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node_object_wrap.h
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111 lines (86 loc) · 2.66 KB
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#ifndef SRC_NODE_OBJECT_WRAP_H_
#define SRC_NODE_OBJECT_WRAP_H_
#include "v8.h"
#include <assert.h>
namespace node {
class ObjectWrap {
public:
ObjectWrap() {
refs_ = 0;
}
virtual ~ObjectWrap() {
if (persistent().IsEmpty())
return;
assert(persistent().IsNearDeath());
persistent().ClearWeak();
persistent().Reset();
}
template <class T>
static inline T* Unwrap(v8::Local<v8::Object> handle) {
assert(!handle.IsEmpty());
assert(handle->InternalFieldCount() > 0);
// Cast to ObjectWrap before casting to T. A direct cast from void
// to T won't work right when T has more than one base class.
void* ptr = handle->GetAlignedPointerFromInternalField(0);
ObjectWrap* wrap = static_cast<ObjectWrap*>(ptr);
return static_cast<T*>(wrap);
}
inline v8::Local<v8::Object> handle() {
return handle(v8::Isolate::GetCurrent());
}
inline v8::Local<v8::Object> handle(v8::Isolate* isolate) {
return v8::Local<v8::Object>::New(isolate, persistent());
}
inline v8::Persistent<v8::Object>& persistent() {
return handle_;
}
protected:
inline void Wrap(v8::Local<v8::Object> handle) {
assert(persistent().IsEmpty());
assert(handle->InternalFieldCount() > 0);
handle->SetAlignedPointerInInternalField(0, this);
persistent().Reset(v8::Isolate::GetCurrent(), handle);
MakeWeak();
}
inline void MakeWeak(void) {
persistent().SetWeak(this, WeakCallback, v8::WeakCallbackType::kParameter);
persistent().MarkIndependent();
}
/* Ref() marks the object as being attached to an event loop.
* Refed objects will not be garbage collected, even if
* all references are lost.
*/
virtual void Ref() {
assert(!persistent().IsEmpty());
persistent().ClearWeak();
refs_++;
}
/* Unref() marks an object as detached from the event loop. This is its
* default state. When an object with a "weak" reference changes from
* attached to detached state it will be freed. Be careful not to access
* the object after making this call as it might be gone!
* (A "weak reference" means an object that only has a
* persistent handle.)
*
* DO NOT CALL THIS FROM DESTRUCTOR
*/
virtual void Unref() {
assert(!persistent().IsEmpty());
assert(!persistent().IsWeak());
assert(refs_ > 0);
if (--refs_ == 0)
MakeWeak();
}
int refs_; // ro
private:
static void WeakCallback(
const v8::WeakCallbackInfo<ObjectWrap>& data) {
ObjectWrap* wrap = data.GetParameter();
assert(wrap->refs_ == 0);
wrap->handle_.Reset();
delete wrap;
}
v8::Persistent<v8::Object> handle_;
};
} // namespace node
#endif // SRC_NODE_OBJECT_WRAP_H_