Support Result<T, E> across FFI when niche optimization can be used (v2) #124747
+826
−73
Conversation
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Allow allow enums like `Result<T, E>` to be used across FFI if the T/E can be niche optimized and the non-niche-optimized type is FFI safe.
Fields are disallowed so checking the top attribute is enough.
Couldn't find documentation supporting that single-variant
`#[repr(Rust)]` enums with RHS assigned work as expected with this
change.
```rust
enum Variants {
A = 17,
} // Would this be zero sized optimized guaranteed?
```
rustbot
added
S-waiting-on-review
|
@bors r=davidtwco |
bors
added
S-waiting-on-bors
fmease
added a commit
to fmease/rust
that referenced
this pull request
May 5, 2024
Support Result<T, E> across FFI when niche optimization can be used (v2) This PR is identical to rust-lang#122253, which was approved and merged but then removed from master by a force-push due to a [CI bug](https://rust-lang.zulipchat.com/#narrow/stream/242791-t-infra/topic/ci.20broken.3F). r? ghost Original PR description: --- Allow allow enums like `Result<T, E>` to be used across FFI if the T/E can be niche optimized and the non-niche-optimized type is FFI safe. Implementation of rust-lang/rfcs#3391 Tracking issue: rust-lang#110503 Additional ABI and codegen tests were added in rust-lang#115372
bors
added a commit
to rust-lang-ci/rust
that referenced
this pull request
May 5, 2024
Rollup of 6 pull requests Successful merges: - rust-lang#124146 (Triagebot: Rename `macos` ping group to `apple`) - rust-lang#124742 (Add `rustfmt` cfg to well known cfgs list) - rust-lang#124745 (Implement lldb formattter for "clang encoded" enums (LLDB 18.1+) (v2)) - rust-lang#124747 (Support Result<T, E> across FFI when niche optimization can be used (v2)) - rust-lang#124765 ([rustdoc] Fix bad color for setting cog in ayu theme) - rust-lang#124768 ([resubmission] Meta: Enable the brand new triagebot transfer command) r? `@ghost` `@rustbot` modify labels: rollup
fmease
added a commit
to fmease/rust
that referenced
this pull request
May 5, 2024
Support Result<T, E> across FFI when niche optimization can be used (v2) This PR is identical to rust-lang#122253, which was approved and merged but then removed from master by a force-push due to a [CI bug](https://rust-lang.zulipchat.com/#narrow/stream/242791-t-infra/topic/ci.20broken.3F). r? ghost Original PR description: --- Allow allow enums like `Result<T, E>` to be used across FFI if the T/E can be niche optimized and the non-niche-optimized type is FFI safe. Implementation of rust-lang/rfcs#3391 Tracking issue: rust-lang#110503 Additional ABI and codegen tests were added in rust-lang#115372
bors
added a commit
to rust-lang-ci/rust
that referenced
this pull request
May 6, 2024
Rollup of 5 pull requests Successful merges: - rust-lang#124742 (Add `rustfmt` cfg to well known cfgs list) - rust-lang#124747 (Support Result<T, E> across FFI when niche optimization can be used (v2)) - rust-lang#124753 (Migrate `run-make/rustdoc-error-lines` to new `rmake.rs`) - rust-lang#124765 ([rustdoc] Fix bad color for setting cog in ayu theme) - rust-lang#124768 ([resubmission] Meta: Enable the brand new triagebot transfer command) r? `@ghost` `@rustbot` modify labels: rollup
|
☀️ Test successful - checks-actions |
|
Finished benchmarking commit (80420a6): comparison URL. Overall result: no relevant changes - no action needed@rustbot label: -perf-regression Instruction countThis benchmark run did not return any relevant results for this metric. Max RSS (memory usage)ResultsThis is a less reliable metric that may be of interest but was not used to determine the overall result at the top of this comment.
CyclesResultsThis is a less reliable metric that may be of interest but was not used to determine the overall result at the top of this comment.
Binary sizeThis benchmark run did not return any relevant results for this metric. Bootstrap: 675.885s -> 676.339s (0.07%) |
7 tasks
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
This PR is identical to #122253, which was approved and merged but then removed from master by a force-push due to a CI bug.
r? ghost
Original PR description:
Allow allow enums like
Result<T, E>to be used across FFI if the T/E can be niche optimized and the non-niche-optimized type is FFI safe.Implementation of rust-lang/rfcs#3391
Tracking issue: #110503
Additional ABI and codegen tests were added in #115372