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"
23 // GetLibSupportInfoOutputFile - Return a file stream to print our output on...
24 std::ostream *GetLibSupportInfoOutputFile();
26 unsigned StatisticBase::NumStats = 0;
28 // -stats - Command line option to cause transformations to emit stats about
32 Enabled("stats", cl::desc("Enable statistics output from program"));
36 const char *Name, *Desc;
38 StatRecord(const std::string V, const char *N, const char *D)
39 : Value(V), Name(N), Desc(D) {}
41 bool operator<(const StatRecord &SR) const {
42 return std::strcmp(Name, SR.Name) < 0;
45 void print(unsigned ValFieldSize, unsigned NameFieldSize,
47 OS << std::string(ValFieldSize-Value.length(), ' ')
48 << Value << " " << Name
49 << std::string(NameFieldSize-std::strlen(Name), ' ')
50 << " - " << Desc << "\n";
54 static std::vector<StatRecord> *AccumStats = 0;
56 // Print information when destroyed, iff command line option is specified
57 void StatisticBase::destroy() const {
58 if (Enabled && hasSomeData()) {
60 AccumStats = new std::vector<StatRecord>();
62 std::ostringstream Out;
64 AccumStats->push_back(StatRecord(Out.str(), Name, Desc));
67 if (--NumStats == 0 && AccumStats) {
68 std::ostream *OutStream = GetLibSupportInfoOutputFile();
70 // Figure out how long the biggest Value and Name fields are...
71 unsigned MaxNameLen = 0, MaxValLen = 0;
72 for (unsigned i = 0, e = AccumStats->size(); i != e; ++i) {
73 MaxValLen = std::max(MaxValLen,
74 (unsigned)(*AccumStats)[i].Value.length());
75 MaxNameLen = std::max(MaxNameLen,
76 (unsigned)std::strlen((*AccumStats)[i].Name));
80 std::stable_sort(AccumStats->begin(), AccumStats->end());
82 // Print out the statistics header...
83 *OutStream << "===" << std::string(73, '-') << "===\n"
84 << " ... Statistics Collected ...\n"
85 << "===" << std::string(73, '-') << "===\n\n";
87 // Print all of the statistics accumulated...
88 for (unsigned i = 0, e = AccumStats->size(); i != e; ++i)
89 (*AccumStats)[i].print(MaxValLen, MaxNameLen, *OutStream);
91 *OutStream << std::endl; // Flush the output stream...
93 // Free all accumulated statistics...
96 if (OutStream != &std::cerr && OutStream != &std::cout)
97 delete OutStream; // Close the file...