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/*
* Copyright (C) 2007, 2008 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 "Register.h"
#include "SymbolTable.h"
#include "UnusedParam.h"
#include <wtf/OwnArrayPtr.h>
#include <wtf/UnusedParam.h>
namespace JSC {
class Register;
class JSVariableObject : public JSNonFinalObject {
friend class JIT;
public:
SymbolTable& symbolTable() const { return *m_symbolTable; }
virtual void putWithAttributes(ExecState*, const Identifier&, JSValue, unsigned attributes) = 0;
virtual bool deleteProperty(ExecState*, const Identifier&);
virtual void getOwnPropertyNames(ExecState*, PropertyNameArray&, EnumerationMode mode = ExcludeDontEnumProperties);
virtual bool isVariableObject() const;
virtual bool isDynamicScope(bool& requiresDynamicChecks) const = 0;
WriteBarrier<Unknown>& registerAt(int index) const { return m_registers[index]; }
WriteBarrier<Unknown>* const * addressOfRegisters() const { return &m_registers; }
static PassRefPtr<Structure> createStructure(JSGlobalData& globalData, JSValue prototype)
{
return Structure::create(globalData, prototype, TypeInfo(ObjectType, StructureFlags), AnonymousSlotCount, &s_info);
}
protected:
static const unsigned StructureFlags = OverridesGetPropertyNames | JSObject::StructureFlags;
JSVariableObject(NonNullPassRefPtr<Structure> structure, SymbolTable* symbolTable, Register* registers)
: JSNonFinalObject(structure)
, m_symbolTable(symbolTable)
, m_registers(reinterpret_cast<WriteBarrier<Unknown>*>(registers))
{
ASSERT(m_symbolTable);
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);
void setRegisters(WriteBarrier<Unknown>* registers, PassOwnArrayPtr<WriteBarrier<Unknown> > registerArray);
bool symbolTableGet(const Identifier&, PropertySlot&);
bool symbolTableGet(const Identifier&, PropertyDescriptor&);
bool symbolTableGet(const Identifier&, PropertySlot&, bool& slotIsWriteable);
bool symbolTablePut(JSGlobalData&, const Identifier&, JSValue);
bool symbolTablePutWithAttributes(JSGlobalData&, const Identifier&, JSValue, unsigned attributes);
SymbolTable* m_symbolTable; // Maps name -> offset from "r" in register file.
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 bool JSVariableObject::symbolTableGet(const Identifier& propertyName, PropertySlot& slot)
{
SymbolTableEntry entry = symbolTable().inlineGet(propertyName.impl());
if (!entry.isNull()) {
slot.setValue(registerAt(entry.getIndex()).get());
return true;
}
return false;
}
inline bool JSVariableObject::symbolTableGet(const Identifier& propertyName, PropertySlot& slot, bool& slotIsWriteable)
{
SymbolTableEntry entry = symbolTable().inlineGet(propertyName.impl());
if (!entry.isNull()) {
slot.setValue(registerAt(entry.getIndex()).get());
slotIsWriteable = !entry.isReadOnly();
return true;
}
return false;
}
inline bool JSVariableObject::symbolTablePut(JSGlobalData& globalData, const Identifier& propertyName, JSValue value)
{
ASSERT(!Heap::heap(value) || Heap::heap(value) == Heap::heap(this));
SymbolTableEntry entry = symbolTable().inlineGet(propertyName.impl());
if (entry.isNull())
return false;
if (entry.isReadOnly())
return true;
registerAt(entry.getIndex()).set(globalData, this, value);
return true;
}
inline bool JSVariableObject::symbolTablePutWithAttributes(JSGlobalData& globalData, const Identifier& propertyName, JSValue value, unsigned attributes)
{
ASSERT(!Heap::heap(value) || Heap::heap(value) == Heap::heap(this));
SymbolTable::iterator iter = symbolTable().find(propertyName.impl());
if (iter == symbolTable().end())
return false;
SymbolTableEntry& entry = iter->second;
ASSERT(!entry.isNull());
entry.setAttributes(attributes);
registerAt(entry.getIndex()).set(globalData, this, value);
return true;
}
inline PassOwnArrayPtr<WriteBarrier<Unknown> > JSVariableObject::copyRegisterArray(JSGlobalData& globalData, WriteBarrier<Unknown>* src, size_t count)
{
OwnArrayPtr<WriteBarrier<Unknown> > registerArray = adoptArrayPtr(new WriteBarrier<Unknown>[count]);
for (size_t i = 0; 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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