[gecko] Support AutoTArrays created from rust. #70
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This is a patch to add basic support to rust-created AutoTArrays. The existing AutoTArray handling was slightly broken, as thin-vec had a subtly different interpretation of the mIsAutoArray member than Gecko. You can read the details in the commit messages of https://bugzilla.mozilla.org/show_bug.cgi?id=1983704, but the TLDR is that I made Gecko match the thin-vec interpretation. No behavior change outside of the gecko-ffi mode. I'm adding some extra tests in that bug. Reviewed upstream by Nika. See also: https://bugzil.la/1978229 Differential Revision: https://phabricator.services.mozilla.com/D257930
nicoburns
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Aug 19, 2025
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I am unable to give this a meaningful review, but I am happy to rubber stamp it on the basis that it has been reviewed within Mozilla (review is linked).
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This is a patch to add basic support to rust-created AutoTArrays. The existing AutoTArray handling was slightly broken, as thin-vec had a subtly different interpretation of the mIsAutoArray member than Gecko.
You can read the details in the commit messages of https://bugzilla.mozilla.org/show_bug.cgi?id=1983704, but the TLDR is that I made Gecko match the thin-vec interpretation.
No behavior change outside of the gecko-ffi mode. I'm adding some extra tests in that bug.
Reviewed upstream by Nika.
See also: https://bugzil.la/1978229
Differential Revision: https://phabricator.services.mozilla.com/D257930