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133 lines
4.3 KiB
C++
133 lines
4.3 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 is distributed under the University of Illinois Open Source
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// 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 "llvm/Support/ManagedStatic.h"
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#include "llvm/Support/Streams.h"
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#include "llvm/System/Mutex.h"
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#include "llvm/ADT/StringExtras.h"
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#include <algorithm>
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#include <ostream>
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#include <cstring>
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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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/// -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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namespace {
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/// StatisticInfo - This class is used in a ManagedStatic so that it is created
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/// on demand (when the first statistic is bumped) and destroyed only when
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/// llvm_shutdown is called. We print statistics from the destructor.
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class StatisticInfo {
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std::vector<const Statistic*> Stats;
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public:
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~StatisticInfo();
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void addStatistic(const Statistic *S) {
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Stats.push_back(S);
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}
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};
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}
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static ManagedStatic<StatisticInfo> StatInfo;
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static ManagedStatic<sys::Mutex> StatLock;
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/// RegisterStatistic - The first time a statistic is bumped, this method is
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/// called.
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void Statistic::RegisterStatistic() {
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// If stats are enabled, inform StatInfo that this statistic should be
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// printed.
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sys::ScopedLock Writer(*StatLock);
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if (!Initialized) {
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if (Enabled)
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StatInfo->addStatistic(this);
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sys::MemoryFence();
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// Remember we have been registered.
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Initialized = true;
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}
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}
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namespace {
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struct NameCompare {
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bool operator()(const Statistic *LHS, const Statistic *RHS) const {
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int Cmp = std::strcmp(LHS->getName(), RHS->getName());
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if (Cmp != 0) return Cmp < 0;
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// Secondary key is the description.
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return std::strcmp(LHS->getDesc(), RHS->getDesc()) < 0;
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}
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};
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}
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// Print information when destroyed, iff command line option is specified.
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StatisticInfo::~StatisticInfo() {
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// Statistics not enabled?
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if (Stats.empty()) return;
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// Get the stream to write to.
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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 (size_t i = 0, e = Stats.size(); i != e; ++i) {
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MaxValLen = std::max(MaxValLen,
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(unsigned)utostr(Stats[i]->getValue()).size());
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MaxNameLen = std::max(MaxNameLen,
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(unsigned)std::strlen(Stats[i]->getName()));
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}
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// Sort the fields by name.
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std::stable_sort(Stats.begin(), Stats.end(), NameCompare());
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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.
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for (size_t i = 0, e = Stats.size(); i != e; ++i) {
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std::string CountStr = utostr(Stats[i]->getValue());
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OutStream << std::string(MaxValLen-CountStr.size(), ' ')
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<< CountStr << " " << Stats[i]->getName()
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<< std::string(MaxNameLen-std::strlen(Stats[i]->getName()), ' ')
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<< " - " << Stats[i]->getDesc() << "\n";
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}
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OutStream << std::endl; // Flush the output stream...
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if (&OutStream != cerr.stream() && &OutStream != cout.stream())
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delete &OutStream; // Close the file.
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}
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