Head

GCC Code Coverage Report

Directory:	../		Exec	Total	Coverage
File:	/home/iojs/build/workspace/node-test-commit-linux-coverage-daily/nodes/benchmark/out/../src/api/callback.cc	Lines:	97	144	67.4 %
Date:	2021-02-19 04:08:54	Branches:	57	102	55.9 %


#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 asyncContext)
  : private_(new InternalCallbackScope(Environment::GetCurrent(isolate),
                                       object,
                                       asyncContext)),
    try_catch_(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;
  }

  HandleScope handle_scope(env->isolate());
  // If you hit this assertion, you forgot to enter the v8::Context first.
  CHECK_EQ(Environment::GetCurrent(env->isolate()), env);

  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;

  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(); });

  if (!tick_info->has_tick_scheduled()) {
    env_->context()->GetMicrotaskQueue()->PerformCheckpoint(env_->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(env_->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(env_->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;

  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(env->context(), recv, args.length(), &args[0]);
  } else {
    ret = callback->Call(env->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->CreationContext());
  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->CreationContext());
  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(env->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->CreationContext());
  CHECK_NOT_NULL(env);
  if (!env->can_call_into_js()) return Local<Value>();

  Context::Scope context_scope(env->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(env->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 3.4)

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			CallbackScope::CallbackScope(Isolate* isolate,
20			Local<Object> object,
21			async_context asyncContext)
22			: private_(new InternalCallbackScope(Environment::GetCurrent(isolate),
23			object,
24			asyncContext)),
25			try_catch_(isolate) {
26			try_catch_.SetVerbose(true);
27			}
28
29			CallbackScope::~CallbackScope() {
30			if (try_catch_.HasCaught())
31			private_->MarkAsFailed();
32			delete private_;
33			}
34
35		971	InternalCallbackScope::InternalCallbackScope(AsyncWrap* async_wrap, int flags)
36			: InternalCallbackScope(async_wrap->env(),
37			async_wrap->object(),
38		971	{ async_wrap->get_async_id(),
39		971	async_wrap->get_trigger_async_id() },
40		1942	flags) {}
41
42		27973	InternalCallbackScope::InternalCallbackScope(Environment* env,
43			Local<Object> object,
44			const async_context& asyncContext,
45		27973	int flags)
46			: env_(env),
47			async_context_(asyncContext),
48			object_(object),
49		27973	skip_hooks_(flags & kSkipAsyncHooks),
50		55946	skip_task_queues_(flags & kSkipTaskQueues) {
51	✗✓	27973	CHECK_NOT_NULL(env);
52		27973	env->PushAsyncCallbackScope();
53
54	✓✓	27973	if (!env->can_call_into_js()) {
55		323	failed_ = true;
56		323	return;
57			}
58
59		55300	HandleScope handle_scope(env->isolate());
60			// If you hit this assertion, you forgot to enter the v8::Context first.
61	✗✓	27650	CHECK_EQ(Environment::GetCurrent(env->isolate()), env);
62
63		27650	env->async_hooks()->push_async_context(
64		27650	async_context_.async_id, async_context_.trigger_async_id, object);
65
66		27650	pushed_ids_ = true;
67
68	✓✓✓✓	27650	if (asyncContext.async_id != 0 && !skip_hooks_) {
69			// No need to check a return value because the application will exit if
70			// an exception occurs.
71		971	AsyncWrap::EmitBefore(env, asyncContext.async_id);
72			}
73			}
74
75		55938	InternalCallbackScope::~InternalCallbackScope() {
76		27969	Close();
77		27969	env_->PopAsyncCallbackScope();
78		27969	}
79
80		47115	void InternalCallbackScope::Close() {
81	✓✓	91686	if (closed_) return;
82		27971	closed_ = true;
83
84	✓✓	27971	if (!env_->can_call_into_js()) return;
85		55346	auto perform_stopping_check = [&]() {
86	✓✓	55348	if (env_->is_stopping()) {
87		2	MarkAsFailed();
88		2	env_->async_hooks()->clear_async_id_stack();
89			}
90		82993	};
91		27647	perform_stopping_check();
92
93	✓✗✓✓ ✓✓	27647	if (!failed_ && async_context_.async_id != 0 && !skip_hooks_) {
94		971	AsyncWrap::EmitAfter(env_, async_context_.async_id);
95			}
96
97	✓✗	27647	if (pushed_ids_)
98		27647	env_->async_hooks()->pop_async_context(async_context_.async_id);
99
100	✗✓	27647	if (failed_) return;
101
102	✓✓✗✓ ✓✓	27647	if (env_->async_callback_scope_depth() > 1 \|\| skip_task_queues_) {
103		212	return;
104			}
105
106		27435	TickInfo* tick_info = env_->tick_info();
107
108	✗✓	27435	if (!env_->can_call_into_js()) return;
109
110		57410	auto weakref_cleanup = OnScopeLeave([&]() { env_->RunWeakRefCleanup(); });
111
112	✓✓	27435	if (!tick_info->has_tick_scheduled()) {
113		50314	env_->context()->GetMicrotaskQueue()->PerformCheckpoint(env_->isolate());
114
115		25157	perform_stopping_check();
116			}
117
118			// Make sure the stack unwound properly. If there are nested MakeCallback's
119			// then it should return early and not reach this code.
120	✗✓	27435	if (env_->async_hooks()->fields()[AsyncHooks::kTotals]) {
121			CHECK_EQ(env_->execution_async_id(), 0);
122			CHECK_EQ(env_->trigger_async_id(), 0);
123			}
124
125	✓✓✓✗ ✓✓	27435	if (!tick_info->has_tick_scheduled() && !tick_info->has_rejection_to_warn()) {
126		24891	return;
127			}
128
129	✓✓	5086	HandleScope handle_scope(env_->isolate());
130		2544	Local<Object> process = env_->process_object();
131
132	✗✓	2544	if (!env_->can_call_into_js()) return;
133
134		2544	Local<Function> tick_callback = env_->tick_callback_function();
135
136			// The tick is triggered before JS land calls SetTickCallback
137			// to initializes the tick callback during bootstrap.
138	✗✓	2544	CHECK(!tick_callback.IsEmpty());
139
140	✓✓	7630	if (tick_callback->Call(env_->context(), process, 0, nullptr).IsEmpty()) {
141		2	failed_ = true;
142			}
143	✓✗	2542	perform_stopping_check();
144			}
145
146		19146	MaybeLocal<Value> InternalMakeCallback(Environment* env,
147			Local<Object> resource,
148			Local<Object> recv,
149			const Local<Function> callback,
150			int argc,
151			Local<Value> argv[],
152			async_context asyncContext) {
153	✗✓	19146	CHECK(!recv.IsEmpty());
154			#ifdef DEBUG
155			for (int i = 0; i < argc; i++)
156			CHECK(!argv[i].IsEmpty());
157			#endif
158
159		19146	Local<Function> hook_cb = env->async_hooks_callback_trampoline();
160		19146	int flags = InternalCallbackScope::kNoFlags;
161		19146	bool use_async_hooks_trampoline = false;
162		19146	AsyncHooks* async_hooks = env->async_hooks();
163	✓✗	19146	if (!hook_cb.IsEmpty()) {
164			// Use the callback trampoline if there are any before or after hooks, or
165			// we can expect some kind of usage of async_hooks.executionAsyncResource().
166		19146	flags = InternalCallbackScope::kSkipAsyncHooks;
167		19146	use_async_hooks_trampoline =
168		38292	async_hooks->fields()[AsyncHooks::kBefore] +
169		57438	async_hooks->fields()[AsyncHooks::kAfter] +
170		38292	async_hooks->fields()[AsyncHooks::kUsesExecutionAsyncResource] > 0;
171			}
172
173		38290	InternalCallbackScope scope(env, resource, asyncContext, flags);
174	✗✓	19146	if (scope.Failed()) {
175			return MaybeLocal<Value>();
176			}
177
178			MaybeLocal<Value> ret;
179
180	✗✓	19146	if (use_async_hooks_trampoline) {
181			MaybeStackBuffer<Local<Value>, 16> args(3 + argc);
182			args[0] = v8::Number::New(env->isolate(), asyncContext.async_id);
183			args[1] = resource;
184			args[2] = callback;
185			for (int i = 0; i < argc; i++) {
186			args[i + 3] = argv[i];
187			}
188			ret = hook_cb->Call(env->context(), recv, args.length(), &args[0]);
189			} else {
190		38292	ret = callback->Call(env->context(), recv, argc, argv);
191			}
192
193	✗✓	19146	if (ret.IsEmpty()) {
194			scope.MarkAsFailed();
195			return MaybeLocal<Value>();
196			}
197
198		19146	scope.Close();
199	✗✓	19144	if (scope.Failed()) {
200			return MaybeLocal<Value>();
201			}
202
203		19144	return ret;
204			}
205
206			// Public MakeCallback()s
207
208		208	MaybeLocal<Value> MakeCallback(Isolate* isolate,
209			Local<Object> recv,
210			const char* method,
211			int argc,
212			Local<Value> argv[],
213			async_context asyncContext) {
214			Local<String> method_string =
215		416	String::NewFromUtf8(isolate, method).ToLocalChecked();
216		208	return MakeCallback(isolate, recv, method_string, argc, argv, asyncContext);
217			}
218
219		208	MaybeLocal<Value> MakeCallback(Isolate* isolate,
220			Local<Object> recv,
221			Local<String> symbol,
222			int argc,
223			Local<Value> argv[],
224			async_context asyncContext) {
225			// Check can_call_into_js() first because calling Get() might do so.
226		208	Environment* env = Environment::GetCurrent(recv->CreationContext());
227	✗✓	208	CHECK_NOT_NULL(env);
228	✗✓	208	if (!env->can_call_into_js()) return Local<Value>();
229
230			Local<Value> callback_v;
231	✗✓	624	if (!recv->Get(isolate->GetCurrentContext(), symbol).ToLocal(&callback_v))
232			return Local<Value>();
233	✗✓	208	if (!callback_v->IsFunction()) {
234			// This used to return an empty value, but Undefined() makes more sense
235			// since no exception is pending here.
236			return Undefined(isolate);
237			}
238		208	Local<Function> callback = callback_v.As<Function>();
239		208	return MakeCallback(isolate, recv, callback, argc, argv, asyncContext);
240			}
241
242		208	MaybeLocal<Value> MakeCallback(Isolate* isolate,
243			Local<Object> recv,
244			Local<Function> callback,
245			int argc,
246			Local<Value> argv[],
247			async_context asyncContext) {
248			// Observe the following two subtleties:
249			//
250			// 1. The environment is retrieved from the callback function's context.
251			// 2. The context to enter is retrieved from the environment.
252			//
253			// Because of the AssignToContext() call in src/node_contextify.cc,
254			// the two contexts need not be the same.
255		208	Environment* env = Environment::GetCurrent(callback->CreationContext());
256	✗✓	208	CHECK_NOT_NULL(env);
257		208	Context::Scope context_scope(env->context());
258			MaybeLocal<Value> ret =
259		208	InternalMakeCallback(env, recv, recv, callback, argc, argv, asyncContext);
260	✗✓✗✗ ✗✓	208	if (ret.IsEmpty() && env->async_callback_scope_depth() == 0) {
261			// This is only for legacy compatibility and we may want to look into
262			// removing/adjusting it.
263			return Undefined(env->isolate());
264			}
265		208	return ret;
266			}
267
268			// Use this if you just want to safely invoke some JS callback and
269			// would like to retain the currently active async_context, if any.
270			// In case none is available, a fixed default context will be
271			// installed otherwise.
272			MaybeLocal<Value> MakeSyncCallback(Isolate* isolate,
273			Local<Object> recv,
274			Local<Function> callback,
275			int argc,
276			Local<Value> argv[]) {
277			Environment* env = Environment::GetCurrent(callback->CreationContext());
278			CHECK_NOT_NULL(env);
279			if (!env->can_call_into_js()) return Local<Value>();
280
281			Context::Scope context_scope(env->context());
282			if (env->async_callback_scope_depth()) {
283			// There's another MakeCallback() on the stack, piggy back on it.
284			// In particular, retain the current async_context.
285			return callback->Call(env->context(), recv, argc, argv);
286			}
287
288			// This is a toplevel invocation and the caller (intentionally)
289			// didn't provide any async_context to run in. Install a default context.
290			MaybeLocal<Value> ret =
291			InternalMakeCallback(env, env->process_object(), recv, callback, argc, argv,
292			async_context{0, 0});
293			return ret;
294			}
295
296			// Legacy MakeCallback()s
297
298			Local<Value> MakeCallback(Isolate* isolate,
299			Local<Object> recv,
300			const char* method,
301			int argc,
302			Local<Value>* argv) {
303			EscapableHandleScope handle_scope(isolate);
304			return handle_scope.Escape(
305			MakeCallback(isolate, recv, method, argc, argv, {0, 0})
306			.FromMaybe(Local<Value>()));
307			}
308
309			Local<Value> MakeCallback(Isolate* isolate,
310			Local<Object> recv,
311			Local<String> symbol,
312			int argc,
313			Local<Value>* argv) {
314			EscapableHandleScope handle_scope(isolate);
315			return handle_scope.Escape(
316			MakeCallback(isolate, recv, symbol, argc, argv, {0, 0})
317			.FromMaybe(Local<Value>()));
318			}
319
320			Local<Value> MakeCallback(Isolate* isolate,
321			Local<Object> recv,
322			Local<Function> callback,
323			int argc,
324			Local<Value>* argv) {
325			EscapableHandleScope handle_scope(isolate);
326			return handle_scope.Escape(
327			MakeCallback(isolate, recv, callback, argc, argv, {0, 0})
328			.FromMaybe(Local<Value>()));
329			}
330
331	✓✗✓✗	366	} // namespace node