workers: Rename WorkerThread to WorkerScript.

Source/core/workers/WorkerThread.cpp

Index: Source/core/workers/WorkerThread.cpp
diff --git a/Source/core/workers/WorkerThread.cpp b/Source/core/workers/WorkerThread.cpp
deleted file mode 100644
index d8f75cc105c1285c6f3df3d80327ff396782a07a..0000000000000000000000000000000000000000
--- a/Source/core/workers/WorkerThread.cpp
+++ /dev/null
@@ -1,615 +0,0 @@
-/*
- * Copyright (C) 2008 Apple 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:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. 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.
- *
- * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``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 APPLE COMPUTER, INC. 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 "core/workers/WorkerThread.h"
-
-#include "bindings/core/v8/ScriptSourceCode.h"
-#include "bindings/core/v8/V8GCController.h"
-#include "bindings/core/v8/V8Initializer.h"
-#include "core/dom/Microtask.h"
-#include "core/inspector/InspectorInstrumentation.h"
-#include "core/inspector/WorkerInspectorController.h"
-#include "core/workers/DedicatedWorkerGlobalScope.h"
-#include "core/workers/WorkerClients.h"
-#include "core/workers/WorkerReportingProxy.h"
-#include "core/workers/WorkerThreadStartupData.h"
-#include "platform/PlatformThreadData.h"
-#include "platform/Task.h"
-#include "platform/ThreadSafeFunctional.h"
-#include "platform/ThreadTimers.h"
-#include "platform/heap/SafePoint.h"
-#include "platform/heap/ThreadState.h"
-#include "platform/weborigin/KURL.h"
-#include "public/platform/Platform.h"
-#include "public/platform/WebThread.h"
-#include "public/platform/WebWaitableEvent.h"
-#include "wtf/Noncopyable.h"
-#include "wtf/WeakPtr.h"
-#include "wtf/text/WTFString.h"
-
-namespace blink {
-
-namespace {
-const int64_t kShortIdleHandlerDelayMs = 1000;
-const int64_t kLongIdleHandlerDelayMs = 10*1000;
-
-class MicrotaskRunner : public WebThread::TaskObserver {
-public:
-    explicit MicrotaskRunner(WorkerThread* workerThread)
-        : m_workerThread(workerThread)
-    {
-    }
-
-    virtual void willProcessTask() override { }
-    virtual void didProcessTask() override
-    {
-        Microtask::performCheckpoint();
-        if (WorkerGlobalScope* globalScope = m_workerThread->workerGlobalScope()) {
-            if (WorkerScriptController* scriptController = globalScope->script())
-                scriptController->rejectedPromises()->processQueue();
-        }
-    }
-
-private:
-    // Thread owns the microtask runner; reference remains
-    // valid for the lifetime of this object.
-    WorkerThread* m_workerThread;
-};
-
-} // namespace
-
-static Mutex& threadSetMutex()
-{
-    AtomicallyInitializedStaticReference(Mutex, mutex, new Mutex);
-    return mutex;
-}
-
-static HashSet<WorkerThread*>& workerThreads()
-{
-    DEFINE_STATIC_LOCAL(HashSet<WorkerThread*>, threads, ());
-    return threads;
-}
-
-unsigned WorkerThread::workerThreadCount()
-{
-    MutexLocker lock(threadSetMutex());
-    return workerThreads().size();
-}
-
-class WorkerThreadCancelableTask final : public ExecutionContextTask {
-    WTF_MAKE_NONCOPYABLE(WorkerThreadCancelableTask); WTF_MAKE_FAST_ALLOCATED(WorkerThreadCancelableTask);
-public:
-    static PassOwnPtr<WorkerThreadCancelableTask> create(PassOwnPtr<Closure> closure)
-    {
-        return adoptPtr(new WorkerThreadCancelableTask(closure));
-    }
-
-    virtual ~WorkerThreadCancelableTask() { }
-
-    virtual void performTask(ExecutionContext*) override
-    {
-        if (!m_taskCanceled)
-            (*m_closure)();
-    }
-
-    WeakPtr<WorkerThreadCancelableTask> createWeakPtr() { return m_weakFactory.createWeakPtr(); }
-    void cancelTask() { m_taskCanceled = true; }
-
-private:
-    explicit WorkerThreadCancelableTask(PassOwnPtr<Closure> closure)
-        : m_closure(closure)
-        , m_weakFactory(this)
-        , m_taskCanceled(false)
-    { }
-
-    OwnPtr<Closure> m_closure;
-    WeakPtrFactory<WorkerThreadCancelableTask> m_weakFactory;
-    bool m_taskCanceled;
-};
-
-class WorkerSharedTimer : public SharedTimer {
-public:
-    explicit WorkerSharedTimer(WorkerThread* workerThread)
-        : m_workerThread(workerThread)
-        , m_running(false)
-    { }
-
-    typedef void (*SharedTimerFunction)();
-    virtual void setFiredFunction(SharedTimerFunction func)
-    {
-        m_sharedTimerFunction = func;
-    }
-
-    virtual void setFireInterval(double interval)
-    {
-        ASSERT(m_sharedTimerFunction);
-
-        // See BlinkPlatformImpl::setSharedTimerFireInterval for explanation of
-        // why ceil is used in the interval calculation.
-        int64_t delay = static_cast<int64_t>(ceil(interval * 1000));
-
-        if (delay < 0) {
-            delay = 0;
-        }
-
-        m_running = true;
-
-        if (m_lastQueuedTask.get())
-            m_lastQueuedTask->cancelTask();
-
-        // Now queue the task as a cancellable one.
-        OwnPtr<WorkerThreadCancelableTask> task = WorkerThreadCancelableTask::create(bind(&WorkerSharedTimer::OnTimeout, this));
-        m_lastQueuedTask = task->createWeakPtr();
-        m_workerThread->postDelayedTask(FROM_HERE, task.release(), delay);
-    }
-
-    virtual void stop()
-    {
-        m_running = false;
-        m_lastQueuedTask = nullptr;
-    }
-
-private:
-    void OnTimeout()
-    {
-        ASSERT(m_workerThread->workerGlobalScope());
-
-        m_lastQueuedTask = nullptr;
-
-        if (m_sharedTimerFunction && m_running && !m_workerThread->workerGlobalScope()->isClosing())
-            m_sharedTimerFunction();
-    }
-
-    WorkerThread* m_workerThread;
-    SharedTimerFunction m_sharedTimerFunction;
-    bool m_running;
-
-    // The task to run OnTimeout, if any. While OnTimeout resets
-    // m_lastQueuedTask, this must be a weak pointer because the
-    // worker runloop may delete the task as it is shutting down.
-    WeakPtr<WorkerThreadCancelableTask> m_lastQueuedTask;
-};
-
-class WorkerThreadTask : public WebThread::Task {
-    WTF_MAKE_NONCOPYABLE(WorkerThreadTask); WTF_MAKE_FAST_ALLOCATED(WorkerThreadTask);
-public:
-    static PassOwnPtr<WorkerThreadTask> create(WorkerThread& workerThread, PassOwnPtr<ExecutionContextTask> task, bool isInstrumented)
-    {
-        return adoptPtr(new WorkerThreadTask(workerThread, task, isInstrumented));
-    }
-
-    virtual ~WorkerThreadTask() { }
-
-    virtual void run() override
-    {
-        WorkerGlobalScope* workerGlobalScope = m_workerThread.workerGlobalScope();
-        // Tasks could be put on the message loop after the cleanup task,
-        // ensure none of those are ran.
-        if (!workerGlobalScope)
-            return;
-
-        if (m_isInstrumented)
-            InspectorInstrumentation::willPerformExecutionContextTask(workerGlobalScope, m_task.get());
-        if ((!workerGlobalScope->isClosing() && !m_workerThread.terminated()) || m_task->isCleanupTask())
-            m_task->performTask(workerGlobalScope);
-        if (m_isInstrumented)
-            InspectorInstrumentation::didPerformExecutionContextTask(workerGlobalScope);
-    }
-
-private:
-    WorkerThreadTask(WorkerThread& workerThread, PassOwnPtr<ExecutionContextTask> task, bool isInstrumented)
-        : m_workerThread(workerThread)
-        , m_task(task)
-        , m_isInstrumented(isInstrumented)
-    {
-        if (m_isInstrumented)
-            m_isInstrumented = !m_task->taskNameForInstrumentation().isEmpty();
-        if (m_isInstrumented)
-            InspectorInstrumentation::didPostExecutionContextTask(m_workerThread.workerGlobalScope(), m_task.get());
-    }
-
-    WorkerThread& m_workerThread;
-    OwnPtr<ExecutionContextTask> m_task;
-    bool m_isInstrumented;
-};
-
-class RunDebuggerQueueTask final : public ExecutionContextTask {
-public:
-    static PassOwnPtr<RunDebuggerQueueTask> create(WorkerThread* thread)
-    {
-        return adoptPtr(new RunDebuggerQueueTask(thread));
-    }
-    virtual void performTask(ExecutionContext* context) override
-    {
-        ASSERT(context->isWorkerGlobalScope());
-        m_thread->runDebuggerTask(WorkerThread::DontWaitForMessage);
-    }
-
-private:
-    explicit RunDebuggerQueueTask(WorkerThread* thread) : m_thread(thread) { }
-
-    WorkerThread* m_thread;
-};
-
-WorkerThread::WorkerThread(PassRefPtr<WorkerLoaderProxy> workerLoaderProxy, WorkerReportingProxy& workerReportingProxy, PassOwnPtr<WorkerThreadStartupData> startupData)
-    : m_started(false)
-    , m_terminated(false)
-    , m_workerLoaderProxy(workerLoaderProxy)
-    , m_workerReportingProxy(workerReportingProxy)
-    , m_startupData(startupData)
-    , m_isolate(nullptr)
-    , m_shutdownEvent(adoptPtr(Platform::current()->createWaitableEvent()))
-    , m_terminationEvent(adoptPtr(Platform::current()->createWaitableEvent()))
-{
-    MutexLocker lock(threadSetMutex());
-    workerThreads().add(this);
-}
-
-WorkerThread::~WorkerThread()
-{
-    MutexLocker lock(threadSetMutex());
-    ASSERT(workerThreads().contains(this));
-    workerThreads().remove(this);
-}
-
-void WorkerThread::start()
-{
-    if (m_started)
-        return;
-
-    m_started = true;
-    backingThread().postTask(FROM_HERE, new Task(threadSafeBind(&WorkerThread::initialize, AllowCrossThreadAccess(this))));
-}
-
-void WorkerThread::interruptAndDispatchInspectorCommands()
-{
-    MutexLocker locker(m_workerInspectorControllerMutex);
-    if (m_workerInspectorController)
-        m_workerInspectorController->interruptAndDispatchInspectorCommands();
-}
-
-PlatformThreadId WorkerThread::platformThreadId()
-{
-    if (!m_started)
-        return 0;
-    return backingThread().platformThread().threadId();
-}
-
-void WorkerThread::initialize()
-{
-    KURL scriptURL = m_startupData->m_scriptURL;
-    String sourceCode = m_startupData->m_sourceCode;
-    WorkerThreadStartMode startMode = m_startupData->m_startMode;
-    OwnPtr<Vector<char>> cachedMetaData = m_startupData->m_cachedMetaData.release();
-    V8CacheOptions v8CacheOptions = m_startupData->m_v8CacheOptions;
-
-    {
-        MutexLocker lock(m_threadCreationMutex);
-
-        // The worker was terminated before the thread had a chance to run.
-        if (m_terminated) {
-            // 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();
-            return;
-        }
-
-        m_microtaskRunner = adoptPtr(new MicrotaskRunner(this));
-        backingThread().addTaskObserver(m_microtaskRunner.get());
-        backingThread().attachGC();
-
-        m_isolate = initializeIsolate();
-        m_workerGlobalScope = createWorkerGlobalScope(m_startupData.release());
-        m_workerGlobalScope->scriptLoaded(sourceCode.length(), cachedMetaData.get() ? cachedMetaData->size() : 0);
-
-        PlatformThreadData::current().threadTimers().setSharedTimer(adoptPtr(new WorkerSharedTimer(this)));
-    }
-
-    // The corresponding call to stopRunLoop() is in ~WorkerScriptController().
-    didStartRunLoop();
-
-    // Notify proxy that a new WorkerGlobalScope has been created and started.
-    m_workerReportingProxy.workerGlobalScopeStarted(m_workerGlobalScope.get());
-
-    WorkerScriptController* script = m_workerGlobalScope->script();
-    if (!script->isExecutionForbidden())
-        script->initializeContextIfNeeded();
-    if (startMode == PauseWorkerGlobalScopeOnStart)
-        m_workerGlobalScope->workerInspectorController()->pauseOnStart();
-
-    OwnPtr<CachedMetadataHandler> handler(workerGlobalScope()->createWorkerScriptCachedMetadataHandler(scriptURL, cachedMetaData.get()));
-    bool success = script->evaluate(ScriptSourceCode(sourceCode, scriptURL), nullptr, handler.get(), v8CacheOptions);
-    m_workerGlobalScope->didEvaluateWorkerScript();
-    m_workerReportingProxy.didEvaluateWorkerScript(success);
-
-    postInitialize();
-
-    postDelayedTask(FROM_HERE, createSameThreadTask(&WorkerThread::idleHandler, this), kShortIdleHandlerDelayMs);
-}
-
-void WorkerThread::cleanup()
-{
-    // This should be called before we start the shutdown procedure.
-    workerReportingProxy().willDestroyWorkerGlobalScope();
-
-    // 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.
-#if !ENABLE(OILPAN)
-    ASSERT(m_workerGlobalScope->hasOneRef());
-#endif
-    m_workerGlobalScope->notifyContextDestroyed();
-    m_workerGlobalScope = nullptr;
-
-    backingThread().detachGC();
-    destroyIsolate();
-
-    backingThread().removeTaskObserver(m_microtaskRunner.get());
-    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_terminationEvent->signal();
-
-    // Clean up PlatformThreadData before WTF::WTFThreadData goes away!
-    PlatformThreadData::current().destroy();
-}
-
-class WorkerThreadShutdownFinishTask : public ExecutionContextTask {
-public:
-    static PassOwnPtr<WorkerThreadShutdownFinishTask> create()
-    {
-        return adoptPtr(new WorkerThreadShutdownFinishTask());
-    }
-
-    virtual void performTask(ExecutionContext *context)
-    {
-        WorkerGlobalScope* workerGlobalScope = toWorkerGlobalScope(context);
-        workerGlobalScope->dispose();
-
-        WorkerThread* workerThread = workerGlobalScope->thread();
-        workerThread->willDestroyIsolate();
-        workerThread->backingThread().postTask(FROM_HERE, new Task(WTF::bind(&WorkerThread::cleanup, workerThread)));
-    }
-
-    virtual bool isCleanupTask() const { return true; }
-};
-
-class WorkerThreadShutdownStartTask : public ExecutionContextTask {
-public:
-    static PassOwnPtr<WorkerThreadShutdownStartTask> create()
-    {
-        return adoptPtr(new WorkerThreadShutdownStartTask());
-    }
-
-    virtual void performTask(ExecutionContext *context)
-    {
-        WorkerGlobalScope* workerGlobalScope = toWorkerGlobalScope(context);
-        workerGlobalScope->stopActiveDOMObjects();
-        PlatformThreadData::current().threadTimers().setSharedTimer(nullptr);
-
-        // Event listeners would keep DOMWrapperWorld objects alive for too long. Also, they have references to JS objects,
-        // which become dangling once Heap is destroyed.
-        workerGlobalScope->removeAllEventListeners();
-
-        // Stick a shutdown command at the end of the queue, so that we deal
-        // with all the cleanup tasks the databases post first.
-        workerGlobalScope->postTask(FROM_HERE, WorkerThreadShutdownFinishTask::create());
-    }
-
-    virtual bool isCleanupTask() const { return true; }
-};
-
-void WorkerThread::stop()
-{
-    // Prevent the deadlock between GC and an attempt to stop a thread.
-    SafePointScope safePointScope(ThreadState::HeapPointersOnStack);
-    stopInternal();
-}
-
-void WorkerThread::stopInShutdownSequence()
-{
-    stopInternal();
-}
-
-void WorkerThread::terminateAndWait()
-{
-    stop();
-    m_terminationEvent->wait();
-}
-
-bool WorkerThread::terminated()
-{
-    MutexLocker lock(m_threadCreationMutex);
-    return m_terminated;
-}
-
-void WorkerThread::stopInternal()
-{
-    // Protect against this method and initialize() racing each other.
-    MutexLocker lock(m_threadCreationMutex);
-
-    // If stop has already been called, just return.
-    if (m_terminated)
-        return;
-    m_terminated = true;
-
-    // Signal the thread to notify that the thread's stopping.
-    if (m_shutdownEvent)
-        m_shutdownEvent->signal();
-
-    if (!m_workerGlobalScope)
-        return;
-
-    // Ensure that tasks are being handled by thread event loop. If script execution weren't forbidden, a while(1) loop in JS could keep the thread alive forever.
-    terminateV8Execution();
-
-    InspectorInstrumentation::didKillAllExecutionContextTasks(m_workerGlobalScope.get());
-    m_debuggerMessageQueue.kill();
-    postTask(FROM_HERE, WorkerThreadShutdownStartTask::create());
-}
-
-void WorkerThread::didStartRunLoop()
-{
-    ASSERT(isCurrentThread());
-    Platform::current()->didStartWorkerRunLoop();
-}
-
-void WorkerThread::didStopRunLoop()
-{
-    ASSERT(isCurrentThread());
-    Platform::current()->didStopWorkerRunLoop();
-}
-
-void WorkerThread::terminateAndWaitForAllWorkers()
-{
-    // Keep this lock to prevent WorkerThread instances from being destroyed.
-    MutexLocker lock(threadSetMutex());
-    HashSet<WorkerThread*> threads = workerThreads();
-    for (WorkerThread* thread : threads)
-        thread->stopInShutdownSequence();
-
-    for (WorkerThread* thread : threads)
-        thread->terminationEvent()->wait();
-}
-
-bool WorkerThread::isCurrentThread()
-{
-    return m_started && backingThread().isCurrentThread();
-}
-
-void WorkerThread::idleHandler()
-{
-    ASSERT(m_workerGlobalScope.get());
-    int64_t delay = kLongIdleHandlerDelayMs;
-
-    // Do a script engine idle notification if the next event is distant enough.
-    const double kMinIdleTimespan = 0.3;
-    const double nextFireTime = PlatformThreadData::current().threadTimers().nextFireTime();
-    if (nextFireTime == 0.0 || nextFireTime > currentTime() + kMinIdleTimespan) {
-        bool hasMoreWork = !isolate()->IdleNotificationDeadline(Platform::current()->monotonicallyIncreasingTime() + 1.0);
-        if (hasMoreWork)
-            delay = kShortIdleHandlerDelayMs;
-    }
-
-    postDelayedTask(FROM_HERE, createSameThreadTask(&WorkerThread::idleHandler, this), delay);
-}
-
-void WorkerThread::postTask(const WebTraceLocation& location, PassOwnPtr<ExecutionContextTask> task)
-{
-    backingThread().postTask(location, WorkerThreadTask::create(*this, task, true).leakPtr());
-}
-
-void WorkerThread::postDelayedTask(const WebTraceLocation& location, PassOwnPtr<ExecutionContextTask> task, long long delayMs)
-{
-    backingThread().postDelayedTask(location, WorkerThreadTask::create(*this, task, true).leakPtr(), delayMs);
-}
-
-v8::Isolate* WorkerThread::initializeIsolate()
-{
-    ASSERT(isCurrentThread());
-    ASSERT(!m_isolate);
-    v8::Isolate* isolate = V8PerIsolateData::initialize();
-    V8Initializer::initializeWorker(isolate);
-
-    m_interruptor = adoptPtr(new V8IsolateInterruptor(isolate));
-    ThreadState::current()->addInterruptor(m_interruptor.get());
-    ThreadState::current()->registerTraceDOMWrappers(isolate, V8GCController::traceDOMWrappers);
-
-    return isolate;
-}
-
-void WorkerThread::willDestroyIsolate()
-{
-    ASSERT(isCurrentThread());
-    ASSERT(m_isolate);
-    V8PerIsolateData::willBeDestroyed(m_isolate);
-    ThreadState::current()->removeInterruptor(m_interruptor.get());
-}
-
-void WorkerThread::destroyIsolate()
-{
-    ASSERT(isCurrentThread());
-    V8PerIsolateData::destroy(m_isolate);
-    m_isolate = nullptr;
-}
-
-void WorkerThread::terminateV8Execution()
-{
-    ASSERT(isMainThread());
-    m_workerGlobalScope->script()->willScheduleExecutionTermination();
-    v8::V8::TerminateExecution(m_isolate);
-}
-
-void WorkerThread::postDebuggerTask(const WebTraceLocation& location, PassOwnPtr<ExecutionContextTask> task)
-{
-    m_debuggerMessageQueue.append(WorkerThreadTask::create(*this, task, false));
-    postTask(location, RunDebuggerQueueTask::create(this));
-}
-
-MessageQueueWaitResult WorkerThread::runDebuggerTask(WaitMode waitMode)
-{
-    ASSERT(isCurrentThread());
-    MessageQueueWaitResult result;
-    double absoluteTime = MessageQueue<WebThread::Task>::infiniteTime();
-    OwnPtr<WebThread::Task> task;
-    {
-        if (waitMode == DontWaitForMessage)
-            absoluteTime = 0.0;
-        SafePointScope safePointScope(ThreadState::NoHeapPointersOnStack);
-        task = m_debuggerMessageQueue.waitForMessageWithTimeout(result, absoluteTime);
-    }
-
-    if (result == MessageQueueMessageReceived) {
-        InspectorInstrumentation::willProcessTask(workerGlobalScope());
-        task->run();
-        InspectorInstrumentation::didProcessTask(workerGlobalScope());
-    }
-
-    return result;
-}
-
-void WorkerThread::willEnterNestedLoop()
-{
-    InspectorInstrumentation::willEnterNestedRunLoop(m_workerGlobalScope.get());
-}
-
-void WorkerThread::didLeaveNestedLoop()
-{
-    InspectorInstrumentation::didLeaveNestedRunLoop(m_workerGlobalScope.get());
-}
-
-void WorkerThread::setWorkerInspectorController(WorkerInspectorController* workerInspectorController)
-{
-    MutexLocker locker(m_workerInspectorControllerMutex);
-    m_workerInspectorController = workerInspectorController;
-}
-
-} // namespace blink