void V8WorkerGlobalScopeEventListener::handleEvent(ExecutionContext* context, Event* event)
{
if (!context)
return;
// 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::Isolate* isolate = toIsolate(context);
v8::HandleScope handleScope(isolate);
WorkerScriptController* script = toWorkerGlobalScope(context)->script();
if (!script)
return;
v8::Handle<v8::Context> v8Context = script->context();
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, v8::Handle<v8::Object>(), isolate);
invokeEventHandler(context, event, v8::Local<v8::Value>::New(isolate, jsEvent));
}
// static
WorkerContextProxy* WebWorkerClientImpl::createWorkerContextProxy(Worker* worker)
{
// Special behavior for multiple workers per process.
// FIXME: v8 doesn't support more than one workers per process.
// if (!worker->scriptExecutionContext()->isDocument())
// return new WorkerMessagingProxy(worker);
WebWorker* webWorker = 0;
WebWorkerClientImpl* proxy = new WebWorkerClientImpl(worker);
if (worker->scriptExecutionContext()->isDocument()) {
Document* document = static_cast<Document*>(
worker->scriptExecutionContext());
WebFrameImpl* webFrame = WebFrameImpl::fromFrame(document->frame());
webWorker = webFrame->client()->createWorker(webFrame, proxy);
} else {
WorkerScriptController* controller = WorkerScriptController::controllerForContext();
if (!controller) {
ASSERT_NOT_REACHED();
return 0;
}
DedicatedWorkerThread* thread = static_cast<DedicatedWorkerThread*>(controller->workerContext()->thread());
WorkerObjectProxy* workerObjectProxy = &thread->workerObjectProxy();
WebWorkerImpl* impl = reinterpret_cast<WebWorkerImpl*>(workerObjectProxy);
webWorker = impl->client()->createWorker(proxy);
}
proxy->setWebWorker(webWorker);
return proxy;
}
void V8WorkerContextEventListener::handleEvent(ScriptExecutionContext* context, Event* event)
{
if (!context)
return;
// 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;
ASSERT(context->isWorkerContext());
WorkerScriptController* script = static_cast<WorkerContext*>(context)->script();
if (!script)
return;
v8::Handle<v8::Context> v8Context = script->context();
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);
invokeEventHandler(context, event, jsEvent);
}
void* WorkerThread::workerThread()
{
{
MutexLocker lock(m_threadCreationMutex);
m_workerContext = createWorkerContext(m_startupData->m_scriptURL, m_startupData->m_userAgent);
if (m_runLoop.terminated()) {
// The worker was terminated before the thread had a chance to run. Since the context didn't exist yet,
// forbidExecution() couldn't be called from stop().
m_workerContext->script()->forbidExecution();
}
}
WorkerScriptController* script = m_workerContext->script();
script->evaluate(ScriptSourceCode(m_startupData->m_sourceCode, m_startupData->m_scriptURL));
// Free the startup data to cause its member variable deref's happen on the worker's thread (since
// all ref/derefs of these objects are happening on the thread at this point). Note that
// WorkerThread::~WorkerThread happens on a different thread where it was created.
m_startupData.clear();
runEventLoop();
ThreadIdentifier threadID = m_threadID;
ASSERT(m_workerContext->hasOneRef());
// The below assignment will destroy the context, which will in turn notify messaging proxy.
// We cannot let any objects survive past thread exit, because no other thread will run GC or otherwise destroy them.
m_workerContext = 0;
// The thread object may be already destroyed from notification now, don't try to access "this".
detachThread(threadID);
return 0;
}
void executeScriptInWorker(WorkerThread* worker, WebWaitableEvent* waitEvent)
{
WorkerScriptController* scriptController = worker->workerGlobalScope()->script();
bool evaluateResult = scriptController->evaluate(ScriptSourceCode("var counter = 0; ++counter;"));
ASSERT_UNUSED(evaluateResult, evaluateResult);
waitEvent->signal();
}
bool ActiveDOMCallback::isScriptControllerTerminating() const
{
ExecutionContext* context = executionContext();
if (context && context->isWorkerGlobalScope()) {
WorkerScriptController* scriptController = toWorkerGlobalScope(context)->script();
if (!scriptController || scriptController->isExecutionForbidden() || scriptController->isExecutionTerminating())
return true;
}
return false;
}
JSValue toJS(ExecState*, WorkerContext* workerContext)
{
if (!workerContext)
return jsNull();
WorkerScriptController* script = workerContext->script();
if (!script)
return jsNull();
JSWorkerContext* contextWrapper = script->workerContextWrapper();
ASSERT(contextWrapper);
return contextWrapper;
}
v8::Local<v8::Function> V8DOMWrapper::getConstructor(WrapperTypeInfo* type, WorkerContext*)
{
WorkerScriptController* controller = WorkerScriptController::controllerForContext();
WorkerContextExecutionProxy* proxy = controller ? controller->proxy() : 0;
if (!proxy)
return v8::Local<v8::Function>();
v8::Handle<v8::Context> context = proxy->context();
if (context.IsEmpty())
return v8::Local<v8::Function>();
return getConstructorForContext(type, context);
}
void WorkerThread::workerThread()
{
// Propagate the mainThread's fenv to workers.
#if PLATFORM(IOS)
FloatingPointEnvironment::singleton().propagateMainThreadEnvironment();
#endif
#if PLATFORM(GTK)
GRefPtr<GMainContext> mainContext = adoptGRef(g_main_context_new());
g_main_context_push_thread_default(mainContext.get());
#endif
{
LockHolder lock(m_threadCreationMutex);
m_workerGlobalScope = createWorkerGlobalScope(m_startupData->m_scriptURL, m_startupData->m_userAgent, m_startupData->m_contentSecurityPolicyResponseHeaders, m_startupData->m_shouldBypassMainWorldContentSecurityPolicy, WTFMove(m_startupData->m_topOrigin));
if (m_runLoop.terminated()) {
// The worker was terminated before the thread had a chance to run. Since the context didn't exist yet,
// forbidExecution() couldn't be called from stop().
m_workerGlobalScope->script()->forbidExecution();
}
}
WorkerScriptController* script = m_workerGlobalScope->script();
script->evaluate(ScriptSourceCode(m_startupData->m_sourceCode, m_startupData->m_scriptURL));
// Free the startup data to cause its member variable deref's happen on the worker's thread (since
// all ref/derefs of these objects are happening on the thread at this point). Note that
// WorkerThread::~WorkerThread happens on a different thread where it was created.
m_startupData = nullptr;
runEventLoop();
#if PLATFORM(GTK)
g_main_context_pop_thread_default(mainContext.get());
#endif
ThreadIdentifier threadID = m_threadID;
ASSERT(m_workerGlobalScope->hasOneRef());
// The below assignment will destroy the context, which will in turn notify messaging proxy.
// We cannot let any objects survive past thread exit, because no other thread will run GC or otherwise destroy them.
m_workerGlobalScope = nullptr;
// Clean up WebCore::ThreadGlobalData before WTF::WTFThreadData goes away!
threadGlobalData().destroy();
// The thread object may be already destroyed from notification now, don't try to access "this".
detachThread(threadID);
}
v8::Handle<v8::Value> toV8(WorkerContext* impl, v8::Handle<v8::Object> creationContext, v8::Isolate* isolate)
{
// Notice that we explicitly ignore creationContext because the WorkerContext is its own creationContext.
if (!impl)
return v8NullWithCheck(isolate);
WorkerScriptController* script = impl->script();
if (!script)
return v8NullWithCheck(isolate);
v8::Handle<v8::Object> global = script->context()->Global();
ASSERT(!global.IsEmpty());
return global;
}
void ScheduledAction::execute(WorkerContext* workerContext)
{
// In a Worker, the execution should always happen on a worker thread.
ASSERT(workerContext->thread()->threadID() == currentThread());
WorkerScriptController* scriptController = workerContext->script();
if (m_function) {
JSWorkerContext* contextWrapper = scriptController->workerContextWrapper();
executeFunctionInContext(contextWrapper, contextWrapper, workerContext);
} else {
ScriptSourceCode code(m_code, workerContext->url());
scriptController->evaluate(code);
}
}
void ScheduledAction::execute(WorkerContext* workerContext)
{
// In a Worker, the execution should always happen on a worker thread.
ASSERT(workerContext->thread()->threadID() == currentThread());
WorkerScriptController* scriptController = workerContext->script();
if (!m_function.IsEmpty() && m_function->IsFunction()) {
v8::HandleScope handleScope;
v8::Handle<v8::Context> v8Context = v8::Local<v8::Context>::New(m_context.get());
ASSERT(!v8Context.IsEmpty());
v8::Context::Scope scope(v8Context);
m_function->Call(v8Context->Global(), m_argc, m_argv);
} else
scriptController->evaluate(m_code);
}
void WebWorkerBase::openFileSystem(WebFileSystem::Type type, long long size, WebFileSystemCallbacks* callbacks, bool synchronous)
{
WorkerRunLoop& runLoop = m_workerThread->runLoop();
WorkerScriptController* controller = WorkerScriptController::controllerForContext();
WorkerContext* workerContext = controller->workerContext();
// Create a unique mode for this openFileSystem call.
String mode = openFileSystemMode;
mode.append(String::number(runLoop.createUniqueId()));
RefPtr<WorkerFileSystemCallbacksBridge> bridge = WorkerFileSystemCallbacksBridge::create(this, workerContext, callbacks);
bridge->postOpenFileSystemToMainThread(commonClient(), type, size, mode);
if (synchronous) {
if (runLoop.runInMode(workerContext, mode) == MessageQueueTerminated)
bridge->stop();
}
}
void WorkerThread::workerThread()
{
// Propagate the mainThread's fenv to workers.
#if PLATFORM(IOS)
fesetenv(&mainThreadFEnv);
#endif
{
MutexLocker lock(m_threadCreationMutex);
m_workerGlobalScope = createWorkerGlobalScope(m_startupData->m_scriptURL, m_startupData->m_userAgent, std::move(m_startupData->m_groupSettings), m_startupData->m_contentSecurityPolicy, m_startupData->m_contentSecurityPolicyType, m_startupData->m_topOrigin.release());
if (m_runLoop.terminated()) {
// The worker was terminated before the thread had a chance to run. Since the context didn't exist yet,
// forbidExecution() couldn't be called from stop().
m_workerGlobalScope->script()->forbidExecution();
}
}
WorkerScriptController* script = m_workerGlobalScope->script();
#if ENABLE(INSPECTOR)
InspectorInstrumentation::willEvaluateWorkerScript(workerGlobalScope(), m_startupData->m_startMode);
#endif
script->evaluate(ScriptSourceCode(m_startupData->m_sourceCode, m_startupData->m_scriptURL));
// Free the startup data to cause its member variable deref's happen on the worker's thread (since
// all ref/derefs of these objects are happening on the thread at this point). Note that
// WorkerThread::~WorkerThread happens on a different thread where it was created.
m_startupData.clear();
runEventLoop();
ThreadIdentifier threadID = m_threadID;
ASSERT(m_workerGlobalScope->hasOneRef());
// The below assignment will destroy the context, which will in turn notify messaging proxy.
// We cannot let any objects survive past thread exit, because no other thread will run GC or otherwise destroy them.
m_workerGlobalScope = 0;
// Clean up WebCore::ThreadGlobalData before WTF::WTFThreadData goes away!
threadGlobalData().destroy();
// The thread object may be already destroyed from notification now, don't try to access "this".
detachThread(threadID);
}
static void promiseRejectHandlerInWorker(v8::PromiseRejectMessage data)
{
v8::Local<v8::Promise> promise = data.GetPromise();
// Bail out if called during context initialization.
v8::Isolate* isolate = promise->GetIsolate();
ScriptState* scriptState = ScriptState::current(isolate);
if (!scriptState->contextIsValid())
return;
ExecutionContext* executionContext = scriptState->executionContext();
if (!executionContext)
return;
ASSERT(executionContext->isWorkerGlobalScope());
WorkerScriptController* scriptController = toWorkerGlobalScope(executionContext)->script();
ASSERT(scriptController);
if (data.GetEvent() == v8::kPromiseHandlerAddedAfterReject) {
scriptController->rejectedPromises()->handlerAdded(data);
return;
}
ASSERT(data.GetEvent() == v8::kPromiseRejectWithNoHandler);
int scriptId = 0;
int lineNumber = 0;
int columnNumber = 0;
String resourceName;
String errorMessage;
v8::Local<v8::Message> message = v8::Exception::CreateMessage(data.GetValue());
if (!message.IsEmpty()) {
TOSTRING_VOID(V8StringResource<>, resourceName, message->GetScriptOrigin().ResourceName());
scriptId = message->GetScriptOrigin().ScriptID()->Value();
if (v8Call(message->GetLineNumber(scriptState->context()), lineNumber)
&& v8Call(message->GetStartColumn(scriptState->context()), columnNumber))
++columnNumber;
// message->Get() can be empty here. https://crbug.com/450330
errorMessage = toCoreStringWithNullCheck(message->Get());
}
scriptController->rejectedPromises()->rejectedWithNoHandler(scriptState, data, errorMessage, resourceName, scriptId, lineNumber, columnNumber, nullptr);
}
v8::Handle<v8::Value> SetTimeoutOrInterval(const v8::Arguments& args, bool singleShot)
{
WorkerContext* workerContext = V8WorkerContext::toNative(args.Holder());
int argumentCount = args.Length();
if (argumentCount < 1)
return v8::Undefined();
v8::Handle<v8::Value> function = args[0];
int32_t timeout = argumentCount >= 2 ? args[1]->Int32Value() : 0;
int timerId;
WorkerScriptController* script = workerContext->script();
if (!script)
return v8::Undefined();
v8::Handle<v8::Context> v8Context = script->context();
if (function->IsString()) {
if (ContentSecurityPolicy* policy = workerContext->contentSecurityPolicy()) {
if (!policy->allowEval())
return v8Integer(0, args.GetIsolate());
}
WTF::String stringFunction = toWebCoreString(function);
timerId = DOMTimer::install(workerContext, adoptPtr(new ScheduledAction(v8Context, stringFunction, workerContext->url())), timeout, singleShot);
} else if (function->IsFunction()) {
size_t paramCount = argumentCount >= 2 ? argumentCount - 2 : 0;
v8::Local<v8::Value>* params = 0;
if (paramCount > 0) {
params = new v8::Local<v8::Value>[paramCount];
for (size_t i = 0; i < paramCount; ++i)
params[i] = args[i+2];
}
// ScheduledAction takes ownership of actual params and releases them in its destructor.
OwnPtr<ScheduledAction> action = adoptPtr(new ScheduledAction(v8Context, v8::Handle<v8::Function>::Cast(function), paramCount, params));
// FIXME: We should use a OwnArrayPtr for params.
delete [] params;
timerId = DOMTimer::install(workerContext, action.release(), timeout, singleShot);
} else
return v8::Undefined();
return v8Integer(timerId, args.GetIsolate());
}
bool WebWorkerBase::allowDatabase(WebFrame*, const WebString& name, const WebString& displayName, unsigned long estimatedSize)
{
WorkerRunLoop& runLoop = m_workerThread->runLoop();
WorkerScriptController* controller = WorkerScriptController::controllerForContext();
WorkerContext* workerContext = controller->workerContext();
// Create a unique mode just for this synchronous call.
String mode = allowDatabaseMode;
mode.append(String::number(runLoop.createUniqueId()));
RefPtr<AllowDatabaseMainThreadBridge> bridge = AllowDatabaseMainThreadBridge::create(this, mode, commonClient(), m_webView->mainFrame(), String(name), String(displayName), estimatedSize);
// Either the bridge returns, or the queue gets terminated.
if (runLoop.runInMode(workerContext, mode) == MessageQueueTerminated) {
bridge->cancel();
return false;
}
return bridge->result();
}
v8::Local<v8::Function> V8DOMWrapper::constructorForType(WrapperTypeInfo* type, WorkerContext*)
{
WorkerScriptController* controller = WorkerScriptController::controllerForContext();
WorkerContextExecutionProxy* proxy = controller ? controller->proxy() : 0;
return proxy ? proxy->perContextData()->constructorForType(type) : v8::Local<v8::Function>();
}
V8BindingPerContextData* V8DOMWrapper::perContextData(WorkerContext*)
{
WorkerScriptController* controller = WorkerScriptController::controllerForContext();
WorkerContextExecutionProxy* proxy = controller ? controller->proxy() : 0;
return proxy ? proxy->perContextData() : 0;
}
