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| author | Sylvain Henry <sylvain@haskus.fr> | 2021-11-25 13:59:08 +0100 |
|---|---|---|
| committer | Marge Bot <ben+marge-bot@smart-cactus.org> | 2021-11-29 11:04:03 -0500 |
| commit | 14e9cab675f5b0abf2c303a0aa455237768103d1 (patch) | |
| tree | ef6f0804d2fe0cd3f7ff6df19d99dda7a0cb1615 /compiler/GHC/Driver/Env.hs | |
| parent | 7ea665bfed7c9915038d8ea6cb820479970a10fa (diff) | |
| download | haskell-14e9cab675f5b0abf2c303a0aa455237768103d1.tar.gz | |
Use Monoid in hptSomeThingsBelowUs
It seems to have a moderate but good impact on perf tests in CI.
In particular:
MultiLayerModules(normal) ghc/alloc 3125771138.7 3065532240.0 -1.9%
So it's likely that huge projects will benefit from this.
Diffstat (limited to 'compiler/GHC/Driver/Env.hs')
| -rw-r--r-- | compiler/GHC/Driver/Env.hs | 33 |
1 files changed, 15 insertions, 18 deletions
diff --git a/compiler/GHC/Driver/Env.hs b/compiler/GHC/Driver/Env.hs index b58b227fad..02d9249bd1 100644 --- a/compiler/GHC/Driver/Env.hs +++ b/compiler/GHC/Driver/Env.hs @@ -211,17 +211,15 @@ hptAllInstances hsc_env -- | Find instances visible from the given set of imports hptInstancesBelow :: HscEnv -> ModuleName -> Set ModuleNameWithIsBoot -> ([ClsInst], [FamInst]) hptInstancesBelow hsc_env mn mns = - let (insts, famInsts) = - unzip $ hptSomeThingsBelowUs (\mod_info -> - let details = hm_details mod_info - -- Don't include instances for the current module - in if moduleName (mi_module (hm_iface mod_info)) == mn - then [] - else [(md_insts details, md_fam_insts details)]) - True -- Include -hi-boot - hsc_env - mns - in (concat insts, concat famInsts) + hptSomeThingsBelowUs (\mod_info -> + let details = hm_details mod_info + -- Don't include instances for the current module + in if moduleName (mi_module (hm_iface mod_info)) == mn + then mempty + else (md_insts details, md_fam_insts details)) + True -- Include -hi-boot + hsc_env + mns -- | Get rules from modules "below" this one (in the dependency sense) hptRules :: HscEnv -> Set ModuleNameWithIsBoot -> [CoreRule] @@ -267,13 +265,13 @@ hptModulesBelow hsc_env mn = filtered_mods $ [ mnwib | NodeKey_Module mnwib <- -- | Get things from modules "below" this one (in the dependency sense) -- C.f Inst.hptInstances -hptSomeThingsBelowUs :: (HomeModInfo -> [a]) -> Bool -> HscEnv -> Set ModuleNameWithIsBoot -> [a] +hptSomeThingsBelowUs :: Monoid a => (HomeModInfo -> a) -> Bool -> HscEnv -> Set ModuleNameWithIsBoot -> a hptSomeThingsBelowUs extract include_hi_boot hsc_env deps - | isOneShot (ghcMode (hsc_dflags hsc_env)) = [] + | isOneShot (ghcMode (hsc_dflags hsc_env)) = mempty | otherwise = let hpt = hsc_HPT hsc_env - in + in mconcat [ thing | -- Find each non-hi-boot module below me GWIB { gwib_mod = mod, gwib_isBoot = is_boot } <- Set.toList (hptModulesBelow hsc_env deps) @@ -286,15 +284,14 @@ hptSomeThingsBelowUs extract include_hi_boot hsc_env deps , mod /= moduleName gHC_PRIM -- Look it up in the HPT - , let things = case lookupHpt hpt mod of + , let thing = case lookupHpt hpt mod of Just info -> extract info - Nothing -> pprTrace "WARNING in hptSomeThingsBelowUs" msg [] + Nothing -> pprTrace "WARNING in hptSomeThingsBelowUs" msg mempty msg = vcat [text "missing module" <+> ppr mod, text "Probable cause: out-of-date interface files"] -- This really shouldn't happen, but see #962 + ] - -- And get its dfuns - , thing <- things ] -- | Deal with gathering annotations in from all possible places |