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Add #[must_use] to alloc functions that would leak memory

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This commit is contained in:
John Kugelman 2021-10-30 22:06:31 -04:00
parent e249ce6b23
commit 42e0282d52
2 changed files with 4 additions and 0 deletions
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3
library/alloc/src/alloc.rs
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@ -81,6 +81,7 @@
/// }
/// ```
#[stable(feature = "global_alloc", since = "1.28.0")]
#[must_use = "losing the pointer will leak memory"]
#[inline]
pub unsafe fn alloc(layout: Layout) -> *mut u8 {
unsafe { __rust_alloc(layout.size(), layout.align()) }
@ -117,6 +118,7 @@ pub unsafe fn dealloc(ptr: *mut u8, layout: Layout) {
///
/// See [`GlobalAlloc::realloc`].
#[stable(feature = "global_alloc", since = "1.28.0")]
#[must_use = "losing the pointer will leak memory"]
#[inline]
pub unsafe fn realloc(ptr: *mut u8, layout: Layout, new_size: usize) -> *mut u8 {
unsafe { __rust_realloc(ptr, layout.size(), layout.align(), new_size) }
@ -150,6 +152,7 @@ pub unsafe fn realloc(ptr: *mut u8, layout: Layout, new_size: usize) -> *mut u8
/// }
/// ```
#[stable(feature = "global_alloc", since = "1.28.0")]
#[must_use = "losing the pointer will leak memory"]
#[inline]
pub unsafe fn alloc_zeroed(layout: Layout) -> *mut u8 {
unsafe { __rust_alloc_zeroed(layout.size(), layout.align()) }

1
library/alloc/src/sync.rs
View File

@ -804,6 +804,7 @@ impl<T: ?Sized> Arc<T> {
/// let x_ptr = Arc::into_raw(x);
/// assert_eq!(unsafe { &*x_ptr }, "hello");
/// ```
#[must_use = "losing the pointer will leak memory"]
#[stable(feature = "rc_raw", since = "1.17.0")]
pub fn into_raw(this: Self) -> *const T {
let ptr = Self::as_ptr(&this);