1 //===- llvm/Support/Chrono.h - 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 #ifndef LLVM_SUPPORT_CHRONO_H 11 #define LLVM_SUPPORT_CHRONO_H 12 13 #include "llvm/Support/Compiler.h" 14 15 #include <chrono> 16 #include <ctime> 17 18 namespace llvm { 19 20 class raw_ostream; 21 22 namespace sys { 23 24 /// A time point on the system clock. This is provided for two reasons: 25 /// - to insulate us agains subtle differences in behavoir to differences in 26 /// system clock precision (which is implementation-defined and differs between 27 /// platforms). 28 /// - to shorten the type name 29 /// The default precision is nanoseconds. If need a specific precision specify 30 /// it explicitly. If unsure, use the default. If you need a time point on a 31 /// clock other than the system_clock, use std::chrono directly. 32 template <typename D = std::chrono::nanoseconds> 33 using TimePoint = std::chrono::time_point<std::chrono::system_clock, D>; 34 35 /// Convert a TimePoint to std::time_t 36 LLVM_ATTRIBUTE_ALWAYS_INLINE inline std::time_t toTimeT(TimePoint<> TP) { 37 using namespace std::chrono; 38 return system_clock::to_time_t( 39 time_point_cast<system_clock::time_point::duration>(TP)); 40 } 41 42 /// Convert a std::time_t to a TimePoint 43 LLVM_ATTRIBUTE_ALWAYS_INLINE inline TimePoint<std::chrono::seconds> 44 toTimePoint(std::time_t T) { 45 using namespace std::chrono; 46 return time_point_cast<seconds>(system_clock::from_time_t(T)); 47 } 48 49 } // namespace sys 50 51 raw_ostream &operator<<(raw_ostream &OS, sys::TimePoint<> TP); 52 53 } // namespace llvm 54 55 #endif // LLVM_SUPPORT_CHRONO_H 56
