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check for typemin(T) in denominator of rational #32572

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merged 9 commits into from
Dec 17, 2019
Merged

check for typemin(T) in denominator of rational #32572

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c6df5aa
check for `typemin(T)` in denominator of rational
simeonschaub Jul 13, 2019
1b275d7
add test for #32569
simeonschaub Jul 13, 2019
f3dcb6e
check if `typemin` is defined before calling it
simeonschaub Jul 13, 2019
b441119
use `isbitstype` instead of `hasmethod`
simeonschaub Jul 24, 2019
6b299e6
add `hastypemin`, use in Rational constructor
simeonschaub Jul 27, 2019
e0ce76c
`signbit(den) && signbit(-den)` instead of typemin
simeonschaub Nov 25, 2019
418da48
implement suggestions from @KlausC
simeonschaub Nov 29, 2019
afe59bf
remove unnecessary issue number
simeonschaub Nov 30, 2019
52f1bd8
divgcd before typemin check
simeonschaub Dec 12, 2019
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14 changes: 10 additions & 4 deletions base/rational.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -11,12 +11,18 @@ struct Rational{T<:Integer} <: Real
den::T

function Rational{T}(num::Integer, den::Integer) where T<:Integer
num == den == zero(T) && __throw_rational_argerror(T)
num2, den2 = signbit(den) ? divgcd(-num, -den) : divgcd(num, den)
new(num2, den2)
num == den == zero(T) && __throw_rational_argerror_zero(T)
num2, den2 = divgcd(num, den)
if T<:Signed && signbit(den2)
den2 = -den2
signbit(den2) && __throw_rational_argerror_typemin(T)
num2 = -num2
end
return new(num2, den2)
end
end
@noinline __throw_rational_argerror(T) = throw(ArgumentError("invalid rational: zero($T)//zero($T)"))
@noinline __throw_rational_argerror_zero(T) = throw(ArgumentError("invalid rational: zero($T)//zero($T)"))
@noinline __throw_rational_argerror_typemin(T) = throw(ArgumentError("invalid rational: denominator can't be typemin($T)"))

Rational(n::T, d::T) where {T<:Integer} = Rational{T}(n,d)
Rational(n::Integer, d::Integer) = Rational(promote(n,d)...)
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4 changes: 4 additions & 0 deletions test/rational.jl
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Expand Up @@ -32,6 +32,10 @@ using Test
@test_throws ArgumentError rationalize(Int, big(3.0), -1.)
# issue 26823
@test_throws InexactError rationalize(Int, NaN)
# issue 32569
@test_throws ArgumentError 1 // typemin(Int)
@test -2 // typemin(Int) == -1 // (typemin(Int) >> 1)
@test 2 // typemin(Int) == 1 // (typemin(Int) >> 1)

for a = -5:5, b = -5:5
if a == b == 0; continue; end
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