diff options
Diffstat (limited to 'library/alloc/src/sync.rs')
-rw-r--r-- | library/alloc/src/sync.rs | 26 |
1 files changed, 12 insertions, 14 deletions
diff --git a/library/alloc/src/sync.rs b/library/alloc/src/sync.rs index bfdb7a92b..5bb1a93ae 100644 --- a/library/alloc/src/sync.rs +++ b/library/alloc/src/sync.rs @@ -33,7 +33,7 @@ use core::sync::atomic::Ordering::{Acquire, Relaxed, Release}; #[cfg(not(no_global_oom_handling))] use crate::alloc::handle_alloc_error; #[cfg(not(no_global_oom_handling))] -use crate::alloc::{box_free, WriteCloneIntoRaw}; +use crate::alloc::WriteCloneIntoRaw; use crate::alloc::{AllocError, Allocator, Global, Layout}; use crate::borrow::{Cow, ToOwned}; use crate::boxed::Box; @@ -1267,7 +1267,7 @@ impl<T: ?Sized> Arc<T> { } /// Returns `true` if the two `Arc`s point to the same allocation in a vein similar to - /// [`ptr::eq`]. See [that function][`ptr::eq`] for caveats when comparing `dyn Trait` pointers. + /// [`ptr::eq`]. This function ignores the metadata of `dyn Trait` pointers. /// /// # Examples /// @@ -1287,7 +1287,7 @@ impl<T: ?Sized> Arc<T> { #[must_use] #[stable(feature = "ptr_eq", since = "1.17.0")] pub fn ptr_eq(this: &Self, other: &Self) -> bool { - this.ptr.as_ptr() == other.ptr.as_ptr() + this.ptr.as_ptr() as *const () == other.ptr.as_ptr() as *const () } } @@ -1360,23 +1360,21 @@ impl<T: ?Sized> Arc<T> { } #[cfg(not(no_global_oom_handling))] - fn from_box(v: Box<T>) -> Arc<T> { + fn from_box(src: Box<T>) -> Arc<T> { unsafe { - let (box_unique, alloc) = Box::into_unique(v); - let bptr = box_unique.as_ptr(); - - let value_size = size_of_val(&*bptr); - let ptr = Self::allocate_for_ptr(bptr); + let value_size = size_of_val(&*src); + let ptr = Self::allocate_for_ptr(&*src); // Copy value as bytes ptr::copy_nonoverlapping( - bptr as *const T as *const u8, + &*src as *const T as *const u8, &mut (*ptr).data as *mut _ as *mut u8, value_size, ); // Free the allocation without dropping its contents - box_free(box_unique, alloc); + let src = Box::from_raw(Box::into_raw(src) as *mut mem::ManuallyDrop<T>); + drop(src); Self::from_ptr(ptr) } @@ -2256,8 +2254,8 @@ impl<T: ?Sized> Weak<T> { } /// Returns `true` if the two `Weak`s point to the same allocation similar to [`ptr::eq`], or if - /// both don't point to any allocation (because they were created with `Weak::new()`). See [that - /// function][`ptr::eq`] for caveats when comparing `dyn Trait` pointers. + /// both don't point to any allocation (because they were created with `Weak::new()`). However, + /// this function ignores the metadata of `dyn Trait` pointers. /// /// # Notes /// @@ -2300,7 +2298,7 @@ impl<T: ?Sized> Weak<T> { #[must_use] #[stable(feature = "weak_ptr_eq", since = "1.39.0")] pub fn ptr_eq(&self, other: &Self) -> bool { - self.ptr.as_ptr() == other.ptr.as_ptr() + ptr::eq(self.ptr.as_ptr() as *const (), other.ptr.as_ptr() as *const ()) } } |