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//===-- Timer.cpp -----------------------------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "lldb/Core/Timer.h"
#include "lldb/Host/Host.h"
#include "lldb/Utility/Stream.h"
#include "lldb/lldb-types.h" // for thread_key_t
#include <algorithm>
#include <map>
#include <mutex>
#include <utility> // for pair
#include <vector>
#include <assert.h> // for assert
#include <stdarg.h> // for va_end, va_list, va_start
#include <stdio.h>
using namespace lldb_private;
#define TIMER_INDENT_AMOUNT 2
namespace {
typedef std::map<const char *, std::chrono::nanoseconds> TimerCategoryMap;
typedef std::vector<Timer *> TimerStack;
} // end of anonymous namespace
std::atomic<bool> Timer::g_quiet(true);
std::atomic<unsigned> Timer::g_display_depth(0);
static std::mutex &GetFileMutex() {
static std::mutex *g_file_mutex_ptr = new std::mutex();
return *g_file_mutex_ptr;
}
static std::mutex &GetCategoryMutex() {
static std::mutex g_category_mutex;
return g_category_mutex;
}
static TimerCategoryMap &GetCategoryMap() {
static TimerCategoryMap g_category_map;
return g_category_map;
}
static void ThreadSpecificCleanup(void *p) {
delete static_cast<TimerStack *>(p);
}
static TimerStack *GetTimerStackForCurrentThread() {
static lldb::thread_key_t g_key =
Host::ThreadLocalStorageCreate(ThreadSpecificCleanup);
void *timer_stack = Host::ThreadLocalStorageGet(g_key);
if (timer_stack == NULL) {
Host::ThreadLocalStorageSet(g_key, new TimerStack);
timer_stack = Host::ThreadLocalStorageGet(g_key);
}
return (TimerStack *)timer_stack;
}
void Timer::SetQuiet(bool value) { g_quiet = value; }
Timer::Timer(const char *category, const char *format, ...)
: m_category(category), m_total_start(std::chrono::steady_clock::now()) {
TimerStack *stack = GetTimerStackForCurrentThread();
if (!stack)
return;
stack->push_back(this);
if (g_quiet && stack->size() <= g_display_depth) {
std::lock_guard<std::mutex> lock(GetFileMutex());
// Indent
::fprintf(stdout, "%*s", int(stack->size() - 1) * TIMER_INDENT_AMOUNT, "");
// Print formatted string
va_list args;
va_start(args, format);
::vfprintf(stdout, format, args);
va_end(args);
// Newline
::fprintf(stdout, "\n");
}
}
Timer::~Timer() {
using namespace std::chrono;
TimerStack *stack = GetTimerStackForCurrentThread();
if (!stack)
return;
auto stop_time = steady_clock::now();
auto total_dur = stop_time - m_total_start;
auto timer_dur = total_dur - m_child_duration;
if (g_quiet && stack->size() <= g_display_depth) {
std::lock_guard<std::mutex> lock(GetFileMutex());
::fprintf(stdout, "%*s%.9f sec (%.9f sec)\n",
int(stack->size() - 1) * TIMER_INDENT_AMOUNT, "",
duration<double>(total_dur).count(),
duration<double>(timer_dur).count());
}
assert(stack->back() == this);
stack->pop_back();
if (!stack->empty())
stack->back()->ChildDuration(total_dur);
// Keep total results for each category so we can dump results.
{
std::lock_guard<std::mutex> guard(GetCategoryMutex());
TimerCategoryMap &category_map = GetCategoryMap();
category_map[m_category] += timer_dur;
}
}
void Timer::SetDisplayDepth(uint32_t depth) { g_display_depth = depth; }
/* binary function predicate:
* - returns whether a person is less than another person
*/
static bool
CategoryMapIteratorSortCriterion(const TimerCategoryMap::const_iterator &lhs,
const TimerCategoryMap::const_iterator &rhs) {
return lhs->second > rhs->second;
}
void Timer::ResetCategoryTimes() {
std::lock_guard<std::mutex> guard(GetCategoryMutex());
TimerCategoryMap &category_map = GetCategoryMap();
category_map.clear();
}
void Timer::DumpCategoryTimes(Stream *s) {
std::lock_guard<std::mutex> guard(GetCategoryMutex());
TimerCategoryMap &category_map = GetCategoryMap();
std::vector<TimerCategoryMap::const_iterator> sorted_iterators;
TimerCategoryMap::const_iterator pos, end = category_map.end();
for (pos = category_map.begin(); pos != end; ++pos) {
sorted_iterators.push_back(pos);
}
std::sort(sorted_iterators.begin(), sorted_iterators.end(),
CategoryMapIteratorSortCriterion);
const size_t count = sorted_iterators.size();
for (size_t i = 0; i < count; ++i) {
const auto timer = sorted_iterators[i]->second;
s->Printf("%.9f sec for %s\n", std::chrono::duration<double>(timer).count(),
sorted_iterators[i]->first);
}
}
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