DynFlags.hs 52.1 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
-- -----------------------------------------------------------------------------
-- DynFlags

data DynFlag

   -- debugging flags
   = Opt_D_dump_cmm
95
   | Opt_D_dump_cps_cmm
96
97
98
99
100
101
102
   | 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
103
   | Opt_D_dump_rule_firings
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
   | 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
127
   | Opt_D_dump_hpc
128
129
130
131
132
133
   | 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
134
   | Opt_D_dump_mod_cycles
135
   | Opt_D_faststring_stats
136
137
138
139
140
141
142
   | Opt_DoCoreLinting
   | Opt_DoStgLinting
   | Opt_DoCmmLinting

   | Opt_WarnIsError		-- -Werror; makes warnings fatal
   | Opt_WarnDuplicateExports
   | Opt_WarnHiShadows
143
   | Opt_WarnImplicitPrelude
144
145
146
147
148
149
150
151
152
   | Opt_WarnIncompletePatterns
   | Opt_WarnIncompletePatternsRecUpd
   | Opt_WarnMissingFields
   | Opt_WarnMissingMethods
   | Opt_WarnMissingSigs
   | Opt_WarnNameShadowing
   | Opt_WarnOverlappingPatterns
   | Opt_WarnSimplePatterns
   | Opt_WarnTypeDefaults
153
   | Opt_WarnMonomorphism
154
155
156
157
158
159
   | Opt_WarnUnusedBinds
   | Opt_WarnUnusedImports
   | Opt_WarnUnusedMatches
   | Opt_WarnDeprecations
   | Opt_WarnDodgyImports
   | Opt_WarnOrphans
160
   | Opt_WarnTabs
161
162
163
164
165
166

   -- language opts
   | Opt_AllowOverlappingInstances
   | Opt_AllowUndecidableInstances
   | Opt_AllowIncoherentInstances
   | Opt_MonomorphismRestriction
167
   | Opt_MonoPatBinds
168
   | Opt_ExtendedDefaultRules		-- Use GHC's extended rules for defaulting
169
170
   | Opt_GlasgowExts
   | Opt_FFI
171
172
   | Opt_PArr				-- Syntactic support for parallel arrays
   | Opt_Arrows				-- Arrow-notation syntax
173
174
175
176
177
   | Opt_TH
   | Opt_ImplicitParams
   | Opt_Generics
   | Opt_ImplicitPrelude 
   | Opt_ScopedTypeVariables
simonpj@microsoft.com's avatar
simonpj@microsoft.com committed
178
   | Opt_BangPatterns
179
   | Opt_TypeFamilies
180
   | Opt_OverloadedStrings
181
   | Opt_DisambiguateRecordFields
182
   | Opt_RecordWildCards
183
   | Opt_RecordPuns
184
185
   | Opt_GADTs
   | Opt_RelaxedPolyRec			-- -X=RelaxedPolyRec
Ian Lynagh's avatar
Ian Lynagh committed
186
   | Opt_MultiParamTypeClasses
187
   | Opt_FunctionalDependencies
188
   | Opt_MagicHash
Ian Lynagh's avatar
Ian Lynagh committed
189
   | Opt_EmptyDataDecls
Ian Lynagh's avatar
Ian Lynagh committed
190
   | Opt_KindSignatures
Ian Lynagh's avatar
Ian Lynagh committed
191
   | Opt_ParallelListComp
192
   | Opt_GeneralizedNewtypeDeriving
Ian Lynagh's avatar
Ian Lynagh committed
193
   | Opt_RecursiveDo
194
195
196
197
198

   -- optimisation opts
   | Opt_Strictness
   | Opt_FullLaziness
   | Opt_CSE
199
200
   | Opt_LiberateCase
   | Opt_SpecConstr
201
202
203
204
   | Opt_IgnoreInterfacePragmas
   | Opt_OmitInterfacePragmas
   | Opt_DoLambdaEtaExpansion
   | Opt_IgnoreAsserts
205
   | Opt_IgnoreBreakpoints
206
207
208
   | Opt_DoEtaReduction
   | Opt_CaseMerge
   | Opt_UnboxStrictFields
209
   | Opt_DictsCheap
210
   | Opt_RewriteRules
rl@cse.unsw.edu.au's avatar
rl@cse.unsw.edu.au committed
211
   | Opt_Vectorise
212
213
214
215

   -- misc opts
   | Opt_Cpp
   | Opt_Pp
216
   | Opt_ForceRecomp
217
218
219
220
221
222
223
   | Opt_DryRun
   | Opt_DoAsmMangling
   | Opt_ExcessPrecision
   | Opt_ReadUserPackageConf
   | Opt_NoHsMain
   | Opt_SplitObjs
   | Opt_StgStats
224
   | Opt_HideAllPackages
225
   | Opt_PrintBindResult
226
   | Opt_Haddock
227
   | Opt_Hpc_No_Auto
228
   | Opt_BreakOnException
229
230
231
232
233
234
235
236
237

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

   deriving (Eq)
238
 
239
240
241
242
243
244
245
246
247
248
249
250
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,
251
252

  specThreshold		:: Int,		-- Threshold for function specialisation
253

254
255
256
  stolen_x86_regs	:: Int,		
  cmdlineHcIncludes	:: [String],	-- -#includes
  importPaths		:: [FilePath],
257
  mainModIs		:: Module,
258
  mainFunIs		:: Maybe String,
259
260
  ctxtStkDepth	        :: Int,		-- Typechecker context stack depth

Simon Marlow's avatar
Simon Marlow committed
261
  thisPackage		:: PackageId,
262
263
264
265
266
267
268

  -- 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.
269
270
271
272
  objectDir		:: Maybe String,
  hiDir			:: Maybe String,
  stubDir		:: Maybe String,

273
274
275
  objectSuf		:: String,
  hcSuf			:: String,
  hiSuf			:: String,
276
277
278
279

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

280
281
282
283
  includePaths		:: [String],
  libraryPaths		:: [String],
  frameworkPaths	:: [String],  	-- used on darwin only
  cmdlineFrameworks	:: [String],	-- ditto
284
  tmpDir		:: String,	-- no trailing '/'
285
  
286
287
288
  ghcUsagePath          :: FilePath,    -- Filled in by SysTools
  ghciUsagePath         :: FilePath,    -- ditto

andy@galois.com's avatar
andy@galois.com committed
289
290
  hpcDir		:: String,	-- ^ path to store the .mix files

291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
  -- 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]),
312
313
  pgm_T                 :: String,
  pgm_sysman            :: String,
314

315
  --  Package flags
316
  extraPkgConfs		:: [FilePath],
317
318
  topDir                :: FilePath,    -- filled in by SysTools
  systemPackageConfig   :: FilePath,    -- ditto
319
320
321
322
323
324
	-- 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

325
326
327
328
  -- Package state
  -- NB. do not modify this field, it is calculated by 
  -- Packages.initPackages and Packages.updatePackages.
  pkgDatabase           :: Maybe (UniqFM InstalledPackageInfo),
329
330
331
  pkgState		:: PackageState,

  -- hsc dynamic flags
332
333
334
335
  flags      		:: [DynFlag],
  
  -- message output
  log_action            :: Severity -> SrcSpan -> PprStyle -> Message -> IO ()
336
337
338
339
340
341
342
343
344
345
 }

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

346
347
348
349
350
351
352
353
354
355
356
357
-- | 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.
358
data GhcMode
359
360
361
  = CompManager         -- ^ --make, GHCi, etc.
  | OneShot		-- ^ ghc -c Foo.hs
  | MkDepend            -- ^ ghc -M, see Finder for why we need this
362
363
364
365
366
367
  deriving Eq

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

368
-- | What kind of linking to do.
369
data GhcLink	-- What to do in the link step, if there is one
370
371
372
  = NoLink		-- Don't link at all
  | LinkBinary		-- Link object code into a binary
  | LinkInMemory        -- Use the in-memory dynamic linker
373
  | LinkDynLib		-- Link objects into a dynamic lib (DLL on Windows, DSO on ELF platforms)
374
  deriving Eq
375
376
377
378
379
380
381
382
383

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

data PackageFlag
  = ExposePackage  String
  | HidePackage    String
  | IgnorePackage  String
384
  deriving Eq
385

386
387
388
389
390
defaultHscTarget = defaultObjectTarget

-- | the 'HscTarget' value corresponding to the default way to create
-- object files on the current platform.
defaultObjectTarget
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
  | 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 {
407
408
	ghcMode			= CompManager,
	ghcLink			= LinkBinary,
409
410
411
412
413
414
415
416
417
	coreToDo 		= Nothing,
	stgToDo			= Nothing, 
	hscTarget		= defaultHscTarget, 
	hscOutName		= "", 
	extCoreName		= "",
	verbosity		= 0, 
	optLevel		= 0,
	maxSimplIterations	= 4,
	ruleCheck		= Nothing,
418
	specThreshold		= 200,
419
420
421
	stolen_x86_regs		= 4,
	cmdlineHcIncludes	= [],
	importPaths		= ["."],
422
	mainModIs		= mAIN,
423
	mainFunIs		= Nothing,
424
425
	ctxtStkDepth		= mAX_CONTEXT_REDUCTION_DEPTH,

Simon Marlow's avatar
Simon Marlow committed
426
	thisPackage		= mainPackageId,
427

428
429
430
431
	objectDir		= Nothing,
	hiDir			= Nothing,
	stubDir			= Nothing,

432
433
434
	objectSuf		= phaseInputExt StopLn,
	hcSuf			= phaseInputExt HCc,
	hiSuf			= "hi",
435
436
437

	outputFile		= Nothing,
	outputHi		= Nothing,
438
439
440
441
	includePaths		= [],
	libraryPaths		= [],
	frameworkPaths		= [],
	cmdlineFrameworks	= [],
442
	tmpDir			= cDEFAULT_TMPDIR,
443
	
andy@galois.com's avatar
andy@galois.com committed
444
445
        hpcDir		        = ".hpc",

446
447
448
449
450
451
452
453
454
455
456
457
	opt_L			= [],
	opt_P			= [],
	opt_F			= [],
	opt_c			= [],
	opt_a			= [],
	opt_m			= [],
	opt_l			= [],
	opt_dll			= [],
	opt_dep			= [],
	
	extraPkgConfs		= [],
	packageFlags		= [],
458
459
        pkgDatabase             = Nothing,
        pkgState                = panic "no package state yet: call GHC.setSessionDynFlags",
460
461
462
	flags = [ 
    	    Opt_ReadUserPackageConf,
    
463
464
465
466
	    Opt_MonoPatBinds, 	-- Experimentally, I'm making this non-standard
				-- behaviour the default, to see if anyone notices
				-- SLPJ July 06

467
468
    	    Opt_ImplicitPrelude,
    	    Opt_MonomorphismRestriction,
469

470
471
    	    Opt_DoAsmMangling,
    
472
	    -- on by default:
473
474
475
476
	    Opt_PrintBindResult ]
	    ++ [f | (ns,f) <- optLevelFlags, 0 `elem` ns]
	    	    -- The default -O0 options
	    ++ standardWarnings,
477
478
479
480
481
482
               
        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))
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
      }

{- 
    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 =  ""

514
515
516
517
setObjectDir  f d = d{ objectDir  = f}
setHiDir      f d = d{ hiDir      = f}
setStubDir    f d = d{ stubDir    = f}

518
519
setObjectSuf  f d = d{ objectSuf  = f}
setHiSuf      f d = d{ hiSuf      = f}
520
521
522
523
setHcSuf      f d = d{ hcSuf      = f}

setOutputFile f d = d{ outputFile = f}
setOutputHi   f d = d{ outputHi   = f}
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

-- 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
573
  = dfs2{ optLevel = final_n }
574
  where
575
   final_n = max 0 (min 2 n)	-- Clamp to 0 <= n <= 2
576
577
578
   dfs1 = foldr (flip dopt_unset) dfs  remove_dopts
   dfs2 = foldr (flip dopt_set)   dfs1 extra_dopts

579
580
   extra_dopts  = [ f | (ns,f) <- optLevelFlags, final_n `elem` ns ]
   remove_dopts = [ f | (ns,f) <- optLevelFlags, final_n `notElem` ns ]
581
	
582
583
584
585
optLevelFlags :: [([Int], DynFlag)]
optLevelFlags
  = [ ([0],	Opt_IgnoreInterfacePragmas)
    , ([0],     Opt_OmitInterfacePragmas)
586

587
    , ([1,2],	Opt_IgnoreAsserts)
588
589
    , ([1,2],	Opt_RewriteRules)	-- Off for -O0; see Note [Scoping for Builtin rules]
					-- 		in PrelRules
590
591
592
593
594
    , ([1,2],	Opt_DoEtaReduction)
    , ([1,2],	Opt_CaseMerge)
    , ([1,2],	Opt_Strictness)
    , ([1,2],	Opt_CSE)
    , ([1,2],	Opt_FullLaziness)
595

596
597
598
599
600
601
602
603
    , ([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.
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
    ]

-- -----------------------------------------------------------------------------
-- 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
661
662
  | CoreDoNothing 		 -- Useful when building up 
  | CoreDoPasses [CoreToDo] 	 -- lists of these things
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678

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:
679
680
681
runWhen :: Bool -> CoreToDo -> CoreToDo
runWhen True  do_this = do_this
runWhen False do_this = CoreDoNothing
682
683
684
685
686
687
688
689
690
691
692

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
693
694
    spec_constr   = dopt Opt_SpecConstr dflags
    liberate_case = dopt Opt_LiberateCase dflags
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
    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
718
719
            NoCaseOfCase,	-- Don't do case-of-case transformations.
				-- This makes full laziness work better
720
721
722
723
724
725
726
	    MaxSimplifierIterations max_iter
	],

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

727
	runWhen full_laziness (CoreDoFloatOutwards (FloatOutSw False False)),
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

	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
766
	CoreDoOldStrictness,
767
#endif
768
769
770
771
772
773
774
775
776
777
778
	runWhen strictness (CoreDoPasses [
		CoreDoStrictness,
		CoreDoWorkerWrapper,
		CoreDoGlomBinds,
		CoreDoSimplify (SimplPhase 0) [
		   MaxSimplifierIterations max_iter
		]]),

	runWhen full_laziness 
	  (CoreDoFloatOutwards (FloatOutSw False    -- Not lambdas
					   True)),  -- Float constants
779
780
781
782
783
784
785
		-- 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)


786
787
788
789
	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
790
791
792

	CoreDoFloatInwards,

793
	case rule_check of { Just pat -> CoreDoRuleCheck 0 pat; Nothing -> CoreDoNothing },
794

795
796
797
798
799
		-- Case-liberation for -O2.  This should be after
		-- strictness analysis and the simplification which follows it.
	runWhen liberate_case (CoreDoPasses [
	    CoreLiberateCase,
	    CoreDoSimplify (SimplPhase 0) [
800
		  MaxSimplifierIterations max_iter
801
	    ] ]),	-- Run the simplifier after LiberateCase to vastly 
802
803
804
			-- reduce the possiblility of shadowing
			-- Reason: see Note [Shadowing] in SpecConstr.lhs

805
	runWhen spec_constr CoreDoSpecConstr,
806
807

	-- Final clean-up simplification:
808
     	CoreDoSimplify (SimplPhase 0) [
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
	  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

839
840
841
842
843
844
845
846
847
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

848
849
850
851
852
853
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) )
854
  ,  ( "v"		, OptIntSuffix setVerbosity )
855

856
857
858
859
860
861
862
863
864
865
866
867
868
869
        ------- 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) )  
870
  ,  ( "optc"		, HasArg (upd . addOptc) )  
871
872
873
874
875
876
  ,  ( "optm"		, HasArg (upd . addOptm) )  
  ,  ( "opta"		, HasArg (upd . addOpta) )  
  ,  ( "optl"		, HasArg (upd . addOptl) )  
  ,  ( "optdll"		, HasArg (upd . addOptdll) )  
  ,  ( "optdep"		, HasArg (upd . addOptdep) )

877
878
879
880
  ,  ( "split-objs"	, NoArg (if can_split
				    then setDynFlag Opt_SplitObjs
				    else return ()) )

881
882
883
	-------- Linking ----------------------------------------------------
  ,  ( "c"		, NoArg (upd $ \d -> d{ ghcLink=NoLink } ))
  ,  ( "no-link"	, NoArg (upd $ \d -> d{ ghcLink=NoLink } )) -- Dep.
884
  ,  ( "shared"		, NoArg (upd $ \d -> d{ ghcLink=LinkDynLib } ))
885
886
887
888
889
890
891
892
893
894
895
896

	------- 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 ------------------------------------------
897
  ,  ( "odir"		, HasArg (upd . setObjectDir  . Just))
898
899
900
901
902
903
904
  ,  ( "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))
905
  ,  ( "stubdir"	, HasArg (upd . setStubDir . Just))
906
907

	------- Keeping temporary files -------------------------------------
Ian Lynagh's avatar
Ian Lynagh committed
908
909
910
911
912
913
914
915
916
     -- These can be singular (think ghc -c) or plural (think ghc --make)
  ,  ( "keep-hc-file"    , NoArg (setDynFlag Opt_KeepHcFiles))
  ,  ( "keep-hc-files"   , NoArg (setDynFlag Opt_KeepHcFiles))
  ,  ( "keep-s-file"     , NoArg (setDynFlag Opt_KeepSFiles))
  ,  ( "keep-s-files"    , NoArg (setDynFlag Opt_KeepSFiles))
  ,  ( "keep-raw-s-file" , NoArg (setDynFlag Opt_KeepRawSFiles))
  ,  ( "keep-raw-s-files", NoArg (setDynFlag Opt_KeepRawSFiles))
     -- This only makes sense as plural
  ,  ( "keep-tmp-files"  , NoArg (setDynFlag Opt_KeepTmpFiles))
917
918
919
920

	------- Miscellaneous ----------------------------------------------
  ,  ( "no-hs-main"     , NoArg (setDynFlag Opt_NoHsMain))
  ,  ( "main-is"   	, SepArg setMainIs )
921
  ,  ( "haddock"	, NoArg (setDynFlag Opt_Haddock) )
andy@galois.com's avatar
andy@galois.com committed
922
  ,  ( "hpcdir"		, SepArg setOptHpcDir )
923

924
925
926
	------- recompilation checker (DEPRECATED, use -fforce-recomp) -----
  ,  ( "recomp"		, NoArg (unSetDynFlag Opt_ForceRecomp) )
  ,  ( "no-recomp"  	, NoArg (setDynFlag   Opt_ForceRecomp) )
927
928
929
930

        ------- Packages ----------------------------------------------------
  ,  ( "package-conf"   , HasArg extraPkgConf_ )
  ,  ( "no-user-package-conf", NoArg (unSetDynFlag Opt_ReadUserPackageConf) )
931
  ,  ( "package-name"   , HasArg (upd . setPackageName) )
932
933
  ,  ( "package"        , HasArg exposePackage )
  ,  ( "hide-package"   , HasArg hidePackage )
934
  ,  ( "hide-all-packages", NoArg (setDynFlag Opt_HideAllPackages) )
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
  ,  ( "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)
950
  ,  ( "ddump-cps-cmm",        	 setDumpFlag Opt_D_dump_cps_cmm)
951
952
953
954
955
956
957
  ,  ( "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)
958
  ,  ( "ddump-rule-firings",   	 setDumpFlag Opt_D_dump_rule_firings)
959
960
961
962
963
964
965
966
967
968
969
970
971
972
  ,  ( "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)
973
974
  ,  ( "ddump-rn-trace",         setDumpFlag Opt_D_dump_rn_trace)
  ,  ( "ddump-if-trace",         setDumpFlag Opt_D_dump_if_trace)
975
976
  ,  ( "ddump-tc-trace",         setDumpFlag Opt_D_dump_tc_trace)
  ,  ( "ddump-splices",          setDumpFlag Opt_D_dump_splices)
977
  ,  ( "ddump-rn-stats",         setDumpFlag Opt_D_dump_rn_stats)
978
979
980
981
982
983
984
  ,  ( "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)
  ,  ( "ddump-hi",               setDumpFlag Opt_D_dump_hi)
985
  ,  ( "ddump-minimal-imports",  setDumpFlag Opt_D_dump_minimal_imports)
986
  ,  ( "ddump-vect",         	 setDumpFlag Opt_D_dump_vect)
andy@galois.com's avatar
andy@galois.com committed
987
  ,  ( "ddump-hpc",         	 setDumpFlag Opt_D_dump_hpc)
988
  ,  ( "ddump-mod-cycles",     	 setDumpFlag Opt_D_dump_mod_cycles)
andy@galois.com's avatar
andy@galois.com committed
989
  
990
  ,  ( "ddump-hi-diffs",         NoArg (setDynFlag Opt_D_dump_hi_diffs))
991
992
993
  ,  ( "dcore-lint",       	 NoArg (setDynFlag Opt_DoCoreLinting))
  ,  ( "dstg-lint",        	 NoArg (setDynFlag Opt_DoStgLinting))
  ,  ( "dcmm-lint",		 NoArg (setDynFlag Opt_DoCmmLinting))
994
  ,  ( "dshow-passes",           NoArg (do setDynFlag Opt_ForceRecomp
995
				           setVerbosity (Just 2)) )
996
  ,  ( "dfaststring-stats",	 NoArg (setDynFlag Opt_D_faststring_stats))
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011

	------ 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 ------------------------------------------
1012
1013
1014
1015
  ,  ( "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
1016

1017
1018
  ,  ( "fmax-simplifier-iterations", IntSuffix (\n -> 
		upd (\dfs -> dfs{ maxSimplIterations = n })) )
1019
1020
1021
1022
1023

	-- 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 })))

1024
1025
  ,  ( "frule-check", SepArg (\s -> upd (\dfs -> dfs{ ruleCheck = Just s })))
  ,  ( "fcontext-stack"	, IntSuffix $ \n -> upd $ \dfs -> dfs{ ctxtStkDepth = n })
1026
1027
1028

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

1029
  ,  ( "fasm",		NoArg (setObjTarget HscAsm) )
1030
1031
1032
  ,  ( "fvia-c",	NoArg (setObjTarget HscC) )
  ,  ( "fvia-C",	NoArg (setObjTarget HscC) )

1033
  ,  ( "fno-code",	NoArg (setTarget HscNothing))
1034
1035
  ,  ( "fbyte-code",    NoArg (setTarget HscInterpreted) )
  ,  ( "fobject-code",  NoArg (setTarget defaultHscTarget) )
1036
1037
1038
1039
1040

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

	-- the rest of the -f* and -fno-* flags
1041
1042
1043
1044
  ,  ( "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
1045
  ,  ( "f",		PrefixPred (isFlag xFlags) (\f ->  setDynFlag (getFlag xFlags f)) )
1046
  ,  ( "f", 		PrefixPred (isNoFlag xFlags) (\f -> unSetDynFlag (getNoFlag xFlags f)) )
1047
1048
1049
1050

	-- 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)) )
1051
1052
1053
1054
1055
1056
1057
 ]

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

fFlags = [
  ( "warn-duplicate-exports",    	Opt_WarnDuplicateExports ),
  ( "warn-hi-shadowing",         	Opt_WarnHiShadows ),
1058
  ( "warn-implicit-prelude",            Opt_WarnImplicitPrelude ),
1059
1060
1061
1062
1063
1064
1065
1066
1067
  ( "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 ),
1068
  ( "warn-monomorphism-restriction",   	Opt_WarnMonomorphism ),
1069
1070
1071
1072
1073
  ( "warn-unused-binds",         	Opt_WarnUnusedBinds ),
  ( "warn-unused-imports",       	Opt_WarnUnusedImports ),
  ( "warn-unused-matches",       	Opt_WarnUnusedMatches ),
  ( "warn-deprecations",         	Opt_WarnDeprecations ),
  ( "warn-orphans",	         	Opt_WarnOrphans ),
1074
  ( "warn-tabs",	         	Opt_WarnTabs ),
1075
1076
  ( "strictness",			Opt_Strictness ),
  ( "full-laziness",			Opt_FullLaziness ),
1077
1078
  ( "liberate-case",			Opt_LiberateCase ),
  ( "spec-constr",			Opt_SpecConstr ),
1079
1080
1081
1082
1083
  ( "cse",				Opt_CSE ),
  ( "ignore-interface-pragmas",		Opt_IgnoreInterfacePragmas ),
  ( "omit-interface-pragmas",		Opt_OmitInterfacePragmas ),
  ( "do-lambda-eta-expansion",		Opt_DoLambdaEtaExpansion ),
  ( "ignore-asserts",			Opt_IgnoreAsserts ),
1084
  ( "ignore-breakpoints",               Opt_IgnoreBreakpoints),
1085
1086
1087
  ( "do-eta-reduction",			Opt_DoEtaReduction ),
  ( "case-merge",			Opt_CaseMerge ),
  ( "unbox-strict-fields",		Opt_UnboxStrictFields ),
1088
  ( "dicts-cheap",			Opt_DictsCheap ),
1089
  ( "excess-precision",			Opt_ExcessPrecision ),
1090
  ( "asm-mangling",			Opt_DoAsmMangling ),
1091
  ( "print-bind-result",		Opt_PrintBindResult ),
1092
  ( "force-recomp",			Opt_ForceRecomp ),
1093
  ( "hpc-no-auto",			Opt_Hpc_No_Auto ),
1094
  ( "rewrite-rules",			Opt_RewriteRules ),
rl@cse.unsw.edu.au's avatar
rl@cse.unsw.edu.au committed
1095
1096
  ( "break-on-exception",               Opt_BreakOnException ),
  ( "vectorise",                        Opt_Vectorise )
1097
1098
  ]

1099

1100
1101
1102
-- These -X<blah> flags can all be reversed with -Xno-<blah>
xFlags :: [(String, DynFlag)]
xFlags = [
1103
  ( "MagicHash",                        Opt_MagicHash ),
Ian Lynagh's avatar
Ian Lynagh committed
1104
  ( "KindSignatures",                   Opt_KindSignatures ),
Ian Lynagh's avatar
Ian Lynagh committed
1105
  ( "EmptyDataDecls",                   Opt_EmptyDataDecls ),
Ian Lynagh's avatar
Ian Lynagh committed
1106
  ( "ParallelListComp",                 Opt_ParallelListComp ),
1107
1108
  ( "FI",				Opt_FFI ),  -- support `-ffi'...
  ( "FFI",				Opt_FFI ),  -- ...and also `-fffi'
Ian Lynagh's avatar
Ian Lynagh committed
1109
  ( "ForeignFunctionInterface",		Opt_FFI ),
1110

Ian Lynagh's avatar
Ian Lynagh committed
1111
  ( "RecursiveDo",                      Opt_RecursiveDo ),
1112
1113
1114
  ( "Arrows",				Opt_Arrows ), -- arrow syntax
  ( "Parr",				Opt_PArr ),

Ian Lynagh's avatar
Ian Lynagh committed
1115
  ( "TH",				Opt_TH ), -- support -fth
1116
1117
1118
1119
1120
1121
  ( "TemplateHaskelll",			Opt_TH ),

  ( "Generics",  			Opt_Generics ),

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

1122
1123
1124
1125
  ( "RecordWildCards",			Opt_RecordWildCards ),
  ( "RecordPuns",			Opt_RecordPuns ),
  ( "DisambiguateRecordFields",		Opt_DisambiguateRecordFields ),

1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
  ( "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 ),
Ian Lynagh's avatar
Ian Lynagh committed
1136
  ( "MultiParamTypeClasses",        Opt_MultiParamTypeClasses ),
1137
  ( "FunctionalDependencies",        Opt_FunctionalDependencies ),
1138
  ( "GeneralizedNewtypeDeriving",   Opt_GeneralizedNewtypeDeriving ),
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
  ( "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 
1151
		   , Opt_GADTs
1152
1153
		   , Opt_ImplicitParams 
		   , Opt_ScopedTypeVariables
Ian Lynagh's avatar
Ian Lynagh committed
1154
           , Opt_MultiParamTypeClasses
1155
           , Opt_FunctionalDependencies
1156
		   , Opt_MagicHash
Ian Lynagh's avatar
Ian Lynagh committed
1157
           , Opt_RecursiveDo
Ian Lynagh's avatar
Ian Lynagh committed
1158
           , Opt_ParallelListComp
Ian Lynagh's avatar
Ian Lynagh committed
1159
           , Opt_EmptyDataDecls
Ian Lynagh's avatar
Ian Lynagh committed
1160
           , Opt_KindSignatures
1161
           , Opt_GeneralizedNewtypeDeriving
1162
1163
1164
1165
1166
1167
		   , Opt_TypeFamilies ]

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

isFlag flags f = is_flag flags (normaliseFlag f)
1168

1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
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)

1181
getNoFlag flags f = get_flag flags (fromJust (noFlag_maybe (normaliseFlag f)))
1182
1183
			-- The flag should be a no-flag already

1184
1185
1186
get_flag flags nf = case [ opt | (ff, opt) <- flags, normaliseFlag ff == nf] of
			(o:os) -> o
			[]     -> panic ("get_flag " ++ nf)
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201

------------------
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
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221

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

1222
--------------------------
1223
setDynFlag, unSetDynFlag :: DynFlag -> DynP ()
1224
1225
1226
1227
1228
1229
1230
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)

1231
1232
unSetDynFlag f = upd (\dfs -> dopt_unset dfs f)

1233
--------------------------
1234
1235
setDumpFlag :: DynFlag -> OptKind DynP
setDumpFlag dump_flag 
1236
  = NoArg (setDynFlag Opt_ForceRecomp >> setDynFlag dump_flag)
1237
1238
1239
	-- Whenver we -ddump, switch off the recompilation checker,
	-- else you don't see the dump!

1240
1241
setVerbosity :: Maybe Int -> DynP ()
setVerbosity mb_n = upd (\dfs -> dfs{ verbosity = mb_n `orElse` 3 })
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252

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 })
1253

Simon Marlow's avatar
Simon Marlow committed
1254
1255
1256
1257
setPackageName p
  | Nothing <- unpackPackageId pid
  = throwDyn (CmdLineError ("cannot parse \'" ++ p ++ "\' as a package identifier"))
  | otherwise
1258
  = \s -> s{ thisPackage = pid }
Simon Marlow's avatar
Simon Marlow committed
1259
1260
  where
        pid = stringToPackageId p
1261

1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
-- 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
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291

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
1292
  | not (null main_fn)		-- The arg looked like "Foo.baz"
1293
  = upd $ \d -> d{ mainFunIs = Just main_fn,
Simon Marlow's avatar
Simon Marlow committed
1294
	  	   mainModIs = mkModule mainPackageId (mkModuleName main_mod) }
1295

1296
  | isUpper (head main_mod)	-- The arg looked like "Foo"
Simon Marlow's avatar
Simon Marlow committed
1297
  = upd $ \d -> d{ mainModIs = mkModule mainPackageId (mkModuleName main_mod) }
1298
1299
  
  | otherwise			-- The arg looked like "baz"
1300
  = upd $ \d -> d{ mainFunIs = Just main_mod }
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
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
  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.
1345
1346
1347
1348
1349
    splitUp []             = []
    splitUp (x:':':div:xs) | div `elem` dir_markers
			   = ((x:':':div:p): splitUp rs)
			   where
			      (p,rs) = findNextPath xs
1350
1351
1352
	  -- 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 
1353
1354
1355
    splitUp xs = cons p (splitUp rs)
	       where
		 (p,rs) = findNextPath xs
1356
    
1357
1358
		 cons "" xs = xs
		 cons x  xs = x:xs
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374

    -- 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

1375
1376
1377
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
-- -----------------------------------------------------------------------------
-- 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
1409
1410

-----------------------------------------------------------------------------
andy@galois.com's avatar
andy@galois.com committed
1411
1412
1413
1414
1415
1416
-- Hpc stuff

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

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