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diff --git a/Source/JavaScriptCore/runtime/JSActivation.h b/Source/JavaScriptCore/runtime/JSActivation.h
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+++ b/Source/JavaScriptCore/runtime/JSActivation.h
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+/*
+ * Copyright (C) 2008, 2009, 2013 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.
+ */
+ 
+#ifndef JSActivation_h
+#define JSActivation_h
+
+#include "CodeBlock.h"
+#include "CopiedSpaceInlines.h"
+#include "JSVariableObject.h"
+#include "Nodes.h"
+#include "SymbolTable.h"
+
+namespace JSC {
+
+class Register;
+    
+class JSActivation : public JSVariableObject {
+private:
+    JSActivation(VM&, CallFrame*, Register*, SymbolTable*);
+    
+public:
+    typedef JSVariableObject Base;
+
+    static JSActivation* create(VM& vm, CallFrame* callFrame, Register* registers, CodeBlock* codeBlock)
+    {
+        SymbolTable* symbolTable = codeBlock->symbolTable();
+        ASSERT(codeBlock->codeType() == FunctionCode);
+        JSActivation* activation = new (
+            NotNull,
+            allocateCell<JSActivation>(
+                vm.heap,
+                allocationSize(symbolTable)
+            )
+        ) JSActivation(vm, callFrame, registers, symbolTable);
+        activation->finishCreation(vm);
+        return activation;
+    }
+        
+    static JSActivation* create(VM& vm, CallFrame* callFrame, CodeBlock* codeBlock)
+    {
+        return create(vm, callFrame, callFrame->registers(), codeBlock);
+    }
+
+    static void visitChildren(JSCell*, SlotVisitor&);
+
+    static bool getOwnPropertySlot(JSObject*, ExecState*, PropertyName, PropertySlot&);
+    static void getOwnNonIndexPropertyNames(JSObject*, ExecState*, PropertyNameArray&, EnumerationMode);
+
+    static void put(JSCell*, ExecState*, PropertyName, JSValue, PutPropertySlot&);
+
+    static bool deleteProperty(JSCell*, ExecState*, PropertyName);
+
+    static JSValue toThis(JSCell*, ExecState*, ECMAMode);
+
+    void tearOff(VM&);
+        
+    DECLARE_INFO;
+
+    static Structure* createStructure(VM& vm, JSGlobalObject* globalObject, JSValue proto) { return Structure::create(vm, globalObject, proto, TypeInfo(ActivationObjectType, StructureFlags), info()); }
+
+    WriteBarrierBase<Unknown>& registerAt(int) const;
+    bool isValidIndex(int) const;
+    bool isValid(const SymbolTableEntry&) const;
+    bool isTornOff();
+    int registersOffset();
+    static int registersOffset(SymbolTable*);
+
+protected:
+    static const unsigned StructureFlags = OverridesGetOwnPropertySlot | OverridesVisitChildren | OverridesGetPropertyNames | Base::StructureFlags;
+
+private:
+    bool symbolTableGet(PropertyName, PropertySlot&);
+    bool symbolTableGet(PropertyName, PropertyDescriptor&);
+    bool symbolTableGet(PropertyName, PropertySlot&, bool& slotIsWriteable);
+    bool symbolTablePut(ExecState*, PropertyName, JSValue, bool shouldThrow);
+    bool symbolTablePutWithAttributes(VM&, PropertyName, JSValue, unsigned attributes);
+
+    static EncodedJSValue argumentsGetter(ExecState*, EncodedJSValue, EncodedJSValue, PropertyName);
+
+    static size_t allocationSize(SymbolTable*);
+    static size_t storageOffset();
+
+    WriteBarrier<Unknown>* storage(); // captureCount() number of registers.
+};
+
+extern int activationCount;
+extern int allTheThingsCount;
+
+inline JSActivation::JSActivation(VM& vm, CallFrame* callFrame, Register* registers, SymbolTable* symbolTable)
+    : Base(
+        vm,
+        callFrame->lexicalGlobalObject()->activationStructure(),
+        registers,
+        callFrame->scope(),
+        symbolTable)
+{
+    WriteBarrier<Unknown>* storage = this->storage();
+    size_t captureCount = symbolTable->captureCount();
+    for (size_t i = 0; i < captureCount; ++i)
+        new (NotNull, &storage[i]) WriteBarrier<Unknown>;
+}
+
+JSActivation* asActivation(JSValue);
+
+inline JSActivation* asActivation(JSValue value)
+{
+    ASSERT(asObject(value)->inherits(JSActivation::info()));
+    return jsCast<JSActivation*>(asObject(value));
+}
+    
+ALWAYS_INLINE JSActivation* Register::activation() const
+{
+    return asActivation(jsValue());
+}
+
+inline int JSActivation::registersOffset(SymbolTable* symbolTable)
+{
+    return storageOffset() + ((symbolTable->captureCount() - symbolTable->captureStart()  - 1) * sizeof(WriteBarrier<Unknown>));
+}
+
+inline void JSActivation::tearOff(VM& vm)
+{
+    ASSERT(!isTornOff());
+
+    WriteBarrierBase<Unknown>* dst = reinterpret_cast_ptr<WriteBarrierBase<Unknown>*>(
+        reinterpret_cast<char*>(this) + registersOffset(symbolTable()));
+    WriteBarrierBase<Unknown>* src = m_registers;
+
+    int captureEnd = symbolTable()->captureEnd();
+    for (int i = symbolTable()->captureStart(); i > captureEnd; --i)
+        dst[i].set(vm, this, src[i].get());
+
+    m_registers = dst;
+    ASSERT(isTornOff());
+}
+
+inline bool JSActivation::isTornOff()
+{
+    return m_registers == reinterpret_cast_ptr<WriteBarrierBase<Unknown>*>(
+        reinterpret_cast<char*>(this) + registersOffset(symbolTable()));
+}
+
+inline size_t JSActivation::storageOffset()
+{
+    return WTF::roundUpToMultipleOf<sizeof(WriteBarrier<Unknown>)>(sizeof(JSActivation));
+}
+
+inline WriteBarrier<Unknown>* JSActivation::storage()
+{
+    return reinterpret_cast_ptr<WriteBarrier<Unknown>*>(
+        reinterpret_cast<char*>(this) + storageOffset());
+}
+
+inline size_t JSActivation::allocationSize(SymbolTable* symbolTable)
+{
+    size_t objectSizeInBytes = WTF::roundUpToMultipleOf<sizeof(WriteBarrier<Unknown>)>(sizeof(JSActivation));
+    size_t storageSizeInBytes = symbolTable->captureCount() * sizeof(WriteBarrier<Unknown>);
+    return objectSizeInBytes + storageSizeInBytes;
+}
+
+inline bool JSActivation::isValidIndex(int index) const
+{
+    if (index > symbolTable()->captureStart())
+        return false;
+    if (index <= symbolTable()->captureEnd())
+        return false;
+    return true;
+}
+
+inline bool JSActivation::isValid(const SymbolTableEntry& entry) const
+{
+    return isValidIndex(entry.getIndex());
+}
+
+inline WriteBarrierBase<Unknown>& JSActivation::registerAt(int index) const
+{
+    ASSERT(isValidIndex(index));
+    return Base::registerAt(index);
+}
+
+} // namespace JSC
+
+#endif // JSActivation_h