The Tor Browser: dom/events/EventListenerManager.cpp@6474c204b198 (annotated)

dom/events/EventListenerManager.cpp@6474c204b198 (annotated)

dom/events/EventListenerManager.cpp

Wed, 31 Dec 2014 06:09:35 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:09:35 +0100
changeset 0: 6474c204b198
permissions: -rw-r--r--

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
 /* 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/. */
 // Microsoft's API Name hackery sucks
 #undef CreateEvent
 #include "mozilla/BasicEvents.h"
 #include "mozilla/EventDispatcher.h"
 #include "mozilla/EventListenerManager.h"
 #ifdef MOZ_B2G
 #include "mozilla/Hal.h"
 #endif // #ifdef MOZ_B2G
 #include "mozilla/HalSensor.h"
 #include "mozilla/InternalMutationEvent.h"
 #include "mozilla/JSEventHandler.h"
 #include "mozilla/MemoryReporting.h"
 #include "mozilla/dom/BindingUtils.h"
 #include "mozilla/dom/Element.h"
 #include "mozilla/dom/Event.h"
 #include "EventListenerService.h"
 #include "nsCOMArray.h"
 #include "nsCOMPtr.h"
 #include "nsContentUtils.h"
 #include "nsDOMCID.h"
 #include "nsError.h"
 #include "nsGkAtoms.h"
 #include "nsIContent.h"
 #include "nsIContentSecurityPolicy.h"
 #include "nsIDocument.h"
 #include "nsIDOMEventListener.h"
 #include "nsIScriptGlobalObject.h"
 #include "nsISupports.h"
 #include "nsIXPConnect.h"
 #include "nsJSUtils.h"
 #include "nsNameSpaceManager.h"
 #include "nsPIDOMWindow.h"
 #include "nsSandboxFlags.h"
 #include "xpcpublic.h"
 namespace mozilla {
 using namespace dom;
 using namespace hal;
 #define EVENT_TYPE_EQUALS(ls, type, userType, typeString, allEvents) \
   ((ls->mEventType == type &&                                        \
     (ls->mEventType != NS_USER_DEFINED_EVENT ||                      \
     (mIsMainThreadELM && ls->mTypeAtom == userType) ||               \
     (!mIsMainThreadELM && ls->mTypeString.Equals(typeString)))) ||   \
    (allEvents && ls->mAllEvents))
 static const uint32_t kAllMutationBits =
   NS_EVENT_BITS_MUTATION_SUBTREEMODIFIED |
   NS_EVENT_BITS_MUTATION_NODEINSERTED |
   NS_EVENT_BITS_MUTATION_NODEREMOVED |
   NS_EVENT_BITS_MUTATION_NODEREMOVEDFROMDOCUMENT |
   NS_EVENT_BITS_MUTATION_NODEINSERTEDINTODOCUMENT |
   NS_EVENT_BITS_MUTATION_ATTRMODIFIED |
   NS_EVENT_BITS_MUTATION_CHARACTERDATAMODIFIED;
 static uint32_t
 MutationBitForEventType(uint32_t aEventType)
 {
   switch (aEventType) {
     case NS_MUTATION_SUBTREEMODIFIED:
       return NS_EVENT_BITS_MUTATION_SUBTREEMODIFIED;
     case NS_MUTATION_NODEINSERTED:
       return NS_EVENT_BITS_MUTATION_NODEINSERTED;
     case NS_MUTATION_NODEREMOVED:
       return NS_EVENT_BITS_MUTATION_NODEREMOVED;
     case NS_MUTATION_NODEREMOVEDFROMDOCUMENT:
       return NS_EVENT_BITS_MUTATION_NODEREMOVEDFROMDOCUMENT;
     case NS_MUTATION_NODEINSERTEDINTODOCUMENT:
       return NS_EVENT_BITS_MUTATION_NODEINSERTEDINTODOCUMENT;
     case NS_MUTATION_ATTRMODIFIED:
       return NS_EVENT_BITS_MUTATION_ATTRMODIFIED;
     case NS_MUTATION_CHARACTERDATAMODIFIED:
       return NS_EVENT_BITS_MUTATION_CHARACTERDATAMODIFIED;
     default:
       break;
   }
   return 0;
 }
 uint32_t EventListenerManager::sMainThreadCreatedCount = 0;
 EventListenerManager::EventListenerManager(EventTarget* aTarget)
   : mMayHavePaintEventListener(false)
   , mMayHaveMutationListeners(false)
   , mMayHaveCapturingListeners(false)
   , mMayHaveSystemGroupListeners(false)
   , mMayHaveTouchEventListener(false)
   , mMayHaveMouseEnterLeaveEventListener(false)
   , mMayHavePointerEnterLeaveEventListener(false)
   , mClearingListeners(false)
   , mIsMainThreadELM(NS_IsMainThread())
   , mNoListenerForEvent(0)
   , mTarget(aTarget)
 {
   NS_ASSERTION(aTarget, "unexpected null pointer");
   if (mIsMainThreadELM) {
     ++sMainThreadCreatedCount;
   }
 }
 EventListenerManager::~EventListenerManager()
 {
   // If your code fails this assertion, a possible reason is that
   // a class did not call our Disconnect() manually. Note that
   // this class can have Disconnect called in one of two ways:
   // if it is part of a cycle, then in Unlink() (such a cycle
   // would be with one of the listeners, not mTarget which is weak).
   // If not part of a cycle, then Disconnect must be called manually,
   // typically from the destructor of the owner class (mTarget).
   // XXX azakai: Is there any reason to not just call Disconnect
   //             from right here, if not previously called?
   NS_ASSERTION(!mTarget, "didn't call Disconnect");
   RemoveAllListeners();
 }
 void
 EventListenerManager::RemoveAllListeners()
 {
   if (mClearingListeners) {
     return;
   }
   mClearingListeners = true;
   mListeners.Clear();
   mClearingListeners = false;
 }
 void
 EventListenerManager::Shutdown()
 {
   Event::Shutdown();
 }
 NS_IMPL_CYCLE_COLLECTION_ROOT_NATIVE(EventListenerManager, AddRef)
 NS_IMPL_CYCLE_COLLECTION_UNROOT_NATIVE(EventListenerManager, Release)
 inline void
 ImplCycleCollectionTraverse(nsCycleCollectionTraversalCallback& aCallback,
                             EventListenerManager::Listener& aField,
                             const char* aName,
                             unsigned aFlags)
 {
   if (MOZ_UNLIKELY(aCallback.WantDebugInfo())) {
     nsAutoCString name;
     name.AppendASCII(aName);
     if (aField.mTypeAtom) {
       name.AppendASCII(" event=");
       name.Append(nsAtomCString(aField.mTypeAtom));
       name.AppendASCII(" listenerType=");
       name.AppendInt(aField.mListenerType);
       name.AppendASCII(" ");
     }
     CycleCollectionNoteChild(aCallback, aField.mListener.GetISupports(), name.get(),
                              aFlags);
   } else {
     CycleCollectionNoteChild(aCallback, aField.mListener.GetISupports(), aName,
                              aFlags);
   }
 }
 NS_IMPL_CYCLE_COLLECTION_CLASS(EventListenerManager)
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(EventListenerManager)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mListeners)
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
 NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(EventListenerManager)
   tmp->Disconnect();
 NS_IMPL_CYCLE_COLLECTION_UNLINK_END
 nsPIDOMWindow*
 EventListenerManager::GetInnerWindowForTarget()
 {
   nsCOMPtr<nsINode> node = do_QueryInterface(mTarget);
   if (node) {
     // XXX sXBL/XBL2 issue -- do we really want the owner here?  What
     // if that's the XBL document?
     return node->OwnerDoc()->GetInnerWindow();
   }
   nsCOMPtr<nsPIDOMWindow> window = GetTargetAsInnerWindow();
   return window;
 }
 already_AddRefed<nsPIDOMWindow>
 EventListenerManager::GetTargetAsInnerWindow() const
 {
   nsCOMPtr<nsPIDOMWindow> window = do_QueryInterface(mTarget);
   if (!window) {
     return nullptr;
   }
   NS_ASSERTION(window->IsInnerWindow(), "Target should not be an outer window");
   return window.forget();
 }
 void
 EventListenerManager::AddEventListenerInternal(
                         const EventListenerHolder& aListenerHolder,
                         uint32_t aType,
                         nsIAtom* aTypeAtom,
                         const nsAString& aTypeString,
                         const EventListenerFlags& aFlags,
                         bool aHandler,
                         bool aAllEvents)
 {
   MOZ_ASSERT((NS_IsMainThread() && aType && aTypeAtom) || // Main thread
              (!NS_IsMainThread() && aType && !aTypeString.IsEmpty()) || // non-main-thread
              aAllEvents, "Missing type"); // all-events listener
   if (!aListenerHolder || mClearingListeners) {
     return;
   }
   // Since there is no public API to call us with an EventListenerHolder, we
   // know that there's an EventListenerHolder on the stack holding a strong ref
   // to the listener.
   Listener* listener;
   uint32_t count = mListeners.Length();
   for (uint32_t i = 0; i < count; i++) {
     listener = &mListeners.ElementAt(i);
     // mListener == aListenerHolder is the last one, since it can be a bit slow.
     if (listener->mListenerIsHandler == aHandler &&
         listener->mFlags == aFlags &&
         EVENT_TYPE_EQUALS(listener, aType, aTypeAtom, aTypeString,
                           aAllEvents) &&
         listener->mListener == aListenerHolder) {
       return;
     }
   }
   mNoListenerForEvent = NS_EVENT_NULL;
   mNoListenerForEventAtom = nullptr;
   listener = aAllEvents ? mListeners.InsertElementAt(0) :
                           mListeners.AppendElement();
   listener->mListener = aListenerHolder;
   MOZ_ASSERT(aType < PR_UINT16_MAX);
   listener->mEventType = aType;
   listener->mTypeString = aTypeString;
   listener->mTypeAtom = aTypeAtom;
   listener->mFlags = aFlags;
   listener->mListenerIsHandler = aHandler;
   listener->mHandlerIsString = false;
   listener->mAllEvents = aAllEvents;
   // Detect the type of event listener.
   nsCOMPtr<nsIXPConnectWrappedJS> wjs;
   if (aFlags.mListenerIsJSListener) {
     MOZ_ASSERT(!aListenerHolder.HasWebIDLCallback());
     listener->mListenerType = Listener::eJSEventListener;
   } else if (aListenerHolder.HasWebIDLCallback()) {
     listener->mListenerType = Listener::eWebIDLListener;
   } else if ((wjs = do_QueryInterface(aListenerHolder.GetXPCOMCallback()))) {
     listener->mListenerType = Listener::eWrappedJSListener;
   } else {
     listener->mListenerType = Listener::eNativeListener;
   }
   if (aFlags.mInSystemGroup) {
     mMayHaveSystemGroupListeners = true;
   }
   if (aFlags.mCapture) {
     mMayHaveCapturingListeners = true;
   }
   if (aType == NS_AFTERPAINT) {
     mMayHavePaintEventListener = true;
     nsPIDOMWindow* window = GetInnerWindowForTarget();
     if (window) {
       window->SetHasPaintEventListeners();
     }
   } else if (aType >= NS_MUTATION_START && aType <= NS_MUTATION_END) {
     // For mutation listeners, we need to update the global bit on the DOM window.
     // Otherwise we won't actually fire the mutation event.
     mMayHaveMutationListeners = true;
     // Go from our target to the nearest enclosing DOM window.
     nsPIDOMWindow* window = GetInnerWindowForTarget();
     if (window) {
       nsCOMPtr<nsIDocument> doc = window->GetExtantDoc();
       if (doc) {
         doc->WarnOnceAbout(nsIDocument::eMutationEvent);
       }
       // If aType is NS_MUTATION_SUBTREEMODIFIED, we need to listen all
       // mutations. nsContentUtils::HasMutationListeners relies on this.
       window->SetMutationListeners((aType == NS_MUTATION_SUBTREEMODIFIED) ?
                                    kAllMutationBits :
                                    MutationBitForEventType(aType));
     }
   } else if (aTypeAtom == nsGkAtoms::ondeviceorientation) {
     EnableDevice(NS_DEVICE_ORIENTATION);
   } else if (aTypeAtom == nsGkAtoms::ondeviceproximity || aTypeAtom == nsGkAtoms::onuserproximity) {
     EnableDevice(NS_DEVICE_PROXIMITY);
   } else if (aTypeAtom == nsGkAtoms::ondevicelight) {
     EnableDevice(NS_DEVICE_LIGHT);
   } else if (aTypeAtom == nsGkAtoms::ondevicemotion) {
     EnableDevice(NS_DEVICE_MOTION);
 #ifdef MOZ_B2G
   } else if (aTypeAtom == nsGkAtoms::onmoztimechange) {
     nsCOMPtr<nsPIDOMWindow> window = GetTargetAsInnerWindow();
     if (window) {
       window->EnableTimeChangeNotifications();
     }
   } else if (aTypeAtom == nsGkAtoms::onmoznetworkupload) {
     nsCOMPtr<nsPIDOMWindow> window = GetTargetAsInnerWindow();
     if (window) {
       window->EnableNetworkEvent(NS_NETWORK_UPLOAD_EVENT);
     }
   } else if (aTypeAtom == nsGkAtoms::onmoznetworkdownload) {
     nsCOMPtr<nsPIDOMWindow> window = GetTargetAsInnerWindow();
     if (window) {
       window->EnableNetworkEvent(NS_NETWORK_DOWNLOAD_EVENT);
     }
 #endif // MOZ_B2G
   } else if (aTypeAtom == nsGkAtoms::ontouchstart ||
              aTypeAtom == nsGkAtoms::ontouchend ||
              aTypeAtom == nsGkAtoms::ontouchmove ||
              aTypeAtom == nsGkAtoms::ontouchenter ||
              aTypeAtom == nsGkAtoms::ontouchleave ||
              aTypeAtom == nsGkAtoms::ontouchcancel) {
     mMayHaveTouchEventListener = true;
     nsPIDOMWindow* window = GetInnerWindowForTarget();
     // we don't want touchevent listeners added by scrollbars to flip this flag
     // so we ignore listeners created with system event flag
     if (window && !aFlags.mInSystemGroup) {
       window->SetHasTouchEventListeners();
     }
   } else if (aType >= NS_POINTER_EVENT_START && aType <= NS_POINTER_LOST_CAPTURE) {
     nsPIDOMWindow* window = GetInnerWindowForTarget();
     if (aTypeAtom == nsGkAtoms::onpointerenter ||
         aTypeAtom == nsGkAtoms::onpointerleave) {
       mMayHavePointerEnterLeaveEventListener = true;
       if (window) {
 #ifdef DEBUG
         nsCOMPtr<nsIDocument> d = window->GetExtantDoc();
         NS_WARN_IF_FALSE(!nsContentUtils::IsChromeDoc(d),
                          "Please do not use pointerenter/leave events in chrome. "
                          "They are slower than pointerover/out!");
 #endif
         window->SetHasPointerEnterLeaveEventListeners();
       }
     }
   } else if (aTypeAtom == nsGkAtoms::onmouseenter ||
              aTypeAtom == nsGkAtoms::onmouseleave) {
     mMayHaveMouseEnterLeaveEventListener = true;
     nsPIDOMWindow* window = GetInnerWindowForTarget();
     if (window) {
 #ifdef DEBUG
       nsCOMPtr<nsIDocument> d = window->GetExtantDoc();
       NS_WARN_IF_FALSE(!nsContentUtils::IsChromeDoc(d),
                        "Please do not use mouseenter/leave events in chrome. "
                        "They are slower than mouseover/out!");
 #endif
       window->SetHasMouseEnterLeaveEventListeners();
     }
 #ifdef MOZ_GAMEPAD
   } else if (aType >= NS_GAMEPAD_START &&
              aType <= NS_GAMEPAD_END) {
     nsPIDOMWindow* window = GetInnerWindowForTarget();
     if (window) {
       window->SetHasGamepadEventListener();
     }
 #endif
   }
   if (aTypeAtom && mTarget) {
     mTarget->EventListenerAdded(aTypeAtom);
   }
 }
 bool
 EventListenerManager::IsDeviceType(uint32_t aType)
 {
   switch (aType) {
     case NS_DEVICE_ORIENTATION:
     case NS_DEVICE_MOTION:
     case NS_DEVICE_LIGHT:
     case NS_DEVICE_PROXIMITY:
     case NS_USER_PROXIMITY:
       return true;
     default:
       break;
   }
   return false;
 }
 void
 EventListenerManager::EnableDevice(uint32_t aType)
 {
   nsCOMPtr<nsPIDOMWindow> window = GetTargetAsInnerWindow();
   if (!window) {
     return;
   }
   switch (aType) {
     case NS_DEVICE_ORIENTATION:
       window->EnableDeviceSensor(SENSOR_ORIENTATION);
       break;
     case NS_DEVICE_PROXIMITY:
     case NS_USER_PROXIMITY:
       window->EnableDeviceSensor(SENSOR_PROXIMITY);
       break;
     case NS_DEVICE_LIGHT:
       window->EnableDeviceSensor(SENSOR_LIGHT);
       break;
     case NS_DEVICE_MOTION:
       window->EnableDeviceSensor(SENSOR_ACCELERATION);
       window->EnableDeviceSensor(SENSOR_LINEAR_ACCELERATION);
       window->EnableDeviceSensor(SENSOR_GYROSCOPE);
       break;
     default:
       NS_WARNING("Enabling an unknown device sensor.");
       break;
   }
 }
 void
 EventListenerManager::DisableDevice(uint32_t aType)
 {
   nsCOMPtr<nsPIDOMWindow> window = GetTargetAsInnerWindow();
   if (!window) {
     return;
   }
   switch (aType) {
     case NS_DEVICE_ORIENTATION:
       window->DisableDeviceSensor(SENSOR_ORIENTATION);
       break;
     case NS_DEVICE_MOTION:
       window->DisableDeviceSensor(SENSOR_ACCELERATION);
       window->DisableDeviceSensor(SENSOR_LINEAR_ACCELERATION);
       window->DisableDeviceSensor(SENSOR_GYROSCOPE);
       break;
     case NS_DEVICE_PROXIMITY:
     case NS_USER_PROXIMITY:
       window->DisableDeviceSensor(SENSOR_PROXIMITY);
       break;
     case NS_DEVICE_LIGHT:
       window->DisableDeviceSensor(SENSOR_LIGHT);
       break;
     default:
       NS_WARNING("Disabling an unknown device sensor.");
       break;
   }
 }
 void
 EventListenerManager::RemoveEventListenerInternal(
                         const EventListenerHolder& aListenerHolder,
                         uint32_t aType,
                         nsIAtom* aUserType,
                         const nsAString& aTypeString,
                         const EventListenerFlags& aFlags,
                         bool aAllEvents)
 {
   if (!aListenerHolder || !aType || mClearingListeners) {
     return;
   }
   Listener* listener;
   uint32_t count = mListeners.Length();
   uint32_t typeCount = 0;
   bool deviceType = IsDeviceType(aType);
 #ifdef MOZ_B2G
   bool timeChangeEvent = (aType == NS_MOZ_TIME_CHANGE_EVENT);
   bool networkEvent = (aType == NS_NETWORK_UPLOAD_EVENT ||
                        aType == NS_NETWORK_DOWNLOAD_EVENT);
 #endif // MOZ_B2G
   for (uint32_t i = 0; i < count; ++i) {
     listener = &mListeners.ElementAt(i);
     if (EVENT_TYPE_EQUALS(listener, aType, aUserType, aTypeString,
                           aAllEvents)) {
       ++typeCount;
       if (listener->mListener == aListenerHolder &&
           listener->mFlags.EqualsIgnoringTrustness(aFlags)) {
         nsRefPtr<EventListenerManager> kungFuDeathGrip(this);
         mListeners.RemoveElementAt(i);
         --count;
         mNoListenerForEvent = NS_EVENT_NULL;
         mNoListenerForEventAtom = nullptr;
         if (mTarget && aUserType) {
           mTarget->EventListenerRemoved(aUserType);
         }
         if (!deviceType
 #ifdef MOZ_B2G
             && !timeChangeEvent && !networkEvent
 #endif // MOZ_B2G
             ) {
           return;
         }
         --typeCount;
       }
     }
   }
   if (!aAllEvents && deviceType && typeCount == 0) {
     DisableDevice(aType);
 #ifdef MOZ_B2G
   } else if (timeChangeEvent && typeCount == 0) {
     nsCOMPtr<nsPIDOMWindow> window = GetTargetAsInnerWindow();
     if (window) {
       window->DisableTimeChangeNotifications();
     }
   } else if (!aAllEvents && networkEvent && typeCount == 0) {
     nsCOMPtr<nsPIDOMWindow> window = GetTargetAsInnerWindow();
     if (window) {
       window->DisableNetworkEvent(aType);
     }
 #endif // MOZ_B2G
   }
 }
 bool
 EventListenerManager::ListenerCanHandle(Listener* aListener,
                                         WidgetEvent* aEvent)
 {
   // This is slightly different from EVENT_TYPE_EQUALS in that it returns
   // true even when aEvent->message == NS_USER_DEFINED_EVENT and
   // aListener=>mEventType != NS_USER_DEFINED_EVENT as long as the atoms are
   // the same
   if (aListener->mAllEvents) {
     return true;
   }
   if (aEvent->message == NS_USER_DEFINED_EVENT) {
     if (mIsMainThreadELM) {
       return aListener->mTypeAtom == aEvent->userType;
     }
     return aListener->mTypeString.Equals(aEvent->typeString);
   }
   MOZ_ASSERT(mIsMainThreadELM);
   return aListener->mEventType == aEvent->message;
 }
 void
 EventListenerManager::AddEventListenerByType(
                         const EventListenerHolder& aListenerHolder,
                         const nsAString& aType,
                         const EventListenerFlags& aFlags)
 {
   nsCOMPtr<nsIAtom> atom =
     mIsMainThreadELM ? do_GetAtom(NS_LITERAL_STRING("on") + aType) : nullptr;
   uint32_t type = nsContentUtils::GetEventId(atom);
   AddEventListenerInternal(aListenerHolder, type, atom, aType, aFlags);
 }
 void
 EventListenerManager::RemoveEventListenerByType(
                         const EventListenerHolder& aListenerHolder,
                         const nsAString& aType,
                         const EventListenerFlags& aFlags)
 {
   nsCOMPtr<nsIAtom> atom =
     mIsMainThreadELM ? do_GetAtom(NS_LITERAL_STRING("on") + aType) : nullptr;
   uint32_t type = nsContentUtils::GetEventId(atom);
   RemoveEventListenerInternal(aListenerHolder, type, atom, aType, aFlags);
 }
 EventListenerManager::Listener*
 EventListenerManager::FindEventHandler(uint32_t aEventType,
                                        nsIAtom* aTypeAtom,
                                        const nsAString& aTypeString)
 {
   // Run through the listeners for this type and see if a script
   // listener is registered
   Listener* listener;
   uint32_t count = mListeners.Length();
   for (uint32_t i = 0; i < count; ++i) {
     listener = &mListeners.ElementAt(i);
     if (listener->mListenerIsHandler &&
         EVENT_TYPE_EQUALS(listener, aEventType, aTypeAtom, aTypeString,
                           false)) {
       return listener;
     }
   }
   return nullptr;
 }
 EventListenerManager::Listener*
 EventListenerManager::SetEventHandlerInternal(
                         nsIAtom* aName,
                         const nsAString& aTypeString,
                         const TypedEventHandler& aTypedHandler,
                         bool aPermitUntrustedEvents)
 {
   MOZ_ASSERT(aName || !aTypeString.IsEmpty());
   uint32_t eventType = nsContentUtils::GetEventId(aName);
   Listener* listener = FindEventHandler(eventType, aName, aTypeString);
   if (!listener) {
     // If we didn't find a script listener or no listeners existed
     // create and add a new one.
     EventListenerFlags flags;
     flags.mListenerIsJSListener = true;
     nsCOMPtr<JSEventHandler> jsEventHandler;
     NS_NewJSEventHandler(mTarget, aName,
                          aTypedHandler, getter_AddRefs(jsEventHandler));
     EventListenerHolder listenerHolder(jsEventHandler);
     AddEventListenerInternal(listenerHolder, eventType, aName, aTypeString,
                              flags, true);
     listener = FindEventHandler(eventType, aName, aTypeString);
   } else {
     JSEventHandler* jsEventHandler = listener->GetJSEventHandler();
     MOZ_ASSERT(jsEventHandler,
                "How can we have an event handler with no JSEventHandler?");
     bool same = jsEventHandler->GetTypedEventHandler() == aTypedHandler;
     // Possibly the same listener, but update still the context and scope.
     jsEventHandler->SetHandler(aTypedHandler);
     if (mTarget && !same && aName) {
       mTarget->EventListenerRemoved(aName);
       mTarget->EventListenerAdded(aName);
     }
   }
   // Set flag to indicate possible need for compilation later
   listener->mHandlerIsString = !aTypedHandler.HasEventHandler();
   if (aPermitUntrustedEvents) {
     listener->mFlags.mAllowUntrustedEvents = true;
   }
   return listener;
 }
 nsresult
 EventListenerManager::SetEventHandler(nsIAtom* aName,
                                       const nsAString& aBody,
                                       uint32_t aLanguage,
                                       bool aDeferCompilation,
                                       bool aPermitUntrustedEvents,
                                       Element* aElement)
 {
   NS_PRECONDITION(aLanguage != nsIProgrammingLanguage::UNKNOWN,
                   "Must know the language for the script event listener");
   // |aPermitUntrustedEvents| is set to False for chrome - events
   // *generated* from an unknown source are not allowed.
   // However, for script languages with no 'sandbox', we want to reject
   // such scripts based on the source of their code, not just the source
   // of the event.
   if (aPermitUntrustedEvents &&
       aLanguage != nsIProgrammingLanguage::JAVASCRIPT) {
     NS_WARNING("Discarding non-JS event listener from untrusted source");
     return NS_ERROR_FAILURE;
   }
   nsCOMPtr<nsIDocument> doc;
   nsCOMPtr<nsIScriptGlobalObject> global =
     GetScriptGlobalAndDocument(getter_AddRefs(doc));
   if (!global) {
     // This can happen; for example this document might have been
     // loaded as data.
     return NS_OK;
   }
 #ifdef DEBUG
   nsCOMPtr<nsPIDOMWindow> win = do_QueryInterface(global);
   if (win) {
     MOZ_ASSERT(win->IsInnerWindow(), "We should not have an outer window here!");
   }
 #endif
   nsresult rv = NS_OK;
   // return early preventing the event listener from being added
   // 'doc' is fetched above
   if (doc) {
     // Don't allow adding an event listener if the document is sandboxed
     // without 'allow-scripts'.
     if (doc->GetSandboxFlags() & SANDBOXED_SCRIPTS) {
       return NS_ERROR_DOM_SECURITY_ERR;
     }
     nsCOMPtr<nsIContentSecurityPolicy> csp;
     rv = doc->NodePrincipal()->GetCsp(getter_AddRefs(csp));
     NS_ENSURE_SUCCESS(rv, rv);
     if (csp) {
       bool inlineOK = true;
       bool reportViolations = false;
       rv = csp->GetAllowsInlineScript(&reportViolations, &inlineOK);
       NS_ENSURE_SUCCESS(rv, rv);
       if (reportViolations) {
         // gather information to log with violation report
         nsIURI* uri = doc->GetDocumentURI();
         nsAutoCString asciiSpec;
         if (uri)
           uri->GetAsciiSpec(asciiSpec);
         nsAutoString scriptSample, attr, tagName(NS_LITERAL_STRING("UNKNOWN"));
         aName->ToString(attr);
         nsCOMPtr<nsIDOMNode> domNode(do_QueryInterface(mTarget));
         if (domNode)
           domNode->GetNodeName(tagName);
         // build a "script sample" based on what we know about this element
         scriptSample.Assign(attr);
         scriptSample.AppendLiteral(" attribute on ");
         scriptSample.Append(tagName);
         scriptSample.AppendLiteral(" element");
         csp->LogViolationDetails(nsIContentSecurityPolicy::VIOLATION_TYPE_INLINE_SCRIPT,
                                  NS_ConvertUTF8toUTF16(asciiSpec),
                                  scriptSample,
 ,
                                  EmptyString(),
                                  EmptyString());
       }
       // return early if CSP wants us to block inline scripts
       if (!inlineOK) {
         return NS_OK;
       }
     }
   }
   // This might be the first reference to this language in the global
   // We must init the language before we attempt to fetch its context.
   if (NS_FAILED(global->EnsureScriptEnvironment())) {
     NS_WARNING("Failed to setup script environment for this language");
     // but fall through and let the inevitable failure below handle it.
   }
   nsIScriptContext* context = global->GetScriptContext();
   NS_ENSURE_TRUE(context, NS_ERROR_FAILURE);
   NS_ENSURE_STATE(global->GetGlobalJSObject());
   Listener* listener = SetEventHandlerInternal(aName,
                                                EmptyString(),
                                                TypedEventHandler(),
                                                aPermitUntrustedEvents);
   if (!aDeferCompilation) {
     return CompileEventHandlerInternal(listener, &aBody, aElement);
   }
   return NS_OK;
 }
 void
 EventListenerManager::RemoveEventHandler(nsIAtom* aName,
                                          const nsAString& aTypeString)
 {
   if (mClearingListeners) {
     return;
   }
   uint32_t eventType = nsContentUtils::GetEventId(aName);
   Listener* listener = FindEventHandler(eventType, aName, aTypeString);
   if (listener) {
     mListeners.RemoveElementAt(uint32_t(listener - &mListeners.ElementAt(0)));
     mNoListenerForEvent = NS_EVENT_NULL;
     mNoListenerForEventAtom = nullptr;
     if (mTarget && aName) {
       mTarget->EventListenerRemoved(aName);
     }
   }
 }
 nsresult
 EventListenerManager::CompileEventHandlerInternal(Listener* aListener,
                                                   const nsAString* aBody,
                                                   Element* aElement)
 {
   MOZ_ASSERT(aListener->GetJSEventHandler());
   MOZ_ASSERT(aListener->mHandlerIsString, "Why are we compiling a non-string JS listener?");
   JSEventHandler* jsEventHandler = aListener->GetJSEventHandler();
   MOZ_ASSERT(!jsEventHandler->GetTypedEventHandler().HasEventHandler(),
              "What is there to compile?");
   nsresult result = NS_OK;
   nsCOMPtr<nsIDocument> doc;
   nsCOMPtr<nsIScriptGlobalObject> global =
     GetScriptGlobalAndDocument(getter_AddRefs(doc));
   NS_ENSURE_STATE(global);
   nsIScriptContext* context = global->GetScriptContext();
   NS_ENSURE_STATE(context);
   // Activate JSAPI, and make sure that exceptions are reported on the right
   // Window.
   AutoJSAPIWithErrorsReportedToWindow jsapi(context);
   JSContext* cx = jsapi.cx();
   nsCOMPtr<nsIAtom> typeAtom = aListener->mTypeAtom;
   nsIAtom* attrName = typeAtom;
   // Flag us as not a string so we don't keep trying to compile strings which
   // can't be compiled.
   aListener->mHandlerIsString = false;
   // mTarget may not be an Element if it's a window and we're
   // getting an inline event listener forwarded from <html:body> or
   // <html:frameset> or <xul:window> or the like.
   // XXX I don't like that we have to reference content from
   // here. The alternative is to store the event handler string on
   // the JSEventHandler itself, and that still doesn't address
   // the arg names issue.
   nsCOMPtr<Element> element = do_QueryInterface(mTarget);
   MOZ_ASSERT(element || aBody, "Where will we get our body?");
   nsAutoString handlerBody;
   const nsAString* body = aBody;
   if (!aBody) {
     if (aListener->mTypeAtom == nsGkAtoms::onSVGLoad) {
       attrName = nsGkAtoms::onload;
     } else if (aListener->mTypeAtom == nsGkAtoms::onSVGUnload) {
       attrName = nsGkAtoms::onunload;
     } else if (aListener->mTypeAtom == nsGkAtoms::onSVGResize) {
       attrName = nsGkAtoms::onresize;
     } else if (aListener->mTypeAtom == nsGkAtoms::onSVGScroll) {
       attrName = nsGkAtoms::onscroll;
     } else if (aListener->mTypeAtom == nsGkAtoms::onSVGZoom) {
       attrName = nsGkAtoms::onzoom;
     } else if (aListener->mTypeAtom == nsGkAtoms::onbeginEvent) {
       attrName = nsGkAtoms::onbegin;
     } else if (aListener->mTypeAtom == nsGkAtoms::onrepeatEvent) {
       attrName = nsGkAtoms::onrepeat;
     } else if (aListener->mTypeAtom == nsGkAtoms::onendEvent) {
       attrName = nsGkAtoms::onend;
     }
     element->GetAttr(kNameSpaceID_None, attrName, handlerBody);
     body = &handlerBody;
     aElement = element;
   }
   aListener = nullptr;
   uint32_t lineNo = 0;
   nsAutoCString url (NS_LITERAL_CSTRING("-moz-evil:lying-event-listener"));
   MOZ_ASSERT(body);
   MOZ_ASSERT(aElement);
   nsIURI *uri = aElement->OwnerDoc()->GetDocumentURI();
   if (uri) {
     uri->GetSpec(url);
     lineNo = 1;
   }
   uint32_t argCount;
   const char **argNames;
   nsContentUtils::GetEventArgNames(aElement->GetNameSpaceID(),
                                    typeAtom,
                                    &argCount, &argNames);
   // Wrap the event target, so that we can use it as the scope for the event
   // handler. Note that mTarget is different from aElement in the <body> case,
   // where mTarget is a Window.
   //
   // The wrapScope doesn't really matter here, because the target will create
   // its reflector in the proper scope, and then we'll enter that compartment.
   JS::Rooted<JSObject*> wrapScope(cx, context->GetWindowProxy());
   JS::Rooted<JS::Value> v(cx);
   {
     JSAutoCompartment ac(cx, wrapScope);
     nsresult rv = nsContentUtils::WrapNative(cx, mTarget, &v,
                                              /* aAllowWrapping = */ false);
     if (NS_WARN_IF(NS_FAILED(rv))) {
       return rv;
     }
   }
   JS::Rooted<JSObject*> target(cx, &v.toObject());
   JSAutoCompartment ac(cx, target);
   nsDependentAtomString str(attrName);
   // Most of our names are short enough that we don't even have to malloc
   // the JS string stuff, so don't worry about playing games with
   // refcounting XPCOM stringbuffers.
   JS::Rooted<JSString*> jsStr(cx, JS_NewUCStringCopyN(cx,
                                                       str.BeginReading(),
                                                       str.Length()));
   NS_ENSURE_TRUE(jsStr, NS_ERROR_OUT_OF_MEMORY);
   // Get the reflector for |aElement|, so that we can pass to setElement.
   if (NS_WARN_IF(!WrapNewBindingObject(cx, target, aElement, &v))) {
     return NS_ERROR_FAILURE;
   }
   JS::CompileOptions options(cx);
   options.setIntroductionType("eventHandler")
          .setFileAndLine(url.get(), lineNo)
          .setVersion(SCRIPTVERSION_DEFAULT)
          .setElement(&v.toObject())
          .setElementAttributeName(jsStr)
          .setDefineOnScope(false);
   JS::Rooted<JSObject*> handler(cx);
   result = nsJSUtils::CompileFunction(cx, target, options,
                                       nsAtomCString(typeAtom),
                                       argCount, argNames, *body, handler.address());
   NS_ENSURE_SUCCESS(result, result);
   NS_ENSURE_TRUE(handler, NS_ERROR_FAILURE);
   nsCOMPtr<nsPIDOMWindow> win = do_QueryInterface(mTarget);
   if (jsEventHandler->EventName() == nsGkAtoms::onerror && win) {
     nsRefPtr<OnErrorEventHandlerNonNull> handlerCallback =
       new OnErrorEventHandlerNonNull(handler, /* aIncumbentGlobal = */ nullptr);
     jsEventHandler->SetHandler(handlerCallback);
   } else if (jsEventHandler->EventName() == nsGkAtoms::onbeforeunload && win) {
     nsRefPtr<OnBeforeUnloadEventHandlerNonNull> handlerCallback =
       new OnBeforeUnloadEventHandlerNonNull(handler, /* aIncumbentGlobal = */ nullptr);
     jsEventHandler->SetHandler(handlerCallback);
   } else {
     nsRefPtr<EventHandlerNonNull> handlerCallback =
       new EventHandlerNonNull(handler, /* aIncumbentGlobal = */ nullptr);
     jsEventHandler->SetHandler(handlerCallback);
   }
   return result;
 }
 nsresult
 EventListenerManager::HandleEventSubType(Listener* aListener,
                                          nsIDOMEvent* aDOMEvent,
                                          EventTarget* aCurrentTarget)
 {
   nsresult result = NS_OK;
   EventListenerHolder listenerHolder(aListener->mListener);  // strong ref
   // If this is a script handler and we haven't yet
   // compiled the event handler itself
   if ((aListener->mListenerType == Listener::eJSEventListener) &&
       aListener->mHandlerIsString) {
     result = CompileEventHandlerInternal(aListener, nullptr, nullptr);
     aListener = nullptr;
   }
   if (NS_SUCCEEDED(result)) {
     if (mIsMainThreadELM) {
       nsContentUtils::EnterMicroTask();
     }
     // nsIDOMEvent::currentTarget is set in EventDispatcher.
     if (listenerHolder.HasWebIDLCallback()) {
       ErrorResult rv;
       listenerHolder.GetWebIDLCallback()->
         HandleEvent(aCurrentTarget, *(aDOMEvent->InternalDOMEvent()), rv);
       result = rv.ErrorCode();
     } else {
       result = listenerHolder.GetXPCOMCallback()->HandleEvent(aDOMEvent);
     }
     if (mIsMainThreadELM) {
       nsContentUtils::LeaveMicroTask();
     }
   }
   return result;
 }
 /**
 * Causes a check for event listeners and processing by them if they exist.
 * @param an event listener
 */
 void
 EventListenerManager::HandleEventInternal(nsPresContext* aPresContext,
                                           WidgetEvent* aEvent,
                                           nsIDOMEvent** aDOMEvent,
                                           EventTarget* aCurrentTarget,
                                           nsEventStatus* aEventStatus)
 {
   //Set the value of the internal PreventDefault flag properly based on aEventStatus
   if (*aEventStatus == nsEventStatus_eConsumeNoDefault) {
     aEvent->mFlags.mDefaultPrevented = true;
   }
   nsAutoTObserverArray<Listener, 2>::EndLimitedIterator iter(mListeners);
   Maybe<nsAutoPopupStatePusher> popupStatePusher;
   if (mIsMainThreadELM) {
     popupStatePusher.construct(Event::GetEventPopupControlState(aEvent));
   }
   bool hasListener = false;
   while (iter.HasMore()) {
     if (aEvent->mFlags.mImmediatePropagationStopped) {
       break;
     }
     Listener* listener = &iter.GetNext();
     // Check that the phase is same in event and event listener.
     // Handle only trusted events, except when listener permits untrusted events.
     if (ListenerCanHandle(listener, aEvent)) {
       hasListener = true;
       if (listener->IsListening(aEvent) &&
           (aEvent->mFlags.mIsTrusted ||
            listener->mFlags.mAllowUntrustedEvents)) {
         if (!*aDOMEvent) {
           // This is tiny bit slow, but happens only once per event.
           nsCOMPtr<EventTarget> et =
             do_QueryInterface(aEvent->originalTarget);
           EventDispatcher::CreateEvent(et, aPresContext,
                                        aEvent, EmptyString(), aDOMEvent);
         }
         if (*aDOMEvent) {
           if (!aEvent->currentTarget) {
             aEvent->currentTarget = aCurrentTarget->GetTargetForDOMEvent();
             if (!aEvent->currentTarget) {
               break;
             }
           }
           if (NS_FAILED(HandleEventSubType(listener, *aDOMEvent,
                                            aCurrentTarget))) {
             aEvent->mFlags.mExceptionHasBeenRisen = true;
           }
         }
       }
     }
   }
   aEvent->currentTarget = nullptr;
   if (mIsMainThreadELM && !hasListener) {
     mNoListenerForEvent = aEvent->message;
     mNoListenerForEventAtom = aEvent->userType;
   }
   if (aEvent->mFlags.mDefaultPrevented) {
     *aEventStatus = nsEventStatus_eConsumeNoDefault;
   }
 }
 void
 EventListenerManager::Disconnect()
 {
   mTarget = nullptr;
   RemoveAllListeners();
 }
 void
 EventListenerManager::AddEventListener(
                         const nsAString& aType,
                         const EventListenerHolder& aListenerHolder,
                         bool aUseCapture,
                         bool aWantsUntrusted)
 {
   EventListenerFlags flags;
   flags.mCapture = aUseCapture;
   flags.mAllowUntrustedEvents = aWantsUntrusted;
   return AddEventListenerByType(aListenerHolder, aType, flags);
 }
 void
 EventListenerManager::RemoveEventListener(
                         const nsAString& aType,
                         const EventListenerHolder& aListenerHolder,
                         bool aUseCapture)
 {
   EventListenerFlags flags;
   flags.mCapture = aUseCapture;
   RemoveEventListenerByType(aListenerHolder, aType, flags);
 }
 void
 EventListenerManager::AddListenerForAllEvents(nsIDOMEventListener* aDOMListener,
                                               bool aUseCapture,
                                               bool aWantsUntrusted,
                                               bool aSystemEventGroup)
 {
   EventListenerFlags flags;
   flags.mCapture = aUseCapture;
   flags.mAllowUntrustedEvents = aWantsUntrusted;
   flags.mInSystemGroup = aSystemEventGroup;
   EventListenerHolder listenerHolder(aDOMListener);
   AddEventListenerInternal(listenerHolder, NS_EVENT_ALL, nullptr, EmptyString(),
                            flags, false, true);
 }
 void
 EventListenerManager::RemoveListenerForAllEvents(
                         nsIDOMEventListener* aDOMListener,
                         bool aUseCapture,
                         bool aSystemEventGroup)
 {
   EventListenerFlags flags;
   flags.mCapture = aUseCapture;
   flags.mInSystemGroup = aSystemEventGroup;
   EventListenerHolder listenerHolder(aDOMListener);
   RemoveEventListenerInternal(listenerHolder, NS_EVENT_ALL, nullptr,
                               EmptyString(), flags, true);
 }
 bool
 EventListenerManager::HasMutationListeners()
 {
   if (mMayHaveMutationListeners) {
     uint32_t count = mListeners.Length();
     for (uint32_t i = 0; i < count; ++i) {
       Listener* listener = &mListeners.ElementAt(i);
       if (listener->mEventType >= NS_MUTATION_START &&
           listener->mEventType <= NS_MUTATION_END) {
         return true;
       }
     }
   }
   return false;
 }
 uint32_t
 EventListenerManager::MutationListenerBits()
 {
   uint32_t bits = 0;
   if (mMayHaveMutationListeners) {
     uint32_t count = mListeners.Length();
     for (uint32_t i = 0; i < count; ++i) {
       Listener* listener = &mListeners.ElementAt(i);
       if (listener->mEventType >= NS_MUTATION_START &&
           listener->mEventType <= NS_MUTATION_END) {
         if (listener->mEventType == NS_MUTATION_SUBTREEMODIFIED) {
           return kAllMutationBits;
         }
         bits |= MutationBitForEventType(listener->mEventType);
       }
     }
   }
   return bits;
 }
 bool
 EventListenerManager::HasListenersFor(const nsAString& aEventName)
 {
   nsCOMPtr<nsIAtom> atom = do_GetAtom(NS_LITERAL_STRING("on") + aEventName);
   return HasListenersFor(atom);
 }
 bool
 EventListenerManager::HasListenersFor(nsIAtom* aEventNameWithOn)
 {
 #ifdef DEBUG
   nsAutoString name;
   aEventNameWithOn->ToString(name);
 #endif
   NS_ASSERTION(StringBeginsWith(name, NS_LITERAL_STRING("on")),
                "Event name does not start with 'on'");
   uint32_t count = mListeners.Length();
   for (uint32_t i = 0; i < count; ++i) {
     Listener* listener = &mListeners.ElementAt(i);
     if (listener->mTypeAtom == aEventNameWithOn) {
       return true;
     }
   }
   return false;
 }
 bool
 EventListenerManager::HasListeners()
 {
   return !mListeners.IsEmpty();
 }
 nsresult
 EventListenerManager::GetListenerInfo(nsCOMArray<nsIEventListenerInfo>* aList)
 {
   nsCOMPtr<EventTarget> target = do_QueryInterface(mTarget);
   NS_ENSURE_STATE(target);
   aList->Clear();
   uint32_t count = mListeners.Length();
   for (uint32_t i = 0; i < count; ++i) {
     const Listener& listener = mListeners.ElementAt(i);
     // If this is a script handler and we haven't yet
     // compiled the event handler itself go ahead and compile it
     if (listener.mListenerType == Listener::eJSEventListener &&
         listener.mHandlerIsString) {
       CompileEventHandlerInternal(const_cast<Listener*>(&listener), nullptr,
                                   nullptr);
     }
     nsAutoString eventType;
     if (listener.mAllEvents) {
       eventType.SetIsVoid(true);
     } else {
       eventType.Assign(Substring(nsDependentAtomString(listener.mTypeAtom), 2));
     }
     // EventListenerInfo is defined in XPCOM, so we have to go ahead
     // and convert to an XPCOM callback here...
     nsRefPtr<EventListenerInfo> info =
       new EventListenerInfo(eventType, listener.mListener.ToXPCOMCallback(),
                             listener.mFlags.mCapture,
                             listener.mFlags.mAllowUntrustedEvents,
                             listener.mFlags.mInSystemGroup);
     aList->AppendObject(info);
   }
   return NS_OK;
 }
 bool
 EventListenerManager::HasUnloadListeners()
 {
   uint32_t count = mListeners.Length();
   for (uint32_t i = 0; i < count; ++i) {
     Listener* listener = &mListeners.ElementAt(i);
     if (listener->mEventType == NS_PAGE_UNLOAD ||
         listener->mEventType == NS_BEFORE_PAGE_UNLOAD) {
       return true;
     }
   }
   return false;
 }
 void
 EventListenerManager::SetEventHandler(nsIAtom* aEventName,
                                       const nsAString& aTypeString,
                                       EventHandlerNonNull* aHandler)
 {
   if (!aHandler) {
     RemoveEventHandler(aEventName, aTypeString);
     return;
   }
   // Untrusted events are always permitted for non-chrome script
   // handlers.
   SetEventHandlerInternal(aEventName, aTypeString, TypedEventHandler(aHandler),
                           !mIsMainThreadELM ||
                           !nsContentUtils::IsCallerChrome());
 }
 void
 EventListenerManager::SetEventHandler(OnErrorEventHandlerNonNull* aHandler)
 {
   if (mIsMainThreadELM) {
     if (!aHandler) {
       RemoveEventHandler(nsGkAtoms::onerror, EmptyString());
       return;
     }
     // Untrusted events are always permitted for non-chrome script
     // handlers.
     SetEventHandlerInternal(nsGkAtoms::onerror, EmptyString(),
                             TypedEventHandler(aHandler),
                             !nsContentUtils::IsCallerChrome());
   } else {
     if (!aHandler) {
       RemoveEventHandler(nullptr, NS_LITERAL_STRING("error"));
       return;
     }
     // Untrusted events are always permitted.
     SetEventHandlerInternal(nullptr, NS_LITERAL_STRING("error"),
                             TypedEventHandler(aHandler), true);
   }
 }
 void
 EventListenerManager::SetEventHandler(
                         OnBeforeUnloadEventHandlerNonNull* aHandler)
 {
   if (!aHandler) {
     RemoveEventHandler(nsGkAtoms::onbeforeunload, EmptyString());
     return;
   }
   // Untrusted events are always permitted for non-chrome script
   // handlers.
   SetEventHandlerInternal(nsGkAtoms::onbeforeunload, EmptyString(),
                           TypedEventHandler(aHandler),
                           !mIsMainThreadELM ||
                           !nsContentUtils::IsCallerChrome());
 }
 const TypedEventHandler*
 EventListenerManager::GetTypedEventHandler(nsIAtom* aEventName,
                                            const nsAString& aTypeString)
 {
   uint32_t eventType = nsContentUtils::GetEventId(aEventName);
   Listener* listener = FindEventHandler(eventType, aEventName, aTypeString);
   if (!listener) {
     return nullptr;
   }
   JSEventHandler* jsEventHandler = listener->GetJSEventHandler();
   if (listener->mHandlerIsString) {
     CompileEventHandlerInternal(listener, nullptr, nullptr);
   }
   const TypedEventHandler& typedHandler =
     jsEventHandler->GetTypedEventHandler();
   return typedHandler.HasEventHandler() ? &typedHandler : nullptr;
 }
 size_t
 EventListenerManager::SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const
 {
   size_t n = aMallocSizeOf(this);
   n += mListeners.SizeOfExcludingThis(aMallocSizeOf);
   uint32_t count = mListeners.Length();
   for (uint32_t i = 0; i < count; ++i) {
     JSEventHandler* jsEventHandler =
       mListeners.ElementAt(i).GetJSEventHandler();
     if (jsEventHandler) {
       n += jsEventHandler->SizeOfIncludingThis(aMallocSizeOf);
     }
   }
   return n;
 }
 void
 EventListenerManager::MarkForCC()
 {
   uint32_t count = mListeners.Length();
   for (uint32_t i = 0; i < count; ++i) {
     const Listener& listener = mListeners.ElementAt(i);
     JSEventHandler* jsEventHandler = listener.GetJSEventHandler();
     if (jsEventHandler) {
       const TypedEventHandler& typedHandler =
         jsEventHandler->GetTypedEventHandler();
       if (typedHandler.HasEventHandler()) {
         JS::ExposeObjectToActiveJS(typedHandler.Ptr()->Callable());
       }
     } else if (listener.mListenerType == Listener::eWrappedJSListener) {
       xpc_TryUnmarkWrappedGrayObject(listener.mListener.GetXPCOMCallback());
     } else if (listener.mListenerType == Listener::eWebIDLListener) {
       // Callback() unmarks gray
       listener.mListener.GetWebIDLCallback()->Callback();
     }
   }
   if (mRefCnt.IsPurple()) {
     mRefCnt.RemovePurple();
   }
 }
 already_AddRefed<nsIScriptGlobalObject>
 EventListenerManager::GetScriptGlobalAndDocument(nsIDocument** aDoc)
 {
   nsCOMPtr<nsINode> node(do_QueryInterface(mTarget));
   nsCOMPtr<nsIDocument> doc;
   nsCOMPtr<nsIScriptGlobalObject> global;
   if (node) {
     // Try to get context from doc
     // XXX sXBL/XBL2 issue -- do we really want the owner here?  What
     // if that's the XBL document?
     doc = node->OwnerDoc();
     if (doc->IsLoadedAsData()) {
       return nullptr;
     }
     // We want to allow compiling an event handler even in an unloaded
     // document, so use GetScopeObject here, not GetScriptHandlingObject.
     global = do_QueryInterface(doc->GetScopeObject());
   } else {
     nsCOMPtr<nsPIDOMWindow> win = GetTargetAsInnerWindow();
     if (win) {
       doc = win->GetExtantDoc();
       global = do_QueryInterface(win);
     } else {
       global = do_QueryInterface(mTarget);
     }
   }
   doc.forget(aDoc);
   return global.forget();
 }
 } // namespace mozilla

The Tor Browser / annotate

dom/events/EventListenerManager.cpp@6474c204b198 (annotated)

dom/events/EventListenerManager.cpp