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GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	js_native_api_v8.h	Lines:	94	101	93.1 %
Date:	2022-09-11 04:22:34	Branches:	25	32	78.1 %


#ifndef SRC_JS_NATIVE_API_V8_H_
#define SRC_JS_NATIVE_API_V8_H_

#include "js_native_api_types.h"
#include "js_native_api_v8_internals.h"

static napi_status napi_clear_last_error(napi_env env);

namespace v8impl {

class RefTracker {
 public:
  RefTracker() {}
  virtual ~RefTracker() {}
  virtual void Finalize(bool isEnvTeardown) {}

  typedef RefTracker RefList;

  inline void Link(RefList* list) {
    prev_ = list;
    next_ = list->next_;
    if (next_ != nullptr) {
      next_->prev_ = this;
    }
    list->next_ = this;
  }

  inline void Unlink() {
    if (prev_ != nullptr) {
      prev_->next_ = next_;
    }
    if (next_ != nullptr) {
      next_->prev_ = prev_;
    }
    prev_ = nullptr;
    next_ = nullptr;
  }

  static void FinalizeAll(RefList* list) {
    while (list->next_ != nullptr) {
      list->next_->Finalize(true);
    }
  }

 private:
  RefList* next_ = nullptr;
  RefList* prev_ = nullptr;
};

}  // end of namespace v8impl

struct napi_env__ {
  explicit napi_env__(v8::Local<v8::Context> context)
      : isolate(context->GetIsolate()), context_persistent(isolate, context) {
    CHECK_EQ(isolate, context->GetIsolate());
    napi_clear_last_error(this);
  }

  inline v8::Local<v8::Context> context() const {
    return v8impl::PersistentToLocal::Strong(context_persistent);
  }

  inline void Ref() { refs++; }
  inline void Unref() {
    if (--refs == 0) DeleteMe();
  }

  virtual bool can_call_into_js() const { return true; }
  virtual v8::Maybe<bool> mark_arraybuffer_as_untransferable(
      v8::Local<v8::ArrayBuffer> ab) const {
    return v8::Just(true);
  }

  static inline void HandleThrow(napi_env env, v8::Local<v8::Value> value) {
    env->isolate->ThrowException(value);
  }

  template <typename T, typename U = decltype(HandleThrow)>
  inline void CallIntoModule(T&& call, U&& handle_exception = HandleThrow) {
    int open_handle_scopes_before = open_handle_scopes;
    int open_callback_scopes_before = open_callback_scopes;
    napi_clear_last_error(this);
    call(this);
    CHECK_EQ(open_handle_scopes, open_handle_scopes_before);
    CHECK_EQ(open_callback_scopes, open_callback_scopes_before);
    if (!last_exception.IsEmpty()) {
      handle_exception(this, last_exception.Get(this->isolate));
      last_exception.Reset();
    }
  }

  // This should be overridden to schedule the finalization to a properiate
  // timing, like next tick of the event loop.
  virtual void CallFinalizer(napi_finalize cb, void* data, void* hint) {
    v8::HandleScope handle_scope(isolate);
    CallIntoModule([&](napi_env env) { cb(env, data, hint); });
  }

  virtual void DeleteMe() {
    // First we must finalize those references that have `napi_finalizer`
    // callbacks. The reason is that addons might store other references which
    // they delete during their `napi_finalizer` callbacks. If we deleted such
    // references here first, they would be doubly deleted when the
    // `napi_finalizer` deleted them subsequently.
    v8impl::RefTracker::FinalizeAll(&finalizing_reflist);
    v8impl::RefTracker::FinalizeAll(&reflist);
    delete this;
  }

  v8::Isolate* const isolate;  // Shortcut for context()->GetIsolate()
  v8impl::Persistent<v8::Context> context_persistent;

  v8impl::Persistent<v8::Value> last_exception;

  // We store references in two different lists, depending on whether they have
  // `napi_finalizer` callbacks, because we must first finalize the ones that
  // have such a callback. See `~napi_env__()` above for details.
  v8impl::RefTracker::RefList reflist;
  v8impl::RefTracker::RefList finalizing_reflist;
  napi_extended_error_info last_error;
  int open_handle_scopes = 0;
  int open_callback_scopes = 0;
  int refs = 1;
  void* instance_data = nullptr;

 protected:
  // Should not be deleted directly. Delete with `napi_env__::DeleteMe()`
  // instead.
  virtual ~napi_env__() = default;
};

// This class is used to keep a napi_env live in a way that
// is exception safe versus calling Ref/Unref directly
class EnvRefHolder {
 public:
  explicit EnvRefHolder(napi_env env) : _env(env) { _env->Ref(); }

  explicit EnvRefHolder(const EnvRefHolder& other) : _env(other.env()) {
    _env->Ref();
  }

  EnvRefHolder(EnvRefHolder&& other) {
    _env = other._env;
    other._env = nullptr;
  }

  ~EnvRefHolder() {
    if (_env != nullptr) {
      _env->Unref();
    }
  }

  napi_env env(void) const { return _env; }

 private:
  napi_env _env;
};

inline napi_status napi_clear_last_error(napi_env env) {
  env->last_error.error_code = napi_ok;

  // TODO(boingoing): Should this be a callback?
  env->last_error.engine_error_code = 0;
  env->last_error.engine_reserved = nullptr;
  env->last_error.error_message = nullptr;
  return napi_ok;
}

inline napi_status napi_set_last_error(napi_env env,
                                       napi_status error_code,
                                       uint32_t engine_error_code = 0,
                                       void* engine_reserved = nullptr) {
  env->last_error.error_code = error_code;
  env->last_error.engine_error_code = engine_error_code;
  env->last_error.engine_reserved = engine_reserved;
  return error_code;
}

#define RETURN_STATUS_IF_FALSE(env, condition, status)                         \
  do {                                                                         \
    if (!(condition)) {                                                        \
      return napi_set_last_error((env), (status));                             \
    }                                                                          \
  } while (0)

#define RETURN_STATUS_IF_FALSE_WITH_PREAMBLE(env, condition, status)           \
  do {                                                                         \
    if (!(condition)) {                                                        \
      return napi_set_last_error(                                              \
          (env), try_catch.HasCaught() ? napi_pending_exception : (status));   \
    }                                                                          \
  } while (0)

#define CHECK_ENV(env)                                                         \
  do {                                                                         \
    if ((env) == nullptr) {                                                    \
      return napi_invalid_arg;                                                 \
    }                                                                          \
  } while (0)

#define CHECK_ARG(env, arg)                                                    \
  RETURN_STATUS_IF_FALSE((env), ((arg) != nullptr), napi_invalid_arg)

#define CHECK_ARG_WITH_PREAMBLE(env, arg)                                      \
  RETURN_STATUS_IF_FALSE_WITH_PREAMBLE(                                        \
      (env), ((arg) != nullptr), napi_invalid_arg)

#define CHECK_MAYBE_EMPTY(env, maybe, status)                                  \
  RETURN_STATUS_IF_FALSE((env), !((maybe).IsEmpty()), (status))

#define CHECK_MAYBE_EMPTY_WITH_PREAMBLE(env, maybe, status)                    \
  RETURN_STATUS_IF_FALSE_WITH_PREAMBLE((env), !((maybe).IsEmpty()), (status))

// NAPI_PREAMBLE is not wrapped in do..while: try_catch must have function scope
#define NAPI_PREAMBLE(env)                                                     \
  CHECK_ENV((env));                                                            \
  RETURN_STATUS_IF_FALSE(                                                      \
      (env),                                                                   \
      (env)->last_exception.IsEmpty() && (env)->can_call_into_js(),            \
      napi_pending_exception);                                                 \
  napi_clear_last_error((env));                                                \
  v8impl::TryCatch try_catch((env))

#define CHECK_TO_TYPE(env, type, context, result, src, status)                 \
  do {                                                                         \
    CHECK_ARG((env), (src));                                                   \
    auto maybe = v8impl::V8LocalValueFromJsValue((src))->To##type((context));  \
    CHECK_MAYBE_EMPTY((env), maybe, (status));                                 \
    (result) = maybe.ToLocalChecked();                                         \
  } while (0)

#define CHECK_TO_TYPE_WITH_PREAMBLE(env, type, context, result, src, status)   \
  do {                                                                         \
    CHECK_ARG_WITH_PREAMBLE((env), (src));                                     \
    auto maybe = v8impl::V8LocalValueFromJsValue((src))->To##type((context));  \
    CHECK_MAYBE_EMPTY_WITH_PREAMBLE((env), maybe, (status));                   \
    (result) = maybe.ToLocalChecked();                                         \
  } while (0)

#define CHECK_TO_FUNCTION(env, result, src)                                    \
  do {                                                                         \
    CHECK_ARG((env), (src));                                                   \
    v8::Local<v8::Value> v8value = v8impl::V8LocalValueFromJsValue((src));     \
    RETURN_STATUS_IF_FALSE((env), v8value->IsFunction(), napi_invalid_arg);    \
    (result) = v8value.As<v8::Function>();                                     \
  } while (0)

#define CHECK_TO_OBJECT(env, context, result, src)                             \
  CHECK_TO_TYPE((env), Object, (context), (result), (src), napi_object_expected)

#define CHECK_TO_OBJECT_WITH_PREAMBLE(env, context, result, src)               \
  CHECK_TO_TYPE_WITH_PREAMBLE(                                                 \
      (env), Object, (context), (result), (src), napi_object_expected)

#define CHECK_TO_STRING(env, context, result, src)                             \
  CHECK_TO_TYPE((env), String, (context), (result), (src), napi_string_expected)

#define GET_RETURN_STATUS(env)                                                 \
  (!try_catch.HasCaught()                                                      \
       ? napi_ok                                                               \
       : napi_set_last_error((env), napi_pending_exception))

#define THROW_RANGE_ERROR_IF_FALSE(env, condition, error, message)             \
  do {                                                                         \
    if (!(condition)) {                                                        \
      napi_throw_range_error((env), (error), (message));                       \
      return napi_set_last_error((env), napi_generic_failure);                 \
    }                                                                          \
  } while (0)

#define RETURN_STATUS_IF_FALSE_WITH_PREAMBLE(env, condition, status)           \
  do {                                                                         \
    if (!(condition)) {                                                        \
      return napi_set_last_error(                                              \
          (env), try_catch.HasCaught() ? napi_pending_exception : (status));   \
    }                                                                          \
  } while (0)

#define CHECK_MAYBE_EMPTY_WITH_PREAMBLE(env, maybe, status)                    \
  RETURN_STATUS_IF_FALSE_WITH_PREAMBLE((env), !((maybe).IsEmpty()), (status))

#define STATUS_CALL(call)                                                      \
  do {                                                                         \
    napi_status status = (call);                                               \
    if (status != napi_ok) return status;                                      \
  } while (0)

namespace v8impl {

//=== Conversion between V8 Handles and napi_value ========================

// This asserts v8::Local<> will always be implemented with a single
// pointer field so that we can pass it around as a void*.
static_assert(sizeof(v8::Local<v8::Value>) == sizeof(napi_value),
              "Cannot convert between v8::Local<v8::Value> and napi_value");

inline napi_value JsValueFromV8LocalValue(v8::Local<v8::Value> local) {
  return reinterpret_cast<napi_value>(*local);
}

inline v8::Local<v8::Value> V8LocalValueFromJsValue(napi_value v) {
  v8::Local<v8::Value> local;
  memcpy(static_cast<void*>(&local), &v, sizeof(v));
  return local;
}

// Adapter for napi_finalize callbacks.
class Finalizer {
 public:
  // Some Finalizers are run during shutdown when the napi_env is destroyed,
  // and some need to keep an explicit reference to the napi_env because they
  // are run independently.
  enum EnvReferenceMode { kNoEnvReference, kKeepEnvReference };

 protected:
  Finalizer(napi_env env,
            napi_finalize finalize_callback,
            void* finalize_data,
            void* finalize_hint,
            EnvReferenceMode refmode = kNoEnvReference)
      : _env(env),
        _finalize_callback(finalize_callback),
        _finalize_data(finalize_data),
        _finalize_hint(finalize_hint),
        _has_env_reference(refmode == kKeepEnvReference) {
    if (_has_env_reference) _env->Ref();
  }

  ~Finalizer() {
    if (_has_env_reference) _env->Unref();
  }

 public:
  static Finalizer* New(napi_env env,
                        napi_finalize finalize_callback = nullptr,
                        void* finalize_data = nullptr,
                        void* finalize_hint = nullptr,
                        EnvReferenceMode refmode = kNoEnvReference) {
    return new Finalizer(
        env, finalize_callback, finalize_data, finalize_hint, refmode);
  }

  static void Delete(Finalizer* finalizer) { delete finalizer; }

 protected:
  napi_env _env;
  napi_finalize _finalize_callback;
  void* _finalize_data;
  void* _finalize_hint;
  bool _finalize_ran = false;
  bool _has_env_reference = false;
};

class TryCatch : public v8::TryCatch {
 public:
  explicit TryCatch(napi_env env) : v8::TryCatch(env->isolate), _env(env) {}

  ~TryCatch() {
    if (HasCaught()) {
      _env->last_exception.Reset(_env->isolate, Exception());
    }
  }

 private:
  napi_env _env;
};

// Wrapper around v8impl::Persistent that implements reference counting.
class RefBase : protected Finalizer, RefTracker {
 protected:
  RefBase(napi_env env,
          uint32_t initial_refcount,
          bool delete_self,
          napi_finalize finalize_callback,
          void* finalize_data,
          void* finalize_hint);

 public:
  static RefBase* New(napi_env env,
                      uint32_t initial_refcount,
                      bool delete_self,
                      napi_finalize finalize_callback,
                      void* finalize_data,
                      void* finalize_hint);

  static inline void Delete(RefBase* reference);

  virtual ~RefBase();
  void* Data();
  uint32_t Ref();
  uint32_t Unref();
  uint32_t RefCount();

 protected:
  void Finalize(bool is_env_teardown = false) override;

 private:
  uint32_t _refcount;
  bool _delete_self;
};

class Reference : public RefBase {
  using SecondPassCallParameterRef = Reference*;

 protected:
  template <typename... Args>
  Reference(napi_env env, v8::Local<v8::Value> value, Args&&... args);

 public:
  static Reference* New(napi_env env,
                        v8::Local<v8::Value> value,
                        uint32_t initial_refcount,
                        bool delete_self,
                        napi_finalize finalize_callback = nullptr,
                        void* finalize_data = nullptr,
                        void* finalize_hint = nullptr);

  virtual ~Reference();
  uint32_t Ref();
  uint32_t Unref();
  v8::Local<v8::Value> Get();

 protected:
  void Finalize(bool is_env_teardown = false) override;

 private:
  void ClearWeak();
  void SetWeak();

  static void FinalizeCallback(
      const v8::WeakCallbackInfo<SecondPassCallParameterRef>& data);
  static void SecondPassCallback(
      const v8::WeakCallbackInfo<SecondPassCallParameterRef>& data);

  v8impl::Persistent<v8::Value> _persistent;
  SecondPassCallParameterRef* _secondPassParameter;
  bool _secondPassScheduled;

  FRIEND_TEST(JsNativeApiV8Test, Reference);
};

}  // end of namespace v8impl

#endif  // SRC_JS_NATIVE_API_V8_H_


Generated by: GCOVR (Version 4.2)

Line	Branch	Exec	Source
1			#ifndef SRC_JS_NATIVE_API_V8_H_
2			#define SRC_JS_NATIVE_API_V8_H_
3
4			#include "js_native_api_types.h"
5			#include "js_native_api_v8_internals.h"
6
7			static napi_status napi_clear_last_error(napi_env env);
8
9			namespace v8impl {
10
11			class RefTracker {
12			public:
13		3325	RefTracker() {}
14		6622	virtual ~RefTracker() {}
15			virtual void Finalize(bool isEnvTeardown) {}
16
17			typedef RefTracker RefList;
18
19		3133	inline void Link(RefList* list) {
20		3133	prev_ = list;
21		3133	next_ = list->next_;
22	✓✓	3133	if (next_ != nullptr) {
23		2501	next_->prev_ = this;
24			}
25		3133	list->next_ = this;
26		3133	}
27
28		3123	inline void Unlink() {
29	✓✗	3123	if (prev_ != nullptr) {
30		3123	prev_->next_ = next_;
31			}
32	✓✓	3123	if (next_ != nullptr) {
33		2491	next_->prev_ = prev_;
34			}
35		3123	prev_ = nullptr;
36		3123	next_ = nullptr;
37		3123	}
38
39		757	static void FinalizeAll(RefList* list) {
40	✓✓	757	while (list->next_ != nullptr) {
41		569	list->next_->Finalize(true);
42			}
43		188	}
44
45			private:
46			RefList* next_ = nullptr;
47			RefList* prev_ = nullptr;
48			};
49
50			} // end of namespace v8impl
51
52			struct napi_env__ {
53		96	explicit napi_env__(v8::Local<v8::Context> context)
54		288	: isolate(context->GetIsolate()), context_persistent(isolate, context) {
55	✗✓	96	CHECK_EQ(isolate, context->GetIsolate());
56		96	napi_clear_last_error(this);
57		96	}
58
59		244400	inline v8::Local<v8::Context> context() const {
60		244400	return v8impl::PersistentToLocal::Strong(context_persistent);
61			}
62
63		1070	inline void Ref() { refs++; }
64		1163	inline void Unref() {
65	✓✓	1163	if (--refs == 0) DeleteMe();
66		1163	}
67
68			virtual bool can_call_into_js() const { return true; }
69			virtual v8::Maybe<bool> mark_arraybuffer_as_untransferable(
70			v8::Local<v8::ArrayBuffer> ab) const {
71			return v8::Just(true);
72			}
73
74		2	static inline void HandleThrow(napi_env env, v8::Local<v8::Value> value) {
75		2	env->isolate->ThrowException(value);
76		2	}
77
78			template <typename T, typename U = decltype(HandleThrow)>
79		239097	inline void CallIntoModule(T&& call, U&& handle_exception = HandleThrow) {
80		239097	int open_handle_scopes_before = open_handle_scopes;
81		239097	int open_callback_scopes_before = open_callback_scopes;
82		239097	napi_clear_last_error(this);
83		239097	call(this);
84	✗✓	239097	CHECK_EQ(open_handle_scopes, open_handle_scopes_before);
85	✗✓	239097	CHECK_EQ(open_callback_scopes, open_callback_scopes_before);
86	✓✓	239097	if (!last_exception.IsEmpty()) {
87	✗✓	2508	handle_exception(this, last_exception.Get(this->isolate));
88		1250	last_exception.Reset();
89			}
90		239093	}
91
92			// This should be overridden to schedule the finalization to a properiate
93			// timing, like next tick of the event loop.
94			virtual void CallFinalizer(napi_finalize cb, void* data, void* hint) {
95			v8::HandleScope handle_scope(isolate);
96			CallIntoModule([&](napi_env env) { cb(env, data, hint); });
97			}
98
99		94	virtual void DeleteMe() {
100			// First we must finalize those references that have `napi_finalizer`
101			// callbacks. The reason is that addons might store other references which
102			// they delete during their `napi_finalizer` callbacks. If we deleted such
103			// references here first, they would be doubly deleted when the
104			// `napi_finalizer` deleted them subsequently.
105		94	v8impl::RefTracker::FinalizeAll(&finalizing_reflist);
106		94	v8impl::RefTracker::FinalizeAll(&reflist);
107	✓✗	94	delete this;
108		94	}
109
110			v8::Isolate* const isolate; // Shortcut for context()->GetIsolate()
111			v8impl::Persistent<v8::Context> context_persistent;
112
113			v8impl::Persistent<v8::Value> last_exception;
114
115			// We store references in two different lists, depending on whether they have
116			// `napi_finalizer` callbacks, because we must first finalize the ones that
117			// have such a callback. See `~napi_env__()` above for details.
118			v8impl::RefTracker::RefList reflist;
119			v8impl::RefTracker::RefList finalizing_reflist;
120			napi_extended_error_info last_error;
121			int open_handle_scopes = 0;
122			int open_callback_scopes = 0;
123			int refs = 1;
124			void* instance_data = nullptr;
125
126			protected:
127			// Should not be deleted directly. Delete with `napi_env__::DeleteMe()`
128			// instead.
129		376	virtual ~napi_env__() = default;
130			};
131
132			// This class is used to keep a napi_env live in a way that
133			// is exception safe versus calling Ref/Unref directly
134			class EnvRefHolder {
135			public:
136		1030	explicit EnvRefHolder(napi_env env) : _env(env) { _env->Ref(); }
137
138			explicit EnvRefHolder(const EnvRefHolder& other) : _env(other.env()) {
139			_env->Ref();
140			}
141
142		2060	EnvRefHolder(EnvRefHolder&& other) {
143		2060	_env = other._env;
144		2060	other._env = nullptr;
145		2060	}
146
147		6178	~EnvRefHolder() {
148	✓✓	3089	if (_env != nullptr) {
149		1029	_env->Unref();
150			}
151		3089	}
152
153		1030	napi_env env(void) const { return _env; }
154
155			private:
156			napi_env _env;
157			};
158
159		604700	inline napi_status napi_clear_last_error(napi_env env) {
160		604700	env->last_error.error_code = napi_ok;
161
162			// TODO(boingoing): Should this be a callback?
163		604700	env->last_error.engine_error_code = 0;
164		604700	env->last_error.engine_reserved = nullptr;
165		604700	env->last_error.error_message = nullptr;
166		604700	return napi_ok;
167			}
168
169		1350	inline napi_status napi_set_last_error(napi_env env,
170			napi_status error_code,
171			uint32_t engine_error_code = 0,
172			void* engine_reserved = nullptr) {
173		1350	env->last_error.error_code = error_code;
174		1350	env->last_error.engine_error_code = engine_error_code;
175		1350	env->last_error.engine_reserved = engine_reserved;
176		1350	return error_code;
177			}
178
179			#define RETURN_STATUS_IF_FALSE(env, condition, status) \
180			do { \
181			if (!(condition)) { \
182			return napi_set_last_error((env), (status)); \
183			} \
184			} while (0)
185
186			#define RETURN_STATUS_IF_FALSE_WITH_PREAMBLE(env, condition, status) \
187			do { \
188			if (!(condition)) { \
189			return napi_set_last_error( \
190			(env), try_catch.HasCaught() ? napi_pending_exception : (status)); \
191			} \
192			} while (0)
193
194			#define CHECK_ENV(env) \
195			do { \
196			if ((env) == nullptr) { \
197			return napi_invalid_arg; \
198			} \
199			} while (0)
200
201			#define CHECK_ARG(env, arg) \
202			RETURN_STATUS_IF_FALSE((env), ((arg) != nullptr), napi_invalid_arg)
203
204			#define CHECK_ARG_WITH_PREAMBLE(env, arg) \
205			RETURN_STATUS_IF_FALSE_WITH_PREAMBLE( \
206			(env), ((arg) != nullptr), napi_invalid_arg)
207
208			#define CHECK_MAYBE_EMPTY(env, maybe, status) \
209			RETURN_STATUS_IF_FALSE((env), !((maybe).IsEmpty()), (status))
210
211			#define CHECK_MAYBE_EMPTY_WITH_PREAMBLE(env, maybe, status) \
212			RETURN_STATUS_IF_FALSE_WITH_PREAMBLE((env), !((maybe).IsEmpty()), (status))
213
214			// NAPI_PREAMBLE is not wrapped in do..while: try_catch must have function scope
215			#define NAPI_PREAMBLE(env) \
216			CHECK_ENV((env)); \
217			RETURN_STATUS_IF_FALSE( \
218			(env), \
219			(env)->last_exception.IsEmpty() && (env)->can_call_into_js(), \
220			napi_pending_exception); \
221			napi_clear_last_error((env)); \
222			v8impl::TryCatch try_catch((env))
223
224			#define CHECK_TO_TYPE(env, type, context, result, src, status) \
225			do { \
226			CHECK_ARG((env), (src)); \
227			auto maybe = v8impl::V8LocalValueFromJsValue((src))->To##type((context)); \
228			CHECK_MAYBE_EMPTY((env), maybe, (status)); \
229			(result) = maybe.ToLocalChecked(); \
230			} while (0)
231
232			#define CHECK_TO_TYPE_WITH_PREAMBLE(env, type, context, result, src, status) \
233			do { \
234			CHECK_ARG_WITH_PREAMBLE((env), (src)); \
235			auto maybe = v8impl::V8LocalValueFromJsValue((src))->To##type((context)); \
236			CHECK_MAYBE_EMPTY_WITH_PREAMBLE((env), maybe, (status)); \
237			(result) = maybe.ToLocalChecked(); \
238			} while (0)
239
240			#define CHECK_TO_FUNCTION(env, result, src) \
241			do { \
242			CHECK_ARG((env), (src)); \
243			v8::Local<v8::Value> v8value = v8impl::V8LocalValueFromJsValue((src)); \
244			RETURN_STATUS_IF_FALSE((env), v8value->IsFunction(), napi_invalid_arg); \
245			(result) = v8value.As<v8::Function>(); \
246			} while (0)
247
248			#define CHECK_TO_OBJECT(env, context, result, src) \
249			CHECK_TO_TYPE((env), Object, (context), (result), (src), napi_object_expected)
250
251			#define CHECK_TO_OBJECT_WITH_PREAMBLE(env, context, result, src) \
252			CHECK_TO_TYPE_WITH_PREAMBLE( \
253			(env), Object, (context), (result), (src), napi_object_expected)
254
255			#define CHECK_TO_STRING(env, context, result, src) \
256			CHECK_TO_TYPE((env), String, (context), (result), (src), napi_string_expected)
257
258			#define GET_RETURN_STATUS(env) \
259			(!try_catch.HasCaught() \
260			? napi_ok \
261			: napi_set_last_error((env), napi_pending_exception))
262
263			#define THROW_RANGE_ERROR_IF_FALSE(env, condition, error, message) \
264			do { \
265			if (!(condition)) { \
266			napi_throw_range_error((env), (error), (message)); \
267			return napi_set_last_error((env), napi_generic_failure); \
268			} \
269			} while (0)
270
271			#define RETURN_STATUS_IF_FALSE_WITH_PREAMBLE(env, condition, status) \
272			do { \
273			if (!(condition)) { \
274			return napi_set_last_error( \
275			(env), try_catch.HasCaught() ? napi_pending_exception : (status)); \
276			} \
277			} while (0)
278
279			#define CHECK_MAYBE_EMPTY_WITH_PREAMBLE(env, maybe, status) \
280			RETURN_STATUS_IF_FALSE_WITH_PREAMBLE((env), !((maybe).IsEmpty()), (status))
281
282			#define STATUS_CALL(call) \
283			do { \
284			napi_status status = (call); \
285			if (status != napi_ok) return status; \
286			} while (0)
287
288			namespace v8impl {
289
290			//=== Conversion between V8 Handles and napi_value ========================
291
292			// This asserts v8::Local<> will always be implemented with a single
293			// pointer field so that we can pass it around as a void*.
294			static_assert(sizeof(v8::Local<v8::Value>) == sizeof(napi_value),
295			"Cannot convert between v8::Local<v8::Value> and napi_value");
296
297		351794	inline napi_value JsValueFromV8LocalValue(v8::Local<v8::Value> local) {
298		351794	return reinterpret_cast<napi_value>(*local);
299			}
300
301		243835	inline v8::Local<v8::Value> V8LocalValueFromJsValue(napi_value v) {
302			v8::Local<v8::Value> local;
303		243835	memcpy(static_cast<void*>(&local), &v, sizeof(v));
304		243835	return local;
305			}
306
307			// Adapter for napi_finalize callbacks.
308			class Finalizer {
309			public:
310			// Some Finalizers are run during shutdown when the napi_env is destroyed,
311			// and some need to keep an explicit reference to the napi_env because they
312			// are run independently.
313			enum EnvReferenceMode { kNoEnvReference, kKeepEnvReference };
314
315			protected:
316		3147	Finalizer(napi_env env,
317			napi_finalize finalize_callback,
318			void* finalize_data,
319			void* finalize_hint,
320			EnvReferenceMode refmode = kNoEnvReference)
321		3147	: _env(env),
322			_finalize_callback(finalize_callback),
323			_finalize_data(finalize_data),
324			_finalize_hint(finalize_hint),
325		3147	_has_env_reference(refmode == kKeepEnvReference) {
326	✓✓	3147	if (_has_env_reference) _env->Ref();
327		3147	}
328
329		6274	~Finalizer() {
330	✓✓	3137	if (_has_env_reference) _env->Unref();
331		3137	}
332
333			public:
334		14	static Finalizer* New(napi_env env,
335			napi_finalize finalize_callback = nullptr,
336			void* finalize_data = nullptr,
337			void* finalize_hint = nullptr,
338			EnvReferenceMode refmode = kNoEnvReference) {
339			return new Finalizer(
340		14	env, finalize_callback, finalize_data, finalize_hint, refmode);
341			}
342
343	✓✗	14	static void Delete(Finalizer* finalizer) { delete finalizer; }
344
345			protected:
346			napi_env _env;
347			napi_finalize _finalize_callback;
348			void* _finalize_data;
349			void* _finalize_hint;
350			bool _finalize_ran = false;
351			bool _has_env_reference = false;
352			};
353
354			class TryCatch : public v8::TryCatch {
355			public:
356		119788	explicit TryCatch(napi_env env) : v8::TryCatch(env->isolate), _env(env) {}
357
358		119788	~TryCatch() {
359	✓✓	119788	if (HasCaught()) {
360		2490	_env->last_exception.Reset(_env->isolate, Exception());
361			}
362		119788	}
363
364			private:
365			napi_env _env;
366			};
367
368			// Wrapper around v8impl::Persistent that implements reference counting.
369			class RefBase : protected Finalizer, RefTracker {
370			protected:
371			RefBase(napi_env env,
372			uint32_t initial_refcount,
373			bool delete_self,
374			napi_finalize finalize_callback,
375			void* finalize_data,
376			void* finalize_hint);
377
378			public:
379			static RefBase* New(napi_env env,
380			uint32_t initial_refcount,
381			bool delete_self,
382			napi_finalize finalize_callback,
383			void* finalize_data,
384			void* finalize_hint);
385
386			static inline void Delete(RefBase* reference);
387
388			virtual ~RefBase();
389			void* Data();
390			uint32_t Ref();
391			uint32_t Unref();
392			uint32_t RefCount();
393
394			protected:
395			void Finalize(bool is_env_teardown = false) override;
396
397			private:
398			uint32_t _refcount;
399			bool _delete_self;
400			};
401
402			class Reference : public RefBase {
403			using SecondPassCallParameterRef = Reference*;
404
405			protected:
406			template <typename... Args>
407			Reference(napi_env env, v8::Local<v8::Value> value, Args&&... args);
408
409			public:
410			static Reference* New(napi_env env,
411			v8::Local<v8::Value> value,
412			uint32_t initial_refcount,
413			bool delete_self,
414			napi_finalize finalize_callback = nullptr,
415			void* finalize_data = nullptr,
416			void* finalize_hint = nullptr);
417
418			virtual ~Reference();
419			uint32_t Ref();
420			uint32_t Unref();
421			v8::Local<v8::Value> Get();
422
423			protected:
424			void Finalize(bool is_env_teardown = false) override;
425
426			private:
427			void ClearWeak();
428			void SetWeak();
429
430			static void FinalizeCallback(
431			const v8::WeakCallbackInfo<SecondPassCallParameterRef>& data);
432			static void SecondPassCallback(
433			const v8::WeakCallbackInfo<SecondPassCallParameterRef>& data);
434
435			v8impl::Persistent<v8::Value> _persistent;
436			SecondPassCallParameterRef* _secondPassParameter;
437			bool _secondPassScheduled;
438
439			FRIEND_TEST(JsNativeApiV8Test, Reference);
440			};
441
442			} // end of namespace v8impl
443
444			#endif // SRC_JS_NATIVE_API_V8_H_