1 //===- unittests/Support/EndianTest.cpp - Endian.h tests ------------------===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 10 #include "llvm/Support/Endian.h" 11 #include "llvm/Support/DataTypes.h" 12 #include "gtest/gtest.h" 13 #include <cstdlib> 14 #include <ctime> 15 using namespace llvm; 16 using namespace support; 17 18 #undef max 19 20 namespace { 21 22 TEST(Endian, Read) { 23 // These are 5 bytes so we can be sure at least one of the reads is unaligned. 24 unsigned char bigval[] = {0x00, 0x01, 0x02, 0x03, 0x04}; 25 unsigned char littleval[] = {0x00, 0x04, 0x03, 0x02, 0x01}; 26 int32_t BigAsHost = 0x00010203; 27 EXPECT_EQ(BigAsHost, (endian::read<int32_t, big, unaligned>(bigval))); 28 int32_t LittleAsHost = 0x02030400; 29 EXPECT_EQ(LittleAsHost,(endian::read<int32_t, little, unaligned>(littleval))); 30 31 EXPECT_EQ((endian::read<int32_t, big, unaligned>(bigval + 1)), 32 (endian::read<int32_t, little, unaligned>(littleval + 1))); 33 } 34 35 TEST(Endian, ReadBitAligned) { 36 // Simple test to make sure we properly pull out the 0x0 word. 37 unsigned char littleval[] = {0x3f, 0x00, 0x00, 0x00, 0xc0, 0xff, 0xff, 0xff}; 38 unsigned char bigval[] = {0x00, 0x00, 0x00, 0x3f, 0xff, 0xff, 0xff, 0xc0}; 39 EXPECT_EQ( 40 (endian::readAtBitAlignment<int, little, unaligned>(&littleval[0], 6)), 41 0x0); 42 EXPECT_EQ((endian::readAtBitAlignment<int, big, unaligned>(&bigval[0], 6)), 43 0x0); 44 // Test to make sure that signed right shift of 0xf0000000 is masked 45 // properly. 46 unsigned char littleval2[] = {0x00, 0x00, 0x00, 0xf0, 0x00, 0x00, 0x00, 0x00}; 47 unsigned char bigval2[] = {0xf0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}; 48 EXPECT_EQ( 49 (endian::readAtBitAlignment<int, little, unaligned>(&littleval2[0], 4)), 50 0x0f000000); 51 EXPECT_EQ((endian::readAtBitAlignment<int, big, unaligned>(&bigval2[0], 4)), 52 0x0f000000); 53 // Test to make sure left shift of start bit doesn't overflow. 54 EXPECT_EQ( 55 (endian::readAtBitAlignment<int, little, unaligned>(&littleval2[0], 1)), 56 0x78000000); 57 EXPECT_EQ((endian::readAtBitAlignment<int, big, unaligned>(&bigval2[0], 1)), 58 0x78000000); 59 // Test to make sure 64-bit int doesn't overflow. 60 unsigned char littleval3[] = {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xf0, 61 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}; 62 unsigned char bigval3[] = {0xf0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 63 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}; 64 EXPECT_EQ((endian::readAtBitAlignment<int64_t, little, unaligned>( 65 &littleval3[0], 4)), 66 0x0f00000000000000); 67 EXPECT_EQ( 68 (endian::readAtBitAlignment<int64_t, big, unaligned>(&bigval3[0], 4)), 69 0x0f00000000000000); 70 } 71 72 TEST(Endian, WriteBitAligned) { 73 // This test ensures that signed right shift of 0xffffaa is masked 74 // properly. 75 unsigned char bigval[8] = {0x00}; 76 endian::writeAtBitAlignment<int32_t, big, unaligned>(bigval, (int)0xffffaaaa, 77 4); 78 EXPECT_EQ(bigval[0], 0xff); 79 EXPECT_EQ(bigval[1], 0xfa); 80 EXPECT_EQ(bigval[2], 0xaa); 81 EXPECT_EQ(bigval[3], 0xa0); 82 EXPECT_EQ(bigval[4], 0x00); 83 EXPECT_EQ(bigval[5], 0x00); 84 EXPECT_EQ(bigval[6], 0x00); 85 EXPECT_EQ(bigval[7], 0x0f); 86 87 unsigned char littleval[8] = {0x00}; 88 endian::writeAtBitAlignment<int32_t, little, unaligned>(littleval, 89 (int)0xffffaaaa, 4); 90 EXPECT_EQ(littleval[0], 0xa0); 91 EXPECT_EQ(littleval[1], 0xaa); 92 EXPECT_EQ(littleval[2], 0xfa); 93 EXPECT_EQ(littleval[3], 0xff); 94 EXPECT_EQ(littleval[4], 0x0f); 95 EXPECT_EQ(littleval[5], 0x00); 96 EXPECT_EQ(littleval[6], 0x00); 97 EXPECT_EQ(littleval[7], 0x00); 98 99 // This test makes sure 1<<31 doesn't overflow. 100 // Test to make sure left shift of start bit doesn't overflow. 101 unsigned char bigval2[8] = {0x00}; 102 endian::writeAtBitAlignment<int32_t, big, unaligned>(bigval2, (int)0xffffffff, 103 1); 104 EXPECT_EQ(bigval2[0], 0xff); 105 EXPECT_EQ(bigval2[1], 0xff); 106 EXPECT_EQ(bigval2[2], 0xff); 107 EXPECT_EQ(bigval2[3], 0xfe); 108 EXPECT_EQ(bigval2[4], 0x00); 109 EXPECT_EQ(bigval2[5], 0x00); 110 EXPECT_EQ(bigval2[6], 0x00); 111 EXPECT_EQ(bigval2[7], 0x01); 112 113 unsigned char littleval2[8] = {0x00}; 114 endian::writeAtBitAlignment<int32_t, little, unaligned>(littleval2, 115 (int)0xffffffff, 1); 116 EXPECT_EQ(littleval2[0], 0xfe); 117 EXPECT_EQ(littleval2[1], 0xff); 118 EXPECT_EQ(littleval2[2], 0xff); 119 EXPECT_EQ(littleval2[3], 0xff); 120 EXPECT_EQ(littleval2[4], 0x01); 121 EXPECT_EQ(littleval2[5], 0x00); 122 EXPECT_EQ(littleval2[6], 0x00); 123 EXPECT_EQ(littleval2[7], 0x00); 124 125 // Test to make sure 64-bit int doesn't overflow. 126 unsigned char bigval64[16] = {0x00}; 127 endian::writeAtBitAlignment<int64_t, big, unaligned>( 128 bigval64, (int64_t)0xffffffffffffffff, 1); 129 EXPECT_EQ(bigval64[0], 0xff); 130 EXPECT_EQ(bigval64[1], 0xff); 131 EXPECT_EQ(bigval64[2], 0xff); 132 EXPECT_EQ(bigval64[3], 0xff); 133 EXPECT_EQ(bigval64[4], 0xff); 134 EXPECT_EQ(bigval64[5], 0xff); 135 EXPECT_EQ(bigval64[6], 0xff); 136 EXPECT_EQ(bigval64[7], 0xfe); 137 EXPECT_EQ(bigval64[8], 0x00); 138 EXPECT_EQ(bigval64[9], 0x00); 139 EXPECT_EQ(bigval64[10], 0x00); 140 EXPECT_EQ(bigval64[11], 0x00); 141 EXPECT_EQ(bigval64[12], 0x00); 142 EXPECT_EQ(bigval64[13], 0x00); 143 EXPECT_EQ(bigval64[14], 0x00); 144 EXPECT_EQ(bigval64[15], 0x01); 145 146 unsigned char littleval64[16] = {0x00}; 147 endian::writeAtBitAlignment<int64_t, little, unaligned>( 148 littleval64, (int64_t)0xffffffffffffffff, 1); 149 EXPECT_EQ(littleval64[0], 0xfe); 150 EXPECT_EQ(littleval64[1], 0xff); 151 EXPECT_EQ(littleval64[2], 0xff); 152 EXPECT_EQ(littleval64[3], 0xff); 153 EXPECT_EQ(littleval64[4], 0xff); 154 EXPECT_EQ(littleval64[5], 0xff); 155 EXPECT_EQ(littleval64[6], 0xff); 156 EXPECT_EQ(littleval64[7], 0xff); 157 EXPECT_EQ(littleval64[8], 0x01); 158 EXPECT_EQ(littleval64[9], 0x00); 159 EXPECT_EQ(littleval64[10], 0x00); 160 EXPECT_EQ(littleval64[11], 0x00); 161 EXPECT_EQ(littleval64[12], 0x00); 162 EXPECT_EQ(littleval64[13], 0x00); 163 EXPECT_EQ(littleval64[14], 0x00); 164 EXPECT_EQ(littleval64[15], 0x00); 165 } 166 167 TEST(Endian, Write) { 168 unsigned char data[5]; 169 endian::write<int32_t, big, unaligned>(data, -1362446643); 170 EXPECT_EQ(data[0], 0xAE); 171 EXPECT_EQ(data[1], 0xCA); 172 EXPECT_EQ(data[2], 0xB6); 173 EXPECT_EQ(data[3], 0xCD); 174 endian::write<int32_t, big, unaligned>(data + 1, -1362446643); 175 EXPECT_EQ(data[1], 0xAE); 176 EXPECT_EQ(data[2], 0xCA); 177 EXPECT_EQ(data[3], 0xB6); 178 EXPECT_EQ(data[4], 0xCD); 179 180 endian::write<int32_t, little, unaligned>(data, -1362446643); 181 EXPECT_EQ(data[0], 0xCD); 182 EXPECT_EQ(data[1], 0xB6); 183 EXPECT_EQ(data[2], 0xCA); 184 EXPECT_EQ(data[3], 0xAE); 185 endian::write<int32_t, little, unaligned>(data + 1, -1362446643); 186 EXPECT_EQ(data[1], 0xCD); 187 EXPECT_EQ(data[2], 0xB6); 188 EXPECT_EQ(data[3], 0xCA); 189 EXPECT_EQ(data[4], 0xAE); 190 } 191 192 TEST(Endian, PackedEndianSpecificIntegral) { 193 // These are 5 bytes so we can be sure at least one of the reads is unaligned. 194 unsigned char big[] = {0x00, 0x01, 0x02, 0x03, 0x04}; 195 unsigned char little[] = {0x00, 0x04, 0x03, 0x02, 0x01}; 196 big32_t *big_val = 197 reinterpret_cast<big32_t *>(big + 1); 198 little32_t *little_val = 199 reinterpret_cast<little32_t *>(little + 1); 200 201 EXPECT_EQ(*big_val, *little_val); 202 } 203 204 } // end anon namespace 205
