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 // FIXME: Rename to PropertyNameArray.
  32 class PropertyNameArrayData : public RefCounted<PropertyNameArrayData> {
  33 public:
  34     typedef Vector<Identifier, 20> PropertyNameVector;
  35
  36     static Ref<PropertyNameArrayData> create() { return adoptRef(*new PropertyNameArrayData); }
  37
  38     PropertyNameVector& propertyNameVector() { return m_propertyNameVector; }
  39
  40 private:
  41     PropertyNameArrayData()
  42     {
  43     }
  44
  45     PropertyNameVector m_propertyNameVector;
  46 };
  47
  48 // FIXME: Rename to PropertyNameArrayBuilder.
  49 class PropertyNameArray {
  50 public:
  51     PropertyNameArray(VM* vm)
  52         : m_data(PropertyNameArrayData::create())
  53         , m_vm(vm)
  54     {
  55     }
  56
  57     PropertyNameArray(ExecState* exec)
  58         : m_data(PropertyNameArrayData::create())
  59         , m_vm(&exec->vm())
  60     {
  61     }
  62
  63     VM* vm() { return m_vm; }
  64
  65     void add(uint32_t index)
  66     {
  67         add(Identifier::from(m_vm, index));
  68     }
  69
  70     void add(const Identifier&);
  71     void add(UniquedStringImpl*);
  72     void addKnownUnique(UniquedStringImpl*);
  73
  74     Identifier& operator[](unsigned i) { return m_data->propertyNameVector()[i]; }
  75     const Identifier& operator[](unsigned i) const { return m_data->propertyNameVector()[i]; }
  76
  77     void setData(PassRefPtr<PropertyNameArrayData> data) { m_data = data; }
  78     PropertyNameArrayData* data() { return m_data.get(); }
  79     PassRefPtr<PropertyNameArrayData> releaseData() { return m_data.release(); }
  80
  81     // FIXME: Remove these functions.
  82     bool canAddKnownUniqueForStructure() const { return m_data->propertyNameVector().isEmpty(); }
  83     typedef PropertyNameArrayData::PropertyNameVector::const_iterator const_iterator;
  84     size_t size() const { return m_data->propertyNameVector().size(); }
  85     const_iterator begin() const { return m_data->propertyNameVector().begin(); }
  86     const_iterator end() const { return m_data->propertyNameVector().end(); }
  87
  88 private:
  89     RefPtr<PropertyNameArrayData> m_data;
  90     HashSet<UniquedStringImpl*> m_set;
  91     VM* m_vm;
  92 };
  93
  94 ALWAYS_INLINE void PropertyNameArray::add(const Identifier& identifier)
  95 {
  96     add(identifier.impl());
  97 }
  98
  99 ALWAYS_INLINE void PropertyNameArray::addKnownUnique(UniquedStringImpl* identifier)
 100 {
 101     m_data->propertyNameVector().append(Identifier::fromUid(m_vm, identifier));
 102 }
 103
 104 ALWAYS_INLINE void PropertyNameArray::add(UniquedStringImpl* identifier)
 105 {
 106     static const unsigned setThreshold = 20;
 107
 108     ASSERT(identifier);
 109
 110     if (size() < setThreshold) {
 111         if (m_data->propertyNameVector().contains(identifier))
 112             return;
 113     } else {
 114         if (m_set.isEmpty()) {
 115             for (Identifier& name : m_data->propertyNameVector())
 116                 m_set.add(name.impl());
 117         }
 118         if (!m_set.add(identifier).isNewEntry)
 119             return;
 120     }
 121
 122     addKnownUnique(identifier);
 123 }
 124
 125 } // namespace JSC
 126
 127 #endif // PropertyNameArray_h