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 = [Opt_Generics] ++ standardWarnings,
 368         -- Generating the helper-functions for
 369         -- generics is now on by default
 370   }
 371
 372 {-
 373     Verbosity levels:
 374
 375     0   |   print errors & warnings only
 376     1   |   minimal verbosity: print "compiling M ... done." for each module.
 377     2   |   equivalent to -dshow-passes
 378     3   |   equivalent to existing "ghc -v"
 379     4   |   "ghc -v -ddump-most"
 380     5   |   "ghc -v -ddump-all"
 381 -}
 382
 383 dopt :: DynFlag -> DynFlags -> Bool
 384 dopt f dflags  = f `elem` (flags dflags)
 385
 386 dopt_CoreToDo :: DynFlags -> [CoreToDo]
 387 dopt_CoreToDo = coreToDo
 388
 389 dopt_StgToDo :: DynFlags -> [StgToDo]
 390 dopt_StgToDo = stgToDo
 391
 392 dopt_OutName :: DynFlags -> String
 393 dopt_OutName = hscOutName
 394
 395 dopt_HscLang :: DynFlags -> HscLang
 396 dopt_HscLang = hscLang
 397
 398 dopt_set :: DynFlags -> DynFlag -> DynFlags
 399 dopt_set dfs f = dfs{ flags = f : flags dfs }
 400
 401 dopt_unset :: DynFlags -> DynFlag -> DynFlags
 402 dopt_unset dfs f = dfs{ flags = filter (/= f) (flags dfs) }
 403
 404 getOpts :: (DynFlags -> [a]) -> IO [a]
 405         -- We add to the options from the front, so we need to reverse the list
 406 getOpts opts = dynFlag opts >>= return . reverse
 407
 408 -- we can only switch between HscC, HscAsmm, and HscILX with dynamic flags
 409 -- (-fvia-C, -fasm, -filx respectively).
 410 setLang l = updDynFlags (\ dfs -> case hscLang dfs of
 411                                         HscC   -> dfs{ hscLang = l }
 412                                         HscAsm -> dfs{ hscLang = l }
 413                                         HscILX -> dfs{ hscLang = l }
 414                                         _      -> dfs)
 415
 416 getVerbFlag = do
 417    verb <- dynFlag verbosity
 418    if verb >= 3  then return  "-v" else return ""
 419 \end{code}
 420
 421 -----------------------------------------------------------------------------
 422 -- Mess about with the mutable variables holding the dynamic arguments
 423
 424 -- v_InitDynFlags
 425 --      is the "baseline" dynamic flags, initialised from
 426 --      the defaults and command line options, and updated by the
 427 --      ':s' command in GHCi.
 428 --
 429 -- v_DynFlags
 430 --      is the dynamic flags for the current compilation.  It is reset
 431 --      to the value of v_InitDynFlags before each compilation, then
 432 --      updated by reading any OPTIONS pragma in the current module.
 433
 434 \begin{code}
 435 GLOBAL_VAR(v_InitDynFlags, defaultDynFlags, DynFlags)
 436 GLOBAL_VAR(v_DynFlags,     defaultDynFlags, DynFlags)
 437
 438 setDynFlags :: DynFlags -> IO ()
 439 setDynFlags dfs = writeIORef v_DynFlags dfs
 440
 441 saveDynFlags :: IO ()
 442 saveDynFlags = do dfs <- readIORef v_DynFlags
 443                   writeIORef v_InitDynFlags dfs
 444
 445 restoreDynFlags :: IO DynFlags
 446 restoreDynFlags = do dfs <- readIORef v_InitDynFlags
 447                      writeIORef v_DynFlags dfs
 448                      return dfs
 449
 450 getDynFlags :: IO DynFlags
 451 getDynFlags = readIORef v_DynFlags
 452
 453 updDynFlags :: (DynFlags -> DynFlags) -> IO ()
 454 updDynFlags f = do dfs <- readIORef v_DynFlags
 455                    writeIORef v_DynFlags (f dfs)
 456
 457 dynFlag :: (DynFlags -> a) -> IO a
 458 dynFlag f = do dflags <- readIORef v_DynFlags; return (f dflags)
 459
 460 setDynFlag, unSetDynFlag :: DynFlag -> IO ()
 461 setDynFlag f   = updDynFlags (\dfs -> dopt_set dfs f)
 462 unSetDynFlag f = updDynFlags (\dfs -> dopt_unset dfs f)
 463 \end{code}
 464
 465
 466 %************************************************************************
 467 %*                                                                      *
 468 \subsection{Warnings}
 469 %*                                                                      *
 470 %************************************************************************
 471
 472 \begin{code}
 473 standardWarnings
 474     = [ Opt_WarnDeprecations,
 475         Opt_WarnOverlappingPatterns,
 476         Opt_WarnMissingFields,
 477         Opt_WarnMissingMethods,
 478         Opt_WarnDuplicateExports
 479       ]
 480
 481 minusWOpts
 482     = standardWarnings ++
 483       [ Opt_WarnUnusedBinds,
 484         Opt_WarnUnusedMatches,
 485         Opt_WarnUnusedImports,
 486         Opt_WarnIncompletePatterns,
 487         Opt_WarnMisc
 488       ]
 489
 490 minusWallOpts
 491     = minusWOpts ++
 492       [ Opt_WarnTypeDefaults,
 493         Opt_WarnNameShadowing,
 494         Opt_WarnMissingSigs,
 495         Opt_WarnHiShadows
 496       ]
 497 \end{code}
 498
 499 %************************************************************************
 500 %*                                                                      *
 501 \subsection{Classifying command-line options}
 502 %*                                                                      *
 503 %************************************************************************
 504
 505 \begin{code}
 506 -- v_Statis_hsc_opts is here to avoid a circular dependency with
 507 -- main/DriverState.
 508 GLOBAL_VAR(v_Static_hsc_opts, [], [String])
 509
 510 lookUp           :: FastString -> Bool
 511 lookup_int       :: String -> Maybe Int
 512 lookup_def_int   :: String -> Int -> Int
 513 lookup_def_float :: String -> Float -> Float
 514 lookup_str       :: String -> Maybe String
 515
 516 unpacked_static_opts = unsafePerformIO (readIORef v_Static_hsc_opts)
 517 packed_static_opts   = map mkFastString unpacked_static_opts
 518
 519 lookUp     sw = sw `elem` packed_static_opts
 520
 521 lookup_str sw = firstJust (map (startsWith sw) unpacked_static_opts)
 522
 523 lookup_int sw = case (lookup_str sw) of
 524                   Nothing -> Nothing
 525                   Just xx -> Just (read xx)
 526
 527 lookup_def_int sw def = case (lookup_str sw) of
 528                             Nothing -> def              -- Use default
 529                             Just xx -> read xx
 530
 531 lookup_def_float sw def = case (lookup_str sw) of
 532                             Nothing -> def              -- Use default
 533                             Just xx -> read xx
 534
 535
 536 {-
 537  Putting the compiler options into temporary at-files
 538  may turn out to be necessary later on if we turn hsc into
 539  a pure Win32 application where I think there's a command-line
 540  length limit of 255. unpacked_opts understands the @ option.
 541
 542 unpacked_opts :: [String]
 543 unpacked_opts =
 544   concat $
 545   map (expandAts) $
 546   map _UNPK_ argv  -- NOT ARGV any more: v_Static_hsc_opts
 547   where
 548    expandAts ('@':fname) = words (unsafePerformIO (readFile fname))
 549    expandAts l = [l]
 550 -}
 551 \end{code}
 552
 553 %************************************************************************
 554 %*                                                                      *
 555 \subsection{Static options}
 556 %*                                                                      *
 557 %************************************************************************
 558
 559 \begin{code}
 560 -- debugging opts
 561 opt_PprStyle_NoPrags            = lookUp  FSLIT("-dppr-noprags")
 562 opt_PprStyle_Debug              = lookUp  FSLIT("-dppr-debug")
 563 opt_PprStyle_RawTypes           = lookUp  FSLIT("-dppr-rawtypes")
 564 opt_PprUserLength               = lookup_def_int "-dppr-user-length" 5 --ToDo: give this a name
 565
 566 -- profiling opts
 567 opt_AutoSccsOnAllToplevs        = lookUp  FSLIT("-fauto-sccs-on-all-toplevs")
 568 opt_AutoSccsOnExportedToplevs   = lookUp  FSLIT("-fauto-sccs-on-exported-toplevs")
 569 opt_AutoSccsOnIndividualCafs    = lookUp  FSLIT("-fauto-sccs-on-individual-cafs")
 570 opt_AutoSccsOnDicts             = lookUp  FSLIT("-fauto-sccs-on-dicts")
 571 opt_SccProfilingOn              = lookUp  FSLIT("-fscc-profiling")
 572 opt_DoTickyProfiling            = lookUp  FSLIT("-fticky-ticky")
 573
 574 -- language opts
 575 opt_AllStrict                   = lookUp  FSLIT("-fall-strict")
 576 opt_DictsStrict                 = lookUp  FSLIT("-fdicts-strict")
 577 opt_IrrefutableTuples           = lookUp  FSLIT("-firrefutable-tuples")
 578 opt_MaxContextReductionDepth    = lookup_def_int "-fcontext-stack" mAX_CONTEXT_REDUCTION_DEPTH
 579 opt_NumbersStrict               = lookUp  FSLIT("-fnumbers-strict")
 580 opt_Parallel                    = lookUp  FSLIT("-fparallel")
 581 opt_SMP                         = lookUp  FSLIT("-fsmp")
 582 opt_Flatten                     = lookUp  FSLIT("-fflatten")
 583
 584 -- optimisation opts
 585 opt_NoMethodSharing             = lookUp  FSLIT("-fno-method-sharing")
 586 opt_DoSemiTagging               = lookUp  FSLIT("-fsemi-tagging")
 587 opt_FoldrBuildOn                = lookUp  FSLIT("-ffoldr-build-on")
 588 opt_LiberateCaseThreshold       = lookup_def_int "-fliberate-case-threshold" (10::Int)
 589 opt_StgDoLetNoEscapes           = lookUp  FSLIT("-flet-no-escape")
 590 opt_UnfoldCasms                 = lookUp  FSLIT("-funfold-casms-in-hi-file")
 591 opt_UsageSPOn                   = lookUp  FSLIT("-fusagesp-on")
 592 opt_UnboxStrictFields           = lookUp  FSLIT("-funbox-strict-fields")
 593 opt_MaxWorkerArgs               = lookup_def_int "-fmax-worker-args" (10::Int)
 594
 595 {-
 596    The optional '-inpackage=P' flag tells what package
 597    we are compiling this module for.
 598    The Prelude, for example is compiled with '-inpackage std'
 599 -}
 600 opt_InPackage                   = case lookup_str "-inpackage=" of
 601                                     Just p  -> _PK_ p
 602                                     Nothing -> FSLIT("Main")    -- The package name if none is specified
 603
 604 opt_EmitCExternDecls            = lookUp  FSLIT("-femit-extern-decls")
 605 opt_EnsureSplittableC           = lookUp  FSLIT("-fglobalise-toplev-names")
 606 opt_GranMacros                  = lookUp  FSLIT("-fgransim")
 607 opt_HiVersion                   = read (cProjectVersionInt ++ cProjectPatchLevel) :: Int
 608 opt_HistorySize                 = lookup_def_int "-fhistory-size" 20
 609 opt_IgnoreAsserts               = lookUp  FSLIT("-fignore-asserts")
 610 opt_IgnoreIfacePragmas          = lookUp  FSLIT("-fignore-interface-pragmas")
 611 opt_NoHiCheck                   = lookUp  FSLIT("-fno-hi-version-check")
 612 opt_OmitBlackHoling             = lookUp  FSLIT("-dno-black-holing")
 613 opt_OmitInterfacePragmas        = lookUp  FSLIT("-fomit-interface-pragmas")
 614 opt_RuntimeTypes                = lookUp  FSLIT("-fruntime-types")
 615
 616 -- Simplifier switches
 617 opt_SimplNoPreInlining          = lookUp  FSLIT("-fno-pre-inlining")
 618         -- NoPreInlining is there just to see how bad things
 619         -- get if you don't do it!
 620 opt_SimplDoEtaReduction         = lookUp  FSLIT("-fdo-eta-reduction")
 621 opt_SimplDoLambdaEtaExpansion   = lookUp  FSLIT("-fdo-lambda-eta-expansion")
 622 opt_SimplCaseMerge              = lookUp  FSLIT("-fcase-merge")
 623 opt_SimplExcessPrecision        = lookUp  FSLIT("-fexcess-precision")
 624
 625 -- Unfolding control
 626 opt_UF_CreationThreshold        = lookup_def_int "-funfolding-creation-threshold"  (45::Int)
 627 opt_UF_UseThreshold             = lookup_def_int "-funfolding-use-threshold"       (8::Int)     -- Discounts can be big
 628 opt_UF_FunAppDiscount           = lookup_def_int "-funfolding-fun-discount"        (6::Int)     -- It's great to inline a fn
 629 opt_UF_KeenessFactor            = lookup_def_float "-funfolding-keeness-factor"    (1.5::Float)
 630 opt_UF_UpdateInPlace            = lookUp  FSLIT("-funfolding-update-in-place")
 631
 632 opt_UF_CheapOp  = ( 1 :: Int)   -- Only one instruction; and the args are charged for
 633 opt_UF_DearOp   = ( 4 :: Int)
 634
 635 opt_NoPruneDecls                = lookUp  FSLIT("-fno-prune-decls")
 636 opt_NoPruneTyDecls              = lookUp  FSLIT("-fno-prune-tydecls")
 637 opt_Static                      = lookUp  FSLIT("-static")
 638 opt_Unregisterised              = lookUp  FSLIT("-funregisterised")
 639 opt_EmitExternalCore            = lookUp  FSLIT("-fext-core")
 640 \end{code}
 641
 642 %************************************************************************
 643 %*                                                                      *
 644 \subsection{List of static hsc flags}
 645 %*                                                                      *
 646 %************************************************************************
 647
 648 \begin{code}
 649 isStaticHscFlag f =
 650   f `elem` [
 651         "fauto-sccs-on-all-toplevs",
 652         "fauto-sccs-on-exported-toplevs",
 653         "fauto-sccs-on-individual-cafs",
 654         "fauto-sccs-on-dicts",
 655         "fscc-profiling",
 656         "fticky-ticky",
 657         "fall-strict",
 658         "fdicts-strict",
 659         "firrefutable-tuples",
 660         "fnumbers-strict",
 661         "fparallel",
 662         "fsmp",
 663         "fflatten",
 664         "fsemi-tagging",
 665         "ffoldr-build-on",
 666         "flet-no-escape",
 667         "funfold-casms-in-hi-file",
 668         "fusagesp-on",
 669         "funbox-strict-fields",
 670         "femit-extern-decls",
 671         "fglobalise-toplev-names",
 672         "fgransim",
 673         "fignore-asserts",
 674         "fignore-interface-pragmas",
 675         "fno-hi-version-check",
 676         "dno-black-holing",
 677         "fno-method-sharing",
 678         "fomit-interface-pragmas",
 679         "fruntime-types",
 680         "fno-pre-inlining",
 681         "fdo-eta-reduction",
 682         "fdo-lambda-eta-expansion",
 683         "fcase-merge",
 684         "fexcess-precision",
 685         "funfolding-update-in-place",
 686         "fno-prune-decls",
 687         "fno-prune-tydecls",
 688         "static",
 689         "funregisterised",
 690         "fext-core",
 691         "frule-check"
 692         ]
 693   || any (flip prefixMatch f) [
 694         "fcontext-stack",
 695         "fliberate-case-threshold",
 696         "fmax-worker-args",
 697         "fhistory-size",
 698         "funfolding-creation-threshold",
 699         "funfolding-use-threshold",
 700         "funfolding-fun-discount",
 701         "funfolding-keeness-factor"
 702      ]
 703 \end{code}
 704
 705 %************************************************************************
 706 %*                                                                      *
 707 \subsection{Misc functions for command-line options}
 708 %*                                                                      *
 709 %************************************************************************
 710
 711
 712
 713 \begin{code}
 714 startsWith :: String -> String -> Maybe String
 715 -- startsWith pfx (pfx++rest) = Just rest
 716
 717 startsWith []     str = Just str
 718 startsWith (c:cs) (s:ss)
 719   = if c /= s then Nothing else startsWith cs ss
 720 startsWith  _     []  = Nothing
 721
 722 endsWith  :: String -> String -> Maybe String
 723 endsWith cs ss
 724   = case (startsWith (reverse cs) (reverse ss)) of
 725       Nothing -> Nothing
 726       Just rs -> Just (reverse rs)
 727 \end{code}