GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: base_object-inl.h Lines: 165 172 95.9 %
Date: 2021-09-08 04:14:13 Branches: 65 92 70.7 %

Line Branch Exec Source
1
// Copyright Joyent, Inc. and other Node contributors.
2
//
3
// Permission is hereby granted, free of charge, to any person obtaining a
4
// copy of this software and associated documentation files (the
5
// "Software"), to deal in the Software without restriction, including
6
// without limitation the rights to use, copy, modify, merge, publish,
7
// distribute, sublicense, and/or sell copies of the Software, and to permit
8
// persons to whom the Software is furnished to do so, subject to the
9
// following conditions:
10
//
11
// The above copyright notice and this permission notice shall be included
12
// in all copies or substantial portions of the Software.
13
//
14
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
15
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
16
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
17
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
18
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
19
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
20
// USE OR OTHER DEALINGS IN THE SOFTWARE.
21
22
#ifndef SRC_BASE_OBJECT_INL_H_
23
#define SRC_BASE_OBJECT_INL_H_
24
25
#if defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS
26
27
#include "base_object.h"
28
#include "env-inl.h"
29
#include "util.h"
30
31
#include "v8.h"
32
33
namespace node {
34
35
333999
BaseObject::BaseObject(Environment* env, v8::Local<v8::Object> object)
36
667998
    : persistent_handle_(env->isolate(), object), env_(env) {
37
333999
  CHECK_EQ(false, object.IsEmpty());
38
333999
  CHECK_GT(object->InternalFieldCount(), 0);
39
333999
  object->SetAlignedPointerInInternalField(
40
      BaseObject::kSlot,
41
      static_cast<void*>(this));
42
333999
  env->AddCleanupHook(DeleteMe, static_cast<void*>(this));
43
333999
  env->modify_base_object_count(1);
44
333999
}
45
46

1383594
BaseObject::~BaseObject() {
47
652744
  env()->modify_base_object_count(-1);
48
652744
  env()->RemoveCleanupHook(DeleteMe, static_cast<void*>(this));
49
50
652744
  if (UNLIKELY(has_pointer_data())) {
51
339224
    PointerData* metadata = pointer_data();
52
339224
    CHECK_EQ(metadata->strong_ptr_count, 0);
53
339224
    metadata->self = nullptr;
54
339224
    if (metadata->weak_ptr_count == 0)
55
339184
      delete metadata;
56
  }
57
58
652744
  if (persistent_handle_.IsEmpty()) {
59
    // This most likely happened because the weak callback below cleared it.
60
78106
    return;
61
  }
62
63
  {
64
574638
    v8::HandleScope handle_scope(env()->isolate());
65
1149276
    object()->SetAlignedPointerInInternalField(BaseObject::kSlot, nullptr);
66
  }
67
}
68
69
165733
void BaseObject::Detach() {
70
165733
  CHECK_GT(pointer_data()->strong_ptr_count, 0);
71
165733
  pointer_data()->is_detached = true;
72
165733
}
73
74
451410
v8::Global<v8::Object>& BaseObject::persistent() {
75
451410
  return persistent_handle_;
76
}
77
78
79
2279782
v8::Local<v8::Object> BaseObject::object() const {
80
2279782
  return PersistentToLocal::Default(env()->isolate(), persistent_handle_);
81
}
82
83
105350
v8::Local<v8::Object> BaseObject::object(v8::Isolate* isolate) const {
84
105350
  v8::Local<v8::Object> handle = object();
85
86
  DCHECK_EQ(handle->GetCreationContext().ToLocalChecked()->GetIsolate(),
87
            isolate);
88
  DCHECK_EQ(env()->isolate(), isolate);
89
90
105350
  return handle;
91
}
92
93
10612116
Environment* BaseObject::env() const {
94
10612116
  return env_;
95
}
96
97
5198169
BaseObject* BaseObject::FromJSObject(v8::Local<v8::Value> value) {
98
5198169
  v8::Local<v8::Object> obj = value.As<v8::Object>();
99
  DCHECK_GE(obj->InternalFieldCount(), BaseObject::kSlot);
100
  return static_cast<BaseObject*>(
101
10396338
      obj->GetAlignedPointerFromInternalField(BaseObject::kSlot));
102
}
103
104
105
template <typename T>
106
730705
T* BaseObject::FromJSObject(v8::Local<v8::Value> object) {
107
730705
  return static_cast<T*>(FromJSObject(object));
108
}
109
110
111
149859
void BaseObject::MakeWeak() {
112
149859
  if (has_pointer_data()) {
113
41277
    pointer_data()->wants_weak_jsobj = true;
114
41277
    if (pointer_data()->strong_ptr_count > 0) return;
115
  }
116
117
299716
  persistent_handle_.SetWeak(
118
      this,
119
39052
      [](const v8::WeakCallbackInfo<BaseObject>& data) {
120
39052
        BaseObject* obj = data.GetParameter();
121
        // Clear the persistent handle so that ~BaseObject() doesn't attempt
122
        // to mess with internal fields, since the JS object may have
123
        // transitioned into an invalid state.
124
        // Refs: https://github.com/nodejs/node/issues/18897
125
39052
        obj->persistent_handle_.Reset();
126

39052
        CHECK_IMPLIES(obj->has_pointer_data(),
127
                      obj->pointer_data()->strong_ptr_count == 0);
128
39052
        obj->OnGCCollect();
129
39052
      }, v8::WeakCallbackType::kParameter);
130
}
131
132
203141
void BaseObject::OnGCCollect() {
133
203141
  delete this;
134
203141
}
135
136
3058
void BaseObject::ClearWeak() {
137
3058
  if (has_pointer_data())
138
    pointer_data()->wants_weak_jsobj = false;
139
140
3058
  persistent_handle_.ClearWeak();
141
3058
}
142
143
bool BaseObject::IsWeakOrDetached() const {
144
  if (persistent_handle_.IsWeak()) return true;
145
146
  if (!has_pointer_data()) return false;
147
  const PointerData* pd = const_cast<BaseObject*>(this)->pointer_data();
148
  return pd->wants_weak_jsobj || pd->is_detached;
149
}
150
151
23845
void BaseObject::LazilyInitializedJSTemplateConstructor(
152
    const v8::FunctionCallbackInfo<v8::Value>& args) {
153
  DCHECK(args.IsConstructCall());
154
  DCHECK_GT(args.This()->InternalFieldCount(), 0);
155
23845
  args.This()->SetAlignedPointerInInternalField(BaseObject::kSlot, nullptr);
156
23845
}
157
158
v8::Local<v8::FunctionTemplate>
159
17778
BaseObject::MakeLazilyInitializedJSTemplate(Environment* env) {
160
  v8::Local<v8::FunctionTemplate> t =
161
17778
      env->NewFunctionTemplate(LazilyInitializedJSTemplateConstructor);
162
17778
  t->Inherit(BaseObject::GetConstructorTemplate(env));
163
35556
  t->InstanceTemplate()->SetInternalFieldCount(
164
      BaseObject::kInternalFieldCount);
165
17778
  return t;
166
}
167
168
template <int Field>
169
6
void BaseObject::InternalFieldGet(
170
    v8::Local<v8::String> property,
171
    const v8::PropertyCallbackInfo<v8::Value>& info) {
172
6
  info.GetReturnValue().Set(info.This()->GetInternalField(Field));
173
6
}
174
175
template <int Field, bool (v8::Value::* typecheck)() const>
176
98871
void BaseObject::InternalFieldSet(v8::Local<v8::String> property,
177
                                  v8::Local<v8::Value> value,
178
                                  const v8::PropertyCallbackInfo<void>& info) {
179
  // This could be e.g. value->IsFunction().
180
98871
  CHECK(((*value)->*typecheck)());
181
98871
  info.This()->SetInternalField(Field, value);
182
98871
}
183
184
6826479
bool BaseObject::has_pointer_data() const {
185
6826479
  return pointer_data_ != nullptr;
186
}
187
188
2746158
BaseObject::PointerData* BaseObject::pointer_data() {
189
2746158
  if (!has_pointer_data()) {
190
171144
    PointerData* metadata = new PointerData();
191
171144
    metadata->wants_weak_jsobj = persistent_handle_.IsWeak();
192
171144
    metadata->self = this;
193
171144
    pointer_data_ = metadata;
194
  }
195
2746158
  CHECK(has_pointer_data());
196
2746158
  return pointer_data_;
197
}
198
199
710005
void BaseObject::decrease_refcount() {
200
710005
  CHECK(has_pointer_data());
201
710005
  PointerData* metadata = pointer_data();
202
710005
  CHECK_GT(metadata->strong_ptr_count, 0);
203
710005
  unsigned int new_refcount = --metadata->strong_ptr_count;
204
710005
  if (new_refcount == 0) {
205
237571
    if (metadata->is_detached) {
206
164091
      OnGCCollect();
207

73480
    } else if (metadata->wants_weak_jsobj && !persistent_handle_.IsEmpty()) {
208
41276
      MakeWeak();
209
    }
210
  }
211
710005
}
212
213
711610
void BaseObject::increase_refcount() {
214
711610
  unsigned int prev_refcount = pointer_data()->strong_ptr_count++;
215

711610
  if (prev_refcount == 0 && !persistent_handle_.IsEmpty())
216
239089
    persistent_handle_.ClearWeak();
217
711610
}
218
219
template <typename T, bool kIsWeak>
220
BaseObject::PointerData*
221
3655560
BaseObjectPtrImpl<T, kIsWeak>::pointer_data() const {
222
  if (kIsWeak) {
223
2286272
    return data_.pointer_data;
224
  }
225
1369288
  if (get_base_object() == nullptr) {
226
    return nullptr;
227
  }
228
1369288
  return get_base_object()->pointer_data();
229
}
230
231
template <typename T, bool kIsWeak>
232
16254551
BaseObject* BaseObjectPtrImpl<T, kIsWeak>::get_base_object() const {
233
  if (kIsWeak) {
234
1033544
    if (pointer_data() == nullptr) {
235
8
      return nullptr;
236
    }
237
1033536
    return pointer_data()->self;
238
  }
239
15221007
  return data_.target;
240
}
241
242
template <typename T, bool kIsWeak>
243
3352399
BaseObjectPtrImpl<T, kIsWeak>::~BaseObjectPtrImpl() {
244
3352399
  if (kIsWeak) {
245
48884
    if (pointer_data() != nullptr &&
246

72530
        --pointer_data()->weak_ptr_count == 0 &&
247
23646
        pointer_data()->self == nullptr) {
248
40
      delete pointer_data();
249
    }
250
3303515
  } else if (get() != nullptr) {
251
1238934
    get()->decrease_refcount();
252
  }
253
3352399
}
254
255
template <typename T, bool kIsWeak>
256
2728933
BaseObjectPtrImpl<T, kIsWeak>::BaseObjectPtrImpl() {
257
2728933
  data_.target = nullptr;
258
2728933
}
259
260
template <typename T, bool kIsWeak>
261
2073557
BaseObjectPtrImpl<T, kIsWeak>::BaseObjectPtrImpl(T* target)
262
2073557
  : BaseObjectPtrImpl() {
263
2073557
  if (target == nullptr) return;
264
  if (kIsWeak) {
265
48874
    data_.pointer_data = target->pointer_data();
266
48874
    CHECK_NOT_NULL(pointer_data());
267
48874
    pointer_data()->weak_ptr_count++;
268
  } else {
269
1369288
    data_.target = target;
270
1369288
    CHECK_NOT_NULL(pointer_data());
271
1369288
    get()->increase_refcount();
272
  }
273
}
274
275
template <typename T, bool kIsWeak>
276
template <typename U, bool kW>
277
33423
BaseObjectPtrImpl<T, kIsWeak>::BaseObjectPtrImpl(
278
    const BaseObjectPtrImpl<U, kW>& other)
279
33423
  : BaseObjectPtrImpl(other.get()) {}
280
281
template <typename T, bool kIsWeak>
282
850509
BaseObjectPtrImpl<T, kIsWeak>::BaseObjectPtrImpl(const BaseObjectPtrImpl& other)
283
850509
  : BaseObjectPtrImpl(other.get()) {}
284
285
template <typename T, bool kIsWeak>
286
template <typename U, bool kW>
287
8
BaseObjectPtrImpl<T, kIsWeak>& BaseObjectPtrImpl<T, kIsWeak>::operator=(
288
    const BaseObjectPtrImpl<U, kW>& other) {
289
8
  if (other.get() == get()) return *this;
290
8
  this->~BaseObjectPtrImpl();
291
8
  return *new (this) BaseObjectPtrImpl(other);
292
}
293
294
template <typename T, bool kIsWeak>
295
2
BaseObjectPtrImpl<T, kIsWeak>& BaseObjectPtrImpl<T, kIsWeak>::operator=(
296
    const BaseObjectPtrImpl& other) {
297
2
  if (other.get() == get()) return *this;
298
2
  this->~BaseObjectPtrImpl();
299
2
  return *new (this) BaseObjectPtrImpl(other);
300
}
301
302
template <typename T, bool kIsWeak>
303
870012
BaseObjectPtrImpl<T, kIsWeak>::BaseObjectPtrImpl(BaseObjectPtrImpl&& other)
304
870012
  : data_(other.data_) {
305
870012
  if (kIsWeak)
306
    other.data_.target = nullptr;
307
  else
308
    other.data_.pointer_data = nullptr;
309
870012
}
310
311
template <typename T, bool kIsWeak>
312
417040
BaseObjectPtrImpl<T, kIsWeak>& BaseObjectPtrImpl<T, kIsWeak>::operator=(
313
    BaseObjectPtrImpl&& other) {
314
417040
  if (&other == this) return *this;
315
417040
  this->~BaseObjectPtrImpl();
316
417040
  return *new (this) BaseObjectPtrImpl(std::move(other));
317
}
318
319
template <typename T, bool kIsWeak>
320
257029
void BaseObjectPtrImpl<T, kIsWeak>::reset(T* ptr) {
321
257029
  *this = BaseObjectPtrImpl(ptr);
322
257029
}
323
324
template <typename T, bool kIsWeak>
325
13683135
T* BaseObjectPtrImpl<T, kIsWeak>::get() const {
326
13683135
  return static_cast<T*>(get_base_object());
327
}
328
329
template <typename T, bool kIsWeak>
330
T& BaseObjectPtrImpl<T, kIsWeak>::operator*() const {
331
  return *get();
332
}
333
334
template <typename T, bool kIsWeak>
335
3997211
T* BaseObjectPtrImpl<T, kIsWeak>::operator->() const {
336
3997211
  return get();
337
}
338
339
template <typename T, bool kIsWeak>
340
1269392
BaseObjectPtrImpl<T, kIsWeak>::operator bool() const {
341
1269392
  return get() != nullptr;
342
}
343
344
template <typename T, bool kIsWeak>
345
template <typename U, bool kW>
346
10965
bool BaseObjectPtrImpl<T, kIsWeak>::operator ==(
347
    const BaseObjectPtrImpl<U, kW>& other) const {
348
10965
  return get() == other.get();
349
}
350
351
template <typename T, bool kIsWeak>
352
template <typename U, bool kW>
353
bool BaseObjectPtrImpl<T, kIsWeak>::operator !=(
354
    const BaseObjectPtrImpl<U, kW>& other) const {
355
  return get() != other.get();
356
}
357
358
template <typename T, typename... Args>
359
30085
BaseObjectPtr<T> MakeBaseObject(Args&&... args) {
360
30085
  return BaseObjectPtr<T>(new T(std::forward<Args>(args)...));
361
}
362
363
template <typename T, typename... Args>
364
18088
BaseObjectPtr<T> MakeDetachedBaseObject(Args&&... args) {
365
18088
  BaseObjectPtr<T> target = MakeBaseObject<T>(std::forward<Args>(args)...);
366
18088
  target->Detach();
367
18088
  return target;
368
}
369
370
}  // namespace node
371
372
#endif  // defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS
373
374
#endif  // SRC_BASE_OBJECT_INL_H_