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      1 /*
      2  * Copyright (C) 2008, 2009 Apple Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions
      6  * are met:
      7  *
      8  * 1.  Redistributions of source code must retain the above copyright
      9  *     notice, this list of conditions and the following disclaimer.
     10  * 2.  Redistributions in binary form must reproduce the above copyright
     11  *     notice, this list of conditions and the following disclaimer in the
     12  *     documentation and/or other materials provided with the distribution.
     13  * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
     14  *     its contributors may be used to endorse or promote products derived
     15  *     from this software without specific prior written permission.
     16  *
     17  * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
     18  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     19  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
     20  * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
     21  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
     22  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     23  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
     24  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     27  */
     28 
     29 #ifndef JSPropertyNameIterator_h
     30 #define JSPropertyNameIterator_h
     31 
     32 #include "JSObject.h"
     33 #include "JSString.h"
     34 #include "Operations.h"
     35 #include "PropertyNameArray.h"
     36 
     37 namespace JSC {
     38 
     39     class Identifier;
     40     class JSObject;
     41 
     42     class JSPropertyNameIterator : public JSCell {
     43         friend class JIT;
     44 
     45     public:
     46         static JSPropertyNameIterator* create(ExecState*, JSObject*);
     47 
     48         static Structure* createStructure(JSGlobalData& globalData, JSValue prototype)
     49         {
     50             return Structure::create(globalData, prototype, TypeInfo(CompoundType, OverridesMarkChildren), AnonymousSlotCount, &s_info);
     51         }
     52 
     53         virtual bool isPropertyNameIterator() const { return true; }
     54 
     55         virtual void markChildren(MarkStack&);
     56 
     57         bool getOffset(size_t i, int& offset)
     58         {
     59             if (i >= m_numCacheableSlots)
     60                 return false;
     61             offset = i;
     62             return true;
     63         }
     64 
     65         JSValue get(ExecState*, JSObject*, size_t i);
     66         size_t size() { return m_jsStringsSize; }
     67 
     68         void setCachedStructure(JSGlobalData& globalData, Structure* structure)
     69         {
     70             ASSERT(!m_cachedStructure);
     71             ASSERT(structure);
     72             m_cachedStructure.set(globalData, this, structure);
     73         }
     74         Structure* cachedStructure() { return m_cachedStructure.get(); }
     75 
     76         void setCachedPrototypeChain(JSGlobalData& globalData, StructureChain* cachedPrototypeChain) { m_cachedPrototypeChain.set(globalData, this, cachedPrototypeChain); }
     77         StructureChain* cachedPrototypeChain() { return m_cachedPrototypeChain.get(); }
     78 
     79     private:
     80         static const ClassInfo s_info;
     81         JSPropertyNameIterator(ExecState*, PropertyNameArrayData* propertyNameArrayData, size_t numCacheableSlot);
     82 
     83         WriteBarrier<Structure> m_cachedStructure;
     84         WriteBarrier<StructureChain> m_cachedPrototypeChain;
     85         uint32_t m_numCacheableSlots;
     86         uint32_t m_jsStringsSize;
     87         OwnArrayPtr<WriteBarrier<Unknown> > m_jsStrings;
     88     };
     89 
     90     inline void Structure::setEnumerationCache(JSGlobalData& globalData, JSPropertyNameIterator* enumerationCache)
     91     {
     92         ASSERT(!isDictionary());
     93         m_enumerationCache.set(globalData, this, enumerationCache);
     94     }
     95 
     96     inline JSPropertyNameIterator* Structure::enumerationCache()
     97     {
     98         return m_enumerationCache.get();
     99     }
    100 
    101     ALWAYS_INLINE JSPropertyNameIterator* Register::propertyNameIterator() const
    102     {
    103         return static_cast<JSPropertyNameIterator*>(jsValue().asCell());
    104     }
    105 
    106 } // namespace JSC
    107 
    108 #endif // JSPropertyNameIterator_h
    109