Head

GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	api/callback.cc	Lines:	139	155	89.7 %
Date:	2022-05-20 04:15:46	Branches:	80	96	83.3 %


#include "node.h"
#include "async_wrap-inl.h"
#include "env-inl.h"
#include "v8.h"

namespace node {

using v8::Context;
using v8::EscapableHandleScope;
using v8::Function;
using v8::HandleScope;
using v8::Isolate;
using v8::Local;
using v8::MaybeLocal;
using v8::Object;
using v8::String;
using v8::Value;

CallbackScope::CallbackScope(Isolate* isolate,
                             Local<Object> object,
                             async_context async_context)
  : CallbackScope(Environment::GetCurrent(isolate), object, async_context) {}

CallbackScope::CallbackScope(Environment* env,
                             Local<Object> object,
                             async_context asyncContext)
  : private_(new InternalCallbackScope(env,
                                       object,
                                       asyncContext)),
    try_catch_(env->isolate()) {
  try_catch_.SetVerbose(true);
}

CallbackScope::~CallbackScope() {
  if (try_catch_.HasCaught())
    private_->MarkAsFailed();
  delete private_;
}

InternalCallbackScope::InternalCallbackScope(AsyncWrap* async_wrap, int flags)
    : InternalCallbackScope(async_wrap->env(),
                            async_wrap->object(),
                            { async_wrap->get_async_id(),
                              async_wrap->get_trigger_async_id() },
                            flags) {}

InternalCallbackScope::InternalCallbackScope(Environment* env,
                                             Local<Object> object,
                                             const async_context& asyncContext,
                                             int flags)
  : env_(env),
    async_context_(asyncContext),
    object_(object),
    skip_hooks_(flags & kSkipAsyncHooks),
    skip_task_queues_(flags & kSkipTaskQueues) {
  CHECK_NOT_NULL(env);
  env->PushAsyncCallbackScope();

  if (!env->can_call_into_js()) {
    failed_ = true;
    return;
  }

  Isolate* isolate = env->isolate();

  HandleScope handle_scope(isolate);
  Local<Context> current_context = isolate->GetCurrentContext();
  // If you hit this assertion, the caller forgot to enter the right Node.js
  // Environment's v8::Context first.
  // We first check `env->context() != current_context` because the contexts
  // likely *are* the same, in which case we can skip the slightly more
  // expensive Environment::GetCurrent() call.
  if (UNLIKELY(env->context() != current_context)) {
    CHECK_EQ(Environment::GetCurrent(isolate), env);
  }

  isolate->SetIdle(false);

  env->async_hooks()->push_async_context(
    async_context_.async_id, async_context_.trigger_async_id, object);

  pushed_ids_ = true;

  if (asyncContext.async_id != 0 && !skip_hooks_) {
    // No need to check a return value because the application will exit if
    // an exception occurs.
    AsyncWrap::EmitBefore(env, asyncContext.async_id);
  }
}

InternalCallbackScope::~InternalCallbackScope() {
  Close();
  env_->PopAsyncCallbackScope();
}

void InternalCallbackScope::Close() {
  if (closed_) return;
  closed_ = true;

  Isolate* isolate = env_->isolate();
  auto idle = OnScopeLeave([&]() { isolate->SetIdle(true); });

  if (!env_->can_call_into_js()) return;
  auto perform_stopping_check = [&]() {
    if (env_->is_stopping()) {
      MarkAsFailed();
      env_->async_hooks()->clear_async_id_stack();
    }
  };
  perform_stopping_check();

  if (!failed_ && async_context_.async_id != 0 && !skip_hooks_) {
    AsyncWrap::EmitAfter(env_, async_context_.async_id);
  }

  if (pushed_ids_)
    env_->async_hooks()->pop_async_context(async_context_.async_id);

  if (failed_) return;

  if (env_->async_callback_scope_depth() > 1 || skip_task_queues_) {
    return;
  }

  TickInfo* tick_info = env_->tick_info();

  if (!env_->can_call_into_js()) return;

  auto weakref_cleanup = OnScopeLeave([&]() { env_->RunWeakRefCleanup(); });

  Local<Context> context = env_->context();
  if (!tick_info->has_tick_scheduled()) {
    context->GetMicrotaskQueue()->PerformCheckpoint(isolate);

    perform_stopping_check();
  }

  // Make sure the stack unwound properly. If there are nested MakeCallback's
  // then it should return early and not reach this code.
  if (env_->async_hooks()->fields()[AsyncHooks::kTotals]) {
    CHECK_EQ(env_->execution_async_id(), 0);
    CHECK_EQ(env_->trigger_async_id(), 0);
  }

  if (!tick_info->has_tick_scheduled() && !tick_info->has_rejection_to_warn()) {
    return;
  }

  HandleScope handle_scope(isolate);
  Local<Object> process = env_->process_object();

  if (!env_->can_call_into_js()) return;

  Local<Function> tick_callback = env_->tick_callback_function();

  // The tick is triggered before JS land calls SetTickCallback
  // to initializes the tick callback during bootstrap.
  CHECK(!tick_callback.IsEmpty());

  if (tick_callback->Call(context, process, 0, nullptr).IsEmpty()) {
    failed_ = true;
  }
  perform_stopping_check();
}

MaybeLocal<Value> InternalMakeCallback(Environment* env,
                                       Local<Object> resource,
                                       Local<Object> recv,
                                       const Local<Function> callback,
                                       int argc,
                                       Local<Value> argv[],
                                       async_context asyncContext) {
  CHECK(!recv.IsEmpty());
#ifdef DEBUG
  for (int i = 0; i < argc; i++)
    CHECK(!argv[i].IsEmpty());
#endif

  Local<Function> hook_cb = env->async_hooks_callback_trampoline();
  int flags = InternalCallbackScope::kNoFlags;
  bool use_async_hooks_trampoline = false;
  AsyncHooks* async_hooks = env->async_hooks();
  if (!hook_cb.IsEmpty()) {
    // Use the callback trampoline if there are any before or after hooks, or
    // we can expect some kind of usage of async_hooks.executionAsyncResource().
    flags = InternalCallbackScope::kSkipAsyncHooks;
    use_async_hooks_trampoline =
        async_hooks->fields()[AsyncHooks::kBefore] +
        async_hooks->fields()[AsyncHooks::kAfter] +
        async_hooks->fields()[AsyncHooks::kUsesExecutionAsyncResource] > 0;
  }

  InternalCallbackScope scope(env, resource, asyncContext, flags);
  if (scope.Failed()) {
    return MaybeLocal<Value>();
  }

  MaybeLocal<Value> ret;

  Local<Context> context = env->context();
  if (use_async_hooks_trampoline) {
    MaybeStackBuffer<Local<Value>, 16> args(3 + argc);
    args[0] = v8::Number::New(env->isolate(), asyncContext.async_id);
    args[1] = resource;
    args[2] = callback;
    for (int i = 0; i < argc; i++) {
      args[i + 3] = argv[i];
    }
    ret = hook_cb->Call(context, recv, args.length(), &args[0]);
  } else {
    ret = callback->Call(context, recv, argc, argv);
  }

  if (ret.IsEmpty()) {
    scope.MarkAsFailed();
    return MaybeLocal<Value>();
  }

  scope.Close();
  if (scope.Failed()) {
    return MaybeLocal<Value>();
  }

  return ret;
}

// Public MakeCallback()s

MaybeLocal<Value> MakeCallback(Isolate* isolate,
                               Local<Object> recv,
                               const char* method,
                               int argc,
                               Local<Value> argv[],
                               async_context asyncContext) {
  Local<String> method_string =
      String::NewFromUtf8(isolate, method).ToLocalChecked();
  return MakeCallback(isolate, recv, method_string, argc, argv, asyncContext);
}

MaybeLocal<Value> MakeCallback(Isolate* isolate,
                               Local<Object> recv,
                               Local<String> symbol,
                               int argc,
                               Local<Value> argv[],
                               async_context asyncContext) {
  // Check can_call_into_js() first because calling Get() might do so.
  Environment* env =
      Environment::GetCurrent(recv->GetCreationContext().ToLocalChecked());
  CHECK_NOT_NULL(env);
  if (!env->can_call_into_js()) return Local<Value>();

  Local<Value> callback_v;
  if (!recv->Get(isolate->GetCurrentContext(), symbol).ToLocal(&callback_v))
    return Local<Value>();
  if (!callback_v->IsFunction()) {
    // This used to return an empty value, but Undefined() makes more sense
    // since no exception is pending here.
    return Undefined(isolate);
  }
  Local<Function> callback = callback_v.As<Function>();
  return MakeCallback(isolate, recv, callback, argc, argv, asyncContext);
}

MaybeLocal<Value> MakeCallback(Isolate* isolate,
                               Local<Object> recv,
                               Local<Function> callback,
                               int argc,
                               Local<Value> argv[],
                               async_context asyncContext) {
  // Observe the following two subtleties:
  //
  // 1. The environment is retrieved from the callback function's context.
  // 2. The context to enter is retrieved from the environment.
  //
  // Because of the AssignToContext() call in src/node_contextify.cc,
  // the two contexts need not be the same.
  Environment* env =
      Environment::GetCurrent(callback->GetCreationContext().ToLocalChecked());
  CHECK_NOT_NULL(env);
  Context::Scope context_scope(env->context());
  MaybeLocal<Value> ret =
      InternalMakeCallback(env, recv, recv, callback, argc, argv, asyncContext);
  if (ret.IsEmpty() && env->async_callback_scope_depth() == 0) {
    // This is only for legacy compatibility and we may want to look into
    // removing/adjusting it.
    return Undefined(isolate);
  }
  return ret;
}

// Use this if you just want to safely invoke some JS callback and
// would like to retain the currently active async_context, if any.
// In case none is available, a fixed default context will be
// installed otherwise.
MaybeLocal<Value> MakeSyncCallback(Isolate* isolate,
                                   Local<Object> recv,
                                   Local<Function> callback,
                                   int argc,
                                   Local<Value> argv[]) {
  Environment* env =
      Environment::GetCurrent(callback->GetCreationContext().ToLocalChecked());
  CHECK_NOT_NULL(env);
  if (!env->can_call_into_js()) return Local<Value>();

  Local<Context> context = env->context();
  Context::Scope context_scope(context);
  if (env->async_callback_scope_depth()) {
    // There's another MakeCallback() on the stack, piggy back on it.
    // In particular, retain the current async_context.
    return callback->Call(context, recv, argc, argv);
  }

  // This is a toplevel invocation and the caller (intentionally)
  // didn't provide any async_context to run in. Install a default context.
  MaybeLocal<Value> ret =
    InternalMakeCallback(env, env->process_object(), recv, callback, argc, argv,
                         async_context{0, 0});
  return ret;
}

// Legacy MakeCallback()s

Local<Value> MakeCallback(Isolate* isolate,
                          Local<Object> recv,
                          const char* method,
                          int argc,
                          Local<Value>* argv) {
  EscapableHandleScope handle_scope(isolate);
  return handle_scope.Escape(
      MakeCallback(isolate, recv, method, argc, argv, {0, 0})
          .FromMaybe(Local<Value>()));
}

Local<Value> MakeCallback(Isolate* isolate,
                          Local<Object> recv,
                          Local<String> symbol,
                          int argc,
                          Local<Value>* argv) {
  EscapableHandleScope handle_scope(isolate);
  return handle_scope.Escape(
      MakeCallback(isolate, recv, symbol, argc, argv, {0, 0})
          .FromMaybe(Local<Value>()));
}

Local<Value> MakeCallback(Isolate* isolate,
                          Local<Object> recv,
                          Local<Function> callback,
                          int argc,
                          Local<Value>* argv) {
  EscapableHandleScope handle_scope(isolate);
  return handle_scope.Escape(
      MakeCallback(isolate, recv, callback, argc, argv, {0, 0})
          .FromMaybe(Local<Value>()));
}

}  // namespace node


Generated by: GCOVR (Version 4.2)

Line	Branch	Exec	Source
1			#include "node.h"
2			#include "async_wrap-inl.h"
3			#include "env-inl.h"
4			#include "v8.h"
5
6			namespace node {
7
8			using v8::Context;
9			using v8::EscapableHandleScope;
10			using v8::Function;
11			using v8::HandleScope;
12			using v8::Isolate;
13			using v8::Local;
14			using v8::MaybeLocal;
15			using v8::Object;
16			using v8::String;
17			using v8::Value;
18
19		4	CallbackScope::CallbackScope(Isolate* isolate,
20			Local<Object> object,
21		4	async_context async_context)
22		4	: CallbackScope(Environment::GetCurrent(isolate), object, async_context) {}
23
24		115545	CallbackScope::CallbackScope(Environment* env,
25			Local<Object> object,
26		115545	async_context asyncContext)
27			: private_(new InternalCallbackScope(env,
28			object,
29		115545	asyncContext)),
30		231090	try_catch_(env->isolate()) {
31		115545	try_catch_.SetVerbose(true);
32		115545	}
33
34		115544	CallbackScope::~CallbackScope() {
35	✓✓	115544	if (try_catch_.HasCaught())
36		1	private_->MarkAsFailed();
37	✓✗	115544	delete private_;
38		115544	}
39
40		42350	InternalCallbackScope::InternalCallbackScope(AsyncWrap* async_wrap, int flags)
41			: InternalCallbackScope(async_wrap->env(),
42			async_wrap->object(),
43		42350	{ async_wrap->get_async_id(),
44		42350	async_wrap->get_trigger_async_id() },
45		42350	flags) {}
46
47		797590	InternalCallbackScope::InternalCallbackScope(Environment* env,
48			Local<Object> object,
49			const async_context& asyncContext,
50		797590	int flags)
51			: env_(env),
52			async_context_(asyncContext),
53			object_(object),
54		797590	skip_hooks_(flags & kSkipAsyncHooks),
55		1595180	skip_task_queues_(flags & kSkipTaskQueues) {
56	✗✓	797590	CHECK_NOT_NULL(env);
57		797590	env->PushAsyncCallbackScope();
58
59	✓✓	797590	if (!env->can_call_into_js()) {
60		14260	failed_ = true;
61		14260	return;
62			}
63
64		783330	Isolate* isolate = env->isolate();
65
66		1566660	HandleScope handle_scope(isolate);
67		783330	Local<Context> current_context = isolate->GetCurrentContext();
68			// If you hit this assertion, the caller forgot to enter the right Node.js
69			// Environment's v8::Context first.
70			// We first check `env->context() != current_context` because the contexts
71			// likely are the same, in which case we can skip the slightly more
72			// expensive Environment::GetCurrent() call.
73	✓✓	1566660	if (UNLIKELY(env->context() != current_context)) {
74	✗✓	6	CHECK_EQ(Environment::GetCurrent(isolate), env);
75			}
76
77		783330	isolate->SetIdle(false);
78
79		783330	env->async_hooks()->push_async_context(
80			async_context_.async_id, async_context_.trigger_async_id, object);
81
82		783330	pushed_ids_ = true;
83
84	✓✓✓✓	783330	if (asyncContext.async_id != 0 && !skip_hooks_) {
85			// No need to check a return value because the application will exit if
86			// an exception occurs.
87		493405	AsyncWrap::EmitBefore(env, asyncContext.async_id);
88			}
89			}
90
91		1594203	InternalCallbackScope::~InternalCallbackScope() {
92		797145	Close();
93		797058	env_->PopAsyncCallbackScope();
94		797058	}
95
96		1214379	void InternalCallbackScope::Close() {
97	✓✓	1817064	if (closed_) return;
98		797263	closed_ = true;
99
100		797263	Isolate* isolate = env_->isolate();
101		1594321	auto idle = OnScopeLeave([&]() { isolate->SetIdle(true); });
102
103	✓✓	797263	if (!env_->can_call_into_js()) return;
104		1489376	auto perform_stopping_check = [&]() {
105	✓✓	1489376	if (env_->is_stopping()) {
106		292	MarkAsFailed();
107		292	env_->async_hooks()->clear_async_id_stack();
108			}
109		2272311	};
110		782935	perform_stopping_check();
111
112	✓✓✓✓ ✓✓	782935	if (!failed_ && async_context_.async_id != 0 && !skip_hooks_) {
113		493306	AsyncWrap::EmitAfter(env_, async_context_.async_id);
114			}
115
116	✓✗	782935	if (pushed_ids_)
117		782935	env_->async_hooks()->pop_async_context(async_context_.async_id);
118
119	✓✓	782934	if (failed_) return;
120
121	✓✓✓✓ ✓✓	781943	if (env_->async_callback_scope_depth() > 1 \|\| skip_task_queues_) {
122		76581	return;
123			}
124
125		705362	TickInfo* tick_info = env_->tick_info();
126
127	✗✓	705362	if (!env_->can_call_into_js()) return;
128
129		1410520	auto weakref_cleanup = OnScopeLeave([&]() { env_->RunWeakRefCleanup(); });
130
131		705362	Local<Context> context = env_->context();
132	✓✓	705362	if (!tick_info->has_tick_scheduled()) {
133		512118	context->GetMicrotaskQueue()->PerformCheckpoint(isolate);
134
135		512068	perform_stopping_check();
136			}
137
138			// Make sure the stack unwound properly. If there are nested MakeCallback's
139			// then it should return early and not reach this code.
140	✓✓	705312	if (env_->async_hooks()->fields()[AsyncHooks::kTotals]) {
141	✗✓	67882	CHECK_EQ(env_->execution_async_id(), 0);
142	✗✓	67882	CHECK_EQ(env_->trigger_async_id(), 0);
143			}
144
145	✓✓✓✓ ✓✓	705312	if (!tick_info->has_tick_scheduled() && !tick_info->has_rejection_to_warn()) {
146		510784	return;
147			}
148
149		194528	HandleScope handle_scope(isolate);
150		194528	Local<Object> process = env_->process_object();
151
152	✓✓	194528	if (!env_->can_call_into_js()) return;
153
154		194527	Local<Function> tick_callback = env_->tick_callback_function();
155
156			// The tick is triggered before JS land calls SetTickCallback
157			// to initializes the tick callback during bootstrap.
158	✗✓	194527	CHECK(!tick_callback.IsEmpty());
159
160	✓✓	388900	if (tick_callback->Call(context, process, 0, nullptr).IsEmpty()) {
161		439	failed_ = true;
162			}
163		194373	perform_stopping_check();
164			}
165
166		420474	MaybeLocal<Value> InternalMakeCallback(Environment* env,
167			Local<Object> resource,
168			Local<Object> recv,
169			const Local<Function> callback,
170			int argc,
171			Local<Value> argv[],
172			async_context asyncContext) {
173	✗✓	420474	CHECK(!recv.IsEmpty());
174			#ifdef DEBUG
175			for (int i = 0; i < argc; i++)
176			CHECK(!argv[i].IsEmpty());
177			#endif
178
179		420474	Local<Function> hook_cb = env->async_hooks_callback_trampoline();
180		420474	int flags = InternalCallbackScope::kNoFlags;
181		420474	bool use_async_hooks_trampoline = false;
182		420474	AsyncHooks* async_hooks = env->async_hooks();
183	✓✓	420474	if (!hook_cb.IsEmpty()) {
184			// Use the callback trampoline if there are any before or after hooks, or
185			// we can expect some kind of usage of async_hooks.executionAsyncResource().
186		51154	flags = InternalCallbackScope::kSkipAsyncHooks;
187		51154	use_async_hooks_trampoline =
188		51154	async_hooks->fields()[AsyncHooks::kBefore] +
189		51154	async_hooks->fields()[AsyncHooks::kAfter] +
190		51154	async_hooks->fields()[AsyncHooks::kUsesExecutionAsyncResource] > 0;
191			}
192
193		840771	InternalCallbackScope scope(env, resource, asyncContext, flags);
194	✓✓	420474	if (scope.Failed()) {
195		2163	return MaybeLocal<Value>();
196			}
197
198			MaybeLocal<Value> ret;
199
200		418311	Local<Context> context = env->context();
201	✓✓	418311	if (use_async_hooks_trampoline) {
202		30753	MaybeStackBuffer<Local<Value>, 16> args(3 + argc);
203		61506	args[0] = v8::Number::New(env->isolate(), asyncContext.async_id);
204		30753	args[1] = resource;
205		30753	args[2] = callback;
206	✓✓	42036	for (int i = 0; i < argc; i++) {
207		11283	args[i + 3] = argv[i];
208			}
209		30753	ret = hook_cb->Call(context, recv, args.length(), &args[0]);
210			} else {
211		387558	ret = callback->Call(context, recv, argc, argv);
212			}
213
214	✓✓	418252	if (ret.IsEmpty()) {
215		1018	scope.MarkAsFailed();
216		1018	return MaybeLocal<Value>();
217			}
218
219		417234	scope.Close();
220	✓✓	417116	if (scope.Failed()) {
221		348	return MaybeLocal<Value>();
222			}
223
224		416768	return ret;
225			}
226
227			// Public MakeCallback()s
228
229		10104	MaybeLocal<Value> MakeCallback(Isolate* isolate,
230			Local<Object> recv,
231			const char* method,
232			int argc,
233			Local<Value> argv[],
234			async_context asyncContext) {
235			Local<String> method_string =
236		10104	String::NewFromUtf8(isolate, method).ToLocalChecked();
237		10104	return MakeCallback(isolate, recv, method_string, argc, argv, asyncContext);
238			}
239
240		10113	MaybeLocal<Value> MakeCallback(Isolate* isolate,
241			Local<Object> recv,
242			Local<String> symbol,
243			int argc,
244			Local<Value> argv[],
245			async_context asyncContext) {
246			// Check can_call_into_js() first because calling Get() might do so.
247			Environment* env =
248		20226	Environment::GetCurrent(recv->GetCreationContext().ToLocalChecked());
249	✗✓	10113	CHECK_NOT_NULL(env);
250	✓✓	10120	if (!env->can_call_into_js()) return Local<Value>();
251
252			Local<Value> callback_v;
253	✗✓	20212	if (!recv->Get(isolate->GetCurrentContext(), symbol).ToLocal(&callback_v))
254			return Local<Value>();
255	✗✓	10106	if (!callback_v->IsFunction()) {
256			// This used to return an empty value, but Undefined() makes more sense
257			// since no exception is pending here.
258			return Undefined(isolate);
259			}
260		10106	Local<Function> callback = callback_v.As<Function>();
261		10106	return MakeCallback(isolate, recv, callback, argc, argv, asyncContext);
262			}
263
264		54350	MaybeLocal<Value> MakeCallback(Isolate* isolate,
265			Local<Object> recv,
266			Local<Function> callback,
267			int argc,
268			Local<Value> argv[],
269			async_context asyncContext) {
270			// Observe the following two subtleties:
271			//
272			// 1. The environment is retrieved from the callback function's context.
273			// 2. The context to enter is retrieved from the environment.
274			//
275			// Because of the AssignToContext() call in src/node_contextify.cc,
276			// the two contexts need not be the same.
277			Environment* env =
278		108700	Environment::GetCurrent(callback->GetCreationContext().ToLocalChecked());
279	✗✓	54350	CHECK_NOT_NULL(env);
280		54350	Context::Scope context_scope(env->context());
281			MaybeLocal<Value> ret =
282		54350	InternalMakeCallback(env, recv, recv, callback, argc, argv, asyncContext);
283	✓✓✓✓ ✓✓	54335	if (ret.IsEmpty() && env->async_callback_scope_depth() == 0) {
284			// This is only for legacy compatibility and we may want to look into
285			// removing/adjusting it.
286		1215	return Undefined(isolate);
287			}
288		53120	return ret;
289			}
290
291			// Use this if you just want to safely invoke some JS callback and
292			// would like to retain the currently active async_context, if any.
293			// In case none is available, a fixed default context will be
294			// installed otherwise.
295		16	MaybeLocal<Value> MakeSyncCallback(Isolate* isolate,
296			Local<Object> recv,
297			Local<Function> callback,
298			int argc,
299			Local<Value> argv[]) {
300			Environment* env =
301		32	Environment::GetCurrent(callback->GetCreationContext().ToLocalChecked());
302	✗✓	16	CHECK_NOT_NULL(env);
303	✗✓	16	if (!env->can_call_into_js()) return Local<Value>();
304
305		16	Local<Context> context = env->context();
306		16	Context::Scope context_scope(context);
307	✓✗	16	if (env->async_callback_scope_depth()) {
308			// There's another MakeCallback() on the stack, piggy back on it.
309			// In particular, retain the current async_context.
310		16	return callback->Call(context, recv, argc, argv);
311			}
312
313			// This is a toplevel invocation and the caller (intentionally)
314			// didn't provide any async_context to run in. Install a default context.
315			MaybeLocal<Value> ret =
316			InternalMakeCallback(env, env->process_object(), recv, callback, argc, argv,
317			async_context{0, 0});
318			return ret;
319			}
320
321			// Legacy MakeCallback()s
322
323			Local<Value> MakeCallback(Isolate* isolate,
324			Local<Object> recv,
325			const char* method,
326			int argc,
327			Local<Value>* argv) {
328			EscapableHandleScope handle_scope(isolate);
329			return handle_scope.Escape(
330			MakeCallback(isolate, recv, method, argc, argv, {0, 0})
331			.FromMaybe(Local<Value>()));
332			}
333
334			Local<Value> MakeCallback(Isolate* isolate,
335			Local<Object> recv,
336			Local<String> symbol,
337			int argc,
338			Local<Value>* argv) {
339			EscapableHandleScope handle_scope(isolate);
340			return handle_scope.Escape(
341			MakeCallback(isolate, recv, symbol, argc, argv, {0, 0})
342			.FromMaybe(Local<Value>()));
343			}
344
345			Local<Value> MakeCallback(Isolate* isolate,
346			Local<Object> recv,
347			Local<Function> callback,
348			int argc,
349			Local<Value>* argv) {
350			EscapableHandleScope handle_scope(isolate);
351			return handle_scope.Escape(
352			MakeCallback(isolate, recv, callback, argc, argv, {0, 0})
353			.FromMaybe(Local<Value>()));
354			}
355
356			} // namespace node