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refactor(turbo-tasks): Implement NonLocalValue for *all* ResolvedVcs and OperationVcs #73764

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merged 2 commits into from
Dec 11, 2024

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@bgw bgw commented Dec 10, 2024

This is a follow-up to #73714

What is NonLocalValue? https://turbopack-rust-docs.vercel.sh/rustdoc/turbo_tasks/trait.NonLocalValue.html

The core change here is this bit in turbopack/crates/turbo-tasks/src/vc/local.rs:

- unsafe impl<T: ?Sized + NonLocalValue> NonLocalValue for OperationVc<T> {}
- unsafe impl<T: ?Sized + NonLocalValue> NonLocalValue for ResolvedVc<T> {}
+ unsafe impl<T: ?Sized> NonLocalValue for OperationVc<T> {}
+ unsafe impl<T: ?Sized> NonLocalValue for ResolvedVc<T> {}

These new implementations are intentionally incorrect, as these values T could contain references to local Vc values. We must also check that T: NonLocalValue. However, we're temporarily ignoring that problem, as:

  • We don't currently depend on NonLocalValue for safety (local tasks aren't enabled).
  • We intend to make all VcValueTypes implement NonLocalValue, so implementing this for all values is approximating that future state.
  • Adding a T: NonLocalValue bound introduces a lot of noise that isn't directly actionable for types that include a ResolvedVc or OperationVc that is not yet a NonLocalValue.

This PR also adds the NonLocalValue to types explicitly deriving TraceRawVcs, for types that couldn't before, by using the new weaker bounds on the NonLocalValue impls.

Closes PACK-3642

@ijjk ijjk added created-by: Turbopack team PRs by the Turbopack team. Turbopack Related to Turbopack with Next.js. labels Dec 10, 2024
@bgw bgw requested review from kdy1 and mischnic December 10, 2024 21:57
@bgw bgw marked this pull request as ready for review December 10, 2024 21:57
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ijjk commented Dec 10, 2024

Stats from current PR

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ijjk commented Dec 10, 2024

Tests Passed

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bgw commented Dec 11, 2024

Merge activity

  • Dec 11, 11:48 AM EST: Graphite disabled "merge when ready" on this PR due to: a merge conflict with the target branch; resolve the conflict and try again..
  • Dec 11, 2:23 PM EST: A user merged this pull request with Graphite.

@bgw bgw force-pushed the bgw/impl-more-non-local-value branch from a0576b7 to d0e125c Compare December 11, 2024 18:41
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