DynFlags.hs 96.8 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_DoRec
250
   | Opt_PostfixOperators
251
   | Opt_TupleSections
Ian Lynagh's avatar
Ian Lynagh committed
252
   | Opt_PatternGuards
253
   | Opt_LiberalTypeSynonyms
254
255
   | Opt_Rank2Types
   | Opt_RankNTypes
256
   | Opt_ImpredicativeTypes
Ian Lynagh's avatar
Ian Lynagh committed
257
   | Opt_TypeOperators
258
   | Opt_PackageImports
259
   | Opt_NewQualifiedOperators
260
   | Opt_ExplicitForAll
261

262
263
   | Opt_PrintExplicitForalls

264
265
266
   -- optimisation opts
   | Opt_Strictness
   | Opt_FullLaziness
267
268
   | Opt_FloatIn
   | Opt_Specialise
269
   | Opt_StaticArgumentTransformation
270
   | Opt_CSE
271
272
   | Opt_LiberateCase
   | Opt_SpecConstr
273
274
275
276
277
278
279
   | Opt_IgnoreInterfacePragmas
   | Opt_OmitInterfacePragmas
   | Opt_DoLambdaEtaExpansion
   | Opt_IgnoreAsserts
   | Opt_DoEtaReduction
   | Opt_CaseMerge
   | Opt_UnboxStrictFields
280
   | Opt_MethodSharing
281
   | Opt_DictsCheap
282
   | Opt_InlineIfEnoughArgs
283
   | Opt_EnableRewriteRules		-- Apply rewrite rules during simplification
rl@cse.unsw.edu.au's avatar
rl@cse.unsw.edu.au committed
284
   | Opt_Vectorise
Ian Lynagh's avatar
Ian Lynagh committed
285
286
   | Opt_RegsGraph                      -- do graph coloring register allocation
   | Opt_RegsIterative                  -- do iterative coalescing graph coloring register allocation
287

Ian Lynagh's avatar
Ian Lynagh committed
288
289
290
291
292
   -- profiling opts
   | Opt_AutoSccsOnAllToplevs
   | Opt_AutoSccsOnExportedToplevs
   | Opt_AutoSccsOnIndividualCafs

293
294
295
   -- misc opts
   | Opt_Cpp
   | Opt_Pp
296
   | Opt_ForceRecomp
297
298
299
   | Opt_DryRun
   | Opt_DoAsmMangling
   | Opt_ExcessPrecision
300
   | Opt_EagerBlackHoling
301
302
303
304
   | Opt_ReadUserPackageConf
   | Opt_NoHsMain
   | Opt_SplitObjs
   | Opt_StgStats
305
   | Opt_HideAllPackages
306
   | Opt_PrintBindResult
307
   | Opt_Haddock
David Waern's avatar
David Waern committed
308
   | Opt_HaddockOptions
309
   | Opt_Hpc_No_Auto
310
   | Opt_BreakOnException
311
   | Opt_BreakOnError
312
   | Opt_PrintEvldWithShow
313
   | Opt_PrintBindContents
314
315
   | Opt_GenManifest
   | Opt_EmbedManifest
316
   | Opt_EmitExternalCore
Ian Lynagh's avatar
Ian Lynagh committed
317
   | Opt_SharedImplib
318
   | Opt_BuildingCabalPackage
319
320
321

	-- temporary flags
   | Opt_RunCPS
322
323
   | Opt_RunCPSZ
   | Opt_ConvertToZipCfgAndBack
324
   | Opt_AutoLinkPackages
325
   | Opt_ImplicitImportQualified
326
   | Opt_TryNewCodeGen
327
328
329
330
331
332
333

   -- keeping stuff
   | Opt_KeepHiDiffs
   | Opt_KeepHcFiles
   | Opt_KeepSFiles
   | Opt_KeepRawSFiles
   | Opt_KeepTmpFiles
Jedai's avatar
Jedai committed
334
   | Opt_KeepRawTokenStream
335

336
   deriving (Eq, Show)
Ian Lynagh's avatar
Ian Lynagh committed
337

338
339
-- | 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
340
data DynFlags = DynFlags {
Ian Lynagh's avatar
Ian Lynagh committed
341
342
343
344
345
  ghcMode               :: GhcMode,
  ghcLink               :: GhcLink,
  coreToDo              :: Maybe [CoreToDo], -- reserved for -Ofile
  stgToDo               :: Maybe [StgToDo],  -- similarly
  hscTarget             :: HscTarget,
346
  hscOutName            :: String,      -- ^ Name of the output file
347
  extCoreName           :: String,      -- ^ Name of the .hcr output file
348
349
350
351
  verbosity             :: Int,         -- ^ Verbosity level: see "DynFlags#verbosity_levels"
  optLevel              :: Int,         -- ^ Optimisation level
  simplPhases           :: Int,         -- ^ Number of simplifier phases
  maxSimplIterations    :: Int,         -- ^ Max simplifier iterations
352
  shouldDumpSimplPhase  :: SimplifierMode -> Bool,
Ian Lynagh's avatar
Ian Lynagh committed
353
  ruleCheck             :: Maybe String,
354

355
356
357
  specConstrThreshold   :: Maybe Int,   -- ^ Threshold for SpecConstr
  specConstrCount       :: Maybe Int,   -- ^ Max number of specialisations for any one function
  liberateCaseThreshold :: Maybe Int,   -- ^ Threshold for LiberateCase
358

359
#ifndef OMIT_NATIVE_CODEGEN
360
  targetPlatform	:: Platform,	-- ^ The platform we're compiling for. Used by the NCG.
361
#endif
Ian Lynagh's avatar
Ian Lynagh committed
362
  stolen_x86_regs       :: Int,
363
  cmdlineHcIncludes     :: [String],    -- ^ @\-\#includes@
Ian Lynagh's avatar
Ian Lynagh committed
364
365
366
  importPaths           :: [FilePath],
  mainModIs             :: Module,
  mainFunIs             :: Maybe String,
367
  ctxtStkDepth          :: Int,         -- ^ Typechecker context stack depth
368

369
370
  dphBackend            :: DPHBackend,

371
  thisPackage           :: PackageId,   -- ^ name of package currently being compiled
372
373

  -- ways
374
  ways                  :: [Way],       -- ^ Way flags from the command line
375
376
  buildTag              :: String,      -- ^ The global \"way\" (e.g. \"p\" for prof)
  rtsBuildTag           :: String,      -- ^ The RTS \"way\"
Ian Lynagh's avatar
Ian Lynagh committed
377

378
379
380
  -- For object splitting
  splitInfo             :: Maybe (String,Int),

381
  -- paths etc.
Ian Lynagh's avatar
Ian Lynagh committed
382
383
384
  objectDir             :: Maybe String,
  hiDir                 :: Maybe String,
  stubDir               :: Maybe String,
385

Ian Lynagh's avatar
Ian Lynagh committed
386
387
388
  objectSuf             :: String,
  hcSuf                 :: String,
  hiSuf                 :: String,
389

Ian Lynagh's avatar
Ian Lynagh committed
390
391
392
  outputFile            :: Maybe String,
  outputHi              :: Maybe String,
  dynLibLoader          :: DynLibLoader,
393

394
  -- | This is set by 'DriverPipeline.runPipeline' based on where
Ian Lynagh's avatar
Ian Lynagh committed
395
396
  --    its output is going.
  dumpPrefix            :: Maybe FilePath,
397

398
399
  -- | Override the 'dumpPrefix' set by 'DriverPipeline.runPipeline'.
  --    Set by @-ddump-file-prefix@
Ian Lynagh's avatar
Ian Lynagh committed
400
401
402
403
404
405
406
407
  dumpPrefixForce       :: Maybe FilePath,

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

408
409
410
  ghcUsagePath          :: FilePath,    -- Filled in by SysTools
  ghciUsagePath         :: FilePath,    -- ditto

411
  hpcDir                :: String,      -- ^ Path to store the .mix files
andy@galois.com's avatar
andy@galois.com committed
412

413
  -- options for particular phases
Ian Lynagh's avatar
Ian Lynagh committed
414
415
416
417
418
419
420
421
  opt_L                 :: [String],
  opt_P                 :: [String],
  opt_F                 :: [String],
  opt_c                 :: [String],
  opt_m                 :: [String],
  opt_a                 :: [String],
  opt_l                 :: [String],
  opt_windres           :: [String],
422
423

  -- commands for particular phases
Ian Lynagh's avatar
Ian Lynagh committed
424
425
426
427
428
429
430
431
432
  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]),
433
434
  pgm_T                 :: String,
  pgm_sysman            :: String,
435
  pgm_windres           :: String,
436

437
438
439
440
441
442
  --  For ghc -M
  depMakefile           :: FilePath,
  depIncludePkgDeps     :: Bool,
  depExcludeMods        :: [ModuleName],
  depSuffixes           :: [String],

443
  --  Package flags
Ian Lynagh's avatar
Ian Lynagh committed
444
  extraPkgConfs         :: [FilePath],
445
446
  topDir                :: FilePath,    -- filled in by SysTools
  systemPackageConfig   :: FilePath,    -- ditto
447
        -- ^ The @-package-conf@ flags given on the command line, in the order
Ian Lynagh's avatar
Ian Lynagh committed
448
        -- they appeared.
449

Ian Lynagh's avatar
Ian Lynagh committed
450
  packageFlags          :: [PackageFlag],
451
        -- ^ The @-package@ and @-hide-package@ flags from the command-line
452

453
  -- Package state
Ian Lynagh's avatar
Ian Lynagh committed
454
  -- NB. do not modify this field, it is calculated by
455
  -- Packages.initPackages and Packages.updatePackages.
456
  pkgDatabase           :: Maybe [PackageConfig],
Ian Lynagh's avatar
Ian Lynagh committed
457
  pkgState              :: PackageState,
458

459
460
461
462
463
464
  -- 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),

465
  -- hsc dynamic flags
Ian Lynagh's avatar
Ian Lynagh committed
466
467
  flags                 :: [DynFlag],

468
  -- | Message output action: use "ErrUtils" instead of this if you can
David Waern's avatar
David Waern committed
469
470
471
  log_action            :: Severity -> SrcSpan -> PprStyle -> Message -> IO (),

  haddockOptions :: Maybe String
472
473
 }

474
475
476
wayNames :: DynFlags -> [WayName]
wayNames = map wayName . ways

477
478
-- | The target code type of the compilation (if any).
--
479
480
481
-- Whenever you change the target, also make sure to set 'ghcLink' to
-- something sensible.
--
482
483
484
485
-- 'HscNothing' can be used to avoid generating any output, however, note
-- that:
--
--  * This will not run the desugaring step, thus no warnings generated in
486
487
488
--    this step will be output.  In particular, this includes warnings related
--    to pattern matching.  You can run the desugarer manually using
--    'GHC.desugarModule'.
489
--
490
491
492
493
494
495
--  * 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.)
496
--
497
data HscTarget
498
499
500
501
502
  = 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.
503
504
  deriving (Eq, Show)

505
-- | Will this target result in an object file on the disk?
506
507
508
509
510
511
512
513
514
515
516
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.
517
data GhcMode
518
519
520
  = CompManager         -- ^ @\-\-make@, GHCi, etc.
  | OneShot             -- ^ @ghc -c Foo.hs@
  | MkDepend            -- ^ @ghc -M@, see "Finder" for why we need this
521
522
  deriving Eq

523
524
525
526
527
instance Outputable GhcMode where
  ppr CompManager = ptext (sLit "CompManager")
  ppr OneShot     = ptext (sLit "OneShot")
  ppr MkDepend    = ptext (sLit "MkDepend")

528
529
530
531
isOneShot :: GhcMode -> Bool
isOneShot OneShot = True
isOneShot _other  = False

532
533
534
535
-- | 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
536
537
  | LinkInMemory        -- ^ Use the in-memory dynamic linker (works for both
                        --   bytecode and object code).
538
  | LinkDynLib          -- ^ Link objects into a dynamic lib (DLL on Windows, DSO on ELF platforms)
539
  deriving (Eq, Show)
540
541
542

isNoLink :: GhcLink -> Bool
isNoLink NoLink = True
twanvl's avatar
twanvl committed
543
isNoLink _      = False
544

545
546
547
548
549
-- Is it worth evaluating this Bool and caching it in the DynFlags value
-- during initDynFlags?
doingTickyProfiling :: DynFlags -> Bool
doingTickyProfiling dflags = WayTicky `elem` wayNames dflags

550
551
data PackageFlag
  = ExposePackage  String
552
  | ExposePackageId String
553
554
  | HidePackage    String
  | IgnorePackage  String
555
  deriving Eq
556

twanvl's avatar
twanvl committed
557
defaultHscTarget :: HscTarget
558
559
defaultHscTarget = defaultObjectTarget

560
-- | The 'HscTarget' value corresponding to the default way to create
561
-- object files on the current platform.
twanvl's avatar
twanvl committed
562
defaultObjectTarget :: HscTarget
563
defaultObjectTarget
Ian Lynagh's avatar
Ian Lynagh committed
564
565
  | cGhcWithNativeCodeGen == "YES"      =  HscAsm
  | otherwise                           =  HscC
566

567
568
569
570
571
572
data DynLibLoader
  = Deployable
  | Wrapped (Maybe String)
  | SystemDependent
  deriving Eq

573
-- | Used by 'GHC.newSession' to partially initialize a new 'DynFlags' value
twanvl's avatar
twanvl committed
574
initDynFlags :: DynFlags -> IO DynFlags
575
576
577
initDynFlags dflags = do
 -- someday these will be dynamic flags
 ways <- readIORef v_Ways
578
579
 refFilesToClean <- newIORef []
 refDirsToClean <- newIORef emptyFM
580
 return dflags{
581
582
583
        ways            = ways,
        buildTag        = mkBuildTag (filter (not . wayRTSOnly) ways),
        rtsBuildTag     = mkBuildTag ways,
584
585
        filesToClean    = refFilesToClean,
        dirsToClean     = refDirsToClean
Ian Lynagh's avatar
Ian Lynagh committed
586
        }
587

588
589
-- | 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
590
defaultDynFlags :: DynFlags
591
592
defaultDynFlags =
     DynFlags {
Ian Lynagh's avatar
Ian Lynagh committed
593
594
595
596
597
598
599
600
601
        ghcMode                 = CompManager,
        ghcLink                 = LinkBinary,
        coreToDo                = Nothing,
        stgToDo                 = Nothing,
        hscTarget               = defaultHscTarget,
        hscOutName              = "",
        extCoreName             = "",
        verbosity               = 0,
        optLevel                = 0,
602
        simplPhases             = 2,
Ian Lynagh's avatar
Ian Lynagh committed
603
        maxSimplIterations      = 4,
604
        shouldDumpSimplPhase    = const False,
Ian Lynagh's avatar
Ian Lynagh committed
605
606
607
        ruleCheck               = Nothing,
        specConstrThreshold     = Just 200,
        specConstrCount         = Just 3,
608
        liberateCaseThreshold   = Just 200,
609
#ifndef OMIT_NATIVE_CODEGEN
610
        targetPlatform          = defaultTargetPlatform,
611
#endif
Ian Lynagh's avatar
Ian Lynagh committed
612
613
614
615
616
617
618
        stolen_x86_regs         = 4,
        cmdlineHcIncludes       = [],
        importPaths             = ["."],
        mainModIs               = mAIN,
        mainFunIs               = Nothing,
        ctxtStkDepth            = mAX_CONTEXT_REDUCTION_DEPTH,

619
620
        dphBackend              = DPHPar,

Ian Lynagh's avatar
Ian Lynagh committed
621
622
623
624
625
626
627
628
629
630
631
632
        thisPackage             = mainPackageId,

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

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

        outputFile              = Nothing,
        outputHi                = Nothing,
633
        dynLibLoader            = SystemDependent,
Ian Lynagh's avatar
Ian Lynagh committed
634
635
636
637
638
639
640
641
642
643
644
645
        dumpPrefix              = Nothing,
        dumpPrefixForce         = Nothing,
        includePaths            = [],
        libraryPaths            = [],
        frameworkPaths          = [],
        cmdlineFrameworks       = [],
        tmpDir                  = cDEFAULT_TMPDIR,

        hpcDir                  = ".hpc",

        opt_L                   = [],
        opt_P                   = (if opt_PIC
646
                                   then ["-D__PIC__", "-U __PIC__"] -- this list is reversed
Ian Lynagh's avatar
Ian Lynagh committed
647
648
649
650
651
652
                                   else []),
        opt_F                   = [],
        opt_c                   = [],
        opt_a                   = [],
        opt_m                   = [],
        opt_l                   = [],
653
        opt_windres             = [],
Ian Lynagh's avatar
Ian Lynagh committed
654
655
656

        extraPkgConfs           = [],
        packageFlags            = [],
657
658
        pkgDatabase             = Nothing,
        pkgState                = panic "no package state yet: call GHC.setSessionDynFlags",
659
        ways                    = panic "defaultDynFlags: No ways",
Ian Lynagh's avatar
Ian Lynagh committed
660
661
        buildTag                = panic "defaultDynFlags: No buildTag",
        rtsBuildTag             = panic "defaultDynFlags: No rtsBuildTag",
662
        splitInfo               = Nothing,
Ian Lynagh's avatar
Ian Lynagh committed
663
664
665
666
        -- initSysTools fills all these in
        ghcUsagePath            = panic "defaultDynFlags: No ghciUsagePath",
        ghciUsagePath           = panic "defaultDynFlags: No ghciUsagePath",
        topDir                  = panic "defaultDynFlags: No topDir",
667
        systemPackageConfig     = panic  "no systemPackageConfig: call GHC.setSessionDynFlags",
Ian Lynagh's avatar
Ian Lynagh committed
668
669
670
671
672
673
674
675
676
677
678
679
680
        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
681
682
683
684
685
686
        -- ghc -M values
        depMakefile       = "Makefile",
        depIncludePkgDeps = False,
        depExcludeMods    = [],
        depSuffixes       = [],
        -- end of ghc -M values
687
688
        filesToClean   = panic "defaultDynFlags: No filesToClean",
        dirsToClean    = panic "defaultDynFlags: No dirsToClean",
Ian Lynagh's avatar
Ian Lynagh committed
689
        haddockOptions = Nothing,
690
        flags = [
691
            Opt_AutoLinkPackages,
692
693
694
695
696
697
698
699
            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,
700
            Opt_NPlusKPatterns,
701

702
703
            Opt_MethodSharing,

704
705
            Opt_DoAsmMangling,

Ian Lynagh's avatar
Ian Lynagh committed
706
707
            Opt_SharedImplib,

708
            Opt_GenManifest,
709
710
            Opt_EmbedManifest,
            Opt_PrintBindContents
711
712
713
714
715
            ]
            ++ [f | (ns,f) <- optLevelFlags, 0 `elem` ns]
                    -- The default -O0 options
            ++ standardWarnings,

Ian Lynagh's avatar
Ian Lynagh committed
716
        log_action = \severity srcSpan style msg ->
717
                        case severity of
718
719
720
721
722
723
724
725
                          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.
726
727
      }

Ian Lynagh's avatar
Ian Lynagh committed
728
{-
729
    #verbosity_levels#
730
    Verbosity levels:
Ian Lynagh's avatar
Ian Lynagh committed
731
732

    0   |   print errors & warnings only
733
734
735
736
737
738
739
    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"
-}

740
-- | Test whether a 'DynFlag' is set
741
742
743
dopt :: DynFlag -> DynFlags -> Bool
dopt f dflags  = f `elem` (flags dflags)

744
-- | Set a 'DynFlag'
745
746
747
dopt_set :: DynFlags -> DynFlag -> DynFlags
dopt_set dfs f = dfs{ flags = f : flags dfs }

748
-- | Unset a 'DynFlag'
749
750
751
dopt_unset :: DynFlags -> DynFlag -> DynFlags
dopt_unset dfs f = dfs{ flags = filter (/= f) (flags dfs) }

752
753
754
755
-- | 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
756
getOpts dflags opts = reverse (opts dflags)
Ian Lynagh's avatar
Ian Lynagh committed
757
        -- We add to the options from the front, so we need to reverse the list
758

759
760
-- | 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
761
getVerbFlag :: DynFlags -> String
Ian Lynagh's avatar
Ian Lynagh committed
762
763
getVerbFlag dflags
  | verbosity dflags >= 3  = "-v"
764
765
  | otherwise =  ""

Simon Marlow's avatar
Simon Marlow committed
766
767
setObjectDir, setHiDir, setStubDir, setOutputDir,
         setObjectSuf, setHiSuf, setHcSuf, parseDynLibLoaderMode,
twanvl's avatar
twanvl committed
768
         setPgmP, setPgmL, setPgmF, setPgmc, setPgmm, setPgms, setPgma, setPgml, setPgmdll, setPgmwindres,
769
         addOptL, addOptP, addOptF, addOptc, addOptm, addOpta, addOptl, addOptwindres,
twanvl's avatar
twanvl committed
770
771
772
773
774
         addCmdlineFramework, addHaddockOpts
   :: String -> DynFlags -> DynFlags
setOutputFile, setOutputHi, setDumpPrefixForce
   :: Maybe String -> DynFlags -> DynFlags

775
776
777
778
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
779
  -- \#included from the .hc file when compiling with -fvia-C.
Simon Marlow's avatar
Simon Marlow committed
780
setOutputDir  f = setObjectDir f . setHiDir f . setStubDir f
781

782
783
setObjectSuf  f d = d{ objectSuf  = f}
setHiSuf      f d = d{ hiSuf      = f}
784
785
786
787
setHcSuf      f d = d{ hcSuf      = f}

setOutputFile f d = d{ outputFile = f}
setOutputHi   f d = d{ outputHi   = f}
788

789
790
791
792
793
794
795
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) }
796
   _                    -> ghcError (CmdLineError ("Unknown dynlib loader: " ++ f))
797

798
799
setDumpPrefixForce f d = d { dumpPrefixForce = f}

800
801
802
803
804
805
806
807
808
809
810
811
-- 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,[])}
812
setPgmwindres f d = d{ pgm_windres = f}
813
814
815
816
817
818
819
820

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}
821
addOptwindres f d = d{ opt_windres = f : opt_windres d}
822

823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
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
840
deOptDep x = case stripPrefix "-optdep" x of
841
842
843
             Just rest -> rest
             Nothing -> x

844
845
addCmdlineFramework f d = d{ cmdlineFrameworks = f : cmdlineFrameworks d}

David Waern's avatar
David Waern committed
846
847
addHaddockOpts f d = d{ haddockOptions = Just f}

848
849
850
-- -----------------------------------------------------------------------------
-- Command-line options

851
-- | When invoking external tools as part of the compilation pipeline, we
852
853
-- 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
854
-- between filepaths and 'other stuff'. The reason for this is that
855
-- this type gives us a handle on transforming filenames, and filenames only,
856
-- to whatever format they're expected to be on a particular platform.
857
858
data Option
 = FileOption -- an entry that _contains_ filename(s) / filepaths.
Ian Lynagh's avatar
Ian Lynagh committed
859
860
861
              String  -- a non-filepath prefix that shouldn't be
                      -- transformed (e.g., "/out=")
              String  -- the filepath/filename portion
862
 | Option     String
Ian Lynagh's avatar
Ian Lynagh committed
863

Ian Lynagh's avatar
Ian Lynagh committed
864
865
866
867
showOpt :: Option -> String
showOpt (FileOption pre f) = pre ++ f
showOpt (Option s)  = s

868
869
870
871
-----------------------------------------------------------------------------
-- Setting the optimisation level

updOptLevel :: Int -> DynFlags -> DynFlags
872
-- ^ Sets the 'DynFlags' to be appropriate to the optimisation level
873
updOptLevel n dfs
874
  = dfs2{ optLevel = final_n }
875
  where
Ian Lynagh's avatar
Ian Lynagh committed
876
   final_n = max 0 (min 2 n)    -- Clamp to 0 <= n <= 2
877
878
879
   dfs1 = foldr (flip dopt_unset) dfs  remove_dopts
   dfs2 = foldr (flip dopt_set)   dfs1 extra_dopts

880
881
   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
882

883
884
optLevelFlags :: [([Int], DynFlag)]
optLevelFlags
Ian Lynagh's avatar
Ian Lynagh committed
885
  = [ ([0],     Opt_IgnoreInterfacePragmas)
886
    , ([0],     Opt_OmitInterfacePragmas)
887

Ian Lynagh's avatar
Ian Lynagh committed
888
    , ([1,2],   Opt_IgnoreAsserts)
889
890
    , ([1,2],   Opt_EnableRewriteRules)  -- Off for -O0; see Note [Scoping for Builtin rules]
                                         --              in PrelRules
Ian Lynagh's avatar
Ian Lynagh committed
891
892
893
894
895
    , ([1,2],   Opt_DoEtaReduction)
    , ([1,2],   Opt_CaseMerge)
    , ([1,2],   Opt_Strictness)
    , ([1,2],   Opt_CSE)
    , ([1,2],   Opt_FullLaziness)
896
897
    , ([1,2],   Opt_Specialise)
    , ([1,2],   Opt_FloatIn)
898

Ian Lynagh's avatar
Ian Lynagh committed
899
900
    , ([2],     Opt_LiberateCase)
    , ([2],     Opt_SpecConstr)
901
902
903
904
905
906
907
908
909
910

--     , ([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.
911
912

    , ([0,1,2], Opt_DoLambdaEtaExpansion)
Ian Lynagh's avatar
Ian Lynagh committed
913
914
915
916
                -- 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.
917
918
919
920
921
    ]

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

twanvl's avatar
twanvl committed
922
standardWarnings :: [DynFlag]
923
standardWarnings
Ian Lynagh's avatar
Ian Lynagh committed
924
    = [ Opt_WarnWarningsDeprecations,
925
        Opt_WarnDeprecatedFlags,
926
        Opt_WarnUnrecognisedPragmas,
Ian Lynagh's avatar
Ian Lynagh committed
927
928
929
        Opt_WarnOverlappingPatterns,
        Opt_WarnMissingFields,
        Opt_WarnMissingMethods,
930
        Opt_WarnDuplicateExports,
931
        Opt_WarnLazyUnliftedBindings,
932
933
        Opt_WarnDodgyForeignImports,
        Opt_WarnWrongDoBind
934
935
      ]

twanvl's avatar
twanvl committed
936
minusWOpts :: [DynFlag]
937
minusWOpts
Ian Lynagh's avatar
Ian Lynagh committed
938
939
940
941
942
    = standardWarnings ++
      [ Opt_WarnUnusedBinds,
        Opt_WarnUnusedMatches,
        Opt_WarnUnusedImports,
        Opt_WarnIncompletePatterns,
943
        Opt_WarnDodgyExports,
Ian Lynagh's avatar
Ian Lynagh committed
944
        Opt_WarnDodgyImports
945
946
      ]

twanvl's avatar
twanvl committed
947
minusWallOpts :: [DynFlag]
948
949
minusWallOpts
    = minusWOpts ++
Ian Lynagh's avatar
Ian Lynagh committed
950
951
952
953
      [ Opt_WarnTypeDefaults,
        Opt_WarnNameShadowing,
        Opt_WarnMissingSigs,
        Opt_WarnHiShadows,
954
955
        Opt_WarnOrphans,
        Opt_WarnUnusedDoBind
956
957
      ]

958
-- minuswRemovesOpts should be every warning option
twanvl's avatar
twanvl committed
959
minuswRemovesOpts :: [DynFlag]
960
961
962
963
964
965
minuswRemovesOpts
    = minusWallOpts ++
      [Opt_WarnImplicitPrelude,
       Opt_WarnIncompletePatternsRecUpd,
       Opt_WarnSimplePatterns,
       Opt_WarnMonomorphism,
966
       Opt_WarnUnrecognisedPragmas,
967
968
969
       Opt_WarnTabs
      ]

970
971
972
-- -----------------------------------------------------------------------------
-- CoreToDo:  abstraction of core-to-core passes to run.

Ian Lynagh's avatar
Ian Lynagh committed