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LibWeb: Weakly store NamedNodeMap's & Attribute's associated Element

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This is similar to how Gecko avoids a reference cycle, where both the
NamedNodeMap and Attribute would otherwise store a strong reference to
their associated Element. Gecko manually clears stored raw references
when an Element is destroyed, whereas we use weak references to do so
automatically.

Attribute's ownerElement getter and setter are moved out of line to
avoid an #include cycle between Element and Attribute.
This commit is contained in:
Timothy Flynn 2021-10-17 15:09:47 -04:00 • committed by Andreas Kling
parent 356d5821e7
commit b67f6daf05
4 changed files with 35 additions and 8 deletions
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7
Userland/Libraries/LibWeb/DOM/Attribute.h
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@ -7,6 +7,7 @@
#pragma once
#include <AK/FlyString.h>
#include <AK/WeakPtr.h>
#include <LibWeb/DOM/Node.h>
#include <LibWeb/QualifiedName.h>
@ -31,8 +32,8 @@ public:
String const& value() const { return m_value; }
void set_value(String value) { m_value = move(value); }
Element const* owner_element() const { return m_owner_element; }
void set_owner_element(Element const* owner_element) { m_owner_element = owner_element; }
Element const* owner_element() const;
void set_owner_element(Element const* owner_element);
// Always returns true: https://dom.spec.whatwg.org/#dom-attr-specified
constexpr bool specified() const { return true; }
@ -42,7 +43,7 @@ private:
QualifiedName m_qualified_name;
String m_value;
Element const* m_owner_element { nullptr };
WeakPtr<Element> m_owner_element;
};
}