diff options
| -rw-r--r-- | compiler/GHC/Iface/Tidy.hs | 22 |
1 files changed, 21 insertions, 1 deletions
diff --git a/compiler/GHC/Iface/Tidy.hs b/compiler/GHC/Iface/Tidy.hs index 135a0b9ad4..9101fdcecd 100644 --- a/compiler/GHC/Iface/Tidy.hs +++ b/compiler/GHC/Iface/Tidy.hs @@ -30,7 +30,7 @@ import GHC.Core.Tidy import GHC.Core.Seq ( seqBinds ) import GHC.Core.Opt.Arity ( exprArity, typeArity, exprBotStrictness_maybe ) import GHC.Core.InstEnv -import GHC.Core.Type ( Type, tidyTopType ) +import GHC.Core.Type import GHC.Core.DataCon import GHC.Core.TyCon import GHC.Core.Class @@ -73,6 +73,8 @@ import Data.Function import Data.List ( sortBy, mapAccumL ) import qualified Data.Set as S import GHC.Types.CostCentre +import GHC.Core.Predicate +import GHC.Core.Multiplicity {- Constructing the TypeEnv, Instances, Rules from which the @@ -775,6 +777,8 @@ addExternal opts id -- source is an inline rule || not dont_inline + + || isOverloaded id where dont_inline | never_active = True -- Will never inline @@ -791,6 +795,22 @@ addExternal opts id show_unfolding (DFunUnfolding {}) = True show_unfolding _ = False +isOverloaded :: Id -> Bool +isOverloaded fn = + let fun_type = idType fn + -- getRuntimeArgTys can return an infinite list in edge cases. + -- If a function has >256 type args and the first 256 don't + -- contain a type class we don't expose the unfolding. + -- It's an arbitrary limit but seems acceptable to me. + (rt_tys,_rt_ty_flag) = unzip $ take 256 $ getRuntimeArgTys fun_type + has_dict_arg = any (isClassPred. scaledThing) rt_tys + in + -- pprTrace "isOverloaded" (hang (text "overloaded:" <> ppr has_dict_arg) 4 $ + -- text "ty:" <> ppr fun_type $$ + -- text "getRuntimeArgTys:" <> ppr (getRuntimeArgTys fun_type) + -- ) + + has_dict_arg {- ************************************************************************ * * |