#ifndef ArrayStorage_h
#define ArrayStorage_h
#include "ArrayConventions.h"
#include "Butterfly.h"
#include "IndexingHeader.h"
#include "SparseArrayValueMap.h"
#include "WriteBarrier.h"
#include <wtf/Noncopyable.h>
namespace JSC {
struct ArrayStorage {
WTF_MAKE_NONCOPYABLE(ArrayStorage);
private:
ArrayStorage() { } public:
static ArrayStorage* from(Butterfly* butterfly) { return reinterpret_cast_ptr<ArrayStorage*>(butterfly); }
static ArrayStorage* from(IndexingHeader* indexingHeader) { return indexingHeader->arrayStorage(); }
Butterfly* butterfly() { return reinterpret_cast<Butterfly*>(this); }
IndexingHeader* indexingHeader() { return IndexingHeader::from(this); }
const IndexingHeader* indexingHeader() const { return IndexingHeader::from(this); }
unsigned length() const { return indexingHeader()->publicLength(); }
void setLength(unsigned length) { indexingHeader()->setPublicLength(length); }
unsigned vectorLength() { return indexingHeader()->vectorLength(); }
void setVectorLength(unsigned length) { indexingHeader()->setVectorLength(length); }
ALWAYS_INLINE void copyHeaderFromDuringGC(const ArrayStorage& other)
{
m_sparseMap.copyFrom(other.m_sparseMap);
m_indexBias = other.m_indexBias;
m_numValuesInVector = other.m_numValuesInVector;
}
bool hasHoles() const
{
return m_numValuesInVector != length();
}
bool inSparseMode()
{
return m_sparseMap && m_sparseMap->sparseMode();
}
ContiguousJSValues vector() { return ContiguousJSValues(m_vector, vectorLength()); }
WriteBarrier<SparseArrayValueMap> m_sparseMap;
unsigned m_indexBias;
unsigned m_numValuesInVector;
#if USE(JSVALUE32_64)
uintptr_t m_padding;
#endif
WriteBarrier<Unknown> m_vector[1];
static ptrdiff_t lengthOffset() { return Butterfly::offsetOfPublicLength(); }
static ptrdiff_t vectorLengthOffset() { return Butterfly::offsetOfVectorLength(); }
static ptrdiff_t numValuesInVectorOffset() { return OBJECT_OFFSETOF(ArrayStorage, m_numValuesInVector); }
static ptrdiff_t vectorOffset() { return OBJECT_OFFSETOF(ArrayStorage, m_vector); }
static ptrdiff_t indexBiasOffset() { return OBJECT_OFFSETOF(ArrayStorage, m_indexBias); }
static ptrdiff_t sparseMapOffset() { return OBJECT_OFFSETOF(ArrayStorage, m_sparseMap); }
static size_t sizeFor(unsigned vectorLength)
{
return ArrayStorage::vectorOffset() + vectorLength * sizeof(WriteBarrier<Unknown>);
}
};
}
#endif // ArrayStorage_h