Bug 1444580: Devirtualize GetRootElementInternal, and move nsINode overrides to nsIDocument. r=smaug

MozReview-Commit-ID: IlgHXhETOIa

dom/base/nsDocument.cpp

@@ -4184,9 +4184,9 @@ nsIDocument::FindContentForSubDocument(nsIDocument *aDocument) const
 }
 
 bool
-nsDocument::IsNodeOfType(uint32_t aFlags) const
+nsIDocument::IsNodeOfType(uint32_t aFlags) const
 {
-    return !(aFlags & ~eDOCUMENT);
+  return !(aFlags & ~eDOCUMENT);
 }
 
 Element*
@@ -4203,7 +4203,7 @@ nsIDocument::GetUnfocusedKeyEventTarget()
 }
 
 Element*
-nsDocument::GetRootElementInternal() const
+nsIDocument::GetRootElementInternal() const
 {
   // We invoke GetRootElement() immediately before the servo traversal, so we
   // should always have a cache hit from Servo.
@@ -4215,36 +4215,19 @@ nsDocument::GetRootElementInternal() const
   for (i = mChildren.ChildCount(); i > 0; --i) {
     nsIContent* child = mChildren.ChildAt(i - 1);
     if (child->IsElement()) {
-      const_cast<nsDocument*>(this)->mCachedRootElement = child->AsElement();
+      const_cast<nsIDocument*>(this)->mCachedRootElement = child->AsElement();
       return child->AsElement();
     }
   }
 
-  const_cast<nsDocument*>(this)->mCachedRootElement = nullptr;
+  const_cast<nsIDocument*>(this)->mCachedRootElement = nullptr;
   return nullptr;
 }
 
-nsIContent *
-nsDocument::GetChildAt_Deprecated(uint32_t aIndex) const
-{
-  return mChildren.GetSafeChildAt(aIndex);
-}
-
-int32_t
-nsDocument::ComputeIndexOf(const nsINode* aPossibleChild) const
-{
-  return mChildren.IndexOfChild(aPossibleChild);
-}
-
-uint32_t
-nsDocument::GetChildCount() const
-{
-  return mChildren.ChildCount();
-}
-
 nsresult
-nsDocument::InsertChildBefore(nsIContent* aKid, nsIContent* aBeforeThis,
-                            bool aNotify)
+nsIDocument::InsertChildBefore(nsIContent* aKid,
+                               nsIContent* aBeforeThis,
+                               bool aNotify)
 {
   if (aKid->IsElement() && GetRootElement()) {
     NS_WARNING("Inserting root element when we already have one");
@@ -4258,8 +4241,9 @@ nsDocument::InsertChildBefore(nsIContent* aKid, nsIContent* aBeforeThis,
 }
 
 nsresult
-nsDocument::InsertChildAt_Deprecated(nsIContent* aKid, uint32_t aIndex,
-                                     bool aNotify)
+nsIDocument::InsertChildAt_Deprecated(nsIContent* aKid,
+                                      uint32_t aIndex,
+                                      bool aNotify)
 {
   if (aKid->IsElement() && GetRootElement()) {
     NS_WARNING("Inserting root element when we already have one");
@@ -4270,7 +4254,7 @@ nsDocument::InsertChildAt_Deprecated(nsIContent* aKid, uint32_t aIndex,
 }
 
 void
-nsDocument::RemoveChildAt_Deprecated(uint32_t aIndex, bool aNotify)
+nsIDocument::RemoveChildAt_Deprecated(uint32_t aIndex, bool aNotify)
 {
   nsCOMPtr<nsIContent> oldKid = GetChildAt_Deprecated(aIndex);
   if (!oldKid) {
@@ -4297,7 +4281,7 @@ nsDocument::RemoveChildAt_Deprecated(uint32_t aIndex, bool aNotify)
 }
 
 void
-nsDocument::RemoveChildNode(nsIContent* aKid, bool aNotify)
+nsIDocument::RemoveChildNode(nsIContent* aKid, bool aNotify)
 {
   if (aKid->IsElement()) {
     // Destroy the link map up front before we mess with the child list.
@@ -8763,7 +8747,7 @@ nsDocument::MutationEventDispatched(nsINode* aTarget)
 }
 
 void
-nsDocument::DestroyElementMaps()
+nsIDocument::DestroyElementMaps()
 {
 #ifdef DEBUG
   mStyledLinksCleared = true;

dom/base/nsDocument.h

@@ -45,7 +45,6 @@
 #include "nsIApplicationCacheContainer.h"
 #include "mozilla/StyleSetHandle.h"
 #include "PLDHashTable.h"
-#include "nsAttrAndChildArray.h"
 #include "nsDOMAttributeMap.h"
 #include "nsIContentViewer.h"
 #include "nsIInterfaceRequestor.h"
@@ -369,8 +368,6 @@ public:
     return mTimelines;
   }
 
-  virtual Element* GetRootElementInternal() const override;
-
   virtual nsIChannel* GetChannel() const override {
     return mChannel;
   }
@@ -407,23 +404,6 @@ public:
   virtual void WillDispatchMutationEvent(nsINode* aTarget) override;
   virtual void MutationEventDispatched(nsINode* aTarget) override;
 
-  // nsINode
-  virtual bool IsNodeOfType(uint32_t aFlags) const override;
-  virtual nsIContent *GetChildAt_Deprecated(uint32_t aIndex) const override;
-  virtual int32_t ComputeIndexOf(const nsINode* aPossibleChild) const override;
-  virtual uint32_t GetChildCount() const override;
-  virtual nsresult InsertChildBefore(nsIContent* aKid, nsIContent* aBeforeThis,
-                                     bool aNotify) override;
-  virtual nsresult InsertChildAt_Deprecated(nsIContent* aKid, uint32_t aIndex,
-                                            bool aNotify) override;
-  virtual void RemoveChildAt_Deprecated(uint32_t aIndex, bool aNotify) override;
-  virtual void RemoveChildNode(nsIContent* aKid, bool aNotify) override;
-  virtual nsresult Clone(mozilla::dom::NodeInfo *aNodeInfo, nsINode **aResult,
-                         bool aPreallocateChildren) const override
-  {
-    return NS_ERROR_NOT_IMPLEMENTED;
-  }
-
   // nsIRadioGroupContainer
   NS_IMETHOD WalkRadioGroup(const nsAString& aName,
                             nsIRadioVisitor* aVisitor,
@@ -695,10 +675,6 @@ protected:
                          NotNull<const Encoding*>& aEncoding,
                          nsHtml5TreeOpExecutor* aExecutor);
 
-  // Call this before the document does something that will unbind all content.
-  // That will stop us from doing a lot of work as each element is removed.
-  void DestroyElementMaps();
-
   nsIContent* GetFirstBaseNodeWithHref();
   nsresult SetFirstBaseNodeWithHref(nsIContent *node);
 
@@ -735,9 +711,6 @@ protected:
 
   void EnsureOnloadBlocker();
 
-  // Array of owning references to all children
-  nsAttrAndChildArray mChildren;
-
   // Tracker for animations that are waiting to start.
   // nullptr until GetOrCreatePendingAnimationTracker is called.
   RefPtr<mozilla::PendingAnimationTracker> mPendingAnimationTracker;

dom/base/nsIDocument.h

@@ -8,6 +8,7 @@
 
 #include "jsfriendapi.h"
 #include "mozilla/FlushType.h"           // for enum
+#include "nsAttrAndChildArray.h"
 #include "nsAutoPtr.h"                   // for member
 #include "nsCOMArray.h"                  // for member
 #include "nsCompatibility.h"             // for member
@@ -336,6 +337,36 @@ public:
   virtual void SetSuppressParserErrorConsoleMessages(bool aSuppress) {}
   virtual bool SuppressParserErrorConsoleMessages() { return false; }
 
+  // nsINode
+  bool IsNodeOfType(uint32_t aFlags) const final;
+  nsIContent* GetChildAt_Deprecated(uint32_t aIndex) const final
+  {
+    return mChildren.GetSafeChildAt(aIndex);
+  }
+
+  int32_t ComputeIndexOf(const nsINode* aPossibleChild) const final
+  {
+    return mChildren.IndexOfChild(aPossibleChild);
+  }
+
+  uint32_t GetChildCount() const final
+  {
+    return mChildren.ChildCount();
+  }
+
+  nsresult InsertChildBefore(nsIContent* aKid, nsIContent* aBeforeThis,
+                             bool aNotify) override;
+  nsresult InsertChildAt_Deprecated(nsIContent* aKid, uint32_t aIndex,
+                                    bool aNotify) override;
+  void RemoveChildAt_Deprecated(uint32_t aIndex, bool aNotify) final;
+  void RemoveChildNode(nsIContent* aKid, bool aNotify) final;
+  nsresult Clone(mozilla::dom::NodeInfo* aNodeInfo,
+                 nsINode **aResult,
+                 bool aPreallocateChildren) const override
+  {
+    return NS_ERROR_NOT_IMPLEMENTED;
+  }
+
   /**
    * Signal that the document title may have changed
    * (see nsDocument::GetTitle).
@@ -1180,7 +1211,11 @@ public:
   mozilla::Maybe<mozilla::dom::ServiceWorkerDescriptor> GetController() const;
 
 protected:
-  virtual Element* GetRootElementInternal() const = 0;
+  // Call this before the document does something that will unbind all content.
+  // That will stop us from doing a lot of work as each element is removed.
+  void DestroyElementMaps();
+
+  Element* GetRootElementInternal() const;
   void DoNotifyPossibleTitleChange();
 
   void SetPageUnloadingEventTimeStamp()
@@ -4075,6 +4110,9 @@ protected:
   // A set of responsive images keyed by address pointer.
   nsTHashtable<nsPtrHashKey<mozilla::dom::HTMLImageElement>> mResponsiveContent;
 
+  // Array of owning references to all children
+  nsAttrAndChildArray mChildren;
+
 public:
   js::ExpandoAndGeneration mExpandoAndGeneration;