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https://github.com/c64scene-ar/llvm-6502.git
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This patch removes the LLVM global lock, and updates all existing users of the global lock to use their own mutex. None of the existing users of the global lock were protecting code that was mutually exclusive with any of the other users of the global lock, so its purpose was not being met. Reviewed by: rnk Differential Revision: http://reviews.llvm.org/D4142 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@211277 91177308-0d34-0410-b5e6-96231b3b80d8
390 lines
12 KiB
C++
390 lines
12 KiB
C++
//===-- Timer.cpp - Interval Timing Support -------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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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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//===----------------------------------------------------------------------===//
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//
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// Interval Timing implementation.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Support/Timer.h"
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#include "llvm/ADT/StringMap.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/FileSystem.h"
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#include "llvm/Support/Format.h"
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#include "llvm/Support/ManagedStatic.h"
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#include "llvm/Support/Mutex.h"
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#include "llvm/Support/MutexGuard.h"
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#include "llvm/Support/Process.h"
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#include "llvm/Support/raw_ostream.h"
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using namespace llvm;
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// CreateInfoOutputFile - Return a file stream to print our output on.
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namespace llvm { extern raw_ostream *CreateInfoOutputFile(); }
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// getLibSupportInfoOutputFilename - This ugly hack is brought to you courtesy
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// of constructor/destructor ordering being unspecified by C++. Basically the
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// problem is that a Statistic object gets destroyed, which ends up calling
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// 'GetLibSupportInfoOutputFile()' (below), which calls this function.
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// LibSupportInfoOutputFilename used to be a global variable, but sometimes it
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// would get destroyed before the Statistic, causing havoc to ensue. We "fix"
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// this by creating the string the first time it is needed and never destroying
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// it.
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static ManagedStatic<std::string> LibSupportInfoOutputFilename;
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static std::string &getLibSupportInfoOutputFilename() {
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return *LibSupportInfoOutputFilename;
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}
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static ManagedStatic<sys::SmartMutex<true> > TimerLock;
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namespace {
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static cl::opt<bool>
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TrackSpace("track-memory", cl::desc("Enable -time-passes memory "
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"tracking (this may be slow)"),
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cl::Hidden);
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static cl::opt<std::string, true>
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InfoOutputFilename("info-output-file", cl::value_desc("filename"),
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cl::desc("File to append -stats and -timer output to"),
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cl::Hidden, cl::location(getLibSupportInfoOutputFilename()));
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}
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// CreateInfoOutputFile - Return a file stream to print our output on.
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raw_ostream *llvm::CreateInfoOutputFile() {
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const std::string &OutputFilename = getLibSupportInfoOutputFilename();
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if (OutputFilename.empty())
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return new raw_fd_ostream(2, false); // stderr.
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if (OutputFilename == "-")
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return new raw_fd_ostream(1, false); // stdout.
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// Append mode is used because the info output file is opened and closed
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// each time -stats or -time-passes wants to print output to it. To
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// compensate for this, the test-suite Makefiles have code to delete the
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// info output file before running commands which write to it.
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std::string Error;
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raw_ostream *Result = new raw_fd_ostream(
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OutputFilename.c_str(), Error, sys::fs::F_Append | sys::fs::F_Text);
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if (Error.empty())
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return Result;
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errs() << "Error opening info-output-file '"
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<< OutputFilename << " for appending!\n";
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delete Result;
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return new raw_fd_ostream(2, false); // stderr.
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}
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static TimerGroup *DefaultTimerGroup = nullptr;
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static TimerGroup *getDefaultTimerGroup() {
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TimerGroup *tmp = DefaultTimerGroup;
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sys::MemoryFence();
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if (tmp) return tmp;
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sys::SmartScopedLock<true> Lock(*TimerLock);
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tmp = DefaultTimerGroup;
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if (!tmp) {
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tmp = new TimerGroup("Miscellaneous Ungrouped Timers");
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sys::MemoryFence();
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DefaultTimerGroup = tmp;
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}
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return tmp;
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}
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//===----------------------------------------------------------------------===//
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// Timer Implementation
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//===----------------------------------------------------------------------===//
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void Timer::init(StringRef N) {
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assert(!TG && "Timer already initialized");
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Name.assign(N.begin(), N.end());
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Started = false;
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TG = getDefaultTimerGroup();
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TG->addTimer(*this);
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}
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void Timer::init(StringRef N, TimerGroup &tg) {
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assert(!TG && "Timer already initialized");
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Name.assign(N.begin(), N.end());
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Started = false;
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TG = &tg;
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TG->addTimer(*this);
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}
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Timer::~Timer() {
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if (!TG) return; // Never initialized, or already cleared.
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TG->removeTimer(*this);
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}
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static inline size_t getMemUsage() {
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if (!TrackSpace) return 0;
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return sys::Process::GetMallocUsage();
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}
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TimeRecord TimeRecord::getCurrentTime(bool Start) {
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TimeRecord Result;
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sys::TimeValue now(0,0), user(0,0), sys(0,0);
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if (Start) {
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Result.MemUsed = getMemUsage();
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sys::Process::GetTimeUsage(now, user, sys);
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} else {
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sys::Process::GetTimeUsage(now, user, sys);
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Result.MemUsed = getMemUsage();
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}
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Result.WallTime = now.seconds() + now.microseconds() / 1000000.0;
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Result.UserTime = user.seconds() + user.microseconds() / 1000000.0;
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Result.SystemTime = sys.seconds() + sys.microseconds() / 1000000.0;
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return Result;
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}
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static ManagedStatic<std::vector<Timer*> > ActiveTimers;
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void Timer::startTimer() {
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Started = true;
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ActiveTimers->push_back(this);
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Time -= TimeRecord::getCurrentTime(true);
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}
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void Timer::stopTimer() {
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Time += TimeRecord::getCurrentTime(false);
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if (ActiveTimers->back() == this) {
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ActiveTimers->pop_back();
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} else {
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std::vector<Timer*>::iterator I =
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std::find(ActiveTimers->begin(), ActiveTimers->end(), this);
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assert(I != ActiveTimers->end() && "stop but no startTimer?");
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ActiveTimers->erase(I);
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}
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}
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static void printVal(double Val, double Total, raw_ostream &OS) {
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if (Total < 1e-7) // Avoid dividing by zero.
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OS << " ----- ";
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else
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OS << format(" %7.4f (%5.1f%%)", Val, Val*100/Total);
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}
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void TimeRecord::print(const TimeRecord &Total, raw_ostream &OS) const {
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if (Total.getUserTime())
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printVal(getUserTime(), Total.getUserTime(), OS);
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if (Total.getSystemTime())
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printVal(getSystemTime(), Total.getSystemTime(), OS);
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if (Total.getProcessTime())
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printVal(getProcessTime(), Total.getProcessTime(), OS);
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printVal(getWallTime(), Total.getWallTime(), OS);
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OS << " ";
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if (Total.getMemUsed())
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OS << format("%9" PRId64 " ", (int64_t)getMemUsed());
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}
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//===----------------------------------------------------------------------===//
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// NamedRegionTimer Implementation
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//===----------------------------------------------------------------------===//
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namespace {
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typedef StringMap<Timer> Name2TimerMap;
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class Name2PairMap {
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StringMap<std::pair<TimerGroup*, Name2TimerMap> > Map;
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public:
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~Name2PairMap() {
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for (StringMap<std::pair<TimerGroup*, Name2TimerMap> >::iterator
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I = Map.begin(), E = Map.end(); I != E; ++I)
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delete I->second.first;
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}
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Timer &get(StringRef Name, StringRef GroupName) {
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sys::SmartScopedLock<true> L(*TimerLock);
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std::pair<TimerGroup*, Name2TimerMap> &GroupEntry = Map[GroupName];
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if (!GroupEntry.first)
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GroupEntry.first = new TimerGroup(GroupName);
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Timer &T = GroupEntry.second[Name];
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if (!T.isInitialized())
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T.init(Name, *GroupEntry.first);
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return T;
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}
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};
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}
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static ManagedStatic<Name2TimerMap> NamedTimers;
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static ManagedStatic<Name2PairMap> NamedGroupedTimers;
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static Timer &getNamedRegionTimer(StringRef Name) {
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sys::SmartScopedLock<true> L(*TimerLock);
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Timer &T = (*NamedTimers)[Name];
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if (!T.isInitialized())
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T.init(Name);
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return T;
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}
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NamedRegionTimer::NamedRegionTimer(StringRef Name,
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bool Enabled)
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: TimeRegion(!Enabled ? nullptr : &getNamedRegionTimer(Name)) {}
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NamedRegionTimer::NamedRegionTimer(StringRef Name, StringRef GroupName,
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bool Enabled)
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: TimeRegion(!Enabled ? nullptr : &NamedGroupedTimers->get(Name, GroupName)){}
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//===----------------------------------------------------------------------===//
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// TimerGroup Implementation
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//===----------------------------------------------------------------------===//
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/// TimerGroupList - This is the global list of TimerGroups, maintained by the
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/// TimerGroup ctor/dtor and is protected by the TimerLock lock.
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static TimerGroup *TimerGroupList = nullptr;
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TimerGroup::TimerGroup(StringRef name)
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: Name(name.begin(), name.end()), FirstTimer(nullptr) {
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// Add the group to TimerGroupList.
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sys::SmartScopedLock<true> L(*TimerLock);
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if (TimerGroupList)
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TimerGroupList->Prev = &Next;
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Next = TimerGroupList;
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Prev = &TimerGroupList;
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TimerGroupList = this;
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}
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TimerGroup::~TimerGroup() {
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// If the timer group is destroyed before the timers it owns, accumulate and
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// print the timing data.
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while (FirstTimer)
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removeTimer(*FirstTimer);
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// Remove the group from the TimerGroupList.
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sys::SmartScopedLock<true> L(*TimerLock);
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*Prev = Next;
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if (Next)
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Next->Prev = Prev;
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}
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void TimerGroup::removeTimer(Timer &T) {
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sys::SmartScopedLock<true> L(*TimerLock);
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// If the timer was started, move its data to TimersToPrint.
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if (T.Started)
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TimersToPrint.push_back(std::make_pair(T.Time, T.Name));
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T.TG = nullptr;
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// Unlink the timer from our list.
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*T.Prev = T.Next;
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if (T.Next)
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T.Next->Prev = T.Prev;
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// Print the report when all timers in this group are destroyed if some of
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// them were started.
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if (FirstTimer || TimersToPrint.empty())
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return;
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raw_ostream *OutStream = CreateInfoOutputFile();
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PrintQueuedTimers(*OutStream);
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delete OutStream; // Close the file.
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}
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void TimerGroup::addTimer(Timer &T) {
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sys::SmartScopedLock<true> L(*TimerLock);
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// Add the timer to our list.
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if (FirstTimer)
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FirstTimer->Prev = &T.Next;
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T.Next = FirstTimer;
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T.Prev = &FirstTimer;
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FirstTimer = &T;
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}
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void TimerGroup::PrintQueuedTimers(raw_ostream &OS) {
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// Sort the timers in descending order by amount of time taken.
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std::sort(TimersToPrint.begin(), TimersToPrint.end());
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TimeRecord Total;
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for (unsigned i = 0, e = TimersToPrint.size(); i != e; ++i)
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Total += TimersToPrint[i].first;
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// Print out timing header.
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OS << "===" << std::string(73, '-') << "===\n";
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// Figure out how many spaces to indent TimerGroup name.
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unsigned Padding = (80-Name.length())/2;
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if (Padding > 80) Padding = 0; // Don't allow "negative" numbers
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OS.indent(Padding) << Name << '\n';
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OS << "===" << std::string(73, '-') << "===\n";
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// If this is not an collection of ungrouped times, print the total time.
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// Ungrouped timers don't really make sense to add up. We still print the
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// TOTAL line to make the percentages make sense.
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if (this != DefaultTimerGroup)
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OS << format(" Total Execution Time: %5.4f seconds (%5.4f wall clock)\n",
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Total.getProcessTime(), Total.getWallTime());
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OS << '\n';
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if (Total.getUserTime())
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OS << " ---User Time---";
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if (Total.getSystemTime())
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OS << " --System Time--";
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if (Total.getProcessTime())
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OS << " --User+System--";
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OS << " ---Wall Time---";
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if (Total.getMemUsed())
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OS << " ---Mem---";
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OS << " --- Name ---\n";
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// Loop through all of the timing data, printing it out.
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for (unsigned i = 0, e = TimersToPrint.size(); i != e; ++i) {
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const std::pair<TimeRecord, std::string> &Entry = TimersToPrint[e-i-1];
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Entry.first.print(Total, OS);
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OS << Entry.second << '\n';
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}
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Total.print(Total, OS);
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OS << "Total\n\n";
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OS.flush();
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TimersToPrint.clear();
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}
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/// print - Print any started timers in this group and zero them.
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void TimerGroup::print(raw_ostream &OS) {
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sys::SmartScopedLock<true> L(*TimerLock);
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// See if any of our timers were started, if so add them to TimersToPrint and
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// reset them.
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for (Timer *T = FirstTimer; T; T = T->Next) {
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if (!T->Started) continue;
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TimersToPrint.push_back(std::make_pair(T->Time, T->Name));
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// Clear out the time.
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T->Started = 0;
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T->Time = TimeRecord();
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}
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// If any timers were started, print the group.
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if (!TimersToPrint.empty())
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PrintQueuedTimers(OS);
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}
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/// printAll - This static method prints all timers and clears them all out.
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void TimerGroup::printAll(raw_ostream &OS) {
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sys::SmartScopedLock<true> L(*TimerLock);
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for (TimerGroup *TG = TimerGroupList; TG; TG = TG->Next)
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TG->print(OS);
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}
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