DynFlags.hs 96.3 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
        DynFlag(..),
        DynFlags(..),
        HscTarget(..), isObjectTarget, defaultObjectTarget,
        GhcMode(..), isOneShot,
        GhcLink(..), isNoLink,
        PackageFlag(..),
Ian Lynagh's avatar
Ian Lynagh committed
20
        Option(..), showOpt,
Ian Lynagh's avatar
Ian Lynagh committed
21
        DynLibLoader(..),
22
        fFlags, xFlags,
23
        dphPackage,
24
        wayNames,
25

26
        -- ** Manipulating DynFlags
Ian Lynagh's avatar
Ian Lynagh committed
27
28
29
30
31
        defaultDynFlags,                -- DynFlags
        initDynFlags,                   -- DynFlags -> IO DynFlags

        dopt,                           -- DynFlag -> DynFlags -> Bool
        dopt_set, dopt_unset,           -- DynFlags -> DynFlag -> DynFlags
32
        getOpts,                        -- DynFlags -> (DynFlags -> [a]) -> [a]
Ian Lynagh's avatar
Ian Lynagh committed
33
34
35
36
        getVerbFlag,
        updOptLevel,
        setTmpDir,
        setPackageName,
37
        doingTickyProfiling,
Ian Lynagh's avatar
Ian Lynagh committed
38

39
        -- ** Parsing DynFlags
Ian Lynagh's avatar
Ian Lynagh committed
40
        parseDynamicFlags,
41
        parseDynamicNoPackageFlags,
42
        allFlags,
43

44
45
46
        supportedLanguages, languageOptions,

        -- ** DynFlag C compiler options
Ian Lynagh's avatar
Ian Lynagh committed
47
        machdepCCOpts, picCCOpts,
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
61
        Printable(..),
62
        compilerInfo
63
64
65
66
  ) where

#include "HsVersions.h"

67
#ifndef OMIT_NATIVE_CODEGEN
68
import Platform
69
#endif
70
import Module
Simon Marlow's avatar
Simon Marlow committed
71
import PackageConfig
72
import PrelNames        ( mAIN )
73
import StaticFlags
74
import {-# SOURCE #-} Packages (PackageState)
Ian Lynagh's avatar
Ian Lynagh committed
75
import DriverPhases     ( Phase(..), phaseInputExt )
76
77
import Config
import CmdLineParser
Ian Lynagh's avatar
Ian Lynagh committed
78
import Constants        ( mAX_CONTEXT_REDUCTION_DEPTH )
79
import Panic
80
import Util
81
import Maybes           ( orElse )
82
import SrcLoc
83
import FastString
84
import FiniteMap
Simon Marlow's avatar
Simon Marlow committed
85
86
import Outputable
import {-# SOURCE #-} ErrUtils ( Severity(..), Message, mkLocMessage )
87

88
import Data.IORef
Ian Lynagh's avatar
Ian Lynagh committed
89
import Control.Monad    ( when )
simonpj@microsoft.com's avatar
simonpj@microsoft.com committed
90

91
import Data.Char
92
import Data.List
Ian Lynagh's avatar
Ian Lynagh committed
93
import System.FilePath
94
import System.IO        ( stderr, hPutChar )
95

96
97
98
-- -----------------------------------------------------------------------------
-- DynFlags

99
-- | Enumerates the simple on-or-off dynamic flags
100
101
102
103
data DynFlag

   -- debugging flags
   = Opt_D_dump_cmm
104
   | Opt_D_dump_cmmz
105
   | Opt_D_dump_cmmz_pretty
106
   | Opt_D_dump_cps_cmm
107
   | Opt_D_dump_cvt_cmm
108
   | Opt_D_dump_asm
109
110
   | Opt_D_dump_asm_native
   | Opt_D_dump_asm_liveness
111
   | Opt_D_dump_asm_coalesce
112
113
114
   | Opt_D_dump_asm_regalloc
   | Opt_D_dump_asm_regalloc_stages
   | Opt_D_dump_asm_conflicts
115
   | Opt_D_dump_asm_stats
116
   | Opt_D_dump_asm_expanded
117
118
119
120
121
122
   | Opt_D_dump_cpranal
   | Opt_D_dump_deriv
   | Opt_D_dump_ds
   | Opt_D_dump_flatC
   | Opt_D_dump_foreign
   | Opt_D_dump_inlinings
123
   | Opt_D_dump_rule_firings
124
125
126
127
128
   | Opt_D_dump_occur_anal
   | Opt_D_dump_parsed
   | Opt_D_dump_rn
   | Opt_D_dump_simpl
   | Opt_D_dump_simpl_iterations
129
   | Opt_D_dump_simpl_phases
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
   | 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
148
   | Opt_D_dump_hpc
pepe's avatar
pepe committed
149
   | Opt_D_dump_rtti
150
151
152
153
154
155
   | 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
156
   | Opt_D_dump_mod_cycles
157
   | Opt_D_dump_view_pattern_commoning
158
   | Opt_D_faststring_stats
Ian Lynagh's avatar
Ian Lynagh committed
159
   | Opt_DumpToFile                     -- ^ Append dump output to files instead of stdout.
Simon Marlow's avatar
Simon Marlow committed
160
   | Opt_D_no_debug_output
161
162
163
   | Opt_DoCoreLinting
   | Opt_DoStgLinting
   | Opt_DoCmmLinting
Ben.Lippmeier@anu.edu.au's avatar
Ben.Lippmeier@anu.edu.au committed
164
   | Opt_DoAsmLinting
165

Ian Lynagh's avatar
Ian Lynagh committed
166
   | Opt_WarnIsError                    -- -Werror; makes warnings fatal
167
168
   | Opt_WarnDuplicateExports
   | Opt_WarnHiShadows
169
   | Opt_WarnImplicitPrelude
170
171
172
173
174
175
176
177
178
   | Opt_WarnIncompletePatterns
   | Opt_WarnIncompletePatternsRecUpd
   | Opt_WarnMissingFields
   | Opt_WarnMissingMethods
   | Opt_WarnMissingSigs
   | Opt_WarnNameShadowing
   | Opt_WarnOverlappingPatterns
   | Opt_WarnSimplePatterns
   | Opt_WarnTypeDefaults
179
   | Opt_WarnMonomorphism
180
181
182
   | Opt_WarnUnusedBinds
   | Opt_WarnUnusedImports
   | Opt_WarnUnusedMatches
Ian Lynagh's avatar
Ian Lynagh committed
183
   | Opt_WarnWarningsDeprecations
184
   | Opt_WarnDeprecatedFlags
185
   | Opt_WarnDodgyExports
186
187
   | Opt_WarnDodgyImports
   | Opt_WarnOrphans
188
   | Opt_WarnTabs
189
   | Opt_WarnUnrecognisedPragmas
190
   | Opt_WarnDodgyForeignImports
191
   | Opt_WarnLazyUnliftedBindings
192
193
194
   | Opt_WarnUnusedDoBind
   | Opt_WarnWrongDoBind

195
196

   -- language opts
197
198
199
   | Opt_OverlappingInstances
   | Opt_UndecidableInstances
   | Opt_IncoherentInstances
200
   | Opt_MonomorphismRestriction
201
   | Opt_MonoPatBinds
202
   | Opt_MonoLocalBinds
Ian Lynagh's avatar
Ian Lynagh committed
203
   | Opt_ExtendedDefaultRules           -- Use GHC's extended rules for defaulting
204
   | Opt_ForeignFunctionInterface
Ian Lynagh's avatar
Ian Lynagh committed
205
   | Opt_UnliftedFFITypes
206
   | Opt_GHCForeignImportPrim
Ian Lynagh's avatar
Ian Lynagh committed
207
208
   | Opt_PArr                           -- Syntactic support for parallel arrays
   | Opt_Arrows                         -- Arrow-notation syntax
209
   | Opt_TemplateHaskell
210
   | Opt_QuasiQuotes
211
   | Opt_ImplicitParams
212
   | Opt_Generics			-- "Derivable type classes"
Ian Lynagh's avatar
Ian Lynagh committed
213
   | Opt_ImplicitPrelude
214
   | Opt_ScopedTypeVariables
Ian Lynagh's avatar
Ian Lynagh committed
215
   | Opt_UnboxedTuples
simonpj@microsoft.com's avatar
simonpj@microsoft.com committed
216
   | Opt_BangPatterns
217
   | Opt_TypeFamilies
218
   | Opt_OverloadedStrings
219
   | Opt_DisambiguateRecordFields
220
   | Opt_RecordWildCards
221
   | Opt_RecordPuns
222
   | Opt_ViewPatterns
223
   | Opt_GADTs
224
   | Opt_RelaxedPolyRec
225
   | Opt_NPlusKPatterns
226

227
   | Opt_StandaloneDeriving
228
   | Opt_DeriveDataTypeable
229
   | Opt_DeriveFunctor
230
231
232
   | Opt_DeriveTraversable
   | Opt_DeriveFoldable

233
   | Opt_TypeSynonymInstances
Ian Lynagh's avatar
Ian Lynagh committed
234
   | Opt_FlexibleContexts
235
   | Opt_FlexibleInstances
236
   | Opt_ConstrainedClassMethods
Ian Lynagh's avatar
Ian Lynagh committed
237
   | Opt_MultiParamTypeClasses
238
   | Opt_FunctionalDependencies
Ian Lynagh's avatar
Ian Lynagh committed
239
   | Opt_UnicodeSyntax
Ian Lynagh's avatar
Ian Lynagh committed
240
   | Opt_PolymorphicComponents
241
   | Opt_ExistentialQuantification
242
   | Opt_MagicHash
Ian Lynagh's avatar
Ian Lynagh committed
243
   | Opt_EmptyDataDecls
Ian Lynagh's avatar
Ian Lynagh committed
244
   | Opt_KindSignatures
Ian Lynagh's avatar
Ian Lynagh committed
245
   | Opt_ParallelListComp
246
   | Opt_TransformListComp
247
   | Opt_GeneralizedNewtypeDeriving
Ian Lynagh's avatar
Ian Lynagh committed
248
   | Opt_RecursiveDo
249
   | Opt_PostfixOperators
250
   | Opt_TupleSections
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
   | Opt_ExplicitForAll
260

261
262
   | Opt_PrintExplicitForalls

263
264
265
   -- optimisation opts
   | Opt_Strictness
   | Opt_FullLaziness
266
   | Opt_StaticArgumentTransformation
267
   | Opt_CSE
268
269
   | Opt_LiberateCase
   | Opt_SpecConstr
270
271
272
273
274
275
276
   | Opt_IgnoreInterfacePragmas
   | Opt_OmitInterfacePragmas
   | Opt_DoLambdaEtaExpansion
   | Opt_IgnoreAsserts
   | Opt_DoEtaReduction
   | Opt_CaseMerge
   | Opt_UnboxStrictFields
277
   | Opt_MethodSharing
278
   | Opt_DictsCheap
279
   | Opt_InlineIfEnoughArgs
280
   | Opt_EnableRewriteRules		-- Apply rewrite rules during simplification
rl@cse.unsw.edu.au's avatar
rl@cse.unsw.edu.au committed
281
   | Opt_Vectorise
Ian Lynagh's avatar
Ian Lynagh committed
282
283
   | Opt_RegsGraph                      -- do graph coloring register allocation
   | Opt_RegsIterative                  -- do iterative coalescing graph coloring register allocation
284

Ian Lynagh's avatar
Ian Lynagh committed
285
286
287
288
289
   -- profiling opts
   | Opt_AutoSccsOnAllToplevs
   | Opt_AutoSccsOnExportedToplevs
   | Opt_AutoSccsOnIndividualCafs

290
291
292
   -- misc opts
   | Opt_Cpp
   | Opt_Pp
293
   | Opt_ForceRecomp
294
295
296
   | Opt_DryRun
   | Opt_DoAsmMangling
   | Opt_ExcessPrecision
297
   | Opt_EagerBlackHoling
298
299
300
301
   | Opt_ReadUserPackageConf
   | Opt_NoHsMain
   | Opt_SplitObjs
   | Opt_StgStats
302
   | Opt_HideAllPackages
303
   | Opt_PrintBindResult
304
   | Opt_Haddock
David Waern's avatar
David Waern committed
305
   | Opt_HaddockOptions
306
   | Opt_Hpc_No_Auto
307
   | Opt_BreakOnException
308
   | Opt_BreakOnError
309
   | Opt_PrintEvldWithShow
310
   | Opt_PrintBindContents
311
312
   | Opt_GenManifest
   | Opt_EmbedManifest
313
   | Opt_EmitExternalCore
Ian Lynagh's avatar
Ian Lynagh committed
314
   | Opt_SharedImplib
315
   | Opt_BuildingCabalPackage
316
317
318

	-- temporary flags
   | Opt_RunCPS
319
320
   | Opt_RunCPSZ
   | Opt_ConvertToZipCfgAndBack
321
   | Opt_AutoLinkPackages
322
   | Opt_ImplicitImportQualified
323
   | Opt_TryNewCodeGen
324
325
326
327
328
329
330

   -- keeping stuff
   | Opt_KeepHiDiffs
   | Opt_KeepHcFiles
   | Opt_KeepSFiles
   | Opt_KeepRawSFiles
   | Opt_KeepTmpFiles
Jedai's avatar
Jedai committed
331
   | Opt_KeepRawTokenStream
332

333
   deriving (Eq, Show)
Ian Lynagh's avatar
Ian Lynagh committed
334

335
336
-- | 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
337
data DynFlags = DynFlags {
Ian Lynagh's avatar
Ian Lynagh committed
338
339
340
341
342
  ghcMode               :: GhcMode,
  ghcLink               :: GhcLink,
  coreToDo              :: Maybe [CoreToDo], -- reserved for -Ofile
  stgToDo               :: Maybe [StgToDo],  -- similarly
  hscTarget             :: HscTarget,
343
  hscOutName            :: String,      -- ^ Name of the output file
344
  extCoreName           :: String,      -- ^ Name of the .hcr output file
345
346
347
348
  verbosity             :: Int,         -- ^ Verbosity level: see "DynFlags#verbosity_levels"
  optLevel              :: Int,         -- ^ Optimisation level
  simplPhases           :: Int,         -- ^ Number of simplifier phases
  maxSimplIterations    :: Int,         -- ^ Max simplifier iterations
349
  shouldDumpSimplPhase  :: SimplifierMode -> Bool,
Ian Lynagh's avatar
Ian Lynagh committed
350
  ruleCheck             :: Maybe String,
351

352
353
354
  specConstrThreshold   :: Maybe Int,   -- ^ Threshold for SpecConstr
  specConstrCount       :: Maybe Int,   -- ^ Max number of specialisations for any one function
  liberateCaseThreshold :: Maybe Int,   -- ^ Threshold for LiberateCase
355

356
#ifndef OMIT_NATIVE_CODEGEN
357
  targetPlatform	:: Platform,	-- ^ The platform we're compiling for. Used by the NCG.
358
#endif
Ian Lynagh's avatar
Ian Lynagh committed
359
  stolen_x86_regs       :: Int,
360
  cmdlineHcIncludes     :: [String],    -- ^ @\-\#includes@
Ian Lynagh's avatar
Ian Lynagh committed
361
362
363
  importPaths           :: [FilePath],
  mainModIs             :: Module,
  mainFunIs             :: Maybe String,
364
  ctxtStkDepth          :: Int,         -- ^ Typechecker context stack depth
365

366
367
  dphBackend            :: DPHBackend,

368
  thisPackage           :: PackageId,   -- ^ name of package currently being compiled
369
370

  -- ways
371
  ways                  :: [Way],       -- ^ Way flags from the command line
372
373
  buildTag              :: String,      -- ^ The global \"way\" (e.g. \"p\" for prof)
  rtsBuildTag           :: String,      -- ^ The RTS \"way\"
Ian Lynagh's avatar
Ian Lynagh committed
374

375
376
377
  -- For object splitting
  splitInfo             :: Maybe (String,Int),

378
  -- paths etc.
Ian Lynagh's avatar
Ian Lynagh committed
379
380
381
  objectDir             :: Maybe String,
  hiDir                 :: Maybe String,
  stubDir               :: Maybe String,
382

Ian Lynagh's avatar
Ian Lynagh committed
383
384
385
  objectSuf             :: String,
  hcSuf                 :: String,
  hiSuf                 :: String,
386

Ian Lynagh's avatar
Ian Lynagh committed
387
388
389
  outputFile            :: Maybe String,
  outputHi              :: Maybe String,
  dynLibLoader          :: DynLibLoader,
390

391
  -- | This is set by 'DriverPipeline.runPipeline' based on where
Ian Lynagh's avatar
Ian Lynagh committed
392
393
  --    its output is going.
  dumpPrefix            :: Maybe FilePath,
394

395
396
  -- | Override the 'dumpPrefix' set by 'DriverPipeline.runPipeline'.
  --    Set by @-ddump-file-prefix@
Ian Lynagh's avatar
Ian Lynagh committed
397
398
399
400
401
402
403
404
  dumpPrefixForce       :: Maybe FilePath,

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

405
406
407
  ghcUsagePath          :: FilePath,    -- Filled in by SysTools
  ghciUsagePath         :: FilePath,    -- ditto

408
  hpcDir                :: String,      -- ^ Path to store the .mix files
andy@galois.com's avatar
andy@galois.com committed
409

410
  -- options for particular phases
Ian Lynagh's avatar
Ian Lynagh committed
411
412
413
414
415
416
417
418
  opt_L                 :: [String],
  opt_P                 :: [String],
  opt_F                 :: [String],
  opt_c                 :: [String],
  opt_m                 :: [String],
  opt_a                 :: [String],
  opt_l                 :: [String],
  opt_windres           :: [String],
419
420

  -- commands for particular phases
Ian Lynagh's avatar
Ian Lynagh committed
421
422
423
424
425
426
427
428
429
  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]),
430
431
  pgm_T                 :: String,
  pgm_sysman            :: String,
432
  pgm_windres           :: String,
433

434
435
436
437
438
439
  --  For ghc -M
  depMakefile           :: FilePath,
  depIncludePkgDeps     :: Bool,
  depExcludeMods        :: [ModuleName],
  depSuffixes           :: [String],

440
  --  Package flags
Ian Lynagh's avatar
Ian Lynagh committed
441
  extraPkgConfs         :: [FilePath],
442
443
  topDir                :: FilePath,    -- filled in by SysTools
  systemPackageConfig   :: FilePath,    -- ditto
444
        -- ^ The @-package-conf@ flags given on the command line, in the order
Ian Lynagh's avatar
Ian Lynagh committed
445
        -- they appeared.
446

Ian Lynagh's avatar
Ian Lynagh committed
447
  packageFlags          :: [PackageFlag],
448
        -- ^ The @-package@ and @-hide-package@ flags from the command-line
449

450
  -- Package state
Ian Lynagh's avatar
Ian Lynagh committed
451
  -- NB. do not modify this field, it is calculated by
452
  -- Packages.initPackages and Packages.updatePackages.
453
  pkgDatabase           :: Maybe [PackageConfig],
Ian Lynagh's avatar
Ian Lynagh committed
454
  pkgState              :: PackageState,
455

456
457
458
459
460
461
  -- 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),

462
  -- hsc dynamic flags
Ian Lynagh's avatar
Ian Lynagh committed
463
464
  flags                 :: [DynFlag],

465
  -- | Message output action: use "ErrUtils" instead of this if you can
David Waern's avatar
David Waern committed
466
467
468
  log_action            :: Severity -> SrcSpan -> PprStyle -> Message -> IO (),

  haddockOptions :: Maybe String
469
470
 }

471
472
473
wayNames :: DynFlags -> [WayName]
wayNames = map wayName . ways

474
475
-- | The target code type of the compilation (if any).
--
476
477
478
-- Whenever you change the target, also make sure to set 'ghcLink' to
-- something sensible.
--
479
480
481
482
-- 'HscNothing' can be used to avoid generating any output, however, note
-- that:
--
--  * This will not run the desugaring step, thus no warnings generated in
483
484
485
--    this step will be output.  In particular, this includes warnings related
--    to pattern matching.  You can run the desugarer manually using
--    'GHC.desugarModule'.
486
--
487
488
489
490
491
492
--  * 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.)
493
--
494
data HscTarget
495
496
497
498
499
  = 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.
500
501
  deriving (Eq, Show)

502
-- | Will this target result in an object file on the disk?
503
504
505
506
507
508
509
510
511
512
513
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.
514
data GhcMode
515
516
517
  = CompManager         -- ^ @\-\-make@, GHCi, etc.
  | OneShot             -- ^ @ghc -c Foo.hs@
  | MkDepend            -- ^ @ghc -M@, see "Finder" for why we need this
518
519
  deriving Eq

520
521
522
523
524
instance Outputable GhcMode where
  ppr CompManager = ptext (sLit "CompManager")
  ppr OneShot     = ptext (sLit "OneShot")
  ppr MkDepend    = ptext (sLit "MkDepend")

525
526
527
528
isOneShot :: GhcMode -> Bool
isOneShot OneShot = True
isOneShot _other  = False

529
530
531
532
-- | 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
533
534
  | LinkInMemory        -- ^ Use the in-memory dynamic linker (works for both
                        --   bytecode and object code).
535
  | LinkDynLib          -- ^ Link objects into a dynamic lib (DLL on Windows, DSO on ELF platforms)
536
  deriving (Eq, Show)
537
538
539

isNoLink :: GhcLink -> Bool
isNoLink NoLink = True
twanvl's avatar
twanvl committed
540
isNoLink _      = False
541

542
543
544
545
546
-- Is it worth evaluating this Bool and caching it in the DynFlags value
-- during initDynFlags?
doingTickyProfiling :: DynFlags -> Bool
doingTickyProfiling dflags = WayTicky `elem` wayNames dflags

547
548
data PackageFlag
  = ExposePackage  String
549
  | ExposePackageId String
550
551
  | HidePackage    String
  | IgnorePackage  String
552
  deriving Eq
553

twanvl's avatar
twanvl committed
554
defaultHscTarget :: HscTarget
555
556
defaultHscTarget = defaultObjectTarget

557
-- | The 'HscTarget' value corresponding to the default way to create
558
-- object files on the current platform.
twanvl's avatar
twanvl committed
559
defaultObjectTarget :: HscTarget
560
defaultObjectTarget
Ian Lynagh's avatar
Ian Lynagh committed
561
562
  | cGhcWithNativeCodeGen == "YES"      =  HscAsm
  | otherwise                           =  HscC
563

564
565
566
567
568
569
data DynLibLoader
  = Deployable
  | Wrapped (Maybe String)
  | SystemDependent
  deriving Eq

570
-- | Used by 'GHC.newSession' to partially initialize a new 'DynFlags' value
twanvl's avatar
twanvl committed
571
initDynFlags :: DynFlags -> IO DynFlags
572
573
574
initDynFlags dflags = do
 -- someday these will be dynamic flags
 ways <- readIORef v_Ways
575
576
 refFilesToClean <- newIORef []
 refDirsToClean <- newIORef emptyFM
577
 return dflags{
578
579
580
        ways            = ways,
        buildTag        = mkBuildTag (filter (not . wayRTSOnly) ways),
        rtsBuildTag     = mkBuildTag ways,
581
582
        filesToClean    = refFilesToClean,
        dirsToClean     = refDirsToClean
Ian Lynagh's avatar
Ian Lynagh committed
583
        }
584

585
586
-- | 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
587
defaultDynFlags :: DynFlags
588
589
defaultDynFlags =
     DynFlags {
Ian Lynagh's avatar
Ian Lynagh committed
590
591
592
593
594
595
596
597
598
        ghcMode                 = CompManager,
        ghcLink                 = LinkBinary,
        coreToDo                = Nothing,
        stgToDo                 = Nothing,
        hscTarget               = defaultHscTarget,
        hscOutName              = "",
        extCoreName             = "",
        verbosity               = 0,
        optLevel                = 0,
599
        simplPhases             = 2,
Ian Lynagh's avatar
Ian Lynagh committed
600
        maxSimplIterations      = 4,
601
        shouldDumpSimplPhase    = const False,
Ian Lynagh's avatar
Ian Lynagh committed
602
603
604
        ruleCheck               = Nothing,
        specConstrThreshold     = Just 200,
        specConstrCount         = Just 3,
605
        liberateCaseThreshold   = Just 200,
606
#ifndef OMIT_NATIVE_CODEGEN
607
        targetPlatform          = defaultTargetPlatform,
608
#endif
Ian Lynagh's avatar
Ian Lynagh committed
609
610
611
612
613
614
615
        stolen_x86_regs         = 4,
        cmdlineHcIncludes       = [],
        importPaths             = ["."],
        mainModIs               = mAIN,
        mainFunIs               = Nothing,
        ctxtStkDepth            = mAX_CONTEXT_REDUCTION_DEPTH,

616
617
        dphBackend              = DPHPar,

Ian Lynagh's avatar
Ian Lynagh committed
618
619
620
621
622
623
624
625
626
627
628
629
        thisPackage             = mainPackageId,

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

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

        outputFile              = Nothing,
        outputHi                = Nothing,
630
        dynLibLoader            = SystemDependent,
Ian Lynagh's avatar
Ian Lynagh committed
631
632
633
634
635
636
637
638
639
640
641
642
        dumpPrefix              = Nothing,
        dumpPrefixForce         = Nothing,
        includePaths            = [],
        libraryPaths            = [],
        frameworkPaths          = [],
        cmdlineFrameworks       = [],
        tmpDir                  = cDEFAULT_TMPDIR,

        hpcDir                  = ".hpc",

        opt_L                   = [],
        opt_P                   = (if opt_PIC
643
                                   then ["-D__PIC__", "-U __PIC__"] -- this list is reversed
Ian Lynagh's avatar
Ian Lynagh committed
644
645
646
647
648
649
                                   else []),
        opt_F                   = [],
        opt_c                   = [],
        opt_a                   = [],
        opt_m                   = [],
        opt_l                   = [],
650
        opt_windres             = [],
Ian Lynagh's avatar
Ian Lynagh committed
651
652
653

        extraPkgConfs           = [],
        packageFlags            = [],
654
655
        pkgDatabase             = Nothing,
        pkgState                = panic "no package state yet: call GHC.setSessionDynFlags",
656
        ways                    = panic "defaultDynFlags: No ways",
Ian Lynagh's avatar
Ian Lynagh committed
657
658
        buildTag                = panic "defaultDynFlags: No buildTag",
        rtsBuildTag             = panic "defaultDynFlags: No rtsBuildTag",
659
        splitInfo               = Nothing,
Ian Lynagh's avatar
Ian Lynagh committed
660
661
662
663
        -- initSysTools fills all these in
        ghcUsagePath            = panic "defaultDynFlags: No ghciUsagePath",
        ghciUsagePath           = panic "defaultDynFlags: No ghciUsagePath",
        topDir                  = panic "defaultDynFlags: No topDir",
664
        systemPackageConfig     = panic  "no systemPackageConfig: call GHC.setSessionDynFlags",
Ian Lynagh's avatar
Ian Lynagh committed
665
666
667
668
669
670
671
672
673
674
675
676
677
        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
678
679
680
681
682
683
        -- ghc -M values
        depMakefile       = "Makefile",
        depIncludePkgDeps = False,
        depExcludeMods    = [],
        depSuffixes       = [],
        -- end of ghc -M values
684
685
        filesToClean   = panic "defaultDynFlags: No filesToClean",
        dirsToClean    = panic "defaultDynFlags: No dirsToClean",
Ian Lynagh's avatar
Ian Lynagh committed
686
        haddockOptions = Nothing,
687
        flags = [
688
            Opt_AutoLinkPackages,
689
690
691
692
693
694
695
696
            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,
697
            Opt_NPlusKPatterns,
698

699
700
            Opt_MethodSharing,

701
702
            Opt_DoAsmMangling,

Ian Lynagh's avatar
Ian Lynagh committed
703
704
            Opt_SharedImplib,

705
            Opt_GenManifest,
706
707
            Opt_EmbedManifest,
            Opt_PrintBindContents
708
709
710
711
712
            ]
            ++ [f | (ns,f) <- optLevelFlags, 0 `elem` ns]
                    -- The default -O0 options
            ++ standardWarnings,

Ian Lynagh's avatar
Ian Lynagh committed
713
        log_action = \severity srcSpan style msg ->
714
                        case severity of
715
716
717
718
719
720
721
722
                          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.
723
724
      }

Ian Lynagh's avatar
Ian Lynagh committed
725
{-
726
    #verbosity_levels#
727
    Verbosity levels:
Ian Lynagh's avatar
Ian Lynagh committed
728
729

    0   |   print errors & warnings only
730
731
732
733
734
735
736
    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"
-}

737
-- | Test whether a 'DynFlag' is set
738
739
740
dopt :: DynFlag -> DynFlags -> Bool
dopt f dflags  = f `elem` (flags dflags)

741
-- | Set a 'DynFlag'
742
743
744
dopt_set :: DynFlags -> DynFlag -> DynFlags
dopt_set dfs f = dfs{ flags = f : flags dfs }

745
-- | Unset a 'DynFlag'
746
747
748
dopt_unset :: DynFlags -> DynFlag -> DynFlags
dopt_unset dfs f = dfs{ flags = filter (/= f) (flags dfs) }

749
750
751
752
-- | 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
753
getOpts dflags opts = reverse (opts dflags)
Ian Lynagh's avatar
Ian Lynagh committed
754
        -- We add to the options from the front, so we need to reverse the list
755

756
757
-- | 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
758
getVerbFlag :: DynFlags -> String
Ian Lynagh's avatar
Ian Lynagh committed
759
760
getVerbFlag dflags
  | verbosity dflags >= 3  = "-v"
761
762
  | otherwise =  ""

Simon Marlow's avatar
Simon Marlow committed
763
764
setObjectDir, setHiDir, setStubDir, setOutputDir,
         setObjectSuf, setHiSuf, setHcSuf, parseDynLibLoaderMode,
twanvl's avatar
twanvl committed
765
         setPgmP, setPgmL, setPgmF, setPgmc, setPgmm, setPgms, setPgma, setPgml, setPgmdll, setPgmwindres,
766
         addOptL, addOptP, addOptF, addOptc, addOptm, addOpta, addOptl, addOptwindres,
twanvl's avatar
twanvl committed
767
768
769
770
771
         addCmdlineFramework, addHaddockOpts
   :: String -> DynFlags -> DynFlags
setOutputFile, setOutputHi, setDumpPrefixForce
   :: Maybe String -> DynFlags -> DynFlags

772
773
774
775
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
776
  -- \#included from the .hc file when compiling with -fvia-C.
Simon Marlow's avatar
Simon Marlow committed
777
setOutputDir  f = setObjectDir f . setHiDir f . setStubDir f
778

779
780
setObjectSuf  f d = d{ objectSuf  = f}
setHiSuf      f d = d{ hiSuf      = f}
781
782
783
784
setHcSuf      f d = d{ hcSuf      = f}

setOutputFile f d = d{ outputFile = f}
setOutputHi   f d = d{ outputHi   = f}
785

786
787
788
789
790
791
792
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) }
793
   _                    -> ghcError (CmdLineError ("Unknown dynlib loader: " ++ f))
794

795
796
setDumpPrefixForce f d = d { dumpPrefixForce = f}

797
798
799
800
801
802
803
804
805
806
807
808
-- 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,[])}
809
setPgmwindres f d = d{ pgm_windres = f}
810
811
812
813
814
815
816
817

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}
818
addOptwindres f d = d{ opt_windres = f : opt_windres d}
819

820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
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
837
deOptDep x = case stripPrefix "-optdep" x of
838
839
840
             Just rest -> rest
             Nothing -> x

841
842
addCmdlineFramework f d = d{ cmdlineFrameworks = f : cmdlineFrameworks d}

David Waern's avatar
David Waern committed
843
844
addHaddockOpts f d = d{ haddockOptions = Just f}

845
846
847
-- -----------------------------------------------------------------------------
-- Command-line options

848
-- | When invoking external tools as part of the compilation pipeline, we
849
850
-- 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
851
-- between filepaths and 'other stuff'. The reason for this is that
852
-- this type gives us a handle on transforming filenames, and filenames only,
853
-- to whatever format they're expected to be on a particular platform.
854
855
data Option
 = FileOption -- an entry that _contains_ filename(s) / filepaths.
Ian Lynagh's avatar
Ian Lynagh committed
856
857
858
              String  -- a non-filepath prefix that shouldn't be
                      -- transformed (e.g., "/out=")
              String  -- the filepath/filename portion
859
 | Option     String
Ian Lynagh's avatar
Ian Lynagh committed
860

Ian Lynagh's avatar
Ian Lynagh committed
861
862
863
864
showOpt :: Option -> String
showOpt (FileOption pre f) = pre ++ f
showOpt (Option s)  = s

865
866
867
868
-----------------------------------------------------------------------------
-- Setting the optimisation level

updOptLevel :: Int -> DynFlags -> DynFlags
869
-- ^ Sets the 'DynFlags' to be appropriate to the optimisation level
870
updOptLevel n dfs
871
  = dfs2{ optLevel = final_n }
872
  where
Ian Lynagh's avatar
Ian Lynagh committed
873
   final_n = max 0 (min 2 n)    -- Clamp to 0 <= n <= 2
874
875
876
   dfs1 = foldr (flip dopt_unset) dfs  remove_dopts
   dfs2 = foldr (flip dopt_set)   dfs1 extra_dopts

877
878
   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
879

880
881
optLevelFlags :: [([Int], DynFlag)]
optLevelFlags
Ian Lynagh's avatar
Ian Lynagh committed
882
  = [ ([0],     Opt_IgnoreInterfacePragmas)
883
    , ([0],     Opt_OmitInterfacePragmas)
884

Ian Lynagh's avatar
Ian Lynagh committed
885
    , ([1,2],   Opt_IgnoreAsserts)
886
887
    , ([1,2],   Opt_EnableRewriteRules)  -- Off for -O0; see Note [Scoping for Builtin rules]
                                         --              in PrelRules
Ian Lynagh's avatar
Ian Lynagh committed
888
889
890
891
892
    , ([1,2],   Opt_DoEtaReduction)
    , ([1,2],   Opt_CaseMerge)
    , ([1,2],   Opt_Strictness)
    , ([1,2],   Opt_CSE)
    , ([1,2],   Opt_FullLaziness)
893

Ian Lynagh's avatar
Ian Lynagh committed
894
895
    , ([2],     Opt_LiberateCase)
    , ([2],     Opt_SpecConstr)
896
897
898
899
900
901
902
903
904
905

--     , ([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.
906
907

    , ([0,1,2], Opt_DoLambdaEtaExpansion)
Ian Lynagh's avatar
Ian Lynagh committed
908
909
910
911
                -- 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.
912
913
914
915
916
    ]

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

twanvl's avatar
twanvl committed
917
standardWarnings :: [DynFlag]
918
standardWarnings
Ian Lynagh's avatar
Ian Lynagh committed
919
    = [ Opt_WarnWarningsDeprecations,
920
        Opt_WarnDeprecatedFlags,
921
        Opt_WarnUnrecognisedPragmas,
Ian Lynagh's avatar
Ian Lynagh committed
922
923
924
        Opt_WarnOverlappingPatterns,
        Opt_WarnMissingFields,
        Opt_WarnMissingMethods,
925
        Opt_WarnDuplicateExports,
926
        Opt_WarnLazyUnliftedBindings,
927
928
        Opt_WarnDodgyForeignImports,
        Opt_WarnWrongDoBind
929
930
      ]

twanvl's avatar
twanvl committed
931
minusWOpts :: [DynFlag]
932
minusWOpts
Ian Lynagh's avatar
Ian Lynagh committed
933
934
935
936
937
    = standardWarnings ++
      [ Opt_WarnUnusedBinds,
        Opt_WarnUnusedMatches,
        Opt_WarnUnusedImports,
        Opt_WarnIncompletePatterns,
938
        Opt_WarnDodgyExports,
Ian Lynagh's avatar
Ian Lynagh committed
939
        Opt_WarnDodgyImports
940
941
      ]

twanvl's avatar
twanvl committed
942
minusWallOpts :: [DynFlag]
943
944
minusWallOpts
    = minusWOpts ++
Ian Lynagh's avatar
Ian Lynagh committed
945
946
947
948
      [ Opt_WarnTypeDefaults,
        Opt_WarnNameShadowing,
        Opt_WarnMissingSigs,
        Opt_WarnHiShadows,
949
950
        Opt_WarnOrphans,
        Opt_WarnUnusedDoBind
951
952
      ]

953
-- minuswRemovesOpts should be every warning option
twanvl's avatar
twanvl committed
954
minuswRemovesOpts :: [DynFlag]
955
956
957
958
959
960
minuswRemovesOpts
    = minusWallOpts ++
      [Opt_WarnImplicitPrelude,
       Opt_WarnIncompletePatternsRecUpd,
       Opt_WarnSimplePatterns,
       Opt_WarnMonomorphism,
961
       Opt_WarnUnrecognisedPragmas,
962
963
964
       Opt_WarnTabs
      ]

965
966
967
-- -----------------------------------------------------------------------------
-- CoreToDo:  abstraction of core-to-core passes to run.

Ian Lynagh's avatar
Ian Lynagh committed
968
969
970
data CoreToDo           -- These are diff core-to-core passes,
                        -- which may be invoked in any order,
                        -- as many times as you like.
971

Ian Lynagh's avatar
Ian Lynagh committed
972
973
974
975
976
  = CoreDoSimplify      -- The core-to-core simplifier.
        SimplifierMode
        [SimplifierSwitch]
                        -- Each run of the simplifier can take a different
                        -- set of simplifier-specific flags.