Rollup of 6 pull requests #135584
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Rollup of 6 pull requests #135584
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…_count','decrement_strong_count'
Apply eta-reduction on map to simplify code and make the style more consistent
Changes the behavior of the `overflowing_literals` suggestion so that it always suggest the smallest type regardless of the original type size.
The change between 0.1.143 and 0.1.144 includes refactoring that was in compiler-builtins before, but had to be reverted before landing in rust-lang/rust because the traits were leaking into diagnostics [1]. Recently a fix for this issue was merged [2] so the cleanup is reapplied here. This also acts as a regression test for [2]. [1]: rust-lang#128691 (comment) [2]: rust-lang#135278
Co-authored-by: Ibraheem Ahmed <ibraheem@ibraheem.ca>
…joshtriplett [cfg_match] Adjust syntax A year has passed since the creation of rust-lang#115585 and the feature, as expected, is not moving forward. Let's change that. This PR proposes changing the arm's syntax from `cfg(SOME_CONDITION) => { ... }` to `SOME_CODITION => {}`. ```rust match_cfg! { unix => { fn foo() { /* unix specific functionality */ } } target_pointer_width = "32" => { fn foo() { /* non-unix, 32-bit functionality */ } } _ => { fn foo() { /* fallback implementation */ } } } ``` Why? Because after several manual migrations in rust-lang#116342 it became clear, at least for me, that `cfg` prefixes are unnecessary, verbose and redundant. Again, everything is just a proposal to move things forward. If the shown syntax isn't ideal, feel free to close this PR or suggest other alternatives.
Update documentation for Arc::from_raw, Arc::increment_strong_count, and Arc::decrement_strong_count to clarify allocator requirement ### Related Issue: This update addresses parts of the issue raised in [rust-lang#134242](rust-lang#134242), where Arc's documentation lacks `Global Allocator` safety descriptions for three APIs. And this was confirmed by ``@workingjubilee`` : > Wait, nevermind. I apparently forgot the `increment_strong_count` is implicitly A = Global. Ugh. Another reason these things are hard to track, unfortunately. ### PR Description This PR updates the document for the following APIs: - `Arc::from_raw` - `Arc::increment_strong_count` - `Arc::decrement_strong_count` These APIs currently lack an important piece of documentation: **the raw pointer must point to a block of memory allocated by the global allocator**. This crucial detail is specified in the source code but is not reflected in the documentation, which could lead to confusion or incorrect usage by users. ### Problem: The following example demonstrates the potential confusion caused by the lack of documentation: ```rust #![feature(allocator_api)] use std::alloc::{Allocator,AllocError, Layout}; use std::ptr::NonNull; use std::sync::Arc; struct LocalAllocator { memory: NonNull<u8>, size: usize, } impl LocalAllocator { fn new(size: usize) -> Self { Self { memory: unsafe { NonNull::new_unchecked(&mut 0u8 as *mut u8) }, size, } } } unsafe impl Allocator for LocalAllocator { fn allocate(&self, _layout: Layout) -> Result<NonNull<[u8]>, AllocError> { Ok(NonNull::slice_from_raw_parts(self.memory, self.size)) } unsafe fn deallocate(&self, _ptr: NonNull<u8>, _layout: Layout) { } } fn main() { let allocator = LocalAllocator::new(64); let arc = Arc::new_in(5, &allocator); // Here, allocator could be any non-global allocator let ptr = Arc::into_raw(arc); unsafe { Arc::increment_strong_count(ptr); let arc = Arc::from_raw(ptr); assert_eq!(2, Arc::strong_count(&arc)); // Failed here! } } ```
…als-help, r=chenyukang Fix overflows in the implementation of `overflowing_literals` lint's help This PR fixes two overflow problems that cause the `overflowing_literals` lint to behave incorrectly in some edge cases. 1. When an integer literal is between `i128::MAX` and `u128::MAX`, an overflowing `as` cast can cause the suggested type to be overly small. It's fixed by using checked type conversion and returning `u128` when it's the only choice. (Fixes rust-lang#135248) 2. When an integer literal is `i128::MIN` but is of a smaller type, an overflowing negation cause the compiler to panic in debug build. Fixed by checking the number size beforehand and `wrapping_neg`. (Fixes rust-lang#131849) Edit: extracted the type conversion part into a standalone function to separate the concern of overflowing.
Only treat plain literal patterns as short See rust-lang#134228 (comment) and rust-lang#134228 (comment) for context. We never wanted to treat const blocks and paths as short, only plain literals. I don't know how to write a test for this, it.s not clear to me how the short pattern check actually affects the formatting
Clarify note in `std::sync::LazyLock` example I doubt most people know what it means, as I did not until a week ago. In the current form, it seems like a `TODO:`.
Update `compiler-builtins` to 0.1.144 The change between 0.1.143 and 0.1.144 includes refactoring that was in compiler-builtins before, but had to be reverted before landing in rust-lang/rust because the traits were leaking into diagnostics [1]. Recently a fix for this issue was merged [2] so the cleanup is reapplied here. This also acts as a regression test for [2]. [1]: rust-lang#128691 (comment) [2]: rust-lang#135278
rustbot added S-waiting-on-review | @bors r+ rollup=never p=6 |
bors added S-waiting-on-bors 
| I'm pretty sure this will fail again due to #135560 |
| Also, bors is stuck? |
bors added a commit to rust-lang-ci/rust that referenced this pull request Jan 16, 2025
…iaskrgr Rollup of 6 pull requests Successful merges: - rust-lang#133720 ([cfg_match] Adjust syntax) - rust-lang#134496 (Update documentation for Arc::from_raw, Arc::increment_strong_count, and Arc::decrement_strong_count to clarify allocator requirement) - rust-lang#135249 (Fix overflows in the implementation of `overflowing_literals` lint's help) - rust-lang#135251 (Only treat plain literal patterns as short) - rust-lang#135556 (Clarify note in `std::sync::LazyLock` example) - rust-lang#135560 (Update `compiler-builtins` to 0.1.144) r? `@ghost` `@rustbot` modify labels: rollup
| yeet |
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Successful merges:
overflowing_literalslint's help #135249 (Fix overflows in the implementation ofoverflowing_literalslint's help)std::sync::LazyLockexample #135556 (Clarify note instd::sync::LazyLockexample)compiler-builtinsto 0.1.144 #135560 (Updatecompiler-builtinsto 0.1.144)r? @ghost
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