SparseArrayValueMap.h [plain text]
#pragma once
#include "JSCast.h"
#include "JSTypeInfo.h"
#include "PropertyDescriptor.h"
#include "PutDirectIndexMode.h"
#include "WriteBarrier.h"
#include <wtf/HashMap.h>
namespace JSC {
class SparseArrayValueMap;
class SparseArrayEntry : private WriteBarrier<Unknown> {
WTF_MAKE_FAST_ALLOCATED;
public:
using Base = WriteBarrier<Unknown>;
SparseArrayEntry()
{
Base::setWithoutWriteBarrier(jsUndefined());
}
void get(JSObject*, PropertySlot&) const;
void get(PropertyDescriptor&) const;
bool put(ExecState*, JSValue thisValue, SparseArrayValueMap*, JSValue, bool shouldThrow);
JSValue getNonSparseMode() const;
JSValue getConcurrently() const;
unsigned attributes() const { return m_attributes; }
void forceSet(unsigned attributes)
{
if (isX86())
WTF::storeStoreFence();
m_attributes = attributes;
}
void forceSet(VM& vm, JSCell* map, JSValue value, unsigned attributes)
{
Base::set(vm, map, value);
forceSet(attributes);
}
WriteBarrier<Unknown>& asValue() { return *this; }
private:
unsigned m_attributes { 0 };
};
class SparseArrayValueMap final : public JSCell {
public:
typedef JSCell Base;
static const unsigned StructureFlags = Base::StructureFlags | StructureIsImmortal;
private:
typedef HashMap<uint64_t, SparseArrayEntry, WTF::IntHash<uint64_t>, WTF::UnsignedWithZeroKeyHashTraits<uint64_t>> Map;
enum Flags {
Normal = 0,
SparseMode = 1,
LengthIsReadOnly = 2,
};
SparseArrayValueMap(VM&);
void finishCreation(VM&);
public:
DECLARE_EXPORT_INFO;
typedef Map::iterator iterator;
typedef Map::const_iterator const_iterator;
typedef Map::AddResult AddResult;
static SparseArrayValueMap* create(VM&);
static const bool needsDestruction = true;
static void destroy(JSCell*);
static Structure* createStructure(VM&, 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);
}
bool 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); }
void remove(iterator it);
void remove(unsigned i);
JSValue getConcurrently(unsigned index);
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(); }
const_iterator begin() const { return m_map.begin(); }
const_iterator end() const { return m_map.end(); }
private:
Map m_map;
Flags m_flags { Normal };
size_t m_reportedCapacity { 0 };
};
}