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LibWeb: Make BrowsingContext GC-allocated

Browse source 
(And BrowsingContextGroup had to come along for the ride as well.)
This solves a number of nasty reference cycles between browsing
contexts, history items, and their documents.
This commit is contained in:
Andreas Kling 2022-10-17 11:06:50 +02:00
parent 2898701459
commit 83c5ff57d8
15 changed files with 225 additions and 44 deletions
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91
Userland/Libraries/LibWeb/HTML/BrowsingContext.h
View file

@ -13,6 +13,7 @@
#include <LibGfx/Bitmap.h>
#include <LibGfx/Rect.h>
#include <LibGfx/Size.h>
#include <LibJS/Heap/Cell.h>
#include <LibWeb/DOM/Position.h>
#include <LibWeb/HTML/BrowsingContextContainer.h>
#include <LibWeb/HTML/HistoryHandlingBehavior.h>
@ -26,13 +27,83 @@
namespace Web::HTML {
class BrowsingContext : public TreeNode<BrowsingContext> {
class BrowsingContext final
: public JS::Cell
, public Weakable<BrowsingContext> {
JS_CELL(BrowsingContext, JS::Cell);
public:
static NonnullRefPtr<BrowsingContext> create_a_new_browsing_context(Page&, JS::GCPtr<DOM::Document> creator, JS::GCPtr<DOM::Element> embedder, BrowsingContextGroup&);
static NonnullRefPtr<BrowsingContext> create_a_new_top_level_browsing_context(Page&);
static JS::NonnullGCPtr<BrowsingContext> create_a_new_browsing_context(Page&, JS::GCPtr<DOM::Document> creator, JS::GCPtr<DOM::Element> embedder, BrowsingContextGroup&);
static JS::NonnullGCPtr<BrowsingContext> create_a_new_top_level_browsing_context(Page&);
~BrowsingContext();
JS::GCPtr<BrowsingContext> parent() const { return m_parent; }
void append_child(JS::NonnullGCPtr<BrowsingContext>);
void remove_child(JS::NonnullGCPtr<BrowsingContext>);
JS::GCPtr<BrowsingContext> first_child() const;
JS::GCPtr<BrowsingContext> next_sibling() const;
bool is_ancestor_of(BrowsingContext const&) const;
template<typename Callback>
IterationDecision for_each_in_inclusive_subtree(Callback callback) const
{
if (callback(*this) == IterationDecision::Break)
return IterationDecision::Break;
for (auto child = first_child(); child; child = child->next_sibling()) {
if (child->for_each_in_inclusive_subtree(callback) == IterationDecision::Break)
return IterationDecision::Break;
}
return IterationDecision::Continue;
}
template<typename Callback>
IterationDecision for_each_in_inclusive_subtree(Callback callback)
{
if (callback(*this) == IterationDecision::Break)
return IterationDecision::Break;
for (auto child = first_child(); child; child = child->next_sibling()) {
if (child->for_each_in_inclusive_subtree(callback) == IterationDecision::Break)
return IterationDecision::Break;
}
return IterationDecision::Continue;
}
template<typename Callback>
void for_each_child(Callback callback) const
{
for (auto node = first_child(); node; node = node->next_sibling())
callback(*node);
}
template<typename Callback>
void for_each_child(Callback callback)
{
for (auto node = first_child(); node; node = node->next_sibling())
callback(*node);
}
template<typename Callback>
IterationDecision for_each_in_subtree(Callback callback) const
{
for (auto child = first_child(); child; child = child->next_sibling()) {
if (child->for_each_in_inclusive_subtree(callback) == IterationDecision::Break)
return IterationDecision::Break;
}
return IterationDecision::Continue;
}
template<typename Callback>
IterationDecision for_each_in_subtree(Callback callback)
{
for (auto child = first_child(); child; child = child->next_sibling()) {
if (child->for_each_in_inclusive_subtree(callback) == IterationDecision::Break)
return IterationDecision::Break;
}
return IterationDecision::Continue;
}
class ViewportClient {
public:
virtual ~ViewportClient() = default;
@ -178,6 +249,8 @@ public:
private:
explicit BrowsingContext(Page&, HTML::BrowsingContextContainer*);
virtual void visit_edges(Cell::Visitor&) override;
void reset_cursor_blink_cycle();
void scroll_offset_did_change();
@ -204,12 +277,12 @@ private:
// https://html.spec.whatwg.org/multipage/browsers.html#creator-origin
Optional<HTML::Origin> m_creator_origin;
WeakPtr<HTML::BrowsingContextContainer> m_container;
JS::GCPtr<HTML::BrowsingContextContainer> m_container;
Gfx::IntSize m_size;
Gfx::IntPoint m_viewport_scroll_offset;
// https://html.spec.whatwg.org/multipage/browsers.html#browsing-context
JS::Handle<HTML::WindowProxy> m_window_proxy;
JS::GCPtr<HTML::WindowProxy> m_window_proxy;
DOM::Position m_cursor_position;
RefPtr<Platform::Timer> m_cursor_blink_timer;
@ -221,10 +294,16 @@ private:
String m_name;
// https://html.spec.whatwg.org/multipage/browsers.html#tlbc-group
RefPtr<BrowsingContextGroup> m_group;
JS::GCPtr<BrowsingContextGroup> m_group;
// https://html.spec.whatwg.org/multipage/interaction.html#system-visibility-state
VisibilityState m_system_visibility_state { VisibilityState::Hidden };
JS::GCPtr<BrowsingContext> m_parent;
JS::GCPtr<BrowsingContext> m_first_child;
JS::GCPtr<BrowsingContext> m_last_child;
JS::GCPtr<BrowsingContext> m_next_sibling;
JS::GCPtr<BrowsingContext> m_previous_sibling;
};
HTML::Origin determine_the_origin(BrowsingContext const& browsing_context, Optional<AK::URL> url, SandboxingFlagSet sandbox_flags, Optional<HTML::Origin> invocation_origin);