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fix
author mir3636
date Wed, 06 Dec 2017 14:37:17 +0900
parents 803732b1fca8
children
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1 //===-- llvm/Support/Timer.h - Interval Timing Support ----------*- C++ -*-===//
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2 //
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3 // The LLVM Compiler Infrastructure
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4 //
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5 // This file is distributed under the University of Illinois Open Source
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6 // License. See LICENSE.TXT for details.
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7 //
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8 //===----------------------------------------------------------------------===//
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9
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10 #ifndef LLVM_SUPPORT_TIMER_H
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11 #define LLVM_SUPPORT_TIMER_H
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12
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13 #include "llvm/ADT/StringRef.h"
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14 #include "llvm/Support/DataTypes.h"
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15 #include <cassert>
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16 #include <string>
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17 #include <utility>
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18 #include <vector>
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19
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20 namespace llvm {
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21
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22 class Timer;
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23 class TimerGroup;
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24 class raw_ostream;
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25
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26 class TimeRecord {
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27 double WallTime; ///< Wall clock time elapsed in seconds.
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28 double UserTime; ///< User time elapsed.
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29 double SystemTime; ///< System time elapsed.
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30 ssize_t MemUsed; ///< Memory allocated (in bytes).
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31 public:
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32 TimeRecord() : WallTime(0), UserTime(0), SystemTime(0), MemUsed(0) {}
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33
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34 /// Get the current time and memory usage. If Start is true we get the memory
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35 /// usage before the time, otherwise we get time before memory usage. This
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36 /// matters if the time to get the memory usage is significant and shouldn't
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37 /// be counted as part of a duration.
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38 static TimeRecord getCurrentTime(bool Start = true);
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39
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40 double getProcessTime() const { return UserTime + SystemTime; }
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41 double getUserTime() const { return UserTime; }
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42 double getSystemTime() const { return SystemTime; }
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43 double getWallTime() const { return WallTime; }
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44 ssize_t getMemUsed() const { return MemUsed; }
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45
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46 bool operator<(const TimeRecord &T) const {
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47 // Sort by Wall Time elapsed, as it is the only thing really accurate
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48 return WallTime < T.WallTime;
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49 }
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51 void operator+=(const TimeRecord &RHS) {
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52 WallTime += RHS.WallTime;
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53 UserTime += RHS.UserTime;
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54 SystemTime += RHS.SystemTime;
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55 MemUsed += RHS.MemUsed;
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56 }
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57 void operator-=(const TimeRecord &RHS) {
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58 WallTime -= RHS.WallTime;
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59 UserTime -= RHS.UserTime;
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60 SystemTime -= RHS.SystemTime;
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61 MemUsed -= RHS.MemUsed;
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62 }
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63
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64 /// Print the current time record to \p OS, with a breakdown showing
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65 /// contributions to the \p Total time record.
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66 void print(const TimeRecord &Total, raw_ostream &OS) const;
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67 };
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68
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69 /// This class is used to track the amount of time spent between invocations of
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70 /// its startTimer()/stopTimer() methods. Given appropriate OS support it can
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71 /// also keep track of the RSS of the program at various points. By default,
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72 /// the Timer will print the amount of time it has captured to standard error
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73 /// when the last timer is destroyed, otherwise it is printed when its
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74 /// TimerGroup is destroyed. Timers do not print their information if they are
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75 /// never started.
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76 class Timer {
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77 TimeRecord Time; ///< The total time captured.
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78 TimeRecord StartTime; ///< The time startTimer() was last called.
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79 std::string Name; ///< The name of this time variable.
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80 std::string Description; ///< Description of this time variable.
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81 bool Running; ///< Is the timer currently running?
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82 bool Triggered; ///< Has the timer ever been triggered?
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83 TimerGroup *TG = nullptr; ///< The TimerGroup this Timer is in.
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84
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85 Timer **Prev; ///< Pointer to \p Next of previous timer in group.
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86 Timer *Next; ///< Next timer in the group.
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87 public:
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88 explicit Timer(StringRef Name, StringRef Description) {
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89 init(Name, Description);
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90 }
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91 Timer(StringRef Name, StringRef Description, TimerGroup &tg) {
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92 init(Name, Description, tg);
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93 }
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94 Timer(const Timer &RHS) {
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95 assert(!RHS.TG && "Can only copy uninitialized timers");
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96 }
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97 const Timer &operator=(const Timer &T) {
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98 assert(!TG && !T.TG && "Can only assign uninit timers");
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99 return *this;
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100 }
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101 ~Timer();
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102
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103 /// Create an uninitialized timer, client must use 'init'.
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104 explicit Timer() {}
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105 void init(StringRef Name, StringRef Description);
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106 void init(StringRef Name, StringRef Description, TimerGroup &tg);
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107
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108 const std::string &getName() const { return Name; }
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109 const std::string &getDescription() const { return Description; }
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110 bool isInitialized() const { return TG != nullptr; }
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111
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112 /// Check if the timer is currently running.
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113 bool isRunning() const { return Running; }
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114
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115 /// Check if startTimer() has ever been called on this timer.
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116 bool hasTriggered() const { return Triggered; }
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117
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118 /// Start the timer running. Time between calls to startTimer/stopTimer is
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119 /// counted by the Timer class. Note that these calls must be correctly
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120 /// paired.
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121 void startTimer();
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122
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123 /// Stop the timer.
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124 void stopTimer();
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125
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126 /// Clear the timer state.
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127 void clear();
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128
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129 /// Return the duration for which this timer has been running.
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130 TimeRecord getTotalTime() const { return Time; }
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131
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132 private:
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133 friend class TimerGroup;
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134 };
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135
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136 /// The TimeRegion class is used as a helper class to call the startTimer() and
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137 /// stopTimer() methods of the Timer class. When the object is constructed, it
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138 /// starts the timer specified as its argument. When it is destroyed, it stops
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139 /// the relevant timer. This makes it easy to time a region of code.
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140 class TimeRegion {
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141 Timer *T;
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142 TimeRegion(const TimeRegion &) = delete;
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143
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144 public:
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145 explicit TimeRegion(Timer &t) : T(&t) {
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146 T->startTimer();
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147 }
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148 explicit TimeRegion(Timer *t) : T(t) {
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149 if (T) T->startTimer();
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150 }
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151 ~TimeRegion() {
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152 if (T) T->stopTimer();
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153 }
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154 };
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155
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156 /// This class is basically a combination of TimeRegion and Timer. It allows
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157 /// you to declare a new timer, AND specify the region to time, all in one
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158 /// statement. All timers with the same name are merged. This is primarily
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159 /// used for debugging and for hunting performance problems.
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160 struct NamedRegionTimer : public TimeRegion {
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161 explicit NamedRegionTimer(StringRef Name, StringRef Description,
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162 StringRef GroupName,
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163 StringRef GroupDescription, bool Enabled = true);
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164 };
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165
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166 /// The TimerGroup class is used to group together related timers into a single
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167 /// report that is printed when the TimerGroup is destroyed. It is illegal to
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168 /// destroy a TimerGroup object before all of the Timers in it are gone. A
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169 /// TimerGroup can be specified for a newly created timer in its constructor.
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170 class TimerGroup {
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171 struct PrintRecord {
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172 TimeRecord Time;
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173 std::string Name;
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174 std::string Description;
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175
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176 PrintRecord(const PrintRecord &Other) = default;
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177 PrintRecord(const TimeRecord &Time, const std::string &Name,
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178 const std::string &Description)
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179 : Time(Time), Name(Name), Description(Description) {}
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180
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181 bool operator <(const PrintRecord &Other) const {
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182 return Time < Other.Time;
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183 }
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184 };
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185 std::string Name;
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186 std::string Description;
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187 Timer *FirstTimer = nullptr; ///< First timer in the group.
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188 std::vector<PrintRecord> TimersToPrint;
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189
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190 TimerGroup **Prev; ///< Pointer to Next field of previous timergroup in list.
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191 TimerGroup *Next; ///< Pointer to next timergroup in list.
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192 TimerGroup(const TimerGroup &TG) = delete;
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193 void operator=(const TimerGroup &TG) = delete;
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194
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195 public:
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196 explicit TimerGroup(StringRef Name, StringRef Description);
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197 ~TimerGroup();
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198
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199 void setName(StringRef NewName, StringRef NewDescription) {
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200 Name.assign(NewName.begin(), NewName.end());
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201 Description.assign(NewDescription.begin(), NewDescription.end());
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202 }
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203
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204 /// Print any started timers in this group and zero them.
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205 void print(raw_ostream &OS);
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206
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207 /// This static method prints all timers and clears them all out.
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208 static void printAll(raw_ostream &OS);
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209
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210 /// Prints all timers as JSON key/value pairs, and clears them all out.
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211 static const char *printAllJSONValues(raw_ostream &OS, const char *delim);
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212
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213 /// Ensure global timer group lists are initialized. This function is mostly
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214 /// used by the Statistic code to influence the construction and destruction
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215 /// order of the global timer lists.
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216 static void ConstructTimerLists();
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217 private:
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218 friend class Timer;
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219 friend void PrintStatisticsJSON(raw_ostream &OS);
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220 void addTimer(Timer &T);
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221 void removeTimer(Timer &T);
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222 void prepareToPrintList();
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223 void PrintQueuedTimers(raw_ostream &OS);
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224 void printJSONValue(raw_ostream &OS, const PrintRecord &R,
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225 const char *suffix, double Value);
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226 const char *printJSONValues(raw_ostream &OS, const char *delim);
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227 };
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228
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229 } // end namespace llvm
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230
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231 #endif