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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 09:22:09 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 09:22:09 +0000
commit43a97878ce14b72f0981164f87f2e35e14151312 (patch)
tree620249daf56c0258faa40cbdcf9cfba06de2a846 /servo/components/style_traits/dom.rs
parentInitial commit. (diff)
downloadfirefox-upstream.tar.xz
firefox-upstream.zip
Adding upstream version 110.0.1.upstream/110.0.1upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'servo/components/style_traits/dom.rs')
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1 files changed, 26 insertions, 0 deletions
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+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
+
+//! Types used to access the DOM from style calculation.
+
+/// An opaque handle to a node, which, unlike UnsafeNode, cannot be transformed
+/// back into a non-opaque representation. The only safe operation that can be
+/// performed on this node is to compare it to another opaque handle or to another
+/// OpaqueNode.
+///
+/// Layout and Graphics use this to safely represent nodes for comparison purposes.
+/// Because the script task's GC does not trace layout, node data cannot be safely stored in layout
+/// data structures. Also, layout code tends to be faster when the DOM is not being accessed, for
+/// locality reasons. Using `OpaqueNode` enforces this invariant.
+#[derive(Clone, Copy, Debug, Eq, Hash, MallocSizeOf, PartialEq)]
+#[cfg_attr(feature = "servo", derive(Deserialize, Serialize))]
+pub struct OpaqueNode(pub usize);
+
+impl OpaqueNode {
+ /// Returns the address of this node, for debugging purposes.
+ #[inline]
+ pub fn id(&self) -> usize {
+ self.0
+ }
+}