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diff --git a/JavaScriptCore/runtime/JSActivation.cpp b/JavaScriptCore/runtime/JSActivation.cpp
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+++ b/JavaScriptCore/runtime/JSActivation.cpp
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+/*
+ * 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.
+ * 3.  Neither the name of Apple Computer, Inc. ("Apple") 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 APPLE 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 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 "JSActivation.h"
+
+#include "Arguments.h"
+#include "Machine.h"
+#include "JSFunction.h"
+
+namespace JSC {
+
+ASSERT_CLASS_FITS_IN_CELL(JSActivation);
+
+const ClassInfo JSActivation::info = { "JSActivation", 0, 0, 0 };
+
+JSActivation::JSActivation(CallFrame* callFrame, PassRefPtr<FunctionBodyNode> functionBody)
+    : Base(callFrame->globalData().activationStructureID, new JSActivationData(functionBody, callFrame))
+{
+}
+
+JSActivation::~JSActivation()
+{
+    delete d();
+}
+
+void JSActivation::mark()
+{
+    Base::mark();
+
+    Register* registerArray = d()->registerArray.get();
+    if (!registerArray)
+        return;
+
+    size_t numParametersMinusThis = d()->functionBody->generatedByteCode().numParameters - 1;
+
+    size_t i = 0;
+    size_t count = numParametersMinusThis; 
+    for ( ; i < count; ++i) {
+        Register& r = registerArray[i];
+        if (!r.marked())
+            r.mark();
+    }
+
+    size_t numVars = d()->functionBody->generatedByteCode().numVars;
+
+    // Skip the call frame, which sits between the parameters and vars.
+    i += RegisterFile::CallFrameHeaderSize;
+    count += RegisterFile::CallFrameHeaderSize + numVars;
+
+    for ( ; i < count; ++i) {
+        Register& r = registerArray[i];
+        if (!r.marked())
+            r.mark();
+    }
+}
+
+bool JSActivation::getOwnPropertySlot(ExecState* exec, const Identifier& propertyName, PropertySlot& slot)
+{
+    if (symbolTableGet(propertyName, slot))
+        return true;
+
+    if (JSValue** location = getDirectLocation(propertyName)) {
+        slot.setValueSlot(location);
+        return true;
+    }
+
+    // Only return the built-in arguments object if it wasn't overridden above.
+    if (propertyName == exec->propertyNames().arguments) {
+        slot.setCustom(this, getArgumentsGetter());
+        return true;
+    }
+
+    // We don't call through to JSObject because there's no way to give an 
+    // activation object getter properties or a prototype.
+    ASSERT(!hasGetterSetterProperties());
+    ASSERT(prototype()->isNull());
+    return false;
+}
+
+void JSActivation::put(ExecState*, const Identifier& propertyName, JSValue* value, PutPropertySlot& slot)
+{
+    ASSERT(!Heap::heap(value) || Heap::heap(value) == Heap::heap(this));
+
+    if (symbolTablePut(propertyName, value))
+        return;
+
+    // We don't call through to JSObject because __proto__ and getter/setter 
+    // properties are non-standard extensions that other implementations do not
+    // expose in the activation object.
+    ASSERT(!hasGetterSetterProperties());
+    putDirect(propertyName, value, 0, true, slot);
+}
+
+// FIXME: Make this function honor ReadOnly (const) and DontEnum
+void JSActivation::putWithAttributes(ExecState*, const Identifier& propertyName, JSValue* value, unsigned attributes)
+{
+    ASSERT(!Heap::heap(value) || Heap::heap(value) == Heap::heap(this));
+
+    if (symbolTablePutWithAttributes(propertyName, value, attributes))
+        return;
+
+    // We don't call through to JSObject because __proto__ and getter/setter 
+    // properties are non-standard extensions that other implementations do not
+    // expose in the activation object.
+    ASSERT(!hasGetterSetterProperties());
+    PutPropertySlot slot;
+    putDirect(propertyName, value, attributes, true, slot);
+}
+
+bool JSActivation::deleteProperty(ExecState* exec, const Identifier& propertyName)
+{
+    if (propertyName == exec->propertyNames().arguments)
+        return false;
+
+    return Base::deleteProperty(exec, propertyName);
+}
+
+JSObject* JSActivation::toThisObject(ExecState* exec) const
+{
+    return exec->globalThisValue();
+}
+
+bool JSActivation::isDynamicScope() const
+{
+    return d()->functionBody->usesEval();
+}
+
+JSValue* JSActivation::argumentsGetter(ExecState* exec, const Identifier&, const PropertySlot& slot)
+{
+    JSActivation* activation = asActivation(slot.slotBase());
+
+    if (activation->d()->functionBody->usesArguments()) {
+        PropertySlot slot;
+        activation->symbolTableGet(exec->propertyNames().arguments, slot);
+        return slot.getValue(exec, exec->propertyNames().arguments);
+    }
+
+    CallFrame* callFrame = CallFrame::create(activation->d()->registers);
+    Arguments* arguments = callFrame->optionalCalleeArguments();
+    if (!arguments) {
+        arguments = new (callFrame) Arguments(callFrame);
+        arguments->copyRegisters();
+        callFrame->setCalleeArguments(arguments);
+    }
+    ASSERT(arguments->isObject(&Arguments::info));
+
+    return arguments;
+}
+
+// These two functions serve the purpose of isolating the common case from a
+// PIC branch.
+
+PropertySlot::GetValueFunc JSActivation::getArgumentsGetter()
+{
+    return argumentsGetter;
+}
+
+} // namespace JSC