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//===-- llvm/Support/Timer.h - Interval Timing Support ----------*- 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 three classes: Timer, TimeRegion, and TimerGroup,
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_SUPPORT_TIMER_H
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#define LLVM_SUPPORT_TIMER_H
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#include "llvm/System/DataTypes.h"
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#include "llvm/ADT/StringRef.h"
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double WallTime; // Wall clock time elapsed in seconds
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double UserTime; // User time elapsed
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double SystemTime; // System time elapsed
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ssize_t MemUsed; // Memory allocated (in bytes)
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TimeRecord() : WallTime(0), UserTime(0), SystemTime(0), MemUsed(0) {}
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/// getCurrentTime - Get the current time and memory usage. If Start is true
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/// we get the memory usage before the time, otherwise we get time before
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/// memory usage. This matters if the time to get the memory usage is
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/// significant and shouldn't be counted as part of a duration.
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static TimeRecord getCurrentTime(bool Start = true);
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double getProcessTime() const { return UserTime+SystemTime; }
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double getUserTime() const { return UserTime; }
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double getSystemTime() const { return SystemTime; }
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double getWallTime() const { return WallTime; }
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ssize_t getMemUsed() const { return MemUsed; }
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// operator< - Allow sorting.
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bool operator<(const TimeRecord &T) const {
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// Sort by Wall Time elapsed, as it is the only thing really accurate
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return WallTime < T.WallTime;
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void operator+=(const TimeRecord &RHS) {
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WallTime += RHS.WallTime;
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UserTime += RHS.UserTime;
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SystemTime += RHS.SystemTime;
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MemUsed += RHS.MemUsed;
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void operator-=(const TimeRecord &RHS) {
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WallTime -= RHS.WallTime;
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UserTime -= RHS.UserTime;
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SystemTime -= RHS.SystemTime;
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MemUsed -= RHS.MemUsed;
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/// print - Print the current timer to standard error, and reset the "Started"
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void print(const TimeRecord &Total, raw_ostream &OS) const;
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/// Timer - This class is used to track the amount of time spent between
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/// invocations of its startTimer()/stopTimer() methods. Given appropriate OS
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/// support it can also keep track of the RSS of the program at various points.
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/// By default, the Timer will print the amount of time it has captured to
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/// standard error when the laster timer is destroyed, otherwise it is printed
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/// when its TimerGroup is destroyed. Timers do not print their information
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/// if they are never started.
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std::string Name; // The name of this time variable.
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bool Started; // Has this time variable ever been started?
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TimerGroup *TG; // The TimerGroup this Timer is in.
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Timer **Prev, *Next; // Doubly linked list of timers in the group.
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explicit Timer(StringRef N) : TG(0) { init(N); }
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Timer(StringRef N, TimerGroup &tg) : TG(0) { init(N, tg); }
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Timer(const Timer &RHS) : TG(0) {
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assert(RHS.TG == 0 && "Can only copy uninitialized timers");
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const Timer &operator=(const Timer &T) {
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assert(TG == 0 && T.TG == 0 && "Can only assign uninit timers");
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// Create an uninitialized timer, client must use 'init'.
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explicit Timer() : TG(0) {}
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void init(StringRef N);
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void init(StringRef N, TimerGroup &tg);
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const std::string &getName() const { return Name; }
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bool isInitialized() const { return TG != 0; }
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/// startTimer - Start the timer running. Time between calls to
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/// startTimer/stopTimer is counted by the Timer class. Note that these calls
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/// must be correctly paired.
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/// stopTimer - Stop the timer.
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friend class TimerGroup;
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/// The TimeRegion class is used as a helper class to call the startTimer() and
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/// stopTimer() methods of the Timer class. When the object is constructed, it
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/// starts the timer specified as it's argument. When it is destroyed, it stops
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/// the relevant timer. This makes it easy to time a region of code.
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TimeRegion(const TimeRegion &); // DO NOT IMPLEMENT
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explicit TimeRegion(Timer &t) : T(&t) {
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explicit TimeRegion(Timer *t) : T(t) {
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if (T) T->startTimer();
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if (T) T->stopTimer();
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/// NamedRegionTimer - This class is basically a combination of TimeRegion and
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/// Timer. It allows you to declare a new timer, AND specify the region to
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/// time, all in one statement. All timers with the same name are merged. This
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/// is primarily used for debugging and for hunting performance problems.
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struct NamedRegionTimer : public TimeRegion {
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explicit NamedRegionTimer(StringRef Name,
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bool Enabled = true);
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explicit NamedRegionTimer(StringRef Name, StringRef GroupName,
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bool Enabled = true);
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/// The TimerGroup class is used to group together related timers into a single
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/// report that is printed when the TimerGroup is destroyed. It is illegal to
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/// destroy a TimerGroup object before all of the Timers in it are gone. A
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/// TimerGroup can be specified for a newly created timer in its constructor.
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Timer *FirstTimer; // First timer in the group.
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std::vector<std::pair<TimeRecord, std::string> > TimersToPrint;
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TimerGroup **Prev, *Next; // Doubly linked list of TimerGroup's.
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TimerGroup(const TimerGroup &TG); // DO NOT IMPLEMENT
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void operator=(const TimerGroup &TG); // DO NOT IMPLEMENT
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explicit TimerGroup(StringRef name);
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void setName(StringRef name) { Name.assign(name.begin(), name.end()); }
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/// print - Print any started timers in this group and zero them.
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void print(raw_ostream &OS);
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/// printAll - This static method prints all timers and clears them all out.
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static void printAll(raw_ostream &OS);
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void addTimer(Timer &T);
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void removeTimer(Timer &T);
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void PrintQueuedTimers(raw_ostream &OS);
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} // End llvm namespace