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/OwnArrayPtr.h>
  28 #include <wtf/Vector.h>
  29
  30 namespace JSC {
  31
  32     class Structure;
  33     class StructureChain;
  34
  35     // FIXME: Rename to PropertyNameArray.
  36     class PropertyNameArrayData : public RefCounted<PropertyNameArrayData> {
  37     public:
  38         typedef Vector<Identifier, 20> PropertyNameVector;
  39
  40         static PassRefPtr<PropertyNameArrayData> create() { return adoptRef(new PropertyNameArrayData); }
  41
  42         PropertyNameVector& propertyNameVector() { return m_propertyNameVector; }
  43
  44     private:
  45         PropertyNameArrayData()
  46         {
  47         }
  48
  49         PropertyNameVector m_propertyNameVector;
  50     };
  51
  52     // FIXME: Rename to PropertyNameArrayBuilder.
  53     class PropertyNameArray {
  54     public:
  55         PropertyNameArray(VM* vm)
  56             : m_data(PropertyNameArrayData::create())
  57             , m_vm(vm)
  58             , m_numCacheableSlots(0)
  59             , m_baseObject(0)
  60         {
  61         }
  62
  63         PropertyNameArray(ExecState* exec)
  64             : m_data(PropertyNameArrayData::create())
  65             , m_vm(&exec->vm())
  66             , m_numCacheableSlots(0)
  67             , m_baseObject(0)
  68         {
  69         }
  70
  71         VM* vm() { return m_vm; }
  72
  73         void add(const Identifier& identifier) { add(identifier.impl()); }
  74         JS_EXPORT_PRIVATE void add(StringImpl*);
  75         void addKnownUnique(StringImpl* identifier) { m_data->propertyNameVector().append(Identifier(m_vm, identifier)); }
  76
  77         Identifier& operator[](unsigned i) { return m_data->propertyNameVector()[i]; }
  78         const Identifier& operator[](unsigned i) const { return m_data->propertyNameVector()[i]; }
  79
  80         void setData(PassRefPtr<PropertyNameArrayData> data) { m_data = data; }
  81         PropertyNameArrayData* data() { return m_data.get(); }
  82         PassRefPtr<PropertyNameArrayData> releaseData() { return m_data.release(); }
  83
  84         // FIXME: Remove these functions.
  85         typedef PropertyNameArrayData::PropertyNameVector::const_iterator const_iterator;
  86         size_t size() const { return m_data->propertyNameVector().size(); }
  87         const_iterator begin() const { return m_data->propertyNameVector().begin(); }
  88         const_iterator end() const { return m_data->propertyNameVector().end(); }
  89
  90         size_t numCacheableSlots() const { return m_numCacheableSlots; }
  91         void setNumCacheableSlotsForObject(JSObject* object, size_t numCacheableSlots)
  92         {
  93             if (object != m_baseObject)
  94                 return;
  95             m_numCacheableSlots = numCacheableSlots;
  96         }
  97         void setBaseObject(JSObject* object)
  98         {
  99             if (m_baseObject)
 100                 return;
 101             m_baseObject = object;
 102         }
 103
 104     private:
 105         typedef HashSet<StringImpl*, PtrHash<StringImpl*> > IdentifierSet;
 106
 107         RefPtr<PropertyNameArrayData> m_data;
 108         IdentifierSet m_set;
 109         VM* m_vm;
 110         size_t m_numCacheableSlots;
 111         JSObject* m_baseObject;
 112     };
 113
 114 } // namespace JSC
 115
 116 #endif // PropertyNameArray_h