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refactor(turbopack): Add NonLocalValue derives to types deriving TraceRawVcs #73714

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merged 1 commit into from
Dec 10, 2024

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@bgw bgw commented Dec 10, 2024

Types that implement TraceRawVcs do so because they aren't a VcValueType, but they are used inside of a VcValueType.

We have a similar issue for the NonLocalValue (formerly ResolvedValue) marker trait. We need it to be implemented for all things included inside of VcValueTypes, so that we can know that VcValueTypes do not recursively contain potentially-local Vcs.

I started this PR by adding NonLocalValue to all things that explicitly derive TraceRawVcs:

sg run --lang rust --pattern '#[derive($$$BEFORE TraceRawVcs $$$AFTER)]' --rewrite '#[derive($$$BEFORE TraceRawVcs $$$AFTER, NonLocalValue)]' --update-all
fastmod ',, NonLocalValue' ', NonLocalValue'       # fix up some double comments caused by the astgrep transform above

And then I went through doing the following:

  • Adding imports of NonLocalValue.
  • Removing the NonLocalValue in cases where it's not easy for the struct to implement it yet.
  • Adding non_local options to #[turbo_task::value] macros in places where it would help us derive NonLocalValue somewhere else.
  • In a few cases removed some #[turbo_tasks(trace_ignore)]s in favor of adding a proper TraceRawVcs and NonLocalValue implementations.

Included with this are a few improvements to the turbo-tasks and turbo-tasks-macros crates:

Closes PACK-3639

@ijjk ijjk added created-by: Turbopack team PRs by the Turbopack team. Font (next/font) Related to Next.js Font Optimization. Turbopack Related to Turbopack with Next.js. labels Dec 10, 2024
@bgw bgw requested review from kdy1 and mischnic December 10, 2024 01:47
@bgw bgw marked this pull request as ready for review December 10, 2024 01:47
@bgw bgw changed the base branch from bgw/docs-vc-type to graphite-base/73714 December 10, 2024 18:57
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bgw commented Dec 10, 2024

Merge activity

  • Dec 10, 1:58 PM 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 10, 4:47 PM EST: A user merged this pull request with Graphite.

@bgw bgw force-pushed the bgw/common-types-non-local-value branch from d25fa43 to dc6e704 Compare December 10, 2024 19:16
@bgw bgw force-pushed the graphite-base/73714 branch from 3498e7d to 4074ede Compare December 10, 2024 19:16
@bgw bgw changed the base branch from graphite-base/73714 to canary December 10, 2024 19:16
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ijjk commented Dec 10, 2024

Tests Passed

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ijjk commented Dec 10, 2024

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Commit: 514401c

@bgw bgw force-pushed the bgw/common-types-non-local-value branch from dc6e704 to 514401c Compare December 10, 2024 20:55
@bgw bgw merged commit e098755 into canary Dec 10, 2024
103 of 112 checks passed
@bgw bgw deleted the bgw/common-types-non-local-value branch December 10, 2024 21:47
bgw added a commit that referenced this pull request Dec 11, 2024
…c`s and `OperationVc`s (#73764)

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`:

```diff
- 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 `VcValueType`s 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.
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