Base: bootstrap: eliminate Array-specific length methods#57627
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adienes merged 1 commit intoJuliaLang:masterfrom Aug 29, 2025
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Absolutely, this causes tons of invalidations, which is why I marked the PR as draft. Perhaps it'd make sense to set |
nsajko
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Aug 27, 2025
The method return type is known concretely as `OneTo{Int}`, however the
compiler can't tell because there are too many methods matching
`length(::Array)`, over the world-splitting threshold, `max_methods`.
Cross-reference PR JuliaLang#57627, which might help here in another way by
decreasing the number of unnecessary methods, however merging that PR
would also cause regressions if world-splitting is not disabled first
for `length` (xref PR JuliaLang#59377).
Fix that by asserting the return type of the `length` call as `Int`.
The `typeassert` should improve abstract return type inference, and
consequently make the sysimage more resistant to invalidation.
nsajko
added a commit
to nsajko/julia
that referenced
this pull request
Aug 27, 2025
The method return type is known concretely as `OneTo{Int}`, however the
compiler can't tell because there are too many methods matching
`length(::Array)`, over the world-splitting threshold, `max_methods`.
Cross-reference WIP PR JuliaLang#57627, which might help here in another way by
decreasing the number of unnecessary methods, however merging that PR
would also cause regressions if world-splitting is not disabled first
for `length` (xref WIP PR JuliaLang#59377).
Fix that by asserting the return type of the `length` call as `Int`.
The `typeassert` should improve abstract return type inference, and
consequently make the sysimage more resistant to invalidation.
nsajko
added a commit
to nsajko/julia
that referenced
this pull request
Aug 27, 2025
Three methods of `length` are deleted. Made possible by moving the following methods to earlier within the bootstrapping: * `size(a::Array)` * `length(t::AbstractArray)` Improves abstract return type inference of `f(x::Array) = length(a)`, presumably because the method count is now low enough for the world-splitting optimization to kick in. (cherry picked from commit c4e59a6) (cherry picked from PR JuliaLang#57627) Closes PR JuliaLang#57627
This was referenced Aug 27, 2025
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Just tried checking again how this PR affects the resistance of the sysimage to invalidation:
In particular, this entire tree of invalidations is prevented by this PR: Details
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"method_instance": "MethodInstance for collect(::Base.Generator{Vector{Symbol}, Base.Compiler.IRShow.var\"#validate_debuginfo_mode##0#validate_debuginfo_mode##1\"})"
},
"children": [
]
}
]
}
]
}
]
}
]
}
]
}
]
}
]
}
]
}
]
}
]
}
]
}
]
},
{
"method_instance": {
"method": "show_block(io::IO, head, args::Vector, body, indent::Int64, quote_level::Int64) @ Base show.jl:1625",
"method_instance": "MethodInstance for Base.show_block(::IOContext{IOBuffer}, ::Symbol, ::Vector, ::Expr, ::Int64, ::Int64)"
},
"children": [
{
"method_instance": {
"method": "show_unquoted(io::IO, ex::Expr, indent::Int64, prec::Int64, quote_level::Int64) @ Base show.jl:1898",
"method_instance": "MethodInstance for Base.show_unquoted(::IOBuffer, ::Expr, ::Int64, ::Int64, ::Int64)"
},
"children": [
]
}
]
}
]
}
]
}
]
},
{
"method_instance": {
"method": "show_list(io::IO, items, sep, indent::Int64, prec::Int64, quote_level::Int64, enclose_operators::Bool, kw::Bool) @ Base show.jl:1654",
"method_instance": "MethodInstance for Base.show_list(::IOContext{IOBuffer}, ::Array, ::String, ::Int64, ::Int64, ::Int64, ::Bool, ::Bool)"
},
"children": [
]
}
]
}
]
}The above invalidations happen on struct I <: Integer end
function Base.one(::I) end |
Three methods of `length` are deleted. Made possible by moving the following methods to earlier within the bootstrapping: * `size(a::Array)` * `length(t::AbstractArray)` Improves abstract return type inference of `f(x::Array) = length(a)` because the method count is now low enough for the world-splitting optimization to kick in.
nsajko
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nsajko
added
invalidations
and removed
needs tests
JeffBezanson
approved these changes
Aug 28, 2025
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merge? |
Member
|
this is a very nice simplification. we probably could continue the rework a bit more to get some further simplification. |
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PR: |
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Three methods of
lengthare deleted.Made possible by moving the following methods to earlier within the bootstrapping:
size(a::Array)length(t::AbstractArray)Improves abstract return type inference of
f(x::Array) = length(a), presumably because the method count is now low enough for the world-splitting optimization to kick in.