lib/Support/Chrono.cpp

   1 //===- Support/Chrono.cpp - Utilities for Timing Manipulation ---*- C++ -*-===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9
  10 #include "llvm/Support/Chrono.h"
  11 #include "llvm/Config/llvm-config.h"
  12 #include "llvm/Support/Format.h"
  13 #include "llvm/Support/raw_ostream.h"
  14
  15 namespace llvm {
  16
  17 using namespace sys;
  18
  19 const char llvm::detail::unit<std::ratio<3600>>::value[] = "h";
  20 const char llvm::detail::unit<std::ratio<60>>::value[] = "m";
  21 const char llvm::detail::unit<std::ratio<1>>::value[] = "s";
  22 const char llvm::detail::unit<std::milli>::value[] = "ms";
  23 const char llvm::detail::unit<std::micro>::value[] = "us";
  24 const char llvm::detail::unit<std::nano>::value[] = "ns";
  25
  26 static inline struct tm getStructTM(TimePoint<> TP) {
  27   struct tm Storage;
  28   std::time_t OurTime = toTimeT(TP);
  29
  30 #if defined(LLVM_ON_UNIX)
  31   struct tm *LT = ::localtime_r(&OurTime, &Storage);
  32   assert(LT);
  33   (void)LT;
  34 #endif
  35 #if defined(_WIN32)
  36   int Error = ::localtime_s(&Storage, &OurTime);
  37   assert(!Error);
  38   (void)Error;
  39 #endif
  40
  41   return Storage;
  42 }
  43
  44 raw_ostream &operator<<(raw_ostream &OS, TimePoint<> TP) {
  45   struct tm LT = getStructTM(TP);
  46   char Buffer[sizeof("YYYY-MM-DD HH:MM:SS")];
  47   strftime(Buffer, sizeof(Buffer), "%Y-%m-%d %H:%M:%S", &LT);
  48   return OS << Buffer << '.'
  49             << format("%.9lu",
  50                       long((TP.time_since_epoch() % std::chrono::seconds(1))
  51                                .count()));
  52 }
  53
  54 void format_provider<TimePoint<>>::format(const TimePoint<> &T, raw_ostream &OS,
  55                                           StringRef Style) {
  56   using namespace std::chrono;
  57   TimePoint<seconds> Truncated = time_point_cast<seconds>(T);
  58   auto Fractional = T - Truncated;
  59   struct tm LT = getStructTM(Truncated);
  60   // Handle extensions first. strftime mangles unknown %x on some platforms.
  61   if (Style.empty()) Style = "%Y-%m-%d %H:%M:%S.%N";
  62   std::string Format;
  63   raw_string_ostream FStream(Format);
  64   for (unsigned I = 0; I < Style.size(); ++I) {
  65     if (Style[I] == '%' && Style.size() > I + 1) switch (Style[I + 1]) {
  66         case 'L':  // Milliseconds, from Ruby.
  67           FStream << llvm::format(
  68               "%.3lu", (long)duration_cast<milliseconds>(Fractional).count());
  69           ++I;
  70           continue;
  71         case 'f':  // Microseconds, from Python.
  72           FStream << llvm::format(
  73               "%.6lu", (long)duration_cast<microseconds>(Fractional).count());
  74           ++I;
  75           continue;
  76         case 'N':  // Nanoseconds, from date(1).
  77           FStream << llvm::format(
  78               "%.6lu", (long)duration_cast<nanoseconds>(Fractional).count());
  79           ++I;
  80           continue;
  81         case '%':  // Consume %%, so %%f parses as (%%)f not %(%f)
  82           FStream << "%%";
  83           ++I;
  84           continue;
  85       }
  86     FStream << Style[I];
  87   }
  88   FStream.flush();
  89   char Buffer[256];  // Should be enough for anywhen.
  90   size_t Len = strftime(Buffer, sizeof(Buffer), Format.c_str(), &LT);
  91   OS << (Len ? Buffer : "BAD-DATE-FORMAT");
  92 }
  93
  94 } // namespace llvm