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_LiberateCaseThreshold,
  77         opt_StgDoLetNoEscapes,
  78         opt_UnfoldCasms,
  79         opt_CprOff,
  80         opt_RulesOff,
  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_NoPruneDecls,
 111         opt_Static,
 112         opt_Unregisterised,
 113         opt_EmitExternalCore
 114     ) where
 115
 116 #include "HsVersions.h"
 117
 118 import Constants        -- Default values for some flags
 119 import Util
 120 import FastString       ( FastString, mkFastString )
 121 import Config
 122 import Maybes           ( firstJust )
 123
 124 import GLAEXTS
 125 import DATA_IOREF       ( IORef, readIORef, writeIORef )
 126 import UNSAFE_IO        ( unsafePerformIO )
 127 \end{code}
 128
 129 %************************************************************************
 130 %*                                                                      *
 131 \subsection{Command-line options}
 132 %*                                                                      *
 133 %************************************************************************
 134
 135 The hsc command-line options are split into two categories:
 136
 137   - static flags
 138   - dynamic flags
 139
 140 Static flags are represented by top-level values of type Bool or Int,
 141 for example.  They therefore have the same value throughout the
 142 invocation of hsc.
 143
 144 Dynamic flags are represented by an abstract type, DynFlags, which is
 145 passed into hsc by the compilation manager for every compilation.
 146 Dynamic flags are those that change on a per-compilation basis,
 147 perhaps because they may be present in the OPTIONS pragma at the top
 148 of a module.
 149
 150 Other flag-related blurb:
 151
 152 A list of {\em ToDo}s is things to be done in a particular part of
 153 processing.  A (fictitious) example for the Core-to-Core simplifier
 154 might be: run the simplifier, then run the strictness analyser, then
 155 run the simplifier again (three ``todos'').
 156
 157 There are three ``to-do processing centers'' at the moment.  In the
 158 main loop (\tr{main/Main.lhs}), in the Core-to-Core processing loop
 159 (\tr{simplCore/SimplCore.lhs), and in the STG-to-STG processing loop
 160 (\tr{simplStg/SimplStg.lhs}).
 161
 162 %************************************************************************
 163 %*                                                                      *
 164 \subsection{Datatypes associated with command-line options}
 165 %*                                                                      *
 166 %************************************************************************
 167
 168 \begin{code}
 169 data CoreToDo           -- These are diff core-to-core passes,
 170                         -- which may be invoked in any order,
 171                         -- as many times as you like.
 172
 173   = CoreDoSimplify      -- The core-to-core simplifier.
 174         SimplifierMode
 175         [SimplifierSwitch]
 176                         -- Each run of the simplifier can take a different
 177                         -- set of simplifier-specific flags.
 178   | CoreDoFloatInwards
 179   | CoreDoFloatOutwards FloatOutSwitches
 180   | CoreLiberateCase
 181   | CoreDoPrintCore
 182   | CoreDoStaticArgs
 183   | CoreDoStrictness
 184   | CoreDoWorkerWrapper
 185   | CoreDoSpecialising
 186   | CoreDoSpecConstr
 187   | CoreDoOldStrictness
 188   | CoreDoGlomBinds
 189   | CoreCSE
 190   | CoreDoRuleCheck Int{-CompilerPhase-} String -- Check for non-application of rules
 191                                                 -- matching this string
 192
 193   | CoreDoNothing        -- useful when building up lists of these things
 194 \end{code}
 195
 196 \begin{code}
 197 data StgToDo
 198   = StgDoMassageForProfiling  -- should be (next to) last
 199   -- There's also setStgVarInfo, but its absolute "lastness"
 200   -- is so critical that it is hardwired in (no flag).
 201   | D_stg_stats
 202 \end{code}
 203
 204 \begin{code}
 205 data SimplifierMode             -- See comments in SimplMonad
 206   = SimplGently
 207   | SimplPhase Int
 208
 209 data SimplifierSwitch
 210   = MaxSimplifierIterations Int
 211   | NoCaseOfCase
 212
 213 data FloatOutSwitches
 214   = FloatOutSw  Bool    -- True <=> float lambdas to top level
 215                 Bool    -- True <=> float constants to top level,
 216                         --          even if they do not escape a lambda
 217 \end{code}
 218
 219 %************************************************************************
 220 %*                                                                      *
 221 \subsection{Dynamic command-line options}
 222 %*                                                                      *
 223 %************************************************************************
 224
 225 \begin{code}
 226 data DynFlag
 227
 228    -- debugging flags
 229    = Opt_D_dump_absC
 230    | Opt_D_dump_asm
 231    | Opt_D_dump_cpranal
 232    | Opt_D_dump_deriv
 233    | Opt_D_dump_ds
 234    | Opt_D_dump_flatC
 235    | Opt_D_dump_foreign
 236    | Opt_D_dump_inlinings
 237    | Opt_D_dump_occur_anal
 238    | Opt_D_dump_parsed
 239    | Opt_D_dump_realC
 240    | Opt_D_dump_rn
 241    | Opt_D_dump_simpl
 242    | Opt_D_dump_simpl_iterations
 243    | Opt_D_dump_spec
 244    | Opt_D_dump_prep
 245    | Opt_D_dump_stg
 246    | Opt_D_dump_stranal
 247    | Opt_D_dump_tc
 248    | Opt_D_dump_types
 249    | Opt_D_dump_rules
 250    | Opt_D_dump_cse
 251    | Opt_D_dump_worker_wrapper
 252    | Opt_D_dump_rn_trace
 253    | Opt_D_dump_rn_stats
 254    | Opt_D_dump_stix
 255    | Opt_D_dump_simpl_stats
 256    | Opt_D_dump_tc_trace
 257    | Opt_D_dump_splices
 258    | Opt_D_dump_BCOs
 259    | Opt_D_dump_vect
 260    | Opt_D_source_stats
 261    | Opt_D_verbose_core2core
 262    | Opt_D_verbose_stg2stg
 263    | Opt_D_dump_hi
 264    | Opt_D_dump_hi_diffs
 265    | Opt_D_dump_minimal_imports
 266    | Opt_DoCoreLinting
 267    | Opt_DoStgLinting
 268
 269    | Opt_WarnIsError            -- -Werror; makes warnings fatal
 270    | Opt_WarnDuplicateExports
 271    | Opt_WarnHiShadows
 272    | Opt_WarnIncompletePatterns
 273    | Opt_WarnMissingFields
 274    | Opt_WarnMissingMethods
 275    | Opt_WarnMissingSigs
 276    | Opt_WarnNameShadowing
 277    | Opt_WarnOverlappingPatterns
 278    | Opt_WarnSimplePatterns
 279    | Opt_WarnTypeDefaults
 280    | Opt_WarnUnusedBinds
 281    | Opt_WarnUnusedImports
 282    | Opt_WarnUnusedMatches
 283    | Opt_WarnDeprecations
 284    | Opt_WarnMisc
 285
 286    -- language opts
 287    | Opt_AllowOverlappingInstances
 288    | Opt_AllowUndecidableInstances
 289    | Opt_AllowIncoherentInstances
 290    | Opt_NoMonomorphismRestriction
 291    | Opt_GlasgowExts
 292    | Opt_FFI
 293    | Opt_PArr                          -- syntactic support for parallel arrays
 294    | Opt_With                          -- deprecated keyword for implicit parms
 295    | Opt_Arrows                        -- Arrow-notation syntax
 296    | Opt_Generics
 297    | Opt_NoImplicitPrelude
 298
 299    deriving (Eq)
 300
 301 data DynFlags = DynFlags {
 302   coreToDo              :: [CoreToDo],
 303   stgToDo               :: [StgToDo],
 304   hscLang               :: HscLang,
 305   hscOutName            :: String,      -- name of the output file
 306   hscStubHOutName       :: String,      -- name of the .stub_h output file
 307   hscStubCOutName       :: String,      -- name of the .stub_c output file
 308   extCoreName           :: String,      -- name of the .core output file
 309   verbosity             :: Int,         -- verbosity level
 310   cppFlag               :: Bool,        -- preprocess with cpp?
 311   ppFlag                :: Bool,        -- preprocess with a Haskell Pp?
 312   stolen_x86_regs       :: Int,
 313   cmdlineHcIncludes     :: [String],    -- -#includes
 314
 315   -- options for particular phases
 316   opt_L                 :: [String],
 317   opt_P                 :: [String],
 318   opt_F                 :: [String],
 319   opt_c                 :: [String],
 320   opt_a                 :: [String],
 321   opt_m                 :: [String],
 322 #ifdef ILX
 323   opt_I                 :: [String],
 324   opt_i                 :: [String],
 325 #endif
 326
 327   -- hsc dynamic flags
 328   flags                 :: [DynFlag]
 329  }
 330
 331 data HscLang
 332   = HscC
 333   | HscAsm
 334   | HscJava
 335   | HscILX
 336   | HscInterpreted
 337   | HscNothing
 338     deriving (Eq, Show)
 339
 340 defaultHscLang
 341   | cGhcWithNativeCodeGen == "YES" &&
 342         (prefixMatch "i386" cTARGETPLATFORM ||
 343          prefixMatch "sparc" cTARGETPLATFORM ||
 344          prefixMatch "powerpc" cTARGETPLATFORM)   =  HscAsm
 345   | otherwise                                   =  HscC
 346
 347 defaultDynFlags = DynFlags {
 348   coreToDo = [], stgToDo = [],
 349   hscLang = defaultHscLang,
 350   hscOutName = "",
 351   hscStubHOutName = "", hscStubCOutName = "",
 352   extCoreName = "",
 353   verbosity = 0,
 354   cppFlag               = False,
 355   ppFlag                = False,
 356   stolen_x86_regs       = 4,
 357   cmdlineHcIncludes     = [],
 358   opt_L                 = [],
 359   opt_P                 = [],
 360   opt_F                 = [],
 361   opt_c                 = [],
 362   opt_a                 = [],
 363   opt_m                 = [],
 364 #ifdef ILX
 365   opt_I                 = [],
 366   opt_i                 = [],
 367 #endif
 368   flags = [Opt_Generics] ++ standardWarnings,
 369         -- Generating the helper-functions for
 370         -- generics is now on by default
 371   }
 372
 373 {-
 374     Verbosity levels:
 375
 376     0   |   print errors & warnings only
 377     1   |   minimal verbosity: print "compiling M ... done." for each module.
 378     2   |   equivalent to -dshow-passes
 379     3   |   equivalent to existing "ghc -v"
 380     4   |   "ghc -v -ddump-most"
 381     5   |   "ghc -v -ddump-all"
 382 -}
 383
 384 dopt :: DynFlag -> DynFlags -> Bool
 385 dopt f dflags  = f `elem` (flags dflags)
 386
 387 dopt_CoreToDo :: DynFlags -> [CoreToDo]
 388 dopt_CoreToDo = coreToDo
 389
 390 dopt_StgToDo :: DynFlags -> [StgToDo]
 391 dopt_StgToDo = stgToDo
 392
 393 dopt_OutName :: DynFlags -> String
 394 dopt_OutName = hscOutName
 395
 396 dopt_HscLang :: DynFlags -> HscLang
 397 dopt_HscLang = hscLang
 398
 399 dopt_set :: DynFlags -> DynFlag -> DynFlags
 400 dopt_set dfs f = dfs{ flags = f : flags dfs }
 401
 402 dopt_unset :: DynFlags -> DynFlag -> DynFlags
 403 dopt_unset dfs f = dfs{ flags = filter (/= f) (flags dfs) }
 404
 405 getOpts :: (DynFlags -> [a]) -> IO [a]
 406         -- We add to the options from the front, so we need to reverse the list
 407 getOpts opts = dynFlag opts >>= return . reverse
 408
 409 -- we can only switch between HscC, HscAsmm, and HscILX with dynamic flags
 410 -- (-fvia-C, -fasm, -filx respectively).
 411 setLang l = updDynFlags (\ dfs -> case hscLang dfs of
 412                                         HscC   -> dfs{ hscLang = l }
 413                                         HscAsm -> dfs{ hscLang = l }
 414                                         HscILX -> dfs{ hscLang = l }
 415                                         _      -> dfs)
 416
 417 getVerbFlag = do
 418    verb <- dynFlag verbosity
 419    if verb >= 3  then return  "-v" else return ""
 420 \end{code}
 421
 422 -----------------------------------------------------------------------------
 423 -- Mess about with the mutable variables holding the dynamic arguments
 424
 425 -- v_InitDynFlags
 426 --      is the "baseline" dynamic flags, initialised from
 427 --      the defaults and command line options, and updated by the
 428 --      ':s' command in GHCi.
 429 --
 430 -- v_DynFlags
 431 --      is the dynamic flags for the current compilation.  It is reset
 432 --      to the value of v_InitDynFlags before each compilation, then
 433 --      updated by reading any OPTIONS pragma in the current module.
 434
 435 \begin{code}
 436 GLOBAL_VAR(v_InitDynFlags, defaultDynFlags, DynFlags)
 437 GLOBAL_VAR(v_DynFlags,     defaultDynFlags, DynFlags)
 438
 439 setDynFlags :: DynFlags -> IO ()
 440 setDynFlags dfs = writeIORef v_DynFlags dfs
 441
 442 saveDynFlags :: IO ()
 443 saveDynFlags = do dfs <- readIORef v_DynFlags
 444                   writeIORef v_InitDynFlags dfs
 445
 446 restoreDynFlags :: IO DynFlags
 447 restoreDynFlags = do dfs <- readIORef v_InitDynFlags
 448                      writeIORef v_DynFlags dfs
 449                      return dfs
 450
 451 getDynFlags :: IO DynFlags
 452 getDynFlags = readIORef v_DynFlags
 453
 454 updDynFlags :: (DynFlags -> DynFlags) -> IO ()
 455 updDynFlags f = do dfs <- readIORef v_DynFlags
 456                    writeIORef v_DynFlags (f dfs)
 457
 458 dynFlag :: (DynFlags -> a) -> IO a
 459 dynFlag f = do dflags <- readIORef v_DynFlags; return (f dflags)
 460
 461 setDynFlag, unSetDynFlag :: DynFlag -> IO ()
 462 setDynFlag f   = updDynFlags (\dfs -> dopt_set dfs f)
 463 unSetDynFlag f = updDynFlags (\dfs -> dopt_unset dfs f)
 464 \end{code}
 465
 466
 467 %************************************************************************
 468 %*                                                                      *
 469 \subsection{Warnings}
 470 %*                                                                      *
 471 %************************************************************************
 472
 473 \begin{code}
 474 standardWarnings
 475     = [ Opt_WarnDeprecations,
 476         Opt_WarnOverlappingPatterns,
 477         Opt_WarnMissingFields,
 478         Opt_WarnMissingMethods,
 479         Opt_WarnDuplicateExports
 480       ]
 481
 482 minusWOpts
 483     = standardWarnings ++
 484       [ Opt_WarnUnusedBinds,
 485         Opt_WarnUnusedMatches,
 486         Opt_WarnUnusedImports,
 487         Opt_WarnIncompletePatterns,
 488         Opt_WarnMisc
 489       ]
 490
 491 minusWallOpts
 492     = minusWOpts ++
 493       [ Opt_WarnTypeDefaults,
 494         Opt_WarnNameShadowing,
 495         Opt_WarnMissingSigs,
 496         Opt_WarnHiShadows
 497       ]
 498 \end{code}
 499
 500 %************************************************************************
 501 %*                                                                      *
 502 \subsection{Classifying command-line options}
 503 %*                                                                      *
 504 %************************************************************************
 505
 506 \begin{code}
 507 -- v_Statis_hsc_opts is here to avoid a circular dependency with
 508 -- main/DriverState.
 509 GLOBAL_VAR(v_Static_hsc_opts, [], [String])
 510
 511 lookUp           :: FastString -> Bool
 512 lookup_int       :: String -> Maybe Int
 513 lookup_def_int   :: String -> Int -> Int
 514 lookup_def_float :: String -> Float -> Float
 515 lookup_str       :: String -> Maybe String
 516
 517 unpacked_static_opts = unsafePerformIO (readIORef v_Static_hsc_opts)
 518 packed_static_opts   = map mkFastString unpacked_static_opts
 519
 520 lookUp     sw = sw `elem` packed_static_opts
 521
 522 lookup_str sw = firstJust (map (startsWith sw) unpacked_static_opts)
 523
 524 lookup_int sw = case (lookup_str sw) of
 525                   Nothing -> Nothing
 526                   Just xx -> Just (read xx)
 527
 528 lookup_def_int sw def = case (lookup_str sw) of
 529                             Nothing -> def              -- Use default
 530                             Just xx -> read xx
 531
 532 lookup_def_float sw def = case (lookup_str sw) of
 533                             Nothing -> def              -- Use default
 534                             Just xx -> read xx
 535
 536
 537 {-
 538  Putting the compiler options into temporary at-files
 539  may turn out to be necessary later on if we turn hsc into
 540  a pure Win32 application where I think there's a command-line
 541  length limit of 255. unpacked_opts understands the @ option.
 542
 543 unpacked_opts :: [String]
 544 unpacked_opts =
 545   concat $
 546   map (expandAts) $
 547   map unpackFS argv  -- NOT ARGV any more: v_Static_hsc_opts
 548   where
 549    expandAts ('@':fname) = words (unsafePerformIO (readFile fname))
 550    expandAts l = [l]
 551 -}
 552 \end{code}
 553
 554 %************************************************************************
 555 %*                                                                      *
 556 \subsection{Static options}
 557 %*                                                                      *
 558 %************************************************************************
 559
 560 \begin{code}
 561 -- debugging opts
 562 opt_PprStyle_NoPrags            = lookUp  FSLIT("-dppr-noprags")
 563 opt_PprStyle_Debug              = lookUp  FSLIT("-dppr-debug")
 564 opt_PprStyle_RawTypes           = lookUp  FSLIT("-dppr-rawtypes")
 565 opt_PprUserLength               = lookup_def_int "-dppr-user-length" 5 --ToDo: give this a name
 566
 567 -- profiling opts
 568 opt_AutoSccsOnAllToplevs        = lookUp  FSLIT("-fauto-sccs-on-all-toplevs")
 569 opt_AutoSccsOnExportedToplevs   = lookUp  FSLIT("-fauto-sccs-on-exported-toplevs")
 570 opt_AutoSccsOnIndividualCafs    = lookUp  FSLIT("-fauto-sccs-on-individual-cafs")
 571 opt_AutoSccsOnDicts             = lookUp  FSLIT("-fauto-sccs-on-dicts")
 572 opt_SccProfilingOn              = lookUp  FSLIT("-fscc-profiling")
 573 opt_DoTickyProfiling            = lookUp  FSLIT("-fticky-ticky")
 574
 575 -- language opts
 576 opt_AllStrict                   = lookUp  FSLIT("-fall-strict")
 577 opt_DictsStrict                 = lookUp  FSLIT("-fdicts-strict")
 578 opt_IrrefutableTuples           = lookUp  FSLIT("-firrefutable-tuples")
 579 opt_MaxContextReductionDepth    = lookup_def_int "-fcontext-stack" mAX_CONTEXT_REDUCTION_DEPTH
 580 opt_NumbersStrict               = lookUp  FSLIT("-fnumbers-strict")
 581 opt_Parallel                    = lookUp  FSLIT("-fparallel")
 582 opt_SMP                         = lookUp  FSLIT("-fsmp")
 583 opt_Flatten                     = lookUp  FSLIT("-fflatten")
 584
 585 -- optimisation opts
 586 opt_NoMethodSharing             = lookUp  FSLIT("-fno-method-sharing")
 587 opt_DoSemiTagging               = lookUp  FSLIT("-fsemi-tagging")
 588 opt_CprOff                      = lookUp  FSLIT("-fcpr-off")
 589 opt_RulesOff                    = lookUp  FSLIT("-frules-off")
 590         -- Switch off CPR analysis in the new demand analyser
 591 opt_LiberateCaseThreshold       = lookup_def_int "-fliberate-case-threshold" (10::Int)
 592 opt_StgDoLetNoEscapes           = lookUp  FSLIT("-flet-no-escape")
 593 opt_UnfoldCasms                 = lookUp  FSLIT("-funfold-casms-in-hi-file")
 594 opt_UnboxStrictFields           = lookUp  FSLIT("-funbox-strict-fields")
 595 opt_MaxWorkerArgs               = lookup_def_int "-fmax-worker-args" (10::Int)
 596
 597 {-
 598    The optional '-inpackage=P' flag tells what package
 599    we are compiling this module for.
 600    The Prelude, for example is compiled with '-inpackage std'
 601 -}
 602 opt_InPackage                   = case lookup_str "-inpackage=" of
 603                                     Just p  -> mkFastString p
 604                                     Nothing -> FSLIT("Main")    -- The package name if none is specified
 605
 606 opt_EmitCExternDecls            = lookUp  FSLIT("-femit-extern-decls")
 607 opt_EnsureSplittableC           = lookUp  FSLIT("-fglobalise-toplev-names")
 608 opt_GranMacros                  = lookUp  FSLIT("-fgransim")
 609 opt_HiVersion                   = read (cProjectVersionInt ++ cProjectPatchLevel) :: Int
 610 opt_HistorySize                 = lookup_def_int "-fhistory-size" 20
 611 opt_IgnoreAsserts               = lookUp  FSLIT("-fignore-asserts")
 612 opt_IgnoreIfacePragmas          = lookUp  FSLIT("-fignore-interface-pragmas")
 613 opt_NoHiCheck                   = lookUp  FSLIT("-fno-hi-version-check")
 614 opt_OmitBlackHoling             = lookUp  FSLIT("-dno-black-holing")
 615 opt_OmitInterfacePragmas        = lookUp  FSLIT("-fomit-interface-pragmas")
 616 opt_RuntimeTypes                = lookUp  FSLIT("-fruntime-types")
 617
 618 -- Simplifier switches
 619 opt_SimplNoPreInlining          = lookUp  FSLIT("-fno-pre-inlining")
 620         -- NoPreInlining is there just to see how bad things
 621         -- get if you don't do it!
 622 opt_SimplDoEtaReduction         = lookUp  FSLIT("-fdo-eta-reduction")
 623 opt_SimplDoLambdaEtaExpansion   = lookUp  FSLIT("-fdo-lambda-eta-expansion")
 624 opt_SimplCaseMerge              = lookUp  FSLIT("-fcase-merge")
 625 opt_SimplExcessPrecision        = lookUp  FSLIT("-fexcess-precision")
 626
 627 -- Unfolding control
 628 opt_UF_CreationThreshold        = lookup_def_int "-funfolding-creation-threshold"  (45::Int)
 629 opt_UF_UseThreshold             = lookup_def_int "-funfolding-use-threshold"       (8::Int)     -- Discounts can be big
 630 opt_UF_FunAppDiscount           = lookup_def_int "-funfolding-fun-discount"        (6::Int)     -- It's great to inline a fn
 631 opt_UF_KeenessFactor            = lookup_def_float "-funfolding-keeness-factor"    (1.5::Float)
 632 opt_UF_UpdateInPlace            = lookUp  FSLIT("-funfolding-update-in-place")
 633
 634 opt_UF_CheapOp  = ( 1 :: Int)   -- Only one instruction; and the args are charged for
 635 opt_UF_DearOp   = ( 4 :: Int)
 636
 637 opt_NoPruneDecls                = lookUp  FSLIT("-fno-prune-decls")
 638 opt_Static                      = lookUp  FSLIT("-static")
 639 opt_Unregisterised              = lookUp  FSLIT("-funregisterised")
 640 opt_EmitExternalCore            = lookUp  FSLIT("-fext-core")
 641 \end{code}
 642
 643 %************************************************************************
 644 %*                                                                      *
 645 \subsection{List of static hsc flags}
 646 %*                                                                      *
 647 %************************************************************************
 648
 649 \begin{code}
 650 isStaticHscFlag f =
 651   f `elem` [
 652         "fauto-sccs-on-all-toplevs",
 653         "fauto-sccs-on-exported-toplevs",
 654         "fauto-sccs-on-individual-cafs",
 655         "fauto-sccs-on-dicts",
 656         "fscc-profiling",
 657         "fticky-ticky",
 658         "fall-strict",
 659         "fdicts-strict",
 660         "firrefutable-tuples",
 661         "fnumbers-strict",
 662         "fparallel",
 663         "fsmp",
 664         "fflatten",
 665         "fsemi-tagging",
 666         "flet-no-escape",
 667         "funfold-casms-in-hi-file",
 668         "funbox-strict-fields",
 669         "femit-extern-decls",
 670         "fglobalise-toplev-names",
 671         "fgransim",
 672         "fignore-asserts",
 673         "fignore-interface-pragmas",
 674         "fno-hi-version-check",
 675         "dno-black-holing",
 676         "fno-method-sharing",
 677         "fomit-interface-pragmas",
 678         "fruntime-types",
 679         "fno-pre-inlining",
 680         "fdo-eta-reduction",
 681         "fdo-lambda-eta-expansion",
 682         "fcase-merge",
 683         "fexcess-precision",
 684         "funfolding-update-in-place",
 685         "fno-prune-decls",
 686         "static",
 687         "funregisterised",
 688         "fext-core",
 689         "frule-check",
 690         "frules-off",
 691         "fcpr-off"
 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}