Rollup of 9 pull requests
Successful merges:
- #87561 (thread set_name haiku implementation.)
- #87715 (Add long error explanation for E0625)
- #87727 (explicit_generic_args_with_impl_trait: fix min expected number of generics)
- #87742 (Validate FFI-safety warnings on naked functions)
- #87756 (Add back -Zno-profiler-runtime)
- #87759 (Re-use std::sealed::Sealed in os/linux/process.)
- #87760 (Promote `aarch64-apple-ios-sim` to Tier 2)
- #87770 (permit drop impls with generic constants in where clauses)
- #87780 (alloc: Use intra doc links for the reserve function)
Failed merges:
r? `@ghost`
`@rustbot` modify labels: rollup
permit drop impls with generic constants in where clauses
Fixes#79248
`==` is not sufficient to check for equality between unevaluated consts which causes the above issue because the const in `[(); N - 1]:` on the impl and the const in `[(); N - 1]:` on the struct def are not seen as equal. Any predicate that can contain an unevaluated const cant use `==` here as it will cause us to incorrectly emit an error.
I dont know much about chalk but it seems like we ought to be relating the `TypeWellFormedFromEnv` instead of `==` as it contains a `Ty` so I added that too...
r? ``````@lcnr``````
Add back -Zno-profiler-runtime
This was removed by #85284 in favor of `-Zprofiler-runtime=<name>`.However the suggested `-Zprofiler-runtime=None` doesn't work because`None` is treated as a crate name.
explicit_generic_args_with_impl_trait: fix min expected number of generics
Fixes#87718
The problem was that `synth_type_param_count` was already subtracted from `named_type_param_count`, so this ended up being subtracted again. This caused `expected_min` to overflow, and ultimately resulting in weird and wrong behaviour.
I've also added another test not present in the original issue but caused by the same bug.
The indexes into the VaListImpl struct used on aarch64 ABI (not macos/ios) are hard-coded which is brittle so we replace them with the usual lookup.
The varargs ffi is tested in ui/abi/variadic-ffi.rs on aarch64 Linux.
Rather than relying on `getPointerElementType()` from LLVM function
pointers, we now pass the function type explicitly when building `call`
or `invoke` instructions.
Disable unused variable lint for naked functions
In most calling conventions, accessing function parameters may require
stack access. However, naked functions have no assembly prelude to set
up stack access. This is why naked functions may only contain a single
`asm!()` block. All parameter access is done inside the `asm!()` block,
so we cannot validate the liveness of the input parameters. Therefore,
we should disable the lint for naked functions.
rust-lang/rfcs#2774rust-lang/rfcs#2972
`@joshtriplett` `@Amanieu` `@haraldh`
Allow more "unknown argument" strings from linker
Some toolchains emit slightly different errors, e.g.
ppc-vle-gcc: error: unrecognized option '-no-pie'
emit_aapcs_va_arg() emits hardcoded field indexes to access the
aarch64-specific `VaListImpl` struct. Due to the removed padding
those indexes have changed.
LLVM codegen: Don't emit zero-sized padding for whiles because that has no use and makes it impossible to generate the return types that LLVM expects for certain ARM SIMD intrinsics.
rustc: Fill out remaining parts of C-unwind ABI
This commit intends to fill out some of the remaining pieces of the
C-unwind ABI. This has a number of other changes with it though to move
this design space forward a bit. Notably contained within here is:
* On `panic=unwind`, the `extern "C"` ABI is now considered as "may
unwind". This fixes a longstanding soundness issue where if you
`panic!()` in an `extern "C"` function defined in Rust that's actually
UB because the LLVM representation for the function has the `nounwind`
attribute, but then you unwind.
* Whether or not a function unwinds now mainly considers the ABI of the
function instead of first checking the panic strategy. This fixes a
miscompile of `extern "C-unwind"` with `panic=abort` because that ABI
can still unwind.
* The aborting stub for non-unwinding ABIs with `panic=unwind` has been
reimplemented. Previously this was done as a small tweak during MIR
generation, but this has been moved to a separate and dedicated MIR
pass. This new pass will, for appropriate functions and function
calls, insert a `cleanup` landing pad for any function call that may
unwind within a function that is itself not allowed to unwind. Note
that this subtly changes some behavior from before where previously on
an unwind which was caught-to-abort it would run active destructors in
the function, and now it simply immediately aborts the process.
* The `#[unwind]` attribute has been removed and all users in tests and
such are now using `C-unwind` and `#![feature(c_unwind)]`.
I think this is largely the last piece of the RFC to implement.
Unfortunately I believe this is still not stabilizable as-is because
activating the feature gate changes the behavior of the existing `extern
"C"` ABI in a way that has no replacement. My thinking for how to enable
this is that we add support for the `C-unwind` ABI on stable Rust first,
and then after it hits stable we change the behavior of the `C` ABI.
That way anyone straddling stable/beta/nightly can switch to `C-unwind`
safely.
In most calling conventions, accessing function parameters may require
stack access. However, naked functions have no assembly prelude to set
up stack access. This is why naked functions may only contain a single
`asm!()` block. All parameter access is done inside the `asm!()` block,
so we cannot validate the liveness of the input parameters. Therefore,
we should disable the lint for naked functions.
rust-lang/rfcs#2774rust-lang/rfcs#2972
This check was previously categorized under the lint named
`UNSUPPORTED_NAKED_FUNCTIONS`. That lint is future incompatible and will
be turned into an error in a future release. However, as defined in the
Constrained Naked Functions RFC, this check should only be a warning.
This is because it is possible for a naked function to be implemented in
such a way that it does not break even the undefined ABI. For example, a
`jmp` to a `const`.
Therefore, this patch defines a new lint named
`UNDEFINED_NAKED_FUNCTION_ABI` which contains just this single check.
Unlike `UNSUPPORTED_NAKED_FUNCTIONS`, `UNDEFINED_NAKED_FUNCTION_ABI`
will not be converted to an error in the future.
rust-lang/rfcs#2774rust-lang/rfcs#2972
Remove unnecessary trailing whitespace from error messages
Some error messages currently contain unnecessary trailing whitespace. There are some legitimate reasons for having trailing whitespace in the output, such as for uniform indentation of possibly-empty input lines, but the whitespace I have addressed here occurs in a line used only for spacing, and I see no reason why that should have trailing whitespace (spacing lines inserted in other places also don't have trailing whitespace).
I have also removed a superfluous call to `buffer.putc()`, which has no effect because the same character is already placed there by `draw_col_separator()`.
Use `git diff --ignore-space-at-eol` to see my changes; otherwise the diff is quite large due to the whitespace removed from expected outputs in `src/test/ui/`.
This was removed by #85284 in favor of -Zprofiler-runtime=<name>.
However the suggested -Zprofiler-runtime=None doesn't work because
"None" is treated as a crate name.
Allow labeled loops as value expressions for `break`
Fixes#86948. This is currently allowed:
```rust
return 'label: loop { break 'label 42; };
break ('label: loop { break 'label 42; });
break 1 + 'label: loop { break 'label 42; };
break 'outer 'inner: loop { break 'inner 42; };
```
But not this:
```rust
break 'label: loop { break 'label 42; };
```
I have fixed this, so that the above now parses as an unlabeled break with a labeled loop as its value expression.
rustc: Replace `HirId`s with `LocalDefId`s in `AccessLevels` tables
and passes using those tables - primarily privacy checking, stability checking and dead code checking.
All these passes work with definitions rather than with arbitrary HIR nodes.
r? `@cjgillot`
cc `@lambinoo` (#87487)
Remove the aarch64 `crypto` target_feature
The subfeatures `aes` or `sha2` should be used instead.
This can't yet be done for ARM targets as some LLVM intrinsics still require `crypto`.
Also update the runtime feature detection tests in `library/std` to mirror the updates in `stdarch`. This also helps https://github.com/rust-lang/rust/issues/86941
r? ``@Amanieu``
Remove space after negative sign in Literal to_string
Negative proc macro literal tokens used to be printed with a space between the minus sign and the magnitude. That's because `impl ToString for Literal` used to convert the Literal into a TokenStream, which splits the minus sign into a separate Punct token.
```rust
Literal::isize_unsuffixed(-10).to_string() // "- 10"
```
This PR updates the ToString impl to directly use `rustc_ast::token::Lit`'s ToString, which matches the way Rust negative numbers are idiomatically written without a space.
```rust
Literal::isize_unsuffixed(-10).to_string() // "-10"
```
Places are usually shallow and quick to visit. By contrast, computing
`is_freeze` can be much costlier, involving inference and trait
solving. Making sure to call `is_freeze` only when necessary should be
beneficial for performance in most cases.
Remove invalid suggestion involving `Fn` trait bound
This pull request closes#85735. The actual issue is a duplicate of #21974, but #85735 contains a further problem, which is an invalid suggestion if `Fn`/`FnMut`/`FnOnce` trait bounds are involved: The suggestion code checks whether the trait bound ends with `>` to determine whether it has any generic arguments, but the `Fn*` traits have a special syntax for generic arguments that doesn't involve angle brackets. The example given in #85735:
```rust
trait Foo {}
impl<'a, 'b, T> Foo for T
where
T: FnMut(&'a ()),
T: FnMut(&'b ()), {
}
```
currently produces:
```
error[E0283]: type annotations needed
--> src/lib.rs:4:8
|
4 | T: FnMut(&'a ()),
| ^^^^^^^^^^^^^ cannot infer type for type parameter `T`
|
= note: cannot satisfy `T: FnMut<(&'a (),)>`
help: consider specifying the type arguments in the function call
|
4 | T: FnMut(&'a ())::<Self, Args>,
| ^^^^^^^^^^^^^^
error: aborting due to previous error
```
which is incorrect, because there is no function call, and applying the suggestion would lead to a parse error. With my changes, I get:
```
error[E0283]: type annotations needed
--> test.rs:4:8
|
4 | T: FnMut(&'a ()),
| ^^^^^^^^^^^^^ cannot infer type for type parameter `T`
|
::: [...]/library/core/src/ops/function.rs:147:1
|
147 | pub trait FnMut<Args>: FnOnce<Args> {
| ----------------------------------- required by this bound in `FnMut`
|
= note: cannot satisfy `T: FnMut<(&'a (),)>`
error: aborting due to previous error
```
i.e. I have added a check to prevent the invalid suggestion from being issued for `Fn*` bounds, while the underlying issue #21974 remains for now.
