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// Copyright 2015 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 "base/trace_event/trace_log.h"
#include <algorithm>
#include <cmath>
#include <memory>
#include <utility>
#include "base/base_switches.h"
#include "base/bind.h"
#include "base/command_line.h"
#include "base/debug/leak_annotations.h"
#include "base/location.h"
#include "base/macros.h"
#include "base/memory/ptr_util.h"
#include "base/memory/ref_counted_memory.h"
#include "base/message_loop/message_loop.h"
#include "base/message_loop/message_loop_current.h"
#include "base/no_destructor.h"
#include "base/process/process_info.h"
#include "base/process/process_metrics.h"
#include "base/stl_util.h"
#include "base/strings/string_piece.h"
#include "base/strings/string_split.h"
#include "base/strings/string_tokenizer.h"
#include "base/strings/stringprintf.h"
#include "base/sys_info.h"
#include "base/task_scheduler/post_task.h"
#include "base/threading/platform_thread.h"
#include "base/threading/thread_id_name_manager.h"
#include "base/threading/thread_task_runner_handle.h"
#include "base/time/time.h"
#include "base/trace_event/category_registry.h"
#include "base/trace_event/event_name_filter.h"
#include "base/trace_event/heap_profiler.h"
#include "base/trace_event/heap_profiler_allocation_context_tracker.h"
#include "base/trace_event/heap_profiler_event_filter.h"
#include "base/trace_event/memory_dump_manager.h"
#include "base/trace_event/memory_dump_provider.h"
#include "base/trace_event/process_memory_dump.h"
#include "base/trace_event/trace_buffer.h"
#include "base/trace_event/trace_event.h"
#include "build/build_config.h"
#if defined(OS_WIN)
#include "base/trace_event/trace_event_etw_export_win.h"
#endif
#if defined(OS_ANDROID)
// The linker assigns the virtual address of the start of current library to
// this symbol.
extern char __executable_start;
#endif
namespace base {
namespace trace_event {
namespace {
// Controls the number of trace events we will buffer in-memory
// before throwing them away.
const size_t kTraceBufferChunkSize = TraceBufferChunk::kTraceBufferChunkSize;
const size_t kTraceEventVectorBigBufferChunks =
512000000 / kTraceBufferChunkSize;
static_assert(
kTraceEventVectorBigBufferChunks <= TraceBufferChunk::kMaxChunkIndex,
"Too many big buffer chunks");
const size_t kTraceEventVectorBufferChunks = 256000 / kTraceBufferChunkSize;
static_assert(
kTraceEventVectorBufferChunks <= TraceBufferChunk::kMaxChunkIndex,
"Too many vector buffer chunks");
const size_t kTraceEventRingBufferChunks = kTraceEventVectorBufferChunks / 4;
// ECHO_TO_CONSOLE needs a small buffer to hold the unfinished COMPLETE events.
const size_t kEchoToConsoleTraceEventBufferChunks = 256;
const size_t kTraceEventBufferSizeInBytes = 100 * 1024;
const int kThreadFlushTimeoutMs = 3000;
TraceLog* g_trace_log_for_testing = nullptr;
#define MAX_TRACE_EVENT_FILTERS 32
// List of TraceEventFilter objects from the most recent tracing session.
std::vector<std::unique_ptr<TraceEventFilter>>& GetCategoryGroupFilters() {
static auto* filters = new std::vector<std::unique_ptr<TraceEventFilter>>();
return *filters;
}
ThreadTicks ThreadNow() {
return ThreadTicks::IsSupported()
? base::subtle::ThreadTicksNowIgnoringOverride()
: ThreadTicks();
}
template <typename T>
void InitializeMetadataEvent(TraceEvent* trace_event,
int thread_id,
const char* metadata_name,
const char* arg_name,
const T& value) {
if (!trace_event)
return;
int num_args = 1;
unsigned char arg_type;
unsigned long long arg_value;
::trace_event_internal::SetTraceValue(value, &arg_type, &arg_value);
trace_event->Initialize(
thread_id,
TimeTicks(),
ThreadTicks(),
TRACE_EVENT_PHASE_METADATA,
CategoryRegistry::kCategoryMetadata->state_ptr(),
metadata_name,
trace_event_internal::kGlobalScope, // scope
trace_event_internal::kNoId, // id
trace_event_internal::kNoId, // bind_id
num_args,
&arg_name,
&arg_type,
&arg_value,
nullptr,
TRACE_EVENT_FLAG_NONE);
}
class AutoThreadLocalBoolean {
public:
explicit AutoThreadLocalBoolean(ThreadLocalBoolean* thread_local_boolean)
: thread_local_boolean_(thread_local_boolean) {
DCHECK(!thread_local_boolean_->Get());
thread_local_boolean_->Set(true);
}
~AutoThreadLocalBoolean() { thread_local_boolean_->Set(false); }
private:
ThreadLocalBoolean* thread_local_boolean_;
DISALLOW_COPY_AND_ASSIGN(AutoThreadLocalBoolean);
};
// Use this function instead of TraceEventHandle constructor to keep the
// overhead of ScopedTracer (trace_event.h) constructor minimum.
void MakeHandle(uint32_t chunk_seq,
size_t chunk_index,
size_t event_index,
TraceEventHandle* handle) {
DCHECK(chunk_seq);
DCHECK(chunk_index <= TraceBufferChunk::kMaxChunkIndex);
DCHECK(event_index < TraceBufferChunk::kTraceBufferChunkSize);
DCHECK(chunk_index <= std::numeric_limits<uint16_t>::max());
handle->chunk_seq = chunk_seq;
handle->chunk_index = static_cast<uint16_t>(chunk_index);
handle->event_index = static_cast<uint16_t>(event_index);
}
template <typename Function>
void ForEachCategoryFilter(const unsigned char* category_group_enabled,
Function filter_fn) {
const TraceCategory* category =
CategoryRegistry::GetCategoryByStatePtr(category_group_enabled);
uint32_t filter_bitmap = category->enabled_filters();
for (int index = 0; filter_bitmap != 0; filter_bitmap >>= 1, index++) {
if (filter_bitmap & 1 && GetCategoryGroupFilters()[index])
filter_fn(GetCategoryGroupFilters()[index].get());
}
}
} // namespace
// A helper class that allows the lock to be acquired in the middle of the scope
// and unlocks at the end of scope if locked.
class TraceLog::OptionalAutoLock {
public:
explicit OptionalAutoLock(Lock* lock) : lock_(lock), locked_(false) {}
~OptionalAutoLock() {
if (locked_)
lock_->Release();
}
void EnsureAcquired() {
if (!locked_) {
lock_->Acquire();
locked_ = true;
}
}
private:
Lock* lock_;
bool locked_;
DISALLOW_COPY_AND_ASSIGN(OptionalAutoLock);
};
class TraceLog::ThreadLocalEventBuffer
: public MessageLoopCurrent::DestructionObserver,
public MemoryDumpProvider {
public:
explicit ThreadLocalEventBuffer(TraceLog* trace_log);
~ThreadLocalEventBuffer() override;
TraceEvent* AddTraceEvent(TraceEventHandle* handle);
TraceEvent* GetEventByHandle(TraceEventHandle handle) {
if (!chunk_ || handle.chunk_seq != chunk_->seq() ||
handle.chunk_index != chunk_index_) {
return nullptr;
}
return chunk_->GetEventAt(handle.event_index);
}
int generation() const { return generation_; }
private:
// MessageLoopCurrent::DestructionObserver
void WillDestroyCurrentMessageLoop() override;
// MemoryDumpProvider implementation.
bool OnMemoryDump(const MemoryDumpArgs& args,
ProcessMemoryDump* pmd) override;
void FlushWhileLocked();
void CheckThisIsCurrentBuffer() const {
DCHECK(trace_log_->thread_local_event_buffer_.Get() == this);
}
// Since TraceLog is a leaky singleton, trace_log_ will always be valid
// as long as the thread exists.
TraceLog* trace_log_;
std::unique_ptr<TraceBufferChunk> chunk_;
size_t chunk_index_;
int generation_;
DISALLOW_COPY_AND_ASSIGN(ThreadLocalEventBuffer);
};
TraceLog::ThreadLocalEventBuffer::ThreadLocalEventBuffer(TraceLog* trace_log)
: trace_log_(trace_log),
chunk_index_(0),
generation_(trace_log->generation()) {
// ThreadLocalEventBuffer is created only if the thread has a message loop, so
// the following message_loop won't be NULL.
MessageLoop* message_loop = MessageLoop::current();
message_loop->AddDestructionObserver(this);
// This is to report the local memory usage when memory-infra is enabled.
MemoryDumpManager::GetInstance()->RegisterDumpProvider(
this, "ThreadLocalEventBuffer", ThreadTaskRunnerHandle::Get());
AutoLock lock(trace_log->lock_);
trace_log->thread_message_loops_.insert(message_loop);
}
TraceLog::ThreadLocalEventBuffer::~ThreadLocalEventBuffer() {
CheckThisIsCurrentBuffer();
MessageLoop::current()->RemoveDestructionObserver(this);
MemoryDumpManager::GetInstance()->UnregisterDumpProvider(this);
{
AutoLock lock(trace_log_->lock_);
FlushWhileLocked();
trace_log_->thread_message_loops_.erase(MessageLoop::current());
}
trace_log_->thread_local_event_buffer_.Set(nullptr);
}
TraceEvent* TraceLog::ThreadLocalEventBuffer::AddTraceEvent(
TraceEventHandle* handle) {
CheckThisIsCurrentBuffer();
if (chunk_ && chunk_->IsFull()) {
AutoLock lock(trace_log_->lock_);
FlushWhileLocked();
chunk_.reset();
}
if (!chunk_) {
AutoLock lock(trace_log_->lock_);
chunk_ = trace_log_->logged_events_->GetChunk(&chunk_index_);
trace_log_->CheckIfBufferIsFullWhileLocked();
}
if (!chunk_)
return nullptr;
size_t event_index;
TraceEvent* trace_event = chunk_->AddTraceEvent(&event_index);
if (trace_event && handle)
MakeHandle(chunk_->seq(), chunk_index_, event_index, handle);
return trace_event;
}
void TraceLog::ThreadLocalEventBuffer::WillDestroyCurrentMessageLoop() {
delete this;
}
bool TraceLog::ThreadLocalEventBuffer::OnMemoryDump(const MemoryDumpArgs& args,
ProcessMemoryDump* pmd) {
if (!chunk_)
return true;
std::string dump_base_name = StringPrintf(
"tracing/thread_%d", static_cast<int>(PlatformThread::CurrentId()));
TraceEventMemoryOverhead overhead;
chunk_->EstimateTraceMemoryOverhead(&overhead);
overhead.DumpInto(dump_base_name.c_str(), pmd);
return true;
}
void TraceLog::ThreadLocalEventBuffer::FlushWhileLocked() {
if (!chunk_)
return;
trace_log_->lock_.AssertAcquired();
if (trace_log_->CheckGeneration(generation_)) {
// Return the chunk to the buffer only if the generation matches.
trace_log_->logged_events_->ReturnChunk(chunk_index_, std::move(chunk_));
}
// Otherwise this method may be called from the destructor, or TraceLog will
// find the generation mismatch and delete this buffer soon.
}
void TraceLog::SetAddTraceEventOverride(
const AddTraceEventOverrideCallback& override) {
subtle::NoBarrier_Store(&trace_event_override_,
reinterpret_cast<subtle::AtomicWord>(override));
}
struct TraceLog::RegisteredAsyncObserver {
explicit RegisteredAsyncObserver(WeakPtr<AsyncEnabledStateObserver> observer)
: observer(observer), task_runner(ThreadTaskRunnerHandle::Get()) {}
~RegisteredAsyncObserver() = default;
WeakPtr<AsyncEnabledStateObserver> observer;
scoped_refptr<SequencedTaskRunner> task_runner;
};
TraceLogStatus::TraceLogStatus() : event_capacity(0), event_count(0) {}
TraceLogStatus::~TraceLogStatus() = default;
// static
TraceLog* TraceLog::GetInstance() {
static base::NoDestructor<TraceLog> instance;
return instance.get();
}
// static
void TraceLog::ResetForTesting() {
if (!g_trace_log_for_testing)
return;
CategoryRegistry::ResetForTesting();
g_trace_log_for_testing->~TraceLog();
new (g_trace_log_for_testing) TraceLog;
}
TraceLog::TraceLog()
: enabled_modes_(0),
num_traces_recorded_(0),
dispatching_to_observer_list_(false),
process_sort_index_(0),
process_id_hash_(0),
process_id_(0),
trace_options_(kInternalRecordUntilFull),
trace_config_(TraceConfig()),
thread_shared_chunk_index_(0),
generation_(0),
use_worker_thread_(false),
trace_event_override_(0),
filter_factory_for_testing_(nullptr) {
CategoryRegistry::Initialize();
#if defined(OS_NACL) // NaCl shouldn't expose the process id.
SetProcessID(0);
#else
SetProcessID(static_cast<int>(GetCurrentProcId()));
#endif
// Linux renderer processes and Android O processes are not allowed to read
// "proc/stat" file, crbug.com/788870.
#if defined(OS_WIN) || (defined(OS_MACOSX) && !defined(OS_IOS))
process_creation_time_ = CurrentProcessInfo::CreationTime();
#else
// Use approximate time when creation time is not available.
process_creation_time_ = TRACE_TIME_NOW();
#endif
logged_events_.reset(CreateTraceBuffer());
MemoryDumpManager::GetInstance()->RegisterDumpProvider(this, "TraceLog",
nullptr);
g_trace_log_for_testing = this;
}
TraceLog::~TraceLog() = default;
void TraceLog::InitializeThreadLocalEventBufferIfSupported() {
// A ThreadLocalEventBuffer needs the message loop
// - to know when the thread exits;
// - to handle the final flush.
// For a thread without a message loop or the message loop may be blocked, the
// trace events will be added into the main buffer directly.
if (thread_blocks_message_loop_.Get() || !MessageLoopCurrent::IsSet())
return;
HEAP_PROFILER_SCOPED_IGNORE;
auto* thread_local_event_buffer = thread_local_event_buffer_.Get();
if (thread_local_event_buffer &&
!CheckGeneration(thread_local_event_buffer->generation())) {
delete thread_local_event_buffer;
thread_local_event_buffer = nullptr;
}
if (!thread_local_event_buffer) {
thread_local_event_buffer = new ThreadLocalEventBuffer(this);
thread_local_event_buffer_.Set(thread_local_event_buffer);
}
}
bool TraceLog::OnMemoryDump(const MemoryDumpArgs& args,
ProcessMemoryDump* pmd) {
// TODO(ssid): Use MemoryDumpArgs to create light dumps when requested
// (crbug.com/499731).
TraceEventMemoryOverhead overhead;
overhead.Add(TraceEventMemoryOverhead::kOther, sizeof(*this));
{
AutoLock lock(lock_);
if (logged_events_)
logged_events_->EstimateTraceMemoryOverhead(&overhead);
for (auto& metadata_event : metadata_events_)
metadata_event->EstimateTraceMemoryOverhead(&overhead);
}
overhead.AddSelf();
overhead.DumpInto("tracing/main_trace_log", pmd);
return true;
}
const unsigned char* TraceLog::GetCategoryGroupEnabled(
const char* category_group) {
TraceLog* tracelog = GetInstance();
if (!tracelog) {
DCHECK(!CategoryRegistry::kCategoryAlreadyShutdown->is_enabled());
return CategoryRegistry::kCategoryAlreadyShutdown->state_ptr();
}
TraceCategory* category = CategoryRegistry::GetCategoryByName(category_group);
if (!category) {
// Slow path: in the case of a new category we have to repeat the check
// holding the lock, as multiple threads might have reached this point
// at the same time.
auto category_initializer = [](TraceCategory* category) {
TraceLog::GetInstance()->UpdateCategoryState(category);
};
AutoLock lock(tracelog->lock_);
CategoryRegistry::GetOrCreateCategoryLocked(
category_group, category_initializer, &category);
}
DCHECK(category->state_ptr());
return category->state_ptr();
}
const char* TraceLog::GetCategoryGroupName(
const unsigned char* category_group_enabled) {
return CategoryRegistry::GetCategoryByStatePtr(category_group_enabled)
->name();
}
void TraceLog::UpdateCategoryState(TraceCategory* category) {
lock_.AssertAcquired();
DCHECK(category->is_valid());
unsigned char state_flags = 0;
if (enabled_modes_ & RECORDING_MODE &&
trace_config_.IsCategoryGroupEnabled(category->name())) {
state_flags |= TraceCategory::ENABLED_FOR_RECORDING;
}
// TODO(primiano): this is a temporary workaround for catapult:#2341,
// to guarantee that metadata events are always added even if the category
// filter is "-*". See crbug.com/618054 for more details and long-term fix.
if (enabled_modes_ & RECORDING_MODE &&
category == CategoryRegistry::kCategoryMetadata) {
state_flags |= TraceCategory::ENABLED_FOR_RECORDING;
}
#if defined(OS_WIN)
if (base::trace_event::TraceEventETWExport::IsCategoryGroupEnabled(
category->name())) {
state_flags |= TraceCategory::ENABLED_FOR_ETW_EXPORT;
}
#endif
uint32_t enabled_filters_bitmap = 0;
int index = 0;
for (const auto& event_filter : enabled_event_filters_) {
if (event_filter.IsCategoryGroupEnabled(category->name())) {
state_flags |= TraceCategory::ENABLED_FOR_FILTERING;
DCHECK(GetCategoryGroupFilters()[index]);
enabled_filters_bitmap |= 1 << index;
}
if (index++ >= MAX_TRACE_EVENT_FILTERS) {
NOTREACHED();
break;
}
}
category->set_enabled_filters(enabled_filters_bitmap);
category->set_state(state_flags);
}
void TraceLog::UpdateCategoryRegistry() {
lock_.AssertAcquired();
CreateFiltersForTraceConfig();
for (TraceCategory& category : CategoryRegistry::GetAllCategories()) {
UpdateCategoryState(&category);
}
}
void TraceLog::CreateFiltersForTraceConfig() {
if (!(enabled_modes_ & FILTERING_MODE))
return;
// Filters were already added and tracing could be enabled. Filters list
// cannot be changed when trace events are using them.
if (GetCategoryGroupFilters().size())
return;
for (auto& filter_config : enabled_event_filters_) {
if (GetCategoryGroupFilters().size() >= MAX_TRACE_EVENT_FILTERS) {
NOTREACHED()
<< "Too many trace event filters installed in the current session";
break;
}
std::unique_ptr<TraceEventFilter> new_filter;
const std::string& predicate_name = filter_config.predicate_name();
if (predicate_name == EventNameFilter::kName) {
auto whitelist = std::make_unique<std::unordered_set<std::string>>();
CHECK(filter_config.GetArgAsSet("event_name_whitelist", &*whitelist));
new_filter = std::make_unique<EventNameFilter>(std::move(whitelist));
} else if (predicate_name == HeapProfilerEventFilter::kName) {
new_filter = std::make_unique<HeapProfilerEventFilter>();
} else {
if (filter_factory_for_testing_)
new_filter = filter_factory_for_testing_(predicate_name);
CHECK(new_filter) << "Unknown trace filter " << predicate_name;
}
GetCategoryGroupFilters().push_back(std::move(new_filter));
}
}
void TraceLog::GetKnownCategoryGroups(
std::vector<std::string>* category_groups) {
for (const auto& category : CategoryRegistry::GetAllCategories()) {
if (!CategoryRegistry::IsBuiltinCategory(&category))
category_groups->push_back(category.name());
}
}
void TraceLog::SetEnabled(const TraceConfig& trace_config,
uint8_t modes_to_enable) {
std::vector<EnabledStateObserver*> observer_list;
std::map<AsyncEnabledStateObserver*, RegisteredAsyncObserver> observer_map;
{
AutoLock lock(lock_);
// Can't enable tracing when Flush() is in progress.
DCHECK(!flush_task_runner_);
InternalTraceOptions new_options =
GetInternalOptionsFromTraceConfig(trace_config);
InternalTraceOptions old_options = trace_options();
if (dispatching_to_observer_list_) {
// TODO(ssid): Change to NOTREACHED after fixing crbug.com/625170.
DLOG(ERROR)
<< "Cannot manipulate TraceLog::Enabled state from an observer.";
return;
}
// Clear all filters from previous tracing session. These filters are not
// cleared at the end of tracing because some threads which hit trace event
// when disabling, could try to use the filters.
if (!enabled_modes_)
GetCategoryGroupFilters().clear();
// Update trace config for recording.
const bool already_recording = enabled_modes_ & RECORDING_MODE;
if (modes_to_enable & RECORDING_MODE) {
if (already_recording) {
// TODO(ssid): Stop suporting enabling of RECODING_MODE when already
// enabled crbug.com/625170.
DCHECK_EQ(new_options, old_options) << "Attempting to re-enable "
"tracing with a different set "
"of options.";
trace_config_.Merge(trace_config);
} else {
trace_config_ = trace_config;
}
}
// Update event filters only if filtering was not enabled.
if (modes_to_enable & FILTERING_MODE && enabled_event_filters_.empty()) {
DCHECK(!trace_config.event_filters().empty());
enabled_event_filters_ = trace_config.event_filters();
}
// Keep the |trace_config_| updated with only enabled filters in case anyone
// tries to read it using |GetCurrentTraceConfig| (even if filters are
// empty).
trace_config_.SetEventFilters(enabled_event_filters_);
enabled_modes_ |= modes_to_enable;
UpdateCategoryRegistry();
// Do not notify observers or create trace buffer if only enabled for
// filtering or if recording was already enabled.
if (!(modes_to_enable & RECORDING_MODE) || already_recording)
return;
if (new_options != old_options) {
subtle::NoBarrier_Store(&trace_options_, new_options);
UseNextTraceBuffer();
}
num_traces_recorded_++;
UpdateCategoryRegistry();
dispatching_to_observer_list_ = true;
observer_list = enabled_state_observer_list_;
observer_map = async_observers_;
}
// Notify observers outside the lock in case they trigger trace events.
for (EnabledStateObserver* observer : observer_list)
observer->OnTraceLogEnabled();
for (const auto& it : observer_map) {
it.second.task_runner->PostTask(
FROM_HERE, BindOnce(&AsyncEnabledStateObserver::OnTraceLogEnabled,
it.second.observer));
}
{
AutoLock lock(lock_);
dispatching_to_observer_list_ = false;
}
}
void TraceLog::SetArgumentFilterPredicate(
const ArgumentFilterPredicate& argument_filter_predicate) {
AutoLock lock(lock_);
DCHECK(!argument_filter_predicate.is_null());
DCHECK(argument_filter_predicate_.is_null());
argument_filter_predicate_ = argument_filter_predicate;
}
TraceLog::InternalTraceOptions TraceLog::GetInternalOptionsFromTraceConfig(
const TraceConfig& config) {
InternalTraceOptions ret = config.IsArgumentFilterEnabled()
? kInternalEnableArgumentFilter
: kInternalNone;
switch (config.GetTraceRecordMode()) {
case RECORD_UNTIL_FULL:
return ret | kInternalRecordUntilFull;
case RECORD_CONTINUOUSLY:
return ret | kInternalRecordContinuously;
case ECHO_TO_CONSOLE:
return ret | kInternalEchoToConsole;
case RECORD_AS_MUCH_AS_POSSIBLE:
return ret | kInternalRecordAsMuchAsPossible;
}
NOTREACHED();
return kInternalNone;
}
TraceConfig TraceLog::GetCurrentTraceConfig() const {
AutoLock lock(lock_);
return trace_config_;
}
void TraceLog::SetDisabled() {
AutoLock lock(lock_);
SetDisabledWhileLocked(RECORDING_MODE);
}
void TraceLog::SetDisabled(uint8_t modes_to_disable) {
AutoLock lock(lock_);
SetDisabledWhileLocked(modes_to_disable);
}
void TraceLog::SetDisabledWhileLocked(uint8_t modes_to_disable) {
lock_.AssertAcquired();
if (!(enabled_modes_ & modes_to_disable))
return;
if (dispatching_to_observer_list_) {
// TODO(ssid): Change to NOTREACHED after fixing crbug.com/625170.
DLOG(ERROR)
<< "Cannot manipulate TraceLog::Enabled state from an observer.";
return;
}
bool is_recording_mode_disabled =
(enabled_modes_ & RECORDING_MODE) && (modes_to_disable & RECORDING_MODE);
enabled_modes_ &= ~modes_to_disable;
if (modes_to_disable & FILTERING_MODE)
enabled_event_filters_.clear();
if (modes_to_disable & RECORDING_MODE)
trace_config_.Clear();
UpdateCategoryRegistry();
// Add metadata events and notify observers only if recording mode was
// disabled now.
if (!is_recording_mode_disabled)
return;
AddMetadataEventsWhileLocked();
// Remove metadata events so they will not get added to a subsequent trace.
metadata_events_.clear();
dispatching_to_observer_list_ = true;
std::vector<EnabledStateObserver*> observer_list =
enabled_state_observer_list_;
std::map<AsyncEnabledStateObserver*, RegisteredAsyncObserver> observer_map =
async_observers_;
{
// Dispatch to observers outside the lock in case the observer triggers a
// trace event.
AutoUnlock unlock(lock_);
for (EnabledStateObserver* observer : observer_list)
observer->OnTraceLogDisabled();
for (const auto& it : observer_map) {
it.second.task_runner->PostTask(
FROM_HERE, BindOnce(&AsyncEnabledStateObserver::OnTraceLogDisabled,
it.second.observer));
}
}
dispatching_to_observer_list_ = false;
}
int TraceLog::GetNumTracesRecorded() {
AutoLock lock(lock_);
if (!IsEnabled())
return -1;
return num_traces_recorded_;
}
void TraceLog::AddEnabledStateObserver(EnabledStateObserver* listener) {
AutoLock lock(lock_);
enabled_state_observer_list_.push_back(listener);
}
void TraceLog::RemoveEnabledStateObserver(EnabledStateObserver* listener) {
AutoLock lock(lock_);
std::vector<EnabledStateObserver*>::iterator it =
std::find(enabled_state_observer_list_.begin(),
enabled_state_observer_list_.end(), listener);
if (it != enabled_state_observer_list_.end())
enabled_state_observer_list_.erase(it);
}
bool TraceLog::HasEnabledStateObserver(EnabledStateObserver* listener) const {
AutoLock lock(lock_);
return ContainsValue(enabled_state_observer_list_, listener);
}
TraceLogStatus TraceLog::GetStatus() const {
AutoLock lock(lock_);
TraceLogStatus result;
result.event_capacity = static_cast<uint32_t>(logged_events_->Capacity());
result.event_count = static_cast<uint32_t>(logged_events_->Size());
return result;
}
bool TraceLog::BufferIsFull() const {
AutoLock lock(lock_);
return logged_events_->IsFull();
}
TraceEvent* TraceLog::AddEventToThreadSharedChunkWhileLocked(
TraceEventHandle* handle,
bool check_buffer_is_full) {
lock_.AssertAcquired();
if (thread_shared_chunk_ && thread_shared_chunk_->IsFull()) {
logged_events_->ReturnChunk(thread_shared_chunk_index_,
std::move(thread_shared_chunk_));
}
if (!thread_shared_chunk_) {
thread_shared_chunk_ =
logged_events_->GetChunk(&thread_shared_chunk_index_);
if (check_buffer_is_full)
CheckIfBufferIsFullWhileLocked();
}
if (!thread_shared_chunk_)
return nullptr;
size_t event_index;
TraceEvent* trace_event = thread_shared_chunk_->AddTraceEvent(&event_index);
if (trace_event && handle) {
MakeHandle(thread_shared_chunk_->seq(), thread_shared_chunk_index_,
event_index, handle);
}
return trace_event;
}
void TraceLog::CheckIfBufferIsFullWhileLocked() {
lock_.AssertAcquired();
if (logged_events_->IsFull()) {
if (buffer_limit_reached_timestamp_.is_null()) {
buffer_limit_reached_timestamp_ = OffsetNow();
}
SetDisabledWhileLocked(RECORDING_MODE);
}
}
// Flush() works as the following:
// 1. Flush() is called in thread A whose task runner is saved in
// flush_task_runner_;
// 2. If thread_message_loops_ is not empty, thread A posts task to each message
// loop to flush the thread local buffers; otherwise finish the flush;
// 3. FlushCurrentThread() deletes the thread local event buffer:
// - The last batch of events of the thread are flushed into the main buffer;
// - The message loop will be removed from thread_message_loops_;
// If this is the last message loop, finish the flush;
// 4. If any thread hasn't finish its flush in time, finish the flush.
void TraceLog::Flush(const TraceLog::OutputCallback& cb,
bool use_worker_thread) {
FlushInternal(cb, use_worker_thread, false);
}
void TraceLog::CancelTracing(const OutputCallback& cb) {
SetDisabled();
FlushInternal(cb, false, true);
}
void TraceLog::FlushInternal(const TraceLog::OutputCallback& cb,
bool use_worker_thread,
bool discard_events) {
use_worker_thread_ = use_worker_thread;
if (IsEnabled()) {
// Can't flush when tracing is enabled because otherwise PostTask would
// - generate more trace events;
// - deschedule the calling thread on some platforms causing inaccurate
// timing of the trace events.
scoped_refptr<RefCountedString> empty_result = new RefCountedString;
if (!cb.is_null())
cb.Run(empty_result, false);
LOG(WARNING) << "Ignored TraceLog::Flush called when tracing is enabled";
return;
}
int gen = generation();
// Copy of thread_message_loops_ to be used without locking.
std::vector<scoped_refptr<SingleThreadTaskRunner>>
thread_message_loop_task_runners;
{
AutoLock lock(lock_);
DCHECK(!flush_task_runner_);
flush_task_runner_ = ThreadTaskRunnerHandle::IsSet()
? ThreadTaskRunnerHandle::Get()
: nullptr;
DCHECK(thread_message_loops_.empty() || flush_task_runner_);
flush_output_callback_ = cb;
if (thread_shared_chunk_) {
logged_events_->ReturnChunk(thread_shared_chunk_index_,
std::move(thread_shared_chunk_));
}
for (MessageLoop* loop : thread_message_loops_)
thread_message_loop_task_runners.push_back(loop->task_runner());
}
if (!thread_message_loop_task_runners.empty()) {
for (auto& task_runner : thread_message_loop_task_runners) {
task_runner->PostTask(
FROM_HERE, BindOnce(&TraceLog::FlushCurrentThread, Unretained(this),
gen, discard_events));
}
flush_task_runner_->PostDelayedTask(
FROM_HERE,
BindOnce(&TraceLog::OnFlushTimeout, Unretained(this), gen,
discard_events),
TimeDelta::FromMilliseconds(kThreadFlushTimeoutMs));
return;
}
FinishFlush(gen, discard_events);
}
// Usually it runs on a different thread.
void TraceLog::ConvertTraceEventsToTraceFormat(
std::unique_ptr<TraceBuffer> logged_events,
const OutputCallback& flush_output_callback,
const ArgumentFilterPredicate& argument_filter_predicate) {
if (flush_output_callback.is_null())
return;
HEAP_PROFILER_SCOPED_IGNORE;
// The callback need to be called at least once even if there is no events
// to let the caller know the completion of flush.
scoped_refptr<RefCountedString> json_events_str_ptr = new RefCountedString();
const size_t kReserveCapacity = kTraceEventBufferSizeInBytes * 5 / 4;
json_events_str_ptr->data().reserve(kReserveCapacity);
while (const TraceBufferChunk* chunk = logged_events->NextChunk()) {
for (size_t j = 0; j < chunk->size(); ++j) {
size_t size = json_events_str_ptr->size();
if (size > kTraceEventBufferSizeInBytes) {
flush_output_callback.Run(json_events_str_ptr, true);
json_events_str_ptr = new RefCountedString();
json_events_str_ptr->data().reserve(kReserveCapacity);
} else if (size) {
json_events_str_ptr->data().append(",\n");
}
chunk->GetEventAt(j)->AppendAsJSON(&(json_events_str_ptr->data()),
argument_filter_predicate);
}
}
flush_output_callback.Run(json_events_str_ptr, false);
}
void TraceLog::FinishFlush(int generation, bool discard_events) {
std::unique_ptr<TraceBuffer> previous_logged_events;
OutputCallback flush_output_callback;
ArgumentFilterPredicate argument_filter_predicate;
if (!CheckGeneration(generation))
return;
{
AutoLock lock(lock_);
previous_logged_events.swap(logged_events_);
UseNextTraceBuffer();
thread_message_loops_.clear();
flush_task_runner_ = nullptr;
flush_output_callback = flush_output_callback_;
flush_output_callback_.Reset();
if (trace_options() & kInternalEnableArgumentFilter) {
CHECK(!argument_filter_predicate_.is_null());
argument_filter_predicate = argument_filter_predicate_;
}
}
if (discard_events) {
if (!flush_output_callback.is_null()) {
scoped_refptr<RefCountedString> empty_result = new RefCountedString;
flush_output_callback.Run(empty_result, false);
}
return;
}
if (use_worker_thread_) {
base::PostTaskWithTraits(
FROM_HERE,
{MayBlock(), TaskPriority::BACKGROUND,
TaskShutdownBehavior::CONTINUE_ON_SHUTDOWN},
BindOnce(&TraceLog::ConvertTraceEventsToTraceFormat,
std::move(previous_logged_events), flush_output_callback,
argument_filter_predicate));
return;
}
ConvertTraceEventsToTraceFormat(std::move(previous_logged_events),
flush_output_callback,
argument_filter_predicate);
}
// Run in each thread holding a local event buffer.
void TraceLog::FlushCurrentThread(int generation, bool discard_events) {
{
AutoLock lock(lock_);
if (!CheckGeneration(generation) || !flush_task_runner_) {
// This is late. The corresponding flush has finished.
return;
}
}
// This will flush the thread local buffer.
delete thread_local_event_buffer_.Get();
// Scheduler uses TRACE_EVENT macros when posting a task, which can lead
// to acquiring a tracing lock. Given that posting a task requires grabbing
// a scheduler lock, we need to post this task outside tracing lock to avoid
// deadlocks.
scoped_refptr<SingleThreadTaskRunner> cached_flush_task_runner;
{
AutoLock lock(lock_);
cached_flush_task_runner = flush_task_runner_;
if (!CheckGeneration(generation) || !flush_task_runner_ ||
!thread_message_loops_.empty())
return;
}
cached_flush_task_runner->PostTask(
FROM_HERE, BindOnce(&TraceLog::FinishFlush, Unretained(this), generation,
discard_events));
}
void TraceLog::OnFlushTimeout(int generation, bool discard_events) {
{
AutoLock lock(lock_);
if (!CheckGeneration(generation) || !flush_task_runner_) {
// Flush has finished before timeout.
return;
}
LOG(WARNING)
<< "The following threads haven't finished flush in time. "
"If this happens stably for some thread, please call "
"TraceLog::GetInstance()->SetCurrentThreadBlocksMessageLoop() from "
"the thread to avoid its trace events from being lost.";
for (hash_set<MessageLoop*>::const_iterator it =
thread_message_loops_.begin();
it != thread_message_loops_.end(); ++it) {
LOG(WARNING) << "Thread: " << (*it)->GetThreadName();
}
}
FinishFlush(generation, discard_events);
}
void TraceLog::UseNextTraceBuffer() {
logged_events_.reset(CreateTraceBuffer());
subtle::NoBarrier_AtomicIncrement(&generation_, 1);
thread_shared_chunk_.reset();
thread_shared_chunk_index_ = 0;
}
TraceEventHandle TraceLog::AddTraceEvent(
char phase,
const unsigned char* category_group_enabled,
const char* name,
const char* scope,
unsigned long long id,
int num_args,
const char* const* arg_names,
const unsigned char* arg_types,
const unsigned long long* arg_values,
std::unique_ptr<ConvertableToTraceFormat>* convertable_values,
unsigned int flags) {
int thread_id = static_cast<int>(base::PlatformThread::CurrentId());
base::TimeTicks now = TRACE_TIME_TICKS_NOW();
return AddTraceEventWithThreadIdAndTimestamp(
phase,
category_group_enabled,
name,
scope,
id,
trace_event_internal::kNoId, // bind_id
thread_id,
now,
num_args,
arg_names,
arg_types,
arg_values,
convertable_values,
flags);
}
TraceEventHandle TraceLog::AddTraceEventWithBindId(
char phase,
const unsigned char* category_group_enabled,
const char* name,
const char* scope,
unsigned long long id,
unsigned long long bind_id,
int num_args,
const char* const* arg_names,
const unsigned char* arg_types,
const unsigned long long* arg_values,
std::unique_ptr<ConvertableToTraceFormat>* convertable_values,
unsigned int flags) {
int thread_id = static_cast<int>(base::PlatformThread::CurrentId());
base::TimeTicks now = TRACE_TIME_TICKS_NOW();
return AddTraceEventWithThreadIdAndTimestamp(
phase,
category_group_enabled,
name,
scope,
id,
bind_id,
thread_id,
now,
num_args,
arg_names,
arg_types,
arg_values,
convertable_values,
flags | TRACE_EVENT_FLAG_HAS_CONTEXT_ID);
}
TraceEventHandle TraceLog::AddTraceEventWithProcessId(
char phase,
const unsigned char* category_group_enabled,
const char* name,
const char* scope,
unsigned long long id,
int process_id,
int num_args,
const char* const* arg_names,
const unsigned char* arg_types,
const unsigned long long* arg_values,
std::unique_ptr<ConvertableToTraceFormat>* convertable_values,
unsigned int flags) {
base::TimeTicks now = TRACE_TIME_TICKS_NOW();
return AddTraceEventWithThreadIdAndTimestamp(
phase,
category_group_enabled,
name,
scope,
id,
trace_event_internal::kNoId, // bind_id
process_id,
now,
num_args,
arg_names,
arg_types,
arg_values,
convertable_values,
flags | TRACE_EVENT_FLAG_HAS_PROCESS_ID);
}
// Handle legacy calls to AddTraceEventWithThreadIdAndTimestamp
// with kNoId as bind_id
TraceEventHandle TraceLog::AddTraceEventWithThreadIdAndTimestamp(
char phase,
const unsigned char* category_group_enabled,
const char* name,
const char* scope,
unsigned long long id,
int thread_id,
const TimeTicks& timestamp,
int num_args,
const char* const* arg_names,
const unsigned char* arg_types,
const unsigned long long* arg_values,
std::unique_ptr<ConvertableToTraceFormat>* convertable_values,
unsigned int flags) {
return AddTraceEventWithThreadIdAndTimestamp(
phase,
category_group_enabled,
name,
scope,
id,
trace_event_internal::kNoId, // bind_id
thread_id,
timestamp,
num_args,
arg_names,
arg_types,
arg_values,
convertable_values,
flags);
}
TraceEventHandle TraceLog::AddTraceEventWithThreadIdAndTimestamp(
char phase,
const unsigned char* category_group_enabled,
const char* name,
const char* scope,
unsigned long long id,
unsigned long long bind_id,
int thread_id,
const TimeTicks& timestamp,
int num_args,
const char* const* arg_names,
const unsigned char* arg_types,
const unsigned long long* arg_values,
std::unique_ptr<ConvertableToTraceFormat>* convertable_values,
unsigned int flags) {
TraceEventHandle handle = {0, 0, 0};
if (!*category_group_enabled)
return handle;
// Avoid re-entrance of AddTraceEvent. This may happen in GPU process when
// ECHO_TO_CONSOLE is enabled: AddTraceEvent -> LOG(ERROR) ->
// GpuProcessLogMessageHandler -> PostPendingTask -> TRACE_EVENT ...
if (thread_is_in_trace_event_.Get())
return handle;
AutoThreadLocalBoolean thread_is_in_trace_event(&thread_is_in_trace_event_);
DCHECK(name);
DCHECK(!timestamp.is_null());
if (flags & TRACE_EVENT_FLAG_MANGLE_ID) {
if ((flags & TRACE_EVENT_FLAG_FLOW_IN) ||
(flags & TRACE_EVENT_FLAG_FLOW_OUT))
bind_id = MangleEventId(bind_id);
id = MangleEventId(id);
}
TimeTicks offset_event_timestamp = OffsetTimestamp(timestamp);
ThreadTicks thread_now = ThreadNow();
ThreadLocalEventBuffer* thread_local_event_buffer = nullptr;
if (*category_group_enabled & RECORDING_MODE) {
// |thread_local_event_buffer_| can be null if the current thread doesn't
// have a message loop or the message loop is blocked.
InitializeThreadLocalEventBufferIfSupported();
thread_local_event_buffer = thread_local_event_buffer_.Get();
}
// Check and update the current thread name only if the event is for the
// current thread to avoid locks in most cases.
if (thread_id == static_cast<int>(PlatformThread::CurrentId())) {
const char* new_name =
ThreadIdNameManager::GetInstance()->GetName(thread_id);
// Check if the thread name has been set or changed since the previous
// call (if any), but don't bother if the new name is empty. Note this will
// not detect a thread name change within the same char* buffer address: we
// favor common case performance over corner case correctness.
static auto* current_thread_name = new ThreadLocalPointer<const char>();
if (new_name != current_thread_name->Get() && new_name && *new_name) {
current_thread_name->Set(new_name);
AutoLock thread_info_lock(thread_info_lock_);
auto existing_name = thread_names_.find(thread_id);
if (existing_name == thread_names_.end()) {
// This is a new thread id, and a new name.
thread_names_[thread_id] = new_name;
} else {
// This is a thread id that we've seen before, but potentially with a
// new name.
std::vector<StringPiece> existing_names = base::SplitStringPiece(
existing_name->second, ",", base::KEEP_WHITESPACE,
base::SPLIT_WANT_NONEMPTY);
if (!ContainsValue(existing_names, new_name)) {
if (!existing_names.empty())
existing_name->second.push_back(',');
existing_name->second.append(new_name);
}
}
}
}
#if defined(OS_WIN)
// This is done sooner rather than later, to avoid creating the event and
// acquiring the lock, which is not needed for ETW as it's already threadsafe.
if (*category_group_enabled & TraceCategory::ENABLED_FOR_ETW_EXPORT)
TraceEventETWExport::AddEvent(phase, category_group_enabled, name, id,
num_args, arg_names, arg_types, arg_values,
convertable_values);
#endif // OS_WIN
AddTraceEventOverrideCallback trace_event_override =
reinterpret_cast<AddTraceEventOverrideCallback>(
subtle::NoBarrier_Load(&trace_event_override_));
if (trace_event_override) {
TraceEvent new_trace_event;
// If we have an override in place for events, rather than sending
// them to the tracelog, we don't have a way of going back and updating
// the duration of _COMPLETE events. Instead, we emit separate _BEGIN
// and _END events.
if (phase == TRACE_EVENT_PHASE_COMPLETE)
phase = TRACE_EVENT_PHASE_BEGIN;
new_trace_event.Initialize(thread_id, offset_event_timestamp, thread_now,
phase, category_group_enabled, name, scope, id,
bind_id, num_args, arg_names, arg_types,
arg_values, convertable_values, flags);
trace_event_override(new_trace_event);
return handle;
}
std::string console_message;
std::unique_ptr<TraceEvent> filtered_trace_event;
bool disabled_by_filters = false;
if (*category_group_enabled & TraceCategory::ENABLED_FOR_FILTERING) {
std::unique_ptr<TraceEvent> new_trace_event(new TraceEvent);
new_trace_event->Initialize(thread_id, offset_event_timestamp, thread_now,
phase, category_group_enabled, name, scope, id,
bind_id, num_args, arg_names, arg_types,
arg_values, convertable_values, flags);
disabled_by_filters = true;
ForEachCategoryFilter(
category_group_enabled, [&new_trace_event, &disabled_by_filters](
TraceEventFilter* trace_event_filter) {
if (trace_event_filter->FilterTraceEvent(*new_trace_event))
disabled_by_filters = false;
});
if (!disabled_by_filters)
filtered_trace_event = std::move(new_trace_event);
}
// If enabled for recording, the event should be added only if one of the
// filters indicates or category is not enabled for filtering.
if ((*category_group_enabled & TraceCategory::ENABLED_FOR_RECORDING) &&
!disabled_by_filters) {
OptionalAutoLock lock(&lock_);
TraceEvent* trace_event = nullptr;
if (thread_local_event_buffer) {
trace_event = thread_local_event_buffer->AddTraceEvent(&handle);
} else {
lock.EnsureAcquired();
trace_event = AddEventToThreadSharedChunkWhileLocked(&handle, true);
}
if (trace_event) {
if (filtered_trace_event) {
trace_event->MoveFrom(std::move(filtered_trace_event));
} else {
trace_event->Initialize(thread_id, offset_event_timestamp, thread_now,
phase, category_group_enabled, name, scope, id,
bind_id, num_args, arg_names, arg_types,
arg_values, convertable_values, flags);
}
#if defined(OS_ANDROID)
trace_event->SendToATrace();
#endif
}
if (trace_options() & kInternalEchoToConsole) {
console_message = EventToConsoleMessage(
phase == TRACE_EVENT_PHASE_COMPLETE ? TRACE_EVENT_PHASE_BEGIN : phase,
timestamp, trace_event);
}
}
if (!console_message.empty())
LOG(ERROR) << console_message;
return handle;
}
void TraceLog::AddMetadataEvent(
const unsigned char* category_group_enabled,
const char* name,
int num_args,
const char* const* arg_names,
const unsigned char* arg_types,
const unsigned long long* arg_values,
std::unique_ptr<ConvertableToTraceFormat>* convertable_values,
unsigned int flags) {
HEAP_PROFILER_SCOPED_IGNORE;
std::unique_ptr<TraceEvent> trace_event(new TraceEvent);
int thread_id = static_cast<int>(base::PlatformThread::CurrentId());
ThreadTicks thread_now = ThreadNow();
TimeTicks now = OffsetNow();
AutoLock lock(lock_);
trace_event->Initialize(
thread_id, now, thread_now, TRACE_EVENT_PHASE_METADATA,
category_group_enabled, name,
trace_event_internal::kGlobalScope, // scope
trace_event_internal::kNoId, // id
trace_event_internal::kNoId, // bind_id
num_args, arg_names, arg_types, arg_values, convertable_values, flags);
metadata_events_.push_back(std::move(trace_event));
}
// May be called when a COMPELETE event ends and the unfinished event has been
// recycled (phase == TRACE_EVENT_PHASE_END and trace_event == NULL).
std::string TraceLog::EventToConsoleMessage(unsigned char phase,
const TimeTicks& timestamp,
TraceEvent* trace_event) {
HEAP_PROFILER_SCOPED_IGNORE;
AutoLock thread_info_lock(thread_info_lock_);
// The caller should translate TRACE_EVENT_PHASE_COMPLETE to
// TRACE_EVENT_PHASE_BEGIN or TRACE_EVENT_END.
DCHECK(phase != TRACE_EVENT_PHASE_COMPLETE);
TimeDelta duration;
int thread_id =
trace_event ? trace_event->thread_id() : PlatformThread::CurrentId();
if (phase == TRACE_EVENT_PHASE_END) {
duration = timestamp - thread_event_start_times_[thread_id].top();
thread_event_start_times_[thread_id].pop();
}
std::string thread_name = thread_names_[thread_id];
if (thread_colors_.find(thread_name) == thread_colors_.end()) {
size_t next_color = (thread_colors_.size() % 6) + 1;
thread_colors_[thread_name] = next_color;
}
std::ostringstream log;
log << base::StringPrintf("%s: \x1b[0;3%dm", thread_name.c_str(),
thread_colors_[thread_name]);
size_t depth = 0;
auto it = thread_event_start_times_.find(thread_id);
if (it != thread_event_start_times_.end())
depth = it->second.size();
for (size_t i = 0; i < depth; ++i)
log << "| ";
if (trace_event)
trace_event->AppendPrettyPrinted(&log);
if (phase == TRACE_EVENT_PHASE_END)
log << base::StringPrintf(" (%.3f ms)", duration.InMillisecondsF());
log << "\x1b[0;m";
if (phase == TRACE_EVENT_PHASE_BEGIN)
thread_event_start_times_[thread_id].push(timestamp);
return log.str();
}
void TraceLog::EndFilteredEvent(const unsigned char* category_group_enabled,
const char* name,
TraceEventHandle handle) {
const char* category_name = GetCategoryGroupName(category_group_enabled);
ForEachCategoryFilter(
category_group_enabled,
[name, category_name](TraceEventFilter* trace_event_filter) {
trace_event_filter->EndEvent(category_name, name);
});
}
void TraceLog::UpdateTraceEventDuration(
const unsigned char* category_group_enabled,
const char* name,
TraceEventHandle handle) {
char category_group_enabled_local = *category_group_enabled;
if (!category_group_enabled_local)
return;
UpdateTraceEventDurationExplicit(category_group_enabled, name, handle,
OffsetNow(), ThreadNow());
}
void TraceLog::UpdateTraceEventDurationExplicit(
const unsigned char* category_group_enabled,
const char* name,
TraceEventHandle handle,
const TimeTicks& now,
const ThreadTicks& thread_now) {
char category_group_enabled_local = *category_group_enabled;
if (!category_group_enabled_local)
return;
// Avoid re-entrance of AddTraceEvent. This may happen in GPU process when
// ECHO_TO_CONSOLE is enabled: AddTraceEvent -> LOG(ERROR) ->
// GpuProcessLogMessageHandler -> PostPendingTask -> TRACE_EVENT ...
if (thread_is_in_trace_event_.Get())
return;
AutoThreadLocalBoolean thread_is_in_trace_event(&thread_is_in_trace_event_);
#if defined(OS_WIN)
// Generate an ETW event that marks the end of a complete event.
if (category_group_enabled_local & TraceCategory::ENABLED_FOR_ETW_EXPORT)
TraceEventETWExport::AddCompleteEndEvent(name);
#endif // OS_WIN
std::string console_message;
if (category_group_enabled_local & TraceCategory::ENABLED_FOR_RECORDING) {
AddTraceEventOverrideCallback trace_event_override =
reinterpret_cast<AddTraceEventOverrideCallback>(
subtle::NoBarrier_Load(&trace_event_override_));
// If we send events off to an override instead of the TraceBuffer,
// we don't have way of updating the prior event so we'll emit a
// separate _END event instead.
if (trace_event_override) {
TraceEvent new_trace_event;
new_trace_event.Initialize(
static_cast<int>(base::PlatformThread::CurrentId()), now, thread_now,
TRACE_EVENT_PHASE_END, category_group_enabled, name,
trace_event_internal::kGlobalScope,
trace_event_internal::kNoId /* id */,
trace_event_internal::kNoId /* bind_id */, 0, nullptr, nullptr,
nullptr, nullptr, TRACE_EVENT_FLAG_NONE);
trace_event_override(new_trace_event);
return;
}
OptionalAutoLock lock(&lock_);
TraceEvent* trace_event = GetEventByHandleInternal(handle, &lock);
if (trace_event) {
DCHECK(trace_event->phase() == TRACE_EVENT_PHASE_COMPLETE);
// TEMP(oysteine) to debug crbug.com/638744
if (trace_event->duration().ToInternalValue() != -1) {
DVLOG(1) << "TraceHandle: chunk_seq " << handle.chunk_seq
<< ", chunk_index " << handle.chunk_index << ", event_index "
<< handle.event_index;
std::string serialized_event;
trace_event->AppendAsJSON(&serialized_event, ArgumentFilterPredicate());
DVLOG(1) << "TraceEvent: " << serialized_event;
lock_.AssertAcquired();
}
trace_event->UpdateDuration(now, thread_now);
#if defined(OS_ANDROID)
trace_event->SendToATrace();
#endif
}
if (trace_options() & kInternalEchoToConsole) {
console_message =
EventToConsoleMessage(TRACE_EVENT_PHASE_END, now, trace_event);
}
}
if (!console_message.empty())
LOG(ERROR) << console_message;
if (category_group_enabled_local & TraceCategory::ENABLED_FOR_FILTERING)
EndFilteredEvent(category_group_enabled, name, handle);
}
uint64_t TraceLog::MangleEventId(uint64_t id) {
return id ^ process_id_hash_;
}
void TraceLog::AddMetadataEventsWhileLocked() {
lock_.AssertAcquired();
// Move metadata added by |AddMetadataEvent| into the trace log.
while (!metadata_events_.empty()) {
TraceEvent* event = AddEventToThreadSharedChunkWhileLocked(nullptr, false);
event->MoveFrom(std::move(metadata_events_.back()));
metadata_events_.pop_back();
}
#if !defined(OS_NACL) // NaCl shouldn't expose the process id.
InitializeMetadataEvent(
AddEventToThreadSharedChunkWhileLocked(nullptr, false), 0, "num_cpus",
"number", base::SysInfo::NumberOfProcessors());
#endif
int current_thread_id = static_cast<int>(base::PlatformThread::CurrentId());
if (process_sort_index_ != 0) {
InitializeMetadataEvent(
AddEventToThreadSharedChunkWhileLocked(nullptr, false),
current_thread_id, "process_sort_index", "sort_index",
process_sort_index_);
}
if (!process_name_.empty()) {
InitializeMetadataEvent(
AddEventToThreadSharedChunkWhileLocked(nullptr, false),
current_thread_id, "process_name", "name", process_name_);
}
TimeDelta process_uptime = TRACE_TIME_NOW() - process_creation_time_;
InitializeMetadataEvent(
AddEventToThreadSharedChunkWhileLocked(nullptr, false), current_thread_id,
"process_uptime_seconds", "uptime", process_uptime.InSeconds());
#if defined(OS_ANDROID)
InitializeMetadataEvent(
AddEventToThreadSharedChunkWhileLocked(nullptr, false), current_thread_id,
"chrome_library_address", "start_address",
base::StringPrintf("%p", &__executable_start));
#endif
if (!process_labels_.empty()) {
std::vector<base::StringPiece> labels;
for (const auto& it : process_labels_)
labels.push_back(it.second);
InitializeMetadataEvent(
AddEventToThreadSharedChunkWhileLocked(nullptr, false),
current_thread_id, "process_labels", "labels",
base::JoinString(labels, ","));
}
// Thread sort indices.
for (const auto& it : thread_sort_indices_) {
if (it.second == 0)
continue;
InitializeMetadataEvent(
AddEventToThreadSharedChunkWhileLocked(nullptr, false), it.first,
"thread_sort_index", "sort_index", it.second);
}
// Thread names.
AutoLock thread_info_lock(thread_info_lock_);
for (const auto& it : thread_names_) {
if (it.second.empty())
continue;
InitializeMetadataEvent(
AddEventToThreadSharedChunkWhileLocked(nullptr, false), it.first,
"thread_name", "name", it.second);
}
// If buffer is full, add a metadata record to report this.
if (!buffer_limit_reached_timestamp_.is_null()) {
InitializeMetadataEvent(
AddEventToThreadSharedChunkWhileLocked(nullptr, false),
current_thread_id, "trace_buffer_overflowed", "overflowed_at_ts",
buffer_limit_reached_timestamp_);
}
}
TraceEvent* TraceLog::GetEventByHandle(TraceEventHandle handle) {
return GetEventByHandleInternal(handle, nullptr);
}
TraceEvent* TraceLog::GetEventByHandleInternal(TraceEventHandle handle,
OptionalAutoLock* lock) {
if (!handle.chunk_seq)
return nullptr;
DCHECK(handle.chunk_seq);
DCHECK(handle.chunk_index <= TraceBufferChunk::kMaxChunkIndex);
DCHECK(handle.event_index <= TraceBufferChunk::kTraceBufferChunkSize - 1);
if (thread_local_event_buffer_.Get()) {
TraceEvent* trace_event =
thread_local_event_buffer_.Get()->GetEventByHandle(handle);
if (trace_event)
return trace_event;
}
// The event has been out-of-control of the thread local buffer.
// Try to get the event from the main buffer with a lock.
if (lock)
lock->EnsureAcquired();
if (thread_shared_chunk_ &&
handle.chunk_index == thread_shared_chunk_index_) {
return handle.chunk_seq == thread_shared_chunk_->seq()
? thread_shared_chunk_->GetEventAt(handle.event_index)
: nullptr;
}
return logged_events_->GetEventByHandle(handle);
}
void TraceLog::SetProcessID(int process_id) {
process_id_ = process_id;
// Create a FNV hash from the process ID for XORing.
// See http://isthe.com/chongo/tech/comp/fnv/ for algorithm details.
const unsigned long long kOffsetBasis = 14695981039346656037ull;
const unsigned long long kFnvPrime = 1099511628211ull;
const unsigned long long pid = static_cast<unsigned long long>(process_id_);
process_id_hash_ = (kOffsetBasis ^ pid) * kFnvPrime;
}
void TraceLog::SetProcessSortIndex(int sort_index) {
AutoLock lock(lock_);
process_sort_index_ = sort_index;
}
void TraceLog::UpdateProcessLabel(int label_id,
const std::string& current_label) {
if (!current_label.length())
return RemoveProcessLabel(label_id);
AutoLock lock(lock_);
process_labels_[label_id] = current_label;
}
void TraceLog::RemoveProcessLabel(int label_id) {
AutoLock lock(lock_);
process_labels_.erase(label_id);
}
void TraceLog::SetThreadSortIndex(PlatformThreadId thread_id, int sort_index) {
AutoLock lock(lock_);
thread_sort_indices_[static_cast<int>(thread_id)] = sort_index;
}
void TraceLog::SetTimeOffset(TimeDelta offset) {
time_offset_ = offset;
}
size_t TraceLog::GetObserverCountForTest() const {
return enabled_state_observer_list_.size();
}
void TraceLog::SetCurrentThreadBlocksMessageLoop() {
thread_blocks_message_loop_.Set(true);
// This will flush the thread local buffer.
delete thread_local_event_buffer_.Get();
}
TraceBuffer* TraceLog::CreateTraceBuffer() {
HEAP_PROFILER_SCOPED_IGNORE;
InternalTraceOptions options = trace_options();
if (options & kInternalRecordContinuously) {
return TraceBuffer::CreateTraceBufferRingBuffer(
kTraceEventRingBufferChunks);
}
if (options & kInternalEchoToConsole) {
return TraceBuffer::CreateTraceBufferRingBuffer(
kEchoToConsoleTraceEventBufferChunks);
}
if (options & kInternalRecordAsMuchAsPossible) {
return TraceBuffer::CreateTraceBufferVectorOfSize(
kTraceEventVectorBigBufferChunks);
}
return TraceBuffer::CreateTraceBufferVectorOfSize(
kTraceEventVectorBufferChunks);
}
#if defined(OS_WIN)
void TraceLog::UpdateETWCategoryGroupEnabledFlags() {
// Go through each category and set/clear the ETW bit depending on whether the
// category is enabled.
for (TraceCategory& category : CategoryRegistry::GetAllCategories()) {
if (base::trace_event::TraceEventETWExport::IsCategoryGroupEnabled(
category.name())) {
category.set_state_flag(TraceCategory::ENABLED_FOR_ETW_EXPORT);
} else {
category.clear_state_flag(TraceCategory::ENABLED_FOR_ETW_EXPORT);
}
}
}
#endif // defined(OS_WIN)
void TraceLog::SetTraceBufferForTesting(
std::unique_ptr<TraceBuffer> trace_buffer) {
AutoLock lock(lock_);
logged_events_ = std::move(trace_buffer);
}
void ConvertableToTraceFormat::EstimateTraceMemoryOverhead(
TraceEventMemoryOverhead* overhead) {
overhead->Add(TraceEventMemoryOverhead::kConvertableToTraceFormat,
sizeof(*this));
}
void TraceLog::AddAsyncEnabledStateObserver(
WeakPtr<AsyncEnabledStateObserver> listener) {
AutoLock lock(lock_);
async_observers_.insert(
std::make_pair(listener.get(), RegisteredAsyncObserver(listener)));
}
void TraceLog::RemoveAsyncEnabledStateObserver(
AsyncEnabledStateObserver* listener) {
AutoLock lock(lock_);
async_observers_.erase(listener);
}
bool TraceLog::HasAsyncEnabledStateObserver(
AsyncEnabledStateObserver* listener) const {
AutoLock lock(lock_);
return ContainsKey(async_observers_, listener);
}
} // namespace trace_event
} // namespace base
namespace trace_event_internal {
ScopedTraceBinaryEfficient::ScopedTraceBinaryEfficient(
const char* category_group,
const char* name) {
// The single atom works because for now the category_group can only be "gpu".
DCHECK_EQ(strcmp(category_group, "gpu"), 0);
static TRACE_EVENT_API_ATOMIC_WORD atomic = 0;
INTERNAL_TRACE_EVENT_GET_CATEGORY_INFO_CUSTOM_VARIABLES(
category_group, atomic, category_group_enabled_);
name_ = name;
if (*category_group_enabled_) {
event_handle_ =
TRACE_EVENT_API_ADD_TRACE_EVENT_WITH_THREAD_ID_AND_TIMESTAMP(
TRACE_EVENT_PHASE_COMPLETE, category_group_enabled_, name,
trace_event_internal::kGlobalScope, // scope
trace_event_internal::kNoId, // id
static_cast<int>(base::PlatformThread::CurrentId()), // thread_id
TRACE_TIME_TICKS_NOW(), trace_event_internal::kZeroNumArgs, nullptr,
nullptr, nullptr, nullptr, TRACE_EVENT_FLAG_NONE);
}
}
ScopedTraceBinaryEfficient::~ScopedTraceBinaryEfficient() {
if (*category_group_enabled_) {
TRACE_EVENT_API_UPDATE_TRACE_EVENT_DURATION(category_group_enabled_, name_,
event_handle_);
}
}
} // namespace trace_event_internal