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//===-- llvm/ADT/Statistic.h - Easy way to expose stats ---------*- C++ -*-===//
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// The LLVM Compiler Infrastructure
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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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// This file defines the 'Statistic' class, which is designed to be an easy way
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// to expose various metrics from passes. These statistics are printed at the
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// end of a run (from llvm_shutdown), when the -stats command line option is
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// passed on the command line.
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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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// static Statistic NumInstsKilled("gcse", "Number of instructions killed");
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// Later, in the code: ++NumInstsKilled;
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// NOTE: Statistics *must* be declared as global variables.
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_ADT_STATISTIC_H
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#define LLVM_ADT_STATISTIC_H
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#include "llvm/Support/Atomic.h"
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#include "llvm/Support/Valgrind.h"
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volatile llvm::sys::cas_flag Value;
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llvm::sys::cas_flag getValue() const { return Value; }
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const char *getName() const { return Name; }
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const char *getDesc() const { return Desc; }
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/// construct - This should only be called for non-global statistics.
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void construct(const char *name, const char *desc) {
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Name = name; Desc = desc;
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Value = 0; Initialized = false;
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// Allow use of this class as the value itself.
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operator unsigned() const { return Value; }
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#if !defined(NDEBUG) || defined(LLVM_ENABLE_STATS)
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const Statistic &operator=(unsigned Val) {
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const Statistic &operator++() {
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// FIXME: This function and all those that follow carefully use an
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// atomic operation to update the value safely in the presence of
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// concurrent accesses, but not to read the return value, so the
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// return value is not thread safe.
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sys::AtomicIncrement(&Value);
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unsigned operator++(int) {
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unsigned OldValue = Value;
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sys::AtomicIncrement(&Value);
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const Statistic &operator--() {
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sys::AtomicDecrement(&Value);
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unsigned operator--(int) {
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unsigned OldValue = Value;
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sys::AtomicDecrement(&Value);
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const Statistic &operator+=(const unsigned &V) {
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sys::AtomicAdd(&Value, V);
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const Statistic &operator-=(const unsigned &V) {
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sys::AtomicAdd(&Value, -V);
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const Statistic &operator*=(const unsigned &V) {
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sys::AtomicMul(&Value, V);
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const Statistic &operator/=(const unsigned &V) {
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sys::AtomicDiv(&Value, V);
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#else // Statistics are disabled in release builds.
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const Statistic &operator=(unsigned Val) {
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const Statistic &operator++() {
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unsigned operator++(int) {
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const Statistic &operator--() {
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unsigned operator--(int) {
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const Statistic &operator+=(const unsigned &V) {
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const Statistic &operator-=(const unsigned &V) {
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const Statistic &operator*=(const unsigned &V) {
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const Statistic &operator/=(const unsigned &V) {
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#endif // !defined(NDEBUG) || defined(LLVM_ENABLE_STATS)
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bool tmp = Initialized;
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if (!tmp) RegisterStatistic();
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TsanHappensAfter(this);
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void RegisterStatistic();
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// STATISTIC - A macro to make definition of statistics really simple. This
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// automatically passes the DEBUG_TYPE of the file into the statistic.
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#define STATISTIC(VARNAME, DESC) \
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static llvm::Statistic VARNAME = { DEBUG_TYPE, DESC, 0, 0 }
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/// \brief Enable the collection and printing of statistics.
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void EnableStatistics();
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/// \brief Check if statistics are enabled.
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bool AreStatisticsEnabled();
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/// \brief Print statistics to the file returned by CreateInfoOutputFile().
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void PrintStatistics();
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/// \brief Print statistics to the given output stream.
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void PrintStatistics(raw_ostream &OS);
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} // End llvm namespace