DynFlags.hs 51.9 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_MagicHash
Ian Lynagh's avatar
Ian Lynagh committed
188
   | Opt_EmptyDataDecls
Ian Lynagh's avatar
Ian Lynagh committed
189
   | Opt_KindSignatures
Ian Lynagh's avatar
Ian Lynagh committed
190
   | Opt_ParallelListComp
191
   | Opt_GeneralizedNewtypeDeriving
192
193
194
195
196

   -- optimisation opts
   | Opt_Strictness
   | Opt_FullLaziness
   | Opt_CSE
197
198
   | Opt_LiberateCase
   | Opt_SpecConstr
199
200
201
202
   | Opt_IgnoreInterfacePragmas
   | Opt_OmitInterfacePragmas
   | Opt_DoLambdaEtaExpansion
   | Opt_IgnoreAsserts
203
   | Opt_IgnoreBreakpoints
204
205
206
   | Opt_DoEtaReduction
   | Opt_CaseMerge
   | Opt_UnboxStrictFields
207
   | Opt_DictsCheap
208
   | Opt_RewriteRules
rl@cse.unsw.edu.au's avatar
rl@cse.unsw.edu.au committed
209
   | Opt_Vectorise
210
211
212
213

   -- misc opts
   | Opt_Cpp
   | Opt_Pp
214
   | Opt_ForceRecomp
215
216
217
218
219
220
221
   | Opt_DryRun
   | Opt_DoAsmMangling
   | Opt_ExcessPrecision
   | Opt_ReadUserPackageConf
   | Opt_NoHsMain
   | Opt_SplitObjs
   | Opt_StgStats
222
   | Opt_HideAllPackages
223
   | Opt_PrintBindResult
224
   | Opt_Haddock
225
   | Opt_Hpc_No_Auto
226
   | Opt_BreakOnException
227
228
229
230
231
232
233
234
235

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

   deriving (Eq)
236
 
237
238
239
240
241
242
243
244
245
246
247
248
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,
249
250

  specThreshold		:: Int,		-- Threshold for function specialisation
251

252
253
254
  stolen_x86_regs	:: Int,		
  cmdlineHcIncludes	:: [String],	-- -#includes
  importPaths		:: [FilePath],
255
  mainModIs		:: Module,
256
  mainFunIs		:: Maybe String,
257
258
  ctxtStkDepth	        :: Int,		-- Typechecker context stack depth

Simon Marlow's avatar
Simon Marlow committed
259
  thisPackage		:: PackageId,
260
261
262
263
264
265
266

  -- 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.
267
268
269
270
  objectDir		:: Maybe String,
  hiDir			:: Maybe String,
  stubDir		:: Maybe String,

271
272
273
  objectSuf		:: String,
  hcSuf			:: String,
  hiSuf			:: String,
274
275
276
277

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

278
279
280
281
  includePaths		:: [String],
  libraryPaths		:: [String],
  frameworkPaths	:: [String],  	-- used on darwin only
  cmdlineFrameworks	:: [String],	-- ditto
282
  tmpDir		:: String,	-- no trailing '/'
283
  
284
285
286
  ghcUsagePath          :: FilePath,    -- Filled in by SysTools
  ghciUsagePath         :: FilePath,    -- ditto

andy@galois.com's avatar
andy@galois.com committed
287
288
  hpcDir		:: String,	-- ^ path to store the .mix files

289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
  -- 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]),
310
311
  pgm_T                 :: String,
  pgm_sysman            :: String,
312

313
  --  Package flags
314
  extraPkgConfs		:: [FilePath],
315
316
  topDir                :: FilePath,    -- filled in by SysTools
  systemPackageConfig   :: FilePath,    -- ditto
317
318
319
320
321
322
	-- 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

323
324
325
326
  -- Package state
  -- NB. do not modify this field, it is calculated by 
  -- Packages.initPackages and Packages.updatePackages.
  pkgDatabase           :: Maybe (UniqFM InstalledPackageInfo),
327
328
329
  pkgState		:: PackageState,

  -- hsc dynamic flags
330
331
332
333
  flags      		:: [DynFlag],
  
  -- message output
  log_action            :: Severity -> SrcSpan -> PprStyle -> Message -> IO ()
334
335
336
337
338
339
340
341
342
343
 }

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

344
345
346
347
348
349
350
351
352
353
354
355
-- | 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.
356
data GhcMode
357
358
359
  = CompManager         -- ^ --make, GHCi, etc.
  | OneShot		-- ^ ghc -c Foo.hs
  | MkDepend            -- ^ ghc -M, see Finder for why we need this
360
361
362
363
364
365
  deriving Eq

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

366
-- | What kind of linking to do.
367
data GhcLink	-- What to do in the link step, if there is one
368
369
370
  = NoLink		-- Don't link at all
  | LinkBinary		-- Link object code into a binary
  | LinkInMemory        -- Use the in-memory dynamic linker
371
  | LinkDynLib		-- Link objects into a dynamic lib (DLL on Windows, DSO on ELF platforms)
372
  deriving Eq
373
374
375
376
377
378
379
380
381

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

data PackageFlag
  = ExposePackage  String
  | HidePackage    String
  | IgnorePackage  String
382
  deriving Eq
383

384
385
386
387
388
defaultHscTarget = defaultObjectTarget

-- | the 'HscTarget' value corresponding to the default way to create
-- object files on the current platform.
defaultObjectTarget
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
  | 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 {
405
406
	ghcMode			= CompManager,
	ghcLink			= LinkBinary,
407
408
409
410
411
412
413
414
415
	coreToDo 		= Nothing,
	stgToDo			= Nothing, 
	hscTarget		= defaultHscTarget, 
	hscOutName		= "", 
	extCoreName		= "",
	verbosity		= 0, 
	optLevel		= 0,
	maxSimplIterations	= 4,
	ruleCheck		= Nothing,
416
	specThreshold		= 200,
417
418
419
	stolen_x86_regs		= 4,
	cmdlineHcIncludes	= [],
	importPaths		= ["."],
420
	mainModIs		= mAIN,
421
	mainFunIs		= Nothing,
422
423
	ctxtStkDepth		= mAX_CONTEXT_REDUCTION_DEPTH,

Simon Marlow's avatar
Simon Marlow committed
424
	thisPackage		= mainPackageId,
425

426
427
428
429
	objectDir		= Nothing,
	hiDir			= Nothing,
	stubDir			= Nothing,

430
431
432
	objectSuf		= phaseInputExt StopLn,
	hcSuf			= phaseInputExt HCc,
	hiSuf			= "hi",
433
434
435

	outputFile		= Nothing,
	outputHi		= Nothing,
436
437
438
439
	includePaths		= [],
	libraryPaths		= [],
	frameworkPaths		= [],
	cmdlineFrameworks	= [],
440
	tmpDir			= cDEFAULT_TMPDIR,
441
	
andy@galois.com's avatar
andy@galois.com committed
442
443
        hpcDir		        = ".hpc",

444
445
446
447
448
449
450
451
452
453
454
455
	opt_L			= [],
	opt_P			= [],
	opt_F			= [],
	opt_c			= [],
	opt_a			= [],
	opt_m			= [],
	opt_l			= [],
	opt_dll			= [],
	opt_dep			= [],
	
	extraPkgConfs		= [],
	packageFlags		= [],
456
457
        pkgDatabase             = Nothing,
        pkgState                = panic "no package state yet: call GHC.setSessionDynFlags",
458
459
460
	flags = [ 
    	    Opt_ReadUserPackageConf,
    
461
462
463
464
	    Opt_MonoPatBinds, 	-- Experimentally, I'm making this non-standard
				-- behaviour the default, to see if anyone notices
				-- SLPJ July 06

465
466
    	    Opt_ImplicitPrelude,
    	    Opt_MonomorphismRestriction,
467

468
469
    	    Opt_DoAsmMangling,
    
470
	    -- on by default:
471
472
473
474
	    Opt_PrintBindResult ]
	    ++ [f | (ns,f) <- optLevelFlags, 0 `elem` ns]
	    	    -- The default -O0 options
	    ++ standardWarnings,
475
476
477
478
479
480
               
        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))
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
      }

{- 
    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 =  ""

512
513
514
515
setObjectDir  f d = d{ objectDir  = f}
setHiDir      f d = d{ hiDir      = f}
setStubDir    f d = d{ stubDir    = f}

516
517
setObjectSuf  f d = d{ objectSuf  = f}
setHiSuf      f d = d{ hiSuf      = f}
518
519
520
521
setHcSuf      f d = d{ hcSuf      = f}

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

-- 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
571
  = dfs2{ optLevel = final_n }
572
  where
573
   final_n = max 0 (min 2 n)	-- Clamp to 0 <= n <= 2
574
575
576
   dfs1 = foldr (flip dopt_unset) dfs  remove_dopts
   dfs2 = foldr (flip dopt_set)   dfs1 extra_dopts

577
578
   extra_dopts  = [ f | (ns,f) <- optLevelFlags, final_n `elem` ns ]
   remove_dopts = [ f | (ns,f) <- optLevelFlags, final_n `notElem` ns ]
579
	
580
581
582
583
optLevelFlags :: [([Int], DynFlag)]
optLevelFlags
  = [ ([0],	Opt_IgnoreInterfacePragmas)
    , ([0],     Opt_OmitInterfacePragmas)
584

585
    , ([1,2],	Opt_IgnoreAsserts)
586
587
    , ([1,2],	Opt_RewriteRules)	-- Off for -O0; see Note [Scoping for Builtin rules]
					-- 		in PrelRules
588
589
590
591
592
    , ([1,2],	Opt_DoEtaReduction)
    , ([1,2],	Opt_CaseMerge)
    , ([1,2],	Opt_Strictness)
    , ([1,2],	Opt_CSE)
    , ([1,2],	Opt_FullLaziness)
593

594
595
596
597
598
599
600
601
    , ([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.
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
    ]

-- -----------------------------------------------------------------------------
-- 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
659
660
  | CoreDoNothing 		 -- Useful when building up 
  | CoreDoPasses [CoreToDo] 	 -- lists of these things
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676

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:
677
678
679
runWhen :: Bool -> CoreToDo -> CoreToDo
runWhen True  do_this = do_this
runWhen False do_this = CoreDoNothing
680
681
682
683
684
685
686
687
688
689
690

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
691
692
    spec_constr   = dopt Opt_SpecConstr dflags
    liberate_case = dopt Opt_LiberateCase dflags
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
    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
716
717
            NoCaseOfCase,	-- Don't do case-of-case transformations.
				-- This makes full laziness work better
718
719
720
721
722
723
724
	    MaxSimplifierIterations max_iter
	],

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

725
	runWhen full_laziness (CoreDoFloatOutwards (FloatOutSw False False)),
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

	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
764
	CoreDoOldStrictness,
765
#endif
766
767
768
769
770
771
772
773
774
775
776
	runWhen strictness (CoreDoPasses [
		CoreDoStrictness,
		CoreDoWorkerWrapper,
		CoreDoGlomBinds,
		CoreDoSimplify (SimplPhase 0) [
		   MaxSimplifierIterations max_iter
		]]),

	runWhen full_laziness 
	  (CoreDoFloatOutwards (FloatOutSw False    -- Not lambdas
					   True)),  -- Float constants
777
778
779
780
781
782
783
		-- 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)


784
785
786
787
	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
788
789
790

	CoreDoFloatInwards,

791
	case rule_check of { Just pat -> CoreDoRuleCheck 0 pat; Nothing -> CoreDoNothing },
792

793
794
795
796
797
		-- Case-liberation for -O2.  This should be after
		-- strictness analysis and the simplification which follows it.
	runWhen liberate_case (CoreDoPasses [
	    CoreLiberateCase,
	    CoreDoSimplify (SimplPhase 0) [
798
		  MaxSimplifierIterations max_iter
799
	    ] ]),	-- Run the simplifier after LiberateCase to vastly 
800
801
802
			-- reduce the possiblility of shadowing
			-- Reason: see Note [Shadowing] in SpecConstr.lhs

803
	runWhen spec_constr CoreDoSpecConstr,
804
805

	-- Final clean-up simplification:
806
     	CoreDoSimplify (SimplPhase 0) [
807
808
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
	  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

837
838
839
840
841
842
843
844
845
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

846
847
848
849
850
851
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) )
852
  ,  ( "v"		, OptIntSuffix setVerbosity )
853

854
855
856
857
858
859
860
861
862
863
864
865
866
867
        ------- 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) )  
868
  ,  ( "optc"		, HasArg (upd . addOptc) )  
869
870
871
872
873
874
  ,  ( "optm"		, HasArg (upd . addOptm) )  
  ,  ( "opta"		, HasArg (upd . addOpta) )  
  ,  ( "optl"		, HasArg (upd . addOptl) )  
  ,  ( "optdll"		, HasArg (upd . addOptdll) )  
  ,  ( "optdep"		, HasArg (upd . addOptdep) )

875
876
877
878
  ,  ( "split-objs"	, NoArg (if can_split
				    then setDynFlag Opt_SplitObjs
				    else return ()) )

879
880
881
	-------- Linking ----------------------------------------------------
  ,  ( "c"		, NoArg (upd $ \d -> d{ ghcLink=NoLink } ))
  ,  ( "no-link"	, NoArg (upd $ \d -> d{ ghcLink=NoLink } )) -- Dep.
882
  ,  ( "shared"		, NoArg (upd $ \d -> d{ ghcLink=LinkDynLib } ))
883
884
885
886
887
888
889
890
891
892
893
894

	------- 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 ------------------------------------------
895
  ,  ( "odir"		, HasArg (upd . setObjectDir  . Just))
896
897
898
899
900
901
902
  ,  ( "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))
903
  ,  ( "stubdir"	, HasArg (upd . setStubDir . Just))
904
905

	------- Keeping temporary files -------------------------------------
Ian Lynagh's avatar
Ian Lynagh committed
906
907
908
909
910
911
912
913
914
     -- 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))
915
916
917
918

	------- Miscellaneous ----------------------------------------------
  ,  ( "no-hs-main"     , NoArg (setDynFlag Opt_NoHsMain))
  ,  ( "main-is"   	, SepArg setMainIs )
919
  ,  ( "haddock"	, NoArg (setDynFlag Opt_Haddock) )
andy@galois.com's avatar
andy@galois.com committed
920
  ,  ( "hpcdir"		, SepArg setOptHpcDir )
921

922
923
924
	------- recompilation checker (DEPRECATED, use -fforce-recomp) -----
  ,  ( "recomp"		, NoArg (unSetDynFlag Opt_ForceRecomp) )
  ,  ( "no-recomp"  	, NoArg (setDynFlag   Opt_ForceRecomp) )
925
926
927
928

        ------- Packages ----------------------------------------------------
  ,  ( "package-conf"   , HasArg extraPkgConf_ )
  ,  ( "no-user-package-conf", NoArg (unSetDynFlag Opt_ReadUserPackageConf) )
929
  ,  ( "package-name"   , HasArg (upd . setPackageName) )
930
931
  ,  ( "package"        , HasArg exposePackage )
  ,  ( "hide-package"   , HasArg hidePackage )
932
  ,  ( "hide-all-packages", NoArg (setDynFlag Opt_HideAllPackages) )
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
  ,  ( "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)
948
  ,  ( "ddump-cps-cmm",        	 setDumpFlag Opt_D_dump_cps_cmm)
949
950
951
952
953
954
955
  ,  ( "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)
956
  ,  ( "ddump-rule-firings",   	 setDumpFlag Opt_D_dump_rule_firings)
957
958
959
960
961
962
963
964
965
966
967
968
969
970
  ,  ( "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)
971
972
  ,  ( "ddump-rn-trace",         setDumpFlag Opt_D_dump_rn_trace)
  ,  ( "ddump-if-trace",         setDumpFlag Opt_D_dump_if_trace)
973
974
  ,  ( "ddump-tc-trace",         setDumpFlag Opt_D_dump_tc_trace)
  ,  ( "ddump-splices",          setDumpFlag Opt_D_dump_splices)
975
  ,  ( "ddump-rn-stats",         setDumpFlag Opt_D_dump_rn_stats)
976
977
978
979
980
981
982
  ,  ( "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)
983
  ,  ( "ddump-minimal-imports",  setDumpFlag Opt_D_dump_minimal_imports)
984
  ,  ( "ddump-vect",         	 setDumpFlag Opt_D_dump_vect)
andy@galois.com's avatar
andy@galois.com committed
985
  ,  ( "ddump-hpc",         	 setDumpFlag Opt_D_dump_hpc)
986
  ,  ( "ddump-mod-cycles",     	 setDumpFlag Opt_D_dump_mod_cycles)
andy@galois.com's avatar
andy@galois.com committed
987
  
988
  ,  ( "ddump-hi-diffs",         NoArg (setDynFlag Opt_D_dump_hi_diffs))
989
990
991
  ,  ( "dcore-lint",       	 NoArg (setDynFlag Opt_DoCoreLinting))
  ,  ( "dstg-lint",        	 NoArg (setDynFlag Opt_DoStgLinting))
  ,  ( "dcmm-lint",		 NoArg (setDynFlag Opt_DoCmmLinting))
992
  ,  ( "dshow-passes",           NoArg (do setDynFlag Opt_ForceRecomp
993
				           setVerbosity (Just 2)) )
994
  ,  ( "dfaststring-stats",	 NoArg (setDynFlag Opt_D_faststring_stats))
995
996
997
998
999
1000

	------ 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}) ))
For faster browsing, not all history is shown. View entire blame