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