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/*
* 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 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 JSVariableObject_h
#define JSVariableObject_h
#include "JSObject.h"
#include "JSSymbolTableObject.h"
#include "Register.h"
#include "SymbolTable.h"
#include <wtf/UnusedParam.h>
#include <wtf/OwnArrayPtr.h>
namespace JSC {
class LLIntOffsetsExtractor;
class Register;
class JSVariableObject : public JSSymbolTableObject {
friend class JIT;
friend class LLIntOffsetsExtractor;
public:
typedef JSSymbolTableObject Base;
WriteBarrier<Unknown>& registerAt(int index) const { return m_registers[index]; }
WriteBarrier<Unknown>* const * addressOfRegisters() const { return &m_registers; }
static size_t offsetOfRegisters() { return OBJECT_OFFSETOF(JSVariableObject, m_registers); }
JS_EXPORT_PRIVATE static void destroy(JSCell*);
protected:
static const unsigned StructureFlags = JSSymbolTableObject::StructureFlags;
JSVariableObject(JSGlobalData& globalData, Structure* structure, SymbolTable* symbolTable, Register* registers)
: JSSymbolTableObject(globalData, structure, symbolTable)
, m_registers(reinterpret_cast<WriteBarrier<Unknown>*>(registers))
{
}
void finishCreation(JSGlobalData& globalData)
{
Base::finishCreation(globalData);
COMPILE_ASSERT(sizeof(WriteBarrier<Unknown>) == sizeof(Register), Register_should_be_same_size_as_WriteBarrier);
}
PassOwnArrayPtr<WriteBarrier<Unknown> > copyRegisterArray(JSGlobalData&, WriteBarrier<Unknown>* src, size_t count, size_t callframeStarts);
void setRegisters(WriteBarrier<Unknown>* registers, PassOwnArrayPtr<WriteBarrier<Unknown> > registerArray);
WriteBarrier<Unknown>* m_registers; // "r" in the register file.
OwnArrayPtr<WriteBarrier<Unknown> > m_registerArray; // Independent copy of registers, used when a variable object copies its registers out of the register file.
};
inline PassOwnArrayPtr<WriteBarrier<Unknown> > JSVariableObject::copyRegisterArray(JSGlobalData& globalData, WriteBarrier<Unknown>* src, size_t count, size_t callframeStarts)
{
OwnArrayPtr<WriteBarrier<Unknown> > registerArray = adoptArrayPtr(new WriteBarrier<Unknown>[count]);
for (size_t i = 0; i < callframeStarts; i++)
registerArray[i].set(globalData, this, src[i].get());
for (size_t i = callframeStarts + RegisterFile::CallFrameHeaderSize; i < count; i++)
registerArray[i].set(globalData, this, src[i].get());
return registerArray.release();
}
inline void JSVariableObject::setRegisters(WriteBarrier<Unknown>* registers, PassOwnArrayPtr<WriteBarrier<Unknown> > registerArray)
{
ASSERT(registerArray != m_registerArray);
m_registerArray = registerArray;
m_registers = registers;
}
} // namespace JSC
#endif // JSVariableObject_h
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