Introduce WorkletGlobalScopeProxy interface.

third_party/WebKit/Source/core/workers/WorkerThread.cpp

Index: third_party/WebKit/Source/core/workers/WorkerThread.cpp
diff --git a/third_party/WebKit/Source/core/workers/WorkerThread.cpp b/third_party/WebKit/Source/core/workers/WorkerThread.cpp
index 62c4fd888ac86f03869271c109be5607ccb159c8..38b458b6e1a7a9567f52f48b40ae76d464169e2c 100644
--- a/third_party/WebKit/Source/core/workers/WorkerThread.cpp
+++ b/third_party/WebKit/Source/core/workers/WorkerThread.cpp
@@ -53,111 +53,21 @@
 
 namespace blink {
 
-// TODO(nhiroki): Adjust the delay based on UMA.
-const long long kForceTerminationDelayInMs = 2000; // 2 secs
-
-// ForceTerminationTask is used for posting a delayed task to terminate the
-// worker execution from the main thread. This task is expected to run when the
-// shutdown sequence does not start in a certain time period because of an
-// inifite loop in the JS execution context etc. When the shutdown sequence is
-// started before this task runs, the task is simply cancelled.
-class WorkerThread::ForceTerminationTask final {
+class WorkerGlobalScopeFactory final : public WorkerOrWorkletThread::GlobalScopeFactory {
 public:
-    static PassOwnPtr<ForceTerminationTask> create(WorkerThread* workerThread)
-    {
-        return adoptPtr(new ForceTerminationTask(workerThread));
-    }
-
-    void schedule()
+    WorkerOrWorkletGlobalScope* create() const final
     {
-        DCHECK(isMainThread());
-        Platform::current()->mainThread()->getWebTaskRunner()->postDelayedTask(BLINK_FROM_HERE, m_cancellableTaskFactory->cancelAndCreate(), m_workerThread->m_forceTerminationDelayInMs);
+        return m_workerThread.createWorkerGlobalScope(m_startupData.get());
     }
 
-private:
-    explicit ForceTerminationTask(WorkerThread* workerThread)
+    WorkerGlobalScopeFactory(WorkerThread& workerThread, PassOwnPtr<WorkerThreadStartupData> startupData)
         : m_workerThread(workerThread)
-    {
-        DCHECK(isMainThread());
-        m_cancellableTaskFactory = CancellableTaskFactory::create(this, &ForceTerminationTask::run);
-    }
-
-    void run()
-    {
-        DCHECK(isMainThread());
-        MutexLocker lock(m_workerThread->m_threadStateMutex);
-        if (m_workerThread->m_readyToShutdown) {
-            // Shutdown sequence is now running. Just return.
-            return;
-        }
-
-        m_workerThread->forciblyTerminateExecution();
-        DCHECK_EQ(WorkerThread::ExitCode::NotTerminated, m_workerThread->m_exitCode);
-        m_workerThread->m_exitCode = WorkerThread::ExitCode::AsyncForciblyTerminated;
-    }
-
-    WorkerThread* m_workerThread;
-    OwnPtr<CancellableTaskFactory> m_cancellableTaskFactory;
-};
-
-class WorkerThread::WorkerMicrotaskRunner final : public WebThread::TaskObserver {
-public:
-    explicit WorkerMicrotaskRunner(WorkerThread* workerThread)
-        : m_workerThread(workerThread)
-    {
-    }
-
-    void willProcessTask() override
-    {
-        // No tasks should get executed after we have closed.
-        DCHECK(!m_workerThread->workerGlobalScope() || !m_workerThread->workerGlobalScope()->isClosing());
-    }
-
-    void didProcessTask() override
-    {
-        Microtask::performCheckpoint(m_workerThread->isolate());
-        if (WorkerGlobalScope* globalScope = m_workerThread->workerGlobalScope()) {
-            if (WorkerOrWorkletScriptController* scriptController = globalScope->scriptController())
-                scriptController->getRejectedPromises()->processQueue();
-            if (globalScope->isClosing()) {
-                // |m_workerThread| will eventually be requested to terminate.
-                m_workerThread->workerReportingProxy().workerGlobalScopeClosed();
-
-                // Stop further worker tasks to run after this point.
-                m_workerThread->prepareForShutdownOnWorkerThread();
-            }
-        }
-    }
-
+        , m_startupData(std::move(startupData)) { }
 private:
-    // Thread owns the microtask runner; reference remains
-    // valid for the lifetime of this object.
-    WorkerThread* m_workerThread;
-};
-
-static Mutex& threadSetMutex()
-{
-    DEFINE_THREAD_SAFE_STATIC_LOCAL(Mutex, mutex, new Mutex);
-    return mutex;
-}
-
-static HashSet<WorkerThread*>& workerThreads()
-{
-    DEFINE_STATIC_LOCAL(HashSet<WorkerThread*>, threads, ());
-    return threads;
-}
-
-WorkerThread::~WorkerThread()
-{
-    DCHECK(isMainThread());
-    MutexLocker lock(threadSetMutex());
-    DCHECK(workerThreads().contains(this));
-    workerThreads().remove(this);
 
-    // TODO(nhiroki): Record how this thread is terminated (i.e. m_exitCode)
-    // in UMA.
-    DCHECK_NE(ExitCode::NotTerminated, m_exitCode);
-}
+    WorkerThread& m_workerThread;
+    OwnPtr<WorkerThreadStartupData> m_startupData;
+};
 
 void WorkerThread::start(PassOwnPtr<WorkerThreadStartupData> startupData)
 {
@@ -170,229 +80,10 @@ void WorkerThread::start(PassOwnPtr<WorkerThreadStartupData> startupData)
     workerBackingThread().backingThread().postTask(BLINK_FROM_HERE, threadSafeBind(&WorkerThread::initializeOnWorkerThread, AllowCrossThreadAccess(this), passed(std::move(startupData))));
 }
 
-void WorkerThread::terminate()
-{
-    DCHECK(isMainThread());
-    terminateInternal(TerminationMode::Graceful);
-}
-
-void WorkerThread::terminateAndWait()
-{
-    DCHECK(isMainThread());
-
-    // The main thread will be blocked, so asynchronous graceful shutdown does
-    // not work.
-    terminateInternal(TerminationMode::Forcible);
-    m_shutdownEvent->wait();
-}
-
-void WorkerThread::terminateAndWaitForAllWorkers()
-{
-    DCHECK(isMainThread());
-
-    // Keep this lock to prevent WorkerThread instances from being destroyed.
-    MutexLocker lock(threadSetMutex());
-    HashSet<WorkerThread*> threads = workerThreads();
-
-    // The main thread will be blocked, so asynchronous graceful shutdown does
-    // not work.
-    for (WorkerThread* thread : threads)
-        thread->terminateInternal(TerminationMode::Forcible);
-
-    for (WorkerThread* thread : threads)
-        thread->m_shutdownEvent->wait();
-}
-
-v8::Isolate* WorkerThread::isolate()
-{
-    return workerBackingThread().isolate();
-}
-
-bool WorkerThread::isCurrentThread()
-{
-    return m_started && workerBackingThread().backingThread().isCurrentThread();
-}
-
-void WorkerThread::postTask(const WebTraceLocation& location, std::unique_ptr<ExecutionContextTask> task)
-{
-    workerBackingThread().backingThread().postTask(location, createWorkerThreadTask(std::move(task), true));
-}
-
-void WorkerThread::appendDebuggerTask(std::unique_ptr<CrossThreadClosure> task)
-{
-    {
-        MutexLocker lock(m_threadStateMutex);
-        if (m_readyToShutdown)
-            return;
-    }
-    m_inspectorTaskRunner->appendTask(threadSafeBind(&WorkerThread::runDebuggerTaskOnWorkerThread, AllowCrossThreadAccess(this), passed(std::move(task))));
-    {
-        MutexLocker lock(m_threadStateMutex);
-        if (isolate())
-            m_inspectorTaskRunner->interruptAndRunAllTasksDontWait(isolate());
-    }
-    workerBackingThread().backingThread().postTask(BLINK_FROM_HERE, threadSafeBind(&WorkerThread::runDebuggerTaskDontWaitOnWorkerThread, AllowCrossThreadAccess(this)));
-}
-
-void WorkerThread::startRunningDebuggerTasksOnPause()
-{
-    m_pausedInDebugger = true;
-    ThreadDebugger::idleStarted(isolate());
-    std::unique_ptr<CrossThreadClosure> task;
-    do {
-        {
-            SafePointScope safePointScope(BlinkGC::HeapPointersOnStack);
-            task = m_inspectorTaskRunner->takeNextTask(InspectorTaskRunner::WaitForTask);
-        }
-        if (task)
-            (*task)();
-    // Keep waiting until execution is resumed.
-    } while (task && m_pausedInDebugger);
-    ThreadDebugger::idleFinished(isolate());
-}
-
-void WorkerThread::stopRunningDebuggerTasksOnPause()
-{
-    m_pausedInDebugger = false;
-}
-
-WorkerGlobalScope* WorkerThread::workerGlobalScope()
-{
-    DCHECK(isCurrentThread());
-    return m_workerGlobalScope.get();
-}
-
-bool WorkerThread::terminated()
-{
-    MutexLocker lock(m_threadStateMutex);
-    return m_terminated;
-}
-
-unsigned WorkerThread::workerThreadCount()
-{
-    MutexLocker lock(threadSetMutex());
-    return workerThreads().size();
-}
-
-PlatformThreadId WorkerThread::platformThreadId()
-{
-    if (!m_started)
-        return 0;
-    return workerBackingThread().backingThread().platformThread().threadId();
-}
-
 WorkerThread::WorkerThread(PassRefPtr<WorkerLoaderProxy> workerLoaderProxy, WorkerReportingProxy& workerReportingProxy)
-    : m_forceTerminationDelayInMs(kForceTerminationDelayInMs)
-    , m_inspectorTaskRunner(adoptPtr(new InspectorTaskRunner()))
+    : WorkerOrWorkletThread(workerReportingProxy)
     , m_workerLoaderProxy(workerLoaderProxy)
-    , m_workerReportingProxy(workerReportingProxy)
-    , m_terminationEvent(adoptPtr(new WaitableEvent(
-        WaitableEvent::ResetPolicy::Manual,
-        WaitableEvent::InitialState::NonSignaled)))
-    , m_shutdownEvent(adoptPtr(new WaitableEvent(
-        WaitableEvent::ResetPolicy::Manual,
-        WaitableEvent::InitialState::NonSignaled)))
 {
-    MutexLocker lock(threadSetMutex());
-    workerThreads().add(this);
-}
-
-std::unique_ptr<CrossThreadClosure> WorkerThread::createWorkerThreadTask(std::unique_ptr<ExecutionContextTask> task, bool isInstrumented)
-{
-    if (isInstrumented)
-        isInstrumented = !task->taskNameForInstrumentation().isEmpty();
-    if (isInstrumented) {
-        DCHECK(isCurrentThread());
-        InspectorInstrumentation::asyncTaskScheduled(workerGlobalScope(), "Worker task", task.get());
-    }
-    return threadSafeBind(&WorkerThread::performTaskOnWorkerThread, AllowCrossThreadAccess(this), passed(std::move(task)), isInstrumented);
-}
-
-void WorkerThread::terminateInternal(TerminationMode mode)
-{
-    DCHECK(m_started);
-
-    // Prevent the deadlock between GC and an attempt to terminate a thread.
-    SafePointScope safePointScope(BlinkGC::HeapPointersOnStack);
-
-    // Protect against this method, initializeOnWorkerThread() or termination
-    // via the global scope racing each other.
-    MutexLocker lock(m_threadStateMutex);
-
-    // If terminate has already been called.
-    if (m_terminated) {
-        // The synchronous forcible termination request should overtake the
-        // scheduled termination task because the request will block the main
-        // thread and the scheduled termination task never runs.
-        if (mode == TerminationMode::Forcible && m_exitCode == ExitCode::NotTerminated) {
-            DCHECK(m_scheduledForceTerminationTask);
-            m_scheduledForceTerminationTask.reset();
-            forciblyTerminateExecution();
-            DCHECK_EQ(ExitCode::NotTerminated, m_exitCode);
-            m_exitCode = ExitCode::SyncForciblyTerminated;
-        }
-        return;
-    }
-    m_terminated = true;
-
-    // Signal the thread to notify that the thread's stopping.
-    if (m_terminationEvent)
-        m_terminationEvent->signal();
-
-    // If the worker thread was never initialized, don't start another
-    // shutdown, but still wait for the thread to signal when shutdown has
-    // completed on initializeOnWorkerThread().
-    if (!m_workerGlobalScope) {
-        DCHECK_EQ(ExitCode::NotTerminated, m_exitCode);
-        m_exitCode = ExitCode::GracefullyTerminated;
-        return;
-    }
-
-    // Determine if we should synchronously terminate or schedule to terminate
-    // the worker execution so that the task can be handled by thread event
-    // loop. If script execution weren't forbidden, a while(1) loop in JS could
-    // keep the thread alive forever.
-    //
-    // (1) |m_readyToShutdown|: It this is set, the worker thread has already
-    // noticed that the thread is about to be terminated and the worker global
-    // scope is already disposed, so we don't have to explicitly terminate the
-    // worker execution.
-    //
-    // (2) |workerScriptCount() == 1|: If other WorkerGlobalScopes are running
-    // on the worker thread, we should not terminate the worker execution. This
-    // condition is not entirely correct because other scripts can be being
-    // initialized or terminated simuletaneously. Though this function itself is
-    // protected by a mutex, it is possible that |workerScriptCount()| here is
-    // not consistent with that in |initialize| and |shutdown|.
-    //
-    // (3) |m_runningDebuggerTask|: Terminating during debugger task may lead to
-    // crash due to heavy use of v8 api in debugger. Any debugger task is
-    // guaranteed to finish, so we can wait for the completion.
-    bool shouldScheduleToTerminateExecution = !m_readyToShutdown && (workerBackingThread().workerScriptCount() == 1) && !m_runningDebuggerTask;
-
-    if (shouldScheduleToTerminateExecution) {
-        if (mode == TerminationMode::Forcible) {
-            forciblyTerminateExecution();
-            DCHECK_EQ(ExitCode::NotTerminated, m_exitCode);
-            m_exitCode = ExitCode::SyncForciblyTerminated;
-        } else {
-            DCHECK_EQ(TerminationMode::Graceful, mode);
-            DCHECK(!m_scheduledForceTerminationTask);
-            m_scheduledForceTerminationTask = ForceTerminationTask::create(this);
-            m_scheduledForceTerminationTask->schedule();
-        }
-    }
-
-    m_inspectorTaskRunner->kill();
-    workerBackingThread().backingThread().postTask(BLINK_FROM_HERE, threadSafeBind(&WorkerThread::prepareForShutdownOnWorkerThread, AllowCrossThreadAccess(this)));
-    workerBackingThread().backingThread().postTask(BLINK_FROM_HERE, threadSafeBind(&WorkerThread::performShutdownOnWorkerThread, AllowCrossThreadAccess(this)));
-}
-
-void WorkerThread::forciblyTerminateExecution()
-{
-    DCHECK(m_workerGlobalScope);
-    m_workerGlobalScope->scriptController()->willScheduleExecutionTermination();
-    isolate()->TerminateExecution();
 }
 
 void WorkerThread::initializeOnWorkerThread(PassOwnPtr<WorkerThreadStartupData> startupData)
@@ -403,177 +94,22 @@ void WorkerThread::initializeOnWorkerThread(PassOwnPtr<WorkerThreadStartupData>
     OwnPtr<Vector<char>> cachedMetaData = std::move(startupData->m_cachedMetaData);
     V8CacheOptions v8CacheOptions = startupData->m_v8CacheOptions;
 
-    {
-        MutexLocker lock(m_threadStateMutex);
-
-        // The worker was terminated before the thread had a chance to run.
-        if (m_terminated) {
-            DCHECK_EQ(ExitCode::GracefullyTerminated, m_exitCode);
-
-            // Notify the proxy that the WorkerGlobalScope has been disposed of.
-            // This can free this thread object, hence it must not be touched
-            // afterwards.
-            m_workerReportingProxy.workerThreadTerminated();
-
-            // Notify the main thread that it is safe to deallocate our
-            // resources.
-            m_shutdownEvent->signal();
-            return;
-        }
-
-        workerBackingThread().attach();
-
-        if (shouldAttachThreadDebugger())
-            V8PerIsolateData::from(isolate())->setThreadDebugger(adoptPtr(new WorkerThreadDebugger(this, isolate())));
-        m_microtaskRunner = adoptPtr(new WorkerMicrotaskRunner(this));
-        workerBackingThread().backingThread().addTaskObserver(m_microtaskRunner.get());
-
-        // Optimize for memory usage instead of latency for the worker isolate.
-        isolate()->IsolateInBackgroundNotification();
-        m_workerGlobalScope = createWorkerGlobalScope(std::move(startupData));
-        m_workerGlobalScope->scriptLoaded(sourceCode.length(), cachedMetaData.get() ? cachedMetaData->size() : 0);
-
-        // Notify proxy that a new WorkerGlobalScope has been created and started.
-        m_workerReportingProxy.workerGlobalScopeStarted(m_workerGlobalScope.get());
+    WorkerGlobalScopeFactory factory(*this, std::move(startupData));
+    initializeGlobalScope(factory);
+    if (m_terminated)
+        return;
 
-        WorkerOrWorkletScriptController* scriptController = m_workerGlobalScope->scriptController();
-        if (!scriptController->isExecutionForbidden()) {
-            scriptController->initializeContextIfNeeded();
-
-            // If Origin Trials have been registered before the V8 context was ready,
-            // then inject them into the context now
-            ExecutionContext* executionContext = m_workerGlobalScope->getExecutionContext();
-            if (executionContext) {
-                OriginTrialContext* originTrialContext = OriginTrialContext::from(executionContext);
-                if (originTrialContext)
-                    originTrialContext->initializePendingFeatures();
-            }
-        }
-    }
+    toWorkerGlobalScope(globalScope())->scriptLoaded(sourceCode.length(), cachedMetaData.get() ? cachedMetaData->size() : 0);
 
     if (startMode == PauseWorkerGlobalScopeOnStart)
         startRunningDebuggerTasksOnPause();
 
-    if (m_workerGlobalScope->scriptController()->isContextInitialized()) {
-        m_workerReportingProxy.didInitializeWorkerContext();
-        v8::HandleScope handleScope(isolate());
-        Platform::current()->workerContextCreated(m_workerGlobalScope->scriptController()->context());
-    }
-
-    CachedMetadataHandler* handler = workerGlobalScope()->createWorkerScriptCachedMetadataHandler(scriptURL, cachedMetaData.get());
-    bool success = m_workerGlobalScope->scriptController()->evaluate(ScriptSourceCode(sourceCode, scriptURL), nullptr, handler, v8CacheOptions);
-    m_workerGlobalScope->didEvaluateWorkerScript();
-    m_workerReportingProxy.didEvaluateWorkerScript(success);
+    CachedMetadataHandler* handler = toWorkerGlobalScope(globalScope())->createWorkerScriptCachedMetadataHandler(scriptURL, cachedMetaData.get());
+    bool success = globalScope()->scriptController()->evaluate(ScriptSourceCode(sourceCode, scriptURL), nullptr, handler, v8CacheOptions);
+    toWorkerGlobalScope(globalScope())->didEvaluateWorkerScript();
+    workerReportingProxy().didEvaluateWorkerScript(success);
 
     postInitialize();
 }
 
-void WorkerThread::prepareForShutdownOnWorkerThread()
-{
-    DCHECK(isCurrentThread());
-    {
-        MutexLocker lock(m_threadStateMutex);
-        if (m_readyToShutdown)
-            return;
-        m_readyToShutdown = true;
-        if (m_exitCode == ExitCode::NotTerminated)
-            m_exitCode = ExitCode::GracefullyTerminated;
-    }
-
-    workerReportingProxy().willDestroyWorkerGlobalScope();
-    InspectorInstrumentation::allAsyncTasksCanceled(workerGlobalScope());
-    workerGlobalScope()->dispose();
-    workerBackingThread().backingThread().removeTaskObserver(m_microtaskRunner.get());
-}
-
-void WorkerThread::performShutdownOnWorkerThread()
-{
-    DCHECK(isCurrentThread());
-#if DCHECK_IS_ON
-    {
-        MutexLocker lock(m_threadStateMutex);
-        DCHECK(m_terminated);
-        DCHECK(m_readyToShutdown);
-    }
-#endif
-
-    // 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. If Oilpan
-    // is enabled, we detach of the context/global scope, with the final heap
-    // cleanup below sweeping it out.
-    m_workerGlobalScope->notifyContextDestroyed();
-    m_workerGlobalScope = nullptr;
-
-    workerBackingThread().detach();
-    // We must not touch workerBackingThread() from now on.
-
-    m_microtaskRunner = nullptr;
-
-    // Notify the proxy that the WorkerGlobalScope has been disposed of.
-    // This can free this thread object, hence it must not be touched
-    // afterwards.
-    workerReportingProxy().workerThreadTerminated();
-
-    m_shutdownEvent->signal();
-}
-
-void WorkerThread::performTaskOnWorkerThread(std::unique_ptr<ExecutionContextTask> task, bool isInstrumented)
-{
-    DCHECK(isCurrentThread());
-    {
-        MutexLocker lock(m_threadStateMutex);
-        if (m_readyToShutdown)
-            return;
-    }
-
-    WorkerGlobalScope* globalScope = workerGlobalScope();
-    // If the thread is terminated before it had a chance initialize (see
-    // WorkerThread::Initialize()), we mustn't run any of the posted tasks.
-    if (!globalScope) {
-        DCHECK(terminated());
-        return;
-    }
-
-    InspectorInstrumentation::AsyncTask asyncTask(globalScope, task.get(), isInstrumented);
-    task->performTask(globalScope);
-}
-
-void WorkerThread::runDebuggerTaskOnWorkerThread(std::unique_ptr<CrossThreadClosure> task)
-{
-    DCHECK(isCurrentThread());
-    InspectorTaskRunner::IgnoreInterruptsScope scope(m_inspectorTaskRunner.get());
-    {
-        MutexLocker lock(m_threadStateMutex);
-        m_runningDebuggerTask = true;
-    }
-    ThreadDebugger::idleFinished(isolate());
-    (*task)();
-    ThreadDebugger::idleStarted(isolate());
-    {
-        MutexLocker lock(m_threadStateMutex);
-        m_runningDebuggerTask = false;
-
-        if (!m_terminated)
-            return;
-        // terminate() was called. Shutdown sequence will start soon.
-    }
-    // Stop further worker tasks to run after this point.
-    prepareForShutdownOnWorkerThread();
-}
-
-void WorkerThread::runDebuggerTaskDontWaitOnWorkerThread()
-{
-    DCHECK(isCurrentThread());
-    std::unique_ptr<CrossThreadClosure> task = m_inspectorTaskRunner->takeNextTask(InspectorTaskRunner::DontWaitForTask);
-    if (task)
-        (*task)();
-}
-
-WorkerThread::ExitCode WorkerThread::getExitCode()
-{
-    MutexLocker lock(m_threadStateMutex);
-    return m_exitCode;
-}
-
 } // namespace blink