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1 //===- unittests/Support/EndianTest.cpp - Endian.h tests ------------------===//
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2 //
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147
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3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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4 // See https://llvm.org/LICENSE.txt for license information.
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5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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6 //
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7 //===----------------------------------------------------------------------===//
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8
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9 #include "llvm/Support/Endian.h"
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10 #include "llvm/Support/DataTypes.h"
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11 #include "gtest/gtest.h"
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12 #include <cstdlib>
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13 #include <ctime>
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14 using namespace llvm;
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15 using namespace support;
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16
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17 #undef max
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18
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19 namespace {
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20
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21 TEST(Endian, Read) {
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22 // These are 5 bytes so we can be sure at least one of the reads is unaligned.
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23 unsigned char bigval[] = {0x00, 0x01, 0x02, 0x03, 0x04};
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24 unsigned char littleval[] = {0x00, 0x04, 0x03, 0x02, 0x01};
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25 int32_t BigAsHost = 0x00010203;
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26 EXPECT_EQ(BigAsHost, (endian::read<int32_t, big, unaligned>(bigval)));
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27 int32_t LittleAsHost = 0x02030400;
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28 EXPECT_EQ(LittleAsHost,(endian::read<int32_t, little, unaligned>(littleval)));
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29
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30 EXPECT_EQ((endian::read<int32_t, big, unaligned>(bigval + 1)),
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31 (endian::read<int32_t, little, unaligned>(littleval + 1)));
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32 }
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33
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95
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34 TEST(Endian, ReadBitAligned) {
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35 // Simple test to make sure we properly pull out the 0x0 word.
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36 unsigned char littleval[] = {0x3f, 0x00, 0x00, 0x00, 0xc0, 0xff, 0xff, 0xff};
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37 unsigned char bigval[] = {0x00, 0x00, 0x00, 0x3f, 0xff, 0xff, 0xff, 0xc0};
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38 EXPECT_EQ(
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39 (endian::readAtBitAlignment<int, little, unaligned>(&littleval[0], 6)),
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40 0x0);
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41 EXPECT_EQ((endian::readAtBitAlignment<int, big, unaligned>(&bigval[0], 6)),
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42 0x0);
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43 // Test to make sure that signed right shift of 0xf0000000 is masked
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44 // properly.
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45 unsigned char littleval2[] = {0x00, 0x00, 0x00, 0xf0, 0x00, 0x00, 0x00, 0x00};
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46 unsigned char bigval2[] = {0xf0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
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47 EXPECT_EQ(
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48 (endian::readAtBitAlignment<int, little, unaligned>(&littleval2[0], 4)),
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49 0x0f000000);
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50 EXPECT_EQ((endian::readAtBitAlignment<int, big, unaligned>(&bigval2[0], 4)),
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51 0x0f000000);
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52 // Test to make sure left shift of start bit doesn't overflow.
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53 EXPECT_EQ(
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54 (endian::readAtBitAlignment<int, little, unaligned>(&littleval2[0], 1)),
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55 0x78000000);
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56 EXPECT_EQ((endian::readAtBitAlignment<int, big, unaligned>(&bigval2[0], 1)),
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57 0x78000000);
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58 // Test to make sure 64-bit int doesn't overflow.
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59 unsigned char littleval3[] = {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xf0,
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60 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
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61 unsigned char bigval3[] = {0xf0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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62 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
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63 EXPECT_EQ((endian::readAtBitAlignment<int64_t, little, unaligned>(
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64 &littleval3[0], 4)),
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65 0x0f00000000000000);
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66 EXPECT_EQ(
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67 (endian::readAtBitAlignment<int64_t, big, unaligned>(&bigval3[0], 4)),
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68 0x0f00000000000000);
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69 }
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70
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71 TEST(Endian, WriteBitAligned) {
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72 // This test ensures that signed right shift of 0xffffaa is masked
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73 // properly.
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74 unsigned char bigval[8] = {0x00};
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75 endian::writeAtBitAlignment<int32_t, big, unaligned>(bigval, (int)0xffffaaaa,
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76 4);
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77 EXPECT_EQ(bigval[0], 0xff);
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78 EXPECT_EQ(bigval[1], 0xfa);
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79 EXPECT_EQ(bigval[2], 0xaa);
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80 EXPECT_EQ(bigval[3], 0xa0);
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81 EXPECT_EQ(bigval[4], 0x00);
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82 EXPECT_EQ(bigval[5], 0x00);
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83 EXPECT_EQ(bigval[6], 0x00);
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84 EXPECT_EQ(bigval[7], 0x0f);
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85
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86 unsigned char littleval[8] = {0x00};
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87 endian::writeAtBitAlignment<int32_t, little, unaligned>(littleval,
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88 (int)0xffffaaaa, 4);
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89 EXPECT_EQ(littleval[0], 0xa0);
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90 EXPECT_EQ(littleval[1], 0xaa);
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91 EXPECT_EQ(littleval[2], 0xfa);
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92 EXPECT_EQ(littleval[3], 0xff);
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93 EXPECT_EQ(littleval[4], 0x0f);
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94 EXPECT_EQ(littleval[5], 0x00);
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95 EXPECT_EQ(littleval[6], 0x00);
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96 EXPECT_EQ(littleval[7], 0x00);
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97
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98 // This test makes sure 1<<31 doesn't overflow.
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99 // Test to make sure left shift of start bit doesn't overflow.
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100 unsigned char bigval2[8] = {0x00};
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101 endian::writeAtBitAlignment<int32_t, big, unaligned>(bigval2, (int)0xffffffff,
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102 1);
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103 EXPECT_EQ(bigval2[0], 0xff);
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104 EXPECT_EQ(bigval2[1], 0xff);
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105 EXPECT_EQ(bigval2[2], 0xff);
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106 EXPECT_EQ(bigval2[3], 0xfe);
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107 EXPECT_EQ(bigval2[4], 0x00);
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108 EXPECT_EQ(bigval2[5], 0x00);
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109 EXPECT_EQ(bigval2[6], 0x00);
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110 EXPECT_EQ(bigval2[7], 0x01);
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111
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112 unsigned char littleval2[8] = {0x00};
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113 endian::writeAtBitAlignment<int32_t, little, unaligned>(littleval2,
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114 (int)0xffffffff, 1);
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115 EXPECT_EQ(littleval2[0], 0xfe);
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116 EXPECT_EQ(littleval2[1], 0xff);
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117 EXPECT_EQ(littleval2[2], 0xff);
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118 EXPECT_EQ(littleval2[3], 0xff);
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119 EXPECT_EQ(littleval2[4], 0x01);
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120 EXPECT_EQ(littleval2[5], 0x00);
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121 EXPECT_EQ(littleval2[6], 0x00);
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122 EXPECT_EQ(littleval2[7], 0x00);
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123
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124 // Test to make sure 64-bit int doesn't overflow.
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125 unsigned char bigval64[16] = {0x00};
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126 endian::writeAtBitAlignment<int64_t, big, unaligned>(
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127 bigval64, (int64_t)0xffffffffffffffff, 1);
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128 EXPECT_EQ(bigval64[0], 0xff);
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129 EXPECT_EQ(bigval64[1], 0xff);
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130 EXPECT_EQ(bigval64[2], 0xff);
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131 EXPECT_EQ(bigval64[3], 0xff);
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132 EXPECT_EQ(bigval64[4], 0xff);
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133 EXPECT_EQ(bigval64[5], 0xff);
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134 EXPECT_EQ(bigval64[6], 0xff);
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135 EXPECT_EQ(bigval64[7], 0xfe);
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136 EXPECT_EQ(bigval64[8], 0x00);
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137 EXPECT_EQ(bigval64[9], 0x00);
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138 EXPECT_EQ(bigval64[10], 0x00);
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139 EXPECT_EQ(bigval64[11], 0x00);
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140 EXPECT_EQ(bigval64[12], 0x00);
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141 EXPECT_EQ(bigval64[13], 0x00);
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142 EXPECT_EQ(bigval64[14], 0x00);
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143 EXPECT_EQ(bigval64[15], 0x01);
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144
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145 unsigned char littleval64[16] = {0x00};
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146 endian::writeAtBitAlignment<int64_t, little, unaligned>(
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147 littleval64, (int64_t)0xffffffffffffffff, 1);
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148 EXPECT_EQ(littleval64[0], 0xfe);
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149 EXPECT_EQ(littleval64[1], 0xff);
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150 EXPECT_EQ(littleval64[2], 0xff);
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151 EXPECT_EQ(littleval64[3], 0xff);
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152 EXPECT_EQ(littleval64[4], 0xff);
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153 EXPECT_EQ(littleval64[5], 0xff);
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154 EXPECT_EQ(littleval64[6], 0xff);
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155 EXPECT_EQ(littleval64[7], 0xff);
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156 EXPECT_EQ(littleval64[8], 0x01);
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157 EXPECT_EQ(littleval64[9], 0x00);
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158 EXPECT_EQ(littleval64[10], 0x00);
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159 EXPECT_EQ(littleval64[11], 0x00);
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160 EXPECT_EQ(littleval64[12], 0x00);
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161 EXPECT_EQ(littleval64[13], 0x00);
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162 EXPECT_EQ(littleval64[14], 0x00);
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163 EXPECT_EQ(littleval64[15], 0x00);
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164 }
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165
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166 TEST(Endian, Write) {
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167 unsigned char data[5];
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168 endian::write<int32_t, big, unaligned>(data, -1362446643);
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169 EXPECT_EQ(data[0], 0xAE);
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170 EXPECT_EQ(data[1], 0xCA);
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171 EXPECT_EQ(data[2], 0xB6);
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172 EXPECT_EQ(data[3], 0xCD);
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173 endian::write<int32_t, big, unaligned>(data + 1, -1362446643);
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174 EXPECT_EQ(data[1], 0xAE);
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175 EXPECT_EQ(data[2], 0xCA);
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176 EXPECT_EQ(data[3], 0xB6);
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177 EXPECT_EQ(data[4], 0xCD);
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178
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179 endian::write<int32_t, little, unaligned>(data, -1362446643);
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180 EXPECT_EQ(data[0], 0xCD);
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181 EXPECT_EQ(data[1], 0xB6);
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182 EXPECT_EQ(data[2], 0xCA);
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183 EXPECT_EQ(data[3], 0xAE);
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184 endian::write<int32_t, little, unaligned>(data + 1, -1362446643);
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185 EXPECT_EQ(data[1], 0xCD);
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186 EXPECT_EQ(data[2], 0xB6);
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187 EXPECT_EQ(data[3], 0xCA);
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188 EXPECT_EQ(data[4], 0xAE);
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189 }
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190
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191 TEST(Endian, PackedEndianSpecificIntegral) {
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192 // These are 5 bytes so we can be sure at least one of the reads is unaligned.
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193 unsigned char big[] = {0x00, 0x01, 0x02, 0x03, 0x04};
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194 unsigned char little[] = {0x00, 0x04, 0x03, 0x02, 0x01};
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195 big32_t *big_val =
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196 reinterpret_cast<big32_t *>(big + 1);
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197 little32_t *little_val =
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198 reinterpret_cast<little32_t *>(little + 1);
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199
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200 EXPECT_EQ(*big_val, *little_val);
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201 }
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202
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147
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203 TEST(Endian, PacketEndianSpecificIntegralAsEnum) {
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204 enum class Test : uint16_t { ONETWO = 0x0102, TWOONE = 0x0201 };
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205 unsigned char bytes[] = {0x01, 0x02};
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206 using LittleTest = little_t<Test>;
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207 using BigTest = big_t<Test>;
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208 EXPECT_EQ(Test::TWOONE, *reinterpret_cast<LittleTest *>(bytes));
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209 EXPECT_EQ(Test::ONETWO, *reinterpret_cast<BigTest *>(bytes));
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210 }
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211
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212 } // end anon namespace
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