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inference: improve isdefined_tfunc accuracy for MustAlias #58743

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Merged
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Jun 17, 2025
+16 −6
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inference: improve isdefined_tfunc accuracy for MustAlias #58743

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3 changes: 3 additions & 0 deletions Compiler/src/tfuncs.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -405,6 +405,9 @@ end
return isdefined_tfunc(𝕃, arg1, sym)
end
@nospecs function isdefined_tfunc(𝕃::AbstractLattice, arg1, sym)
if arg1 isa MustAlias
arg1 = widenmustalias(arg1)
end
arg1t = arg1 isa Const ? typeof(arg1.val) : isconstType(arg1) ? typeof(arg1.parameters[1]) : widenconst(arg1)
a1 = unwrap_unionall(arg1t)
if isa(a1, DataType) && !isabstracttype(a1)
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19 changes: 13 additions & 6 deletions Compiler/test/inference.jl
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Expand Up @@ -2313,12 +2313,6 @@ let 𝕃ᵢ = InferenceLattice(MustAliasesLattice(BaseInferenceLattice.instance)
@test ifelse_tfunc(MustAlias(2, AliasableField{Any}, 1, Int), Int, Int) === Union{}
end

@testset "issue #56913: `BoundsError` in type inference" begin
R = UnitRange{Int}
@test Type{AbstractVector} == Base.infer_return_type(Base.promote_typeof, Tuple{R, R, Vector{Any}, Vararg{R}})
@test Type{AbstractVector} == Base.infer_return_type(Base.promote_typeof, Tuple{R, R, Vector{Any}, R, Vararg{R}})
end

maybeget_mustalias_tmerge(x::AliasableField) = x.f
maybeget_mustalias_tmerge(x) = x
@test Base.return_types((Union{Nothing,AliasableField{Any}},); interp=MustAliasInterpreter()) do x
Expand Down Expand Up @@ -2593,6 +2587,19 @@ end |> only === Compiler.InterMustAlias
return 0
end == Integer

# `isdefined` accuracy for `MustAlias`
@test Base.infer_return_type((Any,); interp=MustAliasInterpreter()) do x
xx = Ref{Any}(x)
xxx = Some{Any}(xx)
Val(isdefined(xxx.value, :x))
end == Val{true}

@testset "issue #56913: `BoundsError` in type inference" begin
R = UnitRange{Int}
@test Type{AbstractVector} == Base.infer_return_type(Base.promote_typeof, Tuple{R, R, Vector{Any}, Vararg{R}})
@test Type{AbstractVector} == Base.infer_return_type(Base.promote_typeof, Tuple{R, R, Vector{Any}, R, Vararg{R}})
end

function f25579(g)
h = g[]
t = (h === nothing)
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