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//===- PassTimingInfo.cpp - LLVM Pass Timing Implementation ---------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
//
// This file implements the LLVM Pass Timing infrastructure for both
// new and legacy pass managers.
//
// PassTimingInfo Class - This class is used to calculate information about the
// amount of time each pass takes to execute. This only happens when
// -time-passes is enabled on the command line.
//
//===----------------------------------------------------------------------===//
#include "llvm/IR/PassTimingInfo.h"
#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/IR/PassInstrumentation.h"
#include "llvm/Pass.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/FormatVariadic.h"
#include "llvm/Support/ManagedStatic.h"
#include "llvm/Support/Mutex.h"
#include "llvm/Support/Timer.h"
#include "llvm/Support/raw_ostream.h"
#include <memory>
#include <string>
using namespace llvm;
#define DEBUG_TYPE "time-passes"
namespace llvm {
bool TimePassesIsEnabled = false;
static cl::opt<bool, true> EnableTiming(
"time-passes", cl::location(TimePassesIsEnabled), cl::Hidden,
cl::desc("Time each pass, printing elapsed time for each on exit"));
namespace {
namespace legacy {
//===----------------------------------------------------------------------===//
// Legacy pass manager's PassTimingInfo implementation
/// Provides an interface for collecting pass timing information.
///
/// It was intended to be generic but now we decided to split
/// interfaces completely. This is now exclusively for legacy-pass-manager use.
class PassTimingInfo {
public:
using PassInstanceID = void *;
private:
StringMap<unsigned> PassIDCountMap; ///< Map that counts instances of passes
DenseMap<PassInstanceID, std::unique_ptr<Timer>> TimingData; ///< timers for pass instances
TimerGroup TG;
public:
/// Default constructor for yet-inactive timeinfo.
/// Use \p init() to activate it.
PassTimingInfo();
/// Print out timing information and release timers.
~PassTimingInfo();
/// Initializes the static \p TheTimeInfo member to a non-null value when
/// -time-passes is enabled. Leaves it null otherwise.
///
/// This method may be called multiple times.
static void init();
/// Prints out timing information and then resets the timers.
/// By default it uses the stream created by CreateInfoOutputFile().
void print(raw_ostream *OutStream = nullptr);
/// Returns the timer for the specified pass if it exists.
Timer *getPassTimer(Pass *, PassInstanceID);
static PassTimingInfo *TheTimeInfo;
private:
Timer *newPassTimer(StringRef PassID, StringRef PassDesc);
};
static ManagedStatic<sys::SmartMutex<true>> TimingInfoMutex;
PassTimingInfo::PassTimingInfo()
: TG("pass", "... Pass execution timing report ...") {}
PassTimingInfo::~PassTimingInfo() {
// Deleting the timers accumulates their info into the TG member.
// Then TG member is (implicitly) deleted, actually printing the report.
TimingData.clear();
}
void PassTimingInfo::init() {
if (!TimePassesIsEnabled || TheTimeInfo)
return;
// Constructed the first time this is called, iff -time-passes is enabled.
// This guarantees that the object will be constructed after static globals,
// thus it will be destroyed before them.
static ManagedStatic<PassTimingInfo> TTI;
TheTimeInfo = &*TTI;
}
/// Prints out timing information and then resets the timers.
void PassTimingInfo::print(raw_ostream *OutStream) {
TG.print(OutStream ? *OutStream : *CreateInfoOutputFile(), true);
}
Timer *PassTimingInfo::newPassTimer(StringRef PassID, StringRef PassDesc) {
unsigned &num = PassIDCountMap[PassID];
num++;
// Appending description with a pass-instance number for all but the first one
std::string PassDescNumbered =
num <= 1 ? PassDesc.str() : formatv("{0} #{1}", PassDesc, num).str();
return new Timer(PassID, PassDescNumbered, TG);
}
Timer *PassTimingInfo::getPassTimer(Pass *P, PassInstanceID Pass) {
if (P->getAsPMDataManager())
return nullptr;
init();
sys::SmartScopedLock<true> Lock(*TimingInfoMutex);
std::unique_ptr<Timer> &T = TimingData[Pass];
if (!T) {
StringRef PassName = P->getPassName();
StringRef PassArgument;
if (const PassInfo *PI = Pass::lookupPassInfo(P->getPassID()))
PassArgument = PI->getPassArgument();
T.reset(newPassTimer(PassArgument.empty() ? PassName : PassArgument, PassName));
}
return T.get();
}
PassTimingInfo *PassTimingInfo::TheTimeInfo;
} // namespace legacy
} // namespace
Timer *getPassTimer(Pass *P) {
legacy::PassTimingInfo::init();
if (legacy::PassTimingInfo::TheTimeInfo)
return legacy::PassTimingInfo::TheTimeInfo->getPassTimer(P, P);
return nullptr;
}
/// If timing is enabled, report the times collected up to now and then reset
/// them.
void reportAndResetTimings(raw_ostream *OutStream) {
if (legacy::PassTimingInfo::TheTimeInfo)
legacy::PassTimingInfo::TheTimeInfo->print(OutStream);
}
//===----------------------------------------------------------------------===//
// Pass timing handling for the New Pass Manager
//===----------------------------------------------------------------------===//
/// Returns the timer for the specified pass invocation of \p PassID.
/// Each time it creates a new timer.
Timer &TimePassesHandler::getPassTimer(StringRef PassID) {
// Bump counts for each request of the timer.
unsigned Count = nextPassID(PassID);
// Unconditionally appending description with a pass-invocation number.
std::string FullDesc = formatv("{0} #{1}", PassID, Count).str();
PassInvocationID UID{PassID, Count};
Timer *T = new Timer(PassID, FullDesc, TG);
auto Pair = TimingData.try_emplace(UID, T);
assert(Pair.second && "should always create a new timer");
return *(Pair.first->second.get());
}
TimePassesHandler::TimePassesHandler(bool Enabled)
: TG("pass", "... Pass execution timing report ..."), Enabled(Enabled) {}
void TimePassesHandler::setOutStream(raw_ostream &Out) {
OutStream = &Out;
}
void TimePassesHandler::print() {
if (!Enabled)
return;
TG.print(OutStream ? *OutStream : *CreateInfoOutputFile(), true);
}
LLVM_DUMP_METHOD void TimePassesHandler::dump() const {
dbgs() << "Dumping timers for " << getTypeName<TimePassesHandler>()
<< ":\n\tRunning:\n";
for (auto &I : TimingData) {
const Timer *MyTimer = I.second.get();
if (!MyTimer || MyTimer->isRunning())
dbgs() << "\tTimer " << MyTimer << " for pass " << I.first.first << "("
<< I.first.second << ")\n";
}
dbgs() << "\tTriggered:\n";
for (auto &I : TimingData) {
const Timer *MyTimer = I.second.get();
if (!MyTimer || (MyTimer->hasTriggered() && !MyTimer->isRunning()))
dbgs() << "\tTimer " << MyTimer << " for pass " << I.first.first << "("
<< I.first.second << ")\n";
}
}
void TimePassesHandler::startTimer(StringRef PassID) {
Timer &MyTimer = getPassTimer(PassID);
TimerStack.push_back(&MyTimer);
if (!MyTimer.isRunning())
MyTimer.startTimer();
}
void TimePassesHandler::stopTimer(StringRef PassID) {
assert(TimerStack.size() > 0 && "empty stack in popTimer");
Timer *MyTimer = TimerStack.pop_back_val();
assert(MyTimer && "timer should be present");
if (MyTimer->isRunning())
MyTimer->stopTimer();
}
static bool matchPassManager(StringRef PassID) {
size_t prefix_pos = PassID.find('<');
if (prefix_pos == StringRef::npos)
return false;
StringRef Prefix = PassID.substr(0, prefix_pos);
return Prefix.endswith("PassManager") || Prefix.endswith("PassAdaptor") ||
Prefix.endswith("AnalysisManagerProxy");
}
bool TimePassesHandler::runBeforePass(StringRef PassID) {
if (matchPassManager(PassID))
return true;
startTimer(PassID);
LLVM_DEBUG(dbgs() << "after runBeforePass(" << PassID << ")\n");
LLVM_DEBUG(dump());
// we are not going to skip this pass, thus return true.
return true;
}
void TimePassesHandler::runAfterPass(StringRef PassID) {
if (matchPassManager(PassID))
return;
stopTimer(PassID);
LLVM_DEBUG(dbgs() << "after runAfterPass(" << PassID << ")\n");
LLVM_DEBUG(dump());
}
void TimePassesHandler::registerCallbacks(PassInstrumentationCallbacks &PIC) {
if (!Enabled)
return;
PIC.registerBeforePassCallback(
[this](StringRef P, Any) { return this->runBeforePass(P); });
PIC.registerAfterPassCallback(
[this](StringRef P, Any) { this->runAfterPass(P); });
PIC.registerAfterPassInvalidatedCallback(
[this](StringRef P) { this->runAfterPass(P); });
PIC.registerBeforeAnalysisCallback(
[this](StringRef P, Any) { this->runBeforePass(P); });
PIC.registerAfterAnalysisCallback(
[this](StringRef P, Any) { this->runAfterPass(P); });
}
} // namespace llvm