#pragma once
#include "JSCJSValue.h"
namespace JSC {
class WeakHandleOwner;
class WeakImpl {
public:
enum State {
Live = 0x0,
Dead = 0x1,
Finalized = 0x2,
Deallocated = 0x3
};
enum {
StateMask = 0x3
};
WeakImpl();
WeakImpl(JSValue, WeakHandleOwner*, void* context);
State state();
void setState(State);
const JSValue& jsValue();
static ptrdiff_t offsetOfJSValue() { return OBJECT_OFFSETOF(WeakImpl, m_jsValue); }
WeakHandleOwner* weakHandleOwner();
static ptrdiff_t offsetOfWeakHandleOwner() { return OBJECT_OFFSETOF(WeakImpl, m_weakHandleOwner); }
void* context();
static WeakImpl* asWeakImpl(JSValue*);
private:
const JSValue m_jsValue;
WeakHandleOwner* m_weakHandleOwner;
void* m_context;
};
inline WeakImpl::WeakImpl()
: m_weakHandleOwner(0)
, m_context(0)
{
setState(Deallocated);
}
inline WeakImpl::WeakImpl(JSValue jsValue, WeakHandleOwner* weakHandleOwner, void* context)
: m_jsValue(jsValue)
, m_weakHandleOwner(weakHandleOwner)
, m_context(context)
{
ASSERT(state() == Live);
ASSERT(m_jsValue && m_jsValue.isCell());
}
inline WeakImpl::State WeakImpl::state()
{
return static_cast<State>(reinterpret_cast<uintptr_t>(m_weakHandleOwner) & StateMask);
}
inline void WeakImpl::setState(WeakImpl::State state)
{
ASSERT(state >= this->state());
m_weakHandleOwner = reinterpret_cast<WeakHandleOwner*>((reinterpret_cast<uintptr_t>(m_weakHandleOwner) & ~StateMask) | state);
}
inline const JSValue& WeakImpl::jsValue()
{
return m_jsValue;
}
inline WeakHandleOwner* WeakImpl::weakHandleOwner()
{
return reinterpret_cast<WeakHandleOwner*>((reinterpret_cast<uintptr_t>(m_weakHandleOwner) & ~StateMask));
}
inline void* WeakImpl::context()
{
return m_context;
}
inline WeakImpl* WeakImpl::asWeakImpl(JSValue* slot)
{
return reinterpret_cast_ptr<WeakImpl*>(reinterpret_cast_ptr<char*>(slot) + OBJECT_OFFSETOF(WeakImpl, m_jsValue));
}
}