blob: 8f93553063833597271d6c917b336572667bfeb7 [file] [log] [blame]
//===- unittests/Support/EndianTest.cpp - Endian.h 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/Endian.h"
#include "llvm/Support/DataTypes.h"
#include "gtest/gtest.h"
#include <cstdlib>
#include <ctime>
using namespace llvm;
using namespace support;
#undef max
namespace {
TEST(Endian, Read) {
// These are 5 bytes so we can be sure at least one of the reads is unaligned.
unsigned char bigval[] = {0x00, 0x01, 0x02, 0x03, 0x04};
unsigned char littleval[] = {0x00, 0x04, 0x03, 0x02, 0x01};
int32_t BigAsHost = 0x00010203;
EXPECT_EQ(BigAsHost, (endian::read<int32_t, big, unaligned>(bigval)));
int32_t LittleAsHost = 0x02030400;
EXPECT_EQ(LittleAsHost,(endian::read<int32_t, little, unaligned>(littleval)));
EXPECT_EQ((endian::read<int32_t, big, unaligned>(bigval + 1)),
(endian::read<int32_t, little, unaligned>(littleval + 1)));
TEST(Endian, Write) {
unsigned char data[5];
endian::write<int32_t, big, unaligned>(data, -1362446643);
EXPECT_EQ(data[0], 0xAE);
EXPECT_EQ(data[1], 0xCA);
EXPECT_EQ(data[2], 0xB6);
EXPECT_EQ(data[3], 0xCD);
endian::write<int32_t, big, unaligned>(data + 1, -1362446643);
EXPECT_EQ(data[1], 0xAE);
EXPECT_EQ(data[2], 0xCA);
EXPECT_EQ(data[3], 0xB6);
EXPECT_EQ(data[4], 0xCD);
endian::write<int32_t, little, unaligned>(data, -1362446643);
EXPECT_EQ(data[0], 0xCD);
EXPECT_EQ(data[1], 0xB6);
EXPECT_EQ(data[2], 0xCA);
EXPECT_EQ(data[3], 0xAE);
endian::write<int32_t, little, unaligned>(data + 1, -1362446643);
EXPECT_EQ(data[1], 0xCD);
EXPECT_EQ(data[2], 0xB6);
EXPECT_EQ(data[3], 0xCA);
EXPECT_EQ(data[4], 0xAE);
TEST(Endian, PackedEndianSpecificIntegral) {
// These are 5 bytes so we can be sure at least one of the reads is unaligned.
unsigned char big[] = {0x00, 0x01, 0x02, 0x03, 0x04};
unsigned char little[] = {0x00, 0x04, 0x03, 0x02, 0x01};
big32_t *big_val =
reinterpret_cast<big32_t *>(big + 1);
little32_t *little_val =
reinterpret_cast<little32_t *>(little + 1);
EXPECT_EQ(*big_val, *little_val);
} // end anon namespace