Head

GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	js_native_api_v8.h	Lines:	96	99	97.0 %
Date:	2022-05-20 04:15:46	Branches:	25	32	78.1 %


#ifndef SRC_JS_NATIVE_API_V8_H_
#define SRC_JS_NATIVE_API_V8_H_

// This file needs to be compatible with C compilers.
#include <string.h>  // NOLINT(modernize-deprecated-headers)
#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);
  }
  virtual ~napi_env__() {
    // 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);
  }
  v8::Isolate* const isolate;  // Shortcut for context()->GetIsolate()
  v8impl::Persistent<v8::Context> context_persistent;

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

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

  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();
    }
  }

  virtual void CallFinalizer(napi_finalize cb, void* data, void* hint) {
    v8::HandleScope handle_scope(isolate);
    CallIntoModule([&](napi_env env) { cb(env, data, hint); });
  }

  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;
};

// 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;
};

static 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;
}

static 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))

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

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

#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			// This file needs to be compatible with C compilers.
5			#include <string.h> // NOLINT(modernize-deprecated-headers)
6			#include "js_native_api_types.h"
7			#include "js_native_api_v8_internals.h"
8
9			static napi_status napi_clear_last_error(napi_env env);
10
11			namespace v8impl {
12
13			class RefTracker {
14			public:
15		3263	RefTracker() {}
16		6498	virtual ~RefTracker() {}
17			virtual void Finalize(bool isEnvTeardown) {}
18
19			typedef RefTracker RefList;
20
21		3081	inline void Link(RefList* list) {
22		3081	prev_ = list;
23		3081	next_ = list->next_;
24	✓✓	3081	if (next_ != nullptr) {
25		2459	next_->prev_ = this;
26			}
27		3081	list->next_ = this;
28		3081	}
29
30		3071	inline void Unlink() {
31	✓✗	3071	if (prev_ != nullptr) {
32		3071	prev_->next_ = next_;
33			}
34	✓✓	3071	if (next_ != nullptr) {
35		2449	next_->prev_ = prev_;
36			}
37		3071	prev_ = nullptr;
38		3071	next_ = nullptr;
39		3071	}
40
41		695	static void FinalizeAll(RefList* list) {
42	✓✓	695	while (list->next_ != nullptr) {
43		517	list->next_->Finalize(true);
44			}
45		178	}
46
47			private:
48			RefList* next_ = nullptr;
49			RefList* prev_ = nullptr;
50			};
51
52			} // end of namespace v8impl
53
54			struct napi_env__ {
55		91	explicit napi_env__(v8::Local<v8::Context> context)
56		273	: isolate(context->GetIsolate()), context_persistent(isolate, context) {
57	✗✓	91	CHECK_EQ(isolate, context->GetIsolate());
58		91	napi_clear_last_error(this);
59		91	}
60		356	virtual ~napi_env__() {
61			// First we must finalize those references that have `napi_finalizer`
62			// callbacks. The reason is that addons might store other references which
63			// they delete during their `napi_finalizer` callbacks. If we deleted such
64			// references here first, they would be doubly deleted when the
65			// `napi_finalizer` deleted them subsequently.
66		178	v8impl::RefTracker::FinalizeAll(&finalizing_reflist);
67		178	v8impl::RefTracker::FinalizeAll(&reflist);
68			}
69			v8::Isolate* const isolate; // Shortcut for context()->GetIsolate()
70			v8impl::Persistent<v8::Context> context_persistent;
71
72		243741	inline v8::Local<v8::Context> context() const {
73		243741	return v8impl::PersistentToLocal::Strong(context_persistent);
74			}
75
76		1050	inline void Ref() { refs++; }
77		1139	inline void Unref() {
78	✓✓✓✗	1139	if (--refs == 0) delete this;
79		1139	}
80
81		2	virtual bool can_call_into_js() const { return true; }
82			virtual v8::Maybe<bool> mark_arraybuffer_as_untransferable(
83			v8::Local<v8::ArrayBuffer> ab) const {
84			return v8::Just(true);
85			}
86
87		4	static inline void HandleThrow(napi_env env, v8::Local<v8::Value> value) {
88		4	env->isolate->ThrowException(value);
89		4	}
90
91			template <typename T, typename U = decltype(HandleThrow)>
92		238982	inline void CallIntoModule(T&& call, U&& handle_exception = HandleThrow) {
93		238982	int open_handle_scopes_before = open_handle_scopes;
94		238982	int open_callback_scopes_before = open_callback_scopes;
95		238982	napi_clear_last_error(this);
96		238982	call(this);
97	✗✓	238982	CHECK_EQ(open_handle_scopes, open_handle_scopes_before);
98	✗✓	238982	CHECK_EQ(open_callback_scopes, open_callback_scopes_before);
99	✓✓	238982	if (!last_exception.IsEmpty()) {
100	✗✓	2488	handle_exception(this, last_exception.Get(this->isolate));
101		1242	last_exception.Reset();
102			}
103		238980	}
104
105		503	virtual void CallFinalizer(napi_finalize cb, void* data, void* hint) {
106		503	v8::HandleScope handle_scope(isolate);
107		1006	CallIntoModule([&](napi_env env) { cb(env, data, hint); });
108		503	}
109
110			v8impl::Persistent<v8::Value> last_exception;
111
112			// We store references in two different lists, depending on whether they have
113			// `napi_finalizer` callbacks, because we must first finalize the ones that
114			// have such a callback. See `~napi_env__()` above for details.
115			v8impl::RefTracker::RefList reflist;
116			v8impl::RefTracker::RefList finalizing_reflist;
117			napi_extended_error_info last_error;
118			int open_handle_scopes = 0;
119			int open_callback_scopes = 0;
120			int refs = 1;
121			void* instance_data = nullptr;
122			};
123
124			// This class is used to keep a napi_env live in a way that
125			// is exception safe versus calling Ref/Unref directly
126			class EnvRefHolder {
127			public:
128		1013	explicit EnvRefHolder(napi_env env) : _env(env) { _env->Ref(); }
129
130			explicit EnvRefHolder(const EnvRefHolder& other) : _env(other.env()) {
131			_env->Ref();
132			}
133
134		2026	EnvRefHolder(EnvRefHolder&& other) {
135		2026	_env = other._env;
136		2026	other._env = nullptr;
137		2026	}
138
139		6078	~EnvRefHolder() {
140	✓✓	3039	if (_env != nullptr) {
141		1013	_env->Unref();
142			}
143		3039	}
144
145		1013	napi_env env(void) const { return _env; }
146
147			private:
148			napi_env _env;
149			};
150
151		604524	static inline napi_status napi_clear_last_error(napi_env env) {
152		604524	env->last_error.error_code = napi_ok;
153
154			// TODO(boingoing): Should this be a callback?
155		604524	env->last_error.engine_error_code = 0;
156		604524	env->last_error.engine_reserved = nullptr;
157		604524	env->last_error.error_message = nullptr;
158		604524	return napi_ok;
159			}
160
161		1353	static inline napi_status napi_set_last_error(napi_env env,
162			napi_status error_code,
163			uint32_t engine_error_code = 0,
164			void* engine_reserved = nullptr) {
165		1353	env->last_error.error_code = error_code;
166		1353	env->last_error.engine_error_code = engine_error_code;
167		1353	env->last_error.engine_reserved = engine_reserved;
168		1353	return error_code;
169			}
170
171			#define RETURN_STATUS_IF_FALSE(env, condition, status) \
172			do { \
173			if (!(condition)) { \
174			return napi_set_last_error((env), (status)); \
175			} \
176			} while (0)
177
178			#define RETURN_STATUS_IF_FALSE_WITH_PREAMBLE(env, condition, status) \
179			do { \
180			if (!(condition)) { \
181			return napi_set_last_error( \
182			(env), try_catch.HasCaught() ? napi_pending_exception : (status)); \
183			} \
184			} while (0)
185
186			#define CHECK_ENV(env) \
187			do { \
188			if ((env) == nullptr) { \
189			return napi_invalid_arg; \
190			} \
191			} while (0)
192
193			#define CHECK_ARG(env, arg) \
194			RETURN_STATUS_IF_FALSE((env), ((arg) != nullptr), napi_invalid_arg)
195
196			#define CHECK_ARG_WITH_PREAMBLE(env, arg) \
197			RETURN_STATUS_IF_FALSE_WITH_PREAMBLE( \
198			(env), ((arg) != nullptr), napi_invalid_arg)
199
200			#define CHECK_MAYBE_EMPTY(env, maybe, status) \
201			RETURN_STATUS_IF_FALSE((env), !((maybe).IsEmpty()), (status))
202
203			#define CHECK_MAYBE_EMPTY_WITH_PREAMBLE(env, maybe, status) \
204			RETURN_STATUS_IF_FALSE_WITH_PREAMBLE((env), !((maybe).IsEmpty()), (status))
205
206			// NAPI_PREAMBLE is not wrapped in do..while: try_catch must have function scope
207			#define NAPI_PREAMBLE(env) \
208			CHECK_ENV((env)); \
209			RETURN_STATUS_IF_FALSE( \
210			(env), \
211			(env)->last_exception.IsEmpty() && (env)->can_call_into_js(), \
212			napi_pending_exception); \
213			napi_clear_last_error((env)); \
214			v8impl::TryCatch try_catch((env))
215
216			#define CHECK_TO_TYPE(env, type, context, result, src, status) \
217			do { \
218			CHECK_ARG((env), (src)); \
219			auto maybe = v8impl::V8LocalValueFromJsValue((src))->To##type((context)); \
220			CHECK_MAYBE_EMPTY((env), maybe, (status)); \
221			(result) = maybe.ToLocalChecked(); \
222			} while (0)
223
224			#define CHECK_TO_TYPE_WITH_PREAMBLE(env, type, context, result, src, status) \
225			do { \
226			CHECK_ARG_WITH_PREAMBLE((env), (src)); \
227			auto maybe = v8impl::V8LocalValueFromJsValue((src))->To##type((context)); \
228			CHECK_MAYBE_EMPTY_WITH_PREAMBLE((env), maybe, (status)); \
229			(result) = maybe.ToLocalChecked(); \
230			} while (0)
231
232			#define CHECK_TO_FUNCTION(env, result, src) \
233			do { \
234			CHECK_ARG((env), (src)); \
235			v8::Local<v8::Value> v8value = v8impl::V8LocalValueFromJsValue((src)); \
236			RETURN_STATUS_IF_FALSE((env), v8value->IsFunction(), napi_invalid_arg); \
237			(result) = v8value.As<v8::Function>(); \
238			} while (0)
239
240			#define CHECK_TO_OBJECT(env, context, result, src) \
241			CHECK_TO_TYPE((env), Object, (context), (result), (src), napi_object_expected)
242
243			#define CHECK_TO_OBJECT_WITH_PREAMBLE(env, context, result, src) \
244			CHECK_TO_TYPE_WITH_PREAMBLE( \
245			(env), Object, (context), (result), (src), napi_object_expected)
246
247			#define CHECK_TO_STRING(env, context, result, src) \
248			CHECK_TO_TYPE((env), String, (context), (result), (src), napi_string_expected)
249
250			#define GET_RETURN_STATUS(env) \
251			(!try_catch.HasCaught() \
252			? napi_ok \
253			: napi_set_last_error((env), napi_pending_exception))
254
255			#define THROW_RANGE_ERROR_IF_FALSE(env, condition, error, message) \
256			do { \
257			if (!(condition)) { \
258			napi_throw_range_error((env), (error), (message)); \
259			return napi_set_last_error((env), napi_generic_failure); \
260			} \
261			} while (0)
262
263			#define RETURN_STATUS_IF_FALSE_WITH_PREAMBLE(env, condition, status) \
264			do { \
265			if (!(condition)) { \
266			return napi_set_last_error( \
267			(env), try_catch.HasCaught() ? napi_pending_exception : (status)); \
268			} \
269			} while (0)
270
271			#define CHECK_MAYBE_EMPTY_WITH_PREAMBLE(env, maybe, status) \
272			RETURN_STATUS_IF_FALSE_WITH_PREAMBLE((env), !((maybe).IsEmpty()), (status))
273
274			namespace v8impl {
275
276			//=== Conversion between V8 Handles and napi_value ========================
277
278			// This asserts v8::Local<> will always be implemented with a single
279			// pointer field so that we can pass it around as a void*.
280			static_assert(sizeof(v8::Local<v8::Value>) == sizeof(napi_value),
281			"Cannot convert between v8::Local<v8::Value> and napi_value");
282
283		351736	inline napi_value JsValueFromV8LocalValue(v8::Local<v8::Value> local) {
284		351736	return reinterpret_cast<napi_value>(*local);
285			}
286
287		243774	inline v8::Local<v8::Value> V8LocalValueFromJsValue(napi_value v) {
288			v8::Local<v8::Value> local;
289		243774	memcpy(static_cast<void*>(&local), &v, sizeof(v));
290		243774	return local;
291			}
292
293			// Adapter for napi_finalize callbacks.
294			class Finalizer {
295			public:
296			// Some Finalizers are run during shutdown when the napi_env is destroyed,
297			// and some need to keep an explicit reference to the napi_env because they
298			// are run independently.
299			enum EnvReferenceMode { kNoEnvReference, kKeepEnvReference };
300
301			protected:
302		3094	Finalizer(napi_env env,
303			napi_finalize finalize_callback,
304			void* finalize_data,
305			void* finalize_hint,
306			EnvReferenceMode refmode = kNoEnvReference)
307		3094	: _env(env),
308			_finalize_callback(finalize_callback),
309			_finalize_data(finalize_data),
310			_finalize_hint(finalize_hint),
311		3094	_has_env_reference(refmode == kKeepEnvReference) {
312	✓✓	3094	if (_has_env_reference) _env->Ref();
313		3094	}
314
315		6168	~Finalizer() {
316	✓✓	3084	if (_has_env_reference) _env->Unref();
317		3084	}
318
319			public:
320		13	static Finalizer* New(napi_env env,
321			napi_finalize finalize_callback = nullptr,
322			void* finalize_data = nullptr,
323			void* finalize_hint = nullptr,
324			EnvReferenceMode refmode = kNoEnvReference) {
325			return new Finalizer(
326		13	env, finalize_callback, finalize_data, finalize_hint, refmode);
327			}
328
329	✓✗	13	static void Delete(Finalizer* finalizer) { delete finalizer; }
330
331			protected:
332			napi_env _env;
333			napi_finalize _finalize_callback;
334			void* _finalize_data;
335			void* _finalize_hint;
336			bool _finalize_ran = false;
337			bool _has_env_reference = false;
338			};
339
340			class TryCatch : public v8::TryCatch {
341			public:
342		119768	explicit TryCatch(napi_env env) : v8::TryCatch(env->isolate), _env(env) {}
343
344		119768	~TryCatch() {
345	✓✓	119768	if (HasCaught()) {
346		2480	_env->last_exception.Reset(_env->isolate, Exception());
347			}
348		119768	}
349
350			private:
351			napi_env _env;
352			};
353
354			// Wrapper around v8impl::Persistent that implements reference counting.
355			class RefBase : protected Finalizer, RefTracker {
356			protected:
357			RefBase(napi_env env,
358			uint32_t initial_refcount,
359			bool delete_self,
360			napi_finalize finalize_callback,
361			void* finalize_data,
362			void* finalize_hint);
363
364			public:
365			static RefBase* New(napi_env env,
366			uint32_t initial_refcount,
367			bool delete_self,
368			napi_finalize finalize_callback,
369			void* finalize_data,
370			void* finalize_hint);
371
372			static inline void Delete(RefBase* reference);
373
374			virtual ~RefBase();
375			void* Data();
376			uint32_t Ref();
377			uint32_t Unref();
378			uint32_t RefCount();
379
380			protected:
381			void Finalize(bool is_env_teardown = false) override;
382
383			private:
384			uint32_t _refcount;
385			bool _delete_self;
386			};
387
388			class Reference : public RefBase {
389			using SecondPassCallParameterRef = Reference*;
390
391			protected:
392			template <typename... Args>
393			Reference(napi_env env, v8::Local<v8::Value> value, Args&&... args);
394
395			public:
396			static Reference* New(napi_env env,
397			v8::Local<v8::Value> value,
398			uint32_t initial_refcount,
399			bool delete_self,
400			napi_finalize finalize_callback = nullptr,
401			void* finalize_data = nullptr,
402			void* finalize_hint = nullptr);
403
404			virtual ~Reference();
405			uint32_t Ref();
406			uint32_t Unref();
407			v8::Local<v8::Value> Get();
408
409			protected:
410			void Finalize(bool is_env_teardown = false) override;
411
412			private:
413			void ClearWeak();
414			void SetWeak();
415
416			static void FinalizeCallback(
417			const v8::WeakCallbackInfo<SecondPassCallParameterRef>& data);
418			static void SecondPassCallback(
419			const v8::WeakCallbackInfo<SecondPassCallParameterRef>& data);
420
421			v8impl::Persistent<v8::Value> _persistent;
422			SecondPassCallParameterRef* _secondPassParameter;
423			bool _secondPassScheduled;
424
425			FRIEND_TEST(JsNativeApiV8Test, Reference);
426			};
427
428			} // end of namespace v8impl
429
430			#define STATUS_CALL(call) \
431			do { \
432			napi_status status = (call); \
433			if (status != napi_ok) return status; \
434			} while (0)
435
436			#endif // SRC_JS_NATIVE_API_V8_H_