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/*
* Copyright (C) 2011, 2012 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef SparseArrayValueMap_h
#define SparseArrayValueMap_h
#include "JSCell.h"
#include "JSTypeInfo.h"
#include "PropertyDescriptor.h"
#include "PutDirectIndexMode.h"
#include "WriteBarrier.h"
#include <wtf/HashMap.h>
#include <wtf/Platform.h>
namespace JSC {
struct SparseArrayEntry : public WriteBarrier<Unknown> {
typedef WriteBarrier<Unknown> Base;
SparseArrayEntry() : attributes(0) { }
JSValue get(ExecState*, JSObject*) const;
void get(PropertySlot&) const;
void get(PropertyDescriptor&) const;
JSValue getNonSparseMode() const;
unsigned attributes;
};
class SparseArrayValueMap : public JSCell {
public:
typedef JSCell Base;
private:
typedef HashMap<uint64_t, SparseArrayEntry, WTF::IntHash<uint64_t>, WTF::UnsignedWithZeroKeyHashTraits<uint64_t> > Map;
enum Flags {
Normal = 0,
SparseMode = 1,
LengthIsReadOnly = 2,
};
SparseArrayValueMap(JSGlobalData&);
~SparseArrayValueMap();
void finishCreation(JSGlobalData&);
static const unsigned StructureFlags = OverridesVisitChildren | JSCell::StructureFlags;
public:
static JS_EXPORTDATA const ClassInfo s_info;
typedef Map::iterator iterator;
typedef Map::const_iterator const_iterator;
typedef Map::AddResult AddResult;
static SparseArrayValueMap* create(JSGlobalData&);
static void destroy(JSCell*);
static Structure* createStructure(JSGlobalData&, JSGlobalObject*, JSValue prototype);
static void visitChildren(JSCell*, SlotVisitor&);
bool sparseMode()
{
return m_flags & SparseMode;
}
void setSparseMode()
{
m_flags = static_cast<Flags>(m_flags | SparseMode);
}
bool lengthIsReadOnly()
{
return m_flags & LengthIsReadOnly;
}
void setLengthIsReadOnly()
{
m_flags = static_cast<Flags>(m_flags | LengthIsReadOnly);
}
// These methods may mutate the contents of the map
void putEntry(ExecState*, JSObject*, unsigned, JSValue, bool shouldThrow);
bool putDirect(ExecState*, JSObject*, unsigned, JSValue, unsigned attributes, PutDirectIndexMode);
AddResult add(JSObject*, unsigned);
iterator find(unsigned i) { return m_map.find(i); }
// This should ASSERT the remove is valid (check the result of the find).
void remove(iterator it) { m_map.remove(it); }
void remove(unsigned i) { m_map.remove(i); }
// These methods do not mutate the contents of the map.
iterator notFound() { return m_map.end(); }
bool isEmpty() const { return m_map.isEmpty(); }
bool contains(unsigned i) const { return m_map.contains(i); }
size_t size() const { return m_map.size(); }
// Only allow const begin/end iteration.
const_iterator begin() const { return m_map.begin(); }
const_iterator end() const { return m_map.end(); }
private:
Map m_map;
Flags m_flags;
size_t m_reportedCapacity;
};
} // namespace JSC
#endif // SparseArrayValueMap_h
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