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inference: make limit::Int as a caching key of CachedMethodTable #46799

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Sep 17, 2022
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inference: make limit::Int as a caching key of CachedMethodTable #46799

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18 changes: 13 additions & 5 deletions base/compiler/methodtable.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -44,17 +44,23 @@ struct OverlayMethodTable <: MethodTableView
mt::Core.MethodTable
end

struct MethodMatchKey
sig # ::Type
limit::Int
MethodMatchKey(@nospecialize(sig), limit::Int) = new(sig, limit)
end

"""
struct CachedMethodTable <: MethodTableView

Overlays another method table view with an additional local fast path cache that
can respond to repeated, identical queries faster than the original method table.
"""
struct CachedMethodTable{T} <: MethodTableView
cache::IdDict{Any, Union{Missing, MethodMatchResult}}
cache::IdDict{MethodMatchKey, Union{Missing,MethodMatchResult}}
table::T
end
CachedMethodTable(table::T) where T = CachedMethodTable{T}(IdDict{Any, Union{Missing, MethodMatchResult}}(), table)
CachedMethodTable(table::T) where T = CachedMethodTable{T}(IdDict{MethodMatchKey, Union{Missing,MethodMatchResult}}(), table)

"""
findall(sig::Type, view::MethodTableView; limit::Int=typemax(Int)) ->
Expand Down Expand Up @@ -109,9 +115,11 @@ function findall(@nospecialize(sig::Type), table::CachedMethodTable; limit::Int=
# as for concrete types, we cache result at on the next level
return findall(sig, table.table; limit)
end
box = Core.Box(sig)
return get!(table.cache, sig) do
findall(box.contents, table.table; limit)
key = MethodMatchKey(sig, limit)
if haskey(table.cache, key)
return table.cache[key]
else
return table.cache[key] = findall(sig, table.table; limit)
end
end

Expand Down