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improve isdefined precision for 0 field types #58220

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Merged
merged 10 commits into from
May 3, 2025
Merged

improve isdefined precision for 0 field types #58220

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1da6ec3
improve isdefined precision for 0 field types
oscardssmith Apr 24, 2025
4614f22
add test
oscardssmith Apr 24, 2025
5035be3
fix
oscardssmith Apr 24, 2025
e9ecdd5
fixes
oscardssmith Apr 24, 2025
9fdef60
Update Compiler/src/tfuncs.jl
oscardssmith Apr 24, 2025
363555e
Update Compiler/test/inference.jl
oscardssmith Apr 24, 2025
ae76e15
use `datatype_fieldcount` rather than `fieldcount`
oscardssmith Apr 25, 2025
9867f8a
Update tfuncs.jl
oscardssmith Apr 25, 2025
3f32639
fix `datatype_fieldcount(NamedTuple{<:Any, Tuple}.body)`
oscardssmith May 2, 2025
81f0133
fix test
oscardssmith May 2, 2025
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4 changes: 4 additions & 0 deletions Compiler/src/tfuncs.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -450,6 +450,10 @@ end
return Const(true)
end
end
# datatype_fieldcount is what `fieldcount` uses internally
# and returns nothing (!==0) for non-definite field counts.
elseif datatype_fieldcount(a1) === 0
return Const(false)
end
elseif isa(a1, Union)
# Results can only be `Const` or `Bool`
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1 change: 1 addition & 0 deletions Compiler/test/inference.jl
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Expand Up @@ -1210,6 +1210,7 @@ let isdefined_tfunc(@nospecialize xs...) =
@test isdefined_tfunc(Union{UnionIsdefinedA,UnionIsdefinedB}, Const(:x)) === Const(true)
@test isdefined_tfunc(Union{UnionIsdefinedA,UnionIsdefinedB}, Const(:y)) === Const(false)
@test isdefined_tfunc(Union{UnionIsdefinedA,Nothing}, Const(:x)) === Bool
@test isdefined_tfunc(Nothing, Any) === Const(false)
end

# https://github.com/aviatesk/JET.jl/issues/379
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2 changes: 1 addition & 1 deletion base/runtime_internals.jl
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Expand Up @@ -1116,7 +1116,7 @@ function datatype_fieldcount(t::DataType)
return length(names)
end
if types isa DataType && types <: Tuple
return fieldcount(types)
return datatype_fieldcount(types)
end
return nothing
elseif isabstracttype(t)
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