Auto merge of #130865 - cuviper:library-raw_ref_op, r=tgross35

Use `&raw` in the standard library

Since the stabilization in #127679 has reached stage0, 1.82-beta, we can
start using `&raw` freely, and even the soft-deprecated `ptr::addr_of!`
and `ptr::addr_of_mut!` can stop allowing the unstable feature.

I intentionally did not change any documentation or tests, but the rest
of those macro uses are all now using `&raw const` or `&raw mut` in the
standard library.

Author: bors

library/alloc/src/boxed.rs

@@ -199,7 +199,7 @@ use core::ops::{
     DerefPure, DispatchFromDyn, Receiver,
 };
 use core::pin::{Pin, PinCoerceUnsized};
-use core::ptr::{self, NonNull, Unique, addr_of_mut};
+use core::ptr::{self, NonNull, Unique};
 use core::task::{Context, Poll};
 use core::{borrow, fmt, slice};
 
@@ -1277,7 +1277,7 @@ impl<T: ?Sized, A: Allocator> Box<T, A> {
     #[inline]
     pub fn into_raw(b: Self) -> *mut T {
         // Make sure Miri realizes that we transition from a noalias pointer to a raw pointer here.
-        unsafe { addr_of_mut!(*&mut *Self::into_raw_with_allocator(b).0) }
+        unsafe { &raw mut *&mut *Self::into_raw_with_allocator(b).0 }
     }
 
     /// Consumes the `Box`, returning a wrapped `NonNull` pointer.
@@ -1396,7 +1396,7 @@ impl<T: ?Sized, A: Allocator> Box<T, A> {
         // want *no* aliasing requirements here!
         // In case `A` *is* `Global`, this does not quite have the right behavior; `into_raw`
         // works around that.
-        let ptr = addr_of_mut!(**b);
+        let ptr = &raw mut **b;
         let alloc = unsafe { ptr::read(&b.1) };
         (ptr, alloc)
     }
@@ -1506,7 +1506,7 @@ impl<T: ?Sized, A: Allocator> Box<T, A> {
     pub fn as_mut_ptr(b: &mut Self) -> *mut T {
         // This is a primitive deref, not going through `DerefMut`, and therefore not materializing
         // any references.
-        ptr::addr_of_mut!(**b)
+        &raw mut **b
     }
 
     /// Returns a raw pointer to the `Box`'s contents.
@@ -1554,7 +1554,7 @@ impl<T: ?Sized, A: Allocator> Box<T, A> {
     pub fn as_ptr(b: &Self) -> *const T {
         // This is a primitive deref, not going through `DerefMut`, and therefore not materializing
         // any references.
-        ptr::addr_of!(**b)
+        &raw const **b
     }
 
     /// Returns a reference to the underlying allocator.

library/alloc/src/boxed/thin.rs

@@ -186,7 +186,7 @@ impl<T: ?Sized> ThinBox<T> {
 
     fn with_header(&self) -> &WithHeader<<T as Pointee>::Metadata> {
         // SAFETY: both types are transparent to `NonNull<u8>`
-        unsafe { &*(core::ptr::addr_of!(self.ptr) as *const WithHeader<_>) }
+        unsafe { &*((&raw const self.ptr) as *const WithHeader<_>) }
     }
 }
 

library/alloc/src/collections/btree/node.rs

@@ -72,8 +72,8 @@ impl<K, V> LeafNode<K, V> {
         // be both slightly faster and easier to track in Valgrind.
         unsafe {
             // parent_idx, keys, and vals are all MaybeUninit
-            ptr::addr_of_mut!((*this).parent).write(None);
-            ptr::addr_of_mut!((*this).len).write(0);
+            (&raw mut (*this).parent).write(None);
+            (&raw mut (*this).len).write(0);
         }
     }
 
@@ -114,7 +114,7 @@ impl<K, V> InternalNode<K, V> {
         unsafe {
             let mut node = Box::<Self, _>::new_uninit_in(alloc);
             // We only need to initialize the data; the edges are MaybeUninit.
-            LeafNode::init(ptr::addr_of_mut!((*node.as_mut_ptr()).data));
+            LeafNode::init(&raw mut (*node.as_mut_ptr()).data);
             node.assume_init()
         }
     }
@@ -525,8 +525,8 @@ impl<'a, K, V, Type> NodeRef<marker::ValMut<'a>, K, V, Type> {
         // to avoid aliasing with outstanding references to other elements,
         // in particular, those returned to the caller in earlier iterations.
         let leaf = Self::as_leaf_ptr(&mut self);
-        let keys = unsafe { ptr::addr_of!((*leaf).keys) };
-        let vals = unsafe { ptr::addr_of_mut!((*leaf).vals) };
+        let keys = unsafe { &raw const (*leaf).keys };
+        let vals = unsafe { &raw mut (*leaf).vals };
         // We must coerce to unsized array pointers because of Rust issue #74679.
         let keys: *const [_] = keys;
         let vals: *mut [_] = vals;

library/alloc/src/rc.rs

@@ -787,7 +787,7 @@ impl<T, A: Allocator> Rc<T, A> {
 
         let strong = unsafe {
             let inner = init_ptr.as_ptr();
-            ptr::write(ptr::addr_of_mut!((*inner).value), data);
+            ptr::write(&raw mut (*inner).value, data);
 
             let prev_value = (*inner).strong.get();
             debug_assert_eq!(prev_value, 0, "No prior strong references should exist");
@@ -1442,7 +1442,7 @@ impl<T: ?Sized, A: Allocator> Rc<T, A> {
         // SAFETY: This cannot go through Deref::deref or Rc::inner because
         // this is required to retain raw/mut provenance such that e.g. `get_mut` can
         // write through the pointer after the Rc is recovered through `from_raw`.
-        unsafe { ptr::addr_of_mut!((*ptr).value) }
+        unsafe { &raw mut (*ptr).value }
     }
 
     /// Constructs an `Rc<T, A>` from a raw pointer in the provided allocator.
@@ -2042,8 +2042,8 @@ impl<T: ?Sized> Rc<T> {
         unsafe {
             debug_assert_eq!(Layout::for_value_raw(inner), layout);
 
-            ptr::addr_of_mut!((*inner).strong).write(Cell::new(1));
-            ptr::addr_of_mut!((*inner).weak).write(Cell::new(1));
+            (&raw mut (*inner).strong).write(Cell::new(1));
+            (&raw mut (*inner).weak).write(Cell::new(1));
         }
 
         Ok(inner)
@@ -2072,8 +2072,8 @@ impl<T: ?Sized, A: Allocator> Rc<T, A> {
 
             // Copy value as bytes
             ptr::copy_nonoverlapping(
-                core::ptr::addr_of!(*src) as *const u8,
-                ptr::addr_of_mut!((*ptr).value) as *mut u8,
+                (&raw const *src) as *const u8,
+                (&raw mut (*ptr).value) as *mut u8,
                 value_size,
             );
 
@@ -2107,11 +2107,7 @@ impl<T> Rc<[T]> {
     unsafe fn copy_from_slice(v: &[T]) -> Rc<[T]> {
         unsafe {
             let ptr = Self::allocate_for_slice(v.len());
-            ptr::copy_nonoverlapping(
-                v.as_ptr(),
-                ptr::addr_of_mut!((*ptr).value) as *mut T,
-                v.len(),
-            );
+            ptr::copy_nonoverlapping(v.as_ptr(), (&raw mut (*ptr).value) as *mut T, v.len());
             Self::from_ptr(ptr)
         }
     }
@@ -2149,7 +2145,7 @@ impl<T> Rc<[T]> {
             let layout = Layout::for_value_raw(ptr);
 
             // Pointer to first element
-            let elems = ptr::addr_of_mut!((*ptr).value) as *mut T;
+            let elems = (&raw mut (*ptr).value) as *mut T;
 
             let mut guard = Guard { mem: NonNull::new_unchecked(mem), elems, layout, n_elems: 0 };
 
@@ -2577,7 +2573,7 @@ impl<T: ?Sized + fmt::Debug, A: Allocator> fmt::Debug for Rc<T, A> {
 #[stable(feature = "rust1", since = "1.0.0")]
 impl<T: ?Sized, A: Allocator> fmt::Pointer for Rc<T, A> {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        fmt::Pointer::fmt(&core::ptr::addr_of!(**self), f)
+        fmt::Pointer::fmt(&(&raw const **self), f)
     }
 }
 
@@ -2718,7 +2714,7 @@ impl<T, A: Allocator> From<Vec<T, A>> for Rc<[T], A> {
             let (vec_ptr, len, cap, alloc) = v.into_raw_parts_with_alloc();
 
             let rc_ptr = Self::allocate_for_slice_in(len, &alloc);
-            ptr::copy_nonoverlapping(vec_ptr, ptr::addr_of_mut!((*rc_ptr).value) as *mut T, len);
+            ptr::copy_nonoverlapping(vec_ptr, (&raw mut (*rc_ptr).value) as *mut T, len);
 
             // Create a `Vec<T, &A>` with length 0, to deallocate the buffer
             // without dropping its contents or the allocator
@@ -3084,7 +3080,7 @@ impl<T: ?Sized, A: Allocator> Weak<T, A> {
             // SAFETY: if is_dangling returns false, then the pointer is dereferenceable.
             // The payload may be dropped at this point, and we have to maintain provenance,
             // so use raw pointer manipulation.
-            unsafe { ptr::addr_of_mut!((*ptr).value) }
+            unsafe { &raw mut (*ptr).value }
         }
     }
 

library/alloc/src/sync.rs

@@ -797,7 +797,7 @@ impl<T, A: Allocator> Arc<T, A> {
         // reference into a strong reference.
         let strong = unsafe {
             let inner = init_ptr.as_ptr();
-            ptr::write(ptr::addr_of_mut!((*inner).data), data);
+            ptr::write(&raw mut (*inner).data, data);
 
             // The above write to the data field must be visible to any threads which
             // observe a non-zero strong count. Therefore we need at least "Release" ordering
@@ -1583,7 +1583,7 @@ impl<T: ?Sized, A: Allocator> Arc<T, A> {
         // SAFETY: This cannot go through Deref::deref or RcBoxPtr::inner because
         // this is required to retain raw/mut provenance such that e.g. `get_mut` can
         // write through the pointer after the Rc is recovered through `from_raw`.
-        unsafe { ptr::addr_of_mut!((*ptr).data) }
+        unsafe { &raw mut (*ptr).data }
     }
 
     /// Constructs an `Arc<T, A>` from a raw pointer.
@@ -1955,8 +1955,8 @@ impl<T: ?Sized> Arc<T> {
         debug_assert_eq!(unsafe { Layout::for_value_raw(inner) }, layout);
 
         unsafe {
-            ptr::addr_of_mut!((*inner).strong).write(atomic::AtomicUsize::new(1));
-            ptr::addr_of_mut!((*inner).weak).write(atomic::AtomicUsize::new(1));
+            (&raw mut (*inner).strong).write(atomic::AtomicUsize::new(1));
+            (&raw mut (*inner).weak).write(atomic::AtomicUsize::new(1));
         }
 
         inner
@@ -1986,8 +1986,8 @@ impl<T: ?Sized, A: Allocator> Arc<T, A> {
 
             // Copy value as bytes
             ptr::copy_nonoverlapping(
-                core::ptr::addr_of!(*src) as *const u8,
-                ptr::addr_of_mut!((*ptr).data) as *mut u8,
+                (&raw const *src) as *const u8,
+                (&raw mut (*ptr).data) as *mut u8,
                 value_size,
             );
 
@@ -2022,7 +2022,7 @@ impl<T> Arc<[T]> {
         unsafe {
             let ptr = Self::allocate_for_slice(v.len());
 
-            ptr::copy_nonoverlapping(v.as_ptr(), ptr::addr_of_mut!((*ptr).data) as *mut T, v.len());
+            ptr::copy_nonoverlapping(v.as_ptr(), (&raw mut (*ptr).data) as *mut T, v.len());
 
             Self::from_ptr(ptr)
         }
@@ -2061,7 +2061,7 @@ impl<T> Arc<[T]> {
             let layout = Layout::for_value_raw(ptr);
 
             // Pointer to first element
-            let elems = ptr::addr_of_mut!((*ptr).data) as *mut T;
+            let elems = (&raw mut (*ptr).data) as *mut T;
 
             let mut guard = Guard { mem: NonNull::new_unchecked(mem), elems, layout, n_elems: 0 };
 
@@ -2805,7 +2805,7 @@ impl<T: ?Sized, A: Allocator> Weak<T, A> {
             // SAFETY: if is_dangling returns false, then the pointer is dereferenceable.
             // The payload may be dropped at this point, and we have to maintain provenance,
             // so use raw pointer manipulation.
-            unsafe { ptr::addr_of_mut!((*ptr).data) }
+            unsafe { &raw mut (*ptr).data }
         }
     }
 
@@ -3428,7 +3428,7 @@ impl<T: ?Sized + fmt::Debug, A: Allocator> fmt::Debug for Arc<T, A> {
 #[stable(feature = "rust1", since = "1.0.0")]
 impl<T: ?Sized, A: Allocator> fmt::Pointer for Arc<T, A> {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        fmt::Pointer::fmt(&core::ptr::addr_of!(**self), f)
+        fmt::Pointer::fmt(&(&raw const **self), f)
     }
 }
 
@@ -3678,7 +3678,7 @@ impl<T, A: Allocator + Clone> From<Vec<T, A>> for Arc<[T], A> {
             let (vec_ptr, len, cap, alloc) = v.into_raw_parts_with_alloc();
 
             let rc_ptr = Self::allocate_for_slice_in(len, &alloc);
-            ptr::copy_nonoverlapping(vec_ptr, ptr::addr_of_mut!((*rc_ptr).data) as *mut T, len);
+            ptr::copy_nonoverlapping(vec_ptr, (&raw mut (*rc_ptr).data) as *mut T, len);
 
             // Create a `Vec<T, &A>` with length 0, to deallocate the buffer
             // without dropping its contents or the allocator

library/alloc/src/vec/into_iter.rs

@@ -21,11 +21,11 @@ use crate::raw_vec::RawVec;
 macro non_null {
     (mut $place:expr, $t:ident) => {{
         #![allow(unused_unsafe)] // we're sometimes used within an unsafe block
-        unsafe { &mut *(ptr::addr_of_mut!($place) as *mut NonNull<$t>) }
+        unsafe { &mut *((&raw mut $place) as *mut NonNull<$t>) }
     }},
     ($place:expr, $t:ident) => {{
         #![allow(unused_unsafe)] // we're sometimes used within an unsafe block
-        unsafe { *(ptr::addr_of!($place) as *const NonNull<$t>) }
+        unsafe { *((&raw const $place) as *const NonNull<$t>) }
     }},
 }
 

library/core/src/ffi/c_str.rs

@@ -5,7 +5,7 @@ use crate::error::Error;
 use crate::ffi::c_char;
 use crate::iter::FusedIterator;
 use crate::marker::PhantomData;
-use crate::ptr::{NonNull, addr_of};
+use crate::ptr::NonNull;
 use crate::slice::memchr;
 use crate::{fmt, intrinsics, ops, slice, str};
 
@@ -623,7 +623,7 @@ impl CStr {
     pub const fn to_bytes_with_nul(&self) -> &[u8] {
         // SAFETY: Transmuting a slice of `c_char`s to a slice of `u8`s
         // is safe on all supported targets.
-        unsafe { &*(addr_of!(self.inner) as *const [u8]) }
+        unsafe { &*((&raw const self.inner) as *const [u8]) }
     }
 
     /// Iterates over the bytes in this C string.

library/core/src/iter/adapters/filter_map.rs

@@ -3,7 +3,6 @@ use crate::iter::{FusedIterator, InPlaceIterable, TrustedFused};
 use crate::mem::{ManuallyDrop, MaybeUninit};
 use crate::num::NonZero;
 use crate::ops::{ControlFlow, Try};
-use crate::ptr::addr_of;
 use crate::{array, fmt};
 
 /// An iterator that uses `f` to both filter and map elements from `iter`.
@@ -101,7 +100,7 @@ where
 
             unsafe {
                 let opt_payload_at: *const MaybeUninit<B> =
-                    addr_of!(val).byte_add(core::mem::offset_of!(Option<B>, Some.0)).cast();
+                    (&raw const val).byte_add(core::mem::offset_of!(Option<B>, Some.0)).cast();
                 let dst = guard.array.as_mut_ptr().add(idx);
                 crate::ptr::copy_nonoverlapping(opt_payload_at, dst, 1);
                 crate::mem::forget(val);

library/core/src/ptr/mod.rs

@@ -1730,7 +1730,7 @@ pub const unsafe fn write_unaligned<T>(dst: *mut T, src: T) {
     // `dst` cannot overlap `src` because the caller has mutable access
     // to `dst` while `src` is owned by this function.
     unsafe {
-        copy_nonoverlapping(addr_of!(src) as *const u8, dst as *mut u8, mem::size_of::<T>());
+        copy_nonoverlapping((&raw const src) as *const u8, dst as *mut u8, mem::size_of::<T>());
         // We are calling the intrinsic directly to avoid function calls in the generated code.
         intrinsics::forget(src);
     }
@@ -2348,7 +2348,6 @@ impl<F: FnPtr> fmt::Debug for F {
 /// no difference whether the pointer is null or dangling.)
 #[stable(feature = "raw_ref_macros", since = "1.51.0")]
 #[rustc_macro_transparency = "semitransparent"]
-#[allow_internal_unstable(raw_ref_op)]
 pub macro addr_of($place:expr) {
     &raw const $place
 }
@@ -2439,7 +2438,6 @@ pub macro addr_of($place:expr) {
 /// makes no difference whether the pointer is null or dangling.)
 #[stable(feature = "raw_ref_macros", since = "1.51.0")]
 #[rustc_macro_transparency = "semitransparent"]
-#[allow_internal_unstable(raw_ref_op)]
 pub macro addr_of_mut($place:expr) {
     &raw mut $place
 }

library/core/src/slice/iter.rs

@@ -11,7 +11,7 @@ use crate::iter::{
 use crate::marker::PhantomData;
 use crate::mem::{self, SizedTypeProperties};
 use crate::num::NonZero;
-use crate::ptr::{self, NonNull, without_provenance, without_provenance_mut};
+use crate::ptr::{NonNull, without_provenance, without_provenance_mut};
 use crate::{cmp, fmt};
 
 #[stable(feature = "boxed_slice_into_iter", since = "1.80.0")]

library/core/src/slice/iter/macros.rs

@@ -14,11 +14,11 @@ macro_rules! if_zst {
         if T::IS_ZST {
             // SAFETY: for ZSTs, the pointer is storing a provenance-free length,
             // so consuming and updating it as a `usize` is fine.
-            let $len = unsafe { &mut *ptr::addr_of_mut!($this.end_or_len).cast::<usize>() };
+            let $len = unsafe { &mut *(&raw mut $this.end_or_len).cast::<usize>() };
             $zst_body
         } else {
             // SAFETY: for non-ZSTs, the type invariant ensures it cannot be null
-            let $end = unsafe { &mut *ptr::addr_of_mut!($this.end_or_len).cast::<NonNull<T>>() };
+            let $end = unsafe { &mut *(&raw mut $this.end_or_len).cast::<NonNull<T>>() };
             $other_body
         }
     }};
@@ -30,7 +30,7 @@ macro_rules! if_zst {
             $zst_body
         } else {
             // SAFETY: for non-ZSTs, the type invariant ensures it cannot be null
-            let $end = unsafe { *ptr::addr_of!($this.end_or_len).cast::<NonNull<T>>() };
+            let $end = unsafe { *(&raw const $this.end_or_len).cast::<NonNull<T>>() };
             $other_body
         }
     }};

library/core/src/slice/mod.rs

@@ -883,8 +883,8 @@ impl<T> [T] {
     pub const fn swap(&mut self, a: usize, b: usize) {
         // FIXME: use swap_unchecked here (https://github.com/rust-lang/rust/pull/88540#issuecomment-944344343)
         // Can't take two mutable loans from one vector, so instead use raw pointers.
-        let pa = ptr::addr_of_mut!(self[a]);
-        let pb = ptr::addr_of_mut!(self[b]);
+        let pa = &raw mut self[a];
+        let pb = &raw mut self[b];
         // SAFETY: `pa` and `pb` have been created from safe mutable references and refer
         // to elements in the slice and therefore are guaranteed to be valid and aligned.
         // Note that accessing the elements behind `a` and `b` is checked and will

library/panic_unwind/src/emcc.rs

@@ -78,7 +78,7 @@ pub unsafe fn cleanup(ptr: *mut u8) -> Box<dyn Any + Send> {
         super::__rust_foreign_exception();
     }
 
-    let canary = ptr::addr_of!((*adjusted_ptr).canary).read();
+    let canary = (&raw const (*adjusted_ptr).canary).read();
     if !ptr::eq(canary, &EXCEPTION_TYPE_INFO) {
         super::__rust_foreign_exception();
     }

library/panic_unwind/src/gcc.rs

@@ -92,7 +92,7 @@ pub unsafe fn cleanup(ptr: *mut u8) -> Box<dyn Any + Send> {
     let exception = exception.cast::<Exception>();
     // Just access the canary field, avoid accessing the entire `Exception` as
     // it can be a foreign Rust exception.
-    let canary = ptr::addr_of!((*exception).canary).read();
+    let canary = (&raw const (*exception).canary).read();
     if !ptr::eq(canary, &CANARY) {
         // A foreign Rust exception, treat it slightly differently from other
         // foreign exceptions, because call into `_Unwind_DeleteException` will