1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212
|
//===- unittests/Support/EndianTest.cpp - Endian.h tests ------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#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, ReadBitAligned) {
// Simple test to make sure we properly pull out the 0x0 word.
unsigned char littleval[] = {0x3f, 0x00, 0x00, 0x00, 0xc0, 0xff, 0xff, 0xff};
unsigned char bigval[] = {0x00, 0x00, 0x00, 0x3f, 0xff, 0xff, 0xff, 0xc0};
EXPECT_EQ(
(endian::readAtBitAlignment<int, little, unaligned>(&littleval[0], 6)),
0x0);
EXPECT_EQ((endian::readAtBitAlignment<int, big, unaligned>(&bigval[0], 6)),
0x0);
// Test to make sure that signed right shift of 0xf0000000 is masked
// properly.
unsigned char littleval2[] = {0x00, 0x00, 0x00, 0xf0, 0x00, 0x00, 0x00, 0x00};
unsigned char bigval2[] = {0xf0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
EXPECT_EQ(
(endian::readAtBitAlignment<int, little, unaligned>(&littleval2[0], 4)),
0x0f000000);
EXPECT_EQ((endian::readAtBitAlignment<int, big, unaligned>(&bigval2[0], 4)),
0x0f000000);
// Test to make sure left shift of start bit doesn't overflow.
EXPECT_EQ(
(endian::readAtBitAlignment<int, little, unaligned>(&littleval2[0], 1)),
0x78000000);
EXPECT_EQ((endian::readAtBitAlignment<int, big, unaligned>(&bigval2[0], 1)),
0x78000000);
// Test to make sure 64-bit int doesn't overflow.
unsigned char littleval3[] = {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xf0,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
unsigned char bigval3[] = {0xf0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
EXPECT_EQ((endian::readAtBitAlignment<int64_t, little, unaligned>(
&littleval3[0], 4)),
0x0f00000000000000);
EXPECT_EQ(
(endian::readAtBitAlignment<int64_t, big, unaligned>(&bigval3[0], 4)),
0x0f00000000000000);
}
TEST(Endian, WriteBitAligned) {
// This test ensures that signed right shift of 0xffffaa is masked
// properly.
unsigned char bigval[8] = {0x00};
endian::writeAtBitAlignment<int32_t, big, unaligned>(bigval, (int)0xffffaaaa,
4);
EXPECT_EQ(bigval[0], 0xff);
EXPECT_EQ(bigval[1], 0xfa);
EXPECT_EQ(bigval[2], 0xaa);
EXPECT_EQ(bigval[3], 0xa0);
EXPECT_EQ(bigval[4], 0x00);
EXPECT_EQ(bigval[5], 0x00);
EXPECT_EQ(bigval[6], 0x00);
EXPECT_EQ(bigval[7], 0x0f);
unsigned char littleval[8] = {0x00};
endian::writeAtBitAlignment<int32_t, little, unaligned>(littleval,
(int)0xffffaaaa, 4);
EXPECT_EQ(littleval[0], 0xa0);
EXPECT_EQ(littleval[1], 0xaa);
EXPECT_EQ(littleval[2], 0xfa);
EXPECT_EQ(littleval[3], 0xff);
EXPECT_EQ(littleval[4], 0x0f);
EXPECT_EQ(littleval[5], 0x00);
EXPECT_EQ(littleval[6], 0x00);
EXPECT_EQ(littleval[7], 0x00);
// This test makes sure 1<<31 doesn't overflow.
// Test to make sure left shift of start bit doesn't overflow.
unsigned char bigval2[8] = {0x00};
endian::writeAtBitAlignment<int32_t, big, unaligned>(bigval2, (int)0xffffffff,
1);
EXPECT_EQ(bigval2[0], 0xff);
EXPECT_EQ(bigval2[1], 0xff);
EXPECT_EQ(bigval2[2], 0xff);
EXPECT_EQ(bigval2[3], 0xfe);
EXPECT_EQ(bigval2[4], 0x00);
EXPECT_EQ(bigval2[5], 0x00);
EXPECT_EQ(bigval2[6], 0x00);
EXPECT_EQ(bigval2[7], 0x01);
unsigned char littleval2[8] = {0x00};
endian::writeAtBitAlignment<int32_t, little, unaligned>(littleval2,
(int)0xffffffff, 1);
EXPECT_EQ(littleval2[0], 0xfe);
EXPECT_EQ(littleval2[1], 0xff);
EXPECT_EQ(littleval2[2], 0xff);
EXPECT_EQ(littleval2[3], 0xff);
EXPECT_EQ(littleval2[4], 0x01);
EXPECT_EQ(littleval2[5], 0x00);
EXPECT_EQ(littleval2[6], 0x00);
EXPECT_EQ(littleval2[7], 0x00);
// Test to make sure 64-bit int doesn't overflow.
unsigned char bigval64[16] = {0x00};
endian::writeAtBitAlignment<int64_t, big, unaligned>(
bigval64, (int64_t)0xffffffffffffffff, 1);
EXPECT_EQ(bigval64[0], 0xff);
EXPECT_EQ(bigval64[1], 0xff);
EXPECT_EQ(bigval64[2], 0xff);
EXPECT_EQ(bigval64[3], 0xff);
EXPECT_EQ(bigval64[4], 0xff);
EXPECT_EQ(bigval64[5], 0xff);
EXPECT_EQ(bigval64[6], 0xff);
EXPECT_EQ(bigval64[7], 0xfe);
EXPECT_EQ(bigval64[8], 0x00);
EXPECT_EQ(bigval64[9], 0x00);
EXPECT_EQ(bigval64[10], 0x00);
EXPECT_EQ(bigval64[11], 0x00);
EXPECT_EQ(bigval64[12], 0x00);
EXPECT_EQ(bigval64[13], 0x00);
EXPECT_EQ(bigval64[14], 0x00);
EXPECT_EQ(bigval64[15], 0x01);
unsigned char littleval64[16] = {0x00};
endian::writeAtBitAlignment<int64_t, little, unaligned>(
littleval64, (int64_t)0xffffffffffffffff, 1);
EXPECT_EQ(littleval64[0], 0xfe);
EXPECT_EQ(littleval64[1], 0xff);
EXPECT_EQ(littleval64[2], 0xff);
EXPECT_EQ(littleval64[3], 0xff);
EXPECT_EQ(littleval64[4], 0xff);
EXPECT_EQ(littleval64[5], 0xff);
EXPECT_EQ(littleval64[6], 0xff);
EXPECT_EQ(littleval64[7], 0xff);
EXPECT_EQ(littleval64[8], 0x01);
EXPECT_EQ(littleval64[9], 0x00);
EXPECT_EQ(littleval64[10], 0x00);
EXPECT_EQ(littleval64[11], 0x00);
EXPECT_EQ(littleval64[12], 0x00);
EXPECT_EQ(littleval64[13], 0x00);
EXPECT_EQ(littleval64[14], 0x00);
EXPECT_EQ(littleval64[15], 0x00);
}
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);
}
TEST(Endian, PacketEndianSpecificIntegralAsEnum) {
enum class Test : uint16_t { ONETWO = 0x0102, TWOONE = 0x0201 };
unsigned char bytes[] = {0x01, 0x02};
using LittleTest = little_t<Test>;
using BigTest = big_t<Test>;
EXPECT_EQ(Test::TWOONE, *reinterpret_cast<LittleTest *>(bytes));
EXPECT_EQ(Test::ONETWO, *reinterpret_cast<BigTest *>(bytes));
}
} // end anon namespace
|