WorkerScriptController.h   [plain text]

/*
 * Copyright (C) 2009, 2012 Google Inc. All rights reserved.
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#ifndef WorkerScriptController_h
#define WorkerScriptController_h

#if ENABLE(WORKERS)

#include "ScopedDOMDataStore.h"
#include "V8Binding.h"

#include <v8.h>
#include <wtf/OwnPtr.h>
#include <wtf/Threading.h>

namespace WebCore {

    class ScriptSourceCode;
    class ScriptValue;
    class WorkerContext;
    class WorkerContextExecutionProxy;

    class WorkerScriptController {
    public:
        WorkerScriptController(WorkerContext*);
        ~WorkerScriptController();

        WorkerContextExecutionProxy* proxy() { return m_proxy.get(); }
        WorkerContext* workerContext() { return m_workerContext; }

        void evaluate(const ScriptSourceCode&);
        void evaluate(const ScriptSourceCode&, ScriptValue* exception);

        void setException(ScriptValue);

        // Async request to terminate a future JS execution. Eventually causes termination
        // exception raised during JS execution, if the worker thread happens to run JS.
        // After JS execution was terminated in this way, the Worker thread has to use
        // forbidExecution()/isExecutionForbidden() to guard against reentry into JS.
        // Can be called from any thread.
        void scheduleExecutionTermination();
        bool isExecutionTerminating() const;

        // Called on Worker thread when JS exits with termination exception caused by forbidExecution() request,
        // or by Worker thread termination code to prevent future entry into JS.
        void forbidExecution();
        bool isExecutionForbidden() const;

        void disableEval();

        // Returns WorkerScriptController for the currently executing context. 0 will be returned if the current executing context is not the worker context.
        static WorkerScriptController* controllerForContext();

    private:
        WorkerContext* m_workerContext;
        OwnPtr<WorkerContextExecutionProxy> m_proxy;
        v8::Isolate* m_isolate;
        ScopedDOMDataStore m_DOMDataStore;
        bool m_executionForbidden;
        bool m_executionScheduledToTerminate;
        mutable Mutex m_scheduledTerminationMutex;
    };

} // namespace WebCore

#endif // ENABLE(WORKERS)

#endif // WorkerScriptController_h