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]
    split_markers = [':', ';']

    dir_markers :: [Char]
    dir_markers = ['/', '\\']
#endif

1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
-- -----------------------------------------------------------------------------
-- tmpDir, where we store temporary files.

setTmpDir :: FilePath -> DynFlags -> DynFlags
setTmpDir dir dflags = dflags{ tmpDir = canonicalise dir }
  where
#if !defined(mingw32_HOST_OS)
     canonicalise p = normalisePath p
#else
	-- Canonicalisation of temp path under win32 is a bit more
	-- involved: (a) strip trailing slash, 
	-- 	     (b) normalise slashes
	--	     (c) just in case, if there is a prefix /cygdrive/x/, change to x:
	-- 
     canonicalise path = normalisePath (xltCygdrive (removeTrailingSlash path))

        -- if we're operating under cygwin, and TMP/TEMP is of
	-- the form "/cygdrive/drive/path", translate this to
	-- "drive:/path" (as GHC isn't a cygwin app and doesn't
	-- understand /cygdrive paths.)
     xltCygdrive path
      | "/cygdrive/" `isPrefixOf` path = 
	  case drop (length "/cygdrive/") path of
	    drive:xs@('/':_) -> drive:':':xs
	    _ -> path
      | otherwise = path

        -- strip the trailing backslash (awful, but we only do this once).
     removeTrailingSlash path = 
       case last path of
         '/'  -> init path
         '\\' -> init path
         _    -> path
#endif
1370
1371

-----------------------------------------------------------------------------
andy@galois.com's avatar
andy@galois.com committed
1372
1373
1374
1375
1376
1377
-- Hpc stuff

setOptHpcDir :: String -> DynP ()
setOptHpcDir arg  = upd $ \ d -> d{hpcDir = arg}

-----------------------------------------------------------------------------
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
-- Via-C compilation stuff

machdepCCOpts :: DynFlags -> ([String], -- flags for all C compilations
			      [String]) -- for registerised HC compilations
machdepCCOpts dflags
#if alpha_TARGET_ARCH
	=       ( ["-w", "-mieee"
#ifdef HAVE_THREADED_RTS_SUPPORT
		    , "-D_REENTRANT"
#endif
		   ], [] )
	-- For now, to suppress the gcc warning "call-clobbered
	-- register used for global register variable", we simply
	-- disable all warnings altogether using the -w flag. Oh well.

#elif hppa_TARGET_ARCH
        -- ___HPUX_SOURCE, not _HPUX_SOURCE, is #defined if -ansi!
        -- (very nice, but too bad the HP /usr/include files don't agree.)
	= ( ["-D_HPUX_SOURCE"], [] )

#elif m68k_TARGET_ARCH
      -- -fno-defer-pop : for the .hc files, we want all the pushing/
      --    popping of args to routines to be explicit; if we let things
      --    be deferred 'til after an STGJUMP, imminent death is certain!
      --
      -- -fomit-frame-pointer : *don't*
      --     It's better to have a6 completely tied up being a frame pointer
      --     rather than let GCC pick random things to do with it.
      --     (If we want to steal a6, then we would try to do things
      --     as on iX86, where we *do* steal the frame pointer [%ebp].)
	= ( [], ["-fno-defer-pop", "-fno-omit-frame-pointer"] )

#elif i386_TARGET_ARCH
      -- -fno-defer-pop : basically the same game as for m68k
      --
      -- -fomit-frame-pointer : *must* in .hc files; because we're stealing
      --   the fp (%ebp) for our register maps.
	=  let n_regs = stolen_x86_regs dflags
	       sta = opt_Static
	   in
	            ( [ if sta then "-DDONT_WANT_WIN32_DLL_SUPPORT" else ""
--                    , if suffixMatch "mingw32" cTARGETPLATFORM then "-mno-cygwin" else "" 
		      ],
		      [ "-fno-defer-pop",
#ifdef HAVE_GCC_MNO_OMIT_LFPTR
			-- Some gccs are configured with
			-- -momit-leaf-frame-pointer on by default, and it
			-- apparently takes precedence over 
			-- -fomit-frame-pointer, so we disable it first here.
			"-mno-omit-leaf-frame-pointer",
1428
1429
1430
1431
1432
1433
1434
#endif
#ifdef HAVE_GCC_HAS_NO_UNIT_AT_A_TIME
		 	"-fno-unit-at-a-time",
			-- unit-at-a-time doesn't do us any good, and screws
			-- up -split-objs by moving the split markers around.
			-- It's only turned on with -O2, but put it here just
			-- in case someone uses -optc-O2.
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
#endif
			"-fomit-frame-pointer",
			-- we want -fno-builtin, because when gcc inlines
			-- built-in functions like memcpy() it tends to
			-- run out of registers, requiring -monly-n-regs
			"-fno-builtin",
	                "-DSTOLEN_X86_REGS="++show n_regs ]
		    )

#elif ia64_TARGET_ARCH
	= ( [], ["-fomit-frame-pointer", "-G0"] )

#elif x86_64_TARGET_ARCH
1448
	= ( [], ["-fomit-frame-pointer",
1449
		 "-fno-asynchronous-unwind-tables",
1450
1451
1452
1453
			-- the unwind tables are unnecessary for HC code,
			-- and get in the way of -split-objs.  Another option
			-- would be to throw them away in the mangler, but this
			-- is easier.
1454
#ifdef HAVE_GCC_HAS_NO_UNIT_AT_A_TIME
1455
		 "-fno-unit-at-a-time",
1456
1457
1458
1459
			-- unit-at-a-time doesn't do us any good, and screws
			-- up -split-objs by moving the split markers around.
			-- It's only turned on with -O2, but put it here just
			-- in case someone uses -optc-O2.
1460
#endif
1461
1462
1463
1464
		 "-fno-builtin"
			-- calling builtins like strlen() using the FFI can
			-- cause gcc to run out of regs, so use the external
			-- version.
1465
		] )
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506

#elif sparc_TARGET_ARCH
	= ( [], ["-w"] )
	-- For now, to suppress the gcc warning "call-clobbered
	-- register used for global register variable", we simply
	-- disable all warnings altogether using the -w flag. Oh well.

#elif powerpc_apple_darwin_TARGET
      -- -no-cpp-precomp:
      --     Disable Apple's precompiling preprocessor. It's a great thing
      --     for "normal" programs, but it doesn't support register variable
      --     declarations.
        = ( [], ["-no-cpp-precomp"] )
#else
	= ( [], [] )
#endif

picCCOpts :: DynFlags -> [String]
picCCOpts dflags
#if darwin_TARGET_OS
      -- Apple prefers to do things the other way round.
      -- PIC is on by default.
      -- -mdynamic-no-pic:
      --     Turn off PIC code generation.
      -- -fno-common:
      --     Don't generate "common" symbols - these are unwanted
      --     in dynamic libraries.

    | opt_PIC
        = ["-fno-common"]
    | otherwise
        = ["-mdynamic-no-pic"]
#elif mingw32_TARGET_OS
      -- no -fPIC for Windows
        = []
#else
    | opt_PIC
        = ["-fPIC"]
    | otherwise
        = []
#endif
1507
1508
1509
1510
1511
1512
1513

-- -----------------------------------------------------------------------------
-- Splitting

can_split :: Bool
can_split =  
#if    defined(i386_TARGET_ARCH)     \
1514
    || defined(x86_64_TARGET_ARCH)   \
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
    || defined(alpha_TARGET_ARCH)    \
    || defined(hppa_TARGET_ARCH)     \
    || defined(m68k_TARGET_ARCH)     \
    || defined(mips_TARGET_ARCH)     \
    || defined(powerpc_TARGET_ARCH)  \
    || defined(rs6000_TARGET_ARCH)   \
    || defined(sparc_TARGET_ARCH) 
   True
#else
   False
#endif