blob: d00e1484b7c10c068be33959a5733982ce802d94 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
|
#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::Handle<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::Handle<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);
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
* persistant 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::WeakCallbackData<v8::Object, ObjectWrap>& data) {
v8::Isolate* isolate = data.GetIsolate();
v8::HandleScope scope(isolate);
ObjectWrap* wrap = data.GetParameter();
assert(wrap->refs_ == 0);
assert(wrap->handle_.IsNearDeath());
assert(
data.GetValue() == v8::Local<v8::Object>::New(isolate, wrap->handle_));
wrap->handle_.Reset();
delete wrap;
}
v8::Persistent<v8::Object> handle_;
};
} // namespace node
#endif // SRC_NODE_OBJECT_WRAP_H_
|
