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//===-- llvm/ADT/Statistic.h - Easy way to expose stats ---------*- C++ -*-===//
//
// 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 defines the 'Statistic' class, which is designed to be an easy way
// to expose various metrics from passes. These statistics are printed at the
// end of a run (from llvm_shutdown), when the -stats command line option is
// passed 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 NumInstsKilled("gcse", "Number of instructions killed");
//
// Later, in the code: ++NumInstsKilled;
//
// NOTE: Statistics *must* be declared as global variables.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_ADT_STATISTIC_H
#define LLVM_ADT_STATISTIC_H
namespace llvm {
class Statistic {
const char *Name;
const char *Desc;
unsigned Value : 31;
bool Initialized : 1;
public:
// Normal constructor, default initialize data item...
Statistic(const char *name, const char *desc)
: Name(name), Desc(desc), Value(0), Initialized(0) {
}
unsigned getValue() const { return Value; }
const char *getName() const { return Name; }
const char *getDesc() const { return Desc; }
// Allow use of this class as the value itself.
operator unsigned() const { return Value; }
const Statistic &operator=(unsigned Val) { Value = Val; return init(); }
const Statistic &operator++() { ++Value; return init(); }
unsigned operator++(int) { init(); return Value++; }
const Statistic &operator--() { --Value; return init(); }
unsigned operator--(int) { init(); return Value--; }
const Statistic &operator+=(const unsigned &V) { Value += V; return init(); }
const Statistic &operator-=(const unsigned &V) { Value -= V; return init(); }
const Statistic &operator*=(const unsigned &V) { Value *= V; return init(); }
const Statistic &operator/=(const unsigned &V) { Value /= V; return init(); }
private:
Statistic &init() {
if (!Initialized) RegisterStatistic();
return *this;
}
void RegisterStatistic();
};
} // End llvm namespace
#endif
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