JSVariableObject.h   [plain text]

/*
 * Copyright (C) 2007, 2008, 2012 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 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
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 */

#ifndef JSVariableObject_h
#define JSVariableObject_h

#include "JSObject.h"
#include "JSSymbolTableObject.h"
#include "Register.h"
#include "SymbolTable.h"

namespace JSC {

class LLIntOffsetsExtractor;
class Register;

class JSVariableObject : public JSSymbolTableObject {
    friend class JIT;
    friend class LLIntOffsetsExtractor;

public:
    typedef JSSymbolTableObject Base;

    WriteBarrierBase<Unknown>* registers() { return m_registers; }
    WriteBarrierBase<Unknown>& registerAt(int index) const { return m_registers[index]; }

    WriteBarrierBase<Unknown>* const * addressOfRegisters() const { return &m_registers; }
    static size_t offsetOfRegisters() { return OBJECT_OFFSETOF(JSVariableObject, m_registers); }

    DECLARE_INFO;

protected:
    static const unsigned StructureFlags = Base::StructureFlags;

    JSVariableObject(
        VM& vm,
        Structure* structure,
        Register* registers,
        JSScope* scope,
        SymbolTable* symbolTable = 0)
        : Base(vm, structure, scope, symbolTable)
        , m_registers(reinterpret_cast<WriteBarrierBase<Unknown>*>(registers))
    {
    }

    WriteBarrierBase<Unknown>* m_registers; // "r" in the stack.
};

} // namespace JSC

#endif // JSVariableObject_h