Imported WebKit commit 3a8c29f35d00659d2ce7a0ccdfa8304f14e82327 (http://svn.webkit.org/repository/webkit/trunk@120813)

New snapshot with Windows build fixes

38 files changed, 219 insertions, 141 deletions

diff --git a/Source/WebCore/bindings/js/DOMObjectHashTableMap.h b/Source/WebCore/bindings/js/DOMObjectHashTableMap.h
index 216b945c4..64828d698 100644
--- a/Source/WebCore/bindings/js/DOMObjectHashTableMap.h
+++ b/Source/WebCore/bindings/js/DOMObjectHashTableMap.h
@@ -47,7 +47,7 @@ public:
         HashMap<const JSC::HashTable*, JSC::HashTable>::iterator iter = m_map.find(staticTable);
         if (iter != m_map.end())
             return &iter->second;
-        return &m_map.set(staticTable, JSC::HashTable(*staticTable)).iterator->second;
+        return &m_map.set(staticTable, staticTable->copy()).iterator->second;
     }
 
 private:
diff --git a/Source/WebCore/bindings/js/DOMWrapperWorld.h b/Source/WebCore/bindings/js/DOMWrapperWorld.h
index 755375d65..9b83264d8 100644
--- a/Source/WebCore/bindings/js/DOMWrapperWorld.h
+++ b/Source/WebCore/bindings/js/DOMWrapperWorld.h
@@ -34,7 +34,7 @@ class JSDOMWrapper;
 class ScriptController;
 
 typedef HashMap<void*, JSC::Weak<JSDOMWrapper> > DOMObjectWrapperMap;
-typedef HashMap<StringImpl*, JSC::Weak<JSC::JSString> > JSStringCache;
+typedef HashMap<StringImpl*, JSC::Weak<JSC::JSString>, PtrHash<StringImpl*> > JSStringCache;
 
 class JSStringOwner : public JSC::WeakHandleOwner {
 public:
diff --git a/Source/WebCore/bindings/js/Dictionary.cpp b/Source/WebCore/bindings/js/Dictionary.cpp
index 81b345d48..ba960dc82 100644
--- a/Source/WebCore/bindings/js/Dictionary.cpp
+++ b/Source/WebCore/bindings/js/Dictionary.cpp
@@ -79,5 +79,9 @@ bool Dictionary::getOwnPropertiesAsStringHashMap(WTF::HashMap<String, String>& m
     return true;
 }
 
-};
+bool Dictionary::getWithUndefinedOrNullCheck(const String& propertyName, String& value) const
+{
+    return m_dictionary.getWithUndefinedOrNullCheck(propertyName, value);
+}
 
+};
diff --git a/Source/WebCore/bindings/js/Dictionary.h b/Source/WebCore/bindings/js/Dictionary.h
index ccceee706..37c3e8806 100644
--- a/Source/WebCore/bindings/js/Dictionary.h
+++ b/Source/WebCore/bindings/js/Dictionary.h
@@ -61,7 +61,7 @@ public:
     bool isObject() const { return m_dictionary.isValid(); }
     bool isUndefinedOrNull() const { return !m_dictionary.isValid(); }
     bool getOwnPropertiesAsStringHashMap(WTF::HashMap<String, String>&) const;
-    bool getWithUndefinedOrNullCheck(const String&, String&) const { notImplemented(); return false; }
+    bool getWithUndefinedOrNullCheck(const String& propertyName, String& value) const;
 
 private:
     template <typename T>
diff --git a/Source/WebCore/bindings/js/GCController.cpp b/Source/WebCore/bindings/js/GCController.cpp
index 2e304cb85..96dadf373 100644
--- a/Source/WebCore/bindings/js/GCController.cpp
+++ b/Source/WebCore/bindings/js/GCController.cpp
@@ -105,7 +105,7 @@ void GCController::setJavaScriptGarbageCollectorTimerEnabled(bool enable)
 void GCController::discardAllCompiledCode()
 {
     JSLock lock(SilenceAssertionsOnly);
-    JSDOMWindow::commonJSGlobalData()->heap.discardAllCompiledCode();
+    JSDOMWindow::commonJSGlobalData()->heap.deleteAllCompiledCode();
 }
 
 } // namespace WebCore
diff --git a/Source/WebCore/bindings/js/JSBindingsAllInOne.cpp b/Source/WebCore/bindings/js/JSBindingsAllInOne.cpp
index 4d936393e..66b4a7f43 100644
--- a/Source/WebCore/bindings/js/JSBindingsAllInOne.cpp
+++ b/Source/WebCore/bindings/js/JSBindingsAllInOne.cpp
@@ -60,6 +60,7 @@
 #include "JSDOMMimeTypeArrayCustom.cpp"
 #include "JSDOMPluginArrayCustom.cpp"
 #include "JSDOMPluginCustom.cpp"
+#include "JSDOMStringListCustom.cpp"
 #include "JSDOMStringMapCustom.cpp"
 #include "JSDOMTokenListCustom.cpp"
 #include "JSDOMWindowBase.cpp"
@@ -77,7 +78,7 @@
 #include "JSErrorHandler.cpp"
 #include "JSEventCustom.cpp"
 #include "JSEventListener.cpp"
-#include "JSEventTarget.cpp"
+#include "JSEventTargetCustom.cpp"
 #include "JSExceptionBase.cpp"
 #include "JSFloat32ArrayCustom.cpp"
 #include "JSFloat64ArrayCustom.cpp"
diff --git a/Source/WebCore/bindings/js/JSBlobCustom.cpp b/Source/WebCore/bindings/js/JSBlobCustom.cpp
index 3392f3ce6..7384f73fc 100644
--- a/Source/WebCore/bindings/js/JSBlobCustom.cpp
+++ b/Source/WebCore/bindings/js/JSBlobCustom.cpp
@@ -35,6 +35,7 @@
 #include "ExceptionCode.h"
 #include "ExceptionCodePlaceholder.h"
 #include "JSArrayBuffer.h"
+#include "JSArrayBufferView.h"
 #include "JSDOMBinding.h"
 #include "JSDictionary.h"
 #include "JSFile.h"
@@ -53,9 +54,9 @@ JSValue toJS(ExecState* exec, JSDOMGlobalObject* globalObject, Blob* blob)
         return jsNull();
 
     if (blob->isFile())
-        return CREATE_DOM_WRAPPER(exec, globalObject, File, blob);
+        return wrap<JSFile>(exec, globalObject, static_cast<File*>(blob));
 
-    return CREATE_DOM_WRAPPER(exec, globalObject, Blob, blob);
+    return wrap<JSBlob>(exec, globalObject, blob);    
 }
 
 EncodedJSValue JSC_HOST_CALL JSBlobConstructor::constructJSBlob(ExecState* exec)
@@ -103,6 +104,9 @@ EncodedJSValue JSC_HOST_CALL JSBlobConstructor::constructJSBlob(ExecState* exec)
         dictionary.get("type", type);
         if (exec->hadException())
             return JSValue::encode(jsUndefined());
+        if (!type.containsOnlyASCII())
+            return throwVMError(exec, createSyntaxError(exec, "type must consist of ASCII characters"));
+        type.makeLower();
     }
 
     ASSERT(endings == "transparent" || endings == "native");
@@ -117,7 +121,9 @@ EncodedJSValue JSC_HOST_CALL JSBlobConstructor::constructJSBlob(ExecState* exec)
         JSValue item = array->getIndex(i);
 #if ENABLE(BLOB)
         if (item.inherits(&JSArrayBuffer::s_info))
-            blobBuilder->append(toArrayBuffer(item));
+            blobBuilder->append(context, toArrayBuffer(item));
+        else if (item.inherits(&JSArrayBufferView::s_info))
+            blobBuilder->append(toArrayBufferView(item));
         else
 #endif
         if (item.inherits(&JSBlob::s_info))
diff --git a/Source/WebCore/bindings/js/JSDOMBinding.cpp b/Source/WebCore/bindings/js/JSDOMBinding.cpp
index 3a6c64a05..fc179907a 100644
--- a/Source/WebCore/bindings/js/JSDOMBinding.cpp
+++ b/Source/WebCore/bindings/js/JSDOMBinding.cpp
@@ -22,6 +22,7 @@
 #include "JSDOMBinding.h"
 
 #include "DOMObjectHashTableMap.h"
+#include "DOMStringList.h"
 #include "ExceptionCode.h"
 #include "ExceptionHeaders.h"
 #include "ExceptionInterfaces.h"
@@ -146,6 +147,16 @@ double valueToDate(ExecState* exec, JSValue value)
     return static_cast<DateInstance*>(value.toObject(exec))->internalNumber();
 }
 
+JSC::JSValue jsArray(JSC::ExecState* exec, JSDOMGlobalObject* globalObject, PassRefPtr<DOMStringList> stringList)
+{
+    JSC::MarkedArgumentBuffer list;
+    if (stringList) {
+        for (unsigned i = 0; i < stringList->length(); ++i)
+            list.append(jsString(exec, stringList->item(i)));
+    }
+    return JSC::constructArray(exec, globalObject, list);
+}
+
 void reportException(ExecState* exec, JSValue exception)
 {
     if (isTerminatedExecutionException(exception))
diff --git a/Source/WebCore/bindings/js/JSDOMBinding.h b/Source/WebCore/bindings/js/JSDOMBinding.h
index 1be6310a8..d278a802a 100644
--- a/Source/WebCore/bindings/js/JSDOMBinding.h
+++ b/Source/WebCore/bindings/js/JSDOMBinding.h
@@ -44,6 +44,8 @@
 
 namespace WebCore {
 
+class DOMStringList;
+
 enum ParameterDefaultPolicy {
     DefaultIsUndefined,
     DefaultIsNullString
@@ -291,6 +293,8 @@ enum ParameterDefaultPolicy {
         return JSC::constructArray(exec, globalObject, list);
     }
 
+    JSC::JSValue jsArray(JSC::ExecState*, JSDOMGlobalObject*, PassRefPtr<DOMStringList>);
+
     template<>
     inline JSC::JSValue jsArray(JSC::ExecState* exec, JSDOMGlobalObject* globalObject, const Vector<String>& iterator)
     {
diff --git a/Source/WebCore/bindings/js/JSDOMGlobalObject.cpp b/Source/WebCore/bindings/js/JSDOMGlobalObject.cpp
index dbc274d23..36104808b 100644
--- a/Source/WebCore/bindings/js/JSDOMGlobalObject.cpp
+++ b/Source/WebCore/bindings/js/JSDOMGlobalObject.cpp
@@ -20,7 +20,7 @@
  * 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. 
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *
  */
 
@@ -93,9 +93,6 @@ void JSDOMGlobalObject::visitChildren(JSCell* cell, SlotVisitor& visitor)
     JSDOMConstructorMap::iterator end2 = thisObject->constructors().end();
     for (JSDOMConstructorMap::iterator it2 = thisObject->constructors().begin(); it2 != end2; ++it2)
         visitor.append(&it2->second);
-
-    if (thisObject->m_injectedScript)
-        visitor.append(&thisObject->m_injectedScript);
 }
 
 void JSDOMGlobalObject::setCurrentEvent(Event* currentEvent)
@@ -108,16 +105,6 @@ Event* JSDOMGlobalObject::currentEvent() const
     return m_currentEvent;
 }
 
-void JSDOMGlobalObject::setInjectedScript(JSObject* injectedScript)
-{
-    m_injectedScript.setMayBeNull(globalData(), this, injectedScript);
-}
-
-JSObject* JSDOMGlobalObject::injectedScript() const
-{
-    return m_injectedScript.get();
-}
-
 JSDOMGlobalObject* toJSDOMGlobalObject(Document* document, JSC::ExecState* exec)
 {
     return toJSDOMWindow(document->frame(), currentWorld(exec));
diff --git a/Source/WebCore/bindings/js/JSDOMGlobalObject.h b/Source/WebCore/bindings/js/JSDOMGlobalObject.h
index bd2773ae4..3ce12d10f 100644
--- a/Source/WebCore/bindings/js/JSDOMGlobalObject.h
+++ b/Source/WebCore/bindings/js/JSDOMGlobalObject.h
@@ -20,7 +20,7 @@
  * 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. 
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *
  */
 
@@ -68,9 +68,6 @@ namespace WebCore {
         void setCurrentEvent(Event*);
         Event* currentEvent() const;
 
-        void setInjectedScript(JSObject*);
-        JSObject* injectedScript() const;
-
         static void visitChildren(JSC::JSCell*, JSC::SlotVisitor&);
 
         DOMWrapperWorld* world() { return m_world.get(); }
@@ -88,7 +85,6 @@ namespace WebCore {
 
         Event* m_currentEvent;
         RefPtr<DOMWrapperWorld> m_world;
-        JSC::WriteBarrier<JSObject> m_injectedScript;
     };
 
     template<class ConstructorClass>
diff --git a/Source/WebCore/bindings/js/JSDOMStringListCustom.cpp b/Source/WebCore/bindings/js/JSDOMStringListCustom.cpp
new file mode 100644
index 000000000..7f8d5ec53
--- /dev/null
+++ b/Source/WebCore/bindings/js/JSDOMStringListCustom.cpp
@@ -0,0 +1,42 @@
+/*
+ *  Copyright (C) 2012 Research In Motion Inc. All rights reserved.
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Lesser General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2 of the License, or (at your option) any later version.
+ *
+ *  This library is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *  Lesser General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public
+ *  License along with this library; if not, write to the Free Software
+ *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#include "config.h"
+#include "JSDOMStringList.h"
+
+using namespace JSC;
+
+namespace WebCore {
+
+PassRefPtr<DOMStringList> toDOMStringList(ExecState* exec, JSValue value)
+{
+    if (value.inherits(&JSDOMStringList::s_info))
+        return jsCast<JSDOMStringList*>(asObject(value))->impl();
+
+    if (!isJSArray(value))
+        return 0;
+
+    JSArray* array = asArray(value);
+    RefPtr<DOMStringList> stringList = DOMStringList::create();
+    for (unsigned i = 0; i < array->length(); ++i)
+        stringList->append(ustringToString(array->getIndex(i).toString(exec)->value(exec)));
+
+    return stringList.release();
+}
+
+} // namespace WebCore
diff --git a/Source/WebCore/bindings/js/JSDOMWindowBase.cpp b/Source/WebCore/bindings/js/JSDOMWindowBase.cpp
index 1ea8c8b44..f18a05e3b 100644
--- a/Source/WebCore/bindings/js/JSDOMWindowBase.cpp
+++ b/Source/WebCore/bindings/js/JSDOMWindowBase.cpp
@@ -74,7 +74,7 @@ void JSDOMWindowBase::updateDocument()
 {
     ASSERT(m_impl->document());
     ExecState* exec = globalExec();
-    symbolTablePutWithAttributes(exec->globalData(), Identifier(exec, "document"), toJS(exec, this, m_impl->document()), DontDelete | ReadOnly);
+    symbolTablePutWithAttributes(this, exec->globalData(), Identifier(exec, "document"), toJS(exec, this, m_impl->document()), DontDelete | ReadOnly);
 }
 
 ScriptExecutionContext* JSDOMWindowBase::scriptExecutionContext() const
diff --git a/Source/WebCore/bindings/js/JSDictionary.cpp b/Source/WebCore/bindings/js/JSDictionary.cpp
index fc6a16d93..4967107df 100644
--- a/Source/WebCore/bindings/js/JSDictionary.cpp
+++ b/Source/WebCore/bindings/js/JSDictionary.cpp
@@ -102,6 +102,24 @@ void JSDictionary::convertValue(ExecState* exec, JSValue value, String& result)
     result = ustringToString(value.toString(exec)->value(exec));
 }
 
+void JSDictionary::convertValue(ExecState* exec, JSValue value, Vector<String>& result)
+{
+    if (value.isUndefinedOrNull())
+        return;
+
+    unsigned length;
+    JSObject* object = toJSSequence(exec, value, length);
+    if (exec->hadException())
+        return;
+
+    for (unsigned i = 0 ; i < length; ++i) {
+        JSValue itemValue = object->get(exec, i);
+        if (exec->hadException())
+            return;
+        result.append(ustringToString(itemValue.toString(exec)->value(exec)));
+    }
+}
+
 void JSDictionary::convertValue(ExecState* exec, JSValue value, ScriptValue& result)
 {
     result = ScriptValue(exec->globalData(), value);
@@ -167,4 +185,14 @@ void JSDictionary::convertValue(ExecState* exec, JSValue value, HashSet<AtomicSt
 }
 #endif
 
+bool JSDictionary::getWithUndefinedOrNullCheck(const String& propertyName, String& result) const
+{
+    JSValue value;
+    if (tryGetProperty(propertyName.utf8().data(), value) != PropertyFound || value.isUndefinedOrNull())
+        return false;
+
+    result = ustringToString(value.toString(m_exec)->value(m_exec));
+    return true;
+}
+
 } // namespace WebCore
diff --git a/Source/WebCore/bindings/js/JSDictionary.h b/Source/WebCore/bindings/js/JSDictionary.h
index e0ba16997..bd1754dd8 100644
--- a/Source/WebCore/bindings/js/JSDictionary.h
+++ b/Source/WebCore/bindings/js/JSDictionary.h
@@ -58,6 +58,7 @@ public:
     // Returns true if the property was found in the dictionary, and the value could be converted to the desired type.
     template <typename Result>
     bool get(const char* propertyName, Result&) const;
+    bool getWithUndefinedOrNullCheck(const String& propertyName, String& value) const;
 
     JSC::ExecState* execState() const { return m_exec; }
     JSC::JSObject* initializerObject() const { return m_initializerObject; }
@@ -91,6 +92,7 @@ private:
     static void convertValue(JSC::ExecState*, JSC::JSValue, Dictionary& result);
     static void convertValue(JSC::ExecState*, JSC::JSValue, String& result);
     static void convertValue(JSC::ExecState*, JSC::JSValue, ScriptValue& result);
+    static void convertValue(JSC::ExecState*, JSC::JSValue, Vector<String>& result);
     static void convertValue(JSC::ExecState*, JSC::JSValue, RefPtr<SerializedScriptValue>& result);
     static void convertValue(JSC::ExecState*, JSC::JSValue, RefPtr<DOMWindow>& result);
     static void convertValue(JSC::ExecState*, JSC::JSValue, RefPtr<EventTarget>& result);
diff --git a/Source/WebCore/bindings/js/JSEventTarget.h b/Source/WebCore/bindings/js/JSEventTarget.h
deleted file mode 100644
index ddd823241..000000000
--- a/Source/WebCore/bindings/js/JSEventTarget.h
+++ /dev/null
@@ -1,45 +0,0 @@
-/*
- * Copyright (C) 2008 Apple 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. ``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
- * 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 JSEventTarget_h
-#define JSEventTarget_h
-
-#include <runtime/JSValue.h>
-
-namespace JSC {
-    class ExecState;
-}
-
-namespace WebCore {
-
-    class EventTarget;
-    class JSDOMGlobalObject;
-
-    JSC::JSValue toJS(JSC::ExecState*, JSDOMGlobalObject*, EventTarget*);
-    EventTarget* toEventTarget(JSC::JSValue);
-
-} // namespace WebCore
-
-#endif // JSEventTarget_h
diff --git a/Source/WebCore/bindings/js/JSEventTarget.cpp b/Source/WebCore/bindings/js/JSEventTargetCustom.cpp
index 66e157615..66e157615 100644
--- a/Source/WebCore/bindings/js/JSEventTarget.cpp
+++ b/Source/WebCore/bindings/js/JSEventTargetCustom.cpp
diff --git a/Source/WebCore/bindings/js/JSHTMLAllCollectionCustom.cpp b/Source/WebCore/bindings/js/JSHTMLAllCollectionCustom.cpp
index 7b106ba9d..8546729f4 100644
--- a/Source/WebCore/bindings/js/JSHTMLAllCollectionCustom.cpp
+++ b/Source/WebCore/bindings/js/JSHTMLAllCollectionCustom.cpp
@@ -28,7 +28,6 @@
 
 #include "HTMLAllCollection.h"
 #include "JSDOMBinding.h"
-#include "JSHTMLAllCollection.h"
 #include "JSNode.h"
 #include "JSNodeList.h"
 #include "Node.h"
diff --git a/Source/WebCore/bindings/js/JSHTMLCanvasElementCustom.cpp b/Source/WebCore/bindings/js/JSHTMLCanvasElementCustom.cpp
index d5fc3ce96..a72af1062 100644
--- a/Source/WebCore/bindings/js/JSHTMLCanvasElementCustom.cpp
+++ b/Source/WebCore/bindings/js/JSHTMLCanvasElementCustom.cpp
@@ -21,7 +21,7 @@
  * 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. 
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "config.h"
@@ -31,7 +31,9 @@
 #include "HTMLCanvasElement.h"
 #include "JSCanvasRenderingContext2D.h"
 #if ENABLE(WEBGL)
+#include "InspectorWebGLInstrumentation.h"
 #include "JSWebGLRenderingContext.h"
+#include "ScriptObject.h"
 #include "WebGLContextAttributes.h"
 #endif
 #include <wtf/GetPtr.h>
@@ -75,7 +77,16 @@ JSValue JSHTMLCanvasElement::getContext(ExecState* exec)
     CanvasRenderingContext* context = canvas->getContext(ustringToString(contextId), attrs.get());
     if (!context)
         return jsNull();
-    return toJS(exec, globalObject(), WTF::getPtr(context));
+    JSValue jsValue = toJS(exec, globalObject(), WTF::getPtr(context));
+#if ENABLE(WEBGL)
+    if (context->is3d() && InspectorInstrumentation::hasFrontends()) {
+        ScriptObject glContext(exec, jsValue.getObject());
+        ScriptObject wrapped = InspectorInstrumentation::wrapWebGLRenderingContextForInstrumentation(canvas->document(), glContext);
+        if (!wrapped.hasNoValue())
+            return wrapped.jsValue();
+    }
+#endif
+    return jsValue;
 }
 
 JSValue JSHTMLCanvasElement::toDataURL(ExecState* exec)
@@ -93,7 +104,7 @@ JSValue JSHTMLCanvasElement::toDataURL(ExecState* exec)
             qualityPtr = &quality;
         }
     }
-    
+
     JSValue result = jsString(exec, canvas->toDataURL(type, qualityPtr, ec));
     setDOMException(exec, ec);
     return result;
diff --git a/Source/WebCore/bindings/js/JSIDBAnyCustom.cpp b/Source/WebCore/bindings/js/JSIDBAnyCustom.cpp
index defa656e7..cf545d300 100644
--- a/Source/WebCore/bindings/js/JSIDBAnyCustom.cpp
+++ b/Source/WebCore/bindings/js/JSIDBAnyCustom.cpp
@@ -41,6 +41,7 @@
 #include "IDBObjectStore.h"
 #include "JSDOMStringList.h"
 #include "JSIDBCursor.h"
+#include "JSIDBCursorWithValue.h"
 #include "JSIDBDatabase.h"
 #include "JSIDBFactory.h"
 #include "JSIDBIndex.h"
@@ -68,7 +69,7 @@ JSValue toJS(ExecState* exec, JSDOMGlobalObject* globalObject, IDBAny* idbAny)
     case IDBAny::IDBCursorType:
         return toJS(exec, globalObject, idbAny->idbCursor());
     case IDBAny::IDBCursorWithValueType:
-        return toJS(exec, globalObject, idbAny->idbCursorWithValue());
+        return wrap<JSIDBCursorWithValue>(exec, globalObject, idbAny->idbCursorWithValue().get());
     case IDBAny::IDBDatabaseType:
         return toJS(exec, globalObject, idbAny->idbDatabase());
     case IDBAny::IDBFactoryType:
diff --git a/Source/WebCore/bindings/js/JSInjectedScriptManager.cpp b/Source/WebCore/bindings/js/JSInjectedScriptManager.cpp
index 1576d346d..138193bba 100644
--- a/Source/WebCore/bindings/js/JSInjectedScriptManager.cpp
+++ b/Source/WebCore/bindings/js/JSInjectedScriptManager.cpp
@@ -1,7 +1,7 @@
 /*
  * Copyright (C) 2007, 2008 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Matt Lilek <webkit@mattlilek.com>
- * Copyright (C) 2010-2011 Google Inc. All rights reserved.
+ * Copyright (C) 2012 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
@@ -37,11 +37,11 @@
 #include "InjectedScriptManager.h"
 
 #include "ExceptionCode.h"
-#include "InjectedScript.h"
 #include "JSDOMWindow.h"
 #include "JSDOMWindowCustom.h"
 #include "JSInjectedScriptHost.h"
 #include "JSMainThreadExecState.h"
+#include "ScriptObject.h"
 #include <parser/SourceCode.h>
 #include <runtime/JSLock.h>
 
@@ -72,36 +72,13 @@ ScriptObject InjectedScriptManager::createInjectedScript(const String& source, S
     args.append(toJS(scriptState, globalObject, m_injectedScriptHost.get()));
     args.append(globalThisValue);
     args.append(jsNumber(id));
+
     JSValue result = JSC::call(scriptState, functionValue, callType, callData, globalThisValue, args);
     if (result.isObject())
         return ScriptObject(scriptState, result.getObject());
     return ScriptObject();
 }
 
-void InjectedScriptManager::discardInjectedScript(ScriptState* scriptState)
-{
-    JSDOMGlobalObject* globalObject = jsCast<JSDOMGlobalObject*>(scriptState->lexicalGlobalObject());
-    globalObject->setInjectedScript(0);
-}
-
-InjectedScript InjectedScriptManager::injectedScriptFor(ScriptState* scriptState)
-{
-    JSLock lock(SilenceAssertionsOnly);
-    JSDOMGlobalObject* globalObject = jsCast<JSDOMGlobalObject*>(scriptState->lexicalGlobalObject());
-    JSObject* injectedScript = globalObject->injectedScript();
-    if (injectedScript)
-        return InjectedScript(ScriptObject(scriptState, injectedScript), m_inspectedStateAccessCheck);
-
-    if (!m_inspectedStateAccessCheck(scriptState))
-        return InjectedScript();
-
-    pair<int, ScriptObject> injectedScriptObject = injectScript(injectedScriptSource(), scriptState);
-    globalObject->setInjectedScript(injectedScriptObject.second.jsObject());
-    InjectedScript result(injectedScriptObject.second, m_inspectedStateAccessCheck);
-    m_idToInjectedScript.set(injectedScriptObject.first, result);
-    return result;
-}
-
 bool InjectedScriptManager::canAccessInspectedWindow(ScriptState* scriptState)
 {
     JSLock lock(SilenceAssertionsOnly);
diff --git a/Source/WebCore/bindings/js/JSInspectorFrontendHostCustom.cpp b/Source/WebCore/bindings/js/JSInspectorFrontendHostCustom.cpp
index 3c7199461..7c4945053 100644
--- a/Source/WebCore/bindings/js/JSInspectorFrontendHostCustom.cpp
+++ b/Source/WebCore/bindings/js/JSInspectorFrontendHostCustom.cpp
@@ -144,6 +144,8 @@ JSValue JSInspectorFrontendHost::showContextMenu(ExecState* exec)
     Vector<ContextMenuItem> items = menu.items();
 #endif
     impl()->showContextMenu(event, items);
+#else
+    UNUSED_PARAM(exec);
 #endif
     return jsUndefined();
 }
diff --git a/Source/WebCore/bindings/js/JSJavaScriptCallFrameCustom.cpp b/Source/WebCore/bindings/js/JSJavaScriptCallFrameCustom.cpp
index a32546701..40d3a3fb8 100644
--- a/Source/WebCore/bindings/js/JSJavaScriptCallFrameCustom.cpp
+++ b/Source/WebCore/bindings/js/JSJavaScriptCallFrameCustom.cpp
@@ -48,6 +48,12 @@ JSValue JSJavaScriptCallFrame::evaluate(ExecState* exec)
     return result;
 }
 
+JSValue JSJavaScriptCallFrame::restart(ExecState*)
+{
+    // FIXME(40300): implement this.
+    return JSValue(JSValue::JSFalse);
+}
+
 JSValue JSJavaScriptCallFrame::thisObject(ExecState*) const
 {
     return impl()->thisObject() ? JSValue(impl()->thisObject()) : jsNull();
diff --git a/Source/WebCore/bindings/js/JSMainThreadExecState.cpp b/Source/WebCore/bindings/js/JSMainThreadExecState.cpp
index 9177a4b10..00bc170d2 100644
--- a/Source/WebCore/bindings/js/JSMainThreadExecState.cpp
+++ b/Source/WebCore/bindings/js/JSMainThreadExecState.cpp
@@ -27,15 +27,23 @@
 #include "JSMainThreadExecState.h"
 #include "WebKitMutationObserver.h"
 
+#if ENABLE(INDEXED_DATABASE)
+#include "IDBPendingTransactionMonitor.h"
+#endif
+
 namespace WebCore {
 
 JSC::ExecState* JSMainThreadExecState::s_mainThreadState = 0;
 
-#if ENABLE(MUTATION_OBSERVERS)
 void JSMainThreadExecState::didLeaveScriptContext()
 {
+#if ENABLE(INDEXED_DATABASE)
+    IDBPendingTransactionMonitor::abortPendingTransactions();   
+#endif
+
+#if ENABLE(MUTATION_OBSERVERS)
     WebKitMutationObserver::deliverAllMutations();
-}
 #endif
+}
 
 } // namespace WebCore
diff --git a/Source/WebCore/bindings/js/JSMainThreadExecState.h b/Source/WebCore/bindings/js/JSMainThreadExecState.h
index 14886f5e1..b9af0669a 100644
--- a/Source/WebCore/bindings/js/JSMainThreadExecState.h
+++ b/Source/WebCore/bindings/js/JSMainThreadExecState.h
@@ -88,25 +88,19 @@ protected:
     {
         ASSERT(isMainThread());
 
-#if ENABLE(MUTATION_OBSERVERS)
         bool didExitJavaScript = s_mainThreadState && !m_previousState;
-#endif
 
         s_mainThreadState = m_previousState;
 
-#if ENABLE(MUTATION_OBSERVERS)
         if (didExitJavaScript)
             didLeaveScriptContext();
-#endif
     }
 
 private:
     static JSC::ExecState* s_mainThreadState;
     JSC::ExecState* m_previousState;
 
-#if ENABLE(MUTATION_OBSERVERS)
     static void didLeaveScriptContext();
-#endif
 };
 
 // Null state prevents origin security checks.
diff --git a/Source/WebCore/bindings/js/JSWebGLRenderingContextCustom.cpp b/Source/WebCore/bindings/js/JSWebGLRenderingContextCustom.cpp
index d6cf4ad2f..d6a171fb9 100644
--- a/Source/WebCore/bindings/js/JSWebGLRenderingContextCustom.cpp
+++ b/Source/WebCore/bindings/js/JSWebGLRenderingContextCustom.cpp
@@ -46,6 +46,7 @@
 #include "JSUint8Array.h"
 #include "JSWebGLBuffer.h"
 #include "JSWebGLCompressedTextureS3TC.h"
+#include "JSWebGLDepthTexture.h"
 #include "JSWebGLFramebuffer.h"
 #include "JSWebGLLoseContext.h"
 #include "JSWebGLProgram.h"
@@ -63,6 +64,7 @@
 #include "WebGLCompressedTextureS3TC.h"
 #include "WebGLDebugRendererInfo.h"
 #include "WebGLDebugShaders.h"
+#include "WebGLDepthTexture.h"
 #include "WebGLExtension.h"
 #include "WebGLFramebuffer.h"
 #include "WebGLGetInfo.h"
@@ -204,6 +206,8 @@ static JSValue toJS(ExecState* exec, JSDOMGlobalObject* globalObject, WebGLExten
         return toJS(exec, globalObject, static_cast<WebGLDebugShaders*>(extension));
     case WebGLExtension::WebKitWebGLCompressedTextureS3TCName:
         return toJS(exec, globalObject, static_cast<WebGLCompressedTextureS3TC*>(extension));
+    case WebGLExtension::WebKitWebGLDepthTextureName:
+        return toJS(exec, globalObject, static_cast<WebGLDepthTexture*>(extension));
     }
     ASSERT_NOT_REACHED();
     return jsNull();
diff --git a/Source/WebCore/bindings/js/JSXMLHttpRequestCustom.cpp b/Source/WebCore/bindings/js/JSXMLHttpRequestCustom.cpp
index 82bdec417..13b4c008a 100644
--- a/Source/WebCore/bindings/js/JSXMLHttpRequestCustom.cpp
+++ b/Source/WebCore/bindings/js/JSXMLHttpRequestCustom.cpp
@@ -71,10 +71,8 @@ void JSXMLHttpRequest::visitChildren(JSCell* cell, SlotVisitor& visitor)
     if (ArrayBuffer* responseArrayBuffer = thisObject->m_impl->optionalResponseArrayBuffer())
         visitor.addOpaqueRoot(responseArrayBuffer);
 
-#if ENABLE(XHR_RESPONSE_BLOB)
     if (Blob* responseBlob = thisObject->m_impl->optionalResponseBlob())
         visitor.addOpaqueRoot(responseBlob);
-#endif
 
     thisObject->m_impl->visitJSEventListeners(visitor);
 }
@@ -174,7 +172,6 @@ JSValue JSXMLHttpRequest::response(ExecState* exec) const
         }
 
     case XMLHttpRequest::ResponseTypeBlob:
-#if ENABLE(XHR_RESPONSE_BLOB)
         {
             ExceptionCode ec = 0;
             Blob* blob = impl()->responseBlob(ec);
@@ -184,9 +181,6 @@ JSValue JSXMLHttpRequest::response(ExecState* exec) const
             }
             return toJS(exec, globalObject(), blob);
         }
-#else
-        return jsUndefined();
-#endif
 
     case XMLHttpRequest::ResponseTypeArrayBuffer:
         {
diff --git a/Source/WebCore/bindings/js/ScriptController.cpp b/Source/WebCore/bindings/js/ScriptController.cpp
index fd80a467f..7999502bd 100644
--- a/Source/WebCore/bindings/js/ScriptController.cpp
+++ b/Source/WebCore/bindings/js/ScriptController.cpp
@@ -233,6 +233,14 @@ TextPosition ScriptController::eventHandlerPosition() const
     return TextPosition::minimumPosition();
 }
 
+void ScriptController::enableEval()
+{
+    JSDOMWindowShell* windowShell = existingWindowShell(mainThreadNormalWorld());
+    if (!windowShell)
+        return; // Eval is enabled by default.
+    windowShell->window()->setEvalEnabled(true);
+}
+
 void ScriptController::disableEval()
 {
     windowShell(mainThreadNormalWorld())->window()->setEvalEnabled(false);
diff --git a/Source/WebCore/bindings/js/ScriptController.h b/Source/WebCore/bindings/js/ScriptController.h
index 9e8c28d6a..0ed986969 100644
--- a/Source/WebCore/bindings/js/ScriptController.h
+++ b/Source/WebCore/bindings/js/ScriptController.h
@@ -104,6 +104,7 @@ public:
 
     WTF::TextPosition eventHandlerPosition() const;
 
+    void enableEval();
     void disableEval();
 
     static bool processingUserGesture();
diff --git a/Source/WebCore/bindings/js/ScriptDebugServer.cpp b/Source/WebCore/bindings/js/ScriptDebugServer.cpp
index 4dec15ed8..2d91d8a5e 100644
--- a/Source/WebCore/bindings/js/ScriptDebugServer.cpp
+++ b/Source/WebCore/bindings/js/ScriptDebugServer.cpp
@@ -152,7 +152,11 @@ void ScriptDebugServer::setPauseOnNextStatement(bool pause)
 
 void ScriptDebugServer::breakProgram()
 {
-    // FIXME(WK43332): implement this.
+    if (m_paused || !m_currentCallFrame)
+        return;
+
+    m_pauseOnNextStatement = true;
+    pauseIfNeeded(m_currentCallFrame->dynamicGlobalObject());
 }
 
 void ScriptDebugServer::continueProgram()
@@ -202,6 +206,13 @@ bool ScriptDebugServer::setScriptSource(const String&, const String&, bool, Stri
     return false;
 }
 
+
+void ScriptDebugServer::updateCallStack(ScriptValue*)
+{
+    // This method is used for restart frame feature that is not implemented yet.
+    // FIXME(40300): implement this.
+}
+
 void ScriptDebugServer::dispatchDidPause(ScriptDebugListener* listener)
 {
     ASSERT(m_paused);
diff --git a/Source/WebCore/bindings/js/ScriptDebugServer.h b/Source/WebCore/bindings/js/ScriptDebugServer.h
index fd0a8bc34..fad261174 100644
--- a/Source/WebCore/bindings/js/ScriptDebugServer.h
+++ b/Source/WebCore/bindings/js/ScriptDebugServer.h
@@ -83,9 +83,9 @@ public:
 
     bool canSetScriptSource();
     bool setScriptSource(const String& sourceID, const String& newContent, bool preview, String* error, ScriptValue* newCallFrames, ScriptObject* result);
+    void updateCallStack(ScriptValue* callFrame);
 
     bool causesRecompilation() { return true; }
-    bool supportsNativeBreakpoints() { return false; }
 
     void recompileAllJSFunctionsSoon();
     virtual void recompileAllJSFunctions(Timer<ScriptDebugServer>* = 0) = 0;
diff --git a/Source/WebCore/bindings/js/ScriptFunctionCall.cpp b/Source/WebCore/bindings/js/ScriptFunctionCall.cpp
index 5c9ebc096..83b0e45b1 100644
--- a/Source/WebCore/bindings/js/ScriptFunctionCall.cpp
+++ b/Source/WebCore/bindings/js/ScriptFunctionCall.cpp
@@ -191,7 +191,7 @@ ScriptObject ScriptFunctionCall::construct(bool& hadException, bool reportExcept
     return ScriptObject(m_exec, asObject(result));
 }
 
-ScriptCallback::ScriptCallback(ScriptState* state, ScriptValue function)
+ScriptCallback::ScriptCallback(ScriptState* state, const ScriptValue& function)
     : ScriptCallArgumentHandler(state)
     , m_function(function)
 {
diff --git a/Source/WebCore/bindings/js/ScriptFunctionCall.h b/Source/WebCore/bindings/js/ScriptFunctionCall.h
index c7da85835..69b5e28db 100644
--- a/Source/WebCore/bindings/js/ScriptFunctionCall.h
+++ b/Source/WebCore/bindings/js/ScriptFunctionCall.h
@@ -87,7 +87,7 @@ namespace WebCore {
 
     class ScriptCallback : public ScriptCallArgumentHandler {
     public:
-        ScriptCallback(ScriptState*, ScriptValue);
+        ScriptCallback(ScriptState*, const ScriptValue&);
 
         ScriptValue call();
         ScriptValue call(bool& hadException);
diff --git a/Source/WebCore/bindings/js/ScriptProfiler.cpp b/Source/WebCore/bindings/js/ScriptProfiler.cpp
index c4c4d74d1..d6afd8966 100644
--- a/Source/WebCore/bindings/js/ScriptProfiler.cpp
+++ b/Source/WebCore/bindings/js/ScriptProfiler.cpp
@@ -51,7 +51,7 @@ ScriptObject ScriptProfiler::objectByHeapObjectId(unsigned)
     return ScriptObject();
 }
 
-unsigned ScriptProfiler::getHeapObjectId(ScriptValue)
+unsigned ScriptProfiler::getHeapObjectId(const ScriptValue&)
 {
     return 0;
 }
diff --git a/Source/WebCore/bindings/js/ScriptProfiler.h b/Source/WebCore/bindings/js/ScriptProfiler.h
index ce4468e77..04a615ddb 100644
--- a/Source/WebCore/bindings/js/ScriptProfiler.h
+++ b/Source/WebCore/bindings/js/ScriptProfiler.h
@@ -56,7 +56,7 @@ public:
 
     static void collectGarbage();
     static ScriptObject objectByHeapObjectId(unsigned id);
-    static unsigned getHeapObjectId(ScriptValue);
+    static unsigned getHeapObjectId(const ScriptValue&);
     static void start(ScriptState* state, const String& title);
     static void startForPage(Page*, const String& title);
 #if ENABLE(WORKERS)
@@ -74,6 +74,7 @@ public:
     // FIXME: Implement this counter for JSC. See bug 73936 for more details.
     static void visitJSDOMWrappers(DOMWrapperVisitor*) { }
     static void visitExternalJSStrings(DOMWrapperVisitor*) { }
+    static size_t profilerSnapshotsSize() { return 0; }
 };
 
 } // namespace WebCore
diff --git a/Source/WebCore/bindings/js/SerializedScriptValue.cpp b/Source/WebCore/bindings/js/SerializedScriptValue.cpp
index c25f76834..2b47d4b62 100644
--- a/Source/WebCore/bindings/js/SerializedScriptValue.cpp
+++ b/Source/WebCore/bindings/js/SerializedScriptValue.cpp
@@ -351,6 +351,18 @@ public:
         writeLittleEndian<uint8_t>(out, value ? TrueTag : FalseTag);
     }
 
+    static void serializeNumber(double value, Vector<uint8_t>& out)
+    {
+        writeLittleEndian(out, CurrentVersion);
+        writeLittleEndian<uint8_t>(out, DoubleTag);
+        union {
+            double d;
+            int64_t i;
+        } u;
+        u.d = value;
+        writeLittleEndian(out, u.i);
+    }
+
 private:
     typedef HashMap<JSObject*, uint32_t> ObjectPool;
 
@@ -976,6 +988,18 @@ typedef Vector<WTF::ArrayBufferContents> ArrayBufferContentsArray;
 
 class CloneDeserializer : CloneBase {
 public:
+    static String toWireString(const Vector<unsigned char>& value)
+    {
+        const uint8_t* start = value.begin();
+        const uint8_t* end = value.end();
+        const uint32_t length = value.size() / sizeof(UChar);
+        UString str;
+        if (!CloneDeserializer::readString(start, end, str, length))
+            return String();
+
+        return String(str.impl());
+    }
+
     static String deserializeString(const Vector<uint8_t>& buffer)
     {
         const uint8_t* ptr = buffer.begin();
@@ -1763,33 +1787,34 @@ PassRefPtr<SerializedScriptValue> SerializedScriptValue::create(const String& st
 }
 
 #if ENABLE(INDEXED_DATABASE)
-PassRefPtr<SerializedScriptValue> SerializedScriptValue::create(JSC::ExecState*, JSC::JSValue)
+PassRefPtr<SerializedScriptValue> SerializedScriptValue::create(JSC::ExecState* exec, JSC::JSValue value)
 {
-    notImplemented();
-    return PassRefPtr<SerializedScriptValue>();
+    return SerializedScriptValue::create(exec, value, 0, 0);
 }
 
 String SerializedScriptValue::toWireString() const
 {
-    notImplemented();
-    return String();
+    return CloneDeserializer::toWireString(m_data);
 }
-PassRefPtr<SerializedScriptValue> SerializedScriptValue::createFromWire(const String&)
+
+PassRefPtr<SerializedScriptValue> SerializedScriptValue::createFromWire(const String& value)
 {
-    notImplemented();
-    return PassRefPtr<SerializedScriptValue>();
+    Vector<uint8_t> buffer;
+    if (!writeLittleEndian(buffer, value.impl()->characters(), value.length()))
+        return 0;
+    return adoptRef(new SerializedScriptValue(buffer));
 }
 
-PassRefPtr<SerializedScriptValue> SerializedScriptValue::numberValue(double)
+PassRefPtr<SerializedScriptValue> SerializedScriptValue::numberValue(double value)
 {
-    notImplemented();
-    return PassRefPtr<SerializedScriptValue>();
+    Vector<uint8_t> buffer;
+    CloneSerializer::serializeNumber(value, buffer);
+    return adoptRef(new SerializedScriptValue(buffer));
 }
 
-JSValue SerializedScriptValue::deserialize(JSC::ExecState*, JSC::JSGlobalObject*)
+JSValue SerializedScriptValue::deserialize(JSC::ExecState* exec, JSC::JSGlobalObject* globalObject)
 {
-    notImplemented();
-    return JSValue();
+    return deserialize(exec, globalObject, 0);
 }
 #endif
 
diff --git a/Source/WebCore/bindings/js/WorkerScriptController.cpp b/Source/WebCore/bindings/js/WorkerScriptController.cpp
index b11544981..e2e607d95 100644
--- a/Source/WebCore/bindings/js/WorkerScriptController.cpp
+++ b/Source/WebCore/bindings/js/WorkerScriptController.cpp
@@ -155,7 +155,7 @@ void WorkerScriptController::evaluate(const ScriptSourceCode& sourceCode, Script
     }
 }
 
-void WorkerScriptController::setException(ScriptValue exception)
+void WorkerScriptController::setException(const ScriptValue& exception)
 {
     throwError(m_workerContextWrapper->globalExec(), exception.jsValue());
 }
diff --git a/Source/WebCore/bindings/js/WorkerScriptController.h b/Source/WebCore/bindings/js/WorkerScriptController.h
index 59727f6dc..3b2acd4b6 100644
--- a/Source/WebCore/bindings/js/WorkerScriptController.h
+++ b/Source/WebCore/bindings/js/WorkerScriptController.h
@@ -60,7 +60,7 @@ namespace WebCore {
         void evaluate(const ScriptSourceCode&);
         void evaluate(const ScriptSourceCode&, ScriptValue* exception);
 
-        void setException(ScriptValue);
+        void setException(const ScriptValue&);
 
         // Async request to terminate a JS run execution. Eventually causes termination
         // exception raised during JS execution, if the worker thread happens to run JS.