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86 lines
3.0 KiB
C++
86 lines
3.0 KiB
C++
//===-- Support/Statistic.h - Easy way to expose stats ----------*- C++ -*-===//
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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 defines the 'Statistic' class, which is designed to be an easy way
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// to expose various success metrics from passes. These statistics are printed
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// at the end of a run, when the -stats command line option is enabled on the
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// 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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#ifndef SUPPORT_STATISTIC_H
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#define SUPPORT_STATISTIC_H
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#include <iosfwd>
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namespace llvm {
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// StatisticBase - Nontemplated base class for Statistic<> class...
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class StatisticBase {
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const char *Name;
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const char *Desc;
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static unsigned NumStats;
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protected:
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StatisticBase(const char *name, const char *desc) : Name(name), Desc(desc) {
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++NumStats; // Keep track of how many stats are created...
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}
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virtual ~StatisticBase() {}
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// destroy - Called by subclass dtor so that we can still invoke virtual
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// functions on the subclass.
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void destroy() const;
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// printValue - Overridden by template class to print out the value type...
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virtual void printValue(std::ostream &o) const = 0;
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// hasSomeData - Return true if some data has been aquired. Avoid printing
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// lots of zero counts.
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//
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virtual bool hasSomeData() const = 0;
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};
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// Statistic Class - templated on the data type we are monitoring...
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template <typename DataType=unsigned>
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class Statistic : private StatisticBase {
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DataType Value;
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virtual void printValue(std::ostream &o) const { o << Value; }
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virtual bool hasSomeData() const { return Value != DataType(); }
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public:
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// Normal constructor, default initialize data item...
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Statistic(const char *name, const char *desc)
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: StatisticBase(name, desc), Value(DataType()) {}
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// Constructor to provide an initial value...
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Statistic(const DataType &Val, const char *name, const char *desc)
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: StatisticBase(name, desc), Value(Val) {}
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// Print information when destroyed, iff command line option is specified
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~Statistic() { destroy(); }
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// Allow use of this class as the value itself...
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operator DataType() const { return Value; }
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const Statistic &operator=(DataType Val) { Value = Val; return *this; }
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const Statistic &operator++() { ++Value; return *this; }
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DataType operator++(int) { return Value++; }
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const Statistic &operator+=(const DataType &V) { Value += V; return *this; }
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const Statistic &operator-=(const DataType &V) { Value -= V; return *this; }
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};
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} // End llvm namespace
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#endif
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