diff -r 000000000000 -r 4f2f89ce4247 WebCore/bindings/v8/V8DOMWindowShell.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/WebCore/bindings/v8/V8DOMWindowShell.h	Fri Sep 17 09:02:29 2010 +0300
@@ -0,0 +1,121 @@
+/*
+ * Copyright (C) 2009 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:
+ * 
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * 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.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
+ * OWNER OR 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 V8DOMWindowShell_h
+#define V8DOMWindowShell_h
+
+#include "WrapperTypeInfo.h"
+#include <wtf/HashMap.h>
+#include <wtf/PassRefPtr.h>
+#include <wtf/RefCounted.h>
+#include <wtf/RefPtr.h>
+
+namespace WebCore {
+
+class DOMWindow;
+class Frame;
+class String;
+
+// V8WindowShell represents all the per-global object state for a Frame that
+// persist between navigations.
+class V8DOMWindowShell : public RefCounted<V8DOMWindowShell> {
+public:
+    static PassRefPtr<V8DOMWindowShell> create(Frame*);
+
+    v8::Handle<v8::Context> context() const { return m_context; }
+
+    // Update document object of the frame.
+    void updateDocument();
+
+    // Update the security origin of a document
+    // (e.g., after setting docoument.domain).
+    void updateSecurityOrigin();
+
+    bool isContextInitialized();
+
+    v8::Persistent<v8::Context> createNewContext(v8::Handle<v8::Object> global, int extensionGroup);
+    void setContext(v8::Handle<v8::Context>);
+    static bool installDOMWindow(v8::Handle<v8::Context> context, DOMWindow*);
+
+    void initContextIfNeeded();
+    void updateDocumentWrapper(v8::Handle<v8::Object> wrapper);
+
+    void clearForNavigation();
+    void clearForClose();
+
+    void destroyGlobal();
+
+    static v8::Handle<v8::Value> getHiddenObjectPrototype(v8::Handle<v8::Context>);
+    // WARNING: Call |installHiddenObjectPrototype| only on fresh contexts!
+    static bool installHiddenObjectPrototype(v8::Handle<v8::Context>);
+
+    // To create JS Wrapper objects, we create a cache of a 'boiler plate'
+    // object, and then simply Clone that object each time we need a new one.
+    // This is faster than going through the full object creation process.
+    v8::Local<v8::Object> createWrapperFromCache(WrapperTypeInfo* type)
+    {
+        v8::Persistent<v8::Object> boilerplate = m_wrapperBoilerplates.get(type);
+        return boilerplate.IsEmpty() ? createWrapperFromCacheSlowCase(type) : boilerplate->Clone();
+    }
+
+    static void setLocation(DOMWindow*, const String& relativeURL);
+
+private:
+    V8DOMWindowShell(Frame*);
+
+    void disposeContextHandles();
+
+    void setSecurityToken();
+    void clearDocumentWrapper();
+
+    // The JavaScript wrapper for the document object is cached on the global
+    // object for fast access. UpdateDocumentWrapperCache sets the wrapper
+    // for the current document on the global object. ClearDocumentWrapperCache
+    // deletes the document wrapper from the global object.
+    void updateDocumentWrapperCache();
+    void clearDocumentWrapperCache();
+
+    v8::Local<v8::Object> createWrapperFromCacheSlowCase(WrapperTypeInfo*);
+
+    Frame* m_frame;
+
+    // For each possible type of wrapper, we keep a boilerplate object.
+    // The boilerplate is used to create additional wrappers of the same type.
+    typedef WTF::HashMap<WrapperTypeInfo*, v8::Persistent<v8::Object> > WrapperBoilerplateMap;
+    WrapperBoilerplateMap m_wrapperBoilerplates;
+
+    v8::Persistent<v8::Context> m_context;
+    v8::Persistent<v8::Object> m_global;
+    v8::Persistent<v8::Object> m_document;
+};
+
+} // namespace WebCore
+
+#endif // V8DOMWindowShell_h