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      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 using namespace sys;
     19 
     20 const TimeValue::SecondsType
     21   TimeValue::PosixZeroTimeSeconds = -946684800;
     22 const TimeValue::SecondsType
     23   TimeValue::Win32ZeroTimeSeconds = -12591158400ULL;
     24 
     25 const TimeValue TimeValue::MinTime       = TimeValue ( INT64_MIN,0 );
     26 const TimeValue TimeValue::MaxTime       = TimeValue ( INT64_MAX,0 );
     27 const TimeValue TimeValue::ZeroTime      = TimeValue ( 0,0 );
     28 const TimeValue TimeValue::PosixZeroTime = TimeValue ( PosixZeroTimeSeconds,0 );
     29 const TimeValue TimeValue::Win32ZeroTime = TimeValue ( Win32ZeroTimeSeconds,0 );
     30 
     31 void
     32 TimeValue::normalize( void ) {
     33   if ( nanos_ >= NANOSECONDS_PER_SECOND ) {
     34     do {
     35       seconds_++;
     36       nanos_ -= NANOSECONDS_PER_SECOND;
     37     } while ( nanos_ >= NANOSECONDS_PER_SECOND );
     38   } else if (nanos_ <= -NANOSECONDS_PER_SECOND ) {
     39     do {
     40       seconds_--;
     41       nanos_ += NANOSECONDS_PER_SECOND;
     42     } while (nanos_ <= -NANOSECONDS_PER_SECOND);
     43   }
     44 
     45   if (seconds_ >= 1 && nanos_ < 0) {
     46     seconds_--;
     47     nanos_ += NANOSECONDS_PER_SECOND;
     48   } else if (seconds_ < 0 && nanos_ > 0) {
     49     seconds_++;
     50     nanos_ -= NANOSECONDS_PER_SECOND;
     51   }
     52 }
     53 
     54 }
     55 
     56 /// Include the platform specific portion of TimeValue class
     57 #ifdef LLVM_ON_UNIX
     58 #include "Unix/TimeValue.inc"
     59 #endif
     60 #ifdef LLVM_ON_WIN32
     61 #include "Windows/TimeValue.inc"
     62 #endif
     63