DynFlags.hs 93.9 KB
Newer Older
1
-- |
2
3
4
5
6
7
-- Dynamic flags
--
--
-- (c) The University of Glasgow 2005
--

8
-- Most flags are dynamic flags, which means they can change from
9
10
11
-- 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.
12
module DynFlags (
13
        -- * Dynamic flags and associated configuration types
Ian Lynagh's avatar
Ian Lynagh committed
14
15
16
17
18
19
20
21
        DynFlag(..),
        DynFlags(..),
        HscTarget(..), isObjectTarget, defaultObjectTarget,
        GhcMode(..), isOneShot,
        GhcLink(..), isNoLink,
        PackageFlag(..),
        Option(..),
        DynLibLoader(..),
22
        fFlags, xFlags,
23
        dphPackage,
24

25
        -- ** Manipulating DynFlags
Ian Lynagh's avatar
Ian Lynagh committed
26
27
28
29
30
        defaultDynFlags,                -- DynFlags
        initDynFlags,                   -- DynFlags -> IO DynFlags

        dopt,                           -- DynFlag -> DynFlags -> Bool
        dopt_set, dopt_unset,           -- DynFlags -> DynFlag -> DynFlags
31
        getOpts,                        -- DynFlags -> (DynFlags -> [a]) -> [a]
Ian Lynagh's avatar
Ian Lynagh committed
32
33
34
35
        getVerbFlag,
        updOptLevel,
        setTmpDir,
        setPackageName,
36
        doingTickyProfiling,
Ian Lynagh's avatar
Ian Lynagh committed
37

38
        -- ** Parsing DynFlags
Ian Lynagh's avatar
Ian Lynagh committed
39
        parseDynamicFlags,
40
        parseDynamicNoPackageFlags,
41
        allFlags,
42

43
44
45
        supportedLanguages, languageOptions,

        -- ** DynFlag C compiler options
Ian Lynagh's avatar
Ian Lynagh committed
46
        machdepCCOpts, picCCOpts,
47
48
49
50
51
52
53
54
55
56
57
58
59
60

        -- * Configuration of the core-to-core passes
        CoreToDo(..),
        SimplifierMode(..),
        SimplifierSwitch(..),
        FloatOutSwitches(..),
        getCoreToDo,

        -- * Configuration of the stg-to-stg passes
        StgToDo(..),
        getStgToDo,

        -- * Compiler configuration suitable for display to the user
        compilerInfo
61
62
63
64
  ) where

#include "HsVersions.h"

65
#ifndef OMIT_NATIVE_CODEGEN
66
import Platform
67
#endif
68
import Module
Simon Marlow's avatar
Simon Marlow committed
69
import PackageConfig
70
import PrelNames        ( mAIN )
Ian Lynagh's avatar
Ian Lynagh committed
71
#if defined(i386_TARGET_ARCH) || (!defined(mingw32_TARGET_OS) && !defined(darwin_TARGET_OS))
Ian Lynagh's avatar
Ian Lynagh committed
72
import StaticFlags      ( opt_Static )
Simon Marlow's avatar
Simon Marlow committed
73
#endif
Ian Lynagh's avatar
Ian Lynagh committed
74
75
import StaticFlags      ( opt_PIC, WayName(..), v_Ways, v_Build_tag,
                          v_RTS_Build_tag )
76
import {-# SOURCE #-} Packages (PackageState)
Ian Lynagh's avatar
Ian Lynagh committed
77
import DriverPhases     ( Phase(..), phaseInputExt )
78
79
import Config
import CmdLineParser
Ian Lynagh's avatar
Ian Lynagh committed
80
import Constants        ( mAX_CONTEXT_REDUCTION_DEPTH )
81
import Panic
82
import UniqFM           ( UniqFM )
83
import Util
84
import Maybes           ( orElse )
85
import SrcLoc
86
import FastString
87
import FiniteMap
Simon Marlow's avatar
Simon Marlow committed
88
89
import Outputable
import {-# SOURCE #-} ErrUtils ( Severity(..), Message, mkLocMessage )
90

91
import Data.IORef
Ian Lynagh's avatar
Ian Lynagh committed
92
import Control.Monad    ( when )
simonpj@microsoft.com's avatar
simonpj@microsoft.com committed
93

94
import Data.Char
95
import Data.List
Ian Lynagh's avatar
Ian Lynagh committed
96
import System.FilePath
97
import System.IO        ( stderr, hPutChar )
98

99
100
101
-- -----------------------------------------------------------------------------
-- DynFlags

102
-- | Enumerates the simple on-or-off dynamic flags
103
104
105
106
data DynFlag

   -- debugging flags
   = Opt_D_dump_cmm
107
   | Opt_D_dump_cmmz
108
   | Opt_D_dump_cmmz_pretty
109
   | Opt_D_dump_cps_cmm
110
   | Opt_D_dump_cvt_cmm
111
   | Opt_D_dump_asm
112
113
   | Opt_D_dump_asm_native
   | Opt_D_dump_asm_liveness
114
   | Opt_D_dump_asm_coalesce
115
116
117
   | Opt_D_dump_asm_regalloc
   | Opt_D_dump_asm_regalloc_stages
   | Opt_D_dump_asm_conflicts
118
   | Opt_D_dump_asm_stats
119
   | Opt_D_dump_asm_expanded
120
121
122
123
124
125
   | Opt_D_dump_cpranal
   | Opt_D_dump_deriv
   | Opt_D_dump_ds
   | Opt_D_dump_flatC
   | Opt_D_dump_foreign
   | Opt_D_dump_inlinings
126
   | Opt_D_dump_rule_firings
127
128
129
130
131
   | Opt_D_dump_occur_anal
   | Opt_D_dump_parsed
   | Opt_D_dump_rn
   | Opt_D_dump_simpl
   | Opt_D_dump_simpl_iterations
132
   | Opt_D_dump_simpl_phases
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
   | 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
151
   | Opt_D_dump_hpc
pepe's avatar
pepe committed
152
   | Opt_D_dump_rtti
153
154
155
156
157
158
   | 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
159
   | Opt_D_dump_mod_cycles
160
   | Opt_D_dump_view_pattern_commoning
161
   | Opt_D_faststring_stats
Ian Lynagh's avatar
Ian Lynagh committed
162
   | Opt_DumpToFile                     -- ^ Append dump output to files instead of stdout.
Simon Marlow's avatar
Simon Marlow committed
163
   | Opt_D_no_debug_output
164
165
166
   | Opt_DoCoreLinting
   | Opt_DoStgLinting
   | Opt_DoCmmLinting
Ben.Lippmeier@anu.edu.au's avatar
Ben.Lippmeier@anu.edu.au committed
167
   | Opt_DoAsmLinting
168

Ian Lynagh's avatar
Ian Lynagh committed
169
   | Opt_WarnIsError                    -- -Werror; makes warnings fatal
170
171
   | Opt_WarnDuplicateExports
   | Opt_WarnHiShadows
172
   | Opt_WarnImplicitPrelude
173
174
175
176
177
178
179
180
181
   | Opt_WarnIncompletePatterns
   | Opt_WarnIncompletePatternsRecUpd
   | Opt_WarnMissingFields
   | Opt_WarnMissingMethods
   | Opt_WarnMissingSigs
   | Opt_WarnNameShadowing
   | Opt_WarnOverlappingPatterns
   | Opt_WarnSimplePatterns
   | Opt_WarnTypeDefaults
182
   | Opt_WarnMonomorphism
183
184
185
   | Opt_WarnUnusedBinds
   | Opt_WarnUnusedImports
   | Opt_WarnUnusedMatches
Ian Lynagh's avatar
Ian Lynagh committed
186
   | Opt_WarnWarningsDeprecations
187
   | Opt_WarnDeprecatedFlags
188
189
   | Opt_WarnDodgyImports
   | Opt_WarnOrphans
190
   | Opt_WarnTabs
191
   | Opt_WarnUnrecognisedPragmas
192
   | Opt_WarnDodgyForeignImports
193
   | Opt_WarnLazyUnliftedBindings
194
195
196
   | Opt_WarnUnusedDoBind
   | Opt_WarnWrongDoBind

197
198

   -- language opts
199
200
201
   | Opt_OverlappingInstances
   | Opt_UndecidableInstances
   | Opt_IncoherentInstances
202
   | Opt_MonomorphismRestriction
203
   | Opt_MonoPatBinds
204
   | Opt_MonoLocalBinds
Ian Lynagh's avatar
Ian Lynagh committed
205
   | Opt_ExtendedDefaultRules           -- Use GHC's extended rules for defaulting
206
   | Opt_ForeignFunctionInterface
Ian Lynagh's avatar
Ian Lynagh committed
207
   | Opt_UnliftedFFITypes
208
   | Opt_GHCForeignImportPrim
Ian Lynagh's avatar
Ian Lynagh committed
209
210
   | Opt_PArr                           -- Syntactic support for parallel arrays
   | Opt_Arrows                         -- Arrow-notation syntax
211
   | Opt_TemplateHaskell
212
   | Opt_QuasiQuotes
213
   | Opt_ImplicitParams
214
   | Opt_Generics			-- "Derivable type classes"
Ian Lynagh's avatar
Ian Lynagh committed
215
   | Opt_ImplicitPrelude
216
   | Opt_ScopedTypeVariables
Ian Lynagh's avatar
Ian Lynagh committed
217
   | Opt_UnboxedTuples
simonpj@microsoft.com's avatar
simonpj@microsoft.com committed
218
   | Opt_BangPatterns
219
   | Opt_TypeFamilies
220
   | Opt_OverloadedStrings
221
   | Opt_DisambiguateRecordFields
222
   | Opt_RecordWildCards
223
   | Opt_RecordPuns
224
   | Opt_ViewPatterns
225
   | Opt_GADTs
226
   | Opt_RelaxedPolyRec
227

228
   | Opt_StandaloneDeriving
229
   | Opt_DeriveDataTypeable
230
   | Opt_DeriveFunctor
231
232
233
   | Opt_DeriveTraversable
   | Opt_DeriveFoldable

234
   | Opt_TypeSynonymInstances
Ian Lynagh's avatar
Ian Lynagh committed
235
   | Opt_FlexibleContexts
236
   | Opt_FlexibleInstances
237
   | Opt_ConstrainedClassMethods
Ian Lynagh's avatar
Ian Lynagh committed
238
   | Opt_MultiParamTypeClasses
239
   | Opt_FunctionalDependencies
Ian Lynagh's avatar
Ian Lynagh committed
240
   | Opt_UnicodeSyntax
Ian Lynagh's avatar
Ian Lynagh committed
241
   | Opt_PolymorphicComponents
242
   | Opt_ExistentialQuantification
243
   | Opt_MagicHash
Ian Lynagh's avatar
Ian Lynagh committed
244
   | Opt_EmptyDataDecls
Ian Lynagh's avatar
Ian Lynagh committed
245
   | Opt_KindSignatures
Ian Lynagh's avatar
Ian Lynagh committed
246
   | Opt_ParallelListComp
247
   | Opt_TransformListComp
248
   | Opt_GeneralizedNewtypeDeriving
Ian Lynagh's avatar
Ian Lynagh committed
249
   | Opt_RecursiveDo
250
   | Opt_PostfixOperators
Ian Lynagh's avatar
Ian Lynagh committed
251
   | Opt_PatternGuards
252
   | Opt_LiberalTypeSynonyms
253
254
   | Opt_Rank2Types
   | Opt_RankNTypes
255
   | Opt_ImpredicativeTypes
Ian Lynagh's avatar
Ian Lynagh committed
256
   | Opt_TypeOperators
257
   | Opt_PackageImports
258
   | Opt_NewQualifiedOperators
259

260
261
   | Opt_PrintExplicitForalls

262
263
264
   -- optimisation opts
   | Opt_Strictness
   | Opt_FullLaziness
265
   | Opt_StaticArgumentTransformation
266
   | Opt_CSE
267
268
   | Opt_LiberateCase
   | Opt_SpecConstr
269
270
271
272
273
274
275
   | Opt_IgnoreInterfacePragmas
   | Opt_OmitInterfacePragmas
   | Opt_DoLambdaEtaExpansion
   | Opt_IgnoreAsserts
   | Opt_DoEtaReduction
   | Opt_CaseMerge
   | Opt_UnboxStrictFields
276
   | Opt_MethodSharing
277
   | Opt_DictsCheap
278
   | Opt_InlineIfEnoughArgs
279
   | Opt_EnableRewriteRules		-- Apply rewrite rules during simplification
rl@cse.unsw.edu.au's avatar
rl@cse.unsw.edu.au committed
280
   | Opt_Vectorise
Ian Lynagh's avatar
Ian Lynagh committed
281
282
   | Opt_RegsGraph                      -- do graph coloring register allocation
   | Opt_RegsIterative                  -- do iterative coalescing graph coloring register allocation
283

Ian Lynagh's avatar
Ian Lynagh committed
284
285
286
287
288
   -- profiling opts
   | Opt_AutoSccsOnAllToplevs
   | Opt_AutoSccsOnExportedToplevs
   | Opt_AutoSccsOnIndividualCafs

289
290
291
   -- misc opts
   | Opt_Cpp
   | Opt_Pp
292
   | Opt_ForceRecomp
293
294
295
   | Opt_DryRun
   | Opt_DoAsmMangling
   | Opt_ExcessPrecision
296
   | Opt_EagerBlackHoling
297
298
299
300
   | Opt_ReadUserPackageConf
   | Opt_NoHsMain
   | Opt_SplitObjs
   | Opt_StgStats
301
   | Opt_HideAllPackages
302
   | Opt_PrintBindResult
303
   | Opt_Haddock
David Waern's avatar
David Waern committed
304
   | Opt_HaddockOptions
305
   | Opt_Hpc_No_Auto
306
   | Opt_BreakOnException
307
   | Opt_BreakOnError
308
   | Opt_PrintEvldWithShow
309
   | Opt_PrintBindContents
310
311
   | Opt_GenManifest
   | Opt_EmbedManifest
312
   | Opt_EmitExternalCore
Ian Lynagh's avatar
Ian Lynagh committed
313
   | Opt_SharedImplib
314
315
316

	-- temporary flags
   | Opt_RunCPS
317
318
   | Opt_RunCPSZ
   | Opt_ConvertToZipCfgAndBack
319
   | Opt_AutoLinkPackages
320
   | Opt_ImplicitImportQualified
321
   | Opt_TryNewCodeGen
322
323
324
325
326
327
328

   -- keeping stuff
   | Opt_KeepHiDiffs
   | Opt_KeepHcFiles
   | Opt_KeepSFiles
   | Opt_KeepRawSFiles
   | Opt_KeepTmpFiles
Jedai's avatar
Jedai committed
329
   | Opt_KeepRawTokenStream
330

331
   deriving (Eq, Show)
Ian Lynagh's avatar
Ian Lynagh committed
332

333
334
-- | Contains not only a collection of 'DynFlag's but also a plethora of
-- information relating to the compilation of a single file or GHC session
335
data DynFlags = DynFlags {
Ian Lynagh's avatar
Ian Lynagh committed
336
337
338
339
340
  ghcMode               :: GhcMode,
  ghcLink               :: GhcLink,
  coreToDo              :: Maybe [CoreToDo], -- reserved for -Ofile
  stgToDo               :: Maybe [StgToDo],  -- similarly
  hscTarget             :: HscTarget,
341
  hscOutName            :: String,      -- ^ Name of the output file
342
  extCoreName           :: String,      -- ^ Name of the .hcr output file
343
344
345
346
  verbosity             :: Int,         -- ^ Verbosity level: see "DynFlags#verbosity_levels"
  optLevel              :: Int,         -- ^ Optimisation level
  simplPhases           :: Int,         -- ^ Number of simplifier phases
  maxSimplIterations    :: Int,         -- ^ Max simplifier iterations
347
  shouldDumpSimplPhase  :: SimplifierMode -> Bool,
Ian Lynagh's avatar
Ian Lynagh committed
348
  ruleCheck             :: Maybe String,
349

350
351
352
  specConstrThreshold   :: Maybe Int,   -- ^ Threshold for SpecConstr
  specConstrCount       :: Maybe Int,   -- ^ Max number of specialisations for any one function
  liberateCaseThreshold :: Maybe Int,   -- ^ Threshold for LiberateCase
353

354
#ifndef OMIT_NATIVE_CODEGEN
355
  targetPlatform	:: Platform,	-- ^ The platform we're compiling for. Used by the NCG.
356
#endif
Ian Lynagh's avatar
Ian Lynagh committed
357
  stolen_x86_regs       :: Int,
358
  cmdlineHcIncludes     :: [String],    -- ^ @\-\#includes@
Ian Lynagh's avatar
Ian Lynagh committed
359
360
361
  importPaths           :: [FilePath],
  mainModIs             :: Module,
  mainFunIs             :: Maybe String,
362
  ctxtStkDepth          :: Int,         -- ^ Typechecker context stack depth
363

364
365
  dphBackend            :: DPHBackend,

366
  thisPackage           :: PackageId,   -- ^ name of package currently being compiled
367
368

  -- ways
369
370
371
  wayNames              :: [WayName],   -- ^ Way flags from the command line
  buildTag              :: String,      -- ^ The global \"way\" (e.g. \"p\" for prof)
  rtsBuildTag           :: String,      -- ^ The RTS \"way\"
Ian Lynagh's avatar
Ian Lynagh committed
372

373
374
375
  -- For object splitting
  splitInfo             :: Maybe (String,Int),

376
  -- paths etc.
Ian Lynagh's avatar
Ian Lynagh committed
377
378
379
  objectDir             :: Maybe String,
  hiDir                 :: Maybe String,
  stubDir               :: Maybe String,
380

Ian Lynagh's avatar
Ian Lynagh committed
381
382
383
  objectSuf             :: String,
  hcSuf                 :: String,
  hiSuf                 :: String,
384

Ian Lynagh's avatar
Ian Lynagh committed
385
386
387
  outputFile            :: Maybe String,
  outputHi              :: Maybe String,
  dynLibLoader          :: DynLibLoader,
388

389
  -- | This is set by 'DriverPipeline.runPipeline' based on where
Ian Lynagh's avatar
Ian Lynagh committed
390
391
  --    its output is going.
  dumpPrefix            :: Maybe FilePath,
392

393
394
  -- | Override the 'dumpPrefix' set by 'DriverPipeline.runPipeline'.
  --    Set by @-ddump-file-prefix@
Ian Lynagh's avatar
Ian Lynagh committed
395
396
397
398
399
400
401
402
  dumpPrefixForce       :: Maybe FilePath,

  includePaths          :: [String],
  libraryPaths          :: [String],
  frameworkPaths        :: [String],    -- used on darwin only
  cmdlineFrameworks     :: [String],    -- ditto
  tmpDir                :: String,      -- no trailing '/'

403
404
405
  ghcUsagePath          :: FilePath,    -- Filled in by SysTools
  ghciUsagePath         :: FilePath,    -- ditto

406
  hpcDir                :: String,      -- ^ Path to store the .mix files
andy@galois.com's avatar
andy@galois.com committed
407

408
  -- options for particular phases
Ian Lynagh's avatar
Ian Lynagh committed
409
410
411
412
413
414
415
416
  opt_L                 :: [String],
  opt_P                 :: [String],
  opt_F                 :: [String],
  opt_c                 :: [String],
  opt_m                 :: [String],
  opt_a                 :: [String],
  opt_l                 :: [String],
  opt_windres           :: [String],
417
418

  -- commands for particular phases
Ian Lynagh's avatar
Ian Lynagh committed
419
420
421
422
423
424
425
426
427
  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]),
428
429
  pgm_T                 :: String,
  pgm_sysman            :: String,
430
  pgm_windres           :: String,
431

432
433
434
435
436
437
  --  For ghc -M
  depMakefile           :: FilePath,
  depIncludePkgDeps     :: Bool,
  depExcludeMods        :: [ModuleName],
  depSuffixes           :: [String],

438
  --  Package flags
Ian Lynagh's avatar
Ian Lynagh committed
439
  extraPkgConfs         :: [FilePath],
440
441
  topDir                :: FilePath,    -- filled in by SysTools
  systemPackageConfig   :: FilePath,    -- ditto
442
        -- ^ The @-package-conf@ flags given on the command line, in the order
Ian Lynagh's avatar
Ian Lynagh committed
443
        -- they appeared.
444

Ian Lynagh's avatar
Ian Lynagh committed
445
  packageFlags          :: [PackageFlag],
446
        -- ^ The @-package@ and @-hide-package@ flags from the command-line
447

448
  -- Package state
Ian Lynagh's avatar
Ian Lynagh committed
449
  -- NB. do not modify this field, it is calculated by
450
  -- Packages.initPackages and Packages.updatePackages.
451
  pkgDatabase           :: Maybe (UniqFM PackageConfig),
Ian Lynagh's avatar
Ian Lynagh committed
452
  pkgState              :: PackageState,
453

454
455
456
457
458
459
  -- Temporary files
  -- These have to be IORefs, because the defaultCleanupHandler needs to
  -- know what to clean when an exception happens
  filesToClean          :: IORef [FilePath],
  dirsToClean           :: IORef (FiniteMap FilePath FilePath),

460
  -- hsc dynamic flags
Ian Lynagh's avatar
Ian Lynagh committed
461
462
  flags                 :: [DynFlag],

463
  -- | Message output action: use "ErrUtils" instead of this if you can
David Waern's avatar
David Waern committed
464
465
466
  log_action            :: Severity -> SrcSpan -> PprStyle -> Message -> IO (),

  haddockOptions :: Maybe String
467
468
 }

469
470
-- | The target code type of the compilation (if any).
--
471
472
473
-- Whenever you change the target, also make sure to set 'ghcLink' to
-- something sensible.
--
474
475
476
477
-- 'HscNothing' can be used to avoid generating any output, however, note
-- that:
--
--  * This will not run the desugaring step, thus no warnings generated in
478
479
480
--    this step will be output.  In particular, this includes warnings related
--    to pattern matching.  You can run the desugarer manually using
--    'GHC.desugarModule'.
481
--
482
483
484
485
486
487
--  * If a program uses Template Haskell the typechecker may try to run code
--    from an imported module.  This will fail if no code has been generated
--    for this module.  You can use 'GHC.needsTemplateHaskell' to detect
--    whether this might be the case and choose to either switch to a
--    different target or avoid typechecking such modules.  (The latter may
--    preferable for security reasons.)
488
--
489
data HscTarget
490
491
492
493
494
  = HscC           -- ^ Generate C code.
  | HscAsm         -- ^ Generate assembly using the native code generator.
  | HscJava        -- ^ Generate Java bytecode.
  | HscInterpreted -- ^ Generate bytecode.  (Requires 'LinkInMemory')
  | HscNothing     -- ^ Don't generate any code.  See notes above.
495
496
  deriving (Eq, Show)

497
-- | Will this target result in an object file on the disk?
498
499
500
501
502
503
504
505
506
507
508
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.
509
data GhcMode
510
511
512
  = CompManager         -- ^ @\-\-make@, GHCi, etc.
  | OneShot             -- ^ @ghc -c Foo.hs@
  | MkDepend            -- ^ @ghc -M@, see "Finder" for why we need this
513
514
  deriving Eq

515
516
517
518
519
instance Outputable GhcMode where
  ppr CompManager = ptext (sLit "CompManager")
  ppr OneShot     = ptext (sLit "OneShot")
  ppr MkDepend    = ptext (sLit "MkDepend")

520
521
522
523
isOneShot :: GhcMode -> Bool
isOneShot OneShot = True
isOneShot _other  = False

524
525
526
527
-- | What to do in the link step, if there is one.
data GhcLink
  = NoLink              -- ^ Don't link at all
  | LinkBinary          -- ^ Link object code into a binary
528
529
  | LinkInMemory        -- ^ Use the in-memory dynamic linker (works for both
                        --   bytecode and object code).
530
  | LinkDynLib          -- ^ Link objects into a dynamic lib (DLL on Windows, DSO on ELF platforms)
531
  deriving (Eq, Show)
532
533
534

isNoLink :: GhcLink -> Bool
isNoLink NoLink = True
twanvl's avatar
twanvl committed
535
isNoLink _      = False
536

537
538
539
540
541
-- Is it worth evaluating this Bool and caching it in the DynFlags value
-- during initDynFlags?
doingTickyProfiling :: DynFlags -> Bool
doingTickyProfiling dflags = WayTicky `elem` wayNames dflags

542
543
544
545
data PackageFlag
  = ExposePackage  String
  | HidePackage    String
  | IgnorePackage  String
546
  deriving Eq
547

twanvl's avatar
twanvl committed
548
defaultHscTarget :: HscTarget
549
550
defaultHscTarget = defaultObjectTarget

551
-- | The 'HscTarget' value corresponding to the default way to create
552
-- object files on the current platform.
twanvl's avatar
twanvl committed
553
defaultObjectTarget :: HscTarget
554
defaultObjectTarget
Ian Lynagh's avatar
Ian Lynagh committed
555
556
  | cGhcWithNativeCodeGen == "YES"      =  HscAsm
  | otherwise                           =  HscC
557

558
559
560
561
562
563
data DynLibLoader
  = Deployable
  | Wrapped (Maybe String)
  | SystemDependent
  deriving Eq

564
-- | Used by 'GHC.newSession' to partially initialize a new 'DynFlags' value
twanvl's avatar
twanvl committed
565
initDynFlags :: DynFlags -> IO DynFlags
566
567
568
569
570
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
571
572
 refFilesToClean <- newIORef []
 refDirsToClean <- newIORef emptyFM
573
 return dflags{
Ian Lynagh's avatar
Ian Lynagh committed
574
575
        wayNames        = ways,
        buildTag        = build_tag,
576
577
578
        rtsBuildTag     = rts_build_tag,
        filesToClean    = refFilesToClean,
        dirsToClean     = refDirsToClean
Ian Lynagh's avatar
Ian Lynagh committed
579
        }
580

581
582
-- | The normal 'DynFlags'. Note that they is not suitable for use in this form
-- and must be fully initialized by 'GHC.newSession' first.
twanvl's avatar
twanvl committed
583
defaultDynFlags :: DynFlags
584
585
defaultDynFlags =
     DynFlags {
Ian Lynagh's avatar
Ian Lynagh committed
586
587
588
589
590
591
592
593
594
        ghcMode                 = CompManager,
        ghcLink                 = LinkBinary,
        coreToDo                = Nothing,
        stgToDo                 = Nothing,
        hscTarget               = defaultHscTarget,
        hscOutName              = "",
        extCoreName             = "",
        verbosity               = 0,
        optLevel                = 0,
595
        simplPhases             = 2,
Ian Lynagh's avatar
Ian Lynagh committed
596
        maxSimplIterations      = 4,
597
        shouldDumpSimplPhase    = const False,
Ian Lynagh's avatar
Ian Lynagh committed
598
599
600
        ruleCheck               = Nothing,
        specConstrThreshold     = Just 200,
        specConstrCount         = Just 3,
601
        liberateCaseThreshold   = Just 200,
602
#ifndef OMIT_NATIVE_CODEGEN
603
        targetPlatform          = defaultTargetPlatform,
604
#endif
Ian Lynagh's avatar
Ian Lynagh committed
605
606
607
608
609
610
611
        stolen_x86_regs         = 4,
        cmdlineHcIncludes       = [],
        importPaths             = ["."],
        mainModIs               = mAIN,
        mainFunIs               = Nothing,
        ctxtStkDepth            = mAX_CONTEXT_REDUCTION_DEPTH,

612
613
        dphBackend              = DPHPar,

Ian Lynagh's avatar
Ian Lynagh committed
614
615
616
617
618
619
620
621
622
623
624
625
        thisPackage             = mainPackageId,

        objectDir               = Nothing,
        hiDir                   = Nothing,
        stubDir                 = Nothing,

        objectSuf               = phaseInputExt StopLn,
        hcSuf                   = phaseInputExt HCc,
        hiSuf                   = "hi",

        outputFile              = Nothing,
        outputHi                = Nothing,
626
        dynLibLoader            = SystemDependent,
Ian Lynagh's avatar
Ian Lynagh committed
627
628
629
630
631
632
633
634
635
636
637
638
        dumpPrefix              = Nothing,
        dumpPrefixForce         = Nothing,
        includePaths            = [],
        libraryPaths            = [],
        frameworkPaths          = [],
        cmdlineFrameworks       = [],
        tmpDir                  = cDEFAULT_TMPDIR,

        hpcDir                  = ".hpc",

        opt_L                   = [],
        opt_P                   = (if opt_PIC
639
                                   then ["-D__PIC__", "-U __PIC__"] -- this list is reversed
Ian Lynagh's avatar
Ian Lynagh committed
640
641
642
643
644
645
                                   else []),
        opt_F                   = [],
        opt_c                   = [],
        opt_a                   = [],
        opt_m                   = [],
        opt_l                   = [],
646
        opt_windres             = [],
Ian Lynagh's avatar
Ian Lynagh committed
647
648
649

        extraPkgConfs           = [],
        packageFlags            = [],
650
651
        pkgDatabase             = Nothing,
        pkgState                = panic "no package state yet: call GHC.setSessionDynFlags",
Ian Lynagh's avatar
Ian Lynagh committed
652
653
654
        wayNames                = panic "defaultDynFlags: No wayNames",
        buildTag                = panic "defaultDynFlags: No buildTag",
        rtsBuildTag             = panic "defaultDynFlags: No rtsBuildTag",
655
        splitInfo               = Nothing,
Ian Lynagh's avatar
Ian Lynagh committed
656
657
658
659
        -- initSysTools fills all these in
        ghcUsagePath            = panic "defaultDynFlags: No ghciUsagePath",
        ghciUsagePath           = panic "defaultDynFlags: No ghciUsagePath",
        topDir                  = panic "defaultDynFlags: No topDir",
660
        systemPackageConfig     = panic  "no systemPackageConfig: call GHC.setSessionDynFlags",
Ian Lynagh's avatar
Ian Lynagh committed
661
662
663
664
665
666
667
668
669
670
671
672
673
        pgm_L                   = panic "defaultDynFlags: No pgm_L",
        pgm_P                   = panic "defaultDynFlags: No pgm_P",
        pgm_F                   = panic "defaultDynFlags: No pgm_F",
        pgm_c                   = panic "defaultDynFlags: No pgm_c",
        pgm_m                   = panic "defaultDynFlags: No pgm_m",
        pgm_s                   = panic "defaultDynFlags: No pgm_s",
        pgm_a                   = panic "defaultDynFlags: No pgm_a",
        pgm_l                   = panic "defaultDynFlags: No pgm_l",
        pgm_dll                 = panic "defaultDynFlags: No pgm_dll",
        pgm_T                   = panic "defaultDynFlags: No pgm_T",
        pgm_sysman              = panic "defaultDynFlags: No pgm_sysman",
        pgm_windres             = panic "defaultDynFlags: No pgm_windres",
        -- end of initSysTools values
674
675
676
677
678
679
        -- ghc -M values
        depMakefile       = "Makefile",
        depIncludePkgDeps = False,
        depExcludeMods    = [],
        depSuffixes       = [],
        -- end of ghc -M values
680
681
        filesToClean   = panic "defaultDynFlags: No filesToClean",
        dirsToClean    = panic "defaultDynFlags: No dirsToClean",
Ian Lynagh's avatar
Ian Lynagh committed
682
        haddockOptions = Nothing,
683
        flags = [
684
            Opt_AutoLinkPackages,
685
686
687
688
689
690
691
692
693
            Opt_ReadUserPackageConf,

            Opt_MonoPatBinds,   -- Experimentally, I'm making this non-standard
                                -- behaviour the default, to see if anyone notices
                                -- SLPJ July 06

            Opt_ImplicitPrelude,
            Opt_MonomorphismRestriction,

694
695
            Opt_MethodSharing,

696
697
            Opt_DoAsmMangling,

Ian Lynagh's avatar
Ian Lynagh committed
698
699
            Opt_SharedImplib,

700
            Opt_GenManifest,
701
702
            Opt_EmbedManifest,
            Opt_PrintBindContents
703
704
705
706
707
            ]
            ++ [f | (ns,f) <- optLevelFlags, 0 `elem` ns]
                    -- The default -O0 options
            ++ standardWarnings,

Ian Lynagh's avatar
Ian Lynagh committed
708
        log_action = \severity srcSpan style msg ->
709
                        case severity of
710
711
712
713
714
715
716
717
                          SevInfo  -> printErrs (msg style)
                          SevFatal -> printErrs (msg style)
                          _        -> do 
                                hPutChar stderr '\n'
                                printErrs ((mkLocMessage srcSpan msg) style)
                     -- careful (#2302): printErrs prints in UTF-8, whereas
                     -- converting to string first and using hPutStr would
                     -- just emit the low 8 bits of each unicode char.
718
719
      }

Ian Lynagh's avatar
Ian Lynagh committed
720
{-
721
    #verbosity_levels#
722
    Verbosity levels:
Ian Lynagh's avatar
Ian Lynagh committed
723
724

    0   |   print errors & warnings only
725
726
727
728
729
730
731
    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"
-}

732
-- | Test whether a 'DynFlag' is set
733
734
735
dopt :: DynFlag -> DynFlags -> Bool
dopt f dflags  = f `elem` (flags dflags)

736
-- | Set a 'DynFlag'
737
738
739
dopt_set :: DynFlags -> DynFlag -> DynFlags
dopt_set dfs f = dfs{ flags = f : flags dfs }

740
-- | Unset a 'DynFlag'
741
742
743
dopt_unset :: DynFlags -> DynFlag -> DynFlags
dopt_unset dfs f = dfs{ flags = filter (/= f) (flags dfs) }

744
745
746
747
-- | Retrieve the options corresponding to a particular @opt_*@ field in the correct order
getOpts :: DynFlags             -- ^ 'DynFlags' to retrieve the options from
        -> (DynFlags -> [a])    -- ^ Relevant record accessor: one of the @opt_*@ accessors
        -> [a]                  -- ^ Correctly ordered extracted options
748
getOpts dflags opts = reverse (opts dflags)
Ian Lynagh's avatar
Ian Lynagh committed
749
        -- We add to the options from the front, so we need to reverse the list
750

751
752
-- | Gets the verbosity flag for the current verbosity level. This is fed to
-- other tools, so GHC-specific verbosity flags like @-ddump-most@ are not included
753
getVerbFlag :: DynFlags -> String
Ian Lynagh's avatar
Ian Lynagh committed
754
755
getVerbFlag dflags
  | verbosity dflags >= 3  = "-v"
756
757
  | otherwise =  ""

Simon Marlow's avatar
Simon Marlow committed
758
759
setObjectDir, setHiDir, setStubDir, setOutputDir,
         setObjectSuf, setHiSuf, setHcSuf, parseDynLibLoaderMode,
twanvl's avatar
twanvl committed
760
         setPgmP, setPgmL, setPgmF, setPgmc, setPgmm, setPgms, setPgma, setPgml, setPgmdll, setPgmwindres,
761
         addOptL, addOptP, addOptF, addOptc, addOptm, addOpta, addOptl, addOptwindres,
twanvl's avatar
twanvl committed
762
763
764
765
766
         addCmdlineFramework, addHaddockOpts
   :: String -> DynFlags -> DynFlags
setOutputFile, setOutputHi, setDumpPrefixForce
   :: Maybe String -> DynFlags -> DynFlags

767
768
769
770
setObjectDir  f d = d{ objectDir  = Just f}
setHiDir      f d = d{ hiDir      = Just f}
setStubDir    f d = d{ stubDir    = Just f, includePaths = f : includePaths d }
  -- -stubdir D adds an implicit -I D, so that gcc can find the _stub.h file
Thomas Schilling's avatar
Thomas Schilling committed
771
  -- \#included from the .hc file when compiling with -fvia-C.
Simon Marlow's avatar
Simon Marlow committed
772
setOutputDir  f = setObjectDir f . setHiDir f . setStubDir f
773

774
775
setObjectSuf  f d = d{ objectSuf  = f}
setHiSuf      f d = d{ hiSuf      = f}
776
777
778
779
setHcSuf      f d = d{ hcSuf      = f}

setOutputFile f d = d{ outputFile = f}
setOutputHi   f d = d{ outputHi   = f}
780

781
782
783
784
785
786
787
parseDynLibLoaderMode f d =
 case splitAt 8 f of
   ("deploy", "")       -> d{ dynLibLoader = Deployable }
   ("sysdep", "")       -> d{ dynLibLoader = SystemDependent }
   ("wrapped", "")      -> d{ dynLibLoader = Wrapped Nothing }
   ("wrapped:", "hard") -> d{ dynLibLoader = Wrapped Nothing }
   ("wrapped:", flex)   -> d{ dynLibLoader = Wrapped (Just flex) }
788
   _                    -> ghcError (CmdLineError ("Unknown dynlib loader: " ++ f))
789

790
791
setDumpPrefixForce f d = d { dumpPrefixForce = f}

792
793
794
795
796
797
798
799
800
801
802
803
-- 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,[])}
804
setPgmwindres f d = d{ pgm_windres = f}
805
806
807
808
809
810
811
812

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}
813
addOptwindres f d = d{ opt_windres = f : opt_windres d}
814

815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
setDepMakefile :: FilePath -> DynFlags -> DynFlags
setDepMakefile f d = d { depMakefile = deOptDep f }

setDepIncludePkgDeps :: Bool -> DynFlags -> DynFlags
setDepIncludePkgDeps b d = d { depIncludePkgDeps = b }

addDepExcludeMod :: String -> DynFlags -> DynFlags
addDepExcludeMod m d
    = d { depExcludeMods = mkModuleName (deOptDep m) : depExcludeMods d }

addDepSuffix :: FilePath -> DynFlags -> DynFlags
addDepSuffix s d = d { depSuffixes = deOptDep s : depSuffixes d }

-- XXX Legacy code:
-- We used to use "-optdep-flag -optdeparg", so for legacy applications
-- we need to strip the "-optdep" off of the arg
deOptDep :: String -> String
832
deOptDep x = case stripPrefix "-optdep" x of
833
834
835
             Just rest -> rest
             Nothing -> x

836
837
addCmdlineFramework f d = d{ cmdlineFrameworks = f : cmdlineFrameworks d}

David Waern's avatar
David Waern committed
838
839
addHaddockOpts f d = d{ haddockOptions = Just f}

840
841
842
-- -----------------------------------------------------------------------------
-- Command-line options

843
-- | When invoking external tools as part of the compilation pipeline, we
844
845
-- 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
846
-- between filepaths and 'other stuff'. The reason for this is that
847
-- this type gives us a handle on transforming filenames, and filenames only,
848
-- to whatever format they're expected to be on a particular platform.
849
850
data Option
 = FileOption -- an entry that _contains_ filename(s) / filepaths.
Ian Lynagh's avatar
Ian Lynagh committed
851
852
853
              String  -- a non-filepath prefix that shouldn't be
                      -- transformed (e.g., "/out=")
              String  -- the filepath/filename portion
854
 | Option     String
Ian Lynagh's avatar
Ian Lynagh committed
855

856
857
858
859
-----------------------------------------------------------------------------
-- Setting the optimisation level

updOptLevel :: Int -> DynFlags -> DynFlags
860
-- ^ Sets the 'DynFlags' to be appropriate to the optimisation level
861
updOptLevel n dfs
862
  = dfs2{ optLevel = final_n }
863
  where
Ian Lynagh's avatar
Ian Lynagh committed
864
   final_n = max 0 (min 2 n)    -- Clamp to 0 <= n <= 2
865
866
867
   dfs1 = foldr (flip dopt_unset) dfs  remove_dopts
   dfs2 = foldr (flip dopt_set)   dfs1 extra_dopts

868
869
   extra_dopts  = [ f | (ns,f) <- optLevelFlags, final_n `elem` ns ]
   remove_dopts = [ f | (ns,f) <- optLevelFlags, final_n `notElem` ns ]
Ian Lynagh's avatar
Ian Lynagh committed
870

871
872
optLevelFlags :: [([Int], DynFlag)]
optLevelFlags
Ian Lynagh's avatar
Ian Lynagh committed
873
  = [ ([0],     Opt_IgnoreInterfacePragmas)
874
    , ([0],     Opt_OmitInterfacePragmas)
875

Ian Lynagh's avatar
Ian Lynagh committed
876
    , ([1,2],   Opt_IgnoreAsserts)
877
878
    , ([1,2],   Opt_EnableRewriteRules)  -- Off for -O0; see Note [Scoping for Builtin rules]
                                         --              in PrelRules
Ian Lynagh's avatar
Ian Lynagh committed
879
880
881
882
883
    , ([1,2],   Opt_DoEtaReduction)
    , ([1,2],   Opt_CaseMerge)
    , ([1,2],   Opt_Strictness)
    , ([1,2],   Opt_CSE)
    , ([1,2],   Opt_FullLaziness)
884

Ian Lynagh's avatar
Ian Lynagh committed
885
886
    , ([2],     Opt_LiberateCase)
    , ([2],     Opt_SpecConstr)
887
888
889
890
891
892
893
894
895
896

--     , ([2],     Opt_StaticArgumentTransformation)
-- Max writes: I think it's probably best not to enable SAT with -O2 for the
-- 6.10 release. The version of SAT in HEAD at the moment doesn't incorporate
-- several improvements to the heuristics, and I'm concerned that without
-- those changes SAT will interfere with some attempts to write "high
-- performance Haskell", as we saw in some posts on Haskell-Cafe earlier
-- this year. In particular, the version in HEAD lacks the tail call
-- criterion, so many things that look like reasonable loops will be
-- turned into functions with extra (unneccesary) thunk creation.
897
898

    , ([0,1,2], Opt_DoLambdaEtaExpansion)
Ian Lynagh's avatar
Ian Lynagh committed
899
900
901
902
                -- 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.
903
904
905
906
907
    ]

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

twanvl's avatar
twanvl committed
908
standardWarnings :: [DynFlag]
909
standardWarnings
Ian Lynagh's avatar
Ian Lynagh committed
910
    = [ Opt_WarnWarningsDeprecations,
911
        Opt_WarnDeprecatedFlags,
912
        Opt_WarnUnrecognisedPragmas,
Ian Lynagh's avatar
Ian Lynagh committed
913
914
915
        Opt_WarnOverlappingPatterns,
        Opt_WarnMissingFields,
        Opt_WarnMissingMethods,
916
        Opt_WarnDuplicateExports,
917
        Opt_WarnLazyUnliftedBindings,
918
919
        Opt_WarnDodgyForeignImports,
        Opt_WarnWrongDoBind
920
921
      ]

twanvl's avatar
twanvl committed
922
minusWOpts :: [DynFlag]
923
minusWOpts
Ian Lynagh's avatar
Ian Lynagh committed
924
925
926
927
928
929
    = standardWarnings ++
      [ Opt_WarnUnusedBinds,
        Opt_WarnUnusedMatches,
        Opt_WarnUnusedImports,
        Opt_WarnIncompletePatterns,
        Opt_WarnDodgyImports
930
931
      ]

twanvl's avatar
twanvl committed
932
minusWallOpts :: [DynFlag]
933
934
minusWallOpts
    = minusWOpts ++
Ian Lynagh's avatar
Ian Lynagh committed
935
936
937
938
      [ Opt_WarnTypeDefaults,
        Opt_WarnNameShadowing,
        Opt_WarnMissingSigs,
        Opt_WarnHiShadows,
939
940
        Opt_WarnOrphans,
        Opt_WarnUnusedDoBind
941
942
      ]

943
-- minuswRemovesOpts should be every warning option
twanvl's avatar
twanvl committed
944
minuswRemovesOpts :: [DynFlag]
945
946
947
948
949
950
minuswRemovesOpts
    = minusWallOpts ++
      [Opt_WarnImplicitPrelude,
       Opt_WarnIncompletePatternsRecUpd,
       Opt_WarnSimplePatterns,
       Opt_WarnMonomorphism,
951
       Opt_WarnUnrecognisedPragmas,
952
953
954
       Opt_WarnTabs
      ]

955
956
957
-- -----------------------------------------------------------------------------
-- CoreToDo:  abstraction of core-to-core passes to run.

Ian Lynagh's avatar
Ian Lynagh committed
958
959
960
data CoreToDo           -- These are diff core-to-core passes,
                        -- which may be invoked in any order,
                        -- as many times as you like.
961

Ian Lynagh's avatar
Ian Lynagh committed
962
963
964
965
966
  = CoreDoSimplify      -- The core-to-core simplifier.
        SimplifierMode
        [SimplifierSwitch]
                        -- Each run of the simplifier can take a different
                        -- set of simplifier-specific flags.
967
968
969
970
971
972
973
974
975
976
977
978
  | CoreDoFloatInwards
  | CoreDoFloatOutwards FloatOutSwitches
  | CoreLiberateCase
  | CoreDoPrintCore
  | CoreDoStaticArgs
  | CoreDoStrictness
  | CoreDoWorkerWrapper
  | CoreDoSpecialising
  | CoreDoSpecConstr
  | CoreDoOldStrictness
  | CoreDoGlomBinds
  | CoreCSE
Ian Lynagh's avatar
Ian Lynagh committed
979
980
  | CoreDoRuleCheck Int{-CompilerPhase-} String -- Check for non-application of rules
                                                -- matching this string
981
  | CoreDoVectorisation PackageId
Ian Lynagh's avatar
Ian Lynagh committed
982
983
  | CoreDoNothing                -- Useful when building up
  | CoreDoPasses [CoreToDo]      -- lists of these things
984

985

Ian Lynagh's avatar
Ian Lynagh committed
986
data SimplifierMode             -- See comments in SimplMonad
987
  = SimplGently
988
  | SimplPhase Int [String]
989

990
991
992
993
994
instance Outputable SimplifierMode where
    ppr SimplGently       = ptext (sLit "gentle")
    ppr (SimplPhase n ss) = int n <+> brackets (text (concat $ intersperse "," ss))


995
996
997
998
data SimplifierSwitch
  = MaxSimplifierIterations Int
  | NoCaseOfCase