Timer.cpp revision d3a8d6565ff40fd99533f50a085ace806a9300ee 
1//===-- Timer.cpp -----------------------------------------------*- 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 "Timer.h"
11#include <assert.h>
12
13using namespace lldb_perf;
14
15TimeGauge::TimeType
16TimeGauge::Now ()
17{
18	return high_resolution_clock::now();
19}
20
21TimeGauge::TimeGauge () :
22m_start(),
23    m_state(TimeGauge::State::eNeverUsed)
24{
25}
26
27void
28TimeGauge::Start ()
29{
30	m_state = TimeGauge::State::eCounting;
31	m_start = Now();
32}
33
34double
35TimeGauge::Stop ()
36{
37	auto stop = Now();
38	assert(m_state == TimeGauge::State::eCounting && "cannot stop a non-started clock");
39	m_state = TimeGauge::State::eStopped;
40	return (m_value = duration_cast<duration<double>>(stop-m_start).count());
41}
42
43double
44TimeGauge::GetValue ()
45{
46	assert(m_state == TimeGauge::State::eStopped && "clock must be used before you can evaluate it");
47	return m_value;
48}
49