src: use v8::(Des|S)erializeInternalFieldsCallback #53217
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Previously V8 would just try to serialize the context data fields "verbatim" by copying the pointer values. This patch makes use of the new callbacks so that at serialization, the embedder data for the context can at least be serialized in a meaningful way (which are all reset to empty for now). Otherwise the upstream may have difficulties serializing these pointer values "verbatim" especially with the introduction of external pointer tables, even though the verbatim pointer values from a previous process is meaningless to Node.js. For Node.js the callback currently just checks that the slots are know. We will reassign the pointers with newly created native structures during deserialization and there isn't much we can reuse for now.
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Commit Queue failed- Loading data for nodejs/node/pull/53217 ✔ Done loading data for nodejs/node/pull/53217 ----------------------------------- PR info ------------------------------------ Title src: use v8::(Des|S)erializeInternalFieldsCallback (#53217) Author Joyee Cheung (@joyeecheung) Branch joyeecheung:context-data -> nodejs:main Labels c++, author ready, needs-ci, snapshot Commits 1 - src: use v8::(Des|S)erializeInternalFieldsCallback Committers 1 - Joyee Cheung PR-URL: https://github.com/nodejs/node/pull/53217 Refs: https://chromium-review.googlesource.com/c/v8/v8/+/5512712/comments/cfc2b28d_c921ac80?tab=comments Reviewed-By: Chengzhong Wu ------------------------------ Generated metadata ------------------------------ PR-URL: https://github.com/nodejs/node/pull/53217 Refs: https://chromium-review.googlesource.com/c/v8/v8/+/5512712/comments/cfc2b28d_c921ac80?tab=comments Reviewed-By: Chengzhong Wu -------------------------------------------------------------------------------- ℹ This PR was created on Thu, 30 May 2024 13:11:13 GMT ✔ Approvals: 1 ✔ - Chengzhong Wu (@legendecas) (TSC): https://github.com/nodejs/node/pull/53217#pullrequestreview-2090507412 ✘ This PR needs to wait 2 more hours to land (or 0 hours if there is one more approval) ✔ Last GitHub CI successful ℹ Last Full PR CI on 2024-05-30T16:38:45Z: https://ci.nodejs.org/job/node-test-pull-request/59545/ - Querying data for job/node-test-pull-request/59545/ ✔ Last Jenkins CI successful -------------------------------------------------------------------------------- ✔ Aborted `git node land` session in /home/runner/work/node/node/.ncuhttps://github.com/nodejs/node/actions/runs/9399477851 |
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Previously V8 would just try to serialize the context data fields "verbatim" by copying the pointer values. This patch makes use of the new callbacks so that at serialization, the embedder data for the context can at least be serialized in a meaningful way (which are all reset to empty for now). Otherwise the upstream may have difficulties serializing these pointer values "verbatim" especially with the introduction of external pointer tables, even though the verbatim pointer values from a previous process is meaningless to Node.js. For Node.js the callback currently just checks that the slots are know. We will reassign the pointers with newly created native structures during deserialization and there isn't much we can reuse for now. PR-URL: #53217 Refs: https://chromium-review.googlesource.com/c/v8/v8/+/5512712/comments/cfc2b28d_c921ac80?tab=comments Reviewed-By: Chengzhong Wu <[email protected]>
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Previously V8 would just try to serialize the context data fields "verbatim" by copying the pointer values. This patch makes use of the new callbacks so that at serialization, the embedder data for the context can at least be serialized in a meaningful way (which are all reset to empty for now). Otherwise the upstream may have difficulties serializing these pointer values "verbatim" especially with the introduction of external pointer tables, even though the verbatim pointer values from a previous process is meaningless to Node.js. For Node.js the callback currently just checks that the slots are know. We will reassign the pointers with newly created native structures during deserialization and there isn't much we can reuse for now. PR-URL: nodejs#53217 Refs: https://chromium-review.googlesource.com/c/v8/v8/+/5512712/comments/cfc2b28d_c921ac80?tab=comments Reviewed-By: Chengzhong Wu <[email protected]>
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Previously V8 would just try to serialize the context data fields "verbatim" by copying the pointer values. This patch makes use of the new callbacks so that at serialization, the embedder data for the context can at least be serialized in a meaningful way (which are all reset to empty for now). Otherwise the upstream may have difficulties serializing these pointer values "verbatim" especially with the introduction of external pointer tables, even though the verbatim pointer values from a previous process is meaningless to Node.js. For Node.js the callback currently just checks that the slots are know. We will reassign the pointers with newly created native structures during deserialization and there isn't much we can reuse for now. PR-URL: nodejs#53217 Refs: https://chromium-review.googlesource.com/c/v8/v8/+/5512712/comments/cfc2b28d_c921ac80?tab=comments Reviewed-By: Chengzhong Wu <[email protected]>
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Split from #50983, that one needs more work to make the entire snapshot reproducible. This at least makes the context data slots serialized as some non-gibberish (empty) values, otherwise V8 might run into issues serializing the gibberish pointer values.
Previously V8 would just try to serialize the context data fields "verbatim" by copying the pointer values. This patch makes use of the new callbacks so that at serialization, the embedder data for the context can at least be serialized in a meaningful way (which are all reset to empty for now). Otherwise the upstream may have difficulties serializing these pointer values "verbatim" especially with the introduction of external pointer tables, even though the verbatim pointer values from a previous process is meaningless to Node.js.
For Node.js the callback currently just checks that the slots are known. We will reassign the pointers with newly created native structures during deserialization and there isn't much we can reuse for now.
Refs: https://chromium-review.googlesource.com/c/v8/v8/+/5512712/comments/cfc2b28d_c921ac80?tab=comments