Bug 667474 - Do a naive computation of windows' size in the DOM Memory Reporter. r=jst

dom/base/nsDOMMemoryReporter.cpp

@@ -36,6 +36,7 @@
  * ***** END LICENSE BLOCK ***** */
 
 #include "nsDOMMemoryReporter.h"
+#include "nsGlobalWindow.h"
 
 
 nsDOMMemoryReporter::nsDOMMemoryReporter()
@@ -80,9 +81,23 @@ nsDOMMemoryReporter::GetDescription(char** aDescription)
   *aDescription = strdup("Memory used by the DOM.");
   return NS_OK;
 }
+
+static
+PLDHashOperator
+GetWindowsMemoryUsage(const PRUint64& aId, nsGlobalWindow*& aWindow,
+                      void* aClosure)
+{
+  *(PRInt64*)aClosure += aWindow->SizeOf();
+  return PL_DHASH_NEXT;
+}
+
 NS_IMETHODIMP
 nsDOMMemoryReporter::GetMemoryUsed(PRInt64* aMemoryUsed) {
   *aMemoryUsed = 0;
+
+  nsGlobalWindow::WindowByIdTable* windows = nsGlobalWindow::GetWindowsTable();
+  windows->Enumerate(GetWindowsMemoryUsage, aMemoryUsed);
+
   return NS_OK;
 }
 

dom/base/nsGlobalWindow.h

@@ -287,6 +287,7 @@ public:
 
   typedef mozilla::TimeStamp TimeStamp;
   typedef mozilla::TimeDuration TimeDuration;
+  typedef nsDataHashtable<nsUint64HashKey, nsGlobalWindow*> WindowByIdTable;
 
   // public methods
   nsPIDOMWindow* GetPrivateParent();
@@ -539,6 +540,14 @@ public:
 
   static bool HasPerformanceSupport();
 
+  static WindowByIdTable* GetWindowsTable() {
+    return sWindowsById;
+  }
+
+  PRInt64 SizeOf() const {
+    return sizeof(*this);
+  }
+
 private:
   // Enable updates for the accelerometer.
   void EnableDeviceMotionUpdates();
@@ -960,7 +969,6 @@ protected:
   friend class PostMessageEvent;
   static nsIDOMStorageList* sGlobalStorageList;
 
-  typedef nsDataHashtable<nsUint64HashKey, nsGlobalWindow*> WindowByIdTable;
   static WindowByIdTable* sWindowsById;
 };