/platform/external/webkit/WebCore/bindings/v8/WorkerContextExecutionProxy.h

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  9 * notice, this list of conditions and the following disclaimer.
 10 *     * Redistributions in binary form must reproduce the above
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 12 * in the documentation and/or other materials provided with the
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 29 */
 30
 31
 32#ifndef WorkerContextExecutionProxy_h
 33#define WorkerContextExecutionProxy_h
 34
 35#if ENABLE(WORKERS)
 36
 37#include "ScriptValue.h"
 38#include "V8EventListenerList.h"
 39#include "V8Index.h"
 40#include <v8.h>
 41#include <wtf/OwnPtr.h>
 42#include <wtf/Vector.h>
 43
 44namespace WebCore {
 45
 46    class Event;
 47    class EventTarget;
 48    class V8EventListener;
 49    class V8WorkerContextEventListener;
 50    class WorkerContext;
 51
 52    struct WorkerContextExecutionState {
 53        WorkerContextExecutionState() : hadException(false), lineNumber(0) { }
 54
 55        bool hadException;
 56        ScriptValue exception;
 57        String errorMessage;
 58        int lineNumber;
 59        String sourceURL;
 60    };
 61
 62    class WorkerContextExecutionProxy {
 63    public:
 64        WorkerContextExecutionProxy(WorkerContext*);
 65        ~WorkerContextExecutionProxy();
 66
 67        // Finds/creates event listener wrappers.
 68        PassRefPtr<V8EventListener> findOrCreateEventListener(v8::Local<v8::Value> listener, bool isInline, bool findOnly);
 69
 70        // Track the event so that we can detach it from the JS wrapper when a worker
 71        // terminates. This is needed because we need to be able to dispose these
 72        // events and releases references to their event targets: WorkerContext.
 73        void trackEvent(Event*);
 74
 75        // Evaluate a script file in the current execution environment.
 76        ScriptValue evaluate(const String& script, const String& fileName, int baseLine, WorkerContextExecutionState*);
 77
 78        // Returns a local handle of the context.
 79        v8::Local<v8::Context> context() { return v8::Local<v8::Context>::New(m_context); }
 80
 81        // Returns WorkerContext object.
 82        WorkerContext* workerContext() { return m_workerContext; }
 83
 84        // Returns WorkerContextExecutionProxy object of the currently executing context. 0 will be returned if the current executing context is not the worker context.
 85        static WorkerContextExecutionProxy* retrieve();
 86
 87    private:
 88        void initV8IfNeeded();
 89        void initContextIfNeeded();
 90        void dispose();
 91
 92        // Run an already compiled script.
 93        v8::Local<v8::Value> runScript(v8::Handle<v8::Script>);
 94
 95        static bool forgetV8EventObject(Event*);
 96
 97        static const int kWorkerMaxStackSize = 500 * 1024;
 98
 99        WorkerContext* m_workerContext;
100        v8::Persistent<v8::Context> m_context;
101        int m_recursion;
102
103        Vector<Event*> m_events;
104    };
105
106} // namespace WebCore
107
108#endif // ENABLE(WORKERS)
109
110#endif // WorkerContextExecutionProxy_h