| /* |
| * Copyright (C) 2006, 2007, 2008, 2009 Google Inc. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are |
| * met: |
| * |
| * * Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * * Redistributions in binary form must reproduce the above |
| * copyright notice, this list of conditions and the following disclaimer |
| * in the documentation and/or other materials provided with the |
| * distribution. |
| * * Neither the name of Google Inc. nor the names of its |
| * contributors may be used to endorse or promote products derived from |
| * this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #include "config.h" |
| #include "V8AbstractEventListener.h" |
| |
| #include "DateExtension.h" |
| #include "Document.h" |
| #include "Event.h" |
| #include "Frame.h" |
| #include "V8Binding.h" |
| #include "V8Event.h" |
| #include "V8EventListenerList.h" |
| #include "V8HiddenPropertyName.h" |
| #include "V8Proxy.h" |
| #include "V8Utilities.h" |
| #include "WorkerContext.h" |
| #include "WorkerContextExecutionProxy.h" |
| |
| namespace WebCore { |
| |
| static void weakEventListenerCallback(v8::Persistent<v8::Value>, void* parameter) |
| { |
| V8AbstractEventListener* listener = static_cast<V8AbstractEventListener*>(parameter); |
| listener->disposeListenerObject(); |
| } |
| |
| V8AbstractEventListener::V8AbstractEventListener(bool isAttribute, const WorldContextHandle& worldContext) |
| : EventListener(JSEventListenerType) |
| , m_isWeak(true) |
| , m_isAttribute(isAttribute) |
| , m_worldContext(worldContext) |
| { |
| } |
| |
| V8AbstractEventListener::~V8AbstractEventListener() |
| { |
| if (!m_listener.IsEmpty()) { |
| v8::HandleScope scope; |
| v8::Local<v8::Object> listener = v8::Local<v8::Object>::New(m_listener); |
| V8EventListenerList::clearWrapper(listener, m_isAttribute); |
| } |
| disposeListenerObject(); |
| } |
| |
| void V8AbstractEventListener::handleEvent(ScriptExecutionContext* context, Event* event) |
| { |
| #ifdef ANDROID |
| // Monkey data shows that we can crash here, due to script executing while the |
| // page's frame has been detached (in the middle of a navigation). |
| // See b/5201341 |
| if (!context) |
| return; |
| #endif |
| |
| // Don't reenter V8 if execution was terminated in this instance of V8. |
| if (context->isJSExecutionForbidden()) |
| return; |
| |
| ASSERT(event); |
| |
| // The callback function on XMLHttpRequest can clear the event listener and destroys 'this' object. Keep a local reference to it. |
| // See issue 889829. |
| RefPtr<V8AbstractEventListener> protect(this); |
| |
| v8::HandleScope handleScope; |
| |
| v8::Local<v8::Context> v8Context = toV8Context(context, worldContext()); |
| if (v8Context.IsEmpty()) |
| return; |
| |
| // Enter the V8 context in which to perform the event handling. |
| v8::Context::Scope scope(v8Context); |
| |
| // Get the V8 wrapper for the event object. |
| v8::Handle<v8::Value> jsEvent = toV8(event); |
| ASSERT(!jsEvent.IsEmpty()); |
| |
| invokeEventHandler(context, event, jsEvent); |
| } |
| |
| void V8AbstractEventListener::disposeListenerObject() |
| { |
| if (!m_listener.IsEmpty()) { |
| #ifndef NDEBUG |
| V8GCController::unregisterGlobalHandle(this, m_listener); |
| #endif |
| m_listener.Dispose(); |
| m_listener.Clear(); |
| } |
| } |
| |
| void V8AbstractEventListener::setListenerObject(v8::Handle<v8::Object> listener) |
| { |
| disposeListenerObject(); |
| m_listener = v8::Persistent<v8::Object>::New(listener); |
| #ifndef NDEBUG |
| V8GCController::registerGlobalHandle(EVENT_LISTENER, this, m_listener); |
| #endif |
| if (m_isWeak) |
| m_listener.MakeWeak(this, &weakEventListenerCallback); |
| } |
| |
| void V8AbstractEventListener::invokeEventHandler(ScriptExecutionContext* context, Event* event, v8::Handle<v8::Value> jsEvent) |
| { |
| // If jsEvent is empty, attempt to set it as a hidden value would crash v8. |
| if (jsEvent.IsEmpty()) |
| return; |
| |
| v8::Local<v8::Context> v8Context = toV8Context(context, worldContext()); |
| if (v8Context.IsEmpty()) |
| return; |
| |
| // We push the event being processed into the global object, so that it can be exposed by DOMWindow's bindings. |
| v8::Handle<v8::String> eventSymbol = V8HiddenPropertyName::event(); |
| v8::Local<v8::Value> returnValue; |
| |
| // In beforeunload/unload handlers, we want to avoid sleeps which do tight loops of calling Date.getTime(). |
| if (event->type() == "beforeunload" || event->type() == "unload") |
| DateExtension::get()->setAllowSleep(false); |
| |
| { |
| // Catch exceptions thrown in the event handler so they do not propagate to javascript code that caused the event to fire. |
| v8::TryCatch tryCatch; |
| tryCatch.SetVerbose(true); |
| |
| // Save the old 'event' property so we can restore it later. |
| v8::Local<v8::Value> savedEvent = v8Context->Global()->GetHiddenValue(eventSymbol); |
| tryCatch.Reset(); |
| |
| // Make the event available in the global object, so DOMWindow can expose it. |
| v8Context->Global()->SetHiddenValue(eventSymbol, jsEvent); |
| tryCatch.Reset(); |
| |
| returnValue = callListenerFunction(context, jsEvent, event); |
| if (tryCatch.HasCaught()) |
| event->target()->uncaughtExceptionInEventHandler(); |
| |
| if (!tryCatch.CanContinue()) { // Result of TerminateExecution(). |
| #if ENABLE(WORKERS) |
| if (context->isWorkerContext()) |
| static_cast<WorkerContext*>(context)->script()->forbidExecution(); |
| #endif |
| return; |
| } |
| tryCatch.Reset(); |
| |
| // Restore the old event. This must be done for all exit paths through this method. |
| if (savedEvent.IsEmpty()) |
| v8Context->Global()->SetHiddenValue(eventSymbol, v8::Undefined()); |
| else |
| v8Context->Global()->SetHiddenValue(eventSymbol, savedEvent); |
| tryCatch.Reset(); |
| } |
| |
| if (event->type() == "beforeunload" || event->type() == "unload") |
| DateExtension::get()->setAllowSleep(true); |
| |
| ASSERT(!V8Proxy::handleOutOfMemory() || returnValue.IsEmpty()); |
| |
| if (returnValue.IsEmpty()) |
| return; |
| |
| if (!returnValue->IsNull() && !returnValue->IsUndefined() && event->storesResultAsString()) |
| event->storeResult(toWebCoreString(returnValue)); |
| |
| // Prevent default action if the return value is false; |
| // FIXME: Add example, and reference to bug entry. |
| if (m_isAttribute && returnValue->IsBoolean() && !returnValue->BooleanValue()) |
| event->preventDefault(); |
| } |
| |
| v8::Local<v8::Object> V8AbstractEventListener::getReceiverObject(Event* event) |
| { |
| if (!m_listener.IsEmpty() && !m_listener->IsFunction()) |
| return v8::Local<v8::Object>::New(m_listener); |
| |
| EventTarget* target = event->currentTarget(); |
| v8::Handle<v8::Value> value = V8DOMWrapper::convertEventTargetToV8Object(target); |
| if (value.IsEmpty()) |
| return v8::Local<v8::Object>(); |
| return v8::Local<v8::Object>::New(v8::Handle<v8::Object>::Cast(value)); |
| } |
| |
| } // namespace WebCore |