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Make LayoutNodeHelpers::composed_parent_node_ref be safe

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For clarity, I introduce <LayoutDom<Element>>::parent_node_ref to contain
the remaining unsafety bits out of composed_parent_node_ref which is more
complex than just a field access.
This commit is contained in:
Anthony Ramine 2020-03-31 22:32:35 +02:00
parent f712b0bcf8
commit fc07a5147c
4 changed files with 44 additions and 50 deletions
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17
components/script/dom/node.rs
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@ -1307,7 +1307,7 @@ pub unsafe fn from_untrusted_node_address(
pub trait LayoutNodeHelpers<'dom> {
fn type_id_for_layout(self) -> NodeTypeId;
unsafe fn composed_parent_node_ref(self) -> Option<LayoutDom<'dom, Node>>;
fn composed_parent_node_ref(self) -> Option<LayoutDom<'dom, Node>>;
fn first_child_ref(self) -> Option<LayoutDom<'dom, Node>>;
fn last_child_ref(self) -> Option<LayoutDom<'dom, Node>>;
fn prev_sibling_ref(self) -> Option<LayoutDom<'dom, Node>>;
@ -1339,6 +1339,14 @@ pub trait LayoutNodeHelpers<'dom> {
fn opaque(self) -> OpaqueNode;
}
impl<'dom> LayoutDom<'dom, Node> {
#[inline]
#[allow(unsafe_code)]
fn parent_node_ref(self) -> Option<LayoutDom<'dom, Node>> {
unsafe { self.unsafe_get().parent_node.get_inner_as_layout() }
}
}
impl<'dom> LayoutNodeHelpers<'dom> for LayoutDom<'dom, Node> {
#[inline]
#[allow(unsafe_code)]
@ -1352,10 +1360,9 @@ impl<'dom> LayoutNodeHelpers<'dom> for LayoutDom<'dom, Node> {
}
#[inline]
#[allow(unsafe_code)]
unsafe fn composed_parent_node_ref(self) -> Option<LayoutDom<'dom, Node>> {
let parent = (*self.unsafe_get()).parent_node.get_inner_as_layout();
if let Some(ref parent) = parent {
fn composed_parent_node_ref(self) -> Option<LayoutDom<'dom, Node>> {
let parent = self.parent_node_ref();
if let Some(parent) = parent {
if let Some(shadow_root) = parent.downcast::<ShadowRoot>() {
return Some(shadow_root.get_host_for_layout().upcast());
}