133 lines
3.9 KiB
C++
133 lines
3.9 KiB
C++
//===-- Timer.cpp -----------------------------------------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "lldb/Utility/Timer.h"
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#include "lldb/Utility/Stream.h"
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#include <algorithm>
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#include <map>
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#include <mutex>
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#include <utility> // for pair
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#include <vector>
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#include <assert.h> // for assert
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#include <stdarg.h> // for va_end, va_list, va_start
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#include <stdio.h>
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using namespace lldb_private;
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#define TIMER_INDENT_AMOUNT 2
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namespace {
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typedef std::vector<Timer *> TimerStack;
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static std::atomic<Timer::Category *> g_categories;
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} // end of anonymous namespace
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std::atomic<bool> Timer::g_quiet(true);
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std::atomic<unsigned> Timer::g_display_depth(0);
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static std::mutex &GetFileMutex() {
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static std::mutex *g_file_mutex_ptr = new std::mutex();
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return *g_file_mutex_ptr;
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}
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static TimerStack &GetTimerStackForCurrentThread() {
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static thread_local TimerStack g_stack;
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return g_stack;
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}
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Timer::Category::Category(const char *cat) : m_name(cat) {
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m_nanos.store(0, std::memory_order_release);
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Category *expected = g_categories;
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do {
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m_next = expected;
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} while (!g_categories.compare_exchange_weak(expected, this));
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}
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void Timer::SetQuiet(bool value) { g_quiet = value; }
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Timer::Timer(Timer::Category &category, const char *format, ...)
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: m_category(category), m_total_start(std::chrono::steady_clock::now()) {
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TimerStack &stack = GetTimerStackForCurrentThread();
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stack.push_back(this);
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if (g_quiet && stack.size() <= g_display_depth) {
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std::lock_guard<std::mutex> lock(GetFileMutex());
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// Indent
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::fprintf(stdout, "%*s", int(stack.size() - 1) * TIMER_INDENT_AMOUNT, "");
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// Print formatted string
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va_list args;
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va_start(args, format);
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::vfprintf(stdout, format, args);
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va_end(args);
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// Newline
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::fprintf(stdout, "\n");
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}
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}
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Timer::~Timer() {
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using namespace std::chrono;
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auto stop_time = steady_clock::now();
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auto total_dur = stop_time - m_total_start;
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auto timer_dur = total_dur - m_child_duration;
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TimerStack &stack = GetTimerStackForCurrentThread();
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if (g_quiet && stack.size() <= g_display_depth) {
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std::lock_guard<std::mutex> lock(GetFileMutex());
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::fprintf(stdout, "%*s%.9f sec (%.9f sec)\n",
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int(stack.size() - 1) * TIMER_INDENT_AMOUNT, "",
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duration<double>(total_dur).count(),
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duration<double>(timer_dur).count());
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}
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assert(stack.back() == this);
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stack.pop_back();
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if (!stack.empty())
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stack.back()->ChildDuration(total_dur);
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// Keep total results for each category so we can dump results.
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m_category.m_nanos += std::chrono::nanoseconds(timer_dur).count();
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}
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void Timer::SetDisplayDepth(uint32_t depth) { g_display_depth = depth; }
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/* binary function predicate:
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* - returns whether a person is less than another person
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*/
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typedef std::pair<const char *, uint64_t> TimerEntry;
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static bool CategoryMapIteratorSortCriterion(const TimerEntry &lhs,
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const TimerEntry &rhs) {
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return lhs.second > rhs.second;
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}
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void Timer::ResetCategoryTimes() {
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for (Category *i = g_categories; i; i = i->m_next)
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i->m_nanos.store(0, std::memory_order_release);
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}
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void Timer::DumpCategoryTimes(Stream *s) {
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std::vector<TimerEntry> sorted;
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for (Category *i = g_categories; i; i = i->m_next) {
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uint64_t nanos = i->m_nanos.load(std::memory_order_acquire);
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if (nanos)
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sorted.push_back(std::make_pair(i->m_name, nanos));
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}
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if (sorted.empty())
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return; // Later code will break without any elements.
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// Sort by time
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std::sort(sorted.begin(), sorted.end(), CategoryMapIteratorSortCriterion);
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for (const auto &timer : sorted)
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s->Printf("%.9f sec for %s\n", timer.second / 1000000000., timer.first);
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}
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