Bug 667883 - Implement nsAttrAndChildArray::SizeOf(). r=bz

content/base/public/Element.h

@@ -42,6 +42,7 @@
 
 #include "nsIContent.h"
 #include "nsEventStates.h"
+#include "nsDOMMemoryReporter.h"
 
 class nsEventStateManager;
 class nsGlobalWindow;
@@ -97,6 +98,8 @@ public:
   {}
 #endif // MOZILLA_INTERNAL_API
 
+  NS_DECL_AND_IMPL_DOM_MEMORY_REPORTER_SIZEOF(Element, nsIContent)
+
   /**
    * Method to get the full state of this element.  See nsEventStates.h for
    * the possible bits that could be set here.

content/base/src/nsAttrAndChildArray.cpp

@@ -847,3 +847,21 @@ nsAttrAndChildArray::SetChildAtPos(void** aPos, nsIContent* aChild,
     next->mPreviousSibling = aChild;
   }
 }
+
+PRInt64
+nsAttrAndChildArray::SizeOf() const
+{
+  PRInt64 size = sizeof(*this);
+
+  if (mImpl) {
+    // Don't add the size taken by *mMappedAttrs because it's shared.
+
+    // mBuffer cointains InternalAttr and nsIContent* (even if it's void**)
+    // so, we just have to compute the size of *mBuffer given that this object
+    // doesn't own the children list.
+    size += mImpl->mBufferSize * sizeof(*(mImpl->mBuffer)) + NS_IMPL_EXTRA_SIZE;
+  }
+
+  return size;
+}
+

content/base/src/nsAttrAndChildArray.h

@@ -131,6 +131,8 @@ public:
            !AttrSlotIsTaken(ATTRCHILD_ARRAY_MAX_ATTR_COUNT - 1);
   }
 
+  PRInt64 SizeOf() const;
+
 private:
   nsAttrAndChildArray(const nsAttrAndChildArray& aOther); // Not to be implemented
   nsAttrAndChildArray& operator=(const nsAttrAndChildArray& aOther); // Not to be implemented

content/base/src/nsGenericElement.cpp

@@ -146,6 +146,7 @@
 #include "prprf.h"
 
 #include "nsSVGFeatures.h"
+#include "nsDOMMemoryReporter.h"
 
 using namespace mozilla::dom;
 namespace css = mozilla::css;
@@ -5372,3 +5373,15 @@ nsNSElementTearoff::MozMatchesSelector(const nsAString& aSelector, PRBool* aRetu
 
   return rv;
 }
+
+PRInt64
+nsGenericElement::SizeOf() const
+{
+  PRInt64 size = MemoryReporter::GetBasicSize<nsGenericElement, Element>(this);
+
+  size -= sizeof(mAttrsAndChildren);
+  size += mAttrsAndChildren.SizeOf();
+
+  return size;
+}
+

content/base/src/nsGenericElement.h

@@ -240,6 +240,8 @@ public:
 
   NS_DECL_CYCLE_COLLECTING_ISUPPORTS
 
+  NS_DECL_DOM_MEMORY_REPORTER_SIZEOF
+
   /**
    * Called during QueryInterface to give the binding manager a chance to
    * get an interface for this element.