runtime/JSVariableObject.h

   1 /*
   2  * Copyright (C) 2007, 2008, 2012 Apple Inc. All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  *
   8  * 1.  Redistributions of source code must retain the above copyright
   9  *     notice, this list of conditions and the following disclaimer.
  10  * 2.  Redistributions in binary form must reproduce the above copyright
  11  *     notice, this list of conditions and the following disclaimer in the
  12  *     documentation and/or other materials provided with the distribution.
  13  * 3.  Neither the name of Apple Inc. ("Apple") nor the names of
  14  *     its contributors may be used to endorse or promote products derived
  15  *     from this software without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
  18  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  19  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  20  * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
  21  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  22  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  23  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  24  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27  */
  28
  29 #ifndef JSVariableObject_h
  30 #define JSVariableObject_h
  31
  32 #include "JSObject.h"
  33 #include "JSSymbolTableObject.h"
  34 #include "Register.h"
  35 #include "SymbolTable.h"
  36
  37 namespace JSC {
  38
  39 class LLIntOffsetsExtractor;
  40 class Register;
  41
  42 class JSVariableObject : public JSSymbolTableObject {
  43     friend class JIT;
  44     friend class LLIntOffsetsExtractor;
  45
  46 public:
  47     typedef JSSymbolTableObject Base;
  48
  49     WriteBarrierBase<Unknown>* registers() { return m_registers; }
  50     WriteBarrierBase<Unknown>& registerAt(int index) const { return m_registers[index]; }
  51
  52     WriteBarrierBase<Unknown>* const * addressOfRegisters() const { return &m_registers; }
  53     static size_t offsetOfRegisters() { return OBJECT_OFFSETOF(JSVariableObject, m_registers); }
  54
  55     DECLARE_INFO;
  56
  57 protected:
  58     static const unsigned StructureFlags = Base::StructureFlags;
  59
  60     JSVariableObject(
  61         VM& vm,
  62         Structure* structure,
  63         Register* registers,
  64         JSScope* scope,
  65         SymbolTable* symbolTable = 0)
  66         : Base(vm, structure, scope, symbolTable)
  67         , m_registers(reinterpret_cast<WriteBarrierBase<Unknown>*>(registers))
  68     {
  69     }
  70
  71     WriteBarrierBase<Unknown>* m_registers; // "r" in the stack.
  72 };
  73
  74 } // namespace JSC
  75
  76 #endif // JSVariableObject_h