Implement ScriptPromise and ScriptFunction

Source/bindings/v8/GarbageCollected.h

Index: Source/bindings/v8/GarbageCollected.h
diff --git a/Source/bindings/v8/SharedPersistent.h b/Source/bindings/v8/GarbageCollected.h
similarity index 59%
copy from Source/bindings/v8/SharedPersistent.h
copy to Source/bindings/v8/GarbageCollected.h
index 52cc1196f348e14168c6fbaf9332d475d76e5055..c21f421fac2b3ce52c0818d9b71de753bce0188d 100644
--- a/Source/bindings/v8/SharedPersistent.h
+++ b/Source/bindings/v8/GarbageCollected.h
@@ -28,42 +28,51 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#ifndef SharedPersistent_h
-#define SharedPersistent_h
+#ifndef GarbageCollected_h
+#define GarbageCollected_h
 
 #include "bindings/v8/ScopedPersistent.h"
-#include <v8.h>
-#include "wtf/PassRefPtr.h"
-#include "wtf/RefCounted.h"
 
 namespace WebCore {
 
-    template <typename T>
-    class SharedPersistent : public RefCounted<SharedPersistent<T> > {
-    WTF_MAKE_NONCOPYABLE(SharedPersistent);
-    public:
-        static PassRefPtr<SharedPersistent<T> > create(v8::Handle<T> value)
-        {
-            return adoptRef(new SharedPersistent<T>(value));
-        }
+template<typename T>
+class GarbageCollected {
+    WTF_MAKE_NONCOPYABLE(GarbageCollected);
+public:
+    static T* Cast(v8::Handle<v8::Value> value)
+    {
+        ASSERT(value->IsExternal());
+        T* result = static_cast<T*>(value.As<v8::External>()->Value());
+        RELEASE_ASSERT(result->m_handle == value);
+        return result;
+    }
 
-        v8::Local<T> newLocal(v8::Isolate* isolate) const
-        {
-            return m_value.newLocal(isolate);
-        }
+protected:
+    GarbageCollected() : m_handle(v8::External::New(static_cast<T*>(this))) { }
 
-        bool isEmpty() { return m_value.isEmpty(); }
+    v8::Handle<v8::External> releaseToGarbageCollector()
+    {
+        ASSERT(!m_handle.isWeak()); // Call releaseToGarbageCollector exactly once.
+        v8::Handle<v8::External> result = m_handle.newLocal(v8::Isolate::GetCurrent());
+        m_handle.makeWeak(static_cast<T*>(this), weakCallback);
+        return result;
+    }
 
-        bool operator==(const SharedPersistent<T>& other)
-        {
-            return m_value == other.m_value;
-        }
+    ~GarbageCollected()
+    {
+        ASSERT(m_handle.isEmpty());
+    }
 
-    private:
-        explicit SharedPersistent(v8::Handle<T> value) : m_value(value) { }
-        ScopedPersistent<T> m_value;
-    };
+private:
+    static void weakCallback(v8::Isolate* isolate, v8::Persistent<v8::External>* handle, T* self)
+    {
+        self->m_handle.clear();
+        delete self;
+    }
+
+    ScopedPersistent<v8::External> m_handle;
+};
 
 } // namespace WebCore
 
-#endif // SharedPersistent_h
+#endif // GarbageCollected_h