Home | History | Annotate | Download | only in runtime 
      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 PassRefPtr<Structure> createStructure(JSValue prototype)
     49         {
     50             return Structure::create(prototype, TypeInfo(CompoundType, OverridesMarkChildren), AnonymousSlotCount);
     51         }
     52 
     53         virtual ~JSPropertyNameIterator();
     54 
     55         virtual bool isPropertyNameIterator() const { return true; }
     56 
     57         virtual void markChildren(MarkStack&);
     58 
     59         bool getOffset(size_t i, int& offset)
     60         {
     61             if (i >= m_numCacheableSlots)
     62                 return false;
     63             offset = i;
     64             return true;
     65         }
     66 
     67         JSValue get(ExecState*, JSObject*, size_t i);
     68         size_t size() { return m_jsStringsSize; }
     69 
     70         void setCachedStructure(Structure* structure) { m_cachedStructure = structure; }
     71         Structure* cachedStructure() { return m_cachedStructure; }
     72 
     73         void setCachedPrototypeChain(NonNullPassRefPtr<StructureChain> cachedPrototypeChain) { m_cachedPrototypeChain = cachedPrototypeChain; }
     74         StructureChain* cachedPrototypeChain() { return m_cachedPrototypeChain.get(); }
     75 
     76     private:
     77         JSPropertyNameIterator(ExecState*, PropertyNameArrayData* propertyNameArrayData, size_t numCacheableSlot);
     78 
     79         Structure* m_cachedStructure;
     80         RefPtr<StructureChain> m_cachedPrototypeChain;
     81         uint32_t m_numCacheableSlots;
     82         uint32_t m_jsStringsSize;
     83         OwnArrayPtr<JSValue> m_jsStrings;
     84     };
     85 
     86     inline void Structure::setEnumerationCache(JSPropertyNameIterator* enumerationCache)
     87     {
     88         ASSERT(!isDictionary());
     89         m_enumerationCache = enumerationCache;
     90     }
     91 
     92     inline void Structure::clearEnumerationCache(JSPropertyNameIterator* enumerationCache)
     93     {
     94         m_enumerationCache.clear(enumerationCache);
     95     }
     96 
     97     inline JSPropertyNameIterator* Structure::enumerationCache()
     98     {
     99         return m_enumerationCache.get();
    100     }
    101 
    102 } // namespace JSC
    103 
    104 #endif // JSPropertyNameIterator_h
    105