diff -r 000000000000 -r 4f2f89ce4247 WebCore/bindings/v8/ScriptState.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/WebCore/bindings/v8/ScriptState.h	Fri Sep 17 09:02:29 2010 +0300
@@ -0,0 +1,114 @@
+/*
+ * Copyright (C) 2008, 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 ScriptState_h
+#define ScriptState_h
+
+#include "DOMWrapperWorld.h"
+#include <v8.h>
+#include <wtf/Noncopyable.h>
+#include <wtf/RefCounted.h>
+
+namespace WebCore {
+class DOMWrapperWorld;
+class Frame;
+class Node;
+class Page;
+
+class ScriptState : public Noncopyable {
+public:
+    bool hadException() { return !m_exception.IsEmpty(); }
+    void setException(v8::Local<v8::Value> exception)
+    {
+        m_exception = exception;
+    }
+    v8::Local<v8::Value> exception() { return m_exception; }
+
+    v8::Local<v8::Context> context() const
+    {
+        return v8::Local<v8::Context>::New(m_context);
+    }
+
+    static ScriptState* forContext(v8::Local<v8::Context>);
+    static ScriptState* current();
+
+protected:
+    ScriptState() { }
+    ~ScriptState();
+
+private:
+    friend ScriptState* mainWorldScriptState(Frame*);
+    explicit ScriptState(v8::Handle<v8::Context>);
+
+    static void weakReferenceCallback(v8::Persistent<v8::Value> object, void* parameter);
+
+    v8::Local<v8::Value> m_exception;
+    v8::Persistent<v8::Context> m_context;
+};
+
+class EmptyScriptState : public ScriptState {
+public:
+    EmptyScriptState() : ScriptState() { }
+    ~EmptyScriptState() { }
+};
+
+class ScriptStateProtectedPtr : public Noncopyable {
+public:
+    ScriptStateProtectedPtr() : m_scriptState(0) { }
+    ScriptStateProtectedPtr(ScriptState* scriptState) : m_scriptState(scriptState)
+    {
+        v8::HandleScope handleScope;
+        // Keep the context from being GC'ed. ScriptState is guaranteed to be live while the context is live.
+        m_context = v8::Persistent<v8::Context>::New(scriptState->context());
+    }
+    ~ScriptStateProtectedPtr()
+    {
+        if (!m_context.IsEmpty()) {
+            m_context.Dispose();
+            m_context.Clear();
+        }
+    }
+    ScriptState* get() { return m_scriptState; }
+private:
+    ScriptState* m_scriptState;
+    v8::Persistent<v8::Context> m_context;
+};
+
+ScriptState* mainWorldScriptState(Frame*);
+
+ScriptState* scriptStateFromNode(DOMWrapperWorld*, Node*);
+ScriptState* scriptStateFromPage(DOMWrapperWorld*, Page*);
+
+inline DOMWrapperWorld* debuggerWorld() { return mainThreadNormalWorld(); }
+inline DOMWrapperWorld* pluginWorld() { return mainThreadNormalWorld(); }
+
+}
+
+#endif // ScriptState_h