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_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_NoPruneTyDecls,
 111         opt_NoPruneDecls,
 112         opt_Static,
 113         opt_Unregisterised,
 114         opt_EmitExternalCore
 115     ) where
 116
 117 #include "HsVersions.h"
 118
 119 import Constants        -- Default values for some flags
 120 import Util
 121 import FastString       ( FastString, mkFastString )
 122 import Config
 123 import Maybes           ( firstJust )
 124
 125 import GLAEXTS
 126 import DATA_IOREF       ( IORef, readIORef, writeIORef )
 127 import UNSAFE_IO        ( unsafePerformIO )
 128 \end{code}
 129
 130 %************************************************************************
 131 %*                                                                      *
 132 \subsection{Command-line options}
 133 %*                                                                      *
 134 %************************************************************************
 135
 136 The hsc command-line options are split into two categories:
 137
 138   - static flags
 139   - dynamic flags
 140
 141 Static flags are represented by top-level values of type Bool or Int,
 142 for example.  They therefore have the same value throughout the
 143 invocation of hsc.
 144
 145 Dynamic flags are represented by an abstract type, DynFlags, which is
 146 passed into hsc by the compilation manager for every compilation.
 147 Dynamic flags are those that change on a per-compilation basis,
 148 perhaps because they may be present in the OPTIONS pragma at the top
 149 of a module.
 150
 151 Other flag-related blurb:
 152
 153 A list of {\em ToDo}s is things to be done in a particular part of
 154 processing.  A (fictitious) example for the Core-to-Core simplifier
 155 might be: run the simplifier, then run the strictness analyser, then
 156 run the simplifier again (three ``todos'').
 157
 158 There are three ``to-do processing centers'' at the moment.  In the
 159 main loop (\tr{main/Main.lhs}), in the Core-to-Core processing loop
 160 (\tr{simplCore/SimplCore.lhs), and in the STG-to-STG processing loop
 161 (\tr{simplStg/SimplStg.lhs}).
 162
 163 %************************************************************************
 164 %*                                                                      *
 165 \subsection{Datatypes associated with command-line options}
 166 %*                                                                      *
 167 %************************************************************************
 168
 169 \begin{code}
 170 data CoreToDo           -- These are diff core-to-core passes,
 171                         -- which may be invoked in any order,
 172                         -- as many times as you like.
 173
 174   = CoreDoSimplify      -- The core-to-core simplifier.
 175         SimplifierMode
 176         [SimplifierSwitch]
 177                         -- Each run of the simplifier can take a different
 178                         -- set of simplifier-specific flags.
 179   | CoreDoFloatInwards
 180   | CoreDoFloatOutwards FloatOutSwitches
 181   | CoreLiberateCase
 182   | CoreDoPrintCore
 183   | CoreDoStaticArgs
 184   | CoreDoStrictness
 185   | CoreDoWorkerWrapper
 186   | CoreDoSpecialising
 187   | CoreDoSpecConstr
 188   | CoreDoOldStrictness
 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_cse
 252    | Opt_D_dump_worker_wrapper
 253    | Opt_D_dump_rn_trace
 254    | Opt_D_dump_rn_stats
 255    | Opt_D_dump_stix
 256    | Opt_D_dump_simpl_stats
 257    | Opt_D_dump_tc_trace
 258    | Opt_D_dump_splices
 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
 270    | Opt_WarnIsError            -- -Werror; makes warnings fatal
 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_FFI
 294    | Opt_PArr                          -- syntactic support for parallel arrays
 295    | Opt_With                          -- deprecated keyword for implicit parms
 296    | Opt_Arrows                        -- Arrow-notation syntax
 297    | Opt_Generics
 298    | Opt_NoImplicitPrelude
 299
 300    deriving (Eq)
 301
 302 data DynFlags = DynFlags {
 303   coreToDo              :: [CoreToDo],
 304   stgToDo               :: [StgToDo],
 305   hscLang               :: HscLang,
 306   hscOutName            :: String,      -- name of the output file
 307   hscStubHOutName       :: String,      -- name of the .stub_h output file
 308   hscStubCOutName       :: String,      -- name of the .stub_c output file
 309   extCoreName           :: String,      -- name of the .core output file
 310   verbosity             :: Int,         -- verbosity level
 311   cppFlag               :: Bool,        -- preprocess with cpp?
 312   ppFlag                :: Bool,        -- preprocess with a Haskell Pp?
 313   stolen_x86_regs       :: Int,
 314   cmdlineHcIncludes     :: [String],    -- -#includes
 315
 316   -- options for particular phases
 317   opt_L                 :: [String],
 318   opt_P                 :: [String],
 319   opt_F                 :: [String],
 320   opt_c                 :: [String],
 321   opt_a                 :: [String],
 322   opt_m                 :: [String],
 323 #ifdef ILX
 324   opt_I                 :: [String],
 325   opt_i                 :: [String],
 326 #endif
 327
 328   -- hsc dynamic flags
 329   flags                 :: [DynFlag]
 330  }
 331
 332 data HscLang
 333   = HscC
 334   | HscAsm
 335   | HscJava
 336   | HscILX
 337   | HscInterpreted
 338   | HscNothing
 339     deriving (Eq, Show)
 340
 341 defaultHscLang
 342   | cGhcWithNativeCodeGen == "YES" &&
 343         (prefixMatch "i386" cTARGETPLATFORM ||
 344          prefixMatch "sparc" cTARGETPLATFORM ||
 345          prefixMatch "powerpc" 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_UnboxStrictFields           = lookUp  FSLIT("-funbox-strict-fields")
 596 opt_MaxWorkerArgs               = lookup_def_int "-fmax-worker-args" (10::Int)
 597
 598 {-
 599    The optional '-inpackage=P' flag tells what package
 600    we are compiling this module for.
 601    The Prelude, for example is compiled with '-inpackage std'
 602 -}
 603 opt_InPackage                   = case lookup_str "-inpackage=" of
 604                                     Just p  -> mkFastString p
 605                                     Nothing -> FSLIT("Main")    -- The package name if none is specified
 606
 607 opt_EmitCExternDecls            = lookUp  FSLIT("-femit-extern-decls")
 608 opt_EnsureSplittableC           = lookUp  FSLIT("-fglobalise-toplev-names")
 609 opt_GranMacros                  = lookUp  FSLIT("-fgransim")
 610 opt_HiVersion                   = read (cProjectVersionInt ++ cProjectPatchLevel) :: Int
 611 opt_HistorySize                 = lookup_def_int "-fhistory-size" 20
 612 opt_IgnoreAsserts               = lookUp  FSLIT("-fignore-asserts")
 613 opt_IgnoreIfacePragmas          = lookUp  FSLIT("-fignore-interface-pragmas")
 614 opt_NoHiCheck                   = lookUp  FSLIT("-fno-hi-version-check")
 615 opt_OmitBlackHoling             = lookUp  FSLIT("-dno-black-holing")
 616 opt_OmitInterfacePragmas        = lookUp  FSLIT("-fomit-interface-pragmas")
 617 opt_RuntimeTypes                = lookUp  FSLIT("-fruntime-types")
 618
 619 -- Simplifier switches
 620 opt_SimplNoPreInlining          = lookUp  FSLIT("-fno-pre-inlining")
 621         -- NoPreInlining is there just to see how bad things
 622         -- get if you don't do it!
 623 opt_SimplDoEtaReduction         = lookUp  FSLIT("-fdo-eta-reduction")
 624 opt_SimplDoLambdaEtaExpansion   = lookUp  FSLIT("-fdo-lambda-eta-expansion")
 625 opt_SimplCaseMerge              = lookUp  FSLIT("-fcase-merge")
 626 opt_SimplExcessPrecision        = lookUp  FSLIT("-fexcess-precision")
 627
 628 -- Unfolding control
 629 opt_UF_CreationThreshold        = lookup_def_int "-funfolding-creation-threshold"  (45::Int)
 630 opt_UF_UseThreshold             = lookup_def_int "-funfolding-use-threshold"       (8::Int)     -- Discounts can be big
 631 opt_UF_FunAppDiscount           = lookup_def_int "-funfolding-fun-discount"        (6::Int)     -- It's great to inline a fn
 632 opt_UF_KeenessFactor            = lookup_def_float "-funfolding-keeness-factor"    (1.5::Float)
 633 opt_UF_UpdateInPlace            = lookUp  FSLIT("-funfolding-update-in-place")
 634
 635 opt_UF_CheapOp  = ( 1 :: Int)   -- Only one instruction; and the args are charged for
 636 opt_UF_DearOp   = ( 4 :: Int)
 637
 638 opt_NoPruneDecls                = lookUp  FSLIT("-fno-prune-decls")
 639 opt_NoPruneTyDecls              = lookUp  FSLIT("-fno-prune-tydecls")
 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         "ffoldr-build-on",
 669         "flet-no-escape",
 670         "funfold-casms-in-hi-file",
 671         "funbox-strict-fields",
 672         "femit-extern-decls",
 673         "fglobalise-toplev-names",
 674         "fgransim",
 675         "fignore-asserts",
 676         "fignore-interface-pragmas",
 677         "fno-hi-version-check",
 678         "dno-black-holing",
 679         "fno-method-sharing",
 680         "fomit-interface-pragmas",
 681         "fruntime-types",
 682         "fno-pre-inlining",
 683         "fdo-eta-reduction",
 684         "fdo-lambda-eta-expansion",
 685         "fcase-merge",
 686         "fexcess-precision",
 687         "funfolding-update-in-place",
 688         "fno-prune-decls",
 689         "fno-prune-tydecls",
 690         "static",
 691         "funregisterised",
 692         "fext-core",
 693         "frule-check",
 694         "fcpr-off"
 695         ]
 696   || any (flip prefixMatch f) [
 697         "fcontext-stack",
 698         "fliberate-case-threshold",
 699         "fmax-worker-args",
 700         "fhistory-size",
 701         "funfolding-creation-threshold",
 702         "funfolding-use-threshold",
 703         "funfolding-fun-discount",
 704         "funfolding-keeness-factor"
 705      ]
 706 \end{code}
 707
 708 %************************************************************************
 709 %*                                                                      *
 710 \subsection{Misc functions for command-line options}
 711 %*                                                                      *
 712 %************************************************************************
 713
 714
 715
 716 \begin{code}
 717 startsWith :: String -> String -> Maybe String
 718 -- startsWith pfx (pfx++rest) = Just rest
 719
 720 startsWith []     str = Just str
 721 startsWith (c:cs) (s:ss)
 722   = if c /= s then Nothing else startsWith cs ss
 723 startsWith  _     []  = Nothing
 724
 725 endsWith  :: String -> String -> Maybe String
 726 endsWith cs ss
 727   = case (startsWith (reverse cs) (reverse ss)) of
 728       Nothing -> Nothing
 729       Just rs -> Just (reverse rs)
 730 \end{code}