Unfortunately, the diagnostic lints are very broken and trigger much
more often than they should. Correct the conditional which checks if the
function call being made is to a diagnostic function so that it returns
in every intended case.

Signed-off-by: David Wood <[email protected]>

The `rustc_lint_diagnostics` attribute is used by the diagnostic
translation/struct migration lints to identify calls where
non-translatable diagnostics or diagnostics outwith impls are being
created. Any function used in creating a diagnostic should be annotated
with this attribute so this commit adds the attribute to many more
functions.

Signed-off-by: David Wood <[email protected]>

Signed-off-by: David Wood <[email protected]>

Signed-off-by: David Wood <[email protected]>

Signed-off-by: David Wood <[email protected]>

Signed-off-by: David Wood <[email protected]>

Signed-off-by: David Wood <[email protected]>

Just like `Box<T>`, `ThinBox<T>` owns its data on the heap, so it should
implement `Send` and `Sync` when `T` does.

(Discovered in rust-lang#98571 (comment))

The change to move CStr/CString to core/alloc is currently behind feature flags as stated in rust-lang#98314

Fix FFI-unwind unsoundness with mixed panic mode

UB maybe introduced when an FFI exception happens in a `C-unwind` foreign function and it propagates through a crate compiled with `-C panic=unwind` into a crate compiled with `-C panic=abort` (rust-lang#96926).

To prevent this unsoundness from happening, we will disallow a crate compiled with `-C panic=unwind` to be linked into `panic-abort` *if* it contains a call to `C-unwind` foreign function or function pointer. If no such call exists, then we continue to allow such mixed panic mode linking because it's sound (and stable). In fact we still need the ability to do mixed panic mode linking for std, because we only compile std once with `-C panic=unwind` and link it regardless panic strategy.

For libraries that wish to remain compile-once-and-linkable-to-both-panic-runtimes, a `ffi_unwind_calls` lint is added (gated under `c_unwind` feature gate) to flag any FFI unwind calls that will cause the linkable panic runtime be restricted.

In summary:
```rust
#![warn(ffi_unwind_calls)]

mod foo {
    #[no_mangle]
    pub extern "C-unwind" fn foo() {}
}

extern "C-unwind" {
    fn foo();
}

fn main() {
    // Call to Rust function is fine regardless ABI.
    foo::foo();
    // Call to foreign function, will cause the crate to be unlinkable to panic-abort if compiled with `-Cpanic=unwind`.
    unsafe { foo(); }
    //~^ WARNING call to foreign function with FFI-unwind ABI
    let ptr: extern "C-unwind" fn() = foo::foo;
    // Call to function pointer, will cause the crate to be unlinkable to panic-abort if compiled with `-Cpanic=unwind`.
    ptr();
    //~^ WARNING call to function pointer with FFI-unwind ABI
}
```

Fix rust-lang#96926

`@rustbot` label: T-compiler F-c_unwind

… r=oli-obk

Remove a back-compat hack on lazy TAIT

This PR's motivation is here: rust-lang#72614 (comment)
~~But removing a hack doesn't seem to reject the code on the issue, there're some more hacks?~~
r? `@oli-obk`

…suggestion_highlight_lines, r=flip1995

Remove `MAX_SUGGESTION_HIGHLIGHT_LINES`

After rust-lang#97798 the `MAX_SUGGESTION_HIGHLIGHT_LINES` constant doesn't really make sense since we always show full suggestions. This PR removes last usages of the constant and the constant itself.

r? `@flip1995` (this mostly does changes in clippy)

[RFC 2011] Optimize non-consuming operators

Tracking issue: rust-lang#44838
Fifth step of rust-lang#96496

The most non-invasive approach that will probably have very little to no performance impact.

## Current behaviour

Captures are handled "on-the-fly", i.e., they are performed in the same place expressions are located.

```rust
// `let a = 1; let b = 2; assert!(a > 1 && b < 100);`

if !(
  { ***try capture `a` and then return `a`*** } > 1 && { ***try capture `b` and then return `b`*** } < 100
) {
  panic!( ... );
}
```

As such, some overhead is likely to occur (Specially with very large chains of conditions).

## New behaviour for non-consuming operators

When an operator is known to not take `self`, then it is possible to capture variables **AFTER** the condition.

```rust
// `let a = 1; let b = 2; assert!(a > 1 && b < 100);`

if !( a > 1 && b < 100 ) {
  { ***try capture `a`*** }
  { ***try capture `b`*** }
  panic!( ... );
}
```

So the possible impact on the runtime execution time will be diminished.

r? ```@oli-obk```

…r=davidtwco,michaelwoerister

Fix RSS reporting on macOS

> NOTE: This is a duplicate of rust-lang#98164, which I closed because I borked my rustc fork

Currently, `rustc_data_structures::profiling::get_resident_set_size()` always returns `None` on macOS. This is because
macOS does not implement procfs used in the unix version of the function:

```rust
...
else if #[cfg(unix)] {
        pub fn get_resident_set_size() -> Option<usize> {
            let field = 1;
            let contents = fs::read("/proc/self/statm").ok()?;
            let contents = String::from_utf8(contents).ok()?;
            let s = contents.split_whitespace().nth(field)?;
            let npages = s.parse::<usize>().ok()?;
            Some(npages * 4096)
        }
...
```

The proposed solution uses libproc, and more specifically `proc_pidinfo`, which has been available on macOS since 10.5 if the function signature inside libproc.h is to be believed:

```c
int proc_pidinfo(int pid, int flavor, uint64_t arg, void *buffer, int buffersize) __OSX_AVAILABLE_STARTING(__MAC_10_5, __IPHONE_2_0);
```

…d-more-migration, r=compiler-errors

translation: lint fix + more migration

- Unfortunately, the diagnostic lints are very broken and trigger much more often than they should. This PR corrects the conditional which checks if the function call being made is to a diagnostic function so that it returns in every intended case.
- The `rustc_lint_diagnostics` attribute is used by the diagnostic translation/struct migration lints to identify calls where non-translatable diagnostics or diagnostics outwith impls are being created. Any function used in creating a diagnostic should be annotated with this attribute so this PR adds the attribute to many more functions.
- Port the diagnostics from the `rustc_privacy` crate and enable the lints for that crate.

r? `@compiler-errors`

Hermit: Fix initializing lazy locks

Closes hermit-os/hermit-rs#322.

The initialization function of hermit's `Condvar` is not called since rust-lang#97647 and was erroneously removed in rust-lang#97879.

r? `@m-ou-se`

CC: `@stlankes`

Implement `Send` and `Sync` for `ThinBox<T>`

Just like `Box<T>`, `ThinBox<T>` owns its data on the heap, so it should
implement `Send` and `Sync` when `T` does.

This extends tracking issue rust-lang#92791.

Remove unstable CStr/CString change from 1.62 release note

(Discovered in rust-lang#98571 (comment))

The change to move CStr/CString to core/alloc is currently behind feature flags as stated in rust-lang#98314