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// 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 "base/trace_event/trace_event_impl.h"
#include <fcntl.h>
#include <stddef.h>
#include <stdint.h>
#include "base/format_macros.h"
#include "base/logging.h"
#include "base/posix/eintr_wrapper.h"
#include "base/strings/stringprintf.h"
#include "base/synchronization/waitable_event.h"
#include "base/threading/thread.h"
#include "base/trace_event/trace_event.h"
namespace base {
namespace trace_event {
namespace {
int g_atrace_fd = -1;
const char kATraceMarkerFile[] = "/sys/kernel/debug/tracing/trace_marker";
void WriteToATrace(int fd, const char* buffer, size_t size) {
size_t total_written = 0;
while (total_written < size) {
ssize_t written = HANDLE_EINTR(write(
fd, buffer + total_written, size - total_written));
if (written <= 0)
break;
total_written += written;
}
if (total_written < size) {
PLOG(WARNING) << "Failed to write buffer '" << std::string(buffer, size)
<< "' to " << kATraceMarkerFile;
}
}
void WriteEvent(
char phase,
const char* category_group,
const char* name,
unsigned long long id,
const char** arg_names,
const unsigned char* arg_types,
const TraceEvent::TraceValue* arg_values,
const std::unique_ptr<ConvertableToTraceFormat>* convertable_values,
unsigned int flags) {
std::string out = StringPrintf("%c|%d|%s", phase, getpid(), name);
if (flags & TRACE_EVENT_FLAG_HAS_ID)
StringAppendF(&out, "-%" PRIx64, static_cast<uint64_t>(id));
out += '|';
for (int i = 0; i < kTraceMaxNumArgs && arg_names[i];
++i) {
if (i)
out += ';';
out += arg_names[i];
out += '=';
std::string::size_type value_start = out.length();
if (arg_types[i] == TRACE_VALUE_TYPE_CONVERTABLE)
convertable_values[i]->AppendAsTraceFormat(&out);
else
TraceEvent::AppendValueAsJSON(arg_types[i], arg_values[i], &out);
// Remove the quotes which may confuse the atrace script.
ReplaceSubstringsAfterOffset(&out, value_start, "\\\"", "'");
ReplaceSubstringsAfterOffset(&out, value_start, "\"", "");
// Replace chars used for separators with similar chars in the value.
std::replace(out.begin() + value_start, out.end(), ';', ',');
std::replace(out.begin() + value_start, out.end(), '|', '!');
}
out += '|';
out += category_group;
WriteToATrace(g_atrace_fd, out.c_str(), out.size());
}
void NoOpOutputCallback(WaitableEvent* complete_event,
const scoped_refptr<RefCountedString>&,
bool has_more_events) {
if (!has_more_events)
complete_event->Signal();
}
void EndChromeTracing(TraceLog* trace_log,
WaitableEvent* complete_event) {
trace_log->SetDisabled();
// Delete the buffered trace events as they have been sent to atrace.
trace_log->Flush(Bind(&NoOpOutputCallback, complete_event));
}
} // namespace
// These functions support Android systrace.py when 'webview' category is
// traced. With the new adb_profile_chrome, we may have two phases:
// - before WebView is ready for combined tracing, we can use adb_profile_chrome
// to trace android categories other than 'webview' and chromium categories.
// In this way we can avoid the conflict between StartATrace/StopATrace and
// the intents.
// - TODO(wangxianzhu): after WebView is ready for combined tracing, remove
// StartATrace, StopATrace and SendToATrace, and perhaps send Java traces
// directly to atrace in trace_event_binding.cc.
void TraceLog::StartATrace() {
if (g_atrace_fd != -1)
return;
g_atrace_fd = HANDLE_EINTR(open(kATraceMarkerFile, O_WRONLY));
if (g_atrace_fd == -1) {
PLOG(WARNING) << "Couldn't open " << kATraceMarkerFile;
return;
}
TraceConfig trace_config;
trace_config.SetTraceRecordMode(RECORD_CONTINUOUSLY);
SetEnabled(trace_config, TraceLog::RECORDING_MODE);
}
void TraceLog::StopATrace() {
if (g_atrace_fd == -1)
return;
close(g_atrace_fd);
g_atrace_fd = -1;
// TraceLog::Flush() requires the current thread to have a message loop, but
// this thread called from Java may not have one, so flush in another thread.
Thread end_chrome_tracing_thread("end_chrome_tracing");
WaitableEvent complete_event(WaitableEvent::ResetPolicy::AUTOMATIC,
WaitableEvent::InitialState::NOT_SIGNALED);
end_chrome_tracing_thread.Start();
end_chrome_tracing_thread.task_runner()->PostTask(
FROM_HERE, base::Bind(&EndChromeTracing, Unretained(this),
Unretained(&complete_event)));
complete_event.Wait();
}
void TraceEvent::SendToATrace() {
if (g_atrace_fd == -1)
return;
const char* category_group =
TraceLog::GetCategoryGroupName(category_group_enabled_);
switch (phase_) {
case TRACE_EVENT_PHASE_BEGIN:
WriteEvent('B', category_group, name_, id_,
arg_names_, arg_types_, arg_values_, convertable_values_,
flags_);
break;
case TRACE_EVENT_PHASE_COMPLETE:
WriteEvent(duration_.ToInternalValue() == -1 ? 'B' : 'E',
category_group, name_, id_,
arg_names_, arg_types_, arg_values_, convertable_values_,
flags_);
break;
case TRACE_EVENT_PHASE_END:
// Though a single 'E' is enough, here append pid, name and
// category_group etc. So that unpaired events can be found easily.
WriteEvent('E', category_group, name_, id_,
arg_names_, arg_types_, arg_values_, convertable_values_,
flags_);
break;
case TRACE_EVENT_PHASE_INSTANT:
// Simulate an instance event with a pair of begin/end events.
WriteEvent('B', category_group, name_, id_,
arg_names_, arg_types_, arg_values_, convertable_values_,
flags_);
WriteToATrace(g_atrace_fd, "E", 1);
break;
case TRACE_EVENT_PHASE_COUNTER:
for (int i = 0; i < kTraceMaxNumArgs && arg_names_[i]; ++i) {
DCHECK(arg_types_[i] == TRACE_VALUE_TYPE_INT);
std::string out = base::StringPrintf(
"C|%d|%s-%s", getpid(), name_, arg_names_[i]);
if (flags_ & TRACE_EVENT_FLAG_HAS_ID)
StringAppendF(&out, "-%" PRIx64, static_cast<uint64_t>(id_));
StringAppendF(&out, "|%d|%s",
static_cast<int>(arg_values_[i].as_int), category_group);
WriteToATrace(g_atrace_fd, out.c_str(), out.size());
}
break;
default:
// Do nothing.
break;
}
}
void TraceLog::AddClockSyncMetadataEvent() {
int atrace_fd = HANDLE_EINTR(open(kATraceMarkerFile, O_WRONLY | O_APPEND));
if (atrace_fd == -1) {
PLOG(WARNING) << "Couldn't open " << kATraceMarkerFile;
return;
}
// Android's kernel trace system has a trace_marker feature: this is a file on
// debugfs that takes the written data and pushes it onto the trace
// buffer. So, to establish clock sync, we write our monotonic clock into that
// trace buffer.
double now_in_seconds = (TimeTicks::Now() - TimeTicks()).InSecondsF();
std::string marker = StringPrintf(
"trace_event_clock_sync: parent_ts=%f\n", now_in_seconds);
WriteToATrace(atrace_fd, marker.c_str(), marker.size());
close(atrace_fd);
}
} // namespace trace_event
} // namespace base
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