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diff --git a/Source/JavaScriptCore/runtime/Arguments.h b/Source/JavaScriptCore/runtime/Arguments.h
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+/*
+ *  Copyright (C) 1999-2000 Harri Porten (porten@kde.org)
+ *  Copyright (C) 2003, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
+ *  Copyright (C) 2007 Cameron Zwarich (cwzwarich@uwaterloo.ca)
+ *  Copyright (C) 2007 Maks Orlovich
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Library 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
+ *  Library General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Library General Public License
+ *  along with this library; see the file COPYING.LIB.  If not, write to
+ *  the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ *  Boston, MA 02110-1301, USA.
+ *
+ */
+
+#ifndef Arguments_h
+#define Arguments_h
+
+#include "CodeOrigin.h"
+#include "JSActivation.h"
+#include "JSDestructibleObject.h"
+#include "JSFunction.h"
+#include "JSGlobalObject.h"
+#include "Interpreter.h"
+#include "ObjectConstructor.h"
+#include <wtf/StdLibExtras.h>
+
+namespace JSC {
+
+class Arguments : public JSDestructibleObject {
+    friend class JIT;
+    friend class JSArgumentsIterator;
+public:
+    typedef JSDestructibleObject Base;
+
+    static Arguments* create(VM& vm, CallFrame* callFrame)
+    {
+        Arguments* arguments = new (NotNull, allocateCell<Arguments>(vm.heap)) Arguments(callFrame);
+        arguments->finishCreation(callFrame);
+        return arguments;
+    }
+        
+    static Arguments* create(VM& vm, CallFrame* callFrame, InlineCallFrame* inlineCallFrame)
+    {
+        Arguments* arguments = new (NotNull, allocateCell<Arguments>(vm.heap)) Arguments(callFrame);
+        arguments->finishCreation(callFrame, inlineCallFrame);
+        return arguments;
+    }
+
+    enum { MaxArguments = 0x10000 };
+
+private:
+    enum NoParametersType { NoParameters };
+        
+    Arguments(CallFrame*);
+    Arguments(CallFrame*, NoParametersType);
+        
+public:
+    DECLARE_INFO;
+
+    static void visitChildren(JSCell*, SlotVisitor&);
+
+    void fillArgList(ExecState*, MarkedArgumentBuffer&);
+
+    uint32_t length(ExecState* exec) const 
+    {
+        if (UNLIKELY(m_overrodeLength))
+            return get(exec, exec->propertyNames().length).toUInt32(exec);
+        return m_numArguments; 
+    }
+        
+    void copyToArguments(ExecState*, CallFrame*, uint32_t length);
+    void tearOff(CallFrame*);
+    void tearOff(CallFrame*, InlineCallFrame*);
+    bool isTornOff() const { return m_registerArray.get(); }
+    void didTearOffActivation(ExecState*, JSActivation*);
+
+    static Structure* createStructure(VM& vm, JSGlobalObject* globalObject, JSValue prototype) 
+    { 
+        return Structure::create(vm, globalObject, prototype, TypeInfo(ObjectType, StructureFlags), info()); 
+    }
+    
+    static ptrdiff_t offsetOfNumArguments() { return OBJECT_OFFSETOF(Arguments, m_numArguments); }
+    static ptrdiff_t offsetOfRegisters() { return OBJECT_OFFSETOF(Arguments, m_registers); }
+    static ptrdiff_t offsetOfSlowArgumentData() { return OBJECT_OFFSETOF(Arguments, m_slowArgumentData); }
+    static ptrdiff_t offsetOfOverrodeLength() { return OBJECT_OFFSETOF(Arguments, m_overrodeLength); }
+    
+protected:
+    static const unsigned StructureFlags = OverridesGetOwnPropertySlot | InterceptsGetOwnPropertySlotByIndexEvenWhenLengthIsNotZero | OverridesVisitChildren | OverridesGetPropertyNames | JSObject::StructureFlags;
+
+    void finishCreation(CallFrame*);
+    void finishCreation(CallFrame*, InlineCallFrame*);
+
+private:
+    static void destroy(JSCell*);
+    static bool getOwnPropertySlot(JSObject*, ExecState*, PropertyName, PropertySlot&);
+    static bool getOwnPropertySlotByIndex(JSObject*, ExecState*, unsigned propertyName, PropertySlot&);
+    static void getOwnPropertyNames(JSObject*, ExecState*, PropertyNameArray&, EnumerationMode);
+    static void put(JSCell*, ExecState*, PropertyName, JSValue, PutPropertySlot&);
+    static void putByIndex(JSCell*, ExecState*, unsigned propertyName, JSValue, bool shouldThrow);
+    static bool deleteProperty(JSCell*, ExecState*, PropertyName);
+    static bool deletePropertyByIndex(JSCell*, ExecState*, unsigned propertyName);
+    static bool defineOwnProperty(JSObject*, ExecState*, PropertyName, const PropertyDescriptor&, bool shouldThrow);
+    void createStrictModeCallerIfNecessary(ExecState*);
+    void createStrictModeCalleeIfNecessary(ExecState*);
+
+    bool isArgument(size_t);
+    bool trySetArgument(VM&, size_t argument, JSValue);
+    JSValue tryGetArgument(size_t argument);
+    bool isDeletedArgument(size_t);
+    bool tryDeleteArgument(size_t);
+    WriteBarrierBase<Unknown>& argument(size_t);
+    void allocateSlowArguments();
+
+    void init(CallFrame*);
+
+    WriteBarrier<JSActivation> m_activation;
+
+    unsigned m_numArguments;
+
+    // We make these full byte booleans to make them easy to test from the JIT,
+    // and because even if they were single-bit booleans we still wouldn't save
+    // any space.
+    bool m_overrodeLength; 
+    bool m_overrodeCallee;
+    bool m_overrodeCaller;
+    bool m_isStrictMode;
+
+    WriteBarrierBase<Unknown>* m_registers;
+    std::unique_ptr<WriteBarrier<Unknown>[]> m_registerArray;
+
+    struct SlowArgumentData {
+        std::unique_ptr<SlowArgument[]> slowArguments;
+        int bytecodeToMachineCaptureOffset; // Add this if you have a bytecode offset into captured registers and you want the machine offset instead. Subtract if you want to do the opposite.
+    };
+    
+    std::unique_ptr<SlowArgumentData> m_slowArgumentData;
+
+    WriteBarrier<JSFunction> m_callee;
+};
+
+Arguments* asArguments(JSValue);
+
+inline Arguments* asArguments(JSValue value)
+{
+    ASSERT(asObject(value)->inherits(Arguments::info()));
+    return static_cast<Arguments*>(asObject(value));
+}
+
+inline Arguments::Arguments(CallFrame* callFrame)
+    : JSDestructibleObject(callFrame->vm(), callFrame->lexicalGlobalObject()->argumentsStructure())
+{
+}
+
+inline Arguments::Arguments(CallFrame* callFrame, NoParametersType)
+    : JSDestructibleObject(callFrame->vm(), callFrame->lexicalGlobalObject()->argumentsStructure())
+{
+}
+
+inline void Arguments::allocateSlowArguments()
+{
+    if (m_slowArgumentData)
+        return;
+    m_slowArgumentData = std::make_unique<SlowArgumentData>();
+    m_slowArgumentData->bytecodeToMachineCaptureOffset = 0;
+    m_slowArgumentData->slowArguments = std::make_unique<SlowArgument[]>(m_numArguments);
+    for (size_t i = 0; i < m_numArguments; ++i) {
+        ASSERT(m_slowArgumentData->slowArguments[i].status == SlowArgument::Normal);
+        m_slowArgumentData->slowArguments[i].index = CallFrame::argumentOffset(i);
+    }
+}
+
+inline bool Arguments::tryDeleteArgument(size_t argument)
+{
+    if (!isArgument(argument))
+        return false;
+    allocateSlowArguments();
+    m_slowArgumentData->slowArguments[argument].status = SlowArgument::Deleted;
+    return true;
+}
+
+inline bool Arguments::trySetArgument(VM& vm, size_t argument, JSValue value)
+{
+    if (!isArgument(argument))
+        return false;
+    this->argument(argument).set(vm, this, value);
+    return true;
+}
+
+inline JSValue Arguments::tryGetArgument(size_t argument)
+{
+    if (!isArgument(argument))
+        return JSValue();
+    return this->argument(argument).get();
+}
+
+inline bool Arguments::isDeletedArgument(size_t argument)
+{
+    if (argument >= m_numArguments)
+        return false;
+    if (!m_slowArgumentData)
+        return false;
+    if (m_slowArgumentData->slowArguments[argument].status != SlowArgument::Deleted)
+        return false;
+    return true;
+}
+
+inline bool Arguments::isArgument(size_t argument)
+{
+    if (argument >= m_numArguments)
+        return false;
+    if (m_slowArgumentData && m_slowArgumentData->slowArguments[argument].status == SlowArgument::Deleted)
+        return false;
+    return true;
+}
+
+inline WriteBarrierBase<Unknown>& Arguments::argument(size_t argument)
+{
+    ASSERT(isArgument(argument));
+    if (!m_slowArgumentData)
+        return m_registers[CallFrame::argumentOffset(argument)];
+
+    int index = m_slowArgumentData->slowArguments[argument].index;
+    if (!m_activation || m_slowArgumentData->slowArguments[argument].status != SlowArgument::Captured)
+        return m_registers[index];
+
+    return m_activation->registerAt(index - m_slowArgumentData->bytecodeToMachineCaptureOffset);
+}
+
+inline void Arguments::finishCreation(CallFrame* callFrame)
+{
+    Base::finishCreation(callFrame->vm());
+    ASSERT(inherits(info()));
+
+    JSFunction* callee = jsCast<JSFunction*>(callFrame->callee());
+    m_numArguments = callFrame->argumentCount();
+    m_registers = reinterpret_cast<WriteBarrierBase<Unknown>*>(callFrame->registers());
+    m_callee.set(callFrame->vm(), this, callee);
+    m_overrodeLength = false;
+    m_overrodeCallee = false;
+    m_overrodeCaller = false;
+    m_isStrictMode = callFrame->codeBlock()->isStrictMode();
+
+    CodeBlock* codeBlock = callFrame->codeBlock();
+    if (codeBlock->hasSlowArguments()) {
+        SymbolTable* symbolTable = codeBlock->symbolTable();
+        const SlowArgument* slowArguments = codeBlock->machineSlowArguments();
+        allocateSlowArguments();
+        size_t count = std::min<unsigned>(m_numArguments, symbolTable->parameterCount());
+        for (size_t i = 0; i < count; ++i)
+            m_slowArgumentData->slowArguments[i] = slowArguments[i];
+        m_slowArgumentData->bytecodeToMachineCaptureOffset =
+            codeBlock->framePointerOffsetToGetActivationRegisters();
+    }
+
+    // The bytecode generator omits op_tear_off_activation in cases of no
+    // declared parameters, so we need to tear off immediately.
+    if (m_isStrictMode || !callee->jsExecutable()->parameterCount())
+        tearOff(callFrame);
+}
+
+inline void Arguments::finishCreation(CallFrame* callFrame, InlineCallFrame* inlineCallFrame)
+{
+    Base::finishCreation(callFrame->vm());
+    ASSERT(inherits(info()));
+
+    JSFunction* callee = inlineCallFrame->calleeForCallFrame(callFrame);
+    m_numArguments = inlineCallFrame->arguments.size() - 1;
+    
+    if (m_numArguments) {
+        int offsetForArgumentOne = inlineCallFrame->arguments[1].virtualRegister().offset();
+        m_registers = reinterpret_cast<WriteBarrierBase<Unknown>*>(callFrame->registers()) + offsetForArgumentOne - virtualRegisterForArgument(1).offset();
+    } else
+        m_registers = 0;
+    m_callee.set(callFrame->vm(), this, callee);
+    m_overrodeLength = false;
+    m_overrodeCallee = false;
+    m_overrodeCaller = false;
+    m_isStrictMode = jsCast<FunctionExecutable*>(inlineCallFrame->executable.get())->isStrictMode();
+    ASSERT(!jsCast<FunctionExecutable*>(inlineCallFrame->executable.get())->symbolTable(inlineCallFrame->isCall ? CodeForCall : CodeForConstruct)->slowArguments());
+
+    // The bytecode generator omits op_tear_off_activation in cases of no
+    // declared parameters, so we need to tear off immediately.
+    if (m_isStrictMode || !callee->jsExecutable()->parameterCount())
+        tearOff(callFrame, inlineCallFrame);
+}
+
+} // namespace JSC
+
+#endif // Arguments_h