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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/format_macros.h"
#include "base/logging.h"
#include "base/stringprintf.h"
namespace {
int g_atrace_fd = -1;
const char* kATraceMarkerFile = "/sys/kernel/debug/tracing/trace_marker";
void WriteEvent(
char phase,
const char* category_group,
const char* name,
unsigned long long id,
int num_args,
const char** arg_names,
const unsigned char* arg_types,
const unsigned long long* arg_values,
scoped_ptr<base::debug::ConvertableToTraceFormat> convertable_values[],
unsigned char flags) {
std::string out = base::StringPrintf("%c|%d|%s", phase, getpid(), name);
if (flags & TRACE_EVENT_FLAG_HAS_ID)
base::StringAppendF(&out, "-%" PRIx64, static_cast<uint64>(id));
out += '|';
for (int i = 0; i < num_args; ++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 {
base::debug::TraceEvent::TraceValue value;
value.as_uint = arg_values[i];
base::debug::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(), '|', '!');
}
out += '|';
out += category_group;
write(g_atrace_fd, out.c_str(), out.size());
}
} // namespace
namespace base {
namespace debug {
void TraceLog::StartATrace() {
AutoLock lock(lock_);
if (g_atrace_fd == -1) {
g_atrace_fd = open(kATraceMarkerFile, O_WRONLY);
if (g_atrace_fd == -1)
LOG(WARNING) << "Couldn't open " << kATraceMarkerFile;
}
}
void TraceLog::StopATrace() {
AutoLock lock(lock_);
if (g_atrace_fd != -1) {
close(g_atrace_fd);
g_atrace_fd = -1;
}
}
void TraceLog::SendToATrace(
char phase,
const char* category_group,
const char* name,
unsigned long long id,
int num_args,
const char** arg_names,
const unsigned char* arg_types,
const unsigned long long* arg_values,
scoped_ptr<ConvertableToTraceFormat> convertable_values[],
unsigned char flags) {
if (g_atrace_fd == -1)
return;
switch (phase) {
case TRACE_EVENT_PHASE_BEGIN:
WriteEvent('B', category_group, name, id,
num_args, 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,
num_args, 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,
num_args, arg_names, arg_types, arg_values, convertable_values,
flags);
write(g_atrace_fd, "E", 1);
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 = base::StringPrintf("C|%d|%s-%s",
getpid(), name, arg_names[i]);
if (flags & TRACE_EVENT_FLAG_HAS_ID)
StringAppendF(&out, "-%" PRIx64, static_cast<uint64>(id));
StringAppendF(&out, "|%d|%s",
static_cast<int>(arg_values[i]), category_group);
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_group_enabled) {
if (g_atrace_fd != -1)
*category_group_enabled |= ATRACE_ENABLED;
else
*category_group_enabled &= ~ATRACE_ENABLED;
}
} // namespace debug
} // namespace base
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