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/Support/Format.h"
12 
13 using namespace lld;
14 using namespace llvm;
15 
16 ScopedTimer::ScopedTimer(Timer &t) : t(&t) {
17   startTime = std::chrono::high_resolution_clock::now();
18 }
19 
20 void ScopedTimer::stop() {
21   if (!t)
22     return;
23   t->addToTotal(std::chrono::high_resolution_clock::now() - startTime);
24   t = nullptr;
25 }
26 
27 ScopedTimer::~ScopedTimer() { stop(); }
28 
29 Timer::Timer(llvm::StringRef name) : name(std::string(name)) {}
30 Timer::Timer(llvm::StringRef name, Timer &parent) : name(std::string(name)) {
31   parent.children.push_back(this);
32 }
33 
34 Timer &Timer::root() {
35   static Timer rootTimer("Total Link Time");
36   return rootTimer;
37 }
38 
39 void Timer::print() {
40   double totalDuration = static_cast<double>(root().millis());
41 
42   // We want to print the grand total under all the intermediate phases, so we
43   // print all children first, then print the total under that.
44   for (const auto &child : children)
45     if (child->total > 0)
46       child->print(1, totalDuration);
47 
48   message(std::string(50, '-'));
49 
50   root().print(0, root().millis(), false);
51 }
52 
53 double Timer::millis() const {
54   return std::chrono::duration_cast<std::chrono::duration<double, std::milli>>(
55              std::chrono::nanoseconds(total))
56       .count();
57 }
58 
59 void Timer::print(int depth, double totalDuration, bool recurse) const {
60   double p = 100.0 * millis() / totalDuration;
61 
62   SmallString<32> str;
63   llvm::raw_svector_ostream stream(str);
64   std::string s = std::string(depth * 2, ' ') + name + std::string(":");
65   stream << format("%-30s%7d ms (%5.1f%%)", s.c_str(), (int)millis(), p);
66 
67   message(str);
68 
69   if (recurse) {
70     for (const auto &child : children)
71       if (child->total > 0)
72         child->print(depth + 1, totalDuration);
73   }
74 }
75