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annotate lib/Support/Statistic.cpp @ 77:54457678186b

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LLVM 3.6
author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Mon, 08 Sep 2014 22:06:00 +0900
parents 95c75e76d11b
children afa8332a0e37
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1 //===-- Statistic.cpp - Easy way to expose stats information --------------===//
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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 // This file implements the 'Statistic' class, which is designed to be an easy
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11 // way to expose various success metrics from passes. These statistics are
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12 // printed at the end of a run, when the -stats command line option is enabled
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13 // on the command line.
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14 //
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15 // This is useful for reporting information like the number of instructions
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16 // simplified, optimized or removed by various transformations, like this:
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17 //
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18 // static Statistic NumInstEliminated("GCSE", "Number of instructions killed");
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19 //
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20 // Later, in the code: ++NumInstEliminated;
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21 //
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22 //===----------------------------------------------------------------------===//
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23
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24 #include "llvm/ADT/Statistic.h"
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25 #include "llvm/ADT/StringExtras.h"
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26 #include "llvm/Support/CommandLine.h"
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27 #include "llvm/Support/Debug.h"
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28 #include "llvm/Support/Format.h"
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29 #include "llvm/Support/ManagedStatic.h"
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30 #include "llvm/Support/Mutex.h"
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31 #include "llvm/Support/raw_ostream.h"
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32 #include <algorithm>
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33 #include <cstring>
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34 using namespace llvm;
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35
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36 // CreateInfoOutputFile - Return a file stream to print our output on.
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37 namespace llvm { extern raw_ostream *CreateInfoOutputFile(); }
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38
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39 /// -stats - Command line option to cause transformations to emit stats about
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40 /// what they did.
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41 ///
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42 static cl::opt<bool>
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43 Enabled(
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44 "stats",
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45 cl::desc("Enable statistics output from program (available with Asserts)"));
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46
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47
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48 namespace {
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49 /// StatisticInfo - This class is used in a ManagedStatic so that it is created
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50 /// on demand (when the first statistic is bumped) and destroyed only when
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51 /// llvm_shutdown is called. We print statistics from the destructor.
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52 class StatisticInfo {
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53 std::vector<const Statistic*> Stats;
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54 friend void llvm::PrintStatistics();
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55 friend void llvm::PrintStatistics(raw_ostream &OS);
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56 public:
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57 ~StatisticInfo();
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58
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59 void addStatistic(const Statistic *S) {
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60 Stats.push_back(S);
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61 }
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62 };
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63 }
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64
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65 static ManagedStatic<StatisticInfo> StatInfo;
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66 static ManagedStatic<sys::SmartMutex<true> > StatLock;
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67
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68 /// RegisterStatistic - The first time a statistic is bumped, this method is
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69 /// called.
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70 void Statistic::RegisterStatistic() {
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71 // If stats are enabled, inform StatInfo that this statistic should be
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72 // printed.
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73 sys::SmartScopedLock<true> Writer(*StatLock);
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74 if (!Initialized) {
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75 if (Enabled)
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76 StatInfo->addStatistic(this);
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77
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78 TsanHappensBefore(this);
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79 sys::MemoryFence();
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80 // Remember we have been registered.
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81 TsanIgnoreWritesBegin();
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82 Initialized = true;
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83 TsanIgnoreWritesEnd();
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84 }
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85 }
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86
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87 // Print information when destroyed, iff command line option is specified.
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88 StatisticInfo::~StatisticInfo() {
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89 llvm::PrintStatistics();
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90 }
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91
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92 void llvm::EnableStatistics() {
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93 Enabled.setValue(true);
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94 }
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95
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96 bool llvm::AreStatisticsEnabled() {
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97 return Enabled;
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98 }
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99
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100 void llvm::PrintStatistics(raw_ostream &OS) {
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101 StatisticInfo &Stats = *StatInfo;
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102
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103 // Figure out how long the biggest Value and Name fields are.
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104 unsigned MaxNameLen = 0, MaxValLen = 0;
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105 for (size_t i = 0, e = Stats.Stats.size(); i != e; ++i) {
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106 MaxValLen = std::max(MaxValLen,
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107 (unsigned)utostr(Stats.Stats[i]->getValue()).size());
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108 MaxNameLen = std::max(MaxNameLen,
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109 (unsigned)std::strlen(Stats.Stats[i]->getName()));
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110 }
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111
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112 // Sort the fields by name.
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113 std::stable_sort(Stats.Stats.begin(), Stats.Stats.end(),
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114 [](const Statistic *LHS, const Statistic *RHS) {
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115 if (int Cmp = std::strcmp(LHS->getName(), RHS->getName()))
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116 return Cmp < 0;
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117
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118 // Secondary key is the description.
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119 return std::strcmp(LHS->getDesc(), RHS->getDesc()) < 0;
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120 });
0
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121
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122 // Print out the statistics header...
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123 OS << "===" << std::string(73, '-') << "===\n"
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124 << " ... Statistics Collected ...\n"
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125 << "===" << std::string(73, '-') << "===\n\n";
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126
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127 // Print all of the statistics.
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128 for (size_t i = 0, e = Stats.Stats.size(); i != e; ++i)
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129 OS << format("%*u %-*s - %s\n",
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130 MaxValLen, Stats.Stats[i]->getValue(),
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131 MaxNameLen, Stats.Stats[i]->getName(),
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132 Stats.Stats[i]->getDesc());
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133
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134 OS << '\n'; // Flush the output stream.
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135 OS.flush();
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136
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137 }
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138
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139 void llvm::PrintStatistics() {
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140 #if !defined(NDEBUG) || defined(LLVM_ENABLE_STATS)
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141 StatisticInfo &Stats = *StatInfo;
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142
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143 // Statistics not enabled?
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144 if (Stats.Stats.empty()) return;
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145
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146 // Get the stream to write to.
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147 raw_ostream &OutStream = *CreateInfoOutputFile();
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148 PrintStatistics(OutStream);
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149 delete &OutStream; // Close the file.
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150 #else
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151 // Check if the -stats option is set instead of checking
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152 // !Stats.Stats.empty(). In release builds, Statistics operators
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153 // do nothing, so stats are never Registered.
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154 if (Enabled) {
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155 // Get the stream to write to.
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156 raw_ostream &OutStream = *CreateInfoOutputFile();
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157 OutStream << "Statistics are disabled. "
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158 << "Build with asserts or with -DLLVM_ENABLE_STATS\n";
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159 OutStream.flush();
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160 delete &OutStream; // Close the file.
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161 }
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162 #endif
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163 }