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108 lines
3.7 KiB
C++
108 lines
3.7 KiB
C++
//===-- Statistic.cpp - Easy way to expose stats information --------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the 'Statistic' class, which is designed to be an easy
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// way to expose various success metrics from passes. These statistics are
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// printed at the end of a run, when the -stats command line option is enabled
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// on the command line.
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//
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// This is useful for reporting information like the number of instructions
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// simplified, optimized or removed by various transformations, like this:
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//
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// static Statistic<> NumInstEliminated("GCSE - Number of instructions killed");
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//
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// Later, in the code: ++NumInstEliminated;
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/ADT/Statistic.h"
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#include "llvm/Support/CommandLine.h"
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#include <sstream>
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#include <iostream>
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#include <algorithm>
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using namespace llvm;
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// GetLibSupportInfoOutputFile - Return a file stream to print our output on...
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namespace llvm { extern std::ostream *GetLibSupportInfoOutputFile(); }
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unsigned StatisticBase::NumStats = 0;
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// -stats - Command line option to cause transformations to emit stats about
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// what they did.
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//
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static cl::opt<bool>
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Enabled("stats", cl::desc("Enable statistics output from program"));
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struct StatRecord {
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std::string Value;
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const char *Name, *Desc;
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StatRecord(const std::string &V, const char *N, const char *D)
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: Value(V), Name(N), Desc(D) {}
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bool operator<(const StatRecord &SR) const {
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return std::strcmp(Name, SR.Name) < 0;
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}
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void print(unsigned ValFieldSize, unsigned NameFieldSize,
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std::ostream &OS) {
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OS << std::string(ValFieldSize-Value.length(), ' ')
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<< Value << " " << Name
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<< std::string(NameFieldSize-std::strlen(Name), ' ')
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<< " - " << Desc << "\n";
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}
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};
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static std::vector<StatRecord> *AccumStats = 0;
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// Print information when destroyed, iff command line option is specified
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void StatisticBase::destroy() const {
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if (Enabled && hasSomeData()) {
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if (AccumStats == 0)
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AccumStats = new std::vector<StatRecord>();
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std::ostringstream Out;
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printValue(Out);
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AccumStats->push_back(StatRecord(Out.str(), Name, Desc));
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}
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if (--NumStats == 0 && AccumStats) {
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std::ostream *OutStream = GetLibSupportInfoOutputFile();
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// Figure out how long the biggest Value and Name fields are...
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unsigned MaxNameLen = 0, MaxValLen = 0;
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for (unsigned i = 0, e = AccumStats->size(); i != e; ++i) {
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MaxValLen = std::max(MaxValLen,
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(unsigned)(*AccumStats)[i].Value.length());
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MaxNameLen = std::max(MaxNameLen,
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(unsigned)std::strlen((*AccumStats)[i].Name));
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}
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// Sort the fields...
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std::stable_sort(AccumStats->begin(), AccumStats->end());
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// Print out the statistics header...
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*OutStream << "===" << std::string(73, '-') << "===\n"
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<< " ... Statistics Collected ...\n"
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<< "===" << std::string(73, '-') << "===\n\n";
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// Print all of the statistics accumulated...
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for (unsigned i = 0, e = AccumStats->size(); i != e; ++i)
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(*AccumStats)[i].print(MaxValLen, MaxNameLen, *OutStream);
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*OutStream << std::endl; // Flush the output stream...
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// Free all accumulated statistics...
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delete AccumStats;
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AccumStats = 0;
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if (OutStream != &std::cerr && OutStream != &std::cout)
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delete OutStream; // Close the file...
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}
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}
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