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      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/browser_plugin/browser_plugin_manager_impl.h"
     30 #include "content/renderer/render_process_impl.h"
     31 #include "content/renderer/render_thread_impl.h"
     32 #include "content/renderer/renderer_main_platform_delegate.h"
     33 #include "ui/base/ui_base_switches.h"
     34 
     35 #if defined(OS_ANDROID)
     36 #include "third_party/skia/include/core/SkGraphics.h"
     37 #endif  // OS_ANDROID
     38 
     39 #if defined(OS_MACOSX)
     40 #include <Carbon/Carbon.h>
     41 #include <signal.h>
     42 #include <unistd.h>
     43 
     44 #include "base/mac/mac_util.h"
     45 #include "base/mac/scoped_nsautorelease_pool.h"
     46 #include "base/message_loop/message_pump_mac.h"
     47 #include "third_party/WebKit/public/web/WebView.h"
     48 #endif  // OS_MACOSX
     49 
     50 #if defined(ENABLE_PLUGINS)
     51 #include "content/renderer/pepper/pepper_plugin_registry.h"
     52 #endif
     53 
     54 #if defined(ENABLE_WEBRTC)
     55 #include "third_party/libjingle/overrides/init_webrtc.h"
     56 #endif
     57 
     58 namespace content {
     59 namespace {
     60 // This function provides some ways to test crash and assertion handling
     61 // behavior of the renderer.
     62 static void HandleRendererErrorTestParameters(const CommandLine& command_line) {
     63   if (command_line.HasSwitch(switches::kWaitForDebugger))
     64     base::debug::WaitForDebugger(60, true);
     65 
     66   if (command_line.HasSwitch(switches::kRendererStartupDialog))
     67     ChildProcess::WaitForDebugger("Renderer");
     68 
     69   // This parameter causes an assertion.
     70   if (command_line.HasSwitch(switches::kRendererAssertTest)) {
     71     DCHECK(false);
     72   }
     73 }
     74 
     75 // This is a simplified version of the browser Jankometer, which measures
     76 // the processing time of tasks on the render thread.
     77 class RendererMessageLoopObserver : public base::MessageLoop::TaskObserver {
     78  public:
     79   RendererMessageLoopObserver()
     80       : process_times_(base::Histogram::FactoryGet(
     81             "Chrome.ProcMsgL RenderThread",
     82             1, 3600000, 50, base::Histogram::kUmaTargetedHistogramFlag)) {}
     83   virtual ~RendererMessageLoopObserver() {}
     84 
     85   virtual void WillProcessTask(const base::PendingTask& pending_task) OVERRIDE {
     86     begin_process_message_ = base::TimeTicks::Now();
     87   }
     88 
     89   virtual void DidProcessTask(const base::PendingTask& pending_task) OVERRIDE {
     90     if (!begin_process_message_.is_null())
     91       process_times_->AddTime(base::TimeTicks::Now() - begin_process_message_);
     92   }
     93 
     94  private:
     95   base::TimeTicks begin_process_message_;
     96   base::HistogramBase* const process_times_;
     97   DISALLOW_COPY_AND_ASSIGN(RendererMessageLoopObserver);
     98 };
     99 
    100 }  // namespace
    101 
    102 // mainline routine for running as the Renderer process
    103 int RendererMain(const MainFunctionParams& parameters) {
    104   TRACE_EVENT_BEGIN_ETW("RendererMain", 0, "");
    105   base::debug::TraceLog::GetInstance()->SetProcessName("Renderer");
    106   base::debug::TraceLog::GetInstance()->SetProcessSortIndex(
    107       kTraceEventRendererProcessSortIndex);
    108 
    109   const CommandLine& parsed_command_line = parameters.command_line;
    110 
    111 #if defined(OS_MACOSX)
    112   base::mac::ScopedNSAutoreleasePool* pool = parameters.autorelease_pool;
    113 #endif  // OS_MACOSX
    114 
    115 #if defined(OS_CHROMEOS)
    116   // As Zygote process starts up earlier than browser process gets its own
    117   // locale (at login time for Chrome OS), we have to set the ICU default
    118   // locale for renderer process here.
    119   // ICU locale will be used for fallback font selection etc.
    120   if (parsed_command_line.HasSwitch(switches::kLang)) {
    121     const std::string locale =
    122         parsed_command_line.GetSwitchValueASCII(switches::kLang);
    123     base::i18n::SetICUDefaultLocale(locale);
    124   }
    125 #endif
    126 
    127 #if defined(OS_ANDROID)
    128   const int kMB = 1024 * 1024;
    129   size_t font_cache_limit =
    130       base::SysInfo::IsLowEndDevice() ? kMB : 8 * kMB;
    131   SkGraphics::SetFontCacheLimit(font_cache_limit);
    132 #endif
    133 
    134   // This function allows pausing execution using the --renderer-startup-dialog
    135   // flag allowing us to attach a debugger.
    136   // Do not move this function down since that would mean we can't easily debug
    137   // whatever occurs before it.
    138   HandleRendererErrorTestParameters(parsed_command_line);
    139 
    140   RendererMainPlatformDelegate platform(parameters);
    141 
    142 
    143   base::StatsCounterTimer stats_counter_timer("Content.RendererInit");
    144   base::StatsScope<base::StatsCounterTimer> startup_timer(stats_counter_timer);
    145 
    146   RendererMessageLoopObserver task_observer;
    147 #if defined(OS_MACOSX)
    148   // As long as scrollbars on Mac are painted with Cocoa, the message pump
    149   // needs to be backed by a Foundation-level loop to process NSTimers. See
    150   // http://crbug.com/306348#c24 for details.
    151   scoped_ptr<base::MessagePump> pump(new base::MessagePumpNSRunLoop());
    152   base::MessageLoop main_message_loop(pump.Pass());
    153 #else
    154   // The main message loop of the renderer services doesn't have IO or UI tasks.
    155   base::MessageLoop main_message_loop;
    156 #endif
    157   main_message_loop.AddTaskObserver(&task_observer);
    158 
    159   base::PlatformThread::SetName("CrRendererMain");
    160 
    161   bool no_sandbox = parsed_command_line.HasSwitch(switches::kNoSandbox);
    162 
    163   // Initialize histogram statistics gathering system.
    164   base::StatisticsRecorder::Initialize();
    165 
    166   // Initialize statistical testing infrastructure.  We set the entropy provider
    167   // to NULL to disallow the renderer process from creating its own one-time
    168   // randomized trials; they should be created in the browser process.
    169   base::FieldTrialList field_trial_list(NULL);
    170   // Ensure any field trials in browser are reflected into renderer.
    171   if (parsed_command_line.HasSwitch(switches::kForceFieldTrials)) {
    172     // Field trials are created in an "activated" state to ensure they get
    173     // reported in crash reports.
    174     bool result = base::FieldTrialList::CreateTrialsFromString(
    175         parsed_command_line.GetSwitchValueASCII(switches::kForceFieldTrials),
    176         base::FieldTrialList::ACTIVATE_TRIALS,
    177         std::set<std::string>());
    178     DCHECK(result);
    179   }
    180 
    181   // PlatformInitialize uses FieldTrials, so this must happen later.
    182   platform.PlatformInitialize();
    183 
    184 #if defined(ENABLE_PLUGINS)
    185   // Load pepper plugins before engaging the sandbox.
    186   PepperPluginRegistry::GetInstance();
    187 #endif
    188 #if defined(ENABLE_WEBRTC)
    189   // Initialize WebRTC before engaging the sandbox.
    190   // NOTE: On linux, this call could already have been made from
    191   // zygote_main_linux.cc.  However, calling multiple times from the same thread
    192   // is OK.
    193   InitializeWebRtcModule();
    194 #endif
    195 
    196   {
    197 #if defined(OS_WIN) || defined(OS_MACOSX)
    198     // TODO(markus): Check if it is OK to unconditionally move this
    199     // instruction down.
    200     RenderProcessImpl render_process;
    201     new RenderThreadImpl();
    202 #endif
    203     bool run_loop = true;
    204     if (!no_sandbox) {
    205       run_loop = platform.EnableSandbox();
    206     } else {
    207       LOG(ERROR) << "Running without renderer sandbox";
    208 #ifndef NDEBUG
    209       // For convenience, we print the stack traces for crashes.  When sandbox
    210       // is enabled, the in-process stack dumping is enabled as part of the
    211       // EnableSandbox() call.
    212       base::debug::EnableInProcessStackDumping();
    213 #endif
    214     }
    215 #if defined(OS_POSIX) && !defined(OS_MACOSX)
    216     RenderProcessImpl render_process;
    217     new RenderThreadImpl();
    218 #endif
    219 
    220     base::HighResolutionTimerManager hi_res_timer_manager;
    221 
    222     startup_timer.Stop();  // End of Startup Time Measurement.
    223 
    224     if (run_loop) {
    225 #if defined(OS_MACOSX)
    226       if (pool)
    227         pool->Recycle();
    228 #endif
    229       TRACE_EVENT_BEGIN_ETW("RendererMain.START_MSG_LOOP", 0, 0);
    230       base::MessageLoop::current()->Run();
    231       TRACE_EVENT_END_ETW("RendererMain.START_MSG_LOOP", 0, 0);
    232     }
    233   }
    234   platform.PlatformUninitialize();
    235   TRACE_EVENT_END_ETW("RendererMain", 0, "");
    236   return 0;
    237 }
    238 
    239 }  // namespace content
    240