BTreeMap: refactor correct_childrens_parent_links
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5562bb6d74
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1e64d98761
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@ -597,18 +597,17 @@ impl<'a, K: 'a, V: 'a> NodeRef<marker::Mut<'a>, K, V, marker::Leaf> {
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impl<'a, K, V> NodeRef<marker::Mut<'a>, K, V, marker::Internal> {
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/// # Safety
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/// 'first' and 'after_last' must be in range.
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unsafe fn correct_childrens_parent_links(&mut self, first: usize, after_last: usize) {
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debug_assert!(first <= self.len());
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debug_assert!(after_last <= self.len() + 1);
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for i in first..after_last {
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/// Every item returned by `range` is a valid edge index for the node.
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unsafe fn correct_childrens_parent_links<R: Iterator<Item = usize>>(&mut self, range: R) {
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for i in range {
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debug_assert!(i <= self.len());
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unsafe { Handle::new_edge(self.reborrow_mut(), i) }.correct_parent_link();
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}
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}
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fn correct_all_childrens_parent_links(&mut self) {
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let len = self.len();
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unsafe { self.correct_childrens_parent_links(0, len + 1) };
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unsafe { self.correct_childrens_parent_links(0..=len) };
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}
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}
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@ -708,9 +707,7 @@ impl<'a, K: 'a, V: 'a> NodeRef<marker::Mut<'a>, K, V, marker::LeafOrInternal> {
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let mut new_root = Root { node: edge, height: internal.height - 1 };
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new_root.node_as_mut().as_leaf_mut().parent = None;
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for i in 0..old_len {
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Handle::new_edge(internal.reborrow_mut(), i).correct_parent_link();
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}
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internal.correct_childrens_parent_links(0..old_len);
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Some(new_root)
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}
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@ -986,9 +983,7 @@ impl<'a, K: 'a, V: 'a> Handle<NodeRef<marker::Mut<'a>, K, V, marker::Internal>,
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edge.node,
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);
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for i in (self.idx + 1)..(self.node.len() + 1) {
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Handle::new_edge(self.node.reborrow_mut(), i).correct_parent_link();
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}
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self.node.correct_childrens_parent_links((self.idx + 1)..=self.node.len());
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}
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}
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@ -1215,9 +1210,7 @@ impl<'a, K: 'a, V: 'a> Handle<NodeRef<marker::Mut<'a>, K, V, marker::Internal>,
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let mut new_root = Root { node: BoxedNode::from_internal(new_node), height };
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for i in 0..(new_len + 1) {
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Handle::new_edge(new_root.node_as_mut().cast_unchecked(), i).correct_parent_link();
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}
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new_root.node_as_mut().cast_unchecked().correct_childrens_parent_links(0..=new_len);
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(self.node, k, v, new_root)
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}
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@ -1261,9 +1254,8 @@ impl<'a, K: 'a, V: 'a> Handle<NodeRef<marker::Mut<'a>, K, V, marker::Internal>,
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);
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slice_remove(&mut self.node.as_internal_mut().edges, self.idx + 1);
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for i in self.idx + 1..self.node.len() {
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Handle::new_edge(self.node.reborrow_mut(), i).correct_parent_link();
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}
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let self_len = self.node.len();
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self.node.correct_childrens_parent_links(self.idx + 1..self_len);
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self.node.as_leaf_mut().len -= 1;
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left_node.as_leaf_mut().len += right_len as u16 + 1;
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@ -1271,17 +1263,15 @@ impl<'a, K: 'a, V: 'a> Handle<NodeRef<marker::Mut<'a>, K, V, marker::Internal>,
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if self.node.height > 1 {
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// SAFETY: the height of the nodes being merged is one below the height
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// of the node of this edge, thus above zero, so they are internal.
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let mut left_node = left_node.cast_unchecked();
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let mut right_node = right_node.cast_unchecked();
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let mut left_node = left_node.cast_unchecked::<marker::Internal>();
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let mut right_node = right_node.cast_unchecked::<marker::Internal>();
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ptr::copy_nonoverlapping(
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right_node.as_internal().edges.as_ptr(),
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left_node.as_internal_mut().edges.as_mut_ptr().add(left_len + 1),
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right_len + 1,
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);
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for i in left_len + 1..left_len + right_len + 2 {
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Handle::new_edge(left_node.reborrow_mut(), i).correct_parent_link();
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}
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left_node.correct_childrens_parent_links(left_len + 1..=left_len + 1 + right_len);
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Global.dealloc(right_node.node.cast(), Layout::new::<InternalNode<K, V>>());
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} else {
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@ -1371,7 +1361,7 @@ impl<'a, K: 'a, V: 'a> Handle<NodeRef<marker::Mut<'a>, K, V, marker::Internal>,
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// Make room for stolen edges.
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let right_edges = right.reborrow_mut().as_internal_mut().edges.as_mut_ptr();
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ptr::copy(right_edges, right_edges.add(count), right_len + 1);
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right.correct_childrens_parent_links(count, count + right_len + 1);
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right.correct_childrens_parent_links(count..count + right_len + 1);
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move_edges(left, new_left_len + 1, right, 0, count);
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}
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@ -1430,7 +1420,7 @@ impl<'a, K: 'a, V: 'a> Handle<NodeRef<marker::Mut<'a>, K, V, marker::Internal>,
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// Fix right indexing.
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let right_edges = right.reborrow_mut().as_internal_mut().edges.as_mut_ptr();
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ptr::copy(right_edges.add(count), right_edges, new_right_len + 1);
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right.correct_childrens_parent_links(0, new_right_len + 1);
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right.correct_childrens_parent_links(0..=new_right_len);
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}
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(ForceResult::Leaf(_), ForceResult::Leaf(_)) => {}
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_ => {
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@ -1466,7 +1456,7 @@ unsafe fn move_edges<K, V>(
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let dest_ptr = dest.as_internal_mut().edges.as_mut_ptr();
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unsafe {
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ptr::copy_nonoverlapping(source_ptr.add(source_offset), dest_ptr.add(dest_offset), count);
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dest.correct_childrens_parent_links(dest_offset, dest_offset + count);
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dest.correct_childrens_parent_links(dest_offset..dest_offset + count);
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}
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}
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