text: // Copyright (c) 2015 GitHub, Inc.
  // Use of this source code is governed by the MIT license that can be
  // found in the LICENSE file.
  
  #include "shell/app/node_main.h"
  
  #include <memory>
  #include <string>
  #include <utility>
  
  #include "base/command_line.h"
  #include "base/feature_list.h"
  #include "base/task/thread_pool/thread_pool.h"
  #include "base/threading/thread_task_runner_handle.h"
  #include "electron/electron_version.h"
  #include "gin/array_buffer.h"
  #include "gin/public/isolate_holder.h"
  #include "gin/v8_initializer.h"
  #include "native_mate/dictionary.h"
  #include "shell/app/uv_task_runner.h"
  #include "shell/browser/javascript_environment.h"
  #include "shell/browser/node_debugger.h"
  #include "shell/common/api/electron_bindings.h"
  #include "shell/common/crash_reporter/crash_reporter.h"
  #include "shell/common/native_mate_converters/string16_converter.h"
  #include "shell/common/node_bindings.h"
  #include "shell/common/node_includes.h"
  
  #if defined(_WIN64)
  #include "shell/common/crash_reporter/crash_reporter_win.h"
  #endif
  
  namespace electron {
  
  #if !defined(OS_LINUX)
  void AddExtraParameter(const std::string& key, const std::string& value) {
    crash_reporter::CrashReporter::GetInstance()->AddExtraParameter(key, value);
  }
  
  void RemoveExtraParameter(const std::string& key) {
    crash_reporter::CrashReporter::GetInstance()->RemoveExtraParameter(key);
  }
  #endif
  
  int NodeMain(int argc, char* argv[]) {
    base::CommandLine::Init(argc, argv);
  
    int exit_code = 1;
    {
      // Feed gin::PerIsolateData with a task runner.
      argv = uv_setup_args(argc, argv);
      uv_loop_t* loop = uv_default_loop();
      scoped_refptr<UvTaskRunner> uv_task_runner(new UvTaskRunner(loop));
      base::ThreadTaskRunnerHandle handle(uv_task_runner);
  
      // Initialize feature list.
      auto feature_list = std::make_unique<base::FeatureList>();
      feature_list->InitializeFromCommandLine("", "");
      base::FeatureList::SetInstance(std::move(feature_list));
  
  #if defined(_WIN64)
      crash_reporter::CrashReporterWin::SetUnhandledExceptionFilter();
  #endif
  
      // Explicitly register electron's builtin modules.
      NodeBindings::RegisterBuiltinModules();
  
      int exec_argc;
      const char** exec_argv;
      node::Init(&argc, const_cast<const char**>(argv), &exec_argc, &exec_argv);
  
      gin::V8Initializer::LoadV8Snapshot(
          gin::V8Initializer::V8SnapshotFileType::kWithAdditionalContext);
      gin::V8Initializer::LoadV8Natives();
  
      // V8 requires a task scheduler apparently
      base::ThreadPoolInstance::CreateAndStartWithDefaultParams("Electron");
  
      // Initialize gin::IsolateHolder.
      JavascriptEnvironment gin_env(loop);
  
      node::Environment* env = node::CreateEnvironment(
          node::CreateIsolateData(gin_env.isolate(), loop, gin_env.platform()),
          gin_env.context(), argc, argv, exec_argc, exec_argv, false);
  
      // Enable support for v8 inspector.
      NodeDebugger node_debugger(env);
      node_debugger.Start();
  
      node::BootstrapEnvironment(env);
  
      mate::Dictionary process(gin_env.isolate(), env->process_object());
  #if defined(OS_WIN)
      process.SetMethod("log", &ElectronBindings::Log);
  #endif
      process.SetMethod("crash", &ElectronBindings::Crash);
  
      // Setup process.crashReporter.start in child node processes
      auto reporter = mate::Dictionary::CreateEmpty(gin_env.isolate());
      reporter.SetMethod("start", &crash_reporter::CrashReporter::StartInstance);
  
  #if !defined(OS_LINUX)
      reporter.SetMethod("addExtraParameter", &AddExtraParameter);
      reporter.SetMethod("removeExtraParameter", &RemoveExtraParameter);
  #endif
  
      process.Set("crashReporter", reporter);
  
      mate::Dictionary versions;
      if (process.Get("versions", &versions)) {
        versions.SetReadOnly(ELECTRON_PROJECT_NAME, ELECTRON_VERSION_STRING);
      }
  
      node::LoadEnvironment(env);
  
      bool more;
      do {
        more = uv_run(env->event_loop(), UV_RUN_ONCE);
        gin_env.platform()->DrainTasks(env->isolate());
        if (more == false) {
          node::EmitBeforeExit(env);
  
          // Emit `beforeExit` if the loop became alive either after emitting
          // event, or after running some callbacks.
          more = uv_loop_alive(env->event_loop());
          if (uv_run(env->event_loop(), UV_RUN_NOWAIT) != 0)
            more = true;
        }
      } while (more == true);
  
      node_debugger.Stop();
      exit_code = node::EmitExit(env);
      env->set_can_call_into_js(false);
      node::RunAtExit(env);
  
      v8::Isolate* isolate = env->isolate();
      node::FreeEnvironment(env);
  
      gin_env.platform()->DrainTasks(isolate);
      gin_env.platform()->CancelPendingDelayedTasks(isolate);
      gin_env.platform()->UnregisterIsolate(isolate);
    }
  
    // According to "src/gin/shell/gin_main.cc":
    //
    // gin::IsolateHolder waits for tasks running in ThreadPool in its
    // destructor and thus must be destroyed before ThreadPool starts skipping
    // CONTINUE_ON_SHUTDOWN tasks.
    base::ThreadPoolInstance::Get()->Shutdown();
  
    v8::V8::Dispose();
  
    return exit_code;
  }
  
  }  // namespace electron
  