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// Copyright (c) 2013 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 "tools/gn/trace.h"
#include <algorithm>
#include <map>
#include <sstream>
#include <vector>
#include "base/file_util.h"
#include "base/json/string_escape.h"
#include "base/logging.h"
#include "base/strings/stringprintf.h"
#include "base/synchronization/lock.h"
#include "tools/gn/filesystem_utils.h"
#include "tools/gn/label.h"
namespace {
class TraceLog {
public:
TraceLog() {
events_.reserve(16384);
}
~TraceLog() {
// Trace items leanked intentionally.
}
void Add(TraceItem* item) {
base::AutoLock lock(lock_);
events_.push_back(item);
}
// Returns a copy for threadsafety.
std::vector<TraceItem*> events() const { return events_; }
private:
base::Lock lock_;
std::vector<TraceItem*> events_;
DISALLOW_COPY_AND_ASSIGN(TraceLog);
};
TraceLog* trace_log = NULL;
struct Coalesced {
Coalesced() : name_ptr(NULL), total_duration(0.0), count(0) {}
const std::string* name_ptr; // Pointer to a string with the name in it.
double total_duration;
int count;
};
bool DurationGreater(const TraceItem* a, const TraceItem* b) {
return a->delta() > b->delta();
}
bool CoalescedDurationGreater(const Coalesced& a, const Coalesced& b) {
return a.total_duration > b.total_duration;
}
void SummarizeParses(std::vector<const TraceItem*>& loads,
std::ostream& out) {
out << "File parse times: (time in ms, name)\n";
std::sort(loads.begin(), loads.end(), &DurationGreater);
for (size_t i = 0; i < loads.size(); i++) {
out << base::StringPrintf(" %8.2f ",
loads[i]->delta().InMillisecondsF());
out << loads[i]->name() << std::endl;
}
}
void SummarizeCoalesced(std::vector<const TraceItem*>& items,
std::ostream& out) {
// Group by file name.
std::map<std::string, Coalesced> coalesced;
for (size_t i = 0; i < items.size(); i++) {
Coalesced& c = coalesced[items[i]->name()];
c.name_ptr = &items[i]->name();
c.total_duration += items[i]->delta().InMillisecondsF();
c.count++;
}
// Sort by duration.
std::vector<Coalesced> sorted;
for (std::map<std::string, Coalesced>::iterator iter = coalesced.begin();
iter != coalesced.end(); ++iter)
sorted.push_back(iter->second);
std::sort(sorted.begin(), sorted.end(), &CoalescedDurationGreater);
for (size_t i = 0; i < sorted.size(); i++) {
out << base::StringPrintf(" %8.2f %d ",
sorted[i].total_duration, sorted[i].count);
out << *sorted[i].name_ptr << std::endl;
}
}
void SummarizeFileExecs(std::vector<const TraceItem*>& execs,
std::ostream& out) {
out << "File execute times: (total time in ms, # executions, name)\n";
SummarizeCoalesced(execs, out);
}
void SummarizeScriptExecs(std::vector<const TraceItem*>& execs,
std::ostream& out) {
out << "Script execute times: (total time in ms, # executions, name)\n";
SummarizeCoalesced(execs, out);
}
} // namespace
TraceItem::TraceItem(Type type,
const std::string& name,
base::PlatformThreadId thread_id)
: type_(type),
name_(name),
thread_id_(thread_id) {
}
TraceItem::~TraceItem() {
}
ScopedTrace::ScopedTrace(TraceItem::Type t, const std::string& name)
: item_(NULL),
done_(false) {
if (trace_log) {
item_ = new TraceItem(t, name, base::PlatformThread::CurrentId());
item_->set_begin(base::TimeTicks::HighResNow());
}
}
ScopedTrace::ScopedTrace(TraceItem::Type t, const Label& label)
: item_(NULL),
done_(false) {
if (trace_log) {
item_ = new TraceItem(t, label.GetUserVisibleName(false),
base::PlatformThread::CurrentId());
item_->set_begin(base::TimeTicks::HighResNow());
}
}
ScopedTrace::~ScopedTrace() {
Done();
}
void ScopedTrace::SetToolchain(const Label& label) {
if (item_)
item_->set_toolchain(label.GetUserVisibleName(false));
}
void ScopedTrace::SetCommandLine(const CommandLine& cmdline) {
if (item_)
item_->set_cmdline(FilePathToUTF8(cmdline.GetArgumentsString()));
}
void ScopedTrace::Done() {
if (!done_) {
done_ = true;
if (trace_log) {
item_->set_end(base::TimeTicks::HighResNow());
AddTrace(item_);
}
}
}
void EnableTracing() {
CHECK(!trace_log);
trace_log = new TraceLog;
}
void AddTrace(TraceItem* item) {
trace_log->Add(item);
}
std::string SummarizeTraces() {
if (!trace_log)
return std::string();
std::vector<TraceItem*> events = trace_log->events();
// Classify all events.
std::vector<const TraceItem*> parses;
std::vector<const TraceItem*> file_execs;
std::vector<const TraceItem*> script_execs;
for (size_t i = 0; i < events.size(); i++) {
switch (events[i]->type()) {
case TraceItem::TRACE_FILE_PARSE:
parses.push_back(events[i]);
break;
case TraceItem::TRACE_FILE_EXECUTE:
file_execs.push_back(events[i]);
break;
case TraceItem::TRACE_SCRIPT_EXECUTE:
script_execs.push_back(events[i]);
break;
case TraceItem::TRACE_FILE_LOAD:
case TraceItem::TRACE_FILE_WRITE:
case TraceItem::TRACE_DEFINE_TARGET:
break; // Ignore these for the summary.
}
}
std::ostringstream out;
SummarizeParses(parses, out);
out << std::endl;
SummarizeFileExecs(file_execs, out);
out << std::endl;
SummarizeScriptExecs(script_execs, out);
out << std::endl;
return out.str();
}
void SaveTraces(const base::FilePath& file_name) {
std::ostringstream out;
out << "{\"traceEvents\":[";
std::string quote_buffer; // Allocate outside loop to prevent reallocationg.
// Write main thread metadata (assume this is being written on the main
// thread).
out << "{\"pid\":0,\"tid\":" << base::PlatformThread::CurrentId();
out << ",\"ts\":0,\"ph\":\"M\",";
out << "\"name\":\"thread_name\",\"args\":{\"name\":\"Main thread\"}},";
std::vector<TraceItem*> events = trace_log->events();
for (size_t i = 0; i < events.size(); i++) {
const TraceItem& item = *events[i];
if (i != 0)
out << ",";
out << "{\"pid\":0,\"tid\":" << item.thread_id();
out << ",\"ts\":" << item.begin().ToInternalValue();
out << ",\"ph\":\"X\""; // "X" = complete event with begin & duration.
out << ",\"dur\":" << item.delta().InMicroseconds();
quote_buffer.resize(0);
base::EscapeJSONString(item.name(), true, "e_buffer);
out << ",\"name\":" << quote_buffer;
out << ",\"cat\":";
switch (item.type()) {
case TraceItem::TRACE_FILE_LOAD:
out << "\"load\"";
break;
case TraceItem::TRACE_FILE_PARSE:
out << "\"parse\"";
break;
case TraceItem::TRACE_FILE_EXECUTE:
out << "\"file_exec\"";
break;
case TraceItem::TRACE_FILE_WRITE:
out << "\"file_write\"";
break;
case TraceItem::TRACE_SCRIPT_EXECUTE:
out << "\"script_exec\"";
break;
case TraceItem::TRACE_DEFINE_TARGET:
out << "\"define\"";
}
if (!item.toolchain().empty() || !item.cmdline().empty()) {
out << ",\"args\":{";
bool needs_comma = false;
if (!item.toolchain().empty()) {
quote_buffer.resize(0);
base::EscapeJSONString(item.toolchain(), true, "e_buffer);
out << "\"toolchain\":" << quote_buffer;
needs_comma = true;
}
if (!item.cmdline().empty()) {
quote_buffer.resize(0);
base::EscapeJSONString(item.cmdline(), true, "e_buffer);
if (needs_comma)
out << ",";
out << "\"cmdline\":" << quote_buffer;
needs_comma = true;
}
out << "}";
}
out << "}";
}
out << "]}";
std::string out_str = out.str();
base::WriteFile(file_name, out_str.data(),
static_cast<int>(out_str.size()));
}
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