DynFlags.hs 85.7 KB
Newer Older
1

2
-- |
3
4
5
6
7
8
-- Dynamic flags
--
--
-- (c) The University of Glasgow 2005
--

9
-- Most flags are dynamic flags, which means they can change from
10
11
12
-- 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.
13
module DynFlags (
14
        -- * Dynamic flags and associated configuration types
Ian Lynagh's avatar
Ian Lynagh committed
15
16
17
18
19
20
21
22
        DynFlag(..),
        DynFlags(..),
        HscTarget(..), isObjectTarget, defaultObjectTarget,
        GhcMode(..), isOneShot,
        GhcLink(..), isNoLink,
        PackageFlag(..),
        Option(..),
        DynLibLoader(..),
23
        fFlags, xFlags,
24
        dphPackage,
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
        getVerbFlag,
34
        getMainFun,
Ian Lynagh's avatar
Ian Lynagh committed
35
36
37
38
        updOptLevel,
        setTmpDir,
        setPackageName,

39
        -- ** Parsing DynFlags
Ian Lynagh's avatar
Ian Lynagh committed
40
        parseDynamicFlags,
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
import Module
Simon Marlow's avatar
Simon Marlow committed
66
import PackageConfig
67
68
69
import PrelNames        ( mAIN, main_RDR_Unqual )
import RdrName          ( RdrName, mkRdrUnqual )
import OccName          ( mkVarOccFS )
Simon Marlow's avatar
Simon Marlow committed
70
#ifdef i386_TARGET_ARCH
Ian Lynagh's avatar
Ian Lynagh committed
71
import StaticFlags      ( opt_Static )
Simon Marlow's avatar
Simon Marlow committed
72
#endif
Ian Lynagh's avatar
Ian Lynagh committed
73
74
import StaticFlags      ( opt_PIC, WayName(..), v_Ways, v_Build_tag,
                          v_RTS_Build_tag )
75
import {-# SOURCE #-} Packages (PackageState)
Ian Lynagh's avatar
Ian Lynagh committed
76
import DriverPhases     ( Phase(..), phaseInputExt )
77
78
import Config
import CmdLineParser
Ian Lynagh's avatar
Ian Lynagh committed
79
import Constants        ( mAX_CONTEXT_REDUCTION_DEPTH )
80
import Panic
81
import UniqFM           ( UniqFM )
82
import Util
83
import Maybes           ( orElse )
84
import SrcLoc
85
import FastString
Simon Marlow's avatar
Simon Marlow committed
86
87
import Outputable
import {-# SOURCE #-} ErrUtils ( Severity(..), Message, mkLocMessage )
88

Ian Lynagh's avatar
Ian Lynagh committed
89
90
import Data.IORef       ( readIORef )
import Control.Monad    ( when )
simonpj@microsoft.com's avatar
simonpj@microsoft.com committed
91

92
import Data.Char
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
117
118
119
120
121
   | Opt_D_dump_cpranal
   | Opt_D_dump_deriv
   | Opt_D_dump_ds
   | Opt_D_dump_flatC
   | Opt_D_dump_foreign
   | Opt_D_dump_inlinings
122
   | Opt_D_dump_rule_firings
123
124
125
126
127
   | Opt_D_dump_occur_anal
   | Opt_D_dump_parsed
   | Opt_D_dump_rn
   | Opt_D_dump_simpl
   | Opt_D_dump_simpl_iterations
128
   | Opt_D_dump_simpl_phases
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
   | 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
147
   | Opt_D_dump_hpc
148
149
150
151
152
153
   | 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
154
   | Opt_D_dump_mod_cycles
155
   | Opt_D_dump_view_pattern_commoning
156
   | Opt_D_faststring_stats
Ian Lynagh's avatar
Ian Lynagh committed
157
   | Opt_DumpToFile                     -- ^ Append dump output to files instead of stdout.
Simon Marlow's avatar
Simon Marlow committed
158
   | Opt_D_no_debug_output
159
160
161
   | Opt_DoCoreLinting
   | Opt_DoStgLinting
   | Opt_DoCmmLinting
Ben.Lippmeier@anu.edu.au's avatar
Ben.Lippmeier@anu.edu.au committed
162
   | Opt_DoAsmLinting
163

Ian Lynagh's avatar
Ian Lynagh committed
164
   | Opt_WarnIsError                    -- -Werror; makes warnings fatal
165
166
   | Opt_WarnDuplicateExports
   | Opt_WarnHiShadows
167
   | Opt_WarnImplicitPrelude
168
169
170
171
172
173
174
175
176
   | Opt_WarnIncompletePatterns
   | Opt_WarnIncompletePatternsRecUpd
   | Opt_WarnMissingFields
   | Opt_WarnMissingMethods
   | Opt_WarnMissingSigs
   | Opt_WarnNameShadowing
   | Opt_WarnOverlappingPatterns
   | Opt_WarnSimplePatterns
   | Opt_WarnTypeDefaults
177
   | Opt_WarnMonomorphism
178
179
180
   | Opt_WarnUnusedBinds
   | Opt_WarnUnusedImports
   | Opt_WarnUnusedMatches
Ian Lynagh's avatar
Ian Lynagh committed
181
   | Opt_WarnWarningsDeprecations
182
   | Opt_WarnDeprecatedFlags
183
184
   | Opt_WarnDodgyImports
   | Opt_WarnOrphans
185
   | Opt_WarnTabs
186
   | Opt_WarnUnrecognisedPragmas
187
   | Opt_WarnDodgyForeignImports
188
189

   -- language opts
190
191
192
   | Opt_OverlappingInstances
   | Opt_UndecidableInstances
   | Opt_IncoherentInstances
193
   | Opt_MonomorphismRestriction
194
   | Opt_MonoPatBinds
Ian Lynagh's avatar
Ian Lynagh committed
195
   | Opt_ExtendedDefaultRules           -- Use GHC's extended rules for defaulting
196
   | Opt_ForeignFunctionInterface
Ian Lynagh's avatar
Ian Lynagh committed
197
   | Opt_UnliftedFFITypes
Ian Lynagh's avatar
Ian Lynagh committed
198
199
   | Opt_PArr                           -- Syntactic support for parallel arrays
   | Opt_Arrows                         -- Arrow-notation syntax
200
   | Opt_TemplateHaskell
201
   | Opt_QuasiQuotes
202
   | Opt_ImplicitParams
203
   | Opt_Generics			-- "Derivable type classes"
Ian Lynagh's avatar
Ian Lynagh committed
204
   | Opt_ImplicitPrelude
205
   | Opt_ScopedTypeVariables
Ian Lynagh's avatar
Ian Lynagh committed
206
   | Opt_UnboxedTuples
simonpj@microsoft.com's avatar
simonpj@microsoft.com committed
207
   | Opt_BangPatterns
208
   | Opt_TypeFamilies
209
   | Opt_OverloadedStrings
210
   | Opt_DisambiguateRecordFields
211
   | Opt_RecordWildCards
212
   | Opt_RecordPuns
213
   | Opt_ViewPatterns
214
   | Opt_GADTs
215
   | Opt_RelaxedPolyRec
216
   | Opt_StandaloneDeriving
217
   | Opt_DeriveDataTypeable
218
   | Opt_TypeSynonymInstances
Ian Lynagh's avatar
Ian Lynagh committed
219
   | Opt_FlexibleContexts
220
   | Opt_FlexibleInstances
221
   | Opt_ConstrainedClassMethods
Ian Lynagh's avatar
Ian Lynagh committed
222
   | Opt_MultiParamTypeClasses
223
   | Opt_FunctionalDependencies
Ian Lynagh's avatar
Ian Lynagh committed
224
   | Opt_UnicodeSyntax
Ian Lynagh's avatar
Ian Lynagh committed
225
   | Opt_PolymorphicComponents
226
   | Opt_ExistentialQuantification
227
   | Opt_MagicHash
Ian Lynagh's avatar
Ian Lynagh committed
228
   | Opt_EmptyDataDecls
Ian Lynagh's avatar
Ian Lynagh committed
229
   | Opt_KindSignatures
Ian Lynagh's avatar
Ian Lynagh committed
230
   | Opt_ParallelListComp
231
   | Opt_TransformListComp
232
   | Opt_GeneralizedNewtypeDeriving
Ian Lynagh's avatar
Ian Lynagh committed
233
   | Opt_RecursiveDo
234
   | Opt_PostfixOperators
Ian Lynagh's avatar
Ian Lynagh committed
235
   | Opt_PatternGuards
236
   | Opt_LiberalTypeSynonyms
237
238
   | Opt_Rank2Types
   | Opt_RankNTypes
239
   | Opt_ImpredicativeTypes
Ian Lynagh's avatar
Ian Lynagh committed
240
   | Opt_TypeOperators
241
   | Opt_PackageImports
242

243
244
   | Opt_PrintExplicitForalls

245
246
247
   -- optimisation opts
   | Opt_Strictness
   | Opt_FullLaziness
248
   | Opt_StaticArgumentTransformation
249
   | Opt_CSE
250
251
   | Opt_LiberateCase
   | Opt_SpecConstr
252
253
254
255
256
257
258
   | Opt_IgnoreInterfacePragmas
   | Opt_OmitInterfacePragmas
   | Opt_DoLambdaEtaExpansion
   | Opt_IgnoreAsserts
   | Opt_DoEtaReduction
   | Opt_CaseMerge
   | Opt_UnboxStrictFields
259
   | Opt_MethodSharing
260
   | Opt_DictsCheap
261
   | Opt_EnableRewriteRules		-- Apply rewrite rules during simplification
rl@cse.unsw.edu.au's avatar
rl@cse.unsw.edu.au committed
262
   | Opt_Vectorise
Ian Lynagh's avatar
Ian Lynagh committed
263
264
   | Opt_RegsGraph                      -- do graph coloring register allocation
   | Opt_RegsIterative                  -- do iterative coalescing graph coloring register allocation
265
266
267
268

   -- misc opts
   | Opt_Cpp
   | Opt_Pp
269
   | Opt_ForceRecomp
270
271
272
273
274
275
276
   | Opt_DryRun
   | Opt_DoAsmMangling
   | Opt_ExcessPrecision
   | Opt_ReadUserPackageConf
   | Opt_NoHsMain
   | Opt_SplitObjs
   | Opt_StgStats
277
   | Opt_HideAllPackages
278
   | Opt_PrintBindResult
279
   | Opt_Haddock
David Waern's avatar
David Waern committed
280
   | Opt_HaddockOptions
281
   | Opt_Hpc_No_Auto
282
   | Opt_BreakOnException
283
   | Opt_BreakOnError
284
   | Opt_PrintEvldWithShow
285
   | Opt_PrintBindContents
286
287
   | Opt_GenManifest
   | Opt_EmbedManifest
288
289
   | Opt_RunCPSZ
   | Opt_ConvertToZipCfgAndBack
290
   | Opt_AutoLinkPackages
291
   | Opt_ImplicitImportQualified
292
293
294
295
296
297
298

   -- keeping stuff
   | Opt_KeepHiDiffs
   | Opt_KeepHcFiles
   | Opt_KeepSFiles
   | Opt_KeepRawSFiles
   | Opt_KeepTmpFiles
Jedai's avatar
Jedai committed
299
   | Opt_KeepRawTokenStream
300

301
   deriving (Eq, Show)
Ian Lynagh's avatar
Ian Lynagh committed
302

303
304
-- | 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
305
data DynFlags = DynFlags {
Ian Lynagh's avatar
Ian Lynagh committed
306
307
308
309
310
  ghcMode               :: GhcMode,
  ghcLink               :: GhcLink,
  coreToDo              :: Maybe [CoreToDo], -- reserved for -Ofile
  stgToDo               :: Maybe [StgToDo],  -- similarly
  hscTarget             :: HscTarget,
311
  hscOutName            :: String,      -- ^ Name of the output file
312
  extCoreName           :: String,      -- ^ Name of the .hcr output file
313
314
315
316
  verbosity             :: Int,         -- ^ Verbosity level: see "DynFlags#verbosity_levels"
  optLevel              :: Int,         -- ^ Optimisation level
  simplPhases           :: Int,         -- ^ Number of simplifier phases
  maxSimplIterations    :: Int,         -- ^ Max simplifier iterations
317
  shouldDumpSimplPhase  :: SimplifierMode -> Bool,
Ian Lynagh's avatar
Ian Lynagh committed
318
  ruleCheck             :: Maybe String,
319

320
321
322
  specConstrThreshold   :: Maybe Int,   -- ^ Threshold for SpecConstr
  specConstrCount       :: Maybe Int,   -- ^ Max number of specialisations for any one function
  liberateCaseThreshold :: Maybe Int,   -- ^ Threshold for LiberateCase
323

Ian Lynagh's avatar
Ian Lynagh committed
324
  stolen_x86_regs       :: Int,
325
  cmdlineHcIncludes     :: [String],    -- ^ @\-\#includes@
Ian Lynagh's avatar
Ian Lynagh committed
326
327
328
  importPaths           :: [FilePath],
  mainModIs             :: Module,
  mainFunIs             :: Maybe String,
329
  ctxtStkDepth          :: Int,         -- ^ Typechecker context stack depth
330

331
332
  dphBackend            :: DPHBackend,

333
  thisPackage           :: PackageId,   -- ^ name of package currently being compiled
334
335

  -- ways
336
337
338
  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
339

340
  -- paths etc.
Ian Lynagh's avatar
Ian Lynagh committed
341
342
343
  objectDir             :: Maybe String,
  hiDir                 :: Maybe String,
  stubDir               :: Maybe String,
344

Ian Lynagh's avatar
Ian Lynagh committed
345
346
347
  objectSuf             :: String,
  hcSuf                 :: String,
  hiSuf                 :: String,
348

Ian Lynagh's avatar
Ian Lynagh committed
349
350
351
  outputFile            :: Maybe String,
  outputHi              :: Maybe String,
  dynLibLoader          :: DynLibLoader,
352

353
  -- | This is set by 'DriverPipeline.runPipeline' based on where
Ian Lynagh's avatar
Ian Lynagh committed
354
355
  --    its output is going.
  dumpPrefix            :: Maybe FilePath,
356

357
358
  -- | Override the 'dumpPrefix' set by 'DriverPipeline.runPipeline'.
  --    Set by @-ddump-file-prefix@
Ian Lynagh's avatar
Ian Lynagh committed
359
360
361
362
363
364
365
366
  dumpPrefixForce       :: Maybe FilePath,

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

367
368
369
  ghcUsagePath          :: FilePath,    -- Filled in by SysTools
  ghciUsagePath         :: FilePath,    -- ditto

370
  hpcDir                :: String,      -- ^ Path to store the .mix files
andy@galois.com's avatar
andy@galois.com committed
371

372
  -- options for particular phases
Ian Lynagh's avatar
Ian Lynagh committed
373
374
375
376
377
378
379
380
  opt_L                 :: [String],
  opt_P                 :: [String],
  opt_F                 :: [String],
  opt_c                 :: [String],
  opt_m                 :: [String],
  opt_a                 :: [String],
  opt_l                 :: [String],
  opt_windres           :: [String],
381
382

  -- commands for particular phases
Ian Lynagh's avatar
Ian Lynagh committed
383
384
385
386
387
388
389
390
391
  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]),
392
393
  pgm_T                 :: String,
  pgm_sysman            :: String,
394
  pgm_windres           :: String,
395

396
397
398
399
400
401
402
  --  For ghc -M
  depMakefile           :: FilePath,
  depIncludePkgDeps     :: Bool,
  depExcludeMods        :: [ModuleName],
  depSuffixes           :: [String],
  depWarnings           :: Bool,

403
  --  Package flags
Ian Lynagh's avatar
Ian Lynagh committed
404
  extraPkgConfs         :: [FilePath],
405
406
  topDir                :: FilePath,    -- filled in by SysTools
  systemPackageConfig   :: FilePath,    -- ditto
407
        -- ^ The @-package-conf@ flags given on the command line, in the order
Ian Lynagh's avatar
Ian Lynagh committed
408
        -- they appeared.
409

Ian Lynagh's avatar
Ian Lynagh committed
410
  packageFlags          :: [PackageFlag],
411
        -- ^ The @-package@ and @-hide-package@ flags from the command-line
412

413
  -- Package state
Ian Lynagh's avatar
Ian Lynagh committed
414
  -- NB. do not modify this field, it is calculated by
415
  -- Packages.initPackages and Packages.updatePackages.
416
  pkgDatabase           :: Maybe (UniqFM PackageConfig),
Ian Lynagh's avatar
Ian Lynagh committed
417
  pkgState              :: PackageState,
418
419

  -- hsc dynamic flags
Ian Lynagh's avatar
Ian Lynagh committed
420
421
  flags                 :: [DynFlag],

422
  -- | Message output action: use "ErrUtils" instead of this if you can
David Waern's avatar
David Waern committed
423
424
425
  log_action            :: Severity -> SrcSpan -> PprStyle -> Message -> IO (),

  haddockOptions :: Maybe String
426
427
428
429
430
431
432
433
434
435
 }

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

436
-- | Will this target result in an object file on the disk?
437
438
439
440
441
442
443
444
445
446
447
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.
448
data GhcMode
449
450
451
  = CompManager         -- ^ @\-\-make@, GHCi, etc.
  | OneShot             -- ^ @ghc -c Foo.hs@
  | MkDepend            -- ^ @ghc -M@, see "Finder" for why we need this
452
453
  deriving Eq

454
455
456
457
458
instance Outputable GhcMode where
  ppr CompManager = ptext (sLit "CompManager")
  ppr OneShot     = ptext (sLit "OneShot")
  ppr MkDepend    = ptext (sLit "MkDepend")

459
460
461
462
isOneShot :: GhcMode -> Bool
isOneShot OneShot = True
isOneShot _other  = False

463
464
465
466
467
468
-- | 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
  | LinkInMemory        -- ^ Use the in-memory dynamic linker
  | LinkDynLib          -- ^ Link objects into a dynamic lib (DLL on Windows, DSO on ELF platforms)
469
  deriving (Eq, Show)
470
471
472

isNoLink :: GhcLink -> Bool
isNoLink NoLink = True
twanvl's avatar
twanvl committed
473
isNoLink _      = False
474
475
476
477
478

data PackageFlag
  = ExposePackage  String
  | HidePackage    String
  | IgnorePackage  String
479
  deriving Eq
480

twanvl's avatar
twanvl committed
481
defaultHscTarget :: HscTarget
482
483
defaultHscTarget = defaultObjectTarget

484
-- | The 'HscTarget' value corresponding to the default way to create
485
-- object files on the current platform.
twanvl's avatar
twanvl committed
486
defaultObjectTarget :: HscTarget
487
defaultObjectTarget
Ian Lynagh's avatar
Ian Lynagh committed
488
489
  | cGhcWithNativeCodeGen == "YES"      =  HscAsm
  | otherwise                           =  HscC
490

491
492
493
494
495
496
data DynLibLoader
  = Deployable
  | Wrapped (Maybe String)
  | SystemDependent
  deriving Eq

497
-- | Used by 'GHC.newSession' to partially initialize a new 'DynFlags' value
twanvl's avatar
twanvl committed
498
initDynFlags :: DynFlags -> IO DynFlags
499
500
501
502
503
504
initDynFlags dflags = do
 -- someday these will be dynamic flags
 ways <- readIORef v_Ways
 build_tag <- readIORef v_Build_tag
 rts_build_tag <- readIORef v_RTS_Build_tag
 return dflags{
Ian Lynagh's avatar
Ian Lynagh committed
505
506
507
508
        wayNames        = ways,
        buildTag        = build_tag,
        rtsBuildTag     = rts_build_tag
        }
509

510
511
-- | 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
512
defaultDynFlags :: DynFlags
513
514
defaultDynFlags =
     DynFlags {
Ian Lynagh's avatar
Ian Lynagh committed
515
516
517
518
519
520
521
522
523
        ghcMode                 = CompManager,
        ghcLink                 = LinkBinary,
        coreToDo                = Nothing,
        stgToDo                 = Nothing,
        hscTarget               = defaultHscTarget,
        hscOutName              = "",
        extCoreName             = "",
        verbosity               = 0,
        optLevel                = 0,
524
        simplPhases             = 2,
Ian Lynagh's avatar
Ian Lynagh committed
525
        maxSimplIterations      = 4,
526
        shouldDumpSimplPhase    = const False,
Ian Lynagh's avatar
Ian Lynagh committed
527
528
529
        ruleCheck               = Nothing,
        specConstrThreshold     = Just 200,
        specConstrCount         = Just 3,
530
        liberateCaseThreshold   = Just 200,
Ian Lynagh's avatar
Ian Lynagh committed
531
532
533
534
535
536
537
        stolen_x86_regs         = 4,
        cmdlineHcIncludes       = [],
        importPaths             = ["."],
        mainModIs               = mAIN,
        mainFunIs               = Nothing,
        ctxtStkDepth            = mAX_CONTEXT_REDUCTION_DEPTH,

538
539
        dphBackend              = DPHPar,

Ian Lynagh's avatar
Ian Lynagh committed
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
        thisPackage             = mainPackageId,

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

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

        outputFile              = Nothing,
        outputHi                = Nothing,
        dynLibLoader            = Deployable,
        dumpPrefix              = Nothing,
        dumpPrefixForce         = Nothing,
        includePaths            = [],
        libraryPaths            = [],
        frameworkPaths          = [],
        cmdlineFrameworks       = [],
        tmpDir                  = cDEFAULT_TMPDIR,

        hpcDir                  = ".hpc",

        opt_L                   = [],
        opt_P                   = (if opt_PIC
                                   then ["-D__PIC__"]
                                   else []),
        opt_F                   = [],
        opt_c                   = [],
        opt_a                   = [],
        opt_m                   = [],
        opt_l                   = [],
572
        opt_windres             = [],
Ian Lynagh's avatar
Ian Lynagh committed
573
574
575

        extraPkgConfs           = [],
        packageFlags            = [],
576
577
        pkgDatabase             = Nothing,
        pkgState                = panic "no package state yet: call GHC.setSessionDynFlags",
Ian Lynagh's avatar
Ian Lynagh committed
578
579
580
581
582
583
584
        wayNames                = panic "defaultDynFlags: No wayNames",
        buildTag                = panic "defaultDynFlags: No buildTag",
        rtsBuildTag             = panic "defaultDynFlags: No rtsBuildTag",
        -- initSysTools fills all these in
        ghcUsagePath            = panic "defaultDynFlags: No ghciUsagePath",
        ghciUsagePath           = panic "defaultDynFlags: No ghciUsagePath",
        topDir                  = panic "defaultDynFlags: No topDir",
585
        systemPackageConfig     = panic  "no systemPackageConfig: call GHC.setSessionDynFlags",
Ian Lynagh's avatar
Ian Lynagh committed
586
587
588
589
590
591
592
593
594
595
596
597
598
        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
599
600
601
602
603
604
605
        -- ghc -M values
        depMakefile       = "Makefile",
        depIncludePkgDeps = False,
        depExcludeMods    = [],
        depSuffixes       = [],
        depWarnings       = True,
        -- end of ghc -M values
Ian Lynagh's avatar
Ian Lynagh committed
606
        haddockOptions = Nothing,
607
        flags = [
608
            Opt_AutoLinkPackages,
609
610
611
612
613
614
615
616
617
            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,

618
619
            Opt_MethodSharing,

620
621
            Opt_DoAsmMangling,

622
            Opt_GenManifest,
623
624
            Opt_EmbedManifest,
            Opt_PrintBindContents
625
626
627
628
629
            ]
            ++ [f | (ns,f) <- optLevelFlags, 0 `elem` ns]
                    -- The default -O0 options
            ++ standardWarnings,

Ian Lynagh's avatar
Ian Lynagh committed
630
        log_action = \severity srcSpan style msg ->
631
                        case severity of
632
633
634
635
636
637
638
639
                          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.
640
641
      }

Ian Lynagh's avatar
Ian Lynagh committed
642
{-
643
    #verbosity_levels#
644
    Verbosity levels:
Ian Lynagh's avatar
Ian Lynagh committed
645
646

    0   |   print errors & warnings only
647
648
649
650
651
652
653
    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"
-}

654
-- | Test whether a 'DynFlag' is set
655
656
657
dopt :: DynFlag -> DynFlags -> Bool
dopt f dflags  = f `elem` (flags dflags)

658
-- | Set a 'DynFlag'
659
660
661
dopt_set :: DynFlags -> DynFlag -> DynFlags
dopt_set dfs f = dfs{ flags = f : flags dfs }

662
-- | Unset a 'DynFlag'
663
664
665
dopt_unset :: DynFlags -> DynFlag -> DynFlags
dopt_unset dfs f = dfs{ flags = filter (/= f) (flags dfs) }

666
667
668
669
-- | 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
670
getOpts dflags opts = reverse (opts dflags)
Ian Lynagh's avatar
Ian Lynagh committed
671
        -- We add to the options from the front, so we need to reverse the list
672

673
674
-- | 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
675
getVerbFlag :: DynFlags -> String
Ian Lynagh's avatar
Ian Lynagh committed
676
677
getVerbFlag dflags
  | verbosity dflags >= 3  = "-v"
678
679
  | otherwise =  ""

twanvl's avatar
twanvl committed
680
681
setObjectDir, setHiDir, setStubDir, setObjectSuf, setHiSuf, setHcSuf, parseDynLibLoaderMode,
         setPgmP, setPgmL, setPgmF, setPgmc, setPgmm, setPgms, setPgma, setPgml, setPgmdll, setPgmwindres,
682
         addOptL, addOptP, addOptF, addOptc, addOptm, addOpta, addOptl, addOptwindres,
twanvl's avatar
twanvl committed
683
684
685
686
687
         addCmdlineFramework, addHaddockOpts
   :: String -> DynFlags -> DynFlags
setOutputFile, setOutputHi, setDumpPrefixForce
   :: Maybe String -> DynFlags -> DynFlags

688
689
690
691
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
692
  -- \#included from the .hc file when compiling with -fvia-C.
693

694
695
setObjectSuf  f d = d{ objectSuf  = f}
setHiSuf      f d = d{ hiSuf      = f}
696
697
698
699
setHcSuf      f d = d{ hcSuf      = f}

setOutputFile f d = d{ outputFile = f}
setOutputHi   f d = d{ outputHi   = f}
700

701
702
703
704
705
706
707
708
709
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) }
   (_,_)                -> error "Unknown dynlib loader"

710
711
setDumpPrefixForce f d = d { dumpPrefixForce = f}

712
713
714
715
716
717
718
719
720
721
722
723
-- 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,[])}
724
setPgmwindres f d = d{ pgm_windres = f}
725
726
727
728
729
730
731
732

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}
733
addOptwindres f d = d{ opt_windres = f : opt_windres d}
734

735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
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 }

setDepWarnings :: Bool -> DynFlags -> DynFlags
setDepWarnings b d = d { depWarnings = b }

-- 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
deOptDep x = case maybePrefixMatch "-optdep" x of
             Just rest -> rest
             Nothing -> x

759
760
addCmdlineFramework f d = d{ cmdlineFrameworks = f : cmdlineFrameworks d}

David Waern's avatar
David Waern committed
761
762
addHaddockOpts f d = d{ haddockOptions = Just f}

763
764
765
-- -----------------------------------------------------------------------------
-- Command-line options

766
-- | When invoking external tools as part of the compilation pipeline, we
767
768
-- 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
769
-- between filepaths and 'other stuff'. The reason for this is that
770
-- this type gives us a handle on transforming filenames, and filenames only,
771
-- to whatever format they're expected to be on a particular platform.
772
773
data Option
 = FileOption -- an entry that _contains_ filename(s) / filepaths.
Ian Lynagh's avatar
Ian Lynagh committed
774
775
776
              String  -- a non-filepath prefix that shouldn't be
                      -- transformed (e.g., "/out=")
              String  -- the filepath/filename portion
777
 | Option     String
Ian Lynagh's avatar
Ian Lynagh committed
778

779
780
781
782
-----------------------------------------------------------------------------
-- Setting the optimisation level

updOptLevel :: Int -> DynFlags -> DynFlags
783
-- ^ Sets the 'DynFlags' to be appropriate to the optimisation level
784
updOptLevel n dfs
785
  = dfs2{ optLevel = final_n }
786
  where
Ian Lynagh's avatar
Ian Lynagh committed
787
   final_n = max 0 (min 2 n)    -- Clamp to 0 <= n <= 2
788
789
790
   dfs1 = foldr (flip dopt_unset) dfs  remove_dopts
   dfs2 = foldr (flip dopt_set)   dfs1 extra_dopts

791
792
   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
793

794
795
optLevelFlags :: [([Int], DynFlag)]
optLevelFlags
Ian Lynagh's avatar
Ian Lynagh committed
796
  = [ ([0],     Opt_IgnoreInterfacePragmas)
797
    , ([0],     Opt_OmitInterfacePragmas)
798

Ian Lynagh's avatar
Ian Lynagh committed
799
    , ([1,2],   Opt_IgnoreAsserts)
800
801
    , ([1,2],   Opt_EnableRewriteRules)  -- Off for -O0; see Note [Scoping for Builtin rules]
                                         --              in PrelRules
Ian Lynagh's avatar
Ian Lynagh committed
802
803
804
805
806
    , ([1,2],   Opt_DoEtaReduction)
    , ([1,2],   Opt_CaseMerge)
    , ([1,2],   Opt_Strictness)
    , ([1,2],   Opt_CSE)
    , ([1,2],   Opt_FullLaziness)
807

Ian Lynagh's avatar
Ian Lynagh committed
808
809
    , ([2],     Opt_LiberateCase)
    , ([2],     Opt_SpecConstr)
810
811
812
813
814
815
816
817
818
819

--     , ([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.
820
821

    , ([0,1,2], Opt_DoLambdaEtaExpansion)
Ian Lynagh's avatar
Ian Lynagh committed
822
823
824
825
                -- 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.
826
827
828
829
830
    ]

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

twanvl's avatar
twanvl committed
831
standardWarnings :: [DynFlag]
832
standardWarnings
Ian Lynagh's avatar
Ian Lynagh committed
833
    = [ Opt_WarnWarningsDeprecations,
834
        Opt_WarnDeprecatedFlags,
835
        Opt_WarnUnrecognisedPragmas,
Ian Lynagh's avatar
Ian Lynagh committed
836
837
838
        Opt_WarnOverlappingPatterns,
        Opt_WarnMissingFields,
        Opt_WarnMissingMethods,
839
840
        Opt_WarnDuplicateExports,
        Opt_WarnDodgyForeignImports
841
842
      ]

twanvl's avatar
twanvl committed
843
minusWOpts :: [DynFlag]
844
minusWOpts
Ian Lynagh's avatar
Ian Lynagh committed
845
846
847
848
849
850
    = standardWarnings ++
      [ Opt_WarnUnusedBinds,
        Opt_WarnUnusedMatches,
        Opt_WarnUnusedImports,
        Opt_WarnIncompletePatterns,
        Opt_WarnDodgyImports
851
852
      ]

twanvl's avatar
twanvl committed
853
minusWallOpts :: [DynFlag]
854
855
minusWallOpts
    = minusWOpts ++
Ian Lynagh's avatar
Ian Lynagh committed
856
857
858
859
860
      [ Opt_WarnTypeDefaults,
        Opt_WarnNameShadowing,
        Opt_WarnMissingSigs,
        Opt_WarnHiShadows,
        Opt_WarnOrphans
861
862
      ]

863
-- minuswRemovesOpts should be every warning option
twanvl's avatar
twanvl committed
864
minuswRemovesOpts :: [DynFlag]
865
866
867
868
869
870
minuswRemovesOpts
    = minusWallOpts ++
      [Opt_WarnImplicitPrelude,
       Opt_WarnIncompletePatternsRecUpd,
       Opt_WarnSimplePatterns,
       Opt_WarnMonomorphism,
871
       Opt_WarnUnrecognisedPragmas,
872
873
874
       Opt_WarnTabs
      ]

875
876
877
-- -----------------------------------------------------------------------------
-- CoreToDo:  abstraction of core-to-core passes to run.

Ian Lynagh's avatar
Ian Lynagh committed
878
879
880
data CoreToDo           -- These are diff core-to-core passes,
                        -- which may be invoked in any order,
                        -- as many times as you like.
881

Ian Lynagh's avatar
Ian Lynagh committed
882
883
884
885
886
  = CoreDoSimplify      -- The core-to-core simplifier.
        SimplifierMode
        [SimplifierSwitch]
                        -- Each run of the simplifier can take a different
                        -- set of simplifier-specific flags.
887
888
889
890
891
892
893
894
895
896
897
898
  | CoreDoFloatInwards
  | CoreDoFloatOutwards FloatOutSwitches
  | CoreLiberateCase
  | CoreDoPrintCore
  | CoreDoStaticArgs
  | CoreDoStrictness
  | CoreDoWorkerWrapper
  | CoreDoSpecialising
  | CoreDoSpecConstr
  | CoreDoOldStrictness
  | CoreDoGlomBinds
  | CoreCSE
Ian Lynagh's avatar
Ian Lynagh committed
899
900
  | CoreDoRuleCheck Int{-CompilerPhase-} String -- Check for non-application of rules
                                                -- matching this string
901
  | CoreDoVectorisation PackageId
Ian Lynagh's avatar
Ian Lynagh committed
902
903
  | CoreDoNothing                -- Useful when building up
  | CoreDoPasses [CoreToDo]      -- lists of these things
904

Ian Lynagh's avatar
Ian Lynagh committed
905
data SimplifierMode             -- See comments in SimplMonad
906
  = SimplGently
907
  | SimplPhase Int [String]
908
909
910
911
912
913

data SimplifierSwitch
  = MaxSimplifierIterations Int
  | NoCaseOfCase

data FloatOutSwitches
Ian Lynagh's avatar
Ian Lynagh committed
914
915
916
  = FloatOutSw  Bool    -- True <=> float lambdas to top level
                Bool    -- True <=> float constants to top level,
                        --          even if they do not escape a lambda
917
918
919


-- The core-to-core pass ordering is derived from the DynFlags:
920
921
runWhen :: Bool -> CoreToDo -> CoreToDo
runWhen True  do_this = do_this
twanvl's avatar
twanvl committed
922
runWhen False _       = CoreDoNothing
923

924
925
926
927
runMaybe :: Maybe a -> (a -> CoreToDo) -> CoreToDo
runMaybe (Just x) f = f x
runMaybe Nothing  _ = CoreDoNothing

928
929
930
931
932
getCoreToDo :: DynFlags -> [CoreToDo]
getCoreToDo dflags
  | Just todo <- coreToDo dflags = todo -- set explicitly by user
  | otherwise = core_todo
  where
Ian Lynagh's avatar
Ian Lynagh committed
933
    opt_level     = optLevel dflags
934
    phases        = simplPhases dflags
Ian Lynagh's avatar
Ian Lynagh committed
935
    max_iter      = maxSimplIterations dflags
936
937
938
    strictness    = dopt Opt_Strictness dflags
    full_laziness = dopt Opt_FullLaziness dflags
    cse           = dopt Opt_CSE dflags
939
940
    spec_constr   = dopt Opt_SpecConstr dflags
    liberate_case = dopt Opt_LiberateCase dflags
941
    rule_check    = ruleCheck dflags
942
    static_args   = dopt Opt_StaticArgumentTransformation dflags
943

944
    maybe_rule_check phase = runMaybe rule_check (CoreDoRuleCheck phase)
945

946
947
948
949
950
951
952
    simpl_phase phase names iter
      = CoreDoPasses
          [ CoreDoSimplify (SimplPhase phase names) [
              MaxSimplifierIterations iter
            ],
            maybe_rule_check phase
          ]
953

954
955
    vectorisation
      = runWhen (dopt Opt_Vectorise dflags)
956
        $ CoreDoPasses [ simpl_gently, CoreDoVectorisation (dphPackage dflags) ]
957
958


959
960
                -- By default, we have 2 phases before phase 0.

Ian Lynagh's avatar
Ian Lynagh committed
961
962
963
964
                -- Want to run with inline phase 2 after the specialiser to give
                -- maximum chance for fusion to work before we inline build/augment
                -- in phase 1.  This made a difference in 'ansi' where an
                -- overloaded function wasn't inlined till too late.
965

Ian Lynagh's avatar
Ian Lynagh committed
966
967
968
969
                -- Need phase 1 so that build/augment get
                -- inlined.  I found that spectral/hartel/genfft lost some useful
                -- strictness in the function sumcode' if augment is not inlined
                -- before strictness analysis runs
970
    simpl_phases = CoreDoPasses [ simpl_phase phase ["main"] max_iter
971
972
                                  | phase <- [phases, phases-1 .. 1] ]

973

Ian Lynagh's avatar
Ian Lynagh committed
974
        -- initial simplify: mk specialiser happy: minimum effort please
975
    simpl_gently = CoreDoSimplify SimplGently [
Ian Lynagh's avatar
Ian Lynagh committed
976
977
978
979
980
981
982
983
984
985
986
987
988
989
                        --      Simplify "gently"
                        -- Don't inline anything till full laziness has bitten
                        -- In particular, inlining wrappers inhibits floating
                        -- e.g. ...(case f x of ...)...
                        --  ==> ...(case (case x of I# x# -> fw x#) of ...)...
                        --  ==> ...(case x of I# x# -> case fw x# of ...)...
                        -- and now the redex (f x) isn't floatable any more
                        -- Similarly, don't apply any rules until after full
                        -- laziness.  Notably, list fusion can prevent floating.

            NoCaseOfCase,       -- Don't do case-of-case transformations.
                                -- This makes full laziness work better
            MaxSimplifierIterations max_iter
        ]
990

rl@cse.unsw.edu.au's avatar
rl@cse.unsw.edu.au committed
991
    core_todo =
992
     if opt_level == 0 then
993
       [vectorisation,
rl@cse.unsw.edu.au's avatar
rl@cse.unsw.edu.au committed
994
        simpl_phase 0 ["final"] max_iter]
Ian Lynagh's avatar
Ian Lynagh committed
995
     else {- opt_level >= 1 -} [
996

997
998
999
1000
    -- We want to do the static argument transform before full laziness as it
    -- may expose extra opportunities to float things outwards. However, to fix
    -- up the output of the transformation we need at do at least one simplify
    -- after this before anything else
1001
        runWhen static_args (CoreDoPasses [ simpl_gently, CoreDoStaticArgs ]),
1002

1003
1004
        -- We run vectorisation here for now, but we might also try to run
        -- it later
1005
1006
1007
1008
        vectorisation,

        -- initial simplify: mk specialiser happy: minimum effort please
        simpl_gently,
1009

Ian Lynagh's avatar
Ian Lynagh committed
1010
1011
1012
        -- Specialisation is best done before full laziness
        -- so that overloaded functions have all their dictionary lambdas manifest
        CoreDoSpecialising,
1013

Ian Lynagh's avatar
Ian Lynagh committed
1014
        runWhen full_laziness (CoreDoFloatOutwards (FloatOutSw False False)),
1015

Ian Lynagh's avatar
Ian Lynagh committed
1016
        CoreDoFloatInwards,
1017

1018
        simpl_phases,
1019

Ian Lynagh's avatar
Ian Lynagh committed
1020
1021
                -- Phase 0: allow all Ids to be inlined now
                -- This gets foldr inlined before strictness analysis
1022

Ian Lynagh's avatar
Ian Lynagh committed
1023
1024
1025
1026
1027
1028
1029
1030
                -- At least 3 iterations because otherwise we land up with
                -- huge dead expressions because of an infelicity in the
                -- simpifier.
                --      let k = BIG in foldr k z xs
                -- ==>  let k = BIG in letrec go = \xs -> ...(k x).... in go xs
                -- ==>  let k = BIG in letrec go = \xs -> ...(BIG x).... in go xs
                -- Don't stop now!
        simpl_phase 0 ["main"] (max max_iter 3),
1031
1032
1033


#ifdef OLD_STRICTNESS
Ian Lynagh's avatar
Ian Lynagh committed
1034
        CoreDoOldStrictness,
1035
#endif
Ian Lynagh's avatar
Ian Lynagh committed
1036
1037
1038
1039
        runWhen strictness (CoreDoPasses [
                CoreDoStrictness,
                CoreDoWorkerWrapper,
                CoreDoGlomBinds,
1040
                simpl_phase 0 ["post-worker-wrapper"] max_iter
1041
                ]),
1042

Ian Lynagh's avatar
Ian Lynagh committed
1043
1044
1045
1046
1047
1048
1049
1050
        runWhen full_laziness
          (CoreDoFloatOutwards (FloatOutSw False    -- Not lambdas
                                           True)),  -- Float constants
                -- nofib/spectral/hartel/wang doubles in speed if you
                -- do full laziness late in the day.  It only happens
                -- after fusion and other stuff, so the early pass doesn't
                -- catch it.  For the record, the redex is
                --        f_el22 (f_el21 r_midblock)
simonmar's avatar