Source/JavaScriptCore/runtime/PropertyNameArray.h

/*
 *  Copyright (C) 2006, 2008, 2012 Apple Inc. All rights reserved.
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Library General Public
 *  License as published by the Free Software Foundation; either
 *  version 2 of the License, or (at your option) any later version.
 *
 *  This library is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  Library General Public License for more details.
 *
 *  You should have received a copy of the GNU Library General Public License
 *  along with this library; see the file COPYING.LIB.  If not, write to
 *  the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 *  Boston, MA 02110-1301, USA.
 *
 */

#ifndef PropertyNameArray_h
#define PropertyNameArray_h

#include "CallFrame.h"
#include "Identifier.h"
#include <wtf/HashSet.h>
#include <wtf/Vector.h>

namespace JSC {
    
    class Structure;
    class StructureChain;

    // FIXME: Rename to PropertyNameArray.
    class PropertyNameArrayData : public RefCounted<PropertyNameArrayData> {
    public:
        typedef Vector<Identifier, 20> PropertyNameVector;

        static PassRefPtr<PropertyNameArrayData> create() { return adoptRef(new PropertyNameArrayData); }

        PropertyNameVector& propertyNameVector() { return m_propertyNameVector; }

    private:
        PropertyNameArrayData()
        {
        }

        PropertyNameVector m_propertyNameVector;
    };

    // FIXME: Rename to PropertyNameArrayBuilder.
    class PropertyNameArray {
    public:
        PropertyNameArray(VM* vm)
            : m_data(PropertyNameArrayData::create())
            , m_vm(vm)
            , m_numCacheableSlots(0)
            , m_baseObject(0)
        {
        }

        PropertyNameArray(ExecState* exec)
            : m_data(PropertyNameArrayData::create())
            , m_vm(&exec->vm())
            , m_numCacheableSlots(0)
            , m_baseObject(0)
        {
        }

        VM* vm() { return m_vm; }

        void add(const Identifier& identifier) { add(identifier.impl()); }
        JS_EXPORT_PRIVATE void add(StringImpl*);
        void addKnownUnique(StringImpl* identifier) { m_data->propertyNameVector().append(Identifier(m_vm, identifier)); }

        Identifier& operator[](unsigned i) { return m_data->propertyNameVector()[i]; }
        const Identifier& operator[](unsigned i) const { return m_data->propertyNameVector()[i]; }

        void setData(PassRefPtr<PropertyNameArrayData> data) { m_data = data; }
        PropertyNameArrayData* data() { return m_data.get(); }
        PassRefPtr<PropertyNameArrayData> releaseData() { return m_data.release(); }

        // FIXME: Remove these functions.
        typedef PropertyNameArrayData::PropertyNameVector::const_iterator const_iterator;
        size_t size() const { return m_data->propertyNameVector().size(); }
        const_iterator begin() const { return m_data->propertyNameVector().begin(); }
        const_iterator end() const { return m_data->propertyNameVector().end(); }

        size_t numCacheableSlots() const { return m_numCacheableSlots; }
        void setNumCacheableSlotsForObject(JSObject* object, size_t numCacheableSlots)
        {
            if (object != m_baseObject)
                return;
            m_numCacheableSlots = numCacheableSlots;
        }
        void setBaseObject(JSObject* object)
        {
            if (m_baseObject)
                return;
            m_baseObject = object;
        }

    private:
        typedef HashSet<StringImpl*, PtrHash<StringImpl*>> IdentifierSet;

        RefPtr<PropertyNameArrayData> m_data;
        IdentifierSet m_set;
        VM* m_vm;
        size_t m_numCacheableSlots;
        JSObject* m_baseObject;
    };

} // namespace JSC

#endif // PropertyNameArray_h