1 //===-- TimeValue.cpp - Implement OS TimeValue Concept ----------*- 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 //  This file implements the operating system TimeValue concept.
11 //
12 //===----------------------------------------------------------------------===//
13 
14 #include "llvm/Support/TimeValue.h"
15 #include "llvm/Config/config.h"
16 
17 namespace llvm {
18 
19 using namespace sys;
20 
21 const TimeValue::SecondsType
22   TimeValue::PosixZeroTimeSeconds = -946684800;
23 const TimeValue::SecondsType
24   TimeValue::Win32ZeroTimeSeconds = -12591158400ULL;
25 
normalize()26 void TimeValue::normalize() {
27   if ( nanos_ >= NANOSECONDS_PER_SECOND ) {
28     do {
29       seconds_++;
30       nanos_ -= NANOSECONDS_PER_SECOND;
31     } while ( nanos_ >= NANOSECONDS_PER_SECOND );
32   } else if (nanos_ <= -NANOSECONDS_PER_SECOND ) {
33     do {
34       seconds_--;
35       nanos_ += NANOSECONDS_PER_SECOND;
36     } while (nanos_ <= -NANOSECONDS_PER_SECOND);
37   }
38 
39   if (seconds_ >= 1 && nanos_ < 0) {
40     seconds_--;
41     nanos_ += NANOSECONDS_PER_SECOND;
42   } else if (seconds_ < 0 && nanos_ > 0) {
43     seconds_++;
44     nanos_ -= NANOSECONDS_PER_SECOND;
45   }
46 }
47 
48 } // namespace llvm
49 
50 /// Include the platform-specific portion of TimeValue class
51 #ifdef LLVM_ON_UNIX
52 #include "Unix/TimeValue.inc"
53 #endif
54 #ifdef LLVM_ON_WIN32
55 #include "Windows/TimeValue.inc"
56 #endif
57