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LibWeb: Cache the first <base href> (in tree order) in Document

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When parsing relative URLs, we have to check the first <base href> in
tree order (if one is available). This was getting *very* costly on
large DOMs with many relative urls.

This patch avoids all that repeated traversal by letting Document cache
the first <base href> and invalidating the cache whenever a <base>
element is added/removed/edited in the DOM.

The browser was stuck doing this for a *very* long time when loading
the ECMA-262 spec, and this removes that problem entirely.
This commit is contained in:
Andreas Kling 2022-11-04 20:56:30 +01:00
parent 0aca69853c
commit b400a34984
4 changed files with 23 additions and 3 deletions
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11
Userland/Libraries/LibWeb/DOM/Document.cpp
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@ -342,7 +342,7 @@ void Document::visit_edges(Cell::Visitor& visitor)
visitor.visit(m_scripts);
visitor.visit(m_all);
visitor.visit(m_selection);
visitor.visit(m_first_base_element_with_href_in_tree_order);
visitor.visit(m_parser);
for (auto& script : m_scripts_to_execute_when_parsing_has_finished)
@ -732,7 +732,7 @@ Vector<CSS::BackgroundLayerData> const* Document::background_layers() const
return &body_layout_node->background_layers();
}
JS::GCPtr<HTML::HTMLBaseElement> Document::first_base_element_with_href_in_tree_order() const
void Document::update_base_element(Badge<HTML::HTMLBaseElement>)
{
JS::GCPtr<HTML::HTMLBaseElement> base_element;
@ -745,7 +745,12 @@ JS::GCPtr<HTML::HTMLBaseElement> Document::first_base_element_with_href_in_tree_
return IterationDecision::Continue;
});
return base_element;
m_first_base_element_with_href_in_tree_order = base_element;
}
JS::GCPtr<HTML::HTMLBaseElement> Document::first_base_element_with_href_in_tree_order() const
{
return m_first_base_element_with_href_in_tree_order;
}
// https://html.spec.whatwg.org/multipage/urls-and-fetching.html#fallback-base-url