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diff --git a/layout/style/ServoCSSRuleList.h b/layout/style/ServoCSSRuleList.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/* representation of CSSRuleList for stylo */
+
+#ifndef mozilla_ServoCSSRuleList_h
+#define mozilla_ServoCSSRuleList_h
+
+#include "mozilla/ServoBindingTypes.h"
+#include "mozilla/dom/CSSRuleList.h"
+
+namespace mozilla {
+
+namespace dom {
+class CSSStyleRule;
+} // namespace dom
+class StyleSheet;
+namespace css {
+class GroupRule;
+class Rule;
+} // namespace css
+
+class ServoCSSRuleList final : public dom::CSSRuleList {
+ public:
+ ServoCSSRuleList(already_AddRefed<StyleLockedCssRules> aRawRules,
+ StyleSheet* aSheet, css::GroupRule* aParentRule);
+ css::GroupRule* GetParentRule() const { return mParentRule; }
+ void DropSheetReference();
+ void DropParentRuleReference();
+
+ void DropReferences() {
+ DropSheetReference();
+ DropParentRuleReference();
+ }
+
+ NS_DECL_ISUPPORTS_INHERITED
+ NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(ServoCSSRuleList, dom::CSSRuleList)
+
+ StyleSheet* GetParentObject() final { return mStyleSheet; }
+
+ css::Rule* IndexedGetter(uint32_t aIndex, bool& aFound) final;
+ uint32_t Length() final { return mRules.Length(); }
+
+ css::Rule* GetRule(uint32_t aIndex);
+ nsresult InsertRule(const nsACString& aRule, uint32_t aIndex);
+ nsresult DeleteRule(uint32_t aIndex);
+
+ // aFromClone says whether this comes from a clone of the stylesheet (and thus
+ // we should also fix up the wrappers for the individual rules in the rule
+ // lists).
+ void SetRawContents(RefPtr<StyleLockedCssRules>, bool aFromClone);
+ void SetRawAfterClone(RefPtr<StyleLockedCssRules> aRules) {
+ SetRawContents(std::move(aRules), /* aFromClone = */ true);
+ }
+
+ private:
+ virtual ~ServoCSSRuleList();
+
+ // XXX Is it possible to have an address lower than or equal to 255?
+ // Is it possible to have more than 255 CSS rule types?
+ static const uintptr_t kMaxRuleType = UINT8_MAX;
+
+ static uintptr_t CastToUint(css::Rule* aPtr) {
+ return reinterpret_cast<uintptr_t>(aPtr);
+ }
+ static css::Rule* CastToPtr(uintptr_t aInt) {
+ MOZ_ASSERT(aInt > kMaxRuleType);
+ return reinterpret_cast<css::Rule*>(aInt);
+ }
+
+ template <typename Func>
+ void EnumerateInstantiatedRules(Func aCallback);
+
+ void DropAllRules();
+ void ResetRules();
+
+ bool IsReadOnly() const;
+
+ // mStyleSheet may be nullptr when it drops the reference to us.
+ StyleSheet* mStyleSheet = nullptr;
+ // mParentRule is nullptr if it isn't a nested rule list.
+ css::GroupRule* mParentRule = nullptr;
+ RefPtr<StyleLockedCssRules> mRawRules;
+ // Array stores either a number indicating rule type, or a pointer to
+ // css::Rule. If the value is less than kMaxRuleType, the given rule
+ // instance has not been constructed, and the value means the type
+ // of the rule. Otherwise, it is a pointer.
+ nsTArray<uintptr_t> mRules;
+};
+
+} // namespace mozilla
+
+#endif // mozilla_ServoCSSRuleList_h