1 files changed, 61 insertions, 0 deletions
diff --git a/tools/lldb-perf/lib/Timer.cpp b/tools/lldb-perf/lib/Timer.cpp
new file mode 100644
index 000000000000..4bbab904c63e
--- /dev/null
+++ b/tools/lldb-perf/lib/Timer.cpp
@@ -0,0 +1,61 @@
+//===-- Timer.cpp -----------------------------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "Timer.h"
+#include <assert.h>
+
+using namespace lldb_perf;
+
+TimeGauge::TimeType
+TimeGauge::Now ()
+{
+	return high_resolution_clock::now();
+}
+
+TimeGauge::TimeGauge () :
+    m_start(),
+    m_state(TimeGauge::State::eNeverUsed)
+{
+}
+
+void
+TimeGauge::Start ()
+{
+	m_state = TimeGauge::State::eCounting;
+	m_start = Now();
+}
+
+double
+TimeGauge::Stop ()
+{
+	m_stop = Now();
+	assert(m_state == TimeGauge::State::eCounting && "cannot stop a non-started clock");
+	m_state = TimeGauge::State::eStopped;
+    m_delta = duration_cast<duration<double>>(m_stop-m_start).count();
+	return m_delta;
+}
+
+double
+TimeGauge::GetStartValue () const
+{
+    return (double)m_start.time_since_epoch().count() * (double)system_clock::period::num / (double)system_clock::period::den;
+}
+
+double
+TimeGauge::GetStopValue () const
+{
+    return (double)m_stop.time_since_epoch().count() * (double)system_clock::period::num / (double)system_clock::period::den;
+}
+
+double
+TimeGauge::GetDeltaValue () const
+{
+	assert(m_state == TimeGauge::State::eStopped && "clock must be used before you can evaluate it");
+	return m_delta;
+}