src: migrate from deprecated SnapshotCreator constructor #55337

joyeecheung · 2024-10-09T16:50:00Z

Previously we have been using the variant of SnapshotCreator that only passes the external references instead of
v8::Isolate::CreateParams and it's about to be deprecated. Switch to using the new constructor that takes a fully CreateParams instead.

This also makes sure that the snapshot building script is using the Node.js array buffer allocator instead of a separate default one that was previously used by the old constructor. The zero fill toggle in the Node.js array buffer allocator would still be ignored during snapshot building, however, until we fixes the array buffer allocator and let V8 own the toggle backing store instead, because otherwise the snapshot would contain the external toggle address and become unreproducible.

nodejs-github-bot · 2024-10-09T16:50:05Z

Review requested:

@nodejs/startup

codecov · 2024-10-09T18:12:44Z

Codecov Report

Attention: Patch coverage is 87.50000% with 5 lines in your changes missing coverage. Please review.

Project coverage is 90.24%. Comparing base (29af9ce) to head (b007f46).
Report is 6 commits behind head on main.

Files with missing lines	Patch %	Lines
lib/internal/buffer.js	72.22%	5 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #55337   +/-   ##
=======================================
  Coverage   90.24%   90.24%           
=======================================
  Files         630      630           
  Lines      185670   185688   +18     
  Branches    36405    36407    +2     
=======================================
+ Hits       167555   167574   +19     
  Misses      10998    10998           
+ Partials     7117     7116    -1

Files with missing lines	Coverage Δ
lib/internal/process/pre_execution.js	`95.96% <ø> (+0.40%)`	⬆️
src/api/embed_helpers.cc	`75.98% <100.00%> (+1.36%)`	⬆️
src/node_buffer.cc	`67.20% <100.00%> (-0.31%)`	⬇️
src/node_snapshotable.cc	`75.52% <100.00%> (+0.13%)`	⬆️
lib/internal/buffer.js	`98.49% <72.22%> (-0.26%)`	⬇️

... and 26 files with indirect coverage changes

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legendecas · 2024-10-10T07:05:28Z

I assume the labels were removed because of the awkward GitHub UI.

lib/internal/buffer.js

joyeecheung · 2024-10-25T13:35:08Z

It seems the checksum of the read only snapshots are mismatched after the changes. Need to look into a bit..

github-actions · 2025-04-12T23:27:48Z

Failed to start CI

   ⚠  Commits were pushed since the last approving review:
   ⚠  - src: migrate from deprecated SnapshotCreator constructor
   ⚠  - fixup! src: migrate from deprecated SnapshotCreator constructor
   ✘  Refusing to run CI on potentially unsafe PR

https://github.com/nodejs/node/actions/runs/14424311872

Previously we have been using the variant of SnapshotCreator that only passes the external references instead of v8::Isolate::CreateParams and it's about to be deprecated. Switch to using the new constructor that takes a fully CreateParams instead. This also makes sure that the snapshot building script is using the Node.js array buffer allocator instead of a separate default one that was previously used by the old constructor. The zero fill toggle in the Node.js array buffer allocator would still be ignored during snapshot building, however, until we fixes the array buffer allocator and let V8 own the toggle backing store instead, because otherwise the snapshot would contain the external toggle address and become unreproducible.

nodejs-github-bot · 2025-04-14T16:52:12Z

CI: https://ci.nodejs.org/job/node-test-pull-request/66265/ 💛

Previously we have been using the variant of SnapshotCreator that only passes the external references instead of v8::Isolate::CreateParams and it's about to be deprecated. Switch to using the new constructor that takes a fully CreateParams instead. This also makes sure that the snapshot building script is using the Node.js array buffer allocator instead of a separate default one that was previously used by the old constructor. The zero fill toggle in the Node.js array buffer allocator would still be ignored during snapshot building, however, until we fixes the array buffer allocator and let V8 own the toggle backing store instead, because otherwise the snapshot would contain the external toggle address and become unreproducible. PR-URL: #55337 Reviewed-By: Chengzhong Wu <[email protected]> Reviewed-By: Vladimir Morozov <[email protected]> Reviewed-By: Anna Henningsen <[email protected]> Reviewed-By: James M Snell <[email protected]>

jasnell · 2025-04-14T19:12:22Z

Landed in b2405e9

Previously we have been using the variant of SnapshotCreator that only passes the external references instead of v8::Isolate::CreateParams and it's about to be deprecated. Switch to using the new constructor that takes a fully CreateParams instead. This also makes sure that the snapshot building script is using the Node.js array buffer allocator instead of a separate default one that was previously used by the old constructor. The zero fill toggle in the Node.js array buffer allocator would still be ignored during snapshot building, however, until we fixes the array buffer allocator and let V8 own the toggle backing store instead, because otherwise the snapshot would contain the external toggle address and become unreproducible. PR-URL: #55337 Reviewed-By: Chengzhong Wu <[email protected]> Reviewed-By: Vladimir Morozov <[email protected]> Reviewed-By: Anna Henningsen <[email protected]> Reviewed-By: James M Snell <[email protected]>

lib/internal/buffer.js

ChALkeR · 2025-10-27T04:12:06Z

I checked the following:

4968db1 zero-fills allocUnsafe, 4968db1^ doesn't
494669b zero-fills allocUnsafe, 494669b^ doesn't
1e4871c zero-fills allocUnsafe, 1e4871c^ too, 1e4871c^^ doesn't

b2405e9 zero-fills allocUnsafe, b2405e9^ doesn't

b2405e9 was landed

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richardlau mentioned this pull request Oct 18, 2024

V8 13.0 Deprecations #55452

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joyeecheung added the blocked PRs that are blocked by other issues or PRs. label Oct 25, 2024

joyeecheung mentioned this pull request Apr 10, 2025

[help wanted] deps: update V8 to 13.6 #57753

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joyeecheung force-pushed the snapshot-params branch from 4968db1 to 494669b Compare April 12, 2025 18:17

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joyeecheung added 2 commits April 14, 2025 13:34

fixup! src: migrate from deprecated SnapshotCreator constructor

b007f46

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joyeecheung added dont-land-on-v18.x dont-land-on-v20.x PRs that should not land on the v20.x-staging branch and should not be released in v20.x. dont-land-on-v22.x PRs that should not land on the v22.x-staging branch and should not be released in v22.x. labels Apr 14, 2025

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2025-05-06, Version 24.0.0 (Current) #57609

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ChALkeR mentioned this pull request Oct 27, 2025

allocUnsafe is useless since 24 #60423

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