DynFlags.hs 43.1 KB
Newer Older
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
-----------------------------------------------------------------------------
--
-- 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(..),
	HscTarget(..),
	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,
40
	setTmpDir,
41
42
43
	
	-- parsing DynFlags
	parseDynamicFlags,
44
        allFlags,
45
46
47
48
49
50
51

	-- misc stuff
	machdepCCOpts, picCCOpts,
  ) where

#include "HsVersions.h"

52
53
import Module		( Module, mkModule )
import PrelNames	( mAIN )
54
55
56
57
58
59
60
import StaticFlags	( opt_Static, opt_PIC, 
			  WayName(..), v_Ways, v_Build_tag, v_RTS_Build_tag )
import {-# SOURCE #-} Packages (PackageState)
import DriverPhases	( Phase(..), phaseInputExt )
import Config
import CmdLineParser
import Panic		( panic, GhcException(..) )
61
import Util		( notNull, splitLongestPrefix, split, normalisePath )
62
import SrcLoc           ( SrcSpan )
63
64
65
66

import DATA_IOREF	( readIORef )
import EXCEPTION	( throwDyn )
import Monad		( when )
67
#ifdef mingw32_TARGET_OS
68
import Data.List	( isPrefixOf )
69
#endif
70
71
import Maybe		( fromJust )
import Char		( isDigit, isUpper )
72
import Outputable
73
74
75
import System.IO        ( hPutStrLn, stderr )
import {-# SOURCE #-} ErrUtils ( Severity(..), Message, mkLocMessage )

76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
-- -----------------------------------------------------------------------------
-- 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
   | 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
   | 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
119
   | Opt_D_faststring_stats
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
   | Opt_DoCoreLinting
   | Opt_DoStgLinting
   | Opt_DoCmmLinting

   | Opt_WarnIsError		-- -Werror; makes warnings fatal
   | Opt_WarnDuplicateExports
   | Opt_WarnHiShadows
   | Opt_WarnIncompletePatterns
   | Opt_WarnIncompletePatternsRecUpd
   | Opt_WarnMissingFields
   | Opt_WarnMissingMethods
   | Opt_WarnMissingSigs
   | Opt_WarnNameShadowing
   | Opt_WarnOverlappingPatterns
   | Opt_WarnSimplePatterns
   | Opt_WarnTypeDefaults
   | Opt_WarnUnusedBinds
   | Opt_WarnUnusedImports
   | Opt_WarnUnusedMatches
   | Opt_WarnDeprecations
   | Opt_WarnDodgyImports
   | Opt_WarnOrphans

   -- language opts
   | Opt_AllowOverlappingInstances
   | Opt_AllowUndecidableInstances
   | Opt_AllowIncoherentInstances
   | Opt_MonomorphismRestriction
   | Opt_GlasgowExts
   | Opt_FFI
   | Opt_PArr			       -- syntactic support for parallel arrays
   | Opt_Arrows			       -- Arrow-notation syntax
   | Opt_TH
   | Opt_ImplicitParams
   | Opt_Generics
   | Opt_ImplicitPrelude 
   | Opt_ScopedTypeVariables
simonpj@microsoft.com's avatar
simonpj@microsoft.com committed
157
   | Opt_BangPatterns
158
159
160
161
162
163
164
165
166

   -- optimisation opts
   | Opt_Strictness
   | Opt_FullLaziness
   | Opt_CSE
   | Opt_IgnoreInterfacePragmas
   | Opt_OmitInterfacePragmas
   | Opt_DoLambdaEtaExpansion
   | Opt_IgnoreAsserts
167
   | Opt_IgnoreBreakpoints
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
   | Opt_DoEtaReduction
   | Opt_CaseMerge
   | Opt_UnboxStrictFields

   -- misc opts
   | Opt_Cpp
   | Opt_Pp
   | Opt_RecompChecking
   | Opt_DryRun
   | Opt_DoAsmMangling
   | Opt_ExcessPrecision
   | Opt_ReadUserPackageConf
   | Opt_NoHsMain
   | Opt_SplitObjs
   | Opt_StgStats
183
   | Opt_HideAllPackages
184
185
186
187
188
189
190
191
192

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

   deriving (Eq)
193
 
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
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,
  stolen_x86_regs	:: Int,		
  cmdlineHcIncludes	:: [String],	-- -#includes
  importPaths		:: [FilePath],
209
  mainModIs		:: Module,
210
211
212
213
214
215
216
217
  mainFunIs		:: Maybe String,

  -- 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.
218
219
220
221
  objectDir		:: Maybe String,
  hiDir			:: Maybe String,
  stubDir		:: Maybe String,

222
223
224
  objectSuf		:: String,
  hcSuf			:: String,
  hiSuf			:: String,
225
226
227
228

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

229
230
231
232
  includePaths		:: [String],
  libraryPaths		:: [String],
  frameworkPaths	:: [String],  	-- used on darwin only
  cmdlineFrameworks	:: [String],	-- ditto
233
  tmpDir		:: String,	-- no trailing '/'
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
  
  -- 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]),

257
  --  ** Package flags
258
259
260
261
262
263
264
  extraPkgConfs		:: [FilePath],
	-- 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

265
  --  ** Package state
266
267
268
  pkgState		:: PackageState,

  -- hsc dynamic flags
269
270
271
272
  flags      		:: [DynFlag],
  
  -- message output
  log_action            :: Severity -> SrcSpan -> PprStyle -> Message -> IO ()
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
 }

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

data GhcMode
  = BatchCompile	-- | @ghc --make Main@
  | Interactive		-- | @ghc --interactive@
  | OneShot		-- | @ghc -c Foo.hs@
  | JustTypecheck	-- | Development environemnts, refactorer, etc.
  | MkDepend
  deriving Eq

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

data GhcLink	-- What to do in the link step, if there is one
  =		-- Only relevant for modes
		-- 	DoMake and StopBefore StopLn
    NoLink		-- Don't link at all
  | StaticLink		-- Ordinary linker [the default]
  | MkDLL		-- Make a DLL

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

data PackageFlag
  = ExposePackage  String
  | HidePackage    String
  | IgnorePackage  String

defaultHscTarget
  | 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 {
	ghcMode			= OneShot,
	ghcLink			= StaticLink,
	coreToDo 		= Nothing,
	stgToDo			= Nothing, 
	hscTarget		= defaultHscTarget, 
	hscOutName		= "", 
	extCoreName		= "",
	verbosity		= 0, 
	optLevel		= 0,
	maxSimplIterations	= 4,
	ruleCheck		= Nothing,
	stolen_x86_regs		= 4,
	cmdlineHcIncludes	= [],
	importPaths		= ["."],
343
	mainModIs		= mAIN,
344
345
346
347
348
349
	mainFunIs		= Nothing,
	
	wayNames		= panic "ways",
	buildTag		= panic "buildTag",
	rtsBuildTag		= panic "rtsBuildTag",

350
351
352
353
	objectDir		= Nothing,
	hiDir			= Nothing,
	stubDir			= Nothing,

354
355
356
	objectSuf		= phaseInputExt StopLn,
	hcSuf			= phaseInputExt HCc,
	hiSuf			= "hi",
357
358
359

	outputFile		= Nothing,
	outputHi		= Nothing,
360
361
362
363
	includePaths		= [],
	libraryPaths		= [],
	frameworkPaths		= [],
	cmdlineFrameworks	= [],
364
	tmpDir			= cDEFAULT_TMPDIR,
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
	
	opt_L			= [],
	opt_P			= [],
	opt_F			= [],
	opt_c			= [],
	opt_a			= [],
	opt_m			= [],
	opt_l			= [],
	opt_dll			= [],
	opt_dep			= [],
	
	pgm_L			= panic "pgm_L",
	pgm_P			= panic "pgm_P",
	pgm_F			= panic "pgm_F",
	pgm_c			= panic "pgm_c",
	pgm_m			= panic "pgm_m",
	pgm_s			= panic "pgm_s",
	pgm_a			= panic "pgm_a",
	pgm_l			= panic "pgm_l",
	pgm_dll			= panic "pgm_mkdll",
	
	extraPkgConfs		= [],
	packageFlags		= [],
	pkgState		= panic "pkgState",
	
	flags = [ 
    	    Opt_RecompChecking,
    	    Opt_ReadUserPackageConf,
    
    	    Opt_ImplicitPrelude,
    	    Opt_MonomorphismRestriction,
    	    Opt_Strictness,
    			-- strictness is on by default, but this only
    			-- applies to -O.
    	    Opt_CSE,		-- similarly for CSE.
    	    Opt_FullLaziness,	-- ...and for full laziness
    
    	    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.
    
    	    Opt_DoAsmMangling,
    
    	    -- and the default no-optimisation options:
    	    Opt_IgnoreInterfacePragmas,
    	    Opt_OmitInterfacePragmas
    
414
415
416
417
418
419
420
               ] ++ standardWarnings,
               
        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))
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
      }

{- 
    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 =  ""

452
453
454
455
setObjectDir  f d = d{ objectDir  = f}
setHiDir      f d = d{ hiDir      = f}
setStubDir    f d = d{ stubDir    = f}

456
457
setObjectSuf  f d = d{ objectSuf  = f}
setHiSuf      f d = d{ hiSuf      = f}
458
459
460
461
setHcSuf      f d = d{ hcSuf      = f}

setOutputFile f d = d{ outputFile = f}
setOutputHi   f d = d{ outputHi   = f}
462
463
464
465
466
467
468
469
470
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
502
503
504
505
506
507
508
509
510
511
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
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
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
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
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
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768

-- 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
  = if (n >= 1)
     then dfs2{ hscTarget = HscC, optLevel = n } -- turn on -fvia-C with -O
     else dfs2{ optLevel = n }
  where
   dfs1 = foldr (flip dopt_unset) dfs  remove_dopts
   dfs2 = foldr (flip dopt_set)   dfs1 extra_dopts

   extra_dopts
	| n == 0    = opt_0_dopts
	| otherwise = opt_1_dopts

   remove_dopts
	| n == 0    = opt_1_dopts
	| otherwise = opt_0_dopts
	
opt_0_dopts =  [ 
	Opt_IgnoreInterfacePragmas,
	Opt_OmitInterfacePragmas
    ]

opt_1_dopts = [
	Opt_IgnoreAsserts,
	Opt_DoEtaReduction,
	Opt_CaseMerge
     ]

-- -----------------------------------------------------------------------------
-- 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

  | CoreDoNothing 	 -- useful when building up lists of these things

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:

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
    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.

            NoCaseOfCase,
			-- Don't do case-of-case transformations.
			-- This makes full laziness work better
	    MaxSimplifierIterations max_iter
	],

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

	if full_laziness then CoreDoFloatOutwards (FloatOutSw False False)
			 else CoreDoNothing,

	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
	CoreDoOldStrictness
#endif
	if strictness then CoreDoStrictness else CoreDoNothing,
	CoreDoWorkerWrapper,
	CoreDoGlomBinds,

	CoreDoSimplify (SimplPhase 0) [
	   MaxSimplifierIterations max_iter
	],

	if full_laziness then
	  CoreDoFloatOutwards (FloatOutSw False	  -- Not lambdas
					  True)   -- Float constants
	else CoreDoNothing,
		-- 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)


	-- 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

	if cse then CoreCSE else CoreDoNothing,

	CoreDoFloatInwards,

-- Case-liberation for -O2.  This should be after
-- strictness analysis and the simplification which follows it.

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

	if opt_level >= 2 then
	   CoreLiberateCase
	else
	   CoreDoNothing,
	if opt_level >= 2 then
	   CoreDoSpecConstr
	else
	   CoreDoNothing,

	-- Final clean-up simplification:
	CoreDoSimplify (SimplPhase 0) [
	  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

769
770
771
772
773
774
775
776
777
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

778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
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) )
  ,  ( "v"		, OptPrefix (setVerbosity) )

        ------- 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) )  
800
  ,  ( "optc"		, HasArg (upd . addOptc) )  
801
802
803
804
805
806
  ,  ( "optm"		, HasArg (upd . addOptm) )  
  ,  ( "opta"		, HasArg (upd . addOpta) )  
  ,  ( "optl"		, HasArg (upd . addOptl) )  
  ,  ( "optdll"		, HasArg (upd . addOptdll) )  
  ,  ( "optdep"		, HasArg (upd . addOptdep) )

807
808
809
810
  ,  ( "split-objs"	, NoArg (if can_split
				    then setDynFlag Opt_SplitObjs
				    else return ()) )

811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
	-------- 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 ------------------------------------------
827
  ,  ( "odir"		, HasArg (upd . setObjectDir  . Just))
828
829
830
831
832
833
834
  ,  ( "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))
835
  ,  ( "stubdir"	, HasArg (upd . setStubDir . Just))
836
837

	------- Keeping temporary files -------------------------------------
838
839
  ,  ( "keep-hc-file"   , AnySuffix (\_ -> setDynFlag Opt_KeepHcFiles))
  ,  ( "keep-s-file"    , AnySuffix (\_ -> setDynFlag Opt_KeepSFiles))
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
  ,  ( "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 )

	------- recompilation checker --------------------------------------
  ,  ( "recomp"		, NoArg (setDynFlag   Opt_RecompChecking) )
  ,  ( "no-recomp"  	, NoArg (unSetDynFlag Opt_RecompChecking) )

        ------- Packages ----------------------------------------------------
  ,  ( "package-conf"   , HasArg extraPkgConf_ )
  ,  ( "no-user-package-conf", NoArg (unSetDynFlag Opt_ReadUserPackageConf) )
  ,  ( "package-name"   , HasArg ignorePackage ) -- for compatibility
  ,  ( "package"        , HasArg exposePackage )
  ,  ( "hide-package"   , HasArg hidePackage )
857
  ,  ( "hide-all-packages", NoArg (setDynFlag Opt_HideAllPackages) )
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
  ,  ( "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)
  ,  ( "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)
  ,  ( "ddump-rn-trace",         NoArg (setDynFlag Opt_D_dump_rn_trace))
  ,  ( "ddump-if-trace",         NoArg (setDynFlag Opt_D_dump_if_trace))
  ,  ( "ddump-tc-trace",         setDumpFlag Opt_D_dump_tc_trace)
  ,  ( "ddump-splices",          setDumpFlag Opt_D_dump_splices)
  ,  ( "ddump-rn-stats",         NoArg (setDynFlag Opt_D_dump_rn_stats))
  ,  ( "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)
905
  ,  ( "ddump-hi-diffs",         NoArg (setDynFlag Opt_D_dump_hi_diffs))
906
  ,  ( "ddump-hi",               setDumpFlag Opt_D_dump_hi)
907
  ,  ( "ddump-minimal-imports",  NoArg (setDynFlag Opt_D_dump_minimal_imports))
908
909
910
911
912
913
  ,  ( "ddump-vect",         	 setDumpFlag Opt_D_dump_vect)
  ,  ( "dcore-lint",       	 NoArg (setDynFlag Opt_DoCoreLinting))
  ,  ( "dstg-lint",        	 NoArg (setDynFlag Opt_DoStgLinting))
  ,  ( "dcmm-lint",		 NoArg (setDynFlag Opt_DoCmmLinting))
  ,  ( "dshow-passes",           NoArg (do unSetDynFlag Opt_RecompChecking
				           setVerbosity "2") )
914
  ,  ( "dfaststring-stats",	 NoArg (setDynFlag Opt_D_faststring_stats))
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944

	------ 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 ------------------------------------------
  ,  ( "O"		   , NoArg (upd (setOptLevel 1)))
  ,  ( "Onot"		   , NoArg (upd (setOptLevel 0)))
  ,  ( "O"		   , PrefixPred (all isDigit) 
				(\f -> upd (setOptLevel (read f))))

  ,  ( "fmax-simplifier-iterations", 
		PrefixPred (all isDigit) 
		  (\n -> upd (\dfs -> 
			dfs{ maxSimplIterations = read n })) )

  ,  ( "frule-check", 
		SepArg (\s -> upd (\dfs -> dfs{ ruleCheck = Just s })))

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

945
  ,  ( "fno-code",	NoArg (setTarget HscNothing))
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
  ,  ( "fasm",		AnySuffix (\_ -> setTarget HscAsm) )
  ,  ( "fvia-c",	NoArg (setTarget HscC) )
  ,  ( "fvia-C",	NoArg (setTarget HscC) )
  ,  ( "filx",		NoArg (setTarget HscILX) )

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

	-- the rest of the -f* and -fno-* flags
  ,  ( "fno-", 		PrefixPred (\f -> isFFlag f) (\f -> unSetDynFlag (getFFlag f)) )
  ,  ( "f",		PrefixPred (\f -> isFFlag f) (\f -> setDynFlag (getFFlag f)) )
 ]

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

fFlags = [
  ( "warn-duplicate-exports",    	Opt_WarnDuplicateExports ),
  ( "warn-hi-shadowing",         	Opt_WarnHiShadows ),
  ( "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 ),
  ( "warn-unused-binds",         	Opt_WarnUnusedBinds ),
  ( "warn-unused-imports",       	Opt_WarnUnusedImports ),
  ( "warn-unused-matches",       	Opt_WarnUnusedMatches ),
  ( "warn-deprecations",         	Opt_WarnDeprecations ),
  ( "warn-orphans",	         	Opt_WarnOrphans ),
  ( "fi",				Opt_FFI ),  -- support `-ffi'...
  ( "ffi",				Opt_FFI ),  -- ...and also `-fffi'
  ( "arrows",				Opt_Arrows ), -- arrow syntax
  ( "parr",				Opt_PArr ),
  ( "th",				Opt_TH ),
  ( "implicit-prelude",  		Opt_ImplicitPrelude ),
  ( "scoped-type-variables",  		Opt_ScopedTypeVariables ),
simonpj@microsoft.com's avatar
simonpj@microsoft.com committed
985
  ( "bang-patterns",	  		Opt_BangPatterns ),
986
987
988
989
990
991
992
993
994
995
996
997
998
  ( "monomorphism-restriction",		Opt_MonomorphismRestriction ),
  ( "implicit-params",			Opt_ImplicitParams ),
  ( "allow-overlapping-instances", 	Opt_AllowOverlappingInstances ),
  ( "allow-undecidable-instances", 	Opt_AllowUndecidableInstances ),
  ( "allow-incoherent-instances", 	Opt_AllowIncoherentInstances ),
  ( "generics",  			Opt_Generics ),
  ( "strictness",			Opt_Strictness ),
  ( "full-laziness",			Opt_FullLaziness ),
  ( "cse",				Opt_CSE ),
  ( "ignore-interface-pragmas",		Opt_IgnoreInterfacePragmas ),
  ( "omit-interface-pragmas",		Opt_OmitInterfacePragmas ),
  ( "do-lambda-eta-expansion",		Opt_DoLambdaEtaExpansion ),
  ( "ignore-asserts",			Opt_IgnoreAsserts ),
999
  ( "ignore-breakpoints",               Opt_IgnoreBreakpoints),
1000
1001
1002
1003
  ( "do-eta-reduction",			Opt_DoEtaReduction ),
  ( "case-merge",			Opt_CaseMerge ),
  ( "unbox-strict-fields",		Opt_UnboxStrictFields ),
  ( "excess-precision",			Opt_ExcessPrecision ),
1004
  ( "asm-mangling",			Opt_DoAsmMangling )
1005
1006
1007
1008
1009
1010
  ]

glasgowExtsFlags = [ 
  Opt_GlasgowExts, 
  Opt_FFI, 
  Opt_ImplicitParams, 
simonpj@microsoft.com's avatar
simonpj@microsoft.com committed
1011
1012
  Opt_ScopedTypeVariables,
  Opt_BangPatterns ]
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081

isFFlag f = f `elem` (map fst fFlags)
getFFlag f = fromJust (lookup f fFlags)

-- -----------------------------------------------------------------------------
-- 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)

setDynFlag, unSetDynFlag :: DynFlag -> DynP ()
setDynFlag f   = upd (\dfs -> dopt_set dfs f)
unSetDynFlag f = upd (\dfs -> dopt_unset dfs f)

setDumpFlag :: DynFlag -> OptKind DynP
setDumpFlag dump_flag 
  = NoArg (unSetDynFlag Opt_RecompChecking >> setDynFlag dump_flag)
	-- Whenver we -ddump, switch off the recompilation checker,
	-- else you don't see the dump!

setVerbosity "" = upd (\dfs -> dfs{ verbosity = 3 })
setVerbosity n 
  | all isDigit n = upd (\dfs -> dfs{ verbosity = read n })
  | otherwise     = throwDyn (UsageError "can't parse verbosity flag (-v<n>)")

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 })

-- we can only switch between HscC, HscAsmm, and HscILX with dynamic flags 
-- (-fvia-C, -fasm, -filx respectively).
setTarget l = upd (\dfs -> case hscTarget dfs of
					HscC   -> dfs{ hscTarget = l }
					HscAsm -> dfs{ hscTarget = l }
					HscILX -> dfs{ hscTarget = l }
					_      -> dfs)

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
1082
  | not (null main_fn)		-- The arg looked like "Foo.baz"
1083
  = upd $ \d -> d{ mainFunIs = Just main_fn,
1084
	  	   mainModIs = mkModule main_mod }
1085

1086
  | isUpper (head main_mod)	-- The arg looked like "Foo"
1087
  = upd $ \d -> d{ mainModIs = mkModule main_mod }
1088
1089
  
  | otherwise			-- The arg looked like "baz"
1090
  = upd $ \d -> d{ mainFunIs = Just main_mod }
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
1129
1130
1131
1132
1133
1134
  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.
1135
1136
1137
1138
1139
    splitUp []             = []
    splitUp (x:':':div:xs) | div `elem` dir_markers
			   = ((x:':':div:p): splitUp rs)
			   where
			      (p,rs) = findNextPath xs
1140
1141
1142
	  -- 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 
1143
1144
1145
    splitUp xs = cons p (splitUp rs)
	       where
		 (p,rs) = findNextPath xs
1146
    
1147
1148
		 cons "" xs = xs
		 cons x  xs = x:xs
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164

    -- 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

1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
-- -----------------------------------------------------------------------------
-- 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
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263

-----------------------------------------------------------------------------
-- 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",
#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
1264
	= ( [], ["-fomit-frame-pointer",
1265
		 "-fno-asynchronous-unwind-tables",
1266
1267
1268
1269
			-- 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.
1270
#ifdef HAVE_GCC_HAS_NO_UNIT_AT_A_TIME
1271
		 "-fno-unit-at-a-time",
1272
1273
1274
1275
			-- 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.
1276
#endif
1277
1278
1279
1280
		 "-fno-builtin"
			-- calling builtins like strlen() using the FFI can
			-- cause gcc to run out of regs, so use the external
			-- version.
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
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325

#elif mips_TARGET_ARCH
	= ( ["-static"], [] )

#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
1326
1327
1328
1329
1330
1331
1332

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

can_split :: Bool
can_split =  
#if    defined(i386_TARGET_ARCH)     \
1333
    || defined(x86_64_TARGET_ARCH)   \
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
    || 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