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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/debug/trace_event_impl.h"
#include <fcntl.h>
#include "base/debug/trace_event.h"
#include "base/logging.h"
#include "base/stringprintf.h"
namespace {
int g_atrace_fd = -1;
const char* kATraceMarkerFile = "/sys/kernel/debug/tracing/trace_marker";
} // namespace
namespace base {
namespace debug {
// static
void TraceLog::InitATrace() {
DCHECK(g_atrace_fd == -1);
g_atrace_fd = open(kATraceMarkerFile, O_WRONLY | O_APPEND);
if (g_atrace_fd == -1)
LOG(WARNING) << "Couldn't open " << kATraceMarkerFile;
}
void TraceLog::SendToATrace(char phase,
const char* category,
const char* name,
int num_args,
const char** arg_names,
const unsigned char* arg_types,
const unsigned long long* arg_values) {
if (g_atrace_fd == -1)
return;
switch (phase) {
case TRACE_EVENT_PHASE_BEGIN:
case TRACE_EVENT_PHASE_INSTANT: {
std::string out = StringPrintf("B|%d|%s-%s", getpid(), category, name);
for (int i = 0; i < num_args; ++i) {
out += (i == 0 ? '|' : ';');
out += arg_names[i];
out += '=';
TraceEvent::TraceValue value;
value.as_uint = arg_values[i];
std::string::size_type value_start = out.length();
TraceEvent::AppendValueAsJSON(arg_types[i], value, &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(), '|', '!');
}
write(g_atrace_fd, out.c_str(), out.size());
if (phase != TRACE_EVENT_PHASE_INSTANT)
break;
// Fall through. Simulate an instance event with a pair of begin/end.
}
case TRACE_EVENT_PHASE_END: {
// Though a single 'E' is enough, here append pid and name so that
// unpaired events can be found easily.
std::string out = StringPrintf("E|%d|%s-%s", getpid(), category, name);
write(g_atrace_fd, out.c_str(), out.size());
break;
}
case TRACE_EVENT_PHASE_COUNTER:
for (int i = 0; i < num_args; ++i) {
DCHECK(arg_types[i] == TRACE_VALUE_TYPE_INT);
std::string out = StringPrintf(
"C|%d|%s-%s-%s|%d",
getpid(), category, name,
arg_names[i], static_cast<int>(arg_values[i]));
write(g_atrace_fd, out.c_str(), out.size());
}
break;
default:
// Do nothing.
break;
}
}
// Must be called with lock_ locked.
void TraceLog::ApplyATraceEnabledFlag(unsigned char* category_enabled) {
if (g_atrace_fd != -1)
*category_enabled |= ATRACE_ENABLED;
}
} // namespace debug
} // namespace base
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