lld/Common/Timer.cpp

   1 //===- Timer.cpp ----------------------------------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #include "lld/Common/Timer.h"
  10 #include "lld/Common/ErrorHandler.h"
  11 #include "llvm/ADT/SmallString.h"
  12 #include "llvm/Support/Format.h"
  13 #include <ratio>
  14
  15 using namespace lld;
  16 using namespace llvm;
  17
  18 ScopedTimer::ScopedTimer(Timer &t) : t(&t) {
  19   startTime = std::chrono::high_resolution_clock::now();
  20 }
  21
  22 void ScopedTimer::stop() {
  23   if (!t)
  24     return;
  25   t->addToTotal(std::chrono::high_resolution_clock::now() - startTime);
  26   t = nullptr;
  27 }
  28
  29 ScopedTimer::~ScopedTimer() { stop(); }
  30
  31 Timer::Timer(llvm::StringRef name) : total(0), name(std::string(name)) {}
  32 Timer::Timer(llvm::StringRef name, Timer &parent)
  33     : total(0), name(std::string(name)) {
  34   parent.children.push_back(this);
  35 }
  36
  37 void Timer::print() {
  38   double totalDuration = static_cast<double>(millis());
  39
  40   // We want to print the grand total under all the intermediate phases, so we
  41   // print all children first, then print the total under that.
  42   for (const auto &child : children)
  43     if (child->total > 0)
  44       child->print(1, totalDuration);
  45
  46   message(std::string(50, '-'));
  47
  48   print(0, millis(), false);
  49 }
  50
  51 double Timer::millis() const {
  52   return std::chrono::duration_cast<std::chrono::duration<double, std::milli>>(
  53              std::chrono::nanoseconds(total))
  54       .count();
  55 }
  56
  57 void Timer::print(int depth, double totalDuration, bool recurse) const {
  58   double p = 100.0 * millis() / totalDuration;
  59
  60   SmallString<32> str;
  61   llvm::raw_svector_ostream stream(str);
  62   std::string s = std::string(depth * 2, ' ') + name + std::string(":");
  63   stream << format("%-30s%7d ms (%5.1f%%)", s.c_str(), (int)millis(), p);
  64
  65   message(str);
  66
  67   if (recurse) {
  68     for (const auto &child : children)
  69       if (child->total > 0)
  70         child->print(depth + 1, totalDuration);
  71   }
  72 }