GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: node_task_queue.cc Lines: 104 113 92.0 %
Date: 2021-10-07 04:12:46 Branches: 50 74 67.6 %

Line Branch Exec Source
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#include "async_wrap.h"
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#include "env-inl.h"
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#include "node.h"
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#include "node_errors.h"
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#include "node_external_reference.h"
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#include "node_internals.h"
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#include "node_process-inl.h"
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#include "util-inl.h"
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#include "v8.h"
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#include <atomic>
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namespace node {
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using errors::TryCatchScope;
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using v8::Context;
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using v8::Function;
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using v8::FunctionCallbackInfo;
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using v8::Isolate;
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using v8::Just;
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using v8::kPromiseHandlerAddedAfterReject;
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using v8::kPromiseRejectAfterResolved;
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using v8::kPromiseRejectWithNoHandler;
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using v8::kPromiseResolveAfterResolved;
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using v8::Local;
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using v8::Maybe;
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using v8::Number;
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using v8::Object;
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using v8::Promise;
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using v8::PromiseRejectEvent;
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using v8::PromiseRejectMessage;
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using v8::Value;
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56120
static Maybe<double> GetAssignedPromiseAsyncId(Environment* env,
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                                               Local<Promise> promise,
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                                               Local<Value> id_symbol) {
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  Local<Value> maybe_async_id;
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112240
  if (!promise->Get(env->context(), id_symbol).ToLocal(&maybe_async_id)) {
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    return v8::Just(AsyncWrap::kInvalidAsyncId);
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  }
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56120
  return maybe_async_id->IsNumber()
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      ? maybe_async_id->NumberValue(env->context())
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56136
      : v8::Just(AsyncWrap::kInvalidAsyncId);
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}
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56104
static Maybe<double> GetAssignedPromiseWrapAsyncId(Environment* env,
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                                                   Local<Promise> promise,
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                                                   Local<Value> id_symbol) {
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  // This check is imperfect. If the internal field is set, it should
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  // be an object. If it's not, we just ignore it. Ideally v8 would
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  // have had GetInternalField returning a MaybeLocal but this works
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  // for now.
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112208
  Local<Value> promiseWrap = promise->GetInternalField(0);
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56104
  if (promiseWrap->IsObject()) {
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        Local<Value> maybe_async_id;
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    if (!promiseWrap.As<Object>()->Get(env->context(), id_symbol)
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        .ToLocal(&maybe_async_id)) {
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      return v8::Just(AsyncWrap::kInvalidAsyncId);
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    }
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    return maybe_async_id->IsNumber()
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        ? maybe_async_id->NumberValue(env->context())
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        : v8::Just(AsyncWrap::kInvalidAsyncId);
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  } else {
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56104
      return v8::Just(AsyncWrap::kInvalidAsyncId);
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  }
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}
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28061
void PromiseRejectCallback(PromiseRejectMessage message) {
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  static std::atomic<uint64_t> unhandledRejections{0};
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  static std::atomic<uint64_t> rejectionsHandledAfter{0};
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28061
  Local<Promise> promise = message.GetPromise();
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28061
  Isolate* isolate = promise->GetIsolate();
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28061
  PromiseRejectEvent event = message.GetEvent();
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28061
  Environment* env = Environment::GetCurrent(isolate);
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78

28061
  if (env == nullptr || !env->can_call_into_js()) return;
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28060
  Local<Function> callback = env->promise_reject_callback();
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  // The promise is rejected before JS land calls SetPromiseRejectCallback
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  // to initializes the promise reject callback during bootstrap.
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28060
  CHECK(!callback.IsEmpty());
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  Local<Value> value;
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28060
  Local<Value> type = Number::New(env->isolate(), event);
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28060
  if (event == kPromiseRejectWithNoHandler) {
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    value = message.GetValue();
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    unhandledRejections++;
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12212
    TRACE_COUNTER2(TRACING_CATEGORY_NODE2(promises, rejections),
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                  "rejections",
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                  "unhandled", unhandledRejections,
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                  "handledAfter", rejectionsHandledAfter);
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  } else if (event == kPromiseHandlerAddedAfterReject) {
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    value = Undefined(isolate);
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    rejectionsHandledAfter++;
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10796
    TRACE_COUNTER2(TRACING_CATEGORY_NODE2(promises, rejections),
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                  "rejections",
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                  "unhandled", unhandledRejections,
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                  "handledAfter", rejectionsHandledAfter);
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5399
  } else if (event == kPromiseResolveAfterResolved) {
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    value = message.GetValue();
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  } else if (event == kPromiseRejectAfterResolved) {
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    value = message.GetValue();
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  } else {
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    return;
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  }
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28060
  if (value.IsEmpty()) {
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    value = Undefined(isolate);
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  }
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28060
  Local<Value> args[] = { type, promise, value };
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28060
  double async_id = AsyncWrap::kInvalidAsyncId;
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28060
  double trigger_async_id = AsyncWrap::kInvalidAsyncId;
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28060
  TryCatchScope try_catch(env);
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56120
  if (!GetAssignedPromiseAsyncId(env, promise, env->async_id_symbol())
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28060
          .To(&async_id)) return;
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56120
  if (!GetAssignedPromiseAsyncId(env, promise, env->trigger_async_id_symbol())
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28060
          .To(&trigger_async_id)) return;
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28060
  if (async_id == AsyncWrap::kInvalidAsyncId &&
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      trigger_async_id == AsyncWrap::kInvalidAsyncId) {
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    // That means that promise might be a PromiseWrap, so we'll
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    // check there as well.
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56104
    if (!GetAssignedPromiseWrapAsyncId(env, promise, env->async_id_symbol())
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28052
              .To(&async_id)) return;
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56104
    if (!GetAssignedPromiseWrapAsyncId(
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56104
          env, promise, env->trigger_async_id_symbol())
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28052
              .To(&trigger_async_id)) return;
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  }
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28060
  if (async_id != AsyncWrap::kInvalidAsyncId &&
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      trigger_async_id != AsyncWrap::kInvalidAsyncId) {
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    env->async_hooks()->push_async_context(
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        async_id, trigger_async_id, promise);
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  }
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28060
  USE(callback->Call(
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56120
      env->context(), Undefined(isolate), arraysize(args), args));
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56128
  if (async_id != AsyncWrap::kInvalidAsyncId &&
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28068
      trigger_async_id != AsyncWrap::kInvalidAsyncId &&
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      env->execution_async_id() == async_id) {
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    // This condition might not be true if async_hooks was enabled during
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    // the promise callback execution.
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    env->async_hooks()->pop_async_context(async_id);
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  }
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  // V8 does not expect this callback to have a scheduled exceptions once it
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  // returns, so we print them out in a best effort to do something about it
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  // without failing silently and without crashing the process.
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28060
  if (try_catch.HasCaught() && !try_catch.HasTerminated()) {
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    fprintf(stderr, "Exception in PromiseRejectCallback:\n");
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    PrintCaughtException(isolate, env->context(), try_catch);
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  }
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}
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namespace task_queue {
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static void EnqueueMicrotask(const FunctionCallbackInfo<Value>& args) {
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  Environment* env = Environment::GetCurrent(args);
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  Isolate* isolate = env->isolate();
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  CHECK(args[0]->IsFunction());
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  isolate->GetCurrentContext()->GetMicrotaskQueue()
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      ->EnqueueMicrotask(isolate, args[0].As<Function>());
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}
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213383
static void RunMicrotasks(const FunctionCallbackInfo<Value>& args) {
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213383
  Environment* env = Environment::GetCurrent(args);
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  env->context()->GetMicrotaskQueue()->PerformCheckpoint(env->isolate());
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}
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static void SetTickCallback(const FunctionCallbackInfo<Value>& args) {
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  Environment* env = Environment::GetCurrent(args);
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  CHECK(args[0]->IsFunction());
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  env->set_tick_callback_function(args[0].As<Function>());
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}
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static void SetPromiseRejectCallback(
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    const FunctionCallbackInfo<Value>& args) {
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  Environment* env = Environment::GetCurrent(args);
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  CHECK(args[0]->IsFunction());
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  env->set_promise_reject_callback(args[0].As<Function>());
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}
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static void Initialize(Local<Object> target,
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                       Local<Value> unused,
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                       Local<Context> context,
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                       void* priv) {
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  Environment* env = Environment::GetCurrent(context);
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  Isolate* isolate = env->isolate();
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  env->SetMethod(target, "enqueueMicrotask", EnqueueMicrotask);
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  env->SetMethod(target, "setTickCallback", SetTickCallback);
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  env->SetMethod(target, "runMicrotasks", RunMicrotasks);
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  target->Set(env->context(),
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              FIXED_ONE_BYTE_STRING(isolate, "tickInfo"),
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              env->tick_info()->fields().GetJSArray()).Check();
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  Local<Object> events = Object::New(isolate);
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  NODE_DEFINE_CONSTANT(events, kPromiseRejectWithNoHandler);
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  NODE_DEFINE_CONSTANT(events, kPromiseHandlerAddedAfterReject);
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  NODE_DEFINE_CONSTANT(events, kPromiseResolveAfterResolved);
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  NODE_DEFINE_CONSTANT(events, kPromiseRejectAfterResolved);
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  target->Set(env->context(),
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              FIXED_ONE_BYTE_STRING(isolate, "promiseRejectEvents"),
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              events).Check();
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  env->SetMethod(target,
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                 "setPromiseRejectCallback",
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                 SetPromiseRejectCallback);
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}
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4853
void RegisterExternalReferences(ExternalReferenceRegistry* registry) {
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4853
  registry->Register(EnqueueMicrotask);
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4853
  registry->Register(SetTickCallback);
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  registry->Register(RunMicrotasks);
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  registry->Register(SetPromiseRejectCallback);
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4853
}
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}  // namespace task_queue
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}  // namespace node
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4926
NODE_MODULE_CONTEXT_AWARE_INTERNAL(task_queue, node::task_queue::Initialize)
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4853
NODE_MODULE_EXTERNAL_REFERENCE(task_queue,
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                               node::task_queue::RegisterExternalReferences)