#ifndef StructureChain_h
#define StructureChain_h
#include "JSCell.h"
#include "JSObject.h"
#include "Structure.h"
#include <wtf/PassRefPtr.h>
#include <wtf/RefCounted.h>
#include <wtf/RefPtr.h>
#include <wtf/StdLibExtras.h>
namespace JSC {
class LLIntOffsetsExtractor;
class Structure;
class StructureChain : public JSCell {
friend class JIT;
public:
typedef JSCell Base;
static StructureChain* create(VM& vm, Structure* head)
{
StructureChain* chain = new (NotNull, allocateCell<StructureChain>(vm.heap)) StructureChain(vm, vm.structureChainStructure.get());
chain->finishCreation(vm, head);
return chain;
}
WriteBarrier<Structure>* head() { return m_vector.get(); }
static void visitChildren(JSCell*, SlotVisitor&);
static Structure* createStructure(VM& vm, JSGlobalObject* globalObject, JSValue prototype)
{
return Structure::create(vm, globalObject, prototype, TypeInfo(CompoundType, StructureFlags), info());
}
DECLARE_INFO;
static const bool needsDestruction = true;
static const bool hasImmortalStructure = true;
static void destroy(JSCell*);
protected:
static const unsigned StructureFlags = OverridesVisitChildren | StructureIsImmortal;
void finishCreation(VM& vm, Structure* head)
{
Base::finishCreation(vm);
size_t size = 0;
for (Structure* current = head; current; current = current->storedPrototype().isNull() ? 0 : asObject(current->storedPrototype())->structure())
++size;
m_vector = std::make_unique<WriteBarrier<Structure>[]>(size + 1);
size_t i = 0;
for (Structure* current = head; current; current = current->storedPrototype().isNull() ? 0 : asObject(current->storedPrototype())->structure())
m_vector[i++].set(vm, this, current);
}
private:
friend class LLIntOffsetsExtractor;
StructureChain(VM&, Structure*);
std::unique_ptr<WriteBarrier<Structure>[]> m_vector;
};
}
#endif // StructureChain_h