DynFlags.hs 50.5 KB
Newer Older
1

2
{-# OPTIONS -fno-warn-missing-fields #-}
3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19
-----------------------------------------------------------------------------
--
-- Dynamic flags
--
-- Most flags are dynamic flags, which means they can change from
-- compilation to compilation using OPTIONS_GHC pragmas, and in a
-- multi-session GHC each session can be using different dynamic
-- flags.  Dynamic flags can also be set at the prompt in GHCi.
--
-- (c) The University of Glasgow 2005
--
-----------------------------------------------------------------------------

module DynFlags (
	-- Dynamic flags
	DynFlag(..),
	DynFlags(..),
20
	HscTarget(..), isObjectTarget, defaultObjectTarget,
21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41
	GhcMode(..), isOneShot,
	GhcLink(..), isNoLink,
	PackageFlag(..),
	Option(..),

	-- Configuration of the core-to-core and stg-to-stg phases
	CoreToDo(..),
	StgToDo(..),
	SimplifierSwitch(..), 
	SimplifierMode(..), FloatOutSwitches(..),
	getCoreToDo, getStgToDo,
	
	-- Manipulating DynFlags
	defaultDynFlags,		-- DynFlags
	initDynFlags,			-- DynFlags -> IO DynFlags

	dopt,				-- DynFlag -> DynFlags -> Bool
	dopt_set, dopt_unset,		-- DynFlags -> DynFlag -> DynFlags
	getOpts,			-- (DynFlags -> [a]) -> IO [a]
	getVerbFlag,
	updOptLevel,
42
	setTmpDir,
43
	setPackageName,
44 45 46
	
	-- parsing DynFlags
	parseDynamicFlags,
47
        allFlags,
48 49

	-- misc stuff
50
	machdepCCOpts, picCCOpts
51 52 53 54
  ) where

#include "HsVersions.h"

Simon Marlow's avatar
Simon Marlow committed
55 56
import Module		( Module, mkModuleName, mkModule )
import PackageConfig
57
import PrelNames	( mAIN )
Simon Marlow's avatar
Simon Marlow committed
58 59 60 61
#ifdef i386_TARGET_ARCH
import StaticFlags	( opt_Static )
#endif
import StaticFlags	( opt_PIC, WayName(..), v_Ways, v_Build_tag,
62
			  v_RTS_Build_tag )
63 64 65 66
import {-# SOURCE #-} Packages (PackageState)
import DriverPhases	( Phase(..), phaseInputExt )
import Config
import CmdLineParser
67
import Constants	( mAX_CONTEXT_REDUCTION_DEPTH )
68
import Panic		( panic, GhcException(..) )
69
import UniqFM           ( UniqFM )
70
import Util		( notNull, splitLongestPrefix, normalisePath )
71
import Maybes		( orElse, fromJust )
72
import SrcLoc           ( SrcSpan )
Simon Marlow's avatar
Simon Marlow committed
73 74
import Outputable
import {-# SOURCE #-} ErrUtils ( Severity(..), Message, mkLocMessage )
75

Simon Marlow's avatar
Simon Marlow committed
76 77 78
import Data.IORef	( readIORef )
import Control.Exception ( throwDyn )
import Control.Monad	( when )
79
#ifdef mingw32_TARGET_OS
80
import Data.List	( isPrefixOf )
simonpj@microsoft.com's avatar
simonpj@microsoft.com committed
81 82
#else
import Util		( split )
83
#endif
simonpj@microsoft.com's avatar
simonpj@microsoft.com committed
84

85
import Data.Char	( isUpper, toLower )
86 87
import System.IO        ( hPutStrLn, stderr )

88 89 90 91 92 93 94 95 96 97 98 99 100 101
-- -----------------------------------------------------------------------------
-- DynFlags

data DynFlag

   -- debugging flags
   = Opt_D_dump_cmm
   | Opt_D_dump_asm
   | Opt_D_dump_cpranal
   | Opt_D_dump_deriv
   | Opt_D_dump_ds
   | Opt_D_dump_flatC
   | Opt_D_dump_foreign
   | Opt_D_dump_inlinings
102
   | Opt_D_dump_rule_firings
103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125
   | Opt_D_dump_occur_anal
   | Opt_D_dump_parsed
   | Opt_D_dump_rn
   | Opt_D_dump_simpl
   | Opt_D_dump_simpl_iterations
   | Opt_D_dump_spec
   | Opt_D_dump_prep
   | Opt_D_dump_stg
   | Opt_D_dump_stranal
   | Opt_D_dump_tc
   | Opt_D_dump_types
   | Opt_D_dump_rules
   | Opt_D_dump_cse
   | Opt_D_dump_worker_wrapper
   | Opt_D_dump_rn_trace
   | Opt_D_dump_rn_stats
   | Opt_D_dump_opt_cmm
   | Opt_D_dump_simpl_stats
   | Opt_D_dump_tc_trace
   | Opt_D_dump_if_trace
   | Opt_D_dump_splices
   | Opt_D_dump_BCOs
   | Opt_D_dump_vect
andy@galois.com's avatar
andy@galois.com committed
126
   | Opt_D_dump_hpc
127 128 129 130 131 132
   | Opt_D_source_stats
   | Opt_D_verbose_core2core
   | Opt_D_verbose_stg2stg
   | Opt_D_dump_hi
   | Opt_D_dump_hi_diffs
   | Opt_D_dump_minimal_imports
133
   | Opt_D_dump_mod_cycles
134
   | Opt_D_faststring_stats
135 136 137 138 139 140 141
   | Opt_DoCoreLinting
   | Opt_DoStgLinting
   | Opt_DoCmmLinting

   | Opt_WarnIsError		-- -Werror; makes warnings fatal
   | Opt_WarnDuplicateExports
   | Opt_WarnHiShadows
142
   | Opt_WarnImplicitPrelude
143 144 145 146 147 148 149 150 151
   | Opt_WarnIncompletePatterns
   | Opt_WarnIncompletePatternsRecUpd
   | Opt_WarnMissingFields
   | Opt_WarnMissingMethods
   | Opt_WarnMissingSigs
   | Opt_WarnNameShadowing
   | Opt_WarnOverlappingPatterns
   | Opt_WarnSimplePatterns
   | Opt_WarnTypeDefaults
152
   | Opt_WarnMonomorphism
153 154 155 156 157 158
   | Opt_WarnUnusedBinds
   | Opt_WarnUnusedImports
   | Opt_WarnUnusedMatches
   | Opt_WarnDeprecations
   | Opt_WarnDodgyImports
   | Opt_WarnOrphans
159
   | Opt_WarnTabs
160 161 162 163 164 165

   -- language opts
   | Opt_AllowOverlappingInstances
   | Opt_AllowUndecidableInstances
   | Opt_AllowIncoherentInstances
   | Opt_MonomorphismRestriction
166
   | Opt_MonoPatBinds
167
   | Opt_ExtendedDefaultRules		-- Use GHC's extended rules for defaulting
168 169
   | Opt_GlasgowExts
   | Opt_FFI
170 171
   | Opt_PArr				-- Syntactic support for parallel arrays
   | Opt_Arrows				-- Arrow-notation syntax
172 173 174 175 176
   | Opt_TH
   | Opt_ImplicitParams
   | Opt_Generics
   | Opt_ImplicitPrelude 
   | Opt_ScopedTypeVariables
simonpj@microsoft.com's avatar
simonpj@microsoft.com committed
177
   | Opt_BangPatterns
178
   | Opt_TypeFamilies
179
   | Opt_OverloadedStrings
180 181
   | Opt_GADTs
   | Opt_RelaxedPolyRec			-- -X=RelaxedPolyRec
182 183 184 185 186

   -- optimisation opts
   | Opt_Strictness
   | Opt_FullLaziness
   | Opt_CSE
187 188
   | Opt_LiberateCase
   | Opt_SpecConstr
189 190 191 192
   | Opt_IgnoreInterfacePragmas
   | Opt_OmitInterfacePragmas
   | Opt_DoLambdaEtaExpansion
   | Opt_IgnoreAsserts
193
   | Opt_IgnoreBreakpoints
194 195 196
   | Opt_DoEtaReduction
   | Opt_CaseMerge
   | Opt_UnboxStrictFields
197
   | Opt_DictsCheap
198
   | Opt_RewriteRules
199 200

   -- misc opts
Ian Lynagh's avatar
Ian Lynagh committed
201
   | Opt_ShortGhciBanner
202 203
   | Opt_Cpp
   | Opt_Pp
204
   | Opt_ForceRecomp
205 206 207 208 209 210 211
   | Opt_DryRun
   | Opt_DoAsmMangling
   | Opt_ExcessPrecision
   | Opt_ReadUserPackageConf
   | Opt_NoHsMain
   | Opt_SplitObjs
   | Opt_StgStats
212
   | Opt_HideAllPackages
213
   | Opt_PrintBindResult
214
   | Opt_Haddock
215
   | Opt_Hpc_No_Auto
216
   | Opt_BreakOnException
217 218 219 220 221 222 223 224 225

   -- keeping stuff
   | Opt_KeepHiDiffs
   | Opt_KeepHcFiles
   | Opt_KeepSFiles
   | Opt_KeepRawSFiles
   | Opt_KeepTmpFiles

   deriving (Eq)
226
 
227 228 229 230 231 232 233 234 235 236 237 238
data DynFlags = DynFlags {
  ghcMode		:: GhcMode,
  ghcLink		:: GhcLink,
  coreToDo   		:: Maybe [CoreToDo], -- reserved for -Ofile
  stgToDo    		:: Maybe [StgToDo],  -- similarly
  hscTarget    		:: HscTarget,
  hscOutName 		:: String,  	-- name of the output file
  extCoreName		:: String,	-- name of the .core output file
  verbosity  		:: Int,	 	-- verbosity level
  optLevel		:: Int,		-- optimisation level
  maxSimplIterations    :: Int,		-- max simplifier iterations
  ruleCheck		:: Maybe String,
239 240

  specThreshold		:: Int,		-- Threshold for function specialisation
241

242 243 244
  stolen_x86_regs	:: Int,		
  cmdlineHcIncludes	:: [String],	-- -#includes
  importPaths		:: [FilePath],
245
  mainModIs		:: Module,
246
  mainFunIs		:: Maybe String,
247 248
  ctxtStkDepth	        :: Int,		-- Typechecker context stack depth

Simon Marlow's avatar
Simon Marlow committed
249
  thisPackage		:: PackageId,
250 251 252 253 254 255 256

  -- ways
  wayNames		:: [WayName],	-- way flags from the cmd line
  buildTag		:: String,	-- the global "way" (eg. "p" for prof)
  rtsBuildTag		:: String,	-- the RTS "way"
  
  -- paths etc.
257 258 259 260
  objectDir		:: Maybe String,
  hiDir			:: Maybe String,
  stubDir		:: Maybe String,

261 262 263
  objectSuf		:: String,
  hcSuf			:: String,
  hiSuf			:: String,
264 265 266 267

  outputFile		:: Maybe String,
  outputHi		:: Maybe String,

268 269 270 271
  includePaths		:: [String],
  libraryPaths		:: [String],
  frameworkPaths	:: [String],  	-- used on darwin only
  cmdlineFrameworks	:: [String],	-- ditto
272
  tmpDir		:: String,	-- no trailing '/'
273
  
274 275 276
  ghcUsagePath          :: FilePath,    -- Filled in by SysTools
  ghciUsagePath         :: FilePath,    -- ditto

andy@galois.com's avatar
andy@galois.com committed
277 278
  hpcDir		:: String,	-- ^ path to store the .mix files

279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299
  -- options for particular phases
  opt_L			:: [String],
  opt_P			:: [String],
  opt_F			:: [String],
  opt_c			:: [String],
  opt_m			:: [String],
  opt_a			:: [String],
  opt_l			:: [String],
  opt_dll		:: [String],
  opt_dep		:: [String],

  -- commands for particular phases
  pgm_L			:: String,
  pgm_P			:: (String,[Option]),
  pgm_F			:: String,
  pgm_c			:: (String,[Option]),
  pgm_m			:: (String,[Option]),
  pgm_s			:: (String,[Option]),
  pgm_a			:: (String,[Option]),
  pgm_l			:: (String,[Option]),
  pgm_dll		:: (String,[Option]),
300 301
  pgm_T                 :: String,
  pgm_sysman            :: String,
302

303
  --  Package flags
304
  extraPkgConfs		:: [FilePath],
305 306
  topDir                :: FilePath,    -- filled in by SysTools
  systemPackageConfig   :: FilePath,    -- ditto
307 308 309 310 311 312
	-- The -package-conf flags given on the command line, in the order
	-- they appeared.

  packageFlags		:: [PackageFlag],
	-- The -package and -hide-package flags from the command-line

313 314 315 316
  -- Package state
  -- NB. do not modify this field, it is calculated by 
  -- Packages.initPackages and Packages.updatePackages.
  pkgDatabase           :: Maybe (UniqFM InstalledPackageInfo),
317 318 319
  pkgState		:: PackageState,

  -- hsc dynamic flags
320 321 322 323
  flags      		:: [DynFlag],
  
  -- message output
  log_action            :: Severity -> SrcSpan -> PprStyle -> Message -> IO ()
324 325 326 327 328 329 330 331 332 333
 }

data HscTarget
  = HscC
  | HscAsm
  | HscJava
  | HscInterpreted
  | HscNothing
  deriving (Eq, Show)

334 335 336 337 338 339 340 341 342 343 344 345
-- | will this target result in an object file on the disk?
isObjectTarget :: HscTarget -> Bool
isObjectTarget HscC     = True
isObjectTarget HscAsm   = True
isObjectTarget _        = False

-- | The 'GhcMode' tells us whether we're doing multi-module
-- compilation (controlled via the "GHC" API) or one-shot
-- (single-module) compilation.  This makes a difference primarily to
-- the "Finder": in one-shot mode we look for interface files for
-- imported modules, but in multi-module mode we look for source files
-- in order to check whether they need to be recompiled.
346
data GhcMode
347 348 349
  = CompManager         -- ^ --make, GHCi, etc.
  | OneShot		-- ^ ghc -c Foo.hs
  | MkDepend            -- ^ ghc -M, see Finder for why we need this
350 351 352 353 354 355
  deriving Eq

isOneShot :: GhcMode -> Bool
isOneShot OneShot = True
isOneShot _other  = False

356
-- | What kind of linking to do.
357
data GhcLink	-- What to do in the link step, if there is one
358 359 360
  = NoLink		-- Don't link at all
  | LinkBinary		-- Link object code into a binary
  | LinkInMemory        -- Use the in-memory dynamic linker
361
  | MkDLL		-- Make a DLL
362
  deriving Eq
363 364 365 366 367 368 369 370 371

isNoLink :: GhcLink -> Bool
isNoLink NoLink = True
isNoLink other  = False

data PackageFlag
  = ExposePackage  String
  | HidePackage    String
  | IgnorePackage  String
372
  deriving Eq
373

374 375 376 377 378
defaultHscTarget = defaultObjectTarget

-- | the 'HscTarget' value corresponding to the default way to create
-- object files on the current platform.
defaultObjectTarget
379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394
  | cGhcWithNativeCodeGen == "YES" 	=  HscAsm
  | otherwise				=  HscC

initDynFlags dflags = do
 -- someday these will be dynamic flags
 ways <- readIORef v_Ways
 build_tag <- readIORef v_Build_tag
 rts_build_tag <- readIORef v_RTS_Build_tag
 return dflags{
	wayNames	= ways,
	buildTag	= build_tag,
	rtsBuildTag	= rts_build_tag
	}

defaultDynFlags =
     DynFlags {
395 396
	ghcMode			= CompManager,
	ghcLink			= LinkBinary,
397 398 399 400 401 402 403 404 405
	coreToDo 		= Nothing,
	stgToDo			= Nothing, 
	hscTarget		= defaultHscTarget, 
	hscOutName		= "", 
	extCoreName		= "",
	verbosity		= 0, 
	optLevel		= 0,
	maxSimplIterations	= 4,
	ruleCheck		= Nothing,
406
	specThreshold		= 200,
407 408 409
	stolen_x86_regs		= 4,
	cmdlineHcIncludes	= [],
	importPaths		= ["."],
410
	mainModIs		= mAIN,
411
	mainFunIs		= Nothing,
412 413
	ctxtStkDepth		= mAX_CONTEXT_REDUCTION_DEPTH,

Simon Marlow's avatar
Simon Marlow committed
414
	thisPackage		= mainPackageId,
415

416 417 418 419
	objectDir		= Nothing,
	hiDir			= Nothing,
	stubDir			= Nothing,

420 421 422
	objectSuf		= phaseInputExt StopLn,
	hcSuf			= phaseInputExt HCc,
	hiSuf			= "hi",
423 424 425

	outputFile		= Nothing,
	outputHi		= Nothing,
426 427 428 429
	includePaths		= [],
	libraryPaths		= [],
	frameworkPaths		= [],
	cmdlineFrameworks	= [],
430
	tmpDir			= cDEFAULT_TMPDIR,
431
	
andy@galois.com's avatar
andy@galois.com committed
432 433
        hpcDir		        = ".hpc",

434 435 436 437 438 439 440 441 442 443 444 445
	opt_L			= [],
	opt_P			= [],
	opt_F			= [],
	opt_c			= [],
	opt_a			= [],
	opt_m			= [],
	opt_l			= [],
	opt_dll			= [],
	opt_dep			= [],
	
	extraPkgConfs		= [],
	packageFlags		= [],
446 447
        pkgDatabase             = Nothing,
        pkgState                = panic "no package state yet: call GHC.setSessionDynFlags",
448 449 450
	flags = [ 
    	    Opt_ReadUserPackageConf,
    
451 452 453 454
	    Opt_MonoPatBinds, 	-- Experimentally, I'm making this non-standard
				-- behaviour the default, to see if anyone notices
				-- SLPJ July 06

455 456
    	    Opt_ImplicitPrelude,
    	    Opt_MonomorphismRestriction,
457

458 459
    	    Opt_DoAsmMangling,
    
460
	    -- on by default:
461 462 463 464
	    Opt_PrintBindResult ]
	    ++ [f | (ns,f) <- optLevelFlags, 0 `elem` ns]
	    	    -- The default -O0 options
	    ++ standardWarnings,
465 466 467 468 469 470
               
        log_action = \severity srcSpan style msg -> 
                        case severity of
                          SevInfo  -> hPutStrLn stderr (show (msg style))
                          SevFatal -> hPutStrLn stderr (show (msg style))
                          _        -> hPutStrLn stderr ('\n':show ((mkLocMessage srcSpan msg) style))
471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501
      }

{- 
    Verbosity levels:
	
    0	|   print errors & warnings only
    1   |   minimal verbosity: print "compiling M ... done." for each module.
    2   |   equivalent to -dshow-passes
    3   |   equivalent to existing "ghc -v"
    4   |   "ghc -v -ddump-most"
    5   |   "ghc -v -ddump-all"
-}

dopt :: DynFlag -> DynFlags -> Bool
dopt f dflags  = f `elem` (flags dflags)

dopt_set :: DynFlags -> DynFlag -> DynFlags
dopt_set dfs f = dfs{ flags = f : flags dfs }

dopt_unset :: DynFlags -> DynFlag -> DynFlags
dopt_unset dfs f = dfs{ flags = filter (/= f) (flags dfs) }

getOpts :: DynFlags -> (DynFlags -> [a]) -> [a]
getOpts dflags opts = reverse (opts dflags)
	-- We add to the options from the front, so we need to reverse the list

getVerbFlag :: DynFlags -> String
getVerbFlag dflags 
  | verbosity dflags >= 3  = "-v" 
  | otherwise =  ""

502 503 504 505
setObjectDir  f d = d{ objectDir  = f}
setHiDir      f d = d{ hiDir      = f}
setStubDir    f d = d{ stubDir    = f}

506 507
setObjectSuf  f d = d{ objectSuf  = f}
setHiSuf      f d = d{ hiSuf      = f}
508 509 510 511
setHcSuf      f d = d{ hcSuf      = f}

setOutputFile f d = d{ outputFile = f}
setOutputHi   f d = d{ outputHi   = f}
512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560

-- XXX HACK: Prelude> words "'does not' work" ===> ["'does","not'","work"]
-- Config.hs should really use Option.
setPgmP   f d = let (pgm:args) = words f in d{ pgm_P   = (pgm, map Option args)}

setPgmL   f d = d{ pgm_L   = f}
setPgmF   f d = d{ pgm_F   = f}
setPgmc   f d = d{ pgm_c   = (f,[])}
setPgmm   f d = d{ pgm_m   = (f,[])}
setPgms   f d = d{ pgm_s   = (f,[])}
setPgma   f d = d{ pgm_a   = (f,[])}
setPgml   f d = d{ pgm_l   = (f,[])}
setPgmdll f d = d{ pgm_dll = (f,[])}

addOptL   f d = d{ opt_L   = f : opt_L d}
addOptP   f d = d{ opt_P   = f : opt_P d}
addOptF   f d = d{ opt_F   = f : opt_F d}
addOptc   f d = d{ opt_c   = f : opt_c d}
addOptm   f d = d{ opt_m   = f : opt_m d}
addOpta   f d = d{ opt_a   = f : opt_a d}
addOptl   f d = d{ opt_l   = f : opt_l d}
addOptdll f d = d{ opt_dll = f : opt_dll d}
addOptdep f d = d{ opt_dep = f : opt_dep d}

addCmdlineFramework f d = d{ cmdlineFrameworks = f : cmdlineFrameworks d}

-- -----------------------------------------------------------------------------
-- Command-line options

-- When invoking external tools as part of the compilation pipeline, we
-- pass these a sequence of options on the command-line. Rather than
-- just using a list of Strings, we use a type that allows us to distinguish
-- between filepaths and 'other stuff'. [The reason being, of course, that
-- this type gives us a handle on transforming filenames, and filenames only,
-- to whatever format they're expected to be on a particular platform.]

data Option
 = FileOption -- an entry that _contains_ filename(s) / filepaths.
              String  -- a non-filepath prefix that shouldn't be 
		      -- transformed (e.g., "/out=")
 	      String  -- the filepath/filename portion
 | Option     String
 
-----------------------------------------------------------------------------
-- Setting the optimisation level

updOptLevel :: Int -> DynFlags -> DynFlags
-- Set dynflags appropriate to the optimisation level
updOptLevel n dfs
561
  = dfs2{ optLevel = n }
562 563 564 565
  where
   dfs1 = foldr (flip dopt_unset) dfs  remove_dopts
   dfs2 = foldr (flip dopt_set)   dfs1 extra_dopts

566 567
   extra_dopts  = [ f | (ns,f) <- optLevelFlags, n `elem` ns ]
   remove_dopts = [ f | (ns,f) <- optLevelFlags, n `notElem` ns ]
568
	
569 570 571 572
optLevelFlags :: [([Int], DynFlag)]
optLevelFlags
  = [ ([0],	Opt_IgnoreInterfacePragmas)
    , ([0],     Opt_OmitInterfacePragmas)
573

574
    , ([1,2],	Opt_IgnoreAsserts)
575 576
    , ([1,2],	Opt_RewriteRules)	-- Off for -O0; see Note [Scoping for Builtin rules]
					-- 		in PrelRules
577 578 579 580 581
    , ([1,2],	Opt_DoEtaReduction)
    , ([1,2],	Opt_CaseMerge)
    , ([1,2],	Opt_Strictness)
    , ([1,2],	Opt_CSE)
    , ([1,2],	Opt_FullLaziness)
582

583 584 585 586 587 588 589 590
    , ([2],	Opt_LiberateCase)
    , ([2],	Opt_SpecConstr)

    , ([0,1,2], Opt_DoLambdaEtaExpansion)
		-- This one is important for a tiresome reason:
		-- we want to make sure that the bindings for data 
		-- constructors are eta-expanded.  This is probably
		-- a good thing anyway, but it seems fragile.
591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647
    ]

-- -----------------------------------------------------------------------------
-- Standard sets of warning options

standardWarnings
    = [ Opt_WarnDeprecations,
	Opt_WarnOverlappingPatterns,
	Opt_WarnMissingFields,
	Opt_WarnMissingMethods,
	Opt_WarnDuplicateExports
      ]

minusWOpts
    = standardWarnings ++ 
      [	Opt_WarnUnusedBinds,
	Opt_WarnUnusedMatches,
	Opt_WarnUnusedImports,
	Opt_WarnIncompletePatterns,
	Opt_WarnDodgyImports
      ]

minusWallOpts
    = minusWOpts ++
      [	Opt_WarnTypeDefaults,
	Opt_WarnNameShadowing,
	Opt_WarnMissingSigs,
	Opt_WarnHiShadows,
	Opt_WarnOrphans
      ]

-- -----------------------------------------------------------------------------
-- CoreToDo:  abstraction of core-to-core passes to run.

data CoreToDo		-- These are diff core-to-core passes,
			-- which may be invoked in any order,
  			-- as many times as you like.

  = CoreDoSimplify	-- The core-to-core simplifier.
	SimplifierMode
	[SimplifierSwitch]
			-- Each run of the simplifier can take a different
			-- set of simplifier-specific flags.
  | CoreDoFloatInwards
  | CoreDoFloatOutwards FloatOutSwitches
  | CoreLiberateCase
  | CoreDoPrintCore
  | CoreDoStaticArgs
  | CoreDoStrictness
  | CoreDoWorkerWrapper
  | CoreDoSpecialising
  | CoreDoSpecConstr
  | CoreDoOldStrictness
  | CoreDoGlomBinds
  | CoreCSE
  | CoreDoRuleCheck Int{-CompilerPhase-} String	-- Check for non-application of rules 
						-- matching this string
648 649
  | CoreDoNothing 		 -- Useful when building up 
  | CoreDoPasses [CoreToDo] 	 -- lists of these things
650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665

data SimplifierMode 		-- See comments in SimplMonad
  = SimplGently
  | SimplPhase Int

data SimplifierSwitch
  = MaxSimplifierIterations Int
  | NoCaseOfCase

data FloatOutSwitches
  = FloatOutSw  Bool 	-- True <=> float lambdas to top level
		Bool	-- True <=> float constants to top level,
			-- 	    even if they do not escape a lambda


-- The core-to-core pass ordering is derived from the DynFlags:
666 667 668
runWhen :: Bool -> CoreToDo -> CoreToDo
runWhen True  do_this = do_this
runWhen False do_this = CoreDoNothing
669 670 671 672 673 674 675 676 677 678 679

getCoreToDo :: DynFlags -> [CoreToDo]
getCoreToDo dflags
  | Just todo <- coreToDo dflags = todo -- set explicitly by user
  | otherwise = core_todo
  where
    opt_level  	  = optLevel dflags
    max_iter   	  = maxSimplIterations dflags
    strictness    = dopt Opt_Strictness dflags
    full_laziness = dopt Opt_FullLaziness dflags
    cse           = dopt Opt_CSE dflags
680 681
    spec_constr   = dopt Opt_SpecConstr dflags
    liberate_case = dopt Opt_LiberateCase dflags
682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704
    rule_check    = ruleCheck dflags

    core_todo = 
     if opt_level == 0 then
      [
	CoreDoSimplify (SimplPhase 0) [
	    MaxSimplifierIterations max_iter
	]
      ]
     else {- opt_level >= 1 -} [ 

	-- initial simplify: mk specialiser happy: minimum effort please
	CoreDoSimplify SimplGently [
			-- 	Simplify "gently"
			-- Don't inline anything till full laziness has bitten
			-- In particular, inlining wrappers inhibits floating
			-- e.g. ...(case f x of ...)...
			--  ==> ...(case (case x of I# x# -> fw x#) of ...)...
			--  ==> ...(case x of I# x# -> case fw x# of ...)...
			-- and now the redex (f x) isn't floatable any more
			-- Similarly, don't apply any rules until after full 
			-- laziness.  Notably, list fusion can prevent floating.

simonpj@microsoft.com's avatar
simonpj@microsoft.com committed
705 706
            NoCaseOfCase,	-- Don't do case-of-case transformations.
				-- This makes full laziness work better
707 708 709 710 711 712 713
	    MaxSimplifierIterations max_iter
	],

	-- Specialisation is best done before full laziness
	-- so that overloaded functions have all their dictionary lambdas manifest
	CoreDoSpecialising,

714
	runWhen full_laziness (CoreDoFloatOutwards (FloatOutSw False False)),
715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752

	CoreDoFloatInwards,

	CoreDoSimplify (SimplPhase 2) [
		-- Want to run with inline phase 2 after the specialiser to give
		-- maximum chance for fusion to work before we inline build/augment
		-- in phase 1.  This made a difference in 'ansi' where an 
		-- overloaded function wasn't inlined till too late.
	   MaxSimplifierIterations max_iter
	],
	case rule_check of { Just pat -> CoreDoRuleCheck 2 pat; Nothing -> CoreDoNothing },

	CoreDoSimplify (SimplPhase 1) [
		-- Need inline-phase2 here so that build/augment get 
		-- inlined.  I found that spectral/hartel/genfft lost some useful
		-- strictness in the function sumcode' if augment is not inlined
		-- before strictness analysis runs
	   MaxSimplifierIterations max_iter
	],
	case rule_check of { Just pat -> CoreDoRuleCheck 1 pat; Nothing -> CoreDoNothing },

	CoreDoSimplify (SimplPhase 0) [
		-- Phase 0: allow all Ids to be inlined now
		-- This gets foldr inlined before strictness analysis

	   MaxSimplifierIterations 3
		-- At least 3 iterations because otherwise we land up with
		-- huge dead expressions because of an infelicity in the 
		-- simpifier.   
		--	let k = BIG in foldr k z xs
		-- ==>  let k = BIG in letrec go = \xs -> ...(k x).... in go xs
		-- ==>  let k = BIG in letrec go = \xs -> ...(BIG x).... in go xs
		-- Don't stop now!

	],
	case rule_check of { Just pat -> CoreDoRuleCheck 0 pat; Nothing -> CoreDoNothing },

#ifdef OLD_STRICTNESS
753
	CoreDoOldStrictness,
754
#endif
755 756 757 758 759 760 761 762 763 764 765
	runWhen strictness (CoreDoPasses [
		CoreDoStrictness,
		CoreDoWorkerWrapper,
		CoreDoGlomBinds,
		CoreDoSimplify (SimplPhase 0) [
		   MaxSimplifierIterations max_iter
		]]),

	runWhen full_laziness 
	  (CoreDoFloatOutwards (FloatOutSw False    -- Not lambdas
					   True)),  -- Float constants
766 767 768 769 770 771 772
		-- nofib/spectral/hartel/wang doubles in speed if you
		-- do full laziness late in the day.  It only happens
		-- after fusion and other stuff, so the early pass doesn't
		-- catch it.  For the record, the redex is 
		--	  f_el22 (f_el21 r_midblock)


773 774 775 776
	runWhen cse CoreCSE,
		-- We want CSE to follow the final full-laziness pass, because it may
		-- succeed in commoning up things floated out by full laziness.
		-- CSE used to rely on the no-shadowing invariant, but it doesn't any more
777 778 779

	CoreDoFloatInwards,

780
	case rule_check of { Just pat -> CoreDoRuleCheck 0 pat; Nothing -> CoreDoNothing },
781

782 783 784 785 786
		-- Case-liberation for -O2.  This should be after
		-- strictness analysis and the simplification which follows it.
	runWhen liberate_case (CoreDoPasses [
	    CoreLiberateCase,
	    CoreDoSimplify (SimplPhase 0) [
787
		  MaxSimplifierIterations max_iter
788
	    ] ]),	-- Run the simplifier after LiberateCase to vastly 
789 790 791
			-- reduce the possiblility of shadowing
			-- Reason: see Note [Shadowing] in SpecConstr.lhs

792
	runWhen spec_constr CoreDoSpecConstr,
793 794

	-- Final clean-up simplification:
795
     	CoreDoSimplify (SimplPhase 0) [
796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825
	  MaxSimplifierIterations max_iter
	]
     ]

-- -----------------------------------------------------------------------------
-- StgToDo:  abstraction of stg-to-stg passes to run.

data StgToDo
  = StgDoMassageForProfiling  -- should be (next to) last
  -- There's also setStgVarInfo, but its absolute "lastness"
  -- is so critical that it is hardwired in (no flag).
  | D_stg_stats

getStgToDo :: DynFlags -> [StgToDo]
getStgToDo dflags
  | Just todo <- stgToDo dflags = todo -- set explicitly by user
  | otherwise = todo2
  where
	stg_stats = dopt Opt_StgStats dflags

	todo1 = if stg_stats then [D_stg_stats] else []

	todo2 | WayProf `elem` wayNames dflags
	      = StgDoMassageForProfiling : todo1
	      | otherwise
	      = todo1

-- -----------------------------------------------------------------------------
-- DynFlags parser

826 827 828 829 830 831 832 833 834
allFlags :: [String]
allFlags = map ('-':) $
           [ name | (name, optkind) <- dynamic_flags, ok optkind ] ++
           map ("fno-"++) flags ++
           map ("f"++) flags
    where ok (PrefixPred _ _) = False
          ok _ = True
          flags = map fst fFlags

835 836 837 838 839 840
dynamic_flags :: [(String, OptKind DynP)]
dynamic_flags = [
     ( "n"              , NoArg  (setDynFlag Opt_DryRun) )
  ,  ( "cpp"		, NoArg  (setDynFlag Opt_Cpp))
  ,  ( "F"		, NoArg  (setDynFlag Opt_Pp))
  ,  ( "#include"	, HasArg (addCmdlineHCInclude) )
841
  ,  ( "v"		, OptIntSuffix setVerbosity )
Ian Lynagh's avatar
Ian Lynagh committed
842 843
  ,  ( "short-ghci-banner", NoArg (setDynFlag Opt_ShortGhciBanner) )
  ,  ( "long-ghci-banner" , NoArg (unSetDynFlag Opt_ShortGhciBanner) )
844

845 846 847 848 849 850 851 852 853 854 855 856 857 858
        ------- Specific phases  --------------------------------------------
  ,  ( "pgmL"           , HasArg (upd . setPgmL) )  
  ,  ( "pgmP"           , HasArg (upd . setPgmP) )  
  ,  ( "pgmF"           , HasArg (upd . setPgmF) )  
  ,  ( "pgmc"           , HasArg (upd . setPgmc) )  
  ,  ( "pgmm"           , HasArg (upd . setPgmm) )  
  ,  ( "pgms"           , HasArg (upd . setPgms) )  
  ,  ( "pgma"           , HasArg (upd . setPgma) )  
  ,  ( "pgml"           , HasArg (upd . setPgml) )  
  ,  ( "pgmdll"		, HasArg (upd . setPgmdll) )

  ,  ( "optL"		, HasArg (upd . addOptL) )  
  ,  ( "optP"		, HasArg (upd . addOptP) )  
  ,  ( "optF"           , HasArg (upd . addOptF) )  
859
  ,  ( "optc"		, HasArg (upd . addOptc) )  
860 861 862 863 864 865
  ,  ( "optm"		, HasArg (upd . addOptm) )  
  ,  ( "opta"		, HasArg (upd . addOpta) )  
  ,  ( "optl"		, HasArg (upd . addOptl) )  
  ,  ( "optdll"		, HasArg (upd . addOptdll) )  
  ,  ( "optdep"		, HasArg (upd . addOptdep) )

866 867 868 869
  ,  ( "split-objs"	, NoArg (if can_split
				    then setDynFlag Opt_SplitObjs
				    else return ()) )

870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885
	-------- Linking ----------------------------------------------------
  ,  ( "c"		, NoArg (upd $ \d -> d{ ghcLink=NoLink } ))
  ,  ( "no-link"	, NoArg (upd $ \d -> d{ ghcLink=NoLink } )) -- Dep.
  ,  ( "-mk-dll"	, NoArg (upd $ \d -> d{ ghcLink=MkDLL } ))

	------- Libraries ---------------------------------------------------
  ,  ( "L"		, Prefix addLibraryPath )
  ,  ( "l"		, AnySuffix (\s -> do upd (addOptl s)
					      upd (addOptdll s)))

	------- Frameworks --------------------------------------------------
        -- -framework-path should really be -F ...
  ,  ( "framework-path" , HasArg addFrameworkPath )
  ,  ( "framework"	, HasArg (upd . addCmdlineFramework) )

	------- Output Redirection ------------------------------------------
886
  ,  ( "odir"		, HasArg (upd . setObjectDir  . Just))
887 888 889 890 891 892 893
  ,  ( "o"		, SepArg (upd . setOutputFile . Just))
  ,  ( "ohi"		, HasArg (upd . setOutputHi   . Just ))
  ,  ( "osuf"		, HasArg (upd . setObjectSuf))
  ,  ( "hcsuf"		, HasArg (upd . setHcSuf))
  ,  ( "hisuf"		, HasArg (upd . setHiSuf))
  ,  ( "hidir"		, HasArg (upd . setHiDir . Just))
  ,  ( "tmpdir"		, HasArg (upd . setTmpDir))
894
  ,  ( "stubdir"	, HasArg (upd . setStubDir . Just))
895 896

	------- Keeping temporary files -------------------------------------
897 898
  ,  ( "keep-hc-file"   , AnySuffix (\_ -> setDynFlag Opt_KeepHcFiles))
  ,  ( "keep-s-file"    , AnySuffix (\_ -> setDynFlag Opt_KeepSFiles))
899 900 901 902 903 904
  ,  ( "keep-raw-s-file", AnySuffix (\_ -> setDynFlag Opt_KeepRawSFiles))
  ,  ( "keep-tmp-files" , AnySuffix (\_ -> setDynFlag Opt_KeepTmpFiles))

	------- Miscellaneous ----------------------------------------------
  ,  ( "no-hs-main"     , NoArg (setDynFlag Opt_NoHsMain))
  ,  ( "main-is"   	, SepArg setMainIs )
905
  ,  ( "haddock"	, NoArg (setDynFlag Opt_Haddock) )
andy@galois.com's avatar
andy@galois.com committed
906
  ,  ( "hpcdir"		, SepArg setOptHpcDir )
907

908 909 910
	------- recompilation checker (DEPRECATED, use -fforce-recomp) -----
  ,  ( "recomp"		, NoArg (unSetDynFlag Opt_ForceRecomp) )
  ,  ( "no-recomp"  	, NoArg (setDynFlag   Opt_ForceRecomp) )
911 912 913 914

        ------- Packages ----------------------------------------------------
  ,  ( "package-conf"   , HasArg extraPkgConf_ )
  ,  ( "no-user-package-conf", NoArg (unSetDynFlag Opt_ReadUserPackageConf) )
915
  ,  ( "package-name"   , HasArg (upd . setPackageName) )
916 917
  ,  ( "package"        , HasArg exposePackage )
  ,  ( "hide-package"   , HasArg hidePackage )
918
  ,  ( "hide-all-packages", NoArg (setDynFlag Opt_HideAllPackages) )
919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940
  ,  ( "ignore-package" , HasArg ignorePackage )
  ,  ( "syslib"         , HasArg exposePackage )  -- for compatibility

	------ HsCpp opts ---------------------------------------------------
  ,  ( "D",		AnySuffix (upd . addOptP) )
  ,  ( "U",		AnySuffix (upd . addOptP) )

	------- Include/Import Paths ----------------------------------------
  ,  ( "I" 		, Prefix    addIncludePath)
  ,  ( "i"		, OptPrefix addImportPath )

	------ Debugging ----------------------------------------------------
  ,  ( "dstg-stats",	NoArg (setDynFlag Opt_StgStats))

  ,  ( "ddump-cmm",         	 setDumpFlag Opt_D_dump_cmm)
  ,  ( "ddump-asm",          	 setDumpFlag Opt_D_dump_asm)
  ,  ( "ddump-cpranal",      	 setDumpFlag Opt_D_dump_cpranal)
  ,  ( "ddump-deriv",        	 setDumpFlag Opt_D_dump_deriv)
  ,  ( "ddump-ds",           	 setDumpFlag Opt_D_dump_ds)
  ,  ( "ddump-flatC",        	 setDumpFlag Opt_D_dump_flatC)
  ,  ( "ddump-foreign",      	 setDumpFlag Opt_D_dump_foreign)
  ,  ( "ddump-inlinings",    	 setDumpFlag Opt_D_dump_inlinings)
941
  ,  ( "ddump-rule-firings",   	 setDumpFlag Opt_D_dump_rule_firings)
942 943 944 945 946 947 948 949 950 951 952 953 954 955
  ,  ( "ddump-occur-anal",   	 setDumpFlag Opt_D_dump_occur_anal)
  ,  ( "ddump-parsed",       	 setDumpFlag Opt_D_dump_parsed)
  ,  ( "ddump-rn",           	 setDumpFlag Opt_D_dump_rn)
  ,  ( "ddump-simpl",        	 setDumpFlag Opt_D_dump_simpl)
  ,  ( "ddump-simpl-iterations", setDumpFlag Opt_D_dump_simpl_iterations)
  ,  ( "ddump-spec",         	 setDumpFlag Opt_D_dump_spec)
  ,  ( "ddump-prep",          	 setDumpFlag Opt_D_dump_prep)
  ,  ( "ddump-stg",          	 setDumpFlag Opt_D_dump_stg)
  ,  ( "ddump-stranal",      	 setDumpFlag Opt_D_dump_stranal)
  ,  ( "ddump-tc",           	 setDumpFlag Opt_D_dump_tc)
  ,  ( "ddump-types",        	 setDumpFlag Opt_D_dump_types)
  ,  ( "ddump-rules",        	 setDumpFlag Opt_D_dump_rules)
  ,  ( "ddump-cse",          	 setDumpFlag Opt_D_dump_cse)
  ,  ( "ddump-worker-wrapper",   setDumpFlag Opt_D_dump_worker_wrapper)
956 957
  ,  ( "ddump-rn-trace",         setDumpFlag Opt_D_dump_rn_trace)
  ,  ( "ddump-if-trace",         setDumpFlag Opt_D_dump_if_trace)
958 959
  ,  ( "ddump-tc-trace",         setDumpFlag Opt_D_dump_tc_trace)
  ,  ( "ddump-splices",          setDumpFlag Opt_D_dump_splices)
960
  ,  ( "ddump-rn-stats",         setDumpFlag Opt_D_dump_rn_stats)
961 962 963 964 965 966
  ,  ( "ddump-opt-cmm",          setDumpFlag Opt_D_dump_opt_cmm)
  ,  ( "ddump-simpl-stats",      setDumpFlag Opt_D_dump_simpl_stats)
  ,  ( "ddump-bcos",             setDumpFlag Opt_D_dump_BCOs)
  ,  ( "dsource-stats",          setDumpFlag Opt_D_source_stats)
  ,  ( "dverbose-core2core",     setDumpFlag Opt_D_verbose_core2core)
  ,  ( "dverbose-stg2stg",       setDumpFlag Opt_D_verbose_stg2stg)
967
  ,  ( "ddump-hi-diffs",         setDumpFlag Opt_D_dump_hi_diffs)
968
  ,  ( "ddump-hi",               setDumpFlag Opt_D_dump_hi)
969
  ,  ( "ddump-minimal-imports",  setDumpFlag Opt_D_dump_minimal_imports)
970
  ,  ( "ddump-vect",         	 setDumpFlag Opt_D_dump_vect)
andy@galois.com's avatar
andy@galois.com committed
971
  ,  ( "ddump-hpc",         	 setDumpFlag Opt_D_dump_hpc)
972
  ,  ( "ddump-mod-cycles",     	 setDumpFlag Opt_D_dump_mod_cycles)
andy@galois.com's avatar
andy@galois.com committed
973
  
974 975 976
  ,  ( "dcore-lint",       	 NoArg (setDynFlag Opt_DoCoreLinting))
  ,  ( "dstg-lint",        	 NoArg (setDynFlag Opt_DoStgLinting))
  ,  ( "dcmm-lint",		 NoArg (setDynFlag Opt_DoCmmLinting))
977
  ,  ( "dshow-passes",           NoArg (do setDynFlag Opt_ForceRecomp
978
				           setVerbosity (Just 2)) )
979
  ,  ( "dfaststring-stats",	 NoArg (setDynFlag Opt_D_faststring_stats))
980 981 982 983 984 985 986 987 988 989 990 991 992 993 994

	------ Machine dependant (-m<blah>) stuff ---------------------------

  ,  ( "monly-2-regs", 	NoArg (upd (\s -> s{stolen_x86_regs = 2}) ))
  ,  ( "monly-3-regs", 	NoArg (upd (\s -> s{stolen_x86_regs = 3}) ))
  ,  ( "monly-4-regs", 	NoArg (upd (\s -> s{stolen_x86_regs = 4}) ))

	------ Warning opts -------------------------------------------------
  ,  ( "W"		, NoArg (mapM_ setDynFlag   minusWOpts)    )
  ,  ( "Werror"		, NoArg (setDynFlag   	    Opt_WarnIsError) )
  ,  ( "Wall"		, NoArg (mapM_ setDynFlag   minusWallOpts) )
  ,  ( "Wnot"		, NoArg (mapM_ unSetDynFlag minusWallOpts) ) /* DEPREC */
  ,  ( "w"		, NoArg (mapM_ unSetDynFlag minusWallOpts) )

	------ Optimisation flags ------------------------------------------
995 996 997 998
  ,  ( "O"	, NoArg (upd (setOptLevel 1)))
  ,  ( "Onot"	, NoArg (upd (setOptLevel 0)))
  ,  ( "O"	, OptIntSuffix (\mb_n -> upd (setOptLevel (mb_n `orElse` 1))))
		-- If the number is missing, use 1
999

1000 1001
  ,  ( "fmax-simplifier-iterations", IntSuffix (\n -> 
		upd (\dfs -> dfs{ maxSimplIterations = n })) )
1002 1003 1004 1005 1006

	-- liberate-case-threshold is an old flag for '-fspec-threshold'
  ,  ( "fspec-threshold",          IntSuffix (\n -> upd (\dfs -> dfs{ specThreshold = n })))
  ,  ( "fliberate-case-threshold", IntSuffix (\n -> upd (\dfs -> dfs{ specThreshold = n })))

1007 1008
  ,  ( "frule-check", SepArg (\s -> upd (\dfs -> dfs{ ruleCheck = Just s })))
  ,  ( "fcontext-stack"	, IntSuffix $ \n -> upd $ \dfs -> dfs{ ctxtStkDepth = n })
1009 1010 1011

        ------ Compiler flags -----------------------------------------------

1012 1013 1014 1015
  ,  ( "fasm",		AnySuffix (\_ -> setObjTarget HscAsm) )
  ,  ( "fvia-c",	NoArg (setObjTarget HscC) )
  ,  ( "fvia-C",	NoArg (setObjTarget HscC) )

1016
  ,  ( "fno-code",	NoArg (setTarget HscNothing))
1017 1018
  ,  ( "fbyte-code",    NoArg (setTarget HscInterpreted) )
  ,  ( "fobject-code",  NoArg (setTarget defaultHscTarget) )
1019 1020 1021 1022 1023

  ,  ( "fglasgow-exts",    NoArg (mapM_ setDynFlag   glasgowExtsFlags) )
  ,  ( "fno-glasgow-exts", NoArg (mapM_ unSetDynFlag glasgowExtsFlags) )

	-- the rest of the -f* and -fno-* flags
1024 1025 1026 1027
  ,  ( "f",		PrefixPred (isFlag fFlags)   (\f -> setDynFlag   (getFlag fFlags f)) )
  ,  ( "f", 		PrefixPred (isNoFlag fFlags) (\f -> unSetDynFlag (getNoFlag fFlags f)) )

	-- For now, allow -X flags with -f; ToDo: report this as deprecated
1028
  ,  ( "f",		PrefixPred (isFlag xFlags) (\f ->  setDynFlag (getFlag xFlags f)) )
1029
  ,  ( "f", 		PrefixPred (isNoFlag xFlags) (\f -> unSetDynFlag (getNoFlag xFlags f)) )
1030 1031 1032 1033

	-- the rest of the -X* and -Xno-* flags
  ,  ( "X",		PrefixPred (isFlag xFlags)   (\f -> setDynFlag   (getFlag xFlags f)) )
  ,  ( "X", 		PrefixPred (isNoFlag xFlags) (\f -> unSetDynFlag (getNoFlag xFlags f)) )
1034 1035 1036 1037 1038 1039 1040
 ]

-- these -f<blah> flags can all be reversed with -fno-<blah>

fFlags = [
  ( "warn-duplicate-exports",    	Opt_WarnDuplicateExports ),
  ( "warn-hi-shadowing",         	Opt_WarnHiShadows ),
1041
  ( "warn-implicit-prelude",            Opt_WarnImplicitPrelude ),
1042 1043 1044 1045 1046 1047 1048 1049 1050
  ( "warn-incomplete-patterns",  	Opt_WarnIncompletePatterns ),
  ( "warn-incomplete-record-updates",  	Opt_WarnIncompletePatternsRecUpd ),
  ( "warn-missing-fields",       	Opt_WarnMissingFields ),
  ( "warn-missing-methods",      	Opt_WarnMissingMethods ),
  ( "warn-missing-signatures",   	Opt_WarnMissingSigs ),
  ( "warn-name-shadowing",       	Opt_WarnNameShadowing ),
  ( "warn-overlapping-patterns", 	Opt_WarnOverlappingPatterns ),
  ( "warn-simple-patterns",      	Opt_WarnSimplePatterns ),
  ( "warn-type-defaults",        	Opt_WarnTypeDefaults ),
1051
  ( "warn-monomorphism-restriction",   	Opt_WarnMonomorphism ),
1052 1053 1054 1055 1056
  ( "warn-unused-binds",         	Opt_WarnUnusedBinds ),
  ( "warn-unused-imports",       	Opt_WarnUnusedImports ),
  ( "warn-unused-matches",       	Opt_WarnUnusedMatches ),
  ( "warn-deprecations",         	Opt_WarnDeprecations ),
  ( "warn-orphans",	         	Opt_WarnOrphans ),
1057
  ( "warn-tabs",	         	Opt_WarnTabs ),
1058 1059
  ( "strictness",			Opt_Strictness ),
  ( "full-laziness",			Opt_FullLaziness ),
1060 1061
  ( "liberate-case",			Opt_LiberateCase ),
  ( "spec-constr",			Opt_SpecConstr ),
1062 1063 1064 1065 1066
  ( "cse",				Opt_CSE ),
  ( "ignore-interface-pragmas",		Opt_IgnoreInterfacePragmas ),
  ( "omit-interface-pragmas",		Opt_OmitInterfacePragmas ),
  ( "do-lambda-eta-expansion",		Opt_DoLambdaEtaExpansion ),
  ( "ignore-asserts",			Opt_IgnoreAsserts ),
1067
  ( "ignore-breakpoints",               Opt_IgnoreBreakpoints),
1068 1069 1070
  ( "do-eta-reduction",			Opt_DoEtaReduction ),
  ( "case-merge",			Opt_CaseMerge ),
  ( "unbox-strict-fields",		Opt_UnboxStrictFields ),
1071
  ( "dicts-cheap",			Opt_DictsCheap ),
1072
  ( "excess-precision",			Opt_ExcessPrecision ),
1073
  ( "asm-mangling",			Opt_DoAsmMangling ),
1074
  ( "print-bind-result",		Opt_PrintBindResult ),
1075
  ( "force-recomp",			Opt_ForceRecomp ),
1076
  ( "hpc-no-auto",			Opt_Hpc_No_Auto ),
1077 1078
  ( "rewrite-rules",			Opt_RewriteRules ),
  ( "break-on-exception",               Opt_BreakOnException )
1079 1080
  ]

1081

1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128
-- These -X<blah> flags can all be reversed with -Xno-<blah>
xFlags :: [(String, DynFlag)]
xFlags = [
  ( "FI",				Opt_FFI ),  -- support `-ffi'...
  ( "FFI",				Opt_FFI ),  -- ...and also `-fffi'
  ( "ForeignFunctionInterface",		Opt_FFI ),  -- ...and also `-fffi'

  ( "Arrows",				Opt_Arrows ), -- arrow syntax
  ( "Parr",				Opt_PArr ),

  ( "TH",				Opt_TH ),
  ( "TemplateHaskelll",			Opt_TH ),

  ( "Generics",  			Opt_Generics ),

  ( "ImplicitPrelude",  		Opt_ImplicitPrelude ),	-- On by default

  ( "OverloadedStrings",		Opt_OverloadedStrings ),
  ( "GADTs",		  		Opt_GADTs ),
  ( "TypeFamilies",	  		Opt_TypeFamilies ),
  ( "BangPatterns",	  		Opt_BangPatterns ),
  ( "MonomorphismRestriction",		Opt_MonomorphismRestriction ),	-- On by default
  ( "MonoPatBinds",			Opt_MonoPatBinds ),		-- On by default (which is not strictly H98)
  ( "RelaxedPolyRec", 			Opt_RelaxedPolyRec),
  ( "ExtendedDefaultRules",		Opt_ExtendedDefaultRules ),
  ( "ImplicitParams",			Opt_ImplicitParams ),
  ( "ScopedTypeVariables",  		Opt_ScopedTypeVariables ),
  ( "AllowOverlappingInstances", 	Opt_AllowOverlappingInstances ),
  ( "AllowUndecidableInstances", 	Opt_AllowUndecidableInstances ),
  ( "AllowIncoherentInstances", 	Opt_AllowIncoherentInstances )
  ]

impliedFlags :: [(DynFlag, [DynFlag])]
impliedFlags = [
  ( Opt_GADTs, [Opt_RelaxedPolyRec] )	-- We want type-sig variables to be completely rigid for GADTs
  ]

glasgowExtsFlags = [ Opt_GlasgowExts 
		   , Opt_FFI 
		   , Opt_ImplicitParams 
		   , Opt_ScopedTypeVariables
		   , Opt_TypeFamilies ]

------------------
isNoFlag, isFlag :: [(String,a)] -> String -> Bool

isFlag flags f = is_flag flags (normaliseFlag f)
1129

1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141
isNoFlag flags no_f
  | Just f <- noFlag_maybe (normaliseFlag no_f) = is_flag flags f
  | otherwise					= False

is_flag flags nf = any (\(ff,_) -> normaliseFlag ff == nf) flags
	-- nf is normalised alreadly

------------------
getFlag, getNoFlag :: [(String,a)] -> String -> a

getFlag flags f = get_flag flags (normaliseFlag f)

1142
getNoFlag flags f = get_flag flags (fromJust (noFlag_maybe (normaliseFlag f)))
1143 1144
			-- The flag should be a no-flag already

1145 1146 1147
get_flag flags nf = case [ opt | (ff, opt) <- flags, normaliseFlag ff == nf] of
			(o:os) -> o
			[]     -> panic ("get_flag " ++ nf)
1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162

------------------
noFlag_maybe :: String -> Maybe String
-- The input is normalised already
noFlag_maybe ('n' : 'o' : f) = Just f
noFlag_maybe other	     = Nothing

normaliseFlag :: String -> String
-- Normalise a option flag by
--	* map to lower case
--	* removing hyphens
-- Thus: -X=overloaded-strings or -XOverloadedStrings
normaliseFlag []      = []
normaliseFlag ('-':s) = normaliseFlag s
normaliseFlag (c:s)   = toLower c : normaliseFlag s
1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182

-- -----------------------------------------------------------------------------
-- Parsing the dynamic flags.

parseDynamicFlags :: DynFlags -> [String] -> IO (DynFlags,[String])
parseDynamicFlags dflags args = do
  let ((leftover,errs),dflags') 
	  = runCmdLine (processArgs dynamic_flags args) dflags
  when (not (null errs)) $ do
    throwDyn (UsageError (unlines errs))
  return (dflags', leftover)


type DynP = CmdLineP DynFlags

upd :: (DynFlags -> DynFlags) -> DynP ()
upd f = do 
   dfs <- getCmdLineState
   putCmdLineState $! (f dfs)

1183
--------------------------
1184
setDynFlag, unSetDynFlag :: DynFlag -> DynP ()
1185 1186 1187 1188 1189 1190 1191
setDynFlag f = upd (\dfs -> foldl dopt_set (dopt_set dfs f) deps)
  where
    deps = [ d | (f', ds) <- impliedFlags, f' == f, d <- ds ]
	-- When you set f, set the ones it implies
	-- When you un-set f, however, we don't un-set the things it implies
	--	(except for -fno-glasgow-exts, which is treated specially)

1192 1193
unSetDynFlag f = upd (\dfs -> dopt_unset dfs f)

1194
--------------------------
1195 1196
setDumpFlag :: DynFlag -> OptKind DynP
setDumpFlag dump_flag 
1197
  = NoArg (setDynFlag Opt_ForceRecomp >> setDynFlag dump_flag)
1198 1199 1200
	-- Whenver we -ddump, switch off the recompilation checker,
	-- else you don't see the dump!

1201 1202
setVerbosity :: Maybe Int -> DynP ()
setVerbosity mb_n = upd (\dfs -> dfs{ verbosity = mb_n `orElse` 3 })
1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213

addCmdlineHCInclude a = upd (\s -> s{cmdlineHcIncludes =  a : cmdlineHcIncludes s})

extraPkgConf_  p = upd (\s -> s{ extraPkgConfs = p : extraPkgConfs s })

exposePackage p = 
  upd (\s -> s{ packageFlags = ExposePackage p : packageFlags s })
hidePackage p = 
  upd (\s -> s{ packageFlags = HidePackage p : packageFlags s })
ignorePackage p = 
  upd (\s -> s{ packageFlags = IgnorePackage p : packageFlags s })
1214

Simon Marlow's avatar
Simon Marlow committed
1215 1216 1217 1218
setPackageName p
  | Nothing <- unpackPackageId pid
  = throwDyn (CmdLineError ("cannot parse \'" ++ p ++ "\' as a package identifier"))
  | otherwise
1219
  = \s -> s{ thisPackage = pid }
Simon Marlow's avatar
Simon Marlow committed
1220 1221
  where
        pid = stringToPackageId p
1222

1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239
-- If we're linking a binary, then only targets that produce object
-- code are allowed (requests for other target types are ignored).
setTarget l = upd set
  where 
   set dfs 
     | ghcLink dfs /= LinkBinary || isObjectTarget l  = dfs{ hscTarget = l }
     | otherwise = dfs

-- Changes the target only if we're compiling object code.  This is
-- used by -fasm and -fvia-C, which switch from one to the other, but
-- not from bytecode to object-code.  The idea is that -fasm/-fvia-C
-- can be safely used in an OPTIONS_GHC pragma.
setObjTarget l = upd set
  where 
   set dfs 
     | isObjectTarget (hscTarget dfs) = dfs { hscTarget = l }
     | otherwise = dfs
1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252

setOptLevel :: Int -> DynFlags -> DynFlags
setOptLevel n dflags
   | hscTarget dflags == HscInterpreted && n > 0
	= dflags
	    -- not in IO any more, oh well:
	    -- putStr "warning: -O conflicts with --interactive; -O ignored.\n"
   | otherwise
	= updOptLevel n dflags


setMainIs :: String -> DynP ()
setMainIs arg
1253
  | not (null main_fn)		-- The arg looked like "Foo.baz"
1254
  = upd $ \d -> d{ mainFunIs = Just main_fn,
Simon Marlow's avatar
Simon Marlow committed
1255
	  	   mainModIs = mkModule mainPackageId (mkModuleName main_mod) }
1256

1257
  | isUpper (head main_mod)	-- The arg looked like "Foo"
Simon Marlow's avatar
Simon Marlow committed
1258
  = upd $ \d -> d{ mainModIs = mkModule mainPackageId (mkModuleName main_mod) }
1259 1260
  
  | otherwise			-- The arg looked like "baz"
1261
  = upd $ \d -> d{ mainFunIs = Just main_mod }
1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305
  where
    (main_mod, main_fn) = splitLongestPrefix arg (== '.')

-----------------------------------------------------------------------------
-- Paths & Libraries

-- -i on its own deletes the import paths
addImportPath "" = upd (\s -> s{importPaths = []})
addImportPath p  = upd (\s -> s{importPaths = importPaths s ++ splitPathList p})


addLibraryPath p = 
  upd (\s -> s{libraryPaths = libraryPaths s ++ splitPathList p})

addIncludePath p = 
  upd (\s -> s{includePaths = includePaths s ++ splitPathList p})

addFrameworkPath p = 
  upd (\s -> s{frameworkPaths = frameworkPaths s ++ splitPathList p})

split_marker = ':'   -- not configurable (ToDo)

splitPathList :: String -> [String]
splitPathList s = filter notNull (splitUp s)
		-- empty paths are ignored: there might be a trailing
		-- ':' in the initial list, for example.  Empty paths can
		-- cause confusion when they are translated into -I options
		-- for passing to gcc.
  where
#ifndef mingw32_TARGET_OS
    splitUp xs = split split_marker xs
#else 
     -- Windows: 'hybrid' support for DOS-style paths in directory lists.
     -- 
     -- That is, if "foo:bar:baz" is used, this interpreted as
     -- consisting of three entries, 'foo', 'bar', 'baz'.
     -- However, with "c:/foo:c:\\foo;x:/bar", this is interpreted
     -- as 3 elts, "c:/foo", "c:\\foo", "x:/bar"
     --
     -- Notice that no attempt is made to fully replace the 'standard'
     -- split marker ':' with the Windows / DOS one, ';'. The reason being
     -- that this will cause too much breakage for users & ':' will
     -- work fine even with DOS paths, if you're not insisting on being silly.
     -- So, use either.
1306 1307 1308 1309 1310
    splitUp []             = []
    splitUp (x:':':div:xs) | div `elem` dir_markers
			   = ((x:':':div:p): splitUp rs)
			   where
			      (p,rs) = findNextPath xs
1311 1312 1313
	  -- we used to check for existence of the path here, but that
	  -- required the IO monad to be threaded through the command-line
   	  -- parser which is quite inconvenient.  The 
1314 1315 1316
    splitUp xs = cons p (splitUp rs)
	       where
		 (p,rs) = findNextPath xs
1317
    
1318 1319
		 cons "" xs = xs
		 cons x  xs = x:xs
1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335

    -- will be called either when we've consumed nought or the
    -- "<Drive>:/" part of a DOS path, so splitting is just a Q of
    -- finding the next split marker.
    findNextPath xs = 
        case break (`elem` split_markers) xs of
	   (p, d:ds) -> (p, ds)
	   (p, xs)   -> (p, xs)

    split_markers :: [Char]