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// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "content/browser/browser_main_runner_impl.h"
#include <memory>
#include "base/allocator/partition_alloc_support.h"
#include "base/base_switches.h"
#include "base/check.h"
#include "base/command_line.h"
#include "base/debug/debugger.h"
#include "base/debug/leak_annotations.h"
#include "base/metrics/histogram_macros.h"
#include "base/no_destructor.h"
#include "base/run_loop.h"
#include "base/synchronization/atomic_flag.h"
#include "base/time/time.h"
#include "base/trace_event/heap_profiler_allocation_context_tracker.h"
#include "base/trace_event/trace_event.h"
#include "build/build_config.h"
#include "components/tracing/common/tracing_switches.h"
#include "content/browser/browser_main_loop.h"
#include "content/browser/tracing/startup_tracing_controller.h"
#include "content/common/content_switches_internal.h"
#include "content/public/common/content_switches.h"
#include "content/public/common/main_function_params.h"
#include "services/tracing/public/cpp/trace_startup_config.h"
#include "third_party/skia/include/core/SkGraphics.h"
#include "ui/base/ime/init/input_method_initializer.h"
#include "ui/gfx/font_util.h"
#if BUILDFLAG(IS_ANDROID)
#include "content/browser/android/tracing_controller_android.h"
#endif
#if BUILDFLAG(IS_WIN)
#include "base/win/win_util.h"
#include "base/win/windows_version.h"
#include "ui/base/win/scoped_ole_initializer.h"
#endif
namespace content {
namespace {
base::AtomicFlag& GetExitedMainMessageLoopFlag() {
static base::NoDestructor<base::AtomicFlag> flag;
return *flag;
}
} // namespace
// static
std::unique_ptr<BrowserMainRunnerImpl> BrowserMainRunnerImpl::Create() {
return std::make_unique<BrowserMainRunnerImpl>();
}
BrowserMainRunnerImpl::BrowserMainRunnerImpl()
: initialization_started_(false),
is_shutdown_(false),
scoped_execution_fence_(
std::make_unique<base::ThreadPoolInstance::ScopedExecutionFence>()) {}
BrowserMainRunnerImpl::~BrowserMainRunnerImpl() {
if (initialization_started_ && !is_shutdown_) {
Shutdown();
}
}
int BrowserMainRunnerImpl::Initialize(MainFunctionParams parameters) {
SCOPED_UMA_HISTOGRAM_LONG_TIMER(
"Startup.BrowserMainRunnerImplInitializeLongTime");
TRACE_EVENT0("startup", "BrowserMainRunnerImpl::Initialize");
// On Android we normally initialize the browser in a series of UI thread
// tasks. While this is happening a second request can come from the OS or
// another application to start the browser. If this happens then we must
// not run these parts of initialization twice.
if (!initialization_started_) {
initialization_started_ = true;
SkGraphics::Init();
if (parameters.command_line->HasSwitch(switches::kWaitForDebugger)) {
base::debug::WaitForDebugger(60, true);
}
if (parameters.command_line->HasSwitch(switches::kBrowserStartupDialog)) {
WaitForDebugger("Browser");
}
#if BUILDFLAG(IS_WIN)
base::win::EnableHighDPISupport();
// Ole must be initialized before starting message pump, so that TSF
// (Text Services Framework) module can interact with the message pump
// on Windows 8 Metro mode.
ole_initializer_ = std::make_unique<ui::ScopedOleInitializer>();
#endif // BUILDFLAG(IS_WIN)
gfx::InitializeFonts();
auto created_main_parts_closure =
std::move(parameters.created_main_parts_closure);
main_loop_ = std::make_unique<BrowserMainLoop>(
std::move(parameters), std::move(scoped_execution_fence_));
main_loop_->Init();
if (created_main_parts_closure) {
std::move(created_main_parts_closure).Run(main_loop_->parts());
}
const int early_init_error_code = main_loop_->EarlyInitialization();
if (early_init_error_code > 0) {
main_loop_->CreateMessageLoopForEarlyShutdown();
return early_init_error_code;
}
// Must happen before we try to use a message loop or display any UI.
if (!main_loop_->InitializeToolkit()) {
main_loop_->CreateMessageLoopForEarlyShutdown();
return 1;
}
main_loop_->PreCreateMainMessageLoop();
main_loop_->CreateMainMessageLoop();
main_loop_->PostCreateMainMessageLoop();
// WARNING: If we get a WM_ENDSESSION, objects created on the stack here
// are NOT deleted. If you need something to run during WM_ENDSESSION add it
// to browser_shutdown::Shutdown or BrowserProcess::EndSession.
ui::InitializeInputMethod();
}
main_loop_->CreateStartupTasks();
int result_code = main_loop_->GetResultCode();
if (result_code > 0) {
return result_code;
}
// Return -1 to indicate no early termination.
return -1;
}
#if BUILDFLAG(IS_ANDROID)
void BrowserMainRunnerImpl::SynchronouslyFlushStartupTasks() {
main_loop_->SynchronouslyFlushStartupTasks();
}
#endif
int BrowserMainRunnerImpl::Run() {
DCHECK(initialization_started_);
DCHECK(!is_shutdown_);
main_loop_->RunMainMessageLoop();
return main_loop_->GetResultCode();
}
void BrowserMainRunnerImpl::Shutdown() {
DCHECK(initialization_started_);
DCHECK(!is_shutdown_);
#if BUILDFLAG(IS_CHROMEOS)
// Reduces shutdown hangs on CrOS.
// Googlers: see go/cros-no-op-free-2024 for the experiment write-up.
base::allocator::MakeFreeNoOp();
#endif
main_loop_->PreShutdown();
// Finalize the startup tracing session if it is still active.
StartupTracingController::GetInstance().ShutdownAndWaitForStopIfNeeded();
{
// The trace event has to stay between profiler creation and destruction.
TRACE_EVENT0("shutdown", "BrowserMainRunner");
GetExitedMainMessageLoopFlag().Set();
main_loop_->ShutdownThreadsAndCleanUp();
ui::ShutdownInputMethod();
#if BUILDFLAG(IS_WIN)
ole_initializer_.reset(NULL);
#endif
main_loop_.reset(nullptr);
is_shutdown_ = true;
}
}
// static
std::unique_ptr<BrowserMainRunner> BrowserMainRunner::Create() {
return BrowserMainRunnerImpl::Create();
}
// static
bool BrowserMainRunner::ExitedMainMessageLoop() {
return GetExitedMainMessageLoopFlag().IsSet();
}
} // namespace content
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