root/Source/bindings/v8/ScriptState.h

INCLUDED FROM

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 * notice, this list of conditions and the following disclaimer.
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 * in the documentation and/or other materials provided with the
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 */

#ifndef ScriptState_h
#define ScriptState_h

#include "bindings/v8/ScopedPersistent.h"
#include <v8.h>
#include "wtf/Noncopyable.h"

namespace WebCore {

class DOMWindow;
class DOMWrapperWorld;
class LocalFrame;
class ExecutionContext;
class WorkerGlobalScope;

// FIXME: ScriptState is deprecated and going to be removed. Use NewScriptState instead.
class ScriptState {
    WTF_MAKE_NONCOPYABLE(ScriptState);
public:
    bool hadException() { return !m_exception.isEmpty(); }
    void setException(v8::Local<v8::Value> exception)
    {
        m_exception.set(m_isolate, exception);
    }
    v8::Local<v8::Value> exception() { return m_exception.newLocal(m_isolate); }
    void clearException() { m_exception.clear(); }

    v8::Local<v8::Context> context() const
    {
        return m_context.newLocal(m_isolate);
    }

    v8::Isolate* isolate()
    {
        return m_isolate;
    }

    DOMWindow* domWindow() const;
    ExecutionContext* executionContext() const;
    bool evalEnabled() const;
    void setEvalEnabled(bool);

    static ScriptState* forContext(v8::Handle<v8::Context>);
    static ScriptState* current();

protected:
    ScriptState()
        : m_isolate(v8::Isolate::GetCurrent())
    {
    }

    ~ScriptState();

private:
    friend ScriptState* mainWorldScriptState(LocalFrame*);
    explicit ScriptState(v8::Handle<v8::Context>);

    static void setWeakCallback(const v8::WeakCallbackData<v8::Context, ScriptState>&);

    ScopedPersistent<v8::Value> m_exception;
    ScopedPersistent<v8::Context> m_context;
    v8::Isolate* m_isolate;
};

class ScriptStateProtectedPtr {
    WTF_MAKE_NONCOPYABLE(ScriptStateProtectedPtr);
public:
    ScriptStateProtectedPtr()
        : m_scriptState(0)
    {
    }

    ScriptStateProtectedPtr(ScriptState* scriptState)
        : m_scriptState(scriptState)
    {
        v8::HandleScope handleScope(scriptState->isolate());
        // Keep the context from being GC'ed. ScriptState is guaranteed to be live while the context is live.
        m_context.set(scriptState->isolate(), scriptState->context());
    }

    ScriptState* get() const { return m_scriptState; }

private:
    ScriptState* m_scriptState;
    ScopedPersistent<v8::Context> m_context;
};

ScriptState* mainWorldScriptState(LocalFrame*);

ScriptState* scriptStateFromWorkerGlobalScope(WorkerGlobalScope*);

}

#endif // ScriptState_h