//===-- llvm/Support/Timer.h - Interval Timing Support ----------*- 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.
-//
-//===----------------------------------------------------------------------===//
+// The LLVM Compiler Infrastructure
//
-// This file defines three classes: Timer, TimeRegion, and TimerGroup,
-// documented below.
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_SUPPORT_TIMER_H
#define LLVM_SUPPORT_TIMER_H
-#include <llvm/Support/DataTypes.h>
+#include "llvm/ADT/StringRef.h"
+#include "llvm/Support/DataTypes.h"
+#include <cassert>
#include <string>
+#include <utility>
#include <vector>
-#include <iosfwd>
-#include <cassert>
namespace llvm {
+class Timer;
class TimerGroup;
+class raw_ostream;
+
+class TimeRecord {
+ double WallTime; // Wall clock time elapsed in seconds
+ double UserTime; // User time elapsed
+ double SystemTime; // System time elapsed
+ ssize_t MemUsed; // Memory allocated (in bytes)
+public:
+ TimeRecord() : WallTime(0), UserTime(0), SystemTime(0), MemUsed(0) {}
+
+ /// getCurrentTime - Get the current time and memory usage. If Start is true
+ /// we get the memory usage before the time, otherwise we get time before
+ /// memory usage. This matters if the time to get the memory usage is
+ /// significant and shouldn't be counted as part of a duration.
+ static TimeRecord getCurrentTime(bool Start = true);
+
+ double getProcessTime() const { return UserTime + SystemTime; }
+ double getUserTime() const { return UserTime; }
+ double getSystemTime() const { return SystemTime; }
+ double getWallTime() const { return WallTime; }
+ ssize_t getMemUsed() const { return MemUsed; }
+
+ // operator< - Allow sorting.
+ bool operator<(const TimeRecord &T) const {
+ // Sort by Wall Time elapsed, as it is the only thing really accurate
+ return WallTime < T.WallTime;
+ }
+
+ void operator+=(const TimeRecord &RHS) {
+ WallTime += RHS.WallTime;
+ UserTime += RHS.UserTime;
+ SystemTime += RHS.SystemTime;
+ MemUsed += RHS.MemUsed;
+ }
+ void operator-=(const TimeRecord &RHS) {
+ WallTime -= RHS.WallTime;
+ UserTime -= RHS.UserTime;
+ SystemTime -= RHS.SystemTime;
+ MemUsed -= RHS.MemUsed;
+ }
+
+ /// print - Print the current timer to standard error, and reset the "Started"
+ /// flag.
+ void print(const TimeRecord &Total, raw_ostream &OS) const;
+};
/// Timer - This class is used to track the amount of time spent between
-/// invocations of it's startTimer()/stopTimer() methods. Given appropriate OS
+/// invocations of its startTimer()/stopTimer() methods. Given appropriate OS
/// support it can also keep track of the RSS of the program at various points.
/// By default, the Timer will print the amount of time it has captured to
-/// standard error when the laster timer is destroyed, otherwise it is printed
-/// when it's TimerGroup is destroyed. Timer's do not print their information
+/// standard error when the last timer is destroyed, otherwise it is printed
+/// when its TimerGroup is destroyed. Timers do not print their information
/// if they are never started.
///
class Timer {
- double Elapsed; // Wall clock time elapsed in seconds
- double UserTime; // User time elapsed
- double SystemTime; // System time elapsed
- ssize_t MemUsed; // Memory allocated (in bytes)
- size_t PeakMem; // Peak memory used
- size_t PeakMemBase; // Temporary for peak calculation...
- std::string Name; // The name of this time variable
+ TimeRecord Time;
+ std::string Name; // The name of this time variable.
bool Started; // Has this time variable ever been started?
TimerGroup *TG; // The TimerGroup this Timer is in.
-public:
- Timer(const std::string &N);
- Timer(const std::string &N, TimerGroup &tg);
- Timer(const Timer &T);
- ~Timer();
-
- double getProcessTime() const { return UserTime+SystemTime; }
- double getWallTime() const { return Elapsed; }
- ssize_t getMemUsed() const { return MemUsed; }
- size_t getPeakMem() const { return PeakMem; }
- std::string getName() const { return Name; }
+ Timer **Prev, *Next; // Doubly linked list of timers in the group.
+public:
+ explicit Timer(StringRef N) : TG(nullptr) { init(N); }
+ Timer(StringRef N, TimerGroup &tg) : TG(nullptr) { init(N, tg); }
+ Timer(const Timer &RHS) : TG(nullptr) {
+ assert(!RHS.TG && "Can only copy uninitialized timers");
+ }
const Timer &operator=(const Timer &T) {
- Elapsed = T.Elapsed;
- UserTime = T.UserTime;
- SystemTime = T.SystemTime;
- MemUsed = T.MemUsed;
- PeakMem = T.PeakMem;
- PeakMemBase = T.PeakMemBase;
- Name = T.Name;
- Started = T.Started;
- assert(TG == T.TG && "Can only assign timers in the same TimerGroup!");
+ assert(!TG && !T.TG && "Can only assign uninit timers");
return *this;
}
+ ~Timer();
+
+ // Create an uninitialized timer, client must use 'init'.
+ explicit Timer() : TG(nullptr) {}
+ void init(StringRef N);
+ void init(StringRef N, TimerGroup &tg);
+
+ const std::string &getName() const { return Name; }
+ bool isInitialized() const { return TG != nullptr; }
- // operator< - Allow sorting...
- bool operator<(const Timer &T) const {
- // Sort by Wall Time elapsed, as it is the only thing really accurate
- return Elapsed < T.Elapsed;
- }
- bool operator>(const Timer &T) const { return T.operator<(*this); }
-
/// startTimer - Start the timer running. Time between calls to
/// startTimer/stopTimer is counted by the Timer class. Note that these calls
/// must be correctly paired.
///
void stopTimer();
- /// addPeakMemoryMeasurement - This method should be called whenever memory
- /// usage needs to be checked. It adds a peak memory measurement to the
- /// currently active timers, which will be printed when the timer group prints
- ///
- static void addPeakMemoryMeasurement();
-
- /// print - Print the current timer to standard error, and reset the "Started"
- /// flag.
- void print(const Timer &Total, std::ostream &OS);
-
private:
friend class TimerGroup;
-
- // Copy ctor, initialize with no TG member.
- Timer(bool, const Timer &T);
-
- /// sum - Add the time accumulated in the specified timer into this timer.
- ///
- void sum(const Timer &T);
};
-
/// The TimeRegion class is used as a helper class to call the startTimer() and
/// stopTimer() methods of the Timer class. When the object is constructed, it
-/// starts the timer specified as it's argument. When it is destroyed, it stops
+/// starts the timer specified as its argument. When it is destroyed, it stops
/// the relevant timer. This makes it easy to time a region of code.
///
class TimeRegion {
- Timer &T;
- TimeRegion(const TimeRegion &); // DO NOT IMPLEMENT
+ Timer *T;
+ TimeRegion(const TimeRegion &) = delete;
+
public:
- TimeRegion(Timer &t) : T(t) {
- T.startTimer();
+ explicit TimeRegion(Timer &t) : T(&t) {
+ T->startTimer();
+ }
+ explicit TimeRegion(Timer *t) : T(t) {
+ if (T) T->startTimer();
}
~TimeRegion() {
- T.stopTimer();
+ if (T) T->stopTimer();
}
};
-
/// NamedRegionTimer - This class is basically a combination of TimeRegion and
/// Timer. It allows you to declare a new timer, AND specify the region to
/// time, all in one statement. All timers with the same name are merged. This
/// is primarily used for debugging and for hunting performance problems.
///
struct NamedRegionTimer : public TimeRegion {
- NamedRegionTimer(const std::string &Name);
+ explicit NamedRegionTimer(StringRef Name,
+ bool Enabled = true);
+ explicit NamedRegionTimer(StringRef Name, StringRef GroupName,
+ bool Enabled = true);
};
-
/// The TimerGroup class is used to group together related timers into a single
/// report that is printed when the TimerGroup is destroyed. It is illegal to
/// destroy a TimerGroup object before all of the Timers in it are gone. A
///
class TimerGroup {
std::string Name;
- unsigned NumTimers;
- std::vector<Timer> TimersToPrint;
+ Timer *FirstTimer; // First timer in the group.
+ std::vector<std::pair<TimeRecord, std::string>> TimersToPrint;
+
+ TimerGroup **Prev, *Next; // Doubly linked list of TimerGroup's.
+ TimerGroup(const TimerGroup &TG) = delete;
+ void operator=(const TimerGroup &TG) = delete;
+
public:
- TimerGroup(const std::string &name) : Name(name), NumTimers(0) {}
- ~TimerGroup() {
- assert(NumTimers == 0 &&
- "TimerGroup destroyed before all contained timers!");
- }
+ explicit TimerGroup(StringRef name);
+ ~TimerGroup();
+
+ void setName(StringRef name) { Name.assign(name.begin(), name.end()); }
+
+ /// print - Print any started timers in this group and zero them.
+ void print(raw_ostream &OS);
+
+ /// printAll - This static method prints all timers and clears them all out.
+ static void printAll(raw_ostream &OS);
private:
friend class Timer;
- void addTimer() { ++NumTimers; }
- void removeTimer();
- void addTimerToPrint(const Timer &T) {
- TimersToPrint.push_back(Timer(true, T));
- }
+ void addTimer(Timer &T);
+ void removeTimer(Timer &T);
+ void PrintQueuedTimers(raw_ostream &OS);
};
} // End llvm namespace
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