+
{-# OPTIONS -fno-warn-missing-fields #-}
-----------------------------------------------------------------------------
--
-- Dynamic flags
DynFlag(..),
DynFlags(..),
- HscTarget(..),
+ HscTarget(..), isObjectTarget,
GhcMode(..), isOneShot,
GhcLink(..), isNoLink,
PackageFlag(..),
| Opt_D_dump_hi
| Opt_D_dump_hi_diffs
| Opt_D_dump_minimal_imports
+ | Opt_D_dump_mod_cycles
| Opt_D_faststring_stats
| Opt_DoCoreLinting
| Opt_DoStgLinting
| Opt_Strictness
| Opt_FullLaziness
| Opt_CSE
+ | Opt_LiberateCase
+ | Opt_SpecConstr
| Opt_IgnoreInterfacePragmas
| Opt_OmitInterfacePragmas
| Opt_DoLambdaEtaExpansion
optLevel :: Int, -- optimisation level
maxSimplIterations :: Int, -- max simplifier iterations
ruleCheck :: Maybe String,
- libCaseThreshold :: Int, -- Threshold for liberate-case
+
+ specThreshold :: Int, -- Threshold for function specialisation
stolen_x86_regs :: Int,
cmdlineHcIncludes :: [String], -- -#includes
| HscNothing
deriving (Eq, Show)
+-- | will this target result in an object file on the disk?
+isObjectTarget :: HscTarget -> Bool
+isObjectTarget HscC = True
+isObjectTarget HscAsm = True
+isObjectTarget _ = False
+
+-- | The 'GhcMode' tells us whether we're doing multi-module
+-- compilation (controlled via the "GHC" API) or one-shot
+-- (single-module) compilation. This makes a difference primarily to
+-- the "Finder": in one-shot mode we look for interface files for
+-- imported modules, but in multi-module mode we look for source files
+-- in order to check whether they need to be recompiled.
data GhcMode
- = BatchCompile -- | @ghc --make Main@
- | Interactive -- | @ghc --interactive@
- | OneShot -- | @ghc -c Foo.hs@
- | JustTypecheck -- | Development environemnts, refactorer, etc.
- | MkDepend
+ = CompManager -- ^ --make, GHCi, etc.
+ | OneShot -- ^ ghc -c Foo.hs
+ | MkDepend -- ^ ghc -M, see Finder for why we need this
deriving Eq
isOneShot :: GhcMode -> Bool
isOneShot OneShot = True
isOneShot _other = False
+-- | What kind of linking to do.
data GhcLink -- What to do in the link step, if there is one
- = -- Only relevant for modes
- -- DoMake and StopBefore StopLn
- NoLink -- Don't link at all
- | StaticLink -- Ordinary linker [the default]
+ = NoLink -- Don't link at all
+ | LinkBinary -- Link object code into a binary
+ | LinkInMemory -- Use the in-memory dynamic linker
| MkDLL -- Make a DLL
+ deriving Eq
isNoLink :: GhcLink -> Bool
isNoLink NoLink = True
defaultDynFlags =
DynFlags {
- ghcMode = OneShot,
- ghcLink = StaticLink,
+ ghcMode = CompManager,
+ ghcLink = LinkBinary,
coreToDo = Nothing,
stgToDo = Nothing,
hscTarget = defaultHscTarget,
optLevel = 0,
maxSimplIterations = 4,
ruleCheck = Nothing,
- libCaseThreshold = 20,
+ specThreshold = 200,
stolen_x86_regs = 4,
cmdlineHcIncludes = [],
importPaths = ["."],
Opt_ImplicitPrelude,
Opt_MonomorphismRestriction,
- Opt_Strictness,
- -- strictness is on by default, but this only
- -- applies to -O.
- Opt_CSE, -- similarly for CSE.
- Opt_FullLaziness, -- ...and for full laziness
-
- Opt_DoLambdaEtaExpansion,
- -- This one is important for a tiresome reason:
- -- we want to make sure that the bindings for data
- -- constructors are eta-expanded. This is probably
- -- a good thing anyway, but it seems fragile.
-
+
Opt_DoAsmMangling,
- -- and the default no-optimisation options:
- Opt_IgnoreInterfacePragmas,
- Opt_OmitInterfacePragmas,
-
-- on by default:
- Opt_PrintBindResult
- ] ++ standardWarnings,
+ Opt_PrintBindResult ]
+ ++ [f | (ns,f) <- optLevelFlags, 0 `elem` ns]
+ -- The default -O0 options
+ ++ standardWarnings,
log_action = \severity srcSpan style msg ->
case severity of
dfs1 = foldr (flip dopt_unset) dfs remove_dopts
dfs2 = foldr (flip dopt_set) dfs1 extra_dopts
- extra_dopts
- | n == 0 = opt_0_dopts
- | otherwise = opt_1_dopts
-
- remove_dopts
- | n == 0 = opt_1_dopts
- | otherwise = opt_0_dopts
+ extra_dopts = [ f | (ns,f) <- optLevelFlags, n `elem` ns ]
+ remove_dopts = [ f | (ns,f) <- optLevelFlags, n `notElem` ns ]
-opt_0_dopts = [
- Opt_IgnoreInterfacePragmas,
- Opt_OmitInterfacePragmas
+optLevelFlags :: [([Int], DynFlag)]
+optLevelFlags
+ = [ ([0], Opt_IgnoreInterfacePragmas)
+ , ([0], Opt_OmitInterfacePragmas)
+ , ([1,2], Opt_IgnoreAsserts)
+ , ([1,2], Opt_DoEtaReduction)
+ , ([1,2], Opt_CaseMerge)
+ , ([1,2], Opt_Strictness)
+ , ([1,2], Opt_CSE)
+ , ([1,2], Opt_FullLaziness)
+ , ([2], Opt_LiberateCase)
+ , ([2], Opt_SpecConstr)
+
+ , ([0,1,2], Opt_DoLambdaEtaExpansion)
+ -- This one is important for a tiresome reason:
+ -- we want to make sure that the bindings for data
+ -- constructors are eta-expanded. This is probably
+ -- a good thing anyway, but it seems fragile.
]
-opt_1_dopts = [
- Opt_IgnoreAsserts,
- Opt_DoEtaReduction,
- Opt_CaseMerge
- ]
-
-- -----------------------------------------------------------------------------
-- Standard sets of warning options
| CoreCSE
| CoreDoRuleCheck Int{-CompilerPhase-} String -- Check for non-application of rules
-- matching this string
-
- | CoreDoNothing -- useful when building up lists of these things
+ | CoreDoNothing -- Useful when building up
+ | CoreDoPasses [CoreToDo] -- lists of these things
data SimplifierMode -- See comments in SimplMonad
= SimplGently
-- The core-to-core pass ordering is derived from the DynFlags:
+runWhen :: Bool -> CoreToDo -> CoreToDo
+runWhen True do_this = do_this
+runWhen False do_this = CoreDoNothing
getCoreToDo :: DynFlags -> [CoreToDo]
getCoreToDo dflags
strictness = dopt Opt_Strictness dflags
full_laziness = dopt Opt_FullLaziness dflags
cse = dopt Opt_CSE dflags
+ spec_constr = dopt Opt_SpecConstr dflags
+ liberate_case = dopt Opt_LiberateCase dflags
rule_check = ruleCheck dflags
core_todo =
-- so that overloaded functions have all their dictionary lambdas manifest
CoreDoSpecialising,
- if full_laziness then CoreDoFloatOutwards (FloatOutSw False False)
- else CoreDoNothing,
+ runWhen full_laziness (CoreDoFloatOutwards (FloatOutSw False False)),
CoreDoFloatInwards,
case rule_check of { Just pat -> CoreDoRuleCheck 0 pat; Nothing -> CoreDoNothing },
#ifdef OLD_STRICTNESS
- CoreDoOldStrictness
+ CoreDoOldStrictness,
#endif
- if strictness then CoreDoStrictness else CoreDoNothing,
- CoreDoWorkerWrapper,
- CoreDoGlomBinds,
-
- CoreDoSimplify (SimplPhase 0) [
- MaxSimplifierIterations max_iter
- ],
-
- if full_laziness then
- CoreDoFloatOutwards (FloatOutSw False -- Not lambdas
- True) -- Float constants
- else CoreDoNothing,
+ runWhen strictness (CoreDoPasses [
+ CoreDoStrictness,
+ CoreDoWorkerWrapper,
+ CoreDoGlomBinds,
+ CoreDoSimplify (SimplPhase 0) [
+ MaxSimplifierIterations max_iter
+ ]]),
+
+ 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
-- f_el22 (f_el21 r_midblock)
- -- We want CSE to follow the final full-laziness pass, because it may
- -- succeed in commoning up things floated out by full laziness.
- -- CSE used to rely on the no-shadowing invariant, but it doesn't any more
-
- if cse then CoreCSE else CoreDoNothing,
+ runWhen cse CoreCSE,
+ -- We want CSE to follow the final full-laziness pass, because it may
+ -- succeed in commoning up things floated out by full laziness.
+ -- CSE used to rely on the no-shadowing invariant, but it doesn't any more
CoreDoFloatInwards,
--- Case-liberation for -O2. This should be after
--- strictness analysis and the simplification which follows it.
-
- case rule_check of { Just pat -> CoreDoRuleCheck 0 pat; Nothing -> CoreDoNothing }
- ]
-
- ++
+ case rule_check of { Just pat -> CoreDoRuleCheck 0 pat; Nothing -> CoreDoNothing },
- (if opt_level >= 2 then
- [ CoreLiberateCase,
- CoreDoSimplify (SimplPhase 0) [
+ -- Case-liberation for -O2. This should be after
+ -- strictness analysis and the simplification which follows it.
+ runWhen liberate_case (CoreDoPasses [
+ CoreLiberateCase,
+ CoreDoSimplify (SimplPhase 0) [
MaxSimplifierIterations max_iter
- ], -- Run the simplifier after LiberateCase to vastly
+ ] ]), -- Run the simplifier after LiberateCase to vastly
-- reduce the possiblility of shadowing
-- Reason: see Note [Shadowing] in SpecConstr.lhs
- CoreDoSpecConstr
- ]
- else
- [])
- ++
+ runWhen spec_constr CoreDoSpecConstr,
-- Final clean-up simplification:
- [ CoreDoSimplify (SimplPhase 0) [
+ CoreDoSimplify (SimplPhase 0) [
MaxSimplifierIterations max_iter
]
]
, ( "ddump-rules", setDumpFlag Opt_D_dump_rules)
, ( "ddump-cse", setDumpFlag Opt_D_dump_cse)
, ( "ddump-worker-wrapper", setDumpFlag Opt_D_dump_worker_wrapper)
- , ( "ddump-rn-trace", NoArg (setDynFlag Opt_D_dump_rn_trace))
- , ( "ddump-if-trace", NoArg (setDynFlag Opt_D_dump_if_trace))
+ , ( "ddump-rn-trace", setDumpFlag Opt_D_dump_rn_trace)
+ , ( "ddump-if-trace", setDumpFlag Opt_D_dump_if_trace)
, ( "ddump-tc-trace", setDumpFlag Opt_D_dump_tc_trace)
, ( "ddump-splices", setDumpFlag Opt_D_dump_splices)
- , ( "ddump-rn-stats", NoArg (setDynFlag Opt_D_dump_rn_stats))
+ , ( "ddump-rn-stats", setDumpFlag Opt_D_dump_rn_stats)
, ( "ddump-opt-cmm", setDumpFlag Opt_D_dump_opt_cmm)
, ( "ddump-simpl-stats", setDumpFlag Opt_D_dump_simpl_stats)
, ( "ddump-bcos", setDumpFlag Opt_D_dump_BCOs)
, ( "dsource-stats", setDumpFlag Opt_D_source_stats)
, ( "dverbose-core2core", setDumpFlag Opt_D_verbose_core2core)
, ( "dverbose-stg2stg", setDumpFlag Opt_D_verbose_stg2stg)
- , ( "ddump-hi-diffs", NoArg (setDynFlag Opt_D_dump_hi_diffs))
+ , ( "ddump-hi-diffs", setDumpFlag Opt_D_dump_hi_diffs)
, ( "ddump-hi", setDumpFlag Opt_D_dump_hi)
, ( "ddump-minimal-imports", setDumpFlag Opt_D_dump_minimal_imports)
, ( "ddump-vect", setDumpFlag Opt_D_dump_vect)
, ( "ddump-hpc", setDumpFlag Opt_D_dump_hpc)
+ , ( "ddump-mod-cycles", setDumpFlag Opt_D_dump_mod_cycles)
, ( "dcore-lint", NoArg (setDynFlag Opt_DoCoreLinting))
, ( "dstg-lint", NoArg (setDynFlag Opt_DoStgLinting))
, ( "fmax-simplifier-iterations", IntSuffix (\n ->
upd (\dfs -> dfs{ maxSimplIterations = n })) )
- , ( "fliberate-case-threshold", IntSuffix (\n -> upd (\dfs -> dfs{ libCaseThreshold = n })))
+
+ -- liberate-case-threshold is an old flag for '-fspec-threshold'
+ , ( "fspec-threshold", IntSuffix (\n -> upd (\dfs -> dfs{ specThreshold = n })))
+ , ( "fliberate-case-threshold", IntSuffix (\n -> upd (\dfs -> dfs{ specThreshold = n })))
+
, ( "frule-check", SepArg (\s -> upd (\dfs -> dfs{ ruleCheck = Just s })))
, ( "fcontext-stack" , IntSuffix $ \n -> upd $ \dfs -> dfs{ ctxtStkDepth = n })
------ Compiler flags -----------------------------------------------
+ , ( "fasm", AnySuffix (\_ -> setObjTarget HscAsm) )
+ , ( "fvia-c", NoArg (setObjTarget HscC) )
+ , ( "fvia-C", NoArg (setObjTarget HscC) )
+
, ( "fno-code", NoArg (setTarget HscNothing))
- , ( "fasm", AnySuffix (\_ -> setTarget HscAsm) )
- , ( "fvia-c", NoArg (setTarget HscC) )
- , ( "fvia-C", NoArg (setTarget HscC) )
+ , ( "fbyte-code", NoArg (setTarget HscInterpreted) )
+ , ( "fobject-code", NoArg (setTarget defaultHscTarget) )
, ( "fglasgow-exts", NoArg (mapM_ setDynFlag glasgowExtsFlags) )
, ( "fno-glasgow-exts", NoArg (mapM_ unSetDynFlag glasgowExtsFlags) )
( "generics", Opt_Generics ),
( "strictness", Opt_Strictness ),
( "full-laziness", Opt_FullLaziness ),
+ ( "liberate-case", Opt_LiberateCase ),
+ ( "spec-constr", Opt_SpecConstr ),
( "cse", Opt_CSE ),
( "ignore-interface-pragmas", Opt_IgnoreInterfacePragmas ),
( "omit-interface-pragmas", Opt_OmitInterfacePragmas ),
where
pid = stringToPackageId p
--- we can only switch between HscC, and HscAsmm with dynamic flags
--- (-fvia-C, -fasm, -filx respectively).
-setTarget l = upd (\dfs -> case hscTarget dfs of
- HscC -> dfs{ hscTarget = l }
- HscAsm -> dfs{ hscTarget = l }
- _ -> dfs)
+-- If we're linking a binary, then only targets that produce object
+-- code are allowed (requests for other target types are ignored).
+setTarget l = upd set
+ where
+ set dfs
+ | ghcLink dfs /= LinkBinary || isObjectTarget l = dfs{ hscTarget = l }
+ | otherwise = dfs
+
+-- Changes the target only if we're compiling object code. This is
+-- used by -fasm and -fvia-C, which switch from one to the other, but
+-- not from bytecode to object-code. The idea is that -fasm/-fvia-C
+-- can be safely used in an OPTIONS_GHC pragma.
+setObjTarget l = upd set
+ where
+ set dfs
+ | isObjectTarget (hscTarget dfs) = dfs { hscTarget = l }
+ | otherwise = dfs
setOptLevel :: Int -> DynFlags -> DynFlags
setOptLevel n dflags