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fix some incorrect aliasing in the BTree #78476

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Merged
merged 1 commit into from
Nov 9, 2020
Merged

fix some incorrect aliasing in the BTree #78476

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12 changes: 8 additions & 4 deletions library/alloc/src/collections/btree/node.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -1608,15 +1608,19 @@ pub mod marker {

unsafe fn slice_insert<T>(slice: &mut [T], idx: usize, val: T) {
unsafe {
ptr::copy(slice.as_ptr().add(idx), slice.as_mut_ptr().add(idx + 1), slice.len() - idx);
ptr::write(slice.get_unchecked_mut(idx), val);
let len = slice.len();
let slice_ptr = slice.as_mut_ptr();
ptr::copy(slice_ptr.add(idx), slice_ptr.add(idx + 1), len - idx);
ptr::write(slice_ptr.add(idx), val);
}
}

unsafe fn slice_remove<T>(slice: &mut [T], idx: usize) -> T {
unsafe {
let ret = ptr::read(slice.get_unchecked(idx));
ptr::copy(slice.as_ptr().add(idx + 1), slice.as_mut_ptr().add(idx), slice.len() - idx - 1);
let len = slice.len();
let slice_ptr = slice.as_mut_ptr();
let ret = ptr::read(slice_ptr.add(idx));
ptr::copy(slice_ptr.add(idx + 1), slice_ptr.add(idx), len - idx - 1);
ret
}
}
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