Resolve: refactor `define` into `define_local` and `define_extern` #143884

LorrensP-2158466 · 2025-07-13T11:08:38Z

Follow up on #143550 and part of #gsoc > Project: Parallel Macro Expansion.

Split up define into define_local and define_extern. Refactor usages of define into either one where it's "correct" (idk if everything is correct atm). Big part of this is that resolution can now take a &Resolver instead of a mutable one.

r? @petrochenkov

compiler/rustc_resolve/src/build_reduced_graph.rs

compiler/rustc_resolve/src/imports.rs

compiler/rustc_resolve/src/lib.rs

compiler/rustc_resolve/src/imports.rs

LorrensP-2158466 · 2025-07-13T20:35:22Z

Conflicts must be resolved in Petrochenkov's PRs, I think. I can then rebase off that.

petrochenkov · 2025-07-14T13:21:34Z

Blocked on #143550.
@rustbot blocked

compiler/rustc_resolve/src/build_reduced_graph.rs

resolve: Use interior mutability for extern module map Module map for extern modules is a lazily populated cache, it's not *significantly* mutable. If some logic in name resolver is parallelized, then this cache can be populated from any thread, and without affecting results of any speculative resolution. Unblocks rust-lang#143884. This is a part of [#gsoc > Project: Parallel Macro Expansion](https://rust-lang.zulipchat.com/#narrow/channel/421156-gsoc/topic/Project.3A.20Parallel.20Macro.20Expansion/with/527348747). cc `@LorrensP-2158466`

Rollup merge of #143550 - petrochenkov:lessmutres, r=lcnr resolve: Use interior mutability for extern module map Module map for extern modules is a lazily populated cache, it's not *significantly* mutable. If some logic in name resolver is parallelized, then this cache can be populated from any thread, and without affecting results of any speculative resolution. Unblocks #143884. This is a part of [#gsoc > Project: Parallel Macro Expansion](https://rust-lang.zulipchat.com/#narrow/channel/421156-gsoc/topic/Project.3A.20Parallel.20Macro.20Expansion/with/527348747). cc `@LorrensP-2158466`

LorrensP-2158466 · 2025-07-17T18:49:56Z

I couldn't find any more &mut Resolver that I could turn into &Resolver. Everything now either has finalize codepaths and/or lints/errors getting added to their respective collections.

resolve: Make disambiguators for underscore bindings module-local Disambiguators attached to underscore name bindings (like `const _: u8 = something;`) do not need to be globally unique, they just need to be unique inside the module in which they live, because the bindings in a module are basically kept as `Map<BindingKey, SomeData>`. Also, the specific values of the disambiguators are not important, so a glob import of `const _` may have a different disambiguator than the original `const _` itself. So in this PR the disambiguator is just set to the current number of bindings in the module. This removes one more piece of global mutable state from resolver and unblocks rust-lang#143884.

resolve: Use interior mutability for extern module map Module map for extern modules is a lazily populated cache, it's not *significantly* mutable. If some logic in name resolver is parallelized, then this cache can be populated from any thread, and without affecting results of any speculative resolution. Unblocks rust-lang/rust#143884. This is a part of [#gsoc > Project: Parallel Macro Expansion](https://rust-lang.zulipchat.com/#narrow/channel/421156-gsoc/topic/Project.3A.20Parallel.20Macro.20Expansion/with/527348747). cc `@LorrensP-2158466`

resolve: Make disambiguators for underscore bindings module-local Disambiguators attached to underscore name bindings (like `const _: u8 = something;`) do not need to be globally unique, they just need to be unique inside the module in which they live, because the bindings in a module are basically kept as `Map<BindingKey, SomeData>`. Also, the specific values of the disambiguators are not important, so a glob import of `const _` may have a different disambiguator than the original `const _` itself. So in this PR the disambiguator is just set to the current number of bindings in the module. This removes one more piece of global mutable state from resolver and unblocks rust-lang#143884.

Rollup merge of #144013 - petrochenkov:disambunder, r=oli-obk resolve: Make disambiguators for underscore bindings module-local Disambiguators attached to underscore name bindings (like `const _: u8 = something;`) do not need to be globally unique, they just need to be unique inside the module in which they live, because the bindings in a module are basically kept as `Map<BindingKey, SomeData>`. Also, the specific values of the disambiguators are not important, so a glob import of `const _` may have a different disambiguator than the original `const _` itself. So in this PR the disambiguator is just set to the current number of bindings in the module. This removes one more piece of global mutable state from resolver and unblocks #143884.

petrochenkov · 2025-07-25T15:22:59Z

r=me after squashing commits.
@bors delegate+
@rustbot author

bors · 2025-07-25T15:23:02Z

✌️ @LorrensP-2158466, you can now approve this pull request!

If @petrochenkov told you to "r=me" after making some further change, please make that change, then do @bors r=@petrochenkov

LorrensP-2158466 · 2025-07-25T15:36:20Z

@bors r=@petrochenkov

bors · 2025-07-25T15:36:22Z

📌 Commit e889081 has been approved by petrochenkov

It is now in the queue for this repository.

…ochenkov Resolve: refactor `define` into `define_local` and `define_extern` Follow up on #143550 and part of [#gsoc > Project: Parallel Macro Expansion](https://rust-lang.zulipchat.com/#narrow/channel/421156-gsoc/topic/Project.3A.20Parallel.20Macro.20Expansion/with/527348747). Split up `define` into `define_local` and `define_extern`. Refactor usages of `define` into either one where it's "correct" (idk if everything is correct atm). Big part of this is that `resolution` can now take a `&Resolver` instead of a mutable one. r? `@petrochenkov`

bors · 2025-07-27T06:27:57Z

⌛ Testing commit e889081 with merge 82f7da2...

petrochenkov · 2025-07-27T08:29:10Z

Needs a rebase.
@rustbot author

LorrensP-2158466 · 2025-07-27T10:18:32Z

@rustbot ready

petrochenkov · 2025-07-27T11:12:45Z

@bors r+

bors · 2025-07-27T11:12:47Z

📌 Commit 451a93e has been approved by petrochenkov

It is now in the queue for this repository.

…ochenkov Resolve: refactor `define` into `define_local` and `define_extern` Follow up on #143550 and part of [#gsoc > Project: Parallel Macro Expansion](https://rust-lang.zulipchat.com/#narrow/channel/421156-gsoc/topic/Project.3A.20Parallel.20Macro.20Expansion/with/527348747). Split up `define` into `define_local` and `define_extern`. Refactor usages of `define` into either one where it's "correct" (idk if everything is correct atm). Big part of this is that `resolution` can now take a `&Resolver` instead of a mutable one. r? `@petrochenkov`

bors · 2025-07-27T12:40:49Z

⌛ Testing commit 451a93e with merge edc3841...

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resolve: Make disambiguators for underscore bindings module-local #144013

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split up define into define_extern and define_local

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Resolve: refactor define into define_local and define_extern #143884

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Resolve: refactor `define` into `define_local` and `define_extern` #143884

Resolve: refactor `define` into `define_local` and `define_extern` #143884

LorrensP-2158466 commented Jul 13, 2025 •

edited by petrochenkov

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