copysign with sign being a NaN can have non-portable results
Follow-up to https://github.com/rust-lang/rust/pull/129559.
Cc ```@tgross35``` ```@beetrees```
There's no portable variant we can recommend instead here, is there? Something with a semantics like "if `sign` is a NaN, then return `self` unaltered, otherwise return `self` with the sign changed to that of `sign`"?
Add fmt::Debug to sync::Weak<T, A>
Currently, `sync::Weak<T>` implements `Debug`, but `sync::Weak<T, A>` does not. This appears to be an oversight, as `rc::Weak<T, A>` implements `Debug`. (Note: `sync::Weak` is the weak for `Arc`, and `rc::Weak` is the weak for `Rc`.)
This PR adds the Debug trait for `sync::Weak<T, A>`. The issue was initially brought up here: https://github.com/rust-lang/wg-allocators/issues/131
Update books
## rust-lang/book
4 commits in 04bc1396bb857f35b5dda1d773c9571e1f253304..e7d217be2a75ef1753f0988d6ccaba4d7e376259
2024-08-14 01:19:47 UTC to 2024-08-13 16:51:00 UTC
- Backport/forward port ch12 (rust-lang/book#4008)
- Found some more things to fix in ch7; I forgot to update the snapshot (rust-lang/book#4007)
- Remove redundant sentence. Send to nostarch (rust-lang/book#4006)
- Fix: typo (rust-lang/book#4003)
## rust-lang/edition-guide
5 commits in aeeb287d41a0332c210da122bea8e0e91844ab3e..eeba2cb9c37ab74118a4fb5e5233f7397e4a91f8
2024-08-19 23:28:06 UTC to 2024-08-15 15:12:33 UTC
- 2024: Add rustdoc combined doctests (rust-lang/edition-guide#320)
- Update for unsafe attributes stabilization (rust-lang/edition-guide#319)
- 2024: Add macro-fragment-specifiers. (rust-lang/edition-guide#312)
- Fix deprecated_safe_2024 link (rust-lang/edition-guide#317)
- Add 2024 unsafe functions (rust-lang/edition-guide#304)
## rust-embedded/book
1 commits in 019f3928d8b939ec71b63722dcc2e46330156441..ff5d61d56f11e1986bfa9652c6aff7731576c37d
2024-08-20 07:26:19 UTC to 2024-08-20 07:26:19 UTC
- Use aligned address to demonstrate HardFault (rust-embedded/book#374)
## rust-lang/nomicon
1 commits in 6ecf95c5f2bfa0e6314dfe282bf775fd1405f7e9..14649f15d232d509478206ee9ed5105641aa60d0
2024-08-14 14:49:09 UTC to 2024-08-14 14:49:09 UTC
- CI: Switch to merge queue (rust-lang/nomicon#459)
## rust-lang/reference
14 commits in 62cd0df95061ba0ac886333f5cd7f3012f149da1..0668397076da350c404dadcf07b6cbc433ad3743
2024-08-11 21:06:12 +0000 to 2024-08-27 21:47:20 +0000
- Update enum.md (rust-lang/reference#1354)
- Be consistent about how "Edition differences" is capitalized (rust-lang/reference#1586)
- Sync denied lints with upstream (rust-lang/reference#1589)
- const_eval: update for const-fn float stabilization (rust-lang/reference#1566)
- Add spec identifier syntax to destructors.md (rust-lang/reference#1571)
- Say that `pub(in path)` can't depend on `use` statements (rust-lang/reference#1559)
- bytes inside implicitly const-promoted expressions are immutable (rust-lang/reference#1554)
- Tweak `repr(transparent)` to mention requiring *at most* one non-1-ZST (rust-lang/reference#1568)
- operator expressions: add &raw (rust-lang/reference#1567)
- Rewrite the automatic std link translation, and switch to automatic links (rust-lang/reference#1578)
- Add some basic docs for unsafe attrs (rust-lang/reference#1539)
- don't capitalize Undefined Behavior (rust-lang/reference#1575)
- add the `const` operand to docs for inline assembly (rust-lang/reference#1556)
- Typo: 'a' to 'an' in type-coercions.md (rust-lang/reference#1572)
## rust-lang/rust-by-example
1 commits in 8f94061936e492159f4f6c09c0f917a7521893ff..859786c5bc99301bbc22fc631a5c2b341860da08
2024-08-26 10:30:48 UTC to 2024-08-26 10:30:48 UTC
- Update primitives.md with examples (rust-lang/rust-by-example#1878)
## rust-lang/rustc-dev-guide
7 commits in 43d83780db545a1ed6d45773312fc578987e3968..fa928a6d19e1666d8d811dfe3fd35cdad3b4e459
2024-08-26 14:46:50 UTC to 2024-08-12 21:07:49 UTC
- Fix x.py reference (rust-lang/rustc-dev-guide#2049)
- Update `stabilization_guide.md` (rust-lang/rustc-dev-guide#2034)
- Explain the internal `#[rustc_*]` TEST attributes used for debugging and inside tests (rust-lang/rustc-dev-guide#2046)
- missing char (rust-lang/rustc-dev-guide#2047)
- Replace direct http links to rustc-dev-guide.rust-lang.org (rust-lang/rustc-dev-guide#2044)
- Update index.html, 39. The MIR: fix typo (rust-lang/rustc-dev-guide#2043)
- Update LLVM docs (rust-lang/rustc-dev-guide#2039)
derive(SmartPointer): assume pointee from the single generic and better error messages
Fix #129465
Actually RFC says that `#[pointee]` can be inferred when there is no ambiguity, or there is only one generic type parameter so to say.
cc ```@Darksonn```
r? ```@compiler-errors```
Clean up cfg-gating of ProcessPrng extern
This removes a bit of duplication and is consistent with how `api-ms-win-core-synch-l1-2-0` externs are imported.
Emit specific message for time<=0.3.35
```
error[E0282]: type annotations needed for `Box<_>`
--> /home/gh-estebank/.cargo/registry/src/index.crates.io-6f17d22bba15001f/time-0.3.34/src/format_description/parse/mod.rs:83:9
|
83 | let items = format_items
| ^^^^^
...
86 | Ok(items.into())
| ---- type must be known at this point
|
= note: this is an inference error on `time` caused by a change in Rust 1.80.0; update `time` to version `>=0.3.36`
```
Partially mitigate the fallout from https://github.com/rust-lang/rust/issues/127343. Although the biggest benefit of this would have been if we had had this in 1.80 before it became stable, the long-tail of that change will be felt for a *long* time, so better late than never.
We can also emit an even more targeted error instead of this inference failure.
Add an ability to convert between `Span` and `visit::Location`
AFAIK, there is no way to create a `Location` from a `Span` because its only field is private. This makes it impossible to use visitor methods like `visit_statement` or `visit_terminator`.
This PR adds an implementation for`From<Span>` for `Location` to fix this.
r? ```@celinval```
rustc_target: Add various aarch64 features
Add various aarch64 features already supported by LLVM and Linux.
Additionally include some comment fixes to ensure consistency of feature names with the Arm ARM.
Compiler support for features added to stdarch by https://github.com/rust-lang/stdarch/pull/1614.
Tracking issue for unstable aarch64 features is https://github.com/rust-lang/rust/issues/127764.
List of added features:
- FEAT_CSSC
- FEAT_ECV
- FEAT_FAMINMAX
- FEAT_FLAGM2
- FEAT_FP8
- FEAT_FP8DOT2
- FEAT_FP8DOT4
- FEAT_FP8FMA
- FEAT_HBC
- FEAT_LSE128
- FEAT_LSE2
- FEAT_LUT
- FEAT_MOPS
- FEAT_LRCPC3
- FEAT_SVE_B16B16
- FEAT_SVE2p1
- FEAT_WFxT
- FEAT_SME
- FEAT_SME_F16F16
- FEAT_SME_F64F64
- FEAT_SME_F8F16
- FEAT_SME_F8F32
- FEAT_SME_FA64
- FEAT_SME_I16I64
- FEAT_SME_LUTv2
- FEAT_SME2
- FEAT_SME2p1
- FEAT_SSVE_FP8DOT2
- FEAT_SSVE_FP8DOT4
- FEAT_SSVE_FP8FMA
FEAT_FPMR is added in the first commit and then removed in a separate one to highlight it being removed from upstream LLVM 19. The intention is for it to be detectable at runtime through stdarch but not have a corresponding Rust compile-time feature.
Implement a first version of RFC 3525: struct target features
This PR is an attempt at implementing https://github.com/rust-lang/rfcs/pull/3525, behind a feature gate `struct_target_features`.
There's obviously a few tasks that ought to be done before this is merged; in no particular order:
- add proper error messages
- add tests
- create a tracking issue for the RFC
- properly serialize/deserialize the new target_features field in `rmeta` (assuming I even understood that correctly :-))
That said, as I am definitely not a `rustc` expert, I'd like to get some early feedback on the overall approach before fixing those things (and perhaps some pointers for `rmeta`...), hence this early PR :-)
Here's an example piece of code that I have been using for testing - with the new code, the calls to intrinsics get correctly inlined:
```rust
#![feature(struct_target_features)]
use std::arch::x86_64::*;
/*
// fails to compile
#[target_feature(enable = "avx")]
struct Invalid(u32);
*/
#[target_feature(enable = "avx")]
struct Avx {}
#[target_feature(enable = "sse")]
struct Sse();
/*
// fails to compile
extern "C" fn bad_fun(_: Avx) {}
*/
/*
// fails to compile
#[inline(always)]
fn inline_fun(_: Avx) {}
*/
trait Simd {
fn do_something(&self);
}
impl Simd for Avx {
fn do_something(&self) {
unsafe {
println!("{:?}", _mm256_setzero_ps());
}
}
}
impl Simd for Sse {
fn do_something(&self) {
unsafe {
println!("{:?}", _mm_setzero_ps());
}
}
}
struct WithAvx {
#[allow(dead_code)]
avx: Avx,
}
impl Simd for WithAvx {
fn do_something(&self) {
unsafe {
println!("{:?}", _mm256_setzero_ps());
}
}
}
#[inline(never)]
fn dosomething<S: Simd>(simd: &S) {
simd.do_something();
}
fn main() {
/*
// fails to compile
Avx {};
*/
if is_x86_feature_detected!("avx") {
let avx = unsafe { Avx {} };
dosomething(&avx);
dosomething(&WithAvx { avx });
}
if is_x86_feature_detected!("sse") {
dosomething(&unsafe { Sse {} })
}
}
```
Tracking:
- https://github.com/rust-lang/rust/issues/129107
```
error[E0282]: type annotations needed for `Box<_>`
--> ~/.cargo/registry/src/index.crates.io-6f17d22bba15001f/time-0.3.34/src/format_description/parse/mod.rs:83:9
|
83 | let items = format_items
| ^^^^^
...
86 | Ok(items.into())
| ---- type must be known at this point
|
= note: this is an inference error on crate `time` caused by a change in Rust 1.80.0; update `time` to version `>=0.3.35`
```
Partially address #127343.
Rollup of 11 pull requests
Successful merges:
- #129421 (add repr to the allowlist for naked functions)
- #129480 (docs: correct panic conditions for rem_euclid and similar functions)
- #129551 (ub_checks intrinsics: fall back to cfg(ub_checks))
- #129608 (const-eval: do not make UbChecks behavior depend on current crate's flags)
- #129613 (interpret: do not make const-eval query result depend on tcx.sess)
- #129641 (rustdoc: fix missing resource suffix on `crates.js`)
- #129657 (Rename `BikeshedIntrinsicFrom` to `TransmuteFrom`)
- #129666 (interpret: add missing alignment check in raw_eq)
- #129667 (Rustc driver cleanup)
- #129668 (Fix Pin::set bounds regression)
- #129686 (coverage: Rename `CodeRegion` to `SourceRegion`)
r? `@ghost`
`@rustbot` modify labels: rollup
coverage: Rename `CodeRegion` to `SourceRegion`
LLVM uses the word "code" to refer to a particular kind of coverage mapping. This unrelated usage of the word is confusing, and makes it harder to introduce types whose names correspond to the LLVM classification of coverage kinds.
No functional changes.
Rename `BikeshedIntrinsicFrom` to `TransmuteFrom`
As our implementation of MCP411 nears completion and we begin to solicit testing, it's no longer reasonable to expect testers to type or remember `BikeshedIntrinsicFrom`. The name degrades the ease-of-reading of documentation, and the overall experience of using compiler safe transmute.
Tentatively, we'll instead adopt `TransmuteFrom`.
This name seems to be the one most likely to be stabilized, after discussion on Zulip [1]. We may want to revisit the ordering of `Src` and `Dst` before stabilization, at which point we'd likely consider `TransmuteInto` or `Transmute`.
[1] https://rust-lang.zulipchat.com/#narrow/stream/216762-project-safe-transmute/topic/What.20should.20.60BikeshedIntrinsicFrom.60.20be.20named.3F
Tracking Issue: https://github.com/rust-lang/rust/issues/99571
r? `@compiler-errors`
interpret: do not make const-eval query result depend on tcx.sess
The check against calling functions with missing target features uses `tcx.sess` to determine which target features are available. However, this can differ between different crates in a crate graph, so the same const-eval query can come to different conclusions about whether a constant evaluates successfully or not -- which is bad, we should consistently get the same result everywhere.
const-eval: do not make UbChecks behavior depend on current crate's flags
Fixes https://github.com/rust-lang/rust/issues/129552
Let's see if we can get away with just always enabling these checks.
ub_checks intrinsics: fall back to cfg(ub_checks)
Not sure why the fallback body uses `debug_assertions`, probably a leftover from when `cfg!(ub_checks)` did not exist yet?
r? `@saethlin`
add repr to the allowlist for naked functions
Fixes #129412 (combining unstable features #90957 (`#![feature(naked_functions)]`) and #82232 (`#![feature(fn_align)]`)
Tweak some attributes to improve panic_immediate_abort
This is similar to https://github.com/rust-lang/rust/pull/117332; I did the same approach as before where I build a really big project with `-Zbuild-std -Zbuild-std-features=panic_immediate_abort` and grep its symbols for things that look panic-related.
LLVM uses the word "code" to refer to a particular kind of coverage mapping.
This unrelated usage of the word is confusing, and makes it harder to introduce
types whose names correspond to the LLVM classification of coverage kinds.
Get rid of `predicates_defined_on`
This is the uncontroversial part of #129532. This simply inlines the `predicates_defined_on` into into `predicates_of`. Nothing should change here logically.
Stop storing a special inner body for the coroutine by-move body for async closures
...and instead, just synthesize an item which is treated mostly normally by the MIR pipeline.
This PR does a few things:
* We synthesize a new `DefId` for the by-move body of a closure, which has its `mir_built` fed with the output of the `ByMoveBody` MIR transformation, and some other relevant queries.
* This has the `DefKind::ByMoveBody`, which we use to distinguish it from "real" bodies (that come from HIR) which need to be borrowck'd. Introduce `TyCtxt::is_synthetic_mir` to skip over `mir_borrowck` which is called by `mir_promoted`; borrowck isn't really possible to make work ATM since it heavily relies being called on a body generated from HIR, and is redundant by the construction of the by-move-body.
* Remove the special `PassManager` hacks for handling the inner `by_move_body` stored within the coroutine's mir body. Instead, this body is fed like a regular MIR body, so it's goes through all of the `tcx.*_mir` stages normally (build -> promoted -> ...etc... -> optimized) ✨.
* Remove the `InstanceKind::ByMoveBody` shim, since now we have a "regular" def id, we can just use `InstanceKind::Item`. This also allows us to remove the corresponding hacks from codegen, such as in `fn_sig_for_fn_abi` ✨.
Notable remarks:
* ~~I know it's kind of weird to be using `DefKind::Closure` here, since it's not a distinct closure but just a new MIR body. I don't believe it really matters, but I could also use a different `DefKind`... maybe one that we could use for synthetic MIR bodies in general?~~ edit: We're doing this now.
A partial stabilization that only affects:
- AllocType<T>::new_uninit
- AllocType<T>::assume_init
- AllocType<[T]>::new_uninit_slice
- AllocType<[T]>::assume_init
where "AllocType" is Box, Rc, or Arc
Fix typos in floating-point primitive type docs
Fixes a few typos. Also reflows the text of a couple of paragraphs in the source code to the standard line width to make the source easier to read (will have no effect on the rendered documentation).
