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(cherry picked from commit 81d6660d28c2288606dbbf1e2aa238b1309eb6aa)
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This reverts commit a8ecb79d19e1bad732dae7f34f2481499db12f7c, reversing
changes made to 40c4e05013c1805044ae2611ba0b95c0acecd331.
(cherry picked from commit 9ea587e023dfa4458c5003ba74ae02bd146ec2df)
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(cherry picked from commit 8089fce101f4ac2ed68c8df080c61102b0210429)
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(cherry picked from commit 28d3fef3991d52cf7bf3908944191d86b487a815)
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(cherry picked from commit bad8e98c7d0ed217b58362e61ae4357e5344d995)
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(cherry picked from commit bab03bf1768fea8512ece42dea6d66f6f4743145)
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add x86-sse2 (32bit) ABI that requires SSE2 target feature
This is the first commit of https://github.com/rust-lang/rust/pull/135408:
The primary goal of this is to make SSE2 required for our i686 targets (at least for the ones that use Pentium 4 as their baseline), to ensure they cannot be affected by https://github.com/rust-lang/rust/issues/114479. This has been MCPd in https://github.com/rust-lang/compiler-team/issues/808, and is tracked in https://github.com/rust-lang/rust/issues/133611.
We do this by defining a new ABI that these targets select, and making SSE2 required by the ABI (that's the first commit). That's kind of a hack, but it is the easiest way to make a target feature required via the target spec. In a follow-up change (https://github.com/rust-lang/rust/pull/135408), we can actually make use of SSE2 for the ABI, but that is running into some infrastructure issues.
r? `@workingjubilee`
try-job: aarch64-apple
try-job: aarch64-gnu
try-job: aarch64-gnu-debug
try-job: test-various
try-job: x86_64-gnu-nopt
try-job: dist-i586-gnu-i586-i686-musl
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r=saethlin
Normalize closure instance before eagerly monomorphizing it
We were monomorphizing two versions of the closure (or in the original issue, coroutine) -- one with normalized captures and one with unnormalized captures. This led to a symbol collision.
Fixes #137009
r? `@saethlin` or reassign
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Add a new check-pass UI test for returning `impl Fn(T) -> impl Trait`
This PR closes #107883 by adding a ui test.
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Fix presentation of purely "additive" replacement suggestion parts
#127541 changes replacement suggestions to use the "diff" view always, which I think is really verbose in cases where a replacement snippet is a "superset" of the snippet that is being replaced.
Consider:
```
LL - Self::Baz: Clone,
LL + Self::Baz: Clone, T: std::clone::Clone
```
In this code, we suggest replacing `", "` with `", T: std::clone::Clone"`. This is a consequence of how the snippet is constructed. I believe that since the string that is being replaced is a subset of the replacement string, it's not providing much value to present this as a diff. Users should be able to clearly understand what's being suggested here using the `~` underline view we've been suggesting for some time now.
Given that this affects ~100 tests out of the ~1000 UI tests affected, I expect this to be a pretty meaningful improvement of the fallout of #127541.
---
In the last commit, this PR also "trims" replacement parts so that they are turned into their purely additive subset, if possible. See the diff for what this means.
---
r? estebank
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account for `c_enum_min_bits` in `multiple-reprs` UI test
fixes #135777
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Change description from compiletest to regression test
Co-authored-by: 许杰友 Jieyou Xu (Joe) <39484203+jieyouxu@users.noreply.github.com>
Improve test name, location, and description
Update tests/ui/impl-trait/impl-fn-rpit-opaque-107883.rs
Co-authored-by: waffle <waffle.lapkin@gmail.com>
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Rollup of 9 pull requests
Successful merges:
- #135439 (Make `-O` mean `OptLevel::Aggressive`)
- #136460 (Simplify `rustc_span` `analyze_source_file`)
- #136904 (add `IntoBounds` trait)
- #136908 ([AIX] expect `EINVAL` for `pthread_mutex_destroy`)
- #136924 (Add profiling of bootstrap commands using Chrome events)
- #136951 (Use the right binder for rebinding `PolyTraitRef`)
- #136981 (ci: switch loongarch jobs to free runners)
- #136992 (Update backtrace)
- #136993 ([cg_llvm] Remove dead error message)
r? `@ghost`
`@rustbot` modify labels: rollup
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Use the right binder for rebinding `PolyTraitRef`
Fixes #136940
I committed a slightly different test which still demonstrates the issue.
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eagerly prove WF when resolving fully qualified paths
fixes https://github.com/rust-lang/trait-system-refactor-initiative/issues/161.
This hopefully shouldn't impact perf. I do think we need to deal with at least part of the fallout here, opening for vibes.
r? ``@compiler-errors``
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Fix diagnostic when using = instead of : in let binding
Fixes #133713
r? ``@estebank``
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Rollup of 8 pull requests
Successful merges:
- #134999 (Add cygwin target.)
- #136559 (Resolve named regions when reporting type test failures in NLL)
- #136660 (Use a trait to enforce field validity for union fields + `unsafe` fields + `unsafe<>` binder types)
- #136858 (Parallel-compiler-related cleanup)
- #136881 (cg_llvm: Reduce visibility of all functions in the llvm module)
- #136888 (Always perform discr read for never pattern in EUV)
- #136948 (Split out the `extern_system_varargs` feature)
- #136949 (Fix import in bench for wasm)
r? `@ghost`
`@rustbot` modify labels: rollup
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r=compiler-errors
Split out the `extern_system_varargs` feature
After the stabilization PR was opened, `extern "system"` functions were added to `extended_varargs_abi_support`. This has a number of questions regarding it that were not discussed and were somewhat surprising. It deserves to be considered as its own feature, separate from `extended_varargs_abi_support`.
Tracking issue:
- https://github.com/rust-lang/rust/issues/136946
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Always perform discr read for never pattern in EUV
Always perform a read of `!` discriminants to ensure that it's captured by closures in expr use visitor
Fixes #136852
r? Nadrieril or reassign
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Use a trait to enforce field validity for union fields + `unsafe` fields + `unsafe<>` binder types
This PR introduces a new, internal-only trait called `BikeshedGuaranteedNoDrop`[^1] to faithfully model the field check that used to be implemented manually by `allowed_union_or_unsafe_field`.
https://github.com/rust-lang/rust/blob/942db6782f4a28c55b0b75b38fd4394d0483390f/compiler/rustc_hir_analysis/src/check/check.rs#L84-L115
Copying over the doc comment from the trait:
```rust
/// Marker trait for the types that are allowed in union fields, unsafe fields,
/// and unsafe binder types.
///
/// Implemented for:
/// * `&T`, `&mut T` for all `T`,
/// * `ManuallyDrop<T>` for all `T`,
/// * tuples and arrays whose elements implement `BikeshedGuaranteedNoDrop`,
/// * or otherwise, all types that are `Copy`.
///
/// Notably, this doesn't include all trivially-destructible types for semver
/// reasons.
///
/// Bikeshed name for now.
```
As far as I am aware, there's no new behavior being guaranteed by this trait, since it operates the same as the manually implemented check. We could easily rip out this trait and go back to using the manually implemented check for union fields, however using a trait means that this code can be shared by WF for `unsafe<>` binders too. See the last commit.
The only diagnostic changes are that this now fires false-negatives for fields that are ill-formed. I don't consider that to be much of a problem though.
r? oli-obk
[^1]: Please let's not bikeshed this name lol. There's no good name for `ValidForUnsafeFieldsUnsafeBindersAndUnionFields`.
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compiler-errors:resolve-regions-for-type-test-failure, r=BoxyUwU
Resolve named regions when reporting type test failures in NLL
Just a improvement tweak to an error message that I broke out of a bigger PR that I had to close lol
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r=chenyukang,workingjubilee
Add cygwin target.
This PR simply adds cygwin target together with msys2 target, based on ````@ookiineko```` 's (the account has been deleted) [work](https://github.com/ookiineko-cygport/rust) on cygwin target. My full work is here: https://github.com/rust-lang/rust/compare/master...Berrysoft:rust:dev/cygwin
I have succeeded in building a new rustc for cygwin target, and eventually distributed a new version of [fish-shell](https://github.com/Berrysoft/fish-shell/releases) (rewritten by Rust) for MSYS2.
I will open a new PR to fix std if this PR is accepted.
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After the stabilization PR was opened, `extern "system"` functions were
added to `extended_varargs_abi_support`. This has a number of questions
regarding it that were not discussed and were somewhat surprising.
It deserves to be considered as its own feature, separate from
`extended_varargs_abi_support`.
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Rollup of 12 pull requests
Successful merges:
- #134090 (Stabilize target_feature_11)
- #135025 (Cast allocas to default address space)
- #135841 (Reject `?Trait` bounds in various places where we unconditionally warned since 1.0)
- #136217 (Mark condition/carry bit as clobbered in C-SKY inline assembly)
- #136699 (std: replace the `FromInner` implementation for addresses with private conversion functions)
- #136806 (Fix cycle when debug-printing opaque types from RPITIT)
- #136807 (compiler: internally merge `PtxKernel` into `GpuKernel`)
- #136818 (Implement `read*_exact` for `std:io::repeat`)
- #136927 (Correctly escape hashtags when running `invalid_rust_codeblocks` lint)
- #136937 (Update books)
- #136945 (Add diagnostic item for `std::io::BufRead`)
- #136947 (Reinstate nnethercote in the review rotation.)
r? `@ghost`
`@rustbot` modify labels: rollup
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Reject `?Trait` bounds in various places where we unconditionally warned since 1.0
fixes #135730
fixes #135809
Also a breaking change, so let's see what crater says.
This has been an unconditional warning since *before* 1.0
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Stabilize target_feature_11
# Stabilization report
This is an updated version of https://github.com/rust-lang/rust/pull/116114, which is itself a redo of https://github.com/rust-lang/rust/pull/99767. Most of this commit and report were copied from those PRs. Thanks ```@LeSeulArtichaut``` and ```@calebzulawski!```
## Summary
Allows for safe functions to be marked with `#[target_feature]` attributes.
Functions marked with `#[target_feature]` are generally considered as unsafe functions: they are unsafe to call, cannot *generally* be assigned to safe function pointers, and don't implement the `Fn*` traits.
However, calling them from other `#[target_feature]` functions with a superset of features is safe.
```rust
// Demonstration function
#[target_feature(enable = "avx2")]
fn avx2() {}
fn foo() {
// Calling `avx2` here is unsafe, as we must ensure
// that AVX is available first.
unsafe {
avx2();
}
}
#[target_feature(enable = "avx2")]
fn bar() {
// Calling `avx2` here is safe.
avx2();
}
```
Moreover, once https://github.com/rust-lang/rust/pull/135504 is merged, they can be converted to safe function pointers in a context in which calling them is safe:
```rust
// Demonstration function
#[target_feature(enable = "avx2")]
fn avx2() {}
fn foo() -> fn() {
// Converting `avx2` to fn() is a compilation error here.
avx2
}
#[target_feature(enable = "avx2")]
fn bar() -> fn() {
// `avx2` coerces to fn() here
avx2
}
```
See the section "Closures" below for justification of this behaviour.
## Test cases
Tests for this feature can be found in [`tests/ui/target_feature/`](https://github.com/rust-lang/rust/tree/f6cb952dc115fd1311b02b694933e31d8dc8b002/tests/ui/target-feature).
## Edge cases
### Closures
* [target-feature 1.1: should closures inherit target-feature annotations? #73631](https://github.com/rust-lang/rust/issues/73631)
Closures defined inside functions marked with #[target_feature] inherit the target features of their parent function. They can still be assigned to safe function pointers and implement the appropriate `Fn*` traits.
```rust
#[target_feature(enable = "avx2")]
fn qux() {
let my_closure = || avx2(); // this call to `avx2` is safe
let f: fn() = my_closure;
}
```
This means that in order to call a function with #[target_feature], you must guarantee that the target-feature is available while the function, any closures defined inside it, as well as any safe function pointers obtained from target-feature functions inside it, execute.
This is usually ensured because target features are assumed to never disappear, and:
- on any unsafe call to a `#[target_feature]` function, presence of the target feature is guaranteed by the programmer through the safety requirements of the unsafe call.
- on any safe call, this is guaranteed recursively by the caller.
If you work in an environment where target features can be disabled, it is your responsibility to ensure that no code inside a target feature function (including inside a closure) runs after this (until the feature is enabled again).
**Note:** this has an effect on existing code, as nowadays closures do not inherit features from the enclosing function, and thus this strengthens a safety requirement. It was originally proposed in #73631 to solve this by adding a new type of UB: “taking a target feature away from your process after having run code that uses that target feature is UB” .
This was motivated by userspace code already assuming in a few places that CPU features never disappear from a program during execution (see i.e. https://github.com/rust-lang/stdarch/blob/2e29bdf90832931ea499755bb4ad7a6b0809295a/crates/std_detect/src/detect/arch/x86.rs); however, concerns were raised in the context of the Linux kernel; thus, we propose to relax that requirement to "causing the set of usable features to be reduced is unsafe; when doing so, the programmer is required to ensure that no closures or safe fn pointers that use removed features are still in scope".
* [Fix #[inline(always)] on closures with target feature 1.1 #111836](https://github.com/rust-lang/rust/pull/111836)
Closures accept `#[inline(always)]`, even within functions marked with `#[target_feature]`. Since these attributes conflict, `#[inline(always)]` wins out to maintain compatibility.
### ABI concerns
* [The extern "C" ABI of SIMD vector types depends on target features #116558](https://github.com/rust-lang/rust/issues/116558)
The ABI of some types can change when compiling a function with different target features. This could have introduced unsoundness with target_feature_11, but recent fixes (#133102, #132173) either make those situations invalid or make the ABI no longer dependent on features. Thus, those issues should no longer occur.
### Special functions
The `#[target_feature]` attribute is forbidden from a variety of special functions, such as main, current and future lang items (e.g. `#[start]`, `#[panic_handler]`), safe default trait implementations and safe trait methods.
This was not disallowed at the time of the first stabilization PR for target_features_11, and resulted in the following issues/PRs:
* [`#[target_feature]` is allowed on `main` #108645](https://github.com/rust-lang/rust/issues/108645)
* [`#[target_feature]` is allowed on default implementations #108646](https://github.com/rust-lang/rust/issues/108646)
* [#[target_feature] is allowed on #[panic_handler] with target_feature 1.1 #109411](https://github.com/rust-lang/rust/issues/109411)
* [Prevent using `#[target_feature]` on lang item functions #115910](https://github.com/rust-lang/rust/pull/115910)
## Documentation
* Reference: [Document the `target_feature_11` feature reference#1181](https://github.com/rust-lang/reference/pull/1181)
---
cc tracking issue https://github.com/rust-lang/rust/issues/69098
cc ```@workingjubilee```
cc ```@RalfJung```
r? ```@rust-lang/lang```
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Rename rustc_middle::Ty::is_unsafe_ptr to is_raw_ptr
The wording unsafe pointer is less common and not mentioned in a lot of places, instead this is usually called a "raw pointer". For the sake of uniformity, we rename this method.
This came up during the review of
https://github.com/rust-lang/rust/pull/134424.
r? `@Noratrieb`
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workingjubilee:stabilize-externabi-hashing-forever, r=compiler-errors
compiler: give `ExternAbi` truly stable `Hash` and `Ord`
Currently, `ExternAbi` has a bunch of code to handle the reality that, as an enum, adding more variants to it will risk it hashing differently. It forces all of those variants to be added in a fixed order, except this means that the order of the variants doesn't correspond to any logical order except "historical accident". This is all to avoid having to rebless two tests. Perhaps there were more, once upon a time? But then we invented normalization in our test suite to handle exactly this sort of issue in a more general way.
There are two options here:
- Get rid of all the logical overhead and shrug, embracing blessing a couple of tests sometimes
- Change `ExternAbi` to have an ordering and hash that doesn't depend on the number of variants
As `ExternAbi` is essentially a strongly-typed string, and thus no two strings can be identical, this implements the second of the two by hand-implementing `Ord` and `Hash` to make the hashing and comparison based on the string! This will diff the current hashes, but they will diff no more after this.
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Check whole `Unsize` predicate for escaping bound vars
Fixes #136799
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clarify and document needs-dynamic-linking
try-job: test-various
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Rollup of 8 pull requests
Successful merges:
- #134981 ( Explain that in paths generics can't be set on both the enum and the variant)
- #136698 (Replace i686-unknown-redox target with i586-unknown-redox)
- #136767 (improve host/cross target checking)
- #136829 ([rustdoc] Move line numbers into the `<code>` directly)
- #136875 (Rustc dev guide subtree update)
- #136900 (compiler: replace `ExternAbi::name` calls with formatters)
- #136913 (Put kobzol back on review rotation)
- #136915 (documentation fix: `f16` and `f128` are not double-precision)
r? `@ghost`
`@rustbot` modify labels: rollup
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compiler: replace `ExternAbi::name` calls with formatters
Most of these just format the ABI string, so... just format ExternAbi? This makes it more consistent and less jank when we can do it.
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