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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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Explain that in paths generics can't be set on both the enum and the variant
```
error[E0109]: type arguments are not allowed on tuple variant `TSVariant`
--> $DIR/enum-variant-generic-args.rs:54:29
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LL | Enum::<()>::TSVariant::<()>(());
| --------- ^^ type argument not allowed
| |
| not allowed on tuple variant `TSVariant`
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= note: generic arguments are not allowed on both an enum and its variant's path segments simultaneously; they are only valid in one place or the other
help: remove the generics arguments from one of the path segments
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LL - Enum::<()>::TSVariant::<()>(());
LL + Enum::TSVariant::<()>(());
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LL - Enum::<()>::TSVariant::<()>(());
LL + Enum::<()>::TSVariant(());
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```
Fix #93993.
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Revert "Stabilize `extended_varargs_abi_support`"
I cannot find an FCP for this, despite it being a stabilization PR which normally means we do an FCP of some kind? It would seem reasonable for _either_ compiler or lang to have FCPed it? I am thus opening a revert PR, which mostly-cleanly applies, so that we can later actually land this properly with a stability report and FCP.
- https://github.com/rust-lang/rust/issues/136896
- https://github.com/rust-lang/rust/pull/116161
- https://github.com/rust-lang/rust/issues/100189
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Rollup of 8 pull requests
Successful merges:
- #135549 (Document some safety constraints and use more safe wrappers)
- #135965 (In "specify type" suggestion, skip type params that are already known)
- #136193 (Implement pattern type ffi checks)
- #136646 (Add a TyPat in the AST to reuse the generic arg lowering logic)
- #136874 (Change the issue number for `likely_unlikely` and `cold_path`)
- #136884 (Lower fn items as ZST valtrees and delay a bug)
- #136885 (i686-linux-android: increase CPU baseline to Pentium 4 (without an actual change)
- #136891 (Check sig for errors before checking for unconstrained anonymous lifetime)
r? `@ghost`
`@rustbot` modify labels: rollup
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Check sig for errors before checking for unconstrained anonymous lifetime
Fixes #136841
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Lower fn items as ZST valtrees and delay a bug
Lower it as a ZST instead of a const error, which we can handle mostly fine. Delay a bug so we don't accidentally support it tho.
r? BoxyUwU
Fixes #136855
Fixes #136853
Fixes #136854
Fixes #136337
Only added one test bc that's really the crux of the issue (fn item in array length position).
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Add a TyPat in the AST to reuse the generic arg lowering logic
This simplifies ast lowering significantly with little cost to the pattern types parser.
Also fixes any problems we've had with generic args (well, pushes any problems onto the `generic_const_exprs` feature gate)
follow-up to https://github.com/rust-lang/rust/pull/136284#discussion_r1939292367
r? ``@BoxyUwU``
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Implement pattern type ffi checks
Previously we just rejected pattern types outright in FFI, but that was never meant to be a permanent situation. We'll need them supported to use them as the building block for `NonZero` and `NonNull` after all (both of which are FFI safe).
best reviewed commit by commit.
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In "specify type" suggestion, skip type params that are already known
When we suggest specifying a type for an expression or pattern, like in a `let` binding, we previously would print the entire type as the type system knew it. We now look at the params that have *no* inference variables, so they are fully known to the type system which means that they don't need to be specified.
This helps in suggestions for types that are really long, because we can usually skip most of the type params and make the annotation as short as possible:
```
error[E0282]: type annotations needed for `Result<_, ((..., ..., ..., ...), ..., ..., ...)>`
--> $DIR/really-long-type-in-let-binding-without-sufficient-type-info.rs:7:9
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LL | let y = Err(x);
| ^ ------ type must be known at this point
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help: consider giving `y` an explicit type, where the type for type parameter `T` is specified
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LL | let y: Result<T, _> = Err(x);
| ++++++++++++++
```
Fix #135919.
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Directly map each ExternAbi variant to its string and back again.
This has a few advantages:
- By making the ABIs compare equal to their strings, we can easily
lexicographically sort them and use that sorted slice at runtime.
- We no longer need a workaround to make sure the hashes remain stable,
as they already naturally are (by being the hashes of unique strings).
- The compiler can carry around less &str wide pointers
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Properly deeply normalize in the next solver
Turn deep normalization into a `TypeOp`. In the old solver, just dispatch to the `Normalize` type op, but in the new solver call `deeply_normalize`. I chose to separate it into a different type op b/c some normalization is a no-op in the new solver, so this distinguishes just the normalization we need for correctness.
Then use `DeeplyNormalize` in the callsites we used to be using a `CustomTypeOp` (for normalizing known type outlives obligations), and also use it to normalize function args and impl headers in the new solver.
Finally, use it to normalize signatures for WF checks in the new solver as well. This addresses https://github.com/rust-lang/trait-system-refactor-initiative/issues/146.
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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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Also, use signular form for consistency/simplicity
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This reverts commit 685f189b4307435b83d625fea397ef36dff4e955.
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```
error[E0109]: type arguments are not allowed on tuple variant `TSVariant`
--> $DIR/enum-variant-generic-args.rs:54:29
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LL | Enum::<()>::TSVariant::<()>(());
| --------- ^^ type argument not allowed
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| not allowed on tuple variant `TSVariant`
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= note: generic arguments are not allowed on both an enum and its variant's path segments simultaneously; they are only valid in one place or the other
help: remove the generics arguments from one of the path segments
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LL - Enum::<()>::TSVariant::<()>(());
LL + Enum::<()>::TSVariant(());
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```
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```
error[E0109]: type arguments are not allowed on enum `Enum` and tuple variant `TSVariant`
--> $DIR/enum-variant-generic-args.rs:54:12
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LL | Enum::<()>::TSVariant::<()>(());
| ---- ^^ --------- ^^ type argument not allowed
| | |
| | not allowed on tuple variant `TSVariant`
| not allowed on enum `Enum`
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= note: generic arguments are not allowed on both an enum and its variant's path segments simultaneously; they are only valid in one place or the other
help: remove the generics arguments from one of the path segments
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LL - Enum::<()>::TSVariant::<()>(());
LL + Enum::<()>::TSVariant(());
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```
Fix #93993.
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r=SparrowLii,jieyouxu
show supported register classes in error message
a simple diagnostic change that shows the supported register classes when an invalid one is found.
This information can be hard to find (especially for unstable targets), and this message now gives at least something to try or search for. I've followed the pattern for invalid clobber ABIs.
`@rustbot` label +A-inline-assembly
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Rollup of 11 pull requests
Successful merges:
- #136606 (Fix long lines which rustfmt fails to format)
- #136663 (Stabilize `NonZero::count_ones`)
- #136672 (library: doc: core::alloc::Allocator: trivial typo fix)
- #136704 (Improve examples for file locking)
- #136721 (cg_llvm: Reduce visibility of some items outside the `llvm` module)
- #136813 (rustc_target: Add the fp16 target feature for AArch32)
- #136830 (fix i686-unknown-hurd-gnu x87 footnote)
- #136832 (Fix platform support table for i686-unknown-uefi)
- #136835 (Stop using span hack for contracts feature gating)
- #136837 (Overhaul how contracts are lowered on fn-like bodies)
- #136839 (fix ensure_monomorphic_enough)
r? `@ghost`
`@rustbot` modify labels: rollup
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since 1.0
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Overhaul how contracts are lowered on fn-like bodies
Consolidates all of the contracts lowering logic into `lower_fn_body`, rather than having it be split between `lower_item_kind` and `lower_fn_body`. This should fix #136683.
r? celinval
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