StructureChain.h 3.24 KB
Newer Older
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25
/*
 * Copyright (C) 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.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``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 COMPUTER, INC. OR
 * 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. 
 */

darin@apple.com's avatar
darin@apple.com committed
26 27
#ifndef StructureChain_h
#define StructureChain_h
28

29
#include "JSCell.h"
30
#include "JSObject.h"
31
#include "Structure.h"
32

33 34 35 36 37 38 39
#include <wtf/OwnArrayPtr.h>
#include <wtf/PassRefPtr.h>
#include <wtf/RefCounted.h>
#include <wtf/RefPtr.h>

namespace JSC {

darin@apple.com's avatar
darin@apple.com committed
40
    class Structure;
41

42
    class StructureChain : public JSCell {
43 44
        friend class JIT;

45
    public:
46 47
        typedef JSCell Base;

48 49
        static StructureChain* create(JSGlobalData& globalData, Structure* head)
        { 
50 51 52
            StructureChain* chain = new (allocateCell<StructureChain>(globalData.heap)) StructureChain(globalData, globalData.structureChainStructure.get());
            chain->finishCreation(globalData, head);
            return chain;
53
        }
54
        WriteBarrier<Structure>* head() { return m_vector.get(); }
55
        void visitChildren(SlotVisitor&);
56

57
        static Structure* createStructure(JSGlobalData& globalData, JSValue prototype) { return Structure::create(globalData, prototype, TypeInfo(CompoundType, OverridesVisitChildren), 0, &s_info); }
58 59
        
        static ClassInfo s_info;
60

61 62 63 64 65 66 67 68 69 70 71 72 73 74 75
    protected:
        void finishCreation(JSGlobalData& globalData, Structure* head)
        {
            Base::finishCreation(globalData);
            size_t size = 0;
            for (Structure* current = head; current; current = current->storedPrototype().isNull() ? 0 : asObject(current->storedPrototype())->structure())
                ++size;
    
            m_vector = adoptArrayPtr(new WriteBarrier<Structure>[size + 1]);

            size_t i = 0;
            for (Structure* current = head; current; current = current->storedPrototype().isNull() ? 0 : asObject(current->storedPrototype())->structure())
                m_vector[i++].set(globalData, this, current);
        }

76
    private:
77
        StructureChain(JSGlobalData&, Structure*);
78
        ~StructureChain();
79
        OwnArrayPtr<WriteBarrier<Structure> > m_vector;
80 81 82 83
    };

} // namespace JSC

darin@apple.com's avatar
darin@apple.com committed
84
#endif // StructureChain_h