src: give Http2Session JS fields their own backing store #31648
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It looks like it’s virtually impossible at this point to create “fake” backing stores for objects that don’t fully own their memory allocations, like the sub-field `js_fields_` of `Http2Session`. In particular, it turns out that an `ArrayBuffer` cannot always be easily separated from its backing store in that situation through by detaching it. This commit gives the JS-exposed parts of the class its own memory allocation and its own backing store, simplifying the code a bit and fixing flakiness coming from it, at the cost of one additional layer of indirection when accessing the data. Refs: nodejs#30782 Fixes: nodejs#31107
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It looks like it’s virtually impossible at this point to create “fake” backing stores for objects that don’t fully own their memory allocations, like the sub-field `js_fields_` of `Http2Session`. In particular, it turns out that an `ArrayBuffer` cannot always be easily separated from its backing store in that situation through by detaching it. This commit gives the JS-exposed parts of the class its own memory allocation and its own backing store, simplifying the code a bit and fixing flakiness coming from it, at the cost of one additional layer of indirection when accessing the data. Refs: #30782 Fixes: #31107 PR-URL: #31648 Reviewed-By: James M Snell <jasnell@gmail.com> Reviewed-By: Denys Otrishko <shishugi@gmail.com>
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@addaleax this doesn't appear to land cleanly on 13.x, would you be open to backport? |
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I don’t think this needs to be backported, it fixes a bug introduced in a semver-major PR (#30782). |
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It looks like it’s virtually impossible at this point to
create “fake” backing stores for objects that don’t fully
own their memory allocations, like the sub-field
js_fields_of
Http2Session. In particular, it turns out that anArrayBuffercannot always be easily separated from itsbacking store in that situation through by detaching it.
This commit gives the JS-exposed parts of the class its own
memory allocation and its own backing store, simplifying the
code a bit and fixing flakiness coming from it, at the cost
of one additional layer of indirection when accessing the data.
Refs: #30782
Fixes: #31107
Checklist
make -j4 test(UNIX), orvcbuild test(Windows) passes