runtime/JSPropertyNameIterator.h

   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     class LLIntOffsetsExtractor;
  42
  43     class JSPropertyNameIterator : public JSCell {
  44         friend class JIT;
  45
  46     public:
  47         typedef JSCell Base;
  48
  49         static JSPropertyNameIterator* create(ExecState*, JSObject*);
  50         static JSPropertyNameIterator* create(ExecState* exec, PropertyNameArrayData* propertyNameArrayData, size_t numCacheableSlot)
  51         {
  52             JSPropertyNameIterator* iterator = new (NotNull, allocateCell<JSPropertyNameIterator>(*exec->heap())) JSPropertyNameIterator(exec, propertyNameArrayData, numCacheableSlot);
  53             iterator->finishCreation(exec, propertyNameArrayData);
  54             return iterator;
  55         }
  56
  57         static void destroy(JSCell*);
  58
  59         static Structure* createStructure(JSGlobalData& globalData, JSGlobalObject* globalObject, JSValue prototype)
  60         {
  61             return Structure::create(globalData, globalObject, prototype, TypeInfo(CompoundType, OverridesVisitChildren), &s_info);
  62         }
  63
  64         static void visitChildren(JSCell*, SlotVisitor&);
  65
  66         bool getOffset(size_t i, int& offset)
  67         {
  68             if (i >= m_numCacheableSlots)
  69                 return false;
  70             offset = i;
  71             return true;
  72         }
  73
  74         JSValue get(ExecState*, JSObject*, size_t i);
  75         size_t size() { return m_jsStringsSize; }
  76
  77         void setCachedStructure(JSGlobalData& globalData, Structure* structure)
  78         {
  79             ASSERT(!m_cachedStructure);
  80             ASSERT(structure);
  81             m_cachedStructure.set(globalData, this, structure);
  82         }
  83         Structure* cachedStructure() { return m_cachedStructure.get(); }
  84
  85         void setCachedPrototypeChain(JSGlobalData& globalData, StructureChain* cachedPrototypeChain) { m_cachedPrototypeChain.set(globalData, this, cachedPrototypeChain); }
  86         StructureChain* cachedPrototypeChain() { return m_cachedPrototypeChain.get(); }
  87
  88         static const ClassInfo s_info;
  89
  90     protected:
  91         void finishCreation(ExecState* exec, PropertyNameArrayData* propertyNameArrayData)
  92         {
  93             Base::finishCreation(exec->globalData());
  94             PropertyNameArrayData::PropertyNameVector& propertyNameVector = propertyNameArrayData->propertyNameVector();
  95             for (size_t i = 0; i < m_jsStringsSize; ++i)
  96                 m_jsStrings[i].set(exec->globalData(), this, jsOwnedString(exec, propertyNameVector[i].ustring()));
  97         }
  98
  99     private:
 100         friend class LLIntOffsetsExtractor;
 101
 102         JSPropertyNameIterator(ExecState*, PropertyNameArrayData* propertyNameArrayData, size_t numCacheableSlot);
 103
 104         WriteBarrier<Structure> m_cachedStructure;
 105         WriteBarrier<StructureChain> m_cachedPrototypeChain;
 106         uint32_t m_numCacheableSlots;
 107         uint32_t m_jsStringsSize;
 108         OwnArrayPtr<WriteBarrier<Unknown> > m_jsStrings;
 109     };
 110
 111     inline void Structure::setEnumerationCache(JSGlobalData& globalData, JSPropertyNameIterator* enumerationCache)
 112     {
 113         ASSERT(!isDictionary());
 114         m_enumerationCache.set(globalData, this, enumerationCache);
 115     }
 116
 117     inline JSPropertyNameIterator* Structure::enumerationCache()
 118     {
 119         return m_enumerationCache.get();
 120     }
 121
 122     ALWAYS_INLINE JSPropertyNameIterator* Register::propertyNameIterator() const
 123     {
 124         return jsCast<JSPropertyNameIterator*>(jsValue().asCell());
 125     }
 126
 127 } // namespace JSC
 128
 129 #endif // JSPropertyNameIterator_h