JSFinalizationRegistry.h [plain text]
#pragma once
#include "JSInternalFieldObjectImpl.h"
namespace JSC {
class JSFinalizationRegistry final : public JSInternalFieldObjectImpl<1> {
public:
using Base = JSInternalFieldObjectImpl<1>;
enum class Field : uint8_t {
Callback,
};
static size_t allocationSize(Checked<size_t> inlineCapacity)
{
ASSERT_UNUSED(inlineCapacity, inlineCapacity == 0U);
return sizeof(JSFinalizationRegistry);
}
template<typename CellType, SubspaceAccess mode>
static IsoSubspace* subspaceFor(VM& vm)
{
return vm.finalizationRegistrySpace<mode>();
}
static std::array<JSValue, numberOfInternalFields> initialValues()
{
return { {
jsNull(),
} };
}
const WriteBarrier<Unknown>& internalField(Field field) const { return Base::internalField(static_cast<uint32_t>(field)); }
WriteBarrier<Unknown>& internalField(Field field) { return Base::internalField(static_cast<uint32_t>(field)); }
JSObject* callback() const { return jsCast<JSObject*>(internalField(Field::Callback).get()); }
static JSFinalizationRegistry* create(VM&, Structure*, JSObject* callback);
static JSFinalizationRegistry* createWithInitialValues(VM&, Structure*);
static Structure* createStructure(VM&, JSGlobalObject*, JSValue prototype);
void runFinalizationCleanup(JSGlobalObject*);
DECLARE_EXPORT_INFO;
void finalizeUnconditionally(VM&);
static void visitChildren(JSCell*, SlotVisitor&);
static void destroy(JSCell*);
static constexpr bool needsDestruction = true;
JSValue takeDeadHoldingsValue();
bool unregister(VM&, JSObject* token);
void registerTarget(VM&, JSObject* target, JSValue holdings, JSValue token);
JS_EXPORT_PRIVATE size_t liveCount(const Locker<JSCellLock>&);
JS_EXPORT_PRIVATE size_t deadCount(const Locker<JSCellLock>&);
private:
JSFinalizationRegistry(VM& vm, Structure* structure)
: Base(vm, structure)
{
}
JS_EXPORT_PRIVATE void finishCreation(VM&, JSGlobalObject*, JSObject* callback);
static String toStringName(const JSObject*, JSGlobalObject*);
struct Registration {
JSObject* target;
WriteBarrier<Unknown> holdings;
};
using LiveRegistrations = Vector<Registration>;
using DeadRegistrations = Vector<WriteBarrier<Unknown>>;
HashMap<JSObject*, LiveRegistrations> m_liveRegistrations;
HashMap<JSObject*, DeadRegistrations> m_deadRegistrations;
LiveRegistrations m_noUnregistrationLive;
DeadRegistrations m_noUnregistrationDead;
};
}