LibJS+Everywhere: Allow Cell::initialize overrides to throw OOM errors

Note that as of this commit, there aren't any such throwers, and the
call site in Heap::allocate will drop exceptions on the floor. This
commit only serves to change the declaration of the overrides, make sure
they return an empty value, and to propagate OOM errors frm their base
initialize invocations.

Userland/Libraries/LibWeb/CSS/CSSConditionRule.cpp

@@ -22,10 +22,12 @@ void CSSConditionRule::for_each_effective_style_rule(Function<void(CSSStyleRule
         CSSGroupingRule::for_each_effective_style_rule(callback);
 }
 
-void CSSConditionRule::initialize(JS::Realm& realm)
+JS::ThrowCompletionOr<void> CSSConditionRule::initialize(JS::Realm& realm)
 {
-    Base::initialize(realm);
+    MUST_OR_THROW_OOM(Base::initialize(realm));
     set_prototype(&Bindings::ensure_web_prototype<Bindings::CSSConditionRulePrototype>(realm, "CSSConditionRule"));
+
+    return {};
 }
 
 }

Userland/Libraries/LibWeb/CSS/CSSConditionRule.h

@@ -27,7 +27,7 @@ public:
 protected:
     CSSConditionRule(JS::Realm&, CSSRuleList&);
 
-    virtual void initialize(JS::Realm&) override;
+    virtual JS::ThrowCompletionOr<void> initialize(JS::Realm&) override;
 };
 
 }

Userland/Libraries/LibWeb/CSS/CSSFontFaceRule.cpp

@@ -23,10 +23,12 @@ CSSFontFaceRule::CSSFontFaceRule(JS::Realm& realm, FontFace&& font_face)
 {
 }
 
-void CSSFontFaceRule::initialize(JS::Realm& realm)
+JS::ThrowCompletionOr<void> CSSFontFaceRule::initialize(JS::Realm& realm)
 {
-    Base::initialize(realm);
+    MUST_OR_THROW_OOM(Base::initialize(realm));
     set_prototype(&Bindings::ensure_web_prototype<Bindings::CSSFontFaceRulePrototype>(realm, "CSSFontFaceRule"));
+
+    return {};
 }
 
 CSSStyleDeclaration* CSSFontFaceRule::style()

Userland/Libraries/LibWeb/CSS/CSSFontFaceRule.h

@@ -28,7 +28,7 @@ public:
 private:
     CSSFontFaceRule(JS::Realm&, FontFace&&);
 
-    virtual void initialize(JS::Realm&) override;
+    virtual JS::ThrowCompletionOr<void> initialize(JS::Realm&) override;
     virtual DeprecatedString serialized() const override;
 
     FontFace m_font_face;

Userland/Libraries/LibWeb/CSS/CSSGroupingRule.cpp

@@ -22,10 +22,12 @@ CSSGroupingRule::CSSGroupingRule(JS::Realm& realm, CSSRuleList& rules)
         rule.set_parent_rule(this);
 }
 
-void CSSGroupingRule::initialize(JS::Realm& realm)
+JS::ThrowCompletionOr<void> CSSGroupingRule::initialize(JS::Realm& realm)
 {
-    Base::initialize(realm);
+    MUST_OR_THROW_OOM(Base::initialize(realm));
     set_prototype(&Bindings::ensure_web_prototype<Bindings::CSSGroupingRulePrototype>(realm, "CSSGroupingRule"));
+
+    return {};
 }
 
 void CSSGroupingRule::visit_edges(Cell::Visitor& visitor)

Userland/Libraries/LibWeb/CSS/CSSGroupingRule.h

@@ -33,7 +33,7 @@ public:
 protected:
     CSSGroupingRule(JS::Realm&, CSSRuleList&);
 
-    virtual void initialize(JS::Realm&) override;
+    virtual JS::ThrowCompletionOr<void> initialize(JS::Realm&) override;
     virtual void visit_edges(Cell::Visitor&) override;
 
 private:

Userland/Libraries/LibWeb/CSS/CSSImportRule.cpp

@@ -39,10 +39,12 @@ CSSImportRule::CSSImportRule(AK::URL url, DOM::Document& document)
     set_resource(ResourceLoader::the().load_resource(Resource::Type::Generic, request));
 }
 
-void CSSImportRule::initialize(JS::Realm& realm)
+JS::ThrowCompletionOr<void> CSSImportRule::initialize(JS::Realm& realm)
 {
-    Base::initialize(realm);
+    MUST_OR_THROW_OOM(Base::initialize(realm));
     set_prototype(&Bindings::ensure_web_prototype<Bindings::CSSImportRulePrototype>(realm, "CSSImportRule"));
+
+    return {};
 }
 
 void CSSImportRule::visit_edges(Cell::Visitor& visitor)

Userland/Libraries/LibWeb/CSS/CSSImportRule.h

@@ -40,7 +40,7 @@ public:
 private:
     CSSImportRule(AK::URL, DOM::Document&);
 
-    virtual void initialize(JS::Realm&) override;
+    virtual JS::ThrowCompletionOr<void> initialize(JS::Realm&) override;
     virtual void visit_edges(Cell::Visitor&) override;
 
     virtual DeprecatedString serialized() const override;

Userland/Libraries/LibWeb/CSS/CSSMediaRule.cpp

@@ -23,10 +23,12 @@ CSSMediaRule::CSSMediaRule(JS::Realm& realm, MediaList& media, CSSRuleList& rule
 {
 }
 
-void CSSMediaRule::initialize(JS::Realm& realm)
+JS::ThrowCompletionOr<void> CSSMediaRule::initialize(JS::Realm& realm)
 {
-    Base::initialize(realm);
+    MUST_OR_THROW_OOM(Base::initialize(realm));
     set_prototype(&Bindings::ensure_web_prototype<Bindings::CSSMediaRulePrototype>(realm, "CSSMediaRule"));
+
+    return {};
 }
 
 void CSSMediaRule::visit_edges(Cell::Visitor& visitor)

Userland/Libraries/LibWeb/CSS/CSSMediaRule.h

@@ -35,7 +35,7 @@ public:
 private:
     CSSMediaRule(JS::Realm&, MediaList&, CSSRuleList&);
 
-    virtual void initialize(JS::Realm&) override;
+    virtual JS::ThrowCompletionOr<void> initialize(JS::Realm&) override;
     virtual void visit_edges(Cell::Visitor&) override;
     virtual DeprecatedString serialized() const override;
 

Userland/Libraries/LibWeb/CSS/CSSRuleList.cpp

@@ -35,10 +35,12 @@ CSSRuleList* CSSRuleList::create_empty(JS::Realm& realm)
     return realm.heap().allocate<CSSRuleList>(realm, realm);
 }
 
-void CSSRuleList::initialize(JS::Realm& realm)
+JS::ThrowCompletionOr<void> CSSRuleList::initialize(JS::Realm& realm)
 {
-    Base::initialize(realm);
+    MUST_OR_THROW_OOM(Base::initialize(realm));
     set_prototype(&Bindings::ensure_web_prototype<Bindings::CSSRuleListPrototype>(realm, "CSSRuleList"));
+
+    return {};
 }
 
 void CSSRuleList::visit_edges(Cell::Visitor& visitor)

Userland/Libraries/LibWeb/CSS/CSSRuleList.h

@@ -66,7 +66,7 @@ public:
 private:
     explicit CSSRuleList(JS::Realm&);
 
-    virtual void initialize(JS::Realm&) override;
+    virtual JS::ThrowCompletionOr<void> initialize(JS::Realm&) override;
     virtual void visit_edges(Cell::Visitor&) override;
 
     Vector<CSSRule&> m_rules;

Userland/Libraries/LibWeb/CSS/CSSStyleRule.cpp

@@ -23,10 +23,12 @@ CSSStyleRule::CSSStyleRule(JS::Realm& realm, NonnullRefPtrVector<Selector>&& sel
 {
 }
 
-void CSSStyleRule::initialize(JS::Realm& realm)
+JS::ThrowCompletionOr<void> CSSStyleRule::initialize(JS::Realm& realm)
 {
-    Base::initialize(realm);
+    MUST_OR_THROW_OOM(Base::initialize(realm));
     set_prototype(&Bindings::ensure_web_prototype<Bindings::CSSStyleRulePrototype>(realm, "CSSStyleRule"));
+
+    return {};
 }
 
 void CSSStyleRule::visit_edges(Cell::Visitor& visitor)

Userland/Libraries/LibWeb/CSS/CSSStyleRule.h

@@ -36,7 +36,7 @@ public:
 private:
     CSSStyleRule(JS::Realm&, NonnullRefPtrVector<Selector>&&, CSSStyleDeclaration&);
 
-    virtual void initialize(JS::Realm&) override;
+    virtual JS::ThrowCompletionOr<void> initialize(JS::Realm&) override;
     virtual void visit_edges(Cell::Visitor&) override;
     virtual DeprecatedString serialized() const override;
 

Userland/Libraries/LibWeb/CSS/CSSStyleSheet.cpp

@@ -30,10 +30,12 @@ CSSStyleSheet::CSSStyleSheet(JS::Realm& realm, CSSRuleList& rules, MediaList& me
         rule.set_parent_style_sheet(this);
 }
 
-void CSSStyleSheet::initialize(JS::Realm& realm)
+JS::ThrowCompletionOr<void> CSSStyleSheet::initialize(JS::Realm& realm)
 {
-    Base::initialize(realm);
+    MUST_OR_THROW_OOM(Base::initialize(realm));
     set_prototype(&Bindings::ensure_web_prototype<Bindings::CSSStyleSheetPrototype>(realm, "CSSStyleSheet"));
+
+    return {};
 }
 
 void CSSStyleSheet::visit_edges(Cell::Visitor& visitor)

Userland/Libraries/LibWeb/CSS/CSSStyleSheet.h

@@ -52,7 +52,7 @@ public:
 private:
     CSSStyleSheet(JS::Realm&, CSSRuleList&, MediaList&, Optional<AK::URL> location);
 
-    virtual void initialize(JS::Realm&) override;
+    virtual JS::ThrowCompletionOr<void> initialize(JS::Realm&) override;
     virtual void visit_edges(Cell::Visitor&) override;
 
     CSSRuleList* m_rules { nullptr };

Userland/Libraries/LibWeb/CSS/CSSSupportsRule.cpp

@@ -22,10 +22,12 @@ CSSSupportsRule::CSSSupportsRule(JS::Realm& realm, NonnullRefPtr<Supports>&& sup
 {
 }
 
-void CSSSupportsRule::initialize(JS::Realm& realm)
+JS::ThrowCompletionOr<void> CSSSupportsRule::initialize(JS::Realm& realm)
 {
-    Base::initialize(realm);
+    MUST_OR_THROW_OOM(Base::initialize(realm));
     set_prototype(&Bindings::ensure_web_prototype<Bindings::CSSSupportsRulePrototype>(realm, "CSSSupportsRule"));
+
+    return {};
 }
 
 DeprecatedString CSSSupportsRule::condition_text() const

Userland/Libraries/LibWeb/CSS/CSSSupportsRule.h

@@ -33,7 +33,7 @@ public:
 private:
     CSSSupportsRule(JS::Realm&, NonnullRefPtr<Supports>&&, CSSRuleList&);
 
-    virtual void initialize(JS::Realm&) override;
+    virtual JS::ThrowCompletionOr<void> initialize(JS::Realm&) override;
     virtual DeprecatedString serialized() const override;
 
     NonnullRefPtr<Supports> m_supports;

Userland/Libraries/LibWeb/CSS/MediaList.cpp

@@ -23,10 +23,12 @@ MediaList::MediaList(JS::Realm& realm, NonnullRefPtrVector<MediaQuery>&& media)
 {
 }
 
-void MediaList::initialize(JS::Realm& realm)
+JS::ThrowCompletionOr<void> MediaList::initialize(JS::Realm& realm)
 {
-    Base::initialize(realm);
+    MUST_OR_THROW_OOM(Base::initialize(realm));
     set_prototype(&Bindings::ensure_web_prototype<Bindings::MediaListPrototype>(realm, "MediaList"));
+
+    return {};
 }
 
 // https://www.w3.org/TR/cssom-1/#dom-medialist-mediatext

Userland/Libraries/LibWeb/CSS/MediaList.h

@@ -39,7 +39,7 @@ public:
 private:
     MediaList(JS::Realm&, NonnullRefPtrVector<MediaQuery>&&);
 
-    virtual void initialize(JS::Realm&) override;
+    virtual JS::ThrowCompletionOr<void> initialize(JS::Realm&) override;
 
     NonnullRefPtrVector<MediaQuery> m_media;
 };

Userland/Libraries/LibWeb/CSS/MediaQueryList.cpp

@@ -28,10 +28,12 @@ MediaQueryList::MediaQueryList(DOM::Document& document, NonnullRefPtrVector<Medi
     evaluate();
 }
 
-void MediaQueryList::initialize(JS::Realm& realm)
+JS::ThrowCompletionOr<void> MediaQueryList::initialize(JS::Realm& realm)
 {
-    Base::initialize(realm);
+    MUST_OR_THROW_OOM(Base::initialize(realm));
     set_prototype(&Bindings::ensure_web_prototype<Bindings::MediaQueryListPrototype>(realm, "MediaQueryList"));
+
+    return {};
 }
 
 void MediaQueryList::visit_edges(Cell::Visitor& visitor)

Userland/Libraries/LibWeb/CSS/MediaQueryList.h

@@ -34,7 +34,7 @@ public:
 private:
     MediaQueryList(DOM::Document&, NonnullRefPtrVector<MediaQuery>&&);
 
-    virtual void initialize(JS::Realm&) override;
+    virtual JS::ThrowCompletionOr<void> initialize(JS::Realm&) override;
     virtual void visit_edges(Cell::Visitor&) override;
 
     JS::NonnullGCPtr<DOM::Document> m_document;

Userland/Libraries/LibWeb/CSS/MediaQueryListEvent.cpp

@@ -24,10 +24,12 @@ MediaQueryListEvent::MediaQueryListEvent(JS::Realm& realm, DeprecatedFlyString c
 
 MediaQueryListEvent::~MediaQueryListEvent() = default;
 
-void MediaQueryListEvent::initialize(JS::Realm& realm)
+JS::ThrowCompletionOr<void> MediaQueryListEvent::initialize(JS::Realm& realm)
 {
-    Base::initialize(realm);
+    MUST_OR_THROW_OOM(Base::initialize(realm));
     set_prototype(&Bindings::ensure_web_prototype<Bindings::MediaQueryListEventPrototype>(realm, "MediaQueryListEvent"));
+
+    return {};
 }
 
 }

Userland/Libraries/LibWeb/CSS/MediaQueryListEvent.h

@@ -29,7 +29,7 @@ public:
 private:
     MediaQueryListEvent(JS::Realm&, DeprecatedFlyString const& event_name, MediaQueryListEventInit const& event_init);
 
-    virtual void initialize(JS::Realm&) override;
+    virtual JS::ThrowCompletionOr<void> initialize(JS::Realm&) override;
 
     DeprecatedString m_media;
     bool m_matches;

Userland/Libraries/LibWeb/CSS/Screen.cpp

@@ -24,10 +24,12 @@ Screen::Screen(HTML::Window& window)
 {
 }
 
-void Screen::initialize(JS::Realm& realm)
+JS::ThrowCompletionOr<void> Screen::initialize(JS::Realm& realm)
 {
-    Base::initialize(realm);
+    MUST_OR_THROW_OOM(Base::initialize(realm));
     set_prototype(&Bindings::ensure_web_prototype<Bindings::ScreenPrototype>(realm, "Screen"));
+
+    return {};
 }
 
 void Screen::visit_edges(Cell::Visitor& visitor)

Userland/Libraries/LibWeb/CSS/Screen.h

@@ -29,7 +29,7 @@ public:
 private:
     explicit Screen(HTML::Window&);
 
-    virtual void initialize(JS::Realm&) override;
+    virtual JS::ThrowCompletionOr<void> initialize(JS::Realm&) override;
     virtual void visit_edges(Cell::Visitor&) override;
 
     HTML::Window const& window() const { return *m_window; }

Userland/Libraries/LibWeb/CSS/StyleSheetList.cpp

@@ -57,10 +57,12 @@ StyleSheetList::StyleSheetList(DOM::Document& document)
 {
 }
 
-void StyleSheetList::initialize(JS::Realm& realm)
+JS::ThrowCompletionOr<void> StyleSheetList::initialize(JS::Realm& realm)
 {
-    Base::initialize(realm);
+    MUST_OR_THROW_OOM(Base::initialize(realm));
     set_prototype(&Bindings::ensure_web_prototype<Bindings::StyleSheetListPrototype>(realm, "StyleSheetList"));
+
+    return {};
 }
 
 void StyleSheetList::visit_edges(Cell::Visitor& visitor)

Userland/Libraries/LibWeb/CSS/StyleSheetList.h

@@ -41,7 +41,7 @@ public:
 private:
     explicit StyleSheetList(DOM::Document&);
 
-    virtual void initialize(JS::Realm&) override;
+    virtual JS::ThrowCompletionOr<void> initialize(JS::Realm&) override;
     virtual void visit_edges(Cell::Visitor&) override;
 
     void sort_sheets();