492 minusWallOpts
 493     = minusWOpts ++
 494       [ Opt_WarnTypeDefaults,
 495         Opt_WarnNameShadowing,
 496         Opt_WarnMissingSigs,
 497         Opt_WarnHiShadows
 498       ]
 499 \end{code}
 500
 501 %************************************************************************
 502 %*                                                                      *
 503 \subsection{Classifying command-line options}
 504 %*                                                                      *
 505 %************************************************************************
 506
 507 \begin{code}
 508 -- v_Statis_hsc_opts is here to avoid a circular dependency with
 509 -- main/DriverState.
 510 GLOBAL_VAR(v_Static_hsc_opts, [], [String])
 511
 512 lookUp           :: FastString -> Bool
 513 lookup_int       :: String -> Maybe Int
 514 lookup_def_int   :: String -> Int -> Int
 515 lookup_def_float :: String -> Float -> Float
 516 lookup_str       :: String -> Maybe String
 517
 518 unpacked_static_opts = unsafePerformIO (readIORef v_Static_hsc_opts)
 519 packed_static_opts   = map mkFastString unpacked_static_opts
 520
 521 lookUp     sw = sw `elem` packed_static_opts
 522
 523 lookup_str sw = firstJust (map (startsWith sw) unpacked_static_opts)
 524
 525 lookup_int sw = case (lookup_str sw) of
 526                   Nothing -> Nothing
 527                   Just xx -> Just (read xx)
 528
 529 lookup_def_int sw def = case (lookup_str sw) of
 530                             Nothing -> def              -- Use default
 531                             Just xx -> read xx
 532
 533 lookup_def_float sw def = case (lookup_str sw) of
 534                             Nothing -> def              -- Use default
 535                             Just xx -> read xx
 536
 537
 538 {-
 539  Putting the compiler options into temporary at-files
 540  may turn out to be necessary later on if we turn hsc into
 541  a pure Win32 application where I think there's a command-line
 542  length limit of 255. unpacked_opts understands the @ option.
 543
 544 unpacked_opts :: [String]
 545 unpacked_opts =
 546   concat $
 547   map (expandAts) $
 548   map unpackFS argv  -- NOT ARGV any more: v_Static_hsc_opts
 549   where
 550    expandAts ('@':fname) = words (unsafePerformIO (readFile fname))
 551    expandAts l = [l]
 552 -}
 553 \end{code}
 554
 555 %************************************************************************
 556 %*                                                                      *
 557 \subsection{Static options}
 558 %*                                                                      *
 559 %************************************************************************
 560
 561 \begin{code}
 562 -- debugging opts
 563 opt_PprStyle_NoPrags            = lookUp  FSLIT("-dppr-noprags")
 564 opt_PprStyle_Debug              = lookUp  FSLIT("-dppr-debug")
 565 opt_PprStyle_RawTypes           = lookUp  FSLIT("-dppr-rawtypes")
 566 opt_PprUserLength               = lookup_def_int "-dppr-user-length" 5 --ToDo: give this a name
 567
 568 -- profiling opts
 569 opt_AutoSccsOnAllToplevs        = lookUp  FSLIT("-fauto-sccs-on-all-toplevs")
 570 opt_AutoSccsOnExportedToplevs   = lookUp  FSLIT("-fauto-sccs-on-exported-toplevs")
 571 opt_AutoSccsOnIndividualCafs    = lookUp  FSLIT("-fauto-sccs-on-individual-cafs")
 572 opt_AutoSccsOnDicts             = lookUp  FSLIT("-fauto-sccs-on-dicts")
 573 opt_SccProfilingOn              = lookUp  FSLIT("-fscc-profiling")
 574 opt_DoTickyProfiling            = lookUp  FSLIT("-fticky-ticky")
 575
 576 -- language opts
 577 opt_AllStrict                   = lookUp  FSLIT("-fall-strict")
 578 opt_DictsStrict                 = lookUp  FSLIT("-fdicts-strict")
 579 opt_IrrefutableTuples           = lookUp  FSLIT("-firrefutable-tuples")
 580 opt_MaxContextReductionDepth    = lookup_def_int "-fcontext-stack" mAX_CONTEXT_REDUCTION_DEPTH
 581 opt_NumbersStrict               = lookUp  FSLIT("-fnumbers-strict")
 582 opt_Parallel                    = lookUp  FSLIT("-fparallel")
 583 opt_SMP                         = lookUp  FSLIT("-fsmp")
 584 opt_Flatten                     = lookUp  FSLIT("-fflatten")
 585
 586 -- optimisation opts
 587 opt_NoMethodSharing             = lookUp  FSLIT("-fno-method-sharing")
 588 opt_DoSemiTagging               = lookUp  FSLIT("-fsemi-tagging")
 589 opt_FoldrBuildOn                = lookUp  FSLIT("-ffoldr-build-on")
 590 opt_CprOff                      = lookUp  FSLIT("-fcpr-off")
 591         -- Switch off CPR analysis in the new demand analyser
 592 opt_LiberateCaseThreshold       = lookup_def_int "-fliberate-case-threshold" (10::Int)
 593 opt_StgDoLetNoEscapes           = lookUp  FSLIT("-flet-no-escape")
 594 opt_UnfoldCasms                 = lookUp  FSLIT("-funfold-casms-in-hi-file")
 595 opt_UsageSPOn                   = lookUp  FSLIT("-fusagesp-on")
 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_NoPruneTyDecls              = lookUp  FSLIT("-fno-prune-tydecls")
 641 opt_Static                      = lookUp  FSLIT("-static")
 642 opt_Unregisterised              = lookUp  FSLIT("-funregisterised")
 643 opt_EmitExternalCore            = lookUp  FSLIT("-fext-core")
 644 \end{code}
 645
 646 %************************************************************************
 647 %*                                                                      *
 648 \subsection{List of static hsc flags}
 649 %*                                                                      *
 650 %************************************************************************
 651
 652 \begin{code}
 653 isStaticHscFlag f =
 654   f `elem` [
 655         "fauto-sccs-on-all-toplevs",
 656         "fauto-sccs-on-exported-toplevs",
 657         "fauto-sccs-on-individual-cafs",
 658         "fauto-sccs-on-dicts",
 659         "fscc-profiling",
 660         "fticky-ticky",
 661         "fall-strict",
 662         "fdicts-strict",
 663         "firrefutable-tuples",
 664         "fnumbers-strict",
 665         "fparallel",
 666         "fsmp",
 667         "fflatten",
 668         "fsemi-tagging",
 669         "ffoldr-build-on",
 670         "flet-no-escape",
 671         "funfold-casms-in-hi-file",
 672         "fusagesp-on",
 673         "funbox-strict-fields",
 674         "femit-extern-decls",
 675         "fglobalise-toplev-names",
 676         "fgransim",
 677         "fignore-asserts",
 678         "fignore-interface-pragmas",
 679         "fno-hi-version-check",
 680         "dno-black-holing",
 681         "fno-method-sharing",
 682         "fomit-interface-pragmas",
 683         "fruntime-types",
 684         "fno-pre-inlining",
 685         "fdo-eta-reduction",
 686         "fdo-lambda-eta-expansion",
 687         "fcase-merge",
 688         "fexcess-precision",
 689         "funfolding-update-in-place",
 690         "fno-prune-decls",
 691         "fno-prune-tydecls",
 692         "static",
 693         "funregisterised",
 694         "fext-core",
 695         "frule-check",
 696         "fcpr-off"
 697         ]
 698   || any (flip prefixMatch f) [
 699         "fcontext-stack",
 700         "fliberate-case-threshold",
 701         "fmax-worker-args",
 702         "fhistory-size",
 703         "funfolding-creation-threshold",
 704         "funfolding-use-threshold",
 705         "funfolding-fun-discount",
 706         "funfolding-keeness-factor"
 707      ]
 708 \end{code}
 709
 710 %************************************************************************
 711 %*                                                                      *
 712 \subsection{Misc functions for command-line options}
 713 %*                                                                      *
 714 %************************************************************************
 715
 716
 717
 718 \begin{code}
 719 startsWith :: String -> String -> Maybe String
 720 -- startsWith pfx (pfx++rest) = Just rest
 721
 722 startsWith []     str = Just str
 723 startsWith (c:cs) (s:ss)
 724   = if c /= s then Nothing else startsWith cs ss
 725 startsWith  _     []  = Nothing
 726
 727 endsWith  :: String -> String -> Maybe String
 728 endsWith cs ss
 729   = case (startsWith (reverse cs) (reverse ss)) of
 730       Nothing -> Nothing
 731       Just rs -> Just (reverse rs)
 732 \end{code}