blob: 1f033d3d168d8f8a86919d242e9a6b330c2231ba (
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
|
// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_RENDERER_EXTENSIONS_SCOPED_PERSISTENT_H_
#define CHROME_RENDERER_EXTENSIONS_SCOPED_PERSISTENT_H_
#include "base/logging.h"
#include "v8/include/v8.h"
namespace extensions {
// A v8::Persistent handle to a V8 value which destroys and clears the
// underlying handle on destruction.
template <typename T>
class ScopedPersistent {
public:
ScopedPersistent() {
}
explicit ScopedPersistent(v8::Handle<T> handle) {
reset(handle);
}
~ScopedPersistent() {
reset();
}
void reset(v8::Handle<T> handle) {
reset();
handle_ = v8::Persistent<T>::New(GetIsolate(handle), handle);
}
void reset() {
if (handle_.IsEmpty())
return;
handle_.Dispose(GetIsolate(handle_));
handle_.Clear();
}
v8::Persistent<T> operator->() const {
return handle_;
}
v8::Persistent<T> get() const {
return handle_;
}
void MakeWeak(void* parameters, v8::NearDeathCallback callback) {
handle_.MakeWeak(GetIsolate(handle_), parameters, callback);
}
private:
template <typename U>
static v8::Isolate* GetIsolate(v8::Handle<U> object_handle) {
// Only works for v8::Object and its subclasses. Add specialisations for
// anything else.
return GetIsolate(object_handle->CreationContext());
}
static v8::Isolate* GetIsolate(v8::Handle<v8::Context> context_handle) {
return context_handle->GetIsolate();
}
static v8::Isolate* GetIsolate(
v8::Handle<v8::ObjectTemplate> template_handle) {
return v8::Isolate::GetCurrent();
}
v8::Persistent<T> handle_;
DISALLOW_COPY_AND_ASSIGN(ScopedPersistent);
};
} // namespace extensions
#endif // CHROME_RENDERER_EXTENSIONS_SCOPED_PERSISTENT_H_
|
