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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 JSObject {
friend class JIT;
public:
SymbolTable& symbolTable() const { return *d->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() const = 0;
Register& registerAt(int index) const { return d->registers[index]; }
static PassRefPtr<Structure> createStructure(JSValue prototype)
{
return Structure::create(prototype, TypeInfo(ObjectType, StructureFlags), AnonymousSlotCount);
}
protected:
static const unsigned StructureFlags = OverridesGetPropertyNames | JSObject::StructureFlags;
// Subclasses of JSVariableObject can subclass this struct to add data
// without increasing their own size (since there's a hard limit on the
// size of a JSCell).
struct JSVariableObjectData {
JSVariableObjectData(SymbolTable* symbolTable, Register* registers)
: symbolTable(symbolTable)
, registers(registers)
{
ASSERT(symbolTable);
}
SymbolTable* symbolTable; // Maps name -> offset from "r" in register file.
Register* registers; // "r" in the register file.
OwnArrayPtr<Register> registerArray; // Independent copy of registers, used when a variable object copies its registers out of the register file.
private:
JSVariableObjectData(const JSVariableObjectData&);
JSVariableObjectData& operator=(const JSVariableObjectData&);
};
JSVariableObject(NonNullPassRefPtr<Structure> structure, JSVariableObjectData* data)
: JSObject(structure)
, d(data) // Subclass owns this pointer.
{
}
Register* copyRegisterArray(Register* src, size_t count);
void setRegisters(Register* r, Register* registerArray);
bool symbolTableGet(const Identifier&, PropertySlot&);
bool symbolTableGet(const Identifier&, PropertyDescriptor&);
bool symbolTableGet(const Identifier&, PropertySlot&, bool& slotIsWriteable);
bool symbolTablePut(const Identifier&, JSValue);
bool symbolTablePutWithAttributes(const Identifier&, JSValue, unsigned attributes);
JSVariableObjectData* d;
};
inline bool JSVariableObject::symbolTableGet(const Identifier& propertyName, PropertySlot& slot)
{
SymbolTableEntry entry = symbolTable().inlineGet(propertyName.ustring().rep());
if (!entry.isNull()) {
slot.setRegisterSlot(®isterAt(entry.getIndex()));
return true;
}
return false;
}
inline bool JSVariableObject::symbolTableGet(const Identifier& propertyName, PropertySlot& slot, bool& slotIsWriteable)
{
SymbolTableEntry entry = symbolTable().inlineGet(propertyName.ustring().rep());
if (!entry.isNull()) {
slot.setRegisterSlot(®isterAt(entry.getIndex()));
slotIsWriteable = !entry.isReadOnly();
return true;
}
return false;
}
inline bool JSVariableObject::symbolTablePut(const Identifier& propertyName, JSValue value)
{
ASSERT(!Heap::heap(value) || Heap::heap(value) == Heap::heap(this));
SymbolTableEntry entry = symbolTable().inlineGet(propertyName.ustring().rep());
if (entry.isNull())
return false;
if (entry.isReadOnly())
return true;
registerAt(entry.getIndex()) = value;
return true;
}
inline bool JSVariableObject::symbolTablePutWithAttributes(const Identifier& propertyName, JSValue value, unsigned attributes)
{
ASSERT(!Heap::heap(value) || Heap::heap(value) == Heap::heap(this));
SymbolTable::iterator iter = symbolTable().find(propertyName.ustring().rep());
if (iter == symbolTable().end())
return false;
SymbolTableEntry& entry = iter->second;
ASSERT(!entry.isNull());
entry.setAttributes(attributes);
registerAt(entry.getIndex()) = value;
return true;
}
inline Register* JSVariableObject::copyRegisterArray(Register* src, size_t count)
{
Register* registerArray = new Register[count];
memcpy(registerArray, src, count * sizeof(Register));
return registerArray;
}
inline void JSVariableObject::setRegisters(Register* registers, Register* registerArray)
{
ASSERT(registerArray != d->registerArray.get());
d->registerArray.set(registerArray);
d->registers = registers;
}
} // namespace JSC
#endif // JSVariableObject_h
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