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