llvm/unittests/Support/Chrono.cpp
Pavel Labath 911bb941ce Reapply "Add Chrono.h - std::chrono support header"
This is a resubmission of r284590. The mingw build should be fixed now. The
problem was we were matching time_t with _localtime_64s, which was incorrect on
_USE_32BIT_TIME_T systems. Instead I use localtime_s, which should always
evaluate to the correct function.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@284720 91177308-0d34-0410-b5e6-96231b3b80d8
2016-10-20 12:05:50 +00:00

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//===- llvm/unittest/Support/Chrono.cpp - Time utilities tests ------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "llvm/Support/Chrono.h"
#include "llvm/ADT/SmallVector.h"
#include "gtest/gtest.h"
using namespace llvm;
using namespace llvm::sys;
using namespace std::chrono;
namespace {
TEST(Chrono, TimeTConversion) {
EXPECT_EQ(time_t(0), toTimeT(toTimePoint(time_t(0))));
EXPECT_EQ(time_t(1), toTimeT(toTimePoint(time_t(1))));
EXPECT_EQ(time_t(47), toTimeT(toTimePoint(time_t(47))));
TimePoint<> TP;
EXPECT_EQ(TP, toTimePoint(toTimeT(TP)));
TP += seconds(1);
EXPECT_EQ(TP, toTimePoint(toTimeT(TP)));
TP += hours(47);
EXPECT_EQ(TP, toTimePoint(toTimeT(TP)));
}
TEST(Chrono, StringConversion) {
std::string S;
raw_string_ostream OS(S);
OS << system_clock::now();
// Do a basic sanity check on the output.
// The format we expect is YYYY-MM-DD HH:MM:SS.MMMUUUNNN
StringRef Date, Time;
std::tie(Date, Time) = StringRef(OS.str()).split(' ');
SmallVector<StringRef, 3> Components;
Date.split(Components, '-');
ASSERT_EQ(3u, Components.size());
EXPECT_EQ(4u, Components[0].size());
EXPECT_EQ(2u, Components[1].size());
EXPECT_EQ(2u, Components[2].size());
StringRef Sec, Nano;
std::tie(Sec, Nano) = Time.split('.');
Components.clear();
Sec.split(Components, ':');
ASSERT_EQ(3u, Components.size());
EXPECT_EQ(2u, Components[0].size());
EXPECT_EQ(2u, Components[1].size());
EXPECT_EQ(2u, Components[2].size());
EXPECT_EQ(9u, Nano.size());
}
// Test that toTimePoint and toTimeT can be called with a arguments with varying
// precisions.
TEST(Chrono, ImplicitConversions) {
std::time_t TimeT = 47;
TimePoint<seconds> Sec = toTimePoint(TimeT);
TimePoint<milliseconds> Milli = toTimePoint(TimeT);
TimePoint<microseconds> Micro = toTimePoint(TimeT);
TimePoint<nanoseconds> Nano = toTimePoint(TimeT);
EXPECT_EQ(Sec, Milli);
EXPECT_EQ(Sec, Micro);
EXPECT_EQ(Sec, Nano);
EXPECT_EQ(TimeT, toTimeT(Sec));
EXPECT_EQ(TimeT, toTimeT(Milli));
EXPECT_EQ(TimeT, toTimeT(Micro));
EXPECT_EQ(TimeT, toTimeT(Nano));
}
} // anonymous namespace