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 Constants        -- Default values for some flags
 121 import Util
 122 import FastString       ( FastString, mkFastString )
 123 import Config
 124 import Maybes           ( firstJust )
 125
 126 import GLAEXTS
 127 import DATA_IOREF       ( IORef, readIORef, writeIORef )
 128 import UNSAFE_IO        ( unsafePerformIO )
 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_splices
 262    | Opt_D_dump_BCOs
 263    | Opt_D_dump_vect
 264    | Opt_D_source_stats
 265    | Opt_D_verbose_core2core
 266    | Opt_D_verbose_stg2stg
 267    | Opt_D_dump_hi
 268    | Opt_D_dump_hi_diffs
 269    | Opt_D_dump_minimal_imports
 270    | Opt_DoCoreLinting
 271    | Opt_DoStgLinting
 272    | Opt_DoUSPLinting
 273
 274    | Opt_WarnIsError            -- -Werror; makes warnings fatal
 275    | Opt_WarnDuplicateExports
 276    | Opt_WarnHiShadows
 277    | Opt_WarnIncompletePatterns
 278    | Opt_WarnMissingFields
 279    | Opt_WarnMissingMethods
 280    | Opt_WarnMissingSigs
 281    | Opt_WarnNameShadowing
 282    | Opt_WarnOverlappingPatterns
 283    | Opt_WarnSimplePatterns
 284    | Opt_WarnTypeDefaults
 285    | Opt_WarnUnusedBinds
 286    | Opt_WarnUnusedImports
 287    | Opt_WarnUnusedMatches
 288    | Opt_WarnDeprecations
 289    | Opt_WarnMisc
 290
 291    -- language opts
 292    | Opt_AllowOverlappingInstances
 293    | Opt_AllowUndecidableInstances
 294    | Opt_AllowIncoherentInstances
 295    | Opt_NoMonomorphismRestriction
 296    | Opt_GlasgowExts
 297    | Opt_FFI
 298    | Opt_PArr                          -- syntactic support for parallel arrays
 299    | Opt_With                          -- deprecated keyword for implicit parms
 300    | Opt_Generics
 301    | Opt_NoImplicitPrelude
 302
 303    deriving (Eq)
 304
 305 data DynFlags = DynFlags {
 306   coreToDo              :: [CoreToDo],
 307   stgToDo               :: [StgToDo],
 308   hscLang               :: HscLang,
 309   hscOutName            :: String,      -- name of the output file
 310   hscStubHOutName       :: String,      -- name of the .stub_h output file
 311   hscStubCOutName       :: String,      -- name of the .stub_c output file
 312   extCoreName           :: String,      -- name of the .core output file
 313   verbosity             :: Int,         -- verbosity level
 314   cppFlag               :: Bool,        -- preprocess with cpp?
 315   ppFlag                :: Bool,        -- preprocess with a Haskell Pp?
 316   stolen_x86_regs       :: Int,
 317   cmdlineHcIncludes     :: [String],    -- -#includes
 318
 319   -- options for particular phases
 320   opt_L                 :: [String],
 321   opt_P                 :: [String],
 322   opt_F                 :: [String],
 323   opt_c                 :: [String],
 324   opt_a                 :: [String],
 325   opt_m                 :: [String],
 326 #ifdef ILX
 327   opt_I                 :: [String],
 328   opt_i                 :: [String],
 329 #endif
 330
 331   -- hsc dynamic flags
 332   flags                 :: [DynFlag]
 333  }
 334
 335 data HscLang
 336   = HscC
 337   | HscAsm
 338   | HscJava
 339   | HscILX
 340   | HscInterpreted
 341   | HscNothing
 342     deriving (Eq, Show)
 343
 344 defaultHscLang
 345   | cGhcWithNativeCodeGen == "YES" &&
 346         (prefixMatch "i386" cTARGETPLATFORM ||
 347          prefixMatch "sparc" cTARGETPLATFORM)   =  HscAsm
 348   | otherwise                                   =  HscC
 349
 350 defaultDynFlags = DynFlags {
 351   coreToDo = [], stgToDo = [],
 352   hscLang = defaultHscLang,
 353   hscOutName = "",
 354   hscStubHOutName = "", hscStubCOutName = "",
 355   extCoreName = "",
 356   verbosity = 0,
 357   cppFlag               = False,
 358   ppFlag                = False,
 359   stolen_x86_regs       = 4,
 360   cmdlineHcIncludes     = [],
 361   opt_L                 = [],
 362   opt_P                 = [],
 363   opt_F                 = [],
 364   opt_c                 = [],
 365   opt_a                 = [],
 366   opt_m                 = [],
 367 #ifdef ILX
 368   opt_I                 = [],
 369   opt_i                 = [],
 370 #endif
 371   flags = [Opt_Generics] ++ standardWarnings,
 372         -- Generating the helper-functions for
 373         -- generics is now on by default
 374   }
 375
 376 {-
 377     Verbosity levels:
 378
 379     0   |   print errors & warnings only
 380     1   |   minimal verbosity: print "compiling M ... done." for each module.
 381     2   |   equivalent to -dshow-passes
 382     3   |   equivalent to existing "ghc -v"
 383     4   |   "ghc -v -ddump-most"
 384     5   |   "ghc -v -ddump-all"
 385 -}
 386
 387 dopt :: DynFlag -> DynFlags -> Bool
 388 dopt f dflags  = f `elem` (flags dflags)
 389
 390 dopt_CoreToDo :: DynFlags -> [CoreToDo]
 391 dopt_CoreToDo = coreToDo
 392
 393 dopt_StgToDo :: DynFlags -> [StgToDo]
 394 dopt_StgToDo = stgToDo
 395
 396 dopt_OutName :: DynFlags -> String
 397 dopt_OutName = hscOutName
 398
 399 dopt_HscLang :: DynFlags -> HscLang
 400 dopt_HscLang = hscLang
 401
 402 dopt_set :: DynFlags -> DynFlag -> DynFlags
 403 dopt_set dfs f = dfs{ flags = f : flags dfs }
 404
 405 dopt_unset :: DynFlags -> DynFlag -> DynFlags
 406 dopt_unset dfs f = dfs{ flags = filter (/= f) (flags dfs) }
 407
 408 getOpts :: (DynFlags -> [a]) -> IO [a]
 409         -- We add to the options from the front, so we need to reverse the list
 410 getOpts opts = dynFlag opts >>= return . reverse
 411
 412 -- we can only switch between HscC, HscAsmm, and HscILX with dynamic flags
 413 -- (-fvia-C, -fasm, -filx respectively).
 414 setLang l = updDynFlags (\ dfs -> case hscLang dfs of
 415                                         HscC   -> dfs{ hscLang = l }
 416                                         HscAsm -> dfs{ hscLang = l }
 417                                         HscILX -> dfs{ hscLang = l }
 418                                         _      -> dfs)
 419
 420 getVerbFlag = do
 421    verb <- dynFlag verbosity
 422    if verb >= 3  then return  "-v" else return ""
 423 \end{code}
 424
 425 -----------------------------------------------------------------------------
 426 -- Mess about with the mutable variables holding the dynamic arguments
 427
 428 -- v_InitDynFlags
 429 --      is the "baseline" dynamic flags, initialised from
 430 --      the defaults and command line options, and updated by the
 431 --      ':s' command in GHCi.
 432 --
 433 -- v_DynFlags
 434 --      is the dynamic flags for the current compilation.  It is reset
 435 --      to the value of v_InitDynFlags before each compilation, then
 436 --      updated by reading any OPTIONS pragma in the current module.
 437
 438 \begin{code}
 439 GLOBAL_VAR(v_InitDynFlags, defaultDynFlags, DynFlags)
 440 GLOBAL_VAR(v_DynFlags,     defaultDynFlags, DynFlags)
 441
 442 setDynFlags :: DynFlags -> IO ()
 443 setDynFlags dfs = writeIORef v_DynFlags dfs
 444
 445 saveDynFlags :: IO ()
 446 saveDynFlags = do dfs <- readIORef v_DynFlags
 447                   writeIORef v_InitDynFlags dfs
 448
 449 restoreDynFlags :: IO DynFlags
 450 restoreDynFlags = do dfs <- readIORef v_InitDynFlags
 451                      writeIORef v_DynFlags dfs
 452                      return dfs
 453
 454 getDynFlags :: IO DynFlags
 455 getDynFlags = readIORef v_DynFlags
 456
 457 updDynFlags :: (DynFlags -> DynFlags) -> IO ()
 458 updDynFlags f = do dfs <- readIORef v_DynFlags
 459                    writeIORef v_DynFlags (f dfs)
 460
 461 dynFlag :: (DynFlags -> a) -> IO a
 462 dynFlag f = do dflags <- readIORef v_DynFlags; return (f dflags)
 463
 464 setDynFlag, unSetDynFlag :: DynFlag -> IO ()
 465 setDynFlag f   = updDynFlags (\dfs -> dopt_set dfs f)
 466 unSetDynFlag f = updDynFlags (\dfs -> dopt_unset dfs f)
 467 \end{code}
 468
 469
 470 %************************************************************************
 471 %*                                                                      *
 472 \subsection{Warnings}
 473 %*                                                                      *
 474 %************************************************************************
 475
 476 \begin{code}
 477 standardWarnings
 478     = [ Opt_WarnDeprecations,
 479         Opt_WarnOverlappingPatterns,
 480         Opt_WarnMissingFields,
 481         Opt_WarnMissingMethods,
 482         Opt_WarnDuplicateExports
 483       ]
 484
 485 minusWOpts
 486     = standardWarnings ++
 487       [ Opt_WarnUnusedBinds,
 488         Opt_WarnUnusedMatches,
 489         Opt_WarnUnusedImports,
 490         Opt_WarnIncompletePatterns,
 491         Opt_WarnMisc
 492       ]
 493
 494 minusWallOpts
 495     = minusWOpts ++
 496       [ Opt_WarnTypeDefaults,
 497         Opt_WarnNameShadowing,
 498         Opt_WarnMissingSigs,
 499         Opt_WarnHiShadows
 500       ]
 501 \end{code}
 502
 503 %************************************************************************
 504 %*                                                                      *
 505 \subsection{Classifying command-line options}
 506 %*                                                                      *
 507 %************************************************************************
 508
 509 \begin{code}
 510 -- v_Statis_hsc_opts is here to avoid a circular dependency with
 511 -- main/DriverState.
 512 GLOBAL_VAR(v_Static_hsc_opts, [], [String])
 513
 514 lookUp           :: FastString -> Bool
 515 lookup_int       :: String -> Maybe Int
 516 lookup_def_int   :: String -> Int -> Int
 517 lookup_def_float :: String -> Float -> Float
 518 lookup_str       :: String -> Maybe String
 519
 520 unpacked_static_opts = unsafePerformIO (readIORef v_Static_hsc_opts)
 521 packed_static_opts   = map mkFastString unpacked_static_opts
 522
 523 lookUp     sw = sw `elem` packed_static_opts
 524
 525 lookup_str sw = firstJust (map (startsWith sw) unpacked_static_opts)
 526
 527 lookup_int sw = case (lookup_str sw) of
 528                   Nothing -> Nothing
 529                   Just xx -> Just (read xx)
 530
 531 lookup_def_int sw def = case (lookup_str sw) of
 532                             Nothing -> def              -- Use default
 533                             Just xx -> read xx
 534
 535 lookup_def_float sw def = case (lookup_str sw) of
 536                             Nothing -> def              -- Use default
 537                             Just xx -> read xx
 538
 539
 540 {-
 541  Putting the compiler options into temporary at-files
 542  may turn out to be necessary later on if we turn hsc into
 543  a pure Win32 application where I think there's a command-line
 544  length limit of 255. unpacked_opts understands the @ option.
 545
 546 unpacked_opts :: [String]
 547 unpacked_opts =
 548   concat $
 549   map (expandAts) $
 550   map unpackFS argv  -- NOT ARGV any more: v_Static_hsc_opts
 551   where
 552    expandAts ('@':fname) = words (unsafePerformIO (readFile fname))
 553    expandAts l = [l]
 554 -}
 555 \end{code}
 556
 557 %************************************************************************
 558 %*                                                                      *
 559 \subsection{Static options}
 560 %*                                                                      *
 561 %************************************************************************
 562
 563 \begin{code}
 564 -- debugging opts
 565 opt_PprStyle_NoPrags            = lookUp  FSLIT("-dppr-noprags")
 566 opt_PprStyle_Debug              = lookUp  FSLIT("-dppr-debug")
 567 opt_PprStyle_RawTypes           = lookUp  FSLIT("-dppr-rawtypes")
 568 opt_PprUserLength               = lookup_def_int "-dppr-user-length" 5 --ToDo: give this a name
 569
 570 -- profiling opts
 571 opt_AutoSccsOnAllToplevs        = lookUp  FSLIT("-fauto-sccs-on-all-toplevs")
 572 opt_AutoSccsOnExportedToplevs   = lookUp  FSLIT("-fauto-sccs-on-exported-toplevs")
 573 opt_AutoSccsOnIndividualCafs    = lookUp  FSLIT("-fauto-sccs-on-individual-cafs")
 574 opt_AutoSccsOnDicts             = lookUp  FSLIT("-fauto-sccs-on-dicts")
 575 opt_SccProfilingOn              = lookUp  FSLIT("-fscc-profiling")
 576 opt_DoTickyProfiling            = lookUp  FSLIT("-fticky-ticky")
 577
 578 -- language opts
 579 opt_AllStrict                   = lookUp  FSLIT("-fall-strict")
 580 opt_DictsStrict                 = lookUp  FSLIT("-fdicts-strict")
 581 opt_IrrefutableTuples           = lookUp  FSLIT("-firrefutable-tuples")
 582 opt_MaxContextReductionDepth    = lookup_def_int "-fcontext-stack" mAX_CONTEXT_REDUCTION_DEPTH
 583 opt_NumbersStrict               = lookUp  FSLIT("-fnumbers-strict")
 584 opt_Parallel                    = lookUp  FSLIT("-fparallel")
 585 opt_SMP                         = lookUp  FSLIT("-fsmp")
 586 opt_Flatten                     = lookUp  FSLIT("-fflatten")
 587
 588 -- optimisation opts
 589 opt_NoMethodSharing             = lookUp  FSLIT("-fno-method-sharing")
 590 opt_DoSemiTagging               = lookUp  FSLIT("-fsemi-tagging")
 591 opt_FoldrBuildOn                = lookUp  FSLIT("-ffoldr-build-on")
 592 opt_CprOff                      = lookUp  FSLIT("-fcpr-off")
 593         -- Switch off CPR analysis in the new demand analyser
 594 opt_LiberateCaseThreshold       = lookup_def_int "-fliberate-case-threshold" (10::Int)
 595 opt_StgDoLetNoEscapes           = lookUp  FSLIT("-flet-no-escape")
 596 opt_UnfoldCasms                 = lookUp  FSLIT("-funfold-casms-in-hi-file")
 597 opt_UsageSPOn                   = lookUp  FSLIT("-fusagesp-on")
 598 opt_UnboxStrictFields           = lookUp  FSLIT("-funbox-strict-fields")
 599 opt_MaxWorkerArgs               = lookup_def_int "-fmax-worker-args" (10::Int)
 600
 601 {-
 602    The optional '-inpackage=P' flag tells what package
 603    we are compiling this module for.
 604    The Prelude, for example is compiled with '-inpackage std'
 605 -}
 606 opt_InPackage                   = case lookup_str "-inpackage=" of
 607                                     Just p  -> mkFastString p
 608                                     Nothing -> FSLIT("Main")    -- The package name if none is specified
 609
 610 opt_EmitCExternDecls            = lookUp  FSLIT("-femit-extern-decls")
 611 opt_EnsureSplittableC           = lookUp  FSLIT("-fglobalise-toplev-names")
 612 opt_GranMacros                  = lookUp  FSLIT("-fgransim")
 613 opt_HiVersion                   = read (cProjectVersionInt ++ cProjectPatchLevel) :: Int
 614 opt_HistorySize                 = lookup_def_int "-fhistory-size" 20
 615 opt_IgnoreAsserts               = lookUp  FSLIT("-fignore-asserts")
 616 opt_IgnoreIfacePragmas          = lookUp  FSLIT("-fignore-interface-pragmas")
 617 opt_NoHiCheck                   = lookUp  FSLIT("-fno-hi-version-check")
 618 opt_OmitBlackHoling             = lookUp  FSLIT("-dno-black-holing")
 619 opt_OmitInterfacePragmas        = lookUp  FSLIT("-fomit-interface-pragmas")
 620 opt_RuntimeTypes                = lookUp  FSLIT("-fruntime-types")
 621
 622 -- Simplifier switches
 623 opt_SimplNoPreInlining          = lookUp  FSLIT("-fno-pre-inlining")
 624         -- NoPreInlining is there just to see how bad things
 625         -- get if you don't do it!
 626 opt_SimplDoEtaReduction         = lookUp  FSLIT("-fdo-eta-reduction")
 627 opt_SimplDoLambdaEtaExpansion   = lookUp  FSLIT("-fdo-lambda-eta-expansion")
 628 opt_SimplCaseMerge              = lookUp  FSLIT("-fcase-merge")
 629 opt_SimplExcessPrecision        = lookUp  FSLIT("-fexcess-precision")
 630
 631 -- Unfolding control
 632 opt_UF_CreationThreshold        = lookup_def_int "-funfolding-creation-threshold"  (45::Int)
 633 opt_UF_UseThreshold             = lookup_def_int "-funfolding-use-threshold"       (8::Int)     -- Discounts can be big
 634 opt_UF_FunAppDiscount           = lookup_def_int "-funfolding-fun-discount"        (6::Int)     -- It's great to inline a fn
 635 opt_UF_KeenessFactor            = lookup_def_float "-funfolding-keeness-factor"    (1.5::Float)
 636 opt_UF_UpdateInPlace            = lookUp  FSLIT("-funfolding-update-in-place")
 637
 638 opt_UF_CheapOp  = ( 1 :: Int)   -- Only one instruction; and the args are charged for
 639 opt_UF_DearOp   = ( 4 :: Int)
 640
 641 opt_NoPruneDecls                = lookUp  FSLIT("-fno-prune-decls")
 642 opt_NoPruneTyDecls              = lookUp  FSLIT("-fno-prune-tydecls")
 643 opt_Static                      = lookUp  FSLIT("-static")
 644 opt_Unregisterised              = lookUp  FSLIT("-funregisterised")
 645 opt_EmitExternalCore            = lookUp  FSLIT("-fext-core")
 646 \end{code}
 647
 648 %************************************************************************
 649 %*                                                                      *
 650 \subsection{List of static hsc flags}
 651 %*                                                                      *
 652 %************************************************************************
 653
 654 \begin{code}
 655 isStaticHscFlag f =
 656   f `elem` [
 657         "fauto-sccs-on-all-toplevs",
 658         "fauto-sccs-on-exported-toplevs",
 659         "fauto-sccs-on-individual-cafs",
 660         "fauto-sccs-on-dicts",
 661         "fscc-profiling",
 662         "fticky-ticky",
 663         "fall-strict",
 664         "fdicts-strict",
 665         "firrefutable-tuples",
 666         "fnumbers-strict",
 667         "fparallel",
 668         "fsmp",
 669         "fflatten",
 670         "fsemi-tagging",
 671         "ffoldr-build-on",
 672         "flet-no-escape",
 673         "funfold-casms-in-hi-file",
 674         "fusagesp-on",
 675         "funbox-strict-fields",
 676         "femit-extern-decls",
 677         "fglobalise-toplev-names",
 678         "fgransim",
 679         "fignore-asserts",
 680         "fignore-interface-pragmas",
 681         "fno-hi-version-check",
 682         "dno-black-holing",
 683         "fno-method-sharing",
 684         "fomit-interface-pragmas",
 685         "fruntime-types",
 686         "fno-pre-inlining",
 687         "fdo-eta-reduction",
 688         "fdo-lambda-eta-expansion",
 689         "fcase-merge",
 690         "fexcess-precision",
 691         "funfolding-update-in-place",
 692         "fno-prune-decls",
 693         "fno-prune-tydecls",
 694         "static",
 695         "funregisterised",
 696         "fext-core",
 697         "frule-check",
 698         "fcpr-off"
 699         ]
 700   || any (flip prefixMatch f) [
 701         "fcontext-stack",
 702         "fliberate-case-threshold",
 703         "fmax-worker-args",
 704         "fhistory-size",
 705         "funfolding-creation-threshold",
 706         "funfolding-use-threshold",
 707         "funfolding-fun-discount",
 708         "funfolding-keeness-factor"
 709      ]
 710 \end{code}
 711
 712 %************************************************************************
 713 %*                                                                      *
 714 \subsection{Misc functions for command-line options}
 715 %*                                                                      *
 716 %************************************************************************
 717
 718
 719
 720 \begin{code}
 721 startsWith :: String -> String -> Maybe String
 722 -- startsWith pfx (pfx++rest) = Just rest
 723
 724 startsWith []     str = Just str
 725 startsWith (c:cs) (s:ss)
 726   = if c /= s then Nothing else startsWith cs ss
 727 startsWith  _     []  = Nothing
 728
 729 endsWith  :: String -> String -> Maybe String
 730 endsWith cs ss
 731   = case (startsWith (reverse cs) (reverse ss)) of
 732       Nothing -> Nothing
 733       Just rs -> Just (reverse rs)
 734 \end{code}