GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: api/callback.cc Lines: 139 155 89.7 %
Date: 2022-07-25 04:16:17 Branches: 81 96 84.4 %

Line Branch Exec Source
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#include "node.h"
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#include "async_wrap-inl.h"
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#include "env-inl.h"
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#include "v8.h"
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namespace node {
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using v8::Context;
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using v8::EscapableHandleScope;
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using v8::Function;
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using v8::HandleScope;
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using v8::Isolate;
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using v8::Local;
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using v8::MaybeLocal;
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using v8::Object;
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using v8::String;
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using v8::Value;
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CallbackScope::CallbackScope(Isolate* isolate,
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                             Local<Object> object,
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                             async_context async_context)
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4
  : CallbackScope(Environment::GetCurrent(isolate), object, async_context) {}
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CallbackScope::CallbackScope(Environment* env,
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                             Local<Object> object,
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                             async_context asyncContext)
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  : private_(new InternalCallbackScope(env,
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                                       object,
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115551
                                       asyncContext)),
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    try_catch_(env->isolate()) {
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115551
  try_catch_.SetVerbose(true);
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115551
}
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CallbackScope::~CallbackScope() {
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115550
  if (try_catch_.HasCaught())
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    private_->MarkAsFailed();
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115550
  delete private_;
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115550
}
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InternalCallbackScope::InternalCallbackScope(AsyncWrap* async_wrap, int flags)
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    : InternalCallbackScope(async_wrap->env(),
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                            async_wrap->object(),
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                            { async_wrap->get_async_id(),
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                              async_wrap->get_trigger_async_id() },
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                            flags) {}
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816398
InternalCallbackScope::InternalCallbackScope(Environment* env,
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                                             Local<Object> object,
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                                             const async_context& asyncContext,
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816398
                                             int flags)
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  : env_(env),
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    async_context_(asyncContext),
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    object_(object),
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    skip_hooks_(flags & kSkipAsyncHooks),
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    skip_task_queues_(flags & kSkipTaskQueues) {
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816398
  CHECK_NOT_NULL(env);
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  env->PushAsyncCallbackScope();
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  if (!env->can_call_into_js()) {
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    failed_ = true;
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    return;
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  }
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  Isolate* isolate = env->isolate();
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  HandleScope handle_scope(isolate);
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  Local<Context> current_context = isolate->GetCurrentContext();
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  // If you hit this assertion, the caller forgot to enter the right Node.js
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  // Environment's v8::Context first.
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  // We first check `env->context() != current_context` because the contexts
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  // likely *are* the same, in which case we can skip the slightly more
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  // expensive Environment::GetCurrent() call.
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  if (UNLIKELY(env->context() != current_context)) {
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    CHECK_EQ(Environment::GetCurrent(isolate), env);
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  }
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  isolate->SetIdle(false);
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  env->async_hooks()->push_async_context(
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    async_context_.async_id, async_context_.trigger_async_id, object);
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  pushed_ids_ = true;
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  if (asyncContext.async_id != 0 && !skip_hooks_) {
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    // No need to check a return value because the application will exit if
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    // an exception occurs.
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    AsyncWrap::EmitBefore(env, asyncContext.async_id);
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  }
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}
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InternalCallbackScope::~InternalCallbackScope() {
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  Close();
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  env_->PopAsyncCallbackScope();
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}
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void InternalCallbackScope::Close() {
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  if (closed_) return;
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  closed_ = true;
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  Isolate* isolate = env_->isolate();
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  auto idle = OnScopeLeave([&]() { isolate->SetIdle(true); });
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  if (!env_->can_call_into_js()) return;
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  auto perform_stopping_check = [&]() {
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    if (env_->is_stopping()) {
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      MarkAsFailed();
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      env_->async_hooks()->clear_async_id_stack();
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    }
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  };
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  perform_stopping_check();
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  if (!failed_ && async_context_.async_id != 0 && !skip_hooks_) {
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    AsyncWrap::EmitAfter(env_, async_context_.async_id);
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  }
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  if (pushed_ids_)
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    env_->async_hooks()->pop_async_context(async_context_.async_id);
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  if (failed_) return;
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  if (env_->async_callback_scope_depth() > 1 || skip_task_queues_) {
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    return;
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  }
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  TickInfo* tick_info = env_->tick_info();
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  if (!env_->can_call_into_js()) return;
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  auto weakref_cleanup = OnScopeLeave([&]() { env_->RunWeakRefCleanup(); });
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  Local<Context> context = env_->context();
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  if (!tick_info->has_tick_scheduled()) {
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    context->GetMicrotaskQueue()->PerformCheckpoint(isolate);
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    perform_stopping_check();
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  }
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  // Make sure the stack unwound properly. If there are nested MakeCallback's
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  // then it should return early and not reach this code.
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  if (env_->async_hooks()->fields()[AsyncHooks::kTotals]) {
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    CHECK_EQ(env_->execution_async_id(), 0);
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    CHECK_EQ(env_->trigger_async_id(), 0);
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  }
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720580
  if (!tick_info->has_tick_scheduled() && !tick_info->has_rejection_to_warn()) {
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    return;
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  }
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  HandleScope handle_scope(isolate);
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  Local<Object> process = env_->process_object();
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  if (!env_->can_call_into_js()) return;
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  Local<Function> tick_callback = env_->tick_callback_function();
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  // The tick is triggered before JS land calls SetTickCallback
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  // to initializes the tick callback during bootstrap.
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  CHECK(!tick_callback.IsEmpty());
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  if (tick_callback->Call(context, process, 0, nullptr).IsEmpty()) {
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    failed_ = true;
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  }
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  perform_stopping_check();
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}
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MaybeLocal<Value> InternalMakeCallback(Environment* env,
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                                       Local<Object> resource,
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                                       Local<Object> recv,
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                                       const Local<Function> callback,
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                                       int argc,
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                                       Local<Value> argv[],
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                                       async_context asyncContext) {
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  CHECK(!recv.IsEmpty());
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#ifdef DEBUG
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  for (int i = 0; i < argc; i++)
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    CHECK(!argv[i].IsEmpty());
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#endif
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  Local<Function> hook_cb = env->async_hooks_callback_trampoline();
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  int flags = InternalCallbackScope::kNoFlags;
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  bool use_async_hooks_trampoline = false;
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  AsyncHooks* async_hooks = env->async_hooks();
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  if (!hook_cb.IsEmpty()) {
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    // Use the callback trampoline if there are any before or after hooks, or
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    // we can expect some kind of usage of async_hooks.executionAsyncResource().
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    flags = InternalCallbackScope::kSkipAsyncHooks;
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    use_async_hooks_trampoline =
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        async_hooks->fields()[AsyncHooks::kBefore] +
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        async_hooks->fields()[AsyncHooks::kAfter] +
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        async_hooks->fields()[AsyncHooks::kUsesExecutionAsyncResource] > 0;
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  }
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  InternalCallbackScope scope(env, resource, asyncContext, flags);
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422881
  if (scope.Failed()) {
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    return MaybeLocal<Value>();
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  }
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  MaybeLocal<Value> ret;
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  Local<Context> context = env->context();
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  if (use_async_hooks_trampoline) {
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    MaybeStackBuffer<Local<Value>, 16> args(3 + argc);
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    args[0] = v8::Number::New(env->isolate(), asyncContext.async_id);
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    args[1] = resource;
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    args[2] = callback;
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    for (int i = 0; i < argc; i++) {
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      args[i + 3] = argv[i];
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    }
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    ret = hook_cb->Call(context, recv, args.length(), &args[0]);
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  } else {
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    ret = callback->Call(context, recv, argc, argv);
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  }
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  if (ret.IsEmpty()) {
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    scope.MarkAsFailed();
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    return MaybeLocal<Value>();
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  }
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  scope.Close();
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  if (scope.Failed()) {
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    return MaybeLocal<Value>();
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  }
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  return ret;
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}
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// Public MakeCallback()s
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MaybeLocal<Value> MakeCallback(Isolate* isolate,
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                               Local<Object> recv,
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                               const char* method,
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                               int argc,
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                               Local<Value> argv[],
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                               async_context asyncContext) {
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  Local<String> method_string =
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      String::NewFromUtf8(isolate, method).ToLocalChecked();
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  return MakeCallback(isolate, recv, method_string, argc, argv, asyncContext);
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}
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MaybeLocal<Value> MakeCallback(Isolate* isolate,
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                               Local<Object> recv,
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                               Local<String> symbol,
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                               int argc,
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                               Local<Value> argv[],
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                               async_context asyncContext) {
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  // Check can_call_into_js() first because calling Get() might do so.
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  Environment* env =
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      Environment::GetCurrent(recv->GetCreationContext().ToLocalChecked());
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  CHECK_NOT_NULL(env);
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  if (!env->can_call_into_js()) return Local<Value>();
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  Local<Value> callback_v;
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  if (!recv->Get(isolate->GetCurrentContext(), symbol).ToLocal(&callback_v))
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    return Local<Value>();
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  if (!callback_v->IsFunction()) {
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    // This used to return an empty value, but Undefined() makes more sense
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    // since no exception is pending here.
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    return Undefined(isolate);
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  }
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  Local<Function> callback = callback_v.As<Function>();
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  return MakeCallback(isolate, recv, callback, argc, argv, asyncContext);
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}
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MaybeLocal<Value> MakeCallback(Isolate* isolate,
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                               Local<Object> recv,
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                               Local<Function> callback,
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                               int argc,
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                               Local<Value> argv[],
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                               async_context asyncContext) {
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  // Observe the following two subtleties:
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  //
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  // 1. The environment is retrieved from the callback function's context.
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  // 2. The context to enter is retrieved from the environment.
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  //
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  // Because of the AssignToContext() call in src/node_contextify.cc,
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  // the two contexts need not be the same.
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  Environment* env =
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      Environment::GetCurrent(callback->GetCreationContext().ToLocalChecked());
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56705
  CHECK_NOT_NULL(env);
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56705
  Context::Scope context_scope(env->context());
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  MaybeLocal<Value> ret =
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      InternalMakeCallback(env, recv, recv, callback, argc, argv, asyncContext);
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56686
  if (ret.IsEmpty() && env->async_callback_scope_depth() == 0) {
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    // This is only for legacy compatibility and we may want to look into
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    // removing/adjusting it.
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    return Undefined(isolate);
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  }
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  return ret;
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}
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// Use this if you just want to safely invoke some JS callback and
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// would like to retain the currently active async_context, if any.
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// In case none is available, a fixed default context will be
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// installed otherwise.
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MaybeLocal<Value> MakeSyncCallback(Isolate* isolate,
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                                   Local<Object> recv,
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                                   Local<Function> callback,
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                                   int argc,
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                                   Local<Value> argv[]) {
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  Environment* env =
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      Environment::GetCurrent(callback->GetCreationContext().ToLocalChecked());
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  CHECK_NOT_NULL(env);
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  if (!env->can_call_into_js()) return Local<Value>();
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  Local<Context> context = env->context();
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  Context::Scope context_scope(context);
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  if (env->async_callback_scope_depth()) {
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    // There's another MakeCallback() on the stack, piggy back on it.
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    // In particular, retain the current async_context.
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    return callback->Call(context, recv, argc, argv);
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  }
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  // This is a toplevel invocation and the caller (intentionally)
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  // didn't provide any async_context to run in. Install a default context.
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  MaybeLocal<Value> ret =
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    InternalMakeCallback(env, env->process_object(), recv, callback, argc, argv,
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                         async_context{0, 0});
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  return ret;
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}
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// Legacy MakeCallback()s
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Local<Value> MakeCallback(Isolate* isolate,
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                          Local<Object> recv,
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                          const char* method,
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                          int argc,
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                          Local<Value>* argv) {
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  EscapableHandleScope handle_scope(isolate);
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  return handle_scope.Escape(
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      MakeCallback(isolate, recv, method, argc, argv, {0, 0})
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          .FromMaybe(Local<Value>()));
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}
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Local<Value> MakeCallback(Isolate* isolate,
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                          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
}
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345
Local<Value> MakeCallback(Isolate* isolate,
346
                          Local<Object> recv,
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                          Local<Function> callback,
348
                          int argc,
349
                          Local<Value>* argv) {
350
  EscapableHandleScope handle_scope(isolate);
351
  return handle_scope.Escape(
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      MakeCallback(isolate, recv, callback, argc, argv, {0, 0})
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          .FromMaybe(Local<Value>()));
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}
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}  // namespace node