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diff --git a/Source/JavaScriptCore/runtime/JSBoundSlotBaseFunction.cpp b/Source/JavaScriptCore/runtime/JSBoundSlotBaseFunction.cpp
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+++ b/Source/JavaScriptCore/runtime/JSBoundSlotBaseFunction.cpp
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+/*
+ * Copyright (C) 2015, 2016 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. 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.
+ */
+
+#include "config.h"
+#include "JSBoundSlotBaseFunction.h"
+
+#include "CustomGetterSetter.h"
+#include "GetterSetter.h"
+#include "JSCInlines.h"
+#include "JSGlobalObject.h"
+
+namespace JSC {
+
+const ClassInfo JSBoundSlotBaseFunction::s_info = { "Function", &Base::s_info, 0, CREATE_METHOD_TABLE(JSBoundSlotBaseFunction) };
+
+EncodedJSValue JSC_HOST_CALL boundSlotBaseFunctionCall(ExecState* exec)
+{
+    JSBoundSlotBaseFunction* boundSlotBaseFunction = jsCast<JSBoundSlotBaseFunction*>(exec->callee());
+    JSObject* baseObject = boundSlotBaseFunction->boundSlotBase();
+    CustomGetterSetter* customGetterSetter = boundSlotBaseFunction->customGetterSetter();
+
+    if (boundSlotBaseFunction->isSetter()) {
+        callCustomSetter(exec, customGetterSetter, true, baseObject, exec->thisValue(), exec->argument(0));
+        return JSValue::encode(jsUndefined());
+    }
+
+    CustomGetterSetter::CustomGetter getter = customGetterSetter->getter();
+    if (!getter)
+        return JSValue::encode(jsUndefined());
+
+    const String& name = boundSlotBaseFunction->name(exec);
+    return getter(exec, JSValue::encode(exec->thisValue()), PropertyName(Identifier::fromString(exec, name)));
+}
+
+JSBoundSlotBaseFunction::JSBoundSlotBaseFunction(VM& vm, JSGlobalObject* globalObject, Structure* structure, const Type type)
+    : Base(vm, globalObject, structure)
+    , m_type(type)
+{
+}
+
+JSBoundSlotBaseFunction* JSBoundSlotBaseFunction::create(VM& vm, JSGlobalObject* globalObject, JSObject* boundSlotBase, CustomGetterSetter* getterSetter, const Type type, const String& name)
+{
+    NativeExecutable* executable = vm.getHostFunction(boundSlotBaseFunctionCall, callHostFunctionAsConstructor, name);
+
+    JSBoundSlotBaseFunction* function = new (NotNull, allocateCell<JSBoundSlotBaseFunction>(vm.heap)) JSBoundSlotBaseFunction(vm, globalObject, globalObject->boundSlotBaseFunctionStructure(), type);
+
+    // Can't do this during initialization because getHostFunction might do a GC allocation.
+    function->finishCreation(vm, executable, boundSlotBase, getterSetter, name);
+    return function;
+}
+
+void JSBoundSlotBaseFunction::visitChildren(JSCell* cell, SlotVisitor& visitor)
+{
+    JSBoundSlotBaseFunction* thisObject = jsCast<JSBoundSlotBaseFunction*>(cell);
+    ASSERT_GC_OBJECT_INHERITS(thisObject, info());
+    Base::visitChildren(thisObject, visitor);
+
+    visitor.append(&thisObject->m_boundSlotBase);
+    visitor.append(&thisObject->m_getterSetter);
+}
+
+void JSBoundSlotBaseFunction::finishCreation(VM& vm, NativeExecutable* executable, JSObject* boundSlotBase, CustomGetterSetter* getterSetter, const String& name)
+{
+    Base::finishCreation(vm, executable, isSetter(), name);
+    ASSERT(inherits(info()));
+    ASSERT(boundSlotBase);
+    ASSERT(getterSetter);
+    m_boundSlotBase.set(vm, this, boundSlotBase);
+    m_getterSetter.set(vm, this, getterSetter);
+}
+
+} // namespace JSC