[ABANDONED] Implement ThenableCoercions for AP2 Promises

Source/bindings/v8/ThenableCoercions.h

Index: Source/bindings/v8/ThenableCoercions.h
diff --git a/Source/bindings/v8/ThenableCoercions.h b/Source/bindings/v8/ThenableCoercions.h
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+/*
+ * Copyright (C) 2013, Google 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 INC. AND ITS CONTRIBUTORS ``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 INC. OR ITS 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.
+ */
+
+#ifndef ThenableCoercions_h
+#define ThenableCoercions_h
+
+#include "bindings/v8/ScopedPersistent.h"
+#include "wtf/Assertions.h"
+#include "wtf/DoublyLinkedList.h"
+#include "wtf/Noncopyable.h"
+#include "wtf/PassOwnPtr.h"
+#include "wtf/Vector.h"
+
+#include <v8.h>
+
+namespace WebCore {
+
+class ThenableCoercions {
+    WTF_MAKE_NONCOPYABLE(ThenableCoercions);
+public:
+    static PassOwnPtr<ThenableCoercions> create();
+
+    ~ThenableCoercions();
+
+    bool has(v8::Handle<v8::Object> thenable);
+    v8::Handle<v8::Object> get(v8::Handle<v8::Object> thenable);
+    void set(v8::Handle<v8::Object> thenable, v8::Handle<v8::Object> promise, v8::Isolate*);
+
+private:
+    ThenableCoercions();
+
+    class Entry : public DoublyLinkedListNode<Entry> {
+        WTF_MAKE_NONCOPYABLE(Entry);
+        friend class DoublyLinkedListNode<Entry>;
+    public:
+        static Entry* create(v8::Handle<v8::Object> thenable, v8::Handle<v8::Object> promise, ThenableCoercions* thenableCoercions, v8::Isolate* isolate)
+        {
+            return new Entry(thenable, promise, thenableCoercions, isolate);
+        }
+
+        v8::Local<v8::Object> thenable()
+        {
+            return m_thenable.newLocal(m_isolate);
+        }
+
+        v8::Local<v8::Object> promise()
+        {
+            return m_promise.newLocal(m_isolate);
+        }
+
+    private:
+        Entry(v8::Handle<v8::Object> thenable, v8::Handle<v8::Object> promise, ThenableCoercions*, v8::Isolate*);
+
+        static void makeWeakCallback(v8::Isolate*, v8::Persistent<v8::Object>* thenable, Entry*);
+
+        Entry* m_next;
+        Entry* m_prev;
+        ScopedPersistent<v8::Object> m_thenable;
+        ScopedPersistent<v8::Object> m_promise;
+        ThenableCoercions* m_thenableCoercions;
+        v8::Isolate* m_isolate;
+    };
+
+    class GuardEntriesListAgainstGC {
+        WTF_MAKE_NONCOPYABLE(GuardEntriesListAgainstGC);
+    public:
+        GuardEntriesListAgainstGC(ThenableCoercions*);
+        ~GuardEntriesListAgainstGC();
+
+    private:
+        ThenableCoercions* m_thenableCoercions;
+    };
+
+    friend class Entry;
+    friend class GuardEntriesListAgainstGC;
+
+    void tryToDelete(Entry*);
+    void deleteInternal(Entry*);
+
+    DoublyLinkedList<Entry> m_entries;
+    Vector<Entry*> m_entriesToDelete;
+    bool m_entriesListGuarded : 1;
+};
+
+} // namespace WebCore
+
+#endif // ThenableCoercions_h