lld/Common/Timer.h

0001 //===- Timer.h ----------------------------------------------*- C++ -*-===//
0002 //
0003 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
0004 // See https://llvm.org/LICENSE.txt for license information.
0005 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
0006 //
0007 //===----------------------------------------------------------------------===//
0008
0009 #ifndef LLD_COMMON_TIMER_H
0010 #define LLD_COMMON_TIMER_H
0011
0012 #include "llvm/ADT/DenseMap.h"
0013 #include "llvm/ADT/StringRef.h"
0014 #include <assert.h>
0015 #include <atomic>
0016 #include <chrono>
0017 #include <map>
0018 #include <memory>
0019 #include <vector>
0020
0021 namespace lld {
0022
0023 class Timer;
0024
0025 struct ScopedTimer {
0026   explicit ScopedTimer(Timer &t);
0027
0028   ~ScopedTimer();
0029
0030   void stop();
0031
0032   std::chrono::time_point<std::chrono::high_resolution_clock> startTime;
0033
0034   Timer *t = nullptr;
0035 };
0036
0037 class Timer {
0038 public:
0039   Timer(llvm::StringRef name, Timer &parent);
0040
0041   // Creates the root timer.
0042   explicit Timer(llvm::StringRef name);
0043
0044   void addToTotal(std::chrono::nanoseconds time) { total += time.count(); }
0045   void print();
0046
0047   double millis() const;
0048
0049 private:
0050   void print(int depth, double totalDuration, bool recurse = true) const;
0051
0052   std::atomic<std::chrono::nanoseconds::rep> total;
0053   std::vector<Timer *> children;
0054   std::string name;
0055 };
0056
0057 } // namespace lld
0058
0059 #endif