1 //===- unittests/Support/EndianTest.cpp - Endian.h tests ------------------===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 9 #include "llvm/Support/Endian.h" 10 #include "llvm/Support/DataTypes.h" 11 #include "gtest/gtest.h" 12 #include <cstdlib> 13 #include <ctime> 14 using namespace llvm; 15 using namespace support; 16 17 #undef max 18 19 namespace { 20 21 TEST(Endian, Read) { 22 // These are 5 bytes so we can be sure at least one of the reads is unaligned. 23 unsigned char bigval[] = {0x00, 0x01, 0x02, 0x03, 0x04}; 24 unsigned char littleval[] = {0x00, 0x04, 0x03, 0x02, 0x01}; 25 int32_t BigAsHost = 0x00010203; 26 EXPECT_EQ(BigAsHost, (endian::read<int32_t, big, unaligned>(bigval))); 27 int32_t LittleAsHost = 0x02030400; 28 EXPECT_EQ(LittleAsHost,(endian::read<int32_t, little, unaligned>(littleval))); 29 30 EXPECT_EQ((endian::read<int32_t, big, unaligned>(bigval + 1)), 31 (endian::read<int32_t, little, unaligned>(littleval + 1))); 32 } 33 34 TEST(Endian, ReadBitAligned) { 35 // Simple test to make sure we properly pull out the 0x0 word. 36 unsigned char littleval[] = {0x3f, 0x00, 0x00, 0x00, 0xc0, 0xff, 0xff, 0xff}; 37 unsigned char bigval[] = {0x00, 0x00, 0x00, 0x3f, 0xff, 0xff, 0xff, 0xc0}; 38 EXPECT_EQ( 39 (endian::readAtBitAlignment<int, little, unaligned>(&littleval[0], 6)), 40 0x0); 41 EXPECT_EQ((endian::readAtBitAlignment<int, big, unaligned>(&bigval[0], 6)), 42 0x0); 43 // Test to make sure that signed right shift of 0xf0000000 is masked 44 // properly. 45 unsigned char littleval2[] = {0x00, 0x00, 0x00, 0xf0, 0x00, 0x00, 0x00, 0x00}; 46 unsigned char bigval2[] = {0xf0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}; 47 EXPECT_EQ( 48 (endian::readAtBitAlignment<int, little, unaligned>(&littleval2[0], 4)), 49 0x0f000000); 50 EXPECT_EQ((endian::readAtBitAlignment<int, big, unaligned>(&bigval2[0], 4)), 51 0x0f000000); 52 // Test to make sure left shift of start bit doesn't overflow. 53 EXPECT_EQ( 54 (endian::readAtBitAlignment<int, little, unaligned>(&littleval2[0], 1)), 55 0x78000000); 56 EXPECT_EQ((endian::readAtBitAlignment<int, big, unaligned>(&bigval2[0], 1)), 57 0x78000000); 58 // Test to make sure 64-bit int doesn't overflow. 59 unsigned char littleval3[] = {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xf0, 60 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}; 61 unsigned char bigval3[] = {0xf0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 62 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}; 63 EXPECT_EQ((endian::readAtBitAlignment<int64_t, little, unaligned>( 64 &littleval3[0], 4)), 65 0x0f00000000000000); 66 EXPECT_EQ( 67 (endian::readAtBitAlignment<int64_t, big, unaligned>(&bigval3[0], 4)), 68 0x0f00000000000000); 69 } 70 71 TEST(Endian, WriteBitAligned) { 72 // This test ensures that signed right shift of 0xffffaa is masked 73 // properly. 74 unsigned char bigval[8] = {0x00}; 75 endian::writeAtBitAlignment<int32_t, big, unaligned>(bigval, (int)0xffffaaaa, 76 4); 77 EXPECT_EQ(bigval[0], 0xff); 78 EXPECT_EQ(bigval[1], 0xfa); 79 EXPECT_EQ(bigval[2], 0xaa); 80 EXPECT_EQ(bigval[3], 0xa0); 81 EXPECT_EQ(bigval[4], 0x00); 82 EXPECT_EQ(bigval[5], 0x00); 83 EXPECT_EQ(bigval[6], 0x00); 84 EXPECT_EQ(bigval[7], 0x0f); 85 86 unsigned char littleval[8] = {0x00}; 87 endian::writeAtBitAlignment<int32_t, little, unaligned>(littleval, 88 (int)0xffffaaaa, 4); 89 EXPECT_EQ(littleval[0], 0xa0); 90 EXPECT_EQ(littleval[1], 0xaa); 91 EXPECT_EQ(littleval[2], 0xfa); 92 EXPECT_EQ(littleval[3], 0xff); 93 EXPECT_EQ(littleval[4], 0x0f); 94 EXPECT_EQ(littleval[5], 0x00); 95 EXPECT_EQ(littleval[6], 0x00); 96 EXPECT_EQ(littleval[7], 0x00); 97 98 // This test makes sure 1<<31 doesn't overflow. 99 // Test to make sure left shift of start bit doesn't overflow. 100 unsigned char bigval2[8] = {0x00}; 101 endian::writeAtBitAlignment<int32_t, big, unaligned>(bigval2, (int)0xffffffff, 102 1); 103 EXPECT_EQ(bigval2[0], 0xff); 104 EXPECT_EQ(bigval2[1], 0xff); 105 EXPECT_EQ(bigval2[2], 0xff); 106 EXPECT_EQ(bigval2[3], 0xfe); 107 EXPECT_EQ(bigval2[4], 0x00); 108 EXPECT_EQ(bigval2[5], 0x00); 109 EXPECT_EQ(bigval2[6], 0x00); 110 EXPECT_EQ(bigval2[7], 0x01); 111 112 unsigned char littleval2[8] = {0x00}; 113 endian::writeAtBitAlignment<int32_t, little, unaligned>(littleval2, 114 (int)0xffffffff, 1); 115 EXPECT_EQ(littleval2[0], 0xfe); 116 EXPECT_EQ(littleval2[1], 0xff); 117 EXPECT_EQ(littleval2[2], 0xff); 118 EXPECT_EQ(littleval2[3], 0xff); 119 EXPECT_EQ(littleval2[4], 0x01); 120 EXPECT_EQ(littleval2[5], 0x00); 121 EXPECT_EQ(littleval2[6], 0x00); 122 EXPECT_EQ(littleval2[7], 0x00); 123 124 // Test to make sure 64-bit int doesn't overflow. 125 unsigned char bigval64[16] = {0x00}; 126 endian::writeAtBitAlignment<int64_t, big, unaligned>( 127 bigval64, (int64_t)0xffffffffffffffff, 1); 128 EXPECT_EQ(bigval64[0], 0xff); 129 EXPECT_EQ(bigval64[1], 0xff); 130 EXPECT_EQ(bigval64[2], 0xff); 131 EXPECT_EQ(bigval64[3], 0xff); 132 EXPECT_EQ(bigval64[4], 0xff); 133 EXPECT_EQ(bigval64[5], 0xff); 134 EXPECT_EQ(bigval64[6], 0xff); 135 EXPECT_EQ(bigval64[7], 0xfe); 136 EXPECT_EQ(bigval64[8], 0x00); 137 EXPECT_EQ(bigval64[9], 0x00); 138 EXPECT_EQ(bigval64[10], 0x00); 139 EXPECT_EQ(bigval64[11], 0x00); 140 EXPECT_EQ(bigval64[12], 0x00); 141 EXPECT_EQ(bigval64[13], 0x00); 142 EXPECT_EQ(bigval64[14], 0x00); 143 EXPECT_EQ(bigval64[15], 0x01); 144 145 unsigned char littleval64[16] = {0x00}; 146 endian::writeAtBitAlignment<int64_t, little, unaligned>( 147 littleval64, (int64_t)0xffffffffffffffff, 1); 148 EXPECT_EQ(littleval64[0], 0xfe); 149 EXPECT_EQ(littleval64[1], 0xff); 150 EXPECT_EQ(littleval64[2], 0xff); 151 EXPECT_EQ(littleval64[3], 0xff); 152 EXPECT_EQ(littleval64[4], 0xff); 153 EXPECT_EQ(littleval64[5], 0xff); 154 EXPECT_EQ(littleval64[6], 0xff); 155 EXPECT_EQ(littleval64[7], 0xff); 156 EXPECT_EQ(littleval64[8], 0x01); 157 EXPECT_EQ(littleval64[9], 0x00); 158 EXPECT_EQ(littleval64[10], 0x00); 159 EXPECT_EQ(littleval64[11], 0x00); 160 EXPECT_EQ(littleval64[12], 0x00); 161 EXPECT_EQ(littleval64[13], 0x00); 162 EXPECT_EQ(littleval64[14], 0x00); 163 EXPECT_EQ(littleval64[15], 0x00); 164 } 165 166 TEST(Endian, Write) { 167 unsigned char data[5]; 168 endian::write<int32_t, big, unaligned>(data, -1362446643); 169 EXPECT_EQ(data[0], 0xAE); 170 EXPECT_EQ(data[1], 0xCA); 171 EXPECT_EQ(data[2], 0xB6); 172 EXPECT_EQ(data[3], 0xCD); 173 endian::write<int32_t, big, unaligned>(data + 1, -1362446643); 174 EXPECT_EQ(data[1], 0xAE); 175 EXPECT_EQ(data[2], 0xCA); 176 EXPECT_EQ(data[3], 0xB6); 177 EXPECT_EQ(data[4], 0xCD); 178 179 endian::write<int32_t, little, unaligned>(data, -1362446643); 180 EXPECT_EQ(data[0], 0xCD); 181 EXPECT_EQ(data[1], 0xB6); 182 EXPECT_EQ(data[2], 0xCA); 183 EXPECT_EQ(data[3], 0xAE); 184 endian::write<int32_t, little, unaligned>(data + 1, -1362446643); 185 EXPECT_EQ(data[1], 0xCD); 186 EXPECT_EQ(data[2], 0xB6); 187 EXPECT_EQ(data[3], 0xCA); 188 EXPECT_EQ(data[4], 0xAE); 189 } 190 191 TEST(Endian, PackedEndianSpecificIntegral) { 192 // These are 5 bytes so we can be sure at least one of the reads is unaligned. 193 unsigned char big[] = {0x00, 0x01, 0x02, 0x03, 0x04}; 194 unsigned char little[] = {0x00, 0x04, 0x03, 0x02, 0x01}; 195 big32_t *big_val = 196 reinterpret_cast<big32_t *>(big + 1); 197 little32_t *little_val = 198 reinterpret_cast<little32_t *>(little + 1); 199 200 EXPECT_EQ(*big_val, *little_val); 201 } 202 203 } // end anon namespace 204