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 
getStructTM(TimePoint<> TP)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 
operator <<(raw_ostream & OS,TimePoint<> TP)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 
format(const TimePoint<> & T,raw_ostream & OS,StringRef Style)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
95