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 }
73