1 //===-- Statistic.cpp - Easy way to expose stats information --------------===//
3 // This file implements the 'Statistic' class, which is designed to be an easy
4 // way to expose various success metrics from passes. These statistics are
5 // printed at the end of a run, when the -stats command line option is enabled
6 // on the command line.
8 // This is useful for reporting information like the number of instructions
9 // simplified, optimized or removed by various transformations, like this:
11 // static Statistic<> NumInstEliminated("GCSE - Number of instructions killed");
13 // Later, in the code: ++NumInstEliminated;
15 //===----------------------------------------------------------------------===//
17 #include "Support/Statistic.h"
18 #include "Support/CommandLine.h"
22 // GetLibSupportInfoOutputFile - Return a file stream to print our output on...
23 std::ostream *GetLibSupportInfoOutputFile();
25 unsigned StatisticBase::NumStats = 0;
27 // -stats - Command line option to cause transformations to emit stats about
31 Enabled("stats", cl::desc("Enable statistics output from program"));
35 const char *Name, *Desc;
37 StatRecord(const std::string V, const char *N, const char *D)
38 : Value(V), Name(N), Desc(D) {}
40 bool operator<(const StatRecord &SR) const {
41 return std::strcmp(Name, SR.Name) < 0;
44 void print(unsigned ValFieldSize, unsigned NameFieldSize,
46 OS << std::string(ValFieldSize-Value.length(), ' ')
47 << Value << " " << Name
48 << std::string(NameFieldSize-std::strlen(Name), ' ')
49 << " - " << Desc << "\n";
53 static std::vector<StatRecord> *AccumStats = 0;
55 // Print information when destroyed, iff command line option is specified
56 void StatisticBase::destroy() const {
57 if (Enabled && hasSomeData()) {
59 AccumStats = new std::vector<StatRecord>();
61 std::ostringstream Out;
63 AccumStats->push_back(StatRecord(Out.str(), Name, Desc));
66 if (--NumStats == 0 && AccumStats) {
67 std::ostream *OutStream = GetLibSupportInfoOutputFile();
69 // Figure out how long the biggest Value and Name fields are...
70 unsigned MaxNameLen = 0, MaxValLen = 0;
71 for (unsigned i = 0, e = AccumStats->size(); i != e; ++i) {
72 MaxValLen = std::max(MaxValLen,
73 (unsigned)(*AccumStats)[i].Value.length());
74 MaxNameLen = std::max(MaxNameLen,
75 (unsigned)std::strlen((*AccumStats)[i].Name));
79 std::stable_sort(AccumStats->begin(), AccumStats->end());
81 // Print out the statistics header...
82 *OutStream << "===" << std::string(73, '-') << "===\n"
83 << " ... Statistics Collected ...\n"
84 << "===" << std::string(73, '-') << "===\n\n";
86 // Print all of the statistics accumulated...
87 for (unsigned i = 0, e = AccumStats->size(); i != e; ++i)
88 (*AccumStats)[i].print(MaxValLen, MaxNameLen, *OutStream);
90 *OutStream << std::endl; // Flush the output stream...
92 // Free all accumulated statistics...
95 if (OutStream != &std::cerr && OutStream != &std::cout)
96 delete OutStream; // Close the file...