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fixes to colonful reshape #54261

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May 13, 2024
Merged

fixes to colonful reshape #54261

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77a2463
fixes to colonful `reshape`
nsajko Apr 25, 2024
0dd2390
also add some type assertions for good measure
nsajko Apr 26, 2024
f1fc62f
fix issue pointed out by N5N3
nsajko Apr 29, 2024
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20 changes: 16 additions & 4 deletions base/reshapedarray.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -132,12 +132,24 @@ reshape(parent::AbstractArray, dims::Tuple{Vararg{Union{Int,Colon}}}) = reshape(
"may have at most one omitted dimension specified by `Colon()`")))
@noinline throw2(A, dims) = throw(DimensionMismatch(string("array size $(length(A)) ",
"must be divisible by the product of the new dimensions $dims")))
pre = _before_colon(dims...)
pre = _before_colon(dims...)::Tuple{Vararg{Int}}
post = _after_colon(dims...)
_any_colon(post...) && throw1(dims)
sz, remainder = divrem(length(A), prod(pre)*prod(post))
remainder == 0 || throw2(A, dims)
(pre..., Int(sz), post...)
post::Tuple{Vararg{Int}}
len = length(A)
sz, is_exact = if iszero(len)
(0, true)
else
let pr = Core.checked_dims(pre..., post...) # safe product
if iszero(pr)
throw2(A, dims)
end
(quo, rem) = divrem(len, pr)
(Int(quo), iszero(rem))
end
end::Tuple{Int,Bool}
is_exact || throw2(A, dims)
(pre..., sz, post...)::Tuple{Int,Vararg{Int}}
end
@inline _any_colon() = false
@inline _any_colon(dim::Colon, tail...) = true
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18 changes: 18 additions & 0 deletions test/abstractarray.jl
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Expand Up @@ -1852,6 +1852,24 @@ function check_pointer_strides(A::AbstractArray)
return true
end

@testset "colonful `reshape`, #54245" begin
@test reshape([], (0, :)) isa Matrix
@test_throws DimensionMismatch reshape([7], (0, :))
let b = prevpow(2, typemax(Int))
@test iszero(b*b)
@test_throws ArgumentError reshape([7], (b, :, b))
@test reshape([], (b, :, b)) isa Array{<:Any, 3}
end
for iterator ∈ (7:6, 7:7, 7:8)
for it ∈ (iterator, map(BigInt, iterator))
@test reshape(it, (:, Int(length(it)))) isa AbstractMatrix
@test reshape(it, (Int(length(it)), :)) isa AbstractMatrix
@test reshape(it, (1, :)) isa AbstractMatrix
@test reshape(it, (:, 1)) isa AbstractMatrix
end
end
end

@testset "strides for ReshapedArray" begin
# Type-based contiguous Check
a = vec(reinterpret(reshape, Int16, reshape(view(reinterpret(Int32, randn(10)), 2:11), 5, :)))
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