--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/WebCore/bindings/v8/ScriptState.cpp	Fri Sep 17 09:02:29 2010 +0300
@@ -0,0 +1,114 @@
+/*
+ * 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.
+ */
+
+#include "config.h"
+#include "ScriptState.h"
+
+#include "Frame.h"
+#include "Node.h"
+#include "Page.h"
+#include "ScriptController.h"
+#include "V8HiddenPropertyName.h"
+
+#include <v8.h>
+#include <wtf/Assertions.h>
+
+namespace WebCore {
+
+ScriptState::ScriptState(v8::Handle<v8::Context> context)
+    : m_context(v8::Persistent<v8::Context>::New(context))
+{
+    m_context.MakeWeak(this, &ScriptState::weakReferenceCallback);
+}
+
+ScriptState::~ScriptState()
+{
+    m_context.Dispose();
+    m_context.Clear();
+}
+
+ScriptState* ScriptState::forContext(v8::Local<v8::Context> context)
+{
+    v8::Context::Scope contextScope(context);
+
+    v8::Local<v8::Object> global = context->Global();
+    // Skip proxy object. The proxy object will survive page navigation while we need
+    // an object whose lifetime consides with that of the inspected context.
+    global = v8::Local<v8::Object>::Cast(global->GetPrototype());
+
+    v8::Handle<v8::String> key = V8HiddenPropertyName::scriptState();
+    v8::Local<v8::Value> val = global->GetHiddenValue(key);
+    if (!val.IsEmpty() && val->IsExternal())
+        return static_cast<ScriptState*>(v8::External::Cast(*val)->Value());
+
+    ScriptState* state = new ScriptState(context);
+    global->SetHiddenValue(key, v8::External::New(state));
+    return state;
+}
+
+ScriptState* ScriptState::current()
+{
+    v8::HandleScope handleScope;
+    v8::Local<v8::Context> context = v8::Context::GetCurrent();
+    if (context.IsEmpty()) {
+        ASSERT_NOT_REACHED();
+        return 0;
+    }
+    return ScriptState::forContext(context);
+}
+
+void ScriptState::weakReferenceCallback(v8::Persistent<v8::Value> object, void* parameter)
+{
+    ScriptState* scriptState = static_cast<ScriptState*>(parameter);
+    delete scriptState;
+}
+
+ScriptState* mainWorldScriptState(Frame* frame)
+{
+    v8::HandleScope handleScope;
+    V8Proxy* proxy = frame->script()->proxy();
+    return ScriptState::forContext(proxy->mainWorldContext());
+}
+
+ScriptState* scriptStateFromNode(DOMWrapperWorld*, Node* node)
+{
+    // This should be never reached with V8 bindings (WebKit only uses it
+    // for non-JS bindings)
+    ASSERT_NOT_REACHED();
+    return 0;
+}
+
+ScriptState* scriptStateFromPage(DOMWrapperWorld*, Page* page)
+{
+    // This should be only reached with V8 bindings from single process layout tests.
+    return mainWorldScriptState(page->mainFrame());
+}
+
+}