//===- PassTimingInfo.h - pass execution timing -----------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
/// \file
///
/// This header defines classes/functions to handle pass execution timing
/// information with interfaces for both pass managers.
///
//===----------------------------------------------------------------------===//
#ifndef LLVM_IR_PASSTIMINGINFO_H
#define LLVM_IR_PASSTIMINGINFO_H
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/StringMap.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/Support/Timer.h"
#include <memory>
#include <utility>
namespace llvm {
class Pass;
class PassInstrumentationCallbacks;
class raw_ostream;
/// If -time-passes has been specified, report the timings immediately and then
/// reset the timers to zero. By default it uses the stream created by
/// CreateInfoOutputFile().
void reportAndResetTimings(raw_ostream *OutStream = nullptr);
/// Request the timer for this legacy-pass-manager's pass instance.
Timer *getPassTimer(Pass *);
/// This class implements -time-passes functionality for new pass manager.
/// It provides the pass-instrumentation callbacks that measure the pass
/// execution time. They collect timing info into individual timers as
/// passes are being run. At the end of its life-time it prints the resulting
/// timing report.
class TimePassesHandler {
/// Value of this type is capable of uniquely identifying pass invocations.
/// It is a pair of string Pass-Identifier (which for now is common
/// to all the instance of a given pass) + sequential invocation counter.
using PassInvocationID = std::pair<StringRef, unsigned>;
/// Groups of timers for passes and analyses.
TimerGroup PassTG;
TimerGroup AnalysisTG;
using TimerVector = llvm::SmallVector<std::unique_ptr<Timer>, 4>;
/// Map of timers for pass invocations
StringMap<TimerVector> TimingData;
/// Currently active pass timer.
Timer *ActivePassTimer = nullptr;
/// Stack of currently active analysis timers. Analyses can request other
/// analyses.
SmallVector<Timer *, 8> AnalysisActiveTimerStack;
/// Custom output stream to print timing information into.
/// By default (== nullptr) we emit time report into the stream created by
/// CreateInfoOutputFile().
raw_ostream *OutStream = nullptr;
bool Enabled;
bool PerRun;
public:
TimePassesHandler();
TimePassesHandler(bool Enabled, bool PerRun = false);
/// Destructor handles the print action if it has not been handled before.
~TimePassesHandler() { print(); }
/// Prints out timing information and then resets the timers.
void print();
// We intend this to be unique per-compilation, thus no copies.
TimePassesHandler(const TimePassesHandler &) = delete;
void operator=(const TimePassesHandler &) = delete;
void registerCallbacks(PassInstrumentationCallbacks &PIC);
/// Set a custom output stream for subsequent reporting.
void setOutStream(raw_ostream &OutStream);
private:
/// Dumps information for running/triggered timers, useful for debugging
LLVM_DUMP_METHOD void dump() const;
/// Returns the new timer for each new run of the pass.
Timer &getPassTimer(StringRef PassID, bool IsPass);
void startAnalysisTimer(StringRef PassID);
void stopAnalysisTimer(StringRef PassID);
void startPassTimer(StringRef PassID);
void stopPassTimer(StringRef PassID);
};
} // namespace llvm
#endif