runtime/PropertyNameArray.h

   1 /*
   2  *  Copyright (C) 2006, 2008, 2012 Apple Inc. All rights reserved.
   3  *
   4  *  This library is free software; you can redistribute it and/or
   5  *  modify it under the terms of the GNU Library General Public
   6  *  License as published by the Free Software Foundation; either
   7  *  version 2 of the License, or (at your option) any later version.
   8  *
   9  *  This library is distributed in the hope that it will be useful,
  10  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  *  Library General Public License for more details.
  13  *
  14  *  You should have received a copy of the GNU Library General Public License
  15  *  along with this library; see the file COPYING.LIB.  If not, write to
  16  *  the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  17  *  Boston, MA 02110-1301, USA.
  18  *
  19  */
  20
  21 #ifndef PropertyNameArray_h
  22 #define PropertyNameArray_h
  23
  24 #include "CallFrame.h"
  25 #include "Identifier.h"
  26 #include <wtf/HashSet.h>
  27 #include <wtf/Vector.h>
  28
  29 namespace JSC {
  30
  31     class Structure;
  32     class StructureChain;
  33
  34     // FIXME: Rename to PropertyNameArray.
  35     class PropertyNameArrayData : public RefCounted<PropertyNameArrayData> {
  36     public:
  37         typedef Vector<Identifier, 20> PropertyNameVector;
  38
  39         static PassRefPtr<PropertyNameArrayData> create() { return adoptRef(new PropertyNameArrayData); }
  40
  41         PropertyNameVector& propertyNameVector() { return m_propertyNameVector; }
  42
  43     private:
  44         PropertyNameArrayData()
  45         {
  46         }
  47
  48         PropertyNameVector m_propertyNameVector;
  49     };
  50
  51     // FIXME: Rename to PropertyNameArrayBuilder.
  52     class PropertyNameArray {
  53     public:
  54         PropertyNameArray(VM* vm)
  55             : m_data(PropertyNameArrayData::create())
  56             , m_vm(vm)
  57             , m_numCacheableSlots(0)
  58             , m_baseObject(0)
  59         {
  60         }
  61
  62         PropertyNameArray(ExecState* exec)
  63             : m_data(PropertyNameArrayData::create())
  64             , m_vm(&exec->vm())
  65             , m_numCacheableSlots(0)
  66             , m_baseObject(0)
  67         {
  68         }
  69
  70         VM* vm() { return m_vm; }
  71
  72         void add(const Identifier& identifier) { add(identifier.impl()); }
  73         JS_EXPORT_PRIVATE void add(StringImpl*);
  74         void addKnownUnique(StringImpl* identifier) { m_data->propertyNameVector().append(Identifier(m_vm, identifier)); }
  75
  76         Identifier& operator[](unsigned i) { return m_data->propertyNameVector()[i]; }
  77         const Identifier& operator[](unsigned i) const { return m_data->propertyNameVector()[i]; }
  78
  79         void setData(PassRefPtr<PropertyNameArrayData> data) { m_data = data; }
  80         PropertyNameArrayData* data() { return m_data.get(); }
  81         PassRefPtr<PropertyNameArrayData> releaseData() { return m_data.release(); }
  82
  83         // FIXME: Remove these functions.
  84         typedef PropertyNameArrayData::PropertyNameVector::const_iterator const_iterator;
  85         size_t size() const { return m_data->propertyNameVector().size(); }
  86         const_iterator begin() const { return m_data->propertyNameVector().begin(); }
  87         const_iterator end() const { return m_data->propertyNameVector().end(); }
  88
  89         size_t numCacheableSlots() const { return m_numCacheableSlots; }
  90         void setNumCacheableSlotsForObject(JSObject* object, size_t numCacheableSlots)
  91         {
  92             if (object != m_baseObject)
  93                 return;
  94             m_numCacheableSlots = numCacheableSlots;
  95         }
  96         void setBaseObject(JSObject* object)
  97         {
  98             if (m_baseObject)
  99                 return;
 100             m_baseObject = object;
 101         }
 102
 103     private:
 104         typedef HashSet<StringImpl*, PtrHash<StringImpl*>> IdentifierSet;
 105
 106         RefPtr<PropertyNameArrayData> m_data;
 107         IdentifierSet m_set;
 108         VM* m_vm;
 109         size_t m_numCacheableSlots;
 110         JSObject* m_baseObject;
 111     };
 112
 113 } // namespace JSC
 114
 115 #endif // PropertyNameArray_h