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Prevent JS execution and layout operations while DOM in inconsistent state.

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This commit is contained in:
Josh Matthews 2018-12-09 22:08:33 -05:00
parent 231a37be24
commit 14b0de30db
4 changed files with 40 additions and 0 deletions
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20
components/script/dom/document.rs
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@ -410,6 +410,8 @@ pub struct Document {
responsive_images: DomRefCell<Vec<Dom<HTMLImageElement>>>,
/// Number of redirects for the document load
redirect_count: Cell<u16>,
///
script_and_layout_blockers: Cell<u32>,
}
#[derive(JSTraceable, MallocSizeOf)]
@ -2695,9 +2697,27 @@ impl Document {
fired_unload: Cell::new(false),
responsive_images: Default::default(),
redirect_count: Cell::new(0),
script_and_layout_blockers: Cell::new(0),
}
}
pub fn add_script_and_layout_blocker(&self) {
self.script_and_layout_blockers.set(
self.script_and_layout_blockers.get() + 1
);
}
pub fn remove_script_and_layout_blocker(&self) {
assert!(self.script_and_layout_blockers.get() > 0);
self.script_and_layout_blockers.set(
self.script_and_layout_blockers.get() - 1
);
}
pub fn ensure_safe_to_run_script_or_layout(&self) {
assert_eq!(self.script_and_layout_blockers.get(), 0);
}
// https://dom.spec.whatwg.org/#dom-document-document
pub fn Constructor(window: &Window) -> Fallible<DomRoot<Document>> {
let doc = window.Document();