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add `wrap` function which is the safe counterpart to `unsafe_wrap`. #52049

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vtjnash merged 16 commits into JuliaLang:master from MasonProtter:wrap

Dec 9, 2023

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MasonProtter commented Nov 6, 2023 •

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This gives users a way to create new Arrays out of existing Memory since Array has no constructors still. ~~There's a @test_broken in there due to #52048~~


          add wrap function which is the safe counterpart to unsafe_wrap.

018cfdf

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LilithHafner commented Nov 6, 2023 •

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~~This LGTM~~ except for the length issue which is definitely blocking. We can't have arrays floating around with incorrect lengths.

I wish we could call this function Array, but the existing Array "constructors" are copying and this isn't.

EDIT: yipes, I didn't realize these internals still had so many gotchas. Thank you for the review, @vtjnash.

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a::Array{T, N>1} assumes that length(a) = length(a.ref.mem) #52048

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          update from review

e333739

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+                  mem = ref.mem
+                  mem_len = length(mem)
+                  len = Core.checked_dims(dims...)
+                  @boundscheck mem_len >= len || invalid_wrap_err(men_len, dims)

Contributor Author

MasonProtter Nov 6, 2023 •

edited

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should this check be behind a @boundscheck or should it just always be there?


          fix docs

75c177d

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MasonProtter added 2 commits

November 9, 2023 13:22


          fix typo

4cac28b


          Merge branch 'master' into wrap

2cdee6c

vtjnash mentioned this pull request

Avoid unalias() for matching Array{T} when broadcasting #52286

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MasonProtter and others added 3 commits

November 26, 2023 22:20


          Update base/array.jl

3833df9

Co-authored-by: Jameson Nash <[email protected]>


          Update base/array.jl

30d387a

Co-authored-by: Jameson Nash <[email protected]>


          Update array.jl

3e85253

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MasonProtter added 7 commits

November 26, 2023 22:25


          Update array.jl

0e70a6d


          test with an offset memref

60748b5


          Update arrayops.jl

3937b28


          fix memory size checks

aafc381


          test for MemoryRef offsets causing oob

8fe2ff1


          Merge branch 'master' into wrap

6d1cb68


          fix typo

94d1acd

Contributor Author

MasonProtter commented Nov 27, 2023

okay this should be ready now


          Include link to PR

3ddbcda

brenhinkeller added arrays feature merge me labels

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LilithHafner commented Dec 9, 2023

@vtjnash do you concur?

vtjnash merged commit 84cfe04 into JuliaLang:master

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vtjnash commented Dec 9, 2023

Should we consider adding support to view now too, that calls into this?

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MasonProtter commented Dec 9, 2023 •

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I'm not sure it'd really be that useful for view, since the call to jl_genericmemory_slice would induce an allocation 😞

That's why I wanted a way to wrap without re-allocating the memory slice as in #52048

Contributor Author

MasonProtter commented Dec 9, 2023

I guess actually we could do it for 1D views without allocations. But it's kinda unsatisfying to have it only be nice for 1D.

LilithHafner removed the merge me label

MasonProtter deleted the wrap branch

December 13, 2023 11:29

Liozou mentioned this pull request

Qualify wrap calls to avoid conflict on julia v1.11 carlobaldassi/ArgParse.jl#128

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fatteneder mentioned this pull request

Add Base.wrap to docs #53342

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fatteneder added a commit that referenced this pull request


          Add Base.wrap to docs (#53342)

2ca3753

I thought that's reasonable in the light that `view` was not
implemented:
#52049 (comment)

jariji mentioned this pull request

wrap is a very generic name to export #53552

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tecosaur pushed a commit to tecosaur/julia that referenced this pull request


          Add Base.wrap to docs (JuliaLang#53342)

62767be

I thought that's reasonable in the light that `view` was not
implemented:
JuliaLang#52049 (comment)

KristofferC pushed a commit that referenced this pull request


          Revert "add wrap function which is the safe counterpart to `unsafe_…

d3b8ebf

…wrap`. (#52049)"

This reverts commit 84cfe04.

KristofferC mentioned this pull request

view(::Memory, ::UnitRange) should not create a Vector #54768

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