content/renderer/renderer_main.cc

// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include <stddef.h>
#include <utility>

#include "base/base_switches.h"
#include "base/command_line.h"
#include "base/debug/debugger.h"
#include "base/debug/leak_annotations.h"
#include "base/i18n/rtl.h"
#include "base/message_loop/message_loop.h"
#include "base/metrics/histogram_macros.h"
#include "base/metrics/statistics_recorder.h"
#include "base/pending_task.h"
#include "base/run_loop.h"
#include "base/strings/string_util.h"
#include "base/sys_info.h"
#include "base/threading/platform_thread.h"
#include "base/timer/hi_res_timer_manager.h"
#include "base/trace_event/trace_event.h"
#include "build/build_config.h"
#include "content/child/child_process.h"
#include "content/common/content_constants_internal.h"
#include "content/common/mojo/mojo_shell_connection_impl.h"
#include "content/public/common/content_switches.h"
#include "content/public/common/main_function_params.h"
#include "content/public/renderer/content_renderer_client.h"
#include "content/renderer/render_process_impl.h"
#include "content/renderer/render_thread_impl.h"
#include "content/renderer/renderer_main_platform_delegate.h"
#include "third_party/WebKit/public/platform/scheduler/renderer/renderer_scheduler.h"
#include "third_party/skia/include/core/SkGraphics.h"
#include "ui/base/ui_base_switches.h"

#if defined(OS_ANDROID)
#include "base/android/library_loader/library_loader_hooks.h"
#endif  // OS_ANDROID

#if defined(OS_MACOSX)
#include <Carbon/Carbon.h>
#include <signal.h>
#include <unistd.h>

#include "base/mac/scoped_nsautorelease_pool.h"
#include "base/message_loop/message_pump_mac.h"
#include "third_party/WebKit/public/web/WebView.h"
#endif  // OS_MACOSX

#if defined(ENABLE_PLUGINS)
#include "content/renderer/pepper/pepper_plugin_registry.h"
#endif

#if defined(ENABLE_WEBRTC)
#include "third_party/webrtc_overrides/init_webrtc.h"
#endif

#if defined(USE_OZONE)
#include "ui/ozone/public/client_native_pixmap_factory.h"
#endif

namespace content {
namespace {
// This function provides some ways to test crash and assertion handling
// behavior of the renderer.
static void HandleRendererErrorTestParameters(
    const base::CommandLine& command_line) {
  if (command_line.HasSwitch(switches::kWaitForDebugger))
    base::debug::WaitForDebugger(60, true);

  if (command_line.HasSwitch(switches::kRendererStartupDialog))
    ChildProcess::WaitForDebugger("Renderer");
}

#if defined(USE_OZONE)
base::LazyInstance<std::unique_ptr<ui::ClientNativePixmapFactory>>
    g_pixmap_factory = LAZY_INSTANCE_INITIALIZER;
#endif

}  // namespace

// mainline routine for running as the Renderer process
int RendererMain(const MainFunctionParams& parameters) {
  // Don't use the TRACE_EVENT0 macro because the tracing infrastructure doesn't
  // expect synchronous events around the main loop of a thread.
  TRACE_EVENT_ASYNC_BEGIN0("startup", "RendererMain", 0);

  base::trace_event::TraceLog::GetInstance()->SetProcessName("Renderer");
  base::trace_event::TraceLog::GetInstance()->SetProcessSortIndex(
      kTraceEventRendererProcessSortIndex);

  const base::CommandLine& parsed_command_line = parameters.command_line;

#if defined(OS_MACOSX)
  base::mac::ScopedNSAutoreleasePool* pool = parameters.autorelease_pool;
#endif  // OS_MACOSX

#if defined(OS_CHROMEOS)
  // As Zygote process starts up earlier than browser process gets its own
  // locale (at login time for Chrome OS), we have to set the ICU default
  // locale for renderer process here.
  // ICU locale will be used for fallback font selection etc.
  if (parsed_command_line.HasSwitch(switches::kLang)) {
    const std::string locale =
        parsed_command_line.GetSwitchValueASCII(switches::kLang);
    base::i18n::SetICUDefaultLocale(locale);
  }
#endif

  SkGraphics::Init();
#if defined(OS_ANDROID)
  const int kMB = 1024 * 1024;
  size_t font_cache_limit =
      base::SysInfo::IsLowEndDevice() ? kMB : 8 * kMB;
  SkGraphics::SetFontCacheLimit(font_cache_limit);
#endif

#if defined(USE_OZONE)
  g_pixmap_factory.Get() = ui::ClientNativePixmapFactory::Create();
  ui::ClientNativePixmapFactory::SetInstance(g_pixmap_factory.Get().get());
#endif

  // This function allows pausing execution using the --renderer-startup-dialog
  // flag allowing us to attach a debugger.
  // Do not move this function down since that would mean we can't easily debug
  // whatever occurs before it.
  HandleRendererErrorTestParameters(parsed_command_line);

  RendererMainPlatformDelegate platform(parameters);
#if defined(OS_MACOSX)
  // As long as scrollbars on Mac are painted with Cocoa, the message pump
  // needs to be backed by a Foundation-level loop to process NSTimers. See
  // http://crbug.com/306348#c24 for details.
  std::unique_ptr<base::MessagePump> pump(new base::MessagePumpNSRunLoop());
  std::unique_ptr<base::MessageLoop> main_message_loop(
      new base::MessageLoop(std::move(pump)));
#else
  // The main message loop of the renderer services doesn't have IO or UI tasks.
  std::unique_ptr<base::MessageLoop> main_message_loop(new base::MessageLoop());
#endif

  base::PlatformThread::SetName("CrRendererMain");

  bool no_sandbox = parsed_command_line.HasSwitch(switches::kNoSandbox);

  // Initialize histogram statistics gathering system.
  base::StatisticsRecorder::Initialize();

#if defined(OS_ANDROID)
  // If we have any pending LibraryLoader histograms, record them.
  base::android::RecordLibraryLoaderRendererHistograms();
#endif

  std::unique_ptr<blink::scheduler::RendererScheduler> renderer_scheduler(
      blink::scheduler::RendererScheduler::Create());

  // PlatformInitialize uses FieldTrials, so this must happen later.
  platform.PlatformInitialize();

#if defined(ENABLE_PLUGINS)
  // Load pepper plugins before engaging the sandbox.
  PepperPluginRegistry::GetInstance();
#endif
#if defined(ENABLE_WEBRTC)
  // Initialize WebRTC before engaging the sandbox.
  // NOTE: On linux, this call could already have been made from
  // zygote_main_linux.cc.  However, calling multiple times from the same thread
  // is OK.
  InitializeWebRtcModule();
#endif

  {
#if defined(OS_WIN) || defined(OS_MACOSX)
    // TODO(markus): Check if it is OK to unconditionally move this
    // instruction down.
    RenderProcessImpl render_process;
    RenderThreadImpl::Create(std::move(main_message_loop),
                             std::move(renderer_scheduler));
#endif
    bool run_loop = true;
    if (!no_sandbox)
      run_loop = platform.EnableSandbox();
#if defined(OS_POSIX) && !defined(OS_MACOSX)
    RenderProcessImpl render_process;
    RenderThreadImpl::Create(std::move(main_message_loop),
                             std::move(renderer_scheduler));
#endif

    base::HighResolutionTimerManager hi_res_timer_manager;

    if (run_loop) {
#if defined(OS_MACOSX)
      if (pool)
        pool->Recycle();
#endif
      TRACE_EVENT_ASYNC_BEGIN0("toplevel", "RendererMain.START_MSG_LOOP", 0);
      base::RunLoop().Run();
      TRACE_EVENT_ASYNC_END0("toplevel", "RendererMain.START_MSG_LOOP", 0);
    }

#if defined(LEAK_SANITIZER)
    // Run leak detection before RenderProcessImpl goes out of scope. This helps
    // ignore shutdown-only leaks.
    __lsan_do_leak_check();
#endif
  }
  platform.PlatformUninitialize();
  TRACE_EVENT_ASYNC_END0("startup", "RendererMain", 0);
  return 0;
}

}  // namespace content