content/renderer/renderer_main.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "base/base_switches.h"
   6 #include "base/command_line.h"
   7 #include "base/debug/debugger.h"
   8 #include "base/debug/stack_trace.h"
   9 #include "base/debug/trace_event.h"
  10 #include "base/i18n/rtl.h"
  11 #include "base/memory/ref_counted.h"
  12 #include "base/message_loop/message_loop.h"
  13 #include "base/metrics/field_trial.h"
  14 #include "base/metrics/histogram.h"
  15 #include "base/metrics/statistics_recorder.h"
  16 #include "base/metrics/stats_counters.h"
  17 #include "base/path_service.h"
  18 #include "base/pending_task.h"
  19 #include "base/strings/string_util.h"
  20 #include "base/sys_info.h"
  21 #include "base/threading/platform_thread.h"
  22 #include "base/time/time.h"
  23 #include "base/timer/hi_res_timer_manager.h"
  24 #include "content/child/child_process.h"
  25 #include "content/common/content_constants_internal.h"
  26 #include "content/public/common/content_switches.h"
  27 #include "content/public/common/main_function_params.h"
  28 #include "content/public/renderer/content_renderer_client.h"
  29 #include "content/renderer/render_process_impl.h"
  30 #include "content/renderer/render_thread_impl.h"
  31 #include "content/renderer/renderer_main_platform_delegate.h"
  32 #include "ui/base/ui_base_switches.h"
  33
  34 #if defined(OS_ANDROID)
  35 #include "third_party/skia/include/core/SkGraphics.h"
  36 #endif  // OS_ANDROID
  37
  38 #if defined(OS_MACOSX)
  39 #include <Carbon/Carbon.h>
  40 #include <signal.h>
  41 #include <unistd.h>
  42
  43 #include "base/mac/mac_util.h"
  44 #include "base/mac/scoped_nsautorelease_pool.h"
  45 #include "base/message_loop/message_pump_mac.h"
  46 #include "third_party/WebKit/public/web/WebView.h"
  47 #endif  // OS_MACOSX
  48
  49 #if defined(ENABLE_PLUGINS)
  50 #include "content/renderer/pepper/pepper_plugin_registry.h"
  51 #endif
  52
  53 #if defined(ENABLE_WEBRTC)
  54 #include "third_party/libjingle/overrides/init_webrtc.h"
  55 #endif
  56
  57 namespace content {
  58 namespace {
  59 // This function provides some ways to test crash and assertion handling
  60 // behavior of the renderer.
  61 static void HandleRendererErrorTestParameters(const CommandLine& command_line) {
  62   if (command_line.HasSwitch(switches::kWaitForDebugger))
  63     base::debug::WaitForDebugger(60, true);
  64
  65   if (command_line.HasSwitch(switches::kRendererStartupDialog))
  66     ChildProcess::WaitForDebugger("Renderer");
  67
  68   // This parameter causes an assertion.
  69   if (command_line.HasSwitch(switches::kRendererAssertTest)) {
  70     DCHECK(false);
  71   }
  72 }
  73
  74 // This is a simplified version of the browser Jankometer, which measures
  75 // the processing time of tasks on the render thread.
  76 class RendererMessageLoopObserver : public base::MessageLoop::TaskObserver {
  77  public:
  78   RendererMessageLoopObserver()
  79       : process_times_(base::Histogram::FactoryGet(
  80             "Chrome.ProcMsgL RenderThread",
  81             1, 3600000, 50, base::Histogram::kUmaTargetedHistogramFlag)) {}
  82   virtual ~RendererMessageLoopObserver() {}
  83
  84   virtual void WillProcessTask(const base::PendingTask& pending_task) override {
  85     begin_process_message_ = base::TimeTicks::Now();
  86   }
  87
  88   virtual void DidProcessTask(const base::PendingTask& pending_task) override {
  89     if (!begin_process_message_.is_null())
  90       process_times_->AddTime(base::TimeTicks::Now() - begin_process_message_);
  91   }
  92
  93  private:
  94   base::TimeTicks begin_process_message_;
  95   base::HistogramBase* const process_times_;
  96   DISALLOW_COPY_AND_ASSIGN(RendererMessageLoopObserver);
  97 };
  98
  99 }  // namespace
 100
 101 // mainline routine for running as the Renderer process
 102 int RendererMain(const MainFunctionParams& parameters) {
 103   TRACE_EVENT_BEGIN_ETW("RendererMain", 0, "");
 104   base::debug::TraceLog::GetInstance()->SetProcessName("Renderer");
 105   base::debug::TraceLog::GetInstance()->SetProcessSortIndex(
 106       kTraceEventRendererProcessSortIndex);
 107
 108   const CommandLine& parsed_command_line = parameters.command_line;
 109
 110 #if defined(OS_MACOSX)
 111   base::mac::ScopedNSAutoreleasePool* pool = parameters.autorelease_pool;
 112 #endif  // OS_MACOSX
 113
 114 #if defined(OS_CHROMEOS)
 115   // As Zygote process starts up earlier than browser process gets its own
 116   // locale (at login time for Chrome OS), we have to set the ICU default
 117   // locale for renderer process here.
 118   // ICU locale will be used for fallback font selection etc.
 119   if (parsed_command_line.HasSwitch(switches::kLang)) {
 120     const std::string locale =
 121         parsed_command_line.GetSwitchValueASCII(switches::kLang);
 122     base::i18n::SetICUDefaultLocale(locale);
 123   }
 124 #endif
 125
 126 #if defined(OS_ANDROID)
 127   const int kMB = 1024 * 1024;
 128   size_t font_cache_limit =
 129       base::SysInfo::IsLowEndDevice() ? kMB : 8 * kMB;
 130   SkGraphics::SetFontCacheLimit(font_cache_limit);
 131 #endif
 132
 133   // This function allows pausing execution using the --renderer-startup-dialog
 134   // flag allowing us to attach a debugger.
 135   // Do not move this function down since that would mean we can't easily debug
 136   // whatever occurs before it.
 137   HandleRendererErrorTestParameters(parsed_command_line);
 138
 139   RendererMainPlatformDelegate platform(parameters);
 140
 141
 142   base::StatsCounterTimer stats_counter_timer("Content.RendererInit");
 143   base::StatsScope<base::StatsCounterTimer> startup_timer(stats_counter_timer);
 144
 145   RendererMessageLoopObserver task_observer;
 146 #if defined(OS_MACOSX)
 147   // As long as scrollbars on Mac are painted with Cocoa, the message pump
 148   // needs to be backed by a Foundation-level loop to process NSTimers. See
 149   // http://crbug.com/306348#c24 for details.
 150   scoped_ptr<base::MessagePump> pump(new base::MessagePumpNSRunLoop());
 151   base::MessageLoop main_message_loop(pump.Pass());
 152 #else
 153   // The main message loop of the renderer services doesn't have IO or UI tasks.
 154   base::MessageLoop main_message_loop;
 155 #endif
 156   main_message_loop.AddTaskObserver(&task_observer);
 157
 158   base::PlatformThread::SetName("CrRendererMain");
 159
 160   bool no_sandbox = parsed_command_line.HasSwitch(switches::kNoSandbox);
 161
 162   // Initialize histogram statistics gathering system.
 163   base::StatisticsRecorder::Initialize();
 164
 165   // Initialize statistical testing infrastructure.  We set the entropy provider
 166   // to NULL to disallow the renderer process from creating its own one-time
 167   // randomized trials; they should be created in the browser process.
 168   base::FieldTrialList field_trial_list(NULL);
 169   // Ensure any field trials in browser are reflected into renderer.
 170   if (parsed_command_line.HasSwitch(switches::kForceFieldTrials)) {
 171     // Field trials are created in an "activated" state to ensure they get
 172     // reported in crash reports.
 173     bool result = base::FieldTrialList::CreateTrialsFromString(
 174         parsed_command_line.GetSwitchValueASCII(switches::kForceFieldTrials),
 175         base::FieldTrialList::ACTIVATE_TRIALS,
 176         std::set<std::string>());
 177     DCHECK(result);
 178   }
 179
 180   // PlatformInitialize uses FieldTrials, so this must happen later.
 181   platform.PlatformInitialize();
 182
 183 #if defined(ENABLE_PLUGINS)
 184   // Load pepper plugins before engaging the sandbox.
 185   PepperPluginRegistry::GetInstance();
 186 #endif
 187 #if defined(ENABLE_WEBRTC)
 188   // Initialize WebRTC before engaging the sandbox.
 189   // NOTE: On linux, this call could already have been made from
 190   // zygote_main_linux.cc.  However, calling multiple times from the same thread
 191   // is OK.
 192   InitializeWebRtcModule();
 193 #endif
 194
 195   {
 196 #if defined(OS_WIN) || defined(OS_MACOSX)
 197     // TODO(markus): Check if it is OK to unconditionally move this
 198     // instruction down.
 199     RenderProcessImpl render_process;
 200     new RenderThreadImpl();
 201 #endif
 202     bool run_loop = true;
 203     if (!no_sandbox) {
 204       run_loop = platform.EnableSandbox();
 205     } else {
 206       LOG(ERROR) << "Running without renderer sandbox";
 207 #ifndef NDEBUG
 208       // For convenience, we print the stack traces for crashes.  When sandbox
 209       // is enabled, the in-process stack dumping is enabled as part of the
 210       // EnableSandbox() call.
 211       base::debug::EnableInProcessStackDumping();
 212 #endif
 213     }
 214 #if defined(OS_POSIX) && !defined(OS_MACOSX)
 215     RenderProcessImpl render_process;
 216     new RenderThreadImpl();
 217 #endif
 218
 219     base::HighResolutionTimerManager hi_res_timer_manager;
 220
 221     startup_timer.Stop();  // End of Startup Time Measurement.
 222
 223     if (run_loop) {
 224 #if defined(OS_MACOSX)
 225       if (pool)
 226         pool->Recycle();
 227 #endif
 228       TRACE_EVENT_BEGIN_ETW("RendererMain.START_MSG_LOOP", 0, 0);
 229       base::MessageLoop::current()->Run();
 230       TRACE_EVENT_END_ETW("RendererMain.START_MSG_LOOP", 0, 0);
 231     }
 232   }
 233   platform.PlatformUninitialize();
 234   TRACE_EVENT_END_ETW("RendererMain", 0, "");
 235   return 0;
 236 }
 237
 238 }  // namespace content